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gecko/js/src/jsinferinlines.h

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/* -*- 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/. */
/* Inline members for javascript type inference. */
#ifndef jsinferinlines_h
#define jsinferinlines_h
#include "jsinfer.h"
#include "mozilla/PodOperations.h"
#include "jsanalyze.h"
#include "builtin/ParallelArray.h"
#include "jit/ExecutionModeInlines.h"
#include "vm/ArrayObject.h"
#include "vm/BooleanObject.h"
#include "vm/NumberObject.h"
#include "vm/StringObject.h"
#include "vm/TypedArrayObject.h"
#include "jsanalyzeinlines.h"
#include "jscntxtinlines.h"
inline bool
js::TaggedProto::isObject() const
{
/* Skip nullptr and Proxy::LazyProto. */
return uintptr_t(proto) > uintptr_t(Proxy::LazyProto);
}
inline bool
js::TaggedProto::isLazy() const
{
return proto == Proxy::LazyProto;
}
inline JSObject *
js::TaggedProto::toObject() const
{
JS_ASSERT(isObject());
return proto;
}
inline JSObject *
js::TaggedProto::toObjectOrNull() const
{
JS_ASSERT(!proto || isObject());
return proto;
}
template<class Outer>
inline bool
js::TaggedProtoOperations<Outer>::isLazy() const
{
return value()->isLazy();
}
template<class Outer>
inline bool
js::TaggedProtoOperations<Outer>::isObject() const
{
return value()->isObject();
}
template<class Outer>
inline JSObject *
js::TaggedProtoOperations<Outer>::toObject() const
{
return value()->toObject();
}
template<class Outer>
inline JSObject *
js::TaggedProtoOperations<Outer>::toObjectOrNull() const
{
return value()->toObjectOrNull();
}
namespace js {
namespace types {
/////////////////////////////////////////////////////////////////////
// CompilerOutput & RecompileInfo
/////////////////////////////////////////////////////////////////////
inline jit::IonScript *
CompilerOutput::ion() const
{
#ifdef JS_ION
// Note: If type constraints are generated before compilation has finished
// (i.e. after IonBuilder but before CodeGenerator::link) then a valid
// CompilerOutput may not yet have an associated IonScript.
JS_ASSERT(isValid());
jit::IonScript *ion = jit::GetIonScript(script(), mode());
JS_ASSERT(ion != ION_COMPILING_SCRIPT);
return ion;
#endif
MOZ_ASSUME_UNREACHABLE("Invalid kind of CompilerOutput");
}
inline CompilerOutput*
RecompileInfo::compilerOutput(TypeCompartment &types) const
{
if (!types.constrainedOutputs || outputIndex >= types.constrainedOutputs->length())
return nullptr;
return &(*types.constrainedOutputs)[outputIndex];
}
inline CompilerOutput*
RecompileInfo::compilerOutput(JSContext *cx) const
{
return compilerOutput(cx->compartment()->types);
}
/////////////////////////////////////////////////////////////////////
// Types
/////////////////////////////////////////////////////////////////////
/* static */ inline Type
Type::ObjectType(JSObject *obj)
{
if (obj->hasSingletonType())
return Type(uintptr_t(obj) | 1);
return Type(uintptr_t(obj->type()));
}
/* static */ inline Type
Type::ObjectType(TypeObject *obj)
{
if (obj->singleton)
return Type(uintptr_t(obj->singleton.get()) | 1);
return Type(uintptr_t(obj));
}
/* static */ inline Type
Type::ObjectType(TypeObjectKey *obj)
{
return Type(uintptr_t(obj));
}
inline Type
GetValueType(const Value &val)
{
if (val.isDouble())
return Type::DoubleType();
if (val.isObject())
return Type::ObjectType(&val.toObject());
return Type::PrimitiveType(val.extractNonDoubleType());
}
inline TypeFlags
PrimitiveTypeFlag(JSValueType type)
{
switch (type) {
case JSVAL_TYPE_UNDEFINED:
return TYPE_FLAG_UNDEFINED;
case JSVAL_TYPE_NULL:
return TYPE_FLAG_NULL;
case JSVAL_TYPE_BOOLEAN:
return TYPE_FLAG_BOOLEAN;
case JSVAL_TYPE_INT32:
return TYPE_FLAG_INT32;
case JSVAL_TYPE_DOUBLE:
return TYPE_FLAG_DOUBLE;
case JSVAL_TYPE_STRING:
return TYPE_FLAG_STRING;
case JSVAL_TYPE_MAGIC:
return TYPE_FLAG_LAZYARGS;
default:
MOZ_ASSUME_UNREACHABLE("Bad type");
}
}
inline JSValueType
TypeFlagPrimitive(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_DOUBLE:
return JSVAL_TYPE_DOUBLE;
case TYPE_FLAG_STRING:
return JSVAL_TYPE_STRING;
case TYPE_FLAG_LAZYARGS:
return JSVAL_TYPE_MAGIC;
default:
MOZ_ASSUME_UNREACHABLE("Bad type");
}
}
/*
* Get the canonical representation of an id to use when doing inference. This
* maintains the constraint that if two different jsids map to the same property
* in JS (e.g. 3 and "3"), they have the same type representation.
*/
inline jsid
IdToTypeId(jsid id)
{
JS_ASSERT(!JSID_IS_EMPTY(id));
/*
* All integers must map to the aggregate property for index types, including
* negative integers.
*/
if (JSID_IS_INT(id))
return JSID_VOID;
/*
* Check for numeric strings, as in js_StringIsIndex, but allow negative
* and overflowing integers.
*/
if (JSID_IS_STRING(id)) {
JSFlatString *str = JSID_TO_FLAT_STRING(id);
JS::TwoByteChars cp = str->range();
if (JS7_ISDEC(cp[0]) || cp[0] == '-') {
for (size_t i = 1; i < cp.length(); ++i) {
if (!JS7_ISDEC(cp[i]))
return id;
}
return JSID_VOID;
}
return id;
}
return JSID_VOID;
}
const char * TypeIdStringImpl(jsid id);
/* Convert an id for printing during debug. */
static inline const char *
TypeIdString(jsid id)
{
#ifdef DEBUG
return TypeIdStringImpl(id);
#else
return "(missing)";
#endif
}
/*
* Structure for type inference entry point functions. All functions which can
* change type information must use this, and functions which depend on
* intermediate types (i.e. JITs) can use this to ensure that intermediate
* information is not collected and does not change.
*
* Pins inference results so that intermediate type information, TypeObjects
* and JSScripts won't be collected during GC. Does additional sanity checking
* that inference is not reentrant and that recompilations occur properly.
*/
struct AutoEnterAnalysis
{
/* Prevent GC activity in the middle of analysis. */
gc::AutoSuppressGC suppressGC;
FreeOp *freeOp;
JSCompartment *compartment;
bool oldActiveAnalysis;
AutoEnterAnalysis(ExclusiveContext *cx)
: suppressGC(cx)
{
init(cx->defaultFreeOp(), cx->compartment());
}
AutoEnterAnalysis(FreeOp *fop, JSCompartment *comp)
: suppressGC(comp)
{
init(fop, comp);
}
~AutoEnterAnalysis()
{
compartment->activeAnalysis = oldActiveAnalysis;
/*
* If there are no more type inference activations on the stack,
* process any triggered recompilations. Note that we should not be
* invoking any scripted code while type inference is running.
* :TODO: assert this.
*/
if (!compartment->activeAnalysis) {
TypeCompartment *types = &compartment->types;
if (compartment->zone()->types.pendingNukeTypes)
compartment->zone()->types.nukeTypes(freeOp);
else if (types->pendingRecompiles)
types->processPendingRecompiles(freeOp);
}
}
private:
void init(FreeOp *fop, JSCompartment *comp) {
freeOp = fop;
compartment = comp;
oldActiveAnalysis = compartment->activeAnalysis;
compartment->activeAnalysis = true;
}
};
/////////////////////////////////////////////////////////////////////
// Interface functions
/////////////////////////////////////////////////////////////////////
/*
* These functions check whether inference is enabled before performing some
* action on the type state. To avoid checking cx->typeInferenceEnabled()
* everywhere, it is generally preferred to use one of these functions or
* a type function on JSScript to perform inference operations.
*/
inline const Class *
GetClassForProtoKey(JSProtoKey key)
{
switch (key) {
case JSProto_Object:
return &JSObject::class_;
case JSProto_Array:
return &ArrayObject::class_;
case JSProto_Number:
return &NumberObject::class_;
case JSProto_Boolean:
return &BooleanObject::class_;
case JSProto_String:
return &StringObject::class_;
case JSProto_RegExp:
return &RegExpObject::class_;
case JSProto_Int8Array:
case JSProto_Uint8Array:
case JSProto_Int16Array:
case JSProto_Uint16Array:
case JSProto_Int32Array:
case JSProto_Uint32Array:
case JSProto_Float32Array:
case JSProto_Float64Array:
case JSProto_Uint8ClampedArray:
return &TypedArrayObject::classes[key - JSProto_Int8Array];
case JSProto_ArrayBuffer:
return &ArrayBufferObject::class_;
case JSProto_DataView:
return &DataViewObject::class_;
case JSProto_ParallelArray:
return &ParallelArrayObject::class_;
default:
MOZ_ASSUME_UNREACHABLE("Bad proto key");
}
}
/*
* Get the default 'new' object for a given standard class, per the currently
* active global.
*/
inline TypeObject *
GetTypeNewObject(JSContext *cx, JSProtoKey key)
{
RootedObject proto(cx);
if (!js_GetClassPrototype(cx, key, &proto))
return nullptr;
return cx->getNewType(GetClassForProtoKey(key), proto.get());
}
/* Get a type object for the immediate allocation site within a native. */
inline TypeObject *
GetTypeCallerInitObject(JSContext *cx, JSProtoKey key)
{
if (cx->typeInferenceEnabled()) {
jsbytecode *pc;
RootedScript script(cx, cx->currentScript(&pc));
if (script)
return TypeScript::InitObject(cx, script, pc, key);
}
return GetTypeNewObject(cx, key);
}
void MarkIteratorUnknownSlow(JSContext *cx);
void TypeMonitorCallSlow(JSContext *cx, JSObject *callee, const CallArgs &args,
bool constructing);
/*
* Monitor a javascript call, either on entry to the interpreter or made
* from within the interpreter.
*/
inline void
TypeMonitorCall(JSContext *cx, const js::CallArgs &args, bool constructing)
{
if (args.callee().is<JSFunction>()) {
JSFunction *fun = &args.callee().as<JSFunction>();
if (fun->isInterpreted() && fun->nonLazyScript()->types && cx->typeInferenceEnabled())
TypeMonitorCallSlow(cx, &args.callee(), args, constructing);
}
}
inline bool
TrackPropertyTypes(ExclusiveContext *cx, JSObject *obj, jsid id)
{
if (!cx->typeInferenceEnabled() || obj->hasLazyType() || obj->type()->unknownProperties())
return false;
if (obj->hasSingletonType() && !obj->type()->maybeGetProperty(id))
return false;
return true;
}
inline void
EnsureTrackPropertyTypes(JSContext *cx, JSObject *obj, jsid id)
{
if (!cx->typeInferenceEnabled())
return;
id = IdToTypeId(id);
if (obj->hasSingletonType()) {
AutoEnterAnalysis enter(cx);
if (obj->hasLazyType() && !obj->getType(cx)) {
cx->compartment()->types.setPendingNukeTypes(cx);
return;
}
if (!obj->type()->unknownProperties())
obj->type()->getProperty(cx, id);
}
JS_ASSERT(obj->type()->unknownProperties() || TrackPropertyTypes(cx, obj, id));
}
inline bool
HasTypePropertyId(JSObject *obj, jsid id, Type type)
{
if (obj->hasLazyType())
return true;
if (obj->type()->unknownProperties())
return true;
if (HeapTypeSet *types = obj->type()->maybeGetProperty(IdToTypeId(id)))
return types->hasType(type);
return false;
}
inline bool
HasTypePropertyId(JSObject *obj, jsid id, const Value &value)
{
return HasTypePropertyId(obj, id, GetValueType(value));
}
/* Add a possible type for a property of obj. */
inline void
AddTypePropertyId(ExclusiveContext *cx, JSObject *obj, jsid id, Type type)
{
if (cx->typeInferenceEnabled()) {
id = IdToTypeId(id);
if (TrackPropertyTypes(cx, obj, id))
obj->type()->addPropertyType(cx, id, type);
}
}
inline void
AddTypePropertyId(ExclusiveContext *cx, JSObject *obj, jsid id, const Value &value)
{
if (cx->typeInferenceEnabled()) {
id = IdToTypeId(id);
if (TrackPropertyTypes(cx, obj, id))
obj->type()->addPropertyType(cx, id, value);
}
}
inline void
AddTypeProperty(ExclusiveContext *cx, TypeObject *obj, const char *name, Type type)
{
if (cx->typeInferenceEnabled() && !obj->unknownProperties())
obj->addPropertyType(cx, name, type);
}
inline void
AddTypeProperty(ExclusiveContext *cx, TypeObject *obj, const char *name, const Value &value)
{
if (cx->typeInferenceEnabled() && !obj->unknownProperties())
obj->addPropertyType(cx, name, value);
}
/* Set one or more dynamic flags on a type object. */
inline void
MarkTypeObjectFlags(ExclusiveContext *cx, JSObject *obj, TypeObjectFlags flags)
{
if (cx->typeInferenceEnabled() && !obj->hasLazyType() && !obj->type()->hasAllFlags(flags))
obj->type()->setFlags(cx, flags);
}
/*
* Mark all properties of a type object as unknown. If markSetsUnknown is set,
* scan the entire compartment and mark all type sets containing it as having
* an unknown object. This is needed for correctness in dealing with mutable
* __proto__, which can change the type of an object dynamically.
*/
inline void
MarkTypeObjectUnknownProperties(JSContext *cx, TypeObject *obj,
bool markSetsUnknown = false)
{
if (cx->typeInferenceEnabled()) {
if (!obj->unknownProperties())
obj->markUnknown(cx);
if (markSetsUnknown && !(obj->flags & OBJECT_FLAG_SETS_MARKED_UNKNOWN))
cx->compartment()->types.markSetsUnknown(cx, obj);
}
}
/*
* Mark any property which has been deleted or configured to be non-writable or
* have a getter/setter.
*/
inline void
MarkTypePropertyConfigured(ExclusiveContext *cx, HandleObject obj, jsid id)
{
if (cx->typeInferenceEnabled()) {
id = IdToTypeId(id);
if (TrackPropertyTypes(cx, obj, id))
obj->type()->markPropertyConfigured(cx, id);
}
}
inline bool
IsTypePropertyIdMarkedConfigured(JSObject *obj, jsid id)
{
return obj->type()->isPropertyConfigured(id);
}
/* Mark a state change on a particular object. */
inline void
MarkObjectStateChange(ExclusiveContext *cx, JSObject *obj)
{
if (cx->typeInferenceEnabled() && !obj->hasLazyType() && !obj->type()->unknownProperties())
obj->type()->markStateChange(cx);
}
/*
* For an array or object which has not yet escaped and been referenced elsewhere,
* pick a new type based on the object's current contents.
*/
inline void
FixArrayType(ExclusiveContext *cx, HandleObject obj)
{
if (cx->typeInferenceEnabled())
cx->compartment()->types.fixArrayType(cx, obj);
}
inline void
FixObjectType(ExclusiveContext *cx, HandleObject obj)
{
if (cx->typeInferenceEnabled())
cx->compartment()->types.fixObjectType(cx, obj);
}
/* Interface helpers for JSScript*. */
extern void TypeMonitorResult(JSContext *cx, JSScript *script, jsbytecode *pc,
const js::Value &rval);
extern void TypeDynamicResult(JSContext *cx, JSScript *script, jsbytecode *pc,
js::types::Type type);
/////////////////////////////////////////////////////////////////////
// Script interface functions
/////////////////////////////////////////////////////////////////////
/* static */ inline unsigned
TypeScript::NumTypeSets(JSScript *script)
{
return script->nTypeSets + analyze::LocalSlot(script, 0);
}
/* static */ inline StackTypeSet *
TypeScript::ThisTypes(JSScript *script)
{
return script->types->typeArray() + script->nTypeSets + js::analyze::ThisSlot();
}
/*
* Note: for non-escaping arguments and locals, argTypes/localTypes reflect
* only the initial type of the variable (e.g. passed values for argTypes,
* or undefined for localTypes) and not types from subsequent assignments.
*/
/* static */ inline StackTypeSet *
TypeScript::ArgTypes(JSScript *script, unsigned i)
{
JS_ASSERT(i < script->function()->nargs);
return script->types->typeArray() + script->nTypeSets + js::analyze::ArgSlot(i);
}
template <typename TYPESET>
/* static */ inline TYPESET *
TypeScript::BytecodeTypes(JSScript *script, jsbytecode *pc, uint32_t *hint, TYPESET *typeArray)
{
JS_ASSERT(js_CodeSpec[*pc].format & JOF_TYPESET);
JS_ASSERT(script->types && script->types->bytecodeMap);
uint32_t *bytecodeMap = script->types->bytecodeMap;
uint32_t offset = pc - script->code;
JS_ASSERT(offset < script->length);
// See if this pc is the next typeset opcode after the last one looked up.
if (bytecodeMap[*hint + 1] == offset && (*hint + 1) < script->nTypeSets) {
(*hint)++;
return typeArray + *hint;
}
// See if this pc is the same as the last one looked up.
if (bytecodeMap[*hint] == offset)
return typeArray + *hint;
// Fall back to a binary search.
size_t bottom = 0;
size_t top = script->nTypeSets - 1;
size_t mid = bottom + (top - bottom) / 2;
while (mid < top) {
if (bytecodeMap[mid] < offset)
bottom = mid + 1;
else if (bytecodeMap[mid] > offset)
top = mid;
else
break;
mid = bottom + (top - bottom) / 2;
}
// We should have have zeroed in on either the exact offset, unless there
// are more JOF_TYPESET opcodes than nTypeSets in the script (as can happen
// if the script is very long).
JS_ASSERT(bytecodeMap[mid] == offset || mid == top);
*hint = mid;
return typeArray + *hint;
}
/* static */ inline StackTypeSet *
TypeScript::BytecodeTypes(JSScript *script, jsbytecode *pc)
{
JS_ASSERT(CurrentThreadCanAccessRuntime(script->runtimeFromMainThread()));
uint32_t *hint = script->types->bytecodeMap + script->nTypeSets;
return BytecodeTypes(script, pc, hint, script->types->typeArray());
}
struct AllocationSiteKey : public DefaultHasher<AllocationSiteKey> {
JSScript *script;
uint32_t offset : 24;
JSProtoKey kind : 8;
static const uint32_t OFFSET_LIMIT = (1 << 23);
AllocationSiteKey() { mozilla::PodZero(this); }
static inline uint32_t hash(AllocationSiteKey key) {
return uint32_t(size_t(key.script->code + key.offset)) ^ key.kind;
}
static inline bool match(const AllocationSiteKey &a, const AllocationSiteKey &b) {
return a.script == b.script && a.offset == b.offset && a.kind == b.kind;
}
};
/* Whether to use a new type object for an initializer opcode at script/pc. */
js::NewObjectKind
UseNewTypeForInitializer(JSScript *script, jsbytecode *pc, JSProtoKey key);
js::NewObjectKind
UseNewTypeForInitializer(JSScript *script, jsbytecode *pc, const Class *clasp);
/* static */ inline TypeObject *
TypeScript::InitObject(JSContext *cx, JSScript *script, jsbytecode *pc, JSProtoKey kind)
{
JS_ASSERT(!UseNewTypeForInitializer(script, pc, kind));
/* :XXX: Limit script->length so we don't need to check the offset up front? */
uint32_t offset = pc - script->code;
if (!cx->typeInferenceEnabled() || !script->compileAndGo || offset >= AllocationSiteKey::OFFSET_LIMIT)
return GetTypeNewObject(cx, kind);
AllocationSiteKey key;
key.script = script;
key.offset = offset;
key.kind = kind;
if (!cx->compartment()->types.allocationSiteTable)
return cx->compartment()->types.addAllocationSiteTypeObject(cx, key);
AllocationSiteTable::Ptr p = cx->compartment()->types.allocationSiteTable->lookup(key);
if (p)
return p->value;
return cx->compartment()->types.addAllocationSiteTypeObject(cx, key);
}
/* Set the type to use for obj according to the site it was allocated at. */
static inline bool
SetInitializerObjectType(JSContext *cx, HandleScript script, jsbytecode *pc, HandleObject obj, NewObjectKind kind)
{
if (!cx->typeInferenceEnabled())
return true;
JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(obj->getClass());
JS_ASSERT(key != JSProto_Null);
JS_ASSERT(kind == UseNewTypeForInitializer(script, pc, key));
if (kind == SingletonObject) {
JS_ASSERT(obj->hasSingletonType());
/*
* Inference does not account for types of run-once initializer
* objects, as these may not be created until after the script
* has been analyzed.
*/
TypeScript::Monitor(cx, script, pc, ObjectValue(*obj));
} else {
types::TypeObject *type = TypeScript::InitObject(cx, script, pc, key);
if (!type)
return false;
obj->uninlinedSetType(type);
}
return true;
}
/* static */ inline void
TypeScript::Monitor(JSContext *cx, JSScript *script, jsbytecode *pc, const js::Value &rval)
{
if (cx->typeInferenceEnabled())
TypeMonitorResult(cx, script, pc, rval);
}
/* static */ inline void
TypeScript::Monitor(JSContext *cx, const js::Value &rval)
{
jsbytecode *pc;
RootedScript script(cx, cx->currentScript(&pc));
Monitor(cx, script, pc, rval);
}
/* static */ inline void
TypeScript::MonitorAssign(JSContext *cx, HandleObject obj, jsid id)
{
if (cx->typeInferenceEnabled() && !obj->hasSingletonType()) {
/*
* Mark as unknown any object which has had dynamic assignments to
* non-integer properties at SETELEM opcodes. This avoids making large
* numbers of type properties for hashmap-style objects. We don't need
* to do this for objects with singleton type, because type properties
* are only constructed for them when analyzed scripts depend on those
* specific properties.
*/
uint32_t i;
if (js_IdIsIndex(id, &i))
return;
// But if we don't have too many properties yet, don't do anything. The
// idea here is that normal object initialization should not trigger
// deoptimization in most cases, while actual usage as a hashmap should.
TypeObject* type = obj->type();
if (type->getPropertyCount() < 8)
return;
MarkTypeObjectUnknownProperties(cx, type);
}
}
/* static */ inline void
TypeScript::SetThis(JSContext *cx, JSScript *script, Type type)
{
if (!cx->typeInferenceEnabled() || !script->types)
return;
if (!ThisTypes(script)->hasType(type)) {
AutoEnterAnalysis enter(cx);
InferSpew(ISpewOps, "externalType: setThis #%u: %s",
script->id(), TypeString(type));
ThisTypes(script)->addType(cx, type);
}
}
/* static */ inline void
TypeScript::SetThis(JSContext *cx, JSScript *script, const js::Value &value)
{
if (cx->typeInferenceEnabled())
SetThis(cx, script, GetValueType(value));
}
/* static */ inline void
TypeScript::SetArgument(JSContext *cx, JSScript *script, unsigned arg, Type type)
{
if (!cx->typeInferenceEnabled() || !script->types)
return;
if (!ArgTypes(script, arg)->hasType(type)) {
AutoEnterAnalysis enter(cx);
InferSpew(ISpewOps, "externalType: setArg #%u %u: %s",
script->id(), arg, TypeString(type));
ArgTypes(script, arg)->addType(cx, type);
}
}
/* static */ inline void
TypeScript::SetArgument(JSContext *cx, JSScript *script, unsigned arg, const js::Value &value)
{
if (cx->typeInferenceEnabled()) {
Type type = GetValueType(value);
SetArgument(cx, script, arg, type);
}
}
/////////////////////////////////////////////////////////////////////
// TypeCompartment
/////////////////////////////////////////////////////////////////////
inline JSCompartment *
TypeCompartment::compartment()
{
return (JSCompartment *)((char *)this - offsetof(JSCompartment, types));
}
inline void
TypeCompartment::addPending(JSContext *cx, TypeConstraint *constraint, TypeSet *source, Type type)
{
JS_ASSERT(this == &cx->compartment()->types);
JS_ASSERT(!cx->runtime()->isHeapBusy());
InferSpew(ISpewOps, "pending: %sC%p%s %s",
InferSpewColor(constraint), constraint, InferSpewColorReset(),
TypeString(type));
if ((pendingCount == pendingCapacity) && !growPendingArray(cx))
return;
PendingWork &pending = pendingArray[pendingCount++];
pending.constraint = constraint;
pending.source = source;
pending.type = type;
}
inline void
TypeCompartment::resolvePending(JSContext *cx)
{
JS_ASSERT(this == &cx->compartment()->types);
if (resolving) {
/* There is an active call further up resolving the worklist. */
return;
}
resolving = true;
/* Handle all pending type registrations. */
while (pendingCount) {
const PendingWork &pending = pendingArray[--pendingCount];
InferSpew(ISpewOps, "resolve: %sC%p%s %s",
InferSpewColor(pending.constraint), pending.constraint,
InferSpewColorReset(), TypeString(pending.type));
pending.constraint->newType(cx, pending.source, pending.type);
}
resolving = false;
}
/////////////////////////////////////////////////////////////////////
// TypeSet
/////////////////////////////////////////////////////////////////////
/*
* The sets of objects and scripts in a type set grow monotonically, are usually
* empty, almost always small, and sometimes big. For empty or singleton sets,
* the pointer refers directly to the value. For sets fitting into SET_ARRAY_SIZE,
* an array of this length is used to store the elements. For larger sets, a hash
* table filled to 25%-50% of capacity is used, with collisions resolved by linear
* probing. TODO: replace these with jshashtables.
*/
const unsigned SET_ARRAY_SIZE = 8;
/* Get the capacity of a set with the given element count. */
static inline unsigned
HashSetCapacity(unsigned count)
{
JS_ASSERT(count >= 2);
if (count <= SET_ARRAY_SIZE)
return SET_ARRAY_SIZE;
return 1 << (mozilla::FloorLog2(count) + 2);
}
/* Compute the FNV hash for the low 32 bits of v. */
template <class T, class KEY>
static inline uint32_t
HashKey(T v)
{
uint32_t nv = KEY::keyBits(v);
uint32_t hash = 84696351 ^ (nv & 0xff);
hash = (hash * 16777619) ^ ((nv >> 8) & 0xff);
hash = (hash * 16777619) ^ ((nv >> 16) & 0xff);
return (hash * 16777619) ^ ((nv >> 24) & 0xff);
}
/*
* Insert space for an element into the specified set and grow its capacity if needed.
* returned value is an existing or new entry (nullptr if new).
*/
template <class T, class U, class KEY>
static U **
HashSetInsertTry(LifoAlloc &alloc, U **&values, unsigned &count, T key)
{
unsigned capacity = HashSetCapacity(count);
unsigned insertpos = HashKey<T,KEY>(key) & (capacity - 1);
/* Whether we are converting from a fixed array to hashtable. */
bool converting = (count == SET_ARRAY_SIZE);
if (!converting) {
while (values[insertpos] != nullptr) {
if (KEY::getKey(values[insertpos]) == key)
return &values[insertpos];
insertpos = (insertpos + 1) & (capacity - 1);
}
}
count++;
unsigned newCapacity = HashSetCapacity(count);
if (newCapacity == capacity) {
JS_ASSERT(!converting);
return &values[insertpos];
}
U **newValues = alloc.newArray<U*>(newCapacity);
if (!newValues)
return nullptr;
mozilla::PodZero(newValues, newCapacity);
for (unsigned i = 0; i < capacity; i++) {
if (values[i]) {
unsigned pos = HashKey<T,KEY>(KEY::getKey(values[i])) & (newCapacity - 1);
while (newValues[pos] != nullptr)
pos = (pos + 1) & (newCapacity - 1);
newValues[pos] = values[i];
}
}
values = newValues;
insertpos = HashKey<T,KEY>(key) & (newCapacity - 1);
while (values[insertpos] != nullptr)
insertpos = (insertpos + 1) & (newCapacity - 1);
return &values[insertpos];
}
/*
* Insert an element into the specified set if it is not already there, returning
* an entry which is nullptr if the element was not there.
*/
template <class T, class U, class KEY>
static inline U **
HashSetInsert(LifoAlloc &alloc, U **&values, unsigned &count, T key)
{
if (count == 0) {
JS_ASSERT(values == nullptr);
count++;
return (U **) &values;
}
if (count == 1) {
U *oldData = (U*) values;
if (KEY::getKey(oldData) == key)
return (U **) &values;
values = alloc.newArray<U*>(SET_ARRAY_SIZE);
if (!values) {
values = (U **) oldData;
return nullptr;
}
mozilla::PodZero(values, SET_ARRAY_SIZE);
count++;
values[0] = oldData;
return &values[1];
}
if (count <= SET_ARRAY_SIZE) {
for (unsigned i = 0; i < count; i++) {
if (KEY::getKey(values[i]) == key)
return &values[i];
}
if (count < SET_ARRAY_SIZE) {
count++;
return &values[count - 1];
}
}
return HashSetInsertTry<T,U,KEY>(alloc, values, count, key);
}
/* Lookup an entry in a hash set, return nullptr if it does not exist. */
template <class T, class U, class KEY>
static inline U *
HashSetLookup(U **values, unsigned count, T key)
{
if (count == 0)
return nullptr;
if (count == 1)
return (KEY::getKey((U *) values) == key) ? (U *) values : nullptr;
if (count <= SET_ARRAY_SIZE) {
for (unsigned i = 0; i < count; i++) {
if (KEY::getKey(values[i]) == key)
return values[i];
}
return nullptr;
}
unsigned capacity = HashSetCapacity(count);
unsigned pos = HashKey<T,KEY>(key) & (capacity - 1);
while (values[pos] != nullptr) {
if (KEY::getKey(values[pos]) == key)
return values[pos];
pos = (pos + 1) & (capacity - 1);
}
return nullptr;
}
inline TypeObjectKey *
Type::objectKey() const
{
JS_ASSERT(isObject());
if (isTypeObject())
TypeObject::readBarrier((TypeObject *) data);
else
JSObject::readBarrier((JSObject *) (data ^ 1));
return (TypeObjectKey *) data;
}
inline JSObject *
Type::singleObject() const
{
JS_ASSERT(isSingleObject());
JSObject::readBarrier((JSObject *) (data ^ 1));
return (JSObject *) (data ^ 1);
}
inline TypeObject *
Type::typeObject() const
{
JS_ASSERT(isTypeObject());
TypeObject::readBarrier((TypeObject *) data);
return (TypeObject *) data;
}
inline bool
TypeSet::hasType(Type type) const
{
if (unknown())
return true;
if (type.isUnknown()) {
return false;
} else if (type.isPrimitive()) {
return !!(flags & PrimitiveTypeFlag(type.primitive()));
} else if (type.isAnyObject()) {
return !!(flags & TYPE_FLAG_ANYOBJECT);
} else {
return !!(flags & TYPE_FLAG_ANYOBJECT) ||
HashSetLookup<TypeObjectKey*,TypeObjectKey,TypeObjectKey>
(objectSet, baseObjectCount(), type.objectKey()) != nullptr;
}
}
inline void
TypeSet::setBaseObjectCount(uint32_t count)
{
JS_ASSERT(count <= TYPE_FLAG_OBJECT_COUNT_LIMIT);
flags = (flags & ~TYPE_FLAG_OBJECT_COUNT_MASK)
| (count << TYPE_FLAG_OBJECT_COUNT_SHIFT);
}
inline void
TypeSet::clearObjects()
{
setBaseObjectCount(0);
objectSet = nullptr;
}
bool
TypeSet::addType(Type type, LifoAlloc *alloc, bool *padded)
{
JS_ASSERT_IF(padded, !*padded);
if (unknown())
return true;
if (type.isUnknown()) {
flags |= TYPE_FLAG_BASE_MASK;
clearObjects();
JS_ASSERT(unknown());
if (padded)
*padded = true;
return true;
}
if (type.isPrimitive()) {
TypeFlags flag = PrimitiveTypeFlag(type.primitive());
if (flags & flag)
return true;
/* If we add float to a type set it is also considered to contain int. */
if (flag == TYPE_FLAG_DOUBLE)
flag |= TYPE_FLAG_INT32;
flags |= flag;
if (padded)
*padded = true;
return true;
}
if (flags & TYPE_FLAG_ANYOBJECT)
return true;
if (type.isAnyObject())
goto unknownObject;
{
uint32_t objectCount = baseObjectCount();
TypeObjectKey *object = type.objectKey();
TypeObjectKey **pentry = HashSetInsert<TypeObjectKey *,TypeObjectKey,TypeObjectKey>
(*alloc, objectSet, objectCount, object);
if (!pentry)
return false;
if (*pentry)
return true;
*pentry = object;
setBaseObjectCount(objectCount);
if (objectCount == TYPE_FLAG_OBJECT_COUNT_LIMIT)
goto unknownObject;
}
if (type.isTypeObject()) {
TypeObject *nobject = type.typeObject();
JS_ASSERT(!nobject->singleton);
if (nobject->unknownProperties())
goto unknownObject;
}
if (false) {
unknownObject:
type = Type::AnyObjectType();
flags |= TYPE_FLAG_ANYOBJECT;
clearObjects();
}
if (padded)
*padded = true;
return true;
}
inline void
TypeSet::addType(ExclusiveContext *cxArg, Type type)
{
JS_ASSERT(cxArg->compartment()->activeAnalysis);
// Temporary type sets use a separate LifoAlloc for storage.
JS_ASSERT(isStackSet() || isHeapSet());
bool added = false;
if (!addType(type, &cxArg->typeLifoAlloc(), &added)) {
cxArg->compartment()->types.setPendingNukeTypes(cxArg);
return;
}
if (!added)
return;
InferSpew(ISpewOps, "addType: %sT%p%s %s",
InferSpewColor(this), this, InferSpewColorReset(),
TypeString(type));
/* Propagate the type to all constraints. */
if (JSContext *cx = cxArg->maybeJSContext()) {
TypeConstraint *constraint = constraintList;
while (constraint) {
cx->compartment()->types.addPending(cx, constraint, this, type);
constraint = constraint->next;
}
cx->compartment()->types.resolvePending(cx);
} else {
JS_ASSERT(!constraintList);
}
}
inline void
TypeSet::setConfiguredProperty(ExclusiveContext *cxArg)
{
if (flags & TYPE_FLAG_CONFIGURED_PROPERTY)
return;
flags |= TYPE_FLAG_CONFIGURED_PROPERTY;
/* Propagate the change to all constraints. */
if (JSContext *cx = cxArg->maybeJSContext()) {
TypeConstraint *constraint = constraintList;
while (constraint) {
constraint->newPropertyState(cx, this);
constraint = constraint->next;
}
} else {
JS_ASSERT(!constraintList);
}
}
inline unsigned
TypeSet::getObjectCount() const
{
JS_ASSERT(!unknownObject());
uint32_t count = baseObjectCount();
if (count > SET_ARRAY_SIZE)
return HashSetCapacity(count);
return count;
}
inline TypeObjectKey *
TypeSet::getObject(unsigned i) const
{
JS_ASSERT(i < getObjectCount());
if (baseObjectCount() == 1) {
JS_ASSERT(i == 0);
return (TypeObjectKey *) objectSet;
}
return objectSet[i];
}
inline JSObject *
TypeSet::getSingleObject(unsigned i) const
{
TypeObjectKey *key = getObject(i);
return (key && key->isSingleObject()) ? key->asSingleObject() : nullptr;
}
inline TypeObject *
TypeSet::getTypeObject(unsigned i) const
{
TypeObjectKey *key = getObject(i);
return (key && key->isTypeObject()) ? key->asTypeObject() : nullptr;
}
inline bool
TypeSet::getTypeOrSingleObject(JSContext *cx, unsigned i, TypeObject **result) const
{
JS_ASSERT(result);
JS_ASSERT(cx->compartment()->activeAnalysis);
*result = nullptr;
TypeObject *type = getTypeObject(i);
if (!type) {
JSObject *singleton = getSingleObject(i);
if (!singleton)
return true;
type = singleton->uninlinedGetType(cx);
if (!type) {
cx->compartment()->types.setPendingNukeTypes(cx);
return false;
}
}
*result = type;
return true;
}
inline const Class *
TypeSet::getObjectClass(unsigned i) const
{
if (JSObject *object = getSingleObject(i))
return object->getClass();
if (TypeObject *object = getTypeObject(i))
return object->clasp;
return nullptr;
}
/////////////////////////////////////////////////////////////////////
// TypeObject
/////////////////////////////////////////////////////////////////////
inline TypeObject::TypeObject(const Class *clasp, TaggedProto proto, bool unknown)
{
mozilla::PodZero(this);
/* Inner objects may not appear on prototype chains. */
JS_ASSERT_IF(proto.isObject(), !proto.toObject()->getClass()->ext.outerObject);
this->clasp = clasp;
this->proto = proto.raw();
if (unknown)
flags |= OBJECT_FLAG_UNKNOWN_MASK;
InferSpew(ISpewOps, "newObject: %s", TypeObjectString(this));
}
inline uint32_t
TypeObject::basePropertyCount() const
{
return (flags & OBJECT_FLAG_PROPERTY_COUNT_MASK) >> OBJECT_FLAG_PROPERTY_COUNT_SHIFT;
}
inline void
TypeObject::setBasePropertyCount(uint32_t count)
{
JS_ASSERT(count <= OBJECT_FLAG_PROPERTY_COUNT_LIMIT);
flags = (flags & ~OBJECT_FLAG_PROPERTY_COUNT_MASK)
| (count << OBJECT_FLAG_PROPERTY_COUNT_SHIFT);
}
inline HeapTypeSet *
TypeObject::getProperty(ExclusiveContext *cx, jsid id)
{
JS_ASSERT(cx->compartment()->activeAnalysis);
JS_ASSERT(JSID_IS_VOID(id) || JSID_IS_EMPTY(id) || JSID_IS_STRING(id));
JS_ASSERT_IF(!JSID_IS_EMPTY(id), id == IdToTypeId(id));
JS_ASSERT(!unknownProperties());
uint32_t propertyCount = basePropertyCount();
Property **pprop = HashSetInsert<jsid,Property,Property>
(cx->typeLifoAlloc(), propertySet, propertyCount, id);
if (!pprop) {
cx->compartment()->types.setPendingNukeTypes(cx);
return nullptr;
}
if (!*pprop) {
setBasePropertyCount(propertyCount);
if (!addProperty(cx, id, pprop)) {
setBasePropertyCount(0);
propertySet = nullptr;
return nullptr;
}
if (propertyCount == OBJECT_FLAG_PROPERTY_COUNT_LIMIT) {
markUnknown(cx);
/*
* Return an arbitrary property in the object, as all have unknown
* type and are treated as configured.
*/
unsigned count = getPropertyCount();
for (unsigned i = 0; i < count; i++) {
if (Property *prop = getProperty(i))
return &prop->types;
}
MOZ_ASSUME_UNREACHABLE("Missing property");
}
}
return &(*pprop)->types;
}
inline HeapTypeSet *
TypeObject::maybeGetProperty(jsid id)
{
JS_ASSERT(JSID_IS_VOID(id) || JSID_IS_EMPTY(id) || JSID_IS_STRING(id));
JS_ASSERT_IF(!JSID_IS_EMPTY(id), id == IdToTypeId(id));
JS_ASSERT(!unknownProperties());
Property *prop = HashSetLookup<jsid,Property,Property>
(propertySet, basePropertyCount(), id);
return prop ? &prop->types : nullptr;
}
inline unsigned
TypeObject::getPropertyCount()
{
uint32_t count = basePropertyCount();
if (count > SET_ARRAY_SIZE)
return HashSetCapacity(count);
return count;
}
inline Property *
TypeObject::getProperty(unsigned i)
{
JS_ASSERT(i < getPropertyCount());
if (basePropertyCount() == 1) {
JS_ASSERT(i == 0);
return (Property *) propertySet;
}
return propertySet[i];
}
inline void
TypeObjectAddendum::writeBarrierPre(TypeObjectAddendum *type)
{
#ifdef JSGC_INCREMENTAL
if (!type)
return;
switch (type->kind) {
case NewScript:
return TypeNewScript::writeBarrierPre(type->asNewScript());
case TypedObject:
return TypeTypedObject::writeBarrierPre(type->asTypedObject());
}
#endif
}
inline void
TypeNewScript::writeBarrierPre(TypeNewScript *newScript)
{
#ifdef JSGC_INCREMENTAL
if (!newScript || !newScript->fun->runtimeFromAnyThread()->needsBarrier())
return;
JS::Zone *zone = newScript->fun->zoneFromAnyThread();
if (zone->needsBarrier()) {
MarkObject(zone->barrierTracer(), &newScript->fun, "write barrier");
MarkObject(zone->barrierTracer(), &newScript->templateObject, "write barrier");
}
#endif
}
} } /* namespace js::types */
inline bool
JSScript::ensureHasTypes(JSContext *cx)
{
return types || makeTypes(cx);
}
inline bool
JSScript::ensureHasBytecodeTypeMap(JSContext *cx)
{
return ensureHasTypes(cx) && (types->bytecodeMap || makeBytecodeTypeMap(cx));
}
inline bool
JSScript::ensureRanAnalysis(JSContext *cx)
{
js::types::AutoEnterAnalysis aea(cx);
if (!ensureHasTypes(cx))
return false;
if (!hasAnalysis() && !makeAnalysis(cx))
return false;
JS_ASSERT(analysis()->ranBytecode());
return true;
}
inline bool
JSScript::hasAnalysis()
{
return types && types->analysis;
}
inline js::analyze::ScriptAnalysis *
JSScript::analysis()
{
JS_ASSERT(hasAnalysis());
return types->analysis;
}
inline void
JSScript::clearAnalysis()
{
if (types) {
types->analysis = nullptr;
types->bytecodeMap = nullptr;
}
}
namespace js {
template <>
struct GCMethods<const types::Type>
{
static types::Type initial() { return types::Type::UnknownType(); }
static ThingRootKind kind() { return THING_ROOT_TYPE; }
static bool poisoned(const types::Type &v) {
return (v.isTypeObject() && IsPoisonedPtr(v.typeObject()))
|| (v.isSingleObject() && IsPoisonedPtr(v.singleObject()));
}
};
template <>
struct GCMethods<types::Type>
{
static types::Type initial() { return types::Type::UnknownType(); }
static ThingRootKind kind() { return THING_ROOT_TYPE; }
static bool poisoned(const types::Type &v) {
return (v.isTypeObject() && IsPoisonedPtr(v.typeObject()))
|| (v.isSingleObject() && IsPoisonedPtr(v.singleObject()));
}
};
} // namespace js
namespace JS {
template<> class AnchorPermitted<js::types::TypeObject *> { };
} // namespace JS
#endif /* jsinferinlines_h */
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