Examples of com.sleepycat.asm.MethodVisitor

com.sleepycat.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

     *      // or if abstract:
     *      return null;
     *  }
     */
    private void genBdbNewInstance() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbNewInstance", "()Ljava/lang/Object;", null, null);
        mv.visitCode();
        if (isAbstract) {
            mv.visitInsn(ACONST_NULL);
            mv.visitInsn(ARETURN);
            mv.visitMaxs(1, 1);
        } else {
            mv.visitTypeInsn(NEW, className);
            mv.visitInsn(DUP);
            mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "()V");
            mv.visitInsn(ARETURN);
            mv.visitMaxs(2, 1);
        }
        mv.visitEnd();
    }

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     *      // or if abstract:
     *      return null;
     *  }
     */
    private void genBdbNewArray() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbNewArray", "(I)Ljava/lang/Object;", null, null);
        mv.visitCode();
        if (isAbstract) {
            mv.visitInsn(ACONST_NULL);
            mv.visitInsn(ARETURN);
            mv.visitMaxs(1, 2);
        } else {
            mv.visitVarInsn(ILOAD, 1);
            mv.visitTypeInsn(ANEWARRAY, className);
            mv.visitInsn(ARETURN);
            mv.visitMaxs(1, 2);
            mv.visitEnd();
        }
    }

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     *      // or if no primary key but has superclass:
     *      return super.bdbIsPriKeyFieldNullOrZero();
     *  }
     */
    private void genBdbIsPriKeyFieldNullOrZero() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbIsPriKeyFieldNullOrZero", "()Z", null, null);
        mv.visitCode();
        if (priKeyField != null) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn
                (GETFIELD, className, priKeyField.name,
                 priKeyField.type.getDescriptor());
            Label l0 = new Label();
            if (isRefType(priKeyField.type)) {
                mv.visitJumpInsn(IFNONNULL, l0);
            } else {
                genBeforeCompareToZero(mv, priKeyField.type);
                mv.visitJumpInsn(IFNE, l0);
            }
            mv.visitInsn(ICONST_1);
            Label l1 = new Label();
            mv.visitJumpInsn(GOTO, l1);
            mv.visitLabel(l0);
            mv.visitInsn(ICONST_0);
            mv.visitLabel(l1);
        } else if (hasPersistentSuperclass) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn
                (INVOKESPECIAL, superclassName, "bdbIsPriKeyFieldNullOrZero",
                 "()Z");
        } else {
            mv.visitInsn(ICONST_0);
        }
        mv.visitInsn(IRETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }

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     *      // or if no primary key but has superclass:
     *      return super.bdbWritePriKeyField(output, format);
     *  }
     */
    private void genBdbWritePriKeyField() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbWritePriKeyField",
             "(Lcom/sleepycat/persist/impl/EntityOutput;" +
              "Lcom/sleepycat/persist/impl/Format;)V",
             null, null);
        mv.visitCode();
        if (priKeyField != null) {
            if (!genWriteSimpleKeyField(mv, priKeyField)) {
                /* For a non-simple type, call EntityOutput.writeKeyObject. */
                mv.visitVarInsn(ALOAD, 1);
                mv.visitVarInsn(ALOAD, 0);
                mv.visitFieldInsn
                    (GETFIELD, className, priKeyField.name,
                     priKeyField.type.getDescriptor());
                mv.visitVarInsn(ALOAD, 2);
                mv.visitMethodInsn
                    (INVOKEINTERFACE,
                     "com/sleepycat/persist/impl/EntityOutput",
                     "writeKeyObject",
                     "(Ljava/lang/Object;" +
                      "Lcom/sleepycat/persist/impl/Format;)V");
            }
        } else if (hasPersistentSuperclass) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitVarInsn(ALOAD, 2);
            mv.visitMethodInsn
                (INVOKESPECIAL, superclassName, "bdbWritePriKeyField",
                 "(Lcom/sleepycat/persist/impl/EntityOutput;" +
                  "Lcom/sleepycat/persist/impl/Format;)V");
        }
        mv.visitInsn(RETURN);
        mv.visitMaxs(3, 3);
        mv.visitEnd();
    }

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     *      // or if no primary key but has superclass:
     *      super.bdbReadPriKeyField(input, format);
     *  }
     */
    private void genBdbReadPriKeyField() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbReadPriKeyField",
             "(Lcom/sleepycat/persist/impl/EntityInput;" +
              "Lcom/sleepycat/persist/impl/Format;)V",
             null, null);
        mv.visitCode();
        if (priKeyField != null) {
            if (!genReadSimpleKeyField(mv, priKeyField)) {
                /* For a non-simple type, call EntityInput.readKeyObject. */
                mv.visitVarInsn(ALOAD, 0);
                mv.visitVarInsn(ALOAD, 1);
                mv.visitVarInsn(ALOAD, 2);
                mv.visitMethodInsn
                    (INVOKEINTERFACE, "com/sleepycat/persist/impl/EntityInput",
                     "readKeyObject",
                     "(Lcom/sleepycat/persist/impl/Format;)" +
                     "Ljava/lang/Object;");
                mv.visitTypeInsn(CHECKCAST, getTypeInstName(priKeyField.type));
                mv.visitFieldInsn
                    (PUTFIELD, className, priKeyField.name,
                     priKeyField.type.getDescriptor());
            }
        } else if (hasPersistentSuperclass) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitVarInsn(ALOAD, 2);
            mv.visitMethodInsn
                (INVOKESPECIAL, superclassName, "bdbReadPriKeyField",
                 "(Lcom/sleepycat/persist/impl/EntityInput;" +
                  "Lcom/sleepycat/persist/impl/Format;)V");
        }
        mv.visitInsn(RETURN);
        mv.visitMaxs(3, 3);
        mv.visitEnd();
    }

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     *      output.writeObject(secKeyField2, null);
     *      // etc
     *  }
     */
    private void genBdbWriteSecKeyFields() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbWriteSecKeyFields",
             "(Lcom/sleepycat/persist/impl/EntityOutput;)V", null, null);
        mv.visitCode();
        if (priKeyField != null && isRefType(priKeyField.type)) {
            genRegisterPrimaryKey(mv, false);
        }
        if (hasPersistentSuperclass) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitMethodInsn
                (INVOKESPECIAL, superclassName, "bdbWriteSecKeyFields",
                 "(Lcom/sleepycat/persist/impl/EntityOutput;)V");
        }
        for (FieldInfo field : secKeyFields) {
            genWriteField(mv, field);
        }
        mv.visitInsn(RETURN);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }

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     *          }
     *      }
     *  }
     */
    private void genBdbReadSecKeyFields() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbReadSecKeyFields",
             "(Lcom/sleepycat/persist/impl/EntityInput;III)V", null, null);
        mv.visitCode();
        if (priKeyField != null && isRefType(priKeyField.type)) {
            genRegisterPrimaryKey(mv, true);
        }
        genReadSuperKeyFields(mv, true);
        genReadFieldSwitch(mv, secKeyFields);
        mv.visitInsn(RETURN);
        mv.visitMaxs(5, 5);
        mv.visitEnd();
    }

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     *      output.writeObject(nonKeyField2, null);
     *      // etc
     *  }
     */
    private void genBdbWriteNonKeyFields() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbWriteNonKeyFields",
             "(Lcom/sleepycat/persist/impl/EntityOutput;)V", null, null);
        mv.visitCode();
        if (hasPersistentSuperclass) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitMethodInsn
                (INVOKESPECIAL, superclassName, "bdbWriteNonKeyFields",
                 "(Lcom/sleepycat/persist/impl/EntityOutput;)V");
        }
        if (isCompositeKey) {
            for (FieldInfo field : nonKeyFields) {
                genWriteSimpleKeyField(mv, field);
                /* Ignore non-simple (illegal) types for composite key. */
            }
        } else {
            for (FieldInfo field : nonKeyFields) {
                genWriteField(mv, field);
            }
        }
        mv.visitInsn(RETURN);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    }

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     *      // etc
     *      // or like bdbReadSecKeyFields if not a composite key class
     *  }
     */
    private void genBdbReadNonKeyFields() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbReadNonKeyFields",
             "(Lcom/sleepycat/persist/impl/EntityInput;III)V", null, null);
        mv.visitCode();
        if (isCompositeKey) {
            for (FieldInfo field : nonKeyFields) {
                genReadSimpleKeyField(mv, field);
                /* Ignore non-simple (illegal) types for composite key. */
            }
        } else {
            genReadSuperKeyFields(mv, false);
            genReadFieldSwitch(mv, nonKeyFields);
        }
        mv.visitInsn(RETURN);
        mv.visitMaxs(5, 5);
        mv.visitEnd();
    }

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     *      }
     *      return null;
     *  }
     */
    private void genBdbGetField() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbGetField",
             "(Ljava/lang/Object;IIZ)Ljava/lang/Object;", null, null);
        mv.visitCode();
        mv.visitVarInsn(ILOAD, 3);
        Label l0 = new Label();
        mv.visitJumpInsn(IFLE, l0);
        Label l1 = new Label();
        if (hasPersistentSuperclass) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitVarInsn(ILOAD, 2);
            mv.visitVarInsn(ILOAD, 3);
            mv.visitInsn(ICONST_1);
            mv.visitInsn(ISUB);
            mv.visitVarInsn(ILOAD, 4);
            mv.visitMethodInsn
                (INVOKESPECIAL, className, "bdbGetField",
                 "(Ljava/lang/Object;IIZ)Ljava/lang/Object;");
            mv.visitInsn(ARETURN);
        } else {
            mv.visitJumpInsn(GOTO, l1);
        }
        mv.visitLabel(l0);
        mv.visitVarInsn(ILOAD, 4);
        Label l2 = new Label();
        mv.visitJumpInsn(IFEQ, l2);
        genGetFieldSwitch(mv, secKeyFields, l1);
        mv.visitLabel(l2);
        genGetFieldSwitch(mv, nonKeyFields, l1);
        mv.visitLabel(l1);
        mv.visitInsn(ACONST_NULL);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(1, 5);
        mv.visitEnd();
    }

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