1 /*
2 * Copyright (c) 2014, 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 sun.invoke.util.Wrapper;
29
30 import java.lang.ref.SoftReference;
31 import java.util.Arrays;
32 import java.util.Collections;
33 import java.util.concurrent.ConcurrentHashMap;
34
35 import static java.lang.invoke.LambdaForm.*;
36 import static java.lang.invoke.LambdaForm.BasicType.*;
37 import static java.lang.invoke.MethodHandleImpl.Intrinsic;
38 import static java.lang.invoke.MethodHandleImpl.NF_loop;
39
40 /** Transforms on LFs.
41 * A lambda-form editor can derive new LFs from its base LF.
42 * The editor can cache derived LFs, which simplifies the reuse of their underlying bytecodes.
43 * To support this caching, a LF has an optional pointer to its editor.
44 */
45 class LambdaFormEditor {
46 final LambdaForm lambdaForm;
47
48 private LambdaFormEditor(LambdaForm lambdaForm) {
49 this.lambdaForm = lambdaForm;
50 }
51
52 // Factory method.
53 static LambdaFormEditor lambdaFormEditor(LambdaForm lambdaForm) {
54 // TO DO: Consider placing intern logic here, to cut down on duplication.
55 // lambdaForm = findPreexistingEquivalent(lambdaForm)
56
57 // Always use uncustomized version for editing.
58 // It helps caching and customized LambdaForms reuse transformCache field to keep a link to uncustomized version.
59 return new LambdaFormEditor(lambdaForm.uncustomize());
60 }
61
62 /** A description of a cached transform, possibly associated with the result of the transform.
63 * The logical content is a sequence of byte values, starting with a kind value.
64 * The sequence is unterminated, ending with an indefinite number of zero bytes.
65 * Sequences that are simple (short enough and with small enough values) pack into a 64-bit long.
66 */
67 private static final class Transform extends SoftReference<LambdaForm> {
68 final long packedBytes;
69 final byte[] fullBytes;
70
71 // maybe add more for guard with test, catch exception, pointwise type conversions
72 private static final byte
73 BIND_ARG = 1,
74 ADD_ARG = 2,
75 DUP_ARG = 3,
76 SPREAD_ARGS = 4,
77 FILTER_ARG = 5,
78 FILTER_RETURN = 6,
79 FILTER_RETURN_TO_ZERO = 7,
80 COLLECT_ARGS = 8,
81 COLLECT_ARGS_TO_VOID = 9,
82 COLLECT_ARGS_TO_ARRAY = 10,
83 FOLD_ARGS = 11,
84 FOLD_ARGS_TO_VOID = 12,
85 PERMUTE_ARGS = 13,
86 LOCAL_TYPES = 14,
87 FOLD_SELECT_ARGS = 15,
88 FOLD_SELECT_ARGS_TO_VOID = 16;
89
90 private static final boolean STRESS_TEST = false; // turn on to disable most packing
91 private static final int
92 PACKED_BYTE_SIZE = (STRESS_TEST ? 2 : 4),
93 PACKED_BYTE_MASK = (1 << PACKED_BYTE_SIZE) - 1,
94 PACKED_BYTE_MAX_LENGTH = (STRESS_TEST ? 3 : 64 / PACKED_BYTE_SIZE);
95
96 private static long packedBytes(byte[] bytes) {
97 if (bytes.length > PACKED_BYTE_MAX_LENGTH) return 0;
98 long pb = 0;
99 int bitset = 0;
100 for (int i = 0; i < bytes.length; i++) {
101 int b = bytes[i] & 0xFF;
102 bitset |= b;
103 pb |= (long)b << (i * PACKED_BYTE_SIZE);
104 }
105 if (!inRange(bitset))
106 return 0;
107 return pb;
108 }
109 private static long packedBytes(int b0, int b1) {
110 assert(inRange(b0 | b1));
111 return ( (b0 << 0*PACKED_BYTE_SIZE)
112 | (b1 << 1*PACKED_BYTE_SIZE));
113 }
114 private static long packedBytes(int b0, int b1, int b2) {
115 assert(inRange(b0 | b1 | b2));
116 return ( (b0 << 0*PACKED_BYTE_SIZE)
117 | (b1 << 1*PACKED_BYTE_SIZE)
118 | (b2 << 2*PACKED_BYTE_SIZE));
119 }
120 private static long packedBytes(int b0, int b1, int b2, int b3) {
121 assert(inRange(b0 | b1 | b2 | b3));
122 return ( (b0 << 0*PACKED_BYTE_SIZE)
123 | (b1 << 1*PACKED_BYTE_SIZE)
124 | (b2 << 2*PACKED_BYTE_SIZE)
125 | (b3 << 3*PACKED_BYTE_SIZE));
126 }
127 private static boolean inRange(int bitset) {
128 assert((bitset & 0xFF) == bitset); // incoming values must fit in *unsigned* byte
129 return ((bitset & ~PACKED_BYTE_MASK) == 0);
130 }
131 private static byte[] fullBytes(int... byteValues) {
132 byte[] bytes = new byte[byteValues.length];
133 int i = 0;
134 for (int bv : byteValues) {
135 bytes[i++] = bval(bv);
136 }
137 assert(packedBytes(bytes) == 0);
138 return bytes;
139 }
140
141 private Transform(long packedBytes, byte[] fullBytes, LambdaForm result) {
142 super(result);
143 this.packedBytes = packedBytes;
144 this.fullBytes = fullBytes;
145 }
146 private Transform(long packedBytes) {
147 this(packedBytes, null, null);
148 assert(packedBytes != 0);
149 }
150 private Transform(byte[] fullBytes) {
151 this(0, fullBytes, null);
152 }
153
154 private static byte bval(int b) {
155 assert((b & 0xFF) == b); // incoming value must fit in *unsigned* byte
156 return (byte)b;
157 }
158 static Transform of(byte k, int b1) {
159 byte b0 = bval(k);
160 if (inRange(b0 | b1))
161 return new Transform(packedBytes(b0, b1));
162 else
163 return new Transform(fullBytes(b0, b1));
164 }
165 static Transform of(byte b0, int b1, int b2) {
166 if (inRange(b0 | b1 | b2))
167 return new Transform(packedBytes(b0, b1, b2));
168 else
169 return new Transform(fullBytes(b0, b1, b2));
170 }
171 static Transform of(byte b0, int b1, int b2, int b3) {
172 if (inRange(b0 | b1 | b2 | b3))
173 return new Transform(packedBytes(b0, b1, b2, b3));
174 else
175 return new Transform(fullBytes(b0, b1, b2, b3));
176 }
177 private static final byte[] NO_BYTES = {};
178 static Transform of(byte kind, int... b123) {
179 return ofBothArrays(kind, b123, NO_BYTES);
180 }
181 static Transform of(byte kind, int b1, byte[] b234) {
182 return ofBothArrays(kind, new int[]{ b1 }, b234);
183 }
184 static Transform of(byte kind, int b1, int b2, byte[] b345) {
185 return ofBothArrays(kind, new int[]{ b1, b2 }, b345);
186 }
187 private static Transform ofBothArrays(byte kind, int[] b123, byte[] b456) {
188 byte[] fullBytes = new byte[1 + b123.length + b456.length];
189 int i = 0;
190 fullBytes[i++] = bval(kind);
191 for (int bv : b123) {
192 fullBytes[i++] = bval(bv);
193 }
194 for (byte bv : b456) {
195 fullBytes[i++] = bv;
196 }
197 long packedBytes = packedBytes(fullBytes);
198 if (packedBytes != 0)
199 return new Transform(packedBytes);
200 else
201 return new Transform(fullBytes);
202 }
203
204 Transform withResult(LambdaForm result) {
205 return new Transform(this.packedBytes, this.fullBytes, result);
206 }
207
208 @Override
209 public boolean equals(Object obj) {
210 return obj instanceof Transform && equals((Transform)obj);
211 }
212 public boolean equals(Transform that) {
213 return this.packedBytes == that.packedBytes && Arrays.equals(this.fullBytes, that.fullBytes);
214 }
215 @Override
216 public int hashCode() {
217 if (packedBytes != 0) {
218 assert(fullBytes == null);
219 return Long.hashCode(packedBytes);
220 }
221 return Arrays.hashCode(fullBytes);
222 }
223 @Override
224 public String toString() {
225 StringBuilder buf = new StringBuilder();
226 long bits = packedBytes;
227 if (bits != 0) {
228 buf.append("(");
229 while (bits != 0) {
230 buf.append(bits & PACKED_BYTE_MASK);
231 bits >>>= PACKED_BYTE_SIZE;
232 if (bits != 0) buf.append(",");
233 }
234 buf.append(")");
235 }
236 if (fullBytes != null) {
237 buf.append("unpacked");
238 buf.append(Arrays.toString(fullBytes));
239 }
240 LambdaForm result = get();
241 if (result != null) {
242 buf.append(" result=");
243 buf.append(result);
244 }
245 return buf.toString();
246 }
247 }
248
249 /** Find a previously cached transform equivalent to the given one, and return its result. */
250 private LambdaForm getInCache(Transform key) {
251 assert(key.get() == null);
252 // The transformCache is one of null, Transform, Transform[], or ConcurrentHashMap.
253 Object c = lambdaForm.transformCache;
254 Transform k = null;
255 if (c instanceof ConcurrentHashMap) {
256 @SuppressWarnings("unchecked")
257 ConcurrentHashMap<Transform,Transform> m = (ConcurrentHashMap<Transform,Transform>) c;
258 k = m.get(key);
259 } else if (c == null) {
260 return null;
261 } else if (c instanceof Transform) {
262 // one-element cache avoids overhead of an array
263 Transform t = (Transform)c;
264 if (t.equals(key)) k = t;
265 } else {
266 Transform[] ta = (Transform[])c;
267 for (int i = 0; i < ta.length; i++) {
268 Transform t = ta[i];
269 if (t == null) break;
270 if (t.equals(key)) { k = t; break; }
271 }
272 }
273 assert(k == null || key.equals(k));
274 return (k != null) ? k.get() : null;
275 }
276
277 /** Arbitrary but reasonable limits on Transform[] size for cache. */
278 private static final int MIN_CACHE_ARRAY_SIZE = 4, MAX_CACHE_ARRAY_SIZE = 16;
279
280 /** Cache a transform with its result, and return that result.
281 * But if an equivalent transform has already been cached, return its result instead.
282 */
283 private LambdaForm putInCache(Transform key, LambdaForm form) {
284 key = key.withResult(form);
285 for (int pass = 0; ; pass++) {
286 Object c = lambdaForm.transformCache;
287 if (c instanceof ConcurrentHashMap) {
288 @SuppressWarnings("unchecked")
289 ConcurrentHashMap<Transform,Transform> m = (ConcurrentHashMap<Transform,Transform>) c;
290 Transform k = m.putIfAbsent(key, key);
291 if (k == null) return form;
292 LambdaForm result = k.get();
293 if (result != null) {
294 return result;
295 } else {
296 if (m.replace(key, k, key)) {
297 return form;
298 } else {
299 continue;
300 }
301 }
302 }
303 assert(pass == 0);
304 synchronized (lambdaForm) {
305 c = lambdaForm.transformCache;
306 if (c instanceof ConcurrentHashMap)
307 continue;
308 if (c == null) {
309 lambdaForm.transformCache = key;
310 return form;
311 }
312 Transform[] ta;
313 if (c instanceof Transform) {
314 Transform k = (Transform)c;
315 if (k.equals(key)) {
316 LambdaForm result = k.get();
317 if (result == null) {
318 lambdaForm.transformCache = key;
319 return form;
320 } else {
321 return result;
322 }
323 } else if (k.get() == null) { // overwrite stale entry
324 lambdaForm.transformCache = key;
325 return form;
326 }
327 // expand one-element cache to small array
328 ta = new Transform[MIN_CACHE_ARRAY_SIZE];
329 ta[0] = k;
330 lambdaForm.transformCache = ta;
331 } else {
332 // it is already expanded
333 ta = (Transform[])c;
334 }
335 int len = ta.length;
336 int stale = -1;
337 int i;
338 for (i = 0; i < len; i++) {
339 Transform k = ta[i];
340 if (k == null) {
341 break;
342 }
343 if (k.equals(key)) {
344 LambdaForm result = k.get();
345 if (result == null) {
346 ta[i] = key;
347 return form;
348 } else {
349 return result;
350 }
351 } else if (stale < 0 && k.get() == null) {
352 stale = i; // remember 1st stale entry index
353 }
354 }
355 if (i < len || stale >= 0) {
356 // just fall through to cache update
357 } else if (len < MAX_CACHE_ARRAY_SIZE) {
358 len = Math.min(len * 2, MAX_CACHE_ARRAY_SIZE);
359 ta = Arrays.copyOf(ta, len);
360 lambdaForm.transformCache = ta;
361 } else {
362 ConcurrentHashMap<Transform, Transform> m = new ConcurrentHashMap<>(MAX_CACHE_ARRAY_SIZE * 2);
363 for (Transform k : ta) {
364 m.put(k, k);
365 }
366 lambdaForm.transformCache = m;
367 // The second iteration will update for this query, concurrently.
368 continue;
369 }
370 int idx = (stale >= 0) ? stale : i;
371 ta[idx] = key;
372 return form;
373 }
374 }
375 }
376
377 private LambdaFormBuffer buffer() {
378 return new LambdaFormBuffer(lambdaForm);
379 }
380
381 /// Editing methods for method handles. These need to have fast paths.
382
383 private BoundMethodHandle.SpeciesData oldSpeciesData() {
384 return BoundMethodHandle.speciesData(lambdaForm);
385 }
386 private BoundMethodHandle.SpeciesData newSpeciesData(BasicType type) {
387 return oldSpeciesData().extendWith(type);
388 }
389
390 BoundMethodHandle bindArgumentL(BoundMethodHandle mh, int pos, Object value) {
391 assert(mh.speciesData() == oldSpeciesData());
392 BasicType bt = L_TYPE;
393 MethodType type2 = bindArgumentType(mh, pos, bt);
394 LambdaForm form2 = bindArgumentForm(1+pos);
395 return mh.copyWithExtendL(type2, form2, value);
396 }
397 BoundMethodHandle bindArgumentI(BoundMethodHandle mh, int pos, int value) {
398 assert(mh.speciesData() == oldSpeciesData());
399 BasicType bt = I_TYPE;
400 MethodType type2 = bindArgumentType(mh, pos, bt);
401 LambdaForm form2 = bindArgumentForm(1+pos);
402 return mh.copyWithExtendI(type2, form2, value);
403 }
404
405 BoundMethodHandle bindArgumentJ(BoundMethodHandle mh, int pos, long value) {
406 assert(mh.speciesData() == oldSpeciesData());
407 BasicType bt = J_TYPE;
408 MethodType type2 = bindArgumentType(mh, pos, bt);
409 LambdaForm form2 = bindArgumentForm(1+pos);
410 return mh.copyWithExtendJ(type2, form2, value);
411 }
412
413 BoundMethodHandle bindArgumentF(BoundMethodHandle mh, int pos, float value) {
414 assert(mh.speciesData() == oldSpeciesData());
415 BasicType bt = F_TYPE;
416 MethodType type2 = bindArgumentType(mh, pos, bt);
417 LambdaForm form2 = bindArgumentForm(1+pos);
418 return mh.copyWithExtendF(type2, form2, value);
419 }
420
421 BoundMethodHandle bindArgumentD(BoundMethodHandle mh, int pos, double value) {
422 assert(mh.speciesData() == oldSpeciesData());
423 BasicType bt = D_TYPE;
424 MethodType type2 = bindArgumentType(mh, pos, bt);
425 LambdaForm form2 = bindArgumentForm(1+pos);
426 return mh.copyWithExtendD(type2, form2, value);
427 }
428
429 private MethodType bindArgumentType(BoundMethodHandle mh, int pos, BasicType bt) {
430 assert(mh.form.uncustomize() == lambdaForm);
431 assert(mh.form.names[1+pos].type == bt);
432 assert(BasicType.basicType(mh.type().parameterType(pos)) == bt);
433 return mh.type().dropParameterTypes(pos, pos+1);
434 }
435
436 /// Editing methods for lambda forms.
437 // Each editing method can (potentially) cache the edited LF so that it can be reused later.
438
439 LambdaForm bindArgumentForm(int pos) {
440 Transform key = Transform.of(Transform.BIND_ARG, pos);
441 LambdaForm form = getInCache(key);
442 if (form != null) {
443 assert(form.parameterConstraint(0) == newSpeciesData(lambdaForm.parameterType(pos)));
444 return form;
445 }
446 LambdaFormBuffer buf = buffer();
447 buf.startEdit();
448
449 BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
450 BoundMethodHandle.SpeciesData newData = newSpeciesData(lambdaForm.parameterType(pos));
451 Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
452 Name newBaseAddress;
453 NamedFunction getter = newData.getterFunction(oldData.fieldCount());
454
455 if (pos != 0) {
456 // The newly created LF will run with a different BMH.
457 // Switch over any pre-existing BMH field references to the new BMH class.
458 buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
459 newBaseAddress = oldBaseAddress.withConstraint(newData);
460 buf.renameParameter(0, newBaseAddress);
461 buf.replaceParameterByNewExpression(pos, new Name(getter, newBaseAddress));
462 } else {
463 // cannot bind the MH arg itself, unless oldData is empty
464 assert(oldData == BoundMethodHandle.SpeciesData.EMPTY);
465 newBaseAddress = new Name(L_TYPE).withConstraint(newData);
466 buf.replaceParameterByNewExpression(0, new Name(getter, newBaseAddress));
467 buf.insertParameter(0, newBaseAddress);
468 }
469
470 form = buf.endEdit();
471 return putInCache(key, form);
472 }
473
474 LambdaForm addArgumentForm(int pos, BasicType type) {
475 Transform key = Transform.of(Transform.ADD_ARG, pos, type.ordinal());
476 LambdaForm form = getInCache(key);
477 if (form != null) {
478 assert(form.arity == lambdaForm.arity+1);
479 assert(form.parameterType(pos) == type);
480 return form;
481 }
482 LambdaFormBuffer buf = buffer();
483 buf.startEdit();
484
485 buf.insertParameter(pos, new Name(type));
486
487 form = buf.endEdit();
488 return putInCache(key, form);
489 }
490
491 LambdaForm dupArgumentForm(int srcPos, int dstPos) {
492 Transform key = Transform.of(Transform.DUP_ARG, srcPos, dstPos);
493 LambdaForm form = getInCache(key);
494 if (form != null) {
495 assert(form.arity == lambdaForm.arity-1);
496 return form;
497 }
498 LambdaFormBuffer buf = buffer();
499 buf.startEdit();
500
501 assert(lambdaForm.parameter(srcPos).constraint == null);
502 assert(lambdaForm.parameter(dstPos).constraint == null);
503 buf.replaceParameterByCopy(dstPos, srcPos);
504
505 form = buf.endEdit();
506 return putInCache(key, form);
507 }
508
509 LambdaForm spreadArgumentsForm(int pos, Class<?> arrayType, int arrayLength) {
510 Class<?> elementType = arrayType.getComponentType();
511 Class<?> erasedArrayType = arrayType;
512 if (!elementType.isPrimitive())
513 erasedArrayType = Object[].class;
514 BasicType bt = basicType(elementType);
515 int elementTypeKey = bt.ordinal();
516 if (bt.basicTypeClass() != elementType) {
517 if (elementType.isPrimitive()) {
518 elementTypeKey = TYPE_LIMIT + Wrapper.forPrimitiveType(elementType).ordinal();
519 }
520 }
521 Transform key = Transform.of(Transform.SPREAD_ARGS, pos, elementTypeKey, arrayLength);
522 LambdaForm form = getInCache(key);
523 if (form != null) {
524 assert(form.arity == lambdaForm.arity - arrayLength + 1);
525 return form;
526 }
527 LambdaFormBuffer buf = buffer();
528 buf.startEdit();
529
530 assert(pos <= MethodType.MAX_JVM_ARITY);
531 assert(pos + arrayLength <= lambdaForm.arity);
532 assert(pos > 0); // cannot spread the MH arg itself
533
534 Name spreadParam = new Name(L_TYPE);
535 Name checkSpread = new Name(MethodHandleImpl.NF_checkSpreadArgument, spreadParam, arrayLength);
536
537 // insert the new expressions
538 int exprPos = lambdaForm.arity();
539 buf.insertExpression(exprPos++, checkSpread);
540 // adjust the arguments
541 MethodHandle aload = MethodHandles.arrayElementGetter(erasedArrayType);
542 for (int i = 0; i < arrayLength; i++) {
543 Name loadArgument = new Name(aload, spreadParam, i);
544 buf.insertExpression(exprPos + i, loadArgument);
545 buf.replaceParameterByCopy(pos + i, exprPos + i);
546 }
547 buf.insertParameter(pos, spreadParam);
548
549 form = buf.endEdit();
550 return putInCache(key, form);
551 }
552
553 LambdaForm collectArgumentsForm(int pos, MethodType collectorType) {
554 int collectorArity = collectorType.parameterCount();
555 boolean dropResult = (collectorType.returnType() == void.class);
556 if (collectorArity == 1 && !dropResult) {
557 return filterArgumentForm(pos, basicType(collectorType.parameterType(0)));
558 }
559 byte[] newTypes = BasicType.basicTypesOrd(collectorType.parameterArray());
560 byte kind = (dropResult
561 ? Transform.COLLECT_ARGS_TO_VOID
562 : Transform.COLLECT_ARGS);
563 if (dropResult && collectorArity == 0) pos = 1; // pure side effect
564 Transform key = Transform.of(kind, pos, collectorArity, newTypes);
565 LambdaForm form = getInCache(key);
566 if (form != null) {
567 assert(form.arity == lambdaForm.arity - (dropResult ? 0 : 1) + collectorArity);
568 return form;
569 }
570 form = makeArgumentCombinationForm(pos, collectorType, false, dropResult);
571 return putInCache(key, form);
572 }
573
574 LambdaForm collectArgumentArrayForm(int pos, MethodHandle arrayCollector) {
575 MethodType collectorType = arrayCollector.type();
576 int collectorArity = collectorType.parameterCount();
577 assert(arrayCollector.intrinsicName() == Intrinsic.NEW_ARRAY);
578 Class<?> arrayType = collectorType.returnType();
579 Class<?> elementType = arrayType.getComponentType();
580 BasicType argType = basicType(elementType);
581 int argTypeKey = argType.ordinal();
582 if (argType.basicTypeClass() != elementType) {
583 // return null if it requires more metadata (like String[].class)
584 if (!elementType.isPrimitive())
585 return null;
586 argTypeKey = TYPE_LIMIT + Wrapper.forPrimitiveType(elementType).ordinal();
587 }
588 assert(collectorType.parameterList().equals(Collections.nCopies(collectorArity, elementType)));
589 byte kind = Transform.COLLECT_ARGS_TO_ARRAY;
590 Transform key = Transform.of(kind, pos, collectorArity, argTypeKey);
591 LambdaForm form = getInCache(key);
592 if (form != null) {
593 assert(form.arity == lambdaForm.arity - 1 + collectorArity);
594 return form;
595 }
596 LambdaFormBuffer buf = buffer();
597 buf.startEdit();
598
599 assert(pos + 1 <= lambdaForm.arity);
600 assert(pos > 0); // cannot filter the MH arg itself
601
602 Name[] newParams = new Name[collectorArity];
603 for (int i = 0; i < collectorArity; i++) {
604 newParams[i] = new Name(pos + i, argType);
605 }
606 Name callCombiner = new Name(arrayCollector, (Object[]) /*...*/ newParams);
607
608 // insert the new expression
609 int exprPos = lambdaForm.arity();
610 buf.insertExpression(exprPos, callCombiner);
611
612 // insert new arguments
613 int argPos = pos + 1; // skip result parameter
614 for (Name newParam : newParams) {
615 buf.insertParameter(argPos++, newParam);
616 }
617 assert(buf.lastIndexOf(callCombiner) == exprPos+newParams.length);
618 buf.replaceParameterByCopy(pos, exprPos+newParams.length);
619
620 form = buf.endEdit();
621 return putInCache(key, form);
622 }
623
624 LambdaForm filterArgumentForm(int pos, BasicType newType) {
625 Transform key = Transform.of(Transform.FILTER_ARG, pos, newType.ordinal());
626 LambdaForm form = getInCache(key);
627 if (form != null) {
628 assert(form.arity == lambdaForm.arity);
629 assert(form.parameterType(pos) == newType);
630 return form;
631 }
632
633 BasicType oldType = lambdaForm.parameterType(pos);
634 MethodType filterType = MethodType.methodType(oldType.basicTypeClass(),
635 newType.basicTypeClass());
636 form = makeArgumentCombinationForm(pos, filterType, false, false);
637 return putInCache(key, form);
638 }
639
640 private LambdaForm makeArgumentCombinationForm(int pos,
641 MethodType combinerType,
642 boolean keepArguments, boolean dropResult) {
643 LambdaFormBuffer buf = buffer();
644 buf.startEdit();
645 int combinerArity = combinerType.parameterCount();
646 int resultArity = (dropResult ? 0 : 1);
647
648 assert(pos <= MethodType.MAX_JVM_ARITY);
649 assert(pos + resultArity + (keepArguments ? combinerArity : 0) <= lambdaForm.arity);
650 assert(pos > 0); // cannot filter the MH arg itself
651 assert(combinerType == combinerType.basicType());
652 assert(combinerType.returnType() != void.class || dropResult);
653
654 BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
655 BoundMethodHandle.SpeciesData newData = newSpeciesData(L_TYPE);
656
657 // The newly created LF will run with a different BMH.
658 // Switch over any pre-existing BMH field references to the new BMH class.
659 Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
660 buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
661 Name newBaseAddress = oldBaseAddress.withConstraint(newData);
662 buf.renameParameter(0, newBaseAddress);
663
664 Name getCombiner = new Name(newData.getterFunction(oldData.fieldCount()), newBaseAddress);
665 Object[] combinerArgs = new Object[1 + combinerArity];
666 combinerArgs[0] = getCombiner;
667 Name[] newParams;
668 if (keepArguments) {
669 newParams = new Name[0];
670 System.arraycopy(lambdaForm.names, pos + resultArity,
671 combinerArgs, 1, combinerArity);
672 } else {
673 newParams = new Name[combinerArity];
674 for (int i = 0; i < newParams.length; i++) {
675 newParams[i] = new Name(pos + i, basicType(combinerType.parameterType(i)));
676 }
677 System.arraycopy(newParams, 0,
678 combinerArgs, 1, combinerArity);
679 }
680 Name callCombiner = new Name(combinerType, combinerArgs);
681
682 // insert the two new expressions
683 int exprPos = lambdaForm.arity();
684 buf.insertExpression(exprPos+0, getCombiner);
685 buf.insertExpression(exprPos+1, callCombiner);
686
687 // insert new arguments, if needed
688 int argPos = pos + resultArity; // skip result parameter
689 for (Name newParam : newParams) {
690 buf.insertParameter(argPos++, newParam);
691 }
692 assert(buf.lastIndexOf(callCombiner) == exprPos+1+newParams.length);
693 if (!dropResult) {
694 buf.replaceParameterByCopy(pos, exprPos+1+newParams.length);
695 }
696
697 return buf.endEdit();
698 }
699
700
701 private LambdaForm makeArgumentCombinationForm(int pos,
702 MethodType combinerType,
703 int[] argPositions,
704 boolean keepArguments,
705 boolean dropResult) {
706 LambdaFormBuffer buf = buffer();
707 buf.startEdit();
708 int combinerArity = combinerType.parameterCount();
709 assert(combinerArity == argPositions.length);
710
711 int resultArity = (dropResult ? 0 : 1);
712
713 assert(pos <= lambdaForm.arity);
714 assert(pos > 0); // cannot filter the MH arg itself
715 assert(combinerType == combinerType.basicType());
716 assert(combinerType.returnType() != void.class || dropResult);
717
718 BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
719 BoundMethodHandle.SpeciesData newData = newSpeciesData(L_TYPE);
720
721 // The newly created LF will run with a different BMH.
722 // Switch over any pre-existing BMH field references to the new BMH class.
723 Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
724 buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
725 Name newBaseAddress = oldBaseAddress.withConstraint(newData);
726 buf.renameParameter(0, newBaseAddress);
727
728 Name getCombiner = new Name(newData.getterFunction(oldData.fieldCount()), newBaseAddress);
729 Object[] combinerArgs = new Object[1 + combinerArity];
730 combinerArgs[0] = getCombiner;
731 Name[] newParams;
732 if (keepArguments) {
733 newParams = new Name[0];
734 for (int i = 0; i < combinerArity; i++) {
735 combinerArgs[i + 1] = lambdaForm.parameter(1 + argPositions[i]);
736 assert (basicType(combinerType.parameterType(i)) == lambdaForm.parameterType(1 + argPositions[i]));
737 }
738 } else {
739 newParams = new Name[combinerArity];
740 for (int i = 0; i < newParams.length; i++) {
741 newParams[i] = lambdaForm.parameter(1 + argPositions[i]);
742 assert (basicType(combinerType.parameterType(i)) == lambdaForm.parameterType(1 + argPositions[i]));
743 }
744 System.arraycopy(newParams, 0,
745 combinerArgs, 1, combinerArity);
746 }
747 Name callCombiner = new Name(combinerType, combinerArgs);
748
749 // insert the two new expressions
750 int exprPos = lambdaForm.arity();
751 buf.insertExpression(exprPos+0, getCombiner);
752 buf.insertExpression(exprPos+1, callCombiner);
753
754 // insert new arguments, if needed
755 int argPos = pos + resultArity; // skip result parameter
756 for (Name newParam : newParams) {
757 buf.insertParameter(argPos++, newParam);
758 }
759 assert(buf.lastIndexOf(callCombiner) == exprPos+1+newParams.length);
760 if (!dropResult) {
761 buf.replaceParameterByCopy(pos, exprPos+1+newParams.length);
762 }
763
764 return buf.endEdit();
765 }
766
767 LambdaForm filterReturnForm(BasicType newType, boolean constantZero) {
768 byte kind = (constantZero ? Transform.FILTER_RETURN_TO_ZERO : Transform.FILTER_RETURN);
769 Transform key = Transform.of(kind, newType.ordinal());
770 LambdaForm form = getInCache(key);
771 if (form != null) {
772 assert(form.arity == lambdaForm.arity);
773 assert(form.returnType() == newType);
774 return form;
775 }
776 LambdaFormBuffer buf = buffer();
777 buf.startEdit();
778
779 int insPos = lambdaForm.names.length;
780 Name callFilter;
781 if (constantZero) {
782 // Synthesize a constant zero value for the given type.
783 if (newType == V_TYPE)
784 callFilter = null;
785 else
786 callFilter = new Name(constantZero(newType));
787 } else {
788 BoundMethodHandle.SpeciesData oldData = oldSpeciesData();
789 BoundMethodHandle.SpeciesData newData = newSpeciesData(L_TYPE);
790
791 // The newly created LF will run with a different BMH.
792 // Switch over any pre-existing BMH field references to the new BMH class.
793 Name oldBaseAddress = lambdaForm.parameter(0); // BMH holding the values
794 buf.replaceFunctions(oldData.getterFunctions(), newData.getterFunctions(), oldBaseAddress);
795 Name newBaseAddress = oldBaseAddress.withConstraint(newData);
796 buf.renameParameter(0, newBaseAddress);
797
798 Name getFilter = new Name(newData.getterFunction(oldData.fieldCount()), newBaseAddress);
799 buf.insertExpression(insPos++, getFilter);
800 BasicType oldType = lambdaForm.returnType();
801 if (oldType == V_TYPE) {
802 MethodType filterType = MethodType.methodType(newType.basicTypeClass());
803 callFilter = new Name(filterType, getFilter);
804 } else {
805 MethodType filterType = MethodType.methodType(newType.basicTypeClass(), oldType.basicTypeClass());
806 callFilter = new Name(filterType, getFilter, lambdaForm.names[lambdaForm.result]);
807 }
808 }
809
810 if (callFilter != null)
811 buf.insertExpression(insPos++, callFilter);
812 buf.setResult(callFilter);
813
814 form = buf.endEdit();
815 return putInCache(key, form);
816 }
817
818 LambdaForm foldArgumentsForm(int foldPos, boolean dropResult, MethodType combinerType) {
819 int combinerArity = combinerType.parameterCount();
820 byte kind = (dropResult ? Transform.FOLD_ARGS_TO_VOID : Transform.FOLD_ARGS);
821 Transform key = Transform.of(kind, foldPos, combinerArity);
822 LambdaForm form = getInCache(key);
823 if (form != null) {
824 assert(form.arity == lambdaForm.arity - (kind == Transform.FOLD_ARGS ? 1 : 0));
825 return form;
826 }
827 form = makeArgumentCombinationForm(foldPos, combinerType, true, dropResult);
828 return putInCache(key, form);
829 }
830
831 LambdaForm foldArgumentsForm(int foldPos, boolean dropResult, MethodType combinerType, int ... argPositions) {
832 byte kind = (dropResult ? Transform.FOLD_SELECT_ARGS_TO_VOID
833 : Transform.FOLD_SELECT_ARGS);
834 int[] keyArgs = Arrays.copyOf(argPositions, argPositions.length + 1);
835 keyArgs[argPositions.length] = foldPos;
836 Transform key = Transform.of(kind, keyArgs);
837 LambdaForm form = getInCache(key);
838 if (form != null) {
839 assert(form.arity == lambdaForm.arity - (kind == Transform.FOLD_SELECT_ARGS ? 1 : 0));
840 return form;
841 }
842 form = makeArgumentCombinationForm(foldPos, combinerType, argPositions, true, dropResult);
843 return putInCache(key, form);
844 }
845
846 LambdaForm permuteArgumentsForm(int skip, int[] reorder) {
847 assert(skip == 1); // skip only the leading MH argument, names[0]
848 int length = lambdaForm.names.length;
849 int outArgs = reorder.length;
850 int inTypes = 0;
851 boolean nullPerm = true;
852 for (int i = 0; i < reorder.length; i++) {
853 int inArg = reorder[i];
854 if (inArg != i) nullPerm = false;
855 inTypes = Math.max(inTypes, inArg+1);
856 }
857 assert(skip + reorder.length == lambdaForm.arity);
858 if (nullPerm) return lambdaForm; // do not bother to cache
859 Transform key = Transform.of(Transform.PERMUTE_ARGS, reorder);
860 LambdaForm form = getInCache(key);
861 if (form != null) {
862 assert(form.arity == skip+inTypes) : form;
863 return form;
864 }
865
866 BasicType[] types = new BasicType[inTypes];
867 for (int i = 0; i < outArgs; i++) {
868 int inArg = reorder[i];
869 types[inArg] = lambdaForm.names[skip + i].type;
870 }
871 assert (skip + outArgs == lambdaForm.arity);
872 assert (permutedTypesMatch(reorder, types, lambdaForm.names, skip));
873 int pos = 0;
874 while (pos < outArgs && reorder[pos] == pos) {
875 pos += 1;
876 }
877 Name[] names2 = new Name[length - outArgs + inTypes];
878 System.arraycopy(lambdaForm.names, 0, names2, 0, skip + pos);
879 int bodyLength = length - lambdaForm.arity;
880 System.arraycopy(lambdaForm.names, skip + outArgs, names2, skip + inTypes, bodyLength);
881 int arity2 = names2.length - bodyLength;
882 int result2 = lambdaForm.result;
883 if (result2 >= 0) {
884 if (result2 < skip + outArgs) {
885 result2 = reorder[result2 - skip];
886 } else {
887 result2 = result2 - outArgs + inTypes;
888 }
889 }
890 for (int j = pos; j < outArgs; j++) {
891 Name n = lambdaForm.names[skip + j];
892 int i = reorder[j];
893 Name n2 = names2[skip + i];
894 if (n2 == null) {
895 names2[skip + i] = n2 = new Name(types[i]);
896 } else {
897 assert (n2.type == types[i]);
898 }
899 for (int k = arity2; k < names2.length; k++) {
900 names2[k] = names2[k].replaceName(n, n2);
901 }
902 }
903 for (int i = skip + pos; i < arity2; i++) {
904 if (names2[i] == null) {
905 names2[i] = argument(i, types[i - skip]);
906 }
907 }
908 for (int j = lambdaForm.arity; j < lambdaForm.names.length; j++) {
909 int i = j - lambdaForm.arity + arity2;
910 Name n = lambdaForm.names[j];
911 Name n2 = names2[i];
912 if (n != n2) {
913 for (int k = i + 1; k < names2.length; k++) {
914 names2[k] = names2[k].replaceName(n, n2);
915 }
916 }
917 }
918
919 form = new LambdaForm(lambdaForm.debugName, arity2, names2, result2);
920 return putInCache(key, form);
921 }
922
923 LambdaForm noteLoopLocalTypesForm(int pos, BasicType[] localTypes) {
924 assert(lambdaForm.isLoop(pos));
925 int[] desc = BasicType.basicTypeOrds(localTypes);
926 desc = Arrays.copyOf(desc, desc.length + 1);
927 desc[desc.length - 1] = pos;
928 Transform key = Transform.of(Transform.LOCAL_TYPES, desc);
929 LambdaForm form = getInCache(key);
930 if (form != null) {
931 return form;
932 }
933
934 // replace the null entry in the MHImpl.loop invocation with localTypes
935 Name invokeLoop = lambdaForm.names[pos + 1];
936 assert(invokeLoop.function == NF_loop);
937 Object[] args = Arrays.copyOf(invokeLoop.arguments, invokeLoop.arguments.length);
938 assert(args[0] == null);
939 args[0] = localTypes;
940
941 LambdaFormBuffer buf = buffer();
942 buf.startEdit();
943 buf.changeName(pos + 1, new Name(NF_loop, args));
944 form = buf.endEdit();
945
946 return putInCache(key, form);
947 }
948
949 static boolean permutedTypesMatch(int[] reorder, BasicType[] types, Name[] names, int skip) {
950 for (int i = 0; i < reorder.length; i++) {
951 assert (names[skip + i].isParam());
952 assert (names[skip + i].type == types[reorder[i]]);
953 }
954 return true;
955 }
956 }