Björn Kautler created GROOVY-12313:
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Summary: static-compilation leaks instanceof inferred type into
else-branch
Key: GROOVY-12313
URL: https://issues.apache.org/jira/browse/GROOVY-12313
Project: Groovy
Issue Type: Bug
Affects Versions: 4.0.31, 5.0.3
Reporter: Björn Kautler
With this in groovyconsole.dev
{code:java}
@groovy.transform.CompileStatic
class Foo extends Specification {
def foo() {
expect:
true
where:
[a, b] << [['a', 'b']]
}
}
{code}
you get
{code:java}
Cannot cast object '[a, b]' with class 'java.util.ArrayList' to class
'java.util.Map' due to: groovy.lang.GroovyRuntimeException: Could not find
matching constructor for: java.util.Map(String, String){code}
The AST transformed code after class generation phase for this is
{code:java}
@org.spockframework.runtime.model.DataProcessorMetadata(dataVariables =
['a', 'b'])
public java.lang.Object $spock_feature_0_0proc(java.lang.Object $spock_p0) {
java.lang.Object a = ((java.lang.Object) $spock_p0 instanceof
java.util.Map ? $spock_p0.getAt('a') : $spock_p0.getAt(0))
java.lang.Object b = ((java.lang.Object) $spock_p0 instanceof
java.util.Map ? $spock_p0.getAt('b') : $spock_p0.getAt(1))
return new java.lang.Object[]{ a , b }
} {code}
where {{$spock_p}} is given as {{{}['a', 'b']{}}}.
Without static compilation this works fine and runs the expected iterations.
With static compilation and indy switched off, the generated and then
decompiled bytecode is this:
{code:java}
@DataProcessorMetadata(
dataVariables = {"a", "b"}
)
public Object $spock_feature_0_0proc(Object $spock_p0) {
Object a = $spock_p0 instanceof Map ?
DefaultGroovyMethods.getAt((Map)ScriptBytecodeAdapter.castToType($spock_p0,
Map.class), "a") :
DefaultGroovyMethods.getAt((Map)ScriptBytecodeAdapter.castToType($spock_p0,
Map.class), 0);
Object b = $spock_p0 instanceof Map ?
DefaultGroovyMethods.getAt((Map)ScriptBytecodeAdapter.castToType($spock_p0,
Map.class), "b") :
DefaultGroovyMethods.getAt((Map)ScriptBytecodeAdapter.castToType($spock_p0,
Map.class), 1);
return new Object[]{a, b};
} {code}
So with static compilation the inferred {{Map}} type somehow leaks into the
else-branch of the ternary expression and causes this class-cast exception.
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