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

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

llvm-svn: 197539

1 files changed, 17 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DIE.cpp b/llvm/lib/CodeGen/AsmPrinter/DIE.cpp
index 264d89152cf..e973541ee5b 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DIE.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DIE.cpp
@@ -13,6 +13,7 @@
 
 #include "DIE.h"
 #include "DwarfDebug.h"
+#include "DwarfUnit.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/IR/DataLayout.h"
@@ -404,6 +405,22 @@ void DIEEntry::print(raw_ostream &O) const {
 #endif
 
 //===----------------------------------------------------------------------===//
+// DIETypeSignature Implementation
+//===----------------------------------------------------------------------===//
+void DIETypeSignature::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
+  assert(Form == dwarf::DW_FORM_ref_sig8);
+  Asm->OutStreamer.EmitIntValue(Unit.getTypeSignature(), 8);
+}
+
+#ifndef NDEBUG
+void DIETypeSignature::print(raw_ostream &O) const {
+  O << format("Type Unit: 0x%lx", Unit.getTypeSignature());
+}
+
+void DIETypeSignature::dump() const { print(dbgs()); }
+#endif
+
+//===----------------------------------------------------------------------===//
 // DIEBlock Implementation
 //===----------------------------------------------------------------------===//