factory.cc.svn-base

Google浏览器V8内核代码

// Copyright 2006-2008 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 "v8.h"

#include "api.h"
#include "debug.h"
#include "execution.h"
#include "factory.h"
#include "macro-assembler.h"

namespace v8 { namespace internal {


Handle<FixedArray> Factory::NewFixedArray(int size, PretenureFlag pretenure) {
  ASSERT(0 <= size);
  CALL_HEAP_FUNCTION(Heap::AllocateFixedArray(size, pretenure), FixedArray);
}


Handle<DescriptorArray> Factory::NewDescriptorArray(int number_of_descriptors) {
  ASSERT(0 <= number_of_descriptors);
  CALL_HEAP_FUNCTION(DescriptorArray::Allocate(number_of_descriptors),
                     DescriptorArray);
}


// Symbols are created in the old generation (data space).
Handle<String> Factory::LookupSymbol(Vector<const char> string) {
  CALL_HEAP_FUNCTION(Heap::LookupSymbol(string), String);
}


Handle<String> Factory::NewStringFromAscii(Vector<const char> string,
                                           PretenureFlag pretenure) {
  CALL_HEAP_FUNCTION(Heap::AllocateStringFromAscii(string, pretenure), String);
}

Handle<String> Factory::NewStringFromUtf8(Vector<const char> string,
                                          PretenureFlag pretenure) {
  CALL_HEAP_FUNCTION(Heap::AllocateStringFromUtf8(string, pretenure), String);
}


Handle<String> Factory::NewStringFromTwoByte(Vector<const uc16> string) {
  CALL_HEAP_FUNCTION(Heap::AllocateStringFromTwoByte(string), String);
}


Handle<String> Factory::NewRawTwoByteString(int length,
                                            PretenureFlag pretenure) {
  CALL_HEAP_FUNCTION(Heap::AllocateRawTwoByteString(length, pretenure), String);
}


Handle<String> Factory::NewConsString(Handle<String> first,
                                      Handle<String> second) {
  CALL_HEAP_FUNCTION(Heap::AllocateConsString(*first, *second), String);
}


Handle<String> Factory::NewStringSlice(Handle<String> str, int begin, int end) {
  CALL_HEAP_FUNCTION(str->Slice(begin, end), String);
}


Handle<String> Factory::NewExternalStringFromAscii(
    ExternalAsciiString::Resource* resource) {
  CALL_HEAP_FUNCTION(Heap::AllocateExternalStringFromAscii(resource), String);
}


Handle<String> Factory::NewExternalStringFromTwoByte(
    ExternalTwoByteString::Resource* resource) {
  CALL_HEAP_FUNCTION(Heap::AllocateExternalStringFromTwoByte(resource), String);
}


Handle<Context> Factory::NewGlobalContext() {
  CALL_HEAP_FUNCTION(Heap::AllocateGlobalContext(), Context);
}


Handle<Context> Factory::NewFunctionContext(int length,
                                            Handle<JSFunction> closure) {
  CALL_HEAP_FUNCTION(Heap::AllocateFunctionContext(length, *closure), Context);
}


Handle<Context> Factory::NewWithContext(Handle<Context> previous,
                                        Handle<JSObject> extension) {
  CALL_HEAP_FUNCTION(Heap::AllocateWithContext(*previous, *extension), Context);
}


Handle<Struct> Factory::NewStruct(InstanceType type) {
  CALL_HEAP_FUNCTION(Heap::AllocateStruct(type), Struct);
}


Handle<AccessorInfo> Factory::NewAccessorInfo() {
  Handle<AccessorInfo> info =
      Handle<AccessorInfo>::cast(NewStruct(ACCESSOR_INFO_TYPE));
  info->set_flag(0);  // Must clear the flag, it was initialized as undefined.
  return info;
}


Handle<Script> Factory::NewScript(Handle<String> source) {
  Handle<Script> script = Handle<Script>::cast(NewStruct(SCRIPT_TYPE));
  script->set_source(*source);
  script->set_name(Heap::undefined_value());
  script->set_line_offset(Smi::FromInt(0));
  script->set_column_offset(Smi::FromInt(0));
  script->set_wrapper(*Factory::NewProxy(0, TENURED));
  script->set_type(Smi::FromInt(SCRIPT_TYPE_NORMAL));
  return script;
}


Handle<Proxy> Factory::NewProxy(Address addr, PretenureFlag pretenure) {
  CALL_HEAP_FUNCTION(Heap::AllocateProxy(addr, pretenure), Proxy);
}


Handle<Proxy> Factory::NewProxy(const AccessorDescriptor* desc) {
  return NewProxy((Address) desc, TENURED);
}


Handle<ByteArray> Factory::NewByteArray(int length) {
  ASSERT(0 <= length);
  CALL_HEAP_FUNCTION(Heap::AllocateByteArray(length), ByteArray);
}


Handle<Map> Factory::NewMap(InstanceType type, int instance_size) {
  CALL_HEAP_FUNCTION(Heap::AllocateMap(type, instance_size), Map);
}


Handle<JSObject> Factory::NewFunctionPrototype(Handle<JSFunction> function) {
  CALL_HEAP_FUNCTION(Heap::AllocateFunctionPrototype(*function), JSObject);
}


Handle<Map> Factory::CopyMap(Handle<Map> src) {
  CALL_HEAP_FUNCTION(src->Copy(), Map);
}


Handle<Map> Factory::CopyMapDropTransitions(Handle<Map> src) {
  CALL_HEAP_FUNCTION(src->CopyDropTransitions(), Map);
}


Handle<FixedArray> Factory::CopyFixedArray(Handle<FixedArray> array) {
  CALL_HEAP_FUNCTION(array->Copy(), FixedArray);
}


Handle<JSFunction> Factory::BaseNewFunctionFromBoilerplate(
    Handle<JSFunction> boilerplate,
    Handle<Map> function_map) {
  ASSERT(boilerplate->IsBoilerplate());
  ASSERT(!boilerplate->has_initial_map());
  ASSERT(!boilerplate->has_prototype());
  ASSERT(boilerplate->properties() == Heap::empty_fixed_array());
  ASSERT(boilerplate->elements() == Heap::empty_fixed_array());
  CALL_HEAP_FUNCTION(Heap::AllocateFunction(*function_map,
                                            boilerplate->shared(),
                                            Heap::the_hole_value()),
                     JSFunction);
}


Handle<JSFunction> Factory::NewFunctionFromBoilerplate(
    Handle<JSFunction> boilerplate,
    Handle<Context> context) {
  Handle<JSFunction> result =
      BaseNewFunctionFromBoilerplate(boilerplate, Top::function_map());
  result->set_context(*context);
  int number_of_literals = boilerplate->NumberOfLiterals();
  Handle<FixedArray> literals =
      Factory::NewFixedArray(number_of_literals, TENURED);
  if (number_of_literals > 0) {
    // Store the object, regexp and array functions in the literals
    // array prefix.  These functions will be used when creating
    // object, regexp and array literals in this function.
    literals->set(JSFunction::kLiteralGlobalContextIndex,
                  context->global_context());
  }
  result->set_literals(*literals);
  ASSERT(!result->IsBoilerplate());
  return result;
}


Handle<Object> Factory::NewNumber(double value,
                                  PretenureFlag pretenure) {
  CALL_HEAP_FUNCTION(Heap::NumberFromDouble(value, pretenure), Object);
}


Handle<Object> Factory::NewNumberFromInt(int value) {
  CALL_HEAP_FUNCTION(Heap::NumberFromInt32(value), Object);
}


Handle<JSObject> Factory::NewNeanderObject() {
  CALL_HEAP_FUNCTION(Heap::AllocateJSObjectFromMap(Heap::neander_map()),
                     JSObject);
}


Handle<Object> Factory::NewTypeError(const char* type,
                                     Vector< Handle<Object> > args) {
  return NewError("MakeTypeError", type, args);
}


Handle<Object> Factory::NewTypeError(Handle<String> message) {
  return NewError("$TypeError", message);
}


Handle<Object> Factory::NewRangeError(const char* type,
                                      Vector< Handle<Object> > args) {
  return NewError("MakeRangeError", type, args);
}


Handle<Object> Factory::NewRangeError(Handle<String> message) {
  return NewError("$RangeError", message);
}


Handle<Object> Factory::NewSyntaxError(const char* type, Handle<JSArray> args) {
  return NewError("MakeSyntaxError", type, args);
}


Handle<Object> Factory::NewSyntaxError(Handle<String> message) {
  return NewError("$SyntaxError", message);
}


Handle<Object> Factory::NewReferenceError(const char* type,
                                          Vector< Handle<Object> > args) {
  return NewError("MakeReferenceError", type, args);
}


Handle<Object> Factory::NewReferenceError(Handle<String> message) {
  return NewError("$ReferenceError", message);
}


Handle<Object> Factory::NewError(const char* maker, const char* type,
    Vector< Handle<Object> > args) {
  HandleScope scope;
  Handle<JSArray> array = NewJSArray(args.length());
  for (int i = 0; i < args.length(); i++)
    SetElement(array, i, args[i]);
  Handle<Object> result = NewError(maker, type, array);
  return result.EscapeFrom(&scope);
}


Handle<Object> Factory::NewEvalError(const char* type,
                                     Vector< Handle<Object> > args) {
  return NewError("MakeEvalError", type, args);
}


Handle<Object> Factory::NewError(const char* type,
                                 Vector< Handle<Object> > args) {
  return NewError("MakeError", type, args);
}


Handle<Object> Factory::NewError(const char* maker,
                                 const char* type,
                                 Handle<JSArray> args) {
  Handle<String> make_str = Factory::LookupAsciiSymbol(maker);
  Handle<JSFunction> fun =
      Handle<JSFunction>(
          JSFunction::cast(
              Top::security_context_builtins()->GetProperty(*make_str)));
  Handle<Object> type_obj = Factory::LookupAsciiSymbol(type);
  Object** argv[2] = { type_obj.location(),
                       Handle<Object>::cast(args).location() };

  // Invoke the JavaScript factory method. If an exception is thrown while
  // running the factory method, use the exception as the result.
  bool caught_exception;
  Handle<Object> result = Execution::TryCall(fun,
                                             Top::security_context_builtins(),
                                             2,
                                             argv,
                                             &caught_exception);
  return result;
}


Handle<Object> Factory::NewError(Handle<String> message) {
  return NewError("$Error", message);
}


Handle<Object> Factory::NewError(const char* constructor,
                                 Handle<String> message) {
  Handle<String> constr = Factory::LookupAsciiSymbol(constructor);
  Handle<JSFunction> fun =
      Handle<JSFunction>(
          JSFunction::cast(
              Top::security_context_builtins()->GetProperty(*constr)));
  Object** argv[1] = { Handle<Object>::cast(message).location() };

  // Invoke the JavaScript factory method. If an exception is thrown while
  // running the factory method, use the exception as the result.
  bool caught_exception;
  Handle<Object> result = Execution::TryCall(fun,
                                             Top::security_context_builtins(),
                                             1,
                                             argv,
                                             &caught_exception);
  return result;
}


Handle<JSFunction> Factory::NewFunction(Handle<String> name,
                                        InstanceType type,
                                        int instance_size,
                                        Handle<Code> code,
                                        bool force_initial_map) {
  // Allocate the function
  Handle<JSFunction> function = NewFunction(name, the_hole_value());
  function->set_code(*code);

  if (force_initial_map ||
      type != JS_OBJECT_TYPE ||
      instance_size != JSObject::kHeaderSize) {
    Handle<Map> initial_map = NewMap(type, instance_size);
    Handle<JSObject> prototype = NewFunctionPrototype(function);
    initial_map->set_prototype(*prototype);
    function->set_initial_map(*initial_map);
    initial_map->set_constructor(*function);
  } else {
    ASSERT(!function->has_initial_map());
    ASSERT(!function->has_prototype());
  }

  return function;
}


Handle<JSFunction> Factory::NewFunctionBoilerplate(Handle<String> name,
                                                   int number_of_literals,
                                                   bool contains_array_literal,
                                                   Handle<Code> code) {
  Handle<JSFunction> function = NewFunctionBoilerplate(name);
  function->set_code(*code);
  int literals_array_size = number_of_literals;
  // If the function contains object, regexp or array literals,
  // allocate extra space for a literals array prefix containing the
  // object, regexp and array constructor functions.
  if (number_of_literals > 0 || contains_array_literal) {
    literals_array_size += JSFunction::kLiteralsPrefixSize;
  }
  Handle<FixedArray> literals =
      Factory::NewFixedArray(literals_array_size, TENURED);
  function->set_literals(*literals);
  ASSERT(!function->has_initial_map());
  ASSERT(!function->has_prototype());
  return function;
}


Handle<JSFunction> Factory::NewFunctionBoilerplate(Handle<String> name) {
  Handle<SharedFunctionInfo> shared = NewSharedFunctionInfo(name);
  CALL_HEAP_FUNCTION(Heap::AllocateFunction(Heap::boilerplate_function_map(),