1 /*
2 * Copyright (c) 2015, 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
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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 /* @test
27 * @bug 8139885
28 * @bug 8150635
29 * @run testng/othervm -ea -esa test.java.lang.invoke.LoopCombinatorTest
30 */
31
32 package test.java.lang.invoke;
33
34 import java.lang.invoke.MethodHandle;
35 import java.lang.invoke.MethodHandles;
36 import java.lang.invoke.MethodHandles.Lookup;
37 import java.lang.invoke.MethodType;
38 import java.util.*;
39
40 import static java.lang.invoke.MethodType.methodType;
41
42 import static org.testng.AssertJUnit.*;
43
44 import org.testng.annotations.*;
45
46 /**
47 * Tests for the loop combinators introduced in JEP 274.
48 */
49 public class LoopCombinatorTest {
50
51 static final Lookup LOOKUP = MethodHandles.lookup();
52
53 @Test
54 public static void testLoopFac() throws Throwable {
55 MethodHandle[] counterClause = new MethodHandle[]{Fac.MH_zero, Fac.MH_inc};
56 MethodHandle[] accumulatorClause = new MethodHandle[]{Fac.MH_one, Fac.MH_mult, Fac.MH_pred, Fac.MH_fin};
57 MethodHandle loop = MethodHandles.loop(counterClause, accumulatorClause);
58 assertEquals(Fac.MT_fac, loop.type());
59 assertEquals(120, loop.invoke(5));
60 }
61
62 @Test
63 public static void testLoopFacNullInit() throws Throwable {
64 // null initializer for counter, should initialize to 0
65 MethodHandle[] counterClause = new MethodHandle[]{null, Fac.MH_inc};
66 MethodHandle[] accumulatorClause = new MethodHandle[]{Fac.MH_one, Fac.MH_mult, Fac.MH_pred, Fac.MH_fin};
67 MethodHandle loop = MethodHandles.loop(counterClause, accumulatorClause);
68 assertEquals(Fac.MT_fac, loop.type());
69 assertEquals(120, loop.invoke(5));
70 }
71
72 @Test
73 public static void testLoopNullInit() throws Throwable {
74 // null initializer for counter, should initialize to 0, one-clause loop
75 MethodHandle[] counterClause = new MethodHandle[]{null, Loop.MH_inc, Loop.MH_pred, Loop.MH_fin};
76 MethodHandle loop = MethodHandles.loop(counterClause);
77 assertEquals(Loop.MT_loop, loop.type());
78 assertEquals(10, loop.invoke(10));
79 }
80
81 @Test
82 public static void testLoopVoid1() throws Throwable {
83 // construct a post-checked loop that only does one iteration and has a void body and void local state
84 MethodHandle loop = MethodHandles.loop(new MethodHandle[]{Empty.MH_f, Empty.MH_f, Empty.MH_pred, null});
85 assertEquals(MethodType.methodType(void.class), loop.type());
86 loop.invoke();
87 }
88
89 @Test
90 public static void testLoopVoid2() throws Throwable {
91 // construct a post-checked loop that only does one iteration and has a void body and void local state,
92 // initialized implicitly from the step type
93 MethodHandle loop = MethodHandles.loop(new MethodHandle[]{null, Empty.MH_f, Empty.MH_pred, null});
94 assertEquals(MethodType.methodType(void.class), loop.type());
95 loop.invoke();
96 }
97
98 @Test
99 public static void testLoopVoid3() throws Throwable {
100 // construct a post-checked loop that only does one iteration and has a void body and void local state,
101 // and that has a void finalizer
102 MethodHandle loop = MethodHandles.loop(new MethodHandle[]{null, Empty.MH_f, Empty.MH_pred, Empty.MH_f});
103 assertEquals(MethodType.methodType(void.class), loop.type());
104 loop.invoke();
105 }
106
107 @Test
108 public static void testLoopFacWithVoidState() throws Throwable {
109 // like testLoopFac, but with additional void state that outputs a dot
110 MethodHandle[] counterClause = new MethodHandle[]{Fac.MH_zero, Fac.MH_inc};
111 MethodHandle[] accumulatorClause = new MethodHandle[]{Fac.MH_one, Fac.MH_mult, Fac.MH_pred, Fac.MH_fin};
112 MethodHandle[] dotClause = new MethodHandle[]{null, Fac.MH_dot};
113 MethodHandle loop = MethodHandles.loop(counterClause, accumulatorClause, dotClause);
114 assertEquals(Fac.MT_fac, loop.type());
115 assertEquals(120, loop.invoke(5));
116 }
117
118 @Test
119 public static void testLoopVoidInt() throws Throwable {
120 // construct a post-checked loop that only does one iteration and has a void body and void local state,
121 // and that returns a constant
122 MethodHandle loop = MethodHandles.loop(new MethodHandle[]{null, Empty.MH_f, Empty.MH_pred, Empty.MH_c});
123 assertEquals(MethodType.methodType(int.class), loop.type());
124 assertEquals(23, loop.invoke());
125 }
126
127 @Test
128 public static void testLoopWithVirtuals() throws Throwable {
129 // construct a loop (to calculate factorial) that uses a mix of static and virtual methods
130 MethodHandle[] counterClause = new MethodHandle[]{null, LoopWithVirtuals.permute(LoopWithVirtuals.MH_inc)};
131 MethodHandle[] accumulatorClause = new MethodHandle[]{
132 // init function must indicate the loop arguments (there is no other means to determine them)
133 MethodHandles.dropArguments(LoopWithVirtuals.MH_one, 0, LoopWithVirtuals.class),
134 LoopWithVirtuals.permute(LoopWithVirtuals.MH_mult),
135 LoopWithVirtuals.permute(LoopWithVirtuals.MH_pred),
136 LoopWithVirtuals.permute(LoopWithVirtuals.MH_fin)
137 };
138 MethodHandle loop = MethodHandles.loop(counterClause, accumulatorClause);
139 assertEquals(LoopWithVirtuals.MT_loop, loop.type());
140 assertEquals(120, loop.invoke(new LoopWithVirtuals(), 5));
141 }
142
143 @DataProvider
144 static Object[][] negativeTestData() {
145 MethodHandle i0 = MethodHandles.constant(int.class, 0);
146 MethodHandle ii = MethodHandles.dropArguments(i0, 0, int.class, int.class);
147 MethodHandle id = MethodHandles.dropArguments(i0, 0, int.class, double.class);
148 MethodHandle i3 = MethodHandles.dropArguments(i0, 0, int.class, int.class, int.class);
149 List<MethodHandle> inits = Arrays.asList(ii, id, i3);
150 List<Class<?>> ints = Arrays.asList(int.class, int.class, int.class);
151 List<MethodHandle> finis = Arrays.asList(Fac.MH_fin, Fac.MH_inc, Counted.MH_step);
152 List<MethodHandle> preds1 = Arrays.asList(null, null, null);
153 List<MethodHandle> preds2 = Arrays.asList(null, Fac.MH_fin, null);
154 MethodHandle eek = MethodHandles.dropArguments(i0, 0, int.class, int.class, double.class);
155 List<MethodHandle> nesteps = Arrays.asList(Fac.MH_inc, eek, Fac.MH_dot);
156 List<MethodHandle> nepreds = Arrays.asList(null, Fac.MH_pred, null);
157 List<MethodHandle> nefinis = Arrays.asList(null, Fac.MH_fin, null);
158 List<MethodHandle> lvsteps = Arrays.asList(LoopWithVirtuals.MH_inc, LoopWithVirtuals.MH_mult);
159 List<MethodHandle> lvpreds = Arrays.asList(null, LoopWithVirtuals.MH_pred);
160 List<MethodHandle> lvfinis = Arrays.asList(null, LoopWithVirtuals.MH_fin);
161 return new Object[][] {
162 {null, "null or no clauses passed"},
163 {new MethodHandle[][]{}, "null or no clauses passed"},
164 {new MethodHandle[][]{{null, Fac.MH_inc}, {Fac.MH_one, null, Fac.MH_mult, Fac.MH_pred, Fac.MH_fin}},
165 "All loop clauses must be represented as MethodHandle arrays with at most 4 elements."},
166 {new MethodHandle[][]{{null, Fac.MH_inc}, null}, "null clauses are not allowed"},
167 {new MethodHandle[][]{{Fac.MH_zero, Fac.MH_dot}},
168 "clause 0: init and step return types must match: int != void"},
169 {new MethodHandle[][]{{ii}, {id}, {i3}},
170 "found non-effectively identical init parameter type lists: " + inits +
171 " (common suffix: " + ints + ")"},
172 {new MethodHandle[][]{{null, Fac.MH_inc, null, Fac.MH_fin}, {null, Fac.MH_inc, null, Fac.MH_inc},
173 {null, Counted.MH_start, null, Counted.MH_step}},
174 "found non-identical finalizer return types: " + finis + " (return type: int)"},
175 {new MethodHandle[][]{{Fac.MH_zero, Fac.MH_inc}, {Fac.MH_one, Fac.MH_mult, null, Fac.MH_fin},
176 {null, Fac.MH_dot}}, "no predicate found: " + preds1},
177 {new MethodHandle[][]{{Fac.MH_zero, Fac.MH_inc}, {Fac.MH_one, Fac.MH_mult, Fac.MH_fin, Fac.MH_fin},
178 {null, Fac.MH_dot}}, "predicates must have boolean return type: " + preds2},
179 {new MethodHandle[][]{{Fac.MH_zero, Fac.MH_inc}, {Fac.MH_one, eek, Fac.MH_pred, Fac.MH_fin},
180 {null, Fac.MH_dot}},
181 "found non-effectively identical parameter type lists:\nstep: " + nesteps +
182 "\npred: " + nepreds + "\nfini: " + nefinis + " (common parameter sequence: " + ints + ")"},
183 {new MethodHandle[][]{{null, LoopWithVirtuals.MH_inc},
184 {LoopWithVirtuals.MH_one, LoopWithVirtuals.MH_mult, LoopWithVirtuals.MH_pred, LoopWithVirtuals.MH_fin}},
185 "found non-effectively identical parameter type lists:\nstep: " + lvsteps +
186 "\npred: " + lvpreds + "\nfini: " + lvfinis + " (common parameter sequence: " + ints + ")"}
187 };
188 }
189
190 static final MethodHandle MH_loop;
191
192 static {
193 try {
194 MH_loop = LOOKUP.findStatic(MethodHandles.class, "loop", methodType(MethodHandle.class, MethodHandle[][].class));
195 } catch (NoSuchMethodException | IllegalAccessException e) {
196 throw new ExceptionInInitializerError(e);
197 }
198 }
199
200 @Test(dataProvider = "negativeTestData")
201 public static void testLoopNegative(MethodHandle[][] clauses, String expectedMessage) throws Throwable {
202 boolean caught = false;
203 try {
204 MH_loop.invokeWithArguments(clauses);
205 } catch (IllegalArgumentException iae) {
206 assertEquals(expectedMessage, iae.getMessage());
207 caught = true;
208 }
209 assertTrue(caught);
210 }
211
212 @Test
213 public static void testWhileLoop() throws Throwable {
214 // int i = 0; while (i < limit) { ++i; } return i; => limit
215 MethodHandle loop = MethodHandles.whileLoop(While.MH_zero, While.MH_pred, While.MH_step);
216 assertEquals(While.MT_while, loop.type());
217 assertEquals(23, loop.invoke(23));
218 }
219
220 @Test
221 public static void testWhileLoopNoIteration() throws Throwable {
222 // a while loop that never executes its body because the predicate evaluates to false immediately
223 MethodHandle loop = MethodHandles.whileLoop(While.MH_initString, While.MH_predString, While.MH_stepString);
224 assertEquals(While.MT_string, loop.type());
225 assertEquals("a", loop.invoke());
226 }
227
228 @Test
229 public static void testDoWhileLoop() throws Throwable {
230 // int i = 0; do { ++i; } while (i < limit); return i; => limit
231 MethodHandle loop = MethodHandles.doWhileLoop(While.MH_zero, While.MH_step, While.MH_pred);
232 assertEquals(While.MT_while, loop.type());
233 assertEquals(23, loop.invoke(23));
234 }
235
236 @Test
237 public static void testDoWhileNullInit() throws Throwable {
238 While w = new While();
239 MethodHandle loop = MethodHandles.doWhileLoop(null, While.MH_voidBody.bindTo(w), While.MH_voidPred.bindTo(w));
240 assertEquals(While.MT_void, loop.type());
241 loop.invoke(5);
242 }
243
244 @Test
245 public static void testWhileZip() throws Throwable {
246 MethodHandle loop = MethodHandles.doWhileLoop(While.MH_zipInitZip, While.MH_zipStep, While.MH_zipPred);
247 assertEquals(While.MT_zip, loop.type());
248 List<String> a = Arrays.asList("a", "b", "c", "d");
249 List<String> b = Arrays.asList("e", "f", "g", "h");
250 List<String> zipped = Arrays.asList("a", "e", "b", "f", "c", "g", "d", "h");
251 assertEquals(zipped, (List<String>) loop.invoke(a.iterator(), b.iterator()));
252 }
253
254 @Test
255 public static void testWhileNullInit() throws Throwable {
256 While w = new While();
257 MethodHandle loop = MethodHandles.whileLoop(null, While.MH_voidPred.bindTo(w), While.MH_voidBody.bindTo(w));
258 assertEquals(While.MT_void, loop.type());
259 loop.invoke(5);
260 }
261
262 @Test
263 public static void testCountedLoop() throws Throwable {
264 // String s = "Lambdaman!"; for (int i = 0; i < 13; ++i) { s = "na " + s; } return s; => a variation on a well known theme
265 MethodHandle fit13 = MethodHandles.constant(int.class, 13);
266 MethodHandle loop = MethodHandles.countedLoop(fit13, Counted.MH_start, Counted.MH_step);
267 assertEquals(Counted.MT_counted, loop.type());
268 assertEquals("na na na na na na na na na na na na na Lambdaman!", loop.invoke("Lambdaman!"));
269 }
270
271 @Test
272 public static void testCountedArrayLoop() throws Throwable {
273 // int[] a = new int[]{0}; for (int i = 0; i < 13; ++i) { ++a[0]; } => a[0] == 13
274 MethodHandle fit13 = MethodHandles.dropArguments(MethodHandles.constant(int.class, 13), 0, int[].class);
275 MethodHandle loop = MethodHandles.countedLoop(fit13, null, Counted.MH_stepUpdateArray);
276 assertEquals(Counted.MT_arrayCounted, loop.type());
277 int[] a = new int[]{0};
278 loop.invoke(a);
279 assertEquals(13, a[0]);
280 }
281
282 @Test
283 public static void testCountedPrintingLoop() throws Throwable {
284 MethodHandle fit5 = MethodHandles.constant(int.class, 5);
285 MethodHandle loop = MethodHandles.countedLoop(fit5, null, Counted.MH_printHello);
286 assertEquals(Counted.MT_countedPrinting, loop.type());
287 loop.invoke();
288 }
289
290 @Test
291 public static void testCountedRangeLoop() throws Throwable {
292 // String s = "Lambdaman!"; for (int i = -5; i < 8; ++i) { s = "na " + s; } return s; => a well known theme
293 MethodHandle fitm5 = MethodHandles.dropArguments(Counted.MH_m5, 0, String.class);
294 MethodHandle fit8 = MethodHandles.dropArguments(Counted.MH_8, 0, String.class);
295 MethodHandle loop = MethodHandles.countedLoop(fitm5, fit8, Counted.MH_start, Counted.MH_step);
296 assertEquals(Counted.MT_counted, loop.type());
297 assertEquals("na na na na na na na na na na na na na Lambdaman!", loop.invoke("Lambdaman!"));
298 }
299
300 @Test
301 public static void testIterateSum() throws Throwable {
302 // Integer[] a = new Integer[]{1,2,3,4,5,6}; int sum = 0; for (int e : a) { sum += e; } return sum; => 21
303 MethodHandle loop = MethodHandles.iteratedLoop(Iterate.MH_sumIterator, Iterate.MH_sumInit, Iterate.MH_sumStep);
304 assertEquals(Iterate.MT_sum, loop.type());
305 assertEquals(21, loop.invoke(new Integer[]{1, 2, 3, 4, 5, 6}));
306 }
307
308 @Test
309 public static void testIterateReverse() throws Throwable {
310 MethodHandle loop = MethodHandles.iteratedLoop(null, Iterate.MH_reverseInit, Iterate.MH_reverseStep);
311 assertEquals(Iterate.MT_reverse, loop.type());
312 List<String> list = Arrays.asList("a", "b", "c", "d", "e");
313 List<String> reversedList = Arrays.asList("e", "d", "c", "b", "a");
314 assertEquals(reversedList, (List<String>) loop.invoke(list));
315 }
316
317 @Test
318 public static void testIterateLength() throws Throwable {
319 MethodHandle loop = MethodHandles.iteratedLoop(null, Iterate.MH_lengthInit, Iterate.MH_lengthStep);
320 assertEquals(Iterate.MT_length, loop.type());
321 List<Double> list = Arrays.asList(23.0, 148.0, 42.0);
322 assertEquals(list.size(), (int) loop.invoke(list));
323 }
324
325 @Test
326 public static void testIterateMap() throws Throwable {
327 MethodHandle loop = MethodHandles.iteratedLoop(null, Iterate.MH_mapInit, Iterate.MH_mapStep);
328 assertEquals(Iterate.MT_map, loop.type());
329 List<String> list = Arrays.asList("Hello", "world", "!");
330 List<String> upList = Arrays.asList("HELLO", "WORLD", "!");
331 assertEquals(upList, (List<String>) loop.invoke(list));
332 }
333
334 @Test
335 public static void testIteratePrint() throws Throwable {
336 MethodHandle loop = MethodHandles.iteratedLoop(null, null, Iterate.MH_printStep);
337 assertEquals(Iterate.MT_print, loop.type());
338 loop.invoke(Arrays.asList("hello", "world"));
339 }
340
341 @Test
342 public static void testIterateNullBody() {
343 boolean caught = false;
344 try {
345 MethodHandles.iteratedLoop(MethodHandles.identity(int.class), MethodHandles.identity(int.class), null);
346 } catch (IllegalArgumentException iae) {
347 assertEquals("iterated loop body must not be null", iae.getMessage());
348 caught = true;
349 }
350 assertTrue(caught);
351 }
352
353 static class Empty {
354
355 static void f() { }
356
357 static boolean pred() {
358 return false;
359 }
360
361 static int c() {
362 return 23;
363 }
364
365 static final Class<Empty> EMPTY = Empty.class;
366
367 static final MethodType MT_f = methodType(void.class);
368 static final MethodType MT_pred = methodType(boolean.class);
369 static final MethodType MT_c = methodType(int.class);
370
371 static final MethodHandle MH_f;
372 static final MethodHandle MH_pred;
373 static final MethodHandle MH_c;
374
375 static {
376 try {
377 MH_f = LOOKUP.findStatic(EMPTY, "f", MT_f);
378 MH_pred = LOOKUP.findStatic(EMPTY, "pred", MT_pred);
379 MH_c = LOOKUP.findStatic(EMPTY, "c", MT_c);
380 } catch (Exception e) {
381 throw new ExceptionInInitializerError(e);
382 }
383 }
384 }
385
386 static class Fac {
387
388 static int zero(int k) {
389 return 0;
390 }
391
392 static int one(int k) {
393 return 1;
394 }
395
396 static boolean pred(int i, int acc, int k) {
397 return i < k;
398 }
399
400 static int inc(int i, int acc, int k) {
401 return i + 1;
402 }
403
404 static int mult(int i, int acc, int k) {
405 return i * acc;
406 }
407
408 static void dot(int i, int acc, int k) {
409 System.out.print('.');
410 }
411
412 static int fin(int i, int acc, int k) {
413 return acc;
414 }
415
416 static final Class<Fac> FAC = Fac.class;
417
418 static final MethodType MT_init = methodType(int.class, int.class);
419 static final MethodType MT_fn = methodType(int.class, int.class, int.class, int.class);
420 static final MethodType MT_dot = methodType(void.class, int.class, int.class, int.class);
421 static final MethodType MT_pred = methodType(boolean.class, int.class, int.class, int.class);
422
423 static final MethodHandle MH_zero;
424 static final MethodHandle MH_one;
425 static final MethodHandle MH_pred;
426 static final MethodHandle MH_inc;
427 static final MethodHandle MH_mult;
428 static final MethodHandle MH_dot;
429 static final MethodHandle MH_fin;
430
431 static final MethodType MT_fac = methodType(int.class, int.class);
432
433 static {
434 try {
435 MH_zero = LOOKUP.findStatic(FAC, "zero", MT_init);
436 MH_one = LOOKUP.findStatic(FAC, "one", MT_init);
437 MH_pred = LOOKUP.findStatic(FAC, "pred", MT_pred);
438 MH_inc = LOOKUP.findStatic(FAC, "inc", MT_fn);
439 MH_mult = LOOKUP.findStatic(FAC, "mult", MT_fn);
440 MH_dot = LOOKUP.findStatic(FAC, "dot", MT_dot);
441 MH_fin = LOOKUP.findStatic(FAC, "fin", MT_fn);
442 } catch (Exception e) {
443 throw new ExceptionInInitializerError(e);
444 }
445 }
446
447 }
448
449 static class Loop {
450
451 static int inc(int i, int k) {
452 return i + 1;
453 }
454
455 static boolean pred(int i, int k) {
456 return i < k;
457 }
458
459 static int fin(int i, int k) {
460 return k;
461 }
462
463 static final Class<Loop> LOOP = Loop.class;
464
465 static final MethodType MT_inc = methodType(int.class, int.class, int.class);
466 static final MethodType MT_pred = methodType(boolean.class, int.class, int.class);
467 static final MethodType MT_fin = methodType(int.class, int.class, int.class);
468
469 static final MethodHandle MH_inc;
470 static final MethodHandle MH_pred;
471 static final MethodHandle MH_fin;
472
473 static final MethodType MT_loop = methodType(int.class, int.class);
474
475 static {
476 try {
477 MH_inc = LOOKUP.findStatic(LOOP, "inc", MT_inc);
478 MH_pred = LOOKUP.findStatic(LOOP, "pred", MT_pred);
479 MH_fin = LOOKUP.findStatic(LOOP, "fin", MT_fin);
480 } catch (Exception e) {
481 throw new ExceptionInInitializerError(e);
482 }
483 }
484
485 }
486
487 static class LoopWithVirtuals {
488
489 static int one(int k) {
490 return 1;
491 }
492
493 int inc(int i, int acc, int k) {
494 return i + 1;
495 }
496
497 int mult(int i, int acc, int k) {
498 return i * acc;
499 }
500
501 boolean pred(int i, int acc, int k) {
502 return i < k;
503 }
504
505 int fin(int i, int acc, int k) {
506 return acc;
507 }
508
509 static final Class<LoopWithVirtuals> LOOP_WITH_VIRTUALS = LoopWithVirtuals.class;
510
511 static final MethodType MT_one = methodType(int.class, int.class);
512 static final MethodType MT_inc = methodType(int.class, int.class, int.class, int.class);
513 static final MethodType MT_mult = methodType(int.class, int.class, int.class, int.class);
514 static final MethodType MT_pred = methodType(boolean.class, int.class, int.class, int.class);
515 static final MethodType MT_fin = methodType(int.class, int.class, int.class, int.class);
516
517 static final MethodHandle MH_one;
518 static final MethodHandle MH_inc;
519 static final MethodHandle MH_mult;
520 static final MethodHandle MH_pred;
521 static final MethodHandle MH_fin;
522
523 static final MethodType MT_loop = methodType(int.class, LOOP_WITH_VIRTUALS, int.class);
524
525 static {
526 try {
527 MH_one = LOOKUP.findStatic(LOOP_WITH_VIRTUALS, "one", MT_one);
528 MH_inc = LOOKUP.findVirtual(LOOP_WITH_VIRTUALS, "inc", MT_inc);
529 MH_mult = LOOKUP.findVirtual(LOOP_WITH_VIRTUALS, "mult", MT_mult);
530 MH_pred = LOOKUP.findVirtual(LOOP_WITH_VIRTUALS, "pred", MT_pred);
531 MH_fin = LOOKUP.findVirtual(LOOP_WITH_VIRTUALS, "fin", MT_fin);
532 } catch (Exception e) {
533 throw new ExceptionInInitializerError(e);
534 }
535 }
536
537 static MethodHandle permute(MethodHandle h) {
538 // The handles representing virtual methods need to be rearranged to match the required order of arguments
539 // (loop-local state comes first, then loop arguments). As the receiver comes first in the signature but is
540 // a loop argument, it must be moved to the appropriate position in the signature.
541 return MethodHandles.permuteArguments(h,
542 methodType(h.type().returnType(), int.class, int.class, LOOP_WITH_VIRTUALS, int.class), 2, 0, 1, 3);
543 }
544
545 }
546
547 static class While {
548
549 static int zero(int limit) {
550 return 0;
551 }
552
553 static boolean pred(int i, int limit) {
554 return i < limit;
555 }
556
557 static int step(int i, int limit) {
558 return i + 1;
559 }
560
561 static String initString() {
562 return "a";
563 }
564
565 static boolean predString(String s) {
566 return s.length() != 1;
567 }
568
569 static String stepString(String s) {
570 return s + "a";
571 }
572
573 static List<String> zipInitZip(Iterator<String> a, Iterator<String> b) {
574 return new ArrayList<>();
575 }
576
577 static boolean zipPred(List<String> zip, Iterator<String> a, Iterator<String> b) {
578 return a.hasNext() && b.hasNext();
579 }
580
581 static List<String> zipStep(List<String> zip, Iterator<String> a, Iterator<String> b) {
582 zip.add(a.next());
583 zip.add(b.next());
584 return zip;
585 }
586
587 private int i = 0;
588
589 void voidBody(int k) {
590 ++i;
591 }
592
593 boolean voidPred(int k) {
594 return i < k;
595 }
596
597 static final Class<While> WHILE = While.class;
598
599 static final MethodType MT_zero = methodType(int.class, int.class);
600 static final MethodType MT_pred = methodType(boolean.class, int.class, int.class);
601 static final MethodType MT_fn = methodType(int.class, int.class, int.class);
602 static final MethodType MT_initString = methodType(String.class);
603 static final MethodType MT_predString = methodType(boolean.class, String.class);
604 static final MethodType MT_stepString = methodType(String.class, String.class);
605 static final MethodType MT_zipInitZip = methodType(List.class, Iterator.class, Iterator.class);
606 static final MethodType MT_zipPred = methodType(boolean.class, List.class, Iterator.class, Iterator.class);
607 static final MethodType MT_zipStep = methodType(List.class, List.class, Iterator.class, Iterator.class);
608 static final MethodType MT_voidBody = methodType(void.class, int.class);
609 static final MethodType MT_voidPred = methodType(boolean.class, int.class);
610
611 static final MethodHandle MH_zero;
612 static final MethodHandle MH_pred;
613 static final MethodHandle MH_step;
614 static final MethodHandle MH_initString;
615 static final MethodHandle MH_predString;
616 static final MethodHandle MH_stepString;
617 static final MethodHandle MH_zipInitZip;
618 static final MethodHandle MH_zipPred;
619 static final MethodHandle MH_zipStep;
620 static final MethodHandle MH_voidBody;
621 static final MethodHandle MH_voidPred;
622
623 static final MethodType MT_while = methodType(int.class, int.class);
624 static final MethodType MT_string = methodType(String.class);
625 static final MethodType MT_zip = methodType(List.class, Iterator.class, Iterator.class);
626 static final MethodType MT_void = methodType(void.class, int.class);
627
628 static {
629 try {
630 MH_zero = LOOKUP.findStatic(WHILE, "zero", MT_zero);
631 MH_pred = LOOKUP.findStatic(WHILE, "pred", MT_pred);
632 MH_step = LOOKUP.findStatic(WHILE, "step", MT_fn);
633 MH_initString = LOOKUP.findStatic(WHILE, "initString", MT_initString);
634 MH_predString = LOOKUP.findStatic(WHILE, "predString", MT_predString);
635 MH_stepString = LOOKUP.findStatic(WHILE, "stepString", MT_stepString);
636 MH_zipInitZip = LOOKUP.findStatic(WHILE, "zipInitZip", MT_zipInitZip);
637 MH_zipPred = LOOKUP.findStatic(WHILE, "zipPred", MT_zipPred);
638 MH_zipStep = LOOKUP.findStatic(WHILE, "zipStep", MT_zipStep);
639 MH_voidBody = LOOKUP.findVirtual(WHILE, "voidBody", MT_voidBody);
640 MH_voidPred = LOOKUP.findVirtual(WHILE, "voidPred", MT_voidPred);
641 } catch (Exception e) {
642 throw new ExceptionInInitializerError(e);
643 }
644 }
645
646 }
647
648 static class Counted {
649
650 static String start(String arg) {
651 return arg;
652 }
653
654 static String step(int counter, String v, String arg) {
655 return "na " + v;
656 }
657
658 static void stepUpdateArray(int counter, int[] a) {
659 ++a[0];
660 }
661
662 static void printHello(int counter) {
663 System.out.print("hello");
664 }
665
666 static final Class<Counted> COUNTED = Counted.class;
667
668 static final MethodType MT_start = methodType(String.class, String.class);
669 static final MethodType MT_step = methodType(String.class, int.class, String.class, String.class);
670 static final MethodType MT_stepUpdateArray = methodType(void.class, int.class, int[].class);
671 static final MethodType MT_printHello = methodType(void.class, int.class);
672
673 static final MethodHandle MH_13;
674 static final MethodHandle MH_m5;
675 static final MethodHandle MH_8;
676 static final MethodHandle MH_start;
677 static final MethodHandle MH_step;
678 static final MethodHandle MH_stepUpdateArray;
679 static final MethodHandle MH_printHello;
680
681 static final MethodType MT_counted = methodType(String.class, String.class);
682 static final MethodType MT_arrayCounted = methodType(void.class, int[].class);
683 static final MethodType MT_countedPrinting = methodType(void.class);
684
685 static {
686 try {
687 MH_13 = MethodHandles.constant(int.class, 13);
688 MH_m5 = MethodHandles.constant(int.class, -5);
689 MH_8 = MethodHandles.constant(int.class, 8);
690 MH_start = LOOKUP.findStatic(COUNTED, "start", MT_start);
691 MH_step = LOOKUP.findStatic(COUNTED, "step", MT_step);
692 MH_stepUpdateArray = LOOKUP.findStatic(COUNTED, "stepUpdateArray", MT_stepUpdateArray);
693 MH_printHello = LOOKUP.findStatic(COUNTED, "printHello", MT_printHello);
694 } catch (Exception e) {
695 throw new ExceptionInInitializerError(e);
696 }
697 }
698
699 }
700
701 static class Iterate {
702
703 static Iterator<Integer> sumIterator(Integer[] a) {
704 return Arrays.asList(a).iterator();
705 }
706
707 static int sumInit(Integer[] a) {
708 return 0;
709 }
710
711 static int sumStep(int s, int e, Integer[] a) {
712 return s + e;
713 }
714
715 static List<String> reverseInit(List<String> l) {
716 return new ArrayList<>();
717 }
718
719 static List<String> reverseStep(String e, List<String> r, List<String> l) {
720 r.add(0, e);
721 return r;
722 }
723
724 static int lengthInit(List<Double> l) {
725 return 0;
726 }
727
728 static int lengthStep(Object o, int len, List<Double> l) {
729 return len + 1;
730 }
731
732 static List<String> mapInit(List<String> l) {
733 return new ArrayList<>();
734 }
735
736 static List<String> mapStep(String e, List<String> r, List<String> l) {
737 r.add(e.toUpperCase());
738 return r;
739 }
740
741 static void printStep(String s, List<String> l) {
742 System.out.print(s);
743 }
744
745 static final Class<Iterate> ITERATE = Iterate.class;
746
747 static final MethodType MT_sumIterator = methodType(Iterator.class, Integer[].class);
748
749 static final MethodType MT_sumInit = methodType(int.class, Integer[].class);
750 static final MethodType MT_reverseInit = methodType(List.class, List.class);
751 static final MethodType MT_lenghInit = methodType(int.class, List.class);
752 static final MethodType MT_mapInit = methodType(List.class, List.class);
753
754 static final MethodType MT_sumStep = methodType(int.class, int.class, int.class, Integer[].class);
755 static final MethodType MT_reverseStep = methodType(List.class, String.class, List.class, List.class);
756 static final MethodType MT_lengthStep = methodType(int.class, Object.class, int.class, List.class);
757 static final MethodType MT_mapStep = methodType(List.class, String.class, List.class, List.class);
758 static final MethodType MT_printStep = methodType(void.class, String.class, List.class);
759
760 static final MethodHandle MH_sumIterator;
761 static final MethodHandle MH_sumInit;
762 static final MethodHandle MH_sumStep;
763 static final MethodHandle MH_printStep;
764
765 static final MethodHandle MH_reverseInit;
766 static final MethodHandle MH_reverseStep;
767
768 static final MethodHandle MH_lengthInit;
769 static final MethodHandle MH_lengthStep;
770
771 static final MethodHandle MH_mapInit;
772 static final MethodHandle MH_mapStep;
773
774 static final MethodType MT_sum = methodType(int.class, Integer[].class);
775 static final MethodType MT_reverse = methodType(List.class, List.class);
776 static final MethodType MT_length = methodType(int.class, List.class);
777 static final MethodType MT_map = methodType(List.class, List.class);
778 static final MethodType MT_print = methodType(void.class, List.class);
779
780 static {
781 try {
782 MH_sumIterator = LOOKUP.findStatic(ITERATE, "sumIterator", MT_sumIterator);
783 MH_sumInit = LOOKUP.findStatic(ITERATE, "sumInit", MT_sumInit);
784 MH_sumStep = LOOKUP.findStatic(ITERATE, "sumStep", MT_sumStep);
785 MH_reverseInit = LOOKUP.findStatic(ITERATE, "reverseInit", MT_reverseInit);
786 MH_reverseStep = LOOKUP.findStatic(ITERATE, "reverseStep", MT_reverseStep);
787 MH_lengthInit = LOOKUP.findStatic(ITERATE, "lengthInit", MT_lenghInit);
788 MH_lengthStep = LOOKUP.findStatic(ITERATE, "lengthStep", MT_lengthStep);
789 MH_mapInit = LOOKUP.findStatic(ITERATE, "mapInit", MT_mapInit);
790 MH_mapStep = LOOKUP.findStatic(ITERATE, "mapStep", MT_mapStep);
791 MH_printStep = LOOKUP.findStatic(ITERATE, "printStep", MT_printStep);
792 } catch (Exception e) {
793 throw new ExceptionInInitializerError(e);
794 }
795 }
796
797 }
798
799 }