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-rw-r--r--gdb/scm-lang.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/gdb/scm-lang.c b/gdb/scm-lang.c
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+/* Scheme/Guile language support routines for GDB, the GNU debugger.
+ Copyright 1995 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "expression.h"
+#include "parser-defs.h"
+#include "language.h"
+#include "value.h"
+#include "c-lang.h"
+#include "scm-lang.h"
+#include "scm-tags.h"
+#include "gdb_string.h"
+#include "gdbcore.h"
+
+static value_ptr evaluate_subexp_scm PARAMS ((struct type *, struct expression *,
+ int *, enum noside));
+static value_ptr scm_lookup_name PARAMS ((char *));
+static int in_eval_c PARAMS ((void));
+static void scm_printstr PARAMS ((GDB_FILE *stream, char *string, unsigned int length, int width, int force_ellipses));
+
+extern struct type ** CONST_PTR (c_builtin_types[]);
+
+struct type *builtin_type_scm;
+
+void
+scm_printchar (c, stream)
+ int c;
+ GDB_FILE *stream;
+{
+ fprintf_filtered (stream, "#\\%c", c);
+}
+
+static void
+scm_printstr (stream, string, length, width, force_ellipses)
+ GDB_FILE *stream;
+ char *string;
+ unsigned int length;
+ int width;
+ int force_ellipses;
+{
+ fprintf_filtered (stream, "\"%s\"", string);
+}
+
+int
+is_scmvalue_type (type)
+ struct type *type;
+{
+ if (TYPE_CODE (type) == TYPE_CODE_INT
+ && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
+ {
+ return 1;
+ }
+ return 0;
+}
+
+/* Get the INDEX'th SCM value, assuming SVALUE is the address
+ of the 0'th one. */
+
+LONGEST
+scm_get_field (svalue, index)
+ LONGEST svalue;
+ int index;
+{
+ char buffer[20];
+ read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
+ buffer, TYPE_LENGTH (builtin_type_scm));
+ return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
+}
+
+/* Unpack a value of type TYPE in buffer VALADDR as an integer
+ (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
+ or Boolean (CONTEXT == TYPE_CODE_BOOL). */
+
+LONGEST
+scm_unpack (type, valaddr, context)
+ struct type *type;
+ char *valaddr;
+ enum type_code context;
+{
+ if (is_scmvalue_type (type))
+ {
+ LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
+ if (context == TYPE_CODE_BOOL)
+ {
+ if (svalue == SCM_BOOL_F)
+ return 0;
+ else
+ return 1;
+ }
+ switch (7 & (int) svalue)
+ {
+ case 2: case 6: /* fixnum */
+ return svalue >> 2;
+ case 4: /* other immediate value */
+ if (SCM_ICHRP (svalue)) /* character */
+ return SCM_ICHR (svalue);
+ else if (SCM_IFLAGP (svalue))
+ {
+ switch ((int) svalue)
+ {
+#ifndef SICP
+ case SCM_EOL:
+#endif
+ case SCM_BOOL_F:
+ return 0;
+ case SCM_BOOL_T:
+ return 1;
+ }
+ }
+ error ("Value can't be converted to integer.");
+ default:
+ return svalue;
+ }
+ }
+ else
+ return unpack_long (type, valaddr);
+}
+
+/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
+
+static int
+in_eval_c ()
+{
+ if (current_source_symtab && current_source_symtab->filename)
+ {
+ char *filename = current_source_symtab->filename;
+ int len = strlen (filename);
+ if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
+ return 1;
+ }
+ return 0;
+}
+
+/* Lookup a value for the variable named STR.
+ First lookup in Scheme context (using the scm_lookup_cstr inferior
+ function), then try lookup_symbol for compiled variables. */
+
+static value_ptr
+scm_lookup_name (str)
+ char *str;
+{
+ value_ptr args[3];
+ int len = strlen (str);
+ value_ptr func, val;
+ struct symbol *sym;
+ args[0] = value_allocate_space_in_inferior (len);
+ args[1] = value_from_longest (builtin_type_int, len);
+ write_memory (value_as_long (args[0]), str, len);
+
+ if (in_eval_c ()
+ && (sym = lookup_symbol ("env",
+ expression_context_block,
+ VAR_NAMESPACE, (int *) NULL,
+ (struct symtab **) NULL)) != NULL)
+ args[2] = value_of_variable (sym, expression_context_block);
+ else
+ /* FIXME in this case, we should try lookup_symbol first */
+ args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
+
+ func = find_function_in_inferior ("scm_lookup_cstr");
+ val = call_function_by_hand (func, 3, args);
+ if (!value_logical_not (val))
+ return value_ind (val);
+
+ sym = lookup_symbol (str,
+ expression_context_block,
+ VAR_NAMESPACE, (int *) NULL,
+ (struct symtab **) NULL);
+ if (sym)
+ return value_of_variable (sym, NULL);
+ error ("No symbol \"%s\" in current context.");
+}
+
+value_ptr
+scm_evaluate_string (str, len)
+ char *str; int len;
+{
+ value_ptr func;
+ value_ptr addr = value_allocate_space_in_inferior (len + 1);
+ LONGEST iaddr = value_as_long (addr);
+ write_memory (iaddr, str, len);
+ /* FIXME - should find and pass env */
+ write_memory (iaddr + len, "", 1);
+ func = find_function_in_inferior ("scm_evstr");
+ return call_function_by_hand (func, 1, &addr);
+}
+
+static value_ptr
+evaluate_subexp_scm (expect_type, exp, pos, noside)
+ struct type *expect_type;
+ register struct expression *exp;
+ register int *pos;
+ enum noside noside;
+{
+ enum exp_opcode op = exp->elts[*pos].opcode;
+ int len, pc; char *str;
+ switch (op)
+ {
+ case OP_NAME:
+ pc = (*pos)++;
+ len = longest_to_int (exp->elts[pc + 1].longconst);
+ (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
+ if (noside == EVAL_SKIP)
+ goto nosideret;
+ str = &exp->elts[pc + 2].string;
+ return scm_lookup_name (str);
+ case OP_EXPRSTRING:
+ pc = (*pos)++;
+ len = longest_to_int (exp->elts[pc + 1].longconst);
+ (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
+ if (noside == EVAL_SKIP)
+ goto nosideret;
+ str = &exp->elts[pc + 2].string;
+ return scm_evaluate_string (str, len);
+ default: ;
+ }
+ return evaluate_subexp_standard (expect_type, exp, pos, noside);
+ nosideret:
+ return value_from_longest (builtin_type_long, (LONGEST) 1);
+}
+
+const struct language_defn scm_language_defn = {
+ "scheme", /* Language name */
+ language_scm,
+ c_builtin_types,
+ range_check_off,
+ type_check_off,
+ scm_parse,
+ c_error,
+ evaluate_subexp_scm,
+ scm_printchar, /* Print a character constant */
+ scm_printstr, /* Function to print string constant */
+ NULL, /* Function to print a single character */
+ NULL, /* Create fundamental type in this language */
+ c_print_type, /* Print a type using appropriate syntax */
+ scm_val_print, /* Print a value using appropriate syntax */
+ scm_value_print, /* Print a top-level value */
+ {"", "", "", ""}, /* Binary format info */
+ {"#o%lo", "#o", "o", ""}, /* Octal format info */
+ {"%ld", "", "d", ""}, /* Decimal format info */
+ {"#x%lX", "#X", "X", ""}, /* Hex format info */
+ NULL, /* expression operators for printing */
+ 1, /* c-style arrays */
+ 0, /* String lower bound */
+ &builtin_type_char, /* Type of string elements */
+ LANG_MAGIC
+};
+
+void
+_initialize_scheme_language ()
+{
+ add_language (&scm_language_defn);
+ builtin_type_scm = init_type (TYPE_CODE_INT,
+ TARGET_LONG_BIT / TARGET_CHAR_BIT,
+ 0, "SCM", (struct objfile *) NULL);
+}
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