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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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5
libc/intrin/asan.c
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@ -1136,10 +1136,7 @@ int __asan_print_trace(void *p) {
kprintf(" (shadow not mapped?!)");
}
for (i = 0; i < ARRAYLEN(e->bt.p) && e->bt.p[i]; ++i) {
kprintf("\n%*lx %s", 12, e->bt.p[i],
_weaken(GetSymbolByAddr)
? _weaken(GetSymbolByAddr)(e->bt.p[i])
: "please __static_yoink(\"GetSymbolByAddr\")");
kprintf("\n%*lx %t", 12, e->bt.p[i], e->bt.p[i]);
}
return 0;
}