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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     *      }
     *      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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     *          }
     *      }
     *  }
     */
    private void genBdbSetField() {
        MethodVisitor mv = cv.visitMethod
            (ACC_PUBLIC, "bdbSetField",
             "(Ljava/lang/Object;IIZLjava/lang/Object;)V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ILOAD, 3);
        Label l0 = new Label();
        mv.visitJumpInsn(IFLE, l0);
        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.visitVarInsn(ALOAD, 5);
            mv.visitMethodInsn
                (INVOKESPECIAL, className, "bdbSetField",
                 "(Ljava/lang/Object;IIZLjava/lang/Object;)V");
        }
        mv.visitInsn(RETURN);
        mv.visitLabel(l0);
        mv.visitVarInsn(ILOAD, 4);
        Label l2 = new Label();
        mv.visitJumpInsn(IFEQ, l2);
        Label l1 = new Label();
        genSetFieldSwitch(mv, secKeyFields, l1);
        mv.visitLabel(l2);
        genSetFieldSwitch(mv, nonKeyFields, l1);
        mv.visitLabel(l1);
        mv.visitInsn(RETURN);
        mv.visitMaxs(2, 6);
        mv.visitEnd();
    }

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     *      // or for an abstract class:
     *      EnhancedAccessor.registerClass(TheClassName, null);
     *  }
     */
    private void genStaticBlock() {
        MethodVisitor mv =
            cv.visitMethod(ACC_STATIC, "<clinit>", "()V", null, null);
        mv.visitCode();
        if (staticBlockMethod != null) {
            mv.visitMethodInsn
                (INVOKESTATIC, className, staticBlockMethod, "()V");
        }
        mv.visitLdcInsn(className.replace('/', '.'));
        if (isAbstract) {
            mv.visitInsn(ACONST_NULL);
        } else {
            mv.visitTypeInsn(NEW, className);
            mv.visitInsn(DUP);
            mv.visitMethodInsn(INVOKESPECIAL, className, "<init>", "()V");
        }
        mv.visitMethodInsn
            (INVOKESTATIC, "com/sleepycat/persist/impl/EnhancedAccessor",
             "registerClass",
             "(Ljava/lang/String;Lcom/sleepycat/persist/impl/Enhanced;)V");
        mv.visitInsn(RETURN);
        mv.visitMaxs(3, 0);
        mv.visitEnd();
    }

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     *      // 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();
    }

View Full Code Here

     *      // 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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