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add DebugAllocation option to heap.cpp to help detect allocation and deallocation errors

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This commit is contained in:
Joel Dice 2009-06-11 17:23:02 -06:00
parent e1c7504eda
commit 31976f585a
1 changed files with 28 additions and 1 deletions
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29
src/heap.cpp
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@ -33,6 +33,7 @@ const bool Verbose = false;
const bool Verbose2 = false;
const bool Debug = false;
const bool DebugFixies = false;
const bool DebugAllocation = false;
#define ACQUIRE(x) MutexLock MAKE_NAME(monitorLock_) (x)
@ -1673,11 +1674,23 @@ void* tryAllocate(Context* c, unsigned size)
{
ACQUIRE(c->lock);
if (DebugAllocation) {
size = pad(size);
size += 2 * BytesPerWord;
}
if (size + c->count < c->limit) {
void* p = c->system->tryAllocate(size);
if (p) {
c->count += size;
return p;
if (DebugAllocation) {
static_cast<uintptr_t*>(p)[0] = 0x22377322;
static_cast<uintptr_t*>(p)[(size / BytesPerWord) - 1] = 0x22377322;
return static_cast<uintptr_t*>(p) + 1;
} else {
return p;
}
}
}
return 0;
@ -1687,6 +1700,20 @@ void free(Context* c, const void* p, unsigned size) {
ACQUIRE(c->lock);
expect(c->system, c->count >= size);
if (DebugAllocation) {
memset(const_cast<void*>(p), 0xFE, size);
size = pad(size);
p = static_cast<const uintptr_t*>(p) - 1;
expect(c->system, static_cast<const uintptr_t*>(p)[0] == 0x22377322);
expect(c->system, static_cast<const uintptr_t*>(p)
[1 + (size / BytesPerWord)] == 0x22377322);
}
c->system->free(p);
c->count -= size;
}