Google Git
Sign in
cobalt / cobalt / c73ce7d5dfce7ae20bcc30efc5f220e0fbac12b1 / . / src / third_party / mozjs-45 / js / src / vm / Debugger.cpp
blob: 5b00d8e225d4875f95063eb055c46cfc61d1aa5a [file] [log] [blame]
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "vm/Debugger-inl.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/TypeTraits.h"
#include "jscntxt.h"
#include "jscompartment.h"
#include "jsfriendapi.h"
#include "jshashutil.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jswrapper.h"
#include "frontend/BytecodeCompiler.h"
#include "gc/Marking.h"
#include "jit/BaselineDebugModeOSR.h"
#include "jit/BaselineJIT.h"
#include "jit/JSONSpewer.h"
#include "jit/MIRGraph.h"
#include "js/GCAPI.h"
#include "js/UbiNodeBreadthFirst.h"
#include "js/Vector.h"
#include "vm/ArgumentsObject.h"
#include "vm/DebuggerMemory.h"
#include "vm/SPSProfiler.h"
#include "vm/TraceLogging.h"
#include "vm/WrapperObject.h"
#include "jsgcinlines.h"
#include "jsobjinlines.h"
#include "jsopcodeinlines.h"
#include "jsscriptinlines.h"
#include "vm/NativeObject-inl.h"
#include "vm/Stack-inl.h"
using namespace js;
using JS::dbg::AutoEntryMonitor;
using JS::dbg::Builder;
using js::frontend::IsIdentifier;
using mozilla::ArrayLength;
using mozilla::DebugOnly;
using mozilla::MakeScopeExit;
using mozilla::Maybe;
using mozilla::UniquePtr;
/*** Forward declarations ************************************************************************/
extern const Class DebuggerFrame_class;
enum {
JSSLOT_DEBUGFRAME_OWNER,
JSSLOT_DEBUGFRAME_ARGUMENTS,
JSSLOT_DEBUGFRAME_ONSTEP_HANDLER,
JSSLOT_DEBUGFRAME_ONPOP_HANDLER,
JSSLOT_DEBUGFRAME_COUNT
};
extern const Class DebuggerArguments_class;
enum {
JSSLOT_DEBUGARGUMENTS_FRAME,
JSSLOT_DEBUGARGUMENTS_COUNT
};
extern const Class DebuggerEnv_class;
enum {
JSSLOT_DEBUGENV_OWNER,
JSSLOT_DEBUGENV_COUNT
};
extern const Class DebuggerObject_class;
enum {
JSSLOT_DEBUGOBJECT_OWNER,
JSSLOT_DEBUGOBJECT_COUNT
};
extern const Class DebuggerScript_class;
enum {
JSSLOT_DEBUGSCRIPT_OWNER,
JSSLOT_DEBUGSCRIPT_COUNT
};
extern const Class DebuggerSource_class;
enum {
JSSLOT_DEBUGSOURCE_OWNER,
JSSLOT_DEBUGSOURCE_TEXT,
JSSLOT_DEBUGSOURCE_COUNT
};
void DebuggerObject_trace(JSTracer* trc, JSObject* obj);
void DebuggerEnv_trace(JSTracer* trc, JSObject* obj);
void DebuggerScript_trace(JSTracer* trc, JSObject* obj);
void DebuggerSource_trace(JSTracer* trc, JSObject* obj);
/*** Utils ***************************************************************************************/
static inline bool
EnsureFunctionHasScript(JSContext* cx, HandleFunction fun)
{
if (fun->isInterpretedLazy()) {
AutoCompartment ac(cx, fun);
return !!fun->getOrCreateScript(cx);
}
return true;
}
static inline JSScript*
GetOrCreateFunctionScript(JSContext* cx, HandleFunction fun)
{
MOZ_ASSERT(fun->isInterpreted());
if (!EnsureFunctionHasScript(cx, fun))
return nullptr;
return fun->nonLazyScript();
}
static bool
ValueToIdentifier(JSContext* cx, HandleValue v, MutableHandleId id)
{
if (!ValueToId<CanGC>(cx, v, id))
return false;
if (!JSID_IS_ATOM(id) || !IsIdentifier(JSID_TO_ATOM(id))) {
RootedValue val(cx, v);
ReportValueErrorFlags(cx, JSREPORT_ERROR, JSMSG_UNEXPECTED_TYPE,
JSDVG_SEARCH_STACK, val, nullptr, "not an identifier",
nullptr);
return false;
}
return true;
}
/*
* A range of all the Debugger.Frame objects for a particular AbstractFramePtr.
*
* FIXME This checks only current debuggers, so it relies on a hack in
* Debugger::removeDebuggeeGlobal to make sure only current debuggers
* have Frame objects with .live === true.
*/
class Debugger::FrameRange
{
AbstractFramePtr frame;
/* The debuggers in |fp|'s compartment, or nullptr if there are none. */
GlobalObject::DebuggerVector* debuggers;
/*
* The index of the front Debugger.Frame's debugger in debuggers.
* nextDebugger < debuggerCount if and only if the range is not empty.
*/
size_t debuggerCount, nextDebugger;
/*
* If the range is not empty, this is front Debugger.Frame's entry in its
* debugger's frame table.
*/
FrameMap::Ptr entry;
public:
/*
* Return a range containing all Debugger.Frame instances referring to
* |fp|. |global| is |fp|'s global object; if nullptr or omitted, we
* compute it ourselves from |fp|.
*
* We keep an index into the compartment's debugger list, and a
* FrameMap::Ptr into the current debugger's frame map. Thus, if the set of
* debuggers in |fp|'s compartment changes, this range becomes invalid.
* Similarly, if stack frames are added to or removed from frontDebugger(),
* then the range's front is invalid until popFront is called.
*/
explicit FrameRange(AbstractFramePtr frame, GlobalObject* global = nullptr)
: frame(frame)
{
nextDebugger = 0;
/* Find our global, if we were not given one. */
if (!global)
global = &frame.script()->global();
/* The frame and global must match. */
MOZ_ASSERT(&frame.script()->global() == global);
/* Find the list of debuggers we'll iterate over. There may be none. */
debuggers = global->getDebuggers();
if (debuggers) {
debuggerCount = debuggers->length();
findNext();
} else {
debuggerCount = 0;
}
}
bool empty() const {
return nextDebugger >= debuggerCount;
}
NativeObject* frontFrame() const {
MOZ_ASSERT(!empty());
return entry->value();
}
Debugger* frontDebugger() const {
MOZ_ASSERT(!empty());
return (*debuggers)[nextDebugger];
}
/*
* Delete the front frame from its Debugger's frame map. After this call,
* the range's front is invalid until popFront is called.
*/
void removeFrontFrame() const {
MOZ_ASSERT(!empty());
frontDebugger()->frames.remove(entry);
}
void popFront() {
MOZ_ASSERT(!empty());
nextDebugger++;
findNext();
}
private:
/*
* Either make this range refer to the first appropriate Debugger.Frame at
* or after nextDebugger, or make it empty.
*/
void findNext() {
while (!empty()) {
Debugger* dbg = (*debuggers)[nextDebugger];
entry = dbg->frames.lookup(frame);
if (entry)
break;
nextDebugger++;
}
}
};
/*** Breakpoints *********************************************************************************/
BreakpointSite::BreakpointSite(JSScript* script, jsbytecode* pc)
: script(script), pc(pc), enabledCount(0)
{
MOZ_ASSERT(!script->hasBreakpointsAt(pc));
JS_INIT_CLIST(&breakpoints);
}
void
BreakpointSite::recompile(FreeOp* fop)
{
if (script->hasBaselineScript())
script->baselineScript()->toggleDebugTraps(script, pc);
}
void
BreakpointSite::inc(FreeOp* fop)
{
enabledCount++;
if (enabledCount == 1)
recompile(fop);
}
void
BreakpointSite::dec(FreeOp* fop)
{
MOZ_ASSERT(enabledCount > 0);
enabledCount--;
if (enabledCount == 0)
recompile(fop);
}
void
BreakpointSite::destroyIfEmpty(FreeOp* fop)
{
if (JS_CLIST_IS_EMPTY(&breakpoints))
script->destroyBreakpointSite(fop, pc);
}
Breakpoint*
BreakpointSite::firstBreakpoint() const
{
if (JS_CLIST_IS_EMPTY(&breakpoints))
return nullptr;
return Breakpoint::fromSiteLinks(JS_NEXT_LINK(&breakpoints));
}
bool
BreakpointSite::hasBreakpoint(Breakpoint* bp)
{
for (Breakpoint* p = firstBreakpoint(); p; p = p->nextInSite())
if (p == bp)
return true;
return false;
}
Breakpoint::Breakpoint(Debugger* debugger, BreakpointSite* site, JSObject* handler)
: debugger(debugger), site(site), handler(handler)
{
MOZ_ASSERT(handler->compartment() == debugger->object->compartment());
JS_APPEND_LINK(&debuggerLinks, &debugger->breakpoints);
JS_APPEND_LINK(&siteLinks, &site->breakpoints);
}
Breakpoint*
Breakpoint::fromDebuggerLinks(JSCList* links)
{
return (Breakpoint*) ((unsigned char*) links - offsetof(Breakpoint, debuggerLinks));
}
Breakpoint*
Breakpoint::fromSiteLinks(JSCList* links)
{
return (Breakpoint*) ((unsigned char*) links - offsetof(Breakpoint, siteLinks));
}
void
Breakpoint::destroy(FreeOp* fop)
{
if (debugger->enabled)
site->dec(fop);
JS_REMOVE_LINK(&debuggerLinks);
JS_REMOVE_LINK(&siteLinks);
site->destroyIfEmpty(fop);
fop->delete_(this);
}
Breakpoint*
Breakpoint::nextInDebugger()
{
JSCList* link = JS_NEXT_LINK(&debuggerLinks);
return (link == &debugger->breakpoints) ? nullptr : fromDebuggerLinks(link);
}
Breakpoint*
Breakpoint::nextInSite()
{
JSCList* link = JS_NEXT_LINK(&siteLinks);
return (link == &site->breakpoints) ? nullptr : fromSiteLinks(link);
}
/*** Debugger hook dispatch **********************************************************************/
Debugger::Debugger(JSContext* cx, NativeObject* dbg)
: object(dbg),
uncaughtExceptionHook(nullptr),
enabled(true),
allowUnobservedAsmJS(false),
collectCoverageInfo(false),
observedGCs(cx),
tenurePromotionsLog(cx),
trackingTenurePromotions(false),
maxTenurePromotionsLogLength(DEFAULT_MAX_LOG_LENGTH),
tenurePromotionsLogOverflowed(false),
allocationsLog(cx),
trackingAllocationSites(false),
allocationSamplingProbability(1.0),
maxAllocationsLogLength(DEFAULT_MAX_LOG_LENGTH),
allocationsLogOverflowed(false),
frames(cx->runtime()),
scripts(cx),
sources(cx),
objects(cx),
environments(cx),
#ifdef NIGHTLY_BUILD
traceLoggerLastDrainedSize(0),
traceLoggerLastDrainedIteration(0),
#endif
traceLoggerScriptedCallsLastDrainedSize(0),
traceLoggerScriptedCallsLastDrainedIteration(0)
{
assertSameCompartment(cx, dbg);
cx->runtime()->debuggerList.insertBack(this);
JS_INIT_CLIST(&breakpoints);
JS_INIT_CLIST(&onNewGlobalObjectWatchersLink);
}
Debugger::~Debugger()
{
MOZ_ASSERT_IF(debuggees.initialized(), debuggees.empty());
allocationsLog.clear();
tenurePromotionsLog.clear();
/*
* Since the inactive state for this link is a singleton cycle, it's always
* safe to apply JS_REMOVE_LINK to it, regardless of whether we're in the list or not.
*
* We don't have to worry about locking here since Debugger is not
* background finalized.
*/
JS_REMOVE_LINK(&onNewGlobalObjectWatchersLink);
}
bool
Debugger::init(JSContext* cx)
{
bool ok = debuggees.init() &&
debuggeeZones.init() &&
frames.init() &&
scripts.init() &&
sources.init() &&
objects.init() &&
observedGCs.init() &&
environments.init();
if (!ok)
ReportOutOfMemory(cx);
return ok;
}
JS_STATIC_ASSERT(unsigned(JSSLOT_DEBUGFRAME_OWNER) == unsigned(JSSLOT_DEBUGSCRIPT_OWNER));
JS_STATIC_ASSERT(unsigned(JSSLOT_DEBUGFRAME_OWNER) == unsigned(JSSLOT_DEBUGSOURCE_OWNER));
JS_STATIC_ASSERT(unsigned(JSSLOT_DEBUGFRAME_OWNER) == unsigned(JSSLOT_DEBUGOBJECT_OWNER));
JS_STATIC_ASSERT(unsigned(JSSLOT_DEBUGFRAME_OWNER) == unsigned(JSSLOT_DEBUGENV_OWNER));
/* static */ Debugger*
Debugger::fromChildJSObject(JSObject* obj)
{
MOZ_ASSERT(obj->getClass() == &DebuggerFrame_class ||
obj->getClass() == &DebuggerScript_class ||
obj->getClass() == &DebuggerSource_class ||
obj->getClass() == &DebuggerObject_class ||
obj->getClass() == &DebuggerEnv_class);
JSObject* dbgobj = &obj->as<NativeObject>().getReservedSlot(JSSLOT_DEBUGOBJECT_OWNER).toObject();
return fromJSObject(dbgobj);
}
bool
Debugger::hasMemory() const
{
return object->getReservedSlot(JSSLOT_DEBUG_MEMORY_INSTANCE).isObject();
}
DebuggerMemory&
Debugger::memory() const
{
MOZ_ASSERT(hasMemory());
return object->getReservedSlot(JSSLOT_DEBUG_MEMORY_INSTANCE).toObject().as<DebuggerMemory>();
}
bool
Debugger::getScriptFrameWithIter(JSContext* cx, AbstractFramePtr frame,
const ScriptFrameIter* maybeIter, MutableHandleValue vp)
{
MOZ_ASSERT_IF(maybeIter, maybeIter->abstractFramePtr() == frame);
MOZ_ASSERT(!frame.script()->selfHosted());
FrameMap::AddPtr p = frames.lookupForAdd(frame);
if (!p) {
/* Create and populate the Debugger.Frame object. */
RootedObject proto(cx, &object->getReservedSlot(JSSLOT_DEBUG_FRAME_PROTO).toObject());
RootedNativeObject frameobj(cx, NewNativeObjectWithGivenProto(cx, &DebuggerFrame_class,
proto));
if (!frameobj)
return false;
// Eagerly copy ScriptFrameIter data if we've already walked the
// stack.
if (maybeIter) {
AbstractFramePtr data = maybeIter->copyDataAsAbstractFramePtr();
if (!data)
return false;
frameobj->setPrivate(data.raw());
} else {
frameobj->setPrivate(frame.raw());
}
frameobj->setReservedSlot(JSSLOT_DEBUGFRAME_OWNER, ObjectValue(*object));
if (!ensureExecutionObservabilityOfFrame(cx, frame))
return false;
if (!frames.add(p, frame, frameobj)) {
ReportOutOfMemory(cx);
return false;
}
}
vp.setObject(*p->value());
return true;
}
/* static */ bool
Debugger::hasLiveHook(GlobalObject* global, Hook which)
{
if (GlobalObject::DebuggerVector* debuggers = global->getDebuggers()) {
for (Debugger** p = debuggers->begin(); p != debuggers->end(); p++) {
Debugger* dbg = *p;
if (dbg->enabled && dbg->getHook(which))
return true;
}
}
return false;
}
JSObject*
Debugger::getHook(Hook hook) const
{
MOZ_ASSERT(hook >= 0 && hook < HookCount);
const Value& v = object->getReservedSlot(JSSLOT_DEBUG_HOOK_START + hook);
return v.isUndefined() ? nullptr : &v.toObject();
}
bool
Debugger::hasAnyLiveHooks() const
{
if (!enabled)
return false;
if (getHook(OnDebuggerStatement) ||
getHook(OnExceptionUnwind) ||
getHook(OnNewScript) ||
getHook(OnEnterFrame))
{
return true;
}
/* If any breakpoints are in live scripts, return true. */
for (Breakpoint* bp = firstBreakpoint(); bp; bp = bp->nextInDebugger()) {
if (IsMarkedUnbarriered(&bp->site->script))
return true;
}
for (FrameMap::Range r = frames.all(); !r.empty(); r.popFront()) {
NativeObject* frameObj = r.front().value();
if (!frameObj->getReservedSlot(JSSLOT_DEBUGFRAME_ONSTEP_HANDLER).isUndefined() ||
!frameObj->getReservedSlot(JSSLOT_DEBUGFRAME_ONPOP_HANDLER).isUndefined())
return true;
}
return false;
}
/* static */ JSTrapStatus
Debugger::slowPathOnEnterFrame(JSContext* cx, AbstractFramePtr frame)
{
RootedValue rval(cx);
JSTrapStatus status = dispatchHook(
cx,
[frame](Debugger* dbg) -> bool {
return dbg->observesFrame(frame) && dbg->observesEnterFrame();
},
[&](Debugger* dbg) -> JSTrapStatus {
return dbg->fireEnterFrame(cx, frame, &rval);
});
switch (status) {
case JSTRAP_CONTINUE:
break;
case JSTRAP_THROW:
cx->setPendingException(rval);
break;
case JSTRAP_ERROR:
cx->clearPendingException();
break;
case JSTRAP_RETURN:
frame.setReturnValue(rval);
break;
default:
MOZ_CRASH("bad Debugger::onEnterFrame JSTrapStatus value");
}
return status;
}
static void
DebuggerFrame_maybeDecrementFrameScriptStepModeCount(FreeOp* fop, AbstractFramePtr frame,
NativeObject* frameobj);
static void
DebuggerFrame_freeScriptFrameIterData(FreeOp* fop, JSObject* obj);
/*
* Handle leaving a frame with debuggers watching. |frameOk| indicates whether
* the frame is exiting normally or abruptly. Set |cx|'s exception and/or
* |cx->fp()|'s return value, and return a new success value.
*/
/* static */ bool
Debugger::slowPathOnLeaveFrame(JSContext* cx, AbstractFramePtr frame, bool frameOk)
{
Handle<GlobalObject*> global = cx->global();
// The onPop handler and associated clean up logic should not run multiple
// times on the same frame. If slowPathOnLeaveFrame has already been
// called, the frame will not be present in the Debugger frame maps.
FrameRange frameRange(frame, global);
if (frameRange.empty())
return frameOk;
auto frameMapsGuard = MakeScopeExit([&] {
// Clean up all Debugger.Frame instances. This call creates a fresh
// FrameRange, as one debugger's onPop handler could have caused another
// debugger to create its own Debugger.Frame instance.
removeFromFrameMapsAndClearBreakpointsIn(cx, frame);
});
/* Save the frame's completion value. */
JSTrapStatus status;
RootedValue value(cx);
Debugger::resultToCompletion(cx, frameOk, frame.returnValue(), &status, &value);
// This path can be hit via unwinding the stack due to over-recursion or
// OOM. In those cases, don't fire the frames' onPop handlers, because
// invoking JS will only trigger the same condition. See
// slowPathOnExceptionUnwind.
if (!cx->isThrowingOverRecursed() && !cx->isThrowingOutOfMemory()) {
/* Build a list of the recipients. */
AutoObjectVector frames(cx);
for (; !frameRange.empty(); frameRange.popFront()) {
if (!frames.append(frameRange.frontFrame())) {
cx->clearPendingException();
return false;
}
}
/* For each Debugger.Frame, fire its onPop handler, if any. */
for (JSObject** p = frames.begin(); p != frames.end(); p++) {
RootedNativeObject frameobj(cx, &(*p)->as<NativeObject>());
Debugger* dbg = Debugger::fromChildJSObject(frameobj);
if (dbg->enabled &&
!frameobj->getReservedSlot(JSSLOT_DEBUGFRAME_ONPOP_HANDLER).isUndefined()) {
RootedValue handler(cx, frameobj->getReservedSlot(JSSLOT_DEBUGFRAME_ONPOP_HANDLER));
Maybe<AutoCompartment> ac;
ac.emplace(cx, dbg->object);
RootedValue completion(cx);
if (!dbg->newCompletionValue(cx, status, value, &completion)) {
status = dbg->handleUncaughtException(ac, false);
break;
}
/* Call the onPop handler. */
RootedValue rval(cx);
bool hookOk = Invoke(cx, ObjectValue(*frameobj), handler, 1, completion.address(),
&rval);
RootedValue nextValue(cx);
JSTrapStatus nextStatus = dbg->parseResumptionValue(ac, hookOk, rval, &nextValue);
/*
* At this point, we are back in the debuggee compartment, and any error has
* been wrapped up as a completion value.
*/
MOZ_ASSERT(cx->compartment() == global->compartment());
MOZ_ASSERT(!cx->isExceptionPending());
/* JSTRAP_CONTINUE means "make no change". */
if (nextStatus != JSTRAP_CONTINUE) {
status = nextStatus;
value = nextValue;
}
}
}
}
/* Establish (status, value) as our resumption value. */
switch (status) {
case JSTRAP_RETURN:
frame.setReturnValue(value);
return true;
case JSTRAP_THROW:
cx->setPendingException(value);
return false;
case JSTRAP_ERROR:
MOZ_ASSERT(!cx->isExceptionPending());
return false;
default:
MOZ_CRASH("bad final trap status");
}
}
/* static */ JSTrapStatus
Debugger::slowPathOnDebuggerStatement(JSContext* cx, AbstractFramePtr frame)
{
RootedValue rval(cx);
JSTrapStatus status = dispatchHook(
cx,
[](Debugger* dbg) -> bool { return dbg->getHook(OnDebuggerStatement); },
[&](Debugger* dbg) -> JSTrapStatus {
return dbg->fireDebuggerStatement(cx, &rval);
});
switch (status) {
case JSTRAP_CONTINUE:
case JSTRAP_ERROR:
break;
case JSTRAP_RETURN:
frame.setReturnValue(rval);
break;
case JSTRAP_THROW:
cx->setPendingException(rval);
break;
default:
MOZ_CRASH("Invalid onDebuggerStatement trap status");
}
return status;
}
/* static */ JSTrapStatus
Debugger::slowPathOnExceptionUnwind(JSContext* cx, AbstractFramePtr frame)
{
// Invoking more JS on an over-recursed stack or after OOM is only going
// to result in more of the same error.
if (cx->isThrowingOverRecursed() || cx->isThrowingOutOfMemory())
return JSTRAP_CONTINUE;
// The Debugger API mustn't muck with frames from self-hosted scripts.
if (frame.script()->selfHosted())
return JSTRAP_CONTINUE;
RootedValue rval(cx);
JSTrapStatus status = dispatchHook(
cx,
[](Debugger* dbg) -> bool { return dbg->getHook(OnExceptionUnwind); },
[&](Debugger* dbg) -> JSTrapStatus {
return dbg->fireExceptionUnwind(cx, &rval);
});
switch (status) {
case JSTRAP_CONTINUE:
break;
case JSTRAP_THROW:
cx->setPendingException(rval);
break;
case JSTRAP_ERROR:
cx->clearPendingException();
break;
case JSTRAP_RETURN:
cx->clearPendingException();
frame.setReturnValue(rval);
break;
default:
MOZ_CRASH("Invalid onExceptionUnwind trap status");
}
return status;
}
bool
Debugger::wrapEnvironment(JSContext* cx, Handle<Env*> env, MutableHandleValue rval)
{
if (!env) {
rval.setNull();
return true;
}
/*
* DebuggerEnv should only wrap a debug scope chain obtained (transitively)
* from GetDebugScopeFor(Frame|Function).
*/
MOZ_ASSERT(!IsSyntacticScope(env));
NativeObject* envobj;
DependentAddPtr<ObjectWeakMap> p(cx, environments, env);
if (p) {
envobj = &p->value()->as<NativeObject>();
} else {
/* Create a new Debugger.Environment for env. */
RootedObject proto(cx, &object->getReservedSlot(JSSLOT_DEBUG_ENV_PROTO).toObject());
envobj = NewNativeObjectWithGivenProto(cx, &DebuggerEnv_class, proto,
TenuredObject);
if (!envobj)
return false;
envobj->setPrivateGCThing(env);
envobj->setReservedSlot(JSSLOT_DEBUGENV_OWNER, ObjectValue(*object));
if (!p.add(cx, environments, env, envobj))
return false;
CrossCompartmentKey key(CrossCompartmentKey::DebuggerEnvironment, object, env);
if (!object->compartment()->putWrapper(cx, key, ObjectValue(*envobj))) {
environments.remove(env);
ReportOutOfMemory(cx);
return false;
}
}
rval.setObject(*envobj);
return true;
}
bool
Debugger::wrapDebuggeeValue(JSContext* cx, MutableHandleValue vp)
{
assertSameCompartment(cx, object.get());
if (vp.isObject()) {
RootedObject obj(cx, &vp.toObject());
if (obj->is<JSFunction>()) {
MOZ_ASSERT(!IsInternalFunctionObject(*obj));
RootedFunction fun(cx, &obj->as<JSFunction>());
if (!EnsureFunctionHasScript(cx, fun))
return false;
}
DependentAddPtr<ObjectWeakMap> p(cx, objects, obj);
if (p) {
vp.setObject(*p->value());
} else {
/* Create a new Debugger.Object for obj. */
RootedObject proto(cx, &object->getReservedSlot(JSSLOT_DEBUG_OBJECT_PROTO).toObject());
NativeObject* dobj =
NewNativeObjectWithGivenProto(cx, &DebuggerObject_class, proto,
TenuredObject);
if (!dobj)
return false;
dobj->setPrivateGCThing(obj);
dobj->setReservedSlot(JSSLOT_DEBUGOBJECT_OWNER, ObjectValue(*object));
if (!p.add(cx, objects, obj, dobj))
return false;
if (obj->compartment() != object->compartment()) {
CrossCompartmentKey key(CrossCompartmentKey::DebuggerObject, object, obj);
if (!object->compartment()->putWrapper(cx, key, ObjectValue(*dobj))) {
objects.remove(obj);
ReportOutOfMemory(cx);
return false;
}
}
vp.setObject(*dobj);
}
} else if (vp.isMagic()) {
RootedPlainObject optObj(cx, NewBuiltinClassInstance<PlainObject>(cx));
if (!optObj)
return false;
// We handle three sentinel values: missing arguments (overloading
// JS_OPTIMIZED_ARGUMENTS), optimized out slots (JS_OPTIMIZED_OUT),
// and uninitialized bindings (JS_UNINITIALIZED_LEXICAL).
//
// Other magic values should not have escaped.
PropertyName* name;
switch (vp.whyMagic()) {
case JS_OPTIMIZED_ARGUMENTS: name = cx->names().missingArguments; break;
case JS_OPTIMIZED_OUT: name = cx->names().optimizedOut; break;
case JS_UNINITIALIZED_LEXICAL: name = cx->names().uninitialized; break;
default: MOZ_CRASH("Unsupported magic value escaped to Debugger");
}
RootedValue trueVal(cx, BooleanValue(true));
if (!DefineProperty(cx, optObj, name, trueVal))
return false;
vp.setObject(*optObj);
} else if (!cx->compartment()->wrap(cx, vp)) {
vp.setUndefined();
return false;
}
return true;
}
bool
Debugger::unwrapDebuggeeObject(JSContext* cx, MutableHandleObject obj)
{
if (obj->getClass() != &DebuggerObject_class) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
"Debugger", "Debugger.Object", obj->getClass()->name);
return false;
}
NativeObject* ndobj = &obj->as<NativeObject>();
Value owner = ndobj->getReservedSlot(JSSLOT_DEBUGOBJECT_OWNER);
if (owner.isUndefined() || &owner.toObject() != object) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
owner.isUndefined()
? JSMSG_DEBUG_OBJECT_PROTO
: JSMSG_DEBUG_OBJECT_WRONG_OWNER);
return false;
}
obj.set(static_cast<JSObject*>(ndobj->getPrivate()));
return true;
}
bool
Debugger::unwrapDebuggeeValue(JSContext* cx, MutableHandleValue vp)
{
assertSameCompartment(cx, object.get(), vp);
if (vp.isObject()) {
RootedObject dobj(cx, &vp.toObject());
if (!unwrapDebuggeeObject(cx, &dobj))
return false;
vp.setObject(*dobj);
}
return true;
}
static bool
CheckArgCompartment(JSContext* cx, JSObject* obj, JSObject* arg,
const char* methodname, const char* propname)
{
if (arg->compartment() != obj->compartment()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_COMPARTMENT_MISMATCH,
methodname, propname);
return false;
}
return true;
}
static bool
CheckArgCompartment(JSContext* cx, JSObject* obj, HandleValue v,
const char* methodname, const char* propname)
{
if (v.isObject())
return CheckArgCompartment(cx, obj, &v.toObject(), methodname, propname);
return true;
}
bool
Debugger::unwrapPropertyDescriptor(JSContext* cx, HandleObject obj,
MutableHandle<PropertyDescriptor> desc)
{
if (desc.hasValue()) {
RootedValue value(cx, desc.value());
if (!unwrapDebuggeeValue(cx, &value) ||
!CheckArgCompartment(cx, obj, value, "defineProperty", "value"))
{
return false;
}
desc.setValue(value);
}
if (desc.hasGetterObject()) {
RootedObject get(cx, desc.getterObject());
if (get) {
if (!unwrapDebuggeeObject(cx, &get))
return false;
if (!CheckArgCompartment(cx, obj, get, "defineProperty", "get"))
return false;
}
desc.setGetterObject(get);
}
if (desc.hasSetterObject()) {
RootedObject set(cx, desc.setterObject());
if (set) {
if (!unwrapDebuggeeObject(cx, &set))
return false;
if (!CheckArgCompartment(cx, obj, set, "defineProperty", "set"))
return false;
}
desc.setSetterObject(set);
}
return true;
}
namespace {
class MOZ_STACK_CLASS ReportExceptionClosure : public ScriptEnvironmentPreparer::Closure
{
public:
explicit ReportExceptionClosure(RootedValue& exn)
: exn_(exn)
{
}
bool operator()(JSContext* cx) override
{
cx->setPendingException(exn_);
return false;
}
private:
RootedValue& exn_;
};
} // anonymous namespace
JSTrapStatus
Debugger::handleUncaughtExceptionHelper(Maybe<AutoCompartment>& ac,
MutableHandleValue* vp, bool callHook)
{
JSContext* cx = ac->context()->asJSContext();
if (cx->isExceptionPending()) {
if (callHook && uncaughtExceptionHook) {
RootedValue exc(cx);
if (!cx->getPendingException(&exc))
return JSTRAP_ERROR;
cx->clearPendingException();
RootedValue fval(cx, ObjectValue(*uncaughtExceptionHook));
RootedValue rv(cx);
if (Invoke(cx, ObjectValue(*object), fval, 1, exc.address(), &rv))
return vp ? parseResumptionValue(ac, true, rv, *vp, false) : JSTRAP_CONTINUE;
}
if (cx->isExceptionPending()) {
/*
* We want to report the pending exception, but we want to let the
* embedding handle it however it wants to. So pretend like we're
* starting a new script execution on our current compartment (which
* is the debugger compartment, so reported errors won't get
* reported to various onerror handlers in debuggees) and as part of
* that "execution" simply throw our exception so the embedding can
* deal.
*/
RootedValue exn(cx);
if (cx->getPendingException(&exn)) {
/*
* Clear the exception, because
* PrepareScriptEnvironmentAndInvoke will assert that we don't
* have one.
*/
cx->clearPendingException();
ReportExceptionClosure reportExn(exn);
PrepareScriptEnvironmentAndInvoke(cx, cx->global(), reportExn);
}
/*
* And if not, or if PrepareScriptEnvironmentAndInvoke somehow left
* an exception on cx (which it totally shouldn't do), just give
* up.
*/
cx->clearPendingException();
}
}
ac.reset();
return JSTRAP_ERROR;
}
JSTrapStatus
Debugger::handleUncaughtException(Maybe<AutoCompartment>& ac, MutableHandleValue vp, bool callHook)
{
return handleUncaughtExceptionHelper(ac, &vp, callHook);
}
JSTrapStatus
Debugger::handleUncaughtException(Maybe<AutoCompartment>& ac, bool callHook)
{
return handleUncaughtExceptionHelper(ac, nullptr, callHook);
}
/* static */ void
Debugger::resultToCompletion(JSContext* cx, bool ok, const Value& rv,
JSTrapStatus* status, MutableHandleValue value)
{
MOZ_ASSERT_IF(ok, !cx->isExceptionPending());
if (ok) {
*status = JSTRAP_RETURN;
value.set(rv);
} else if (cx->isExceptionPending()) {
*status = JSTRAP_THROW;
if (!cx->getPendingException(value))
*status = JSTRAP_ERROR;
cx->clearPendingException();
} else {
*status = JSTRAP_ERROR;
value.setUndefined();
}
}
bool
Debugger::newCompletionValue(JSContext* cx, JSTrapStatus status, Value value_,
MutableHandleValue result)
{
/*
* We must be in the debugger's compartment, since that's where we want
* to construct the completion value.
*/
assertSameCompartment(cx, object.get());
RootedId key(cx);
RootedValue value(cx, value_);
switch (status) {
case JSTRAP_RETURN:
key = NameToId(cx->names().return_);
break;
case JSTRAP_THROW:
key = NameToId(cx->names().throw_);
break;
case JSTRAP_ERROR:
result.setNull();
return true;
default:
MOZ_CRASH("bad status passed to Debugger::newCompletionValue");
}
/* Common tail for JSTRAP_RETURN and JSTRAP_THROW. */
RootedPlainObject obj(cx, NewBuiltinClassInstance<PlainObject>(cx));
if (!obj ||
!wrapDebuggeeValue(cx, &value) ||
!NativeDefineProperty(cx, obj, key, value, nullptr, nullptr, JSPROP_ENUMERATE))
{
return false;
}
result.setObject(*obj);
return true;
}
bool
Debugger::receiveCompletionValue(Maybe<AutoCompartment>& ac, bool ok,
HandleValue val,
MutableHandleValue vp)
{
JSContext* cx = ac->context()->asJSContext();
JSTrapStatus status;
RootedValue value(cx);
resultToCompletion(cx, ok, val, &status, &value);
ac.reset();
return newCompletionValue(cx, status, value, vp);
}
static bool
GetStatusProperty(JSContext* cx, HandleObject obj, HandlePropertyName name, JSTrapStatus status,
JSTrapStatus* statusOut, MutableHandleValue vp, int* hits)
{
bool found;
if (!HasProperty(cx, obj, name, &found))
return false;
if (found) {
++*hits;
*statusOut = status;
if (!GetProperty(cx, obj, obj, name, vp))
return false;
}
return true;
}
static bool
ParseResumptionValueAsObject(JSContext* cx, HandleValue rv, JSTrapStatus* statusp,
MutableHandleValue vp)
{
int hits = 0;
if (rv.isObject()) {
RootedObject obj(cx, &rv.toObject());
if (!GetStatusProperty(cx, obj, cx->names().return_, JSTRAP_RETURN, statusp, vp, &hits))
return false;
if (!GetStatusProperty(cx, obj, cx->names().throw_, JSTRAP_THROW, statusp, vp, &hits))
return false;
}
if (hits != 1) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_BAD_RESUMPTION);
return false;
}
return true;
}
JSTrapStatus
Debugger::parseResumptionValue(Maybe<AutoCompartment>& ac, bool ok, const Value& rv, MutableHandleValue vp,
bool callHook)
{
vp.setUndefined();
if (!ok)
return handleUncaughtException(ac, vp, callHook);
if (rv.isUndefined()) {
ac.reset();
return JSTRAP_CONTINUE;
}
if (rv.isNull()) {
ac.reset();
return JSTRAP_ERROR;
}
JSContext* cx = ac->context()->asJSContext();
JSTrapStatus status = JSTRAP_CONTINUE;
RootedValue v(cx);
RootedValue rvRoot(cx, rv);
if (!ParseResumptionValueAsObject(cx, rvRoot, &status, &v) ||
!unwrapDebuggeeValue(cx, &v))
{
return handleUncaughtException(ac, vp, callHook);
}
ac.reset();
if (!cx->compartment()->wrap(cx, &v)) {
vp.setUndefined();
return JSTRAP_ERROR;
}
vp.set(v);
return status;
}
static bool
CallMethodIfPresent(JSContext* cx, HandleObject obj, const char* name, int argc, Value* argv,
MutableHandleValue rval)
{
rval.setUndefined();
JSAtom* atom = Atomize(cx, name, strlen(name));
if (!atom)
return false;
RootedId id(cx, AtomToId(atom));
RootedValue fval(cx);
return GetProperty(cx, obj, obj, id, &fval) &&
(!IsCallable(fval) || Invoke(cx, ObjectValue(*obj), fval, argc, argv, rval));
}
JSTrapStatus
Debugger::fireDebuggerStatement(JSContext* cx, MutableHandleValue vp)
{
RootedObject hook(cx, getHook(OnDebuggerStatement));
MOZ_ASSERT(hook);
MOZ_ASSERT(hook->isCallable());
Maybe<AutoCompartment> ac;
ac.emplace(cx, object);
ScriptFrameIter iter(cx);
RootedValue scriptFrame(cx);
if (!getScriptFrame(cx, iter, &scriptFrame))
return handleUncaughtException(ac, false);
RootedValue rv(cx);
bool ok = Invoke(cx, ObjectValue(*object), ObjectValue(*hook), 1, scriptFrame.address(), &rv);
return parseResumptionValue(ac, ok, rv, vp);
}
JSTrapStatus
Debugger::fireExceptionUnwind(JSContext* cx, MutableHandleValue vp)
{
RootedObject hook(cx, getHook(OnExceptionUnwind));
MOZ_ASSERT(hook);
MOZ_ASSERT(hook->isCallable());
RootedValue exc(cx);
if (!cx->getPendingException(&exc))
return JSTRAP_ERROR;
cx->clearPendingException();
Maybe<AutoCompartment> ac;
ac.emplace(cx, object);
JS::AutoValueArray<2> argv(cx);
argv[0].setUndefined();
argv[1].set(exc);
ScriptFrameIter iter(cx);
if (!getScriptFrame(cx, iter, argv[0]) || !wrapDebuggeeValue(cx, argv[1]))
return handleUncaughtException(ac, false);
RootedValue rv(cx);
bool ok = Invoke(cx, ObjectValue(*object), ObjectValue(*hook), 2, argv.begin(), &rv);
JSTrapStatus st = parseResumptionValue(ac, ok, rv, vp);
if (st == JSTRAP_CONTINUE)
cx->setPendingException(exc);
return st;
}
JSTrapStatus
Debugger::fireEnterFrame(JSContext* cx, AbstractFramePtr frame, MutableHandleValue vp)
{
RootedObject hook(cx, getHook(OnEnterFrame));
MOZ_ASSERT(hook);
MOZ_ASSERT(hook->isCallable());
Maybe<AutoCompartment> ac;
ac.emplace(cx, object);
RootedValue scriptFrame(cx);
if (!getScriptFrame(cx, frame, &scriptFrame))
return handleUncaughtException(ac, false);
RootedValue rv(cx);
bool ok = Invoke(cx, ObjectValue(*object), ObjectValue(*hook), 1, scriptFrame.address(), &rv);
return parseResumptionValue(ac, ok, rv, vp);
}
void
Debugger::fireNewScript(JSContext* cx, HandleScript script)
{
RootedObject hook(cx, getHook(OnNewScript));
MOZ_ASSERT(hook);
MOZ_ASSERT(hook->isCallable());
Maybe<AutoCompartment> ac;
ac.emplace(cx, object);
JSObject* dsobj = wrapScript(cx, script);
if (!dsobj) {
handleUncaughtException(ac, false);
return;
}
RootedValue scriptObject(cx, ObjectValue(*dsobj));
RootedValue rv(cx);
if (!Invoke(cx, ObjectValue(*object), ObjectValue(*hook), 1, scriptObject.address(), &rv))
handleUncaughtException(ac, true);
}
void
Debugger::fireOnGarbageCollectionHook(JSContext* cx,
const JS::dbg::GarbageCollectionEvent::Ptr& gcData)
{
MOZ_ASSERT(observedGC(gcData->majorGCNumber()));
observedGCs.remove(gcData->majorGCNumber());
RootedObject hook(cx, getHook(OnGarbageCollection));
MOZ_ASSERT(hook);
MOZ_ASSERT(hook->isCallable());
Maybe<AutoCompartment> ac;
ac.emplace(cx, object);
JSObject* dataObj = gcData->toJSObject(cx);
if (!dataObj) {
handleUncaughtException(ac, false);
return;
}
RootedValue dataVal(cx, ObjectValue(*dataObj));
RootedValue rv(cx);
if (!Invoke(cx, ObjectValue(*object), ObjectValue(*hook), 1, dataVal.address(), &rv))
handleUncaughtException(ac, true);
}
JSTrapStatus
Debugger::fireOnIonCompilationHook(JSContext* cx, Handle<ScriptVector> scripts, LSprinter& graph)
{
RootedObject hook(cx, getHook(OnIonCompilation));
MOZ_ASSERT(hook);
MOZ_ASSERT(hook->isCallable());
Maybe<AutoCompartment> ac;
ac.emplace(cx, object);
// Copy the vector of scripts to a JS Array of Debugger.Script
RootedObject tmpObj(cx);
RootedValue tmpVal(cx);
AutoValueVector dbgScripts(cx);
for (size_t i = 0; i < scripts.length(); i++) {
tmpObj = wrapScript(cx, scripts[i]);
if (!tmpObj)
return handleUncaughtException(ac, false);
tmpVal.setObject(*tmpObj);
if (!dbgScripts.append(tmpVal))
return handleUncaughtException(ac, false);
}
RootedObject dbgScriptsArray(cx, JS_NewArrayObject(cx, dbgScripts));
if (!dbgScriptsArray)
return handleUncaughtException(ac, false);
// Copy the JSON compilation graph to a JS String which is allocated as part
// of the Debugger compartment.
Sprinter jsonPrinter(cx);
if (!jsonPrinter.init())
return handleUncaughtException(ac, false);
graph.exportInto(jsonPrinter);
if (jsonPrinter.hadOutOfMemory())
return handleUncaughtException(ac, false);
RootedString json(cx, JS_NewStringCopyZ(cx, jsonPrinter.string()));
if (!json)
return handleUncaughtException(ac, false);
// Create a JS Object which has the array of scripts, and the string of the
// JSON graph.
const char* names[] = { "scripts", "json" };
JS::AutoValueArray<2> values(cx);
values[0].setObject(*dbgScriptsArray);
values[1].setString(json);
RootedObject obj(cx, JS_NewObject(cx, nullptr));
if (!obj)
return handleUncaughtException(ac, false);
MOZ_ASSERT(mozilla::ArrayLength(names) == values.length());
for (size_t i = 0; i < mozilla::ArrayLength(names); i++) {
if (!JS_DefineProperty(cx, obj, names[i], values[i], JSPROP_ENUMERATE, nullptr, nullptr))
return handleUncaughtException(ac, false);
}
// Call Debugger.onIonCompilation hook.
JS::AutoValueArray<1> argv(cx);
argv[0].setObject(*obj);
RootedValue rv(cx);
if (!Invoke(cx, ObjectValue(*object), ObjectValue(*hook), 1, argv.begin(), &rv))
return handleUncaughtException(ac, true);
return JSTRAP_CONTINUE;
}
template <typename HookIsEnabledFun /* bool (Debugger*) */,
typename FireHookFun /* JSTrapStatus (Debugger*) */>
/* static */ JSTrapStatus
Debugger::dispatchHook(JSContext* cx, HookIsEnabledFun hookIsEnabled, FireHookFun fireHook)
{
/*
* Determine which debuggers will receive this event, and in what order.
* Make a copy of the list, since the original is mutable and we will be
* calling into arbitrary JS.
*
* Note: In the general case, 'triggered' contains references to objects in
* different compartments--every compartment *except* this one.
*/
AutoValueVector triggered(cx);
Handle<GlobalObject*> global = cx->global();
if (GlobalObject::DebuggerVector* debuggers = global->getDebuggers()) {
for (Debugger** p = debuggers->begin(); p != debuggers->end(); p++) {
Debugger* dbg = *p;
if (dbg->enabled && hookIsEnabled(dbg)) {
if (!triggered.append(ObjectValue(*dbg->toJSObject())))
return JSTRAP_ERROR;
}
}
}
/*
* Deliver the event to each debugger, checking again to make sure it
* should still be delivered.
*/
for (Value* p = triggered.begin(); p != triggered.end(); p++) {
Debugger* dbg = Debugger::fromJSObject(&p->toObject());
if (dbg->debuggees.has(global) && dbg->enabled && hookIsEnabled(dbg)) {
JSTrapStatus st = fireHook(dbg);
if (st != JSTRAP_CONTINUE)
return st;
}
}
return JSTRAP_CONTINUE;
}
void
Debugger::slowPathOnNewScript(JSContext* cx, HandleScript script)
{
JSTrapStatus status = dispatchHook(
cx,
[script](Debugger* dbg) -> bool {
return dbg->observesNewScript() && dbg->observesScript(script);
},
[&](Debugger* dbg) -> JSTrapStatus {
dbg->fireNewScript(cx, script);
return JSTRAP_CONTINUE;
});
if (status == JSTRAP_ERROR) {
ReportOutOfMemory(cx);
return;
}
MOZ_ASSERT(status == JSTRAP_CONTINUE);
}
/* static */ JSTrapStatus
Debugger::onTrap(JSContext* cx, MutableHandleValue vp)
{
ScriptFrameIter iter(cx);
RootedScript script(cx, iter.script());
MOZ_ASSERT(script->isDebuggee());
Rooted<GlobalObject*> scriptGlobal(cx, &script->global());
jsbytecode* pc = iter.pc();
BreakpointSite* site = script->getBreakpointSite(pc);
JSOp op = JSOp(*pc);
/* Build list of breakpoint handlers. */
Vector<Breakpoint*> triggered(cx);
for (Breakpoint* bp = site->firstBreakpoint(); bp; bp = bp->nextInSite()) {
if (!triggered.append(bp))
return JSTRAP_ERROR;
}
for (Breakpoint** p = triggered.begin(); p != triggered.end(); p++) {
Breakpoint* bp = *p;
/* Handlers can clear breakpoints. Check that bp still exists. */
if (!site || !site->hasBreakpoint(bp))
continue;
/*
* There are two reasons we have to check whether dbg is enabled and
* debugging scriptGlobal.
*
* One is just that one breakpoint handler can disable other Debuggers
* or remove debuggees.
*
* The other has to do with non-compile-and-go scripts, which have no
* specific global--until they are executed. Only now do we know which
* global the script is running against.
*/
Debugger* dbg = bp->debugger;
bool hasDebuggee = dbg->enabled && dbg->debuggees.has(scriptGlobal);
if (hasDebuggee) {
Maybe<AutoCompartment> ac;
ac.emplace(cx, dbg->object);
RootedValue scriptFrame(cx);
if (!dbg->getScriptFrame(cx, iter, &scriptFrame))
return dbg->handleUncaughtException(ac, false);
RootedValue rv(cx);
Rooted<JSObject*> handler(cx, bp->handler);
bool ok = CallMethodIfPresent(cx, handler, "hit", 1, scriptFrame.address(), &rv);
JSTrapStatus st = dbg->parseResumptionValue(ac, ok, rv, vp, true);
if (st != JSTRAP_CONTINUE)
return st;
/* Calling JS code invalidates site. Reload it. */
site = script->getBreakpointSite(pc);
}
}
/* By convention, return the true op to the interpreter in vp. */
vp.setInt32(op);
return JSTRAP_CONTINUE;
}
/* static */ JSTrapStatus
Debugger::onSingleStep(JSContext* cx, MutableHandleValue vp)
{
ScriptFrameIter iter(cx);
/*
* We may be stepping over a JSOP_EXCEPTION, that pushes the context's
* pending exception for a 'catch' clause to handle. Don't let the
* onStep handlers mess with that (other than by returning a resumption
* value).
*/
RootedValue exception(cx, UndefinedValue());
bool exceptionPending = cx->isExceptionPending();
if (exceptionPending) {
if (!cx->getPendingException(&exception))
return JSTRAP_ERROR;
cx->clearPendingException();
}
/*
* Build list of Debugger.Frame instances referring to this frame with
* onStep handlers.
*/
AutoObjectVector frames(cx);
for (FrameRange r(iter.abstractFramePtr()); !r.empty(); r.popFront()) {
NativeObject* frame = r.frontFrame();
if (!frame->getReservedSlot(JSSLOT_DEBUGFRAME_ONSTEP_HANDLER).isUndefined() &&
!frames.append(frame))
{
return JSTRAP_ERROR;
}
}
#ifdef DEBUG
/*
* Validate the single-step count on this frame's script, to ensure that
* we're not receiving traps we didn't ask for. Even when frames is
* non-empty (and thus we know this trap was requested), do the check
* anyway, to make sure the count has the correct non-zero value.
*
* The converse --- ensuring that we do receive traps when we should --- can
* be done with unit tests.
*/
{
uint32_t stepperCount = 0;
JSScript* trappingScript = iter.script();
GlobalObject* global = cx->global();
if (GlobalObject::DebuggerVector* debuggers = global->getDebuggers()) {
for (Debugger** p = debuggers->begin(); p != debuggers->end(); p++) {
Debugger* dbg = *p;
for (FrameMap::Range r = dbg->frames.all(); !r.empty(); r.popFront()) {
AbstractFramePtr frame = r.front().key();
NativeObject* frameobj = r.front().value();
if (frame.script() == trappingScript &&
!frameobj->getReservedSlot(JSSLOT_DEBUGFRAME_ONSTEP_HANDLER).isUndefined())
{
stepperCount++;
}
}
}
}
MOZ_ASSERT(stepperCount == trappingScript->stepModeCount());
}
#endif
/* Call all the onStep handlers we found. */
for (JSObject** p = frames.begin(); p != frames.end(); p++) {
RootedNativeObject frame(cx, &(*p)->as<NativeObject>());
Debugger* dbg = Debugger::fromChildJSObject(frame);
Maybe<AutoCompartment> ac;
ac.emplace(cx, dbg->object);
const Value& handler = frame->getReservedSlot(JSSLOT_DEBUGFRAME_ONSTEP_HANDLER);
RootedValue rval(cx);
bool ok = Invoke(cx, ObjectValue(*frame), handler, 0, nullptr, &rval);
JSTrapStatus st = dbg->parseResumptionValue(ac, ok, rval, vp);
if (st != JSTRAP_CONTINUE)
return st;
}
vp.setUndefined();
if (exceptionPending)
cx->setPendingException(exception);
return JSTRAP_CONTINUE;
}
JSTrapStatus
Debugger::fireNewGlobalObject(JSContext* cx, Handle<GlobalObject*> global, MutableHandleValue vp)
{
RootedObject hook(cx, getHook(OnNewGlobalObject));
MOZ_ASSERT(hook);
MOZ_ASSERT(hook->isCallable());
Maybe<AutoCompartment> ac;
ac.emplace(cx, object);
RootedValue wrappedGlobal(cx, ObjectValue(*global));
if (!wrapDebuggeeValue(cx, &wrappedGlobal))
return handleUncaughtException(ac, false);
RootedValue rv(cx);
// onNewGlobalObject is infallible, and thus is only allowed to return
// undefined as a resumption value. If it returns anything else, we throw.
// And if that happens, or if the hook itself throws, we invoke the
// uncaughtExceptionHook so that we never leave an exception pending on the
// cx. This allows JS_NewGlobalObject to avoid handling failures from debugger
// hooks.
bool ok = Invoke(cx, ObjectValue(*object), ObjectValue(*hook), 1, wrappedGlobal.address(), &rv);
if (ok && !rv.isUndefined()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_DEBUG_RESUMPTION_VALUE_DISALLOWED);
ok = false;
}
// NB: Even though we don't care about what goes into it, we have to pass vp
// to handleUncaughtException so that it parses resumption values from the
// uncaughtExceptionHook and tells the caller whether we should execute the
// rest of the onNewGlobalObject hooks or not.
JSTrapStatus status = ok ? JSTRAP_CONTINUE
: handleUncaughtException(ac, vp, true);
MOZ_ASSERT(!cx->isExceptionPending());
return status;
}
void
Debugger::slowPathOnNewGlobalObject(JSContext* cx, Handle<GlobalObject*> global)
{
MOZ_ASSERT(!JS_CLIST_IS_EMPTY(&cx->runtime()->onNewGlobalObjectWatchers));
if (global->compartment()->options().invisibleToDebugger())
return;
/*
* Make a copy of the runtime's onNewGlobalObjectWatchers before running the
* handlers. Since one Debugger's handler can disable another's, the list
* can be mutated while we're walking it.
*/
AutoObjectVector watchers(cx);
for (JSCList* link = JS_LIST_HEAD(&cx->runtime()->onNewGlobalObjectWatchers);
link != &cx->runtime()->onNewGlobalObjectWatchers;
link = JS_NEXT_LINK(link))
{
Debugger* dbg = fromOnNewGlobalObjectWatchersLink(link);
MOZ_ASSERT(dbg->observesNewGlobalObject());
JSObject* obj = dbg->object;
JS::ExposeObjectToActiveJS(obj);
if (!watchers.append(obj))
return;
}
JSTrapStatus status = JSTRAP_CONTINUE;
RootedValue value(cx);
for (size_t i = 0; i < watchers.length(); i++) {
Debugger* dbg = fromJSObject(watchers[i]);
// We disallow resumption values from onNewGlobalObject hooks, because we
// want the debugger hooks for global object creation to be infallible.
// But if an onNewGlobalObject hook throws, and the uncaughtExceptionHook
// decides to raise an error, we want to at least avoid invoking the rest
// of the onNewGlobalObject handlers in the list (not for any super
// compelling reason, just because it seems like the right thing to do).
// So we ignore whatever comes out in |value|, but break out of the loop
// if a non-success trap status is returned.
if (dbg->observesNewGlobalObject()) {
status = dbg->fireNewGlobalObject(cx, global, &value);
if (status != JSTRAP_CONTINUE && status != JSTRAP_RETURN)
break;
}
}
MOZ_ASSERT(!cx->isExceptionPending());
}
/* static */ bool
Debugger::slowPathOnLogAllocationSite(JSContext* cx, HandleObject obj, HandleSavedFrame frame,
double when, GlobalObject::DebuggerVector& dbgs)
{
MOZ_ASSERT(!dbgs.empty());
mozilla::DebugOnly<Debugger**> begin = dbgs.begin();
for (Debugger** dbgp = dbgs.begin(); dbgp < dbgs.end(); dbgp++) {
// The set of debuggers had better not change while we're iterating,
// such that the vector gets reallocated.
MOZ_ASSERT(dbgs.begin() == begin);
if ((*dbgp)->trackingAllocationSites &&
(*dbgp)->enabled &&
!(*dbgp)->appendAllocationSite(cx, obj, frame, when))
{
return false;
}
}
return true;
}
/* static */ void
Debugger::slowPathOnIonCompilation(JSContext* cx, Handle<ScriptVector> scripts, LSprinter& graph)
{
JSTrapStatus status = dispatchHook(
cx,
[](Debugger* dbg) -> bool { return dbg->getHook(OnIonCompilation); },
[&](Debugger* dbg) -> JSTrapStatus {
(void) dbg->fireOnIonCompilationHook(cx, scripts, graph);
return JSTRAP_CONTINUE;
});
if (status == JSTRAP_ERROR) {
cx->clearPendingException();
return;
}
MOZ_ASSERT(status == JSTRAP_CONTINUE);
}
bool
Debugger::isDebuggeeUnbarriered(const JSCompartment* compartment) const
{
MOZ_ASSERT(compartment);
return compartment->isDebuggee() && debuggees.has(compartment->unsafeUnbarrieredMaybeGlobal());
}
Debugger::TenurePromotionsLogEntry::TenurePromotionsLogEntry(JSRuntime* rt, JSObject& obj, double when)
: className(obj.getClass()->name),
when(when),
frame(getObjectAllocationSite(obj)),
size(JS::ubi::Node(&obj).size(rt->debuggerMallocSizeOf))
{ }
void
Debugger::logTenurePromotion(JSRuntime* rt, JSObject& obj, double when)
{
AutoEnterOOMUnsafeRegion oomUnsafe;
if (!tenurePromotionsLog.emplaceBack(rt, obj, when))
oomUnsafe.crash("Debugger::logTenurePromotion");
if (tenurePromotionsLog.length() > maxTenurePromotionsLogLength) {
if (!tenurePromotionsLog.popFront())
oomUnsafe.crash("Debugger::logTenurePromotion");
MOZ_ASSERT(tenurePromotionsLog.length() == maxTenurePromotionsLogLength);
tenurePromotionsLogOverflowed = true;
}
}
bool
Debugger::appendAllocationSite(JSContext* cx, HandleObject obj, HandleSavedFrame frame,
double when)
{
MOZ_ASSERT(trackingAllocationSites && enabled);
AutoCompartment ac(cx, object);
RootedObject wrappedFrame(cx, frame);
if (!cx->compartment()->wrap(cx, &wrappedFrame))
return false;
RootedAtom ctorName(cx);
{
AutoCompartment ac(cx, obj);
if (!obj->constructorDisplayAtom(cx, &ctorName))
return false;
}
auto className = obj->getClass()->name;
auto size = JS::ubi::Node(obj.get()).size(cx->runtime()->debuggerMallocSizeOf);
auto inNursery = gc::IsInsideNursery(obj);
if (!allocationsLog.emplaceBack(wrappedFrame, when, className, ctorName, size, inNursery)) {
ReportOutOfMemory(cx);
return false;
}
if (allocationsLog.length() > maxAllocationsLogLength) {
if (!allocationsLog.popFront()) {
ReportOutOfMemory(cx);
return false;
}
MOZ_ASSERT(allocationsLog.length() == maxAllocationsLogLength);
allocationsLogOverflowed = true;
}
return true;
}
JSTrapStatus
Debugger::firePromiseHook(JSContext* cx, Hook hook, HandleObject promise, MutableHandleValue vp)
{
MOZ_ASSERT(hook == OnNewPromise || hook == OnPromiseSettled);
RootedObject hookObj(cx, getHook(hook));
MOZ_ASSERT(hookObj);
MOZ_ASSERT(hookObj->isCallable());
Maybe<AutoCompartment> ac;
ac.emplace(cx, object);
RootedValue dbgObj(cx, ObjectValue(*promise));
if (!wrapDebuggeeValue(cx, &dbgObj))
return handleUncaughtException(ac, false);
// Like onNewGlobalObject, the Promise hooks are infallible and the comments
// in |Debugger::fireNewGlobalObject| apply here as well.
RootedValue rv(cx);
bool ok = Invoke(cx, ObjectValue(*object), ObjectValue(*hookObj), 1, dbgObj.address(), &rv);
if (ok && !rv.isUndefined()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_DEBUG_RESUMPTION_VALUE_DISALLOWED);
ok = false;
}
JSTrapStatus status = ok ? JSTRAP_CONTINUE
: handleUncaughtException(ac, vp, true);
MOZ_ASSERT(!cx->isExceptionPending());
return status;
}
/* static */ void
Debugger::slowPathPromiseHook(JSContext* cx, Hook hook, HandleObject promise)
{
MOZ_ASSERT(hook == OnNewPromise || hook == OnPromiseSettled);
RootedValue rval(cx);
JSTrapStatus status = dispatchHook(
cx,
[hook](Debugger* dbg) -> bool { return dbg->getHook(hook); },
[&](Debugger* dbg) -> JSTrapStatus {
(void) dbg->firePromiseHook(cx, hook, promise, &rval);
return JSTRAP_CONTINUE;
});
if (status == JSTRAP_ERROR) {
// The dispatch hook function might fail to append into the list of
// Debuggers which are watching for the hook.
cx->clearPendingException();
return;
}
// Promise hooks are infallible and we ignore errors from uncaught
// exceptions by design.
MOZ_ASSERT(status == JSTRAP_CONTINUE);
}
/*** Debugger code invalidation for observing execution ******************************************/
class MOZ_RAII ExecutionObservableCompartments : public Debugger::ExecutionObservableSet
{
HashSet<JSCompartment*> compartments_;
HashSet<Zone*> zones_;
public:
explicit ExecutionObservableCompartments(JSContext* cx
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: compartments_(cx),
zones_(cx)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
bool init() { return compartments_.init() && zones_.init(); }
bool add(JSCompartment* comp) { return compartments_.put(comp) && zones_.put(comp->zone()); }
typedef HashSet<JSCompartment*>::Range CompartmentRange;
const HashSet<JSCompartment*>* compartments() const { return &compartments_; }
const HashSet<Zone*>* zones() const { return &zones_; }
bool shouldRecompileOrInvalidate(JSScript* script) const {
return script->hasBaselineScript() && compartments_.has(script->compartment());
}
bool shouldMarkAsDebuggee(ScriptFrameIter& iter) const {
// AbstractFramePtr can't refer to non-remateralized Ion frames, so if
// iter refers to one such, we know we don't match.
return iter.hasUsableAbstractFramePtr() && compartments_.has(iter.compartment());
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
// Given a particular AbstractFramePtr F that has become observable, this
// represents the stack frames that need to be bailed out or marked as
// debuggees, and the scripts that need to be recompiled, taking inlining into
// account.
class MOZ_RAII ExecutionObservableFrame : public Debugger::ExecutionObservableSet
{
AbstractFramePtr frame_;
public:
explicit ExecutionObservableFrame(AbstractFramePtr frame
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: frame_(frame)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
Zone* singleZone() const {
// We never inline across compartments, let alone across zones, so
// frames_'s script's zone is the only one of interest.
return frame_.script()->compartment()->zone();
}
JSScript* singleScriptForZoneInvalidation() const {
MOZ_CRASH("ExecutionObservableFrame shouldn't need zone-wide invalidation.");
return nullptr;
}
bool shouldRecompileOrInvalidate(JSScript* script) const {
// Normally, *this represents exactly one script: the one frame_ is
// running.
//
// However, debug-mode OSR uses *this for both invalidating Ion frames,
// and recompiling the Baseline scripts that those Ion frames will bail
// out into. Suppose frame_ is an inline frame, executing a copy of its
// JSScript, S_inner, that has been inlined into the IonScript of some
// other JSScript, S_outer. We must match S_outer, to decide which Ion
// frame to invalidate; and we must match S_inner, to decide which
// Baseline script to recompile.
//
// Note that this does not, by design, invalidate *all* inliners of
// frame_.script(), as only frame_ is made observable, not
// frame_.script().
if (!script->hasBaselineScript())
return false;
if (script == frame_.script())
return true;
return frame_.isRematerializedFrame() &&
script == frame_.asRematerializedFrame()->outerScript();
}
bool shouldMarkAsDebuggee(ScriptFrameIter& iter) const {
// AbstractFramePtr can't refer to non-remateralized Ion frames, so if
// iter refers to one such, we know we don't match.
//
// We never use this 'has' overload for frame invalidation, only for
// frame debuggee marking; so this overload doesn't need a parallel to
// the just-so inlining logic above.
return iter.hasUsableAbstractFramePtr() && iter.abstractFramePtr() == frame_;
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class MOZ_RAII ExecutionObservableScript : public Debugger::ExecutionObservableSet
{
RootedScript script_;
public:
ExecutionObservableScript(JSContext* cx, JSScript* script
MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: script_(cx, script)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
Zone* singleZone() const { return script_->compartment()->zone(); }
JSScript* singleScriptForZoneInvalidation() const { return script_; }
bool shouldRecompileOrInvalidate(JSScript* script) const {
return script->hasBaselineScript() && script == script_;
}
bool shouldMarkAsDebuggee(ScriptFrameIter& iter) const {
// AbstractFramePtr can't refer to non-remateralized Ion frames, and
// while a non-rematerialized Ion frame may indeed be running script_,
// we cannot mark them as debuggees until they bail out.
//
// Upon bailing out, any newly constructed Baseline frames that came
// from Ion frames with scripts that are isDebuggee() is marked as
// debuggee. This is correct in that the only other way a frame may be
// marked as debuggee is via Debugger.Frame reflection, which would
// have rematerialized any Ion frames.
return iter.hasUsableAbstractFramePtr() && iter.abstractFramePtr().script() == script_;
}
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
/* static */ bool
Debugger::updateExecutionObservabilityOfFrames(JSContext* cx, const ExecutionObservableSet& obs,
IsObserving observing)
{
AutoSuppressProfilerSampling suppressProfilerSampling(cx);
{
jit::JitContext jctx(cx, nullptr);
if (!jit::RecompileOnStackBaselineScriptsForDebugMode(cx, obs, observing)) {
ReportOutOfMemory(cx);
return false;
}
}
AbstractFramePtr oldestEnabledFrame;
for (ScriptFrameIter iter(cx, ScriptFrameIter::ALL_CONTEXTS,
ScriptFrameIter::GO_THROUGH_SAVED);
!iter.done();
++iter)
{
if (obs.shouldMarkAsDebuggee(iter)) {
if (observing) {
if (!iter.abstractFramePtr().isDebuggee()) {
oldestEnabledFrame = iter.abstractFramePtr();
oldestEnabledFrame.setIsDebuggee();
}
} else {
#ifdef DEBUG
// Debugger.Frame lifetimes are managed by the debug epilogue,
// so in general it's unsafe to unmark a frame if it has a
// Debugger.Frame associated with it.
FrameRange r(iter.abstractFramePtr());
MOZ_ASSERT(r.empty());
#endif
iter.abstractFramePtr().unsetIsDebuggee();
}
}
}
// See comment in unsetPrevUpToDateUntil.
if (oldestEnabledFrame) {
AutoCompartment ac(cx, oldestEnabledFrame.compartment());
DebugScopes::unsetPrevUpToDateUntil(cx, oldestEnabledFrame);
}
return true;
}
static inline void
MarkBaselineScriptActiveIfObservable(JSScript* script, const Debugger::ExecutionObservableSet& obs)
{
if (obs.shouldRecompileOrInvalidate(script))
script->baselineScript()->setActive();
}
static bool
AppendAndInvalidateScript(JSContext* cx, Zone* zone, JSScript* script, Vector<JSScript*>& scripts)
{
// Enter the script's compartment as addPendingRecompile attempts to
// cancel off-thread compilations, whose books are kept on the
// script's compartment.
MOZ_ASSERT(script->compartment()->zone() == zone);
AutoCompartment ac(cx, script->compartment());
zone->types.addPendingRecompile(cx, script);
return scripts.append(script);
}
static bool
UpdateExecutionObservabilityOfScriptsInZone(JSContext* cx, Zone* zone,
const Debugger::ExecutionObservableSet& obs,
Debugger::IsObserving observing)
{
using namespace js::jit;
// See note in js::ReleaseAllJITCode.
cx->runtime()->gc.evictNursery();
AutoSuppressProfilerSampling suppressProfilerSampling(cx);
JSRuntime* rt = cx->runtime();
FreeOp* fop = cx->runtime()->defaultFreeOp();
// Mark active baseline scripts in the observable set so that they don't
// get discarded. They will be recompiled.
for (JitActivationIterator actIter(rt); !actIter.done(); ++actIter) {
if (actIter->compartment()->zone() != zone)
continue;
for (JitFrameIterator iter(actIter); !iter.done(); ++iter) {
switch (iter.type()) {
case JitFrame_BaselineJS:
MarkBaselineScriptActiveIfObservable(iter.script(), obs);
break;
case JitFrame_IonJS:
MarkBaselineScriptActiveIfObservable(iter.script(), obs);
for (InlineFrameIterator inlineIter(rt, &iter); inlineIter.more(); ++inlineIter)
MarkBaselineScriptActiveIfObservable(inlineIter.script(), obs);
break;
default:;
}
}
}
Vector<JSScript*> scripts(cx);
// Iterate through observable scripts, invalidating their Ion scripts and
// appending them to a vector for discarding their baseline scripts later.
{
AutoEnterAnalysis enter(fop, zone);
if (JSScript* script = obs.singleScriptForZoneInvalidation()) {
if (obs.shouldRecompileOrInvalidate(script)) {
if (!AppendAndInvalidateScript(cx, zone, script, scripts))
return false;
}
} else {
for (gc::ZoneCellIter iter(zone, gc::AllocKind::SCRIPT); !iter.done(); iter.next()) {
JSScript* script = iter.get<JSScript>();
if (obs.shouldRecompileOrInvalidate(script) &&
!gc::IsAboutToBeFinalizedUnbarriered(&script))
{
if (!AppendAndInvalidateScript(cx, zone, script, scripts))
return false;
}
}
}
}
// Iterate through the scripts again and finish discarding
// BaselineScripts. This must be done as a separate phase as we can only
// discard the BaselineScript on scripts that have no IonScript.
for (size_t i = 0; i < scripts.length(); i++) {
MOZ_ASSERT_IF(scripts[i]->isDebuggee(), observing);
FinishDiscardBaselineScript(fop, scripts[i]);
}
return true;
}
/* static */ bool
Debugger::updateExecutionObservabilityOfScripts(JSContext* cx, const ExecutionObservableSet& obs,
IsObserving observing)
{
if (Zone* zone = obs.singleZone())
return UpdateExecutionObservabilityOfScriptsInZone(cx, zone, obs, observing);
typedef ExecutionObservableSet::ZoneRange ZoneRange;
for (ZoneRange r = obs.zones()->all(); !r.empty(); r.popFront()) {
if (!UpdateExecutionObservabilityOfScriptsInZone(cx, r.front(), obs, observing))
return false;
}
return true;
}
/* static */ bool
Debugger::updateExecutionObservability(JSContext* cx, ExecutionObservableSet& obs,
IsObserving observing)
{
if (!obs.singleZone() && obs.zones()->empty())
return true;
// Invalidate scripts first so we can set the needsArgsObj flag on scripts
// before patching frames.
return updateExecutionObservabilityOfScripts(cx, obs, observing) &&
updateExecutionObservabilityOfFrames(cx, obs, observing);
}
/* static */ bool
Debugger::ensureExecutionObservabilityOfScript(JSContext* cx, JSScript* script)
{
if (script->isDebuggee())
return true;
ExecutionObservableScript obs(cx, script);
return updateExecutionObservability(cx, obs, Observing);
}
/* static */ bool
Debugger::ensureExecutionObservabilityOfOsrFrame(JSContext* cx, InterpreterFrame* frame)
{
MOZ_ASSERT(frame->isDebuggee());
if (frame->script()->hasBaselineScript() &&
frame->script()->baselineScript()->hasDebugInstrumentation())
{
return true;
}
ExecutionObservableFrame obs(frame);
return updateExecutionObservabilityOfFrames(cx, obs, Observing);
}
/* static */ bool
Debugger::ensureExecutionObservabilityOfFrame(JSContext* cx, AbstractFramePtr frame)
{
MOZ_ASSERT_IF(frame.script()->isDebuggee(), frame.isDebuggee());
if (frame.isDebuggee())
return true;
ExecutionObservableFrame obs(frame);
return updateExecutionObservabilityOfFrames(cx, obs, Observing);
}
/* static */ bool
Debugger::ensureExecutionObservabilityOfCompartment(JSContext* cx, JSCompartment* comp)
{
if (comp->debuggerObservesAllExecution())
return true;
ExecutionObservableCompartments obs(cx);
if (!obs.init() || !obs.add(comp))
return false;
comp->updateDebuggerObservesAllExecution();
return updateExecutionObservability(cx, obs, Observing);
}
/* static */ bool
Debugger::hookObservesAllExecution(Hook which)
{
return which == OnEnterFrame;
}
Debugger::IsObserving
Debugger::observesAllExecution() const
{
if (enabled && !!getHook(OnEnterFrame))
return Observing;
return NotObserving;
}
Debugger::IsObserving
Debugger::observesAsmJS() const
{
if (enabled && !allowUnobservedAsmJS)
return Observing;
return NotObserving;
}
Debugger::IsObserving
Debugger::observesCoverage() const
{
if (enabled && collectCoverageInfo)
return Observing;
return NotObserving;
}
// Toggle whether this Debugger's debuggees observe all execution. This is
// called when a hook that observes all execution is set or unset. See
// hookObservesAllExecution.
bool
Debugger::updateObservesAllExecutionOnDebuggees(JSContext* cx, IsObserving observing)
{
ExecutionObservableCompartments obs(cx);
if (!obs.init())
return false;
for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty(); r.popFront()) {
GlobalObject* global = r.front();
JSCompartment* comp = global->compartment();
if (comp->debuggerObservesAllExecution() == observing)
continue;
// It's expensive to eagerly invalidate and recompile a compartment,
// so add the compartment to the set only if we are observing.
if (observing && !obs.add(comp))
return false;
comp->updateDebuggerObservesAllExecution();
}
return updateExecutionObservability(cx, obs, observing);
}
bool
Debugger::updateObservesCoverageOnDebuggees(JSContext* cx, IsObserving observing)
{
ExecutionObservableCompartments obs(cx);
if (!obs.init())
return false;
for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty(); r.popFront()) {
GlobalObject* global = r.front();
JSCompartment* comp = global->compartment();
if (comp->debuggerObservesCoverage() == observing)
continue;
// Invalidate and recompile a compartment to add or remove PCCounts
// increments. We have to eagerly invalidate, as otherwise we might have
// dangling pointers to freed PCCounts.
if (!obs.add(comp))
return false;
}
// If any frame on the stack belongs to the debuggee, then we cannot update
// the ScriptCounts, because this would imply to invalidate a Debugger.Frame
// to recompile it with/without ScriptCount support.
for (ScriptFrameIter iter(cx, ScriptFrameIter::ALL_CONTEXTS,
ScriptFrameIter::GO_THROUGH_SAVED);
!iter.done();
++iter)
{
if (obs.shouldMarkAsDebuggee(iter)) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_NOT_IDLE);
return false;
}
}
if (!updateExecutionObservability(cx, obs, observing))
return false;
// All compartments can safely be toggled, and all scripts will be
// recompiled. Thus we can update each compartment accordingly.
typedef ExecutionObservableCompartments::CompartmentRange CompartmentRange;
for (CompartmentRange r = obs.compartments()->all(); !r.empty(); r.popFront())
r.front()->updateDebuggerObservesCoverage();
return true;
}
void
Debugger::updateObservesAsmJSOnDebuggees(IsObserving observing)
{
for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty(); r.popFront()) {
GlobalObject* global = r.front();
JSCompartment* comp = global->compartment();
if (comp->debuggerObservesAsmJS() == observing)
continue;
comp->updateDebuggerObservesAsmJS();
}
}
/*** Allocations Tracking *************************************************************************/
/* static */ bool
Debugger::cannotTrackAllocations(const GlobalObject& global)
{
auto existingCallback = global.compartment()->getObjectMetadataCallback();
return existingCallback && existingCallback != SavedStacksMetadataCallback;
}
/* static */ bool
Debugger::isObservedByDebuggerTrackingAllocations(const GlobalObject& debuggee)
{
if (auto* v = debuggee.getDebuggers()) {
Debugger** p;
for (p = v->begin(); p != v->end(); p++) {
if ((*p)->trackingAllocationSites && (*p)->enabled) {
return true;
}
}
}
return false;
}
/* static */ bool
Debugger::addAllocationsTracking(JSContext* cx, Handle<GlobalObject*> debuggee)
{
// Precondition: the given global object is being observed by at least one
// Debugger that is tracking allocations.
MOZ_ASSERT(isObservedByDebuggerTrackingAllocations(*debuggee));
if (Debugger::cannotTrackAllocations(*debuggee)) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_OBJECT_METADATA_CALLBACK_ALREADY_SET);
return false;
}
debuggee->compartment()->setObjectMetadataCallback(SavedStacksMetadataCallback);
debuggee->compartment()->chooseAllocationSamplingProbability();
return true;
}
/* static */ void
Debugger::removeAllocationsTracking(GlobalObject& global)
{
// If there are still Debuggers that are observing allocations, we cannot
// remove the metadata callback yet. Recompute the sampling probability
// based on the remaining debuggers' needs.
if (isObservedByDebuggerTrackingAllocations(global)) {
global.compartment()->chooseAllocationSamplingProbability();
return;
}
global.compartment()->forgetObjectMetadataCallback();
}
bool
Debugger::addAllocationsTrackingForAllDebuggees(JSContext* cx)
{
MOZ_ASSERT(trackingAllocationSites);
// We don't want to end up in a state where we added allocations
// tracking to some of our debuggees, but failed to do so for
// others. Before attempting to start tracking allocations in *any* of
// our debuggees, ensure that we will be able to track allocations for
// *all* of our debuggees.
for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty(); r.popFront()) {
if (Debugger::cannotTrackAllocations(*r.front().get())) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_OBJECT_METADATA_CALLBACK_ALREADY_SET);
return false;
}
}
Rooted<GlobalObject*> g(cx);
for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty(); r.popFront()) {
// This should always succeed, since we already checked for the
// error case above.
g = r.front().get();
MOZ_ALWAYS_TRUE(Debugger::addAllocationsTracking(cx, g));
}
return true;
}
void
Debugger::removeAllocationsTrackingForAllDebuggees()
{
for (WeakGlobalObjectSet::Range r = debuggees.all(); !r.empty(); r.popFront())
Debugger::removeAllocationsTracking(*r.front().get());
allocationsLog.clear();
}
/*** Debugger JSObjects **************************************************************************/
void
Debugger::markCrossCompartmentEdges(JSTracer* trc)
{
objects.markCrossCompartmentEdges<DebuggerObject_trace>(trc);
environments.markCrossCompartmentEdges<DebuggerEnv_trace>(trc);
scripts.markCrossCompartmentEdges<DebuggerScript_trace>(trc);
sources.markCrossCompartmentEdges<DebuggerSource_trace>(trc);
// Because we don't have access to a `cx` inside
// `Debugger::logTenurePromotion`, we can't hold onto CCWs inside the log,
// and instead have unwrapped cross-compartment edges. We need to be sure to
// mark those here.
TenurePromotionsLog::trace(&tenurePromotionsLog, trc);
}
/*
* Ordinarily, WeakMap keys and values are marked because at some point it was
* discovered that the WeakMap was live; that is, some object containing the
* WeakMap was marked during mark phase.
*
* However, during zone GC, we have to do something about cross-compartment
* edges in non-GC'd compartments. Since the source may be live, we
* conservatively assume it is and mark the edge.
*
* Each Debugger object keeps four cross-compartment WeakMaps: objects, scripts,
* script source objects, and environments. They have the property that all
* their values are in the same compartment as the Debugger object, but we have
* to mark the keys and the private pointer in the wrapper object.
*
* We must scan all Debugger objects regardless of whether they *currently* have
* any debuggees in a compartment being GC'd, because the WeakMap entries
* persist even when debuggees are removed.
*
* This happens during the initial mark phase, not iterative marking, because
* all the edges being reported here are strong references.
*
* This method is also used during compacting GC to update cross compartment
* pointers in zones that are not currently being compacted.
*/
/* static */ void
Debugger::markIncomingCrossCompartmentEdges(JSTracer* trc)
{
JSRuntime* rt = trc->runtime();
gc::State state = rt->gc.state();
MOZ_ASSERT(state == gc::MARK_ROOTS || state == gc::COMPACT);
for (Debugger* dbg : rt->debuggerList) {
Zone* zone = dbg->object->zone();
if ((state == gc::MARK_ROOTS && !zone->isCollecting()) ||
(state == gc::COMPACT && !zone->isGCCompacting()))
{
dbg->markCrossCompartmentEdges(trc);
}
}
}
/*
* This method has two tasks:
* 1. Mark Debugger objects that are unreachable except for debugger hooks that
* may yet be called.
* 2. Mark breakpoint handlers.
*
* This happens during the iterative part of the GC mark phase. This method
* returns true if it has to mark anything; GC calls it repeatedly until it
* returns false.
*/
/* static */ bool
Debugger::markAllIteratively(GCMarker* trc)
{
bool markedAny = false;
/*
* Find all Debugger objects in danger of GC. This code is a little
* convoluted since the easiest way to find them is via their debuggees.
*/
JSRuntime* rt = trc->runtime();
for (CompartmentsIter c(rt, SkipAtoms); !c.done(); c.next()) {
if (c->isDebuggee()) {
GlobalObject* global = c->unsafeUnbarrieredMaybeGlobal();
if (!IsMarkedUnbarriered(&global))
continue;
/*
* Every debuggee has at least one debugger, so in this case
* getDebuggers can't return nullptr.
*/
const GlobalObject::DebuggerVector* debuggers = global->getDebuggers();
MOZ_ASSERT(debuggers);
for (Debugger * const* p = debuggers->begin(); p != debuggers->end(); p++) {
Debugger* dbg = *p;
/*
* dbg is a Debugger with at least one debuggee. Check three things:
* - dbg is actually in a compartment that is being marked
* - it isn't already marked
* - it actually has hooks that might be called
*/
HeapPtrNativeObject& dbgobj = dbg->toJSObjectRef();
if (!dbgobj->zone()->isGCMarking())
continue;
bool dbgMarked = IsMarked(&dbgobj);
if (!dbgMarked && dbg->hasAnyLiveHooks()) {
/*
* obj could be reachable only via its live, enabled
* debugger hooks, which may yet be called.
*/
TraceEdge(trc, &dbgobj, "enabled Debugger");
markedAny = true;
dbgMarked = true;
}
if (dbgMarked) {
/* Search for breakpoints to mark. */
for (Breakpoint* bp = dbg->firstBreakpoint(); bp; bp = bp->nextInDebugger()) {
if (IsMarkedUnbarriered(&bp->site->script)) {
/*
* The debugger and the script are both live.
* Therefore the breakpoint handler is live.
*/
if (!IsMarked(&bp->getHandlerRef())) {
TraceEdge(trc, &bp->getHandlerRef(), "breakpoint handler");
markedAny = true;
}
}
}
}
}
}
}
return markedAny;
}
/*
* Mark all debugger-owned GC things unconditionally. This is used by the minor
* GC: the minor GC cannot apply the weak constraints of the full GC because it
* visits only part of the heap.
*/
/* static */ void
Debugger::markAll(JSTracer* trc)
{
JSRuntime* rt = trc->runtime();
for (Debugger* dbg : rt->debuggerList) {
for (WeakGlobalObjectSet::Enum e(dbg->debuggees); !e.empty(); e.popFront())
TraceManuallyBarrieredEdge(trc, e.mutableFront().unsafeGet(), "Global Object");
HeapPtrNativeObject& dbgobj = dbg->toJSObjectRef();
TraceEdge(trc, &dbgobj, "Debugger Object");
dbg->scripts.trace(trc);
dbg->sources.trace(trc);
dbg->objects.trace(trc);
dbg->environments.trace(trc);
for (Breakpoint* bp = dbg->firstBreakpoint(); bp; bp = bp->nextInDebugger()) {
TraceManuallyBarrieredEdge(trc, &bp->site->script, "breakpoint script");
TraceEdge(trc, &bp->getHandlerRef(), "breakpoint handler");
}
}
}
/* static */ void
Debugger::traceObject(JSTracer* trc, JSObject* obj)
{
if (Debugger* dbg = Debugger::fromJSObject(obj))
dbg->trace(trc);
}
void
Debugger::trace(JSTracer* trc)
{
if (uncaughtExceptionHook)
TraceEdge(trc, &uncaughtExceptionHook, "hooks");
/*
* Mark Debugger.Frame objects. These are all reachable from JS, because the
* corresponding JS frames are still on the stack.
*
* (Once we support generator frames properly, we will need
* weakly-referenced Debugger.Frame objects as well, for suspended generator
* frames.)
*/
for (FrameMap::Range r = frames.all(); !r.empty(); r.popFront()) {
RelocatablePtrNativeObject& frameobj = r.front().value();
MOZ_ASSERT(MaybeForwarded(frameobj.get())->getPrivate());
TraceEdge(trc, &frameobj, "live Debugger.Frame");
}
AllocationsLog::trace(&allocationsLog, trc);
TenurePromotionsLog::trace(&tenurePromotionsLog, trc);
/* Trace the weak map from JSScript instances to Debugger.Script objects. */
scripts.trace(trc);
/* Trace the referent ->Debugger.Source weak map */
sources.trace(trc);
/* Trace the referent -> Debugger.Object weak map. */
objects.trace(trc);
/* Trace the referent -> Debugger.Environment weak map. */
environments.trace(trc);
}
/* static */ void
Debugger::sweepAll(FreeOp* fop)
{
JSRuntime* rt = fop->runtime();
for (Debugger* dbg : rt->debuggerList) {
if (IsAboutToBeFinalized(&dbg->object)) {
/*
* dbg is being GC'd. Detach it from its debuggees. The debuggee
* might be GC'd too. Since detaching requires access to both
* objects, this must be done before finalize time.
*/
for (WeakGlobalObjectSet::Enum e(dbg->debuggees); !e.empty(); e.popFront())
dbg->removeDebuggeeGlobal(fop, e.front().unbarrieredGet(), &e);
}
}
}
/* static */ void
Debugger::detachAllDebuggersFromGlobal(FreeOp* fop, GlobalObject* global)
{
const GlobalObject::DebuggerVector* debuggers = global->getDebuggers();
MOZ_ASSERT(!debuggers->empty());
while (!debuggers->empty())
debuggers->back()->removeDebuggeeGlobal(fop, global, nullptr);
}
/* static */ void
Debugger::findZoneEdges(Zone* zone, js::gc::ComponentFinder<Zone>& finder)
{
/*
* For debugger cross compartment wrappers, add edges in the opposite
* direction to those already added by JSCompartment::findOutgoingEdges.
* This ensure that debuggers and their debuggees are finalized in the same
* group.
*/
for (Debugger* dbg : zone->runtimeFromMainThread()->debuggerList) {
Zone* w = dbg->object->zone();
if (w == zone || !w->isGCMarking())
continue;
if (dbg->debuggeeZones.has(zone) ||
dbg->scripts.hasKeyInZone(zone) ||
dbg->sources.hasKeyInZone(zone) ||
dbg->objects.hasKeyInZone(zone) ||
dbg->environments.hasKeyInZone(zone))
{
finder.addEdgeTo(w);
}
}
}
/* static */ void
Debugger::finalize(FreeOp* fop, JSObject* obj)
{
Debugger* dbg = fromJSObject(obj);
if (!dbg)
return;
fop->delete_(dbg);
}
const Class Debugger::jsclass = {
"Debugger",
JSCLASS_HAS_PRIVATE |
JSCLASS_HAS_RESERVED_SLOTS(JSSLOT_DEBUG_COUNT),
nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, nullptr, Debugger::finalize,
nullptr, /* call */
nullptr, /* hasInstance */
nullptr, /* construct */
Debugger::traceObject
};
/* static */ Debugger*
Debugger::fromThisValue(JSContext* cx, const CallArgs& args, const char* fnname)
{
JSObject* thisobj = NonNullObject(cx, args.thisv());
if (!thisobj)
return nullptr;
if (thisobj->getClass() != &Debugger::jsclass) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger", fnname, thisobj->getClass()->name);
return nullptr;
}
/*
* Forbid Debugger.prototype, which is of the Debugger JSClass but isn't
* really a Debugger object. The prototype object is distinguished by
* having a nullptr private value.
*/
Debugger* dbg = fromJSObject(thisobj);
if (!dbg) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger", fnname, "prototype object");
}
return dbg;
}
#define THIS_DEBUGGER(cx, argc, vp, fnname, args, dbg) \
CallArgs args = CallArgsFromVp(argc, vp); \
Debugger* dbg = Debugger::fromThisValue(cx, args, fnname); \
if (!dbg) \
return false
/* static */ bool
Debugger::getEnabled(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "get enabled", args, dbg);
args.rval().setBoolean(dbg->enabled);
return true;
}
/* static */ bool
Debugger::setEnabled(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "set enabled", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.set enabled", 1))
return false;
bool wasEnabled = dbg->enabled;
dbg->enabled = ToBoolean(args[0]);
if (wasEnabled != dbg->enabled) {
if (dbg->trackingAllocationSites) {
if (wasEnabled) {
dbg->removeAllocationsTrackingForAllDebuggees();
} else {
if (!dbg->addAllocationsTrackingForAllDebuggees(cx)) {
dbg->enabled = false;
return false;
}
}
}
for (Breakpoint* bp = dbg->firstBreakpoint(); bp; bp = bp->nextInDebugger()) {
if (!wasEnabled)
bp->site->inc(cx->runtime()->defaultFreeOp());
else
bp->site->dec(cx->runtime()->defaultFreeOp());
}
/*
* Add or remove ourselves from the runtime's list of Debuggers
* that care about new globals.
*/
if (dbg->getHook(OnNewGlobalObject)) {
if (!wasEnabled) {
/* If we were not enabled, the link should be a singleton list. */
MOZ_ASSERT(JS_CLIST_IS_EMPTY(&dbg->onNewGlobalObjectWatchersLink));
JS_APPEND_LINK(&dbg->onNewGlobalObjectWatchersLink,
&cx->runtime()->onNewGlobalObjectWatchers);
} else {
/* If we were enabled, the link should be inserted in the list. */
MOZ_ASSERT(!JS_CLIST_IS_EMPTY(&dbg->onNewGlobalObjectWatchersLink));
JS_REMOVE_AND_INIT_LINK(&dbg->onNewGlobalObjectWatchersLink);
}
}
// Ensure the compartment is observable if we are re-enabling a
// Debugger with hooks that observe all execution.
if (!dbg->updateObservesAllExecutionOnDebuggees(cx, dbg->observesAllExecution()))
return false;
// Note: To toogle code coverage, we currently need to have no live
// stack frame, thus the coverage does not depend on the enabled flag.
dbg->updateObservesAsmJSOnDebuggees(dbg->observesAsmJS());
}
args.rval().setUndefined();
return true;
}
/* static */ bool
Debugger::getHookImpl(JSContext* cx, CallArgs& args, Debugger& dbg, Hook which)
{
MOZ_ASSERT(which >= 0 && which < HookCount);
args.rval().set(dbg.object->getReservedSlot(JSSLOT_DEBUG_HOOK_START + which));
return true;
}
/* static */ bool
Debugger::setHookImpl(JSContext* cx, CallArgs& args, Debugger& dbg, Hook which)
{
MOZ_ASSERT(which >= 0 && which < HookCount);
if (!args.requireAtLeast(cx, "Debugger.setHook", 1))
return false;
if (args[0].isObject()) {
if (!args[0].toObject().isCallable())
return ReportIsNotFunction(cx, args[0], args.length() - 1);
} else if (!args[0].isUndefined()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_CALLABLE_OR_UNDEFINED);
return false;
}
dbg.object->setReservedSlot(JSSLOT_DEBUG_HOOK_START + which, args[0]);
if (hookObservesAllExecution(which)) {
if (!dbg.updateObservesAllExecutionOnDebuggees(cx, dbg.observesAllExecution()))
return false;
}
args.rval().setUndefined();
return true;
}
/* static */ bool
Debugger::getOnDebuggerStatement(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(get onDebuggerStatement)", args, dbg);
return getHookImpl(cx, args, *dbg, OnDebuggerStatement);
}
/* static */ bool
Debugger::setOnDebuggerStatement(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(set onDebuggerStatement)", args, dbg);
return setHookImpl(cx, args, *dbg, OnDebuggerStatement);
}
/* static */ bool
Debugger::getOnExceptionUnwind(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(get onExceptionUnwind)", args, dbg);
return getHookImpl(cx, args, *dbg, OnExceptionUnwind);
}
/* static */ bool
Debugger::setOnExceptionUnwind(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(set onExceptionUnwind)", args, dbg);
return setHookImpl(cx, args, *dbg, OnExceptionUnwind);
}
/* static */ bool
Debugger::getOnNewScript(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(get onNewScript)", args, dbg);
return getHookImpl(cx, args, *dbg, OnNewScript);
}
/* static */ bool
Debugger::setOnNewScript(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(set onNewScript)", args, dbg);
return setHookImpl(cx, args, *dbg, OnNewScript);
}
/* static */ bool
Debugger::getOnNewPromise(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(get onNewPromise)", args, dbg);
return getHookImpl(cx, args, *dbg, OnNewPromise);
}
/* static */ bool
Debugger::setOnNewPromise(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(set onNewPromise)", args, dbg);
return setHookImpl(cx, args, *dbg, OnNewPromise);
}
/* static */ bool
Debugger::getOnPromiseSettled(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(get onPromiseSettled)", args, dbg);
return getHookImpl(cx, args, *dbg, OnPromiseSettled);
}
/* static */ bool
Debugger::setOnPromiseSettled(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(set onPromiseSettled)", args, dbg);
return setHookImpl(cx, args, *dbg, OnPromiseSettled);
}
/* static */ bool
Debugger::getOnEnterFrame(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(get onEnterFrame)", args, dbg);
return getHookImpl(cx, args, *dbg, OnEnterFrame);
}
/* static */ bool
Debugger::setOnEnterFrame(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(set onEnterFrame)", args, dbg);
return setHookImpl(cx, args, *dbg, OnEnterFrame);
}
/* static */ bool
Debugger::getOnNewGlobalObject(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(get onNewGlobalObject)", args, dbg);
return getHookImpl(cx, args, *dbg, OnNewGlobalObject);
}
/* static */ bool
Debugger::setOnNewGlobalObject(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "setOnNewGlobalObject", args, dbg);
RootedObject oldHook(cx, dbg->getHook(OnNewGlobalObject));
if (!setHookImpl(cx, args, *dbg, OnNewGlobalObject))
return false;
/*
* Add or remove ourselves from the runtime's list of Debuggers that
* care about new globals.
*/
if (dbg->enabled) {
JSObject* newHook = dbg->getHook(OnNewGlobalObject);
if (!oldHook && newHook) {
/* If we didn't have a hook, the link should be a singleton list. */
MOZ_ASSERT(JS_CLIST_IS_EMPTY(&dbg->onNewGlobalObjectWatchersLink));
JS_APPEND_LINK(&dbg->onNewGlobalObjectWatchersLink,
&cx->runtime()->onNewGlobalObjectWatchers);
} else if (oldHook && !newHook) {
/* If we did have a hook, the link should be inserted in the list. */
MOZ_ASSERT(!JS_CLIST_IS_EMPTY(&dbg->onNewGlobalObjectWatchersLink));
JS_REMOVE_AND_INIT_LINK(&dbg->onNewGlobalObjectWatchersLink);
}
}
return true;
}
/* static */ bool
Debugger::getUncaughtExceptionHook(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "get uncaughtExceptionHook", args, dbg);
args.rval().setObjectOrNull(dbg->uncaughtExceptionHook);
return true;
}
/* static */ bool
Debugger::setUncaughtExceptionHook(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "set uncaughtExceptionHook", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.set uncaughtExceptionHook", 1))
return false;
if (!args[0].isNull() && (!args[0].isObject() || !args[0].toObject().isCallable())) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_ASSIGN_FUNCTION_OR_NULL,
"uncaughtExceptionHook");
return false;
}
dbg->uncaughtExceptionHook = args[0].toObjectOrNull();
args.rval().setUndefined();
return true;
}
/* static */ bool
Debugger::getAllowUnobservedAsmJS(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "get allowUnobservedAsmJS", args, dbg);
args.rval().setBoolean(dbg->allowUnobservedAsmJS);
return true;
}
/* static */ bool
Debugger::setAllowUnobservedAsmJS(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "set allowUnobservedAsmJS", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.set allowUnobservedAsmJS", 1))
return false;
dbg->allowUnobservedAsmJS = ToBoolean(args[0]);
for (WeakGlobalObjectSet::Range r = dbg->debuggees.all(); !r.empty(); r.popFront()) {
GlobalObject* global = r.front();
JSCompartment* comp = global->compartment();
comp->updateDebuggerObservesAsmJS();
}
args.rval().setUndefined();
return true;
}
/* static */ bool
Debugger::getCollectCoverageInfo(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "get collectCoverageInfo", args, dbg);
args.rval().setBoolean(dbg->collectCoverageInfo);
return true;
}
/* static */ bool
Debugger::setCollectCoverageInfo(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "set collectCoverageInfo", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.set collectCoverageInfo", 1))
return false;
dbg->collectCoverageInfo = ToBoolean(args[0]);
IsObserving observing = dbg->collectCoverageInfo ? Observing : NotObserving;
if (!dbg->updateObservesCoverageOnDebuggees(cx, observing))
return false;
args.rval().setUndefined();
return true;
}
/* static */ bool
Debugger::getMemory(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "get memory", args, dbg);
Value memoryValue = dbg->object->getReservedSlot(JSSLOT_DEBUG_MEMORY_INSTANCE);
if (!memoryValue.isObject()) {
RootedObject memory(cx, DebuggerMemory::create(cx, dbg));
if (!memory)
return false;
memoryValue = ObjectValue(*memory);
}
args.rval().set(memoryValue);
return true;
}
/* static */ bool
Debugger::getOnIonCompilation(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(get onIonCompilation)", args, dbg);
return getHookImpl(cx, args, *dbg, OnIonCompilation);
}
/* static */ bool
Debugger::setOnIonCompilation(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "(set onIonCompilation)", args, dbg);
return setHookImpl(cx, args, *dbg, OnIonCompilation);
}
/*
* Given a value used to designate a global (there's quite a variety; see the
* docs), return the actual designee.
*
* Note that this does not check whether the designee is marked "invisible to
* Debugger" or not; different callers need to handle invisible-to-Debugger
* globals in different ways.
*/
GlobalObject*
Debugger::unwrapDebuggeeArgument(JSContext* cx, const Value& v)
{
if (!v.isObject()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
"argument", "not a global object");
return nullptr;
}
RootedObject obj(cx, &v.toObject());
/* If it's a Debugger.Object belonging to this debugger, dereference that. */
if (obj->getClass() == &DebuggerObject_class) {
RootedValue rv(cx, v);
if (!unwrapDebuggeeValue(cx, &rv))
return nullptr;
obj = &rv.toObject();
}
/* If we have a cross-compartment wrapper, dereference as far as is secure. */
obj = CheckedUnwrap(obj);
if (!obj) {
JS_ReportError(cx, "Permission denied to access object");
return nullptr;
}
/* If that produced a WindowProxy, get the Window (global). */
obj = ToWindowIfWindowProxy(obj);
/* If that didn't produce a global object, it's an error. */
if (!obj->is<GlobalObject>()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
"argument", "not a global object");
return nullptr;
}
return &obj->as<GlobalObject>();
}
/* static */ bool
Debugger::addDebuggee(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "addDebuggee", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.addDebuggee", 1))
return false;
Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
if (!global)
return false;
if (!dbg->addDebuggeeGlobal(cx, global))
return false;
RootedValue v(cx, ObjectValue(*global));
if (!dbg->wrapDebuggeeValue(cx, &v))
return false;
args.rval().set(v);
return true;
}
/* static */ bool
Debugger::addAllGlobalsAsDebuggees(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "addAllGlobalsAsDebuggees", args, dbg);
for (ZonesIter zone(cx->runtime(), SkipAtoms); !zone.done(); zone.next()) {
for (CompartmentsInZoneIter c(zone); !c.done(); c.next()) {
if (c == dbg->object->compartment() || c->options().invisibleToDebugger())
continue;
c->scheduledForDestruction = false;
GlobalObject* global = c->maybeGlobal();
if (global) {
Rooted<GlobalObject*> rg(cx, global);
if (!dbg->addDebuggeeGlobal(cx, rg))
return false;
}
}
}
args.rval().setUndefined();
return true;
}
/* static */ bool
Debugger::removeDebuggee(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "removeDebuggee", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.removeDebuggee", 1))
return false;
Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
if (!global)
return false;
ExecutionObservableCompartments obs(cx);
if (!obs.init())
return false;
if (dbg->debuggees.has(global)) {
dbg->removeDebuggeeGlobal(cx->runtime()->defaultFreeOp(), global, nullptr);
// Only update the compartment if there are no Debuggers left, as it's
// expensive to check if no other Debugger has a live script or frame hook
// on any of the current on-stack debuggee frames.
if (global->getDebuggers()->empty() && !obs.add(global->compartment()))
return false;
if (!updateExecutionObservability(cx, obs, NotObserving))
return false;
}
args.rval().setUndefined();
return true;
}
/* static */ bool
Debugger::removeAllDebuggees(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "removeAllDebuggees", args, dbg);
ExecutionObservableCompartments obs(cx);
if (!obs.init())
return false;
for (WeakGlobalObjectSet::Enum e(dbg->debuggees); !e.empty(); e.popFront()) {
Rooted<GlobalObject*> global(cx, e.front());
dbg->removeDebuggeeGlobal(cx->runtime()->defaultFreeOp(), global, &e);
// See note about adding to the observable set in removeDebuggee.
if (global->getDebuggers()->empty() && !obs.add(global->compartment()))
return false;
}
if (!updateExecutionObservability(cx, obs, NotObserving))
return false;
args.rval().setUndefined();
return true;
}
/* static */ bool
Debugger::hasDebuggee(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "hasDebuggee", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.hasDebuggee", 1))
return false;
GlobalObject* global = dbg->unwrapDebuggeeArgument(cx, args[0]);
if (!global)
return false;
args.rval().setBoolean(!!dbg->debuggees.lookup(global));
return true;
}
/* static */ bool
Debugger::getDebuggees(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "getDebuggees", args, dbg);
// Obtain the list of debuggees before wrapping each debuggee, as a GC could
// update the debuggees set while we are iterating it.
unsigned count = dbg->debuggees.count();
AutoValueVector debuggees(cx);
if (!debuggees.resize(count))
return false;
unsigned i = 0;
{
JS::AutoCheckCannotGC nogc;
for (WeakGlobalObjectSet::Enum e(dbg->debuggees); !e.empty(); e.popFront())
debuggees[i++].setObject(*e.front().get());
}
RootedArrayObject arrobj(cx, NewDenseFullyAllocatedArray(cx, count));
if (!arrobj)
return false;
arrobj->ensureDenseInitializedLength(cx, 0, count);
for (i = 0; i < count; i++) {
RootedValue v(cx, debuggees[i]);
if (!dbg->wrapDebuggeeValue(cx, &v))
return false;
arrobj->setDenseElement(i, v);
}
args.rval().setObject(*arrobj);
return true;
}
/* static */ bool
Debugger::getNewestFrame(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "getNewestFrame", args, dbg);
/* Since there may be multiple contexts, use AllFramesIter. */
for (AllFramesIter i(cx); !i.done(); ++i) {
if (dbg->observesFrame(i)) {
// Ensure that Ion frames are rematerialized. Only rematerialized
// Ion frames may be used as AbstractFramePtrs.
if (i.isIon() && !i.ensureHasRematerializedFrame(cx))
return false;
AbstractFramePtr frame = i.abstractFramePtr();
ScriptFrameIter iter(i.activation()->cx(), ScriptFrameIter::GO_THROUGH_SAVED);
while (!iter.hasUsableAbstractFramePtr() || iter.abstractFramePtr() != frame)
++iter;
return dbg->getScriptFrame(cx, iter, args.rval());
}
}
args.rval().setNull();
return true;
}
/* static */ bool
Debugger::clearAllBreakpoints(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "clearAllBreakpoints", args, dbg);
for (WeakGlobalObjectSet::Range r = dbg->debuggees.all(); !r.empty(); r.popFront())
r.front()->compartment()->clearBreakpointsIn(cx->runtime()->defaultFreeOp(),
dbg, nullptr);
return true;
}
/* static */ bool
Debugger::construct(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
/* Check that the arguments, if any, are cross-compartment wrappers. */
for (unsigned i = 0; i < args.length(); i++) {
JSObject* argobj = NonNullObject(cx, args[i]);
if (!argobj)
return false;
if (!argobj->is<CrossCompartmentWrapperObject>()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_CCW_REQUIRED,
"Debugger");
return false;
}
}
/* Get Debugger.prototype. */
RootedValue v(cx);
RootedObject callee(cx, &args.callee());
if (!GetProperty(cx, callee, callee, cx->names().prototype, &v))
return false;
RootedNativeObject proto(cx, &v.toObject().as<NativeObject>());
MOZ_ASSERT(proto->getClass() == &Debugger::jsclass);
/*
* Make the new Debugger object. Each one has a reference to
* Debugger.{Frame,Object,Script,Memory}.prototype in reserved slots. The
* rest of the reserved slots are for hooks; they default to undefined.
*/
RootedNativeObject obj(cx, NewNativeObjectWithGivenProto(cx, &Debugger::jsclass, proto));
if (!obj)
return false;
for (unsigned slot = JSSLOT_DEBUG_PROTO_START; slot < JSSLOT_DEBUG_PROTO_STOP; slot++)
obj->setReservedSlot(slot, proto->getReservedSlot(slot));
obj->setReservedSlot(JSSLOT_DEBUG_MEMORY_INSTANCE, NullValue());
Debugger* debugger;
{
/* Construct the underlying C++ object. */
AutoInitGCManagedObject<Debugger> dbg(cx->make_unique<Debugger>(cx, obj.get()));
if (!dbg || !dbg->init(cx))
return false;
debugger = dbg.release();
obj->setPrivate(debugger); // owns the released pointer
}
/* Add the initial debuggees, if any. */
for (unsigned i = 0; i < args.length(); i++) {
Rooted<GlobalObject*>
debuggee(cx, &args[i].toObject().as<ProxyObject>().private_().toObject().global());
if (!debugger->addDebuggeeGlobal(cx, debuggee))
return false;
}
args.rval().setObject(*obj);
return true;
}
bool
Debugger::addDebuggeeGlobal(JSContext* cx, Handle<GlobalObject*> global)
{
if (debuggees.has(global))
return true;
// Callers should generally be unable to get a reference to a debugger-
// invisible global in order to pass it to addDebuggee. But this is possible
// with certain testing aides we expose in the shell, so just make addDebuggee
// throw in that case.
JSCompartment* debuggeeCompartment = global->compartment();
if (debuggeeCompartment->options().invisibleToDebugger()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_DEBUG_CANT_DEBUG_GLOBAL);
return false;
}
/*
* Check for cycles. If global's compartment is reachable from this
* Debugger object's compartment by following debuggee-to-debugger links,
* then adding global would create a cycle. (Typically nobody is debugging
* the debugger, in which case we zip through this code without looping.)
*/
Vector<JSCompartment*> visited(cx);
if (!visited.append(object->compartment()))
return false;
for (size_t i = 0; i < visited.length(); i++) {
JSCompartment* c = visited[i];
if (c == debuggeeCompartment) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_LOOP);
return false;
}
/*
* Find all compartments containing debuggers debugging c's global
* object. Add those compartments to visited.
*/
if (c->isDebuggee()) {
GlobalObject::DebuggerVector* v = c->maybeGlobal()->getDebuggers();
for (Debugger** p = v->begin(); p != v->end(); p++) {
JSCompartment* next = (*p)->object->compartment();
if (Find(visited, next) == visited.end() && !visited.append(next))
return false;
}
}
}
/*
* For global to become this js::Debugger's debuggee:
*
* 1. this js::Debugger must be in global->getDebuggers(),
* 2. global must be in this->debuggees,
* 3. it must be in zone->getDebuggers(),
* 4. the debuggee's zone must be in this->debuggeeZones,
* 5. if we are tracking allocations, the SavedStacksMetadataCallback must be
* installed for this compartment, and
* 6. JSCompartment::isDebuggee()'s bit must be set.
*
* All six indications must be kept consistent.
*/
AutoCompartment ac(cx, global);
Zone* zone = global->zone();
// (1)
auto* globalDebuggers = GlobalObject::getOrCreateDebuggers(cx, global);
if (!globalDebuggers)
return false;
if (!globalDebuggers->append(this)) {
ReportOutOfMemory(cx);
return false;
}
auto globalDebuggersGuard = MakeScopeExit([&] {
globalDebuggers->popBack();
});
// (2)
if (!debuggees.put(global)) {
ReportOutOfMemory(cx);
return false;
}
auto debuggeesGuard = MakeScopeExit([&] {
debuggees.remove(global);
});
bool addingZoneRelation = !debuggeeZones.has(zone);
// (3)
auto* zoneDebuggers = zone->getOrCreateDebuggers(cx);
if (!zoneDebuggers)
return false;
if (addingZoneRelation && !zoneDebuggers->append(this)) {
ReportOutOfMemory(cx);
return false;
}
auto zoneDebuggersGuard = MakeScopeExit([&] {
if (addingZoneRelation)
zoneDebuggers->popBack();
});
// (4)
if (addingZoneRelation && !debuggeeZones.put(zone)) {
ReportOutOfMemory(cx);
return false;
}
auto debuggeeZonesGuard = MakeScopeExit([&] {
if (addingZoneRelation)
debuggeeZones.remove(zone);
});
// (5)
if (trackingAllocationSites && enabled && !Debugger::addAllocationsTracking(cx, global))
return false;
auto allocationsTrackingGuard = MakeScopeExit([&] {
if (trackingAllocationSites && enabled)
Debugger::removeAllocationsTracking(*global);
});
// (6)
debuggeeCompartment->setIsDebuggee();
debuggeeCompartment->updateDebuggerObservesAsmJS();
debuggeeCompartment->updateDebuggerObservesCoverage();
if (observesAllExecution() && !ensureExecutionObservabilityOfCompartment(cx, debuggeeCompartment))
return false;
globalDebuggersGuard.release();
debuggeesGuard.release();
zoneDebuggersGuard.release();
debuggeeZonesGuard.release();
allocationsTrackingGuard.release();
return true;
}
void
Debugger::recomputeDebuggeeZoneSet()
{
AutoEnterOOMUnsafeRegion oomUnsafe;
debuggeeZones.clear();
for (auto range = debuggees.all(); !range.empty(); range.popFront()) {
if (!debuggeeZones.put(range.front().unbarrieredGet()->zone()))
oomUnsafe.crash("Debugger::removeDebuggeeGlobal");
}
}
template<typename V>
static Debugger**
findDebuggerInVector(Debugger* dbg, V* vec)
{
Debugger** p;
for (p = vec->begin(); p != vec->end(); p++) {
if (*p == dbg)
break;
}
MOZ_ASSERT(p != vec->end());
return p;
}
void
Debugger::removeDebuggeeGlobal(FreeOp* fop, GlobalObject* global,
WeakGlobalObjectSet::Enum* debugEnum)
{
/*
* The caller might have found global by enumerating this->debuggees; if
* so, use HashSet::Enum::removeFront rather than HashSet::remove below,
* to avoid invalidating the live enumerator.
*/
MOZ_ASSERT(debuggees.has(global));
MOZ_ASSERT(debuggeeZones.has(global->zone()));
MOZ_ASSERT_IF(debugEnum, debugEnum->front().unbarrieredGet() == global);
/*
* FIXME Debugger::slowPathOnLeaveFrame needs to kill all Debugger.Frame
* objects referring to a particular JS stack frame. This is hard if
* Debugger objects that are no longer debugging the relevant global might
* have live Frame objects. So we take the easy way out and kill them here.
* This is a bug, since it's observable and contrary to the spec. One
* possible fix would be to put such objects into a compartment-wide bag
* which slowPathOnLeaveFrame would have to examine.
*/
for (FrameMap::Enum e(frames); !e.empty(); e.popFront()) {
AbstractFramePtr frame = e.front().key();
NativeObject* frameobj = e.front().value();
if (&frame.script()->global() == global) {
DebuggerFrame_freeScriptFrameIterData(fop, frameobj);
DebuggerFrame_maybeDecrementFrameScriptStepModeCount(fop, frame, frameobj);
e.removeFront();
}
}
auto *globalDebuggersVector = global->getDebuggers();
auto *zoneDebuggersVector = global->zone()->getDebuggers();
/*
* The relation must be removed from up to three places:
* globalDebuggersVector and debuggees for sure, and possibly the
* compartment's debuggee set.
*
* The debuggee zone set is recomputed on demand. This avoids refcounting
* and in practice we have relatively few debuggees that tend to all be in
* the same zone. If after recomputing the debuggee zone set, this global's
* zone is not in the set, then we must remove ourselves from the zone's
* vector of observing debuggers.
*/
globalDebuggersVector->erase(findDebuggerInVector(this, globalDebuggersVector));
if (debugEnum)
debugEnum->removeFront();
else
debuggees.remove(global);
recomputeDebuggeeZoneSet();
if (!debuggeeZones.has(global->zone()))
zoneDebuggersVector->erase(findDebuggerInVector(this, zoneDebuggersVector));
/* Remove all breakpoints for the debuggee. */
Breakpoint* nextbp;
for (Breakpoint* bp = firstBreakpoint(); bp; bp = nextbp) {
nextbp = bp->nextInDebugger();
if (bp->site->script->compartment() == global->compartment())
bp->destroy(fop);
}
MOZ_ASSERT_IF(debuggees.empty(), !firstBreakpoint());
/*
* If we are tracking allocation sites, we need to remove the object
* metadata callback from this global's compartment.
*/
if (trackingAllocationSites)
Debugger::removeAllocationsTracking(*global);
if (global->getDebuggers()->empty()) {
global->compartment()->unsetIsDebuggee();
} else {
global->compartment()->updateDebuggerObservesAllExecution();
global->compartment()->updateDebuggerObservesAsmJS();
global->compartment()->updateDebuggerObservesCoverage();
}
}
static inline ScriptSourceObject* GetSourceReferent(JSObject* obj);
/*
* A class for parsing 'findScripts' query arguments and searching for
* scripts that match the criteria they represent.
*/
class MOZ_STACK_CLASS Debugger::ScriptQuery
{
public:
/* Construct a ScriptQuery to use matching scripts for |dbg|. */
ScriptQuery(JSContext* cx, Debugger* dbg):
cx(cx), debugger(dbg), compartments(cx->runtime()), url(cx), displayURLString(cx),
source(cx), innermostForCompartment(cx->runtime()), vector(cx, ScriptVector(cx))
{}
/*
* Initialize this ScriptQuery. Raise an error and return false if we
* haven't enough memory.
*/
bool init() {
if (!compartments.init() ||
!innermostForCompartment.init())
{
ReportOutOfMemory(cx);
return false;
}
return true;
}
/*
* Parse the query object |query|, and prepare to match only the scripts
* it specifies.
*/
bool parseQuery(HandleObject query) {
/*
* Check for a 'global' property, which limits the results to those
* scripts scoped to a particular global object.
*/
RootedValue global(cx);
if (!GetProperty(cx, query, query, cx->names().global, &global))
return false;
if (global.isUndefined()) {
matchAllDebuggeeGlobals();
} else {
GlobalObject* globalObject = debugger->unwrapDebuggeeArgument(cx, global);
if (!globalObject)
return false;
/*
* If the given global isn't a debuggee, just leave the set of
* acceptable globals empty; we'll return no scripts.
*/
if (debugger->debuggees.has(globalObject)) {
if (!matchSingleGlobal(globalObject))
return false;
}
}
/* Check for a 'url' property. */
if (!GetProperty(cx, query, query, cx->names().url, &url))
return false;
if (!url.isUndefined() && !url.isString()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
"query object's 'url' property", "neither undefined nor a string");
return false;
}
/* Check for a 'source' property */
RootedValue debuggerSource(cx);
if (!GetProperty(cx, query, query, cx->names().source, &debuggerSource))
return false;
if (!debuggerSource.isUndefined()) {
if (!debuggerSource.isObject() ||
debuggerSource.toObject().getClass() != &DebuggerSource_class) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
"query object's 'source' property",
"not undefined nor a Debugger.Source object");
return false;
}
source = GetSourceReferent(&debuggerSource.toObject());
}
/* Check for a 'displayURL' property. */
RootedValue displayURL(cx);
if (!GetProperty(cx, query, query, cx->names().displayURL, &displayURL))
return false;
if (!displayURL.isUndefined() && !displayURL.isString()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
"query object's 'displayURL' property",
"neither undefined nor a string");
return false;
}
if (displayURL.isString()) {
displayURLString = displayURL.toString()->ensureLinear(cx);
if (!displayURLString)
return false;
}
/* Check for a 'line' property. */
RootedValue lineProperty(cx);
if (!GetProperty(cx, query, query, cx->names().line, &lineProperty))
return false;
if (lineProperty.isUndefined()) {
hasLine = false;
} else if (lineProperty.isNumber()) {
if (displayURL.isUndefined() && url.isUndefined() && !source) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_QUERY_LINE_WITHOUT_URL);
return false;
}
double doubleLine = lineProperty.toNumber();
if (doubleLine <= 0 || (unsigned int) doubleLine != doubleLine) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_BAD_LINE);
return false;
}
hasLine = true;
line = doubleLine;
} else {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
"query object's 'line' property",
"neither undefined nor an integer");
return false;
}
/* Check for an 'innermost' property. */
PropertyName* innermostName = cx->names().innermost;
RootedValue innermostProperty(cx);
if (!GetProperty(cx, query, query, innermostName, &innermostProperty))
return false;
innermost = ToBoolean(innermostProperty);
if (innermost) {
/* Technically, we need only check hasLine, but this is clearer. */
if ((displayURL.isUndefined() && url.isUndefined() && !source) || !hasLine) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_QUERY_INNERMOST_WITHOUT_LINE_URL);
return false;
}
}
return true;
}
/* Set up this ScriptQuery appropriately for a missing query argument. */
bool omittedQuery() {
url.setUndefined();
hasLine = false;
innermost = false;
displayURLString = nullptr;
return matchAllDebuggeeGlobals();
}
/*
* Search all relevant compartments and the stack for scripts matching
* this query, and append the matching scripts to |vector|.
*/
bool findScripts() {
if (!prepareQuery())
return false;
JSCompartment* singletonComp = nullptr;
if (compartments.count() == 1)
singletonComp = compartments.all().front();
/* Search each compartment for debuggee scripts. */
MOZ_ASSERT(vector.empty());
oom = false;
IterateScripts(cx->runtime(), singletonComp, this, considerScript);
if (oom) {
ReportOutOfMemory(cx);
return false;
}
/* We cannot touch the gray bits while isHeapBusy, so do this now. */
for (JSScript** i = vector.begin(); i != vector.end(); ++i)
JS::ExposeScriptToActiveJS(*i);
/*
* For most queries, we just accumulate results in 'vector' as we find
* them. But if this is an 'innermost' query, then we've accumulated the
* results in the 'innermostForCompartment' map. In that case, we now need to
* walk that map and populate 'vector'.
*/
if (innermost) {
for (CompartmentToScriptMap::Range r = innermostForCompartment.all();
!r.empty();
r.popFront())
{
JS::ExposeScriptToActiveJS(r.front().value());
if (!vector.append(r.front().value())) {
ReportOutOfMemory(cx);
return false;
}
}
}
return true;
}
Handle<ScriptVector> foundScripts() const {
return vector;
}
private:
/* The context in which we should do our work. */
JSContext* cx;
/* The debugger for which we conduct queries. */
Debugger* debugger;
typedef HashSet<JSCompartment*, DefaultHasher<JSCompartment*>, RuntimeAllocPolicy>
CompartmentSet;
/* A script must be in one of these compartments to match the query. */
CompartmentSet compartments;
/* If this is a string, matching scripts have urls equal to it. */
RootedValue url;
/* url as a C string. */
JSAutoByteString urlCString;
/* If this is a string, matching scripts' sources have displayURLs equal to
* it. */
RootedLinearString displayURLString;
/*
* If this is a source object, matching scripts will have sources
* equal to this instance.
*/
RootedScriptSource source;
/* True if the query contained a 'line' property. */
bool hasLine;
/* The line matching scripts must cover. */
unsigned int line;
/* True if the query has an 'innermost' property whose value is true. */
bool innermost;
typedef HashMap<JSCompartment*, JSScript*, DefaultHasher<JSCompartment*>, RuntimeAllocPolicy>
CompartmentToScriptMap;
/*
* For 'innermost' queries, a map from compartments to the innermost script
* we've seen so far in that compartment. (Template instantiation code size
* explosion ho!)
*/
CompartmentToScriptMap innermostForCompartment;
/*
* Accumulate the scripts in an Rooted<ScriptVector>, instead of creating
* the JS array as we go, because we mustn't allocate JS objects or GC
* while we use the CellIter.
*/
Rooted<ScriptVector> vector;
/* Indicates whether OOM has occurred while matching. */
bool oom;
bool addCompartment(JSCompartment* comp) {
{
// All scripts in the debuggee compartment must be visible, so
// delazify everything.
AutoCompartment ac(cx, comp);
if (!comp->ensureDelazifyScriptsForDebugger(cx))
return false;
}
return compartments.put(comp);
}
/* Arrange for this ScriptQuery to match only scripts that run in |global|. */
bool matchSingleGlobal(GlobalObject* global) {
MOZ_ASSERT(compartments.count() == 0);
if (!addCompartment(global->compartment())) {
ReportOutOfMemory(cx);
return false;
}
return true;
}
/*
* Arrange for this ScriptQuery to match all scripts running in debuggee
* globals.
*/
bool matchAllDebuggeeGlobals() {
MOZ_ASSERT(compartments.count() == 0);
/* Build our compartment set from the debugger's set of debuggee globals. */
for (WeakGlobalObjectSet::Range r = debugger->debuggees.all(); !r.empty(); r.popFront()) {
if (!addCompartment(r.front()->compartment())) {
ReportOutOfMemory(cx);
return false;
}
}
return true;
}
/*
* Given that parseQuery or omittedQuery has been called, prepare to match
* scripts. Set urlCString and displayURLChars as appropriate.
*/
bool prepareQuery() {
/* Compute urlCString and displayURLChars, if a url or displayURL was
* given respectively. */
if (url.isString()) {
if (!urlCString.encodeLatin1(cx, url.toString()))
return false;
}
return true;
}
static void considerScript(JSRuntime* rt, void* data, JSScript* script) {
ScriptQuery* self = static_cast<ScriptQuery*>(data);
self->consider(script);
}
/*
* If |script| matches this query, append it to |vector| or place it in
* |innermostForCompartment|, as appropriate. Set |oom| if an out of memory
* condition occurred.
*/
void consider(JSScript* script) {
// We check for presence of script->code() because it is possible that
// the script was created and thus exposed to GC, but *not* fully
// initialized from fullyInit{FromEmitter,Trivial} due to errors.
if (oom || script->selfHosted() || !script->code())
return;
JSCompartment* compartment = script->compartment();
if (!compartments.has(compartment))
return;
if (urlCString.ptr()) {
bool gotFilename = false;
if (script->filename() && strcmp(script->filename(), urlCString.ptr()) == 0)
gotFilename = true;
bool gotSourceURL = false;
if (!gotFilename && script->scriptSource()->introducerFilename() &&
strcmp(script->scriptSource()->introducerFilename(), urlCString.ptr()) == 0)
{
gotSourceURL = true;
}
if (!gotFilename && !gotSourceURL)
return;
}
if (hasLine) {
if (line < script->lineno() || script->lineno() + GetScriptLineExtent(script) < line)
return;
}
if (displayURLString) {
if (!script->scriptSource() || !script->scriptSource()->hasDisplayURL())
return;
const char16_t* s = script->scriptSource()->displayURL();
if (CompareChars(s, js_strlen(s), displayURLString) != 0)
return;
}
if (source && source != script->sourceObject())
return;
if (innermost) {
/*
* For 'innermost' queries, we don't place scripts in |vector| right
* away; we may later find another script that is nested inside this
* one. Instead, we record the innermost script we've found so far
* for each compartment in innermostForCompartment, and only
* populate |vector| at the bottom of findScripts, when we've
* traversed all the scripts.
*
* So: check this script against the innermost one we've found so
* far (if any), as recorded in innermostForCompartment, and replace
* that if it's better.
*/
CompartmentToScriptMap::AddPtr p = innermostForCompartment.lookupForAdd(compartment);
if (p) {
/* Is our newly found script deeper than the last one we found? */
JSScript* incumbent = p->value();
if (StaticScopeChainLength(script->innermostStaticScope()) >
StaticScopeChainLength(incumbent->innermostStaticScope()))
{
p->value() = script;
}
} else {
/*
* This is the first matching script we've encountered for this
* compartment, so it is thus the innermost such script.
*/
if (!innermostForCompartment.add(p, compartment, script)) {
oom = true;
return;
}
}
} else {
/* Record this matching script in the results vector. */
if (!vector.append(script)) {
oom = true;
return;
}
}
return;
}
};
/* static */ bool
Debugger::findScripts(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "findScripts", args, dbg);
ScriptQuery query(cx, dbg);
if (!query.init())
return false;
if (args.length() >= 1) {
RootedObject queryObject(cx, NonNullObject(cx, args[0]));
if (!queryObject || !query.parseQuery(queryObject))
return false;
} else {
if (!query.omittedQuery())
return false;
}
if (!query.findScripts())
return false;
Handle<ScriptVector> scripts(query.foundScripts());
RootedArrayObject result(cx, NewDenseFullyAllocatedArray(cx, scripts.length()));
if (!result)
return false;
result->ensureDenseInitializedLength(cx, 0, scripts.length());
for (size_t i = 0; i < scripts.length(); i++) {
JSObject* scriptObject = dbg->wrapScript(cx, scripts[i]);
if (!scriptObject)
return false;
result->setDenseElement(i, ObjectValue(*scriptObject));
}
args.rval().setObject(*result);
return true;
}
/*
* A class for parsing 'findObjects' query arguments and searching for objects
* that match the criteria they represent.
*/
class MOZ_STACK_CLASS Debugger::ObjectQuery
{
public:
/* Construct an ObjectQuery to use matching scripts for |dbg|. */
ObjectQuery(JSContext* cx, Debugger* dbg) :
objects(cx), cx(cx), dbg(dbg), className(cx)
{ }
/* The vector that we are accumulating results in. */
AutoObjectVector objects;
/*
* Parse the query object |query|, and prepare to match only the objects it
* specifies.
*/
bool parseQuery(HandleObject query) {
/* Check for the 'class' property */
RootedValue cls(cx);
if (!GetProperty(cx, query, query, cx->names().class_, &cls))
return false;
if (!cls.isUndefined()) {
if (!cls.isString()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
"query object's 'class' property",
"neither undefined nor a string");
return false;
}
className = cls;
}
return true;
}
/* Set up this ObjectQuery appropriately for a missing query argument. */
void omittedQuery() {
className.setUndefined();
}
/*
* Traverse the heap to find all relevant objects and add them to the
* provided vector.
*/
bool findObjects() {
if (!prepareQuery())
return false;
{
/*
* We can't tolerate the GC moving things around while we're
* searching the heap. Check that nothing we do causes a GC.
*/
Maybe<JS::AutoCheckCannotGC> maybeNoGC;
RootedObject dbgObj(cx, dbg->object);
JS::ubi::RootList rootList(cx->runtime(), maybeNoGC);
if (!rootList.init(dbgObj)) {
ReportOutOfMemory(cx);
return false;
}
Traversal traversal(cx->runtime(), *this, maybeNoGC.ref());
if (!traversal.init()) {
ReportOutOfMemory(cx);
return false;
}
traversal.wantNames = false;
return traversal.addStart(JS::ubi::Node(&rootList)) &&
traversal.traverse();
}
}
/*
* |ubi::Node::BreadthFirst| interface.
*/
class NodeData {};
typedef JS::ubi::BreadthFirst<ObjectQuery> Traversal;
bool operator() (Traversal& traversal, JS::ubi::Node origin, const JS::ubi::Edge& edge,
NodeData*, bool first)
{
if (!first)
return true;
JS::ubi::Node referent = edge.referent;
/*
* Only follow edges within our set of debuggee compartments; we don't
* care about the heap's subgraphs outside of our debuggee compartments,
* so we abandon the referent. Either (1) there is not a path from this
* non-debuggee node back to a node in our debuggee compartments, and we
* don't need to follow edges to or from this node, or (2) there does
* exist some path from this non-debuggee node back to a node in our
* debuggee compartments. However, if that were true, then the incoming
* cross compartment edge back into a debuggee compartment is already
* listed as an edge in the RootList we started traversal with, and
* therefore we don't need to follow edges to or from this non-debuggee
* node.
*/
JSCompartment* comp = referent.compartment();
if (comp && !dbg->isDebuggeeUnbarriered(comp)) {
traversal.abandonReferent();
return true;
}
/*
* If the referent is an object and matches our query's restrictions,
* add it to the vector accumulating results. Skip objects that should
* never be exposed to JS, like ScopeObjects and internal functions.
*/
if (!referent.is<JSObject>() || referent.exposeToJS().isUndefined())
return true;
JSObject* obj = referent.as<JSObject>();
if (!className.isUndefined()) {
const char* objClassName = obj->getClass()->name;
if (strcmp(objClassName, classNameCString.ptr()) != 0)
return true;
}
return objects.append(obj);
}
private:
/* The context in which we should do our work. */
JSContext* cx;
/* The debugger for which we conduct queries. */
Debugger* dbg;
/*
* If this is non-null, matching objects will have a class whose name is
* this property.
*/
RootedValue className;
/* The className member, as a C string. */
JSAutoByteString classNameCString;
/*
* Given that either omittedQuery or parseQuery has been called, prepare the
* query for matching objects.
*/
bool prepareQuery() {
if (className.isString()) {
if (!classNameCString.encodeLatin1(cx, className.toString()))
return false;
}
return true;
}
};
bool
Debugger::findObjects(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "findObjects", args, dbg);
ObjectQuery query(cx, dbg);
if (args.length() >= 1) {
RootedObject queryObject(cx, NonNullObject(cx, args[0]));
if (!queryObject || !query.parseQuery(queryObject))
return false;
} else {
query.omittedQuery();
}
if (!query.findObjects())
return false;
size_t length = query.objects.length();
RootedArrayObject result(cx, NewDenseFullyAllocatedArray(cx, length));
if (!result)
return false;
result->ensureDenseInitializedLength(cx, 0, length);
for (size_t i = 0; i < length; i++) {
RootedValue debuggeeVal(cx, ObjectValue(*query.objects[i]));
if (!dbg->wrapDebuggeeValue(cx, &debuggeeVal))
return false;
result->setDenseElement(i, debuggeeVal);
}
args.rval().setObject(*result);
return true;
}
/* static */ bool
Debugger::findAllGlobals(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "findAllGlobals", args, dbg);
AutoObjectVector globals(cx);
{
// Accumulate the list of globals before wrapping them, because
// wrapping can GC and collect compartments from under us, while
// iterating.
JS::AutoCheckCannotGC nogc;
for (CompartmentsIter c(cx->runtime(), SkipAtoms); !c.done(); c.next()) {
if (c->options().invisibleToDebugger())
continue;
c->scheduledForDestruction = false;
GlobalObject* global = c->maybeGlobal();
if (cx->runtime()->isSelfHostingGlobal(global))
continue;
if (global) {
/*
* We pulled |global| out of nowhere, so it's possible that it was
* marked gray by XPConnect. Since we're now exposing it to JS code,
* we need to mark it black.
*/
JS::ExposeObjectToActiveJS(global);
if (!globals.append(global))
return false;
}
}
}
RootedObject result(cx, NewDenseEmptyArray(cx));
if (!result)
return false;
for (size_t i = 0; i < globals.length(); i++) {
RootedValue globalValue(cx, ObjectValue(*globals[i]));
if (!dbg->wrapDebuggeeValue(cx, &globalValue))
return false;
if (!NewbornArrayPush(cx, result, globalValue))
return false;
}
args.rval().setObject(*result);
return true;
}
/* static */ bool
Debugger::makeGlobalObjectReference(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "makeGlobalObjectReference", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.makeGlobalObjectReference", 1))
return false;
Rooted<GlobalObject*> global(cx, dbg->unwrapDebuggeeArgument(cx, args[0]));
if (!global)
return false;
// If we create a D.O referring to a global in an invisible compartment,
// then from it we can reach function objects, scripts, environments, etc.,
// none of which we're ever supposed to see.
JSCompartment* globalCompartment = global->compartment();
if (globalCompartment->options().invisibleToDebugger()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_DEBUG_INVISIBLE_COMPARTMENT);
return false;
}
args.rval().setObject(*global);
return dbg->wrapDebuggeeValue(cx, args.rval());
}
static bool
DefineProperty(JSContext* cx, HandleObject obj, HandleId id, const char* value, size_t n)
{
JSString* text = JS_NewStringCopyN(cx, value, n);
if (!text)
return false;
RootedValue str(cx, StringValue(text));
return JS_DefinePropertyById(cx, obj, id, str, JSPROP_ENUMERATE);
}
#ifdef JS_TRACE_LOGGING
# ifdef NIGHTLY_BUILD
bool
Debugger::setupTraceLogger(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "setupTraceLogger", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.setupTraceLogger", 1))
return false;
RootedObject obj(cx, ToObject(cx, args[0]));
if (!obj)
return false;
AutoIdVector ids(cx);
if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY, &ids))
return false;
if (ids.length() == 0) {
args.rval().setBoolean(true);
return true;
}
Vector<uint32_t> textIds(cx);
if (!textIds.reserve(ids.length()))
return false;
Vector<bool> values(cx);
if (!values.reserve(ids.length()))
return false;
for (size_t i = 0; i < ids.length(); i++) {
if (!JSID_IS_STRING(ids[i])) {
args.rval().setBoolean(false);
return true;
}
JSString* id = JSID_TO_STRING(ids[i]);
JSLinearString* linear = id->ensureLinear(cx);
if (!linear)
return false;
uint32_t textId = TLStringToTextId(linear);
if (!TLTextIdIsToggable(textId)) {
args.rval().setBoolean(false);
return true;
}
RootedValue v(cx);
if (!GetProperty(cx, obj, obj, ids[i], &v))
return false;
textIds.infallibleAppend(textId);
values.infallibleAppend(ToBoolean(v));
}
MOZ_ASSERT(ids.length() == textIds.length());
MOZ_ASSERT(textIds.length() == values.length());
for (size_t i = 0; i < textIds.length(); i++) {
if (values[i])
TraceLogEnableTextId(cx, textIds[i]);
else
TraceLogDisableTextId(cx, textIds[i]);
}
args.rval().setBoolean(true);
return true;
}
bool
Debugger::drainTraceLogger(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "drainTraceLogger", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.drainTraceLogger", 0))
return false;
size_t num;
TraceLoggerThread* logger = TraceLoggerForMainThread(cx->runtime());
bool lostEvents = logger->lostEvents(dbg->traceLoggerLastDrainedIteration,
dbg->traceLoggerLastDrainedSize);
EventEntry* events = logger->getEventsStartingAt(&dbg->traceLoggerLastDrainedIteration,
&dbg->traceLoggerLastDrainedSize,
&num);
RootedObject array(cx, NewDenseEmptyArray(cx));
JSAtom* dataAtom = Atomize(cx, "data", strlen("data"));
if (!dataAtom)
return false;
RootedId dataId(cx, AtomToId(dataAtom));
/* Add all events to the array. */
uint32_t index = 0;
for (EventEntry* eventItem = events; eventItem < events + num; eventItem++, index++) {
RootedObject item(cx, NewObjectWithGivenProto(cx, &PlainObject::class_, nullptr));
if (!item)
return false;
const char* eventText = logger->eventText(eventItem->textId);
if (!DefineProperty(cx, item, dataId, eventText, strlen(eventText)))
return false;
RootedValue obj(cx, ObjectValue(*item));
if (!JS_DefineElement(cx, array, index, obj, JSPROP_ENUMERATE))
return false;
}
/* Add "lostEvents" indicating if there are events that were lost. */
RootedValue lost(cx, BooleanValue(lostEvents));
if (!JS_DefineProperty(cx, array, "lostEvents", lost, JSPROP_ENUMERATE))
return false;
args.rval().setObject(*array);
return true;
}
# endif // NIGHTLY_BUILD
bool
Debugger::setupTraceLoggerScriptCalls(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "setupTraceLoggerScriptCalls", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.setupTraceLoggerScriptCalls", 0))
return false;
TraceLogEnableTextId(cx, TraceLogger_Scripts);
TraceLogEnableTextId(cx, TraceLogger_InlinedScripts);
TraceLogDisableTextId(cx, TraceLogger_AnnotateScripts);
args.rval().setBoolean(true);
return true;
}
bool
Debugger::startTraceLogger(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "startTraceLogger", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.startTraceLogger", 0))
return false;
TraceLoggerThread* logger = TraceLoggerForMainThread(cx->runtime());
if (!TraceLoggerEnable(logger, cx))
return false;
args.rval().setUndefined();
return true;
}
bool
Debugger::endTraceLogger(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "endTraceLogger", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.endTraceLogger", 0))
return false;
TraceLoggerThread* logger = TraceLoggerForMainThread(cx->runtime());
TraceLoggerDisable(logger);
args.rval().setUndefined();
return true;
}
bool
Debugger::drainTraceLoggerScriptCalls(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGGER(cx, argc, vp, "drainTraceLoggerScriptCalls", args, dbg);
if (!args.requireAtLeast(cx, "Debugger.drainTraceLoggerScriptCalls", 0))
return false;
size_t num;
TraceLoggerThread* logger = TraceLoggerForMainThread(cx->runtime());
bool lostEvents = logger->lostEvents(dbg->traceLoggerScriptedCallsLastDrainedIteration,
dbg->traceLoggerScriptedCallsLastDrainedSize);
EventEntry* events = logger->getEventsStartingAt(
&dbg->traceLoggerScriptedCallsLastDrainedIteration,
&dbg->traceLoggerScriptedCallsLastDrainedSize,
&num);
RootedObject array(cx, NewDenseEmptyArray(cx));
RootedId fileNameId(cx, AtomToId(cx->names().fileName));
RootedId lineNumberId(cx, AtomToId(cx->names().lineNumber));
RootedId columnNumberId(cx, AtomToId(cx->names().columnNumber));
JSAtom* logTypeAtom = Atomize(cx, "logType", strlen("logType"));
if (!logTypeAtom)
return false;
RootedId logTypeId(cx, AtomToId(logTypeAtom));
/* Add all events to the array. */
uint32_t index = 0;
for (EventEntry* eventItem = events; eventItem < events + num; eventItem++) {
RootedObject item(cx, NewObjectWithGivenProto(cx, &PlainObject::class_, nullptr));
if (!item)
return false;
uint32_t textId = eventItem->textId;
if (textId != TraceLogger_Stop && !logger->textIdIsScriptEvent(textId))
continue;
const char* type = (textId == TraceLogger_Stop) ? "Stop" : "Script";
if (!DefineProperty(cx, item, logTypeId, type, strlen(type)))
return false;
if (textId != TraceLogger_Stop) {
const char* filename;
const char* lineno;
const char* colno;
size_t filename_len, lineno_len, colno_len;
logger->extractScriptDetails(textId, &filename, &filename_len, &lineno, &lineno_len,
&colno, &colno_len);
if (!DefineProperty(cx, item, fileNameId, filename, filename_len))
return false;
if (!DefineProperty(cx, item, lineNumberId, lineno, lineno_len))
return false;
if (!DefineProperty(cx, item, columnNumberId, colno, colno_len))
return false;
}
RootedValue obj(cx, ObjectValue(*item));
if (!JS_DefineElement(cx, array, index, obj, JSPROP_ENUMERATE))
return false;
index++;
}
/* Add "lostEvents" indicating if there are events that were lost. */
RootedValue lost(cx, BooleanValue(lostEvents));
if (!JS_DefineProperty(cx, array, "lostEvents", lost, JSPROP_ENUMERATE))
return false;
args.rval().setObject(*array);
return true;
}
#endif
const JSPropertySpec Debugger::properties[] = {
JS_PSGS("enabled", Debugger::getEnabled, Debugger::setEnabled, 0),
JS_PSGS("onDebuggerStatement", Debugger::getOnDebuggerStatement,
Debugger::setOnDebuggerStatement, 0),
JS_PSGS("onExceptionUnwind", Debugger::getOnExceptionUnwind,
Debugger::setOnExceptionUnwind, 0),
JS_PSGS("onNewScript", Debugger::getOnNewScript, Debugger::setOnNewScript, 0),
JS_PSGS("onNewPromise", Debugger::getOnNewPromise, Debugger::setOnNewPromise, 0),
JS_PSGS("onPromiseSettled", Debugger::getOnPromiseSettled, Debugger::setOnPromiseSettled, 0),
JS_PSGS("onEnterFrame", Debugger::getOnEnterFrame, Debugger::setOnEnterFrame, 0),
JS_PSGS("onNewGlobalObject", Debugger::getOnNewGlobalObject, Debugger::setOnNewGlobalObject, 0),
JS_PSGS("uncaughtExceptionHook", Debugger::getUncaughtExceptionHook,
Debugger::setUncaughtExceptionHook, 0),
JS_PSGS("allowUnobservedAsmJS", Debugger::getAllowUnobservedAsmJS,
Debugger::setAllowUnobservedAsmJS, 0),
JS_PSGS("collectCoverageInfo", Debugger::getCollectCoverageInfo,
Debugger::setCollectCoverageInfo, 0),
JS_PSG("memory", Debugger::getMemory, 0),
JS_PSGS("onIonCompilation", Debugger::getOnIonCompilation, Debugger::setOnIonCompilation, 0),
JS_PS_END
};
const JSFunctionSpec Debugger::methods[] = {
JS_FN("addDebuggee", Debugger::addDebuggee, 1, 0),
JS_FN("addAllGlobalsAsDebuggees", Debugger::addAllGlobalsAsDebuggees, 0, 0),
JS_FN("removeDebuggee", Debugger::removeDebuggee, 1, 0),
JS_FN("removeAllDebuggees", Debugger::removeAllDebuggees, 0, 0),
JS_FN("hasDebuggee", Debugger::hasDebuggee, 1, 0),
JS_FN("getDebuggees", Debugger::getDebuggees, 0, 0),
JS_FN("getNewestFrame", Debugger::getNewestFrame, 0, 0),
JS_FN("clearAllBreakpoints", Debugger::clearAllBreakpoints, 0, 0),
JS_FN("findScripts", Debugger::findScripts, 1, 0),
JS_FN("findObjects", Debugger::findObjects, 1, 0),
JS_FN("findAllGlobals", Debugger::findAllGlobals, 0, 0),
JS_FN("makeGlobalObjectReference", Debugger::makeGlobalObjectReference, 1, 0),
#ifdef JS_TRACE_LOGGING
JS_FN("setupTraceLoggerScriptCalls", Debugger::setupTraceLoggerScriptCalls, 0, 0),
JS_FN("drainTraceLoggerScriptCalls", Debugger::drainTraceLoggerScriptCalls, 0, 0),
JS_FN("startTraceLogger", Debugger::startTraceLogger, 0, 0),
JS_FN("endTraceLogger", Debugger::endTraceLogger, 0, 0),
# ifdef NIGHTLY_BUILD
JS_FN("setupTraceLogger", Debugger::setupTraceLogger, 1, 0),
JS_FN("drainTraceLogger", Debugger::drainTraceLogger, 0, 0),
# endif
#endif
JS_FS_END
};
/*** Debugger.Script *****************************************************************************/
static inline JSScript*
GetScriptReferent(JSObject* obj)
{
MOZ_ASSERT(obj->getClass() == &DebuggerScript_class);
return static_cast<JSScript*>(obj->as<NativeObject>().getPrivate());
}
void
DebuggerScript_trace(JSTracer* trc, JSObject* obj)
{
/* This comes from a private pointer, so no barrier needed. */
if (JSScript* script = GetScriptReferent(obj)) {
TraceManuallyBarrieredCrossCompartmentEdge(trc, obj, &script, "Debugger.Script referent");
obj->as<NativeObject>().setPrivateUnbarriered(script);
}
}
const Class DebuggerScript_class = {
"Script",
JSCLASS_HAS_PRIVATE |
JSCLASS_HAS_RESERVED_SLOTS(JSSLOT_DEBUGSCRIPT_COUNT),
nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, nullptr, nullptr,
nullptr, /* call */
nullptr, /* hasInstance */
nullptr, /* construct */
DebuggerScript_trace
};
JSObject*
Debugger::newDebuggerScript(JSContext* cx, HandleScript script)
{
assertSameCompartment(cx, object.get());
RootedObject proto(cx, &object->getReservedSlot(JSSLOT_DEBUG_SCRIPT_PROTO).toObject());
MOZ_ASSERT(proto);
NativeObject* scriptobj = NewNativeObjectWithGivenProto(cx, &DebuggerScript_class,
proto, TenuredObject);
if (!scriptobj)
return nullptr;
scriptobj->setReservedSlot(JSSLOT_DEBUGSCRIPT_OWNER, ObjectValue(*object));
scriptobj->setPrivateGCThing(script);
return scriptobj;
}
JSObject*
Debugger::wrapScript(JSContext* cx, HandleScript script)
{
assertSameCompartment(cx, object.get());
MOZ_ASSERT(cx->compartment() != script->compartment());
DependentAddPtr<ScriptWeakMap> p(cx, scripts, script);
if (!p) {
JSObject* scriptobj = newDebuggerScript(cx, script);
if (!scriptobj)
return nullptr;
if (!p.add(cx, scripts, script, scriptobj))
return nullptr;
CrossCompartmentKey key(CrossCompartmentKey::DebuggerScript, object, script);
if (!object->compartment()->putWrapper(cx, key, ObjectValue(*scriptobj))) {
scripts.remove(script);
ReportOutOfMemory(cx);
return nullptr;
}
}
MOZ_ASSERT(GetScriptReferent(p->value()) == script);
return p->value();
}
static JSObject*
DebuggerScript_check(JSContext* cx, const Value& v, const char* clsname, const char* fnname)
{
JSObject* thisobj = NonNullObject(cx, v);
if (!thisobj)
return nullptr;
if (thisobj->getClass() != &DebuggerScript_class) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
clsname, fnname, thisobj->getClass()->name);
return nullptr;
}
/*
* Check for Debugger.Script.prototype, which is of class DebuggerScript_class
* but whose script is null.
*/
if (!GetScriptReferent(thisobj)) {
MOZ_ASSERT(!GetScriptReferent(thisobj));
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
clsname, fnname, "prototype object");
return nullptr;
}
return thisobj;
}
static JSObject*
DebuggerScript_checkThis(JSContext* cx, const CallArgs& args, const char* fnname)
{
return DebuggerScript_check(cx, args.thisv(), "Debugger.Script", fnname);
}
#define THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, fnname, args, obj, script) \
CallArgs args = CallArgsFromVp(argc, vp); \
RootedObject obj(cx, DebuggerScript_checkThis(cx, args, fnname)); \
if (!obj) \
return false; \
Rooted<JSScript*> script(cx, GetScriptReferent(obj))
static bool
DebuggerScript_getDisplayName(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "(get displayName)", args, obj, script);
Debugger* dbg = Debugger::fromChildJSObject(obj);
JSFunction* func = script->functionNonDelazifying();
JSString* name = func ? func->displayAtom() : nullptr;
if (!name) {
args.rval().setUndefined();
return true;
}
RootedValue namev(cx, StringValue(name));
if (!dbg->wrapDebuggeeValue(cx, &namev))
return false;
args.rval().set(namev);
return true;
}
static bool
DebuggerScript_getUrl(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "(get url)", args, obj, script);
if (script->filename()) {
JSString* str;
if (script->scriptSource()->introducerFilename())
str = NewStringCopyZ<CanGC>(cx, script->scriptSource()->introducerFilename());
else
str = NewStringCopyZ<CanGC>(cx, script->filename());
if (!str)
return false;
args.rval().setString(str);
} else {
args.rval().setNull();
}
return true;
}
static bool
DebuggerScript_getStartLine(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "(get startLine)", args, obj, script);
args.rval().setNumber(uint32_t(script->lineno()));
return true;
}
static bool
DebuggerScript_getLineCount(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "(get lineCount)", args, obj, script);
unsigned maxLine = GetScriptLineExtent(script);
args.rval().setNumber(double(maxLine));
return true;
}
static bool
DebuggerScript_getSource(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "(get source)", args, obj, script);
Debugger* dbg = Debugger::fromChildJSObject(obj);
RootedScriptSource source(cx, &UncheckedUnwrap(script->sourceObject())->as<ScriptSourceObject>());
RootedObject sourceObject(cx, dbg->wrapSource(cx, source));
if (!sourceObject)
return false;
args.rval().setObject(*sourceObject);
return true;
}
static bool
DebuggerScript_getSourceStart(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "(get sourceStart)", args, obj, script);
args.rval().setNumber(uint32_t(script->sourceStart()));
return true;
}
static bool
DebuggerScript_getSourceLength(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "(get sourceEnd)", args, obj, script);
args.rval().setNumber(uint32_t(script->sourceEnd() - script->sourceStart()));
return true;
}
static bool
DebuggerScript_getGlobal(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "(get global)", args, obj, script);
Debugger* dbg = Debugger::fromChildJSObject(obj);
RootedValue v(cx, ObjectValue(script->global()));
if (!dbg->wrapDebuggeeValue(cx, &v))
return false;
args.rval().set(v);
return true;
}
static bool
DebuggerScript_getChildScripts(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "getChildScripts", args, obj, script);
Debugger* dbg = Debugger::fromChildJSObject(obj);
RootedObject result(cx, NewDenseEmptyArray(cx));
if (!result)
return false;
if (script->hasObjects()) {
/*
* script->savedCallerFun indicates that this is a direct eval script
* and the calling function is stored as script->objects()->vector[0].
* It is not really a child script of this script, so skip it using
* innerObjectsStart().
*/
ObjectArray* objects = script->objects();
RootedFunction fun(cx);
RootedScript funScript(cx);
RootedObject obj(cx), s(cx);
for (uint32_t i = script->innerObjectsStart(); i < objects->length; i++) {
obj = objects->vector[i];
if (obj->is<JSFunction>()) {
fun = &obj->as<JSFunction>();
// The inner function could be an asm.js native.
if (fun->isNative())
continue;
funScript = GetOrCreateFunctionScript(cx, fun);
if (!funScript)
return false;
s = dbg->wrapScript(cx, funScript);
if (!s || !NewbornArrayPush(cx, result, ObjectValue(*s)))
return false;
}
}
}
args.rval().setObject(*result);
return true;
}
static bool
ScriptOffset(JSContext* cx, JSScript* script, const Value& v, size_t* offsetp)
{
double d;
size_t off;
bool ok = v.isNumber();
if (ok) {
d = v.toNumber();
off = size_t(d);
}
if (!ok || off != d || !IsValidBytecodeOffset(cx, script, off)) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_BAD_OFFSET);
return false;
}
*offsetp = off;
return true;
}
namespace {
class BytecodeRangeWithPosition : private BytecodeRange
{
public:
using BytecodeRange::empty;
using BytecodeRange::frontPC;
using BytecodeRange::frontOpcode;
using BytecodeRange::frontOffset;
BytecodeRangeWithPosition(JSContext* cx, JSScript* script)
: BytecodeRange(cx, script), lineno(script->lineno()), column(0),
sn(script->notes()), snpc(script->code()), isEntryPoint(false)
{
if (!SN_IS_TERMINATOR(sn))
snpc += SN_DELTA(sn);
updatePosition();
while (frontPC() != script->main())
popFront();
isEntryPoint = true;
}
void popFront() {
BytecodeRange::popFront();
if (empty())
isEntryPoint = false;
else
updatePosition();
}
size_t frontLineNumber() const { return lineno; }
size_t frontColumnNumber() const { return column; }
// Entry points are restricted to bytecode offsets that have an
// explicit mention in the line table. This restriction avoids a
// number of failing cases caused by some instructions not having
// sensible (to the user) line numbers, and it is one way to
// implement the idea that the bytecode emitter should tell the
// debugger exactly which offsets represent "interesting" (to the
// user) places to stop.
bool frontIsEntryPoint() const { return isEntryPoint; }
private:
void updatePosition() {
/*
* Determine the current line number by reading all source notes up to
* and including the current offset.
*/
jsbytecode *lastLinePC = nullptr;
while (!SN_IS_TERMINATOR(sn) && snpc <= frontPC()) {
SrcNoteType type = (SrcNoteType) SN_TYPE(sn);
if (type == SRC_COLSPAN) {
ptrdiff_t colspan = SN_OFFSET_TO_COLSPAN(GetSrcNoteOffset(sn, 0));
MOZ_ASSERT(ptrdiff_t(column) + colspan >= 0);
column += colspan;
lastLinePC = snpc;
} else if (type == SRC_SETLINE) {
lineno = size_t(GetSrcNoteOffset(sn, 0));
column = 0;
lastLinePC = snpc;
} else if (type == SRC_NEWLINE) {
lineno++;
column = 0;
lastLinePC = snpc;
}
sn = SN_NEXT(sn);
snpc += SN_DELTA(sn);
}
isEntryPoint = lastLinePC == frontPC();
}
size_t lineno;
size_t column;
jssrcnote* sn;
jsbytecode* snpc;
bool isEntryPoint;
};
/*
* FlowGraphSummary::populate(cx, script) computes a summary of script's
* control flow graph used by DebuggerScript_{getAllOffsets,getLineOffsets}.
*
* An instruction on a given line is an entry point for that line if it can be
* reached from (an instruction on) a different line. We distinguish between the
* following cases:
* - hasNoEdges:
* The instruction cannot be reached, so the instruction is not an entry
* point for the line it is on.
* - hasSingleEdge:
* - hasMultipleEdgesFromSingleLine:
* The instruction can be reached from a single line. If this line is
* different from the line the instruction is on, the instruction is an
* entry point for that line.
* - hasMultipleEdgesFromMultipleLines:
* The instruction can be reached from multiple lines. At least one of
* these lines is guaranteed to be different from the line the instruction
* is on, so the instruction is an entry point for that line.
*
* Similarly, an instruction on a given position (line/column pair) is an
* entry point for that position if it can be reached from (an instruction on) a
* different position. Again, we distinguish between the following cases:
* - hasNoEdges:
* The instruction cannot be reached, so the instruction is not an entry
* point for the position it is on.
* - hasSingleEdge:
* The instruction can be reached from a single position. If this line is
* different from the position the instruction is on, the instruction is
* an entry point for that position.
* - hasMultipleEdgesFromSingleLine:
* - hasMultipleEdgesFromMultipleLines:
* The instruction can be reached from multiple positions. At least one
* of these positions is guaranteed to be different from the position the
* instruction is on, so the instruction is an entry point for that
* position.
*/
class FlowGraphSummary {
public:
class Entry {
public:
static Entry createWithNoEdges() {
return Entry(SIZE_MAX, 0);
}
static Entry createWithSingleEdge(size_t lineno, size_t column) {
return Entry(lineno, column);
}
static Entry createWithMultipleEdgesFromSingleLine(size_t lineno) {
return Entry(lineno, SIZE_MAX);
}
static Entry createWithMultipleEdgesFromMultipleLines() {
return Entry(SIZE_MAX, SIZE_MAX);
}
Entry() {}
bool hasNoEdges() const {
return lineno_ == SIZE_MAX && column_ != SIZE_MAX;
}
bool hasSingleEdge() const {
return lineno_ != SIZE_MAX && column_ != SIZE_MAX;
}
bool hasMultipleEdgesFromSingleLine() const {
return lineno_ != SIZE_MAX && column_ == SIZE_MAX;
}
bool hasMultipleEdgesFromMultipleLines() const {
return lineno_ == SIZE_MAX && column_ == SIZE_MAX;
}
bool operator==(const Entry& other) const {
return lineno_ == other.lineno_ && column_ == other.column_;
}
bool operator!=(const Entry& other) const {
return lineno_ != other.lineno_ || column_ != other.column_;
}
size_t lineno() const {
return lineno_;
}
size_t column() const {
return column_;
}
private:
Entry(size_t lineno, size_t column) : lineno_(lineno), column_(column) {}
size_t lineno_;
size_t column_;
};
explicit FlowGraphSummary(JSContext* cx) : entries_(cx) {}
Entry& operator[](size_t index) {
return entries_[index];
}
bool populate(JSContext* cx, JSScript* script) {
if (!entries_.growBy(script->length()))
return false;
unsigned mainOffset = script->pcToOffset(script->main());
entries_[mainOffset] = Entry::createWithMultipleEdgesFromMultipleLines();
for (size_t i = mainOffset + 1; i < script->length(); i++)
entries_[i] = Entry::createWithNoEdges();
size_t prevLineno = script->lineno();
size_t prevColumn = 0;
JSOp prevOp = JSOP_NOP;
for (BytecodeRangeWithPosition r(cx, script); !r.empty(); r.popFront()) {
size_t lineno = r.frontLineNumber();
size_t column = r.frontColumnNumber();
JSOp op = r.frontOpcode();
if (FlowsIntoNext(prevOp))
addEdge(prevLineno, prevColumn, r.frontOffset());
if (CodeSpec[op].type() == JOF_JUMP) {
addEdge(lineno, column, r.frontOffset() + GET_JUMP_OFFSET(r.frontPC()));
} else if (op == JSOP_TABLESWITCH) {
jsbytecode* pc = r.frontPC();
size_t offset = r.frontOffset();
ptrdiff_t step = JUMP_OFFSET_LEN;
size_t defaultOffset = offset + GET_JUMP_OFFSET(pc);
pc += step;
addEdge(lineno, column, defaultOffset);
int32_t low = GET_JUMP_OFFSET(pc);
pc += JUMP_OFFSET_LEN;
int ncases = GET_JUMP_OFFSET(pc) - low + 1;
pc += JUMP_OFFSET_LEN;
for (int i = 0; i < ncases; i++) {
size_t target = offset + GET_JUMP_OFFSET(pc);
addEdge(lineno, column, target);
pc += step;
}
}
prevLineno = lineno;
prevColumn = column;
prevOp = op;
}
return true;
}
private:
void addEdge(size_t sourceLineno, size_t sourceColumn, size_t targetOffset) {
if (entries_[targetOffset].hasNoEdges())
entries_[targetOffset] = Entry::createWithSingleEdge(sourceLineno, sourceColumn);
else if (entries_[targetOffset].lineno() != sourceLineno)
entries_[targetOffset] = Entry::createWithMultipleEdgesFromMultipleLines();
else if (entries_[targetOffset].column() != sourceColumn)
entries_[targetOffset] = Entry::createWithMultipleEdgesFromSingleLine(sourceLineno);
}
Vector<Entry> entries_;
};
} /* anonymous namespace */
static bool
DebuggerScript_getOffsetLocation(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "getOffsetLocation", args, obj, script);
if (!args.requireAtLeast(cx, "Debugger.Script.getOffsetLocation", 1))
return false;
size_t offset;
if (!ScriptOffset(cx, script, args[0], &offset))
return false;
FlowGraphSummary flowData(cx);
if (!flowData.populate(cx, script))
return false;
RootedPlainObject result(cx, NewBuiltinClassInstance<PlainObject>(cx));
if (!result)
return false;
BytecodeRangeWithPosition r(cx, script);
while (!r.empty() && r.frontOffset() < offset)
r.popFront();
RootedId id(cx, NameToId(cx->names().lineNumber));
RootedValue value(cx, NumberValue(r.frontLineNumber()));
if (!DefineProperty(cx, result, id, value))
return false;
value = NumberValue(r.frontColumnNumber());
if (!DefineProperty(cx, result, cx->names().columnNumber, value))
return false;
// The same entry point test that is used by getAllColumnOffsets.
bool isEntryPoint = (r.frontIsEntryPoint() &&
!flowData[offset].hasNoEdges() &&
(flowData[offset].lineno() != r.frontLineNumber() ||
flowData[offset].column() != r.frontColumnNumber()));
value.setBoolean(isEntryPoint);
if (!DefineProperty(cx, result, cx->names().isEntryPoint, value))
return false;
args.rval().setObject(*result);
return true;
}
static bool
DebuggerScript_getAllOffsets(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "getAllOffsets", args, obj, script);
/*
* First pass: determine which offsets in this script are jump targets and
* which line numbers jump to them.
*/
FlowGraphSummary flowData(cx);
if (!flowData.populate(cx, script))
return false;
/* Second pass: build the result array. */
RootedObject result(cx, NewDenseEmptyArray(cx));
if (!result)
return false;
for (BytecodeRangeWithPosition r(cx, script); !r.empty(); r.popFront()) {
if (!r.frontIsEntryPoint())
continue;
size_t offset = r.frontOffset();
size_t lineno = r.frontLineNumber();
/* Make a note, if the current instruction is an entry point for the current line. */
if (!flowData[offset].hasNoEdges() && flowData[offset].lineno() != lineno) {
/* Get the offsets array for this line. */
RootedObject offsets(cx);
RootedValue offsetsv(cx);
RootedId id(cx, INT_TO_JSID(lineno));
bool found;
if (!HasOwnProperty(cx, result, id, &found))
return false;
if (found && !GetProperty(cx, result, result, id, &offsetsv))
return false;
if (offsetsv.isObject()) {
offsets = &offsetsv.toObject();
} else {
MOZ_ASSERT(offsetsv.isUndefined());
/*
* Create an empty offsets array for this line.
* Store it in the result array.
*/
RootedId id(cx);
RootedValue v(cx, NumberValue(lineno));
offsets = NewDenseEmptyArray(cx);
if (!offsets ||
!ValueToId<CanGC>(cx, v, &id))
{
return false;
}
RootedValue value(cx, ObjectValue(*offsets));
if (!DefineProperty(cx, result, id, value))
return false;
}
/* Append the current offset to the offsets array. */
if (!NewbornArrayPush(cx, offsets, NumberValue(offset)))
return false;
}
}
args.rval().setObject(*result);
return true;
}
static bool
DebuggerScript_getAllColumnOffsets(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "getAllColumnOffsets", args, obj, script);
/*
* First pass: determine which offsets in this script are jump targets and
* which positions jump to them.
*/
FlowGraphSummary flowData(cx);
if (!flowData.populate(cx, script))
return false;
/* Second pass: build the result array. */
RootedObject result(cx, NewDenseEmptyArray(cx));
if (!result)
return false;
for (BytecodeRangeWithPosition r(cx, script); !r.empty(); r.popFront()) {
size_t lineno = r.frontLineNumber();
size_t column = r.frontColumnNumber();
size_t offset = r.frontOffset();
/* Make a note, if the current instruction is an entry point for the current position. */
if (r.frontIsEntryPoint() &&
!flowData[offset].hasNoEdges() &&
(flowData[offset].lineno() != lineno ||
flowData[offset].column() != column)) {
RootedPlainObject entry(cx, NewBuiltinClassInstance<PlainObject>(cx));
if (!entry)
return false;
RootedId id(cx, NameToId(cx->names().lineNumber));
RootedValue value(cx, NumberValue(lineno));
if (!DefineProperty(cx, entry, id, value))
return false;
value = NumberValue(column);
if (!DefineProperty(cx, entry, cx->names().columnNumber, value))
return false;
id = NameToId(cx->names().offset);
value = NumberValue(offset);
if (!DefineProperty(cx, entry, id, value))
return false;
if (!NewbornArrayPush(cx, result, ObjectValue(*entry)))
return false;
}
}
args.rval().setObject(*result);
return true;
}
static bool
DebuggerScript_getLineOffsets(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "getLineOffsets", args, obj, script);
if (!args.requireAtLeast(cx, "Debugger.Script.getLineOffsets", 1))
return false;
/* Parse lineno argument. */
RootedValue linenoValue(cx, args[0]);
size_t lineno;
if (!ToNumber(cx, &linenoValue))
return false;
{
double d = linenoValue.toNumber();
lineno = size_t(d);
if (lineno != d) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_BAD_LINE);
return false;
}
}
/*
* First pass: determine which offsets in this script are jump targets and
* which line numbers jump to them.
*/
FlowGraphSummary flowData(cx);
if (!flowData.populate(cx, script))
return false;
/* Second pass: build the result array. */
RootedObject result(cx, NewDenseEmptyArray(cx));
if (!result)
return false;
for (BytecodeRangeWithPosition r(cx, script); !r.empty(); r.popFront()) {
if (!r.frontIsEntryPoint())
continue;
size_t offset = r.frontOffset();
/* If the op at offset is an entry point, append offset to result. */
if (r.frontLineNumber() == lineno &&
!flowData[offset].hasNoEdges() &&
flowData[offset].lineno() != lineno)
{
if (!NewbornArrayPush(cx, result, NumberValue(offset)))
return false;
}
}
args.rval().setObject(*result);
return true;
}
bool
Debugger::observesFrame(AbstractFramePtr frame) const
{
return observesScript(frame.script());
}
bool
Debugger::observesFrame(const ScriptFrameIter& iter) const
{
return observesScript(iter.script());
}
bool
Debugger::observesScript(JSScript* script) const
{
if (!enabled)
return false;
// Don't ever observe self-hosted scripts: the Debugger API can break
// self-hosted invariants.
return observesGlobal(&script->global()) && !script->selfHosted();
}
/* static */ bool
Debugger::replaceFrameGuts(JSContext* cx, AbstractFramePtr from, AbstractFramePtr to,
ScriptFrameIter& iter)
{
// Forward live Debugger.Frame objects.
for (Debugger::FrameRange r(from); !r.empty(); r.popFront()) {
RootedNativeObject frameobj(cx, r.frontFrame());
Debugger* dbg = r.frontDebugger();
MOZ_ASSERT(dbg == Debugger::fromChildJSObject(frameobj));
// Update frame object's ScriptFrameIter::data pointer.
DebuggerFrame_freeScriptFrameIterData(cx->runtime()->defaultFreeOp(), frameobj);
ScriptFrameIter::Data* data = iter.copyData();
if (!data)
return false;
frameobj->setPrivate(data);
// Remove the old entry before mutating the HashMap.
r.removeFrontFrame();
// Add the frame object with |to| as key.
if (!dbg->frames.putNew(to, frameobj)) {
ReportOutOfMemory(cx);
return false;
}
}
// Rekey missingScopes to maintain Debugger.Environment identity and
// forward liveScopes to point to the new frame, as the old frame will be
// gone.
DebugScopes::forwardLiveFrame(cx, from, to);
return true;
}
/* static */ bool
Debugger::inFrameMaps(AbstractFramePtr frame)
{
FrameRange r(frame);
return !r.empty();
}
/* static */ void
Debugger::removeFromFrameMapsAndClearBreakpointsIn(JSContext* cx, AbstractFramePtr frame)
{
Handle<GlobalObject*> global = cx->global();
for (FrameRange r(frame, global); !r.empty(); r.popFront()) {
RootedNativeObject frameobj(cx, r.frontFrame());
Debugger* dbg = r.frontDebugger();
MOZ_ASSERT(dbg == Debugger::fromChildJSObject(frameobj));
FreeOp* fop = cx->runtime()->defaultFreeOp();
DebuggerFrame_freeScriptFrameIterData(fop, frameobj);
DebuggerFrame_maybeDecrementFrameScriptStepModeCount(fop, frame, frameobj);
dbg->frames.remove(frame);
}
/*
* If this is an eval frame, then from the debugger's perspective the
* script is about to be destroyed. Remove any breakpoints in it.
*/
if (frame.isEvalFrame()) {
RootedScript script(cx, frame.script());
script->clearBreakpointsIn(cx->runtime()->defaultFreeOp(), nullptr, nullptr);
}
}
/* static */ bool
Debugger::handleBaselineOsr(JSContext* cx, InterpreterFrame* from, jit::BaselineFrame* to)
{
ScriptFrameIter iter(cx);
MOZ_ASSERT(iter.abstractFramePtr() == to);
return replaceFrameGuts(cx, from, to, iter);
}
/* static */ bool
Debugger::handleIonBailout(JSContext* cx, jit::RematerializedFrame* from, jit::BaselineFrame* to)
{
// When we return to a bailed-out Ion real frame, we must update all
// Debugger.Frames that refer to its inline frames. However, since we
// can't pop individual inline frames off the stack (we can only pop the
// real frame that contains them all, as a unit), we cannot assume that
// the frame we're dealing with is the top frame. Advance the iterator
// across any inlined frames younger than |to|, the baseline frame
// reconstructed during bailout from the Ion frame corresponding to
// |from|.
ScriptFrameIter iter(cx);
while (iter.abstractFramePtr() != to)
++iter;
return replaceFrameGuts(cx, from, to, iter);
}
/* static */ void
Debugger::handleUnrecoverableIonBailoutError(JSContext* cx, jit::RematerializedFrame* frame)
{
// Ion bailout can fail due to overrecursion. In such cases we cannot
// honor any further Debugger hooks on the frame, and need to ensure that
// its Debugger.Frame entry is cleaned up.
removeFromFrameMapsAndClearBreakpointsIn(cx, frame);
}
/* static */ void
Debugger::propagateForcedReturn(JSContext* cx, AbstractFramePtr frame, HandleValue rval)
{
// Invoking the interrupt handler is considered a step and invokes the
// youngest frame's onStep handler, if any. However, we cannot handle
// { return: ... } resumption values straightforwardly from the interrupt
// handler. Instead, we set the intended return value in the frame's rval
// slot and set the propagating-forced-return flag on the JSContext.
//
// The interrupt handler then returns false with no exception set,
// signaling an uncatchable exception. In the exception handlers, we then
// check for the special propagating-forced-return flag.
MOZ_ASSERT(!cx->isExceptionPending());
cx->setPropagatingForcedReturn();
frame.setReturnValue(rval);
}
static bool
DebuggerScript_setBreakpoint(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "setBreakpoint", args, obj, script);
if (!args.requireAtLeast(cx, "Debugger.Script.setBreakpoint", 2))
return false;
Debugger* dbg = Debugger::fromChildJSObject(obj);
if (!dbg->observesScript(script)) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_NOT_DEBUGGING);
return false;
}
size_t offset;
if (!ScriptOffset(cx, script, args[0], &offset))
return false;
RootedObject handler(cx, NonNullObject(cx, args[1]));
if (!handler)
return false;
// Ensure observability *before* setting the breakpoint. If the script is
// not already a debuggee, trying to ensure observability after setting
// the breakpoint (and thus marking the script as a debuggee) will skip
// actually ensuring observability.
if (!dbg->ensureExecutionObservabilityOfScript(cx, script))
return false;
jsbytecode* pc = script->offsetToPC(offset);
BreakpointSite* site = script->getOrCreateBreakpointSite(cx, pc);
if (!site)
return false;
site->inc(cx->runtime()->defaultFreeOp());
if (cx->runtime()->new_<Breakpoint>(dbg, site, handler)) {
args.rval().setUndefined();
return true;
}
site->dec(cx->runtime()->defaultFreeOp());
site->destroyIfEmpty(cx->runtime()->defaultFreeOp());
return false;
}
static bool
DebuggerScript_getBreakpoints(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "getBreakpoints", args, obj, script);
Debugger* dbg = Debugger::fromChildJSObject(obj);
jsbytecode* pc;
if (args.length() > 0) {
size_t offset;
if (!ScriptOffset(cx, script, args[0], &offset))
return false;
pc = script->offsetToPC(offset);
} else {
pc = nullptr;
}
RootedObject arr(cx, NewDenseEmptyArray(cx));
if (!arr)
return false;
for (unsigned i = 0; i < script->length(); i++) {
BreakpointSite* site = script->getBreakpointSite(script->offsetToPC(i));
if (site && (!pc || site->pc == pc)) {
for (Breakpoint* bp = site->firstBreakpoint(); bp; bp = bp->nextInSite()) {
if (bp->debugger == dbg &&
!NewbornArrayPush(cx, arr, ObjectValue(*bp->getHandler())))
{
return false;
}
}
}
}
args.rval().setObject(*arr);
return true;
}
static bool
DebuggerScript_clearBreakpoint(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "clearBreakpoint", args, obj, script);
if (!args.requireAtLeast(cx, "Debugger.Script.clearBreakpoint", 1))
return false;
Debugger* dbg = Debugger::fromChildJSObject(obj);
JSObject* handler = NonNullObject(cx, args[0]);
if (!handler)
return false;
script->clearBreakpointsIn(cx->runtime()->defaultFreeOp(), dbg, handler);
args.rval().setUndefined();
return true;
}
static bool
DebuggerScript_clearAllBreakpoints(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "clearAllBreakpoints", args, obj, script);
Debugger* dbg = Debugger::fromChildJSObject(obj);
script->clearBreakpointsIn(cx->runtime()->defaultFreeOp(), dbg, nullptr);
args.rval().setUndefined();
return true;
}
static bool
DebuggerScript_isInCatchScope(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "isInCatchScope", args, obj, script);
if (!args.requireAtLeast(cx, "Debugger.Script.isInCatchScope", 1))
return false;
size_t offset;
if (!ScriptOffset(cx, script, args[0], &offset))
return false;
/*
* Try note ranges are relative to the mainOffset of the script, so adjust
* offset accordingly.
*/
offset -= script->mainOffset();
args.rval().setBoolean(false);
if (script->hasTrynotes()) {
JSTryNote* tnBegin = script->trynotes()->vector;
JSTryNote* tnEnd = tnBegin + script->trynotes()->length;
while (tnBegin != tnEnd) {
if (tnBegin->start <= offset &&
offset <= tnBegin->start + tnBegin->length &&
tnBegin->kind == JSTRY_CATCH)
{
args.rval().setBoolean(true);
break;
}
++tnBegin;
}
}
return true;
}
static bool
DebuggerScript_getOffsetsCoverage(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSCRIPT_SCRIPT(cx, argc, vp, "getOffsetsCoverage", args, obj, script);
// If the script has no coverage information, then skip this and return null
// instead.
if (!script->hasScriptCounts()) {
args.rval().setNull();
return true;
}
ScriptCounts* sc = &script->getScriptCounts();
// If the main ever got visited, then assume that any code before main got
// visited once.
uint64_t hits = 0;
const PCCounts* counts = sc->maybeGetPCCounts(script->pcToOffset(script->main()));
if (counts->numExec())
hits = 1;
// Build an array of objects which are composed of 4 properties:
// - offset PC offset of the current opcode.
// - lineNumber Line of the current opcode.
// - columnNumber Column of the current opcode.
// - count Number of times the instruction got executed.
RootedObject result(cx, NewDenseEmptyArray(cx));
if (!result)
return false;
RootedId offsetId(cx, AtomToId(cx->names().offset));
RootedId lineNumberId(cx, AtomToId(cx->names().lineNumber));
RootedId columnNumberId(cx, AtomToId(cx->names().columnNumber));
RootedId countId(cx, AtomToId(cx->names().count));
RootedObject item(cx);
RootedValue offsetValue(cx);
RootedValue lineNumberValue(cx);
RootedValue columnNumberValue(cx);
RootedValue countValue(cx);
// Iterate linearly over the bytecode.
for (BytecodeRangeWithPosition r(cx, script); !r.empty(); r.popFront()) {
size_t offset = r.frontOffset();
// The beginning of each non-branching sequences of instruction set the
// number of execution of the current instruction and any following
// instruction.
counts = sc->maybeGetPCCounts(offset);
if (counts)
hits = counts->numExec();
offsetValue.setNumber(double(offset));
lineNumberValue.setNumber(double(r.frontLineNumber()));
columnNumberValue.setNumber(double(r.frontColumnNumber()));
countValue.setNumber(double(hits));
// Create a new object with the offset, line number, column number, the
// number of hit counts, and append it to the array.
item = NewObjectWithGivenProto<PlainObject>(cx, nullptr);
if (!item ||
!DefineProperty(cx, item, offsetId, offsetValue) ||
!DefineProperty(cx, item, lineNumberId, lineNumberValue) ||
!DefineProperty(cx, item, columnNumberId, columnNumberValue) ||
!DefineProperty(cx, item, countId, countValue) ||
!NewbornArrayPush(cx, result, ObjectValue(*item)))
{
return false;
}
// If the current instruction has thrown, then decrement the hit counts
// with the number of throws.
counts = sc->maybeGetThrowCounts(offset);
if (counts)
hits -= counts->numExec();
}
args.rval().setObject(*result);
return true;
}
static bool
DebuggerScript_construct(JSContext* cx, unsigned argc, Value* vp)
{
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NO_CONSTRUCTOR,
"Debugger.Script");
return false;
}
static const JSPropertySpec DebuggerScript_properties[] = {
JS_PSG("displayName", DebuggerScript_getDisplayName, 0),
JS_PSG("url", DebuggerScript_getUrl, 0),
JS_PSG("startLine", DebuggerScript_getStartLine, 0),
JS_PSG("lineCount", DebuggerScript_getLineCount, 0),
JS_PSG("source", DebuggerScript_getSource, 0),
JS_PSG("sourceStart", DebuggerScript_getSourceStart, 0),
JS_PSG("sourceLength", DebuggerScript_getSourceLength, 0),
JS_PSG("global", DebuggerScript_getGlobal, 0),
JS_PS_END
};
static const JSFunctionSpec DebuggerScript_methods[] = {
JS_FN("getChildScripts", DebuggerScript_getChildScripts, 0, 0),
JS_FN("getAllOffsets", DebuggerScript_getAllOffsets, 0, 0),
JS_FN("getAllColumnOffsets", DebuggerScript_getAllColumnOffsets, 0, 0),
JS_FN("getLineOffsets", DebuggerScript_getLineOffsets, 1, 0),
JS_FN("getOffsetLocation", DebuggerScript_getOffsetLocation, 0, 0),
JS_FN("setBreakpoint", DebuggerScript_setBreakpoint, 2, 0),
JS_FN("getBreakpoints", DebuggerScript_getBreakpoints, 1, 0),
JS_FN("clearBreakpoint", DebuggerScript_clearBreakpoint, 1, 0),
JS_FN("clearAllBreakpoints", DebuggerScript_clearAllBreakpoints, 0, 0),
JS_FN("isInCatchScope", DebuggerScript_isInCatchScope, 1, 0),
JS_FN("getOffsetsCoverage", DebuggerScript_getOffsetsCoverage, 0, 0),
JS_FS_END
};
/*** Debugger.Source *****************************************************************************/
static inline ScriptSourceObject*
GetSourceReferent(JSObject* obj)
{
MOZ_ASSERT(obj->getClass() == &DebuggerSource_class);
return static_cast<ScriptSourceObject*>(obj->as<NativeObject>().getPrivate());
}
void
DebuggerSource_trace(JSTracer* trc, JSObject* obj)
{
/*
* There is a barrier on private pointers, so the Unbarriered marking
* is okay.
*/
if (JSObject* referent = GetSourceReferent(obj)) {
TraceManuallyBarrieredCrossCompartmentEdge(trc, obj, &referent,
"Debugger.Source referent");
obj->as<NativeObject>().setPrivateUnbarriered(referent);
}
}
const Class DebuggerSource_class = {
"Source",
JSCLASS_HAS_PRIVATE |
JSCLASS_HAS_RESERVED_SLOTS(JSSLOT_DEBUGSOURCE_COUNT),
nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, nullptr, nullptr,
nullptr, /* call */
nullptr, /* hasInstance */
nullptr, /* construct */
DebuggerSource_trace
};
JSObject*
Debugger::newDebuggerSource(JSContext* cx, HandleScriptSource source)
{
assertSameCompartment(cx, object.get());
RootedObject proto(cx, &object->getReservedSlot(JSSLOT_DEBUG_SOURCE_PROTO).toObject());
MOZ_ASSERT(proto);
NativeObject* sourceobj = NewNativeObjectWithGivenProto(cx, &DebuggerSource_class,
proto, TenuredObject);
if (!sourceobj)
return nullptr;
sourceobj->setReservedSlot(JSSLOT_DEBUGSOURCE_OWNER, ObjectValue(*object));
sourceobj->setPrivateGCThing(source);
return sourceobj;
}
JSObject*
Debugger::wrapSource(JSContext* cx, HandleScriptSource source)
{
assertSameCompartment(cx, object.get());
MOZ_ASSERT(cx->compartment() != source->compartment());
DependentAddPtr<SourceWeakMap> p(cx, sources, source);
if (!p) {
JSObject* sourceobj = newDebuggerSource(cx, source);
if (!sourceobj)
return nullptr;
if (!p.add(cx, sources, source, sourceobj))
return nullptr;
CrossCompartmentKey key(CrossCompartmentKey::DebuggerSource, object, source);
if (!object->compartment()->putWrapper(cx, key, ObjectValue(*sourceobj))) {
sources.remove(source);
ReportOutOfMemory(cx);
return nullptr;
}
}
MOZ_ASSERT(GetSourceReferent(p->value()) == source);
return p->value();
}
static bool
DebuggerSource_construct(JSContext* cx, unsigned argc, Value* vp)
{
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NO_CONSTRUCTOR,
"Debugger.Source");
return false;
}
static NativeObject*
DebuggerSource_checkThis(JSContext* cx, const CallArgs& args, const char* fnname)
{
JSObject* thisobj = NonNullObject(cx, args.thisv());
if (!thisobj)
return nullptr;
if (thisobj->getClass() != &DebuggerSource_class) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Source", fnname, thisobj->getClass()->name);
return nullptr;
}
NativeObject* nthisobj = &thisobj->as<NativeObject>();
if (!GetSourceReferent(thisobj)) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Frame", fnname, "prototype object");
return nullptr;
}
return nthisobj;
}
#define THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, fnname, args, obj, sourceObject) \
CallArgs args = CallArgsFromVp(argc, vp); \
RootedNativeObject obj(cx, DebuggerSource_checkThis(cx, args, fnname)); \
if (!obj) \
return false; \
RootedScriptSource sourceObject(cx, GetSourceReferent(obj)); \
if (!sourceObject) \
return false;
static bool
DebuggerSource_getText(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get text)", args, obj, sourceObject);
Value textv = obj->getReservedSlot(JSSLOT_DEBUGSOURCE_TEXT);
if (!textv.isUndefined()) {
MOZ_ASSERT(textv.isString());
args.rval().set(textv);
return true;
}
ScriptSource* ss = sourceObject->source();
bool hasSourceData = ss->hasSourceData();
if (!ss->hasSourceData() && !JSScript::loadSource(cx, ss, &hasSourceData))
return false;
JSString* str = hasSourceData ? ss->substring(cx, 0, ss->length())
: NewStringCopyZ<CanGC>(cx, "[no source]");
if (!str)
return false;
args.rval().setString(str);
obj->setReservedSlot(JSSLOT_DEBUGSOURCE_TEXT, args.rval());
return true;
}
static bool
DebuggerSource_getUrl(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get url)", args, obj, sourceObject);
ScriptSource* ss = sourceObject->source();
if (ss->filename()) {
JSString* str = NewStringCopyZ<CanGC>(cx, ss->filename());
if (!str)
return false;
args.rval().setString(str);
} else {
args.rval().setNull();
}
return true;
}
static bool
DebuggerSource_getDisplayURL(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get url)", args, obj, sourceObject);
ScriptSource* ss = sourceObject->source();
MOZ_ASSERT(ss);
if (ss->hasDisplayURL()) {
JSString* str = JS_NewUCStringCopyZ(cx, ss->displayURL());
if (!str)
return false;
args.rval().setString(str);
} else {
args.rval().setNull();
}
return true;
}
static bool
DebuggerSource_getElement(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get element)", args, obj, sourceObject);
if (sourceObject->element()) {
args.rval().setObjectOrNull(sourceObject->element());
if (!Debugger::fromChildJSObject(obj)->wrapDebuggeeValue(cx, args.rval()))
return false;
} else {
args.rval().setUndefined();
}
return true;
}
static bool
DebuggerSource_getElementProperty(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get elementAttributeName)", args, obj, sourceObject);
args.rval().set(sourceObject->elementAttributeName());
return Debugger::fromChildJSObject(obj)->wrapDebuggeeValue(cx, args.rval());
}
static bool
DebuggerSource_getIntroductionScript(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get introductionScript)", args, obj, sourceObject);
RootedScript script(cx, sourceObject->introductionScript());
if (script) {
RootedObject scriptDO(cx, Debugger::fromChildJSObject(obj)->wrapScript(cx, script));
if (!scriptDO)
return false;
args.rval().setObject(*scriptDO);
} else {
args.rval().setUndefined();
}
return true;
}
static bool
DebuggerSource_getIntroductionOffset(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get introductionOffset)", args, obj, sourceObject);
// Regardless of what's recorded in the ScriptSourceObject and
// ScriptSource, only hand out the introduction offset if we also have
// the script within which it applies.
ScriptSource* ss = sourceObject->source();
if (ss->hasIntroductionOffset() && sourceObject->introductionScript())
args.rval().setInt32(ss->introductionOffset());
else
args.rval().setUndefined();
return true;
}
static bool
DebuggerSource_getIntroductionType(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get introductionType)", args, obj, sourceObject);
ScriptSource* ss = sourceObject->source();
if (ss->hasIntroductionType()) {
JSString* str = NewStringCopyZ<CanGC>(cx, ss->introductionType());
if (!str)
return false;
args.rval().setString(str);
} else {
args.rval().setUndefined();
}
return true;
}
static bool
DebuggerSource_setSourceMapUrl(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "sourceMapURL", args, obj, sourceObject);
ScriptSource* ss = sourceObject->source();
MOZ_ASSERT(ss);
JSString* str = ToString<CanGC>(cx, args[0]);
if (!str)
return false;
AutoStableStringChars stableChars(cx);
if (!stableChars.initTwoByte(cx, str))
return false;
ss->setSourceMapURL(cx, stableChars.twoByteChars());
args.rval().setUndefined();
return true;
}
static bool
DebuggerSource_getSourceMapUrl(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get sourceMapURL)", args, obj, sourceObject);
ScriptSource* ss = sourceObject->source();
MOZ_ASSERT(ss);
if (ss->hasSourceMapURL()) {
JSString* str = JS_NewUCStringCopyZ(cx, ss->sourceMapURL());
if (!str)
return false;
args.rval().setString(str);
} else {
args.rval().setNull();
}
return true;
}
static bool
DebuggerSource_getCanonicalId(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGSOURCE_REFERENT(cx, argc, vp, "(get sourceMapURL)", args, obj, sourceObject);
ScriptSource* ss = sourceObject->source();
MOZ_ASSERT(ss);
static_assert(!mozilla::IsBaseOf<gc::Cell, ScriptSource>::value,
"We rely on ScriptSource* pointers to be stable, and not move in memory. "
"Currently, this holds true because ScriptSource is not managed by the GC. If "
"that changes, it doesn't necessarily mean that it will start moving, but we "
"will need a new assertion here. If we do start moving ScriptSources in memory, "
"then DebuggerSource_getCanonicalId will need to be reworked!");
auto id = uintptr_t(ss);
// IEEE 754 doubles can precisely store integers of up 53 bits. On 32 bit
// platforms, pointers trivially fit. On 64 bit platforms, pointers only use
// 48 bits so we are still good.
MOZ_ASSERT(Value::isNumberRepresentable(id));
args.rval().set(NumberValue(id));
return true;
}
static const JSPropertySpec DebuggerSource_properties[] = {
JS_PSG("text", DebuggerSource_getText, 0),
JS_PSG("url", DebuggerSource_getUrl, 0),
JS_PSG("element", DebuggerSource_getElement, 0),
JS_PSG("displayURL", DebuggerSource_getDisplayURL, 0),
JS_PSG("introductionScript", DebuggerSource_getIntroductionScript, 0),
JS_PSG("introductionOffset", DebuggerSource_getIntroductionOffset, 0),
JS_PSG("introductionType", DebuggerSource_getIntroductionType, 0),
JS_PSG("elementAttributeName", DebuggerSource_getElementProperty, 0),
JS_PSGS("sourceMapURL", DebuggerSource_getSourceMapUrl, DebuggerSource_setSourceMapUrl, 0),
JS_PSG("canonicalId", DebuggerSource_getCanonicalId, 0),
JS_PS_END
};
static const JSFunctionSpec DebuggerSource_methods[] = {
JS_FS_END
};
/*** Debugger.Frame ******************************************************************************/
static void
UpdateFrameIterPc(FrameIter& iter)
{
if (iter.abstractFramePtr().isRematerializedFrame()) {
#ifdef DEBUG
// Rematerialized frames don't need their pc updated. The reason we
// need to update pc is because we might get the same Debugger.Frame
// object for multiple re-entries into debugger code from debuggee
// code. This reentrancy is not possible with rematerialized frames,
// because when returning to debuggee code, we would have bailed out
// to baseline.
//
// We walk the stack to assert that it doesn't need updating.
jit::RematerializedFrame* frame = iter.abstractFramePtr().asRematerializedFrame();
jit::JitFrameLayout* jsFrame = (jit::JitFrameLayout*)frame->top();
jit::JitActivation* activation = iter.activation()->asJit();
ActivationIterator activationIter(activation->cx()->runtime());
while (activationIter.activation() != activation)
++activationIter;
jit::JitFrameIterator jitIter(activationIter);
while (!jitIter.isIonJS() || jitIter.jsFrame() != jsFrame)
++jitIter;
jit::InlineFrameIterator ionInlineIter(activation->cx(), &jitIter);
while (ionInlineIter.frameNo() != frame->frameNo())
++ionInlineIter;
MOZ_ASSERT(ionInlineIter.pc() == iter.pc());
#endif
return;
}
iter.updatePcQuadratic();
}
static void
DebuggerFrame_freeScriptFrameIterData(FreeOp* fop, JSObject* obj)
{
AbstractFramePtr frame = AbstractFramePtr::FromRaw(obj->as<NativeObject>().getPrivate());
if (frame.isScriptFrameIterData())
fop->delete_((ScriptFrameIter::Data*) frame.raw());
obj->as<NativeObject>().setPrivate(nullptr);
}
static void
DebuggerFrame_maybeDecrementFrameScriptStepModeCount(FreeOp* fop, AbstractFramePtr frame,
NativeObject* frameobj)
{
/* If this frame has an onStep handler, decrement the script's count. */
if (!frameobj->getReservedSlot(JSSLOT_DEBUGFRAME_ONSTEP_HANDLER).isUndefined())
frame.script()->decrementStepModeCount(fop);
}
static void
DebuggerFrame_finalize(FreeOp* fop, JSObject* obj)
{
DebuggerFrame_freeScriptFrameIterData(fop, obj);
}
const Class DebuggerFrame_class = {
"Frame", JSCLASS_HAS_PRIVATE | JSCLASS_HAS_RESERVED_SLOTS(JSSLOT_DEBUGFRAME_COUNT),
nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, nullptr, DebuggerFrame_finalize
};
static NativeObject*
CheckThisFrame(JSContext* cx, const CallArgs& args, const char* fnname, bool checkLive)
{
JSObject* thisobj = NonNullObject(cx, args.thisv());
if (!thisobj)
return nullptr;
if (thisobj->getClass() != &DebuggerFrame_class) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Frame", fnname, thisobj->getClass()->name);
return nullptr;
}
NativeObject* nthisobj = &thisobj->as<NativeObject>();
/*
* Forbid Debugger.Frame.prototype, which is of class DebuggerFrame_class
* but isn't really a working Debugger.Frame object. The prototype object
* is distinguished by having a nullptr private value. Also, forbid popped
* frames.
*/
if (!nthisobj->getPrivate()) {
if (nthisobj->getReservedSlot(JSSLOT_DEBUGFRAME_OWNER).isUndefined()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Frame", fnname, "prototype object");
return nullptr;
}
if (checkLive) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_NOT_LIVE,
"Debugger.Frame");
return nullptr;
}
}
return nthisobj;
}
/*
* To make frequently fired hooks like onEnterFrame more performant,
* Debugger.Frame methods should not create a ScriptFrameIter unless it
* absolutely needs to. That is, unless the method has to call a method on
* ScriptFrameIter that's otherwise not available on AbstractFramePtr.
*
* When a Debugger.Frame is first created, its private slot is set to the
* AbstractFramePtr itself. The first time the users asks for a
* ScriptFrameIter, we construct one, have it settle on the frame pointed to
* by the AbstractFramePtr and cache its internal Data in the Debugger.Frame
* object's private slot. Subsequent uses of the Debugger.Frame object will
* always create a ScriptFrameIter from the cached Data.
*
* Methods that only need the AbstractFramePtr should use THIS_FRAME.
* Methods that need a ScriptFrameIterator should use THIS_FRAME_ITER.
*/
#define THIS_FRAME_THISOBJ(cx, argc, vp, fnname, args, thisobj) \
CallArgs args = CallArgsFromVp(argc, vp); \
RootedNativeObject thisobj(cx, CheckThisFrame(cx, args, fnname, true)); \
if (!thisobj) \
return false
#define THIS_FRAME(cx, argc, vp, fnname, args, thisobj, frame) \
THIS_FRAME_THISOBJ(cx, argc, vp, fnname, args, thisobj); \
AbstractFramePtr frame = AbstractFramePtr::FromRaw(thisobj->getPrivate()); \
if (frame.isScriptFrameIterData()) { \
ScriptFrameIter iter(*(ScriptFrameIter::Data*)(frame.raw())); \
frame = iter.abstractFramePtr(); \
}
#define THIS_FRAME_ITER(cx, argc, vp, fnname, args, thisobj, maybeIter, iter) \
THIS_FRAME_THISOBJ(cx, argc, vp, fnname, args, thisobj); \
Maybe<ScriptFrameIter> maybeIter; \
{ \
AbstractFramePtr f = AbstractFramePtr::FromRaw(thisobj->getPrivate()); \
if (f.isScriptFrameIterData()) { \
maybeIter.emplace(*(ScriptFrameIter::Data*)(f.raw())); \
} else { \
maybeIter.emplace(cx, ScriptFrameIter::ALL_CONTEXTS, \
ScriptFrameIter::GO_THROUGH_SAVED, \
ScriptFrameIter::IGNORE_DEBUGGER_EVAL_PREV_LINK); \
ScriptFrameIter& iter = *maybeIter; \
while (!iter.hasUsableAbstractFramePtr() || iter.abstractFramePtr() != f) \
++iter; \
AbstractFramePtr data = iter.copyDataAsAbstractFramePtr(); \
if (!data) \
return false; \
thisobj->setPrivate(data.raw()); \
} \
} \
ScriptFrameIter& iter = *maybeIter
#define THIS_FRAME_OWNER(cx, argc, vp, fnname, args, thisobj, frame, dbg) \
THIS_FRAME(cx, argc, vp, fnname, args, thisobj, frame); \
Debugger* dbg = Debugger::fromChildJSObject(thisobj)
#define THIS_FRAME_OWNER_ITER(cx, argc, vp, fnname, args, thisobj, maybeIter, iter, dbg) \
THIS_FRAME_ITER(cx, argc, vp, fnname, args, thisobj, maybeIter, iter); \
Debugger* dbg = Debugger::fromChildJSObject(thisobj)
static bool
DebuggerFrame_getType(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "get type", args, thisobj, frame);
/*
* Indirect eval frames are both isGlobalFrame() and isEvalFrame(), so the
* order of checks here is significant.
*/
JSString* type;
if (frame.isEvalFrame())
type = cx->names().eval;
else if (frame.isGlobalFrame())
type = cx->names().global;
else if (frame.isFunctionFrame())
type = cx->names().call;
else if (frame.isModuleFrame())
type = cx->names().module;
else
MOZ_CRASH("Unknown frame type");
args.rval().setString(type);
return true;
}
static bool
DebuggerFrame_getImplementation(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "get implementation", args, thisobj, frame);
const char* s;
if (frame.isBaselineFrame())
s = "baseline";
else if (frame.isRematerializedFrame())
s = "ion";
else
s = "interpreter";
JSAtom* str = Atomize(cx, s, strlen(s));
if (!str)
return false;
args.rval().setString(str);
return true;
}
static bool
DebuggerFrame_getEnvironment(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME_OWNER_ITER(cx, argc, vp, "get environment", args, thisobj, _, iter, dbg);
Rooted<Env*> env(cx);
{
AutoCompartment ac(cx, iter.abstractFramePtr().scopeChain());
UpdateFrameIterPc(iter);
env = GetDebugScopeForFrame(cx, iter.abstractFramePtr(), iter.pc());
if (!env)
return false;
}
return dbg->wrapEnvironment(cx, env, args.rval());
}
static bool
DebuggerFrame_getCallee(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "get callee", args, thisobj, frame);
RootedValue calleev(cx, frame.isNonEvalFunctionFrame() ? frame.calleev() : NullValue());
if (!Debugger::fromChildJSObject(thisobj)->wrapDebuggeeValue(cx, &calleev))
return false;
args.rval().set(calleev);
return true;
}
static bool
DebuggerFrame_getGenerator(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "get generator", args, thisobj, frame);
args.rval().setBoolean(frame.script()->isGenerator());
return true;
}
static bool
DebuggerFrame_getConstructing(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME_ITER(cx, argc, vp, "get constructing", args, thisobj, _, iter);
args.rval().setBoolean(iter.isFunctionFrame() && iter.isConstructing());
return true;
}
static bool
DebuggerFrame_getThis(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME_ITER(cx, argc, vp, "get this", args, thisobj, _, iter);
RootedValue thisv(cx);
{
AbstractFramePtr frame = iter.abstractFramePtr();
AutoCompartment ac(cx, frame.scopeChain());
UpdateFrameIterPc(iter);
if (!GetThisValueForDebuggerMaybeOptimizedOut(cx, frame, iter.pc(), &thisv))
return false;
}
if (!Debugger::fromChildJSObject(thisobj)->wrapDebuggeeValue(cx, &thisv))
return false;
args.rval().set(thisv);
return true;
}
static bool
DebuggerFrame_getOlder(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME_ITER(cx, argc, vp, "get this", args, thisobj, _, iter);
Debugger* dbg = Debugger::fromChildJSObject(thisobj);
for (++iter; !iter.done(); ++iter) {
if (dbg->observesFrame(iter)) {
if (iter.isIon() && !iter.ensureHasRematerializedFrame(cx))
return false;
return dbg->getScriptFrame(cx, iter, args.rval());
}
}
args.rval().setNull();
return true;
}
const Class DebuggerArguments_class = {
"Arguments", JSCLASS_HAS_RESERVED_SLOTS(JSSLOT_DEBUGARGUMENTS_COUNT)
};
/* The getter used for each element of frame.arguments. See DebuggerFrame_getArguments. */
static bool
DebuggerArguments_getArg(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
int32_t i = args.callee().as<JSFunction>().getExtendedSlot(0).toInt32();
/* Check that the this value is an Arguments object. */
RootedObject argsobj(cx, NonNullObject(cx, args.thisv()));
if (!argsobj)
return false;
if (argsobj->getClass() != &DebuggerArguments_class) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Arguments", "getArgument", argsobj->getClass()->name);
return false;
}
/*
* Put the Debugger.Frame into the this-value slot, then use THIS_FRAME
* to check that it is still live and get the fp.
*/
args.setThis(argsobj->as<NativeObject>().getReservedSlot(JSSLOT_DEBUGARGUMENTS_FRAME));
THIS_FRAME(cx, argc, vp, "get argument", ca2, thisobj, frame);
/*
* Since getters can be extracted and applied to other objects,
* there is no guarantee this object has an ith argument.
*/
MOZ_ASSERT(i >= 0);
RootedValue arg(cx);
RootedScript script(cx);
if (unsigned(i) < frame.numActualArgs()) {
script = frame.script();
{
AutoCompartment ac(cx, script->compartment());
if (!script->ensureHasAnalyzedArgsUsage(cx))
return false;
}
if (unsigned(i) < frame.numFormalArgs() && script->formalIsAliased(i)) {
for (AliasedFormalIter fi(script); ; fi++) {
if (fi.frameIndex() == unsigned(i)) {
arg = frame.callObj().aliasedVar(fi);
break;
}
}
} else if (script->argsObjAliasesFormals() && frame.hasArgsObj()) {
arg = frame.argsObj().arg(i);
} else {
arg = frame.unaliasedActual(i, DONT_CHECK_ALIASING);
}
} else {
arg.setUndefined();
}
if (!Debugger::fromChildJSObject(thisobj)->wrapDebuggeeValue(cx, &arg))
return false;
args.rval().set(arg);
return true;
}
static bool
DebuggerFrame_getArguments(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "get arguments", args, thisobj, frame);
Value argumentsv = thisobj->getReservedSlot(JSSLOT_DEBUGFRAME_ARGUMENTS);
if (!argumentsv.isUndefined()) {
MOZ_ASSERT(argumentsv.isObjectOrNull());
args.rval().set(argumentsv);
return true;
}
RootedNativeObject argsobj(cx);
if (frame.hasArgs()) {
/* Create an arguments object. */
Rooted<GlobalObject*> global(cx, &args.callee().global());
RootedObject proto(cx, GlobalObject::getOrCreateArrayPrototype(cx, global));
if (!proto)
return false;
argsobj = NewNativeObjectWithGivenProto(cx, &DebuggerArguments_class, proto);
if (!argsobj)
return false;
SetReservedSlot(argsobj, JSSLOT_DEBUGARGUMENTS_FRAME, ObjectValue(*thisobj));
MOZ_ASSERT(frame.numActualArgs() <= 0x7fffffff);
unsigned fargc = frame.numActualArgs();
RootedValue fargcVal(cx, Int32Value(fargc));
if (!NativeDefineProperty(cx, argsobj, cx->names().length, fargcVal, nullptr, nullptr,
JSPROP_PERMANENT | JSPROP_READONLY))
{
return false;
}
Rooted<jsid> id(cx);
for (unsigned i = 0; i < fargc; i++) {
RootedFunction getobj(cx);
getobj = NewNativeFunction(cx, DebuggerArguments_getArg, 0, nullptr,
gc::AllocKind::FUNCTION_EXTENDED);
if (!getobj)
return false;
id = INT_TO_JSID(i);
if (!getobj ||
!NativeDefineProperty(cx, argsobj, id, UndefinedHandleValue,
JS_DATA_TO_FUNC_PTR(GetterOp, getobj.get()), nullptr,
JSPROP_ENUMERATE | JSPROP_SHARED | JSPROP_GETTER))
{
return false;
}
getobj->setExtendedSlot(0, Int32Value(i));
}
} else {
argsobj = nullptr;
}
args.rval().setObjectOrNull(argsobj);
thisobj->setReservedSlot(JSSLOT_DEBUGFRAME_ARGUMENTS, args.rval());
return true;
}
static bool
DebuggerFrame_getScript(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "get script", args, thisobj, frame);
Debugger* debug = Debugger::fromChildJSObject(thisobj);
RootedObject scriptObject(cx);
if (frame.isFunctionFrame() && !frame.isEvalFrame()) {
RootedFunction callee(cx, frame.callee());
if (callee->isInterpreted()) {
RootedScript script(cx, callee->nonLazyScript());
scriptObject = debug->wrapScript(cx, script);
if (!scriptObject)
return false;
}
} else {
/*
* We got eval, JS_Evaluate*, or JS_ExecuteScript non-function script
* frames.
*/
RootedScript script(cx, frame.script());
scriptObject = debug->wrapScript(cx, script);
if (!scriptObject)
return false;
}
args.rval().setObjectOrNull(scriptObject);
return true;
}
static bool
DebuggerFrame_getOffset(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME_ITER(cx, argc, vp, "get offset", args, thisobj, _, iter);
JSScript* script = iter.script();
UpdateFrameIterPc(iter);
jsbytecode* pc = iter.pc();
size_t offset = script->pcToOffset(pc);
args.rval().setNumber(double(offset));
return true;
}
static bool
DebuggerFrame_getLive(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
NativeObject* thisobj = CheckThisFrame(cx, args, "get live", false);
if (!thisobj)
return false;
bool hasFrame = !!thisobj->getPrivate();
args.rval().setBoolean(hasFrame);
return true;
}
static bool
IsValidHook(const Value& v)
{
return v.isUndefined() || (v.isObject() && v.toObject().isCallable());
}
static bool
DebuggerFrame_getOnStep(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "get onStep", args, thisobj, frame);
(void) frame; // Silence GCC warning
RootedValue handler(cx, thisobj->getReservedSlot(JSSLOT_DEBUGFRAME_ONSTEP_HANDLER));
MOZ_ASSERT(IsValidHook(handler));
args.rval().set(handler);
return true;
}
static bool
DebuggerFrame_setOnStep(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "set onStep", args, thisobj, frame);
if (!args.requireAtLeast(cx, "Debugger.Frame.set onStep", 1))
return false;
if (!IsValidHook(args[0])) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_CALLABLE_OR_UNDEFINED);
return false;
}
Value prior = thisobj->getReservedSlot(JSSLOT_DEBUGFRAME_ONSTEP_HANDLER);
if (!args[0].isUndefined() && prior.isUndefined()) {
// Single stepping toggled off->on.
AutoCompartment ac(cx, frame.scopeChain());
// Ensure observability *before* incrementing the step mode
// count. Calling this function after calling incrementStepModeCount
// will make it a no-op.
Debugger* dbg = Debugger::fromChildJSObject(thisobj);
if (!dbg->ensureExecutionObservabilityOfScript(cx, frame.script()))
return false;
if (!frame.script()->incrementStepModeCount(cx))
return false;
} else if (args[0].isUndefined() && !prior.isUndefined()) {
// Single stepping toggled on->off.
frame.script()->decrementStepModeCount(cx->runtime()->defaultFreeOp());
}
/* Now that the step mode switch has succeeded, we can install the handler. */
thisobj->setReservedSlot(JSSLOT_DEBUGFRAME_ONSTEP_HANDLER, args[0]);
args.rval().setUndefined();
return true;
}
static bool
DebuggerFrame_getOnPop(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "get onPop", args, thisobj, frame);
(void) frame; // Silence GCC warning
RootedValue handler(cx, thisobj->getReservedSlot(JSSLOT_DEBUGFRAME_ONPOP_HANDLER));
MOZ_ASSERT(IsValidHook(handler));
args.rval().set(handler);
return true;
}
static bool
DebuggerFrame_setOnPop(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME(cx, argc, vp, "set onPop", args, thisobj, frame);
if (!args.requireAtLeast(cx, "Debugger.Frame.set onPop", 1))
return false;
(void) frame; // Silence GCC warning
if (!IsValidHook(args[0])) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_CALLABLE_OR_UNDEFINED);
return false;
}
thisobj->setReservedSlot(JSSLOT_DEBUGFRAME_ONPOP_HANDLER, args[0]);
args.rval().setUndefined();
return true;
}
/*
* Evaluate |chars[0..length-1]| in the environment |env|, treating that
* source as appearing starting at |lineno| in |filename|. Store the return
* value in |*rval|. Use |thisv| as the 'this' value.
*
* If |frame| is non-nullptr, evaluate as for a direct eval in that frame; |env|
* must be either |frame|'s DebugScopeObject, or some extension of that
* environment; either way, |frame|'s scope is where newly declared variables
* go. In this case, |frame| must have a computed 'this' value, equal to |thisv|.
*/
static bool
EvaluateInEnv(JSContext* cx, Handle<Env*> env, AbstractFramePtr frame,
jsbytecode* pc, mozilla::Range<const char16_t> chars, const char* filename,
unsigned lineno, MutableHandleValue rval)
{
assertSameCompartment(cx, env, frame);
MOZ_ASSERT_IF(frame, pc);
/*
* Pass in a StaticEvalObject *not* linked to env for evalStaticScope, as
* ScopeIter should stop at any non-ScopeObject or non-syntactic With
* boundaries, and we are putting a DebugScopeProxy or non-syntactic With on
* the scope chain.
*/
Rooted<ScopeObject*> enclosingStaticScope(cx);
if (!IsGlobalLexicalScope(env)) {
// If we are doing a global evalWithBindings, we will still need to
// link the static global lexical scope to the static non-syntactic
// scope.
if (IsGlobalLexicalScope(env->enclosingScope()))
enclosingStaticScope = &cx->global()->lexicalScope().staticBlock();
enclosingStaticScope = StaticNonSyntacticScopeObjects::create(cx, enclosingStaticScope);
if (!enclosingStaticScope)
return false;
} else {
enclosingStaticScope = &cx->global()->lexicalScope().staticBlock();
}
// Do not consider executeInGlobal{WithBindings} as an eval, but instead
// as executing a series of statements at the global level. This is to
// circumvent the fresh lexical scope that all eval have, so that the
// users of executeInGlobal, like the web console, may add new bindings to
// the global scope.
Rooted<ScopeObject*> staticScope(cx);
if (frame) {
staticScope = StaticEvalObject::create(cx, enclosingStaticScope);
if (!staticScope)
return false;
} else {
staticScope = enclosingStaticScope;
}
CompileOptions options(cx);
options.setIsRunOnce(true)
.setForEval(true)
.setNoScriptRval(false)
.setFileAndLine(filename, lineno)
.setCanLazilyParse(false)
.setIntroductionType("debugger eval")
.maybeMakeStrictMode(frame ? frame.script()->strict() : false);
RootedScript callerScript(cx, frame ? frame.script() : nullptr);
SourceBufferHolder srcBuf(chars.start().get(), chars.length(), SourceBufferHolder::NoOwnership);
RootedScript script(cx, frontend::CompileScript(cx, &cx->tempLifoAlloc(), env, staticScope,
callerScript, options, srcBuf,
/* source = */ nullptr));
if (!script)
return false;
// Again, executeInGlobal is not considered eval.
if (frame) {
if (script->strict())
staticScope->as<StaticEvalObject>().setStrict();
script->setActiveEval();
}
ExecuteType type = !frame ? EXECUTE_GLOBAL : EXECUTE_DEBUG;
return ExecuteKernel(cx, script, *env, NullValue(), type, frame, rval.address());
}
enum EvalBindings { EvalHasExtraBindings = true, EvalWithDefaultBindings = false };
static bool
DebuggerGenericEval(JSContext* cx, const char* fullMethodName, const Value& code,
EvalBindings evalWithBindings, HandleValue bindings, HandleValue options,
MutableHandleValue vp, Debugger* dbg, HandleObject scope,
ScriptFrameIter* iter)
{
/* Either we're specifying the frame, or a global. */
MOZ_ASSERT_IF(iter, !scope);
MOZ_ASSERT_IF(!iter, scope && IsGlobalLexicalScope(scope));
/* Check the first argument, the eval code string. */
if (!code.isString()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
fullMethodName, "string", InformalValueTypeName(code));
return false;
}
RootedLinearString linear(cx, code.toString()->ensureLinear(cx));
if (!linear)
return false;
/*
* Gather keys and values of bindings, if any. This must be done in the
* debugger compartment, since that is where any exceptions must be
* thrown.
*/
AutoIdVector keys(cx);
AutoValueVector values(cx);
if (evalWithBindings) {
RootedObject bindingsobj(cx, NonNullObject(cx, bindings));
if (!bindingsobj ||
!GetPropertyKeys(cx, bindingsobj, JSITER_OWNONLY, &keys) ||
!values.growBy(keys.length()))
{
return false;
}
for (size_t i = 0; i < keys.length(); i++) {
MutableHandleValue valp = values[i];
if (!GetProperty(cx, bindingsobj, bindingsobj, keys[i], valp) ||
!dbg->unwrapDebuggeeValue(cx, valp))
{
return false;
}
}
}
/* Set options from object if provided. */
JSAutoByteString url_bytes;
char* url = nullptr;
unsigned lineNumber = 1;
if (options.isObject()) {
RootedObject opts(cx, &options.toObject());
RootedValue v(cx);
if (!JS_GetProperty(cx, opts, "url", &v))
return false;
if (!v.isUndefined()) {
RootedString url_str(cx, ToString<CanGC>(cx, v));
if (!url_str)
return false;
url = url_bytes.encodeLatin1(cx, url_str);
if (!url)
return false;
}
if (!JS_GetProperty(cx, opts, "lineNumber", &v))
return false;
if (!v.isUndefined()) {
uint32_t lineno;
if (!ToUint32(cx, v, &lineno))
return false;
lineNumber = lineno;
}
}
Maybe<AutoCompartment> ac;
if (iter)
ac.emplace(cx, iter->scopeChain(cx));
else
ac.emplace(cx, scope);
Rooted<Env*> env(cx);
if (iter) {
env = GetDebugScopeForFrame(cx, iter->abstractFramePtr(), iter->pc());
if (!env)
return false;
} else {
env = scope;
}
/* If evalWithBindings, create the inner environment. */
if (evalWithBindings) {
RootedPlainObject nenv(cx, NewObjectWithGivenProto<PlainObject>(cx, nullptr));
if (!nenv)
return false;
RootedId id(cx);
for (size_t i = 0; i < keys.length(); i++) {
id = keys[i];
MutableHandleValue val = values[i];
if (!cx->compartment()->wrap(cx, val) ||
!NativeDefineProperty(cx, nenv, id, val, nullptr, nullptr, 0))
{
return false;
}
}
AutoObjectVector scopeChain(cx);
if (!scopeChain.append(nenv))
return false;
RootedObject dynamicScope(cx);
if (!CreateScopeObjectsForScopeChain(cx, scopeChain, env, &dynamicScope))
return false;
env = dynamicScope;
}
/* Run the code and produce the completion value. */
RootedValue rval(cx);
AbstractFramePtr frame = iter ? iter->abstractFramePtr() : NullFramePtr();
jsbytecode* pc = iter ? iter->pc() : nullptr;
AutoStableStringChars stableChars(cx);
if (!stableChars.initTwoByte(cx, linear))
return false;
mozilla::Range<const char16_t> chars = stableChars.twoByteRange();
bool ok = EvaluateInEnv(cx, env, frame, pc, chars, url ? url : "debugger eval code",
lineNumber, &rval);
return dbg->receiveCompletionValue(ac, ok, rval, vp);
}
static bool
DebuggerFrame_eval(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME_ITER(cx, argc, vp, "eval", args, thisobj, _, iter);
if (!args.requireAtLeast(cx, "Debugger.Frame.prototype.eval", 1))
return false;
Debugger* dbg = Debugger::fromChildJSObject(thisobj);
UpdateFrameIterPc(iter);
return DebuggerGenericEval(cx, "Debugger.Frame.prototype.eval",
args[0], EvalWithDefaultBindings, JS::UndefinedHandleValue,
args.get(1), args.rval(), dbg, nullptr, &iter);
}
static bool
DebuggerFrame_evalWithBindings(JSContext* cx, unsigned argc, Value* vp)
{
THIS_FRAME_ITER(cx, argc, vp, "evalWithBindings", args, thisobj, _, iter);
if (!args.requireAtLeast(cx, "Debugger.Frame.prototype.evalWithBindings", 2))
return false;
Debugger* dbg = Debugger::fromChildJSObject(thisobj);
UpdateFrameIterPc(iter);
return DebuggerGenericEval(cx, "Debugger.Frame.prototype.evalWithBindings",
args[0], EvalHasExtraBindings, args[1], args.get(2),
args.rval(), dbg, nullptr, &iter);
}
static bool
DebuggerFrame_construct(JSContext* cx, unsigned argc, Value* vp)
{
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NO_CONSTRUCTOR,
"Debugger.Frame");
return false;
}
static const JSPropertySpec DebuggerFrame_properties[] = {
JS_PSG("arguments", DebuggerFrame_getArguments, 0),
JS_PSG("callee", DebuggerFrame_getCallee, 0),
JS_PSG("constructing", DebuggerFrame_getConstructing, 0),
JS_PSG("environment", DebuggerFrame_getEnvironment, 0),
JS_PSG("generator", DebuggerFrame_getGenerator, 0),
JS_PSG("live", DebuggerFrame_getLive, 0),
JS_PSG("offset", DebuggerFrame_getOffset, 0),
JS_PSG("older", DebuggerFrame_getOlder, 0),
JS_PSG("script", DebuggerFrame_getScript, 0),
JS_PSG("this", DebuggerFrame_getThis, 0),
JS_PSG("type", DebuggerFrame_getType, 0),
JS_PSG("implementation", DebuggerFrame_getImplementation, 0),
JS_PSGS("onStep", DebuggerFrame_getOnStep, DebuggerFrame_setOnStep, 0),
JS_PSGS("onPop", DebuggerFrame_getOnPop, DebuggerFrame_setOnPop, 0),
JS_PS_END
};
static const JSFunctionSpec DebuggerFrame_methods[] = {
JS_FN("eval", DebuggerFrame_eval, 1, 0),
JS_FN("evalWithBindings", DebuggerFrame_evalWithBindings, 1, 0),
JS_FS_END
};
/*** Debugger.Object *****************************************************************************/
void
DebuggerObject_trace(JSTracer* trc, JSObject* obj)
{
/*
* There is a barrier on private pointers, so the Unbarriered marking
* is okay.
*/
if (JSObject* referent = (JSObject*) obj->as<NativeObject>().getPrivate()) {
TraceManuallyBarrieredCrossCompartmentEdge(trc, obj, &referent,
"Debugger.Object referent");
obj->as<NativeObject>().setPrivateUnbarriered(referent);
}
}
const Class DebuggerObject_class = {
"Object",
JSCLASS_HAS_PRIVATE |
JSCLASS_HAS_RESERVED_SLOTS(JSSLOT_DEBUGOBJECT_COUNT),
nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, nullptr, nullptr,
nullptr, /* call */
nullptr, /* hasInstance */
nullptr, /* construct */
DebuggerObject_trace
};
static NativeObject*
DebuggerObject_checkThis(JSContext* cx, const CallArgs& args, const char* fnname)
{
JSObject* thisobj = NonNullObject(cx, args.thisv());
if (!thisobj)
return nullptr;
if (thisobj->getClass() != &DebuggerObject_class) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Object", fnname, thisobj->getClass()->name);
return nullptr;
}
/*
* Forbid Debugger.Object.prototype, which is of class DebuggerObject_class
* but isn't a real working Debugger.Object. The prototype object is
* distinguished by having no referent.
*/
NativeObject* nthisobj = &thisobj->as<NativeObject>();
if (!nthisobj->getPrivate()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Object", fnname, "prototype object");
return nullptr;
}
return nthisobj;
}
#define THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, fnname, args, obj) \
CallArgs args = CallArgsFromVp(argc, vp); \
RootedObject obj(cx, DebuggerObject_checkThis(cx, args, fnname)); \
if (!obj) \
return false; \
obj = (JSObject*) obj->as<NativeObject>().getPrivate(); \
MOZ_ASSERT(obj)
#define THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, fnname, args, dbg, obj) \
CallArgs args = CallArgsFromVp(argc, vp); \
RootedObject obj(cx, DebuggerObject_checkThis(cx, args, fnname)); \
if (!obj) \
return false; \
Debugger* dbg = Debugger::fromChildJSObject(obj); \
obj = (JSObject*) obj->as<NativeObject>().getPrivate(); \
MOZ_ASSERT(obj)
static bool
DebuggerObject_construct(JSContext* cx, unsigned argc, Value* vp)
{
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NO_CONSTRUCTOR,
"Debugger.Object");
return false;
}
static bool
DebuggerObject_getProto(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get proto", args, dbg, refobj);
RootedObject proto(cx);
{
AutoCompartment ac(cx, refobj);
if (!GetPrototype(cx, refobj, &proto))
return false;
}
RootedValue protov(cx, ObjectOrNullValue(proto));
if (!dbg->wrapDebuggeeValue(cx, &protov))
return false;
args.rval().set(protov);
return true;
}
static bool
DebuggerObject_getClass(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, "get class", args, refobj);
const char* className;
{
AutoCompartment ac(cx, refobj);
className = GetObjectClassName(cx, refobj);
}
JSAtom* str = Atomize(cx, className, strlen(className));
if (!str)
return false;
args.rval().setString(str);
return true;
}
static bool
DebuggerObject_getCallable(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, "get callable", args, refobj);
args.rval().setBoolean(refobj->isCallable());
return true;
}
static bool
DebuggerObject_getName(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get name", args, dbg, obj);
if (!obj->is<JSFunction>()) {
args.rval().setUndefined();
return true;
}
JSString* name = obj->as<JSFunction>().atom();
if (!name) {
args.rval().setUndefined();
return true;
}
RootedValue namev(cx, StringValue(name));
if (!dbg->wrapDebuggeeValue(cx, &namev))
return false;
args.rval().set(namev);
return true;
}
static bool
DebuggerObject_getDisplayName(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get display name", args, dbg, obj);
if (!obj->is<JSFunction>()) {
args.rval().setUndefined();
return true;
}
JSString* name = obj->as<JSFunction>().displayAtom();
if (!name) {
args.rval().setUndefined();
return true;
}
RootedValue namev(cx, StringValue(name));
if (!dbg->wrapDebuggeeValue(cx, &namev))
return false;
args.rval().set(namev);
return true;
}
static bool
DebuggerObject_getParameterNames(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get parameterNames", args, dbg, obj);
if (!obj->is<JSFunction>()) {
args.rval().setUndefined();
return true;
}
RootedFunction fun(cx, &obj->as<JSFunction>());
/* Only hand out parameter info for debuggee functions. */
if (!dbg->observesGlobal(&fun->global())) {
args.rval().setUndefined();
return true;
}
RootedArrayObject result(cx, NewDenseFullyAllocatedArray(cx, fun->nargs()));
if (!result)
return false;
result->ensureDenseInitializedLength(cx, 0, fun->nargs());
if (fun->isInterpreted()) {
RootedScript script(cx, GetOrCreateFunctionScript(cx, fun));
if (!script)
return false;
MOZ_ASSERT(fun->nargs() == script->bindings.numArgs());
if (fun->nargs() > 0) {
BindingIter bi(script);
for (size_t i = 0; i < fun->nargs(); i++, bi++) {
MOZ_ASSERT(bi.argIndex() == i);
Value v;
if (bi->name()->length() == 0)
v = UndefinedValue();
else
v = StringValue(bi->name());
result->setDenseElement(i, v);
}
}
} else {
for (size_t i = 0; i < fun->nargs(); i++)
result->setDenseElement(i, UndefinedValue());
}
args.rval().setObject(*result);
return true;
}
static bool
DebuggerObject_getScript(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get script", args, dbg, obj);
if (!obj->is<JSFunction>()) {
args.rval().setUndefined();
return true;
}
RootedFunction fun(cx, &obj->as<JSFunction>());
if (!fun->isInterpreted()) {
args.rval().setUndefined();
return true;
}
RootedScript script(cx, GetOrCreateFunctionScript(cx, fun));
if (!script)
return false;
/* Only hand out debuggee scripts. */
if (!dbg->observesScript(script)) {
args.rval().setNull();
return true;
}
RootedObject scriptObject(cx, dbg->wrapScript(cx, script));
if (!scriptObject)
return false;
args.rval().setObject(*scriptObject);
return true;
}
static bool
DebuggerObject_getEnvironment(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get environment", args, dbg, obj);
/* Don't bother switching compartments just to check obj's type and get its env. */
if (!obj->is<JSFunction>() || !obj->as<JSFunction>().isInterpreted()) {
args.rval().setUndefined();
return true;
}
/* Only hand out environments of debuggee functions. */
if (!dbg->observesGlobal(&obj->global())) {
args.rval().setNull();
return true;
}
Rooted<Env*> env(cx);
{
AutoCompartment ac(cx, obj);
RootedFunction fun(cx, &obj->as<JSFunction>());
env = GetDebugScopeForFunction(cx, fun);
if (!env)
return false;
}
return dbg->wrapEnvironment(cx, env, args.rval());
}
static bool
DebuggerObject_getIsArrowFunction(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, "get isArrowFunction", args, refobj);
args.rval().setBoolean(refobj->is<JSFunction>()
&& refobj->as<JSFunction>().isArrow());
return true;
}
static bool
DebuggerObject_getIsBoundFunction(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, "get isBoundFunction", args, refobj);
args.rval().setBoolean(refobj->isBoundFunction());
return true;
}
static bool
DebuggerObject_getBoundTargetFunction(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get boundFunctionTarget", args, dbg, refobj);
if (!refobj->isBoundFunction()) {
args.rval().setUndefined();
return true;
}
args.rval().setObject(*refobj->as<JSFunction>().getBoundFunctionTarget());
return dbg->wrapDebuggeeValue(cx, args.rval());
}
static bool
DebuggerObject_getBoundThis(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get boundThis", args, dbg, refobj);
if (!refobj->isBoundFunction()) {
args.rval().setUndefined();
return true;
}
args.rval().set(refobj->as<JSFunction>().getBoundFunctionThis());
return dbg->wrapDebuggeeValue(cx, args.rval());
}
static bool
DebuggerObject_getBoundArguments(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get boundArguments", args, dbg, refobj);
if (!refobj->isBoundFunction()) {
args.rval().setUndefined();
return true;
}
Rooted<JSFunction*> fun(cx, &refobj->as<JSFunction>());
size_t length = fun->getBoundFunctionArgumentCount();
AutoValueVector boundArgs(cx);
if (!boundArgs.resize(length))
return false;
for (size_t i = 0; i < length; i++) {
boundArgs[i].set(fun->getBoundFunctionArgument(i));
if (!dbg->wrapDebuggeeValue(cx, boundArgs[i]))
return false;
}
JSObject* aobj = NewDenseCopiedArray(cx, boundArgs.length(), boundArgs.begin());
if (!aobj)
return false;
args.rval().setObject(*aobj);
return true;
}
static bool
DebuggerObject_getGlobal(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "get global", args, dbg, obj);
RootedValue v(cx, ObjectValue(obj->global()));
if (!dbg->wrapDebuggeeValue(cx, &v))
return false;
args.rval().set(v);
return true;
}
static bool
null(CallArgs& args)
{
args.rval().setNull();
return true;
}
/* static */ SavedFrame*
Debugger::getObjectAllocationSite(JSObject& obj)
{
JSObject* metadata = GetObjectMetadata(&obj);
if (!metadata)
return nullptr;
MOZ_ASSERT(!metadata->is<WrapperObject>());
return SavedFrame::isSavedFrameAndNotProto(*metadata)
? &metadata->as<SavedFrame>()
: nullptr;
}
static bool
DebuggerObject_getAllocationSite(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, "get allocationSite", args, obj);
RootedObject allocSite(cx, Debugger::getObjectAllocationSite(*obj));
if (!allocSite)
return null(args);
if (!cx->compartment()->wrap(cx, &allocSite))
return false;
args.rval().setObject(*allocSite);
return true;
}
static bool
DebuggerObject_getOwnPropertyDescriptor(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "getOwnPropertyDescriptor", args, dbg, obj);
RootedId id(cx);
if (!ValueToId<CanGC>(cx, args.get(0), &id))
return false;
/* Bug: This can cause the debuggee to run! */
Rooted<PropertyDescriptor> desc(cx);
{
Maybe<AutoCompartment> ac;
ac.emplace(cx, obj);
ErrorCopier ec(ac);
if (!GetOwnPropertyDescriptor(cx, obj, id, &desc))
return false;
}
if (desc.object()) {
/* Rewrap the debuggee values in desc for the debugger. */
if (!dbg->wrapDebuggeeValue(cx, desc.value()))
return false;
if (desc.hasGetterObject()) {
RootedValue get(cx, ObjectOrNullValue(desc.getterObject()));
if (!dbg->wrapDebuggeeValue(cx, &get))
return false;
desc.setGetterObject(get.toObjectOrNull());
}
if (desc.hasSetterObject()) {
RootedValue set(cx, ObjectOrNullValue(desc.setterObject()));
if (!dbg->wrapDebuggeeValue(cx, &set))
return false;
desc.setSetterObject(set.toObjectOrNull());
}
}
return FromPropertyDescriptor(cx, desc, args.rval());
}
static bool
getOwnPropertyKeys(JSContext* cx, unsigned argc, unsigned flags, Value* vp)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, "getOwnPropertyKeys", args, obj);
AutoIdVector keys(cx);
{
Maybe<AutoCompartment> ac;
ac.emplace(cx, obj);
ErrorCopier ec(ac);
if (!GetPropertyKeys(cx, obj, flags, &keys))
return false;
}
AutoValueVector vals(cx);
if (!vals.resize(keys.length()))
return false;
for (size_t i = 0, len = keys.length(); i < len; i++) {
jsid id = keys[i];
if (JSID_IS_INT(id)) {
JSString* str = Int32ToString<CanGC>(cx, JSID_TO_INT(id));
if (!str)
return false;
vals[i].setString(str);
} else if (JSID_IS_ATOM(id)) {
vals[i].setString(JSID_TO_STRING(id));
} else if (JSID_IS_SYMBOL(id)) {
vals[i].setSymbol(JSID_TO_SYMBOL(id));
} else {
MOZ_ASSERT_UNREACHABLE("GetPropertyKeys must return only string, int, and Symbol jsids");
}
}
JSObject* aobj = NewDenseCopiedArray(cx, vals.length(), vals.begin());
if (!aobj)
return false;
args.rval().setObject(*aobj);
return true;
}
static bool
DebuggerObject_getOwnPropertyNames(JSContext* cx, unsigned argc, Value* vp) {
return getOwnPropertyKeys(cx, argc, JSITER_OWNONLY | JSITER_HIDDEN, vp);
}
static bool
DebuggerObject_getOwnPropertySymbols(JSContext* cx, unsigned argc, Value* vp) {
return getOwnPropertyKeys(cx, argc,
JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS | JSITER_SYMBOLSONLY,
vp);
}
static bool
DebuggerObject_defineProperty(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "defineProperty", args, dbg, obj);
if (!args.requireAtLeast(cx, "Debugger.Object.defineProperty", 2))
return false;
RootedId id(cx);
if (!ValueToId<CanGC>(cx, args[0], &id))
return false;
Rooted<PropertyDescriptor> desc(cx);
if (!ToPropertyDescriptor(cx, args[1], false, &desc))
return false;
if (!dbg->unwrapPropertyDescriptor(cx, obj, &desc))
return false;
if (!CheckPropertyDescriptorAccessors(cx, desc))
return false;
{
Maybe<AutoCompartment> ac;
ac.emplace(cx, obj);
if (!cx->compartment()->wrap(cx, &desc))
return false;
ErrorCopier ec(ac);
if (!DefineProperty(cx, obj, id, desc))
return false;
}
args.rval().setUndefined();
return true;
}
static bool
DebuggerObject_defineProperties(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "defineProperties", args, dbg, obj);
if (!args.requireAtLeast(cx, "Debugger.Object.defineProperties", 1))
return false;
RootedValue arg(cx, args[0]);
RootedObject props(cx, ToObject(cx, arg));
if (!props)
return false;
AutoIdVector ids(cx);
Rooted<PropertyDescriptorVector> descs(cx, PropertyDescriptorVector(cx));
if (!ReadPropertyDescriptors(cx, props, false, &ids, &descs))
return false;
size_t n = ids.length();
for (size_t i = 0; i < n; i++) {
if (!dbg->unwrapPropertyDescriptor(cx, obj, descs[i]))
return false;
if (!CheckPropertyDescriptorAccessors(cx, descs[i]))
return false;
}
{
Maybe<AutoCompartment> ac;
ac.emplace(cx, obj);
for (size_t i = 0; i < n; i++) {
if (!cx->compartment()->wrap(cx, descs[i]))
return false;
}
ErrorCopier ec(ac);
for (size_t i = 0; i < n; i++) {
if (!DefineProperty(cx, obj, ids[i], descs[i]))
return false;
}
}
args.rval().setUndefined();
return true;
}
/*
* This does a non-strict delete, as a matter of API design. The case where the
* property is non-configurable isn't necessarily exceptional here.
*/
static bool
DebuggerObject_deleteProperty(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, "deleteProperty", args, obj);
RootedId id(cx);
if (!ValueToId<CanGC>(cx, args.get(0), &id))
return false;
Maybe<AutoCompartment> ac;
ac.emplace(cx, obj);
ErrorCopier ec(ac);
ObjectOpResult result;
if (!DeleteProperty(cx, obj, id, result))
return false;
args.rval().setBoolean(result.ok());
return true;
}
enum SealHelperOp { OpSeal, OpFreeze, OpPreventExtensions };
static bool
DebuggerObject_sealHelper(JSContext* cx, unsigned argc, Value* vp, SealHelperOp op, const char* name)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, name, args, obj);
Maybe<AutoCompartment> ac;
ac.emplace(cx, obj);
ErrorCopier ec(ac);
if (op == OpSeal) {
if (!SetIntegrityLevel(cx, obj, IntegrityLevel::Sealed))
return false;
} else if (op == OpFreeze) {
if (!SetIntegrityLevel(cx, obj, IntegrityLevel::Frozen))
return false;
} else {
MOZ_ASSERT(op == OpPreventExtensions);
if (!PreventExtensions(cx, obj))
return false;
}
args.rval().setUndefined();
return true;
}
static bool
DebuggerObject_seal(JSContext* cx, unsigned argc, Value* vp)
{
return DebuggerObject_sealHelper(cx, argc, vp, OpSeal, "seal");
}
static bool
DebuggerObject_freeze(JSContext* cx, unsigned argc, Value* vp)
{
return DebuggerObject_sealHelper(cx, argc, vp, OpFreeze, "freeze");
}
static bool
DebuggerObject_preventExtensions(JSContext* cx, unsigned argc, Value* vp)
{
return DebuggerObject_sealHelper(cx, argc, vp, OpPreventExtensions, "preventExtensions");
}
static bool
DebuggerObject_isSealedHelper(JSContext* cx, unsigned argc, Value* vp, SealHelperOp op,
const char* name)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, name, args, obj);
Maybe<AutoCompartment> ac;
ac.emplace(cx, obj);
ErrorCopier ec(ac);
bool r;
if (op == OpSeal) {
if (!TestIntegrityLevel(cx, obj, IntegrityLevel::Sealed, &r))
return false;
} else if (op == OpFreeze) {
if (!TestIntegrityLevel(cx, obj, IntegrityLevel::Frozen, &r))
return false;
} else {
if (!IsExtensible(cx, obj, &r))
return false;
}
args.rval().setBoolean(r);
return true;
}
static bool
DebuggerObject_isSealed(JSContext* cx, unsigned argc, Value* vp)
{
return DebuggerObject_isSealedHelper(cx, argc, vp, OpSeal, "isSealed");
}
static bool
DebuggerObject_isFrozen(JSContext* cx, unsigned argc, Value* vp)
{
return DebuggerObject_isSealedHelper(cx, argc, vp, OpFreeze, "isFrozen");
}
static bool
DebuggerObject_isExtensible(JSContext* cx, unsigned argc, Value* vp)
{
return DebuggerObject_isSealedHelper(cx, argc, vp, OpPreventExtensions, "isExtensible");
}
enum ApplyOrCallMode { ApplyMode, CallMode };
static bool
ApplyOrCall(JSContext* cx, unsigned argc, Value* vp, ApplyOrCallMode mode)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "apply", args, dbg, obj);
/*
* Any JS exceptions thrown must be in the debugger compartment, so do
* sanity checks and fallible conversions before entering the debuggee.
*/
RootedValue calleev(cx, ObjectValue(*obj));
if (!obj->isCallable()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Object", "apply", obj->getClass()->name);
return false;
}
/*
* Unwrap Debugger.Objects. This happens in the debugger's compartment since
* that is where any exceptions must be reported.
*/
RootedValue thisv(cx, args.get(0));
if (!dbg->unwrapDebuggeeValue(cx, &thisv))
return false;
unsigned callArgc = 0;
Value* callArgv = nullptr;
AutoValueVector argv(cx);
if (mode == ApplyMode) {
if (args.length() >= 2 && !args[1].isNullOrUndefined()) {
if (!args[1].isObject()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_BAD_APPLY_ARGS,
js_apply_str);
return false;
}
RootedObject argsobj(cx, &args[1].toObject());
if (!GetLengthProperty(cx, argsobj, &callArgc))
return false;
callArgc = unsigned(Min(callArgc, ARGS_LENGTH_MAX));
if (!argv.growBy(callArgc) || !GetElements(cx, argsobj, callArgc, argv.begin()))
return false;
callArgv = argv.begin();
}
} else {
callArgc = args.length() > 0 ? unsigned(Min(args.length() - 1, ARGS_LENGTH_MAX)) : 0;
callArgv = args.array() + 1;
}
AutoArrayRooter callArgvRooter(cx, callArgc, callArgv);
for (unsigned i = 0; i < callArgc; i++) {
if (!dbg->unwrapDebuggeeValue(cx, callArgvRooter.handleAt(i)))
return false;
}
/*
* Enter the debuggee compartment and rewrap all input value for that compartment.
* (Rewrapping always takes place in the destination compartment.)
*/
Maybe<AutoCompartment> ac;
ac.emplace(cx, obj);
if (!cx->compartment()->wrap(cx, &calleev) || !cx->compartment()->wrap(cx, &thisv))
return false;
RootedValue arg(cx);
for (unsigned i = 0; i < callArgc; i++) {
if (!cx->compartment()->wrap(cx, callArgvRooter.handleAt(i)))
return false;
}
/*
* Call the function. Use receiveCompletionValue to return to the debugger
* compartment and populate args.rval().
*/
RootedValue rval(cx);
bool ok = Invoke(cx, thisv, calleev, callArgc, callArgv, &rval);
return dbg->receiveCompletionValue(ac, ok, rval, args.rval());
}
static bool
DebuggerObject_apply(JSContext* cx, unsigned argc, Value* vp)
{
return ApplyOrCall(cx, argc, vp, ApplyMode);
}
static bool
DebuggerObject_call(JSContext* cx, unsigned argc, Value* vp)
{
return ApplyOrCall(cx, argc, vp, CallMode);
}
static bool
DebuggerObject_makeDebuggeeValue(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "makeDebuggeeValue", args, dbg, referent);
if (!args.requireAtLeast(cx, "Debugger.Object.prototype.makeDebuggeeValue", 1))
return false;
RootedValue arg0(cx, args[0]);
/* Non-objects are already debuggee values. */
if (arg0.isObject()) {
// Enter this Debugger.Object's referent's compartment, and wrap the
// argument as appropriate for references from there.
{
AutoCompartment ac(cx, referent);
if (!cx->compartment()->wrap(cx, &arg0))
return false;
}
// Back in the debugger's compartment, produce a new Debugger.Object
// instance referring to the wrapped argument.
if (!dbg->wrapDebuggeeValue(cx, &arg0))
return false;
}
args.rval().set(arg0);
return true;
}
static bool
RequireGlobalObject(JSContext* cx, HandleValue dbgobj, HandleObject referent)
{
RootedObject obj(cx, referent);
if (!obj->is<GlobalObject>()) {
const char* isWrapper = "";
const char* isWindowProxy = "";
/* Help the poor programmer by pointing out wrappers around globals... */
if (obj->is<WrapperObject>()) {
obj = js::UncheckedUnwrap(obj);
isWrapper = "a wrapper around ";
}
/* ... and WindowProxies around Windows. */
if (IsWindowProxy(obj)) {
obj = ToWindowIfWindowProxy(obj);
isWindowProxy = "a WindowProxy referring to ";
}
if (obj->is<GlobalObject>()) {
ReportValueErrorFlags(cx, JSREPORT_ERROR, JSMSG_DEBUG_WRAPPER_IN_WAY,
JSDVG_SEARCH_STACK, dbgobj, nullptr,
isWrapper, isWindowProxy);
} else {
ReportValueErrorFlags(cx, JSREPORT_ERROR, JSMSG_DEBUG_BAD_REFERENT,
JSDVG_SEARCH_STACK, dbgobj, nullptr,
"a global object", nullptr);
}
return false;
}
return true;
}
static bool
DebuggerObject_executeInGlobal(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "executeInGlobal", args, dbg, referent);
if (!args.requireAtLeast(cx, "Debugger.Object.prototype.executeInGlobal", 1))
return false;
if (!RequireGlobalObject(cx, args.thisv(), referent))
return false;
RootedObject globalLexical(cx, &referent->as<GlobalObject>().lexicalScope());
return DebuggerGenericEval(cx, "Debugger.Object.prototype.executeInGlobal",
args[0], EvalWithDefaultBindings, JS::UndefinedHandleValue,
args.get(1), args.rval(), dbg, globalLexical, nullptr);
}
static bool
DebuggerObject_executeInGlobalWithBindings(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "executeInGlobalWithBindings", args, dbg,
referent);
if (!args.requireAtLeast(cx, "Debugger.Object.prototype.executeInGlobalWithBindings", 2))
return false;
if (!RequireGlobalObject(cx, args.thisv(), referent))
return false;
RootedObject globalLexical(cx, &referent->as<GlobalObject>().lexicalScope());
return DebuggerGenericEval(cx, "Debugger.Object.prototype.executeInGlobalWithBindings",
args[0], EvalHasExtraBindings, args[1], args.get(2),
args.rval(), dbg, globalLexical, nullptr);
}
static bool
DebuggerObject_asEnvironment(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "asEnvironment", args, dbg, referent);
if (!RequireGlobalObject(cx, args.thisv(), referent))
return false;
Rooted<Env*> env(cx);
{
AutoCompartment ac(cx, referent);
env = GetDebugScopeForGlobalLexicalScope(cx);
if (!env)
return false;
}
return dbg->wrapEnvironment(cx, env, args.rval());
}
static bool
DebuggerObject_unwrap(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_OWNER_REFERENT(cx, argc, vp, "unwrap", args, dbg, referent);
JSObject* unwrapped = UnwrapOneChecked(referent);
if (!unwrapped) {
args.rval().setNull();
return true;
}
// Don't allow unwrapping to create a D.O whose referent is in an
// invisible-to-Debugger global. (If our referent is a *wrapper* to such,
// and the wrapper is in a visible compartment, that's fine.)
JSCompartment* unwrappedCompartment = unwrapped->compartment();
if (unwrappedCompartment->options().invisibleToDebugger()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr,
JSMSG_DEBUG_INVISIBLE_COMPARTMENT);
return false;
}
args.rval().setObject(*unwrapped);
if (!dbg->wrapDebuggeeValue(cx, args.rval()))
return false;
return true;
}
static bool
DebuggerObject_unsafeDereference(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGOBJECT_REFERENT(cx, argc, vp, "unsafeDereference", args, referent);
args.rval().setObject(*referent);
if (!cx->compartment()->wrap(cx, args.rval()))
return false;
// Wrapping should return the WindowProxy.
MOZ_ASSERT(!IsWindow(&args.rval().toObject()));
return true;
}
static const JSPropertySpec DebuggerObject_properties[] = {
JS_PSG("proto", DebuggerObject_getProto, 0),
JS_PSG("class", DebuggerObject_getClass, 0),
JS_PSG("callable", DebuggerObject_getCallable, 0),
JS_PSG("name", DebuggerObject_getName, 0),
JS_PSG("displayName", DebuggerObject_getDisplayName, 0),
JS_PSG("parameterNames", DebuggerObject_getParameterNames, 0),
JS_PSG("script", DebuggerObject_getScript, 0),
JS_PSG("environment", DebuggerObject_getEnvironment, 0),
JS_PSG("isArrowFunction", DebuggerObject_getIsArrowFunction, 0),
JS_PSG("isBoundFunction", DebuggerObject_getIsBoundFunction, 0),
JS_PSG("boundTargetFunction", DebuggerObject_getBoundTargetFunction, 0),
JS_PSG("boundThis", DebuggerObject_getBoundThis, 0),
JS_PSG("boundArguments", DebuggerObject_getBoundArguments, 0),
JS_PSG("global", DebuggerObject_getGlobal, 0),
JS_PSG("allocationSite", DebuggerObject_getAllocationSite, 0),
JS_PS_END
};
static const JSFunctionSpec DebuggerObject_methods[] = {
JS_FN("getOwnPropertyDescriptor", DebuggerObject_getOwnPropertyDescriptor, 1, 0),
JS_FN("getOwnPropertyNames", DebuggerObject_getOwnPropertyNames, 0, 0),
JS_FN("getOwnPropertySymbols", DebuggerObject_getOwnPropertySymbols, 0, 0),
JS_FN("defineProperty", DebuggerObject_defineProperty, 2, 0),
JS_FN("defineProperties", DebuggerObject_defineProperties, 1, 0),
JS_FN("deleteProperty", DebuggerObject_deleteProperty, 1, 0),
JS_FN("seal", DebuggerObject_seal, 0, 0),
JS_FN("freeze", DebuggerObject_freeze, 0, 0),
JS_FN("preventExtensions", DebuggerObject_preventExtensions, 0, 0),
JS_FN("isSealed", DebuggerObject_isSealed, 0, 0),
JS_FN("isFrozen", DebuggerObject_isFrozen, 0, 0),
JS_FN("isExtensible", DebuggerObject_isExtensible, 0, 0),
JS_FN("apply", DebuggerObject_apply, 0, 0),
JS_FN("call", DebuggerObject_call, 0, 0),
JS_FN("makeDebuggeeValue", DebuggerObject_makeDebuggeeValue, 1, 0),
JS_FN("executeInGlobal", DebuggerObject_executeInGlobal, 1, 0),
JS_FN("executeInGlobalWithBindings", DebuggerObject_executeInGlobalWithBindings, 2, 0),
JS_FN("asEnvironment", DebuggerObject_asEnvironment, 0, 0),
JS_FN("unwrap", DebuggerObject_unwrap, 0, 0),
JS_FN("unsafeDereference", DebuggerObject_unsafeDereference, 0, 0),
JS_FS_END
};
/*** Debugger.Environment ************************************************************************/
void
DebuggerEnv_trace(JSTracer* trc, JSObject* obj)
{
/*
* There is a barrier on private pointers, so the Unbarriered marking
* is okay.
*/
if (Env* referent = (JSObject*) obj->as<NativeObject>().getPrivate()) {
TraceManuallyBarrieredCrossCompartmentEdge(trc, obj, &referent,
"Debugger.Environment referent");
obj->as<NativeObject>().setPrivateUnbarriered(referent);
}
}
const Class DebuggerEnv_class = {
"Environment",
JSCLASS_HAS_PRIVATE |
JSCLASS_HAS_RESERVED_SLOTS(JSSLOT_DEBUGENV_COUNT),
nullptr, nullptr, nullptr, nullptr,
nullptr, nullptr, nullptr, nullptr,
nullptr, /* call */
nullptr, /* hasInstance */
nullptr, /* construct */
DebuggerEnv_trace
};
static NativeObject*
DebuggerEnv_checkThis(JSContext* cx, const CallArgs& args, const char* fnname,
bool requireDebuggee = true)
{
JSObject* thisobj = NonNullObject(cx, args.thisv());
if (!thisobj)
return nullptr;
if (thisobj->getClass() != &DebuggerEnv_class) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Environment", fnname, thisobj->getClass()->name);
return nullptr;
}
/*
* Forbid Debugger.Environment.prototype, which is of class DebuggerEnv_class
* but isn't a real working Debugger.Environment. The prototype object is
* distinguished by having no referent.
*/
NativeObject* nthisobj = &thisobj->as<NativeObject>();
if (!nthisobj->getPrivate()) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_INCOMPATIBLE_PROTO,
"Debugger.Environment", fnname, "prototype object");
return nullptr;
}
/*
* Forbid access to Debugger.Environment objects that are not debuggee
* environments.
*/
if (requireDebuggee) {
Rooted<Env*> env(cx, static_cast<Env*>(nthisobj->getPrivate()));
if (!Debugger::fromChildJSObject(nthisobj)->observesGlobal(&env->global())) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_NOT_DEBUGGEE,
"Debugger.Environment", "environment");
return nullptr;
}
}
return nthisobj;
}
#define THIS_DEBUGENV(cx, argc, vp, fnname, args, envobj, env) \
CallArgs args = CallArgsFromVp(argc, vp); \
NativeObject* envobj = DebuggerEnv_checkThis(cx, args, fnname); \
if (!envobj) \
return false; \
Rooted<Env*> env(cx, static_cast<Env*>(envobj->getPrivate())); \
MOZ_ASSERT(env); \
MOZ_ASSERT(!IsSyntacticScope(env));
#define THIS_DEBUGENV_OWNER(cx, argc, vp, fnname, args, envobj, env, dbg) \
THIS_DEBUGENV(cx, argc, vp, fnname, args, envobj, env); \
Debugger* dbg = Debugger::fromChildJSObject(envobj)
static bool
DebuggerEnv_construct(JSContext* cx, unsigned argc, Value* vp)
{
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NO_CONSTRUCTOR,
"Debugger.Environment");
return false;
}
static bool
IsDeclarative(Env* env)
{
return env->is<DebugScopeObject>() && env->as<DebugScopeObject>().isForDeclarative();
}
static bool
IsWith(Env* env)
{
return env->is<DebugScopeObject>() &&
env->as<DebugScopeObject>().scope().is<DynamicWithObject>();
}
static bool
DebuggerEnv_getType(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGENV(cx, argc, vp, "get type", args, envobj, env);
/* Don't bother switching compartments just to check env's class. */
const char* s;
if (IsDeclarative(env))
s = "declarative";
else if (IsWith(env))
s = "with";
else
s = "object";
JSAtom* str = Atomize(cx, s, strlen(s), PinAtom);
if (!str)
return false;
args.rval().setString(str);
return true;
}
static bool
DebuggerEnv_getParent(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGENV_OWNER(cx, argc, vp, "get parent", args, envobj, env, dbg);
/* Don't bother switching compartments just to get env's parent. */
Rooted<Env*> parent(cx, env->enclosingScope());
return dbg->wrapEnvironment(cx, parent, args.rval());
}
static bool
DebuggerEnv_getObject(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGENV_OWNER(cx, argc, vp, "get type", args, envobj, env, dbg);
/*
* Don't bother switching compartments just to check env's class and
* possibly get its proto.
*/
if (IsDeclarative(env)) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_NO_SCOPE_OBJECT);
return false;
}
JSObject* obj;
if (IsWith(env)) {
obj = &env->as<DebugScopeObject>().scope().as<DynamicWithObject>().object();
} else {
obj = env;
MOZ_ASSERT(!obj->is<DebugScopeObject>());
}
args.rval().setObject(*obj);
if (!dbg->wrapDebuggeeValue(cx, args.rval()))
return false;
return true;
}
static bool
DebuggerEnv_getCallee(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGENV_OWNER(cx, argc, vp, "get callee", args, envobj, env, dbg);
args.rval().setNull();
if (!env->is<DebugScopeObject>())
return true;
JSObject& scope = env->as<DebugScopeObject>().scope();
if (!scope.is<CallObject>())
return true;
CallObject& callobj = scope.as<CallObject>();
if (callobj.isForEval())
return true;
JSFunction& callee = callobj.callee();
if (IsInternalFunctionObject(callee))
return true;
args.rval().setObject(callee);
if (!dbg->wrapDebuggeeValue(cx, args.rval()))
return false;
return true;
}
static bool
DebuggerEnv_getInspectable(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
NativeObject* envobj = DebuggerEnv_checkThis(cx, args, "get inspectable", false);
if (!envobj)
return false;
Rooted<Env*> env(cx, static_cast<Env*>(envobj->getPrivate()));
MOZ_ASSERT(env);
MOZ_ASSERT(!env->is<ScopeObject>());
Debugger* dbg = Debugger::fromChildJSObject(envobj);
args.rval().setBoolean(dbg->observesGlobal(&env->global()));
return true;
}
static bool
DebuggerEnv_getOptimizedOut(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
NativeObject* envobj = DebuggerEnv_checkThis(cx, args, "get optimizedOut", false);
if (!envobj)
return false;
Rooted<Env*> env(cx, static_cast<Env*>(envobj->getPrivate()));
MOZ_ASSERT(env);
MOZ_ASSERT(!env->is<ScopeObject>());
args.rval().setBoolean(env->is<DebugScopeObject>() &&
env->as<DebugScopeObject>().isOptimizedOut());
return true;
}
static bool
DebuggerEnv_names(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGENV(cx, argc, vp, "names", args, envobj, env);
AutoIdVector keys(cx);
{
Maybe<AutoCompartment> ac;
ac.emplace(cx, env);
ErrorCopier ec(ac);
if (!GetPropertyKeys(cx, env, JSITER_HIDDEN, &keys))
return false;
}
RootedObject arr(cx, NewDenseEmptyArray(cx));
if (!arr)
return false;
RootedId id(cx);
for (size_t i = 0, len = keys.length(); i < len; i++) {
id = keys[i];
if (JSID_IS_ATOM(id) && IsIdentifier(JSID_TO_ATOM(id))) {
if (!NewbornArrayPush(cx, arr, StringValue(JSID_TO_STRING(id))))
return false;
}
}
args.rval().setObject(*arr);
return true;
}
static bool
DebuggerEnv_find(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGENV_OWNER(cx, argc, vp, "find", args, envobj, env, dbg);
if (!args.requireAtLeast(cx, "Debugger.Environment.find", 1))
return false;
RootedId id(cx);
if (!ValueToIdentifier(cx, args[0], &id))
return false;
{
Maybe<AutoCompartment> ac;
ac.emplace(cx, env);
/* This can trigger resolve hooks. */
ErrorCopier ec(ac);
bool found;
for (; env; env = env->enclosingScope()) {
if (!HasProperty(cx, env, id, &found))
return false;
if (found)
break;
}
}
return dbg->wrapEnvironment(cx, env, args.rval());
}
static bool
DebuggerEnv_getVariable(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGENV_OWNER(cx, argc, vp, "getVariable", args, envobj, env, dbg);
if (!args.requireAtLeast(cx, "Debugger.Environment.getVariable", 1))
return false;
RootedId id(cx);
if (!ValueToIdentifier(cx, args[0], &id))
return false;
RootedValue v(cx);
{
Maybe<AutoCompartment> ac;
ac.emplace(cx, env);
/* This can trigger getters. */
ErrorCopier ec(ac);
// For DebugScopeObjects, we get sentinel values for optimized out
// slots and arguments instead of throwing (the default behavior).
//
// See wrapDebuggeeValue for how the sentinel values are wrapped.
if (env->is<DebugScopeObject>()) {
if (!env->as<DebugScopeObject>().getMaybeSentinelValue(cx, id, &v))
return false;
} else {
if (!GetProperty(cx, env, env, id, &v))
return false;
}
}
// When we've faked up scope chain objects for optimized-out scopes,
// declarative environments may contain internal JSFunction objects, which
// we shouldn't expose to the user.
if (v.isObject()) {
RootedObject obj(cx, &v.toObject());
if (obj->is<JSFunction>() &&
IsInternalFunctionObject(obj->as<JSFunction>()))
v.setMagic(JS_OPTIMIZED_OUT);
}
if (!dbg->wrapDebuggeeValue(cx, &v))
return false;
args.rval().set(v);
return true;
}
static bool
DebuggerEnv_setVariable(JSContext* cx, unsigned argc, Value* vp)
{
THIS_DEBUGENV_OWNER(cx, argc, vp, "setVariable", args, envobj, env, dbg);
if (!args.requireAtLeast(cx, "Debugger.Environment.setVariable", 2))
return false;
RootedId id(cx);
if (!ValueToIdentifier(cx, args[0], &id))
return false;
RootedValue v(cx, args[1]);
if (!dbg->unwrapDebuggeeValue(cx, &v))
return false;
{
Maybe<AutoCompartment> ac;
ac.emplace(cx, env);
if (!cx->compartment()->wrap(cx, &v))
return false;
/* This can trigger setters. */
ErrorCopier ec(ac);
/* Make sure the environment actually has the specified binding. */
bool has;
if (!HasProperty(cx, env, id, &has))
return false;
if (!has) {
JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_DEBUG_VARIABLE_NOT_FOUND);
return false;
}
/* Just set the property. */
if (!SetProperty(cx, env, id, v))
return false;
}
args.rval().setUndefined();
return true;
}
static const JSPropertySpec DebuggerEnv_properties[] = {
JS_PSG("type", DebuggerEnv_getType, 0),
JS_PSG("object", DebuggerEnv_getObject, 0),
JS_PSG("parent", DebuggerEnv_getParent, 0),
JS_PSG("callee", DebuggerEnv_getCallee, 0),
JS_PSG("inspectable", DebuggerEnv_getInspectable, 0),
JS_PSG("optimizedOut", DebuggerEnv_getOptimizedOut, 0),
JS_PS_END
};
static const JSFunctionSpec DebuggerEnv_methods[] = {
JS_FN("names", DebuggerEnv_names, 0, 0),
JS_FN("find", DebuggerEnv_find, 1, 0),
JS_FN("getVariable", DebuggerEnv_getVariable, 1, 0),
JS_FN("setVariable", DebuggerEnv_setVariable, 2, 0),
JS_FS_END
};
/*** JS::dbg::Builder ****************************************************************************/
Builder::Builder(JSContext* cx, js::Debugger* debugger)
: debuggerObject(cx, debugger->toJSObject().get()),
debugger(debugger)
{ }
#if DEBUG
void
Builder::assertBuilt(JSObject* obj)
{
// We can't use assertSameCompartment here, because that is always keyed to
// some JSContext's current compartment, whereas BuiltThings can be
// constructed and assigned to without respect to any particular context;
// the only constraint is that they should be in their debugger's compartment.
MOZ_ASSERT_IF(obj, debuggerObject->compartment() == obj->compartment());
}
#endif
bool
Builder::Object::definePropertyToTrusted(JSContext* cx, const char* name,
JS::MutableHandleValue trusted)
{
// We should have checked for false Objects before calling this.
MOZ_ASSERT(value);
JSAtom* atom = Atomize(cx, name, strlen(name));
if (!atom)
return false;
RootedId id(cx, AtomToId(atom));
return DefineProperty(cx, value, id, trusted);
}
bool
Builder::Object::defineProperty(JSContext* cx, const char* name, JS::HandleValue propval_)
{
AutoCompartment ac(cx, debuggerObject());
RootedValue propval(cx, propval_);
if (!debugger()->wrapDebuggeeValue(cx, &propval))
return false;
return definePropertyToTrusted(cx, name, &propval);
}
bool
Builder::Object::defineProperty(JSContext* cx, const char* name, JS::HandleObject propval_)
{
RootedValue propval(cx, ObjectOrNullValue(propval_));
return defineProperty(cx, name, propval);
}
bool
Builder::Object::defineProperty(JSContext* cx, const char* name, Builder::Object& propval_)
{
AutoCompartment ac(cx, debuggerObject());
RootedValue propval(cx, ObjectOrNullValue(propval_.value));
return definePropertyToTrusted(cx, name, &propval);
}
Builder::Object
Builder::newObject(JSContext* cx)
{
AutoCompartment ac(cx, debuggerObject);
RootedPlainObject obj(cx, NewBuiltinClassInstance<PlainObject>(cx));
// If the allocation failed, this will return a false Object, as the spec promises.
return Object(cx, *this, obj);
}
/*** JS::dbg::AutoEntryMonitor ******************************************************************/
AutoEntryMonitor::AutoEntryMonitor(JSContext* cx)
: runtime_(cx->runtime()),
savedMonitor_(cx->runtime()->entryMonitor)
{
runtime_->entryMonitor = this;
}
AutoEntryMonitor::~AutoEntryMonitor()
{
runtime_->entryMonitor = savedMonitor_;
}
/*** Glue ****************************************************************************************/
extern JS_PUBLIC_API(bool)
JS_DefineDebuggerObject(JSContext* cx, HandleObject obj)
{
RootedNativeObject
objProto(cx),
debugCtor(cx),
debugProto(cx),
frameProto(cx),
scriptProto(cx),
sourceProto(cx),
objectProto(cx),
envProto(cx),
memoryProto(cx);
objProto = obj->as<GlobalObject>().getOrCreateObjectPrototype(cx);
if (!objProto)
return false;
debugProto = InitClass(cx, obj,
objProto, &Debugger::jsclass, Debugger::construct,
1, Debugger::properties, Debugger::methods, nullptr, nullptr,
debugCtor.address());
if (!debugProto)
return false;
frameProto = InitClass(cx, debugCtor, objProto, &DebuggerFrame_class,
DebuggerFrame_construct, 0,
DebuggerFrame_properties, DebuggerFrame_methods,
nullptr, nullptr);
if (!frameProto)
return false;
scriptProto = InitClass(cx, debugCtor, objProto, &DebuggerScript_class,
DebuggerScript_construct, 0,
DebuggerScript_properties, DebuggerScript_methods,
nullptr, nullptr);
if (!scriptProto)
return false;
sourceProto = InitClass(cx, debugCtor, sourceProto, &DebuggerSource_class,
DebuggerSource_construct, 0,
DebuggerSource_properties, DebuggerSource_methods,
nullptr, nullptr);
if (!sourceProto)
return false;
objectProto = InitClass(cx, debugCtor, objProto, &DebuggerObject_class,
DebuggerObject_construct, 0,
DebuggerObject_properties, DebuggerObject_methods,
nullptr, nullptr);
if (!objectProto)
return false;
envProto = InitClass(cx, debugCtor, objProto, &DebuggerEnv_class,
DebuggerEnv_construct, 0,
DebuggerEnv_properties, DebuggerEnv_methods,
nullptr, nullptr);
if (!envProto)
return false;
memoryProto = InitClass(cx, debugCtor, objProto, &DebuggerMemory::class_,
DebuggerMemory::construct, 0, DebuggerMemory::properties,
DebuggerMemory::methods, nullptr, nullptr);
if (!memoryProto)
return false;
debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_FRAME_PROTO, ObjectValue(*frameProto));
debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_OBJECT_PROTO, ObjectValue(*objectProto));
debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_SCRIPT_PROTO, ObjectValue(*scriptProto));
debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_SOURCE_PROTO, ObjectValue(*sourceProto));
debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_ENV_PROTO, ObjectValue(*envProto));
debugProto->setReservedSlot(Debugger::JSSLOT_DEBUG_MEMORY_PROTO, ObjectValue(*memoryProto));
return true;
}
static inline void
AssertIsPromise(JSContext* cx, HandleObject promise)
{
MOZ_ASSERT(promise);
assertSameCompartment(cx, promise);
MOZ_ASSERT(strcmp(promise->getClass()->name, "Promise") == 0 ||
strcmp(promise->getClass()->name, "MozAbortablePromise") == 0);
}
JS_PUBLIC_API(void)
JS::dbg::onNewPromise(JSContext* cx, HandleObject promise)
{
AssertIsPromise(cx, promise);
Debugger::slowPathPromiseHook(cx, Debugger::OnNewPromise, promise);
}
JS_PUBLIC_API(void)
JS::dbg::onPromiseSettled(JSContext* cx, HandleObject promise)
{
AssertIsPromise(cx, promise);
Debugger::slowPathPromiseHook(cx, Debugger::OnPromiseSettled, promise);
}
JS_PUBLIC_API(bool)
JS::dbg::IsDebugger(JSObject& obj)
{
JSObject* unwrapped = CheckedUnwrap(&obj);
return unwrapped &&
js::GetObjectClass(unwrapped) == &Debugger::jsclass &&
js::Debugger::fromJSObject(unwrapped) != nullptr;
}
JS_PUBLIC_API(bool)
JS::dbg::GetDebuggeeGlobals(JSContext* cx, JSObject& dbgObj, AutoObjectVector& vector)
{
MOZ_ASSERT(IsDebugger(dbgObj));
js::Debugger* dbg = js::Debugger::fromJSObject(CheckedUnwrap(&dbgObj));
if (!vector.reserve(vector.length() + dbg->debuggees.count())) {
JS_ReportOutOfMemory(cx);
return false;
}
for (WeakGlobalObjectSet::Range r = dbg->allDebuggees(); !r.empty(); r.popFront())
vector.infallibleAppend(static_cast<JSObject*>(r.front()));
return true;
}
/*** JS::dbg::GarbageCollectionEvent **************************************************************/
namespace JS {
namespace dbg {
/* static */ GarbageCollectionEvent::Ptr
GarbageCollectionEvent::Create(JSRuntime* rt, ::js::gcstats::Statistics& stats, uint64_t gcNumber)
{
auto data = rt->make_unique<GarbageCollectionEvent>(gcNumber);
if (!data)
return nullptr;
data->nonincrementalReason = stats.nonincrementalReason();
for (auto range = stats.sliceRange(); !range.empty(); range.popFront()) {
if (!data->reason) {
// There is only one GC reason for the whole cycle, but for legacy
// reasons this data is stored and replicated on each slice. Each
// slice used to have its own GCReason, but now they are all the
// same.
data->reason = gcstats::ExplainReason(range.front().reason);
MOZ_ASSERT(data->reason);
}
if (!data->collections.growBy(1))
return nullptr;
data->collections.back().startTimestamp = range.front().startTimestamp;
data->collections.back().endTimestamp = range.front().endTimestamp;
}
return data;
}
static bool
DefineStringProperty(JSContext* cx, HandleObject obj, PropertyName* propName, const char* strVal)
{
RootedValue val(cx, UndefinedValue());
if (strVal) {
JSAtom* atomized = Atomize(cx, strVal, strlen(strVal));
if (!atomized)
return false;
val = StringValue(atomized);
}
return DefineProperty(cx, obj, propName, val);
}
JSObject*
GarbageCollectionEvent::toJSObject(JSContext* cx) const
{
RootedObject obj(cx, NewBuiltinClassInstance<PlainObject>(cx));
RootedValue gcCycleNumberVal(cx, NumberValue(majorGCNumber_));
if (!obj ||
!DefineStringProperty(cx, obj, cx->names().nonincrementalReason, nonincrementalReason) ||
!DefineStringProperty(cx, obj, cx->names().reason, reason) ||
!DefineProperty(cx, obj, cx->names().gcCycleNumber, gcCycleNumberVal))
{
return nullptr;
}
RootedArrayObject slicesArray(cx, NewDenseEmptyArray(cx));
if (!slicesArray)
return nullptr;
size_t idx = 0;
for (auto range = collections.all(); !range.empty(); range.popFront()) {
RootedPlainObject collectionObj(cx, NewBuiltinClassInstance<PlainObject>(cx));
if (!collectionObj)
return nullptr;
RootedValue start(cx, NumberValue(range.front().startTimestamp));
RootedValue end(cx, NumberValue(range.front().endTimestamp));
if (!DefineProperty(cx, collectionObj, cx->names().startTimestamp, start) ||
!DefineProperty(cx, collectionObj, cx->names().endTimestamp, end))
{
return nullptr;
}
RootedValue collectionVal(cx, ObjectValue(*collectionObj));
if (!DefineElement(cx, slicesArray, idx++, collectionVal))
return nullptr;
}
RootedValue slicesValue(cx, ObjectValue(*slicesArray));
if (!DefineProperty(cx, obj, cx->names().collections, slicesValue))
return nullptr;
return obj;
}
JS_PUBLIC_API(bool)
FireOnGarbageCollectionHook(JSContext* cx, JS::dbg::GarbageCollectionEvent::Ptr&& data)
{
AutoObjectVector triggered(cx);
{
// We had better not GC (and potentially get a dangling Debugger
// pointer) while finding all Debuggers observing a debuggee that
// participated in this GC.
AutoCheckCannotGC noGC;
for (Debugger* dbg : cx->runtime()->debuggerList) {
if (dbg->enabled &&
dbg->observedGC(data->majorGCNumber()) &&
dbg->getHook(Debugger::OnGarbageCollection))
{
if (!triggered.append(dbg->object)) {
JS_ReportOutOfMemory(cx);
return false;
}
}
}
}
for ( ; !triggered.empty(); triggered.popBack()) {
Debugger* dbg = Debugger::fromJSObject(triggered.back());
dbg->fireOnGarbageCollectionHook(cx, data);
MOZ_ASSERT(!cx->isExceptionPending());
}
return true;
}
} // namespace dbg
} // namespace JS