getelementptr.java

来自「一种将c高级语言转化给VHDL的编译器」· Java 代码 · 共 123 行

/*
 *
 LA-CC 05-135 Trident 0.7.1

Copyright Notice
Copyright 2006 (c) the Regents of the University of California.

This Software was produced under a U.S. Government contract
(W-7405-ENG-36) by Los Alamos National Laboratory, which is operated
by the University of California for the U.S. Department of Energy. The
U.S. Government is licensed to use, reproduce, and distribute this
Software. Permission is granted to the public to copy and use this
Software without charge, provided that this Notice and any statement
of authorship are reproduced on all copies. Neither the Government nor
the University makes any warranty, express or implied, or assumes any
liability or responsibility for the user of this Software.


 */


package fp.flowgraph;

import java.util.*;

import fp.util.BooleanEquation;

public class Getelementptr extends InstructionFormat {

  public static boolean conforms(Instruction i) {
    return conforms(i.operator);
  }

  public static boolean conforms(Operator op) {
    return op.format == Getelementptr_format;
  }
  
  // handle Results
  public static Operand getResult(Instruction i) {
    return i.getOperand(0);
  }

  public static Operand getArrayVar(Instruction i) {
    return i.getOperand(1);
  }
 
 public static void setResult(Instruction i, Operand result) {
    i.putOperand(0, result);
  }

  // is this necessary?
  public static int indexOfResult(Instruction i) { return 0; }

  public static boolean hasResult(Instruction i) {
    return i.getOperand(0) != null;
  }


  public static TypeOperand getValType(Instruction i, int index) {
    return (TypeOperand)(i.getOperand(2*index+2));
  }

  public static Operand getValOperand(Instruction i, int index) {
    return i.getOperand(2*(index + 1) + 1);
  }

  public static void setVal(Instruction i, int index, Type type, Operand value) {
    i.putOperand(2*index + 2, new TypeOperand(type));
    i.putOperand(2*(index + 1) + 1, value);
  }

  public static boolean hasVal(Instruction i, int index) {
    return i.getOperand(2*(index+1)+ 1) != null;
  }

  public static Instruction create(Operator o, Operand result, Type type, Operand ptr,
				   LinkedList values) {
    return Getelementptr.create(o, result, type, ptr, values, null);
  }

  public static Instruction create(Operator o, Operand result, Type type, Operand ptr,
                                   LinkedList values, BooleanEquation eq) {
    Instruction i = new Instruction(o, type, eq);
    i.putOperand(0, result);
    i.putOperand(1, ptr);
    if (values != null) {
      i.resizeNumberOfOperands( values.size() + 5 );
      
      int index = 0;
      
      for(ListIterator iter = values.listIterator(); iter.hasNext(); ) {
	TypeOperand typeOp = (TypeOperand)iter.next();
	Operand value = (Operand)iter.next();
	i.putOperand(2*index + 2, typeOp);
	i.putOperand(2*(index + 1) + 1, value );
	index++;
      }
    }
    return i;
  }

  public static void verify(Instruction i) throws IllegalOperand {
    if (!hasResult(i)) {
      throw new IllegalOperand("Getelementptr instruction does not have a result operand.");
    }
    // check for ptr here too

    int index = 0;
    while (hasVal(i, index)) {
      Operand value = getValOperand(i, index);
      TypeOperand typeOp = getValType(i, index);
      if ((typeOp==null) || (value==null)) {
	throw new IllegalOperand("Getelementptr instruction missing operand in its type/value pairs");
      }
      if (!value.isFirstClassOperand()) {
	throw new IllegalOperand("Getelementptr instruction value operand " + value.getName() + " is not first class operand.");
      }
      index++;
    }
  }
											  
}