1 files changed, 38 insertions, 0 deletions
diff --git a/tier0/mem_helpers.h b/tier0/mem_helpers.h
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+++ b/tier0/mem_helpers.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef MEM_HELPERS_H
+#define MEM_HELPERS_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+// Normally, the runtime libraries like to mess with the memory returned by malloc(), 
+// which can create problems trying to repro bugs in debug builds or in the debugger.
+//
+// If the debugger is present, it initializes data to 0xbaadf00d, which makes floating
+// point numbers come out to about 0.1.
+//
+// If the debugger is not present, and it's a debug build, then you get 0xcdcdcdcd,
+// which is about 25 million.
+//
+// Otherwise, you get uninitialized memory.
+//
+// In here, we make sure the memory is either random garbage, or it's set to
+// 0xffeeffee, which casts to a NAN.
+extern bool g_bInitMemory;
+#define ApplyMemoryInitializations( pMem, nSize ) if ( !g_bInitMemory ) ; else { DoApplyMemoryInitializations( pMem, nSize ); }
+void DoApplyMemoryInitializations( void *pMem, int nSize );
+
+size_t CalcHeapUsed();
+
+// Call this to reserve the bottom 4 GB of memory in order to ensure that we will
+// get crashes if we put pointers in DWORDs or ints. This will be a NOP on some
+// platforms (Xbox 360, PS3, 32-bit Windows, etc.)
+void ReserveBottomMemory();
+
+#endif // MEM_HELPERS_H