[turbofan] Some common operators are globally shared singletons.

src/compiler/common-operator-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/compiler/common-operator.h"
+
 #include "src/compiler/operator-properties-inl.h"
 #include "src/test/test-utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
+
+// -----------------------------------------------------------------------------
+// Shared operators.
+
+
+namespace {
+
+struct SharedOperator {
+  const Operator* (CommonOperatorBuilder::*constructor)();
+  IrOpcode::Value opcode;
+  Operator::Properties properties;
+  int value_input_count;
+  int effect_input_count;
+  int control_input_count;
+  int effect_output_count;
+  int control_output_count;
+};
+
+
+std::ostream& operator<<(std::ostream& os, const SharedOperator& fop) {
+  return os << IrOpcode::Mnemonic(fop.opcode);
+}
+
+
+const SharedOperator kSharedOperators[] = {
+#define SHARED(Name, properties, value_input_count, effect_input_count,        \
+               control_input_count, effect_output_count, control_output_count) \
+  {                                                                            \
+    &CommonOperatorBuilder::Name, IrOpcode::k##Name, properties,               \
+        value_input_count, effect_input_count, control_input_count,            \
+        effect_output_count, control_output_count                              \
+  }
+    SHARED(Dead, Operator::kFoldable, 0, 0, 0, 0, 1),
+    SHARED(End, Operator::kFoldable, 0, 0, 1, 0, 0),
+    SHARED(Branch, Operator::kFoldable, 1, 0, 1, 0, 2),
+    SHARED(IfTrue, Operator::kFoldable, 0, 0, 1, 0, 1),
+    SHARED(IfFalse, Operator::kFoldable, 0, 0, 1, 0, 1),
+    SHARED(Throw, Operator::kFoldable, 1, 0, 1, 0, 1),
+    SHARED(Return, Operator::kNoProperties, 1, 1, 1, 1, 1),
+    SHARED(ControlEffect, Operator::kPure, 0, 0, 1, 1, 0)
+#undef SHARED
+};
+
+
+class CommonSharedOperatorTest
+    : public TestWithZone,
+      public ::testing::WithParamInterface<SharedOperator> {};
+
+}  // namespace
+
+
+TEST_P(CommonSharedOperatorTest, InstancesAreGloballyShared) {
+  const SharedOperator& sop = GetParam();
+  CommonOperatorBuilder common1(zone());
+  CommonOperatorBuilder common2(zone());
+  EXPECT_EQ((common1.*sop.constructor)(), (common2.*sop.constructor)());
+}
+
+
+TEST_P(CommonSharedOperatorTest, NumberOfInputsAndOutputs) {
+  CommonOperatorBuilder common(zone());
+  const SharedOperator& sop = GetParam();
+  const Operator* op = (common.*sop.constructor)();
+
+  EXPECT_EQ(sop.value_input_count, OperatorProperties::GetValueInputCount(op));
+  EXPECT_EQ(sop.effect_input_count,
+            OperatorProperties::GetEffectInputCount(op));
+  EXPECT_EQ(sop.control_input_count,
+            OperatorProperties::GetControlInputCount(op));
+  EXPECT_EQ(
+      sop.value_input_count + sop.effect_input_count + sop.control_input_count,
+      OperatorProperties::GetTotalInputCount(op));
+
+  EXPECT_EQ(0, OperatorProperties::GetValueOutputCount(op));
+  EXPECT_EQ(sop.effect_output_count,
+            OperatorProperties::GetEffectOutputCount(op));
+  EXPECT_EQ(sop.control_output_count,
+            OperatorProperties::GetControlOutputCount(op));
+}
+
+
+TEST_P(CommonSharedOperatorTest, OpcodeIsCorrect) {
+  CommonOperatorBuilder common(zone());
+  const SharedOperator& sop = GetParam();
+  const Operator* op = (common.*sop.constructor)();
+  EXPECT_EQ(sop.opcode, op->opcode());
+}
+
+
+TEST_P(CommonSharedOperatorTest, Properties) {
+  CommonOperatorBuilder common(zone());
+  const SharedOperator& sop = GetParam();
+  const Operator* op = (common.*sop.constructor)();
+  EXPECT_EQ(sop.properties, op->properties());
+}
+
+
+INSTANTIATE_TEST_CASE_P(CommonOperatorTest, CommonSharedOperatorTest,
+                        ::testing::ValuesIn(kSharedOperators));
+
+
+// -----------------------------------------------------------------------------
+// Other operators.
+
+
 namespace {
 
 class CommonOperatorTest : public TestWithZone {
  public:
   CommonOperatorTest() : common_(zone()) {}
   virtual ~CommonOperatorTest() {}
 
   CommonOperatorBuilder* common() { return &common_; }
 
  private:
   CommonOperatorBuilder common_;
 };
 
 
 const int kArguments[] = {1, 5, 6, 42, 100, 10000, kMaxInt};
 
 }  // namespace
 
 
-TEST_F(CommonOperatorTest, ControlEffect) {
-  const Operator* op = common()->ControlEffect();
-  EXPECT_EQ(1, OperatorProperties::GetControlInputCount(op));
-  EXPECT_EQ(1, OperatorProperties::GetTotalInputCount(op));
-  EXPECT_EQ(0, OperatorProperties::GetControlOutputCount(op));
-  EXPECT_EQ(1, OperatorProperties::GetEffectOutputCount(op));
-  EXPECT_EQ(0, OperatorProperties::GetValueOutputCount(op));
-}
-
-
 TEST_F(CommonOperatorTest, ValueEffect) {
   TRACED_FOREACH(int, arguments, kArguments) {
     const Operator* op = common()->ValueEffect(arguments);
     EXPECT_EQ(arguments, OperatorProperties::GetValueInputCount(op));
     EXPECT_EQ(arguments, OperatorProperties::GetTotalInputCount(op));
     EXPECT_EQ(0, OperatorProperties::GetControlOutputCount(op));
     EXPECT_EQ(1, OperatorProperties::GetEffectOutputCount(op));
     EXPECT_EQ(0, OperatorProperties::GetValueOutputCount(op));
   }
 }
 
 
 TEST_F(CommonOperatorTest, Finish) {
   TRACED_FOREACH(int, arguments, kArguments) {
     const Operator* op = common()->Finish(arguments);
     EXPECT_EQ(1, OperatorProperties::GetValueInputCount(op));
     EXPECT_EQ(arguments, OperatorProperties::GetEffectInputCount(op));
     EXPECT_EQ(arguments + 1, OperatorProperties::GetTotalInputCount(op));
     EXPECT_EQ(0, OperatorProperties::GetControlOutputCount(op));
     EXPECT_EQ(0, OperatorProperties::GetEffectOutputCount(op));
     EXPECT_EQ(1, OperatorProperties::GetValueOutputCount(op));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8