bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/top/ExpressionInterpretationContext.java

   1 package org.simantics.scl.compiler.top;
   2
   3 import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;
   4 import org.simantics.scl.compiler.elaboration.expressions.Variable;
   5 import org.simantics.scl.compiler.internal.codegen.utils.TransientClassBuilder;
   6 import org.simantics.scl.compiler.runtime.RuntimeEnvironment;
   7
   8 import gnu.trove.impl.Constants;
   9 import gnu.trove.map.hash.TObjectIntHashMap;
  10
  11
  12 public class ExpressionInterpretationContext {
  13
  14     public final RuntimeEnvironment runtimeEnvironment;
  15     public final TransientClassBuilder localClassBuilder;
  16     private int curVariableId = 0;
  17     private int maxVariableId = 0;
  18     private final TObjectIntHashMap<Variable> variableIds =
  19             new TObjectIntHashMap<Variable>(
  20                     Constants.DEFAULT_CAPACITY,
  21                     Constants.DEFAULT_LOAD_FACTOR,
  22                     -1);
  23
  24     public ExpressionInterpretationContext(
  25             RuntimeEnvironment runtimeEnvironment,
  26             TransientClassBuilder localClassBuilder) {
  27         this.runtimeEnvironment = runtimeEnvironment;
  28         this.localClassBuilder = localClassBuilder;
  29     }
  30
  31     public int push(Variable var) {
  32         int id = curVariableId++;
  33         variableIds.put(var, id);
  34         maxVariableId = Math.max(maxVariableId, curVariableId);
  35         return id;
  36     }
  37
  38     public void pop(Variable var) {
  39         int id = variableIds.remove(var);
  40         --curVariableId;
  41         if(id != curVariableId)
  42             throw new IllegalStateException("Variable pushs and pops don't match.");
  43     }
  44
  45     public int getVariableId(Variable var) {
  46         int id = variableIds.get(var);
  47         if(id < 0)
  48             throw new InternalCompilerError("Encontered bug while interpreting exception: variable " + var + " was not bounded.");
  49         return id;
  50     }
  51
  52     public ExpressionInterpretationContext createNewContext() {
  53         return new ExpressionInterpretationContext(runtimeEnvironment, localClassBuilder);
  54     }
  55
  56     public int getMaxVariableId() {
  57         return maxVariableId;
  58     }
  59 }