bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/continuations/Cont.java

   1 package org.simantics.scl.compiler.internal.codegen.continuations;
   2
   3 import org.simantics.scl.compiler.internal.codegen.references.BoundVar;
   4 import org.simantics.scl.compiler.internal.codegen.references.Val;
   5 import org.simantics.scl.compiler.internal.codegen.references.ValRef;
   6 import org.simantics.scl.compiler.internal.codegen.ssa.SSABlock;
   7 import org.simantics.scl.compiler.internal.codegen.ssa.SSAFunction;
   8 import org.simantics.scl.compiler.internal.codegen.ssa.exits.Jump;
   9 import org.simantics.scl.compiler.internal.codegen.utils.CopyContext;
  10 import org.simantics.scl.compiler.types.TVar;
  11 import org.simantics.scl.compiler.types.Type;
  12
  13 public abstract class Cont implements ICont {
  14
  15     transient ContRef occurrence;
  16
  17     @Override
  18     public ContRef createOccurrence() {
  19         return new ContRef(this);
  20     }
  21
  22     public void replaceWith(Cont other) {
  23         ContRef cur = occurrence;
  24         if(cur != null) {
  25             while(true) {
  26                 cur.binding = other;
  27                 if(cur.next == null)
  28                     break;
  29                 else
  30                     cur = cur.next;
  31             }
  32             cur.next = other.occurrence;
  33             if(other.occurrence != null)
  34                 other.occurrence.prev = cur;
  35             other.occurrence = occurrence;
  36             occurrence = null;
  37         }
  38     }
  39
  40     public abstract int getArity();
  41     public abstract Type getParameterType(int parameterId);
  42
  43     public int occurrenceCount() {
  44         int count = 0;
  45         for(ContRef ref = occurrence;ref != null;ref=ref.next)
  46             ++count;
  47         return count;
  48     }
  49
  50     public boolean hasMoreThanOneOccurences() {
  51         return occurrence != null && occurrence.next != null;
  52     }
  53
  54     public boolean hasNoOccurences() {
  55         return occurrence == null;
  56     }
  57
  58     public abstract Cont copy(CopyContext context);
  59     public abstract void replace(TVar[] vars, Type[] replacements);
  60
  61     public ContRef getOccurrence() {
  62         return occurrence;
  63     }
  64
  65     public Cont createProxy(SSAFunction function, Val[] newParameters, Val[] oldParameters) {
  66         BoundVar[] proxyParameters = new BoundVar[oldParameters.length];
  67         for(int i=0;i<oldParameters.length;++i)
  68             proxyParameters[i] = new BoundVar(oldParameters[i].getType());
  69         SSABlock block = new SSABlock(proxyParameters);
  70         function.addBlock(block);
  71         block.setExit(new Jump(-1, createOccurrence(),
  72                 ValRef.concat(ValRef.createOccurrences(newParameters),
  73                         ValRef.createOccurrences(proxyParameters))));
  74         return block;
  75     }
  76 }