20303f856f
Use the libbacktrace C++ interface instead of the C interface in debuggerd. Reformat the debuggerd code to be closer to Google C++ style. Fix all debuggerd casts to be C++ casts. Add a frame number to the frame data structure for ease of formatting and add another FormatFrameData function. Change the format_test to use the new FormatFrameData function. Modify all of the backtrace_test to use the C++ interface. Change-Id: I10e1610861acf7f4a3ad53276b74971cfbfda464
205 lines
6.2 KiB
C++
205 lines
6.2 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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#define LOG_TAG "libbacktrace"
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#include <sys/types.h>
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#include <cutils/log.h>
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#include <backtrace/backtrace.h>
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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#include "UnwindCurrent.h"
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// Define the ucontext_t structures needed for each supported arch.
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#if defined(__arm__)
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// The current version of the <signal.h> doesn't define ucontext_t.
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#include <asm/sigcontext.h> // Ensure 'struct sigcontext' is defined.
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// Machine context at the time a signal was raised.
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typedef struct ucontext {
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uint32_t uc_flags;
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struct ucontext* uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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uint32_t uc_sigmask;
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} ucontext_t;
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#elif defined(__i386__)
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#include <asm/sigcontext.h>
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#include <asm/ucontext.h>
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typedef struct ucontext ucontext_t;
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#elif !defined(__mips__)
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#error Unsupported architecture.
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#endif
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//-------------------------------------------------------------------------
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// UnwindCurrent functions.
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//-------------------------------------------------------------------------
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UnwindCurrent::UnwindCurrent() {
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}
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UnwindCurrent::~UnwindCurrent() {
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}
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bool UnwindCurrent::Unwind(size_t num_ignore_frames) {
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int ret = unw_getcontext(&context_);
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if (ret < 0) {
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BACK_LOGW("unw_getcontext failed %d", ret);
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return false;
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}
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return UnwindFromContext(num_ignore_frames, true);
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}
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std::string UnwindCurrent::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(unw_local_addr_space, pc, buf, sizeof(buf),
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&value, &context_) >= 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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bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
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backtrace_t* backtrace = GetBacktraceData();
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backtrace->num_frames = 0;
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// The cursor structure is pretty large, do not put it on the stack.
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unw_cursor_t* cursor = new unw_cursor_t;
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int ret = unw_init_local(cursor, &context_);
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if (ret < 0) {
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BACK_LOGW("unw_init_local failed %d", ret);
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delete cursor;
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return false;
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}
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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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size_t num_frames = backtrace->num_frames;
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backtrace_frame_data_t* frame = &backtrace->frames[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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frame->map_name = NULL;
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frame->map_offset = 0;
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frame->func_name = NULL;
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frame->func_offset = 0;
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if (num_frames > 0) {
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// Set the stack size for the previous frame.
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backtrace_frame_data_t* prev = &backtrace->frames[num_frames-1];
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prev->stack_size = frame->sp - prev->sp;
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}
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if (resolve) {
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std::string func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
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if (!func_name.empty()) {
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frame->func_name = strdup(func_name.c_str());
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}
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uintptr_t map_start;
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frame->map_name = backtrace_obj_->GetMapName(frame->pc, &map_start);
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if (frame->map_name) {
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frame->map_offset = frame->pc - map_start;
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}
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}
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backtrace->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 && backtrace->num_frames < MAX_BACKTRACE_FRAMES);
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delete cursor;
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return true;
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}
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void UnwindCurrent::ExtractContext(void* sigcontext) {
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unw_tdep_context_t* context = reinterpret_cast<unw_tdep_context_t*>(&context_);
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const ucontext_t* uc = reinterpret_cast<const ucontext_t*>(sigcontext);
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#if defined(__arm__)
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context->regs[0] = uc->uc_mcontext.arm_r0;
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context->regs[1] = uc->uc_mcontext.arm_r1;
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context->regs[2] = uc->uc_mcontext.arm_r2;
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context->regs[3] = uc->uc_mcontext.arm_r3;
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context->regs[4] = uc->uc_mcontext.arm_r4;
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context->regs[5] = uc->uc_mcontext.arm_r5;
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context->regs[6] = uc->uc_mcontext.arm_r6;
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context->regs[7] = uc->uc_mcontext.arm_r7;
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context->regs[8] = uc->uc_mcontext.arm_r8;
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context->regs[9] = uc->uc_mcontext.arm_r9;
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context->regs[10] = uc->uc_mcontext.arm_r10;
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context->regs[11] = uc->uc_mcontext.arm_fp;
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context->regs[12] = uc->uc_mcontext.arm_ip;
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context->regs[13] = uc->uc_mcontext.arm_sp;
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context->regs[14] = uc->uc_mcontext.arm_lr;
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context->regs[15] = uc->uc_mcontext.arm_pc;
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#elif defined(__mips__) || defined(__i386__)
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context->uc_mcontext = uc->uc_mcontext;
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#endif
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}
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//-------------------------------------------------------------------------
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// UnwindThread functions.
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//-------------------------------------------------------------------------
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UnwindThread::UnwindThread() {
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}
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UnwindThread::~UnwindThread() {
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}
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bool UnwindThread::Init() {
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return true;
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}
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void UnwindThread::ThreadUnwind(
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siginfo_t* /*siginfo*/, void* sigcontext, size_t num_ignore_frames) {
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ExtractContext(sigcontext);
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UnwindFromContext(num_ignore_frames, false);
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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* CreateCurrentObj(backtrace_map_info_t* map_info) {
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return new BacktraceCurrent(new UnwindCurrent(), map_info);
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}
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Backtrace* CreateThreadObj(pid_t tid, backtrace_map_info_t* map_info) {
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UnwindThread* thread_obj = new UnwindThread();
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return new BacktraceThread(thread_obj, thread_obj, tid, map_info);
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}
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