281 lines
7.7 KiB
C
281 lines
7.7 KiB
C
/* Scheme/Guile language support routines for GDB, the GNU debugger.
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Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007,
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2008 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "parser-defs.h"
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#include "language.h"
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#include "value.h"
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#include "c-lang.h"
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#include "scm-lang.h"
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#include "scm-tags.h"
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#include "source.h"
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#include "gdb_string.h"
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#include "gdbcore.h"
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#include "infcall.h"
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extern void _initialize_scheme_language (void);
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static struct value *evaluate_subexp_scm (struct type *, struct expression *,
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int *, enum noside);
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static struct value *scm_lookup_name (char *);
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static int in_eval_c (void);
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struct type *builtin_type_scm;
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void
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scm_printchar (int c, struct ui_file *stream)
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{
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fprintf_filtered (stream, "#\\%c", c);
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}
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static void
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scm_printstr (struct ui_file *stream, const gdb_byte *string,
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unsigned int length, int width, int force_ellipses)
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{
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fprintf_filtered (stream, "\"%s\"", string);
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}
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int
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is_scmvalue_type (struct type *type)
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{
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if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
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{
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return 1;
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}
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return 0;
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}
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/* Get the INDEX'th SCM value, assuming SVALUE is the address
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of the 0'th one. */
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LONGEST
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scm_get_field (LONGEST svalue, int index)
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{
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gdb_byte buffer[20];
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read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
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buffer, TYPE_LENGTH (builtin_type_scm));
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return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
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}
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/* Unpack a value of type TYPE in buffer VALADDR as an integer
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(if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
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or Boolean (CONTEXT == TYPE_CODE_BOOL). */
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LONGEST
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scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context)
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{
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if (is_scmvalue_type (type))
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{
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LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
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if (context == TYPE_CODE_BOOL)
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{
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if (svalue == SCM_BOOL_F)
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return 0;
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else
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return 1;
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}
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switch (7 & (int) svalue)
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{
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case 2:
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case 6: /* fixnum */
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return svalue >> 2;
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case 4: /* other immediate value */
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if (SCM_ICHRP (svalue)) /* character */
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return SCM_ICHR (svalue);
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else if (SCM_IFLAGP (svalue))
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{
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switch ((int) svalue)
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{
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#ifndef SICP
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case SCM_EOL:
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#endif
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case SCM_BOOL_F:
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return 0;
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case SCM_BOOL_T:
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return 1;
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}
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}
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error (_("Value can't be converted to integer."));
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default:
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return svalue;
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}
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}
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else
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return unpack_long (type, valaddr);
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}
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/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
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static int
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in_eval_c (void)
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{
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struct symtab_and_line cursal = get_current_source_symtab_and_line ();
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if (cursal.symtab && cursal.symtab->filename)
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{
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char *filename = cursal.symtab->filename;
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int len = strlen (filename);
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if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
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return 1;
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}
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return 0;
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}
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/* Lookup a value for the variable named STR.
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First lookup in Scheme context (using the scm_lookup_cstr inferior
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function), then try lookup_symbol for compiled variables. */
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static struct value *
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scm_lookup_name (char *str)
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{
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struct value *args[3];
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int len = strlen (str);
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struct value *func;
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struct value *val;
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struct symbol *sym;
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args[0] = value_allocate_space_in_inferior (len);
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args[1] = value_from_longest (builtin_type_int, len);
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write_memory (value_as_long (args[0]), (gdb_byte *) str, len);
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if (in_eval_c ()
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&& (sym = lookup_symbol ("env",
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expression_context_block,
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VAR_DOMAIN, (int *) NULL,
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(struct symtab **) NULL)) != NULL)
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args[2] = value_of_variable (sym, expression_context_block);
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else
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/* FIXME in this case, we should try lookup_symbol first */
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args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
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func = find_function_in_inferior ("scm_lookup_cstr");
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val = call_function_by_hand (func, 3, args);
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if (!value_logical_not (val))
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return value_ind (val);
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sym = lookup_symbol (str,
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expression_context_block,
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VAR_DOMAIN, (int *) NULL,
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(struct symtab **) NULL);
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if (sym)
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return value_of_variable (sym, NULL);
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error (_("No symbol \"%s\" in current context."), str);
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}
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struct value *
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scm_evaluate_string (char *str, int len)
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{
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struct value *func;
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struct value *addr = value_allocate_space_in_inferior (len + 1);
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LONGEST iaddr = value_as_long (addr);
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write_memory (iaddr, (gdb_byte *) str, len);
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/* FIXME - should find and pass env */
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write_memory (iaddr + len, (gdb_byte *) "", 1);
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func = find_function_in_inferior ("scm_evstr");
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return call_function_by_hand (func, 1, &addr);
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}
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static struct value *
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evaluate_exp (struct type *expect_type, struct expression *exp,
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int *pos, enum noside noside)
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{
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enum exp_opcode op = exp->elts[*pos].opcode;
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int len, pc;
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char *str;
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switch (op)
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{
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case OP_NAME:
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pc = (*pos)++;
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len = longest_to_int (exp->elts[pc + 1].longconst);
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(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
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if (noside == EVAL_SKIP)
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goto nosideret;
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str = &exp->elts[pc + 2].string;
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return scm_lookup_name (str);
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case OP_STRING:
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pc = (*pos)++;
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len = longest_to_int (exp->elts[pc + 1].longconst);
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(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
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if (noside == EVAL_SKIP)
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goto nosideret;
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str = &exp->elts[pc + 2].string;
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return scm_evaluate_string (str, len);
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default:;
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}
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return evaluate_subexp_standard (expect_type, exp, pos, noside);
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nosideret:
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return value_from_longest (builtin_type_long, (LONGEST) 1);
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}
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const struct exp_descriptor exp_descriptor_scm =
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{
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print_subexp_standard,
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operator_length_standard,
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op_name_standard,
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dump_subexp_body_standard,
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evaluate_exp
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};
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const struct language_defn scm_language_defn =
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{
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"scheme", /* Language name */
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language_scm,
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range_check_off,
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type_check_off,
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case_sensitive_off,
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array_row_major,
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&exp_descriptor_scm,
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scm_parse,
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c_error,
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null_post_parser,
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scm_printchar, /* Print a character constant */
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scm_printstr, /* Function to print string constant */
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NULL, /* Function to print a single character */
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c_print_type, /* Print a type using appropriate syntax */
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scm_val_print, /* Print a value using appropriate syntax */
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scm_value_print, /* Print a top-level value */
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NULL, /* Language specific skip_trampoline */
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value_of_this, /* value_of_this */
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basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
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basic_lookup_transparent_type,/* lookup_transparent_type */
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NULL, /* Language specific symbol demangler */
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NULL, /* Language specific class_name_from_physname */
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NULL, /* expression operators for printing */
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1, /* c-style arrays */
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0, /* String lower bound */
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default_word_break_characters,
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default_make_symbol_completion_list,
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c_language_arch_info,
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default_print_array_index,
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default_pass_by_reference,
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LANG_MAGIC
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};
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void
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_initialize_scheme_language (void)
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{
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add_language (&scm_language_defn);
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builtin_type_scm =
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init_type (TYPE_CODE_INT,
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gdbarch_long_bit (current_gdbarch) / TARGET_CHAR_BIT,
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0, "SCM", (struct objfile *) NULL);
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}
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