Examples with ACONST_NULL org.objectweb.asm.Opcodes.ACONST_NULL used on opensource projects

Example 1 with ACONST_NULL

use of org.objectweb.asm.Opcodes.ACONST_NULL in project groovy by apache.

the class StaticTypesCallSiteWriter method writeListDotProperty.

private void writeListDotProperty(final Expression receiver, final String propertyName, final boolean safe) {
    // for lists, replace list.foo with:
    // def result = new ArrayList(list.size())
    // for (item in list) result.add(item.foo)
    // result
    ClassNode componentType = receiver.getNodeMetaData(StaticCompilationMetadataKeys.COMPONENT_TYPE);
    if (componentType == null) {
        componentType = OBJECT_TYPE;
    }
    CompileStack compileStack = controller.getCompileStack();
    MethodVisitor mv = controller.getMethodVisitor();
    Label exit = new Label();
    if (safe) {
        receiver.visit(controller.getAcg());
        Label doGet = new Label();
        mv.visitJumpInsn(IFNONNULL, doGet);
        controller.getOperandStack().remove(1);
        mv.visitInsn(ACONST_NULL);
        mv.visitJumpInsn(GOTO, exit);
        mv.visitLabel(doGet);
    }
    Variable tmpList = varX("tmpList", ClassHelper.make(ArrayList.class));
    int var = compileStack.defineTemporaryVariable(tmpList, false);
    Variable iterator = varX("iterator", Iterator_TYPE);
    int it = compileStack.defineTemporaryVariable(iterator, false);
    Variable nextVar = varX("next", componentType);
    final int next = compileStack.defineTemporaryVariable(nextVar, false);
    mv.visitTypeInsn(NEW, "java/util/ArrayList");
    mv.visitInsn(DUP);
    receiver.visit(controller.getAcg());
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/List", "size", "()I", true);
    controller.getOperandStack().remove(1);
    mv.visitMethodInsn(INVOKESPECIAL, "java/util/ArrayList", "<init>", "(I)V", false);
    mv.visitVarInsn(ASTORE, var);
    Label l1 = new Label();
    mv.visitLabel(l1);
    receiver.visit(controller.getAcg());
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/List", "iterator", "()Ljava/util/Iterator;", true);
    controller.getOperandStack().remove(1);
    mv.visitVarInsn(ASTORE, it);
    Label l2 = new Label();
    mv.visitLabel(l2);
    mv.visitVarInsn(ALOAD, it);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Iterator", "hasNext", "()Z", true);
    Label l3 = new Label();
    mv.visitJumpInsn(IFEQ, l3);
    mv.visitVarInsn(ALOAD, it);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Iterator", "next", "()Ljava/lang/Object;", true);
    mv.visitTypeInsn(CHECKCAST, BytecodeHelper.getClassInternalName(componentType));
    mv.visitVarInsn(ASTORE, next);
    Label l4 = new Label();
    mv.visitLabel(l4);
    mv.visitVarInsn(ALOAD, var);
    PropertyExpression pexp = propX(bytecodeX(componentType, v -> v.visitVarInsn(ALOAD, next)), propertyName);
    pexp.visit(controller.getAcg());
    controller.getOperandStack().box();
    controller.getOperandStack().remove(1);
    mv.visitMethodInsn(INVOKEINTERFACE, "java/util/List", "add", "(Ljava/lang/Object;)Z", true);
    mv.visitInsn(POP);
    Label l5 = new Label();
    mv.visitLabel(l5);
    mv.visitJumpInsn(GOTO, l2);
    mv.visitLabel(l3);
    mv.visitVarInsn(ALOAD, var);
    if (safe) {
        mv.visitLabel(exit);
    }
    controller.getOperandStack().push(ClassHelper.make(ArrayList.class));
    controller.getCompileStack().removeVar(next);
    controller.getCompileStack().removeVar(it);
    controller.getCompileStack().removeVar(var);
}

Example 2 with ACONST_NULL

use of org.objectweb.asm.Opcodes.ACONST_NULL in project groovy by apache.

the class AsmClassGenerator method visitStdMethod.

private void visitStdMethod(final MethodNode node, final boolean isConstructor, final Parameter[] parameters, final Statement code) {
    controller.getCompileStack().init(node.getVariableScope(), parameters);
    controller.getCallSiteWriter().makeSiteEntry();
    MethodVisitor mv = controller.getMethodVisitor();
    if (isConstructor && (code == null || !((ConstructorNode) node).firstStatementIsSpecialConstructorCall())) {
        boolean hasCallToSuper = false;
        if (code != null && controller.getClassNode().getOuterClass() != null) {
            // the call to super is already added so we must ensure not to add it twice
            if (code instanceof BlockStatement) {
                hasCallToSuper = ((BlockStatement) code).getStatements().stream().map(statement -> statement instanceof ExpressionStatement ? ((ExpressionStatement) statement).getExpression() : null).anyMatch(expression -> expression instanceof ConstructorCallExpression && ((ConstructorCallExpression) expression).isSuperCall());
            }
        }
        if (!hasCallToSuper) {
            if (code != null) {
                // GROOVY-9373
                controller.visitLineNumber(code.getLineNumber());
            }
            // add call to "super()"
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESPECIAL, controller.getInternalBaseClassName(), "<init>", "()V", false);
        }
    }
    if (code != null) {
        code.visit(this);
    }
    if (code == null || maybeFallsThrough(code)) {
        if (code != null) {
            // GROOVY-7647, GROOVY-9373
            controller.visitLineNumber(code.getLastLineNumber());
        }
        if (node.isVoidMethod()) {
            mv.visitInsn(RETURN);
        } else {
            ClassNode type = node.getReturnType();
            if (isPrimitiveType(type)) {
                mv.visitLdcInsn(Integer.valueOf(0));
                OperandStack operandStack = controller.getOperandStack();
                operandStack.push(ClassHelper.int_TYPE);
                operandStack.doGroovyCast(type);
                BytecodeHelper.doReturn(mv, type);
                operandStack.remove(1);
            } else {
                mv.visitInsn(ACONST_NULL);
                BytecodeHelper.doReturn(mv, type);
            }
        }
    }
    controller.getCompileStack().clear();
}