Mon, 29 Oct 2012 10:39:49 -0700
8000694: Add generation of lambda implementation code: invokedynamic call, lambda method, adaptor methods
Summary: Add lambda implementation code with calling/supporting code elsewhere in the compiler
Reviewed-by: mcimadamore, jjg
rfield@1380 | 1 | /* |
rfield@1380 | 2 | * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved. |
rfield@1380 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
rfield@1380 | 4 | * |
rfield@1380 | 5 | * This code is free software; you can redistribute it and/or modify it |
rfield@1380 | 6 | * under the terms of the GNU General Public License version 2 only, as |
rfield@1380 | 7 | * published by the Free Software Foundation. Oracle designates this |
rfield@1380 | 8 | * particular file as subject to the "Classpath" exception as provided |
rfield@1380 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
rfield@1380 | 10 | * |
rfield@1380 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
rfield@1380 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
rfield@1380 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
rfield@1380 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
rfield@1380 | 15 | * accompanied this code). |
rfield@1380 | 16 | * |
rfield@1380 | 17 | * You should have received a copy of the GNU General Public License version |
rfield@1380 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
rfield@1380 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
rfield@1380 | 20 | * |
rfield@1380 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
rfield@1380 | 22 | * or visit www.oracle.com if you need additional information or have any |
rfield@1380 | 23 | * questions. |
rfield@1380 | 24 | */ |
rfield@1380 | 25 | package com.sun.tools.javac.comp; |
rfield@1380 | 26 | |
rfield@1380 | 27 | import com.sun.tools.javac.tree.*; |
rfield@1380 | 28 | import com.sun.tools.javac.tree.JCTree; |
rfield@1380 | 29 | import com.sun.tools.javac.tree.JCTree.*; |
rfield@1380 | 30 | import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind; |
rfield@1380 | 31 | import com.sun.tools.javac.tree.TreeMaker; |
rfield@1380 | 32 | import com.sun.tools.javac.tree.TreeScanner; |
rfield@1380 | 33 | import com.sun.tools.javac.tree.TreeTranslator; |
rfield@1380 | 34 | import com.sun.tools.javac.code.Flags; |
rfield@1380 | 35 | import com.sun.tools.javac.code.Kinds; |
rfield@1380 | 36 | import com.sun.tools.javac.code.Symbol; |
rfield@1380 | 37 | import com.sun.tools.javac.code.Symbol.ClassSymbol; |
rfield@1380 | 38 | import com.sun.tools.javac.code.Symbol.DynamicMethodSymbol; |
rfield@1380 | 39 | import com.sun.tools.javac.code.Symbol.MethodSymbol; |
rfield@1380 | 40 | import com.sun.tools.javac.code.Symbol.VarSymbol; |
rfield@1380 | 41 | import com.sun.tools.javac.code.Symtab; |
rfield@1380 | 42 | import com.sun.tools.javac.code.Type; |
rfield@1380 | 43 | import com.sun.tools.javac.code.Type.ClassType; |
rfield@1380 | 44 | import com.sun.tools.javac.code.Type.MethodType; |
rfield@1380 | 45 | import com.sun.tools.javac.code.Types; |
rfield@1380 | 46 | import com.sun.tools.javac.comp.LambdaToMethod.LambdaAnalyzer.*; |
rfield@1380 | 47 | import com.sun.tools.javac.jvm.*; |
rfield@1380 | 48 | import com.sun.tools.javac.util.*; |
rfield@1380 | 49 | import com.sun.tools.javac.util.List; |
rfield@1380 | 50 | import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; |
rfield@1380 | 51 | import com.sun.source.tree.MemberReferenceTree.ReferenceMode; |
rfield@1380 | 52 | |
rfield@1380 | 53 | import java.util.HashMap; |
rfield@1380 | 54 | import java.util.LinkedHashMap; |
rfield@1380 | 55 | import java.util.Map; |
rfield@1380 | 56 | |
rfield@1380 | 57 | import static com.sun.tools.javac.comp.LambdaToMethod.LambdaSymbolKind.*; |
rfield@1380 | 58 | import static com.sun.tools.javac.code.Flags.*; |
rfield@1380 | 59 | import static com.sun.tools.javac.code.Kinds.*; |
rfield@1380 | 60 | import static com.sun.tools.javac.code.TypeTag.BOT; |
rfield@1380 | 61 | import static com.sun.tools.javac.code.TypeTag.NONE; |
rfield@1380 | 62 | import static com.sun.tools.javac.code.TypeTag.VOID; |
rfield@1380 | 63 | import static com.sun.tools.javac.tree.JCTree.Tag.*; |
rfield@1380 | 64 | |
rfield@1380 | 65 | /** |
rfield@1380 | 66 | * This pass desugars lambda expressions into static methods |
rfield@1380 | 67 | * |
rfield@1380 | 68 | * <p><b>This is NOT part of any supported API. |
rfield@1380 | 69 | * If you write code that depends on this, you do so at your own risk. |
rfield@1380 | 70 | * This code and its internal interfaces are subject to change or |
rfield@1380 | 71 | * deletion without notice.</b> |
rfield@1380 | 72 | */ |
rfield@1380 | 73 | public class LambdaToMethod extends TreeTranslator { |
rfield@1380 | 74 | |
rfield@1380 | 75 | private Names names; |
rfield@1380 | 76 | private Symtab syms; |
rfield@1380 | 77 | private Resolve rs; |
rfield@1380 | 78 | private TreeMaker make; |
rfield@1380 | 79 | private Types types; |
rfield@1380 | 80 | private TransTypes transTypes; |
rfield@1380 | 81 | private Env<AttrContext> attrEnv; |
rfield@1380 | 82 | |
rfield@1380 | 83 | /** the analyzer scanner */ |
rfield@1380 | 84 | private LambdaAnalyzer analyzer; |
rfield@1380 | 85 | |
rfield@1380 | 86 | /** map from lambda trees to translation contexts */ |
rfield@1380 | 87 | private Map<JCTree, TranslationContext<?>> contextMap; |
rfield@1380 | 88 | |
rfield@1380 | 89 | /** current translation context (visitor argument) */ |
rfield@1380 | 90 | private TranslationContext<?> context; |
rfield@1380 | 91 | |
rfield@1380 | 92 | /** list of translated methods |
rfield@1380 | 93 | **/ |
rfield@1380 | 94 | private ListBuffer<JCTree> translatedMethodList; |
rfield@1380 | 95 | |
rfield@1380 | 96 | // <editor-fold defaultstate="collapsed" desc="Instantiating"> |
rfield@1380 | 97 | private static final Context.Key<LambdaToMethod> unlambdaKey = |
rfield@1380 | 98 | new Context.Key<LambdaToMethod>(); |
rfield@1380 | 99 | |
rfield@1380 | 100 | public static LambdaToMethod instance(Context context) { |
rfield@1380 | 101 | LambdaToMethod instance = context.get(unlambdaKey); |
rfield@1380 | 102 | if (instance == null) { |
rfield@1380 | 103 | instance = new LambdaToMethod(context); |
rfield@1380 | 104 | } |
rfield@1380 | 105 | return instance; |
rfield@1380 | 106 | } |
rfield@1380 | 107 | |
rfield@1380 | 108 | private LambdaToMethod(Context context) { |
rfield@1380 | 109 | names = Names.instance(context); |
rfield@1380 | 110 | syms = Symtab.instance(context); |
rfield@1380 | 111 | rs = Resolve.instance(context); |
rfield@1380 | 112 | make = TreeMaker.instance(context); |
rfield@1380 | 113 | types = Types.instance(context); |
rfield@1380 | 114 | transTypes = TransTypes.instance(context); |
rfield@1380 | 115 | this.analyzer = makeAnalyzer(); |
rfield@1380 | 116 | } |
rfield@1380 | 117 | |
rfield@1380 | 118 | private LambdaAnalyzer makeAnalyzer() { |
rfield@1380 | 119 | return new LambdaAnalyzer(); |
rfield@1380 | 120 | } |
rfield@1380 | 121 | // </editor-fold> |
rfield@1380 | 122 | |
rfield@1380 | 123 | // <editor-fold defaultstate="collapsed" desc="translate methods"> |
rfield@1380 | 124 | @Override |
rfield@1380 | 125 | public <T extends JCTree> T translate(T tree) { |
rfield@1380 | 126 | TranslationContext<?> newContext = contextMap.get(tree); |
rfield@1380 | 127 | return translate(tree, newContext != null ? newContext : context); |
rfield@1380 | 128 | } |
rfield@1380 | 129 | |
rfield@1380 | 130 | public <T extends JCTree> T translate(T tree, TranslationContext<?> newContext) { |
rfield@1380 | 131 | TranslationContext<?> prevContext = context; |
rfield@1380 | 132 | try { |
rfield@1380 | 133 | context = newContext; |
rfield@1380 | 134 | return super.translate(tree); |
rfield@1380 | 135 | } |
rfield@1380 | 136 | finally { |
rfield@1380 | 137 | context = prevContext; |
rfield@1380 | 138 | } |
rfield@1380 | 139 | } |
rfield@1380 | 140 | |
rfield@1380 | 141 | public <T extends JCTree> List<T> translate(List<T> trees, TranslationContext<?> newContext) { |
rfield@1380 | 142 | ListBuffer<T> buf = ListBuffer.lb(); |
rfield@1380 | 143 | for (T tree : trees) { |
rfield@1380 | 144 | buf.append(translate(tree, newContext)); |
rfield@1380 | 145 | } |
rfield@1380 | 146 | return buf.toList(); |
rfield@1380 | 147 | } |
rfield@1380 | 148 | |
rfield@1380 | 149 | public JCTree translateTopLevelClass(Env<AttrContext> env, JCTree cdef, TreeMaker make) { |
rfield@1380 | 150 | this.make = make; |
rfield@1380 | 151 | this.attrEnv = env; |
rfield@1380 | 152 | this.context = null; |
rfield@1380 | 153 | this.contextMap = new HashMap<JCTree, TranslationContext<?>>(); |
rfield@1380 | 154 | return translate(cdef); |
rfield@1380 | 155 | } |
rfield@1380 | 156 | // </editor-fold> |
rfield@1380 | 157 | |
rfield@1380 | 158 | // <editor-fold defaultstate="collapsed" desc="visitor methods"> |
rfield@1380 | 159 | /** |
rfield@1380 | 160 | * Visit a class. |
rfield@1380 | 161 | * Maintain the translatedMethodList across nested classes. |
rfield@1380 | 162 | * Append the translatedMethodList to the class after it is translated. |
rfield@1380 | 163 | * @param tree |
rfield@1380 | 164 | */ |
rfield@1380 | 165 | @Override |
rfield@1380 | 166 | public void visitClassDef(JCClassDecl tree) { |
rfield@1380 | 167 | if (tree.sym.owner.kind == PCK) { |
rfield@1380 | 168 | //analyze class |
rfield@1380 | 169 | analyzer.analyzeClass(tree); |
rfield@1380 | 170 | } |
rfield@1380 | 171 | ListBuffer<JCTree> prevTranslated = translatedMethodList; |
rfield@1380 | 172 | try { |
rfield@1380 | 173 | translatedMethodList = ListBuffer.lb(); |
rfield@1380 | 174 | super.visitClassDef(tree); |
rfield@1380 | 175 | //add all translated instance methods here |
rfield@1380 | 176 | tree.defs = tree.defs.appendList(translatedMethodList.toList()); |
rfield@1380 | 177 | for (JCTree lambda : translatedMethodList) { |
rfield@1380 | 178 | tree.sym.members().enter(((JCMethodDecl)lambda).sym); |
rfield@1380 | 179 | } |
rfield@1380 | 180 | result = tree; |
rfield@1380 | 181 | } finally { |
rfield@1380 | 182 | translatedMethodList = prevTranslated; |
rfield@1380 | 183 | } |
rfield@1380 | 184 | } |
rfield@1380 | 185 | |
rfield@1380 | 186 | /** |
rfield@1380 | 187 | * Translate a lambda into a method to be inserted into the class. |
rfield@1380 | 188 | * Then replace the lambda site with an invokedynamic call of to lambda |
rfield@1380 | 189 | * meta-factory, which will use the lambda method. |
rfield@1380 | 190 | * @param tree |
rfield@1380 | 191 | */ |
rfield@1380 | 192 | @Override |
rfield@1380 | 193 | public void visitLambda(JCLambda tree) { |
rfield@1380 | 194 | LambdaTranslationContext localContext = (LambdaTranslationContext)context; |
rfield@1380 | 195 | MethodSymbol sym = (MethodSymbol)localContext.translatedSym; |
rfield@1380 | 196 | MethodType lambdaType = (MethodType) sym.type; |
rfield@1380 | 197 | |
rfield@1380 | 198 | //create the method declaration hoisting the lambda body |
rfield@1380 | 199 | JCMethodDecl lambdaDecl = make.MethodDef(make.Modifiers(sym.flags_field), |
rfield@1380 | 200 | sym.name, |
rfield@1380 | 201 | make.QualIdent(lambdaType.getReturnType().tsym), |
rfield@1380 | 202 | List.<JCTypeParameter>nil(), |
rfield@1380 | 203 | localContext.syntheticParams, |
rfield@1380 | 204 | lambdaType.getThrownTypes() == null ? |
rfield@1380 | 205 | List.<JCExpression>nil() : |
rfield@1380 | 206 | make.Types(lambdaType.getThrownTypes()), |
rfield@1380 | 207 | null, |
rfield@1380 | 208 | null); |
rfield@1380 | 209 | lambdaDecl.sym = sym; |
rfield@1380 | 210 | lambdaDecl.type = lambdaType; |
rfield@1380 | 211 | |
rfield@1380 | 212 | //translate lambda body |
rfield@1380 | 213 | //As the lambda body is translated, all references to lambda locals, |
rfield@1380 | 214 | //captured variables, enclosing members are adjusted accordingly |
rfield@1380 | 215 | //to refer to the static method parameters (rather than i.e. acessing to |
rfield@1380 | 216 | //captured members directly). |
rfield@1380 | 217 | lambdaDecl.body = translate(makeLambdaBody(tree, lambdaDecl)); |
rfield@1380 | 218 | |
rfield@1380 | 219 | //Add the method to the list of methods to be added to this class. |
rfield@1380 | 220 | translatedMethodList = translatedMethodList.prepend(lambdaDecl); |
rfield@1380 | 221 | |
rfield@1380 | 222 | //now that we have generated a method for the lambda expression, |
rfield@1380 | 223 | //we can translate the lambda into a method reference pointing to the newly |
rfield@1380 | 224 | //created method. |
rfield@1380 | 225 | // |
rfield@1380 | 226 | //Note that we need to adjust the method handle so that it will match the |
rfield@1380 | 227 | //signature of the SAM descriptor - this means that the method reference |
rfield@1380 | 228 | //should be added the following synthetic arguments: |
rfield@1380 | 229 | // |
rfield@1380 | 230 | // * the "this" argument if it is an instance method |
rfield@1380 | 231 | // * enclosing locals captured by the lambda expression |
rfield@1380 | 232 | |
rfield@1380 | 233 | ListBuffer<JCExpression> syntheticInits = ListBuffer.lb(); |
rfield@1380 | 234 | |
rfield@1380 | 235 | if (!sym.isStatic()) { |
rfield@1380 | 236 | syntheticInits.append(makeThis( |
rfield@1380 | 237 | sym.owner.asType(), |
rfield@1380 | 238 | localContext.owner.enclClass())); |
rfield@1380 | 239 | } |
rfield@1380 | 240 | |
rfield@1380 | 241 | //add captured locals |
rfield@1380 | 242 | for (Symbol fv : localContext.getSymbolMap(CAPTURED_VAR).keySet()) { |
rfield@1380 | 243 | if (fv != localContext.self) { |
rfield@1380 | 244 | JCTree captured_local = make.Ident(fv).setType(fv.type); |
rfield@1380 | 245 | syntheticInits.append((JCExpression) captured_local); |
rfield@1380 | 246 | } |
rfield@1380 | 247 | } |
rfield@1380 | 248 | |
rfield@1380 | 249 | //then, determine the arguments to the indy call |
rfield@1380 | 250 | List<JCExpression> indy_args = translate(syntheticInits.toList(), localContext.prev); |
rfield@1380 | 251 | |
rfield@1380 | 252 | //build a sam instance using an indy call to the meta-factory |
rfield@1380 | 253 | int refKind = referenceKind(sym); |
rfield@1380 | 254 | |
rfield@1380 | 255 | //convert to an invokedynamic call |
rfield@1380 | 256 | result = makeMetaFactoryIndyCall(tree, tree.targetType, refKind, sym, indy_args); |
rfield@1380 | 257 | } |
rfield@1380 | 258 | |
rfield@1380 | 259 | private JCIdent makeThis(Type type, Symbol owner) { |
rfield@1380 | 260 | VarSymbol _this = new VarSymbol(PARAMETER | FINAL | SYNTHETIC, |
rfield@1380 | 261 | names._this, |
rfield@1380 | 262 | type, |
rfield@1380 | 263 | owner); |
rfield@1380 | 264 | return make.Ident(_this); |
rfield@1380 | 265 | } |
rfield@1380 | 266 | |
rfield@1380 | 267 | /** |
rfield@1380 | 268 | * Translate a method reference into an invokedynamic call to the |
rfield@1380 | 269 | * meta-factory. |
rfield@1380 | 270 | * @param tree |
rfield@1380 | 271 | */ |
rfield@1380 | 272 | @Override |
rfield@1380 | 273 | public void visitReference(JCMemberReference tree) { |
rfield@1380 | 274 | ReferenceTranslationContext localContext = (ReferenceTranslationContext)context; |
rfield@1380 | 275 | |
rfield@1380 | 276 | //first determine the method symbol to be used to generate the sam instance |
rfield@1380 | 277 | //this is either the method reference symbol, or the bridged reference symbol |
rfield@1380 | 278 | Symbol refSym = localContext.needsBridge() ? |
rfield@1380 | 279 | localContext.bridgeSym : |
rfield@1380 | 280 | tree.sym; |
rfield@1380 | 281 | |
rfield@1380 | 282 | //build the bridge method, if needed |
rfield@1380 | 283 | if (localContext.needsBridge()) { |
rfield@1380 | 284 | bridgeMemberReference(tree, localContext); |
rfield@1380 | 285 | } |
rfield@1380 | 286 | |
rfield@1380 | 287 | //the qualifying expression is treated as a special captured arg |
rfield@1380 | 288 | JCExpression init; |
rfield@1380 | 289 | switch(tree.kind) { |
rfield@1380 | 290 | |
rfield@1380 | 291 | case IMPLICIT_INNER: /** Inner # new */ |
rfield@1380 | 292 | case SUPER: /** super # instMethod */ |
rfield@1380 | 293 | init = makeThis( |
rfield@1380 | 294 | localContext.owner.owner.asType(), |
rfield@1380 | 295 | localContext.owner); |
rfield@1380 | 296 | break; |
rfield@1380 | 297 | |
rfield@1380 | 298 | case BOUND: /** Expr # instMethod */ |
rfield@1380 | 299 | init = tree.getQualifierExpression(); |
rfield@1380 | 300 | break; |
rfield@1380 | 301 | |
rfield@1380 | 302 | case STATIC_EVAL: /** Expr # staticMethod */ |
rfield@1380 | 303 | case UNBOUND: /** Type # instMethod */ |
rfield@1380 | 304 | case STATIC: /** Type # staticMethod */ |
rfield@1380 | 305 | case TOPLEVEL: /** Top level # new */ |
rfield@1380 | 306 | init = null; |
rfield@1380 | 307 | break; |
rfield@1380 | 308 | |
rfield@1380 | 309 | default: |
rfield@1380 | 310 | throw new InternalError("Should not have an invalid kind"); |
rfield@1380 | 311 | } |
rfield@1380 | 312 | |
rfield@1380 | 313 | List<JCExpression> indy_args = init==null? List.<JCExpression>nil() : translate(List.of(init), localContext.prev); |
rfield@1380 | 314 | |
rfield@1380 | 315 | |
rfield@1380 | 316 | //build a sam instance using an indy call to the meta-factory |
rfield@1380 | 317 | result = makeMetaFactoryIndyCall(tree, tree.targetType, localContext.referenceKind(), refSym, indy_args); |
rfield@1380 | 318 | |
rfield@1380 | 319 | //if we had a static reference with non-static qualifier, add a let |
rfield@1380 | 320 | //expression to force the evaluation of the qualifier expr |
rfield@1380 | 321 | if (tree.hasKind(ReferenceKind.STATIC_EVAL)) { |
rfield@1380 | 322 | VarSymbol rec = new VarSymbol(0, names.fromString("rec$"), tree.getQualifierExpression().type, localContext.owner); |
rfield@1380 | 323 | JCVariableDecl recDef = make.VarDef(rec, tree.getQualifierExpression()); |
rfield@1380 | 324 | result = make.LetExpr(recDef, result).setType(tree.type); |
rfield@1380 | 325 | } |
rfield@1380 | 326 | } |
rfield@1380 | 327 | |
rfield@1380 | 328 | /** |
rfield@1380 | 329 | * Translate identifiers within a lambda to the mapped identifier |
rfield@1380 | 330 | * @param tree |
rfield@1380 | 331 | */ |
rfield@1380 | 332 | @Override |
rfield@1380 | 333 | public void visitIdent(JCIdent tree) { |
rfield@1380 | 334 | if (context == null || !analyzer.lambdaIdentSymbolFilter(tree.sym)) { |
rfield@1380 | 335 | super.visitIdent(tree); |
rfield@1380 | 336 | } else { |
rfield@1380 | 337 | LambdaTranslationContext lambdaContext = (LambdaTranslationContext) context; |
rfield@1380 | 338 | if (lambdaContext.getSymbolMap(PARAM).containsKey(tree.sym)) { |
rfield@1380 | 339 | Symbol translatedSym = lambdaContext.getSymbolMap(PARAM).get(tree.sym); |
rfield@1380 | 340 | result = make.Ident(translatedSym).setType(tree.type); |
rfield@1380 | 341 | } else if (lambdaContext.getSymbolMap(LOCAL_VAR).containsKey(tree.sym)) { |
rfield@1380 | 342 | Symbol translatedSym = lambdaContext.getSymbolMap(LOCAL_VAR).get(tree.sym); |
rfield@1380 | 343 | result = make.Ident(translatedSym).setType(tree.type); |
rfield@1380 | 344 | } else if (lambdaContext.getSymbolMap(CAPTURED_VAR).containsKey(tree.sym)) { |
rfield@1380 | 345 | Symbol translatedSym = lambdaContext.getSymbolMap(CAPTURED_VAR).get(tree.sym); |
rfield@1380 | 346 | result = make.Ident(translatedSym).setType(tree.type); |
rfield@1380 | 347 | } else { |
rfield@1380 | 348 | if (tree.sym.owner.kind == Kinds.TYP) { |
rfield@1380 | 349 | for (Map.Entry<Symbol, Symbol> encl_entry : lambdaContext.getSymbolMap(CAPTURED_THIS).entrySet()) { |
rfield@1380 | 350 | if (tree.sym.isMemberOf((ClassSymbol) encl_entry.getKey(), types)) { |
rfield@1380 | 351 | JCExpression enclRef = make.Ident(encl_entry.getValue()); |
rfield@1380 | 352 | result = tree.sym.name == names._this |
rfield@1380 | 353 | ? enclRef.setType(tree.type) |
rfield@1380 | 354 | : make.Select(enclRef, tree.sym).setType(tree.type); |
rfield@1380 | 355 | result = tree; |
rfield@1380 | 356 | return; |
rfield@1380 | 357 | } |
rfield@1380 | 358 | } |
rfield@1380 | 359 | } |
rfield@1380 | 360 | //access to untranslated symbols (i.e. compile-time constants, |
rfield@1380 | 361 | //members defined inside the lambda body, etc.) ) |
rfield@1380 | 362 | super.visitIdent(tree); |
rfield@1380 | 363 | } |
rfield@1380 | 364 | } |
rfield@1380 | 365 | } |
rfield@1380 | 366 | |
rfield@1380 | 367 | @Override |
rfield@1380 | 368 | public void visitVarDef(JCVariableDecl tree) { |
rfield@1380 | 369 | LambdaTranslationContext lambdaContext = (LambdaTranslationContext)context; |
rfield@1380 | 370 | if (context != null && lambdaContext.getSymbolMap(LOCAL_VAR).containsKey(tree.sym)) { |
rfield@1380 | 371 | JCExpression init = translate(tree.init); |
rfield@1380 | 372 | result = make.VarDef((VarSymbol)lambdaContext.getSymbolMap(LOCAL_VAR).get(tree.sym), init); |
rfield@1380 | 373 | } else { |
rfield@1380 | 374 | super.visitVarDef(tree); |
rfield@1380 | 375 | } |
rfield@1380 | 376 | } |
rfield@1380 | 377 | |
rfield@1380 | 378 | // </editor-fold> |
rfield@1380 | 379 | |
rfield@1380 | 380 | // <editor-fold defaultstate="collapsed" desc="Translation helper methods"> |
rfield@1380 | 381 | |
rfield@1380 | 382 | private JCBlock makeLambdaBody(JCLambda tree, JCMethodDecl lambdaMethodDecl) { |
rfield@1380 | 383 | return tree.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? |
rfield@1380 | 384 | makeLambdaExpressionBody((JCExpression)tree.body, lambdaMethodDecl) : |
rfield@1380 | 385 | makeLambdaStatementBody((JCBlock)tree.body, lambdaMethodDecl, tree.canCompleteNormally); |
rfield@1380 | 386 | } |
rfield@1380 | 387 | |
rfield@1380 | 388 | private JCBlock makeLambdaExpressionBody(JCExpression expr, JCMethodDecl lambdaMethodDecl) { |
rfield@1380 | 389 | Type restype = lambdaMethodDecl.type.getReturnType(); |
rfield@1380 | 390 | boolean isLambda_void = expr.type.hasTag(VOID); |
rfield@1380 | 391 | boolean isTarget_void = restype.hasTag(VOID); |
rfield@1380 | 392 | boolean isTarget_Void = types.isSameType(restype, types.boxedClass(syms.voidType).type); |
rfield@1380 | 393 | if (isTarget_void) { |
rfield@1380 | 394 | //target is void: |
rfield@1380 | 395 | // BODY; |
rfield@1380 | 396 | JCStatement stat = make.Exec(expr); |
rfield@1380 | 397 | return make.Block(0, List.<JCStatement>of(stat)); |
rfield@1380 | 398 | } else if (isLambda_void && isTarget_Void) { |
rfield@1380 | 399 | //void to Void conversion: |
rfield@1380 | 400 | // BODY; return null; |
rfield@1380 | 401 | ListBuffer<JCStatement> stats = ListBuffer.lb(); |
rfield@1380 | 402 | stats.append(make.Exec(expr)); |
rfield@1380 | 403 | stats.append(make.Return(make.Literal(BOT, null).setType(syms.botType))); |
rfield@1380 | 404 | return make.Block(0, stats.toList()); |
rfield@1380 | 405 | } else { |
rfield@1380 | 406 | //non-void to non-void conversion: |
rfield@1380 | 407 | // return (TYPE)BODY; |
rfield@1380 | 408 | JCExpression retExpr = transTypes.coerce(attrEnv, expr, restype); |
rfield@1380 | 409 | return make.Block(0, List.<JCStatement>of(make.Return(retExpr))); |
rfield@1380 | 410 | } |
rfield@1380 | 411 | } |
rfield@1380 | 412 | |
rfield@1380 | 413 | private JCBlock makeLambdaStatementBody(JCBlock block, final JCMethodDecl lambdaMethodDecl, boolean completeNormally) { |
rfield@1380 | 414 | final Type restype = lambdaMethodDecl.type.getReturnType(); |
rfield@1380 | 415 | final boolean isTarget_void = restype.hasTag(VOID); |
rfield@1380 | 416 | boolean isTarget_Void = types.isSameType(restype, types.boxedClass(syms.voidType).type); |
rfield@1380 | 417 | |
rfield@1380 | 418 | class LambdaBodyTranslator extends TreeTranslator { |
rfield@1380 | 419 | |
rfield@1380 | 420 | @Override |
rfield@1380 | 421 | public void visitClassDef(JCClassDecl tree) { |
rfield@1380 | 422 | //do NOT recurse on any inner classes |
rfield@1380 | 423 | result = tree; |
rfield@1380 | 424 | } |
rfield@1380 | 425 | |
rfield@1380 | 426 | @Override |
rfield@1380 | 427 | public void visitLambda(JCLambda tree) { |
rfield@1380 | 428 | //do NOT recurse on any nested lambdas |
rfield@1380 | 429 | result = tree; |
rfield@1380 | 430 | } |
rfield@1380 | 431 | |
rfield@1380 | 432 | @Override |
rfield@1380 | 433 | public void visitReturn(JCReturn tree) { |
rfield@1380 | 434 | boolean isLambda_void = tree.expr == null; |
rfield@1380 | 435 | if (isTarget_void && !isLambda_void) { |
rfield@1380 | 436 | //Void to void conversion: |
rfield@1380 | 437 | // { TYPE $loc = RET-EXPR; return; } |
rfield@1380 | 438 | VarSymbol loc = makeSyntheticVar(0, names.fromString("$loc"), tree.expr.type, lambdaMethodDecl.sym); |
rfield@1380 | 439 | JCVariableDecl varDef = make.VarDef(loc, tree.expr); |
rfield@1380 | 440 | result = make.Block(0, List.<JCStatement>of(varDef, make.Return(null))); |
rfield@1380 | 441 | } else if (!isTarget_void || !isLambda_void) { |
rfield@1380 | 442 | //non-void to non-void conversion: |
rfield@1380 | 443 | // return (TYPE)RET-EXPR; |
rfield@1380 | 444 | tree.expr = transTypes.coerce(attrEnv, tree.expr, restype); |
rfield@1380 | 445 | result = tree; |
rfield@1380 | 446 | } else { |
rfield@1380 | 447 | result = tree; |
rfield@1380 | 448 | } |
rfield@1380 | 449 | |
rfield@1380 | 450 | } |
rfield@1380 | 451 | } |
rfield@1380 | 452 | |
rfield@1380 | 453 | JCBlock trans_block = new LambdaBodyTranslator().translate(block); |
rfield@1380 | 454 | if (completeNormally && isTarget_Void) { |
rfield@1380 | 455 | //there's no return statement and the lambda (possibly inferred) |
rfield@1380 | 456 | //return type is java.lang.Void; emit a synthetic return statement |
rfield@1380 | 457 | trans_block.stats = trans_block.stats.append(make.Return(make.Literal(BOT, null).setType(syms.botType))); |
rfield@1380 | 458 | } |
rfield@1380 | 459 | return trans_block; |
rfield@1380 | 460 | } |
rfield@1380 | 461 | |
rfield@1380 | 462 | /** |
rfield@1380 | 463 | * Create new synthetic method with given flags, name, type, owner |
rfield@1380 | 464 | */ |
rfield@1380 | 465 | private MethodSymbol makeSyntheticMethod(long flags, Name name, Type type, Symbol owner) { |
rfield@1380 | 466 | return new MethodSymbol(flags | SYNTHETIC, name, type, owner); |
rfield@1380 | 467 | } |
rfield@1380 | 468 | |
rfield@1380 | 469 | /** |
rfield@1380 | 470 | * Create new synthetic variable with given flags, name, type, owner |
rfield@1380 | 471 | */ |
rfield@1380 | 472 | private VarSymbol makeSyntheticVar(long flags, String name, Type type, Symbol owner) { |
rfield@1380 | 473 | return makeSyntheticVar(flags, names.fromString(name), type, owner); |
rfield@1380 | 474 | } |
rfield@1380 | 475 | |
rfield@1380 | 476 | /** |
rfield@1380 | 477 | * Create new synthetic variable with given flags, name, type, owner |
rfield@1380 | 478 | */ |
rfield@1380 | 479 | private VarSymbol makeSyntheticVar(long flags, Name name, Type type, Symbol owner) { |
rfield@1380 | 480 | return new VarSymbol(flags | SYNTHETIC, name, type, owner); |
rfield@1380 | 481 | } |
rfield@1380 | 482 | |
rfield@1380 | 483 | /** |
rfield@1380 | 484 | * Set varargsElement field on a given tree (must be either a new class tree |
rfield@1380 | 485 | * or a method call tree) |
rfield@1380 | 486 | */ |
rfield@1380 | 487 | private void setVarargsIfNeeded(JCTree tree, Type varargsElement) { |
rfield@1380 | 488 | if (varargsElement != null) { |
rfield@1380 | 489 | switch (tree.getTag()) { |
rfield@1380 | 490 | case APPLY: ((JCMethodInvocation)tree).varargsElement = varargsElement; break; |
rfield@1380 | 491 | case NEWCLASS: ((JCNewClass)tree).varargsElement = varargsElement; break; |
rfield@1380 | 492 | default: throw new AssertionError(); |
rfield@1380 | 493 | } |
rfield@1380 | 494 | } |
rfield@1380 | 495 | } |
rfield@1380 | 496 | |
rfield@1380 | 497 | /** |
rfield@1380 | 498 | * Convert method/constructor arguments by inserting appropriate cast |
rfield@1380 | 499 | * as required by type-erasure - this is needed when bridging a lambda/method |
rfield@1380 | 500 | * reference, as the bridged signature might require downcast to be compatible |
rfield@1380 | 501 | * with the generated signature. |
rfield@1380 | 502 | */ |
rfield@1380 | 503 | private List<JCExpression> convertArgs(Symbol meth, List<JCExpression> args, Type varargsElement) { |
rfield@1380 | 504 | Assert.check(meth.kind == Kinds.MTH); |
rfield@1380 | 505 | List<Type> formals = types.erasure(meth.type).getParameterTypes(); |
rfield@1380 | 506 | if (varargsElement != null) { |
rfield@1380 | 507 | Assert.check((meth.flags() & VARARGS) != 0); |
rfield@1380 | 508 | } |
rfield@1380 | 509 | return transTypes.translateArgs(args, formals, varargsElement, attrEnv); |
rfield@1380 | 510 | } |
rfield@1380 | 511 | |
rfield@1380 | 512 | // </editor-fold> |
rfield@1380 | 513 | |
rfield@1380 | 514 | private MethodSymbol makeSamDescriptor(Type targetType) { |
rfield@1380 | 515 | return (MethodSymbol)types.findDescriptorSymbol(targetType.tsym); |
rfield@1380 | 516 | } |
rfield@1380 | 517 | |
rfield@1380 | 518 | private Type makeFunctionalDescriptorType(Type targetType, MethodSymbol samDescriptor, boolean erased) { |
rfield@1380 | 519 | Type descType = types.memberType(targetType, samDescriptor); |
rfield@1380 | 520 | return erased ? types.erasure(descType) : descType; |
rfield@1380 | 521 | } |
rfield@1380 | 522 | |
rfield@1380 | 523 | private Type makeFunctionalDescriptorType(Type targetType, boolean erased) { |
rfield@1380 | 524 | return makeFunctionalDescriptorType(targetType, makeSamDescriptor(targetType), erased); |
rfield@1380 | 525 | } |
rfield@1380 | 526 | |
rfield@1380 | 527 | /** |
rfield@1380 | 528 | * Generate an adapter method "bridge" for a method reference which cannot |
rfield@1380 | 529 | * be used directly. |
rfield@1380 | 530 | */ |
rfield@1380 | 531 | private class MemberReferenceBridger { |
rfield@1380 | 532 | |
rfield@1380 | 533 | private final JCMemberReference tree; |
rfield@1380 | 534 | private final ReferenceTranslationContext localContext; |
rfield@1380 | 535 | private final ListBuffer<JCExpression> args = ListBuffer.lb(); |
rfield@1380 | 536 | private final ListBuffer<JCVariableDecl> params = ListBuffer.lb(); |
rfield@1380 | 537 | |
rfield@1380 | 538 | MemberReferenceBridger(JCMemberReference tree, ReferenceTranslationContext localContext) { |
rfield@1380 | 539 | this.tree = tree; |
rfield@1380 | 540 | this.localContext = localContext; |
rfield@1380 | 541 | } |
rfield@1380 | 542 | |
rfield@1380 | 543 | /** |
rfield@1380 | 544 | * Generate the bridge |
rfield@1380 | 545 | */ |
rfield@1380 | 546 | JCMethodDecl bridge() { |
rfield@1380 | 547 | int prevPos = make.pos; |
rfield@1380 | 548 | try { |
rfield@1380 | 549 | make.at(tree); |
rfield@1380 | 550 | Type samDesc = localContext.bridgedRefSig(); |
rfield@1380 | 551 | List<Type> samPTypes = samDesc.getParameterTypes(); |
rfield@1380 | 552 | |
rfield@1380 | 553 | //an extra argument is prepended to the signature of the bridge in case |
rfield@1380 | 554 | //the member reference is an instance method reference (in which case |
rfield@1380 | 555 | //the receiver expression is passed to the bridge itself). |
rfield@1380 | 556 | Type recType = null; |
rfield@1380 | 557 | switch (tree.kind) { |
rfield@1380 | 558 | case IMPLICIT_INNER: |
rfield@1380 | 559 | recType = tree.sym.owner.type.getEnclosingType(); |
rfield@1380 | 560 | break; |
rfield@1380 | 561 | case BOUND: |
rfield@1380 | 562 | recType = tree.getQualifierExpression().type; |
rfield@1380 | 563 | break; |
rfield@1380 | 564 | case UNBOUND: |
rfield@1380 | 565 | recType = samPTypes.head; |
rfield@1380 | 566 | samPTypes = samPTypes.tail; |
rfield@1380 | 567 | break; |
rfield@1380 | 568 | } |
rfield@1380 | 569 | |
rfield@1380 | 570 | //generate the parameter list for the bridged member reference - the |
rfield@1380 | 571 | //bridge signature will match the signature of the target sam descriptor |
rfield@1380 | 572 | |
rfield@1380 | 573 | VarSymbol rcvr = (recType == null) |
rfield@1380 | 574 | ? null |
rfield@1380 | 575 | : addParameter("rec$", recType, false); |
rfield@1380 | 576 | |
rfield@1380 | 577 | List<Type> refPTypes = tree.sym.type.getParameterTypes(); |
rfield@1380 | 578 | int refSize = refPTypes.size(); |
rfield@1380 | 579 | int samSize = samPTypes.size(); |
rfield@1380 | 580 | int last = localContext.needsVarArgsConversion() ? refSize - 1 : refSize; // Last parameter to copy from referenced method |
rfield@1380 | 581 | |
rfield@1380 | 582 | List<Type> l = refPTypes; |
rfield@1380 | 583 | // Use parameter types of the referenced method, excluding final var args |
rfield@1380 | 584 | for (int i = 0; l.nonEmpty() && i < last; ++i) { |
rfield@1380 | 585 | addParameter("x$" + i, l.head, true); |
rfield@1380 | 586 | l = l.tail; |
rfield@1380 | 587 | } |
rfield@1380 | 588 | // Flatten out the var args |
rfield@1380 | 589 | for (int i = last; i < samSize; ++i) { |
rfield@1380 | 590 | addParameter("xva$" + i, tree.varargsElement, true); |
rfield@1380 | 591 | } |
rfield@1380 | 592 | |
rfield@1380 | 593 | //generate the bridge method declaration |
rfield@1380 | 594 | JCMethodDecl bridgeDecl = make.MethodDef(make.Modifiers(localContext.bridgeSym.flags()), |
rfield@1380 | 595 | localContext.bridgeSym.name, |
rfield@1380 | 596 | make.QualIdent(samDesc.getReturnType().tsym), |
rfield@1380 | 597 | List.<JCTypeParameter>nil(), |
rfield@1380 | 598 | params.toList(), |
rfield@1380 | 599 | tree.sym.type.getThrownTypes() == null |
rfield@1380 | 600 | ? List.<JCExpression>nil() |
rfield@1380 | 601 | : make.Types(tree.sym.type.getThrownTypes()), |
rfield@1380 | 602 | null, |
rfield@1380 | 603 | null); |
rfield@1380 | 604 | bridgeDecl.sym = (MethodSymbol) localContext.bridgeSym; |
rfield@1380 | 605 | bridgeDecl.type = localContext.bridgeSym.type = types.createMethodTypeWithParameters(samDesc, TreeInfo.types(params.toList())); |
rfield@1380 | 606 | |
rfield@1380 | 607 | //bridge method body generation - this can be either a method call or a |
rfield@1380 | 608 | //new instance creation expression, depending on the member reference kind |
rfield@1380 | 609 | JCExpression bridgeExpr = (tree.getMode() == ReferenceMode.INVOKE) |
rfield@1380 | 610 | ? bridgeExpressionInvoke(rcvr) |
rfield@1380 | 611 | : bridgeExpressionNew(); |
rfield@1380 | 612 | |
rfield@1380 | 613 | //the body is either a return expression containing a method call, |
rfield@1380 | 614 | //or the method call itself, depending on whether the return type of |
rfield@1380 | 615 | //the bridge is non-void/void. |
rfield@1380 | 616 | bridgeDecl.body = makeLambdaExpressionBody(bridgeExpr, bridgeDecl); |
rfield@1380 | 617 | |
rfield@1380 | 618 | return bridgeDecl; |
rfield@1380 | 619 | } finally { |
rfield@1380 | 620 | make.at(prevPos); |
rfield@1380 | 621 | } |
rfield@1380 | 622 | } |
rfield@1380 | 623 | |
rfield@1380 | 624 | /** |
rfield@1380 | 625 | * determine the receiver of the bridged method call - the receiver can |
rfield@1380 | 626 | * be either the synthetic receiver parameter or a type qualifier; the |
rfield@1380 | 627 | * original qualifier expression is never used here, as it might refer |
rfield@1380 | 628 | * to symbols not available in the static context of the bridge |
rfield@1380 | 629 | */ |
rfield@1380 | 630 | private JCExpression bridgeExpressionInvoke(VarSymbol rcvr) { |
rfield@1380 | 631 | JCExpression qualifier = |
rfield@1380 | 632 | tree.sym.isStatic() ? |
rfield@1380 | 633 | make.Type(tree.sym.owner.type) : |
rfield@1380 | 634 | (rcvr != null) ? |
rfield@1380 | 635 | make.Ident(rcvr) : |
rfield@1380 | 636 | tree.getQualifierExpression(); |
rfield@1380 | 637 | |
rfield@1380 | 638 | //create the qualifier expression |
rfield@1380 | 639 | JCFieldAccess select = make.Select(qualifier, tree.sym.name); |
rfield@1380 | 640 | select.sym = tree.sym; |
rfield@1380 | 641 | select.type = tree.sym.erasure(types); |
rfield@1380 | 642 | |
rfield@1380 | 643 | //create the method call expression |
rfield@1380 | 644 | JCExpression apply = make.Apply(List.<JCExpression>nil(), select, |
rfield@1380 | 645 | convertArgs(tree.sym, args.toList(), tree.varargsElement)).setType(tree.sym.erasure(types).getReturnType()); |
rfield@1380 | 646 | |
rfield@1380 | 647 | apply = transTypes.coerce(apply, localContext.generatedRefSig().getReturnType()); |
rfield@1380 | 648 | setVarargsIfNeeded(apply, tree.varargsElement); |
rfield@1380 | 649 | return apply; |
rfield@1380 | 650 | } |
rfield@1380 | 651 | |
rfield@1380 | 652 | /** |
rfield@1380 | 653 | * the enclosing expression is either 'null' (no enclosing type) or set |
rfield@1380 | 654 | * to the first bridge synthetic parameter |
rfield@1380 | 655 | */ |
rfield@1380 | 656 | private JCExpression bridgeExpressionNew() { |
rfield@1380 | 657 | JCExpression encl = null; |
rfield@1380 | 658 | switch (tree.kind) { |
rfield@1380 | 659 | case UNBOUND: |
rfield@1380 | 660 | case IMPLICIT_INNER: |
rfield@1380 | 661 | encl = make.Ident(params.first()); |
rfield@1380 | 662 | } |
rfield@1380 | 663 | |
rfield@1380 | 664 | //create the instance creation expression |
rfield@1380 | 665 | JCNewClass newClass = make.NewClass(encl, |
rfield@1380 | 666 | List.<JCExpression>nil(), |
rfield@1380 | 667 | make.Type(tree.getQualifierExpression().type), |
rfield@1380 | 668 | convertArgs(tree.sym, args.toList(), tree.varargsElement), |
rfield@1380 | 669 | null); |
rfield@1380 | 670 | newClass.constructor = tree.sym; |
rfield@1380 | 671 | newClass.constructorType = tree.sym.erasure(types); |
rfield@1380 | 672 | newClass.type = tree.getQualifierExpression().type; |
rfield@1380 | 673 | setVarargsIfNeeded(newClass, tree.varargsElement); |
rfield@1380 | 674 | return newClass; |
rfield@1380 | 675 | } |
rfield@1380 | 676 | |
rfield@1380 | 677 | private VarSymbol addParameter(String name, Type p, boolean genArg) { |
rfield@1380 | 678 | VarSymbol vsym = new VarSymbol(0, names.fromString(name), p, localContext.bridgeSym); |
rfield@1380 | 679 | params.append(make.VarDef(vsym, null)); |
rfield@1380 | 680 | if (genArg) { |
rfield@1380 | 681 | args.append(make.Ident(vsym)); |
rfield@1380 | 682 | } |
rfield@1380 | 683 | return vsym; |
rfield@1380 | 684 | } |
rfield@1380 | 685 | } |
rfield@1380 | 686 | |
rfield@1380 | 687 | /** |
rfield@1380 | 688 | * Bridges a member reference - this is needed when: |
rfield@1380 | 689 | * * Var args in the referenced method need to be flattened away |
rfield@1380 | 690 | * * super is used |
rfield@1380 | 691 | */ |
rfield@1380 | 692 | private void bridgeMemberReference(JCMemberReference tree, ReferenceTranslationContext localContext) { |
rfield@1380 | 693 | JCMethodDecl bridgeDecl = (new MemberReferenceBridger(tree, localContext).bridge()); |
rfield@1380 | 694 | translatedMethodList = translatedMethodList.prepend(bridgeDecl); |
rfield@1380 | 695 | } |
rfield@1380 | 696 | |
rfield@1380 | 697 | /** |
rfield@1380 | 698 | * Generate an indy method call to the meta factory |
rfield@1380 | 699 | */ |
rfield@1380 | 700 | private JCExpression makeMetaFactoryIndyCall(JCExpression tree, Type targetType, int refKind, Symbol refSym, List<JCExpression> indy_args) { |
rfield@1380 | 701 | //determine the static bsm args |
rfield@1380 | 702 | Type mtype = makeFunctionalDescriptorType(targetType, true); |
rfield@1380 | 703 | List<Object> staticArgs = List.<Object>of( |
rfield@1380 | 704 | new Pool.MethodHandle(ClassFile.REF_invokeInterface, types.findDescriptorSymbol(targetType.tsym)), |
rfield@1380 | 705 | new Pool.MethodHandle(refKind, refSym), |
rfield@1380 | 706 | new MethodType(mtype.getParameterTypes(), |
rfield@1380 | 707 | mtype.getReturnType(), |
rfield@1380 | 708 | mtype.getThrownTypes(), |
rfield@1380 | 709 | syms.methodClass)); |
rfield@1380 | 710 | |
rfield@1380 | 711 | //computed indy arg types |
rfield@1380 | 712 | ListBuffer<Type> indy_args_types = ListBuffer.lb(); |
rfield@1380 | 713 | for (JCExpression arg : indy_args) { |
rfield@1380 | 714 | indy_args_types.append(arg.type); |
rfield@1380 | 715 | } |
rfield@1380 | 716 | |
rfield@1380 | 717 | //finally, compute the type of the indy call |
rfield@1380 | 718 | MethodType indyType = new MethodType(indy_args_types.toList(), |
rfield@1380 | 719 | tree.type, |
rfield@1380 | 720 | List.<Type>nil(), |
rfield@1380 | 721 | syms.methodClass); |
rfield@1380 | 722 | |
rfield@1380 | 723 | return makeIndyCall(tree, syms.lambdaMetafactory, names.metaFactory, staticArgs, indyType, indy_args); |
rfield@1380 | 724 | } |
rfield@1380 | 725 | |
rfield@1380 | 726 | /** |
rfield@1380 | 727 | * Generate an indy method call with given name, type and static bootstrap |
rfield@1380 | 728 | * arguments types |
rfield@1380 | 729 | */ |
rfield@1380 | 730 | private JCExpression makeIndyCall(DiagnosticPosition pos, Type site, Name bsmName, List<Object> staticArgs, MethodType indyType, List<JCExpression> indyArgs) { |
rfield@1380 | 731 | int prevPos = make.pos; |
rfield@1380 | 732 | try { |
rfield@1380 | 733 | make.at(pos); |
rfield@1380 | 734 | List<Type> bsm_staticArgs = List.of(syms.methodHandleLookupType, |
rfield@1380 | 735 | syms.stringType, |
rfield@1380 | 736 | syms.methodTypeType).appendList(bsmStaticArgToTypes(staticArgs)); |
rfield@1380 | 737 | |
rfield@1380 | 738 | Symbol bsm = rs.resolveInternalMethod(pos, attrEnv, site, |
rfield@1380 | 739 | bsmName, bsm_staticArgs, List.<Type>nil()); |
rfield@1380 | 740 | |
rfield@1380 | 741 | DynamicMethodSymbol dynSym = |
rfield@1380 | 742 | new DynamicMethodSymbol(names.lambda, |
rfield@1380 | 743 | syms.noSymbol, |
rfield@1380 | 744 | bsm.isStatic() ? ClassFile.REF_invokeStatic : ClassFile.REF_invokeVirtual, |
rfield@1380 | 745 | (MethodSymbol)bsm, |
rfield@1380 | 746 | indyType, |
rfield@1380 | 747 | staticArgs.toArray()); |
rfield@1380 | 748 | |
rfield@1380 | 749 | JCFieldAccess qualifier = make.Select(make.QualIdent(site.tsym), bsmName); |
rfield@1380 | 750 | qualifier.sym = dynSym; |
rfield@1380 | 751 | qualifier.type = indyType.getReturnType(); |
rfield@1380 | 752 | |
rfield@1380 | 753 | JCMethodInvocation proxyCall = make.Apply(List.<JCExpression>nil(), qualifier, indyArgs); |
rfield@1380 | 754 | proxyCall.type = indyType.getReturnType(); |
rfield@1380 | 755 | return proxyCall; |
rfield@1380 | 756 | } finally { |
rfield@1380 | 757 | make.at(prevPos); |
rfield@1380 | 758 | } |
rfield@1380 | 759 | } |
rfield@1380 | 760 | //where |
rfield@1380 | 761 | private List<Type> bsmStaticArgToTypes(List<Object> args) { |
rfield@1380 | 762 | ListBuffer<Type> argtypes = ListBuffer.lb(); |
rfield@1380 | 763 | for (Object arg : args) { |
rfield@1380 | 764 | argtypes.append(bsmStaticArgToType(arg)); |
rfield@1380 | 765 | } |
rfield@1380 | 766 | return argtypes.toList(); |
rfield@1380 | 767 | } |
rfield@1380 | 768 | |
rfield@1380 | 769 | private Type bsmStaticArgToType(Object arg) { |
rfield@1380 | 770 | Assert.checkNonNull(arg); |
rfield@1380 | 771 | if (arg instanceof ClassSymbol) { |
rfield@1380 | 772 | return syms.classType; |
rfield@1380 | 773 | } else if (arg instanceof Integer) { |
rfield@1380 | 774 | return syms.intType; |
rfield@1380 | 775 | } else if (arg instanceof Long) { |
rfield@1380 | 776 | return syms.longType; |
rfield@1380 | 777 | } else if (arg instanceof Float) { |
rfield@1380 | 778 | return syms.floatType; |
rfield@1380 | 779 | } else if (arg instanceof Double) { |
rfield@1380 | 780 | return syms.doubleType; |
rfield@1380 | 781 | } else if (arg instanceof String) { |
rfield@1380 | 782 | return syms.stringType; |
rfield@1380 | 783 | } else if (arg instanceof Pool.MethodHandle) { |
rfield@1380 | 784 | return syms.methodHandleType; |
rfield@1380 | 785 | } else if (arg instanceof MethodType) { |
rfield@1380 | 786 | return syms.methodTypeType; |
rfield@1380 | 787 | } else { |
rfield@1380 | 788 | Assert.error("bad static arg " + arg.getClass()); |
rfield@1380 | 789 | return null; |
rfield@1380 | 790 | } |
rfield@1380 | 791 | } |
rfield@1380 | 792 | |
rfield@1380 | 793 | /** |
rfield@1380 | 794 | * Get the opcode associated with this method reference |
rfield@1380 | 795 | */ |
rfield@1380 | 796 | private int referenceKind(Symbol refSym) { |
rfield@1380 | 797 | if (refSym.isConstructor()) { |
rfield@1380 | 798 | return ClassFile.REF_newInvokeSpecial; |
rfield@1380 | 799 | } else { |
rfield@1380 | 800 | if (refSym.isStatic()) { |
rfield@1380 | 801 | return ClassFile.REF_invokeStatic; |
rfield@1380 | 802 | } else if (refSym.enclClass().isInterface()) { |
rfield@1380 | 803 | return ClassFile.REF_invokeInterface; |
rfield@1380 | 804 | } else { |
rfield@1380 | 805 | return ClassFile.REF_invokeVirtual; |
rfield@1380 | 806 | } |
rfield@1380 | 807 | } |
rfield@1380 | 808 | } |
rfield@1380 | 809 | // </editor-fold> |
rfield@1380 | 810 | |
rfield@1380 | 811 | // <editor-fold defaultstate="collapsed" desc="Lambda/reference analyzer">\ |
rfield@1380 | 812 | /** |
rfield@1380 | 813 | * This visitor collects information about translation of a lambda expression. |
rfield@1380 | 814 | * More specifically, it keeps track of the enclosing contexts and captured locals |
rfield@1380 | 815 | * accessed by the lambda being translated (as well as other useful info). |
rfield@1380 | 816 | */ |
rfield@1380 | 817 | class LambdaAnalyzer extends TreeScanner { |
rfield@1380 | 818 | |
rfield@1380 | 819 | /** the frame stack - used to reconstruct translation info about enclosing scopes */ |
rfield@1380 | 820 | private List<Frame> frameStack; |
rfield@1380 | 821 | |
rfield@1380 | 822 | /** |
rfield@1380 | 823 | * keep the count of lambda expression (used to generate unambiguous |
rfield@1380 | 824 | * names) |
rfield@1380 | 825 | */ |
rfield@1380 | 826 | private int lambdaCount = 0; |
rfield@1380 | 827 | |
rfield@1380 | 828 | private void analyzeClass(JCClassDecl tree) { |
rfield@1380 | 829 | frameStack = List.nil(); |
rfield@1380 | 830 | scan(tree); |
rfield@1380 | 831 | } |
rfield@1380 | 832 | |
rfield@1380 | 833 | @Override |
rfield@1380 | 834 | public void visitBlock(JCBlock tree) { |
rfield@1380 | 835 | List<Frame> prevStack = frameStack; |
rfield@1380 | 836 | try { |
rfield@1380 | 837 | if (frameStack.nonEmpty() && frameStack.head.tree.hasTag(CLASSDEF)) { |
rfield@1380 | 838 | frameStack = frameStack.prepend(new Frame(tree)); |
rfield@1380 | 839 | } |
rfield@1380 | 840 | super.visitBlock(tree); |
rfield@1380 | 841 | } |
rfield@1380 | 842 | finally { |
rfield@1380 | 843 | frameStack = prevStack; |
rfield@1380 | 844 | } |
rfield@1380 | 845 | } |
rfield@1380 | 846 | |
rfield@1380 | 847 | @Override |
rfield@1380 | 848 | public void visitClassDef(JCClassDecl tree) { |
rfield@1380 | 849 | List<Frame> prevStack = frameStack; |
rfield@1380 | 850 | try { |
rfield@1380 | 851 | if (frameStack.nonEmpty() && enclosingLambda() != null) { |
rfield@1380 | 852 | tree.sym.owner = owner(); |
rfield@1380 | 853 | LambdaTranslationContext lambdaContext = (LambdaTranslationContext)contextMap.get(enclosingLambda()); |
rfield@1380 | 854 | Type encl = lambdaContext.enclosingType(); |
rfield@1380 | 855 | if (encl.hasTag(NONE)) { |
rfield@1380 | 856 | //if the translated lambda body occurs in a static context, |
rfield@1380 | 857 | //any class declaration within it must be made static |
rfield@1380 | 858 | tree.sym.flags_field |= STATIC; |
rfield@1380 | 859 | ((ClassType)tree.sym.type).setEnclosingType(Type.noType); |
rfield@1380 | 860 | } else { |
rfield@1380 | 861 | //if the translated lambda body is in an instance context |
rfield@1380 | 862 | //the enclosing type of any class declaration within it |
rfield@1380 | 863 | //must be updated to point to the new enclosing type (if any) |
rfield@1380 | 864 | ((ClassType)tree.sym.type).setEnclosingType(encl); |
rfield@1380 | 865 | } |
rfield@1380 | 866 | } |
rfield@1380 | 867 | frameStack = frameStack.prepend(new Frame(tree)); |
rfield@1380 | 868 | super.visitClassDef(tree); |
rfield@1380 | 869 | } |
rfield@1380 | 870 | finally { |
rfield@1380 | 871 | frameStack = prevStack; |
rfield@1380 | 872 | } |
rfield@1380 | 873 | if (frameStack.nonEmpty() && enclosingLambda() != null) { |
rfield@1380 | 874 | // Any class defined within a lambda is an implicit 'this' reference |
rfield@1380 | 875 | // because its constructor will reference the enclosing class |
rfield@1380 | 876 | ((LambdaTranslationContext) context()).addSymbol(tree.sym.type.getEnclosingType().tsym, CAPTURED_THIS); |
rfield@1380 | 877 | } |
rfield@1380 | 878 | } |
rfield@1380 | 879 | |
rfield@1380 | 880 | @Override |
rfield@1380 | 881 | public void visitIdent(JCIdent tree) { |
rfield@1380 | 882 | if (context() == null || !lambdaIdentSymbolFilter(tree.sym)) { |
rfield@1380 | 883 | super.visitIdent(tree); |
rfield@1380 | 884 | } else { |
rfield@1380 | 885 | if (tree.sym.kind == VAR && |
rfield@1380 | 886 | tree.sym.owner.kind == MTH && |
rfield@1380 | 887 | tree.type.constValue() == null) { |
rfield@1380 | 888 | TranslationContext<?> localContext = context(); |
rfield@1380 | 889 | while (localContext != null) { |
rfield@1380 | 890 | if (localContext.tree.getTag() == LAMBDA) { |
rfield@1380 | 891 | JCTree block = capturedDecl(localContext.depth, tree.sym); |
rfield@1380 | 892 | if (block == null) break; |
rfield@1380 | 893 | ((LambdaTranslationContext)localContext).addSymbol(tree.sym, CAPTURED_VAR); |
rfield@1380 | 894 | } |
rfield@1380 | 895 | localContext = localContext.prev; |
rfield@1380 | 896 | } |
rfield@1380 | 897 | } else if (tree.sym.owner.kind == TYP) { |
rfield@1380 | 898 | TranslationContext<?> localContext = context(); |
rfield@1380 | 899 | while (localContext != null) { |
rfield@1380 | 900 | if (localContext.tree.hasTag(LAMBDA)) { |
rfield@1380 | 901 | JCTree block = capturedDecl(localContext.depth, tree.sym); |
rfield@1380 | 902 | if (block == null) break; |
rfield@1380 | 903 | switch (block.getTag()) { |
rfield@1380 | 904 | case CLASSDEF: |
rfield@1380 | 905 | JCClassDecl cdecl = (JCClassDecl)block; |
rfield@1380 | 906 | ((LambdaTranslationContext)localContext).addSymbol(cdecl.sym, CAPTURED_THIS); |
rfield@1380 | 907 | break; |
rfield@1380 | 908 | default: |
rfield@1380 | 909 | Assert.error("bad block kind"); |
rfield@1380 | 910 | } |
rfield@1380 | 911 | } |
rfield@1380 | 912 | localContext = localContext.prev; |
rfield@1380 | 913 | } |
rfield@1380 | 914 | } |
rfield@1380 | 915 | } |
rfield@1380 | 916 | } |
rfield@1380 | 917 | |
rfield@1380 | 918 | @Override |
rfield@1380 | 919 | public void visitLambda(JCLambda tree) { |
rfield@1380 | 920 | List<Frame> prevStack = frameStack; |
rfield@1380 | 921 | try { |
rfield@1380 | 922 | LambdaTranslationContext context = (LambdaTranslationContext)makeLambdaContext(tree); |
rfield@1380 | 923 | frameStack = frameStack.prepend(new Frame(tree)); |
rfield@1380 | 924 | for (JCVariableDecl param : tree.params) { |
rfield@1380 | 925 | context.addSymbol(param.sym, PARAM); |
rfield@1380 | 926 | frameStack.head.addLocal(param.sym); |
rfield@1380 | 927 | } |
rfield@1380 | 928 | contextMap.put(tree, context); |
rfield@1380 | 929 | scan(tree.body); |
rfield@1380 | 930 | context.complete(); |
rfield@1380 | 931 | } |
rfield@1380 | 932 | finally { |
rfield@1380 | 933 | frameStack = prevStack; |
rfield@1380 | 934 | } |
rfield@1380 | 935 | } |
rfield@1380 | 936 | |
rfield@1380 | 937 | @Override |
rfield@1380 | 938 | public void visitMethodDef(JCMethodDecl tree) { |
rfield@1380 | 939 | List<Frame> prevStack = frameStack; |
rfield@1380 | 940 | try { |
rfield@1380 | 941 | frameStack = frameStack.prepend(new Frame(tree)); |
rfield@1380 | 942 | super.visitMethodDef(tree); |
rfield@1380 | 943 | } |
rfield@1380 | 944 | finally { |
rfield@1380 | 945 | frameStack = prevStack; |
rfield@1380 | 946 | } |
rfield@1380 | 947 | } |
rfield@1380 | 948 | |
rfield@1380 | 949 | @Override |
rfield@1380 | 950 | public void visitNewClass(JCNewClass tree) { |
rfield@1380 | 951 | if (lambdaNewClassFilter(context(), tree)) { |
rfield@1380 | 952 | ((LambdaTranslationContext) context()).addSymbol(tree.type.getEnclosingType().tsym, CAPTURED_THIS); |
rfield@1380 | 953 | } |
rfield@1380 | 954 | super.visitNewClass(tree); |
rfield@1380 | 955 | } |
rfield@1380 | 956 | |
rfield@1380 | 957 | @Override |
rfield@1380 | 958 | public void visitReference(JCMemberReference tree) { |
rfield@1380 | 959 | scan(tree.getQualifierExpression()); |
rfield@1380 | 960 | contextMap.put(tree, makeReferenceContext(tree)); |
rfield@1380 | 961 | } |
rfield@1380 | 962 | |
rfield@1380 | 963 | @Override |
rfield@1380 | 964 | public void visitSelect(JCFieldAccess tree) { |
rfield@1380 | 965 | if (context() != null && lambdaSelectSymbolFilter(tree.sym)) { |
rfield@1380 | 966 | TranslationContext<?> localContext = context(); |
rfield@1380 | 967 | while (localContext != null) { |
rfield@1380 | 968 | if (localContext.tree.hasTag(LAMBDA)) { |
rfield@1380 | 969 | JCClassDecl clazz = (JCClassDecl)capturedDecl(localContext.depth, tree.sym); |
rfield@1380 | 970 | if (clazz == null) break; |
rfield@1380 | 971 | ((LambdaTranslationContext)localContext).addSymbol(clazz.sym, CAPTURED_THIS); |
rfield@1380 | 972 | } |
rfield@1380 | 973 | localContext = localContext.prev; |
rfield@1380 | 974 | } |
rfield@1380 | 975 | scan(tree.selected); |
rfield@1380 | 976 | } else { |
rfield@1380 | 977 | super.visitSelect(tree); |
rfield@1380 | 978 | } |
rfield@1380 | 979 | } |
rfield@1380 | 980 | |
rfield@1380 | 981 | @Override |
rfield@1380 | 982 | public void visitVarDef(JCVariableDecl tree) { |
rfield@1380 | 983 | if (frameStack.head.tree.hasTag(LAMBDA)) { |
rfield@1380 | 984 | ((LambdaTranslationContext)context()).addSymbol(tree.sym, LOCAL_VAR); |
rfield@1380 | 985 | } |
rfield@1380 | 986 | List<Frame> prevStack = frameStack; |
rfield@1380 | 987 | try { |
rfield@1380 | 988 | if (tree.sym.owner.kind == MTH) { |
rfield@1380 | 989 | frameStack.head.addLocal(tree.sym); |
rfield@1380 | 990 | } |
rfield@1380 | 991 | frameStack = frameStack.prepend(new Frame(tree)); |
rfield@1380 | 992 | super.visitVarDef(tree); |
rfield@1380 | 993 | } |
rfield@1380 | 994 | finally { |
rfield@1380 | 995 | frameStack = prevStack; |
rfield@1380 | 996 | } |
rfield@1380 | 997 | } |
rfield@1380 | 998 | |
rfield@1380 | 999 | private Name lambdaName() { |
rfield@1380 | 1000 | return names.lambda.append(names.fromString("$" + lambdaCount++)); |
rfield@1380 | 1001 | } |
rfield@1380 | 1002 | |
rfield@1380 | 1003 | /** |
rfield@1380 | 1004 | * Return a valid owner given the current declaration stack |
rfield@1380 | 1005 | * (required to skip synthetic lambda symbols) |
rfield@1380 | 1006 | */ |
rfield@1380 | 1007 | private Symbol owner() { |
rfield@1380 | 1008 | List<Frame> frameStack2 = frameStack; |
rfield@1380 | 1009 | while (frameStack2.nonEmpty()) { |
rfield@1380 | 1010 | switch (frameStack2.head.tree.getTag()) { |
rfield@1380 | 1011 | case VARDEF: |
rfield@1380 | 1012 | if (((JCVariableDecl)frameStack2.head.tree).sym.isLocal()) { |
rfield@1380 | 1013 | frameStack2 = frameStack2.tail; |
rfield@1380 | 1014 | break; |
rfield@1380 | 1015 | } |
rfield@1380 | 1016 | JCClassDecl cdecl = (JCClassDecl)frameStack2.tail.head.tree; |
rfield@1380 | 1017 | return makeSyntheticMethod(((JCVariableDecl)frameStack2.head.tree).sym.flags() & STATIC, names.empty, null, cdecl.sym); |
rfield@1380 | 1018 | case BLOCK: |
rfield@1380 | 1019 | JCClassDecl cdecl2 = (JCClassDecl)frameStack2.tail.head.tree; |
rfield@1380 | 1020 | return makeSyntheticMethod(((JCBlock)frameStack2.head.tree).flags & STATIC | Flags.BLOCK, names.empty, null, cdecl2.sym); |
rfield@1380 | 1021 | case CLASSDEF: |
rfield@1380 | 1022 | return ((JCClassDecl)frameStack2.head.tree).sym; |
rfield@1380 | 1023 | case METHODDEF: |
rfield@1380 | 1024 | return ((JCMethodDecl)frameStack2.head.tree).sym; |
rfield@1380 | 1025 | case LAMBDA: |
rfield@1380 | 1026 | return ((LambdaTranslationContext)contextMap.get(frameStack2.head.tree)).translatedSym; |
rfield@1380 | 1027 | default: |
rfield@1380 | 1028 | frameStack2 = frameStack2.tail; |
rfield@1380 | 1029 | } |
rfield@1380 | 1030 | } |
rfield@1380 | 1031 | Assert.error(); |
rfield@1380 | 1032 | return null; |
rfield@1380 | 1033 | } |
rfield@1380 | 1034 | |
rfield@1380 | 1035 | private JCTree enclosingLambda() { |
rfield@1380 | 1036 | List<Frame> frameStack2 = frameStack; |
rfield@1380 | 1037 | while (frameStack2.nonEmpty()) { |
rfield@1380 | 1038 | switch (frameStack2.head.tree.getTag()) { |
rfield@1380 | 1039 | case CLASSDEF: |
rfield@1380 | 1040 | case METHODDEF: |
rfield@1380 | 1041 | return null; |
rfield@1380 | 1042 | case LAMBDA: |
rfield@1380 | 1043 | return frameStack2.head.tree; |
rfield@1380 | 1044 | default: |
rfield@1380 | 1045 | frameStack2 = frameStack2.tail; |
rfield@1380 | 1046 | } |
rfield@1380 | 1047 | } |
rfield@1380 | 1048 | Assert.error(); |
rfield@1380 | 1049 | return null; |
rfield@1380 | 1050 | } |
rfield@1380 | 1051 | |
rfield@1380 | 1052 | /** |
rfield@1380 | 1053 | * Return the declaration corresponding to a symbol in the enclosing |
rfield@1380 | 1054 | * scope; the depth parameter is used to filter out symbols defined |
rfield@1380 | 1055 | * in nested scopes (which do not need to undergo capture). |
rfield@1380 | 1056 | */ |
rfield@1380 | 1057 | private JCTree capturedDecl(int depth, Symbol sym) { |
rfield@1380 | 1058 | int currentDepth = frameStack.size() - 1; |
rfield@1380 | 1059 | for (Frame block : frameStack) { |
rfield@1380 | 1060 | switch (block.tree.getTag()) { |
rfield@1380 | 1061 | case CLASSDEF: |
rfield@1380 | 1062 | ClassSymbol clazz = ((JCClassDecl)block.tree).sym; |
rfield@1380 | 1063 | if (sym.isMemberOf(clazz, types)) { |
rfield@1380 | 1064 | return currentDepth > depth ? null : block.tree; |
rfield@1380 | 1065 | } |
rfield@1380 | 1066 | break; |
rfield@1380 | 1067 | case VARDEF: |
rfield@1380 | 1068 | if (((JCVariableDecl)block.tree).sym == sym && |
rfield@1380 | 1069 | sym.owner.kind == MTH) { //only locals are captured |
rfield@1380 | 1070 | return currentDepth > depth ? null : block.tree; |
rfield@1380 | 1071 | } |
rfield@1380 | 1072 | break; |
rfield@1380 | 1073 | case BLOCK: |
rfield@1380 | 1074 | case METHODDEF: |
rfield@1380 | 1075 | case LAMBDA: |
rfield@1380 | 1076 | if (block.locals != null && block.locals.contains(sym)) { |
rfield@1380 | 1077 | return currentDepth > depth ? null : block.tree; |
rfield@1380 | 1078 | } |
rfield@1380 | 1079 | break; |
rfield@1380 | 1080 | default: |
rfield@1380 | 1081 | Assert.error("bad decl kind " + block.tree.getTag()); |
rfield@1380 | 1082 | } |
rfield@1380 | 1083 | currentDepth--; |
rfield@1380 | 1084 | } |
rfield@1380 | 1085 | return null; |
rfield@1380 | 1086 | } |
rfield@1380 | 1087 | |
rfield@1380 | 1088 | private TranslationContext<?> context() { |
rfield@1380 | 1089 | for (Frame frame : frameStack) { |
rfield@1380 | 1090 | TranslationContext<?> context = contextMap.get(frame.tree); |
rfield@1380 | 1091 | if (context != null) { |
rfield@1380 | 1092 | return context; |
rfield@1380 | 1093 | } |
rfield@1380 | 1094 | } |
rfield@1380 | 1095 | return null; |
rfield@1380 | 1096 | } |
rfield@1380 | 1097 | |
rfield@1380 | 1098 | /** |
rfield@1380 | 1099 | * This is used to filter out those identifiers that needs to be adjusted |
rfield@1380 | 1100 | * when translating away lambda expressions |
rfield@1380 | 1101 | */ |
rfield@1380 | 1102 | private boolean lambdaIdentSymbolFilter(Symbol sym) { |
rfield@1380 | 1103 | return (sym.kind == VAR || sym.kind == MTH) |
rfield@1380 | 1104 | && !sym.isStatic() |
rfield@1380 | 1105 | && sym.name != names.init; |
rfield@1380 | 1106 | } |
rfield@1380 | 1107 | |
rfield@1380 | 1108 | private boolean lambdaSelectSymbolFilter(Symbol sym) { |
rfield@1380 | 1109 | return (sym.kind == VAR || sym.kind == MTH) && |
rfield@1380 | 1110 | !sym.isStatic() && |
rfield@1380 | 1111 | (sym.name == names._this || |
rfield@1380 | 1112 | sym.name == names._super); |
rfield@1380 | 1113 | } |
rfield@1380 | 1114 | |
rfield@1380 | 1115 | /** |
rfield@1380 | 1116 | * This is used to filter out those new class expressions that need to |
rfield@1380 | 1117 | * be qualified with an enclosing tree |
rfield@1380 | 1118 | */ |
rfield@1380 | 1119 | private boolean lambdaNewClassFilter(TranslationContext<?> context, JCNewClass tree) { |
rfield@1380 | 1120 | if (context != null |
rfield@1380 | 1121 | && tree.encl == null |
rfield@1380 | 1122 | && tree.def == null |
rfield@1380 | 1123 | && tree.type.getEnclosingType().hasTag(NONE)) { |
rfield@1380 | 1124 | Type encl = tree.type.getEnclosingType(); |
rfield@1380 | 1125 | Type current = context.owner.enclClass().type; |
rfield@1380 | 1126 | while (current.hasTag(NONE)) { |
rfield@1380 | 1127 | if (current.tsym.isSubClass(encl.tsym, types)) { |
rfield@1380 | 1128 | return true; |
rfield@1380 | 1129 | } |
rfield@1380 | 1130 | current = current.getEnclosingType(); |
rfield@1380 | 1131 | } |
rfield@1380 | 1132 | return false; |
rfield@1380 | 1133 | } else { |
rfield@1380 | 1134 | return false; |
rfield@1380 | 1135 | } |
rfield@1380 | 1136 | } |
rfield@1380 | 1137 | |
rfield@1380 | 1138 | private TranslationContext<JCLambda> makeLambdaContext(JCLambda tree) { |
rfield@1380 | 1139 | return new LambdaTranslationContext(tree); |
rfield@1380 | 1140 | } |
rfield@1380 | 1141 | |
rfield@1380 | 1142 | private TranslationContext<JCMemberReference> makeReferenceContext(JCMemberReference tree) { |
rfield@1380 | 1143 | return new ReferenceTranslationContext(tree); |
rfield@1380 | 1144 | } |
rfield@1380 | 1145 | |
rfield@1380 | 1146 | private class Frame { |
rfield@1380 | 1147 | final JCTree tree; |
rfield@1380 | 1148 | List<Symbol> locals; |
rfield@1380 | 1149 | |
rfield@1380 | 1150 | public Frame(JCTree tree) { |
rfield@1380 | 1151 | this.tree = tree; |
rfield@1380 | 1152 | } |
rfield@1380 | 1153 | |
rfield@1380 | 1154 | void addLocal(Symbol sym) { |
rfield@1380 | 1155 | if (locals == null) { |
rfield@1380 | 1156 | locals = List.nil(); |
rfield@1380 | 1157 | } |
rfield@1380 | 1158 | locals = locals.prepend(sym); |
rfield@1380 | 1159 | } |
rfield@1380 | 1160 | } |
rfield@1380 | 1161 | |
rfield@1380 | 1162 | /** |
rfield@1380 | 1163 | * This class is used to store important information regarding translation of |
rfield@1380 | 1164 | * lambda expression/method references (see subclasses). |
rfield@1380 | 1165 | */ |
rfield@1380 | 1166 | private abstract class TranslationContext<T extends JCTree> { |
rfield@1380 | 1167 | |
rfield@1380 | 1168 | /** the underlying (untranslated) tree */ |
rfield@1380 | 1169 | T tree; |
rfield@1380 | 1170 | |
rfield@1380 | 1171 | /** points to the adjusted enclosing scope in which this lambda/mref expression occurs */ |
rfield@1380 | 1172 | Symbol owner; |
rfield@1380 | 1173 | |
rfield@1380 | 1174 | /** the depth of this lambda expression in the frame stack */ |
rfield@1380 | 1175 | int depth; |
rfield@1380 | 1176 | |
rfield@1380 | 1177 | /** the enclosing translation context (set for nested lambdas/mref) */ |
rfield@1380 | 1178 | TranslationContext<?> prev; |
rfield@1380 | 1179 | |
rfield@1380 | 1180 | TranslationContext(T tree) { |
rfield@1380 | 1181 | this.tree = tree; |
rfield@1380 | 1182 | this.owner = owner(); |
rfield@1380 | 1183 | this.depth = frameStack.size() - 1; |
rfield@1380 | 1184 | this.prev = context(); |
rfield@1380 | 1185 | } |
rfield@1380 | 1186 | } |
rfield@1380 | 1187 | |
rfield@1380 | 1188 | /** |
rfield@1380 | 1189 | * This class retains all the useful information about a lambda expression; |
rfield@1380 | 1190 | * the contents of this class are filled by the LambdaAnalyzer visitor, |
rfield@1380 | 1191 | * and the used by the main translation routines in order to adjust references |
rfield@1380 | 1192 | * to captured locals/members, etc. |
rfield@1380 | 1193 | */ |
rfield@1380 | 1194 | private class LambdaTranslationContext extends TranslationContext<JCLambda> { |
rfield@1380 | 1195 | |
rfield@1380 | 1196 | /** variable in the enclosing context to which this lambda is assigned */ |
rfield@1380 | 1197 | Symbol self; |
rfield@1380 | 1198 | |
rfield@1380 | 1199 | /** map from original to translated lambda parameters */ |
rfield@1380 | 1200 | Map<Symbol, Symbol> lambdaParams = new LinkedHashMap<Symbol, Symbol>(); |
rfield@1380 | 1201 | |
rfield@1380 | 1202 | /** map from original to translated lambda locals */ |
rfield@1380 | 1203 | Map<Symbol, Symbol> lambdaLocals = new LinkedHashMap<Symbol, Symbol>(); |
rfield@1380 | 1204 | |
rfield@1380 | 1205 | /** map from variables in enclosing scope to translated synthetic parameters */ |
rfield@1380 | 1206 | Map<Symbol, Symbol> capturedLocals = new LinkedHashMap<Symbol, Symbol>(); |
rfield@1380 | 1207 | |
rfield@1380 | 1208 | /** map from class symbols to translated synthetic parameters (for captured member access) */ |
rfield@1380 | 1209 | Map<Symbol, Symbol> capturedThis = new LinkedHashMap<Symbol, Symbol>(); |
rfield@1380 | 1210 | |
rfield@1380 | 1211 | /** the synthetic symbol for the method hoisting the translated lambda */ |
rfield@1380 | 1212 | Symbol translatedSym; |
rfield@1380 | 1213 | |
rfield@1380 | 1214 | List<JCVariableDecl> syntheticParams; |
rfield@1380 | 1215 | |
rfield@1380 | 1216 | LambdaTranslationContext(JCLambda tree) { |
rfield@1380 | 1217 | super(tree); |
rfield@1380 | 1218 | Frame frame = frameStack.head; |
rfield@1380 | 1219 | if (frame.tree.hasTag(VARDEF)) { |
rfield@1380 | 1220 | self = ((JCVariableDecl)frame.tree).sym; |
rfield@1380 | 1221 | } |
rfield@1380 | 1222 | this.translatedSym = makeSyntheticMethod(0, lambdaName(), null, owner.enclClass()); |
rfield@1380 | 1223 | } |
rfield@1380 | 1224 | |
rfield@1380 | 1225 | /** |
rfield@1380 | 1226 | * Translate a symbol of a given kind into something suitable for the |
rfield@1380 | 1227 | * synthetic lambda body |
rfield@1380 | 1228 | */ |
rfield@1380 | 1229 | Symbol translate(String name, Symbol sym, LambdaSymbolKind skind) { |
rfield@1380 | 1230 | if (skind == CAPTURED_THIS) { |
rfield@1380 | 1231 | return sym; // self represented |
rfield@1380 | 1232 | } else { |
rfield@1380 | 1233 | return makeSyntheticVar(FINAL, name, types.erasure(sym.type), translatedSym); |
rfield@1380 | 1234 | } |
rfield@1380 | 1235 | } |
rfield@1380 | 1236 | |
rfield@1380 | 1237 | void addSymbol(Symbol sym, LambdaSymbolKind skind) { |
rfield@1380 | 1238 | Map<Symbol, Symbol> transMap = null; |
rfield@1380 | 1239 | String preferredName; |
rfield@1380 | 1240 | switch (skind) { |
rfield@1380 | 1241 | case CAPTURED_THIS: |
rfield@1380 | 1242 | transMap = capturedThis; |
rfield@1380 | 1243 | preferredName = "encl$" + capturedThis.size(); |
rfield@1380 | 1244 | break; |
rfield@1380 | 1245 | case CAPTURED_VAR: |
rfield@1380 | 1246 | transMap = capturedLocals; |
rfield@1380 | 1247 | preferredName = "cap$" + capturedLocals.size(); |
rfield@1380 | 1248 | break; |
rfield@1380 | 1249 | case LOCAL_VAR: |
rfield@1380 | 1250 | transMap = lambdaLocals; |
rfield@1380 | 1251 | preferredName = sym.name.toString(); |
rfield@1380 | 1252 | break; |
rfield@1380 | 1253 | case PARAM: |
rfield@1380 | 1254 | transMap = lambdaParams; |
rfield@1380 | 1255 | preferredName = sym.name.toString(); |
rfield@1380 | 1256 | break; |
rfield@1380 | 1257 | default: throw new AssertionError(); |
rfield@1380 | 1258 | } |
rfield@1380 | 1259 | if (!transMap.containsKey(sym)) { |
rfield@1380 | 1260 | transMap.put(sym, translate(preferredName, sym, skind)); |
rfield@1380 | 1261 | } |
rfield@1380 | 1262 | } |
rfield@1380 | 1263 | |
rfield@1380 | 1264 | Map<Symbol, Symbol> getSymbolMap(LambdaSymbolKind... skinds) { |
rfield@1380 | 1265 | LinkedHashMap<Symbol, Symbol> translationMap = new LinkedHashMap<Symbol, Symbol>(); |
rfield@1380 | 1266 | for (LambdaSymbolKind skind : skinds) { |
rfield@1380 | 1267 | switch (skind) { |
rfield@1380 | 1268 | case CAPTURED_THIS: |
rfield@1380 | 1269 | translationMap.putAll(capturedThis); |
rfield@1380 | 1270 | break; |
rfield@1380 | 1271 | case CAPTURED_VAR: |
rfield@1380 | 1272 | translationMap.putAll(capturedLocals); |
rfield@1380 | 1273 | break; |
rfield@1380 | 1274 | case LOCAL_VAR: |
rfield@1380 | 1275 | translationMap.putAll(lambdaLocals); |
rfield@1380 | 1276 | break; |
rfield@1380 | 1277 | case PARAM: |
rfield@1380 | 1278 | translationMap.putAll(lambdaParams); |
rfield@1380 | 1279 | break; |
rfield@1380 | 1280 | default: throw new AssertionError(); |
rfield@1380 | 1281 | } |
rfield@1380 | 1282 | } |
rfield@1380 | 1283 | return translationMap; |
rfield@1380 | 1284 | } |
rfield@1380 | 1285 | |
rfield@1380 | 1286 | /** |
rfield@1380 | 1287 | * The translatedSym is not complete/accurate until the analysis is |
rfield@1380 | 1288 | * finished. Once the analysis is finished, the translatedSym is |
rfield@1380 | 1289 | * "completed" -- updated with type information, access modifiers, |
rfield@1380 | 1290 | * and full parameter list. |
rfield@1380 | 1291 | */ |
rfield@1380 | 1292 | void complete() { |
rfield@1380 | 1293 | if (syntheticParams != null) { |
rfield@1380 | 1294 | return; |
rfield@1380 | 1295 | } |
rfield@1380 | 1296 | boolean inInterface = translatedSym.owner.isInterface(); |
rfield@1380 | 1297 | boolean thisReferenced = !getSymbolMap(CAPTURED_THIS).isEmpty(); |
rfield@1380 | 1298 | boolean needInstance = thisReferenced || inInterface; |
rfield@1380 | 1299 | |
rfield@1380 | 1300 | // If instance access isn't needed, make it static |
rfield@1380 | 1301 | // Interface methods much be public default methods, otherwise make it private |
rfield@1380 | 1302 | translatedSym.flags_field = SYNTHETIC | (needInstance? 0 : STATIC) | (inInterface? PUBLIC | DEFAULT : PRIVATE); |
rfield@1380 | 1303 | |
rfield@1380 | 1304 | //compute synthetic params |
rfield@1380 | 1305 | ListBuffer<JCVariableDecl> params = ListBuffer.lb(); |
rfield@1380 | 1306 | |
rfield@1380 | 1307 | // The signature of the method is augmented with the following |
rfield@1380 | 1308 | // synthetic parameters: |
rfield@1380 | 1309 | // |
rfield@1380 | 1310 | // 1) reference to enclosing contexts captured by the lambda expression |
rfield@1380 | 1311 | // 2) enclosing locals captured by the lambda expression |
rfield@1380 | 1312 | for (Symbol thisSym : getSymbolMap(CAPTURED_VAR, PARAM).values()) { |
rfield@1380 | 1313 | params.append(make.VarDef((VarSymbol) thisSym, null)); |
rfield@1380 | 1314 | } |
rfield@1380 | 1315 | |
rfield@1380 | 1316 | syntheticParams = params.toList(); |
rfield@1380 | 1317 | |
rfield@1380 | 1318 | //prepend synthetic args to translated lambda method signature |
rfield@1380 | 1319 | translatedSym.type = (MethodType) types.createMethodTypeWithParameters( |
rfield@1380 | 1320 | (MethodType) generatedLambdaSig(), |
rfield@1380 | 1321 | TreeInfo.types(syntheticParams)); |
rfield@1380 | 1322 | } |
rfield@1380 | 1323 | |
rfield@1380 | 1324 | Type enclosingType() { |
rfield@1380 | 1325 | //local inner classes defined inside a lambda are always non-static |
rfield@1380 | 1326 | return owner.enclClass().type; |
rfield@1380 | 1327 | } |
rfield@1380 | 1328 | |
rfield@1380 | 1329 | Type generatedLambdaSig() { |
rfield@1380 | 1330 | return types.erasure(types.findDescriptorType(tree.targetType)); |
rfield@1380 | 1331 | } |
rfield@1380 | 1332 | } |
rfield@1380 | 1333 | |
rfield@1380 | 1334 | /** |
rfield@1380 | 1335 | * This class retains all the useful information about a method reference; |
rfield@1380 | 1336 | * the contents of this class are filled by the LambdaAnalyzer visitor, |
rfield@1380 | 1337 | * and the used by the main translation routines in order to adjust method |
rfield@1380 | 1338 | * references (i.e. in case a bridge is needed) |
rfield@1380 | 1339 | */ |
rfield@1380 | 1340 | private class ReferenceTranslationContext extends TranslationContext<JCMemberReference> { |
rfield@1380 | 1341 | |
rfield@1380 | 1342 | final boolean isSuper; |
rfield@1380 | 1343 | final Symbol bridgeSym; |
rfield@1380 | 1344 | |
rfield@1380 | 1345 | ReferenceTranslationContext(JCMemberReference tree) { |
rfield@1380 | 1346 | super(tree); |
rfield@1380 | 1347 | this.isSuper = tree.hasKind(ReferenceKind.SUPER); |
rfield@1380 | 1348 | this.bridgeSym = needsBridge() |
rfield@1380 | 1349 | ? makeSyntheticMethod(isSuper ? 0 : STATIC, |
rfield@1380 | 1350 | lambdaName().append(names.fromString("$bridge")), null, |
rfield@1380 | 1351 | owner.enclClass()) |
rfield@1380 | 1352 | : null; |
rfield@1380 | 1353 | } |
rfield@1380 | 1354 | |
rfield@1380 | 1355 | /** |
rfield@1380 | 1356 | * Get the opcode associated with this method reference |
rfield@1380 | 1357 | */ |
rfield@1380 | 1358 | int referenceKind() { |
rfield@1380 | 1359 | return LambdaToMethod.this.referenceKind(needsBridge() ? bridgeSym : tree.sym); |
rfield@1380 | 1360 | } |
rfield@1380 | 1361 | |
rfield@1380 | 1362 | boolean needsVarArgsConversion() { |
rfield@1380 | 1363 | return tree.varargsElement != null; |
rfield@1380 | 1364 | } |
rfield@1380 | 1365 | |
rfield@1380 | 1366 | /** |
rfield@1380 | 1367 | * @return Is this an array operation like clone() |
rfield@1380 | 1368 | */ |
rfield@1380 | 1369 | boolean isArrayOp() { |
rfield@1380 | 1370 | return tree.sym.owner == syms.arrayClass; |
rfield@1380 | 1371 | } |
rfield@1380 | 1372 | |
rfield@1380 | 1373 | /** |
rfield@1380 | 1374 | * Does this reference needs a bridge (i.e. var args need to be |
rfield@1380 | 1375 | * expanded or "super" is used) |
rfield@1380 | 1376 | */ |
rfield@1380 | 1377 | final boolean needsBridge() { |
rfield@1380 | 1378 | return isSuper || needsVarArgsConversion() || isArrayOp(); |
rfield@1380 | 1379 | } |
rfield@1380 | 1380 | |
rfield@1380 | 1381 | Type generatedRefSig() { |
rfield@1380 | 1382 | return types.erasure(tree.sym.type); |
rfield@1380 | 1383 | } |
rfield@1380 | 1384 | |
rfield@1380 | 1385 | Type bridgedRefSig() { |
rfield@1380 | 1386 | return types.erasure(types.findDescriptorSymbol(tree.targetType.tsym).type); |
rfield@1380 | 1387 | } |
rfield@1380 | 1388 | } |
rfield@1380 | 1389 | } |
rfield@1380 | 1390 | // </editor-fold> |
rfield@1380 | 1391 | |
rfield@1380 | 1392 | enum LambdaSymbolKind { |
rfield@1380 | 1393 | CAPTURED_VAR, |
rfield@1380 | 1394 | CAPTURED_THIS, |
rfield@1380 | 1395 | LOCAL_VAR, |
rfield@1380 | 1396 | PARAM; |
rfield@1380 | 1397 | } |
rfield@1380 | 1398 | } |