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authorDan Sinclair <dsinclair@chromium.org>2017-01-10 16:38:10 -0500
committerChromium commit bot <commit-bot@chromium.org>2017-01-10 21:53:32 +0000
commit0cb9b8cb094532ff868314350680d3fb0ca2fe51 (patch)
tree60e61f1e9547d5b99c010ee96b8c0ea7c0480e85 /xfa/fgas/crt/fgas_memory.cpp
parent1f5d4988dcdac125e3e822d37c9086a5e4a3e224 (diff)
downloadpdfium-0cb9b8cb094532ff868314350680d3fb0ca2fe51.tar.xz
Strip out custom allocator code
This Cl replaces the custom IFX_MemoryAllocator code with new/delete as needed. Change-Id: Ie786f607c9e0b3035ffd87733bc3e29a4b6426d9 Reviewed-on: https://pdfium-review.googlesource.com/2164 Commit-Queue: dsinclair <dsinclair@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
Diffstat (limited to 'xfa/fgas/crt/fgas_memory.cpp')
-rw-r--r--xfa/fgas/crt/fgas_memory.cpp254
1 files changed, 0 insertions, 254 deletions
diff --git a/xfa/fgas/crt/fgas_memory.cpp b/xfa/fgas/crt/fgas_memory.cpp
deleted file mode 100644
index 9625f95203..0000000000
--- a/xfa/fgas/crt/fgas_memory.cpp
+++ /dev/null
@@ -1,254 +0,0 @@
-// Copyright 2014 PDFium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
-
-#include "xfa/fgas/crt/fgas_memory.h"
-
-#ifndef MEMORY_TOOL_REPLACES_ALLOCATOR
-// Use CFX_DefStore to replace CFX_FixedStore to simplify memory
-// management so that some problems such Use-After-Free can be
-// detected by Asan or ClusterFuzz tools.
-#define MEMORY_TOOL_REPLACES_ALLOCATOR
-#endif
-
-#include <algorithm>
-
-namespace {
-
-struct FX_STATICSTORECHUNK {
- FX_STATICSTORECHUNK* pNextChunk;
- size_t iChunkSize;
- size_t iFreeSize;
-};
-
-class CFX_StaticStore : public IFX_MemoryAllocator, public CFX_Target {
- public:
- explicit CFX_StaticStore(size_t iDefChunkSize);
- ~CFX_StaticStore() override;
-
- void* Alloc(size_t size) override;
- void Free(void* pBlock) override {}
-
- private:
- size_t m_iAllocatedSize;
- size_t m_iDefChunkSize;
- FX_STATICSTORECHUNK* m_pChunk;
- FX_STATICSTORECHUNK* m_pLastChunk;
- FX_STATICSTORECHUNK* AllocChunk(size_t size);
- FX_STATICSTORECHUNK* FindChunk(size_t size);
-};
-
-#ifdef MEMORY_TOOL_REPLACES_ALLOCATOR
-
-class CFX_DefStore : public IFX_MemoryAllocator, public CFX_Target {
- public:
- CFX_DefStore() {}
- ~CFX_DefStore() override {}
-
- void* Alloc(size_t size) override { return FX_Alloc(uint8_t, size); }
- void Free(void* pBlock) override { FX_Free(pBlock); }
-};
-
-#else
-
-struct FX_FIXEDSTORECHUNK {
- uint8_t* FirstFlag() { return reinterpret_cast<uint8_t*>(this + 1); }
- uint8_t* FirstBlock() { return FirstFlag() + iChunkSize; }
-
- FX_FIXEDSTORECHUNK* pNextChunk;
- size_t iChunkSize;
- size_t iFreeNum;
-};
-
-class CFX_FixedStore : public IFX_MemoryAllocator, public CFX_Target {
- public:
- CFX_FixedStore(size_t iBlockSize, size_t iBlockNumsInChunk);
- ~CFX_FixedStore() override;
- void* Alloc(size_t size) override;
- void Free(void* pBlock) override;
-
- private:
- FX_FIXEDSTORECHUNK* AllocChunk();
-
- size_t m_iBlockSize;
- size_t m_iDefChunkSize;
- FX_FIXEDSTORECHUNK* m_pChunk;
-};
-
-#endif // MEMORY_TOOL_REPLACES_ALLOCATOR
-
-} // namespace
-
-#define FX_4BYTEALIGN(size) (((size) + 3) & ~3)
-
-std::unique_ptr<IFX_MemoryAllocator> IFX_MemoryAllocator::Create(
- FX_ALLOCTYPE eType,
- size_t chunkSize,
- size_t blockSize) {
- switch (eType) {
- case FX_ALLOCTYPE_Static:
- return std::unique_ptr<IFX_MemoryAllocator>(
- new CFX_StaticStore(chunkSize));
- case FX_ALLOCTYPE_Fixed:
-#ifdef MEMORY_TOOL_REPLACES_ALLOCATOR
- return std::unique_ptr<IFX_MemoryAllocator>(new CFX_DefStore());
-#else
- return std::unique_ptr<IFX_MemoryAllocator>(
- new CFX_FixedStore(blockSize, chunkSize));
-#endif // MEMORY_TOOL_REPLACES_ALLOCATOR
- default:
- ASSERT(0);
- return nullptr;
- }
-}
-
-CFX_StaticStore::CFX_StaticStore(size_t iDefChunkSize)
- : m_iAllocatedSize(0),
- m_iDefChunkSize(iDefChunkSize),
- m_pChunk(nullptr),
- m_pLastChunk(nullptr) {
- ASSERT(m_iDefChunkSize != 0);
-}
-
-CFX_StaticStore::~CFX_StaticStore() {
- FX_STATICSTORECHUNK* pChunk = m_pChunk;
- while (pChunk) {
- FX_STATICSTORECHUNK* pNext = pChunk->pNextChunk;
- FX_Free(pChunk);
- pChunk = pNext;
- }
-}
-
-FX_STATICSTORECHUNK* CFX_StaticStore::AllocChunk(size_t size) {
- ASSERT(size != 0);
- FX_STATICSTORECHUNK* pChunk = (FX_STATICSTORECHUNK*)FX_Alloc(
- uint8_t, sizeof(FX_STATICSTORECHUNK) + size);
- pChunk->iChunkSize = size;
- pChunk->iFreeSize = size;
- pChunk->pNextChunk = nullptr;
- if (!m_pLastChunk) {
- m_pChunk = pChunk;
- } else {
- m_pLastChunk->pNextChunk = pChunk;
- }
- m_pLastChunk = pChunk;
- return pChunk;
-}
-
-FX_STATICSTORECHUNK* CFX_StaticStore::FindChunk(size_t size) {
- ASSERT(size != 0);
- if (!m_pLastChunk || m_pLastChunk->iFreeSize < size) {
- return AllocChunk(std::max(m_iDefChunkSize, size));
- }
- return m_pLastChunk;
-}
-
-void* CFX_StaticStore::Alloc(size_t size) {
- size = FX_4BYTEALIGN(size);
- ASSERT(size != 0);
- FX_STATICSTORECHUNK* pChunk = FindChunk(size);
- ASSERT(pChunk->iFreeSize >= size);
- uint8_t* p = (uint8_t*)pChunk;
- p += sizeof(FX_STATICSTORECHUNK) + pChunk->iChunkSize - pChunk->iFreeSize;
- pChunk->iFreeSize -= size;
- m_iAllocatedSize += size;
- return p;
-}
-
-#ifndef MEMORY_TOOL_REPLACES_ALLOCATOR
-
-CFX_FixedStore::CFX_FixedStore(size_t iBlockSize, size_t iBlockNumsInChunk)
- : m_iBlockSize(FX_4BYTEALIGN(iBlockSize)),
- m_iDefChunkSize(FX_4BYTEALIGN(iBlockNumsInChunk)),
- m_pChunk(nullptr) {
- ASSERT(m_iBlockSize != 0 && m_iDefChunkSize != 0);
-}
-
-CFX_FixedStore::~CFX_FixedStore() {
- FX_FIXEDSTORECHUNK* pChunk = m_pChunk;
- while (pChunk) {
- FX_FIXEDSTORECHUNK* pNext = pChunk->pNextChunk;
- FX_Free(pChunk);
- pChunk = pNext;
- }
-}
-
-FX_FIXEDSTORECHUNK* CFX_FixedStore::AllocChunk() {
- int32_t iTotalSize = sizeof(FX_FIXEDSTORECHUNK) + m_iDefChunkSize +
- m_iBlockSize * m_iDefChunkSize;
- FX_FIXEDSTORECHUNK* pChunk =
- (FX_FIXEDSTORECHUNK*)FX_Alloc(uint8_t, iTotalSize);
- if (!pChunk)
- return nullptr;
-
- FXSYS_memset(pChunk->FirstFlag(), 0, m_iDefChunkSize);
- pChunk->pNextChunk = m_pChunk;
- pChunk->iChunkSize = m_iDefChunkSize;
- pChunk->iFreeNum = m_iDefChunkSize;
- m_pChunk = pChunk;
- return pChunk;
-}
-
-void* CFX_FixedStore::Alloc(size_t size) {
- if (size > m_iBlockSize) {
- return nullptr;
- }
- FX_FIXEDSTORECHUNK* pChunk = m_pChunk;
- while (pChunk) {
- if (pChunk->iFreeNum > 0) {
- break;
- }
- pChunk = pChunk->pNextChunk;
- }
- if (!pChunk) {
- pChunk = AllocChunk();
- }
- uint8_t* pFlags = pChunk->FirstFlag();
- size_t i = 0;
- for (; i < pChunk->iChunkSize; i++)
- if (pFlags[i] == 0) {
- break;
- }
- ASSERT(i < pChunk->iChunkSize);
- pFlags[i] = 1;
- pChunk->iFreeNum--;
- return pChunk->FirstBlock() + i * m_iBlockSize;
-}
-
-void CFX_FixedStore::Free(void* pBlock) {
- FX_FIXEDSTORECHUNK* pPrior = nullptr;
- FX_FIXEDSTORECHUNK* pChunk = m_pChunk;
- uint8_t* pStart = nullptr;
- uint8_t* pEnd;
- while (pChunk) {
- pStart = pChunk->FirstBlock();
- if (pBlock >= pStart) {
- pEnd = pStart + m_iBlockSize * pChunk->iChunkSize;
- if (pBlock < pEnd) {
- break;
- }
- }
- pPrior = pChunk, pChunk = pChunk->pNextChunk;
- }
- ASSERT(pChunk);
- size_t iPos = ((uint8_t*)pBlock - pStart) / m_iBlockSize;
- ASSERT(iPos < pChunk->iChunkSize);
- uint8_t* pFlags = pChunk->FirstFlag();
- if (pFlags[iPos] == 0) {
- return;
- }
- pFlags[iPos] = 0;
- pChunk->iFreeNum++;
- if (pChunk->iFreeNum == pChunk->iChunkSize) {
- if (!pPrior) {
- m_pChunk = pChunk->pNextChunk;
- } else {
- pPrior->pNextChunk = pChunk->pNextChunk;
- }
- FX_Free(pChunk);
- }
-}
-
-#endif // MEMORY_TOOL_REPLACES_ALLOCATOR