8150956: j.l.i.MethodHandles.whileLoop(...) and .iteratedLoop(...) throw unexpected exceptions in the case of 'init' return type is void
Reviewed-by: psandoz
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* accompanied this code).
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/* @test
* @bug 8139885
* @bug 8150635
* @bug 8150956
* @bug 8150957
* @bug 8153637
* @run testng/othervm -ea -esa test.java.lang.invoke.LoopCombinatorTest
*/
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 LoopCombinatorTest {
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<MethodHandle> inits = Arrays.asList(ii, id, i3);
List<Class<?>> ints = Arrays.asList(int.class, int.class, int.class);
List<MethodHandle> finis = Arrays.asList(Fac.MH_fin, Fac.MH_inc, Counted.MH_step);
List<MethodHandle> preds1 = Arrays.asList(null, null, null);
List<MethodHandle> preds2 = Arrays.asList(null, Fac.MH_fin, null);
MethodHandle eek = MethodHandles.dropArguments(i0, 0, int.class, int.class, double.class);
List<MethodHandle> nesteps = Arrays.asList(Fac.MH_inc, eek, Fac.MH_dot);
List<MethodHandle> nepreds = Arrays.asList(null, Fac.MH_pred, null);
List<MethodHandle> nefinis = Arrays.asList(null, Fac.MH_fin, null);
List<MethodHandle> lvsteps = Arrays.asList(LoopWithVirtuals.MH_inc, LoopWithVirtuals.MH_mult);
List<MethodHandle> lvpreds = Arrays.asList(null, LoopWithVirtuals.MH_pred);
List<MethodHandle> 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 testDoWhileNullInit() throws Throwable {
While w = new While();
int v = 5;
MethodHandle loop = MethodHandles.doWhileLoop(null, While.MH_voidBody.bindTo(w), While.MH_voidPred.bindTo(w));
assertEquals(While.MT_void, loop.type());
loop.invoke(v);
assertEquals(v, w.i);
}
@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<String> a = Arrays.asList("a", "b", "c", "d");
List<String> b = Arrays.asList("e", "f", "g", "h");
List<String> zipped = Arrays.asList("a", "e", "b", "f", "c", "g", "d", "h");
assertEquals(zipped, (List<String>) loop.invoke(a.iterator(), b.iterator()));
}
@Test
public static void testWhileNullInit() throws Throwable {
While w = new While();
int v = 5;
MethodHandle loop = MethodHandles.whileLoop(null, While.MH_voidPred.bindTo(w), While.MH_voidBody.bindTo(w));
assertEquals(While.MT_void, loop.type());
loop.invoke(v);
assertEquals(v, w.i);
}
@Test
public static void testWhileVoidInit() throws Throwable {
While w = new While();
int v = 5;
MethodHandle loop = MethodHandles.whileLoop(While.MH_voidInit.bindTo(w), While.MH_voidPred.bindTo(w),
While.MH_voidBody.bindTo(w));
assertEquals(While.MT_void, loop.type());
loop.invoke(v);
assertEquals(v, w.i);
}
@Test
public static void testDoWhileVoidInit() throws Throwable {
While w = new While();
int v = 5;
MethodHandle loop = MethodHandles.doWhileLoop(While.MH_voidInit.bindTo(w), While.MH_voidBody.bindTo(w),
While.MH_voidPred.bindTo(w));
assertEquals(While.MT_void, loop.type());
loop.invoke(v);
assertEquals(v, w.i);
}
@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 testCountedLoopVoidInit() throws Throwable {
MethodHandle fit5 = MethodHandles.constant(int.class, 5);
MethodHandle loop = MethodHandles.countedLoop(fit5, MethodHandles.zero(void.class), Counted.MH_printHello);
assertEquals(Counted.MT_countedPrinting, loop.type());
loop.invoke();
}
@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 testCountedLoopCounterInit() throws Throwable {
// int x = 0; for (int i = 0; i < 5; ++i) { x += i; } return x; => 10
// (only if counter's first value in body is 0)
MethodHandle iter = MethodHandles.constant(int.class, 5);
MethodHandle init = MethodHandles.constant(int.class, 0);
MethodHandle body = Counted.MH_addCounter;
MethodHandle loop = MethodHandles.countedLoop(iter, init, body);
assertEquals(Counted.MT_counterInit, loop.type());
assertEquals(10, loop.invoke());
}
@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<String> list = Arrays.asList("a", "b", "c", "d", "e");
List<String> reversedList = Arrays.asList("e", "d", "c", "b", "a");
assertEquals(reversedList, (List<String>) 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<Double> 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<String> list = Arrays.asList("Hello", "world", "!");
List<String> upList = Arrays.asList("HELLO", "WORLD", "!");
assertEquals(upList, (List<String>) 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.empty(methodType(Iterator.class, int.class)),
MethodHandles.identity(int.class), null);
} catch (IllegalArgumentException iae) {
assertEquals("iterated loop body must not be null", iae.getMessage());
caught = true;
}
assertTrue(caught);
}
@Test
public static void testIterateVoidIterator() {
boolean caught = false;
MethodType v = methodType(void.class);
try {
MethodHandles.iteratedLoop(MethodHandles.empty(v), null, MethodHandles.empty(v));
} catch(IllegalArgumentException iae) {
assertEquals("iteratedLoop first argument must have Iterator return type", iae.getMessage());
caught = true;
}
assertTrue(caught);
}
@Test
public static void testIterateVoidInit() throws Throwable {
MethodHandle loop = MethodHandles.iteratedLoop(null, Iterate.MH_voidInit, Iterate.MH_printStep);
assertEquals(Iterate.MT_print, loop.type());
loop.invoke(Arrays.asList("hello", "world"));
}
static class Empty {
static void f() { }
static boolean pred() {
return false;
}
static int c() {
return 23;
}
static final Class<Empty> 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 = 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 = 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<LoopWithVirtuals> 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<String> zipInitZip(Iterator<String> a, Iterator<String> b) {
return new ArrayList<>();
}
static boolean zipPred(List<String> zip, Iterator<String> a, Iterator<String> b) {
return a.hasNext() && b.hasNext();
}
static List<String> zipStep(List<String> zip, Iterator<String> a, Iterator<String> b) {
zip.add(a.next());
zip.add(b.next());
return zip;
}
private int i = 0;
void voidInit(int k) {
// empty
}
void voidBody(int k) {
++i;
}
boolean voidPred(int k) {
return i < k;
}
static final Class<While> 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 MethodType MT_voidInit = methodType(void.class, int.class);
static final MethodType MT_voidBody = methodType(void.class, int.class);
static final MethodType MT_voidPred = methodType(boolean.class, int.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 MethodHandle MH_voidInit;
static final MethodHandle MH_voidBody;
static final MethodHandle MH_voidPred;
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 final MethodType MT_void = methodType(void.class, int.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);
MH_voidInit = LOOKUP.findVirtual(WHILE, "voidInit", MT_voidInit);
MH_voidBody = LOOKUP.findVirtual(WHILE, "voidBody", MT_voidBody);
MH_voidPred = LOOKUP.findVirtual(WHILE, "voidPred", MT_voidPred);
} 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 int addCounter(int counter, int x) {
return x + counter;
}
static final Class<Counted> 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 MethodType MT_addCounter = methodType(int.class, int.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 MethodHandle MH_addCounter;
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 final MethodType MT_counterInit = methodType(int.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);
MH_addCounter = LOOKUP.findStatic(COUNTED, "addCounter", MT_addCounter);
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
}
}
static class Iterate {
static Iterator<Integer> 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<String> reverseInit(List<String> l) {
return new ArrayList<>();
}
static List<String> reverseStep(String e, List<String> r, List<String> l) {
r.add(0, e);
return r;
}
static int lengthInit(List<Double> l) {
return 0;
}
static int lengthStep(Object o, int len, List<Double> l) {
return len + 1;
}
static List<String> mapInit(List<String> l) {
return new ArrayList<>();
}
static List<String> mapStep(String e, List<String> r, List<String> l) {
r.add(e.toUpperCase());
return r;
}
static void printStep(String s, List<String> l) {
System.out.print(s);
}
static void voidInit() {
// empty
}
static final Class<Iterate> 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 MethodType MT_voidInit = methodType(void.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 MethodHandle MH_voidInit;
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);
MH_voidInit = LOOKUP.findStatic(ITERATE, "voidInit", MT_voidInit);
} catch (Exception e) {
throw new ExceptionInInitializerError(e);
}
}
}
}