1 /* Copyright JS Foundation and other contributors, http://js.foundation 2 * 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef JRT_BIT_FIELDS_H 17 #define JRT_BIT_FIELDS_H 18 19 /** 20 * Extract a bit-field. 21 * 22 * @param type type of container 23 * @param container container to extract bit-field from 24 * @param lsb least significant bit of the value to be extracted 25 * @param width width of the bit-field to be extracted 26 * @return bit-field's value 27 */ 28 #define JRT_EXTRACT_BIT_FIELD(type, container, lsb, width) \ 29 (((container) >> lsb) & ((((type) 1) << (width)) - 1)) 30 31 /** 32 * Set a bit-field. 33 * 34 * @param type type of container 35 * @param container container to insert bit-field to 36 * @param new_bit_field_value value of bit-field to insert 37 * @param lsb least significant bit of the value to be inserted 38 * @param width width of the bit-field to be inserted 39 * @return bit-field's value 40 */ 41 #define JRT_SET_BIT_FIELD_VALUE(type, container, new_bit_field_value, lsb, width) \ 42 (((container) & ~(((((type) 1) << (width)) - 1) << (lsb))) | (((type) new_bit_field_value) << (lsb))) 43 44 #endif /* !JRT_BIT_FIELDS_H */ 45