1 /*
2 * *****************************************************************************
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * * Redistributions of source code must retain the above copyright notice, this
12 * list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 *
30 * *****************************************************************************
31 *
32 * Code common to the parsers.
33 *
34 */
35
36 #include <assert.h>
37 #include <stddef.h>
38 #include <stdlib.h>
39 #include <string.h>
40
41 #include <limits.h>
42
43 #include <parse.h>
44 #include <program.h>
45 #include <vm.h>
46
bc_parse_updateFunc(BcParse * p,size_t fidx)47 void bc_parse_updateFunc(BcParse *p, size_t fidx) {
48 p->fidx = fidx;
49 p->func = bc_vec_item(&p->prog->fns, fidx);
50 }
51
bc_parse_pushName(const BcParse * p,char * name,bool var)52 inline void bc_parse_pushName(const BcParse *p, char *name, bool var) {
53 bc_parse_pushIndex(p, bc_program_search(p->prog, name, var));
54 }
55
bc_parse_update(BcParse * p,uchar inst,size_t idx)56 static void bc_parse_update(BcParse *p, uchar inst, size_t idx) {
57 bc_parse_updateFunc(p, p->fidx);
58 bc_parse_push(p, inst);
59 bc_parse_pushIndex(p, idx);
60 }
61
bc_parse_addString(BcParse * p)62 void bc_parse_addString(BcParse *p) {
63
64 BcVec *strs = BC_IS_BC ? &p->func->strs : p->prog->strs;
65 size_t idx;
66
67 BC_SIG_LOCK;
68
69 if (BC_IS_BC) {
70 const char *str = bc_vm_strdup(p->l.str.v);
71 idx = strs->len;
72 bc_vec_push(strs, &str);
73 }
74 #if DC_ENABLED
75 else idx = bc_program_insertFunc(p->prog, p->l.str.v) - BC_PROG_REQ_FUNCS;
76 #endif // DC_ENABLED
77
78 bc_parse_update(p, BC_INST_STR, idx);
79
80 BC_SIG_UNLOCK;
81 }
82
bc_parse_addNum(BcParse * p,const char * string)83 static void bc_parse_addNum(BcParse *p, const char *string) {
84
85 BcVec *consts = &p->func->consts;
86 size_t idx;
87 BcConst c;
88
89 if (bc_parse_zero[0] == string[0] && bc_parse_zero[1] == string[1]) {
90 bc_parse_push(p, BC_INST_ZERO);
91 return;
92 }
93 if (bc_parse_one[0] == string[0] && bc_parse_one[1] == string[1]) {
94 bc_parse_push(p, BC_INST_ONE);
95 return;
96 }
97
98 idx = consts->len;
99
100 BC_SIG_LOCK;
101
102 c.val = bc_vm_strdup(string);
103 c.base = BC_NUM_BIGDIG_MAX;
104
105 bc_num_clear(&c.num);
106 bc_vec_push(consts, &c);
107
108 bc_parse_update(p, BC_INST_NUM, idx);
109
110 BC_SIG_UNLOCK;
111 }
112
bc_parse_number(BcParse * p)113 void bc_parse_number(BcParse *p) {
114
115 #if BC_ENABLE_EXTRA_MATH
116 char *exp = strchr(p->l.str.v, 'e');
117 size_t idx = SIZE_MAX;
118
119 if (exp != NULL) {
120 idx = ((size_t) (exp - p->l.str.v));
121 *exp = 0;
122 }
123 #endif // BC_ENABLE_EXTRA_MATH
124
125 bc_parse_addNum(p, p->l.str.v);
126
127 #if BC_ENABLE_EXTRA_MATH
128 if (exp != NULL) {
129
130 bool neg;
131
132 neg = (*((char*) bc_vec_item(&p->l.str, idx + 1)) == BC_LEX_NEG_CHAR);
133
134 bc_parse_addNum(p, bc_vec_item(&p->l.str, idx + 1 + neg));
135 bc_parse_push(p, BC_INST_LSHIFT + neg);
136 }
137 #endif // BC_ENABLE_EXTRA_MATH
138 }
139
bc_parse_text(BcParse * p,const char * text)140 void bc_parse_text(BcParse *p, const char *text) {
141 // Make sure the pointer isn't invalidated.
142 p->func = bc_vec_item(&p->prog->fns, p->fidx);
143 bc_lex_text(&p->l, text);
144 }
145
bc_parse_reset(BcParse * p)146 void bc_parse_reset(BcParse *p) {
147
148 BC_SIG_ASSERT_LOCKED;
149
150 if (p->fidx != BC_PROG_MAIN) {
151 bc_func_reset(p->func);
152 bc_parse_updateFunc(p, BC_PROG_MAIN);
153 }
154
155 p->l.i = p->l.len;
156 p->l.t = BC_LEX_EOF;
157 p->auto_part = false;
158
159 #if BC_ENABLED
160 if (BC_IS_BC) {
161 bc_vec_npop(&p->flags, p->flags.len - 1);
162 bc_vec_popAll(&p->exits);
163 bc_vec_popAll(&p->conds);
164 bc_vec_popAll(&p->ops);
165 }
166 #endif // BC_ENABLED
167
168 bc_program_reset(p->prog);
169
170 if (BC_ERR(vm.status)) BC_VM_JMP;
171 }
172
bc_parse_free(BcParse * p)173 void bc_parse_free(BcParse *p) {
174
175 BC_SIG_ASSERT_LOCKED;
176
177 assert(p != NULL);
178
179 #if BC_ENABLED
180 if (BC_IS_BC) {
181 bc_vec_free(&p->flags);
182 bc_vec_free(&p->exits);
183 bc_vec_free(&p->conds);
184 bc_vec_free(&p->ops);
185 bc_vec_free(&p->buf);
186 }
187 #endif // BC_ENABLED
188
189 bc_lex_free(&p->l);
190 }
191
bc_parse_init(BcParse * p,BcProgram * prog,size_t func)192 void bc_parse_init(BcParse *p, BcProgram *prog, size_t func) {
193
194 #if BC_ENABLED
195 uint16_t flag = 0;
196 #endif // BC_ENABLED
197
198 BC_SIG_ASSERT_LOCKED;
199
200 assert(p != NULL && prog != NULL);
201
202 #if BC_ENABLED
203 if (BC_IS_BC) {
204 bc_vec_init(&p->flags, sizeof(uint16_t), NULL);
205 bc_vec_push(&p->flags, &flag);
206 bc_vec_init(&p->exits, sizeof(BcInstPtr), NULL);
207 bc_vec_init(&p->conds, sizeof(size_t), NULL);
208 bc_vec_init(&p->ops, sizeof(BcLexType), NULL);
209 bc_vec_init(&p->buf, sizeof(char), NULL);
210 }
211 #endif // BC_ENABLED
212
213 bc_lex_init(&p->l);
214
215 p->prog = prog;
216 p->auto_part = false;
217 bc_parse_updateFunc(p, func);
218 }
219