1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
3 Copyright 1995, 1996, 1998, 2000, 2001, 2002, 2003 Free Software
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. */
26 #include "expression.h"
27 #include "parser-defs.h"
34 #include "gdb_string.h"
37 extern void _initialize_scheme_language (void);
38 static struct value
*evaluate_subexp_scm (struct type
*, struct expression
*,
40 static struct value
*scm_lookup_name (char *);
41 static int in_eval_c (void);
42 static void scm_printstr (struct ui_file
* stream
, char *string
,
43 unsigned int length
, int width
,
46 extern struct type
**const (c_builtin_types
[]);
48 struct type
*builtin_type_scm
;
51 scm_printchar (int c
, struct ui_file
*stream
)
53 fprintf_filtered (stream
, "#\\%c", c
);
57 scm_printstr (struct ui_file
*stream
, char *string
, unsigned int length
,
58 int width
, int force_ellipses
)
60 fprintf_filtered (stream
, "\"%s\"", string
);
64 is_scmvalue_type (struct type
*type
)
66 if (TYPE_CODE (type
) == TYPE_CODE_INT
67 && TYPE_NAME (type
) && strcmp (TYPE_NAME (type
), "SCM") == 0)
74 /* Get the INDEX'th SCM value, assuming SVALUE is the address
78 scm_get_field (LONGEST svalue
, int index
)
81 read_memory (SCM2PTR (svalue
) + index
* TYPE_LENGTH (builtin_type_scm
),
82 buffer
, TYPE_LENGTH (builtin_type_scm
));
83 return extract_signed_integer (buffer
, TYPE_LENGTH (builtin_type_scm
));
86 /* Unpack a value of type TYPE in buffer VALADDR as an integer
87 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
88 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
91 scm_unpack (struct type
*type
, const char *valaddr
, enum type_code context
)
93 if (is_scmvalue_type (type
))
95 LONGEST svalue
= extract_signed_integer (valaddr
, TYPE_LENGTH (type
));
96 if (context
== TYPE_CODE_BOOL
)
98 if (svalue
== SCM_BOOL_F
)
103 switch (7 & (int) svalue
)
108 case 4: /* other immediate value */
109 if (SCM_ICHRP (svalue
)) /* character */
110 return SCM_ICHR (svalue
);
111 else if (SCM_IFLAGP (svalue
))
113 switch ((int) svalue
)
124 error ("Value can't be converted to integer.");
130 return unpack_long (type
, valaddr
);
133 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
138 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
140 if (cursal
.symtab
&& cursal
.symtab
->filename
)
142 char *filename
= cursal
.symtab
->filename
;
143 int len
= strlen (filename
);
144 if (len
>= 6 && strcmp (filename
+ len
- 6, "eval.c") == 0)
150 /* Lookup a value for the variable named STR.
151 First lookup in Scheme context (using the scm_lookup_cstr inferior
152 function), then try lookup_symbol for compiled variables. */
154 static struct value
*
155 scm_lookup_name (char *str
)
157 struct value
*args
[3];
158 int len
= strlen (str
);
162 args
[0] = value_allocate_space_in_inferior (len
);
163 args
[1] = value_from_longest (builtin_type_int
, len
);
164 write_memory (value_as_long (args
[0]), str
, len
);
167 && (sym
= lookup_symbol ("env",
168 expression_context_block
,
169 VAR_NAMESPACE
, (int *) NULL
,
170 (struct symtab
**) NULL
)) != NULL
)
171 args
[2] = value_of_variable (sym
, expression_context_block
);
173 /* FIXME in this case, we should try lookup_symbol first */
174 args
[2] = value_from_longest (builtin_type_scm
, SCM_EOL
);
176 func
= find_function_in_inferior ("scm_lookup_cstr");
177 val
= call_function_by_hand (func
, 3, args
);
178 if (!value_logical_not (val
))
179 return value_ind (val
);
181 sym
= lookup_symbol (str
,
182 expression_context_block
,
183 VAR_NAMESPACE
, (int *) NULL
,
184 (struct symtab
**) NULL
);
186 return value_of_variable (sym
, NULL
);
187 error ("No symbol \"%s\" in current context.", str
);
191 scm_evaluate_string (char *str
, int len
)
194 struct value
*addr
= value_allocate_space_in_inferior (len
+ 1);
195 LONGEST iaddr
= value_as_long (addr
);
196 write_memory (iaddr
, str
, len
);
197 /* FIXME - should find and pass env */
198 write_memory (iaddr
+ len
, "", 1);
199 func
= find_function_in_inferior ("scm_evstr");
200 return call_function_by_hand (func
, 1, &addr
);
203 static struct value
*
204 evaluate_subexp_scm (struct type
*expect_type
, register struct expression
*exp
,
205 register int *pos
, enum noside noside
)
207 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
214 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
215 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
216 if (noside
== EVAL_SKIP
)
218 str
= &exp
->elts
[pc
+ 2].string
;
219 return scm_lookup_name (str
);
222 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
223 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
224 if (noside
== EVAL_SKIP
)
226 str
= &exp
->elts
[pc
+ 2].string
;
227 return scm_evaluate_string (str
, len
);
230 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
232 return value_from_longest (builtin_type_long
, (LONGEST
) 1);
235 const struct language_defn scm_language_defn
=
237 "scheme", /* Language name */
246 scm_printchar
, /* Print a character constant */
247 scm_printstr
, /* Function to print string constant */
248 NULL
, /* Function to print a single character */
249 NULL
, /* Create fundamental type in this language */
250 c_print_type
, /* Print a type using appropriate syntax */
251 scm_val_print
, /* Print a value using appropriate syntax */
252 scm_value_print
, /* Print a top-level value */
253 NULL
, /* Language specific skip_trampoline */
254 {"", "", "", ""}, /* Binary format info */
255 {"#o%lo", "#o", "o", ""}, /* Octal format info */
256 {"%ld", "", "d", ""}, /* Decimal format info */
257 {"#x%lX", "#X", "X", ""}, /* Hex format info */
258 NULL
, /* expression operators for printing */
259 1, /* c-style arrays */
260 0, /* String lower bound */
261 &builtin_type_char
, /* Type of string elements */
266 _initialize_scheme_language (void)
268 add_language (&scm_language_defn
);
269 builtin_type_scm
= init_type (TYPE_CODE_INT
,
270 TARGET_LONG_BIT
/ TARGET_CHAR_BIT
,
271 0, "SCM", (struct objfile
*) NULL
);