Add DebugIR pass -- emits IR file and replace source lines with IR lines in MD

- requires existing debug information to be present
- fixes up file name and line number information in metadata
- emits a "<orig_filename>-debug.ll" succinct IR file (without !dbg metadata
  or debug intrinsics) that can be read by a debugger
- initialize pass in opt tool to enable the "-debug-ir" flag
- lit tests to follow



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181467 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 8 insertions, 0 deletions

diff --git a/include/llvm/DebugInfo.h b/include/llvm/DebugInfo.h
index 1c7edc971b..5f92ca22ec 100644
--- a/include/llvm/DebugInfo.h
+++ b/include/llvm/DebugInfo.h
@@ -166,6 +166,9 @@ namespace llvm {
   public:
     explicit DIScope(const MDNode *N = 0) : DIDescriptor (N) {}
 
+    /// Set the filename by allocating a new string MDNode for
+    /// it and attaching it to the underlying node.
+    void setFilename(StringRef Name, LLVMContext &Context);
     StringRef getFilename() const;
     StringRef getDirectory() const;
   };
diff --git a/include/llvm/InitializePasses.h b/include/llvm/InitializePasses.h
index 5b2cd603c3..072c2e4895 100644
--- a/include/llvm/InitializePasses.h
+++ b/include/llvm/InitializePasses.h
@@ -100,6 +100,7 @@ void initializeDAEPass(PassRegistry&);
 void initializeDAHPass(PassRegistry&);
 void initializeDCEPass(PassRegistry&);
 void initializeDSEPass(PassRegistry&);
+void initializeDebugIRPass(PassRegistry&);
 void initializeDeadInstEliminationPass(PassRegistry&);
 void initializeDeadMachineInstructionElimPass(PassRegistry&);
 void initializeDependenceAnalysisPass(PassRegistry&);
diff --git a/include/llvm/Transforms/Instrumentation.h b/include/llvm/Transforms/Instrumentation.h
index 4aae200dd0..142b40f1ea 100644
--- a/include/llvm/Transforms/Instrumentation.h
+++ b/include/llvm/Transforms/Instrumentation.h
@@ -78,6 +78,10 @@ FunctionPass *createThreadSanitizerPass(StringRef BlacklistFile = StringRef());
 // checking on loads, stores, and other memory intrinsics.
 FunctionPass *createBoundsCheckingPass();
 
+/// createDebugIRPass - Create and return a pass that modifies a module's
+/// debug metadata to point back to IR instead of the original source file
+ModulePass *createDebugIRPass(StringRef FilenamePostfix);
+
 } // End llvm namespace
 
 #endif