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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.tools.tree; | ||
| 27 | |||
| 28 | import sun.tools.java.*; | ||
| 29 | import sun.tools.asm.Assembler; | ||
| 30 | |||
| 31 | /** | ||
| 32 | * WARNING: The contents of this source file are not part of any | ||
| 33 | * supported API. Code that depends on them does so at its own risk: | ||
| 34 | * they are subject to change or removal without notice. | ||
| 35 | */ | ||
| 36 | public | ||
| 37 | class Context implements Constants { | ||
| 38 | Context prev; | ||
| 39 | Node node; | ||
| 40 | int varNumber; | ||
| 41 | LocalMember locals; | ||
| 42 | LocalMember classes; | ||
| 43 | MemberDefinition field; | ||
| 44 | int scopeNumber; | ||
| 45 | int frameNumber; | ||
| 46 | |||
| 47 | /** | ||
| 48 | * Create the initial context for a method | ||
| 49 | * The incoming context is inherited from | ||
| 50 | */ | ||
| 51 | public Context(Context ctx, MemberDefinition field) { | ||
| 52 | this.field = field; | ||
| 53 | if (ctx == null) { | ||
| 54 | this.frameNumber = 1; | ||
| 55 | this.scopeNumber = 2; | ||
| 56 | this.varNumber = 0; | ||
| 57 | } else { | ||
| 58 | this.prev = ctx; | ||
| 59 | this.locals = ctx.locals; | ||
| 60 | this.classes = ctx.classes; | ||
| 61 | if (field != null && | ||
| 62 | (field.isVariable() || field.isInitializer())) { | ||
| 63 | // Variables and initializers are inlined into a constructor. | ||
| 64 | // Model this by inheriting the frame number of the parent, | ||
| 65 | // which will contain a "this" parameter. | ||
| 66 | this.frameNumber = ctx.frameNumber; | ||
| 67 | this.scopeNumber = ctx.scopeNumber + 1; | ||
| 68 | } else { | ||
| 69 | this.frameNumber = ctx.scopeNumber + 1; | ||
| 70 | this.scopeNumber = this.frameNumber + 1; | ||
| 71 | } | ||
| 72 | this.varNumber = ctx.varNumber; | ||
| 73 | } | ||
| 74 | } | ||
| 75 | |||
| 76 | /** | ||
| 77 | * Create a new context, for initializing a class. | ||
| 78 | */ | ||
| 79 | public Context(Context ctx, ClassDefinition c) { | ||
| 80 | this(ctx, (MemberDefinition)null); | ||
| 81 | } | ||
| 82 | |||
| 83 | /** | ||
| 84 | * Create a new nested context, for a block statement | ||
| 85 | */ | ||
| 86 | Context(Context ctx, Node node) { | ||
| 87 | if (ctx == null) { | ||
| 88 | this.frameNumber = 1; | ||
| 89 | this.scopeNumber = 2; | ||
| 90 | this.varNumber = 0; | ||
| 91 | } else { | ||
| 92 | this.prev = ctx; | ||
| 93 | this.locals = ctx.locals; | ||
| 94 | // Inherit local classes from surrounding block, | ||
| 95 | // just as for local variables. Fixes 4074421. | ||
| 96 | this.classes = ctx.classes; | ||
| 97 | this.varNumber = ctx.varNumber; | ||
| 98 | this.field = ctx.field; | ||
| 99 | this.frameNumber = ctx.frameNumber; | ||
| 100 | this.scopeNumber = ctx.scopeNumber + 1; | ||
| 101 | this.node = node; | ||
| 102 | } | ||
| 103 | } | ||
| 104 | |||
| 105 | public Context(Context ctx) { | ||
| 106 | this(ctx, (Node)null); | ||
| 107 | } | ||
| 108 | |||
| 109 | /** | ||
| 110 | * Declare local | ||
| 111 | */ | ||
| 112 | public int declare(Environment env, LocalMember local) { | ||
| 113 | //System.out.println( "DECLARE= " + local.getName() + "=" + varNumber + ", read=" + local.readcount + ", write=" + local.writecount + ", hash=" + local.hashCode()); | ||
| 114 | local.scopeNumber = scopeNumber; | ||
| 115 | if (this.field == null && idThis.equals(local.getName())) { | ||
| 116 | local.scopeNumber += 1; // Anticipate variable or initializer. | ||
| 117 | } | ||
| 118 | if (local.isInnerClass()) { | ||
| 119 | local.prev = classes; | ||
| 120 | classes = local; | ||
| 121 | return 0; | ||
| 122 | } | ||
| 123 | |||
| 124 | // Originally the statement: | ||
| 125 | // | ||
| 126 | // local.subModifiers(M_INLINEABLE); | ||
| 127 | // | ||
| 128 | // was here with the comment: | ||
| 129 | // | ||
| 130 | // // prevent inlining across call sites | ||
| 131 | // | ||
| 132 | // This statement prevented constant local variables from | ||
| 133 | // inlining. It didn't seem to do anything useful. | ||
| 134 | // | ||
| 135 | // The statement has been removed and an assertion has been | ||
| 136 | // added which mandates that the only members which are marked | ||
| 137 | // with M_INLINEABLE are the ones for which isConstant() is true. | ||
| 138 | // (Fix for 4106244.) | ||
| 139 | // | ||
| 140 | // Addition to the above comment: they might also be | ||
| 141 | // final variables initialized with 'this', 'super', or other | ||
| 142 | // final identifiers. See VarDeclarationStatement.inline(). | ||
| 143 | // So I've removed the assertion. The original subModifiers | ||
| 144 | // call appears to have been there to fix nested class translation | ||
| 145 | // breakage, which has been fixed in VarDeclarationStatement | ||
| 146 | // now instead. (Fix for 4073244.) | ||
| 147 | |||
| 148 | local.prev = locals; | ||
| 149 | locals = local; | ||
| 150 | local.number = varNumber; | ||
| 151 | varNumber += local.getType().stackSize(); | ||
| 152 | return local.number; | ||
| 153 | } | ||
| 154 | |||
| 155 | /** | ||
| 156 | * Get a local variable by name | ||
| 157 | */ | ||
| 158 | public | ||
| 159 | LocalMember getLocalField(Identifier name) { | ||
| 160 | for (LocalMember f = locals ; f != null ; f = f.prev) { | ||
| 161 | if (name.equals(f.getName())) { | ||
| 162 | return f; | ||
| 163 | } | ||
| 164 | } | ||
| 165 | return null; | ||
| 166 | } | ||
| 167 | |||
| 168 | /** | ||
| 169 | * Get the scope number for a reference to a member of this class | ||
| 170 | * (Larger scope numbers are more deeply nested.) | ||
| 171 | * @see LocalMember#scopeNumber | ||
| 172 | */ | ||
| 173 | public | ||
| 174 | int getScopeNumber(ClassDefinition c) { | ||
| 175 | for (Context ctx = this; ctx != null; ctx = ctx.prev) { | ||
| 176 | if (ctx.field == null) continue; | ||
| 177 | if (ctx.field.getClassDefinition() == c) { | ||
| 178 | return ctx.frameNumber; | ||
| 179 | } | ||
| 180 | } | ||
| 181 | return -1; | ||
| 182 | } | ||
| 183 | |||
| 184 | private | ||
| 185 | MemberDefinition getFieldCommon(Environment env, Identifier name, | ||
| 186 | boolean apparentOnly) throws AmbiguousMember, ClassNotFound { | ||
| 187 | // Note: This is structured as a pair of parallel lookups. | ||
| 188 | // If we were to redesign Context, we might prefer to walk | ||
| 189 | // along a single chain of scopes. | ||
| 190 | |||
| 191 | LocalMember lf = getLocalField(name); | ||
| 192 | int ls = (lf == null) ? -2 : lf.scopeNumber; | ||
| 193 | |||
| 194 | ClassDefinition thisClass = field.getClassDefinition(); | ||
| 195 | |||
| 196 | // Also look for a class member in a shallower scope. | ||
| 197 | for (ClassDefinition c = thisClass; | ||
| 198 | c != null; | ||
| 199 | c = c.getOuterClass()) { | ||
| 200 | MemberDefinition f = c.getVariable(env, name, thisClass); | ||
| 201 | if (f != null && getScopeNumber(c) > ls) { | ||
| 202 | if (apparentOnly && f.getClassDefinition() != c) { | ||
| 203 | continue; | ||
| 204 | } | ||
| 205 | return f; | ||
| 206 | } | ||
| 207 | } | ||
| 208 | |||
| 209 | return lf; | ||
| 210 | } | ||
| 211 | |||
| 212 | /** | ||
| 213 | * Assign a number to a class field. | ||
| 214 | * (This is used to track definite assignment of some blank finals.) | ||
| 215 | */ | ||
| 216 | public int declareFieldNumber(MemberDefinition field) { | ||
| 217 | return declare(null, new LocalMember(field)); | ||
| 218 | } | ||
| 219 | |||
| 220 | /** | ||
| 221 | * Retrieve a number previously assigned by declareMember(). | ||
| 222 | * Return -1 if there was no such assignment in this context. | ||
| 223 | */ | ||
| 224 | public int getFieldNumber(MemberDefinition field) { | ||
| 225 | for (LocalMember f = locals ; f != null ; f = f.prev) { | ||
| 226 | if (f.getMember() == field) { | ||
| 227 | return f.number; | ||
| 228 | } | ||
| 229 | } | ||
| 230 | return -1; | ||
| 231 | } | ||
| 232 | |||
| 233 | /** | ||
| 234 | * Return the local field or member field corresponding to a number. | ||
| 235 | * Return null if there is no such field. | ||
| 236 | */ | ||
| 237 | public MemberDefinition getElement(int number) { | ||
| 238 | for (LocalMember f = locals ; f != null ; f = f.prev) { | ||
| 239 | if (f.number == number) { | ||
| 240 | MemberDefinition field = f.getMember(); | ||
| 241 | return (field != null) ? field : f; | ||
| 242 | } | ||
| 243 | } | ||
| 244 | return null; | ||
| 245 | } | ||
| 246 | |||
| 247 | /** | ||
| 248 | * Get a local class by name | ||
| 249 | */ | ||
| 250 | public | ||
| 251 | LocalMember getLocalClass(Identifier name) { | ||
| 252 | for (LocalMember f = classes ; f != null ; f = f.prev) { | ||
| 253 | if (name.equals(f.getName())) { | ||
| 254 | return f; | ||
| 255 | } | ||
| 256 | } | ||
| 257 | return null; | ||
| 258 | } | ||
| 259 | |||
| 260 | private | ||
| 261 | MemberDefinition getClassCommon(Environment env, Identifier name, | ||
| 262 | boolean apparentOnly) throws ClassNotFound { | ||
| 263 | LocalMember lf = getLocalClass(name); | ||
| 264 | int ls = (lf == null) ? -2 : lf.scopeNumber; | ||
| 265 | |||
| 266 | // Also look for a class member in a shallower scope. | ||
| 267 | for (ClassDefinition c = field.getClassDefinition(); | ||
| 268 | c != null; | ||
| 269 | c = c.getOuterClass()) { | ||
| 270 | // QUERY: We may need to get the inner class from a | ||
| 271 | // superclass of 'c'. This call is prepared to | ||
| 272 | // resolve the superclass if necessary. Can we arrange | ||
| 273 | // to assure that it is always previously resolved? | ||
| 274 | // This is one of a small number of problematic calls that | ||
| 275 | // requires 'getSuperClass' to resolve superclasses on demand. | ||
| 276 | // See 'ClassDefinition.getInnerClass(env, nm)'. | ||
| 277 | MemberDefinition f = c.getInnerClass(env, name); | ||
| 278 | if (f != null && getScopeNumber(c) > ls) { | ||
| 279 | if (apparentOnly && f.getClassDefinition() != c) { | ||
| 280 | continue; | ||
| 281 | } | ||
| 282 | return f; | ||
| 283 | } | ||
| 284 | } | ||
| 285 | |||
| 286 | return lf; | ||
| 287 | } | ||
| 288 | |||
| 289 | /** | ||
| 290 | * Get either a local variable, or a field in a current class | ||
| 291 | */ | ||
| 292 | public final | ||
| 293 | MemberDefinition getField(Environment env, Identifier name) throws AmbiguousMember, ClassNotFound { | ||
| 294 | return getFieldCommon(env, name, false); | ||
| 295 | } | ||
| 296 | |||
| 297 | /** | ||
| 298 | * Like getField, except that it skips over inherited fields. | ||
| 299 | * Used for error checking. | ||
| 300 | */ | ||
| 301 | public final | ||
| 302 | MemberDefinition getApparentField(Environment env, Identifier name) throws AmbiguousMember, ClassNotFound { | ||
| 303 | return getFieldCommon(env, name, true); | ||
| 304 | } | ||
| 305 | |||
| 306 | /** | ||
| 307 | * Check if the given field is active in this context. | ||
| 308 | */ | ||
| 309 | public boolean isInScope(LocalMember field) { | ||
| 310 | for (LocalMember f = locals ; f != null ; f = f.prev) { | ||
| 311 | if (field == f) { | ||
| 312 | return true; | ||
| 313 | } | ||
| 314 | } | ||
| 315 | return false; | ||
| 316 | } | ||
| 317 | |||
| 318 | /** | ||
| 319 | * Notice a reference (usually an uplevel one). | ||
| 320 | * Update the references list of every enclosing class | ||
| 321 | * which is enclosed by the scope of the target. | ||
| 322 | * Update decisions about which uplevels to make into fields. | ||
| 323 | * Return the uplevel reference descriptor, or null if it's local. | ||
| 324 | * <p> | ||
| 325 | * The target must be in scope in this context. | ||
| 326 | * So, call this method only from the check phase. | ||
| 327 | * (In other phases, the context may be less complete.) | ||
| 328 | * <p> | ||
| 329 | * This can and should be called both before and after classes are frozen. | ||
| 330 | * It should be a no-op, and will raise a compiler error if not. | ||
| 331 | */ | ||
| 332 | public UplevelReference noteReference(Environment env, LocalMember target) { | ||
| 333 | int targetScopeNumber = !isInScope(target) ? -1 : target.scopeNumber; | ||
| 334 | |||
| 335 | // Walk outward visiting each scope. | ||
| 336 | // Note each distinct frame (i.e., enclosing method). | ||
| 337 | // For each frame in which the variable is uplevel, | ||
| 338 | // record the event in the references list of the enclosing class. | ||
| 339 | UplevelReference res = null; | ||
| 340 | int currentFrameNumber = -1; | ||
| 341 | for (Context refctx = this; refctx != null; refctx = refctx.prev) { | ||
| 342 | if (currentFrameNumber == refctx.frameNumber) { | ||
| 343 | continue; // we're processing frames, not contexts | ||
| 344 | } | ||
| 345 | currentFrameNumber = refctx.frameNumber; | ||
| 346 | if (targetScopeNumber >= currentFrameNumber) { | ||
| 347 | break; // the target is native to this frame | ||
| 348 | } | ||
| 349 | |||
| 350 | // process a frame which is using this variable as an uplevel | ||
| 351 | ClassDefinition refc = refctx.field.getClassDefinition(); | ||
| 352 | UplevelReference r = refc.getReference(target); | ||
| 353 | r.noteReference(env, refctx); | ||
| 354 | |||
| 355 | // remember the reference pertaining to the innermost frame | ||
| 356 | if (res == null) { | ||
| 357 | res = r; | ||
| 358 | } | ||
| 359 | } | ||
| 360 | return res; | ||
| 361 | } | ||
| 362 | |||
| 363 | /** | ||
| 364 | * Implement a reference (usually an uplevel one). | ||
| 365 | * Call noteReference() first, to make sure the reference | ||
| 366 | * lists are up to date. | ||
| 367 | * <p> | ||
| 368 | * The resulting expression tree does not need checking; | ||
| 369 | * it can be code-generated right away. | ||
| 370 | * If the reference is not uplevel, the result is an IDENT or THIS. | ||
| 371 | */ | ||
| 372 | public Expression makeReference(Environment env, LocalMember target) { | ||
| 373 | UplevelReference r = noteReference(env, target); | ||
| 374 | |||
| 375 | // Now create a referencing expression. | ||
| 376 | if (r != null) { | ||
| 377 | return r.makeLocalReference(env, this); | ||
| 378 | } else if (idThis.equals(target.getName())) { | ||
| 379 | return new ThisExpression(0, target); | ||
| 380 | } else { | ||
| 381 | return new IdentifierExpression(0, target); | ||
| 382 | } | ||
| 383 | } | ||
| 384 | |||
| 385 | /** | ||
| 386 | * Return a local expression which can serve as the base reference | ||
| 387 | * for the given field. If the field is a constructor, return an | ||
| 388 | * expression for the implicit enclosing instance argument. | ||
| 389 | * <p> | ||
| 390 | * Return null if there is no need for such an argument, | ||
| 391 | * or if there was an error. | ||
| 392 | */ | ||
| 393 | public Expression findOuterLink(Environment env, long where, | ||
| 394 | MemberDefinition f) { | ||
| 395 | // reqc is the base pointer type required to use f | ||
| 396 | ClassDefinition fc = f.getClassDefinition(); | ||
| 397 | ClassDefinition reqc = f.isStatic() ? null | ||
| 398 | : !f.isConstructor() ? fc | ||
| 399 | : fc.isTopLevel() ? null | ||
| 400 | : fc.getOuterClass(); | ||
| 401 | if (reqc == null) { | ||
| 402 | return null; | ||
| 403 | } | ||
| 404 | return findOuterLink(env, where, reqc, f, false); | ||
| 405 | } | ||
| 406 | |||
| 407 | private static boolean match(Environment env, | ||
| 408 | ClassDefinition thisc, ClassDefinition reqc) { | ||
| 409 | try { | ||
| 410 | return thisc == reqc | ||
| 411 | || reqc.implementedBy(env, thisc.getClassDeclaration()); | ||
| 412 | } catch (ClassNotFound ee) { | ||
| 413 | return false; | ||
| 414 | } | ||
| 415 | } | ||
| 416 | |||
| 417 | public Expression findOuterLink(Environment env, long where, | ||
| 418 | ClassDefinition reqc, | ||
| 419 | MemberDefinition f, | ||
| 420 | boolean needExactMatch) { | ||
| 421 | if (field.isStatic()) { | ||
| 422 | if (f == null) { | ||
| 423 | // say something like: undefined variable A.this | ||
| 424 | Identifier nm = reqc.getName().getFlatName().getName(); | ||
| 425 | env.error(where, "undef.var", Identifier.lookup(nm,idThis)); | ||
| 426 | } else if (f.isConstructor()) { | ||
| 427 | env.error(where, "no.outer.arg", reqc, f.getClassDeclaration()); | ||
| 428 | } else if (f.isMethod()) { | ||
| 429 | env.error(where, "no.static.meth.access", | ||
| 430 | f, f.getClassDeclaration()); | ||
| 431 | } else { | ||
| 432 | env.error(where, "no.static.field.access", f.getName(), | ||
| 433 | f.getClassDeclaration()); | ||
| 434 | } | ||
| 435 | // This is an attempt at error recovery. | ||
| 436 | // Unfortunately, the constructor may throw | ||
| 437 | // a null pointer exception after failing to resolve | ||
| 438 | // 'idThis'. Since an error message has already been | ||
| 439 | // issued previously, this exception is caught and | ||
| 440 | // silently ignored. Ideally, we should avoid throwing | ||
| 441 | // the exception. | ||
| 442 | Expression e = new ThisExpression(where, this); | ||
| 443 | e.type = reqc.getType(); | ||
| 444 | return e; | ||
| 445 | } | ||
| 446 | |||
| 447 | // use lp to scan for current instances (locals named "this") | ||
| 448 | LocalMember lp = locals; | ||
| 449 | |||
| 450 | // thise is a link expression being built up | ||
| 451 | Expression thise = null; | ||
| 452 | |||
| 453 | // root is the local variable (idThis) at the far left of thise | ||
| 454 | LocalMember root = null; | ||
| 455 | |||
| 456 | // thisc is the class of the link expression thise | ||
| 457 | ClassDefinition thisc = null; | ||
| 458 | |||
| 459 | // conCls is the class of the "this", in a constructor | ||
| 460 | ClassDefinition conCls = null; | ||
| 461 | if (field.isConstructor()) { | ||
| 462 | conCls = field.getClassDefinition(); | ||
| 463 | } | ||
| 464 | |||
| 465 | if (!field.isMethod()) { | ||
| 466 | thisc = field.getClassDefinition(); | ||
| 467 | thise = new ThisExpression(where, this); | ||
| 468 | } | ||
| 469 | |||
| 470 | while (true) { | ||
| 471 | if (thise == null) { | ||
| 472 | // start fresh from lp | ||
| 473 | while (lp != null && !idThis.equals(lp.getName())) { | ||
| 474 | lp = lp.prev; | ||
| 475 | } | ||
| 476 | if (lp == null) { | ||
| 477 | break; | ||
| 478 | } | ||
| 479 | thise = new ThisExpression(where, lp); | ||
| 480 | thisc = lp.getClassDefinition(); | ||
| 481 | root = lp; | ||
| 482 | lp = lp.prev; | ||
| 483 | } | ||
| 484 | |||
| 485 | // Require exact class identity when called with | ||
| 486 | // 'needExactMatch' true. This is done when checking | ||
| 487 | // the '<class>.this' syntax. Fixes 4102393 and 4133457. | ||
| 488 | if (thisc == reqc || | ||
| 489 | (!needExactMatch && match(env, thisc, reqc))) { | ||
| 490 | break; | ||
| 491 | } | ||
| 492 | |||
| 493 | // move out one step, if the current instance has an outer link | ||
| 494 | |||
| 495 | MemberDefinition outerMember = thisc.findOuterMember(); | ||
| 496 | if (outerMember == null) { | ||
| 497 | thise = null; | ||
| 498 | continue; // try to find more help in lp | ||
| 499 | } | ||
| 500 | ClassDefinition prevc = thisc; | ||
| 501 | thisc = prevc.getOuterClass(); | ||
| 502 | |||
| 503 | if (prevc == conCls) { | ||
| 504 | // Must pick up "this$C" from the constructor argument, | ||
| 505 | // not from "this.this$C", since the latter may not be | ||
| 506 | // initialized properly. (This way is cheaper too.) | ||
| 507 | Identifier nm = outerMember.getName(); | ||
| 508 | IdentifierExpression arg = new IdentifierExpression(where, nm); | ||
| 509 | arg.bind(env, this); | ||
| 510 | thise = arg; | ||
| 511 | } else { | ||
| 512 | thise = new FieldExpression(where, thise, outerMember); | ||
| 513 | } | ||
| 514 | } | ||
| 515 | if (thise != null) { | ||
| 516 | // mark crossed scopes | ||
| 517 | // ????? | ||
| 518 | //ensureAvailable(root); | ||
| 519 | return thise; | ||
| 520 | } | ||
| 521 | |||
| 522 | if (f == null) { | ||
| 523 | // say something like: undefined variable A.this | ||
| 524 | Identifier nm = reqc.getName().getFlatName().getName(); | ||
| 525 | env.error(where, "undef.var", Identifier.lookup(nm,idThis)); | ||
| 526 | } else if (f.isConstructor()) { | ||
| 527 | env.error(where, "no.outer.arg", reqc, f.getClassDefinition()); | ||
| 528 | } else { | ||
| 529 | env.error(where, "no.static.field.access", f, field); | ||
| 530 | } | ||
| 531 | |||
| 532 | // avoid floodgating: | ||
| 533 | Expression e = new ThisExpression(where, this); | ||
| 534 | e.type = reqc.getType(); | ||
| 535 | return e; | ||
| 536 | } | ||
| 537 | |||
| 538 | /** | ||
| 539 | * Is there a "this" of type reqc in scope? | ||
| 540 | */ | ||
| 541 | public static boolean outerLinkExists(Environment env, | ||
| 542 | ClassDefinition reqc, | ||
| 543 | ClassDefinition thisc) { | ||
| 544 | while (!match(env, thisc, reqc)) { | ||
| 545 | if (thisc.isTopLevel()) { | ||
| 546 | return false; | ||
| 547 | } | ||
| 548 | thisc = thisc.getOuterClass(); | ||
| 549 | } | ||
| 550 | return true; | ||
| 551 | } | ||
| 552 | |||
| 553 | /** | ||
| 554 | * From which enclosing class do members of this type come? | ||
| 555 | */ | ||
| 556 | public ClassDefinition findScope(Environment env, ClassDefinition reqc) { | ||
| 557 | ClassDefinition thisc = field.getClassDefinition(); | ||
| 558 | while (thisc != null && !match(env, thisc, reqc)) { | ||
| 559 | thisc = thisc.getOuterClass(); | ||
| 560 | } | ||
| 561 | return thisc; | ||
| 562 | } | ||
| 563 | |||
| 564 | /** | ||
| 565 | * Resolve a type name from within a local scope. | ||
| 566 | * @see Environment#resolveName | ||
| 567 | */ | ||
| 568 | Identifier resolveName(Environment env, Identifier name) { | ||
| 569 | // This logic is pretty much exactly parallel to that of | ||
| 570 | // Environment.resolveName(). | ||
| 571 | if (name.isQualified()) { | ||
| 572 | // Try to resolve the first identifier component, | ||
| 573 | // because inner class names take precedence over | ||
| 574 | // package prefixes. (Cf. Environment.resolveName.) | ||
| 575 | Identifier rhead = resolveName(env, name.getHead()); | ||
| 576 | |||
| 577 | if (rhead.hasAmbigPrefix()) { | ||
| 578 | // The first identifier component refers to an | ||
| 579 | // ambiguous class. Limp on. We throw away the | ||
| 580 | // rest of the classname as it is irrelevant. | ||
| 581 | // (part of solution for 4059855). | ||
| 582 | return rhead; | ||
| 583 | } | ||
| 584 | |||
| 585 | if (!env.classExists(rhead)) { | ||
| 586 | return env.resolvePackageQualifiedName(name); | ||
| 587 | } | ||
| 588 | try { | ||
| 589 | return env.getClassDefinition(rhead). | ||
| 590 | resolveInnerClass(env, name.getTail()); | ||
| 591 | } catch (ClassNotFound ee) { | ||
| 592 | // return partially-resolved name someone else can fail on | ||
| 593 | return Identifier.lookupInner(rhead, name.getTail()); | ||
| 594 | } | ||
| 595 | } | ||
| 596 | |||
| 597 | // Look for an unqualified name in enclosing scopes. | ||
| 598 | try { | ||
| 599 | MemberDefinition f = getClassCommon(env, name, false); | ||
| 600 | if (f != null) { | ||
| 601 | return f.getInnerClass().getName(); | ||
| 602 | } | ||
| 603 | } catch (ClassNotFound ee) { | ||
| 604 | // a missing superclass, or something catastrophic | ||
| 605 | } | ||
| 606 | |||
| 607 | // look in imports, etc. | ||
| 608 | return env.resolveName(name); | ||
| 609 | } | ||
| 610 | |||
| 611 | /** | ||
| 612 | * Return the name of a lexically apparent type, | ||
| 613 | * skipping inherited members, and ignoring | ||
| 614 | * the current pacakge and imports. | ||
| 615 | * This is used for error checking. | ||
| 616 | */ | ||
| 617 | public | ||
| 618 | Identifier getApparentClassName(Environment env, Identifier name) { | ||
| 619 | if (name.isQualified()) { | ||
| 620 | // Try to resolve the first identifier component, | ||
| 621 | // because inner class names take precedence over | ||
| 622 | // package prefixes. (Cf. Environment.resolveName.) | ||
| 623 | Identifier rhead = getApparentClassName(env, name.getHead()); | ||
| 624 | return (rhead == null) ? idNull | ||
| 625 | : Identifier.lookup(rhead, | ||
| 626 | name.getTail()); | ||
| 627 | } | ||
| 628 | |||
| 629 | // Look for an unqualified name in enclosing scopes. | ||
| 630 | try { | ||
| 631 | MemberDefinition f = getClassCommon(env, name, true); | ||
| 632 | if (f != null) { | ||
| 633 | return f.getInnerClass().getName(); | ||
| 634 | } | ||
| 635 | } catch (ClassNotFound ee) { | ||
| 636 | // a missing superclass, or something catastrophic | ||
| 637 | } | ||
| 638 | |||
| 639 | // the enclosing class name is the only apparent package member: | ||
| 640 | Identifier topnm = field.getClassDefinition().getTopClass().getName(); | ||
| 641 | if (topnm.getName().equals(name)) { | ||
| 642 | return topnm; | ||
| 643 | } | ||
| 644 | return idNull; | ||
| 645 | } | ||
| 646 | |||
| 647 | /** | ||
| 648 | * Raise an error if a blank final was definitely unassigned | ||
| 649 | * on entry to a loop, but has possibly been assigned on the | ||
| 650 | * back-branch. If this is the case, the loop may be assigning | ||
| 651 | * it multiple times. | ||
| 652 | */ | ||
| 653 | public void checkBackBranch(Environment env, Statement loop, | ||
| 654 | Vset vsEntry, Vset vsBack) { | ||
| 655 | for (LocalMember f = locals ; f != null ; f = f.prev) { | ||
| 656 | if (f.isBlankFinal() | ||
| 657 | && vsEntry.testVarUnassigned(f.number) | ||
| 658 | && !vsBack.testVarUnassigned(f.number)) { | ||
| 659 | env.error(loop.where, "assign.to.blank.final.in.loop", | ||
| 660 | f.getName()); | ||
| 661 | } | ||
| 662 | } | ||
| 663 | } | ||
| 664 | |||
| 665 | /** | ||
| 666 | * Check if a field can reach another field (only considers | ||
| 667 | * forward references, not the access modifiers). | ||
| 668 | */ | ||
| 669 | public boolean canReach(Environment env, MemberDefinition f) { | ||
| 670 | return field.canReach(env, f); | ||
| 671 | } | ||
| 672 | |||
| 673 | /** | ||
| 674 | * Get the context that corresponds to a label, return null if | ||
| 675 | * not found. | ||
| 676 | */ | ||
| 677 | public | ||
| 678 | Context getLabelContext(Identifier lbl) { | ||
| 679 | for (Context ctx = this ; ctx != null ; ctx = ctx.prev) { | ||
| 680 | if ((ctx.node != null) && (ctx.node instanceof Statement)) { | ||
| 681 | if (((Statement)(ctx.node)).hasLabel(lbl)) | ||
| 682 | return ctx; | ||
| 683 | } | ||
| 684 | } | ||
| 685 | return null; | ||
| 686 | } | ||
| 687 | |||
| 688 | /** | ||
| 689 | * Get the destination context of a break | ||
| 690 | */ | ||
| 691 | public | ||
| 692 | Context getBreakContext(Identifier lbl) { | ||
| 693 | if (lbl != null) { | ||
| 694 | return getLabelContext(lbl); | ||
| 695 | } | ||
| 696 | for (Context ctx = this ; ctx != null ; ctx = ctx.prev) { | ||
| 697 | if (ctx.node != null) { | ||
| 698 | switch (ctx.node.op) { | ||
| 699 | case SWITCH: | ||
| 700 | case FOR: | ||
| 701 | case DO: | ||
| 702 | case WHILE: | ||
| 703 | return ctx; | ||
| 704 | } | ||
| 705 | } | ||
| 706 | } | ||
| 707 | return null; | ||
| 708 | } | ||
| 709 | |||
| 710 | /** | ||
| 711 | * Get the destination context of a continue | ||
| 712 | */ | ||
| 713 | public | ||
| 714 | Context getContinueContext(Identifier lbl) { | ||
| 715 | if (lbl != null) { | ||
| 716 | return getLabelContext(lbl); | ||
| 717 | } | ||
| 718 | for (Context ctx = this ; ctx != null ; ctx = ctx.prev) { | ||
| 719 | if (ctx.node != null) { | ||
| 720 | switch (ctx.node.op) { | ||
| 721 | case FOR: | ||
| 722 | case DO: | ||
| 723 | case WHILE: | ||
| 724 | return ctx; | ||
| 725 | } | ||
| 726 | } | ||
| 727 | } | ||
| 728 | return null; | ||
| 729 | } | ||
| 730 | |||
| 731 | /** | ||
| 732 | * Get the destination context of a return (the method body) | ||
| 733 | */ | ||
| 734 | public | ||
| 735 | CheckContext getReturnContext() { | ||
| 736 | for (Context ctx = this ; ctx != null ; ctx = ctx.prev) { | ||
| 737 | // The METHOD node is set up by Statement.checkMethod(). | ||
| 738 | if (ctx.node != null && ctx.node.op == METHOD) { | ||
| 739 | return (CheckContext)ctx; | ||
| 740 | } | ||
| 741 | } | ||
| 742 | return null; | ||
| 743 | } | ||
| 744 | |||
| 745 | /** | ||
| 746 | * Get the context of the innermost surrounding try-block. | ||
| 747 | * Consider only try-blocks contained within the same method. | ||
| 748 | * (There could be others when searching from within a method | ||
| 749 | * of a local class, but they are irrelevant to our purpose.) | ||
| 750 | * This is used for recording DA/DU information preceding | ||
| 751 | * all abnormal transfers of control: break, continue, return, | ||
| 752 | * and throw. | ||
| 753 | */ | ||
| 754 | public | ||
| 755 | CheckContext getTryExitContext() { | ||
| 756 | for (Context ctx = this; | ||
| 757 | ctx != null && ctx.node != null && ctx.node.op != METHOD; | ||
| 758 | ctx = ctx.prev) { | ||
| 759 | if (ctx.node.op == TRY) { | ||
| 760 | return (CheckContext)ctx; | ||
| 761 | } | ||
| 762 | } | ||
| 763 | return null; | ||
| 764 | } | ||
| 765 | |||
| 766 | /** | ||
| 767 | * Get the nearest inlined context | ||
| 768 | */ | ||
| 769 | Context getInlineContext() { | ||
| 770 | for (Context ctx = this ; ctx != null ; ctx = ctx.prev) { | ||
| 771 | if (ctx.node != null) { | ||
| 772 | switch (ctx.node.op) { | ||
| 773 | case INLINEMETHOD: | ||
| 774 | case INLINENEWINSTANCE: | ||
| 775 | return ctx; | ||
| 776 | } | ||
| 777 | } | ||
| 778 | } | ||
| 779 | return null; | ||
| 780 | } | ||
| 781 | |||
| 782 | /** | ||
| 783 | * Get the context of a field that is being inlined | ||
| 784 | */ | ||
| 785 | Context getInlineMemberContext(MemberDefinition field) { | ||
| 786 | for (Context ctx = this ; ctx != null ; ctx = ctx.prev) { | ||
| 787 | if (ctx.node != null) { | ||
| 788 | switch (ctx.node.op) { | ||
| 789 | case INLINEMETHOD: | ||
| 790 | if (((InlineMethodExpression)ctx.node).field.equals(field)) { | ||
| 791 | return ctx; | ||
| 792 | } | ||
| 793 | break; | ||
| 794 | case INLINENEWINSTANCE: | ||
| 795 | if (((InlineNewInstanceExpression)ctx.node).field.equals(field)) { | ||
| 796 | return ctx; | ||
| 797 | } | ||
| 798 | } | ||
| 799 | } | ||
| 800 | } | ||
| 801 | return null; | ||
| 802 | } | ||
| 803 | |||
| 804 | /** | ||
| 805 | * Remove variables from the vset set that are no longer part of | ||
| 806 | * this context. | ||
| 807 | */ | ||
| 808 | public final Vset removeAdditionalVars(Vset vset) { | ||
| 809 | return vset.removeAdditionalVars(varNumber); | ||
| 810 | } | ||
| 811 | |||
| 812 | public final int getVarNumber() { | ||
| 813 | return varNumber; | ||
| 814 | } | ||
| 815 | |||
| 816 | /** | ||
| 817 | * Return the number of the innermost current instance reference. | ||
| 818 | */ | ||
| 819 | public int getThisNumber() { | ||
| 820 | LocalMember thisf = getLocalField(idThis); | ||
| 821 | if (thisf != null | ||
| 822 | && thisf.getClassDefinition() == field.getClassDefinition()) { | ||
| 823 | return thisf.number; | ||
| 824 | } | ||
| 825 | // this is a variable; there is no "this" (should not happen) | ||
| 826 | return varNumber; | ||
| 827 | } | ||
| 828 | |||
| 829 | /** | ||
| 830 | * Return the field containing the present context. | ||
| 831 | */ | ||
| 832 | public final MemberDefinition getField() { | ||
| 833 | return field; | ||
| 834 | } | ||
| 835 | |||
| 836 | /** | ||
| 837 | * Extend an environment with the given context. | ||
| 838 | * The resulting environment behaves the same as | ||
| 839 | * the given one, except that resolveName() takes | ||
| 840 | * into account local class names in this context. | ||
| 841 | */ | ||
| 842 | public static Environment newEnvironment(Environment env, Context ctx) { | ||
| 843 | return new ContextEnvironment(env, ctx); | ||
| 844 | } | ||
| 845 | } | ||
| 846 | |||
| 847 | final | ||
| 848 | class ContextEnvironment extends Environment { | ||
| 849 | Context ctx; | ||
| 850 | Environment innerEnv; | ||
| 851 | |||
| 852 | ContextEnvironment(Environment env, Context ctx) { | ||
| 853 | super(env, env.getSource()); | ||
| 854 | this.ctx = ctx; | ||
| 855 | this.innerEnv = env; | ||
| 856 | } | ||
| 857 | |||
| 858 | public Identifier resolveName(Identifier name) { | ||
| 859 | return ctx.resolveName(innerEnv, name); | ||
| 860 | } | ||
| 861 | } | ||