Record debug location information in the Dwarf writer.

A simple test program shows that debugging works. :-)

llvm-svn: 63968

1 files changed, 15 insertions, 2 deletions

diff --git a/llvm/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp b/llvm/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
index 9e0afc8d6f2..847355c50d7 100644
--- a/llvm/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
+++ b/llvm/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
@@ -207,6 +207,7 @@ void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
 ///
 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   const Function *F = MF.getFunction();
+  this->MF = &MF;
   unsigned CC = F->getCallingConv();
 
   SetupMachineFunction(MF);
@@ -718,12 +719,24 @@ bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
   return false;
 }
 
-/// printMachineInstruction -- Print out a single X86 LLVM instruction
-/// MI in AT&T syntax to the current output stream.
+/// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
+/// AT&T syntax to the current output stream.
 ///
 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
   ++EmittedInsts;
 
+  if (TAI->doesSupportDebugInformation()) {
+    static DebugLoc PrevDL = DebugLoc::getUnknownLoc();
+    DebugLoc CurDL = MI->getDebugLoc();
+
+    if (!CurDL.isInvalid() && !CurDL.isUnknown() && PrevDL != CurDL) {
+      DebugLocTuple DLT = MF->getDebugLocTuple(CurDL);
+      printLabel(DW->RecordSourceLine(DLT.Line, DLT.Col, DLT.Src));
+    }
+
+    PrevDL = CurDL;
+  }
+
   // Call the autogenerated instruction printer routines.
   printInstruction(MI);
 }