[ragel-users] Re: Ruby and Java code generation

[Adrian Thurston]

Hi,

What is now needed in Ruby and Java code is a jump back into the
processing loop just like that found at rlgen-cd/tabcodegen.cpp:1041.

-Adrian

Adrian Thurston wrote:
> Before loop breaks and variables were used in Ruby code call/cc features
> were used. This was found to be very slow (about 10 times slower than
> the current). Do you think throw/catch would be any better than call/cc?
> 
> Later today I'm going to commit my work on the C version. I'll highlight
> the part that is troublesome and maybe someone that knows Java and Ruby
> well can suggest something.
> 
> Adrian
> 
> Ryan King wrote:
>> On Sep 28, 2007, at 12:02 PM, Adrian Thurston wrote:
>>> Hi,
>>>
>>> I'm having some trouble with Ruby and Java code generation as I
>>> implement 6.0 features. The main problem with targeting both of these
>>> languages is the lack of goto statement. This is problematic even for
>>> the table-driven machine. There are a number of places in the driver
>>> where a jump in or jump out of the processing loop is required. So far
>>> I've gotten away with using named loops in Java and control flow
>>> variables in Ruby, however with the latest changes things are getting
>>> really ugly. I don't have a solution yet. I'm not sure what to do  
>>> right
>>> now, so for the time being I will continue ahead with the 6.0 features
>>> and stall work on Ruby and Java code generation.
>> You can emulate GOTO-ish behavior in ruby with throw and catch:
>>
>>
>> catch(:foo) do
>>   ...
>>   throw(:foo)
>>   ...
>> end
>>
>> There are limits to how the code can be structured in these cases (in  
>> blocks).
>>
>> -ryan
>>
>> --~--~---------~--~----~------------~-------~--~----~
>> You received this message because you are subscribed to the Google Groups "ragel-users" group.
>> To post to this group, send email to ragel-users at googlegroups.com
>> To unsubscribe from this group, send email to ragel-users-unsubscribe at googlegroups.com
>> For more options, visit this group at http://groups.google.com/group/ragel-users?hl=en
>> -~----------~----~----~----~------~----~------~--~---
>>
>>
> 

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 252 bytes
Desc: OpenPGP digital signature
URL: <http://www.colm.net/pipermail/ragel-users/attachments/20070928/62d1aa9d/attachment-0001.sig>