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4224be41d7
Bug: crashpad:30 Change-Id: Id2a6a1868103b0f4374816e58aab365a977b010d Reviewed-on: https://chromium-review.googlesource.com/508836 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Joshua Peraza <jperaza@chromium.org>
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
// Copyright 2017 The Crashpad Authors. All rights reserved.
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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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#ifndef CRASHPAD_SNAPSHOT_LINUX_ELF_SYMBOL_TABLE_READER_H_
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#define CRASHPAD_SNAPSHOT_LINUX_ELF_SYMBOL_TABLE_READER_H_
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#include <stdint.h>
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#include <string>
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#include "base/macros.h"
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#include "util/linux/address_types.h"
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#include "util/linux/process_memory_range.h"
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namespace crashpad {
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class ElfImageReader;
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//! \brief A reader for symbol tables in ELF images mapped into another process.
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class ElfSymbolTableReader {
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public:
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//! \brief Information about a symbol in a module's symbol table.
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struct SymbolInformation {
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//! \brief The address of the symbol as it exists in the symbol table, not
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//! adjusted for any load bias.
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LinuxVMAddress address;
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//! \brief The size of the symbol.
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LinuxVMSize size;
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//! \brief The section index that the symbol definition is in relation to.
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uint16_t shndx;
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//! \brief Specifies the type of symbol. Possible values include
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//! `STT_OBJECT`, `STT_FUNC`, etc.
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uint8_t type;
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//! \brief Specifies the default scope at which a symbol takes precedence.
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//! Possible values include `STB_LOCAL`, `STB_GLOBAL`, `STB_WEAK`, or
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//! OS/processor specific values.
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uint8_t binding;
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//! \brief Together with binding, can limit the visibility of a symbol to
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//! the module that defines it. Possible values include `STV_DEFAULT`,
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//! `STV_INTERNAL`, `STV_HIDDEN`, and `STV_PROTECTED`.
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uint8_t visibility;
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};
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// TODO(jperaza): Support using .hash and .gnu.hash sections to improve symbol
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// lookup.
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ElfSymbolTableReader(const ProcessMemoryRange* memory,
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ElfImageReader* elf_reader,
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LinuxVMAddress address);
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~ElfSymbolTableReader();
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//! \brief Lookup information about a symbol.
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//!
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//! \param[in] name The name of the symbol to search for.
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//! \param[out] info The symbol information, if found.
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//! \return `true` if the symbol is found.
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bool GetSymbol(const std::string& name, SymbolInformation* info);
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private:
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template <typename SymEnt>
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bool ScanSymbolTable(const std::string& name, SymbolInformation* info);
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const ProcessMemoryRange* const memory_; // weak
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ElfImageReader* const elf_reader_; // weak
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const LinuxVMAddress base_address_;
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DISALLOW_COPY_AND_ASSIGN(ElfSymbolTableReader);
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};
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} // namespace crashpad
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#endif // CRASHPAD_SNAPSHOT_LINUX_ELF_SYMBOL_TABLE_READER_H_
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