[flang][Transforms][NFC] reduce boilerplate in func attr pass (#94739)

Use tablegen to automatically create the pass constructor.

The purpose of this pass is to add attributes to functions, so it
doesn't need to work on other top level operations.

Author: tblah

flang/include/flang/Optimizer/Transforms/Passes.h

@@ -55,6 +55,7 @@ namespace fir {
 #define GEN_PASS_DECL_OMPMARKDECLARETARGETPASS
 #define GEN_PASS_DECL_OMPFUNCTIONFILTERING
 #define GEN_PASS_DECL_VSCALEATTR
+#define GEN_PASS_DECL_FUNCTIONATTR
 #include "flang/Optimizer/Transforms/Passes.h.inc"
 
 std::unique_ptr<mlir::Pass> createAffineDemotionPass();
@@ -75,17 +76,6 @@ std::unique_ptr<mlir::Pass> createVScaleAttrPass();
 std::unique_ptr<mlir::Pass>
 createVScaleAttrPass(std::pair<unsigned, unsigned> vscaleAttr);
 
-struct FunctionAttrTypes {
-  mlir::LLVM::framePointerKind::FramePointerKind framePointerKind =
-      mlir::LLVM::framePointerKind::FramePointerKind::None;
-};
-
-std::unique_ptr<mlir::Pass> createFunctionAttrPass();
-std::unique_ptr<mlir::Pass>
-createFunctionAttrPass(FunctionAttrTypes &functionAttr, bool noInfsFPMath,
-                       bool noNaNsFPMath, bool approxFuncFPMath,
-                       bool noSignedZerosFPMath, bool unsafeFPMath);
-
 void populateCfgConversionRewrites(mlir::RewritePatternSet &patterns,
                                    bool forceLoopToExecuteOnce = false,
                                    bool setNSW = false);

flang/include/flang/Optimizer/Transforms/Passes.td

@@ -394,7 +394,6 @@ def FunctionAttr : Pass<"function-attr", "mlir::func::FuncOp"> {
            "bool", /*default=*/"false",
            "Set the unsafe-fp-math attribute on functions in the module.">,
   ];
-  let constructor = "::fir::createFunctionAttrPass()";
 }
 
 def AssumedRankOpConversion : Pass<"fir-assumed-rank-op", "mlir::ModuleOp"> {

flang/include/flang/Tools/CLOptions.inc

@@ -372,24 +372,22 @@ inline void createDefaultFIRCodeGenPassPipeline(mlir::PassManager &pm,
     pm.addPass(fir::createVScaleAttr({{config.VScaleMin, config.VScaleMax}}));
 
   // Add function attributes
-  fir::FunctionAttrTypes functionAttrs;
+  mlir::LLVM::framePointerKind::FramePointerKind framePointerKind;
 
   if (config.FramePointerKind != llvm::FramePointerKind::None ||
       config.NoInfsFPMath || config.NoNaNsFPMath || config.ApproxFuncFPMath ||
       config.NoSignedZerosFPMath || config.UnsafeFPMath) {
     if (config.FramePointerKind == llvm::FramePointerKind::NonLeaf)
-      functionAttrs.framePointerKind =
+      framePointerKind =
           mlir::LLVM::framePointerKind::FramePointerKind::NonLeaf;
     else if (config.FramePointerKind == llvm::FramePointerKind::All)
-      functionAttrs.framePointerKind =
-          mlir::LLVM::framePointerKind::FramePointerKind::All;
+      framePointerKind = mlir::LLVM::framePointerKind::FramePointerKind::All;
     else
-      functionAttrs.framePointerKind =
-          mlir::LLVM::framePointerKind::FramePointerKind::None;
+      framePointerKind = mlir::LLVM::framePointerKind::FramePointerKind::None;
 
-    pm.addPass(fir::createFunctionAttrPass(functionAttrs, config.NoInfsFPMath,
+    pm.addPass(fir::createFunctionAttr({framePointerKind, config.NoInfsFPMath,
         config.NoNaNsFPMath, config.ApproxFuncFPMath,
-        config.NoSignedZerosFPMath, config.UnsafeFPMath));
+        config.NoSignedZerosFPMath, config.UnsafeFPMath}));
   }
 
   fir::addFIRToLLVMPass(pm, config);

flang/lib/Optimizer/Transforms/FunctionAttr.cpp

@@ -15,7 +15,6 @@
 #include "mlir/Dialect/LLVMIR/LLVMDialect.h"
 
 namespace fir {
-#define GEN_PASS_DECL_FUNCTIONATTR
 #define GEN_PASS_DEF_FUNCTIONATTR
 #include "flang/Optimizer/Transforms/Passes.h.inc"
 } // namespace fir
@@ -76,22 +75,3 @@ void FunctionAttrPass::runOnOperation() {
 
   LLVM_DEBUG(llvm::dbgs() << "=== End " DEBUG_TYPE " ===\n");
 }
-
-std::unique_ptr<mlir::Pass> fir::createFunctionAttrPass(
-    fir::FunctionAttrTypes &functionAttr, bool noInfsFPMath, bool noNaNsFPMath,
-    bool approxFuncFPMath, bool noSignedZerosFPMath, bool unsafeFPMath) {
-  FunctionAttrOptions opts;
-  // Frame pointer
-  opts.framePointerKind = functionAttr.framePointerKind;
-  opts.noInfsFPMath = noInfsFPMath;
-  opts.noNaNsFPMath = noNaNsFPMath;
-  opts.approxFuncFPMath = approxFuncFPMath;
-  opts.noSignedZerosFPMath = noSignedZerosFPMath;
-  opts.unsafeFPMath = unsafeFPMath;
-
-  return std::make_unique<FunctionAttrPass>(opts);
-}
-
-std::unique_ptr<mlir::Pass> fir::createFunctionAttrPass() {
-  return std::make_unique<FunctionAttrPass>();
-}