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1   /*
2    * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22   * or visit www.oracle.com if you need additional information or have any
23   * questions.
24   */
25  
26  package com.sun.tools.javac.code;
27  
28  import java.util.*;
29  
30  import javax.lang.model.element.ElementVisitor;
31  
32  import com.sun.tools.javac.code.Symbol.*;
33  import com.sun.tools.javac.code.Type.*;
34  import com.sun.tools.javac.jvm.*;
35  import com.sun.tools.javac.util.*;
36  import com.sun.tools.javac.util.List;
37  import static com.sun.tools.javac.code.Flags.*;
38  import static com.sun.tools.javac.jvm.ByteCodes.*;
39  import static com.sun.tools.javac.code.TypeTag.*;
40  
41  /** A class that defines all predefined constants and operators
42   *  as well as special classes such as java.lang.Object, which need
43   *  to be known to the compiler. All symbols are held in instance
44   *  fields. This makes it possible to work in multiple concurrent
45   *  projects, which might use different class files for library classes.
46   *
47   *  <p><b>This is NOT part of any supported API.
48   *  If you write code that depends on this, you do so at your own risk.
49   *  This code and its internal interfaces are subject to change or
50   *  deletion without notice.</b>
51   */
52  public class Symtab {
53      /** The context key for the symbol table. */
54      protected static final Context.Key<Symtab> symtabKey =
55          new Context.Key<Symtab>();
56  
57      /** Get the symbol table instance. */
58      public static Symtab instance(Context context) {
59          Symtab instance = context.get(symtabKey);
60          if (instance == null)
61              instance = new Symtab(context);
62          return instance;
63      }
64  
65      /** Builtin types.
66       */
67      public final JCPrimitiveType byteType = new JCPrimitiveType(BYTE, null);
68      public final JCPrimitiveType charType = new JCPrimitiveType(CHAR, null);
69      public final JCPrimitiveType shortType = new JCPrimitiveType(SHORT, null);
70      public final JCPrimitiveType intType = new JCPrimitiveType(INT, null);
71      public final JCPrimitiveType longType = new JCPrimitiveType(LONG, null);
72      public final JCPrimitiveType floatType = new JCPrimitiveType(FLOAT, null);
73      public final JCPrimitiveType doubleType = new JCPrimitiveType(DOUBLE, null);
74      public final JCPrimitiveType booleanType = new JCPrimitiveType(BOOLEAN, null);
75      public final Type botType = new BottomType();
76      public final JCVoidType voidType = new JCVoidType();
77  
78      private final Names names;
79      private final ClassReader reader;
80      private final Target target;
81  
82      /** A symbol for the root package.
83       */
84      public final PackageSymbol rootPackage;
85  
86      /** A symbol for the unnamed package.
87       */
88      public final PackageSymbol unnamedPackage;
89  
90      /** A symbol that stands for a missing symbol.
91       */
92      public final TypeSymbol noSymbol;
93  
94      /** The error symbol.
95       */
96      public final ClassSymbol errSymbol;
97  
98      /** The unknown symbol.
99       */
100     public final ClassSymbol unknownSymbol;
101 
102     /** A value for the errType, with a originalType of noType */
103     public final Type errType;
104 
105     /** A value for the unknown type. */
106     public final Type unknownType;
107 
108     /** The builtin type of all arrays. */
109     public final ClassSymbol arrayClass;
110     public final MethodSymbol arrayCloneMethod;
111 
112     /** VGJ: The (singleton) type of all bound types. */
113     public final ClassSymbol boundClass;
114 
115     /** The builtin type of all methods. */
116     public final ClassSymbol methodClass;
117 
118     /** Predefined types.
119      */
120     public final Type objectType;
121     public final Type classType;
122     public final Type classLoaderType;
123     public final Type stringType;
124     public final Type stringBufferType;
125     public final Type stringBuilderType;
126     public final Type cloneableType;
127     public final Type serializableType;
128     public final Type serializedLambdaType;
129     public final Type methodHandleType;
130     public final Type methodHandleLookupType;
131     public final Type methodTypeType;
132     public final Type nativeHeaderType;
133     public final Type throwableType;
134     public final Type errorType;
135     public final Type interruptedExceptionType;
136     public final Type illegalArgumentExceptionType;
137     public final Type exceptionType;
138     public final Type runtimeExceptionType;
139     public final Type classNotFoundExceptionType;
140     public final Type noClassDefFoundErrorType;
141     public final Type noSuchFieldErrorType;
142     public final Type assertionErrorType;
143     public final Type cloneNotSupportedExceptionType;
144     public final Type annotationType;
145     public final TypeSymbol enumSym;
146     public final Type listType;
147     public final Type collectionsType;
148     public final Type comparableType;
149     public final Type comparatorType;
150     public final Type arraysType;
151     public final Type iterableType;
152     public final Type iteratorType;
153     public final Type annotationTargetType;
154     public final Type overrideType;
155     public final Type retentionType;
156     public final Type deprecatedType;
157     public final Type suppressWarningsType;
158     public final Type inheritedType;
159     public final Type profileType;
160     public final Type proprietaryType;
161     public final Type systemType;
162     public final Type autoCloseableType;
163     public final Type trustMeType;
164     public final Type lambdaMetafactory;
165     public final Type repeatableType;
166     public final Type documentedType;
167     public final Type elementTypeType;
168     public final Type functionalInterfaceType;
169 
170     /** The symbol representing the length field of an array.
171      */
172     public final VarSymbol lengthVar;
173 
174     /** The null check operator. */
175     public final OperatorSymbol nullcheck;
176 
177     /** The symbol representing the final finalize method on enums */
178     public final MethodSymbol enumFinalFinalize;
179 
180     /** The symbol representing the close method on TWR AutoCloseable type */
181     public final MethodSymbol autoCloseableClose;
182 
183     /** The predefined type that belongs to a tag.
184      */
185     public final Type[] typeOfTag = new Type[TypeTag.getTypeTagCount()];
186 
187     /** The name of the class that belongs to a basix type tag.
188      */
189     public final Name[] boxedName = new Name[TypeTag.getTypeTagCount()];
190 
191     /** A set containing all operator names.
192      */
193     public final Set<Name> operatorNames = new HashSet<Name>();
194 
195     /** A hashtable containing the encountered top-level and member classes,
196      *  indexed by flat names. The table does not contain local classes.
197      *  It should be updated from the outside to reflect classes defined
198      *  by compiled source files.
199      */
200     public final Map<Name, ClassSymbol> classes = new HashMap<Name, ClassSymbol>();
201 
202     /** A hashtable containing the encountered packages.
203      *  the table should be updated from outside to reflect packages defined
204      *  by compiled source files.
205      */
206     public final Map<Name, PackageSymbol> packages = new HashMap<Name, PackageSymbol>();
207 
208     public void initType(Type type, ClassSymbol c) {
209         type.tsym = c;
210         typeOfTag[type.getTag().ordinal()] = type;
211     }
212 
213     public void initType(Type type, String name) {
214         initType(
215             type,
216             new ClassSymbol(
217                 PUBLIC, names.fromString(name), type, rootPackage));
218     }
219 
220     public void initType(Type type, String name, String bname) {
221         initType(type, name);
222             boxedName[type.getTag().ordinal()] = names.fromString("java.lang." + bname);
223     }
224 
225     /** The class symbol that owns all predefined symbols.
226      */
227     public final ClassSymbol predefClass;
228 
229     /** Enter a constant into symbol table.
230      *  @param name   The constant's name.
231      *  @param type   The constant's type.
232      */
233     private VarSymbol enterConstant(String name, Type type) {
234         VarSymbol c = new VarSymbol(
235             PUBLIC | STATIC | FINAL,
236             names.fromString(name),
237             type,
238             predefClass);
239         c.setData(type.constValue());
240         predefClass.members().enter(c);
241         return c;
242     }
243 
244     /** Enter a binary operation into symbol table.
245      *  @param name     The name of the operator.
246      *  @param left     The type of the left operand.
247      *  @param right    The type of the left operand.
248      *  @param res      The operation's result type.
249      *  @param opcode   The operation's bytecode instruction.
250      */
251     private void enterBinop(String name,
252                             Type left, Type right, Type res,
253                             int opcode) {
254         predefClass.members().enter(
255             new OperatorSymbol(
256                 makeOperatorName(name),
257                 new MethodType(List.of(left, right), res,
258                                List.<Type>nil(), methodClass),
259                 opcode,
260                 predefClass));
261     }
262 
263     /** Enter a binary operation, as above but with two opcodes,
264      *  which get encoded as
265      *  {@code (opcode1 << ByteCodeTags.preShift) + opcode2 }.
266      *  @param opcode1     First opcode.
267      *  @param opcode2     Second opcode.
268      */
269     private void enterBinop(String name,
270                             Type left, Type right, Type res,
271                             int opcode1, int opcode2) {
272         enterBinop(
273             name, left, right, res, (opcode1 << ByteCodes.preShift) | opcode2);
274     }
275 
276     /** Enter a unary operation into symbol table.
277      *  @param name     The name of the operator.
278      *  @param arg      The type of the operand.
279      *  @param res      The operation's result type.
280      *  @param opcode   The operation's bytecode instruction.
281      */
282     private OperatorSymbol enterUnop(String name,
283                                      Type arg,
284                                      Type res,
285                                      int opcode) {
286         OperatorSymbol sym =
287             new OperatorSymbol(makeOperatorName(name),
288                                new MethodType(List.of(arg),
289                                               res,
290                                               List.<Type>nil(),
291                                               methodClass),
292                                opcode,
293                                predefClass);
294         predefClass.members().enter(sym);
295         return sym;
296     }
297 
298     /**
299      * Create a new operator name from corresponding String representation
300      * and add the name to the set of known operator names.
301      */
302     private Name makeOperatorName(String name) {
303         Name opName = names.fromString(name);
304         operatorNames.add(opName);
305         return opName;
306     }
307 
308     /** Enter a class into symbol table.
309      *  @param s The name of the class.
310      */
311     private Type enterClass(String s) {
312         return reader.enterClass(names.fromString(s)).type;
313     }
314 
315     public void synthesizeEmptyInterfaceIfMissing(final Type type) {
316         final Completer completer = type.tsym.completer;
317         if (completer != null) {
318             type.tsym.completer = new Completer() {
319                 public void complete(Symbol sym) throws CompletionFailure {
320                     try {
321                         completer.complete(sym);
322                     } catch (CompletionFailure e) {
323                         sym.flags_field |= (PUBLIC | INTERFACE);
324                         ((ClassType) sym.type).supertype_field = objectType;
325                     }
326                 }
327             };
328         }
329     }
330 
331     public void synthesizeBoxTypeIfMissing(final Type type) {
332         ClassSymbol sym = reader.enterClass(boxedName[type.getTag().ordinal()]);
333         final Completer completer = sym.completer;
334         if (completer != null) {
335             sym.completer = new Completer() {
336                 public void complete(Symbol sym) throws CompletionFailure {
337                     try {
338                         completer.complete(sym);
339                     } catch (CompletionFailure e) {
340                         sym.flags_field |= PUBLIC;
341                         ((ClassType) sym.type).supertype_field = objectType;
342                         Name n = target.boxWithConstructors() ? names.init : names.valueOf;
343                         MethodSymbol boxMethod =
344                             new MethodSymbol(PUBLIC | STATIC,
345                                 n,
346                                 new MethodType(List.of(type), sym.type,
347                                     List.<Type>nil(), methodClass),
348                                 sym);
349                         sym.members().enter(boxMethod);
350                         MethodSymbol unboxMethod =
351                             new MethodSymbol(PUBLIC,
352                                 type.tsym.name.append(names.Value), // x.intValue()
353                                 new MethodType(List.<Type>nil(), type,
354                                     List.<Type>nil(), methodClass),
355                                 sym);
356                         sym.members().enter(unboxMethod);
357                     }
358                 }
359             };
360         }
361 
362     }
363 
364     // Enter a synthetic class that is used to mark classes in ct.sym.
365     // This class does not have a class file.
366     private Type enterSyntheticAnnotation(String name) {
367         ClassType type = (ClassType)enterClass(name);
368         ClassSymbol sym = (ClassSymbol)type.tsym;
369         sym.completer = null;
370         sym.flags_field = PUBLIC|ACYCLIC|ANNOTATION|INTERFACE;
371         sym.erasure_field = type;
372         sym.members_field = new Scope(sym);
373         type.typarams_field = List.nil();
374         type.allparams_field = List.nil();
375         type.supertype_field = annotationType;
376         type.interfaces_field = List.nil();
377         return type;
378     }
379 
380     /** Constructor; enters all predefined identifiers and operators
381      *  into symbol table.
382      */
383     protected Symtab(Context context) throws CompletionFailure {
384         context.put(symtabKey, this);
385 
386         names = Names.instance(context);
387         target = Target.instance(context);
388 
389         // Create the unknown type
390         unknownType = new UnknownType();
391 
392         // create the basic builtin symbols
393         rootPackage = new PackageSymbol(names.empty, null);
394         final JavacMessages messages = JavacMessages.instance(context);
395         unnamedPackage = new PackageSymbol(names.empty, rootPackage) {
396                 public String toString() {
397                     return messages.getLocalizedString("compiler.misc.unnamed.package");
398                 }
399             };
400         noSymbol = new TypeSymbol(Kinds.NIL, 0, names.empty, Type.noType, rootPackage) {
401             public <R, P> R accept(ElementVisitor<R, P> v, P p) {
402                 return v.visitUnknown(this, p);
403             }
404         };
405 
406         // create the error symbols
407         errSymbol = new ClassSymbol(PUBLIC|STATIC|ACYCLIC, names.any, null, rootPackage);
408         errType = new ErrorType(errSymbol, Type.noType);
409 
410         unknownSymbol = new ClassSymbol(PUBLIC|STATIC|ACYCLIC, names.fromString("<any?>"), null, rootPackage);
411         unknownSymbol.members_field = new Scope.ErrorScope(unknownSymbol);
412         unknownSymbol.type = unknownType;
413 
414         // initialize builtin types
415         initType(byteType, "byte", "Byte");
416         initType(shortType, "short", "Short");
417         initType(charType, "char", "Character");
418         initType(intType, "int", "Integer");
419         initType(longType, "long", "Long");
420         initType(floatType, "float", "Float");
421         initType(doubleType, "double", "Double");
422         initType(booleanType, "boolean", "Boolean");
423         initType(voidType, "void", "Void");
424         initType(botType, "<nulltype>");
425         initType(errType, errSymbol);
426         initType(unknownType, unknownSymbol);
427 
428         // the builtin class of all arrays
429         arrayClass = new ClassSymbol(PUBLIC|ACYCLIC, names.Array, noSymbol);
430 
431         // VGJ
432         boundClass = new ClassSymbol(PUBLIC|ACYCLIC, names.Bound, noSymbol);
433         boundClass.members_field = new Scope.ErrorScope(boundClass);
434 
435         // the builtin class of all methods
436         methodClass = new ClassSymbol(PUBLIC|ACYCLIC, names.Method, noSymbol);
437         methodClass.members_field = new Scope.ErrorScope(boundClass);
438 
439         // Create class to hold all predefined constants and operations.
440         predefClass = new ClassSymbol(PUBLIC|ACYCLIC, names.empty, rootPackage);
441         Scope scope = new Scope(predefClass);
442         predefClass.members_field = scope;
443 
444         // Enter symbols for basic types.
445         scope.enter(byteType.tsym);
446         scope.enter(shortType.tsym);
447         scope.enter(charType.tsym);
448         scope.enter(intType.tsym);
449         scope.enter(longType.tsym);
450         scope.enter(floatType.tsym);
451         scope.enter(doubleType.tsym);
452         scope.enter(booleanType.tsym);
453         scope.enter(errType.tsym);
454 
455         // Enter symbol for the errSymbol
456         scope.enter(errSymbol);
457 
458         classes.put(predefClass.fullname, predefClass);
459 
460         reader = ClassReader.instance(context);
461         reader.init(this);
462 
463         // Enter predefined classes.
464         objectType = enterClass("java.lang.Object");
465         classType = enterClass("java.lang.Class");
466         stringType = enterClass("java.lang.String");
467         stringBufferType = enterClass("java.lang.StringBuffer");
468         stringBuilderType = enterClass("java.lang.StringBuilder");
469         cloneableType = enterClass("java.lang.Cloneable");
470         throwableType = enterClass("java.lang.Throwable");
471         serializableType = enterClass("java.io.Serializable");
472         serializedLambdaType = enterClass("java.lang.invoke.SerializedLambda");
473         methodHandleType = enterClass("java.lang.invoke.MethodHandle");
474         methodHandleLookupType = enterClass("java.lang.invoke.MethodHandles$Lookup");
475         methodTypeType = enterClass("java.lang.invoke.MethodType");
476         errorType = enterClass("java.lang.Error");
477         illegalArgumentExceptionType = enterClass("java.lang.IllegalArgumentException");
478         interruptedExceptionType = enterClass("java.lang.InterruptedException");
479         exceptionType = enterClass("java.lang.Exception");
480         runtimeExceptionType = enterClass("java.lang.RuntimeException");
481         classNotFoundExceptionType = enterClass("java.lang.ClassNotFoundException");
482         noClassDefFoundErrorType = enterClass("java.lang.NoClassDefFoundError");
483         noSuchFieldErrorType = enterClass("java.lang.NoSuchFieldError");
484         assertionErrorType = enterClass("java.lang.AssertionError");
485         cloneNotSupportedExceptionType = enterClass("java.lang.CloneNotSupportedException");
486         annotationType = enterClass("java.lang.annotation.Annotation");
487         classLoaderType = enterClass("java.lang.ClassLoader");
488         enumSym = reader.enterClass(names.java_lang_Enum);
489         enumFinalFinalize =
490             new MethodSymbol(PROTECTED|FINAL|HYPOTHETICAL,
491                              names.finalize,
492                              new MethodType(List.<Type>nil(), voidType,
493                                             List.<Type>nil(), methodClass),
494                              enumSym);
495         listType = enterClass("java.util.List");
496         collectionsType = enterClass("java.util.Collections");
497         comparableType = enterClass("java.lang.Comparable");
498         comparatorType = enterClass("java.util.Comparator");
499         arraysType = enterClass("java.util.Arrays");
500         iterableType = target.hasIterable()
501             ? enterClass("java.lang.Iterable")
502             : enterClass("java.util.Collection");
503         iteratorType = enterClass("java.util.Iterator");
504         annotationTargetType = enterClass("java.lang.annotation.Target");
505         overrideType = enterClass("java.lang.Override");
506         retentionType = enterClass("java.lang.annotation.Retention");
507         deprecatedType = enterClass("java.lang.Deprecated");
508         suppressWarningsType = enterClass("java.lang.SuppressWarnings");
509         inheritedType = enterClass("java.lang.annotation.Inherited");
510         repeatableType = enterClass("java.lang.annotation.Repeatable");
511         documentedType = enterClass("java.lang.annotation.Documented");
512         elementTypeType = enterClass("java.lang.annotation.ElementType");
513         systemType = enterClass("java.lang.System");
514         autoCloseableType = enterClass("java.lang.AutoCloseable");
515         autoCloseableClose = new MethodSymbol(PUBLIC,
516                              names.close,
517                              new MethodType(List.<Type>nil(), voidType,
518                                             List.of(exceptionType), methodClass),
519                              autoCloseableType.tsym);
520         trustMeType = enterClass("java.lang.SafeVarargs");
521         nativeHeaderType = enterClass("java.lang.annotation.Native");
522         lambdaMetafactory = enterClass("java.lang.invoke.LambdaMetafactory");
523         functionalInterfaceType = enterClass("java.lang.FunctionalInterface");
524 
525         synthesizeEmptyInterfaceIfMissing(autoCloseableType);
526         synthesizeEmptyInterfaceIfMissing(cloneableType);
527         synthesizeEmptyInterfaceIfMissing(serializableType);
528         synthesizeEmptyInterfaceIfMissing(lambdaMetafactory);
529         synthesizeEmptyInterfaceIfMissing(serializedLambdaType);
530         synthesizeBoxTypeIfMissing(doubleType);
531         synthesizeBoxTypeIfMissing(floatType);
532         synthesizeBoxTypeIfMissing(voidType);
533 
534         // Enter a synthetic class that is used to mark internal
535         // proprietary classes in ct.sym.  This class does not have a
536         // class file.
537         proprietaryType = enterSyntheticAnnotation("sun.Proprietary+Annotation");
538 
539         // Enter a synthetic class that is used to provide profile info for
540         // classes in ct.sym.  This class does not have a class file.
541         profileType = enterSyntheticAnnotation("jdk.Profile+Annotation");
542         MethodSymbol m = new MethodSymbol(PUBLIC | ABSTRACT, names.value, intType, profileType.tsym);
543         profileType.tsym.members().enter(m);
544 
545         // Enter a class for arrays.
546         // The class implements java.lang.Cloneable and java.io.Serializable.
547         // It has a final length field and a clone method.
548         ClassType arrayClassType = (ClassType)arrayClass.type;
549         arrayClassType.supertype_field = objectType;
550         arrayClassType.interfaces_field = List.of(cloneableType, serializableType);
551         arrayClass.members_field = new Scope(arrayClass);
552         lengthVar = new VarSymbol(
553             PUBLIC | FINAL,
554             names.length,
555             intType,
556             arrayClass);
557         arrayClass.members().enter(lengthVar);
558         arrayCloneMethod = new MethodSymbol(
559             PUBLIC,
560             names.clone,
561             new MethodType(List.<Type>nil(), objectType,
562                            List.<Type>nil(), methodClass),
563             arrayClass);
564         arrayClass.members().enter(arrayCloneMethod);
565 
566         // Enter operators.
567         /*  Internally we use +++, --- for unary +, - to reduce +, - operators
568          *  overloading
569          */
570         enterUnop("+++", doubleType, doubleType, nop);
571         enterUnop("+++", floatType, floatType, nop);
572         enterUnop("+++", longType, longType, nop);
573         enterUnop("+++", intType, intType, nop);
574 
575         enterUnop("---", doubleType, doubleType, dneg);
576         enterUnop("---", floatType, floatType, fneg);
577         enterUnop("---", longType, longType, lneg);
578         enterUnop("---", intType, intType, ineg);
579 
580         enterUnop("~", longType, longType, lxor);
581         enterUnop("~", intType, intType, ixor);
582 
583         enterUnop("++", doubleType, doubleType, dadd);
584         enterUnop("++", floatType, floatType, fadd);
585         enterUnop("++", longType, longType, ladd);
586         enterUnop("++", intType, intType, iadd);
587         enterUnop("++", charType, charType, iadd);
588         enterUnop("++", shortType, shortType, iadd);
589         enterUnop("++", byteType, byteType, iadd);
590 
591         enterUnop("--", doubleType, doubleType, dsub);
592         enterUnop("--", floatType, floatType, fsub);
593         enterUnop("--", longType, longType, lsub);
594         enterUnop("--", intType, intType, isub);
595         enterUnop("--", charType, charType, isub);
596         enterUnop("--", shortType, shortType, isub);
597         enterUnop("--", byteType, byteType, isub);
598 
599         enterUnop("!", booleanType, booleanType, bool_not);
600         nullcheck = enterUnop("<*nullchk*>", objectType, objectType, nullchk);
601 
602         // string concatenation
603         enterBinop("+", stringType, objectType, stringType, string_add);
604         enterBinop("+", objectType, stringType, stringType, string_add);
605         enterBinop("+", stringType, stringType, stringType, string_add);
606         enterBinop("+", stringType, intType, stringType, string_add);
607         enterBinop("+", stringType, longType, stringType, string_add);
608         enterBinop("+", stringType, floatType, stringType, string_add);
609         enterBinop("+", stringType, doubleType, stringType, string_add);
610         enterBinop("+", stringType, booleanType, stringType, string_add);
611         enterBinop("+", stringType, botType, stringType, string_add);
612         enterBinop("+", intType, stringType, stringType, string_add);
613         enterBinop("+", longType, stringType, stringType, string_add);
614         enterBinop("+", floatType, stringType, stringType, string_add);
615         enterBinop("+", doubleType, stringType, stringType, string_add);
616         enterBinop("+", booleanType, stringType, stringType, string_add);
617         enterBinop("+", botType, stringType, stringType, string_add);
618 
619         // these errors would otherwise be matched as string concatenation
620         enterBinop("+", botType, botType, botType, error);
621         enterBinop("+", botType, intType, botType, error);
622         enterBinop("+", botType, longType, botType, error);
623         enterBinop("+", botType, floatType, botType, error);
624         enterBinop("+", botType, doubleType, botType, error);
625         enterBinop("+", botType, booleanType, botType, error);
626         enterBinop("+", botType, objectType, botType, error);
627         enterBinop("+", intType, botType, botType, error);
628         enterBinop("+", longType, botType, botType, error);
629         enterBinop("+", floatType, botType, botType, error);
630         enterBinop("+", doubleType, botType, botType, error);
631         enterBinop("+", booleanType, botType, botType, error);
632         enterBinop("+", objectType, botType, botType, error);
633 
634         enterBinop("+", doubleType, doubleType, doubleType, dadd);
635         enterBinop("+", floatType, floatType, floatType, fadd);
636         enterBinop("+", longType, longType, longType, ladd);
637         enterBinop("+", intType, intType, intType, iadd);
638 
639         enterBinop("-", doubleType, doubleType, doubleType, dsub);
640         enterBinop("-", floatType, floatType, floatType, fsub);
641         enterBinop("-", longType, longType, longType, lsub);
642         enterBinop("-", intType, intType, intType, isub);
643 
644         enterBinop("*", doubleType, doubleType, doubleType, dmul);
645         enterBinop("*", floatType, floatType, floatType, fmul);
646         enterBinop("*", longType, longType, longType, lmul);
647         enterBinop("*", intType, intType, intType, imul);
648 
649         enterBinop("/", doubleType, doubleType, doubleType, ddiv);
650         enterBinop("/", floatType, floatType, floatType, fdiv);
651         enterBinop("/", longType, longType, longType, ldiv);
652         enterBinop("/", intType, intType, intType, idiv);
653 
654         enterBinop("%", doubleType, doubleType, doubleType, dmod);
655         enterBinop("%", floatType, floatType, floatType, fmod);
656         enterBinop("%", longType, longType, longType, lmod);
657         enterBinop("%", intType, intType, intType, imod);
658 
659         enterBinop("&", booleanType, booleanType, booleanType, iand);
660         enterBinop("&", longType, longType, longType, land);
661         enterBinop("&", intType, intType, intType, iand);
662 
663         enterBinop("|", booleanType, booleanType, booleanType, ior);
664         enterBinop("|", longType, longType, longType, lor);
665         enterBinop("|", intType, intType, intType, ior);
666 
667         enterBinop("^", booleanType, booleanType, booleanType, ixor);
668         enterBinop("^", longType, longType, longType, lxor);
669         enterBinop("^", intType, intType, intType, ixor);
670 
671         enterBinop("<<", longType, longType, longType, lshll);
672         enterBinop("<<", intType, longType, intType, ishll);
673         enterBinop("<<", longType, intType, longType, lshl);
674         enterBinop("<<", intType, intType, intType, ishl);
675 
676         enterBinop(">>", longType, longType, longType, lshrl);
677         enterBinop(">>", intType, longType, intType, ishrl);
678         enterBinop(">>", longType, intType, longType, lshr);
679         enterBinop(">>", intType, intType, intType, ishr);
680 
681         enterBinop(">>>", longType, longType, longType, lushrl);
682         enterBinop(">>>", intType, longType, intType, iushrl);
683         enterBinop(">>>", longType, intType, longType, lushr);
684         enterBinop(">>>", intType, intType, intType, iushr);
685 
686         enterBinop("<", doubleType, doubleType, booleanType, dcmpg, iflt);
687         enterBinop("<", floatType, floatType, booleanType, fcmpg, iflt);
688         enterBinop("<", longType, longType, booleanType, lcmp, iflt);
689         enterBinop("<", intType, intType, booleanType, if_icmplt);
690 
691         enterBinop(">", doubleType, doubleType, booleanType, dcmpl, ifgt);
692         enterBinop(">", floatType, floatType, booleanType, fcmpl, ifgt);
693         enterBinop(">", longType, longType, booleanType, lcmp, ifgt);
694         enterBinop(">", intType, intType, booleanType, if_icmpgt);
695 
696         enterBinop("<=", doubleType, doubleType, booleanType, dcmpg, ifle);
697         enterBinop("<=", floatType, floatType, booleanType, fcmpg, ifle);
698         enterBinop("<=", longType, longType, booleanType, lcmp, ifle);
699         enterBinop("<=", intType, intType, booleanType, if_icmple);
700 
701         enterBinop(">=", doubleType, doubleType, booleanType, dcmpl, ifge);
702         enterBinop(">=", floatType, floatType, booleanType, fcmpl, ifge);
703         enterBinop(">=", longType, longType, booleanType, lcmp, ifge);
704         enterBinop(">=", intType, intType, booleanType, if_icmpge);
705 
706         enterBinop("==", objectType, objectType, booleanType, if_acmpeq);
707         enterBinop("==", booleanType, booleanType, booleanType, if_icmpeq);
708         enterBinop("==", doubleType, doubleType, booleanType, dcmpl, ifeq);
709         enterBinop("==", floatType, floatType, booleanType, fcmpl, ifeq);
710         enterBinop("==", longType, longType, booleanType, lcmp, ifeq);
711         enterBinop("==", intType, intType, booleanType, if_icmpeq);
712 
713         enterBinop("!=", objectType, objectType, booleanType, if_acmpne);
714         enterBinop("!=", booleanType, booleanType, booleanType, if_icmpne);
715         enterBinop("!=", doubleType, doubleType, booleanType, dcmpl, ifne);
716         enterBinop("!=", floatType, floatType, booleanType, fcmpl, ifne);
717         enterBinop("!=", longType, longType, booleanType, lcmp, ifne);
718         enterBinop("!=", intType, intType, booleanType, if_icmpne);
719 
720         enterBinop("&&", booleanType, booleanType, booleanType, bool_and);
721         enterBinop("||", booleanType, booleanType, booleanType, bool_or);
722     }
723 }