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Add C++ demangling to privileged runtime

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Cosmo will now print C++ symbols correctly in --ftrace logs and
backtraces. Doing this required reducing the memory requirement
of the __demangle() function by 3x. This was accomplished using
16-bit indices and 16-bit malloc granularity. That puts a limit
on the longest symbol we can successfully decode, which I think
would be around 6553 characters long, given a 65536-byte buffer
This commit is contained in:
Justine Tunney 2024-06-01 19:57:32 -07:00
parent dcd626edf8
commit 165c6b37e2
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GPG key ID: BE714B4575D6E328
13 changed files with 727 additions and 284 deletions
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4
libc/str/BUILD.mk
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@ -100,6 +100,10 @@ $(LIBC_STR_A_OBJS): private \
-Wframe-larger-than=4096 \
-Walloca-larger-than=4096
o/$(MODE)/libc/str/demangle.o: private \
OVERRIDE_CFLAGS += \
-ffreestanding
LIBC_STR_LIBS = $(foreach x,$(LIBC_STR_ARTIFACTS),$($(x)))
LIBC_STR_SRCS = $(foreach x,$(LIBC_STR_ARTIFACTS),$($(x)_SRCS))
LIBC_STR_HDRS = $(foreach x,$(LIBC_STR_ARTIFACTS),$($(x)_HDRS))

4172
libc/str/demangle.c
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