📄 heap.h.svn-base
字号:
// 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.#ifndef V8_HEAP_H_#define V8_HEAP_H_namespace v8 { namespace internal {// Defines all the roots in Heap.#define STRONG_ROOT_LIST(V) \ V(Map, meta_map) \ V(Map, heap_number_map) \ V(Map, short_string_map) \ V(Map, medium_string_map) \ V(Map, long_string_map) \ V(Map, short_ascii_string_map) \ V(Map, medium_ascii_string_map) \ V(Map, long_ascii_string_map) \ V(Map, short_symbol_map) \ V(Map, medium_symbol_map) \ V(Map, long_symbol_map) \ V(Map, short_ascii_symbol_map) \ V(Map, medium_ascii_symbol_map) \ V(Map, long_ascii_symbol_map) \ V(Map, short_cons_symbol_map) \ V(Map, medium_cons_symbol_map) \ V(Map, long_cons_symbol_map) \ V(Map, short_cons_ascii_symbol_map) \ V(Map, medium_cons_ascii_symbol_map) \ V(Map, long_cons_ascii_symbol_map) \ V(Map, short_sliced_symbol_map) \ V(Map, medium_sliced_symbol_map) \ V(Map, long_sliced_symbol_map) \ V(Map, short_sliced_ascii_symbol_map) \ V(Map, medium_sliced_ascii_symbol_map) \ V(Map, long_sliced_ascii_symbol_map) \ V(Map, short_external_symbol_map) \ V(Map, medium_external_symbol_map) \ V(Map, long_external_symbol_map) \ V(Map, short_external_ascii_symbol_map) \ V(Map, medium_external_ascii_symbol_map) \ V(Map, long_external_ascii_symbol_map) \ V(Map, short_cons_string_map) \ V(Map, medium_cons_string_map) \ V(Map, long_cons_string_map) \ V(Map, short_cons_ascii_string_map) \ V(Map, medium_cons_ascii_string_map) \ V(Map, long_cons_ascii_string_map) \ V(Map, short_sliced_string_map) \ V(Map, medium_sliced_string_map) \ V(Map, long_sliced_string_map) \ V(Map, short_sliced_ascii_string_map) \ V(Map, medium_sliced_ascii_string_map) \ V(Map, long_sliced_ascii_string_map) \ V(Map, short_external_string_map) \ V(Map, medium_external_string_map) \ V(Map, long_external_string_map) \ V(Map, short_external_ascii_string_map) \ V(Map, medium_external_ascii_string_map) \ V(Map, long_external_ascii_string_map) \ V(Map, undetectable_short_string_map) \ V(Map, undetectable_medium_string_map) \ V(Map, undetectable_long_string_map) \ V(Map, undetectable_short_ascii_string_map) \ V(Map, undetectable_medium_ascii_string_map) \ V(Map, undetectable_long_ascii_string_map) \ V(Map, byte_array_map) \ V(Map, fixed_array_map) \ V(Map, hash_table_map) \ V(Map, context_map) \ V(Map, global_context_map) \ V(Map, code_map) \ V(Map, oddball_map) \ V(Map, boilerplate_function_map) \ V(Map, shared_function_info_map) \ V(Map, proxy_map) \ V(Map, one_word_filler_map) \ V(Map, two_word_filler_map) \ V(Object, nan_value) \ V(Object, undefined_value) \ V(Object, minus_zero_value) \ V(Object, null_value) \ V(Object, true_value) \ V(Object, false_value) \ V(String, empty_string) \ V(FixedArray, empty_fixed_array) \ V(DescriptorArray, empty_descriptor_array) \ V(Object, the_hole_value) \ V(Map, neander_map) \ V(JSObject, message_listeners) \ V(Proxy, prototype_accessors) \ V(JSObject, debug_event_listeners) \ V(Dictionary, code_stubs) \ V(Dictionary, non_monomorphic_cache) \ V(Code, js_entry_code) \ V(Code, js_construct_entry_code) \ V(Code, c_entry_code) \ V(Code, c_entry_debug_break_code) \ V(FixedArray, number_string_cache) \ V(FixedArray, single_character_string_cache) \ V(FixedArray, natives_source_cache)#define ROOT_LIST(V) \ STRONG_ROOT_LIST(V) \ V(Object, symbol_table)#define SYMBOL_LIST(V) \ V(Array_symbol, "Array") \ V(Object_symbol, "Object") \ V(Proto_symbol, "__proto__") \ V(StringImpl_symbol, "StringImpl") \ V(arguments_symbol, "arguments") \ V(arguments_shadow_symbol, ".arguments") \ V(call_symbol, "call") \ V(apply_symbol, "apply") \ V(caller_symbol, "caller") \ V(boolean_symbol, "boolean") \ V(callee_symbol, "callee") \ V(constructor_symbol, "constructor") \ V(code_symbol, ".code") \ V(result_symbol, ".result") \ V(catch_var_symbol, ".catch-var") \ V(finally_state_symbol, ".finally-state") \ V(empty_symbol, "") \ V(eval_symbol, "eval") \ V(function_symbol, "function") \ V(length_symbol, "length") \ V(name_symbol, "name") \ V(number_symbol, "number") \ V(object_symbol, "object") \ V(prototype_symbol, "prototype") \ V(string_symbol, "string") \ V(this_symbol, "this") \ V(to_string_symbol, "toString") \ V(char_at_symbol, "CharAt") \ V(undefined_symbol, "undefined") \ V(value_of_symbol, "valueOf") \ V(CreateObjectLiteralBoilerplate_symbol, "CreateObjectLiteralBoilerplate") \ V(CreateArrayLiteral_symbol, "CreateArrayLiteral") \ V(InitializeVarGlobal_symbol, "InitializeVarGlobal") \ V(InitializeConstGlobal_symbol, "InitializeConstGlobal") \ V(stack_overflow_symbol, "kStackOverflowBoilerplate") \ V(illegal_access_symbol, "illegal access") \ V(out_of_memory_symbol, "out-of-memory") \ V(illegal_execution_state_symbol, "illegal execution state") \ V(get_symbol, "get") \ V(set_symbol, "set") \ V(function_class_symbol, "Function") \ V(illegal_argument_symbol, "illegal argument") \ V(MakeReferenceError_symbol, "MakeReferenceError") \ V(MakeSyntaxError_symbol, "MakeSyntaxError") \ V(MakeTypeError_symbol, "MakeTypeError") \ V(invalid_lhs_in_assignment_symbol, "invalid_lhs_in_assignment") \ V(invalid_lhs_in_for_in_symbol, "invalid_lhs_in_for_in") \ V(invalid_lhs_in_postfix_op_symbol, "invalid_lhs_in_postfix_op") \ V(invalid_lhs_in_prefix_op_symbol, "invalid_lhs_in_prefix_op") \ V(illegal_return_symbol, "illegal_return") \ V(illegal_break_symbol, "illegal_break") \ V(illegal_continue_symbol, "illegal_continue") \ V(unknown_label_symbol, "unknown_label") \ V(redeclaration_symbol, "redeclaration") \ V(failure_symbol, "<failure>") \ V(space_symbol, " ") \ V(exec_symbol, "exec") \ V(zero_symbol, "0")// Forward declaration of the GCTracer class.class GCTracer;// The all static Heap captures the interface to the global object heap.// All JavaScript contexts by this process share the same object heap.class Heap : public AllStatic { public: // Configure heap size before setup. Return false if the heap has been // setup already. static bool ConfigureHeap(int semispace_size, int old_gen_size); static bool ConfigureHeapDefault(); // Initializes the global object heap. If create_heap_objects is true, // also creates the basic non-mutable objects. // Returns whether it succeeded. static bool Setup(bool create_heap_objects); // Destroys all memory allocated by the heap. static void TearDown(); // Returns whether Setup has been called. static bool HasBeenSetup(); // Returns the maximum heap capacity. static int MaxCapacity() { return young_generation_size_ + old_generation_size_; } static int SemiSpaceSize() { return semispace_size_; } static int InitialSemiSpaceSize() { return initial_semispace_size_; } static int YoungGenerationSize() { return young_generation_size_; } static int OldGenerationSize() { return old_generation_size_; } // Returns the capacity of the heap in bytes w/o growing. Heap grows when // more spaces are needed until it reaches the limit. static int Capacity(); // Returns the available bytes in space w/o growing. // Heap doesn't guarantee that it can allocate an object that requires // all available bytes. Check MaxHeapObjectSize() instead. static int Available(); // Returns the maximum object size that heap supports. Objects larger than // the maximum heap object size are allocated in a large object space. static inline int MaxHeapObjectSize(); // Returns of size of all objects residing in the heap. static int SizeOfObjects(); // Return the starting address and a mask for the new space. And-masking an // address with the mask will result in the start address of the new space // for all addresses in either semispace. static Address NewSpaceStart() { return new_space_->start(); } static uint32_t NewSpaceMask() { return new_space_->mask(); } static Address NewSpaceTop() { return new_space_->top(); } static NewSpace* new_space() { return new_space_; } static OldSpace* old_pointer_space() { return old_pointer_space_; } static OldSpace* old_data_space() { return old_data_space_; } static OldSpace* code_space() { return code_space_; } static MapSpace* map_space() { return map_space_; } static LargeObjectSpace* lo_space() { return lo_space_; } static Address* NewSpaceAllocationTopAddress() { return new_space_->allocation_top_address(); } static Address* NewSpaceAllocationLimitAddress() { return new_space_->allocation_limit_address(); } // Allocates and initializes a new JavaScript object based on a // constructor. // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation // failed. // Please note this does not perform a garbage collection. static Object* AllocateJSObject(JSFunction* constructor, PretenureFlag pretenure = NOT_TENURED); // Allocates the function prototype. // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation // failed. // Please note this does not perform a garbage collection. static Object* AllocateFunctionPrototype(JSFunction* function); // Reinitialize a JSGlobalObject based on a constructor. The JSObject // must have the same size as objects allocated using the // constructor. The JSObject is reinitialized and behaves as an // object that has been freshly allocated using the constructor. static Object* ReinitializeJSGlobalObject(JSFunction* constructor, JSGlobalObject* global); // Allocates and initializes a new JavaScript object based on a map. // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation // failed. // Please note this does not perform a garbage collection. static Object* AllocateJSObjectFromMap(Map* map, PretenureFlag pretenure = NOT_TENURED); // Allocates a heap object based on the map. // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation // failed.⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -