1 //===-- DWARFFormValue.h ----------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef LLVM_DEBUGINFO_DWARFFORMVALUE_H 11 #define LLVM_DEBUGINFO_DWARFFORMVALUE_H 12 13 #include "llvm/ADT/ArrayRef.h" 14 #include "llvm/ADT/Optional.h" 15 #include "llvm/Support/DataExtractor.h" 16 17 namespace llvm { 18 19 class DWARFUnit; 20 class raw_ostream; 21 22 class DWARFFormValue { 23 public: 24 enum FormClass { 25 FC_Unknown, 26 FC_Address, 27 FC_Block, 28 FC_Constant, 29 FC_String, 30 FC_Flag, 31 FC_Reference, 32 FC_Indirect, 33 FC_SectionOffset, 34 FC_Exprloc 35 }; 36 37 private: 38 struct ValueType { 39 ValueType() : data(nullptr) { 40 uval = 0; 41 } 42 43 union { 44 uint64_t uval; 45 int64_t sval; 46 const char* cstr; 47 }; 48 const uint8_t* data; 49 }; 50 51 uint16_t Form; // Form for this value. 52 ValueType Value; // Contains all data for the form. 53 54 public: 55 DWARFFormValue(uint16_t Form = 0) : Form(Form) {} 56 uint16_t getForm() const { return Form; } 57 bool isFormClass(FormClass FC) const; 58 59 void dump(raw_ostream &OS, const DWARFUnit *U) const; 60 bool extractValue(DataExtractor data, uint32_t *offset_ptr, 61 const DWARFUnit *u); 62 bool isInlinedCStr() const { 63 return Value.data != nullptr && Value.data == (const uint8_t*)Value.cstr; 64 } 65 66 /// getAsFoo functions below return the extracted value as Foo if only 67 /// DWARFFormValue has form class is suitable for representing Foo. 68 Optional<uint64_t> getAsReference(const DWARFUnit *U) const; 69 Optional<uint64_t> getAsUnsignedConstant() const; 70 Optional<const char *> getAsCString(const DWARFUnit *U) const; 71 Optional<uint64_t> getAsAddress(const DWARFUnit *U) const; 72 Optional<uint64_t> getAsSectionOffset() const; 73 74 bool skipValue(DataExtractor debug_info_data, uint32_t *offset_ptr, 75 const DWARFUnit *u) const; 76 static bool skipValue(uint16_t form, DataExtractor debug_info_data, 77 uint32_t *offset_ptr, const DWARFUnit *u); 78 79 static ArrayRef<uint8_t> getFixedFormSizes(uint8_t AddrSize, 80 uint16_t Version); 81 }; 82 83 } 84 85 #endif 86
