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Diffstat (limited to 'src/mesa/slang/slang_mem.c')
| -rw-r--r-- | src/mesa/slang/slang_mem.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/src/mesa/slang/slang_mem.c b/src/mesa/slang/slang_mem.c new file mode 100644 index 0000000000..5eaa7c4427 --- /dev/null +++ b/src/mesa/slang/slang_mem.c @@ -0,0 +1,243 @@ +/* + * Mesa 3-D graphics library + * Version: 6.5.3 + * + * Copyright (C) 2005-2007 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +/** + * \file slang_mem.c + * + * Memory manager for GLSL compiler. The general idea is to do all + * allocations out of a large pool then just free the pool when done + * compiling to avoid intricate malloc/free tracking and memory leaks. + * + * \author Brian Paul + */ + +#include "main/context.h" +#include "main/macros.h" +#include "slang_mem.h" + + +#define GRANULARITY 8 +#define ROUND_UP(B) ( ((B) + (GRANULARITY - 1)) & ~(GRANULARITY - 1) ) + + +/** If 1, use conventional malloc/free. Helpful for debugging */ +#define USE_MALLOC_FREE 0 + + +struct slang_mempool_ +{ + GLuint Size, Used, Count, Largest; + char *Data; + struct slang_mempool_ *Next; +}; + + +slang_mempool * +_slang_new_mempool(GLuint initialSize) +{ + slang_mempool *pool = (slang_mempool *) calloc(1, sizeof(slang_mempool)); + if (pool) { + pool->Data = (char *) calloc(1, initialSize); + /*printf("ALLOC MEMPOOL %d at %p\n", initialSize, pool->Data);*/ + if (!pool->Data) { + free(pool); + return NULL; + } + pool->Size = initialSize; + pool->Used = 0; + } + return pool; +} + + +void +_slang_delete_mempool(slang_mempool *pool) +{ + GLuint total = 0; + while (pool) { + slang_mempool *next = pool->Next; + /* + printf("DELETE MEMPOOL %u / %u count=%u largest=%u\n", + pool->Used, pool->Size, pool->Count, pool->Largest); + */ + total += pool->Used; + free(pool->Data); + free(pool); + pool = next; + } + /*printf("TOTAL ALLOCATED: %u\n", total);*/ +} + + +#ifdef DEBUG +static void +check_zero(const char *addr, GLuint n) +{ + GLuint i; + for (i = 0; i < n; i++) { + assert(addr[i]==0); + } +} +#endif + + +#ifdef DEBUG +static GLboolean +is_valid_address(const slang_mempool *pool, void *addr) +{ + while (pool) { + if ((char *) addr >= pool->Data && + (char *) addr < pool->Data + pool->Used) + return GL_TRUE; + + pool = pool->Next; + } + return GL_FALSE; +} +#endif + + +/** + * Alloc 'bytes' from shader mempool. + */ +void * +_slang_alloc(GLuint bytes) +{ +#if USE_MALLOC_FREE + return calloc(1, bytes); +#else + slang_mempool *pool; + GET_CURRENT_CONTEXT(ctx); + pool = (slang_mempool *) ctx->Shader.MemPool; + + if (bytes == 0) + bytes = 1; + + while (pool) { + if (pool->Used + bytes <= pool->Size) { + /* found room */ + void *addr = (void *) (pool->Data + pool->Used); +#ifdef DEBUG + check_zero((char*) addr, bytes); +#endif + pool->Used += ROUND_UP(bytes); + pool->Largest = MAX2(pool->Largest, bytes); + pool->Count++; + /*printf("alloc %u Used %u\n", bytes, pool->Used);*/ + return addr; + } + else if (pool->Next) { + /* try next block */ + pool = pool->Next; + } + else { + /* alloc new pool */ + const GLuint sz = MAX2(bytes, pool->Size); + pool->Next = _slang_new_mempool(sz); + if (!pool->Next) { + /* we're _really_ out of memory */ + return NULL; + } + else { + pool = pool->Next; + pool->Largest = bytes; + pool->Count++; + pool->Used = ROUND_UP(bytes); +#ifdef DEBUG + check_zero((char*) pool->Data, bytes); +#endif + return (void *) pool->Data; + } + } + } + return NULL; +#endif +} + + +void * +_slang_realloc(void *oldBuffer, GLuint oldSize, GLuint newSize) +{ +#if USE_MALLOC_FREE + return _mesa_realloc(oldBuffer, oldSize, newSize); +#else + GET_CURRENT_CONTEXT(ctx); + slang_mempool *pool = (slang_mempool *) ctx->Shader.MemPool; + (void) pool; + + if (newSize < oldSize) { + return oldBuffer; + } + else { + const GLuint copySize = (oldSize < newSize) ? oldSize : newSize; + void *newBuffer = _slang_alloc(newSize); + + if (oldBuffer) + ASSERT(is_valid_address(pool, oldBuffer)); + + if (newBuffer && oldBuffer && copySize > 0) + memcpy(newBuffer, oldBuffer, copySize); + + return newBuffer; + } +#endif +} + + +/** + * Clone string, storing in current mempool. + */ +char * +_slang_strdup(const char *s) +{ + if (s) { + size_t l = strlen(s); + char *s2 = (char *) _slang_alloc(l + 1); + if (s2) + strcpy(s2, s); + return s2; + } + else { + return NULL; + } +} + + +/** + * Don't actually free memory, but mark it (for debugging). + */ +void +_slang_free(void *addr) +{ +#if USE_MALLOC_FREE + free(addr); +#else + if (addr) { + GET_CURRENT_CONTEXT(ctx); + slang_mempool *pool = (slang_mempool *) ctx->Shader.MemPool; + (void) pool; + ASSERT(is_valid_address(pool, addr)); + } +#endif +} |