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d4310edb LC |
1 | /* Scheme/Guile language support routines for GDB, the GNU debugger. |
2 | ||
9b254dd1 | 3 | Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007, |
4c38e0a4 | 4 | 2008, 2009, 2010 Free Software Foundation, Inc. |
d4310edb LC |
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" | |
3e3b026f | 35 | #include "objfiles.h" |
d4310edb LC |
36 | |
37 | extern void _initialize_scheme_language (void); | |
6ceaaae5 | 38 | static struct value *scm_lookup_name (struct gdbarch *, char *); |
d4310edb LC |
39 | static int in_eval_c (void); |
40 | ||
d4310edb | 41 | void |
6c7a06a3 | 42 | scm_printchar (int c, struct type *type, struct ui_file *stream) |
d4310edb LC |
43 | { |
44 | fprintf_filtered (stream, "#\\%c", c); | |
45 | } | |
46 | ||
47 | static void | |
6c7a06a3 | 48 | scm_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string, |
be759fcf | 49 | unsigned int length, const char *encoding, int force_ellipses, |
79a45b7d | 50 | const struct value_print_options *options) |
d4310edb LC |
51 | { |
52 | fprintf_filtered (stream, "\"%s\"", string); | |
53 | } | |
54 | ||
55 | int | |
56 | is_scmvalue_type (struct type *type) | |
57 | { | |
58 | if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) | |
59 | { | |
60 | return 1; | |
61 | } | |
62 | return 0; | |
63 | } | |
64 | ||
65 | /* Get the INDEX'th SCM value, assuming SVALUE is the address | |
66 | of the 0'th one. */ | |
67 | ||
68 | LONGEST | |
e17a4113 UW |
69 | scm_get_field (LONGEST svalue, int index, int size, |
70 | enum bfd_endian byte_order) | |
d4310edb LC |
71 | { |
72 | gdb_byte buffer[20]; | |
6ceaaae5 | 73 | read_memory (SCM2PTR (svalue) + index * size, buffer, size); |
e17a4113 | 74 | return extract_signed_integer (buffer, size, byte_order); |
d4310edb LC |
75 | } |
76 | ||
77 | /* Unpack a value of type TYPE in buffer VALADDR as an integer | |
78 | (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), | |
79 | or Boolean (CONTEXT == TYPE_CODE_BOOL). */ | |
80 | ||
81 | LONGEST | |
82 | scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context) | |
83 | { | |
84 | if (is_scmvalue_type (type)) | |
85 | { | |
e17a4113 UW |
86 | enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type)); |
87 | LONGEST svalue | |
88 | = extract_signed_integer (valaddr, TYPE_LENGTH (type), byte_order); | |
89 | ||
d4310edb LC |
90 | if (context == TYPE_CODE_BOOL) |
91 | { | |
92 | if (svalue == SCM_BOOL_F) | |
93 | return 0; | |
94 | else | |
95 | return 1; | |
96 | } | |
97 | switch (7 & (int) svalue) | |
98 | { | |
99 | case 2: | |
100 | case 6: /* fixnum */ | |
101 | return svalue >> 2; | |
102 | case 4: /* other immediate value */ | |
103 | if (SCM_ICHRP (svalue)) /* character */ | |
104 | return SCM_ICHR (svalue); | |
105 | else if (SCM_IFLAGP (svalue)) | |
106 | { | |
107 | switch ((int) svalue) | |
108 | { | |
109 | #ifndef SICP | |
110 | case SCM_EOL: | |
111 | #endif | |
112 | case SCM_BOOL_F: | |
113 | return 0; | |
114 | case SCM_BOOL_T: | |
115 | return 1; | |
116 | } | |
117 | } | |
118 | error (_("Value can't be converted to integer.")); | |
119 | default: | |
120 | return svalue; | |
121 | } | |
122 | } | |
123 | else | |
124 | return unpack_long (type, valaddr); | |
125 | } | |
126 | ||
127 | /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ | |
128 | ||
129 | static int | |
130 | in_eval_c (void) | |
131 | { | |
132 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
133 | ||
134 | if (cursal.symtab && cursal.symtab->filename) | |
135 | { | |
136 | char *filename = cursal.symtab->filename; | |
137 | int len = strlen (filename); | |
138 | if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) | |
139 | return 1; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
144 | /* Lookup a value for the variable named STR. | |
145 | First lookup in Scheme context (using the scm_lookup_cstr inferior | |
146 | function), then try lookup_symbol for compiled variables. */ | |
147 | ||
148 | static struct value * | |
6ceaaae5 | 149 | scm_lookup_name (struct gdbarch *gdbarch, char *str) |
d4310edb LC |
150 | { |
151 | struct value *args[3]; | |
152 | int len = strlen (str); | |
153 | struct value *func; | |
154 | struct value *val; | |
155 | struct symbol *sym; | |
3e3b026f | 156 | |
6ceaaae5 | 157 | func = find_function_in_inferior ("scm_lookup_cstr", NULL); |
3e3b026f | 158 | |
d4310edb | 159 | args[0] = value_allocate_space_in_inferior (len); |
3e3b026f | 160 | args[1] = value_from_longest (builtin_type (gdbarch)->builtin_int, len); |
d4310edb LC |
161 | write_memory (value_as_long (args[0]), (gdb_byte *) str, len); |
162 | ||
163 | if (in_eval_c () | |
164 | && (sym = lookup_symbol ("env", | |
165 | expression_context_block, | |
2570f2b7 | 166 | VAR_DOMAIN, (int *) NULL)) != NULL) |
d4310edb LC |
167 | args[2] = value_of_variable (sym, expression_context_block); |
168 | else | |
169 | /* FIXME in this case, we should try lookup_symbol first */ | |
6ceaaae5 UW |
170 | args[2] = value_from_longest (builtin_scm_type (gdbarch)->builtin_scm, |
171 | SCM_EOL); | |
d4310edb | 172 | |
d4310edb LC |
173 | val = call_function_by_hand (func, 3, args); |
174 | if (!value_logical_not (val)) | |
175 | return value_ind (val); | |
176 | ||
177 | sym = lookup_symbol (str, | |
178 | expression_context_block, | |
2570f2b7 | 179 | VAR_DOMAIN, (int *) NULL); |
d4310edb LC |
180 | if (sym) |
181 | return value_of_variable (sym, NULL); | |
182 | error (_("No symbol \"%s\" in current context."), str); | |
183 | } | |
184 | ||
185 | struct value * | |
186 | scm_evaluate_string (char *str, int len) | |
187 | { | |
188 | struct value *func; | |
189 | struct value *addr = value_allocate_space_in_inferior (len + 1); | |
190 | LONGEST iaddr = value_as_long (addr); | |
191 | write_memory (iaddr, (gdb_byte *) str, len); | |
192 | /* FIXME - should find and pass env */ | |
193 | write_memory (iaddr + len, (gdb_byte *) "", 1); | |
3e3b026f | 194 | func = find_function_in_inferior ("scm_evstr", NULL); |
d4310edb LC |
195 | return call_function_by_hand (func, 1, &addr); |
196 | } | |
197 | ||
198 | static struct value * | |
199 | evaluate_exp (struct type *expect_type, struct expression *exp, | |
200 | int *pos, enum noside noside) | |
201 | { | |
202 | enum exp_opcode op = exp->elts[*pos].opcode; | |
203 | int len, pc; | |
204 | char *str; | |
205 | switch (op) | |
206 | { | |
207 | case OP_NAME: | |
208 | pc = (*pos)++; | |
209 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
210 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
211 | if (noside == EVAL_SKIP) | |
212 | goto nosideret; | |
213 | str = &exp->elts[pc + 2].string; | |
6ceaaae5 | 214 | return scm_lookup_name (exp->gdbarch, str); |
d4310edb LC |
215 | case OP_STRING: |
216 | pc = (*pos)++; | |
217 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
218 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
219 | if (noside == EVAL_SKIP) | |
220 | goto nosideret; | |
221 | str = &exp->elts[pc + 2].string; | |
222 | return scm_evaluate_string (str, len); | |
223 | default:; | |
224 | } | |
225 | return evaluate_subexp_standard (expect_type, exp, pos, noside); | |
226 | nosideret: | |
22601c15 | 227 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); |
d4310edb LC |
228 | } |
229 | ||
230 | const struct exp_descriptor exp_descriptor_scm = | |
231 | { | |
232 | print_subexp_standard, | |
233 | operator_length_standard, | |
234 | op_name_standard, | |
235 | dump_subexp_body_standard, | |
236 | evaluate_exp | |
237 | }; | |
238 | ||
239 | const struct language_defn scm_language_defn = | |
240 | { | |
241 | "scheme", /* Language name */ | |
242 | language_scm, | |
d4310edb LC |
243 | range_check_off, |
244 | type_check_off, | |
245 | case_sensitive_off, | |
246 | array_row_major, | |
9a044a89 | 247 | macro_expansion_no, |
d4310edb LC |
248 | &exp_descriptor_scm, |
249 | scm_parse, | |
250 | c_error, | |
251 | null_post_parser, | |
252 | scm_printchar, /* Print a character constant */ | |
253 | scm_printstr, /* Function to print string constant */ | |
254 | NULL, /* Function to print a single character */ | |
d4310edb | 255 | c_print_type, /* Print a type using appropriate syntax */ |
5c6ce71d | 256 | default_print_typedef, /* Print a typedef using appropriate syntax */ |
d4310edb LC |
257 | scm_val_print, /* Print a value using appropriate syntax */ |
258 | scm_value_print, /* Print a top-level value */ | |
259 | NULL, /* Language specific skip_trampoline */ | |
2b2d9e11 | 260 | NULL, /* name_of_this */ |
d4310edb LC |
261 | basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ |
262 | basic_lookup_transparent_type,/* lookup_transparent_type */ | |
263 | NULL, /* Language specific symbol demangler */ | |
264 | NULL, /* Language specific class_name_from_physname */ | |
265 | NULL, /* expression operators for printing */ | |
266 | 1, /* c-style arrays */ | |
267 | 0, /* String lower bound */ | |
d4310edb | 268 | default_word_break_characters, |
41d27058 | 269 | default_make_symbol_completion_list, |
d4310edb LC |
270 | c_language_arch_info, |
271 | default_print_array_index, | |
41f1b697 | 272 | default_pass_by_reference, |
ae6a3a4c | 273 | default_get_string, |
d4310edb LC |
274 | LANG_MAGIC |
275 | }; | |
276 | ||
6ceaaae5 UW |
277 | static void * |
278 | build_scm_types (struct gdbarch *gdbarch) | |
279 | { | |
280 | struct builtin_scm_type *builtin_scm_type | |
281 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_scm_type); | |
282 | ||
e9bb382b UW |
283 | builtin_scm_type->builtin_scm |
284 | = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "SCM"); | |
6ceaaae5 UW |
285 | |
286 | return builtin_scm_type; | |
287 | } | |
288 | ||
289 | static struct gdbarch_data *scm_type_data; | |
290 | ||
291 | const struct builtin_scm_type * | |
292 | builtin_scm_type (struct gdbarch *gdbarch) | |
293 | { | |
294 | return gdbarch_data (gdbarch, scm_type_data); | |
295 | } | |
296 | ||
d4310edb LC |
297 | void |
298 | _initialize_scheme_language (void) | |
299 | { | |
6ceaaae5 UW |
300 | scm_type_data = gdbarch_data_register_post_init (build_scm_types); |
301 | ||
d4310edb | 302 | add_language (&scm_language_defn); |
d4310edb | 303 | } |