jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/comp/TransTypes.java@c002fdee76fd (annotated)

src/share/classes/com/sun/tools/javac/comp/TransTypes.java@c002fdee76fd (annotated)

src/share/classes/com/sun/tools/javac/comp/TransTypes.java

Thu, 25 Oct 2012 11:09:36 -0700

author: jjg
date: Thu, 25 Oct 2012 11:09:36 -0700
changeset 1374: c002fdee76fd
parent 1358: fc123bdeddb8
child 1380: a65971893c50
permissions: -rw-r--r--

7200915: convert TypeTags from a series of small ints to an enum
Reviewed-by: jjg, mcimadamore
Contributed-by: vicente.romero@oracle.com

 /*
  * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package com.sun.tools.javac.comp;
 import java.util.*;
 import com.sun.tools.javac.code.*;
 import com.sun.tools.javac.code.Symbol.*;
 import com.sun.tools.javac.tree.*;
 import com.sun.tools.javac.tree.JCTree.*;
 import com.sun.tools.javac.util.*;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
 import com.sun.tools.javac.util.List;
 import static com.sun.tools.javac.code.Flags.*;
 import static com.sun.tools.javac.code.Kinds.*;
 import static com.sun.tools.javac.code.TypeTag.CLASS;
 import static com.sun.tools.javac.code.TypeTag.TYPEVAR;
 import static com.sun.tools.javac.code.TypeTag.VOID;
 /** This pass translates Generic Java to conventional Java.
  *
  *  <p><b>This is NOT part of any supported API.
  *  If you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class TransTypes extends TreeTranslator {
     /** The context key for the TransTypes phase. */
     protected static final Context.Key<TransTypes> transTypesKey =
         new Context.Key<TransTypes>();
     /** Get the instance for this context. */
     public static TransTypes instance(Context context) {
         TransTypes instance = context.get(transTypesKey);
         if (instance == null)
             instance = new TransTypes(context);
         return instance;
     }
     private Names names;
     private Log log;
     private Symtab syms;
     private TreeMaker make;
     private Enter enter;
     private boolean allowEnums;
     private Types types;
     private final Resolve resolve;
     /**
      * Flag to indicate whether or not to generate bridge methods.
      * For pre-Tiger source there is no need for bridge methods, so it
      * can be skipped to get better performance for -source 1.4 etc.
      */
     private final boolean addBridges;
     protected TransTypes(Context context) {
         context.put(transTypesKey, this);
         names = Names.instance(context);
         log = Log.instance(context);
         syms = Symtab.instance(context);
         enter = Enter.instance(context);
         overridden = new HashMap<MethodSymbol,MethodSymbol>();
         Source source = Source.instance(context);
         allowEnums = source.allowEnums();
         addBridges = source.addBridges();
         types = Types.instance(context);
         make = TreeMaker.instance(context);
         resolve = Resolve.instance(context);
     }
     /** A hashtable mapping bridge methods to the methods they override after
      *  type erasure.
      */
     Map<MethodSymbol,MethodSymbol> overridden;
     /** Construct an attributed tree for a cast of expression to target type,
      *  unless it already has precisely that type.
      *  @param tree    The expression tree.
      *  @param target  The target type.
      */
     JCExpression cast(JCExpression tree, Type target) {
         int oldpos = make.pos;
         make.at(tree.pos);
         if (!types.isSameType(tree.type, target)) {
             if (!resolve.isAccessible(env, target.tsym))
                 resolve.logAccessErrorInternal(env, tree, target);
             tree = make.TypeCast(make.Type(target), tree).setType(target);
         }
         make.pos = oldpos;
         return tree;
     }
     /** Construct an attributed tree to coerce an expression to some erased
      *  target type, unless the expression is already assignable to that type.
      *  If target type is a constant type, use its base type instead.
      *  @param tree    The expression tree.
      *  @param target  The target type.
      */
     JCExpression coerce(JCExpression tree, Type target) {
         Type btarget = target.baseType();
         if (tree.type.isPrimitive() == target.isPrimitive()) {
             return types.isAssignable(tree.type, btarget, Warner.noWarnings)
                 ? tree
                 : cast(tree, btarget);
         }
         return tree;
     }
     /** Given an erased reference type, assume this type as the tree's type.
      *  Then, coerce to some given target type unless target type is null.
      *  This operation is used in situations like the following:
      *
      *  <pre>{@code
      *  class Cell<A> { A value; }
      *  ...
      *  Cell<Integer> cell;
      *  Integer x = cell.value;
      *  }</pre>
      *
      *  Since the erasure of Cell.value is Object, but the type
      *  of cell.value in the assignment is Integer, we need to
      *  adjust the original type of cell.value to Object, and insert
      *  a cast to Integer. That is, the last assignment becomes:
      *
      *  <pre>{@code
      *  Integer x = (Integer)cell.value;
      *  }</pre>
      *
      *  @param tree       The expression tree whose type might need adjustment.
      *  @param erasedType The expression's type after erasure.
      *  @param target     The target type, which is usually the erasure of the
      *                    expression's original type.
      */
     JCExpression retype(JCExpression tree, Type erasedType, Type target) {
 //      System.err.println("retype " + tree + " to " + erasedType);//DEBUG
         if (!erasedType.isPrimitive()) {
             if (target != null && target.isPrimitive())
                 target = erasure(tree.type);
             tree.type = erasedType;
             if (target != null) return coerce(tree, target);
         }
         return tree;
     }
     /** Translate method argument list, casting each argument
      *  to its corresponding type in a list of target types.
      *  @param _args            The method argument list.
      *  @param parameters       The list of target types.
      *  @param varargsElement   The erasure of the varargs element type,
      *  or null if translating a non-varargs invocation
      */
     <T extends JCTree> List<T> translateArgs(List<T> _args,
                                            List<Type> parameters,
                                            Type varargsElement) {
         if (parameters.isEmpty()) return _args;
         List<T> args = _args;
         while (parameters.tail.nonEmpty()) {
             args.head = translate(args.head, parameters.head);
             args = args.tail;
             parameters = parameters.tail;
         }
         Type parameter = parameters.head;
         Assert.check(varargsElement != null || args.length() == 1);
         if (varargsElement != null) {
             while (args.nonEmpty()) {
                 args.head = translate(args.head, varargsElement);
                 args = args.tail;
             }
         } else {
             args.head = translate(args.head, parameter);
         }
         return _args;
     }
     /** Add a bridge definition and enter corresponding method symbol in
      *  local scope of origin.
      *
      *  @param pos     The source code position to be used for the definition.
      *  @param meth    The method for which a bridge needs to be added
      *  @param impl    That method's implementation (possibly the method itself)
      *  @param origin  The class to which the bridge will be added
      *  @param hypothetical
      *                 True if the bridge method is not strictly necessary in the
      *                 binary, but is represented in the symbol table to detect
      *                 erasure clashes.
      *  @param bridges The list buffer to which the bridge will be added
      */
     void addBridge(DiagnosticPosition pos,
                    MethodSymbol meth,
                    MethodSymbol impl,
                    ClassSymbol origin,
                    boolean hypothetical,
                    ListBuffer<JCTree> bridges) {
         make.at(pos);
         Type origType = types.memberType(origin.type, meth);
         Type origErasure = erasure(origType);
         // Create a bridge method symbol and a bridge definition without a body.
         Type bridgeType = meth.erasure(types);
         long flags = impl.flags() & AccessFlags | SYNTHETIC | BRIDGE;
         if (hypothetical) flags |= HYPOTHETICAL;
         MethodSymbol bridge = new MethodSymbol(flags,
                                                meth.name,
                                                bridgeType,
                                                origin);
         if (!hypothetical) {
             JCMethodDecl md = make.MethodDef(bridge, null);
             // The bridge calls this.impl(..), if we have an implementation
             // in the current class, super.impl(...) otherwise.
             JCExpression receiver = (impl.owner == origin)
                 ? make.This(origin.erasure(types))
                 : make.Super(types.supertype(origin.type).tsym.erasure(types), origin);
             // The type returned from the original method.
             Type calltype = erasure(impl.type.getReturnType());
             // Construct a call of  this.impl(params), or super.impl(params),
             // casting params and possibly results as needed.
             JCExpression call =
                 make.Apply(
                            null,
                            make.Select(receiver, impl).setType(calltype),
                            translateArgs(make.Idents(md.params), origErasure.getParameterTypes(), null))
                 .setType(calltype);
             JCStatement stat = (origErasure.getReturnType().hasTag(VOID))
                 ? make.Exec(call)
                 : make.Return(coerce(call, bridgeType.getReturnType()));
             md.body = make.Block(0, List.of(stat));
             // Add bridge to `bridges' buffer
             bridges.append(md);
         }
         // Add bridge to scope of enclosing class and `overridden' table.
         origin.members().enter(bridge);
         overridden.put(bridge, meth);
     }
     /** 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 | OVERRIDE_BRIDGE)) != SYNTHETIC &&
             sym.isMemberOf(origin, types))
         {
             MethodSymbol meth = (MethodSymbol)sym;
             MethodSymbol bridge = meth.binaryImplementation(origin, types);
             MethodSymbol impl = meth.implementation(origin, types, true, overrideBridgeFilter);
             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 | OVERRIDE_BRIDGE)) == SYNTHETIC) {
                 MethodSymbol other = overridden.get(bridge);
                 if (other != null && other != meth) {
                     if (impl == null || !impl.overrides(other, origin, types, true)) {
                         // Bridge for other symbol pair was added
                         log.error(pos, "name.clash.same.erasure.no.override",
                                   other, other.location(origin.type, types),
                                   meth,  meth.location(origin.type, types));
                     }
                 }
             } else if (!bridge.overrides(meth, origin, types, true)) {
                 // Accidental binary override without source override.
                 if (bridge.owner == origin ||
                     types.asSuper(bridge.owner.type, meth.owner) == null)
                     // Don't diagnose the problem if it would already
                     // have been reported in the superclass
                     log.error(pos, "name.clash.same.erasure.no.override",
                               bridge, bridge.location(origin.type, types),
                               meth,  meth.location(origin.type, types));
             }
         }
     }
     // where
         Filter<Symbol> overrideBridgeFilter = new Filter<Symbol>() {
             public boolean accepts(Symbol s) {
                 return (s.flags() & (SYNTHETIC | OVERRIDE_BRIDGE)) != SYNTHETIC;
             }
         };
         /**
          * @param method The symbol for which a bridge might have to be added
          * @param impl The implementation of method
          * @param dest The type in which the bridge would go
          */
         private boolean isBridgeNeeded(MethodSymbol method,
                                        MethodSymbol impl,
                                        Type dest) {
             if (impl != method) {
                 // If either method or impl have different erasures as
                 // members of dest, a bridge is needed.
                 Type method_erasure = method.erasure(types);
                 if (!isSameMemberWhenErased(dest, method, method_erasure))
                     return true;
                 Type impl_erasure = impl.erasure(types);
                 if (!isSameMemberWhenErased(dest, impl, impl_erasure))
                     return true;
                 // If the erasure of the return type is different, a
                 // bridge is needed.
                 return !types.isSameType(impl_erasure.getReturnType(),
                                          method_erasure.getReturnType());
             } else {
                // method and impl are the same...
                 if ((method.flags() & ABSTRACT) != 0) {
                     // ...and abstract so a bridge is not needed.
                     // Concrete subclasses will bridge as needed.
                     return false;
                 }
                 // The erasure of the return type is always the same
                 // for the same symbol.  Reducing the three tests in
                 // the other branch to just one:
                 return !isSameMemberWhenErased(dest, method, method.erasure(types));
             }
         }
         /**
          * Lookup the method as a member of the type.  Compare the
          * erasures.
          * @param type the class where to look for the method
          * @param method the method to look for in class
          * @param erasure the erasure of method
          */
         private boolean isSameMemberWhenErased(Type type,
                                                MethodSymbol method,
                                                Type erasure) {
             return types.isSameType(erasure(types.memberType(type, method)),
                                     erasure);
         }
     void addBridges(DiagnosticPosition pos,
                     TypeSymbol i,
                     ClassSymbol origin,
                     ListBuffer<JCTree> bridges) {
         for (Scope.Entry e = i.members().elems; e != null; e = e.sibling)
             addBridgeIfNeeded(pos, e.sym, origin, bridges);
         for (List<Type> l = types.interfaces(i.type); l.nonEmpty(); l = l.tail)
             addBridges(pos, l.head.tsym, origin, bridges);
     }
     /** Add all necessary bridges to some class appending them to list buffer.
      *  @param pos     The source code position to be used for the bridges.
      *  @param origin  The class in which the bridges go.
      *  @param bridges The list buffer to which the bridges are added.
      */
     void addBridges(DiagnosticPosition pos, ClassSymbol origin, ListBuffer<JCTree> bridges) {
         Type st = types.supertype(origin.type);
         while (st.hasTag(CLASS)) {
 //          if (isSpecialization(st))
             addBridges(pos, st.tsym, origin, bridges);
             st = types.supertype(st);
         }
         for (List<Type> l = types.interfaces(origin.type); l.nonEmpty(); l = l.tail)
 //          if (isSpecialization(l.head))
             addBridges(pos, l.head.tsym, origin, bridges);
     }
 /* ************************************************************************
  * Visitor methods
  *************************************************************************/
     /** Visitor argument: proto-type.
      */
     private Type pt;
     /** Visitor method: perform a type translation on tree.
      */
     public <T extends JCTree> T translate(T tree, Type pt) {
         Type prevPt = this.pt;
         try {
             this.pt = pt;
             return translate(tree);
         } finally {
             this.pt = prevPt;
         }
     }
     /** Visitor method: perform a type translation on list of trees.
      */
     public <T extends JCTree> List<T> translate(List<T> trees, Type pt) {
         Type prevPt = this.pt;
         List<T> res;
         try {
             this.pt = pt;
             res = translate(trees);
         } finally {
             this.pt = prevPt;
         }
         return res;
     }
     public void visitClassDef(JCClassDecl tree) {
         translateClass(tree.sym);
         result = tree;
     }
     JCMethodDecl currentMethod = null;
     public void visitMethodDef(JCMethodDecl tree) {
         JCMethodDecl previousMethod = currentMethod;
         try {
             currentMethod = tree;
             tree.restype = translate(tree.restype, null);
             tree.typarams = List.nil();
             tree.params = translateVarDefs(tree.params);
             tree.thrown = translate(tree.thrown, null);
             tree.body = translate(tree.body, tree.sym.erasure(types).getReturnType());
             tree.type = erasure(tree.type);
             result = tree;
         } finally {
             currentMethod = previousMethod;
         }
         // Check that we do not introduce a name clash by erasing types.
         for (Scope.Entry e = tree.sym.owner.members().lookup(tree.name);
              e.sym != null;
              e = e.next()) {
             if (e.sym != tree.sym &&
                 types.isSameType(erasure(e.sym.type), tree.type)) {
                 log.error(tree.pos(),
                           "name.clash.same.erasure", tree.sym,
                           e.sym);
                 return;
             }
         }
     }
     public void visitVarDef(JCVariableDecl tree) {
         tree.vartype = translate(tree.vartype, null);
         tree.init = translate(tree.init, tree.sym.erasure(types));
         tree.type = erasure(tree.type);
         result = tree;
     }
     public void visitDoLoop(JCDoWhileLoop tree) {
         tree.body = translate(tree.body);
         tree.cond = translate(tree.cond, syms.booleanType);
         result = tree;
     }
     public void visitWhileLoop(JCWhileLoop tree) {
         tree.cond = translate(tree.cond, syms.booleanType);
         tree.body = translate(tree.body);
         result = tree;
     }
     public void visitForLoop(JCForLoop tree) {
         tree.init = translate(tree.init, null);
         if (tree.cond != null)
             tree.cond = translate(tree.cond, syms.booleanType);
         tree.step = translate(tree.step, null);
         tree.body = translate(tree.body);
         result = tree;
     }
     public void visitForeachLoop(JCEnhancedForLoop tree) {
         tree.var = translate(tree.var, null);
         Type iterableType = tree.expr.type;
         tree.expr = translate(tree.expr, erasure(tree.expr.type));
         if (types.elemtype(tree.expr.type) == null)
             tree.expr.type = iterableType; // preserve type for Lower
         tree.body = translate(tree.body);
         result = tree;
     }
     public void visitSwitch(JCSwitch tree) {
         Type selsuper = types.supertype(tree.selector.type);
         boolean enumSwitch = selsuper != null &&
             selsuper.tsym == syms.enumSym;
         Type target = enumSwitch ? erasure(tree.selector.type) : syms.intType;
         tree.selector = translate(tree.selector, target);
         tree.cases = translateCases(tree.cases);
         result = tree;
     }
     public void visitCase(JCCase tree) {
         tree.pat = translate(tree.pat, null);
         tree.stats = translate(tree.stats);
         result = tree;
     }
     public void visitSynchronized(JCSynchronized tree) {
         tree.lock = translate(tree.lock, erasure(tree.lock.type));
         tree.body = translate(tree.body);
         result = tree;
     }
     public void visitTry(JCTry tree) {
         tree.resources = translate(tree.resources, syms.autoCloseableType);
         tree.body = translate(tree.body);
         tree.catchers = translateCatchers(tree.catchers);
         tree.finalizer = translate(tree.finalizer);
         result = tree;
     }
     public void visitConditional(JCConditional tree) {
         tree.cond = translate(tree.cond, syms.booleanType);
         tree.truepart = translate(tree.truepart, erasure(tree.type));
         tree.falsepart = translate(tree.falsepart, erasure(tree.type));
         tree.type = erasure(tree.type);
         result = retype(tree, tree.type, pt);
     }
    public void visitIf(JCIf tree) {
         tree.cond = translate(tree.cond, syms.booleanType);
         tree.thenpart = translate(tree.thenpart);
         tree.elsepart = translate(tree.elsepart);
         result = tree;
     }
     public void visitExec(JCExpressionStatement tree) {
         tree.expr = translate(tree.expr, null);
         result = tree;
     }
     public void visitReturn(JCReturn tree) {
         tree.expr = translate(tree.expr, currentMethod.sym.erasure(types).getReturnType());
         result = tree;
     }
     public void visitThrow(JCThrow tree) {
         tree.expr = translate(tree.expr, erasure(tree.expr.type));
         result = tree;
     }
     public void visitAssert(JCAssert tree) {
         tree.cond = translate(tree.cond, syms.booleanType);
         if (tree.detail != null)
             tree.detail = translate(tree.detail, erasure(tree.detail.type));
         result = tree;
     }
     public void visitApply(JCMethodInvocation tree) {
         tree.meth = translate(tree.meth, null);
         Symbol meth = TreeInfo.symbol(tree.meth);
         Type mt = meth.erasure(types);
         List<Type> argtypes = mt.getParameterTypes();
         if (allowEnums &&
             meth.name==names.init &&
             meth.owner == syms.enumSym)
             argtypes = argtypes.tail.tail;
         if (tree.varargsElement != null)
             tree.varargsElement = types.erasure(tree.varargsElement);
         else
             Assert.check(tree.args.length() == argtypes.length());
         tree.args = translateArgs(tree.args, argtypes, tree.varargsElement);
         // Insert casts of method invocation results as needed.
         result = retype(tree, mt.getReturnType(), pt);
     }
     public void visitNewClass(JCNewClass tree) {
         if (tree.encl != null)
             tree.encl = translate(tree.encl, erasure(tree.encl.type));
         tree.clazz = translate(tree.clazz, null);
         if (tree.varargsElement != null)
             tree.varargsElement = types.erasure(tree.varargsElement);
         tree.args = translateArgs(
             tree.args, tree.constructor.erasure(types).getParameterTypes(), tree.varargsElement);
         tree.def = translate(tree.def, null);
         tree.type = erasure(tree.type);
         result = tree;
     }
     public void visitNewArray(JCNewArray tree) {
         tree.elemtype = translate(tree.elemtype, null);
         translate(tree.dims, syms.intType);
         if (tree.type != null) {
             tree.elems = translate(tree.elems, erasure(types.elemtype(tree.type)));
             tree.type = erasure(tree.type);
         } else {
             tree.elems = translate(tree.elems, null);
         }
         result = tree;
     }
     @Override
     public void visitLambda(JCLambda tree) {
         Assert.error("Translation of lambda expression not supported yet");
     }
     @Override
     public void visitReference(JCMemberReference tree) {
         Assert.error("Translation of method reference not supported yet");
     }
     public void visitParens(JCParens tree) {
         tree.expr = translate(tree.expr, pt);
         tree.type = erasure(tree.type);
         result = tree;
     }
     public void visitAssign(JCAssign tree) {
         tree.lhs = translate(tree.lhs, null);
         tree.rhs = translate(tree.rhs, erasure(tree.lhs.type));
         tree.type = erasure(tree.type);
         result = tree;
     }
     public void visitAssignop(JCAssignOp tree) {
         tree.lhs = translate(tree.lhs, null);
         tree.rhs = translate(tree.rhs, tree.operator.type.getParameterTypes().tail.head);
         tree.type = erasure(tree.type);
         result = tree;
     }
     public void visitUnary(JCUnary tree) {
         tree.arg = translate(tree.arg, tree.operator.type.getParameterTypes().head);
         result = tree;
     }
     public void visitBinary(JCBinary tree) {
         tree.lhs = translate(tree.lhs, tree.operator.type.getParameterTypes().head);
         tree.rhs = translate(tree.rhs, tree.operator.type.getParameterTypes().tail.head);
         result = tree;
     }
     public void visitTypeCast(JCTypeCast tree) {
         tree.clazz = translate(tree.clazz, null);
         tree.type = erasure(tree.type);
         tree.expr = translate(tree.expr, tree.type);
         result = tree;
     }
     public void visitTypeTest(JCInstanceOf tree) {
         tree.expr = translate(tree.expr, null);
         tree.clazz = translate(tree.clazz, null);
         result = tree;
     }
     public void visitIndexed(JCArrayAccess tree) {
         tree.indexed = translate(tree.indexed, erasure(tree.indexed.type));
         tree.index = translate(tree.index, syms.intType);
         // Insert casts of indexed expressions as needed.
         result = retype(tree, types.elemtype(tree.indexed.type), pt);
     }
     // There ought to be nothing to rewrite here;
     // we don't generate code.
     public void visitAnnotation(JCAnnotation tree) {
         result = tree;
     }
     public void visitIdent(JCIdent tree) {
         Type et = tree.sym.erasure(types);
         // Map type variables to their bounds.
         if (tree.sym.kind == TYP && tree.sym.type.hasTag(TYPEVAR)) {
             result = make.at(tree.pos).Type(et);
         } else
         // Map constants expressions to themselves.
         if (tree.type.constValue() != null) {
             result = tree;
         }
         // Insert casts of variable uses as needed.
         else if (tree.sym.kind == VAR) {
             result = retype(tree, et, pt);
         }
         else {
             tree.type = erasure(tree.type);
             result = tree;
         }
     }
     public void visitSelect(JCFieldAccess tree) {
         Type t = tree.selected.type;
         while (t.hasTag(TYPEVAR))
             t = t.getUpperBound();
         if (t.isCompound()) {
             if ((tree.sym.flags() & IPROXY) != 0) {
                 tree.sym = ((MethodSymbol)tree.sym).
                     implemented((TypeSymbol)tree.sym.owner, types);
             }
             tree.selected = coerce(
                 translate(tree.selected, erasure(tree.selected.type)),
                 erasure(tree.sym.owner.type));
         } else
             tree.selected = translate(tree.selected, erasure(t));
         // Map constants expressions to themselves.
         if (tree.type.constValue() != null) {
             result = tree;
         }
         // Insert casts of variable uses as needed.
         else if (tree.sym.kind == VAR) {
             result = retype(tree, tree.sym.erasure(types), pt);
         }
         else {
             tree.type = erasure(tree.type);
             result = tree;
         }
     }
     public void visitTypeArray(JCArrayTypeTree tree) {
         tree.elemtype = translate(tree.elemtype, null);
         tree.type = erasure(tree.type);
         result = tree;
     }
     /** Visitor method for parameterized types.
      */
     public void visitTypeApply(JCTypeApply tree) {
         JCTree clazz = translate(tree.clazz, null);
         result = clazz;
     }
 /**************************************************************************
  * utility methods
  *************************************************************************/
     private Type erasure(Type t) {
         return types.erasure(t);
     }
     private boolean boundsRestricted(ClassSymbol c) {
         Type st = types.supertype(c.type);
         if (st.isParameterized()) {
             List<Type> actuals = st.allparams();
             List<Type> formals = st.tsym.type.allparams();
             while (!actuals.isEmpty() && !formals.isEmpty()) {
                 Type actual = actuals.head;
                 Type formal = formals.head;
                 if (!types.isSameType(types.erasure(actual),
                         types.erasure(formal)))
                     return true;
                 actuals = actuals.tail;
                 formals = formals.tail;
             }
         }
         return false;
     }
     private List<JCTree> addOverrideBridgesIfNeeded(DiagnosticPosition pos,
                                     final ClassSymbol c) {
         ListBuffer<JCTree> buf = ListBuffer.lb();
         if (c.isInterface() || !boundsRestricted(c))
             return buf.toList();
         Type t = types.supertype(c.type);
             Scope s = t.tsym.members();
             if (s.elems != null) {
                 for (Symbol sym : s.getElements(new NeedsOverridBridgeFilter(c))) {
                     MethodSymbol m = (MethodSymbol)sym;
                     MethodSymbol member = (MethodSymbol)m.asMemberOf(c.type, types);
                     MethodSymbol impl = m.implementation(c, types, false);
                     if ((impl == null || impl.owner != c) &&
                             !types.isSameType(member.erasure(types), m.erasure(types))) {
                         addOverrideBridges(pos, m, member, c, buf);
                     }
                 }
             }
         return buf.toList();
     }
     // where
         class NeedsOverridBridgeFilter implements Filter<Symbol> {
             ClassSymbol c;
             NeedsOverridBridgeFilter(ClassSymbol c) {
                 this.c = c;
             }
             public boolean accepts(Symbol s) {
                 return s.kind == MTH &&
                             !s.isConstructor() &&
                             s.isInheritedIn(c, types) &&
                             (s.flags() & FINAL) == 0 &&
                             (s.flags() & (SYNTHETIC | OVERRIDE_BRIDGE)) != SYNTHETIC;
             }
         }
     private void addOverrideBridges(DiagnosticPosition pos,
                                     MethodSymbol impl,
                                     MethodSymbol member,
                                     ClassSymbol c,
                                     ListBuffer<JCTree> bridges) {
         Type implErasure = impl.erasure(types);
         long flags = (impl.flags() & AccessFlags) | SYNTHETIC | BRIDGE | OVERRIDE_BRIDGE;
         member = new MethodSymbol(flags, member.name, member.type, c);
         JCMethodDecl md = make.MethodDef(member, null);
         JCExpression receiver = make.Super(types.supertype(c.type).tsym.erasure(types), c);
         Type calltype = erasure(impl.type.getReturnType());
         JCExpression call =
             make.Apply(null,
                        make.Select(receiver, impl).setType(calltype),
                        translateArgs(make.Idents(md.params),
                                      implErasure.getParameterTypes(), null))
             .setType(calltype);
         JCStatement stat = (member.getReturnType().hasTag(VOID))
             ? make.Exec(call)
             : make.Return(coerce(call, member.erasure(types).getReturnType()));
         md.body = make.Block(0, List.of(stat));
         c.members().enter(member);
         bridges.append(md);
     }
 /**************************************************************************
  * main method
  *************************************************************************/
     private Env<AttrContext> env;
     void translateClass(ClassSymbol c) {
         Type st = types.supertype(c.type);
         // process superclass before derived
         if (st.hasTag(CLASS))
             translateClass((ClassSymbol)st.tsym);
         Env<AttrContext> myEnv = enter.typeEnvs.remove(c);
         if (myEnv == null)
             return;
         Env<AttrContext> oldEnv = env;
         try {
             env = myEnv;
             // class has not been translated yet
             TreeMaker savedMake = make;
             Type savedPt = pt;
             make = make.forToplevel(env.toplevel);
             pt = null;
             try {
                 JCClassDecl tree = (JCClassDecl) env.tree;
                 tree.typarams = List.nil();
                 super.visitClassDef(tree);
                 make.at(tree.pos);
                 if (addBridges) {
                     ListBuffer<JCTree> bridges = new ListBuffer<JCTree>();
                     if (false) //see CR: 6996415
                         bridges.appendList(addOverrideBridgesIfNeeded(tree, c));
                     if ((tree.sym.flags() & INTERFACE) == 0)
                         addBridges(tree.pos(), tree.sym, bridges);
                     tree.defs = bridges.toList().prependList(tree.defs);
                 }
                 tree.type = erasure(tree.type);
             } finally {
                 make = savedMake;
                 pt = savedPt;
             }
         } finally {
             env = oldEnv;
         }
     }
     /** Translate a toplevel class definition.
      *  @param cdef    The definition to be translated.
      */
     public JCTree translateTopLevelClass(JCTree cdef, TreeMaker make) {
         // note that this method does NOT support recursion.
         this.make = make;
         pt = null;
         return translate(cdef, null);
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/comp/TransTypes.java@c002fdee76fd (annotated)

src/share/classes/com/sun/tools/javac/comp/TransTypes.java