dma: beautify queue listing output
[dragonfly.git] / contrib / gdb-6.2.1 / gdb / scm-lang.c
blob665ac1b96bf56f9a7fbcf76bbea4913002dd3f87
1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
3 Copyright 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004 Free Software
4 Foundation, Inc.
6 This file is part of GDB.
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
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 #include "defs.h"
24 #include "symtab.h"
25 #include "gdbtypes.h"
26 #include "expression.h"
27 #include "parser-defs.h"
28 #include "language.h"
29 #include "value.h"
30 #include "c-lang.h"
31 #include "scm-lang.h"
32 #include "scm-tags.h"
33 #include "source.h"
34 #include "gdb_string.h"
35 #include "gdbcore.h"
36 #include "infcall.h"
38 extern void _initialize_scheme_language (void);
39 static struct value *evaluate_subexp_scm (struct type *, struct expression *,
40 int *, enum noside);
41 static struct value *scm_lookup_name (char *);
42 static int in_eval_c (void);
43 static void scm_printstr (struct ui_file * stream, char *string,
44 unsigned int length, int width,
45 int force_ellipses);
47 extern struct type **const (c_builtin_types[]);
49 struct type *builtin_type_scm;
51 void
52 scm_printchar (int c, struct ui_file *stream)
54 fprintf_filtered (stream, "#\\%c", c);
57 static void
58 scm_printstr (struct ui_file *stream, char *string, unsigned int length,
59 int width, int force_ellipses)
61 fprintf_filtered (stream, "\"%s\"", string);
64 int
65 is_scmvalue_type (struct type *type)
67 if (TYPE_CODE (type) == TYPE_CODE_INT
68 && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
70 return 1;
72 return 0;
75 /* Get the INDEX'th SCM value, assuming SVALUE is the address
76 of the 0'th one. */
78 LONGEST
79 scm_get_field (LONGEST svalue, int index)
81 char buffer[20];
82 read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
83 buffer, TYPE_LENGTH (builtin_type_scm));
84 return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
87 /* Unpack a value of type TYPE in buffer VALADDR as an integer
88 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
89 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
91 LONGEST
92 scm_unpack (struct type *type, const char *valaddr, enum type_code context)
94 if (is_scmvalue_type (type))
96 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
97 if (context == TYPE_CODE_BOOL)
99 if (svalue == SCM_BOOL_F)
100 return 0;
101 else
102 return 1;
104 switch (7 & (int) svalue)
106 case 2:
107 case 6: /* fixnum */
108 return svalue >> 2;
109 case 4: /* other immediate value */
110 if (SCM_ICHRP (svalue)) /* character */
111 return SCM_ICHR (svalue);
112 else if (SCM_IFLAGP (svalue))
114 switch ((int) svalue)
116 #ifndef SICP
117 case SCM_EOL:
118 #endif
119 case SCM_BOOL_F:
120 return 0;
121 case SCM_BOOL_T:
122 return 1;
125 error ("Value can't be converted to integer.");
126 default:
127 return svalue;
130 else
131 return unpack_long (type, valaddr);
134 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
136 static int
137 in_eval_c (void)
139 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
141 if (cursal.symtab && cursal.symtab->filename)
143 char *filename = cursal.symtab->filename;
144 int len = strlen (filename);
145 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
146 return 1;
148 return 0;
151 /* Lookup a value for the variable named STR.
152 First lookup in Scheme context (using the scm_lookup_cstr inferior
153 function), then try lookup_symbol for compiled variables. */
155 static struct value *
156 scm_lookup_name (char *str)
158 struct value *args[3];
159 int len = strlen (str);
160 struct value *func;
161 struct value *val;
162 struct symbol *sym;
163 args[0] = value_allocate_space_in_inferior (len);
164 args[1] = value_from_longest (builtin_type_int, len);
165 write_memory (value_as_long (args[0]), str, len);
167 if (in_eval_c ()
168 && (sym = lookup_symbol ("env",
169 expression_context_block,
170 VAR_DOMAIN, (int *) NULL,
171 (struct symtab **) NULL)) != NULL)
172 args[2] = value_of_variable (sym, expression_context_block);
173 else
174 /* FIXME in this case, we should try lookup_symbol first */
175 args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
177 func = find_function_in_inferior ("scm_lookup_cstr");
178 val = call_function_by_hand (func, 3, args);
179 if (!value_logical_not (val))
180 return value_ind (val);
182 sym = lookup_symbol (str,
183 expression_context_block,
184 VAR_DOMAIN, (int *) NULL,
185 (struct symtab **) NULL);
186 if (sym)
187 return value_of_variable (sym, NULL);
188 error ("No symbol \"%s\" in current context.", str);
191 struct value *
192 scm_evaluate_string (char *str, int len)
194 struct value *func;
195 struct value *addr = value_allocate_space_in_inferior (len + 1);
196 LONGEST iaddr = value_as_long (addr);
197 write_memory (iaddr, str, len);
198 /* FIXME - should find and pass env */
199 write_memory (iaddr + len, "", 1);
200 func = find_function_in_inferior ("scm_evstr");
201 return call_function_by_hand (func, 1, &addr);
204 static struct value *
205 evaluate_subexp_scm (struct type *expect_type, struct expression *exp,
206 int *pos, enum noside noside)
208 enum exp_opcode op = exp->elts[*pos].opcode;
209 int len, pc;
210 char *str;
211 switch (op)
213 case OP_NAME:
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_lookup_name (str);
221 case OP_EXPRSTRING:
222 pc = (*pos)++;
223 len = longest_to_int (exp->elts[pc + 1].longconst);
224 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
225 if (noside == EVAL_SKIP)
226 goto nosideret;
227 str = &exp->elts[pc + 2].string;
228 return scm_evaluate_string (str, len);
229 default:;
231 return evaluate_subexp_standard (expect_type, exp, pos, noside);
232 nosideret:
233 return value_from_longest (builtin_type_long, (LONGEST) 1);
236 const struct exp_descriptor exp_descriptor_scm =
238 print_subexp_standard,
239 operator_length_standard,
240 op_name_standard,
241 dump_subexp_body_standard,
242 evaluate_subexp_scm
245 const struct language_defn scm_language_defn =
247 "scheme", /* Language name */
248 language_scm,
249 c_builtin_types,
250 range_check_off,
251 type_check_off,
252 case_sensitive_off,
253 &exp_descriptor_scm,
254 scm_parse,
255 c_error,
256 null_post_parser,
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 */
264 NULL, /* Language specific skip_trampoline */
265 value_of_this, /* value_of_this */
266 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
267 basic_lookup_transparent_type,/* lookup_transparent_type */
268 NULL, /* Language specific symbol demangler */
269 NULL, /* Language specific class_name_from_physname */
270 {"", "", "", ""}, /* Binary format info */
271 {"#o%lo", "#o", "o", ""}, /* Octal format info */
272 {"%ld", "", "d", ""}, /* Decimal format info */
273 {"#x%lX", "#X", "X", ""}, /* Hex format info */
274 NULL, /* expression operators for printing */
275 1, /* c-style arrays */
276 0, /* String lower bound */
277 &builtin_type_char, /* Type of string elements */
278 default_word_break_characters,
279 LANG_MAGIC
282 void
283 _initialize_scheme_language (void)
285 add_language (&scm_language_defn);
286 builtin_type_scm = init_type (TYPE_CODE_INT,
287 TARGET_LONG_BIT / TARGET_CHAR_BIT,
288 0, "SCM", (struct objfile *) NULL);