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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 | import java.io.PrintStream; | ||
| 31 | import java.util.Hashtable; | ||
| 32 | |||
| 33 | /** | ||
| 34 | * WARNING: The contents of this source file are not part of any | ||
| 35 | * supported API. Code that depends on them does so at its own risk: | ||
| 36 | * they are subject to change or removal without notice. | ||
| 37 | */ | ||
| 38 | public | ||
| 39 | class MethodExpression extends NaryExpression { | ||
| 40 | Identifier id; | ||
| 41 | ClassDefinition clazz; // The class in which the called method is defined | ||
| 42 | MemberDefinition field; | ||
| 43 | Expression implementation; | ||
| 44 | |||
| 45 | private boolean isSuper; // Set if qualified by 'super' or '<class>.super'. | ||
| 46 | |||
| 47 | /** | ||
| 48 | * constructor | ||
| 49 | */ | ||
| 50 | public MethodExpression(long where, Expression right, Identifier id, Expression args[]) { | ||
| 51 | super(METHOD, where, Type.tError, right, args); | ||
| 52 | this.id = id; | ||
| 53 | } | ||
| 54 | public MethodExpression(long where, Expression right, MemberDefinition field, Expression args[]) { | ||
| 55 | super(METHOD, where, field.getType().getReturnType(), right, args); | ||
| 56 | this.id = field.getName(); | ||
| 57 | this.field = field; | ||
| 58 | this.clazz = field.getClassDefinition(); | ||
| 59 | } | ||
| 60 | |||
| 61 | // This is a hack used only within certain access methods generated by | ||
| 62 | // 'SourceClass.getAccessMember'. It allows an 'invokespecial' instruction | ||
| 63 | // to be forced even though 'super' does not appear within the call. | ||
| 64 | // Such access methods are needed for access to protected methods when using | ||
| 65 | // the qualified '<class>.super.<method>(...)' notation. | ||
| 66 | public MethodExpression(long where, Expression right, | ||
| 67 | MemberDefinition field, Expression args[], boolean forceSuper) { | ||
| 68 | this(where, right, field, args); | ||
| 69 | this.isSuper = forceSuper; | ||
| 70 | } | ||
| 71 | |||
| 72 | public Expression getImplementation() { | ||
| 73 | if (implementation != null) | ||
| 74 | return implementation; | ||
| 75 | return this; | ||
| 76 | } | ||
| 77 | |||
| 78 | /** | ||
| 79 | * Check expression type | ||
| 80 | */ | ||
| 81 | public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { | ||
| 82 | ClassDeclaration c = null; | ||
| 83 | boolean isArray = false; | ||
| 84 | boolean staticRef = false; | ||
| 85 | |||
| 86 | // Access method to use if required. | ||
| 87 | MemberDefinition implMethod = null; | ||
| 88 | |||
| 89 | ClassDefinition ctxClass = ctx.field.getClassDefinition(); | ||
| 90 | |||
| 91 | // When calling a constructor, we may need to add an | ||
| 92 | // additional argument to transmit the outer instance link. | ||
| 93 | Expression args[] = this.args; | ||
| 94 | if (id.equals(idInit)){ | ||
| 95 | ClassDefinition conCls = ctxClass; | ||
| 96 | try { | ||
| 97 | Expression conOuter = null; | ||
| 98 | if (right instanceof SuperExpression) { | ||
| 99 | // outer.super(...) | ||
| 100 | conCls = conCls.getSuperClass().getClassDefinition(env); | ||
| 101 | conOuter = ((SuperExpression)right).outerArg; | ||
| 102 | } else if (right instanceof ThisExpression) { | ||
| 103 | // outer.this(...) | ||
| 104 | conOuter = ((ThisExpression)right).outerArg; | ||
| 105 | } | ||
| 106 | args = NewInstanceExpression. | ||
| 107 | insertOuterLink(env, ctx, where, conCls, conOuter, args); | ||
| 108 | } catch (ClassNotFound ee) { | ||
| 109 | // the same error is handled elsewhere | ||
| 110 | } | ||
| 111 | } | ||
| 112 | |||
| 113 | Type argTypes[] = new Type[args.length]; | ||
| 114 | |||
| 115 | // The effective accessing class, for access checking. | ||
| 116 | // This is normally the immediately enclosing class. | ||
| 117 | ClassDefinition sourceClass = ctxClass; | ||
| 118 | |||
| 119 | try { | ||
| 120 | if (right == null) { | ||
| 121 | staticRef = ctx.field.isStatic(); | ||
| 122 | // Find the first outer scope that mentions the method. | ||
| 123 | ClassDefinition cdef = ctxClass; | ||
| 124 | MemberDefinition m = null; | ||
| 125 | for (; cdef != null; cdef = cdef.getOuterClass()) { | ||
| 126 | m = cdef.findAnyMethod(env, id); | ||
| 127 | if (m != null) { | ||
| 128 | break; | ||
| 129 | } | ||
| 130 | } | ||
| 131 | if (m == null) { | ||
| 132 | // this is the scope for error diagnosis | ||
| 133 | c = ctx.field.getClassDeclaration(); | ||
| 134 | } else { | ||
| 135 | // found the innermost scope in which m occurs | ||
| 136 | c = cdef.getClassDeclaration(); | ||
| 137 | |||
| 138 | // Maybe an inherited method hides an apparent method. | ||
| 139 | // Keep looking at enclosing scopes to find out. | ||
| 140 | if (m.getClassDefinition() != cdef) { | ||
| 141 | ClassDefinition cdef2 = cdef; | ||
| 142 | while ((cdef2 = cdef2.getOuterClass()) != null) { | ||
| 143 | MemberDefinition m2 = cdef2.findAnyMethod(env, id); | ||
| 144 | if (m2 != null && m2.getClassDefinition() == cdef2) { | ||
| 145 | env.error(where, "inherited.hides.method", | ||
| 146 | id, cdef.getClassDeclaration(), | ||
| 147 | cdef2.getClassDeclaration()); | ||
| 148 | break; | ||
| 149 | } | ||
| 150 | } | ||
| 151 | } | ||
| 152 | } | ||
| 153 | } else { | ||
| 154 | if (id.equals(idInit)) { | ||
| 155 | int thisN = ctx.getThisNumber(); | ||
| 156 | if (!ctx.field.isConstructor()) { | ||
| 157 | env.error(where, "invalid.constr.invoke"); | ||
| 158 | return vset.addVar(thisN); | ||
| 159 | } | ||
| 160 | // As a consequence of the DA/DU rules in the JLS (draft of | ||
| 161 | // forthcoming 2e), all variables are both definitely assigned | ||
| 162 | // and definitely unassigned in unreachable code. Normally, this | ||
| 163 | // correctly suppresses DA/DU-related errors in such code. | ||
| 164 | // The use of the DA status of the 'this' variable for the extra | ||
| 165 | // check below on correct constructor usage, however, does not quite | ||
| 166 | // fit into this DA/DU scheme. The current representation of | ||
| 167 | // Vsets for unreachable dead-ends, does not allow 'clearVar' | ||
| 168 | // to work, as the DA/DU bits (all on) are implicitly represented | ||
| 169 | // by the fact that the Vset is a dead-end. The DA/DU status | ||
| 170 | // of the 'this' variable is supposed to be temporarily | ||
| 171 | // cleared at the beginning of a constructor and during the | ||
| 172 | // checking of constructor arguments (see below in this method). | ||
| 173 | // Since 'clearVar' has no effect on dead-ends, we may | ||
| 174 | // find the 'this' variable in an erroneously definitely-assigned state. | ||
| 175 | // As a workaround, we suppress the following error message when | ||
| 176 | // the Vset is a dead-end, i.e., when we are in unreachable code. | ||
| 177 | // Unfortunately, the special-case treatment of reachability for | ||
| 178 | // if-then and if-then-else allows unreachable code in some circumstances, | ||
| 179 | // thus it is possible that no error message will be emitted at all. | ||
| 180 | // While this behavior is strictly incorrect (thus we call this a | ||
| 181 | // workaround), the problematic code is indeed unreachable and will | ||
| 182 | // not be executed. In fact, it will be entirely omitted from the | ||
| 183 | // translated program, and can cause no harm at runtime. A correct | ||
| 184 | // solution would require modifying the representation of the DA/DU | ||
| 185 | // analysis to use finite Vsets only, restricting the universe | ||
| 186 | // of variables about which assertions are made (even in unreachable | ||
| 187 | // code) to variables that are actually in scope. Alternatively, the | ||
| 188 | // Vset extension and the dead-end marker (currently a reserved value | ||
| 189 | // of the extension) could be represented orthogonally. In either case, | ||
| 190 | // 'clearVar' could then be made to work on (non-canonical) dead ends. | ||
| 191 | // See file 'Vset.java'. | ||
| 192 | if (!vset.isReallyDeadEnd() && vset.testVar(thisN)) { | ||
| 193 | env.error(where, "constr.invoke.not.first"); | ||
| 194 | return vset; | ||
| 195 | } | ||
| 196 | vset = vset.addVar(thisN); | ||
| 197 | if (right instanceof SuperExpression) { | ||
| 198 | // supers require this specific kind of checking | ||
| 199 | vset = right.checkAmbigName(env, ctx, vset, exp, this); | ||
| 200 | } else { | ||
| 201 | vset = right.checkValue(env, ctx, vset, exp); | ||
| 202 | } | ||
| 203 | } else { | ||
| 204 | vset = right.checkAmbigName(env, ctx, vset, exp, this); | ||
| 205 | if (right.type == Type.tPackage) { | ||
| 206 | FieldExpression.reportFailedPackagePrefix(env, right); | ||
| 207 | return vset; | ||
| 208 | } | ||
| 209 | if (right instanceof TypeExpression) { | ||
| 210 | staticRef = true; | ||
| 211 | } | ||
| 212 | } | ||
| 213 | if (right.type.isType(TC_CLASS)) { | ||
| 214 | c = env.getClassDeclaration(right.type); | ||
| 215 | } else if (right.type.isType(TC_ARRAY)) { | ||
| 216 | isArray = true; | ||
| 217 | c = env.getClassDeclaration(Type.tObject); | ||
| 218 | } else { | ||
| 219 | if (!right.type.isType(TC_ERROR)) { | ||
| 220 | env.error(where, "invalid.method.invoke", right.type); | ||
| 221 | } | ||
| 222 | return vset; | ||
| 223 | } | ||
| 224 | |||
| 225 | // Normally, the effective accessing class is the innermost | ||
| 226 | // class surrounding the current method call, but, for calls | ||
| 227 | // of the form '<class>.super.<method>(...)', it is <class>. | ||
| 228 | // This allows access to protected members of a superclass | ||
| 229 | // from within a class nested within one of its subclasses. | ||
| 230 | // Otherwise, for example, the call below to 'matchMethod' | ||
| 231 | // may fail due to the rules for visibility of inaccessible | ||
| 232 | // members. For consistency, we treat qualified 'this' in | ||
| 233 | // the same manner, as error diagnostics will be affected. | ||
| 234 | // QUERY: Are there subtle unexplored language issues here? | ||
| 235 | if (right instanceof FieldExpression) { | ||
| 236 | Identifier id = ((FieldExpression)right).id; | ||
| 237 | if (id == idThis) { | ||
| 238 | sourceClass = ((FieldExpression)right).clazz; | ||
| 239 | } else if (id == idSuper) { | ||
| 240 | isSuper = true; | ||
| 241 | sourceClass = ((FieldExpression)right).clazz; | ||
| 242 | } | ||
| 243 | } else if (right instanceof SuperExpression) { | ||
| 244 | isSuper = true; | ||
| 245 | } | ||
| 246 | |||
| 247 | // Fix for 4158650. When we extend a protected inner | ||
| 248 | // class in a different package, we may not have access | ||
| 249 | // to the type of our superclass. Allow the call to | ||
| 250 | // the superclass constructor from within our constructor | ||
| 251 | // Note that this check does not apply to constructor | ||
| 252 | // calls in new instance expressions -- those are part | ||
| 253 | // of NewInstanceExpression#check(). | ||
| 254 | if (id != idInit) { | ||
| 255 | // Required by JLS 6.6.1. Fixes 4143715. | ||
| 256 | // (See also 4094658.) | ||
| 257 | if (!FieldExpression.isTypeAccessible(where, env, | ||
| 258 | right.type, | ||
| 259 | sourceClass)) { | ||
| 260 | ClassDeclaration cdecl = | ||
| 261 | sourceClass.getClassDeclaration(); | ||
| 262 | if (staticRef) { | ||
| 263 | env.error(where, "no.type.access", | ||
| 264 | id, right.type.toString(), cdecl); | ||
| 265 | } else { | ||
| 266 | env.error(where, "cant.access.member.type", | ||
| 267 | id, right.type.toString(), cdecl); | ||
| 268 | } | ||
| 269 | } | ||
| 270 | } | ||
| 271 | } | ||
| 272 | |||
| 273 | // Compose a list of argument types | ||
| 274 | boolean hasErrors = false; | ||
| 275 | |||
| 276 | // "this" is not defined during argument checking | ||
| 277 | if (id.equals(idInit)) { | ||
| 278 | vset = vset.clearVar(ctx.getThisNumber()); | ||
| 279 | } | ||
| 280 | |||
| 281 | for (int i = 0 ; i < args.length ; i++) { | ||
| 282 | vset = args[i].checkValue(env, ctx, vset, exp); | ||
| 283 | argTypes[i] = args[i].type; | ||
| 284 | hasErrors = hasErrors || argTypes[i].isType(TC_ERROR); | ||
| 285 | } | ||
| 286 | |||
| 287 | // "this" is defined after the constructor invocation | ||
| 288 | if (id.equals(idInit)) { | ||
| 289 | vset = vset.addVar(ctx.getThisNumber()); | ||
| 290 | } | ||
| 291 | |||
| 292 | // Check if there are any type errors in the arguments | ||
| 293 | if (hasErrors) { | ||
| 294 | return vset; | ||
| 295 | } | ||
| 296 | |||
| 297 | // Get the method field, given the argument types | ||
| 298 | clazz = c.getClassDefinition(env); | ||
| 299 | |||
| 300 | if (field == null) { | ||
| 301 | |||
| 302 | field = clazz.matchMethod(env, sourceClass, id, argTypes); | ||
| 303 | |||
| 304 | if (field == null) { | ||
| 305 | if (id.equals(idInit)) { | ||
| 306 | if (diagnoseMismatch(env, args, argTypes)) | ||
| 307 | return vset; | ||
| 308 | String sig = clazz.getName().getName().toString(); | ||
| 309 | sig = Type.tMethod(Type.tError, argTypes).typeString(sig, false, false); | ||
| 310 | env.error(where, "unmatched.constr", sig, c); | ||
| 311 | return vset; | ||
| 312 | } | ||
| 313 | String sig = id.toString(); | ||
| 314 | sig = Type.tMethod(Type.tError, argTypes).typeString(sig, false, false); | ||
| 315 | if (clazz.findAnyMethod(env, id) == null) { | ||
| 316 | if (ctx.getField(env, id) != null) { | ||
| 317 | env.error(where, "invalid.method", id, c); | ||
| 318 | } else { | ||
| 319 | env.error(where, "undef.meth", sig, c); | ||
| 320 | } | ||
| 321 | } else if (diagnoseMismatch(env, args, argTypes)) { | ||
| 322 | } else { | ||
| 323 | env.error(where, "unmatched.meth", sig, c); | ||
| 324 | } | ||
| 325 | return vset; | ||
| 326 | } | ||
| 327 | |||
| 328 | } | ||
| 329 | |||
| 330 | type = field.getType().getReturnType(); | ||
| 331 | |||
| 332 | // Make sure that static references are allowed | ||
| 333 | if (staticRef && !field.isStatic()) { | ||
| 334 | env.error(where, "no.static.meth.access", | ||
| 335 | field, field.getClassDeclaration()); | ||
| 336 | return vset; | ||
| 337 | } | ||
| 338 | |||
| 339 | if (field.isProtected() | ||
| 340 | && !(right == null) | ||
| 341 | && !(right instanceof SuperExpression | ||
| 342 | // Extension of JLS 6.6.2 for qualified 'super'. | ||
| 343 | || (right instanceof FieldExpression && | ||
| 344 | ((FieldExpression)right).id == idSuper)) | ||
| 345 | && !sourceClass.protectedAccess(env, field, right.type)) { | ||
| 346 | env.error(where, "invalid.protected.method.use", | ||
| 347 | field.getName(), field.getClassDeclaration(), | ||
| 348 | right.type); | ||
| 349 | return vset; | ||
| 350 | } | ||
| 351 | |||
| 352 | // In <class>.super.<method>(), we cannot simply evaluate | ||
| 353 | // <class>.super to an object reference (as we would for | ||
| 354 | // <class>.super.<field>) and then perform an 'invokespecial'. | ||
| 355 | // An 'invokespecial' must be performed from within (a subclass of) | ||
| 356 | // the class in which the target method is located. | ||
| 357 | if (right instanceof FieldExpression && | ||
| 358 | ((FieldExpression)right).id == idSuper) { | ||
| 359 | if (!field.isPrivate()) { | ||
| 360 | // The private case is handled below. | ||
| 361 | // Use an access method unless the effective accessing class | ||
| 362 | // (the class qualifying the 'super') is the same as the | ||
| 363 | // immediately enclosing class, i.e., the qualification was | ||
| 364 | // unnecessary. | ||
| 365 | if (sourceClass != ctxClass) { | ||
| 366 | implMethod = sourceClass.getAccessMember(env, ctx, field, true); | ||
| 367 | } | ||
| 368 | } | ||
| 369 | } | ||
| 370 | |||
| 371 | // Access method for private field if not in the same class. | ||
| 372 | if (implMethod == null && field.isPrivate()) { | ||
| 373 | ClassDefinition cdef = field.getClassDefinition(); | ||
| 374 | if (cdef != ctxClass) { | ||
| 375 | implMethod = cdef.getAccessMember(env, ctx, field, false); | ||
| 376 | } | ||
| 377 | } | ||
| 378 | |||
| 379 | // Make sure that we are not invoking an abstract method | ||
| 380 | if (field.isAbstract() && (right != null) && (right.op == SUPER)) { | ||
| 381 | env.error(where, "invoke.abstract", field, field.getClassDeclaration()); | ||
| 382 | return vset; | ||
| 383 | } | ||
| 384 | |||
| 385 | if (field.reportDeprecated(env)) { | ||
| 386 | if (field.isConstructor()) { | ||
| 387 | env.error(where, "warn.constr.is.deprecated", field); | ||
| 388 | } else { | ||
| 389 | env.error(where, "warn.meth.is.deprecated", | ||
| 390 | field, field.getClassDefinition()); | ||
| 391 | } | ||
| 392 | } | ||
| 393 | |||
| 394 | // Check for recursive constructor | ||
| 395 | if (field.isConstructor() && ctx.field.equals(field)) { | ||
| 396 | env.error(where, "recursive.constr", field); | ||
| 397 | } | ||
| 398 | |||
| 399 | // When a package-private class defines public or protected | ||
| 400 | // members, those members may sometimes be accessed from | ||
| 401 | // outside of the package in public subclasses. In these | ||
| 402 | // cases, we need to massage the method call to refer to | ||
| 403 | // to an accessible subclass rather than the package-private | ||
| 404 | // parent class. Part of fix for 4135692. | ||
| 405 | |||
| 406 | // Find out if the class which contains this method | ||
| 407 | // call has access to the class which declares the | ||
| 408 | // public or protected method referent. | ||
| 409 | // We don't perform this translation on constructor calls. | ||
| 410 | if (sourceClass == ctxClass) { | ||
| 411 | ClassDefinition declarer = field.getClassDefinition(); | ||
| 412 | if (!field.isConstructor() && | ||
| 413 | declarer.isPackagePrivate() && | ||
| 414 | !declarer.getName().getQualifier() | ||
| 415 | .equals(sourceClass.getName().getQualifier())) { | ||
| 416 | |||
| 417 | //System.out.println("The access of member " + | ||
| 418 | // field + " declared in class " + | ||
| 419 | // declarer + | ||
| 420 | // " is not allowed by the VM from class " + | ||
| 421 | // accessor + | ||
| 422 | // ". Replacing with an access of class " + | ||
| 423 | // clazz); | ||
| 424 | |||
| 425 | // We cannot make this access at the VM level. | ||
| 426 | // Construct a member which will stand for this | ||
| 427 | // method in clazz and set `field' to refer to it. | ||
| 428 | field = | ||
| 429 | MemberDefinition.makeProxyMember(field, clazz, env); | ||
| 430 | } | ||
| 431 | } | ||
| 432 | |||
| 433 | sourceClass.addDependency(field.getClassDeclaration()); | ||
| 434 | if (sourceClass != ctxClass) { | ||
| 435 | ctxClass.addDependency(field.getClassDeclaration()); | ||
| 436 | } | ||
| 437 | |||
| 438 | } catch (ClassNotFound ee) { | ||
| 439 | env.error(where, "class.not.found", ee.name, ctx.field); | ||
| 440 | return vset; | ||
| 441 | |||
| 442 | } catch (AmbiguousMember ee) { | ||
| 443 | env.error(where, "ambig.field", id, ee.field1, ee.field2); | ||
| 444 | return vset; | ||
| 445 | } | ||
| 446 | |||
| 447 | // Make sure it is qualified | ||
| 448 | if ((right == null) && !field.isStatic()) { | ||
| 449 | right = ctx.findOuterLink(env, where, field); | ||
| 450 | vset = right.checkValue(env, ctx, vset, exp); | ||
| 451 | } | ||
| 452 | |||
| 453 | // Cast arguments | ||
| 454 | argTypes = field.getType().getArgumentTypes(); | ||
| 455 | for (int i = 0 ; i < args.length ; i++) { | ||
| 456 | args[i] = convert(env, ctx, argTypes[i], args[i]); | ||
| 457 | } | ||
| 458 | |||
| 459 | if (field.isConstructor()) { | ||
| 460 | MemberDefinition m = field; | ||
| 461 | if (implMethod != null) { | ||
| 462 | m = implMethod; | ||
| 463 | } | ||
| 464 | int nargs = args.length; | ||
| 465 | Expression[] newargs = args; | ||
| 466 | if (nargs > this.args.length) { | ||
| 467 | // Argument was added above. | ||
| 468 | // Maintain the model for hidden outer args in outer.super(...): | ||
| 469 | Expression rightI; | ||
| 470 | if (right instanceof SuperExpression) { | ||
| 471 | rightI = new SuperExpression(right.where, ctx); | ||
| 472 | ((SuperExpression)right).outerArg = args[0]; | ||
| 473 | } else if (right instanceof ThisExpression) { | ||
| 474 | rightI = new ThisExpression(right.where, ctx); | ||
| 475 | } else { | ||
| 476 | throw new CompilerError("this.init"); | ||
| 477 | } | ||
| 478 | if (implMethod != null) { | ||
| 479 | // Need dummy argument for access method. | ||
| 480 | // Dummy argument follows outer instance link. | ||
| 481 | // Leave 'this.args' equal to 'newargs' but | ||
| 482 | // without the outer instance link. | ||
| 483 | newargs = new Expression[nargs+1]; | ||
| 484 | this.args = new Expression[nargs]; | ||
| 485 | newargs[0] = args[0]; // outer instance | ||
| 486 | this.args[0] = newargs[1] = new NullExpression(where); // dummy argument | ||
| 487 | for (int i = 1 ; i < nargs ; i++) { | ||
| 488 | this.args[i] = newargs[i+1] = args[i]; | ||
| 489 | } | ||
| 490 | } else { | ||
| 491 | // Strip outer instance link from 'this.args'. | ||
| 492 | // ASSERT(this.arg.length == nargs-1); | ||
| 493 | for (int i = 1 ; i < nargs ; i++) { | ||
| 494 | this.args[i-1] = args[i]; | ||
| 495 | } | ||
| 496 | } | ||
| 497 | implementation = new MethodExpression(where, rightI, m, newargs); | ||
| 498 | implementation.type = type; // Is this needed? | ||
| 499 | } else { | ||
| 500 | // No argument was added. | ||
| 501 | if (implMethod != null) { | ||
| 502 | // Need dummy argument for access method. | ||
| 503 | // Dummy argument is first, as there is no outer instance link. | ||
| 504 | newargs = new Expression[nargs+1]; | ||
| 505 | newargs[0] = new NullExpression(where); | ||
| 506 | for (int i = 0 ; i < nargs ; i++) { | ||
| 507 | newargs[i+1] = args[i]; | ||
| 508 | } | ||
| 509 | } | ||
| 510 | implementation = new MethodExpression(where, right, m, newargs); | ||
| 511 | } | ||
| 512 | } else { | ||
| 513 | // Have ordinary method. | ||
| 514 | // Argument should have been added only for a constructor. | ||
| 515 | if (args.length > this.args.length) { | ||
| 516 | throw new CompilerError("method arg"); | ||
| 517 | } | ||
| 518 | if (implMethod != null) { | ||
| 519 | //System.out.println("Calling " + field + " via " + implMethod); | ||
| 520 | Expression oldargs[] = this.args; | ||
| 521 | if (field.isStatic()) { | ||
| 522 | Expression call = new MethodExpression(where, null, implMethod, oldargs); | ||
| 523 | implementation = new CommaExpression(where, right, call); | ||
| 524 | } else { | ||
| 525 | // Access method needs an explicit 'this' pointer. | ||
| 526 | int nargs = oldargs.length; | ||
| 527 | Expression newargs[] = new Expression[nargs+1]; | ||
| 528 | newargs[0] = right; | ||
| 529 | for (int i = 0; i < nargs; i++) { | ||
| 530 | newargs[i+1] = oldargs[i]; | ||
| 531 | } | ||
| 532 | implementation = new MethodExpression(where, null, implMethod, newargs); | ||
| 533 | } | ||
| 534 | } | ||
| 535 | } | ||
| 536 | |||
| 537 | // Follow super() by variable initializations | ||
| 538 | if (ctx.field.isConstructor() && | ||
| 539 | field.isConstructor() && (right != null) && (right.op == SUPER)) { | ||
| 540 | Expression e = makeVarInits(env, ctx); | ||
| 541 | if (e != null) { | ||
| 542 | if (implementation == null) | ||
| 543 | implementation = (Expression)this.clone(); | ||
| 544 | implementation = new CommaExpression(where, implementation, e); | ||
| 545 | } | ||
| 546 | } | ||
| 547 | |||
| 548 | // Throw the declared exceptions. | ||
| 549 | ClassDeclaration exceptions[] = field.getExceptions(env); | ||
| 550 | if (isArray && (field.getName() == idClone) && | ||
| 551 | (field.getType().getArgumentTypes().length == 0)) { | ||
| 552 | /* Arrays pretend that they have "public Object clone()" that doesn't | ||
| 553 | * throw anything, according to the language spec. | ||
| 554 | */ | ||
| 555 | exceptions = new ClassDeclaration[0]; | ||
| 556 | /* See if there's a bogus catch for it, to issue a warning. */ | ||
| 557 | for (Context p = ctx; p != null; p = p.prev) { | ||
| 558 | if (p.node != null && p.node.op == TRY) { | ||
| 559 | ((TryStatement) p.node).arrayCloneWhere = where; | ||
| 560 | } | ||
| 561 | } | ||
| 562 | } | ||
| 563 | for (int i = 0 ; i < exceptions.length ; i++) { | ||
| 564 | if (exp.get(exceptions[i]) == null) { | ||
| 565 | exp.put(exceptions[i], this); | ||
| 566 | } | ||
| 567 | } | ||
| 568 | |||
| 569 | // Mark all blank finals as definitely assigned following 'this(...)'. | ||
| 570 | // Correctness follows inductively from the requirement that all blank finals | ||
| 571 | // be definitely assigned at the completion of every constructor. | ||
| 572 | if (ctx.field.isConstructor() && | ||
| 573 | field.isConstructor() && (right != null) && (right.op == THIS)) { | ||
| 574 | ClassDefinition cls = field.getClassDefinition(); | ||
| 575 | for (MemberDefinition f = cls.getFirstMember() ; f != null ; f = f.getNextMember()) { | ||
| 576 | if (f.isVariable() && f.isBlankFinal() && !f.isStatic()) { | ||
| 577 | // Static variables should also be considered defined as well, but this | ||
| 578 | // is handled in 'SourceClass.checkMembers', and we should not interfere. | ||
| 579 | vset = vset.addVar(ctx.getFieldNumber(f)); | ||
| 580 | } | ||
| 581 | } | ||
| 582 | } | ||
| 583 | |||
| 584 | return vset; | ||
| 585 | } | ||
| 586 | |||
| 587 | /** | ||
| 588 | * Check void expression | ||
| 589 | */ | ||
| 590 | public Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { | ||
| 591 | return checkValue(env, ctx, vset, exp); | ||
| 592 | } | ||
| 593 | |||
| 594 | /** | ||
| 595 | * We're about to report a "unmatched method" error. | ||
| 596 | * Try to issue a better diagnostic by comparing the actual argument types | ||
| 597 | * with the method (or methods) available. | ||
| 598 | * In particular, if there is an argument which fails to match <em>any</em> | ||
| 599 | * method, we report a type mismatch error against that particular argument. | ||
| 600 | * The diagnostic will report a target type taken from one of the methods. | ||
| 601 | * <p> | ||
| 602 | * Return false if we couldn't think of anything smart to say. | ||
| 603 | */ | ||
| 604 | boolean diagnoseMismatch(Environment env, Expression args[], | ||
| 605 | Type argTypes[]) throws ClassNotFound { | ||
| 606 | Type margType[] = new Type[1]; | ||
| 607 | boolean saidSomething = false; | ||
| 608 | int start = 0; | ||
| 609 | while (start < argTypes.length) { | ||
| 610 | int code = clazz.diagnoseMismatch(env, id, argTypes, start, margType); | ||
| 611 | String opName = (id.equals(idInit)) ? "constructor" : opNames[op]; | ||
| 612 | if (code == -2) { | ||
| 613 | env.error(where, "wrong.number.args", opName); | ||
| 614 | saidSomething = true; | ||
| 615 | } | ||
| 616 | if (code < 0) break; | ||
| 617 | int i = code >> 2; | ||
| 618 | boolean castOK = (code & 2) != 0; | ||
| 619 | boolean ambig = (code & 1) != 0; | ||
| 620 | Type targetType = margType[0]; | ||
| 621 | |||
| 622 | // At least one argument is offensive to all overloadings. | ||
| 623 | // targetType is one of the argument types it does not match. | ||
| 624 | String ttype = ""+targetType; | ||
| 625 | |||
| 626 | // The message might be slightly misleading, if there are other | ||
| 627 | // argument types that also would match. Hint at this: | ||
| 628 | //if (ambig) ttype = "{"+ttype+";...}"; | ||
| 629 | |||
| 630 | if (castOK) | ||
| 631 | env.error(args[i].where, "explicit.cast.needed", opName, argTypes[i], ttype); | ||
| 632 | else | ||
| 633 | env.error(args[i].where, "incompatible.type", opName, argTypes[i], ttype); | ||
| 634 | saidSomething = true; | ||
| 635 | start = i+1; // look for other bad arguments, too | ||
| 636 | } | ||
| 637 | return saidSomething; | ||
| 638 | } | ||
| 639 | |||
| 640 | /** | ||
| 641 | * Inline | ||
| 642 | */ | ||
| 643 | static final int MAXINLINECOST = Statement.MAXINLINECOST; | ||
| 644 | |||
| 645 | private | ||
| 646 | Expression inlineMethod(Environment env, Context ctx, Statement s, boolean valNeeded) { | ||
| 647 | if (env.dump()) { | ||
| 648 | System.out.println("INLINE METHOD " + field + " in " + ctx.field); | ||
| 649 | } | ||
| 650 | LocalMember v[] = LocalMember.copyArguments(ctx, field); | ||
| 651 | Statement body[] = new Statement[v.length + 2]; | ||
| 652 | |||
| 653 | int n = 0; | ||
| 654 | if (field.isStatic()) { | ||
| 655 | body[0] = new ExpressionStatement(where, right); | ||
| 656 | } else { | ||
| 657 | if ((right != null) && (right.op == SUPER)) { | ||
| 658 | right = new ThisExpression(right.where, ctx); | ||
| 659 | } | ||
| 660 | body[0] = new VarDeclarationStatement(where, v[n++], right); | ||
| 661 | } | ||
| 662 | for (int i = 0 ; i < args.length ; i++) { | ||
| 663 | body[i + 1] = new VarDeclarationStatement(where, v[n++], args[i]); | ||
| 664 | } | ||
| 665 | //System.out.print("BEFORE:"); s.print(System.out); System.out.println(); | ||
| 666 | // Note: If !valNeeded, then all returns in the body of the method | ||
| 667 | // change to void returns. | ||
| 668 | body[body.length - 1] = (s != null) ? s.copyInline(ctx, valNeeded) : null; | ||
| 669 | //System.out.print("COPY:"); body[body.length - 1].print(System.out); System.out.println(); | ||
| 670 | LocalMember.doneWithArguments(ctx, v); | ||
| 671 | |||
| 672 | // Make sure the type matches what the return statements are returning. | ||
| 673 | Type type = valNeeded ? this.type : Type.tVoid; | ||
| 674 | Expression e = new InlineMethodExpression(where, type, field, new CompoundStatement(where, body)); | ||
| 675 | return valNeeded ? e.inlineValue(env, ctx) : e.inline(env, ctx); | ||
| 676 | } | ||
| 677 | |||
| 678 | public Expression inline(Environment env, Context ctx) { | ||
| 679 | if (implementation != null) | ||
| 680 | return implementation.inline(env, ctx); | ||
| 681 | try { | ||
| 682 | if (right != null) { | ||
| 683 | right = field.isStatic() ? right.inline(env, ctx) : right.inlineValue(env, ctx); | ||
| 684 | } | ||
| 685 | for (int i = 0 ; i < args.length ; i++) { | ||
| 686 | args[i] = args[i].inlineValue(env, ctx); | ||
| 687 | } | ||
| 688 | |||
| 689 | // ctxClass is the current class trying to inline this method | ||
| 690 | ClassDefinition ctxClass = ctx.field.getClassDefinition(); | ||
| 691 | |||
| 692 | Expression e = this; | ||
| 693 | if (env.opt() && field.isInlineable(env, clazz.isFinal()) && | ||
| 694 | |||
| 695 | // Don't inline if a qualified non-static method: the call | ||
| 696 | // itself might throw NullPointerException as a side effect | ||
| 697 | ((right == null) || (right.op==THIS) || field.isStatic()) && | ||
| 698 | |||
| 699 | // We only allow the inlining if the current class can access | ||
| 700 | // the field, the field's class, and right's declared type. | ||
| 701 | ctxClass.permitInlinedAccess(env, | ||
| 702 | field.getClassDeclaration()) && | ||
| 703 | ctxClass.permitInlinedAccess(env, field) && | ||
| 704 | (right==null || ctxClass.permitInlinedAccess(env, | ||
| 705 | env.getClassDeclaration(right.type))) && | ||
| 706 | |||
| 707 | ((id == null) || !id.equals(idInit)) && | ||
| 708 | (!ctx.field.isInitializer()) && ctx.field.isMethod() && | ||
| 709 | (ctx.getInlineMemberContext(field) == null)) { | ||
| 710 | Statement s = (Statement)field.getValue(env); | ||
| 711 | if ((s == null) || | ||
| 712 | (s.costInline(MAXINLINECOST, env, ctx) < MAXINLINECOST)) { | ||
| 713 | e = inlineMethod(env, ctx, s, false); | ||
| 714 | } | ||
| 715 | } | ||
| 716 | return e; | ||
| 717 | |||
| 718 | } catch (ClassNotFound e) { | ||
| 719 | throw new CompilerError(e); | ||
| 720 | } | ||
| 721 | } | ||
| 722 | |||
| 723 | public Expression inlineValue(Environment env, Context ctx) { | ||
| 724 | if (implementation != null) | ||
| 725 | return implementation.inlineValue(env, ctx); | ||
| 726 | try { | ||
| 727 | if (right != null) { | ||
| 728 | right = field.isStatic() ? right.inline(env, ctx) : right.inlineValue(env, ctx); | ||
| 729 | } | ||
| 730 | if (field.getName().equals(idInit)) { | ||
| 731 | ClassDefinition refc = field.getClassDefinition(); | ||
| 732 | UplevelReference r = refc.getReferencesFrozen(); | ||
| 733 | if (r != null) { | ||
| 734 | r.willCodeArguments(env, ctx); | ||
| 735 | } | ||
| 736 | } | ||
| 737 | for (int i = 0 ; i < args.length ; i++) { | ||
| 738 | args[i] = args[i].inlineValue(env, ctx); | ||
| 739 | } | ||
| 740 | |||
| 741 | // ctxClass is the current class trying to inline this method | ||
| 742 | ClassDefinition ctxClass = ctx.field.getClassDefinition(); | ||
| 743 | |||
| 744 | if (env.opt() && field.isInlineable(env, clazz.isFinal()) && | ||
| 745 | |||
| 746 | // Don't inline if a qualified non-static method: the call | ||
| 747 | // itself might throw NullPointerException as a side effect | ||
| 748 | ((right == null) || (right.op==THIS) || field.isStatic()) && | ||
| 749 | |||
| 750 | // We only allow the inlining if the current class can access | ||
| 751 | // the field, the field's class, and right's declared type. | ||
| 752 | ctxClass.permitInlinedAccess(env, | ||
| 753 | field.getClassDeclaration()) && | ||
| 754 | ctxClass.permitInlinedAccess(env, field) && | ||
| 755 | (right==null || ctxClass.permitInlinedAccess(env, | ||
| 756 | env.getClassDeclaration(right.type))) && | ||
| 757 | |||
| 758 | (!ctx.field.isInitializer()) && ctx.field.isMethod() && | ||
| 759 | (ctx.getInlineMemberContext(field) == null)) { | ||
| 760 | Statement s = (Statement)field.getValue(env); | ||
| 761 | if ((s == null) || | ||
| 762 | (s.costInline(MAXINLINECOST, env, ctx) < MAXINLINECOST)) { | ||
| 763 | return inlineMethod(env, ctx, s, true); | ||
| 764 | } | ||
| 765 | } | ||
| 766 | return this; | ||
| 767 | } catch (ClassNotFound e) { | ||
| 768 | throw new CompilerError(e); | ||
| 769 | } | ||
| 770 | } | ||
| 771 | |||
| 772 | public Expression copyInline(Context ctx) { | ||
| 773 | if (implementation != null) | ||
| 774 | return implementation.copyInline(ctx); | ||
| 775 | return super.copyInline(ctx); | ||
| 776 | } | ||
| 777 | |||
| 778 | public int costInline(int thresh, Environment env, Context ctx) { | ||
| 779 | if (implementation != null) | ||
| 780 | return implementation.costInline(thresh, env, ctx); | ||
| 781 | |||
| 782 | // for now, don't allow calls to super() to be inlined. We may fix | ||
| 783 | // this later | ||
| 784 | if ((right != null) && (right.op == SUPER)) { | ||
| 785 | return thresh; | ||
| 786 | } | ||
| 787 | return super.costInline(thresh, env, ctx); | ||
| 788 | } | ||
| 789 | |||
| 790 | /* | ||
| 791 | * Grab all instance initializer code from the class definition, | ||
| 792 | * and return as one bolus. Note that we are assuming the | ||
| 793 | * the relevant fields have already been checked. | ||
| 794 | * (See the pre-pass in SourceClass.checkMembers which ensures this.) | ||
| 795 | */ | ||
| 796 | private Expression makeVarInits(Environment env, Context ctx) { | ||
| 797 | // insert instance initializers | ||
| 798 | ClassDefinition clazz = ctx.field.getClassDefinition(); | ||
| 799 | Expression e = null; | ||
| 800 | for (MemberDefinition f = clazz.getFirstMember() ; f != null ; f = f.getNextMember()) { | ||
| 801 | if ((f.isVariable() || f.isInitializer()) && !f.isStatic()) { | ||
| 802 | try { | ||
| 803 | f.check(env); | ||
| 804 | } catch (ClassNotFound ee) { | ||
| 805 | env.error(f.getWhere(), "class.not.found", ee.name, | ||
| 806 | f.getClassDefinition()); | ||
| 807 | } | ||
| 808 | Expression val = null; | ||
| 809 | if (f.isUplevelValue()) { | ||
| 810 | if (f != clazz.findOuterMember()) { | ||
| 811 | // it's too early to accumulate these | ||
| 812 | continue; | ||
| 813 | } | ||
| 814 | IdentifierExpression arg = | ||
| 815 | new IdentifierExpression(where, f.getName()); | ||
| 816 | if (!arg.bind(env, ctx)) { | ||
| 817 | throw new CompilerError("bind "+arg.id); | ||
| 818 | } | ||
| 819 | val = arg; | ||
| 820 | } else if (f.isInitializer()) { | ||
| 821 | Statement s = (Statement)f.getValue(); | ||
| 822 | val = new InlineMethodExpression(where, Type.tVoid, f, s); | ||
| 823 | } else { | ||
| 824 | val = (Expression)f.getValue(); | ||
| 825 | } | ||
| 826 | // append all initializers to "e": | ||
| 827 | // This section used to check for variables which were | ||
| 828 | // initialized to their default values and elide such | ||
| 829 | // initialization. This is specifically disallowed by | ||
| 830 | // JLS 12.5 numeral 4, which requires a textual ordering | ||
| 831 | // on the execution of initializers. | ||
| 832 | if ((val != null)) { // && !val.equals(0)) { | ||
| 833 | long p = f.getWhere(); | ||
| 834 | val = val.copyInline(ctx); | ||
| 835 | Expression init = val; | ||
| 836 | if (f.isVariable()) { | ||
| 837 | Expression v = new ThisExpression(p, ctx); | ||
| 838 | v = new FieldExpression(p, v, f); | ||
| 839 | init = new AssignExpression(p, v, val); | ||
| 840 | } | ||
| 841 | e = (e == null) ? init : new CommaExpression(p, e, init); | ||
| 842 | } | ||
| 843 | } | ||
| 844 | } | ||
| 845 | return e; | ||
| 846 | } | ||
| 847 | |||
| 848 | /** | ||
| 849 | * Code | ||
| 850 | */ | ||
| 851 | public void codeValue(Environment env, Context ctx, Assembler asm) { | ||
| 852 | if (implementation != null) | ||
| 853 | throw new CompilerError("codeValue"); | ||
| 854 | int i = 0; // argument index | ||
| 855 | if (field.isStatic()) { | ||
| 856 | if (right != null) { | ||
| 857 | right.code(env, ctx, asm); | ||
| 858 | } | ||
| 859 | } else if (right == null) { | ||
| 860 | asm.add(where, opc_aload, new Integer(0)); | ||
| 861 | } else if (right.op == SUPER) { | ||
| 862 | // 'super.<method>(...)', 'super(...)', or '<expr>.super(...)' | ||
| 863 | /***** | ||
| 864 | isSuper = true; | ||
| 865 | *****/ | ||
| 866 | right.codeValue(env, ctx, asm); | ||
| 867 | if (idInit.equals(id)) { | ||
| 868 | // 'super(...)' or '<expr>.super(...)' only | ||
| 869 | ClassDefinition refc = field.getClassDefinition(); | ||
| 870 | UplevelReference r = refc.getReferencesFrozen(); | ||
| 871 | if (r != null) { | ||
| 872 | // When calling a constructor for a class with | ||
| 873 | // embedded uplevel references, add extra arguments. | ||
| 874 | if (r.isClientOuterField()) { | ||
| 875 | // the extra arguments are inserted after this one | ||
| 876 | args[i++].codeValue(env, ctx, asm); | ||
| 877 | } | ||
| 878 | r.codeArguments(env, ctx, asm, where, field); | ||
| 879 | } | ||
| 880 | } | ||
| 881 | } else { | ||
| 882 | right.codeValue(env, ctx, asm); | ||
| 883 | /***** | ||
| 884 | if (right.op == FIELD && | ||
| 885 | ((FieldExpression)right).id == idSuper) { | ||
| 886 | // '<class>.super.<method>(...)' | ||
| 887 | isSuper = true; | ||
| 888 | } | ||
| 889 | *****/ | ||
| 890 | } | ||
| 891 | |||
| 892 | for ( ; i < args.length ; i++) { | ||
| 893 | args[i].codeValue(env, ctx, asm); | ||
| 894 | } | ||
| 895 | |||
| 896 | if (field.isStatic()) { | ||
| 897 | asm.add(where, opc_invokestatic, field); | ||
| 898 | } else if (field.isConstructor() || field.isPrivate() || isSuper) { | ||
| 899 | asm.add(where, opc_invokespecial, field); | ||
| 900 | } else if (field.getClassDefinition().isInterface()) { | ||
| 901 | asm.add(where, opc_invokeinterface, field); | ||
| 902 | } else { | ||
| 903 | asm.add(where, opc_invokevirtual, field); | ||
| 904 | } | ||
| 905 | |||
| 906 | if (right != null && right.op == SUPER && idInit.equals(id)) { | ||
| 907 | // 'super(...)' or '<expr>.super(...)' | ||
| 908 | ClassDefinition refc = ctx.field.getClassDefinition(); | ||
| 909 | UplevelReference r = refc.getReferencesFrozen(); | ||
| 910 | if (r != null) { | ||
| 911 | // After calling a superclass constructor in a class with | ||
| 912 | // embedded uplevel references, initialize uplevel fields. | ||
| 913 | r.codeInitialization(env, ctx, asm, where, field); | ||
| 914 | } | ||
| 915 | } | ||
| 916 | } | ||
| 917 | |||
| 918 | /** | ||
| 919 | * Check if the first thing is a constructor invocation | ||
| 920 | */ | ||
| 921 | public Expression firstConstructor() { | ||
| 922 | return id.equals(idInit) ? this : null; | ||
| 923 | } | ||
| 924 | |||
| 925 | /** | ||
| 926 | |||
| 927 | */ | ||
| 928 | public void print(PrintStream out) { | ||
| 929 | out.print("(" + opNames[op]); | ||
| 930 | if (right != null) { | ||
| 931 | out.print(" "); | ||
| 932 | right.print(out); | ||
| 933 | } | ||
| 934 | out.print(" " + ((id == null) ? idInit : id)); | ||
| 935 | for (int i = 0 ; i < args.length ; i++) { | ||
| 936 | out.print(" "); | ||
| 937 | if (args[i] != null) { | ||
| 938 | args[i].print(out); | ||
| 939 | } else { | ||
| 940 | out.print("<null>"); | ||
| 941 | } | ||
| 942 | } | ||
| 943 | out.print(")"); | ||
| 944 | if (implementation != null) { | ||
| 945 | out.print("/IMPL="); | ||
| 946 | implementation.print(out); | ||
| 947 | } | ||
| 948 | } | ||
| 949 | } | ||