1 //===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef LLVM_DEBUGINFO_DWARFFORMVALUE_H
11 #define LLVM_DEBUGINFO_DWARFFORMVALUE_H
13 #include "llvm/ADT/ArrayRef.h"
14 #include "llvm/ADT/Optional.h"
15 #include "llvm/Support/DataExtractor.h"
22 class DWARFFormValue {
39 ValueType() : data(nullptr) {
51 uint16_t Form; // Form for this value.
52 ValueType Value; // Contains all data for the form.
55 DWARFFormValue(uint16_t Form = 0) : Form(Form) {}
56 uint16_t getForm() const { return Form; }
57 bool isFormClass(FormClass FC) const;
59 void dump(raw_ostream &OS, const DWARFUnit *U) const;
61 /// \brief extracts a value in data at offset *offset_ptr.
63 /// The passed DWARFUnit is allowed to be nullptr, in which
64 /// case no relocation processing will be performed and some
65 /// kind of forms that depend on Unit information are disallowed.
66 /// \returns whether the extraction succeeded.
67 bool extractValue(DataExtractor data, uint32_t *offset_ptr,
69 bool isInlinedCStr() const {
70 return Value.data != nullptr && Value.data == (const uint8_t*)Value.cstr;
73 /// getAsFoo functions below return the extracted value as Foo if only
74 /// DWARFFormValue has form class is suitable for representing Foo.
75 Optional<uint64_t> getAsReference(const DWARFUnit *U) const;
76 Optional<uint64_t> getAsUnsignedConstant() const;
77 Optional<int64_t> getAsSignedConstant() const;
78 Optional<const char *> getAsCString(const DWARFUnit *U) const;
79 Optional<uint64_t> getAsAddress(const DWARFUnit *U) const;
80 Optional<uint64_t> getAsSectionOffset() const;
81 Optional<ArrayRef<uint8_t>> getAsBlock() const;
83 bool skipValue(DataExtractor debug_info_data, uint32_t *offset_ptr,
84 const DWARFUnit *u) const;
85 static bool skipValue(uint16_t form, DataExtractor debug_info_data,
86 uint32_t *offset_ptr, const DWARFUnit *u);
88 static ArrayRef<uint8_t> getFixedFormSizes(uint8_t AddrSize,
91 void dumpString(raw_ostream &OS, const DWARFUnit *U) const;