jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/comp/LambdaToMethod.java@05ec778794d0 (annotated)

src/share/classes/com/sun/tools/javac/comp/LambdaToMethod.java@05ec778794d0 (annotated)

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

Wed, 15 May 2013 14:00:31 +0100

author: mcimadamore
date: Wed, 15 May 2013 14:00:31 +0100
changeset 1759: 05ec778794d0
parent 1755: ddb4a2bfcd82
child 1762: 31ef33db5e0e
permissions: -rw-r--r--

8012003: Method diagnostics resolution need to be simplified in some cases
Summary: Unfold method resolution diagnostics when they mention errors in poly expressions
Reviewed-by: jjg, vromero

 /*
  * Copyright (c) 2010, 2013, 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 com.sun.tools.javac.tree.*;
 import com.sun.tools.javac.tree.JCTree.*;
 import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind;
 import com.sun.tools.javac.tree.TreeMaker;
 import com.sun.tools.javac.tree.TreeScanner;
 import com.sun.tools.javac.tree.TreeTranslator;
 import com.sun.tools.javac.code.Attribute;
 import com.sun.tools.javac.code.Kinds;
 import com.sun.tools.javac.code.Scope;
 import com.sun.tools.javac.code.Symbol;
 import com.sun.tools.javac.code.Symbol.ClassSymbol;
 import com.sun.tools.javac.code.Symbol.DynamicMethodSymbol;
 import com.sun.tools.javac.code.Symbol.MethodSymbol;
 import com.sun.tools.javac.code.Symbol.VarSymbol;
 import com.sun.tools.javac.code.Symtab;
 import com.sun.tools.javac.code.Type;
 import com.sun.tools.javac.code.Type.MethodType;
 import com.sun.tools.javac.code.Types;
 import com.sun.tools.javac.comp.LambdaToMethod.LambdaAnalyzerPreprocessor.*;
 import com.sun.tools.javac.comp.Lower.BasicFreeVarCollector;
 import com.sun.tools.javac.jvm.*;
 import com.sun.tools.javac.util.*;
 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import static com.sun.tools.javac.comp.LambdaToMethod.LambdaSymbolKind.*;
 import static com.sun.tools.javac.code.Flags.*;
 import static com.sun.tools.javac.code.Kinds.*;
 import static com.sun.tools.javac.code.TypeTag.*;
 import static com.sun.tools.javac.tree.JCTree.Tag.*;
 /**
  * This pass desugars lambda expressions into static methods
  *
  *  <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 LambdaToMethod extends TreeTranslator {
     private Lower lower;
     private Names names;
     private Symtab syms;
     private Resolve rs;
     private TreeMaker make;
     private Types types;
     private TransTypes transTypes;
     private Env<AttrContext> attrEnv;
     /** the analyzer scanner */
     private LambdaAnalyzerPreprocessor analyzer;
     /** map from lambda trees to translation contexts */
     private Map<JCTree, TranslationContext<?>> contextMap;
     /** current translation context (visitor argument) */
     private TranslationContext<?> context;
     /** info about the current class being processed */
     private KlassInfo kInfo;
     /** Flag for alternate metafactories indicating the lambda object is intended to be serializable */
     public static final int FLAG_SERIALIZABLE = 1 << 0;
     /** Flag for alternate metafactories indicating the lambda object has multiple targets */
     public static final int FLAG_MARKERS = 1 << 1;
     private class KlassInfo {
         /**
          * list of methods to append
          */
         private ListBuffer<JCTree> appendedMethodList;
         /**
          * list of deserialization cases
          */
         private final Map<String, ListBuffer<JCStatement>> deserializeCases;
        /**
          * deserialize method symbol
          */
         private final MethodSymbol deserMethodSym;
         /**
          * deserialize method parameter symbol
          */
         private final VarSymbol deserParamSym;
         private KlassInfo(Symbol kSym) {
             appendedMethodList = ListBuffer.lb();
             deserializeCases = new HashMap<String, ListBuffer<JCStatement>>();
             long flags = PRIVATE | STATIC | SYNTHETIC;
             MethodType type = new MethodType(List.of(syms.serializedLambdaType), syms.objectType,
                     List.<Type>nil(), syms.methodClass);
             deserMethodSym = makeSyntheticMethod(flags, names.deserializeLambda, type, kSym);
             deserParamSym = new VarSymbol(FINAL, names.fromString("lambda"),
                     syms.serializedLambdaType, deserMethodSym);
         }
         private void addMethod(JCTree decl) {
             appendedMethodList = appendedMethodList.prepend(decl);
         }
     }
     // <editor-fold defaultstate="collapsed" desc="Instantiating">
     private static final Context.Key<LambdaToMethod> unlambdaKey =
             new Context.Key<LambdaToMethod>();
     public static LambdaToMethod instance(Context context) {
         LambdaToMethod instance = context.get(unlambdaKey);
         if (instance == null) {
             instance = new LambdaToMethod(context);
         }
         return instance;
     }
     private LambdaToMethod(Context context) {
         lower = Lower.instance(context);
         names = Names.instance(context);
         syms = Symtab.instance(context);
         rs = Resolve.instance(context);
         make = TreeMaker.instance(context);
         types = Types.instance(context);
         transTypes = TransTypes.instance(context);
         analyzer = new LambdaAnalyzerPreprocessor();
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="translate methods">
     @Override
     public <T extends JCTree> T translate(T tree) {
         TranslationContext<?> newContext = contextMap.get(tree);
         return translate(tree, newContext != null ? newContext : context);
     }
     public <T extends JCTree> T translate(T tree, TranslationContext<?> newContext) {
         TranslationContext<?> prevContext = context;
         try {
             context = newContext;
             return super.translate(tree);
         }
         finally {
             context = prevContext;
         }
     }
     public <T extends JCTree> List<T> translate(List<T> trees, TranslationContext<?> newContext) {
         ListBuffer<T> buf = ListBuffer.lb();
         for (T tree : trees) {
             buf.append(translate(tree, newContext));
         }
         return buf.toList();
     }
     public JCTree translateTopLevelClass(Env<AttrContext> env, JCTree cdef, TreeMaker make) {
         this.make = make;
         this.attrEnv = env;
         this.context = null;
         this.contextMap = new HashMap<JCTree, TranslationContext<?>>();
         return translate(cdef);
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="visitor methods">
     /**
      * Visit a class.
      * Maintain the translatedMethodList across nested classes.
      * Append the translatedMethodList to the class after it is translated.
      * @param tree
      */
     @Override
     public void visitClassDef(JCClassDecl tree) {
         if (tree.sym.owner.kind == PCK) {
             //analyze class
             tree = analyzer.analyzeAndPreprocessClass(tree);
         }
         KlassInfo prevKlassInfo = kInfo;
         try {
             kInfo = new KlassInfo(tree.sym);
             super.visitClassDef(tree);
             if (!kInfo.deserializeCases.isEmpty()) {
                 kInfo.addMethod(makeDeserializeMethod(tree.sym));
             }
             //add all translated instance methods here
             List<JCTree> newMethods = kInfo.appendedMethodList.toList();
             tree.defs = tree.defs.appendList(newMethods);
             for (JCTree lambda : newMethods) {
                 tree.sym.members().enter(((JCMethodDecl)lambda).sym);
             }
             result = tree;
         } finally {
             kInfo = prevKlassInfo;
         }
     }
     /**
      * Translate a lambda into a method to be inserted into the class.
      * Then replace the lambda site with an invokedynamic call of to lambda
      * meta-factory, which will use the lambda method.
      * @param tree
      */
     @Override
     public void visitLambda(JCLambda tree) {
         LambdaTranslationContext localContext = (LambdaTranslationContext)context;
         MethodSymbol sym = (MethodSymbol)localContext.translatedSym;
         MethodType lambdaType = (MethodType) sym.type;
         {
             MethodSymbol owner = (MethodSymbol) localContext.owner;
             ListBuffer<Attribute.TypeCompound> ownerTypeAnnos = new ListBuffer<Attribute.TypeCompound>();
             ListBuffer<Attribute.TypeCompound> lambdaTypeAnnos = new ListBuffer<Attribute.TypeCompound>();
             for (Attribute.TypeCompound tc : owner.getRawTypeAttributes()) {
                 if (tc.position.onLambda == tree) {
                     lambdaTypeAnnos.append(tc);
                 } else {
                     ownerTypeAnnos.append(tc);
                 }
             }
             if (lambdaTypeAnnos.nonEmpty()) {
                 owner.annotations.setTypeAttributes(ownerTypeAnnos.toList());
                 sym.annotations.setTypeAttributes(lambdaTypeAnnos.toList());
             }
         }
         //create the method declaration hoisting the lambda body
         JCMethodDecl lambdaDecl = make.MethodDef(make.Modifiers(sym.flags_field),
                 sym.name,
                 make.QualIdent(lambdaType.getReturnType().tsym),
                 List.<JCTypeParameter>nil(),
                 localContext.syntheticParams,
                 lambdaType.getThrownTypes() == null ?
                     List.<JCExpression>nil() :
                     make.Types(lambdaType.getThrownTypes()),
                 null,
                 null);
         lambdaDecl.sym = sym;
         lambdaDecl.type = lambdaType;
         //translate lambda body
         //As the lambda body is translated, all references to lambda locals,
         //captured variables, enclosing members are adjusted accordingly
         //to refer to the static method parameters (rather than i.e. acessing to
         //captured members directly).
         lambdaDecl.body = translate(makeLambdaBody(tree, lambdaDecl));
         //Add the method to the list of methods to be added to this class.
         kInfo.addMethod(lambdaDecl);
         //now that we have generated a method for the lambda expression,
         //we can translate the lambda into a method reference pointing to the newly
         //created method.
         //
         //Note that we need to adjust the method handle so that it will match the
         //signature of the SAM descriptor - this means that the method reference
         //should be added the following synthetic arguments:
         //
         // * the "this" argument if it is an instance method
         // * enclosing locals captured by the lambda expression
         ListBuffer<JCExpression> syntheticInits = ListBuffer.lb();
         if (!sym.isStatic()) {
             syntheticInits.append(makeThis(
                     sym.owner.enclClass().asType(),
                     localContext.owner.enclClass()));
         }
         //add captured locals
         for (Symbol fv : localContext.getSymbolMap(CAPTURED_VAR).keySet()) {
             if (fv != localContext.self) {
                 JCTree captured_local = make.Ident(fv).setType(fv.type);
                 syntheticInits.append((JCExpression) captured_local);
             }
         }
         //then, determine the arguments to the indy call
         List<JCExpression> indy_args = translate(syntheticInits.toList(), localContext.prev);
         //build a sam instance using an indy call to the meta-factory
         int refKind = referenceKind(sym);
         //convert to an invokedynamic call
         result = makeMetaFactoryIndyCall(tree, context.needsAltMetafactory(), context.isSerializable(), refKind, sym, indy_args);
     }
     private JCIdent makeThis(Type type, Symbol owner) {
         VarSymbol _this = new VarSymbol(PARAMETER | FINAL | SYNTHETIC,
                 names._this,
                 type,
                 owner);
         return make.Ident(_this);
     }
     /**
      * Translate a method reference into an invokedynamic call to the
      * meta-factory.
      * @param tree
      */
     @Override
     public void visitReference(JCMemberReference tree) {
         ReferenceTranslationContext localContext = (ReferenceTranslationContext)context;
         //first determine the method symbol to be used to generate the sam instance
         //this is either the method reference symbol, or the bridged reference symbol
         Symbol refSym = localContext.needsBridge() ?
             localContext.bridgeSym :
             tree.sym;
         //build the bridge method, if needed
         if (localContext.needsBridge()) {
             bridgeMemberReference(tree, localContext);
         }
         //the qualifying expression is treated as a special captured arg
         JCExpression init;
         switch(tree.kind) {
             case IMPLICIT_INNER:    /** Inner :: new */
             case SUPER:             /** super :: instMethod */
                 init = makeThis(
                     localContext.owner.enclClass().asType(),
                     localContext.owner.enclClass());
                 break;
             case BOUND:             /** Expr :: instMethod */
                 init = tree.getQualifierExpression();
                 break;
             case UNBOUND:           /** Type :: instMethod */
             case STATIC:            /** Type :: staticMethod */
             case TOPLEVEL:          /** Top level :: new */
             case ARRAY_CTOR:        /** ArrayType :: new */
                 init = null;
                 break;
             default:
                 throw new InternalError("Should not have an invalid kind");
         }
         List<JCExpression> indy_args = init==null? List.<JCExpression>nil() : translate(List.of(init), localContext.prev);
         //build a sam instance using an indy call to the meta-factory
         result = makeMetaFactoryIndyCall(tree, localContext.needsAltMetafactory(), localContext.isSerializable(), localContext.referenceKind(), refSym, indy_args);
     }
     /**
      * Translate identifiers within a lambda to the mapped identifier
      * @param tree
      */
     @Override
     public void visitIdent(JCIdent tree) {
         if (context == null || !analyzer.lambdaIdentSymbolFilter(tree.sym)) {
             super.visitIdent(tree);
         } else {
             LambdaTranslationContext lambdaContext = (LambdaTranslationContext) context;
             if (lambdaContext.getSymbolMap(PARAM).containsKey(tree.sym)) {
                 Symbol translatedSym = lambdaContext.getSymbolMap(PARAM).get(tree.sym);
                 result = make.Ident(translatedSym).setType(tree.type);
                 translatedSym.annotations.setTypeAttributes(tree.sym.getRawTypeAttributes());
             } else if (lambdaContext.getSymbolMap(LOCAL_VAR).containsKey(tree.sym)) {
                 Symbol translatedSym = lambdaContext.getSymbolMap(LOCAL_VAR).get(tree.sym);
                 result = make.Ident(translatedSym).setType(tree.type);
                 translatedSym.annotations.setTypeAttributes(tree.sym.getRawTypeAttributes());
             } else if (lambdaContext.getSymbolMap(TYPE_VAR).containsKey(tree.sym)) {
                 Symbol translatedSym = lambdaContext.getSymbolMap(TYPE_VAR).get(tree.sym);
                 result = make.Ident(translatedSym).setType(translatedSym.type);
                 translatedSym.annotations.setTypeAttributes(tree.sym.getRawTypeAttributes());
             } else if (lambdaContext.getSymbolMap(CAPTURED_VAR).containsKey(tree.sym)) {
                 Symbol translatedSym = lambdaContext.getSymbolMap(CAPTURED_VAR).get(tree.sym);
                 result = make.Ident(translatedSym).setType(tree.type);
             } else {
                 //access to untranslated symbols (i.e. compile-time constants,
                 //members defined inside the lambda body, etc.) )
                 super.visitIdent(tree);
             }
         }
     }
     @Override
     public void visitVarDef(JCVariableDecl tree) {
         LambdaTranslationContext lambdaContext = (LambdaTranslationContext)context;
         if (context != null && lambdaContext.getSymbolMap(LOCAL_VAR).containsKey(tree.sym)) {
             JCExpression init = translate(tree.init);
             result = make.VarDef((VarSymbol)lambdaContext.getSymbolMap(LOCAL_VAR).get(tree.sym), init);
         } else if (context != null && lambdaContext.getSymbolMap(TYPE_VAR).containsKey(tree.sym)) {
             JCExpression init = translate(tree.init);
             VarSymbol xsym = (VarSymbol)lambdaContext.getSymbolMap(TYPE_VAR).get(tree.sym);
             result = make.VarDef(xsym, init);
             // Replace the entered symbol for this variable
             Scope sc = tree.sym.owner.members();
             if (sc != null) {
                 sc.remove(tree.sym);
                 sc.enter(xsym);
             }
         } else {
             super.visitVarDef(tree);
         }
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="Translation helper methods">
     private JCBlock makeLambdaBody(JCLambda tree, JCMethodDecl lambdaMethodDecl) {
         return tree.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
                 makeLambdaExpressionBody((JCExpression)tree.body, lambdaMethodDecl) :
                 makeLambdaStatementBody((JCBlock)tree.body, lambdaMethodDecl, tree.canCompleteNormally);
     }
     private JCBlock makeLambdaExpressionBody(JCExpression expr, JCMethodDecl lambdaMethodDecl) {
         Type restype = lambdaMethodDecl.type.getReturnType();
         boolean isLambda_void = expr.type.hasTag(VOID);
         boolean isTarget_void = restype.hasTag(VOID);
         boolean isTarget_Void = types.isSameType(restype, types.boxedClass(syms.voidType).type);
         if (isTarget_void) {
             //target is void:
             // BODY;
             JCStatement stat = make.Exec(expr);
             return make.Block(0, List.<JCStatement>of(stat));
         } else if (isLambda_void && isTarget_Void) {
             //void to Void conversion:
             // BODY; return null;
             ListBuffer<JCStatement> stats = ListBuffer.lb();
             stats.append(make.Exec(expr));
             stats.append(make.Return(make.Literal(BOT, null).setType(syms.botType)));
             return make.Block(0, stats.toList());
         } else {
             //non-void to non-void conversion:
             // return (TYPE)BODY;
             JCExpression retExpr = transTypes.coerce(attrEnv, expr, restype);
             return make.Block(0, List.<JCStatement>of(make.Return(retExpr)));
         }
     }
     private JCBlock makeLambdaStatementBody(JCBlock block, final JCMethodDecl lambdaMethodDecl, boolean completeNormally) {
         final Type restype = lambdaMethodDecl.type.getReturnType();
         final boolean isTarget_void = restype.hasTag(VOID);
         boolean isTarget_Void = types.isSameType(restype, types.boxedClass(syms.voidType).type);
         class LambdaBodyTranslator extends TreeTranslator {
             @Override
             public void visitClassDef(JCClassDecl tree) {
                 //do NOT recurse on any inner classes
                 result = tree;
             }
             @Override
             public void visitLambda(JCLambda tree) {
                 //do NOT recurse on any nested lambdas
                 result = tree;
             }
             @Override
             public void visitReturn(JCReturn tree) {
                 boolean isLambda_void = tree.expr == null;
                 if (isTarget_void && !isLambda_void) {
                     //Void to void conversion:
                     // { TYPE $loc = RET-EXPR; return; }
                     VarSymbol loc = makeSyntheticVar(0, names.fromString("$loc"), tree.expr.type, lambdaMethodDecl.sym);
                     JCVariableDecl varDef = make.VarDef(loc, tree.expr);
                     result = make.Block(0, List.<JCStatement>of(varDef, make.Return(null)));
                 } else if (!isTarget_void || !isLambda_void) {
                     //non-void to non-void conversion:
                     // return (TYPE)RET-EXPR;
                     tree.expr = transTypes.coerce(attrEnv, tree.expr, restype);
                     result = tree;
                 } else {
                     result = tree;
                 }
             }
         }
         JCBlock trans_block = new LambdaBodyTranslator().translate(block);
         if (completeNormally && isTarget_Void) {
             //there's no return statement and the lambda (possibly inferred)
             //return type is java.lang.Void; emit a synthetic return statement
             trans_block.stats = trans_block.stats.append(make.Return(make.Literal(BOT, null).setType(syms.botType)));
         }
         return trans_block;
     }
     private JCMethodDecl makeDeserializeMethod(Symbol kSym) {
         ListBuffer<JCCase> cases = ListBuffer.lb();
         ListBuffer<JCBreak> breaks = ListBuffer.lb();
         for (Map.Entry<String, ListBuffer<JCStatement>> entry : kInfo.deserializeCases.entrySet()) {
             JCBreak br = make.Break(null);
             breaks.add(br);
             List<JCStatement> stmts = entry.getValue().append(br).toList();
             cases.add(make.Case(make.Literal(entry.getKey()), stmts));
         }
         JCSwitch sw = make.Switch(deserGetter("getImplMethodName", syms.stringType), cases.toList());
         for (JCBreak br : breaks) {
             br.target = sw;
         }
         JCBlock body = make.Block(0L, List.<JCStatement>of(
                 sw,
                 make.Throw(makeNewClass(
                     syms.illegalArgumentExceptionType,
                     List.<JCExpression>of(make.Literal("Invalid lambda deserialization"))))));
         JCMethodDecl deser = make.MethodDef(make.Modifiers(kInfo.deserMethodSym.flags()),
                         names.deserializeLambda,
                         make.QualIdent(kInfo.deserMethodSym.getReturnType().tsym),
                         List.<JCTypeParameter>nil(),
                         List.of(make.VarDef(kInfo.deserParamSym, null)),
                         List.<JCExpression>nil(),
                         body,
                         null);
         deser.sym = kInfo.deserMethodSym;
         deser.type = kInfo.deserMethodSym.type;
         //System.err.printf("DESER: '%s'\n", deser);
         return deser;
     }
     /** Make an attributed class instance creation expression.
      *  @param ctype    The class type.
      *  @param args     The constructor arguments.
      *  @param cons     The constructor symbol
      */
     JCNewClass makeNewClass(Type ctype, List<JCExpression> args, Symbol cons) {
         JCNewClass tree = make.NewClass(null,
             null, make.QualIdent(ctype.tsym), args, null);
         tree.constructor = cons;
         tree.type = ctype;
         return tree;
     }
     /** Make an attributed class instance creation expression.
      *  @param ctype    The class type.
      *  @param args     The constructor arguments.
      */
     JCNewClass makeNewClass(Type ctype, List<JCExpression> args) {
         return makeNewClass(ctype, args,
                 rs.resolveConstructor(null, attrEnv, ctype, TreeInfo.types(args), List.<Type>nil()));
      }
     private void addDeserializationCase(int implMethodKind, Symbol refSym, Type targetType, MethodSymbol samSym,
             DiagnosticPosition pos, List<Object> staticArgs, MethodType indyType) {
         String functionalInterfaceClass = classSig(targetType);
         String functionalInterfaceMethodName = samSym.getSimpleName().toString();
         String functionalInterfaceMethodSignature = methodSig(types.erasure(samSym.type));
         String implClass = classSig(types.erasure(refSym.owner.type));
         String implMethodName = refSym.getQualifiedName().toString();
         String implMethodSignature = methodSig(types.erasure(refSym.type));
         JCExpression kindTest = eqTest(syms.intType, deserGetter("getImplMethodKind", syms.intType), make.Literal(implMethodKind));
         ListBuffer<JCExpression> serArgs = ListBuffer.lb();
         int i = 0;
         for (Type t : indyType.getParameterTypes()) {
             List<JCExpression> indexAsArg = ListBuffer.<JCExpression>lb().append(make.Literal(i)).toList();
             List<Type> argTypes = ListBuffer.<Type>lb().append(syms.intType).toList();
             serArgs.add(make.TypeCast(types.erasure(t), deserGetter("getCapturedArg", syms.objectType, argTypes, indexAsArg)));
             ++i;
         }
         JCStatement stmt = make.If(
                 deserTest(deserTest(deserTest(deserTest(deserTest(
                     kindTest,
                     "getFunctionalInterfaceClass", functionalInterfaceClass),
                     "getFunctionalInterfaceMethodName", functionalInterfaceMethodName),
                     "getFunctionalInterfaceMethodSignature", functionalInterfaceMethodSignature),
                     "getImplClass", implClass),
                     "getImplMethodSignature", implMethodSignature),
                 make.Return(makeIndyCall(
                     pos,
                     syms.lambdaMetafactory,
                     names.altMetaFactory,
                     staticArgs, indyType, serArgs.toList())),
                 null);
         ListBuffer<JCStatement> stmts = kInfo.deserializeCases.get(implMethodName);
         if (stmts == null) {
             stmts = ListBuffer.lb();
             kInfo.deserializeCases.put(implMethodName, stmts);
         }
         /****
         System.err.printf("+++++++++++++++++\n");
         System.err.printf("*functionalInterfaceClass: '%s'\n", functionalInterfaceClass);
         System.err.printf("*functionalInterfaceMethodName: '%s'\n", functionalInterfaceMethodName);
         System.err.printf("*functionalInterfaceMethodSignature: '%s'\n", functionalInterfaceMethodSignature);
         System.err.printf("*implMethodKind: %d\n", implMethodKind);
         System.err.printf("*implClass: '%s'\n", implClass);
         System.err.printf("*implMethodName: '%s'\n", implMethodName);
         System.err.printf("*implMethodSignature: '%s'\n", implMethodSignature);
         ****/
         stmts.append(stmt);
     }
     private JCExpression eqTest(Type argType, JCExpression arg1, JCExpression arg2) {
         JCBinary testExpr = make.Binary(JCTree.Tag.EQ, arg1, arg2);
         testExpr.operator = rs.resolveBinaryOperator(null, JCTree.Tag.EQ, attrEnv, argType, argType);
         testExpr.setType(syms.booleanType);
         return testExpr;
     }
     private JCExpression deserTest(JCExpression prev, String func, String lit) {
         MethodType eqmt = new MethodType(List.of(syms.objectType), syms.booleanType, List.<Type>nil(), syms.methodClass);
         Symbol eqsym = rs.resolveQualifiedMethod(null, attrEnv, syms.objectType, names.equals, List.of(syms.objectType), List.<Type>nil());
         JCMethodInvocation eqtest = make.Apply(
                 List.<JCExpression>nil(),
                 make.Select(deserGetter(func, syms.stringType), eqsym).setType(eqmt),
                 List.<JCExpression>of(make.Literal(lit)));
         eqtest.setType(syms.booleanType);
         JCBinary compound = make.Binary(JCTree.Tag.AND, prev, eqtest);
         compound.operator = rs.resolveBinaryOperator(null, JCTree.Tag.AND, attrEnv, syms.booleanType, syms.booleanType);
         compound.setType(syms.booleanType);
         return compound;
     }
     private JCExpression deserGetter(String func, Type type) {
         return deserGetter(func, type, List.<Type>nil(), List.<JCExpression>nil());
     }
     private JCExpression deserGetter(String func, Type type, List<Type> argTypes, List<JCExpression> args) {
         MethodType getmt = new MethodType(argTypes, type, List.<Type>nil(), syms.methodClass);
         Symbol getsym = rs.resolveQualifiedMethod(null, attrEnv, syms.serializedLambdaType, names.fromString(func), argTypes, List.<Type>nil());
         return make.Apply(
                     List.<JCExpression>nil(),
                     make.Select(make.Ident(kInfo.deserParamSym).setType(syms.serializedLambdaType), getsym).setType(getmt),
                     args).setType(type);
     }
     /**
      * Create new synthetic method with given flags, name, type, owner
      */
     private MethodSymbol makeSyntheticMethod(long flags, Name name, Type type, Symbol owner) {
         return new MethodSymbol(flags | SYNTHETIC, name, type, owner);
     }
     /**
      * Create new synthetic variable with given flags, name, type, owner
      */
     private VarSymbol makeSyntheticVar(long flags, String name, Type type, Symbol owner) {
         return makeSyntheticVar(flags, names.fromString(name), type, owner);
     }
     /**
      * Create new synthetic variable with given flags, name, type, owner
      */
     private VarSymbol makeSyntheticVar(long flags, Name name, Type type, Symbol owner) {
         return new VarSymbol(flags | SYNTHETIC, name, type, owner);
     }
     /**
      * Set varargsElement field on a given tree (must be either a new class tree
      * or a method call tree)
      */
     private void setVarargsIfNeeded(JCTree tree, Type varargsElement) {
         if (varargsElement != null) {
             switch (tree.getTag()) {
                 case APPLY: ((JCMethodInvocation)tree).varargsElement = varargsElement; break;
                 case NEWCLASS: ((JCNewClass)tree).varargsElement = varargsElement; break;
                 default: throw new AssertionError();
             }
         }
     }
     /**
      * Convert method/constructor arguments by inserting appropriate cast
      * as required by type-erasure - this is needed when bridging a lambda/method
      * reference, as the bridged signature might require downcast to be compatible
      * with the generated signature.
      */
     private List<JCExpression> convertArgs(Symbol meth, List<JCExpression> args, Type varargsElement) {
        Assert.check(meth.kind == Kinds.MTH);
        List<Type> formals = types.erasure(meth.type).getParameterTypes();
        if (varargsElement != null) {
            Assert.check((meth.flags() & VARARGS) != 0);
        }
        return transTypes.translateArgs(args, formals, varargsElement, attrEnv);
     }
     // </editor-fold>
     /**
      * Generate an adapter method "bridge" for a method reference which cannot
      * be used directly.
      */
     private class MemberReferenceBridger {
         private final JCMemberReference tree;
         private final ReferenceTranslationContext localContext;
         private final ListBuffer<JCExpression> args = ListBuffer.lb();
         private final ListBuffer<JCVariableDecl> params = ListBuffer.lb();
         MemberReferenceBridger(JCMemberReference tree, ReferenceTranslationContext localContext) {
             this.tree = tree;
             this.localContext = localContext;
         }
         /**
          * Generate the bridge
          */
         JCMethodDecl bridge() {
             int prevPos = make.pos;
             try {
                 make.at(tree);
                 Type samDesc = localContext.bridgedRefSig();
                 List<Type> samPTypes = samDesc.getParameterTypes();
                 //an extra argument is prepended to the signature of the bridge in case
                 //the member reference is an instance method reference (in which case
                 //the receiver expression is passed to the bridge itself).
                 Type recType = null;
                 switch (tree.kind) {
                     case IMPLICIT_INNER:
                         recType = tree.sym.owner.type.getEnclosingType();
                         break;
                     case BOUND:
                         recType = tree.getQualifierExpression().type;
                         break;
                     case UNBOUND:
                         recType = samPTypes.head;
                         samPTypes = samPTypes.tail;
                         break;
                 }
                 //generate the parameter list for the bridged member reference - the
                 //bridge signature will match the signature of the target sam descriptor
                 VarSymbol rcvr = (recType == null)
                         ? null
                         : addParameter("rec$", recType, false);
                 List<Type> refPTypes = tree.sym.type.getParameterTypes();
                 int refSize = refPTypes.size();
                 int samSize = samPTypes.size();
                 // Last parameter to copy from referenced method
                 int last = localContext.needsVarArgsConversion() ? refSize - 1 : refSize;
                 List<Type> l = refPTypes;
                 // Use parameter types of the referenced method, excluding final var args
                 for (int i = 0; l.nonEmpty() && i < last; ++i) {
                     addParameter("x$" + i, l.head, true);
                     l = l.tail;
                 }
                 // Flatten out the var args
                 for (int i = last; i < samSize; ++i) {
                     addParameter("xva$" + i, tree.varargsElement, true);
                 }
                 //generate the bridge method declaration
                 JCMethodDecl bridgeDecl = make.MethodDef(make.Modifiers(localContext.bridgeSym.flags()),
                         localContext.bridgeSym.name,
                         make.QualIdent(samDesc.getReturnType().tsym),
                         List.<JCTypeParameter>nil(),
                         params.toList(),
                         tree.sym.type.getThrownTypes() == null
                         ? List.<JCExpression>nil()
                         : make.Types(tree.sym.type.getThrownTypes()),
                         null,
                         null);
                 bridgeDecl.sym = (MethodSymbol) localContext.bridgeSym;
                 bridgeDecl.type = localContext.bridgeSym.type =
                         types.createMethodTypeWithParameters(samDesc, TreeInfo.types(params.toList()));
                 //bridge method body generation - this can be either a method call or a
                 //new instance creation expression, depending on the member reference kind
                 JCExpression bridgeExpr = (tree.getMode() == ReferenceMode.INVOKE)
                         ? bridgeExpressionInvoke(makeReceiver(rcvr))
                         : bridgeExpressionNew();
                 //the body is either a return expression containing a method call,
                 //or the method call itself, depending on whether the return type of
                 //the bridge is non-void/void.
                 bridgeDecl.body = makeLambdaExpressionBody(bridgeExpr, bridgeDecl);
                 return bridgeDecl;
             } finally {
                 make.at(prevPos);
             }
         }
         //where
             private JCExpression makeReceiver(VarSymbol rcvr) {
                 if (rcvr == null) return null;
                 JCExpression rcvrExpr = make.Ident(rcvr);
                 Type rcvrType = tree.sym.enclClass().type;
                 if (!rcvr.type.tsym.isSubClass(rcvrType.tsym, types)) {
                     rcvrExpr = make.TypeCast(make.Type(rcvrType), rcvrExpr).setType(rcvrType);
                 }
                 return rcvrExpr;
             }
         /**
          * determine the receiver of the bridged method call - the receiver can
          * be either the synthetic receiver parameter or a type qualifier; the
          * original qualifier expression is never used here, as it might refer
          * to symbols not available in the static context of the bridge
          */
         private JCExpression bridgeExpressionInvoke(JCExpression rcvr) {
             JCExpression qualifier =
                     tree.sym.isStatic() ?
                         make.Type(tree.sym.owner.type) :
                         (rcvr != null) ?
                             rcvr :
                             tree.getQualifierExpression();
             //create the qualifier expression
             JCFieldAccess select = make.Select(qualifier, tree.sym.name);
             select.sym = tree.sym;
             select.type = tree.sym.erasure(types);
             //create the method call expression
             JCExpression apply = make.Apply(List.<JCExpression>nil(), select,
                     convertArgs(tree.sym, args.toList(), tree.varargsElement)).
                     setType(tree.sym.erasure(types).getReturnType());
             apply = transTypes.coerce(apply, localContext.generatedRefSig().getReturnType());
             setVarargsIfNeeded(apply, tree.varargsElement);
             return apply;
         }
         /**
          * the enclosing expression is either 'null' (no enclosing type) or set
          * to the first bridge synthetic parameter
          */
         private JCExpression bridgeExpressionNew() {
             if (tree.kind == ReferenceKind.ARRAY_CTOR) {
                 //create the array creation expression
                 JCNewArray newArr = make.NewArray(
                         make.Type(types.elemtype(tree.getQualifierExpression().type)),
                         List.of(make.Ident(params.first())),
                         null);
                 newArr.type = tree.getQualifierExpression().type;
                 return newArr;
             } else {
                 JCExpression encl = null;
                 switch (tree.kind) {
                     case UNBOUND:
                     case IMPLICIT_INNER:
                         encl = make.Ident(params.first());
                 }
                 //create the instance creation expression
                 JCNewClass newClass = make.NewClass(encl,
                         List.<JCExpression>nil(),
                         make.Type(tree.getQualifierExpression().type),
                         convertArgs(tree.sym, args.toList(), tree.varargsElement),
                         null);
                 newClass.constructor = tree.sym;
                 newClass.constructorType = tree.sym.erasure(types);
                 newClass.type = tree.getQualifierExpression().type;
                 setVarargsIfNeeded(newClass, tree.varargsElement);
                 return newClass;
             }
         }
         private VarSymbol addParameter(String name, Type p, boolean genArg) {
             VarSymbol vsym = new VarSymbol(0, names.fromString(name), p, localContext.bridgeSym);
             params.append(make.VarDef(vsym, null));
             if (genArg) {
                 args.append(make.Ident(vsym));
             }
             return vsym;
         }
     }
     /**
      * Bridges a member reference - this is needed when:
      * * Var args in the referenced method need to be flattened away
      * * super is used
      */
     private void bridgeMemberReference(JCMemberReference tree, ReferenceTranslationContext localContext) {
         kInfo.addMethod(new MemberReferenceBridger(tree, localContext).bridge());
     }
     /**
      * Generate an indy method call to the meta factory
      */
     private JCExpression makeMetaFactoryIndyCall(JCFunctionalExpression tree, boolean needsAltMetafactory,
             boolean isSerializable, int refKind, Symbol refSym, List<JCExpression> indy_args) {
         //determine the static bsm args
         Type mtype = types.erasure(tree.descriptorType);
         MethodSymbol samSym = (MethodSymbol) types.findDescriptorSymbol(tree.type.tsym);
         List<Object> staticArgs = List.<Object>of(
                 new Pool.MethodHandle(ClassFile.REF_invokeInterface,
                     types.findDescriptorSymbol(tree.type.tsym), types),
                 new Pool.MethodHandle(refKind, refSym, types),
                 new MethodType(mtype.getParameterTypes(),
                         mtype.getReturnType(),
                         mtype.getThrownTypes(),
                         syms.methodClass));
         //computed indy arg types
         ListBuffer<Type> indy_args_types = ListBuffer.lb();
         for (JCExpression arg : indy_args) {
             indy_args_types.append(arg.type);
         }
         //finally, compute the type of the indy call
         MethodType indyType = new MethodType(indy_args_types.toList(),
                 tree.type,
                 List.<Type>nil(),
                 syms.methodClass);
         Name metafactoryName = needsAltMetafactory ?
                 names.altMetaFactory : names.metaFactory;
         if (needsAltMetafactory) {
             ListBuffer<Object> markers = ListBuffer.lb();
             for (Symbol t : tree.targets.tail) {
                 if (t != syms.serializableType.tsym) {
                     markers.append(t);
                 }
             }
             int flags = isSerializable? FLAG_SERIALIZABLE : 0;
             boolean hasMarkers = markers.nonEmpty();
             flags |= hasMarkers ? FLAG_MARKERS : 0;
             staticArgs = staticArgs.append(flags);
             if (hasMarkers) {
                 staticArgs = staticArgs.append(markers.length());
                 staticArgs = staticArgs.appendList(markers.toList());
             }
             if (isSerializable) {
                 addDeserializationCase(refKind, refSym, tree.type, samSym,
                         tree, staticArgs, indyType);
             }
         }
         return makeIndyCall(tree, syms.lambdaMetafactory, metafactoryName, staticArgs, indyType, indy_args);
     }
     /**
      * Generate an indy method call with given name, type and static bootstrap
      * arguments types
      */
     private JCExpression makeIndyCall(DiagnosticPosition pos, Type site, Name bsmName,
             List<Object> staticArgs, MethodType indyType, List<JCExpression> indyArgs) {
         int prevPos = make.pos;
         try {
             make.at(pos);
             List<Type> bsm_staticArgs = List.of(syms.methodHandleLookupType,
                     syms.stringType,
                     syms.methodTypeType).appendList(bsmStaticArgToTypes(staticArgs));
             Symbol bsm = rs.resolveInternalMethod(pos, attrEnv, site,
                     bsmName, bsm_staticArgs, List.<Type>nil());
             DynamicMethodSymbol dynSym =
                     new DynamicMethodSymbol(names.lambda,
                                             syms.noSymbol,
                                             bsm.isStatic() ?
                                                 ClassFile.REF_invokeStatic :
                                                 ClassFile.REF_invokeVirtual,
                                             (MethodSymbol)bsm,
                                             indyType,
                                             staticArgs.toArray());
             JCFieldAccess qualifier = make.Select(make.QualIdent(site.tsym), bsmName);
             qualifier.sym = dynSym;
             qualifier.type = indyType.getReturnType();
             JCMethodInvocation proxyCall = make.Apply(List.<JCExpression>nil(), qualifier, indyArgs);
             proxyCall.type = indyType.getReturnType();
             return proxyCall;
         } finally {
             make.at(prevPos);
         }
     }
     //where
     private List<Type> bsmStaticArgToTypes(List<Object> args) {
         ListBuffer<Type> argtypes = ListBuffer.lb();
         for (Object arg : args) {
             argtypes.append(bsmStaticArgToType(arg));
         }
         return argtypes.toList();
     }
     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;
         }
     }
     /**
      * Get the opcode associated with this method reference
      */
     private int referenceKind(Symbol refSym) {
         if (refSym.isConstructor()) {
             return ClassFile.REF_newInvokeSpecial;
         } else {
             if (refSym.isStatic()) {
                 return ClassFile.REF_invokeStatic;
             } else if (refSym.enclClass().isInterface()) {
                 return ClassFile.REF_invokeInterface;
             } else {
                 return (refSym.flags() & PRIVATE) != 0 ?
                         ClassFile.REF_invokeSpecial :
                         ClassFile.REF_invokeVirtual;
             }
         }
     }
     // <editor-fold defaultstate="collapsed" desc="Lambda/reference analyzer">
     /**
      * This visitor collects information about translation of a lambda expression.
      * More specifically, it keeps track of the enclosing contexts and captured locals
      * accessed by the lambda being translated (as well as other useful info).
      * It also translates away problems for LambdaToMethod.
      */
     class LambdaAnalyzerPreprocessor extends TreeTranslator {
         /** the frame stack - used to reconstruct translation info about enclosing scopes */
         private List<Frame> frameStack;
         /**
          * keep the count of lambda expression (used to generate unambiguous
          * names)
          */
         private int lambdaCount = 0;
         /**
          * keep the count of lambda expression defined in given context (used to
          * generate unambiguous names for serializable lambdas)
          */
         private Map<String, Integer> serializableLambdaCounts =
                 new HashMap<String, Integer>();
         private Map<Symbol, JCClassDecl> localClassDefs;
         /**
          * maps for fake clinit symbols to be used as owners of lambda occurring in
          * a static var init context
          */
         private Map<ClassSymbol, Symbol> clinits =
                 new HashMap<ClassSymbol, Symbol>();
         private JCClassDecl analyzeAndPreprocessClass(JCClassDecl tree) {
             frameStack = List.nil();
             localClassDefs = new HashMap<Symbol, JCClassDecl>();
             return translate(tree);
         }
         @Override
         public void visitBlock(JCBlock tree) {
             List<Frame> prevStack = frameStack;
             try {
                 if (frameStack.nonEmpty() && frameStack.head.tree.hasTag(CLASSDEF)) {
                     frameStack = frameStack.prepend(new Frame(tree));
                 }
                 super.visitBlock(tree);
             }
             finally {
                 frameStack = prevStack;
             }
         }
         @Override
         public void visitClassDef(JCClassDecl tree) {
             List<Frame> prevStack = frameStack;
             Map<String, Integer> prevSerializableLambdaCount =
                     serializableLambdaCounts;
             Map<ClassSymbol, Symbol> prevClinits = clinits;
             try {
                 serializableLambdaCounts = new HashMap<String, Integer>();
                 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 {
                 frameStack = prevStack;
                 serializableLambdaCounts = prevSerializableLambdaCount;
                 clinits = prevClinits;
             }
         }
         @Override
         public void visitIdent(JCIdent tree) {
             if (context() != null && lambdaIdentSymbolFilter(tree.sym)) {
                 if (tree.sym.kind == VAR &&
                         tree.sym.owner.kind == MTH &&
                         tree.type.constValue() == null) {
                     TranslationContext<?> localContext = context();
                     while (localContext != null) {
                         if (localContext.tree.getTag() == LAMBDA) {
                             JCTree block = capturedDecl(localContext.depth, tree.sym);
                             if (block == null) break;
                             ((LambdaTranslationContext)localContext)
                                     .addSymbol(tree.sym, CAPTURED_VAR);
                         }
                         localContext = localContext.prev;
                     }
                 } else if (tree.sym.owner.kind == TYP) {
                     TranslationContext<?> localContext = context();
                     while (localContext != null) {
                         if (localContext.tree.hasTag(LAMBDA)) {
                             JCTree block = capturedDecl(localContext.depth, tree.sym);
                             if (block == null) break;
                             switch (block.getTag()) {
                                 case CLASSDEF:
                                     JCClassDecl cdecl = (JCClassDecl)block;
                                     ((LambdaTranslationContext)localContext)
                                             .addSymbol(cdecl.sym, CAPTURED_THIS);
                                     break;
                                 default:
                                     Assert.error("bad block kind");
                             }
                         }
                         localContext = localContext.prev;
                     }
                 }
             }
             super.visitIdent(tree);
         }
         @Override
         public void visitLambda(JCLambda tree) {
             List<Frame> prevStack = frameStack;
             try {
                 LambdaTranslationContext context = (LambdaTranslationContext)makeLambdaContext(tree);
                 frameStack = frameStack.prepend(new Frame(tree));
                 for (JCVariableDecl param : tree.params) {
                     context.addSymbol(param.sym, PARAM);
                     frameStack.head.addLocal(param.sym);
                 }
                 contextMap.put(tree, context);
                 super.visitLambda(tree);
                 context.complete();
             }
             finally {
                 frameStack = prevStack;
             }
         }
         @Override
         public void visitMethodDef(JCMethodDecl tree) {
             List<Frame> prevStack = frameStack;
             try {
                 frameStack = frameStack.prepend(new Frame(tree));
                 super.visitMethodDef(tree);
             }
             finally {
                 frameStack = prevStack;
             }
         }
         @Override
         public void visitNewClass(JCNewClass tree) {
             if (lambdaNewClassFilter(context(), tree)) {
                 TranslationContext<?> localContext = context();
                 while (localContext != null) {
                     if (localContext.tree.getTag() == LAMBDA) {
                         ((LambdaTranslationContext)localContext)
                                 .addSymbol(tree.type.getEnclosingType().tsym, CAPTURED_THIS);
                     }
                     localContext = localContext.prev;
                 }
             }
             if (context() != null && tree.type.tsym.owner.kind == MTH) {
                 LambdaTranslationContext lambdaContext = (LambdaTranslationContext)context();
                 captureLocalClassDefs(tree.type.tsym, lambdaContext);
             }
             super.visitNewClass(tree);
         }
         //where
             void captureLocalClassDefs(Symbol csym, final LambdaTranslationContext lambdaContext) {
                 JCClassDecl localCDef = localClassDefs.get(csym);
                 if (localCDef != null && localCDef.pos < lambdaContext.tree.pos) {
                     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);
                 }
         }
         /**
          * Method references to local class constructors, may, if the local
          * class references local variables, have implicit constructor
          * parameters added in Lower; As a result, the invokedynamic bootstrap
          * information added in the LambdaToMethod pass will have the wrong
          * signature. Hooks between Lower and LambdaToMethod have been added to
          * handle normal "new" in this case. This visitor converts potentially
          * effected method references into a lambda containing a normal "new" of
          * the class.
          *
          * @param tree
          */
         @Override
         public void visitReference(JCMemberReference tree) {
             if (tree.getMode() == ReferenceMode.NEW
                     && tree.kind != ReferenceKind.ARRAY_CTOR
                     && tree.sym.owner.isLocal()) {
                 MethodSymbol consSym = (MethodSymbol) tree.sym;
                 List<Type> ptypes = ((MethodType) consSym.type).getParameterTypes();
                 Type classType = consSym.owner.type;
                 // Build lambda parameters
                 // partially cloned from TreeMaker.Params until 8014021 is fixed
                 Symbol owner = owner();
                 ListBuffer<JCVariableDecl> paramBuff = new ListBuffer<JCVariableDecl>();
                 int i = 0;
                 for (List<Type> l = ptypes; l.nonEmpty(); l = l.tail) {
                     paramBuff.append(make.Param(make.paramName(i++), l.head, owner));
                 }
                 List<JCVariableDecl> params = paramBuff.toList();
                 // Make new-class call
                 JCNewClass nc = makeNewClass(classType, make.Idents(params));
                 nc.pos = tree.pos;
                 // Make lambda holding the new-class call
                 JCLambda slam = make.Lambda(params, nc);
                 slam.descriptorType = tree.descriptorType;
                 slam.targets = tree.targets;
                 slam.type = tree.type;
                 slam.pos = tree.pos;
                 // Now it is a lambda, process as such
                 visitLambda(slam);
             } else {
                 super.visitReference(tree);
                 contextMap.put(tree, makeReferenceContext(tree));
             }
         }
         @Override
         public void visitSelect(JCFieldAccess tree) {
             if (context() != null && lambdaSelectSymbolFilter(tree.sym)) {
                 TranslationContext<?> localContext = context();
                 while (localContext != null) {
                     if (localContext.tree.hasTag(LAMBDA)) {
                         JCClassDecl clazz = (JCClassDecl)capturedDecl(localContext.depth, tree.sym);
                         if (clazz == null) break;
                         ((LambdaTranslationContext)localContext).addSymbol(clazz.sym, CAPTURED_THIS);
                     }
                     localContext = localContext.prev;
                 }
             }
             super.visitSelect(tree);
         }
         @Override
         public void visitVarDef(JCVariableDecl tree) {
             TranslationContext<?> context = context();
             LambdaTranslationContext ltc = (context != null && context instanceof LambdaTranslationContext)?
                     (LambdaTranslationContext)context :
                     null;
             if (ltc != null) {
                 if (frameStack.head.tree.hasTag(LAMBDA)) {
                     ltc.addSymbol(tree.sym, LOCAL_VAR);
                 }
                 // Check for type variables (including as type arguments).
                 // If they occur within class nested in a lambda, mark for erasure
                 Type type = tree.sym.asType();
                 if (inClassWithinLambda() && !types.isSameType(types.erasure(type), type)) {
                     ltc.addSymbol(tree.sym, TYPE_VAR);
                 }
             }
             List<Frame> prevStack = frameStack;
             try {
                 if (tree.sym.owner.kind == MTH) {
                     frameStack.head.addLocal(tree.sym);
                 }
                 frameStack = frameStack.prepend(new Frame(tree));
                 super.visitVarDef(tree);
             }
             finally {
                 frameStack = prevStack;
             }
         }
         private Name lambdaName() {
             return names.lambda.append(names.fromString("" + lambdaCount++));
         }
         /**
          * For a serializable lambda, generate a name which maximizes name
          * stability across deserialization.
          * @param owner
          * @return Name to use for the synthetic lambda method name
          */
         private Name serializedLambdaName(Symbol owner) {
             StringBuilder buf = new StringBuilder();
             buf.append(names.lambda);
             // Append the name of the method enclosing the lambda.
             String methodName = owner.name.toString();
             if (methodName.equals("<clinit>"))
                 methodName = "static";
             else if (methodName.equals("<init>"))
                 methodName = "new";
             buf.append(methodName);
             buf.append('$');
             // Append a hash of the enclosing method signature to differentiate
             // overloaded enclosing methods.  For lambdas enclosed in lambdas,
             // the generated lambda method will not have type yet, but the
             // enclosing method's name will have been generated with this same
             // method, so it will be unique and never be overloaded.
             Assert.check(owner.type != null || directlyEnclosingLambda() != null);
             if (owner.type != null) {
                 int methTypeHash = methodSig(owner.type).hashCode();
                 buf.append(Integer.toHexString(methTypeHash));
             }
             buf.append('$');
             // The above appended name components may not be unique, append a
             // count based on the above name components.
             String temp = buf.toString();
             Integer count = serializableLambdaCounts.get(temp);
             if (count == null) {
                 count = 0;
             }
             buf.append(count++);
             serializableLambdaCounts.put(temp, count);
             return names.fromString(buf.toString());
         }
         /**
          * Return a valid owner given the current declaration stack
          * (required to skip synthetic lambda symbols)
          */
         private Symbol owner() {
             return owner(false);
         }
         @SuppressWarnings("fallthrough")
         private Symbol owner(boolean skipLambda) {
             List<Frame> frameStack2 = frameStack;
             while (frameStack2.nonEmpty()) {
                 switch (frameStack2.head.tree.getTag()) {
                     case VARDEF:
                         if (((JCVariableDecl)frameStack2.head.tree).sym.isLocal()) {
                             frameStack2 = frameStack2.tail;
                             break;
                         }
                         JCClassDecl cdecl = (JCClassDecl)frameStack2.tail.head.tree;
                         return initSym(cdecl.sym,
                                 ((JCVariableDecl)frameStack2.head.tree).sym.flags() & STATIC);
                     case BLOCK:
                         JCClassDecl cdecl2 = (JCClassDecl)frameStack2.tail.head.tree;
                         return initSym(cdecl2.sym,
                                 ((JCBlock)frameStack2.head.tree).flags & STATIC);
                     case CLASSDEF:
                         return ((JCClassDecl)frameStack2.head.tree).sym;
                     case METHODDEF:
                         return ((JCMethodDecl)frameStack2.head.tree).sym;
                     case LAMBDA:
                         if (!skipLambda)
                             return ((LambdaTranslationContext)contextMap
                                     .get(frameStack2.head.tree)).translatedSym;
                     default:
                         frameStack2 = frameStack2.tail;
                 }
             }
             Assert.error();
             return null;
         }
         private Symbol initSym(ClassSymbol csym, long flags) {
             boolean isStatic = (flags & STATIC) != 0;
             if (isStatic) {
                 //static clinits are generated in Gen - so we need to fake them
                 Symbol clinit = clinits.get(csym);
                 if (clinit == null) {
                     clinit = makeSyntheticMethod(STATIC,
                             names.clinit,
                             new MethodType(List.<Type>nil(), syms.voidType, List.<Type>nil(), syms.methodClass),
                             csym);
                     clinits.put(csym, clinit);
                 }
                 return clinit;
             } else {
                 //get the first constructor and treat it as the instance init sym
                 for (Symbol s : csym.members_field.getElementsByName(names.init)) {
                     return s;
                 }
             }
             Assert.error("init not found");
             return null;
         }
         private JCTree directlyEnclosingLambda() {
             if (frameStack.isEmpty()) {
                 return null;
             }
             List<Frame> frameStack2 = frameStack;
             while (frameStack2.nonEmpty()) {
                 switch (frameStack2.head.tree.getTag()) {
                     case CLASSDEF:
                     case METHODDEF:
                         return null;
                     case LAMBDA:
                         return frameStack2.head.tree;
                     default:
                         frameStack2 = frameStack2.tail;
                 }
             }
             Assert.error();
             return null;
         }
         private boolean inClassWithinLambda() {
             if (frameStack.isEmpty()) {
                 return false;
             }
             List<Frame> frameStack2 = frameStack;
             boolean classFound = false;
             while (frameStack2.nonEmpty()) {
                 switch (frameStack2.head.tree.getTag()) {
                     case LAMBDA:
                         return classFound;
                     case CLASSDEF:
                         classFound = true;
                         frameStack2 = frameStack2.tail;
                         break;
                     default:
                         frameStack2 = frameStack2.tail;
                 }
             }
             // No lambda
             return false;
         }
         /**
          * Return the declaration corresponding to a symbol in the enclosing
          * scope; the depth parameter is used to filter out symbols defined
          * in nested scopes (which do not need to undergo capture).
          */
         private JCTree capturedDecl(int depth, Symbol sym) {
             int currentDepth = frameStack.size() - 1;
             for (Frame block : frameStack) {
                 switch (block.tree.getTag()) {
                     case CLASSDEF:
                         ClassSymbol clazz = ((JCClassDecl)block.tree).sym;
                         if (sym.isMemberOf(clazz, types)) {
                             return currentDepth > depth ? null : block.tree;
                         }
                         break;
                     case VARDEF:
                         if (((JCVariableDecl)block.tree).sym == sym &&
                                 sym.owner.kind == MTH) { //only locals are captured
                             return currentDepth > depth ? null : block.tree;
                         }
                         break;
                     case BLOCK:
                     case METHODDEF:
                     case LAMBDA:
                         if (block.locals != null && block.locals.contains(sym)) {
                             return currentDepth > depth ? null : block.tree;
                         }
                         break;
                     default:
                         Assert.error("bad decl kind " + block.tree.getTag());
                 }
                 currentDepth--;
             }
             return null;
         }
         private TranslationContext<?> context() {
             for (Frame frame : frameStack) {
                 TranslationContext<?> context = contextMap.get(frame.tree);
                 if (context != null) {
                     return context;
                 }
             }
             return null;
         }
         /**
          *  This is used to filter out those identifiers that needs to be adjusted
          *  when translating away lambda expressions
          */
         private boolean lambdaIdentSymbolFilter(Symbol sym) {
             return (sym.kind == VAR || sym.kind == MTH)
                     && !sym.isStatic()
                     && sym.name != names.init;
         }
         private boolean lambdaSelectSymbolFilter(Symbol sym) {
             return (sym.kind == VAR || sym.kind == MTH) &&
                         !sym.isStatic() &&
                         (sym.name == names._this ||
                         sym.name == names._super);
         }
         /**
          * This is used to filter out those new class expressions that need to
          * be qualified with an enclosing tree
          */
         private boolean lambdaNewClassFilter(TranslationContext<?> context, JCNewClass tree) {
             if (context != null
                     && tree.encl == null
                     && tree.def == null
                     && !tree.type.getEnclosingType().hasTag(NONE)) {
                 Type encl = tree.type.getEnclosingType();
                 Type current = context.owner.enclClass().type;
                 while (!current.hasTag(NONE)) {
                     if (current.tsym.isSubClass(encl.tsym, types)) {
                         return true;
                     }
                     current = current.getEnclosingType();
                 }
                 return false;
             } else {
                 return false;
             }
         }
         private TranslationContext<JCLambda> makeLambdaContext(JCLambda tree) {
             return new LambdaTranslationContext(tree);
         }
         private TranslationContext<JCMemberReference> makeReferenceContext(JCMemberReference tree) {
             return new ReferenceTranslationContext(tree);
         }
         private class Frame {
             final JCTree tree;
             List<Symbol> locals;
             public Frame(JCTree tree) {
                 this.tree = tree;
             }
             void addLocal(Symbol sym) {
                 if (locals == null) {
                     locals = List.nil();
                 }
                 locals = locals.prepend(sym);
             }
         }
         /**
          * This class is used to store important information regarding translation of
          * lambda expression/method references (see subclasses).
          */
         private abstract class TranslationContext<T extends JCFunctionalExpression> {
             /** the underlying (untranslated) tree */
             T tree;
             /** points to the adjusted enclosing scope in which this lambda/mref expression occurs */
             Symbol owner;
             /** the depth of this lambda expression in the frame stack */
             int depth;
             /** the enclosing translation context (set for nested lambdas/mref) */
             TranslationContext<?> prev;
             TranslationContext(T tree) {
                 this.tree = tree;
                 this.owner = owner();
                 this.depth = frameStack.size() - 1;
                 this.prev = context();
             }
             /** does this functional expression need to be created using alternate metafactory? */
             boolean needsAltMetafactory() {
                 return (tree.targets.length() > 1 ||
                         isSerializable());
             }
             /** does this functional expression require serialization support? */
             boolean isSerializable() {
                 for (Symbol target : tree.targets) {
                     if (types.asSuper(target.type, syms.serializableType.tsym) != null) {
                         return true;
                     }
                 }
                 return false;
             }
         }
         /**
          * This class retains all the useful information about a lambda expression;
          * the contents of this class are filled by the LambdaAnalyzer visitor,
          * and the used by the main translation routines in order to adjust references
          * to captured locals/members, etc.
          */
         private class LambdaTranslationContext extends TranslationContext<JCLambda> {
             /** variable in the enclosing context to which this lambda is assigned */
             Symbol self;
             /** map from original to translated lambda parameters */
             Map<Symbol, Symbol> lambdaParams = new LinkedHashMap<Symbol, Symbol>();
             /** map from original to translated lambda locals */
             Map<Symbol, Symbol> lambdaLocals = new LinkedHashMap<Symbol, Symbol>();
             /** map from variables in enclosing scope to translated synthetic parameters */
             Map<Symbol, Symbol> capturedLocals  = new LinkedHashMap<Symbol, Symbol>();
             /** map from class symbols to translated synthetic parameters (for captured member access) */
             Map<Symbol, Symbol> capturedThis = new LinkedHashMap<Symbol, Symbol>();
             /** map from original to translated lambda locals */
             Map<Symbol, Symbol> typeVars = new LinkedHashMap<Symbol, Symbol>();
             /** the synthetic symbol for the method hoisting the translated lambda */
             Symbol translatedSym;
             List<JCVariableDecl> syntheticParams;
             LambdaTranslationContext(JCLambda tree) {
                 super(tree);
                 Frame frame = frameStack.head;
                 if (frame.tree.hasTag(VARDEF)) {
                     self = ((JCVariableDecl)frame.tree).sym;
                 }
                 Name name = isSerializable() ? serializedLambdaName(owner) : lambdaName();
                 this.translatedSym = makeSyntheticMethod(0, name, null, owner.enclClass());
             }
             /**
              * Translate a symbol of a given kind into something suitable for the
              * synthetic lambda body
              */
             Symbol translate(Name name, final Symbol sym, LambdaSymbolKind skind) {
                 Symbol ret;
                 switch (skind) {
                     case CAPTURED_THIS:
                         ret = sym;  // self represented
                         break;
                     case TYPE_VAR:
                         // Just erase the type var
                         ret = new VarSymbol(sym.flags(), name,
                                 types.erasure(sym.type), sym.owner);
                         break;
                     case CAPTURED_VAR:
                         ret = new VarSymbol(SYNTHETIC | FINAL, name, types.erasure(sym.type), translatedSym) {
                             @Override
                             public Symbol baseSymbol() {
                                 //keep mapping with original captured symbol
                                 return sym;
                             }
                         };
                         break;
                     default:
                         ret = makeSyntheticVar(FINAL, name, types.erasure(sym.type), translatedSym);
                 }
                 if (ret != sym) {
                     ret.annotations.setDeclarationAttributes(sym.getRawAttributes());
                     ret.annotations.setTypeAttributes(sym.getRawTypeAttributes());
                 }
                 return ret;
             }
             void addSymbol(Symbol sym, LambdaSymbolKind skind) {
                 Map<Symbol, Symbol> transMap = null;
                 Name preferredName;
                 switch (skind) {
                     case CAPTURED_THIS:
                         transMap = capturedThis;
                         preferredName = names.fromString("encl$" + capturedThis.size());
                         break;
                     case CAPTURED_VAR:
                         transMap = capturedLocals;
                         preferredName = names.fromString("cap$" + capturedLocals.size());
                         break;
                     case LOCAL_VAR:
                         transMap = lambdaLocals;
                         preferredName = sym.name;
                         break;
                     case PARAM:
                         transMap = lambdaParams;
                         preferredName = sym.name;
                         break;
                     case TYPE_VAR:
                         transMap = typeVars;
                         preferredName = sym.name;
                         break;
                     default: throw new AssertionError();
                 }
                 if (!transMap.containsKey(sym)) {
                     transMap.put(sym, translate(preferredName, sym, skind));
                 }
             }
             Map<Symbol, Symbol> getSymbolMap(LambdaSymbolKind... skinds) {
                 LinkedHashMap<Symbol, Symbol> translationMap = new LinkedHashMap<Symbol, Symbol>();
                 for (LambdaSymbolKind skind : skinds) {
                     switch (skind) {
                         case CAPTURED_THIS:
                             translationMap.putAll(capturedThis);
                             break;
                         case CAPTURED_VAR:
                             translationMap.putAll(capturedLocals);
                             break;
                         case LOCAL_VAR:
                             translationMap.putAll(lambdaLocals);
                             break;
                         case PARAM:
                             translationMap.putAll(lambdaParams);
                             break;
                         case TYPE_VAR:
                             translationMap.putAll(typeVars);
                             break;
                         default: throw new AssertionError();
                     }
                 }
                 return translationMap;
             }
             /**
              * The translatedSym is not complete/accurate until the analysis is
              * finished.  Once the analysis is finished, the translatedSym is
              * "completed" -- updated with type information, access modifiers,
              * and full parameter list.
              */
             void complete() {
                 if (syntheticParams != null) {
                     return;
                 }
                 boolean inInterface = translatedSym.owner.isInterface();
                 boolean thisReferenced = !getSymbolMap(CAPTURED_THIS).isEmpty();
                 // If instance access isn't needed, make it static.
                 // Interface instance methods must be default methods.
                 // Awaiting VM channges, default methods are public
                 translatedSym.flags_field = SYNTHETIC |
                         ((inInterface && thisReferenced)? PUBLIC : PRIVATE) |
                         (thisReferenced? (inInterface? DEFAULT : 0) : STATIC);
                 //compute synthetic params
                 ListBuffer<JCVariableDecl> params = ListBuffer.lb();
                 // The signature of the method is augmented with the following
                 // synthetic parameters:
                 //
                 // 1) reference to enclosing contexts captured by the lambda expression
                 // 2) enclosing locals captured by the lambda expression
                 for (Symbol thisSym : getSymbolMap(CAPTURED_VAR, PARAM).values()) {
                     params.append(make.VarDef((VarSymbol) thisSym, null));
                 }
                 syntheticParams = params.toList();
                 //prepend synthetic args to translated lambda method signature
                 translatedSym.type = types.createMethodTypeWithParameters(
                         generatedLambdaSig(),
                         TreeInfo.types(syntheticParams));
             }
             Type generatedLambdaSig() {
                 return types.erasure(tree.descriptorType);
             }
         }
         /**
          * This class retains all the useful information about a method reference;
          * the contents of this class are filled by the LambdaAnalyzer visitor,
          * and the used by the main translation routines in order to adjust method
          * references (i.e. in case a bridge is needed)
          */
         private class ReferenceTranslationContext extends TranslationContext<JCMemberReference> {
             final boolean isSuper;
             final Symbol bridgeSym;
             ReferenceTranslationContext(JCMemberReference tree) {
                 super(tree);
                 this.isSuper = tree.hasKind(ReferenceKind.SUPER);
                 this.bridgeSym = needsBridge()
                         ? makeSyntheticMethod(isSuper ? 0 : STATIC,
                                               lambdaName().append(names.fromString("$bridge")), null,
                                               owner.enclClass())
                         : null;
             }
             /**
              * Get the opcode associated with this method reference
              */
             int referenceKind() {
                 return LambdaToMethod.this.referenceKind(needsBridge() ? bridgeSym : tree.sym);
             }
             boolean needsVarArgsConversion() {
                 return tree.varargsElement != null;
             }
             /**
              * @return Is this an array operation like clone()
              */
             boolean isArrayOp() {
                 return tree.sym.owner == syms.arrayClass;
             }
             boolean isPrivateConstructor() {
                 //hack needed to workaround 292 bug (8005122)
                 //when 292 issue is fixed we should simply remove this
                 return tree.sym.name == names.init &&
                         (tree.sym.flags() & PRIVATE) != 0;
             }
             boolean receiverAccessible() {
                 //hack needed to workaround 292 bug (7087658)
                 //when 292 issue is fixed we should remove this and change the backend
                 //code to always generate a method handle to an accessible method
                 return tree.ownerAccessible;
             }
             /**
              * Does this reference needs a bridge (i.e. var args need to be
              * expanded or "super" is used)
              */
             final boolean needsBridge() {
                 return isSuper || needsVarArgsConversion() || isArrayOp() ||
                         isPrivateConstructor() || !receiverAccessible();
             }
             Type generatedRefSig() {
                 return types.erasure(tree.sym.type);
             }
             Type bridgedRefSig() {
                 return types.erasure(types.findDescriptorSymbol(tree.targets.head).type);
             }
         }
     }
     // </editor-fold>
     enum LambdaSymbolKind {
         CAPTURED_VAR,
         CAPTURED_THIS,
         LOCAL_VAR,
         PARAM,
         TYPE_VAR;
     }
     /**
      * ****************************************************************
      * Signature Generation
      * ****************************************************************
      */
     private String methodSig(Type type) {
         L2MSignatureGenerator sg = new L2MSignatureGenerator();
         sg.assembleSig(type);
         return sg.toString();
     }
     private String classSig(Type type) {
         L2MSignatureGenerator sg = new L2MSignatureGenerator();
         sg.assembleClassSig(type);
         return sg.toString();
     }
     /**
      * Signature Generation
      */
     private class L2MSignatureGenerator extends Types.SignatureGenerator {
         /**
          * An output buffer for type signatures.
          */
         StringBuilder sb = new StringBuilder();
         L2MSignatureGenerator() {
             super(types);
         }
         @Override
         protected void append(char ch) {
             sb.append(ch);
         }
         @Override
         protected void append(byte[] ba) {
             sb.append(new String(ba));
         }
         @Override
         protected void append(Name name) {
             sb.append(name.toString());
         }
         @Override
         public String toString() {
             return sb.toString();
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/comp/LambdaToMethod.java@05ec778794d0 (annotated)

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