[deliverable/binutils-gdb.git] / gdb / scm-lang.c

/* 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"

extern void _initialize_scheme_language PARAMS ((void));
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);
}
Commit	Line	Data
c906108c SS	1	/* Scheme/Guile language support routines for GDB, the GNU debugger.
	2	Copyright 1995 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	19
	20	#include "defs.h"
	21	#include "symtab.h"
	22	#include "gdbtypes.h"
	23	#include "expression.h"
	24	#include "parser-defs.h"
	25	#include "language.h"
	26	#include "value.h"
	27	#include "c-lang.h"
	28	#include "scm-lang.h"
	29	#include "scm-tags.h"
	30	#include "gdb_string.h"
	31	#include "gdbcore.h"
	32
392a587b	33	extern void _initialize_scheme_language PARAMS ((void));
c906108c SS	34	static value_ptr evaluate_subexp_scm PARAMS ((struct type , struct expression ,
	35	int *, enum noside));
	36	static value_ptr scm_lookup_name PARAMS ((char *));
	37	static int in_eval_c PARAMS ((void));
	38	static void scm_printstr PARAMS ((GDB_FILE stream, char string, unsigned int length, int width, int force_ellipses));
	39
	40	extern struct type ** CONST_PTR (c_builtin_types[]);
	41
	42	struct type *builtin_type_scm;
	43
	44	void
	45	scm_printchar (c, stream)
	46	int c;
	47	GDB_FILE *stream;
	48	{
	49	fprintf_filtered (stream, "#\\%c", c);
	50	}
	51
	52	static void
	53	scm_printstr (stream, string, length, width, force_ellipses)
	54	GDB_FILE *stream;
	55	char *string;
	56	unsigned int length;
	57	int width;
	58	int force_ellipses;
	59	{
	60	fprintf_filtered (stream, "\"%s\"", string);
	61	}
	62
	63	int
	64	is_scmvalue_type (type)
	65	struct type *type;
	66	{
	67	if (TYPE_CODE (type) == TYPE_CODE_INT
	68	&& TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
	69	{
	70	return 1;
	71	}
	72	return 0;
	73	}
	74
	75	/* Get the INDEX'th SCM value, assuming SVALUE is the address
	76	of the 0'th one. */
	77
	78	LONGEST
	79	scm_get_field (svalue, index)
	80	LONGEST svalue;
	81	int index;
	82	{
	83	char buffer[20];
	84	read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
	85	buffer, TYPE_LENGTH (builtin_type_scm));
	86	return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
	87	}
	88
	89	/* Unpack a value of type TYPE in buffer VALADDR as an integer
	90	(if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
	91	or Boolean (CONTEXT == TYPE_CODE_BOOL). */
	92
	93	LONGEST
	94	scm_unpack (type, valaddr, context)
	95	struct type *type;
	96	char *valaddr;
	97	enum type_code context;
98	{
99	if (is_scmvalue_type (type))
100	{
101	LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
102	if (context == TYPE_CODE_BOOL)
103	{
104	if (svalue == SCM_BOOL_F)
105	return 0;
106	else
107	return 1;
108	}
109	switch (7 & (int) svalue)
110	{
111	case 2: case 6: /* fixnum */
112	return svalue >> 2;
113	case 4: /* other immediate value */
114	if (SCM_ICHRP (svalue)) /* character */
115	return SCM_ICHR (svalue);
116	else if (SCM_IFLAGP (svalue))
117	{
118	switch ((int) svalue)
119	{
120	#ifndef SICP
121	case SCM_EOL:
122	#endif
123	case SCM_BOOL_F:
124	return 0;
125	case SCM_BOOL_T:
126	return 1;
127	}
128	}
129	error ("Value can't be converted to integer.");
130	default:
131	return svalue;
132	}
133	}
134	else
135	return unpack_long (type, valaddr);
136	}
137
138	/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
139
140	static int
141	in_eval_c ()
142	{
143	if (current_source_symtab && current_source_symtab->filename)
144	{
145	char *filename = current_source_symtab->filename;
146	int len = strlen (filename);
147	if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
148	return 1;
149	}
150	return 0;
151	}
152
153	/* Lookup a value for the variable named STR.
154	First lookup in Scheme context (using the scm_lookup_cstr inferior
155	function), then try lookup_symbol for compiled variables. */
156
157	static value_ptr
158	scm_lookup_name (str)
159	char *str;
160	{
161	value_ptr args[3];
162	int len = strlen (str);
163	value_ptr func, val;
164	struct symbol *sym;
165	args[0] = value_allocate_space_in_inferior (len);
166	args[1] = value_from_longest (builtin_type_int, len);
167	write_memory (value_as_long (args[0]), str, len);
168
169	if (in_eval_c ()
170	&& (sym = lookup_symbol ("env",
171	expression_context_block,
172	VAR_NAMESPACE, (int *) NULL,
173	(struct symtab **) NULL)) != NULL)
174	args[2] = value_of_variable (sym, expression_context_block);
175	else
176	/* FIXME in this case, we should try lookup_symbol first */
177	args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
178
179	func = find_function_in_inferior ("scm_lookup_cstr");
180	val = call_function_by_hand (func, 3, args);
181	if (!value_logical_not (val))
182	return value_ind (val);
183
184	sym = lookup_symbol (str,
185	expression_context_block,
186	VAR_NAMESPACE, (int *) NULL,
187	(struct symtab **) NULL);
188	if (sym)
189	return value_of_variable (sym, NULL);
190	error ("No symbol \"%s\" in current context.");
191	}
192
193	value_ptr
194	scm_evaluate_string (str, len)
195	char *str; int len;
196	{
197	value_ptr func;
198	value_ptr addr = value_allocate_space_in_inferior (len + 1);
199	LONGEST iaddr = value_as_long (addr);
200	write_memory (iaddr, str, len);
201	/* FIXME - should find and pass env */
202	write_memory (iaddr + len, "", 1);
203	func = find_function_in_inferior ("scm_evstr");
204	return call_function_by_hand (func, 1, &addr);
205	}
206
207	static value_ptr
208	evaluate_subexp_scm (expect_type, exp, pos, noside)
209	struct type *expect_type;
210	register struct expression *exp;
211	register int *pos;
212	enum noside noside;
213	{
214	enum exp_opcode op = exp->elts[*pos].opcode;
215	int len, pc; char *str;
216	switch (op)
217	{
218	case OP_NAME:
219	pc = (*pos)++;
220	len = longest_to_int (exp->elts[pc + 1].longconst);
221	(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
222	if (noside == EVAL_SKIP)
223	goto nosideret;
224	str = &exp->elts[pc + 2].string;
225	return scm_lookup_name (str);
226	case OP_EXPRSTRING:
227	pc = (*pos)++;
228	len = longest_to_int (exp->elts[pc + 1].longconst);
229	(*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
230	if (noside == EVAL_SKIP)
231	goto nosideret;
232	str = &exp->elts[pc + 2].string;
233	return scm_evaluate_string (str, len);
234	default: ;
235	}
236	return evaluate_subexp_standard (expect_type, exp, pos, noside);
237	nosideret:
238	return value_from_longest (builtin_type_long, (LONGEST) 1);
239	}
240
241	const struct language_defn scm_language_defn = {
242	"scheme", /* Language name */
243	language_scm,
244	c_builtin_types,
245	range_check_off,
246	type_check_off,
247	scm_parse,
248	c_error,
249	evaluate_subexp_scm,
250	scm_printchar, /* Print a character constant */
251	scm_printstr, /* Function to print string constant */
252	NULL, /* Function to print a single character */
253	NULL, /* Create fundamental type in this language */
254	c_print_type, /* Print a type using appropriate syntax */
255	scm_val_print, /* Print a value using appropriate syntax */
256	scm_value_print, /* Print a top-level value */
257	{"", "", "", ""}, /* Binary format info */
258	{"#o%lo", "#o", "o", ""}, /* Octal format info */
259	{"%ld", "", "d", ""}, /* Decimal format info */
260	{"#x%lX", "#X", "X", ""}, /* Hex format info */
261	NULL, /* expression operators for printing */
262	1, /* c-style arrays */
263	0, /* String lower bound */
264	&builtin_type_char, /* Type of string elements */
265	LANG_MAGIC
266	};
267
268	void
269	_initialize_scheme_language ()
270	{
271	add_language (&scm_language_defn);
272	builtin_type_scm = init_type (TYPE_CODE_INT,
273	TARGET_LONG_BIT / TARGET_CHAR_BIT,
274	0, "SCM", (struct objfile *) NULL);
275	}