30a0a7de43
This issue was raised by Brett Wilson while reviewing my changelist for readability. Craig Silverstein (one of C++ SG maintainers) confirmed that we should declare one namespace per line. Our way of namespaces closing seems not violating style guides (there is no clear agreement on it), so I left it intact. Review URL: http://codereview.chromium.org/115756 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2038 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
199 lines
5.6 KiB
C++
199 lines
5.6 KiB
C++
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <stdlib.h>
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#include "v8.h"
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namespace v8 {
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namespace internal {
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void* Malloced::New(size_t size) {
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ASSERT(NativeAllocationChecker::allocation_allowed());
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void* result = malloc(size);
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if (result == NULL) V8::FatalProcessOutOfMemory("Malloced operator new");
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return result;
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}
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void Malloced::Delete(void* p) {
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free(p);
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}
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void Malloced::FatalProcessOutOfMemory() {
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V8::FatalProcessOutOfMemory("Out of memory");
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}
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#ifdef DEBUG
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static void* invalid = static_cast<void*>(NULL);
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void* Embedded::operator new(size_t size) {
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UNREACHABLE();
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return invalid;
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}
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void Embedded::operator delete(void* p) {
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UNREACHABLE();
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}
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void* AllStatic::operator new(size_t size) {
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UNREACHABLE();
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return invalid;
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}
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void AllStatic::operator delete(void* p) {
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UNREACHABLE();
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}
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#endif
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char* StrDup(const char* str) {
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int length = strlen(str);
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char* result = NewArray<char>(length + 1);
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memcpy(result, str, length * kCharSize);
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result[length] = '\0';
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return result;
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}
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char* StrNDup(const char* str, size_t n) {
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size_t length = strlen(str);
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if (n < length) length = n;
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char* result = NewArray<char>(length + 1);
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memcpy(result, str, length * kCharSize);
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result[length] = '\0';
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return result;
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}
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int NativeAllocationChecker::allocation_disallowed_ = 0;
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PreallocatedStorage PreallocatedStorage::in_use_list_(0);
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PreallocatedStorage PreallocatedStorage::free_list_(0);
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bool PreallocatedStorage::preallocated_ = false;
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void PreallocatedStorage::Init(size_t size) {
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ASSERT(free_list_.next_ == &free_list_);
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ASSERT(free_list_.previous_ == &free_list_);
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PreallocatedStorage* free_chunk =
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reinterpret_cast<PreallocatedStorage*>(new char[size]);
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free_list_.next_ = free_list_.previous_ = free_chunk;
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free_chunk->next_ = free_chunk->previous_ = &free_list_;
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free_chunk->size_ = size - sizeof(PreallocatedStorage);
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preallocated_ = true;
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}
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void* PreallocatedStorage::New(size_t size) {
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if (!preallocated_) {
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return FreeStoreAllocationPolicy::New(size);
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}
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ASSERT(free_list_.next_ != &free_list_);
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ASSERT(free_list_.previous_ != &free_list_);
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size = (size + kPointerSize - 1) & ~(kPointerSize - 1);
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// Search for exact fit.
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for (PreallocatedStorage* storage = free_list_.next_;
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storage != &free_list_;
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storage = storage->next_) {
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if (storage->size_ == size) {
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storage->Unlink();
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storage->LinkTo(&in_use_list_);
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return reinterpret_cast<void*>(storage + 1);
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}
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}
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// Search for first fit.
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for (PreallocatedStorage* storage = free_list_.next_;
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storage != &free_list_;
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storage = storage->next_) {
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if (storage->size_ >= size + sizeof(PreallocatedStorage)) {
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storage->Unlink();
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storage->LinkTo(&in_use_list_);
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PreallocatedStorage* left_over =
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reinterpret_cast<PreallocatedStorage*>(
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reinterpret_cast<char*>(storage + 1) + size);
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left_over->size_ = storage->size_ - size - sizeof(PreallocatedStorage);
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ASSERT(size + left_over->size_ + sizeof(PreallocatedStorage) ==
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storage->size_);
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storage->size_ = size;
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left_over->LinkTo(&free_list_);
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return reinterpret_cast<void*>(storage + 1);
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}
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}
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// Allocation failure.
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ASSERT(false);
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return NULL;
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}
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// We don't attempt to coalesce.
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void PreallocatedStorage::Delete(void* p) {
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if (p == NULL) {
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return;
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}
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if (!preallocated_) {
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FreeStoreAllocationPolicy::Delete(p);
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return;
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}
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PreallocatedStorage* storage = reinterpret_cast<PreallocatedStorage*>(p) - 1;
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ASSERT(storage->next_->previous_ == storage);
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ASSERT(storage->previous_->next_ == storage);
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storage->Unlink();
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storage->LinkTo(&free_list_);
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}
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void PreallocatedStorage::LinkTo(PreallocatedStorage* other) {
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next_ = other->next_;
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other->next_->previous_ = this;
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previous_ = other;
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other->next_ = this;
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}
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void PreallocatedStorage::Unlink() {
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next_->previous_ = previous_;
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previous_->next_ = next_;
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}
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PreallocatedStorage::PreallocatedStorage(size_t size)
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: size_(size) {
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previous_ = next_ = this;
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}
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} } // namespace v8::internal
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