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 boolean isSafe() {
  12         if (right==null)
  13             return left.isSafe();
  14         return left.isSafe()&&right.isSafe();
  15     }
  16
  17     public Set getfunctions() {
  18         Set leftfunctions=left.getfunctions();
  19         Set rightfunctions=right.getfunctions();
  20         if (leftfunctions!=null&&rightfunctions!=null) {
  21             HashSet functions=new HashSet();
  22             functions.addAll(leftfunctions);
  23             functions.addAll(rightfunctions);
  24             return functions;
  25         }
  26         if (leftfunctions!=null)
  27             return leftfunctions;
  28         return rightfunctions;
  29     }
  30
  31     public void findmatch(Descriptor d, Set  s) {
  32         left.findmatch(d,s);
  33         if (right!=null)
  34             right.findmatch(d,s);
  35     }
  36
  37     public static boolean isInt(Expr e) {
  38         if (e==null)
  39             return false;
  40         if ((e instanceof IntegerLiteralExpr)||
  41             ((e instanceof OpExpr)&&(((OpExpr)e).opcode==Opcode.NOP)&&(((OpExpr)e).getLeftExpr() instanceof IntegerLiteralExpr)))
  42             return true;
  43         return false;
  44     }
  45
  46     public static int getInt(Expr e) {
  47         if (e instanceof IntegerLiteralExpr)
  48             return ((IntegerLiteralExpr)e).getValue();
  49         else if ((e instanceof OpExpr) && (((OpExpr)e).getLeftExpr() instanceof IntegerLiteralExpr))
  50             return ((IntegerLiteralExpr)((OpExpr)e).getLeftExpr()).getValue();
  51         else throw new Error();
  52     }
  53
  54     public OpExpr(Opcode opcode, Expr left, Expr right) {
  55         if ((isInt(left)&&isInt(right))||
  56             (isInt(left)&&(opcode==Opcode.NOT))||
  57             (isInt(left)&&(opcode==Opcode.RND))) {
  58             this.opcode=Opcode.NOP;
  59             this.right=null;
  60             int lint=isInt(left)?getInt(left):0;
  61             int rint=isInt(right)?getInt(right):0;
  62             int value=0;
  63             if (opcode==Opcode.ADD) {
  64                 value=lint+rint;
  65             } else if (opcode==Opcode.SUB) {
  66                 value=lint-rint;
  67             } else if (opcode==Opcode.SHL) {
  68                 value=lint<<rint;
  69             } else if (opcode==Opcode.SHR) {
  70                 value=lint>>rint;
  71             } else if (opcode==Opcode.MULT) {
  72                 value=lint*rint;
  73             } else if (opcode==Opcode.DIV) {
  74                 value=lint/rint;
  75             } else if (opcode==Opcode.GT) {
  76                 if (lint>rint)
  77                     value=1;
  78             } else if (opcode==Opcode.GE) {
  79                 if (lint>=rint)
  80                     value=1;
  81             } else if (opcode==Opcode.LT) {
  82                 if (lint<rint)
  83                     value=1;
  84             } else if (opcode==Opcode.LE) {
  85                 if (lint<=rint)
  86                     value=1;
  87             } else if (opcode==Opcode.EQ) {
  88                 if (lint==rint)
  89                     value=1;
  90             } else if (opcode==Opcode.NE) {
  91                 if (lint!=rint)
  92                     value=1;
  93             } else if (opcode==Opcode.AND) {
  94                 if ((lint!=0)&&(rint!=0))
  95                     value=1;
  96             } else if (opcode==Opcode.OR) {
  97                 if ((lint!=0)||(rint!=0))
  98                     value=1;
  99             } else if (opcode==Opcode.NOT) {
 100                 if (lint==0)
 101                     value=1;
 102             } else if (opcode==Opcode.RND) {
 103                 value=((lint>>3)<<3);
 104                 if ((lint % 8)!=0)
 105                     value+=8;
 106             } else throw new Error("Unrecognized Opcode");
 107             this.left=new IntegerLiteralExpr(value);
 108         } else if ((opcode==Opcode.MULT)&&
 109                    ((isInt(left)&&(getInt(left)==0))
 110                     ||(isInt(right)&&(getInt(right)==0)))) {
 111             this.opcode=Opcode.NOP;
 112             this.right=null;
 113             this.left=new IntegerLiteralExpr(0);
 114         } else {
 115             this.opcode = opcode;
 116             this.left = left;
 117             this.right = right;
 118             assert (right == null && (opcode == Opcode.NOT||opcode==Opcode.RND)) || (right != null);
 119         }
 120     }
 121
 122     public Expr getRightExpr() {
 123         return right;
 124     }
 125
 126     public Expr getLeftExpr() {
 127         return left;
 128     }
 129
 130     public Set freeVars() {
 131         Set lset=left.freeVars();
 132         Set rset=null;
 133         if (right!=null)
 134             rset=right.freeVars();
 135         if (lset==null)
 136             return rset;
 137         if (rset!=null)
 138             lset.addAll(rset);
 139         return lset;
 140     }
 141
 142     public String name() {
 143         if (opcode==Opcode.NOT)
 144             return "!("+left.name()+")";
 145         if (opcode==Opcode.NOP)
 146             return left.name();
 147         if (opcode==Opcode.RND)
 148             return "Round("+left.name()+")";
 149         String name=left.name()+opcode.toString();
 150         if (right!=null)
 151             name+=right.name();
 152         return name;
 153     }
 154
 155     public Opcode getOpcode() {
 156         return opcode;
 157     }
 158
 159
 160
 161
 162     public boolean equals(Map remap, Expr e) {
 163         if (e==null||!(e instanceof OpExpr))
 164             return false;
 165         OpExpr oe=(OpExpr)e;
 166         if (opcode!=oe.opcode)
 167             return false;
 168         if (!left.equals(remap,oe.left))
 169             return false;
 170         if ((opcode!=Opcode.NOT)&&(opcode!=Opcode.RND)&&(opcode!=Opcode.NOP))
 171             if (!right.equals(remap,oe.right))
 172                 return false;
 173         return true;
 174     }
 175
 176     public DNFRule constructDNF() {
 177         if (opcode==Opcode.AND) {
 178             DNFRule leftd=left.constructDNF();
 179             DNFRule rightd=right.constructDNF();
 180             return leftd.and(rightd);
 181         } else if (opcode==Opcode.OR) {
 182             DNFRule leftd=left.constructDNF();
 183             DNFRule rightd=right.constructDNF();
 184             return leftd.or(rightd);
 185         } else if (opcode==Opcode.NOT) {
 186             DNFRule leftd=left.constructDNF();
 187             return leftd.not();
 188         } else return new DNFRule(this);
 189     }
 190
 191     public boolean usesDescriptor(Descriptor d) {
 192         return left.usesDescriptor(d)||(right!=null&&right.usesDescriptor(d));
 193     }
 194
 195     public Set useDescriptor(Descriptor d) {
 196         HashSet newset=new HashSet();
 197         newset.addAll(left.useDescriptor(d));
 198         if (right!=null)
 199             newset.addAll(right.useDescriptor(d));
 200         return newset;
 201     }
 202
 203     public int[] getRepairs(boolean negated, Termination t) {
 204         if (left instanceof RelationExpr)
 205             return new int[] {AbstractRepair.MODIFYRELATION};
 206         if (left instanceof SizeofExpr) {
 207             Opcode op=opcode;
 208             if (negated) {
 209                 /* remove negation through opcode translation */
 210                 if (op==Opcode.GT)
 211                     op=Opcode.LE;
 212                 else if (op==Opcode.GE)
 213                     op=Opcode.LT;
 214                 else if (op==Opcode.EQ)
 215                     op=Opcode.NE;
 216                 else if (op==Opcode.NE)
 217                     op=Opcode.EQ;
 218                 else if (op==Opcode.LT)
 219                     op=Opcode.GE;
 220                 else if (op==Opcode.LE)
 221                     op=Opcode.GT;
 222             }
 223
 224             int maxsize=t.maxsize.getsize(getDescriptor());
 225             int size=getInt(right);
 226
 227
 228             boolean isRelation=((SizeofExpr)left).setexpr instanceof ImageSetExpr;
 229             if (isRelation) {
 230                 if (op==Opcode.EQ) {
 231                     if (size==0)
 232                         return new int[] {AbstractRepair.REMOVEFROMRELATION};
 233                     else {
 234                         if ((maxsize!=-1)&&maxsize<=size)
 235                             return new int[] {AbstractRepair.ADDTORELATION};
 236                         return new int[] {AbstractRepair.ADDTORELATION,
 237                                           AbstractRepair.REMOVEFROMRELATION};
 238                     }
 239                 } else if (op==Opcode.GE||op==Opcode.GT) {
 240                     return new int[]{AbstractRepair.ADDTORELATION};
 241                 } else if (op==Opcode.LE||op==Opcode.LT) {
 242                     if ((op==Opcode.LT&&maxsize!=-1&&maxsize<size)||(op==Opcode.LE&&maxsize!=-1&&maxsize<=size))
 243                         return new int[0];
 244                     return new int[]{AbstractRepair.REMOVEFROMRELATION};
 245                 } else if (op==Opcode.NE) {
 246                     if (maxsize<size&&maxsize!=-1)
 247                         return new int[0];
 248                     return new int[]{AbstractRepair.ADDTORELATION};
 249                 } else throw new Error();
 250             } else {
 251                 if (op==Opcode.EQ) {
 252                     if (size==0)
 253                         return new int[] {AbstractRepair.REMOVEFROMSET};
 254                     else {
 255                         if (maxsize<=size&&maxsize!=-1)
 256                             return new int[] {AbstractRepair.ADDTOSET};
 257                         return new int[] {AbstractRepair.ADDTOSET,
 258                                               AbstractRepair.REMOVEFROMSET};
 259                     }
 260                 } else if (op==Opcode.GE||op==Opcode.GT) {
 261                     return new int[] {AbstractRepair.ADDTOSET};
 262                 } else if (op==Opcode.LE||op==Opcode.LT) {
 263                     if ((op==Opcode.LT&&maxsize<size&&maxsize!=-1)||(op==Opcode.LE&&maxsize<=size&&maxsize!=-1))
 264                         return new int[0];
 265                     return new int[] {AbstractRepair.REMOVEFROMSET};
 266                 } else if (op==Opcode.NE) {
 267                     if (maxsize<size&&maxsize!=-1)
 268                         return new int[0];
 269                     return new int[] {AbstractRepair.ADDTOSET};
 270                 } else throw new Error();
 271             }
 272         }
 273         throw new Error("BAD");
 274     }
 275
 276     public Descriptor getDescriptor() {
 277         return left.getDescriptor();
 278     }
 279
 280     public boolean inverted() {
 281         return left.inverted();
 282     }
 283
 284     public Set getInversedRelations() {
 285         Set set = left.getInversedRelations();
 286         if (right != null) {
 287             set.addAll(right.getInversedRelations());
 288         }
 289         return set;
 290     }
 291
 292     public Set getRequiredDescriptors() {
 293         Set v = left.getRequiredDescriptors();
 294
 295         if (right != null) {
 296             v.addAll(right.getRequiredDescriptors());
 297         }
 298
 299         return v;
 300     }
 301
 302     public void generate(CodeWriter writer, VarDescriptor dest) {
 303         VarDescriptor ld = VarDescriptor.makeNew("leftop");
 304         left.generate(writer, ld);
 305         VarDescriptor rd = null;
 306         VarDescriptor lm=VarDescriptor.makeNew("lm");
 307         VarDescriptor rm=VarDescriptor.makeNew("rm");
 308
 309         if (right != null) {
 310             if ((opcode==Opcode.OR)||
 311                 (opcode==Opcode.AND)) {
 312                 writer.outputline("int "+lm.getSafeSymbol()+"=maybe;");
 313                 writer.outputline("int maybe=0;");
 314             }
 315
 316             rd = VarDescriptor.makeNew("rightop");
 317             right.generate(writer, rd);
 318         }
 319
 320         String code;
 321         if (opcode == Opcode.RND) {
 322             writer.outputline("int " +dest.getSafeSymbol() + " = (" +
 323                               ld.getSafeSymbol() + ">>3)<<3; ");
 324             writer.outputline("if ("+ld.getSafeSymbol()+" % 8) "+dest.getSafeSymbol()+"+=8;");
 325         } else if (opcode == Opcode.NOP) {
 326             writer.outputline("int " +dest.getSafeSymbol() + " = " +
 327                               ld.getSafeSymbol() +"; ");
 328         } else if (opcode == Opcode.AND) {
 329             writer.outputline("int "+rm.getSafeSymbol()+"=maybe;");
 330             writer.outputline("maybe = (" + ld.getSafeSymbol() + " && " + rm.getSafeSymbol() + ") || (" + rd.getSafeSymbol() + " && " + lm.getSafeSymbol() + ") || (" + lm.getSafeSymbol() + " && " + rm.getSafeSymbol() + ");");
 331             writer.outputline(dest.getSafeSymbol() + " = " + ld.getSafeSymbol() + " && " + rd.getSafeSymbol() + ";");
 332         } else if (opcode == Opcode.OR) {
 333             writer.outputline("int "+rm.getSafeSymbol()+"=maybe;");
 334             writer.outputline("maybe = (!" + ld.getSafeSymbol() + " && " + rm.getSafeSymbol() + ") || (!" + rd.getSafeSymbol() +
 335                               " && " + lm.getSafeSymbol() + ") || (" + lm.getSafeSymbol() + " && " + rm.getSafeSymbol() + ");");
 336             writer.outputline(dest.getSafeSymbol() + " = " + ld.getSafeSymbol() + " || " + rd.getSafeSymbol() +
 337                               ";");
 338         } else if (opcode != Opcode.NOT) { /* two operands */
 339             assert rd != null;
 340             writer.outputline("int " + dest.getSafeSymbol() + " = " +
 341                               ld.getSafeSymbol() + " " + opcode.toString() + " " + rd.getSafeSymbol() + ";");
 342         } else if (opcode == Opcode.NOT) {
 343             writer.outputline("int " + dest.getSafeSymbol() + " = !" + ld.getSafeSymbol() + ";");
 344         }
 345     }
 346
 347     public void prettyPrint(PrettyPrinter pp) {
 348         pp.output("(");
 349         if (opcode == Opcode.NOT) {
 350             pp.output("!");
 351             left.prettyPrint(pp);
 352         } else if (opcode == Opcode.NOP) {
 353             left.prettyPrint(pp);
 354         } else if (opcode == Opcode.RND) {
 355             pp.output("RND ");
 356             left.prettyPrint(pp);
 357         } else {
 358             left.prettyPrint(pp);
 359             pp.output(" " + opcode.toString() + " ");
 360             assert right != null;
 361             right.prettyPrint(pp);
 362         }
 363         pp.output(")");
 364     }
 365
 366     public TypeDescriptor typecheck(SemanticAnalyzer sa) {
 367         TypeDescriptor lt = left.typecheck(sa);
 368         TypeDescriptor rt = right == null ? null : right.typecheck(sa);
 369
 370         if (lt == null) {
 371             return null;
 372         } else if (right != null && rt == null) {
 373             return null;
 374         }
 375
 376         boolean ok = true;
 377
 378         // #ATTN#: if we want node.next != literal(0) to represent a null check than we need to allow ptr arithmetic
 379         // either that or we use a isvalid clause to check for null
 380
 381         /*
 382         if (lt != ReservedTypeDescriptor.INT) {
 383             sa.getErrorReporter().report(null, "Left hand side of expression is of type '" + lt.getSymbol() + "' but must be type 'int'");
 384             ok = false;
 385         }
 386
 387         if (right != null) {
 388             if (rt != ReservedTypeDescriptor.INT) {
 389                 sa.getErrorReporter().report(null, "Right hand side of expression is of type '" + rt.getSymbol() + "' but must be type 'int'");
 390                 ok = false;
 391             }
 392         }
 393         */
 394
 395         if (!ok) {
 396             return null;
 397         }
 398
 399         this.td = ReservedTypeDescriptor.INT;
 400         return this.td;
 401     }
 402
 403 }