1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
3 Copyright 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004 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"
38 extern void _initialize_scheme_language (void);
39 static struct value
*evaluate_subexp_scm (struct type
*, struct expression
*,
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
,
47 struct type
*builtin_type_scm
;
50 scm_printchar (int c
, struct ui_file
*stream
)
52 fprintf_filtered (stream
, "#\\%c", c
);
56 scm_printstr (struct ui_file
*stream
, char *string
, unsigned int length
,
57 int width
, int force_ellipses
)
59 fprintf_filtered (stream
, "\"%s\"", string
);
63 is_scmvalue_type (struct type
*type
)
65 if (TYPE_CODE (type
) == TYPE_CODE_INT
66 && TYPE_NAME (type
) && strcmp (TYPE_NAME (type
), "SCM") == 0)
73 /* Get the INDEX'th SCM value, assuming SVALUE is the address
77 scm_get_field (LONGEST svalue
, int index
)
80 read_memory (SCM2PTR (svalue
) + index
* TYPE_LENGTH (builtin_type_scm
),
81 buffer
, TYPE_LENGTH (builtin_type_scm
));
82 return extract_signed_integer (buffer
, TYPE_LENGTH (builtin_type_scm
));
85 /* Unpack a value of type TYPE in buffer VALADDR as an integer
86 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
87 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
90 scm_unpack (struct type
*type
, const char *valaddr
, enum type_code context
)
92 if (is_scmvalue_type (type
))
94 LONGEST svalue
= extract_signed_integer (valaddr
, TYPE_LENGTH (type
));
95 if (context
== TYPE_CODE_BOOL
)
97 if (svalue
== SCM_BOOL_F
)
102 switch (7 & (int) svalue
)
107 case 4: /* other immediate value */
108 if (SCM_ICHRP (svalue
)) /* character */
109 return SCM_ICHR (svalue
);
110 else if (SCM_IFLAGP (svalue
))
112 switch ((int) svalue
)
123 error ("Value can't be converted to integer.");
129 return unpack_long (type
, valaddr
);
132 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
137 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
139 if (cursal
.symtab
&& cursal
.symtab
->filename
)
141 char *filename
= cursal
.symtab
->filename
;
142 int len
= strlen (filename
);
143 if (len
>= 6 && strcmp (filename
+ len
- 6, "eval.c") == 0)
149 /* Lookup a value for the variable named STR.
150 First lookup in Scheme context (using the scm_lookup_cstr inferior
151 function), then try lookup_symbol for compiled variables. */
153 static struct value
*
154 scm_lookup_name (char *str
)
156 struct value
*args
[3];
157 int len
= strlen (str
);
161 args
[0] = value_allocate_space_in_inferior (len
);
162 args
[1] = value_from_longest (builtin_type_int
, len
);
163 write_memory (value_as_long (args
[0]), str
, len
);
166 && (sym
= lookup_symbol ("env",
167 expression_context_block
,
168 VAR_DOMAIN
, (int *) NULL
,
169 (struct symtab
**) NULL
)) != NULL
)
170 args
[2] = value_of_variable (sym
, expression_context_block
);
172 /* FIXME in this case, we should try lookup_symbol first */
173 args
[2] = value_from_longest (builtin_type_scm
, SCM_EOL
);
175 func
= find_function_in_inferior ("scm_lookup_cstr");
176 val
= call_function_by_hand (func
, 3, args
);
177 if (!value_logical_not (val
))
178 return value_ind (val
);
180 sym
= lookup_symbol (str
,
181 expression_context_block
,
182 VAR_DOMAIN
, (int *) NULL
,
183 (struct symtab
**) NULL
);
185 return value_of_variable (sym
, NULL
);
186 error ("No symbol \"%s\" in current context.", str
);
190 scm_evaluate_string (char *str
, int len
)
193 struct value
*addr
= value_allocate_space_in_inferior (len
+ 1);
194 LONGEST iaddr
= value_as_long (addr
);
195 write_memory (iaddr
, str
, len
);
196 /* FIXME - should find and pass env */
197 write_memory (iaddr
+ len
, "", 1);
198 func
= find_function_in_inferior ("scm_evstr");
199 return call_function_by_hand (func
, 1, &addr
);
202 static struct value
*
203 evaluate_subexp_scm (struct type
*expect_type
, struct expression
*exp
,
204 int *pos
, enum noside noside
)
206 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
213 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
214 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
215 if (noside
== EVAL_SKIP
)
217 str
= &exp
->elts
[pc
+ 2].string
;
218 return scm_lookup_name (str
);
221 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
222 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
223 if (noside
== EVAL_SKIP
)
225 str
= &exp
->elts
[pc
+ 2].string
;
226 return scm_evaluate_string (str
, len
);
229 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
231 return value_from_longest (builtin_type_long
, (LONGEST
) 1);
234 const struct exp_descriptor exp_descriptor_scm
=
236 print_subexp_standard
,
237 operator_length_standard
,
239 dump_subexp_body_standard
,
243 const struct language_defn scm_language_defn
=
245 "scheme", /* Language name */
256 scm_printchar
, /* Print a character constant */
257 scm_printstr
, /* Function to print string constant */
258 NULL
, /* Function to print a single character */
259 NULL
, /* Create fundamental type in this language */
260 c_print_type
, /* Print a type using appropriate syntax */
261 scm_val_print
, /* Print a value using appropriate syntax */
262 scm_value_print
, /* Print a top-level value */
263 NULL
, /* Language specific skip_trampoline */
264 value_of_this
, /* value_of_this */
265 basic_lookup_symbol_nonlocal
, /* lookup_symbol_nonlocal */
266 basic_lookup_transparent_type
,/* lookup_transparent_type */
267 NULL
, /* Language specific symbol demangler */
268 NULL
, /* Language specific class_name_from_physname */
269 NULL
, /* expression operators for printing */
270 1, /* c-style arrays */
271 0, /* String lower bound */
273 default_word_break_characters
,
274 c_language_arch_info
,
279 _initialize_scheme_language (void)
281 add_language (&scm_language_defn
);
282 builtin_type_scm
= init_type (TYPE_CODE_INT
,
283 TARGET_LONG_BIT
/ TARGET_CHAR_BIT
,
284 0, "SCM", (struct objfile
*) NULL
);