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Full Discussion: C function call dynamically
Top Forums Programming C function call dynamically Post 302379363 by Corona688 on Thursday 10th of December 2009 01:15:26 PM
Old 12-10-2009
Quote:
Originally Posted by DreamWarrior
I think the short answer is no. As far as I know, there is no way in C to dynamically control the call stack.
I've seen it done, like you say, in inline ASM. Very hairy ASM that's specific to carefully controlled circumstances under one configuration of one compiler of one version of one architecture. I tried building one myself, and quickly gave up when I spotted the optimizer stuffing arguments into registers instead of stack whenever it felt like it.

It should really be up to the one thing that really knows how function calls work at all times -- the compiler, plus macros in stdargs. It's one of the few severely un-orthogonal things left in C but there's obscure reasons this isn't possible on a few strange architectures, ergo it's not going to happen.
 

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STACK(9)						   BSD Kernel Developer's Manual						  STACK(9)

NAME
STACK -- stack macros SYNOPSIS
#include <sys/param.h> type STACK_ALLOC(sp, size); type STACK_MAX(sp, size); type STACK_ALIGN(sp, bytes); type STACK_GROW(sp, size); type STACK_SHRINK(sp, size); DESCRIPTION
A stack is an area of memory with a fixed origin but with a variable size. A stack pointer points to the most recently referenced location on the stack. Initially, when the stack has a size of zero, the stack pointer points to the origin of the stack. When data items are added to the stack, the stack pointer moves away from the origin. The STACK_ALLOC() macro returns a pointer to allocated stack space of some size. Given the returned pointer sp and size, STACK_MAX() returns the maximum stack address of the allocated stack space. The STACK_ALIGN() macro can be used to align the stack pointer sp by the specified amount of bytes. Two basic operations are common to all stacks: a data item is added (``push'') to the location pointed by sp or a data item is removed (``pop'') from the stack. The stack pointer must be subsequently adjusted by the size of the data item. The STACK_GROW() and STACK_SHRINK() macros adjust the stack pointer sp by given size. A stack may grow either up or down. The described macros take this into account by using the __MACHINE_STACK_GROWS_UP preprocessor define. SEE ALSO
param(3), queue(3) BSD
April 8, 2011 BSD
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