Debug Info: Add basic support for external types references.
This is a necessary prerequisite for bootstrapping the emission
of debug info inside modules.
- Adds a FlagExternalTypeRef to DICompositeType.
External types must have a unique identifier.
- External type references are emitted using a forward declaration
with a DW_AT_signature([DW_FORM_ref_sig8]) based on the UID.
http://reviews.llvm.org/D9612
llvm-svn: 242302
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index 3555822..799398a 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -277,6 +277,13 @@
dwarf::DW_FORM_ref_sig8, DIETypeSignature(Type));
}
+void DwarfUnit::addDIETypeSignature(DIE &Die, dwarf::Attribute Attribute,
+ StringRef Identifier) {
+ uint64_t Signature = DD->makeTypeSignature(Identifier);
+ Die.addValue(DIEValueAllocator, Attribute, dwarf::DW_FORM_ref_sig8,
+ DIEInteger(Signature));
+}
+
void DwarfUnit::addDIEEntry(DIE &Die, dwarf::Attribute Attribute,
DIEEntry Entry) {
const DIE *DieCU = Die.getUnitOrNull();
@@ -700,7 +707,8 @@
constructTypeDIE(TyDIE, cast<DICompositeType>(Ty));
- updateAcceleratorTables(Context, Ty, TyDIE);
+ if (!Ty->isExternalTypeRef())
+ updateAcceleratorTables(Context, Ty, TyDIE);
return &TyDIE;
}
@@ -899,6 +907,13 @@
}
void DwarfUnit::constructTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
+ if (CTy->isExternalTypeRef()) {
+ StringRef Identifier = CTy->getIdentifier();
+ assert(!Identifier.empty() && "external type ref without identifier");
+ addFlag(Buffer, dwarf::DW_AT_declaration);
+ return addDIETypeSignature(Buffer, dwarf::DW_AT_signature, Identifier);
+ }
+
// Add name if not anonymous or intermediate type.
StringRef Name = CTy->getName();