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cobalt / cobalt / b15365272e6489fad522fda39eabf582f874017d / . / src / third_party / mozjs / js / src / jsinfer.cpp
blob: 3a26388be822b8da7b2ba6e694a94359cffaa8ae [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 "jsinfer.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/PodOperations.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "jsgc.h"
#include "jsobj.h"
#include "jsscript.h"
#include "jscntxt.h"
#include "jsstr.h"
#include "jsworkers.h"
#include "prmjtime.h"
#ifdef JS_ION
#include "jit/BaselineJIT.h"
#include "jit/Ion.h"
#include "jit/IonCompartment.h"
#endif
#include "gc/Marking.h"
#include "js/MemoryMetrics.h"
#include "vm/Shape.h"
#include "jsanalyzeinlines.h"
#include "jsatominlines.h"
#include "jsgcinlines.h"
#include "jsinferinlines.h"
#include "jsopcodeinlines.h"
#include "jsobjinlines.h"
#include "jsscriptinlines.h"
#include "vm/Stack-inl.h"
#ifdef __SUNPRO_CC
#include <alloca.h>
#endif
using namespace js;
using namespace js::gc;
using namespace js::types;
using namespace js::analyze;
using mozilla::DebugOnly;
using mozilla::PodArrayZero;
using mozilla::PodCopy;
using mozilla::PodZero;
static inline jsid
id_prototype(JSContext *cx) {
return NameToId(cx->names().classPrototype);
}
static inline jsid
id_length(JSContext *cx) {
return NameToId(cx->names().length);
}
static inline jsid
id___proto__(JSContext *cx) {
return NameToId(cx->names().proto);
}
static inline jsid
id_constructor(JSContext *cx) {
return NameToId(cx->names().constructor);
}
static inline jsid
id_caller(JSContext *cx) {
return NameToId(cx->names().caller);
}
#ifdef DEBUG
const char *
types::TypeIdStringImpl(jsid id)
{
if (JSID_IS_VOID(id))
return "(index)";
if (JSID_IS_EMPTY(id))
return "(new)";
static char bufs[4][100];
static unsigned which = 0;
which = (which + 1) & 3;
PutEscapedString(bufs[which], 100, JSID_TO_FLAT_STRING(id), 0);
return bufs[which];
}
#endif
/////////////////////////////////////////////////////////////////////
// Logging
/////////////////////////////////////////////////////////////////////
static bool InferSpewActive(SpewChannel channel)
{
static bool active[SPEW_COUNT];
static bool checked = false;
if (!checked) {
checked = true;
PodArrayZero(active);
#if defined(STARBOARD)
return false;
#else
const char *env = getenv("INFERFLAGS");
if (!env)
return false;
if (strstr(env, "ops"))
active[ISpewOps] = true;
if (strstr(env, "result"))
active[ISpewResult] = true;
if (strstr(env, "full")) {
for (unsigned i = 0; i < SPEW_COUNT; i++)
active[i] = true;
}
#endif
}
return active[channel];
}
#ifdef DEBUG
static bool InferSpewColorable()
{
#if defined(STARBOARD)
return false;
#else
/* Only spew colors on xterm-color to not screw up emacs. */
static bool colorable = false;
static bool checked = false;
if (!checked) {
checked = true;
const char *env = getenv("TERM");
if (!env)
return false;
if (strcmp(env, "xterm-color") == 0 || strcmp(env, "xterm-256color") == 0)
colorable = true;
}
return colorable;
#endif
}
const char *
types::InferSpewColorReset()
{
if (!InferSpewColorable())
return "";
return "\x1b[0m";
}
const char *
types::InferSpewColor(TypeConstraint *constraint)
{
/* Type constraints are printed out using foreground colors. */
static const char * const colors[] = { "\x1b[31m", "\x1b[32m", "\x1b[33m",
"\x1b[34m", "\x1b[35m", "\x1b[36m",
"\x1b[37m" };
if (!InferSpewColorable())
return "";
return colors[DefaultHasher<TypeConstraint *>::hash(constraint) % 7];
}
const char *
types::InferSpewColor(TypeSet *types)
{
/* Type sets are printed out using bold colors. */
static const char * const colors[] = { "\x1b[1;31m", "\x1b[1;32m", "\x1b[1;33m",
"\x1b[1;34m", "\x1b[1;35m", "\x1b[1;36m",
"\x1b[1;37m" };
if (!InferSpewColorable())
return "";
return colors[DefaultHasher<TypeSet *>::hash(types) % 7];
}
const char *
types::TypeString(Type type)
{
if (type.isPrimitive()) {
switch (type.primitive()) {
case JSVAL_TYPE_UNDEFINED:
return "void";
case JSVAL_TYPE_NULL:
return "null";
case JSVAL_TYPE_BOOLEAN:
return "bool";
case JSVAL_TYPE_INT32:
return "int";
case JSVAL_TYPE_DOUBLE:
return "float";
case JSVAL_TYPE_STRING:
return "string";
case JSVAL_TYPE_MAGIC:
return "lazyargs";
default:
JS_NOT_REACHED("Bad type");
return "";
}
}
if (type.isUnknown())
return "unknown";
if (type.isAnyObject())
return " object";
static char bufs[4][40];
static unsigned which = 0;
which = (which + 1) & 3;
if (type.isSingleObject())
JS_snprintf(bufs[which], 40, "<0x%p>", (void *) type.singleObject());
else
JS_snprintf(bufs[which], 40, "[0x%p]", (void *) type.typeObject());
return bufs[which];
}
const char *
types::TypeObjectString(TypeObject *type)
{
return TypeString(Type::ObjectType(type));
}
unsigned JSScript::id() {
if (!id_) {
id_ = ++compartment()->types.scriptCount;
InferSpew(ISpewOps, "script #%u: %p %s:%d",
id_, this, filename() ? filename() : "<null>", lineno);
}
return id_;
}
void
types::InferSpew(SpewChannel channel, const char *fmt, ...)
{
if (!InferSpewActive(channel))
return;
va_list ap;
va_start(ap, fmt);
fprintf(stdout, "[infer] ");
vfprintf(stdout, fmt, ap);
fprintf(stdout, "\n");
va_end(ap);
}
bool
types::TypeHasProperty(JSContext *cx, TypeObject *obj, jsid id, const Value &value)
{
/*
* Check the correctness of the type information in the object's property
* against an actual value.
*/
if (cx->typeInferenceEnabled() && !obj->unknownProperties() && !value.isUndefined()) {
id = IdToTypeId(id);
/* Watch for properties which inference does not monitor. */
if (id == id___proto__(cx) || id == id_constructor(cx) || id == id_caller(cx))
return true;
/*
* If we called in here while resolving a type constraint, we may be in the
* middle of resolving a standard class and the type sets will not be updated
* until the outer TypeSet::add finishes.
*/
if (cx->compartment()->types.pendingCount)
return true;
Type type = GetValueType(cx, value);
AutoEnterAnalysis enter(cx);
/*
* We don't track types for properties inherited from prototypes which
* haven't yet been accessed during analysis of the inheriting object.
* Don't do the property instantiation now.
*/
TypeSet *types = obj->maybeGetProperty(id, cx);
if (!types)
return true;
/*
* If the types inherited from prototypes are not being propagated into
* this set (because we haven't analyzed code which accesses the
* property), skip.
*/
if (!types->hasPropagatedProperty())
return true;
if (!types->hasType(type)) {
TypeFailure(cx, "Missing type in object %s %s: %s",
TypeObjectString(obj), TypeIdString(id), TypeString(type));
}
}
return true;
}
#endif
void
types::TypeFailure(JSContext *cx, const char *fmt, ...)
{
char msgbuf[1024]; /* Larger error messages will be truncated */
char errbuf[1024];
va_list ap;
va_start(ap, fmt);
JS_vsnprintf(errbuf, sizeof(errbuf), fmt, ap);
va_end(ap);
JS_snprintf(msgbuf, sizeof(msgbuf), "[infer failure] %s", errbuf);
/* Dump type state, even if INFERFLAGS is unset. */
cx->compartment()->types.print(cx, true);
MOZ_ReportAssertionFailure(msgbuf, __FILE__, __LINE__);
MOZ_CRASH();
}
/////////////////////////////////////////////////////////////////////
// TypeSet
/////////////////////////////////////////////////////////////////////
TypeSet::TypeSet(Type type)
: flags(0), objectSet(NULL), constraintList(NULL)
{
if (type.isUnknown()) {
flags |= TYPE_FLAG_BASE_MASK;
} else if (type.isPrimitive()) {
flags = PrimitiveTypeFlag(type.primitive());
if (flags == TYPE_FLAG_DOUBLE)
flags |= TYPE_FLAG_INT32;
} else if (type.isAnyObject()) {
flags |= TYPE_FLAG_ANYOBJECT;
} else if (type.isTypeObject() && type.typeObject()->unknownProperties()) {
flags |= TYPE_FLAG_ANYOBJECT;
} else {
setBaseObjectCount(1);
objectSet = reinterpret_cast<TypeObjectKey**>(type.objectKey());
}
}
bool
TypeSet::isSubset(TypeSet *other)
{
if ((baseFlags() & other->baseFlags()) != baseFlags())
return false;
if (unknownObject()) {
JS_ASSERT(other->unknownObject());
} else {
for (unsigned i = 0; i < getObjectCount(); i++) {
TypeObjectKey *obj = getObject(i);
if (!obj)
continue;
if (!other->hasType(Type::ObjectType(obj)))
return false;
}
}
return true;
}
bool
TypeSet::isSubsetIgnorePrimitives(TypeSet *other)
{
TypeFlags otherFlags = other->baseFlags() | TYPE_FLAG_PRIMITIVE;
if ((baseFlags() & otherFlags) != baseFlags())
return false;
if (unknownObject()) {
JS_ASSERT(other->unknownObject());
} else {
for (unsigned i = 0; i < getObjectCount(); i++) {
TypeObjectKey *obj = getObject(i);
if (!obj)
continue;
if (!other->hasType(Type::ObjectType(obj)))
return false;
}
}
return true;
}
bool
TypeSet::intersectionEmpty(TypeSet *other)
{
// For unknown/unknownObject there is no reason they couldn't intersect.
// I.e. we eagerly return their intersection isn't empty.
// That's ok, since we can't make predictions that can be checked to not hold.
if (unknown() || other->unknown())
return false;
if (unknownObject() && other->unknownObject())
return false;
if (unknownObject() && other->getObjectCount() > 0)
return false;
if (other->unknownObject() && getObjectCount() > 0)
return false;
// Test if there is an intersection in the baseFlags
if ((baseFlags() & other->baseFlags()) != 0)
return false;
// Test if there are object that are in both TypeSets
if (!unknownObject()) {
for (unsigned i = 0; i < getObjectCount(); i++) {
TypeObjectKey *obj = getObject(i);
if (!obj)
continue;
if (other->hasType(Type::ObjectType(obj)))
return false;
}
}
return true;
}
inline void
TypeSet::addTypesToConstraint(JSContext *cx, TypeConstraint *constraint)
{
/*
* Build all types in the set into a vector before triggering the
* constraint, as doing so may modify this type set.
*/
Vector<Type> types(cx);
/* If any type is possible, there's no need to worry about specifics. */
if (flags & TYPE_FLAG_UNKNOWN) {
if (!types.append(Type::UnknownType()))
cx->compartment()->types.setPendingNukeTypes(cx);
} else {
/* Enqueue type set members stored as bits. */
for (TypeFlags flag = 1; flag < TYPE_FLAG_ANYOBJECT; flag <<= 1) {
if (flags & flag) {
Type type = Type::PrimitiveType(TypeFlagPrimitive(flag));
if (!types.append(type))
cx->compartment()->types.setPendingNukeTypes(cx);
}
}
/* If any object is possible, skip specifics. */
if (flags & TYPE_FLAG_ANYOBJECT) {
if (!types.append(Type::AnyObjectType()))
cx->compartment()->types.setPendingNukeTypes(cx);
} else {
/* Enqueue specific object types. */
unsigned count = getObjectCount();
for (unsigned i = 0; i < count; i++) {
TypeObjectKey *object = getObject(i);
if (object) {
if (!types.append(Type::ObjectType(object)))
cx->compartment()->types.setPendingNukeTypes(cx);
}
}
}
}
for (unsigned i = 0; i < types.length(); i++)
constraint->newType(cx, this, types[i]);
}
inline void
TypeSet::add(JSContext *cx, TypeConstraint *constraint, bool callExisting)
{
if (!constraint) {
/* OOM failure while constructing the constraint. */
cx->compartment()->types.setPendingNukeTypes(cx);
return;
}
JS_ASSERT(cx->compartment()->activeAnalysis);
InferSpew(ISpewOps, "addConstraint: %sT%p%s %sC%p%s %s",
InferSpewColor(this), this, InferSpewColorReset(),
InferSpewColor(constraint), constraint, InferSpewColorReset(),
constraint->kind());
JS_ASSERT(constraint->next == NULL);
constraint->next = constraintList;
constraintList = constraint;
if (callExisting)
addTypesToConstraint(cx, constraint);
}
void
TypeSet::print()
{
if (flags & TYPE_FLAG_OWN_PROPERTY)
printf(" [own]");
if (flags & TYPE_FLAG_CONFIGURED_PROPERTY)
printf(" [configured]");
if (definiteProperty())
printf(" [definite:%d]", definiteSlot());
if (baseFlags() == 0 && !baseObjectCount()) {
printf(" missing");
return;
}
if (flags & TYPE_FLAG_UNKNOWN)
printf(" unknown");
if (flags & TYPE_FLAG_ANYOBJECT)
printf(" object");
if (flags & TYPE_FLAG_UNDEFINED)
printf(" void");
if (flags & TYPE_FLAG_NULL)
printf(" null");
if (flags & TYPE_FLAG_BOOLEAN)
printf(" bool");
if (flags & TYPE_FLAG_INT32)
printf(" int");
if (flags & TYPE_FLAG_DOUBLE)
printf(" float");
if (flags & TYPE_FLAG_STRING)
printf(" string");
if (flags & TYPE_FLAG_LAZYARGS)
printf(" lazyargs");
uint32_t objectCount = baseObjectCount();
if (objectCount) {
printf(" object[%u]", objectCount);
unsigned count = getObjectCount();
for (unsigned i = 0; i < count; i++) {
TypeObjectKey *object = getObject(i);
if (object)
printf(" %s", TypeString(Type::ObjectType(object)));
}
}
}
StackTypeSet *
StackTypeSet::make(JSContext *cx, const char *name)
{
JS_ASSERT(cx->compartment()->activeAnalysis);
StackTypeSet *res = cx->analysisLifoAlloc().new_<StackTypeSet>();
if (!res) {
cx->compartment()->types.setPendingNukeTypes(cx);
return NULL;
}
InferSpew(ISpewOps, "typeSet: %sT%p%s intermediate %s",
InferSpewColor(res), res, InferSpewColorReset(),
name);
res->setPurged();
return res;
}
StackTypeSet *
TypeSet::clone(LifoAlloc *alloc) const
{
unsigned objectCount = baseObjectCount();
unsigned capacity = (objectCount >= 2) ? HashSetCapacity(objectCount) : 0;
StackTypeSet *res = alloc->new_<StackTypeSet>();
if (!res)
return NULL;
TypeObjectKey **newSet;
if (capacity) {
newSet = alloc->newArray<TypeObjectKey*>(capacity);
if (!newSet)
return NULL;
PodCopy(newSet, objectSet, capacity);
}
res->flags = this->flags;
res->objectSet = capacity ? newSet : this->objectSet;
return res;
}
bool
TypeSet::addObject(TypeObjectKey *key, LifoAlloc *alloc)
{
JS_ASSERT(!constraintList);
uint32_t objectCount = baseObjectCount();
TypeObjectKey **pentry = HashSetInsert<TypeObjectKey *,TypeObjectKey,TypeObjectKey>
(*alloc, objectSet, objectCount, key);
if (!pentry)
return false;
if (*pentry)
return true;
*pentry = key;
setBaseObjectCount(objectCount);
if (objectCount == TYPE_FLAG_OBJECT_COUNT_LIMIT) {
flags |= TYPE_FLAG_ANYOBJECT;
clearObjects();
}
return true;
}
/* static */ StackTypeSet *
TypeSet::unionSets(TypeSet *a, TypeSet *b, LifoAlloc *alloc)
{
StackTypeSet *res = alloc->new_<StackTypeSet>();
if (!res)
return NULL;
res->flags = a->baseFlags() | b->baseFlags();
if (!res->unknownObject()) {
for (size_t i = 0; i < a->getObjectCount() && !res->unknownObject(); i++) {
TypeObjectKey *key = a->getObject(i);
if (key && !res->addObject(key, alloc))
return NULL;
}
for (size_t i = 0; i < b->getObjectCount() && !res->unknownObject(); i++) {
TypeObjectKey *key = b->getObject(i);
if (key && !res->addObject(key, alloc))
return NULL;
}
}
return res;
}
/////////////////////////////////////////////////////////////////////
// TypeSet constraints
/////////////////////////////////////////////////////////////////////
/* Standard subset constraint, propagate all types from one set to another. */
class TypeConstraintSubset : public TypeConstraint
{
public:
TypeSet *target;
TypeConstraintSubset(TypeSet *target)
: target(target)
{
JS_ASSERT(target);
}
const char *kind() { return "subset"; }
void newType(JSContext *cx, TypeSet *source, Type type)
{
/* Basic subset constraint, move all types to the target. */
target->addType(cx, type);
}
};
void
StackTypeSet::addSubset(JSContext *cx, TypeSet *target)
{
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintSubset>(target));
}
void
HeapTypeSet::addSubset(JSContext *cx, TypeSet *target)
{
JS_ASSERT(!target->purged());
add(cx, cx->typeLifoAlloc().new_<TypeConstraintSubset>(target));
}
enum PropertyAccessKind {
PROPERTY_WRITE,
PROPERTY_READ,
PROPERTY_READ_EXISTING
};
/* Constraints for reads/writes on object properties. */
template <PropertyAccessKind access>
class TypeConstraintProp : public TypeConstraint
{
JSScript *script_;
public:
jsbytecode *pc;
/*
* If assign is true, the target is used to update a property of the object.
* If assign is false, the target is assigned the value of the property.
*/
StackTypeSet *target;
/* Property being accessed. This is unrooted. */
jsid id;
TypeConstraintProp(JSScript *script, jsbytecode *pc, StackTypeSet *target, jsid id)
: script_(script), pc(pc), target(target), id(id)
{
JS_ASSERT(script && pc && target);
}
const char *kind() { return "prop"; }
void newType(JSContext *cx, TypeSet *source, Type type);
};
typedef TypeConstraintProp<PROPERTY_WRITE> TypeConstraintSetProperty;
typedef TypeConstraintProp<PROPERTY_READ> TypeConstraintGetProperty;
typedef TypeConstraintProp<PROPERTY_READ_EXISTING> TypeConstraintGetPropertyExisting;
void
StackTypeSet::addGetProperty(JSContext *cx, JSScript *script, jsbytecode *pc,
StackTypeSet *target, jsid id)
{
/*
* GetProperty constraints are normally used with property read input type
* sets, except for array_pop/array_shift special casing.
*/
JS_ASSERT(js_CodeSpec[*pc].format & JOF_INVOKE);
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintGetProperty>(script, pc, target, id));
}
void
StackTypeSet::addSetProperty(JSContext *cx, JSScript *script, jsbytecode *pc,
StackTypeSet *target, jsid id)
{
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintSetProperty>(script, pc, target, id));
}
void
HeapTypeSet::addGetProperty(JSContext *cx, JSScript *script, jsbytecode *pc,
StackTypeSet *target, jsid id)
{
JS_ASSERT(!target->purged());
add(cx, cx->typeLifoAlloc().new_<TypeConstraintGetProperty>(script, pc, target, id));
}
/*
* Constraints for updating the 'this' types of callees on CALLPROP/CALLELEM.
* These are derived from the types on the properties themselves, rather than
* those pushed in the 'this' slot at the call site, which allows us to retain
* correlations between the type of the 'this' object and the associated
* callee scripts at polymorphic call sites.
*/
template <PropertyAccessKind access>
class TypeConstraintCallProp : public TypeConstraint
{
JSScript *script_;
public:
jsbytecode *callpc;
/* Property being accessed. */
jsid id;
TypeConstraintCallProp(JSScript *script, jsbytecode *callpc, jsid id)
: script_(script), callpc(callpc), id(id)
{
JS_ASSERT(script && callpc);
}
const char *kind() { return "callprop"; }
void newType(JSContext *cx, TypeSet *source, Type type);
};
typedef TypeConstraintCallProp<PROPERTY_READ> TypeConstraintCallProperty;
typedef TypeConstraintCallProp<PROPERTY_READ_EXISTING> TypeConstraintCallPropertyExisting;
void
HeapTypeSet::addCallProperty(JSContext *cx, JSScript *script, jsbytecode *pc, jsid id)
{
/*
* For calls which will go through JSOP_NEW, don't add any constraints to
* modify the 'this' types of callees. The initial 'this' value will be
* outright ignored.
*/
jsbytecode *callpc = script->analysis()->getCallPC(pc);
if (JSOp(*callpc) == JSOP_NEW)
return;
add(cx, cx->typeLifoAlloc().new_<TypeConstraintCallProperty>(script, callpc, id));
}
/*
* Constraints for generating 'set' property constraints on a SETELEM only if
* the element type may be a number. For SETELEM we only account for integer
* indexes, and if the element cannot be an integer (e.g. it must be a string)
* then we lose precision by treating it like one.
*/
class TypeConstraintSetElement : public TypeConstraint
{
JSScript *script_;
public:
jsbytecode *pc;
StackTypeSet *objectTypes;
StackTypeSet *valueTypes;
TypeConstraintSetElement(JSScript *script, jsbytecode *pc,
StackTypeSet *objectTypes, StackTypeSet *valueTypes)
: script_(script), pc(pc),
objectTypes(objectTypes), valueTypes(valueTypes)
{
JS_ASSERT(script && pc);
}
const char *kind() { return "setelement"; }
void newType(JSContext *cx, TypeSet *source, Type type);
};
void
StackTypeSet::addSetElement(JSContext *cx, JSScript *script, jsbytecode *pc,
StackTypeSet *objectTypes, StackTypeSet *valueTypes)
{
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintSetElement>(script, pc, objectTypes,
valueTypes));
}
/*
* Constraints for watching call edges as they are discovered and invoking native
* function handlers, adding constraints for arguments, receiver objects and the
* return value, and updating script foundOffsets.
*/
class TypeConstraintCall : public TypeConstraint
{
public:
/* Call site being tracked. */
TypeCallsite *callsite;
TypeConstraintCall(TypeCallsite *callsite)
: callsite(callsite)
{}
const char *kind() { return "call"; }
void newType(JSContext *cx, TypeSet *source, Type type);
};
void
StackTypeSet::addCall(JSContext *cx, TypeCallsite *site)
{
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintCall>(site));
}
/* Constraints for arithmetic operations. */
class TypeConstraintArith : public TypeConstraint
{
JSScript *script_;
public:
jsbytecode *pc;
/* Type set receiving the result of the arithmetic. */
TypeSet *target;
/* For addition operations, the other operand. */
TypeSet *other;
TypeConstraintArith(JSScript *script, jsbytecode *pc, TypeSet *target, TypeSet *other)
: script_(script), pc(pc), target(target), other(other)
{
JS_ASSERT(target);
}
const char *kind() { return "arith"; }
void newType(JSContext *cx, TypeSet *source, Type type);
};
void
StackTypeSet::addArith(JSContext *cx, JSScript *script, jsbytecode *pc, TypeSet *target,
TypeSet *other)
{
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintArith>(script, pc, target, other));
}
/* Subset constraint which transforms primitive values into appropriate objects. */
class TypeConstraintTransformThis : public TypeConstraint
{
JSScript *script_;
public:
TypeSet *target;
TypeConstraintTransformThis(JSScript *script, TypeSet *target)
: script_(script), target(target)
{}
const char *kind() { return "transformthis"; }
void newType(JSContext *cx, TypeSet *source, Type type);
};
void
StackTypeSet::addTransformThis(JSContext *cx, JSScript *script, TypeSet *target)
{
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintTransformThis>(script, target));
}
/*
* Constraint which adds a particular type to the 'this' types of all
* discovered scripted functions.
*/
class TypeConstraintPropagateThis : public TypeConstraint
{
JSScript *script_;
public:
jsbytecode *callpc;
Type type;
StackTypeSet *types;
TypeConstraintPropagateThis(JSScript *script, jsbytecode *callpc, Type type, StackTypeSet *types)
: script_(script), callpc(callpc), type(type), types(types)
{}
const char *kind() { return "propagatethis"; }
void newType(JSContext *cx, TypeSet *source, Type type);
};
void
StackTypeSet::addPropagateThis(JSContext *cx, JSScript *script, jsbytecode *pc,
Type type, StackTypeSet *types)
{
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintPropagateThis>(script, pc, type, types));
}
/* Subset constraint which filters out primitive types. */
class TypeConstraintFilterPrimitive : public TypeConstraint
{
public:
TypeSet *target;
TypeConstraintFilterPrimitive(TypeSet *target)
: target(target)
{}
const char *kind() { return "filter"; }
void newType(JSContext *cx, TypeSet *source, Type type)
{
if (type.isPrimitive())
return;
target->addType(cx, type);
}
};
void
HeapTypeSet::addFilterPrimitives(JSContext *cx, TypeSet *target)
{
add(cx, cx->typeLifoAlloc().new_<TypeConstraintFilterPrimitive>(target));
}
/* If id is a normal slotful 'own' property of an object, get its shape. */
static inline Shape *
GetSingletonShape(JSContext *cx, JSObject *obj, jsid idArg)
{
if (!obj->isNative())
return NULL;
RootedId id(cx, idArg);
Shape *shape = obj->nativeLookup(cx, id);
if (shape && shape->hasDefaultGetter() && shape->hasSlot())
return shape;
return NULL;
}
void
ScriptAnalysis::pruneTypeBarriers(JSContext *cx, uint32_t offset)
{
TypeBarrier **pbarrier = &getCode(offset).typeBarriers;
while (*pbarrier) {
TypeBarrier *barrier = *pbarrier;
if (barrier->target->hasType(barrier->type)) {
/* Barrier is now obsolete, it can be removed. */
*pbarrier = barrier->next;
continue;
}
if (barrier->singleton) {
JS_ASSERT(barrier->type.isPrimitive(JSVAL_TYPE_UNDEFINED));
Shape *shape = GetSingletonShape(cx, barrier->singleton, barrier->singletonId);
if (shape && !barrier->singleton->nativeGetSlot(shape->slot()).isUndefined()) {
/*
* When we analyzed the script the singleton had an 'own'
* property which was undefined (probably a 'var' variable
* added to a global object), but now it is defined. The only
* way it can become undefined again is if an explicit assign
* or deletion on the property occurs, which will update the
* type set for the property directly and trigger construction
* of a normal type barrier.
*/
*pbarrier = barrier->next;
continue;
}
}
pbarrier = &barrier->next;
}
}
/*
* Cheesy limit on the number of objects we will tolerate in an observed type
* set before refusing to add new type barriers for objects.
* :FIXME: this heuristic sucks, and doesn't handle calls.
*/
static const uint32_t BARRIER_OBJECT_LIMIT = 10;
void ScriptAnalysis::breakTypeBarriers(JSContext *cx, uint32_t offset, bool all)
{
pruneTypeBarriers(cx, offset);
bool resetResolving = !cx->compartment()->types.resolving;
if (resetResolving)
cx->compartment()->types.resolving = true;
TypeBarrier **pbarrier = &getCode(offset).typeBarriers;
while (*pbarrier) {
TypeBarrier *barrier = *pbarrier;
if (barrier->target->hasType(barrier->type) ) {
/*
* Barrier is now obsolete, it can be removed. This is not
* redundant with the pruneTypeBarriers() call above, as breaking
* previous type barriers may have modified the target type set.
*/
*pbarrier = barrier->next;
} else if (all) {
/* Force removal of the barrier. */
barrier->target->addType(cx, barrier->type);
*pbarrier = barrier->next;
} else if (!barrier->type.isUnknown() &&
!barrier->type.isAnyObject() &&
barrier->type.isObject() &&
barrier->target->getObjectCount() >= BARRIER_OBJECT_LIMIT) {
/* Maximum number of objects in the set exceeded. */
barrier->target->addType(cx, barrier->type);
*pbarrier = barrier->next;
} else {
pbarrier = &barrier->next;
}
}
if (resetResolving) {
cx->compartment()->types.resolving = false;
cx->compartment()->types.resolvePending(cx);
}
}
void ScriptAnalysis::breakTypeBarriersSSA(JSContext *cx, const SSAValue &v)
{
if (v.kind() != SSAValue::PUSHED)
return;
uint32_t offset = v.pushedOffset();
if (JSOp(script_->code[offset]) == JSOP_GETPROP)
breakTypeBarriersSSA(cx, poppedValue(offset, 0));
breakTypeBarriers(cx, offset, true);
}
/*
* Subset constraint for property reads and argument passing which can add type
* barriers on the read instead of passing types along.
*/
class TypeConstraintSubsetBarrier : public TypeConstraint
{
public:
JSScript *script;
jsbytecode *pc;
TypeSet *target;
TypeConstraintSubsetBarrier(JSScript *script, jsbytecode *pc, TypeSet *target)
: script(script), pc(pc), target(target)
{}
const char *kind() { return "subsetBarrier"; }
void newType(JSContext *cx, TypeSet *source, Type type)
{
if (!target->hasType(type)) {
if (!script->ensureRanAnalysis(cx))
return;
script->analysis()->addTypeBarrier(cx, pc, target, type);
}
}
};
void
StackTypeSet::addSubsetBarrier(JSContext *cx, JSScript *script, jsbytecode *pc, TypeSet *target)
{
add(cx, cx->analysisLifoAlloc().new_<TypeConstraintSubsetBarrier>(script, pc, target));
}
void
HeapTypeSet::addSubsetBarrier(JSContext *cx, JSScript *script, jsbytecode *pc, TypeSet *target)
{
JS_ASSERT(!target->purged());
add(cx, cx->typeLifoAlloc().new_<TypeConstraintSubsetBarrier>(script, pc, target));
}
/////////////////////////////////////////////////////////////////////
// TypeConstraint
/////////////////////////////////////////////////////////////////////
/* Get the object to use for a property access on type. */
static inline TypeObject *
GetPropertyObject(JSContext *cx, HandleScript script, Type type)
{
if (type.isTypeObject())
return type.typeObject();
/* Force instantiation of lazy types for singleton objects. */
if (type.isSingleObject())
return type.singleObject()->getType(cx);
/*
* Handle properties attached to primitive types, treating this access as a
* read on the primitive's new object.
*/
TypeObject *object = NULL;
switch (type.primitive()) {
case JSVAL_TYPE_INT32:
case JSVAL_TYPE_DOUBLE:
object = TypeScript::StandardType(cx, JSProto_Number);
break;
case JSVAL_TYPE_BOOLEAN:
object = TypeScript::StandardType(cx, JSProto_Boolean);
break;
case JSVAL_TYPE_STRING:
object = TypeScript::StandardType(cx, JSProto_String);
break;
default:
/* undefined, null and lazy arguments do not have properties. */
return NULL;
}
if (!object)
cx->compartment()->types.setPendingNukeTypes(cx);
return object;
}
static inline bool
UsePropertyTypeBarrier(jsbytecode *pc)
{
/*
* At call opcodes, type barriers can only be added for the call bindings,
* which TypeConstraintCall will add barrier constraints for directly.
*/
uint32_t format = js_CodeSpec[*pc].format;
return (format & JOF_TYPESET) && !(format & JOF_INVOKE);
}
static inline void
MarkPropertyAccessUnknown(JSContext *cx, JSScript *script, jsbytecode *pc, TypeSet *target)
{
if (UsePropertyTypeBarrier(pc))
script->analysis()->addTypeBarrier(cx, pc, target, Type::UnknownType());
else
target->addType(cx, Type::UnknownType());
}
/*
* Get a value for reading id from obj or its prototypes according to the
* current VM state, returning the unknown type on failure or an undefined
* property.
*/
static inline Type
GetSingletonPropertyType(JSContext *cx, JSObject *rawObjArg, HandleId id)
{
RootedObject obj(cx, rawObjArg); // Root this locally because it's assigned to.
JS_ASSERT(id == IdToTypeId(id));
if (JSID_IS_VOID(id))
return Type::UnknownType();
if (obj->isTypedArray()) {
if (id == id_length(cx))
return Type::Int32Type();
obj = obj->getProto();
}
while (obj) {
if (!obj->isNative())
return Type::UnknownType();
RootedValue v(cx);
if (HasDataProperty(cx, obj, id, v.address())) {
if (v.isUndefined())
return Type::UnknownType();
return GetValueType(cx, v);
}
obj = obj->getProto();
}
return Type::UnknownType();
}
/*
* Handle a property access on a specific object. All property accesses go through
* here, whether via x.f, x[f], or global name accesses.
*/
template <PropertyAccessKind access>
static inline void
PropertyAccess(JSContext *cx, JSScript *script, jsbytecode *pc, TypeObject *object,
StackTypeSet *target, jsid idArg)
{
RootedId id(cx, idArg);
/* Reads from objects with unknown properties are unknown, writes to such objects are ignored. */
if (object->unknownProperties()) {
if (access != PROPERTY_WRITE)
MarkPropertyAccessUnknown(cx, script, pc, target);
return;
}
/*
* Get the possible types of the property. For assignments, we do not
* automatically update the 'own' bit on accessed properties, except for
* indexed elements. This exception allows for JIT fast paths to avoid
* testing the array's type when assigning to dense array elements.
*/
bool markOwn = access == PROPERTY_WRITE && JSID_IS_VOID(id);
HeapTypeSet *types = object->getProperty(cx, id, markOwn);
if (!types)
return;
/* Capture the effects of a standard property access. */
if (access == PROPERTY_WRITE) {
target->addSubset(cx, types);
} else {
JS_ASSERT_IF(script->hasAnalysis(),
target == TypeScript::BytecodeTypes(script, pc));
if (!types->hasPropagatedProperty())
object->getFromPrototypes(cx, id, types);
if (UsePropertyTypeBarrier(pc)) {
if (access == PROPERTY_READ) {
types->addSubsetBarrier(cx, script, pc, target);
} else {
TypeConstraintSubsetBarrier constraint(script, pc, target);
types->addTypesToConstraint(cx, &constraint);
}
if (object->singleton && !JSID_IS_VOID(id)) {
/*
* Add a singleton type barrier on the object if it has an
* 'own' property which is currently undefined. We'll be able
* to remove the barrier after the property becomes defined,
* even if no undefined value is ever observed at pc.
*/
RootedObject singleton(cx, object->singleton);
RootedShape shape(cx, GetSingletonShape(cx, singleton, id));
if (shape && singleton->nativeGetSlot(shape->slot()).isUndefined())
script->analysis()->addSingletonTypeBarrier(cx, pc, target, singleton, id);
}
} else {
JS_ASSERT(access == PROPERTY_READ);
types->addSubset(cx, target);
}
}
}
/* Whether the JSObject/TypeObject referent of an access on type cannot be determined. */
static inline bool
UnknownPropertyAccess(HandleScript script, Type type)
{
return type.isUnknown()
|| type.isAnyObject()
|| (!type.isObject() && !script->compileAndGo);
}
template <PropertyAccessKind access>
void
TypeConstraintProp<access>::newType(JSContext *cx, TypeSet *source, Type type)
{
RootedScript script(cx, script_);
if (UnknownPropertyAccess(script, type)) {
/*
* Access on an unknown object. Reads produce an unknown result, writes
* need to be monitored.
*/
if (access == PROPERTY_WRITE)
cx->compartment()->types.monitorBytecode(cx, script, pc - script->code);
else
MarkPropertyAccessUnknown(cx, script, pc, target);
return;
}
if (type.isPrimitive(JSVAL_TYPE_MAGIC)) {
/* Ignore cases which will be accounted for by the followEscapingArguments analysis. */
if (access == PROPERTY_WRITE || (id != JSID_VOID && id != id_length(cx)))
return;
if (id == JSID_VOID)
MarkPropertyAccessUnknown(cx, script, pc, target);
return;
}
TypeObject *object = GetPropertyObject(cx, script, type);
if (object)
PropertyAccess<access>(cx, script, pc, object, target, id);
}
template <PropertyAccessKind access>
void
TypeConstraintCallProp<access>::newType(JSContext *cx, TypeSet *source, Type type)
{
RootedScript script(cx, script_);
/*
* For CALLPROP, we need to update not just the pushed types but also the
* 'this' types of possible callees. If we can't figure out that set of
* callees, monitor the call to make sure discovered callees get their
* 'this' types updated.
*/
if (UnknownPropertyAccess(script, type)) {
cx->compartment()->types.monitorBytecode(cx, script, callpc - script->code);
return;
}
TypeObject *object = GetPropertyObject(cx, script, type);
if (object) {
if (object->unknownProperties()) {
cx->compartment()->types.monitorBytecode(cx, script, callpc - script->code);
} else {
TypeSet *types = object->getProperty(cx, id, false);
if (!types)
return;
if (!types->hasPropagatedProperty())
object->getFromPrototypes(cx, id, types);
if (access == PROPERTY_READ) {
types->add(cx, cx->typeLifoAlloc().new_<TypeConstraintPropagateThis>(
script_, callpc, type, (StackTypeSet *) NULL));
} else {
TypeConstraintPropagateThis constraint(script, callpc, type, NULL);
types->addTypesToConstraint(cx, &constraint);
}
}
}
}
void
TypeConstraintSetElement::newType(JSContext *cx, TypeSet *source, Type type)
{
RootedScript script(cx, script_);
if (type.isUnknown() ||
type.isPrimitive(JSVAL_TYPE_INT32) ||
type.isPrimitive(JSVAL_TYPE_DOUBLE)) {
objectTypes->addSetProperty(cx, script, pc, valueTypes, JSID_VOID);
}
}
static inline JSFunction *
CloneCallee(JSContext *cx, HandleFunction fun, HandleScript script, jsbytecode *pc)
{
/*
* Clone called functions at appropriate callsites to match interpreter
* behavior.
*/
JSFunction *callee = CloneFunctionAtCallsite(cx, fun, script, pc);
if (!callee)
return NULL;
InferSpew(ISpewOps, "callsiteCloneType: #%u:%05u: %s",
script->id(), pc - script->code, TypeString(Type::ObjectType(callee)));
return callee;
}
void
TypeConstraintCall::newType(JSContext *cx, TypeSet *source, Type type)
{
RootedScript script(cx, callsite->script);
jsbytecode *pc = callsite->pc;
JS_ASSERT_IF(script->hasAnalysis(),
callsite->returnTypes == TypeScript::BytecodeTypes(script, pc));
if (type.isUnknown() || type.isAnyObject()) {
/* Monitor calls on unknown functions. */
cx->compartment()->types.monitorBytecode(cx, script, pc - script->code);
return;
}
RootedFunction callee(cx);
if (type.isSingleObject()) {
RootedObject obj(cx, type.singleObject());
if (!obj->is<JSFunction>()) {
/* Calls on non-functions are dynamically monitored. */
return;
}
if (obj->as<JSFunction>().isNative()) {
/*
* The return value and all side effects within native calls should
* be dynamically monitored, except when the compiler is generating
* specialized inline code or stub calls for a specific natives and
* knows about the behavior of that native.
*/
cx->compartment()->types.monitorBytecode(cx, script, pc - script->code, true);
/*
* Add type constraints capturing the possible behavior of
* specialized natives which operate on properties. :XXX: use
* better factoring for both this and the compiler code itself
* which specializes particular natives.
*/
Native native = obj->as<JSFunction>().native();
if (native == js::array_push) {
for (size_t i = 0; i < callsite->argumentCount; i++) {
callsite->thisTypes->addSetProperty(cx, script, pc,
callsite->argumentTypes[i], JSID_VOID);
}
}
if (native == intrinsic_UnsafeSetElement) {
// UnsafeSetElement(arr0, idx0, elem0, ..., arrN, idxN, elemN)
// is (basically) equivalent to arri[idxi] = elemi for i = 0...N
JS_ASSERT((callsite->argumentCount % 3) == 0);
for (size_t i = 0; i < callsite->argumentCount; i += 3) {
StackTypeSet *arr = callsite->argumentTypes[i];
StackTypeSet *elem = callsite->argumentTypes[i+2];
arr->addSetProperty(cx, script, pc, elem, JSID_VOID);
}
}
if (native == js::array_pop || native == js::array_shift)
callsite->thisTypes->addGetProperty(cx, script, pc, callsite->returnTypes, JSID_VOID);
if (native == js_Array) {
TypeObject *res = TypeScript::InitObject(cx, script, pc, JSProto_Array);
if (!res)
return;
callsite->returnTypes->addType(cx, Type::ObjectType(res));
if (callsite->argumentCount >= 2) {
for (unsigned i = 0; i < callsite->argumentCount; i++) {
PropertyAccess<PROPERTY_WRITE>(cx, script, pc, res,
callsite->argumentTypes[i], JSID_VOID);
}
}
}
if (native == js_String && callsite->isNew) {
// Note that "new String()" returns a String object and "String()"
// returns a primitive string.
TypeObject *res = TypeScript::StandardType(cx, JSProto_String);
if (!res)
return;
callsite->returnTypes->addType(cx, Type::ObjectType(res));
}
return;
}
callee = &obj->as<JSFunction>();
} else if (type.isTypeObject()) {
callee = type.typeObject()->interpretedFunction;
if (!callee)
return;
} else {
/* Calls on non-objects are dynamically monitored. */
return;
}
if (callee->isInterpretedLazy() && !callee->getOrCreateScript(cx))
return;
/*
* As callsite cloning is a hint, we must propagate to both the original
* and the clone.
*/
if (callee->nonLazyScript()->shouldCloneAtCallsite) {
callee = CloneCallee(cx, callee, script, pc);
if (!callee)
return;
}
RootedScript calleeScript(cx, callee->nonLazyScript());
if (!calleeScript->ensureHasTypes(cx))
return;
unsigned nargs = callee->nargs;
/* Add bindings for the arguments of the call. */
for (unsigned i = 0; i < callsite->argumentCount && i < nargs; i++) {
StackTypeSet *argTypes = callsite->argumentTypes[i];
StackTypeSet *types = TypeScript::ArgTypes(calleeScript, i);
argTypes->addSubsetBarrier(cx, script, callsite->pc, types);
}
/* Add void type for any formals in the callee not supplied at the call site. */
for (unsigned i = callsite->argumentCount; i < nargs; i++) {
TypeSet *types = TypeScript::ArgTypes(calleeScript, i);
types->addType(cx, Type::UndefinedType());
}
StackTypeSet *thisTypes = TypeScript::ThisTypes(calleeScript);
HeapTypeSet *returnTypes = TypeScript::ReturnTypes(calleeScript);
if (callsite->isNew) {
/*
* If the script does not return a value then the pushed value is the
* new object (typical case). Note that we don't model construction of
* the new value, which is done dynamically; we don't keep track of the
* possible 'new' types for a given prototype type object.
*/
thisTypes->addSubset(cx, returnTypes);
returnTypes->addFilterPrimitives(cx, callsite->returnTypes);
} else {
/*
* Add a binding for the return value of the call. We don't add a
* binding for the receiver object, as this is done with PropagateThis
* constraints added by the original JSOP_CALL* op. The type sets we
* manipulate here have lost any correlations between particular types
* in the 'this' and 'callee' sets, which we want to maintain for
* polymorphic JSOP_CALLPROP invocations.
*/
returnTypes->addSubset(cx, callsite->returnTypes);
}
}
void
TypeConstraintPropagateThis::newType(JSContext *cx, TypeSet *source, Type type)
{
RootedScript script(cx, script_);
if (type.isUnknown() || type.isAnyObject()) {
/*
* The callee is unknown, make sure the call is monitored so we pick up
* possible this/callee correlations. This only comes into play for
* CALLPROP, for other calls we are past the type barrier and a
* TypeConstraintCall will also monitor the call.
*/
cx->compartment()->types.monitorBytecode(cx, script, callpc - script->code);
return;
}
/* Ignore calls to natives, these will be handled by TypeConstraintCall. */
RootedFunction callee(cx);
if (type.isSingleObject()) {
RootedObject object(cx, type.singleObject());
if (!object->is<JSFunction>() || !object->as<JSFunction>().isInterpreted())
return;
callee = &object->as<JSFunction>();
} else if (type.isTypeObject()) {
TypeObject *object = type.typeObject();
if (!object->interpretedFunction)
return;
callee = object->interpretedFunction;
} else {
/* Ignore calls to primitives, these will go through a stub. */
return;
}
if (callee->isInterpretedLazy() && !callee->getOrCreateScript(cx))
return;
/*
* As callsite cloning is a hint, we must propagate to both the original
* and the clone.
*/
if (callee->nonLazyScript()->shouldCloneAtCallsite) {
callee = CloneCallee(cx, callee, script, callpc);
if (!callee)
return;
}
if (!callee->nonLazyScript()->ensureHasTypes(cx))
return;
TypeSet *thisTypes = TypeScript::ThisTypes(callee->nonLazyScript());
if (this->types)
this->types->addSubset(cx, thisTypes);
else
thisTypes->addType(cx, this->type);
}
void
TypeConstraintArith::newType(JSContext *cx, TypeSet *source, Type type)
{
/*
* We only model a subset of the arithmetic behavior that is actually
* possible. The following need to be watched for at runtime:
*
* 1. Operations producing a double where no operand was a double.
* 2. Operations producing a string where no operand was a string (addition only).
* 3. Operations producing a value other than int/double/string.
*/
RootedScript script(cx, script_);
if (other) {
/*
* Addition operation, consider these cases:
* {int,bool} x {int,bool} -> int
* double x {int,bool,double} -> double
* string x any -> string
*/
if (type.isUnknown() || other->unknown()) {
target->addType(cx, Type::UnknownType());
} else if (type.isPrimitive(JSVAL_TYPE_DOUBLE)) {
if (other->hasAnyFlag(TYPE_FLAG_UNDEFINED | TYPE_FLAG_NULL |
TYPE_FLAG_INT32 | TYPE_FLAG_DOUBLE | TYPE_FLAG_BOOLEAN |
TYPE_FLAG_ANYOBJECT)) {
target->addType(cx, Type::DoubleType());
} else if (other->getObjectCount() != 0) {
TypeDynamicResult(cx, script, pc, Type::DoubleType());
}
} else if (type.isPrimitive(JSVAL_TYPE_STRING)) {
target->addType(cx, Type::StringType());
} else if (other->hasAnyFlag(TYPE_FLAG_DOUBLE)) {
target->addType(cx, Type::DoubleType());
} else if (other->hasAnyFlag(TYPE_FLAG_UNDEFINED | TYPE_FLAG_NULL |
TYPE_FLAG_INT32 | TYPE_FLAG_BOOLEAN |
TYPE_FLAG_ANYOBJECT)) {
target->addType(cx, Type::Int32Type());
} else if (other->getObjectCount() != 0) {
TypeDynamicResult(cx, script, pc, Type::Int32Type());
}
} else {
if (type.isUnknown())
target->addType(cx, Type::UnknownType());
else if (type.isPrimitive(JSVAL_TYPE_DOUBLE))
target->addType(cx, Type::DoubleType());
else if (!type.isAnyObject() && type.isObject())
TypeDynamicResult(cx, script, pc, Type::Int32Type());
else
target->addType(cx, Type::Int32Type());
}
}
void
TypeConstraintTransformThis::newType(JSContext *cx, TypeSet *source, Type type)
{
if (type.isUnknown() || type.isAnyObject() || type.isObject() || script_->strict) {
target->addType(cx, type);
return;
}
RootedScript script(cx, script_);
/*
* Builtin scripts do not adhere to normal assumptions about transforming
* 'this'.
*/
if (script->function() && script->function()->isSelfHostedBuiltin()) {
target->addType(cx, type);
return;
}
/*
* Note: if |this| is null or undefined, the pushed value is the outer window. We
* can't use script->getGlobalType() here because it refers to the inner window.
*/
if (!script->compileAndGo ||
type.isPrimitive(JSVAL_TYPE_NULL) ||
type.isPrimitive(JSVAL_TYPE_UNDEFINED)) {
target->addType(cx, Type::UnknownType());
return;
}
TypeObject *object = NULL;
switch (type.primitive()) {
case JSVAL_TYPE_INT32:
case JSVAL_TYPE_DOUBLE:
object = TypeScript::StandardType(cx, JSProto_Number);
break;
case JSVAL_TYPE_BOOLEAN:
object = TypeScript::StandardType(cx, JSProto_Boolean);
break;
case JSVAL_TYPE_STRING:
object = TypeScript::StandardType(cx, JSProto_String);
break;
default:
return;
}
if (!object) {
cx->compartment()->types.setPendingNukeTypes(cx);
return;
}
target->addType(cx, Type::ObjectType(object));
}
/////////////////////////////////////////////////////////////////////
// Freeze constraints
/////////////////////////////////////////////////////////////////////
/* Constraint which triggers recompilation of a script if any type is added to a type set. */
class TypeConstraintFreeze : public TypeConstraint
{
public:
RecompileInfo info;
/* Whether a new type has already been added, triggering recompilation. */
bool typeAdded;
TypeConstraintFreeze(RecompileInfo info)
: info(info), typeAdded(false)
{}
const char *kind() { return "freeze"; }
void newType(JSContext *cx, TypeSet *source, Type type)
{
if (typeAdded)
return;
typeAdded = true;
cx->compartment()->types.addPendingRecompile(cx, info);
}
};
void
HeapTypeSet::addFreeze(JSContext *cx)
{
add(cx, cx->typeLifoAlloc().new_<TypeConstraintFreeze>(
cx->compartment()->types.compiledInfo), false);
}
static inline JSValueType
GetValueTypeFromTypeFlags(TypeFlags flags)
{
switch (flags) {
case TYPE_FLAG_UNDEFINED:
return JSVAL_TYPE_UNDEFINED;
case TYPE_FLAG_NULL:
return JSVAL_TYPE_NULL;
case TYPE_FLAG_BOOLEAN:
return JSVAL_TYPE_BOOLEAN;
case TYPE_FLAG_INT32:
return JSVAL_TYPE_INT32;
case (TYPE_FLAG_INT32 | TYPE_FLAG_DOUBLE):
return JSVAL_TYPE_DOUBLE;
case TYPE_FLAG_STRING:
return JSVAL_TYPE_STRING;
case TYPE_FLAG_LAZYARGS:
return JSVAL_TYPE_MAGIC;
case TYPE_FLAG_ANYOBJECT:
return JSVAL_TYPE_OBJECT;
default:
return JSVAL_TYPE_UNKNOWN;
}
}
JSValueType
StackTypeSet::getKnownTypeTag()
{
TypeFlags flags = baseFlags();
JSValueType type;
if (baseObjectCount())
type = flags ? JSVAL_TYPE_UNKNOWN : JSVAL_TYPE_OBJECT;
else
type = GetValueTypeFromTypeFlags(flags);
/*
* If the type set is totally empty then it will be treated as unknown,
* but we still need to record the dependency as adding a new type can give
* it a definite type tag. This is not needed if there are enough types
* that the exact tag is unknown, as it will stay unknown as more types are
* added to the set.
*/
DebugOnly<bool> empty = flags == 0 && baseObjectCount() == 0;
JS_ASSERT_IF(empty, type == JSVAL_TYPE_UNKNOWN);
return type;
}
JSValueType
HeapTypeSet::getKnownTypeTag(JSContext *cx)
{
TypeFlags flags = baseFlags();
JSValueType type;
if (baseObjectCount())
type = flags ? JSVAL_TYPE_UNKNOWN : JSVAL_TYPE_OBJECT;
else
type = GetValueTypeFromTypeFlags(flags);
if (type != JSVAL_TYPE_UNKNOWN)
addFreeze(cx);
/*
* If the type set is totally empty then it will be treated as unknown,
* but we still need to record the dependency as adding a new type can give
* it a definite type tag. This is not needed if there are enough types
* that the exact tag is unknown, as it will stay unknown as more types are
* added to the set.
*/
DebugOnly<bool> empty = flags == 0 && baseObjectCount() == 0;
JS_ASSERT_IF(empty, type == JSVAL_TYPE_UNKNOWN);
return type;
}
bool
StackTypeSet::mightBeType(JSValueType type)
{
if (unknown())
return true;
if (type == JSVAL_TYPE_OBJECT)
return unknownObject() || baseObjectCount() != 0;
return baseFlags() & PrimitiveTypeFlag(type);
}
/* Constraint which triggers recompilation if an object acquires particular flags. */
class TypeConstraintFreezeObjectFlags : public TypeConstraint
{
public:
RecompileInfo info;
/* Flags we are watching for on this object. */
TypeObjectFlags flags;
/* Whether the object has already been marked as having one of the flags. */
bool marked;
TypeConstraintFreezeObjectFlags(RecompileInfo info, TypeObjectFlags flags)
: info(info), flags(flags),
marked(false)
{}
const char *kind() { return "freezeObjectFlags"; }
void newType(JSContext *cx, TypeSet *source, Type type) {}
void newObjectState(JSContext *cx, TypeObject *object, bool force)
{
if (!marked && (object->hasAnyFlags(flags) || (!flags && force))) {
marked = true;
cx->compartment()->types.addPendingRecompile(cx, info);
}
}
};
bool
StackTypeSet::hasObjectFlags(JSContext *cx, TypeObjectFlags flags)
{
if (unknownObject())
return true;
/*
* Treat type sets containing no objects as having all object flags,
* to spare callers from having to check this.
*/
if (baseObjectCount() == 0)
return true;
RootedObject obj(cx);
unsigned count = getObjectCount();
for (unsigned i = 0; i < count; i++) {
TypeObject *object = getTypeObject(i);
if (!object) {
if (!(obj = getSingleObject(i)))
continue;
if (!(object = obj->getType(cx)))
return true;
}
if (object->hasAnyFlags(flags))
return true;
/*
* Add a constraint on the the object to pick up changes in the
* object's properties.
*/
TypeSet *types = object->getProperty(cx, JSID_EMPTY, false);
if (!types)
return true;
types->add(cx, cx->typeLifoAlloc().new_<TypeConstraintFreezeObjectFlags>(
cx->compartment()->types.compiledInfo, flags), false);
}
return false;
}
bool
HeapTypeSet::HasObjectFlags(JSContext *cx, TypeObject *object, TypeObjectFlags flags)
{
if (object->hasAnyFlags(flags))
return true;
HeapTypeSet *types = object->getProperty(cx, JSID_EMPTY, false);
if (!types)
return true;
types->add(cx, cx->typeLifoAlloc().new_<TypeConstraintFreezeObjectFlags>(
cx->compartment()->types.compiledInfo, flags), false);
return false;
}
static inline void
ObjectStateChange(JSContext *cx, TypeObject *object, bool markingUnknown, bool force)
{
if (object->unknownProperties())
return;
/* All constraints listening to state changes are on the empty id. */
TypeSet *types = object->maybeGetProperty(JSID_EMPTY, cx);
/* Mark as unknown after getting the types, to avoid assertion. */
if (markingUnknown)
object->flags |= OBJECT_FLAG_DYNAMIC_MASK | OBJECT_FLAG_UNKNOWN_PROPERTIES;
if (types) {
TypeConstraint *constraint = types->constraintList;
while (constraint) {
constraint->newObjectState(cx, object, force);
constraint = constraint->next;
}
}
}
void
HeapTypeSet::WatchObjectStateChange(JSContext *cx, TypeObject *obj)
{
JS_ASSERT(!obj->unknownProperties());
HeapTypeSet *types = obj->getProperty(cx, JSID_EMPTY, false);
if (!types)
return;
/*
* Use a constraint which triggers recompilation when markStateChange is
* called, which will set 'force' to true.
*/
types->add(cx, cx->typeLifoAlloc().new_<TypeConstraintFreezeObjectFlags>(
cx->compartment()->types.compiledInfo,
0));
}
class TypeConstraintFreezeOwnProperty : public TypeConstraint
{
public:
RecompileInfo info;
bool updated;
bool configurable;
TypeConstraintFreezeOwnProperty(RecompileInfo info, bool configurable)
: info(info), updated(false), configurable(configurable)
{}
const char *kind() { return "freezeOwnProperty"; }
void newType(JSContext *cx, TypeSet *source, Type type) {}
void newPropertyState(JSContext *cx, TypeSet *source)
{
if (updated)
return;
if (source->ownProperty(configurable)) {
updated = true;
cx->compartment()->types.addPendingRecompile(cx, info);
}
}
};
static void
CheckNewScriptProperties(JSContext *cx, HandleTypeObject type, HandleFunction fun);
bool
HeapTypeSet::isOwnProperty(JSContext *cx, TypeObject *object, bool configurable)
{
/*
* Everywhere compiled code depends on definite properties associated with
* a type object's newScript, we need to make sure there are constraints
* in place which will mark those properties as configured should the
* definite properties be invalidated.
*/
if (object->flags & OBJECT_FLAG_NEW_SCRIPT_REGENERATE) {
if (object->newScript) {
Rooted<TypeObject*> typeObj(cx, object);
RootedFunction fun(cx, object->newScript->fun);
CheckNewScriptProperties(cx, typeObj, fun);
} else {
JS_ASSERT(object->flags & OBJECT_FLAG_NEW_SCRIPT_CLEARED);
object->flags &= ~OBJECT_FLAG_NEW_SCRIPT_REGENERATE;
}
}
if (ownProperty(configurable))
return true;
add(cx, cx->typeLifoAlloc().new_<TypeConstraintFreezeOwnProperty>(
cx->compartment()->types.compiledInfo,
configurable), false);
return false;
}
bool
HeapTypeSet::knownNonEmpty(JSContext *cx)
{
if (baseFlags() != 0 || baseObjectCount() != 0)
return true;
addFreeze(cx);
return false;
}
bool
StackTypeSet::knownNonStringPrimitive()
{
TypeFlags flags = baseFlags();
if (baseObjectCount() > 0)
return false;
if (flags >= TYPE_FLAG_STRING)
return false;
if (baseFlags() == 0)
return false;
return true;
}
bool
StackTypeSet::filtersType(const StackTypeSet *other, Type filteredType) const
{
if (other->unknown())
return unknown();
for (TypeFlags flag = 1; flag < TYPE_FLAG_ANYOBJECT; flag <<= 1) {
Type type = Type::PrimitiveType(TypeFlagPrimitive(flag));
if (type != filteredType && other->hasType(type) && !hasType(type))
return false;
}
if (other->unknownObject())
return unknownObject();
for (size_t i = 0; i < other->getObjectCount(); i++) {
TypeObjectKey *key = other->getObject(i);
if (key) {
Type type = Type::ObjectType(key);
if (type != filteredType && !hasType(type))
return false;
}
}
return true;
}
StackTypeSet::DoubleConversion
StackTypeSet::convertDoubleElements(JSContext *cx)
{
if (unknownObject() || !getObjectCount())
return AmbiguousDoubleConversion;
bool alwaysConvert = true;
bool maybeConvert = false;
bool dontConvert = false;
for (unsigned i = 0; i < getObjectCount(); i++) {
TypeObject *type = getTypeObject(i);
if (!type) {
if (JSObject *obj = getSingleObject(i)) {
type = obj->getType(cx);
if (!type)
return AmbiguousDoubleConversion;
} else {
continue;
}
}
if (type->unknownProperties()) {
alwaysConvert = false;
continue;
}
HeapTypeSet *types = type->getProperty(cx, JSID_VOID, false);
if (!types)
return AmbiguousDoubleConversion;
types->addFreeze(cx);
// We can't convert to double elements for objects which do not have
// double in their element types (as the conversion may render the type
// information incorrect), nor for non-array objects (as their elements
// may point to emptyObjectElements, which cannot be converted).
if (!types->hasType(Type::DoubleType()) || type->clasp != &ArrayClass) {
dontConvert = true;
alwaysConvert = false;
continue;
}
// Only bother with converting known packed arrays whose possible
// element types are int or double. Other arrays require type tests
// when elements are accessed regardless of the conversion.
if (types->getKnownTypeTag(cx) == JSVAL_TYPE_DOUBLE &&
!HeapTypeSet::HasObjectFlags(cx, type, OBJECT_FLAG_NON_PACKED))
{
maybeConvert = true;
} else {
alwaysConvert = false;
}
}
JS_ASSERT_IF(alwaysConvert, maybeConvert);
if (maybeConvert && dontConvert)
return AmbiguousDoubleConversion;
if (alwaysConvert)
return AlwaysConvertToDoubles;
if (maybeConvert)
return MaybeConvertToDoubles;
return DontConvertToDoubles;
}
bool
HeapTypeSet::knownSubset(JSContext *cx, TypeSet *other)
{
JS_ASSERT(!other->constraintsPurged());
if (!isSubset(other))
return false;
addFreeze(cx);
return true;
}
Class *
StackTypeSet::getKnownClass()
{
if (unknownObject())
return NULL;
Class *clasp = NULL;
unsigned count = getObjectCount();
for (unsigned i = 0; i < count; i++) {
Class *nclasp;
if (JSObject *object = getSingleObject(i))
nclasp = object->getClass();
else if (TypeObject *object = getTypeObject(i))
nclasp = object->clasp;
else
continue;
if (clasp && clasp != nclasp)
return NULL;
clasp = nclasp;
}
return clasp;
}
int
StackTypeSet::getTypedArrayType()
{
Class *clasp = getKnownClass();
if (clasp && IsTypedArrayClass(clasp))
return clasp - &TypedArray::classes[0];
return TypedArray::TYPE_MAX;
}
bool
StackTypeSet::isDOMClass()
{
if (unknownObject())
return false;
unsigned count = getObjectCount();
for (unsigned i = 0; i < count; i++) {
Class *clasp;
if (JSObject *object = getSingleObject(i))
clasp = object->getClass();
else if (TypeObject *object = getTypeObject(i))
clasp = object->clasp;
else
continue;
if (!(clasp->flags & JSCLASS_IS_DOMJSCLASS))
return false;
}
return true;
}
JSObject *
StackTypeSet::getCommonPrototype()
{
if (unknownObject())
return NULL;
JSObject *proto = NULL;
unsigned count = getObjectCount();
for (unsigned i = 0; i < count; i++) {
TaggedProto nproto;
if (JSObject *object = getSingleObject(i))
nproto = object->getProto();
else if (TypeObject *object = getTypeObject(i))
nproto = object->proto.get();
else
continue;
if (proto) {
if (nproto != proto)
return NULL;
} else {
if (!nproto.isObject())
return NULL;
proto = nproto.toObject();
}
}
return proto;
}
JSObject *
StackTypeSet::getSingleton()
{
if (baseFlags() != 0 || baseObjectCount() != 1)
return NULL;
return getSingleObject(0);
}
JSObject *
HeapTypeSet::getSingleton(JSContext *cx)
{
if (baseFlags() != 0 || baseObjectCount() != 1)
return NULL;
RootedObject obj(cx, getSingleObject(0));
if (obj)
addFreeze(cx);
return obj;
}
bool
HeapTypeSet::needsBarrier(JSContext *cx)
{
bool result = unknownObject()
|| getObjectCount() > 0
|| hasAnyFlag(TYPE_FLAG_STRING);
if (!result)
addFreeze(cx);
return result;
}
bool
StackTypeSet::propertyNeedsBarrier(JSContext *cx, jsid id)
{
RootedId typeId(cx, IdToTypeId(id));
if (unknownObject())
return true;
for (unsigned i = 0; i < getObjectCount(); i++) {
if (getSingleObject(i))
return true;
if (types::TypeObject *otype = getTypeObject(i)) {
if (otype->unknownProperties())
return true;
if (types::HeapTypeSet *propTypes = otype->maybeGetProperty(typeId, cx)) {
if (propTypes->needsBarrier(cx))
return true;
}
}
}
return false;
}
/*
* Force recompilation of any jitcode for the script, or of any other script
* which this script was inlined into.
*/
static inline void
AddPendingRecompile(JSContext *cx, JSScript *script)
{
cx->compartment()->types.addPendingRecompile(cx, script);
}
/*
* As for TypeConstraintFreeze, but describes an implicit freeze constraint
* added for stack types within a script. Applies to all compilations of the
* script, not just a single one.
*/
class TypeConstraintFreezeStack : public TypeConstraint
{
JSScript *script_;
public:
TypeConstraintFreezeStack(JSScript *script)
: script_(script)
{}
const char *kind() { return "freezeStack"; }
void newType(JSContext *cx, TypeSet *source, Type type)
{
/*
* Unlike TypeConstraintFreeze, triggering this constraint once does
* not disable it on future changes to the type set.
*/
AddPendingRecompile(cx, script_);
}
};
/////////////////////////////////////////////////////////////////////
// TypeCompartment
/////////////////////////////////////////////////////////////////////
TypeCompartment::TypeCompartment()
{
PodZero(this);
compiledInfo.outputIndex = RecompileInfo::NoCompilerRunning;
}
void
TypeZone::init(JSContext *cx)
{
if (!cx ||
!cx->hasOption(JSOPTION_TYPE_INFERENCE) ||
!cx->runtime()->jitSupportsFloatingPoint)
{
return;
}
inferenceEnabled = true;
}
TypeObject *
TypeCompartment::newTypeObject(JSContext *cx, Class *clasp, Handle<TaggedProto> proto, bool unknown)
{
JS_ASSERT_IF(proto.isObject(), cx->compartment() == proto.toObject()->compartment());
TypeObject *object = gc::NewGCThing<TypeObject, CanGC>(cx, gc::FINALIZE_TYPE_OBJECT,
sizeof(TypeObject), gc::TenuredHeap);
if (!object)
return NULL;
new(object) TypeObject(clasp, proto, clasp == &JSFunction::class_, unknown);
if (!cx->typeInferenceEnabled())
object->flags |= OBJECT_FLAG_UNKNOWN_MASK;
return object;
}
static inline jsbytecode *
PreviousOpcode(HandleScript script, jsbytecode *pc)
{
ScriptAnalysis *analysis = script->analysis();
JS_ASSERT(analysis->maybeCode(pc));
if (pc == script->code)
return NULL;
for (pc--;; pc--) {
if (analysis->maybeCode(pc))
break;
}
return pc;
}
/*
* If pc is an array initializer within an outer multidimensional array
* initializer, find the opcode of the previous newarray. NULL otherwise.
*/
static inline jsbytecode *
FindPreviousInnerInitializer(HandleScript script, jsbytecode *initpc)
{
if (!script->hasAnalysis())
return NULL;
if (!script->analysis()->maybeCode(initpc))
return NULL;
/*
* Pattern match the following bytecode, which will appear between
* adjacent initializer elements:
*
* endinit (for previous initializer)
* initelem_array (for previous initializer)
* newarray
*/
if (*initpc != JSOP_NEWARRAY)
return NULL;
jsbytecode *last = PreviousOpcode(script, initpc);
if (!last || *last != JSOP_INITELEM_ARRAY)
return NULL;
last = PreviousOpcode(script, last);
if (!last || *last != JSOP_ENDINIT)
return NULL;
/*
* Find the start of the previous initializer. Keep track of initializer
* depth to skip over inner initializers within the previous one (e.g. for
* arrays with three or more dimensions).
*/
size_t initDepth = 0;
jsbytecode *previnit;
for (previnit = last; previnit; previnit = PreviousOpcode(script, previnit)) {
if (*previnit == JSOP_ENDINIT)
initDepth++;
if (*previnit == JSOP_NEWINIT ||
*previnit == JSOP_NEWARRAY ||
*previnit == JSOP_NEWOBJECT)
{
if (--initDepth == 0)
break;
}
}
if (!previnit || *previnit != JSOP_NEWARRAY)
return NULL;
return previnit;
}
TypeObject *
TypeCompartment::addAllocationSiteTypeObject(JSContext *cx, AllocationSiteKey key)
{
AutoEnterAnalysis enter(cx);
if (!allocationSiteTable) {
allocationSiteTable = cx->new_<AllocationSiteTable>();
if (!allocationSiteTable || !allocationSiteTable->init()) {
cx->compartment()->types.setPendingNukeTypes(cx);
return NULL;
}
}
AllocationSiteTable::AddPtr p = allocationSiteTable->lookupForAdd(key);
JS_ASSERT(!p);
TypeObject *res = NULL;
/*
* If this is an array initializer nested in another array initializer,
* try to reuse the type objects from earlier elements to avoid
* distinguishing elements of the outer array unnecessarily.
*/
jsbytecode *pc = key.script->code + key.offset;
RootedScript keyScript(cx, key.script);
jsbytecode *prev = FindPreviousInnerInitializer(keyScript, pc);
if (prev) {
AllocationSiteKey nkey;
nkey.script = key.script;
nkey.offset = prev - key.script->code;
nkey.kind = JSProto_Array;
AllocationSiteTable::Ptr p = cx->compartment()->types.allocationSiteTable->lookup(nkey);
if (p)
res = p->value;
}
if (!res) {
RootedObject proto(cx);
if (!js_GetClassPrototype(cx, key.kind, &proto, NULL))
return NULL;
Rooted<TaggedProto> tagged(cx, TaggedProto(proto));
res = newTypeObject(cx, GetClassForProtoKey(key.kind), tagged);
if (!res) {
cx->compartment()->types.setPendingNukeTypes(cx);
return NULL;
}
key.script = keyScript;
}
if (JSOp(*pc) == JSOP_NEWOBJECT) {
/*
* This object is always constructed the same way and will not be
* observed by other code before all properties have been added. Mark
* all the properties as definite properties of the object.
*/
RootedObject baseobj(cx, key.script->getObject(GET_UINT32_INDEX(pc)));
if (!res->addDefiniteProperties(cx, baseobj))
return NULL;
}
if (!allocationSiteTable->add(p, key, res)) {
cx->compartment()->types.setPendingNukeTypes(cx);
return NULL;
}
return res;
}
static inline jsid
GetAtomId(JSContext *cx, JSScript *script, const jsbytecode *pc, unsigned offset)
{
PropertyName *name = script->getName(GET_UINT32_INDEX(pc + offset));
return IdToTypeId(NameToId(name));
}
bool
types::UseNewType(JSContext *cx, JSScript *script, jsbytecode *pc)
{
JS_ASSERT(cx->typeInferenceEnabled());
/*
* Make a heuristic guess at a use of JSOP_NEW that the constructed object
* should have a fresh type object. We do this when the NEW is immediately
* followed by a simple assignment to an object's .prototype field.
* This is designed to catch common patterns for subclassing in JS:
*
* function Super() { ... }
* function Sub1() { ... }
* function Sub2() { ... }
*
* Sub1.prototype = new Super();
* Sub2.prototype = new Super();
*
* Using distinct type objects for the particular prototypes of Sub1 and
* Sub2 lets us continue to distinguish the two subclasses and any extra
* properties added to those prototype objects.
*/
if (JSOp(*pc) != JSOP_NEW)
return false;
pc += JSOP_NEW_LENGTH;
if (JSOp(*pc) == JSOP_SETPROP) {
jsid id = GetAtomId(cx, script, pc, 0);
if (id == id_prototype(cx))
return true;
}
return false;
}
NewObjectKind
types::UseNewTypeForInitializer(JSContext *cx, JSScript *script, jsbytecode *pc, JSProtoKey key)
{
/*
* Objects created outside loops in global and eval scripts should have
* singleton types. For now this is only done for plain objects and typed
* arrays, but not normal arrays.
*/
if (!cx->typeInferenceEnabled() || (script->function() && !script->treatAsRunOnce))
return GenericObject;
if (key != JSProto_Object && !(key >= JSProto_Int8Array && key <= JSProto_Uint8ClampedArray))
return GenericObject;
/*
* All loops in the script will have a JSTRY_ITER or JSTRY_LOOP try note
* indicating their boundary.
*/
if (!script->hasTrynotes())
return SingletonObject;
unsigned offset = pc - script->code;
JSTryNote *tn = script->trynotes()->vector;
JSTryNote *tnlimit = tn + script->trynotes()->length;
for (; tn < tnlimit; tn++) {
if (tn->kind != JSTRY_ITER && tn->kind != JSTRY_LOOP)
continue;
unsigned startOffset = script->mainOffset + tn->start;
unsigned endOffset = startOffset + tn->length;
if (offset >= startOffset && offset < endOffset)
return GenericObject;
}
return SingletonObject;
}
NewObjectKind
types::UseNewTypeForInitializer(JSContext *cx, JSScript *script, jsbytecode *pc, Class *clasp)
{
return UseNewTypeForInitializer(cx, script, pc, JSCLASS_CACHED_PROTO_KEY(clasp));
}
static inline bool
ClassCanHaveExtraProperties(Class *clasp)
{
JS_ASSERT(clasp->resolve);
return clasp->resolve != JS_ResolveStub || clasp->ops.lookupGeneric || clasp->ops.getGeneric;
}
static inline bool
PrototypeHasIndexedProperty(JSContext *cx, JSObject *obj)
{
do {
TypeObject *type = obj->getType(cx);
if (!type)
return true;
if (ClassCanHaveExtraProperties(type->clasp))
return true;
if (type->unknownProperties())
return true;
HeapTypeSet *indexTypes = type->getProperty(cx, JSID_VOID, false);
if (!indexTypes || indexTypes->isOwnProperty(cx, type, true) || indexTypes->knownNonEmpty(cx))
return true;
obj = obj->getProto();
} while (obj);
return false;
}
bool
types::ArrayPrototypeHasIndexedProperty(JSContext *cx, HandleScript script)
{
if (!cx->typeInferenceEnabled() || !script->compileAndGo)
return true;
JSObject *proto = script->global().getOrCreateArrayPrototype(cx);
if (!proto)
return true;
return PrototypeHasIndexedProperty(cx, proto);
}
bool
types::TypeCanHaveExtraIndexedProperties(JSContext *cx, StackTypeSet *types)
{
Class *clasp = types->getKnownClass();
// Note: typed arrays have indexed properties not accounted for by type
// information, though these are all in bounds and will be accounted for
// by JIT paths.
if (!clasp || (ClassCanHaveExtraProperties(clasp) && !IsTypedArrayClass(clasp)))
return true;
if (types->hasObjectFlags(cx, types::OBJECT_FLAG_SPARSE_INDEXES))
return true;
JSObject *proto = types->getCommonPrototype();
if (!proto)
return true;
return PrototypeHasIndexedProperty(cx, proto);
}
bool
TypeCompartment::growPendingArray(JSContext *cx)
{
unsigned newCapacity = js::Max(unsigned(100), pendingCapacity * 2);
PendingWork *newArray = js_pod_calloc<PendingWork>(newCapacity);
if (!newArray) {
cx->compartment()->types.setPendingNukeTypes(cx);
return false;
}
PodCopy(newArray, pendingArray, pendingCount);
js_free(pendingArray);
pendingArray = newArray;
pendingCapacity = newCapacity;
return true;
}
void
TypeCompartment::processPendingRecompiles(FreeOp *fop)
{
if (!pendingRecompiles)
return;
/* Steal the list of scripts to recompile, else we will try to recursively recompile them. */
Vector<RecompileInfo> *pending = pendingRecompiles;
pendingRecompiles = NULL;
JS_ASSERT(!pending->empty());
#ifdef JS_ION
jit::Invalidate(*this, fop, *pending);
#endif
fop->delete_(pending);
}
void
TypeCompartment::setPendingNukeTypes(JSContext *cx)
{
TypeZone *zone = &compartment()->zone()->types;
if (!zone->pendingNukeTypes) {
if (cx->compartment())
js_ReportOutOfMemory(cx);
zone->pendingNukeTypes = true;
}
}
void
TypeZone::setPendingNukeTypes()
{
pendingNukeTypes = true;
}
void
TypeZone::nukeTypes(FreeOp *fop)
{
/*
* This is the usual response if we encounter an OOM while adding a type
* or resolving type constraints. Reset the compartment to not use type
* inference, and recompile all scripts.
*
* Because of the nature of constraint-based analysis (add constraints, and
* iterate them until reaching a fixpoint), we can't undo an add of a type set,
* and merely aborting the operation which triggered the add will not be
* sufficient for correct behavior as we will be leaving the types in an
* inconsistent state.
*/
JS_ASSERT(pendingNukeTypes);
for (CompartmentsInZoneIter comp(zone()); !comp.done(); comp.next()) {
if (comp->types.pendingRecompiles) {
fop->free_(comp->types.pendingRecompiles);
comp->types.pendingRecompiles = NULL;
}
}
inferenceEnabled = false;
#ifdef JS_ION
jit::InvalidateAll(fop, zone());
/* Throw away all JIT code in the compartment, but leave everything else alone. */
for (gc::CellIter i(zone(), gc::FINALIZE_SCRIPT); !i.done(); i.next()) {
JSScript *script = i.get<JSScript>();
jit::FinishInvalidation(fop, script);
}
#endif /* JS_ION */
pendingNukeTypes = false;
}
void
TypeCompartment::addPendingRecompile(JSContext *cx, const RecompileInfo &info)
{
CompilerOutput *co = info.compilerOutput(cx);
if (!co)
return;
if (co->pendingRecompilation)
return;
if (co->isValid())
CancelOffThreadIonCompile(cx->compartment(), co->script);
if (compiledInfo.outputIndex == info.outputIndex) {
/* Tell Ion to discard generated code when it's done. */
JS_ASSERT(compiledInfo.outputIndex != RecompileInfo::NoCompilerRunning);
JS_ASSERT(co->kind() == CompilerOutput::Ion || co->kind() == CompilerOutput::ParallelIon);
co->invalidate();
return;
}
if (!co->isValid()) {
JS_ASSERT(co->script == NULL);
return;
}
#if defined(JS_ION)
if (!co->script->hasAnyIonScript()) {
/* Scripts which haven't been compiled yet don't need to be recompiled. */
return;
}
#endif
if (!pendingRecompiles) {
pendingRecompiles = cx->new_< Vector<RecompileInfo> >(cx);
if (!pendingRecompiles) {
cx->compartment()->types.setPendingNukeTypes(cx);
return;
}
}
#if DEBUG
for (size_t i = 0; i < pendingRecompiles->length(); i++) {
RecompileInfo pr = (*pendingRecompiles)[i];
JS_ASSERT(info.outputIndex != pr.outputIndex);
}
#endif
if (!pendingRecompiles->append(info)) {
cx->compartment()->types.setPendingNukeTypes(cx);
return;
}
InferSpew(ISpewOps, "addPendingRecompile: %p:%s:%d", co->script, co->script->filename(), co->script->lineno);
co->setPendingRecompilation();
}
void
TypeCompartment::addPendingRecompile(JSContext *cx, JSScript *script)
{
JS_ASSERT(script);
if (!constrainedOutputs)
return;
#ifdef JS_ION
CancelOffThreadIonCompile(cx->compartment(), script);
// Let the script warm up again before attempting another compile.
if (jit::IsBaselineEnabled(cx))
script->resetUseCount();
if (script->hasIonScript())
addPendingRecompile(cx, script->ionScript()->recompileInfo());
if (script->hasParallelIonScript())
addPendingRecompile(cx, script->parallelIonScript()->recompileInfo());
#endif
/*
* Remind Ion not to save the compile code if generating type
* inference information mid-compilation causes an invalidation of the
* script being compiled.
*/
if (compiledInfo.outputIndex != RecompileInfo::NoCompilerRunning) {
CompilerOutput *co = compiledInfo.compilerOutput(cx);
if (!co) {
if (script->compartment() != cx->compartment())
MOZ_CRASH();
return;
}
JS_ASSERT(co->kind() == CompilerOutput::Ion || co->kind() == CompilerOutput::ParallelIon);
if (co->script == script)
co->invalidate();
}
/*
* When one script is inlined into another the caller listens to state
* changes on the callee's script, so trigger these to force recompilation
* of any such callers.
*/
if (script->function() && !script->function()->hasLazyType())
ObjectStateChange(cx, script->function()->type(), false, true);
}
void
TypeCompartment::monitorBytecode(JSContext *cx, JSScript *script, uint32_t offset,
bool returnOnly)
{
if (!script->ensureRanInference(cx))
return;
ScriptAnalysis *analysis = script->analysis();
jsbytecode *pc = script->code + offset;
JS_ASSERT_IF(returnOnly, js_CodeSpec[*pc].format & JOF_INVOKE);
Bytecode &code = analysis->getCode(pc);
if (returnOnly ? code.monitoredTypesReturn : code.monitoredTypes)
return;
InferSpew(ISpewOps, "addMonitorNeeded:%s #%u:%05u",
returnOnly ? " returnOnly" : "", script->id(), offset);
/* Dynamically monitor this call to keep track of its result types. */
if (js_CodeSpec[*pc].format & JOF_INVOKE)
code.monitoredTypesReturn = true;
if (returnOnly)
return;
code.monitoredTypes = true;
AddPendingRecompile(cx, script);
}
void
TypeCompartment::markSetsUnknown(JSContext *cx, TypeObject *target)
{
JS_ASSERT(this == &cx->compartment()->types);
JS_ASSERT(!(target->flags & OBJECT_FLAG_SETS_MARKED_UNKNOWN));
JS_ASSERT(!target->singleton);
JS_ASSERT(target->unknownProperties());
target->flags |= OBJECT_FLAG_SETS_MARKED_UNKNOWN;
AutoEnterAnalysis enter(cx);
/*
* Mark both persistent and transient type sets which contain obj as having
* a generic object type. It is not sufficient to mark just the persistent
* sets, as analysis of individual opcodes can pull type objects from
* static information (like initializer objects at various offsets).
*
* We make a list of properties to update and fix them afterwards, as adding
* types can't be done while iterating over cells as it can potentially make
* new type objects as well or trigger GC.
*/
Vector<TypeSet *> pending(cx);
for (gc::CellIter i(cx->zone(), gc::FINALIZE_TYPE_OBJECT); !i.done(); i.next()) {
TypeObject *object = i.get<TypeObject>();
unsigned count = object->getPropertyCount();
for (unsigned i = 0; i < count; i++) {
Property *prop = object->getProperty(i);
if (prop && prop->types.hasType(Type::ObjectType(target))) {
if (!pending.append(&prop->types))
cx->compartment()->types.setPendingNukeTypes(cx);
}
}
}
for (unsigned i = 0; i < pending.length(); i++)
pending[i]->addType(cx, Type::AnyObjectType());
for (gc::CellIter i(cx->zone(), gc::FINALIZE_SCRIPT); !i.done(); i.next()) {
RootedScript script(cx, i.get<JSScript>());
if (script->types) {
unsigned count = TypeScript::NumTypeSets(script);
TypeSet *typeArray = script->types->typeArray();
for (unsigned i = 0; i < count; i++) {
if (typeArray[i].hasType(Type::ObjectType(target)))
typeArray[i].addType(cx, Type::AnyObjectType());
}
}
if (script->hasAnalysis() && script->analysis()->ranInference()) {
for (unsigned i = 0; i < script->length; i++) {
if (!script->analysis()->maybeCode(i))
continue;
jsbytecode *pc = script->code + i;
unsigned defCount = GetDefCount(script, i);
if (ExtendedDef(pc))
defCount++;
for (unsigned j = 0; j < defCount; j++) {
TypeSet *types = script->analysis()->pushedTypes(pc, j);
if (types->hasType(Type::ObjectType(target)))
types->addType(cx, Type::AnyObjectType());
}
}
}
}
}
void
ScriptAnalysis::addTypeBarrier(JSContext *cx, const jsbytecode *pc, TypeSet *target, Type type)
{
Bytecode &code = getCode(pc);
if (!type.isUnknown() && !type.isAnyObject() &&
type.isObject() && target->getObjectCount() >= BARRIER_OBJECT_LIMIT) {
/* Ignore this barrier, just add the type to the target. */
target->addType(cx, type);
return;
}
if (!code.typeBarriers) {
/*
* Adding type barriers at a bytecode which did not have them before
* will trigger recompilation. If there were already type barriers,
* however, do not trigger recompilation (the script will be recompiled
* if any of the barriers is ever violated).
*/
AddPendingRecompile(cx, script_);
}
/* Ignore duplicate barriers. */
size_t barrierCount = 0;
TypeBarrier *barrier = code.typeBarriers;
while (barrier) {
if (barrier->target == target && !barrier->singleton) {
if (barrier->type == type)