[tree-ssa] Gimplifying Java

Tue Jun 17 09:18:00 GMT 2003

Ranjit Mathew writes:
 > > Following is my first attempt to merge the gcj source frontend with the
 > > tree-ssa infrastructure.
 > 
 > A few dumb questions from a person quite new to tree-ssa:
 > 
 > a. The subject confuses me - should it not be
 > "Genericizing Java"? I mean, aren't front-ends supposed
 > to generate GENERIC trees that a common "gimplifier"
 > will convert to GIMPLE?
Java (or at least the source compiler) uses GENERIC trees already, so
there is not need for an additional conversion pass. Java also uses a
few extra nodes of its own, which need special treatment.
 > b. After the tree-ssa branch is merged into mainline
 > (in 3.5?), would we have a single tree representation
 > produced by all front-ends rather than the current
 > dialects produced by C/C++ and Java?
Yup.
 > c. Are we doing away with the current tree + RTL dichotomy
 > of Intermediate Representations and going with a
 > single IR after this effort is complete?
Nope. We still need RTL for code generation -- gimple can't represent
machine instructions.
Andrew.