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author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-09-13 19:42:23 +0000 |
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committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-09-13 19:42:23 +0000 |
commit | 72c0d7fdd3d0930c7507060e96aec7d7429a8190 (patch) | |
tree | 78cea7afdfd25de5a88d35782530bc2e58049eb0 /lib/DebugInfo/DWARFFormValue.h | |
parent | 8c74f7f2991a10977fd5a003b2901b56eb2e19a8 (diff) | |
download | external_llvm-72c0d7fdd3d0930c7507060e96aec7d7429a8190.zip external_llvm-72c0d7fdd3d0930c7507060e96aec7d7429a8190.tar.gz external_llvm-72c0d7fdd3d0930c7507060e96aec7d7429a8190.tar.bz2 |
Sketch out a DWARF parser.
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
Diffstat (limited to 'lib/DebugInfo/DWARFFormValue.h')
-rw-r--r-- | lib/DebugInfo/DWARFFormValue.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/DebugInfo/DWARFFormValue.h b/lib/DebugInfo/DWARFFormValue.h new file mode 100644 index 0000000..c2bfb4f --- /dev/null +++ b/lib/DebugInfo/DWARFFormValue.h @@ -0,0 +1,79 @@ +//===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_DEBUGINFO_DWARFFORMVALUE_H +#define LLVM_DEBUGINFO_DWARFFORMVALUE_H + +#include "llvm/Support/DataExtractor.h" + +namespace llvm { + +class DWARFCompileUnit; +class raw_ostream; + +class DWARFFormValue { +public: + struct ValueType { + ValueType() : data(NULL) { + uval = 0; + } + + union { + uint64_t uval; + int64_t sval; + const char* cstr; + }; + const uint8_t* data; + }; + + enum { + eValueTypeInvalid = 0, + eValueTypeUnsigned, + eValueTypeSigned, + eValueTypeCStr, + eValueTypeBlock + }; + +private: + uint16_t Form; // Form for this value. + ValueType Value; // Contains all data for the form. + +public: + DWARFFormValue(uint16_t form = 0) : Form(form) {} + uint16_t getForm() const { return Form; } + const ValueType& value() const { return Value; } + void dump(raw_ostream &OS, const DataExtractor *debug_str_data, + const DWARFCompileUnit* cu) const; + bool extractValue(DataExtractor data, uint32_t *offset_ptr, + const DWARFCompileUnit *cu); + bool isInlinedCStr() const { + return Value.data != NULL && Value.data == (uint8_t*)Value.cstr; + } + const uint8_t *BlockData() const; + uint64_t getReference(const DWARFCompileUnit* cu) const; + + /// Resolve any compile unit specific references so that we don't need + /// the compile unit at a later time in order to work with the form + /// value. + bool resolveCompileUnitReferences(const DWARFCompileUnit* cu); + uint64_t getUnsigned() const { return Value.uval; } + int64_t getSigned() const { return Value.sval; } + const char *getAsCString(const DataExtractor *debug_str_data_ptr) const; + bool skipValue(DataExtractor debug_info_data, uint32_t *offset_ptr, + const DWARFCompileUnit *cu) const; + static bool skipValue(uint16_t form, DataExtractor debug_info_data, + uint32_t *offset_ptr, const DWARFCompileUnit *cu); + static bool isBlockForm(uint16_t form); + static bool isDataForm(uint16_t form); + static const uint8_t *getFixedFormSizesForAddressSize(uint8_t addr_size); +}; + +} + +#endif |