Thu, 29 Jul 2010 15:57:43 +0100
6970833: Try-with-resource implementation throws an NPE during Flow analysis
Summary: Updated logic not to rely upon Symbol.implementation (which check in superinterfaces)
Reviewed-by: jjg
duke@1 | 1 | /* |
ohair@554 | 2 | * Copyright (c) 1999, 2009, Oracle and/or its affiliates. All rights reserved. |
duke@1 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@1 | 4 | * |
duke@1 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@1 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ohair@554 | 7 | * published by the Free Software Foundation. Oracle designates this |
duke@1 | 8 | * particular file as subject to the "Classpath" exception as provided |
ohair@554 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
duke@1 | 10 | * |
duke@1 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@1 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@1 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@1 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@1 | 15 | * accompanied this code). |
duke@1 | 16 | * |
duke@1 | 17 | * You should have received a copy of the GNU General Public License version |
duke@1 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@1 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@1 | 20 | * |
ohair@554 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
ohair@554 | 22 | * or visit www.oracle.com if you need additional information or have any |
ohair@554 | 23 | * questions. |
duke@1 | 24 | */ |
duke@1 | 25 | |
duke@1 | 26 | package com.sun.tools.javac.comp; |
duke@1 | 27 | |
duke@1 | 28 | import java.util.*; |
duke@1 | 29 | import java.util.Set; |
duke@1 | 30 | import javax.lang.model.element.ElementKind; |
duke@1 | 31 | import javax.tools.JavaFileObject; |
duke@1 | 32 | |
duke@1 | 33 | import com.sun.tools.javac.code.*; |
duke@1 | 34 | import com.sun.tools.javac.jvm.*; |
duke@1 | 35 | import com.sun.tools.javac.tree.*; |
duke@1 | 36 | import com.sun.tools.javac.util.*; |
duke@1 | 37 | import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; |
duke@1 | 38 | import com.sun.tools.javac.util.List; |
duke@1 | 39 | |
duke@1 | 40 | import com.sun.tools.javac.jvm.Target; |
duke@1 | 41 | import com.sun.tools.javac.code.Symbol.*; |
duke@1 | 42 | import com.sun.tools.javac.tree.JCTree.*; |
duke@1 | 43 | import com.sun.tools.javac.code.Type.*; |
duke@1 | 44 | |
duke@1 | 45 | import com.sun.source.tree.IdentifierTree; |
duke@1 | 46 | import com.sun.source.tree.MemberSelectTree; |
duke@1 | 47 | import com.sun.source.tree.TreeVisitor; |
duke@1 | 48 | import com.sun.source.util.SimpleTreeVisitor; |
duke@1 | 49 | |
duke@1 | 50 | import static com.sun.tools.javac.code.Flags.*; |
duke@1 | 51 | import static com.sun.tools.javac.code.Kinds.*; |
duke@1 | 52 | import static com.sun.tools.javac.code.TypeTags.*; |
duke@1 | 53 | |
duke@1 | 54 | /** This is the main context-dependent analysis phase in GJC. It |
duke@1 | 55 | * encompasses name resolution, type checking and constant folding as |
duke@1 | 56 | * subtasks. Some subtasks involve auxiliary classes. |
duke@1 | 57 | * @see Check |
duke@1 | 58 | * @see Resolve |
duke@1 | 59 | * @see ConstFold |
duke@1 | 60 | * @see Infer |
duke@1 | 61 | * |
jjg@581 | 62 | * <p><b>This is NOT part of any supported API. |
jjg@581 | 63 | * If you write code that depends on this, you do so at your own risk. |
duke@1 | 64 | * This code and its internal interfaces are subject to change or |
duke@1 | 65 | * deletion without notice.</b> |
duke@1 | 66 | */ |
duke@1 | 67 | public class Attr extends JCTree.Visitor { |
duke@1 | 68 | protected static final Context.Key<Attr> attrKey = |
duke@1 | 69 | new Context.Key<Attr>(); |
duke@1 | 70 | |
jjg@113 | 71 | final Names names; |
duke@1 | 72 | final Log log; |
duke@1 | 73 | final Symtab syms; |
duke@1 | 74 | final Resolve rs; |
mcimadamore@537 | 75 | final Infer infer; |
duke@1 | 76 | final Check chk; |
duke@1 | 77 | final MemberEnter memberEnter; |
duke@1 | 78 | final TreeMaker make; |
duke@1 | 79 | final ConstFold cfolder; |
duke@1 | 80 | final Enter enter; |
duke@1 | 81 | final Target target; |
duke@1 | 82 | final Types types; |
mcimadamore@89 | 83 | final JCDiagnostic.Factory diags; |
duke@1 | 84 | final Annotate annotate; |
duke@1 | 85 | |
duke@1 | 86 | public static Attr instance(Context context) { |
duke@1 | 87 | Attr instance = context.get(attrKey); |
duke@1 | 88 | if (instance == null) |
duke@1 | 89 | instance = new Attr(context); |
duke@1 | 90 | return instance; |
duke@1 | 91 | } |
duke@1 | 92 | |
duke@1 | 93 | protected Attr(Context context) { |
duke@1 | 94 | context.put(attrKey, this); |
duke@1 | 95 | |
jjg@113 | 96 | names = Names.instance(context); |
duke@1 | 97 | log = Log.instance(context); |
duke@1 | 98 | syms = Symtab.instance(context); |
duke@1 | 99 | rs = Resolve.instance(context); |
duke@1 | 100 | chk = Check.instance(context); |
duke@1 | 101 | memberEnter = MemberEnter.instance(context); |
duke@1 | 102 | make = TreeMaker.instance(context); |
duke@1 | 103 | enter = Enter.instance(context); |
mcimadamore@537 | 104 | infer = Infer.instance(context); |
duke@1 | 105 | cfolder = ConstFold.instance(context); |
duke@1 | 106 | target = Target.instance(context); |
duke@1 | 107 | types = Types.instance(context); |
mcimadamore@89 | 108 | diags = JCDiagnostic.Factory.instance(context); |
duke@1 | 109 | annotate = Annotate.instance(context); |
duke@1 | 110 | |
duke@1 | 111 | Options options = Options.instance(context); |
duke@1 | 112 | |
duke@1 | 113 | Source source = Source.instance(context); |
duke@1 | 114 | allowGenerics = source.allowGenerics(); |
duke@1 | 115 | allowVarargs = source.allowVarargs(); |
duke@1 | 116 | allowEnums = source.allowEnums(); |
duke@1 | 117 | allowBoxing = source.allowBoxing(); |
duke@1 | 118 | allowCovariantReturns = source.allowCovariantReturns(); |
duke@1 | 119 | allowAnonOuterThis = source.allowAnonOuterThis(); |
darcy@430 | 120 | allowStringsInSwitch = source.allowStringsInSwitch(); |
darcy@430 | 121 | sourceName = source.name; |
duke@1 | 122 | relax = (options.get("-retrofit") != null || |
duke@1 | 123 | options.get("-relax") != null); |
duke@1 | 124 | useBeforeDeclarationWarning = options.get("useBeforeDeclarationWarning") != null; |
jjg@377 | 125 | enableSunApiLintControl = options.get("enableSunApiLintControl") != null; |
duke@1 | 126 | } |
duke@1 | 127 | |
duke@1 | 128 | /** Switch: relax some constraints for retrofit mode. |
duke@1 | 129 | */ |
duke@1 | 130 | boolean relax; |
duke@1 | 131 | |
duke@1 | 132 | /** Switch: support generics? |
duke@1 | 133 | */ |
duke@1 | 134 | boolean allowGenerics; |
duke@1 | 135 | |
duke@1 | 136 | /** Switch: allow variable-arity methods. |
duke@1 | 137 | */ |
duke@1 | 138 | boolean allowVarargs; |
duke@1 | 139 | |
duke@1 | 140 | /** Switch: support enums? |
duke@1 | 141 | */ |
duke@1 | 142 | boolean allowEnums; |
duke@1 | 143 | |
duke@1 | 144 | /** Switch: support boxing and unboxing? |
duke@1 | 145 | */ |
duke@1 | 146 | boolean allowBoxing; |
duke@1 | 147 | |
duke@1 | 148 | /** Switch: support covariant result types? |
duke@1 | 149 | */ |
duke@1 | 150 | boolean allowCovariantReturns; |
duke@1 | 151 | |
duke@1 | 152 | /** Switch: allow references to surrounding object from anonymous |
duke@1 | 153 | * objects during constructor call? |
duke@1 | 154 | */ |
duke@1 | 155 | boolean allowAnonOuterThis; |
duke@1 | 156 | |
duke@1 | 157 | /** |
duke@1 | 158 | * Switch: warn about use of variable before declaration? |
duke@1 | 159 | * RFE: 6425594 |
duke@1 | 160 | */ |
duke@1 | 161 | boolean useBeforeDeclarationWarning; |
duke@1 | 162 | |
jjg@377 | 163 | /** |
jjg@582 | 164 | * Switch: allow lint infrastructure to control proprietary |
jjg@377 | 165 | * API warnings. |
jjg@377 | 166 | */ |
jjg@377 | 167 | boolean enableSunApiLintControl; |
jjg@377 | 168 | |
darcy@430 | 169 | /** |
darcy@430 | 170 | * Switch: allow strings in switch? |
darcy@430 | 171 | */ |
darcy@430 | 172 | boolean allowStringsInSwitch; |
darcy@430 | 173 | |
darcy@430 | 174 | /** |
darcy@430 | 175 | * Switch: name of source level; used for error reporting. |
darcy@430 | 176 | */ |
darcy@430 | 177 | String sourceName; |
darcy@430 | 178 | |
duke@1 | 179 | /** Check kind and type of given tree against protokind and prototype. |
duke@1 | 180 | * If check succeeds, store type in tree and return it. |
duke@1 | 181 | * If check fails, store errType in tree and return it. |
duke@1 | 182 | * No checks are performed if the prototype is a method type. |
jjg@110 | 183 | * It is not necessary in this case since we know that kind and type |
duke@1 | 184 | * are correct. |
duke@1 | 185 | * |
duke@1 | 186 | * @param tree The tree whose kind and type is checked |
duke@1 | 187 | * @param owntype The computed type of the tree |
duke@1 | 188 | * @param ownkind The computed kind of the tree |
duke@1 | 189 | * @param pkind The expected kind (or: protokind) of the tree |
duke@1 | 190 | * @param pt The expected type (or: prototype) of the tree |
duke@1 | 191 | */ |
duke@1 | 192 | Type check(JCTree tree, Type owntype, int ownkind, int pkind, Type pt) { |
duke@1 | 193 | if (owntype.tag != ERROR && pt.tag != METHOD && pt.tag != FORALL) { |
duke@1 | 194 | if ((ownkind & ~pkind) == 0) { |
darcy@609 | 195 | owntype = chk.checkType(tree.pos(), owntype, pt, errKey); |
duke@1 | 196 | } else { |
duke@1 | 197 | log.error(tree.pos(), "unexpected.type", |
mcimadamore@80 | 198 | kindNames(pkind), |
mcimadamore@80 | 199 | kindName(ownkind)); |
jjg@110 | 200 | owntype = types.createErrorType(owntype); |
duke@1 | 201 | } |
duke@1 | 202 | } |
duke@1 | 203 | tree.type = owntype; |
duke@1 | 204 | return owntype; |
duke@1 | 205 | } |
duke@1 | 206 | |
duke@1 | 207 | /** Is given blank final variable assignable, i.e. in a scope where it |
duke@1 | 208 | * may be assigned to even though it is final? |
duke@1 | 209 | * @param v The blank final variable. |
duke@1 | 210 | * @param env The current environment. |
duke@1 | 211 | */ |
duke@1 | 212 | boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { |
duke@1 | 213 | Symbol owner = env.info.scope.owner; |
duke@1 | 214 | // owner refers to the innermost variable, method or |
duke@1 | 215 | // initializer block declaration at this point. |
duke@1 | 216 | return |
duke@1 | 217 | v.owner == owner |
duke@1 | 218 | || |
duke@1 | 219 | ((owner.name == names.init || // i.e. we are in a constructor |
duke@1 | 220 | owner.kind == VAR || // i.e. we are in a variable initializer |
duke@1 | 221 | (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block |
duke@1 | 222 | && |
duke@1 | 223 | v.owner == owner.owner |
duke@1 | 224 | && |
duke@1 | 225 | ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); |
duke@1 | 226 | } |
duke@1 | 227 | |
duke@1 | 228 | /** Check that variable can be assigned to. |
duke@1 | 229 | * @param pos The current source code position. |
duke@1 | 230 | * @param v The assigned varaible |
duke@1 | 231 | * @param base If the variable is referred to in a Select, the part |
duke@1 | 232 | * to the left of the `.', null otherwise. |
duke@1 | 233 | * @param env The current environment. |
duke@1 | 234 | */ |
duke@1 | 235 | void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { |
duke@1 | 236 | if ((v.flags() & FINAL) != 0 && |
duke@1 | 237 | ((v.flags() & HASINIT) != 0 |
duke@1 | 238 | || |
duke@1 | 239 | !((base == null || |
duke@1 | 240 | (base.getTag() == JCTree.IDENT && TreeInfo.name(base) == names._this)) && |
duke@1 | 241 | isAssignableAsBlankFinal(v, env)))) { |
darcy@609 | 242 | if (v.isResourceVariable()) { //TWR resource |
darcy@609 | 243 | log.error(pos, "twr.resource.may.not.be.assigned", v); |
darcy@609 | 244 | } else { |
darcy@609 | 245 | log.error(pos, "cant.assign.val.to.final.var", v); |
darcy@609 | 246 | } |
duke@1 | 247 | } |
duke@1 | 248 | } |
duke@1 | 249 | |
duke@1 | 250 | /** Does tree represent a static reference to an identifier? |
duke@1 | 251 | * It is assumed that tree is either a SELECT or an IDENT. |
duke@1 | 252 | * We have to weed out selects from non-type names here. |
duke@1 | 253 | * @param tree The candidate tree. |
duke@1 | 254 | */ |
duke@1 | 255 | boolean isStaticReference(JCTree tree) { |
duke@1 | 256 | if (tree.getTag() == JCTree.SELECT) { |
duke@1 | 257 | Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); |
duke@1 | 258 | if (lsym == null || lsym.kind != TYP) { |
duke@1 | 259 | return false; |
duke@1 | 260 | } |
duke@1 | 261 | } |
duke@1 | 262 | return true; |
duke@1 | 263 | } |
duke@1 | 264 | |
duke@1 | 265 | /** Is this symbol a type? |
duke@1 | 266 | */ |
duke@1 | 267 | static boolean isType(Symbol sym) { |
duke@1 | 268 | return sym != null && sym.kind == TYP; |
duke@1 | 269 | } |
duke@1 | 270 | |
duke@1 | 271 | /** The current `this' symbol. |
duke@1 | 272 | * @param env The current environment. |
duke@1 | 273 | */ |
duke@1 | 274 | Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { |
duke@1 | 275 | return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); |
duke@1 | 276 | } |
duke@1 | 277 | |
duke@1 | 278 | /** Attribute a parsed identifier. |
duke@1 | 279 | * @param tree Parsed identifier name |
duke@1 | 280 | * @param topLevel The toplevel to use |
duke@1 | 281 | */ |
duke@1 | 282 | public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { |
duke@1 | 283 | Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); |
duke@1 | 284 | localEnv.enclClass = make.ClassDef(make.Modifiers(0), |
duke@1 | 285 | syms.errSymbol.name, |
duke@1 | 286 | null, null, null, null); |
duke@1 | 287 | localEnv.enclClass.sym = syms.errSymbol; |
duke@1 | 288 | return tree.accept(identAttributer, localEnv); |
duke@1 | 289 | } |
duke@1 | 290 | // where |
duke@1 | 291 | private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); |
duke@1 | 292 | private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { |
duke@1 | 293 | @Override |
duke@1 | 294 | public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { |
duke@1 | 295 | Symbol site = visit(node.getExpression(), env); |
duke@1 | 296 | if (site.kind == ERR) |
duke@1 | 297 | return site; |
duke@1 | 298 | Name name = (Name)node.getIdentifier(); |
duke@1 | 299 | if (site.kind == PCK) { |
duke@1 | 300 | env.toplevel.packge = (PackageSymbol)site; |
duke@1 | 301 | return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK); |
duke@1 | 302 | } else { |
duke@1 | 303 | env.enclClass.sym = (ClassSymbol)site; |
duke@1 | 304 | return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); |
duke@1 | 305 | } |
duke@1 | 306 | } |
duke@1 | 307 | |
duke@1 | 308 | @Override |
duke@1 | 309 | public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { |
duke@1 | 310 | return rs.findIdent(env, (Name)node.getName(), TYP | PCK); |
duke@1 | 311 | } |
duke@1 | 312 | } |
duke@1 | 313 | |
duke@1 | 314 | public Type coerce(Type etype, Type ttype) { |
duke@1 | 315 | return cfolder.coerce(etype, ttype); |
duke@1 | 316 | } |
duke@1 | 317 | |
duke@1 | 318 | public Type attribType(JCTree node, TypeSymbol sym) { |
duke@1 | 319 | Env<AttrContext> env = enter.typeEnvs.get(sym); |
duke@1 | 320 | Env<AttrContext> localEnv = env.dup(node, env.info.dup()); |
duke@1 | 321 | return attribTree(node, localEnv, Kinds.TYP, Type.noType); |
duke@1 | 322 | } |
duke@1 | 323 | |
duke@1 | 324 | public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { |
duke@1 | 325 | breakTree = tree; |
mcimadamore@303 | 326 | JavaFileObject prev = log.useSource(env.toplevel.sourcefile); |
duke@1 | 327 | try { |
duke@1 | 328 | attribExpr(expr, env); |
duke@1 | 329 | } catch (BreakAttr b) { |
duke@1 | 330 | return b.env; |
duke@1 | 331 | } finally { |
duke@1 | 332 | breakTree = null; |
duke@1 | 333 | log.useSource(prev); |
duke@1 | 334 | } |
duke@1 | 335 | return env; |
duke@1 | 336 | } |
duke@1 | 337 | |
duke@1 | 338 | public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { |
duke@1 | 339 | breakTree = tree; |
mcimadamore@303 | 340 | JavaFileObject prev = log.useSource(env.toplevel.sourcefile); |
duke@1 | 341 | try { |
duke@1 | 342 | attribStat(stmt, env); |
duke@1 | 343 | } catch (BreakAttr b) { |
duke@1 | 344 | return b.env; |
duke@1 | 345 | } finally { |
duke@1 | 346 | breakTree = null; |
duke@1 | 347 | log.useSource(prev); |
duke@1 | 348 | } |
duke@1 | 349 | return env; |
duke@1 | 350 | } |
duke@1 | 351 | |
duke@1 | 352 | private JCTree breakTree = null; |
duke@1 | 353 | |
duke@1 | 354 | private static class BreakAttr extends RuntimeException { |
duke@1 | 355 | static final long serialVersionUID = -6924771130405446405L; |
duke@1 | 356 | private Env<AttrContext> env; |
duke@1 | 357 | private BreakAttr(Env<AttrContext> env) { |
duke@1 | 358 | this.env = env; |
duke@1 | 359 | } |
duke@1 | 360 | } |
duke@1 | 361 | |
duke@1 | 362 | |
duke@1 | 363 | /* ************************************************************************ |
duke@1 | 364 | * Visitor methods |
duke@1 | 365 | *************************************************************************/ |
duke@1 | 366 | |
duke@1 | 367 | /** Visitor argument: the current environment. |
duke@1 | 368 | */ |
duke@1 | 369 | Env<AttrContext> env; |
duke@1 | 370 | |
duke@1 | 371 | /** Visitor argument: the currently expected proto-kind. |
duke@1 | 372 | */ |
duke@1 | 373 | int pkind; |
duke@1 | 374 | |
duke@1 | 375 | /** Visitor argument: the currently expected proto-type. |
duke@1 | 376 | */ |
duke@1 | 377 | Type pt; |
duke@1 | 378 | |
darcy@609 | 379 | /** Visitor argument: the error key to be generated when a type error occurs |
darcy@609 | 380 | */ |
darcy@609 | 381 | String errKey; |
darcy@609 | 382 | |
duke@1 | 383 | /** Visitor result: the computed type. |
duke@1 | 384 | */ |
duke@1 | 385 | Type result; |
duke@1 | 386 | |
duke@1 | 387 | /** Visitor method: attribute a tree, catching any completion failure |
duke@1 | 388 | * exceptions. Return the tree's type. |
duke@1 | 389 | * |
duke@1 | 390 | * @param tree The tree to be visited. |
duke@1 | 391 | * @param env The environment visitor argument. |
duke@1 | 392 | * @param pkind The protokind visitor argument. |
duke@1 | 393 | * @param pt The prototype visitor argument. |
duke@1 | 394 | */ |
duke@1 | 395 | Type attribTree(JCTree tree, Env<AttrContext> env, int pkind, Type pt) { |
darcy@609 | 396 | return attribTree(tree, env, pkind, pt, "incompatible.types"); |
darcy@609 | 397 | } |
darcy@609 | 398 | |
darcy@609 | 399 | Type attribTree(JCTree tree, Env<AttrContext> env, int pkind, Type pt, String errKey) { |
duke@1 | 400 | Env<AttrContext> prevEnv = this.env; |
duke@1 | 401 | int prevPkind = this.pkind; |
duke@1 | 402 | Type prevPt = this.pt; |
darcy@609 | 403 | String prevErrKey = this.errKey; |
duke@1 | 404 | try { |
duke@1 | 405 | this.env = env; |
duke@1 | 406 | this.pkind = pkind; |
duke@1 | 407 | this.pt = pt; |
darcy@609 | 408 | this.errKey = errKey; |
duke@1 | 409 | tree.accept(this); |
duke@1 | 410 | if (tree == breakTree) |
duke@1 | 411 | throw new BreakAttr(env); |
duke@1 | 412 | return result; |
duke@1 | 413 | } catch (CompletionFailure ex) { |
duke@1 | 414 | tree.type = syms.errType; |
duke@1 | 415 | return chk.completionError(tree.pos(), ex); |
duke@1 | 416 | } finally { |
duke@1 | 417 | this.env = prevEnv; |
duke@1 | 418 | this.pkind = prevPkind; |
duke@1 | 419 | this.pt = prevPt; |
darcy@609 | 420 | this.errKey = prevErrKey; |
duke@1 | 421 | } |
duke@1 | 422 | } |
duke@1 | 423 | |
duke@1 | 424 | /** Derived visitor method: attribute an expression tree. |
duke@1 | 425 | */ |
duke@1 | 426 | public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { |
duke@1 | 427 | return attribTree(tree, env, VAL, pt.tag != ERROR ? pt : Type.noType); |
duke@1 | 428 | } |
duke@1 | 429 | |
darcy@609 | 430 | public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt, String key) { |
darcy@609 | 431 | return attribTree(tree, env, VAL, pt.tag != ERROR ? pt : Type.noType, key); |
darcy@609 | 432 | } |
darcy@609 | 433 | |
duke@1 | 434 | /** Derived visitor method: attribute an expression tree with |
duke@1 | 435 | * no constraints on the computed type. |
duke@1 | 436 | */ |
duke@1 | 437 | Type attribExpr(JCTree tree, Env<AttrContext> env) { |
duke@1 | 438 | return attribTree(tree, env, VAL, Type.noType); |
duke@1 | 439 | } |
duke@1 | 440 | |
duke@1 | 441 | /** Derived visitor method: attribute a type tree. |
duke@1 | 442 | */ |
duke@1 | 443 | Type attribType(JCTree tree, Env<AttrContext> env) { |
mcimadamore@537 | 444 | Type result = attribType(tree, env, Type.noType); |
mcimadamore@537 | 445 | return result; |
mcimadamore@537 | 446 | } |
mcimadamore@537 | 447 | |
mcimadamore@537 | 448 | /** Derived visitor method: attribute a type tree. |
mcimadamore@537 | 449 | */ |
mcimadamore@537 | 450 | Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { |
mcimadamore@537 | 451 | Type result = attribTree(tree, env, TYP, pt); |
duke@1 | 452 | return result; |
duke@1 | 453 | } |
duke@1 | 454 | |
duke@1 | 455 | /** Derived visitor method: attribute a statement or definition tree. |
duke@1 | 456 | */ |
duke@1 | 457 | public Type attribStat(JCTree tree, Env<AttrContext> env) { |
duke@1 | 458 | return attribTree(tree, env, NIL, Type.noType); |
duke@1 | 459 | } |
duke@1 | 460 | |
duke@1 | 461 | /** Attribute a list of expressions, returning a list of types. |
duke@1 | 462 | */ |
duke@1 | 463 | List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { |
duke@1 | 464 | ListBuffer<Type> ts = new ListBuffer<Type>(); |
duke@1 | 465 | for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) |
duke@1 | 466 | ts.append(attribExpr(l.head, env, pt)); |
duke@1 | 467 | return ts.toList(); |
duke@1 | 468 | } |
duke@1 | 469 | |
duke@1 | 470 | /** Attribute a list of statements, returning nothing. |
duke@1 | 471 | */ |
duke@1 | 472 | <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { |
duke@1 | 473 | for (List<T> l = trees; l.nonEmpty(); l = l.tail) |
duke@1 | 474 | attribStat(l.head, env); |
duke@1 | 475 | } |
duke@1 | 476 | |
duke@1 | 477 | /** Attribute the arguments in a method call, returning a list of types. |
duke@1 | 478 | */ |
duke@1 | 479 | List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) { |
duke@1 | 480 | ListBuffer<Type> argtypes = new ListBuffer<Type>(); |
duke@1 | 481 | for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) |
duke@1 | 482 | argtypes.append(chk.checkNonVoid( |
duke@1 | 483 | l.head.pos(), types.upperBound(attribTree(l.head, env, VAL, Infer.anyPoly)))); |
duke@1 | 484 | return argtypes.toList(); |
duke@1 | 485 | } |
duke@1 | 486 | |
duke@1 | 487 | /** Attribute a type argument list, returning a list of types. |
jrose@267 | 488 | * Caller is responsible for calling checkRefTypes. |
duke@1 | 489 | */ |
jrose@267 | 490 | List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { |
duke@1 | 491 | ListBuffer<Type> argtypes = new ListBuffer<Type>(); |
duke@1 | 492 | for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) |
jrose@267 | 493 | argtypes.append(attribType(l.head, env)); |
duke@1 | 494 | return argtypes.toList(); |
duke@1 | 495 | } |
duke@1 | 496 | |
jrose@267 | 497 | /** Attribute a type argument list, returning a list of types. |
jrose@267 | 498 | * Check that all the types are references. |
jrose@267 | 499 | */ |
jrose@267 | 500 | List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { |
jrose@267 | 501 | List<Type> types = attribAnyTypes(trees, env); |
jrose@267 | 502 | return chk.checkRefTypes(trees, types); |
jrose@267 | 503 | } |
duke@1 | 504 | |
duke@1 | 505 | /** |
duke@1 | 506 | * Attribute type variables (of generic classes or methods). |
duke@1 | 507 | * Compound types are attributed later in attribBounds. |
duke@1 | 508 | * @param typarams the type variables to enter |
duke@1 | 509 | * @param env the current environment |
duke@1 | 510 | */ |
duke@1 | 511 | void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { |
duke@1 | 512 | for (JCTypeParameter tvar : typarams) { |
duke@1 | 513 | TypeVar a = (TypeVar)tvar.type; |
mcimadamore@42 | 514 | a.tsym.flags_field |= UNATTRIBUTED; |
mcimadamore@42 | 515 | a.bound = Type.noType; |
duke@1 | 516 | if (!tvar.bounds.isEmpty()) { |
duke@1 | 517 | List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); |
duke@1 | 518 | for (JCExpression bound : tvar.bounds.tail) |
duke@1 | 519 | bounds = bounds.prepend(attribType(bound, env)); |
duke@1 | 520 | types.setBounds(a, bounds.reverse()); |
duke@1 | 521 | } else { |
duke@1 | 522 | // if no bounds are given, assume a single bound of |
duke@1 | 523 | // java.lang.Object. |
duke@1 | 524 | types.setBounds(a, List.of(syms.objectType)); |
duke@1 | 525 | } |
mcimadamore@42 | 526 | a.tsym.flags_field &= ~UNATTRIBUTED; |
duke@1 | 527 | } |
duke@1 | 528 | for (JCTypeParameter tvar : typarams) |
duke@1 | 529 | chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); |
duke@1 | 530 | attribStats(typarams, env); |
mcimadamore@42 | 531 | } |
mcimadamore@42 | 532 | |
mcimadamore@42 | 533 | void attribBounds(List<JCTypeParameter> typarams) { |
duke@1 | 534 | for (JCTypeParameter typaram : typarams) { |
duke@1 | 535 | Type bound = typaram.type.getUpperBound(); |
duke@1 | 536 | if (bound != null && bound.tsym instanceof ClassSymbol) { |
duke@1 | 537 | ClassSymbol c = (ClassSymbol)bound.tsym; |
duke@1 | 538 | if ((c.flags_field & COMPOUND) != 0) { |
duke@1 | 539 | assert (c.flags_field & UNATTRIBUTED) != 0 : c; |
duke@1 | 540 | attribClass(typaram.pos(), c); |
duke@1 | 541 | } |
duke@1 | 542 | } |
duke@1 | 543 | } |
duke@1 | 544 | } |
duke@1 | 545 | |
duke@1 | 546 | /** |
duke@1 | 547 | * Attribute the type references in a list of annotations. |
duke@1 | 548 | */ |
duke@1 | 549 | void attribAnnotationTypes(List<JCAnnotation> annotations, |
duke@1 | 550 | Env<AttrContext> env) { |
duke@1 | 551 | for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { |
duke@1 | 552 | JCAnnotation a = al.head; |
duke@1 | 553 | attribType(a.annotationType, env); |
duke@1 | 554 | } |
duke@1 | 555 | } |
duke@1 | 556 | |
duke@1 | 557 | /** Attribute type reference in an `extends' or `implements' clause. |
mcimadamore@537 | 558 | * Supertypes of anonymous inner classes are usually already attributed. |
duke@1 | 559 | * |
duke@1 | 560 | * @param tree The tree making up the type reference. |
duke@1 | 561 | * @param env The environment current at the reference. |
duke@1 | 562 | * @param classExpected true if only a class is expected here. |
duke@1 | 563 | * @param interfaceExpected true if only an interface is expected here. |
duke@1 | 564 | */ |
duke@1 | 565 | Type attribBase(JCTree tree, |
duke@1 | 566 | Env<AttrContext> env, |
duke@1 | 567 | boolean classExpected, |
duke@1 | 568 | boolean interfaceExpected, |
duke@1 | 569 | boolean checkExtensible) { |
mcimadamore@537 | 570 | Type t = tree.type != null ? |
mcimadamore@537 | 571 | tree.type : |
mcimadamore@537 | 572 | attribType(tree, env); |
duke@1 | 573 | return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); |
duke@1 | 574 | } |
duke@1 | 575 | Type checkBase(Type t, |
duke@1 | 576 | JCTree tree, |
duke@1 | 577 | Env<AttrContext> env, |
duke@1 | 578 | boolean classExpected, |
duke@1 | 579 | boolean interfaceExpected, |
duke@1 | 580 | boolean checkExtensible) { |
duke@1 | 581 | if (t.tag == TYPEVAR && !classExpected && !interfaceExpected) { |
duke@1 | 582 | // check that type variable is already visible |
duke@1 | 583 | if (t.getUpperBound() == null) { |
duke@1 | 584 | log.error(tree.pos(), "illegal.forward.ref"); |
jjg@110 | 585 | return types.createErrorType(t); |
duke@1 | 586 | } |
duke@1 | 587 | } else { |
duke@1 | 588 | t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics); |
duke@1 | 589 | } |
duke@1 | 590 | if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { |
duke@1 | 591 | log.error(tree.pos(), "intf.expected.here"); |
duke@1 | 592 | // return errType is necessary since otherwise there might |
duke@1 | 593 | // be undetected cycles which cause attribution to loop |
jjg@110 | 594 | return types.createErrorType(t); |
duke@1 | 595 | } else if (checkExtensible && |
duke@1 | 596 | classExpected && |
duke@1 | 597 | (t.tsym.flags() & INTERFACE) != 0) { |
duke@1 | 598 | log.error(tree.pos(), "no.intf.expected.here"); |
jjg@110 | 599 | return types.createErrorType(t); |
duke@1 | 600 | } |
duke@1 | 601 | if (checkExtensible && |
duke@1 | 602 | ((t.tsym.flags() & FINAL) != 0)) { |
duke@1 | 603 | log.error(tree.pos(), |
duke@1 | 604 | "cant.inherit.from.final", t.tsym); |
duke@1 | 605 | } |
duke@1 | 606 | chk.checkNonCyclic(tree.pos(), t); |
duke@1 | 607 | return t; |
duke@1 | 608 | } |
duke@1 | 609 | |
duke@1 | 610 | public void visitClassDef(JCClassDecl tree) { |
duke@1 | 611 | // Local classes have not been entered yet, so we need to do it now: |
duke@1 | 612 | if ((env.info.scope.owner.kind & (VAR | MTH)) != 0) |
duke@1 | 613 | enter.classEnter(tree, env); |
duke@1 | 614 | |
duke@1 | 615 | ClassSymbol c = tree.sym; |
duke@1 | 616 | if (c == null) { |
duke@1 | 617 | // exit in case something drastic went wrong during enter. |
duke@1 | 618 | result = null; |
duke@1 | 619 | } else { |
duke@1 | 620 | // make sure class has been completed: |
duke@1 | 621 | c.complete(); |
duke@1 | 622 | |
duke@1 | 623 | // If this class appears as an anonymous class |
duke@1 | 624 | // in a superclass constructor call where |
duke@1 | 625 | // no explicit outer instance is given, |
duke@1 | 626 | // disable implicit outer instance from being passed. |
duke@1 | 627 | // (This would be an illegal access to "this before super"). |
duke@1 | 628 | if (env.info.isSelfCall && |
duke@1 | 629 | env.tree.getTag() == JCTree.NEWCLASS && |
duke@1 | 630 | ((JCNewClass) env.tree).encl == null) |
duke@1 | 631 | { |
duke@1 | 632 | c.flags_field |= NOOUTERTHIS; |
duke@1 | 633 | } |
duke@1 | 634 | attribClass(tree.pos(), c); |
duke@1 | 635 | result = tree.type = c.type; |
duke@1 | 636 | } |
duke@1 | 637 | } |
duke@1 | 638 | |
duke@1 | 639 | public void visitMethodDef(JCMethodDecl tree) { |
duke@1 | 640 | MethodSymbol m = tree.sym; |
duke@1 | 641 | |
duke@1 | 642 | Lint lint = env.info.lint.augment(m.attributes_field, m.flags()); |
duke@1 | 643 | Lint prevLint = chk.setLint(lint); |
duke@1 | 644 | try { |
duke@1 | 645 | chk.checkDeprecatedAnnotation(tree.pos(), m); |
duke@1 | 646 | |
mcimadamore@42 | 647 | attribBounds(tree.typarams); |
duke@1 | 648 | |
duke@1 | 649 | // If we override any other methods, check that we do so properly. |
duke@1 | 650 | // JLS ??? |
duke@1 | 651 | chk.checkOverride(tree, m); |
duke@1 | 652 | |
duke@1 | 653 | // Create a new environment with local scope |
duke@1 | 654 | // for attributing the method. |
duke@1 | 655 | Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); |
duke@1 | 656 | |
duke@1 | 657 | localEnv.info.lint = lint; |
duke@1 | 658 | |
duke@1 | 659 | // Enter all type parameters into the local method scope. |
duke@1 | 660 | for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) |
duke@1 | 661 | localEnv.info.scope.enterIfAbsent(l.head.type.tsym); |
duke@1 | 662 | |
duke@1 | 663 | ClassSymbol owner = env.enclClass.sym; |
duke@1 | 664 | if ((owner.flags() & ANNOTATION) != 0 && |
duke@1 | 665 | tree.params.nonEmpty()) |
duke@1 | 666 | log.error(tree.params.head.pos(), |
duke@1 | 667 | "intf.annotation.members.cant.have.params"); |
duke@1 | 668 | |
duke@1 | 669 | // Attribute all value parameters. |
duke@1 | 670 | for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { |
duke@1 | 671 | attribStat(l.head, localEnv); |
duke@1 | 672 | } |
duke@1 | 673 | |
mcimadamore@580 | 674 | chk.checkVarargMethodDecl(tree); |
mcimadamore@580 | 675 | |
duke@1 | 676 | // Check that type parameters are well-formed. |
mcimadamore@122 | 677 | chk.validate(tree.typarams, localEnv); |
duke@1 | 678 | if ((owner.flags() & ANNOTATION) != 0 && |
duke@1 | 679 | tree.typarams.nonEmpty()) |
duke@1 | 680 | log.error(tree.typarams.head.pos(), |
duke@1 | 681 | "intf.annotation.members.cant.have.type.params"); |
duke@1 | 682 | |
duke@1 | 683 | // Check that result type is well-formed. |
mcimadamore@122 | 684 | chk.validate(tree.restype, localEnv); |
duke@1 | 685 | if ((owner.flags() & ANNOTATION) != 0) |
duke@1 | 686 | chk.validateAnnotationType(tree.restype); |
duke@1 | 687 | |
duke@1 | 688 | if ((owner.flags() & ANNOTATION) != 0) |
duke@1 | 689 | chk.validateAnnotationMethod(tree.pos(), m); |
duke@1 | 690 | |
duke@1 | 691 | // Check that all exceptions mentioned in the throws clause extend |
duke@1 | 692 | // java.lang.Throwable. |
duke@1 | 693 | if ((owner.flags() & ANNOTATION) != 0 && tree.thrown.nonEmpty()) |
duke@1 | 694 | log.error(tree.thrown.head.pos(), |
duke@1 | 695 | "throws.not.allowed.in.intf.annotation"); |
duke@1 | 696 | for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) |
duke@1 | 697 | chk.checkType(l.head.pos(), l.head.type, syms.throwableType); |
duke@1 | 698 | |
duke@1 | 699 | if (tree.body == null) { |
duke@1 | 700 | // Empty bodies are only allowed for |
duke@1 | 701 | // abstract, native, or interface methods, or for methods |
duke@1 | 702 | // in a retrofit signature class. |
duke@1 | 703 | if ((owner.flags() & INTERFACE) == 0 && |
duke@1 | 704 | (tree.mods.flags & (ABSTRACT | NATIVE)) == 0 && |
duke@1 | 705 | !relax) |
duke@1 | 706 | log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); |
duke@1 | 707 | if (tree.defaultValue != null) { |
duke@1 | 708 | if ((owner.flags() & ANNOTATION) == 0) |
duke@1 | 709 | log.error(tree.pos(), |
duke@1 | 710 | "default.allowed.in.intf.annotation.member"); |
duke@1 | 711 | } |
duke@1 | 712 | } else if ((owner.flags() & INTERFACE) != 0) { |
duke@1 | 713 | log.error(tree.body.pos(), "intf.meth.cant.have.body"); |
duke@1 | 714 | } else if ((tree.mods.flags & ABSTRACT) != 0) { |
duke@1 | 715 | log.error(tree.pos(), "abstract.meth.cant.have.body"); |
duke@1 | 716 | } else if ((tree.mods.flags & NATIVE) != 0) { |
duke@1 | 717 | log.error(tree.pos(), "native.meth.cant.have.body"); |
duke@1 | 718 | } else { |
duke@1 | 719 | // Add an implicit super() call unless an explicit call to |
duke@1 | 720 | // super(...) or this(...) is given |
duke@1 | 721 | // or we are compiling class java.lang.Object. |
duke@1 | 722 | if (tree.name == names.init && owner.type != syms.objectType) { |
duke@1 | 723 | JCBlock body = tree.body; |
duke@1 | 724 | if (body.stats.isEmpty() || |
duke@1 | 725 | !TreeInfo.isSelfCall(body.stats.head)) { |
duke@1 | 726 | body.stats = body.stats. |
duke@1 | 727 | prepend(memberEnter.SuperCall(make.at(body.pos), |
duke@1 | 728 | List.<Type>nil(), |
duke@1 | 729 | List.<JCVariableDecl>nil(), |
duke@1 | 730 | false)); |
duke@1 | 731 | } else if ((env.enclClass.sym.flags() & ENUM) != 0 && |
duke@1 | 732 | (tree.mods.flags & GENERATEDCONSTR) == 0 && |
duke@1 | 733 | TreeInfo.isSuperCall(body.stats.head)) { |
duke@1 | 734 | // enum constructors are not allowed to call super |
duke@1 | 735 | // directly, so make sure there aren't any super calls |
duke@1 | 736 | // in enum constructors, except in the compiler |
duke@1 | 737 | // generated one. |
duke@1 | 738 | log.error(tree.body.stats.head.pos(), |
duke@1 | 739 | "call.to.super.not.allowed.in.enum.ctor", |
duke@1 | 740 | env.enclClass.sym); |
duke@1 | 741 | } |
duke@1 | 742 | } |
duke@1 | 743 | |
duke@1 | 744 | // Attribute method body. |
duke@1 | 745 | attribStat(tree.body, localEnv); |
duke@1 | 746 | } |
duke@1 | 747 | localEnv.info.scope.leave(); |
duke@1 | 748 | result = tree.type = m.type; |
duke@1 | 749 | chk.validateAnnotations(tree.mods.annotations, m); |
duke@1 | 750 | } |
duke@1 | 751 | finally { |
duke@1 | 752 | chk.setLint(prevLint); |
duke@1 | 753 | } |
duke@1 | 754 | } |
duke@1 | 755 | |
duke@1 | 756 | public void visitVarDef(JCVariableDecl tree) { |
duke@1 | 757 | // Local variables have not been entered yet, so we need to do it now: |
duke@1 | 758 | if (env.info.scope.owner.kind == MTH) { |
duke@1 | 759 | if (tree.sym != null) { |
duke@1 | 760 | // parameters have already been entered |
duke@1 | 761 | env.info.scope.enter(tree.sym); |
duke@1 | 762 | } else { |
duke@1 | 763 | memberEnter.memberEnter(tree, env); |
duke@1 | 764 | annotate.flush(); |
duke@1 | 765 | } |
duke@1 | 766 | } |
duke@1 | 767 | |
duke@1 | 768 | VarSymbol v = tree.sym; |
duke@1 | 769 | Lint lint = env.info.lint.augment(v.attributes_field, v.flags()); |
duke@1 | 770 | Lint prevLint = chk.setLint(lint); |
duke@1 | 771 | |
mcimadamore@165 | 772 | // Check that the variable's declared type is well-formed. |
mcimadamore@165 | 773 | chk.validate(tree.vartype, env); |
mcimadamore@165 | 774 | |
duke@1 | 775 | try { |
duke@1 | 776 | chk.checkDeprecatedAnnotation(tree.pos(), v); |
duke@1 | 777 | |
duke@1 | 778 | if (tree.init != null) { |
duke@1 | 779 | if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) { |
duke@1 | 780 | // In this case, `v' is final. Ensure that it's initializer is |
duke@1 | 781 | // evaluated. |
duke@1 | 782 | v.getConstValue(); // ensure initializer is evaluated |
duke@1 | 783 | } else { |
duke@1 | 784 | // Attribute initializer in a new environment |
duke@1 | 785 | // with the declared variable as owner. |
duke@1 | 786 | // Check that initializer conforms to variable's declared type. |
duke@1 | 787 | Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); |
duke@1 | 788 | initEnv.info.lint = lint; |
duke@1 | 789 | // In order to catch self-references, we set the variable's |
duke@1 | 790 | // declaration position to maximal possible value, effectively |
duke@1 | 791 | // marking the variable as undefined. |
mcimadamore@94 | 792 | initEnv.info.enclVar = v; |
duke@1 | 793 | attribExpr(tree.init, initEnv, v.type); |
duke@1 | 794 | } |
duke@1 | 795 | } |
duke@1 | 796 | result = tree.type = v.type; |
duke@1 | 797 | chk.validateAnnotations(tree.mods.annotations, v); |
duke@1 | 798 | } |
duke@1 | 799 | finally { |
duke@1 | 800 | chk.setLint(prevLint); |
duke@1 | 801 | } |
duke@1 | 802 | } |
duke@1 | 803 | |
duke@1 | 804 | public void visitSkip(JCSkip tree) { |
duke@1 | 805 | result = null; |
duke@1 | 806 | } |
duke@1 | 807 | |
duke@1 | 808 | public void visitBlock(JCBlock tree) { |
duke@1 | 809 | if (env.info.scope.owner.kind == TYP) { |
duke@1 | 810 | // Block is a static or instance initializer; |
duke@1 | 811 | // let the owner of the environment be a freshly |
duke@1 | 812 | // created BLOCK-method. |
duke@1 | 813 | Env<AttrContext> localEnv = |
duke@1 | 814 | env.dup(tree, env.info.dup(env.info.scope.dupUnshared())); |
duke@1 | 815 | localEnv.info.scope.owner = |
duke@1 | 816 | new MethodSymbol(tree.flags | BLOCK, names.empty, null, |
duke@1 | 817 | env.info.scope.owner); |
duke@1 | 818 | if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; |
duke@1 | 819 | attribStats(tree.stats, localEnv); |
duke@1 | 820 | } else { |
duke@1 | 821 | // Create a new local environment with a local scope. |
duke@1 | 822 | Env<AttrContext> localEnv = |
duke@1 | 823 | env.dup(tree, env.info.dup(env.info.scope.dup())); |
duke@1 | 824 | attribStats(tree.stats, localEnv); |
duke@1 | 825 | localEnv.info.scope.leave(); |
duke@1 | 826 | } |
duke@1 | 827 | result = null; |
duke@1 | 828 | } |
duke@1 | 829 | |
duke@1 | 830 | public void visitDoLoop(JCDoWhileLoop tree) { |
duke@1 | 831 | attribStat(tree.body, env.dup(tree)); |
duke@1 | 832 | attribExpr(tree.cond, env, syms.booleanType); |
duke@1 | 833 | result = null; |
duke@1 | 834 | } |
duke@1 | 835 | |
duke@1 | 836 | public void visitWhileLoop(JCWhileLoop tree) { |
duke@1 | 837 | attribExpr(tree.cond, env, syms.booleanType); |
duke@1 | 838 | attribStat(tree.body, env.dup(tree)); |
duke@1 | 839 | result = null; |
duke@1 | 840 | } |
duke@1 | 841 | |
duke@1 | 842 | public void visitForLoop(JCForLoop tree) { |
duke@1 | 843 | Env<AttrContext> loopEnv = |
duke@1 | 844 | env.dup(env.tree, env.info.dup(env.info.scope.dup())); |
duke@1 | 845 | attribStats(tree.init, loopEnv); |
duke@1 | 846 | if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); |
duke@1 | 847 | loopEnv.tree = tree; // before, we were not in loop! |
duke@1 | 848 | attribStats(tree.step, loopEnv); |
duke@1 | 849 | attribStat(tree.body, loopEnv); |
duke@1 | 850 | loopEnv.info.scope.leave(); |
duke@1 | 851 | result = null; |
duke@1 | 852 | } |
duke@1 | 853 | |
duke@1 | 854 | public void visitForeachLoop(JCEnhancedForLoop tree) { |
duke@1 | 855 | Env<AttrContext> loopEnv = |
duke@1 | 856 | env.dup(env.tree, env.info.dup(env.info.scope.dup())); |
duke@1 | 857 | attribStat(tree.var, loopEnv); |
duke@1 | 858 | Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv)); |
duke@1 | 859 | chk.checkNonVoid(tree.pos(), exprType); |
duke@1 | 860 | Type elemtype = types.elemtype(exprType); // perhaps expr is an array? |
duke@1 | 861 | if (elemtype == null) { |
duke@1 | 862 | // or perhaps expr implements Iterable<T>? |
duke@1 | 863 | Type base = types.asSuper(exprType, syms.iterableType.tsym); |
duke@1 | 864 | if (base == null) { |
duke@1 | 865 | log.error(tree.expr.pos(), "foreach.not.applicable.to.type"); |
jjg@110 | 866 | elemtype = types.createErrorType(exprType); |
duke@1 | 867 | } else { |
duke@1 | 868 | List<Type> iterableParams = base.allparams(); |
duke@1 | 869 | elemtype = iterableParams.isEmpty() |
duke@1 | 870 | ? syms.objectType |
duke@1 | 871 | : types.upperBound(iterableParams.head); |
duke@1 | 872 | } |
duke@1 | 873 | } |
duke@1 | 874 | chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); |
duke@1 | 875 | loopEnv.tree = tree; // before, we were not in loop! |
duke@1 | 876 | attribStat(tree.body, loopEnv); |
duke@1 | 877 | loopEnv.info.scope.leave(); |
duke@1 | 878 | result = null; |
duke@1 | 879 | } |
duke@1 | 880 | |
duke@1 | 881 | public void visitLabelled(JCLabeledStatement tree) { |
duke@1 | 882 | // Check that label is not used in an enclosing statement |
duke@1 | 883 | Env<AttrContext> env1 = env; |
duke@1 | 884 | while (env1 != null && env1.tree.getTag() != JCTree.CLASSDEF) { |
duke@1 | 885 | if (env1.tree.getTag() == JCTree.LABELLED && |
duke@1 | 886 | ((JCLabeledStatement) env1.tree).label == tree.label) { |
duke@1 | 887 | log.error(tree.pos(), "label.already.in.use", |
duke@1 | 888 | tree.label); |
duke@1 | 889 | break; |
duke@1 | 890 | } |
duke@1 | 891 | env1 = env1.next; |
duke@1 | 892 | } |
duke@1 | 893 | |
duke@1 | 894 | attribStat(tree.body, env.dup(tree)); |
duke@1 | 895 | result = null; |
duke@1 | 896 | } |
duke@1 | 897 | |
duke@1 | 898 | public void visitSwitch(JCSwitch tree) { |
duke@1 | 899 | Type seltype = attribExpr(tree.selector, env); |
duke@1 | 900 | |
duke@1 | 901 | Env<AttrContext> switchEnv = |
duke@1 | 902 | env.dup(tree, env.info.dup(env.info.scope.dup())); |
duke@1 | 903 | |
duke@1 | 904 | boolean enumSwitch = |
duke@1 | 905 | allowEnums && |
duke@1 | 906 | (seltype.tsym.flags() & Flags.ENUM) != 0; |
darcy@430 | 907 | boolean stringSwitch = false; |
darcy@430 | 908 | if (types.isSameType(seltype, syms.stringType)) { |
darcy@430 | 909 | if (allowStringsInSwitch) { |
darcy@430 | 910 | stringSwitch = true; |
darcy@430 | 911 | } else { |
darcy@430 | 912 | log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); |
darcy@430 | 913 | } |
darcy@430 | 914 | } |
darcy@430 | 915 | if (!enumSwitch && !stringSwitch) |
duke@1 | 916 | seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType); |
duke@1 | 917 | |
duke@1 | 918 | // Attribute all cases and |
duke@1 | 919 | // check that there are no duplicate case labels or default clauses. |
duke@1 | 920 | Set<Object> labels = new HashSet<Object>(); // The set of case labels. |
duke@1 | 921 | boolean hasDefault = false; // Is there a default label? |
duke@1 | 922 | for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) { |
duke@1 | 923 | JCCase c = l.head; |
duke@1 | 924 | Env<AttrContext> caseEnv = |
duke@1 | 925 | switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); |
duke@1 | 926 | if (c.pat != null) { |
duke@1 | 927 | if (enumSwitch) { |
duke@1 | 928 | Symbol sym = enumConstant(c.pat, seltype); |
duke@1 | 929 | if (sym == null) { |
duke@1 | 930 | log.error(c.pat.pos(), "enum.const.req"); |
duke@1 | 931 | } else if (!labels.add(sym)) { |
duke@1 | 932 | log.error(c.pos(), "duplicate.case.label"); |
duke@1 | 933 | } |
duke@1 | 934 | } else { |
duke@1 | 935 | Type pattype = attribExpr(c.pat, switchEnv, seltype); |
duke@1 | 936 | if (pattype.tag != ERROR) { |
duke@1 | 937 | if (pattype.constValue() == null) { |
darcy@430 | 938 | log.error(c.pat.pos(), |
darcy@430 | 939 | (stringSwitch ? "string.const.req" : "const.expr.req")); |
duke@1 | 940 | } else if (labels.contains(pattype.constValue())) { |
duke@1 | 941 | log.error(c.pos(), "duplicate.case.label"); |
duke@1 | 942 | } else { |
duke@1 | 943 | labels.add(pattype.constValue()); |
duke@1 | 944 | } |
duke@1 | 945 | } |
duke@1 | 946 | } |
duke@1 | 947 | } else if (hasDefault) { |
duke@1 | 948 | log.error(c.pos(), "duplicate.default.label"); |
duke@1 | 949 | } else { |
duke@1 | 950 | hasDefault = true; |
duke@1 | 951 | } |
duke@1 | 952 | attribStats(c.stats, caseEnv); |
duke@1 | 953 | caseEnv.info.scope.leave(); |
duke@1 | 954 | addVars(c.stats, switchEnv.info.scope); |
duke@1 | 955 | } |
duke@1 | 956 | |
duke@1 | 957 | switchEnv.info.scope.leave(); |
duke@1 | 958 | result = null; |
duke@1 | 959 | } |
duke@1 | 960 | // where |
duke@1 | 961 | /** Add any variables defined in stats to the switch scope. */ |
duke@1 | 962 | private static void addVars(List<JCStatement> stats, Scope switchScope) { |
duke@1 | 963 | for (;stats.nonEmpty(); stats = stats.tail) { |
duke@1 | 964 | JCTree stat = stats.head; |
duke@1 | 965 | if (stat.getTag() == JCTree.VARDEF) |
duke@1 | 966 | switchScope.enter(((JCVariableDecl) stat).sym); |
duke@1 | 967 | } |
duke@1 | 968 | } |
duke@1 | 969 | // where |
duke@1 | 970 | /** Return the selected enumeration constant symbol, or null. */ |
duke@1 | 971 | private Symbol enumConstant(JCTree tree, Type enumType) { |
duke@1 | 972 | if (tree.getTag() != JCTree.IDENT) { |
duke@1 | 973 | log.error(tree.pos(), "enum.label.must.be.unqualified.enum"); |
duke@1 | 974 | return syms.errSymbol; |
duke@1 | 975 | } |
duke@1 | 976 | JCIdent ident = (JCIdent)tree; |
duke@1 | 977 | Name name = ident.name; |
duke@1 | 978 | for (Scope.Entry e = enumType.tsym.members().lookup(name); |
duke@1 | 979 | e.scope != null; e = e.next()) { |
duke@1 | 980 | if (e.sym.kind == VAR) { |
duke@1 | 981 | Symbol s = ident.sym = e.sym; |
duke@1 | 982 | ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated |
duke@1 | 983 | ident.type = s.type; |
duke@1 | 984 | return ((s.flags_field & Flags.ENUM) == 0) |
duke@1 | 985 | ? null : s; |
duke@1 | 986 | } |
duke@1 | 987 | } |
duke@1 | 988 | return null; |
duke@1 | 989 | } |
duke@1 | 990 | |
duke@1 | 991 | public void visitSynchronized(JCSynchronized tree) { |
duke@1 | 992 | chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); |
duke@1 | 993 | attribStat(tree.body, env); |
duke@1 | 994 | result = null; |
duke@1 | 995 | } |
duke@1 | 996 | |
duke@1 | 997 | public void visitTry(JCTry tree) { |
darcy@609 | 998 | // Create a new local environment with a local |
darcy@609 | 999 | Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); |
darcy@609 | 1000 | boolean isTryWithResource = tree.resources.nonEmpty(); |
darcy@609 | 1001 | // Create a nested environment for attributing the try block if needed |
darcy@609 | 1002 | Env<AttrContext> tryEnv = isTryWithResource ? |
darcy@609 | 1003 | env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : |
darcy@609 | 1004 | localEnv; |
darcy@609 | 1005 | // Attribute resource declarations |
darcy@609 | 1006 | for (JCTree resource : tree.resources) { |
darcy@609 | 1007 | if (resource.getTag() == JCTree.VARDEF) { |
darcy@609 | 1008 | attribStat(resource, tryEnv); |
darcy@609 | 1009 | chk.checkType(resource, resource.type, syms.autoCloseableType, "twr.not.applicable.to.type"); |
darcy@609 | 1010 | VarSymbol var = (VarSymbol)TreeInfo.symbolFor(resource); |
darcy@609 | 1011 | var.setData(ElementKind.RESOURCE_VARIABLE); |
darcy@609 | 1012 | } else { |
darcy@609 | 1013 | attribExpr(resource, tryEnv, syms.autoCloseableType, "twr.not.applicable.to.type"); |
darcy@609 | 1014 | } |
darcy@609 | 1015 | } |
duke@1 | 1016 | // Attribute body |
darcy@609 | 1017 | attribStat(tree.body, tryEnv); |
darcy@609 | 1018 | if (isTryWithResource) |
darcy@609 | 1019 | tryEnv.info.scope.leave(); |
duke@1 | 1020 | |
duke@1 | 1021 | // Attribute catch clauses |
duke@1 | 1022 | for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { |
duke@1 | 1023 | JCCatch c = l.head; |
duke@1 | 1024 | Env<AttrContext> catchEnv = |
darcy@609 | 1025 | localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); |
duke@1 | 1026 | Type ctype = attribStat(c.param, catchEnv); |
mcimadamore@550 | 1027 | if (TreeInfo.isMultiCatch(c)) { |
mcimadamore@550 | 1028 | //check that multi-catch parameter is marked as final |
mcimadamore@550 | 1029 | if ((c.param.sym.flags() & FINAL) == 0) { |
mcimadamore@550 | 1030 | log.error(c.param.pos(), "multicatch.param.must.be.final", c.param.sym); |
mcimadamore@550 | 1031 | } |
mcimadamore@550 | 1032 | c.param.sym.flags_field = c.param.sym.flags() | DISJOINT; |
mcimadamore@550 | 1033 | } |
duke@1 | 1034 | if (c.param.type.tsym.kind == Kinds.VAR) { |
duke@1 | 1035 | c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); |
duke@1 | 1036 | } |
duke@1 | 1037 | chk.checkType(c.param.vartype.pos(), |
duke@1 | 1038 | chk.checkClassType(c.param.vartype.pos(), ctype), |
duke@1 | 1039 | syms.throwableType); |
duke@1 | 1040 | attribStat(c.body, catchEnv); |
duke@1 | 1041 | catchEnv.info.scope.leave(); |
duke@1 | 1042 | } |
duke@1 | 1043 | |
duke@1 | 1044 | // Attribute finalizer |
darcy@609 | 1045 | if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); |
darcy@609 | 1046 | |
darcy@609 | 1047 | localEnv.info.scope.leave(); |
duke@1 | 1048 | result = null; |
duke@1 | 1049 | } |
duke@1 | 1050 | |
duke@1 | 1051 | public void visitConditional(JCConditional tree) { |
duke@1 | 1052 | attribExpr(tree.cond, env, syms.booleanType); |
duke@1 | 1053 | attribExpr(tree.truepart, env); |
duke@1 | 1054 | attribExpr(tree.falsepart, env); |
duke@1 | 1055 | result = check(tree, |
duke@1 | 1056 | capture(condType(tree.pos(), tree.cond.type, |
duke@1 | 1057 | tree.truepart.type, tree.falsepart.type)), |
duke@1 | 1058 | VAL, pkind, pt); |
duke@1 | 1059 | } |
duke@1 | 1060 | //where |
duke@1 | 1061 | /** Compute the type of a conditional expression, after |
duke@1 | 1062 | * checking that it exists. See Spec 15.25. |
duke@1 | 1063 | * |
duke@1 | 1064 | * @param pos The source position to be used for |
duke@1 | 1065 | * error diagnostics. |
duke@1 | 1066 | * @param condtype The type of the expression's condition. |
duke@1 | 1067 | * @param thentype The type of the expression's then-part. |
duke@1 | 1068 | * @param elsetype The type of the expression's else-part. |
duke@1 | 1069 | */ |
duke@1 | 1070 | private Type condType(DiagnosticPosition pos, |
duke@1 | 1071 | Type condtype, |
duke@1 | 1072 | Type thentype, |
duke@1 | 1073 | Type elsetype) { |
duke@1 | 1074 | Type ctype = condType1(pos, condtype, thentype, elsetype); |
duke@1 | 1075 | |
duke@1 | 1076 | // If condition and both arms are numeric constants, |
duke@1 | 1077 | // evaluate at compile-time. |
duke@1 | 1078 | return ((condtype.constValue() != null) && |
duke@1 | 1079 | (thentype.constValue() != null) && |
duke@1 | 1080 | (elsetype.constValue() != null)) |
duke@1 | 1081 | ? cfolder.coerce(condtype.isTrue()?thentype:elsetype, ctype) |
duke@1 | 1082 | : ctype; |
duke@1 | 1083 | } |
duke@1 | 1084 | /** Compute the type of a conditional expression, after |
duke@1 | 1085 | * checking that it exists. Does not take into |
duke@1 | 1086 | * account the special case where condition and both arms |
duke@1 | 1087 | * are constants. |
duke@1 | 1088 | * |
duke@1 | 1089 | * @param pos The source position to be used for error |
duke@1 | 1090 | * diagnostics. |
duke@1 | 1091 | * @param condtype The type of the expression's condition. |
duke@1 | 1092 | * @param thentype The type of the expression's then-part. |
duke@1 | 1093 | * @param elsetype The type of the expression's else-part. |
duke@1 | 1094 | */ |
duke@1 | 1095 | private Type condType1(DiagnosticPosition pos, Type condtype, |
duke@1 | 1096 | Type thentype, Type elsetype) { |
duke@1 | 1097 | // If same type, that is the result |
duke@1 | 1098 | if (types.isSameType(thentype, elsetype)) |
duke@1 | 1099 | return thentype.baseType(); |
duke@1 | 1100 | |
duke@1 | 1101 | Type thenUnboxed = (!allowBoxing || thentype.isPrimitive()) |
duke@1 | 1102 | ? thentype : types.unboxedType(thentype); |
duke@1 | 1103 | Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive()) |
duke@1 | 1104 | ? elsetype : types.unboxedType(elsetype); |
duke@1 | 1105 | |
duke@1 | 1106 | // Otherwise, if both arms can be converted to a numeric |
duke@1 | 1107 | // type, return the least numeric type that fits both arms |
duke@1 | 1108 | // (i.e. return larger of the two, or return int if one |
duke@1 | 1109 | // arm is short, the other is char). |
duke@1 | 1110 | if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) { |
duke@1 | 1111 | // If one arm has an integer subrange type (i.e., byte, |
duke@1 | 1112 | // short, or char), and the other is an integer constant |
duke@1 | 1113 | // that fits into the subrange, return the subrange type. |
duke@1 | 1114 | if (thenUnboxed.tag < INT && elseUnboxed.tag == INT && |
duke@1 | 1115 | types.isAssignable(elseUnboxed, thenUnboxed)) |
duke@1 | 1116 | return thenUnboxed.baseType(); |
duke@1 | 1117 | if (elseUnboxed.tag < INT && thenUnboxed.tag == INT && |
duke@1 | 1118 | types.isAssignable(thenUnboxed, elseUnboxed)) |
duke@1 | 1119 | return elseUnboxed.baseType(); |
duke@1 | 1120 | |
duke@1 | 1121 | for (int i = BYTE; i < VOID; i++) { |
duke@1 | 1122 | Type candidate = syms.typeOfTag[i]; |
duke@1 | 1123 | if (types.isSubtype(thenUnboxed, candidate) && |
duke@1 | 1124 | types.isSubtype(elseUnboxed, candidate)) |
duke@1 | 1125 | return candidate; |
duke@1 | 1126 | } |
duke@1 | 1127 | } |
duke@1 | 1128 | |
duke@1 | 1129 | // Those were all the cases that could result in a primitive |
duke@1 | 1130 | if (allowBoxing) { |
duke@1 | 1131 | if (thentype.isPrimitive()) |
duke@1 | 1132 | thentype = types.boxedClass(thentype).type; |
duke@1 | 1133 | if (elsetype.isPrimitive()) |
duke@1 | 1134 | elsetype = types.boxedClass(elsetype).type; |
duke@1 | 1135 | } |
duke@1 | 1136 | |
duke@1 | 1137 | if (types.isSubtype(thentype, elsetype)) |
duke@1 | 1138 | return elsetype.baseType(); |
duke@1 | 1139 | if (types.isSubtype(elsetype, thentype)) |
duke@1 | 1140 | return thentype.baseType(); |
duke@1 | 1141 | |
duke@1 | 1142 | if (!allowBoxing || thentype.tag == VOID || elsetype.tag == VOID) { |
duke@1 | 1143 | log.error(pos, "neither.conditional.subtype", |
duke@1 | 1144 | thentype, elsetype); |
duke@1 | 1145 | return thentype.baseType(); |
duke@1 | 1146 | } |
duke@1 | 1147 | |
duke@1 | 1148 | // both are known to be reference types. The result is |
duke@1 | 1149 | // lub(thentype,elsetype). This cannot fail, as it will |
duke@1 | 1150 | // always be possible to infer "Object" if nothing better. |
duke@1 | 1151 | return types.lub(thentype.baseType(), elsetype.baseType()); |
duke@1 | 1152 | } |
duke@1 | 1153 | |
duke@1 | 1154 | public void visitIf(JCIf tree) { |
duke@1 | 1155 | attribExpr(tree.cond, env, syms.booleanType); |
duke@1 | 1156 | attribStat(tree.thenpart, env); |
duke@1 | 1157 | if (tree.elsepart != null) |
duke@1 | 1158 | attribStat(tree.elsepart, env); |
duke@1 | 1159 | chk.checkEmptyIf(tree); |
duke@1 | 1160 | result = null; |
duke@1 | 1161 | } |
duke@1 | 1162 | |
duke@1 | 1163 | public void visitExec(JCExpressionStatement tree) { |
duke@1 | 1164 | attribExpr(tree.expr, env); |
duke@1 | 1165 | result = null; |
duke@1 | 1166 | } |
duke@1 | 1167 | |
duke@1 | 1168 | public void visitBreak(JCBreak tree) { |
duke@1 | 1169 | tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); |
duke@1 | 1170 | result = null; |
duke@1 | 1171 | } |
duke@1 | 1172 | |
duke@1 | 1173 | public void visitContinue(JCContinue tree) { |
duke@1 | 1174 | tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); |
duke@1 | 1175 | result = null; |
duke@1 | 1176 | } |
duke@1 | 1177 | //where |
duke@1 | 1178 | /** Return the target of a break or continue statement, if it exists, |
duke@1 | 1179 | * report an error if not. |
duke@1 | 1180 | * Note: The target of a labelled break or continue is the |
duke@1 | 1181 | * (non-labelled) statement tree referred to by the label, |
duke@1 | 1182 | * not the tree representing the labelled statement itself. |
duke@1 | 1183 | * |
duke@1 | 1184 | * @param pos The position to be used for error diagnostics |
duke@1 | 1185 | * @param tag The tag of the jump statement. This is either |
duke@1 | 1186 | * Tree.BREAK or Tree.CONTINUE. |
duke@1 | 1187 | * @param label The label of the jump statement, or null if no |
duke@1 | 1188 | * label is given. |
duke@1 | 1189 | * @param env The environment current at the jump statement. |
duke@1 | 1190 | */ |
duke@1 | 1191 | private JCTree findJumpTarget(DiagnosticPosition pos, |
duke@1 | 1192 | int tag, |
duke@1 | 1193 | Name label, |
duke@1 | 1194 | Env<AttrContext> env) { |
duke@1 | 1195 | // Search environments outwards from the point of jump. |
duke@1 | 1196 | Env<AttrContext> env1 = env; |
duke@1 | 1197 | LOOP: |
duke@1 | 1198 | while (env1 != null) { |
duke@1 | 1199 | switch (env1.tree.getTag()) { |
duke@1 | 1200 | case JCTree.LABELLED: |
duke@1 | 1201 | JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; |
duke@1 | 1202 | if (label == labelled.label) { |
duke@1 | 1203 | // If jump is a continue, check that target is a loop. |
duke@1 | 1204 | if (tag == JCTree.CONTINUE) { |
duke@1 | 1205 | if (labelled.body.getTag() != JCTree.DOLOOP && |
duke@1 | 1206 | labelled.body.getTag() != JCTree.WHILELOOP && |
duke@1 | 1207 | labelled.body.getTag() != JCTree.FORLOOP && |
duke@1 | 1208 | labelled.body.getTag() != JCTree.FOREACHLOOP) |
duke@1 | 1209 | log.error(pos, "not.loop.label", label); |
duke@1 | 1210 | // Found labelled statement target, now go inwards |
duke@1 | 1211 | // to next non-labelled tree. |
duke@1 | 1212 | return TreeInfo.referencedStatement(labelled); |
duke@1 | 1213 | } else { |
duke@1 | 1214 | return labelled; |
duke@1 | 1215 | } |
duke@1 | 1216 | } |
duke@1 | 1217 | break; |
duke@1 | 1218 | case JCTree.DOLOOP: |
duke@1 | 1219 | case JCTree.WHILELOOP: |
duke@1 | 1220 | case JCTree.FORLOOP: |
duke@1 | 1221 | case JCTree.FOREACHLOOP: |
duke@1 | 1222 | if (label == null) return env1.tree; |
duke@1 | 1223 | break; |
duke@1 | 1224 | case JCTree.SWITCH: |
duke@1 | 1225 | if (label == null && tag == JCTree.BREAK) return env1.tree; |
duke@1 | 1226 | break; |
duke@1 | 1227 | case JCTree.METHODDEF: |
duke@1 | 1228 | case JCTree.CLASSDEF: |
duke@1 | 1229 | break LOOP; |
duke@1 | 1230 | default: |
duke@1 | 1231 | } |
duke@1 | 1232 | env1 = env1.next; |
duke@1 | 1233 | } |
duke@1 | 1234 | if (label != null) |
duke@1 | 1235 | log.error(pos, "undef.label", label); |
duke@1 | 1236 | else if (tag == JCTree.CONTINUE) |
duke@1 | 1237 | log.error(pos, "cont.outside.loop"); |
duke@1 | 1238 | else |
duke@1 | 1239 | log.error(pos, "break.outside.switch.loop"); |
duke@1 | 1240 | return null; |
duke@1 | 1241 | } |
duke@1 | 1242 | |
duke@1 | 1243 | public void visitReturn(JCReturn tree) { |
duke@1 | 1244 | // Check that there is an enclosing method which is |
duke@1 | 1245 | // nested within than the enclosing class. |
duke@1 | 1246 | if (env.enclMethod == null || |
duke@1 | 1247 | env.enclMethod.sym.owner != env.enclClass.sym) { |
duke@1 | 1248 | log.error(tree.pos(), "ret.outside.meth"); |
duke@1 | 1249 | |
duke@1 | 1250 | } else { |
duke@1 | 1251 | // Attribute return expression, if it exists, and check that |
duke@1 | 1252 | // it conforms to result type of enclosing method. |
duke@1 | 1253 | Symbol m = env.enclMethod.sym; |
duke@1 | 1254 | if (m.type.getReturnType().tag == VOID) { |
duke@1 | 1255 | if (tree.expr != null) |
duke@1 | 1256 | log.error(tree.expr.pos(), |
duke@1 | 1257 | "cant.ret.val.from.meth.decl.void"); |
duke@1 | 1258 | } else if (tree.expr == null) { |
duke@1 | 1259 | log.error(tree.pos(), "missing.ret.val"); |
duke@1 | 1260 | } else { |
duke@1 | 1261 | attribExpr(tree.expr, env, m.type.getReturnType()); |
duke@1 | 1262 | } |
duke@1 | 1263 | } |
duke@1 | 1264 | result = null; |
duke@1 | 1265 | } |
duke@1 | 1266 | |
duke@1 | 1267 | public void visitThrow(JCThrow tree) { |
duke@1 | 1268 | attribExpr(tree.expr, env, syms.throwableType); |
duke@1 | 1269 | result = null; |
duke@1 | 1270 | } |
duke@1 | 1271 | |
duke@1 | 1272 | public void visitAssert(JCAssert tree) { |
duke@1 | 1273 | attribExpr(tree.cond, env, syms.booleanType); |
duke@1 | 1274 | if (tree.detail != null) { |
duke@1 | 1275 | chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); |
duke@1 | 1276 | } |
duke@1 | 1277 | result = null; |
duke@1 | 1278 | } |
duke@1 | 1279 | |
duke@1 | 1280 | /** Visitor method for method invocations. |
duke@1 | 1281 | * NOTE: The method part of an application will have in its type field |
duke@1 | 1282 | * the return type of the method, not the method's type itself! |
duke@1 | 1283 | */ |
duke@1 | 1284 | public void visitApply(JCMethodInvocation tree) { |
duke@1 | 1285 | // The local environment of a method application is |
duke@1 | 1286 | // a new environment nested in the current one. |
duke@1 | 1287 | Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); |
duke@1 | 1288 | |
duke@1 | 1289 | // The types of the actual method arguments. |
duke@1 | 1290 | List<Type> argtypes; |
duke@1 | 1291 | |
duke@1 | 1292 | // The types of the actual method type arguments. |
duke@1 | 1293 | List<Type> typeargtypes = null; |
jrose@267 | 1294 | boolean typeargtypesNonRefOK = false; |
duke@1 | 1295 | |
duke@1 | 1296 | Name methName = TreeInfo.name(tree.meth); |
duke@1 | 1297 | |
duke@1 | 1298 | boolean isConstructorCall = |
duke@1 | 1299 | methName == names._this || methName == names._super; |
duke@1 | 1300 | |
duke@1 | 1301 | if (isConstructorCall) { |
duke@1 | 1302 | // We are seeing a ...this(...) or ...super(...) call. |
duke@1 | 1303 | // Check that this is the first statement in a constructor. |
duke@1 | 1304 | if (checkFirstConstructorStat(tree, env)) { |
duke@1 | 1305 | |
duke@1 | 1306 | // Record the fact |
duke@1 | 1307 | // that this is a constructor call (using isSelfCall). |
duke@1 | 1308 | localEnv.info.isSelfCall = true; |
duke@1 | 1309 | |
duke@1 | 1310 | // Attribute arguments, yielding list of argument types. |
duke@1 | 1311 | argtypes = attribArgs(tree.args, localEnv); |
duke@1 | 1312 | typeargtypes = attribTypes(tree.typeargs, localEnv); |
duke@1 | 1313 | |
duke@1 | 1314 | // Variable `site' points to the class in which the called |
duke@1 | 1315 | // constructor is defined. |
duke@1 | 1316 | Type site = env.enclClass.sym.type; |
duke@1 | 1317 | if (methName == names._super) { |
duke@1 | 1318 | if (site == syms.objectType) { |
duke@1 | 1319 | log.error(tree.meth.pos(), "no.superclass", site); |
jjg@110 | 1320 | site = types.createErrorType(syms.objectType); |
duke@1 | 1321 | } else { |
duke@1 | 1322 | site = types.supertype(site); |
duke@1 | 1323 | } |
duke@1 | 1324 | } |
duke@1 | 1325 | |
duke@1 | 1326 | if (site.tag == CLASS) { |
mcimadamore@361 | 1327 | Type encl = site.getEnclosingType(); |
mcimadamore@361 | 1328 | while (encl != null && encl.tag == TYPEVAR) |
mcimadamore@361 | 1329 | encl = encl.getUpperBound(); |
mcimadamore@361 | 1330 | if (encl.tag == CLASS) { |
duke@1 | 1331 | // we are calling a nested class |
duke@1 | 1332 | |
duke@1 | 1333 | if (tree.meth.getTag() == JCTree.SELECT) { |
duke@1 | 1334 | JCTree qualifier = ((JCFieldAccess) tree.meth).selected; |
duke@1 | 1335 | |
duke@1 | 1336 | // We are seeing a prefixed call, of the form |
duke@1 | 1337 | // <expr>.super(...). |
duke@1 | 1338 | // Check that the prefix expression conforms |
duke@1 | 1339 | // to the outer instance type of the class. |
duke@1 | 1340 | chk.checkRefType(qualifier.pos(), |
duke@1 | 1341 | attribExpr(qualifier, localEnv, |
mcimadamore@361 | 1342 | encl)); |
duke@1 | 1343 | } else if (methName == names._super) { |
duke@1 | 1344 | // qualifier omitted; check for existence |
duke@1 | 1345 | // of an appropriate implicit qualifier. |
duke@1 | 1346 | rs.resolveImplicitThis(tree.meth.pos(), |
duke@1 | 1347 | localEnv, site); |
duke@1 | 1348 | } |
duke@1 | 1349 | } else if (tree.meth.getTag() == JCTree.SELECT) { |
duke@1 | 1350 | log.error(tree.meth.pos(), "illegal.qual.not.icls", |
duke@1 | 1351 | site.tsym); |
duke@1 | 1352 | } |
duke@1 | 1353 | |
duke@1 | 1354 | // if we're calling a java.lang.Enum constructor, |
duke@1 | 1355 | // prefix the implicit String and int parameters |
duke@1 | 1356 | if (site.tsym == syms.enumSym && allowEnums) |
duke@1 | 1357 | argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); |
duke@1 | 1358 | |
duke@1 | 1359 | // Resolve the called constructor under the assumption |
duke@1 | 1360 | // that we are referring to a superclass instance of the |
duke@1 | 1361 | // current instance (JLS ???). |
duke@1 | 1362 | boolean selectSuperPrev = localEnv.info.selectSuper; |
duke@1 | 1363 | localEnv.info.selectSuper = true; |
duke@1 | 1364 | localEnv.info.varArgs = false; |
duke@1 | 1365 | Symbol sym = rs.resolveConstructor( |
duke@1 | 1366 | tree.meth.pos(), localEnv, site, argtypes, typeargtypes); |
duke@1 | 1367 | localEnv.info.selectSuper = selectSuperPrev; |
duke@1 | 1368 | |
duke@1 | 1369 | // Set method symbol to resolved constructor... |
duke@1 | 1370 | TreeInfo.setSymbol(tree.meth, sym); |
duke@1 | 1371 | |
duke@1 | 1372 | // ...and check that it is legal in the current context. |
duke@1 | 1373 | // (this will also set the tree's type) |
duke@1 | 1374 | Type mpt = newMethTemplate(argtypes, typeargtypes); |
duke@1 | 1375 | checkId(tree.meth, site, sym, localEnv, MTH, |
duke@1 | 1376 | mpt, tree.varargsElement != null); |
duke@1 | 1377 | } |
duke@1 | 1378 | // Otherwise, `site' is an error type and we do nothing |
duke@1 | 1379 | } |
duke@1 | 1380 | result = tree.type = syms.voidType; |
duke@1 | 1381 | } else { |
duke@1 | 1382 | // Otherwise, we are seeing a regular method call. |
duke@1 | 1383 | // Attribute the arguments, yielding list of argument types, ... |
duke@1 | 1384 | argtypes = attribArgs(tree.args, localEnv); |
jrose@267 | 1385 | typeargtypes = attribAnyTypes(tree.typeargs, localEnv); |
duke@1 | 1386 | |
duke@1 | 1387 | // ... and attribute the method using as a prototype a methodtype |
duke@1 | 1388 | // whose formal argument types is exactly the list of actual |
duke@1 | 1389 | // arguments (this will also set the method symbol). |
duke@1 | 1390 | Type mpt = newMethTemplate(argtypes, typeargtypes); |
duke@1 | 1391 | localEnv.info.varArgs = false; |
duke@1 | 1392 | Type mtype = attribExpr(tree.meth, localEnv, mpt); |
duke@1 | 1393 | if (localEnv.info.varArgs) |
duke@1 | 1394 | assert mtype.isErroneous() || tree.varargsElement != null; |
duke@1 | 1395 | |
duke@1 | 1396 | // Compute the result type. |
duke@1 | 1397 | Type restype = mtype.getReturnType(); |
duke@1 | 1398 | assert restype.tag != WILDCARD : mtype; |
duke@1 | 1399 | |
duke@1 | 1400 | // as a special case, array.clone() has a result that is |
duke@1 | 1401 | // the same as static type of the array being cloned |
duke@1 | 1402 | if (tree.meth.getTag() == JCTree.SELECT && |
duke@1 | 1403 | allowCovariantReturns && |
duke@1 | 1404 | methName == names.clone && |
duke@1 | 1405 | types.isArray(((JCFieldAccess) tree.meth).selected.type)) |
duke@1 | 1406 | restype = ((JCFieldAccess) tree.meth).selected.type; |
duke@1 | 1407 | |
duke@1 | 1408 | // as a special case, x.getClass() has type Class<? extends |X|> |
duke@1 | 1409 | if (allowGenerics && |
duke@1 | 1410 | methName == names.getClass && tree.args.isEmpty()) { |
duke@1 | 1411 | Type qualifier = (tree.meth.getTag() == JCTree.SELECT) |
duke@1 | 1412 | ? ((JCFieldAccess) tree.meth).selected.type |
duke@1 | 1413 | : env.enclClass.sym.type; |
duke@1 | 1414 | restype = new |
duke@1 | 1415 | ClassType(restype.getEnclosingType(), |
duke@1 | 1416 | List.<Type>of(new WildcardType(types.erasure(qualifier), |
duke@1 | 1417 | BoundKind.EXTENDS, |
duke@1 | 1418 | syms.boundClass)), |
duke@1 | 1419 | restype.tsym); |
duke@1 | 1420 | } |
duke@1 | 1421 | |
jrose@267 | 1422 | // as a special case, MethodHandle.<T>invoke(abc) and InvokeDynamic.<T>foo(abc) |
jrose@267 | 1423 | // has type <T>, and T can be a primitive type. |
jrose@267 | 1424 | if (tree.meth.getTag() == JCTree.SELECT && !typeargtypes.isEmpty()) { |
jrose@571 | 1425 | JCFieldAccess mfield = (JCFieldAccess) tree.meth; |
jrose@571 | 1426 | if ((mfield.selected.type.tsym != null && |
jrose@571 | 1427 | (mfield.selected.type.tsym.flags() & POLYMORPHIC_SIGNATURE) != 0) |
jrose@571 | 1428 | || |
jrose@571 | 1429 | (mfield.sym != null && |
jrose@571 | 1430 | (mfield.sym.flags() & POLYMORPHIC_SIGNATURE) != 0)) { |
jrose@267 | 1431 | assert types.isSameType(restype, typeargtypes.head) : mtype; |
jrose@571 | 1432 | assert mfield.selected.type == syms.methodHandleType |
jrose@571 | 1433 | || mfield.selected.type == syms.invokeDynamicType; |
jrose@267 | 1434 | typeargtypesNonRefOK = true; |
jrose@267 | 1435 | } |
jrose@267 | 1436 | } |
jrose@267 | 1437 | |
jrose@267 | 1438 | if (!typeargtypesNonRefOK) { |
jrose@267 | 1439 | chk.checkRefTypes(tree.typeargs, typeargtypes); |
jrose@267 | 1440 | } |
jrose@267 | 1441 | |
duke@1 | 1442 | // Check that value of resulting type is admissible in the |
duke@1 | 1443 | // current context. Also, capture the return type |
mcimadamore@536 | 1444 | result = check(tree, capture(restype), VAL, pkind, pt); |
duke@1 | 1445 | } |
mcimadamore@122 | 1446 | chk.validate(tree.typeargs, localEnv); |
duke@1 | 1447 | } |
duke@1 | 1448 | //where |
duke@1 | 1449 | /** Check that given application node appears as first statement |
duke@1 | 1450 | * in a constructor call. |
duke@1 | 1451 | * @param tree The application node |
duke@1 | 1452 | * @param env The environment current at the application. |
duke@1 | 1453 | */ |
duke@1 | 1454 | boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { |
duke@1 | 1455 | JCMethodDecl enclMethod = env.enclMethod; |
duke@1 | 1456 | if (enclMethod != null && enclMethod.name == names.init) { |
duke@1 | 1457 | JCBlock body = enclMethod.body; |
duke@1 | 1458 | if (body.stats.head.getTag() == JCTree.EXEC && |
duke@1 | 1459 | ((JCExpressionStatement) body.stats.head).expr == tree) |
duke@1 | 1460 | return true; |
duke@1 | 1461 | } |
duke@1 | 1462 | log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", |
duke@1 | 1463 | TreeInfo.name(tree.meth)); |
duke@1 | 1464 | return false; |
duke@1 | 1465 | } |
duke@1 | 1466 | |
duke@1 | 1467 | /** Obtain a method type with given argument types. |
duke@1 | 1468 | */ |
duke@1 | 1469 | Type newMethTemplate(List<Type> argtypes, List<Type> typeargtypes) { |
duke@1 | 1470 | MethodType mt = new MethodType(argtypes, null, null, syms.methodClass); |
duke@1 | 1471 | return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); |
duke@1 | 1472 | } |
duke@1 | 1473 | |
duke@1 | 1474 | public void visitNewClass(JCNewClass tree) { |
jjg@110 | 1475 | Type owntype = types.createErrorType(tree.type); |
duke@1 | 1476 | |
duke@1 | 1477 | // The local environment of a class creation is |
duke@1 | 1478 | // a new environment nested in the current one. |
duke@1 | 1479 | Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); |
duke@1 | 1480 | |
duke@1 | 1481 | // The anonymous inner class definition of the new expression, |
duke@1 | 1482 | // if one is defined by it. |
duke@1 | 1483 | JCClassDecl cdef = tree.def; |
duke@1 | 1484 | |
duke@1 | 1485 | // If enclosing class is given, attribute it, and |
duke@1 | 1486 | // complete class name to be fully qualified |
duke@1 | 1487 | JCExpression clazz = tree.clazz; // Class field following new |
duke@1 | 1488 | JCExpression clazzid = // Identifier in class field |
duke@1 | 1489 | (clazz.getTag() == JCTree.TYPEAPPLY) |
duke@1 | 1490 | ? ((JCTypeApply) clazz).clazz |
duke@1 | 1491 | : clazz; |
duke@1 | 1492 | |
duke@1 | 1493 | JCExpression clazzid1 = clazzid; // The same in fully qualified form |
duke@1 | 1494 | |
duke@1 | 1495 | if (tree.encl != null) { |
duke@1 | 1496 | // We are seeing a qualified new, of the form |
duke@1 | 1497 | // <expr>.new C <...> (...) ... |
duke@1 | 1498 | // In this case, we let clazz stand for the name of the |
duke@1 | 1499 | // allocated class C prefixed with the type of the qualifier |
duke@1 | 1500 | // expression, so that we can |
duke@1 | 1501 | // resolve it with standard techniques later. I.e., if |
duke@1 | 1502 | // <expr> has type T, then <expr>.new C <...> (...) |
duke@1 | 1503 | // yields a clazz T.C. |
duke@1 | 1504 | Type encltype = chk.checkRefType(tree.encl.pos(), |
duke@1 | 1505 | attribExpr(tree.encl, env)); |
duke@1 | 1506 | clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), |
duke@1 | 1507 | ((JCIdent) clazzid).name); |
duke@1 | 1508 | if (clazz.getTag() == JCTree.TYPEAPPLY) |
duke@1 | 1509 | clazz = make.at(tree.pos). |
duke@1 | 1510 | TypeApply(clazzid1, |
duke@1 | 1511 | ((JCTypeApply) clazz).arguments); |
duke@1 | 1512 | else |
duke@1 | 1513 | clazz = clazzid1; |
duke@1 | 1514 | } |
duke@1 | 1515 | |
duke@1 | 1516 | // Attribute clazz expression and store |
duke@1 | 1517 | // symbol + type back into the attributed tree. |
mcimadamore@537 | 1518 | Type clazztype = attribType(clazz, env); |
mcimadamore@562 | 1519 | Pair<Scope,Scope> mapping = getSyntheticScopeMapping(clazztype); |
mcimadamore@537 | 1520 | if (!TreeInfo.isDiamond(tree)) { |
mcimadamore@537 | 1521 | clazztype = chk.checkClassType( |
mcimadamore@537 | 1522 | tree.clazz.pos(), clazztype, true); |
mcimadamore@537 | 1523 | } |
mcimadamore@122 | 1524 | chk.validate(clazz, localEnv); |
duke@1 | 1525 | if (tree.encl != null) { |
duke@1 | 1526 | // We have to work in this case to store |
duke@1 | 1527 | // symbol + type back into the attributed tree. |
duke@1 | 1528 | tree.clazz.type = clazztype; |
duke@1 | 1529 | TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); |
duke@1 | 1530 | clazzid.type = ((JCIdent) clazzid).sym.type; |
duke@1 | 1531 | if (!clazztype.isErroneous()) { |
duke@1 | 1532 | if (cdef != null && clazztype.tsym.isInterface()) { |
duke@1 | 1533 | log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); |
duke@1 | 1534 | } else if (clazztype.tsym.isStatic()) { |
duke@1 | 1535 | log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); |
duke@1 | 1536 | } |
duke@1 | 1537 | } |
duke@1 | 1538 | } else if (!clazztype.tsym.isInterface() && |
duke@1 | 1539 | clazztype.getEnclosingType().tag == CLASS) { |
duke@1 | 1540 | // Check for the existence of an apropos outer instance |
duke@1 | 1541 | rs.resolveImplicitThis(tree.pos(), env, clazztype); |
duke@1 | 1542 | } |
duke@1 | 1543 | |
duke@1 | 1544 | // Attribute constructor arguments. |
duke@1 | 1545 | List<Type> argtypes = attribArgs(tree.args, localEnv); |
duke@1 | 1546 | List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); |
duke@1 | 1547 | |
mcimadamore@537 | 1548 | if (TreeInfo.isDiamond(tree)) { |
mcimadamore@537 | 1549 | clazztype = attribDiamond(localEnv, tree, clazztype, mapping, argtypes, typeargtypes, true); |
mcimadamore@537 | 1550 | clazz.type = clazztype; |
mcimadamore@537 | 1551 | } |
mcimadamore@537 | 1552 | |
duke@1 | 1553 | // If we have made no mistakes in the class type... |
duke@1 | 1554 | if (clazztype.tag == CLASS) { |
duke@1 | 1555 | // Enums may not be instantiated except implicitly |
duke@1 | 1556 | if (allowEnums && |
duke@1 | 1557 | (clazztype.tsym.flags_field&Flags.ENUM) != 0 && |
duke@1 | 1558 | (env.tree.getTag() != JCTree.VARDEF || |
duke@1 | 1559 | (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 || |
duke@1 | 1560 | ((JCVariableDecl) env.tree).init != tree)) |
duke@1 | 1561 | log.error(tree.pos(), "enum.cant.be.instantiated"); |
duke@1 | 1562 | // Check that class is not abstract |
duke@1 | 1563 | if (cdef == null && |
duke@1 | 1564 | (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { |
duke@1 | 1565 | log.error(tree.pos(), "abstract.cant.be.instantiated", |
duke@1 | 1566 | clazztype.tsym); |
duke@1 | 1567 | } else if (cdef != null && clazztype.tsym.isInterface()) { |
duke@1 | 1568 | // Check that no constructor arguments are given to |
duke@1 | 1569 | // anonymous classes implementing an interface |
duke@1 | 1570 | if (!argtypes.isEmpty()) |
duke@1 | 1571 | log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); |
duke@1 | 1572 | |
duke@1 | 1573 | if (!typeargtypes.isEmpty()) |
duke@1 | 1574 | log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); |
duke@1 | 1575 | |
duke@1 | 1576 | // Error recovery: pretend no arguments were supplied. |
duke@1 | 1577 | argtypes = List.nil(); |
duke@1 | 1578 | typeargtypes = List.nil(); |
duke@1 | 1579 | } |
duke@1 | 1580 | |
duke@1 | 1581 | // Resolve the called constructor under the assumption |
duke@1 | 1582 | // that we are referring to a superclass instance of the |
duke@1 | 1583 | // current instance (JLS ???). |
duke@1 | 1584 | else { |
duke@1 | 1585 | localEnv.info.selectSuper = cdef != null; |
duke@1 | 1586 | localEnv.info.varArgs = false; |
duke@1 | 1587 | tree.constructor = rs.resolveConstructor( |
duke@1 | 1588 | tree.pos(), localEnv, clazztype, argtypes, typeargtypes); |
mcimadamore@186 | 1589 | tree.constructorType = checkMethod(clazztype, |
mcimadamore@537 | 1590 | tree.constructor, |
mcimadamore@537 | 1591 | localEnv, |
mcimadamore@537 | 1592 | tree.args, |
mcimadamore@537 | 1593 | argtypes, |
mcimadamore@537 | 1594 | typeargtypes, |
mcimadamore@537 | 1595 | localEnv.info.varArgs); |
duke@1 | 1596 | if (localEnv.info.varArgs) |
mcimadamore@186 | 1597 | assert tree.constructorType.isErroneous() || tree.varargsElement != null; |
duke@1 | 1598 | } |
duke@1 | 1599 | |
duke@1 | 1600 | if (cdef != null) { |
duke@1 | 1601 | // We are seeing an anonymous class instance creation. |
duke@1 | 1602 | // In this case, the class instance creation |
duke@1 | 1603 | // expression |
duke@1 | 1604 | // |
duke@1 | 1605 | // E.new <typeargs1>C<typargs2>(args) { ... } |
duke@1 | 1606 | // |
duke@1 | 1607 | // is represented internally as |
duke@1 | 1608 | // |
duke@1 | 1609 | // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . |
duke@1 | 1610 | // |
duke@1 | 1611 | // This expression is then *transformed* as follows: |
duke@1 | 1612 | // |
duke@1 | 1613 | // (1) add a STATIC flag to the class definition |
duke@1 | 1614 | // if the current environment is static |
duke@1 | 1615 | // (2) add an extends or implements clause |
duke@1 | 1616 | // (3) add a constructor. |
duke@1 | 1617 | // |
duke@1 | 1618 | // For instance, if C is a class, and ET is the type of E, |
duke@1 | 1619 | // the expression |
duke@1 | 1620 | // |
duke@1 | 1621 | // E.new <typeargs1>C<typargs2>(args) { ... } |
duke@1 | 1622 | // |
duke@1 | 1623 | // is translated to (where X is a fresh name and typarams is the |
duke@1 | 1624 | // parameter list of the super constructor): |
duke@1 | 1625 | // |
duke@1 | 1626 | // new <typeargs1>X(<*nullchk*>E, args) where |
duke@1 | 1627 | // X extends C<typargs2> { |
duke@1 | 1628 | // <typarams> X(ET e, args) { |
duke@1 | 1629 | // e.<typeargs1>super(args) |
duke@1 | 1630 | // } |
duke@1 | 1631 | // ... |
duke@1 | 1632 | // } |
duke@1 | 1633 | if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC; |
mcimadamore@536 | 1634 | |
duke@1 | 1635 | if (clazztype.tsym.isInterface()) { |
duke@1 | 1636 | cdef.implementing = List.of(clazz); |
duke@1 | 1637 | } else { |
duke@1 | 1638 | cdef.extending = clazz; |
duke@1 | 1639 | } |
duke@1 | 1640 | |
duke@1 | 1641 | attribStat(cdef, localEnv); |
duke@1 | 1642 | |
duke@1 | 1643 | // If an outer instance is given, |
duke@1 | 1644 | // prefix it to the constructor arguments |
duke@1 | 1645 | // and delete it from the new expression |
duke@1 | 1646 | if (tree.encl != null && !clazztype.tsym.isInterface()) { |
duke@1 | 1647 | tree.args = tree.args.prepend(makeNullCheck(tree.encl)); |
duke@1 | 1648 | argtypes = argtypes.prepend(tree.encl.type); |
duke@1 | 1649 | tree.encl = null; |
duke@1 | 1650 | } |
duke@1 | 1651 | |
duke@1 | 1652 | // Reassign clazztype and recompute constructor. |
duke@1 | 1653 | clazztype = cdef.sym.type; |
duke@1 | 1654 | Symbol sym = rs.resolveConstructor( |
duke@1 | 1655 | tree.pos(), localEnv, clazztype, argtypes, |
duke@1 | 1656 | typeargtypes, true, tree.varargsElement != null); |
duke@1 | 1657 | assert sym.kind < AMBIGUOUS || tree.constructor.type.isErroneous(); |
duke@1 | 1658 | tree.constructor = sym; |
mcimadamore@358 | 1659 | if (tree.constructor.kind > ERRONEOUS) { |
mcimadamore@358 | 1660 | tree.constructorType = syms.errType; |
mcimadamore@358 | 1661 | } |
mcimadamore@358 | 1662 | else { |
mcimadamore@358 | 1663 | tree.constructorType = checkMethod(clazztype, |
mcimadamore@358 | 1664 | tree.constructor, |
mcimadamore@358 | 1665 | localEnv, |
mcimadamore@358 | 1666 | tree.args, |
mcimadamore@358 | 1667 | argtypes, |
mcimadamore@358 | 1668 | typeargtypes, |
mcimadamore@358 | 1669 | localEnv.info.varArgs); |
mcimadamore@358 | 1670 | } |
duke@1 | 1671 | } |
duke@1 | 1672 | |
duke@1 | 1673 | if (tree.constructor != null && tree.constructor.kind == MTH) |
duke@1 | 1674 | owntype = clazztype; |
duke@1 | 1675 | } |
duke@1 | 1676 | result = check(tree, owntype, VAL, pkind, pt); |
mcimadamore@122 | 1677 | chk.validate(tree.typeargs, localEnv); |
duke@1 | 1678 | } |
duke@1 | 1679 | |
mcimadamore@537 | 1680 | Type attribDiamond(Env<AttrContext> env, |
mcimadamore@537 | 1681 | JCNewClass tree, |
mcimadamore@537 | 1682 | Type clazztype, |
mcimadamore@537 | 1683 | Pair<Scope, Scope> mapping, |
mcimadamore@537 | 1684 | List<Type> argtypes, |
mcimadamore@537 | 1685 | List<Type> typeargtypes, |
mcimadamore@537 | 1686 | boolean reportErrors) { |
mcimadamore@562 | 1687 | if (clazztype.isErroneous() || mapping == erroneousMapping) { |
mcimadamore@562 | 1688 | //if the type of the instance creation expression is erroneous, |
mcimadamore@562 | 1689 | //or something prevented us to form a valid mapping, return the |
mcimadamore@562 | 1690 | //(possibly erroneous) type unchanged |
mcimadamore@537 | 1691 | return clazztype; |
mcimadamore@537 | 1692 | } |
mcimadamore@537 | 1693 | else if (clazztype.isInterface()) { |
mcimadamore@537 | 1694 | //if the type of the instance creation expression is an interface |
mcimadamore@537 | 1695 | //skip the method resolution step (JLS 15.12.2.7). The type to be |
mcimadamore@537 | 1696 | //inferred is of the kind <X1,X2, ... Xn>C<X1,X2, ... Xn> |
mcimadamore@615 | 1697 | clazztype = new ForAll(clazztype.tsym.type.allparams(), clazztype.tsym.type) { |
mcimadamore@615 | 1698 | @Override |
mcimadamore@615 | 1699 | public List<Type> getConstraints(TypeVar tv, ConstraintKind ck) { |
mcimadamore@615 | 1700 | switch (ck) { |
mcimadamore@615 | 1701 | case EXTENDS: return types.getBounds(tv); |
mcimadamore@615 | 1702 | default: return List.nil(); |
mcimadamore@615 | 1703 | } |
mcimadamore@615 | 1704 | } |
mcimadamore@615 | 1705 | @Override |
mcimadamore@615 | 1706 | public Type inst(List<Type> inferred, Types types) throws Infer.NoInstanceException { |
mcimadamore@615 | 1707 | // check that inferred bounds conform to their bounds |
mcimadamore@615 | 1708 | infer.checkWithinBounds(tvars, |
mcimadamore@615 | 1709 | types.subst(tvars, tvars, inferred), Warner.noWarnings); |
mcimadamore@615 | 1710 | return super.inst(inferred, types); |
mcimadamore@615 | 1711 | } |
mcimadamore@615 | 1712 | }; |
mcimadamore@537 | 1713 | } else { |
mcimadamore@537 | 1714 | //if the type of the instance creation expression is a class type |
mcimadamore@537 | 1715 | //apply method resolution inference (JLS 15.12.2.7). The return type |
mcimadamore@537 | 1716 | //of the resolved constructor will be a partially instantiated type |
mcimadamore@537 | 1717 | ((ClassSymbol) clazztype.tsym).members_field = mapping.snd; |
mcimadamore@537 | 1718 | Symbol constructor; |
mcimadamore@537 | 1719 | try { |
mcimadamore@537 | 1720 | constructor = rs.resolveDiamond(tree.pos(), |
mcimadamore@537 | 1721 | env, |
mcimadamore@537 | 1722 | clazztype.tsym.type, |
mcimadamore@537 | 1723 | argtypes, |
mcimadamore@537 | 1724 | typeargtypes, reportErrors); |
mcimadamore@537 | 1725 | } finally { |
mcimadamore@537 | 1726 | ((ClassSymbol) clazztype.tsym).members_field = mapping.fst; |
mcimadamore@537 | 1727 | } |
mcimadamore@537 | 1728 | if (constructor.kind == MTH) { |
mcimadamore@537 | 1729 | ClassType ct = new ClassType(clazztype.getEnclosingType(), |
mcimadamore@537 | 1730 | clazztype.tsym.type.getTypeArguments(), |
mcimadamore@537 | 1731 | clazztype.tsym); |
mcimadamore@537 | 1732 | clazztype = checkMethod(ct, |
mcimadamore@537 | 1733 | constructor, |
mcimadamore@537 | 1734 | env, |
mcimadamore@537 | 1735 | tree.args, |
mcimadamore@537 | 1736 | argtypes, |
mcimadamore@537 | 1737 | typeargtypes, |
mcimadamore@537 | 1738 | env.info.varArgs).getReturnType(); |
mcimadamore@537 | 1739 | } else { |
mcimadamore@537 | 1740 | clazztype = syms.errType; |
mcimadamore@537 | 1741 | } |
mcimadamore@537 | 1742 | } |
mcimadamore@537 | 1743 | if (clazztype.tag == FORALL && !pt.isErroneous()) { |
mcimadamore@537 | 1744 | //if the resolved constructor's return type has some uninferred |
mcimadamore@537 | 1745 | //type-variables, infer them using the expected type and declared |
mcimadamore@537 | 1746 | //bounds (JLS 15.12.2.8). |
mcimadamore@537 | 1747 | try { |
mcimadamore@537 | 1748 | clazztype = infer.instantiateExpr((ForAll) clazztype, |
mcimadamore@537 | 1749 | pt.tag == NONE ? syms.objectType : pt, |
mcimadamore@537 | 1750 | Warner.noWarnings); |
mcimadamore@537 | 1751 | } catch (Infer.InferenceException ex) { |
mcimadamore@537 | 1752 | //an error occurred while inferring uninstantiated type-variables |
mcimadamore@537 | 1753 | //we need to optionally report an error |
mcimadamore@537 | 1754 | if (reportErrors) { |
mcimadamore@537 | 1755 | log.error(tree.clazz.pos(), |
mcimadamore@537 | 1756 | "cant.apply.diamond.1", |
mcimadamore@537 | 1757 | diags.fragment("diamond", clazztype.tsym), |
mcimadamore@537 | 1758 | ex.diagnostic); |
mcimadamore@537 | 1759 | } |
mcimadamore@537 | 1760 | } |
mcimadamore@537 | 1761 | } |
mcimadamore@537 | 1762 | if (reportErrors) { |
mcimadamore@537 | 1763 | clazztype = chk.checkClassType(tree.clazz.pos(), |
mcimadamore@537 | 1764 | clazztype, |
mcimadamore@537 | 1765 | true); |
mcimadamore@537 | 1766 | if (clazztype.tag == CLASS) { |
mcimadamore@537 | 1767 | List<Type> invalidDiamondArgs = chk.checkDiamond((ClassType)clazztype); |
mcimadamore@537 | 1768 | if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { |
mcimadamore@537 | 1769 | //one or more types inferred in the previous steps is either a |
mcimadamore@537 | 1770 | //captured type or an intersection type --- we need to report an error. |
mcimadamore@537 | 1771 | String subkey = invalidDiamondArgs.size() > 1 ? |
mcimadamore@537 | 1772 | "diamond.invalid.args" : |
mcimadamore@537 | 1773 | "diamond.invalid.arg"; |
mcimadamore@537 | 1774 | //The error message is of the kind: |
mcimadamore@537 | 1775 | // |
mcimadamore@537 | 1776 | //cannot infer type arguments for {clazztype}<>; |
mcimadamore@537 | 1777 | //reason: {subkey} |
mcimadamore@537 | 1778 | // |
mcimadamore@537 | 1779 | //where subkey is a fragment of the kind: |
mcimadamore@537 | 1780 | // |
mcimadamore@537 | 1781 | //type argument(s) {invalidDiamondArgs} inferred for {clazztype}<> is not allowed in this context |
mcimadamore@537 | 1782 | log.error(tree.clazz.pos(), |
mcimadamore@537 | 1783 | "cant.apply.diamond.1", |
mcimadamore@537 | 1784 | diags.fragment("diamond", clazztype.tsym), |
mcimadamore@537 | 1785 | diags.fragment(subkey, |
mcimadamore@537 | 1786 | invalidDiamondArgs, |
mcimadamore@537 | 1787 | diags.fragment("diamond", clazztype.tsym))); |
mcimadamore@537 | 1788 | } |
mcimadamore@537 | 1789 | } |
mcimadamore@537 | 1790 | } |
mcimadamore@537 | 1791 | return clazztype; |
mcimadamore@537 | 1792 | } |
mcimadamore@537 | 1793 | |
mcimadamore@537 | 1794 | /** Creates a synthetic scope containing fake generic constructors. |
mcimadamore@537 | 1795 | * Assuming that the original scope contains a constructor of the kind: |
mcimadamore@537 | 1796 | * Foo(X x, Y y), where X,Y are class type-variables declared in Foo, |
mcimadamore@537 | 1797 | * the synthetic scope is added a generic constructor of the kind: |
mcimadamore@537 | 1798 | * <X,Y>Foo<X,Y>(X x, Y y). This is crucial in order to enable diamond |
mcimadamore@537 | 1799 | * inference. The inferred return type of the synthetic constructor IS |
mcimadamore@537 | 1800 | * the inferred type for the diamond operator. |
mcimadamore@537 | 1801 | */ |
mcimadamore@562 | 1802 | private Pair<Scope, Scope> getSyntheticScopeMapping(Type ctype) { |
mcimadamore@562 | 1803 | if (ctype.tag != CLASS) { |
mcimadamore@562 | 1804 | return erroneousMapping; |
mcimadamore@562 | 1805 | } |
mcimadamore@537 | 1806 | Pair<Scope, Scope> mapping = |
mcimadamore@537 | 1807 | new Pair<Scope, Scope>(ctype.tsym.members(), new Scope(ctype.tsym)); |
mcimadamore@537 | 1808 | List<Type> typevars = ctype.tsym.type.getTypeArguments(); |
mcimadamore@537 | 1809 | for (Scope.Entry e = mapping.fst.lookup(names.init); |
mcimadamore@537 | 1810 | e.scope != null; |
mcimadamore@537 | 1811 | e = e.next()) { |
mcimadamore@537 | 1812 | MethodSymbol newConstr = (MethodSymbol) e.sym.clone(ctype.tsym); |
mcimadamore@537 | 1813 | newConstr.name = names.init; |
mcimadamore@537 | 1814 | List<Type> oldTypeargs = List.nil(); |
mcimadamore@537 | 1815 | if (newConstr.type.tag == FORALL) { |
mcimadamore@537 | 1816 | oldTypeargs = ((ForAll) newConstr.type).tvars; |
mcimadamore@537 | 1817 | } |
mcimadamore@537 | 1818 | newConstr.type = new MethodType(newConstr.type.getParameterTypes(), |
mcimadamore@537 | 1819 | new ClassType(ctype.getEnclosingType(), ctype.tsym.type.getTypeArguments(), ctype.tsym), |
mcimadamore@537 | 1820 | newConstr.type.getThrownTypes(), |
mcimadamore@537 | 1821 | syms.methodClass); |
mcimadamore@537 | 1822 | newConstr.type = new ForAll(typevars.prependList(oldTypeargs), newConstr.type); |
mcimadamore@537 | 1823 | mapping.snd.enter(newConstr); |
mcimadamore@537 | 1824 | } |
mcimadamore@537 | 1825 | return mapping; |
mcimadamore@537 | 1826 | } |
mcimadamore@537 | 1827 | |
mcimadamore@562 | 1828 | private final Pair<Scope,Scope> erroneousMapping = new Pair<Scope,Scope>(null, null); |
mcimadamore@562 | 1829 | |
duke@1 | 1830 | /** Make an attributed null check tree. |
duke@1 | 1831 | */ |
duke@1 | 1832 | public JCExpression makeNullCheck(JCExpression arg) { |
duke@1 | 1833 | // optimization: X.this is never null; skip null check |
duke@1 | 1834 | Name name = TreeInfo.name(arg); |
duke@1 | 1835 | if (name == names._this || name == names._super) return arg; |
duke@1 | 1836 | |
duke@1 | 1837 | int optag = JCTree.NULLCHK; |
duke@1 | 1838 | JCUnary tree = make.at(arg.pos).Unary(optag, arg); |
duke@1 | 1839 | tree.operator = syms.nullcheck; |
duke@1 | 1840 | tree.type = arg.type; |
duke@1 | 1841 | return tree; |
duke@1 | 1842 | } |
duke@1 | 1843 | |
duke@1 | 1844 | public void visitNewArray(JCNewArray tree) { |
jjg@110 | 1845 | Type owntype = types.createErrorType(tree.type); |
duke@1 | 1846 | Type elemtype; |
duke@1 | 1847 | if (tree.elemtype != null) { |
duke@1 | 1848 | elemtype = attribType(tree.elemtype, env); |
mcimadamore@122 | 1849 | chk.validate(tree.elemtype, env); |
duke@1 | 1850 | owntype = elemtype; |
duke@1 | 1851 | for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { |
duke@1 | 1852 | attribExpr(l.head, env, syms.intType); |
duke@1 | 1853 | owntype = new ArrayType(owntype, syms.arrayClass); |
duke@1 | 1854 | } |
duke@1 | 1855 | } else { |
duke@1 | 1856 | // we are seeing an untyped aggregate { ... } |
duke@1 | 1857 | // this is allowed only if the prototype is an array |
duke@1 | 1858 | if (pt.tag == ARRAY) { |
duke@1 | 1859 | elemtype = types.elemtype(pt); |
duke@1 | 1860 | } else { |
duke@1 | 1861 | if (pt.tag != ERROR) { |
duke@1 | 1862 | log.error(tree.pos(), "illegal.initializer.for.type", |
duke@1 | 1863 | pt); |
duke@1 | 1864 | } |
jjg@110 | 1865 | elemtype = types.createErrorType(pt); |
duke@1 | 1866 | } |
duke@1 | 1867 | } |
duke@1 | 1868 | if (tree.elems != null) { |
duke@1 | 1869 | attribExprs(tree.elems, env, elemtype); |
duke@1 | 1870 | owntype = new ArrayType(elemtype, syms.arrayClass); |
duke@1 | 1871 | } |
duke@1 | 1872 | if (!types.isReifiable(elemtype)) |
duke@1 | 1873 | log.error(tree.pos(), "generic.array.creation"); |
duke@1 | 1874 | result = check(tree, owntype, VAL, pkind, pt); |
duke@1 | 1875 | } |
duke@1 | 1876 | |
duke@1 | 1877 | public void visitParens(JCParens tree) { |
duke@1 | 1878 | Type owntype = attribTree(tree.expr, env, pkind, pt); |
duke@1 | 1879 | result = check(tree, owntype, pkind, pkind, pt); |
duke@1 | 1880 | Symbol sym = TreeInfo.symbol(tree); |
duke@1 | 1881 | if (sym != null && (sym.kind&(TYP|PCK)) != 0) |
duke@1 | 1882 | log.error(tree.pos(), "illegal.start.of.type"); |
duke@1 | 1883 | } |
duke@1 | 1884 | |
duke@1 | 1885 | public void visitAssign(JCAssign tree) { |
duke@1 | 1886 | Type owntype = attribTree(tree.lhs, env.dup(tree), VAR, Type.noType); |
duke@1 | 1887 | Type capturedType = capture(owntype); |
duke@1 | 1888 | attribExpr(tree.rhs, env, owntype); |
duke@1 | 1889 | result = check(tree, capturedType, VAL, pkind, pt); |
duke@1 | 1890 | } |
duke@1 | 1891 | |
duke@1 | 1892 | public void visitAssignop(JCAssignOp tree) { |
duke@1 | 1893 | // Attribute arguments. |
duke@1 | 1894 | Type owntype = attribTree(tree.lhs, env, VAR, Type.noType); |
duke@1 | 1895 | Type operand = attribExpr(tree.rhs, env); |
duke@1 | 1896 | // Find operator. |
duke@1 | 1897 | Symbol operator = tree.operator = rs.resolveBinaryOperator( |
duke@1 | 1898 | tree.pos(), tree.getTag() - JCTree.ASGOffset, env, |
duke@1 | 1899 | owntype, operand); |
duke@1 | 1900 | |
duke@1 | 1901 | if (operator.kind == MTH) { |
duke@1 | 1902 | chk.checkOperator(tree.pos(), |
duke@1 | 1903 | (OperatorSymbol)operator, |
duke@1 | 1904 | tree.getTag() - JCTree.ASGOffset, |
duke@1 | 1905 | owntype, |
duke@1 | 1906 | operand); |
jjg@9 | 1907 | chk.checkDivZero(tree.rhs.pos(), operator, operand); |
jjg@9 | 1908 | chk.checkCastable(tree.rhs.pos(), |
jjg@9 | 1909 | operator.type.getReturnType(), |
jjg@9 | 1910 | owntype); |
duke@1 | 1911 | } |
duke@1 | 1912 | result = check(tree, owntype, VAL, pkind, pt); |
duke@1 | 1913 | } |
duke@1 | 1914 | |
duke@1 | 1915 | public void visitUnary(JCUnary tree) { |
duke@1 | 1916 | // Attribute arguments. |
duke@1 | 1917 | Type argtype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC) |
duke@1 | 1918 | ? attribTree(tree.arg, env, VAR, Type.noType) |
duke@1 | 1919 | : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); |
duke@1 | 1920 | |
duke@1 | 1921 | // Find operator. |
duke@1 | 1922 | Symbol operator = tree.operator = |
duke@1 | 1923 | rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype); |
duke@1 | 1924 | |
jjg@110 | 1925 | Type owntype = types.createErrorType(tree.type); |
duke@1 | 1926 | if (operator.kind == MTH) { |
duke@1 | 1927 | owntype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC) |
duke@1 | 1928 | ? tree.arg.type |
duke@1 | 1929 | : operator.type.getReturnType(); |
duke@1 | 1930 | int opc = ((OperatorSymbol)operator).opcode; |
duke@1 | 1931 | |
duke@1 | 1932 | // If the argument is constant, fold it. |
duke@1 | 1933 | if (argtype.constValue() != null) { |
duke@1 | 1934 | Type ctype = cfolder.fold1(opc, argtype); |
duke@1 | 1935 | if (ctype != null) { |
duke@1 | 1936 | owntype = cfolder.coerce(ctype, owntype); |
duke@1 | 1937 | |
duke@1 | 1938 | // Remove constant types from arguments to |
duke@1 | 1939 | // conserve space. The parser will fold concatenations |
duke@1 | 1940 | // of string literals; the code here also |
duke@1 | 1941 | // gets rid of intermediate results when some of the |
duke@1 | 1942 | // operands are constant identifiers. |
duke@1 | 1943 | if (tree.arg.type.tsym == syms.stringType.tsym) { |
duke@1 | 1944 | tree.arg.type = syms.stringType; |
duke@1 | 1945 | } |
duke@1 | 1946 | } |
duke@1 | 1947 | } |
duke@1 | 1948 | } |
duke@1 | 1949 | result = check(tree, owntype, VAL, pkind, pt); |
duke@1 | 1950 | } |
duke@1 | 1951 | |
duke@1 | 1952 | public void visitBinary(JCBinary tree) { |
duke@1 | 1953 | // Attribute arguments. |
duke@1 | 1954 | Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); |
duke@1 | 1955 | Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env)); |
duke@1 | 1956 | |
duke@1 | 1957 | // Find operator. |
duke@1 | 1958 | Symbol operator = tree.operator = |
duke@1 | 1959 | rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right); |
duke@1 | 1960 | |
jjg@110 | 1961 | Type owntype = types.createErrorType(tree.type); |
duke@1 | 1962 | if (operator.kind == MTH) { |
duke@1 | 1963 | owntype = operator.type.getReturnType(); |
duke@1 | 1964 | int opc = chk.checkOperator(tree.lhs.pos(), |
duke@1 | 1965 | (OperatorSymbol)operator, |
duke@1 | 1966 | tree.getTag(), |
duke@1 | 1967 | left, |
duke@1 | 1968 | right); |
duke@1 | 1969 | |
duke@1 | 1970 | // If both arguments are constants, fold them. |
duke@1 | 1971 | if (left.constValue() != null && right.constValue() != null) { |
duke@1 | 1972 | Type ctype = cfolder.fold2(opc, left, right); |
duke@1 | 1973 | if (ctype != null) { |
duke@1 | 1974 | owntype = cfolder.coerce(ctype, owntype); |
duke@1 | 1975 | |
duke@1 | 1976 | // Remove constant types from arguments to |
duke@1 | 1977 | // conserve space. The parser will fold concatenations |
duke@1 | 1978 | // of string literals; the code here also |
duke@1 | 1979 | // gets rid of intermediate results when some of the |
duke@1 | 1980 | // operands are constant identifiers. |
duke@1 | 1981 | if (tree.lhs.type.tsym == syms.stringType.tsym) { |
duke@1 | 1982 | tree.lhs.type = syms.stringType; |
duke@1 | 1983 | } |
duke@1 | 1984 | if (tree.rhs.type.tsym == syms.stringType.tsym) { |
duke@1 | 1985 | tree.rhs.type = syms.stringType; |
duke@1 | 1986 | } |
duke@1 | 1987 | } |
duke@1 | 1988 | } |
duke@1 | 1989 | |
duke@1 | 1990 | // Check that argument types of a reference ==, != are |
duke@1 | 1991 | // castable to each other, (JLS???). |
duke@1 | 1992 | if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { |
duke@1 | 1993 | if (!types.isCastable(left, right, new Warner(tree.pos()))) { |
duke@1 | 1994 | log.error(tree.pos(), "incomparable.types", left, right); |
duke@1 | 1995 | } |
duke@1 | 1996 | } |
duke@1 | 1997 | |
duke@1 | 1998 | chk.checkDivZero(tree.rhs.pos(), operator, right); |
duke@1 | 1999 | } |
duke@1 | 2000 | result = check(tree, owntype, VAL, pkind, pt); |
duke@1 | 2001 | } |
duke@1 | 2002 | |
duke@1 | 2003 | public void visitTypeCast(JCTypeCast tree) { |
duke@1 | 2004 | Type clazztype = attribType(tree.clazz, env); |
mcimadamore@122 | 2005 | chk.validate(tree.clazz, env); |
duke@1 | 2006 | Type exprtype = attribExpr(tree.expr, env, Infer.anyPoly); |
duke@1 | 2007 | Type owntype = chk.checkCastable(tree.expr.pos(), exprtype, clazztype); |
duke@1 | 2008 | if (exprtype.constValue() != null) |
duke@1 | 2009 | owntype = cfolder.coerce(exprtype, owntype); |
duke@1 | 2010 | result = check(tree, capture(owntype), VAL, pkind, pt); |
duke@1 | 2011 | } |
duke@1 | 2012 | |
duke@1 | 2013 | public void visitTypeTest(JCInstanceOf tree) { |
duke@1 | 2014 | Type exprtype = chk.checkNullOrRefType( |
duke@1 | 2015 | tree.expr.pos(), attribExpr(tree.expr, env)); |
duke@1 | 2016 | Type clazztype = chk.checkReifiableReferenceType( |
duke@1 | 2017 | tree.clazz.pos(), attribType(tree.clazz, env)); |
mcimadamore@122 | 2018 | chk.validate(tree.clazz, env); |
duke@1 | 2019 | chk.checkCastable(tree.expr.pos(), exprtype, clazztype); |
duke@1 | 2020 | result = check(tree, syms.booleanType, VAL, pkind, pt); |
duke@1 | 2021 | } |
duke@1 | 2022 | |
duke@1 | 2023 | public void visitIndexed(JCArrayAccess tree) { |
jjg@110 | 2024 | Type owntype = types.createErrorType(tree.type); |
duke@1 | 2025 | Type atype = attribExpr(tree.indexed, env); |
duke@1 | 2026 | attribExpr(tree.index, env, syms.intType); |
duke@1 | 2027 | if (types.isArray(atype)) |
duke@1 | 2028 | owntype = types.elemtype(atype); |
duke@1 | 2029 | else if (atype.tag != ERROR) |
duke@1 | 2030 | log.error(tree.pos(), "array.req.but.found", atype); |
duke@1 | 2031 | if ((pkind & VAR) == 0) owntype = capture(owntype); |
duke@1 | 2032 | result = check(tree, owntype, VAR, pkind, pt); |
duke@1 | 2033 | } |
duke@1 | 2034 | |
duke@1 | 2035 | public void visitIdent(JCIdent tree) { |
duke@1 | 2036 | Symbol sym; |
duke@1 | 2037 | boolean varArgs = false; |
duke@1 | 2038 | |
duke@1 | 2039 | // Find symbol |
duke@1 | 2040 | if (pt.tag == METHOD || pt.tag == FORALL) { |
duke@1 | 2041 | // If we are looking for a method, the prototype `pt' will be a |
duke@1 | 2042 | // method type with the type of the call's arguments as parameters. |
duke@1 | 2043 | env.info.varArgs = false; |
duke@1 | 2044 | sym = rs.resolveMethod(tree.pos(), env, tree.name, pt.getParameterTypes(), pt.getTypeArguments()); |
duke@1 | 2045 | varArgs = env.info.varArgs; |
duke@1 | 2046 | } else if (tree.sym != null && tree.sym.kind != VAR) { |
duke@1 | 2047 | sym = tree.sym; |
duke@1 | 2048 | } else { |
duke@1 | 2049 | sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind); |
duke@1 | 2050 | } |
duke@1 | 2051 | tree.sym = sym; |
duke@1 | 2052 | |
duke@1 | 2053 | // (1) Also find the environment current for the class where |
duke@1 | 2054 | // sym is defined (`symEnv'). |
duke@1 | 2055 | // Only for pre-tiger versions (1.4 and earlier): |
duke@1 | 2056 | // (2) Also determine whether we access symbol out of an anonymous |
duke@1 | 2057 | // class in a this or super call. This is illegal for instance |
duke@1 | 2058 | // members since such classes don't carry a this$n link. |
duke@1 | 2059 | // (`noOuterThisPath'). |
duke@1 | 2060 | Env<AttrContext> symEnv = env; |
duke@1 | 2061 | boolean noOuterThisPath = false; |
duke@1 | 2062 | if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class |
duke@1 | 2063 | (sym.kind & (VAR | MTH | TYP)) != 0 && |
duke@1 | 2064 | sym.owner.kind == TYP && |
duke@1 | 2065 | tree.name != names._this && tree.name != names._super) { |
duke@1 | 2066 | |
duke@1 | 2067 | // Find environment in which identifier is defined. |
duke@1 | 2068 | while (symEnv.outer != null && |
duke@1 | 2069 | !sym.isMemberOf(symEnv.enclClass.sym, types)) { |
duke@1 | 2070 | if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) |
duke@1 | 2071 | noOuterThisPath = !allowAnonOuterThis; |
duke@1 | 2072 | symEnv = symEnv.outer; |
duke@1 | 2073 | } |
duke@1 | 2074 | } |
duke@1 | 2075 | |
duke@1 | 2076 | // If symbol is a variable, ... |
duke@1 | 2077 | if (sym.kind == VAR) { |
duke@1 | 2078 | VarSymbol v = (VarSymbol)sym; |
duke@1 | 2079 | |
duke@1 | 2080 | // ..., evaluate its initializer, if it has one, and check for |
duke@1 | 2081 | // illegal forward reference. |
duke@1 | 2082 | checkInit(tree, env, v, false); |
duke@1 | 2083 | |
duke@1 | 2084 | // If symbol is a local variable accessed from an embedded |
duke@1 | 2085 | // inner class check that it is final. |
duke@1 | 2086 | if (v.owner.kind == MTH && |
duke@1 | 2087 | v.owner != env.info.scope.owner && |
duke@1 | 2088 | (v.flags_field & FINAL) == 0) { |
duke@1 | 2089 | log.error(tree.pos(), |
duke@1 | 2090 | "local.var.accessed.from.icls.needs.final", |
duke@1 | 2091 | v); |
duke@1 | 2092 | } |
duke@1 | 2093 | |
duke@1 | 2094 | // If we are expecting a variable (as opposed to a value), check |
duke@1 | 2095 | // that the variable is assignable in the current environment. |
duke@1 | 2096 | if (pkind == VAR) |
duke@1 | 2097 | checkAssignable(tree.pos(), v, null, env); |
duke@1 | 2098 | } |
duke@1 | 2099 | |
duke@1 | 2100 | // In a constructor body, |
duke@1 | 2101 | // if symbol is a field or instance method, check that it is |
duke@1 | 2102 | // not accessed before the supertype constructor is called. |
duke@1 | 2103 | if ((symEnv.info.isSelfCall || noOuterThisPath) && |
duke@1 | 2104 | (sym.kind & (VAR | MTH)) != 0 && |
duke@1 | 2105 | sym.owner.kind == TYP && |
duke@1 | 2106 | (sym.flags() & STATIC) == 0) { |
duke@1 | 2107 | chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env)); |
duke@1 | 2108 | } |
duke@1 | 2109 | Env<AttrContext> env1 = env; |
mcimadamore@28 | 2110 | if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) { |
duke@1 | 2111 | // If the found symbol is inaccessible, then it is |
duke@1 | 2112 | // accessed through an enclosing instance. Locate this |
duke@1 | 2113 | // enclosing instance: |
duke@1 | 2114 | while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) |
duke@1 | 2115 | env1 = env1.outer; |
duke@1 | 2116 | } |
duke@1 | 2117 | result = checkId(tree, env1.enclClass.sym.type, sym, env, pkind, pt, varArgs); |
duke@1 | 2118 | } |
duke@1 | 2119 | |
duke@1 | 2120 | public void visitSelect(JCFieldAccess tree) { |
duke@1 | 2121 | // Determine the expected kind of the qualifier expression. |
duke@1 | 2122 | int skind = 0; |
duke@1 | 2123 | if (tree.name == names._this || tree.name == names._super || |
duke@1 | 2124 | tree.name == names._class) |
duke@1 | 2125 | { |
duke@1 | 2126 | skind = TYP; |
duke@1 | 2127 | } else { |
duke@1 | 2128 | if ((pkind & PCK) != 0) skind = skind | PCK; |
duke@1 | 2129 | if ((pkind & TYP) != 0) skind = skind | TYP | PCK; |
duke@1 | 2130 | if ((pkind & (VAL | MTH)) != 0) skind = skind | VAL | TYP; |
duke@1 | 2131 | } |
duke@1 | 2132 | |
duke@1 | 2133 | // Attribute the qualifier expression, and determine its symbol (if any). |
duke@1 | 2134 | Type site = attribTree(tree.selected, env, skind, Infer.anyPoly); |
duke@1 | 2135 | if ((pkind & (PCK | TYP)) == 0) |
duke@1 | 2136 | site = capture(site); // Capture field access |
duke@1 | 2137 | |
duke@1 | 2138 | // don't allow T.class T[].class, etc |
duke@1 | 2139 | if (skind == TYP) { |
duke@1 | 2140 | Type elt = site; |
duke@1 | 2141 | while (elt.tag == ARRAY) |
duke@1 | 2142 | elt = ((ArrayType)elt).elemtype; |
duke@1 | 2143 | if (elt.tag == TYPEVAR) { |
duke@1 | 2144 | log.error(tree.pos(), "type.var.cant.be.deref"); |
jjg@110 | 2145 | result = types.createErrorType(tree.type); |
duke@1 | 2146 | return; |
duke@1 | 2147 | } |
duke@1 | 2148 | } |
duke@1 | 2149 | |
duke@1 | 2150 | // If qualifier symbol is a type or `super', assert `selectSuper' |
duke@1 | 2151 | // for the selection. This is relevant for determining whether |
duke@1 | 2152 | // protected symbols are accessible. |
duke@1 | 2153 | Symbol sitesym = TreeInfo.symbol(tree.selected); |
duke@1 | 2154 | boolean selectSuperPrev = env.info.selectSuper; |
duke@1 | 2155 | env.info.selectSuper = |
duke@1 | 2156 | sitesym != null && |
duke@1 | 2157 | sitesym.name == names._super; |
duke@1 | 2158 | |
duke@1 | 2159 | // If selected expression is polymorphic, strip |
duke@1 | 2160 | // type parameters and remember in env.info.tvars, so that |
duke@1 | 2161 | // they can be added later (in Attr.checkId and Infer.instantiateMethod). |
duke@1 | 2162 | if (tree.selected.type.tag == FORALL) { |
duke@1 | 2163 | ForAll pstype = (ForAll)tree.selected.type; |
duke@1 | 2164 | env.info.tvars = pstype.tvars; |
duke@1 | 2165 | site = tree.selected.type = pstype.qtype; |
duke@1 | 2166 | } |
duke@1 | 2167 | |
duke@1 | 2168 | // Determine the symbol represented by the selection. |
duke@1 | 2169 | env.info.varArgs = false; |
duke@1 | 2170 | Symbol sym = selectSym(tree, site, env, pt, pkind); |
duke@1 | 2171 | if (sym.exists() && !isType(sym) && (pkind & (PCK | TYP)) != 0) { |
duke@1 | 2172 | site = capture(site); |
duke@1 | 2173 | sym = selectSym(tree, site, env, pt, pkind); |
duke@1 | 2174 | } |
duke@1 | 2175 | boolean varArgs = env.info.varArgs; |
duke@1 | 2176 | tree.sym = sym; |
duke@1 | 2177 | |
mcimadamore@27 | 2178 | if (site.tag == TYPEVAR && !isType(sym) && sym.kind != ERR) { |
mcimadamore@27 | 2179 | while (site.tag == TYPEVAR) site = site.getUpperBound(); |
mcimadamore@27 | 2180 | site = capture(site); |
mcimadamore@27 | 2181 | } |
duke@1 | 2182 | |
duke@1 | 2183 | // If that symbol is a variable, ... |
duke@1 | 2184 | if (sym.kind == VAR) { |
duke@1 | 2185 | VarSymbol v = (VarSymbol)sym; |
duke@1 | 2186 | |
duke@1 | 2187 | // ..., evaluate its initializer, if it has one, and check for |
duke@1 | 2188 | // illegal forward reference. |
duke@1 | 2189 | checkInit(tree, env, v, true); |
duke@1 | 2190 | |
duke@1 | 2191 | // If we are expecting a variable (as opposed to a value), check |
duke@1 | 2192 | // that the variable is assignable in the current environment. |
duke@1 | 2193 | if (pkind == VAR) |
duke@1 | 2194 | checkAssignable(tree.pos(), v, tree.selected, env); |
duke@1 | 2195 | } |
duke@1 | 2196 | |
darcy@609 | 2197 | if (sitesym != null && |
darcy@609 | 2198 | sitesym.kind == VAR && |
darcy@609 | 2199 | ((VarSymbol)sitesym).isResourceVariable() && |
darcy@609 | 2200 | sym.kind == MTH && |
darcy@609 | 2201 | sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && |
darcy@609 | 2202 | env.info.lint.isEnabled(Lint.LintCategory.ARM)) { |
darcy@609 | 2203 | log.warning(tree, "twr.explicit.close.call"); |
darcy@609 | 2204 | } |
darcy@609 | 2205 | |
duke@1 | 2206 | // Disallow selecting a type from an expression |
duke@1 | 2207 | if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) { |
duke@1 | 2208 | tree.type = check(tree.selected, pt, |
duke@1 | 2209 | sitesym == null ? VAL : sitesym.kind, TYP|PCK, pt); |
duke@1 | 2210 | } |
duke@1 | 2211 | |
duke@1 | 2212 | if (isType(sitesym)) { |
duke@1 | 2213 | if (sym.name == names._this) { |
duke@1 | 2214 | // If `C' is the currently compiled class, check that |
duke@1 | 2215 | // C.this' does not appear in a call to a super(...) |
duke@1 | 2216 | if (env.info.isSelfCall && |
duke@1 | 2217 | site.tsym == env.enclClass.sym) { |
duke@1 | 2218 | chk.earlyRefError(tree.pos(), sym); |
duke@1 | 2219 | } |
duke@1 | 2220 | } else { |
duke@1 | 2221 | // Check if type-qualified fields or methods are static (JLS) |
duke@1 | 2222 | if ((sym.flags() & STATIC) == 0 && |
duke@1 | 2223 | sym.name != names._super && |
duke@1 | 2224 | (sym.kind == VAR || sym.kind == MTH)) { |
duke@1 | 2225 | rs.access(rs.new StaticError(sym), |
duke@1 | 2226 | tree.pos(), site, sym.name, true); |
duke@1 | 2227 | } |
duke@1 | 2228 | } |
jjg@505 | 2229 | } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) { |
jjg@505 | 2230 | // If the qualified item is not a type and the selected item is static, report |
jjg@505 | 2231 | // a warning. Make allowance for the class of an array type e.g. Object[].class) |
jjg@505 | 2232 | chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner); |
duke@1 | 2233 | } |
duke@1 | 2234 | |
duke@1 | 2235 | // If we are selecting an instance member via a `super', ... |
duke@1 | 2236 | if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { |
duke@1 | 2237 | |
duke@1 | 2238 | // Check that super-qualified symbols are not abstract (JLS) |
duke@1 | 2239 | rs.checkNonAbstract(tree.pos(), sym); |
duke@1 | 2240 | |
duke@1 | 2241 | if (site.isRaw()) { |
duke@1 | 2242 | // Determine argument types for site. |
duke@1 | 2243 | Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); |
duke@1 | 2244 | if (site1 != null) site = site1; |
duke@1 | 2245 | } |
duke@1 | 2246 | } |
duke@1 | 2247 | |
duke@1 | 2248 | env.info.selectSuper = selectSuperPrev; |
duke@1 | 2249 | result = checkId(tree, site, sym, env, pkind, pt, varArgs); |
duke@1 | 2250 | env.info.tvars = List.nil(); |
duke@1 | 2251 | } |
duke@1 | 2252 | //where |
duke@1 | 2253 | /** Determine symbol referenced by a Select expression, |
duke@1 | 2254 | * |
duke@1 | 2255 | * @param tree The select tree. |
duke@1 | 2256 | * @param site The type of the selected expression, |
duke@1 | 2257 | * @param env The current environment. |
duke@1 | 2258 | * @param pt The current prototype. |
duke@1 | 2259 | * @param pkind The expected kind(s) of the Select expression. |
duke@1 | 2260 | */ |
duke@1 | 2261 | private Symbol selectSym(JCFieldAccess tree, |
duke@1 | 2262 | Type site, |
duke@1 | 2263 | Env<AttrContext> env, |
duke@1 | 2264 | Type pt, |
duke@1 | 2265 | int pkind) { |
duke@1 | 2266 | DiagnosticPosition pos = tree.pos(); |
duke@1 | 2267 | Name name = tree.name; |
duke@1 | 2268 | |
duke@1 | 2269 | switch (site.tag) { |
duke@1 | 2270 | case PACKAGE: |
duke@1 | 2271 | return rs.access( |
duke@1 | 2272 | rs.findIdentInPackage(env, site.tsym, name, pkind), |
duke@1 | 2273 | pos, site, name, true); |
duke@1 | 2274 | case ARRAY: |
duke@1 | 2275 | case CLASS: |
duke@1 | 2276 | if (pt.tag == METHOD || pt.tag == FORALL) { |
duke@1 | 2277 | return rs.resolveQualifiedMethod( |
duke@1 | 2278 | pos, env, site, name, pt.getParameterTypes(), pt.getTypeArguments()); |
duke@1 | 2279 | } else if (name == names._this || name == names._super) { |
duke@1 | 2280 | return rs.resolveSelf(pos, env, site.tsym, name); |
duke@1 | 2281 | } else if (name == names._class) { |
duke@1 | 2282 | // In this case, we have already made sure in |
duke@1 | 2283 | // visitSelect that qualifier expression is a type. |
duke@1 | 2284 | Type t = syms.classType; |
duke@1 | 2285 | List<Type> typeargs = allowGenerics |
duke@1 | 2286 | ? List.of(types.erasure(site)) |
duke@1 | 2287 | : List.<Type>nil(); |
duke@1 | 2288 | t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); |
duke@1 | 2289 | return new VarSymbol( |
duke@1 | 2290 | STATIC | PUBLIC | FINAL, names._class, t, site.tsym); |
duke@1 | 2291 | } else { |
duke@1 | 2292 | // We are seeing a plain identifier as selector. |
duke@1 | 2293 | Symbol sym = rs.findIdentInType(env, site, name, pkind); |
duke@1 | 2294 | if ((pkind & ERRONEOUS) == 0) |
duke@1 | 2295 | sym = rs.access(sym, pos, site, name, true); |
duke@1 | 2296 | return sym; |
duke@1 | 2297 | } |
duke@1 | 2298 | case WILDCARD: |
duke@1 | 2299 | throw new AssertionError(tree); |
duke@1 | 2300 | case TYPEVAR: |
duke@1 | 2301 | // Normally, site.getUpperBound() shouldn't be null. |
duke@1 | 2302 | // It should only happen during memberEnter/attribBase |
duke@1 | 2303 | // when determining the super type which *must* be |
duke@1 | 2304 | // done before attributing the type variables. In |
duke@1 | 2305 | // other words, we are seeing this illegal program: |
duke@1 | 2306 | // class B<T> extends A<T.foo> {} |
duke@1 | 2307 | Symbol sym = (site.getUpperBound() != null) |
duke@1 | 2308 | ? selectSym(tree, capture(site.getUpperBound()), env, pt, pkind) |
duke@1 | 2309 | : null; |
mcimadamore@361 | 2310 | if (sym == null) { |
duke@1 | 2311 | log.error(pos, "type.var.cant.be.deref"); |
duke@1 | 2312 | return syms.errSymbol; |
duke@1 | 2313 | } else { |
mcimadamore@155 | 2314 | Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? |
mcimadamore@155 | 2315 | rs.new AccessError(env, site, sym) : |
mcimadamore@155 | 2316 | sym; |
mcimadamore@155 | 2317 | rs.access(sym2, pos, site, name, true); |
duke@1 | 2318 | return sym; |
duke@1 | 2319 | } |
duke@1 | 2320 | case ERROR: |
duke@1 | 2321 | // preserve identifier names through errors |
jjg@110 | 2322 | return types.createErrorType(name, site.tsym, site).tsym; |
duke@1 | 2323 | default: |
duke@1 | 2324 | // The qualifier expression is of a primitive type -- only |
duke@1 | 2325 | // .class is allowed for these. |
duke@1 | 2326 | if (name == names._class) { |
duke@1 | 2327 | // In this case, we have already made sure in Select that |
duke@1 | 2328 | // qualifier expression is a type. |
duke@1 | 2329 | Type t = syms.classType; |
duke@1 | 2330 | Type arg = types.boxedClass(site).type; |
duke@1 | 2331 | t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); |
duke@1 | 2332 | return new VarSymbol( |
duke@1 | 2333 | STATIC | PUBLIC | FINAL, names._class, t, site.tsym); |
duke@1 | 2334 | } else { |
duke@1 | 2335 | log.error(pos, "cant.deref", site); |
duke@1 | 2336 | return syms.errSymbol; |
duke@1 | 2337 | } |
duke@1 | 2338 | } |
duke@1 | 2339 | } |
duke@1 | 2340 | |
duke@1 | 2341 | /** Determine type of identifier or select expression and check that |
duke@1 | 2342 | * (1) the referenced symbol is not deprecated |
duke@1 | 2343 | * (2) the symbol's type is safe (@see checkSafe) |
duke@1 | 2344 | * (3) if symbol is a variable, check that its type and kind are |
duke@1 | 2345 | * compatible with the prototype and protokind. |
duke@1 | 2346 | * (4) if symbol is an instance field of a raw type, |
duke@1 | 2347 | * which is being assigned to, issue an unchecked warning if its |
duke@1 | 2348 | * type changes under erasure. |
duke@1 | 2349 | * (5) if symbol is an instance method of a raw type, issue an |
duke@1 | 2350 | * unchecked warning if its argument types change under erasure. |
duke@1 | 2351 | * If checks succeed: |
duke@1 | 2352 | * If symbol is a constant, return its constant type |
duke@1 | 2353 | * else if symbol is a method, return its result type |
duke@1 | 2354 | * otherwise return its type. |
duke@1 | 2355 | * Otherwise return errType. |
duke@1 | 2356 | * |
duke@1 | 2357 | * @param tree The syntax tree representing the identifier |
duke@1 | 2358 | * @param site If this is a select, the type of the selected |
duke@1 | 2359 | * expression, otherwise the type of the current class. |
duke@1 | 2360 | * @param sym The symbol representing the identifier. |
duke@1 | 2361 | * @param env The current environment. |
duke@1 | 2362 | * @param pkind The set of expected kinds. |
duke@1 | 2363 | * @param pt The expected type. |
duke@1 | 2364 | */ |
duke@1 | 2365 | Type checkId(JCTree tree, |
duke@1 | 2366 | Type site, |
duke@1 | 2367 | Symbol sym, |
duke@1 | 2368 | Env<AttrContext> env, |
duke@1 | 2369 | int pkind, |
duke@1 | 2370 | Type pt, |
duke@1 | 2371 | boolean useVarargs) { |
jjg@110 | 2372 | if (pt.isErroneous()) return types.createErrorType(site); |
duke@1 | 2373 | Type owntype; // The computed type of this identifier occurrence. |
duke@1 | 2374 | switch (sym.kind) { |
duke@1 | 2375 | case TYP: |
duke@1 | 2376 | // For types, the computed type equals the symbol's type, |
duke@1 | 2377 | // except for two situations: |
duke@1 | 2378 | owntype = sym.type; |
duke@1 | 2379 | if (owntype.tag == CLASS) { |
duke@1 | 2380 | Type ownOuter = owntype.getEnclosingType(); |
duke@1 | 2381 | |
duke@1 | 2382 | // (a) If the symbol's type is parameterized, erase it |
duke@1 | 2383 | // because no type parameters were given. |
duke@1 | 2384 | // We recover generic outer type later in visitTypeApply. |
duke@1 | 2385 | if (owntype.tsym.type.getTypeArguments().nonEmpty()) { |
duke@1 | 2386 | owntype = types.erasure(owntype); |
duke@1 | 2387 | } |
duke@1 | 2388 | |
duke@1 | 2389 | // (b) If the symbol's type is an inner class, then |
duke@1 | 2390 | // we have to interpret its outer type as a superclass |
duke@1 | 2391 | // of the site type. Example: |
duke@1 | 2392 | // |
duke@1 | 2393 | // class Tree<A> { class Visitor { ... } } |
duke@1 | 2394 | // class PointTree extends Tree<Point> { ... } |
duke@1 | 2395 | // ...PointTree.Visitor... |
duke@1 | 2396 | // |
duke@1 | 2397 | // Then the type of the last expression above is |
duke@1 | 2398 | // Tree<Point>.Visitor. |
duke@1 | 2399 | else if (ownOuter.tag == CLASS && site != ownOuter) { |
duke@1 | 2400 | Type normOuter = site; |
duke@1 | 2401 | if (normOuter.tag == CLASS) |
duke@1 | 2402 | normOuter = types.asEnclosingSuper(site, ownOuter.tsym); |
duke@1 | 2403 | if (normOuter == null) // perhaps from an import |
duke@1 | 2404 | normOuter = types.erasure(ownOuter); |
duke@1 | 2405 | if (normOuter != ownOuter) |
duke@1 | 2406 | owntype = new ClassType( |
duke@1 | 2407 | normOuter, List.<Type>nil(), owntype.tsym); |
duke@1 | 2408 | } |
duke@1 | 2409 | } |
duke@1 | 2410 | break; |
duke@1 | 2411 | case VAR: |
duke@1 | 2412 | VarSymbol v = (VarSymbol)sym; |
duke@1 | 2413 | // Test (4): if symbol is an instance field of a raw type, |
duke@1 | 2414 | // which is being assigned to, issue an unchecked warning if |
duke@1 | 2415 | // its type changes under erasure. |
duke@1 | 2416 | if (allowGenerics && |
duke@1 | 2417 | pkind == VAR && |
duke@1 | 2418 | v.owner.kind == TYP && |
duke@1 | 2419 | (v.flags() & STATIC) == 0 && |
duke@1 | 2420 | (site.tag == CLASS || site.tag == TYPEVAR)) { |
duke@1 | 2421 | Type s = types.asOuterSuper(site, v.owner); |
duke@1 | 2422 | if (s != null && |
duke@1 | 2423 | s.isRaw() && |
duke@1 | 2424 | !types.isSameType(v.type, v.erasure(types))) { |
duke@1 | 2425 | chk.warnUnchecked(tree.pos(), |
duke@1 | 2426 | "unchecked.assign.to.var", |
duke@1 | 2427 | v, s); |
duke@1 | 2428 | } |
duke@1 | 2429 | } |
duke@1 | 2430 | // The computed type of a variable is the type of the |
duke@1 | 2431 | // variable symbol, taken as a member of the site type. |
duke@1 | 2432 | owntype = (sym.owner.kind == TYP && |
duke@1 | 2433 | sym.name != names._this && sym.name != names._super) |
duke@1 | 2434 | ? types.memberType(site, sym) |
duke@1 | 2435 | : sym.type; |
duke@1 | 2436 | |
duke@1 | 2437 | if (env.info.tvars.nonEmpty()) { |
duke@1 | 2438 | Type owntype1 = new ForAll(env.info.tvars, owntype); |
duke@1 | 2439 | for (List<Type> l = env.info.tvars; l.nonEmpty(); l = l.tail) |
duke@1 | 2440 | if (!owntype.contains(l.head)) { |
duke@1 | 2441 | log.error(tree.pos(), "undetermined.type", owntype1); |
jjg@110 | 2442 | owntype1 = types.createErrorType(owntype1); |
duke@1 | 2443 | } |
duke@1 | 2444 | owntype = owntype1; |
duke@1 | 2445 | } |
duke@1 | 2446 | |
duke@1 | 2447 | // If the variable is a constant, record constant value in |
duke@1 | 2448 | // computed type. |
duke@1 | 2449 | if (v.getConstValue() != null && isStaticReference(tree)) |
duke@1 | 2450 | owntype = owntype.constType(v.getConstValue()); |
duke@1 | 2451 | |
duke@1 | 2452 | if (pkind == VAL) { |
duke@1 | 2453 | owntype = capture(owntype); // capture "names as expressions" |
duke@1 | 2454 | } |
duke@1 | 2455 | break; |
duke@1 | 2456 | case MTH: { |
duke@1 | 2457 | JCMethodInvocation app = (JCMethodInvocation)env.tree; |
duke@1 | 2458 | owntype = checkMethod(site, sym, env, app.args, |
duke@1 | 2459 | pt.getParameterTypes(), pt.getTypeArguments(), |
duke@1 | 2460 | env.info.varArgs); |
duke@1 | 2461 | break; |
duke@1 | 2462 | } |
duke@1 | 2463 | case PCK: case ERR: |
duke@1 | 2464 | owntype = sym.type; |
duke@1 | 2465 | break; |
duke@1 | 2466 | default: |
duke@1 | 2467 | throw new AssertionError("unexpected kind: " + sym.kind + |
duke@1 | 2468 | " in tree " + tree); |
duke@1 | 2469 | } |
duke@1 | 2470 | |
duke@1 | 2471 | // Test (1): emit a `deprecation' warning if symbol is deprecated. |
duke@1 | 2472 | // (for constructors, the error was given when the constructor was |
duke@1 | 2473 | // resolved) |
duke@1 | 2474 | if (sym.name != names.init && |
duke@1 | 2475 | (sym.flags() & DEPRECATED) != 0 && |
duke@1 | 2476 | (env.info.scope.owner.flags() & DEPRECATED) == 0 && |
duke@1 | 2477 | sym.outermostClass() != env.info.scope.owner.outermostClass()) |
duke@1 | 2478 | chk.warnDeprecated(tree.pos(), sym); |
duke@1 | 2479 | |
jjg@377 | 2480 | if ((sym.flags() & PROPRIETARY) != 0) { |
jjg@377 | 2481 | if (enableSunApiLintControl) |
jjg@377 | 2482 | chk.warnSunApi(tree.pos(), "sun.proprietary", sym); |
jjg@377 | 2483 | else |
jjg@377 | 2484 | log.strictWarning(tree.pos(), "sun.proprietary", sym); |
jjg@377 | 2485 | } |
duke@1 | 2486 | |
duke@1 | 2487 | // Test (3): if symbol is a variable, check that its type and |
duke@1 | 2488 | // kind are compatible with the prototype and protokind. |
duke@1 | 2489 | return check(tree, owntype, sym.kind, pkind, pt); |
duke@1 | 2490 | } |
duke@1 | 2491 | |
duke@1 | 2492 | /** Check that variable is initialized and evaluate the variable's |
duke@1 | 2493 | * initializer, if not yet done. Also check that variable is not |
duke@1 | 2494 | * referenced before it is defined. |
duke@1 | 2495 | * @param tree The tree making up the variable reference. |
duke@1 | 2496 | * @param env The current environment. |
duke@1 | 2497 | * @param v The variable's symbol. |
duke@1 | 2498 | */ |
duke@1 | 2499 | private void checkInit(JCTree tree, |
duke@1 | 2500 | Env<AttrContext> env, |
duke@1 | 2501 | VarSymbol v, |
duke@1 | 2502 | boolean onlyWarning) { |
duke@1 | 2503 | // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " + |
duke@1 | 2504 | // tree.pos + " " + v.pos + " " + |
duke@1 | 2505 | // Resolve.isStatic(env));//DEBUG |
duke@1 | 2506 | |
duke@1 | 2507 | // A forward reference is diagnosed if the declaration position |
duke@1 | 2508 | // of the variable is greater than the current tree position |
duke@1 | 2509 | // and the tree and variable definition occur in the same class |
duke@1 | 2510 | // definition. Note that writes don't count as references. |
duke@1 | 2511 | // This check applies only to class and instance |
duke@1 | 2512 | // variables. Local variables follow different scope rules, |
duke@1 | 2513 | // and are subject to definite assignment checking. |
mcimadamore@94 | 2514 | if ((env.info.enclVar == v || v.pos > tree.pos) && |
duke@1 | 2515 | v.owner.kind == TYP && |
duke@1 | 2516 | canOwnInitializer(env.info.scope.owner) && |
duke@1 | 2517 | v.owner == env.info.scope.owner.enclClass() && |
duke@1 | 2518 | ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && |
duke@1 | 2519 | (env.tree.getTag() != JCTree.ASSIGN || |
duke@1 | 2520 | TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { |
mcimadamore@94 | 2521 | String suffix = (env.info.enclVar == v) ? |
mcimadamore@94 | 2522 | "self.ref" : "forward.ref"; |
mcimadamore@18 | 2523 | if (!onlyWarning || isStaticEnumField(v)) { |
mcimadamore@94 | 2524 | log.error(tree.pos(), "illegal." + suffix); |
duke@1 | 2525 | } else if (useBeforeDeclarationWarning) { |
mcimadamore@94 | 2526 | log.warning(tree.pos(), suffix, v); |
duke@1 | 2527 | } |
duke@1 | 2528 | } |
duke@1 | 2529 | |
duke@1 | 2530 | v.getConstValue(); // ensure initializer is evaluated |
duke@1 | 2531 | |
duke@1 | 2532 | checkEnumInitializer(tree, env, v); |
duke@1 | 2533 | } |
duke@1 | 2534 | |
duke@1 | 2535 | /** |
duke@1 | 2536 | * Check for illegal references to static members of enum. In |
duke@1 | 2537 | * an enum type, constructors and initializers may not |
duke@1 | 2538 | * reference its static members unless they are constant. |
duke@1 | 2539 | * |
duke@1 | 2540 | * @param tree The tree making up the variable reference. |
duke@1 | 2541 | * @param env The current environment. |
duke@1 | 2542 | * @param v The variable's symbol. |
duke@1 | 2543 | * @see JLS 3rd Ed. (8.9 Enums) |
duke@1 | 2544 | */ |
duke@1 | 2545 | private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { |
duke@1 | 2546 | // JLS 3rd Ed.: |
duke@1 | 2547 | // |
duke@1 | 2548 | // "It is a compile-time error to reference a static field |
duke@1 | 2549 | // of an enum type that is not a compile-time constant |
duke@1 | 2550 | // (15.28) from constructors, instance initializer blocks, |
duke@1 | 2551 | // or instance variable initializer expressions of that |
duke@1 | 2552 | // type. It is a compile-time error for the constructors, |
duke@1 | 2553 | // instance initializer blocks, or instance variable |
duke@1 | 2554 | // initializer expressions of an enum constant e to refer |
duke@1 | 2555 | // to itself or to an enum constant of the same type that |
duke@1 | 2556 | // is declared to the right of e." |
mcimadamore@18 | 2557 | if (isStaticEnumField(v)) { |
duke@1 | 2558 | ClassSymbol enclClass = env.info.scope.owner.enclClass(); |
duke@1 | 2559 | |
duke@1 | 2560 | if (enclClass == null || enclClass.owner == null) |
duke@1 | 2561 | return; |
duke@1 | 2562 | |
duke@1 | 2563 | // See if the enclosing class is the enum (or a |
duke@1 | 2564 | // subclass thereof) declaring v. If not, this |
duke@1 | 2565 | // reference is OK. |
duke@1 | 2566 | if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) |
duke@1 | 2567 | return; |
duke@1 | 2568 | |
duke@1 | 2569 | // If the reference isn't from an initializer, then |
duke@1 | 2570 | // the reference is OK. |
duke@1 | 2571 | if (!Resolve.isInitializer(env)) |
duke@1 | 2572 | return; |
duke@1 | 2573 | |
duke@1 | 2574 | log.error(tree.pos(), "illegal.enum.static.ref"); |
duke@1 | 2575 | } |
duke@1 | 2576 | } |
duke@1 | 2577 | |
mcimadamore@18 | 2578 | /** Is the given symbol a static, non-constant field of an Enum? |
mcimadamore@18 | 2579 | * Note: enum literals should not be regarded as such |
mcimadamore@18 | 2580 | */ |
mcimadamore@18 | 2581 | private boolean isStaticEnumField(VarSymbol v) { |
mcimadamore@18 | 2582 | return Flags.isEnum(v.owner) && |
mcimadamore@18 | 2583 | Flags.isStatic(v) && |
mcimadamore@18 | 2584 | !Flags.isConstant(v) && |
mcimadamore@18 | 2585 | v.name != names._class; |
duke@1 | 2586 | } |
duke@1 | 2587 | |
duke@1 | 2588 | /** Can the given symbol be the owner of code which forms part |
duke@1 | 2589 | * if class initialization? This is the case if the symbol is |
duke@1 | 2590 | * a type or field, or if the symbol is the synthetic method. |
duke@1 | 2591 | * owning a block. |
duke@1 | 2592 | */ |
duke@1 | 2593 | private boolean canOwnInitializer(Symbol sym) { |
duke@1 | 2594 | return |
duke@1 | 2595 | (sym.kind & (VAR | TYP)) != 0 || |
duke@1 | 2596 | (sym.kind == MTH && (sym.flags() & BLOCK) != 0); |
duke@1 | 2597 | } |
duke@1 | 2598 | |
duke@1 | 2599 | Warner noteWarner = new Warner(); |
duke@1 | 2600 | |
duke@1 | 2601 | /** |
duke@1 | 2602 | * Check that method arguments conform to its instantation. |
duke@1 | 2603 | **/ |
duke@1 | 2604 | public Type checkMethod(Type site, |
duke@1 | 2605 | Symbol sym, |
duke@1 | 2606 | Env<AttrContext> env, |
duke@1 | 2607 | final List<JCExpression> argtrees, |
duke@1 | 2608 | List<Type> argtypes, |
duke@1 | 2609 | List<Type> typeargtypes, |
duke@1 | 2610 | boolean useVarargs) { |
duke@1 | 2611 | // Test (5): if symbol is an instance method of a raw type, issue |
duke@1 | 2612 | // an unchecked warning if its argument types change under erasure. |
duke@1 | 2613 | if (allowGenerics && |
duke@1 | 2614 | (sym.flags() & STATIC) == 0 && |
duke@1 | 2615 | (site.tag == CLASS || site.tag == TYPEVAR)) { |
duke@1 | 2616 | Type s = types.asOuterSuper(site, sym.owner); |
duke@1 | 2617 | if (s != null && s.isRaw() && |
duke@1 | 2618 | !types.isSameTypes(sym.type.getParameterTypes(), |
duke@1 | 2619 | sym.erasure(types).getParameterTypes())) { |
duke@1 | 2620 | chk.warnUnchecked(env.tree.pos(), |
duke@1 | 2621 | "unchecked.call.mbr.of.raw.type", |
duke@1 | 2622 | sym, s); |
duke@1 | 2623 | } |
duke@1 | 2624 | } |
duke@1 | 2625 | |
duke@1 | 2626 | // Compute the identifier's instantiated type. |
duke@1 | 2627 | // For methods, we need to compute the instance type by |
duke@1 | 2628 | // Resolve.instantiate from the symbol's type as well as |
duke@1 | 2629 | // any type arguments and value arguments. |
duke@1 | 2630 | noteWarner.warned = false; |
duke@1 | 2631 | Type owntype = rs.instantiate(env, |
duke@1 | 2632 | site, |
duke@1 | 2633 | sym, |
duke@1 | 2634 | argtypes, |
duke@1 | 2635 | typeargtypes, |
duke@1 | 2636 | true, |
duke@1 | 2637 | useVarargs, |
duke@1 | 2638 | noteWarner); |
duke@1 | 2639 | boolean warned = noteWarner.warned; |
duke@1 | 2640 | |
duke@1 | 2641 | // If this fails, something went wrong; we should not have |
duke@1 | 2642 | // found the identifier in the first place. |
duke@1 | 2643 | if (owntype == null) { |
duke@1 | 2644 | if (!pt.isErroneous()) |
duke@1 | 2645 | log.error(env.tree.pos(), |
duke@1 | 2646 | "internal.error.cant.instantiate", |
duke@1 | 2647 | sym, site, |
duke@1 | 2648 | Type.toString(pt.getParameterTypes())); |
jjg@110 | 2649 | owntype = types.createErrorType(site); |
duke@1 | 2650 | } else { |
duke@1 | 2651 | // System.out.println("call : " + env.tree); |
duke@1 | 2652 | // System.out.println("method : " + owntype); |
duke@1 | 2653 | // System.out.println("actuals: " + argtypes); |
duke@1 | 2654 | List<Type> formals = owntype.getParameterTypes(); |
duke@1 | 2655 | Type last = useVarargs ? formals.last() : null; |
duke@1 | 2656 | if (sym.name==names.init && |
duke@1 | 2657 | sym.owner == syms.enumSym) |
duke@1 | 2658 | formals = formals.tail.tail; |
duke@1 | 2659 | List<JCExpression> args = argtrees; |
duke@1 | 2660 | while (formals.head != last) { |
duke@1 | 2661 | JCTree arg = args.head; |
duke@1 | 2662 | Warner warn = chk.convertWarner(arg.pos(), arg.type, formals.head); |
duke@1 | 2663 | assertConvertible(arg, arg.type, formals.head, warn); |
duke@1 | 2664 | warned |= warn.warned; |
duke@1 | 2665 | args = args.tail; |
duke@1 | 2666 | formals = formals.tail; |
duke@1 | 2667 | } |
duke@1 | 2668 | if (useVarargs) { |
duke@1 | 2669 | Type varArg = types.elemtype(last); |
duke@1 | 2670 | while (args.tail != null) { |
duke@1 | 2671 | JCTree arg = args.head; |
duke@1 | 2672 | Warner warn = chk.convertWarner(arg.pos(), arg.type, varArg); |
duke@1 | 2673 | assertConvertible(arg, arg.type, varArg, warn); |
duke@1 | 2674 | warned |= warn.warned; |
duke@1 | 2675 | args = args.tail; |
duke@1 | 2676 | } |
duke@1 | 2677 | } else if ((sym.flags() & VARARGS) != 0 && allowVarargs) { |
duke@1 | 2678 | // non-varargs call to varargs method |
duke@1 | 2679 | Type varParam = owntype.getParameterTypes().last(); |
duke@1 | 2680 | Type lastArg = argtypes.last(); |
duke@1 | 2681 | if (types.isSubtypeUnchecked(lastArg, types.elemtype(varParam)) && |
duke@1 | 2682 | !types.isSameType(types.erasure(varParam), types.erasure(lastArg))) |
duke@1 | 2683 | log.warning(argtrees.last().pos(), "inexact.non-varargs.call", |
duke@1 | 2684 | types.elemtype(varParam), |
duke@1 | 2685 | varParam); |
duke@1 | 2686 | } |
duke@1 | 2687 | |
duke@1 | 2688 | if (warned && sym.type.tag == FORALL) { |
duke@1 | 2689 | chk.warnUnchecked(env.tree.pos(), |
duke@1 | 2690 | "unchecked.meth.invocation.applied", |
mcimadamore@161 | 2691 | kindName(sym), |
mcimadamore@161 | 2692 | sym.name, |
mcimadamore@161 | 2693 | rs.methodArguments(sym.type.getParameterTypes()), |
mcimadamore@161 | 2694 | rs.methodArguments(argtypes), |
mcimadamore@161 | 2695 | kindName(sym.location()), |
mcimadamore@161 | 2696 | sym.location()); |
duke@1 | 2697 | owntype = new MethodType(owntype.getParameterTypes(), |
duke@1 | 2698 | types.erasure(owntype.getReturnType()), |
duke@1 | 2699 | owntype.getThrownTypes(), |
duke@1 | 2700 | syms.methodClass); |
duke@1 | 2701 | } |
duke@1 | 2702 | if (useVarargs) { |
duke@1 | 2703 | JCTree tree = env.tree; |
mcimadamore@580 | 2704 | Type argtype = owntype.getParameterTypes().last(); |
mcimadamore@547 | 2705 | if (owntype.getReturnType().tag != FORALL || warned) { |
mcimadamore@580 | 2706 | chk.checkVararg(env.tree.pos(), owntype.getParameterTypes(), sym, env); |
mcimadamore@547 | 2707 | } |
mcimadamore@580 | 2708 | Type elemtype = types.elemtype(argtype); |
duke@1 | 2709 | switch (tree.getTag()) { |
duke@1 | 2710 | case JCTree.APPLY: |
duke@1 | 2711 | ((JCMethodInvocation) tree).varargsElement = elemtype; |
duke@1 | 2712 | break; |
duke@1 | 2713 | case JCTree.NEWCLASS: |
duke@1 | 2714 | ((JCNewClass) tree).varargsElement = elemtype; |
duke@1 | 2715 | break; |
duke@1 | 2716 | default: |
duke@1 | 2717 | throw new AssertionError(""+tree); |
duke@1 | 2718 | } |
duke@1 | 2719 | } |
duke@1 | 2720 | } |
duke@1 | 2721 | return owntype; |
duke@1 | 2722 | } |
duke@1 | 2723 | |
duke@1 | 2724 | private void assertConvertible(JCTree tree, Type actual, Type formal, Warner warn) { |
duke@1 | 2725 | if (types.isConvertible(actual, formal, warn)) |
duke@1 | 2726 | return; |
duke@1 | 2727 | |
duke@1 | 2728 | if (formal.isCompound() |
duke@1 | 2729 | && types.isSubtype(actual, types.supertype(formal)) |
duke@1 | 2730 | && types.isSubtypeUnchecked(actual, types.interfaces(formal), warn)) |
duke@1 | 2731 | return; |
duke@1 | 2732 | |
duke@1 | 2733 | if (false) { |
duke@1 | 2734 | // TODO: make assertConvertible work |
mcimadamore@89 | 2735 | chk.typeError(tree.pos(), diags.fragment("incompatible.types"), actual, formal); |
duke@1 | 2736 | throw new AssertionError("Tree: " + tree |
duke@1 | 2737 | + " actual:" + actual |
duke@1 | 2738 | + " formal: " + formal); |
duke@1 | 2739 | } |
duke@1 | 2740 | } |
duke@1 | 2741 | |
duke@1 | 2742 | public void visitLiteral(JCLiteral tree) { |
duke@1 | 2743 | result = check( |
duke@1 | 2744 | tree, litType(tree.typetag).constType(tree.value), VAL, pkind, pt); |
duke@1 | 2745 | } |
duke@1 | 2746 | //where |
duke@1 | 2747 | /** Return the type of a literal with given type tag. |
duke@1 | 2748 | */ |
duke@1 | 2749 | Type litType(int tag) { |
duke@1 | 2750 | return (tag == TypeTags.CLASS) ? syms.stringType : syms.typeOfTag[tag]; |
duke@1 | 2751 | } |
duke@1 | 2752 | |
duke@1 | 2753 | public void visitTypeIdent(JCPrimitiveTypeTree tree) { |
duke@1 | 2754 | result = check(tree, syms.typeOfTag[tree.typetag], TYP, pkind, pt); |
duke@1 | 2755 | } |
duke@1 | 2756 | |
duke@1 | 2757 | public void visitTypeArray(JCArrayTypeTree tree) { |
duke@1 | 2758 | Type etype = attribType(tree.elemtype, env); |
duke@1 | 2759 | Type type = new ArrayType(etype, syms.arrayClass); |
duke@1 | 2760 | result = check(tree, type, TYP, pkind, pt); |
duke@1 | 2761 | } |
duke@1 | 2762 | |
duke@1 | 2763 | /** Visitor method for parameterized types. |
duke@1 | 2764 | * Bound checking is left until later, since types are attributed |
duke@1 | 2765 | * before supertype structure is completely known |
duke@1 | 2766 | */ |
duke@1 | 2767 | public void visitTypeApply(JCTypeApply tree) { |
jjg@110 | 2768 | Type owntype = types.createErrorType(tree.type); |
duke@1 | 2769 | |
duke@1 | 2770 | // Attribute functor part of application and make sure it's a class. |
duke@1 | 2771 | Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); |
duke@1 | 2772 | |
duke@1 | 2773 | // Attribute type parameters |
duke@1 | 2774 | List<Type> actuals = attribTypes(tree.arguments, env); |
duke@1 | 2775 | |
duke@1 | 2776 | if (clazztype.tag == CLASS) { |
duke@1 | 2777 | List<Type> formals = clazztype.tsym.type.getTypeArguments(); |
duke@1 | 2778 | |
mcimadamore@537 | 2779 | if (actuals.length() == formals.length() || actuals.length() == 0) { |
duke@1 | 2780 | List<Type> a = actuals; |
duke@1 | 2781 | List<Type> f = formals; |
duke@1 | 2782 | while (a.nonEmpty()) { |
duke@1 | 2783 | a.head = a.head.withTypeVar(f.head); |
duke@1 | 2784 | a = a.tail; |
duke@1 | 2785 | f = f.tail; |
duke@1 | 2786 | } |
duke@1 | 2787 | // Compute the proper generic outer |
duke@1 | 2788 | Type clazzOuter = clazztype.getEnclosingType(); |
duke@1 | 2789 | if (clazzOuter.tag == CLASS) { |
duke@1 | 2790 | Type site; |
jjg@308 | 2791 | JCExpression clazz = TreeInfo.typeIn(tree.clazz); |
jjg@308 | 2792 | if (clazz.getTag() == JCTree.IDENT) { |
duke@1 | 2793 | site = env.enclClass.sym.type; |
jjg@308 | 2794 | } else if (clazz.getTag() == JCTree.SELECT) { |
jjg@308 | 2795 | site = ((JCFieldAccess) clazz).selected.type; |
duke@1 | 2796 | } else throw new AssertionError(""+tree); |
duke@1 | 2797 | if (clazzOuter.tag == CLASS && site != clazzOuter) { |
duke@1 | 2798 | if (site.tag == CLASS) |
duke@1 | 2799 | site = types.asOuterSuper(site, clazzOuter.tsym); |
duke@1 | 2800 | if (site == null) |
duke@1 | 2801 | site = types.erasure(clazzOuter); |
duke@1 | 2802 | clazzOuter = site; |
duke@1 | 2803 | } |
duke@1 | 2804 | } |
mcimadamore@536 | 2805 | owntype = new ClassType(clazzOuter, actuals, clazztype.tsym); |
duke@1 | 2806 | } else { |
duke@1 | 2807 | if (formals.length() != 0) { |
duke@1 | 2808 | log.error(tree.pos(), "wrong.number.type.args", |
duke@1 | 2809 | Integer.toString(formals.length())); |
duke@1 | 2810 | } else { |
duke@1 | 2811 | log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); |
duke@1 | 2812 | } |
jjg@110 | 2813 | owntype = types.createErrorType(tree.type); |
duke@1 | 2814 | } |
duke@1 | 2815 | } |
duke@1 | 2816 | result = check(tree, owntype, TYP, pkind, pt); |
duke@1 | 2817 | } |
duke@1 | 2818 | |
mcimadamore@550 | 2819 | public void visitTypeDisjoint(JCTypeDisjoint tree) { |
mcimadamore@550 | 2820 | List<Type> componentTypes = attribTypes(tree.components, env); |
mcimadamore@550 | 2821 | tree.type = result = check(tree, types.lub(componentTypes), TYP, pkind, pt); |
mcimadamore@550 | 2822 | } |
mcimadamore@550 | 2823 | |
duke@1 | 2824 | public void visitTypeParameter(JCTypeParameter tree) { |
duke@1 | 2825 | TypeVar a = (TypeVar)tree.type; |
duke@1 | 2826 | Set<Type> boundSet = new HashSet<Type>(); |
duke@1 | 2827 | if (a.bound.isErroneous()) |
duke@1 | 2828 | return; |
duke@1 | 2829 | List<Type> bs = types.getBounds(a); |
duke@1 | 2830 | if (tree.bounds.nonEmpty()) { |
duke@1 | 2831 | // accept class or interface or typevar as first bound. |
duke@1 | 2832 | Type b = checkBase(bs.head, tree.bounds.head, env, false, false, false); |
duke@1 | 2833 | boundSet.add(types.erasure(b)); |
mcimadamore@159 | 2834 | if (b.isErroneous()) { |
mcimadamore@159 | 2835 | a.bound = b; |
mcimadamore@159 | 2836 | } |
mcimadamore@159 | 2837 | else if (b.tag == TYPEVAR) { |
duke@1 | 2838 | // if first bound was a typevar, do not accept further bounds. |
duke@1 | 2839 | if (tree.bounds.tail.nonEmpty()) { |
duke@1 | 2840 | log.error(tree.bounds.tail.head.pos(), |
duke@1 | 2841 | "type.var.may.not.be.followed.by.other.bounds"); |
jjg@504 | 2842 | log.unrecoverableError = true; |
duke@1 | 2843 | tree.bounds = List.of(tree.bounds.head); |
mcimadamore@7 | 2844 | a.bound = bs.head; |
duke@1 | 2845 | } |
duke@1 | 2846 | } else { |
duke@1 | 2847 | // if first bound was a class or interface, accept only interfaces |
duke@1 | 2848 | // as further bounds. |
duke@1 | 2849 | for (JCExpression bound : tree.bounds.tail) { |
duke@1 | 2850 | bs = bs.tail; |
duke@1 | 2851 | Type i = checkBase(bs.head, bound, env, false, true, false); |
mcimadamore@159 | 2852 | if (i.isErroneous()) |
mcimadamore@159 | 2853 | a.bound = i; |
mcimadamore@159 | 2854 | else if (i.tag == CLASS) |
duke@1 | 2855 | chk.checkNotRepeated(bound.pos(), types.erasure(i), boundSet); |
duke@1 | 2856 | } |
duke@1 | 2857 | } |
duke@1 | 2858 | } |
duke@1 | 2859 | bs = types.getBounds(a); |
duke@1 | 2860 | |
duke@1 | 2861 | // in case of multiple bounds ... |
duke@1 | 2862 | if (bs.length() > 1) { |
duke@1 | 2863 | // ... the variable's bound is a class type flagged COMPOUND |
duke@1 | 2864 | // (see comment for TypeVar.bound). |
duke@1 | 2865 | // In this case, generate a class tree that represents the |
duke@1 | 2866 | // bound class, ... |
duke@1 | 2867 | JCTree extending; |
duke@1 | 2868 | List<JCExpression> implementing; |
duke@1 | 2869 | if ((bs.head.tsym.flags() & INTERFACE) == 0) { |
duke@1 | 2870 | extending = tree.bounds.head; |
duke@1 | 2871 | implementing = tree.bounds.tail; |
duke@1 | 2872 | } else { |
duke@1 | 2873 | extending = null; |
duke@1 | 2874 | implementing = tree.bounds; |
duke@1 | 2875 | } |
duke@1 | 2876 | JCClassDecl cd = make.at(tree.pos).ClassDef( |
duke@1 | 2877 | make.Modifiers(PUBLIC | ABSTRACT), |
duke@1 | 2878 | tree.name, List.<JCTypeParameter>nil(), |
duke@1 | 2879 | extending, implementing, List.<JCTree>nil()); |
duke@1 | 2880 | |
duke@1 | 2881 | ClassSymbol c = (ClassSymbol)a.getUpperBound().tsym; |
duke@1 | 2882 | assert (c.flags() & COMPOUND) != 0; |
duke@1 | 2883 | cd.sym = c; |
duke@1 | 2884 | c.sourcefile = env.toplevel.sourcefile; |
duke@1 | 2885 | |
duke@1 | 2886 | // ... and attribute the bound class |
duke@1 | 2887 | c.flags_field |= UNATTRIBUTED; |
duke@1 | 2888 | Env<AttrContext> cenv = enter.classEnv(cd, env); |
duke@1 | 2889 | enter.typeEnvs.put(c, cenv); |
duke@1 | 2890 | } |
duke@1 | 2891 | } |
duke@1 | 2892 | |
duke@1 | 2893 | |
duke@1 | 2894 | public void visitWildcard(JCWildcard tree) { |
duke@1 | 2895 | //- System.err.println("visitWildcard("+tree+");");//DEBUG |
duke@1 | 2896 | Type type = (tree.kind.kind == BoundKind.UNBOUND) |
duke@1 | 2897 | ? syms.objectType |
duke@1 | 2898 | : attribType(tree.inner, env); |
duke@1 | 2899 | result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), |
duke@1 | 2900 | tree.kind.kind, |
duke@1 | 2901 | syms.boundClass), |
duke@1 | 2902 | TYP, pkind, pt); |
duke@1 | 2903 | } |
duke@1 | 2904 | |
duke@1 | 2905 | public void visitAnnotation(JCAnnotation tree) { |
duke@1 | 2906 | log.error(tree.pos(), "annotation.not.valid.for.type", pt); |
duke@1 | 2907 | result = tree.type = syms.errType; |
duke@1 | 2908 | } |
duke@1 | 2909 | |
jjg@308 | 2910 | public void visitAnnotatedType(JCAnnotatedType tree) { |
jjg@308 | 2911 | result = tree.type = attribType(tree.getUnderlyingType(), env); |
jjg@308 | 2912 | } |
jjg@308 | 2913 | |
duke@1 | 2914 | public void visitErroneous(JCErroneous tree) { |
duke@1 | 2915 | if (tree.errs != null) |
duke@1 | 2916 | for (JCTree err : tree.errs) |
duke@1 | 2917 | attribTree(err, env, ERR, pt); |
duke@1 | 2918 | result = tree.type = syms.errType; |
duke@1 | 2919 | } |
duke@1 | 2920 | |
duke@1 | 2921 | /** Default visitor method for all other trees. |
duke@1 | 2922 | */ |
duke@1 | 2923 | public void visitTree(JCTree tree) { |
duke@1 | 2924 | throw new AssertionError(); |
duke@1 | 2925 | } |
duke@1 | 2926 | |
duke@1 | 2927 | /** Main method: attribute class definition associated with given class symbol. |
duke@1 | 2928 | * reporting completion failures at the given position. |
duke@1 | 2929 | * @param pos The source position at which completion errors are to be |
duke@1 | 2930 | * reported. |
duke@1 | 2931 | * @param c The class symbol whose definition will be attributed. |
duke@1 | 2932 | */ |
duke@1 | 2933 | public void attribClass(DiagnosticPosition pos, ClassSymbol c) { |
duke@1 | 2934 | try { |
duke@1 | 2935 | annotate.flush(); |
duke@1 | 2936 | attribClass(c); |
duke@1 | 2937 | } catch (CompletionFailure ex) { |
duke@1 | 2938 | chk.completionError(pos, ex); |
duke@1 | 2939 | } |
duke@1 | 2940 | } |
duke@1 | 2941 | |
duke@1 | 2942 | /** Attribute class definition associated with given class symbol. |
duke@1 | 2943 | * @param c The class symbol whose definition will be attributed. |
duke@1 | 2944 | */ |
duke@1 | 2945 | void attribClass(ClassSymbol c) throws CompletionFailure { |
duke@1 | 2946 | if (c.type.tag == ERROR) return; |
duke@1 | 2947 | |
duke@1 | 2948 | // Check for cycles in the inheritance graph, which can arise from |
duke@1 | 2949 | // ill-formed class files. |
duke@1 | 2950 | chk.checkNonCyclic(null, c.type); |
duke@1 | 2951 | |
duke@1 | 2952 | Type st = types.supertype(c.type); |
duke@1 | 2953 | if ((c.flags_field & Flags.COMPOUND) == 0) { |
duke@1 | 2954 | // First, attribute superclass. |
duke@1 | 2955 | if (st.tag == CLASS) |
duke@1 | 2956 | attribClass((ClassSymbol)st.tsym); |
duke@1 | 2957 | |
duke@1 | 2958 | // Next attribute owner, if it is a class. |
duke@1 | 2959 | if (c.owner.kind == TYP && c.owner.type.tag == CLASS) |
duke@1 | 2960 | attribClass((ClassSymbol)c.owner); |
duke@1 | 2961 | } |
duke@1 | 2962 | |
duke@1 | 2963 | // The previous operations might have attributed the current class |
duke@1 | 2964 | // if there was a cycle. So we test first whether the class is still |
duke@1 | 2965 | // UNATTRIBUTED. |
duke@1 | 2966 | if ((c.flags_field & UNATTRIBUTED) != 0) { |
duke@1 | 2967 | c.flags_field &= ~UNATTRIBUTED; |
duke@1 | 2968 | |
duke@1 | 2969 | // Get environment current at the point of class definition. |
duke@1 | 2970 | Env<AttrContext> env = enter.typeEnvs.get(c); |
duke@1 | 2971 | |
duke@1 | 2972 | // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized, |
duke@1 | 2973 | // because the annotations were not available at the time the env was created. Therefore, |
duke@1 | 2974 | // we look up the environment chain for the first enclosing environment for which the |
duke@1 | 2975 | // lint value is set. Typically, this is the parent env, but might be further if there |
duke@1 | 2976 | // are any envs created as a result of TypeParameter nodes. |
duke@1 | 2977 | Env<AttrContext> lintEnv = env; |
duke@1 | 2978 | while (lintEnv.info.lint == null) |
duke@1 | 2979 | lintEnv = lintEnv.next; |
duke@1 | 2980 | |
duke@1 | 2981 | // Having found the enclosing lint value, we can initialize the lint value for this class |
duke@1 | 2982 | env.info.lint = lintEnv.info.lint.augment(c.attributes_field, c.flags()); |
duke@1 | 2983 | |
duke@1 | 2984 | Lint prevLint = chk.setLint(env.info.lint); |
duke@1 | 2985 | JavaFileObject prev = log.useSource(c.sourcefile); |
duke@1 | 2986 | |
duke@1 | 2987 | try { |
duke@1 | 2988 | // java.lang.Enum may not be subclassed by a non-enum |
duke@1 | 2989 | if (st.tsym == syms.enumSym && |
duke@1 | 2990 | ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) |
duke@1 | 2991 | log.error(env.tree.pos(), "enum.no.subclassing"); |
duke@1 | 2992 | |
duke@1 | 2993 | // Enums may not be extended by source-level classes |
duke@1 | 2994 | if (st.tsym != null && |
duke@1 | 2995 | ((st.tsym.flags_field & Flags.ENUM) != 0) && |
mcimadamore@82 | 2996 | ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0) && |
duke@1 | 2997 | !target.compilerBootstrap(c)) { |
duke@1 | 2998 | log.error(env.tree.pos(), "enum.types.not.extensible"); |
duke@1 | 2999 | } |
duke@1 | 3000 | attribClassBody(env, c); |
duke@1 | 3001 | |
duke@1 | 3002 | chk.checkDeprecatedAnnotation(env.tree.pos(), c); |
duke@1 | 3003 | } finally { |
duke@1 | 3004 | log.useSource(prev); |
duke@1 | 3005 | chk.setLint(prevLint); |
duke@1 | 3006 | } |
duke@1 | 3007 | |
duke@1 | 3008 | } |
duke@1 | 3009 | } |
duke@1 | 3010 | |
duke@1 | 3011 | public void visitImport(JCImport tree) { |
duke@1 | 3012 | // nothing to do |
duke@1 | 3013 | } |
duke@1 | 3014 | |
duke@1 | 3015 | /** Finish the attribution of a class. */ |
duke@1 | 3016 | private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { |
duke@1 | 3017 | JCClassDecl tree = (JCClassDecl)env.tree; |
duke@1 | 3018 | assert c == tree.sym; |
duke@1 | 3019 | |
duke@1 | 3020 | // Validate annotations |
duke@1 | 3021 | chk.validateAnnotations(tree.mods.annotations, c); |
duke@1 | 3022 | |
duke@1 | 3023 | // Validate type parameters, supertype and interfaces. |
mcimadamore@42 | 3024 | attribBounds(tree.typarams); |
mcimadamore@537 | 3025 | if (!c.isAnonymous()) { |
mcimadamore@537 | 3026 | //already checked if anonymous |
mcimadamore@537 | 3027 | chk.validate(tree.typarams, env); |
mcimadamore@537 | 3028 | chk.validate(tree.extending, env); |
mcimadamore@537 | 3029 | chk.validate(tree.implementing, env); |
mcimadamore@537 | 3030 | } |
duke@1 | 3031 | |
duke@1 | 3032 | // If this is a non-abstract class, check that it has no abstract |
duke@1 | 3033 | // methods or unimplemented methods of an implemented interface. |
duke@1 | 3034 | if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { |
duke@1 | 3035 | if (!relax) |
duke@1 | 3036 | chk.checkAllDefined(tree.pos(), c); |
duke@1 | 3037 | } |
duke@1 | 3038 | |
duke@1 | 3039 | if ((c.flags() & ANNOTATION) != 0) { |
duke@1 | 3040 | if (tree.implementing.nonEmpty()) |
duke@1 | 3041 | log.error(tree.implementing.head.pos(), |
duke@1 | 3042 | "cant.extend.intf.annotation"); |
duke@1 | 3043 | if (tree.typarams.nonEmpty()) |
duke@1 | 3044 | log.error(tree.typarams.head.pos(), |
duke@1 | 3045 | "intf.annotation.cant.have.type.params"); |
duke@1 | 3046 | } else { |
duke@1 | 3047 | // Check that all extended classes and interfaces |
duke@1 | 3048 | // are compatible (i.e. no two define methods with same arguments |
duke@1 | 3049 | // yet different return types). (JLS 8.4.6.3) |
duke@1 | 3050 | chk.checkCompatibleSupertypes(tree.pos(), c.type); |
duke@1 | 3051 | } |
duke@1 | 3052 | |
duke@1 | 3053 | // Check that class does not import the same parameterized interface |
duke@1 | 3054 | // with two different argument lists. |
duke@1 | 3055 | chk.checkClassBounds(tree.pos(), c.type); |
duke@1 | 3056 | |
duke@1 | 3057 | tree.type = c.type; |
duke@1 | 3058 | |
duke@1 | 3059 | boolean assertsEnabled = false; |
duke@1 | 3060 | assert assertsEnabled = true; |
duke@1 | 3061 | if (assertsEnabled) { |
duke@1 | 3062 | for (List<JCTypeParameter> l = tree.typarams; |
duke@1 | 3063 | l.nonEmpty(); l = l.tail) |
duke@1 | 3064 | assert env.info.scope.lookup(l.head.name).scope != null; |
duke@1 | 3065 | } |
duke@1 | 3066 | |
duke@1 | 3067 | // Check that a generic class doesn't extend Throwable |
duke@1 | 3068 | if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) |
duke@1 | 3069 | log.error(tree.extending.pos(), "generic.throwable"); |
duke@1 | 3070 | |
duke@1 | 3071 | // Check that all methods which implement some |
duke@1 | 3072 | // method conform to the method they implement. |
duke@1 | 3073 | chk.checkImplementations(tree); |
duke@1 | 3074 | |
duke@1 | 3075 | for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { |
duke@1 | 3076 | // Attribute declaration |
duke@1 | 3077 | attribStat(l.head, env); |
duke@1 | 3078 | // Check that declarations in inner classes are not static (JLS 8.1.2) |
duke@1 | 3079 | // Make an exception for static constants. |
duke@1 | 3080 | if (c.owner.kind != PCK && |
duke@1 | 3081 | ((c.flags() & STATIC) == 0 || c.name == names.empty) && |
duke@1 | 3082 | (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { |
duke@1 | 3083 | Symbol sym = null; |
duke@1 | 3084 | if (l.head.getTag() == JCTree.VARDEF) sym = ((JCVariableDecl) l.head).sym; |
duke@1 | 3085 | if (sym == null || |
duke@1 | 3086 | sym.kind != VAR || |
duke@1 | 3087 | ((VarSymbol) sym).getConstValue() == null) |
duke@1 | 3088 | log.error(l.head.pos(), "icls.cant.have.static.decl"); |
duke@1 | 3089 | } |
duke@1 | 3090 | } |
duke@1 | 3091 | |
duke@1 | 3092 | // Check for cycles among non-initial constructors. |
duke@1 | 3093 | chk.checkCyclicConstructors(tree); |
duke@1 | 3094 | |
duke@1 | 3095 | // Check for cycles among annotation elements. |
duke@1 | 3096 | chk.checkNonCyclicElements(tree); |
duke@1 | 3097 | |
duke@1 | 3098 | // Check for proper use of serialVersionUID |
duke@1 | 3099 | if (env.info.lint.isEnabled(Lint.LintCategory.SERIAL) && |
duke@1 | 3100 | isSerializable(c) && |
duke@1 | 3101 | (c.flags() & Flags.ENUM) == 0 && |
duke@1 | 3102 | (c.flags() & ABSTRACT) == 0) { |
duke@1 | 3103 | checkSerialVersionUID(tree, c); |
duke@1 | 3104 | } |
jjg@308 | 3105 | |
jjg@308 | 3106 | // Check type annotations applicability rules |
jjg@308 | 3107 | validateTypeAnnotations(tree); |
duke@1 | 3108 | } |
duke@1 | 3109 | // where |
duke@1 | 3110 | /** check if a class is a subtype of Serializable, if that is available. */ |
duke@1 | 3111 | private boolean isSerializable(ClassSymbol c) { |
duke@1 | 3112 | try { |
duke@1 | 3113 | syms.serializableType.complete(); |
duke@1 | 3114 | } |
duke@1 | 3115 | catch (CompletionFailure e) { |
duke@1 | 3116 | return false; |
duke@1 | 3117 | } |
duke@1 | 3118 | return types.isSubtype(c.type, syms.serializableType); |
duke@1 | 3119 | } |
duke@1 | 3120 | |
duke@1 | 3121 | /** Check that an appropriate serialVersionUID member is defined. */ |
duke@1 | 3122 | private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { |
duke@1 | 3123 | |
duke@1 | 3124 | // check for presence of serialVersionUID |
duke@1 | 3125 | Scope.Entry e = c.members().lookup(names.serialVersionUID); |
duke@1 | 3126 | while (e.scope != null && e.sym.kind != VAR) e = e.next(); |
duke@1 | 3127 | if (e.scope == null) { |
jjg@612 | 3128 | log.warning(Lint.LintCategory.SERIAL, |
jjg@612 | 3129 | tree.pos(), "missing.SVUID", c); |
duke@1 | 3130 | return; |
duke@1 | 3131 | } |
duke@1 | 3132 | |
duke@1 | 3133 | // check that it is static final |
duke@1 | 3134 | VarSymbol svuid = (VarSymbol)e.sym; |
duke@1 | 3135 | if ((svuid.flags() & (STATIC | FINAL)) != |
duke@1 | 3136 | (STATIC | FINAL)) |
jjg@612 | 3137 | log.warning(Lint.LintCategory.SERIAL, |
jjg@612 | 3138 | TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); |
duke@1 | 3139 | |
duke@1 | 3140 | // check that it is long |
duke@1 | 3141 | else if (svuid.type.tag != TypeTags.LONG) |
jjg@612 | 3142 | log.warning(Lint.LintCategory.SERIAL, |
jjg@612 | 3143 | TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); |
duke@1 | 3144 | |
duke@1 | 3145 | // check constant |
duke@1 | 3146 | else if (svuid.getConstValue() == null) |
jjg@612 | 3147 | log.warning(Lint.LintCategory.SERIAL, |
jjg@612 | 3148 | TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); |
duke@1 | 3149 | } |
duke@1 | 3150 | |
duke@1 | 3151 | private Type capture(Type type) { |
duke@1 | 3152 | return types.capture(type); |
duke@1 | 3153 | } |
jjg@308 | 3154 | |
jjg@308 | 3155 | private void validateTypeAnnotations(JCTree tree) { |
jjg@308 | 3156 | tree.accept(typeAnnotationsValidator); |
jjg@308 | 3157 | } |
jjg@308 | 3158 | //where |
jjg@308 | 3159 | private final JCTree.Visitor typeAnnotationsValidator = |
jjg@308 | 3160 | new TreeScanner() { |
jjg@308 | 3161 | public void visitAnnotation(JCAnnotation tree) { |
jjg@308 | 3162 | if (tree instanceof JCTypeAnnotation) { |
jjg@308 | 3163 | chk.validateTypeAnnotation((JCTypeAnnotation)tree, false); |
jjg@308 | 3164 | } |
jjg@308 | 3165 | super.visitAnnotation(tree); |
jjg@308 | 3166 | } |
jjg@308 | 3167 | public void visitTypeParameter(JCTypeParameter tree) { |
jjg@308 | 3168 | chk.validateTypeAnnotations(tree.annotations, true); |
jjg@308 | 3169 | // don't call super. skip type annotations |
jjg@308 | 3170 | scan(tree.bounds); |
jjg@308 | 3171 | } |
jjg@308 | 3172 | public void visitMethodDef(JCMethodDecl tree) { |
jjg@308 | 3173 | // need to check static methods |
jjg@308 | 3174 | if ((tree.sym.flags() & Flags.STATIC) != 0) { |
jjg@308 | 3175 | for (JCTypeAnnotation a : tree.receiverAnnotations) { |
jjg@308 | 3176 | if (chk.isTypeAnnotation(a, false)) |
jjg@308 | 3177 | log.error(a.pos(), "annotation.type.not.applicable"); |
jjg@308 | 3178 | } |
jjg@308 | 3179 | } |
jjg@308 | 3180 | super.visitMethodDef(tree); |
jjg@308 | 3181 | } |
jjg@308 | 3182 | }; |
duke@1 | 3183 | } |