org.objectweb.asm.MethodVisitor#visitLabel

Source File: UserlibCollisionTest.java From AVM with MIT License

6 votes

private static byte[] getAvmPackageClassBytes() {

        ClassWriter classWriter = new ClassWriter(0);
        MethodVisitor methodVisitor;

        classWriter.visit(V10, ACC_PUBLIC | ACC_SUPER, "avm/Main", null, "java/lang/Object", null);

        classWriter.visitSource("Main.java", null);
        {
            methodVisitor = classWriter.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
            methodVisitor.visitCode();
            Label label0 = new Label();
            methodVisitor.visitLabel(label0);
            methodVisitor.visitLineNumber(3, label0);
            methodVisitor.visitVarInsn(ALOAD, 0);
            methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
            methodVisitor.visitInsn(RETURN);
            methodVisitor.visitMaxs(1, 1);
            methodVisitor.visitEnd();
        }
        classWriter.visitEnd();

        return classWriter.toByteArray();
    }

Source File: BooleanCompareExpression.java From yql-plus with Apache License 2.0

6 votes

@Override
public void generate(CodeEmitter code) {
    code.exec(new CompareExpression(loc, leftExpr, rightExpr));
    MethodVisitor mv = code.getMethodVisitor();
    Label isTrue = new Label();
    Label done = new Label();
    switch (booleanComparison) {
        case LT:
            mv.visitJumpInsn(Opcodes.IFLT, isTrue);
            break;
        case LTEQ:
            mv.visitJumpInsn(Opcodes.IFLE, isTrue);
            break;
        case GT:
            mv.visitJumpInsn(Opcodes.IFGT, isTrue);
            break;
        case GTEQ:
            mv.visitJumpInsn(Opcodes.IFGE, isTrue);
            break;
    }
    code.emitBooleanConstant(false);
    mv.visitJumpInsn(Opcodes.GOTO, done);
    mv.visitLabel(isTrue);
    code.emitBooleanConstant(true);
    mv.visitLabel(done);
}

Source File: WhileTests.java From Despector with MIT License

6 votes

@Test
public void testWhileInverse() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(I)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.visitJumpInsn(GOTO, l2);
    mv.visitLabel(l1);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitLabel(l2);
    mv.visitVarInsn(ILOAD, 0);
    mv.visitInsn(ICONST_5);
    mv.visitJumpInsn(IF_ICMPLT, l1);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("i", "I", null, start, end, 0);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "while (i < 5) {\n"
            + "    org.spongepowered.test.decompile.WhileTests.body();\n"
            + "}";
    Assert.assertEquals(good, insn);
}

Source File: Globalizer.java From Concurnas with MIT License

6 votes

private static void addstaticFinalVars(MethodVisitor mv, ArrayList<FieldVisitorHolder> staticFinalVars, String putTo) {
	for(FieldVisitorHolder sfv : staticFinalVars) {
		mv.visitLabel(new Label());
		mv.visitVarInsn(ALOAD, 0);
		
		switch(sfv.desc) {
			case "Ljava/lang/String;": mv.visitLdcInsn(sfv.value.toString()); break;
			case "J": BytecodeGenUtils.longOpcode(mv, ((Long)sfv.value).longValue() ); break;
			case "F": BytecodeGenUtils.floatOpcode(mv, ((Float)sfv.value).floatValue() ); break;
			case "D": BytecodeGenUtils.doubleOpcode(mv, ((Double)sfv.value).doubleValue() ); break;
			default: BytecodeGenUtils.intOpcode(mv, ((Integer)sfv.value).intValue() );
		}	
		
		mv.visitFieldInsn(PUTFIELD, putTo, sfv.name, sfv.desc);
	}
}

Source File: OperatorTests.java From Despector with MIT License

6 votes

@Test
public void testTypeConstant() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(I)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);
    Label end = new Label();
    mv.visitLdcInsn(Type.getType("Ljava/lang/String;"));
    mv.visitIntInsn(ASTORE, 0);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("i", "Ljava/lang/Class;", null, start, end, 0);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "i = String.class;";
    Assert.assertEquals(good, insn);
}

Source File: AdviceGenerator.java From glowroot with Apache License 2.0

6 votes

private void addOnThrowMethod(ClassWriter cw) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "onThrow",
            "(Ljava/lang/Throwable;Lorg/glowroot/agent/plugin/api/TraceEntry;)V", null, null);
    visitAnnotation(mv, "Lorg/glowroot/agent/plugin/api/weaving/OnThrow;");
    checkNotNull(mv.visitParameterAnnotation(0,
            "Lorg/glowroot/agent/plugin/api/weaving/BindThrowable;", true)).visitEnd();
    checkNotNull(mv.visitParameterAnnotation(1,
            "Lorg/glowroot/agent/plugin/api/weaving/BindTraveler;", true)).visitEnd();
    mv.visitCode();
    if (!config.traceEntryEnabledProperty().isEmpty()) {
        mv.visitVarInsn(ALOAD, 1);
        Label l0 = new Label();
        mv.visitJumpInsn(IFNONNULL, l0);
        mv.visitInsn(RETURN);
        mv.visitLabel(l0);
    }
    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKEINTERFACE, "org/glowroot/agent/plugin/api/TraceEntry",
            "endWithError", "(Ljava/lang/Throwable;)V", true);
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

Source File: IfTests.java From Despector with MIT License

6 votes

@Test
public void testElse() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(Z)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);
    Label end = new Label();
    Label else_ = new Label();
    mv.visitVarInsn(ILOAD, 0);
    mv.visitJumpInsn(IFEQ, else_);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitJumpInsn(GOTO, end);
    mv.visitLabel(else_);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("a", "Z", null, start, end, 0);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "if (a) {\n"
            + "    org.spongepowered.test.decompile.IfTests.body();\n"
            + "} else {\n"
            + "    org.spongepowered.test.decompile.IfTests.body();\n"
            + "}";
    Assert.assertEquals(good, insn);
}

Source File: BasicTests.java From Despector with MIT License

6 votes

@Test
public void testNoVoidReturnDeclared() {
    TestMethodBuilder builder = new TestMethodBuilder("main", "()V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);
    Label end = new Label();
    mv.visitLdcInsn("Hello");
    mv.visitVarInsn(ASTORE, 1);
    mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", true);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);

    String insn = KotlinTestHelper.getMethodAsString(builder.finish(), "main");
    String good = "fun main() {\n"
            + "    val param1: String = \"Hello\"\n"
            + "    println(param1)\n"
            + "}";
    Assert.assertEquals(good, insn);
}

Source File: TernaryTests.java From Despector with MIT License

5 votes

@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);
}

Source File: IfTests.java From Despector with MIT License

5 votes

@Test
public void testElif() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZZ)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);
    Label end = new Label();
    Label else_ = new Label();
    Label else2 = new Label();
    mv.visitVarInsn(ILOAD, 0);
    mv.visitJumpInsn(IFEQ, else_);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitJumpInsn(GOTO, end);
    mv.visitLabel(else_);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitJumpInsn(IFEQ, else2);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitJumpInsn(GOTO, end);
    mv.visitLabel(else2);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("a", "Z", null, start, end, 0);
    mv.visitLocalVariable("b", "Z", null, start, end, 1);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "if (a) {\n"
            + "    org.spongepowered.test.decompile.IfTests.body();\n"
            + "} else if (b) {\n"
            + "    org.spongepowered.test.decompile.IfTests.body();\n"
            + "} else {\n"
            + "    org.spongepowered.test.decompile.IfTests.body();\n"
            + "}";
    Assert.assertEquals(good, insn);
}

Source File: LineNumbersTest.java From JAADAS with GNU General Public License v3.0

5 votes

@Override
protected void generate(TraceClassVisitor cw) {
	MethodVisitor mv;

	cw.visit(V1_1, ACC_PUBLIC + ACC_SUPER, "soot/asm/backend/targets/LineNumbers",
			null, "java/lang/Object", null);
	cw.visitSource("LineNumbers.java", null);
	
	{
	mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
	mv.visitCode();
	Label l1 = new Label();
	mv.visitLabel(l1);
	mv.visitLineNumber(3, l1);
	mv.visitVarInsn(ALOAD, 0);
	Label l2 = new Label();
	mv.visitLabel(l2);
	mv.visitLineNumber(3, l2);
	mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
	Label l3 = new Label();
	mv.visitLabel(l3);
	mv.visitLineNumber(3, l3);
	mv.visitInsn(RETURN);
	mv.visitMaxs(0, 0);
	mv.visitEnd();
	}
	{
	mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
	mv.visitCode();
	Label l0 = new Label();
	mv.visitLabel(l0);
	mv.visitLineNumber(6, l0);
	mv.visitInsn(RETURN);
	mv.visitMaxs(0, 0);
	mv.visitEnd();
	}
	cw.visitEnd();

}

Source File: IfTests.java From Despector with MIT License

5 votes

@Test
public void testNestedInstanceOf() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZLjava/lang/Object;)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);
    Label end = new Label();
    Label l1 = new Label();
    mv.visitVarInsn(ILOAD, 0);
    mv.visitJumpInsn(IFEQ, end);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitTypeInsn(INSTANCEOF, THIS_TYPE.getInternalName());
    mv.visitJumpInsn(IFEQ, l1);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitLabel(l1);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("a", "Z", null, start, end, 0);
    mv.visitLocalVariable("b", "Ljava/lang/Object;", null, start, end, 1);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "if (a) {\n"
            + "    org.spongepowered.test.decompile.IfTests.body();\n"
            + "    if (b instanceof org.spongepowered.test.decompile.IfTests) {\n"
            + "        org.spongepowered.test.decompile.IfTests.body();\n"
            + "    }\n"
            + "}";
    Assert.assertEquals(good, insn);
}

Source File: IfTests.java From Despector with MIT License

5 votes

@Test
public void testNestedIf2Optimized() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZZ)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);
    Label end = new Label();
    Label else_ = new Label();
    mv.visitVarInsn(ILOAD, 0);
    mv.visitJumpInsn(IFEQ, else_);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitJumpInsn(IFEQ, end);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitJumpInsn(GOTO, end);
    mv.visitLabel(else_);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("a", "Z", null, start, end, 0);
    mv.visitLocalVariable("b", "Z", null, start, end, 1);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "if (a) {\n"
            + "    if (b) {\n"
            + "        org.spongepowered.test.decompile.IfTests.body();\n"
            + "    }\n"
            + "} else {\n"
            + "    org.spongepowered.test.decompile.IfTests.body();\n"
            + "}";
    Assert.assertEquals(good, insn);
}

Source File: LoopingExceptionStrippingVisitorTest.java From AVM with MIT License

5 votes

@Test
public void testBackwardFinally() throws Exception {
    String testClassName = "TestClass";
    ClassWriter writer = new ClassWriter(0);
    TryCatchCountingVisitor counter = new TryCatchCountingVisitor(writer);
    LoopingExceptionStrippingVisitor visitor = new LoopingExceptionStrippingVisitor();
    visitor.setDelegate(counter);
    visitor.visit(Opcodes.V10, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, testClassName, null, "java/lang/Object", null);
    
    // Create our labels.
    Label methodStart = new Label();
    Label start = new Label();
    Label end = new Label();
    Label handler = new Label();
    String type = null;
    
    // Write a target method.
    MethodVisitor methodVisitor = visitor.visitMethod(Opcodes.ACC_STATIC, "targetMethod", "()V", null, null);
    methodVisitor.visitCode();
    methodVisitor.visitJumpInsn(Opcodes.GOTO, methodStart);
    methodVisitor.visitLabel(handler);
    methodVisitor.visitInsn(Opcodes.POP);
    methodVisitor.visitInsn(Opcodes.RETURN);
    methodVisitor.visitLabel(methodStart);
    methodVisitor.visitInsn(Opcodes.ACONST_NULL);
    methodVisitor.visitInsn(Opcodes.POP);
    methodVisitor.visitLabel(start);
    methodVisitor.visitInsn(Opcodes.ACONST_NULL);
    methodVisitor.visitInsn(Opcodes.POP);
    methodVisitor.visitInsn(Opcodes.RETURN);
    methodVisitor.visitLabel(end);
    methodVisitor.visitTryCatchBlock(start, end, handler, type);
    methodVisitor.visitMaxs(1, 0);
    methodVisitor.visitEnd();
    
    // Finish.
    visitor.visitEnd();
    
    Assert.assertEquals(0, counter.counter);
}

Source File: IfTests.java From Despector with MIT License

5 votes

@Test
public void testMultipleAnd() {
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZZZ)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);
    Label ret = new Label();
    Label body = new Label();
    mv.visitVarInsn(ILOAD, 0);
    mv.visitJumpInsn(IFEQ, ret);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitJumpInsn(IFEQ, ret);
    mv.visitVarInsn(ILOAD, 2);
    mv.visitJumpInsn(IFEQ, ret);
    mv.visitLabel(body);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitLabel(ret);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("a", "Z", null, start, ret, 0);
    mv.visitLocalVariable("b", "Z", null, start, ret, 1);
    mv.visitLocalVariable("c", "Z", null, start, ret, 2);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "if (a && b && c) {\n"
            + "    org.spongepowered.test.decompile.IfTests.body();\n"
            + "}";
    Assert.assertEquals(good, insn);
}

Source File: WhileTests.java From Despector with MIT License

5 votes

@Test
public void testWhileDirectBreak() {
    // if the break is the only thing in a condition it will sometimes be
    // optimized so that the inverse of the condition targets the outside of
    // the loop rather than having a goto inside the condition
    TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(IZ)V");
    MethodVisitor mv = builder.getGenerator();
    Label start = new Label();
    mv.visitLabel(start);
    Label end = new Label();
    Label l1 = new Label();
    mv.visitLabel(l1);
    mv.visitVarInsn(ILOAD, 0);
    mv.visitInsn(ICONST_5);
    mv.visitJumpInsn(IF_ICMPGE, end);
    mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
    mv.visitVarInsn(ILOAD, 1);
    mv.visitJumpInsn(IFNE, end);
    mv.visitJumpInsn(GOTO, l1);
    mv.visitLabel(end);
    mv.visitInsn(RETURN);
    mv.visitLocalVariable("i", "I", null, start, end, 0);
    mv.visitLocalVariable("a", "Z", null, start, end, 1);

    String insn = TestHelper.getAsString(builder.finish(), "test_mth");
    String good = "while (i < 5) {\n"
            + "    org.spongepowered.test.decompile.WhileTests.body();\n"
            + "    if (a) {\n"
            + "        break;\n"
            + "    }\n"
            + "}";
    Assert.assertEquals(good, insn);
}

Source File: CompareExpression.java From yql-plus with Apache License 2.0

4 votes

@Override
public void generate(CodeEmitter code) {
    // a bit of a hack; should not need to go to dynamic invocation for this unless one arg is ANY
    Label done = new Label();
    MethodVisitor mv = code.getMethodVisitor();
    Label leftNull = new Label();
    Label rightNull = new Label();
    Label bothNull = new Label();
    CodeEmitter.Unification unified = code.unifiedEmit(leftExpr, rightExpr, leftNull, rightNull, bothNull);
    if (unified.type.isPrimitive()) {
        emitPrimitiveCompare(code, unified.type);
    } else {
        // TODO: statically determine if the unified type is Comparable -- for now treat them all like "any"
        CodeEmitter scope = code.createScope();
        MethodVisitor mv2 = scope.getMethodVisitor();
        AssignableValue right = scope.allocate(unified.type);
        AssignableValue left = scope.allocate(unified.type);
        scope.exec(right.write(unified.type));
        scope.exec(left.write(unified.type));
        scope.exec(left.read());
        Label leftIsNotComparable = new Label();
        scope.emitInstanceCheck(unified.type, Comparable.class, leftIsNotComparable);
        scope.exec(right.read());
        mv2.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(Comparable.class), "compareTo",
                Type.getMethodDescriptor(Type.INT_TYPE, Type.getType(Object.class)), true);
        scope.gotoExitScope();
        mv2.visitLabel(leftIsNotComparable);
        scope.exec(scope.getLocal("$program").read());
        scope.exec(left.read());
        scope.emitIntConstant((loc != null) ? loc.getLineNumber() : -1);
        scope.emitIntConstant((loc != null) ? loc.getCharacterOffset() : 0);
        mv2.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(ProgramInvocation.class), "notComparable", Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(Object.class), Type.INT_TYPE, Type.INT_TYPE), false);
        // this bit is not reachable, notComparable throws
        mv2.visitInsn(Opcodes.ICONST_0);
        mv2.visitJumpInsn(Opcodes.GOTO, done);
        scope.endScope();
    }
    if (unified.nullPossible) {
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(leftNull);
        mv.visitInsn(Opcodes.ICONST_M1);
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(rightNull);
        mv.visitInsn(Opcodes.ICONST_1);
        mv.visitJumpInsn(Opcodes.GOTO, done);
        mv.visitLabel(bothNull);
        mv.visitInsn(Opcodes.ICONST_0);
    }
    mv.visitLabel(done);
}

Source File: BooleanExpressionTransformer.java From groovy with Apache License 2.0

4 votes

@Override
public void visit(final GroovyCodeVisitor visitor) {
    if (visitor instanceof AsmClassGenerator) {
        AsmClassGenerator acg = (AsmClassGenerator) visitor;
        WriterController controller = acg.getController();
        OperandStack os = controller.getOperandStack();

        if (type.equals(ClassHelper.boolean_TYPE)) {
            expression.visit(visitor);
            os.doGroovyCast(ClassHelper.boolean_TYPE);
            return;
        }
        if (type.equals(ClassHelper.Boolean_TYPE)) {
            MethodVisitor mv = controller.getMethodVisitor();
            expression.visit(visitor);
            Label unbox = new Label();
            Label exit = new Label();
            // check for null
            mv.visitInsn(DUP);
            mv.visitJumpInsn(IFNONNULL, unbox);
            mv.visitInsn(POP);
            mv.visitInsn(ICONST_0);
            mv.visitJumpInsn(GOTO, exit);
            mv.visitLabel(unbox);
            // unbox
            // GROOVY-6270
            if (!os.getTopOperand().equals(type)) BytecodeHelper.doCast(mv, type);
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z", false);
            mv.visitLabel(exit);
            os.replace(ClassHelper.boolean_TYPE);
            return;
        }
        ClassNode top = type;
        if (ClassHelper.isPrimitiveType(top)) {
            expression.visit(visitor);
            // in case of null safe invocation, it is possible that what was supposed to be a primitive type
            // becomes the "null" constant, so we need to recheck
            top = controller.getOperandStack().getTopOperand();
            if (ClassHelper.isPrimitiveType(top)) {
                BytecodeHelper.convertPrimitiveToBoolean(controller.getMethodVisitor(), top);
                controller.getOperandStack().replace(ClassHelper.boolean_TYPE);
                return;
            }
        }
        List<MethodNode> asBoolean = findDGMMethodsByNameAndArguments(controller.getSourceUnit().getClassLoader(), top, "asBoolean", ClassNode.EMPTY_ARRAY);
        if (asBoolean.size() == 1) {
            MethodNode node = asBoolean.get(0);
            if (node instanceof ExtensionMethodNode) {
                MethodNode dgmNode = ((ExtensionMethodNode) node).getExtensionMethodNode();
                ClassNode owner = dgmNode.getParameters()[0].getType();
                if (ClassHelper.OBJECT_TYPE.equals(owner)) {
                    // we may inline a var!=null check instead of calling a helper method iff
                    // (1) the class doesn't define an asBoolean method (already tested)
                    // (2) no subclass defines an asBoolean method
                    // For (2), we check that we are in one of those cases
                    // (a) a final class
                    // (b) a private inner class without subclass
                    if (Modifier.isFinal(top.getModifiers())
                            || (top instanceof InnerClassNode
                            && Modifier.isPrivate(top.getModifiers())
                            && !isExtended(top, top.getOuterClass().getInnerClasses()))
                            ) {
                        CompareToNullExpression expr = new CompareToNullExpression(
                                expression, false
                        );
                        expr.visit(acg);
                        return;
                    }
                }
            }
        }
        super.visit(visitor);
    } else {
        super.visit(visitor);
    }
}

Source File: PlatformProviderGenerator.java From flogger with Apache License 2.0

4 votes

private static void tryBlockForPlatform(MethodVisitor methodVisitor, String platformType) {
  methodVisitor.visitCode();

  // Generate the enveloping try/catch block:
  //
  //   try {
  //     ...
  //   } catch (NoClassDefFoundError | IllegalAccessException | InstantiationException
  //       | InvocationTargetException | NoSuchMethodException e) {
  //     ...
  //   }
  //
  // Note that the exception types need to be listed explicitly (rather than using
  // java.lang.ReflectiveOperationException) because that parent exception type isn't available
  // on Android until API level 19.
  Label startLabel = new Label();
  Label endLabel = new Label();
  Label handlerLabel = new Label();
  methodVisitor.visitTryCatchBlock(
      startLabel, endLabel, handlerLabel, "java/lang/NoClassDefFoundError");
  methodVisitor.visitTryCatchBlock(
      startLabel, endLabel, handlerLabel, "java/lang/IllegalAccessException");
  methodVisitor.visitTryCatchBlock(
      startLabel, endLabel, handlerLabel, "java/lang/InstantiationException");
  methodVisitor.visitTryCatchBlock(
      startLabel, endLabel, handlerLabel, "java/lang/reflect/InvocationTargetException");
  methodVisitor.visitTryCatchBlock(
      startLabel, endLabel, handlerLabel, "java/lang/NoSuchMethodException");
  methodVisitor.visitLabel(startLabel);

  // Generate the actual reflective constructor call inside the try block:
  //
  //   return (Platform) PlatformClass.class.getDeclaredConstructor().newInstance();
  //
  // Note that the constructor call happens reflectively to make sure that the platform class
  // isn't loaded until actually executing this instruction. That is important because an
  // earlier class load could happen outside of the try/catch block where we are explicitly
  // handling the case of the class not being present.
  methodVisitor.visitLdcInsn(Type.getType(platformType));
  methodVisitor.visitInsn(ICONST_0);
  methodVisitor.visitTypeInsn(ANEWARRAY, "java/lang/Class");
  methodVisitor.visitMethodInsn(
      INVOKEVIRTUAL,
      "java/lang/Class",
      "getDeclaredConstructor",
      "([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;",
      false);
  methodVisitor.visitInsn(ICONST_0);
  methodVisitor.visitTypeInsn(ANEWARRAY, "java/lang/Object");
  methodVisitor.visitMethodInsn(
      INVOKEVIRTUAL,
      "java/lang/reflect/Constructor",
      "newInstance",
      "([Ljava/lang/Object;)Ljava/lang/Object;",
      false);
  methodVisitor.visitTypeInsn(CHECKCAST, "com/google/common/flogger/backend/Platform");
  methodVisitor.visitLabel(endLabel);
  methodVisitor.visitInsn(ARETURN);

  // Generate the catch block of the overall try/catch. The catch block is actually just empty,
  // but Java does require the catch handler to have at least a frame in it to declare the
  // exception variable that is available within the catch block scope:
  // https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-3.html#jvms-3.12
  methodVisitor.visitLabel(handlerLabel);
  methodVisitor.visitFrame(F_SAME1, 0, null, 1, new Object[] {"java/lang/Throwable"});
  methodVisitor.visitVarInsn(ASTORE, 0);
}

Source File: LabelNode.java From JReFrameworker with MIT License

4 votes

@Override
public void accept(final MethodVisitor methodVisitor) {
  methodVisitor.visitLabel(getLabel());
}

Java Code Examples for org.objectweb.asm.MethodVisitor#visitLabel()