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MSVC Debug builds: Added operator new redirection to provide more info. (#3781)

This commit is contained in:
Mattes D 2017-06-19 11:09:16 +02:00 committed by GitHub
parent 801084c38c
commit b0f3336533
2 changed files with 44 additions and 0 deletions
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26
src/AllocationPool.h
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@ -81,7 +81,19 @@ public:
void * space = malloc(sizeof(T));
if (space != nullptr)
{
#if defined(_MSC_VER) && defined(_DEBUG)
// The debugging-new that is set up using macros in Globals.h doesn't support the placement-new syntax used here.
// Temporarily disable the macro
#pragma push_macro("new")
#undef new
#endif
return new(space) T;
#if defined(_MSC_VER) && defined(_DEBUG)
// Re-enable the debugging-new macro
#pragma pop_macro("new")
#endif
}
else if (m_FreeList.size() == NumElementsInReserve)
{
@ -95,7 +107,21 @@ public:
}
}
// placement new, used to initalize the object
#if defined(_MSC_VER) && defined(_DEBUG)
// The debugging-new that is set up using macros in Globals.h doesn't support the placement-new syntax used here.
// Temporarily disable the macro
#pragma push_macro("new")
#undef new
#endif
T * ret = new (m_FreeList.front()) T;
#if defined(_MSC_VER) && defined(_DEBUG)
// Re-enable the debugging-new macro
#pragma pop_macro("new")
#endif
m_FreeList.pop_front();
return ret;
}

18
src/Globals.h
View File

@ -60,6 +60,24 @@
// Use non-standard defines in <cmath>
#define _USE_MATH_DEFINES
#ifdef _DEBUG
// Override the "new" operator to include file and line specification for debugging memory leaks
// Ref.: https://social.msdn.microsoft.com/Forums/en-US/ebc7dd7a-f3c6-49f1-8a60-e381052f21b6/debugging-memory-leaks?forum=vcgeneral#53f0cc89-62fe-45e8-bbf0-56b89f2a1901
// This causes MSVC Debug runs to produce a report upon program exit, that contains memory-leaks
// together with the file:line information about where the memory was allocated.
// Note that this doesn't work with placement-new, which needs to temporarily #undef the macro
// (See AllocationPool.h for an example).
#ifdef _DEBUG
#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#define DEBUG_CLIENTBLOCK new(_CLIENT_BLOCK, __FILE__, __LINE__)
#define new DEBUG_CLIENTBLOCK
// For some reason this works magically - each "new X" gets replaced as "new(_CLIENT_BLOCK, "file", line) X"
// The CRT has a definition for this operator new that stores the debugging info for leak-finding later.
#endif
#endif
#elif defined(__GNUC__)
// TODO: Can GCC explicitly mark classes as abstract (no instances can be created)?