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Java: reduce call stack usage in the parser for extremely large else-if chains (IDEA-305898)

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GitOrigin-RevId: 9d7be3efbe108e604fbd67ce03c7fdfe23c3fb3a
This commit is contained in:
Bas Leijdekkers
2024-09-20 13:38:16 +02:00
committed by intellij-monorepo-bot
parent 8966e5a5b5
commit 3e7bc7ef47
3 changed files with 3294 additions and 21 deletions
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32
java/java-frontback-tests/testSrc/com/intellij/java/parser/statementParsing/AbstractBasicIfParsingTest.java
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@@ -1,30 +1,44 @@
// Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
// Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
package com.intellij.java.parser.statementParsing;
import com.intellij.java.parser.AbstractBasicJavaParsingTestCase;
import com.intellij.java.parser.AbstractBasicJavaParsingTestConfigurator;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiRecursiveElementWalkingVisitor;
import org.jetbrains.annotations.NotNull;
import java.io.IOException;
public abstract class AbstractBasicIfParsingTest extends AbstractBasicJavaParsingTestCase {
public AbstractBasicIfParsingTest(@NotNull AbstractBasicJavaParsingTestConfigurator configurator) {
super("parser-full/statementParsing/if", configurator);
}
public void testNormalWithElse() { doTest(true); }
public void testNormalNoElse() { doTest(true); }
public void testUncomplete1() { doTest(true); }
public void testUncomplete2() { doTest(true); }
public void testUncomplete3() { doTest(true); }
public void testUncomplete4() { doTest(true); }
public void testUncomplete5() { doTest(true); }
public void testUncomplete6() { doTest(true); }
public void testUncomplete7() { doTest(true); }
public void testBigIf() throws IOException {
String name = getTestName();
PsiFile file = createPsiFile(name, loadFile(name + "." + myFileExt));
var visitor = new PsiRecursiveElementWalkingVisitor() {
int count = 0;
@Override
public void visitElement(@NotNull PsiElement element) {
// visit all elements to make sure the file is parsed, because createPsiFile() is lazy
super.visitElement(element);
count++;
}
};
file.accept(visitor);
// psi tree is too big and too deeply nested to fit a debug string into memory
assertEquals(46946, visitor.count);
}
}