conditionalexpr.java

来自「JDK1.4编译器后端」· Java 代码 · 共 476 行 · 第 1/2 页

package AST;
import java.util.HashSet;import java.util.LinkedHashSet;import java.io.FileNotFoundException;import java.io.File;import java.util.*;import beaver.*;import java.util.ArrayList;import java.util.zip.*;import java.io.*;




public class ConditionalExpr extends Expr implements Cloneable {
    public void flushCache() {
        super.flushCache();
        constant_computed = false;
        constant_value = null;
        isConstant_computed = false;
        booleanOperator_computed = false;
        type_computed = false;
        type_value = null;
        else_branch_label_computed = false;
        then_branch_label_computed = false;
    }
     @SuppressWarnings({"unchecked", "cast"})  public ConditionalExpr clone() throws CloneNotSupportedException {
        ConditionalExpr node = (ConditionalExpr)super.clone();
        node.constant_computed = false;
        node.constant_value = null;
        node.isConstant_computed = false;
        node.booleanOperator_computed = false;
        node.type_computed = false;
        node.type_value = null;
        node.else_branch_label_computed = false;
        node.then_branch_label_computed = false;
        node.in$Circle(false);
        node.is$Final(false);
    return node;
    }
     @SuppressWarnings({"unchecked", "cast"})  public ConditionalExpr copy() {
      try {
          ConditionalExpr node = (ConditionalExpr)clone();
          if(children != null) node.children = (ASTNode[])children.clone();
          return node;
      } catch (CloneNotSupportedException e) {
      }
      System.err.println("Error: Could not clone node of type " + getClass().getName() + "!");
      return null;
    }
     @SuppressWarnings({"unchecked", "cast"})  public ConditionalExpr fullCopy() {
        ConditionalExpr res = (ConditionalExpr)copy();
        for(int i = 0; i < getNumChildNoTransform(); i++) {
          ASTNode node = getChildNoTransform(i);
          if(node != null) node = node.fullCopy();
          res.setChild(node, i);
        }
        return res;
    }
    // Declared in PrettyPrint.jadd at line 443


  public void toString(StringBuffer s) {
    getCondition().toString(s);
    s.append(" ? ");
    getTrueExpr().toString(s);
    s.append(" : ");
    getFalseExpr().toString(s);
  }

    // Declared in TypeCheck.jrag at line 562


  // 15.25
  public void typeCheck() {
    if(!getCondition().type().isBoolean())
      error("*** First expression must be a boolean in conditional operator");
    if(type().isUnknown() && !getTrueExpr().type().isUnknown() && !getFalseExpr().type().isUnknown()) {
      error("*** Operands in conditional operator does not match"); 
    }
  }

    // Declared in CreateBCode.jrag at line 1022


  public void createBCode(CodeGeneration gen) {
    if(type().isBoolean())
      emitBooleanCondition(gen);
    else {
      int endBranch = hostType().constantPool().newLabel();
      getCondition().emitEvalBranch(gen);
      if(getCondition().canBeTrue()) {
        gen.addLabel(then_branch_label());
        getTrueExpr().createBCode(gen);
        getTrueExpr().type().emitCastTo(gen, type());
        if(getCondition().canBeFalse()) {
          gen.changeStackDepth(-type().variableSize());
          gen.emitGoto(endBranch);
        }
      }
      if(getCondition().canBeFalse()) {
        gen.addLabel(else_branch_label());
        getFalseExpr().createBCode(gen);
        getFalseExpr().type().emitCastTo(gen, type());
      }
      gen.addLabel(endBranch);
    }
  }

    // Declared in CreateBCode.jrag at line 1088

  
  public void emitEvalBranch(CodeGeneration gen) {
    int endBranch = hostType().constantPool().newLabel();
    getCondition().emitEvalBranch(gen);
    gen.addLabel(then_branch_label());
    if(getCondition().canBeTrue()) {
      getTrueExpr().emitEvalBranch(gen);
      gen.emitGoto(true_label());
    }  
    gen.addLabel(else_branch_label());
    if(getCondition().canBeFalse()) {
      getFalseExpr().emitEvalBranch(gen);
      gen.emitGoto(true_label());
    }
  }

    // Declared in java.ast at line 3
    // Declared in java.ast line 191

    public ConditionalExpr() {
        super();


    }

    // Declared in java.ast at line 10


    // Declared in java.ast line 191
    public ConditionalExpr(Expr p0, Expr p1, Expr p2) {
        setChild(p0, 0);
        setChild(p1, 1);
        setChild(p2, 2);
    }

    // Declared in java.ast at line 16


  protected int numChildren() {
    return 3;
  }

    // Declared in java.ast at line 19

  public boolean mayHaveRewrite() { return false; }

    // Declared in java.ast at line 2
    // Declared in java.ast line 191
    public void setCondition(Expr node) {
        setChild(node, 0);
    }

    // Declared in java.ast at line 5

    public Expr getCondition() {
        return (Expr)getChild(0);
    }

    // Declared in java.ast at line 9


    public Expr getConditionNoTransform() {
        return (Expr)getChildNoTransform(0);
    }

    // Declared in java.ast at line 2
    // Declared in java.ast line 191
    public void setTrueExpr(Expr node) {
        setChild(node, 1);
    }

    // Declared in java.ast at line 5

    public Expr getTrueExpr() {
        return (Expr)getChild(1);
    }

    // Declared in java.ast at line 9


    public Expr getTrueExprNoTransform() {
        return (Expr)getChildNoTransform(1);
    }

    // Declared in java.ast at line 2
    // Declared in java.ast line 191
    public void setFalseExpr(Expr node) {
        setChild(node, 2);
    }

    // Declared in java.ast at line 5

    public Expr getFalseExpr() {
        return (Expr)getChild(2);
    }

    // Declared in java.ast at line 9


    public Expr getFalseExprNoTransform() {
        return (Expr)getChildNoTransform(2);
    }

    protected boolean constant_computed = false;
    protected Constant constant_value;
    // Declared in ConstantExpression.jrag at line 132
 @SuppressWarnings({"unchecked", "cast"})     public Constant constant() {
        if(constant_computed)
            return constant_value;
        int num = boundariesCrossed;
        boolean isFinal = this.is$Final();
        constant_value = constant_compute();
        if(isFinal && num == boundariesCrossed)
            constant_computed = true;
        return constant_value;
    }

    private Constant constant_compute() {  return type().questionColon(getCondition().constant(), getTrueExpr().constant(),getFalseExpr().constant());  }

    protected boolean isConstant_computed = false;
    protected boolean isConstant_value;
    // Declared in ConstantExpression.jrag at line 477
 @SuppressWarnings({"unchecked", "cast"})     public boolean isConstant() {
        if(isConstant_computed)
            return isConstant_value;
        int num = boundariesCrossed;
        boolean isFinal = this.is$Final();
        isConstant_value = isConstant_compute();
        if(isFinal && num == boundariesCrossed)
            isConstant_computed = true;
        return isConstant_value;
    }

    private boolean isConstant_compute() {  return getCondition().isConstant() && getTrueExpr().isConstant() && getFalseExpr().isConstant();  }