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llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.cc

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//===-- sanitizer_symbolizer.cc -------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// 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. See sanitizer_symbolizer.h for details.
//===----------------------------------------------------------------------===//
#include "sanitizer_common.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_procmaps.h"
#include "sanitizer_symbolizer.h"
namespace __sanitizer {
void AddressInfo::Clear() {
InternalFree(module);
InternalFree(function);
InternalFree(file);
internal_memset(this, 0, sizeof(AddressInfo));
}
LoadedModule::LoadedModule(const char *module_name, uptr base_address) {
full_name_ = internal_strdup(module_name);
base_address_ = base_address;
n_ranges_ = 0;
}
void LoadedModule::addAddressRange(uptr beg, uptr end) {
CHECK_LT(n_ranges_, kMaxNumberOfAddressRanges);
ranges_[n_ranges_].beg = beg;
ranges_[n_ranges_].end = end;
n_ranges_++;
}
bool LoadedModule::containsAddress(uptr address) const {
for (uptr i = 0; i < n_ranges_; i++) {
if (ranges_[i].beg <= address && address < ranges_[i].end)
return true;
}
return false;
}
// Extracts the prefix of "str" that consists of any characters not
// present in "delims" string, and copies this prefix to "result", allocating
// space for it.
// Returns a pointer to "str" after skipping extracted prefix and first
// delimiter char.
static const char *ExtractToken(const char *str, const char *delims,
char **result) {
uptr prefix_len = internal_strcspn(str, delims);
*result = (char*)InternalAlloc(prefix_len + 1);
internal_memcpy(*result, str, prefix_len);
(*result)[prefix_len] = '\0';
const char *prefix_end = str + prefix_len;
if (*prefix_end != '\0') prefix_end++;
return prefix_end;
}
// Same as ExtractToken, but converts extracted token to integer.
static const char *ExtractInt(const char *str, const char *delims,
int *result) {
char *buff;
const char *ret = ExtractToken(str, delims, &buff);
if (buff != 0) {
*result = (int)internal_atoll(buff);
}
InternalFree(buff);
return ret;
}
static const char *ExtractUptr(const char *str, const char *delims,
uptr *result) {
char *buff;
const char *ret = ExtractToken(str, delims, &buff);
if (buff != 0) {
*result = (uptr)internal_atoll(buff);
}
InternalFree(buff);
return ret;
}
// ExternalSymbolizer encapsulates communication between the tool and
// external symbolizer program, running in a different subprocess,
// For now we assume the following protocol:
// For each request of the form
// <module_name> <module_offset>
// passed to STDIN, external symbolizer prints to STDOUT response:
// <function_name>
// <file_name>:<line_number>:<column_number>
// <function_name>
// <file_name>:<line_number>:<column_number>
// ...
// <empty line>
class ExternalSymbolizer {
public:
ExternalSymbolizer(const char *path, int input_fd, int output_fd)
: path_(path),
input_fd_(input_fd),
output_fd_(output_fd),
times_restarted_(0) {
CHECK(path_);
CHECK_NE(input_fd_, kInvalidFd);
CHECK_NE(output_fd_, kInvalidFd);
}
char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
CHECK(module_name);
internal_snprintf(buffer_, kBufferSize, "%s%s 0x%zx\n",
is_data ? "DATA " : "", module_name, module_offset);
if (!writeToSymbolizer(buffer_, internal_strlen(buffer_)))
return 0;
if (!readFromSymbolizer(buffer_, kBufferSize))
return 0;
return buffer_;
}
bool Restart() {
if (times_restarted_ >= kMaxTimesRestarted) return false;
times_restarted_++;
internal_close(input_fd_);
internal_close(output_fd_);
return StartSymbolizerSubprocess(path_, &input_fd_, &output_fd_);
}
private:
bool readFromSymbolizer(char *buffer, uptr max_length) {
if (max_length == 0)
return true;
uptr read_len = 0;
while (true) {
uptr just_read = internal_read(input_fd_, buffer + read_len,
max_length - read_len);
// We can't read 0 bytes, as we don't expect external symbolizer to close
// its stdout.
if (just_read == 0 || just_read == (uptr)-1) {
Report("WARNING: Can't read from symbolizer at fd %d\n", input_fd_);
return false;
}
read_len += just_read;
// Empty line marks the end of symbolizer output.
if (read_len >= 2 && buffer[read_len - 1] == '\n' &&
buffer[read_len - 2] == '\n') {
break;
}
}
return true;
}
bool writeToSymbolizer(const char *buffer, uptr length) {
if (length == 0)
return true;
uptr write_len = internal_write(output_fd_, buffer, length);
if (write_len == 0 || write_len == (uptr)-1) {
Report("WARNING: Can't write to symbolizer at fd %d\n", output_fd_);
return false;
}
return true;
}
const char *path_;
int input_fd_;
int output_fd_;
static const uptr kBufferSize = 16 * 1024;
char buffer_[kBufferSize];
static const uptr kMaxTimesRestarted = 5;
uptr times_restarted_;
};
static LowLevelAllocator symbolizer_allocator; // Linker initialized.
#if SANITIZER_SUPPORTS_WEAK_HOOKS
extern "C" {
SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
bool __sanitizer_symbolize_code(const char *ModuleName, u64 ModuleOffset,
char *Buffer, int MaxLength);
SANITIZER_WEAK_ATTRIBUTE SANITIZER_INTERFACE_ATTRIBUTE
bool __sanitizer_symbolize_data(const char *ModuleName, u64 ModuleOffset,
char *Buffer, int MaxLength);
} // extern "C"
class InternalSymbolizer {
public:
typedef bool (*SanitizerSymbolizeFn)(const char*, u64, char*, int);
static InternalSymbolizer *get() {
if (__sanitizer_symbolize_code != 0 &&
__sanitizer_symbolize_data != 0) {
void *mem = symbolizer_allocator.Allocate(sizeof(InternalSymbolizer));
return new(mem) InternalSymbolizer();
}
return 0;
}
char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
SanitizerSymbolizeFn symbolize_fn = is_data ? __sanitizer_symbolize_data
: __sanitizer_symbolize_code;
if (symbolize_fn(module_name, module_offset, buffer_, kBufferSize))
return buffer_;
return 0;
}
private:
InternalSymbolizer() { }
static const int kBufferSize = 16 * 1024;
char buffer_[kBufferSize];
};
#else // SANITIZER_SUPPORTS_WEAK_HOOKS
class InternalSymbolizer {
public:
static InternalSymbolizer *get() { return 0; }
char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
return 0;
}
};
#endif // SANITIZER_SUPPORTS_WEAK_HOOKS
class Symbolizer {
public:
uptr SymbolizeCode(uptr addr, AddressInfo *frames, uptr max_frames) {
if (max_frames == 0)
return 0;
LoadedModule *module = FindModuleForAddress(addr);
if (module == 0)
return 0;
const char *module_name = module->full_name();
uptr module_offset = addr - module->base_address();
const char *str = SendCommand(false, module_name, module_offset);
if (str == 0) {
// External symbolizer was not initialized or failed. Fill only data
// about module name and offset.
AddressInfo *info = &frames[0];
info->Clear();
info->FillAddressAndModuleInfo(addr, module_name, module_offset);
return 1;
}
uptr frame_id = 0;
for (frame_id = 0; frame_id < max_frames; frame_id++) {
AddressInfo *info = &frames[frame_id];
char *function_name = 0;
str = ExtractToken(str, "\n", &function_name);
CHECK(function_name);
if (function_name[0] == '\0') {
// There are no more frames.
break;
}
info->Clear();
info->FillAddressAndModuleInfo(addr, module_name, module_offset);
info->function = function_name;
// Parse <file>:<line>:<column> buffer.
char *file_line_info = 0;
str = ExtractToken(str, "\n", &file_line_info);
CHECK(file_line_info);
const char *line_info = ExtractToken(file_line_info, ":", &info->file);
line_info = ExtractInt(line_info, ":", &info->line);
line_info = ExtractInt(line_info, "", &info->column);
InternalFree(file_line_info);
// Functions and filenames can be "??", in which case we write 0
// to address info to mark that names are unknown.
if (0 == internal_strcmp(info->function, "??")) {
InternalFree(info->function);
info->function = 0;
}
if (0 == internal_strcmp(info->file, "??")) {
InternalFree(info->file);
info->file = 0;
}
}
if (frame_id == 0) {
// Make sure we return at least one frame.
AddressInfo *info = &frames[0];
info->Clear();
info->FillAddressAndModuleInfo(addr, module_name, module_offset);
frame_id = 1;
}
return frame_id;
}
bool SymbolizeData(uptr addr, DataInfo *info) {
LoadedModule *module = FindModuleForAddress(addr);
if (module == 0)
return false;
const char *module_name = module->full_name();
uptr module_offset = addr - module->base_address();
internal_memset(info, 0, sizeof(*info));
info->address = addr;
info->module = internal_strdup(module_name);
info->module_offset = module_offset;
const char *str = SendCommand(true, module_name, module_offset);
if (str == 0)
return true;
str = ExtractToken(str, "\n", &info->name);
str = ExtractUptr(str, " ", &info->start);
str = ExtractUptr(str, "\n", &info->size);
info->start += module->base_address();
return true;
}
bool InitializeExternalSymbolizer(const char *path_to_symbolizer) {
int input_fd, output_fd;
if (!StartSymbolizerSubprocess(path_to_symbolizer, &input_fd, &output_fd))
return false;
void *mem = symbolizer_allocator.Allocate(sizeof(ExternalSymbolizer));
external_symbolizer_ = new(mem) ExternalSymbolizer(path_to_symbolizer,
input_fd, output_fd);
return true;
}
bool IsSymbolizerAvailable() {
if (internal_symbolizer_ == 0)
internal_symbolizer_ = InternalSymbolizer::get();
return internal_symbolizer_ || external_symbolizer_;
}
private:
char *SendCommand(bool is_data, const char *module_name, uptr module_offset) {
// First, try to use internal symbolizer.
if (internal_symbolizer_ == 0) {
internal_symbolizer_ = InternalSymbolizer::get();
}
if (internal_symbolizer_) {
return internal_symbolizer_->SendCommand(is_data, module_name,
module_offset);
}
// Otherwise, fall back to external symbolizer.
if (external_symbolizer_ == 0) {
ReportExternalSymbolizerError(
"WARNING: Trying to symbolize code, but external "
"symbolizer is not initialized!\n");
return 0;
}
for (;;) {
char *reply = external_symbolizer_->SendCommand(is_data, module_name,
module_offset);
if (reply)
return reply;
// Try to restart symbolizer subprocess. If we don't succeed, forget
// about it and don't try to use it later.
if (!external_symbolizer_->Restart()) {
ReportExternalSymbolizerError(
"WARNING: Failed to use and restart external symbolizer!\n");
external_symbolizer_ = 0;
return 0;
}
}
}
LoadedModule *FindModuleForAddress(uptr address) {
if (modules_ == 0) {
modules_ = (LoadedModule*)(symbolizer_allocator.Allocate(
kMaxNumberOfModuleContexts * sizeof(LoadedModule)));
CHECK(modules_);
n_modules_ = GetListOfModules(modules_, kMaxNumberOfModuleContexts);
CHECK_GT(n_modules_, 0);
CHECK_LT(n_modules_, kMaxNumberOfModuleContexts);
}
for (uptr i = 0; i < n_modules_; i++) {
if (modules_[i].containsAddress(address)) {
return &modules_[i];
}
}
return 0;
}
void ReportExternalSymbolizerError(const char *msg) {
// Don't use atomics here for now, as SymbolizeCode can't be called
// from multiple threads anyway.
static bool reported;
if (!reported) {
Report(msg);
reported = true;
}
}
// 16K loaded modules should be enough for everyone.
static const uptr kMaxNumberOfModuleContexts = 1 << 14;
LoadedModule *modules_; // Array of module descriptions is leaked.
uptr n_modules_;
ExternalSymbolizer *external_symbolizer_; // Leaked.
InternalSymbolizer *internal_symbolizer_; // Leaked.
};
static Symbolizer symbolizer; // Linker initialized.
uptr SymbolizeCode(uptr address, AddressInfo *frames, uptr max_frames) {
return symbolizer.SymbolizeCode(address, frames, max_frames);
}
bool SymbolizeData(uptr address, DataInfo *info) {
return symbolizer.SymbolizeData(address, info);
}
bool InitializeExternalSymbolizer(const char *path_to_symbolizer) {
return symbolizer.InitializeExternalSymbolizer(path_to_symbolizer);
}
bool IsSymbolizerAvailable() {
return symbolizer.IsSymbolizerAvailable();
}
} // namespace __sanitizer
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