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/*
* Copyright (C) 2015 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.
*/
#ifndef SIMPLE_PERF_DSO_H_
#define SIMPLE_PERF_DSO_H_
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include <android-base/test_utils.h>
#include "build_id.h"
#include "read_elf.h"
struct Symbol {
uint64_t addr;
// TODO: make len uint32_t.
uint64_t len;
Symbol(const std::string& name, uint64_t addr, uint64_t len);
const char* Name() const { return name_; }
const char* DemangledName() const;
bool HasDumpId() const {
return dump_id_ != UINT_MAX;
}
bool GetDumpId(uint32_t* pdump_id) const {
if (!HasDumpId()) {
return false;
}
*pdump_id = dump_id_;
return true;
}
static bool CompareByDumpId(const Symbol* s1, const Symbol* s2) {
uint32_t id1 = UINT_MAX;
s1->GetDumpId(&id1);
uint32_t id2 = UINT_MAX;
s2->GetDumpId(&id2);
return id1 < id2;
}
static bool CompareByAddr(const Symbol* s1, const Symbol* s2) {
return s1->addr < s2->addr;
}
static bool CompareValueByAddr(const Symbol& s1, const Symbol& s2) {
return s1.addr < s2.addr;
}
private:
const char* name_;
mutable const char* demangled_name_;
mutable uint32_t dump_id_;
friend class Dso;
};
enum DsoType {
DSO_KERNEL,
DSO_KERNEL_MODULE,
DSO_ELF_FILE,
};
struct KernelSymbol;
struct ElfFileSymbol;
class Dso {
public:
static void SetDemangle(bool demangle);
static std::string Demangle(const std::string& name);
static bool SetSymFsDir(const std::string& symfs_dir);
static void SetVmlinux(const std::string& vmlinux);
static void SetKallsyms(std::string kallsyms) {
if (!kallsyms.empty()) {
kallsyms_ = std::move(kallsyms);
}
}
static void ReadKernelSymbolsFromProc() {
read_kernel_symbols_from_proc_ = true;
}
static void SetBuildIds(
const std::vector<std::pair<std::string, BuildId>>& build_ids);
static BuildId FindExpectedBuildIdForPath(const std::string& path);
static void SetVdsoFile(std::unique_ptr<TemporaryFile> vdso_file, bool is_64bit);
static std::unique_ptr<Dso> CreateDso(DsoType dso_type, const std::string& dso_path,
bool force_64bit = false);
~Dso();
DsoType type() const { return type_; }
// Return the path recorded in perf.data.
const std::string& Path() const { return path_; }
// Return the path containing symbol table and debug information.
const std::string& GetDebugFilePath() const { return debug_file_path_; }
// Return the file name without directory info.
const std::string& FileName() const { return file_name_; }
bool HasDumpId() {
return dump_id_ != UINT_MAX;
}
bool GetDumpId(uint32_t* pdump_id) {
if (!HasDumpId()) {
return false;
}
*pdump_id = dump_id_;
return true;
}
uint32_t CreateDumpId();
uint32_t CreateSymbolDumpId(const Symbol* symbol);
// Return the minimum virtual address in program header.
uint64_t MinVirtualAddress();
void SetMinVirtualAddress(uint64_t min_vaddr) { min_vaddr_ = min_vaddr; }
const Symbol* FindSymbol(uint64_t vaddr_in_dso);
const std::vector<Symbol>& GetSymbols();
void SetSymbols(std::vector<Symbol>* symbols);
// Create a symbol for a virtual address which can't find a corresponding
// symbol in symbol table.
void AddUnknownSymbol(uint64_t vaddr_in_dso, const std::string& name);
private:
static bool demangle_;
static std::string symfs_dir_;
static std::string vmlinux_;
static std::string kallsyms_;
static bool read_kernel_symbols_from_proc_;
static std::unordered_map<std::string, BuildId> build_id_map_;
static size_t dso_count_;
static uint32_t g_dump_id_;
static std::unique_ptr<TemporaryFile> vdso_64bit_;
static std::unique_ptr<TemporaryFile> vdso_32bit_;
Dso(DsoType type, const std::string& path, bool force_64bit);
void Load();
bool LoadKernel();
bool LoadKernelModule();
bool LoadElfFile();
bool LoadEmbeddedElfFile();
void FixupSymbolLength();
BuildId GetExpectedBuildId();
bool CheckReadSymbolResult(ElfStatus result, const std::string& filename);
const DsoType type_;
// path of the shared library used by the profiled program
const std::string path_;
// path of the shared library having symbol table and debug information
// It is the same as path_, or has the same build id as path_.
std::string debug_file_path_;
// File name of the shared library, got by removing directories in path_.
std::string file_name_;
uint64_t min_vaddr_;
std::vector<Symbol> symbols_;
// unknown symbols are like [libc.so+0x1234].
std::unordered_map<uint64_t, Symbol> unknown_symbols_;
bool is_loaded_;
// Used to identify current dso if it needs to be dumped.
uint32_t dump_id_;
// Used to assign dump_id for symbols in current dso.
uint32_t symbol_dump_id_;
};
const char* DsoTypeToString(DsoType dso_type);
#endif // SIMPLE_PERF_DSO_H_
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