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DebugInfo: Introduce new DIValue, DIETypeSignature to encode references to type units via their signatures

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This simplifies type unit and type unit reference creation as well as
setting the stage for inter-type hashing across type unit boundaries.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197539 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2013-12-17 23:32:35 +00:00
parent f07d462beb
commit 2cb3295a53
6 changed files with 61 additions and 36 deletions
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33
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@@ -3015,35 +3015,18 @@ void DwarfDebug::emitDebugStrDWO() {
void DwarfDebug::addDwarfTypeUnitType(uint16_t Language, DIE *RefDie,
DICompositeType CTy) {
DenseMap<const MDNode *,
std::pair<uint64_t, SmallVectorImpl<DIE *> *> >::iterator I =
DwarfTypeUnits.find(CTy);
SmallVector<DIE *, 8> References;
References.push_back(RefDie);
if (I != DwarfTypeUnits.end()) {
if (I->second.second) {
I->second.second->push_back(RefDie);
return;
}
} else {
const DwarfTypeUnit *&TU = DwarfTypeUnits[CTy];
if (!TU) {
DIE *UnitDie = new DIE(dwarf::DW_TAG_type_unit);
DwarfTypeUnit *NewTU =
new DwarfTypeUnit(InfoHolder.getUnits().size(), UnitDie, Language, Asm,
this, &InfoHolder);
TU = NewTU;
InfoHolder.addUnit(NewTU);
NewTU->addUInt(UnitDie, dwarf::DW_AT_language, dwarf::DW_FORM_data2,
Language);
// Register the type in the DwarfTypeUnits map with a vector of references
// to be
// populated whenever a reference is required.
I = DwarfTypeUnits.insert(std::make_pair(
CTy, std::make_pair(0, &References))).first;
// Construct the type, this may, recursively, require more type units that
// may in turn require this type again - in which case they will add DIEs to
// the References vector.
DIE *Die = NewTU->createTypeDIE(CTy);
if (GenerateODRHash && shouldAddODRHash(NewTU, Die))
@@ -3059,19 +3042,11 @@ void DwarfDebug::addDwarfTypeUnitType(uint16_t Language, DIE *RefDie,
NewTU->setTypeSignature(Signature);
NewTU->setType(Die);
// Remove the References vector and add the type hash.
I->second.first = Signature;
I->second.second = NULL;
NewTU->initSection(
useSplitDwarf()
? Asm->getObjFileLowering().getDwarfTypesDWOSection(Signature)
: Asm->getObjFileLowering().getDwarfTypesSection(Signature));
}
// Populate all the signatures.
for (unsigned i = 0, e = References.size(); i != e; ++i) {
CUMap.begin()->second->addUInt(References[i], dwarf::DW_AT_signature,
dwarf::DW_FORM_ref_sig8, I->second.first);
}
CUMap.begin()->second->addDIETypeSignature(RefDie, *TU);
}