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Here are some tips on how to debug what is happening on the transition from groovy source code into the generated bytecode.

artifact | transformation | artifact
source (Foo.groovy) | - GroovyLexer -> | antlr tokens
antlr tokens | - GroovyRecognizer -> | antlr ast
antlr ast | - AntlrParserPlugin -> | groovy ast
groovy ast | - ??? -> | bytecode (Foo.class)

Example

For these examples let's assume the file 'Hello.groovy' contains

GroovyLexer (viewing Antlr Tokens)

To view the antlr tokens that the source code has been broken into you need to do the following in groovy-core subdirectory

GroovyRecognizer (viewing Antlr AST)

To view the antlr AST that the recognized tokens have built

AntlrParserPlugin (viewing Groovy AST)

To view the Groovy AST that is one step closer to the generated bytecode

Viewing Bytecode

One interesting bytecode viewer is jclasslib which renders Hello.class in this manner...

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