Fri, 24 Oct 2008 12:46:34 +0100
6758789: Some method resolution diagnostic should be improved
Summary: Recent work on diagnostics left out some resolution corner cases
Reviewed-by: jjg
duke@1 | 1 | /* |
xdono@54 | 2 | * Copyright 1999-2008 Sun Microsystems, Inc. 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 |
duke@1 | 7 | * published by the Free Software Foundation. Sun designates this |
duke@1 | 8 | * particular file as subject to the "Classpath" exception as provided |
duke@1 | 9 | * by Sun 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 | * |
duke@1 | 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@1 | 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@1 | 23 | * have any questions. |
duke@1 | 24 | */ |
duke@1 | 25 | |
duke@1 | 26 | package com.sun.tools.javac.comp; |
duke@1 | 27 | |
duke@1 | 28 | import com.sun.tools.javac.util.*; |
duke@1 | 29 | import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; |
duke@1 | 30 | import com.sun.tools.javac.code.*; |
duke@1 | 31 | import com.sun.tools.javac.jvm.*; |
duke@1 | 32 | import com.sun.tools.javac.tree.*; |
mcimadamore@161 | 33 | import com.sun.tools.javac.api.Formattable.LocalizedString; |
mcimadamore@160 | 34 | import static com.sun.tools.javac.comp.Resolve.MethodResolutionPhase.*; |
duke@1 | 35 | |
duke@1 | 36 | import com.sun.tools.javac.code.Type.*; |
duke@1 | 37 | import com.sun.tools.javac.code.Symbol.*; |
duke@1 | 38 | import com.sun.tools.javac.tree.JCTree.*; |
duke@1 | 39 | |
duke@1 | 40 | import static com.sun.tools.javac.code.Flags.*; |
duke@1 | 41 | import static com.sun.tools.javac.code.Kinds.*; |
duke@1 | 42 | import static com.sun.tools.javac.code.TypeTags.*; |
duke@1 | 43 | import javax.lang.model.element.ElementVisitor; |
duke@1 | 44 | |
mcimadamore@160 | 45 | import java.util.Map; |
mcimadamore@160 | 46 | import java.util.HashMap; |
mcimadamore@160 | 47 | |
duke@1 | 48 | /** Helper class for name resolution, used mostly by the attribution phase. |
duke@1 | 49 | * |
duke@1 | 50 | * <p><b>This is NOT part of any API supported by Sun Microsystems. If |
duke@1 | 51 | * you write code that depends on this, you do so at your own risk. |
duke@1 | 52 | * This code and its internal interfaces are subject to change or |
duke@1 | 53 | * deletion without notice.</b> |
duke@1 | 54 | */ |
duke@1 | 55 | public class Resolve { |
duke@1 | 56 | protected static final Context.Key<Resolve> resolveKey = |
duke@1 | 57 | new Context.Key<Resolve>(); |
duke@1 | 58 | |
jjg@113 | 59 | Names names; |
duke@1 | 60 | Log log; |
duke@1 | 61 | Symtab syms; |
duke@1 | 62 | Check chk; |
duke@1 | 63 | Infer infer; |
duke@1 | 64 | ClassReader reader; |
duke@1 | 65 | TreeInfo treeinfo; |
duke@1 | 66 | Types types; |
mcimadamore@89 | 67 | JCDiagnostic.Factory diags; |
duke@1 | 68 | public final boolean boxingEnabled; // = source.allowBoxing(); |
duke@1 | 69 | public final boolean varargsEnabled; // = source.allowVarargs(); |
duke@1 | 70 | private final boolean debugResolve; |
duke@1 | 71 | |
duke@1 | 72 | public static Resolve instance(Context context) { |
duke@1 | 73 | Resolve instance = context.get(resolveKey); |
duke@1 | 74 | if (instance == null) |
duke@1 | 75 | instance = new Resolve(context); |
duke@1 | 76 | return instance; |
duke@1 | 77 | } |
duke@1 | 78 | |
duke@1 | 79 | protected Resolve(Context context) { |
duke@1 | 80 | context.put(resolveKey, this); |
duke@1 | 81 | syms = Symtab.instance(context); |
duke@1 | 82 | |
duke@1 | 83 | varNotFound = new |
duke@1 | 84 | ResolveError(ABSENT_VAR, syms.errSymbol, "variable not found"); |
duke@1 | 85 | wrongMethod = new |
duke@1 | 86 | ResolveError(WRONG_MTH, syms.errSymbol, "method not found"); |
duke@1 | 87 | wrongMethods = new |
duke@1 | 88 | ResolveError(WRONG_MTHS, syms.errSymbol, "wrong methods"); |
duke@1 | 89 | methodNotFound = new |
duke@1 | 90 | ResolveError(ABSENT_MTH, syms.errSymbol, "method not found"); |
duke@1 | 91 | typeNotFound = new |
duke@1 | 92 | ResolveError(ABSENT_TYP, syms.errSymbol, "type not found"); |
duke@1 | 93 | |
jjg@113 | 94 | names = Names.instance(context); |
duke@1 | 95 | log = Log.instance(context); |
duke@1 | 96 | chk = Check.instance(context); |
duke@1 | 97 | infer = Infer.instance(context); |
duke@1 | 98 | reader = ClassReader.instance(context); |
duke@1 | 99 | treeinfo = TreeInfo.instance(context); |
duke@1 | 100 | types = Types.instance(context); |
mcimadamore@89 | 101 | diags = JCDiagnostic.Factory.instance(context); |
duke@1 | 102 | Source source = Source.instance(context); |
duke@1 | 103 | boxingEnabled = source.allowBoxing(); |
duke@1 | 104 | varargsEnabled = source.allowVarargs(); |
duke@1 | 105 | Options options = Options.instance(context); |
duke@1 | 106 | debugResolve = options.get("debugresolve") != null; |
duke@1 | 107 | } |
duke@1 | 108 | |
duke@1 | 109 | /** error symbols, which are returned when resolution fails |
duke@1 | 110 | */ |
duke@1 | 111 | final ResolveError varNotFound; |
duke@1 | 112 | final ResolveError wrongMethod; |
duke@1 | 113 | final ResolveError wrongMethods; |
duke@1 | 114 | final ResolveError methodNotFound; |
duke@1 | 115 | final ResolveError typeNotFound; |
duke@1 | 116 | |
duke@1 | 117 | /* ************************************************************************ |
duke@1 | 118 | * Identifier resolution |
duke@1 | 119 | *************************************************************************/ |
duke@1 | 120 | |
duke@1 | 121 | /** An environment is "static" if its static level is greater than |
duke@1 | 122 | * the one of its outer environment |
duke@1 | 123 | */ |
duke@1 | 124 | static boolean isStatic(Env<AttrContext> env) { |
duke@1 | 125 | return env.info.staticLevel > env.outer.info.staticLevel; |
duke@1 | 126 | } |
duke@1 | 127 | |
duke@1 | 128 | /** An environment is an "initializer" if it is a constructor or |
duke@1 | 129 | * an instance initializer. |
duke@1 | 130 | */ |
duke@1 | 131 | static boolean isInitializer(Env<AttrContext> env) { |
duke@1 | 132 | Symbol owner = env.info.scope.owner; |
duke@1 | 133 | return owner.isConstructor() || |
duke@1 | 134 | owner.owner.kind == TYP && |
duke@1 | 135 | (owner.kind == VAR || |
duke@1 | 136 | owner.kind == MTH && (owner.flags() & BLOCK) != 0) && |
duke@1 | 137 | (owner.flags() & STATIC) == 0; |
duke@1 | 138 | } |
duke@1 | 139 | |
duke@1 | 140 | /** Is class accessible in given evironment? |
duke@1 | 141 | * @param env The current environment. |
duke@1 | 142 | * @param c The class whose accessibility is checked. |
duke@1 | 143 | */ |
duke@1 | 144 | public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) { |
duke@1 | 145 | switch ((short)(c.flags() & AccessFlags)) { |
duke@1 | 146 | case PRIVATE: |
duke@1 | 147 | return |
duke@1 | 148 | env.enclClass.sym.outermostClass() == |
duke@1 | 149 | c.owner.outermostClass(); |
duke@1 | 150 | case 0: |
duke@1 | 151 | return |
duke@1 | 152 | env.toplevel.packge == c.owner // fast special case |
duke@1 | 153 | || |
duke@1 | 154 | env.toplevel.packge == c.packge() |
duke@1 | 155 | || |
duke@1 | 156 | // Hack: this case is added since synthesized default constructors |
duke@1 | 157 | // of anonymous classes should be allowed to access |
duke@1 | 158 | // classes which would be inaccessible otherwise. |
duke@1 | 159 | env.enclMethod != null && |
duke@1 | 160 | (env.enclMethod.mods.flags & ANONCONSTR) != 0; |
duke@1 | 161 | default: // error recovery |
duke@1 | 162 | case PUBLIC: |
duke@1 | 163 | return true; |
duke@1 | 164 | case PROTECTED: |
duke@1 | 165 | return |
duke@1 | 166 | env.toplevel.packge == c.owner // fast special case |
duke@1 | 167 | || |
duke@1 | 168 | env.toplevel.packge == c.packge() |
duke@1 | 169 | || |
duke@1 | 170 | isInnerSubClass(env.enclClass.sym, c.owner); |
duke@1 | 171 | } |
duke@1 | 172 | } |
duke@1 | 173 | //where |
duke@1 | 174 | /** Is given class a subclass of given base class, or an inner class |
duke@1 | 175 | * of a subclass? |
duke@1 | 176 | * Return null if no such class exists. |
duke@1 | 177 | * @param c The class which is the subclass or is contained in it. |
duke@1 | 178 | * @param base The base class |
duke@1 | 179 | */ |
duke@1 | 180 | private boolean isInnerSubClass(ClassSymbol c, Symbol base) { |
duke@1 | 181 | while (c != null && !c.isSubClass(base, types)) { |
duke@1 | 182 | c = c.owner.enclClass(); |
duke@1 | 183 | } |
duke@1 | 184 | return c != null; |
duke@1 | 185 | } |
duke@1 | 186 | |
duke@1 | 187 | boolean isAccessible(Env<AttrContext> env, Type t) { |
duke@1 | 188 | return (t.tag == ARRAY) |
duke@1 | 189 | ? isAccessible(env, types.elemtype(t)) |
duke@1 | 190 | : isAccessible(env, t.tsym); |
duke@1 | 191 | } |
duke@1 | 192 | |
duke@1 | 193 | /** Is symbol accessible as a member of given type in given evironment? |
duke@1 | 194 | * @param env The current environment. |
duke@1 | 195 | * @param site The type of which the tested symbol is regarded |
duke@1 | 196 | * as a member. |
duke@1 | 197 | * @param sym The symbol. |
duke@1 | 198 | */ |
duke@1 | 199 | public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) { |
duke@1 | 200 | if (sym.name == names.init && sym.owner != site.tsym) return false; |
duke@1 | 201 | ClassSymbol sub; |
duke@1 | 202 | switch ((short)(sym.flags() & AccessFlags)) { |
duke@1 | 203 | case PRIVATE: |
duke@1 | 204 | return |
duke@1 | 205 | (env.enclClass.sym == sym.owner // fast special case |
duke@1 | 206 | || |
duke@1 | 207 | env.enclClass.sym.outermostClass() == |
duke@1 | 208 | sym.owner.outermostClass()) |
duke@1 | 209 | && |
duke@1 | 210 | sym.isInheritedIn(site.tsym, types); |
duke@1 | 211 | case 0: |
duke@1 | 212 | return |
duke@1 | 213 | (env.toplevel.packge == sym.owner.owner // fast special case |
duke@1 | 214 | || |
duke@1 | 215 | env.toplevel.packge == sym.packge()) |
duke@1 | 216 | && |
duke@1 | 217 | isAccessible(env, site) |
duke@1 | 218 | && |
duke@1 | 219 | sym.isInheritedIn(site.tsym, types); |
duke@1 | 220 | case PROTECTED: |
duke@1 | 221 | return |
duke@1 | 222 | (env.toplevel.packge == sym.owner.owner // fast special case |
duke@1 | 223 | || |
duke@1 | 224 | env.toplevel.packge == sym.packge() |
duke@1 | 225 | || |
duke@1 | 226 | isProtectedAccessible(sym, env.enclClass.sym, site) |
duke@1 | 227 | || |
duke@1 | 228 | // OK to select instance method or field from 'super' or type name |
duke@1 | 229 | // (but type names should be disallowed elsewhere!) |
duke@1 | 230 | env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP) |
duke@1 | 231 | && |
duke@1 | 232 | isAccessible(env, site) |
duke@1 | 233 | && |
duke@1 | 234 | // `sym' is accessible only if not overridden by |
duke@1 | 235 | // another symbol which is a member of `site' |
duke@1 | 236 | // (because, if it is overridden, `sym' is not strictly |
duke@1 | 237 | // speaking a member of `site'.) |
mcimadamore@40 | 238 | (sym.kind != MTH || sym.isConstructor() || sym.isStatic() || |
duke@1 | 239 | ((MethodSymbol)sym).implementation(site.tsym, types, true) == sym); |
duke@1 | 240 | default: // this case includes erroneous combinations as well |
duke@1 | 241 | return isAccessible(env, site); |
duke@1 | 242 | } |
duke@1 | 243 | } |
duke@1 | 244 | //where |
duke@1 | 245 | /** Is given protected symbol accessible if it is selected from given site |
duke@1 | 246 | * and the selection takes place in given class? |
duke@1 | 247 | * @param sym The symbol with protected access |
duke@1 | 248 | * @param c The class where the access takes place |
duke@1 | 249 | * @site The type of the qualifier |
duke@1 | 250 | */ |
duke@1 | 251 | private |
duke@1 | 252 | boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) { |
duke@1 | 253 | while (c != null && |
duke@1 | 254 | !(c.isSubClass(sym.owner, types) && |
duke@1 | 255 | (c.flags() & INTERFACE) == 0 && |
duke@1 | 256 | // In JLS 2e 6.6.2.1, the subclass restriction applies |
duke@1 | 257 | // only to instance fields and methods -- types are excluded |
duke@1 | 258 | // regardless of whether they are declared 'static' or not. |
duke@1 | 259 | ((sym.flags() & STATIC) != 0 || sym.kind == TYP || site.tsym.isSubClass(c, types)))) |
duke@1 | 260 | c = c.owner.enclClass(); |
duke@1 | 261 | return c != null; |
duke@1 | 262 | } |
duke@1 | 263 | |
duke@1 | 264 | /** Try to instantiate the type of a method so that it fits |
duke@1 | 265 | * given type arguments and argument types. If succesful, return |
duke@1 | 266 | * the method's instantiated type, else return null. |
duke@1 | 267 | * The instantiation will take into account an additional leading |
duke@1 | 268 | * formal parameter if the method is an instance method seen as a member |
duke@1 | 269 | * of un underdetermined site In this case, we treat site as an additional |
duke@1 | 270 | * parameter and the parameters of the class containing the method as |
duke@1 | 271 | * additional type variables that get instantiated. |
duke@1 | 272 | * |
duke@1 | 273 | * @param env The current environment |
duke@1 | 274 | * @param site The type of which the method is a member. |
duke@1 | 275 | * @param m The method symbol. |
duke@1 | 276 | * @param argtypes The invocation's given value arguments. |
duke@1 | 277 | * @param typeargtypes The invocation's given type arguments. |
duke@1 | 278 | * @param allowBoxing Allow boxing conversions of arguments. |
duke@1 | 279 | * @param useVarargs Box trailing arguments into an array for varargs. |
duke@1 | 280 | */ |
duke@1 | 281 | Type rawInstantiate(Env<AttrContext> env, |
duke@1 | 282 | Type site, |
duke@1 | 283 | Symbol m, |
duke@1 | 284 | List<Type> argtypes, |
duke@1 | 285 | List<Type> typeargtypes, |
duke@1 | 286 | boolean allowBoxing, |
duke@1 | 287 | boolean useVarargs, |
duke@1 | 288 | Warner warn) |
duke@1 | 289 | throws Infer.NoInstanceException { |
duke@1 | 290 | if (useVarargs && (m.flags() & VARARGS) == 0) return null; |
duke@1 | 291 | Type mt = types.memberType(site, m); |
duke@1 | 292 | |
duke@1 | 293 | // tvars is the list of formal type variables for which type arguments |
duke@1 | 294 | // need to inferred. |
duke@1 | 295 | List<Type> tvars = env.info.tvars; |
duke@1 | 296 | if (typeargtypes == null) typeargtypes = List.nil(); |
duke@1 | 297 | if (mt.tag != FORALL && typeargtypes.nonEmpty()) { |
duke@1 | 298 | // This is not a polymorphic method, but typeargs are supplied |
duke@1 | 299 | // which is fine, see JLS3 15.12.2.1 |
duke@1 | 300 | } else if (mt.tag == FORALL && typeargtypes.nonEmpty()) { |
duke@1 | 301 | ForAll pmt = (ForAll) mt; |
duke@1 | 302 | if (typeargtypes.length() != pmt.tvars.length()) |
duke@1 | 303 | return null; |
duke@1 | 304 | // Check type arguments are within bounds |
duke@1 | 305 | List<Type> formals = pmt.tvars; |
duke@1 | 306 | List<Type> actuals = typeargtypes; |
duke@1 | 307 | while (formals.nonEmpty() && actuals.nonEmpty()) { |
duke@1 | 308 | List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head), |
duke@1 | 309 | pmt.tvars, typeargtypes); |
duke@1 | 310 | for (; bounds.nonEmpty(); bounds = bounds.tail) |
duke@1 | 311 | if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn)) |
duke@1 | 312 | return null; |
duke@1 | 313 | formals = formals.tail; |
duke@1 | 314 | actuals = actuals.tail; |
duke@1 | 315 | } |
duke@1 | 316 | mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes); |
duke@1 | 317 | } else if (mt.tag == FORALL) { |
duke@1 | 318 | ForAll pmt = (ForAll) mt; |
duke@1 | 319 | List<Type> tvars1 = types.newInstances(pmt.tvars); |
duke@1 | 320 | tvars = tvars.appendList(tvars1); |
duke@1 | 321 | mt = types.subst(pmt.qtype, pmt.tvars, tvars1); |
duke@1 | 322 | } |
duke@1 | 323 | |
duke@1 | 324 | // find out whether we need to go the slow route via infer |
duke@1 | 325 | boolean instNeeded = tvars.tail != null/*inlined: tvars.nonEmpty()*/; |
duke@1 | 326 | for (List<Type> l = argtypes; |
duke@1 | 327 | l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded; |
duke@1 | 328 | l = l.tail) { |
duke@1 | 329 | if (l.head.tag == FORALL) instNeeded = true; |
duke@1 | 330 | } |
duke@1 | 331 | |
duke@1 | 332 | if (instNeeded) |
duke@1 | 333 | return |
duke@1 | 334 | infer.instantiateMethod(tvars, |
duke@1 | 335 | (MethodType)mt, |
duke@1 | 336 | argtypes, |
duke@1 | 337 | allowBoxing, |
duke@1 | 338 | useVarargs, |
duke@1 | 339 | warn); |
duke@1 | 340 | return |
duke@1 | 341 | argumentsAcceptable(argtypes, mt.getParameterTypes(), |
duke@1 | 342 | allowBoxing, useVarargs, warn) |
duke@1 | 343 | ? mt |
duke@1 | 344 | : null; |
duke@1 | 345 | } |
duke@1 | 346 | |
duke@1 | 347 | /** Same but returns null instead throwing a NoInstanceException |
duke@1 | 348 | */ |
duke@1 | 349 | Type instantiate(Env<AttrContext> env, |
duke@1 | 350 | Type site, |
duke@1 | 351 | Symbol m, |
duke@1 | 352 | List<Type> argtypes, |
duke@1 | 353 | List<Type> typeargtypes, |
duke@1 | 354 | boolean allowBoxing, |
duke@1 | 355 | boolean useVarargs, |
duke@1 | 356 | Warner warn) { |
duke@1 | 357 | try { |
duke@1 | 358 | return rawInstantiate(env, site, m, argtypes, typeargtypes, |
duke@1 | 359 | allowBoxing, useVarargs, warn); |
duke@1 | 360 | } catch (Infer.NoInstanceException ex) { |
duke@1 | 361 | return null; |
duke@1 | 362 | } |
duke@1 | 363 | } |
duke@1 | 364 | |
duke@1 | 365 | /** Check if a parameter list accepts a list of args. |
duke@1 | 366 | */ |
duke@1 | 367 | boolean argumentsAcceptable(List<Type> argtypes, |
duke@1 | 368 | List<Type> formals, |
duke@1 | 369 | boolean allowBoxing, |
duke@1 | 370 | boolean useVarargs, |
duke@1 | 371 | Warner warn) { |
duke@1 | 372 | Type varargsFormal = useVarargs ? formals.last() : null; |
duke@1 | 373 | while (argtypes.nonEmpty() && formals.head != varargsFormal) { |
duke@1 | 374 | boolean works = allowBoxing |
duke@1 | 375 | ? types.isConvertible(argtypes.head, formals.head, warn) |
duke@1 | 376 | : types.isSubtypeUnchecked(argtypes.head, formals.head, warn); |
duke@1 | 377 | if (!works) return false; |
duke@1 | 378 | argtypes = argtypes.tail; |
duke@1 | 379 | formals = formals.tail; |
duke@1 | 380 | } |
duke@1 | 381 | if (formals.head != varargsFormal) return false; // not enough args |
duke@1 | 382 | if (!useVarargs) |
duke@1 | 383 | return argtypes.isEmpty(); |
duke@1 | 384 | Type elt = types.elemtype(varargsFormal); |
duke@1 | 385 | while (argtypes.nonEmpty()) { |
duke@1 | 386 | if (!types.isConvertible(argtypes.head, elt, warn)) |
duke@1 | 387 | return false; |
duke@1 | 388 | argtypes = argtypes.tail; |
duke@1 | 389 | } |
duke@1 | 390 | return true; |
duke@1 | 391 | } |
duke@1 | 392 | |
duke@1 | 393 | /* *************************************************************************** |
duke@1 | 394 | * Symbol lookup |
duke@1 | 395 | * the following naming conventions for arguments are used |
duke@1 | 396 | * |
duke@1 | 397 | * env is the environment where the symbol was mentioned |
duke@1 | 398 | * site is the type of which the symbol is a member |
duke@1 | 399 | * name is the symbol's name |
duke@1 | 400 | * if no arguments are given |
duke@1 | 401 | * argtypes are the value arguments, if we search for a method |
duke@1 | 402 | * |
duke@1 | 403 | * If no symbol was found, a ResolveError detailing the problem is returned. |
duke@1 | 404 | ****************************************************************************/ |
duke@1 | 405 | |
duke@1 | 406 | /** Find field. Synthetic fields are always skipped. |
duke@1 | 407 | * @param env The current environment. |
duke@1 | 408 | * @param site The original type from where the selection takes place. |
duke@1 | 409 | * @param name The name of the field. |
duke@1 | 410 | * @param c The class to search for the field. This is always |
duke@1 | 411 | * a superclass or implemented interface of site's class. |
duke@1 | 412 | */ |
duke@1 | 413 | Symbol findField(Env<AttrContext> env, |
duke@1 | 414 | Type site, |
duke@1 | 415 | Name name, |
duke@1 | 416 | TypeSymbol c) { |
mcimadamore@19 | 417 | while (c.type.tag == TYPEVAR) |
mcimadamore@19 | 418 | c = c.type.getUpperBound().tsym; |
duke@1 | 419 | Symbol bestSoFar = varNotFound; |
duke@1 | 420 | Symbol sym; |
duke@1 | 421 | Scope.Entry e = c.members().lookup(name); |
duke@1 | 422 | while (e.scope != null) { |
duke@1 | 423 | if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) { |
duke@1 | 424 | return isAccessible(env, site, e.sym) |
duke@1 | 425 | ? e.sym : new AccessError(env, site, e.sym); |
duke@1 | 426 | } |
duke@1 | 427 | e = e.next(); |
duke@1 | 428 | } |
duke@1 | 429 | Type st = types.supertype(c.type); |
mcimadamore@19 | 430 | if (st != null && (st.tag == CLASS || st.tag == TYPEVAR)) { |
duke@1 | 431 | sym = findField(env, site, name, st.tsym); |
duke@1 | 432 | if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 433 | } |
duke@1 | 434 | for (List<Type> l = types.interfaces(c.type); |
duke@1 | 435 | bestSoFar.kind != AMBIGUOUS && l.nonEmpty(); |
duke@1 | 436 | l = l.tail) { |
duke@1 | 437 | sym = findField(env, site, name, l.head.tsym); |
duke@1 | 438 | if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS && |
duke@1 | 439 | sym.owner != bestSoFar.owner) |
duke@1 | 440 | bestSoFar = new AmbiguityError(bestSoFar, sym); |
duke@1 | 441 | else if (sym.kind < bestSoFar.kind) |
duke@1 | 442 | bestSoFar = sym; |
duke@1 | 443 | } |
duke@1 | 444 | return bestSoFar; |
duke@1 | 445 | } |
duke@1 | 446 | |
duke@1 | 447 | /** Resolve a field identifier, throw a fatal error if not found. |
duke@1 | 448 | * @param pos The position to use for error reporting. |
duke@1 | 449 | * @param env The environment current at the method invocation. |
duke@1 | 450 | * @param site The type of the qualifying expression, in which |
duke@1 | 451 | * identifier is searched. |
duke@1 | 452 | * @param name The identifier's name. |
duke@1 | 453 | */ |
duke@1 | 454 | public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env, |
duke@1 | 455 | Type site, Name name) { |
duke@1 | 456 | Symbol sym = findField(env, site, name, site.tsym); |
duke@1 | 457 | if (sym.kind == VAR) return (VarSymbol)sym; |
duke@1 | 458 | else throw new FatalError( |
mcimadamore@89 | 459 | diags.fragment("fatal.err.cant.locate.field", |
duke@1 | 460 | name)); |
duke@1 | 461 | } |
duke@1 | 462 | |
duke@1 | 463 | /** Find unqualified variable or field with given name. |
duke@1 | 464 | * Synthetic fields always skipped. |
duke@1 | 465 | * @param env The current environment. |
duke@1 | 466 | * @param name The name of the variable or field. |
duke@1 | 467 | */ |
duke@1 | 468 | Symbol findVar(Env<AttrContext> env, Name name) { |
duke@1 | 469 | Symbol bestSoFar = varNotFound; |
duke@1 | 470 | Symbol sym; |
duke@1 | 471 | Env<AttrContext> env1 = env; |
duke@1 | 472 | boolean staticOnly = false; |
duke@1 | 473 | while (env1.outer != null) { |
duke@1 | 474 | if (isStatic(env1)) staticOnly = true; |
duke@1 | 475 | Scope.Entry e = env1.info.scope.lookup(name); |
duke@1 | 476 | while (e.scope != null && |
duke@1 | 477 | (e.sym.kind != VAR || |
duke@1 | 478 | (e.sym.flags_field & SYNTHETIC) != 0)) |
duke@1 | 479 | e = e.next(); |
duke@1 | 480 | sym = (e.scope != null) |
duke@1 | 481 | ? e.sym |
duke@1 | 482 | : findField( |
duke@1 | 483 | env1, env1.enclClass.sym.type, name, env1.enclClass.sym); |
duke@1 | 484 | if (sym.exists()) { |
duke@1 | 485 | if (staticOnly && |
duke@1 | 486 | sym.kind == VAR && |
duke@1 | 487 | sym.owner.kind == TYP && |
duke@1 | 488 | (sym.flags() & STATIC) == 0) |
duke@1 | 489 | return new StaticError(sym); |
duke@1 | 490 | else |
duke@1 | 491 | return sym; |
duke@1 | 492 | } else if (sym.kind < bestSoFar.kind) { |
duke@1 | 493 | bestSoFar = sym; |
duke@1 | 494 | } |
duke@1 | 495 | |
duke@1 | 496 | if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true; |
duke@1 | 497 | env1 = env1.outer; |
duke@1 | 498 | } |
duke@1 | 499 | |
duke@1 | 500 | sym = findField(env, syms.predefClass.type, name, syms.predefClass); |
duke@1 | 501 | if (sym.exists()) |
duke@1 | 502 | return sym; |
duke@1 | 503 | if (bestSoFar.exists()) |
duke@1 | 504 | return bestSoFar; |
duke@1 | 505 | |
duke@1 | 506 | Scope.Entry e = env.toplevel.namedImportScope.lookup(name); |
duke@1 | 507 | for (; e.scope != null; e = e.next()) { |
duke@1 | 508 | sym = e.sym; |
duke@1 | 509 | Type origin = e.getOrigin().owner.type; |
duke@1 | 510 | if (sym.kind == VAR) { |
duke@1 | 511 | if (e.sym.owner.type != origin) |
duke@1 | 512 | sym = sym.clone(e.getOrigin().owner); |
duke@1 | 513 | return isAccessible(env, origin, sym) |
duke@1 | 514 | ? sym : new AccessError(env, origin, sym); |
duke@1 | 515 | } |
duke@1 | 516 | } |
duke@1 | 517 | |
duke@1 | 518 | Symbol origin = null; |
duke@1 | 519 | e = env.toplevel.starImportScope.lookup(name); |
duke@1 | 520 | for (; e.scope != null; e = e.next()) { |
duke@1 | 521 | sym = e.sym; |
duke@1 | 522 | if (sym.kind != VAR) |
duke@1 | 523 | continue; |
duke@1 | 524 | // invariant: sym.kind == VAR |
duke@1 | 525 | if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner) |
duke@1 | 526 | return new AmbiguityError(bestSoFar, sym); |
duke@1 | 527 | else if (bestSoFar.kind >= VAR) { |
duke@1 | 528 | origin = e.getOrigin().owner; |
duke@1 | 529 | bestSoFar = isAccessible(env, origin.type, sym) |
duke@1 | 530 | ? sym : new AccessError(env, origin.type, sym); |
duke@1 | 531 | } |
duke@1 | 532 | } |
duke@1 | 533 | if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type) |
duke@1 | 534 | return bestSoFar.clone(origin); |
duke@1 | 535 | else |
duke@1 | 536 | return bestSoFar; |
duke@1 | 537 | } |
duke@1 | 538 | |
duke@1 | 539 | Warner noteWarner = new Warner(); |
duke@1 | 540 | |
duke@1 | 541 | /** Select the best method for a call site among two choices. |
duke@1 | 542 | * @param env The current environment. |
duke@1 | 543 | * @param site The original type from where the |
duke@1 | 544 | * selection takes place. |
duke@1 | 545 | * @param argtypes The invocation's value arguments, |
duke@1 | 546 | * @param typeargtypes The invocation's type arguments, |
duke@1 | 547 | * @param sym Proposed new best match. |
duke@1 | 548 | * @param bestSoFar Previously found best match. |
duke@1 | 549 | * @param allowBoxing Allow boxing conversions of arguments. |
duke@1 | 550 | * @param useVarargs Box trailing arguments into an array for varargs. |
duke@1 | 551 | */ |
duke@1 | 552 | Symbol selectBest(Env<AttrContext> env, |
duke@1 | 553 | Type site, |
duke@1 | 554 | List<Type> argtypes, |
duke@1 | 555 | List<Type> typeargtypes, |
duke@1 | 556 | Symbol sym, |
duke@1 | 557 | Symbol bestSoFar, |
duke@1 | 558 | boolean allowBoxing, |
duke@1 | 559 | boolean useVarargs, |
duke@1 | 560 | boolean operator) { |
duke@1 | 561 | if (sym.kind == ERR) return bestSoFar; |
duke@1 | 562 | assert sym.kind < AMBIGUOUS; |
duke@1 | 563 | try { |
duke@1 | 564 | if (rawInstantiate(env, site, sym, argtypes, typeargtypes, |
duke@1 | 565 | allowBoxing, useVarargs, Warner.noWarnings) == null) { |
duke@1 | 566 | // inapplicable |
duke@1 | 567 | switch (bestSoFar.kind) { |
duke@1 | 568 | case ABSENT_MTH: return wrongMethod.setWrongSym(sym); |
duke@1 | 569 | case WRONG_MTH: return wrongMethods; |
duke@1 | 570 | default: return bestSoFar; |
duke@1 | 571 | } |
duke@1 | 572 | } |
duke@1 | 573 | } catch (Infer.NoInstanceException ex) { |
duke@1 | 574 | switch (bestSoFar.kind) { |
duke@1 | 575 | case ABSENT_MTH: |
duke@1 | 576 | return wrongMethod.setWrongSym(sym, ex.getDiagnostic()); |
duke@1 | 577 | case WRONG_MTH: |
duke@1 | 578 | return wrongMethods; |
duke@1 | 579 | default: |
duke@1 | 580 | return bestSoFar; |
duke@1 | 581 | } |
duke@1 | 582 | } |
duke@1 | 583 | if (!isAccessible(env, site, sym)) { |
duke@1 | 584 | return (bestSoFar.kind == ABSENT_MTH) |
duke@1 | 585 | ? new AccessError(env, site, sym) |
duke@1 | 586 | : bestSoFar; |
duke@1 | 587 | } |
duke@1 | 588 | return (bestSoFar.kind > AMBIGUOUS) |
duke@1 | 589 | ? sym |
duke@1 | 590 | : mostSpecific(sym, bestSoFar, env, site, |
duke@1 | 591 | allowBoxing && operator, useVarargs); |
duke@1 | 592 | } |
duke@1 | 593 | |
duke@1 | 594 | /* Return the most specific of the two methods for a call, |
duke@1 | 595 | * given that both are accessible and applicable. |
duke@1 | 596 | * @param m1 A new candidate for most specific. |
duke@1 | 597 | * @param m2 The previous most specific candidate. |
duke@1 | 598 | * @param env The current environment. |
duke@1 | 599 | * @param site The original type from where the selection |
duke@1 | 600 | * takes place. |
duke@1 | 601 | * @param allowBoxing Allow boxing conversions of arguments. |
duke@1 | 602 | * @param useVarargs Box trailing arguments into an array for varargs. |
duke@1 | 603 | */ |
duke@1 | 604 | Symbol mostSpecific(Symbol m1, |
duke@1 | 605 | Symbol m2, |
duke@1 | 606 | Env<AttrContext> env, |
duke@1 | 607 | Type site, |
duke@1 | 608 | boolean allowBoxing, |
duke@1 | 609 | boolean useVarargs) { |
duke@1 | 610 | switch (m2.kind) { |
duke@1 | 611 | case MTH: |
duke@1 | 612 | if (m1 == m2) return m1; |
duke@1 | 613 | Type mt1 = types.memberType(site, m1); |
duke@1 | 614 | noteWarner.unchecked = false; |
duke@1 | 615 | boolean m1SignatureMoreSpecific = |
duke@1 | 616 | (instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null, |
duke@1 | 617 | allowBoxing, false, noteWarner) != null || |
duke@1 | 618 | useVarargs && instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null, |
duke@1 | 619 | allowBoxing, true, noteWarner) != null) && |
duke@1 | 620 | !noteWarner.unchecked; |
duke@1 | 621 | Type mt2 = types.memberType(site, m2); |
duke@1 | 622 | noteWarner.unchecked = false; |
duke@1 | 623 | boolean m2SignatureMoreSpecific = |
duke@1 | 624 | (instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null, |
duke@1 | 625 | allowBoxing, false, noteWarner) != null || |
duke@1 | 626 | useVarargs && instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null, |
duke@1 | 627 | allowBoxing, true, noteWarner) != null) && |
duke@1 | 628 | !noteWarner.unchecked; |
duke@1 | 629 | if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) { |
duke@1 | 630 | if (!types.overrideEquivalent(mt1, mt2)) |
duke@1 | 631 | return new AmbiguityError(m1, m2); |
duke@1 | 632 | // same signature; select (a) the non-bridge method, or |
duke@1 | 633 | // (b) the one that overrides the other, or (c) the concrete |
duke@1 | 634 | // one, or (d) merge both abstract signatures |
duke@1 | 635 | if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE)) { |
duke@1 | 636 | return ((m1.flags() & BRIDGE) != 0) ? m2 : m1; |
duke@1 | 637 | } |
duke@1 | 638 | // if one overrides or hides the other, use it |
duke@1 | 639 | TypeSymbol m1Owner = (TypeSymbol)m1.owner; |
duke@1 | 640 | TypeSymbol m2Owner = (TypeSymbol)m2.owner; |
duke@1 | 641 | if (types.asSuper(m1Owner.type, m2Owner) != null && |
duke@1 | 642 | ((m1.owner.flags_field & INTERFACE) == 0 || |
duke@1 | 643 | (m2.owner.flags_field & INTERFACE) != 0) && |
duke@1 | 644 | m1.overrides(m2, m1Owner, types, false)) |
duke@1 | 645 | return m1; |
duke@1 | 646 | if (types.asSuper(m2Owner.type, m1Owner) != null && |
duke@1 | 647 | ((m2.owner.flags_field & INTERFACE) == 0 || |
duke@1 | 648 | (m1.owner.flags_field & INTERFACE) != 0) && |
duke@1 | 649 | m2.overrides(m1, m2Owner, types, false)) |
duke@1 | 650 | return m2; |
duke@1 | 651 | boolean m1Abstract = (m1.flags() & ABSTRACT) != 0; |
duke@1 | 652 | boolean m2Abstract = (m2.flags() & ABSTRACT) != 0; |
duke@1 | 653 | if (m1Abstract && !m2Abstract) return m2; |
duke@1 | 654 | if (m2Abstract && !m1Abstract) return m1; |
duke@1 | 655 | // both abstract or both concrete |
duke@1 | 656 | if (!m1Abstract && !m2Abstract) |
duke@1 | 657 | return new AmbiguityError(m1, m2); |
mcimadamore@156 | 658 | // check that both signatures have the same erasure |
mcimadamore@156 | 659 | if (!types.isSameTypes(m1.erasure(types).getParameterTypes(), |
mcimadamore@156 | 660 | m2.erasure(types).getParameterTypes())) |
duke@1 | 661 | return new AmbiguityError(m1, m2); |
duke@1 | 662 | // both abstract, neither overridden; merge throws clause and result type |
duke@1 | 663 | Symbol result; |
jjg@110 | 664 | Type result2 = mt2.getReturnType(); |
duke@1 | 665 | if (mt2.tag == FORALL) |
duke@1 | 666 | result2 = types.subst(result2, ((ForAll)mt2).tvars, ((ForAll)mt1).tvars); |
duke@1 | 667 | if (types.isSubtype(mt1.getReturnType(), result2)) { |
duke@1 | 668 | result = m1; |
duke@1 | 669 | } else if (types.isSubtype(result2, mt1.getReturnType())) { |
duke@1 | 670 | result = m2; |
duke@1 | 671 | } else { |
duke@1 | 672 | // Theoretically, this can't happen, but it is possible |
duke@1 | 673 | // due to error recovery or mixing incompatible class files |
duke@1 | 674 | return new AmbiguityError(m1, m2); |
duke@1 | 675 | } |
duke@1 | 676 | result = result.clone(result.owner); |
duke@1 | 677 | result.type = (Type)result.type.clone(); |
duke@1 | 678 | result.type.setThrown(chk.intersect(mt1.getThrownTypes(), |
duke@1 | 679 | mt2.getThrownTypes())); |
duke@1 | 680 | return result; |
duke@1 | 681 | } |
duke@1 | 682 | if (m1SignatureMoreSpecific) return m1; |
duke@1 | 683 | if (m2SignatureMoreSpecific) return m2; |
duke@1 | 684 | return new AmbiguityError(m1, m2); |
duke@1 | 685 | case AMBIGUOUS: |
duke@1 | 686 | AmbiguityError e = (AmbiguityError)m2; |
duke@1 | 687 | Symbol err1 = mostSpecific(m1, e.sym1, env, site, allowBoxing, useVarargs); |
duke@1 | 688 | Symbol err2 = mostSpecific(m1, e.sym2, env, site, allowBoxing, useVarargs); |
duke@1 | 689 | if (err1 == err2) return err1; |
duke@1 | 690 | if (err1 == e.sym1 && err2 == e.sym2) return m2; |
duke@1 | 691 | if (err1 instanceof AmbiguityError && |
duke@1 | 692 | err2 instanceof AmbiguityError && |
duke@1 | 693 | ((AmbiguityError)err1).sym1 == ((AmbiguityError)err2).sym1) |
duke@1 | 694 | return new AmbiguityError(m1, m2); |
duke@1 | 695 | else |
duke@1 | 696 | return new AmbiguityError(err1, err2); |
duke@1 | 697 | default: |
duke@1 | 698 | throw new AssertionError(); |
duke@1 | 699 | } |
duke@1 | 700 | } |
duke@1 | 701 | |
duke@1 | 702 | /** Find best qualified method matching given name, type and value |
duke@1 | 703 | * arguments. |
duke@1 | 704 | * @param env The current environment. |
duke@1 | 705 | * @param site The original type from where the selection |
duke@1 | 706 | * takes place. |
duke@1 | 707 | * @param name The method's name. |
duke@1 | 708 | * @param argtypes The method's value arguments. |
duke@1 | 709 | * @param typeargtypes The method's type arguments |
duke@1 | 710 | * @param allowBoxing Allow boxing conversions of arguments. |
duke@1 | 711 | * @param useVarargs Box trailing arguments into an array for varargs. |
duke@1 | 712 | */ |
duke@1 | 713 | Symbol findMethod(Env<AttrContext> env, |
duke@1 | 714 | Type site, |
duke@1 | 715 | Name name, |
duke@1 | 716 | List<Type> argtypes, |
duke@1 | 717 | List<Type> typeargtypes, |
duke@1 | 718 | boolean allowBoxing, |
duke@1 | 719 | boolean useVarargs, |
duke@1 | 720 | boolean operator) { |
duke@1 | 721 | return findMethod(env, |
duke@1 | 722 | site, |
duke@1 | 723 | name, |
duke@1 | 724 | argtypes, |
duke@1 | 725 | typeargtypes, |
duke@1 | 726 | site.tsym.type, |
duke@1 | 727 | true, |
duke@1 | 728 | methodNotFound, |
duke@1 | 729 | allowBoxing, |
duke@1 | 730 | useVarargs, |
duke@1 | 731 | operator); |
duke@1 | 732 | } |
duke@1 | 733 | // where |
duke@1 | 734 | private Symbol findMethod(Env<AttrContext> env, |
duke@1 | 735 | Type site, |
duke@1 | 736 | Name name, |
duke@1 | 737 | List<Type> argtypes, |
duke@1 | 738 | List<Type> typeargtypes, |
duke@1 | 739 | Type intype, |
duke@1 | 740 | boolean abstractok, |
duke@1 | 741 | Symbol bestSoFar, |
duke@1 | 742 | boolean allowBoxing, |
duke@1 | 743 | boolean useVarargs, |
duke@1 | 744 | boolean operator) { |
mcimadamore@19 | 745 | for (Type ct = intype; ct.tag == CLASS || ct.tag == TYPEVAR; ct = types.supertype(ct)) { |
mcimadamore@19 | 746 | while (ct.tag == TYPEVAR) |
mcimadamore@19 | 747 | ct = ct.getUpperBound(); |
duke@1 | 748 | ClassSymbol c = (ClassSymbol)ct.tsym; |
mcimadamore@135 | 749 | if ((c.flags() & (ABSTRACT | INTERFACE | ENUM)) == 0) |
duke@1 | 750 | abstractok = false; |
duke@1 | 751 | for (Scope.Entry e = c.members().lookup(name); |
duke@1 | 752 | e.scope != null; |
duke@1 | 753 | e = e.next()) { |
duke@1 | 754 | //- System.out.println(" e " + e.sym); |
duke@1 | 755 | if (e.sym.kind == MTH && |
duke@1 | 756 | (e.sym.flags_field & SYNTHETIC) == 0) { |
duke@1 | 757 | bestSoFar = selectBest(env, site, argtypes, typeargtypes, |
duke@1 | 758 | e.sym, bestSoFar, |
duke@1 | 759 | allowBoxing, |
duke@1 | 760 | useVarargs, |
duke@1 | 761 | operator); |
duke@1 | 762 | } |
duke@1 | 763 | } |
duke@1 | 764 | //- System.out.println(" - " + bestSoFar); |
duke@1 | 765 | if (abstractok) { |
duke@1 | 766 | Symbol concrete = methodNotFound; |
duke@1 | 767 | if ((bestSoFar.flags() & ABSTRACT) == 0) |
duke@1 | 768 | concrete = bestSoFar; |
duke@1 | 769 | for (List<Type> l = types.interfaces(c.type); |
duke@1 | 770 | l.nonEmpty(); |
duke@1 | 771 | l = l.tail) { |
duke@1 | 772 | bestSoFar = findMethod(env, site, name, argtypes, |
duke@1 | 773 | typeargtypes, |
duke@1 | 774 | l.head, abstractok, bestSoFar, |
duke@1 | 775 | allowBoxing, useVarargs, operator); |
duke@1 | 776 | } |
duke@1 | 777 | if (concrete != bestSoFar && |
duke@1 | 778 | concrete.kind < ERR && bestSoFar.kind < ERR && |
duke@1 | 779 | types.isSubSignature(concrete.type, bestSoFar.type)) |
duke@1 | 780 | bestSoFar = concrete; |
duke@1 | 781 | } |
duke@1 | 782 | } |
duke@1 | 783 | return bestSoFar; |
duke@1 | 784 | } |
duke@1 | 785 | |
duke@1 | 786 | /** Find unqualified method matching given name, type and value arguments. |
duke@1 | 787 | * @param env The current environment. |
duke@1 | 788 | * @param name The method's name. |
duke@1 | 789 | * @param argtypes The method's value arguments. |
duke@1 | 790 | * @param typeargtypes The method's type arguments. |
duke@1 | 791 | * @param allowBoxing Allow boxing conversions of arguments. |
duke@1 | 792 | * @param useVarargs Box trailing arguments into an array for varargs. |
duke@1 | 793 | */ |
duke@1 | 794 | Symbol findFun(Env<AttrContext> env, Name name, |
duke@1 | 795 | List<Type> argtypes, List<Type> typeargtypes, |
duke@1 | 796 | boolean allowBoxing, boolean useVarargs) { |
duke@1 | 797 | Symbol bestSoFar = methodNotFound; |
duke@1 | 798 | Symbol sym; |
duke@1 | 799 | Env<AttrContext> env1 = env; |
duke@1 | 800 | boolean staticOnly = false; |
duke@1 | 801 | while (env1.outer != null) { |
duke@1 | 802 | if (isStatic(env1)) staticOnly = true; |
duke@1 | 803 | sym = findMethod( |
duke@1 | 804 | env1, env1.enclClass.sym.type, name, argtypes, typeargtypes, |
duke@1 | 805 | allowBoxing, useVarargs, false); |
duke@1 | 806 | if (sym.exists()) { |
duke@1 | 807 | if (staticOnly && |
duke@1 | 808 | sym.kind == MTH && |
duke@1 | 809 | sym.owner.kind == TYP && |
duke@1 | 810 | (sym.flags() & STATIC) == 0) return new StaticError(sym); |
duke@1 | 811 | else return sym; |
duke@1 | 812 | } else if (sym.kind < bestSoFar.kind) { |
duke@1 | 813 | bestSoFar = sym; |
duke@1 | 814 | } |
duke@1 | 815 | if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true; |
duke@1 | 816 | env1 = env1.outer; |
duke@1 | 817 | } |
duke@1 | 818 | |
duke@1 | 819 | sym = findMethod(env, syms.predefClass.type, name, argtypes, |
duke@1 | 820 | typeargtypes, allowBoxing, useVarargs, false); |
duke@1 | 821 | if (sym.exists()) |
duke@1 | 822 | return sym; |
duke@1 | 823 | |
duke@1 | 824 | Scope.Entry e = env.toplevel.namedImportScope.lookup(name); |
duke@1 | 825 | for (; e.scope != null; e = e.next()) { |
duke@1 | 826 | sym = e.sym; |
duke@1 | 827 | Type origin = e.getOrigin().owner.type; |
duke@1 | 828 | if (sym.kind == MTH) { |
duke@1 | 829 | if (e.sym.owner.type != origin) |
duke@1 | 830 | sym = sym.clone(e.getOrigin().owner); |
duke@1 | 831 | if (!isAccessible(env, origin, sym)) |
duke@1 | 832 | sym = new AccessError(env, origin, sym); |
duke@1 | 833 | bestSoFar = selectBest(env, origin, |
duke@1 | 834 | argtypes, typeargtypes, |
duke@1 | 835 | sym, bestSoFar, |
duke@1 | 836 | allowBoxing, useVarargs, false); |
duke@1 | 837 | } |
duke@1 | 838 | } |
duke@1 | 839 | if (bestSoFar.exists()) |
duke@1 | 840 | return bestSoFar; |
duke@1 | 841 | |
duke@1 | 842 | e = env.toplevel.starImportScope.lookup(name); |
duke@1 | 843 | for (; e.scope != null; e = e.next()) { |
duke@1 | 844 | sym = e.sym; |
duke@1 | 845 | Type origin = e.getOrigin().owner.type; |
duke@1 | 846 | if (sym.kind == MTH) { |
duke@1 | 847 | if (e.sym.owner.type != origin) |
duke@1 | 848 | sym = sym.clone(e.getOrigin().owner); |
duke@1 | 849 | if (!isAccessible(env, origin, sym)) |
duke@1 | 850 | sym = new AccessError(env, origin, sym); |
duke@1 | 851 | bestSoFar = selectBest(env, origin, |
duke@1 | 852 | argtypes, typeargtypes, |
duke@1 | 853 | sym, bestSoFar, |
duke@1 | 854 | allowBoxing, useVarargs, false); |
duke@1 | 855 | } |
duke@1 | 856 | } |
duke@1 | 857 | return bestSoFar; |
duke@1 | 858 | } |
duke@1 | 859 | |
duke@1 | 860 | /** Load toplevel or member class with given fully qualified name and |
duke@1 | 861 | * verify that it is accessible. |
duke@1 | 862 | * @param env The current environment. |
duke@1 | 863 | * @param name The fully qualified name of the class to be loaded. |
duke@1 | 864 | */ |
duke@1 | 865 | Symbol loadClass(Env<AttrContext> env, Name name) { |
duke@1 | 866 | try { |
duke@1 | 867 | ClassSymbol c = reader.loadClass(name); |
duke@1 | 868 | return isAccessible(env, c) ? c : new AccessError(c); |
duke@1 | 869 | } catch (ClassReader.BadClassFile err) { |
duke@1 | 870 | throw err; |
duke@1 | 871 | } catch (CompletionFailure ex) { |
duke@1 | 872 | return typeNotFound; |
duke@1 | 873 | } |
duke@1 | 874 | } |
duke@1 | 875 | |
duke@1 | 876 | /** Find qualified member type. |
duke@1 | 877 | * @param env The current environment. |
duke@1 | 878 | * @param site The original type from where the selection takes |
duke@1 | 879 | * place. |
duke@1 | 880 | * @param name The type's name. |
duke@1 | 881 | * @param c The class to search for the member type. This is |
duke@1 | 882 | * always a superclass or implemented interface of |
duke@1 | 883 | * site's class. |
duke@1 | 884 | */ |
duke@1 | 885 | Symbol findMemberType(Env<AttrContext> env, |
duke@1 | 886 | Type site, |
duke@1 | 887 | Name name, |
duke@1 | 888 | TypeSymbol c) { |
duke@1 | 889 | Symbol bestSoFar = typeNotFound; |
duke@1 | 890 | Symbol sym; |
duke@1 | 891 | Scope.Entry e = c.members().lookup(name); |
duke@1 | 892 | while (e.scope != null) { |
duke@1 | 893 | if (e.sym.kind == TYP) { |
duke@1 | 894 | return isAccessible(env, site, e.sym) |
duke@1 | 895 | ? e.sym |
duke@1 | 896 | : new AccessError(env, site, e.sym); |
duke@1 | 897 | } |
duke@1 | 898 | e = e.next(); |
duke@1 | 899 | } |
duke@1 | 900 | Type st = types.supertype(c.type); |
duke@1 | 901 | if (st != null && st.tag == CLASS) { |
duke@1 | 902 | sym = findMemberType(env, site, name, st.tsym); |
duke@1 | 903 | if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 904 | } |
duke@1 | 905 | for (List<Type> l = types.interfaces(c.type); |
duke@1 | 906 | bestSoFar.kind != AMBIGUOUS && l.nonEmpty(); |
duke@1 | 907 | l = l.tail) { |
duke@1 | 908 | sym = findMemberType(env, site, name, l.head.tsym); |
duke@1 | 909 | if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS && |
duke@1 | 910 | sym.owner != bestSoFar.owner) |
duke@1 | 911 | bestSoFar = new AmbiguityError(bestSoFar, sym); |
duke@1 | 912 | else if (sym.kind < bestSoFar.kind) |
duke@1 | 913 | bestSoFar = sym; |
duke@1 | 914 | } |
duke@1 | 915 | return bestSoFar; |
duke@1 | 916 | } |
duke@1 | 917 | |
duke@1 | 918 | /** Find a global type in given scope and load corresponding class. |
duke@1 | 919 | * @param env The current environment. |
duke@1 | 920 | * @param scope The scope in which to look for the type. |
duke@1 | 921 | * @param name The type's name. |
duke@1 | 922 | */ |
duke@1 | 923 | Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) { |
duke@1 | 924 | Symbol bestSoFar = typeNotFound; |
duke@1 | 925 | for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) { |
duke@1 | 926 | Symbol sym = loadClass(env, e.sym.flatName()); |
duke@1 | 927 | if (bestSoFar.kind == TYP && sym.kind == TYP && |
duke@1 | 928 | bestSoFar != sym) |
duke@1 | 929 | return new AmbiguityError(bestSoFar, sym); |
duke@1 | 930 | else if (sym.kind < bestSoFar.kind) |
duke@1 | 931 | bestSoFar = sym; |
duke@1 | 932 | } |
duke@1 | 933 | return bestSoFar; |
duke@1 | 934 | } |
duke@1 | 935 | |
duke@1 | 936 | /** Find an unqualified type symbol. |
duke@1 | 937 | * @param env The current environment. |
duke@1 | 938 | * @param name The type's name. |
duke@1 | 939 | */ |
duke@1 | 940 | Symbol findType(Env<AttrContext> env, Name name) { |
duke@1 | 941 | Symbol bestSoFar = typeNotFound; |
duke@1 | 942 | Symbol sym; |
duke@1 | 943 | boolean staticOnly = false; |
duke@1 | 944 | for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) { |
duke@1 | 945 | if (isStatic(env1)) staticOnly = true; |
duke@1 | 946 | for (Scope.Entry e = env1.info.scope.lookup(name); |
duke@1 | 947 | e.scope != null; |
duke@1 | 948 | e = e.next()) { |
duke@1 | 949 | if (e.sym.kind == TYP) { |
duke@1 | 950 | if (staticOnly && |
duke@1 | 951 | e.sym.type.tag == TYPEVAR && |
duke@1 | 952 | e.sym.owner.kind == TYP) return new StaticError(e.sym); |
duke@1 | 953 | return e.sym; |
duke@1 | 954 | } |
duke@1 | 955 | } |
duke@1 | 956 | |
duke@1 | 957 | sym = findMemberType(env1, env1.enclClass.sym.type, name, |
duke@1 | 958 | env1.enclClass.sym); |
duke@1 | 959 | if (staticOnly && sym.kind == TYP && |
duke@1 | 960 | sym.type.tag == CLASS && |
duke@1 | 961 | sym.type.getEnclosingType().tag == CLASS && |
duke@1 | 962 | env1.enclClass.sym.type.isParameterized() && |
duke@1 | 963 | sym.type.getEnclosingType().isParameterized()) |
duke@1 | 964 | return new StaticError(sym); |
duke@1 | 965 | else if (sym.exists()) return sym; |
duke@1 | 966 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 967 | |
duke@1 | 968 | JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass; |
duke@1 | 969 | if ((encl.sym.flags() & STATIC) != 0) |
duke@1 | 970 | staticOnly = true; |
duke@1 | 971 | } |
duke@1 | 972 | |
duke@1 | 973 | if (env.tree.getTag() != JCTree.IMPORT) { |
duke@1 | 974 | sym = findGlobalType(env, env.toplevel.namedImportScope, name); |
duke@1 | 975 | if (sym.exists()) return sym; |
duke@1 | 976 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 977 | |
duke@1 | 978 | sym = findGlobalType(env, env.toplevel.packge.members(), name); |
duke@1 | 979 | if (sym.exists()) return sym; |
duke@1 | 980 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 981 | |
duke@1 | 982 | sym = findGlobalType(env, env.toplevel.starImportScope, name); |
duke@1 | 983 | if (sym.exists()) return sym; |
duke@1 | 984 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 985 | } |
duke@1 | 986 | |
duke@1 | 987 | return bestSoFar; |
duke@1 | 988 | } |
duke@1 | 989 | |
duke@1 | 990 | /** Find an unqualified identifier which matches a specified kind set. |
duke@1 | 991 | * @param env The current environment. |
duke@1 | 992 | * @param name The indentifier's name. |
duke@1 | 993 | * @param kind Indicates the possible symbol kinds |
duke@1 | 994 | * (a subset of VAL, TYP, PCK). |
duke@1 | 995 | */ |
duke@1 | 996 | Symbol findIdent(Env<AttrContext> env, Name name, int kind) { |
duke@1 | 997 | Symbol bestSoFar = typeNotFound; |
duke@1 | 998 | Symbol sym; |
duke@1 | 999 | |
duke@1 | 1000 | if ((kind & VAR) != 0) { |
duke@1 | 1001 | sym = findVar(env, name); |
duke@1 | 1002 | if (sym.exists()) return sym; |
duke@1 | 1003 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 1004 | } |
duke@1 | 1005 | |
duke@1 | 1006 | if ((kind & TYP) != 0) { |
duke@1 | 1007 | sym = findType(env, name); |
duke@1 | 1008 | if (sym.exists()) return sym; |
duke@1 | 1009 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 1010 | } |
duke@1 | 1011 | |
duke@1 | 1012 | if ((kind & PCK) != 0) return reader.enterPackage(name); |
duke@1 | 1013 | else return bestSoFar; |
duke@1 | 1014 | } |
duke@1 | 1015 | |
duke@1 | 1016 | /** Find an identifier in a package which matches a specified kind set. |
duke@1 | 1017 | * @param env The current environment. |
duke@1 | 1018 | * @param name The identifier's name. |
duke@1 | 1019 | * @param kind Indicates the possible symbol kinds |
duke@1 | 1020 | * (a nonempty subset of TYP, PCK). |
duke@1 | 1021 | */ |
duke@1 | 1022 | Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck, |
duke@1 | 1023 | Name name, int kind) { |
duke@1 | 1024 | Name fullname = TypeSymbol.formFullName(name, pck); |
duke@1 | 1025 | Symbol bestSoFar = typeNotFound; |
duke@1 | 1026 | PackageSymbol pack = null; |
duke@1 | 1027 | if ((kind & PCK) != 0) { |
duke@1 | 1028 | pack = reader.enterPackage(fullname); |
duke@1 | 1029 | if (pack.exists()) return pack; |
duke@1 | 1030 | } |
duke@1 | 1031 | if ((kind & TYP) != 0) { |
duke@1 | 1032 | Symbol sym = loadClass(env, fullname); |
duke@1 | 1033 | if (sym.exists()) { |
duke@1 | 1034 | // don't allow programs to use flatnames |
duke@1 | 1035 | if (name == sym.name) return sym; |
duke@1 | 1036 | } |
duke@1 | 1037 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 1038 | } |
duke@1 | 1039 | return (pack != null) ? pack : bestSoFar; |
duke@1 | 1040 | } |
duke@1 | 1041 | |
duke@1 | 1042 | /** Find an identifier among the members of a given type `site'. |
duke@1 | 1043 | * @param env The current environment. |
duke@1 | 1044 | * @param site The type containing the symbol to be found. |
duke@1 | 1045 | * @param name The identifier's name. |
duke@1 | 1046 | * @param kind Indicates the possible symbol kinds |
duke@1 | 1047 | * (a subset of VAL, TYP). |
duke@1 | 1048 | */ |
duke@1 | 1049 | Symbol findIdentInType(Env<AttrContext> env, Type site, |
duke@1 | 1050 | Name name, int kind) { |
duke@1 | 1051 | Symbol bestSoFar = typeNotFound; |
duke@1 | 1052 | Symbol sym; |
duke@1 | 1053 | if ((kind & VAR) != 0) { |
duke@1 | 1054 | sym = findField(env, site, name, site.tsym); |
duke@1 | 1055 | if (sym.exists()) return sym; |
duke@1 | 1056 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 1057 | } |
duke@1 | 1058 | |
duke@1 | 1059 | if ((kind & TYP) != 0) { |
duke@1 | 1060 | sym = findMemberType(env, site, name, site.tsym); |
duke@1 | 1061 | if (sym.exists()) return sym; |
duke@1 | 1062 | else if (sym.kind < bestSoFar.kind) bestSoFar = sym; |
duke@1 | 1063 | } |
duke@1 | 1064 | return bestSoFar; |
duke@1 | 1065 | } |
duke@1 | 1066 | |
duke@1 | 1067 | /* *************************************************************************** |
duke@1 | 1068 | * Access checking |
duke@1 | 1069 | * The following methods convert ResolveErrors to ErrorSymbols, issuing |
duke@1 | 1070 | * an error message in the process |
duke@1 | 1071 | ****************************************************************************/ |
duke@1 | 1072 | |
duke@1 | 1073 | /** If `sym' is a bad symbol: report error and return errSymbol |
duke@1 | 1074 | * else pass through unchanged, |
duke@1 | 1075 | * additional arguments duplicate what has been used in trying to find the |
duke@1 | 1076 | * symbol (--> flyweight pattern). This improves performance since we |
duke@1 | 1077 | * expect misses to happen frequently. |
duke@1 | 1078 | * |
duke@1 | 1079 | * @param sym The symbol that was found, or a ResolveError. |
duke@1 | 1080 | * @param pos The position to use for error reporting. |
duke@1 | 1081 | * @param site The original type from where the selection took place. |
duke@1 | 1082 | * @param name The symbol's name. |
duke@1 | 1083 | * @param argtypes The invocation's value arguments, |
duke@1 | 1084 | * if we looked for a method. |
duke@1 | 1085 | * @param typeargtypes The invocation's type arguments, |
duke@1 | 1086 | * if we looked for a method. |
duke@1 | 1087 | */ |
duke@1 | 1088 | Symbol access(Symbol sym, |
duke@1 | 1089 | DiagnosticPosition pos, |
duke@1 | 1090 | Type site, |
duke@1 | 1091 | Name name, |
duke@1 | 1092 | boolean qualified, |
duke@1 | 1093 | List<Type> argtypes, |
duke@1 | 1094 | List<Type> typeargtypes) { |
duke@1 | 1095 | if (sym.kind >= AMBIGUOUS) { |
duke@1 | 1096 | // printscopes(site.tsym.members());//DEBUG |
duke@1 | 1097 | if (!site.isErroneous() && |
duke@1 | 1098 | !Type.isErroneous(argtypes) && |
duke@1 | 1099 | (typeargtypes==null || !Type.isErroneous(typeargtypes))) |
duke@1 | 1100 | ((ResolveError)sym).report(log, pos, site, name, argtypes, typeargtypes); |
duke@1 | 1101 | do { |
duke@1 | 1102 | sym = ((ResolveError)sym).sym; |
duke@1 | 1103 | } while (sym.kind >= AMBIGUOUS); |
duke@1 | 1104 | if (sym == syms.errSymbol // preserve the symbol name through errors |
duke@1 | 1105 | || ((sym.kind & ERRONEOUS) == 0 // make sure an error symbol is returned |
duke@1 | 1106 | && (sym.kind & TYP) != 0)) |
jjg@110 | 1107 | sym = types.createErrorType(name, qualified ? site.tsym : syms.noSymbol, sym.type).tsym; |
duke@1 | 1108 | } |
duke@1 | 1109 | return sym; |
duke@1 | 1110 | } |
duke@1 | 1111 | |
duke@1 | 1112 | /** Same as above, but without type arguments and arguments. |
duke@1 | 1113 | */ |
duke@1 | 1114 | Symbol access(Symbol sym, |
duke@1 | 1115 | DiagnosticPosition pos, |
duke@1 | 1116 | Type site, |
duke@1 | 1117 | Name name, |
duke@1 | 1118 | boolean qualified) { |
duke@1 | 1119 | if (sym.kind >= AMBIGUOUS) |
duke@1 | 1120 | return access(sym, pos, site, name, qualified, List.<Type>nil(), null); |
duke@1 | 1121 | else |
duke@1 | 1122 | return sym; |
duke@1 | 1123 | } |
duke@1 | 1124 | |
duke@1 | 1125 | /** Check that sym is not an abstract method. |
duke@1 | 1126 | */ |
duke@1 | 1127 | void checkNonAbstract(DiagnosticPosition pos, Symbol sym) { |
duke@1 | 1128 | if ((sym.flags() & ABSTRACT) != 0) |
duke@1 | 1129 | log.error(pos, "abstract.cant.be.accessed.directly", |
duke@1 | 1130 | kindName(sym), sym, sym.location()); |
duke@1 | 1131 | } |
duke@1 | 1132 | |
duke@1 | 1133 | /* *************************************************************************** |
duke@1 | 1134 | * Debugging |
duke@1 | 1135 | ****************************************************************************/ |
duke@1 | 1136 | |
duke@1 | 1137 | /** print all scopes starting with scope s and proceeding outwards. |
duke@1 | 1138 | * used for debugging. |
duke@1 | 1139 | */ |
duke@1 | 1140 | public void printscopes(Scope s) { |
duke@1 | 1141 | while (s != null) { |
duke@1 | 1142 | if (s.owner != null) |
duke@1 | 1143 | System.err.print(s.owner + ": "); |
duke@1 | 1144 | for (Scope.Entry e = s.elems; e != null; e = e.sibling) { |
duke@1 | 1145 | if ((e.sym.flags() & ABSTRACT) != 0) |
duke@1 | 1146 | System.err.print("abstract "); |
duke@1 | 1147 | System.err.print(e.sym + " "); |
duke@1 | 1148 | } |
duke@1 | 1149 | System.err.println(); |
duke@1 | 1150 | s = s.next; |
duke@1 | 1151 | } |
duke@1 | 1152 | } |
duke@1 | 1153 | |
duke@1 | 1154 | void printscopes(Env<AttrContext> env) { |
duke@1 | 1155 | while (env.outer != null) { |
duke@1 | 1156 | System.err.println("------------------------------"); |
duke@1 | 1157 | printscopes(env.info.scope); |
duke@1 | 1158 | env = env.outer; |
duke@1 | 1159 | } |
duke@1 | 1160 | } |
duke@1 | 1161 | |
duke@1 | 1162 | public void printscopes(Type t) { |
duke@1 | 1163 | while (t.tag == CLASS) { |
duke@1 | 1164 | printscopes(t.tsym.members()); |
duke@1 | 1165 | t = types.supertype(t); |
duke@1 | 1166 | } |
duke@1 | 1167 | } |
duke@1 | 1168 | |
duke@1 | 1169 | /* *************************************************************************** |
duke@1 | 1170 | * Name resolution |
duke@1 | 1171 | * Naming conventions are as for symbol lookup |
duke@1 | 1172 | * Unlike the find... methods these methods will report access errors |
duke@1 | 1173 | ****************************************************************************/ |
duke@1 | 1174 | |
duke@1 | 1175 | /** Resolve an unqualified (non-method) identifier. |
duke@1 | 1176 | * @param pos The position to use for error reporting. |
duke@1 | 1177 | * @param env The environment current at the identifier use. |
duke@1 | 1178 | * @param name The identifier's name. |
duke@1 | 1179 | * @param kind The set of admissible symbol kinds for the identifier. |
duke@1 | 1180 | */ |
duke@1 | 1181 | Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env, |
duke@1 | 1182 | Name name, int kind) { |
duke@1 | 1183 | return access( |
duke@1 | 1184 | findIdent(env, name, kind), |
duke@1 | 1185 | pos, env.enclClass.sym.type, name, false); |
duke@1 | 1186 | } |
duke@1 | 1187 | |
duke@1 | 1188 | /** Resolve an unqualified method identifier. |
duke@1 | 1189 | * @param pos The position to use for error reporting. |
duke@1 | 1190 | * @param env The environment current at the method invocation. |
duke@1 | 1191 | * @param name The identifier's name. |
duke@1 | 1192 | * @param argtypes The types of the invocation's value arguments. |
duke@1 | 1193 | * @param typeargtypes The types of the invocation's type arguments. |
duke@1 | 1194 | */ |
duke@1 | 1195 | Symbol resolveMethod(DiagnosticPosition pos, |
duke@1 | 1196 | Env<AttrContext> env, |
duke@1 | 1197 | Name name, |
duke@1 | 1198 | List<Type> argtypes, |
duke@1 | 1199 | List<Type> typeargtypes) { |
mcimadamore@160 | 1200 | Symbol sym = methodNotFound; |
mcimadamore@160 | 1201 | List<MethodResolutionPhase> steps = methodResolutionSteps; |
mcimadamore@160 | 1202 | while (steps.nonEmpty() && |
mcimadamore@160 | 1203 | steps.head.isApplicable(boxingEnabled, varargsEnabled) && |
mcimadamore@160 | 1204 | sym.kind >= ERRONEOUS) { |
mcimadamore@160 | 1205 | sym = findFun(env, name, argtypes, typeargtypes, |
mcimadamore@160 | 1206 | steps.head.isBoxingRequired, |
mcimadamore@160 | 1207 | env.info.varArgs = steps.head.isVarargsRequired); |
mcimadamore@160 | 1208 | methodResolutionCache.put(steps.head, sym); |
mcimadamore@160 | 1209 | steps = steps.tail; |
duke@1 | 1210 | } |
mcimadamore@160 | 1211 | if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error |
mcimadamore@160 | 1212 | MethodResolutionPhase errPhase = |
mcimadamore@160 | 1213 | firstErroneousResolutionPhase(); |
mcimadamore@160 | 1214 | sym = access(methodResolutionCache.get(errPhase), |
mcimadamore@160 | 1215 | pos, env.enclClass.sym.type, name, false, argtypes, typeargtypes); |
mcimadamore@160 | 1216 | env.info.varArgs = errPhase.isVarargsRequired; |
duke@1 | 1217 | } |
duke@1 | 1218 | return sym; |
duke@1 | 1219 | } |
duke@1 | 1220 | |
duke@1 | 1221 | /** Resolve a qualified method identifier |
duke@1 | 1222 | * @param pos The position to use for error reporting. |
duke@1 | 1223 | * @param env The environment current at the method invocation. |
duke@1 | 1224 | * @param site The type of the qualifying expression, in which |
duke@1 | 1225 | * identifier is searched. |
duke@1 | 1226 | * @param name The identifier's name. |
duke@1 | 1227 | * @param argtypes The types of the invocation's value arguments. |
duke@1 | 1228 | * @param typeargtypes The types of the invocation's type arguments. |
duke@1 | 1229 | */ |
duke@1 | 1230 | Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env, |
duke@1 | 1231 | Type site, Name name, List<Type> argtypes, |
duke@1 | 1232 | List<Type> typeargtypes) { |
mcimadamore@160 | 1233 | Symbol sym = methodNotFound; |
mcimadamore@160 | 1234 | List<MethodResolutionPhase> steps = methodResolutionSteps; |
mcimadamore@160 | 1235 | while (steps.nonEmpty() && |
mcimadamore@160 | 1236 | steps.head.isApplicable(boxingEnabled, varargsEnabled) && |
mcimadamore@160 | 1237 | sym.kind >= ERRONEOUS) { |
mcimadamore@160 | 1238 | sym = findMethod(env, site, name, argtypes, typeargtypes, |
mcimadamore@160 | 1239 | steps.head.isBoxingRequired(), |
mcimadamore@160 | 1240 | env.info.varArgs = steps.head.isVarargsRequired(), false); |
mcimadamore@160 | 1241 | methodResolutionCache.put(steps.head, sym); |
mcimadamore@160 | 1242 | steps = steps.tail; |
duke@1 | 1243 | } |
mcimadamore@160 | 1244 | if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error |
mcimadamore@160 | 1245 | MethodResolutionPhase errPhase = |
mcimadamore@160 | 1246 | firstErroneousResolutionPhase(); |
mcimadamore@160 | 1247 | sym = access(methodResolutionCache.get(errPhase), |
mcimadamore@160 | 1248 | pos, site, name, true, argtypes, typeargtypes); |
mcimadamore@160 | 1249 | env.info.varArgs = errPhase.isVarargsRequired; |
duke@1 | 1250 | } |
duke@1 | 1251 | return sym; |
duke@1 | 1252 | } |
duke@1 | 1253 | |
duke@1 | 1254 | /** Resolve a qualified method identifier, throw a fatal error if not |
duke@1 | 1255 | * found. |
duke@1 | 1256 | * @param pos The position to use for error reporting. |
duke@1 | 1257 | * @param env The environment current at the method invocation. |
duke@1 | 1258 | * @param site The type of the qualifying expression, in which |
duke@1 | 1259 | * identifier is searched. |
duke@1 | 1260 | * @param name The identifier's name. |
duke@1 | 1261 | * @param argtypes The types of the invocation's value arguments. |
duke@1 | 1262 | * @param typeargtypes The types of the invocation's type arguments. |
duke@1 | 1263 | */ |
duke@1 | 1264 | public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env, |
duke@1 | 1265 | Type site, Name name, |
duke@1 | 1266 | List<Type> argtypes, |
duke@1 | 1267 | List<Type> typeargtypes) { |
duke@1 | 1268 | Symbol sym = resolveQualifiedMethod( |
duke@1 | 1269 | pos, env, site, name, argtypes, typeargtypes); |
duke@1 | 1270 | if (sym.kind == MTH) return (MethodSymbol)sym; |
duke@1 | 1271 | else throw new FatalError( |
mcimadamore@89 | 1272 | diags.fragment("fatal.err.cant.locate.meth", |
duke@1 | 1273 | name)); |
duke@1 | 1274 | } |
duke@1 | 1275 | |
duke@1 | 1276 | /** Resolve constructor. |
duke@1 | 1277 | * @param pos The position to use for error reporting. |
duke@1 | 1278 | * @param env The environment current at the constructor invocation. |
duke@1 | 1279 | * @param site The type of class for which a constructor is searched. |
duke@1 | 1280 | * @param argtypes The types of the constructor invocation's value |
duke@1 | 1281 | * arguments. |
duke@1 | 1282 | * @param typeargtypes The types of the constructor invocation's type |
duke@1 | 1283 | * arguments. |
duke@1 | 1284 | */ |
duke@1 | 1285 | Symbol resolveConstructor(DiagnosticPosition pos, |
duke@1 | 1286 | Env<AttrContext> env, |
duke@1 | 1287 | Type site, |
duke@1 | 1288 | List<Type> argtypes, |
duke@1 | 1289 | List<Type> typeargtypes) { |
mcimadamore@160 | 1290 | Symbol sym = methodNotFound; |
mcimadamore@160 | 1291 | List<MethodResolutionPhase> steps = methodResolutionSteps; |
mcimadamore@160 | 1292 | while (steps.nonEmpty() && |
mcimadamore@160 | 1293 | steps.head.isApplicable(boxingEnabled, varargsEnabled) && |
mcimadamore@160 | 1294 | sym.kind >= ERRONEOUS) { |
mcimadamore@160 | 1295 | sym = resolveConstructor(pos, env, site, argtypes, typeargtypes, |
mcimadamore@160 | 1296 | steps.head.isBoxingRequired(), |
mcimadamore@160 | 1297 | env.info.varArgs = steps.head.isVarargsRequired()); |
mcimadamore@160 | 1298 | methodResolutionCache.put(steps.head, sym); |
mcimadamore@160 | 1299 | steps = steps.tail; |
duke@1 | 1300 | } |
mcimadamore@160 | 1301 | if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error |
mcimadamore@160 | 1302 | MethodResolutionPhase errPhase = firstErroneousResolutionPhase(); |
mcimadamore@160 | 1303 | sym = access(methodResolutionCache.get(errPhase), |
mcimadamore@160 | 1304 | pos, site, names.init, true, argtypes, typeargtypes); |
mcimadamore@160 | 1305 | env.info.varArgs = errPhase.isVarargsRequired(); |
duke@1 | 1306 | } |
duke@1 | 1307 | return sym; |
duke@1 | 1308 | } |
duke@1 | 1309 | |
duke@1 | 1310 | /** Resolve constructor. |
duke@1 | 1311 | * @param pos The position to use for error reporting. |
duke@1 | 1312 | * @param env The environment current at the constructor invocation. |
duke@1 | 1313 | * @param site The type of class for which a constructor is searched. |
duke@1 | 1314 | * @param argtypes The types of the constructor invocation's value |
duke@1 | 1315 | * arguments. |
duke@1 | 1316 | * @param typeargtypes The types of the constructor invocation's type |
duke@1 | 1317 | * arguments. |
duke@1 | 1318 | * @param allowBoxing Allow boxing and varargs conversions. |
duke@1 | 1319 | * @param useVarargs Box trailing arguments into an array for varargs. |
duke@1 | 1320 | */ |
duke@1 | 1321 | Symbol resolveConstructor(DiagnosticPosition pos, Env<AttrContext> env, |
duke@1 | 1322 | Type site, List<Type> argtypes, |
duke@1 | 1323 | List<Type> typeargtypes, |
duke@1 | 1324 | boolean allowBoxing, |
duke@1 | 1325 | boolean useVarargs) { |
duke@1 | 1326 | Symbol sym = findMethod(env, site, |
duke@1 | 1327 | names.init, argtypes, |
duke@1 | 1328 | typeargtypes, allowBoxing, |
duke@1 | 1329 | useVarargs, false); |
duke@1 | 1330 | if ((sym.flags() & DEPRECATED) != 0 && |
duke@1 | 1331 | (env.info.scope.owner.flags() & DEPRECATED) == 0 && |
duke@1 | 1332 | env.info.scope.owner.outermostClass() != sym.outermostClass()) |
duke@1 | 1333 | chk.warnDeprecated(pos, sym); |
duke@1 | 1334 | return sym; |
duke@1 | 1335 | } |
duke@1 | 1336 | |
duke@1 | 1337 | /** Resolve a constructor, throw a fatal error if not found. |
duke@1 | 1338 | * @param pos The position to use for error reporting. |
duke@1 | 1339 | * @param env The environment current at the method invocation. |
duke@1 | 1340 | * @param site The type to be constructed. |
duke@1 | 1341 | * @param argtypes The types of the invocation's value arguments. |
duke@1 | 1342 | * @param typeargtypes The types of the invocation's type arguments. |
duke@1 | 1343 | */ |
duke@1 | 1344 | public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env, |
duke@1 | 1345 | Type site, |
duke@1 | 1346 | List<Type> argtypes, |
duke@1 | 1347 | List<Type> typeargtypes) { |
duke@1 | 1348 | Symbol sym = resolveConstructor( |
duke@1 | 1349 | pos, env, site, argtypes, typeargtypes); |
duke@1 | 1350 | if (sym.kind == MTH) return (MethodSymbol)sym; |
duke@1 | 1351 | else throw new FatalError( |
mcimadamore@89 | 1352 | diags.fragment("fatal.err.cant.locate.ctor", site)); |
duke@1 | 1353 | } |
duke@1 | 1354 | |
duke@1 | 1355 | /** Resolve operator. |
duke@1 | 1356 | * @param pos The position to use for error reporting. |
duke@1 | 1357 | * @param optag The tag of the operation tree. |
duke@1 | 1358 | * @param env The environment current at the operation. |
duke@1 | 1359 | * @param argtypes The types of the operands. |
duke@1 | 1360 | */ |
duke@1 | 1361 | Symbol resolveOperator(DiagnosticPosition pos, int optag, |
duke@1 | 1362 | Env<AttrContext> env, List<Type> argtypes) { |
duke@1 | 1363 | Name name = treeinfo.operatorName(optag); |
duke@1 | 1364 | Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes, |
duke@1 | 1365 | null, false, false, true); |
duke@1 | 1366 | if (boxingEnabled && sym.kind >= WRONG_MTHS) |
duke@1 | 1367 | sym = findMethod(env, syms.predefClass.type, name, argtypes, |
duke@1 | 1368 | null, true, false, true); |
duke@1 | 1369 | return access(sym, pos, env.enclClass.sym.type, name, |
duke@1 | 1370 | false, argtypes, null); |
duke@1 | 1371 | } |
duke@1 | 1372 | |
duke@1 | 1373 | /** Resolve operator. |
duke@1 | 1374 | * @param pos The position to use for error reporting. |
duke@1 | 1375 | * @param optag The tag of the operation tree. |
duke@1 | 1376 | * @param env The environment current at the operation. |
duke@1 | 1377 | * @param arg The type of the operand. |
duke@1 | 1378 | */ |
duke@1 | 1379 | Symbol resolveUnaryOperator(DiagnosticPosition pos, int optag, Env<AttrContext> env, Type arg) { |
duke@1 | 1380 | return resolveOperator(pos, optag, env, List.of(arg)); |
duke@1 | 1381 | } |
duke@1 | 1382 | |
duke@1 | 1383 | /** Resolve binary operator. |
duke@1 | 1384 | * @param pos The position to use for error reporting. |
duke@1 | 1385 | * @param optag The tag of the operation tree. |
duke@1 | 1386 | * @param env The environment current at the operation. |
duke@1 | 1387 | * @param left The types of the left operand. |
duke@1 | 1388 | * @param right The types of the right operand. |
duke@1 | 1389 | */ |
duke@1 | 1390 | Symbol resolveBinaryOperator(DiagnosticPosition pos, |
duke@1 | 1391 | int optag, |
duke@1 | 1392 | Env<AttrContext> env, |
duke@1 | 1393 | Type left, |
duke@1 | 1394 | Type right) { |
duke@1 | 1395 | return resolveOperator(pos, optag, env, List.of(left, right)); |
duke@1 | 1396 | } |
duke@1 | 1397 | |
duke@1 | 1398 | /** |
duke@1 | 1399 | * Resolve `c.name' where name == this or name == super. |
duke@1 | 1400 | * @param pos The position to use for error reporting. |
duke@1 | 1401 | * @param env The environment current at the expression. |
duke@1 | 1402 | * @param c The qualifier. |
duke@1 | 1403 | * @param name The identifier's name. |
duke@1 | 1404 | */ |
duke@1 | 1405 | Symbol resolveSelf(DiagnosticPosition pos, |
duke@1 | 1406 | Env<AttrContext> env, |
duke@1 | 1407 | TypeSymbol c, |
duke@1 | 1408 | Name name) { |
duke@1 | 1409 | Env<AttrContext> env1 = env; |
duke@1 | 1410 | boolean staticOnly = false; |
duke@1 | 1411 | while (env1.outer != null) { |
duke@1 | 1412 | if (isStatic(env1)) staticOnly = true; |
duke@1 | 1413 | if (env1.enclClass.sym == c) { |
duke@1 | 1414 | Symbol sym = env1.info.scope.lookup(name).sym; |
duke@1 | 1415 | if (sym != null) { |
duke@1 | 1416 | if (staticOnly) sym = new StaticError(sym); |
duke@1 | 1417 | return access(sym, pos, env.enclClass.sym.type, |
duke@1 | 1418 | name, true); |
duke@1 | 1419 | } |
duke@1 | 1420 | } |
duke@1 | 1421 | if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true; |
duke@1 | 1422 | env1 = env1.outer; |
duke@1 | 1423 | } |
duke@1 | 1424 | log.error(pos, "not.encl.class", c); |
duke@1 | 1425 | return syms.errSymbol; |
duke@1 | 1426 | } |
duke@1 | 1427 | |
duke@1 | 1428 | /** |
duke@1 | 1429 | * Resolve `c.this' for an enclosing class c that contains the |
duke@1 | 1430 | * named member. |
duke@1 | 1431 | * @param pos The position to use for error reporting. |
duke@1 | 1432 | * @param env The environment current at the expression. |
duke@1 | 1433 | * @param member The member that must be contained in the result. |
duke@1 | 1434 | */ |
duke@1 | 1435 | Symbol resolveSelfContaining(DiagnosticPosition pos, |
duke@1 | 1436 | Env<AttrContext> env, |
duke@1 | 1437 | Symbol member) { |
duke@1 | 1438 | Name name = names._this; |
duke@1 | 1439 | Env<AttrContext> env1 = env; |
duke@1 | 1440 | boolean staticOnly = false; |
duke@1 | 1441 | while (env1.outer != null) { |
duke@1 | 1442 | if (isStatic(env1)) staticOnly = true; |
duke@1 | 1443 | if (env1.enclClass.sym.isSubClass(member.owner, types) && |
duke@1 | 1444 | isAccessible(env, env1.enclClass.sym.type, member)) { |
duke@1 | 1445 | Symbol sym = env1.info.scope.lookup(name).sym; |
duke@1 | 1446 | if (sym != null) { |
duke@1 | 1447 | if (staticOnly) sym = new StaticError(sym); |
duke@1 | 1448 | return access(sym, pos, env.enclClass.sym.type, |
duke@1 | 1449 | name, true); |
duke@1 | 1450 | } |
duke@1 | 1451 | } |
duke@1 | 1452 | if ((env1.enclClass.sym.flags() & STATIC) != 0) |
duke@1 | 1453 | staticOnly = true; |
duke@1 | 1454 | env1 = env1.outer; |
duke@1 | 1455 | } |
duke@1 | 1456 | log.error(pos, "encl.class.required", member); |
duke@1 | 1457 | return syms.errSymbol; |
duke@1 | 1458 | } |
duke@1 | 1459 | |
duke@1 | 1460 | /** |
duke@1 | 1461 | * Resolve an appropriate implicit this instance for t's container. |
duke@1 | 1462 | * JLS2 8.8.5.1 and 15.9.2 |
duke@1 | 1463 | */ |
duke@1 | 1464 | Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) { |
duke@1 | 1465 | Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0) |
duke@1 | 1466 | ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this) |
duke@1 | 1467 | : resolveSelfContaining(pos, env, t.tsym)).type; |
duke@1 | 1468 | if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym) |
duke@1 | 1469 | log.error(pos, "cant.ref.before.ctor.called", "this"); |
duke@1 | 1470 | return thisType; |
duke@1 | 1471 | } |
duke@1 | 1472 | |
duke@1 | 1473 | /* *************************************************************************** |
duke@1 | 1474 | * ResolveError classes, indicating error situations when accessing symbols |
duke@1 | 1475 | ****************************************************************************/ |
duke@1 | 1476 | |
duke@1 | 1477 | public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) { |
duke@1 | 1478 | AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym); |
duke@1 | 1479 | error.report(log, tree.pos(), type.getEnclosingType(), null, null, null); |
duke@1 | 1480 | } |
duke@1 | 1481 | |
mcimadamore@161 | 1482 | private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args"); |
mcimadamore@161 | 1483 | |
mcimadamore@161 | 1484 | public Object methodArguments(List<Type> argtypes) { |
mcimadamore@161 | 1485 | return argtypes.isEmpty() ? noArgs : argtypes; |
mcimadamore@161 | 1486 | } |
mcimadamore@161 | 1487 | |
duke@1 | 1488 | /** Root class for resolve errors. |
duke@1 | 1489 | * Instances of this class indicate "Symbol not found". |
duke@1 | 1490 | * Instances of subclass indicate other errors. |
duke@1 | 1491 | */ |
duke@1 | 1492 | private class ResolveError extends Symbol { |
duke@1 | 1493 | |
duke@1 | 1494 | ResolveError(int kind, Symbol sym, String debugName) { |
duke@1 | 1495 | super(kind, 0, null, null, null); |
duke@1 | 1496 | this.debugName = debugName; |
duke@1 | 1497 | this.sym = sym; |
duke@1 | 1498 | } |
duke@1 | 1499 | |
duke@1 | 1500 | /** The name of the kind of error, for debugging only. |
duke@1 | 1501 | */ |
duke@1 | 1502 | final String debugName; |
duke@1 | 1503 | |
duke@1 | 1504 | /** The symbol that was determined by resolution, or errSymbol if none |
duke@1 | 1505 | * was found. |
duke@1 | 1506 | */ |
duke@1 | 1507 | final Symbol sym; |
duke@1 | 1508 | |
duke@1 | 1509 | /** The symbol that was a close mismatch, or null if none was found. |
duke@1 | 1510 | * wrongSym is currently set if a simgle method with the correct name, but |
duke@1 | 1511 | * the wrong parameters was found. |
duke@1 | 1512 | */ |
duke@1 | 1513 | Symbol wrongSym; |
duke@1 | 1514 | |
duke@1 | 1515 | /** An auxiliary explanation set in case of instantiation errors. |
duke@1 | 1516 | */ |
duke@1 | 1517 | JCDiagnostic explanation; |
duke@1 | 1518 | |
duke@1 | 1519 | |
duke@1 | 1520 | public <R, P> R accept(ElementVisitor<R, P> v, P p) { |
duke@1 | 1521 | throw new AssertionError(); |
duke@1 | 1522 | } |
duke@1 | 1523 | |
duke@1 | 1524 | /** Print the (debug only) name of the kind of error. |
duke@1 | 1525 | */ |
duke@1 | 1526 | public String toString() { |
duke@1 | 1527 | return debugName + " wrongSym=" + wrongSym + " explanation=" + explanation; |
duke@1 | 1528 | } |
duke@1 | 1529 | |
duke@1 | 1530 | /** Update wrongSym and explanation and return this. |
duke@1 | 1531 | */ |
duke@1 | 1532 | ResolveError setWrongSym(Symbol sym, JCDiagnostic explanation) { |
duke@1 | 1533 | this.wrongSym = sym; |
duke@1 | 1534 | this.explanation = explanation; |
duke@1 | 1535 | return this; |
duke@1 | 1536 | } |
duke@1 | 1537 | |
duke@1 | 1538 | /** Update wrongSym and return this. |
duke@1 | 1539 | */ |
duke@1 | 1540 | ResolveError setWrongSym(Symbol sym) { |
duke@1 | 1541 | this.wrongSym = sym; |
duke@1 | 1542 | this.explanation = null; |
duke@1 | 1543 | return this; |
duke@1 | 1544 | } |
duke@1 | 1545 | |
duke@1 | 1546 | public boolean exists() { |
duke@1 | 1547 | switch (kind) { |
duke@1 | 1548 | case HIDDEN: |
duke@1 | 1549 | case ABSENT_VAR: |
duke@1 | 1550 | case ABSENT_MTH: |
duke@1 | 1551 | case ABSENT_TYP: |
duke@1 | 1552 | return false; |
duke@1 | 1553 | default: |
duke@1 | 1554 | return true; |
duke@1 | 1555 | } |
duke@1 | 1556 | } |
duke@1 | 1557 | |
duke@1 | 1558 | /** Report error. |
duke@1 | 1559 | * @param log The error log to be used for error reporting. |
duke@1 | 1560 | * @param pos The position to be used for error reporting. |
duke@1 | 1561 | * @param site The original type from where the selection took place. |
duke@1 | 1562 | * @param name The name of the symbol to be resolved. |
duke@1 | 1563 | * @param argtypes The invocation's value arguments, |
duke@1 | 1564 | * if we looked for a method. |
duke@1 | 1565 | * @param typeargtypes The invocation's type arguments, |
duke@1 | 1566 | * if we looked for a method. |
duke@1 | 1567 | */ |
duke@1 | 1568 | void report(Log log, DiagnosticPosition pos, Type site, Name name, |
duke@1 | 1569 | List<Type> argtypes, List<Type> typeargtypes) { |
mcimadamore@80 | 1570 | if (argtypes == null) |
mcimadamore@80 | 1571 | argtypes = List.nil(); |
mcimadamore@80 | 1572 | if (typeargtypes == null) |
mcimadamore@80 | 1573 | typeargtypes = List.nil(); |
jjg@113 | 1574 | if (name != names.error) { |
mcimadamore@80 | 1575 | KindName kindname = absentKind(kind); |
mcimadamore@80 | 1576 | Name idname = name; |
duke@1 | 1577 | if (kind >= WRONG_MTHS && kind <= ABSENT_MTH) { |
duke@1 | 1578 | if (isOperator(name)) { |
duke@1 | 1579 | log.error(pos, "operator.cant.be.applied", |
mcimadamore@80 | 1580 | name, argtypes); |
duke@1 | 1581 | return; |
duke@1 | 1582 | } |
jjg@113 | 1583 | if (name == names.init) { |
mcimadamore@80 | 1584 | kindname = KindName.CONSTRUCTOR; |
mcimadamore@80 | 1585 | idname = site.tsym.name; |
duke@1 | 1586 | } |
duke@1 | 1587 | } |
duke@1 | 1588 | if (kind == WRONG_MTH) { |
mcimadamore@80 | 1589 | Symbol ws = wrongSym.asMemberOf(site, types); |
duke@1 | 1590 | log.error(pos, |
duke@1 | 1591 | "cant.apply.symbol" + (explanation != null ? ".1" : ""), |
mcimadamore@80 | 1592 | kindname, |
mcimadamore@80 | 1593 | ws.name == names.init ? ws.owner.name : ws.name, |
mcimadamore@161 | 1594 | methodArguments(ws.type.getParameterTypes()), |
mcimadamore@161 | 1595 | methodArguments(argtypes), |
mcimadamore@80 | 1596 | kindName(ws.owner), |
mcimadamore@80 | 1597 | ws.owner.type, |
duke@1 | 1598 | explanation); |
jjg@113 | 1599 | } else if (!site.tsym.name.isEmpty()) { |
duke@1 | 1600 | if (site.tsym.kind == PCK && !site.tsym.exists()) |
duke@1 | 1601 | log.error(pos, "doesnt.exist", site.tsym); |
mcimadamore@80 | 1602 | else { |
mcimadamore@80 | 1603 | String errKey = getErrorKey("cant.resolve.location", |
mcimadamore@80 | 1604 | argtypes, typeargtypes, |
mcimadamore@80 | 1605 | kindname); |
mcimadamore@80 | 1606 | log.error(pos, errKey, kindname, idname, //symbol kindname, name |
mcimadamore@80 | 1607 | typeargtypes, argtypes, //type parameters and arguments (if any) |
mcimadamore@80 | 1608 | typeKindName(site), site); //location kindname, type |
mcimadamore@80 | 1609 | } |
duke@1 | 1610 | } else { |
mcimadamore@80 | 1611 | String errKey = getErrorKey("cant.resolve", |
mcimadamore@80 | 1612 | argtypes, typeargtypes, |
mcimadamore@80 | 1613 | kindname); |
mcimadamore@80 | 1614 | log.error(pos, errKey, kindname, idname, //symbol kindname, name |
mcimadamore@80 | 1615 | typeargtypes, argtypes); //type parameters and arguments (if any) |
duke@1 | 1616 | } |
duke@1 | 1617 | } |
duke@1 | 1618 | } |
mcimadamore@80 | 1619 | //where |
mcimadamore@80 | 1620 | String getErrorKey(String key, List<Type> argtypes, List<Type> typeargtypes, KindName kindname) { |
mcimadamore@80 | 1621 | String suffix = ""; |
mcimadamore@80 | 1622 | switch (kindname) { |
mcimadamore@80 | 1623 | case METHOD: |
mcimadamore@80 | 1624 | case CONSTRUCTOR: { |
mcimadamore@80 | 1625 | suffix += ".args"; |
mcimadamore@80 | 1626 | suffix += typeargtypes.nonEmpty() ? ".params" : ""; |
mcimadamore@80 | 1627 | } |
duke@1 | 1628 | } |
mcimadamore@80 | 1629 | return key + suffix; |
mcimadamore@80 | 1630 | } |
mcimadamore@80 | 1631 | |
mcimadamore@80 | 1632 | /** A name designates an operator if it consists |
mcimadamore@80 | 1633 | * of a non-empty sequence of operator symbols +-~!/*%&|^<>= |
mcimadamore@80 | 1634 | */ |
mcimadamore@80 | 1635 | boolean isOperator(Name name) { |
mcimadamore@80 | 1636 | int i = 0; |
jjg@113 | 1637 | while (i < name.getByteLength() && |
jjg@113 | 1638 | "+-~!*/%&|^<>=".indexOf(name.getByteAt(i)) >= 0) i++; |
jjg@113 | 1639 | return i > 0 && i == name.getByteLength(); |
mcimadamore@80 | 1640 | } |
duke@1 | 1641 | } |
duke@1 | 1642 | |
duke@1 | 1643 | /** Resolve error class indicating that a symbol is not accessible. |
duke@1 | 1644 | */ |
duke@1 | 1645 | class AccessError extends ResolveError { |
duke@1 | 1646 | |
duke@1 | 1647 | AccessError(Symbol sym) { |
duke@1 | 1648 | this(null, null, sym); |
duke@1 | 1649 | } |
duke@1 | 1650 | |
duke@1 | 1651 | AccessError(Env<AttrContext> env, Type site, Symbol sym) { |
duke@1 | 1652 | super(HIDDEN, sym, "access error"); |
duke@1 | 1653 | this.env = env; |
duke@1 | 1654 | this.site = site; |
duke@1 | 1655 | if (debugResolve) |
duke@1 | 1656 | log.error("proc.messager", sym + " @ " + site + " is inaccessible."); |
duke@1 | 1657 | } |
duke@1 | 1658 | |
duke@1 | 1659 | private Env<AttrContext> env; |
duke@1 | 1660 | private Type site; |
duke@1 | 1661 | |
duke@1 | 1662 | /** Report error. |
duke@1 | 1663 | * @param log The error log to be used for error reporting. |
duke@1 | 1664 | * @param pos The position to be used for error reporting. |
duke@1 | 1665 | * @param site The original type from where the selection took place. |
duke@1 | 1666 | * @param name The name of the symbol to be resolved. |
duke@1 | 1667 | * @param argtypes The invocation's value arguments, |
duke@1 | 1668 | * if we looked for a method. |
duke@1 | 1669 | * @param typeargtypes The invocation's type arguments, |
duke@1 | 1670 | * if we looked for a method. |
duke@1 | 1671 | */ |
duke@1 | 1672 | void report(Log log, DiagnosticPosition pos, Type site, Name name, |
duke@1 | 1673 | List<Type> argtypes, List<Type> typeargtypes) { |
duke@1 | 1674 | if (sym.owner.type.tag != ERROR) { |
jjg@113 | 1675 | if (sym.name == names.init && sym.owner != site.tsym) |
duke@1 | 1676 | new ResolveError(ABSENT_MTH, sym.owner, "absent method " + sym).report( |
duke@1 | 1677 | log, pos, site, name, argtypes, typeargtypes); |
duke@1 | 1678 | if ((sym.flags() & PUBLIC) != 0 |
duke@1 | 1679 | || (env != null && this.site != null |
duke@1 | 1680 | && !isAccessible(env, this.site))) |
duke@1 | 1681 | log.error(pos, "not.def.access.class.intf.cant.access", |
duke@1 | 1682 | sym, sym.location()); |
duke@1 | 1683 | else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) |
duke@1 | 1684 | log.error(pos, "report.access", sym, |
mcimadamore@80 | 1685 | asFlagSet(sym.flags() & (PRIVATE | PROTECTED)), |
duke@1 | 1686 | sym.location()); |
duke@1 | 1687 | else |
duke@1 | 1688 | log.error(pos, "not.def.public.cant.access", |
duke@1 | 1689 | sym, sym.location()); |
duke@1 | 1690 | } |
duke@1 | 1691 | } |
duke@1 | 1692 | } |
duke@1 | 1693 | |
duke@1 | 1694 | /** Resolve error class indicating that an instance member was accessed |
duke@1 | 1695 | * from a static context. |
duke@1 | 1696 | */ |
duke@1 | 1697 | class StaticError extends ResolveError { |
duke@1 | 1698 | StaticError(Symbol sym) { |
duke@1 | 1699 | super(STATICERR, sym, "static error"); |
duke@1 | 1700 | } |
duke@1 | 1701 | |
duke@1 | 1702 | /** Report error. |
duke@1 | 1703 | * @param log The error log to be used for error reporting. |
duke@1 | 1704 | * @param pos The position to be used for error reporting. |
duke@1 | 1705 | * @param site The original type from where the selection took place. |
duke@1 | 1706 | * @param name The name of the symbol to be resolved. |
duke@1 | 1707 | * @param argtypes The invocation's value arguments, |
duke@1 | 1708 | * if we looked for a method. |
duke@1 | 1709 | * @param typeargtypes The invocation's type arguments, |
duke@1 | 1710 | * if we looked for a method. |
duke@1 | 1711 | */ |
duke@1 | 1712 | void report(Log log, |
duke@1 | 1713 | DiagnosticPosition pos, |
duke@1 | 1714 | Type site, |
duke@1 | 1715 | Name name, |
duke@1 | 1716 | List<Type> argtypes, |
duke@1 | 1717 | List<Type> typeargtypes) { |
mcimadamore@80 | 1718 | Symbol errSym = ((sym.kind == TYP && sym.type.tag == CLASS) |
mcimadamore@80 | 1719 | ? types.erasure(sym.type).tsym |
mcimadamore@80 | 1720 | : sym); |
duke@1 | 1721 | log.error(pos, "non-static.cant.be.ref", |
mcimadamore@80 | 1722 | kindName(sym), errSym); |
duke@1 | 1723 | } |
duke@1 | 1724 | } |
duke@1 | 1725 | |
duke@1 | 1726 | /** Resolve error class indicating an ambiguous reference. |
duke@1 | 1727 | */ |
duke@1 | 1728 | class AmbiguityError extends ResolveError { |
duke@1 | 1729 | Symbol sym1; |
duke@1 | 1730 | Symbol sym2; |
duke@1 | 1731 | |
duke@1 | 1732 | AmbiguityError(Symbol sym1, Symbol sym2) { |
duke@1 | 1733 | super(AMBIGUOUS, sym1, "ambiguity error"); |
duke@1 | 1734 | this.sym1 = sym1; |
duke@1 | 1735 | this.sym2 = sym2; |
duke@1 | 1736 | } |
duke@1 | 1737 | |
duke@1 | 1738 | /** Report error. |
duke@1 | 1739 | * @param log The error log to be used for error reporting. |
duke@1 | 1740 | * @param pos The position to be used for error reporting. |
duke@1 | 1741 | * @param site The original type from where the selection took place. |
duke@1 | 1742 | * @param name The name of the symbol to be resolved. |
duke@1 | 1743 | * @param argtypes The invocation's value arguments, |
duke@1 | 1744 | * if we looked for a method. |
duke@1 | 1745 | * @param typeargtypes The invocation's type arguments, |
duke@1 | 1746 | * if we looked for a method. |
duke@1 | 1747 | */ |
duke@1 | 1748 | void report(Log log, DiagnosticPosition pos, Type site, Name name, |
duke@1 | 1749 | List<Type> argtypes, List<Type> typeargtypes) { |
duke@1 | 1750 | AmbiguityError pair = this; |
duke@1 | 1751 | while (true) { |
duke@1 | 1752 | if (pair.sym1.kind == AMBIGUOUS) |
duke@1 | 1753 | pair = (AmbiguityError)pair.sym1; |
duke@1 | 1754 | else if (pair.sym2.kind == AMBIGUOUS) |
duke@1 | 1755 | pair = (AmbiguityError)pair.sym2; |
duke@1 | 1756 | else break; |
duke@1 | 1757 | } |
duke@1 | 1758 | Name sname = pair.sym1.name; |
jjg@113 | 1759 | if (sname == names.init) sname = pair.sym1.owner.name; |
duke@1 | 1760 | log.error(pos, "ref.ambiguous", sname, |
duke@1 | 1761 | kindName(pair.sym1), |
duke@1 | 1762 | pair.sym1, |
duke@1 | 1763 | pair.sym1.location(site, types), |
duke@1 | 1764 | kindName(pair.sym2), |
duke@1 | 1765 | pair.sym2, |
duke@1 | 1766 | pair.sym2.location(site, types)); |
duke@1 | 1767 | } |
duke@1 | 1768 | } |
mcimadamore@160 | 1769 | |
mcimadamore@160 | 1770 | enum MethodResolutionPhase { |
mcimadamore@160 | 1771 | BASIC(false, false), |
mcimadamore@160 | 1772 | BOX(true, false), |
mcimadamore@160 | 1773 | VARARITY(true, true); |
mcimadamore@160 | 1774 | |
mcimadamore@160 | 1775 | boolean isBoxingRequired; |
mcimadamore@160 | 1776 | boolean isVarargsRequired; |
mcimadamore@160 | 1777 | |
mcimadamore@160 | 1778 | MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) { |
mcimadamore@160 | 1779 | this.isBoxingRequired = isBoxingRequired; |
mcimadamore@160 | 1780 | this.isVarargsRequired = isVarargsRequired; |
mcimadamore@160 | 1781 | } |
mcimadamore@160 | 1782 | |
mcimadamore@160 | 1783 | public boolean isBoxingRequired() { |
mcimadamore@160 | 1784 | return isBoxingRequired; |
mcimadamore@160 | 1785 | } |
mcimadamore@160 | 1786 | |
mcimadamore@160 | 1787 | public boolean isVarargsRequired() { |
mcimadamore@160 | 1788 | return isVarargsRequired; |
mcimadamore@160 | 1789 | } |
mcimadamore@160 | 1790 | |
mcimadamore@160 | 1791 | public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) { |
mcimadamore@160 | 1792 | return (varargsEnabled || !isVarargsRequired) && |
mcimadamore@160 | 1793 | (boxingEnabled || !isBoxingRequired); |
mcimadamore@160 | 1794 | } |
mcimadamore@160 | 1795 | } |
mcimadamore@160 | 1796 | |
mcimadamore@160 | 1797 | private Map<MethodResolutionPhase, Symbol> methodResolutionCache = |
mcimadamore@160 | 1798 | new HashMap<MethodResolutionPhase, Symbol>(MethodResolutionPhase.values().length); |
mcimadamore@160 | 1799 | |
mcimadamore@160 | 1800 | final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY); |
mcimadamore@160 | 1801 | |
mcimadamore@160 | 1802 | private MethodResolutionPhase firstErroneousResolutionPhase() { |
mcimadamore@160 | 1803 | MethodResolutionPhase bestSoFar = BASIC; |
mcimadamore@160 | 1804 | Symbol sym = methodNotFound; |
mcimadamore@160 | 1805 | List<MethodResolutionPhase> steps = methodResolutionSteps; |
mcimadamore@160 | 1806 | while (steps.nonEmpty() && |
mcimadamore@160 | 1807 | steps.head.isApplicable(boxingEnabled, varargsEnabled) && |
mcimadamore@160 | 1808 | sym.kind >= WRONG_MTHS) { |
mcimadamore@160 | 1809 | sym = methodResolutionCache.get(steps.head); |
mcimadamore@160 | 1810 | bestSoFar = steps.head; |
mcimadamore@160 | 1811 | steps = steps.tail; |
mcimadamore@160 | 1812 | } |
mcimadamore@160 | 1813 | return bestSoFar; |
mcimadamore@160 | 1814 | } |
duke@1 | 1815 | } |