1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/* Copyright (c) 2024 Freya Murphy */
#ifndef __PARSE_H__
#define __PARSE_H__
#include "lex.h"
#include <mlimits.h>
#include <mips.h>
#include <stdint.h>
/* mips directive types */
enum mips_directive_type {
MIPS_DIRECTIVE_ALIGN,
MIPS_DIRECTIVE_SPACE,
MIPS_DIRECTIVE_WORD,
MIPS_DIRECTIVE_HALF,
MIPS_DIRECTIVE_BYTE,
MIPS_DIRECTIVE_SECTION,
MIPS_DIRECTIVE_EXTERN,
MIPS_DIRECTIVE_GLOBL,
MIPS_DIRECTIVE_ASCII,
MIPS_DIRECTIVE_ASCIIZ,
};
/* mip32 directive */
struct mips_directive {
enum mips_directive_type type;
uint32_t len; // used for words, halfs, bytes
union {
uint16_t align;
uint16_t space;
uint32_t words[MAX_ARG_LENGTH];
uint16_t halfs[MAX_ARG_LENGTH];
uint8_t bytes[MAX_ARG_LENGTH];
char name[MAX_ARG_LENGTH];
};
};
enum reference_type {
REF_NONE,
REF_OFFESET,
REF_TARGET,
};
struct reference {
enum reference_type type;
/// symbol name
char name[MAX_LEX_LENGTH];
/// integer addend
int64_t addend;
};
struct const_expr {
char name[MAX_LEX_LENGTH];
uint32_t value;
};
struct ins_expr {
/// pesudo instructions can return
/// more than one instruction
size_t ins_len;
struct mips_instruction ins[2];
/// instructions can reference symbols.
/// instruction `n` will be paried with reference `n`
struct reference ref[2];
};
enum expr_type {
EXPR_DIRECTIVE,
EXPR_CONSTANT,
EXPR_INS,
EXPR_LABEL,
};
struct expr {
enum expr_type type;
union {
// directive
struct mips_directive directive;
// constant
struct const_expr constant;
// instruction
struct ins_expr ins;
// label
char label[MAX_LEX_LENGTH];
};
};
struct parser {
struct lexer *lexer;
struct token peek;
};
/* get the next expression in the parser */
int parser_next(struct parser *parser, struct expr *expr);
/* initalize the base parser */
int parser_init(struct lexer *lexer, struct parser *parser);
/* free the base parser */
void parser_free(struct parser *parser);
#endif /* __PARSE_H__ */
|
