[RemoveDIs][NFC] Remove dbg intrinsic handling code from SelectionDAG ISel (#144702)

Author: OCHyams

llvm/include/llvm/CodeGen/FunctionLoweringInfo.h

@@ -35,7 +35,6 @@ namespace llvm {
 class Argument;
 class BasicBlock;
 class BranchProbabilityInfo;
-class DbgDeclareInst;
 class Function;
 class Instruction;
 class MachineFunction;
@@ -191,9 +190,8 @@ class FunctionLoweringInfo {
   /// The current call site index being processed, if any. 0 if none.
   unsigned CurCallSite = 0;
 
-  /// Collection of dbg.declare instructions handled after argument
+  /// Collection of dbg_declare instructions handled after argument
   /// lowering and before ISel proper.
-  SmallPtrSet<const DbgDeclareInst *, 8> PreprocessedDbgDeclares;
   SmallPtrSet<const DbgVariableRecord *, 8> PreprocessedDVRDeclares;
 
   /// set - Initialize this FunctionLoweringInfo with the given Function

llvm/lib/CodeGen/SelectionDAG/FastISel.cpp

@@ -1395,51 +1395,6 @@ bool FastISel::selectIntrinsicCall(const IntrinsicInst *II) {
   // Neither does the llvm.experimental.noalias.scope.decl intrinsic
   case Intrinsic::experimental_noalias_scope_decl:
     return true;
-  case Intrinsic::dbg_declare: {
-    const DbgDeclareInst *DI = cast<DbgDeclareInst>(II);
-    assert(DI->getVariable() && "Missing variable");
-    if (FuncInfo.PreprocessedDbgDeclares.contains(DI))
-      return true;
-
-    const Value *Address = DI->getAddress();
-    if (!lowerDbgDeclare(Address, DI->getExpression(), DI->getVariable(),
-                         MIMD.getDL()))
-      LLVM_DEBUG(dbgs() << "Dropping debug info for " << *DI);
-
-    return true;
-  }
-  case Intrinsic::dbg_assign:
-    // A dbg.assign is a dbg.value with more information, typically produced
-    // during optimisation. If one reaches fastisel then something odd has
-    // happened (such as an optimised function being always-inlined into an
-    // optnone function). We will not be using the extra information in the
-    // dbg.assign in that case, just use its dbg.value fields.
-    [[fallthrough]];
-  case Intrinsic::dbg_value: {
-    // This form of DBG_VALUE is target-independent.
-    const DbgValueInst *DI = cast<DbgValueInst>(II);
-    const Value *V = DI->getValue();
-    DIExpression *Expr = DI->getExpression();
-    DILocalVariable *Var = DI->getVariable();
-    if (DI->hasArgList())
-      // Signal that we don't have a location for this.
-      V = nullptr;
-
-    assert(Var->isValidLocationForIntrinsic(MIMD.getDL()) &&
-           "Expected inlined-at fields to agree");
-
-    if (!lowerDbgValue(V, Expr, Var, MIMD.getDL()))
-      LLVM_DEBUG(dbgs() << "Dropping debug info for " << *DI << "\n");
-
-    return true;
-  }
-  case Intrinsic::dbg_label: {
-    const DbgLabelInst *DI = cast<DbgLabelInst>(II);
-    assert(DI->getLabel() && "Missing label");
-    BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, MIMD,
-            TII.get(TargetOpcode::DBG_LABEL)).addMetadata(DI->getLabel());
-    return true;
-  }
   case Intrinsic::objectsize:
     llvm_unreachable("llvm.objectsize.* should have been lowered already");
 

llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp

@@ -369,7 +369,6 @@ void FunctionLoweringInfo::clear() {
   StatepointStackSlots.clear();
   StatepointRelocationMaps.clear();
   PreferredExtendType.clear();
-  PreprocessedDbgDeclares.clear();
   PreprocessedDVRDeclares.clear();
 }
 

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -6674,69 +6674,6 @@ void SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I,
     DAG.setRoot(Res.getValue(1));
     return;
   }
-  case Intrinsic::dbg_declare: {
-    const auto &DI = cast<DbgDeclareInst>(I);
-    // Debug intrinsics are handled separately in assignment tracking mode.
-    // Some intrinsics are handled right after Argument lowering.
-    if (AssignmentTrackingEnabled ||
-        FuncInfo.PreprocessedDbgDeclares.count(&DI))
-      return;
-    LLVM_DEBUG(dbgs() << "SelectionDAG visiting dbg_declare: " << DI << "\n");
-    DILocalVariable *Variable = DI.getVariable();
-    DIExpression *Expression = DI.getExpression();
-    dropDanglingDebugInfo(Variable, Expression);
-    // Assume dbg.declare can not currently use DIArgList, i.e.
-    // it is non-variadic.
-    assert(!DI.hasArgList() && "Only dbg.value should currently use DIArgList");
-    handleDebugDeclare(DI.getVariableLocationOp(0), Variable, Expression,
-                       DI.getDebugLoc());
-    return;
-  }
-  case Intrinsic::dbg_label: {
-    const DbgLabelInst &DI = cast<DbgLabelInst>(I);
-    DILabel *Label = DI.getLabel();
-    assert(Label && "Missing label");
-
-    SDDbgLabel *SDV;
-    SDV = DAG.getDbgLabel(Label, dl, SDNodeOrder);
-    DAG.AddDbgLabel(SDV);
-    return;
-  }
-  case Intrinsic::dbg_assign: {
-    // Debug intrinsics are handled separately in assignment tracking mode.
-    if (AssignmentTrackingEnabled)
-      return;
-    // If assignment tracking hasn't been enabled then fall through and treat
-    // the dbg.assign as a dbg.value.
-    [[fallthrough]];
-  }
-  case Intrinsic::dbg_value: {
-    // Debug intrinsics are handled separately in assignment tracking mode.
-    if (AssignmentTrackingEnabled)
-      return;
-    const DbgValueInst &DI = cast<DbgValueInst>(I);
-    assert(DI.getVariable() && "Missing variable");
-
-    DILocalVariable *Variable = DI.getVariable();
-    DIExpression *Expression = DI.getExpression();
-    dropDanglingDebugInfo(Variable, Expression);
-
-    if (DI.isKillLocation()) {
-      handleKillDebugValue(Variable, Expression, DI.getDebugLoc(), SDNodeOrder);
-      return;
-    }
-
-    SmallVector<Value *, 4> Values(DI.getValues());
-    if (Values.empty())
-      return;
-
-    bool IsVariadic = DI.hasArgList();
-    if (!handleDebugValue(Values, Variable, Expression, DI.getDebugLoc(),
-                          SDNodeOrder, IsVariadic))
-      addDanglingDebugInfo(Values, Variable, Expression, IsVariadic,
-                           DI.getDebugLoc(), SDNodeOrder);
-    return;
-  }
 
   case Intrinsic::eh_typeid_for: {
     // Find the type id for the given typeinfo.

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h

@@ -56,7 +56,6 @@ class CleanupPadInst;
 class CleanupReturnInst;
 class Constant;
 class ConstrainedFPIntrinsic;
-class DbgValueInst;
 class DataLayout;
 class DIExpression;
 class DILocalVariable;

llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -1592,10 +1592,6 @@ static bool processDbgDeclare(FunctionLoweringInfo &FuncInfo,
 /// in case the declarations refer to arguments.
 static void processDbgDeclares(FunctionLoweringInfo &FuncInfo) {
   for (const auto &I : instructions(*FuncInfo.Fn)) {
-    const auto *DI = dyn_cast<DbgDeclareInst>(&I);
-    if (DI && processDbgDeclare(FuncInfo, DI->getAddress(), DI->getExpression(),
-                                DI->getVariable(), DI->getDebugLoc()))
-      FuncInfo.PreprocessedDbgDeclares.insert(DI);
     for (const DbgVariableRecord &DVR : filterDbgVars(I.getDbgRecordRange())) {
       if (DVR.Type == DbgVariableRecord::LocationType::Declare &&
           processDbgDeclare(FuncInfo, DVR.getVariableLocationOp(0),