98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
//===-- DWARFAbbreviationDeclaration.cpp ----------------------------------===//
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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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#include "llvm/DebugInfo/DWARFAbbreviationDeclaration.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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using namespace dwarf;
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void DWARFAbbreviationDeclaration::clear() {
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Code = 0;
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Tag = 0;
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HasChildren = false;
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AttributeSpecs.clear();
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}
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DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration() {
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clear();
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}
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bool
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DWARFAbbreviationDeclaration::extract(DataExtractor Data, uint32_t* OffsetPtr) {
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clear();
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Code = Data.getULEB128(OffsetPtr);
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if (Code == 0) {
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return false;
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}
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Tag = Data.getULEB128(OffsetPtr);
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uint8_t ChildrenByte = Data.getU8(OffsetPtr);
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HasChildren = (ChildrenByte == DW_CHILDREN_yes);
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while (true) {
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uint32_t CurOffset = *OffsetPtr;
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uint16_t Attr = Data.getULEB128(OffsetPtr);
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if (CurOffset == *OffsetPtr) {
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clear();
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return false;
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}
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CurOffset = *OffsetPtr;
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uint16_t Form = Data.getULEB128(OffsetPtr);
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if (CurOffset == *OffsetPtr) {
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clear();
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return false;
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}
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if (Attr == 0 && Form == 0)
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break;
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AttributeSpecs.push_back(AttributeSpec(Attr, Form));
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}
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if (Tag == 0) {
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clear();
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return false;
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}
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return true;
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}
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void DWARFAbbreviationDeclaration::dump(raw_ostream &OS) const {
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const char *tagString = TagString(getTag());
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OS << '[' << getCode() << "] ";
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if (tagString)
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OS << tagString;
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else
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OS << format("DW_TAG_Unknown_%x", getTag());
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OS << "\tDW_CHILDREN_" << (hasChildren() ? "yes" : "no") << '\n';
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for (const AttributeSpec &Spec : AttributeSpecs) {
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OS << '\t';
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const char *attrString = AttributeString(Spec.Attr);
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if (attrString)
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OS << attrString;
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else
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OS << format("DW_AT_Unknown_%x", Spec.Attr);
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OS << '\t';
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const char *formString = FormEncodingString(Spec.Form);
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if (formString)
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OS << formString;
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else
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OS << format("DW_FORM_Unknown_%x", Spec.Form);
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OS << '\n';
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}
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OS << '\n';
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}
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uint32_t
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DWARFAbbreviationDeclaration::findAttributeIndex(uint16_t attr) const {
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for (uint32_t i = 0, e = AttributeSpecs.size(); i != e; ++i) {
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if (AttributeSpecs[i].Attr == attr)
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return i;
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}
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return -1U;
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}
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