8292756: java.lang.AssertionError at at jdk.compiler/com.sun.tools.javac.code.Scope$ScopeImpl.leave(Scope.java:386) #10347

lahodaj · 2022-09-19T18:13:27Z

Consider code like:

public class JDK_8292756 {
    private int test(Object o) {
        int i1, i2, i3, i4, i5, i6, i7;
        return switch(o) {
            case Object oo when oo != null -> 0;
            default -> 0;
        };
    }
}

Compiling this leads to a crash:

$ javac --enable-preview -source 19 /tmp/JDK_8292756.java 
Note: /tmp/JDK_8292756.java uses preview features of Java SE 19.
Note: Recompile with -Xlint:preview for details.
An exception has occurred in the compiler (19-internal). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program, the following diagnostic, and the parameters passed to the Java compiler in your report. Thank you.
java.lang.AssertionError
        at jdk.compiler/com.sun.tools.javac.util.Assert.error(Assert.java:155)
        at jdk.compiler/com.sun.tools.javac.util.Assert.check(Assert.java:46)
        at jdk.compiler/com.sun.tools.javac.code.Scope$ScopeImpl.leave(Scope.java:386)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1465)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1082)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:687)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:761)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1253)
        at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:912)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:687)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:761)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:5621)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:5512)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:5336)
        at jdk.compiler/com.sun.tools.javac.comp.Attr.attrib(Attr.java:5275)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1317)
        at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:946)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
        at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
        at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:64)
        at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:50)
printing javac parameters to: /tmp/javac.20220919_200140.args

The reason for the failure is this: in Attr.handleSwitch, there is an input scope env, and a sub-scope of it, switchEnv, is created for the switch. Eventually, another (shared) sub-scope is created for the guard expression, bodyEnv. All env, switchEnv and bodyEnv share an internal table. But, the bodyEnv sub-scope is created from env, not from switchEnv (as it should). Which mostly works, but if the internal table for bodyEnv is resized, it will correctly fix only env, but not switchEnv.

The solution to this problem is to simply base the bodyEnv on switchEnv, not on env. But, in addition to that, it does not seem right the scopes don't protect from an accident like this. So the proposed patch here is enhancing the assertions in Scope so that a shared duplicate of a Scope can only be done from a leaf Scope.

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Issue

JDK-8292756: java.lang.AssertionError at at jdk.compiler/com.sun.tools.javac.code.Scope$ScopeImpl.leave(Scope.java:386)

Reviewers

Vicente Romero (@vicente-romero-oracle - Reviewer)

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Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk pull/10347/head

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$ git pr checkout 10347

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https://git.openjdk.org/jdk/pull/10347.diff

…vac.code.Scope$ScopeImpl.leave(Scope.java:386)

bridgekeeper · 2022-09-19T18:13:57Z

👋 Welcome back jlahoda! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

openjdk · 2022-09-19T18:17:19Z

@lahodaj The following label will be automatically applied to this pull request:

compiler

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mlbridge · 2022-09-19T18:20:33Z

Webrevs

00: Full (7fbcd871)

vicente-romero-oracle

looks good

vicente-romero-oracle · 2022-09-21T14:51:30Z

src/jdk.compiler/share/classes/com/sun/tools/javac/code/Scope.java

         */
-        private int shared;
+        private boolean shared;


openjdk · 2022-09-21T14:53:23Z

@lahodaj This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8292756: java.lang.AssertionError at at jdk.compiler/com.sun.tools.javac.code.Scope$ScopeImpl.leave(Scope.java:386)

Reviewed-by: vromero

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 91 new commits pushed to the master branch:

e195897: 8294068: Unconditional and eager load of nio library since JDK-8264744
84d7ff6: 8288129: Shenandoah: Skynet test crashed with iu + aggressive
07afa3f: 8294110: compiler/uncommontrap/Decompile.java fails after JDK-8293798
0746bcb: 8294083: RISC-V: Minimal build failed with --disable-precompiled-headers
95ec2ea: 8293897: Synthetic final modifier is part of the AST for a try-with-resource resource
d14e96d: 8293493: Signal Handlers printout should show signal block state
da4fdfb: 8293659: Improve UnsatisfiedLinkError error message to include dlopen error details
cd1cdcd: 8293116: Incremental JDK build could be sped up
e9401e6: 8293364: IGV: Refactor Action in EditorTopComponent and fix minor bugs
844a95b: 8292892: Javadoc index descriptions are not deterministic
... and 81 more: https://git.openjdk.org/jdk/compare/7f3250d71c4866a64eb73f52140c669fe90f122f...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

lahodaj · 2022-09-22T14:32:13Z

/integrate

openjdk · 2022-09-22T14:33:19Z

Going to push as commit 0be2b2c.
Since your change was applied there have been 107 commits pushed to the master branch:

bc2af47: 8254711: Add java.security.Provider.getService JFR Event
d781ab0: 8294003: Don't handle si_addr == 0 && si_code == SI_KERNEL SIGSEGVs
a216960: 8294087: RISC-V: RVC: Fix a potential alignment issue and add more alignment assertions for the patchable calls/nops
3fa6778: 8292296: Use multiple threads to process ParallelGC deferred updates
800e68d: 8292044: HttpClient doesn't handle 102 or 103 properly
83abfa5: 8255670: Improve C2's detection of modified nodes
5652030: 8292376: A few Swing methods use inheritDoc on exceptions which are not inherited
03f287d: 8293995: Problem list sun/tools/jstatd/TestJstatdRmiPort.java on all platforms because of 8293577
d5bee4a: 8294086: RISC-V: Cleanup InstructionMark usages in the backend
47f233a: 8292202: modules_do is called without Module_lock
... and 97 more: https://git.openjdk.org/jdk/compare/7f3250d71c4866a64eb73f52140c669fe90f122f...master

Your commit was automatically rebased without conflicts.

openjdk · 2022-09-22T14:33:30Z

@lahodaj Pushed as commit 0be2b2c.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

ice1000 · 2022-09-24T20:45:31Z

Any chance this can be backported to JDK 19?

ice1000 · 2022-09-24T20:48:20Z

Several benefits of backporting to JDK 19:

Build tools like Gradle wouldn't support JDK 20 until GA, so having a serious bug in JDK 19 = having a JDK 19 without record patterns at all.
Users won't be able to extensively test the feature without being able to use the feature. Preview features are supposed to be tested.
Bug-fix updates are supposed to deliver bug-fixes, and this is a bug-fix.

8292756: java.lang.AssertionError at at jdk.compiler/com.sun.tools.ja…

7fbcd87

…vac.code.Scope$ScopeImpl.leave(Scope.java:386)

openjdk bot added the rfr Pull request is ready for review label Sep 19, 2022

openjdk bot added the compiler compiler-dev@openjdk.org label Sep 19, 2022

vicente-romero-oracle approved these changes Sep 21, 2022

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8292756: java.lang.AssertionError at at jdk.compiler/com.sun.tools.javac.code.Scope$ScopeImpl.leave(Scope.java:386) #10347

8292756: java.lang.AssertionError at at jdk.compiler/com.sun.tools.javac.code.Scope$ScopeImpl.leave(Scope.java:386) #10347

lahodaj commented Sep 19, 2022 •

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8292756: java.lang.AssertionError at at jdk.compiler/com.sun.tools.javac.code.Scope$ScopeImpl.leave(Scope.java:386) #10347

8292756: java.lang.AssertionError at at jdk.compiler/com.sun.tools.javac.code.Scope$ScopeImpl.leave(Scope.java:386) #10347

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lahodaj commented Sep 19, 2022 • edited by openjdk bot

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