Showing the changes to java/pkg/sun/tools/tree/MethodExpression.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,949 @@ | ||
| 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 | +} | |