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DWARFAbbreviationDeclaration: remove dead code, refactor parsing code and make it more robust. No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193770 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
2013-10-31 17:20:14 +00:00
parent 2343e3b228
commit bc5e25ddef
3 changed files with 60 additions and 75 deletions
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76
lib/DebugInfo/DWARFAbbreviationDeclaration.cpp
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@@ -14,37 +14,51 @@
using namespace llvm;
using namespace dwarf;
bool
DWARFAbbreviationDeclaration::extract(DataExtractor data, uint32_t* offset_ptr){
return extract(data, offset_ptr, data.getULEB128(offset_ptr));
void DWARFAbbreviationDeclaration::clear() {
Code = 0;
Tag = 0;
HasChildren = false;
Attributes.clear();
}
DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration() {
clear();
}
bool
DWARFAbbreviationDeclaration::extract(DataExtractor data, uint32_t* offset_ptr,
uint32_t code) {
Code = code;
Attribute.clear();
if (Code) {
Tag = data.getULEB128(offset_ptr);
HasChildren = data.getU8(offset_ptr);
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 (data.isValidOffset(*offset_ptr)) {
uint16_t attr = data.getULEB128(offset_ptr);
uint16_t form = data.getULEB128(offset_ptr);
if (attr && form)
Attribute.push_back(DWARFAttribute(attr, form));
else
break;
while (true) {
uint32_t CurOffset = *OffsetPtr;
uint16_t Attr = Data.getULEB128(OffsetPtr);
if (CurOffset == *OffsetPtr) {
clear();
return false;
}
return Tag != 0;
} else {
Tag = 0;
HasChildren = false;
CurOffset = *OffsetPtr;
uint16_t Form = Data.getULEB128(OffsetPtr);
if (CurOffset == *OffsetPtr) {
clear();
return false;
}
if (Attr == 0 && Form == 0)
break;
Attributes.push_back(AttributeSpec(Attr, Form));
}
return false;
if (Tag == 0) {
clear();
return false;
}
return true;
}
void DWARFAbbreviationDeclaration::dump(raw_ostream &OS) const {
@@ -55,19 +69,19 @@ void DWARFAbbreviationDeclaration::dump(raw_ostream &OS) const {
else
OS << format("DW_TAG_Unknown_%x", getTag());
OS << "\tDW_CHILDREN_" << (hasChildren() ? "yes" : "no") << '\n';
for (unsigned i = 0, e = Attribute.size(); i != e; ++i) {
for (unsigned i = 0, e = Attributes.size(); i != e; ++i) {
OS << '\t';
const char *attrString = AttributeString(Attribute[i].getAttribute());
const char *attrString = AttributeString(Attributes[i].Attr);
if (attrString)
OS << attrString;
else
OS << format("DW_AT_Unknown_%x", Attribute[i].getAttribute());
OS << format("DW_AT_Unknown_%x", Attributes[i].Attr);
OS << '\t';
const char *formString = FormEncodingString(Attribute[i].getForm());
const char *formString = FormEncodingString(Attributes[i].Form);
if (formString)
OS << formString;
else
OS << format("DW_FORM_Unknown_%x", Attribute[i].getForm());
OS << format("DW_FORM_Unknown_%x", Attributes[i].Form);
OS << '\n';
}
OS << '\n';
@@ -75,8 +89,8 @@ void DWARFAbbreviationDeclaration::dump(raw_ostream &OS) const {
uint32_t
DWARFAbbreviationDeclaration::findAttributeIndex(uint16_t attr) const {
for (uint32_t i = 0, e = Attribute.size(); i != e; ++i) {
if (Attribute[i].getAttribute() == attr)
for (uint32_t i = 0, e = Attributes.size(); i != e; ++i) {
if (Attributes[i].Attr == attr)
return i;
}
return -1U;