Package org.objectweb.asm

Examples of org.objectweb.asm.MethodVisitor

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    }
   
    int access = getAccess(method);
    String desc = md.toDescriptorString();
   
    MethodVisitor mv = context.getClassWriter().visitMethod(access, method.getName(), desc, null, exceptions);
    for (IBytecodeAnnotation ba : method.getDeclaredAnnotations()) {
      this.declareAnnotation(context, ba, mv.visitAnnotation(ba.getType().getType().toDescriptorString(), true));
    }

    if (method instanceof BytecodeMethodConcrete) {
      BytecodeContextMethodASM ctx = new BytecodeContextMethodASM(mv, method, context, writer);
      ((BytecodeMethodConcrete) method).write(ctx);
    } else {
      mv.visitEnd();
    }
  }
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        // GENERATE <init>(<type> target, ScriptSource source, Integer lineNumber)

        String methodDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE,
                new Type[]{superclassType, scriptSourceType, integerType});
        MethodVisitor methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, "<init>", methodDescriptor, null,
                new String[0]);
        methodVisitor.visitCode();

        boolean noArgsConstructor;
        try {
            type.getConstructor(type);
            noArgsConstructor = false;
        } catch (NoSuchMethodException e) {
            try {
                type.getConstructor();
                noArgsConstructor = true;
            } catch (NoSuchMethodException e1) {
                throw new IllegalArgumentException(String.format(
                        "Cannot create subtype for exception '%s'. It needs a zero-args or copy constructor.",
                        type.getName()));
            }
        }

        if (noArgsConstructor) {
            // GENERATE super()
            methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
            methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassType.getInternalName(), "<init>",
                    Type.getMethodDescriptor(Type.VOID_TYPE, new Type[0]));
            // END super()
        } else {
            // GENERATE super(target)
            methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
            methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
            methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassType.getInternalName(), "<init>",
                    Type.getMethodDescriptor(Type.VOID_TYPE, new Type[]{superclassType}));
            // END super(target)
        }

        // GENERATE helper = new ExceptionHelper(this, target, source, lineNumber)
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);

        methodVisitor.visitTypeInsn(Opcodes.NEW, helperType.getInternalName());
        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 2);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 3);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, helperType.getInternalName(), "<init>",
                Type.getMethodDescriptor(Type.VOID_TYPE, new Type[]{throwableType, throwableType, scriptSourceType, integerType}));

        methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, generatedType.getInternalName(), "helper",
                helperType.getDescriptor());

        // END helper = new ExceptionHelper(target)

        methodVisitor.visitInsn(Opcodes.RETURN);
        methodVisitor.visitMaxs(0, 0);
        methodVisitor.visitEnd();

        // END <init>(<type> target, ScriptSource source, Integer lineNumber)

        for (Method method : ExceptionHelper.class.getDeclaredMethods()) {
            // GENERATE public <type> <method>() { return helper.<method>(); }
            methodDescriptor = Type.getMethodDescriptor(Type.getType(method.getReturnType()), new Type[0]);
            methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, method.getName(), methodDescriptor, null,
                    new String[0]);
            methodVisitor.visitCode();

            methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
            methodVisitor.visitFieldInsn(Opcodes.GETFIELD, generatedType.getInternalName(), "helper",
                    helperType.getDescriptor());
            methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, helperType.getInternalName(), method.getName(),
                    methodDescriptor);

            methodVisitor.visitInsn(Opcodes.ARETURN);
            methodVisitor.visitMaxs(0, 0);
            methodVisitor.visitEnd();
            // END public <type> <method>() { return helper.<method>(); }
        }

        visitor.visitEnd();
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                superclassType.getInternalName(), new String[0]);

        // Constructor

        String constructorDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[0]);
        MethodVisitor methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, "<init>", constructorDescriptor, null,
                new String[0]);
        methodVisitor.visitCode();

        // super()
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, superclassType.getInternalName(), "<init>",
                constructorDescriptor);

        methodVisitor.visitInsn(Opcodes.RETURN);
        methodVisitor.visitMaxs(0, 0);
        methodVisitor.visitEnd();

        // run() method

        String runDesciptor = Type.getMethodDescriptor(Type.getType(Object.class), new Type[0]);
        methodVisitor = visitor.visitMethod(Opcodes.ACC_PUBLIC, "run", runDesciptor, null, new String[0]);
        methodVisitor.visitCode();

        // return null
        methodVisitor.visitInsn(Opcodes.ACONST_NULL);

        methodVisitor.visitInsn(Opcodes.ARETURN);
        methodVisitor.visitMaxs(0, 0);
        methodVisitor.visitEnd();

        visitor.visitEnd();

        byte[] bytecode = visitor.toByteArray();
        return (Class<T>) ReflectionUtil.invoke(type.getClassLoader(), "defineClass", new Object[]{
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        return cw.toByteArray();
    }

    private static void genConstructor(ClassWriter cw, final String superClass) {
        MethodVisitor mv;
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitMethodInsn(Opcodes.INVOKESPECIAL, superClass, "<init>", "()V");
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
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        mv.visitEnd();
    }

    @Deprecated
    public static void genInvokeXxxWithArray(ClassWriter cw, Method method) {
        MethodVisitor mv;
        mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "invoke", "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", null, EXCEPTIONS);
        mv.visitCode();

        Class callClass = method.getDeclaringClass();
        boolean useInterface = callClass.isInterface();

        String type = BytecodeHelper.getClassInternalName(callClass.getName());
        String descriptor = BytecodeHelper.getMethodDescriptor(method.getReturnType(), method.getParameterTypes());

        // make call
        if (Modifier.isStatic(method.getModifiers())) {
            genLoadParameters(2, mv, method);
            mv.visitMethodInsn(Opcodes.INVOKESTATIC, type, method.getName(), descriptor);
        } else {
            mv.visitVarInsn(Opcodes.ALOAD, 1);
            BytecodeHelper.doCast(mv, callClass);
            genLoadParameters(2, mv, method);
            mv.visitMethodInsn((useInterface) ? Opcodes.INVOKEINTERFACE : Opcodes.INVOKEVIRTUAL, type, method.getName(), descriptor);
        }

        BytecodeHelper.box(mv, method.getReturnType());
        if (method.getReturnType() == void.class) {
            mv.visitInsn(Opcodes.ACONST_NULL);
        }

        mv.visitInsn(Opcodes.ARETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }
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        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

    private static void genInvokeWithFixedParams(ClassWriter cw, Method method) {
        MethodVisitor mv;
        final int pc = method.getParameterTypes().length;
        if (pc <= 4)
        {
            StringBuilder pdescb = new StringBuilder();
            for (int i = 0; i != pc; ++i)
              pdescb.append("Ljava/lang/Object;");

            String pdesc = pdescb.toString();

            mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "invoke", "(Ljava/lang/Object;" + pdesc + ")Ljava/lang/Object;", null, EXCEPTIONS);
            mv.visitCode();

            Class callClass = method.getDeclaringClass();
            boolean useInterface = callClass.isInterface();

            String type = BytecodeHelper.getClassInternalName(callClass.getName());
            String descriptor = BytecodeHelper.getMethodDescriptor(method.getReturnType(), method.getParameterTypes());

            // make call
             if (Modifier.isStatic(method.getModifiers())) {
                MethodHandleFactory.genLoadParametersDirect(2, mv,  method);
                mv.visitMethodInsn(Opcodes.INVOKESTATIC, type, method.getName(), descriptor);
            } else {
                mv.visitVarInsn(Opcodes.ALOAD, 1);
                BytecodeHelper.doCast(mv, callClass);
                MethodHandleFactory.genLoadParametersDirect(2, mv, method);
                mv.visitMethodInsn((useInterface) ? Opcodes.INVOKEINTERFACE : Opcodes.INVOKEVIRTUAL, type, method.getName(), descriptor);
            }

            BytecodeHelper.box(mv, method.getReturnType());
            if (method.getReturnType() == void.class) {
                mv.visitInsn(Opcodes.ACONST_NULL);
            }

            mv.visitInsn(Opcodes.ARETURN);
            mv.visitMaxs(0, 0);
            mv.visitEnd();
        }
    }
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            mv.visitEnd();
        }
    }

    private static void genInvokeWithFixedPrimitiveParams(ClassWriter cw, Method method) {
        MethodVisitor mv;
        final Class<?>[] pt = method.getParameterTypes();
        final int pc = pt.length;
        if (pc > 0 && pc <= 3)
        {
            StringBuilder pdescb = new StringBuilder();
            boolean hasPrimitive = false;
            for (int i = 0; i != pc; ++i)
              if (pt[i].isPrimitive()) {
                  hasPrimitive = true;
                  pdescb.append(BytecodeHelper.getTypeDescription(pt[i]));
              }
              else
                pdescb.append("Ljava/lang/Object;");

            if (!hasPrimitive)
              return;

            String pdesc = pdescb.toString();

            mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "invoke", "(Ljava/lang/Object;" + pdesc + ")Ljava/lang/Object;", null, EXCEPTIONS);
            mv.visitCode();

            Class callClass = method.getDeclaringClass();
            boolean useInterface = callClass.isInterface();

            String type = BytecodeHelper.getClassInternalName(callClass.getName());
            String descriptor = BytecodeHelper.getMethodDescriptor(method.getReturnType(), method.getParameterTypes());

            // make call
             if (Modifier.isStatic(method.getModifiers())) {
                MethodHandleFactory.genLoadParametersPrimitiveDirect(2, mv, method);
                mv.visitMethodInsn(Opcodes.INVOKESTATIC, type, method.getName(), descriptor);
            } else {
                mv.visitVarInsn(Opcodes.ALOAD, 1);
                BytecodeHelper.doCast(mv, callClass);
                MethodHandleFactory.genLoadParametersPrimitiveDirect(2, mv, method);
                mv.visitMethodInsn((useInterface) ? Opcodes.INVOKEINTERFACE : Opcodes.INVOKEVIRTUAL, type, method.getName(), descriptor);
            }

            BytecodeHelper.box(mv, method.getReturnType());
            if (method.getReturnType() == void.class) {
                mv.visitInsn(Opcodes.ACONST_NULL);
            }

            mv.visitInsn(Opcodes.ARETURN);
            mv.visitMaxs(0, 0);
            mv.visitEnd();
        }
    }
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    protected void writeForInLoop(ForStatement loop) {
        controller.getAcg().onLineNumber(loop,"visitForLoop");
        writeStatementLabel(loop);
       
        CompileStack compileStack = controller.getCompileStack();
        MethodVisitor mv = controller.getMethodVisitor();
        OperandStack operandStack = controller.getOperandStack();

        compileStack.pushLoop(loop.getVariableScope(), loop.getStatementLabel());

        // Declare the loop counter.
        BytecodeVariable variable = compileStack.defineVariable(loop.getVariable(), false);

        // Then get the iterator and generate the loop control
        MethodCallExpression iterator = new MethodCallExpression(loop.getCollectionExpression(), "iterator", new ArgumentListExpression());
        iterator.visit(controller.getAcg());
        operandStack.doGroovyCast(ClassHelper.Iterator_TYPE);

        final int iteratorIdx = compileStack.defineTemporaryVariable("iterator", ClassHelper.Iterator_TYPE, true);

        Label continueLabel = compileStack.getContinueLabel();
        Label breakLabel = compileStack.getBreakLabel();

        mv.visitLabel(continueLabel);
        mv.visitVarInsn(ALOAD, iteratorIdx);
        writeIteratorHasNext(mv);
        // note: ifeq tests for ==0, a boolean is 0 if it is false
        mv.visitJumpInsn(IFEQ, breakLabel);

        mv.visitVarInsn(ALOAD, iteratorIdx);
        writeIteratorNext(mv);
        operandStack.push(ClassHelper.OBJECT_TYPE);
        operandStack.storeVar(variable);

        // Generate the loop body
        loop.getLoopBlock().visit(controller.getAcg());

        mv.visitJumpInsn(GOTO, continueLabel);
        mv.visitLabel(breakLabel);

        compileStack.pop();
    }
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    protected void writeForLoopWithClosureList(ForStatement loop) {
        controller.getAcg().onLineNumber(loop,"visitForLoop");
        writeStatementLabel(loop);

        MethodVisitor mv = controller.getMethodVisitor();
        controller.getCompileStack().pushLoop(loop.getVariableScope(), loop.getStatementLabel());

        ClosureListExpression clExpr = (ClosureListExpression) loop.getCollectionExpression();
        controller.getCompileStack().pushVariableScope(clExpr.getVariableScope());

        List expressions = clExpr.getExpressions();
        int size = expressions.size();

        // middle element is condition, lower half is init, higher half is increment
        int condIndex = (size - 1) / 2;

        // visit init
        for (int i = 0; i < condIndex; i++) {
            visitExpressionOrStatement(expressions.get(i));
        }

        Label continueLabel = controller.getCompileStack().getContinueLabel();
        Label breakLabel = controller.getCompileStack().getBreakLabel();

        Label cond = new Label();
        mv.visitLabel(cond);
        // visit condition leave boolean on stack
        {
            Expression condExpr = (Expression) expressions.get(condIndex);
            int mark = controller.getOperandStack().getStackLength();
            condExpr.visit(controller.getAcg());
            controller.getOperandStack().castToBool(mark,true);
        }
        // jump if we don't want to continue
        // note: ifeq tests for ==0, a boolean is 0 if it is false
        controller.getOperandStack().jump(IFEQ, breakLabel);

        // Generate the loop body
        loop.getLoopBlock().visit(controller.getAcg());

        // visit increment
        mv.visitLabel(continueLabel);
        for (int i = condIndex + 1; i < size; i++) {
            visitExpressionOrStatement(expressions.get(i));
        }

        // jump to test the condition again
        mv.visitJumpInsn(GOTO, cond);

        // loop end
        mv.visitLabel(breakLabel);

        controller.getCompileStack().pop();
        controller.getCompileStack().pop();
    }
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    public void writeWhileLoop(WhileStatement loop) {
        controller.getAcg().onLineNumber(loop,"visitWhileLoop");
        writeStatementLabel(loop);

        MethodVisitor mv = controller.getMethodVisitor();

        controller.getCompileStack().pushLoop(loop.getStatementLabel());
        Label continueLabel = controller.getCompileStack().getContinueLabel();
        Label breakLabel = controller.getCompileStack().getBreakLabel();

        mv.visitLabel(continueLabel);
        Expression bool = loop.getBooleanExpression();
        boolean boolHandled = false;
        if (bool instanceof ConstantExpression) {
            ConstantExpression constant = (ConstantExpression) bool;
            if (constant.getValue()==Boolean.TRUE) {
                boolHandled = true;
                // do nothing
            } else if (constant.getValue()==Boolean.FALSE) {
                boolHandled = true;
                mv.visitJumpInsn(GOTO, breakLabel);
            }
        }

        if(!boolHandled) {
            bool.visit(controller.getAcg());
            controller.getOperandStack().jump(IFEQ, breakLabel);
        }

        loop.getLoopBlock().visit(controller.getAcg());

        mv.visitJumpInsn(GOTO, continueLabel);
        mv.visitLabel(breakLabel);

        controller.getCompileStack().pop();           
    }
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