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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
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
13 changed files with 727 additions and 284 deletions
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5
test/libcxx/BUILD.mk
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@ -15,6 +15,7 @@ TEST_LIBCXX_DIRECTDEPS = \
LIBC_CALLS \
LIBC_INTRIN \
LIBC_LOG \
LIBC_MEM \
LIBC_NEXGEN32E \
LIBC_RUNTIME \
LIBC_STDIO \
@ -22,6 +23,8 @@ TEST_LIBCXX_DIRECTDEPS = \
LIBC_THREAD \
LIBC_TINYMATH \
THIRD_PARTY_LIBCXX \
THIRD_PARTY_LIBCXXABI \
THIRD_PARTY_LIBUNWIND \
THIRD_PARTY_OPENMP
TEST_LIBCXX_DEPS := \
@ -39,7 +42,7 @@ o/$(MODE)/test/libcxx/%.dbg: \
$(APE_NO_MODIFY_SELF)
@$(APELINK)
$(TEST_LIBCXX_OBJS): private CCFLAGS += -fexceptions -frtti
$(TEST_LIBCXX_OBJS): private OVERRIDE_CXXFLAGS += -fexceptions -frtti
o/$(MODE)/test/libcxx/openmp_test.o: private CXXFLAGS += -fopenmp
o/$(MODE)/test/libcxx/openmp_test.runs: private QUOTA += -C100

80
test/libcxx/cexception_test.cc Normal file
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@ -0,0 +1,80 @@
/*-*-mode:c++;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8-*-│
│ vi: set et ft=c++ ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2024 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/mem/alg.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
// this dontthrow keyword SHOULD break this test. it's probably passing
// because we're currently using SjLj exceptions. the day we can change
// things, remove `dontthrow` and this test will still be a useful help
extern "C" dontthrow void qsort_(void *, size_t, size_t,
int (*)(const void *,
const void *)) asm("qsort");
struct Resource {
char *p;
Resource() {
p = new char;
}
~Resource() {
delete p;
}
};
void Poke(char *p) {
*p = 1;
}
void (*pPoke)(char *) = Poke;
void Throw(void) {
throw 42;
}
void (*pThrow)(void) = Throw;
int cmp(const void *x, const void *y) {
Resource r;
pPoke(r.p);
if (*r.p)
pThrow();
exit(5);
}
int A[3] = {3, 2, 1};
int Work(void) {
Resource r;
pPoke(r.p);
qsort_(A, 3, sizeof(int), cmp);
return A[0];
}
int (*pWork)(void) = Work;
int main(int argc, char *argv[]) {
try {
Resource r;
if (pWork() != 1)
return 1;
pPoke(r.p);
if (r.p)
return 2;
} catch (int e) {
if (e != 42)
return 3;
}
CheckForMemoryLeaks();
}