/*
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* Copyright (c) 2016 GitHub, Inc.
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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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#pragma once
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#include <algorithm>
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#include <memory>
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#include <string>
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#include <sys/types.h>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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#include "bcc_syms.h"
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#include "file_desc.h"
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#include "ns_guard.h"
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class ProcStat {
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std::string procfs_;
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ino_t inode_;
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ino_t getinode_();
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public:
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ProcStat(int pid);
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bool is_stale();
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void reset() { inode_ = getinode_(); }
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};
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class SymbolCache {
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public:
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virtual ~SymbolCache() = default;
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virtual void refresh() = 0;
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virtual bool resolve_addr(uint64_t addr, struct bcc_symbol *sym, bool demangle = true) = 0;
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virtual bool resolve_name(const char *module, const char *name,
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uint64_t *addr) = 0;
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};
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class KSyms : SymbolCache {
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struct Symbol {
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Symbol(const char *name, uint64_t addr) : name(name), addr(addr) {}
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std::string name;
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uint64_t addr;
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bool operator<(const Symbol &rhs) const { return addr < rhs.addr; }
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};
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std::vector<Symbol> syms_;
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std::unordered_map<std::string, uint64_t> symnames_;
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static void _add_symbol(const char *, uint64_t, void *);
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public:
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virtual bool resolve_addr(uint64_t addr, struct bcc_symbol *sym, bool demangle = true);
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virtual bool resolve_name(const char *unused, const char *name,
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uint64_t *addr);
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virtual void refresh();
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};
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class ProcSyms : SymbolCache {
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struct Symbol {
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Symbol(const std::string *name, uint64_t start, uint64_t size)
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: name(name), start(start), size(size) {}
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const std::string *name;
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uint64_t start;
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uint64_t size;
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bool operator<(const struct Symbol& rhs) const {
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return start < rhs.start;
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}
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};
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enum class ModuleType {
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UNKNOWN,
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EXEC,
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SO,
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PERF_MAP,
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VDSO
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};
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struct Module {
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struct Range {
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uint64_t start;
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uint64_t end;
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uint64_t file_offset;
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Range(uint64_t s, uint64_t e, uint64_t f)
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: start(s), end(e), file_offset(f) {}
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};
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Module(const char *name, ProcMountNS *mount_ns,
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struct bcc_symbol_option *option);
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std::string name_;
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std::vector<Range> ranges_;
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bool loaded_;
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ProcMountNS *mount_ns_;
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bcc_symbol_option *symbol_option_;
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ModuleType type_;
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// The file offset within the ELF of the SO's first text section.
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uint64_t elf_so_offset_;
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uint64_t elf_so_addr_;
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std::unordered_set<std::string> symnames_;
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std::vector<Symbol> syms_;
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void load_sym_table();
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bool contains(uint64_t addr, uint64_t &offset) const;
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uint64_t start() const { return ranges_.begin()->start; }
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bool find_addr(uint64_t offset, struct bcc_symbol *sym);
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bool find_name(const char *symname, uint64_t *addr);
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static int _add_symbol(const char *symname, uint64_t start, uint64_t size,
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void *p);
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};
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int pid_;
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std::vector<Module> modules_;
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ProcStat procstat_;
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std::unique_ptr<ProcMountNS> mount_ns_instance_;
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bcc_symbol_option symbol_option_;
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static int _add_load_sections(uint64_t v_addr, uint64_t mem_sz,
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uint64_t file_offset, void *payload);
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static int _add_module(const char *, uint64_t, uint64_t, uint64_t, bool,
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void *);
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void load_exe();
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void load_modules();
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public:
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ProcSyms(int pid, struct bcc_symbol_option *option = nullptr);
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virtual void refresh();
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virtual bool resolve_addr(uint64_t addr, struct bcc_symbol *sym, bool demangle = true);
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virtual bool resolve_name(const char *module, const char *name,
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uint64_t *addr);
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};
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