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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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GPG key ID: BE714B4575D6E328
11 changed files with 118 additions and 24 deletions
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6
tool/cosmocc/bin/cosmocc
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@ -162,7 +162,7 @@ for x; do
# tail calls — may opt not to create an entry in this list. As a
# result, stack traces are always meaningful, even without debug
# information."
x="-momit-leaf-frame-pointer -foptimize-sibling-calls"
x="-momit-leaf-frame-pointer -foptimize-sibling-calls -fschedule-insns2"
elif [ x"$x" = x"-r" ] ||
[ x"$x" = x"-S" ] ||
[ x"$x" = x"-pie" ] ||
@ -241,9 +241,13 @@ CFLAGS="-fportcosmo -fno-dwarf2-cfi-asm -fno-unwind-tables -fno-asynchronous-unw
LDFLAGS="-static -nostdlib -no-pie -fuse-ld=bfd -Wl,-z,noexecstack -Wl,-z,norelro -Wl,--gc-sections"
PRECIOUS="-fno-omit-frame-pointer"
# these features screw with backtraces so avoid them
if [ x"$OPT" != x"-Os" ] && [ x"$MODE" != x"tiny" ]; then
CFLAGS="$CFLAGS -fno-optimize-sibling-calls -mno-omit-leaf-frame-pointer"
fi
if [ x"$OPT" != x"-O3" ]; then
CFLAGS="$CFLAGS -fno-schedule-insns2"
fi
CC_X86_64="$BIN/x86_64-linux-cosmo-gcc"
CC_AARCH64="$BIN/aarch64-linux-cosmo-gcc"

3
tool/cosmocc/bin/cosmocross
View file

@ -200,6 +200,9 @@ if [ x"$OPT" != x"-Os" ] && # $OPT != "-Os"
[ x"$MODE" != x"${MODE%tiny}" ]; then # endswith($MODE, "tiny")
CFLAGS="$CFLAGS -fno-optimize-sibling-calls -mno-omit-leaf-frame-pointer"
fi
if [ x"$OPT" != x"-O3" ]; then
CFLAGS="$CFLAGS -fno-schedule-insns2"
fi
if [ $INTENT = cpp ]; then
set -- "$CC" $PLATFORM $CPPFLAGS "$@"