Revert r200340, "Add line table debug info to COFF files when using a win32 triple."

It was incompatible with --target=i686-win32.

llvm-svn: 200375

1 files changed, 25 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 7c9f7a981a4..1d059d9f3c7 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1525,6 +1525,30 @@ void DwarfDebug::identifyScopeMarkers() {
   }
 }
 
+// Get MDNode for DebugLoc's scope.
+static MDNode *getScopeNode(DebugLoc DL, const LLVMContext &Ctx) {
+  if (MDNode *InlinedAt = DL.getInlinedAt(Ctx))
+    return getScopeNode(DebugLoc::getFromDILocation(InlinedAt), Ctx);
+  return DL.getScope(Ctx);
+}
+
+// Walk up the scope chain of given debug loc and find line number info
+// for the function.
+static DebugLoc getFnDebugLoc(DebugLoc DL, const LLVMContext &Ctx) {
+  const MDNode *Scope = getScopeNode(DL, Ctx);
+  DISubprogram SP = getDISubprogram(Scope);
+  if (SP.isSubprogram()) {
+    // Check for number of operands since the compatibility is
+    // cheap here.
+    if (SP->getNumOperands() > 19)
+      return DebugLoc::get(SP.getScopeLineNumber(), 0, SP);
+    else
+      return DebugLoc::get(SP.getLineNumber(), 0, SP);
+  }
+
+  return DebugLoc();
+}
+
 // Gather pre-function debug information.  Assumes being called immediately
 // after the function entry point has been emitted.
 void DwarfDebug::beginFunction(const MachineFunction *MF) {
@@ -1719,7 +1743,7 @@ void DwarfDebug::beginFunction(const MachineFunction *MF) {
   // Record beginning of function.
   if (!PrologEndLoc.isUnknown()) {
     DebugLoc FnStartDL =
-        PrologEndLoc.getFnDebugLoc(MF->getFunction()->getContext());
+        getFnDebugLoc(PrologEndLoc, MF->getFunction()->getContext());
     recordSourceLine(
         FnStartDL.getLine(), FnStartDL.getCol(),
         FnStartDL.getScope(MF->getFunction()->getContext()),