Source/ThirdParty/ANGLE/src/compiler/PoolAlloc.cpp - platform/external/webkit - Git at Google

 //
 // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //

 #include "compiler/PoolAlloc.h"

 #ifndef _MSC_VER
 #include <stdint.h>
 #endif
 #include <stdio.h>

 #include "compiler/InitializeGlobals.h"
 #include "compiler/osinclude.h"

 OS_TLSIndex PoolIndex = OS_INVALID_TLS_INDEX;

 void InitializeGlobalPools()
 {
     TThreadGlobalPools* globalPools= static_cast<TThreadGlobalPools*>(OS_GetTLSValue(PoolIndex));
     if (globalPools)
         return;

     TThreadGlobalPools* threadData = new TThreadGlobalPools();
     threadData->globalPoolAllocator = 0;

     OS_SetTLSValue(PoolIndex, threadData);
 }

 void FreeGlobalPools()
 {
     // Release the allocated memory for this thread.
     TThreadGlobalPools* globalPools= static_cast<TThreadGlobalPools*>(OS_GetTLSValue(PoolIndex));
     if (!globalPools)
         return;

     delete globalPools;
 }

 bool InitializePoolIndex()
 {
     // Allocate a TLS index.
     if ((PoolIndex = OS_AllocTLSIndex()) == OS_INVALID_TLS_INDEX)
         return false;

     return true;
 }

 void FreePoolIndex()
 {
     // Release the TLS index.
     OS_FreeTLSIndex(PoolIndex);
 }

 TPoolAllocator& GetGlobalPoolAllocator()
 {
     TThreadGlobalPools* threadData = static_cast<TThreadGlobalPools*>(OS_GetTLSValue(PoolIndex));

     return *threadData->globalPoolAllocator;
 }

 void SetGlobalPoolAllocator(TPoolAllocator* poolAllocator)
 {
     TThreadGlobalPools* threadData = static_cast<TThreadGlobalPools*>(OS_GetTLSValue(PoolIndex));

     threadData->globalPoolAllocator = poolAllocator;
 }

 //
 // Implement the functionality of the TPoolAllocator class, which
 // is documented in PoolAlloc.h.
 //
 TPoolAllocator::TPoolAllocator(int growthIncrement, int allocationAlignment) :
     pageSize(growthIncrement),
     alignment(allocationAlignment),
     freeList(0),
     inUseList(0),
     numCalls(0),
     totalBytes(0)
 {
     //
     // Don't allow page sizes we know are smaller than all common
     // OS page sizes.
     //
     if (pageSize < 4*1024)
         pageSize = 4*1024;

     //
     // A large currentPageOffset indicates a new page needs to
     // be obtained to allocate memory.
     //
     currentPageOffset = pageSize;

     //
     // Adjust alignment to be at least pointer aligned and
     // power of 2.
     //
     size_t minAlign = sizeof(void*);
     alignment &= ~(minAlign - 1);
     if (alignment < minAlign)
         alignment = minAlign;
     size_t a = 1;
     while (a < alignment)
         a <<= 1;
     alignment = a;
     alignmentMask = a - 1;

     //
     // Align header skip
     //
     headerSkip = minAlign;
     if (headerSkip < sizeof(tHeader)) {
         headerSkip = (sizeof(tHeader) + alignmentMask) & ~alignmentMask;
     }
 }

 TPoolAllocator::~TPoolAllocator()
 {
     while (inUseList) {
         tHeader* next = inUseList->nextPage;
         inUseList->~tHeader();
         delete [] reinterpret_cast<char*>(inUseList);
         inUseList = next;
     }

     // We should not check the guard blocks
     // here, because we did it already when the block was
     // placed into the free list.
     //
     while (freeList) {
         tHeader* next = freeList->nextPage;
         delete [] reinterpret_cast<char*>(freeList);
         freeList = next;
     }
 }

 // Support MSVC++ 6.0
 const unsigned char TAllocation::guardBlockBeginVal = 0xfb;
 const unsigned char TAllocation::guardBlockEndVal   = 0xfe;
 const unsigned char TAllocation::userDataFill       = 0xcd;

 #ifdef GUARD_BLOCKS
     const size_t TAllocation::guardBlockSize = 16;
 #else
     const size_t TAllocation::guardBlockSize = 0;
 #endif

 //
 // Check a single guard block for damage
 //
 void TAllocation::checkGuardBlock(unsigned char* blockMem, unsigned char val, const char* locText) const
 {
     for (size_t x = 0; x < guardBlockSize; x++) {
         if (blockMem[x] != val) {
             char assertMsg[80];

             // We don't print the assert message.  It's here just to be helpful.
             sprintf(assertMsg, "PoolAlloc: Damage %s %u byte allocation at 0x%p\n",
                     locText, size, data());
             assert(0 && "PoolAlloc: Damage in guard block");
         }
     }
 }


 void TPoolAllocator::push()
 {
     tAllocState state = { currentPageOffset, inUseList };

     stack.push_back(state);

     //
     // Indicate there is no current page to allocate from.
     //
     currentPageOffset = pageSize;
 }

 //
 // Do a mass-deallocation of all the individual allocations
 // that have occurred since the last push(), or since the
 // last pop(), or since the object's creation.
 //
 // The deallocated pages are saved for future allocations.
 //
 void TPoolAllocator::pop()
 {
     if (stack.size() < 1)
         return;

     tHeader* page = stack.back().page;
     currentPageOffset = stack.back().offset;

     while (inUseList != page) {
         // invoke destructor to free allocation list
         inUseList->~tHeader();

         tHeader* nextInUse = inUseList->nextPage;
         if (inUseList->pageCount > 1)
             delete [] reinterpret_cast<char*>(inUseList);
         else {
             inUseList->nextPage = freeList;
             freeList = inUseList;
         }
         inUseList = nextInUse;
     }

     stack.pop_back();
 }

 //
 // Do a mass-deallocation of all the individual allocations
 // that have occurred.
 //
 void TPoolAllocator::popAll()
 {
     while (stack.size() > 0)
         pop();
 }

 void* TPoolAllocator::allocate(size_t numBytes)
 {
     // If we are using guard blocks, all allocations are bracketed by
     // them: [guardblock][allocation][guardblock].  numBytes is how
     // much memory the caller asked for.  allocationSize is the total
     // size including guard blocks.  In release build,
     // guardBlockSize=0 and this all gets optimized away.
     size_t allocationSize = TAllocation::allocationSize(numBytes);

     //
     // Just keep some interesting statistics.
     //
     ++numCalls;
     totalBytes += numBytes;

     //
     // Do the allocation, most likely case first, for efficiency.
     // This step could be moved to be inline sometime.
     //
     if (currentPageOffset + allocationSize <= pageSize) {
         //
         // Safe to allocate from currentPageOffset.
         //
         unsigned char* memory = reinterpret_cast<unsigned char *>(inUseList) + currentPageOffset;
         currentPageOffset += allocationSize;
         currentPageOffset = (currentPageOffset + alignmentMask) & ~alignmentMask;

         return initializeAllocation(inUseList, memory, numBytes);
     }

     if (allocationSize + headerSkip > pageSize) {
         //
         // Do a multi-page allocation.  Don't mix these with the others.
         // The OS is efficient and allocating and free-ing multiple pages.
         //
         size_t numBytesToAlloc = allocationSize + headerSkip;
         tHeader* memory = reinterpret_cast<tHeader*>(::new char[numBytesToAlloc]);
         if (memory == 0)
             return 0;

         // Use placement-new to initialize header
         new(memory) tHeader(inUseList, (numBytesToAlloc + pageSize - 1) / pageSize);
         inUseList = memory;

         currentPageOffset = pageSize;  // make next allocation come from a new page

         // No guard blocks for multi-page allocations (yet)
         return reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(memory) + headerSkip);
     }

     //
     // Need a simple page to allocate from.
     //
     tHeader* memory;
     if (freeList) {
         memory = freeList;
         freeList = freeList->nextPage;
     } else {
         memory = reinterpret_cast<tHeader*>(::new char[pageSize]);
         if (memory == 0)
             return 0;
     }

     // Use placement-new to initialize header
     new(memory) tHeader(inUseList, 1);
     inUseList = memory;

     unsigned char* ret = reinterpret_cast<unsigned char *>(inUseList) + headerSkip;
     currentPageOffset = (headerSkip + allocationSize + alignmentMask) & ~alignmentMask;

     return initializeAllocation(inUseList, ret, numBytes);
 }


 //
 // Check all allocations in a list for damage by calling check on each.
 //
 void TAllocation::checkAllocList() const
 {
     for (const TAllocation* alloc = this; alloc != 0; alloc = alloc->prevAlloc)
         alloc->check();
 }
	//
	// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.
	//

	#include "compiler/PoolAlloc.h"

	#ifndef _MSC_VER
	#include <stdint.h>
	#endif
	#include <stdio.h>

	#include "compiler/InitializeGlobals.h"
	#include "compiler/osinclude.h"

	OS_TLSIndex PoolIndex = OS_INVALID_TLS_INDEX;

	void InitializeGlobalPools()
	{
	TThreadGlobalPools* globalPools= static_cast<TThreadGlobalPools*>(OS_GetTLSValue(PoolIndex));
	if (globalPools)
	return;

	TThreadGlobalPools* threadData = new TThreadGlobalPools();
	threadData->globalPoolAllocator = 0;

	OS_SetTLSValue(PoolIndex, threadData);
	}

	void FreeGlobalPools()
	{
	// Release the allocated memory for this thread.
	TThreadGlobalPools* globalPools= static_cast<TThreadGlobalPools*>(OS_GetTLSValue(PoolIndex));
	if (!globalPools)
	return;

	delete globalPools;
	}

	bool InitializePoolIndex()
	{
	// Allocate a TLS index.
	if ((PoolIndex = OS_AllocTLSIndex()) == OS_INVALID_TLS_INDEX)
	return false;

	return true;
	}

	void FreePoolIndex()
	{
	// Release the TLS index.
	OS_FreeTLSIndex(PoolIndex);
	}

	TPoolAllocator& GetGlobalPoolAllocator()
	{
	TThreadGlobalPools* threadData = static_cast<TThreadGlobalPools*>(OS_GetTLSValue(PoolIndex));

	return *threadData->globalPoolAllocator;
	}

	void SetGlobalPoolAllocator(TPoolAllocator* poolAllocator)
	{
	TThreadGlobalPools* threadData = static_cast<TThreadGlobalPools*>(OS_GetTLSValue(PoolIndex));

	threadData->globalPoolAllocator = poolAllocator;
	}

	//
	// Implement the functionality of the TPoolAllocator class, which
	// is documented in PoolAlloc.h.
	//
	TPoolAllocator::TPoolAllocator(int growthIncrement, int allocationAlignment) :
	pageSize(growthIncrement),
	alignment(allocationAlignment),
	freeList(0),
	inUseList(0),
	numCalls(0),
	totalBytes(0)
	{
	//
	// Don't allow page sizes we know are smaller than all common
	// OS page sizes.
	//
	if (pageSize < 4*1024)
	pageSize = 4*1024;

	//
	// A large currentPageOffset indicates a new page needs to
	// be obtained to allocate memory.
	//
	currentPageOffset = pageSize;

	//
	// Adjust alignment to be at least pointer aligned and
	// power of 2.
	//
	size_t minAlign = sizeof(void*);
	alignment &= ~(minAlign - 1);
	if (alignment < minAlign)
	alignment = minAlign;
	size_t a = 1;
	while (a < alignment)
	a <<= 1;
	alignment = a;
	alignmentMask = a - 1;

	//
	// Align header skip
	//
	headerSkip = minAlign;
	if (headerSkip < sizeof(tHeader)) {
	headerSkip = (sizeof(tHeader) + alignmentMask) & ~alignmentMask;
	}
	}

	TPoolAllocator::~TPoolAllocator()
	{
	while (inUseList) {
	tHeader* next = inUseList->nextPage;
	inUseList->~tHeader();
	delete [] reinterpret_cast<char*>(inUseList);
	inUseList = next;
	}

	// We should not check the guard blocks
	// here, because we did it already when the block was
	// placed into the free list.
	//
	while (freeList) {
	tHeader* next = freeList->nextPage;
	delete [] reinterpret_cast<char*>(freeList);
	freeList = next;
	}
	}

	// Support MSVC++ 6.0
	const unsigned char TAllocation::guardBlockBeginVal = 0xfb;
	const unsigned char TAllocation::guardBlockEndVal = 0xfe;
	const unsigned char TAllocation::userDataFill = 0xcd;

	#ifdef GUARD_BLOCKS
	const size_t TAllocation::guardBlockSize = 16;
	#else
	const size_t TAllocation::guardBlockSize = 0;
	#endif

	//
	// Check a single guard block for damage
	//
	void TAllocation::checkGuardBlock(unsigned char* blockMem, unsigned char val, const char* locText) const
	{
	for (size_t x = 0; x < guardBlockSize; x++) {
	if (blockMem[x] != val) {
	char assertMsg[80];

	// We don't print the assert message. It's here just to be helpful.
	sprintf(assertMsg, "PoolAlloc: Damage %s %u byte allocation at 0x%p\n",
	locText, size, data());
	assert(0 && "PoolAlloc: Damage in guard block");
	}
	}
	}


	void TPoolAllocator::push()
	{
	tAllocState state = { currentPageOffset, inUseList };

	stack.push_back(state);

	//
	// Indicate there is no current page to allocate from.
	//
	currentPageOffset = pageSize;
	}

	//
	// Do a mass-deallocation of all the individual allocations
	// that have occurred since the last push(), or since the
	// last pop(), or since the object's creation.
	//
	// The deallocated pages are saved for future allocations.
	//
	void TPoolAllocator::pop()
	{
	if (stack.size() < 1)
	return;

	tHeader* page = stack.back().page;
	currentPageOffset = stack.back().offset;

	while (inUseList != page) {
	// invoke destructor to free allocation list
	inUseList->~tHeader();

	tHeader* nextInUse = inUseList->nextPage;
	if (inUseList->pageCount > 1)
	delete [] reinterpret_cast<char*>(inUseList);
	else {
	inUseList->nextPage = freeList;
	freeList = inUseList;
	}
	inUseList = nextInUse;
	}

	stack.pop_back();
	}

	//
	// Do a mass-deallocation of all the individual allocations
	// that have occurred.
	//
	void TPoolAllocator::popAll()
	{
	while (stack.size() > 0)
	pop();
	}

	void* TPoolAllocator::allocate(size_t numBytes)
	{
	// If we are using guard blocks, all allocations are bracketed by
	// them: [guardblock][allocation][guardblock]. numBytes is how
	// much memory the caller asked for. allocationSize is the total
	// size including guard blocks. In release build,
	// guardBlockSize=0 and this all gets optimized away.
	size_t allocationSize = TAllocation::allocationSize(numBytes);

	//
	// Just keep some interesting statistics.
	//
	++numCalls;
	totalBytes += numBytes;

	//
	// Do the allocation, most likely case first, for efficiency.
	// This step could be moved to be inline sometime.
	//
	if (currentPageOffset + allocationSize <= pageSize) {
	//
	// Safe to allocate from currentPageOffset.
	//
	unsigned char* memory = reinterpret_cast<unsigned char *>(inUseList) + currentPageOffset;
	currentPageOffset += allocationSize;
	currentPageOffset = (currentPageOffset + alignmentMask) & ~alignmentMask;

	return initializeAllocation(inUseList, memory, numBytes);
	}

	if (allocationSize + headerSkip > pageSize) {
	//
	// Do a multi-page allocation. Don't mix these with the others.
	// The OS is efficient and allocating and free-ing multiple pages.
	//
	size_t numBytesToAlloc = allocationSize + headerSkip;
	tHeader* memory = reinterpret_cast<tHeader*>(::new char[numBytesToAlloc]);
	if (memory == 0)
	return 0;

	// Use placement-new to initialize header
	new(memory) tHeader(inUseList, (numBytesToAlloc + pageSize - 1) / pageSize);
	inUseList = memory;

	currentPageOffset = pageSize; // make next allocation come from a new page

	// No guard blocks for multi-page allocations (yet)
	return reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(memory) + headerSkip);
	}

	//
	// Need a simple page to allocate from.
	//
	tHeader* memory;
	if (freeList) {
	memory = freeList;
	freeList = freeList->nextPage;
	} else {
	memory = reinterpret_cast<tHeader*>(::new char[pageSize]);
	if (memory == 0)
	return 0;
	}

	// Use placement-new to initialize header
	new(memory) tHeader(inUseList, 1);
	inUseList = memory;

	unsigned char* ret = reinterpret_cast<unsigned char *>(inUseList) + headerSkip;
	currentPageOffset = (headerSkip + allocationSize + alignmentMask) & ~alignmentMask;

	return initializeAllocation(inUseList, ret, numBytes);
	}


	//
	// Check all allocations in a list for damage by calling check on each.
	//
	void TAllocation::checkAllocList() const
	{
	for (const TAllocation* alloc = this; alloc != 0; alloc = alloc->prevAlloc)
	alloc->check();
	}