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5c64f0995b
This change implements basic support for DWARF alternate sections proposal: http://www.dwarfstd.org/ShowIssue.php?issue=120604.1&type=open LLVM tools now understand new forms: DW_FORM_GNU_ref_alt and DW_FORM_GNU_strp_alt, which are used as references to .debug_info and .debug_str sections respectively, stored in a separate file, and possibly shared between different executables / shared objects. llvm-dwarfdump and llvm-symbolizer don't yet know how to access this alternate debug file (usually pointed by .gnu_debugaltlink section), but they can at lease properly parse and dump regular files, which refer to it. This change should fix crashes of llvm-dwarfdump and llvm-symbolizer on files produced by running "dwz" tool. Such files are already installed on some modern Linux distributions. llvm-svn: 237721
97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
//===-- DWARFFormValue.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_DWARFFORMVALUE_H
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#define LLVM_DEBUGINFO_DWARFFORMVALUE_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/Support/DataExtractor.h"
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namespace llvm {
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class DWARFUnit;
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class raw_ostream;
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class DWARFFormValue {
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public:
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enum FormClass {
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FC_Unknown,
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FC_Address,
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FC_Block,
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FC_Constant,
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FC_String,
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FC_Flag,
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FC_Reference,
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FC_Indirect,
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FC_SectionOffset,
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FC_Exprloc
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};
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private:
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struct ValueType {
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ValueType() : data(nullptr) {
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uval = 0;
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}
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union {
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uint64_t uval;
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int64_t sval;
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const char* cstr;
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};
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const uint8_t* data;
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};
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uint16_t Form; // Form for this value.
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ValueType Value; // Contains all data for the form.
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public:
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DWARFFormValue(uint16_t Form = 0) : Form(Form) {}
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uint16_t getForm() const { return Form; }
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bool isFormClass(FormClass FC) const;
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void dump(raw_ostream &OS, const DWARFUnit *U) const;
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/// \brief extracts a value in data at offset *offset_ptr.
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///
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/// The passed DWARFUnit is allowed to be nullptr, in which
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/// case no relocation processing will be performed and some
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/// kind of forms that depend on Unit information are disallowed.
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/// \returns whether the extraction succeeded.
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bool extractValue(DataExtractor data, uint32_t *offset_ptr,
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const DWARFUnit *u);
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bool isInlinedCStr() const {
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return Value.data != nullptr && Value.data == (const uint8_t*)Value.cstr;
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}
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/// getAsFoo functions below return the extracted value as Foo if only
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/// DWARFFormValue has form class is suitable for representing Foo.
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Optional<uint64_t> getAsReference(const DWARFUnit *U) const;
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Optional<uint64_t> getAsUnsignedConstant() const;
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Optional<int64_t> getAsSignedConstant() const;
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Optional<const char *> getAsCString(const DWARFUnit *U) const;
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Optional<uint64_t> getAsAddress(const DWARFUnit *U) const;
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Optional<uint64_t> getAsSectionOffset() const;
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Optional<ArrayRef<uint8_t>> getAsBlock() const;
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bool skipValue(DataExtractor debug_info_data, uint32_t *offset_ptr,
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const DWARFUnit *u) const;
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static bool skipValue(uint16_t form, DataExtractor debug_info_data,
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uint32_t *offset_ptr, const DWARFUnit *u);
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static ArrayRef<uint8_t> getFixedFormSizes(uint8_t AddrSize,
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uint16_t Version);
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private:
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void dumpString(raw_ostream &OS, const DWARFUnit *U) const;
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};
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}
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#endif
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