138 lines
3.8 KiB
C++
138 lines
3.8 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <backtrace/Backtrace.h>
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#include <backtrace/BacktraceMap.h>
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#include <sys/types.h>
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#include <string.h>
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#include <ucontext.h>
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#include <libunwind.h>
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#include <libunwind-ptrace.h>
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#include "BacktraceLog.h"
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#include "UnwindMap.h"
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#include "UnwindPtrace.h"
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UnwindPtrace::UnwindPtrace() : addr_space_(NULL), upt_info_(NULL) {
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}
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UnwindPtrace::~UnwindPtrace() {
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if (upt_info_) {
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_UPT_destroy(upt_info_);
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upt_info_ = NULL;
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}
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if (addr_space_) {
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// Remove the map from the address space before destroying it.
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// It will be freed in the UnwindMap destructor.
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unw_map_set(addr_space_, NULL);
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unw_destroy_addr_space(addr_space_);
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addr_space_ = NULL;
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}
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}
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bool UnwindPtrace::Unwind(size_t num_ignore_frames, ucontext_t* ucontext) {
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if (ucontext) {
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BACK_LOGW("Unwinding from a specified context not supported yet.");
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return false;
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}
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addr_space_ = unw_create_addr_space(&_UPT_accessors, 0);
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if (!addr_space_) {
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BACK_LOGW("unw_create_addr_space failed.");
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return false;
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}
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UnwindMap* map = static_cast<UnwindMap*>(GetMap());
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unw_map_set(addr_space_, map->GetMapCursor());
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upt_info_ = reinterpret_cast<struct UPT_info*>(_UPT_create(Tid()));
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if (!upt_info_) {
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BACK_LOGW("Failed to create upt info.");
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return false;
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}
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unw_cursor_t cursor;
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int ret = unw_init_remote(&cursor, addr_space_, upt_info_);
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if (ret < 0) {
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BACK_LOGW("unw_init_remote failed %d", ret);
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return false;
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}
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std::vector<backtrace_frame_data_t>* frames = GetFrames();
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frames->reserve(MAX_BACKTRACE_FRAMES);
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size_t num_frames = 0;
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do {
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unw_word_t pc;
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ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
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if (ret < 0) {
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BACK_LOGW("Failed to read IP %d", ret);
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break;
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}
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unw_word_t sp;
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ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
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if (ret < 0) {
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BACK_LOGW("Failed to read SP %d", ret);
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break;
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}
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if (num_ignore_frames == 0) {
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frames->resize(num_frames+1);
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backtrace_frame_data_t* frame = &frames->at(num_frames);
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frame->num = num_frames;
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frame->pc = static_cast<uintptr_t>(pc);
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frame->sp = static_cast<uintptr_t>(sp);
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frame->stack_size = 0;
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if (num_frames > 0) {
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backtrace_frame_data_t* prev = &frames->at(num_frames-1);
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prev->stack_size = frame->sp - prev->sp;
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}
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frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
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frame->map = FindMap(frame->pc);
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num_frames++;
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} else {
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num_ignore_frames--;
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}
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ret = unw_step (&cursor);
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} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
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return true;
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}
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std::string UnwindPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
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*offset = 0;
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char buf[512];
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unw_word_t value;
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if (unw_get_proc_name_by_ip(addr_space_, pc, buf, sizeof(buf), &value,
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upt_info_) >= 0 && buf[0] != '\0') {
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*offset = static_cast<uintptr_t>(value);
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return buf;
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}
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return "";
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}
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//-------------------------------------------------------------------------
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// C++ object creation function.
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//-------------------------------------------------------------------------
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Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, BacktraceMap* map) {
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return new BacktracePtrace(new UnwindPtrace(), pid, tid, map);
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}
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