Ruben Ayrapetyan
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/* Copyright 2015 Samsung Electronics Co., Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mem-allocator.h"
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#ifndef ECMA_COMPRESSED_POINTERS_H
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#define ECMA_COMPRESSED_POINTERS_H
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/** \addtogroup ecma ECMA
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* @{
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*/
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/** \addtogroup compressedpointer Compressed pointer
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* @{
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*/
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/**
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* Ecma-pointer field is used to calculate ecma-value's address.
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*
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* Ecma-pointer contains value's shifted offset from common Ecma-pointers' base.
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* The offset is shifted right by MEM_ALIGNMENT_LOG.
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* Least significant MEM_ALIGNMENT_LOG bits of non-shifted offset are zeroes.
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*/
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#define ECMA_POINTER_FIELD_WIDTH MEM_COMPRESSED_POINTER_WIDTH
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/**
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* The NULL value for compressed pointers
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*/
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#define ECMA_NULL_POINTER MEM_COMPRESSED_POINTER_NULL
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/**
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* @}
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*/
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/** \addtogroup ecmacompressedpointers Helpers for operations with compressed heap pointers
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* @{
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*/
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/**
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* Get value of pointer from specified non-null compressed pointer field.
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*/
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#define ECMA_GET_NON_NULL_POINTER(type, field) \
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((type *) mem_decompress_pointer (field))
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/**
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* Get value of pointer from specified compressed pointer field.
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*/
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#define ECMA_GET_POINTER(type, field) \
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(((unlikely (field == ECMA_NULL_POINTER)) ? NULL : ECMA_GET_NON_NULL_POINTER (type, field)))
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/**
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* Set value of non-null compressed pointer field so that it will correspond
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* to specified non_compressed_pointer.
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*/
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#define ECMA_SET_NON_NULL_POINTER(field, non_compressed_pointer) \
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(field) = (mem_compress_pointer (non_compressed_pointer) & ((1u << ECMA_POINTER_FIELD_WIDTH) - 1))
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/**
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* Set value of compressed pointer field so that it will correspond
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* to specified non_compressed_pointer.
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*/
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#define ECMA_SET_POINTER(field, non_compressed_pointer) \
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do \
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{ \
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auto __temp_pointer = non_compressed_pointer; \
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non_compressed_pointer = __temp_pointer; \
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} while (0); \
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\
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(field) = (unlikely ((non_compressed_pointer) == NULL) ? ECMA_NULL_POINTER \
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: (mem_compress_pointer (non_compressed_pointer) \
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& ((1u << ECMA_POINTER_FIELD_WIDTH) - 1)))
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/**
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* @}
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* @}
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*/
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#endif /* ECMA_COMPRESSED_POINTERS_H */
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