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v8/test/cctest/compiler/test-node.cc
mstarzinger 16f133001f Move compiler cctests into v8::internal::compiler namespace. 
This moves all cctest files for the compiler to live in the same
namespace as the components they are testing. Hence we can avoid the
forbidden using directives pulling in entire namespaces.

From the Google C++ style guide: "You may not use a using-directive to
make all names from a namespace available". This would be covered by
presubmit linter checks if build/namespaces were not blacklisted.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1424943004

Cr-Commit-Position: refs/heads/master@{#31671}
2015-10-30 09:16:39 +00:00

793 lines
19 KiB
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// Copyright 2013 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.
// TODO(jochen): Remove this after the setting is turned on globally.
#define V8_IMMINENT_DEPRECATION_WARNINGS
#include <functional>
#include "src/compiler/graph.h"
#include "src/compiler/node.h"
#include "src/compiler/operator.h"
#include "test/cctest/cctest.h"
namespace v8 {
namespace internal {
namespace compiler {
#define NONE reinterpret_cast<Node*>(1)
static Operator dummy_operator0(IrOpcode::kParameter, Operator::kNoWrite,
"dummy", 0, 0, 0, 1, 0, 0);
static Operator dummy_operator1(IrOpcode::kParameter, Operator::kNoWrite,
"dummy", 1, 0, 0, 1, 0, 0);
static Operator dummy_operator2(IrOpcode::kParameter, Operator::kNoWrite,
"dummy", 2, 0, 0, 1, 0, 0);
static Operator dummy_operator3(IrOpcode::kParameter, Operator::kNoWrite,
"dummy", 3, 0, 0, 1, 0, 0);
#define CHECK_USES(node, ...) \
do { \
Node* __array[] = {__VA_ARGS__}; \
int __size = \
__array[0] != NONE ? static_cast<int>(arraysize(__array)) : 0; \
CheckUseChain(node, __array, __size); \
} while (false)
namespace {
typedef std::multiset<Node*, std::less<Node*>> NodeMSet;
void CheckUseChain(Node* node, Node** uses, int use_count) {
// Check ownership.
if (use_count == 1) CHECK(node->OwnedBy(uses[0]));
if (use_count > 1) {
for (int i = 0; i < use_count; i++) {
CHECK(!node->OwnedBy(uses[i]));
}
}
// Check the self-reported use count.
CHECK_EQ(use_count, node->UseCount());
// Build the expectation set.
NodeMSet expect_set;
for (int i = 0; i < use_count; i++) {
expect_set.insert(uses[i]);
}
{
// Check that iterating over the uses gives the right counts.
NodeMSet use_set;
for (auto use : node->uses()) {
use_set.insert(use);
}
CHECK(expect_set == use_set);
}
{
// Check that iterating over the use edges gives the right counts,
// input indices, from(), and to() pointers.
NodeMSet use_set;
for (auto edge : node->use_edges()) {
CHECK_EQ(node, edge.to());
CHECK_EQ(node, edge.from()->InputAt(edge.index()));
use_set.insert(edge.from());
}
CHECK(expect_set == use_set);
}
{
// Check the use nodes actually have the node as inputs.
for (Node* use : node->uses()) {
size_t count = 0;
for (Node* input : use->inputs()) {
if (input == node) count++;
}
CHECK_EQ(count, expect_set.count(use));
}
}
}
void CheckInputs(Node* node, Node** inputs, int input_count) {
CHECK_EQ(input_count, node->InputCount());
// Check InputAt().
for (int i = 0; i < static_cast<int>(input_count); i++) {
CHECK_EQ(inputs[i], node->InputAt(i));
}
// Check input iterator.
int index = 0;
for (Node* input : node->inputs()) {
CHECK_EQ(inputs[index], input);
index++;
}
// Check use lists of inputs.
for (int i = 0; i < static_cast<int>(input_count); i++) {
Node* input = inputs[i];
if (!input) continue; // skip null inputs
bool found = false;
// Check regular use list.
for (Node* use : input->uses()) {
if (use == node) {
found = true;
break;
}
}
CHECK(found);
int count = 0;
// Check use edge list.
for (auto edge : input->use_edges()) {
if (edge.from() == node && edge.to() == input && edge.index() == i) {
count++;
}
}
CHECK_EQ(1, count);
}
}
} // namespace
#define CHECK_INPUTS(node, ...) \
do { \
Node* __array[] = {__VA_ARGS__}; \
int __size = \
__array[0] != NONE ? static_cast<int>(arraysize(__array)) : 0; \
CheckInputs(node, __array, __size); \
} while (false)
TEST(NodeUseIteratorReplaceUses) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
Node* n3 = graph.NewNode(&dummy_operator0);
CHECK_USES(n0, n1, n2);
CHECK_INPUTS(n1, n0);
CHECK_INPUTS(n2, n0);
n0->ReplaceUses(n3);
CHECK_USES(n0, NONE);
CHECK_USES(n1, NONE);
CHECK_USES(n2, NONE);
CHECK_USES(n3, n1, n2);
CHECK_INPUTS(n1, n3);
CHECK_INPUTS(n2, n3);
}
TEST(NodeUseIteratorReplaceUsesSelf) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
CHECK_USES(n0, n1);
CHECK_USES(n1, NONE);
n1->ReplaceInput(0, n1); // Create self-reference.
CHECK_USES(n0, NONE);
CHECK_USES(n1, n1);
Node* n2 = graph.NewNode(&dummy_operator0);
n1->ReplaceUses(n2);
CHECK_USES(n0, NONE);
CHECK_USES(n1, NONE);
CHECK_USES(n2, n1);
}
TEST(ReplaceInput) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator0);
Node* n3 = graph.NewNode(&dummy_operator3, n0, n1, n2);
Node* n4 = graph.NewNode(&dummy_operator0);
CHECK_USES(n0, n3);
CHECK_USES(n1, n3);
CHECK_USES(n2, n3);
CHECK_USES(n3, NONE);
CHECK_USES(n4, NONE);
CHECK_INPUTS(n3, n0, n1, n2);
n3->ReplaceInput(1, n4);
CHECK_USES(n1, NONE);
CHECK_USES(n4, n3);
CHECK_INPUTS(n3, n0, n4, n2);
}
TEST(OwnedBy) {
Zone zone;
Graph graph(&zone);
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
CHECK(!n0->OwnedBy(n1));
CHECK(!n1->OwnedBy(n0));
Node* n2 = graph.NewNode(&dummy_operator1, n0);
CHECK(n0->OwnedBy(n2));
CHECK(!n2->OwnedBy(n0));
Node* n3 = graph.NewNode(&dummy_operator1, n0);
CHECK(!n0->OwnedBy(n2));
CHECK(!n0->OwnedBy(n3));
CHECK(!n2->OwnedBy(n0));
CHECK(!n3->OwnedBy(n0));
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
CHECK(n0->OwnedBy(n1));
CHECK(!n1->OwnedBy(n0));
Node* n2 = graph.NewNode(&dummy_operator1, n0);
CHECK(!n0->OwnedBy(n1));
CHECK(!n0->OwnedBy(n2));
CHECK(!n1->OwnedBy(n0));
CHECK(!n1->OwnedBy(n2));
CHECK(!n2->OwnedBy(n0));
CHECK(!n2->OwnedBy(n1));
Node* n3 = graph.NewNode(&dummy_operator0);
n2->ReplaceInput(0, n3);
CHECK(n0->OwnedBy(n1));
CHECK(!n1->OwnedBy(n0));
CHECK(!n1->OwnedBy(n0));
CHECK(!n1->OwnedBy(n2));
CHECK(!n2->OwnedBy(n0));
CHECK(!n2->OwnedBy(n1));
CHECK(n3->OwnedBy(n2));
CHECK(!n2->OwnedBy(n3));
}
}
TEST(Uses) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
CHECK_USES(n0, n1);
CHECK_USES(n1, NONE);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
CHECK_USES(n0, n1, n2);
CHECK_USES(n2, NONE);
Node* n3 = graph.NewNode(&dummy_operator1, n0);
CHECK_USES(n0, n1, n2, n3);
CHECK_USES(n3, NONE);
}
TEST(Inputs) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
Node* n3 = graph.NewNode(&dummy_operator3, n0, n1, n2);
CHECK_INPUTS(n3, n0, n1, n2);
Node* n4 = graph.NewNode(&dummy_operator3, n0, n1, n2);
n3->AppendInput(graph.zone(), n4);
CHECK_INPUTS(n3, n0, n1, n2, n4);
CHECK_USES(n4, n3);
n3->AppendInput(graph.zone(), n4);
CHECK_INPUTS(n3, n0, n1, n2, n4, n4);
CHECK_USES(n4, n3, n3);
Node* n5 = graph.NewNode(&dummy_operator1, n4);
CHECK_USES(n4, n3, n3, n5);
}
TEST(RemoveInput) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
Node* n2 = graph.NewNode(&dummy_operator2, n0, n1);
CHECK_INPUTS(n0, NONE);
CHECK_INPUTS(n1, n0);
CHECK_INPUTS(n2, n0, n1);
CHECK_USES(n0, n1, n2);
n1->RemoveInput(0);
CHECK_INPUTS(n1, NONE);
CHECK_USES(n0, n2);
n2->RemoveInput(0);
CHECK_INPUTS(n2, n1);
CHECK_USES(n0, NONE);
CHECK_USES(n1, n2);
n2->RemoveInput(0);
CHECK_INPUTS(n2, NONE);
CHECK_USES(n0, NONE);
CHECK_USES(n1, NONE);
CHECK_USES(n2, NONE);
}
TEST(AppendInputsAndIterator) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
Node* n2 = graph.NewNode(&dummy_operator2, n0, n1);
CHECK_INPUTS(n0, NONE);
CHECK_INPUTS(n1, n0);
CHECK_INPUTS(n2, n0, n1);
CHECK_USES(n0, n1, n2);
Node* n3 = graph.NewNode(&dummy_operator0);
n2->AppendInput(graph.zone(), n3);
CHECK_INPUTS(n2, n0, n1, n3);
CHECK_USES(n3, n2);
}
TEST(NullInputsSimple) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
Node* n2 = graph.NewNode(&dummy_operator2, n0, n1);
CHECK_INPUTS(n0, NONE);
CHECK_INPUTS(n1, n0);
CHECK_INPUTS(n2, n0, n1);
CHECK_USES(n0, n1, n2);
n2->ReplaceInput(0, nullptr);
CHECK_INPUTS(n2, NULL, n1);
CHECK_USES(n0, n1);
n2->ReplaceInput(1, nullptr);
CHECK_INPUTS(n2, NULL, NULL);
CHECK_USES(n1, NONE);
}
TEST(NullInputsAppended) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
Node* n3 = graph.NewNode(&dummy_operator1, n0);
n3->AppendInput(graph.zone(), n1);
n3->AppendInput(graph.zone(), n2);
CHECK_INPUTS(n3, n0, n1, n2);
CHECK_USES(n0, n1, n2, n3);
CHECK_USES(n1, n3);
CHECK_USES(n2, n3);
n3->ReplaceInput(1, NULL);
CHECK_USES(n1, NONE);
CHECK_INPUTS(n3, n0, NULL, n2);
}
TEST(ReplaceUsesFromAppendedInputs) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
Node* n3 = graph.NewNode(&dummy_operator0);
CHECK_INPUTS(n2, n0);
n2->AppendInput(graph.zone(), n1);
CHECK_INPUTS(n2, n0, n1);
CHECK_USES(n1, n2);
n2->AppendInput(graph.zone(), n0);
CHECK_INPUTS(n2, n0, n1, n0);
CHECK_USES(n1, n2);
CHECK_USES(n0, n2, n1, n2);
n0->ReplaceUses(n3);
CHECK_USES(n0, NONE);
CHECK_INPUTS(n2, n3, n1, n3);
CHECK_USES(n3, n2, n1, n2);
}
TEST(ReplaceInputMultipleUses) {
Zone zone;
Graph graph(&zone);
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
n2->ReplaceInput(0, n1);
CHECK_EQ(0, n0->UseCount());
CHECK_EQ(1, n1->UseCount());
Node* n3 = graph.NewNode(&dummy_operator1, n0);
n3->ReplaceInput(0, n1);
CHECK_EQ(0, n0->UseCount());
CHECK_EQ(2, n1->UseCount());
}
TEST(TrimInputCountInline) {
Zone zone;
Graph graph(&zone);
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
n1->TrimInputCount(1);
CHECK_INPUTS(n1, n0);
CHECK_USES(n0, n1);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
n1->TrimInputCount(0);
CHECK_INPUTS(n1, NONE);
CHECK_USES(n0, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator2, n0, n1);
n2->TrimInputCount(2);
CHECK_INPUTS(n2, n0, n1);
CHECK_USES(n0, n2);
CHECK_USES(n1, n2);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator2, n0, n1);
n2->TrimInputCount(1);
CHECK_INPUTS(n2, n0);
CHECK_USES(n0, n2);
CHECK_USES(n1, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator2, n0, n1);
n2->TrimInputCount(0);
CHECK_INPUTS(n2, NONE);
CHECK_USES(n0, NONE);
CHECK_USES(n1, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator2, n0, n0);
n2->TrimInputCount(1);
CHECK_INPUTS(n2, n0);
CHECK_USES(n0, n2);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator2, n0, n0);
n2->TrimInputCount(0);
CHECK_INPUTS(n2, NONE);
CHECK_USES(n0, NONE);
}
}
TEST(TrimInputCountOutOfLine1) {
Zone zone;
Graph graph(&zone);
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
n1->AppendInput(graph.zone(), n0);
CHECK_INPUTS(n1, n0);
CHECK_USES(n0, n1);
n1->TrimInputCount(1);
CHECK_INPUTS(n1, n0);
CHECK_USES(n0, n1);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
n1->AppendInput(graph.zone(), n0);
CHECK_EQ(1, n1->InputCount());
n1->TrimInputCount(0);
CHECK_EQ(0, n1->InputCount());
CHECK_EQ(0, n0->UseCount());
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator0);
n2->AppendInput(graph.zone(), n0);
n2->AppendInput(graph.zone(), n1);
CHECK_INPUTS(n2, n0, n1);
n2->TrimInputCount(2);
CHECK_INPUTS(n2, n0, n1);
CHECK_USES(n0, n2);
CHECK_USES(n1, n2);
CHECK_USES(n2, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator0);
n2->AppendInput(graph.zone(), n0);
n2->AppendInput(graph.zone(), n1);
CHECK_INPUTS(n2, n0, n1);
n2->TrimInputCount(1);
CHECK_INPUTS(n2, n0);
CHECK_USES(n0, n2);
CHECK_USES(n1, NONE);
CHECK_USES(n2, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator0);
n2->AppendInput(graph.zone(), n0);
n2->AppendInput(graph.zone(), n1);
CHECK_INPUTS(n2, n0, n1);
n2->TrimInputCount(0);
CHECK_INPUTS(n2, NONE);
CHECK_USES(n0, NONE);
CHECK_USES(n1, NONE);
CHECK_USES(n2, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator0);
n2->AppendInput(graph.zone(), n0);
n2->AppendInput(graph.zone(), n0);
CHECK_INPUTS(n2, n0, n0);
CHECK_USES(n0, n2, n2);
n2->TrimInputCount(1);
CHECK_INPUTS(n2, n0);
CHECK_USES(n0, n2);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator0);
n2->AppendInput(graph.zone(), n0);
n2->AppendInput(graph.zone(), n0);
CHECK_INPUTS(n2, n0, n0);
CHECK_USES(n0, n2, n2);
n2->TrimInputCount(0);
CHECK_INPUTS(n2, NONE);
CHECK_USES(n0, NONE);
}
}
TEST(TrimInputCountOutOfLine2) {
Zone zone;
Graph graph(&zone);
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
n2->AppendInput(graph.zone(), n1);
CHECK_INPUTS(n2, n0, n1);
n2->TrimInputCount(2);
CHECK_INPUTS(n2, n0, n1);
CHECK_USES(n0, n2);
CHECK_USES(n1, n2);
CHECK_USES(n2, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
n2->AppendInput(graph.zone(), n1);
CHECK_INPUTS(n2, n0, n1);
n2->TrimInputCount(1);
CHECK_INPUTS(n2, n0);
CHECK_USES(n0, n2);
CHECK_USES(n1, NONE);
CHECK_USES(n2, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
n2->AppendInput(graph.zone(), n1);
CHECK_INPUTS(n2, n0, n1);
n2->TrimInputCount(0);
CHECK_INPUTS(n2, NONE);
CHECK_USES(n0, NONE);
CHECK_USES(n1, NONE);
CHECK_USES(n2, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
n2->AppendInput(graph.zone(), n0);
CHECK_INPUTS(n2, n0, n0);
CHECK_USES(n0, n2, n2);
n2->TrimInputCount(1);
CHECK_INPUTS(n2, n0);
CHECK_USES(n0, n2);
CHECK_USES(n2, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n2 = graph.NewNode(&dummy_operator1, n0);
n2->AppendInput(graph.zone(), n0);
CHECK_EQ(2, n2->InputCount());
CHECK_EQ(2, n0->UseCount());
n2->TrimInputCount(0);
CHECK_EQ(0, n2->InputCount());
CHECK_EQ(0, n0->UseCount());
CHECK_EQ(0, n2->UseCount());
}
}
TEST(NullAllInputs) {
Zone zone;
Graph graph(&zone);
for (int i = 0; i < 2; i++) {
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
Node* n2;
if (i == 0) {
n2 = graph.NewNode(&dummy_operator2, n0, n1);
CHECK_INPUTS(n2, n0, n1);
} else {
n2 = graph.NewNode(&dummy_operator1, n0);
CHECK_INPUTS(n2, n0);
n2->AppendInput(graph.zone(), n1); // with out-of-line input.
CHECK_INPUTS(n2, n0, n1);
}
n0->NullAllInputs();
CHECK_INPUTS(n0, NONE);
CHECK_USES(n0, n1, n2);
n1->NullAllInputs();
CHECK_INPUTS(n1, NULL);
CHECK_INPUTS(n2, n0, n1);
CHECK_USES(n0, n2);
n2->NullAllInputs();
CHECK_INPUTS(n1, NULL);
CHECK_INPUTS(n2, NULL, NULL);
CHECK_USES(n0, NONE);
}
{
Node* n0 = graph.NewNode(&dummy_operator0);
Node* n1 = graph.NewNode(&dummy_operator1, n0);
n1->ReplaceInput(0, n1); // self-reference.
CHECK_INPUTS(n0, NONE);
CHECK_INPUTS(n1, n1);
CHECK_USES(n0, NONE);
CHECK_USES(n1, n1);
n1->NullAllInputs();
CHECK_INPUTS(n0, NONE);
CHECK_INPUTS(n1, NULL);
CHECK_USES(n0, NONE);
CHECK_USES(n1, NONE);
}
}
TEST(AppendAndTrim) {
Zone zone;
Graph graph(&zone);
Node* nodes[] = {
graph.NewNode(&dummy_operator0), graph.NewNode(&dummy_operator0),
graph.NewNode(&dummy_operator0), graph.NewNode(&dummy_operator0),
graph.NewNode(&dummy_operator0)};
int max = static_cast<int>(arraysize(nodes));
Node* last = graph.NewNode(&dummy_operator0);
for (int i = 0; i < max; i++) {
last->AppendInput(graph.zone(), nodes[i]);
CheckInputs(last, nodes, i + 1);
for (int j = 0; j < max; j++) {
if (j <= i) CHECK_USES(nodes[j], last);
if (j > i) CHECK_USES(nodes[j], NONE);
}
CHECK_USES(last, NONE);
}
for (int i = max; i >= 0; i--) {
last->TrimInputCount(i);
CheckInputs(last, nodes, i);
for (int j = 0; j < i; j++) {
if (j < i) CHECK_USES(nodes[j], last);
if (j >= i) CHECK_USES(nodes[j], NONE);
}
CHECK_USES(last, NONE);
}
}
} // namespace compiler
} // namespace internal
} // namespace v8
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