Added initial support for DEBUG_LABEL allowing debug specific labels to be

inserted in the code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25104 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/DwarfWriter.h

@@ -550,8 +550,9 @@ namespace llvm {
     ///
     void EmitInitial() const;
     
-    /// ShouldEmitDwarf - Determine if dwarf declarations should be made.
-    ///
+    /// ShouldEmitDwarf - Returns true if dwarf declarations should be made.
+    /// When called it also checks to see if debug info is newly available.  if
+    /// so the initial dwarf headers are emitted.
     bool ShouldEmitDwarf();
 
     /// BeginModule - Emit all dwarf sections that should come prior to the

include/llvm/CodeGen/MachineDebugInfo.h

@@ -52,6 +52,13 @@ public:
   ///
   unsigned getNextUniqueID() { return UniqueID++; }
   
+  /// RecordLabel - Records location information and associates it with a
+  /// debug label.  Returns unique label id.
+  unsigned RecordLabel(unsigned Line, unsigned Col, unsigned SrcFile) {
+    // FIXME - actually record.
+    return getNextUniqueID();
+  }
+  
   bool doInitialization();
   bool doFinalization();
   

include/llvm/CodeGen/SelectionDAGNodes.h

@@ -355,12 +355,17 @@ namespace ISD {
     LOCATION,
     
     // DEBUG_LOC - This node is used to represent source line information
-    // embedded in the code.  It takes token chain as input, then a line number,
-    // then a column then a file id (provided by MachineDebugInfo), then a
-    // unique id (provided by MachineDebugInfo for label gen).  It produces a
-    // token chain as output.
+    // embedded in the code.  It takes a token chain as input, then a line
+    // number, then a column then a file id (provided by MachineDebugInfo.) It
+    // produces a token chain as output.
     DEBUG_LOC,
     
+    // DEBUG_LABEL - This node is used to mark a location in the code where a
+    // label should be generated for use by the debug information.  It takes a
+    // token chain as input, the a unique id (provided by MachineDebugInfo.) It
+    // produces a token chain as output.
+    DEBUG_LABEL,
+    
     // BUILTIN_OP_END - This must be the last enum value in this list.
     BUILTIN_OP_END,
   };

lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -2117,8 +2117,7 @@ SDOperand DAGCombiner::visitDEBUGLOC(SDNode *N) {
     return DAG.getNode(ISD::DEBUG_LOC, MVT::Other, Chain.getOperand(0),
                                                    N->getOperand(1),
                                                    N->getOperand(2),
-                                                   N->getOperand(3),
-                                                   N->getOperand(4));
+                                                   N->getOperand(3));
   }
   
   return SDOperand();

lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

@@ -619,20 +619,33 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
     default: assert(0 && "This action is not supported yet!");
     case TargetLowering::Expand: {
       MachineDebugInfo *DebugInfo = DAG.getMachineDebugInfo();
-      if (TLI.isOperationLegal(ISD::DEBUG_LOC, MVT::Other) && DebugInfo) {
+      bool useDEBUG_LOC = TLI.isOperationLegal(ISD::DEBUG_LOC, MVT::Other);
+      bool useDEBUG_LABEL = TLI.isOperationLegal(ISD::DEBUG_LABEL, MVT::Other);
+      
+      if (DebugInfo && (useDEBUG_LOC || useDEBUG_LABEL)) {
+        const std::string &FName =
+          cast<StringSDNode>(Node->getOperand(3))->getValue();
+        const std::string &DirName = 
+          cast<StringSDNode>(Node->getOperand(4))->getValue();
+        unsigned SrcFile = DebugInfo->getUniqueSourceID(FName, DirName);
+
         std::vector<SDOperand> Ops;
         Ops.push_back(Tmp1);  // chain
-        Ops.push_back(Node->getOperand(1));  // line #
-        Ops.push_back(Node->getOperand(2));  // col #
-        const std::string &fname =
-          cast<StringSDNode>(Node->getOperand(3))->getValue();
-        const std::string &dirname = 
-          cast<StringSDNode>(Node->getOperand(4))->getValue();
-        unsigned srcfile = DebugInfo->getUniqueSourceID(fname, dirname);
-        Ops.push_back(DAG.getConstant(srcfile, MVT::i32));  // source file id
-        unsigned id = DebugInfo->getNextUniqueID();
-        Ops.push_back(DAG.getConstant(id, MVT::i32));  // label id
-        Result = DAG.getNode(ISD::DEBUG_LOC, MVT::Other, Ops);
+        SDOperand LineOp = Node->getOperand(1);
+        SDOperand ColOp = Node->getOperand(2);
+        
+        if (useDEBUG_LOC) {
+          Ops.push_back(LineOp);  // line #
+          Ops.push_back(ColOp);  // col #
+          Ops.push_back(DAG.getConstant(SrcFile, MVT::i32));  // source file id
+          Result = DAG.getNode(ISD::DEBUG_LOC, MVT::Other, Ops);
+        } else {
+          unsigned Line = dyn_cast<ConstantSDNode>(LineOp)->getValue();
+          unsigned Col = dyn_cast<ConstantSDNode>(ColOp)->getValue();
+          unsigned ID = DebugInfo->RecordLabel(Line, Col, SrcFile);
+          Ops.push_back(DAG.getConstant(ID, MVT::i32));
+          Result = DAG.getNode(ISD::DEBUG_LABEL, MVT::Other, Ops);
+        }
       } else {
         Result = Tmp1;  // chain
       }
@@ -661,27 +674,40 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
     break;
     
   case ISD::DEBUG_LOC:
-    assert(Node->getNumOperands() == 5 && "Invalid DEBUG_LOC node!");
+    assert(Node->getNumOperands() == 4 && "Invalid DEBUG_LOC node!");
     switch (TLI.getOperationAction(ISD::DEBUG_LOC, MVT::Other)) {
     case TargetLowering::Promote:
     case TargetLowering::Expand:
     default: assert(0 && "This action is not supported yet!");
-    case TargetLowering::Legal: {
-        SDOperand Tmp5;
-        Tmp1 = LegalizeOp(Node->getOperand(0));  // Legalize the chain.
-        Tmp2 = LegalizeOp(Node->getOperand(1));  // Legalize the line #.
-        Tmp3 = LegalizeOp(Node->getOperand(2));  // Legalize the col #.
-        Tmp4 = LegalizeOp(Node->getOperand(3));  // Legalize the source file id.
-        Tmp5 = LegalizeOp(Node->getOperand(4));  // Legalize the label id.
-        
-        if (Tmp1 != Node->getOperand(0) ||
-            Tmp2 != Node->getOperand(1) ||
-            Tmp3 != Node->getOperand(2) ||
-            Tmp4 != Node->getOperand(3) ||
-            Tmp5 != Node->getOperand(4)) {
-          Result =
-           DAG.getNode(ISD::DEBUG_LOC,MVT::Other, Tmp1, Tmp2, Tmp3, Tmp4, Tmp5);
-        }
+    case TargetLowering::Legal:
+      Tmp1 = LegalizeOp(Node->getOperand(0));  // Legalize the chain.
+      Tmp2 = LegalizeOp(Node->getOperand(1));  // Legalize the line #.
+      Tmp3 = LegalizeOp(Node->getOperand(2));  // Legalize the col #.
+      Tmp4 = LegalizeOp(Node->getOperand(3));  // Legalize the source file id.
+      
+      if (Tmp1 != Node->getOperand(0) ||
+          Tmp2 != Node->getOperand(1) ||
+          Tmp3 != Node->getOperand(2) ||
+          Tmp4 != Node->getOperand(3)) {
+        Result = DAG.getNode(ISD::DEBUG_LOC,MVT::Other, Tmp1, Tmp2, Tmp3, Tmp4);
+      }
+      break;
+    }
+    break;    
+
+  case ISD::DEBUG_LABEL:
+    assert(Node->getNumOperands() == 2 && "Invalid DEBUG_LABEL node!");
+    switch (TLI.getOperationAction(ISD::DEBUG_LABEL, MVT::Other)) {
+    case TargetLowering::Promote:
+    case TargetLowering::Expand:
+    default: assert(0 && "This action is not supported yet!");
+    case TargetLowering::Legal:
+      Tmp1 = LegalizeOp(Node->getOperand(0));  // Legalize the chain.
+      Tmp2 = LegalizeOp(Node->getOperand(1));  // Legalize the label id.
+      
+      if (Tmp1 != Node->getOperand(0) ||
+          Tmp2 != Node->getOperand(1)) {
+        Result = DAG.getNode(ISD::DEBUG_LABEL, MVT::Other, Tmp1, Tmp2);
       }
       break;
     }

lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -2005,6 +2005,7 @@ const char *SDNode::getOperationName(const SelectionDAG *G) const {
   // Debug info
   case ISD::LOCATION: return "location";
   case ISD::DEBUG_LOC: return "debug_loc";
+  case ISD::DEBUG_LABEL: return "debug_label";
 
   case ISD::CONDCODE:
     switch (cast<CondCodeSDNode>(this)->get()) {

lib/Target/Alpha/AlphaISelLowering.cpp

@@ -103,7 +103,6 @@ AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM) : TargetLowering(TM)
 
   // We don't have line number support yet.
   setOperationAction(ISD::LOCATION, MVT::Other, Expand);
-  setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
   
   // We want to legalize GlobalAddress and ConstantPool and
   // ExternalSymbols nodes into the appropriate instructions to

lib/Target/IA64/IA64ISelLowering.cpp

@@ -74,7 +74,6 @@ IA64TargetLowering::IA64TargetLowering(TargetMachine &TM)
 
       // We don't have line number support yet.
       setOperationAction(ISD::LOCATION, MVT::Other, Expand);
-      setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
 
       //IA64 has these, but they are not implemented
       setOperationAction(ISD::CTTZ , MVT::i64  , Expand);

lib/Target/IA64/IA64ISelPattern.cpp

@@ -102,7 +102,6 @@ namespace {
 
       // We don't have line number support yet.
       setOperationAction(ISD::LOCATION, MVT::Other, Expand);
-      setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
 
       computeRegisterProperties();
 

lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -252,7 +252,9 @@ namespace {
     bool doFinalization(Module &M);
     
     void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
       AU.addRequired<MachineDebugInfo>();
+      PPCAsmPrinter::getAnalysisUsage(AU);
     }
 
   };
@@ -418,6 +420,9 @@ void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
 /// method to print assembly for each instruction.
 ///
 bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
+  // FIXME - is this the earliest this can be set.
+  DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
+
   SetupMachineFunction(MF);
   O << "\n\n";
   
@@ -486,7 +491,6 @@ bool DarwinAsmPrinter::doInitialization(Module &M) {
   Mang->setUseQuotes(true);
   
   // Emit initial debug information.
-  DW.SetDebugInfo(getAnalysisToUpdate<MachineDebugInfo>());
   DW.BeginModule();
   return false;
 }

lib/Target/PowerPC/PPCISelLowering.cpp

@@ -94,8 +94,11 @@ PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
   // PowerPC does not have truncstore for i1.
   setOperationAction(ISD::TRUNCSTORE, MVT::i1, Promote);
 
-  // PowerPC doesn't have line number support yet.
+  // Support label based line numbers.
   setOperationAction(ISD::LOCATION, MVT::Other, Expand);
+  // FIXME - use subtarget debug flags
+  if (TM.getSubtarget<PPCSubtarget>().isDarwin())
+    setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand);
   
   // We want to legalize GlobalAddress and ConstantPool nodes into the 
   // appropriate instructions to materialize the address.

lib/Target/PowerPC/PPCInstrInfo.td

@@ -955,11 +955,14 @@ def V_SET0 : VXForm_setzero<1220, (ops VRRC:$vD),
 // DWARF Pseudo Instructions
 //
 
-def DWARF_LOC        : Pseudo<(ops i32imm:$line, i32imm:$col, i32imm:$file,
-                                   i32imm:$id),
-                              "; .loc $file, $line, $col\nLdebug_loc$id:",
+def DWARF_LOC        : Pseudo<(ops i32imm:$line, i32imm:$col, i32imm:$file),
+                              "; .loc $file, $line, $col",
                       [(dwarf_loc (i32 imm:$line), (i32 imm:$col),
-                                  (i32 imm:$file), (i32 imm:$id))]>;
+                                  (i32 imm:$file))]>;
+
+def DWARF_LABEL      : Pseudo<(ops i32imm:$id),
+                              "\nLdebug_loc$id:",
+                      [(dwarf_label (i32 imm:$id))]>;
 
 //===----------------------------------------------------------------------===//
 // PowerPC Instruction Patterns

lib/Target/Sparc/SparcISelDAGToDAG.cpp

@@ -153,7 +153,6 @@ SparcV8TargetLowering::SparcV8TargetLowering(TargetMachine &TM)
 
   // We don't have line number support yet.
   setOperationAction(ISD::LOCATION, MVT::Other, Expand);
-  setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
 
   computeRegisterProperties();
 }

lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp

@@ -153,7 +153,6 @@ SparcV8TargetLowering::SparcV8TargetLowering(TargetMachine &TM)
 
   // We don't have line number support yet.
   setOperationAction(ISD::LOCATION, MVT::Other, Expand);
-  setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
 
   computeRegisterProperties();
 }

lib/Target/TargetSelectionDAG.td

@@ -440,9 +440,12 @@ class ComplexPattern<ValueType ty, int numops, string fn, list<SDNode> roots = [
 //===----------------------------------------------------------------------===//
 // Dwarf support.
 //
-def SDT_dwarf_loc : SDTypeProfile<0, 4,
-                      [SDTCisInt<0>, SDTCisInt<1>, SDTCisInt<2>, SDTCisInt<3>]>;
-def dwarf_loc  : SDNode<"ISD::DEBUG_LOC", SDT_dwarf_loc,[SDNPHasChain]>;
+def SDT_dwarf_loc : SDTypeProfile<0, 3,
+                      [SDTCisInt<0>, SDTCisInt<1>, SDTCisInt<2>]>;
+def dwarf_loc : SDNode<"ISD::DEBUG_LOC", SDT_dwarf_loc,[SDNPHasChain]>;
+
+def SDT_dwarf_label : SDTypeProfile<0, 1, [SDTCisInt<0>]>;
+def dwarf_label : SDNode<"ISD::DEBUG_LABEL", SDT_dwarf_label,[SDNPHasChain]>;
 
 
 

lib/Target/X86/X86ISelLowering.cpp

@@ -130,7 +130,6 @@ X86TargetLowering::X86TargetLowering(TargetMachine &TM)
 
   // We don't have line number support yet.
   setOperationAction(ISD::LOCATION, MVT::Other, Expand);
-  setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
 
   if (X86ScalarSSE) {
     // Set up the FP register classes.