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//===-- sanitizer_symbolizer_libbacktrace.cpp -----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
// Libbacktrace implementation of symbolizer parts.
//===----------------------------------------------------------------------===//
#include "sanitizer_symbolizer_libbacktrace.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_platform.h"
#include "sanitizer_symbolizer.h"
#if SANITIZER_LIBBACKTRACE
# error #include "backtrace-supported.h"
# if SANITIZER_POSIX && BACKTRACE_SUPPORTED && !BACKTRACE_USES_MALLOC
# error #include "backtrace.h"
# if SANITIZER_CP_DEMANGLE
# undef ARRAY_SIZE
# error #include "demangle.h"
# endif
# else
# define SANITIZER_LIBBACKTRACE 0
# endif
#endif
namespace __sanitizer {
static char *DemangleAlloc(const char *name, bool always_alloc);
#if SANITIZER_LIBBACKTRACE
namespace {
# if SANITIZER_CP_DEMANGLE
struct CplusV3DemangleData {
char *buf;
uptr size, allocated;
};
extern "C" {
static void CplusV3DemangleCallback(const char *s, size_t l, void *vdata) {
CplusV3DemangleData *data = (CplusV3DemangleData *)vdata;
uptr needed = data->size + l + 1;
if (needed > data->allocated) {
data->allocated *= 2;
if (needed > data->allocated)
data->allocated = needed;
char *buf = (char *)InternalAlloc(data->allocated);
if (data->buf) {
internal_memcpy(buf, data->buf, data->size);
InternalFree(data->buf);
}
data->buf = buf;
}
internal_memcpy(data->buf + data->size, s, l);
data->buf[data->size + l] = '\0';
data->size += l;
}
} // extern "C"
char *CplusV3Demangle(const char *name) {
CplusV3DemangleData data;
data.buf = 0;
data.size = 0;
data.allocated = 0;
if (cplus_demangle_v3_callback(name, DMGL_PARAMS | DMGL_ANSI,
CplusV3DemangleCallback, &data)) {
if (data.size + 64 > data.allocated)
return data.buf;
char *buf = internal_strdup(data.buf);
InternalFree(data.buf);
return buf;
}
if (data.buf)
InternalFree(data.buf);
return 0;
}
# endif // SANITIZER_CP_DEMANGLE
struct SymbolizeCodeCallbackArg {
SymbolizedStack *first;
SymbolizedStack *last;
uptr frames_symbolized;
AddressInfo *get_new_frame(uintptr_t addr) {
CHECK(last);
if (frames_symbolized > 0) {
SymbolizedStack *cur = SymbolizedStack::New(addr);
AddressInfo *info = &cur->info;
info->FillModuleInfo(first->info.module, first->info.module_offset,
first->info.module_arch);
last->next = cur;
last = cur;
}
CHECK_EQ(addr, first->info.address);
CHECK_EQ(addr, last->info.address);
return &last->info;
}
};
extern "C" {
static int SymbolizeCodePCInfoCallback(void *vdata, uintptr_t addr,
const char *filename, int lineno,
const char *function) {
SymbolizeCodeCallbackArg *cdata = (SymbolizeCodeCallbackArg *)vdata;
if (function) {
AddressInfo *info = cdata->get_new_frame(addr);
info->function = DemangleAlloc(function, /*always_alloc*/ true);
if (filename)
info->file = internal_strdup(filename);
info->line = lineno;
cdata->frames_symbolized++;
}
return 0;
}
static void SymbolizeCodeCallback(void *vdata, uintptr_t addr,
const char *symname, uintptr_t, uintptr_t) {
SymbolizeCodeCallbackArg *cdata = (SymbolizeCodeCallbackArg *)vdata;
if (symname) {
AddressInfo *info = cdata->get_new_frame(addr);
info->function = DemangleAlloc(symname, /*always_alloc*/ true);
cdata->frames_symbolized++;
}
}
static void SymbolizeDataCallback(void *vdata, uintptr_t, const char *symname,
uintptr_t symval, uintptr_t symsize) {
DataInfo *info = (DataInfo *)vdata;
if (symname && symval) {
info->name = DemangleAlloc(symname, /*always_alloc*/ true);
info->start = symval;
info->size = symsize;
}
}
static void ErrorCallback(void *, const char *, int) {}
} // extern "C"
} // namespace
LibbacktraceSymbolizer *LibbacktraceSymbolizer::get(LowLevelAllocator *alloc) {
// State created in backtrace_create_state is leaked.
void *state = (void *)(backtrace_create_state("/proc/self/exe", 0,
ErrorCallback, NULL));
if (!state)
return 0;
return new(*alloc) LibbacktraceSymbolizer(state);
}
bool LibbacktraceSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
SymbolizeCodeCallbackArg data;
data.first = stack;
data.last = stack;
data.frames_symbolized = 0;
backtrace_pcinfo((backtrace_state *)state_, addr, SymbolizeCodePCInfoCallback,
ErrorCallback, &data);
if (data.frames_symbolized > 0)
return true;
backtrace_syminfo((backtrace_state *)state_, addr, SymbolizeCodeCallback,
ErrorCallback, &data);
return (data.frames_symbolized > 0);
}
bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
backtrace_syminfo((backtrace_state *)state_, addr, SymbolizeDataCallback,
ErrorCallback, info);
return true;
}
#else // SANITIZER_LIBBACKTRACE
LibbacktraceSymbolizer *LibbacktraceSymbolizer::get(LowLevelAllocator *alloc) {
return 0;
}
bool LibbacktraceSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
(void)state_;
return false;
}
bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
return false;
}
#endif // SANITIZER_LIBBACKTRACE
static char *DemangleAlloc(const char *name, bool always_alloc) {
#if SANITIZER_LIBBACKTRACE && SANITIZER_CP_DEMANGLE
if (char *demangled = CplusV3Demangle(name))
return demangled;
#endif
if (always_alloc)
return internal_strdup(name);
return nullptr;
}
const char *LibbacktraceSymbolizer::Demangle(const char *name) {
return DemangleAlloc(name, /*always_alloc*/ false);
}
} // namespace __sanitizer
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