// Copyright 2015 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/node-properties.h"
#include "test/unittests/test-utils.h"
#include "testing/gmock/include/gmock/gmock.h"

using testing::AnyOf;
using testing::ElementsAre;
using testing::IsNull;

namespace v8 {
namespace internal {
namespace compiler {

typedef TestWithZone NodePropertiesTest;


namespace {

const Operator kMockOperator(IrOpcode::kDead, Operator::kNoProperties,
                             "MockOperator", 0, 0, 0, 1, 0, 0);
const Operator kMockOpEffect(IrOpcode::kDead, Operator::kNoProperties,
                             "MockOpEffect", 0, 1, 0, 1, 1, 0);
const Operator kMockOpControl(IrOpcode::kDead, Operator::kNoProperties,
                              "MockOpControl", 0, 0, 1, 1, 0, 1);

}  // namespace


TEST_F(NodePropertiesTest, ReplaceWithValue_ValueUse) {
  CommonOperatorBuilder common(zone());
  Node* node = Node::New(zone(), 0, &kMockOperator, 0, nullptr, false);
  Node* use_value = Node::New(zone(), 0, common.Return(), 1, &node, false);
  Node* replacement = Node::New(zone(), 0, &kMockOperator, 0, nullptr, false);
  NodeProperties::ReplaceWithValue(node, replacement);
  EXPECT_EQ(replacement, use_value->InputAt(0));
  EXPECT_EQ(0, node->UseCount());
  EXPECT_EQ(1, replacement->UseCount());
  EXPECT_THAT(replacement->uses(), ElementsAre(use_value));
}


TEST_F(NodePropertiesTest, ReplaceWithValue_EffectUse) {
  CommonOperatorBuilder common(zone());
  Node* start = Node::New(zone(), 0, common.Start(1), 0, nullptr, false);
  Node* node = Node::New(zone(), 0, &kMockOpEffect, 1, &start, false);
  Node* use_effect = Node::New(zone(), 0, common.EffectPhi(1), 1, &node, false);
  Node* replacement = Node::New(zone(), 0, &kMockOperator, 0, nullptr, false);
  NodeProperties::ReplaceWithValue(node, replacement);
  EXPECT_EQ(start, use_effect->InputAt(0));
  EXPECT_EQ(0, node->UseCount());
  EXPECT_EQ(2, start->UseCount());
  EXPECT_EQ(0, replacement->UseCount());
  EXPECT_THAT(start->uses(), ElementsAre(node, use_effect));
}


TEST_F(NodePropertiesTest, ReplaceWithValue_ControlUse) {
  CommonOperatorBuilder common(zone());
  Node* start = Node::New(zone(), 0, common.Start(1), 0, nullptr, false);
  Node* node = Node::New(zone(), 0, &kMockOpControl, 1, &start, false);
  Node* success = Node::New(zone(), 0, common.IfSuccess(), 1, &node, false);
  Node* use_control = Node::New(zone(), 0, common.Merge(1), 1, &success, false);
  Node* replacement = Node::New(zone(), 0, &kMockOperator, 0, nullptr, false);
  NodeProperties::ReplaceWithValue(node, replacement);
  EXPECT_EQ(start, use_control->InputAt(0));
  EXPECT_EQ(0, node->UseCount());
  EXPECT_EQ(2, start->UseCount());
  EXPECT_EQ(0, replacement->UseCount());
  EXPECT_THAT(start->uses(), ElementsAre(node, use_control));
}


TEST_F(NodePropertiesTest, FindProjection) {
  CommonOperatorBuilder common(zone());
  Node* start = Node::New(zone(), 0, common.Start(1), 0, nullptr, false);
  Node* proj0 = Node::New(zone(), 1, common.Projection(0), 1, &start, false);
  Node* proj1 = Node::New(zone(), 2, common.Projection(1), 1, &start, false);
  EXPECT_EQ(proj0, NodeProperties::FindProjection(start, 0));
  EXPECT_EQ(proj1, NodeProperties::FindProjection(start, 1));
  EXPECT_THAT(NodeProperties::FindProjection(start, 2), IsNull());
  EXPECT_THAT(NodeProperties::FindProjection(start, 1234567890), IsNull());
}


TEST_F(NodePropertiesTest, CollectControlProjections_Branch) {
  Node* result[2];
  CommonOperatorBuilder common(zone());
  Node* branch = Node::New(zone(), 1, common.Branch(), 0, nullptr, false);
  Node* if_false = Node::New(zone(), 2, common.IfFalse(), 1, &branch, false);
  Node* if_true = Node::New(zone(), 3, common.IfTrue(), 1, &branch, false);
  NodeProperties::CollectControlProjections(branch, result, arraysize(result));
  EXPECT_EQ(if_true, result[0]);
  EXPECT_EQ(if_false, result[1]);
}


TEST_F(NodePropertiesTest, CollectControlProjections_Switch) {
  Node* result[3];
  CommonOperatorBuilder common(zone());
  Node* sw = Node::New(zone(), 1, common.Switch(3), 0, nullptr, false);
  Node* if_default = Node::New(zone(), 2, common.IfDefault(), 1, &sw, false);
  Node* if_value1 = Node::New(zone(), 3, common.IfValue(1), 1, &sw, false);
  Node* if_value2 = Node::New(zone(), 4, common.IfValue(2), 1, &sw, false);
  NodeProperties::CollectControlProjections(sw, result, arraysize(result));
  EXPECT_THAT(result[0], AnyOf(if_value1, if_value2));
  EXPECT_THAT(result[1], AnyOf(if_value1, if_value2));
  EXPECT_EQ(if_default, result[2]);
}

}  // namespace compiler
}  // namespace internal
}  // namespace v8