Mon, 23 Aug 2010 15:13:33 -0700
6976747: JCDiagnostic: replace "boolean mandatory" with new "Set<JCDiagnostic.Flag>"
Reviewed-by: mcimadamore
duke@1 | 1 | /* |
ohair@554 | 2 | * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved. |
duke@1 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@1 | 4 | * |
duke@1 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@1 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ohair@554 | 7 | * published by the Free Software Foundation. Oracle designates this |
duke@1 | 8 | * particular file as subject to the "Classpath" exception as provided |
ohair@554 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
duke@1 | 10 | * |
duke@1 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@1 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@1 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@1 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@1 | 15 | * accompanied this code). |
duke@1 | 16 | * |
duke@1 | 17 | * You should have received a copy of the GNU General Public License version |
duke@1 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@1 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@1 | 20 | * |
ohair@554 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
ohair@554 | 22 | * or visit www.oracle.com if you need additional information or have any |
ohair@554 | 23 | * questions. |
duke@1 | 24 | */ |
duke@1 | 25 | |
duke@1 | 26 | package com.sun.tools.javac.jvm; |
duke@1 | 27 | |
duke@1 | 28 | import com.sun.tools.javac.code.*; |
duke@1 | 29 | |
duke@1 | 30 | import com.sun.tools.javac.code.Symbol.*; |
duke@1 | 31 | import com.sun.tools.javac.code.Type.*; |
duke@1 | 32 | import com.sun.tools.javac.jvm.Code.*; |
duke@1 | 33 | import com.sun.tools.javac.tree.JCTree; |
duke@1 | 34 | |
duke@1 | 35 | import static com.sun.tools.javac.jvm.ByteCodes.*; |
duke@1 | 36 | |
duke@1 | 37 | /** A helper class for code generation. Items are objects |
duke@1 | 38 | * that stand for addressable entities in the bytecode. Each item |
duke@1 | 39 | * supports a fixed protocol for loading the item on the stack, storing |
duke@1 | 40 | * into it, converting it into a jump condition, and several others. |
duke@1 | 41 | * There are many individual forms of items, such as local, static, |
duke@1 | 42 | * indexed, or instance variables, values on the top of stack, the |
duke@1 | 43 | * special values this or super, etc. Individual items are represented as |
duke@1 | 44 | * inner classes in class Items. |
duke@1 | 45 | * |
jjg@581 | 46 | * <p><b>This is NOT part of any supported API. |
jjg@581 | 47 | * If you write code that depends on this, you do so at your own risk. |
duke@1 | 48 | * This code and its internal interfaces are subject to change or |
duke@1 | 49 | * deletion without notice.</b> |
duke@1 | 50 | */ |
duke@1 | 51 | public class Items { |
duke@1 | 52 | |
duke@1 | 53 | /** The current constant pool. |
duke@1 | 54 | */ |
duke@1 | 55 | Pool pool; |
duke@1 | 56 | |
duke@1 | 57 | /** The current code buffer. |
duke@1 | 58 | */ |
duke@1 | 59 | Code code; |
duke@1 | 60 | |
duke@1 | 61 | /** The current symbol table. |
duke@1 | 62 | */ |
duke@1 | 63 | Symtab syms; |
duke@1 | 64 | |
duke@1 | 65 | /** Type utilities. */ |
duke@1 | 66 | Types types; |
duke@1 | 67 | |
duke@1 | 68 | /** Items that exist only once (flyweight pattern). |
duke@1 | 69 | */ |
duke@1 | 70 | private final Item voidItem; |
duke@1 | 71 | private final Item thisItem; |
duke@1 | 72 | private final Item superItem; |
duke@1 | 73 | private final Item[] stackItem = new Item[TypeCodeCount]; |
duke@1 | 74 | |
duke@1 | 75 | public Items(Pool pool, Code code, Symtab syms, Types types) { |
duke@1 | 76 | this.code = code; |
duke@1 | 77 | this.pool = pool; |
duke@1 | 78 | this.types = types; |
duke@1 | 79 | voidItem = new Item(VOIDcode) { |
duke@1 | 80 | public String toString() { return "void"; } |
duke@1 | 81 | }; |
duke@1 | 82 | thisItem = new SelfItem(false); |
duke@1 | 83 | superItem = new SelfItem(true); |
duke@1 | 84 | for (int i = 0; i < VOIDcode; i++) stackItem[i] = new StackItem(i); |
duke@1 | 85 | stackItem[VOIDcode] = voidItem; |
duke@1 | 86 | this.syms = syms; |
duke@1 | 87 | } |
duke@1 | 88 | |
duke@1 | 89 | /** Make a void item |
duke@1 | 90 | */ |
duke@1 | 91 | Item makeVoidItem() { |
duke@1 | 92 | return voidItem; |
duke@1 | 93 | } |
duke@1 | 94 | /** Make an item representing `this'. |
duke@1 | 95 | */ |
duke@1 | 96 | Item makeThisItem() { |
duke@1 | 97 | return thisItem; |
duke@1 | 98 | } |
duke@1 | 99 | |
duke@1 | 100 | /** Make an item representing `super'. |
duke@1 | 101 | */ |
duke@1 | 102 | Item makeSuperItem() { |
duke@1 | 103 | return superItem; |
duke@1 | 104 | } |
duke@1 | 105 | |
duke@1 | 106 | /** Make an item representing a value on stack. |
duke@1 | 107 | * @param type The value's type. |
duke@1 | 108 | */ |
duke@1 | 109 | Item makeStackItem(Type type) { |
duke@1 | 110 | return stackItem[Code.typecode(type)]; |
duke@1 | 111 | } |
duke@1 | 112 | |
duke@1 | 113 | /** Make an item representing an indexed expression. |
duke@1 | 114 | * @param type The expression's type. |
duke@1 | 115 | */ |
duke@1 | 116 | Item makeIndexedItem(Type type) { |
duke@1 | 117 | return new IndexedItem(type); |
duke@1 | 118 | } |
duke@1 | 119 | |
duke@1 | 120 | /** Make an item representing a local variable. |
duke@1 | 121 | * @param v The represented variable. |
duke@1 | 122 | */ |
duke@1 | 123 | LocalItem makeLocalItem(VarSymbol v) { |
duke@1 | 124 | return new LocalItem(v.erasure(types), v.adr); |
duke@1 | 125 | } |
duke@1 | 126 | |
duke@1 | 127 | /** Make an item representing a local anonymous variable. |
duke@1 | 128 | * @param type The represented variable's type. |
duke@1 | 129 | * @param reg The represented variable's register. |
duke@1 | 130 | */ |
duke@1 | 131 | private LocalItem makeLocalItem(Type type, int reg) { |
duke@1 | 132 | return new LocalItem(type, reg); |
duke@1 | 133 | } |
duke@1 | 134 | |
duke@1 | 135 | /** Make an item representing a static variable or method. |
duke@1 | 136 | * @param member The represented symbol. |
duke@1 | 137 | */ |
duke@1 | 138 | Item makeStaticItem(Symbol member) { |
duke@1 | 139 | return new StaticItem(member); |
duke@1 | 140 | } |
duke@1 | 141 | |
jrose@267 | 142 | /** Make an item representing a dynamically invoked method. |
jrose@267 | 143 | * @param member The represented symbol. |
jrose@267 | 144 | */ |
jrose@267 | 145 | Item makeDynamicItem(Symbol member) { |
jrose@267 | 146 | return new DynamicItem(member); |
jrose@267 | 147 | } |
jrose@267 | 148 | |
duke@1 | 149 | /** Make an item representing an instance variable or method. |
duke@1 | 150 | * @param member The represented symbol. |
duke@1 | 151 | * @param nonvirtual Is the reference not virtual? (true for constructors |
duke@1 | 152 | * and private members). |
duke@1 | 153 | */ |
duke@1 | 154 | Item makeMemberItem(Symbol member, boolean nonvirtual) { |
duke@1 | 155 | return new MemberItem(member, nonvirtual); |
duke@1 | 156 | } |
duke@1 | 157 | |
duke@1 | 158 | /** Make an item representing a literal. |
duke@1 | 159 | * @param type The literal's type. |
duke@1 | 160 | * @param value The literal's value. |
duke@1 | 161 | */ |
duke@1 | 162 | Item makeImmediateItem(Type type, Object value) { |
duke@1 | 163 | return new ImmediateItem(type, value); |
duke@1 | 164 | } |
duke@1 | 165 | |
duke@1 | 166 | /** Make an item representing an assignment expression. |
duke@1 | 167 | * @param lhs The item representing the assignment's left hand side. |
duke@1 | 168 | */ |
duke@1 | 169 | Item makeAssignItem(Item lhs) { |
duke@1 | 170 | return new AssignItem(lhs); |
duke@1 | 171 | } |
duke@1 | 172 | |
duke@1 | 173 | /** Make an item representing a conditional or unconditional jump. |
duke@1 | 174 | * @param opcode The jump's opcode. |
duke@1 | 175 | * @param trueJumps A chain encomassing all jumps that can be taken |
duke@1 | 176 | * if the condition evaluates to true. |
duke@1 | 177 | * @param falseJumps A chain encomassing all jumps that can be taken |
duke@1 | 178 | * if the condition evaluates to false. |
duke@1 | 179 | */ |
duke@1 | 180 | CondItem makeCondItem(int opcode, Chain trueJumps, Chain falseJumps) { |
duke@1 | 181 | return new CondItem(opcode, trueJumps, falseJumps); |
duke@1 | 182 | } |
duke@1 | 183 | |
duke@1 | 184 | /** Make an item representing a conditional or unconditional jump. |
duke@1 | 185 | * @param opcode The jump's opcode. |
duke@1 | 186 | */ |
duke@1 | 187 | CondItem makeCondItem(int opcode) { |
duke@1 | 188 | return makeCondItem(opcode, null, null); |
duke@1 | 189 | } |
duke@1 | 190 | |
duke@1 | 191 | /** The base class of all items, which implements default behavior. |
duke@1 | 192 | */ |
duke@1 | 193 | abstract class Item { |
duke@1 | 194 | |
duke@1 | 195 | /** The type code of values represented by this item. |
duke@1 | 196 | */ |
duke@1 | 197 | int typecode; |
duke@1 | 198 | |
duke@1 | 199 | Item(int typecode) { |
duke@1 | 200 | this.typecode = typecode; |
duke@1 | 201 | } |
duke@1 | 202 | |
duke@1 | 203 | /** Generate code to load this item onto stack. |
duke@1 | 204 | */ |
duke@1 | 205 | Item load() { |
duke@1 | 206 | throw new AssertionError(); |
duke@1 | 207 | } |
duke@1 | 208 | |
duke@1 | 209 | /** Generate code to store top of stack into this item. |
duke@1 | 210 | */ |
duke@1 | 211 | void store() { |
duke@1 | 212 | throw new AssertionError("store unsupported: " + this); |
duke@1 | 213 | } |
duke@1 | 214 | |
duke@1 | 215 | /** Generate code to invoke method represented by this item. |
duke@1 | 216 | */ |
duke@1 | 217 | Item invoke() { |
duke@1 | 218 | throw new AssertionError(this); |
duke@1 | 219 | } |
duke@1 | 220 | |
duke@1 | 221 | /** Generate code to use this item twice. |
duke@1 | 222 | */ |
duke@1 | 223 | void duplicate() {} |
duke@1 | 224 | |
duke@1 | 225 | /** Generate code to avoid having to use this item. |
duke@1 | 226 | */ |
duke@1 | 227 | void drop() {} |
duke@1 | 228 | |
duke@1 | 229 | /** Generate code to stash a copy of top of stack - of typecode toscode - |
duke@1 | 230 | * under this item. |
duke@1 | 231 | */ |
duke@1 | 232 | void stash(int toscode) { |
duke@1 | 233 | stackItem[toscode].duplicate(); |
duke@1 | 234 | } |
duke@1 | 235 | |
duke@1 | 236 | /** Generate code to turn item into a testable condition. |
duke@1 | 237 | */ |
duke@1 | 238 | CondItem mkCond() { |
duke@1 | 239 | load(); |
duke@1 | 240 | return makeCondItem(ifne); |
duke@1 | 241 | } |
duke@1 | 242 | |
duke@1 | 243 | /** Generate code to coerce item to given type code. |
duke@1 | 244 | * @param targetcode The type code to coerce to. |
duke@1 | 245 | */ |
duke@1 | 246 | Item coerce(int targetcode) { |
duke@1 | 247 | if (typecode == targetcode) |
duke@1 | 248 | return this; |
duke@1 | 249 | else { |
duke@1 | 250 | load(); |
duke@1 | 251 | int typecode1 = Code.truncate(typecode); |
duke@1 | 252 | int targetcode1 = Code.truncate(targetcode); |
duke@1 | 253 | if (typecode1 != targetcode1) { |
duke@1 | 254 | int offset = targetcode1 > typecode1 ? targetcode1 - 1 |
duke@1 | 255 | : targetcode1; |
duke@1 | 256 | code.emitop0(i2l + typecode1 * 3 + offset); |
duke@1 | 257 | } |
duke@1 | 258 | if (targetcode != targetcode1) { |
duke@1 | 259 | code.emitop0(int2byte + targetcode - BYTEcode); |
duke@1 | 260 | } |
duke@1 | 261 | return stackItem[targetcode]; |
duke@1 | 262 | } |
duke@1 | 263 | } |
duke@1 | 264 | |
duke@1 | 265 | /** Generate code to coerce item to given type. |
duke@1 | 266 | * @param targettype The type to coerce to. |
duke@1 | 267 | */ |
duke@1 | 268 | Item coerce(Type targettype) { |
duke@1 | 269 | return coerce(Code.typecode(targettype)); |
duke@1 | 270 | } |
duke@1 | 271 | |
duke@1 | 272 | /** Return the width of this item on stack as a number of words. |
duke@1 | 273 | */ |
duke@1 | 274 | int width() { |
duke@1 | 275 | return 0; |
duke@1 | 276 | } |
duke@1 | 277 | |
duke@1 | 278 | public abstract String toString(); |
duke@1 | 279 | } |
duke@1 | 280 | |
duke@1 | 281 | /** An item representing a value on stack. |
duke@1 | 282 | */ |
duke@1 | 283 | class StackItem extends Item { |
duke@1 | 284 | |
duke@1 | 285 | StackItem(int typecode) { |
duke@1 | 286 | super(typecode); |
duke@1 | 287 | } |
duke@1 | 288 | |
duke@1 | 289 | Item load() { |
duke@1 | 290 | return this; |
duke@1 | 291 | } |
duke@1 | 292 | |
duke@1 | 293 | void duplicate() { |
duke@1 | 294 | code.emitop0(width() == 2 ? dup2 : dup); |
duke@1 | 295 | } |
duke@1 | 296 | |
duke@1 | 297 | void drop() { |
duke@1 | 298 | code.emitop0(width() == 2 ? pop2 : pop); |
duke@1 | 299 | } |
duke@1 | 300 | |
duke@1 | 301 | void stash(int toscode) { |
duke@1 | 302 | code.emitop0( |
duke@1 | 303 | (width() == 2 ? dup_x2 : dup_x1) + 3 * (Code.width(toscode) - 1)); |
duke@1 | 304 | } |
duke@1 | 305 | |
duke@1 | 306 | int width() { |
duke@1 | 307 | return Code.width(typecode); |
duke@1 | 308 | } |
duke@1 | 309 | |
duke@1 | 310 | public String toString() { |
duke@1 | 311 | return "stack(" + typecodeNames[typecode] + ")"; |
duke@1 | 312 | } |
duke@1 | 313 | } |
duke@1 | 314 | |
duke@1 | 315 | /** An item representing an indexed expression. |
duke@1 | 316 | */ |
duke@1 | 317 | class IndexedItem extends Item { |
duke@1 | 318 | |
duke@1 | 319 | IndexedItem(Type type) { |
duke@1 | 320 | super(Code.typecode(type)); |
duke@1 | 321 | } |
duke@1 | 322 | |
duke@1 | 323 | Item load() { |
duke@1 | 324 | code.emitop0(iaload + typecode); |
duke@1 | 325 | return stackItem[typecode]; |
duke@1 | 326 | } |
duke@1 | 327 | |
duke@1 | 328 | void store() { |
duke@1 | 329 | code.emitop0(iastore + typecode); |
duke@1 | 330 | } |
duke@1 | 331 | |
duke@1 | 332 | void duplicate() { |
duke@1 | 333 | code.emitop0(dup2); |
duke@1 | 334 | } |
duke@1 | 335 | |
duke@1 | 336 | void drop() { |
duke@1 | 337 | code.emitop0(pop2); |
duke@1 | 338 | } |
duke@1 | 339 | |
duke@1 | 340 | void stash(int toscode) { |
duke@1 | 341 | code.emitop0(dup_x2 + 3 * (Code.width(toscode) - 1)); |
duke@1 | 342 | } |
duke@1 | 343 | |
duke@1 | 344 | int width() { |
duke@1 | 345 | return 2; |
duke@1 | 346 | } |
duke@1 | 347 | |
duke@1 | 348 | public String toString() { |
duke@1 | 349 | return "indexed(" + ByteCodes.typecodeNames[typecode] + ")"; |
duke@1 | 350 | } |
duke@1 | 351 | } |
duke@1 | 352 | |
duke@1 | 353 | /** An item representing `this' or `super'. |
duke@1 | 354 | */ |
duke@1 | 355 | class SelfItem extends Item { |
duke@1 | 356 | |
duke@1 | 357 | /** Flag which determines whether this item represents `this' or `super'. |
duke@1 | 358 | */ |
duke@1 | 359 | boolean isSuper; |
duke@1 | 360 | |
duke@1 | 361 | SelfItem(boolean isSuper) { |
duke@1 | 362 | super(OBJECTcode); |
duke@1 | 363 | this.isSuper = isSuper; |
duke@1 | 364 | } |
duke@1 | 365 | |
duke@1 | 366 | Item load() { |
duke@1 | 367 | code.emitop0(aload_0); |
duke@1 | 368 | return stackItem[typecode]; |
duke@1 | 369 | } |
duke@1 | 370 | |
duke@1 | 371 | public String toString() { |
duke@1 | 372 | return isSuper ? "super" : "this"; |
duke@1 | 373 | } |
duke@1 | 374 | } |
duke@1 | 375 | |
duke@1 | 376 | /** An item representing a local variable. |
duke@1 | 377 | */ |
duke@1 | 378 | class LocalItem extends Item { |
duke@1 | 379 | |
duke@1 | 380 | /** The variable's register. |
duke@1 | 381 | */ |
duke@1 | 382 | int reg; |
duke@1 | 383 | |
duke@1 | 384 | /** The variable's type. |
duke@1 | 385 | */ |
duke@1 | 386 | Type type; |
duke@1 | 387 | |
duke@1 | 388 | LocalItem(Type type, int reg) { |
duke@1 | 389 | super(Code.typecode(type)); |
duke@1 | 390 | assert reg >= 0; |
duke@1 | 391 | this.type = type; |
duke@1 | 392 | this.reg = reg; |
duke@1 | 393 | } |
duke@1 | 394 | |
duke@1 | 395 | Item load() { |
duke@1 | 396 | if (reg <= 3) |
duke@1 | 397 | code.emitop0(iload_0 + Code.truncate(typecode) * 4 + reg); |
duke@1 | 398 | else |
duke@1 | 399 | code.emitop1w(iload + Code.truncate(typecode), reg); |
duke@1 | 400 | return stackItem[typecode]; |
duke@1 | 401 | } |
duke@1 | 402 | |
duke@1 | 403 | void store() { |
duke@1 | 404 | if (reg <= 3) |
duke@1 | 405 | code.emitop0(istore_0 + Code.truncate(typecode) * 4 + reg); |
duke@1 | 406 | else |
duke@1 | 407 | code.emitop1w(istore + Code.truncate(typecode), reg); |
duke@1 | 408 | code.setDefined(reg); |
duke@1 | 409 | } |
duke@1 | 410 | |
duke@1 | 411 | void incr(int x) { |
duke@1 | 412 | if (typecode == INTcode && x >= -32768 && x <= 32767) { |
duke@1 | 413 | code.emitop1w(iinc, reg, x); |
duke@1 | 414 | } else { |
duke@1 | 415 | load(); |
duke@1 | 416 | if (x >= 0) { |
duke@1 | 417 | makeImmediateItem(syms.intType, x).load(); |
duke@1 | 418 | code.emitop0(iadd); |
duke@1 | 419 | } else { |
duke@1 | 420 | makeImmediateItem(syms.intType, -x).load(); |
duke@1 | 421 | code.emitop0(isub); |
duke@1 | 422 | } |
duke@1 | 423 | makeStackItem(syms.intType).coerce(typecode); |
duke@1 | 424 | store(); |
duke@1 | 425 | } |
duke@1 | 426 | } |
duke@1 | 427 | |
duke@1 | 428 | public String toString() { |
duke@1 | 429 | return "localItem(type=" + type + "; reg=" + reg + ")"; |
duke@1 | 430 | } |
duke@1 | 431 | } |
duke@1 | 432 | |
duke@1 | 433 | /** An item representing a static variable or method. |
duke@1 | 434 | */ |
duke@1 | 435 | class StaticItem extends Item { |
duke@1 | 436 | |
duke@1 | 437 | /** The represented symbol. |
duke@1 | 438 | */ |
duke@1 | 439 | Symbol member; |
duke@1 | 440 | |
duke@1 | 441 | StaticItem(Symbol member) { |
duke@1 | 442 | super(Code.typecode(member.erasure(types))); |
duke@1 | 443 | this.member = member; |
duke@1 | 444 | } |
duke@1 | 445 | |
duke@1 | 446 | Item load() { |
duke@1 | 447 | code.emitop2(getstatic, pool.put(member)); |
duke@1 | 448 | return stackItem[typecode]; |
duke@1 | 449 | } |
duke@1 | 450 | |
duke@1 | 451 | void store() { |
duke@1 | 452 | code.emitop2(putstatic, pool.put(member)); |
duke@1 | 453 | } |
duke@1 | 454 | |
duke@1 | 455 | Item invoke() { |
duke@1 | 456 | MethodType mtype = (MethodType)member.erasure(types); |
duke@1 | 457 | int rescode = Code.typecode(mtype.restype); |
duke@1 | 458 | code.emitInvokestatic(pool.put(member), mtype); |
duke@1 | 459 | return stackItem[rescode]; |
duke@1 | 460 | } |
duke@1 | 461 | |
duke@1 | 462 | public String toString() { |
duke@1 | 463 | return "static(" + member + ")"; |
duke@1 | 464 | } |
duke@1 | 465 | } |
duke@1 | 466 | |
jrose@267 | 467 | /** An item representing a dynamic call site. |
jrose@267 | 468 | */ |
jrose@267 | 469 | class DynamicItem extends StaticItem { |
jrose@267 | 470 | DynamicItem(Symbol member) { |
jrose@267 | 471 | super(member); |
jrose@267 | 472 | assert member.owner == syms.invokeDynamicType.tsym; |
jrose@267 | 473 | } |
jrose@267 | 474 | |
jrose@267 | 475 | Item load() { |
jrose@267 | 476 | assert false; |
jrose@267 | 477 | return null; |
jrose@267 | 478 | } |
jrose@267 | 479 | |
jrose@267 | 480 | void store() { |
jrose@267 | 481 | assert false; |
jrose@267 | 482 | } |
jrose@267 | 483 | |
jrose@267 | 484 | Item invoke() { |
jrose@267 | 485 | // assert target.hasNativeInvokeDynamic(); |
jrose@267 | 486 | MethodType mtype = (MethodType)member.erasure(types); |
jrose@267 | 487 | int rescode = Code.typecode(mtype.restype); |
jrose@267 | 488 | ClassFile.NameAndType descr = new ClassFile.NameAndType(member.name, mtype); |
jrose@267 | 489 | code.emitInvokedynamic(pool.put(descr), mtype); |
jrose@267 | 490 | return stackItem[rescode]; |
jrose@267 | 491 | } |
jrose@267 | 492 | |
jrose@267 | 493 | public String toString() { |
jrose@267 | 494 | return "dynamic(" + member + ")"; |
jrose@267 | 495 | } |
jrose@267 | 496 | } |
jrose@267 | 497 | |
jrose@267 | 498 | |
duke@1 | 499 | /** An item representing an instance variable or method. |
duke@1 | 500 | */ |
duke@1 | 501 | class MemberItem extends Item { |
duke@1 | 502 | |
duke@1 | 503 | /** The represented symbol. |
duke@1 | 504 | */ |
duke@1 | 505 | Symbol member; |
duke@1 | 506 | |
duke@1 | 507 | /** Flag that determines whether or not access is virtual. |
duke@1 | 508 | */ |
duke@1 | 509 | boolean nonvirtual; |
duke@1 | 510 | |
duke@1 | 511 | MemberItem(Symbol member, boolean nonvirtual) { |
duke@1 | 512 | super(Code.typecode(member.erasure(types))); |
duke@1 | 513 | this.member = member; |
duke@1 | 514 | this.nonvirtual = nonvirtual; |
duke@1 | 515 | } |
duke@1 | 516 | |
duke@1 | 517 | Item load() { |
duke@1 | 518 | code.emitop2(getfield, pool.put(member)); |
duke@1 | 519 | return stackItem[typecode]; |
duke@1 | 520 | } |
duke@1 | 521 | |
duke@1 | 522 | void store() { |
duke@1 | 523 | code.emitop2(putfield, pool.put(member)); |
duke@1 | 524 | } |
duke@1 | 525 | |
duke@1 | 526 | Item invoke() { |
duke@1 | 527 | MethodType mtype = (MethodType)member.externalType(types); |
duke@1 | 528 | int rescode = Code.typecode(mtype.restype); |
duke@1 | 529 | if ((member.owner.flags() & Flags.INTERFACE) != 0) { |
duke@1 | 530 | code.emitInvokeinterface(pool.put(member), mtype); |
duke@1 | 531 | } else if (nonvirtual) { |
duke@1 | 532 | code.emitInvokespecial(pool.put(member), mtype); |
duke@1 | 533 | } else { |
duke@1 | 534 | code.emitInvokevirtual(pool.put(member), mtype); |
duke@1 | 535 | } |
duke@1 | 536 | return stackItem[rescode]; |
duke@1 | 537 | } |
duke@1 | 538 | |
duke@1 | 539 | void duplicate() { |
duke@1 | 540 | stackItem[OBJECTcode].duplicate(); |
duke@1 | 541 | } |
duke@1 | 542 | |
duke@1 | 543 | void drop() { |
duke@1 | 544 | stackItem[OBJECTcode].drop(); |
duke@1 | 545 | } |
duke@1 | 546 | |
duke@1 | 547 | void stash(int toscode) { |
duke@1 | 548 | stackItem[OBJECTcode].stash(toscode); |
duke@1 | 549 | } |
duke@1 | 550 | |
duke@1 | 551 | int width() { |
duke@1 | 552 | return 1; |
duke@1 | 553 | } |
duke@1 | 554 | |
duke@1 | 555 | public String toString() { |
duke@1 | 556 | return "member(" + member + (nonvirtual ? " nonvirtual)" : ")"); |
duke@1 | 557 | } |
duke@1 | 558 | } |
duke@1 | 559 | |
duke@1 | 560 | /** An item representing a literal. |
duke@1 | 561 | */ |
duke@1 | 562 | class ImmediateItem extends Item { |
duke@1 | 563 | |
duke@1 | 564 | /** The literal's value. |
duke@1 | 565 | */ |
duke@1 | 566 | Object value; |
duke@1 | 567 | |
duke@1 | 568 | ImmediateItem(Type type, Object value) { |
duke@1 | 569 | super(Code.typecode(type)); |
duke@1 | 570 | this.value = value; |
duke@1 | 571 | } |
duke@1 | 572 | |
duke@1 | 573 | private void ldc() { |
duke@1 | 574 | int idx = pool.put(value); |
duke@1 | 575 | if (typecode == LONGcode || typecode == DOUBLEcode) { |
duke@1 | 576 | code.emitop2(ldc2w, idx); |
duke@1 | 577 | } else if (idx <= 255) { |
duke@1 | 578 | code.emitop1(ldc1, idx); |
duke@1 | 579 | } else { |
duke@1 | 580 | code.emitop2(ldc2, idx); |
duke@1 | 581 | } |
duke@1 | 582 | } |
duke@1 | 583 | |
duke@1 | 584 | Item load() { |
duke@1 | 585 | switch (typecode) { |
duke@1 | 586 | case INTcode: case BYTEcode: case SHORTcode: case CHARcode: |
duke@1 | 587 | int ival = ((Number)value).intValue(); |
duke@1 | 588 | if (-1 <= ival && ival <= 5) |
duke@1 | 589 | code.emitop0(iconst_0 + ival); |
duke@1 | 590 | else if (Byte.MIN_VALUE <= ival && ival <= Byte.MAX_VALUE) |
duke@1 | 591 | code.emitop1(bipush, ival); |
duke@1 | 592 | else if (Short.MIN_VALUE <= ival && ival <= Short.MAX_VALUE) |
duke@1 | 593 | code.emitop2(sipush, ival); |
duke@1 | 594 | else |
duke@1 | 595 | ldc(); |
duke@1 | 596 | break; |
duke@1 | 597 | case LONGcode: |
duke@1 | 598 | long lval = ((Number)value).longValue(); |
duke@1 | 599 | if (lval == 0 || lval == 1) |
duke@1 | 600 | code.emitop0(lconst_0 + (int)lval); |
duke@1 | 601 | else |
duke@1 | 602 | ldc(); |
duke@1 | 603 | break; |
duke@1 | 604 | case FLOATcode: |
duke@1 | 605 | float fval = ((Number)value).floatValue(); |
duke@1 | 606 | if (isPosZero(fval) || fval == 1.0 || fval == 2.0) |
duke@1 | 607 | code.emitop0(fconst_0 + (int)fval); |
duke@1 | 608 | else { |
duke@1 | 609 | ldc(); |
duke@1 | 610 | } |
duke@1 | 611 | break; |
duke@1 | 612 | case DOUBLEcode: |
duke@1 | 613 | double dval = ((Number)value).doubleValue(); |
duke@1 | 614 | if (isPosZero(dval) || dval == 1.0) |
duke@1 | 615 | code.emitop0(dconst_0 + (int)dval); |
duke@1 | 616 | else |
duke@1 | 617 | ldc(); |
duke@1 | 618 | break; |
duke@1 | 619 | case OBJECTcode: |
duke@1 | 620 | ldc(); |
duke@1 | 621 | break; |
duke@1 | 622 | default: |
duke@1 | 623 | assert false; |
duke@1 | 624 | } |
duke@1 | 625 | return stackItem[typecode]; |
duke@1 | 626 | } |
duke@1 | 627 | //where |
duke@1 | 628 | /** Return true iff float number is positive 0. |
duke@1 | 629 | */ |
duke@1 | 630 | private boolean isPosZero(float x) { |
duke@1 | 631 | return x == 0.0f && 1.0f / x > 0.0f; |
duke@1 | 632 | } |
duke@1 | 633 | /** Return true iff double number is positive 0. |
duke@1 | 634 | */ |
duke@1 | 635 | private boolean isPosZero(double x) { |
duke@1 | 636 | return x == 0.0d && 1.0d / x > 0.0d; |
duke@1 | 637 | } |
duke@1 | 638 | |
duke@1 | 639 | CondItem mkCond() { |
duke@1 | 640 | int ival = ((Number)value).intValue(); |
duke@1 | 641 | return makeCondItem(ival != 0 ? goto_ : dontgoto); |
duke@1 | 642 | } |
duke@1 | 643 | |
duke@1 | 644 | Item coerce(int targetcode) { |
duke@1 | 645 | if (typecode == targetcode) { |
duke@1 | 646 | return this; |
duke@1 | 647 | } else { |
duke@1 | 648 | switch (targetcode) { |
duke@1 | 649 | case INTcode: |
duke@1 | 650 | if (Code.truncate(typecode) == INTcode) |
duke@1 | 651 | return this; |
duke@1 | 652 | else |
duke@1 | 653 | return new ImmediateItem( |
duke@1 | 654 | syms.intType, |
duke@1 | 655 | ((Number)value).intValue()); |
duke@1 | 656 | case LONGcode: |
duke@1 | 657 | return new ImmediateItem( |
duke@1 | 658 | syms.longType, |
duke@1 | 659 | ((Number)value).longValue()); |
duke@1 | 660 | case FLOATcode: |
duke@1 | 661 | return new ImmediateItem( |
duke@1 | 662 | syms.floatType, |
duke@1 | 663 | ((Number)value).floatValue()); |
duke@1 | 664 | case DOUBLEcode: |
duke@1 | 665 | return new ImmediateItem( |
duke@1 | 666 | syms.doubleType, |
duke@1 | 667 | ((Number)value).doubleValue()); |
duke@1 | 668 | case BYTEcode: |
duke@1 | 669 | return new ImmediateItem( |
duke@1 | 670 | syms.byteType, |
duke@1 | 671 | (int)(byte)((Number)value).intValue()); |
duke@1 | 672 | case CHARcode: |
duke@1 | 673 | return new ImmediateItem( |
duke@1 | 674 | syms.charType, |
duke@1 | 675 | (int)(char)((Number)value).intValue()); |
duke@1 | 676 | case SHORTcode: |
duke@1 | 677 | return new ImmediateItem( |
duke@1 | 678 | syms.shortType, |
duke@1 | 679 | (int)(short)((Number)value).intValue()); |
duke@1 | 680 | default: |
duke@1 | 681 | return super.coerce(targetcode); |
duke@1 | 682 | } |
duke@1 | 683 | } |
duke@1 | 684 | } |
duke@1 | 685 | |
duke@1 | 686 | public String toString() { |
duke@1 | 687 | return "immediate(" + value + ")"; |
duke@1 | 688 | } |
duke@1 | 689 | } |
duke@1 | 690 | |
duke@1 | 691 | /** An item representing an assignment expressions. |
duke@1 | 692 | */ |
duke@1 | 693 | class AssignItem extends Item { |
duke@1 | 694 | |
duke@1 | 695 | /** The item representing the assignment's left hand side. |
duke@1 | 696 | */ |
duke@1 | 697 | Item lhs; |
duke@1 | 698 | |
duke@1 | 699 | AssignItem(Item lhs) { |
duke@1 | 700 | super(lhs.typecode); |
duke@1 | 701 | this.lhs = lhs; |
duke@1 | 702 | } |
duke@1 | 703 | |
duke@1 | 704 | Item load() { |
duke@1 | 705 | lhs.stash(typecode); |
duke@1 | 706 | lhs.store(); |
duke@1 | 707 | return stackItem[typecode]; |
duke@1 | 708 | } |
duke@1 | 709 | |
duke@1 | 710 | void duplicate() { |
duke@1 | 711 | load().duplicate(); |
duke@1 | 712 | } |
duke@1 | 713 | |
duke@1 | 714 | void drop() { |
duke@1 | 715 | lhs.store(); |
duke@1 | 716 | } |
duke@1 | 717 | |
duke@1 | 718 | void stash(int toscode) { |
duke@1 | 719 | assert false; |
duke@1 | 720 | } |
duke@1 | 721 | |
duke@1 | 722 | int width() { |
duke@1 | 723 | return lhs.width() + Code.width(typecode); |
duke@1 | 724 | } |
duke@1 | 725 | |
duke@1 | 726 | public String toString() { |
duke@1 | 727 | return "assign(lhs = " + lhs + ")"; |
duke@1 | 728 | } |
duke@1 | 729 | } |
duke@1 | 730 | |
duke@1 | 731 | /** An item representing a conditional or unconditional jump. |
duke@1 | 732 | */ |
duke@1 | 733 | class CondItem extends Item { |
duke@1 | 734 | |
duke@1 | 735 | /** A chain encomassing all jumps that can be taken |
duke@1 | 736 | * if the condition evaluates to true. |
duke@1 | 737 | */ |
duke@1 | 738 | Chain trueJumps; |
duke@1 | 739 | |
duke@1 | 740 | /** A chain encomassing all jumps that can be taken |
duke@1 | 741 | * if the condition evaluates to false. |
duke@1 | 742 | */ |
duke@1 | 743 | Chain falseJumps; |
duke@1 | 744 | |
duke@1 | 745 | /** The jump's opcode. |
duke@1 | 746 | */ |
duke@1 | 747 | int opcode; |
duke@1 | 748 | |
duke@1 | 749 | /* |
duke@1 | 750 | * An abstract syntax tree of this item. It is needed |
duke@1 | 751 | * for branch entries in 'CharacterRangeTable' attribute. |
duke@1 | 752 | */ |
duke@1 | 753 | JCTree tree; |
duke@1 | 754 | |
duke@1 | 755 | CondItem(int opcode, Chain truejumps, Chain falsejumps) { |
duke@1 | 756 | super(BYTEcode); |
duke@1 | 757 | this.opcode = opcode; |
duke@1 | 758 | this.trueJumps = truejumps; |
duke@1 | 759 | this.falseJumps = falsejumps; |
duke@1 | 760 | } |
duke@1 | 761 | |
duke@1 | 762 | Item load() { |
duke@1 | 763 | Chain trueChain = null; |
duke@1 | 764 | Chain falseChain = jumpFalse(); |
duke@1 | 765 | if (!isFalse()) { |
duke@1 | 766 | code.resolve(trueJumps); |
duke@1 | 767 | code.emitop0(iconst_1); |
duke@1 | 768 | trueChain = code.branch(goto_); |
duke@1 | 769 | } |
duke@1 | 770 | if (falseChain != null) { |
duke@1 | 771 | code.resolve(falseChain); |
duke@1 | 772 | code.emitop0(iconst_0); |
duke@1 | 773 | } |
duke@1 | 774 | code.resolve(trueChain); |
duke@1 | 775 | return stackItem[typecode]; |
duke@1 | 776 | } |
duke@1 | 777 | |
duke@1 | 778 | void duplicate() { |
duke@1 | 779 | load().duplicate(); |
duke@1 | 780 | } |
duke@1 | 781 | |
duke@1 | 782 | void drop() { |
duke@1 | 783 | load().drop(); |
duke@1 | 784 | } |
duke@1 | 785 | |
duke@1 | 786 | void stash(int toscode) { |
duke@1 | 787 | assert false; |
duke@1 | 788 | } |
duke@1 | 789 | |
duke@1 | 790 | CondItem mkCond() { |
duke@1 | 791 | return this; |
duke@1 | 792 | } |
duke@1 | 793 | |
duke@1 | 794 | Chain jumpTrue() { |
jjg@507 | 795 | if (tree == null) return Code.mergeChains(trueJumps, code.branch(opcode)); |
duke@1 | 796 | // we should proceed further in -Xjcov mode only |
duke@1 | 797 | int startpc = code.curPc(); |
jjg@507 | 798 | Chain c = Code.mergeChains(trueJumps, code.branch(opcode)); |
duke@1 | 799 | code.crt.put(tree, CRTable.CRT_BRANCH_TRUE, startpc, code.curPc()); |
duke@1 | 800 | return c; |
duke@1 | 801 | } |
duke@1 | 802 | |
duke@1 | 803 | Chain jumpFalse() { |
jjg@507 | 804 | if (tree == null) return Code.mergeChains(falseJumps, code.branch(Code.negate(opcode))); |
duke@1 | 805 | // we should proceed further in -Xjcov mode only |
duke@1 | 806 | int startpc = code.curPc(); |
jjg@507 | 807 | Chain c = Code.mergeChains(falseJumps, code.branch(Code.negate(opcode))); |
duke@1 | 808 | code.crt.put(tree, CRTable.CRT_BRANCH_FALSE, startpc, code.curPc()); |
duke@1 | 809 | return c; |
duke@1 | 810 | } |
duke@1 | 811 | |
duke@1 | 812 | CondItem negate() { |
jjg@507 | 813 | CondItem c = new CondItem(Code.negate(opcode), falseJumps, trueJumps); |
duke@1 | 814 | c.tree = tree; |
duke@1 | 815 | return c; |
duke@1 | 816 | } |
duke@1 | 817 | |
duke@1 | 818 | int width() { |
duke@1 | 819 | // a CondItem doesn't have a size on the stack per se. |
duke@1 | 820 | throw new AssertionError(); |
duke@1 | 821 | } |
duke@1 | 822 | |
duke@1 | 823 | boolean isTrue() { |
duke@1 | 824 | return falseJumps == null && opcode == goto_; |
duke@1 | 825 | } |
duke@1 | 826 | |
duke@1 | 827 | boolean isFalse() { |
duke@1 | 828 | return trueJumps == null && opcode == dontgoto; |
duke@1 | 829 | } |
duke@1 | 830 | |
duke@1 | 831 | public String toString() { |
duke@1 | 832 | return "cond(" + Code.mnem(opcode) + ")"; |
duke@1 | 833 | } |
duke@1 | 834 | } |
duke@1 | 835 | } |