v8/src/allocation.cc
lrn@chromium.org af7b6fecfe Split globals.h into two parts, where only one depends on V8.
Made allocation.{h,cc} independent of V8, allowing utils.h to allocate
vectors and collectors.

Review URL: http://codereview.chromium.org/5005001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5826 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2010-11-15 13:23:30 +00:00

205 lines
5.7 KiB
C++

// Copyright 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 <stdlib.h>
#include "../include/v8stdint.h"
#include "globals.h"
#include "checks.h"
#include "allocation.h"
#include "utils.h"
namespace v8 {
namespace internal {
void* Malloced::New(size_t size) {
ASSERT(NativeAllocationChecker::allocation_allowed());
void* result = malloc(size);
if (result == NULL) {
v8::internal::FatalProcessOutOfMemory("Malloced operator new");
}
return result;
}
void Malloced::Delete(void* p) {
free(p);
}
void Malloced::FatalProcessOutOfMemory() {
v8::internal::FatalProcessOutOfMemory("Out of memory");
}
#ifdef DEBUG
static void* invalid = static_cast<void*>(NULL);
void* Embedded::operator new(size_t size) {
UNREACHABLE();
return invalid;
}
void Embedded::operator delete(void* p) {
UNREACHABLE();
}
void* AllStatic::operator new(size_t size) {
UNREACHABLE();
return invalid;
}
void AllStatic::operator delete(void* p) {
UNREACHABLE();
}
#endif
char* StrDup(const char* str) {
int length = StrLength(str);
char* result = NewArray<char>(length + 1);
memcpy(result, str, length);
result[length] = '\0';
return result;
}
char* StrNDup(const char* str, int n) {
int length = StrLength(str);
if (n < length) length = n;
char* result = NewArray<char>(length + 1);
memcpy(result, str, length);
result[length] = '\0';
return result;
}
int NativeAllocationChecker::allocation_disallowed_ = 0;
PreallocatedStorage PreallocatedStorage::in_use_list_(0);
PreallocatedStorage PreallocatedStorage::free_list_(0);
bool PreallocatedStorage::preallocated_ = false;
void PreallocatedStorage::Init(size_t size) {
ASSERT(free_list_.next_ == &free_list_);
ASSERT(free_list_.previous_ == &free_list_);
PreallocatedStorage* free_chunk =
reinterpret_cast<PreallocatedStorage*>(new char[size]);
free_list_.next_ = free_list_.previous_ = free_chunk;
free_chunk->next_ = free_chunk->previous_ = &free_list_;
free_chunk->size_ = size - sizeof(PreallocatedStorage);
preallocated_ = true;
}
void* PreallocatedStorage::New(size_t size) {
if (!preallocated_) {
return FreeStoreAllocationPolicy::New(size);
}
ASSERT(free_list_.next_ != &free_list_);
ASSERT(free_list_.previous_ != &free_list_);
size = (size + kPointerSize - 1) & ~(kPointerSize - 1);
// Search for exact fit.
for (PreallocatedStorage* storage = free_list_.next_;
storage != &free_list_;
storage = storage->next_) {
if (storage->size_ == size) {
storage->Unlink();
storage->LinkTo(&in_use_list_);
return reinterpret_cast<void*>(storage + 1);
}
}
// Search for first fit.
for (PreallocatedStorage* storage = free_list_.next_;
storage != &free_list_;
storage = storage->next_) {
if (storage->size_ >= size + sizeof(PreallocatedStorage)) {
storage->Unlink();
storage->LinkTo(&in_use_list_);
PreallocatedStorage* left_over =
reinterpret_cast<PreallocatedStorage*>(
reinterpret_cast<char*>(storage + 1) + size);
left_over->size_ = storage->size_ - size - sizeof(PreallocatedStorage);
ASSERT(size + left_over->size_ + sizeof(PreallocatedStorage) ==
storage->size_);
storage->size_ = size;
left_over->LinkTo(&free_list_);
return reinterpret_cast<void*>(storage + 1);
}
}
// Allocation failure.
ASSERT(false);
return NULL;
}
// We don't attempt to coalesce.
void PreallocatedStorage::Delete(void* p) {
if (p == NULL) {
return;
}
if (!preallocated_) {
FreeStoreAllocationPolicy::Delete(p);
return;
}
PreallocatedStorage* storage = reinterpret_cast<PreallocatedStorage*>(p) - 1;
ASSERT(storage->next_->previous_ == storage);
ASSERT(storage->previous_->next_ == storage);
storage->Unlink();
storage->LinkTo(&free_list_);
}
void PreallocatedStorage::LinkTo(PreallocatedStorage* other) {
next_ = other->next_;
other->next_->previous_ = this;
previous_ = other;
other->next_ = this;
}
void PreallocatedStorage::Unlink() {
next_->previous_ = previous_;
previous_->next_ = next_;
}
PreallocatedStorage::PreallocatedStorage(size_t size)
: size_(size) {
previous_ = next_ = this;
}
} } // namespace v8::internal