[turbofan] Add unit tests for ReduceJSCreateArguments.

test/unittests/compiler/js-typed-lowering-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 71 matching lines @@
     MachineOperatorBuilder machine(zone());
     SimplifiedOperatorBuilder simplified(zone());
     JSGraph jsgraph(isolate(), graph(), common(), javascript(), &simplified,
                     &machine);
     // TODO(titzer): mock the GraphReducer here for better unit testing.
     GraphReducer graph_reducer(zone(), graph());
     JSTypedLowering reducer(&graph_reducer, &jsgraph, zone());
     return reducer.Reduce(node);
   }
 
+  Node* FrameState(Handle<SharedFunctionInfo> shared, Node* outer_frame_state) {
+    Node* state_values = graph()->NewNode(common()->StateValues(0));
+    return graph()->NewNode(
+        common()->FrameState(BailoutId::None(),
+                             OutputFrameStateCombine::Ignore(),
+                             common()->CreateFrameStateFunctionInfo(
+                                 FrameStateType::kJavaScriptFunction, 1, 0,
+                                 shared, CALL_MAINTAINS_NATIVE_CONTEXT)),
+        state_values, state_values, state_values, NumberConstant(0),
+        UndefinedConstant(), outer_frame_state);
+  }
+
   Handle<JSArrayBuffer> NewArrayBuffer(void* bytes, size_t byte_length) {
     Handle<JSArrayBuffer> buffer = factory()->NewJSArrayBuffer();
     JSArrayBuffer::Setup(buffer, isolate(), true, bytes, byte_length);
     return buffer;
   }
 
   Matcher<Node*> IsIntPtrConstant(intptr_t value) {
     return sizeof(value) == 4 ? IsInt32Constant(static_cast<int32_t>(value))
                               : IsInt64Constant(static_cast<int64_t>(value));
   }
@@ skipping 876 matching lines @@
     EXPECT_THAT(r.replacement(),
                 IsCall(_, IsHeapConstant(CodeFactory::StringAdd(
                                              isolate(), STRING_ADD_CHECK_NONE,
                                              NOT_TENURED).code()),
                        lhs, rhs, context, frame_state0, effect, control));
   }
 }
 
 
 // -----------------------------------------------------------------------------
+// JSCreateArguments
+
+
+TEST_F(JSTypedLoweringTest, JSCreateArgumentsViaStub) {
+  Node* const closure = Parameter(Type::Any());
+  Node* const context = UndefinedConstant();
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Handle<SharedFunctionInfo> shared(isolate()->object_function()->shared());
+  Node* const frame_state = FrameState(shared, graph()->start());
+  Reduction r = Reduce(
+      graph()->NewNode(javascript()->CreateArguments(
+                           CreateArgumentsParameters::kMappedArguments, 0),
+                       closure, context, frame_state, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(),
+              IsCall(_, IsHeapConstant(CodeFactory::ArgumentsAccess(
+                                           isolate(), false, false)
+                                           .code()),
+                     closure, IsNumberConstant(0), _, effect, control));
+}
+
+
+TEST_F(JSTypedLoweringTest, JSCreateArgumentsInlinedMapped) {
+  Node* const closure = Parameter(Type::Any());
+  Node* const context = UndefinedConstant();
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Handle<SharedFunctionInfo> shared(isolate()->object_function()->shared());
+  Node* const frame_state_outer = FrameState(shared, graph()->start());
+  Node* const frame_state_inner = FrameState(shared, frame_state_outer);
+  Reduction r = Reduce(
+      graph()->NewNode(javascript()->CreateArguments(
+                           CreateArgumentsParameters::kMappedArguments, 0),
+                       closure, context, frame_state_inner, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(),
+              IsFinishRegion(
+                  IsAllocate(IsNumberConstant(Heap::kSloppyArgumentsObjectSize),
+                             IsBeginRegion(effect), control),
+                  _));
+}
+
+
+TEST_F(JSTypedLoweringTest, JSCreateArgumentsInlinedUnmapped) {
+  Node* const closure = Parameter(Type::Any());
+  Node* const context = UndefinedConstant();
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Handle<SharedFunctionInfo> shared(isolate()->object_function()->shared());
+  Node* const frame_state_outer = FrameState(shared, graph()->start());
+  Node* const frame_state_inner = FrameState(shared, frame_state_outer);
+  Reduction r = Reduce(
+      graph()->NewNode(javascript()->CreateArguments(
+                           CreateArgumentsParameters::kUnmappedArguments, 0),
+                       closure, context, frame_state_inner, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(),
+              IsFinishRegion(
+                  IsAllocate(IsNumberConstant(Heap::kStrictArgumentsObjectSize),
+                             IsBeginRegion(effect), control),
+                  _));
+}
+
+
+// -----------------------------------------------------------------------------
 // JSCreateClosure
 
 
 TEST_F(JSTypedLoweringTest, JSCreateClosure) {
   Node* const context = UndefinedConstant();
   Node* const effect = graph()->start();
   Node* const control = graph()->start();
   Handle<SharedFunctionInfo> shared(isolate()->object_function()->shared());
   Reduction r =
       Reduce(graph()->NewNode(javascript()->CreateClosure(shared, NOT_TENURED),
@@ skipping 110 matching lines @@
   EXPECT_THAT(r.replacement(),
               IsFinishRegion(IsAllocate(IsNumberConstant(Context::SizeFor(
                                             Context::MIN_CONTEXT_SLOTS)),
                                         IsBeginRegion(effect), control),
                              _));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8