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0e4ca328 PB |
1 | /* Scheme/Guile language support routines for GDB, the GNU debugger. |
2 | Copyright 1995 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "symtab.h" | |
22 | #include "gdbtypes.h" | |
23 | #include "expression.h" | |
24 | #include "parser-defs.h" | |
25 | #include "language.h" | |
0e4ca328 | 26 | #include "value.h" |
5b4d668a PB |
27 | #include "c-lang.h" |
28 | #include "scm-lang.h" | |
29 | #include "scm-tags.h" | |
0e4ca328 PB |
30 | |
31 | extern struct type ** const (c_builtin_types[]); | |
32 | extern value_ptr value_allocate_space_in_inferior PARAMS ((int)); | |
33 | extern value_ptr find_function_in_inferior PARAMS ((char*)); | |
34 | ||
3c02944a | 35 | struct type *builtin_type_scm; |
0e4ca328 | 36 | |
5b4d668a | 37 | void |
0e4ca328 PB |
38 | scm_printchar (c, stream) |
39 | int c; | |
40 | GDB_FILE *stream; | |
41 | { | |
42 | fprintf_filtered (stream, "#\\%c", c); | |
43 | } | |
44 | ||
45 | static void | |
46 | scm_printstr (stream, string, length, force_ellipses) | |
47 | GDB_FILE *stream; | |
48 | char *string; | |
49 | unsigned int length; | |
50 | int force_ellipses; | |
51 | { | |
52 | fprintf_filtered (stream, "\"%s\"", string); | |
53 | } | |
54 | ||
55 | int | |
5b4d668a | 56 | is_scmvalue_type (type) |
0e4ca328 | 57 | struct type *type; |
0e4ca328 | 58 | { |
5b4d668a PB |
59 | if (TYPE_CODE (type) == TYPE_CODE_INT |
60 | && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) | |
0e4ca328 | 61 | { |
5b4d668a | 62 | return 1; |
0e4ca328 | 63 | } |
5b4d668a | 64 | return 0; |
0e4ca328 PB |
65 | } |
66 | ||
5b4d668a PB |
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 (svalue, index) | |
72 | LONGEST svalue; | |
73 | int index; | |
0e4ca328 | 74 | { |
5b4d668a PB |
75 | value_ptr val; |
76 | char buffer[20]; | |
3c02944a PB |
77 | read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm), |
78 | buffer, TYPE_LENGTH (builtin_type_scm)); | |
79 | return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm)); | |
80 | } | |
81 | ||
82 | /* Unpack a value of type TYPE in buffer VALADDR as an integer | |
83 | (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), | |
84 | or Boolean (CONTEXT == TYPE_CODE_BOOL). */ | |
85 | ||
86 | LONGEST | |
87 | scm_unpack (type, valaddr, context) | |
88 | struct type *type; | |
89 | char *valaddr; | |
90 | enum type_code context; | |
91 | { | |
92 | if (is_scmvalue_type (type)) | |
93 | { | |
94 | LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type)); | |
95 | if (context == TYPE_CODE_BOOL) | |
96 | { | |
97 | if (svalue == SCM_BOOL_F) | |
98 | return 0; | |
99 | else | |
100 | return 1; | |
101 | } | |
102 | switch (7 & svalue) | |
103 | { | |
104 | case 2: case 6: /* fixnum */ | |
105 | return svalue >> 2; | |
106 | case 4: /* other immediate value */ | |
107 | if (SCM_ICHRP (svalue)) /* character */ | |
108 | return SCM_ICHR (svalue); | |
109 | else if (SCM_IFLAGP (svalue)) | |
110 | { | |
111 | switch (svalue) | |
112 | { | |
113 | #ifndef SICP | |
114 | case SCM_EOL: | |
115 | #endif | |
116 | case SCM_BOOL_F: | |
117 | return 0; | |
118 | case SCM_BOOL_T: | |
119 | return 1; | |
120 | } | |
121 | } | |
122 | error ("Value can't be converted to integer."); | |
123 | default: | |
124 | return svalue; | |
125 | } | |
126 | } | |
127 | else | |
128 | return unpack_long (type, valaddr); | |
129 | } | |
130 | ||
131 | /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ | |
132 | ||
133 | static int | |
134 | in_eval_c () | |
135 | { | |
136 | if (current_source_symtab && current_source_symtab->filename) | |
137 | { | |
138 | char *filename = current_source_symtab->filename; | |
139 | int len = strlen (filename); | |
140 | if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) | |
141 | return 1; | |
142 | } | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* Lookup a value for the variable named STR. | |
147 | First lookup in Scheme context (using the scm_lookup_cstr inferior | |
148 | function), then try lookup_symbol for compiled variables. */ | |
149 | ||
150 | value_ptr | |
151 | scm_lookup_name (str) | |
152 | char *str; | |
153 | { | |
154 | value_ptr args[3]; | |
155 | int len = strlen (str); | |
156 | value_ptr symval, func, val; | |
157 | struct symbol *sym; | |
158 | args[0] = value_allocate_space_in_inferior (len); | |
159 | args[1] = value_from_longest (builtin_type_int, len); | |
160 | write_memory (value_as_long (args[0]), str, len); | |
161 | ||
162 | if (in_eval_c () | |
163 | && (sym = lookup_symbol ("env", | |
164 | expression_context_block, | |
165 | VAR_NAMESPACE, (int *) NULL, | |
166 | (struct symtab **) NULL)) != NULL) | |
167 | args[2] = value_of_variable (sym, expression_context_block); | |
168 | else | |
169 | /* FIXME in this case, we should try lookup_symbol first */ | |
170 | args[2] = value_from_longest (builtin_type_scm, SCM_EOL); | |
171 | ||
172 | func = find_function_in_inferior ("scm_lookup_cstr"); | |
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, | |
179 | VAR_NAMESPACE, (int *) NULL, | |
180 | (struct symtab **) NULL); | |
181 | if (sym) | |
182 | return value_of_variable (sym, NULL); | |
183 | error ("No symbol \"%s\" in current context."); | |
184 | } | |
185 | ||
186 | value_ptr | |
187 | scm_evaluate_string (str, len) | |
188 | char *str; int len; | |
189 | { | |
190 | value_ptr func; | |
191 | value_ptr addr = value_allocate_space_in_inferior (len + 1); | |
192 | LONGEST iaddr = value_as_long (addr); | |
193 | write_memory (iaddr, str, len); | |
194 | /* FIXME - should find and pass env */ | |
195 | write_memory (iaddr + len, "", 1); | |
196 | func = find_function_in_inferior ("scm_evstr"); | |
197 | return call_function_by_hand (func, 1, &addr); | |
0e4ca328 PB |
198 | } |
199 | ||
200 | static value_ptr | |
201 | evaluate_subexp_scm (expect_type, exp, pos, noside) | |
202 | struct type *expect_type; | |
203 | register struct expression *exp; | |
204 | register int *pos; | |
205 | enum noside noside; | |
206 | { | |
207 | enum exp_opcode op = exp->elts[*pos].opcode; | |
0e4ca328 PB |
208 | int len, pc; char *str; |
209 | switch (op) | |
210 | { | |
3c02944a PB |
211 | case OP_NAME: |
212 | pc = (*pos)++; | |
213 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
214 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
215 | if (noside == EVAL_SKIP) | |
216 | goto nosideret; | |
217 | str = &exp->elts[pc + 2].string; | |
218 | return scm_lookup_name (str); | |
0e4ca328 PB |
219 | case OP_EXPRSTRING: |
220 | pc = (*pos)++; | |
221 | len = longest_to_int (exp->elts[pc + 1].longconst); | |
222 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); | |
223 | if (noside == EVAL_SKIP) | |
224 | goto nosideret; | |
3c02944a PB |
225 | str = &exp->elts[pc + 2].string; |
226 | return scm_evaluate_string (str, len); | |
0e4ca328 PB |
227 | default: ; |
228 | } | |
229 | return evaluate_subexp_standard (expect_type, exp, pos, noside); | |
230 | nosideret: | |
231 | return value_from_longest (builtin_type_long, (LONGEST) 1); | |
232 | } | |
233 | ||
234 | const struct language_defn scm_language_defn = { | |
235 | "scheme", /* Language name */ | |
236 | language_scm, | |
237 | c_builtin_types, | |
238 | range_check_off, | |
239 | type_check_off, | |
240 | scm_parse, | |
241 | c_error, | |
242 | evaluate_subexp_scm, | |
243 | scm_printchar, /* Print a character constant */ | |
244 | scm_printstr, /* Function to print string constant */ | |
245 | NULL, /* Create fundamental type in this language */ | |
246 | c_print_type, /* Print a type using appropriate syntax */ | |
247 | scm_val_print, /* Print a value using appropriate syntax */ | |
248 | scm_value_print, /* Print a top-level value */ | |
249 | {"", "", "", ""}, /* Binary format info */ | |
250 | {"#o%lo", "#o", "o", ""}, /* Octal format info */ | |
251 | {"%ld", "", "d", ""}, /* Decimal format info */ | |
252 | {"#x%lX", "#X", "X", ""}, /* Hex format info */ | |
253 | NULL, /* expression operators for printing */ | |
254 | 1, /* c-style arrays */ | |
255 | 0, /* String lower bound */ | |
256 | &builtin_type_char, /* Type of string elements */ | |
257 | LANG_MAGIC | |
258 | }; | |
259 | ||
260 | void | |
261 | _initialize_scheme_language () | |
262 | { | |
263 | add_language (&scm_language_defn); | |
3c02944a PB |
264 | builtin_type_scm = init_type (TYPE_CODE_INT, |
265 | TARGET_LONG_BIT / TARGET_CHAR_BIT, | |
266 | 0, "SCM", (struct objfile *) NULL); | |
0e4ca328 | 267 | } |