Java Code Examples for com.sun.tools.javac.code.Symbol.ClassSymbol

/**
 * Return a list of all classes contained in this package, including
 * member classes of those classes, and their member classes, etc.
 */
private List<ClassDocImpl> getClasses(boolean filtered) {
    if (allClasses != null && !filtered) {
        return allClasses;
    }
    if (allClassesFiltered != null && filtered) {
        return allClassesFiltered;
    }
    ListBuffer<ClassDocImpl> classes = new ListBuffer<ClassDocImpl>();
    for (Scope.Entry e = sym.members().elems; e != null; e = e.sibling) {
        if (e.sym != null) {
            ClassSymbol s = (ClassSymbol)e.sym;
            ClassDocImpl c = env.getClassDoc(s);
            if (c != null && !c.isSynthetic())
                c.addAllClasses(classes, filtered);
        }
    }
    if (filtered)
        return allClassesFiltered = classes.toList();
    else
        return allClasses = classes.toList();
}
 

@Override
public void visitUses(JCUses tree) {
    Type st = attr.attribType(tree.qualid, env, syms.objectType);
    Symbol sym = TreeInfo.symbol(tree.qualid);
    if ((sym.flags() & ENUM) != 0) {
        log.error(tree.qualid.pos(), Errors.ServiceDefinitionIsEnum(st.tsym));
    } else if (st.hasTag(CLASS)) {
        ClassSymbol service = (ClassSymbol) st.tsym;
        if (allUses.add(service)) {
            Directive.UsesDirective d = new Directive.UsesDirective(service);
            msym.uses = msym.uses.prepend(d);
            msym.directives = msym.directives.prepend(d);
        } else {
            log.error(tree.pos(), Errors.DuplicateUses(service));
        }
    }
}
 

/** Retrieve class symbol by fully-qualified name.
 */
ClassSymbol getClassSymbol(String name) {
    // Name may contain nested class qualification.
    // Generate candidate flatnames with successively shorter
    // package qualifiers and longer nested class qualifiers.
    int nameLen = name.length();
    char[] nameChars = name.toCharArray();
    int idx = name.length();
    for (;;) {
        Name nameImpl = names.fromChars(nameChars, 0, nameLen);
        ModuleSymbol mod = syms.inferModule(Convert.packagePart(nameImpl));
        ClassSymbol s = mod != null ? syms.getClass(mod, nameImpl) : null;
        if (s != null)
            return s; // found it!
        idx = name.substring(0, idx).lastIndexOf('.');
        if (idx < 0) break;
        nameChars[idx] = '$';
    }
    return null;
}
 

/** Emit a class file for a given class.
 *  @param c      The class from which a class file is generated.
 */
public FileObject write(ClassSymbol c)
    throws IOException
{
    String className = c.flatName().toString();
    FileObject outFile
        = fileManager.getFileForOutput(StandardLocation.NATIVE_HEADER_OUTPUT,
            "", className.replaceAll("[.$]", "_") + ".h", null);
    Writer out = outFile.openWriter();
    try {
        write(out, c);
        if (verbose)
            log.printVerbose("wrote.file", outFile);
        out.close();
        out = null;
    } finally {
        if (out != null) {
            // if we are propogating an exception, delete the file
            out.close();
            outFile.delete();
            outFile = null;
        }
    }
    return outFile; // may be null if write failed
}
 

private Symbol attributeParamIdentifier(TreePath path, DCParam ptag) {
    Symbol javadocSymbol = getElement(path);
    if (javadocSymbol == null)
        return null;
    ElementKind kind = javadocSymbol.getKind();
    List<? extends Symbol> params = List.nil();
    if (kind == ElementKind.METHOD || kind == ElementKind.CONSTRUCTOR) {
        MethodSymbol ee = (MethodSymbol) javadocSymbol;
        params = ptag.isTypeParameter()
                ? ee.getTypeParameters()
                : ee.getParameters();
    } else if (kind.isClass() || kind.isInterface()) {
        ClassSymbol te = (ClassSymbol) javadocSymbol;
        params = te.getTypeParameters();
    }

    for (Symbol param : params) {
        if (param.getSimpleName() == ptag.getName().getName()) {
            return param;
        }
    }
    return null;
}
 

private Type bsmStaticArgToType(Object arg) {
    Assert.checkNonNull(arg);
    if (arg instanceof ClassSymbol) {
        return syms.classType;
    } else if (arg instanceof Integer) {
        return syms.intType;
    } else if (arg instanceof Long) {
        return syms.longType;
    } else if (arg instanceof Float) {
        return syms.floatType;
    } else if (arg instanceof Double) {
        return syms.doubleType;
    } else if (arg instanceof String) {
        return syms.stringType;
    } else if (arg instanceof Pool.MethodHandle) {
        return syms.methodHandleType;
    } else if (arg instanceof MethodType) {
        return syms.methodTypeType;
    } else {
        Assert.error("bad static arg " + arg.getClass());
        return null;
    }
}
 

@Override
public void visitUses(JCUses tree) {
    Type st = attr.attribType(tree.qualid, env, syms.objectType);
    Symbol sym = TreeInfo.symbol(tree.qualid);
    if ((sym.flags() & ENUM) != 0) {
        log.error(tree.qualid.pos(), Errors.ServiceDefinitionIsEnum(st.tsym));
    } else if (st.hasTag(CLASS)) {
        ClassSymbol service = (ClassSymbol) st.tsym;
        if (allUses.add(service)) {
            Directive.UsesDirective d = new Directive.UsesDirective(service);
            msym.uses = msym.uses.prepend(d);
            msym.directives = msym.directives.prepend(d);
        } else {
            log.error(tree.pos(), Errors.DuplicateUses(service));
        }
    }
}
 

private VarSymbol getDefinedSerializableFields(ClassSymbol def) {
    Names names = def.name.table.names;

    /* SERIALIZABLE_FIELDS can be private,
     * so must lookup by ClassSymbol, not by ClassDocImpl.
     */
    for (Scope.Entry e = def.members().lookup(names.fromString(SERIALIZABLE_FIELDS)); e.scope != null; e = e.next()) {
        if (e.sym.kind == Kinds.VAR) {
            VarSymbol f = (VarSymbol)e.sym;
            if ((f.flags() & Flags.STATIC) != 0 &&
                (f.flags() & Flags.PRIVATE) != 0) {
                return f;
            }
        }
    }
    return null;
}
 

void show(String label, Element e) {
    System.err.println(sp(indent) + label
            + ": mods:" + e.getModifiers()
            + " " + e.getSimpleName()
            + ", kind: " + e.getKind()
            + ", type: " + e.asType()
            + ", encl: " + e.getEnclosingElement());

    // The following checks help establish why NPE might occur when trying to scan children
    if (e instanceof ClassSymbol) {
        ClassSymbol csym = (ClassSymbol) e;
        if (csym.members_field == null)
            error("members_field is null");
        if (csym.type == null)
            System.err.println("type is null");
    }
}
 

private VarSymbol getDefinedSerializableFields(ClassSymbol def) {
    Names names = def.name.table.names;

    /* SERIALIZABLE_FIELDS can be private,
     */
    for (Symbol sym : def.members().getSymbolsByName(names.fromString(SERIALIZABLE_FIELDS))) {
        if (sym.kind == VAR) {
            VarSymbol f = (VarSymbol) sym;
            if ((f.flags() & Flags.STATIC) != 0
                    && (f.flags() & Flags.PRIVATE) != 0) {
                return f;
            }
        }
    }
    return null;
}
 

/** Load a toplevel class with given fully qualified name
 *  The class is entered into `classes' only if load was successful.
 */
public ClassSymbol loadClass(ModuleSymbol msym, Name flatname) throws CompletionFailure {
    Assert.checkNonNull(msym);
    Name packageName = Convert.packagePart(flatname);
    PackageSymbol ps = syms.lookupPackage(msym, packageName);

    Assert.checkNonNull(ps.modle, () -> "msym=" + msym + "; flatName=" + flatname);

    boolean absent = syms.getClass(ps.modle, flatname) == null;
    ClassSymbol c = syms.enterClass(ps.modle, flatname);

    if (c.members_field == null) {
        try {
            c.complete();
        } catch (CompletionFailure ex) {
            if (absent) syms.removeClass(ps.modle, flatname);
            throw ex;
        }
    }
    return c;
}
 

/**
 * Returns a symbol given the type's or package's canonical name,
 * or null if the name isn't found.
 */
private <S extends Symbol> S nameToSymbol(ModuleSymbol module, String nameStr, Class<S> clazz) {
    Name name = names.fromString(nameStr);
    // First check cache.
    Symbol sym = (clazz == ClassSymbol.class)
                ? syms.getClass(module, name)
                : syms.lookupPackage(module, name);

    try {
        if (sym == null)
            sym = javaCompiler.resolveIdent(module, nameStr);

        sym.complete();

        return (sym.kind != ERR &&
                sym.exists() &&
                clazz.isInstance(sym) &&
                name.equals(sym.getQualifiedName()))
            ? clazz.cast(sym)
            : null;
    } catch (CompletionFailure e) {
        return null;
    }
}
 

@Override
public void push(ClassSymbol s, CompletionCause phase) {
    String flatname = s.flatName().toString();
    for (Phase p : Phase.values()) {
        if (phase == p.cause) {
            inProcess.push(new PhaseDescription(flatname, p));
            return ;
        }
    }
    if (phase == CompletionCause.MEMBER_ENTER) {
        if (inProcess.isEmpty()) {
            topLevelMemberEnter = flatname;
        } else {
            for (PhaseDescription running : inProcess) {
                if (running == null)
                    continue;

                Set<PhaseDescription> completing =
                        topLevel2Completing.computeIfAbsent(running.flatname, $ -> new HashSet<>());

                completing.add(new PhaseDescription(flatname, running.phase));
            }
        }
    }
    inProcess.push(null);
}
 

/** Write "inner classes" attribute.
 */
void writeInnerClasses() {
    int alenIdx = writeAttr(names.InnerClasses);
    databuf.appendChar(innerClassesQueue.length());
    for (List<ClassSymbol> l = innerClassesQueue.toList();
         l.nonEmpty();
         l = l.tail) {
        ClassSymbol inner = l.head;
        inner.markAbstractIfNeeded(types);
        char flags = (char) adjustFlags(inner.flags_field);
        if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
        flags &= ~STRICTFP; //inner classes should not have the strictfp flag set.
        if (dumpInnerClassModifiers) {
            PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
            pw.println("INNERCLASS  " + inner.name);
            pw.println("---" + flagNames(flags));
        }
        databuf.appendChar(pool.get(inner));
        databuf.appendChar(
            inner.owner.kind == TYP && !inner.name.isEmpty() ? pool.get(inner.owner) : 0);
        databuf.appendChar(
            !inner.name.isEmpty() ? pool.get(inner.name) : 0);
        databuf.appendChar(flags);
    }
    endAttr(alenIdx);
}
 

/**
 * Return a list of all classes contained in this package, including
 * member classes of those classes, and their member classes, etc.
 */
private List<ClassDocImpl> getClasses(boolean filtered) {
    if (allClasses != null && !filtered) {
        return allClasses;
    }
    if (allClassesFiltered != null && filtered) {
        return allClassesFiltered;
    }
    ListBuffer<ClassDocImpl> classes = new ListBuffer<ClassDocImpl>();
    for (Scope.Entry e = sym.members().elems; e != null; e = e.sibling) {
        if (e.sym != null) {
            ClassSymbol s = (ClassSymbol)e.sym;
            ClassDocImpl c = env.getClassDoc(s);
            if (c != null && !c.isSynthetic())
                c.addAllClasses(classes, filtered);
        }
    }
    if (filtered)
        return allClassesFiltered = classes.toList();
    else
        return allClasses = classes.toList();
}
 

private Symbol attributeParamIdentifier(TreePath path, DCParam ptag) {
    Symbol javadocSymbol = getElement(path);
    if (javadocSymbol == null)
        return null;
    ElementKind kind = javadocSymbol.getKind();
    List<? extends Symbol> params = List.nil();
    if (kind == ElementKind.METHOD || kind == ElementKind.CONSTRUCTOR) {
        MethodSymbol ee = (MethodSymbol) javadocSymbol;
        params = ptag.isTypeParameter()
                ? ee.getTypeParameters()
                : ee.getParameters();
    } else if (kind.isClass() || kind.isInterface()) {
        ClassSymbol te = (ClassSymbol) javadocSymbol;
        params = te.getTypeParameters();
    }

    for (Symbol param : params) {
        if (param.getSimpleName() == ptag.getName().getName()) {
            return param;
        }
    }
    return null;
}
 

public void checkFunctionalInterface(JCClassDecl tree, ClassSymbol cs) {
    Compound functionalType = cs.attribute(syms.functionalInterfaceType.tsym);

    if (functionalType != null) {
        try {
            types.findDescriptorSymbol((TypeSymbol)cs);
        } catch (Types.FunctionDescriptorLookupError ex) {
            DiagnosticPosition pos = tree.pos();
            for (JCAnnotation a : tree.getModifiers().annotations) {
                if (a.annotationType.type.tsym == syms.functionalInterfaceType.tsym) {
                    pos = a.pos();
                    break;
                }
            }
            log.error(pos, Errors.BadFunctionalIntfAnno1(ex.getDiagnostic()));
        }
    }
}
 

EnumMapping(DiagnosticPosition pos, TypeSymbol forEnum) {
    this.forEnum = forEnum;
    this.values = new LinkedHashMap<>();
    this.pos = pos;
    Name varName = names
        .fromString(target.syntheticNameChar() +
                    "SwitchMap" +
                    target.syntheticNameChar() +
                    writer.xClassName(forEnum.type).toString()
                    .replace('/', '.')
                    .replace('.', target.syntheticNameChar()));
    ClassSymbol outerCacheClass = outerCacheClass();
    this.mapVar = new VarSymbol(STATIC | SYNTHETIC | FINAL,
                                varName,
                                new ArrayType(syms.intType, syms.arrayClass),
                                outerCacheClass);
    enterSynthetic(pos, mapVar, outerCacheClass.members());
}
 

void captureLocalClassDefs(Symbol csym, final LambdaTranslationContext lambdaContext) {
        JCClassDecl localCDef = localClassDefs.get(csym);
        if (localCDef != null && lambdaContext.freeVarProcessedLocalClasses.add(csym)) {
            BasicFreeVarCollector fvc = lower.new BasicFreeVarCollector() {
                @Override
                void addFreeVars(ClassSymbol c) {
                    captureLocalClassDefs(c, lambdaContext);
                }
                @Override
                void visitSymbol(Symbol sym) {
                    if (sym.kind == VAR &&
                            sym.owner.kind == MTH &&
                            ((VarSymbol)sym).getConstValue() == null) {
                        TranslationContext<?> localContext = context();
                        while (localContext != null) {
                            if (localContext.tree.getTag() == LAMBDA) {
                                JCTree block = capturedDecl(localContext.depth, sym);
                                if (block == null) break;
                                ((LambdaTranslationContext)localContext).addSymbol(sym, CAPTURED_VAR);
                            }
                            localContext = localContext.prev;
                        }
                    }
                }
            };
            fvc.scan(localCDef);
        }
}
 

public ClassSymbol resolveClass(String qualifiedClass) throws CouldNotResolveImportException {
  Symbol symbol = JavaCompiler.instance(context).resolveIdent(qualifiedClass);
  if (symbol.equals(symtab().errSymbol) || !(symbol instanceof ClassSymbol)) {
    throw new CouldNotResolveImportException(qualifiedClass);
  } else {
    return (ClassSymbol) symbol;
  }
}
 

public boolean needsHeader(ClassSymbol c) {
    if (c.isLocal() || (c.flags() & Flags.SYNTHETIC) != 0)
        return false;

    if (checkAll)
        return needsHeader(c.outermostClass(), true);
    else
        return needsHeader(c, false);
}
 

public boolean needsHeader(ClassSymbol c) {
    lazyInit();
    if (c.isLocal() || isSynthetic(c))
        return false;
    return (checkAll)
            ? needsHeader(c.outermostClass(), true)
            : needsHeader(c, false);
}
 

/** 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()));
    }
}
 

@Override
public void visitClassDef(JCClassDecl tree) {
    List<Frame> prevStack = frameStack;
    SyntheticMethodNameCounter prevSyntheticMethodNameCounts =
            syntheticMethodNameCounts;
    Map<ClassSymbol, Symbol> prevClinits = clinits;
    DiagnosticSource prevSource = log.currentSource();
    try {
        log.useSource(tree.sym.sourcefile);
        syntheticMethodNameCounts = new SyntheticMethodNameCounter();
        prevClinits = new HashMap<ClassSymbol, Symbol>();
        if (tree.sym.owner.kind == MTH) {
            localClassDefs.put(tree.sym, tree);
        }
        if (directlyEnclosingLambda() != null) {
            tree.sym.owner = owner();
            if (tree.sym.hasOuterInstance()) {
                //if a class is defined within a lambda, the lambda must capture
                //its enclosing instance (if any)
                TranslationContext<?> localContext = context();
                while (localContext != null) {
                    if (localContext.tree.getTag() == LAMBDA) {
                        ((LambdaTranslationContext)localContext)
                                .addSymbol(tree.sym.type.getEnclosingType().tsym, CAPTURED_THIS);
                    }
                    localContext = localContext.prev;
                }
            }
        }
        frameStack = frameStack.prepend(new Frame(tree));
        super.visitClassDef(tree);
    }
    finally {
        log.useSource(prevSource.getFile());
        frameStack = prevStack;
        syntheticMethodNameCounts = prevSyntheticMethodNameCounts;
        clinits = prevClinits;
    }
}
 

protected void writeStatics(Writer out, ClassSymbol sym) throws IOException {
    List<VariableElement> classfields = getAllFields(sym);

    for (VariableElement v: classfields) {
        if (!v.getModifiers().contains(Modifier.STATIC))
            continue;
        String s = null;
        s = defineForStatic(sym, v);
        if (s != null) {
            println(out, s);
        }
    }
}
 

public boolean isAccessible(Scope scope, TypeElement type) {
    if (scope instanceof JavacScope && type instanceof ClassSymbol) {
        Env<AttrContext> env = ((JavacScope) scope).env;
        return resolve.isAccessible(env, (ClassSymbol)type, true);
    } else
        return false;
}
 

/** Complete entering a class.
 *  @param sym         The symbol of the class to be completed.
 */
@Override
public void complete(Symbol sym) throws CompletionFailure {
    // Suppress some (recursive) MemberEnter invocations
    if (!completionEnabled) {
        // Re-install same completer for next time around and return.
        Assert.check((sym.flags() & Flags.COMPOUND) == 0);
        sym.completer = this;
        return;
    }

    try {
        annotate.blockAnnotations();
        sym.flags_field |= UNATTRIBUTED;

        List<Env<AttrContext>> queue;

        dependencies.push((ClassSymbol) sym, CompletionCause.MEMBER_ENTER);
        try {
            queue = completeClass.completeEnvs(List.of(typeEnvs.get((ClassSymbol) sym)));
        } finally {
            dependencies.pop();
        }

        if (!queue.isEmpty()) {
            Set<JCCompilationUnit> seen = new HashSet<>();

            for (Env<AttrContext> env : queue) {
                if (env.toplevel.defs.contains(env.enclClass) && seen.add(env.toplevel)) {
                    finishImports(env.toplevel, () -> {});
                }
            }
        }
    } finally {
        annotate.unblockAnnotations();
    }
}
 

AnnotationCompleter(Symbol sym, List<CompoundAnnotationProxy> l) {
    super(currentOwner.kind == MTH
            ? currentOwner.enclClass() : (ClassSymbol)currentOwner);
    if (sym.kind == TYP && sym.owner.kind == MDL) {
        this.sym = sym.owner;
    } else {
        this.sym = sym;
    }
    this.l = l;
    this.classFile = currentClassFile;
}
 

@SuppressWarnings("fallthrough")
private static com.sun.javadoc.Type getTypeImpl(DocEnv env, Type t,
        boolean errToClassDoc, boolean considerAnnotations) {
    if (env.legacyDoclet) {
        t = env.types.erasure(t);
    }

    if (considerAnnotations && t.isAnnotated()) {
        return new AnnotatedTypeImpl(env, t);
    }

    switch (t.getTag()) {
    case CLASS:
        if (ClassDocImpl.isGeneric((ClassSymbol)t.tsym)) {
            return env.getParameterizedType((ClassType)t);
        } else {
            return env.getClassDoc((ClassSymbol)t.tsym);
        }
    case WILDCARD:
        Type.WildcardType a = (Type.WildcardType)t;
        return new WildcardTypeImpl(env, a);
    case TYPEVAR: return new TypeVariableImpl(env, (TypeVar)t);
    case ARRAY: return new ArrayTypeImpl(env, t);
    case BYTE: return PrimitiveType.byteType;
    case CHAR: return PrimitiveType.charType;
    case SHORT: return PrimitiveType.shortType;
    case INT: return PrimitiveType.intType;
    case LONG: return PrimitiveType.longType;
    case FLOAT: return PrimitiveType.floatType;
    case DOUBLE: return PrimitiveType.doubleType;
    case BOOLEAN: return PrimitiveType.booleanType;
    case VOID: return PrimitiveType.voidType;
    case ERROR:
        if (errToClassDoc)
            return env.getClassDoc((ClassSymbol)t.tsym);
        // FALLTHRU
    default:
        return new PrimitiveType(t.tsym.getQualifiedName().toString());
    }
}
 

@Override
public void visitExports(JCExports tree) {
    Iterable<Symbol> packageContent = tree.directive.packge.members().getSymbols();
    List<JavaFileObject> filesToCheck = List.nil();
    boolean packageNotEmpty = false;
    for (Symbol sym : packageContent) {
        if (sym.kind != Kinds.Kind.TYP)
            continue;
        ClassSymbol csym = (ClassSymbol) sym;
        if (sym.completer.isTerminal() ||
            csym.classfile.getKind() == Kind.CLASS) {
            packageNotEmpty = true;
            filesToCheck = List.nil();
            break;
        }
        if (csym.classfile.getKind() == Kind.SOURCE) {
            filesToCheck = filesToCheck.prepend(csym.classfile);
        }
    }
    for (JavaFileObject jfo : filesToCheck) {
        if (findPackageInFile.findPackageNameOf(jfo) == tree.directive.packge.fullname) {
            packageNotEmpty = true;
            break;
        }
    }
    if (!packageNotEmpty) {
        log.error(tree.qualid.pos(), Errors.PackageEmptyOrNotFound(tree.directive.packge));
    }
    msym.directives = msym.directives.prepend(tree.directive);
}