108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/* Copyright (C) 2023 Aryadev Chavali
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* You may distribute and modify this code under the terms of the
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* GPLv2 license. You should have received a copy of the GPLv2
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* license with this file. If not, please write to:
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* aryadev@aryadevchavali.com.
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* Created: 2023-10-15
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* Author: Aryadev Chavali
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* Description: Instructions and opcodes
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*/
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#ifndef INST_H
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#define INST_H
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#include <stdio.h>
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#include <stdlib.h>
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#include "./base.h"
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#include "./darr.h"
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typedef enum
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{
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OP_NOOP = 0,
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// 0b0001
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OP_PUSH_BYTE = 0b00000001,
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OP_PUSH_WORD = 0b00000011,
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OP_PUSH_FLOAT = 0b00000101,
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// 0b0010
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OP_PUSH_BYTE_REGISTER = 0b00000010,
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OP_PUSH_WORD_REGISTER = 0b00000110,
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OP_PUSH_FLOAT_REGISTER = 0b00001010,
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// 0b0100
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OP_POP_BYTE = 0b00000100,
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OP_POP_WORD = 0b00001100,
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OP_POP_FLOAT = 0b00010100,
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// 0b1000
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OP_MOV_BYTE = 0b00001000,
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OP_MOV_WORD = 0b00011000,
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OP_MOV_FLOAT = 0b00101000,
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OP_HALT = 0b10000000, // top of the byte is a HALT
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} opcode_t;
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const char *opcode_as_cstr(opcode_t);
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// Masks and values to check if an opcode is of a type
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typedef enum
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{
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OP_TYPE_PUSH = 0b00000001,
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OP_TYPE_PUSH_REGISTER = 0b00000010,
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OP_TYPE_POP = 0b00000100,
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OP_TYPE_MOV = 0b00001000,
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OP_TYPE_HALT = 0b10000000,
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} opcode_type_t;
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const char *opcode_type_as_cstr(opcode_type_t);
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#define OPCODE_IS_TYPE(OPCODE, OP_TYPE) (((OPCODE) & (OP_TYPE)) == (OP_TYPE))
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typedef struct
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{
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opcode_t opcode;
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data_t operand;
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} inst_t;
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void inst_print(inst_t, FILE *);
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size_t inst_bytecode_size(inst_t);
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void inst_write_bytecode(inst_t, darr_t *);
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// Here the dynamic array is a preloaded buffer of bytes, where
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// darr.available is the number of overall bytes and used is the
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// cursor (where we are in the buffer).
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inst_t inst_read_bytecode(darr_t *);
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#define INST_BPUSH(BYTE) \
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((inst_t){.opcode = OP_PUSH_BYTE, .operand = DBYTE(BYTE)})
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#define INST_WPUSH(WORD) \
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((inst_t){.opcode = OP_PUSH_WORD, .operand = DWORD(WORD)})
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#define INST_FPUSH(FLOAT) \
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((inst_t){.opcode = OP_PUSH_FLOAT, .operand = DFLOAT(FLOAT)})
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#define INST_BMOV(REG) ((inst_t){.opcode = OP_MOV_BYTE, .operand = DBYTE(REG)})
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#define INST_WMOV(REG) ((inst_t){.opcode = OP_MOV_WORD, .operand = DBYTE(REG)})
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#define INST_FMOV(REG) ((inst_t){.opcode = OP_MOV_FLOAT, .operand = DBYTE(REG)})
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#define INST_BPOP ((inst_t){.opcode = OP_POP_BYTE})
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#define INST_WPOP ((inst_t){.opcode = OP_POP_WORD})
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#define INST_FPOP ((inst_t){.opcode = OP_POP_FLOAT})
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#define INST_BPUSH_REG(REG) \
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((inst_t){.opcode = OP_PUSH_BYTE_REGISTER, .operand = DBYTE(REG)})
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#define INST_WPUSH_REG(REG) \
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((inst_t){.opcode = OP_PUSH_WORD_REGISTER, .operand = DBYTE(REG)})
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#define INST_FPUSH_REG(REG) \
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((inst_t){.opcode = OP_PUSH_FLOAT_REGISTER, .operand = DBYTE(REG)})
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#endif
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