140 lines
4.3 KiB
C++
140 lines
4.3 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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#ifndef FOLLY_EXPERIMENTAL_SYMBOLIZER_ELF_H_
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#error This file must be included from Elf.h
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#endif
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namespace folly {
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namespace symbolizer {
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template <class Fn>
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const ElfPhdr* ElfFile::iterateProgramHeaders(Fn fn) const
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noexcept(is_nothrow_invocable_v<Fn, ElfPhdr const&>) {
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// there exist ELF binaries which execute correctly, but have invalid internal
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// offset(s) to program/section headers; most probably due to invalid
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// stripping of symbols
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if (elfHeader().e_phoff + sizeof(ElfPhdr) >= length_) {
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return nullptr;
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}
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const ElfPhdr* ptr = &at<ElfPhdr>(elfHeader().e_phoff);
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for (size_t i = 0; i < elfHeader().e_phnum; i++, ptr++) {
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if (fn(*ptr)) {
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return ptr;
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}
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}
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return nullptr;
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}
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template <class Fn>
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const ElfShdr* ElfFile::iterateSections(Fn fn) const
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noexcept(is_nothrow_invocable_v<Fn, ElfShdr const&>) {
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// there exist ELF binaries which execute correctly, but have invalid internal
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// offset(s) to program/section headers; most probably due to invalid
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// stripping of symbols
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if (elfHeader().e_shoff + sizeof(ElfShdr) >= length_) {
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return nullptr;
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}
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const ElfShdr* ptr = &at<ElfShdr>(elfHeader().e_shoff);
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for (size_t i = 0; i < elfHeader().e_shnum; i++, ptr++) {
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if (fn(*ptr)) {
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return ptr;
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}
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}
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return nullptr;
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}
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template <class Fn>
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const ElfShdr* ElfFile::iterateSectionsWithType(uint32_t type, Fn fn) const
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noexcept(is_nothrow_invocable_v<Fn, ElfShdr const&>) {
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return iterateSections(
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[&](const ElfShdr& sh) { return sh.sh_type == type && fn(sh); });
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}
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template <class Fn>
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const ElfShdr* ElfFile::iterateSectionsWithTypes(
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std::initializer_list<uint32_t> types, Fn fn) const
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noexcept(is_nothrow_invocable_v<Fn, ElfShdr const&>) {
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return iterateSections([&](const ElfShdr& sh) {
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auto const it = std::find(types.begin(), types.end(), sh.sh_type);
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return it != types.end() && fn(sh);
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});
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}
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template <class Fn>
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const char* ElfFile::iterateStrings(const ElfShdr& stringTable, Fn fn) const
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noexcept(is_nothrow_invocable_v<Fn, const char*>) {
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validateStringTable(stringTable);
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const char* start = file_ + stringTable.sh_offset;
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const char* end = start + stringTable.sh_size;
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const char* ptr = start;
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while (ptr != end && !fn(ptr)) {
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ptr += strlen(ptr) + 1;
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}
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return ptr != end ? ptr : nullptr;
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}
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template <class Fn>
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const ElfSym* ElfFile::iterateSymbols(const ElfShdr& section, Fn fn) const
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noexcept(is_nothrow_invocable_v<Fn, ElfSym const&>) {
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FOLLY_SAFE_CHECK(
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section.sh_entsize == sizeof(ElfSym),
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"invalid entry size in symbol table");
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const ElfSym* sym = &at<ElfSym>(section.sh_offset);
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const ElfSym* end = sym + (section.sh_size / section.sh_entsize);
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while (sym < end) {
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if (fn(*sym)) {
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return sym;
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}
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++sym;
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}
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return nullptr;
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}
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template <class Fn>
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const ElfSym* ElfFile::iterateSymbolsWithType(
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const ElfShdr& section, uint32_t type, Fn fn) const
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noexcept(is_nothrow_invocable_v<Fn, ElfSym const&>) {
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// N.B. st_info has the same representation on 32- and 64-bit platforms
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return iterateSymbols(section, [&](const ElfSym& sym) -> bool {
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return ELF32_ST_TYPE(sym.st_info) == type && fn(sym);
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});
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}
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template <class Fn>
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const ElfSym* ElfFile::iterateSymbolsWithTypes(
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const ElfShdr& section, std::initializer_list<uint32_t> types, Fn fn) const
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noexcept(is_nothrow_invocable_v<Fn, ElfSym const&>) {
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// N.B. st_info has the same representation on 32- and 64-bit platforms
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return iterateSymbols(section, [&](const ElfSym& sym) -> bool {
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auto const elfType = ELF32_ST_TYPE(sym.st_info);
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auto const it = std::find(types.begin(), types.end(), elfType);
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return it != types.end() && fn(sym);
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});
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}
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} // namespace symbolizer
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} // namespace folly
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