1 /* 2 * Copyright (c) 2005, 2019, 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 com.sun.tools.javac.code; 27 28 import java.util.Arrays; 29 import java.util.EnumSet; 30 import java.util.Map; 31 import java.util.concurrent.ConcurrentHashMap; 32 33 import com.sun.tools.javac.code.Symbol.*; 34 import com.sun.tools.javac.main.Option; 35 import com.sun.tools.javac.util.Context; 36 import com.sun.tools.javac.util.List; 37 import com.sun.tools.javac.util.Options; 38 import com.sun.tools.javac.util.Pair; 39 40 /** 41 * A class for handling -Xlint suboptions and @SuppressWarnings. 42 * 43 * <p><b>This is NOT part of any supported API. 44 * If you write code that depends on this, you do so at your own risk. 45 * This code and its internal interfaces are subject to change or 46 * deletion without notice.</b> 47 */ 48 public class Lint 49 { 50 /** The context key for the root Lint object. */ 51 protected static final Context.Key<Lint> lintKey = new Context.Key<>(); 52 53 /** Get the root Lint instance. */ 54 public static Lint instance(Context context) { 55 Lint instance = context.get(lintKey); 56 if (instance == null) 57 instance = new Lint(context); 58 return instance; 59 } 60 61 /** 62 * Returns the result of combining the values in this object with 63 * the given annotation. 64 */ 65 public Lint augment(Attribute.Compound attr) { 66 return augmentor.augment(this, attr); 67 } 68 69 70 /** 71 * Returns the result of combining the values in this object with 72 * the metadata on the given symbol. 73 */ 74 public Lint augment(Symbol sym) { 75 Lint l = augmentor.augment(this, sym.getDeclarationAttributes()); 76 if (sym.isDeprecated()) { 77 if (l == this) 78 l = new Lint(this); 79 l.values.remove(LintCategory.DEPRECATION); 80 l.suppressedValues.add(LintCategory.DEPRECATION); 81 } 82 return l; 83 } 84 85 /** 86 * Returns a new Lint that has the given LintCategorys suppressed. 87 * @param lc one or more categories to be suppressed 88 */ 89 public Lint suppress(LintCategory... lc) { 90 Lint l = new Lint(this); 91 l.values.removeAll(Arrays.asList(lc)); 92 l.suppressedValues.addAll(Arrays.asList(lc)); 93 return l; 94 } 95 96 private final AugmentVisitor augmentor; 97 98 private final EnumSet<LintCategory> values; 99 private final EnumSet<LintCategory> suppressedValues; 100 101 private static final Map<String, LintCategory> map = new ConcurrentHashMap<>(20); 102 103 protected Lint(Context context) { 104 // initialize values according to the lint options 105 Options options = Options.instance(context); 106 107 if (options.isSet(Option.XLINT) || options.isSet(Option.XLINT_CUSTOM, "all")) { 108 // If -Xlint or -Xlint:all is given, enable all categories by default 109 values = EnumSet.allOf(LintCategory.class); 110 } else if (options.isSet(Option.XLINT_CUSTOM, "none")) { 111 // if -Xlint:none is given, disable all categories by default 112 values = EnumSet.noneOf(LintCategory.class); 113 } else { 114 // otherwise, enable on-by-default categories 115 values = EnumSet.noneOf(LintCategory.class); 116 117 Source source = Source.instance(context); 118 if (source.compareTo(Source.JDK9) >= 0) { 119 values.add(LintCategory.DEP_ANN); 120 } 121 values.add(LintCategory.REQUIRES_TRANSITIVE_AUTOMATIC); 122 values.add(LintCategory.OPENS); 123 values.add(LintCategory.MODULE); 124 values.add(LintCategory.REMOVAL); 125 if (!options.isSet(Option.PREVIEW)) { 126 values.add(LintCategory.PREVIEW); 127 } 128 } 129 130 // Look for specific overrides 131 for (LintCategory lc : LintCategory.values()) { 132 if (options.isSet(Option.XLINT_CUSTOM, lc.option)) { 133 values.add(lc); 134 } else if (options.isSet(Option.XLINT_CUSTOM, "-" + lc.option)) { 135 values.remove(lc); 136 } 137 } 138 139 suppressedValues = EnumSet.noneOf(LintCategory.class); 140 141 context.put(lintKey, this); 142 augmentor = new AugmentVisitor(context); 143 } 144 145 protected Lint(Lint other) { 146 this.augmentor = other.augmentor; 147 this.values = other.values.clone(); 148 this.suppressedValues = other.suppressedValues.clone(); 149 } 150 151 @Override 152 public String toString() { 153 return "Lint:[values" + values + " suppressedValues" + suppressedValues + "]"; 154 } 155 156 /** 157 * Categories of warnings that can be generated by the compiler. 158 */ 159 public enum LintCategory { 160 /** 161 * Warn when code refers to a auxiliary class that is hidden in a source file (ie source file name is 162 * different from the class name, and the type is not properly nested) and the referring code 163 * is not located in the same source file. 164 */ 165 AUXILIARYCLASS("auxiliaryclass"), 166 167 /** 168 * Warn about use of unnecessary casts. 169 */ 170 CAST("cast"), 171 172 /** 173 * Warn about issues related to classfile contents 174 */ 175 CLASSFILE("classfile"), 176 177 /** 178 * Warn about use of deprecated items. 179 */ 180 DEPRECATION("deprecation"), 181 182 /** 183 * Warn about compiler generation of a default constructor. 184 */ 185 DEFAULT_CTOR("default-ctor"), 186 187 /** 188 * Warn about items which are documented with an {@code @deprecated} JavaDoc 189 * comment, but which do not have {@code @Deprecated} annotation. 190 */ 191 DEP_ANN("dep-ann"), 192 193 /** 194 * Warn about division by constant integer 0. 195 */ 196 DIVZERO("divzero"), 197 198 /** 199 * Warn about empty statement after if. 200 */ 201 EMPTY("empty"), 202 203 /** 204 * Warn about issues regarding module exports. 205 */ 206 EXPORTS("exports"), 207 208 /** 209 * Warn about falling through from one case of a switch statement to the next. 210 */ 211 FALLTHROUGH("fallthrough"), 212 213 /** 214 * Warn about finally clauses that do not terminate normally. 215 */ 216 FINALLY("finally"), 217 218 /** 219 * Warn about module system related issues. 220 */ 221 MODULE("module"), 222 223 /** 224 * Warn about issues regarding module opens. 225 */ 226 OPENS("opens"), 227 228 /** 229 * Warn about issues relating to use of command line options 230 */ 231 OPTIONS("options"), 232 233 /** 234 * Warn about issues regarding method overloads. 235 */ 236 OVERLOADS("overloads"), 237 238 /** 239 * Warn about issues regarding method overrides. 240 */ 241 OVERRIDES("overrides"), 242 243 /** 244 * Warn about invalid path elements on the command line. 245 * Such warnings cannot be suppressed with the SuppressWarnings 246 * annotation. 247 */ 248 PATH("path"), 249 250 /** 251 * Warn about issues regarding annotation processing. 252 */ 253 PROCESSING("processing"), 254 255 /** 256 * Warn about unchecked operations on raw types. 257 */ 258 RAW("rawtypes"), 259 260 /** 261 * Warn about use of deprecated-for-removal items. 262 */ 263 REMOVAL("removal"), 264 265 /** 266 * Warn about use of automatic modules in the requires clauses. 267 */ 268 REQUIRES_AUTOMATIC("requires-automatic"), 269 270 /** 271 * Warn about automatic modules in requires transitive. 272 */ 273 REQUIRES_TRANSITIVE_AUTOMATIC("requires-transitive-automatic"), 274 275 /** 276 * Warn about Serializable classes that do not provide a serial version ID. 277 */ 278 SERIAL("serial"), 279 280 /** 281 * Warn about issues relating to use of statics 282 */ 283 STATIC("static"), 284 285 /** 286 * Warn about issues relating to use of text blocks 287 */ 288 TEXT_BLOCKS("text-blocks"), 289 290 /** 291 * Warn about issues relating to use of try blocks (i.e. try-with-resources) 292 */ 293 TRY("try"), 294 295 /** 296 * Warn about unchecked operations on raw types. 297 */ 298 UNCHECKED("unchecked"), 299 300 /** 301 * Warn about potentially unsafe vararg methods 302 */ 303 VARARGS("varargs"), 304 305 /** 306 * Warn about use of preview features. 307 */ 308 PREVIEW("preview"); 309 310 LintCategory(String option) { 311 this(option, false); 312 } 313 314 LintCategory(String option, boolean hidden) { 315 this.option = option; 316 this.hidden = hidden; 317 map.put(option, this); 318 } 319 320 static LintCategory get(String option) { 321 return map.get(option); 322 } 323 324 public final String option; 325 public final boolean hidden; 326 } 327 328 /** 329 * Checks if a warning category is enabled. A warning category may be enabled 330 * on the command line, or by default, and can be temporarily disabled with 331 * the SuppressWarnings annotation. 332 */ 333 public boolean isEnabled(LintCategory lc) { 334 return values.contains(lc); 335 } 336 337 /** 338 * Checks is a warning category has been specifically suppressed, by means 339 * of the SuppressWarnings annotation, or, in the case of the deprecated 340 * category, whether it has been implicitly suppressed by virtue of the 341 * current entity being itself deprecated. 342 */ 343 public boolean isSuppressed(LintCategory lc) { 344 return suppressedValues.contains(lc); 345 } 346 347 protected static class AugmentVisitor implements Attribute.Visitor { 348 private final Context context; 349 private Symtab syms; 350 private Lint parent; 351 private Lint lint; 352 353 AugmentVisitor(Context context) { 354 // to break an ugly sequence of initialization dependencies, 355 // we defer the initialization of syms until it is needed 356 this.context = context; 357 } 358 359 Lint augment(Lint parent, Attribute.Compound attr) { 360 initSyms(); 361 this.parent = parent; 362 lint = null; 363 attr.accept(this); 364 return (lint == null ? parent : lint); 365 } 366 367 Lint augment(Lint parent, List<Attribute.Compound> attrs) { 368 initSyms(); 369 this.parent = parent; 370 lint = null; 371 for (Attribute.Compound a: attrs) { 372 a.accept(this); 373 } 374 return (lint == null ? parent : lint); 375 } 376 377 private void initSyms() { 378 if (syms == null) 379 syms = Symtab.instance(context); 380 } 381 382 private void suppress(LintCategory lc) { 383 if (lint == null) 384 lint = new Lint(parent); 385 lint.suppressedValues.add(lc); 386 lint.values.remove(lc); 387 } 388 389 public void visitConstant(Attribute.Constant value) { 390 if (value.type.tsym == syms.stringType.tsym) { 391 LintCategory lc = LintCategory.get((String) (value.value)); 392 if (lc != null) 393 suppress(lc); 394 } 395 } 396 397 public void visitClass(Attribute.Class clazz) { 398 } 399 400 // If we find a @SuppressWarnings annotation, then we continue 401 // walking the tree, in order to suppress the individual warnings 402 // specified in the @SuppressWarnings annotation. 403 public void visitCompound(Attribute.Compound compound) { 404 if (compound.type.tsym == syms.suppressWarningsType.tsym) { 405 for (List<Pair<MethodSymbol,Attribute>> v = compound.values; 406 v.nonEmpty(); v = v.tail) { 407 Pair<MethodSymbol,Attribute> value = v.head; 408 if (value.fst.name.toString().equals("value")) 409 value.snd.accept(this); 410 } 411 412 } 413 } 414 415 public void visitArray(Attribute.Array array) { 416 for (Attribute value : array.values) 417 value.accept(this); 418 } 419 420 public void visitEnum(Attribute.Enum e) { 421 } 422 423 public void visitError(Attribute.Error e) { 424 } 425 } 426 }