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.CHRRuleset;
   7 import org.simantics.scl.compiler.elaboration.chr.relations.CHRConstraint;
   8 import org.simantics.scl.compiler.internal.codegen.continuations.ICont;
   9 import org.simantics.scl.compiler.internal.codegen.references.IVal;
  10 import org.simantics.scl.compiler.internal.codegen.writer.CodeWriter;
  11
  12 public class PostCommitOp extends PlanOp {
  13     int priority;
  14
  15     public PostCommitOp(long location, int priority) {
  16         super(location);
  17         this.priority = priority;
  18     }
  19
  20     @Override
  21     public void toString(StringBuilder b) {
  22         b.append("POST_COMMIT " + priority);
  23     }
  24
  25     @Override
  26     public void generateCode(CompilationContext context, PlanContext planContext, CodeWriter w) {
  27         if(planContext.currentId != null) {
  28             w.apply(location, CHRRuleset.WRITE_CURRENT_ID, planContext.contextVar, planContext.currentId);
  29             planContext.currentId = null;
  30             w.apply(location, CHRRuleset.ACTIVATE, planContext.contextVar, new IntegerConstant(priority+planContext.ruleset.initialPriorityNumber));
  31         }
  32         for(PartnerFact activeFact : planContext.partnerFacts) {
  33             if(activeFact.killAfterMatch) {
  34                 if(activeFact.nextFact == null)
  35                     w.jump(location, activeFact.finishCont);
  36                 else {
  37                     CodeWriter iterateAlive = w.createBlock(activeFact.constraint.factType);
  38                     w.jump(location, iterateAlive.getContinuation(), w.apply(location, activeFact.nextFact, activeFact.factVar));
  39                     iterateUntilLiveFactFound(iterateAlive, activeFact);
  40                 }
  41                 break;
  42             }
  43             else if(activeFact.mayBeRemoved) {
  44                 if(activeFact.nextFact == null) {
  45                     w.branchAwayUnless(location, activeFact.isAlive(location, w), activeFact.finishCont);
  46                 }
  47                 else {
  48                     CodeWriter failure = w.createBlock();
  49                     CodeWriter iterateAlive = w.createBlock(activeFact.constraint.factType);
  50                     w.branchAwayUnless(location, activeFact.isAlive(location, w), failure.getContinuation());
  51                     failure.jump(location, iterateAlive.getContinuation(), failure.apply(location, activeFact.nextFact, activeFact.factVar));
  52                     iterateUntilLiveFactFound(iterateAlive, activeFact);
  53                 }
  54             }
  55         }
  56         // PostCommit does not call nextOp
  57     }
  58
  59     private void iterateUntilLiveFactFound(CodeWriter w, PartnerFact activeFact) {
  60         ICont initialContinuation = w.getContinuation();
  61         CHRConstraint constraint = activeFact.constraint;
  62         IVal fact = w.getParameters()[0];
  63         CodeWriter dead = w.createBlock();
  64         w.branchAwayIf(location, w.apply(location, NullCheck.INSTANCE.createSpecialization(constraint.factType), fact), activeFact.finishCont);
  65         w.branchAwayUnless(location, activeFact.isAlive(location, w, fact), dead.getContinuation());
  66         w.jump(location, activeFact.continueCont, fact);
  67         dead.jump(location, initialContinuation, dead.apply(location, activeFact.nextFact, fact));
  68     }
  69
  70 }