Repair/RepairCompiler/MCC/IR/OpExpr.java

   1 package MCC.IR;
   2
   3 import java.util.*;
   4
   5 public class OpExpr extends Expr {
   6
   7     Expr left;
   8     Expr right;
   9     Opcode opcode;
  10
  11     public void findmatch(Descriptor d, Set  s) {
  12         left.findmatch(d,s);
  13         if (right!=null)
  14             right.findmatch(d,s);
  15     }
  16
  17     public static boolean isInt(Expr e) {
  18         if ((e instanceof IntegerLiteralExpr)||
  19             ((e instanceof OpExpr)&&(((OpExpr)e).getLeftExpr() instanceof IntegerLiteralExpr)))
  20             return true;
  21         return false;
  22     }
  23
  24     public static int getInt(Expr e) {
  25         if (e instanceof IntegerLiteralExpr)
  26             return ((IntegerLiteralExpr)e).getValue();
  27         else if ((e instanceof OpExpr) && (((OpExpr)e).getLeftExpr() instanceof IntegerLiteralExpr))
  28             return ((IntegerLiteralExpr)((OpExpr)e).getLeftExpr()).getValue();
  29         else throw new Error();
  30     }
  31
  32     public OpExpr(Opcode opcode, Expr left, Expr right) {
  33         if ((isInt(left)&&isInt(right))||
  34             (isInt(left)&&(opcode==Opcode.NOT))||
  35             (isInt(left)&&(opcode==Opcode.RND))) {
  36             this.opcode=Opcode.NOP;
  37             this.right=null;
  38             int lint=getInt(left);
  39             int rint=getInt(right);
  40             int value=0;
  41             if (opcode==Opcode.ADD) {
  42                 value=lint+rint;
  43             } else if (opcode==Opcode.SUB) {
  44                 value=lint-rint;
  45             } else if (opcode==Opcode.SHL) {
  46                 value=lint<<rint;
  47             } else if (opcode==Opcode.SHR) {
  48                 value=lint>>rint;
  49             } else if (opcode==Opcode.MULT) {
  50                 value=lint*rint;
  51             } else if (opcode==Opcode.DIV) {
  52                 value=lint/rint;
  53             } else if (opcode==Opcode.GT) {
  54                 if (lint>rint)
  55                     value=1;
  56             } else if (opcode==Opcode.GE) {
  57                 if (lint>=rint)
  58                     value=1;
  59             } else if (opcode==Opcode.LT) {
  60                 if (lint<rint)
  61                     value=1;
  62             } else if (opcode==Opcode.LE) {
  63                 if (lint<=rint)
  64                     value=1;
  65             } else if (opcode==Opcode.EQ) {
  66                 if (lint==rint)
  67                     value=1;
  68             } else if (opcode==Opcode.NE) {
  69                 if (lint!=rint)
  70                     value=1;
  71             } else if (opcode==Opcode.AND) {
  72                 if ((lint!=0)&&(rint!=0))
  73                     value=1;
  74             } else if (opcode==Opcode.OR) {
  75                 if ((lint!=0)||(rint!=0))
  76                     value=1;
  77             } else if (opcode==Opcode.NOT) {
  78                 if (lint==0)
  79                     value=1;
  80             } else if (opcode==Opcode.RND) {
  81                 value=((lint>>3)<<3);
  82                 if ((lint % 8)!=0)
  83                     value+=8;
  84             } else throw new Error("Unrecognized Opcode");
  85             this.left=new IntegerLiteralExpr(value);
  86             } else {
  87             this.opcode = opcode;
  88             this.left = left;
  89             this.right = right;
  90             assert (right == null && (opcode == Opcode.NOT||opcode==Opcode.RND)) || (right != null);
  91         }
  92     }
  93
  94     public Expr getRightExpr() {
  95         return right;
  96     }
  97
  98     public Expr getLeftExpr() {
  99         return left;
 100     }
 101
 102     public Set freeVars() {
 103         Set lset=left.freeVars();
 104         Set rset=null;
 105         if (right!=null)
 106             rset=right.freeVars();
 107         if (lset==null)
 108             return rset;
 109         if (rset!=null)
 110             lset.addAll(rset);
 111         return lset;
 112     }
 113
 114     public String name() {
 115         if (opcode==Opcode.NOT)
 116             return "!("+left.name()+")";
 117         if (opcode==Opcode.NOP)
 118             return left.name();
 119         if (opcode==Opcode.RND)
 120             return "Round("+left.name()+")";
 121         String name=left.name()+opcode.toString();
 122         if (right!=null)
 123             name+=right.name();
 124         return name;
 125     }
 126
 127     public Opcode getOpcode() {
 128         return opcode;
 129     }
 130
 131
 132
 133
 134     public boolean equals(Map remap, Expr e) {
 135         if (e==null||!(e instanceof OpExpr))
 136             return false;
 137         OpExpr oe=(OpExpr)e;
 138         if (opcode!=oe.opcode)
 139             return false;
 140         if (!left.equals(remap,oe.left))
 141             return false;
 142         if ((opcode!=Opcode.NOT)&&(opcode!=Opcode.RND)&&(opcode!=Opcode.NOP))
 143             if (!right.equals(remap,oe.right))
 144                 return false;
 145         return true;
 146     }
 147
 148     public DNFRule constructDNF() {
 149         if (opcode==Opcode.AND) {
 150             DNFRule leftd=left.constructDNF();
 151             DNFRule rightd=right.constructDNF();
 152             return leftd.and(rightd);
 153         } else if (opcode==Opcode.OR) {
 154             DNFRule leftd=left.constructDNF();
 155             DNFRule rightd=right.constructDNF();
 156             return leftd.or(rightd);
 157         } else if (opcode==Opcode.NOT) {
 158             DNFRule leftd=left.constructDNF();
 159             return leftd.not();
 160         } else return new DNFRule(this);
 161     }
 162
 163     public boolean usesDescriptor(Descriptor d) {
 164         if (opcode==Opcode.GT||opcode==Opcode.GE||opcode==Opcode.LT||
 165             opcode==Opcode.LE||opcode==Opcode.EQ||opcode==Opcode.NE)
 166             return left.usesDescriptor(d)||(right!=null&&right.usesDescriptor(d));
 167             //      return right.usesDescriptor(d);
 168         else
 169             return left.usesDescriptor(d)||(right!=null&&right.usesDescriptor(d));
 170     }
 171
 172
 173     public int[] getRepairs(boolean negated) {
 174         if (left instanceof RelationExpr)
 175             return new int[] {AbstractRepair.MODIFYRELATION};
 176         if (left instanceof SizeofExpr) {
 177             Opcode op=opcode;
 178             if (negated) {
 179                 /* remove negation through opcode translation */
 180                 if (op==Opcode.GT)
 181                     op=Opcode.LE;
 182                 else if (op==Opcode.GE)
 183                     op=Opcode.LT;
 184                 else if (op==Opcode.EQ)
 185                     op=Opcode.NE;
 186                 else if (op==Opcode.NE)
 187                     op=Opcode.EQ;
 188                 else if (op==Opcode.LT)
 189                     op=Opcode.GE;
 190                 else if (op==Opcode.LE)
 191                     op=Opcode.GT;
 192             }
 193
 194
 195
 196             boolean isRelation=((SizeofExpr)left).setexpr instanceof ImageSetExpr;
 197             if (isRelation) {
 198                 if (op==Opcode.EQ) {
 199                     if (((IntegerLiteralExpr)right).getValue()==0)
 200                         return new int[] {AbstractRepair.REMOVEFROMRELATION};
 201                     else
 202                         return new int[] {AbstractRepair.ADDTORELATION,
 203                                           AbstractRepair.REMOVEFROMRELATION};
 204                 } else if (op==Opcode.GE||op==Opcode.GT) {
 205                     return new int[]{AbstractRepair.ADDTORELATION};
 206                 } else if (op==Opcode.LE||op==Opcode.LT) {
 207                     return new int[]{AbstractRepair.REMOVEFROMRELATION};
 208                 } else if (op==Opcode.NE) {
 209                     return new int[]{AbstractRepair.ADDTORELATION};
 210                 } else throw new Error();
 211             } else {
 212                 if (op==Opcode.EQ) {
 213                     if (((IntegerLiteralExpr)right).getValue()==0)
 214                         return new int[] {AbstractRepair.REMOVEFROMSET};
 215                     else
 216                         return new int[] {AbstractRepair.ADDTOSET,
 217                                               AbstractRepair.REMOVEFROMSET};
 218                 } else if (op==Opcode.GE||op==Opcode.GT) {
 219                     return new int[] {AbstractRepair.ADDTOSET};
 220                 } else if (op==Opcode.LE||op==Opcode.LT) {
 221                     return new int[] {AbstractRepair.REMOVEFROMSET};
 222                 } else if (op==Opcode.NE) {
 223                     return new int[] {AbstractRepair.ADDTOSET};
 224                 } else throw new Error();
 225             }
 226         }
 227         throw new Error("BAD");
 228     }
 229
 230     public Descriptor getDescriptor() {
 231         return left.getDescriptor();
 232     }
 233
 234     public boolean inverted() {
 235         return left.inverted();
 236     }
 237
 238     public Set getInversedRelations() {
 239         Set set = left.getInversedRelations();
 240         if (right != null) {
 241             set.addAll(right.getInversedRelations());
 242         }
 243         return set;
 244     }
 245
 246     public Set getRequiredDescriptors() {
 247         Set v = left.getRequiredDescriptors();
 248
 249         if (right != null) {
 250             v.addAll(right.getRequiredDescriptors());
 251         }
 252
 253         return v;
 254     }
 255
 256     public void generate(CodeWriter writer, VarDescriptor dest) {
 257         VarDescriptor ld = VarDescriptor.makeNew("leftop");
 258         left.generate(writer, ld);
 259         VarDescriptor rd = null;
 260         VarDescriptor lm=VarDescriptor.makeNew("lm");
 261         VarDescriptor rm=VarDescriptor.makeNew("rm");
 262
 263         if (right != null) {
 264             if ((opcode==Opcode.OR)||
 265                 (opcode==Opcode.AND)) {
 266                 writer.outputline("int "+lm.getSafeSymbol()+"=maybe;");
 267                 writer.outputline("int maybe=0;");
 268             }
 269
 270             rd = VarDescriptor.makeNew("rightop");
 271             right.generate(writer, rd);
 272         }
 273
 274         String code;
 275         if (opcode == Opcode.RND) {
 276             writer.outputline("int " +dest.getSafeSymbol() + " = (" +
 277                               ld.getSafeSymbol() + ">>3)<<3; ");
 278             writer.outputline("if ("+ld.getSafeSymbol()+" % 8) "+dest.getSafeSymbol()+"+=8;");
 279         } else if (opcode == Opcode.NOP) {
 280             writer.outputline("int " +dest.getSafeSymbol() + " = " +
 281                               ld.getSafeSymbol() +"; ");
 282         } else if (opcode != Opcode.NOT) { /* two operands */
 283             assert rd != null;
 284             writer.outputline("int " + dest.getSafeSymbol() + " = " +
 285                               ld.getSafeSymbol() + " " + opcode.toString() + " " + rd.getSafeSymbol() + ";");
 286         } else if (opcode == Opcode.AND) {
 287             writer.outputline("int "+rm.getSafeSymbol()+"=maybe;");
 288             writer.outputline("maybe = (" + ld.getSafeSymbol() + " && " + rm.getSafeSymbol() + ") || (" + rd.getSafeSymbol() + " && " + lm.getSafeSymbol() + ") || (" + lm.getSafeSymbol() + " && " + rm.getSafeSymbol() + ");");
 289             writer.outputline(dest.getSafeSymbol() + " = " + ld.getSafeSymbol() + " && " + rd.getSafeSymbol() + ";");
 290         } else if (opcode == Opcode.OR) {
 291             writer.outputline("int "+rm.getSafeSymbol()+"=maybe;");
 292             writer.outputline("maybe = (!" + ld.getSafeSymbol() + " && " + rm.getSafeSymbol() + ") || (!" + rd.getSafeSymbol() +
 293                               " && " + lm.getSafeSymbol() + ") || (" + lm.getSafeSymbol() + " && " + rm.getSafeSymbol() + ");");
 294             writer.outputline(dest.getSafeSymbol() + " = " + ld.getSafeSymbol() + " || " + rd.getSafeSymbol() +
 295                               ";");
 296         } else {
 297             writer.outputline("int " + dest.getSafeSymbol() + " = !" + ld.getSafeSymbol() + ";");
 298         }
 299     }
 300
 301     public void prettyPrint(PrettyPrinter pp) {
 302         pp.output("(");
 303         if (opcode == Opcode.NOT) {
 304             pp.output("!");
 305             left.prettyPrint(pp);
 306         } else if (opcode == Opcode.NOP) {
 307             left.prettyPrint(pp);
 308         } else if (opcode == Opcode.RND) {
 309             pp.output("RND ");
 310             left.prettyPrint(pp);
 311         } else {
 312             left.prettyPrint(pp);
 313             pp.output(" " + opcode.toString() + " ");
 314             assert right != null;
 315             right.prettyPrint(pp);
 316         }
 317         pp.output(")");
 318     }
 319
 320     public TypeDescriptor typecheck(SemanticAnalyzer sa) {
 321         TypeDescriptor lt = left.typecheck(sa);
 322         TypeDescriptor rt = right == null ? null : right.typecheck(sa);
 323
 324         if (lt == null) {
 325             return null;
 326         } else if (right != null && rt == null) {
 327             return null;
 328         }
 329
 330         boolean ok = true;
 331
 332         // #ATTN#: if we want node.next != literal(0) to represent a null check than we need to allow ptr arithmetic
 333         // either that or we use a isvalid clause to check for null
 334
 335         /*
 336         if (lt != ReservedTypeDescriptor.INT) {
 337             sa.getErrorReporter().report(null, "Left hand side of expression is of type '" + lt.getSymbol() + "' but must be type 'int'");
 338             ok = false;
 339         }
 340
 341         if (right != null) {
 342             if (rt != ReservedTypeDescriptor.INT) {
 343                 sa.getErrorReporter().report(null, "Right hand side of expression is of type '" + rt.getSymbol() + "' but must be type 'int'");
 344                 ok = false;
 345             }
 346         }
 347         */
 348
 349         if (!ok) {
 350             return null;
 351         }
 352
 353         this.td = ReservedTypeDescriptor.INT;
 354         return this.td;
 355     }
 356
 357 }
 358
 359
 360
 361
 362