8373094: javac may fail because of unattributed break in a loop

[lahodaj]

Consider a case like this:

package test;
public class Intermediate<T> extends Base<T> {}

package test;
public class Base<T> {
    public void t(Missing<T> m) {}
}
package test;
public class Missing<T> {}

this is compiled, and then Missing is deleted. Then a test file is compiled with the above classes on the classpath:

$ cat src/test/Test.java 
package test;
public class Test extends Intermediate<String> {
    private void test() {
        while (true) { break; }
    }
}
$ javac -XDdev -XDshould-stop.at=FLOW -d classes -classpath classes src/test/Test.java
src/test/Test.java:2: error: cannot access Missing
public class Test extends Intermediate<String> {
       ^
  class file for test.Missing not found
1 error
An exception has occurred in the compiler (25.0.1). Please file a bug against the Java compiler via the Java bug reporting page (https://bugreport.java.com) after checking the Bug Database (https://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.comp.Flow$AliveAnalyzer.clearPendingExits(Flow.java:631)
        at jdk.compiler/com.sun.tools.javac.comp.Flow$AliveAnalyzer.visitMethodDef(Flow.java:619)
...

The reason is that the CompletionFailure will be thrown from chk.checkCompatibleSupertypes(tree.pos(), c.type);, and since that's before attributing the method bodies, the method bodies will remain blank. And hence the break will have no target set, and Flow will fail on it.

I spent some time trying to figure out if we could improve handling on CompletionFailures more generally, so that we would not need to catch them on more-or-less arbitrary places. But everything I was able to do so far didn't really improve the situation. So the proposal herein is to catch and handle the CompletionFailure on some place.

---

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Warning

 ⚠️ Found leading lowercase letter in issue title for 8373094: javac may fail because of unattributed break in a loop

Issue

• JDK-8373094: javac may fail because of unattributed break in a loop (Bug - P3)

Reviewers

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

Reviewing

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[bridgekeeper]

👋 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]

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

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

8373094: javac may fail because of unattributed break in a loop

Reviewed-by: vromero

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At the time when this comment was updated there had been 22 new commits pushed to the master branch:

• 2596608: 8370846: Support execution of mlvm testing with test thread factory
• be8cbfa: 8362083: JDI VirtualMachine/dispose/dispose001 failed with FATAL ERROR in native method: JDWP cannot set thread local storage, jvmtiError=JVMTI_ERROR_WRONG_PHASE(112)
• f3dd8da: 8371748: Remove the (empty) ThreadPoolExecutor.finalize() method
• ... and 19 more: https://git.openjdk.org/jdk/compare/2735140147b159d3a3238804f221db4f835ef744...master

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[mlbridge]

Webrevs

• 00: Full (fd60a0f4)

[vicente-romero-oracle]

lgtm

[lahodaj]

/integrate

[openjdk]

Going to push as commit 3500150.
Since your change was applied there have been 25 commits pushed to the master branch:

• 7da9153: 8369950: TLS connection to IPv6 address fails with BCJSSE due to IllegalArgumentException
• 5f083ab: 8179918: EnumSet spliterator should report SORTED, ORDERED, NONNULL
• b0f59f6: 8373127: Update nsk/monitoring tests to support virtual thread factory testing
• ... and 22 more: https://git.openjdk.org/jdk/compare/2735140147b159d3a3238804f221db4f835ef744...master

Your commit was automatically rebased without conflicts.

[openjdk]

@lahodaj Pushed as commit 3500150.

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