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Breaking on C labels?
- From: Joel Brobecker <brobecker at adacore dot com>
- To: gdb at sourceware dot org
- Date: Thu, 25 Jan 2007 14:49:05 -0500
- Subject: Breaking on C labels?
Hello,
A customer asked us a question about the ability of breaking on labels
inside C code. Consider for instance:
void
procedure foo (void)
{
[...]
error_handler:
[...]
}
The customer asked if it was possible to break at the error_handler
label. We are helping them with finding alternative solutions, but
I still did a bit of researching...
I discovered without much surprise that DWARF does indeed have provision
for labels (DW_TAG_label). However, I also noticed that GCC already
generates the associated DIEs. We actually even process them. However,
all my attempts in trying to reference them from the debugger failed.
I tried "break error_handler", or more simply "p error_handler", etc.
Did we ever make any attempt in implementing this sort of functionality
in the past?
Looking at the source code, I found in new_symbol ():
case DW_TAG_label:
attr = dwarf2_attr (die, DW_AT_low_pc, cu);
if (attr)
{
SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
}
SYMBOL_CLASS (sym) = LOC_LABEL;
break;
So we setup the symbol, but we don't add to any of our symbol lists...
I am left wondering what it is that we'll be doing with this symbol.
Thanks,
--
Joel, curious