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

llvm-svn: 181467

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index 3be5e0f8496..38fc90f865e 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -695,6 +695,13 @@ DIArray DISubprogram::getVariables() const {
   return DIArray();
 }
 
+void DIScope::setFilename(StringRef Name, LLVMContext &Context) {
+  if (!DbgNode)
+    return;
+  MDString *MDName(MDString::get(Context, Name));
+  const_cast<MDNode*>(getNodeField(DbgNode, 1))->replaceOperandWith(0, MDName);
+}
+
 StringRef DIScope::getFilename() const {
   if (!DbgNode)
     return StringRef();