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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
#include "scope.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define DEFAULT_SIZE 16
static void scope_init(struct scope* scope) {
scope->types = calloc(DEFAULT_SIZE, sizeof(struct type_def*));
scope->type_cap = DEFAULT_SIZE;
scope->vars = calloc(DEFAULT_SIZE, sizeof(struct var_def*));
scope->var_cap = DEFAULT_SIZE;
}
static void scope_destroy(struct scope* scope) {
for (unsigned long long i = 0; i < scope->type_cap; i++) {
if (scope->types[i] != NULL) free(scope->types[i]);
}
free(scope->types);
for (unsigned long long i = 0; i < scope->var_cap; i++) {
if (scope->vars[i] != NULL) free(scope->vars[i]);
}
free(scope->vars);
}
unsigned long long hash_name(const char* name) {
unsigned long long hash = 0, i = 0;
while (name[i] != 0) hash = (hash << 5) - hash + name[i++];
return hash;
}
static struct type_def** type_cell(
const struct scope* scope,
const char* name
) {
unsigned long long orig_idx = hash_name(name) % scope->type_cap;
unsigned long long idx = orig_idx;
do {
if (scope->types[idx] == NULL
|| strcmp(name, scope->types[idx]->name) == 0)
return &scope->types[idx];
} while ((idx = (idx + 1) % scope->type_cap) != orig_idx);
/* TODO: rehashing :'( */
fprintf(stderr, "ccc: would have to rehash and I don't wanna\n");
exit(1);
}
static struct var_def** var_cell(
const struct scope* scope,
const char* name
) {
unsigned long long orig_idx = hash_name(name) % scope->var_cap;
unsigned long long idx = orig_idx;
do {
if (scope->vars[idx] == NULL
|| strcmp(name, scope->vars[idx]->name) == 0)
return &scope->vars[idx];
} while ((idx = (idx + 1) % scope->var_cap) != orig_idx);
/* TODO: rehashing :'( */
fprintf(stderr, "ccc: would have to rehash and I don't wanna\n");
exit(1);
}
void scope_push(struct scope** p_scope) {
struct scope* inner_scope = calloc(1, sizeof(struct scope));
scope_init(inner_scope);
inner_scope->next_out = *p_scope;
*p_scope = inner_scope;
}
void scope_pop(struct scope** p_scope) {
struct scope* discarded_scope = *p_scope;
*p_scope = (*p_scope)->next_out;
scope_destroy(discarded_scope);
free(discarded_scope);
}
void scope_install_default_types(struct scope* scope) {
scope_define_type(scope, (struct type_def) {
.name = "void",
.size = 0,
});
scope_define_type(scope, (struct type_def) {
.name = "bool",
.size = 1,
});
scope_define_type(scope, (struct type_def) {
.name = "char",
.size = 1,
});
scope_define_type(scope, (struct type_def) {
.name = "short",
.size = 2,
});
scope_define_type(scope, (struct type_def) {
.name = "int",
.size = 4,
});
scope_define_type(scope, (struct type_def) {
.name = "float",
.size = 4,
});
scope_define_type(scope, (struct type_def) {
.name = "long",
.size = 8,
});
scope_define_type(scope, (struct type_def) {
.name = "double",
.size = 8,
});
}
bool scope_get_type(
const struct scope* scope,
struct type_def* p_entry,
const char* name
) {
for (; scope != NULL; scope = scope->next_out) {
struct type_def* type_def = *type_cell(scope, name);
if (type_def == NULL) continue;
if (p_entry != NULL) *p_entry = *type_def;
return true;
}
return false;
}
void scope_define_type(struct scope* scope, struct type_def type) {
struct type_def** cell = type_cell(scope, type.name);
if (*cell != NULL) {
fprintf(stderr, "ccc: error: redefined type %s\n", type.name);
exit(1);
}
*cell = calloc(1, sizeof(struct type_def));
if (*cell == NULL) {
fprintf(stderr, "ccc: out of memory\n");
exit(1);
}
**cell = type;
}
bool scope_get_var(
const struct scope* scope,
struct var_def* p_entry,
const char* name
) {
for (; scope != NULL; scope = scope->next_out) {
struct var_def* var_def = *var_cell(scope, name);
if (var_def == NULL) continue;
if (p_entry != NULL) *p_entry = *var_def;
return true;
}
return false;
}
void scope_define_var(struct scope* scope, struct var_def var) {
struct var_def** cell = var_cell(scope, var.name);
if (*cell == NULL) {
*cell = calloc(1, sizeof(struct var_def));
if (*cell == NULL) {
fprintf(stderr, "ccc: out of memory\n");
exit(1);
}
}
/* technically C allows redefinition :/ */
**cell = var;
}
|
