--- /dev/null 2016-03-02 13:44:00.000000000 +0100 +++ new/test/java/lang/invoke/LoopTest.java 2016-03-02 13:44:00.000000000 +0100 @@ -0,0 +1,766 @@ +/* + * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/* @test + * @bug 8139885 + * @bug 8150635 + * @run testng/othervm -ea -esa test.java.lang.invoke.LoopTest + */ + +package test.java.lang.invoke; + +import java.lang.invoke.MethodHandle; +import java.lang.invoke.MethodHandles; +import java.lang.invoke.MethodHandles.Lookup; +import java.lang.invoke.MethodType; +import java.util.*; + +import static java.lang.invoke.MethodType.methodType; + +import static org.testng.AssertJUnit.*; + +import org.testng.annotations.*; + +/** + * Tests for the loop combinators introduced in JEP 274. + */ +public class LoopTest { + + static final Lookup LOOKUP = MethodHandles.lookup(); + + @Test + public static void testLoopFac() throws Throwable { + MethodHandle[] counterClause = new MethodHandle[]{Fac.MH_zero, Fac.MH_inc}; + MethodHandle[] accumulatorClause = new MethodHandle[]{Fac.MH_one, Fac.MH_mult, Fac.MH_pred, Fac.MH_fin}; + MethodHandle loop = MethodHandles.loop(counterClause, accumulatorClause); + assertEquals(Fac.MT_fac, loop.type()); + assertEquals(120, loop.invoke(5)); + } + + @Test + public static void testLoopFacNullInit() throws Throwable { + // null initializer for counter, should initialize to 0 + MethodHandle[] counterClause = new MethodHandle[]{null, Fac.MH_inc}; + MethodHandle[] accumulatorClause = new MethodHandle[]{Fac.MH_one, Fac.MH_mult, Fac.MH_pred, Fac.MH_fin}; + MethodHandle loop = MethodHandles.loop(counterClause, accumulatorClause); + assertEquals(Fac.MT_fac, loop.type()); + assertEquals(120, loop.invoke(5)); + } + + @Test + public static void testLoopNullInit() throws Throwable { + // null initializer for counter, should initialize to 0, one-clause loop + MethodHandle[] counterClause = new MethodHandle[]{null, Loop.MH_inc, Loop.MH_pred, Loop.MH_fin}; + MethodHandle loop = MethodHandles.loop(counterClause); + assertEquals(Loop.MT_loop, loop.type()); + assertEquals(10, loop.invoke(10)); + } + + @Test + public static void testLoopVoid1() throws Throwable { + // construct a post-checked loop that only does one iteration and has a void body and void local state + MethodHandle loop = MethodHandles.loop(new MethodHandle[]{Empty.MH_f, Empty.MH_f, Empty.MH_pred, null}); + assertEquals(MethodType.methodType(void.class), loop.type()); + loop.invoke(); + } + + @Test + public static void testLoopVoid2() throws Throwable { + // construct a post-checked loop that only does one iteration and has a void body and void local state, + // initialized implicitly from the step type + MethodHandle loop = MethodHandles.loop(new MethodHandle[]{null, Empty.MH_f, Empty.MH_pred, null}); + assertEquals(MethodType.methodType(void.class), loop.type()); + loop.invoke(); + } + + @Test + public static void testLoopVoid3() throws Throwable { + // construct a post-checked loop that only does one iteration and has a void body and void local state, + // and that has a void finalizer + MethodHandle loop = MethodHandles.loop(new MethodHandle[]{null, Empty.MH_f, Empty.MH_pred, Empty.MH_f}); + assertEquals(MethodType.methodType(void.class), loop.type()); + loop.invoke(); + } + + @Test + public static void testLoopFacWithVoidState() throws Throwable { + // like testLoopFac, but with additional void state that outputs a dot + MethodHandle[] counterClause = new MethodHandle[]{Fac.MH_zero, Fac.MH_inc}; + MethodHandle[] accumulatorClause = new MethodHandle[]{Fac.MH_one, Fac.MH_mult, Fac.MH_pred, Fac.MH_fin}; + MethodHandle[] dotClause = new MethodHandle[]{null, Fac.MH_dot}; + MethodHandle loop = MethodHandles.loop(counterClause, accumulatorClause, dotClause); + assertEquals(Fac.MT_fac, loop.type()); + assertEquals(120, loop.invoke(5)); + } + + @Test + public static void testLoopVoidInt() throws Throwable { + // construct a post-checked loop that only does one iteration and has a void body and void local state, + // and that returns a constant + MethodHandle loop = MethodHandles.loop(new MethodHandle[]{null, Empty.MH_f, Empty.MH_pred, Empty.MH_c}); + assertEquals(MethodType.methodType(int.class), loop.type()); + assertEquals(23, loop.invoke()); + } + + @Test + public static void testLoopWithVirtuals() throws Throwable { + // construct a loop (to calculate factorial) that uses a mix of static and virtual methods + MethodHandle[] counterClause = new MethodHandle[]{null, LoopWithVirtuals.permute(LoopWithVirtuals.MH_inc)}; + MethodHandle[] accumulatorClause = new MethodHandle[]{ + // init function must indicate the loop arguments (there is no other means to determine them) + MethodHandles.dropArguments(LoopWithVirtuals.MH_one, 0, LoopWithVirtuals.class), + LoopWithVirtuals.permute(LoopWithVirtuals.MH_mult), + LoopWithVirtuals.permute(LoopWithVirtuals.MH_pred), + LoopWithVirtuals.permute(LoopWithVirtuals.MH_fin) + }; + MethodHandle loop = MethodHandles.loop(counterClause, accumulatorClause); + assertEquals(LoopWithVirtuals.MT_loop, loop.type()); + assertEquals(120, loop.invoke(new LoopWithVirtuals(), 5)); + } + + @DataProvider + static Object[][] negativeTestData() { + MethodHandle i0 = MethodHandles.constant(int.class, 0); + MethodHandle ii = MethodHandles.dropArguments(i0, 0, int.class, int.class); + MethodHandle id = MethodHandles.dropArguments(i0, 0, int.class, double.class); + MethodHandle i3 = MethodHandles.dropArguments(i0, 0, int.class, int.class, int.class); + List inits = Arrays.asList(ii, id, i3); + List> ints = Arrays.asList(int.class, int.class, int.class); + List finis = Arrays.asList(Fac.MH_fin, Fac.MH_inc, Counted.MH_step); + List preds1 = Arrays.asList(null, null, null); + List preds2 = Arrays.asList(null, Fac.MH_fin, null); + MethodHandle eek = MethodHandles.dropArguments(i0, 0, int.class, int.class, double.class); + List nesteps = Arrays.asList(Fac.MH_inc, eek, Fac.MH_dot); + List nepreds = Arrays.asList(null, Fac.MH_pred, null); + List nefinis = Arrays.asList(null, Fac.MH_fin, null); + List lvsteps = Arrays.asList(LoopWithVirtuals.MH_inc, LoopWithVirtuals.MH_mult); + List lvpreds = Arrays.asList(null, LoopWithVirtuals.MH_pred); + List lvfinis = Arrays.asList(null, LoopWithVirtuals.MH_fin); + return new Object[][] { + {null, "null or no clauses passed"}, + {new MethodHandle[][]{}, "null or no clauses passed"}, + {new MethodHandle[][]{{null, Fac.MH_inc}, {Fac.MH_one, null, Fac.MH_mult, Fac.MH_pred, Fac.MH_fin}}, + "All loop clauses must be represented as MethodHandle arrays with at most 4 elements."}, + {new MethodHandle[][]{{null, Fac.MH_inc}, null}, "null clauses are not allowed"}, + {new MethodHandle[][]{{Fac.MH_zero, Fac.MH_dot}}, + "clause 0: init and step return types must match: int != void"}, + {new MethodHandle[][]{{ii}, {id}, {i3}}, + "found non-effectively identical init parameter type lists: " + inits + + " (common suffix: " + ints + ")"}, + {new MethodHandle[][]{{null, Fac.MH_inc, null, Fac.MH_fin}, {null, Fac.MH_inc, null, Fac.MH_inc}, + {null, Counted.MH_start, null, Counted.MH_step}}, + "found non-identical finalizer return types: " + finis + " (return type: int)"}, + {new MethodHandle[][]{{Fac.MH_zero, Fac.MH_inc}, {Fac.MH_one, Fac.MH_mult, null, Fac.MH_fin}, + {null, Fac.MH_dot}}, "no predicate found: " + preds1}, + {new MethodHandle[][]{{Fac.MH_zero, Fac.MH_inc}, {Fac.MH_one, Fac.MH_mult, Fac.MH_fin, Fac.MH_fin}, + {null, Fac.MH_dot}}, "predicates must have boolean return type: " + preds2}, + {new MethodHandle[][]{{Fac.MH_zero, Fac.MH_inc}, {Fac.MH_one, eek, Fac.MH_pred, Fac.MH_fin}, + {null, Fac.MH_dot}}, + "found non-effectively identical parameter type lists:\nstep: " + nesteps + + "\npred: " + nepreds + "\nfini: " + nefinis + " (common parameter sequence: " + ints + ")"}, + {new MethodHandle[][]{{null, LoopWithVirtuals.MH_inc}, + {LoopWithVirtuals.MH_one, LoopWithVirtuals.MH_mult, LoopWithVirtuals.MH_pred, LoopWithVirtuals.MH_fin}}, + "found non-effectively identical parameter type lists:\nstep: " + lvsteps + + "\npred: " + lvpreds + "\nfini: " + lvfinis + " (common parameter sequence: " + ints + ")"} + }; + } + + static final MethodHandle MH_loop; + + static { + try { + MH_loop = LOOKUP.findStatic(MethodHandles.class, "loop", methodType(MethodHandle.class, MethodHandle[][].class)); + } catch (NoSuchMethodException | IllegalAccessException e) { + throw new ExceptionInInitializerError(e); + } + } + + @Test(dataProvider = "negativeTestData") + public static void testLoopNegative(MethodHandle[][] clauses, String expectedMessage) throws Throwable { + boolean caught = false; + try { + MH_loop.invokeWithArguments(clauses); + } catch (IllegalArgumentException iae) { + assertEquals(expectedMessage, iae.getMessage()); + caught = true; + } + assertTrue(caught); + } + + @Test + public static void testWhileLoop() throws Throwable { + // int i = 0; while (i < limit) { ++i; } return i; => limit + MethodHandle loop = MethodHandles.whileLoop(While.MH_zero, While.MH_pred, While.MH_step); + assertEquals(While.MT_while, loop.type()); + assertEquals(23, loop.invoke(23)); + } + + @Test + public static void testWhileLoopNoIteration() throws Throwable { + // a while loop that never executes its body because the predicate evaluates to false immediately + MethodHandle loop = MethodHandles.whileLoop(While.MH_initString, While.MH_predString, While.MH_stepString); + assertEquals(While.MT_string, loop.type()); + assertEquals("a", loop.invoke()); + } + + @Test + public static void testDoWhileLoop() throws Throwable { + // int i = 0; do { ++i; } while (i < limit); return i; => limit + MethodHandle loop = MethodHandles.doWhileLoop(While.MH_zero, While.MH_step, While.MH_pred); + assertEquals(While.MT_while, loop.type()); + assertEquals(23, loop.invoke(23)); + } + + @Test + public static void testWhileZip() throws Throwable { + MethodHandle loop = MethodHandles.doWhileLoop(While.MH_zipInitZip, While.MH_zipStep, While.MH_zipPred); + assertEquals(While.MT_zip, loop.type()); + List a = Arrays.asList("a", "b", "c", "d"); + List b = Arrays.asList("e", "f", "g", "h"); + List zipped = Arrays.asList("a", "e", "b", "f", "c", "g", "d", "h"); + assertEquals(zipped, (List) loop.invoke(a.iterator(), b.iterator())); + } + + @Test + public static void testCountedLoop() throws Throwable { + // String s = "Lambdaman!"; for (int i = 0; i < 13; ++i) { s = "na " + s; } return s; => a variation on a well known theme + MethodHandle fit13 = MethodHandles.constant(int.class, 13); + MethodHandle loop = MethodHandles.countedLoop(fit13, Counted.MH_start, Counted.MH_step); + assertEquals(Counted.MT_counted, loop.type()); + assertEquals("na na na na na na na na na na na na na Lambdaman!", loop.invoke("Lambdaman!")); + } + + @Test + public static void testCountedArrayLoop() throws Throwable { + // int[] a = new int[]{0}; for (int i = 0; i < 13; ++i) { ++a[0]; } => a[0] == 13 + MethodHandle fit13 = MethodHandles.dropArguments(MethodHandles.constant(int.class, 13), 0, int[].class); + MethodHandle loop = MethodHandles.countedLoop(fit13, null, Counted.MH_stepUpdateArray); + assertEquals(Counted.MT_arrayCounted, loop.type()); + int[] a = new int[]{0}; + loop.invoke(a); + assertEquals(13, a[0]); + } + + @Test + public static void testCountedPrintingLoop() throws Throwable { + MethodHandle fit5 = MethodHandles.constant(int.class, 5); + MethodHandle loop = MethodHandles.countedLoop(fit5, null, Counted.MH_printHello); + assertEquals(Counted.MT_countedPrinting, loop.type()); + loop.invoke(); + } + + @Test + public static void testCountedRangeLoop() throws Throwable { + // String s = "Lambdaman!"; for (int i = -5; i < 8; ++i) { s = "na " + s; } return s; => a well known theme + MethodHandle fitm5 = MethodHandles.dropArguments(Counted.MH_m5, 0, String.class); + MethodHandle fit8 = MethodHandles.dropArguments(Counted.MH_8, 0, String.class); + MethodHandle loop = MethodHandles.countedLoop(fitm5, fit8, Counted.MH_start, Counted.MH_step); + assertEquals(Counted.MT_counted, loop.type()); + assertEquals("na na na na na na na na na na na na na Lambdaman!", loop.invoke("Lambdaman!")); + } + + @Test + public static void testIterateSum() throws Throwable { + // Integer[] a = new Integer[]{1,2,3,4,5,6}; int sum = 0; for (int e : a) { sum += e; } return sum; => 21 + MethodHandle loop = MethodHandles.iteratedLoop(Iterate.MH_sumIterator, Iterate.MH_sumInit, Iterate.MH_sumStep); + assertEquals(Iterate.MT_sum, loop.type()); + assertEquals(21, loop.invoke(new Integer[]{1, 2, 3, 4, 5, 6})); + } + + @Test + public static void testIterateReverse() throws Throwable { + MethodHandle loop = MethodHandles.iteratedLoop(null, Iterate.MH_reverseInit, Iterate.MH_reverseStep); + assertEquals(Iterate.MT_reverse, loop.type()); + List list = Arrays.asList("a", "b", "c", "d", "e"); + List reversedList = Arrays.asList("e", "d", "c", "b", "a"); + assertEquals(reversedList, (List) loop.invoke(list)); + } + + @Test + public static void testIterateLength() throws Throwable { + MethodHandle loop = MethodHandles.iteratedLoop(null, Iterate.MH_lengthInit, Iterate.MH_lengthStep); + assertEquals(Iterate.MT_length, loop.type()); + List list = Arrays.asList(23.0, 148.0, 42.0); + assertEquals(list.size(), (int) loop.invoke(list)); + } + + @Test + public static void testIterateMap() throws Throwable { + MethodHandle loop = MethodHandles.iteratedLoop(null, Iterate.MH_mapInit, Iterate.MH_mapStep); + assertEquals(Iterate.MT_map, loop.type()); + List list = Arrays.asList("Hello", "world", "!"); + List upList = Arrays.asList("HELLO", "WORLD", "!"); + assertEquals(upList, (List) loop.invoke(list)); + } + + @Test + public static void testIteratePrint() throws Throwable { + MethodHandle loop = MethodHandles.iteratedLoop(null, null, Iterate.MH_printStep); + assertEquals(Iterate.MT_print, loop.type()); + loop.invoke(Arrays.asList("hello", "world")); + } + + @Test + public static void testIterateNullBody() { + boolean caught = false; + try { + MethodHandles.iteratedLoop(MethodHandles.identity(int.class), MethodHandles.identity(int.class), null); + } catch (IllegalArgumentException iae) { + assertEquals("iterated loop body must not be null", iae.getMessage()); + caught = true; + } + assertTrue(caught); + } + + static class Empty { + + static void f() { } + + static boolean pred() { + return false; + } + + static int c() { + return 23; + } + + static final Class EMPTY = Empty.class; + + static final MethodType MT_f = methodType(void.class); + static final MethodType MT_pred = methodType(boolean.class); + static final MethodType MT_c = methodType(int.class); + + static final MethodHandle MH_f; + static final MethodHandle MH_pred; + static final MethodHandle MH_c; + + static { + try { + MH_f = LOOKUP.findStatic(EMPTY, "f", MT_f); + MH_pred = LOOKUP.findStatic(EMPTY, "pred", MT_pred); + MH_c = LOOKUP.findStatic(EMPTY, "c", MT_c); + } catch (Exception e) { + throw new ExceptionInInitializerError(e); + } + } + } + + static class Fac { + + static int zero(int k) { + return 0; + } + + static int one(int k) { + return 1; + } + + static boolean pred(int i, int acc, int k) { + return i < k; + } + + static int inc(int i, int acc, int k) { + return i + 1; + } + + static int mult(int i, int acc, int k) { + return i * acc; + } + + static void dot(int i, int acc, int k) { + System.out.print('.'); + } + + static int fin(int i, int acc, int k) { + return acc; + } + + static final Class FAC = Fac.class; + + static final MethodType MT_init = methodType(int.class, int.class); + static final MethodType MT_fn = methodType(int.class, int.class, int.class, int.class); + static final MethodType MT_dot = methodType(void.class, int.class, int.class, int.class); + static final MethodType MT_pred = methodType(boolean.class, int.class, int.class, int.class); + + static final MethodHandle MH_zero; + static final MethodHandle MH_one; + static final MethodHandle MH_pred; + static final MethodHandle MH_inc; + static final MethodHandle MH_mult; + static final MethodHandle MH_dot; + static final MethodHandle MH_fin; + + static final MethodType MT_fac = methodType(int.class, int.class); + + static { + try { + MH_zero = LOOKUP.findStatic(FAC, "zero", MT_init); + MH_one = LOOKUP.findStatic(FAC, "one", MT_init); + MH_pred = LOOKUP.findStatic(FAC, "pred", MT_pred); + MH_inc = LOOKUP.findStatic(FAC, "inc", MT_fn); + MH_mult = LOOKUP.findStatic(FAC, "mult", MT_fn); + MH_dot = LOOKUP.findStatic(FAC, "dot", MT_dot); + MH_fin = LOOKUP.findStatic(FAC, "fin", MT_fn); + } catch (Exception e) { + throw new ExceptionInInitializerError(e); + } + } + + } + + static class Loop { + + static int inc(int i, int k) { + return i + 1; + } + + static boolean pred(int i, int k) { + return i < k; + } + + static int fin(int i, int k) { + return k; + } + + static final Class LOOP = Loop.class; + + static final MethodType MT_inc = methodType(int.class, int.class, int.class); + static final MethodType MT_pred = methodType(boolean.class, int.class, int.class); + static final MethodType MT_fin = methodType(int.class, int.class, int.class); + + static final MethodHandle MH_inc; + static final MethodHandle MH_pred; + static final MethodHandle MH_fin; + + static final MethodType MT_loop = methodType(int.class, int.class); + + static { + try { + MH_inc = LOOKUP.findStatic(LOOP, "inc", MT_inc); + MH_pred = LOOKUP.findStatic(LOOP, "pred", MT_pred); + MH_fin = LOOKUP.findStatic(LOOP, "fin", MT_fin); + } catch (Exception e) { + throw new ExceptionInInitializerError(e); + } + } + + } + + static class LoopWithVirtuals { + + static int one(int k) { + return 1; + } + + int inc(int i, int acc, int k) { + return i + 1; + } + + int mult(int i, int acc, int k) { + return i * acc; + } + + boolean pred(int i, int acc, int k) { + return i < k; + } + + int fin(int i, int acc, int k) { + return acc; + } + + static final Class LOOP_WITH_VIRTUALS = LoopWithVirtuals.class; + + static final MethodType MT_one = methodType(int.class, int.class); + static final MethodType MT_inc = methodType(int.class, int.class, int.class, int.class); + static final MethodType MT_mult = methodType(int.class, int.class, int.class, int.class); + static final MethodType MT_pred = methodType(boolean.class, int.class, int.class, int.class); + static final MethodType MT_fin = methodType(int.class, int.class, int.class, int.class); + + static final MethodHandle MH_one; + static final MethodHandle MH_inc; + static final MethodHandle MH_mult; + static final MethodHandle MH_pred; + static final MethodHandle MH_fin; + + static final MethodType MT_loop = methodType(int.class, LOOP_WITH_VIRTUALS, int.class); + + static { + try { + MH_one = LOOKUP.findStatic(LOOP_WITH_VIRTUALS, "one", MT_one); + MH_inc = LOOKUP.findVirtual(LOOP_WITH_VIRTUALS, "inc", MT_inc); + MH_mult = LOOKUP.findVirtual(LOOP_WITH_VIRTUALS, "mult", MT_mult); + MH_pred = LOOKUP.findVirtual(LOOP_WITH_VIRTUALS, "pred", MT_pred); + MH_fin = LOOKUP.findVirtual(LOOP_WITH_VIRTUALS, "fin", MT_fin); + } catch (Exception e) { + throw new ExceptionInInitializerError(e); + } + } + + static MethodHandle permute(MethodHandle h) { + // The handles representing virtual methods need to be rearranged to match the required order of arguments + // (loop-local state comes first, then loop arguments). As the receiver comes first in the signature but is + // a loop argument, it must be moved to the appropriate position in the signature. + return MethodHandles.permuteArguments(h, + methodType(h.type().returnType(), int.class, int.class, LOOP_WITH_VIRTUALS, int.class), 2, 0, 1, 3); + } + + } + + static class While { + + static int zero(int limit) { + return 0; + } + + static boolean pred(int i, int limit) { + return i < limit; + } + + static int step(int i, int limit) { + return i + 1; + } + + static String initString() { + return "a"; + } + + static boolean predString(String s) { + return s.length() != 1; + } + + static String stepString(String s) { + return s + "a"; + } + + static List zipInitZip(Iterator a, Iterator b) { + return new ArrayList<>(); + } + + static boolean zipPred(List zip, Iterator a, Iterator b) { + return a.hasNext() && b.hasNext(); + } + + static List zipStep(List zip, Iterator a, Iterator b) { + zip.add(a.next()); + zip.add(b.next()); + return zip; + } + + static final Class WHILE = While.class; + + static final MethodType MT_zero = methodType(int.class, int.class); + static final MethodType MT_pred = methodType(boolean.class, int.class, int.class); + static final MethodType MT_fn = methodType(int.class, int.class, int.class); + static final MethodType MT_initString = methodType(String.class); + static final MethodType MT_predString = methodType(boolean.class, String.class); + static final MethodType MT_stepString = methodType(String.class, String.class); + static final MethodType MT_zipInitZip = methodType(List.class, Iterator.class, Iterator.class); + static final MethodType MT_zipPred = methodType(boolean.class, List.class, Iterator.class, Iterator.class); + static final MethodType MT_zipStep = methodType(List.class, List.class, Iterator.class, Iterator.class); + + static final MethodHandle MH_zero; + static final MethodHandle MH_pred; + static final MethodHandle MH_step; + static final MethodHandle MH_initString; + static final MethodHandle MH_predString; + static final MethodHandle MH_stepString; + static final MethodHandle MH_zipInitZip; + static final MethodHandle MH_zipPred; + static final MethodHandle MH_zipStep; + + static final MethodType MT_while = methodType(int.class, int.class); + static final MethodType MT_string = methodType(String.class); + static final MethodType MT_zip = methodType(List.class, Iterator.class, Iterator.class); + + static { + try { + MH_zero = LOOKUP.findStatic(WHILE, "zero", MT_zero); + MH_pred = LOOKUP.findStatic(WHILE, "pred", MT_pred); + MH_step = LOOKUP.findStatic(WHILE, "step", MT_fn); + MH_initString = LOOKUP.findStatic(WHILE, "initString", MT_initString); + MH_predString = LOOKUP.findStatic(WHILE, "predString", MT_predString); + MH_stepString = LOOKUP.findStatic(WHILE, "stepString", MT_stepString); + MH_zipInitZip = LOOKUP.findStatic(WHILE, "zipInitZip", MT_zipInitZip); + MH_zipPred = LOOKUP.findStatic(WHILE, "zipPred", MT_zipPred); + MH_zipStep = LOOKUP.findStatic(WHILE, "zipStep", MT_zipStep); + } catch (Exception e) { + throw new ExceptionInInitializerError(e); + } + } + + } + + static class Counted { + + static String start(String arg) { + return arg; + } + + static String step(int counter, String v, String arg) { + return "na " + v; + } + + static void stepUpdateArray(int counter, int[] a) { + ++a[0]; + } + + static void printHello(int counter) { + System.out.print("hello"); + } + + static final Class COUNTED = Counted.class; + + static final MethodType MT_start = methodType(String.class, String.class); + static final MethodType MT_step = methodType(String.class, int.class, String.class, String.class); + static final MethodType MT_stepUpdateArray = methodType(void.class, int.class, int[].class); + static final MethodType MT_printHello = methodType(void.class, int.class); + + static final MethodHandle MH_13; + static final MethodHandle MH_m5; + static final MethodHandle MH_8; + static final MethodHandle MH_start; + static final MethodHandle MH_step; + static final MethodHandle MH_stepUpdateArray; + static final MethodHandle MH_printHello; + + static final MethodType MT_counted = methodType(String.class, String.class); + static final MethodType MT_arrayCounted = methodType(void.class, int[].class); + static final MethodType MT_countedPrinting = methodType(void.class); + + static { + try { + MH_13 = MethodHandles.constant(int.class, 13); + MH_m5 = MethodHandles.constant(int.class, -5); + MH_8 = MethodHandles.constant(int.class, 8); + MH_start = LOOKUP.findStatic(COUNTED, "start", MT_start); + MH_step = LOOKUP.findStatic(COUNTED, "step", MT_step); + MH_stepUpdateArray = LOOKUP.findStatic(COUNTED, "stepUpdateArray", MT_stepUpdateArray); + MH_printHello = LOOKUP.findStatic(COUNTED, "printHello", MT_printHello); + } catch (Exception e) { + throw new ExceptionInInitializerError(e); + } + } + + } + + static class Iterate { + + static Iterator sumIterator(Integer[] a) { + return Arrays.asList(a).iterator(); + } + + static int sumInit(Integer[] a) { + return 0; + } + + static int sumStep(int s, int e, Integer[] a) { + return s + e; + } + + static List reverseInit(List l) { + return new ArrayList<>(); + } + + static List reverseStep(String e, List r, List l) { + r.add(0, e); + return r; + } + + static int lengthInit(List l) { + return 0; + } + + static int lengthStep(Object o, int len, List l) { + return len + 1; + } + + static List mapInit(List l) { + return new ArrayList<>(); + } + + static List mapStep(String e, List r, List l) { + r.add(e.toUpperCase()); + return r; + } + + static void printStep(String s, List l) { + System.out.print(s); + } + + static final Class ITERATE = Iterate.class; + + static final MethodType MT_sumIterator = methodType(Iterator.class, Integer[].class); + + static final MethodType MT_sumInit = methodType(int.class, Integer[].class); + static final MethodType MT_reverseInit = methodType(List.class, List.class); + static final MethodType MT_lenghInit = methodType(int.class, List.class); + static final MethodType MT_mapInit = methodType(List.class, List.class); + + static final MethodType MT_sumStep = methodType(int.class, int.class, int.class, Integer[].class); + static final MethodType MT_reverseStep = methodType(List.class, String.class, List.class, List.class); + static final MethodType MT_lengthStep = methodType(int.class, Object.class, int.class, List.class); + static final MethodType MT_mapStep = methodType(List.class, String.class, List.class, List.class); + static final MethodType MT_printStep = methodType(void.class, String.class, List.class); + + static final MethodHandle MH_sumIterator; + static final MethodHandle MH_sumInit; + static final MethodHandle MH_sumStep; + static final MethodHandle MH_printStep; + + static final MethodHandle MH_reverseInit; + static final MethodHandle MH_reverseStep; + + static final MethodHandle MH_lengthInit; + static final MethodHandle MH_lengthStep; + + static final MethodHandle MH_mapInit; + static final MethodHandle MH_mapStep; + + static final MethodType MT_sum = methodType(int.class, Integer[].class); + static final MethodType MT_reverse = methodType(List.class, List.class); + static final MethodType MT_length = methodType(int.class, List.class); + static final MethodType MT_map = methodType(List.class, List.class); + static final MethodType MT_print = methodType(void.class, List.class); + + static { + try { + MH_sumIterator = LOOKUP.findStatic(ITERATE, "sumIterator", MT_sumIterator); + MH_sumInit = LOOKUP.findStatic(ITERATE, "sumInit", MT_sumInit); + MH_sumStep = LOOKUP.findStatic(ITERATE, "sumStep", MT_sumStep); + MH_reverseInit = LOOKUP.findStatic(ITERATE, "reverseInit", MT_reverseInit); + MH_reverseStep = LOOKUP.findStatic(ITERATE, "reverseStep", MT_reverseStep); + MH_lengthInit = LOOKUP.findStatic(ITERATE, "lengthInit", MT_lenghInit); + MH_lengthStep = LOOKUP.findStatic(ITERATE, "lengthStep", MT_lengthStep); + MH_mapInit = LOOKUP.findStatic(ITERATE, "mapInit", MT_mapInit); + MH_mapStep = LOOKUP.findStatic(ITERATE, "mapStep", MT_mapStep); + MH_printStep = LOOKUP.findStatic(ITERATE, "printStep", MT_printStep); + } catch (Exception e) { + throw new ExceptionInInitializerError(e); + } + } + + } + +}