Java Code Examples for com.sun.tools.javac.code.Symbol.MethodSymbol#flags()

private void addMethodIfExist(DocEnv env, ClassSymbol def, String methodName) {
    Names names = def.name.table.names;

    for (Scope.Entry e = def.members().lookup(names.fromString(methodName)); e.scope != null; e = e.next()) {
        if (e.sym.kind == Kinds.MTH) {
            MethodSymbol md = (MethodSymbol)e.sym;
            if ((md.flags() & Flags.STATIC) == 0) {
                /*
                 * WARNING: not robust if unqualifiedMethodName is overloaded
                 *          method. Signature checking could make more robust.
                 * READOBJECT takes a single parameter, java.io.ObjectInputStream.
                 * WRITEOBJECT takes a single parameter, java.io.ObjectOutputStream.
                 */
                methods.append(env.getMethodDoc(md));
            }
        }
    }
}
 

private void addMethodIfExist(DocEnv env, ClassSymbol def, String methodName) {
    Names names = def.name.table.names;

    for (Scope.Entry e = def.members().lookup(names.fromString(methodName)); e.scope != null; e = e.next()) {
        if (e.sym.kind == Kinds.MTH) {
            MethodSymbol md = (MethodSymbol)e.sym;
            if ((md.flags() & Flags.STATIC) == 0) {
                /*
                 * WARNING: not robust if unqualifiedMethodName is overloaded
                 *          method. Signature checking could make more robust.
                 * READOBJECT takes a single parameter, java.io.ObjectInputStream.
                 * WRITEOBJECT takes a single parameter, java.io.ObjectOutputStream.
                 */
                methods.append(env.getMethodDoc(md));
            }
        }
    }
}
 

private void addMethodIfExist(DocEnv env, ClassSymbol def, String methodName) {
    Names names = def.name.table.names;

    for (Scope.Entry e = def.members().lookup(names.fromString(methodName)); e.scope != null; e = e.next()) {
        if (e.sym.kind == Kinds.MTH) {
            MethodSymbol md = (MethodSymbol)e.sym;
            if ((md.flags() & Flags.STATIC) == 0) {
                /*
                 * WARNING: not robust if unqualifiedMethodName is overloaded
                 *          method. Signature checking could make more robust.
                 * READOBJECT takes a single parameter, java.io.ObjectInputStream.
                 * WRITEOBJECT takes a single parameter, java.io.ObjectOutputStream.
                 */
                methods.append(env.getMethodDoc(md));
            }
        }
    }
}
 

private void addMethodIfExist(DocEnv env, ClassSymbol def, String methodName) {
    Names names = def.name.table.names;

    for (Scope.Entry e = def.members().lookup(names.fromString(methodName)); e.scope != null; e = e.next()) {
        if (e.sym.kind == Kinds.MTH) {
            MethodSymbol md = (MethodSymbol)e.sym;
            if ((md.flags() & Flags.STATIC) == 0) {
                /*
                 * WARNING: not robust if unqualifiedMethodName is overloaded
                 *          method. Signature checking could make more robust.
                 * READOBJECT takes a single parameter, java.io.ObjectInputStream.
                 * WRITEOBJECT takes a single parameter, java.io.ObjectOutputStream.
                 */
                methods.append(env.getMethodDoc(md));
            }
        }
    }
}
 

private void addMethodIfExist(DocEnv env, ClassSymbol def, String methodName) {
    Names names = def.name.table.names;

    for (Scope.Entry e = def.members().lookup(names.fromString(methodName)); e.scope != null; e = e.next()) {
        if (e.sym.kind == Kinds.MTH) {
            MethodSymbol md = (MethodSymbol)e.sym;
            if ((md.flags() & Flags.STATIC) == 0) {
                /*
                 * WARNING: not robust if unqualifiedMethodName is overloaded
                 *          method. Signature checking could make more robust.
                 * READOBJECT takes a single parameter, java.io.ObjectInputStream.
                 * WRITEOBJECT takes a single parameter, java.io.ObjectOutputStream.
                 */
                methods.append(env.getMethodDoc(md));
            }
        }
    }
}
 

private void addMethodIfExist(DocEnv env, ClassSymbol def, String methodName) {
    Names names = def.name.table.names;

    for (Symbol sym : def.members().getSymbolsByName(names.fromString(methodName))) {
        if (sym.kind == MTH) {
            MethodSymbol md = (MethodSymbol)sym;
            if ((md.flags() & Flags.STATIC) == 0) {
                /*
                 * WARNING: not robust if unqualifiedMethodName is overloaded
                 *          method. Signature checking could make more robust.
                 * READOBJECT takes a single parameter, java.io.ObjectInputStream.
                 * WRITEOBJECT takes a single parameter, java.io.ObjectOutputStream.
                 */
                methods.append(env.getMethodDoc(md));
            }
        }
    }
}
 

private void addMethodIfExist(DocEnv env, ClassSymbol def, String methodName) {
    Names names = def.name.table.names;

    for (Scope.Entry e = def.members().lookup(names.fromString(methodName)); e.scope != null; e = e.next()) {
        if (e.sym.kind == Kinds.MTH) {
            MethodSymbol md = (MethodSymbol)e.sym;
            if ((md.flags() & Flags.STATIC) == 0) {
                /*
                 * WARNING: not robust if unqualifiedMethodName is overloaded
                 *          method. Signature checking could make more robust.
                 * READOBJECT takes a single parameter, java.io.ObjectInputStream.
                 * WRITEOBJECT takes a single parameter, java.io.ObjectOutputStream.
                 */
                methods.append(env.getMethodDoc(md));
            }
        }
    }
}
 

/**
    * Returns true if this element represents a method which overrides a
    * method in one of its superclasses.
    */
   public boolean overridesMethod(ExecutableElement element) {
       MethodSymbol m = (MethodSymbol)element;
       if ((m.flags() & Flags.STATIC) == 0) {
           ClassSymbol owner = (ClassSymbol) m.owner;
           for (Type sup = jctypes.supertype(m.owner.type);
                   sup.hasTag(TypeTag.CLASS);
                   sup = jctypes.supertype(sup)) {
               for (Symbol sym : sup.tsym.members().getSymbolsByName(m.name)) {
                   if (m.overrides(sym, owner, jctypes, true)) 
                       return true;
               }
           }
       }
return false;
   }
 

/** Check whether this member should be documented. */
public boolean shouldDocument(MethodSymbol sym) {
    long mod = sym.flags();

    if ((mod & Flags.SYNTHETIC) != 0) {
        return false;
    }

    return showAccess.checkModifier(translateModifiers(mod));
}
 

public Extension getExtension(final JavacNode typeNode, final ClassType extensionMethodProviderType) {
	List<MethodSymbol> extensionMethods = new ArrayList<MethodSymbol>();
	TypeSymbol tsym = extensionMethodProviderType.asElement();
	if (tsym != null) for (Symbol member : tsym.getEnclosedElements()) {
		if (member.getKind() != ElementKind.METHOD) continue;
		MethodSymbol method = (MethodSymbol) member;
		if ((method.flags() & (STATIC | PUBLIC)) == 0) continue;
		if (method.params().isEmpty()) continue;
		extensionMethods.add(method);
	}
	return new Extension(extensionMethods, tsym);
}
 

MethodSymbol factoryMethod(ClassSymbol tsym) {
    for (Symbol sym : tsym.members().getSymbolsByName(names.provider, sym -> sym.kind == MTH)) {
        MethodSymbol mSym = (MethodSymbol)sym;
        if (mSym.isStatic() && (mSym.flags() & Flags.PUBLIC) != 0 && mSym.params().isEmpty()) {
            return mSym;
        }
    }
    return null;
}
 

public Element getImplementationOf(ExecutableElement method, TypeElement origin) {
    MethodSymbol msym = (MethodSymbol)method;
    MethodSymbol implmethod = (msym).implementation((TypeSymbol)origin, jctypes, true);
    if ((msym.flags() & Flags.STATIC) != 0) {
        // return null if outside of hierarchy, or the method itself if origin extends method's class
        if (jctypes.isSubtype(((TypeSymbol)origin).type,  ((TypeSymbol)((MethodSymbol)method).owner).type)) {
            return method;
        } else {
            return null;
        }
    }
    if (implmethod == null || implmethod == method) {
        //look for default implementations
        if (allowDefaultMethods) {
            com.sun.tools.javac.util.List<MethodSymbol> candidates = jctypes.interfaceCandidates(((TypeSymbol) origin).type, (MethodSymbol) method);
            X: for (com.sun.tools.javac.util.List<MethodSymbol> ptr = candidates; ptr.head != null; ptr = ptr.tail) {
                MethodSymbol prov = ptr.head;
                if (prov != null && prov.overrides((MethodSymbol) method, (TypeSymbol) origin, jctypes, true) &&
                    hasImplementation(prov)) {
                    // PENDING: even if `prov' overrides the method, there may be a different method, in different interface, that overrides `method'
                    // 'prov' must override all such compatible methods in order to present a valid implementation of `method'.
                    for (com.sun.tools.javac.util.List<MethodSymbol> sibling = candidates; sibling.head != null; sibling = sibling.tail) {
                        MethodSymbol redeclare = sibling.head;

                        // if the default method does not override the alternative candidate from an interface, then the default will be rejected
                        // as specified in JLS #8, par. 8.4.8
                        if (!prov.overrides(redeclare, (TypeSymbol)origin, jctypes, allowDefaultMethods)) {
                            break X;
                        }
                    }
                    implmethod = prov;
                    break;
                }
            }
        }
    }
    return implmethod;
}
 

MethodSymbol factoryMethod(ClassSymbol tsym) {
    for (Symbol sym : tsym.members().getSymbolsByName(names.provider, sym -> sym.kind == MTH)) {
        MethodSymbol mSym = (MethodSymbol)sym;
        if (mSym.isStatic() && (mSym.flags() & Flags.PUBLIC) != 0 && mSym.params().isEmpty()) {
            return mSym;
        }
    }
    return null;
}
 

void checkDefaultMethodClashes(DiagnosticPosition pos, Type site) {
    DefaultMethodClashFilter dcf = new DefaultMethodClashFilter(site);
    for (Symbol m : types.membersClosure(site, false).getSymbols(dcf)) {
        Assert.check(m.kind == MTH);
        List<MethodSymbol> prov = types.interfaceCandidates(site, (MethodSymbol)m);
        if (prov.size() > 1) {
            ListBuffer<Symbol> abstracts = new ListBuffer<>();
            ListBuffer<Symbol> defaults = new ListBuffer<>();
            for (MethodSymbol provSym : prov) {
                if ((provSym.flags() & DEFAULT) != 0) {
                    defaults = defaults.append(provSym);
                } else if ((provSym.flags() & ABSTRACT) != 0) {
                    abstracts = abstracts.append(provSym);
                }
                if (defaults.nonEmpty() && defaults.size() + abstracts.size() >= 2) {
                    //strong semantics - issue an error if two sibling interfaces
                    //have two override-equivalent defaults - or if one is abstract
                    //and the other is default
                    String errKey;
                    Symbol s1 = defaults.first();
                    Symbol s2;
                    if (defaults.size() > 1) {
                        errKey = "types.incompatible.unrelated.defaults";
                        s2 = defaults.toList().tail.head;
                    } else {
                        errKey = "types.incompatible.abstract.default";
                        s2 = abstracts.first();
                    }
                    log.error(pos, errKey,
                            Kinds.kindName(site.tsym), site,
                            m.name, types.memberType(site, m).getParameterTypes(),
                            s1.location(), s2.location());
                    break;
                }
            }
        }
    }
}
 

/** Check that all abstract members of given class have definitions.
 *  @param pos          Position to be used for error reporting.
 *  @param c            The class.
 */
void checkAllDefined(DiagnosticPosition pos, ClassSymbol c) {
    MethodSymbol undef = types.firstUnimplementedAbstract(c);
    if (undef != null) {
        MethodSymbol undef1 =
            new MethodSymbol(undef.flags(), undef.name,
                             types.memberType(c.type, undef), undef.owner);
        log.error(pos,
                  Errors.DoesNotOverrideAbstract(c, undef1, undef1.location()));
    }
}
 

private static boolean hasImplementation(MethodSymbol msym) {
    long f = msym.flags();
    return ((f & Flags.DEFAULT) != 0) || ((f & Flags.ABSTRACT) == 0);
}
 

@Override
public void visitProvides(JCProvides tree) {
    Type st = attr.attribType(tree.serviceName, env, syms.objectType);
    ClassSymbol service = (ClassSymbol) st.tsym;
    if (allProvides.containsKey(service)) {
        log.error(tree.serviceName.pos(), Errors.RepeatedProvidesForService(service));
    }
    ListBuffer<ClassSymbol> impls = new ListBuffer<>();
    for (JCExpression implName : tree.implNames) {
        Type it;
        boolean prevVisitingServiceImplementation = env.info.visitingServiceImplementation;
        try {
            env.info.visitingServiceImplementation = true;
            it = attr.attribType(implName, env, syms.objectType);
        } finally {
            env.info.visitingServiceImplementation = prevVisitingServiceImplementation;
        }
        ClassSymbol impl = (ClassSymbol) it.tsym;
        if ((impl.flags_field & PUBLIC) == 0) {
            log.error(implName.pos(), Errors.NotDefPublic(impl, impl.location()));
        }
        //find provider factory:
        MethodSymbol factory = factoryMethod(impl);
        if (factory != null) {
            Type returnType = factory.type.getReturnType();
            if (!types.isSubtype(returnType, st)) {
                log.error(implName.pos(), Errors.ServiceImplementationProviderReturnMustBeSubtypeOfServiceInterface);
            }
        } else {
            if (!types.isSubtype(it, st)) {
                log.error(implName.pos(), Errors.ServiceImplementationMustBeSubtypeOfServiceInterface);
            } else if ((impl.flags() & ABSTRACT) != 0) {
                log.error(implName.pos(), Errors.ServiceImplementationIsAbstract(impl));
            } else if (impl.isInner()) {
                log.error(implName.pos(), Errors.ServiceImplementationIsInner(impl));
            } else {
                MethodSymbol constr = noArgsConstructor(impl);
                if (constr == null) {
                    log.error(implName.pos(), Errors.ServiceImplementationDoesntHaveANoArgsConstructor(impl));
                } else if ((constr.flags() & PUBLIC) == 0) {
                    log.error(implName.pos(), Errors.ServiceImplementationNoArgsConstructorNotPublic(impl));
                }
            }
        }
        if (it.hasTag(CLASS)) {
            if (Maps.computeIfAbsent(allProvides,service, s -> new HashSet<>()).add(impl)) {
                impls.append(impl);
            } else {
                log.error(implName.pos(), Errors.DuplicateProvides(service, impl));
            }
        }
    }
    if (st.hasTag(CLASS) && !impls.isEmpty()) {
        Directive.ProvidesDirective d = new Directive.ProvidesDirective(service, impls.toList());
        msym.provides = msym.provides.prepend(d);
        msym.directives = msym.directives.prepend(d);
        directiveToTreeMap.put(d, tree);
    }
}
 

/**
  * Report warnings for potentially ambiguous method declarations. Two declarations
  * are potentially ambiguous if they feature two unrelated functional interface
  * in same argument position (in which case, a call site passing an implicit
  * lambda would be ambiguous).
  */
void checkPotentiallyAmbiguousOverloads(DiagnosticPosition pos, Type site,
        MethodSymbol msym1, MethodSymbol msym2) {
    if (msym1 != msym2 &&
            allowDefaultMethods &&
            lint.isEnabled(LintCategory.OVERLOADS) &&
            (msym1.flags() & POTENTIALLY_AMBIGUOUS) == 0 &&
            (msym2.flags() & POTENTIALLY_AMBIGUOUS) == 0) {
        Type mt1 = types.memberType(site, msym1);
        Type mt2 = types.memberType(site, msym2);
        //if both generic methods, adjust type variables
        if (mt1.hasTag(FORALL) && mt2.hasTag(FORALL) &&
                types.hasSameBounds((ForAll)mt1, (ForAll)mt2)) {
            mt2 = types.subst(mt2, ((ForAll)mt2).tvars, ((ForAll)mt1).tvars);
        }
        //expand varargs methods if needed
        int maxLength = Math.max(mt1.getParameterTypes().length(), mt2.getParameterTypes().length());
        List<Type> args1 = rs.adjustArgs(mt1.getParameterTypes(), msym1, maxLength, true);
        List<Type> args2 = rs.adjustArgs(mt2.getParameterTypes(), msym2, maxLength, true);
        //if arities don't match, exit
        if (args1.length() != args2.length()) return;
        boolean potentiallyAmbiguous = false;
        while (args1.nonEmpty() && args2.nonEmpty()) {
            Type s = args1.head;
            Type t = args2.head;
            if (!types.isSubtype(t, s) && !types.isSubtype(s, t)) {
                if (types.isFunctionalInterface(s) && types.isFunctionalInterface(t) &&
                        types.findDescriptorType(s).getParameterTypes().length() > 0 &&
                        types.findDescriptorType(s).getParameterTypes().length() ==
                        types.findDescriptorType(t).getParameterTypes().length()) {
                    potentiallyAmbiguous = true;
                } else {
                    break;
                }
            }
            args1 = args1.tail;
            args2 = args2.tail;
        }
        if (potentiallyAmbiguous) {
            //we found two incompatible functional interfaces with same arity
            //this means a call site passing an implicit lambda would be ambigiuous
            msym1.flags_field |= POTENTIALLY_AMBIGUOUS;
            msym2.flags_field |= POTENTIALLY_AMBIGUOUS;
            log.warning(LintCategory.OVERLOADS, pos,
                        Warnings.PotentiallyAmbiguousOverload(msym1, msym1.location(),
                                                              msym2, msym2.location()));
            return;
        }
    }
}
 

@Override
public void visitProvides(JCProvides tree) {
    Type st = attr.attribType(tree.serviceName, env, syms.objectType);
    ClassSymbol service = (ClassSymbol) st.tsym;
    if (allProvides.containsKey(service)) {
        log.error(tree.serviceName.pos(), Errors.RepeatedProvidesForService(service));
    }
    ListBuffer<ClassSymbol> impls = new ListBuffer<>();
    for (JCExpression implName : tree.implNames) {
        Type it;
        boolean prevVisitingServiceImplementation = env.info.visitingServiceImplementation;
        try {
            env.info.visitingServiceImplementation = true;
            it = attr.attribType(implName, env, syms.objectType);
        } finally {
            env.info.visitingServiceImplementation = prevVisitingServiceImplementation;
        }
        ClassSymbol impl = (ClassSymbol) it.tsym;
        if ((impl.flags_field & PUBLIC) == 0) {
            log.error(implName.pos(), Errors.NotDefPublic(impl, impl.location()));
        }
        //find provider factory:
        MethodSymbol factory = factoryMethod(impl);
        if (factory != null) {
            Type returnType = factory.type.getReturnType();
            if (!types.isSubtype(returnType, st)) {
                log.error(implName.pos(), Errors.ServiceImplementationProviderReturnMustBeSubtypeOfServiceInterface);
            }
        } else {
            if (!types.isSubtype(it, st)) {
                log.error(implName.pos(), Errors.ServiceImplementationMustBeSubtypeOfServiceInterface);
            } else if ((impl.flags() & ABSTRACT) != 0) {
                log.error(implName.pos(), Errors.ServiceImplementationIsAbstract(impl));
            } else if (impl.isInner()) {
                log.error(implName.pos(), Errors.ServiceImplementationIsInner(impl));
            } else {
                MethodSymbol constr = noArgsConstructor(impl);
                if (constr == null) {
                    log.error(implName.pos(), Errors.ServiceImplementationDoesntHaveANoArgsConstructor(impl));
                } else if ((constr.flags() & PUBLIC) == 0) {
                    log.error(implName.pos(), Errors.ServiceImplementationNoArgsConstructorNotPublic(impl));
                }
            }
        }
        if (it.hasTag(CLASS)) {
            if (allProvides.computeIfAbsent(service, s -> new HashSet<>()).add(impl)) {
                impls.append(impl);
            } else {
                log.error(implName.pos(), Errors.DuplicateProvides(service, impl));
            }
        }
    }
    if (st.hasTag(CLASS) && !impls.isEmpty()) {
        Directive.ProvidesDirective d = new Directive.ProvidesDirective(service, impls.toList());
        msym.provides = msym.provides.prepend(d);
        msym.directives = msym.directives.prepend(d);
        directiveToTreeMap.put(d, tree);
    }
}
 

/** Add bridge if given symbol is a non-private, non-static member
 *  of the given class, which is either defined in the class or non-final
 *  inherited, and one of the two following conditions holds:
 *  1. The method's type changes in the given class, as compared to the
 *     class where the symbol was defined, (in this case
 *     we have extended a parameterized class with non-trivial parameters).
 *  2. The method has an implementation with a different erased return type.
 *     (in this case we have used co-variant returns).
 *  If a bridge already exists in some other class, no new bridge is added.
 *  Instead, it is checked that the bridge symbol overrides the method symbol.
 *  (Spec ???).
 *  todo: what about bridges for privates???
 *
 *  @param pos     The source code position to be used for the definition.
 *  @param sym     The symbol for which a bridge might have to be added.
 *  @param origin  The class in which the bridge would go.
 *  @param bridges The list buffer to which the bridge would be added.
 */
void addBridgeIfNeeded(DiagnosticPosition pos,
                       Symbol sym,
                       ClassSymbol origin,
                       ListBuffer<JCTree> bridges) {
    if (sym.kind == MTH &&
        sym.name != names.init &&
        (sym.flags() & (PRIVATE | STATIC)) == 0 &&
        (sym.flags() & SYNTHETIC) != SYNTHETIC &&
        sym.isMemberOf(origin, types))
    {
        MethodSymbol meth = (MethodSymbol)sym;
        MethodSymbol bridge = meth.binaryImplementation(origin, types);
        MethodSymbol impl = meth.implementation(origin, types, true);
        if (bridge == null ||
            bridge == meth ||
            (impl != null && !bridge.owner.isSubClass(impl.owner, types))) {
            // No bridge was added yet.
            if (impl != null && isBridgeNeeded(meth, impl, origin.type)) {
                addBridge(pos, meth, impl, origin, bridge==impl, bridges);
            } else if (impl == meth
                       && impl.owner != origin
                       && (impl.flags() & FINAL) == 0
                       && (meth.flags() & (ABSTRACT|PUBLIC)) == PUBLIC
                       && (origin.flags() & PUBLIC) > (impl.owner.flags() & PUBLIC)) {
                // this is to work around a horrible but permanent
                // reflection design error.
                addBridge(pos, meth, impl, origin, false, bridges);
            }
        } else if ((bridge.flags() & SYNTHETIC) == SYNTHETIC) {
            final Pair<MethodSymbol, MethodSymbol> bridgeSpan = bridgeSpans.get(bridge);
            MethodSymbol other = bridgeSpan == null ? null : bridgeSpan.fst;
            if (other != null && other != meth) {
                if (impl == null || !impl.overrides(other, origin, types, true)) {
                    // Is bridge effectively also the bridge for `meth', if so no clash.
                    MethodSymbol target = bridgeSpan == null ? null : bridgeSpan.snd;
                    if (target == null || !target.overrides(meth, origin, types, true, false)) {
                        // Bridge for other symbol pair was added
                        log.error(pos, Errors.NameClashSameErasureNoOverride(
                                other.name, types.memberType(origin.type, other).asMethodType().getParameterTypes(),
                                other.location(origin.type, types),
                                meth.name, types.memberType(origin.type, meth).asMethodType().getParameterTypes(),
                                meth.location(origin.type, types)));
                    }
                }
            }
        } else if (!bridge.overrides(meth, origin, types, true)) {
            // Accidental binary override without source override.
            // Don't diagnose the problem if it would already
            // have been reported in the superclass
            if (bridge.owner == origin ||
                types.asSuper(bridge.owner.type, meth.owner) == null) {
                log.error(pos, Errors.NameClashSameErasureNoOverride(
                        bridge.name, types.memberType(origin.type, bridge).asMethodType().getParameterTypes(),
                        bridge.location(origin.type, types),
                        meth.name, types.memberType(origin.type, meth).asMethodType().getParameterTypes(),
                        meth.location(origin.type, types)));
            }
        }
    }
}