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421 lines
14 KiB
421 lines
14 KiB
/*
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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 <android-base/strings.h>
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#include "perf_event.h"
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#include "record.h"
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#include "record_file.h"
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#include "utils.h"
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namespace simpleperf {
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namespace {
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// Real map file path depends on where the process can create files.
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// For example, app can create files only in its data directory.
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// Use normalized name inherited from pid instead.
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std::string GetSymbolMapDsoName(int pid) {
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return android::base::StringPrintf("perf-%d.map", pid);
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}
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} // namespace
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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(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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if (child->maps->maps.empty()) {
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*child->maps = *parent->maps;
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} else {
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CHECK_NE(child->maps, parent->maps);
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for (auto& pair : parent->maps->maps) {
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InsertMap(*child->maps, *pair.second);
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}
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}
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}
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}
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ThreadEntry* ThreadTree::FindThread(int tid) const {
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if (auto it = thread_tree_.find(tid); it != thread_tree_.end()) {
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return it->second.get();
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}
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return nullptr;
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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() && pid == it->second.get()->pid) {
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return it->second.get();
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}
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if (it != thread_tree_.end()) {
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ExitThread(it->second.get()->pid, tid);
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}
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return CreateThread(pid, tid);
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}
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ThreadEntry* ThreadTree::CreateThread(int pid, int tid) {
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const char* comm;
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std::shared_ptr<MapSet> maps;
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if (pid == tid) {
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comm = "unknown";
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maps.reset(new MapSet);
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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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comm = process->comm;
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maps = process->maps;
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}
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ThreadEntry* thread = new ThreadEntry{
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pid,
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tid,
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comm,
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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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if (pid == tid) {
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// If there is a symbol map dso for the process, add maps for the symbols.
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auto name = GetSymbolMapDsoName(pid);
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auto it = user_dso_tree_.find(name);
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if (it != user_dso_tree_.end()) {
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AddThreadMapsForDsoSymbols(thread, it->second.get());
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}
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}
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return thread;
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}
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void ThreadTree::ExitThread(int pid, int tid) {
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auto it = thread_tree_.find(tid);
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if (it != thread_tree_.end() && pid == it->second.get()->pid) {
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thread_tree_.erase(it);
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}
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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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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;
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if (android::base::StartsWith(filename, DEFAULT_KERNEL_MMAP_NAME)) {
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dso = FindKernelDsoOrNew();
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} else {
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dso = FindKernelModuleDsoOrNew(filename, start_addr, start_addr + len);
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}
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InsertMap(kernel_maps_, MapEntry(start_addr, len, pgoff, dso, true));
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}
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Dso* ThreadTree::FindKernelDsoOrNew() {
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if (!kernel_dso_) {
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kernel_dso_ = Dso::CreateDso(DSO_KERNEL, DEFAULT_KERNEL_MMAP_NAME);
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}
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return kernel_dso_.get();
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}
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Dso* ThreadTree::FindKernelModuleDsoOrNew(const std::string& filename, uint64_t memory_start,
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uint64_t memory_end) {
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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] =
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Dso::CreateKernelModuleDso(filename, memory_start, memory_end, FindKernelDsoOrNew());
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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, uint64_t len, uint64_t pgoff,
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const std::string& filename, uint32_t flags) {
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ThreadEntry* thread = FindThreadOrNew(pid, tid);
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Dso* dso = FindUserDsoOrNew(filename, start_addr);
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InsertMap(*thread->maps, MapEntry(start_addr, len, pgoff, dso, false, flags));
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}
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void ThreadTree::AddThreadMapsForDsoSymbols(ThreadEntry* thread, Dso* dso) {
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const uint64_t page_size = GetPageSize();
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auto maps = thread->maps;
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uint64_t map_start = 0;
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uint64_t map_end = 0;
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// Dso symbols are sorted by address. Walk and calculate containing pages.
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for (const auto& sym : dso->GetSymbols()) {
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uint64_t sym_map_start = AlignDown(sym.addr, page_size);
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uint64_t sym_map_end = Align(sym.addr + sym.len, page_size);
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if (map_end < sym_map_start) {
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if (map_start < map_end) {
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InsertMap(*maps, MapEntry(map_start, map_end - map_start, map_start, dso, false, 0));
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}
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map_start = sym_map_start;
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}
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if (map_end < sym_map_end) {
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map_end = sym_map_end;
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}
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}
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if (map_start < map_end) {
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InsertMap(*maps, MapEntry(map_start, map_end - map_start, map_start, dso, false, 0));
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}
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}
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Dso* ThreadTree::FindUserDsoOrNew(const std::string& filename, uint64_t start_addr,
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DsoType dso_type) {
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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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std::unique_ptr<Dso> dso = Dso::CreateDso(dso_type, filename, force_64bit);
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auto pair = user_dso_tree_.insert(std::make_pair(filename, std::move(dso)));
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CHECK(pair.second);
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it = pair.first;
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}
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return it->second.get();
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}
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void ThreadTree::AddSymbolsForProcess(int pid, std::vector<Symbol>* symbols) {
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auto name = GetSymbolMapDsoName(pid);
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auto dso = FindUserDsoOrNew(name, 0, DSO_SYMBOL_MAP_FILE);
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dso->SetSymbols(symbols);
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auto thread = FindThreadOrNew(pid, pid);
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AddThreadMapsForDsoSymbols(thread, dso);
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}
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const MapEntry* ThreadTree::AllocateMap(const MapEntry& entry) {
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map_storage_.emplace_back(new MapEntry(entry));
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return map_storage_.back().get();
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}
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static MapEntry RemoveFirstPartOfMapEntry(const MapEntry* entry, uint64_t new_start_addr) {
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MapEntry result = *entry;
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result.start_addr = new_start_addr;
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result.len -= result.start_addr - entry->start_addr;
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result.pgoff += result.start_addr - entry->start_addr;
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return result;
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}
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static MapEntry RemoveSecondPartOfMapEntry(const MapEntry* entry, uint64_t new_len) {
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MapEntry result = *entry;
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result.len = new_len;
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return result;
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}
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// Insert a new map entry in a MapSet. If some existing map entries overlap the new map entry,
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// then remove the overlapped parts.
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void ThreadTree::InsertMap(MapSet& maps, const MapEntry& entry) {
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std::map<uint64_t, const MapEntry*>& map = maps.maps;
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auto it = map.lower_bound(entry.start_addr);
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// Remove overlapped entry with start_addr < entry.start_addr.
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if (it != map.begin()) {
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auto it2 = it;
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--it2;
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if (it2->second->get_end_addr() > entry.get_end_addr()) {
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map.emplace(entry.get_end_addr(),
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AllocateMap(RemoveFirstPartOfMapEntry(it2->second, entry.get_end_addr())));
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}
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if (it2->second->get_end_addr() > entry.start_addr) {
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it2->second =
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AllocateMap(RemoveSecondPartOfMapEntry(it2->second, entry.start_addr - it2->first));
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}
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}
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// Remove overlapped entries with start_addr >= entry.start_addr.
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while (it != map.end() && it->second->get_end_addr() <= entry.get_end_addr()) {
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it = map.erase(it);
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}
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if (it != map.end() && it->second->start_addr < entry.get_end_addr()) {
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map.emplace(entry.get_end_addr(),
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AllocateMap(RemoveFirstPartOfMapEntry(it->second, entry.get_end_addr())));
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map.erase(it);
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}
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// Insert the new entry.
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map.emplace(entry.start_addr, AllocateMap(entry));
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maps.version++;
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}
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const MapEntry* MapSet::FindMapByAddr(uint64_t addr) const {
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auto it = maps.upper_bound(addr);
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if (it != maps.begin()) {
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--it;
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if (it->second->get_end_addr() > addr) {
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return it->second;
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}
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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, bool in_kernel) {
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const MapEntry* result = nullptr;
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if (!in_kernel) {
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result = thread->maps->FindMapByAddr(ip);
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} else {
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result = kernel_maps_.FindMapByAddr(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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const MapEntry* result = thread->maps->FindMapByAddr(ip);
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if (result != nullptr) {
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return result;
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}
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result = kernel_maps_.FindMapByAddr(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, uint64_t* pvaddr_in_file,
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Dso** pdso) {
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uint64_t vaddr_in_file = 0;
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const Symbol* symbol = nullptr;
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Dso* dso = map->dso;
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if (map->flags & map_flags::PROT_JIT_SYMFILE_MAP) {
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vaddr_in_file = ip;
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} else {
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vaddr_in_file = dso->IpToVaddrInFile(ip, map->start_addr, map->pgoff);
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}
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symbol = dso->FindSymbol(vaddr_in_file);
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if (symbol == nullptr && dso->type() == DSO_KERNEL_MODULE) {
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// If the ip address hits the vmlinux, or hits a kernel module, but we can't find its symbol
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// in the kernel module file, then find its symbol in /proc/kallsyms or vmlinux.
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vaddr_in_file = ip;
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dso = FindKernelDsoOrNew();
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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("%s%s[+%" PRIx64 "]",
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(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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kernel_maps_.maps.clear();
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map_storage_.clear();
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}
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void ThreadTree::AddDsoInfo(FileFeature& file) {
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DsoType dso_type = file.type;
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Dso* dso = nullptr;
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if (dso_type == DSO_KERNEL) {
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dso = FindKernelDsoOrNew();
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} else if (dso_type == DSO_KERNEL_MODULE) {
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dso = FindKernelModuleDsoOrNew(file.path, 0, 0);
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} else {
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dso = FindUserDsoOrNew(file.path, 0, dso_type);
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}
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dso->SetMinExecutableVaddr(file.min_vaddr, file.file_offset_of_min_vaddr);
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dso->SetSymbols(&file.symbols);
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for (uint64_t offset : file.dex_file_offsets) {
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dso->AddDexFileOffset(offset);
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}
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}
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void ThreadTree::AddDexFileOffset(const std::string& file_path, uint64_t dex_file_offset) {
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Dso* dso = FindUserDsoOrNew(file_path, 0, DSO_DEX_FILE);
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dso->AddDexFileOffset(dex_file_offset);
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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, r.filename);
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} else {
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AddThreadMap(r.data->pid, r.data->tid, r.data->addr, r.data->len, r.data->pgoff, 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, r.filename);
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} else {
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std::string filename =
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(r.filename == DEFAULT_EXECNAME_FOR_THREAD_MMAP) ? "[unknown]" : r.filename;
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AddThreadMap(r.data->pid, r.data->tid, r.data->addr, r.data->len, r.data->pgoff, filename,
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r.data->prot);
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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() == PERF_RECORD_EXIT) {
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const ExitRecord& r = *static_cast<const ExitRecord*>(&record);
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ExitThread(r.data->pid, r.data->tid);
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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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if (kernel_dso_) {
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result.push_back(kernel_dso_.get());
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}
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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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} // namespace simpleperf
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