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runtime.cc
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runtime.cc
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// Copyright 2006-2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdlib.h>
#include "v8.h"
#include "accessors.h"
#include "api.h"
#include "arguments.h"
#include "compiler.h"
#include "cpu.h"
#include "dateparser-inl.h"
#include "debug.h"
#include "execution.h"
#include "jsregexp.h"
#include "parser.h"
#include "platform.h"
#include "runtime.h"
#include "scopeinfo.h"
#include "smart-pointer.h"
#include "stub-cache.h"
#include "v8threads.h"
namespace v8 {
namespace internal {
#define RUNTIME_ASSERT(value) \
if (!(value)) return Top::ThrowIllegalOperation();
// Cast the given object to a value of the specified type and store
// it in a variable with the given name. If the object is not of the
// expected type call IllegalOperation and return.
#define CONVERT_CHECKED(Type, name, obj) \
RUNTIME_ASSERT(obj->Is##Type()); \
Type* name = Type::cast(obj);
#define CONVERT_ARG_CHECKED(Type, name, index) \
RUNTIME_ASSERT(args[index]->Is##Type()); \
Handle<Type> name = args.at<Type>(index);
// Cast the given object to a boolean and store it in a variable with
// the given name. If the object is not a boolean call IllegalOperation
// and return.
#define CONVERT_BOOLEAN_CHECKED(name, obj) \
RUNTIME_ASSERT(obj->IsBoolean()); \
bool name = (obj)->IsTrue();
// Cast the given object to a Smi and store its value in an int variable
// with the given name. If the object is not a Smi call IllegalOperation
// and return.
#define CONVERT_SMI_CHECKED(name, obj) \
RUNTIME_ASSERT(obj->IsSmi()); \
int name = Smi::cast(obj)->value();
// Cast the given object to a double and store it in a variable with
// the given name. If the object is not a number (as opposed to
// the number not-a-number) call IllegalOperation and return.
#define CONVERT_DOUBLE_CHECKED(name, obj) \
RUNTIME_ASSERT(obj->IsNumber()); \
double name = (obj)->Number();
// Call the specified converter on the object *comand store the result in
// a variable of the specified type with the given name. If the
// object is not a Number call IllegalOperation and return.
#define CONVERT_NUMBER_CHECKED(type, name, Type, obj) \
RUNTIME_ASSERT(obj->IsNumber()); \
type name = NumberTo##Type(obj);
// Non-reentrant string buffer for efficient general use in this file.
static StaticResource<StringInputBuffer> runtime_string_input_buffer;
static Object* DeepCopyBoilerplate(JSObject* boilerplate) {
StackLimitCheck check;
if (check.HasOverflowed()) return Top::StackOverflow();
Object* result = Heap::CopyJSObject(boilerplate);
if (result->IsFailure()) return result;
JSObject* copy = JSObject::cast(result);
// Deep copy local properties.
if (copy->HasFastProperties()) {
FixedArray* properties = copy->properties();
WriteBarrierMode mode = properties->GetWriteBarrierMode();
for (int i = 0; i < properties->length(); i++) {
Object* value = properties->get(i);
if (value->IsJSObject()) {
JSObject* jsObject = JSObject::cast(value);
result = DeepCopyBoilerplate(jsObject);
if (result->IsFailure()) return result;
properties->set(i, result, mode);
}
}
mode = copy->GetWriteBarrierMode();
int nof = copy->map()->inobject_properties();
for (int i = 0; i < nof; i++) {
Object* value = copy->InObjectPropertyAt(i);
if (value->IsJSObject()) {
JSObject* jsObject = JSObject::cast(value);
result = DeepCopyBoilerplate(jsObject);
if (result->IsFailure()) return result;
copy->InObjectPropertyAtPut(i, result, mode);
}
}
} else {
result = Heap::AllocateFixedArray(copy->NumberOfLocalProperties(NONE));
if (result->IsFailure()) return result;
FixedArray* names = FixedArray::cast(result);
copy->GetLocalPropertyNames(names, 0);
for (int i = 0; i < names->length(); i++) {
ASSERT(names->get(i)->IsString());
String* keyString = String::cast(names->get(i));
PropertyAttributes attributes =
copy->GetLocalPropertyAttribute(keyString);
// Only deep copy fields from the object literal expression.
// In particular, don't try to copy the length attribute of
// an array.
if (attributes != NONE) continue;
Object* value = copy->GetProperty(keyString, &attributes);
ASSERT(!value->IsFailure());
if (value->IsJSObject()) {
JSObject* jsObject = JSObject::cast(value);
result = DeepCopyBoilerplate(jsObject);
if (result->IsFailure()) return result;
result = copy->SetProperty(keyString, result, NONE);
if (result->IsFailure()) return result;
}
}
}
// Deep copy local elements.
// Pixel elements cannot be created using an object literal.
ASSERT(!copy->HasPixelElements() && !copy->HasExternalArrayElements());
switch (copy->GetElementsKind()) {
case JSObject::FAST_ELEMENTS: {
FixedArray* elements = FixedArray::cast(copy->elements());
WriteBarrierMode mode = elements->GetWriteBarrierMode();
for (int i = 0; i < elements->length(); i++) {
Object* value = elements->get(i);
if (value->IsJSObject()) {
JSObject* jsObject = JSObject::cast(value);
result = DeepCopyBoilerplate(jsObject);
if (result->IsFailure()) return result;
elements->set(i, result, mode);
}
}
break;
}
case JSObject::DICTIONARY_ELEMENTS: {
NumberDictionary* element_dictionary = copy->element_dictionary();
int capacity = element_dictionary->Capacity();
for (int i = 0; i < capacity; i++) {
Object* k = element_dictionary->KeyAt(i);
if (element_dictionary->IsKey(k)) {
Object* value = element_dictionary->ValueAt(i);
if (value->IsJSObject()) {
JSObject* jsObject = JSObject::cast(value);
result = DeepCopyBoilerplate(jsObject);
if (result->IsFailure()) return result;
element_dictionary->ValueAtPut(i, result);
}
}
}
break;
}
default:
UNREACHABLE();
break;
}
return copy;
}
static Object* Runtime_CloneLiteralBoilerplate(Arguments args) {
CONVERT_CHECKED(JSObject, boilerplate, args[0]);
return DeepCopyBoilerplate(boilerplate);
}
static Object* Runtime_CloneShallowLiteralBoilerplate(Arguments args) {
CONVERT_CHECKED(JSObject, boilerplate, args[0]);
return Heap::CopyJSObject(boilerplate);
}
static Handle<Map> ComputeObjectLiteralMap(
Handle<Context> context,
Handle<FixedArray> constant_properties,
bool* is_result_from_cache) {
int number_of_properties = constant_properties->length() / 2;
if (FLAG_canonicalize_object_literal_maps) {
// First find prefix of consecutive symbol keys.
int number_of_symbol_keys = 0;
while ((number_of_symbol_keys < number_of_properties) &&
(constant_properties->get(number_of_symbol_keys*2)->IsSymbol())) {
number_of_symbol_keys++;
}
// Based on the number of prefix symbols key we decide whether
// to use the map cache in the global context.
const int kMaxKeys = 10;
if ((number_of_symbol_keys == number_of_properties) &&
(number_of_symbol_keys < kMaxKeys)) {
// Create the fixed array with the key.
Handle<FixedArray> keys = Factory::NewFixedArray(number_of_symbol_keys);
for (int i = 0; i < number_of_symbol_keys; i++) {
keys->set(i, constant_properties->get(i*2));
}
*is_result_from_cache = true;
return Factory::ObjectLiteralMapFromCache(context, keys);
}
}
*is_result_from_cache = false;
return Factory::CopyMap(
Handle<Map>(context->object_function()->initial_map()),
number_of_properties);
}
static Handle<Object> CreateLiteralBoilerplate(
Handle<FixedArray> literals,
Handle<FixedArray> constant_properties);
static Handle<Object> CreateObjectLiteralBoilerplate(
Handle<FixedArray> literals,
Handle<FixedArray> constant_properties) {
// Get the global context from the literals array. This is the
// context in which the function was created and we use the object
// function from this context to create the object literal. We do
// not use the object function from the current global context
// because this might be the object function from another context
// which we should not have access to.
Handle<Context> context =
Handle<Context>(JSFunction::GlobalContextFromLiterals(*literals));
bool is_result_from_cache;
Handle<Map> map = ComputeObjectLiteralMap(context,
constant_properties,
&is_result_from_cache);
Handle<JSObject> boilerplate = Factory::NewJSObjectFromMap(map);
{ // Add the constant properties to the boilerplate.
int length = constant_properties->length();
OptimizedObjectForAddingMultipleProperties opt(boilerplate,
length / 2,
!is_result_from_cache);
for (int index = 0; index < length; index +=2) {
Handle<Object> key(constant_properties->get(index+0));
Handle<Object> value(constant_properties->get(index+1));
if (value->IsFixedArray()) {
// The value contains the constant_properties of a
// simple object literal.
Handle<FixedArray> array = Handle<FixedArray>::cast(value);
value = CreateLiteralBoilerplate(literals, array);
if (value.is_null()) return value;
}
Handle<Object> result;
uint32_t element_index = 0;
if (key->IsSymbol()) {
// If key is a symbol it is not an array element.
Handle<String> name(String::cast(*key));
ASSERT(!name->AsArrayIndex(&element_index));
result = SetProperty(boilerplate, name, value, NONE);
} else if (Array::IndexFromObject(*key, &element_index)) {
// Array index (uint32).
result = SetElement(boilerplate, element_index, value);
} else {
// Non-uint32 number.
ASSERT(key->IsNumber());
double num = key->Number();
char arr[100];
Vector<char> buffer(arr, ARRAY_SIZE(arr));
const char* str = DoubleToCString(num, buffer);
Handle<String> name = Factory::NewStringFromAscii(CStrVector(str));
result = SetProperty(boilerplate, name, value, NONE);
}
// If setting the property on the boilerplate throws an
// exception, the exception is converted to an empty handle in
// the handle based operations. In that case, we need to
// convert back to an exception.
if (result.is_null()) return result;
}
}
return boilerplate;
}
static Handle<Object> CreateArrayLiteralBoilerplate(
Handle<FixedArray> literals,
Handle<FixedArray> elements) {
// Create the JSArray.
Handle<JSFunction> constructor(
JSFunction::GlobalContextFromLiterals(*literals)->array_function());
Handle<Object> object = Factory::NewJSObject(constructor);
Handle<Object> copied_elements = Factory::CopyFixedArray(elements);
Handle<FixedArray> content = Handle<FixedArray>::cast(copied_elements);
for (int i = 0; i < content->length(); i++) {
if (content->get(i)->IsFixedArray()) {
// The value contains the constant_properties of a
// simple object literal.
Handle<FixedArray> fa(FixedArray::cast(content->get(i)));
Handle<Object> result =
CreateLiteralBoilerplate(literals, fa);
if (result.is_null()) return result;
content->set(i, *result);
}
}
// Set the elements.
Handle<JSArray>::cast(object)->SetContent(*content);
return object;
}
static Handle<Object> CreateLiteralBoilerplate(
Handle<FixedArray> literals,
Handle<FixedArray> array) {
Handle<FixedArray> elements = CompileTimeValue::GetElements(array);
switch (CompileTimeValue::GetType(array)) {
case CompileTimeValue::OBJECT_LITERAL:
return CreateObjectLiteralBoilerplate(literals, elements);
case CompileTimeValue::ARRAY_LITERAL:
return CreateArrayLiteralBoilerplate(literals, elements);
default:
UNREACHABLE();
return Handle<Object>::null();
}
}
static Object* Runtime_CreateObjectLiteralBoilerplate(Arguments args) {
HandleScope scope;
ASSERT(args.length() == 3);
// Copy the arguments.
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, constant_properties, 2);
Handle<Object> result =
CreateObjectLiteralBoilerplate(literals, constant_properties);
if (result.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *result);
return *result;
}
static Object* Runtime_CreateArrayLiteralBoilerplate(Arguments args) {
// Takes a FixedArray of elements containing the literal elements of
// the array literal and produces JSArray with those elements.
// Additionally takes the literals array of the surrounding function
// which contains the context from which to get the Array function
// to use for creating the array literal.
HandleScope scope;
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, elements, 2);
Handle<Object> object = CreateArrayLiteralBoilerplate(literals, elements);
if (object.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *object);
return *object;
}
static Object* Runtime_CreateObjectLiteral(Arguments args) {
HandleScope scope;
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, constant_properties, 2);
// Check if boilerplate exists. If not, create it first.
Handle<Object> boilerplate(literals->get(literals_index));
if (*boilerplate == Heap::undefined_value()) {
boilerplate = CreateObjectLiteralBoilerplate(literals, constant_properties);
if (boilerplate.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *boilerplate);
}
return DeepCopyBoilerplate(JSObject::cast(*boilerplate));
}
static Object* Runtime_CreateObjectLiteralShallow(Arguments args) {
HandleScope scope;
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, constant_properties, 2);
// Check if boilerplate exists. If not, create it first.
Handle<Object> boilerplate(literals->get(literals_index));
if (*boilerplate == Heap::undefined_value()) {
boilerplate = CreateObjectLiteralBoilerplate(literals, constant_properties);
if (boilerplate.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *boilerplate);
}
return Heap::CopyJSObject(JSObject::cast(*boilerplate));
}
static Object* Runtime_CreateArrayLiteral(Arguments args) {
HandleScope scope;
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, elements, 2);
// Check if boilerplate exists. If not, create it first.
Handle<Object> boilerplate(literals->get(literals_index));
if (*boilerplate == Heap::undefined_value()) {
boilerplate = CreateArrayLiteralBoilerplate(literals, elements);
if (boilerplate.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *boilerplate);
}
return DeepCopyBoilerplate(JSObject::cast(*boilerplate));
}
static Object* Runtime_CreateArrayLiteralShallow(Arguments args) {
HandleScope scope;
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(FixedArray, literals, 0);
CONVERT_SMI_CHECKED(literals_index, args[1]);
CONVERT_ARG_CHECKED(FixedArray, elements, 2);
// Check if boilerplate exists. If not, create it first.
Handle<Object> boilerplate(literals->get(literals_index));
if (*boilerplate == Heap::undefined_value()) {
boilerplate = CreateArrayLiteralBoilerplate(literals, elements);
if (boilerplate.is_null()) return Failure::Exception();
// Update the functions literal and return the boilerplate.
literals->set(literals_index, *boilerplate);
}
return Heap::CopyJSObject(JSObject::cast(*boilerplate));
}
static Object* Runtime_CreateCatchExtensionObject(Arguments args) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(String, key, args[0]);
Object* value = args[1];
// Create a catch context extension object.
JSFunction* constructor =
Top::context()->global_context()->context_extension_function();
Object* object = Heap::AllocateJSObject(constructor);
if (object->IsFailure()) return object;
// Assign the exception value to the catch variable and make sure
// that the catch variable is DontDelete.
value = JSObject::cast(object)->SetProperty(key, value, DONT_DELETE);
if (value->IsFailure()) return value;
return object;
}
static Object* Runtime_ClassOf(Arguments args) {
NoHandleAllocation ha;
ASSERT(args.length() == 1);
Object* obj = args[0];
if (!obj->IsJSObject()) return Heap::null_value();
return JSObject::cast(obj)->class_name();
}
static Object* Runtime_IsInPrototypeChain(Arguments args) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
// See ECMA-262, section 15.3.5.3, page 88 (steps 5 - 8).
Object* O = args[0];
Object* V = args[1];
while (true) {
Object* prototype = V->GetPrototype();
if (prototype->IsNull()) return Heap::false_value();
if (O == prototype) return Heap::true_value();
V = prototype;
}
}
// Inserts an object as the hidden prototype of another object.
static Object* Runtime_SetHiddenPrototype(Arguments args) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_CHECKED(JSObject, jsobject, args[0]);
CONVERT_CHECKED(JSObject, proto, args[1]);
// Sanity checks. The old prototype (that we are replacing) could
// theoretically be null, but if it is not null then check that we
// didn't already install a hidden prototype here.
RUNTIME_ASSERT(!jsobject->GetPrototype()->IsHeapObject() ||
!HeapObject::cast(jsobject->GetPrototype())->map()->is_hidden_prototype());
RUNTIME_ASSERT(!proto->map()->is_hidden_prototype());
// Allocate up front before we start altering state in case we get a GC.
Object* map_or_failure = proto->map()->CopyDropTransitions();
if (map_or_failure->IsFailure()) return map_or_failure;
Map* new_proto_map = Map::cast(map_or_failure);
map_or_failure = jsobject->map()->CopyDropTransitions();
if (map_or_failure->IsFailure()) return map_or_failure;
Map* new_map = Map::cast(map_or_failure);
// Set proto's prototype to be the old prototype of the object.
new_proto_map->set_prototype(jsobject->GetPrototype());
proto->set_map(new_proto_map);
new_proto_map->set_is_hidden_prototype();
// Set the object's prototype to proto.
new_map->set_prototype(proto);
jsobject->set_map(new_map);
return Heap::undefined_value();
}
static Object* Runtime_IsConstructCall(Arguments args) {
NoHandleAllocation ha;
ASSERT(args.length() == 0);
JavaScriptFrameIterator it;
return Heap::ToBoolean(it.frame()->IsConstructor());
}
// Recursively traverses hidden prototypes if property is not found
static void GetOwnPropertyImplementation(JSObject* obj,
String* name,
LookupResult* result) {
obj->LocalLookupRealNamedProperty(name, result);
if (!result->IsProperty()) {
Object* proto = obj->GetPrototype();
if (proto->IsJSObject() &&
JSObject::cast(proto)->map()->is_hidden_prototype())
GetOwnPropertyImplementation(JSObject::cast(proto),
name, result);
}
}
// Returns an array with the property description:
// if args[1] is not a property on args[0]
// returns undefined
// if args[1] is a data property on args[0]
// [false, value, Writeable, Enumerable, Configurable]
// if args[1] is an accessor on args[0]
// [true, GetFunction, SetFunction, Enumerable, Configurable]
static Object* Runtime_GetOwnProperty(Arguments args) {
HandleScope scope;
Handle<FixedArray> elms = Factory::NewFixedArray(5);
Handle<JSArray> desc = Factory::NewJSArrayWithElements(elms);
LookupResult result;
CONVERT_CHECKED(JSObject, obj, args[0]);
CONVERT_CHECKED(String, name, args[1]);
// Use recursive implementation to also traverse hidden prototypes
GetOwnPropertyImplementation(obj, name, &result);
if (!result.IsProperty())
return Heap::undefined_value();
if (result.type() == CALLBACKS) {
Object* structure = result.GetCallbackObject();
if (structure->IsProxy()) {
// Property that is internally implemented as a callback.
Object* value = obj->GetPropertyWithCallback(
obj, structure, name, result.holder());
elms->set(0, Heap::false_value());
elms->set(1, value);
elms->set(2, Heap::ToBoolean(!result.IsReadOnly()));
} else if (structure->IsFixedArray()) {
// __defineGetter__/__defineSetter__ callback.
elms->set(0, Heap::true_value());
elms->set(1, FixedArray::cast(structure)->get(0));
elms->set(2, FixedArray::cast(structure)->get(1));
} else {
// TODO(ricow): Handle API callbacks.
return Heap::undefined_value();
}
} else {
elms->set(0, Heap::false_value());
elms->set(1, result.GetLazyValue());
elms->set(2, Heap::ToBoolean(!result.IsReadOnly()));
}
elms->set(3, Heap::ToBoolean(!result.IsDontEnum()));
elms->set(4, Heap::ToBoolean(!result.IsReadOnly()));
return *desc;
}
static Object* Runtime_RegExpCompile(Arguments args) {
HandleScope scope;
ASSERT(args.length() == 3);
CONVERT_ARG_CHECKED(JSRegExp, re, 0);
CONVERT_ARG_CHECKED(String, pattern, 1);
CONVERT_ARG_CHECKED(String, flags, 2);
Handle<Object> result = RegExpImpl::Compile(re, pattern, flags);
if (result.is_null()) return Failure::Exception();
return *result;
}
static Object* Runtime_CreateApiFunction(Arguments args) {
HandleScope scope;
ASSERT(args.length() == 1);
CONVERT_ARG_CHECKED(FunctionTemplateInfo, data, 0);
return *Factory::CreateApiFunction(data);
}
static Object* Runtime_IsTemplate(Arguments args) {
ASSERT(args.length() == 1);
Object* arg = args[0];
bool result = arg->IsObjectTemplateInfo() || arg->IsFunctionTemplateInfo();
return Heap::ToBoolean(result);
}
static Object* Runtime_GetTemplateField(Arguments args) {
ASSERT(args.length() == 2);
CONVERT_CHECKED(HeapObject, templ, args[0]);
CONVERT_CHECKED(Smi, field, args[1]);
int index = field->value();
int offset = index * kPointerSize + HeapObject::kHeaderSize;
InstanceType type = templ->map()->instance_type();
RUNTIME_ASSERT(type == FUNCTION_TEMPLATE_INFO_TYPE ||
type == OBJECT_TEMPLATE_INFO_TYPE);
RUNTIME_ASSERT(offset > 0);
if (type == FUNCTION_TEMPLATE_INFO_TYPE) {
RUNTIME_ASSERT(offset < FunctionTemplateInfo::kSize);
} else {
RUNTIME_ASSERT(offset < ObjectTemplateInfo::kSize);
}
return *HeapObject::RawField(templ, offset);
}
static Object* Runtime_DisableAccessChecks(Arguments args) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(HeapObject, object, args[0]);
Map* old_map = object->map();
bool needs_access_checks = old_map->is_access_check_needed();
if (needs_access_checks) {
// Copy map so it won't interfere constructor's initial map.
Object* new_map = old_map->CopyDropTransitions();
if (new_map->IsFailure()) return new_map;
Map::cast(new_map)->set_is_access_check_needed(false);
object->set_map(Map::cast(new_map));
}
return needs_access_checks ? Heap::true_value() : Heap::false_value();
}
static Object* Runtime_EnableAccessChecks(Arguments args) {
ASSERT(args.length() == 1);
CONVERT_CHECKED(HeapObject, object, args[0]);
Map* old_map = object->map();
if (!old_map->is_access_check_needed()) {
// Copy map so it won't interfere constructor's initial map.
Object* new_map = old_map->CopyDropTransitions();
if (new_map->IsFailure()) return new_map;
Map::cast(new_map)->set_is_access_check_needed(true);
object->set_map(Map::cast(new_map));
}
return Heap::undefined_value();
}
static Object* ThrowRedeclarationError(const char* type, Handle<String> name) {
HandleScope scope;
Handle<Object> type_handle = Factory::NewStringFromAscii(CStrVector(type));
Handle<Object> args[2] = { type_handle, name };
Handle<Object> error =
Factory::NewTypeError("redeclaration", HandleVector(args, 2));
return Top::Throw(*error);
}
static Object* Runtime_DeclareGlobals(Arguments args) {
HandleScope scope;
Handle<GlobalObject> global = Handle<GlobalObject>(Top::context()->global());
Handle<Context> context = args.at<Context>(0);
CONVERT_ARG_CHECKED(FixedArray, pairs, 1);
bool is_eval = Smi::cast(args[2])->value() == 1;
// Compute the property attributes. According to ECMA-262, section
// 13, page 71, the property must be read-only and
// non-deletable. However, neither SpiderMonkey nor KJS creates the
// property as read-only, so we don't either.
PropertyAttributes base = is_eval ? NONE : DONT_DELETE;
// Traverse the name/value pairs and set the properties.
int length = pairs->length();
for (int i = 0; i < length; i += 2) {
HandleScope scope;
Handle<String> name(String::cast(pairs->get(i)));
Handle<Object> value(pairs->get(i + 1));
// We have to declare a global const property. To capture we only
// assign to it when evaluating the assignment for "const x =
// <expr>" the initial value is the hole.
bool is_const_property = value->IsTheHole();
if (value->IsUndefined() || is_const_property) {
// Lookup the property in the global object, and don't set the
// value of the variable if the property is already there.
LookupResult lookup;
global->Lookup(*name, &lookup);
if (lookup.IsProperty()) {
// Determine if the property is local by comparing the holder
// against the global object. The information will be used to
// avoid throwing re-declaration errors when declaring
// variables or constants that exist in the prototype chain.
bool is_local = (*global == lookup.holder());
// Get the property attributes and determine if the property is
// read-only.
PropertyAttributes attributes = global->GetPropertyAttribute(*name);
bool is_read_only = (attributes & READ_ONLY) != 0;
if (lookup.type() == INTERCEPTOR) {
// If the interceptor says the property is there, we
// just return undefined without overwriting the property.
// Otherwise, we continue to setting the property.
if (attributes != ABSENT) {
// Check if the existing property conflicts with regards to const.
if (is_local && (is_read_only || is_const_property)) {
const char* type = (is_read_only) ? "const" : "var";
return ThrowRedeclarationError(type, name);
};
// The property already exists without conflicting: Go to
// the next declaration.
continue;
}
// Fall-through and introduce the absent property by using
// SetProperty.
} else {
if (is_local && (is_read_only || is_const_property)) {
const char* type = (is_read_only) ? "const" : "var";
return ThrowRedeclarationError(type, name);
}
// The property already exists without conflicting: Go to
// the next declaration.
continue;
}
}
} else {
// Copy the function and update its context. Use it as value.
Handle<JSFunction> boilerplate = Handle<JSFunction>::cast(value);
Handle<JSFunction> function =
Factory::NewFunctionFromBoilerplate(boilerplate, context, TENURED);
value = function;
}
LookupResult lookup;
global->LocalLookup(*name, &lookup);
PropertyAttributes attributes = is_const_property
? static_cast<PropertyAttributes>(base | READ_ONLY)
: base;
if (lookup.IsProperty()) {
// There's a local property that we need to overwrite because
// we're either declaring a function or there's an interceptor
// that claims the property is absent.
// Check for conflicting re-declarations. We cannot have
// conflicting types in case of intercepted properties because
// they are absent.
if (lookup.type() != INTERCEPTOR &&
(lookup.IsReadOnly() || is_const_property)) {
const char* type = (lookup.IsReadOnly()) ? "const" : "var";
return ThrowRedeclarationError(type, name);
}
SetProperty(global, name, value, attributes);
} else {
// If a property with this name does not already exist on the
// global object add the property locally. We take special
// precautions to always add it as a local property even in case
// of callbacks in the prototype chain (this rules out using
// SetProperty). Also, we must use the handle-based version to
// avoid GC issues.
IgnoreAttributesAndSetLocalProperty(global, name, value, attributes);
}
}
return Heap::undefined_value();
}
static Object* Runtime_DeclareContextSlot(Arguments args) {
HandleScope scope;
ASSERT(args.length() == 4);
CONVERT_ARG_CHECKED(Context, context, 0);
Handle<String> name(String::cast(args[1]));
PropertyAttributes mode =
static_cast<PropertyAttributes>(Smi::cast(args[2])->value());
ASSERT(mode == READ_ONLY || mode == NONE);
Handle<Object> initial_value(args[3]);
// Declarations are always done in the function context.
context = Handle<Context>(context->fcontext());
int index;
PropertyAttributes attributes;
ContextLookupFlags flags = DONT_FOLLOW_CHAINS;
Handle<Object> holder =
context->Lookup(name, flags, &index, &attributes);
if (attributes != ABSENT) {
// The name was declared before; check for conflicting
// re-declarations: This is similar to the code in parser.cc in
// the AstBuildingParser::Declare function.
if (((attributes & READ_ONLY) != 0) || (mode == READ_ONLY)) {
// Functions are not read-only.
ASSERT(mode != READ_ONLY || initial_value->IsTheHole());
const char* type = ((attributes & READ_ONLY) != 0) ? "const" : "var";
return ThrowRedeclarationError(type, name);
}
// Initialize it if necessary.
if (*initial_value != NULL) {
if (index >= 0) {
// The variable or constant context slot should always be in
// the function context or the arguments object.
if (holder->IsContext()) {
ASSERT(holder.is_identical_to(context));
if (((attributes & READ_ONLY) == 0) ||
context->get(index)->IsTheHole()) {
context->set(index, *initial_value);
}
} else {
Handle<JSObject>::cast(holder)->SetElement(index, *initial_value);
}
} else {
// Slow case: The property is not in the FixedArray part of the context.
Handle<JSObject> context_ext = Handle<JSObject>::cast(holder);
SetProperty(context_ext, name, initial_value, mode);
}
}
} else {
// The property is not in the function context. It needs to be
// "declared" in the function context's extension context, or in the
// global context.
Handle<JSObject> context_ext;
if (context->has_extension()) {
// The function context's extension context exists - use it.
context_ext = Handle<JSObject>(context->extension());
} else {
// The function context's extension context does not exists - allocate
// it.
context_ext = Factory::NewJSObject(Top::context_extension_function());
// And store it in the extension slot.
context->set_extension(*context_ext);
}
ASSERT(*context_ext != NULL);
// Declare the property by setting it to the initial value if provided,
// or undefined, and use the correct mode (e.g. READ_ONLY attribute for
// constant declarations).
ASSERT(!context_ext->HasLocalProperty(*name));
Handle<Object> value(Heap::undefined_value());
if (*initial_value != NULL) value = initial_value;
SetProperty(context_ext, name, value, mode);
ASSERT(context_ext->GetLocalPropertyAttribute(*name) == mode);
}
return Heap::undefined_value();
}
static Object* Runtime_InitializeVarGlobal(Arguments args) {
NoHandleAllocation nha;
// Determine if we need to assign to the variable if it already
// exists (based on the number of arguments).
RUNTIME_ASSERT(args.length() == 1 || args.length() == 2);
bool assign = args.length() == 2;
CONVERT_ARG_CHECKED(String, name, 0);
GlobalObject* global = Top::context()->global();
// According to ECMA-262, section 12.2, page 62, the property must
// not be deletable.
PropertyAttributes attributes = DONT_DELETE;
// Lookup the property locally in the global object. If it isn't
// there, there is a property with this name in the prototype chain.
// We follow Safari and Firefox behavior and only set the property
// locally if there is an explicit initialization value that we have
// to assign to the property. When adding the property we take
// special precautions to always add it as a local property even in
// case of callbacks in the prototype chain (this rules out using
// SetProperty). We have IgnoreAttributesAndSetLocalProperty for
// this.
// Note that objects can have hidden prototypes, so we need to traverse
// the whole chain of hidden prototypes to do a 'local' lookup.
JSObject* real_holder = global;
LookupResult lookup;
while (true) {
real_holder->LocalLookup(*name, &lookup);
if (lookup.IsProperty()) {
// Determine if this is a redeclaration of something read-only.
if (lookup.IsReadOnly()) {
// If we found readonly property on one of hidden prototypes,
// just shadow it.
if (real_holder != Top::context()->global()) break;
return ThrowRedeclarationError("const", name);
}
// Determine if this is a redeclaration of an intercepted read-only
// property and figure out if the property exists at all.
bool found = true;
PropertyType type = lookup.type();
if (type == INTERCEPTOR) {
HandleScope handle_scope;
Handle<JSObject> holder(real_holder);
PropertyAttributes intercepted = holder->GetPropertyAttribute(*name);
real_holder = *holder;
if (intercepted == ABSENT) {
// The interceptor claims the property isn't there. We need to
// make sure to introduce it.
found = false;
} else if ((intercepted & READ_ONLY) != 0) {
// The property is present, but read-only. Since we're trying to
// overwrite it with a variable declaration we must throw a
// re-declaration error. However if we found readonly property
// on one of hidden prototypes, just shadow it.
if (real_holder != Top::context()->global()) break;
return ThrowRedeclarationError("const", name);
}
}
if (found && !assign) {
// The global property is there and we're not assigning any value
// to it. Just return.
return Heap::undefined_value();
}
// Assign the value (or undefined) to the property.
Object* value = (assign) ? args[1] : Heap::undefined_value();
return real_holder->SetProperty(&lookup, *name, value, attributes);
}
Object* proto = real_holder->GetPrototype();
if (!proto->IsJSObject())
break;
if (!JSObject::cast(proto)->map()->is_hidden_prototype())
break;
real_holder = JSObject::cast(proto);
}
global = Top::context()->global();
if (assign) {
return global->IgnoreAttributesAndSetLocalProperty(*name,
args[1],
attributes);