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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/log/backtrace3.c
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@ -51,10 +51,9 @@ dontinstrument dontasan int PrintBacktraceUsingSymbols(
size_t gi;
intptr_t addr;
const char *name;
char cxxbuf[3000];
int i, symbol, addend;
static char cxxbuf[8192];
struct Garbages *garbage;
static pthread_spinlock_t lock;
const struct StackFrame *frame;
(void)gi;
if (!bp)
@ -92,10 +91,8 @@ dontinstrument dontasan int PrintBacktraceUsingSymbols(
addend = 0;
}
if ((name = __get_symbol_name(st, symbol)) && __is_mangled(name)) {
pthread_spin_lock(&lock);
__demangle(cxxbuf, name, sizeof(cxxbuf));
kprintf("%012lx %lx %s%+d\n", frame, addr, cxxbuf, addend);
pthread_spin_unlock(&lock);
name = cxxbuf;
} else {
kprintf("%012lx %lx %s%+d\n", frame, addr, name, addend);