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https://github.com/Valeh2012/PersonalVotingMachine
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86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
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/*
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ugl_bc.h
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bytecode interpreter
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*/
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#ifndef _UGL_BC_H
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#define _UGL_BC_H
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#include <stdint.h>
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#define BC_STACK_SIZE 64
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#define BC_RETURN_STACK_SIZE 6
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struct bc_struct
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{
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uint8_t *code;
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uint16_t code_pos;
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uint8_t arg_stack_pointer; /* starts at 0 and grows */
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uint8_t return_stack_pointer; /* starts at 0 and grows */
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uint16_t arg_stack[BC_STACK_SIZE]; /* parameter and return value stack */
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uint16_t return_stack[BC_RETURN_STACK_SIZE]; /* return from procedure stack */
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};
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typedef struct bc_struct bc_t;
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typedef void (*bc_buildin_fn)(bc_t *bc);
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extern bc_buildin_fn bc_buildin_list[];
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/* lower 4 bit: 0, upper 4 bit + next byte --> 12 bit value */
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#define BC_CMD_LOAD_12BIT (0x00)
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/* lower 4 bit: 1, upper 4 bit + next byte --> 12 bit value */
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#define BC_CMD_CALL_BUILDIN (0x01)
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/* lower 4 bit: 2, upper 4 bit + next byte --> 12 bit value (toplevel call, return value will be removed) */
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#define BC_CMD_CALL_BUILDIN_POP_STACK (0x02)
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/* lower 4 bit: 3, upper 4 bit + next byte --> 12 bit relative adr */
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#define BC_CMD_BRANCH (0x03)
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/* lower 4 bit: 4, upper 4 bit: 0..15, pop 1..16 bytes from the arg stack */
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/* only used to remove one byte, so could be moved to different section */
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#define BC_CMD_POP_ARG_STACK (0x04)
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/* lower 4 bit: 5, upper 4 bit: 0..15, push 1..16 bytes on the arg stack */
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/* not used any more */
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#define BC_CMD_PUSH_ARG_STACK (0x05)
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/* lower 4 bit: 5, upper 4 bit: 0..15, push 1..16 arguments, then two bytes for destination adr*/
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#define BC_CMD_CALL_PROCEDURE (0x06)
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/* lower 4 bit: 15, upper 4 bit: 0 --> put 0 on stack */
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#define BC_CMD_LOAD_0 (0x0f)
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/* lower 4 bit: 15, upper 4 bit: 1 --> put 1 on stack */
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#define BC_CMD_LOAD_1 (0x1f)
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/* lower 4 bit: 15, upper 4 bit: 2 --> but 16 bit value on stack, order: high byte, low byte */
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#define BC_CMD_LOAD_16BIT (0x2f)
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/* lower 4 bit: 15, upper 4 bit: 3 */
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#define BC_CMD_RETURN_FROM_PROCEDURE (0x3f)
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/* lower 4 bit: 15, upper 4 bit: 4 --> adr are next 16 bit*/
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#define BC_CMD_JUMP_NOT_ZERO (0x4f)
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/* lower 4 bit: 15, upper 4 bit: 5 --> adr are next 16 bit*/
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#define BC_CMD_JUMP_ZERO (0x05f)
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/* lower 4 bit: 15, upper 4 bit: 6 --> adr are next 16 bit */
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//#define BC_CMD_CALL_PROCEDURE (0x06f)
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/* lower 4 bit: 15, upper 4 bit: 7 --> adr are next 16 bit, third byte are the number of arguments */
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//#define BC_CMD_POP_ARG_STACK (0x07f)
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void bc_exec(bc_t *bc, uint8_t *code, uint16_t pos);
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/*======================================================*/
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#endif
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