[antlr-interest] ANTLR-based Java grammar for javac compiler

[Yang Jiang]

That is because we are talking about two kinds of tree here.
The one build by Antlr's tree construction mechanisms is different than 
the one needed by javac.

Of course you could build an Antlr tree, but that's how far a grammar 
can go. But if you want to
take advantages of javac's code validation, code generation etc., you 
have to build a javac tree
to hook into the javac's system.

Yang

Simon wrote:
> Why do they not use the tree construction mechanisms available in  
> Antlr? As far as I can tell, they build the tree by using custom  
> actions. The link to the full grammar is shown below:
>
> http://hg.openjdk.java.net/compiler-grammar/compiler-grammar/langtools/file/e37d7d5df672/src/share/classes/com/sun/tools/javac/antlr/Java.g
>
> When would you choose not to use the tree construction mechanisms?
>
> Simon
>
> On Nov 10, 2008, at 21:45 , Terence Parr wrote:
>
>   
>> http://openjdk.java.net/projects/compiler-grammar/
>>
>> Direct link to the grammar:
>>
>> http://openjdk.java.net/projects/compiler-grammar/antlrworks/Java.g
>>
>> USF MSCS student Yang Jiang built this as an intern for Sun.
>>
>> Terence
>>
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