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Core/MemoryManager: Add delete checks 

Now able to detect double-delete and dangling pointer delete


Former-commit-id: 7ac9ab7034b8b790333d5655aa0c82a49bb9309e
This commit is contained in:
Lynix 2015-06-21 13:20:10 +02:00
parent 9318d269e2
commit 80d4acfe32
1 changed files with 22 additions and 6 deletions
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28
src/Nazara/Core/MemoryManager.cpp
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@ -18,6 +18,9 @@
namespace
{
constexpr unsigned int s_allocatedId = 0xDEADB33FUL;
constexpr unsigned int s_freedId = 0x4B1DUL;
struct Block
{
std::size_t size;
@ -31,7 +34,6 @@ namespace
bool s_allocationLogging = false;
bool s_initialized = false;
const unsigned int s_magic = 0xDEADB33FUL;
const char* s_logFileName = "NazaraMemory.log";
thread_local const char* s_nextFreeFile = "(Internal error)";
thread_local unsigned int s_nextFreeLine = 0;
@ -44,7 +46,7 @@ namespace
&s_list,
false,
0,
s_magic
0
};
unsigned int s_allocationCount = 0;
@ -101,7 +103,7 @@ void* NzMemoryManager::Allocate(std::size_t size, bool multi, const char* file,
ptr->file = file;
ptr->line = line;
ptr->size = size;
ptr->magic = s_magic;
ptr->magic = s_allocatedId;
ptr->prev = s_list.prev;
ptr->next = &s_list;
@ -147,8 +149,22 @@ void NzMemoryManager::Free(void* pointer, bool multi)
return;
Block* ptr = reinterpret_cast<Block*>(reinterpret_cast<nzUInt8*>(pointer) - sizeof(Block));
if (ptr->magic != s_magic)
if (ptr->magic != s_allocatedId)
{
char timeStr[23];
TimeInfo(timeStr);
FILE* log = std::fopen(s_logFileName, "a");
const char* error = (ptr->magic == s_freedId) ? "double-delete" : "possible delete of dangling pointer";
if (s_nextFreeFile)
std::fprintf(log, "%s Warning: %s at %s:%u\n", timeStr, error, s_nextFreeFile, s_nextFreeLine);
else
std::fprintf(log, "%s Warning: %s at unknown position\n", timeStr, error);
std::fclose(log);
return;
}
#if defined(NAZARA_PLATFORM_WINDOWS)
EnterCriticalSection(&s_mutex);
@ -167,12 +183,12 @@ void NzMemoryManager::Free(void* pointer, bool multi)
if (s_nextFreeFile)
std::fprintf(log, "%s Warning: %s at %s:%u\n", timeStr, error, s_nextFreeFile, s_nextFreeLine);
else
std::fprintf(log, "%s Warning: %s at unknown position\n", error, timeStr);
std::fprintf(log, "%s Warning: %s at unknown position\n", timeStr, error);
std::fclose(log);
}
ptr->magic = 0; // Évitons des problèmes
ptr->magic = s_freedId;
ptr->prev->next = ptr->next;
ptr->next->prev = ptr->prev;