ef42295fe8
This makes it possible to get backtraces with executables
(including DLLs/SOs) like we had it already with -g -run.
Option -b includes -bt, and -bt includes -g.
- new file lib/bt-exe.c: used to link rt_printline and the
exception handler from tccrun.c into executables/DLLs.
- new file lib/bt-log.c: provides a function that may be
called from user code to print out a backtrace with a
message (currently for i386/x86_64 only):
int (*tcc_backtrace)(const char *fmt, ...);
As an extra hack, if 'fmt' is prefixed like "^file.c^..."
then the backtrace will skip calls from within 'file.c'.
- new file lib/bt-dll.c: used on win32 to link the backtrace
and bcheck functions with the main module at runtime
- bcheck.c: now uses the tcc_backtrace function from above
- tccgen.c: minor cleanups
- tccelf.c: stab sections get SHF_ALLOC for easy access.
Also in relocate_section(): 64bit relocations for stabs
in DLLs cannot work. To find DLL addresses, the DLL base
is added manually in tccrun.c via rc.prog_base instead.
- tccpe.c: there are some changes to allow merging sections,
used to merge .finit_array into .data in the first place.
- tccpp.c: tcc -run now #defines __TCC_RUN__
also: refactor a line in tal_realloc that was incompatible
with bcheck
- tcctest.c: fixed a problem with r12 which tcc cannot preserve
as well as gcc does.
- tests2/112_backtrace.c: test the feature and the bcheck test18
that previously was in boundtest.c
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/* ------------------------------------------------------------- */
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/* for linking rt_printline and the signal/exception handler
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from tccrun.c into executables. */
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#define CONFIG_TCC_BACKTRACE_ONLY
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#include "../tccrun.c"
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int (*__rt_error)(void*, void*, const char *, va_list);
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#ifndef _WIN32
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# define __declspec(n)
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#endif
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__declspec(dllexport)
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void __bt_init(rt_context *p, int num_callers)
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{
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__attribute__((weak)) int main();
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__attribute__((weak)) void __bound_init(void*);
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struct rt_context *rc = &g_rtctxt;
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//fprintf(stderr, "__bt_init %d %p %p\n", num_callers, p->stab_sym, p->bounds_start), fflush(stderr);
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if (num_callers) {
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memcpy(rc, p, offsetof(rt_context, next));
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rc->num_callers = num_callers - 1;
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rc->top_func = main;
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__rt_error = _rt_error;
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set_exception_handler();
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} else {
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p->next = rc->next, rc->next = p;
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}
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if (__bound_init && p->bounds_start)
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__bound_init(p->bounds_start);
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}
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/* copy a string and truncate it. */
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static char *pstrcpy(char *buf, size_t buf_size, const char *s)
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{
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int l = strlen(s);
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if (l >= buf_size)
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l = buf_size - 1;
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memcpy(buf, s, l);
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buf[l] = 0;
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return buf;
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}
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