1 /* 2 * Copyright (c) 2011, 2016, 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 java.lang.invoke; 27 28 import jdk.internal.perf.PerfCounter; 29 import jdk.internal.vm.annotation.DontInline; 30 import jdk.internal.vm.annotation.Stable; 31 import sun.invoke.util.Wrapper; 32 33 import java.lang.annotation.ElementType; 34 import java.lang.annotation.Retention; 35 import java.lang.annotation.RetentionPolicy; 36 import java.lang.annotation.Target; 37 import java.lang.reflect.Method; 38 import java.util.Arrays; 39 import java.util.HashMap; 40 41 import static java.lang.invoke.LambdaForm.BasicType.*; 42 import static java.lang.invoke.MethodHandleNatives.Constants.REF_invokeStatic; 43 import static java.lang.invoke.MethodHandleStatics.*; 44 import java.util.Objects; 45 46 /** 47 * The symbolic, non-executable form of a method handle's invocation semantics. 48 * It consists of a series of names. 49 * The first N (N=arity) names are parameters, 50 * while any remaining names are temporary values. 51 * Each temporary specifies the application of a function to some arguments. 52 * The functions are method handles, while the arguments are mixes of 53 * constant values and local names. 54 * The result of the lambda is defined as one of the names, often the last one. 55 * <p> 56 * Here is an approximate grammar: 57 * <blockquote><pre>{@code 58 * LambdaForm = "(" ArgName* ")=>{" TempName* Result "}" 59 * ArgName = "a" N ":" T 60 * TempName = "t" N ":" T "=" Function "(" Argument* ");" 61 * Function = ConstantValue 62 * Argument = NameRef | ConstantValue 63 * Result = NameRef | "void" 64 * NameRef = "a" N | "t" N 65 * N = (any whole number) 66 * T = "L" | "I" | "J" | "F" | "D" | "V" 67 * }</pre></blockquote> 68 * Names are numbered consecutively from left to right starting at zero. 69 * (The letters are merely a taste of syntax sugar.) 70 * Thus, the first temporary (if any) is always numbered N (where N=arity). 71 * Every occurrence of a name reference in an argument list must refer to 72 * a name previously defined within the same lambda. 73 * A lambda has a void result if and only if its result index is -1. 74 * If a temporary has the type "V", it cannot be the subject of a NameRef, 75 * even though possesses a number. 76 * Note that all reference types are erased to "L", which stands for {@code Object}. 77 * All subword types (boolean, byte, short, char) are erased to "I" which is {@code int}. 78 * The other types stand for the usual primitive types. 79 * <p> 80 * Function invocation closely follows the static rules of the Java verifier. 81 * Arguments and return values must exactly match when their "Name" types are 82 * considered. 83 * Conversions are allowed only if they do not change the erased type. 84 * <ul> 85 * <li>L = Object: casts are used freely to convert into and out of reference types 86 * <li>I = int: subword types are forcibly narrowed when passed as arguments (see {@code explicitCastArguments}) 87 * <li>J = long: no implicit conversions 88 * <li>F = float: no implicit conversions 89 * <li>D = double: no implicit conversions 90 * <li>V = void: a function result may be void if and only if its Name is of type "V" 91 * </ul> 92 * Although implicit conversions are not allowed, explicit ones can easily be 93 * encoded by using temporary expressions which call type-transformed identity functions. 94 * <p> 95 * Examples: 96 * <blockquote><pre>{@code 97 * (a0:J)=>{ a0 } 98 * == identity(long) 99 * (a0:I)=>{ t1:V = System.out#println(a0); void } 100 * == System.out#println(int) 101 * (a0:L)=>{ t1:V = System.out#println(a0); a0 } 102 * == identity, with printing side-effect 103 * (a0:L, a1:L)=>{ t2:L = BoundMethodHandle#argument(a0); 104 * t3:L = BoundMethodHandle#target(a0); 105 * t4:L = MethodHandle#invoke(t3, t2, a1); t4 } 106 * == general invoker for unary insertArgument combination 107 * (a0:L, a1:L)=>{ t2:L = FilterMethodHandle#filter(a0); 108 * t3:L = MethodHandle#invoke(t2, a1); 109 * t4:L = FilterMethodHandle#target(a0); 110 * t5:L = MethodHandle#invoke(t4, t3); t5 } 111 * == general invoker for unary filterArgument combination 112 * (a0:L, a1:L)=>{ ...(same as previous example)... 113 * t5:L = MethodHandle#invoke(t4, t3, a1); t5 } 114 * == general invoker for unary/unary foldArgument combination 115 * (a0:L, a1:I)=>{ t2:I = identity(long).asType((int)->long)(a1); t2 } 116 * == invoker for identity method handle which performs i2l 117 * (a0:L, a1:L)=>{ t2:L = BoundMethodHandle#argument(a0); 118 * t3:L = Class#cast(t2,a1); t3 } 119 * == invoker for identity method handle which performs cast 120 * }</pre></blockquote> 121 * <p> 122 * @author John Rose, JSR 292 EG 123 */ 124 class LambdaForm { 125 final int arity; 126 final int result; 127 final boolean forceInline; 128 final MethodHandle customized; 129 @Stable final Name[] names; 130 final String debugName; 131 final Kind kind; 132 MemberName vmentry; // low-level behavior, or null if not yet prepared 133 private boolean isCompiled; 134 135 // Either a LambdaForm cache (managed by LambdaFormEditor) or a link to uncustomized version (for customized LF) 136 volatile Object transformCache; 137 138 public static final int VOID_RESULT = -1, LAST_RESULT = -2; 139 140 enum BasicType { 141 L_TYPE('L', Object.class, Wrapper.OBJECT), // all reference types 142 I_TYPE('I', int.class, Wrapper.INT), 143 J_TYPE('J', long.class, Wrapper.LONG), 144 F_TYPE('F', float.class, Wrapper.FLOAT), 145 D_TYPE('D', double.class, Wrapper.DOUBLE), // all primitive types 146 V_TYPE('V', void.class, Wrapper.VOID); // not valid in all contexts 147 148 static final BasicType[] ALL_TYPES = BasicType.values(); 149 static final BasicType[] ARG_TYPES = Arrays.copyOf(ALL_TYPES, ALL_TYPES.length-1); 150 151 static final int ARG_TYPE_LIMIT = ARG_TYPES.length; 152 static final int TYPE_LIMIT = ALL_TYPES.length; 153 154 final char btChar; 155 final Class<?> btClass; 156 final Wrapper btWrapper; 157 158 private BasicType(char btChar, Class<?> btClass, Wrapper wrapper) { 159 this.btChar = btChar; 160 this.btClass = btClass; 161 this.btWrapper = wrapper; 162 } 163 164 char basicTypeChar() { 165 return btChar; 166 } 167 Class<?> basicTypeClass() { 168 return btClass; 169 } 170 Wrapper basicTypeWrapper() { 171 return btWrapper; 172 } 173 int basicTypeSlots() { 174 return btWrapper.stackSlots(); 175 } 176 177 static BasicType basicType(byte type) { 178 return ALL_TYPES[type]; 179 } 180 static BasicType basicType(char type) { 181 switch (type) { 182 case 'L': return L_TYPE; 183 case 'I': return I_TYPE; 184 case 'J': return J_TYPE; 185 case 'F': return F_TYPE; 186 case 'D': return D_TYPE; 187 case 'V': return V_TYPE; 188 // all subword types are represented as ints 189 case 'Z': 190 case 'B': 191 case 'S': 192 case 'C': 193 return I_TYPE; 194 default: 195 throw newInternalError("Unknown type char: '"+type+"'"); 196 } 197 } 198 static BasicType basicType(Wrapper type) { 199 char c = type.basicTypeChar(); 200 return basicType(c); 201 } 202 static BasicType basicType(Class<?> type) { 203 if (!type.isPrimitive()) return L_TYPE; 204 return basicType(Wrapper.forPrimitiveType(type)); 205 } 206 static BasicType[] basicTypes(String types) { 207 BasicType[] btypes = new BasicType[types.length()]; 208 for (int i = 0; i < btypes.length; i++) { 209 btypes[i] = basicType(types.charAt(i)); 210 } 211 return btypes; 212 } 213 static String basicTypeDesc(BasicType[] types) { 214 if (types == null) { 215 return null; 216 } 217 if (types.length == 0) { 218 return ""; 219 } 220 StringBuilder sb = new StringBuilder(); 221 for (BasicType bt : types) { 222 sb.append(bt.basicTypeChar()); 223 } 224 return sb.toString(); 225 } 226 static int[] basicTypeOrds(BasicType[] types) { 227 if (types == null) { 228 return null; 229 } 230 int[] a = new int[types.length]; 231 for(int i = 0; i < types.length; ++i) { 232 a[i] = types[i].ordinal(); 233 } 234 return a; 235 } 236 237 static char basicTypeChar(Class<?> type) { 238 return basicType(type).btChar; 239 } 240 241 static byte[] basicTypesOrd(Class<?>[] types) { 242 byte[] ords = new byte[types.length]; 243 for (int i = 0; i < ords.length; i++) { 244 ords[i] = (byte)basicType(types[i]).ordinal(); 245 } 246 return ords; 247 } 248 249 static boolean isBasicTypeChar(char c) { 250 return "LIJFDV".indexOf(c) >= 0; 251 } 252 static boolean isArgBasicTypeChar(char c) { 253 return "LIJFD".indexOf(c) >= 0; 254 } 255 256 static { assert(checkBasicType()); } 257 private static boolean checkBasicType() { 258 for (int i = 0; i < ARG_TYPE_LIMIT; i++) { 259 assert ARG_TYPES[i].ordinal() == i; 260 assert ARG_TYPES[i] == ALL_TYPES[i]; 261 } 262 for (int i = 0; i < TYPE_LIMIT; i++) { 263 assert ALL_TYPES[i].ordinal() == i; 264 } 265 assert ALL_TYPES[TYPE_LIMIT - 1] == V_TYPE; 266 assert !Arrays.asList(ARG_TYPES).contains(V_TYPE); 267 return true; 268 } 269 } 270 271 enum Kind { 272 GENERIC(""), 273 BOUND_REINVOKER("BMH.reinvoke"), 274 REINVOKER("MH.reinvoke"), 275 DELEGATE("MH.delegate"), 276 DIRECT_INVOKE_VIRTUAL("DMH.invokeVirtual"), 277 DIRECT_INVOKE_SPECIAL("DMH.invokeSpecial"), 278 DIRECT_INVOKE_STATIC("DMH.invokeStatic"), 279 DIRECT_NEW_INVOKE_SPECIAL("DMH.newInvokeSpecial"), 280 DIRECT_INVOKE_INTERFACE("DMH.invokeInterface"), 281 DIRECT_INVOKE_STATIC_INIT("DMH.invokeStaticInit"); 282 283 final String defaultLambdaName; 284 final String methodName; 285 286 private Kind(String defaultLambdaName) { 287 this.defaultLambdaName = defaultLambdaName; 288 int p = defaultLambdaName.indexOf('.'); 289 if (p > -1) { 290 this.methodName = defaultLambdaName.substring(p + 1); 291 } else { 292 this.methodName = defaultLambdaName; 293 } 294 } 295 } 296 297 LambdaForm(String debugName, 298 int arity, Name[] names, int result) { 299 this(debugName, arity, names, result, /*forceInline=*/true, /*customized=*/null, Kind.GENERIC); 300 } 301 LambdaForm(String debugName, 302 int arity, Name[] names, int result, Kind kind) { 303 this(debugName, arity, names, result, /*forceInline=*/true, /*customized=*/null, kind); 304 } 305 LambdaForm(String debugName, 306 int arity, Name[] names, int result, boolean forceInline, MethodHandle customized) { 307 this(debugName, arity, names, result, forceInline, customized, Kind.GENERIC); 308 } 309 LambdaForm(String debugName, 310 int arity, Name[] names, int result, boolean forceInline, MethodHandle customized, Kind kind) { 311 assert(namesOK(arity, names)); 312 this.arity = arity; 313 this.result = fixResult(result, names); 314 this.names = names.clone(); 315 this.debugName = fixDebugName(debugName); 316 this.forceInline = forceInline; 317 this.customized = customized; 318 this.kind = kind; 319 int maxOutArity = normalize(); 320 if (maxOutArity > MethodType.MAX_MH_INVOKER_ARITY) { 321 // Cannot use LF interpreter on very high arity expressions. 322 assert(maxOutArity <= MethodType.MAX_JVM_ARITY); 323 compileToBytecode(); 324 } 325 } 326 LambdaForm(String debugName, 327 int arity, Name[] names) { 328 this(debugName, arity, names, LAST_RESULT, /*forceInline=*/true, /*customized=*/null, Kind.GENERIC); 329 } 330 LambdaForm(String debugName, 331 int arity, Name[] names, boolean forceInline) { 332 this(debugName, arity, names, LAST_RESULT, forceInline, /*customized=*/null, Kind.GENERIC); 333 } 334 LambdaForm(String debugName, 335 int arity, Name[] names, boolean forceInline, Kind kind) { 336 this(debugName, arity, names, LAST_RESULT, forceInline, /*customized=*/null, kind); 337 } 338 LambdaForm(String debugName, 339 Name[] formals, Name[] temps, Name result) { 340 this(debugName, 341 formals.length, buildNames(formals, temps, result), LAST_RESULT, /*forceInline=*/true, /*customized=*/null); 342 } 343 LambdaForm(String debugName, 344 Name[] formals, Name[] temps, Name result, boolean forceInline) { 345 this(debugName, 346 formals.length, buildNames(formals, temps, result), LAST_RESULT, forceInline, /*customized=*/null); 347 } 348 349 private static Name[] buildNames(Name[] formals, Name[] temps, Name result) { 350 int arity = formals.length; 351 int length = arity + temps.length + (result == null ? 0 : 1); 352 Name[] names = Arrays.copyOf(formals, length); 353 System.arraycopy(temps, 0, names, arity, temps.length); 354 if (result != null) 355 names[length - 1] = result; 356 return names; 357 } 358 359 private LambdaForm(MethodType mt) { 360 // Make a blank lambda form, which returns a constant zero or null. 361 // It is used as a template for managing the invocation of similar forms that are non-empty. 362 // Called only from getPreparedForm. 363 this.arity = mt.parameterCount(); 364 this.result = (mt.returnType() == void.class || mt.returnType() == Void.class) ? -1 : arity; 365 this.names = buildEmptyNames(arity, mt, result == -1); 366 this.debugName = "LF.zero"; 367 this.forceInline = true; 368 this.customized = null; 369 this.kind = Kind.GENERIC; 370 assert(nameRefsAreLegal()); 371 assert(isEmpty()); 372 String sig = null; 373 assert(isValidSignature(sig = basicTypeSignature())); 374 assert(sig.equals(basicTypeSignature())) : sig + " != " + basicTypeSignature(); 375 } 376 377 private static Name[] buildEmptyNames(int arity, MethodType mt, boolean isVoid) { 378 Name[] names = arguments(isVoid ? 0 : 1, mt); 379 if (!isVoid) { 380 Name zero = new Name(constantZero(basicType(mt.returnType()))); 381 names[arity] = zero.newIndex(arity); 382 } 383 return names; 384 } 385 386 private static int fixResult(int result, Name[] names) { 387 if (result == LAST_RESULT) 388 result = names.length - 1; // might still be void 389 if (result >= 0 && names[result].type == V_TYPE) 390 result = VOID_RESULT; 391 return result; 392 } 393 394 private static String fixDebugName(String debugName) { 395 if (DEBUG_NAME_COUNTERS != null) { 396 int under = debugName.indexOf('_'); 397 int length = debugName.length(); 398 if (under < 0) under = length; 399 String debugNameStem = debugName.substring(0, under); 400 Integer ctr; 401 synchronized (DEBUG_NAME_COUNTERS) { 402 ctr = DEBUG_NAME_COUNTERS.get(debugNameStem); 403 if (ctr == null) ctr = 0; 404 DEBUG_NAME_COUNTERS.put(debugNameStem, ctr+1); 405 } 406 StringBuilder buf = new StringBuilder(debugNameStem); 407 buf.append('_'); 408 int leadingZero = buf.length(); 409 buf.append((int) ctr); 410 for (int i = buf.length() - leadingZero; i < 3; i++) 411 buf.insert(leadingZero, '0'); 412 if (under < length) { 413 ++under; // skip "_" 414 while (under < length && Character.isDigit(debugName.charAt(under))) { 415 ++under; 416 } 417 if (under < length && debugName.charAt(under) == '_') ++under; 418 if (under < length) 419 buf.append('_').append(debugName, under, length); 420 } 421 return buf.toString(); 422 } 423 return debugName; 424 } 425 426 private static boolean namesOK(int arity, Name[] names) { 427 for (int i = 0; i < names.length; i++) { 428 Name n = names[i]; 429 assert(n != null) : "n is null"; 430 if (i < arity) 431 assert( n.isParam()) : n + " is not param at " + i; 432 else 433 assert(!n.isParam()) : n + " is param at " + i; 434 } 435 return true; 436 } 437 438 /** Customize LambdaForm for a particular MethodHandle */ 439 LambdaForm customize(MethodHandle mh) { 440 LambdaForm customForm = new LambdaForm(debugName, arity, names, result, forceInline, mh, kind); 441 if (COMPILE_THRESHOLD >= 0 && isCompiled) { 442 // If shared LambdaForm has been compiled, compile customized version as well. 443 customForm.compileToBytecode(); 444 } 445 customForm.transformCache = this; // LambdaFormEditor should always use uncustomized form. 446 return customForm; 447 } 448 449 /** Get uncustomized flavor of the LambdaForm */ 450 LambdaForm uncustomize() { 451 if (customized == null) { 452 return this; 453 } 454 assert(transformCache != null); // Customized LambdaForm should always has a link to uncustomized version. 455 LambdaForm uncustomizedForm = (LambdaForm)transformCache; 456 if (COMPILE_THRESHOLD >= 0 && isCompiled) { 457 // If customized LambdaForm has been compiled, compile uncustomized version as well. 458 uncustomizedForm.compileToBytecode(); 459 } 460 return uncustomizedForm; 461 } 462 463 /** Renumber and/or replace params so that they are interned and canonically numbered. 464 * @return maximum argument list length among the names (since we have to pass over them anyway) 465 */ 466 private int normalize() { 467 Name[] oldNames = null; 468 int maxOutArity = 0; 469 int changesStart = 0; 470 for (int i = 0; i < names.length; i++) { 471 Name n = names[i]; 472 if (!n.initIndex(i)) { 473 if (oldNames == null) { 474 oldNames = names.clone(); 475 changesStart = i; 476 } 477 names[i] = n.cloneWithIndex(i); 478 } 479 if (n.arguments != null && maxOutArity < n.arguments.length) 480 maxOutArity = n.arguments.length; 481 } 482 if (oldNames != null) { 483 int startFixing = arity; 484 if (startFixing <= changesStart) 485 startFixing = changesStart+1; 486 for (int i = startFixing; i < names.length; i++) { 487 Name fixed = names[i].replaceNames(oldNames, names, changesStart, i); 488 names[i] = fixed.newIndex(i); 489 } 490 } 491 assert(nameRefsAreLegal()); 492 int maxInterned = Math.min(arity, INTERNED_ARGUMENT_LIMIT); 493 boolean needIntern = false; 494 for (int i = 0; i < maxInterned; i++) { 495 Name n = names[i], n2 = internArgument(n); 496 if (n != n2) { 497 names[i] = n2; 498 needIntern = true; 499 } 500 } 501 if (needIntern) { 502 for (int i = arity; i < names.length; i++) { 503 names[i].internArguments(); 504 } 505 } 506 assert(nameRefsAreLegal()); 507 return maxOutArity; 508 } 509 510 /** 511 * Check that all embedded Name references are localizable to this lambda, 512 * and are properly ordered after their corresponding definitions. 513 * <p> 514 * Note that a Name can be local to multiple lambdas, as long as 515 * it possesses the same index in each use site. 516 * This allows Name references to be freely reused to construct 517 * fresh lambdas, without confusion. 518 */ 519 boolean nameRefsAreLegal() { 520 assert(arity >= 0 && arity <= names.length); 521 assert(result >= -1 && result < names.length); 522 // Do all names possess an index consistent with their local definition order? 523 for (int i = 0; i < arity; i++) { 524 Name n = names[i]; 525 assert(n.index() == i) : Arrays.asList(n.index(), i); 526 assert(n.isParam()); 527 } 528 // Also, do all local name references 529 for (int i = arity; i < names.length; i++) { 530 Name n = names[i]; 531 assert(n.index() == i); 532 for (Object arg : n.arguments) { 533 if (arg instanceof Name) { 534 Name n2 = (Name) arg; 535 int i2 = n2.index; 536 assert(0 <= i2 && i2 < names.length) : n.debugString() + ": 0 <= i2 && i2 < names.length: 0 <= " + i2 + " < " + names.length; 537 assert(names[i2] == n2) : Arrays.asList("-1-", i, "-2-", n.debugString(), "-3-", i2, "-4-", n2.debugString(), "-5-", names[i2].debugString(), "-6-", this); 538 assert(i2 < i); // ref must come after def! 539 } 540 } 541 } 542 return true; 543 } 544 545 /** Invoke this form on the given arguments. */ 546 // final Object invoke(Object... args) throws Throwable { 547 // // NYI: fit this into the fast path? 548 // return interpretWithArguments(args); 549 // } 550 551 /** Report the return type. */ 552 BasicType returnType() { 553 if (result < 0) return V_TYPE; 554 Name n = names[result]; 555 return n.type; 556 } 557 558 /** Report the N-th argument type. */ 559 BasicType parameterType(int n) { 560 return parameter(n).type; 561 } 562 563 /** Report the N-th argument name. */ 564 Name parameter(int n) { 565 assert(n < arity); 566 Name param = names[n]; 567 assert(param.isParam()); 568 return param; 569 } 570 571 /** Report the N-th argument type constraint. */ 572 Object parameterConstraint(int n) { 573 return parameter(n).constraint; 574 } 575 576 /** Report the arity. */ 577 int arity() { 578 return arity; 579 } 580 581 /** Report the number of expressions (non-parameter names). */ 582 int expressionCount() { 583 return names.length - arity; 584 } 585 586 /** Return the method type corresponding to my basic type signature. */ 587 MethodType methodType() { 588 Class<?>[] ptypes = new Class<?>[arity]; 589 for (int i = 0; i < arity; ++i) { 590 ptypes[i] = parameterType(i).btClass; 591 } 592 return MethodType.methodType(returnType().btClass, ptypes); 593 } 594 595 /** Return ABC_Z, where the ABC are parameter type characters, and Z is the return type character. */ 596 final String basicTypeSignature() { 597 StringBuilder buf = new StringBuilder(arity() + 3); 598 for (int i = 0, a = arity(); i < a; i++) 599 buf.append(parameterType(i).basicTypeChar()); 600 return buf.append('_').append(returnType().basicTypeChar()).toString(); 601 } 602 static int signatureArity(String sig) { 603 assert(isValidSignature(sig)); 604 return sig.indexOf('_'); 605 } 606 static BasicType signatureReturn(String sig) { 607 return basicType(sig.charAt(signatureArity(sig) + 1)); 608 } 609 static boolean isValidSignature(String sig) { 610 int arity = sig.indexOf('_'); 611 if (arity < 0) return false; // must be of the form *_* 612 int siglen = sig.length(); 613 if (siglen != arity + 2) return false; // *_X 614 for (int i = 0; i < siglen; i++) { 615 if (i == arity) continue; // skip '_' 616 char c = sig.charAt(i); 617 if (c == 'V') 618 return (i == siglen - 1 && arity == siglen - 2); 619 if (!isArgBasicTypeChar(c)) return false; // must be [LIJFD] 620 } 621 return true; // [LIJFD]*_[LIJFDV] 622 } 623 static MethodType signatureType(String sig) { 624 Class<?>[] ptypes = new Class<?>[signatureArity(sig)]; 625 for (int i = 0; i < ptypes.length; i++) 626 ptypes[i] = basicType(sig.charAt(i)).btClass; 627 Class<?> rtype = signatureReturn(sig).btClass; 628 return MethodType.methodType(rtype, ptypes); 629 } 630 631 /** 632 * Check if i-th name is a call to MethodHandleImpl.selectAlternative. 633 */ 634 boolean isSelectAlternative(int pos) { 635 // selectAlternative idiom: 636 // t_{n}:L=MethodHandleImpl.selectAlternative(...) 637 // t_{n+1}:?=MethodHandle.invokeBasic(t_{n}, ...) 638 if (pos+1 >= names.length) return false; 639 Name name0 = names[pos]; 640 Name name1 = names[pos+1]; 641 return name0.refersTo(MethodHandleImpl.class, "selectAlternative") && 642 name1.isInvokeBasic() && 643 name1.lastUseIndex(name0) == 0 && // t_{n+1}:?=MethodHandle.invokeBasic(t_{n}, ...) 644 lastUseIndex(name0) == pos+1; // t_{n} is local: used only in t_{n+1} 645 } 646 647 private boolean isMatchingIdiom(int pos, String idiomName, int nArgs) { 648 if (pos+2 >= names.length) return false; 649 Name name0 = names[pos]; 650 Name name1 = names[pos+1]; 651 Name name2 = names[pos+2]; 652 return name1.refersTo(MethodHandleImpl.class, idiomName) && 653 name0.isInvokeBasic() && 654 name2.isInvokeBasic() && 655 name1.lastUseIndex(name0) == nArgs && // t_{n+1}:L=MethodHandleImpl.<invoker>(<args>, t_{n}); 656 lastUseIndex(name0) == pos+1 && // t_{n} is local: used only in t_{n+1} 657 name2.lastUseIndex(name1) == 1 && // t_{n+2}:?=MethodHandle.invokeBasic(*, t_{n+1}) 658 lastUseIndex(name1) == pos+2; // t_{n+1} is local: used only in t_{n+2} 659 } 660 661 /** 662 * Check if i-th name is a start of GuardWithCatch idiom. 663 */ 664 boolean isGuardWithCatch(int pos) { 665 // GuardWithCatch idiom: 666 // t_{n}:L=MethodHandle.invokeBasic(...) 667 // t_{n+1}:L=MethodHandleImpl.guardWithCatch(*, *, *, t_{n}); 668 // t_{n+2}:?=MethodHandle.invokeBasic(*, t_{n+1}) 669 return isMatchingIdiom(pos, "guardWithCatch", 3); 670 } 671 672 /** 673 * Check if i-th name is a start of the tryFinally idiom. 674 */ 675 boolean isTryFinally(int pos) { 676 // tryFinally idiom: 677 // t_{n}:L=MethodHandle.invokeBasic(...) 678 // t_{n+1}:L=MethodHandleImpl.tryFinally(*, *, t_{n}) 679 // t_{n+2}:?=MethodHandle.invokeBasic(*, t_{n+1}) 680 return isMatchingIdiom(pos, "tryFinally", 2); 681 } 682 683 /** 684 * Check if i-th name is a start of the loop idiom. 685 */ 686 boolean isLoop(int pos) { 687 // loop idiom: 688 // t_{n}:L=MethodHandle.invokeBasic(...) 689 // t_{n+1}:L=MethodHandleImpl.loop(types, *, *, *, *, t_{n}) 690 // t_{n+2}:?=MethodHandle.invokeBasic(*, t_{n+1}) 691 return isMatchingIdiom(pos, "loop", 5); 692 } 693 694 /* 695 * Code generation issues: 696 * 697 * Compiled LFs should be reusable in general. 698 * The biggest issue is how to decide when to pull a name into 699 * the bytecode, versus loading a reified form from the MH data. 700 * 701 * For example, an asType wrapper may require execution of a cast 702 * after a call to a MH. The target type of the cast can be placed 703 * as a constant in the LF itself. This will force the cast type 704 * to be compiled into the bytecodes and native code for the MH. 705 * Or, the target type of the cast can be erased in the LF, and 706 * loaded from the MH data. (Later on, if the MH as a whole is 707 * inlined, the data will flow into the inlined instance of the LF, 708 * as a constant, and the end result will be an optimal cast.) 709 * 710 * This erasure of cast types can be done with any use of 711 * reference types. It can also be done with whole method 712 * handles. Erasing a method handle might leave behind 713 * LF code that executes correctly for any MH of a given 714 * type, and load the required MH from the enclosing MH's data. 715 * Or, the erasure might even erase the expected MT. 716 * 717 * Also, for direct MHs, the MemberName of the target 718 * could be erased, and loaded from the containing direct MH. 719 * As a simple case, a LF for all int-valued non-static 720 * field getters would perform a cast on its input argument 721 * (to non-constant base type derived from the MemberName) 722 * and load an integer value from the input object 723 * (at a non-constant offset also derived from the MemberName). 724 * Such MN-erased LFs would be inlinable back to optimized 725 * code, whenever a constant enclosing DMH is available 726 * to supply a constant MN from its data. 727 * 728 * The main problem here is to keep LFs reasonably generic, 729 * while ensuring that hot spots will inline good instances. 730 * "Reasonably generic" means that we don't end up with 731 * repeated versions of bytecode or machine code that do 732 * not differ in their optimized form. Repeated versions 733 * of machine would have the undesirable overheads of 734 * (a) redundant compilation work and (b) extra I$ pressure. 735 * To control repeated versions, we need to be ready to 736 * erase details from LFs and move them into MH data, 737 * whevener those details are not relevant to significant 738 * optimization. "Significant" means optimization of 739 * code that is actually hot. 740 * 741 * Achieving this may require dynamic splitting of MHs, by replacing 742 * a generic LF with a more specialized one, on the same MH, 743 * if (a) the MH is frequently executed and (b) the MH cannot 744 * be inlined into a containing caller, such as an invokedynamic. 745 * 746 * Compiled LFs that are no longer used should be GC-able. 747 * If they contain non-BCP references, they should be properly 748 * interlinked with the class loader(s) that their embedded types 749 * depend on. This probably means that reusable compiled LFs 750 * will be tabulated (indexed) on relevant class loaders, 751 * or else that the tables that cache them will have weak links. 752 */ 753 754 /** 755 * Make this LF directly executable, as part of a MethodHandle. 756 * Invariant: Every MH which is invoked must prepare its LF 757 * before invocation. 758 * (In principle, the JVM could do this very lazily, 759 * as a sort of pre-invocation linkage step.) 760 */ 761 public void prepare() { 762 if (COMPILE_THRESHOLD == 0 && !forceInterpretation() && !isCompiled) { 763 compileToBytecode(); 764 } 765 if (this.vmentry != null) { 766 // already prepared (e.g., a primitive DMH invoker form) 767 return; 768 } 769 MethodType mtype = methodType(); 770 LambdaForm prep = mtype.form().cachedLambdaForm(MethodTypeForm.LF_INTERPRET); 771 if (prep == null) { 772 assert (isValidSignature(basicTypeSignature())); 773 prep = new LambdaForm(mtype); 774 prep.vmentry = InvokerBytecodeGenerator.generateLambdaFormInterpreterEntryPoint(mtype); 775 prep = mtype.form().setCachedLambdaForm(MethodTypeForm.LF_INTERPRET, prep); 776 } 777 this.vmentry = prep.vmentry; 778 // TO DO: Maybe add invokeGeneric, invokeWithArguments 779 } 780 781 private static @Stable PerfCounter LF_FAILED; 782 783 private static PerfCounter failedCompilationCounter() { 784 if (LF_FAILED == null) { 785 LF_FAILED = PerfCounter.newPerfCounter("java.lang.invoke.failedLambdaFormCompilations"); 786 } 787 return LF_FAILED; 788 } 789 790 /** Generate optimizable bytecode for this form. */ 791 void compileToBytecode() { 792 if (forceInterpretation()) { 793 return; // this should not be compiled 794 } 795 if (vmentry != null && isCompiled) { 796 return; // already compiled somehow 797 } 798 MethodType invokerType = methodType(); 799 assert(vmentry == null || vmentry.getMethodType().basicType().equals(invokerType)); 800 try { 801 vmentry = InvokerBytecodeGenerator.generateCustomizedCode(this, invokerType); 802 if (TRACE_INTERPRETER) 803 traceInterpreter("compileToBytecode", this); 804 isCompiled = true; 805 } catch (InvokerBytecodeGenerator.BytecodeGenerationException bge) { 806 // bytecode generation failed - mark this LambdaForm as to be run in interpretation mode only 807 invocationCounter = -1; 808 failedCompilationCounter().increment(); 809 if (LOG_LF_COMPILATION_FAILURE) { 810 System.out.println("LambdaForm compilation failed: " + this); 811 bge.printStackTrace(System.out); 812 } 813 } catch (Error | Exception e) { 814 throw newInternalError(this.toString(), e); 815 } 816 } 817 818 private static void computeInitialPreparedForms() { 819 // Find all predefined invokers and associate them with canonical empty lambda forms. 820 for (MemberName m : MemberName.getFactory().getMethods(LambdaForm.class, false, null, null, null)) { 821 if (!m.isStatic() || !m.isPackage()) continue; 822 MethodType mt = m.getMethodType(); 823 if (mt.parameterCount() > 0 && 824 mt.parameterType(0) == MethodHandle.class && 825 m.getName().startsWith("interpret_")) { 826 String sig = null; 827 assert((sig = basicTypeSignature(mt)) != null && 828 m.getName().equals("interpret" + sig.substring(sig.indexOf('_')))); 829 LambdaForm form = new LambdaForm(mt); 830 form.vmentry = m; 831 form = mt.form().setCachedLambdaForm(MethodTypeForm.LF_INTERPRET, form); 832 } 833 } 834 } 835 836 // Set this false to disable use of the interpret_L methods defined in this file. 837 private static final boolean USE_PREDEFINED_INTERPRET_METHODS = true; 838 839 // The following are predefined exact invokers. The system must build 840 // a separate invoker for each distinct signature. 841 static Object interpret_L(MethodHandle mh) throws Throwable { 842 Object[] av = {mh}; 843 String sig = null; 844 assert(argumentTypesMatch(sig = "L_L", av)); 845 Object res = mh.form.interpretWithArguments(av); 846 assert(returnTypesMatch(sig, av, res)); 847 return res; 848 } 849 static Object interpret_L(MethodHandle mh, Object x1) throws Throwable { 850 Object[] av = {mh, x1}; 851 String sig = null; 852 assert(argumentTypesMatch(sig = "LL_L", av)); 853 Object res = mh.form.interpretWithArguments(av); 854 assert(returnTypesMatch(sig, av, res)); 855 return res; 856 } 857 static Object interpret_L(MethodHandle mh, Object x1, Object x2) throws Throwable { 858 Object[] av = {mh, x1, x2}; 859 String sig = null; 860 assert(argumentTypesMatch(sig = "LLL_L", av)); 861 Object res = mh.form.interpretWithArguments(av); 862 assert(returnTypesMatch(sig, av, res)); 863 return res; 864 } 865 866 // The next few routines are called only from assert expressions 867 // They verify that the built-in invokers process the correct raw data types. 868 private static boolean argumentTypesMatch(String sig, Object[] av) { 869 int arity = signatureArity(sig); 870 assert(av.length == arity) : "av.length == arity: av.length=" + av.length + ", arity=" + arity; 871 assert(av[0] instanceof MethodHandle) : "av[0] not instace of MethodHandle: " + av[0]; 872 MethodHandle mh = (MethodHandle) av[0]; 873 MethodType mt = mh.type(); 874 assert(mt.parameterCount() == arity-1); 875 for (int i = 0; i < av.length; i++) { 876 Class<?> pt = (i == 0 ? MethodHandle.class : mt.parameterType(i-1)); 877 assert(valueMatches(basicType(sig.charAt(i)), pt, av[i])); 878 } 879 return true; 880 } 881 private static boolean valueMatches(BasicType tc, Class<?> type, Object x) { 882 // The following line is needed because (...)void method handles can use non-void invokers 883 if (type == void.class) tc = V_TYPE; // can drop any kind of value 884 assert tc == basicType(type) : tc + " == basicType(" + type + ")=" + basicType(type); 885 switch (tc) { 886 case I_TYPE: assert checkInt(type, x) : "checkInt(" + type + "," + x +")"; break; 887 case J_TYPE: assert x instanceof Long : "instanceof Long: " + x; break; 888 case F_TYPE: assert x instanceof Float : "instanceof Float: " + x; break; 889 case D_TYPE: assert x instanceof Double : "instanceof Double: " + x; break; 890 case L_TYPE: assert checkRef(type, x) : "checkRef(" + type + "," + x + ")"; break; 891 case V_TYPE: break; // allow anything here; will be dropped 892 default: assert(false); 893 } 894 return true; 895 } 896 private static boolean returnTypesMatch(String sig, Object[] av, Object res) { 897 MethodHandle mh = (MethodHandle) av[0]; 898 return valueMatches(signatureReturn(sig), mh.type().returnType(), res); 899 } 900 private static boolean checkInt(Class<?> type, Object x) { 901 assert(x instanceof Integer); 902 if (type == int.class) return true; 903 Wrapper w = Wrapper.forBasicType(type); 904 assert(w.isSubwordOrInt()); 905 Object x1 = Wrapper.INT.wrap(w.wrap(x)); 906 return x.equals(x1); 907 } 908 private static boolean checkRef(Class<?> type, Object x) { 909 assert(!type.isPrimitive()); 910 if (x == null) return true; 911 if (type.isInterface()) return true; 912 return type.isInstance(x); 913 } 914 915 /** If the invocation count hits the threshold we spin bytecodes and call that subsequently. */ 916 private static final int COMPILE_THRESHOLD; 917 static { 918 COMPILE_THRESHOLD = Math.max(-1, MethodHandleStatics.COMPILE_THRESHOLD); 919 } 920 private int invocationCounter = 0; // a value of -1 indicates LambdaForm interpretation mode forever 921 922 private boolean forceInterpretation() { 923 return invocationCounter == -1; 924 } 925 926 @Hidden 927 @DontInline 928 /** Interpretively invoke this form on the given arguments. */ 929 Object interpretWithArguments(Object... argumentValues) throws Throwable { 930 if (TRACE_INTERPRETER) 931 return interpretWithArgumentsTracing(argumentValues); 932 checkInvocationCounter(); 933 assert(arityCheck(argumentValues)); 934 Object[] values = Arrays.copyOf(argumentValues, names.length); 935 for (int i = argumentValues.length; i < values.length; i++) { 936 values[i] = interpretName(names[i], values); 937 } 938 Object rv = (result < 0) ? null : values[result]; 939 assert(resultCheck(argumentValues, rv)); 940 return rv; 941 } 942 943 @Hidden 944 @DontInline 945 /** Evaluate a single Name within this form, applying its function to its arguments. */ 946 Object interpretName(Name name, Object[] values) throws Throwable { 947 if (TRACE_INTERPRETER) 948 traceInterpreter("| interpretName", name.debugString(), (Object[]) null); 949 Object[] arguments = Arrays.copyOf(name.arguments, name.arguments.length, Object[].class); 950 for (int i = 0; i < arguments.length; i++) { 951 Object a = arguments[i]; 952 if (a instanceof Name) { 953 int i2 = ((Name)a).index(); 954 assert(names[i2] == a); 955 a = values[i2]; 956 arguments[i] = a; 957 } 958 } 959 return name.function.invokeWithArguments(arguments); 960 } 961 962 private void checkInvocationCounter() { 963 if (COMPILE_THRESHOLD != 0 && 964 !forceInterpretation() && invocationCounter < COMPILE_THRESHOLD) { 965 invocationCounter++; // benign race 966 if (invocationCounter >= COMPILE_THRESHOLD) { 967 // Replace vmentry with a bytecode version of this LF. 968 compileToBytecode(); 969 } 970 } 971 } 972 Object interpretWithArgumentsTracing(Object... argumentValues) throws Throwable { 973 traceInterpreter("[ interpretWithArguments", this, argumentValues); 974 if (!forceInterpretation() && invocationCounter < COMPILE_THRESHOLD) { 975 int ctr = invocationCounter++; // benign race 976 traceInterpreter("| invocationCounter", ctr); 977 if (invocationCounter >= COMPILE_THRESHOLD) { 978 compileToBytecode(); 979 } 980 } 981 Object rval; 982 try { 983 assert(arityCheck(argumentValues)); 984 Object[] values = Arrays.copyOf(argumentValues, names.length); 985 for (int i = argumentValues.length; i < values.length; i++) { 986 values[i] = interpretName(names[i], values); 987 } 988 rval = (result < 0) ? null : values[result]; 989 } catch (Throwable ex) { 990 traceInterpreter("] throw =>", ex); 991 throw ex; 992 } 993 traceInterpreter("] return =>", rval); 994 return rval; 995 } 996 997 static void traceInterpreter(String event, Object obj, Object... args) { 998 if (TRACE_INTERPRETER) { 999 System.out.println("LFI: "+event+" "+(obj != null ? obj : "")+(args != null && args.length != 0 ? Arrays.asList(args) : "")); 1000 } 1001 } 1002 static void traceInterpreter(String event, Object obj) { 1003 traceInterpreter(event, obj, (Object[])null); 1004 } 1005 private boolean arityCheck(Object[] argumentValues) { 1006 assert(argumentValues.length == arity) : arity+"!="+Arrays.asList(argumentValues)+".length"; 1007 // also check that the leading (receiver) argument is somehow bound to this LF: 1008 assert(argumentValues[0] instanceof MethodHandle) : "not MH: " + argumentValues[0]; 1009 MethodHandle mh = (MethodHandle) argumentValues[0]; 1010 assert(mh.internalForm() == this); 1011 // note: argument #0 could also be an interface wrapper, in the future 1012 argumentTypesMatch(basicTypeSignature(), argumentValues); 1013 return true; 1014 } 1015 private boolean resultCheck(Object[] argumentValues, Object result) { 1016 MethodHandle mh = (MethodHandle) argumentValues[0]; 1017 MethodType mt = mh.type(); 1018 assert(valueMatches(returnType(), mt.returnType(), result)); 1019 return true; 1020 } 1021 1022 private boolean isEmpty() { 1023 if (result < 0) 1024 return (names.length == arity); 1025 else if (result == arity && names.length == arity + 1) 1026 return names[arity].isConstantZero(); 1027 else 1028 return false; 1029 } 1030 1031 public String toString() { 1032 StringBuilder buf = new StringBuilder(debugName+"=Lambda("); 1033 for (int i = 0; i < names.length; i++) { 1034 if (i == arity) buf.append(")=>{"); 1035 Name n = names[i]; 1036 if (i >= arity) buf.append("\n "); 1037 buf.append(n.paramString()); 1038 if (i < arity) { 1039 if (i+1 < arity) buf.append(","); 1040 continue; 1041 } 1042 buf.append("=").append(n.exprString()); 1043 buf.append(";"); 1044 } 1045 if (arity == names.length) buf.append(")=>{"); 1046 buf.append(result < 0 ? "void" : names[result]).append("}"); 1047 if (TRACE_INTERPRETER) { 1048 // Extra verbosity: 1049 buf.append(":").append(basicTypeSignature()); 1050 buf.append("/").append(vmentry); 1051 } 1052 return buf.toString(); 1053 } 1054 1055 @Override 1056 public boolean equals(Object obj) { 1057 return obj instanceof LambdaForm && equals((LambdaForm)obj); 1058 } 1059 public boolean equals(LambdaForm that) { 1060 if (this.result != that.result) return false; 1061 return Arrays.equals(this.names, that.names); 1062 } 1063 public int hashCode() { 1064 return result + 31 * Arrays.hashCode(names); 1065 } 1066 LambdaFormEditor editor() { 1067 return LambdaFormEditor.lambdaFormEditor(this); 1068 } 1069 1070 boolean contains(Name name) { 1071 int pos = name.index(); 1072 if (pos >= 0) { 1073 return pos < names.length && name.equals(names[pos]); 1074 } 1075 for (int i = arity; i < names.length; i++) { 1076 if (name.equals(names[i])) 1077 return true; 1078 } 1079 return false; 1080 } 1081 1082 static class NamedFunction { 1083 final MemberName member; 1084 private @Stable MethodHandle resolvedHandle; 1085 @Stable MethodHandle invoker; 1086 1087 NamedFunction(MethodHandle resolvedHandle) { 1088 this(resolvedHandle.internalMemberName(), resolvedHandle); 1089 } 1090 NamedFunction(MemberName member, MethodHandle resolvedHandle) { 1091 this.member = member; 1092 this.resolvedHandle = resolvedHandle; 1093 // The following assert is almost always correct, but will fail for corner cases, such as PrivateInvokeTest. 1094 //assert(!isInvokeBasic(member)); 1095 } 1096 NamedFunction(MethodType basicInvokerType) { 1097 assert(basicInvokerType == basicInvokerType.basicType()) : basicInvokerType; 1098 if (basicInvokerType.parameterSlotCount() < MethodType.MAX_MH_INVOKER_ARITY) { 1099 this.resolvedHandle = basicInvokerType.invokers().basicInvoker(); 1100 this.member = resolvedHandle.internalMemberName(); 1101 } else { 1102 // necessary to pass BigArityTest 1103 this.member = Invokers.invokeBasicMethod(basicInvokerType); 1104 } 1105 assert(isInvokeBasic(member)); 1106 } 1107 1108 private static boolean isInvokeBasic(MemberName member) { 1109 return member != null && 1110 member.getDeclaringClass() == MethodHandle.class && 1111 "invokeBasic".equals(member.getName()); 1112 } 1113 1114 // The next 2 constructors are used to break circular dependencies on MH.invokeStatic, etc. 1115 // Any LambdaForm containing such a member is not interpretable. 1116 // This is OK, since all such LFs are prepared with special primitive vmentry points. 1117 // And even without the resolvedHandle, the name can still be compiled and optimized. 1118 NamedFunction(Method method) { 1119 this(new MemberName(method)); 1120 } 1121 NamedFunction(MemberName member) { 1122 this(member, null); 1123 } 1124 1125 MethodHandle resolvedHandle() { 1126 if (resolvedHandle == null) resolve(); 1127 return resolvedHandle; 1128 } 1129 1130 synchronized void resolve() { 1131 if (resolvedHandle == null) { 1132 resolvedHandle = DirectMethodHandle.make(member); 1133 } 1134 } 1135 1136 @Override 1137 public boolean equals(Object other) { 1138 if (this == other) return true; 1139 if (other == null) return false; 1140 if (!(other instanceof NamedFunction)) return false; 1141 NamedFunction that = (NamedFunction) other; 1142 return this.member != null && this.member.equals(that.member); 1143 } 1144 1145 @Override 1146 public int hashCode() { 1147 if (member != null) 1148 return member.hashCode(); 1149 return super.hashCode(); 1150 } 1151 1152 // Put the predefined NamedFunction invokers into the table. 1153 static void initializeInvokers() { 1154 for (MemberName m : MemberName.getFactory().getMethods(NamedFunction.class, false, null, null, null)) { 1155 if (!m.isStatic() || !m.isPackage()) continue; 1156 MethodType type = m.getMethodType(); 1157 if (type.equals(INVOKER_METHOD_TYPE) && 1158 m.getName().startsWith("invoke_")) { 1159 String sig = m.getName().substring("invoke_".length()); 1160 int arity = LambdaForm.signatureArity(sig); 1161 MethodType srcType = MethodType.genericMethodType(arity); 1162 if (LambdaForm.signatureReturn(sig) == V_TYPE) 1163 srcType = srcType.changeReturnType(void.class); 1164 MethodTypeForm typeForm = srcType.form(); 1165 typeForm.setCachedMethodHandle(MethodTypeForm.MH_NF_INV, DirectMethodHandle.make(m)); 1166 } 1167 } 1168 } 1169 1170 // The following are predefined NamedFunction invokers. The system must build 1171 // a separate invoker for each distinct signature. 1172 /** void return type invokers. */ 1173 @Hidden 1174 static Object invoke__V(MethodHandle mh, Object[] a) throws Throwable { 1175 assert(arityCheck(0, void.class, mh, a)); 1176 mh.invokeBasic(); 1177 return null; 1178 } 1179 @Hidden 1180 static Object invoke_L_V(MethodHandle mh, Object[] a) throws Throwable { 1181 assert(arityCheck(1, void.class, mh, a)); 1182 mh.invokeBasic(a[0]); 1183 return null; 1184 } 1185 @Hidden 1186 static Object invoke_LL_V(MethodHandle mh, Object[] a) throws Throwable { 1187 assert(arityCheck(2, void.class, mh, a)); 1188 mh.invokeBasic(a[0], a[1]); 1189 return null; 1190 } 1191 @Hidden 1192 static Object invoke_LLL_V(MethodHandle mh, Object[] a) throws Throwable { 1193 assert(arityCheck(3, void.class, mh, a)); 1194 mh.invokeBasic(a[0], a[1], a[2]); 1195 return null; 1196 } 1197 @Hidden 1198 static Object invoke_LLLL_V(MethodHandle mh, Object[] a) throws Throwable { 1199 assert(arityCheck(4, void.class, mh, a)); 1200 mh.invokeBasic(a[0], a[1], a[2], a[3]); 1201 return null; 1202 } 1203 @Hidden 1204 static Object invoke_LLLLL_V(MethodHandle mh, Object[] a) throws Throwable { 1205 assert(arityCheck(5, void.class, mh, a)); 1206 mh.invokeBasic(a[0], a[1], a[2], a[3], a[4]); 1207 return null; 1208 } 1209 /** Object return type invokers. */ 1210 @Hidden 1211 static Object invoke__L(MethodHandle mh, Object[] a) throws Throwable { 1212 assert(arityCheck(0, mh, a)); 1213 return mh.invokeBasic(); 1214 } 1215 @Hidden 1216 static Object invoke_L_L(MethodHandle mh, Object[] a) throws Throwable { 1217 assert(arityCheck(1, mh, a)); 1218 return mh.invokeBasic(a[0]); 1219 } 1220 @Hidden 1221 static Object invoke_LL_L(MethodHandle mh, Object[] a) throws Throwable { 1222 assert(arityCheck(2, mh, a)); 1223 return mh.invokeBasic(a[0], a[1]); 1224 } 1225 @Hidden 1226 static Object invoke_LLL_L(MethodHandle mh, Object[] a) throws Throwable { 1227 assert(arityCheck(3, mh, a)); 1228 return mh.invokeBasic(a[0], a[1], a[2]); 1229 } 1230 @Hidden 1231 static Object invoke_LLLL_L(MethodHandle mh, Object[] a) throws Throwable { 1232 assert(arityCheck(4, mh, a)); 1233 return mh.invokeBasic(a[0], a[1], a[2], a[3]); 1234 } 1235 @Hidden 1236 static Object invoke_LLLLL_L(MethodHandle mh, Object[] a) throws Throwable { 1237 assert(arityCheck(5, mh, a)); 1238 return mh.invokeBasic(a[0], a[1], a[2], a[3], a[4]); 1239 } 1240 private static boolean arityCheck(int arity, MethodHandle mh, Object[] a) { 1241 return arityCheck(arity, Object.class, mh, a); 1242 } 1243 private static boolean arityCheck(int arity, Class<?> rtype, MethodHandle mh, Object[] a) { 1244 assert(a.length == arity) 1245 : Arrays.asList(a.length, arity); 1246 assert(mh.type().basicType() == MethodType.genericMethodType(arity).changeReturnType(rtype)) 1247 : Arrays.asList(mh, rtype, arity); 1248 MemberName member = mh.internalMemberName(); 1249 if (isInvokeBasic(member)) { 1250 assert(arity > 0); 1251 assert(a[0] instanceof MethodHandle); 1252 MethodHandle mh2 = (MethodHandle) a[0]; 1253 assert(mh2.type().basicType() == MethodType.genericMethodType(arity-1).changeReturnType(rtype)) 1254 : Arrays.asList(member, mh2, rtype, arity); 1255 } 1256 return true; 1257 } 1258 1259 static final MethodType INVOKER_METHOD_TYPE = 1260 MethodType.methodType(Object.class, MethodHandle.class, Object[].class); 1261 1262 private static MethodHandle computeInvoker(MethodTypeForm typeForm) { 1263 typeForm = typeForm.basicType().form(); // normalize to basic type 1264 MethodHandle mh = typeForm.cachedMethodHandle(MethodTypeForm.MH_NF_INV); 1265 if (mh != null) return mh; 1266 MemberName invoker = InvokerBytecodeGenerator.generateNamedFunctionInvoker(typeForm); // this could take a while 1267 mh = DirectMethodHandle.make(invoker); 1268 MethodHandle mh2 = typeForm.cachedMethodHandle(MethodTypeForm.MH_NF_INV); 1269 if (mh2 != null) return mh2; // benign race 1270 if (!mh.type().equals(INVOKER_METHOD_TYPE)) 1271 throw newInternalError(mh.debugString()); 1272 return typeForm.setCachedMethodHandle(MethodTypeForm.MH_NF_INV, mh); 1273 } 1274 1275 @Hidden 1276 Object invokeWithArguments(Object... arguments) throws Throwable { 1277 // If we have a cached invoker, call it right away. 1278 // NOTE: The invoker always returns a reference value. 1279 if (TRACE_INTERPRETER) return invokeWithArgumentsTracing(arguments); 1280 assert(checkArgumentTypes(arguments, methodType())); 1281 return invoker().invokeBasic(resolvedHandle(), arguments); 1282 } 1283 1284 @Hidden 1285 Object invokeWithArgumentsTracing(Object[] arguments) throws Throwable { 1286 Object rval; 1287 try { 1288 traceInterpreter("[ call", this, arguments); 1289 if (invoker == null) { 1290 traceInterpreter("| getInvoker", this); 1291 invoker(); 1292 } 1293 // resolvedHandle might be uninitialized, ok for tracing 1294 if (resolvedHandle == null) { 1295 traceInterpreter("| resolve", this); 1296 resolvedHandle(); 1297 } 1298 assert(checkArgumentTypes(arguments, methodType())); 1299 rval = invoker().invokeBasic(resolvedHandle(), arguments); 1300 } catch (Throwable ex) { 1301 traceInterpreter("] throw =>", ex); 1302 throw ex; 1303 } 1304 traceInterpreter("] return =>", rval); 1305 return rval; 1306 } 1307 1308 private MethodHandle invoker() { 1309 if (invoker != null) return invoker; 1310 // Get an invoker and cache it. 1311 return invoker = computeInvoker(methodType().form()); 1312 } 1313 1314 private static boolean checkArgumentTypes(Object[] arguments, MethodType methodType) { 1315 if (true) return true; // FIXME 1316 MethodType dstType = methodType.form().erasedType(); 1317 MethodType srcType = dstType.basicType().wrap(); 1318 Class<?>[] ptypes = new Class<?>[arguments.length]; 1319 for (int i = 0; i < arguments.length; i++) { 1320 Object arg = arguments[i]; 1321 Class<?> ptype = arg == null ? Object.class : arg.getClass(); 1322 // If the dest. type is a primitive we keep the 1323 // argument type. 1324 ptypes[i] = dstType.parameterType(i).isPrimitive() ? ptype : Object.class; 1325 } 1326 MethodType argType = MethodType.methodType(srcType.returnType(), ptypes).wrap(); 1327 assert(argType.isConvertibleTo(srcType)) : "wrong argument types: cannot convert " + argType + " to " + srcType; 1328 return true; 1329 } 1330 1331 MethodType methodType() { 1332 if (resolvedHandle != null) 1333 return resolvedHandle.type(); 1334 else 1335 // only for certain internal LFs during bootstrapping 1336 return member.getInvocationType(); 1337 } 1338 1339 MemberName member() { 1340 assert(assertMemberIsConsistent()); 1341 return member; 1342 } 1343 1344 // Called only from assert. 1345 private boolean assertMemberIsConsistent() { 1346 if (resolvedHandle instanceof DirectMethodHandle) { 1347 MemberName m = resolvedHandle.internalMemberName(); 1348 assert(m.equals(member)); 1349 } 1350 return true; 1351 } 1352 1353 Class<?> memberDeclaringClassOrNull() { 1354 return (member == null) ? null : member.getDeclaringClass(); 1355 } 1356 1357 BasicType returnType() { 1358 return basicType(methodType().returnType()); 1359 } 1360 1361 BasicType parameterType(int n) { 1362 return basicType(methodType().parameterType(n)); 1363 } 1364 1365 int arity() { 1366 return methodType().parameterCount(); 1367 } 1368 1369 public String toString() { 1370 if (member == null) return String.valueOf(resolvedHandle); 1371 return member.getDeclaringClass().getSimpleName()+"."+member.getName(); 1372 } 1373 1374 public boolean isIdentity() { 1375 return this.equals(identity(returnType())); 1376 } 1377 1378 public boolean isConstantZero() { 1379 return this.equals(constantZero(returnType())); 1380 } 1381 1382 public MethodHandleImpl.Intrinsic intrinsicName() { 1383 return resolvedHandle == null ? MethodHandleImpl.Intrinsic.NONE 1384 : resolvedHandle.intrinsicName(); 1385 } 1386 } 1387 1388 public static String basicTypeSignature(MethodType type) { 1389 int params = type.parameterCount(); 1390 char[] sig = new char[params + 2]; 1391 int sigp = 0; 1392 while (sigp < params) { 1393 sig[sigp] = basicTypeChar(type.parameterType(sigp++)); 1394 } 1395 sig[sigp++] = '_'; 1396 sig[sigp++] = basicTypeChar(type.returnType()); 1397 assert(sigp == sig.length); 1398 return String.valueOf(sig); 1399 } 1400 public static String shortenSignature(String signature) { 1401 // Hack to make signatures more readable when they show up in method names. 1402 final int NO_CHAR = -1, MIN_RUN = 3; 1403 int c0, c1 = NO_CHAR, c1reps = 0; 1404 StringBuilder buf = null; 1405 int len = signature.length(); 1406 if (len < MIN_RUN) return signature; 1407 for (int i = 0; i <= len; i++) { 1408 // shift in the next char: 1409 c0 = c1; c1 = (i == len ? NO_CHAR : signature.charAt(i)); 1410 if (c1 == c0) { ++c1reps; continue; } 1411 // shift in the next count: 1412 int c0reps = c1reps; c1reps = 1; 1413 // end of a character run 1414 if (c0reps < MIN_RUN) { 1415 if (buf != null) { 1416 while (--c0reps >= 0) 1417 buf.append((char)c0); 1418 } 1419 continue; 1420 } 1421 // found three or more in a row 1422 if (buf == null) 1423 buf = new StringBuilder().append(signature, 0, i - c0reps); 1424 buf.append((char)c0).append(c0reps); 1425 } 1426 return (buf == null) ? signature : buf.toString(); 1427 } 1428 1429 static final class Name { 1430 final BasicType type; 1431 @Stable short index; 1432 final NamedFunction function; 1433 final Object constraint; // additional type information, if not null 1434 @Stable final Object[] arguments; 1435 1436 private Name(int index, BasicType type, NamedFunction function, Object[] arguments) { 1437 this.index = (short)index; 1438 this.type = type; 1439 this.function = function; 1440 this.arguments = arguments; 1441 this.constraint = null; 1442 assert(this.index == index); 1443 } 1444 private Name(Name that, Object constraint) { 1445 this.index = that.index; 1446 this.type = that.type; 1447 this.function = that.function; 1448 this.arguments = that.arguments; 1449 this.constraint = constraint; 1450 assert(constraint == null || isParam()); // only params have constraints 1451 assert(constraint == null || constraint instanceof BoundMethodHandle.SpeciesData || constraint instanceof Class); 1452 } 1453 Name(MethodHandle function, Object... arguments) { 1454 this(new NamedFunction(function), arguments); 1455 } 1456 Name(MethodType functionType, Object... arguments) { 1457 this(new NamedFunction(functionType), arguments); 1458 assert(arguments[0] instanceof Name && ((Name)arguments[0]).type == L_TYPE); 1459 } 1460 Name(MemberName function, Object... arguments) { 1461 this(new NamedFunction(function), arguments); 1462 } 1463 Name(NamedFunction function, Object... arguments) { 1464 this(-1, function.returnType(), function, arguments = Arrays.copyOf(arguments, arguments.length, Object[].class)); 1465 assert(typesMatch(function, arguments)); 1466 } 1467 /** Create a raw parameter of the given type, with an expected index. */ 1468 Name(int index, BasicType type) { 1469 this(index, type, null, null); 1470 } 1471 /** Create a raw parameter of the given type. */ 1472 Name(BasicType type) { this(-1, type); } 1473 1474 BasicType type() { return type; } 1475 int index() { return index; } 1476 boolean initIndex(int i) { 1477 if (index != i) { 1478 if (index != -1) return false; 1479 index = (short)i; 1480 } 1481 return true; 1482 } 1483 char typeChar() { 1484 return type.btChar; 1485 } 1486 1487 void resolve() { 1488 if (function != null) 1489 function.resolve(); 1490 } 1491 1492 Name newIndex(int i) { 1493 if (initIndex(i)) return this; 1494 return cloneWithIndex(i); 1495 } 1496 Name cloneWithIndex(int i) { 1497 Object[] newArguments = (arguments == null) ? null : arguments.clone(); 1498 return new Name(i, type, function, newArguments).withConstraint(constraint); 1499 } 1500 Name withConstraint(Object constraint) { 1501 if (constraint == this.constraint) return this; 1502 return new Name(this, constraint); 1503 } 1504 Name replaceName(Name oldName, Name newName) { // FIXME: use replaceNames uniformly 1505 if (oldName == newName) return this; 1506 @SuppressWarnings("LocalVariableHidesMemberVariable") 1507 Object[] arguments = this.arguments; 1508 if (arguments == null) return this; 1509 boolean replaced = false; 1510 for (int j = 0; j < arguments.length; j++) { 1511 if (arguments[j] == oldName) { 1512 if (!replaced) { 1513 replaced = true; 1514 arguments = arguments.clone(); 1515 } 1516 arguments[j] = newName; 1517 } 1518 } 1519 if (!replaced) return this; 1520 return new Name(function, arguments); 1521 } 1522 /** In the arguments of this Name, replace oldNames[i] pairwise by newNames[i]. 1523 * Limit such replacements to {@code start<=i<end}. Return possibly changed self. 1524 */ 1525 Name replaceNames(Name[] oldNames, Name[] newNames, int start, int end) { 1526 if (start >= end) return this; 1527 @SuppressWarnings("LocalVariableHidesMemberVariable") 1528 Object[] arguments = this.arguments; 1529 boolean replaced = false; 1530 eachArg: 1531 for (int j = 0; j < arguments.length; j++) { 1532 if (arguments[j] instanceof Name) { 1533 Name n = (Name) arguments[j]; 1534 int check = n.index; 1535 // harmless check to see if the thing is already in newNames: 1536 if (check >= 0 && check < newNames.length && n == newNames[check]) 1537 continue eachArg; 1538 // n might not have the correct index: n != oldNames[n.index]. 1539 for (int i = start; i < end; i++) { 1540 if (n == oldNames[i]) { 1541 if (n == newNames[i]) 1542 continue eachArg; 1543 if (!replaced) { 1544 replaced = true; 1545 arguments = arguments.clone(); 1546 } 1547 arguments[j] = newNames[i]; 1548 continue eachArg; 1549 } 1550 } 1551 } 1552 } 1553 if (!replaced) return this; 1554 return new Name(function, arguments); 1555 } 1556 void internArguments() { 1557 @SuppressWarnings("LocalVariableHidesMemberVariable") 1558 Object[] arguments = this.arguments; 1559 for (int j = 0; j < arguments.length; j++) { 1560 if (arguments[j] instanceof Name) { 1561 Name n = (Name) arguments[j]; 1562 if (n.isParam() && n.index < INTERNED_ARGUMENT_LIMIT) 1563 arguments[j] = internArgument(n); 1564 } 1565 } 1566 } 1567 boolean isParam() { 1568 return function == null; 1569 } 1570 boolean isConstantZero() { 1571 return !isParam() && arguments.length == 0 && function.isConstantZero(); 1572 } 1573 1574 boolean refersTo(Class<?> declaringClass, String methodName) { 1575 return function != null && 1576 function.member() != null && function.member().refersTo(declaringClass, methodName); 1577 } 1578 1579 /** 1580 * Check if MemberName is a call to MethodHandle.invokeBasic. 1581 */ 1582 boolean isInvokeBasic() { 1583 if (function == null) 1584 return false; 1585 if (arguments.length < 1) 1586 return false; // must have MH argument 1587 MemberName member = function.member(); 1588 return member != null && member.refersTo(MethodHandle.class, "invokeBasic") && 1589 !member.isPublic() && !member.isStatic(); 1590 } 1591 1592 /** 1593 * Check if MemberName is a call to MethodHandle.linkToStatic, etc. 1594 */ 1595 boolean isLinkerMethodInvoke() { 1596 if (function == null) 1597 return false; 1598 if (arguments.length < 1) 1599 return false; // must have MH argument 1600 MemberName member = function.member(); 1601 return member != null && 1602 member.getDeclaringClass() == MethodHandle.class && 1603 !member.isPublic() && member.isStatic() && 1604 member.getName().startsWith("linkTo"); 1605 } 1606 1607 public String toString() { 1608 return (isParam()?"a":"t")+(index >= 0 ? index : System.identityHashCode(this))+":"+typeChar(); 1609 } 1610 public String debugString() { 1611 String s = paramString(); 1612 return (function == null) ? s : s + "=" + exprString(); 1613 } 1614 public String paramString() { 1615 String s = toString(); 1616 Object c = constraint; 1617 if (c == null) 1618 return s; 1619 if (c instanceof Class) c = ((Class<?>)c).getSimpleName(); 1620 return s + "/" + c; 1621 } 1622 public String exprString() { 1623 if (function == null) return toString(); 1624 StringBuilder buf = new StringBuilder(function.toString()); 1625 buf.append("("); 1626 String cma = ""; 1627 for (Object a : arguments) { 1628 buf.append(cma); cma = ","; 1629 if (a instanceof Name || a instanceof Integer) 1630 buf.append(a); 1631 else 1632 buf.append("(").append(a).append(")"); 1633 } 1634 buf.append(")"); 1635 return buf.toString(); 1636 } 1637 1638 private boolean typesMatch(NamedFunction function, Object ... arguments) { 1639 assert(arguments.length == function.arity()) : "arity mismatch: arguments.length=" + arguments.length + " == function.arity()=" + function.arity() + " in " + debugString(); 1640 for (int i = 0; i < arguments.length; i++) { 1641 assert (typesMatch(function.parameterType(i), arguments[i])) : "types don't match: function.parameterType(" + i + ")=" + function.parameterType(i) + ", arguments[" + i + "]=" + arguments[i] + " in " + debugString(); 1642 } 1643 return true; 1644 } 1645 1646 private static boolean typesMatch(BasicType parameterType, Object object) { 1647 if (object instanceof Name) { 1648 return ((Name)object).type == parameterType; 1649 } 1650 switch (parameterType) { 1651 case I_TYPE: return object instanceof Integer; 1652 case J_TYPE: return object instanceof Long; 1653 case F_TYPE: return object instanceof Float; 1654 case D_TYPE: return object instanceof Double; 1655 } 1656 assert(parameterType == L_TYPE); 1657 return true; 1658 } 1659 1660 /** Return the index of the last occurrence of n in the argument array. 1661 * Return -1 if the name is not used. 1662 */ 1663 int lastUseIndex(Name n) { 1664 if (arguments == null) return -1; 1665 for (int i = arguments.length; --i >= 0; ) { 1666 if (arguments[i] == n) return i; 1667 } 1668 return -1; 1669 } 1670 1671 /** Return the number of occurrences of n in the argument array. 1672 * Return 0 if the name is not used. 1673 */ 1674 int useCount(Name n) { 1675 if (arguments == null) return 0; 1676 int count = 0; 1677 for (int i = arguments.length; --i >= 0; ) { 1678 if (arguments[i] == n) ++count; 1679 } 1680 return count; 1681 } 1682 1683 boolean contains(Name n) { 1684 return this == n || lastUseIndex(n) >= 0; 1685 } 1686 1687 public boolean equals(Name that) { 1688 if (this == that) return true; 1689 if (isParam()) 1690 // each parameter is a unique atom 1691 return false; // this != that 1692 return 1693 //this.index == that.index && 1694 this.type == that.type && 1695 this.function.equals(that.function) && 1696 Arrays.equals(this.arguments, that.arguments); 1697 } 1698 @Override 1699 public boolean equals(Object x) { 1700 return x instanceof Name && equals((Name)x); 1701 } 1702 @Override 1703 public int hashCode() { 1704 if (isParam()) 1705 return index | (type.ordinal() << 8); 1706 return function.hashCode() ^ Arrays.hashCode(arguments); 1707 } 1708 } 1709 1710 /** Return the index of the last name which contains n as an argument. 1711 * Return -1 if the name is not used. Return names.length if it is the return value. 1712 */ 1713 int lastUseIndex(Name n) { 1714 int ni = n.index, nmax = names.length; 1715 assert(names[ni] == n); 1716 if (result == ni) return nmax; // live all the way beyond the end 1717 for (int i = nmax; --i > ni; ) { 1718 if (names[i].lastUseIndex(n) >= 0) 1719 return i; 1720 } 1721 return -1; 1722 } 1723 1724 /** Return the number of times n is used as an argument or return value. */ 1725 int useCount(Name n) { 1726 int nmax = names.length; 1727 int end = lastUseIndex(n); 1728 if (end < 0) return 0; 1729 int count = 0; 1730 if (end == nmax) { count++; end--; } 1731 int beg = n.index() + 1; 1732 if (beg < arity) beg = arity; 1733 for (int i = beg; i <= end; i++) { 1734 count += names[i].useCount(n); 1735 } 1736 return count; 1737 } 1738 1739 static Name argument(int which, BasicType type) { 1740 if (which >= INTERNED_ARGUMENT_LIMIT) 1741 return new Name(which, type); 1742 return INTERNED_ARGUMENTS[type.ordinal()][which]; 1743 } 1744 static Name internArgument(Name n) { 1745 assert(n.isParam()) : "not param: " + n; 1746 assert(n.index < INTERNED_ARGUMENT_LIMIT); 1747 if (n.constraint != null) return n; 1748 return argument(n.index, n.type); 1749 } 1750 static Name[] arguments(int extra, MethodType types) { 1751 int length = types.parameterCount(); 1752 Name[] names = new Name[length + extra]; 1753 for (int i = 0; i < length; i++) 1754 names[i] = argument(i, basicType(types.parameterType(i))); 1755 return names; 1756 } 1757 static final int INTERNED_ARGUMENT_LIMIT = 10; 1758 private static final Name[][] INTERNED_ARGUMENTS 1759 = new Name[ARG_TYPE_LIMIT][INTERNED_ARGUMENT_LIMIT]; 1760 static { 1761 for (BasicType type : BasicType.ARG_TYPES) { 1762 int ord = type.ordinal(); 1763 for (int i = 0; i < INTERNED_ARGUMENTS[ord].length; i++) { 1764 INTERNED_ARGUMENTS[ord][i] = new Name(i, type); 1765 } 1766 } 1767 } 1768 1769 private static final MemberName.Factory IMPL_NAMES = MemberName.getFactory(); 1770 1771 static LambdaForm identityForm(BasicType type) { 1772 int ord = type.ordinal(); 1773 LambdaForm form = LF_identity[ord]; 1774 if (form != null) { 1775 return form; 1776 } 1777 createFormsFor(type); 1778 return LF_identity[ord]; 1779 } 1780 1781 static LambdaForm zeroForm(BasicType type) { 1782 int ord = type.ordinal(); 1783 LambdaForm form = LF_zero[ord]; 1784 if (form != null) { 1785 return form; 1786 } 1787 createFormsFor(type); 1788 return LF_zero[ord]; 1789 } 1790 1791 static NamedFunction identity(BasicType type) { 1792 int ord = type.ordinal(); 1793 NamedFunction function = NF_identity[ord]; 1794 if (function != null) { 1795 return function; 1796 } 1797 createFormsFor(type); 1798 return NF_identity[ord]; 1799 } 1800 1801 static NamedFunction constantZero(BasicType type) { 1802 int ord = type.ordinal(); 1803 NamedFunction function = NF_zero[ord]; 1804 if (function != null) { 1805 return function; 1806 } 1807 createFormsFor(type); 1808 return NF_zero[ord]; 1809 } 1810 1811 private static final @Stable LambdaForm[] LF_identity = new LambdaForm[TYPE_LIMIT]; 1812 private static final @Stable LambdaForm[] LF_zero = new LambdaForm[TYPE_LIMIT]; 1813 private static final @Stable NamedFunction[] NF_identity = new NamedFunction[TYPE_LIMIT]; 1814 private static final @Stable NamedFunction[] NF_zero = new NamedFunction[TYPE_LIMIT]; 1815 1816 private static synchronized void createFormsFor(BasicType type) { 1817 final int ord = type.ordinal(); 1818 LambdaForm idForm = LF_identity[ord]; 1819 if (idForm != null) { 1820 return; 1821 } 1822 char btChar = type.basicTypeChar(); 1823 boolean isVoid = (type == V_TYPE); 1824 Class<?> btClass = type.btClass; 1825 MethodType zeType = MethodType.methodType(btClass); 1826 MethodType idType = (isVoid) ? zeType : zeType.appendParameterTypes(btClass); 1827 1828 // Look up symbolic names. It might not be necessary to have these, 1829 // but if we need to emit direct references to bytecodes, it helps. 1830 // Zero is built from a call to an identity function with a constant zero input. 1831 MemberName idMem = new MemberName(LambdaForm.class, "identity_"+btChar, idType, REF_invokeStatic); 1832 MemberName zeMem = null; 1833 try { 1834 idMem = IMPL_NAMES.resolveOrFail(REF_invokeStatic, idMem, null, NoSuchMethodException.class); 1835 if (!isVoid) { 1836 zeMem = new MemberName(LambdaForm.class, "zero_"+btChar, zeType, REF_invokeStatic); 1837 zeMem = IMPL_NAMES.resolveOrFail(REF_invokeStatic, zeMem, null, NoSuchMethodException.class); 1838 } 1839 } catch (IllegalAccessException|NoSuchMethodException ex) { 1840 throw newInternalError(ex); 1841 } 1842 1843 NamedFunction idFun; 1844 LambdaForm zeForm; 1845 NamedFunction zeFun; 1846 1847 // Create the LFs and NamedFunctions. Precompiling LFs to byte code is needed to break circular 1848 // bootstrap dependency on this method in case we're interpreting LFs 1849 if (isVoid) { 1850 Name[] idNames = new Name[] { argument(0, L_TYPE) }; 1851 idForm = new LambdaForm(idMem.getName(), 1, idNames, VOID_RESULT); 1852 idForm.compileToBytecode(); 1853 idFun = new NamedFunction(idMem, SimpleMethodHandle.make(idMem.getInvocationType(), idForm)); 1854 1855 zeForm = idForm; 1856 zeFun = idFun; 1857 } else { 1858 Name[] idNames = new Name[] { argument(0, L_TYPE), argument(1, type) }; 1859 idForm = new LambdaForm(idMem.getName(), 2, idNames, 1); 1860 idForm.compileToBytecode(); 1861 idFun = new NamedFunction(idMem, SimpleMethodHandle.make(idMem.getInvocationType(), idForm)); 1862 1863 Object zeValue = Wrapper.forBasicType(btChar).zero(); 1864 Name[] zeNames = new Name[] { argument(0, L_TYPE), new Name(idFun, zeValue) }; 1865 zeForm = new LambdaForm(zeMem.getName(), 1, zeNames, 1); 1866 zeForm.compileToBytecode(); 1867 zeFun = new NamedFunction(zeMem, SimpleMethodHandle.make(zeMem.getInvocationType(), zeForm)); 1868 } 1869 1870 LF_zero[ord] = zeForm; 1871 NF_zero[ord] = zeFun; 1872 LF_identity[ord] = idForm; 1873 NF_identity[ord] = idFun; 1874 1875 assert(idFun.isIdentity()); 1876 assert(zeFun.isConstantZero()); 1877 assert(new Name(zeFun).isConstantZero()); 1878 } 1879 1880 // Avoid appealing to ValueConversions at bootstrap time: 1881 private static int identity_I(int x) { return x; } 1882 private static long identity_J(long x) { return x; } 1883 private static float identity_F(float x) { return x; } 1884 private static double identity_D(double x) { return x; } 1885 private static Object identity_L(Object x) { return x; } 1886 private static void identity_V() { return; } 1887 private static int zero_I() { return 0; } 1888 private static long zero_J() { return 0; } 1889 private static float zero_F() { return 0; } 1890 private static double zero_D() { return 0; } 1891 private static Object zero_L() { return null; } 1892 1893 /** 1894 * Internal marker for byte-compiled LambdaForms. 1895 */ 1896 /*non-public*/ 1897 @Target(ElementType.METHOD) 1898 @Retention(RetentionPolicy.RUNTIME) 1899 @interface Compiled { 1900 } 1901 1902 /** 1903 * Internal marker for LambdaForm interpreter frames. 1904 */ 1905 /*non-public*/ 1906 @Target(ElementType.METHOD) 1907 @Retention(RetentionPolicy.RUNTIME) 1908 @interface Hidden { 1909 } 1910 1911 private static final HashMap<String,Integer> DEBUG_NAME_COUNTERS; 1912 static { 1913 if (debugEnabled()) 1914 DEBUG_NAME_COUNTERS = new HashMap<>(); 1915 else 1916 DEBUG_NAME_COUNTERS = null; 1917 } 1918 1919 // Put this last, so that previous static inits can run before. 1920 static { 1921 if (USE_PREDEFINED_INTERPRET_METHODS) 1922 computeInitialPreparedForms(); 1923 NamedFunction.initializeInvokers(); 1924 } 1925 1926 // The following hack is necessary in order to suppress TRACE_INTERPRETER 1927 // during execution of the static initializes of this class. 1928 // Turning on TRACE_INTERPRETER too early will cause 1929 // stack overflows and other misbehavior during attempts to trace events 1930 // that occur during LambdaForm.<clinit>. 1931 // Therefore, do not move this line higher in this file, and do not remove. 1932 private static final boolean TRACE_INTERPRETER = MethodHandleStatics.TRACE_INTERPRETER; 1933 }