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

Simon cocoa at gmx.ch
Thu Nov 13 13:38:13 PST 2008


You could have written a custom TreeAdaptor to build the javac tree.  
Or was that simply not possible / too tedious?

On Nov 13, 2008, at 19:23 , Yang Jiang wrote:

> 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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>>
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