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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "PoolAlloc.h"
#ifndef _MSC_VER
#include <stdint.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include "InitializeGlobals.h"
#include "osinclude.h"
OS_TLSIndex PoolIndex = OS_INVALID_TLS_INDEX;
bool InitializePoolIndex()
{
assert(PoolIndex == OS_INVALID_TLS_INDEX);
PoolIndex = OS_AllocTLSIndex();
return PoolIndex != OS_INVALID_TLS_INDEX;
}
void FreePoolIndex()
{
assert(PoolIndex != OS_INVALID_TLS_INDEX);
OS_FreeTLSIndex(PoolIndex);
PoolIndex = OS_INVALID_TLS_INDEX;
}
TPoolAllocator* GetGlobalPoolAllocator()
{
assert(PoolIndex != OS_INVALID_TLS_INDEX);
return static_cast<TPoolAllocator*>(OS_GetTLSValue(PoolIndex));
}
void SetGlobalPoolAllocator(TPoolAllocator* poolAllocator)
{
assert(PoolIndex != OS_INVALID_TLS_INDEX);
OS_SetTLSValue(PoolIndex, poolAllocator);
}
//
// Implement the functionality of the TPoolAllocator class, which
// is documented in PoolAlloc.h.
//
TPoolAllocator::TPoolAllocator(int growthIncrement, int allocationAlignment) :
alignment(allocationAlignment)
#if !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
, pageSize(growthIncrement),
freeList(0),
inUseList(0),
numCalls(0),
totalBytes(0)
#endif
{
//
// 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;
#if !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
//
// 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;
//
// Align header skip
//
headerSkip = minAlign;
if (headerSkip < sizeof(tHeader)) {
headerSkip = (sizeof(tHeader) + alignmentMask) & ~alignmentMask;
}
#else // !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
mStack.push_back({});
#endif
}
TPoolAllocator::~TPoolAllocator()
{
#if !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
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;
}
#else // !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
for (auto& allocs : mStack) {
for (auto alloc : allocs) {
free(alloc);
}
}
mStack.clear();
#endif
}
// 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
{
#ifdef GUARD_BLOCKS
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.
#if defined(_MSC_VER)
_snprintf(assertMsg, sizeof(assertMsg), "PoolAlloc: Damage %s %Iu byte allocation at 0x%p\n",
locText, size, data());
#else
snprintf(assertMsg, sizeof(assertMsg), "PoolAlloc: Damage %s %zu byte allocation at 0x%p\n",
locText, size, data());
#endif
assert(0 && "PoolAlloc: Damage in guard block");
}
}
#endif
}
void TPoolAllocator::push()
{
#if !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
tAllocState state = { currentPageOffset, inUseList };
mStack.push_back(state);
//
// Indicate there is no current page to allocate from.
//
currentPageOffset = pageSize;
#else // !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
mStack.push_back({});
#endif
}
//
// 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 (mStack.size() < 1)
return;
#if !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
tHeader* page = mStack.back().page;
currentPageOffset = mStack.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;
}
mStack.pop_back();
#else // !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
for (auto alloc : mStack.back()) {
free(alloc);
}
mStack.pop_back();
#endif
}
//
// Do a mass-deallocation of all the individual allocations
// that have occurred.
//
void TPoolAllocator::popAll()
{
while (mStack.size() > 0)
pop();
}
void* TPoolAllocator::allocate(size_t numBytes)
{
#if !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
//
// Just keep some interesting statistics.
//
++numCalls;
totalBytes += 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);
// Detect integer overflow.
if (allocationSize < numBytes)
return 0;
//
// Do the allocation, most likely case first, for efficiency.
// This step could be moved to be inline sometime.
//
if (allocationSize <= pageSize - currentPageOffset) {
//
// 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 > pageSize - headerSkip) {
//
// 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;
// Detect integer overflow.
if (numBytesToAlloc < allocationSize)
return 0;
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);
#else // !defined(SWIFTSHADER_TRANSLATOR_DISABLE_POOL_ALLOC)
void *alloc = malloc(numBytes + alignmentMask);
mStack.back().push_back(alloc);
intptr_t intAlloc = reinterpret_cast<intptr_t>(alloc);
intAlloc = (intAlloc + alignmentMask) & ~alignmentMask;
return reinterpret_cast<void *>(intAlloc);
#endif
}
//
// 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();
}