[PATCH] Emit Clang version information into .comment section (Clang's part of implementation) [PART 1]

[Katya Romanova]

  Hi Rafael,
  I re-based the original patch. Could you please commit?
  Thanks!

http://llvm-reviews.chandlerc.com/D1720

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1720?vs=4380&id=4970#toc

Files:
  test/Driver/ident_md.c
  test/CodeGenObjC/ivar-base-as-invariant-load.m
  lib/CodeGen/CodeGenModule.h
  lib/CodeGen/CodeGenModule.cpp

Index: test/Driver/ident_md.c
===================================================================
--- test/Driver/ident_md.c
+++ test/Driver/ident_md.c
@@ -0,0 +1,6 @@
+// RUN: %clang %s -emit-llvm -S -o - | FileCheck %s
+// Verify that clang version appears in the llvm.ident metadata.
+
+// CHECK: !llvm.ident = !{!0}
+// CHECK: !0 = metadata !{metadata !{{.*}}
+
Index: test/CodeGenObjC/ivar-base-as-invariant-load.m
===================================================================
--- test/CodeGenObjC/ivar-base-as-invariant-load.m
+++ test/CodeGenObjC/ivar-base-as-invariant-load.m
@@ -23,7 +23,7 @@
 
 @end
 
-// CHECK: [[T1:%.*]] = load i64* @"OBJC_IVAR_$_A._flags", !invariant.load !4
-// CHECK: [[T2:%.*]] = load i64* @"OBJC_IVAR_$_A._flags", !invariant.load !4
-// CHECK: [[T3:%.*]] = load i64* @"OBJC_IVAR_$_A._flags", !invariant.load !4
+// CHECK: [[T1:%.*]] = load i64* @"OBJC_IVAR_$_A._flags", !invariant.load !5
+// CHECK: [[T2:%.*]] = load i64* @"OBJC_IVAR_$_A._flags", !invariant.load !5
+// CHECK: [[T3:%.*]] = load i64* @"OBJC_IVAR_$_A._flags", !invariant.load !5
 
Index: lib/CodeGen/CodeGenModule.h
===================================================================
--- lib/CodeGen/CodeGenModule.h
+++ lib/CodeGen/CodeGenModule.h
@@ -1094,6 +1094,9 @@
 
   void EmitDeclMetadata();
 
+  /// \brief Emit the Clang version as llvm.ident metadata.
+  void EmitVersionIdentMetadata();
+
   /// EmitCoverageFile - Emit the llvm.gcov metadata used to tell LLVM where
   /// to emit the .gcno and .gcda files in a way that persists in .bc files.
   void EmitCoverageFile();
Index: lib/CodeGen/CodeGenModule.cpp
===================================================================
--- lib/CodeGen/CodeGenModule.cpp
+++ lib/CodeGen/CodeGenModule.cpp
@@ -35,6 +35,7 @@
 #include "clang/Basic/Module.h"
 #include "clang/Basic/SourceManager.h"
 #include "clang/Basic/TargetInfo.h"
+#include "clang/Basic/Version.h"
 #include "clang/Frontend/CodeGenOptions.h"
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/Triple.h"
@@ -204,6 +205,8 @@
 
   if (DebugInfo)
     DebugInfo->finalize();
+
+  EmitVersionIdentMetadata();
 }
 
 void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
@@ -3034,6 +3037,18 @@
   }
 }
 
+void CodeGenModule::EmitVersionIdentMetadata() {
+  llvm::NamedMDNode *IdentMetadata =
+    TheModule.getOrInsertNamedMetadata("llvm.ident");
+  std::string Version = getClangFullVersion();
+  llvm::LLVMContext &Ctx = TheModule.getContext();
+
+  llvm::Value *IdentNode[] = {
+    llvm::MDString::get(Ctx, Version)
+  };
+  IdentMetadata->addOperand(llvm::MDNode::get(Ctx, IdentNode));
+}
+
 void CodeGenModule::EmitCoverageFile() {
   if (!getCodeGenOpts().CoverageFile.empty()) {
     if (llvm::NamedMDNode *CUNode = TheModule.getNamedMetadata("llvm.dbg.cu")) {
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