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https://issues.apache.org/jira/browse/GROOVY-9086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820283#comment-16820283
]
Eric Milles edited comment on GROOVY-9086 at 4/17/19 4:40 PM:
--------------------------------------------------------------
Also, the "owner" qualifier does not seem to work right for nested closures
under {{@CompileStatic}}.
{code:groovy}
class C1 {
void m() {
print 'outer delegate'
}
}
class C2 {
void m() {
print 'inner delegate'
}
}
void outer(@DelegatesTo(value = C1) Closure block) {
block.delegate = new C1()
block()
}
void inner(@DelegatesTo(value = C2) Closure block) {
block.delegate = new C2()
block()
}
@groovy.transform.CompileStatic // comment out and script prints "outer
delegate" as expected
void test() {
outer {
inner {
owner.m() // "Cannot find matching method Script#m(). Please check if the
declared type is right and if the method exists."
// replace "owner" with "delegate" and CompileStatic has no error and
prints "inner delegate" as expected
}
}
}
test()
{code}
was (Author: emilles):
Also, the "owner" qualifier does not seem to work right for nested closures
under {{@CompileStatic}}.
{code:groovy}
class C1 {
void m() {
print 'outer delegate'
}
}
class C2 {
void m() {
print 'inner delegate'
}
}
void outer(@DelegatesTo(value = C1, strategy = Closure.OWNER_FIRST) Closure
block) {
block.delegate = new C1()
block()
}
void inner(@DelegatesTo(value = C2, strategy = Closure.OWNER_FIRST) Closure
block) {
block.delegate = new C2()
block()
}
@groovy.transform.CompileStatic // comment out and script prints "outer
delegate" as expected
void test() {
outer {
inner {
owner.m() // "Cannot find matching method Script#m(). Please check if the
declared type is right and if the method exists."
// replace "owner" with "delegate" and CompileStatic has no error and
prints "inner delegate" as expected
}
}
}
test()
{code}
> @CompileStatic of closure calls with OWNER_FIRST fail at runtime with
> ClassCastException
> ----------------------------------------------------------------------------------------
>
> Key: GROOVY-9086
> URL: https://issues.apache.org/jira/browse/GROOVY-9086
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation
> Affects Versions: 2.5.6
> Environment: WIndows7, Groovy 2.5.6, Java 8 + 11
> Reporter: Andreas Turban
> Priority: Major
> Attachments: TestScript.groovy
>
>
> The attached script fails with a ClassCastException, when method m2 is
> annotated with
>
> {code:java}
> strategy = Closure.OWNER_FIRST
> {code}
> but work with
>
> {code:java}
> strategy = Closure.DELEGATE_FIRST
> {code}
> The expected system-out should be
>
> {code:java}
> c1Method called{code}
> in both cases. The generated bytecode for closure
> Test$_test_closure1$_closure2.class contains a call to getDelegate() instead
> of getOwner() in case of Closure.OWNER_FIRST. But correctly generates code
> getOwner() in case of Closure.DELEGATE_FIRST.
> The resulting ClassCastException at runtime is:
> {code:java}
> java.lang.ClassCastException: Test$C2 cannot be cast to groovy.lang.Closure
> at Test$_test_closure1$_closure2.doCall(TestScript.groovy:28)
> at Test$_test_closure1$_closure2.doCall(TestScript.groovy)
> at Test.m2(TestScript.groovy:20)
> at Test$_test_closure1.doCall(TestScript.groovy:26)
> at Test$_test_closure1.doCall(TestScript.groovy)
> at Test.m1(TestScript.groovy:8)
> at Test.test(TestScript.groovy:25)
> at Test$test.call(Unknown Source)
> at TestScript.run(TestScript.groovy:42)
> {code}
> The wrong bytecode for case Closure.OWNER_FIRST:
> {code:java}
> public java.lang.Object doCall(java.lang.Object);
> descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
> flags: ACC_PUBLIC
> Code:
> stack=1, locals=2, args_size=2
> 0: aload_0
> 1: checkcast #2 // class Test$_test_closure1$_closure2
> 4: invokevirtual #29 // Method getDelegate:()Ljava/lang/Object;
> 7: checkcast #4 // class groovy/lang/Closure
> 10: invokevirtual #30 // Method
> groovy/lang/Closure.getDelegate:()Ljava/lang/Object;
> 13: checkcast #32 // class Test$C1
> 16: invokevirtual #36 // Method Test$C1.c1Method:()V
> 19: aconst_null
> 20: areturn
> {code}
> The correct bytecode for case Closure.DELEGATE_FIRST:
> {code:java}
> public java.lang.Object doCall(java.lang.Object);
> descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
> flags: ACC_PUBLIC
> Code:
> stack=1, locals=2, args_size=2
> 0: aload_0
> 1: checkcast #2 // class Test$_test_closure1$_closure2
> 4: invokevirtual #29 // Method getOwner:()Ljava/lang/Object;
> 7: checkcast #4 // class groovy/lang/Closure
> 10: invokevirtual #32 // Method
> groovy/lang/Closure.getDelegate:()Ljava/lang/Object;
> 13: checkcast #34 // class Test$C1
> 16: invokevirtual #38 // Method Test$C1.c1Method:()V
> 19: aconst_null
> 20: areturn
> {code}
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