Index: /trunk/src/VBox/Runtime/alloc/heapsimple.cpp =================================================================== --- /trunk/src/VBox/Runtime/alloc/heapsimple.cpp (revision 329) +++ /trunk/src/VBox/Runtime/alloc/heapsimple.cpp (revision 329) @@ -0,0 +1,899 @@ +/* $Id$ */ +/** @file + * InnoTek Portable Runtime - A Simple Heap. + */ + +/* + * Copyright (C) 2006 InnoTek Systemberatung GmbH + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License as published by the Free Software Foundation, + * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE + * distribution. VirtualBox OSE is distributed in the hope that it will + * be useful, but WITHOUT ANY WARRANTY of any kind. + * + * If you received this file as part of a commercial VirtualBox + * distribution, then only the terms of your commercial VirtualBox + * license agreement apply instead of the previous paragraph. + */ + + +/******************************************************************************* +* Header Files * +*******************************************************************************/ +#define LOG_GROUP RTLOGGROUP_DEFAULT +#include +#include +#include +#include +#include +#include +#include + + +/******************************************************************************* +* Structures and Typedefs * +*******************************************************************************/ +/** Pointer to the heap anchor block. */ +typedef struct RTHEAPSIMPLEINTERNAL *PRTHEAPSIMPLEINTERNAL; +/** Pointer to a heap block. */ +typedef struct RTHEAPSIMPLEBLOCK *PRTHEAPSIMPLEBLOCK; +/** Pointer to a free heap block. */ +typedef struct RTHEAPSIMPLEFREE *PRTHEAPSIMPLEFREE; + +/** + * Structure describing a simple heap block. + * If this block is allocated, it is followed by the user user data. + * If this block is free, see RTHEAPSIMPLEFREE. + */ +typedef struct RTHEAPSIMPLEBLOCK +{ + /** The next block in the global block list. */ + PRTHEAPSIMPLEBLOCK pNext; + /** The previous block in the global block list. */ + PRTHEAPSIMPLEBLOCK pPrev; + /** Pointer to the heap anchor block. */ + PRTHEAPSIMPLEINTERNAL pHeap; + /** Flags + magic. */ + uintptr_t fFlags; +} RTHEAPSIMPLEBLOCK; +AssertCompileSizeAlignment(RTHEAPSIMPLEBLOCK, 16); + +/** The block is free if this flag is set. When cleared it's allocated. */ +#define RTHEAPSIMPLEBLOCK_FLAGS_FREE ((uintptr_t)BIT(0)) +/** The magic value. */ +#define RTHEAPSIMPLEBLOCK_FLAGS_MAGIC ((uintptr_t)0xabcdef00) +/** The mask that needs to be applied to RTHEAPSIMPLEBLOCK::fFalgs to obtain the magic value. */ +#define RTHEAPSIMPLEBLOCK_FLAGS_MAGIC_MASK (~(uintptr_t)BIT(0)) + +/** + * Checks if the specified block is valid or not. + * @returns boolean answer. + * @param pBlock Pointer to a RTHEAPSIMPLEBLOCK structure. + */ +#define RTHEAPSIMPLEBLOCK_IS_VALID(pBlock) \ + ( ((pBlock)->fFlags & RTHEAPSIMPLEBLOCK_FLAGS_MAGIC_MASK) == RTHEAPSIMPLEBLOCK_FLAGS_MAGIC ) + +/** + * Checks if the specified block is valid and in use. + * @returns boolean answer. + * @param pBlock Pointer to a RTHEAPSIMPLEBLOCK structure. + */ +#define RTHEAPSIMPLEBLOCK_IS_VALID_USED(pBlock) \ + ( ((pBlock)->fFlags & (RTHEAPSIMPLEBLOCK_FLAGS_MAGIC_MASK | RTHEAPSIMPLEBLOCK_FLAGS_FREE)) \ + == RTHEAPSIMPLEBLOCK_FLAGS_MAGIC ) + +/** + * Checks if the specified block is valid and free. + * @returns boolean answer. + * @param pBlock Pointer to a RTHEAPSIMPLEBLOCK structure. + */ +#define RTHEAPSIMPLEBLOCK_IS_VALID_FREE(pBlock) \ + ( ((pBlock)->fFlags & (RTHEAPSIMPLEBLOCK_FLAGS_MAGIC_MASK | RTHEAPSIMPLEBLOCK_FLAGS_FREE)) \ + == (RTHEAPSIMPLEBLOCK_FLAGS_MAGIC | RTHEAPSIMPLEBLOCK_FLAGS_FREE) ) + +/** + * Checks if the specified block is free or not. + * @returns boolean answer. + * @param pBlock Pointer to a valid RTHEAPSIMPLEBLOCK structure. + */ +#define RTHEAPSIMPLEBLOCK_IS_FREE(pBlock) (!!((pBlock)->fFlags & RTHEAPSIMPLEBLOCK_FLAGS_FREE)) + +/** + * A free heap block. + * This is an extended version of RTHEAPSIMPLEBLOCK that takes the unused + * user data to store free list pointers and a cached size value. + */ +typedef struct RTHEAPSIMPLEFREE +{ + /** Core stuff. */ + RTHEAPSIMPLEBLOCK Core; + /** Pointer to the next free block. */ + PRTHEAPSIMPLEFREE pNext; + /** Pointer to the previous free block. */ + PRTHEAPSIMPLEFREE pPrev; + /** The size of the block (excluding the RTHEAPSIMPLEBLOCK part). */ + size_t cb; + /** An alignment filler to make it a multiple of (sizeof(void *) * 2). */ + size_t Alignment; +} RTHEAPSIMPLEFREE; + + +/** + * The heap anchor block. + * This structure is placed at the head of the memory block specified to RTHeapSimpleInit(), + * which means that the first RTHEAPSIMPLEBLOCK appears immediately after this structure. + */ +typedef struct RTHEAPSIMPLEINTERNAL +{ + /** The typical magic (RTHEAPSIMPLE_MAGIC). */ + size_t uMagic; + /** The heap size. (This structure is not included!) */ + size_t cbHeap; + /** Pointer to the end of the heap. */ + void *pvEnd; + /** The amount of free memory in the heap. */ + size_t cbFree; + /** Free head pointer. */ + PRTHEAPSIMPLEFREE pFreeHead; + /** Free tail pointer. */ + PRTHEAPSIMPLEFREE pFreeTail; + /** Make the size of this structure is a multiple of 32. */ + size_t auAlignment[2]; +} RTHEAPSIMPLEINTERNAL; +AssertCompileSizeAlignment(RTHEAPSIMPLEINTERNAL, 32); + +/** Magic number for RTHEAPSIMPLEINTERNAL::u32Magic. (Kyoichi Katayama) */ +#define RTHEAPSIMPLE_MAGIC 0x19590105 + + +/** The minimum allocation size. */ +#define RTHEAPSIMPLE_MIN_BLOCK (sizeof(RTHEAPSIMPLEBLOCK)) +AssertCompile(RTHEAPSIMPLE_MIN_BLOCK >= sizeof(RTHEAPSIMPLEBLOCK)); +AssertCompile(RTHEAPSIMPLE_MIN_BLOCK >= sizeof(RTHEAPSIMPLEFREE) - sizeof(RTHEAPSIMPLEBLOCK)); + +/** The minimum and default alignment. */ +#define RTHEAPSIMPLE_ALIGNMENT (sizeof(RTHEAPSIMPLEBLOCK)) + + +/******************************************************************************* +* Defined Constants And Macros * +*******************************************************************************/ +#ifdef RT_STRICT +# define RTHEAPSIMPLE_STRICT 1 +#endif + +#define ASSERT_L(a, b) AssertMsg((uintptr_t)(a) < (uintptr_t)(b), ("a=%p b=%p\n", (uintptr_t)(a), (uintptr_t)(b))) +#define ASSERT_LE(a, b) AssertMsg((uintptr_t)(a) <= (uintptr_t)(b), ("a=%p b=%p\n", (uintptr_t)(a), (uintptr_t)(b))) +#define ASSERT_G(a, b) AssertMsg((uintptr_t)(a) > (uintptr_t)(b), ("a=%p b=%p\n", (uintptr_t)(a), (uintptr_t)(b))) +#define ASSERT_GE(a, b) AssertMsg((uintptr_t)(a) >= (uintptr_t)(b), ("a=%p b=%p\n", (uintptr_t)(a), (uintptr_t)(b))) +#define ASSERT_ALIGN(a) AssertMsg(!((uintptr_t)(a) & (RTHEAPSIMPLE_ALIGNMENT - 1)), ("a=%p\n", (uintptr_t)(a))) + +#define ASSERT_PREV(pHeapInt, pBlock) \ + do { ASSERT_ALIGN((pBlock)->pPrev); \ + if ((pBlock)->pPrev) \ + { \ + ASSERT_L((pBlock)->pPrev, (pBlock)); \ + ASSERT_GE((pBlock)->pPrev, (pHeapInt) + 1); \ + } \ + else \ + Assert((pBlock) == (PRTHEAPSIMPLEBLOCK)((pHeapInt) + 1)); \ + } while (0) + +#define ASSERT_NEXT(pHeap, pBlock) \ + do { ASSERT_ALIGN((pBlock)->pNext); \ + if ((pBlock)->pNext) \ + { \ + ASSERT_L((pBlock)->pNext, (pHeapInt)->pvEnd); \ + ASSERT_G((pBlock)->pNext, (pBlock)); \ + } \ + } while (0) + +#define ASSERT_BLOCK(pHeapInt, pBlock) \ + do { AssertMsg(RTHEAPSIMPLEBLOCK_IS_VALID(pBlock), ("%#x\n", (pBlock)->fFlags)); \ + AssertMsg((pBlock)->pHeap == (pHeapInt), ("%p != %p\n", (pBlock)->pHeap, (pHeapInt))); \ + ASSERT_GE((pBlock), (pHeapInt) + 1); \ + ASSERT_L((pBlock), (pHeapInt)->pvEnd); \ + ASSERT_NEXT(pHeapInt, pBlock); \ + ASSERT_PREV(pHeapInt, pBlock); \ + } while (0) + +#define ASSERT_BLOCK_USED(pHeapInt, pBlock) \ + do { AssertMsg(RTHEAPSIMPLEBLOCK_IS_VALID_USED((pBlock)), ("%#x\n", (pBlock)->fFlags)); \ + AssertMsg((pBlock)->pHeap == (pHeapInt), ("%p != %p\n", (pBlock)->pHeap, (pHeapInt))); \ + ASSERT_GE((pBlock), (pHeapInt) + 1); \ + ASSERT_L((pBlock), (pHeapInt)->pvEnd); \ + ASSERT_NEXT(pHeapInt, pBlock); \ + ASSERT_PREV(pHeapInt, pBlock); \ + } while (0) + +#define ASSERT_FREE_PREV(pHeapInt, pBlock) \ + do { ASSERT_ALIGN((pBlock)->pPrev); \ + if ((pBlock)->pPrev) \ + { \ + ASSERT_GE((pBlock)->pPrev, (pHeapInt)->pFreeHead); \ + ASSERT_L((pBlock)->pPrev, (pBlock)); \ + ASSERT_LE((pBlock)->pPrev, (pBlock)->Core.pPrev); \ + } \ + else \ + Assert((pBlock) == (pHeapInt)->pFreeHead); \ + } while (0) + +#define ASSERT_FREE_NEXT(pHeapInt, pBlock) \ + do { ASSERT_ALIGN((pBlock)->pNext); \ + if ((pBlock)->pNext) \ + { \ + ASSERT_LE((pBlock)->pNext, (pHeapInt)->pFreeTail); \ + ASSERT_G((pBlock)->pNext, (pBlock)); \ + ASSERT_GE((pBlock)->pNext, (pBlock)->Core.pNext); \ + } \ + else \ + Assert((pBlock) == (pHeapInt)->pFreeTail); \ + } while (0) + +#ifdef RTHEAPSIMPLE_STRICT +# define ASSERT_FREE_CB(pHeapInt, pBlock) \ + do { size_t cbCalc = ((pBlock)->Core.pNext ? (uintptr_t)(pBlock)->Core.pNext : (uintptr_t)(pHeapInt)->pvEnd) \ + - (uintptr_t)(pBlock) - sizeof(RTHEAPSIMPLEBLOCK); \ + AssertMsg((pBlock)->cb == cbCalc, ("cb=%#zx cbCalc=%#zx\n", (pBlock)->cb, cbCalc)); \ + } while (0) +#else +# define ASSERT_FREE_CB(pHeapInt, pBlock) do {} while (0) +#endif + +/** Asserts that a free block is valid. */ +#define ASSERT_BLOCK_FREE(pHeapInt, pBlock) \ + do { ASSERT_BLOCK(pHeapInt, &(pBlock)->Core); \ + Assert(RTHEAPSIMPLEBLOCK_IS_VALID_FREE(&(pBlock)->Core)); \ + ASSERT_GE((pBlock), (pHeapInt)->pFreeHead); \ + ASSERT_LE((pBlock), (pHeapInt)->pFreeTail); \ + ASSERT_FREE_NEXT(pHeapInt, pBlock); \ + ASSERT_FREE_PREV(pHeapInt, pBlock); \ + ASSERT_FREE_CB(pHeapInt, pBlock); \ + } while (0) + +/** Asserts that the heap anchor block is ok. */ +#define ASSERT_ANCHOR(pHeapInt) \ + do { AssertPtr(pHeapInt);\ + Assert((pHeapInt)->uMagic == RTHEAPSIMPLE_MAGIC); \ + } while (0) + + +/******************************************************************************* +* Internal Functions * +*******************************************************************************/ +#ifdef RTHEAPSIMPLE_STRICT +static void rtHeapSimpleAssertAll(PRTHEAPSIMPLEINTERNAL pHeapInt); +#endif +static PRTHEAPSIMPLEBLOCK rtHeapSimpleAllocBlock(PRTHEAPSIMPLEINTERNAL pHeapInt, size_t cb, size_t uAlignment); +static void rtHeapSimpleFreeBlock(PRTHEAPSIMPLEINTERNAL pHeapInt, PRTHEAPSIMPLEBLOCK pBlock); + + +/** + * Initializes the heap. + * + * @returns IPRT status code on success. + * @param pHeap Where to store the heap anchor block on success. + * @param pvMemory Pointer to the heap memory. + * @param cbMemory The size of the heap memory. + */ +RTDECL(int) RTHeapSimpleInit(PRTHEAPSIMPLE pHeap, void *pvMemory, size_t cbMemory) +{ + /* + * Validate input. The imposed minimum heap size is just a convenien value. + */ + AssertReturn(cbMemory >= PAGE_SIZE, VERR_INVALID_PARAMETER); + AssertPtrReturn(pvMemory, VERR_INVALID_POINTER); + AssertReturn((uintptr_t)pvMemory + (cbMemory - 1) > (uintptr_t)cbMemory, VERR_INVALID_PARAMETER); + + /* + * Place the heap anchor block at the start of the heap memory, + * enforce 32 byte alignment of it. Also align the heap size correctly. + */ + PRTHEAPSIMPLEINTERNAL pHeapInt = (PRTHEAPSIMPLEINTERNAL)pvMemory; + if ((uintptr_t)pvMemory & 31) + { + const unsigned off = 32 - ((uintptr_t)pvMemory & 31); + cbMemory -= off; + pHeapInt = (PRTHEAPSIMPLEINTERNAL)((uintptr_t)pvMemory + off); + } + cbMemory &= ~(RTHEAPSIMPLE_ALIGNMENT - 1); + + + /* Init the heap anchor block. */ + pHeapInt->uMagic = RTHEAPSIMPLE_MAGIC; + pHeapInt->pvEnd = (uint8_t *)pHeapInt + cbMemory; + pHeapInt->cbHeap = cbMemory; + pHeapInt->cbFree = cbMemory + - sizeof(RTHEAPSIMPLEBLOCK) + - sizeof(RTHEAPSIMPLEINTERNAL); + pHeapInt->pFreeTail = pHeapInt->pFreeHead = (PRTHEAPSIMPLEFREE)(pHeapInt + 1); + for (unsigned i = 0; i < ELEMENTS(pHeapInt->auAlignment); i++) + pHeapInt->auAlignment[i] = ~(size_t)0; + + /* Init the single free block. */ + PRTHEAPSIMPLEFREE pFree = pHeapInt->pFreeHead; + pFree->Core.pNext = NULL; + pFree->Core.pPrev = NULL; + pFree->Core.pHeap = pHeapInt; + pFree->Core.fFlags = RTHEAPSIMPLEBLOCK_FLAGS_MAGIC | RTHEAPSIMPLEBLOCK_FLAGS_FREE; + pFree->pNext = NULL; + pFree->pPrev = NULL; + pFree->cb = pHeapInt->cbFree; + + *pHeap = pHeapInt; + +#ifdef RTHEAPSIMPLE_STRICT + rtHeapSimpleAssertAll(pHeapInt); +#endif + return VINF_SUCCESS; +} + + + +/** + * Allocates memory from the specified simple heap. + * + * @returns Pointer to the allocated memory block on success. + * @returns NULL if the request cannot be satisfied. (A VERR_NO_MEMORY condition.) + * + * @param Heap The heap to allocate the memory on. + * @param cb The requested heap block size. + * @param cbAlignment The requested heap block alignment. Pass 0 for default alignment. + * Must be a power of 2. + */ +RTDECL(void *) RTHeapSimpleAlloc(RTHEAPSIMPLE Heap, size_t cb, size_t cbAlignment) +{ + PRTHEAPSIMPLEINTERNAL pHeapInt = Heap; + + /* + * Validate and adjust the input. + */ + AssertPtrReturn(pHeapInt, NULL); + if (cb < RTHEAPSIMPLE_MIN_BLOCK) + cb = RTHEAPSIMPLE_MIN_BLOCK; + else + cb = RT_ALIGN_Z(cb, RTHEAPSIMPLE_ALIGNMENT); + if (!cbAlignment) + cbAlignment = RTHEAPSIMPLE_ALIGNMENT; + else + { + Assert(!(cbAlignment & (cbAlignment - 1))); + Assert((cbAlignment & ~(cbAlignment - 1)) == cbAlignment); + if (cbAlignment < RTHEAPSIMPLE_ALIGNMENT) + cbAlignment = RTHEAPSIMPLE_ALIGNMENT; + } + + /* + * Do the allocation. + */ + PRTHEAPSIMPLEBLOCK pBlock = rtHeapSimpleAllocBlock(pHeapInt, cb, cbAlignment); + if (RT_LIKELY(pBlock)) + { + void *pv = pBlock + 1; + return pv; + } + return NULL; +} + + +/** + * Allocates zeroed memory from the specified simple heap. + * + * @returns Pointer to the allocated memory block on success. + * @returns NULL if the request cannot be satisfied. (A VERR_NO_MEMORY condition.) + * + * @param Heap The heap to allocate the memory on. + * @param cb The requested heap block size. + * @param cbAlignment The requested heap block alignment. Pass 0 for default alignment. + * Must be a power of 2. + */ +RTDECL(void *) RTHeapSimpleAllocZ(RTHEAPSIMPLE Heap, size_t cb, size_t cbAlignment) +{ + PRTHEAPSIMPLEINTERNAL pHeapInt = Heap; + + /* + * Validate and adjust the input. + */ + AssertPtrReturn(pHeapInt, NULL); + if (cb < RTHEAPSIMPLE_MIN_BLOCK) + cb = RTHEAPSIMPLE_MIN_BLOCK; + else + cb = RT_ALIGN_Z(cb, RTHEAPSIMPLE_ALIGNMENT); + if (!cbAlignment) + cbAlignment = RTHEAPSIMPLE_ALIGNMENT; + else + { + Assert(!(cbAlignment & (cbAlignment - 1))); + Assert((cbAlignment & ~(cbAlignment - 1)) == cbAlignment); + if (cbAlignment < RTHEAPSIMPLE_ALIGNMENT) + cbAlignment = RTHEAPSIMPLE_ALIGNMENT; + } + + /* + * Do the allocation. + */ + PRTHEAPSIMPLEBLOCK pBlock = rtHeapSimpleAllocBlock(pHeapInt, cb, cbAlignment); + if (RT_LIKELY(pBlock)) + { + void *pv = pBlock + 1; + memset(pv, 0, cb); + return pv; + } + return NULL; +} + + +/** + * Allocates a block of memory from the specified heap. + * + * No parameter validation or adjustment is preformed. + * + * @returns Pointer to the allocated block. + * @returns NULL on failure. + * @param pHeap The heap. + * @param cb Size of the memory block to allocate. + * @param uAlignment The alignment specifications for the allocated block. + */ +static PRTHEAPSIMPLEBLOCK rtHeapSimpleAllocBlock(PRTHEAPSIMPLEINTERNAL pHeapInt, size_t cb, size_t uAlignment) +{ +#ifdef RTHEAPSIMPLE_STRICT + rtHeapSimpleAssertAll(pHeapInt); +#endif + + /* + * Search for a fitting block from the lower end of the heap. + */ + PRTHEAPSIMPLEBLOCK pRet = NULL; + for (PRTHEAPSIMPLEFREE pFree = pHeapInt->pFreeHead; + pFree; + pFree = pFree->pNext) + { + ASSERT_BLOCK_FREE(pHeapInt, pFree); + + /* + * Match for size and alignment. + */ + if (pFree->cb < cb) + continue; + uintptr_t offAlign = (uintptr_t)(&pFree->Core + 1) & (uAlignment - 1); + if (offAlign) + { + offAlign = uAlignment - offAlign; + if (pFree->cb - offAlign < cb) + continue; + + /* + * Make a stack copy of the free block header and adjust the pointer. + */ + RTHEAPSIMPLEFREE Free = *pFree; + pFree = (PRTHEAPSIMPLEFREE)((uintptr_t)pFree + offAlign); + + /* + * Donate offAlign bytes to the node in front of us. + * If we're the head node, we'll have to create a fake node. We'll + * mark it USED for simplicity. + * + * (Should this policy of donating memory to the guy in front of us + * cause big 'leaks', we could create a new free node if there is room + * for that.) + */ + PRTHEAPSIMPLEBLOCK pPrev = Free.Core.pPrev; + if (pPrev) + { + AssertMsg(!RTHEAPSIMPLEBLOCK_IS_FREE(pPrev), ("Impossible!\n")); + pPrev->pNext = &pFree->Core; + } + else + { + pPrev = (PRTHEAPSIMPLEBLOCK)(pHeapInt + 1); + Assert(pPrev == &pFree->Core); + pPrev->pPrev = NULL; + pPrev->pNext = &pFree->Core; + pPrev->pHeap = pHeapInt; + pPrev->fFlags = RTHEAPSIMPLEBLOCK_FLAGS_MAGIC; + } + pHeapInt->cbFree -= offAlign; + + /* + * Recreate pFree in the new position and adjust the neighbours. + */ + *pFree = Free; + + /* the core */ + if (pFree->Core.pNext) + pFree->Core.pNext->pPrev = &pFree->Core; + pFree->Core.pPrev = pPrev; + + /* the free part */ + pFree->cb -= offAlign; + if (pFree->pNext) + pFree->pNext->pPrev = pFree; + else + pHeapInt->pFreeTail = pFree; + if (pFree->pPrev) + pFree->pPrev->pNext = pFree; + else + pHeapInt->pFreeHead = pFree; + ASSERT_BLOCK_FREE(pHeapInt, pFree); + ASSERT_BLOCK_USED(pHeapInt, pPrev); + } + + /* + * Split off a new FREE block? + */ + if (pFree->cb >= cb + RT_ALIGN_Z(sizeof(RTHEAPSIMPLEFREE), RTHEAPSIMPLE_ALIGNMENT)) + { + /* + * Move the FREE block up to make room for the new USED block. + */ + PRTHEAPSIMPLEFREE pNew = (PRTHEAPSIMPLEFREE)((uintptr_t)&pFree->Core + cb + sizeof(RTHEAPSIMPLEBLOCK)); + + pNew->Core.pNext = pFree->Core.pNext; + if (pFree->Core.pNext) + pFree->Core.pNext->pPrev = &pNew->Core; + pNew->Core.pPrev = &pFree->Core; + pNew->Core.pHeap = pHeapInt; + pNew->Core.fFlags = RTHEAPSIMPLEBLOCK_FLAGS_MAGIC | RTHEAPSIMPLEBLOCK_FLAGS_FREE; + + pNew->pNext = pFree->pNext; + if (pNew->pNext) + pNew->pNext->pPrev = pNew; + else + pHeapInt->pFreeTail = pNew; + pNew->pPrev = pFree->pPrev; + if (pNew->pPrev) + pNew->pPrev->pNext = pNew; + else + pHeapInt->pFreeHead = pNew; + pNew->cb = (pNew->Core.pNext ? (uintptr_t)pNew->Core.pNext : (uintptr_t)pHeapInt->pvEnd) \ + - (uintptr_t)pNew - sizeof(RTHEAPSIMPLEBLOCK); + ASSERT_BLOCK_FREE(pHeapInt, pNew); + + /* + * Update the old FREE node making it a USED node. + */ + pFree->Core.fFlags &= ~RTHEAPSIMPLEBLOCK_FLAGS_FREE; + pFree->Core.pNext = &pNew->Core; + pHeapInt->cbFree -= pFree->cb; + pHeapInt->cbFree += pNew->cb; + pRet = &pFree->Core; + ASSERT_BLOCK_USED(pHeapInt, pRet); + } + else + { + /* + * Link it out of the free list. + */ + if (pFree->pNext) + pFree->pNext->pPrev = pFree->pPrev; + else + pHeapInt->pFreeTail = pFree->pPrev; + if (pFree->pPrev) + pFree->pPrev->pNext = pFree->pNext; + else + pHeapInt->pFreeHead = pFree->pNext; + + /* + * Convert it to a used block. + */ + pHeapInt->cbFree -= pFree->cb; + pFree->Core.fFlags &= ~RTHEAPSIMPLEBLOCK_FLAGS_FREE; + pRet = &pFree->Core; + ASSERT_BLOCK_USED(pHeapInt, pRet); + } + break; + } + +#ifdef RTHEAPSIMPLE_STRICT + rtHeapSimpleAssertAll(pHeapInt); +#endif + return pRet; +} + + + + +/** + * Frees memory allocated from a simple heap. + * + * @param Heap The heap. This is optional and will only be used for strict assertions. + * @param pv The heap block returned by RTHeapSimple + */ +RTDECL(void) RTHeapSimpleFree(RTHEAPSIMPLE Heap, void *pv) +{ + /* + * Validate input. + */ + if (!pv) + return; + AssertPtr(pv); + Assert(RT_ALIGN_P(pv, RTHEAPSIMPLE_ALIGNMENT) == pv); + + /* + * Get the block and heap. If in strict mode, validate these. + */ + PRTHEAPSIMPLEBLOCK pBlock = (PRTHEAPSIMPLEBLOCK)pv - 1; + PRTHEAPSIMPLEINTERNAL pHeapInt = pBlock->pHeap; + ASSERT_BLOCK_USED(pHeapInt, pBlock); + ASSERT_ANCHOR(pHeapInt); + Assert(pHeapInt == (PRTHEAPSIMPLEINTERNAL)Heap || !Heap); + +#ifdef RTHEAPSIMPLE_FREE_POISON + /* + * Poison the block. + */ + const size_t cbBlock = (pBlock->pNext ? (uintptr_t)pBlock->pNext : (uintptr_t)pHeapInt->pvEnd) + - (uintptr_t)pBlock - sizeof(RTHEAPSIMPLEBLOCK); + memset(pBlock + 1, RTHEAPSIMPLE_FREE_POISON, cbBlock); +#endif + + /* + * Call worker which does the actual job. + */ + rtHeapSimpleFreeBlock(pHeapInt, pBlock); +} + + +/** + * Free memory a memory block. + * + * @param pHeapInt The heap. + * @param pBlock The memory block to free. + */ +static void rtHeapSimpleFreeBlock(PRTHEAPSIMPLEINTERNAL pHeapInt, PRTHEAPSIMPLEBLOCK pBlock) +{ + PRTHEAPSIMPLEFREE pFree = (PRTHEAPSIMPLEFREE)pBlock; + +#ifdef RTHEAPSIMPLE_STRICT + rtHeapSimpleAssertAll(pHeapInt); +#endif + + /* + * Look for the closest free list blocks by walking the blocks right + * of us (both list are sorted on address). + */ + PRTHEAPSIMPLEFREE pLeft = NULL; + PRTHEAPSIMPLEFREE pRight = NULL; + if (pHeapInt->pFreeTail) + { + pRight = (PRTHEAPSIMPLEFREE)pFree->Core.pNext; + while (pRight && !RTHEAPSIMPLEBLOCK_IS_FREE(&pRight->Core)) + { + ASSERT_BLOCK(pHeapInt, &pRight->Core); + pRight = (PRTHEAPSIMPLEFREE)pRight->Core.pNext; + } + if (!pRight) + pLeft = pHeapInt->pFreeTail; + else + { + ASSERT_BLOCK_FREE(pHeapInt, pRight); + pLeft = pRight->pPrev; + } + if (pLeft) + ASSERT_BLOCK_FREE(pHeapInt, pLeft); + } + AssertMsgReturnVoid(pLeft != pFree, ("Freed twice! pv=%p (pBlock=%p)\n", pBlock + 1, pBlock)); + ASSERT_L(pLeft, pFree); + Assert(!pRight || (uintptr_t)pRight > (uintptr_t)pFree); + Assert(!pLeft || pLeft->pNext == pRight); + + /* + * Insert at the head of the free block list? + */ + if (!pLeft) + { + Assert(pRight == pHeapInt->pFreeHead); + pFree->Core.fFlags |= RTHEAPSIMPLEBLOCK_FLAGS_FREE; + pFree->pPrev = NULL; + pFree->pNext = pRight; + if (pRight) + pRight->pPrev = pFree; + else + pHeapInt->pFreeTail = pFree; + pHeapInt->pFreeHead = pFree; + } + else + { + /* + * Can we merge with left hand free block? + */ + if (pLeft->Core.pNext == &pFree->Core) + { + pLeft->Core.pNext = pFree->Core.pNext; + if (pFree->Core.pNext) + pFree->Core.pNext->pPrev = &pLeft->Core; + pHeapInt->cbFree -= pLeft->cb; + pFree = pLeft; + } + /* + * No, just link it into the free list then. + */ + else + { + pFree->Core.fFlags |= RTHEAPSIMPLEBLOCK_FLAGS_FREE; + pFree->pNext = pRight; + pFree->pPrev = pLeft; + pLeft->pNext = pFree; + if (pRight) + pRight->pPrev = pFree; + else + pHeapInt->pFreeTail = pFree; + } + } + + /* + * Can we merge with right hand free block? + */ + if ( pRight + && pRight->Core.pPrev == &pFree->Core) + { + /* core */ + pFree->Core.pNext = pRight->Core.pNext; + if (pRight->Core.pNext) + pRight->Core.pNext->pPrev = &pFree->Core; + + /* free */ + pFree->pNext = pRight->pNext; + if (pRight->pNext) + pRight->pNext->pPrev = pFree; + else + pHeapInt->pFreeTail = pFree; + pHeapInt->cbFree -= pRight->cb; + } + + /* + * Calculate the size and update free stats. + */ + pFree->cb = (pFree->Core.pNext ? (uintptr_t)pFree->Core.pNext : (uintptr_t)pHeapInt->pvEnd) + - (uintptr_t)pFree - sizeof(RTHEAPSIMPLEBLOCK); + pHeapInt->cbFree += pFree->cb; + ASSERT_BLOCK_FREE(pHeapInt, pFree); + +#ifdef RTHEAPSIMPLE_STRICT + rtHeapSimpleAssertAll(pHeapInt); +#endif +} + + +#ifdef RTHEAPSIMPLE_STRICT +/** + * Internal consitency check (relying on assertions). + * @param pHeapInt + */ +static void rtHeapSimpleAssertAll(PRTHEAPSIMPLEINTERNAL pHeapInt) +{ + PRTHEAPSIMPLEFREE pPrev = NULL; + PRTHEAPSIMPLEFREE pPrevFree = NULL; + for (PRTHEAPSIMPLEFREE pBlock = (PRTHEAPSIMPLEFREE)(pHeapInt + 1); + pBlock; + pBlock = (PRTHEAPSIMPLEFREE)pBlock->Core.pNext) + { + if (RTHEAPSIMPLEBLOCK_IS_FREE(&pBlock->Core)) + { + ASSERT_BLOCK_FREE(pHeapInt, pBlock); + Assert(pBlock->pPrev == pPrevFree); + Assert(pPrevFree || pHeapInt->pFreeHead == pBlock); + pPrevFree = pBlock; + } + else + ASSERT_BLOCK_USED(pHeapInt, &pBlock->Core); + Assert(!pPrev || pPrev == (PRTHEAPSIMPLEFREE)pBlock->Core.pPrev); + pPrev = pBlock; + } + Assert(pHeapInt->pFreeTail == pPrevFree); +} +#endif + + +/** + * Gets the size of the specified heap block. + * + * @returns The actual size of the heap block. + * @returns 0 if \a pv is NULL or it doesn't point to a valid heap block. An invalid \a pv + * can also cause traps or trigger assertions. + * @param Heap The heap. This is optional and will only be used for strict assertions. + * @param pv The heap block returned by RTHeapSimple + */ +RTDECL(size_t) RTHeapSimpleSize(RTHEAPSIMPLE Heap, void *pv) +{ + /* + * Validate input. + */ + if (!pv) + return 0; + AssertPtrReturn(pv, 0); + AssertReturn(RT_ALIGN_P(pv, RTHEAPSIMPLE_ALIGNMENT) == pv, 0); + + /* + * Get the block and heap. If in strict mode, validate these. + */ + PRTHEAPSIMPLEBLOCK pBlock = (PRTHEAPSIMPLEBLOCK)pv - 1; + PRTHEAPSIMPLEINTERNAL pHeapInt = pBlock->pHeap; + ASSERT_BLOCK_USED(pHeapInt, pBlock); + ASSERT_ANCHOR(pHeapInt); + Assert(pHeapInt == (PRTHEAPSIMPLEINTERNAL)Heap || !Heap); + + /* + * Calculate the block size. + */ + const size_t cbBlock = (pBlock->pNext ? (uintptr_t)pBlock->pNext : (uintptr_t)pHeapInt->pvEnd) + - (uintptr_t)pBlock- sizeof(RTHEAPSIMPLEBLOCK); + return cbBlock; +} + + +/** + * Gets the size of the heap. + * + * This size includes all the internal heap structures. So, even if the heap is + * empty the RTHeapSimpleGetFreeSize() will never reach the heap size returned + * by this function. + * + * @returns The heap size. + * @returns 0 if heap was safely detected as being bad. + * @param Heap The heap. + */ +RTDECL(size_t) RTHeapSimpleGetHeapSize(RTHEAPSIMPLE Heap) +{ + if (Heap == NIL_RTHEAPSIMPLE) + return 0; + PRTHEAPSIMPLEINTERNAL pHeapInt = Heap; + AssertPtrReturn(pHeapInt, 0); + ASSERT_ANCHOR(pHeapInt); + return pHeapInt->cbHeap; +} + + +/** + * Returns the sum of all free heap blocks. + * + * This is the amount of memory you can theoretically allocate + * if you do allocations exactly matching the free blocks. + * + * @returns The size of the free blocks. + * @returns 0 if heap was safely detected as being bad. + * @param Heap The heap. + */ +RTDECL(size_t) RTHeapSimpleGetFreeSize(RTHEAPSIMPLE Heap) +{ + if (Heap == NIL_RTHEAPSIMPLE) + return 0; + PRTHEAPSIMPLEINTERNAL pHeapInt = Heap; + AssertPtrReturn(pHeapInt, 0); + ASSERT_ANCHOR(pHeapInt); + return pHeapInt->cbFree; +} + + +/** + * Dumps the hypervisor heap. + * + * @param Heap The heap handle. + * @param pfnPrintf Printf like function that groks IPRT formatting. + */ +RTDECL(void) RTHeapSimpleDump(RTHEAPSIMPLE Heap, PFNRTHEAPSIMPLEPRINTF pfnPrintf) +{ + PRTHEAPSIMPLEINTERNAL pHeapInt = (PRTHEAPSIMPLEINTERNAL)Heap; + pfnPrintf("**** Dumping Heap %p - cbHeap=%zx cbFree=%zx ****\n", + Heap, pHeapInt->cbHeap, pHeapInt->cbFree); + + for (PRTHEAPSIMPLEFREE pBlock = (PRTHEAPSIMPLEFREE)(pHeapInt + 1); + pBlock; + pBlock = (PRTHEAPSIMPLEFREE)pBlock->Core.pNext) + { + size_t cb = (pBlock->pNext ? (uintptr_t)pBlock->Core.pNext : (uintptr_t)pHeapInt->pvEnd) + - (uintptr_t)pBlock - sizeof(RTHEAPSIMPLEBLOCK); + if (RTHEAPSIMPLEBLOCK_IS_FREE(&pBlock->Core)) + pfnPrintf("%p %06x FREE pNext=%p pPrev=%p fFlags=%#x cb=%#06x : cb=%#06x pNext=%p pPrev=%p\n", + pBlock, (uintptr_t)pBlock - (uintptr_t)(pHeapInt + 1), pBlock->Core.pNext, pBlock->Core.pPrev, pBlock->Core.fFlags, cb, + pBlock->cb, pBlock->pNext, pBlock->pPrev); + else + pfnPrintf("%p %06x USED pNext=%p pPrev=%p fFlags=%#x cb=%#06x\n", + pBlock, (uintptr_t)pBlock - (uintptr_t)(pHeapInt + 1), pBlock->Core.pNext, pBlock->Core.pPrev, pBlock->Core.fFlags, cb); + } + pfnPrintf("**** Done dumping Heap %p ****\n", Heap); +} +