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_ReturnAddress

Microsoft Specific

The _ReturnAddress intrinsic provides the address of the instruction in the calling function that will be executed after control returns to the caller.

Build the following program and step through it in the debugger. As you step through the program, note the address that is returned from _ReturnAddress. Then, immediately after returning from the function where _ReturnAddress was used, open the Disassembly window and note that the address of the next instruction to be executed matches the address returned from _ReturnAddress.

Optimizations such as inlining may affect the return address. For example, if the sample program below is compiled with /Ob1, inline_func will be inlined into the calling function, main. Therefore, the calls to _ReturnAddress from inline_func and main will each produce the same value.

When _ReturnAddress is used in a program compiled with /clr, the function containing the _ReturnAddress call will be compiled as a native function. When a function compiled as a managed calls into the function containing _ReturnAddress, _ReturnAddress may not behave as expected.

// compiler_intrinsics__ReturnAddress.cpp
#include <stdio.h>
// _ReturnAddress should be prototyped before use 
#ifdef __cplusplus
extern "C"
#endif
void * _ReturnAddress(void);

#pragma intrinsic(_ReturnAddress)

__declspec(noinline)
void noinline_func(void)
{
   printf("Return address from %s: %p\n", __FUNCTION__, _ReturnAddress());
}

__forceinline
void inline_func(void)
{
   printf("Return address from %s: %p\n", __FUNCTION__, _ReturnAddress());
}

int main(void)
{
   noinline_func(); 
   inline_func();
   printf("Return address from %s: %p\n", __FUNCTION__, _ReturnAddress());

   return 0;
}

END Microsoft Specific

See Also

Compiler Intrinsics | C++ Keywords

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