1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
2 Copyright 1995, 2000 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
24 #include "expression.h"
25 #include "parser-defs.h"
31 #include "gdb_string.h"
34 extern void _initialize_scheme_language (void);
35 static value_ptr evaluate_subexp_scm (struct type *, struct expression *,
37 static value_ptr scm_lookup_name (char *);
38 static int in_eval_c (void);
39 static void scm_printstr (struct ui_file * stream, char *string,
40 unsigned int length, int width,
43 extern struct type **CONST_PTR (c_builtin_types[]);
45 struct type *builtin_type_scm;
48 scm_printchar (c, stream)
50 struct ui_file *stream;
52 fprintf_filtered (stream, "#\\%c", c);
56 scm_printstr (stream, string, length, width, force_ellipses)
57 struct ui_file *stream;
63 fprintf_filtered (stream, "\"%s\"", string);
67 is_scmvalue_type (type)
70 if (TYPE_CODE (type) == TYPE_CODE_INT
71 && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
78 /* Get the INDEX'th SCM value, assuming SVALUE is the address
82 scm_get_field (svalue, index)
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));
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). */
97 scm_unpack (type, valaddr, context)
100 enum type_code context;
102 if (is_scmvalue_type (type))
104 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
105 if (context == TYPE_CODE_BOOL)
107 if (svalue == SCM_BOOL_F)
112 switch (7 & (int) svalue)
117 case 4: /* other immediate value */
118 if (SCM_ICHRP (svalue)) /* character */
119 return SCM_ICHR (svalue);
120 else if (SCM_IFLAGP (svalue))
122 switch ((int) svalue)
133 error ("Value can't be converted to integer.");
139 return unpack_long (type, valaddr);
142 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
147 if (current_source_symtab && current_source_symtab->filename)
149 char *filename = current_source_symtab->filename;
150 int len = strlen (filename);
151 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
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. */
162 scm_lookup_name (str)
166 int len = strlen (str);
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);
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);
180 /* FIXME in this case, we should try lookup_symbol first */
181 args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
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);
188 sym = lookup_symbol (str,
189 expression_context_block,
190 VAR_NAMESPACE, (int *) NULL,
191 (struct symtab **) NULL);
193 return value_of_variable (sym, NULL);
194 error ("No symbol \"%s\" in current context.");
198 scm_evaluate_string (str, len)
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);
213 evaluate_subexp_scm (expect_type, exp, pos, noside)
214 struct type *expect_type;
215 register struct expression *exp;
219 enum exp_opcode op = exp->elts[*pos].opcode;
226 len = longest_to_int (exp->elts[pc + 1].longconst);
227 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
228 if (noside == EVAL_SKIP)
230 str = &exp->elts[pc + 2].string;
231 return scm_lookup_name (str);
234 len = longest_to_int (exp->elts[pc + 1].longconst);
235 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
236 if (noside == EVAL_SKIP)
238 str = &exp->elts[pc + 2].string;
239 return scm_evaluate_string (str, len);
242 return evaluate_subexp_standard (expect_type, exp, pos, noside);
244 return value_from_longest (builtin_type_long, (LONGEST) 1);
247 const struct language_defn scm_language_defn =
249 "scheme", /* Language name */
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 {"", "", "", ""}, /* 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 */
268 NULL, /* expression operators for printing */
269 1, /* c-style arrays */
270 0, /* String lower bound */
271 &builtin_type_char, /* Type of string elements */
276 _initialize_scheme_language ()
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);