Examples of org.drools.asm.MethodVisitor

org.drools.asm.MethodVisitor
A visitor to visit a Java method. The methods of this interface must be called in the following order: [ visitAnnotationDefault ] ( visitAnnotation | visitParameterAnnotation | visitAttribute )* [ visitCode ( visitXInsn | visitLabel | visitTryCatchBlock | visitLocalVariable | visitLineNumber)* visitMaxs ] visitEnd. In addition, the visitXInsn and visitLabel methods must be called in the sequential order of the bytecode instructions of the visited code, and the visitLocalVariable and visitLineNumber methods must be called after the labels passed as arguments have been visited. @author Eric Bruneton


    protected static void buildCollectionEquals(final ClassWriter cw,
                                                final String className,
                                                final Class clazz) {


        final MethodVisitor mv = cw.visitMethod( Opcodes.ACC_PUBLIC,
                                                 "equals",
                                                 Type.getMethodDescriptor( Type.BOOLEAN_TYPE,
                                                                           new Type[]{Type.getType( Object.class )} ),
                                                 null,
                                                 null );
        // if ( this == object ) {
        Label l0 = new Label();
        mv.visitLabel( l0 );
        mv.visitVarInsn( Opcodes.ALOAD,
                         0 );
        mv.visitVarInsn( Opcodes.ALOAD,
                         1 );
        Label l1 = new Label();
        mv.visitJumpInsn( Opcodes.IF_ACMPNE,
                          l1 );
        //    return true;
        Label l2 = new Label();
        mv.visitLabel( l2 );
        mv.visitInsn( Opcodes.ICONST_1 );
        mv.visitInsn( Opcodes.IRETURN );
        // }
        mv.visitLabel( l1 );
        // return this.delegate.equals( object );
        mv.visitVarInsn( Opcodes.ALOAD,
                         0 );
        mv.visitFieldInsn( Opcodes.GETFIELD,
                           className,
                           DELEGATE_FIELD_NAME,
                           Type.getDescriptor( clazz ) );
        mv.visitVarInsn( Opcodes.ALOAD,
                         1 );
        if ( clazz.isInterface() ) {
            mv.visitMethodInsn( Opcodes.INVOKEINTERFACE,
                                Type.getInternalName( clazz ),
                                "equals",
                                Type.getMethodDescriptor( Type.BOOLEAN_TYPE,
                                                          new Type[]{Type.getType( Object.class )} ) );
        } else {
            mv.visitMethodInsn( Opcodes.INVOKEVIRTUAL,
                                Type.getInternalName( clazz ),
                                "equals",
                                Type.getMethodDescriptor( Type.BOOLEAN_TYPE,
                                                          new Type[]{Type.getType( Object.class )} ) );
        }
        mv.visitInsn( Opcodes.IRETURN );
        Label l3 = new Label();
        mv.visitLabel( l3 );
        mv.visitLocalVariable( "this",
                               "L" + className + ";",
                               null,
                               l0,
                               l3,
                               0 );
        mv.visitLocalVariable( "object",
                               Type.getDescriptor( Object.class ),
                               null,
                               l0,
                               l3,
                               1 );
        mv.visitMaxs( 0,
                      0 );
        mv.visitEnd();
    }

View Full Code Here

     */
    protected static void buildHashCode(final ClassWriter cw,
                                        final String className,
                                        final Class clazz,
                                        final Map fieldTypes) {
        MethodVisitor mv;
        // Building hashcode method
        {
            mv = cw.visitMethod( Opcodes.ACC_PUBLIC,
                                 "hashCode",
                                 Type.getMethodDescriptor( Type.INT_TYPE,
                                                           new Type[]{} ),
                                 null,
                                 null );
            mv.visitCode();


            // if( this.__hashCache == 0 ) {
            Label l0 = new Label();
            mv.visitLabel( l0 );
            mv.visitVarInsn( Opcodes.ALOAD,
                             0 );
            mv.visitFieldInsn( Opcodes.GETFIELD,
                               className,
                               HASHCACHE_FIELD_NAME,
                               Type.INT_TYPE.getDescriptor() );
            Label l1 = new Label();
            mv.visitJumpInsn( Opcodes.IFNE,
                              l1 );
            Label l2 = new Label();


            //    this.__hashCache = this.delegate.hashCode();
            mv.visitLabel( l2 );
            mv.visitVarInsn( Opcodes.ALOAD,
                             0 );
            mv.visitVarInsn( Opcodes.ALOAD,
                             0 );
            mv.visitFieldInsn( Opcodes.GETFIELD,
                               className,
                               DELEGATE_FIELD_NAME,
                               Type.getDescriptor( clazz ) );
            if ( clazz.isInterface() ) {
                mv.visitMethodInsn( Opcodes.INVOKEINTERFACE,
                                    Type.getInternalName( clazz ),
                                    "hashCode",
                                    Type.getMethodDescriptor( Type.INT_TYPE,
                                                              new Type[0] ) );
            } else {
                mv.visitMethodInsn( Opcodes.INVOKEVIRTUAL,
                                    Type.getInternalName( clazz ),
                                    "hashCode",
                                    Type.getMethodDescriptor( Type.INT_TYPE,
                                                              new Type[0] ) );
            }
            mv.visitFieldInsn( Opcodes.PUTFIELD,
                               className,
                               HASHCACHE_FIELD_NAME,
                               Type.INT_TYPE.getDescriptor() );
            // }
            mv.visitLabel( l1 );


            // return this.__hashCache;
            mv.visitVarInsn( Opcodes.ALOAD,
                             0 );
            mv.visitFieldInsn( Opcodes.GETFIELD,
                               className,
                               HASHCACHE_FIELD_NAME,
                               Type.INT_TYPE.getDescriptor() );
            mv.visitInsn( Opcodes.IRETURN );
            Label l3 = new Label();
            mv.visitLabel( l3 );
            mv.visitLocalVariable( "this",
                                   "L" + className + ";",
                                   null,
                                   l0,
                                   l3,
                                   0 );


            mv.visitMaxs( 0,
                          0 );
            mv.visitEnd();
        }
    }

View Full Code Here

    public MethodVisitor visitMethod(final int access,
                                     final String name,
                                     final String desc,
                                     final String signature,
                                     final String[] exceptions) {
        MethodVisitor mv;
        if ( name.equals( "<clinit>" ) ) {
            final int a = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC;
            final String n = this.prefix + this.counter++;
            mv = this.cv.visitMethod( a,
                                      n,

View Full Code Here

     * @param cw
     */
    private static void build3ArgConstructor(final Class superClazz,
                                             final String className,
                                             final ClassWriter cw) {
        MethodVisitor mv;
        {
            mv = cw.visitMethod( Opcodes.ACC_PUBLIC,
                                 "<init>",
                                 Type.getMethodDescriptor( Type.VOID_TYPE,
                                                           new Type[]{Type.getType( int.class ), Type.getType( Class.class ), Type.getType( ValueType.class )} ),
                                 null,
                                 null );
            mv.visitCode();
            final Label l0 = new Label();
            mv.visitLabel( l0 );
            mv.visitVarInsn( Opcodes.ALOAD,
                             0 );
            mv.visitVarInsn( Opcodes.ILOAD,
                             1 );
            mv.visitVarInsn( Opcodes.ALOAD,
                             2 );
            mv.visitVarInsn( Opcodes.ALOAD,
                             3 );
            mv.visitMethodInsn( Opcodes.INVOKESPECIAL,
                                Type.getInternalName( superClazz ),
                                "<init>",
                                Type.getMethodDescriptor( Type.VOID_TYPE,
                                                          new Type[]{Type.getType( int.class ), Type.getType( Class.class ), Type.getType( ValueType.class )} ) );
            final Label l1 = new Label();
            mv.visitLabel( l1 );
            mv.visitInsn( Opcodes.RETURN );
            final Label l2 = new Label();
            mv.visitLabel( l2 );
            mv.visitLocalVariable( "this",
                                   "L" + className + ";",
                                   null,
                                   l0,
                                   l2,
                                   0 );
            mv.visitLocalVariable( "index",
                                   Type.getDescriptor( int.class ),
                                   null,
                                   l0,
                                   l2,
                                   1 );
            mv.visitLocalVariable( "fieldType",
                                   Type.getDescriptor( Class.class ),
                                   null,
                                   l0,
                                   l2,
                                   2 );
            mv.visitLocalVariable( "valueType",
                                   Type.getDescriptor( ValueType.class ),
                                   null,
                                   l0,
                                   l2,
                                   3 );
            mv.visitMaxs( 0,
                          0 );
            mv.visitEnd();
        }
    }

View Full Code Here

                                                     new Class[]{InternalWorkingMemory.class, Object.class} );
        } catch ( final Exception e ) {
            throw new RuntimeDroolsException( "This is a bug. Please report back to JBoss Rules team.",
                                              e );
        }
        final MethodVisitor mv = cw.visitMethod( Opcodes.ACC_PUBLIC,
                                                 overridingMethod.getName(),
                                                 Type.getMethodDescriptor( overridingMethod ),
                                                 null,
                                                 null );


        mv.visitCode();


        final Label l0 = new Label();
        mv.visitLabel( l0 );
        mv.visitVarInsn( Opcodes.ALOAD,
                         2 );
        mv.visitTypeInsn( Opcodes.CHECKCAST,
                          Type.getInternalName( originalClass ) );


        if ( originalClass.isInterface() ) {
            mv.visitMethodInsn( Opcodes.INVOKEINTERFACE,
                                Type.getInternalName( originalClass ),
                                getterMethod.getName(),
                                Type.getMethodDescriptor( getterMethod ) );
        } else {
            mv.visitMethodInsn( Opcodes.INVOKEVIRTUAL,
                                Type.getInternalName( originalClass ),
                                getterMethod.getName(),
                                Type.getMethodDescriptor( getterMethod ) );
        }
        mv.visitInsn( Type.getType( fieldType ).getOpcode( Opcodes.IRETURN ) );
        final Label l1 = new Label();
        mv.visitLabel( l1 );
        mv.visitLocalVariable( "this",
                               "L" + className + ";",
                               null,
                               l0,
                               l1,
                               0 );
        mv.visitLocalVariable( "workingMemory",
                               Type.getDescriptor( InternalWorkingMemory.class ),
                               null,
                               l0,
                               l1,
                               1 );
        mv.visitLocalVariable( "object",
                               Type.getDescriptor( Object.class ),
                               null,
                               l0,
                               l1,
                               2 );
        mv.visitMaxs( 0,
                      0 );
        mv.visitEnd();
    }

View Full Code Here

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org.drools.asm.commons.StaticInitMerger

org.drools.base.ClassFieldAccessorFactory

org.drools.base.ClassFieldExtractorFactory

org.drools.base.ShadowProxyFactory

org.drools.factmodel.ClassBuilder

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