| // -*- mode: c++ -*- |
| |
| // Copyright (c) 2010 Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com> |
| |
| // Add DWARF debugging information to a Breakpad symbol file. This |
| // file defines the DwarfCUToModule class, which accepts parsed DWARF |
| // data and populates a google_breakpad::Module with the results; the |
| // Module can then write its contents as a Breakpad symbol file. |
| |
| #ifndef COMMON_LINUX_DWARF_CU_TO_MODULE_H__ |
| #define COMMON_LINUX_DWARF_CU_TO_MODULE_H__ |
| |
| #include <string> |
| |
| #include "common/language.h" |
| #include "common/module.h" |
| #include "common/dwarf/bytereader.h" |
| #include "common/dwarf/dwarf2diehandler.h" |
| #include "common/dwarf/dwarf2reader.h" |
| #include "common/scoped_ptr.h" |
| #include "common/using_std_string.h" |
| |
| namespace google_breakpad { |
| |
| using dwarf2reader::DwarfAttribute; |
| using dwarf2reader::DwarfForm; |
| using dwarf2reader::DwarfLanguage; |
| using dwarf2reader::DwarfTag; |
| |
| // Populate a google_breakpad::Module with DWARF debugging information. |
| // |
| // An instance of this class can be provided as a handler to a |
| // dwarf2reader::DIEDispatcher, which can in turn be a handler for a |
| // dwarf2reader::CompilationUnit DWARF parser. The handler uses the results |
| // of parsing to populate a google_breakpad::Module with source file, |
| // function, and source line information. |
| class DwarfCUToModule: public dwarf2reader::RootDIEHandler { |
| struct FilePrivate; |
| public: |
| // Information global to the DWARF-bearing file we are processing, |
| // for use by DwarfCUToModule. Each DwarfCUToModule instance deals |
| // with a single compilation unit within the file, but information |
| // global to the whole file is held here. The client is responsible |
| // for filling it in appropriately (except for the 'file_private' |
| // field, which the constructor and destructor take care of), and |
| // then providing it to the DwarfCUToModule instance for each |
| // compilation unit we process in that file. Set HANDLE_INTER_CU_REFS |
| // to true to handle debugging symbols with DW_FORM_ref_addr entries. |
| class FileContext { |
| public: |
| FileContext(const string &filename, |
| Module *module, |
| bool handle_inter_cu_refs); |
| ~FileContext(); |
| |
| // Add CONTENTS of size LENGTH to the section map as NAME. |
| void AddSectionToSectionMap(const string& name, |
| const char* contents, |
| uint64 length); |
| |
| // Clear the section map for testing. |
| void ClearSectionMapForTest(); |
| |
| const dwarf2reader::SectionMap& section_map() const; |
| |
| private: |
| friend class DwarfCUToModule; |
| |
| // Clears all the Specifications if HANDLE_INTER_CU_REFS_ is false. |
| void ClearSpecifications(); |
| |
| // Given an OFFSET and a CU that starts at COMPILATION_UNIT_START, returns |
| // true if this is an inter-compilation unit reference that is not being |
| // handled. |
| bool IsUnhandledInterCUReference(uint64 offset, |
| uint64 compilation_unit_start) const; |
| |
| // The name of this file, for use in error messages. |
| const string filename_; |
| |
| // A map of this file's sections, used for finding other DWARF |
| // sections that the .debug_info section may refer to. |
| dwarf2reader::SectionMap section_map_; |
| |
| // The Module to which we're contributing definitions. |
| Module *module_; |
| |
| // True if we are handling references between compilation units. |
| const bool handle_inter_cu_refs_; |
| |
| // Inter-compilation unit data used internally by the handlers. |
| scoped_ptr<FilePrivate> file_private_; |
| }; |
| |
| // An abstract base class for handlers that handle DWARF line data |
| // for DwarfCUToModule. DwarfCUToModule could certainly just use |
| // dwarf2reader::LineInfo itself directly, but decoupling things |
| // this way makes unit testing a little easier. |
| class LineToModuleHandler { |
| public: |
| LineToModuleHandler() { } |
| virtual ~LineToModuleHandler() { } |
| |
| // Called at the beginning of a new compilation unit, prior to calling |
| // ReadProgram(). compilation_dir will indicate the path that the |
| // current compilation unit was compiled in, consistent with the |
| // DW_AT_comp_dir DIE. |
| virtual void StartCompilationUnit(const string& compilation_dir) = 0; |
| |
| // Populate MODULE and LINES with source file names and code/line |
| // mappings, given a pointer to some DWARF line number data |
| // PROGRAM, and an overestimate of its size. Add no zero-length |
| // lines to LINES. |
| virtual void ReadProgram(const char *program, uint64 length, |
| Module *module, vector<Module::Line> *lines) = 0; |
| }; |
| |
| // The interface DwarfCUToModule uses to report warnings. The member |
| // function definitions for this class write messages to stderr, but |
| // you can override them if you'd like to detect or report these |
| // conditions yourself. |
| class WarningReporter { |
| public: |
| // Warn about problems in the DWARF file FILENAME, in the |
| // compilation unit at OFFSET. |
| WarningReporter(const string &filename, uint64 cu_offset) |
| : filename_(filename), cu_offset_(cu_offset), printed_cu_header_(false), |
| printed_unpaired_header_(false), |
| uncovered_warnings_enabled_(false) { } |
| virtual ~WarningReporter() { } |
| |
| // Set the name of the compilation unit we're processing to NAME. |
| virtual void SetCUName(const string &name) { cu_name_ = name; } |
| |
| // Accessor and setter for uncovered_warnings_enabled_. |
| // UncoveredFunction and UncoveredLine only report a problem if that is |
| // true. By default, these warnings are disabled, because those |
| // conditions occur occasionally in healthy code. |
| virtual bool uncovered_warnings_enabled() const { |
| return uncovered_warnings_enabled_; |
| } |
| virtual void set_uncovered_warnings_enabled(bool value) { |
| uncovered_warnings_enabled_ = value; |
| } |
| |
| // A DW_AT_specification in the DIE at OFFSET refers to a DIE we |
| // haven't processed yet, or that wasn't marked as a declaration, |
| // at TARGET. |
| virtual void UnknownSpecification(uint64 offset, uint64 target); |
| |
| // A DW_AT_abstract_origin in the DIE at OFFSET refers to a DIE we |
| // haven't processed yet, or that wasn't marked as inline, at TARGET. |
| virtual void UnknownAbstractOrigin(uint64 offset, uint64 target); |
| |
| // We were unable to find the DWARF section named SECTION_NAME. |
| virtual void MissingSection(const string §ion_name); |
| |
| // The CU's DW_AT_stmt_list offset OFFSET is bogus. |
| virtual void BadLineInfoOffset(uint64 offset); |
| |
| // FUNCTION includes code covered by no line number data. |
| virtual void UncoveredFunction(const Module::Function &function); |
| |
| // Line number NUMBER in LINE_FILE, of length LENGTH, includes code |
| // covered by no function. |
| virtual void UncoveredLine(const Module::Line &line); |
| |
| // The DW_TAG_subprogram DIE at OFFSET has no name specified directly |
| // in the DIE, nor via a DW_AT_specification or DW_AT_abstract_origin |
| // link. |
| virtual void UnnamedFunction(uint64 offset); |
| |
| // __cxa_demangle() failed to demangle INPUT. |
| virtual void DemangleError(const string &input, int error); |
| |
| // The DW_FORM_ref_addr at OFFSET to TARGET was not handled because |
| // FilePrivate did not retain the inter-CU specification data. |
| virtual void UnhandledInterCUReference(uint64 offset, uint64 target); |
| |
| uint64 cu_offset() const { |
| return cu_offset_; |
| } |
| |
| protected: |
| const string filename_; |
| const uint64 cu_offset_; |
| string cu_name_; |
| bool printed_cu_header_; |
| bool printed_unpaired_header_; |
| bool uncovered_warnings_enabled_; |
| |
| private: |
| // Print a per-CU heading, once. |
| void CUHeading(); |
| // Print an unpaired function/line heading, once. |
| void UncoveredHeading(); |
| }; |
| |
| // Create a DWARF debugging info handler for a compilation unit |
| // within FILE_CONTEXT. This uses information received from the |
| // dwarf2reader::CompilationUnit DWARF parser to populate |
| // FILE_CONTEXT->module. Use LINE_READER to handle the compilation |
| // unit's line number data. Use REPORTER to report problems with the |
| // data we find. |
| DwarfCUToModule(FileContext *file_context, |
| LineToModuleHandler *line_reader, |
| WarningReporter *reporter); |
| ~DwarfCUToModule(); |
| |
| void ProcessAttributeSigned(enum DwarfAttribute attr, |
| enum DwarfForm form, |
| int64 data); |
| void ProcessAttributeUnsigned(enum DwarfAttribute attr, |
| enum DwarfForm form, |
| uint64 data); |
| void ProcessAttributeString(enum DwarfAttribute attr, |
| enum DwarfForm form, |
| const string &data); |
| bool EndAttributes(); |
| DIEHandler *FindChildHandler(uint64 offset, enum DwarfTag tag); |
| |
| // Assign all our source Lines to the Functions that cover their |
| // addresses, and then add them to module_. |
| void Finish(); |
| |
| bool StartCompilationUnit(uint64 offset, uint8 address_size, |
| uint8 offset_size, uint64 cu_length, |
| uint8 dwarf_version); |
| bool StartRootDIE(uint64 offset, enum DwarfTag tag); |
| |
| private: |
| // Used internally by the handler. Full definitions are in |
| // dwarf_cu_to_module.cc. |
| struct CUContext; |
| struct DIEContext; |
| struct Specification; |
| class GenericDIEHandler; |
| class FuncHandler; |
| class NamedScopeHandler; |
| |
| // A map from section offsets to specifications. |
| typedef map<uint64, Specification> SpecificationByOffset; |
| |
| // Set this compilation unit's source language to LANGUAGE. |
| void SetLanguage(DwarfLanguage language); |
| |
| // Read source line information at OFFSET in the .debug_line |
| // section. Record source files in module_, but record source lines |
| // in lines_; we apportion them to functions in |
| // AssignLinesToFunctions. |
| void ReadSourceLines(uint64 offset); |
| |
| // Assign the lines in lines_ to the individual line lists of the |
| // functions in functions_. (DWARF line information maps an entire |
| // compilation unit at a time, and gives no indication of which |
| // lines belong to which functions, beyond their addresses.) |
| void AssignLinesToFunctions(); |
| |
| // The only reason cu_context_ and child_context_ are pointers is |
| // that we want to keep their definitions private to |
| // dwarf_cu_to_module.cc, instead of listing them all here. They are |
| // owned by this DwarfCUToModule: the constructor sets them, and the |
| // destructor deletes them. |
| |
| // The handler to use to handle line number data. |
| LineToModuleHandler *line_reader_; |
| |
| // This compilation unit's context. |
| scoped_ptr<CUContext> cu_context_; |
| |
| // A context for our children. |
| scoped_ptr<DIEContext> child_context_; |
| |
| // True if this compilation unit has source line information. |
| bool has_source_line_info_; |
| |
| // The offset of this compilation unit's line number information in |
| // the .debug_line section. |
| uint64 source_line_offset_; |
| |
| // The line numbers we have seen thus far. We accumulate these here |
| // during parsing. Then, in Finish, we call AssignLinesToFunctions |
| // to dole them out to the appropriate functions. |
| vector<Module::Line> lines_; |
| }; |
| |
| } // namespace google_breakpad |
| |
| #endif // COMMON_LINUX_DWARF_CU_TO_MODULE_H__ |