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Improve backtraces

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We're now able to rewind the instruction pointer in x86 backtraces. This
helps ensure addr2line cannot print information about unrelated adjacent
code. I've restored -fno-schedule-insns2 in most cases because it really
does cause unpredictable breakage for backtraces.
This commit is contained in:
Justine Tunney 2024-05-30 15:11:45 -07:00
parent cd672e251f
commit 9b6718ac99
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11 changed files with 118 additions and 24 deletions
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10
libc/intrin/iscall.internal.h Normal file
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#ifndef COSMOPOLITAN_LIBC_INTRIN_ISCALL_H_
#define COSMOPOLITAN_LIBC_INTRIN_ISCALL_H_
COSMOPOLITAN_C_START_
// returns true if `p` is preceded by x86 call instruction
// this is actually impossible to do but we'll do our best
int __is_call(const unsigned char *);
COSMOPOLITAN_C_END_
#endif /* COSMOPOLITAN_LIBC_INTRIN_ISCALL_H_ */