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How to get current stack size ?
- From: Igor Bukanov <igor at icesoft dot no>
- To: gcc at gnu dot org
- Date: Thu, 20 Feb 2003 02:41:28 +0100
- Subject: How to get current stack size ?
Hi!
Is there any internal function in GCC that I can use to determine
currently consumed stack space? Or I should better ask glibc guys about it?
I would like to prevent too deep recursion in a recursive descent parser
which parse external data and limiting amount of stack space that can be
consumed during recursion seems to be a simple solution. Initially I
thought to use something like the following scheme which calculates
address differences:
char* stack_mark;
void parse() {
char dummy;
stack_mark = &dummy;
...
recursively_called_function();
....
}
void recursively_called_function() {
char dummy;
ptrdiff_t consumed_stack_size = &dummy - stack_mark;
if (consumed_stack_size > STACK_LIMIT
|| -consumed_stack_size > STACK_LIMIT)
{
report_error();
}
...
}
The trouble is that parse() can be called from some other libraries that
may also be under deep recursion and checking against stack size
consumed during parse may miss stack overflow. So I need absolute value
for the stack size.
Thanks in advance, Igor Bukanov