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This introduces a new library to LLVM: libDebugInfo. It will provide debug information parsing to LLVM. Much of the design and some of the code is taken from the LLDB project. It also contains an llvm-dwarfdump tool that can dump the abbrevs and DIEs from an object file. It can be used to write tests for DWARF input and output easily. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139627 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
//===-- DWARFCompileUnit.h --------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_DEBUGINFO_DWARFCOMPILEUNIT_H
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#define LLVM_DEBUGINFO_DWARFCOMPILEUNIT_H
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#include "DWARFDebugAbbrev.h"
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#include "DWARFDebugInfoEntry.h"
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#include <vector>
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namespace llvm {
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class DWARFContext;
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class raw_ostream;
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class DWARFCompileUnit {
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DWARFContext &Context;
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uint32_t Offset;
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uint32_t Length;
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uint16_t Version;
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const DWARFAbbreviationDeclarationSet *Abbrevs;
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uint8_t AddrSize;
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uint64_t BaseAddr;
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// The compile unit debug information entry item.
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std::vector<DWARFDebugInfoEntryMinimal> DieArray;
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public:
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DWARFCompileUnit(DWARFContext &context) : Context(context) {
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clear();
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}
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DWARFContext &getContext() const { return Context; }
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DataExtractor getDebugInfoExtractor() const;
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bool extract(DataExtractor debug_info, uint32_t* offset_ptr);
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uint32_t extract(uint32_t offset, DataExtractor debug_info_data,
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const DWARFAbbreviationDeclarationSet *abbrevs);
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/// extractDIEsIfNeeded - Parses a compile unit and indexes its DIEs if it
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/// hasn't already been done.
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size_t extractDIEsIfNeeded(bool cu_die_only);
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void clear();
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void dump(raw_ostream &OS);
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uint32_t getOffset() const { return Offset; }
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/// Size in bytes of the compile unit header.
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uint32_t getSize() const { return 11; }
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bool containsDIEOffset(uint32_t die_offset) const {
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return die_offset >= getFirstDIEOffset() &&
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die_offset < getNextCompileUnitOffset();
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}
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uint32_t getFirstDIEOffset() const { return Offset + getSize(); }
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uint32_t getNextCompileUnitOffset() const { return Offset + Length + 4; }
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/// Size in bytes of the .debug_info data associated with this compile unit.
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size_t getDebugInfoSize() const { return Length + 4 - getSize(); }
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uint32_t getLength() const { return Length; }
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uint16_t getVersion() const { return Version; }
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const DWARFAbbreviationDeclarationSet *getAbbreviations() const {
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return Abbrevs;
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}
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uint8_t getAddressByteSize() const { return AddrSize; }
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uint64_t getBaseAddress() const { return BaseAddr; }
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void setBaseAddress(uint64_t base_addr) {
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BaseAddr = base_addr;
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}
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/// setDIERelations - We read in all of the DIE entries into our flat list
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/// of DIE entries and now we need to go back through all of them and set the
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/// parent, sibling and child pointers for quick DIE navigation.
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void setDIERelations();
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void addDIE(DWARFDebugInfoEntryMinimal &die) {
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// The average bytes per DIE entry has been seen to be
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// around 14-20 so lets pre-reserve the needed memory for
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// our DIE entries accordingly. Search forward for "Compute
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// average bytes per DIE" to see #if'ed out code that does
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// that determination.
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// Only reserve the memory if we are adding children of
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// the main compile unit DIE. The compile unit DIE is always
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// the first entry, so if our size is 1, then we are adding
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// the first compile unit child DIE and should reserve
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// the memory.
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if (DieArray.empty())
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DieArray.reserve(getDebugInfoSize() / 14);
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DieArray.push_back(die);
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}
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};
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}
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#endif
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