Lyuben Atanasov created GROOVY-9807:
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Summary: Static compile of dynamically generated code produces
different output in a top-level class and a nested class
Key: GROOVY-9807
URL: https://issues.apache.org/jira/browse/GROOVY-9807
Project: Groovy
Issue Type: Bug
Components: Static compilation
Affects Versions: 3.0.6
Environment: openjdk version "1.8.0_242"
OpenJDK Runtime Environment (build 1.8.0_242-8u242-b08-0ubuntu3~18.04-b08)
OpenJDK 64-Bit Server VM (build 25.242-b08, mixed mode)
Reporter: Lyuben Atanasov
I have encountered an issue when trying to generate code, containing chained
method calls, at runtime (without source code) and compiling using
CompileStatic.
What I am trying to achieve is produce code similar to:
{code:java}
public StringBuilder test()
{
StringBuilder sb = new StringBuilder().append("testString");
return sb;
}
{code}
I create the appropriate AST nodes, statements, expressions, etc.
Everything works fine if I add a method like the one shown in a top-level class
(the class is also dynamically generated at runtime). However, if I try to add
the exact same method to a nested class, it seems like the groovy compiler gets
somehow confused and, judging by the decompiler output, produces something like:
{code:java}
public StringBuilder test()
{
final StringBuilder sb = ((StringBuilder) ((Closure)
this).getThisObject()).append("testString");
return sb;
}
{code}
Naturally, this does not work.
Here's how I try to generate the method:
{code:java}
ClassNode topLevelClass =
ClassHelper.make("com.example.groovycompiler.test.TopLevelClass");
InnerClassNode nestedClass = new InnerClassNode(topLevelClass,
"com.example.groovycompiler.test.TopLevelClass$NestedClass", Opcodes.ACC_PUBLIC
| Opcodes.ACC_STATIC, ClassHelper.OBJECT_TYPE);
ClassNode stringBuilderClass = ClassHelper.make(StringBuilder.class);
nestedClass.addMethod("test", Opcodes.ACC_PUBLIC, stringBuilderClass,
Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, block(
declS(varX("sb", stringBuilderClass),
callX(ctorX(stringBuilderClass), "append", args(constX("testString")))),
returnS(varX("sb", stringBuilderClass))
));
{code}
Perhaps I am missing something, in which case I will be very happy to receive
some pointers.
I have created a github repo with a maven project containing a unit test that
demonstrates the issue:
https://github.com/l-atanasov/groovy-static-compile-issue
Note, that I have extended the CompilationUnit a little to allow to run the
static compiler without source.
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