1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
2 Copyright 1995, 1996, 1998, 2000, 2001, 2002
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
25 #include "expression.h"
26 #include "parser-defs.h"
32 #include "gdb_string.h"
35 extern void _initialize_scheme_language (void);
36 static struct value *evaluate_subexp_scm (struct type *, struct expression *,
38 static struct value *scm_lookup_name (char *);
39 static int in_eval_c (void);
40 static void scm_printstr (struct ui_file * stream, char *string,
41 unsigned int length, int width,
44 extern struct type **CONST_PTR (c_builtin_types[]);
46 struct type *builtin_type_scm;
49 scm_printchar (int c, struct ui_file *stream)
51 fprintf_filtered (stream, "#\\%c", c);
55 scm_printstr (struct ui_file *stream, char *string, unsigned int length,
56 int width, int force_ellipses)
58 fprintf_filtered (stream, "\"%s\"", string);
62 is_scmvalue_type (struct type *type)
64 if (TYPE_CODE (type) == TYPE_CODE_INT
65 && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
72 /* Get the INDEX'th SCM value, assuming SVALUE is the address
76 scm_get_field (LONGEST svalue, int index)
79 read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
80 buffer, TYPE_LENGTH (builtin_type_scm));
81 return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
84 /* Unpack a value of type TYPE in buffer VALADDR as an integer
85 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
86 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
89 scm_unpack (struct type *type, char *valaddr, enum type_code context)
91 if (is_scmvalue_type (type))
93 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
94 if (context == TYPE_CODE_BOOL)
96 if (svalue == SCM_BOOL_F)
101 switch (7 & (int) svalue)
106 case 4: /* other immediate value */
107 if (SCM_ICHRP (svalue)) /* character */
108 return SCM_ICHR (svalue);
109 else if (SCM_IFLAGP (svalue))
111 switch ((int) svalue)
122 error ("Value can't be converted to integer.");
128 return unpack_long (type, valaddr);
131 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
136 if (current_source_symtab && current_source_symtab->filename)
138 char *filename = current_source_symtab->filename;
139 int len = strlen (filename);
140 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
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. */
150 static struct value *
151 scm_lookup_name (char *str)
153 struct value *args[3];
154 int len = strlen (str);
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);
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);
169 /* FIXME in this case, we should try lookup_symbol first */
170 args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
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);
177 sym = lookup_symbol (str,
178 expression_context_block,
179 VAR_NAMESPACE, (int *) NULL,
180 (struct symtab **) NULL);
182 return value_of_variable (sym, NULL);
183 error ("No symbol \"%s\" in current context.");
187 scm_evaluate_string (char *str, int len)
190 struct value *addr = value_allocate_space_in_inferior (len + 1);
191 LONGEST iaddr = value_as_long (addr);
192 write_memory (iaddr, str, len);
193 /* FIXME - should find and pass env */
194 write_memory (iaddr + len, "", 1);
195 func = find_function_in_inferior ("scm_evstr");
196 return call_function_by_hand (func, 1, &addr);
199 static struct value *
200 evaluate_subexp_scm (struct type *expect_type, register struct expression *exp,
201 register int *pos, enum noside noside)
203 enum exp_opcode op = exp->elts[*pos].opcode;
210 len = longest_to_int (exp->elts[pc + 1].longconst);
211 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
212 if (noside == EVAL_SKIP)
214 str = &exp->elts[pc + 2].string;
215 return scm_lookup_name (str);
218 len = longest_to_int (exp->elts[pc + 1].longconst);
219 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
220 if (noside == EVAL_SKIP)
222 str = &exp->elts[pc + 2].string;
223 return scm_evaluate_string (str, len);
226 return evaluate_subexp_standard (expect_type, exp, pos, noside);
228 return value_from_longest (builtin_type_long, (LONGEST) 1);
231 const struct language_defn scm_language_defn =
233 "scheme", /* Language name */
242 scm_printchar, /* Print a character constant */
243 scm_printstr, /* Function to print string constant */
244 NULL, /* Function to print a single character */
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 */
261 _initialize_scheme_language (void)
263 add_language (&scm_language_defn);
264 builtin_type_scm = init_type (TYPE_CODE_INT,
265 TARGET_LONG_BIT / TARGET_CHAR_BIT,
266 0, "SCM", (struct objfile *) NULL);