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libbacktrace: use ELF symbol table if no debug info available

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PR libbacktrace/97080
	* fileline.c (backtrace_syminfo_to_full_callback): New function.
	(backtrace_syminfo_to_full_error_callback): New function.
	* elf.c (elf_nodebug): Call syminfo_fn if possible.
	* internal.h (struct backtrace_call_full): Define.
	(backtrace_syminfo_to_full_callback): Declare.
	(backtrace_syminfo_to_full_error_callback): Declare.
	* mtest.c (f3): Only check all[i] if data.index permits.
This commit is contained in:
Ian Lance Taylor
2020-09-16 17:03:52 -07:00
parent 753968c2e8
commit c8a81d4e3a
4 changed files with 115 additions and 39 deletions
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39
elf.c
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@@ -547,18 +547,6 @@ elf_crc32_file (struct backtrace_state *state, int descriptor,
return ret;
}
/* A dummy callback function used when we can't find any debug info. */
static int
elf_nodebug (struct backtrace_state *state ATTRIBUTE_UNUSED,
uintptr_t pc ATTRIBUTE_UNUSED,
backtrace_full_callback callback ATTRIBUTE_UNUSED,
backtrace_error_callback error_callback, void *data)
{
error_callback (data, "no debug info in ELF executable", -1);
return 0;
}
/* A dummy callback function used when we can't find a symbol
table. */
@@ -571,6 +559,33 @@ elf_nosyms (struct backtrace_state *state ATTRIBUTE_UNUSED,
error_callback (data, "no symbol table in ELF executable", -1);
}
/* A callback function used when we can't find any debug info. */
static int
elf_nodebug (struct backtrace_state *state, uintptr_t pc,
backtrace_full_callback callback,
backtrace_error_callback error_callback, void *data)
{
if (state->syminfo_fn != NULL && state->syminfo_fn != elf_nosyms)
{
struct backtrace_call_full bdata;
/* Fetch symbol information so that we can least get the
function name. */
bdata.full_callback = callback;
bdata.full_error_callback = error_callback;
bdata.full_data = data;
bdata.ret = 0;
state->syminfo_fn (state, pc, backtrace_syminfo_to_full_callback,
backtrace_syminfo_to_full_error_callback, &bdata);
return bdata.ret;
}
error_callback (data, "no debug info in ELF executable", -1);
return 0;
}
/* Compare struct elf_symbol for qsort. */
static int