Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Scheme/Guile language support routines for GDB, the GNU debugger. |
d9fcf2fb | 2 | Copyright 1995, 2000 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
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 "gdb_string.h" | |
32 | #include "gdbcore.h" | |
33 | ||
392a587b | 34 | extern void _initialize_scheme_language PARAMS ((void)); |
c906108c SS |
35 | static value_ptr evaluate_subexp_scm PARAMS ((struct type *, struct expression *, |
36 | int *, enum noside)); | |
37 | static value_ptr scm_lookup_name PARAMS ((char *)); | |
38 | static int in_eval_c PARAMS ((void)); | |
d9fcf2fb JM |
39 | static void scm_printstr (struct ui_file * stream, char *string, |
40 | unsigned int length, int width, | |
41 | int force_ellipses); | |
c906108c | 42 | |
c5aa993b | 43 | extern struct type **CONST_PTR (c_builtin_types[]); |
c906108c SS |
44 | |
45 | struct type *builtin_type_scm; | |
46 | ||
47 | void | |
48 | scm_printchar (c, stream) | |
49 | int c; | |
d9fcf2fb | 50 | struct ui_file *stream; |
c906108c SS |
51 | { |
52 | fprintf_filtered (stream, "#\\%c", c); | |
53 | } | |
54 | ||
55 | static void | |
56 | scm_printstr (stream, string, length, width, force_ellipses) | |
d9fcf2fb | 57 | struct ui_file *stream; |
c906108c SS |
58 | char *string; |
59 | unsigned int length; | |
60 | int width; | |
61 | int force_ellipses; | |
62 | { | |
63 | fprintf_filtered (stream, "\"%s\"", string); | |
64 | } | |
65 | ||
66 | int | |
67 | is_scmvalue_type (type) | |
68 | struct type *type; | |
69 | { | |
70 | if (TYPE_CODE (type) == TYPE_CODE_INT | |
71 | && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) | |
72 | { | |
73 | return 1; | |
74 | } | |
75 | return 0; | |
76 | } | |
77 | ||
78 | /* Get the INDEX'th SCM value, assuming SVALUE is the address | |
79 | of the 0'th one. */ | |
80 | ||
81 | LONGEST | |
82 | scm_get_field (svalue, index) | |
83 | LONGEST svalue; | |
84 | int index; | |
85 | { | |
86 | char buffer[20]; | |
87 | read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm), | |
88 | buffer, TYPE_LENGTH (builtin_type_scm)); | |
89 | return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm)); | |
90 | } | |
91 | ||
92 | /* Unpack a value of type TYPE in buffer VALADDR as an integer | |
93 | (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), | |
94 | or Boolean (CONTEXT == TYPE_CODE_BOOL). */ | |
95 | ||
96 | LONGEST | |
97 | scm_unpack (type, valaddr, context) | |
98 | struct type *type; | |
99 | char *valaddr; | |
100 | enum type_code context; | |
101 | { | |
102 | if (is_scmvalue_type (type)) | |
103 | { | |
104 | LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type)); | |
105 | if (context == TYPE_CODE_BOOL) | |
106 | { | |
107 | if (svalue == SCM_BOOL_F) | |
108 | return 0; | |
109 | else | |
110 | return 1; | |
111 | } | |
112 | switch (7 & (int) svalue) | |
113 | { | |
c5aa993b JM |
114 | case 2: |
115 | case 6: /* fixnum */ | |
c906108c | 116 | return svalue >> 2; |
c5aa993b JM |
117 | case 4: /* other immediate value */ |
118 | if (SCM_ICHRP (svalue)) /* character */ | |
c906108c SS |
119 | return SCM_ICHR (svalue); |
120 | else if (SCM_IFLAGP (svalue)) | |
121 | { | |
122 | switch ((int) svalue) | |
123 | { | |
124 | #ifndef SICP | |
125 | case SCM_EOL: | |
126 | #endif | |
127 | case SCM_BOOL_F: | |
128 | return 0; | |
129 | case SCM_BOOL_T: | |
130 | return 1; | |
131 | } | |
132 | } | |
133 | error ("Value can't be converted to integer."); | |
134 | default: | |
135 | return svalue; | |
136 | } | |
137 | } | |
138 | else | |
139 | return unpack_long (type, valaddr); | |
140 | } | |
141 | ||
142 | /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ | |
143 | ||
144 | static int | |
145 | in_eval_c () | |
146 | { | |
147 | if (current_source_symtab && current_source_symtab->filename) | |
148 | { | |
149 | char *filename = current_source_symtab->filename; | |
150 | int len = strlen (filename); | |
151 | if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) | |
152 | return 1; | |
153 | } | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* Lookup a value for the variable named STR. | |
158 | First lookup in Scheme context (using the scm_lookup_cstr inferior | |
159 | function), then try lookup_symbol for compiled variables. */ | |
160 | ||
161 | static value_ptr | |
162 | scm_lookup_name (str) | |
163 | char *str; | |
164 | { | |
165 | value_ptr args[3]; | |
166 | int len = strlen (str); | |
167 | value_ptr func, val; | |
168 | struct symbol *sym; | |
169 | args[0] = value_allocate_space_in_inferior (len); | |
170 | args[1] = value_from_longest (builtin_type_int, len); | |
171 | write_memory (value_as_long (args[0]), str, len); | |
172 | ||
173 | if (in_eval_c () | |
174 | && (sym = lookup_symbol ("env", | |
175 | expression_context_block, | |
176 | VAR_NAMESPACE, (int *) NULL, | |
177 | (struct symtab **) NULL)) != NULL) | |
178 | args[2] = value_of_variable (sym, expression_context_block); | |
179 | else | |
180 | /* FIXME in this case, we should try lookup_symbol first */ | |
181 | args[2] = value_from_longest (builtin_type_scm, SCM_EOL); | |
182 | ||
183 | func = find_function_in_inferior ("scm_lookup_cstr"); | |
184 | val = call_function_by_hand (func, 3, args); | |
185 | if (!value_logical_not (val)) | |
186 | return value_ind (val); | |
187 | ||
188 | sym = lookup_symbol (str, | |
189 | expression_context_block, | |
190 | VAR_NAMESPACE, (int *) NULL, | |
191 | (struct symtab **) NULL); | |
192 | if (sym) | |
193 | return value_of_variable (sym, NULL); | |
194 | error ("No symbol \"%s\" in current context."); | |
195 | } | |
196 | ||
197 | value_ptr | |
198 | scm_evaluate_string (str, len) | |
c5aa993b JM |
199 | char *str; |
200 | int len; | |
c906108c SS |
201 | { |
202 | value_ptr func; | |
203 | value_ptr addr = value_allocate_space_in_inferior (len + 1); | |
204 | LONGEST iaddr = value_as_long (addr); | |
205 | write_memory (iaddr, str, len); | |
206 | /* FIXME - should find and pass env */ | |
207 | write_memory (iaddr + len, "", 1); | |
208 | func = find_function_in_inferior ("scm_evstr"); | |
209 | return call_function_by_hand (func, 1, &addr); | |
210 | } | |
211 | ||
212 | static value_ptr | |
213 | evaluate_subexp_scm (expect_type, exp, pos, noside) | |
214 | struct type *expect_type; | |
215 | register struct expression *exp; | |
216 | register int *pos; | |
217 | enum noside noside; | |
218 | { | |
219 | enum exp_opcode op = exp->elts[*pos].opcode; | |
c5aa993b JM |
220 | int len, pc; |
221 | char *str; | |
c906108c SS |
222 | switch (op) |
223 | { | |
224 | case OP_NAME: | |
225 | pc = (*pos)++; | |
226 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
227 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
228 | if (noside == EVAL_SKIP) | |
229 | goto nosideret; | |
230 | str = &exp->elts[pc + 2].string; | |
231 | return scm_lookup_name (str); | |
232 | case OP_EXPRSTRING: | |
233 | pc = (*pos)++; | |
234 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
235 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
236 | if (noside == EVAL_SKIP) | |
237 | goto nosideret; | |
238 | str = &exp->elts[pc + 2].string; | |
239 | return scm_evaluate_string (str, len); | |
c5aa993b | 240 | default:; |
c906108c SS |
241 | } |
242 | return evaluate_subexp_standard (expect_type, exp, pos, noside); | |
c5aa993b | 243 | nosideret: |
c906108c SS |
244 | return value_from_longest (builtin_type_long, (LONGEST) 1); |
245 | } | |
246 | ||
c5aa993b JM |
247 | const struct language_defn scm_language_defn = |
248 | { | |
c906108c SS |
249 | "scheme", /* Language name */ |
250 | language_scm, | |
251 | c_builtin_types, | |
252 | range_check_off, | |
253 | type_check_off, | |
254 | scm_parse, | |
255 | c_error, | |
256 | evaluate_subexp_scm, | |
257 | scm_printchar, /* Print a character constant */ | |
258 | scm_printstr, /* Function to print string constant */ | |
259 | NULL, /* Function to print a single character */ | |
260 | NULL, /* Create fundamental type in this language */ | |
261 | c_print_type, /* Print a type using appropriate syntax */ | |
262 | scm_val_print, /* Print a value using appropriate syntax */ | |
263 | scm_value_print, /* Print a top-level value */ | |
c5aa993b JM |
264 | {"", "", "", ""}, /* Binary format info */ |
265 | {"#o%lo", "#o", "o", ""}, /* Octal format info */ | |
266 | {"%ld", "", "d", ""}, /* Decimal format info */ | |
267 | {"#x%lX", "#X", "X", ""}, /* Hex format info */ | |
c906108c SS |
268 | NULL, /* expression operators for printing */ |
269 | 1, /* c-style arrays */ | |
270 | 0, /* String lower bound */ | |
c5aa993b | 271 | &builtin_type_char, /* Type of string elements */ |
c906108c SS |
272 | LANG_MAGIC |
273 | }; | |
274 | ||
275 | void | |
276 | _initialize_scheme_language () | |
277 | { | |
278 | add_language (&scm_language_defn); | |
279 | builtin_type_scm = init_type (TYPE_CODE_INT, | |
280 | TARGET_LONG_BIT / TARGET_CHAR_BIT, | |
281 | 0, "SCM", (struct objfile *) NULL); | |
282 | } |