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author | Lukas Rytz <lukas.rytz@gmail.com> | 2015-06-30 14:12:43 +0200 |
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committer | Adriaan Moors <adriaan.moors@typesafe.com> | 2015-07-01 11:44:49 -0700 |
commit | 373db1ed700b0098ccf0c8a6d68c34d836765344 (patch) | |
tree | a1ae6b94e2e605bc7e9db92f2a051b0c24c26f00 /src/build/bnd | |
parent | 43e115e120b151259e47de1878fdbe0d400f75b5 (diff) | |
download | scala-373db1ed700b0098ccf0c8a6d68c34d836765344.tar.gz scala-373db1ed700b0098ccf0c8a6d68c34d836765344.tar.bz2 scala-373db1ed700b0098ccf0c8a6d68c34d836765344.zip |
Java parser: default methods in interfaces are not `DEFERRED`
The Java parser should not set the `DEFERRED` flag for
default methods or static methods in interfaces.
Their bytecode doesn't have it either.
Also tightens parsing of Java abstract methods to
disallow a method body.
Here's the log of how Lukas diagnosed this:
```
quick.bin:
...
BUILD FAILED
/Users/luc/scala/scala/build.xml:69: The following error occurred while executing this line:
...
/Users/luc/scala/scala/build-ant-macros.xml:350: Could not create type mk-bin due to
java.lang.BootstrapMethodError: call site initialization exception
at java.lang.invoke.CallSite.makeSite(CallSite.java:341)
at java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:307)
at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:297)
at scala.sys.BooleanProp$.keyExists(BooleanProp.scala:72)
at scala.sys.SystemProperties$.bool(SystemProperties.scala:78)
at scala.sys.SystemProperties$.noTraceSupression$lzycompute(SystemProperties.scala:89)
at scala.sys.SystemProperties$.noTraceSupression(SystemProperties.scala:89)
at scala.util.control.NoStackTrace$.<init>(NoStackTrace.scala:31)
at scala.util.control.NoStackTrace$.<clinit>(NoStackTrace.scala)
at scala.util.control.NoStackTrace$class.fillInStackTrace(NoStackTrace.scala:22)
at scala.util.control.BreakControl.fillInStackTrace(Breaks.scala:94)
at java.lang.Throwable.<init>(Throwable.java:250)
at scala.util.control.BreakControl.<init>(Breaks.scala:94)
at scala.util.control.Breaks.<init>(Breaks.scala:29)
at scala.collection.Traversable$.<init>(Traversable.scala:95)
at scala.collection.Traversable$.<clinit>(Traversable.scala)
at scala.package$.<init>(package.scala:40)
at scala.package$.<clinit>(package.scala)
at scala.Predef$.<init>(Predef.scala:89)
at scala.Predef$.<clinit>(Predef.scala)
at scala.tools.ant.ScalaTool.<init>(ScalaTool.scala:58)
[...]
Caused by: java.lang.invoke.LambdaConversionException:
Incorrect number of parameters for static method invokeStatic
scala.sys.BooleanProp$.scala$sys$BooleanProp$$$anonfun$2$adapted:(String)Object;
0 captured parameters, 0 functional interface method parameters, 1 implementation parameters
at java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:193)
at java.lang.invoke.LambdaMetafactory.altMetafactory(LambdaMetafactory.java:473)
at java.lang.invoke.CallSite.makeSite(CallSite.java:325)
```
[source code](https://github.com/scala/scala/blob/2.11.x/src/library/scala/sys/BooleanProp.scala#L72):
```
s => s == "" || s.equalsIgnoreCase("true")
```
bytecode:
```
INVOKEDYNAMIC $init$()Lscala/compat/java8/JFunction1; [
// handle kind 0x6 : INVOKESTATIC
java/lang/invoke/LambdaMetafactory.altMetafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;[Ljava/lang/Object;)Ljava/lang/invoke/CallSite;
// arguments:
()V,
// handle kind 0x6 : INVOKESTATIC
scala/sys/BooleanProp$.scala$sys$BooleanProp$$$anonfun$2$adapted(Ljava/lang/String;)Ljava/lang/Object;,
(Ljava/lang/String;)Ljava/lang/Object;,
3,
1,
Lscala/Serializable;.class,
0
]
CHECKCAST scala/Function1
```
The mistake seems to be that the Scala compiler incorrectly selects `$init$`
([which is a default method](https://github.com/scala/scala/blob/640ffe7fceb5d573b2c12a7c7da09bfd751036a0/src/library/scala/compat/java8/JFunction1.java#L10))
as the abstract method of `JFunction1`, whereas it should be `apply` (inherited from `Function1`).
Since we're doing mixed compilation, this is almost certainly a problem of the Java parser.
Diffstat (limited to 'src/build/bnd')
0 files changed, 0 insertions, 0 deletions