Make sure that debug labels are defined within the same section and after the

entry point of a function.

llvm-svn: 27494

llvm/include/llvm/CodeGen/DwarfWriter.h

@@ -472,8 +472,8 @@ public:
   ///
   void EndModule();
   
-  /// BeginFunction - Gather pre-function debug information.
-  ///
+  /// BeginFunction - Gather pre-function debug information.  Assumes being 
+  /// emitted immediately after the function entry point.
   void BeginFunction(MachineFunction *MF);
   
   /// EndFunction - Gather and emit post-function debug information.

llvm/lib/CodeGen/DwarfWriter.cpp

@@ -1626,15 +1626,13 @@ void DwarfWriter::ConstructRootScope(DebugScope *RootScope) {
   CompileUnitDesc *UnitDesc = static_cast<CompileUnitDesc *>(SPD->getContext());
   CompileUnit *Unit = FindCompileUnit(UnitDesc);
   
-  // Generate the mangled name.
-  std::string MangledName = Asm->Mang->getValueName(MF->getFunction());
-  
   // Get the subprogram die.
   DIE *SPDie = Unit->getDieMapSlotFor(SPD);
   assert(SPDie && "Missing subprogram descriptor");
   
   // Add the function bounds.
-  SPDie->AddObjectLabel(DW_AT_low_pc, DW_FORM_addr, MangledName);
+  SPDie->AddLabel(DW_AT_low_pc, DW_FORM_addr,
+                  DWLabel("func_begin", SubprogramCount));
   SPDie->AddLabel(DW_AT_high_pc, DW_FORM_addr,
                   DWLabel("func_end", SubprogramCount));
   MachineLocation Location(RI->getFrameRegister(*MF));
@@ -2408,8 +2406,8 @@ void DwarfWriter::EndModule() {
   EmitDebugMacInfo();
 }
 
-/// BeginFunction - Gather pre-function debug information.
-///
+/// BeginFunction - Gather pre-function debug information.  Assumes being 
+/// emitted immediately after the function entry point.
 void DwarfWriter::BeginFunction(MachineFunction *MF) {
   this->MF = MF;
   
@@ -2419,8 +2417,7 @@ void DwarfWriter::BeginFunction(MachineFunction *MF) {
   if (!ShouldEmitDwarf()) return;
   EOL("Dwarf Begin Function");
   
-  // Define begin label for subprogram.
-  Asm->SwitchSection(TextSection, 0);
+  // Assumes in correct section after the entry point.
   EmitLabel("func_begin", ++SubprogramCount);
 }
 

llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -511,9 +511,6 @@ bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   SetupMachineFunction(MF);
   O << "\n\n";
   
-  // Emit pre-function debug information.
-  DW.BeginFunction(&MF);
-
   // Print out constants referenced by the function
   EmitConstantPool(MF.getConstantPool());
 
@@ -539,6 +536,9 @@ bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   EmitAlignment(4, F);
   O << CurrentFnName << ":\n";
 
+  // Emit pre-function debug information.
+  DW.BeginFunction(&MF);
+
   // Print out code for the function.
   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
        I != E; ++I) {

llvm/lib/Target/X86/X86ATTAsmPrinter.cpp

@@ -35,11 +35,6 @@ bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   SetupMachineFunction(MF);
   O << "\n\n";
 
-  if (forDarwin) {
-    // Emit pre-function debug information.
-    DW.BeginFunction(&MF);
-  }
-
   // Print out constants referenced by the function
   EmitConstantPool(MF.getConstantPool());
 
@@ -73,6 +68,11 @@ bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   }
   O << CurrentFnName << ":\n";
 
+  if (forDarwin) {
+    // Emit pre-function debug information.
+    DW.BeginFunction(&MF);
+  }
+
   // Print out code for the function.
   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
        I != E; ++I) {

llvm/lib/Target/X86/X86IntelAsmPrinter.cpp

@@ -34,11 +34,6 @@ bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   SetupMachineFunction(MF);
   O << "\n\n";
 
-  if (forDarwin) {
-    // Emit pre-function debug information.
-    DW.BeginFunction(&MF);
-  }
-
   // Print out constants referenced by the function
   EmitConstantPool(MF.getConstantPool());
 
@@ -49,6 +44,11 @@ bool X86IntelAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   if (HasDotTypeDotSizeDirective)
     O << "\t.type\t" << CurrentFnName << ", @function\n";
   O << CurrentFnName << ":\n";
+  
+  if (forDarwin) {
+    // Emit pre-function debug information.
+    DW.BeginFunction(&MF);
+  }
 
   // Print out code for the function.
   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();