Java tutorial
/* * The MIT License (MIT) * * Copyright (c) Despector <https://despector.voxelgenesis.com> * Copyright (c) contributors * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package org.spongepowered.test.decompile; import static org.objectweb.asm.Opcodes.*; import org.junit.Assert; import org.junit.Test; import org.objectweb.asm.Label; import org.objectweb.asm.MethodVisitor; import org.objectweb.asm.Type; import org.spongepowered.test.util.TestHelper; import org.spongepowered.test.util.TestMethodBuilder; public class TernaryTests { private static final Type THIS_TYPE = Type.getType(TernaryTests.class); @Test public void testSimple() { TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZI)V"); MethodVisitor mv = builder.getGenerator(); Label start = new Label(); mv.visitLabel(start); Label end = new Label(); Label l1 = new Label(); Label l2 = new Label(); mv.visitIntInsn(ILOAD, 0); mv.visitJumpInsn(IFEQ, l1); mv.visitIntInsn(BIPUSH, 6); mv.visitJumpInsn(GOTO, l2); mv.visitLabel(l1); mv.visitInsn(ICONST_3); mv.visitLabel(l2); mv.visitIntInsn(ISTORE, 1); mv.visitLabel(end); mv.visitInsn(RETURN); mv.visitLocalVariable("a", "Z", null, start, end, 0); mv.visitLocalVariable("i", "I", null, start, end, 1); String insn = TestHelper.getAsString(builder.finish(), "test_mth"); String good = "i = a ? 6 : 3;"; Assert.assertEquals(good, insn); } @Test public void testToField() { TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZI)V"); MethodVisitor mv = builder.getGenerator(); Label start = new Label(); mv.visitLabel(start); Label end = new Label(); Label l1 = new Label(); Label l2 = new Label(); mv.visitIntInsn(ILOAD, 0); mv.visitJumpInsn(IFEQ, l1); mv.visitIntInsn(BIPUSH, 6); mv.visitJumpInsn(GOTO, l2); mv.visitLabel(l1); mv.visitInsn(ICONST_3); mv.visitLabel(l2); mv.visitFieldInsn(PUTSTATIC, THIS_TYPE.getInternalName(), "afield", "I"); mv.visitLabel(end); mv.visitInsn(RETURN); mv.visitLocalVariable("a", "Z", null, start, end, 0); mv.visitLocalVariable("i", "I", null, start, end, 1); String insn = TestHelper.getAsString(builder.finish(), "test_mth"); String good = "org.spongepowered.test.decompile.TernaryTests.afield = a ? 6 : 3;"; Assert.assertEquals(good, insn); } @Test public void testNested() { TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZIZ)V"); MethodVisitor mv = builder.getGenerator(); Label start = new Label(); mv.visitLabel(start); Label end = new Label(); Label l1 = new Label(); Label l2 = new Label(); Label l3 = new Label(); mv.visitIntInsn(ILOAD, 0); mv.visitJumpInsn(IFEQ, l1); mv.visitIntInsn(ILOAD, 2); mv.visitJumpInsn(IFEQ, l3); mv.visitInsn(ICONST_4); mv.visitJumpInsn(GOTO, l2); mv.visitLabel(l3); mv.visitInsn(ICONST_5); mv.visitJumpInsn(GOTO, l2); mv.visitLabel(l1); mv.visitInsn(ICONST_3); mv.visitLabel(l2); mv.visitIntInsn(ISTORE, 1); mv.visitLabel(end); mv.visitInsn(RETURN); mv.visitLocalVariable("a", "Z", null, start, end, 0); mv.visitLocalVariable("i", "I", null, start, end, 1); mv.visitLocalVariable("b", "Z", null, start, end, 2); String insn = TestHelper.getAsString(builder.finish(), "test_mth"); String good = "i = a ? b ? 4 : 5 : 3;"; Assert.assertEquals(good, insn); } @Test public void testNested2() { TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZIZ)V"); MethodVisitor mv = builder.getGenerator(); Label start = new Label(); mv.visitLabel(start); Label end = new Label(); Label l1 = new Label(); Label l2 = new Label(); Label l3 = new Label(); mv.visitIntInsn(ILOAD, 0); mv.visitJumpInsn(IFEQ, l1); mv.visitInsn(ICONST_3); mv.visitJumpInsn(GOTO, l2); mv.visitLabel(l1); mv.visitIntInsn(ILOAD, 2); mv.visitJumpInsn(IFEQ, l3); mv.visitInsn(ICONST_4); mv.visitJumpInsn(GOTO, l2); mv.visitLabel(l3); mv.visitInsn(ICONST_5); mv.visitLabel(l2); mv.visitIntInsn(ISTORE, 1); mv.visitLabel(end); mv.visitInsn(RETURN); mv.visitLocalVariable("a", "Z", null, start, end, 0); mv.visitLocalVariable("i", "I", null, start, end, 1); mv.visitLocalVariable("b", "Z", null, start, end, 2); String insn = TestHelper.getAsString(builder.finish(), "test_mth"); String good = "i = a ? 3 : b ? 4 : 5;"; Assert.assertEquals(good, insn); } @Test public void testReturned() { TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZI)I"); MethodVisitor mv = builder.getGenerator(); Label start = new Label(); mv.visitLabel(start); Label end = new Label(); Label l1 = new Label(); mv.visitIntInsn(ILOAD, 0); mv.visitJumpInsn(IFEQ, l1); mv.visitIntInsn(BIPUSH, 6); mv.visitJumpInsn(GOTO, end); mv.visitLabel(l1); mv.visitInsn(ICONST_3); mv.visitLabel(end); mv.visitInsn(IRETURN); mv.visitLocalVariable("a", "Z", null, start, end, 0); mv.visitLocalVariable("i", "I", null, start, end, 1); String insn = TestHelper.getAsString(builder.finish(), "test_mth"); String good = "return a ? 6 : 3;"; Assert.assertEquals(good, insn); } }