summaryrefslogtreecommitdiffstats
path: root/libbacktrace/BacktraceImpl.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'libbacktrace/BacktraceImpl.cpp')
-rw-r--r--libbacktrace/BacktraceImpl.cpp283
1 files changed, 0 insertions, 283 deletions
diff --git a/libbacktrace/BacktraceImpl.cpp b/libbacktrace/BacktraceImpl.cpp
deleted file mode 100644
index 4650b6a..0000000
--- a/libbacktrace/BacktraceImpl.cpp
+++ /dev/null
@@ -1,283 +0,0 @@
-/*
- * 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.
- */
-
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/param.h>
-#include <sys/ptrace.h>
-#include <sys/types.h>
-#include <ucontext.h>
-#include <unistd.h>
-
-#include <string>
-
-#include <backtrace/Backtrace.h>
-#include <backtrace/BacktraceMap.h>
-
-#include "BacktraceImpl.h"
-#include "BacktraceLog.h"
-#include "thread_utils.h"
-
-//-------------------------------------------------------------------------
-// Backtrace functions.
-//-------------------------------------------------------------------------
-Backtrace::Backtrace(BacktraceImpl* impl, pid_t pid, BacktraceMap* map)
- : pid_(pid), tid_(-1), map_(map), map_shared_(true), impl_(impl) {
- impl_->SetParent(this);
-
- if (map_ == NULL) {
- map_ = BacktraceMap::Create(pid);
- map_shared_ = false;
- }
-}
-
-Backtrace::~Backtrace() {
- if (impl_) {
- delete impl_;
- impl_ = NULL;
- }
-
- if (map_ && !map_shared_) {
- delete map_;
- map_ = NULL;
- }
-}
-
-bool Backtrace::Unwind(size_t num_ignore_frames, ucontext_t* ucontext) {
- return impl_->Unwind(num_ignore_frames, ucontext);
-}
-
-extern "C" char* __cxa_demangle(const char* mangled, char* buf, size_t* len,
- int* status);
-
-std::string Backtrace::GetFunctionName(uintptr_t pc, uintptr_t* offset) {
- std::string func_name = impl_->GetFunctionNameRaw(pc, offset);
- if (!func_name.empty()) {
-#if defined(__APPLE__)
- // Mac OS' __cxa_demangle demangles "f" as "float"; last tested on 10.7.
- if (func_name[0] != '_') {
- return func_name;
- }
-#endif
- char* name = __cxa_demangle(func_name.c_str(), 0, 0, 0);
- if (name) {
- func_name = name;
- free(name);
- }
- }
- return func_name;
-}
-
-bool Backtrace::VerifyReadWordArgs(uintptr_t ptr, word_t* out_value) {
- if (ptr & (sizeof(word_t)-1)) {
- BACK_LOGW("invalid pointer %p", (void*)ptr);
- *out_value = (word_t)-1;
- return false;
- }
- return true;
-}
-
-std::string Backtrace::FormatFrameData(size_t frame_num) {
- if (frame_num >= frames_.size()) {
- return "";
- }
- return FormatFrameData(&frames_[frame_num]);
-}
-
-std::string Backtrace::FormatFrameData(const backtrace_frame_data_t* frame) {
- const char* map_name;
- if (BacktraceMap::IsValid(frame->map) && !frame->map.name.empty()) {
- map_name = frame->map.name.c_str();
- } else {
- map_name = "<unknown>";
- }
-
- uintptr_t relative_pc;
- if (BacktraceMap::IsValid(frame->map)) {
- relative_pc = frame->pc - frame->map.start;
- } else {
- relative_pc = frame->pc;
- }
-
- char buf[512];
- if (!frame->func_name.empty() && frame->func_offset) {
- snprintf(buf, sizeof(buf), "#%02zu pc %0*" PRIxPTR " %s (%s+%" PRIuPTR ")",
- frame->num, (int)sizeof(uintptr_t)*2, relative_pc, map_name,
- frame->func_name.c_str(), frame->func_offset);
- } else if (!frame->func_name.empty()) {
- snprintf(buf, sizeof(buf), "#%02zu pc %0*" PRIxPTR " %s (%s)", frame->num,
- (int)sizeof(uintptr_t)*2, relative_pc, map_name, frame->func_name.c_str());
- } else {
- snprintf(buf, sizeof(buf), "#%02zu pc %0*" PRIxPTR " %s", frame->num,
- (int)sizeof(uintptr_t)*2, relative_pc, map_name);
- }
-
- return buf;
-}
-
-void Backtrace::FillInMap(uintptr_t pc, backtrace_map_t* map) {
- map_->FillIn(pc, map);
-}
-
-//-------------------------------------------------------------------------
-// BacktraceCurrent functions.
-//-------------------------------------------------------------------------
-BacktraceCurrent::BacktraceCurrent(
- BacktraceImpl* impl, BacktraceMap* map) : Backtrace(impl, getpid(), map) {
-}
-
-BacktraceCurrent::~BacktraceCurrent() {
-}
-
-bool BacktraceCurrent::ReadWord(uintptr_t ptr, word_t* out_value) {
- if (!VerifyReadWordArgs(ptr, out_value)) {
- return false;
- }
-
- backtrace_map_t map;
- FillInMap(ptr, &map);
- if (BacktraceMap::IsValid(map) && map.flags & PROT_READ) {
- *out_value = *reinterpret_cast<word_t*>(ptr);
- return true;
- } else {
- BACK_LOGW("pointer %p not in a readable map", reinterpret_cast<void*>(ptr));
- *out_value = static_cast<word_t>(-1);
- return false;
- }
-}
-
-size_t BacktraceCurrent::Read(uintptr_t addr, uint8_t* buffer, size_t bytes) {
- backtrace_map_t map;
- FillInMap(addr, &map);
- if (!BacktraceMap::IsValid(map) || !(map.flags & PROT_READ)) {
- return 0;
- }
- bytes = MIN(map.end - addr, bytes);
- memcpy(buffer, reinterpret_cast<uint8_t*>(addr), bytes);
- return bytes;
-}
-
-//-------------------------------------------------------------------------
-// BacktracePtrace functions.
-//-------------------------------------------------------------------------
-BacktracePtrace::BacktracePtrace(
- BacktraceImpl* impl, pid_t pid, pid_t tid, BacktraceMap* map)
- : Backtrace(impl, pid, map) {
- tid_ = tid;
-}
-
-BacktracePtrace::~BacktracePtrace() {
-}
-
-#if !defined(__APPLE__)
-static bool PtraceRead(pid_t tid, uintptr_t addr, word_t* out_value) {
- // ptrace() returns -1 and sets errno when the operation fails.
- // To disambiguate -1 from a valid result, we clear errno beforehand.
- errno = 0;
- *out_value = ptrace(PTRACE_PEEKTEXT, tid, reinterpret_cast<void*>(addr), NULL);
- if (*out_value == static_cast<word_t>(-1) && errno) {
- BACK_LOGW("invalid pointer %p reading from tid %d, ptrace() strerror(errno)=%s",
- reinterpret_cast<void*>(addr), tid, strerror(errno));
- return false;
- }
- return true;
-}
-#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
-}
-
-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
-}
-
-Backtrace* Backtrace::Create(pid_t pid, pid_t tid, BacktraceMap* map) {
- if (pid == BACKTRACE_CURRENT_PROCESS || pid == getpid()) {
- if (tid == BACKTRACE_CURRENT_THREAD || tid == gettid()) {
- return CreateCurrentObj(map);
- } else {
- return CreateThreadObj(tid, map);
- }
- } else if (tid == BACKTRACE_CURRENT_THREAD) {
- return CreatePtraceObj(pid, pid, map);
- } else {
- return CreatePtraceObj(pid, tid, map);
- }
-}
generated by cgit v1.1 at 2025-01-13 21:15:15 +0000