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69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/* Copyright 2014-2015 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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#ifndef BYTECODE_DATA_H
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#define BYTECODE_DATA_H
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#include "opcodes.h"
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#include "lit-id-hash-table.h"
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#include "mem-allocator.h"
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/*
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* All literals are kept in the 'literals' array.
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* Literal structure doesn't hold real string. All program-specific strings
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* are kept in the 'strings_buffer' and literal has pointer to this buffer.
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*
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* Literal id is its index in 'literals' array of bytecode_data_t structure.
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*
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* Bytecode, which is kept in the 'instrs' field, is divided into blocks
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* of 'BLOCK_SIZE' operands. Every block has its own numbering of literals.
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* Literal uid could be in range [0, 127] in every block.
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*
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* To map uid to literal id 'lit_id_hash' table is used.
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*/
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#define BLOCK_SIZE 64
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/**
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* Header of byte-code memory region, containing byte-code array and literal identifiers hash table
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*/
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typedef struct __attribute__ ((aligned (MEM_ALIGNMENT)))
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{
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mem_cpointer_t lit_id_hash_cp; /**< pointer to literal identifiers hash table
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* See also: lit_id_hash_table_init */
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mem_cpointer_t next_instrs_cp; /**< pointer to next byte-code memory region */
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vm_instr_counter_t instructions_number; /**< number of instructions in the byte-code array */
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} insts_data_header_t;
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typedef struct
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{
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const ecma_char_t *strings_buffer;
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const vm_instr_t *instrs_p;
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vm_instr_counter_t instrs_count;
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} bytecode_data_t;
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/**
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* Macros to get a pointer to bytecode header by pointer to instructions array start
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*/
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#define GET_BYTECODE_HEADER(instrs) ((insts_data_header_t *) (((uint8_t *) (instrs)) - sizeof (insts_data_header_t)))
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/**
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* Macros to get a hash table corresponding to a bytecode region
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*/
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#define GET_HASH_TABLE_FOR_BYTECODE(instrs) (MEM_CP_GET_POINTER (lit_id_hash_table, \
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GET_BYTECODE_HEADER (instrs)->lit_id_hash_cp))
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#endif // BYTECODE_DATA_H
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