| // Copyright (c) 2022, the R8 project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| package com.android.tools.r8.rewrite.arrays; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assume.assumeFalse; |
| |
| import com.android.tools.r8.CompilationMode; |
| import com.android.tools.r8.Keep; |
| import com.android.tools.r8.NeverInline; |
| import com.android.tools.r8.TestBase; |
| import com.android.tools.r8.TestParameters; |
| import com.android.tools.r8.dex.code.DexFillArrayData; |
| import com.android.tools.r8.dex.code.DexFilledNewArray; |
| import com.android.tools.r8.dex.code.DexFilledNewArrayRange; |
| import com.android.tools.r8.dex.code.DexNewArray; |
| import com.android.tools.r8.references.Reference; |
| import com.android.tools.r8.transformers.ClassFileTransformer; |
| import com.android.tools.r8.utils.AndroidApiLevel; |
| import com.android.tools.r8.utils.codeinspector.ClassSubject; |
| import com.android.tools.r8.utils.codeinspector.CodeInspector; |
| import com.android.tools.r8.utils.codeinspector.InstructionSubject; |
| import com.android.tools.r8.utils.codeinspector.MethodSubject; |
| import com.google.common.collect.Lists; |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.function.Predicate; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.Parameterized; |
| import org.junit.runners.Parameterized.Parameters; |
| |
| @RunWith(Parameterized.class) |
| public class SimplifyArrayConstructionTest extends TestBase { |
| @Parameters(name = "{0}, mode = {1}") |
| public static Iterable<?> data() { |
| return buildParameters( |
| getTestParameters().withDefaultCfRuntime().withDexRuntimesAndAllApiLevels().build(), |
| CompilationMode.values()); |
| } |
| |
| private final TestParameters parameters; |
| private final CompilationMode compilationMode; |
| |
| public SimplifyArrayConstructionTest(TestParameters parameters, CompilationMode compilationMode) { |
| this.parameters = parameters; |
| this.compilationMode = compilationMode; |
| } |
| |
| private static final Class<?>[] DEX_ARRAY_INSTRUCTIONS = { |
| DexNewArray.class, DexFilledNewArray.class, DexFilledNewArrayRange.class, DexFillArrayData.class |
| }; |
| |
| private static final String[] EXPECTED_OUTPUT = { |
| "[a]", |
| "[a, 1, null]", |
| "[1, null]", |
| "[1, null, 2]", |
| "[1, null, 2]", |
| "[1]", |
| "[1, 2]", |
| "[1, 2, 3, 4, 5]", |
| "[1]", |
| "[a, 1, null, d, e, f]", |
| "[1, null, 3, null, null, 6]", |
| "[1, 2, 3, 4, 5, 6]", |
| "[true, false]", |
| "[1, 2]", |
| "[1, 2]", |
| "[1, 2]", |
| "[1.0, 2.0]", |
| "[1.0, 2.0]", |
| "[]", |
| "[]", |
| "[true]", |
| "[1]", |
| "[1]", |
| "[1]", |
| "[1.0]", |
| "[1.0]", |
| "[0, 1]", |
| "[1, null]", |
| "[a]", |
| "[0, 1]", |
| "200", |
| "[0, 1, 2, 3, 4]", |
| "[4, 0, 0, 0, 0]", |
| "[4, 1, 2, 3, 4]", |
| "[0, 1, 2]", |
| "[0]", |
| "[0, 1, 2]", |
| "[1, 2, 3]", |
| "[1, 2, 3, 4, 5, 6]", |
| "[0]", |
| "[null, null]", |
| }; |
| |
| private static final byte[] TRANSFORMED_MAIN = transformedMain(); |
| |
| @Test |
| public void testRuntime() throws Exception { |
| assumeFalse(compilationMode == CompilationMode.DEBUG); |
| testForRuntime( |
| parameters.getRuntime(), |
| d8TestBuilder -> d8TestBuilder.setMinApi(parameters).setMode(compilationMode)) |
| .addProgramClassFileData(TRANSFORMED_MAIN) |
| .run(parameters.getRuntime(), Main.class) |
| .assertSuccessWithOutputLines(EXPECTED_OUTPUT) |
| .inspect(inspector -> inspect(inspector, false)); |
| } |
| |
| @Test |
| public void testR8() throws Exception { |
| testForR8(parameters.getBackend()) |
| .setMinApi(parameters) |
| .addOptionsModification( |
| options -> |
| options |
| .getOpenClosedInterfacesOptions() |
| .suppressSingleOpenInterface(Reference.classFromClass(Serializable.class))) |
| .setMode(compilationMode) |
| .addProgramClassFileData(TRANSFORMED_MAIN) |
| .addKeepMainRule(Main.class) |
| .enableInliningAnnotations() |
| .addKeepAnnotation() |
| .addKeepRules("-keepclassmembers class * { @com.android.tools.r8.Keep *; }") |
| .addKeepRules("-assumenosideeffects class * { *** assumedNullField return null; }") |
| .addKeepRules("-assumenosideeffects class * { *** assumedNonNullField return _NONNULL_; }") |
| .addDontObfuscate() |
| .run(parameters.getRuntime(), Main.class) |
| .assertSuccessWithOutputLines(EXPECTED_OUTPUT) |
| .inspect(inspector -> inspect(inspector, true)); |
| } |
| |
| private static byte[] transformedMain() { |
| try { |
| return transformer(Main.class) |
| .transformMethodInsnInMethod( |
| "interfaceArrayWithRawObject", |
| (opcode, owner, name, descriptor, isInterface, visitor) -> { |
| if (name.equals("getObjectThatImplementsSerializable")) { |
| visitor.visitMethodInsn(opcode, owner, name, "()Ljava/lang/Object;", isInterface); |
| } else { |
| visitor.visitMethodInsn(opcode, owner, name, descriptor, isInterface); |
| } |
| }) |
| .setReturnType( |
| ClassFileTransformer.MethodPredicate.onName("getObjectThatImplementsSerializable"), |
| Object.class.getTypeName()) |
| .transform(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| private void inspect(CodeInspector inspector, boolean isR8) { |
| if (parameters.isCfRuntime()) { |
| return; |
| } |
| ClassSubject mainClass = inspector.clazz(Main.class); |
| assertTrue(mainClass.isPresent()); |
| |
| MethodSubject stringArrays = mainClass.uniqueMethodWithOriginalName("stringArrays"); |
| MethodSubject referenceArraysNoCasts = |
| mainClass.uniqueMethodWithOriginalName("referenceArraysNoCasts"); |
| MethodSubject referenceArraysWithSubclasses = |
| mainClass.uniqueMethodWithOriginalName("referenceArraysWithSubclasses"); |
| MethodSubject referenceArraysWithInterfaceImplementations = |
| mainClass.uniqueMethodWithOriginalName("referenceArraysWithInterfaceImplementations"); |
| MethodSubject interfaceArrayWithRawObject = |
| mainClass.uniqueMethodWithOriginalName("interfaceArrayWithRawObject"); |
| |
| MethodSubject phiFilledNewArray = mainClass.uniqueMethodWithOriginalName("phiFilledNewArray"); |
| MethodSubject intsThatUseFilledNewArray = |
| mainClass.uniqueMethodWithOriginalName("intsThatUseFilledNewArray"); |
| MethodSubject twoDimensionalArrays = |
| mainClass.uniqueMethodWithOriginalName("twoDimensionalArrays"); |
| MethodSubject objectArraysFilledNewArrayRange = |
| mainClass.uniqueMethodWithOriginalName("objectArraysFilledNewArrayRange"); |
| MethodSubject arraysThatUseFilledData = |
| mainClass.uniqueMethodWithOriginalName("arraysThatUseFilledData"); |
| MethodSubject arraysThatUseNewArrayEmpty = |
| mainClass.uniqueMethodWithOriginalName("arraysThatUseNewArrayEmpty"); |
| MethodSubject reversedArray = mainClass.uniqueMethodWithOriginalName("reversedArray"); |
| MethodSubject arrayWithCorrectCountButIncompleteCoverage = |
| mainClass.uniqueMethodWithOriginalName("arrayWithCorrectCountButIncompleteCoverage"); |
| MethodSubject arrayWithExtraInitialPuts = |
| mainClass.uniqueMethodWithOriginalName("arrayWithExtraInitialPuts"); |
| MethodSubject catchHandlerThrowing = |
| mainClass.uniqueMethodWithOriginalName("catchHandlerThrowing"); |
| MethodSubject catchHandlerNonThrowingFilledNewArray = |
| mainClass.uniqueMethodWithOriginalName("catchHandlerNonThrowingFilledNewArray"); |
| MethodSubject catchHandlerNonThrowingFillArrayData = |
| mainClass.uniqueMethodWithOriginalName("catchHandlerNonThrowingFillArrayData"); |
| MethodSubject assumedValues = mainClass.uniqueMethodWithOriginalName("assumedValues"); |
| |
| assertArrayTypes(arraysThatUseNewArrayEmpty, DexNewArray.class); |
| assertArrayTypes(intsThatUseFilledNewArray, DexFilledNewArray.class); |
| assertFilledArrayData(arraysThatUseFilledData); |
| assertFilledArrayData(catchHandlerNonThrowingFillArrayData); |
| |
| if (compilationMode == CompilationMode.DEBUG) { |
| // The explicit assignments can't be collapsed without breaking the debugger's ability to |
| // visit each line. |
| assertArrayTypes(reversedArray, DexNewArray.class); |
| } else { |
| assertArrayTypes(reversedArray, DexFilledNewArray.class); |
| } |
| |
| // Cannot use filled-new-array of String before K. |
| if (parameters.getApiLevel().isLessThan(AndroidApiLevel.K)) { |
| assertArrayTypes(stringArrays, DexNewArray.class); |
| } else { |
| assertArrayTypes(stringArrays, DexFilledNewArray.class); |
| } |
| // Cannot use filled-new-array of Object before L. |
| if (parameters.getApiLevel().isLessThan(AndroidApiLevel.N)) { |
| assertArrayTypes(referenceArraysNoCasts, DexNewArray.class); |
| assertArrayTypes(referenceArraysWithSubclasses, DexNewArray.class); |
| assertArrayTypes(referenceArraysWithInterfaceImplementations, DexNewArray.class); |
| assertArrayTypes(phiFilledNewArray, DexNewArray.class); |
| assertArrayTypes(objectArraysFilledNewArrayRange, DexNewArray.class); |
| assertArrayTypes(twoDimensionalArrays, DexNewArray.class); |
| assertArrayTypes(assumedValues, DexNewArray.class); |
| } else { |
| if (parameters.canUseSubTypesInFilledNewArray()) { |
| assertArrayTypes(referenceArraysNoCasts, DexFilledNewArray.class); |
| } else { |
| assertArrayTypes(referenceArraysNoCasts, DexNewArray.class, DexFilledNewArray.class); |
| } |
| if (isR8 && parameters.canUseSubTypesInFilledNewArray()) { |
| assertArrayTypes(referenceArraysWithSubclasses, DexFilledNewArray.class); |
| assertArrayTypes(referenceArraysWithInterfaceImplementations, DexFilledNewArray.class); |
| } else { |
| assertArrayTypes(referenceArraysWithSubclasses, DexNewArray.class); |
| assertArrayTypes(referenceArraysWithInterfaceImplementations, DexNewArray.class); |
| } |
| |
| // TODO(b/246971330): Add support for arrays whose values have conditionals. |
| // assertArrayTypes(phiFilledNewArray, DexFilledNewArray.class); |
| |
| assertArrayTypes( |
| objectArraysFilledNewArrayRange, DexFilledNewArrayRange.class, DexNewArray.class); |
| |
| if (parameters.getApiLevel().isGreaterThanOrEqualTo(AndroidApiLevel.L)) { |
| assertArrayTypes(twoDimensionalArrays, DexFilledNewArray.class); |
| } else { |
| // No need to assert this case. If it's wrong, Dalvik verify errors cause test failures. |
| } |
| |
| assertArrayTypes(assumedValues, DexFilledNewArray.class); |
| } |
| // filled-new-array fails verification when types of parameters are not subclasses (aput-object |
| // does not). |
| assertArrayTypes(interfaceArrayWithRawObject, DexNewArray.class); |
| |
| // These could be optimized to use InvokeNewArray, but they seem like rare code patterns so we |
| // haven't bothered. |
| assertArrayTypes(arrayWithExtraInitialPuts, DexNewArray.class); |
| assertArrayTypes(arrayWithCorrectCountButIncompleteCoverage, DexNewArray.class); |
| |
| assertArrayTypes(catchHandlerThrowing, DexNewArray.class); |
| assertArrayTypes(catchHandlerNonThrowingFilledNewArray, DexFilledNewArray.class); |
| } |
| |
| private static Predicate<InstructionSubject> isInstruction(List<Class<?>> allowlist) { |
| return (ins) -> allowlist.contains(ins.asDexInstruction().getInstruction().getClass()); |
| } |
| |
| private static Predicate<InstructionSubject> isInstruction(Class<?> clazz) { |
| return isInstruction(Arrays.asList(clazz)); |
| } |
| |
| private static void assertArrayTypes(MethodSubject method, Class<?>... allowedArrayInst) { |
| assertTrue(method.isPresent()); |
| List<Class<?>> disallowedClasses = Lists.newArrayList(DEX_ARRAY_INSTRUCTIONS); |
| for (Class<?> allowedArr : allowedArrayInst) { |
| disallowedClasses.remove(allowedArr); |
| } |
| assertTrue( |
| method.streamInstructions().anyMatch(isInstruction(Arrays.asList(allowedArrayInst)))); |
| assertTrue(method.streamInstructions().noneMatch(isInstruction(disallowedClasses))); |
| } |
| |
| private static void assertFilledArrayData(MethodSubject method) { |
| assertTrue(method.isPresent()); |
| List<Class<?>> disallowedClasses = Lists.newArrayList(DEX_ARRAY_INSTRUCTIONS); |
| disallowedClasses.remove(DexFillArrayData.class); |
| disallowedClasses.remove(DexNewArray.class); |
| |
| assertTrue(method.streamInstructions().noneMatch(isInstruction(disallowedClasses))); |
| assertTrue(method.streamInstructions().noneMatch(InstructionSubject::isArrayPut)); |
| long numNewArray = method.streamInstructions().filter(InstructionSubject::isNewArray).count(); |
| long numFillArray = |
| method.streamInstructions().filter(isInstruction(DexFillArrayData.class)).count(); |
| assertEquals(numNewArray, numFillArray); |
| } |
| |
| public static final class Main { |
| static final String assumedNonNullField = null; |
| static final String assumedNullField = null; |
| |
| public static void main(String[] args) { |
| stringArrays(); |
| referenceArraysNoCasts(); |
| referenceArraysWithSubclasses(); |
| referenceArraysWithInterfaceImplementations(); |
| interfaceArrayWithRawObject(); |
| phiFilledNewArray(); |
| intsThatUseFilledNewArray(); |
| twoDimensionalArrays(); |
| objectArraysFilledNewArrayRange(); |
| arraysThatUseFilledData(); |
| arraysThatUseNewArrayEmpty(); |
| reversedArray(); |
| arrayWithCorrectCountButIncompleteCoverage(); |
| arrayWithExtraInitialPuts(); |
| catchHandlerThrowing(); |
| catchHandlerNonThrowingFilledNewArray(); |
| catchHandlerNonThrowingFillArrayData(); |
| arrayIntoAnotherArray(); |
| assumedValues(); |
| } |
| |
| @NeverInline |
| private static void stringArrays() { |
| // Test exact class, no null. |
| String[] stringArr = {"a"}; |
| System.out.println(Arrays.toString(stringArr)); |
| } |
| |
| @NeverInline |
| private static void referenceArraysNoCasts() { |
| // Tests that no type info is needed when array type is Object[]. |
| Object[] objectArr = {"a", 1, null}; |
| System.out.println(Arrays.toString(objectArr)); |
| // Test that interface arrays work when we have the exact interface already. |
| Serializable[] interfaceArr = {getSerializable(1), null}; |
| System.out.println(Arrays.toString(interfaceArr)); |
| } |
| |
| @Keep |
| private static Serializable getSerializable(Integer value) { |
| return value; |
| } |
| |
| @NeverInline |
| private static void referenceArraysWithInterfaceImplementations() { |
| Serializable[] interfaceArr = {1, null, 2}; |
| System.out.println(Arrays.toString(interfaceArr)); |
| } |
| |
| @NeverInline |
| private static void referenceArraysWithSubclasses() { |
| Number[] objArray = {1, null, 2}; |
| System.out.println(Arrays.toString(objArray)); |
| } |
| |
| @NeverInline |
| private static void interfaceArrayWithRawObject() { |
| // Interfaces can use filled-new-array only when we know types implement the interface. |
| Serializable[] arr = new Serializable[1]; |
| // Transformed from `I get()` to `Object get()`. |
| arr[0] = getObjectThatImplementsSerializable(); |
| System.out.println(Arrays.toString(arr)); |
| } |
| |
| @Keep |
| private static /*Object*/ Serializable getObjectThatImplementsSerializable() { |
| return 1; |
| } |
| |
| @NeverInline |
| private static void reversedArray() { |
| int[] arr = new int[5]; |
| arr[4] = 4; |
| arr[3] = 3; |
| arr[2] = 2; |
| arr[1] = 1; |
| arr[0] = 0; |
| System.out.println(Arrays.toString(arr)); |
| } |
| |
| @NeverInline |
| private static void arrayWithCorrectCountButIncompleteCoverage() { |
| int[] arr = new int[5]; |
| arr[0] = 0; |
| arr[0] = 1; |
| arr[0] = 2; |
| arr[0] = 3; |
| arr[0] = 4; |
| System.out.println(Arrays.toString(arr)); |
| } |
| |
| @NeverInline |
| private static void arrayWithExtraInitialPuts() { |
| int[] arr = new int[5]; |
| arr[0] = 0; |
| arr[0] = 1; |
| arr[0] = 2; |
| arr[0] = 3; |
| arr[0] = 4; |
| arr[1] = 1; |
| arr[2] = 2; |
| arr[3] = 3; |
| arr[4] = 4; |
| System.out.println(Arrays.toString(arr)); |
| } |
| |
| @NeverInline |
| private static void catchHandlerNonThrowingFilledNewArray() { |
| try { |
| int[] arr1 = {1, 2, 3}; |
| System.currentTimeMillis(); |
| System.out.println(Arrays.toString(arr1)); |
| } catch (Throwable t) { |
| throw new RuntimeException(t); |
| } |
| } |
| |
| @NeverInline |
| private static void catchHandlerNonThrowingFillArrayData() { |
| try { |
| int[] arr = {1, 2, 3, 4, 5, 6}; |
| System.currentTimeMillis(); |
| System.out.println(Arrays.toString(arr)); |
| } catch (Throwable t) { |
| throw new RuntimeException(t); |
| } |
| } |
| |
| @NeverInline |
| private static void catchHandlerThrowing() { |
| int[] arr1 = new int[3]; |
| arr1[0] = 0; |
| arr1[1] = 1; |
| // Since the array is used in only one spot, and that spot is not within the try/catch, it |
| // should be safe to use filled-new-array, but we don't. |
| try { |
| System.currentTimeMillis(); |
| arr1[2] = 2; |
| } catch (Throwable t) { |
| throw new RuntimeException(t); |
| } |
| System.out.println(Arrays.toString(arr1)); |
| |
| try { |
| // Test filled-new-array with a throwing instruction before the last array-put. |
| int[] arr2 = new int[1]; |
| System.currentTimeMillis(); |
| arr2[0] = 0; |
| System.out.println(Arrays.toString(arr2)); |
| |
| // Test filled-array-data with a throwing instruction before the last array-put. |
| short[] arr3 = new short[3]; |
| arr3[0] = 0; |
| arr3[1] = 1; |
| System.currentTimeMillis(); |
| arr3[2] = 2; |
| System.out.println(Arrays.toString(arr3)); |
| } catch (Throwable t) { |
| throw new RuntimeException(t); |
| } |
| } |
| |
| @NeverInline |
| private static void arrayIntoAnotherArray() { |
| // Tests that our computeValues() method does not assume all array-put-object users have |
| // the array as the target. |
| int[] intArr = new int[1]; |
| Object[] objArr = new Object[2]; |
| objArr[0] = intArr; |
| System.out.println(Arrays.toString((int[]) objArr[0])); |
| } |
| |
| @NeverInline |
| private static void assumedValues() { |
| Object[] arr = {assumedNonNullField, assumedNullField}; |
| System.out.println(Arrays.toString(arr)); |
| } |
| |
| @NeverInline |
| private static void phiFilledNewArray() { |
| // The presence of ? should not affect use of filled-new-array. |
| Integer[] phiArray = {1, System.nanoTime() > 0 ? 2 : 3}; |
| System.out.println(Arrays.toString(phiArray)); |
| } |
| |
| @NeverInline |
| private static void intsThatUseFilledNewArray() { |
| // Up to 5 ints uses filled-new-array rather than filled-array-data. |
| int[] intArr = {1, 2, 3, 4, 5}; |
| System.out.println(Arrays.toString(intArr)); |
| } |
| |
| @NeverInline |
| private static void twoDimensionalArrays() { |
| Integer[][] twoDimensions = {new Integer[] {1}, null}; |
| System.out.println(Arrays.toString(Arrays.asList(twoDimensions).get(0))); |
| } |
| |
| @NeverInline |
| private static void objectArraysFilledNewArrayRange() { |
| // 6 or more elements use /range variant. |
| Object[] objectArr = {"a", 1, null, "d", "e", "f"}; |
| System.out.println(Arrays.toString(objectArr)); |
| Serializable[] interfaceArr = { |
| getSerializable(1), null, getSerializable(3), null, null, getSerializable(6) |
| }; |
| System.out.println(Arrays.toString(interfaceArr)); |
| } |
| |
| @NeverInline |
| private static void arraysThatUseFilledData() { |
| // For int[], <= 5 elements should use NewArrayFilledData (otherwise NewFilledArray is used). |
| int[] intArr = {1, 2, 3, 4, 5, 6}; |
| // For other primitives, > 1 element leads to fill-array-data. |
| System.out.println(Arrays.toString(intArr)); |
| boolean[] boolArr = {true, false}; |
| System.out.println(Arrays.toString(boolArr)); |
| byte[] byteArr = {1, 2}; |
| System.out.println(Arrays.toString(byteArr)); |
| char[] charArr = {'1', '2'}; |
| System.out.println(Arrays.toString(charArr)); |
| long[] longArr = {1, 2}; |
| System.out.println(Arrays.toString(longArr)); |
| float[] floatArr = {1, 2}; |
| System.out.println(Arrays.toString(floatArr)); |
| double[] doubleArr = {1, 2}; |
| System.out.println(Arrays.toString(doubleArr)); |
| } |
| |
| @NeverInline |
| private static void arraysThatUseNewArrayEmpty() { |
| // int/object of size zero should not use filled-new-array. |
| int[] intArr = {}; |
| System.out.println(Arrays.toString(intArr)); |
| String[] strArr = {}; |
| System.out.println(Arrays.toString(strArr)); |
| |
| // Other primitives with size <= 1 should not use filled-array-data. |
| boolean[] boolArr = {true}; |
| System.out.println(Arrays.toString(boolArr)); |
| byte[] byteArr = {1}; |
| System.out.println(Arrays.toString(byteArr)); |
| char[] charArr = {'1'}; |
| System.out.println(Arrays.toString(charArr)); |
| long[] longArr = {1}; |
| System.out.println(Arrays.toString(longArr)); |
| float[] floatArr = {1}; |
| System.out.println(Arrays.toString(floatArr)); |
| double[] doubleArr = {1}; |
| System.out.println(Arrays.toString(doubleArr)); |
| |
| // Array used before all members are set. |
| int[] readArray = new int[2]; |
| readArray[0] = (int) (System.currentTimeMillis() / System.nanoTime()); |
| readArray[1] = readArray[0] + 1; |
| System.out.println(Arrays.toString(readArray)); |
| |
| // Array does not have all elements set (we could make this work, but likely this is rare). |
| Integer[] partialArray = new Integer[2]; |
| partialArray[0] = 1; |
| System.out.println(Arrays.toString(partialArray)); |
| |
| // Non-constant array size. |
| int trickyZero = (int) (System.currentTimeMillis() / System.nanoTime()); |
| Object[] nonConstSize = new Object[trickyZero + 1]; |
| nonConstSize[0] = "a"; |
| System.out.println(Arrays.toString(nonConstSize)); |
| |
| // Non-constant index. |
| Object[] nonConstIndex = new Object[2]; |
| nonConstIndex[trickyZero] = 0; |
| nonConstIndex[trickyZero + 1] = 1; |
| System.out.println(Arrays.toString(nonConstIndex)); |
| |
| // Exceeds our (arbitrary) size limit for /range. |
| String[] bigArr = new String[201]; |
| bigArr[0] = "0"; |
| bigArr[1] = "1"; |
| bigArr[2] = "2"; |
| bigArr[3] = "3"; |
| bigArr[4] = "4"; |
| bigArr[5] = "5"; |
| bigArr[6] = "6"; |
| bigArr[7] = "7"; |
| bigArr[8] = "8"; |
| bigArr[9] = "9"; |
| bigArr[10] = "10"; |
| bigArr[11] = "11"; |
| bigArr[12] = "12"; |
| bigArr[13] = "13"; |
| bigArr[14] = "14"; |
| bigArr[15] = "15"; |
| bigArr[16] = "16"; |
| bigArr[17] = "17"; |
| bigArr[18] = "18"; |
| bigArr[19] = "19"; |
| bigArr[20] = "20"; |
| bigArr[21] = "21"; |
| bigArr[22] = "22"; |
| bigArr[23] = "23"; |
| bigArr[24] = "24"; |
| bigArr[25] = "25"; |
| bigArr[26] = "26"; |
| bigArr[27] = "27"; |
| bigArr[28] = "28"; |
| bigArr[29] = "29"; |
| bigArr[30] = "30"; |
| bigArr[31] = "31"; |
| bigArr[32] = "32"; |
| bigArr[33] = "33"; |
| bigArr[34] = "34"; |
| bigArr[35] = "35"; |
| bigArr[36] = "36"; |
| bigArr[37] = "37"; |
| bigArr[38] = "38"; |
| bigArr[39] = "39"; |
| bigArr[40] = "40"; |
| bigArr[41] = "41"; |
| bigArr[42] = "42"; |
| bigArr[43] = "43"; |
| bigArr[44] = "44"; |
| bigArr[45] = "45"; |
| bigArr[46] = "46"; |
| bigArr[47] = "47"; |
| bigArr[48] = "48"; |
| bigArr[49] = "49"; |
| bigArr[50] = "50"; |
| bigArr[51] = "51"; |
| bigArr[52] = "52"; |
| bigArr[53] = "53"; |
| bigArr[54] = "54"; |
| bigArr[55] = "55"; |
| bigArr[56] = "56"; |
| bigArr[57] = "57"; |
| bigArr[58] = "58"; |
| bigArr[59] = "59"; |
| bigArr[60] = "60"; |
| bigArr[61] = "61"; |
| bigArr[62] = "62"; |
| bigArr[63] = "63"; |
| bigArr[64] = "64"; |
| bigArr[65] = "65"; |
| bigArr[66] = "66"; |
| bigArr[67] = "67"; |
| bigArr[68] = "68"; |
| bigArr[69] = "69"; |
| bigArr[70] = "70"; |
| bigArr[71] = "71"; |
| bigArr[72] = "72"; |
| bigArr[73] = "73"; |
| bigArr[74] = "74"; |
| bigArr[75] = "75"; |
| bigArr[76] = "76"; |
| bigArr[77] = "77"; |
| bigArr[78] = "78"; |
| bigArr[79] = "79"; |
| bigArr[80] = "80"; |
| bigArr[81] = "81"; |
| bigArr[82] = "82"; |
| bigArr[83] = "83"; |
| bigArr[84] = "84"; |
| bigArr[85] = "85"; |
| bigArr[86] = "86"; |
| bigArr[87] = "87"; |
| bigArr[88] = "88"; |
| bigArr[89] = "89"; |
| bigArr[90] = "90"; |
| bigArr[91] = "91"; |
| bigArr[92] = "92"; |
| bigArr[93] = "93"; |
| bigArr[94] = "94"; |
| bigArr[95] = "95"; |
| bigArr[96] = "96"; |
| bigArr[97] = "97"; |
| bigArr[98] = "98"; |
| bigArr[99] = "99"; |
| bigArr[100] = "100"; |
| bigArr[101] = "101"; |
| bigArr[102] = "102"; |
| bigArr[103] = "103"; |
| bigArr[104] = "104"; |
| bigArr[105] = "105"; |
| bigArr[106] = "106"; |
| bigArr[107] = "107"; |
| bigArr[108] = "108"; |
| bigArr[109] = "109"; |
| bigArr[110] = "110"; |
| bigArr[111] = "111"; |
| bigArr[112] = "112"; |
| bigArr[113] = "113"; |
| bigArr[114] = "114"; |
| bigArr[115] = "115"; |
| bigArr[116] = "116"; |
| bigArr[117] = "117"; |
| bigArr[118] = "118"; |
| bigArr[119] = "119"; |
| bigArr[120] = "120"; |
| bigArr[121] = "121"; |
| bigArr[122] = "122"; |
| bigArr[123] = "123"; |
| bigArr[124] = "124"; |
| bigArr[125] = "125"; |
| bigArr[126] = "126"; |
| bigArr[127] = "127"; |
| bigArr[128] = "128"; |
| bigArr[129] = "129"; |
| bigArr[130] = "130"; |
| bigArr[131] = "131"; |
| bigArr[132] = "132"; |
| bigArr[133] = "133"; |
| bigArr[134] = "134"; |
| bigArr[135] = "135"; |
| bigArr[136] = "136"; |
| bigArr[137] = "137"; |
| bigArr[138] = "138"; |
| bigArr[139] = "139"; |
| bigArr[140] = "140"; |
| bigArr[141] = "141"; |
| bigArr[142] = "142"; |
| bigArr[143] = "143"; |
| bigArr[144] = "144"; |
| bigArr[145] = "145"; |
| bigArr[146] = "146"; |
| bigArr[147] = "147"; |
| bigArr[148] = "148"; |
| bigArr[149] = "149"; |
| bigArr[150] = "150"; |
| bigArr[151] = "151"; |
| bigArr[152] = "152"; |
| bigArr[153] = "153"; |
| bigArr[154] = "154"; |
| bigArr[155] = "155"; |
| bigArr[156] = "156"; |
| bigArr[157] = "157"; |
| bigArr[158] = "158"; |
| bigArr[159] = "159"; |
| bigArr[160] = "160"; |
| bigArr[161] = "161"; |
| bigArr[162] = "162"; |
| bigArr[163] = "163"; |
| bigArr[164] = "164"; |
| bigArr[165] = "165"; |
| bigArr[166] = "166"; |
| bigArr[167] = "167"; |
| bigArr[168] = "168"; |
| bigArr[169] = "169"; |
| bigArr[170] = "170"; |
| bigArr[171] = "171"; |
| bigArr[172] = "172"; |
| bigArr[173] = "173"; |
| bigArr[174] = "174"; |
| bigArr[175] = "175"; |
| bigArr[176] = "176"; |
| bigArr[177] = "177"; |
| bigArr[178] = "178"; |
| bigArr[179] = "179"; |
| bigArr[180] = "180"; |
| bigArr[181] = "181"; |
| bigArr[182] = "182"; |
| bigArr[183] = "183"; |
| bigArr[184] = "184"; |
| bigArr[185] = "185"; |
| bigArr[186] = "186"; |
| bigArr[187] = "187"; |
| bigArr[188] = "188"; |
| bigArr[189] = "189"; |
| bigArr[190] = "190"; |
| bigArr[191] = "191"; |
| bigArr[192] = "192"; |
| bigArr[193] = "193"; |
| bigArr[194] = "194"; |
| bigArr[195] = "195"; |
| bigArr[196] = "196"; |
| bigArr[197] = "197"; |
| bigArr[198] = "198"; |
| bigArr[199] = "199"; |
| bigArr[200] = "200"; |
| System.out.println(Arrays.asList(bigArr).get(200)); |
| } |
| } |
| } |
