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//===-- DWARFAbbreviationDeclaration.cpp ----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFAbbreviationDeclaration.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace dwarf;
void DWARFAbbreviationDeclaration::clear() {
Code = 0;
Tag = 0;
HasChildren = false;
AttributeSpecs.clear();
}
DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration() {
clear();
}
bool
DWARFAbbreviationDeclaration::extract(DataExtractor Data, uint32_t* OffsetPtr) {
clear();
Code = Data.getULEB128(OffsetPtr);
if (Code == 0) {
return false;
}
Tag = Data.getULEB128(OffsetPtr);
uint8_t ChildrenByte = Data.getU8(OffsetPtr);
HasChildren = (ChildrenByte == DW_CHILDREN_yes);
while (true) {
uint32_t CurOffset = *OffsetPtr;
uint16_t Attr = Data.getULEB128(OffsetPtr);
if (CurOffset == *OffsetPtr) {
clear();
return false;
}
CurOffset = *OffsetPtr;
uint16_t Form = Data.getULEB128(OffsetPtr);
if (CurOffset == *OffsetPtr) {
clear();
return false;
}
if (Attr == 0 && Form == 0)
break;
AttributeSpecs.push_back(AttributeSpec(Attr, Form));
}
if (Tag == 0) {
clear();
return false;
}
return true;
}
void DWARFAbbreviationDeclaration::dump(raw_ostream &OS) const {
const char *tagString = TagString(getTag());
OS << '[' << getCode() << "] ";
if (tagString)
OS << tagString;
else
OS << format("DW_TAG_Unknown_%x", getTag());
OS << "\tDW_CHILDREN_" << (hasChildren() ? "yes" : "no") << '\n';
for (const AttributeSpec &Spec : AttributeSpecs) {
OS << '\t';
const char *attrString = AttributeString(Spec.Attr);
if (attrString)
OS << attrString;
else
OS << format("DW_AT_Unknown_%x", Spec.Attr);
OS << '\t';
const char *formString = FormEncodingString(Spec.Form);
if (formString)
OS << formString;
else
OS << format("DW_FORM_Unknown_%x", Spec.Form);
OS << '\n';
}
OS << '\n';
}
uint32_t
DWARFAbbreviationDeclaration::findAttributeIndex(uint16_t attr) const {
for (uint32_t i = 0, e = AttributeSpecs.size(); i != e; ++i) {
if (AttributeSpecs[i].Attr == attr)
return i;
}
return -1U;
}
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