338 lines
11 KiB
C++
338 lines
11 KiB
C++
/*
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* Copyright (C) 2015 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 "thread_tree.h"
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#include <inttypes.h>
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#include <limits>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include "perf_event.h"
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#include "record.h"
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namespace simpleperf {
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bool MapComparator::operator()(const MapEntry* map1,
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const MapEntry* map2) const {
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if (map1->start_addr != map2->start_addr) {
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return map1->start_addr < map2->start_addr;
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}
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// Compare map->len instead of map->get_end_addr() here. Because we set map's
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// len to std::numeric_limits<uint64_t>::max() in FindMapByAddr(), which makes
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// map->get_end_addr() overflow.
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if (map1->len != map2->len) {
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return map1->len < map2->len;
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}
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if (map1->time != map2->time) {
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return map1->time < map2->time;
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}
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return false;
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}
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void ThreadTree::SetThreadName(int pid, int tid, const std::string& comm) {
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ThreadEntry* thread = FindThreadOrNew(pid, tid);
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if (comm != thread->comm) {
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thread_comm_storage_.push_back(
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std::unique_ptr<std::string>(new std::string(comm)));
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thread->comm = thread_comm_storage_.back()->c_str();
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}
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}
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void ThreadTree::ForkThread(int pid, int tid, int ppid, int ptid) {
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ThreadEntry* parent = FindThreadOrNew(ppid, ptid);
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ThreadEntry* child = FindThreadOrNew(pid, tid);
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child->comm = parent->comm;
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if (pid != ppid) {
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// Copy maps from parent process.
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*child->maps = *parent->maps;
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}
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}
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ThreadEntry* ThreadTree::FindThreadOrNew(int pid, int tid) {
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auto it = thread_tree_.find(tid);
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if (it == thread_tree_.end()) {
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return CreateThread(pid, tid);
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} else {
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if (pid != it->second.get()->pid) {
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// TODO: b/22185053.
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LOG(DEBUG) << "unexpected (pid, tid) pair: expected ("
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<< it->second.get()->pid << ", " << tid << "), actual (" << pid
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<< ", " << tid << ")";
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}
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}
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return it->second.get();
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}
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ThreadEntry* ThreadTree::CreateThread(int pid, int tid) {
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MapSet* maps = nullptr;
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if (pid == tid) {
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maps = new MapSet;
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map_set_storage_.push_back(std::unique_ptr<MapSet>(maps));
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} else {
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// Share maps among threads in the same thread group.
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ThreadEntry* process = FindThreadOrNew(pid, pid);
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maps = process->maps;
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}
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ThreadEntry* thread = new ThreadEntry{
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pid, tid,
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"unknown",
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maps,
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};
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auto pair = thread_tree_.insert(std::make_pair(tid, std::unique_ptr<ThreadEntry>(thread)));
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CHECK(pair.second);
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return thread;
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}
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void ThreadTree::AddKernelMap(uint64_t start_addr, uint64_t len, uint64_t pgoff,
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uint64_t time, const std::string& filename) {
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// kernel map len can be 0 when record command is not run in supervisor mode.
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if (len == 0) {
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return;
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}
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Dso* dso = FindKernelDsoOrNew(filename);
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MapEntry* map =
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AllocateMap(MapEntry(start_addr, len, pgoff, time, dso, true));
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FixOverlappedMap(&kernel_maps_, map);
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auto pair = kernel_maps_.insert(map);
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CHECK(pair.second);
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}
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Dso* ThreadTree::FindKernelDsoOrNew(const std::string& filename) {
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if (filename == DEFAULT_KERNEL_MMAP_NAME ||
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filename == DEFAULT_KERNEL_MMAP_NAME_PERF) {
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return kernel_dso_.get();
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}
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auto it = module_dso_tree_.find(filename);
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if (it == module_dso_tree_.end()) {
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module_dso_tree_[filename] = Dso::CreateDso(DSO_KERNEL_MODULE, filename);
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it = module_dso_tree_.find(filename);
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}
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return it->second.get();
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}
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void ThreadTree::AddThreadMap(int pid, int tid, uint64_t start_addr,
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uint64_t len, uint64_t pgoff, uint64_t time,
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const std::string& filename) {
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ThreadEntry* thread = FindThreadOrNew(pid, tid);
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Dso* dso = FindUserDsoOrNew(filename, start_addr);
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MapEntry* map =
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AllocateMap(MapEntry(start_addr, len, pgoff, time, dso, false));
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FixOverlappedMap(thread->maps, map);
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auto pair = thread->maps->insert(map);
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CHECK(pair.second);
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}
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Dso* ThreadTree::FindUserDsoOrNew(const std::string& filename, uint64_t start_addr) {
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auto it = user_dso_tree_.find(filename);
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if (it == user_dso_tree_.end()) {
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bool force_64bit = start_addr > UINT_MAX;
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user_dso_tree_[filename] = Dso::CreateDso(DSO_ELF_FILE, filename, force_64bit);
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it = user_dso_tree_.find(filename);
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}
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return it->second.get();
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}
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MapEntry* ThreadTree::AllocateMap(const MapEntry& value) {
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MapEntry* map = new MapEntry(value);
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map_storage_.push_back(std::unique_ptr<MapEntry>(map));
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return map;
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}
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void ThreadTree::FixOverlappedMap(MapSet* maps, const MapEntry* map) {
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for (auto it = maps->begin(); it != maps->end();) {
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if ((*it)->start_addr >= map->get_end_addr()) {
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// No more overlapped maps.
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break;
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}
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if ((*it)->get_end_addr() <= map->start_addr) {
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++it;
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} else {
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MapEntry* old = *it;
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if (old->start_addr < map->start_addr) {
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MapEntry* before = AllocateMap(
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MapEntry(old->start_addr, map->start_addr - old->start_addr,
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old->pgoff, old->time, old->dso, old->in_kernel));
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maps->insert(before);
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}
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if (old->get_end_addr() > map->get_end_addr()) {
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MapEntry* after = AllocateMap(MapEntry(
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map->get_end_addr(), old->get_end_addr() - map->get_end_addr(),
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map->get_end_addr() - old->start_addr + old->pgoff, old->time,
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old->dso, old->in_kernel));
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maps->insert(after);
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}
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it = maps->erase(it);
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}
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}
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}
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static bool IsAddrInMap(uint64_t addr, const MapEntry* map) {
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return (addr >= map->start_addr && addr < map->get_end_addr());
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}
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static MapEntry* FindMapByAddr(const MapSet& maps, uint64_t addr) {
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// Construct a map_entry which is strictly after the searched map_entry, based
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// on MapComparator.
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MapEntry find_map(addr, std::numeric_limits<uint64_t>::max(), 0,
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std::numeric_limits<uint64_t>::max(), nullptr, false);
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auto it = maps.upper_bound(&find_map);
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if (it != maps.begin() && IsAddrInMap(addr, *--it)) {
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return *it;
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}
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return nullptr;
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}
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const MapEntry* ThreadTree::FindMap(const ThreadEntry* thread, uint64_t ip,
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bool in_kernel) {
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MapEntry* result = nullptr;
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if (!in_kernel) {
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result = FindMapByAddr(*thread->maps, ip);
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} else {
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result = FindMapByAddr(kernel_maps_, ip);
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}
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return result != nullptr ? result : &unknown_map_;
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}
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const MapEntry* ThreadTree::FindMap(const ThreadEntry* thread, uint64_t ip) {
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MapEntry* result = FindMapByAddr(*thread->maps, ip);
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if (result != nullptr) {
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return result;
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}
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result = FindMapByAddr(kernel_maps_, ip);
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return result != nullptr ? result : &unknown_map_;
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}
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const Symbol* ThreadTree::FindSymbol(const MapEntry* map, uint64_t ip,
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uint64_t* pvaddr_in_file, Dso** pdso) {
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uint64_t vaddr_in_file;
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Dso* dso = map->dso;
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vaddr_in_file = ip - map->start_addr + map->dso->MinVirtualAddress();
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const Symbol* symbol = dso->FindSymbol(vaddr_in_file);
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if (symbol == nullptr && map->in_kernel && dso != kernel_dso_.get()) {
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// It is in a kernel module, but we can't find the kernel module file, or
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// the kernel module file contains no symbol. Try finding the symbol in
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// /proc/kallsyms.
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vaddr_in_file = ip;
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dso = kernel_dso_.get();
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symbol = dso->FindSymbol(vaddr_in_file);
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}
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if (symbol == nullptr) {
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if (show_ip_for_unknown_symbol_) {
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std::string name = android::base::StringPrintf(
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"%s%s[+%" PRIx64 "]", (show_mark_for_unknown_symbol_ ? "*" : ""),
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dso->FileName().c_str(), vaddr_in_file);
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dso->AddUnknownSymbol(vaddr_in_file, name);
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symbol = dso->FindSymbol(vaddr_in_file);
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CHECK(symbol != nullptr);
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} else {
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symbol = &unknown_symbol_;
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}
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}
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if (pvaddr_in_file != nullptr) {
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*pvaddr_in_file = vaddr_in_file;
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}
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if (pdso != nullptr) {
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*pdso = dso;
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}
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return symbol;
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}
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const Symbol* ThreadTree::FindKernelSymbol(uint64_t ip) {
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const MapEntry* map = FindMap(nullptr, ip, true);
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return FindSymbol(map, ip, nullptr);
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}
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void ThreadTree::ClearThreadAndMap() {
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thread_tree_.clear();
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thread_comm_storage_.clear();
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map_set_storage_.clear();
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kernel_maps_.clear();
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map_storage_.clear();
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}
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void ThreadTree::AddDsoInfo(const std::string& file_path, uint32_t file_type,
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uint64_t min_vaddr, std::vector<Symbol>* symbols) {
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DsoType dso_type = static_cast<DsoType>(file_type);
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Dso* dso = nullptr;
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if (dso_type == DSO_KERNEL || dso_type == DSO_KERNEL_MODULE) {
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dso = FindKernelDsoOrNew(file_path);
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} else {
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dso = FindUserDsoOrNew(file_path);
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}
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dso->SetMinVirtualAddress(min_vaddr);
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dso->SetSymbols(symbols);
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}
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void ThreadTree::Update(const Record& record) {
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if (record.type() == PERF_RECORD_MMAP) {
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const MmapRecord& r = *static_cast<const MmapRecord*>(&record);
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if (r.InKernel()) {
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AddKernelMap(r.data->addr, r.data->len, r.data->pgoff,
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r.sample_id.time_data.time, r.filename);
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} else {
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AddThreadMap(r.data->pid, r.data->tid, r.data->addr, r.data->len,
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r.data->pgoff, r.sample_id.time_data.time, r.filename);
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}
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} else if (record.type() == PERF_RECORD_MMAP2) {
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const Mmap2Record& r = *static_cast<const Mmap2Record*>(&record);
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if (r.InKernel()) {
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AddKernelMap(r.data->addr, r.data->len, r.data->pgoff,
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r.sample_id.time_data.time, r.filename);
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} else {
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std::string filename = (r.filename == DEFAULT_EXECNAME_FOR_THREAD_MMAP)
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? "[unknown]"
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: r.filename;
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AddThreadMap(r.data->pid, r.data->tid, r.data->addr, r.data->len,
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r.data->pgoff, r.sample_id.time_data.time, filename);
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}
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} else if (record.type() == PERF_RECORD_COMM) {
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const CommRecord& r = *static_cast<const CommRecord*>(&record);
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SetThreadName(r.data->pid, r.data->tid, r.comm);
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} else if (record.type() == PERF_RECORD_FORK) {
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const ForkRecord& r = *static_cast<const ForkRecord*>(&record);
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ForkThread(r.data->pid, r.data->tid, r.data->ppid, r.data->ptid);
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} else if (record.type() == SIMPLE_PERF_RECORD_KERNEL_SYMBOL) {
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const auto& r = *static_cast<const KernelSymbolRecord*>(&record);
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Dso::SetKallsyms(std::move(r.kallsyms));
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}
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}
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std::vector<Dso*> ThreadTree::GetAllDsos() const {
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std::vector<Dso*> result;
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result.push_back(kernel_dso_.get());
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for (auto& p : module_dso_tree_) {
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result.push_back(p.second.get());
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}
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for (auto& p : user_dso_tree_) {
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result.push_back(p.second.get());
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}
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result.push_back(unknown_dso_.get());
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return result;
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}
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std::vector<const ThreadEntry*> ThreadTree::GetAllThreads() const {
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std::vector<const ThreadEntry*> threads;
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for (auto& pair : thread_tree_) {
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threads.push_back(pair.second.get());
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}
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return threads;
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}
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} // namespace simpleperf
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