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IDiaFrameData::get_program

  • Article

Retrieves the program string that is used to compute the register set before the call to the current function.

Syntax

HRESULT get_program ( 
   BSTR* pRetVal
);

Parameters

pRetVal

[out] Returns the program string.

Return Value

If successful, returns S_OK. Returns S_FALSE if this property is not supported. Otherwise, returns an error code.

Remarks

The program string is a sequence of macros that is interpreted in order to establish the prologue. For example, a typical stack frame might use the program string "$T0 $ebp = $eip $T0 4 + ^ = $ebp $T0 ^ = $esp $T0 8 + =". The format is reverse polish notation, where the operators follow the operands. T0 represents a temporary variable on the stack. This example performs the following steps:

  1. Move contents of register ebp to T0.

  2. Add 4 to the value in T0 to produce an address, get the value from that address, and store the value in register eip.

  3. Get the value from the address stored in T0 and store that value in register ebp.

  4. Add 8 to the value in T0 and store that value in register esp.

    Note that the program string is specific to the CPU and to the calling convention set up for the function represented by the current stack frame.

See also