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//===-- sanitizer_symbolizer_libbacktrace.cc ------------------------------===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
// Libbacktrace implementation of symbolizer parts.
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_symbolizer.h"
#include "sanitizer_symbolizer_libbacktrace.h"
#if SANITIZER_LIBBACKTRACE
# include "backtrace-supported.h"
# if SANITIZER_POSIX && BACKTRACE_SUPPORTED && !BACKTRACE_USES_MALLOC
# include "backtrace.h"
# if SANITIZER_CP_DEMANGLE
# undef ARRAY_SIZE
# include "demangle.h"
# endif
# else
# define SANITIZER_LIBBACKTRACE 0
# endif
#endif
namespace __sanitizer {
#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 SymbolizeCodeData {
AddressInfo *frames;
uptr n_frames;
uptr max_frames;
const char *module_name;
uptr module_offset;
};
extern "C" {
static int SymbolizeCodePCInfoCallback(void *vdata, uintptr_t addr,
const char *filename, int lineno,
const char *function) {
SymbolizeCodeData *cdata = (SymbolizeCodeData *)vdata;
if (function) {
AddressInfo *info = &cdata->frames[cdata->n_frames++];
info->Clear();
info->FillAddressAndModuleInfo(addr, cdata->module_name,
cdata->module_offset);
info->function = LibbacktraceSymbolizer::Demangle(function, true);
if (filename)
info->file = internal_strdup(filename);
info->line = lineno;
if (cdata->n_frames == cdata->max_frames)
return 1;
}
return 0;
}
static void SymbolizeCodeCallback(void *vdata, uintptr_t addr,
const char *symname, uintptr_t, uintptr_t) {
SymbolizeCodeData *cdata = (SymbolizeCodeData *)vdata;
if (symname) {
AddressInfo *info = &cdata->frames[0];
info->Clear();
info->FillAddressAndModuleInfo(addr, cdata->module_name,
cdata->module_offset);
info->function = LibbacktraceSymbolizer::Demangle(symname, true);
cdata->n_frames = 1;
}
}
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 = LibbacktraceSymbolizer::Demangle(symname, 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);
}
uptr LibbacktraceSymbolizer::SymbolizeCode(uptr addr, AddressInfo *frames,
uptr max_frames,
const char *module_name,
uptr module_offset) {
SymbolizeCodeData data;
data.frames = frames;
data.n_frames = 0;
data.max_frames = max_frames;
data.module_name = module_name;
data.module_offset = module_offset;
backtrace_pcinfo((backtrace_state *)state_, addr, SymbolizeCodePCInfoCallback,
ErrorCallback, &data);
if (data.n_frames)
return data.n_frames;
backtrace_syminfo((backtrace_state *)state_, addr, SymbolizeCodeCallback,
ErrorCallback, &data);
return data.n_frames;
}
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;
}
uptr LibbacktraceSymbolizer::SymbolizeCode(uptr addr, AddressInfo *frames,
uptr max_frames,
const char *module_name,
uptr module_offset) {
(void)state_;
return 0;
}
bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
return false;
}
#endif // SANITIZER_LIBBACKTRACE
char *LibbacktraceSymbolizer::Demangle(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 0;
}
} // namespace __sanitizer
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