Subj : Re: call stack
To   : borland.public.cpp.borlandcpp
From : Bob Gonder
Date : Tue Dec 21 2004 08:34 am

Jeff Kish wrote:

>On Mon, 20 Dec 2004 14:00:30 -0800, Bob Gonder
>
>>Jeff Kish wrote:
>>
>>>Yes, I am running Borland 5.02 with OWL.
>>>
>>>Is there some way (easy I hope) to get the call stack if I build with
>>>debug, and display it somewhere like a messagebox, or a log file?
>>
>>I don't see a function to help with that, but it shouldn't be hard.
>>To help you see every function, turn on Standard Stack Frame option.
>>
>>The basic functionality (in 32bit Windows code) would be like this:
>>(written off-the-cuff, so may be some tweaks needed)
>>	First, for reference: How a StackFrame is contructed:
>>
>>FunctionEntryPoint:
>>	push	ebp
>>	mov	ebp,esp
>>	sub	esp,16	;16 bytes local variables
>>	other code
>>	mov	esp,ebp
>>	pop	ebp
>>	ret
>>
>>How to walk the stack:
>>
>>	DWORD * pointer;
>>	DWORD	return_address;
>>	asm	mov	[pointer],ebp;
>>Again:
>>	asm{
>>		mov	eax,[pointer]
>>		mov	edx,[eax+4]
>>		mov	[return_address],edx
>>		mov	eax,[eax]
>>		mov	[pointer],eax
>>	};
>>	printf the return address
>>	if( you_want_more_data )
>>		goto Again;
>>
>>
>Thanks.
>So Bob, I need to embed a small amount of assembly code into the c++
>code? Does that mean I need the assembler product?

I would think 5.02 came with it.
But, we could rewrite it closer to C, I think wouldn't need the tasm.

typedef struct	tsf{
DWORD	next;
DWORD	ret;
}STACKFRAME,*LPSTACKFRAME;

void walk_the_stack(int depth)
{	LPSTACKFRAME	sf;
	sf = (LPSTACKFRAME)_EBP;
>>	asm	mov	[pointer],ebp;
>>Again:
	while(depth--)
	{
>>	asm{
>>		mov	eax,[pointer]
>>		mov	edx,[eax+4]
>>		mov	[return_address],edx
>>		mov	eax,[eax]
>>		mov	[pointer],eax
		sf = sf->next;
>>	};
>>	printf the return address
		printf( "The return address is %p\r\n", sf->ret);
/* put the printf here if you don't want to include the call to this
function., otherwise put it right after the while().*/
>>	if( you_want_more_data )
>>		goto Again;
	};
}

.