J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2003 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.tools.tree; |
| 27 | |
| 28 | import sun.tools.java.*; |
| 29 | import sun.tools.asm.Assembler; |
| 30 | import java.util.Hashtable; |
| 31 | |
| 32 | /** |
| 33 | * WARNING: The contents of this source file are not part of any |
| 34 | * supported API. Code that depends on them does so at its own risk: |
| 35 | * they are subject to change or removal without notice. |
| 36 | */ |
| 37 | public |
| 38 | class NewInstanceExpression extends NaryExpression { |
| 39 | MemberDefinition field; |
| 40 | Expression outerArg; |
| 41 | ClassDefinition body; |
| 42 | |
| 43 | // Access method for constructor, if needed. |
| 44 | MemberDefinition implMethod = null; |
| 45 | |
| 46 | /** |
| 47 | * Constructor |
| 48 | */ |
| 49 | public NewInstanceExpression(long where, Expression right, Expression args[]) { |
| 50 | super(NEWINSTANCE, where, Type.tError, right, args); |
| 51 | } |
| 52 | public NewInstanceExpression(long where, Expression right, |
| 53 | Expression args[], |
| 54 | Expression outerArg, ClassDefinition body) { |
| 55 | this(where, right, args); |
| 56 | this.outerArg = outerArg; |
| 57 | this.body = body; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * From the "new" in an expression of the form outer.new InnerCls(...), |
| 62 | * return the "outer" expression, or null if there is none. |
| 63 | */ |
| 64 | public Expression getOuterArg() { |
| 65 | return outerArg; |
| 66 | } |
| 67 | |
| 68 | int precedence() { |
| 69 | return 100; |
| 70 | } |
| 71 | |
| 72 | public Expression order() { |
| 73 | // act like a method or field reference expression: |
| 74 | if (outerArg != null && opPrecedence[FIELD] > outerArg.precedence()) { |
| 75 | UnaryExpression e = (UnaryExpression)outerArg; |
| 76 | outerArg = e.right; |
| 77 | e.right = order(); |
| 78 | return e; |
| 79 | } |
| 80 | return this; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Check expression type |
| 85 | */ |
| 86 | public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { |
| 87 | // What type? |
| 88 | ClassDefinition def = null; |
| 89 | |
| 90 | Expression alreadyChecked = null; |
| 91 | |
| 92 | try { |
| 93 | if (outerArg != null) { |
| 94 | vset = outerArg.checkValue(env, ctx, vset, exp); |
| 95 | |
| 96 | // Remember the expression that we already checked |
| 97 | // so that we don't attempt to check it again when |
| 98 | // it appears as an argument to the constructor. |
| 99 | // Fix for 4030426. |
| 100 | alreadyChecked = outerArg; |
| 101 | |
| 102 | // Check outerArg and the type name together. |
| 103 | Identifier typeName = FieldExpression.toIdentifier(right); |
| 104 | |
| 105 | // According to the inner classes spec, the type name in a |
| 106 | // qualified 'new' expression must be a single identifier. |
| 107 | if (typeName != null && typeName.isQualified()) { |
| 108 | env.error(where, "unqualified.name.required", typeName); |
| 109 | } |
| 110 | |
| 111 | if (typeName == null || !outerArg.type.isType(TC_CLASS)) { |
| 112 | if (!outerArg.type.isType(TC_ERROR)) { |
| 113 | env.error(where, "invalid.field.reference", |
| 114 | idNew, outerArg.type); |
| 115 | } |
| 116 | outerArg = null; |
| 117 | } else { |
| 118 | // Don't perform checks on components of qualified name |
| 119 | // ('getQualifiedClassDefinition'), because a qualified |
| 120 | // name is illegal in this context, and will have previously |
| 121 | // been reported as an error. |
| 122 | ClassDefinition oc = env.getClassDefinition(outerArg.type); |
| 123 | Identifier nm = oc.resolveInnerClass(env, typeName); |
| 124 | right = new TypeExpression(right.where, Type.tClass(nm)); |
| 125 | // Check access directly, since we're not calling toType(). |
| 126 | env.resolve(right.where, ctx.field.getClassDefinition(), |
| 127 | right.type); |
| 128 | // and fall through to env.getClassDefinition() below |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | if (!(right instanceof TypeExpression)) { |
| 133 | // The call to 'toType' should perform component access checks. |
| 134 | right = new TypeExpression(right.where, right.toType(env, ctx)); |
| 135 | } |
| 136 | |
| 137 | if (right.type.isType(TC_CLASS)) |
| 138 | def = env.getClassDefinition(right.type); |
| 139 | } catch (AmbiguousClass ee) { |
| 140 | env.error(where, "ambig.class", ee.name1, ee.name2); |
| 141 | } catch (ClassNotFound ee) { |
| 142 | env.error(where, "class.not.found", ee.name, ctx.field); |
| 143 | } |
| 144 | |
| 145 | Type t = right.type; |
| 146 | boolean hasErrors = t.isType(TC_ERROR); |
| 147 | |
| 148 | if (!t.isType(TC_CLASS)) { |
| 149 | if (!hasErrors) { |
| 150 | env.error(where, "invalid.arg.type", t, opNames[op]); |
| 151 | hasErrors = true; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | // If we failed to find a class or a class was ambiguous, def |
| 156 | // may be null. Bail out. This allows us to report multiple |
| 157 | // unfound or ambiguous classes rather than tripping over an |
| 158 | // internal compiler error. |
| 159 | if (def == null) { |
| 160 | type = Type.tError; |
| 161 | return vset; |
| 162 | } |
| 163 | |
| 164 | // Add an extra argument, maybe. |
| 165 | Expression args[] = this.args; |
| 166 | args = NewInstanceExpression. |
| 167 | insertOuterLink(env, ctx, where, def, outerArg, args); |
| 168 | if (args.length > this.args.length) |
| 169 | outerArg = args[0]; // recopy the checked arg |
| 170 | else if (outerArg != null) |
| 171 | // else set it to void (maybe it has a side-effect) |
| 172 | outerArg = new CommaExpression(outerArg.where, outerArg, null); |
| 173 | |
| 174 | // Compose a list of argument types |
| 175 | Type argTypes[] = new Type[args.length]; |
| 176 | |
| 177 | for (int i = 0 ; i < args.length ; i++) { |
| 178 | // Don't check 'outerArg' again. Fix for 4030426. |
| 179 | if (args[i] != alreadyChecked) { |
| 180 | vset = args[i].checkValue(env, ctx, vset, exp); |
| 181 | } |
| 182 | argTypes[i] = args[i].type; |
| 183 | hasErrors = hasErrors || argTypes[i].isType(TC_ERROR); |
| 184 | } |
| 185 | |
| 186 | try { |
| 187 | // Check if there are any type errors in the arguments |
| 188 | if (hasErrors) { |
| 189 | type = Type.tError; |
| 190 | return vset; |
| 191 | } |
| 192 | |
| 193 | |
| 194 | // Get the source class that this declaration appears in. |
| 195 | ClassDefinition sourceClass = ctx.field.getClassDefinition(); |
| 196 | |
| 197 | ClassDeclaration c = env.getClassDeclaration(t); |
| 198 | |
| 199 | // If this is an anonymous class, handle it specially now. |
| 200 | if (body != null) { |
| 201 | // The current package. |
| 202 | Identifier packageName = sourceClass.getName().getQualifier(); |
| 203 | |
| 204 | // This is an anonymous class. |
| 205 | ClassDefinition superDef = null; |
| 206 | if (def.isInterface()) { |
| 207 | // For interfaces, our superclass is java.lang.Object. |
| 208 | // We could just assume that java.lang.Object has |
| 209 | // one constructor with no arguments in the code |
| 210 | // that follows, but we don't. This way, if Object |
| 211 | // grows a new constructor (unlikely) then the |
| 212 | // compiler should handle it. |
| 213 | superDef = env.getClassDefinition(idJavaLangObject); |
| 214 | } else { |
| 215 | // Otherwise, def is actually our superclass. |
| 216 | superDef = def; |
| 217 | } |
| 218 | // Try to find a matching constructor in our superclass. |
| 219 | MemberDefinition constructor = |
| 220 | superDef.matchAnonConstructor(env, packageName, argTypes); |
| 221 | if (constructor != null) { |
| 222 | // We've found one. Process the body. |
| 223 | // |
| 224 | // Note that we are passing in the constructors' argument |
| 225 | // types, rather than the argument types of the actual |
| 226 | // expressions, to checkLocalClass(). Previously, |
| 227 | // the expression types were passed in. This could |
| 228 | // lead to trouble when one of the argument types was |
| 229 | // the special internal type tNull. (bug 4054689). |
| 230 | if (tracing) |
| 231 | env.dtEvent( |
| 232 | "NewInstanceExpression.checkValue: ANON CLASS " + |
| 233 | body + " SUPER " + def); |
| 234 | vset = body.checkLocalClass(env, ctx, vset, |
| 235 | def, args, |
| 236 | constructor.getType() |
| 237 | .getArgumentTypes()); |
| 238 | |
| 239 | // Set t to be the true type of this expression. |
| 240 | // (bug 4102056). |
| 241 | t = body.getClassDeclaration().getType(); |
| 242 | |
| 243 | def = body; |
| 244 | } |
| 245 | } else { |
| 246 | // Check if it is an interface |
| 247 | if (def.isInterface()) { |
| 248 | env.error(where, "new.intf", c); |
| 249 | return vset; |
| 250 | } |
| 251 | |
| 252 | // Check for abstract class |
| 253 | if (def.mustBeAbstract(env)) { |
| 254 | env.error(where, "new.abstract", c); |
| 255 | return vset; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | // Get the constructor that the "new" expression should call. |
| 260 | field = def.matchMethod(env, sourceClass, idInit, argTypes); |
| 261 | |
| 262 | // Report an error if there is no matching constructor. |
| 263 | if (field == null) { |
| 264 | MemberDefinition anyInit = def.findAnyMethod(env, idInit); |
| 265 | if (anyInit != null && |
| 266 | new MethodExpression(where, right, anyInit, args) |
| 267 | .diagnoseMismatch(env, args, argTypes)) |
| 268 | return vset; |
| 269 | String sig = c.getName().getName().toString(); |
| 270 | sig = Type.tMethod(Type.tError, argTypes).typeString(sig, false, false); |
| 271 | env.error(where, "unmatched.constr", sig, c); |
| 272 | return vset; |
| 273 | } |
| 274 | |
| 275 | if (field.isPrivate()) { |
| 276 | ClassDefinition cdef = field.getClassDefinition(); |
| 277 | if (cdef != sourceClass) { |
| 278 | // Use access method. |
| 279 | implMethod = cdef.getAccessMember(env, ctx, field, false); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | // Check for abstract anonymous class |
| 284 | if (def.mustBeAbstract(env)) { |
| 285 | env.error(where, "new.abstract", c); |
| 286 | return vset; |
| 287 | } |
| 288 | |
| 289 | if (field.reportDeprecated(env)) { |
| 290 | env.error(where, "warn.constr.is.deprecated", |
| 291 | field, field.getClassDefinition()); |
| 292 | } |
| 293 | |
| 294 | // According to JLS 6.6.2, a protected constructor may be accessed |
| 295 | // by a class instance creation expression only from within the |
| 296 | // package in which it is defined. |
| 297 | if (field.isProtected() && |
| 298 | !(sourceClass.getName().getQualifier().equals( |
| 299 | field.getClassDeclaration().getName().getQualifier()))) { |
| 300 | env.error(where, "invalid.protected.constructor.use", |
| 301 | sourceClass); |
| 302 | } |
| 303 | |
| 304 | } catch (ClassNotFound ee) { |
| 305 | env.error(where, "class.not.found", ee.name, opNames[op]); |
| 306 | return vset; |
| 307 | |
| 308 | } catch (AmbiguousMember ee) { |
| 309 | env.error(where, "ambig.constr", ee.field1, ee.field2); |
| 310 | return vset; |
| 311 | } |
| 312 | |
| 313 | // Cast arguments |
| 314 | argTypes = field.getType().getArgumentTypes(); |
| 315 | for (int i = 0 ; i < args.length ; i++) { |
| 316 | args[i] = convert(env, ctx, argTypes[i], args[i]); |
| 317 | } |
| 318 | if (args.length > this.args.length) { |
| 319 | outerArg = args[0]; // recopy the checked arg |
| 320 | // maintain an accurate tree |
| 321 | for (int i = 1 ; i < args.length ; i++) { |
| 322 | this.args[i-1] = args[i]; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | // Throw the declared exceptions. |
| 327 | ClassDeclaration exceptions[] = field.getExceptions(env); |
| 328 | for (int i = 0 ; i < exceptions.length ; i++) { |
| 329 | if (exp.get(exceptions[i]) == null) { |
| 330 | exp.put(exceptions[i], this); |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | type = t; |
| 335 | |
| 336 | return vset; |
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * Given a list of arguments for a constructor, |
| 341 | * return a possibly modified list which includes the hidden |
| 342 | * argument which initializes the uplevel self pointer. |
| 343 | * @arg def the class which perhaps contains an outer link. |
| 344 | * @arg outerArg if non-null, an explicit location in which to construct. |
| 345 | */ |
| 346 | public static Expression[] insertOuterLink(Environment env, Context ctx, |
| 347 | long where, ClassDefinition def, |
| 348 | Expression outerArg, |
| 349 | Expression args[]) { |
| 350 | if (!def.isTopLevel() && !def.isLocal()) { |
| 351 | Expression args2[] = new Expression[1+args.length]; |
| 352 | System.arraycopy(args, 0, args2, 1, args.length); |
| 353 | try { |
| 354 | if (outerArg == null) |
| 355 | outerArg = ctx.findOuterLink(env, where, |
| 356 | def.findAnyMethod(env, idInit)); |
| 357 | } catch (ClassNotFound e) { |
| 358 | // die somewhere else |
| 359 | } |
| 360 | args2[0] = outerArg; |
| 361 | args = args2; |
| 362 | } |
| 363 | return args; |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * Check void expression |
| 368 | */ |
| 369 | public Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { |
| 370 | return checkValue(env, ctx, vset, exp); |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * Inline |
| 375 | */ |
| 376 | final int MAXINLINECOST = Statement.MAXINLINECOST; |
| 377 | |
| 378 | public Expression copyInline(Context ctx) { |
| 379 | NewInstanceExpression e = (NewInstanceExpression)super.copyInline(ctx); |
| 380 | if (outerArg != null) { |
| 381 | e.outerArg = outerArg.copyInline(ctx); |
| 382 | } |
| 383 | return e; |
| 384 | } |
| 385 | |
| 386 | Expression inlineNewInstance(Environment env, Context ctx, Statement s) { |
| 387 | if (env.dump()) { |
| 388 | System.out.println("INLINE NEW INSTANCE " + field + " in " + ctx.field); |
| 389 | } |
| 390 | LocalMember v[] = LocalMember.copyArguments(ctx, field); |
| 391 | Statement body[] = new Statement[v.length + 2]; |
| 392 | |
| 393 | int o = 1; |
| 394 | if (outerArg != null && !outerArg.type.isType(TC_VOID)) { |
| 395 | o = 2; |
| 396 | body[1] = new VarDeclarationStatement(where, v[1], outerArg); |
| 397 | } else if (outerArg != null) { |
| 398 | body[0] = new ExpressionStatement(where, outerArg); |
| 399 | } |
| 400 | for (int i = 0 ; i < args.length ; i++) { |
| 401 | body[i+o] = new VarDeclarationStatement(where, v[i+o], args[i]); |
| 402 | } |
| 403 | //System.out.print("BEFORE:"); s.print(System.out); System.out.println(); |
| 404 | body[body.length - 1] = (s != null) ? s.copyInline(ctx, false) : null; |
| 405 | //System.out.print("COPY:"); body[body.length - 1].print(System.out); System.out.println(); |
| 406 | //System.out.print("AFTER:"); s.print(System.out); System.out.println(); |
| 407 | LocalMember.doneWithArguments(ctx, v); |
| 408 | |
| 409 | return new InlineNewInstanceExpression(where, type, field, new CompoundStatement(where, body)).inline(env, ctx); |
| 410 | } |
| 411 | |
| 412 | public Expression inline(Environment env, Context ctx) { |
| 413 | return inlineValue(env, ctx); |
| 414 | } |
| 415 | public Expression inlineValue(Environment env, Context ctx) { |
| 416 | if (body != null) { |
| 417 | body.inlineLocalClass(env); |
| 418 | } |
| 419 | ClassDefinition refc = field.getClassDefinition(); |
| 420 | UplevelReference r = refc.getReferencesFrozen(); |
| 421 | if (r != null) { |
| 422 | r.willCodeArguments(env, ctx); |
| 423 | } |
| 424 | //right = right.inlineValue(env, ctx); |
| 425 | |
| 426 | try { |
| 427 | if (outerArg != null) { |
| 428 | if (outerArg.type.isType(TC_VOID)) |
| 429 | outerArg = outerArg.inline(env, ctx); |
| 430 | else |
| 431 | outerArg = outerArg.inlineValue(env, ctx); |
| 432 | } |
| 433 | for (int i = 0 ; i < args.length ; i++) { |
| 434 | args[i] = args[i].inlineValue(env, ctx); |
| 435 | } |
| 436 | // This 'false' that fy put in is inexplicable to me |
| 437 | // the decision to not inline new instance expressions |
| 438 | // should be revisited. - dps |
| 439 | if (false && env.opt() && field.isInlineable(env, false) && |
| 440 | (!ctx.field.isInitializer()) && ctx.field.isMethod() && |
| 441 | (ctx.getInlineMemberContext(field) == null)) { |
| 442 | Statement s = (Statement)field.getValue(env); |
| 443 | if ((s == null) |
| 444 | || (s.costInline(MAXINLINECOST, env, ctx) < MAXINLINECOST)) { |
| 445 | return inlineNewInstance(env, ctx, s); |
| 446 | } |
| 447 | } |
| 448 | } catch (ClassNotFound e) { |
| 449 | throw new CompilerError(e); |
| 450 | } |
| 451 | if (outerArg != null && outerArg.type.isType(TC_VOID)) { |
| 452 | Expression e = outerArg; |
| 453 | outerArg = null; |
| 454 | return new CommaExpression(where, e, this); |
| 455 | } |
| 456 | return this; |
| 457 | } |
| 458 | |
| 459 | public int costInline(int thresh, Environment env, Context ctx) { |
| 460 | if (body != null) { |
| 461 | return thresh; // don't copy classes... |
| 462 | } |
| 463 | if (ctx == null) { |
| 464 | return 2 + super.costInline(thresh, env, ctx); |
| 465 | } |
| 466 | // sourceClass is the current class trying to inline this method |
| 467 | ClassDefinition sourceClass = ctx.field.getClassDefinition(); |
| 468 | try { |
| 469 | // We only allow the inlining if the current class can access |
| 470 | // the field and the field's class; |
| 471 | if ( sourceClass.permitInlinedAccess(env, field.getClassDeclaration()) |
| 472 | && sourceClass.permitInlinedAccess(env, field)) { |
| 473 | return 2 + super.costInline(thresh, env, ctx); |
| 474 | } |
| 475 | } catch (ClassNotFound e) { |
| 476 | } |
| 477 | return thresh; |
| 478 | } |
| 479 | |
| 480 | |
| 481 | /** |
| 482 | * Code |
| 483 | */ |
| 484 | public void code(Environment env, Context ctx, Assembler asm) { |
| 485 | codeCommon(env, ctx, asm, false); |
| 486 | } |
| 487 | public void codeValue(Environment env, Context ctx, Assembler asm) { |
| 488 | codeCommon(env, ctx, asm, true); |
| 489 | } |
| 490 | private void codeCommon(Environment env, Context ctx, Assembler asm, |
| 491 | boolean forValue) { |
| 492 | asm.add(where, opc_new, field.getClassDeclaration()); |
| 493 | if (forValue) { |
| 494 | asm.add(where, opc_dup); |
| 495 | } |
| 496 | |
| 497 | ClassDefinition refc = field.getClassDefinition(); |
| 498 | UplevelReference r = refc.getReferencesFrozen(); |
| 499 | |
| 500 | if (r != null) { |
| 501 | r.codeArguments(env, ctx, asm, where, field); |
| 502 | } |
| 503 | |
| 504 | if (outerArg != null) { |
| 505 | outerArg.codeValue(env, ctx, asm); |
| 506 | switch (outerArg.op) { |
| 507 | case THIS: |
| 508 | case SUPER: |
| 509 | case NEW: |
| 510 | // guaranteed non-null |
| 511 | break; |
| 512 | case FIELD: { |
| 513 | MemberDefinition f = ((FieldExpression)outerArg).field; |
| 514 | if (f != null && f.isNeverNull()) { |
| 515 | break; |
| 516 | } |
| 517 | // else fall through: |
| 518 | } |
| 519 | default: |
| 520 | // Test for nullity by invoking some trivial operation |
| 521 | // that can throw a NullPointerException. |
| 522 | try { |
| 523 | ClassDefinition c = env.getClassDefinition(idJavaLangObject); |
| 524 | MemberDefinition getc = c.getFirstMatch(idGetClass); |
| 525 | asm.add(where, opc_dup); |
| 526 | asm.add(where, opc_invokevirtual, getc); |
| 527 | asm.add(where, opc_pop); |
| 528 | } catch (ClassNotFound e) { |
| 529 | } |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | if (implMethod != null) { |
| 534 | // Constructor call will be via an access method. |
| 535 | // Pass 'null' as the value of the dummy argument. |
| 536 | asm.add(where, opc_aconst_null); |
| 537 | } |
| 538 | |
| 539 | for (int i = 0 ; i < args.length ; i++) { |
| 540 | args[i].codeValue(env, ctx, asm); |
| 541 | } |
| 542 | asm.add(where, opc_invokespecial, |
| 543 | ((implMethod != null) ? implMethod : field)); |
| 544 | } |
| 545 | } |