diff options
Diffstat (limited to 'Source/external/SDL2/src/test/SDL_test_memory.c')
| -rw-r--r-- | Source/external/SDL2/src/test/SDL_test_memory.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/Source/external/SDL2/src/test/SDL_test_memory.c b/Source/external/SDL2/src/test/SDL_test_memory.c new file mode 100644 index 0000000..6ce72f6 --- /dev/null +++ b/Source/external/SDL2/src/test/SDL_test_memory.c @@ -0,0 +1,274 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org> + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ +#include "SDL_config.h" +#include "SDL_assert.h" +#include "SDL_stdinc.h" +#include "SDL_log.h" +#include "SDL_test_crc32.h" +#include "SDL_test_memory.h" + +#ifdef HAVE_LIBUNWIND_H +#include <libunwind.h> +#endif + +/* This is a simple tracking allocator to demonstrate the use of SDL's + memory allocation replacement functionality. + + It gets slow with large numbers of allocations and shouldn't be used + for production code. +*/ + +typedef struct SDL_tracked_allocation +{ + void *mem; + size_t size; + Uint64 stack[10]; + char stack_names[10][256]; + struct SDL_tracked_allocation *next; +} SDL_tracked_allocation; + +static SDLTest_Crc32Context s_crc32_context; +static SDL_malloc_func SDL_malloc_orig = NULL; +static SDL_calloc_func SDL_calloc_orig = NULL; +static SDL_realloc_func SDL_realloc_orig = NULL; +static SDL_free_func SDL_free_orig = NULL; +static int s_previous_allocations = 0; +static SDL_tracked_allocation *s_tracked_allocations[256]; + +static unsigned int get_allocation_bucket(void *mem) +{ + CrcUint32 crc_value; + unsigned int index; + SDLTest_Crc32Calc(&s_crc32_context, (CrcUint8 *)&mem, sizeof(mem), &crc_value); + index = (crc_value & (SDL_arraysize(s_tracked_allocations) - 1)); + return index; +} + +static SDL_bool SDL_IsAllocationTracked(void *mem) +{ + SDL_tracked_allocation *entry; + int index = get_allocation_bucket(mem); + for (entry = s_tracked_allocations[index]; entry; entry = entry->next) { + if (mem == entry->mem) { + return SDL_TRUE; + } + } + return SDL_FALSE; +} + +static void SDL_TrackAllocation(void *mem, size_t size) +{ + SDL_tracked_allocation *entry; + int index = get_allocation_bucket(mem); + + if (SDL_IsAllocationTracked(mem)) { + return; + } + entry = (SDL_tracked_allocation *)SDL_malloc_orig(sizeof(*entry)); + if (!entry) { + return; + } + entry->mem = mem; + entry->size = size; + + /* Generate the stack trace for the allocation */ + SDL_zero(entry->stack); +#ifdef HAVE_LIBUNWIND_H + { + int stack_index; + unw_cursor_t cursor; + unw_context_t context; + + unw_getcontext(&context); + unw_init_local(&cursor, &context); + + stack_index = 0; + while (unw_step(&cursor) > 0) { + unw_word_t offset, pc; + char sym[256]; + + unw_get_reg(&cursor, UNW_REG_IP, &pc); + entry->stack[stack_index] = pc; + + if (unw_get_proc_name(&cursor, sym, sizeof(sym), &offset) == 0) { + snprintf(entry->stack_names[stack_index], sizeof(entry->stack_names[stack_index]), "%s+0x%llx", sym, offset); + } + ++stack_index; + + if (stack_index == SDL_arraysize(entry->stack)) { + break; + } + } + } +#endif /* HAVE_LIBUNWIND_H */ + + entry->next = s_tracked_allocations[index]; + s_tracked_allocations[index] = entry; +} + +static void SDL_UntrackAllocation(void *mem) +{ + SDL_tracked_allocation *entry, *prev; + int index = get_allocation_bucket(mem); + + prev = NULL; + for (entry = s_tracked_allocations[index]; entry; entry = entry->next) { + if (mem == entry->mem) { + if (prev) { + prev->next = entry->next; + } else { + s_tracked_allocations[index] = entry->next; + } + SDL_free_orig(entry); + return; + } + prev = entry; + } +} + +static void * SDLCALL SDLTest_TrackedMalloc(size_t size) +{ + void *mem; + + mem = SDL_malloc_orig(size); + if (mem) { + SDL_TrackAllocation(mem, size); + } + return mem; +} + +static void * SDLCALL SDLTest_TrackedCalloc(size_t nmemb, size_t size) +{ + void *mem; + + mem = SDL_calloc_orig(nmemb, size); + if (mem) { + SDL_TrackAllocation(mem, nmemb * size); + } + return mem; +} + +static void * SDLCALL SDLTest_TrackedRealloc(void *ptr, size_t size) +{ + void *mem; + + SDL_assert(!ptr || SDL_IsAllocationTracked(ptr)); + mem = SDL_realloc_orig(ptr, size); + if (mem && mem != ptr) { + if (ptr) { + SDL_UntrackAllocation(ptr); + } + SDL_TrackAllocation(mem, size); + } + return mem; +} + +static void SDLCALL SDLTest_TrackedFree(void *ptr) +{ + if (!ptr) { + return; + } + + if (!s_previous_allocations) { + SDL_assert(SDL_IsAllocationTracked(ptr)); + } + SDL_UntrackAllocation(ptr); + SDL_free_orig(ptr); +} + +int SDLTest_TrackAllocations() +{ + if (SDL_malloc_orig) { + return 0; + } + + SDLTest_Crc32Init(&s_crc32_context); + + s_previous_allocations = SDL_GetNumAllocations(); + if (s_previous_allocations != 0) { + SDL_Log("SDLTest_TrackAllocations(): There are %d previous allocations, disabling free() validation", s_previous_allocations); + } + + SDL_GetMemoryFunctions(&SDL_malloc_orig, + &SDL_calloc_orig, + &SDL_realloc_orig, + &SDL_free_orig); + + SDL_SetMemoryFunctions(SDLTest_TrackedMalloc, + SDLTest_TrackedCalloc, + SDLTest_TrackedRealloc, + SDLTest_TrackedFree); + return 0; +} + +void SDLTest_LogAllocations() +{ + char *message = NULL; + size_t message_size = 0; + char line[128], *tmp; + SDL_tracked_allocation *entry; + int index, count, stack_index; + Uint64 total_allocated; + + if (!SDL_malloc_orig) { + return; + } + +#define ADD_LINE() \ + message_size += (SDL_strlen(line) + 1); \ + tmp = (char *)SDL_realloc_orig(message, message_size); \ + if (!tmp) { \ + return; \ + } \ + message = tmp; \ + SDL_strlcat(message, line, message_size) + + SDL_strlcpy(line, "Memory allocations:\n", sizeof(line)); + ADD_LINE(); + SDL_strlcpy(line, "Expect 2 allocations from within SDL_GetErrBuf()\n", sizeof(line)); + ADD_LINE(); + + count = 0; + total_allocated = 0; + for (index = 0; index < SDL_arraysize(s_tracked_allocations); ++index) { + for (entry = s_tracked_allocations[index]; entry; entry = entry->next) { + SDL_snprintf(line, sizeof(line), "Allocation %d: %d bytes\n", count, (int)entry->size); + ADD_LINE(); + /* Start at stack index 1 to skip our tracking functions */ + for (stack_index = 1; stack_index < SDL_arraysize(entry->stack); ++stack_index) { + if (!entry->stack[stack_index]) { + break; + } + SDL_snprintf(line, sizeof(line), "\t0x%"SDL_PRIx64": %s\n", entry->stack[stack_index], entry->stack_names[stack_index]); + ADD_LINE(); + } + total_allocated += entry->size; + ++count; + } + } + SDL_snprintf(line, sizeof(line), "Total: %.2f Kb in %d allocations\n", (float)total_allocated / 1024, count); + ADD_LINE(); +#undef ADD_LINE + + SDL_Log("%s", message); +} + +/* vi: set ts=4 sw=4 expandtab: */ |