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d4310edb LC |
1 | /* Scheme/Guile language support routines for GDB, the GNU debugger. |
2 | ||
3 | Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007 Free | |
4 | Software Foundation, Inc. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
d4310edb LC |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
d4310edb LC |
20 | |
21 | #include "defs.h" | |
22 | #include "symtab.h" | |
23 | #include "gdbtypes.h" | |
24 | #include "expression.h" | |
25 | #include "parser-defs.h" | |
26 | #include "language.h" | |
27 | #include "value.h" | |
28 | #include "c-lang.h" | |
29 | #include "scm-lang.h" | |
30 | #include "scm-tags.h" | |
31 | #include "source.h" | |
32 | #include "gdb_string.h" | |
33 | #include "gdbcore.h" | |
34 | #include "infcall.h" | |
35 | ||
36 | extern void _initialize_scheme_language (void); | |
37 | static struct value *evaluate_subexp_scm (struct type *, struct expression *, | |
38 | int *, enum noside); | |
39 | static struct value *scm_lookup_name (char *); | |
40 | static int in_eval_c (void); | |
41 | ||
42 | struct type *builtin_type_scm; | |
43 | ||
44 | void | |
45 | scm_printchar (int c, struct ui_file *stream) | |
46 | { | |
47 | fprintf_filtered (stream, "#\\%c", c); | |
48 | } | |
49 | ||
50 | static void | |
51 | scm_printstr (struct ui_file *stream, const gdb_byte *string, | |
52 | unsigned int length, int width, int force_ellipses) | |
53 | { | |
54 | fprintf_filtered (stream, "\"%s\"", string); | |
55 | } | |
56 | ||
57 | int | |
58 | is_scmvalue_type (struct type *type) | |
59 | { | |
60 | if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) | |
61 | { | |
62 | return 1; | |
63 | } | |
64 | return 0; | |
65 | } | |
66 | ||
67 | /* Get the INDEX'th SCM value, assuming SVALUE is the address | |
68 | of the 0'th one. */ | |
69 | ||
70 | LONGEST | |
71 | scm_get_field (LONGEST svalue, int index) | |
72 | { | |
73 | gdb_byte buffer[20]; | |
74 | read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm), | |
75 | buffer, TYPE_LENGTH (builtin_type_scm)); | |
76 | return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm)); | |
77 | } | |
78 | ||
79 | /* Unpack a value of type TYPE in buffer VALADDR as an integer | |
80 | (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), | |
81 | or Boolean (CONTEXT == TYPE_CODE_BOOL). */ | |
82 | ||
83 | LONGEST | |
84 | scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context) | |
85 | { | |
86 | if (is_scmvalue_type (type)) | |
87 | { | |
88 | LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type)); | |
89 | if (context == TYPE_CODE_BOOL) | |
90 | { | |
91 | if (svalue == SCM_BOOL_F) | |
92 | return 0; | |
93 | else | |
94 | return 1; | |
95 | } | |
96 | switch (7 & (int) svalue) | |
97 | { | |
98 | case 2: | |
99 | case 6: /* fixnum */ | |
100 | return svalue >> 2; | |
101 | case 4: /* other immediate value */ | |
102 | if (SCM_ICHRP (svalue)) /* character */ | |
103 | return SCM_ICHR (svalue); | |
104 | else if (SCM_IFLAGP (svalue)) | |
105 | { | |
106 | switch ((int) svalue) | |
107 | { | |
108 | #ifndef SICP | |
109 | case SCM_EOL: | |
110 | #endif | |
111 | case SCM_BOOL_F: | |
112 | return 0; | |
113 | case SCM_BOOL_T: | |
114 | return 1; | |
115 | } | |
116 | } | |
117 | error (_("Value can't be converted to integer.")); | |
118 | default: | |
119 | return svalue; | |
120 | } | |
121 | } | |
122 | else | |
123 | return unpack_long (type, valaddr); | |
124 | } | |
125 | ||
126 | /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ | |
127 | ||
128 | static int | |
129 | in_eval_c (void) | |
130 | { | |
131 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
132 | ||
133 | if (cursal.symtab && cursal.symtab->filename) | |
134 | { | |
135 | char *filename = cursal.symtab->filename; | |
136 | int len = strlen (filename); | |
137 | if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) | |
138 | return 1; | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /* Lookup a value for the variable named STR. | |
144 | First lookup in Scheme context (using the scm_lookup_cstr inferior | |
145 | function), then try lookup_symbol for compiled variables. */ | |
146 | ||
147 | static struct value * | |
148 | scm_lookup_name (char *str) | |
149 | { | |
150 | struct value *args[3]; | |
151 | int len = strlen (str); | |
152 | struct value *func; | |
153 | struct value *val; | |
154 | struct symbol *sym; | |
155 | args[0] = value_allocate_space_in_inferior (len); | |
156 | args[1] = value_from_longest (builtin_type_int, len); | |
157 | write_memory (value_as_long (args[0]), (gdb_byte *) str, len); | |
158 | ||
159 | if (in_eval_c () | |
160 | && (sym = lookup_symbol ("env", | |
161 | expression_context_block, | |
162 | VAR_DOMAIN, (int *) NULL, | |
163 | (struct symtab **) NULL)) != NULL) | |
164 | args[2] = value_of_variable (sym, expression_context_block); | |
165 | else | |
166 | /* FIXME in this case, we should try lookup_symbol first */ | |
167 | args[2] = value_from_longest (builtin_type_scm, SCM_EOL); | |
168 | ||
169 | func = find_function_in_inferior ("scm_lookup_cstr"); | |
170 | val = call_function_by_hand (func, 3, args); | |
171 | if (!value_logical_not (val)) | |
172 | return value_ind (val); | |
173 | ||
174 | sym = lookup_symbol (str, | |
175 | expression_context_block, | |
176 | VAR_DOMAIN, (int *) NULL, | |
177 | (struct symtab **) NULL); | |
178 | if (sym) | |
179 | return value_of_variable (sym, NULL); | |
180 | error (_("No symbol \"%s\" in current context."), str); | |
181 | } | |
182 | ||
183 | struct value * | |
184 | scm_evaluate_string (char *str, int len) | |
185 | { | |
186 | struct value *func; | |
187 | struct value *addr = value_allocate_space_in_inferior (len + 1); | |
188 | LONGEST iaddr = value_as_long (addr); | |
189 | write_memory (iaddr, (gdb_byte *) str, len); | |
190 | /* FIXME - should find and pass env */ | |
191 | write_memory (iaddr + len, (gdb_byte *) "", 1); | |
192 | func = find_function_in_inferior ("scm_evstr"); | |
193 | return call_function_by_hand (func, 1, &addr); | |
194 | } | |
195 | ||
196 | static struct value * | |
197 | evaluate_exp (struct type *expect_type, struct expression *exp, | |
198 | int *pos, enum noside noside) | |
199 | { | |
200 | enum exp_opcode op = exp->elts[*pos].opcode; | |
201 | int len, pc; | |
202 | char *str; | |
203 | switch (op) | |
204 | { | |
205 | case OP_NAME: | |
206 | pc = (*pos)++; | |
207 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
208 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
209 | if (noside == EVAL_SKIP) | |
210 | goto nosideret; | |
211 | str = &exp->elts[pc + 2].string; | |
212 | return scm_lookup_name (str); | |
213 | case OP_STRING: | |
214 | pc = (*pos)++; | |
215 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
216 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
217 | if (noside == EVAL_SKIP) | |
218 | goto nosideret; | |
219 | str = &exp->elts[pc + 2].string; | |
220 | return scm_evaluate_string (str, len); | |
221 | default:; | |
222 | } | |
223 | return evaluate_subexp_standard (expect_type, exp, pos, noside); | |
224 | nosideret: | |
225 | return value_from_longest (builtin_type_long, (LONGEST) 1); | |
226 | } | |
227 | ||
228 | const struct exp_descriptor exp_descriptor_scm = | |
229 | { | |
230 | print_subexp_standard, | |
231 | operator_length_standard, | |
232 | op_name_standard, | |
233 | dump_subexp_body_standard, | |
234 | evaluate_exp | |
235 | }; | |
236 | ||
237 | const struct language_defn scm_language_defn = | |
238 | { | |
239 | "scheme", /* Language name */ | |
240 | language_scm, | |
241 | NULL, | |
242 | range_check_off, | |
243 | type_check_off, | |
244 | case_sensitive_off, | |
245 | array_row_major, | |
246 | &exp_descriptor_scm, | |
247 | scm_parse, | |
248 | c_error, | |
249 | null_post_parser, | |
250 | scm_printchar, /* Print a character constant */ | |
251 | scm_printstr, /* Function to print string constant */ | |
252 | NULL, /* Function to print a single character */ | |
253 | NULL, /* Create fundamental type in this language */ | |
254 | c_print_type, /* Print a type using appropriate syntax */ | |
255 | scm_val_print, /* Print a value using appropriate syntax */ | |
256 | scm_value_print, /* Print a top-level value */ | |
257 | NULL, /* Language specific skip_trampoline */ | |
258 | value_of_this, /* value_of_this */ | |
259 | basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ | |
260 | basic_lookup_transparent_type,/* lookup_transparent_type */ | |
261 | NULL, /* Language specific symbol demangler */ | |
262 | NULL, /* Language specific class_name_from_physname */ | |
263 | NULL, /* expression operators for printing */ | |
264 | 1, /* c-style arrays */ | |
265 | 0, /* String lower bound */ | |
266 | NULL, | |
267 | default_word_break_characters, | |
268 | c_language_arch_info, | |
269 | default_print_array_index, | |
41f1b697 | 270 | default_pass_by_reference, |
d4310edb LC |
271 | LANG_MAGIC |
272 | }; | |
273 | ||
274 | void | |
275 | _initialize_scheme_language (void) | |
276 | { | |
277 | add_language (&scm_language_defn); | |
278 | builtin_type_scm = | |
279 | init_type (TYPE_CODE_INT, | |
280 | gdbarch_long_bit (current_gdbarch) / TARGET_CHAR_BIT, | |
281 | 0, "SCM", (struct objfile *) NULL); | |
282 | } |