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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "libbacktrace"
#include <backtrace/backtrace.h>
#include <sys/types.h>
#include <string.h>
#include <cutils/log.h>
#include <libunwind.h>
#include <libunwind-ptrace.h>
#include "UnwindPtrace.h"
UnwindPtrace::UnwindPtrace() : addr_space_(NULL), upt_info_(NULL) {
}
UnwindPtrace::~UnwindPtrace() {
if (upt_info_) {
_UPT_destroy(upt_info_);
upt_info_ = NULL;
}
if (addr_space_) {
unw_destroy_addr_space(addr_space_);
addr_space_ = NULL;
}
}
bool UnwindPtrace::Unwind(size_t num_ignore_frames) {
addr_space_ = unw_create_addr_space(&_UPT_accessors, 0);
if (!addr_space_) {
ALOGW("UnwindPtrace::Unwind: unw_create_addr_space failed.\n");
return false;
}
upt_info_ = reinterpret_cast<struct UPT_info*>(_UPT_create(backtrace_obj_->Tid()));
if (!upt_info_) {
ALOGW("UnwindPtrace::Unwind: Failed to create upt info.\n");
return false;
}
backtrace_t* backtrace = GetBacktraceData();
backtrace->num_frames = 0;
unw_cursor_t cursor;
int ret = unw_init_remote(&cursor, addr_space_, upt_info_);
if (ret < 0) {
ALOGW("UnwindPtrace::Unwind: unw_init_remote failed %d\n", ret);
return false;
}
do {
unw_word_t pc;
ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
if (ret < 0) {
ALOGW("UnwindPtrace::Unwind: Failed to read IP %d\n", ret);
break;
}
unw_word_t sp;
ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
if (ret < 0) {
ALOGW("UnwindPtrace::Unwind: Failed to read SP %d\n", ret);
break;
}
if (num_ignore_frames == 0) {
size_t num_frames = backtrace->num_frames;
backtrace_frame_data_t* frame = &backtrace->frames[num_frames];
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
frame->map_name = NULL;
frame->map_offset = 0;
frame->func_name = NULL;
frame->func_offset = 0;
if (num_frames > 0) {
backtrace_frame_data_t* prev = &backtrace->frames[num_frames-1];
prev->stack_size = frame->sp - prev->sp;
}
std::string func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
if (!func_name.empty()) {
frame->func_name = strdup(func_name.c_str());
}
uintptr_t map_start;
frame->map_name = backtrace_obj_->GetMapName(frame->pc, &map_start);
if (frame->map_name) {
frame->map_offset = frame->pc - map_start;
}
backtrace->num_frames++;
} else {
num_ignore_frames--;
}
ret = unw_step (&cursor);
} while (ret > 0 && backtrace->num_frames < MAX_BACKTRACE_FRAMES);
return true;
}
std::string UnwindPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
*offset = 0;
char buf[512];
unw_word_t value;
if (unw_get_proc_name_by_ip(addr_space_, pc, buf, sizeof(buf), &value,
upt_info_) >= 0 && buf[0] != '\0') {
*offset = static_cast<uintptr_t>(value);
return buf;
}
return "";
}
//-------------------------------------------------------------------------
// C++ object creation function.
//-------------------------------------------------------------------------
Backtrace* CreatePtraceObj(pid_t pid, pid_t tid) {
return new BacktracePtrace(new UnwindPtrace(), pid, tid);
}
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