bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/plan/PostCommitOp.java

   1 package org.simantics.scl.compiler.elaboration.chr.plan;
   2
   3 import org.simantics.scl.compiler.compilation.CompilationContext;
   4 import org.simantics.scl.compiler.constants.IntegerConstant;
   5 import org.simantics.scl.compiler.constants.singletons.NullCheck;
   6 import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint;
   7 import org.simantics.scl.compiler.internal.codegen.continuations.ICont;
   8 import org.simantics.scl.compiler.internal.codegen.references.IVal;
   9 import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
  10
  11 public class PostCommitOp extends PlanOp {
  12     int priority;
  13
  14     public PostCommitOp(long location, int priority) {
  15         super(location);
  16         this.priority = priority;
  17     }
  18
  19     @Override
  20     public void toString(StringBuilder b) {
  21         b.append("POST_COMMIT " + priority);
  22     }
  23
  24     @Override
  25     public void generateCode(CompilationContext context, PlanContext planContext, CodeWriter w) {
  26         if(planContext.currentId != null) {
  27             w.apply(location, planContext.ruleset.writeCurrentId, planContext.storeVar, planContext.currentId);
  28             planContext.currentId = null;
  29             w.apply(location, planContext.ruleset.activateProcedure, planContext.storeVar, new IntegerConstant(priority));
  30         }
  31         for(PartnerFact activeFact : planContext.partnerFacts) {
  32             if(activeFact.killAfterMatch) {
  33                 if(activeFact.nextFact == null)
  34                     w.jump(activeFact.finishCont);
  35                 else {
  36                     CodeWriter iterateAlive = w.createBlock(activeFact.constraint.factType);
  37                     w.jump(iterateAlive.getContinuation(), w.apply(location, activeFact.nextFact, activeFact.factVar));
  38                     iterateUntilLiveFactFound(iterateAlive, activeFact);
  39                 }
  40                 break;
  41             }
  42             else if(activeFact.mayBeRemoved) {
  43                 if(activeFact.nextFact == null) {
  44                     w.branchAwayUnless(activeFact.isAlive(location, w), activeFact.finishCont);
  45                 }
  46                 else {
  47                     CodeWriter failure = w.createBlock();
  48                     CodeWriter iterateAlive = w.createBlock(activeFact.constraint.factType);
  49                     w.branchAwayUnless(activeFact.isAlive(location, w), failure.getContinuation());
  50                     failure.jump(iterateAlive.getContinuation(), failure.apply(location, activeFact.nextFact, activeFact.factVar));
  51                     iterateUntilLiveFactFound(iterateAlive, activeFact);
  52                 }
  53             }
  54         }
  55         // PostCommit does not call nextOp
  56     }
  57
  58     private void iterateUntilLiveFactFound(CodeWriter w, PartnerFact activeFact) {
  59         ICont initialContinuation = w.getContinuation();
  60         CHRConstraint constraint = activeFact.constraint;
  61         IVal fact = w.getParameters()[0];
  62         CodeWriter dead = w.createBlock();
  63         w.branchAwayIf(w.apply(location, NullCheck.INSTANCE.createSpecialization(constraint.factType), fact), activeFact.finishCont);
  64         w.branchAwayUnless(activeFact.isAlive(location, w, fact), dead.getContinuation());
  65         w.jump(activeFact.continueCont, fact);
  66         dead.jump(initialContinuation, dead.apply(location, activeFact.nextFact, fact));
  67     }
  68
  69 }