149 lines
4.0 KiB
C++
149 lines
4.0 KiB
C++
/*
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* Copyright (C) 2014 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 "backtrace-map"
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#include <ctype.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <log/log.h>
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#include <android-base/stringprintf.h>
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#include <backtrace/Backtrace.h>
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#include <backtrace/BacktraceMap.h>
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#include <backtrace/backtrace_constants.h>
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#if defined(__linux__)
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#include <procinfo/process_map.h>
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#endif
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using android::base::StringPrintf;
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std::string backtrace_map_t::Name() const {
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if (!name.empty()) return name;
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if (start == 0 && end == 0) return "";
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return StringPrintf("<anonymous:%" PRIPTR ">", start);
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}
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BacktraceMap::BacktraceMap(pid_t pid) : pid_(pid) {
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if (pid_ < 0) {
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pid_ = getpid();
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}
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}
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BacktraceMap::~BacktraceMap() {}
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void BacktraceMap::FillIn(uint64_t addr, backtrace_map_t* map) {
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ScopedBacktraceMapIteratorLock lock(this);
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for (auto it = begin(); it != end(); ++it) {
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const backtrace_map_t* entry = *it;
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if (addr >= entry->start && addr < entry->end) {
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*map = *entry;
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return;
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}
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}
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*map = {};
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}
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#if defined(__APPLE__)
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static bool ParseLine(const char* line, backtrace_map_t* map) {
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uint64_t start;
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uint64_t end;
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char permissions[5];
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int name_pos;
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// Mac OS vmmap(1) output:
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// __TEXT 0009f000-000a1000 [ 8K 8K] r-x/rwx SM=COW
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// /Volumes/android/dalvik-dev/out/host/darwin-x86/bin/libcorkscrew_test\n
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// 012345678901234567890123456789012345678901234567890123456789
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// 0 1 2 3 4 5
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if (sscanf(line, "%*21c %" SCNx64 "-%" SCNx64 " [%*13c] %3c/%*3c SM=%*3c %n", &start, &end,
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permissions, &name_pos) != 3) {
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return false;
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}
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map->start = start;
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map->end = end;
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map->flags = PROT_NONE;
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if (permissions[0] == 'r') {
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map->flags |= PROT_READ;
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}
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if (permissions[1] == 'w') {
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map->flags |= PROT_WRITE;
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}
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if (permissions[2] == 'x') {
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map->flags |= PROT_EXEC;
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}
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map->name = line + name_pos;
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if (!map->name.empty() && map->name[map->name.length() - 1] == '\n') {
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map->name.erase(map->name.length() - 1);
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}
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ALOGV("Parsed map: start=%p, end=%p, flags=%x, name=%s", reinterpret_cast<void*>(map->start),
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reinterpret_cast<void*>(map->end), map->flags, map->name.c_str());
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return true;
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}
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#endif // defined(__APPLE__)
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bool BacktraceMap::Build() {
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#if defined(__APPLE__)
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char
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cmd[sizeof(pid_t) * 3 + sizeof("vmmap -w -resident -submap -allSplitLibs -interleaved ") + 1];
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char line[1024];
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// cmd is guaranteed to always be big enough to hold this string.
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snprintf(cmd, sizeof(cmd), "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid_);
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FILE* fp = popen(cmd, "r");
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if (fp == nullptr) {
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return false;
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}
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while (fgets(line, sizeof(line), fp)) {
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backtrace_map_t map;
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if (ParseLine(line, &map)) {
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maps_.push_back(map);
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}
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}
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pclose(fp);
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return true;
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#else
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return android::procinfo::ReadProcessMaps(pid_,
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[&](const android::procinfo::MapInfo& mapinfo) {
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maps_.resize(maps_.size() + 1);
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backtrace_map_t& map = maps_.back();
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map.start = mapinfo.start;
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map.end = mapinfo.end;
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map.flags = mapinfo.flags;
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map.name = mapinfo.name;
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});
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#endif
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}
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#if defined(__APPLE__)
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// Corkscrew and libunwind don't compile on the mac, so create a generic
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// map object.
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BacktraceMap* BacktraceMap::Create(pid_t pid, bool /*uncached*/) {
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BacktraceMap* map = new BacktraceMap(pid);
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if (!map->Build()) {
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delete map;
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return nullptr;
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}
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return map;
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}
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#endif
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