Support __builtin_frame_address

Author: ghehg

clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp

@@ -1592,18 +1592,21 @@ RValue CIRGenFunction::emitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
     llvm_unreachable("BI__builtin_wmemcmp NYI");
   case Builtin::BI__builtin_dwarf_cfa:
     llvm_unreachable("BI__builtin_dwarf_cfa NYI");
-  case Builtin::BI__builtin_return_address: {
+  case Builtin::BI__builtin_return_address:
+  case Builtin::BI__builtin_frame_address: {
     mlir::Location loc = getLoc(E->getExprLoc());
     mlir::Attribute levelAttr = ConstantEmitter(*this).emitAbstract(
         E->getArg(0), E->getArg(0)->getType());
     int64_t level = mlir::cast<cir::IntAttr>(levelAttr).getSInt();
     return RValue::get(builder.create<cir::FuncAddrBuiltinOp>(
-        loc, cir::FuncAddrKind::return_address, builder.getUInt32(level, loc)));
+        loc,
+        BuiltinID == Builtin::BI__builtin_return_address
+            ? cir::FuncAddrKind::return_address
+            : cir::FuncAddrKind::frame_address,
+        builder.getUInt32(level, loc)));
   }
   case Builtin::BI_ReturnAddress:
     llvm_unreachable("BI_ReturnAddress NYI");
-  case Builtin::BI__builtin_frame_address:
-    llvm_unreachable("BI__builtin_frame_address NYI");
   case Builtin::BI__builtin_extract_return_addr:
     llvm_unreachable("BI__builtin_extract_return_addr NYI");
   case Builtin::BI__builtin_frob_return_addr:

clang/test/CIR/CodeGen/builtins.cpp

@@ -105,3 +105,14 @@ extern "C" void *test_return_address(void) {
   // LLVM-LABEL: @test_return_address
   // LLVM: {{%.*}} = call ptr @llvm.returnaddress(i32 1)
 }
+
+extern "C" void *test_frame_address(void) {
+  return __builtin_frame_address(1);
+
+  // CIR-LABEL: test_frame_address
+  // CIR: [[ARG:%.*]] = cir.const #cir.int<1> : !u32i
+  // CIR: {{%.*}} = cir.func_addr_builtin(frame_address, [[ARG]])
+
+  // LLVM-LABEL: @test_frame_address
+  // LLVM: {{%.*}} = call ptr @llvm.frameaddress.p0(i32 1)
+}

clang/test/CIR/IR/builtins.cir

@@ -5,10 +5,12 @@ module  {
   cir.func @test1() {
     %0 = cir.const #cir.int<1> : !u32i
     %1 = cir.func_addr_builtin(return_address, %0)
+    %2 = cir.func_addr_builtin(frame_address, %0)
     cir.return
   }
   // CHECK:  cir.func @test1()
   // CHECK:  %0 = cir.const #cir.int<1> : !u32i
   // CHECK:  %1 = cir.func_addr_builtin(return_address, %0)
+  // CHECK:  %2 = cir.func_addr_builtin(frame_address, %0)
   // CHECK: cir.return
 }