Fix the interface flag when re-writing a closure call to the body method #5452
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I vote for putting this into RC2.. |
retronym
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Oct 9, 2016
| INVOKESPECIAL | ||
| } | ||
| val isInterface = bodyOpcode == INVOKEINTERFACE | ||
| val isInterface = classBTypeFromInternalName(lambdaBodyHandle.getOwner).isInterface.get |
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Could we ever hit a case where we don't classBTypeFromInternalName.apply or .get fails, say if the lambda target class was not in the current compilation classpath? (Maybe a lambda had previously been inlined into the class from which we are inlining.)
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Oh, we can just call lambdaBodyHandle.isInterface here!
When re-writing a closure invocation to the body method, the `itf` flag of the invocation instruction was incorrect: it needs to be true if the method is defined in an interface (including static methdos), not if the method is invoked through `INVOKEINTERFACE`. JDK 8 doesn't flag this inconsistency and executes the bytecode, but the verifier in JDK 9 throws an `IncompatibleClassChangeError`. Similar fixes went into e619b03.
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LGTM. 👍 for 2.12.0 |
retronym
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Oct 13, 2016
We need this to close the loop on scala#5452.
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The itf flag of `visitMethodInsn` and `Handle` in ASM needs to be true when the method is defined in an interface. Java 8 ignores this but Java 9 fails at runtime with: java.lang.IncompatibleClassChangeError: Method ... must beInterfaceMethodref constant This commit is inspired by similar changes in scalac, in particular see 7d51b3f by Jason Zaugg (from scala#5251) and e619b03 by Lukas Rytz (from scala#5293). This issue was also discussed in scala#5452 (which does not matter for Dotty since we do not run the backend optimizer).
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The itf flag of `visitMethodInsn` and `Handle` in ASM needs to be true when the method is defined in an interface. Java 8 ignores this but Java 9 fails at runtime with: java.lang.IncompatibleClassChangeError: Method ... must beInterfaceMethodref constant This commit is inspired by similar changes in scalac, in particular see 7d51b3f by Jason Zaugg (from scala#5251) and e619b03 by Lukas Rytz (from scala#5293). This issue was also discussed in scala#5452 (which does not matter for Dotty since we do not run the backend optimizer).
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The itf flag of `visitMethodInsn` and `Handle` in ASM needs to be true when the method is defined in an interface. Java 8 ignores this but Java 9 fails at runtime with: java.lang.IncompatibleClassChangeError: Method ... must beInterfaceMethodref constant This commit is inspired by similar changes in scalac, in particular see 7d51b3f by Jason Zaugg (from scala#5251) and e619b03 by Lukas Rytz (from scala#5293). This issue was also discussed in scala#5452 (which does not matter for Dotty since we do not run the backend optimizer).
smarter
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The itf flag of `visitMethodInsn` and `Handle` in ASM needs to be true when the method is defined in an interface. Java 8 ignores this but Java 9 fails at runtime with: java.lang.IncompatibleClassChangeError: Method ... must beInterfaceMethodref constant This commit is inspired by similar changes in scalac, in particular see 7d51b3f by Jason Zaugg (from scala#5251) and e619b03 by Lukas Rytz (from scala#5293). This issue was also discussed in scala#5452 (which does not matter for Dotty since we do not run the backend optimizer).
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When re-writing a closure invocation to the body method, the
itfflagof the invocation instruction was incorrect: it needs to be true if
the method is defined in an interface (including static methdos), not
if the method is invoked through
INVOKEINTERFACE.JDK 8 doesn't flag this inconsistency and executes the bytecode, but the
verifier in JDK 9 throws an
IncompatibleClassChangeError.Similar fixes went into e619b03.
Fixes scala/scala-dev#242