Add preliminary support for hashing DIEs and breaking them into

type units.

Initially this support is used in the computation of an ODR checker
for C++. For now we're attaching it to the DIE, but in the future
it will be attached to the type unit.

This also starts breaking out types into the separation for type
units, but without actually splitting the DIEs.

In preparation for hashing the DIEs this adds a DIEString type
that contains a StringRef with the string contained at the label.

llvm-svn: 187213

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DIE.cpp b/llvm/lib/CodeGen/AsmPrinter/DIE.cpp
index d6caef7e5b8..0b154123315 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DIE.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DIE.cpp
@@ -24,6 +24,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/MD5.h"
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//
@@ -323,6 +324,29 @@ void DIEDelta::print(raw_ostream &O) const {
 #endif
 
 //===----------------------------------------------------------------------===//
+// DIEString Implementation
+//===----------------------------------------------------------------------===//
+
+/// EmitValue - Emit string value.
+///
+void DIEString::EmitValue(AsmPrinter *AP, unsigned Form) const {
+  Access->EmitValue(AP, Form);
+}
+
+/// SizeOf - Determine size of delta value in bytes.
+///
+unsigned DIEString::SizeOf(AsmPrinter *AP, unsigned Form) const {
+  return Access->SizeOf(AP, Form);
+}
+
+#ifndef NDEBUG
+void DIEString::print(raw_ostream &O) const {
+  O << "String: " << Str << "\tSymbol: ";
+  Access->print(O);
+}
+#endif
+
+//===----------------------------------------------------------------------===//
 // DIEEntry Implementation
 //===----------------------------------------------------------------------===//