1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
3 Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007,
4 2008 Free Software 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 3 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, see <http://www.gnu.org/licenses/>. */
24 #include "expression.h"
25 #include "parser-defs.h"
32 #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);
43 struct type *builtin_type_scm;
46 scm_printchar (int c, struct ui_file *stream)
48 fprintf_filtered (stream, "#\\%c", c);
52 scm_printstr (struct ui_file *stream, const gdb_byte *string,
53 unsigned int length, int width, int force_ellipses)
55 fprintf_filtered (stream, "\"%s\"", string);
59 is_scmvalue_type (struct type *type)
61 if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
68 /* Get the INDEX'th SCM value, assuming SVALUE is the address
72 scm_get_field (LONGEST svalue, int index)
75 read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
76 buffer, TYPE_LENGTH (builtin_type_scm));
77 return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
80 /* Unpack a value of type TYPE in buffer VALADDR as an integer
81 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
82 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
85 scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context)
87 if (is_scmvalue_type (type))
89 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
90 if (context == TYPE_CODE_BOOL)
92 if (svalue == SCM_BOOL_F)
97 switch (7 & (int) svalue)
102 case 4: /* other immediate value */
103 if (SCM_ICHRP (svalue)) /* character */
104 return SCM_ICHR (svalue);
105 else if (SCM_IFLAGP (svalue))
107 switch ((int) svalue)
118 error (_("Value can't be converted to integer."));
124 return unpack_long (type, valaddr);
127 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
132 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
134 if (cursal.symtab && cursal.symtab->filename)
136 char *filename = cursal.symtab->filename;
137 int len = strlen (filename);
138 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
144 /* Lookup a value for the variable named STR.
145 First lookup in Scheme context (using the scm_lookup_cstr inferior
146 function), then try lookup_symbol for compiled variables. */
148 static struct value *
149 scm_lookup_name (char *str)
151 struct objfile *objf;
152 struct gdbarch *gdbarch;
153 struct value *args[3];
154 int len = strlen (str);
159 func = find_function_in_inferior ("scm_lookup_cstr", &objf);
160 gdbarch = get_objfile_arch (objf);
162 args[0] = value_allocate_space_in_inferior (len);
163 args[1] = value_from_longest (builtin_type (gdbarch)->builtin_int, len);
164 write_memory (value_as_long (args[0]), (gdb_byte *) str, len);
167 && (sym = lookup_symbol ("env",
168 expression_context_block,
169 VAR_DOMAIN, (int *) 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 val = call_function_by_hand (func, 3, args);
176 if (!value_logical_not (val))
177 return value_ind (val);
179 sym = lookup_symbol (str,
180 expression_context_block,
181 VAR_DOMAIN, (int *) NULL);
183 return value_of_variable (sym, NULL);
184 error (_("No symbol \"%s\" in current context."), str);
188 scm_evaluate_string (char *str, int len)
191 struct value *addr = value_allocate_space_in_inferior (len + 1);
192 LONGEST iaddr = value_as_long (addr);
193 write_memory (iaddr, (gdb_byte *) str, len);
194 /* FIXME - should find and pass env */
195 write_memory (iaddr + len, (gdb_byte *) "", 1);
196 func = find_function_in_inferior ("scm_evstr", NULL);
197 return call_function_by_hand (func, 1, &addr);
200 static struct value *
201 evaluate_exp (struct type *expect_type, struct expression *exp,
202 int *pos, enum noside noside)
204 enum exp_opcode op = exp->elts[*pos].opcode;
211 len = longest_to_int (exp->elts[pc + 1].longconst);
212 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
213 if (noside == EVAL_SKIP)
215 str = &exp->elts[pc + 2].string;
216 return scm_lookup_name (str);
219 len = longest_to_int (exp->elts[pc + 1].longconst);
220 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
221 if (noside == EVAL_SKIP)
223 str = &exp->elts[pc + 2].string;
224 return scm_evaluate_string (str, len);
227 return evaluate_subexp_standard (expect_type, exp, pos, noside);
229 return value_from_longest (builtin_type_int8, (LONGEST) 1);
232 const struct exp_descriptor exp_descriptor_scm =
234 print_subexp_standard,
235 operator_length_standard,
237 dump_subexp_body_standard,
241 const struct language_defn scm_language_defn =
243 "scheme", /* Language name */
253 scm_printchar, /* Print a character constant */
254 scm_printstr, /* Function to print string constant */
255 NULL, /* Function to print a single character */
256 c_print_type, /* Print a type using appropriate syntax */
257 default_print_typedef, /* Print a typedef using appropriate syntax */
258 scm_val_print, /* Print a value using appropriate syntax */
259 scm_value_print, /* Print a top-level value */
260 NULL, /* Language specific skip_trampoline */
261 NULL, /* name_of_this */
262 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
263 basic_lookup_transparent_type,/* lookup_transparent_type */
264 NULL, /* Language specific symbol demangler */
265 NULL, /* Language specific class_name_from_physname */
266 NULL, /* expression operators for printing */
267 1, /* c-style arrays */
268 0, /* String lower bound */
269 default_word_break_characters,
270 default_make_symbol_completion_list,
271 c_language_arch_info,
272 default_print_array_index,
273 default_pass_by_reference,
278 _initialize_scheme_language (void)
280 add_language (&scm_language_defn);
282 init_type (TYPE_CODE_INT,
283 gdbarch_long_bit (current_gdbarch) / TARGET_CHAR_BIT,
284 0, "SCM", (struct objfile *) NULL);