bool BacktraceOffline::Unwind(size_t num_ignore_frames, ucontext_t* context) {
if (context == nullptr) {
BACK_LOGW("The context is needed for offline backtracing.");
return false;
}
context_ = context;
unw_addr_space_t addr_space = unw_create_addr_space(&accessors, 0);
unw_cursor_t cursor;
int ret = unw_init_remote(&cursor, addr_space, this);
if (ret != 0) {
BACK_LOGW("unw_init_remote failed %d", ret);
unw_destroy_addr_space(addr_space);
return false;
}
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
if (ret < 0) {
BACK_LOGW("Failed to read IP %d", ret);
break;
}
unw_word_t sp;
ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
if (ret < 0) {
BACK_LOGW("Failed to read SP %d", ret);
break;
}
if (num_ignore_frames == 0) {
frames_.resize(num_frames + 1);
backtrace_frame_data_t* frame = &frames_[num_frames];
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
if (num_frames > 0) {
backtrace_frame_data_t* prev = &frames_[num_frames - 1];
prev->stack_size = frame->sp - prev->sp;
}
frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
FillInMap(frame->pc, &frame->map);
num_frames++;
} else {
num_ignore_frames--;
}
ret = unw_step(&cursor);
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
unw_destroy_addr_space(addr_space);
context_ = nullptr;
return true;
}
bool BacktraceOffline::FindProcInfo(unw_addr_space_t addr_space, uint64_t ip,
unw_proc_info_t* proc_info, int need_unwind_info) {
backtrace_map_t map;
FillInMap(ip, &map);
if (!BacktraceMap::IsValid(map)) {
return false;
}
const std::string& filename = map.name;
DebugFrameInfo* debug_frame = GetDebugFrameInFile(filename);
if (debug_frame == nullptr) {
return false;
}
if (debug_frame->is_eh_frame) {
uint64_t ip_offset = ip - map.start + map.offset;
uint64_t ip_vaddr; // vaddr in the elf file.
bool result = FileOffsetToVaddr(debug_frame->eh_frame.program_headers, ip_offset, &ip_vaddr);
if (!result) {
return false;
}
// Calculate the addresses where .eh_frame_hdr and .eh_frame stay when the process was running.
eh_frame_hdr_space_.start = (ip - ip_vaddr) + debug_frame->eh_frame.eh_frame_hdr_vaddr;
eh_frame_hdr_space_.end =
eh_frame_hdr_space_.start + debug_frame->eh_frame.eh_frame_hdr_data.size();
eh_frame_hdr_space_.data = debug_frame->eh_frame.eh_frame_hdr_data.data();
eh_frame_space_.start = (ip - ip_vaddr) + debug_frame->eh_frame.eh_frame_vaddr;
eh_frame_space_.end = eh_frame_space_.start + debug_frame->eh_frame.eh_frame_data.size();
eh_frame_space_.data = debug_frame->eh_frame.eh_frame_data.data();
unw_dyn_info di;
memset(&di, '\0', sizeof(di));
di.start_ip = map.start;
di.end_ip = map.end;
di.format = UNW_INFO_FORMAT_REMOTE_TABLE;
di.u.rti.name_ptr = 0;
di.u.rti.segbase = eh_frame_hdr_space_.start;
di.u.rti.table_data =
eh_frame_hdr_space_.start + debug_frame->eh_frame.fde_table_offset_in_eh_frame_hdr;
di.u.rti.table_len = (eh_frame_hdr_space_.end - di.u.rti.table_data) / sizeof(unw_word_t);
int ret = dwarf_search_unwind_table(addr_space, ip, &di, proc_info, need_unwind_info, this);
return ret == 0;
}
eh_frame_hdr_space_.Clear();
eh_frame_space_.Clear();
unw_dyn_info_t di;
unw_word_t segbase = map.start - map.offset;
int found = dwarf_find_debug_frame(0, &di, ip, segbase, filename.c_str(), map.start, map.end);
if (found == 1) {
int ret = dwarf_search_unwind_table(addr_space, ip, &di, proc_info, need_unwind_info, this);
return ret == 0;
}
return false;
}
void CAAUMIDIMapManager::ReplaceAllMaps (AUParameterMIDIMapping* inMappings, UInt32 inNumMaps, AUBase &That)
{
mParameterMaps.clear();
for (unsigned int i = 0; i < inNumMaps; ++i) {
CAAUMIDIMap mapping(inMappings[i]);
FillInMap (mapping, That);
mParameterMaps.push_back (mapping);
}
std::sort(mParameterMaps.begin(),mParameterMaps.end(), CompareMIDIMap());
}
size_t BacktracePtrace::Read(uintptr_t addr, uint8_t* buffer, size_t bytes) {
#if defined(__APPLE__)
BACK_LOGW("MacOS does not support reading from another pid.");
return 0;
#else
backtrace_map_t map;
FillInMap(addr, &map);
if (!BacktraceMap::IsValid(map) || !(map.flags & PROT_READ)) {
return 0;
}
bytes = MIN(map.end - addr, bytes);
size_t bytes_read = 0;
word_t data_word;
size_t align_bytes = addr & (sizeof(word_t) - 1);
if (align_bytes != 0) {
if (!PtraceRead(Tid(), addr & ~(sizeof(word_t) - 1), &data_word)) {
return 0;
}
align_bytes = sizeof(word_t) - align_bytes;
memcpy(buffer, reinterpret_cast<uint8_t*>(&data_word) + sizeof(word_t) - align_bytes,
align_bytes);
addr += align_bytes;
buffer += align_bytes;
bytes -= align_bytes;
bytes_read += align_bytes;
}
size_t num_words = bytes / sizeof(word_t);
for (size_t i = 0; i < num_words; i++) {
if (!PtraceRead(Tid(), addr, &data_word)) {
return bytes_read;
}
memcpy(buffer, &data_word, sizeof(word_t));
buffer += sizeof(word_t);
addr += sizeof(word_t);
bytes_read += sizeof(word_t);
}
size_t left_over = bytes & (sizeof(word_t) - 1);
if (left_over) {
if (!PtraceRead(Tid(), addr, &data_word)) {
return bytes_read;
}
memcpy(buffer, &data_word, left_over);
bytes_read += left_over;
}
return bytes_read;
#endif
}
bool BacktracePtrace::ReadWord(uintptr_t ptr, word_t* out_value) {
#if defined(__APPLE__)
BACK_LOGW("MacOS does not support reading from another pid.");
return false;
#else
if (!VerifyReadWordArgs(ptr, out_value)) {
return false;
}
backtrace_map_t map;
FillInMap(ptr, &map);
if (!BacktraceMap::IsValid(map) || !(map.flags & PROT_READ)) {
return false;
}
return PtraceRead(Tid(), ptr, out_value);
#endif
}
OSStatus CAAUMIDIMapManager::SortedInsertToParamaterMaps (AUParameterMIDIMapping *maps, UInt32 inNumMaps, AUBase &That)
{
for (unsigned int i = 0; i < inNumMaps; ++i)
{
CAAUMIDIMap map(maps[i]);
FillInMap (map, That);
int idx = FindParameterIndex (maps[i]);
if (idx > -1)
mParameterMaps.erase(mParameterMaps.begin() + idx);
// least disruptive place to put this is at the end
mParameterMaps.push_back(map);
}
std::sort(mParameterMaps.begin(), mParameterMaps.end(), CompareMIDIMap());
return noErr;
}
bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) {
if (ucontext == nullptr) {
int ret = unw_getcontext(&context_);
if (ret < 0) {
BACK_LOGW("unw_getcontext failed %d", ret);
return false;
}
} else {
GetUnwContextFromUcontext(ucontext);
}
// The cursor structure is pretty large, do not put it on the stack.
std::unique_ptr<unw_cursor_t> cursor(new unw_cursor_t);
int ret = unw_init_local(cursor.get(), &context_);
if (ret < 0) {
BACK_LOGW("unw_init_local failed %d", ret);
return false;
}
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(cursor.get(), UNW_REG_IP, &pc);
if (ret < 0) {
BACK_LOGW("Failed to read IP %d", ret);
break;
}
unw_word_t sp;
ret = unw_get_reg(cursor.get(), UNW_REG_SP, &sp);
if (ret < 0) {
BACK_LOGW("Failed to read SP %d", ret);
break;
}
frames_.resize(num_frames+1);
backtrace_frame_data_t* frame = &frames_.at(num_frames);
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
FillInMap(frame->pc, &frame->map);
// Check to see if we should skip this frame because it's coming
// from within the library, and we are doing a local unwind.
if (ucontext != nullptr || num_frames != 0 || !DiscardFrame(*frame)) {
if (num_ignore_frames == 0) {
// GetFunctionName is an expensive call, only do it if we are
// keeping the frame.
frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
if (num_frames > 0) {
// Set the stack size for the previous frame.
backtrace_frame_data_t* prev = &frames_.at(num_frames-1);
prev->stack_size = frame->sp - prev->sp;
}
num_frames++;
} else {
num_ignore_frames--;
}
}
ret = unw_step (cursor.get());
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
return true;
}
bool UnwindPtrace::Unwind(size_t num_ignore_frames, ucontext_t* ucontext) {
if (GetMap() == nullptr) {
// Without a map object, we can't do anything.
error_ = BACKTRACE_UNWIND_ERROR_MAP_MISSING;
return false;
}
error_ = BACKTRACE_UNWIND_NO_ERROR;
if (ucontext) {
BACK_LOGW("Unwinding from a specified context not supported yet.");
error_ = BACKTRACE_UNWIND_ERROR_UNSUPPORTED_OPERATION;
return false;
}
if (!Init()) {
return false;
}
unw_cursor_t cursor;
int ret = unw_init_remote(&cursor, addr_space_, upt_info_);
if (ret < 0) {
BACK_LOGW("unw_init_remote failed %d", ret);
error_ = BACKTRACE_UNWIND_ERROR_SETUP_FAILED;
return false;
}
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
if (ret < 0) {
BACK_LOGW("Failed to read IP %d", ret);
break;
}
unw_word_t sp;
ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
if (ret < 0) {
BACK_LOGW("Failed to read SP %d", ret);
break;
}
if (num_ignore_frames == 0) {
frames_.resize(num_frames+1);
backtrace_frame_data_t* frame = &frames_.at(num_frames);
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
if (num_frames > 0) {
backtrace_frame_data_t* prev = &frames_.at(num_frames-1);
prev->stack_size = frame->sp - prev->sp;
}
FillInMap(frame->pc, &frame->map);
if (BacktraceMap::IsValid(frame->map)) {
frame->rel_pc = frame->pc - frame->map.start + frame->map.load_bias;
} else {
frame->rel_pc = frame->pc;
}
frame->func_name = GetFunctionName(frame->pc, &frame->func_offset, &frame->map);
num_frames++;
// If the pc is in a device map, then don't try to step.
if (frame->map.flags & PROT_DEVICE_MAP) {
break;
}
} else {
// If the pc is in a device map, then don't try to step.
backtrace_map_t map;
FillInMap(pc, &map);
if (map.flags & PROT_DEVICE_MAP) {
break;
}
num_ignore_frames--;
}
// Verify the sp is not in a device map.
backtrace_map_t map;
FillInMap(sp, &map);
if (map.flags & PROT_DEVICE_MAP) {
break;
}
ret = unw_step (&cursor);
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
return true;
}
bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) {
if (ucontext == nullptr) {
int ret = unw_getcontext(&context_);
if (ret < 0) {
BACK_LOGW("unw_getcontext failed %d", ret);
error_ = BACKTRACE_UNWIND_ERROR_SETUP_FAILED;
return false;
}
} else {
GetUnwContextFromUcontext(ucontext);
}
// The cursor structure is pretty large, do not put it on the stack.
std::unique_ptr<unw_cursor_t> cursor(new unw_cursor_t);
int ret = unw_init_local(cursor.get(), &context_);
if (ret < 0) {
BACK_LOGW("unw_init_local failed %d", ret);
error_ = BACKTRACE_UNWIND_ERROR_SETUP_FAILED;
return false;
}
initialized_ = true;
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(cursor.get(), UNW_REG_IP, &pc);
if (ret < 0) {
BACK_LOGW("Failed to read IP %d", ret);
break;
}
unw_word_t sp;
ret = unw_get_reg(cursor.get(), UNW_REG_SP, &sp);
if (ret < 0) {
BACK_LOGW("Failed to read SP %d", ret);
break;
}
frames_.resize(num_frames+1);
backtrace_frame_data_t* frame = &frames_.at(num_frames);
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
FillInMap(frame->pc, &frame->map);
// Check to see if we should skip this frame because it's coming
// from within the library, and we are doing a local unwind.
if (ucontext != nullptr || num_frames != 0 || !DiscardFrame(*frame)) {
if (num_ignore_frames == 0) {
// GetFunctionName is an expensive call, only do it if we are
// keeping the frame.
frame->func_name = GetFunctionName(frame->pc, &frame->func_offset, &frame->map);
if (num_frames > 0) {
// Set the stack size for the previous frame.
backtrace_frame_data_t* prev = &frames_.at(num_frames-1);
prev->stack_size = frame->sp - prev->sp;
}
if (BacktraceMap::IsValid(frame->map)) {
frame->rel_pc = frame->pc - frame->map.start + frame->map.load_bias;
} else {
frame->rel_pc = frame->pc;
}
num_frames++;
} else {
num_ignore_frames--;
// Set the number of frames to zero to remove the frame added
// above. By definition, if we still have frames to ignore
// there should only be one frame in the vector.
CHECK(num_frames == 0);
frames_.resize(0);
}
}
// If the pc is in a device map, then don't try to step.
if (frame->map.flags & PROT_DEVICE_MAP) {
break;
}
// Verify the sp is not in a device map too.
backtrace_map_t map;
FillInMap(frame->sp, &map);
if (map.flags & PROT_DEVICE_MAP) {
break;
}
ret = unw_step (cursor.get());
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
return true;
}
bool UnwindPtrace::Unwind(size_t num_ignore_frames, ucontext_t* ucontext) {
if (GetMap() == nullptr) {
// Without a map object, we can't do anything.
return false;
}
if (ucontext) {
BACK_LOGW("Unwinding from a specified context not supported yet.");
return false;
}
addr_space_ = unw_create_addr_space(&_UPT_accessors, 0);
if (!addr_space_) {
BACK_LOGW("unw_create_addr_space failed.");
return false;
}
UnwindMap* map = static_cast<UnwindMap*>(GetMap());
unw_map_set(addr_space_, map->GetMapCursor());
upt_info_ = reinterpret_cast<struct UPT_info*>(_UPT_create(Tid()));
if (!upt_info_) {
BACK_LOGW("Failed to create upt info.");
return false;
}
unw_cursor_t cursor;
int ret = unw_init_remote(&cursor, addr_space_, upt_info_);
if (ret < 0) {
BACK_LOGW("unw_init_remote failed %d", ret);
return false;
}
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
if (ret < 0) {
BACK_LOGW("Failed to read IP %d", ret);
break;
}
unw_word_t sp;
ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
if (ret < 0) {
BACK_LOGW("Failed to read SP %d", ret);
break;
}
if (num_ignore_frames == 0) {
frames_.resize(num_frames+1);
backtrace_frame_data_t* frame = &frames_.at(num_frames);
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
if (num_frames > 0) {
backtrace_frame_data_t* prev = &frames_.at(num_frames-1);
prev->stack_size = frame->sp - prev->sp;
}
frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
FillInMap(frame->pc, &frame->map);
num_frames++;
} else {
num_ignore_frames--;
}
ret = unw_step (&cursor);
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
return true;
}
