1 //===-- DWARFAbbreviationDeclaration.cpp ----------------------------------===// 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 #include "DWARFAbbreviationDeclaration.h" 11 #include "llvm/Support/Dwarf.h" 12 #include "llvm/Support/Format.h" 13 #include "llvm/Support/raw_ostream.h" 14 using namespace llvm; 15 using namespace dwarf; 16 17 void DWARFAbbreviationDeclaration::clear() { 18 Code = 0; 19 Tag = 0; 20 HasChildren = false; 21 AttributeSpecs.clear(); 22 } 23 24 DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration() { 25 clear(); 26 } 27 28 bool 29 DWARFAbbreviationDeclaration::extract(DataExtractor Data, uint32_t* OffsetPtr) { 30 clear(); 31 Code = Data.getULEB128(OffsetPtr); 32 if (Code == 0) { 33 return false; 34 } 35 Tag = Data.getULEB128(OffsetPtr); 36 uint8_t ChildrenByte = Data.getU8(OffsetPtr); 37 HasChildren = (ChildrenByte == DW_CHILDREN_yes); 38 39 while (true) { 40 uint32_t CurOffset = *OffsetPtr; 41 uint16_t Attr = Data.getULEB128(OffsetPtr); 42 if (CurOffset == *OffsetPtr) { 43 clear(); 44 return false; 45 } 46 CurOffset = *OffsetPtr; 47 uint16_t Form = Data.getULEB128(OffsetPtr); 48 if (CurOffset == *OffsetPtr) { 49 clear(); 50 return false; 51 } 52 if (Attr == 0 && Form == 0) 53 break; 54 AttributeSpecs.push_back(AttributeSpec(Attr, Form)); 55 } 56 57 if (Tag == 0) { 58 clear(); 59 return false; 60 } 61 return true; 62 } 63 64 void DWARFAbbreviationDeclaration::dump(raw_ostream &OS) const { 65 const char *tagString = TagString(getTag()); 66 OS << '[' << getCode() << "] "; 67 if (tagString) 68 OS << tagString; 69 else 70 OS << format("DW_TAG_Unknown_%x", getTag()); 71 OS << "\tDW_CHILDREN_" << (hasChildren() ? "yes" : "no") << '\n'; 72 for (const AttributeSpec &Spec : AttributeSpecs) { 73 OS << '\t'; 74 const char *attrString = AttributeString(Spec.Attr); 75 if (attrString) 76 OS << attrString; 77 else 78 OS << format("DW_AT_Unknown_%x", Spec.Attr); 79 OS << '\t'; 80 const char *formString = FormEncodingString(Spec.Form); 81 if (formString) 82 OS << formString; 83 else 84 OS << format("DW_FORM_Unknown_%x", Spec.Form); 85 OS << '\n'; 86 } 87 OS << '\n'; 88 } 89 90 uint32_t 91 DWARFAbbreviationDeclaration::findAttributeIndex(uint16_t attr) const { 92 for (uint32_t i = 0, e = AttributeSpecs.size(); i != e; ++i) { 93 if (AttributeSpecs[i].Attr == attr) 94 return i; 95 } 96 return -1U; 97 } 98
