[CIR] Add test for begin/end range for statements

clang/lib/CIR/CodeGen/CIRGenCall.cpp

@@ -304,7 +304,7 @@ void CIRGenFunction::emitCallArg(CallArgList &args, const clang::Expr *e,
 
   if (e->isGLValue()) {
     assert(e->getObjectKind() == OK_Ordinary);
-    args.add(emitReferenceBindingToExpr(e), argType);
+    return args.add(emitReferenceBindingToExpr(e), argType);
   }
 
   bool hasAggregateEvalKind = hasAggregateEvaluationKind(argType);

clang/test/CIR/CodeGen/forrange.cpp

@@ -0,0 +1,49 @@
+// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o %t.cir
+// RUN: FileCheck --input-file=%t.cir %s --check-prefix=CIR
+
+struct Element {};
+struct Container {};
+
+Element *begin(Container &);
+Element *end(Container &);
+
+void for_range() {
+  Container c;
+  for (Element &e : c)
+    ;
+}
+
+// CIR: cir.func @_Z5beginR9Container(!cir.ptr<!rec_Container>) -> !cir.ptr<!rec_Element>
+// CIR: cir.func @_Z3endR9Container(!cir.ptr<!rec_Container>) -> !cir.ptr<!rec_Element
+
+// CIR: cir.func @_Z9for_rangev()
+// CIR:    %[[C_ADDR:.*]] = cir.alloca !rec_Container{{.*}} ["c"]
+// CIR:    cir.scope {
+// CIR:      %[[RANGE_ADDR:.*]] = cir.alloca !cir.ptr<!rec_Container>{{.*}} ["__range1", init, const]
+// CIR:      %[[BEGIN_ADDR:.*]] = cir.alloca !cir.ptr<!rec_Element>{{.*}} ["__begin1", init]
+// CIR:      %[[END_ADDR:.*]] = cir.alloca !cir.ptr<!rec_Element>{{.*}} ["__end1", init]
+// CIR:      %[[E_ADDR:.*]] = cir.alloca !cir.ptr<!rec_Element>{{.*}} ["e", init, const]
+// CIR:      cir.store %[[C_ADDR]], %[[RANGE_ADDR]]
+// CIR:      %[[C_REF:.*]] = cir.load %[[RANGE_ADDR]]
+// CIR:      %[[BEGIN:.*]] = cir.call @_Z5beginR9Container(%[[C_REF]])
+// CIR:      cir.store %[[BEGIN]], %[[BEGIN_ADDR]]
+// CIR:      %[[C_REF2:.*]] = cir.load %[[RANGE_ADDR]]
+// CIR:      %[[END:.*]] = cir.call @_Z3endR9Container(%[[C_REF2]])
+// CIR:      cir.store %[[END]], %[[END_ADDR]]
+// CIR:      cir.for : cond {
+// CIR:        %[[BEGIN:.*]] = cir.load %[[BEGIN_ADDR]]
+// CIR:        %[[END:.*]] = cir.load %[[END_ADDR]]
+// CIR:        %[[CMP:.*]] = cir.cmp(ne, %[[BEGIN]], %[[END]])
+// CIR:        cir.condition(%[[CMP]])
+// CIR:      } body {
+// CIR:        %[[E:.*]] = cir.load deref %[[BEGIN_ADDR]]
+// CIR:        cir.store %[[E]], %[[E_ADDR]]
+// CIR:        cir.yield
+// CIR:      } step {
+// CIR:        %[[BEGIN:.*]] = cir.load %[[BEGIN_ADDR]]
+// CIR:        %[[STEP:.*]] = cir.const #cir.int<1>
+// CIR:        %[[NEXT:.*]] = cir.ptr_stride(%[[BEGIN]] {{.*}}, %[[STEP]] {{.*}})
+// CIR:        cir.store %[[NEXT]], %[[BEGIN_ADDR]]
+// CIR:        cir.yield
+// CIR:      }
+// CIR:    }