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cobalt / cobalt / c73ce7d5dfce7ae20bcc30efc5f220e0fbac12b1 / . / src / third_party / mozjs-45 / js / src / jit / SharedIC.cpp
blob: 2867776f0aff51d7a902f3efdb6d5e712f926da6 [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 "jit/SharedIC.h"
#include "mozilla/Casting.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/SizePrintfMacros.h"
#include "jslibmath.h"
#include "jstypes.h"
#include "jit/BaselineDebugModeOSR.h"
#include "jit/BaselineIC.h"
#include "jit/JitSpewer.h"
#include "jit/Linker.h"
#include "jit/SharedICHelpers.h"
#ifdef JS_ION_PERF
# include "jit/PerfSpewer.h"
#endif
#include "jit/VMFunctions.h"
#include "vm/Interpreter.h"
#include "jit/MacroAssembler-inl.h"
#include "vm/Interpreter-inl.h"
using mozilla::BitwiseCast;
using mozilla::DebugOnly;
namespace js {
namespace jit {
#ifdef JS_JITSPEW
void
FallbackICSpew(JSContext* cx, ICFallbackStub* stub, const char* fmt, ...)
{
if (JitSpewEnabled(JitSpew_BaselineICFallback)) {
RootedScript script(cx, GetTopJitJSScript(cx));
jsbytecode* pc = stub->icEntry()->pc(script);
char fmtbuf[100];
va_list args;
va_start(args, fmt);
vsnprintf(fmtbuf, 100, fmt, args);
va_end(args);
JitSpew(JitSpew_BaselineICFallback,
"Fallback hit for (%s:%" PRIuSIZE ") (pc=%" PRIuSIZE ",line=%d,uses=%d,stubs=%" PRIuSIZE "): %s",
script->filename(),
script->lineno(),
script->pcToOffset(pc),
PCToLineNumber(script, pc),
script->getWarmUpCount(),
stub->numOptimizedStubs(),
fmtbuf);
}
}
void
TypeFallbackICSpew(JSContext* cx, ICTypeMonitor_Fallback* stub, const char* fmt, ...)
{
if (JitSpewEnabled(JitSpew_BaselineICFallback)) {
RootedScript script(cx, GetTopJitJSScript(cx));
jsbytecode* pc = stub->icEntry()->pc(script);
char fmtbuf[100];
va_list args;
va_start(args, fmt);
vsnprintf(fmtbuf, 100, fmt, args);
va_end(args);
JitSpew(JitSpew_BaselineICFallback,
"Type monitor fallback hit for (%s:%" PRIuSIZE ") (pc=%" PRIuSIZE ",line=%d,uses=%d,stubs=%d): %s",
script->filename(),
script->lineno(),
script->pcToOffset(pc),
PCToLineNumber(script, pc),
script->getWarmUpCount(),
(int) stub->numOptimizedMonitorStubs(),
fmtbuf);
}
}
#endif // JS_JITSPEW
ICFallbackStub*
ICEntry::fallbackStub() const
{
return firstStub()->getChainFallback();
}
void
ICEntry::trace(JSTracer* trc)
{
if (!hasStub())
return;
for (ICStub* stub = firstStub(); stub; stub = stub->next())
stub->trace(trc);
}
ICStubConstIterator&
ICStubConstIterator::operator++()
{
MOZ_ASSERT(currentStub_ != nullptr);
currentStub_ = currentStub_->next();
return *this;
}
ICStubIterator::ICStubIterator(ICFallbackStub* fallbackStub, bool end)
: icEntry_(fallbackStub->icEntry()),
fallbackStub_(fallbackStub),
previousStub_(nullptr),
currentStub_(end ? fallbackStub : icEntry_->firstStub()),
unlinked_(false)
{ }
ICStubIterator&
ICStubIterator::operator++()
{
MOZ_ASSERT(currentStub_->next() != nullptr);
if (!unlinked_)
previousStub_ = currentStub_;
currentStub_ = currentStub_->next();
unlinked_ = false;
return *this;
}
void
ICStubIterator::unlink(JSContext* cx)
{
MOZ_ASSERT(currentStub_->next() != nullptr);
MOZ_ASSERT(currentStub_ != fallbackStub_);
MOZ_ASSERT(!unlinked_);
fallbackStub_->unlinkStub(cx->zone(), previousStub_, currentStub_);
// Mark the current iterator position as unlinked, so operator++ works properly.
unlinked_ = true;
}
void
ICStub::markCode(JSTracer* trc, const char* name)
{
JitCode* stubJitCode = jitCode();
TraceManuallyBarrieredEdge(trc, &stubJitCode, name);
}
void
ICStub::updateCode(JitCode* code)
{
// Write barrier on the old code.
JitCode::writeBarrierPre(jitCode());
stubCode_ = code->raw();
}
/* static */ void
ICStub::trace(JSTracer* trc)
{
markCode(trc, "shared-stub-jitcode");
// If the stub is a monitored fallback stub, then mark the monitor ICs hanging
// off of that stub. We don't need to worry about the regular monitored stubs,
// because the regular monitored stubs will always have a monitored fallback stub
// that references the same stub chain.
if (isMonitoredFallback()) {
ICTypeMonitor_Fallback* lastMonStub = toMonitoredFallbackStub()->fallbackMonitorStub();
for (ICStubConstIterator iter(lastMonStub->firstMonitorStub()); !iter.atEnd(); iter++) {
MOZ_ASSERT_IF(iter->next() == nullptr, *iter == lastMonStub);
iter->trace(trc);
}
}
if (isUpdated()) {
for (ICStubConstIterator iter(toUpdatedStub()->firstUpdateStub()); !iter.atEnd(); iter++) {
MOZ_ASSERT_IF(iter->next() == nullptr, iter->isTypeUpdate_Fallback());
iter->trace(trc);
}
}
switch (kind()) {
case ICStub::Call_Scripted: {
ICCall_Scripted* callStub = toCall_Scripted();
TraceEdge(trc, &callStub->callee(), "baseline-callscripted-callee");
if (callStub->templateObject())
TraceEdge(trc, &callStub->templateObject(), "baseline-callscripted-template");
break;
}
case ICStub::Call_Native: {
ICCall_Native* callStub = toCall_Native();
TraceEdge(trc, &callStub->callee(), "baseline-callnative-callee");
if (callStub->templateObject())
TraceEdge(trc, &callStub->templateObject(), "baseline-callnative-template");
break;
}
case ICStub::Call_ClassHook: {
ICCall_ClassHook* callStub = toCall_ClassHook();
if (callStub->templateObject())
TraceEdge(trc, &callStub->templateObject(), "baseline-callclasshook-template");
break;
}
case ICStub::Call_StringSplit: {
ICCall_StringSplit* callStub = toCall_StringSplit();
TraceEdge(trc, &callStub->templateObject(), "baseline-callstringsplit-template");
TraceEdge(trc, &callStub->expectedArg(), "baseline-callstringsplit-arg");
TraceEdge(trc, &callStub->expectedThis(), "baseline-callstringsplit-this");
break;
}
case ICStub::GetElem_NativeSlotName:
case ICStub::GetElem_NativeSlotSymbol:
case ICStub::GetElem_UnboxedPropertyName: {
ICGetElemNativeStub* getElemStub = static_cast<ICGetElemNativeStub*>(this);
getElemStub->receiverGuard().trace(trc);
if (getElemStub->isSymbol()) {
ICGetElem_NativeSlot<JS::Symbol*>* typedGetElemStub = toGetElem_NativeSlotSymbol();
TraceEdge(trc, &typedGetElemStub->key(), "baseline-getelem-native-key");
} else {
ICGetElemNativeSlotStub<PropertyName*>* typedGetElemStub =
reinterpret_cast<ICGetElemNativeSlotStub<PropertyName*>*>(this);
TraceEdge(trc, &typedGetElemStub->key(), "baseline-getelem-native-key");
}
break;
}
case ICStub::GetElem_NativePrototypeSlotName:
case ICStub::GetElem_NativePrototypeSlotSymbol: {
ICGetElemNativeStub* getElemStub = static_cast<ICGetElemNativeStub*>(this);
getElemStub->receiverGuard().trace(trc);
if (getElemStub->isSymbol()) {
ICGetElem_NativePrototypeSlot<JS::Symbol*>* typedGetElemStub
= toGetElem_NativePrototypeSlotSymbol();
TraceEdge(trc, &typedGetElemStub->key(), "baseline-getelem-nativeproto-key");
TraceEdge(trc, &typedGetElemStub->holder(), "baseline-getelem-nativeproto-holder");
TraceEdge(trc, &typedGetElemStub->holderShape(), "baseline-getelem-nativeproto-holdershape");
} else {
ICGetElem_NativePrototypeSlot<PropertyName*>* typedGetElemStub
= toGetElem_NativePrototypeSlotName();
TraceEdge(trc, &typedGetElemStub->key(), "baseline-getelem-nativeproto-key");
TraceEdge(trc, &typedGetElemStub->holder(), "baseline-getelem-nativeproto-holder");
TraceEdge(trc, &typedGetElemStub->holderShape(), "baseline-getelem-nativeproto-holdershape");
}
break;
}
case ICStub::GetElem_NativePrototypeCallNativeName:
case ICStub::GetElem_NativePrototypeCallNativeSymbol:
case ICStub::GetElem_NativePrototypeCallScriptedName:
case ICStub::GetElem_NativePrototypeCallScriptedSymbol: {
ICGetElemNativeStub* getElemStub = static_cast<ICGetElemNativeStub*>(this);
getElemStub->receiverGuard().trace(trc);
if (getElemStub->isSymbol()) {
ICGetElemNativePrototypeCallStub<JS::Symbol*>* callStub =
reinterpret_cast<ICGetElemNativePrototypeCallStub<JS::Symbol*>*>(this);
TraceEdge(trc, &callStub->key(), "baseline-getelem-nativeprotocall-key");
TraceEdge(trc, &callStub->getter(), "baseline-getelem-nativeprotocall-getter");
TraceEdge(trc, &callStub->holder(), "baseline-getelem-nativeprotocall-holder");
TraceEdge(trc, &callStub->holderShape(), "baseline-getelem-nativeprotocall-holdershape");
} else {
ICGetElemNativePrototypeCallStub<PropertyName*>* callStub =
reinterpret_cast<ICGetElemNativePrototypeCallStub<PropertyName*>*>(this);
TraceEdge(trc, &callStub->key(), "baseline-getelem-nativeprotocall-key");
TraceEdge(trc, &callStub->getter(), "baseline-getelem-nativeprotocall-getter");
TraceEdge(trc, &callStub->holder(), "baseline-getelem-nativeprotocall-holder");
TraceEdge(trc, &callStub->holderShape(), "baseline-getelem-nativeprotocall-holdershape");
}
break;
}
case ICStub::GetElem_Dense: {
ICGetElem_Dense* getElemStub = toGetElem_Dense();
TraceEdge(trc, &getElemStub->shape(), "baseline-getelem-dense-shape");
break;
}
case ICStub::GetElem_UnboxedArray: {
ICGetElem_UnboxedArray* getElemStub = toGetElem_UnboxedArray();
TraceEdge(trc, &getElemStub->group(), "baseline-getelem-unboxed-array-group");
break;
}
case ICStub::GetElem_TypedArray: {
ICGetElem_TypedArray* getElemStub = toGetElem_TypedArray();
TraceEdge(trc, &getElemStub->shape(), "baseline-getelem-typedarray-shape");
break;
}
case ICStub::SetElem_DenseOrUnboxedArray: {
ICSetElem_DenseOrUnboxedArray* setElemStub = toSetElem_DenseOrUnboxedArray();
if (setElemStub->shape())
TraceEdge(trc, &setElemStub->shape(), "baseline-getelem-dense-shape");
TraceEdge(trc, &setElemStub->group(), "baseline-setelem-dense-group");
break;
}
case ICStub::SetElem_DenseOrUnboxedArrayAdd: {
ICSetElem_DenseOrUnboxedArrayAdd* setElemStub = toSetElem_DenseOrUnboxedArrayAdd();
TraceEdge(trc, &setElemStub->group(), "baseline-setelem-denseadd-group");
JS_STATIC_ASSERT(ICSetElem_DenseOrUnboxedArrayAdd::MAX_PROTO_CHAIN_DEPTH == 4);
switch (setElemStub->protoChainDepth()) {
case 0: setElemStub->toImpl<0>()->traceShapes(trc); break;
case 1: setElemStub->toImpl<1>()->traceShapes(trc); break;
case 2: setElemStub->toImpl<2>()->traceShapes(trc); break;
case 3: setElemStub->toImpl<3>()->traceShapes(trc); break;
case 4: setElemStub->toImpl<4>()->traceShapes(trc); break;
default: MOZ_CRASH("Invalid proto stub.");
}
break;
}
case ICStub::SetElem_TypedArray: {
ICSetElem_TypedArray* setElemStub = toSetElem_TypedArray();
TraceEdge(trc, &setElemStub->shape(), "baseline-setelem-typedarray-shape");
break;
}
case ICStub::TypeMonitor_SingleObject: {
ICTypeMonitor_SingleObject* monitorStub = toTypeMonitor_SingleObject();
TraceEdge(trc, &monitorStub->object(), "baseline-monitor-singleton");
break;
}
case ICStub::TypeMonitor_ObjectGroup: {
ICTypeMonitor_ObjectGroup* monitorStub = toTypeMonitor_ObjectGroup();
TraceEdge(trc, &monitorStub->group(), "baseline-monitor-group");
break;
}
case ICStub::TypeUpdate_SingleObject: {
ICTypeUpdate_SingleObject* updateStub = toTypeUpdate_SingleObject();
TraceEdge(trc, &updateStub->object(), "baseline-update-singleton");
break;
}
case ICStub::TypeUpdate_ObjectGroup: {
ICTypeUpdate_ObjectGroup* updateStub = toTypeUpdate_ObjectGroup();
TraceEdge(trc, &updateStub->group(), "baseline-update-group");
break;
}
case ICStub::In_Native: {
ICIn_Native* inStub = toIn_Native();
TraceEdge(trc, &inStub->shape(), "baseline-innative-stub-shape");
TraceEdge(trc, &inStub->name(), "baseline-innative-stub-name");
break;
}
case ICStub::In_NativePrototype: {
ICIn_NativePrototype* inStub = toIn_NativePrototype();
TraceEdge(trc, &inStub->shape(), "baseline-innativeproto-stub-shape");
TraceEdge(trc, &inStub->name(), "baseline-innativeproto-stub-name");
TraceEdge(trc, &inStub->holder(), "baseline-innativeproto-stub-holder");
TraceEdge(trc, &inStub->holderShape(), "baseline-innativeproto-stub-holdershape");
break;
}
case ICStub::In_NativeDoesNotExist: {
ICIn_NativeDoesNotExist* inStub = toIn_NativeDoesNotExist();
TraceEdge(trc, &inStub->name(), "baseline-innativedoesnotexist-stub-name");
JS_STATIC_ASSERT(ICIn_NativeDoesNotExist::MAX_PROTO_CHAIN_DEPTH == 8);
switch (inStub->protoChainDepth()) {
case 0: inStub->toImpl<0>()->traceShapes(trc); break;
case 1: inStub->toImpl<1>()->traceShapes(trc); break;
case 2: inStub->toImpl<2>()->traceShapes(trc); break;
case 3: inStub->toImpl<3>()->traceShapes(trc); break;
case 4: inStub->toImpl<4>()->traceShapes(trc); break;
case 5: inStub->toImpl<5>()->traceShapes(trc); break;
case 6: inStub->toImpl<6>()->traceShapes(trc); break;
case 7: inStub->toImpl<7>()->traceShapes(trc); break;
case 8: inStub->toImpl<8>()->traceShapes(trc); break;
default: MOZ_CRASH("Invalid proto stub.");
}
break;
}
case ICStub::In_Dense: {
ICIn_Dense* inStub = toIn_Dense();
TraceEdge(trc, &inStub->shape(), "baseline-in-dense-shape");
break;
}
case ICStub::GetName_Global: {
ICGetName_Global* globalStub = toGetName_Global();
globalStub->receiverGuard().trace(trc);
TraceEdge(trc, &globalStub->holder(), "baseline-global-stub-holder");
TraceEdge(trc, &globalStub->holderShape(), "baseline-global-stub-holdershape");
TraceEdge(trc, &globalStub->globalShape(), "baseline-global-stub-globalshape");
break;
}
case ICStub::GetName_Scope0:
static_cast<ICGetName_Scope<0>*>(this)->traceScopes(trc);
break;
case ICStub::GetName_Scope1:
static_cast<ICGetName_Scope<1>*>(this)->traceScopes(trc);
break;
case ICStub::GetName_Scope2:
static_cast<ICGetName_Scope<2>*>(this)->traceScopes(trc);
break;
case ICStub::GetName_Scope3:
static_cast<ICGetName_Scope<3>*>(this)->traceScopes(trc);
break;
case ICStub::GetName_Scope4:
static_cast<ICGetName_Scope<4>*>(this)->traceScopes(trc);
break;
case ICStub::GetName_Scope5:
static_cast<ICGetName_Scope<5>*>(this)->traceScopes(trc);
break;
case ICStub::GetName_Scope6:
static_cast<ICGetName_Scope<6>*>(this)->traceScopes(trc);
break;
case ICStub::GetIntrinsic_Constant: {
ICGetIntrinsic_Constant* constantStub = toGetIntrinsic_Constant();
TraceEdge(trc, &constantStub->value(), "baseline-getintrinsic-constant-value");
break;
}
case ICStub::GetProp_Primitive: {
ICGetProp_Primitive* propStub = toGetProp_Primitive();
TraceEdge(trc, &propStub->protoShape(), "baseline-getprop-primitive-stub-shape");
break;
}
case ICStub::GetProp_Native: {
ICGetProp_Native* propStub = toGetProp_Native();
propStub->receiverGuard().trace(trc);
break;
}
case ICStub::GetProp_NativePrototype: {
ICGetProp_NativePrototype* propStub = toGetProp_NativePrototype();
propStub->receiverGuard().trace(trc);
TraceEdge(trc, &propStub->holder(), "baseline-getpropnativeproto-stub-holder");
TraceEdge(trc, &propStub->holderShape(), "baseline-getpropnativeproto-stub-holdershape");
break;
}
case ICStub::GetProp_NativeDoesNotExist: {
ICGetProp_NativeDoesNotExist* propStub = toGetProp_NativeDoesNotExist();
propStub->guard().trace(trc);
JS_STATIC_ASSERT(ICGetProp_NativeDoesNotExist::MAX_PROTO_CHAIN_DEPTH == 8);
switch (propStub->protoChainDepth()) {
case 0: propStub->toImpl<0>()->traceShapes(trc); break;
case 1: propStub->toImpl<1>()->traceShapes(trc); break;
case 2: propStub->toImpl<2>()->traceShapes(trc); break;
case 3: propStub->toImpl<3>()->traceShapes(trc); break;
case 4: propStub->toImpl<4>()->traceShapes(trc); break;
case 5: propStub->toImpl<5>()->traceShapes(trc); break;
case 6: propStub->toImpl<6>()->traceShapes(trc); break;
case 7: propStub->toImpl<7>()->traceShapes(trc); break;
case 8: propStub->toImpl<8>()->traceShapes(trc); break;
default: MOZ_CRASH("Invalid proto stub.");
}
break;
}
case ICStub::GetProp_Unboxed: {
ICGetProp_Unboxed* propStub = toGetProp_Unboxed();
TraceEdge(trc, &propStub->group(), "baseline-getprop-unboxed-stub-group");
break;
}
case ICStub::GetProp_TypedObject: {
ICGetProp_TypedObject* propStub = toGetProp_TypedObject();
TraceEdge(trc, &propStub->shape(), "baseline-getprop-typedobject-stub-shape");
break;
}
case ICStub::GetProp_CallDOMProxyNative:
case ICStub::GetProp_CallDOMProxyWithGenerationNative: {
ICGetPropCallDOMProxyNativeStub* propStub;
if (kind() == ICStub::GetProp_CallDOMProxyNative)
propStub = toGetProp_CallDOMProxyNative();
else
propStub = toGetProp_CallDOMProxyWithGenerationNative();
propStub->receiverGuard().trace(trc);
if (propStub->expandoShape()) {
TraceEdge(trc, &propStub->expandoShape(),
"baseline-getproplistbasenative-stub-expandoshape");
}
TraceEdge(trc, &propStub->holder(), "baseline-getproplistbasenative-stub-holder");
TraceEdge(trc, &propStub->holderShape(), "baseline-getproplistbasenative-stub-holdershape");
TraceEdge(trc, &propStub->getter(), "baseline-getproplistbasenative-stub-getter");
break;
}
case ICStub::GetProp_DOMProxyShadowed: {
ICGetProp_DOMProxyShadowed* propStub = toGetProp_DOMProxyShadowed();
TraceEdge(trc, &propStub->shape(), "baseline-getproplistbaseshadowed-stub-shape");
TraceEdge(trc, &propStub->name(), "baseline-getproplistbaseshadowed-stub-name");
break;
}
case ICStub::GetProp_CallScripted: {
ICGetProp_CallScripted* callStub = toGetProp_CallScripted();
callStub->receiverGuard().trace(trc);
TraceEdge(trc, &callStub->holder(), "baseline-getpropcallscripted-stub-holder");
TraceEdge(trc, &callStub->holderShape(), "baseline-getpropcallscripted-stub-holdershape");
TraceEdge(trc, &callStub->getter(), "baseline-getpropcallscripted-stub-getter");
break;
}
case ICStub::GetProp_CallNative: {
ICGetProp_CallNative* callStub = toGetProp_CallNative();
callStub->receiverGuard().trace(trc);
TraceEdge(trc, &callStub->holder(), "baseline-getpropcallnative-stub-holder");
TraceEdge(trc, &callStub->holderShape(), "baseline-getpropcallnative-stub-holdershape");
TraceEdge(trc, &callStub->getter(), "baseline-getpropcallnative-stub-getter");
break;
}
case ICStub::GetProp_CallNativeGlobal: {
ICGetProp_CallNativeGlobal* callStub = toGetProp_CallNativeGlobal();
callStub->receiverGuard().trace(trc);
TraceEdge(trc, &callStub->holder(), "baseline-getpropcallnativeglobal-stub-holder");
TraceEdge(trc, &callStub->holderShape(), "baseline-getpropcallnativeglobal-stub-holdershape");
TraceEdge(trc, &callStub->globalShape(), "baseline-getpropcallnativeglobal-stub-globalshape");
TraceEdge(trc, &callStub->getter(), "baseline-getpropcallnativeglobal-stub-getter");
break;
}
case ICStub::GetProp_ModuleNamespace: {
ICGetProp_ModuleNamespace* nsStub = toGetProp_ModuleNamespace();
TraceEdge(trc, &nsStub->getNamespace(), "baseline-getprop-modulenamespace-stub-namespace");
TraceEdge(trc, &nsStub->environment(), "baseline-getprop-modulenamespace-stub-environment");
break;
}
case ICStub::SetProp_Native: {
ICSetProp_Native* propStub = toSetProp_Native();
TraceEdge(trc, &propStub->shape(), "baseline-setpropnative-stub-shape");
TraceEdge(trc, &propStub->group(), "baseline-setpropnative-stub-group");
break;
}
case ICStub::SetProp_NativeAdd: {
ICSetProp_NativeAdd* propStub = toSetProp_NativeAdd();
TraceEdge(trc, &propStub->group(), "baseline-setpropnativeadd-stub-group");
TraceEdge(trc, &propStub->newShape(), "baseline-setpropnativeadd-stub-newshape");
if (propStub->newGroup())
TraceEdge(trc, &propStub->newGroup(), "baseline-setpropnativeadd-stub-new-group");
JS_STATIC_ASSERT(ICSetProp_NativeAdd::MAX_PROTO_CHAIN_DEPTH == 4);
switch (propStub->protoChainDepth()) {
case 0: propStub->toImpl<0>()->traceShapes(trc); break;
case 1: propStub->toImpl<1>()->traceShapes(trc); break;
case 2: propStub->toImpl<2>()->traceShapes(trc); break;
case 3: propStub->toImpl<3>()->traceShapes(trc); break;
case 4: propStub->toImpl<4>()->traceShapes(trc); break;
default: MOZ_CRASH("Invalid proto stub.");
}
break;
}
case ICStub::SetProp_Unboxed: {
ICSetProp_Unboxed* propStub = toSetProp_Unboxed();
TraceEdge(trc, &propStub->group(), "baseline-setprop-unboxed-stub-group");
break;
}
case ICStub::SetProp_TypedObject: {
ICSetProp_TypedObject* propStub = toSetProp_TypedObject();
TraceEdge(trc, &propStub->shape(), "baseline-setprop-typedobject-stub-shape");
TraceEdge(trc, &propStub->group(), "baseline-setprop-typedobject-stub-group");
break;
}
case ICStub::SetProp_CallScripted: {
ICSetProp_CallScripted* callStub = toSetProp_CallScripted();
callStub->receiverGuard().trace(trc);
TraceEdge(trc, &callStub->holder(), "baseline-setpropcallscripted-stub-holder");
TraceEdge(trc, &callStub->holderShape(), "baseline-setpropcallscripted-stub-holdershape");
TraceEdge(trc, &callStub->setter(), "baseline-setpropcallscripted-stub-setter");
break;
}
case ICStub::SetProp_CallNative: {
ICSetProp_CallNative* callStub = toSetProp_CallNative();
callStub->receiverGuard().trace(trc);
TraceEdge(trc, &callStub->holder(), "baseline-setpropcallnative-stub-holder");
TraceEdge(trc, &callStub->holderShape(), "baseline-setpropcallnative-stub-holdershape");
TraceEdge(trc, &callStub->setter(), "baseline-setpropcallnative-stub-setter");
break;
}
case ICStub::InstanceOf_Function: {
ICInstanceOf_Function* instanceofStub = toInstanceOf_Function();
TraceEdge(trc, &instanceofStub->shape(), "baseline-instanceof-fun-shape");
TraceEdge(trc, &instanceofStub->prototypeObject(), "baseline-instanceof-fun-prototype");
break;
}
case ICStub::NewArray_Fallback: {
ICNewArray_Fallback* stub = toNewArray_Fallback();
if (stub->templateObject())
TraceEdge(trc, &stub->templateObject(), "baseline-newarray-template");
TraceEdge(trc, &stub->templateGroup(), "baseline-newarray-template-group");
break;
}
case ICStub::NewObject_Fallback: {
ICNewObject_Fallback* stub = toNewObject_Fallback();
if (stub->templateObject())
TraceEdge(trc, &stub->templateObject(), "baseline-newobject-template");
break;
}
case ICStub::Rest_Fallback: {
ICRest_Fallback* stub = toRest_Fallback();
TraceEdge(trc, &stub->templateObject(), "baseline-rest-template");
break;
}
default:
break;
}
}
void
ICFallbackStub::unlinkStub(Zone* zone, ICStub* prev, ICStub* stub)
{
MOZ_ASSERT(stub->next());
// If stub is the last optimized stub, update lastStubPtrAddr.
if (stub->next() == this) {
MOZ_ASSERT(lastStubPtrAddr_ == stub->addressOfNext());
if (prev)
lastStubPtrAddr_ = prev->addressOfNext();
else
lastStubPtrAddr_ = icEntry()->addressOfFirstStub();
*lastStubPtrAddr_ = this;
} else {
if (prev) {
MOZ_ASSERT(prev->next() == stub);
prev->setNext(stub->next());
} else {
MOZ_ASSERT(icEntry()->firstStub() == stub);
icEntry()->setFirstStub(stub->next());
}
}
MOZ_ASSERT(numOptimizedStubs_ > 0);
numOptimizedStubs_--;
if (zone->needsIncrementalBarrier()) {
// We are removing edges from ICStub to gcthings. Perform one final trace
// of the stub for incremental GC, as it must know about those edges.
stub->trace(zone->barrierTracer());
}
if (ICStub::CanMakeCalls(stub->kind()) && stub->isMonitored()) {
// This stub can make calls so we can return to it if it's on the stack.
// We just have to reset its firstMonitorStub_ field to avoid a stale
// pointer when purgeOptimizedStubs destroys all optimized monitor
// stubs (unlinked stubs won't be updated).
ICTypeMonitor_Fallback* monitorFallback = toMonitoredFallbackStub()->fallbackMonitorStub();
stub->toMonitoredStub()->resetFirstMonitorStub(monitorFallback);
}
#ifdef DEBUG
// Poison stub code to ensure we don't call this stub again. However, if this
// stub can make calls, a pointer to it may be stored in a stub frame on the
// stack, so we can't touch the stubCode_ or GC will crash when marking this
// pointer.
if (!ICStub::CanMakeCalls(stub->kind()))
stub->stubCode_ = (uint8_t*)0xbad;
#endif
}
void
ICFallbackStub::unlinkStubsWithKind(JSContext* cx, ICStub::Kind kind)
{
for (ICStubIterator iter = beginChain(); !iter.atEnd(); iter++) {
if (iter->kind() == kind)
iter.unlink(cx);
}
}
void
ICTypeMonitor_Fallback::resetMonitorStubChain(Zone* zone)
{
if (zone->needsIncrementalBarrier()) {
// We are removing edges from monitored stubs to gcthings (JitCode).
// Perform one final trace of all monitor stubs for incremental GC,
// as it must know about those edges.
for (ICStub* s = firstMonitorStub_; !s->isTypeMonitor_Fallback(); s = s->next())
s->trace(zone->barrierTracer());
}
firstMonitorStub_ = this;
numOptimizedMonitorStubs_ = 0;
if (hasFallbackStub_) {
lastMonitorStubPtrAddr_ = nullptr;
// Reset firstMonitorStub_ field of all monitored stubs.
for (ICStubConstIterator iter = mainFallbackStub_->beginChainConst();
!iter.atEnd(); iter++)
{
if (!iter->isMonitored())
continue;
iter->toMonitoredStub()->resetFirstMonitorStub(this);
}
} else {
icEntry_->setFirstStub(this);
lastMonitorStubPtrAddr_ = icEntry_->addressOfFirstStub();
}
}
ICMonitoredStub::ICMonitoredStub(Kind kind, JitCode* stubCode, ICStub* firstMonitorStub)
: ICStub(kind, ICStub::Monitored, stubCode),
firstMonitorStub_(firstMonitorStub)
{
// If the first monitored stub is a ICTypeMonitor_Fallback stub, then
// double check that _its_ firstMonitorStub is the same as this one.
MOZ_ASSERT_IF(firstMonitorStub_->isTypeMonitor_Fallback(),
firstMonitorStub_->toTypeMonitor_Fallback()->firstMonitorStub() ==
firstMonitorStub_);
}
bool
ICMonitoredFallbackStub::initMonitoringChain(JSContext* cx, ICStubSpace* space,
ICStubCompiler::Engine engine)
{
MOZ_ASSERT(fallbackMonitorStub_ == nullptr);
ICTypeMonitor_Fallback::Compiler compiler(cx, engine, this);
ICTypeMonitor_Fallback* stub = compiler.getStub(space);
if (!stub)
return false;
fallbackMonitorStub_ = stub;
return true;
}
bool
ICMonitoredFallbackStub::addMonitorStubForValue(JSContext* cx, JSScript* script, HandleValue val, ICStubCompiler::Engine engine)
{
return fallbackMonitorStub_->addMonitorStubForValue(cx, script, val, engine);
}
bool
ICUpdatedStub::initUpdatingChain(JSContext* cx, ICStubSpace* space)
{
MOZ_ASSERT(firstUpdateStub_ == nullptr);
ICTypeUpdate_Fallback::Compiler compiler(cx);
ICTypeUpdate_Fallback* stub = compiler.getStub(space);
if (!stub)
return false;
firstUpdateStub_ = stub;
return true;
}
JitCode*
ICStubCompiler::getStubCode()
{
JitCompartment* comp = cx->compartment()->jitCompartment();
// Check for existing cached stubcode.
uint32_t stubKey = getKey();
JitCode* stubCode = comp->getStubCode(stubKey);
if (stubCode)
return stubCode;
// Compile new stubcode.
JitContext jctx(cx, nullptr);
MacroAssembler masm;
#ifndef JS_USE_LINK_REGISTER
// The first value contains the return addres,
// which we pull into ICTailCallReg for tail calls.
masm.adjustFrame(sizeof(intptr_t));
#endif
#ifdef JS_CODEGEN_ARM
masm.setSecondScratchReg(BaselineSecondScratchReg);
#endif
if (!generateStubCode(masm))
return nullptr;
Linker linker(masm);
AutoFlushICache afc("getStubCode");
Rooted<JitCode*> newStubCode(cx, linker.newCode<CanGC>(cx, BASELINE_CODE));
if (!newStubCode)
return nullptr;
// All barriers are emitted off-by-default, enable them if needed.
if (cx->zone()->needsIncrementalBarrier())
newStubCode->togglePreBarriers(true);
// Cache newly compiled stubcode.
if (!comp->putStubCode(cx, stubKey, newStubCode))
return nullptr;
// After generating code, run postGenerateStubCode(). We must not fail
// after this point.
postGenerateStubCode(masm, newStubCode);
MOZ_ASSERT(entersStubFrame_ == ICStub::CanMakeCalls(kind));
MOZ_ASSERT(!inStubFrame_);
#ifdef JS_ION_PERF
writePerfSpewerJitCodeProfile(newStubCode, "BaselineIC");
#endif
return newStubCode;
}
bool
ICStubCompiler::tailCallVM(const VMFunction& fun, MacroAssembler& masm)
{
JitCode* code = cx->runtime()->jitRuntime()->getVMWrapper(fun);
if (!code)
return false;
MOZ_ASSERT(fun.expectTailCall == TailCall);
uint32_t argSize = fun.explicitStackSlots() * sizeof(void*);
if (engine_ == Engine::Baseline) {
EmitBaselineTailCallVM(code, masm, argSize);
} else {
uint32_t stackSize = argSize + fun.extraValuesToPop * sizeof(Value);
EmitIonTailCallVM(code, masm, stackSize);
}
return true;
}
bool
ICStubCompiler::callVM(const VMFunction& fun, MacroAssembler& masm)
{
MOZ_ASSERT(inStubFrame_);
JitCode* code = cx->runtime()->jitRuntime()->getVMWrapper(fun);
if (!code)
return false;
MOZ_ASSERT(fun.expectTailCall == NonTailCall);
if (engine_ == Engine::Baseline)
EmitBaselineCallVM(code, masm);
else
EmitIonCallVM(code, fun.explicitStackSlots(), masm);
return true;
}
bool
ICStubCompiler::callTypeUpdateIC(MacroAssembler& masm, uint32_t objectOffset)
{
JitCode* code = cx->runtime()->jitRuntime()->getVMWrapper(DoTypeUpdateFallbackInfo);
if (!code)
return false;
EmitCallTypeUpdateIC(masm, code, objectOffset);
return true;
}
void
ICStubCompiler::enterStubFrame(MacroAssembler& masm, Register scratch)
{
if (engine_ == Engine::Baseline) {
EmitBaselineEnterStubFrame(masm, scratch);
#ifdef DEBUG
framePushedAtEnterStubFrame_ = masm.framePushed();
#endif
} else {
EmitIonEnterStubFrame(masm, scratch);
}
MOZ_ASSERT(!inStubFrame_);
inStubFrame_ = true;
#ifdef DEBUG
entersStubFrame_ = true;
#endif
}
void
ICStubCompiler::leaveStubFrame(MacroAssembler& masm, bool calledIntoIon)
{
MOZ_ASSERT(entersStubFrame_ && inStubFrame_);
inStubFrame_ = false;
if (engine_ == Engine::Baseline) {
#ifdef DEBUG
masm.setFramePushed(framePushedAtEnterStubFrame_);
if (calledIntoIon)
masm.adjustFrame(sizeof(intptr_t)); // Calls into ion have this extra.
#endif
EmitBaselineLeaveStubFrame(masm, calledIntoIon);
} else {
EmitIonLeaveStubFrame(masm);
}
}
void
ICStubCompiler::pushFramePtr(MacroAssembler& masm, Register scratch)
{
if (engine_ == Engine::IonMonkey) {
masm.push(Imm32(0));
return;
}
if (inStubFrame_) {
masm.loadPtr(Address(BaselineFrameReg, 0), scratch);
masm.pushBaselineFramePtr(scratch, scratch);
} else {
masm.pushBaselineFramePtr(BaselineFrameReg, scratch);
}
}
void
ICStubCompiler::PushFramePtr(MacroAssembler& masm, Register scratch)
{
pushFramePtr(masm, scratch);
masm.adjustFrame(sizeof(intptr_t));
}
bool
ICStubCompiler::emitPostWriteBarrierSlot(MacroAssembler& masm, Register obj, ValueOperand val,
Register scratch, LiveGeneralRegisterSet saveRegs)
{
Label skipBarrier;
masm.branchPtrInNurseryRange(Assembler::Equal, obj, scratch, &skipBarrier);
masm.branchValueIsNurseryObject(Assembler::NotEqual, val, scratch, &skipBarrier);
// void PostWriteBarrier(JSRuntime* rt, JSObject* obj);
#if defined(JS_CODEGEN_ARM) || defined(JS_CODEGEN_MIPS32) || defined(JS_CODEGEN_MIPS64)
saveRegs.add(ICTailCallReg);
#endif
saveRegs.set() = GeneralRegisterSet::Intersect(saveRegs.set(), GeneralRegisterSet::Volatile());
masm.PushRegsInMask(saveRegs);
masm.setupUnalignedABICall(scratch);
masm.movePtr(ImmPtr(cx->runtime()), scratch);
masm.passABIArg(scratch);
masm.passABIArg(obj);
masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, PostWriteBarrier));
masm.PopRegsInMask(saveRegs);
masm.bind(&skipBarrier);
return true;
}
static ICStubCompiler::Engine
SharedStubEngine(BaselineFrame* frame)
{
return frame ? ICStubCompiler::Engine::Baseline : ICStubCompiler::Engine::IonMonkey;
}
template<typename T>
static JSScript*
SharedStubScript(BaselineFrame* frame, T* stub)
{
ICStubCompiler::Engine engine = SharedStubEngine(frame);
if (engine == ICStubCompiler::Engine::Baseline)
return frame->script();
IonICEntry* entry = (IonICEntry*) stub->icEntry();
return entry->script();
}
//
// BinaryArith_Fallback
//
static bool
DoBinaryArithFallback(JSContext* cx, BaselineFrame* frame, ICBinaryArith_Fallback* stub_,
HandleValue lhs, HandleValue rhs, MutableHandleValue ret)
{
ICStubCompiler::Engine engine = SharedStubEngine(frame);
RootedScript script(cx, SharedStubScript(frame, stub_));
// This fallback stub may trigger debug mode toggling.
DebugModeOSRVolatileStub<ICBinaryArith_Fallback*> stub(engine, frame, stub_);
jsbytecode* pc = stub->icEntry()->pc(script);
JSOp op = JSOp(*pc);
FallbackICSpew(cx, stub, "BinaryArith(%s,%d,%d)", CodeName[op],
int(lhs.isDouble() ? JSVAL_TYPE_DOUBLE : lhs.extractNonDoubleType()),
int(rhs.isDouble() ? JSVAL_TYPE_DOUBLE : rhs.extractNonDoubleType()));
// Don't pass lhs/rhs directly, we need the original values when
// generating stubs.
RootedValue lhsCopy(cx, lhs);
RootedValue rhsCopy(cx, rhs);
// Perform the compare operation.
switch(op) {
case JSOP_ADD:
// Do an add.
if (!AddValues(cx, &lhsCopy, &rhsCopy, ret))
return false;
break;
case JSOP_SUB:
if (!SubValues(cx, &lhsCopy, &rhsCopy, ret))
return false;
break;
case JSOP_MUL:
if (!MulValues(cx, &lhsCopy, &rhsCopy, ret))
return false;
break;
case JSOP_DIV:
if (!DivValues(cx, &lhsCopy, &rhsCopy, ret))
return false;
break;
case JSOP_MOD:
if (!ModValues(cx, &lhsCopy, &rhsCopy, ret))
return false;
break;
case JSOP_POW:
if (!math_pow_handle(cx, lhsCopy, rhsCopy, ret))
return false;
break;
case JSOP_BITOR: {
int32_t result;
if (!BitOr(cx, lhs, rhs, &result))
return false;
ret.setInt32(result);
break;
}
case JSOP_BITXOR: {
int32_t result;
if (!BitXor(cx, lhs, rhs, &result))
return false;
ret.setInt32(result);
break;
}
case JSOP_BITAND: {
int32_t result;
if (!BitAnd(cx, lhs, rhs, &result))
return false;
ret.setInt32(result);
break;
}
case JSOP_LSH: {
int32_t result;
if (!BitLsh(cx, lhs, rhs, &result))
return false;
ret.setInt32(result);
break;
}
case JSOP_RSH: {
int32_t result;
if (!BitRsh(cx, lhs, rhs, &result))
return false;
ret.setInt32(result);
break;
}
case JSOP_URSH: {
if (!UrshOperation(cx, lhs, rhs, ret))
return false;
break;
}
default:
MOZ_CRASH("Unhandled baseline arith op");
}
// Check if debug mode toggling made the stub invalid.
if (stub.invalid())
return true;
if (ret.isDouble())
stub->setSawDoubleResult();
// Check to see if a new stub should be generated.
if (stub->numOptimizedStubs() >= ICBinaryArith_Fallback::MAX_OPTIMIZED_STUBS) {
stub->noteUnoptimizableOperands();
return true;
}
// Handle string concat.
if (op == JSOP_ADD) {
if (lhs.isString() && rhs.isString()) {
JitSpew(JitSpew_BaselineIC, " Generating %s(String, String) stub", CodeName[op]);
MOZ_ASSERT(ret.isString());
ICBinaryArith_StringConcat::Compiler compiler(cx, engine);
ICStub* strcatStub = compiler.getStub(compiler.getStubSpace(script));
if (!strcatStub)
return false;
stub->addNewStub(strcatStub);
return true;
}
if ((lhs.isString() && rhs.isObject()) || (lhs.isObject() && rhs.isString())) {
JitSpew(JitSpew_BaselineIC, " Generating %s(%s, %s) stub", CodeName[op],
lhs.isString() ? "String" : "Object",
lhs.isString() ? "Object" : "String");
MOZ_ASSERT(ret.isString());
ICBinaryArith_StringObjectConcat::Compiler compiler(cx, engine, lhs.isString());
ICStub* strcatStub = compiler.getStub(compiler.getStubSpace(script));
if (!strcatStub)
return false;
stub->addNewStub(strcatStub);
return true;
}
}
if (((lhs.isBoolean() && (rhs.isBoolean() || rhs.isInt32())) ||
(rhs.isBoolean() && (lhs.isBoolean() || lhs.isInt32()))) &&
(op == JSOP_ADD || op == JSOP_SUB || op == JSOP_BITOR || op == JSOP_BITAND ||
op == JSOP_BITXOR))
{
JitSpew(JitSpew_BaselineIC, " Generating %s(%s, %s) stub", CodeName[op],
lhs.isBoolean() ? "Boolean" : "Int32", rhs.isBoolean() ? "Boolean" : "Int32");
ICBinaryArith_BooleanWithInt32::Compiler compiler(cx, op, engine,
lhs.isBoolean(), rhs.isBoolean());
ICStub* arithStub = compiler.getStub(compiler.getStubSpace(script));
if (!arithStub)
return false;
stub->addNewStub(arithStub);
return true;
}
// Handle only int32 or double.
if (!lhs.isNumber() || !rhs.isNumber()) {
stub->noteUnoptimizableOperands();
return true;
}
MOZ_ASSERT(ret.isNumber());
if (lhs.isDouble() || rhs.isDouble() || ret.isDouble()) {
if (!cx->runtime()->jitSupportsFloatingPoint)
return true;
switch (op) {
case JSOP_ADD:
case JSOP_SUB:
case JSOP_MUL:
case JSOP_DIV:
case JSOP_MOD: {
// Unlink int32 stubs, it's faster to always use the double stub.
stub->unlinkStubsWithKind(cx, ICStub::BinaryArith_Int32);
JitSpew(JitSpew_BaselineIC, " Generating %s(Double, Double) stub", CodeName[op]);
ICBinaryArith_Double::Compiler compiler(cx, op, engine);
ICStub* doubleStub = compiler.getStub(compiler.getStubSpace(script));
if (!doubleStub)
return false;
stub->addNewStub(doubleStub);
return true;
}
default:
break;
}
}
if (lhs.isInt32() && rhs.isInt32() && op != JSOP_POW) {
bool allowDouble = ret.isDouble();
if (allowDouble)
stub->unlinkStubsWithKind(cx, ICStub::BinaryArith_Int32);
JitSpew(JitSpew_BaselineIC, " Generating %s(Int32, Int32%s) stub", CodeName[op],
allowDouble ? " => Double" : "");
ICBinaryArith_Int32::Compiler compilerInt32(cx, op, engine, allowDouble);
ICStub* int32Stub = compilerInt32.getStub(compilerInt32.getStubSpace(script));
if (!int32Stub)
return false;
stub->addNewStub(int32Stub);
return true;
}
// Handle Double <BITOP> Int32 or Int32 <BITOP> Double case.
if (((lhs.isDouble() && rhs.isInt32()) || (lhs.isInt32() && rhs.isDouble())) &&
ret.isInt32())
{
switch(op) {
case JSOP_BITOR:
case JSOP_BITXOR:
case JSOP_BITAND: {
JitSpew(JitSpew_BaselineIC, " Generating %s(%s, %s) stub", CodeName[op],
lhs.isDouble() ? "Double" : "Int32",
lhs.isDouble() ? "Int32" : "Double");
ICBinaryArith_DoubleWithInt32::Compiler compiler(cx, op, engine, lhs.isDouble());
ICStub* optStub = compiler.getStub(compiler.getStubSpace(script));
if (!optStub)
return false;
stub->addNewStub(optStub);
return true;
}
default:
break;
}
}
stub->noteUnoptimizableOperands();
return true;
}
typedef bool (*DoBinaryArithFallbackFn)(JSContext*, BaselineFrame*, ICBinaryArith_Fallback*,
HandleValue, HandleValue, MutableHandleValue);
static const VMFunction DoBinaryArithFallbackInfo =
FunctionInfo<DoBinaryArithFallbackFn>(DoBinaryArithFallback, TailCall, PopValues(2));
bool
ICBinaryArith_Fallback::Compiler::generateStubCode(MacroAssembler& masm)
{
MOZ_ASSERT(R0 == JSReturnOperand);
// Restore the tail call register.
EmitRestoreTailCallReg(masm);
// Ensure stack is fully synced for the expression decompiler.
masm.pushValue(R0);
masm.pushValue(R1);
// Push arguments.
masm.pushValue(R1);
masm.pushValue(R0);
masm.push(ICStubReg);
pushFramePtr(masm, R0.scratchReg());
return tailCallVM(DoBinaryArithFallbackInfo, masm);
}
static bool
DoConcatStrings(JSContext* cx, HandleString lhs, HandleString rhs, MutableHandleValue res)
{
JSString* result = ConcatStrings<CanGC>(cx, lhs, rhs);
if (!result)
return false;
res.setString(result);
return true;
}
typedef bool (*DoConcatStringsFn)(JSContext*, HandleString, HandleString, MutableHandleValue);
static const VMFunction DoConcatStringsInfo = FunctionInfo<DoConcatStringsFn>(DoConcatStrings, TailCall);
bool
ICBinaryArith_StringConcat::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestString(Assembler::NotEqual, R0, &failure);
masm.branchTestString(Assembler::NotEqual, R1, &failure);
// Restore the tail call register.
EmitRestoreTailCallReg(masm);
masm.unboxString(R0, R0.scratchReg());
masm.unboxString(R1, R1.scratchReg());
masm.push(R1.scratchReg());
masm.push(R0.scratchReg());
if (!tailCallVM(DoConcatStringsInfo, masm))
return false;
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
static JSString*
ConvertObjectToStringForConcat(JSContext* cx, HandleValue obj)
{
MOZ_ASSERT(obj.isObject());
RootedValue rootedObj(cx, obj);
if (!ToPrimitive(cx, &rootedObj))
return nullptr;
return ToString<CanGC>(cx, rootedObj);
}
static bool
DoConcatStringObject(JSContext* cx, bool lhsIsString, HandleValue lhs, HandleValue rhs,
MutableHandleValue res)
{
JSString* lstr = nullptr;
JSString* rstr = nullptr;
if (lhsIsString) {
// Convert rhs first.
MOZ_ASSERT(lhs.isString() && rhs.isObject());
rstr = ConvertObjectToStringForConcat(cx, rhs);
if (!rstr)
return false;
// lhs is already string.
lstr = lhs.toString();
} else {
MOZ_ASSERT(rhs.isString() && lhs.isObject());
// Convert lhs first.
lstr = ConvertObjectToStringForConcat(cx, lhs);
if (!lstr)
return false;
// rhs is already string.
rstr = rhs.toString();
}
JSString* str = ConcatStrings<NoGC>(cx, lstr, rstr);
if (!str) {
RootedString nlstr(cx, lstr), nrstr(cx, rstr);
str = ConcatStrings<CanGC>(cx, nlstr, nrstr);
if (!str)
return false;
}
// Technically, we need to call TypeScript::MonitorString for this PC, however
// it was called when this stub was attached so it's OK.
res.setString(str);
return true;
}
typedef bool (*DoConcatStringObjectFn)(JSContext*, bool lhsIsString, HandleValue, HandleValue,
MutableHandleValue);
static const VMFunction DoConcatStringObjectInfo =
FunctionInfo<DoConcatStringObjectFn>(DoConcatStringObject, TailCall, PopValues(2));
bool
ICBinaryArith_StringObjectConcat::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
if (lhsIsString_) {
masm.branchTestString(Assembler::NotEqual, R0, &failure);
masm.branchTestObject(Assembler::NotEqual, R1, &failure);
} else {
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
masm.branchTestString(Assembler::NotEqual, R1, &failure);
}
// Restore the tail call register.
EmitRestoreTailCallReg(masm);
// Sync for the decompiler.
masm.pushValue(R0);
masm.pushValue(R1);
// Push arguments.
masm.pushValue(R1);
masm.pushValue(R0);
masm.push(Imm32(lhsIsString_));
if (!tailCallVM(DoConcatStringObjectInfo, masm))
return false;
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICBinaryArith_Double::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.ensureDouble(R0, FloatReg0, &failure);
masm.ensureDouble(R1, FloatReg1, &failure);
switch (op) {
case JSOP_ADD:
masm.addDouble(FloatReg1, FloatReg0);
break;
case JSOP_SUB:
masm.subDouble(FloatReg1, FloatReg0);
break;
case JSOP_MUL:
masm.mulDouble(FloatReg1, FloatReg0);
break;
case JSOP_DIV:
masm.divDouble(FloatReg1, FloatReg0);
break;
case JSOP_MOD:
masm.setupUnalignedABICall(R0.scratchReg());
masm.passABIArg(FloatReg0, MoveOp::DOUBLE);
masm.passABIArg(FloatReg1, MoveOp::DOUBLE);
masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, NumberMod), MoveOp::DOUBLE);
MOZ_ASSERT(ReturnDoubleReg == FloatReg0);
break;
default:
MOZ_CRASH("Unexpected op");
}
masm.boxDouble(FloatReg0, R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICBinaryArith_BooleanWithInt32::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
if (lhsIsBool_)
masm.branchTestBoolean(Assembler::NotEqual, R0, &failure);
else
masm.branchTestInt32(Assembler::NotEqual, R0, &failure);
if (rhsIsBool_)
masm.branchTestBoolean(Assembler::NotEqual, R1, &failure);
else
masm.branchTestInt32(Assembler::NotEqual, R1, &failure);
Register lhsReg = lhsIsBool_ ? masm.extractBoolean(R0, ExtractTemp0)
: masm.extractInt32(R0, ExtractTemp0);
Register rhsReg = rhsIsBool_ ? masm.extractBoolean(R1, ExtractTemp1)
: masm.extractInt32(R1, ExtractTemp1);
MOZ_ASSERT(op_ == JSOP_ADD || op_ == JSOP_SUB ||
op_ == JSOP_BITOR || op_ == JSOP_BITXOR || op_ == JSOP_BITAND);
switch(op_) {
case JSOP_ADD: {
Label fixOverflow;
masm.branchAdd32(Assembler::Overflow, rhsReg, lhsReg, &fixOverflow);
masm.tagValue(JSVAL_TYPE_INT32, lhsReg, R0);
EmitReturnFromIC(masm);
masm.bind(&fixOverflow);
masm.sub32(rhsReg, lhsReg);
// Proceed to failure below.
break;
}
case JSOP_SUB: {
Label fixOverflow;
masm.branchSub32(Assembler::Overflow, rhsReg, lhsReg, &fixOverflow);
masm.tagValue(JSVAL_TYPE_INT32, lhsReg, R0);
EmitReturnFromIC(masm);
masm.bind(&fixOverflow);
masm.add32(rhsReg, lhsReg);
// Proceed to failure below.
break;
}
case JSOP_BITOR: {
masm.orPtr(rhsReg, lhsReg);
masm.tagValue(JSVAL_TYPE_INT32, lhsReg, R0);
EmitReturnFromIC(masm);
break;
}
case JSOP_BITXOR: {
masm.xorPtr(rhsReg, lhsReg);
masm.tagValue(JSVAL_TYPE_INT32, lhsReg, R0);
EmitReturnFromIC(masm);
break;
}
case JSOP_BITAND: {
masm.andPtr(rhsReg, lhsReg);
masm.tagValue(JSVAL_TYPE_INT32, lhsReg, R0);
EmitReturnFromIC(masm);
break;
}
default:
MOZ_CRASH("Unhandled op for BinaryArith_BooleanWithInt32.");
}
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICBinaryArith_DoubleWithInt32::Compiler::generateStubCode(MacroAssembler& masm)
{
MOZ_ASSERT(op == JSOP_BITOR || op == JSOP_BITAND || op == JSOP_BITXOR);
Label failure;
Register intReg;
Register scratchReg;
if (lhsIsDouble_) {
masm.branchTestDouble(Assembler::NotEqual, R0, &failure);
masm.branchTestInt32(Assembler::NotEqual, R1, &failure);
intReg = masm.extractInt32(R1, ExtractTemp0);
masm.unboxDouble(R0, FloatReg0);
scratchReg = R0.scratchReg();
} else {
masm.branchTestInt32(Assembler::NotEqual, R0, &failure);
masm.branchTestDouble(Assembler::NotEqual, R1, &failure);
intReg = masm.extractInt32(R0, ExtractTemp0);
masm.unboxDouble(R1, FloatReg0);
scratchReg = R1.scratchReg();
}
// Truncate the double to an int32.
{
Label doneTruncate;
Label truncateABICall;
masm.branchTruncateDouble(FloatReg0, scratchReg, &truncateABICall);
masm.jump(&doneTruncate);
masm.bind(&truncateABICall);
masm.push(intReg);
masm.setupUnalignedABICall(scratchReg);
masm.passABIArg(FloatReg0, MoveOp::DOUBLE);
masm.callWithABI(mozilla::BitwiseCast<void*, int32_t(*)(double)>(JS::ToInt32));
masm.storeCallResult(scratchReg);
masm.pop(intReg);
masm.bind(&doneTruncate);
}
Register intReg2 = scratchReg;
// All handled ops commute, so no need to worry about ordering.
switch(op) {
case JSOP_BITOR:
masm.orPtr(intReg, intReg2);
break;
case JSOP_BITXOR:
masm.xorPtr(intReg, intReg2);
break;
case JSOP_BITAND:
masm.andPtr(intReg, intReg2);
break;
default:
MOZ_CRASH("Unhandled op for BinaryArith_DoubleWithInt32.");
}
masm.tagValue(JSVAL_TYPE_INT32, intReg2, R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// UnaryArith_Fallback
//
static bool
DoUnaryArithFallback(JSContext* cx, BaselineFrame* frame, ICUnaryArith_Fallback* stub_,
HandleValue val, MutableHandleValue res)
{
ICStubCompiler::Engine engine = SharedStubEngine(frame);
RootedScript script(cx, SharedStubScript(frame, stub_));
// This fallback stub may trigger debug mode toggling.
DebugModeOSRVolatileStub<ICUnaryArith_Fallback*> stub(engine, frame, stub_);
jsbytecode* pc = stub->icEntry()->pc(script);
JSOp op = JSOp(*pc);
FallbackICSpew(cx, stub, "UnaryArith(%s)", CodeName[op]);
switch (op) {
case JSOP_BITNOT: {
int32_t result;
if (!BitNot(cx, val, &result))
return false;
res.setInt32(result);
break;
}
case JSOP_NEG:
if (!NegOperation(cx, script, pc, val, res))
return false;
break;
default:
MOZ_CRASH("Unexpected op");
}
// Check if debug mode toggling made the stub invalid.
if (stub.invalid())
return true;
if (res.isDouble())
stub->setSawDoubleResult();
if (stub->numOptimizedStubs() >= ICUnaryArith_Fallback::MAX_OPTIMIZED_STUBS) {
// TODO: Discard/replace stubs.
return true;
}
if (val.isInt32() && res.isInt32()) {
JitSpew(JitSpew_BaselineIC, " Generating %s(Int32 => Int32) stub", CodeName[op]);
ICUnaryArith_Int32::Compiler compiler(cx, op, engine);
ICStub* int32Stub = compiler.getStub(compiler.getStubSpace(script));
if (!int32Stub)
return false;
stub->addNewStub(int32Stub);
return true;
}
if (val.isNumber() && res.isNumber() && cx->runtime()->jitSupportsFloatingPoint) {
JitSpew(JitSpew_BaselineIC, " Generating %s(Number => Number) stub", CodeName[op]);
// Unlink int32 stubs, the double stub handles both cases and TI specializes for both.
stub->unlinkStubsWithKind(cx, ICStub::UnaryArith_Int32);
ICUnaryArith_Double::Compiler compiler(cx, op, engine);
ICStub* doubleStub = compiler.getStub(compiler.getStubSpace(script));
if (!doubleStub)
return false;
stub->addNewStub(doubleStub);
return true;
}
return true;
}
typedef bool (*DoUnaryArithFallbackFn)(JSContext*, BaselineFrame*, ICUnaryArith_Fallback*,
HandleValue, MutableHandleValue);
static const VMFunction DoUnaryArithFallbackInfo =
FunctionInfo<DoUnaryArithFallbackFn>(DoUnaryArithFallback, TailCall, PopValues(1));
bool
ICUnaryArith_Fallback::Compiler::generateStubCode(MacroAssembler& masm)
{
MOZ_ASSERT(R0 == JSReturnOperand);
// Restore the tail call register.
EmitRestoreTailCallReg(masm);
// Ensure stack is fully synced for the expression decompiler.
masm.pushValue(R0);
// Push arguments.
masm.pushValue(R0);
masm.push(ICStubReg);
pushFramePtr(masm, R0.scratchReg());
return tailCallVM(DoUnaryArithFallbackInfo, masm);
}
bool
ICUnaryArith_Double::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.ensureDouble(R0, FloatReg0, &failure);
MOZ_ASSERT(op == JSOP_NEG || op == JSOP_BITNOT);
if (op == JSOP_NEG) {
masm.negateDouble(FloatReg0);
masm.boxDouble(FloatReg0, R0);
} else {
// Truncate the double to an int32.
Register scratchReg = R1.scratchReg();
Label doneTruncate;
Label truncateABICall;
masm.branchTruncateDouble(FloatReg0, scratchReg, &truncateABICall);
masm.jump(&doneTruncate);
masm.bind(&truncateABICall);
masm.setupUnalignedABICall(scratchReg);
masm.passABIArg(FloatReg0, MoveOp::DOUBLE);
masm.callWithABI(BitwiseCast<void*, int32_t(*)(double)>(JS::ToInt32));
masm.storeCallResult(scratchReg);
masm.bind(&doneTruncate);
masm.not32(scratchReg);
masm.tagValue(JSVAL_TYPE_INT32, scratchReg, R0);
}
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// Compare_Fallback
//
static bool
DoCompareFallback(JSContext* cx, BaselineFrame* frame, ICCompare_Fallback* stub_, HandleValue lhs,
HandleValue rhs, MutableHandleValue ret)
{
ICStubCompiler::Engine engine = SharedStubEngine(frame);
RootedScript script(cx, SharedStubScript(frame, stub_));
// This fallback stub may trigger debug mode toggling.
DebugModeOSRVolatileStub<ICCompare_Fallback*> stub(engine, frame, stub_);
jsbytecode* pc = stub->icEntry()->pc(script);
JSOp op = JSOp(*pc);
FallbackICSpew(cx, stub, "Compare(%s)", CodeName[op]);
// Case operations in a CONDSWITCH are performing strict equality.
if (op == JSOP_CASE)
op = JSOP_STRICTEQ;
// Don't pass lhs/rhs directly, we need the original values when
// generating stubs.
RootedValue lhsCopy(cx, lhs);
RootedValue rhsCopy(cx, rhs);
// Perform the compare operation.
bool out;
switch(op) {
case JSOP_LT:
if (!LessThan(cx, &lhsCopy, &rhsCopy, &out))
return false;
break;
case JSOP_LE:
if (!LessThanOrEqual(cx, &lhsCopy, &rhsCopy, &out))
return false;
break;
case JSOP_GT:
if (!GreaterThan(cx, &lhsCopy, &rhsCopy, &out))
return false;
break;
case JSOP_GE:
if (!GreaterThanOrEqual(cx, &lhsCopy, &rhsCopy, &out))
return false;
break;
case JSOP_EQ:
if (!LooselyEqual<true>(cx, &lhsCopy, &rhsCopy, &out))
return false;
break;
case JSOP_NE:
if (!LooselyEqual<false>(cx, &lhsCopy, &rhsCopy, &out))
return false;
break;
case JSOP_STRICTEQ:
if (!StrictlyEqual<true>(cx, &lhsCopy, &rhsCopy, &out))
return false;
break;
case JSOP_STRICTNE:
if (!StrictlyEqual<false>(cx, &lhsCopy, &rhsCopy, &out))
return false;
break;
default:
MOZ_ASSERT(!"Unhandled baseline compare op");
return false;
}
ret.setBoolean(out);
// Check if debug mode toggling made the stub invalid.
if (stub.invalid())
return true;
// Check to see if a new stub should be generated.
if (stub->numOptimizedStubs() >= ICCompare_Fallback::MAX_OPTIMIZED_STUBS) {
// TODO: Discard all stubs in this IC and replace with inert megamorphic stub.
// But for now we just bail.
return true;
}
// Try to generate new stubs.
if (lhs.isInt32() && rhs.isInt32()) {
JitSpew(JitSpew_BaselineIC, " Generating %s(Int32, Int32) stub", CodeName[op]);
ICCompare_Int32::Compiler compiler(cx, op, engine);
ICStub* int32Stub = compiler.getStub(compiler.getStubSpace(script));
if (!int32Stub)
return false;
stub->addNewStub(int32Stub);
return true;
}
if (!cx->runtime()->jitSupportsFloatingPoint && (lhs.isNumber() || rhs.isNumber()))
return true;
if (lhs.isNumber() && rhs.isNumber()) {
JitSpew(JitSpew_BaselineIC, " Generating %s(Number, Number) stub", CodeName[op]);
// Unlink int32 stubs, it's faster to always use the double stub.
stub->unlinkStubsWithKind(cx, ICStub::Compare_Int32);
ICCompare_Double::Compiler compiler(cx, op, engine);
ICStub* doubleStub = compiler.getStub(compiler.getStubSpace(script));
if (!doubleStub)
return false;
stub->addNewStub(doubleStub);
return true;
}
if ((lhs.isNumber() && rhs.isUndefined()) ||
(lhs.isUndefined() && rhs.isNumber()))
{
JitSpew(JitSpew_BaselineIC, " Generating %s(%s, %s) stub", CodeName[op],
rhs.isUndefined() ? "Number" : "Undefined",
rhs.isUndefined() ? "Undefined" : "Number");
ICCompare_NumberWithUndefined::Compiler compiler(cx, op, engine, lhs.isUndefined());
ICStub* doubleStub = compiler.getStub(compiler.getStubSpace(script));
if (!doubleStub)
return false;
stub->addNewStub(doubleStub);
return true;
}
if (lhs.isBoolean() && rhs.isBoolean()) {
JitSpew(JitSpew_BaselineIC, " Generating %s(Boolean, Boolean) stub", CodeName[op]);
ICCompare_Boolean::Compiler compiler(cx, op, engine);
ICStub* booleanStub = compiler.getStub(compiler.getStubSpace(script));
if (!booleanStub)
return false;
stub->addNewStub(booleanStub);
return true;
}
if ((lhs.isBoolean() && rhs.isInt32()) || (lhs.isInt32() && rhs.isBoolean())) {
JitSpew(JitSpew_BaselineIC, " Generating %s(%s, %s) stub", CodeName[op],
rhs.isInt32() ? "Boolean" : "Int32",
rhs.isInt32() ? "Int32" : "Boolean");
ICCompare_Int32WithBoolean::Compiler compiler(cx, op, engine, lhs.isInt32());
ICStub* optStub = compiler.getStub(compiler.getStubSpace(script));
if (!optStub)
return false;
stub->addNewStub(optStub);
return true;
}
if (IsEqualityOp(op)) {
if (lhs.isString() && rhs.isString() && !stub->hasStub(ICStub::Compare_String)) {
JitSpew(JitSpew_BaselineIC, " Generating %s(String, String) stub", CodeName[op]);
ICCompare_String::Compiler compiler(cx, op, engine);
ICStub* stringStub = compiler.getStub(compiler.getStubSpace(script));
if (!stringStub)
return false;
stub->addNewStub(stringStub);
return true;
}
if (lhs.isObject() && rhs.isObject()) {
MOZ_ASSERT(!stub->hasStub(ICStub::Compare_Object));
JitSpew(JitSpew_BaselineIC, " Generating %s(Object, Object) stub", CodeName[op]);
ICCompare_Object::Compiler compiler(cx, op, engine);
ICStub* objectStub = compiler.getStub(compiler.getStubSpace(script));
if (!objectStub)
return false;
stub->addNewStub(objectStub);
return true;
}
if ((lhs.isObject() || lhs.isNull() || lhs.isUndefined()) &&
(rhs.isObject() || rhs.isNull() || rhs.isUndefined()) &&
!stub->hasStub(ICStub::Compare_ObjectWithUndefined))
{
JitSpew(JitSpew_BaselineIC, " Generating %s(Obj/Null/Undef, Obj/Null/Undef) stub",
CodeName[op]);
bool lhsIsUndefined = lhs.isNull() || lhs.isUndefined();
bool compareWithNull = lhs.isNull() || rhs.isNull();
ICCompare_ObjectWithUndefined::Compiler compiler(cx, op, engine,
lhsIsUndefined, compareWithNull);
ICStub* objectStub = compiler.getStub(compiler.getStubSpace(script));
if (!objectStub)
return false;
stub->addNewStub(objectStub);
return true;
}
}
stub->noteUnoptimizableAccess();
return true;
}
typedef bool (*DoCompareFallbackFn)(JSContext*, BaselineFrame*, ICCompare_Fallback*,
HandleValue, HandleValue, MutableHandleValue);
static const VMFunction DoCompareFallbackInfo =
FunctionInfo<DoCompareFallbackFn>(DoCompareFallback, TailCall, PopValues(2));
bool
ICCompare_Fallback::Compiler::generateStubCode(MacroAssembler& masm)
{
MOZ_ASSERT(R0 == JSReturnOperand);
// Restore the tail call register.
EmitRestoreTailCallReg(masm);
// Ensure stack is fully synced for the expression decompiler.
masm.pushValue(R0);
masm.pushValue(R1);
// Push arguments.
masm.pushValue(R1);
masm.pushValue(R0);
masm.push(ICStubReg);
pushFramePtr(masm, R0.scratchReg());
return tailCallVM(DoCompareFallbackInfo, masm);
}
//
// Compare_String
//
bool
ICCompare_String::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestString(Assembler::NotEqual, R0, &failure);
masm.branchTestString(Assembler::NotEqual, R1, &failure);
MOZ_ASSERT(IsEqualityOp(op));
Register left = masm.extractString(R0, ExtractTemp0);
Register right = masm.extractString(R1, ExtractTemp1);
AllocatableGeneralRegisterSet regs(availableGeneralRegs(2));
Register scratchReg = regs.takeAny();
masm.compareStrings(op, left, right, scratchReg, &failure);
masm.tagValue(JSVAL_TYPE_BOOLEAN, scratchReg, R0);
EmitReturnFromIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// Compare_Boolean
//
bool
ICCompare_Boolean::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestBoolean(Assembler::NotEqual, R0, &failure);
masm.branchTestBoolean(Assembler::NotEqual, R1, &failure);
Register left = masm.extractInt32(R0, ExtractTemp0);
Register right = masm.extractInt32(R1, ExtractTemp1);
// Compare payload regs of R0 and R1.
Assembler::Condition cond = JSOpToCondition(op, /* signed = */true);
masm.cmp32Set(cond, left, right, left);
// Box the result and return
masm.tagValue(JSVAL_TYPE_BOOLEAN, left, R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// Compare_NumberWithUndefined
//
bool
ICCompare_NumberWithUndefined::Compiler::generateStubCode(MacroAssembler& masm)
{
ValueOperand numberOperand, undefinedOperand;
if (lhsIsUndefined) {
numberOperand = R1;
undefinedOperand = R0;
} else {
numberOperand = R0;
undefinedOperand = R1;
}
Label failure;
masm.branchTestNumber(Assembler::NotEqual, numberOperand, &failure);
masm.branchTestUndefined(Assembler::NotEqual, undefinedOperand, &failure);
// Comparing a number with undefined will always be true for NE/STRICTNE,
// and always be false for other compare ops.
masm.moveValue(BooleanValue(op == JSOP_NE || op == JSOP_STRICTNE), R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// Compare_Object
//
bool
ICCompare_Object::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
masm.branchTestObject(Assembler::NotEqual, R1, &failure);
MOZ_ASSERT(IsEqualityOp(op));
Register left = masm.extractObject(R0, ExtractTemp0);
Register right = masm.extractObject(R1, ExtractTemp1);
Label ifTrue;
masm.branchPtr(JSOpToCondition(op, /* signed = */true), left, right, &ifTrue);
masm.moveValue(BooleanValue(false), R0);
EmitReturnFromIC(masm);
masm.bind(&ifTrue);
masm.moveValue(BooleanValue(true), R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// Compare_ObjectWithUndefined
//
bool
ICCompare_ObjectWithUndefined::Compiler::generateStubCode(MacroAssembler& masm)
{
MOZ_ASSERT(IsEqualityOp(op));
ValueOperand objectOperand, undefinedOperand;
if (lhsIsUndefined) {
objectOperand = R1;
undefinedOperand = R0;
} else {
objectOperand = R0;
undefinedOperand = R1;
}
Label failure;
if (compareWithNull)
masm.branchTestNull(Assembler::NotEqual, undefinedOperand, &failure);
else
masm.branchTestUndefined(Assembler::NotEqual, undefinedOperand, &failure);
Label notObject;
masm.branchTestObject(Assembler::NotEqual, objectOperand, &notObject);
if (op == JSOP_STRICTEQ || op == JSOP_STRICTNE) {
// obj !== undefined for all objects.
masm.moveValue(BooleanValue(op == JSOP_STRICTNE), R0);
EmitReturnFromIC(masm);
} else {
// obj != undefined only where !obj->getClass()->emulatesUndefined()
Label emulatesUndefined;
Register obj = masm.extractObject(objectOperand, ExtractTemp0);
masm.loadPtr(Address(obj, JSObject::offsetOfGroup()), obj);
masm.loadPtr(Address(obj, ObjectGroup::offsetOfClasp()), obj);
masm.branchTest32(Assembler::NonZero,
Address(obj, Class::offsetOfFlags()),
Imm32(JSCLASS_EMULATES_UNDEFINED),
&emulatesUndefined);
masm.moveValue(BooleanValue(op == JSOP_NE), R0);
EmitReturnFromIC(masm);
masm.bind(&emulatesUndefined);
masm.moveValue(BooleanValue(op == JSOP_EQ), R0);
EmitReturnFromIC(masm);
}
masm.bind(&notObject);
// Also support null == null or undefined == undefined comparisons.
if (compareWithNull)
masm.branchTestNull(Assembler::NotEqual, objectOperand, &failure);
else
masm.branchTestUndefined(Assembler::NotEqual, objectOperand, &failure);
masm.moveValue(BooleanValue(op == JSOP_STRICTEQ || op == JSOP_EQ), R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// Compare_Int32WithBoolean
//
bool
ICCompare_Int32WithBoolean::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
ValueOperand int32Val;
ValueOperand boolVal;
if (lhsIsInt32_) {
int32Val = R0;
boolVal = R1;
} else {
boolVal = R0;
int32Val = R1;
}
masm.branchTestBoolean(Assembler::NotEqual, boolVal, &failure);
masm.branchTestInt32(Assembler::NotEqual, int32Val, &failure);
if (op_ == JSOP_STRICTEQ || op_ == JSOP_STRICTNE) {
// Ints and booleans are never strictly equal, always strictly not equal.
masm.moveValue(BooleanValue(op_ == JSOP_STRICTNE), R0);
EmitReturnFromIC(masm);
} else {
Register boolReg = masm.extractBoolean(boolVal, ExtractTemp0);
Register int32Reg = masm.extractInt32(int32Val, ExtractTemp1);
// Compare payload regs of R0 and R1.
Assembler::Condition cond = JSOpToCondition(op_, /* signed = */true);
masm.cmp32Set(cond, (lhsIsInt32_ ? int32Reg : boolReg),
(lhsIsInt32_ ? boolReg : int32Reg), R0.scratchReg());
// Box the result and return
masm.tagValue(JSVAL_TYPE_BOOLEAN, R0.scratchReg(), R0);
EmitReturnFromIC(masm);
}
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// GetProp_Fallback
//
static bool
TryAttachMagicArgumentsGetPropStub(JSContext* cx, JSScript* script, ICGetProp_Fallback* stub,
ICStubCompiler::Engine engine, HandlePropertyName name,
HandleValue val, HandleValue res,
bool* attached)
{
MOZ_ASSERT(!*attached);
if (!val.isMagic(JS_OPTIMIZED_ARGUMENTS))
return true;
// Try handling arguments.callee on optimized arguments.
if (name == cx->names().callee) {
MOZ_ASSERT(script->hasMappedArgsObj());
JitSpew(JitSpew_BaselineIC, " Generating GetProp(MagicArgs.callee) stub");
// Unlike ICGetProp_ArgumentsLength, only magic argument stubs are
// supported at the moment.
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
ICGetProp_ArgumentsCallee::Compiler compiler(cx, engine, monitorStub);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
*attached = true;
return true;
}
return true;
}
static bool
TryAttachLengthStub(JSContext* cx, JSScript* script, ICGetProp_Fallback* stub,
ICStubCompiler::Engine engine, HandleValue val,
HandleValue res, bool* attached)
{
MOZ_ASSERT(!*attached);
if (val.isString()) {
MOZ_ASSERT(res.isInt32());
JitSpew(JitSpew_BaselineIC, " Generating GetProp(String.length) stub");
ICGetProp_StringLength::Compiler compiler(cx, engine);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
*attached = true;
stub->addNewStub(newStub);
return true;
}
if (val.isMagic(JS_OPTIMIZED_ARGUMENTS) && res.isInt32()) {
JitSpew(JitSpew_BaselineIC, " Generating GetProp(MagicArgs.length) stub");
ICGetProp_ArgumentsLength::Compiler compiler(cx, engine, ICGetProp_ArgumentsLength::Magic);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
*attached = true;
stub->addNewStub(newStub);
return true;
}
if (!val.isObject())
return true;
RootedObject obj(cx, &val.toObject());
if (obj->is<ArrayObject>() && res.isInt32()) {
JitSpew(JitSpew_BaselineIC, " Generating GetProp(Array.length) stub");
ICGetProp_ArrayLength::Compiler compiler(cx, engine);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
*attached = true;
stub->addNewStub(newStub);
return true;
}
if (obj->is<UnboxedArrayObject>() && res.isInt32()) {
JitSpew(JitSpew_BaselineIC, " Generating GetProp(UnboxedArray.length) stub");
ICGetProp_UnboxedArrayLength::Compiler compiler(cx, engine);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
*attached = true;
stub->addNewStub(newStub);
return true;
}
if (obj->is<ArgumentsObject>() && res.isInt32()) {
JitSpew(JitSpew_BaselineIC, " Generating GetProp(ArgsObj.length %s) stub",
obj->is<MappedArgumentsObject>() ? "Mapped" : "Unmapped");
ICGetProp_ArgumentsLength::Which which = ICGetProp_ArgumentsLength::Mapped;
if (obj->is<UnmappedArgumentsObject>())
which = ICGetProp_ArgumentsLength::Unmapped;
ICGetProp_ArgumentsLength::Compiler compiler(cx, engine, which);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
*attached = true;
stub->addNewStub(newStub);
return true;
}
return true;
}
static bool
UpdateExistingGenerationalDOMProxyStub(ICGetProp_Fallback* stub,
HandleObject obj)
{
Value expandoSlot = GetProxyExtra(obj, GetDOMProxyExpandoSlot());
MOZ_ASSERT(!expandoSlot.isObject() && !expandoSlot.isUndefined());
ExpandoAndGeneration* expandoAndGeneration = (ExpandoAndGeneration*)expandoSlot.toPrivate();
for (ICStubConstIterator iter = stub->beginChainConst(); !iter.atEnd(); iter++) {
if (iter->isGetProp_CallDOMProxyWithGenerationNative()) {
ICGetProp_CallDOMProxyWithGenerationNative* updateStub =
iter->toGetProp_CallDOMProxyWithGenerationNative();
if (updateStub->expandoAndGeneration() == expandoAndGeneration) {
// Update generation
uint64_t generation = expandoAndGeneration->generation;
JitSpew(JitSpew_BaselineIC,
" Updating existing stub with generation, old value: %i, "
"new value: %" PRIu64 "", updateStub->generation(),
generation);
updateStub->setGeneration(generation);
return true;
}
}
}
return false;
}
// Return whether obj is in some PreliminaryObjectArray and has a structure
// that might change in the future.
bool
IsPreliminaryObject(JSObject* obj)
{
if (obj->isSingleton())
return false;
TypeNewScript* newScript = obj->group()->newScript();
if (newScript && !newScript->analyzed())
return true;
if (obj->group()->maybePreliminaryObjects())
return true;
return false;
}
void
StripPreliminaryObjectStubs(JSContext* cx, ICFallbackStub* stub)
{
// Before the new script properties analysis has been performed on a type,
// all instances of that type have the maximum number of fixed slots.
// Afterwards, the objects (even the preliminary ones) might be changed
// to reduce the number of fixed slots they have. If we generate stubs for
// both the old and new number of fixed slots, the stub will look
// polymorphic to IonBuilder when it is actually monomorphic. To avoid
// this, strip out any stubs for preliminary objects before attaching a new
// stub which isn't on a preliminary object.
for (ICStubIterator iter = stub->beginChain(); !iter.atEnd(); iter++) {
if (iter->isGetProp_Native() && iter->toGetProp_Native()->hasPreliminaryObject())
iter.unlink(cx);
else if (iter->isSetProp_Native() && iter->toSetProp_Native()->hasPreliminaryObject())
iter.unlink(cx);
}
}
JSObject*
GetDOMProxyProto(JSObject* obj)
{
MOZ_ASSERT(IsCacheableDOMProxy(obj));
return obj->getTaggedProto().toObjectOrNull();
}
// Look up a property's shape on an object, being careful never to do any effectful
// operations. This procedure not yielding a shape should not be taken as a lack of
// existence of the property on the object.
bool
EffectlesslyLookupProperty(JSContext* cx, HandleObject obj, HandleId id,
MutableHandleObject holder, MutableHandleShape shape,
bool* checkDOMProxy,
DOMProxyShadowsResult* shadowsResult,
bool* domProxyHasGeneration)
{
shape.set(nullptr);
holder.set(nullptr);
if (checkDOMProxy) {
*checkDOMProxy = false;
*shadowsResult = ShadowCheckFailed;
}
// Check for list base if asked to.
RootedObject checkObj(cx, obj);
if (checkDOMProxy && IsCacheableDOMProxy(obj)) {
MOZ_ASSERT(domProxyHasGeneration);
MOZ_ASSERT(shadowsResult);
*checkDOMProxy = true;
if (obj->hasUncacheableProto())
return true;
*shadowsResult = GetDOMProxyShadowsCheck()(cx, obj, id);
if (*shadowsResult == ShadowCheckFailed)
return false;
if (DOMProxyIsShadowing(*shadowsResult)) {
holder.set(obj);
return true;
}
*domProxyHasGeneration = (*shadowsResult == DoesntShadowUnique);
checkObj = GetDOMProxyProto(obj);
if (!checkObj)
return true;
}
if (LookupPropertyPure(cx, checkObj, id, holder.address(), shape.address()))
return true;
holder.set(nullptr);
shape.set(nullptr);
return true;
}
bool
IsCacheableProtoChain(JSObject* obj, JSObject* holder, bool isDOMProxy)
{
MOZ_ASSERT_IF(isDOMProxy, IsCacheableDOMProxy(obj));
if (!isDOMProxy && !obj->isNative()) {
if (obj == holder)
return false;
if (!obj->is<UnboxedPlainObject>() &&
!obj->is<UnboxedArrayObject>() &&
!obj->is<TypedObject>())
{
return false;
}
}
// Don't handle objects which require a prototype guard. This should
// be uncommon so handling it is likely not worth the complexity.
if (obj->hasUncacheableProto())
return false;
JSObject* cur = obj;
while (cur != holder) {
// We cannot assume that we find the holder object on the prototype
// chain and must check for null proto. The prototype chain can be
// altered during the lookupProperty call.
JSObject* proto;
if (isDOMProxy && cur == obj)
proto = cur->getTaggedProto().toObjectOrNull();
else
proto = cur->getProto();
if (!proto || !proto->isNative())
return false;
if (proto->hasUncacheableProto())
return false;
cur = proto;
}
return true;
}
bool
IsCacheableGetPropReadSlot(JSObject* obj, JSObject* holder, Shape* shape, bool isDOMProxy)
{
if (!shape || !IsCacheableProtoChain(obj, holder, isDOMProxy))
return false;
if (!shape->hasSlot() || !shape->hasDefaultGetter())
return false;
return true;
}
void
GetFixedOrDynamicSlotOffset(Shape* shape, bool* isFixed, uint32_t* offset)
{
MOZ_ASSERT(isFixed);
MOZ_ASSERT(offset);
*isFixed = shape->slot() < shape->numFixedSlots();
*offset = *isFixed ? NativeObject::getFixedSlotOffset(shape->slot())
: (shape->slot() - shape->numFixedSlots()) * sizeof(Value);
}
static bool
TryAttachNativeGetValuePropStub(JSContext* cx, HandleScript script, jsbytecode* pc,
ICGetProp_Fallback* stub, ICStubCompiler::Engine engine,
HandlePropertyName name,
HandleValue val, HandleShape oldShape,
HandleValue res, bool* attached)
{
MOZ_ASSERT(!*attached);
if (!val.isObject())
return true;
RootedObject obj(cx, &val.toObject());
if (obj->isNative() && oldShape != obj->as<NativeObject>().lastProperty()) {
// No point attaching anything, since we know the shape guard will fail
return true;
}
RootedShape shape(cx);
RootedObject holder(cx);
RootedId id(cx, NameToId(name));
if (!EffectlesslyLookupProperty(cx, obj, id, &holder, &shape))
return false;
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
if (IsCacheableGetPropReadSlot(obj, holder, shape)) {
bool isFixedSlot;
uint32_t offset;
GetFixedOrDynamicSlotOffset(shape, &isFixedSlot, &offset);
// Instantiate this property for singleton holders, for use during Ion compilation.
if (IsIonEnabled(cx))
EnsureTrackPropertyTypes(cx, holder, NameToId(name));
ICStub::Kind kind =
(obj == holder) ? ICStub::GetProp_Native : ICStub::GetProp_NativePrototype;
JitSpew(JitSpew_BaselineIC, " Generating GetProp(Native %s) stub",
(obj == holder) ? "direct" : "prototype");
ICGetPropNativeCompiler compiler(cx, kind, engine, monitorStub, obj, holder,
name, isFixedSlot, offset);
ICGetPropNativeStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
if (IsPreliminaryObject(obj))
newStub->notePreliminaryObject();
else
StripPreliminaryObjectStubs(cx, stub);
stub->addNewStub(newStub);
*attached = true;
return true;
}
return true;
}
bool
IsCacheableGetPropCall(JSContext* cx, JSObject* obj, JSObject* holder, Shape* shape,
bool* isScripted, bool* isTemporarilyUnoptimizable, bool isDOMProxy)
{
MOZ_ASSERT(isScripted);
if (!shape || !IsCacheableProtoChain(obj, holder, isDOMProxy))
return false;
if (shape->hasSlot() || shape->hasDefaultGetter())
return false;
if (!shape->hasGetterValue())
return false;
if (!shape->getterValue().isObject() || !shape->getterObject()->is<JSFunction>())
return false;
JSFunction* func = &shape->getterObject()->as<JSFunction>();
if (func->isNative()) {
*isScripted = false;
return true;
}
if (!func->hasJITCode()) {
*isTemporarilyUnoptimizable = true;
return false;
}
*isScripted = true;
return true;
}
// Try to update all existing GetProp/GetName getter call stubs that match the
// given holder in place with a new shape and getter. fallbackStub can be
// either an ICGetProp_Fallback or an ICGetName_Fallback.
//
// If 'getter' is an own property, holder == receiver must be true.
bool
UpdateExistingGetPropCallStubs(ICFallbackStub* fallbackStub,
ICStub::Kind kind,
HandleNativeObject holder,
HandleObject receiver,
HandleFunction getter)
{
MOZ_ASSERT(kind == ICStub::GetProp_CallScripted ||
kind == ICStub::GetProp_CallNative ||
kind == ICStub::GetProp_CallNativeGlobal);
MOZ_ASSERT(fallbackStub->isGetName_Fallback() ||
fallbackStub->isGetProp_Fallback());
MOZ_ASSERT(holder);
MOZ_ASSERT(receiver);
bool isOwnGetter = (holder == receiver);
bool foundMatchingStub = false;
ReceiverGuard receiverGuard(receiver);
for (ICStubConstIterator iter = fallbackStub->beginChainConst(); !iter.atEnd(); iter++) {
if (iter->kind() == kind) {
ICGetPropCallGetter* getPropStub = static_cast<ICGetPropCallGetter*>(*iter);
if (getPropStub->holder() == holder && getPropStub->isOwnGetter() == isOwnGetter) {
// If this is an own getter, update the receiver guard as well,
// since that's the shape we'll be guarding on. Furthermore,
// isOwnGetter() relies on holderShape_ and receiverGuard_ being
// the same shape.
if (isOwnGetter)
getPropStub->receiverGuard().update(receiverGuard);
MOZ_ASSERT(getPropStub->holderShape() != holder->lastProperty() ||
!getPropStub->receiverGuard().matches(receiverGuard) ||
getPropStub->toGetProp_CallNativeGlobal()->globalShape() !=
receiver->as<ClonedBlockObject>().global().lastProperty(),
"Why didn't we end up using this stub?");
// We want to update the holder shape to match the new one no
// matter what, even if the receiver shape is different.
getPropStub->holderShape() = holder->lastProperty();
// Make sure to update the getter, since a shape change might
// have changed which getter we want to use.
getPropStub->getter() = getter;
if (getPropStub->isGetProp_CallNativeGlobal()) {
ICGetProp_CallNativeGlobal* globalStub =
getPropStub->toGetProp_CallNativeGlobal();
globalStub->globalShape() =
receiver->as<ClonedBlockObject>().global().lastProperty();
}
if (getPropStub->receiverGuard().matches(receiverGuard))
foundMatchingStub = true;
}
}
}
return foundMatchingStub;
}
static bool
TryAttachNativeGetAccessorPropStub(JSContext* cx, HandleScript script, jsbytecode* pc,
ICGetProp_Fallback* stub, ICStubCompiler::Engine engine,
HandlePropertyName name, HandleValue val, HandleValue res,
bool* attached, bool* isTemporarilyUnoptimizable)
{
MOZ_ASSERT(!*attached);
MOZ_ASSERT(!*isTemporarilyUnoptimizable);
if (!val.isObject())
return true;
RootedObject obj(cx, &val.toObject());
bool isDOMProxy;
bool domProxyHasGeneration;
DOMProxyShadowsResult domProxyShadowsResult;
RootedShape shape(cx);
RootedObject holder(cx);
RootedId id(cx, NameToId(name));
if (!EffectlesslyLookupProperty(cx, obj, id, &holder, &shape, &isDOMProxy,
&domProxyShadowsResult, &domProxyHasGeneration))
{
return false;
}
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
bool isScripted = false;
bool cacheableCall = IsCacheableGetPropCall(cx, obj, holder, shape, &isScripted,
isTemporarilyUnoptimizable);
// Try handling scripted getters.
if (cacheableCall && isScripted && !isDOMProxy && engine == ICStubCompiler::Engine::Baseline) {
RootedFunction callee(cx, &shape->getterObject()->as<JSFunction>());
MOZ_ASSERT(callee->hasScript());
if (UpdateExistingGetPropCallStubs(stub, ICStub::GetProp_CallScripted,
holder.as<NativeObject>(), obj, callee)) {
*attached = true;
return true;
}
JitSpew(JitSpew_BaselineIC, " Generating GetProp(NativeObj/ScriptedGetter %s:%" PRIuSIZE ") stub",
callee->nonLazyScript()->filename(), callee->nonLazyScript()->lineno());
ICGetProp_CallScripted::Compiler compiler(cx, monitorStub, obj, holder, callee,
script->pcToOffset(pc));
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
*attached = true;
return true;
}
// If it's a shadowed listbase proxy property, attach stub to call Proxy::get instead.
if (isDOMProxy && DOMProxyIsShadowing(domProxyShadowsResult)) {
MOZ_ASSERT(obj == holder);
JitSpew(JitSpew_BaselineIC, " Generating GetProp(DOMProxyProxy) stub");
Rooted<ProxyObject*> proxy(cx, &obj->as<ProxyObject>());
ICGetProp_DOMProxyShadowed::Compiler compiler(cx, engine, monitorStub, proxy, name,
script->pcToOffset(pc));
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
*attached = true;
return true;
}
const Class* outerClass = nullptr;
if (!isDOMProxy && !obj->isNative()) {
outerClass = obj->getClass();
if (!IsWindowProxy(obj))
return true;
// This must be a WindowProxy for the current Window/global. Else it'd
// be a cross-compartment wrapper and IsWindowProxy returns false for
// those.
MOZ_ASSERT(ToWindowIfWindowProxy(obj) == cx->global());
obj = cx->global();
if (!EffectlesslyLookupProperty(cx, obj, id, &holder, &shape, &isDOMProxy,
&domProxyShadowsResult, &domProxyHasGeneration))
{
return false;
}
cacheableCall = IsCacheableGetPropCall(cx, obj, holder, shape, &isScripted,
isTemporarilyUnoptimizable, isDOMProxy);
}
// Try handling JSNative getters.
if (!cacheableCall || isScripted)
return true;
if (!shape || !shape->hasGetterValue() || !shape->getterValue().isObject() ||
!shape->getterObject()->is<JSFunction>())
{
return true;
}
RootedFunction callee(cx, &shape->getterObject()->as<JSFunction>());
MOZ_ASSERT(callee->isNative());
if (outerClass && (!callee->jitInfo() || callee->jitInfo()->needsOuterizedThisObject()))
return true;
JitSpew(JitSpew_BaselineIC, " Generating GetProp(%s%s/NativeGetter %p) stub",
isDOMProxy ? "DOMProxyObj" : "NativeObj",
isDOMProxy && domProxyHasGeneration ? "WithGeneration" : "",
callee->native());
ICStub* newStub = nullptr;
if (isDOMProxy) {
MOZ_ASSERT(obj != holder);
ICStub::Kind kind;
if (domProxyHasGeneration) {
if (UpdateExistingGenerationalDOMProxyStub(stub, obj)) {
*attached = true;
return true;
}
kind = ICStub::GetProp_CallDOMProxyWithGenerationNative;
} else {
kind = ICStub::GetProp_CallDOMProxyNative;
}
Rooted<ProxyObject*> proxy(cx, &obj->as<ProxyObject>());
ICGetPropCallDOMProxyNativeCompiler compiler(cx, kind, engine, monitorStub, proxy, holder,
callee, script->pcToOffset(pc));
newStub = compiler.getStub(compiler.getStubSpace(script));
} else {
if (UpdateExistingGetPropCallStubs(stub, ICStub::GetProp_CallNative,
holder.as<NativeObject>(), obj, callee))
{
*attached = true;
return true;
}
ICGetPropCallNativeCompiler compiler(cx, ICStub::GetProp_CallNative, engine,
monitorStub, obj, holder, callee,
script->pcToOffset(pc), outerClass);
newStub = compiler.getStub(compiler.getStubSpace(script));
}
if (!newStub)
return false;
stub->addNewStub(newStub);
*attached = true;
return true;
}
static bool
TryAttachUnboxedGetPropStub(JSContext* cx, HandleScript script, ICGetProp_Fallback* stub,
ICStubCompiler::Engine engine, HandlePropertyName name,
HandleValue val, bool* attached)
{
MOZ_ASSERT(!*attached);
if (!cx->runtime()->jitSupportsFloatingPoint)
return true;
if (!val.isObject() || !val.toObject().is<UnboxedPlainObject>())
return true;
Rooted<UnboxedPlainObject*> obj(cx, &val.toObject().as<UnboxedPlainObject>());
const UnboxedLayout::Property* property = obj->layout().lookup(name);
if (!property)
return true;
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
ICGetProp_Unboxed::Compiler compiler(cx, engine, monitorStub, obj->group(),
property->offset + UnboxedPlainObject::offsetOfData(),
property->type);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
StripPreliminaryObjectStubs(cx, stub);
*attached = true;
return true;
}
static bool
TryAttachUnboxedExpandoGetPropStub(JSContext* cx, HandleScript script, jsbytecode* pc,
ICGetProp_Fallback* stub, ICStubCompiler::Engine engine,
HandlePropertyName name, HandleValue val,
bool* attached)
{
MOZ_ASSERT(!*attached);
if (!val.isObject() || !val.toObject().is<UnboxedPlainObject>())
return true;
Rooted<UnboxedPlainObject*> obj(cx, &val.toObject().as<UnboxedPlainObject>());
Rooted<UnboxedExpandoObject*> expando(cx, obj->maybeExpando());
if (!expando)
return true;
Shape* shape = expando->lookup(cx, name);
if (!shape || !shape->hasDefaultGetter() || !shape->hasSlot())
return true;
bool isFixedSlot;
uint32_t offset;
GetFixedOrDynamicSlotOffset(shape, &isFixedSlot, &offset);
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
ICGetPropNativeCompiler compiler(cx, ICStub::GetProp_Native, engine, monitorStub, obj, obj,
name, isFixedSlot, offset);
ICGetPropNativeStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
StripPreliminaryObjectStubs(cx, stub);
stub->addNewStub(newStub);
*attached = true;
return true;
}
static bool
TryAttachTypedObjectGetPropStub(JSContext* cx, HandleScript script, ICGetProp_Fallback* stub,
ICStubCompiler::Engine engine, HandlePropertyName name,
HandleValue val, bool* attached)
{
MOZ_ASSERT(!*attached);
if (!cx->runtime()->jitSupportsFloatingPoint)
return true;
if (!val.isObject() || !val.toObject().is<TypedObject>())
return true;
Rooted<TypedObject*> obj(cx, &val.toObject().as<TypedObject>());
if (!obj->typeDescr().is<StructTypeDescr>())
return true;
Rooted<StructTypeDescr*> structDescr(cx, &obj->typeDescr().as<StructTypeDescr>());
size_t fieldIndex;
if (!structDescr->fieldIndex(NameToId(name), &fieldIndex))
return true;
Rooted<TypeDescr*> fieldDescr(cx, &structDescr->fieldDescr(fieldIndex));
if (!fieldDescr->is<SimpleTypeDescr>())
return true;
uint32_t fieldOffset = structDescr->fieldOffset(fieldIndex);
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
ICGetProp_TypedObject::Compiler compiler(cx, engine, monitorStub, obj->maybeShape(),
fieldOffset, &fieldDescr->as<SimpleTypeDescr>());
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
*attached = true;
return true;
}
static bool
TryAttachModuleNamespaceGetPropStub(JSContext* cx, HandleScript script, ICGetProp_Fallback* stub,
ICStubCompiler::Engine engine, HandlePropertyName name,
HandleValue val, bool* attached)
{
MOZ_ASSERT(!*attached);
if (!ModuleNamespaceObject::isInstance(val))
return true;
Rooted<ModuleNamespaceObject*> ns(cx, &val.toObject().as<ModuleNamespaceObject>());
RootedModuleEnvironmentObject env(cx);
RootedShape shape(cx);
if (!ns->bindings().lookup(NameToId(name), env.address(), shape.address()))
return true;
// Don't emit a stub until the target binding has been initialized.
if (env->getSlot(shape->slot()).isMagic(JS_UNINITIALIZED_LEXICAL))
return true;
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
bool isFixedSlot;
uint32_t offset;
GetFixedOrDynamicSlotOffset(shape, &isFixedSlot, &offset);
// Instantiate this property for singleton holders, for use during Ion compilation.
if (IsIonEnabled(cx))
EnsureTrackPropertyTypes(cx, env, shape->propid());
ICGetProp_ModuleNamespace::Compiler compiler(cx, engine, monitorStub,
ns, env, isFixedSlot, offset);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
*attached = true;
return true;
}
static bool
TryAttachPrimitiveGetPropStub(JSContext* cx, HandleScript script, jsbytecode* pc,
ICGetProp_Fallback* stub, ICStubCompiler::Engine engine,
HandlePropertyName name, HandleValue val,
HandleValue res, bool* attached)
{
MOZ_ASSERT(!*attached);
JSValueType primitiveType;
RootedNativeObject proto(cx);
Rooted<GlobalObject*> global(cx, &script->global());
if (val.isString()) {
primitiveType = JSVAL_TYPE_STRING;
proto = GlobalObject::getOrCreateStringPrototype(cx, global);
} else if (val.isSymbol()) {
primitiveType = JSVAL_TYPE_SYMBOL;
proto = GlobalObject::getOrCreateSymbolPrototype(cx, global);
} else if (val.isNumber()) {
primitiveType = JSVAL_TYPE_DOUBLE;
proto = GlobalObject::getOrCreateNumberPrototype(cx, global);
} else {
MOZ_ASSERT(val.isBoolean());
primitiveType = JSVAL_TYPE_BOOLEAN;
proto = GlobalObject::getOrCreateBooleanPrototype(cx, global);
}
if (!proto)
return false;
// Instantiate this property, for use during Ion compilation.
RootedId id(cx, NameToId(name));
if (IsIonEnabled(cx))
EnsureTrackPropertyTypes(cx, proto, id);
// For now, only look for properties directly set on the prototype.
RootedShape shape(cx, proto->lookup(cx, id));
if (!shape || !shape->hasSlot() || !shape->hasDefaultGetter())
return true;
bool isFixedSlot;
uint32_t offset;
GetFixedOrDynamicSlotOffset(shape, &isFixedSlot, &offset);
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
JitSpew(JitSpew_BaselineIC, " Generating GetProp_Primitive stub");
ICGetProp_Primitive::Compiler compiler(cx, engine, monitorStub, primitiveType, proto,
isFixedSlot, offset);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
*attached = true;
return true;
}
bool
CheckHasNoSuchProperty(JSContext* cx, HandleObject obj, HandlePropertyName name,
MutableHandleObject lastProto, size_t* protoChainDepthOut)
{
MOZ_ASSERT(protoChainDepthOut != nullptr);
size_t depth = 0;
RootedObject curObj(cx, obj);
while (curObj) {
if (curObj->isNative()) {
// Don't handle proto chains with resolve hooks.
if (ClassMayResolveId(cx->names(), curObj->getClass(), NameToId(name), curObj))
return false;
if (curObj->as<NativeObject>().contains(cx, NameToId(name)))
return false;
} else if (curObj != obj) {
// Non-native objects are only handled as the original receiver.
return false;
} else if (curObj->is<UnboxedPlainObject>()) {
if (curObj->as<UnboxedPlainObject>().containsUnboxedOrExpandoProperty(cx, NameToId(name)))
return false;
} else if (curObj->is<UnboxedArrayObject>()) {
if (name == cx->names().length)
return false;
} else if (curObj->is<TypedObject>()) {
if (curObj->as<TypedObject>().typeDescr().hasProperty(cx->names(), NameToId(name)))
return false;
} else {
return false;
}
JSObject* proto = curObj->getTaggedProto().toObjectOrNull();
if (!proto)
break;
curObj = proto;
depth++;
}
lastProto.set(curObj);
*protoChainDepthOut = depth;
return true;
}
static bool
TryAttachNativeGetPropDoesNotExistStub(JSContext* cx, HandleScript script,
jsbytecode* pc, ICGetProp_Fallback* stub,
ICStubCompiler::Engine engine,
HandlePropertyName name, HandleValue val,
bool* attached)
{
MOZ_ASSERT(!*attached);
if (!val.isObject())
return true;
RootedObject obj(cx, &val.toObject());
// Don't attach stubs for CALLPROP since those need NoSuchMethod handling.
if (JSOp(*pc) == JSOP_CALLPROP)
return true;
// Check if does-not-exist can be confirmed on property.
RootedObject lastProto(cx);
size_t protoChainDepth = SIZE_MAX;
if (!CheckHasNoSuchProperty(cx, obj, name, &lastProto, &protoChainDepth))
return true;
MOZ_ASSERT(protoChainDepth < SIZE_MAX);
if (protoChainDepth > ICGetProp_NativeDoesNotExist::MAX_PROTO_CHAIN_DEPTH)
return true;
ICStub* monitorStub = stub->fallbackMonitorStub()->firstMonitorStub();
// Confirmed no-such-property. Add stub.
JitSpew(JitSpew_BaselineIC, " Generating GetProp_NativeDoesNotExist stub");
ICGetPropNativeDoesNotExistCompiler compiler(cx, engine, monitorStub, obj, protoChainDepth);
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
*attached = true;
return true;
}
static bool
ComputeGetPropResult(JSContext* cx, BaselineFrame* frame, JSOp op, HandlePropertyName name,
MutableHandleValue val, MutableHandleValue res)
{
// Handle arguments.length and arguments.callee on optimized arguments, as
// it is not an object.
if (frame && val.isMagic(JS_OPTIMIZED_ARGUMENTS) && IsOptimizedArguments(frame, val)) {
if (op == JSOP_LENGTH) {
res.setInt32(frame->numActualArgs());
} else {
MOZ_ASSERT(name == cx->names().callee);
MOZ_ASSERT(frame->script()->hasMappedArgsObj());
res.setObject(*frame->callee());
}
} else {
if (op == JSOP_GETXPROP) {
RootedObject obj(cx, &val.toObject());
RootedId id(cx, NameToId(name));
if (!GetPropertyForNameLookup(cx, obj, id, res))
return false;
} else {
MOZ_ASSERT(op == JSOP_GETPROP || op == JSOP_CALLPROP || op == JSOP_LENGTH);
if (!GetProperty(cx, val, name, res))
return false;
}
}
return true;
}
static bool
DoGetPropFallback(JSContext* cx, BaselineFrame* frame, ICGetProp_Fallback* stub_,
MutableHandleValue val, MutableHandleValue res)
{
ICStubCompiler::Engine engine = SharedStubEngine(frame);
RootedScript script(cx, SharedStubScript(frame, stub_));
// This fallback stub may trigger debug mode toggling.
DebugModeOSRVolatileStub<ICGetProp_Fallback*> stub(engine, frame, stub_);
jsbytecode* pc = stub->icEntry()->pc(script);
JSOp op = JSOp(*pc);
FallbackICSpew(cx, stub, "GetProp(%s)", CodeName[op]);
MOZ_ASSERT(op == JSOP_GETPROP || op == JSOP_CALLPROP || op == JSOP_LENGTH || op == JSOP_GETXPROP);
// Grab our old shape before it goes away.
RootedShape oldShape(cx);
if (val.isObject())
oldShape = val.toObject().maybeShape();
bool attached = false;
// There are some reasons we can fail to attach a stub that are temporary.
// We want to avoid calling noteUnoptimizableAccess() if the reason we
// failed to attach a stub is one of those temporary reasons, since we might
// end up attaching a stub for the exact same access later.
bool isTemporarilyUnoptimizable = false;
RootedPropertyName name(cx, script->getName(pc));
// After the Genericstub was added, we should never reach the Fallbackstub again.
MOZ_ASSERT(!stub->hasStub(ICStub::GetProp_Generic));
if (stub->numOptimizedStubs() >= ICGetProp_Fallback::MAX_OPTIMIZED_STUBS) {
// Discard all stubs in this IC and replace with generic getprop stub.
for(ICStubIterator iter = stub->beginChain(); !iter.atEnd(); iter++)
iter.unlink(cx);
ICGetProp_Generic::Compiler compiler(cx, engine,
stub->fallbackMonitorStub()->firstMonitorStub());
ICStub* newStub = compiler.getStub(compiler.getStubSpace(script));
if (!newStub)
return false;
stub->addNewStub(newStub);
attached = true;
}
if (!attached && !TryAttachNativeGetAccessorPropStub(cx, script, pc, stub, engine, name, val,
res, &attached,
&isTemporarilyUnoptimizable))
{
return false;
}
if (!ComputeGetPropResult(cx, frame, op, name, val, res))
return false;
TypeScript::Monitor(cx, script, pc, res);
// Check if debug mode toggling made the stub invalid.
if (stub.invalid())
return true;
// Add a type monitor stub for the resulting value.
if (!stub->addMonitorStubForValue(cx, script, res, engine))
return false;
if (attached)
return true;
if (op == JSOP_LENGTH) {
if (!TryAttachLengthStub(cx, script, stub, engine, val, res, &attached))
return false;
if (attached)
return true;
}
if (!TryAttachMagicArgumentsGetPropStub(cx, script, stub, engine, name, val, res, &attached))
return false;
if (attached)
return true;
if (!TryAttachNativeGetValuePropStub(cx, script, pc, stub, engine, name, val, oldShape,
res, &attached))
return false;
if (attached)
return true;
if (!TryAttachUnboxedGetPropStub(cx, script, stub, engine, name, val, &attached))
return false;
if (attached)
return true;
if (!TryAttachUnboxedExpandoGetPropStub(cx, script, pc, stub, engine, name, val, &attached))
return false;
if (attached)
return true;
if (!TryAttachTypedObjectGetPropStub(cx, script, stub, engine, name, val, &attached))
return false;
if (attached)
return true;
if (!TryAttachModuleNamespaceGetPropStub(cx, script, stub, engine, name, val, &attached))
return false;
if (attached)
return true;
if (val.isString() || val.isNumber() || val.isBoolean()) {
if (!TryAttachPrimitiveGetPropStub(cx, script, pc, stub, engine, name, val, res, &attached))
return false;
if (attached)
return true;
}
if (res.isUndefined()) {
// Try attaching property-not-found optimized stub for undefined results.
if (!TryAttachNativeGetPropDoesNotExistStub(cx, script, pc, stub, engine, name, val,
&attached))
{
return false;
}
if (attached)
return true;
}
MOZ_ASSERT(!attached);
if (!isTemporarilyUnoptimizable)
stub->noteUnoptimizableAccess();
return true;
}
typedef bool (*DoGetPropFallbackFn)(JSContext*, BaselineFrame*, ICGetProp_Fallback*,
MutableHandleValue, MutableHandleValue);
static const VMFunction DoGetPropFallbackInfo =
FunctionInfo<DoGetPropFallbackFn>(DoGetPropFallback, TailCall, PopValues(1));
bool
ICGetProp_Fallback::Compiler::generateStubCode(MacroAssembler& masm)
{
MOZ_ASSERT(R0 == JSReturnOperand);
EmitRestoreTailCallReg(masm);
// Ensure stack is fully synced for the expression decompiler.
masm.pushValue(R0);
// Push arguments.
masm.pushValue(R0);
masm.push(ICStubReg);
pushFramePtr(masm, R0.scratchReg());
if (!tailCallVM(DoGetPropFallbackInfo, masm))
return false;
// Even though the fallback frame doesn't enter a stub frame, the CallScripted
// frame that we are emulating does. Again, we lie.
#ifdef DEBUG
EmitRepushTailCallReg(masm);
enterStubFrame(masm, R0.scratchReg());
#else
inStubFrame_ = true;
#endif
// What follows is bailout for inlined scripted getters.
// The return address pointed to by the baseline stack points here.
returnOffset_ = masm.currentOffset();
leaveStubFrame(masm, true);
// When we get here, ICStubReg contains the ICGetProp_Fallback stub,
// which we can't use to enter the TypeMonitor IC, because it's a MonitoredFallbackStub
// instead of a MonitoredStub. So, we cheat.
masm.loadPtr(Address(ICStubReg, ICMonitoredFallbackStub::offsetOfFallbackMonitorStub()),
ICStubReg);
EmitEnterTypeMonitorIC(masm, ICTypeMonitor_Fallback::offsetOfFirstMonitorStub());
return true;
}
void
ICGetProp_Fallback::Compiler::postGenerateStubCode(MacroAssembler& masm, Handle<JitCode*> code)
{
if (engine_ == Engine::Baseline) {
void* address = code->raw() + returnOffset_;
cx->compartment()->jitCompartment()->initBaselineGetPropReturnAddr(address);
}
}
bool
ICGetProp_ArrayLength::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
Register scratch = R1.scratchReg();
// Unbox R0 and guard it's an array.
Register obj = masm.extractObject(R0, ExtractTemp0);
masm.branchTestObjClass(Assembler::NotEqual, obj, scratch, &ArrayObject::class_, &failure);
// Load obj->elements->length.
masm.loadPtr(Address(obj, NativeObject::offsetOfElements()), scratch);
masm.load32(Address(scratch, ObjectElements::offsetOfLength()), scratch);
// Guard length fits in an int32.
masm.branchTest32(Assembler::Signed, scratch, scratch, &failure);
masm.tagValue(JSVAL_TYPE_INT32, scratch, R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICGetProp_UnboxedArrayLength::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
Register scratch = R1.scratchReg();
// Unbox R0 and guard it's an unboxed array.
Register obj = masm.extractObject(R0, ExtractTemp0);
masm.branchTestObjClass(Assembler::NotEqual, obj, scratch, &UnboxedArrayObject::class_, &failure);
// Load obj->length.
masm.load32(Address(obj, UnboxedArrayObject::offsetOfLength()), scratch);
masm.tagValue(JSVAL_TYPE_INT32, scratch, R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICGetProp_StringLength::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestString(Assembler::NotEqual, R0, &failure);
// Unbox string and load its length.
Register string = masm.extractString(R0, ExtractTemp0);
masm.loadStringLength(string, string);
masm.tagValue(JSVAL_TYPE_INT32, string, R0);
EmitReturnFromIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICGetProp_Primitive::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
switch (primitiveType_) {
case JSVAL_TYPE_STRING:
masm.branchTestString(Assembler::NotEqual, R0, &failure);
break;
case JSVAL_TYPE_SYMBOL:
masm.branchTestSymbol(Assembler::NotEqual, R0, &failure);
break;
case JSVAL_TYPE_DOUBLE: // Also used for int32.
masm.branchTestNumber(Assembler::NotEqual, R0, &failure);
break;
case JSVAL_TYPE_BOOLEAN:
masm.branchTestBoolean(Assembler::NotEqual, R0, &failure);
break;
default:
MOZ_CRASH("unexpected type");
}
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register holderReg = regs.takeAny();
Register scratchReg = regs.takeAny();
// Verify the shape of the prototype.
masm.movePtr(ImmGCPtr(prototype_.get()), holderReg);
Address shapeAddr(ICStubReg, ICGetProp_Primitive::offsetOfProtoShape());
masm.loadPtr(Address(holderReg, JSObject::offsetOfShape()), scratchReg);
masm.branchPtr(Assembler::NotEqual, shapeAddr, scratchReg, &failure);
if (!isFixedSlot_)
masm.loadPtr(Address(holderReg, NativeObject::offsetOfSlots()), holderReg);
masm.load32(Address(ICStubReg, ICGetProp_Primitive::offsetOfOffset()), scratchReg);
masm.loadValue(BaseIndex(holderReg, scratchReg, TimesOne), R0);
// Enter type monitor IC to type-check result.
EmitEnterTypeMonitorIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
ICGetPropNativeStub*
ICGetPropNativeCompiler::getStub(ICStubSpace* space)
{
ReceiverGuard guard(obj_);
switch (kind) {
case ICStub::GetProp_Native: {
MOZ_ASSERT(obj_ == holder_);
return newStub<ICGetProp_Native>(space, getStubCode(), firstMonitorStub_, guard, offset_);
}
case ICStub::GetProp_NativePrototype: {
MOZ_ASSERT(obj_ != holder_);
Shape* holderShape = holder_->as<NativeObject>().lastProperty();
return newStub<ICGetProp_NativePrototype>(space, getStubCode(), firstMonitorStub_, guard,
offset_, holder_, holderShape);
}
case ICStub::GetName_Global: {
MOZ_ASSERT(obj_ != holder_);
Shape* holderShape = holder_->as<NativeObject>().lastProperty();
Shape* globalShape = obj_->as<ClonedBlockObject>().global().lastProperty();
return newStub<ICGetName_Global>(space, getStubCode(), firstMonitorStub_, guard,
offset_, holder_, holderShape, globalShape);
}
default:
MOZ_CRASH("Bad stub kind");
}
}
void
GuardReceiverObject(MacroAssembler& masm, ReceiverGuard guard,
Register object, Register scratch,
size_t receiverGuardOffset, Label* failure)
{
Address groupAddress(ICStubReg, receiverGuardOffset + HeapReceiverGuard::offsetOfGroup());
Address shapeAddress(ICStubReg, receiverGuardOffset + HeapReceiverGuard::offsetOfShape());
Address expandoAddress(object, UnboxedPlainObject::offsetOfExpando());
if (guard.group) {
masm.loadPtr(groupAddress, scratch);
masm.branchTestObjGroup(Assembler::NotEqual, object, scratch, failure);
if (guard.group->clasp() == &UnboxedPlainObject::class_ && !guard.shape) {
// Guard the unboxed object has no expando object.
masm.branchPtr(Assembler::NotEqual, expandoAddress, ImmWord(0), failure);
}
}
if (guard.shape) {
masm.loadPtr(shapeAddress, scratch);
if (guard.group && guard.group->clasp() == &UnboxedPlainObject::class_) {
// Guard the unboxed object has a matching expando object.
masm.branchPtr(Assembler::Equal, expandoAddress, ImmWord(0), failure);
Label done;
masm.push(object);
masm.loadPtr(expandoAddress, object);
masm.branchTestObjShape(Assembler::Equal, object, scratch, &done);
masm.pop(object);
masm.jump(failure);
masm.bind(&done);
masm.pop(object);
} else {
masm.branchTestObjShape(Assembler::NotEqual, object, scratch, failure);
}
}
}
static void
GuardGlobalObject(MacroAssembler& masm, HandleObject holder, Register globalLexicalReg,
Register holderReg, Register scratch, size_t globalShapeOffset, Label* failure)
{
if (holder->is<GlobalObject>())
return;
masm.extractObject(Address(globalLexicalReg, ScopeObject::offsetOfEnclosingScope()),
holderReg);
masm.loadPtr(Address(ICStubReg, globalShapeOffset), scratch);
masm.branchTestObjShape(Assembler::NotEqual, holderReg, scratch, failure);
}
bool
ICGetPropNativeCompiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
AllocatableGeneralRegisterSet regs(availableGeneralRegs(0));
Register objReg = InvalidReg;
if (inputDefinitelyObject_) {
objReg = R0.scratchReg();
} else {
regs.take(R0);
// Guard input is an object and unbox.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
objReg = masm.extractObject(R0, ExtractTemp0);
}
regs.takeUnchecked(objReg);
Register scratch = regs.takeAnyExcluding(ICTailCallReg);
// Shape/group guard.
GuardReceiverObject(masm, ReceiverGuard(obj_), objReg, scratch,
ICGetPropNativeStub::offsetOfReceiverGuard(), &failure);
Register holderReg;
if (obj_ == holder_) {
MOZ_ASSERT(kind != ICStub::GetName_Global);
if (obj_->is<UnboxedPlainObject>()) {
// We are loading off the expando object, so use that for the holder.
holderReg = regs.takeAny();
masm.loadPtr(Address(objReg, UnboxedPlainObject::offsetOfExpando()), holderReg);
} else {
holderReg = objReg;
}
} else {
holderReg = regs.takeAny();
// If we are generating a non-lexical GETGNAME stub, we must also
// guard on the shape of the GlobalObject.
if (kind == ICStub::GetName_Global) {
MOZ_ASSERT(obj_->is<ClonedBlockObject>() && obj_->as<ClonedBlockObject>().isGlobal());
GuardGlobalObject(masm, holder_, objReg, holderReg, scratch,
ICGetName_Global::offsetOfGlobalShape(), &failure);
}
// Shape guard holder.
masm.loadPtr(Address(ICStubReg, ICGetProp_NativePrototype::offsetOfHolder()),
holderReg);
masm.loadPtr(Address(ICStubReg, ICGetProp_NativePrototype::offsetOfHolderShape()),
scratch);
masm.branchTestObjShape(Assembler::NotEqual, holderReg, scratch, &failure);
}
if (!isFixedSlot_) {
// Don't overwrite actual holderReg if we need to load a dynamic slots object.
// May need to preserve object for noSuchMethod check later.
Register nextHolder = regs.takeAny();
masm.loadPtr(Address(holderReg, NativeObject::offsetOfSlots()), nextHolder);
holderReg = nextHolder;
}
masm.load32(Address(ICStubReg, ICGetPropNativeStub::offsetOfOffset()), scratch);
BaseIndex result(holderReg, scratch, TimesOne);
masm.loadValue(result, R0);
// Enter type monitor IC to type-check result.
EmitEnterTypeMonitorIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
GetProtoShapes(JSObject* obj, size_t protoChainDepth, MutableHandle<ShapeVector> shapes)
{
JSObject* curProto = obj->getProto();
for (size_t i = 0; i < protoChainDepth; i++) {
if (!shapes.append(curProto->as<NativeObject>().lastProperty()))
return false;
curProto = curProto->getProto();
}
MOZ_ASSERT(!curProto);
return true;
}
ICStub*
ICGetPropNativeDoesNotExistCompiler::getStub(ICStubSpace* space)
{
Rooted<ShapeVector> shapes(cx, ShapeVector(cx));
if (!GetProtoShapes(obj_, protoChainDepth_, &shapes))
return nullptr;
JS_STATIC_ASSERT(ICGetProp_NativeDoesNotExist::MAX_PROTO_CHAIN_DEPTH == 8);
ICStub* stub = nullptr;
switch(protoChainDepth_) {
case 0: stub = getStubSpecific<0>(space, shapes); break;
case 1: stub = getStubSpecific<1>(space, shapes); break;
case 2: stub = getStubSpecific<2>(space, shapes); break;
case 3: stub = getStubSpecific<3>(space, shapes); break;
case 4: stub = getStubSpecific<4>(space, shapes); break;
case 5: stub = getStubSpecific<5>(space, shapes); break;
case 6: stub = getStubSpecific<6>(space, shapes); break;
case 7: stub = getStubSpecific<7>(space, shapes); break;
case 8: stub = getStubSpecific<8>(space, shapes); break;
default: MOZ_CRASH("ProtoChainDepth too high.");
}
if (!stub)
return nullptr;
return stub;
}
bool
ICGetPropNativeDoesNotExistCompiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register scratch = regs.takeAny();
#ifdef DEBUG
// Ensure that protoChainDepth_ matches the protoChainDepth stored on the stub.
{
Label ok;
masm.load16ZeroExtend(Address(ICStubReg, ICStub::offsetOfExtra()), scratch);
masm.branch32(Assembler::Equal, scratch, Imm32(protoChainDepth_), &ok);
masm.assumeUnreachable("Non-matching proto chain depth on stub.");
masm.bind(&ok);
}
#endif // DEBUG
// Guard input is an object.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
// Unbox and guard against old shape/group.
Register objReg = masm.extractObject(R0, ExtractTemp0);
GuardReceiverObject(masm, ReceiverGuard(obj_), objReg, scratch,
ICGetProp_NativeDoesNotExist::offsetOfGuard(), &failure);
Register protoReg = regs.takeAny();
// Check the proto chain.
for (size_t i = 0; i < protoChainDepth_; i++) {
masm.loadObjProto(i == 0 ? objReg : protoReg, protoReg);
masm.branchTestPtr(Assembler::Zero, protoReg, protoReg, &failure);
size_t shapeOffset = ICGetProp_NativeDoesNotExistImpl<0>::offsetOfShape(i);
masm.loadPtr(Address(ICStubReg, shapeOffset), scratch);
masm.branchTestObjShape(Assembler::NotEqual, protoReg, scratch, &failure);
}
// Shape and type checks succeeded, ok to proceed.
masm.moveValue(UndefinedValue(), R0);
// Normally for this op, the result would have to be monitored by TI.
// However, since this stub ALWAYS returns UndefinedValue(), and we can be sure
// that undefined is already registered with the type-set, this can be avoided.
EmitReturnFromIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICGetProp_CallScripted::Compiler::generateStubCode(MacroAssembler& masm)
{
MOZ_ASSERT(engine_ == Engine::Baseline);
Label failure;
Label failureLeaveStubFrame;
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register scratch = regs.takeAnyExcluding(ICTailCallReg);
// Guard input is an object.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
// Unbox and shape guard.
Register objReg = masm.extractObject(R0, ExtractTemp0);
GuardReceiverObject(masm, ReceiverGuard(receiver_), objReg, scratch,
ICGetProp_CallScripted::offsetOfReceiverGuard(), &failure);
if (receiver_ != holder_) {
Register holderReg = regs.takeAny();
masm.loadPtr(Address(ICStubReg, ICGetProp_CallScripted::offsetOfHolder()), holderReg);
masm.loadPtr(Address(ICStubReg, ICGetProp_CallScripted::offsetOfHolderShape()), scratch);
masm.branchTestObjShape(Assembler::NotEqual, holderReg, scratch, &failure);
regs.add(holderReg);
}
// Push a stub frame so that we can perform a non-tail call.
enterStubFrame(masm, scratch);
// Load callee function and code. To ensure that |code| doesn't end up being
// ArgumentsRectifierReg, if it's available we assign it to |callee| instead.
Register callee;
if (regs.has(ArgumentsRectifierReg)) {
callee = ArgumentsRectifierReg;
regs.take(callee);
} else {
callee = regs.takeAny();
}
Register code = regs.takeAny();
masm.loadPtr(Address(ICStubReg, ICGetProp_CallScripted::offsetOfGetter()), callee);
masm.branchIfFunctionHasNoScript(callee, &failureLeaveStubFrame);
masm.loadPtr(Address(callee, JSFunction::offsetOfNativeOrScript()), code);
masm.loadBaselineOrIonRaw(code, code, &failureLeaveStubFrame);
// Align the stack such that the JitFrameLayout is aligned on
// JitStackAlignment.
masm.alignJitStackBasedOnNArgs(0);
// Getter is called with 0 arguments, just |obj| as thisv.
// Note that we use Push, not push, so that callJit will align the stack
// properly on ARM.
masm.Push(R0);
EmitBaselineCreateStubFrameDescriptor(masm, scratch);
masm.Push(Imm32(0)); // ActualArgc is 0
masm.Push(callee);
masm.Push(scratch);
// Handle arguments underflow.
Label noUnderflow;
masm.load16ZeroExtend(Address(callee, JSFunction::offsetOfNargs()), scratch);
masm.branch32(Assembler::Equal, scratch, Imm32(0), &noUnderflow);
{
// Call the arguments rectifier.
MOZ_ASSERT(ArgumentsRectifierReg != code);
JitCode* argumentsRectifier =
cx->runtime()->jitRuntime()->getArgumentsRectifier();
masm.movePtr(ImmGCPtr(argumentsRectifier), code);
masm.loadPtr(Address(code, JitCode::offsetOfCode()), code);
masm.movePtr(ImmWord(0), ArgumentsRectifierReg);
}
masm.bind(&noUnderflow);
masm.callJit(code);
leaveStubFrame(masm, true);
// Enter type monitor IC to type-check result.
EmitEnterTypeMonitorIC(masm);
// Leave stub frame and go to next stub.
masm.bind(&failureLeaveStubFrame);
inStubFrame_ = true;
leaveStubFrame(masm, false);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
//
// VM function to help call native getters.
//
bool
DoCallNativeGetter(JSContext* cx, HandleFunction callee, HandleObject obj,
MutableHandleValue result)
{
MOZ_ASSERT(callee->isNative());
JSNative natfun = callee->native();
JS::AutoValueArray<2> vp(cx);
vp[0].setObject(*callee.get());
vp[1].setObject(*obj.get());
if (!natfun(cx, 0, vp.begin()))
return false;
result.set(vp[0]);
return true;
}
typedef bool (*DoCallNativeGetterFn)(JSContext*, HandleFunction, HandleObject, MutableHandleValue);
static const VMFunction DoCallNativeGetterInfo =
FunctionInfo<DoCallNativeGetterFn>(DoCallNativeGetter);
bool
ICGetPropCallNativeCompiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register objReg = InvalidReg;
MOZ_ASSERT(!(inputDefinitelyObject_ && outerClass_));
if (inputDefinitelyObject_) {
objReg = R0.scratchReg();
} else {
// Guard input is an object and unbox.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
objReg = masm.extractObject(R0, ExtractTemp0);
if (outerClass_) {
Register tmp = regs.takeAny();
masm.branchTestObjClass(Assembler::NotEqual, objReg, tmp, outerClass_, &failure);
masm.movePtr(ImmGCPtr(cx->global()), objReg);
regs.add(tmp);
}
}
Register scratch = regs.takeAnyExcluding(ICTailCallReg);
// Shape guard.
GuardReceiverObject(masm, ReceiverGuard(receiver_), objReg, scratch,
ICGetPropCallGetter::offsetOfReceiverGuard(), &failure);
if (receiver_ != holder_) {
Register holderReg = regs.takeAny();
// If we are generating a non-lexical GETGNAME stub, we must also
// guard on the shape of the GlobalObject.
if (kind == ICStub::GetProp_CallNativeGlobal) {
MOZ_ASSERT(receiver_->is<ClonedBlockObject>() &&
receiver_->as<ClonedBlockObject>().isGlobal());
GuardGlobalObject(masm, holder_, objReg, holderReg, scratch,
ICGetProp_CallNativeGlobal::offsetOfGlobalShape(), &failure);
}
masm.loadPtr(Address(ICStubReg, ICGetPropCallGetter::offsetOfHolder()), holderReg);
masm.loadPtr(Address(ICStubReg, ICGetPropCallGetter::offsetOfHolderShape()), scratch);
masm.branchTestObjShape(Assembler::NotEqual, holderReg, scratch, &failure);
regs.add(holderReg);
}
// Box and push obj onto baseline frame stack for decompiler
if (engine_ == Engine::Baseline) {
if (inputDefinitelyObject_)
masm.tagValue(JSVAL_TYPE_OBJECT, objReg, R0);
EmitStowICValues(masm, 1);
if (inputDefinitelyObject_)
objReg = masm.extractObject(R0, ExtractTemp0);
}
// Push a stub frame so that we can perform a non-tail call.
enterStubFrame(masm, scratch);
// Load callee function.
Register callee = regs.takeAny();
masm.loadPtr(Address(ICStubReg, ICGetPropCallGetter::offsetOfGetter()), callee);
// If we're calling a getter on the global, inline the logic for the
// 'this' hook on the global lexical scope and manually push the global.
if (kind == ICStub::GetProp_CallNativeGlobal)
masm.extractObject(Address(objReg, ScopeObject::offsetOfEnclosingScope()), objReg);
// Push args for vm call.
masm.Push(objReg);
masm.Push(callee);
regs.add(R0);
if (!callVM(DoCallNativeGetterInfo, masm))
return false;
leaveStubFrame(masm);
if (engine_ == Engine::Baseline)
EmitUnstowICValues(masm, 1, /* discard = */true);
// Enter type monitor IC to type-check result.
EmitEnterTypeMonitorIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
ICStub*
ICGetPropCallNativeCompiler::getStub(ICStubSpace* space)
{
ReceiverGuard guard(receiver_);
Shape* holderShape = holder_->as<NativeObject>().lastProperty();
switch (kind) {
case ICStub::GetProp_CallNative:
return newStub<ICGetProp_CallNative>(space, getStubCode(), firstMonitorStub_,
guard, holder_, holderShape,
getter_, pcOffset_);
case ICStub::GetProp_CallNativeGlobal: {
Shape* globalShape = receiver_->as<ClonedBlockObject>().global().lastProperty();
return newStub<ICGetProp_CallNativeGlobal>(space, getStubCode(), firstMonitorStub_,
guard, holder_, holderShape, globalShape,
getter_, pcOffset_);
}
default:
MOZ_CRASH("Bad stub kind");
}
}
// Callers are expected to have already guarded on the shape of the
// object, which guarantees the object is a DOM proxy.
void
CheckDOMProxyExpandoDoesNotShadow(JSContext* cx, MacroAssembler& masm, Register object,
const Address& checkExpandoShapeAddr,
Address* expandoAndGenerationAddr,
Address* generationAddr,
Register scratch,
AllocatableGeneralRegisterSet& domProxyRegSet,
Label* checkFailed)
{
// Guard that the object does not have expando properties, or has an expando
// which is known to not have the desired property.
// For the remaining code, we need to reserve some registers to load a value.
// This is ugly, but unavoidable.
ValueOperand tempVal = domProxyRegSet.takeAnyValue();
masm.pushValue(tempVal);
Label failDOMProxyCheck;
Label domProxyOk;
masm.loadPtr(Address(object, ProxyObject::offsetOfValues()), scratch);
Address expandoAddr(scratch, ProxyObject::offsetOfExtraSlotInValues(GetDOMProxyExpandoSlot()));
if (expandoAndGenerationAddr) {
MOZ_ASSERT(generationAddr);
masm.loadPtr(*expandoAndGenerationAddr, tempVal.scratchReg());
masm.branchPrivatePtr(Assembler::NotEqual, expandoAddr, tempVal.scratchReg(),
&failDOMProxyCheck);
masm.branch64(Assembler::NotEqual,
Address(tempVal.scratchReg(), ExpandoAndGeneration::offsetOfGeneration()),
*generationAddr,
scratch, &failDOMProxyCheck);
masm.loadValue(Address(tempVal.scratchReg(), 0), tempVal);
} else {
masm.loadValue(expandoAddr, tempVal);
}
// If the incoming object does not have an expando object then we're sure we're not
// shadowing.
masm.branchTestUndefined(Assembler::Equal, tempVal, &domProxyOk);
// The reference object used to generate this check may not have had an
// expando object at all, in which case the presence of a non-undefined
// expando value in the incoming object is automatically a failure.
masm.loadPtr(checkExpandoShapeAddr, scratch);
masm.branchPtr(Assembler::Equal, scratch, ImmPtr(nullptr), &failDOMProxyCheck);
// Otherwise, ensure that the incoming object has an object for its expando value and that
// the shape matches.
masm.branchTestObject(Assembler::NotEqual, tempVal, &failDOMProxyCheck);
Register objReg = masm.extractObject(tempVal, tempVal.scratchReg());
masm.branchTestObjShape(Assembler::Equal, objReg, scratch, &domProxyOk);
// Failure case: restore the tempVal registers and jump to failures.
masm.bind(&failDOMProxyCheck);
masm.popValue(tempVal);
masm.jump(checkFailed);
// Success case: restore the tempval and proceed.
masm.bind(&domProxyOk);
masm.popValue(tempVal);
}
bool
ICGetPropCallDOMProxyNativeCompiler::generateStubCode(MacroAssembler& masm,
Address* expandoAndGenerationAddr,
Address* generationAddr)
{
Label failure;
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register scratch = regs.takeAnyExcluding(ICTailCallReg);
// Guard input is an object.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
// Unbox.
Register objReg = masm.extractObject(R0, ExtractTemp0);
// Shape guard.
static const size_t receiverShapeOffset =
ICGetProp_CallDOMProxyNative::offsetOfReceiverGuard() +
HeapReceiverGuard::offsetOfShape();
masm.loadPtr(Address(ICStubReg, receiverShapeOffset), scratch);
masm.branchTestObjShape(Assembler::NotEqual, objReg, scratch, &failure);
// Guard that our expando object hasn't started shadowing this property.
{
AllocatableGeneralRegisterSet domProxyRegSet(GeneralRegisterSet::All());
domProxyRegSet.take(ICStubReg);
domProxyRegSet.take(objReg);
domProxyRegSet.take(scratch);
Address expandoShapeAddr(ICStubReg, ICGetProp_CallDOMProxyNative::offsetOfExpandoShape());
CheckDOMProxyExpandoDoesNotShadow(
cx, masm, objReg,
expandoShapeAddr, expandoAndGenerationAddr, generationAddr,
scratch,
domProxyRegSet,
&failure);
}
Register holderReg = regs.takeAny();
masm.loadPtr(Address(ICStubReg, ICGetProp_CallDOMProxyNative::offsetOfHolder()),
holderReg);
masm.loadPtr(Address(ICStubReg, ICGetProp_CallDOMProxyNative::offsetOfHolderShape()),
scratch);
masm.branchTestObjShape(Assembler::NotEqual, holderReg, scratch, &failure);
regs.add(holderReg);
// Push a stub frame so that we can perform a non-tail call.
enterStubFrame(masm, scratch);
// Load callee function.
Register callee = regs.takeAny();
masm.loadPtr(Address(ICStubReg, ICGetProp_CallDOMProxyNative::offsetOfGetter()), callee);
// Push args for vm call.
masm.Push(objReg);
masm.Push(callee);
// Don't have to preserve R0 anymore.
regs.add(R0);
if (!callVM(DoCallNativeGetterInfo, masm))
return false;
leaveStubFrame(masm);
// Enter type monitor IC to type-check result.
EmitEnterTypeMonitorIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICGetPropCallDOMProxyNativeCompiler::generateStubCode(MacroAssembler& masm)
{
if (kind == ICStub::GetProp_CallDOMProxyNative)
return generateStubCode(masm, nullptr, nullptr);
Address internalStructAddress(ICStubReg,
ICGetProp_CallDOMProxyWithGenerationNative::offsetOfInternalStruct());
Address generationAddress(ICStubReg,
ICGetProp_CallDOMProxyWithGenerationNative::offsetOfGeneration());
return generateStubCode(masm, &internalStructAddress, &generationAddress);
}
ICStub*
ICGetPropCallDOMProxyNativeCompiler::getStub(ICStubSpace* space)
{
RootedShape shape(cx, proxy_->maybeShape());
RootedShape holderShape(cx, holder_->as<NativeObject>().lastProperty());
Value expandoSlot = GetProxyExtra(proxy_, GetDOMProxyExpandoSlot());
RootedShape expandoShape(cx, nullptr);
ExpandoAndGeneration* expandoAndGeneration;
uint64_t generation;
Value expandoVal;
if (kind == ICStub::GetProp_CallDOMProxyNative) {
expandoVal = expandoSlot;
expandoAndGeneration = nullptr; // initialize to silence GCC warning
generation = 0; // initialize to silence GCC warning
} else {
MOZ_ASSERT(kind == ICStub::GetProp_CallDOMProxyWithGenerationNative);
MOZ_ASSERT(!expandoSlot.isObject() && !expandoSlot.isUndefined());
expandoAndGeneration = (ExpandoAndGeneration*)expandoSlot.toPrivate();
expandoVal = expandoAndGeneration->expando;
generation = expandoAndGeneration->generation;
}
if (expandoVal.isObject())
expandoShape = expandoVal.toObject().as<NativeObject>().lastProperty();
if (kind == ICStub::GetProp_CallDOMProxyNative) {
return newStub<ICGetProp_CallDOMProxyNative>(
space, getStubCode(), firstMonitorStub_, shape,
expandoShape, holder_, holderShape, getter_, pcOffset_);
}
return newStub<ICGetProp_CallDOMProxyWithGenerationNative>(
space, getStubCode(), firstMonitorStub_, shape,
expandoAndGeneration, generation, expandoShape, holder_, holderShape, getter_,
pcOffset_);
}
ICStub*
ICGetProp_DOMProxyShadowed::Compiler::getStub(ICStubSpace* space)
{
RootedShape shape(cx, proxy_->maybeShape());
return New<ICGetProp_DOMProxyShadowed>(cx, space, getStubCode(), firstMonitorStub_, shape,
proxy_->handler(), name_, pcOffset_);
}
static bool
ProxyGet(JSContext* cx, HandleObject proxy, HandlePropertyName name, MutableHandleValue vp)
{
RootedValue receiver(cx, ObjectValue(*proxy));
RootedId id(cx, NameToId(name));
return Proxy::get(cx, proxy, receiver, id, vp);
}
typedef bool (*ProxyGetFn)(JSContext* cx, HandleObject proxy, HandlePropertyName name,
MutableHandleValue vp);
static const VMFunction ProxyGetInfo = FunctionInfo<ProxyGetFn>(ProxyGet);
bool
ICGetProp_DOMProxyShadowed::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
// Need to reserve a scratch register, but the scratch register should not be
// ICTailCallReg, because it's used for |enterStubFrame| which needs a
// non-ICTailCallReg scratch reg.
Register scratch = regs.takeAnyExcluding(ICTailCallReg);
// Guard input is an object.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
// Unbox.
Register objReg = masm.extractObject(R0, ExtractTemp0);
// Shape guard.
masm.loadPtr(Address(ICStubReg, ICGetProp_DOMProxyShadowed::offsetOfShape()), scratch);
masm.branchTestObjShape(Assembler::NotEqual, objReg, scratch, &failure);
// No need to do any more guards; it's safe to call ProxyGet even
// if we've since stopped shadowing.
// Call ProxyGet(JSContext* cx, HandleObject proxy, HandlePropertyName name, MutableHandleValue vp);
// Push a stub frame so that we can perform a non-tail call.
enterStubFrame(masm, scratch);
// Push property name and proxy object.
masm.loadPtr(Address(ICStubReg, ICGetProp_DOMProxyShadowed::offsetOfName()), scratch);
masm.Push(scratch);
masm.Push(objReg);
// Don't have to preserve R0 anymore.
regs.add(R0);
if (!callVM(ProxyGetInfo, masm))
return false;
leaveStubFrame(masm);
// Enter type monitor IC to type-check result.
EmitEnterTypeMonitorIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICGetProp_ArgumentsLength::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
if (which_ == ICGetProp_ArgumentsLength::Magic) {
// Ensure that this is lazy arguments.
masm.branchTestMagicValue(Assembler::NotEqual, R0, JS_OPTIMIZED_ARGUMENTS, &failure);
// Ensure that frame has not loaded different arguments object since.
masm.branchTest32(Assembler::NonZero,
Address(BaselineFrameReg, BaselineFrame::reverseOffsetOfFlags()),
Imm32(BaselineFrame::HAS_ARGS_OBJ),
&failure);
Address actualArgs(BaselineFrameReg, BaselineFrame::offsetOfNumActualArgs());
masm.loadPtr(actualArgs, R0.scratchReg());
masm.tagValue(JSVAL_TYPE_INT32, R0.scratchReg(), R0);
EmitReturnFromIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
MOZ_ASSERT(which_ == ICGetProp_ArgumentsLength::Mapped ||
which_ == ICGetProp_ArgumentsLength::Unmapped);
const Class* clasp = (which_ == ICGetProp_ArgumentsLength::Mapped)
? &MappedArgumentsObject::class_
: &UnmappedArgumentsObject::class_;
Register scratchReg = R1.scratchReg();
// Guard on input being an arguments object.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
Register objReg = masm.extractObject(R0, ExtractTemp0);
masm.branchTestObjClass(Assembler::NotEqual, objReg, scratchReg, clasp, &failure);
// Get initial length value.
masm.unboxInt32(Address(objReg, ArgumentsObject::getInitialLengthSlotOffset()), scratchReg);
// Test if length has been overridden.
masm.branchTest32(Assembler::NonZero,
scratchReg,
Imm32(ArgumentsObject::LENGTH_OVERRIDDEN_BIT),
&failure);
// Nope, shift out arguments length and return it.
// No need to type monitor because this stub always returns Int32.
masm.rshiftPtr(Imm32(ArgumentsObject::PACKED_BITS_COUNT), scratchReg);
masm.tagValue(JSVAL_TYPE_INT32, scratchReg, R0);
EmitReturnFromIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
ICGetProp_ArgumentsCallee::ICGetProp_ArgumentsCallee(JitCode* stubCode, ICStub* firstMonitorStub)
: ICMonitoredStub(GetProp_ArgumentsCallee, stubCode, firstMonitorStub)
{ }
bool
ICGetProp_ArgumentsCallee::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
// Ensure that this is lazy arguments.
masm.branchTestMagicValue(Assembler::NotEqual, R0, JS_OPTIMIZED_ARGUMENTS, &failure);
// Ensure that frame has not loaded different arguments object since.
masm.branchTest32(Assembler::NonZero,
Address(BaselineFrameReg, BaselineFrame::reverseOffsetOfFlags()),
Imm32(BaselineFrame::HAS_ARGS_OBJ),
&failure);
Address callee(BaselineFrameReg, BaselineFrame::offsetOfCalleeToken());
masm.loadFunctionFromCalleeToken(callee, R0.scratchReg());
masm.tagValue(JSVAL_TYPE_OBJECT, R0.scratchReg(), R0);
EmitEnterTypeMonitorIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
/* static */ ICGetProp_Generic*
ICGetProp_Generic::Clone(JSContext* cx, ICStubSpace* space, ICStub* firstMonitorStub,
ICGetProp_Generic& other)
{
return New<ICGetProp_Generic>(cx, space, other.jitCode(), firstMonitorStub);
}
static bool
DoGetPropGeneric(JSContext* cx, BaselineFrame* frame, ICGetProp_Generic* stub,
MutableHandleValue val, MutableHandleValue res)
{
ICFallbackStub* fallback = stub->getChainFallback();
RootedScript script(cx, SharedStubScript(frame, fallback));
jsbytecode* pc = fallback->icEntry()->pc(script);
JSOp op = JSOp(*pc);
RootedPropertyName name(cx, script->getName(pc));
return ComputeGetPropResult(cx, frame, op, name, val, res);
}
typedef bool (*DoGetPropGenericFn)(JSContext*, BaselineFrame*, ICGetProp_Generic*, MutableHandleValue, MutableHandleValue);
static const VMFunction DoGetPropGenericInfo = FunctionInfo<DoGetPropGenericFn>(DoGetPropGeneric);
bool
ICGetProp_Generic::Compiler::generateStubCode(MacroAssembler& masm)
{
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register scratch = regs.takeAnyExcluding(ICTailCallReg);
// Sync for the decompiler.
if (engine_ == Engine::Baseline)
EmitStowICValues(masm, 1);
enterStubFrame(masm, scratch);
// Push arguments.
masm.Push(R0);
masm.Push(ICStubReg);
PushFramePtr(masm, R0.scratchReg());
if (!callVM(DoGetPropGenericInfo, masm))
return false;
leaveStubFrame(masm);
if (engine_ == Engine::Baseline)
EmitUnstowICValues(masm, 1, /* discard = */ true);
EmitEnterTypeMonitorIC(masm);
return true;
}
bool
ICGetProp_Unboxed::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register scratch = regs.takeAnyExcluding(ICTailCallReg);
// Object and group guard.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
Register object = masm.extractObject(R0, ExtractTemp0);
masm.loadPtr(Address(ICStubReg, ICGetProp_Unboxed::offsetOfGroup()), scratch);
masm.branchPtr(Assembler::NotEqual, Address(object, JSObject::offsetOfGroup()), scratch,
&failure);
// Get the address being read from.
masm.load32(Address(ICStubReg, ICGetProp_Unboxed::offsetOfFieldOffset()), scratch);
masm.loadUnboxedProperty(BaseIndex(object, scratch, TimesOne), fieldType_, TypedOrValueRegister(R0));
// Only monitor the result if its type might change.
if (fieldType_ == JSVAL_TYPE_OBJECT)
EmitEnterTypeMonitorIC(masm);
else
EmitReturnFromIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
void
CheckForNeuteredTypedObject(JSContext* cx, MacroAssembler& masm, Label* failure)
{
// All stubs which manipulate typed objects need to check the compartment
// wide flag indicating whether the objects are neutered, and bail out in
// this case.
int32_t* address = &cx->compartment()->neuteredTypedObjects;
masm.branch32(Assembler::NotEqual, AbsoluteAddress(address), Imm32(0), failure);
}
void
LoadTypedThingData(MacroAssembler& masm, TypedThingLayout layout, Register obj, Register result)
{
switch (layout) {
case Layout_TypedArray:
masm.loadPtr(Address(obj, TypedArrayObject::dataOffset()), result);
break;
case Layout_OutlineTypedObject:
masm.loadPtr(Address(obj, OutlineTypedObject::offsetOfData()), result);
break;
case Layout_InlineTypedObject:
masm.computeEffectiveAddress(Address(obj, InlineTypedObject::offsetOfDataStart()), result);
break;
default:
MOZ_CRASH();
}
}
bool
ICGetProp_TypedObject::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
CheckForNeuteredTypedObject(cx, masm, &failure);
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register scratch1 = regs.takeAnyExcluding(ICTailCallReg);
Register scratch2 = regs.takeAnyExcluding(ICTailCallReg);
// Object and shape guard.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
Register object = masm.extractObject(R0, ExtractTemp0);
masm.loadPtr(Address(ICStubReg, ICGetProp_TypedObject::offsetOfShape()), scratch1);
masm.branchTestObjShape(Assembler::NotEqual, object, scratch1, &failure);
// Get the object's data pointer.
LoadTypedThingData(masm, layout_, object, scratch1);
// Get the address being written to.
masm.load32(Address(ICStubReg, ICGetProp_TypedObject::offsetOfFieldOffset()), scratch2);
masm.addPtr(scratch2, scratch1);
// Only monitor the result if the type produced by this stub might vary.
bool monitorLoad;
if (fieldDescr_->is<ScalarTypeDescr>()) {
Scalar::Type type = fieldDescr_->as<ScalarTypeDescr>().type();
monitorLoad = type == Scalar::Uint32;
masm.loadFromTypedArray(type, Address(scratch1, 0), R0, /* allowDouble = */ true,
scratch2, nullptr);
} else {
ReferenceTypeDescr::Type type = fieldDescr_->as<ReferenceTypeDescr>().type();
monitorLoad = type != ReferenceTypeDescr::TYPE_STRING;
switch (type) {
case ReferenceTypeDescr::TYPE_ANY:
masm.loadValue(Address(scratch1, 0), R0);
break;
case ReferenceTypeDescr::TYPE_OBJECT: {
Label notNull, done;
masm.loadPtr(Address(scratch1, 0), scratch1);
masm.branchTestPtr(Assembler::NonZero, scratch1, scratch1, &notNull);
masm.moveValue(NullValue(), R0);
masm.jump(&done);
masm.bind(&notNull);
masm.tagValue(JSVAL_TYPE_OBJECT, scratch1, R0);
masm.bind(&done);
break;
}
case ReferenceTypeDescr::TYPE_STRING:
masm.loadPtr(Address(scratch1, 0), scratch1);
masm.tagValue(JSVAL_TYPE_STRING, scratch1, R0);
break;
default:
MOZ_CRASH();
}
}
if (monitorLoad)
EmitEnterTypeMonitorIC(masm);
else
EmitReturnFromIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICGetProp_ModuleNamespace::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
AllocatableGeneralRegisterSet regs(availableGeneralRegs(1));
Register scratch = regs.takeAnyExcluding(ICTailCallReg);
// Guard on namespace object.
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
Register object = masm.extractObject(R0, ExtractTemp0);
masm.loadPtr(Address(ICStubReg, ICGetProp_ModuleNamespace::offsetOfNamespace()), scratch);
masm.branchPtr(Assembler::NotEqual, object, scratch, &failure);
// Determine base pointer for load.
Register loadBase = regs.takeAnyExcluding(ICTailCallReg);
masm.loadPtr(Address(ICStubReg, ICGetProp_ModuleNamespace::offsetOfEnvironment()), loadBase);
if (!isFixedSlot_)
masm.loadPtr(Address(loadBase, NativeObject::offsetOfSlots()), loadBase);
// Load the property.
masm.load32(Address(ICStubReg, ICGetProp_ModuleNamespace::offsetOfOffset()), scratch);
masm.loadValue(BaseIndex(loadBase, scratch, TimesOne), R0);
// Enter type monitor IC to type-check result.
EmitEnterTypeMonitorIC(masm);
// Failure case - jump to next stub
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
void
BaselineScript::noteAccessedGetter(uint32_t pcOffset)
{
ICEntry& entry = icEntryFromPCOffset(pcOffset);
ICFallbackStub* stub = entry.fallbackStub();
if (stub->isGetProp_Fallback())
stub->toGetProp_Fallback()->noteAccessedGetter();
}
ICGetProp_Primitive::ICGetProp_Primitive(JitCode* stubCode, ICStub* firstMonitorStub,
JSValueType primitiveType, Shape* protoShape,
uint32_t offset)
: ICMonitoredStub(GetProp_Primitive, stubCode, firstMonitorStub),
protoShape_(protoShape),
offset_(offset)
{
extra_ = uint16_t(primitiveType);
MOZ_ASSERT(JSValueType(extra_) == primitiveType);
}
ICGetPropNativeStub::ICGetPropNativeStub(ICStub::Kind kind, JitCode* stubCode,
ICStub* firstMonitorStub,
ReceiverGuard guard, uint32_t offset)
: ICMonitoredStub(kind, stubCode, firstMonitorStub),
receiverGuard_(guard),
offset_(offset)
{ }
/* static */ ICGetProp_Native*
ICGetProp_Native::Clone(JSContext* cx, ICStubSpace* space, ICStub* firstMonitorStub,
ICGetProp_Native& other)
{
return New<ICGetProp_Native>(cx, space, other.jitCode(), firstMonitorStub,
other.receiverGuard(), other.offset());
}
ICGetPropNativePrototypeStub::ICGetPropNativePrototypeStub(ICStub::Kind kind, JitCode* stubCode,
ICStub* firstMonitorStub,
ReceiverGuard guard, uint32_t offset,
JSObject* holder, Shape* holderShape)
: ICGetPropNativeStub(kind, stubCode, firstMonitorStub, guard, offset),
holder_(holder),
holderShape_(holderShape)
{ }
/* static */ ICGetProp_NativePrototype*
ICGetProp_NativePrototype::Clone(JSContext* cx, ICStubSpace* space, ICStub* firstMonitorStub,
ICGetProp_NativePrototype& other)
{
return New<ICGetProp_NativePrototype>(cx, space, other.jitCode(), firstMonitorStub,
other.receiverGuard(), other.offset(),
other.holder(), other.holderShape());
}
ICGetProp_NativeDoesNotExist::ICGetProp_NativeDoesNotExist(
JitCode* stubCode, ICStub* firstMonitorStub, ReceiverGuard guard,
size_t protoChainDepth)
: ICMonitoredStub(GetProp_NativeDoesNotExist, stubCode, firstMonitorStub),
guard_(guard)
{
MOZ_ASSERT(protoChainDepth <= MAX_PROTO_CHAIN_DEPTH);
extra_ = protoChainDepth;
}
/* static */ size_t
ICGetProp_NativeDoesNotExist::offsetOfShape(size_t idx)
{
MOZ_ASSERT(ICGetProp_NativeDoesNotExistImpl<0>::offsetOfShape(idx) ==
ICGetProp_NativeDoesNotExistImpl<
ICGetProp_NativeDoesNotExist::MAX_PROTO_CHAIN_DEPTH>::offsetOfShape(idx));
return ICGetProp_NativeDoesNotExistImpl<0>::offsetOfShape(idx);
}
template <size_t ProtoChainDepth>
ICGetProp_NativeDoesNotExistImpl<ProtoChainDepth>::ICGetProp_NativeDoesNotExistImpl(
JitCode* stubCode, ICStub* firstMonitorStub, ReceiverGuard guard,
Handle<ShapeVector> shapes)
: ICGetProp_NativeDoesNotExist(stubCode, firstMonitorStub, guard, ProtoChainDepth)
{
MOZ_ASSERT(shapes.length() == NumShapes);
// Note: using int32_t here to avoid gcc warning.
for (int32_t i = 0; i < int32_t(NumShapes); i++)
shapes_[i].init(shapes[i]);
}
ICGetPropNativeDoesNotExistCompiler::ICGetPropNativeDoesNotExistCompiler(
JSContext* cx, ICStubCompiler::Engine engine, ICStub* firstMonitorStub,
HandleObject obj, size_t protoChainDepth)
: ICStubCompiler(cx, ICStub::GetProp_NativeDoesNotExist, engine),
firstMonitorStub_(firstMonitorStub),
obj_(cx, obj),
protoChainDepth_(protoChainDepth)
{
MOZ_ASSERT(protoChainDepth_ <= ICGetProp_NativeDoesNotExist::MAX_PROTO_CHAIN_DEPTH);
}
ICGetPropCallGetter::ICGetPropCallGetter(Kind kind, JitCode* stubCode, ICStub* firstMonitorStub,
ReceiverGuard receiverGuard, JSObject* holder,
Shape* holderShape, JSFunction* getter,
uint32_t pcOffset)
: ICMonitoredStub(kind, stubCode, firstMonitorStub),
receiverGuard_(receiverGuard),
holder_(holder),
holderShape_(holderShape),
getter_(getter),
pcOffset_(pcOffset)
{
MOZ_ASSERT(kind == ICStub::GetProp_CallScripted ||
kind == ICStub::GetProp_CallNative ||
kind == ICStub::GetProp_CallNativeGlobal ||
kind == ICStub::GetProp_CallDOMProxyNative ||
kind == ICStub::GetProp_CallDOMProxyWithGenerationNative);
}
/* static */ ICGetProp_CallScripted*
ICGetProp_CallScripted::Clone(JSContext* cx, ICStubSpace* space, ICStub* firstMonitorStub,
ICGetProp_CallScripted& other)
{
return New<ICGetProp_CallScripted>(cx, space, other.jitCode(), firstMonitorStub,
other.receiverGuard(),
other.holder_, other.holderShape_,
other.getter_, other.pcOffset_);
}
/* static */ ICGetProp_CallNative*
ICGetProp_CallNative::Clone(JSContext* cx, ICStubSpace* space, ICStub* firstMonitorStub,
ICGetProp_CallNative& other)
{
return New<ICGetProp_CallNative>(cx, space, other.jitCode(), firstMonitorStub,
other.receiverGuard(), other.holder_,
other.holderShape_, other.getter_, other.pcOffset_);
}
/* static */ ICGetProp_CallNativeGlobal*
ICGetProp_CallNativeGlobal::Clone(JSContext* cx, ICStubSpace* space, ICStub* firstMonitorStub,
ICGetProp_CallNativeGlobal& other)
{
return New<ICGetProp_CallNativeGlobal>(cx, space, other.jitCode(), firstMonitorStub,
other.receiverGuard(), other.holder_,
other.holderShape_, other.globalShape_,
other.getter_, other.pcOffset_);
}
ICGetPropCallDOMProxyNativeStub::ICGetPropCallDOMProxyNativeStub(Kind kind, JitCode* stubCode,
ICStub* firstMonitorStub,
Shape* shape,
Shape* expandoShape,
JSObject* holder,
Shape* holderShape,
JSFunction* getter,
uint32_t pcOffset)
: ICGetPropCallGetter(kind, stubCode, firstMonitorStub, ReceiverGuard(nullptr, shape),
holder, holderShape, getter, pcOffset),
expandoShape_(expandoShape)
{ }
ICGetPropCallDOMProxyNativeCompiler::ICGetPropCallDOMProxyNativeCompiler(JSContext* cx,
ICStub::Kind kind,
ICStubCompiler::Engine engine,
ICStub* firstMonitorStub,
Handle<ProxyObject*> proxy,
HandleObject holder,
HandleFunction getter,
uint32_t pcOffset)
: ICStubCompiler(cx, kind, engine),
firstMonitorStub_(firstMonitorStub),
proxy_(cx, proxy),
holder_(cx, holder),
getter_(cx, getter),
pcOffset_(pcOffset)
{
MOZ_ASSERT(kind == ICStub::GetProp_CallDOMProxyNative ||
kind == ICStub::GetProp_CallDOMProxyWithGenerationNative);
MOZ_ASSERT(proxy_->handler()->family() == GetDOMProxyHandlerFamily());
}
/* static */ ICGetProp_CallDOMProxyNative*
ICGetProp_CallDOMProxyNative::Clone(JSContext* cx, ICStubSpace* space, ICStub* firstMonitorStub,
ICGetProp_CallDOMProxyNative& other)
{
return New<ICGetProp_CallDOMProxyNative>(cx, space, other.jitCode(), firstMonitorStub,
other.receiverGuard_.shape(), other.expandoShape_,
other.holder_, other.holderShape_, other.getter_,
other.pcOffset_);
}
/* static */ ICGetProp_CallDOMProxyWithGenerationNative*
ICGetProp_CallDOMProxyWithGenerationNative::Clone(JSContext* cx,
ICStubSpace* space,
ICStub* firstMonitorStub,
ICGetProp_CallDOMProxyWithGenerationNative& other)
{
return New<ICGetProp_CallDOMProxyWithGenerationNative>(cx, space, other.jitCode(),
firstMonitorStub,
other.receiverGuard_.shape(),
other.expandoAndGeneration_,
other.generation_,
other.expandoShape_, other.holder_,
other.holderShape_, other.getter_,
other.pcOffset_);
}
ICGetProp_DOMProxyShadowed::ICGetProp_DOMProxyShadowed(JitCode* stubCode,
ICStub* firstMonitorStub,
Shape* shape,
const BaseProxyHandler* proxyHandler,
PropertyName* name,
uint32_t pcOffset)
: ICMonitoredStub(ICStub::GetProp_DOMProxyShadowed, stubCode, firstMonitorStub),
shape_(shape),
proxyHandler_(proxyHandler),
name_(name),
pcOffset_(pcOffset)
{ }
/* static */ ICGetProp_DOMProxyShadowed*
ICGetProp_DOMProxyShadowed::Clone(JSContext* cx, ICStubSpace* space, ICStub* firstMonitorStub,
ICGetProp_DOMProxyShadowed& other)
{
return New<ICGetProp_DOMProxyShadowed>(cx, space, other.jitCode(), firstMonitorStub,
other.shape_, other.proxyHandler_, other.name_,
other.pcOffset_);
}
//
// TypeMonitor_Fallback
//
bool
ICTypeMonitor_Fallback::addMonitorStubForValue(JSContext* cx, JSScript* script, HandleValue val, ICStubCompiler::Engine engine)
{
bool wasDetachedMonitorChain = lastMonitorStubPtrAddr_ == nullptr;
MOZ_ASSERT_IF(wasDetachedMonitorChain, numOptimizedMonitorStubs_ == 0);
if (numOptimizedMonitorStubs_ >= MAX_OPTIMIZED_STUBS) {
// TODO: if the TypeSet becomes unknown or has the AnyObject type,
// replace stubs with a single stub to handle these.
return true;
}
if (val.isPrimitive()) {
if (val.isMagic(JS_UNINITIALIZED_LEXICAL))
return true;
MOZ_ASSERT(!val.isMagic());
JSValueType type = val.isDouble() ? JSVAL_TYPE_DOUBLE : val.extractNonDoubleType();
// Check for existing TypeMonitor stub.
ICTypeMonitor_PrimitiveSet* existingStub = nullptr;
for (ICStubConstIterator iter(firstMonitorStub()); !iter.atEnd(); iter++) {
if (iter->isTypeMonitor_PrimitiveSet()) {
existingStub = iter->toTypeMonitor_PrimitiveSet();
if (existingStub->containsType(type))
return true;
}
}
ICTypeMonitor_PrimitiveSet::Compiler compiler(cx, engine, existingStub, type);
ICStub* stub = existingStub ? compiler.updateStub()
: compiler.getStub(compiler.getStubSpace(script));
if (!stub) {
ReportOutOfMemory(cx);
return false;
}
JitSpew(JitSpew_BaselineIC, " %s TypeMonitor stub %p for primitive type %d",
existingStub ? "Modified existing" : "Created new", stub, type);
if (!existingStub) {
MOZ_ASSERT(!hasStub(TypeMonitor_PrimitiveSet));
addOptimizedMonitorStub(stub);
}
} else if (val.toObject().isSingleton()) {
RootedObject obj(cx, &val.toObject());
// Check for existing TypeMonitor stub.
for (ICStubConstIterator iter(firstMonitorStub()); !iter.atEnd(); iter++) {
if (iter->isTypeMonitor_SingleObject() &&
iter->toTypeMonitor_SingleObject()->object() == obj)
{
return true;
}
}
ICTypeMonitor_SingleObject::Compiler compiler(cx, obj);
ICStub* stub = compiler.getStub(compiler.getStubSpace(script));
if (!stub) {
ReportOutOfMemory(cx);
return false;
}
JitSpew(JitSpew_BaselineIC, " Added TypeMonitor stub %p for singleton %p",
stub, obj.get());
addOptimizedMonitorStub(stub);
} else {
RootedObjectGroup group(cx, val.toObject().group());
// Check for existing TypeMonitor stub.
for (ICStubConstIterator iter(firstMonitorStub()); !iter.atEnd(); iter++) {
if (iter->isTypeMonitor_ObjectGroup() &&
iter->toTypeMonitor_ObjectGroup()->group() == group)
{
return true;
}
}
ICTypeMonitor_ObjectGroup::Compiler compiler(cx, group);
ICStub* stub = compiler.getStub(compiler.getStubSpace(script));
if (!stub) {
ReportOutOfMemory(cx);
return false;
}
JitSpew(JitSpew_BaselineIC, " Added TypeMonitor stub %p for ObjectGroup %p",
stub, group.get());
addOptimizedMonitorStub(stub);
}
bool firstMonitorStubAdded = wasDetachedMonitorChain && (numOptimizedMonitorStubs_ > 0);
if (firstMonitorStubAdded) {
// Was an empty monitor chain before, but a new stub was added. This is the
// only time that any main stubs' firstMonitorStub fields need to be updated to
// refer to the newly added monitor stub.
ICStub* firstStub = mainFallbackStub_->icEntry()->firstStub();
for (ICStubConstIterator iter(firstStub); !iter.atEnd(); iter++) {
// Non-monitored stubs are used if the result has always the same type,
// e.g. a StringLength stub will always return int32.
if (!iter->isMonitored())
continue;
// Since we just added the first optimized monitoring stub, any
// existing main stub's |firstMonitorStub| MUST be pointing to the fallback
// monitor stub (i.e. this stub).
MOZ_ASSERT(iter->toMonitoredStub()->firstMonitorStub() == this);
iter->toMonitoredStub()->updateFirstMonitorStub(firstMonitorStub_);
}
}
return true;
}
static bool
DoTypeMonitorFallback(JSContext* cx, BaselineFrame* frame, ICTypeMonitor_Fallback* stub,
HandleValue value, MutableHandleValue res)
{
ICStubCompiler::Engine engine = SharedStubEngine(frame);
RootedScript script(cx, SharedStubScript(frame, stub));
jsbytecode* pc = stub->icEntry()->pc(script);
TypeFallbackICSpew(cx, stub, "TypeMonitor");
if (value.isMagic()) {
// It's possible that we arrived here from bailing out of Ion, and that
// Ion proved that the value is dead and optimized out. In such cases,
// do nothing. However, it's also possible that we have an uninitialized
// this, in which case we should not look for other magic values.
if (value.whyMagic() == JS_OPTIMIZED_OUT) {
MOZ_ASSERT(!stub->monitorsThis());
res.set(value);
return true;
}
// In derived class constructors (including nested arrows/eval), the
// |this| argument or GETALIASEDVAR can return the magic TDZ value.
MOZ_ASSERT(value.isMagic(JS_UNINITIALIZED_LEXICAL));
MOZ_ASSERT(frame->isFunctionFrame());
MOZ_ASSERT(stub->monitorsThis() ||
*GetNextPc(pc) == JSOP_CHECKTHIS ||
*GetNextPc(pc) == JSOP_CHECKRETURN);
}
uint32_t argument;
if (stub->monitorsThis()) {
MOZ_ASSERT(pc == script->code());
if (value.isMagic(JS_UNINITIALIZED_LEXICAL))
TypeScript::SetThis(cx, script, TypeSet::UnknownType());
else
TypeScript::SetThis(cx, script, value);
} else if (stub->monitorsArgument(&argument)) {
MOZ_ASSERT(pc == script->code());
MOZ_ASSERT(!value.isMagic(JS_UNINITIALIZED_LEXICAL));
TypeScript::SetArgument(cx, script, argument, value);
} else {
if (value.isMagic(JS_UNINITIALIZED_LEXICAL))
TypeScript::Monitor(cx, script, pc, TypeSet::UnknownType());
else
TypeScript::Monitor(cx, script, pc, value);
}
if (!stub->addMonitorStubForValue(cx, script, value, engine))
return false;
// Copy input value to res.
res.set(value);
return true;
}
typedef bool (*DoTypeMonitorFallbackFn)(JSContext*, BaselineFrame*, ICTypeMonitor_Fallback*,
HandleValue, MutableHandleValue);
static const VMFunction DoTypeMonitorFallbackInfo =
FunctionInfo<DoTypeMonitorFallbackFn>(DoTypeMonitorFallback, TailCall);
bool
ICTypeMonitor_Fallback::Compiler::generateStubCode(MacroAssembler& masm)
{
MOZ_ASSERT(R0 == JSReturnOperand);
// Restore the tail call register.
EmitRestoreTailCallReg(masm);
masm.pushValue(R0);
masm.push(ICStubReg);
pushFramePtr(masm, R0.scratchReg());
return tailCallVM(DoTypeMonitorFallbackInfo, masm);
}
bool
ICTypeMonitor_PrimitiveSet::Compiler::generateStubCode(MacroAssembler& masm)
{
Label success;
if ((flags_ & TypeToFlag(JSVAL_TYPE_INT32)) && !(flags_ & TypeToFlag(JSVAL_TYPE_DOUBLE)))
masm.branchTestInt32(Assembler::Equal, R0, &success);
if (flags_ & TypeToFlag(JSVAL_TYPE_DOUBLE))
masm.branchTestNumber(Assembler::Equal, R0, &success);
if (flags_ & TypeToFlag(JSVAL_TYPE_UNDEFINED))
masm.branchTestUndefined(Assembler::Equal, R0, &success);
if (flags_ & TypeToFlag(JSVAL_TYPE_BOOLEAN))
masm.branchTestBoolean(Assembler::Equal, R0, &success);
if (flags_ & TypeToFlag(JSVAL_TYPE_STRING))
masm.branchTestString(Assembler::Equal, R0, &success);
if (flags_ & TypeToFlag(JSVAL_TYPE_SYMBOL))
masm.branchTestSymbol(Assembler::Equal, R0, &success);
// Currently, we will never generate primitive stub checks for object. However,
// when we do get to the point where we want to collapse our monitor chains of
// objects and singletons down (when they get too long) to a generic "any object"
// in coordination with the typeset doing the same thing, this will need to
// be re-enabled.
/*
if (flags_ & TypeToFlag(JSVAL_TYPE_OBJECT))
masm.branchTestObject(Assembler::Equal, R0, &success);
*/
MOZ_ASSERT(!(flags_ & TypeToFlag(JSVAL_TYPE_OBJECT)));
if (flags_ & TypeToFlag(JSVAL_TYPE_NULL))
masm.branchTestNull(Assembler::Equal, R0, &success);
EmitStubGuardFailure(masm);
masm.bind(&success);
EmitReturnFromIC(masm);
return true;
}
bool
ICTypeMonitor_SingleObject::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
// Guard on the object's identity.
Register obj = masm.extractObject(R0, ExtractTemp0);
Address expectedObject(ICStubReg, ICTypeMonitor_SingleObject::offsetOfObject());
masm.branchPtr(Assembler::NotEqual, expectedObject, obj, &failure);
EmitReturnFromIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICTypeMonitor_ObjectGroup::Compiler::generateStubCode(MacroAssembler& masm)
{
Label failure;
masm.branchTestObject(Assembler::NotEqual, R0, &failure);
// Guard on the object's ObjectGroup.
Register obj = masm.extractObject(R0, ExtractTemp0);
masm.loadPtr(Address(obj, JSObject::offsetOfGroup()), R1.scratchReg());
Address expectedGroup(ICStubReg, ICTypeMonitor_ObjectGroup::offsetOfGroup());
masm.branchPtr(Assembler::NotEqual, expectedGroup, R1.scratchReg(), &failure);
EmitReturnFromIC(masm);
masm.bind(&failure);
EmitStubGuardFailure(masm);
return true;
}
bool
ICUpdatedStub::addUpdateStubForValue(JSContext* cx, HandleScript script, HandleObject obj,
HandleId id, HandleValue val)
{
if (numOptimizedStubs_ >= MAX_OPTIMIZED_STUBS) {
// TODO: if the TypeSet becomes unknown or has the AnyObject type,
// replace stubs with a single stub to handle these.
return true;
}
EnsureTrackPropertyTypes(cx, obj, id);
// Make sure that undefined values are explicitly included in the property
// types for an object if generating a stub to write an undefined value.
if (val.isUndefined() && CanHaveEmptyPropertyTypesForOwnProperty(obj))
AddTypePropertyId(cx, obj, id, val);
if (val.isPrimitive()) {
JSValueType type = val.isDouble() ? JSVAL_TYPE_DOUBLE : val.extractNonDoubleType();
// Check for existing TypeUpdate stub.
ICTypeUpdate_PrimitiveSet* existingStub = nullptr;
for (ICStubConstIterator iter(firstUpdateStub_); !iter.atEnd(); iter++) {
if (iter->isTypeUpdate_PrimitiveSet()) {
existingStub = iter->toTypeUpdate_PrimitiveSet();
if (existingStub->containsType(type))
return true;
}
}
ICTypeUpdate_PrimitiveSet::Compiler compiler(cx, existingStub, type);
ICStub* stub = existingStub ? compiler.updateStub()
: compiler.getStub(compiler.getStubSpace(script));
if (!stub)
return false;
if (!existingStub) {
MOZ_ASSERT(!hasTypeUpdateStub(TypeUpdate_PrimitiveSet));
addOptimizedUpdateStub(stub);
}
JitSpew(JitSpew_BaselineIC, " %s TypeUpdate stub %p for primitive type %d",
existingStub ? "Modified existing" : "Created new", stub, type);
} else if (val.toObject().isSingleton()) {
RootedObject obj(cx, &val.toObject());
// Check for existing TypeUpdate stub.
for (ICStubConstIterator iter(firstUpdateStub_); !iter.atEnd(); iter++) {
if (iter->isTypeUpdate_SingleObject() &&
iter->toTypeUpdate_SingleObject()->object() == obj)
{
return true;
}
}
ICTypeUpdate_SingleObject::Compiler compiler(cx, obj);
ICStub* stub = compiler.getStub(compiler.getStubSpace(script));
if (!stub)
return false;
JitSpew(JitSpew_BaselineIC, " Added TypeUpdate stub %p for singleton %p", stub, obj.get());
addOptimizedUpdateStub(stub);
} else {
RootedObjectGroup group(cx, val.toObject().group());
// Check for existing TypeUpdate stub.
for (ICStubConstIterator iter(firstUpdateStub_); !iter.atEnd(); iter++) {
if (iter->isTypeUpdate_ObjectGroup() &&
iter->toTypeUpdate_ObjectGroup()->group() == group)
{
return true;
}
}
ICTypeUpdate_ObjectGroup::Compiler compiler(cx, group);
ICStub* stub = compiler.getStub(compiler.getStubSpace(script));
if (!stub)
return false;
JitSpew(JitSpew_BaselineIC, " Added TypeUpdate stub %p for ObjectGroup %p",
stub, group.get());
addOptimizedUpdateStub(stub);
}
return true;
}
} // namespace jit
} // namespace js