1/* Java language support routines for GDB, the GNU debugger.
2
3   Copyright (C) 1997, 1998, 1999, 2000, 2003, 2004, 2005, 2007, 2008, 2009,
4   2010, 2011 Free Software Foundation, Inc.
5
6   This file is part of GDB.
7
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.
12
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.
17
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/>.  */
20
21#include "defs.h"
22#include "symtab.h"
23#include "gdbtypes.h"
24#include "expression.h"
25#include "parser-defs.h"
26#include "language.h"
27#include "gdbtypes.h"
28#include "symtab.h"
29#include "symfile.h"
30#include "objfiles.h"
31#include "gdb_string.h"
32#include "value.h"
33#include "c-lang.h"
34#include "jv-lang.h"
35#include "gdbcore.h"
36#include "block.h"
37#include "demangle.h"
38#include "dictionary.h"
39#include <ctype.h>
40#include "gdb_assert.h"
41
42/* Local functions */
43
44extern void _initialize_java_language (void);
45
46static int java_demangled_signature_length (char *);
47static void java_demangled_signature_copy (char *, char *);
48
49static struct symtab *get_java_class_symtab (struct gdbarch *gdbarch);
50static char *get_java_utf8_name (struct obstack *obstack, struct value *name);
51static int java_class_is_primitive (struct value *clas);
52static struct value *java_value_string (char *ptr, int len);
53
54static void java_emit_char (int c, struct type *type,
55			    struct ui_file * stream, int quoter);
56
57static char *java_class_name_from_physname (const char *physname);
58
59static const struct objfile_data *jv_dynamics_objfile_data_key;
60static const struct objfile_data *jv_type_objfile_data_key;
61
62/* This objfile contains symtabs that have been dynamically created
63   to record dynamically loaded Java classes and dynamically
64   compiled java methods.  */
65
66static struct objfile *dynamics_objfile = NULL;
67
68/* symtab contains classes read from the inferior.  */
69
70static struct symtab *class_symtab = NULL;
71
72static struct type *java_link_class_type (struct gdbarch *,
73					  struct type *, struct value *);
74
75/* A function called when the dynamics_objfile is freed.  We use this
76   to clean up some internal state.  */
77static void
78jv_per_objfile_free (struct objfile *objfile, void *ignore)
79{
80  gdb_assert (objfile == dynamics_objfile);
81  /* Clean up all our cached state.  These objects are all allocated
82     in the dynamics_objfile, so we don't need to actually free
83     anything.  */
84  dynamics_objfile = NULL;
85  class_symtab = NULL;
86}
87
88/* FIXME: carlton/2003-02-04: This is the main or only caller of
89   allocate_objfile with first argument NULL; as a result, this code
90   breaks every so often.  Somebody should write a test case that
91   exercises GDB in various ways (e.g. something involving loading a
92   dynamic library) after this code has been called.  */
93
94static struct objfile *
95get_dynamics_objfile (struct gdbarch *gdbarch)
96{
97  if (dynamics_objfile == NULL)
98    {
99      /* Mark it as shared so that it is cleared when the inferior is
100	 re-run.  */
101      dynamics_objfile = allocate_objfile (NULL, OBJF_SHARED);
102      dynamics_objfile->gdbarch = gdbarch;
103      /* We don't have any data to store, but this lets us get a
104	 notification when the objfile is destroyed.  Since we have to
105	 store a non-NULL value, we just pick something arbitrary and
106	 safe.  */
107      set_objfile_data (dynamics_objfile, jv_dynamics_objfile_data_key,
108			&dynamics_objfile);
109    }
110  return dynamics_objfile;
111}
112
113static void free_class_block (struct symtab *symtab);
114
115static struct symtab *
116get_java_class_symtab (struct gdbarch *gdbarch)
117{
118  if (class_symtab == NULL)
119    {
120      struct objfile *objfile = get_dynamics_objfile (gdbarch);
121      struct blockvector *bv;
122      struct block *bl;
123
124      class_symtab = allocate_symtab ("<java-classes>", objfile);
125      class_symtab->language = language_java;
126      bv = (struct blockvector *)
127	obstack_alloc (&objfile->objfile_obstack,
128		       sizeof (struct blockvector) + sizeof (struct block *));
129      BLOCKVECTOR_NBLOCKS (bv) = 1;
130      BLOCKVECTOR (class_symtab) = bv;
131
132      /* Allocate dummy STATIC_BLOCK.  */
133      bl = allocate_block (&objfile->objfile_obstack);
134      BLOCK_DICT (bl) = dict_create_linear (&objfile->objfile_obstack,
135					    NULL);
136      BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK) = bl;
137
138      /* Allocate GLOBAL_BLOCK.  */
139      bl = allocate_block (&objfile->objfile_obstack);
140      BLOCK_DICT (bl) = dict_create_hashed_expandable ();
141      BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK) = bl;
142      class_symtab->free_func = free_class_block;
143    }
144  return class_symtab;
145}
146
147static void
148add_class_symtab_symbol (struct symbol *sym)
149{
150  struct symtab *symtab
151    = get_java_class_symtab (get_objfile_arch (SYMBOL_SYMTAB (sym)->objfile));
152  struct blockvector *bv = BLOCKVECTOR (symtab);
153
154  dict_add_symbol (BLOCK_DICT (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK)), sym);
155}
156
157static struct symbol *
158add_class_symbol (struct type *type, CORE_ADDR addr)
159{
160  struct symbol *sym;
161
162  sym = (struct symbol *)
163    obstack_alloc (&dynamics_objfile->objfile_obstack, sizeof (struct symbol));
164  memset (sym, 0, sizeof (struct symbol));
165  SYMBOL_SET_LANGUAGE (sym, language_java);
166  SYMBOL_SET_LINKAGE_NAME (sym, TYPE_TAG_NAME (type));
167  SYMBOL_CLASS (sym) = LOC_TYPEDEF;
168  /*  SYMBOL_VALUE (sym) = valu; */
169  SYMBOL_TYPE (sym) = type;
170  SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
171  SYMBOL_VALUE_ADDRESS (sym) = addr;
172  return sym;
173}
174
175/* Free the dynamic symbols block.  */
176static void
177free_class_block (struct symtab *symtab)
178{
179  struct blockvector *bv = BLOCKVECTOR (symtab);
180  struct block *bl = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
181
182  dict_free (BLOCK_DICT (bl));
183}
184
185struct type *
186java_lookup_class (char *name)
187{
188  struct symbol *sym;
189
190  sym = lookup_symbol (name, expression_context_block, STRUCT_DOMAIN, NULL);
191  if (sym != NULL)
192    return SYMBOL_TYPE (sym);
193  /* FIXME - should search inferior's symbol table.  */
194  return NULL;
195}
196
197/* Return a nul-terminated string (allocated on OBSTACK) for
198   a name given by NAME (which has type Utf8Const*).  */
199
200char *
201get_java_utf8_name (struct obstack *obstack, struct value *name)
202{
203  char *chrs;
204  struct value *temp = name;
205  int name_length;
206  CORE_ADDR data_addr;
207
208  temp = value_struct_elt (&temp, NULL, "length", NULL, "structure");
209  name_length = (int) value_as_long (temp);
210  data_addr = value_address (temp) + TYPE_LENGTH (value_type (temp));
211  chrs = obstack_alloc (obstack, name_length + 1);
212  chrs[name_length] = '\0';
213  read_memory (data_addr, (gdb_byte *) chrs, name_length);
214  return chrs;
215}
216
217struct value *
218java_class_from_object (struct value *obj_val)
219{
220  /* This is all rather inefficient, since the offsets of vtable and
221     class are fixed.  FIXME */
222  struct value *vtable_val;
223
224  if (TYPE_CODE (value_type (obj_val)) == TYPE_CODE_PTR
225      && TYPE_LENGTH (TYPE_TARGET_TYPE (value_type (obj_val))) == 0)
226    obj_val = value_at (get_java_object_type (),
227			value_as_address (obj_val));
228
229  vtable_val = value_struct_elt (&obj_val, NULL, "vtable", NULL, "structure");
230  return value_struct_elt (&vtable_val, NULL, "class", NULL, "structure");
231}
232
233/* Check if CLASS_IS_PRIMITIVE(value of clas): */
234static int
235java_class_is_primitive (struct value *clas)
236{
237  struct value *vtable = value_struct_elt (&clas, NULL, "vtable",
238					   NULL, "struct");
239  CORE_ADDR i = value_as_address (vtable);
240
241  return (int) (i & 0x7fffffff) == (int) 0x7fffffff;
242}
243
244/* Read a GCJ Class object, and generated a gdb (TYPE_CODE_STRUCT) type.  */
245
246struct type *
247type_from_class (struct gdbarch *gdbarch, struct value *clas)
248{
249  struct type *type;
250  char *name;
251  struct value *temp;
252  struct objfile *objfile;
253  struct value *utf8_name;
254  char *nptr;
255  CORE_ADDR addr;
256  int is_array = 0;
257
258  type = check_typedef (value_type (clas));
259  if (TYPE_CODE (type) == TYPE_CODE_PTR)
260    {
261      if (value_logical_not (clas))
262	return NULL;
263      clas = value_ind (clas);
264    }
265  addr = value_address (clas);
266
267  objfile = get_dynamics_objfile (gdbarch);
268  if (java_class_is_primitive (clas))
269    {
270      struct value *sig;
271
272      temp = clas;
273      sig = value_struct_elt (&temp, NULL, "method_count", NULL, "structure");
274      return java_primitive_type (gdbarch, value_as_long (sig));
275    }
276
277  /* Get Class name.  */
278  /* If clasloader non-null, prepend loader address.  FIXME */
279  temp = clas;
280  utf8_name = value_struct_elt (&temp, NULL, "name", NULL, "structure");
281  name = get_java_utf8_name (&objfile->objfile_obstack, utf8_name);
282  for (nptr = name; *nptr != 0; nptr++)
283    {
284      if (*nptr == '/')
285	*nptr = '.';
286    }
287
288  type = java_lookup_class (name);
289  if (type != NULL)
290    return type;
291
292  type = alloc_type (objfile);
293  TYPE_CODE (type) = TYPE_CODE_STRUCT;
294  INIT_CPLUS_SPECIFIC (type);
295
296  if (name[0] == '[')
297    {
298      char *signature = name;
299      int namelen = java_demangled_signature_length (signature);
300
301      if (namelen > strlen (name))
302	name = obstack_alloc (&objfile->objfile_obstack, namelen + 1);
303      java_demangled_signature_copy (name, signature);
304      name[namelen] = '\0';
305      is_array = 1;
306      temp = clas;
307      /* Set array element type.  */
308      temp = value_struct_elt (&temp, NULL, "methods", NULL, "structure");
309      deprecated_set_value_type (temp,
310				 lookup_pointer_type (value_type (clas)));
311      TYPE_TARGET_TYPE (type) = type_from_class (gdbarch, temp);
312    }
313
314  ALLOCATE_CPLUS_STRUCT_TYPE (type);
315  TYPE_TAG_NAME (type) = name;
316
317  add_class_symtab_symbol (add_class_symbol (type, addr));
318  return java_link_class_type (gdbarch, type, clas);
319}
320
321/* Fill in class TYPE with data from the CLAS value.  */
322
323static struct type *
324java_link_class_type (struct gdbarch *gdbarch,
325		      struct type *type, struct value *clas)
326{
327  struct value *temp;
328  char *unqualified_name;
329  char *name = TYPE_TAG_NAME (type);
330  int ninterfaces, nfields, nmethods;
331  int type_is_object = 0;
332  struct fn_field *fn_fields;
333  struct fn_fieldlist *fn_fieldlists;
334  struct value *fields;
335  struct value *methods;
336  struct value *method = NULL;
337  struct value *field = NULL;
338  int i, j;
339  struct objfile *objfile = get_dynamics_objfile (gdbarch);
340  struct type *tsuper;
341
342  gdb_assert (name != NULL);
343  unqualified_name = strrchr (name, '.');
344  if (unqualified_name == NULL)
345    unqualified_name = name;
346
347  temp = clas;
348  temp = value_struct_elt (&temp, NULL, "superclass", NULL, "structure");
349  if (strcmp (name, "java.lang.Object") == 0)
350    {
351      tsuper = get_java_object_type ();
352      if (tsuper && TYPE_CODE (tsuper) == TYPE_CODE_PTR)
353	tsuper = TYPE_TARGET_TYPE (tsuper);
354      type_is_object = 1;
355    }
356  else
357    tsuper = type_from_class (gdbarch, temp);
358
359#if 1
360  ninterfaces = 0;
361#else
362  temp = clas;
363  ninterfaces = value_as_long (value_struct_elt (&temp, NULL, "interface_len",
364						 NULL, "structure"));
365#endif
366  TYPE_N_BASECLASSES (type) = (tsuper == NULL ? 0 : 1) + ninterfaces;
367  temp = clas;
368  nfields = value_as_long (value_struct_elt (&temp, NULL, "field_count",
369					     NULL, "structure"));
370  nfields += TYPE_N_BASECLASSES (type);
371  nfields++;			/* Add one for dummy "class" field.  */
372  TYPE_NFIELDS (type) = nfields;
373  TYPE_FIELDS (type) = (struct field *)
374    TYPE_ALLOC (type, sizeof (struct field) * nfields);
375
376  memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
377
378  TYPE_FIELD_PRIVATE_BITS (type) =
379    (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
380  B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
381
382  TYPE_FIELD_PROTECTED_BITS (type) =
383    (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
384  B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
385
386  TYPE_FIELD_IGNORE_BITS (type) =
387    (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
388  B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
389
390  TYPE_FIELD_VIRTUAL_BITS (type) = (B_TYPE *)
391    TYPE_ALLOC (type, B_BYTES (TYPE_N_BASECLASSES (type)));
392  B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), TYPE_N_BASECLASSES (type));
393
394  if (tsuper != NULL)
395    {
396      TYPE_BASECLASS (type, 0) = tsuper;
397      if (type_is_object)
398	SET_TYPE_FIELD_PRIVATE (type, 0);
399    }
400
401  i = strlen (name);
402  if (i > 2 && name[i - 1] == ']' && tsuper != NULL)
403    {
404      /* FIXME */
405      TYPE_LENGTH (type) = TYPE_LENGTH (tsuper) + 4;   /* size with "length" */
406    }
407  else
408    {
409      temp = clas;
410      temp = value_struct_elt (&temp, NULL, "size_in_bytes",
411			       NULL, "structure");
412      TYPE_LENGTH (type) = value_as_long (temp);
413    }
414
415  fields = NULL;
416  nfields--;			/* First set up dummy "class" field.  */
417  SET_FIELD_PHYSADDR (TYPE_FIELD (type, nfields), value_address (clas));
418  TYPE_FIELD_NAME (type, nfields) = "class";
419  TYPE_FIELD_TYPE (type, nfields) = value_type (clas);
420  SET_TYPE_FIELD_PRIVATE (type, nfields);
421
422  for (i = TYPE_N_BASECLASSES (type); i < nfields; i++)
423    {
424      int accflags;
425      int boffset;
426
427      if (fields == NULL)
428	{
429	  temp = clas;
430	  fields = value_struct_elt (&temp, NULL, "fields", NULL, "structure");
431	  field = value_ind (fields);
432	}
433      else
434	{			/* Re-use field value for next field.  */
435	  CORE_ADDR addr
436	    = value_address (field) + TYPE_LENGTH (value_type (field));
437
438	  set_value_address (field, addr);
439	  set_value_lazy (field, 1);
440	}
441      temp = field;
442      temp = value_struct_elt (&temp, NULL, "name", NULL, "structure");
443      TYPE_FIELD_NAME (type, i) =
444	get_java_utf8_name (&objfile->objfile_obstack, temp);
445      temp = field;
446      accflags = value_as_long (value_struct_elt (&temp, NULL, "accflags",
447						  NULL, "structure"));
448      temp = field;
449      temp = value_struct_elt (&temp, NULL, "info", NULL, "structure");
450      boffset = value_as_long (value_struct_elt (&temp, NULL, "boffset",
451						 NULL, "structure"));
452      if (accflags & 0x0001)	/* public access */
453	{
454	  /* ??? */
455	}
456      if (accflags & 0x0002)	/* private access */
457	{
458	  SET_TYPE_FIELD_PRIVATE (type, i);
459	}
460      if (accflags & 0x0004)	/* protected access */
461	{
462	  SET_TYPE_FIELD_PROTECTED (type, i);
463	}
464      if (accflags & 0x0008)	/* ACC_STATIC */
465	SET_FIELD_PHYSADDR (TYPE_FIELD (type, i), boffset);
466      else
467	TYPE_FIELD_BITPOS (type, i) = 8 * boffset;
468      if (accflags & 0x8000)	/* FIELD_UNRESOLVED_FLAG */
469	{
470	  TYPE_FIELD_TYPE (type, i) = get_java_object_type ();	/* FIXME */
471	}
472      else
473	{
474	  struct type *ftype;
475
476	  temp = field;
477	  temp = value_struct_elt (&temp, NULL, "type", NULL, "structure");
478	  ftype = type_from_class (gdbarch, temp);
479	  if (TYPE_CODE (ftype) == TYPE_CODE_STRUCT)
480	    ftype = lookup_pointer_type (ftype);
481	  TYPE_FIELD_TYPE (type, i) = ftype;
482	}
483    }
484
485  temp = clas;
486  nmethods = value_as_long (value_struct_elt (&temp, NULL, "method_count",
487					      NULL, "structure"));
488  TYPE_NFN_FIELDS_TOTAL (type) = nmethods;
489  j = nmethods * sizeof (struct fn_field);
490  fn_fields = (struct fn_field *)
491    obstack_alloc (&dynamics_objfile->objfile_obstack, j);
492  memset (fn_fields, 0, j);
493  fn_fieldlists = (struct fn_fieldlist *)
494    alloca (nmethods * sizeof (struct fn_fieldlist));
495
496  methods = NULL;
497  for (i = 0; i < nmethods; i++)
498    {
499      char *mname;
500      int k;
501
502      if (methods == NULL)
503	{
504	  temp = clas;
505	  methods = value_struct_elt (&temp, NULL, "methods",
506				      NULL, "structure");
507	  method = value_ind (methods);
508	}
509      else
510	{			/* Re-use method value for next method.  */
511	  CORE_ADDR addr
512	    = value_address (method) + TYPE_LENGTH (value_type (method));
513
514	  set_value_address (method, addr);
515	  set_value_lazy (method, 1);
516	}
517
518      /* Get method name.  */
519      temp = method;
520      temp = value_struct_elt (&temp, NULL, "name", NULL, "structure");
521      mname = get_java_utf8_name (&objfile->objfile_obstack, temp);
522      if (strcmp (mname, "<init>") == 0)
523	mname = unqualified_name;
524
525      /* Check for an existing method with the same name.
526       * This makes building the fn_fieldslists an O(nmethods**2)
527       * operation.  That could be using hashing, but I doubt it
528       * is worth it.  Note that we do maintain the order of methods
529       * in the inferior's Method table (as long as that is grouped
530       * by method name), which I think is desirable.  --PB */
531      for (k = 0, j = TYPE_NFN_FIELDS (type);;)
532	{
533	  if (--j < 0)
534	    {			/* No match - new method name.  */
535	      j = TYPE_NFN_FIELDS (type)++;
536	      fn_fieldlists[j].name = mname;
537	      fn_fieldlists[j].length = 1;
538	      fn_fieldlists[j].fn_fields = &fn_fields[i];
539	      k = i;
540	      break;
541	    }
542	  if (strcmp (mname, fn_fieldlists[j].name) == 0)
543	    {		/* Found an existing method with the same name.  */
544	      int l;
545
546	      if (mname != unqualified_name)
547		obstack_free (&objfile->objfile_obstack, mname);
548	      mname = fn_fieldlists[j].name;
549	      fn_fieldlists[j].length++;
550	      k = i - k;	/* Index of new slot.  */
551	      /* Shift intervening fn_fields (between k and i) down.  */
552	      for (l = i; l > k; l--)
553		fn_fields[l] = fn_fields[l - 1];
554	      for (l = TYPE_NFN_FIELDS (type); --l > j;)
555		fn_fieldlists[l].fn_fields++;
556	      break;
557	    }
558	  k += fn_fieldlists[j].length;
559	}
560      fn_fields[k].physname = "";
561      fn_fields[k].is_stub = 1;
562      /* FIXME */
563      fn_fields[k].type = lookup_function_type
564			   (builtin_java_type (gdbarch)->builtin_void);
565      TYPE_CODE (fn_fields[k].type) = TYPE_CODE_METHOD;
566    }
567
568  j = TYPE_NFN_FIELDS (type) * sizeof (struct fn_fieldlist);
569  TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
570    obstack_alloc (&dynamics_objfile->objfile_obstack, j);
571  memcpy (TYPE_FN_FIELDLISTS (type), fn_fieldlists, j);
572
573  return type;
574}
575
576static struct type *java_object_type;
577
578/* A free function that is attached to the objfile defining
579   java_object_type.  This is used to clear the cached type whenever
580   its owning objfile is destroyed.  */
581static void
582jv_clear_object_type (struct objfile *objfile, void *ignore)
583{
584  java_object_type = NULL;
585}
586
587static void
588set_java_object_type (struct type *type)
589{
590  struct objfile *owner;
591
592  gdb_assert (java_object_type == NULL);
593
594  owner = TYPE_OBJFILE (type);
595  if (owner)
596    set_objfile_data (owner, jv_type_objfile_data_key, &java_object_type);
597  java_object_type = type;
598}
599
600struct type *
601get_java_object_type (void)
602{
603  if (java_object_type == NULL)
604    {
605      struct symbol *sym;
606
607      sym = lookup_symbol ("java.lang.Object", NULL, STRUCT_DOMAIN, NULL);
608      if (sym == NULL)
609	error (_("cannot find java.lang.Object"));
610      set_java_object_type (SYMBOL_TYPE (sym));
611    }
612  return java_object_type;
613}
614
615int
616get_java_object_header_size (struct gdbarch *gdbarch)
617{
618  struct type *objtype = get_java_object_type ();
619
620  if (objtype == NULL)
621    return (2 * gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT);
622  else
623    return TYPE_LENGTH (objtype);
624}
625
626int
627is_object_type (struct type *type)
628{
629  CHECK_TYPEDEF (type);
630  if (TYPE_CODE (type) == TYPE_CODE_PTR)
631    {
632      struct type *ttype = check_typedef (TYPE_TARGET_TYPE (type));
633      char *name;
634      if (TYPE_CODE (ttype) != TYPE_CODE_STRUCT)
635	return 0;
636      while (TYPE_N_BASECLASSES (ttype) > 0)
637	ttype = TYPE_BASECLASS (ttype, 0);
638      name = TYPE_TAG_NAME (ttype);
639      if (name != NULL && strcmp (name, "java.lang.Object") == 0)
640	return 1;
641      name
642	= TYPE_NFIELDS (ttype) > 0 ? TYPE_FIELD_NAME (ttype, 0) : (char *) 0;
643      if (name != NULL && strcmp (name, "vtable") == 0)
644	{
645	  if (java_object_type == NULL)
646	    set_java_object_type (type);
647	  return 1;
648	}
649    }
650  return 0;
651}
652
653struct type *
654java_primitive_type (struct gdbarch *gdbarch, int signature)
655{
656  const struct builtin_java_type *builtin = builtin_java_type (gdbarch);
657
658  switch (signature)
659    {
660    case 'B':
661      return builtin->builtin_byte;
662    case 'S':
663      return builtin->builtin_short;
664    case 'I':
665      return builtin->builtin_int;
666    case 'J':
667      return builtin->builtin_long;
668    case 'Z':
669      return builtin->builtin_boolean;
670    case 'C':
671      return builtin->builtin_char;
672    case 'F':
673      return builtin->builtin_float;
674    case 'D':
675      return builtin->builtin_double;
676    case 'V':
677      return builtin->builtin_void;
678    }
679  error (_("unknown signature '%c' for primitive type"), (char) signature);
680}
681
682/* If name[0 .. namelen-1] is the name of a primitive Java type,
683   return that type.  Otherwise, return NULL.  */
684
685struct type *
686java_primitive_type_from_name (struct gdbarch *gdbarch,
687			       char *name, int namelen)
688{
689  const struct builtin_java_type *builtin = builtin_java_type (gdbarch);
690
691  switch (name[0])
692    {
693    case 'b':
694      if (namelen == 4 && memcmp (name, "byte", 4) == 0)
695	return builtin->builtin_byte;
696      if (namelen == 7 && memcmp (name, "boolean", 7) == 0)
697	return builtin->builtin_boolean;
698      break;
699    case 'c':
700      if (namelen == 4 && memcmp (name, "char", 4) == 0)
701	return builtin->builtin_char;
702      break;
703    case 'd':
704      if (namelen == 6 && memcmp (name, "double", 6) == 0)
705	return builtin->builtin_double;
706      break;
707    case 'f':
708      if (namelen == 5 && memcmp (name, "float", 5) == 0)
709	return builtin->builtin_float;
710      break;
711    case 'i':
712      if (namelen == 3 && memcmp (name, "int", 3) == 0)
713	return builtin->builtin_int;
714      break;
715    case 'l':
716      if (namelen == 4 && memcmp (name, "long", 4) == 0)
717	return builtin->builtin_long;
718      break;
719    case 's':
720      if (namelen == 5 && memcmp (name, "short", 5) == 0)
721	return builtin->builtin_short;
722      break;
723    case 'v':
724      if (namelen == 4 && memcmp (name, "void", 4) == 0)
725	return builtin->builtin_void;
726      break;
727    }
728  return NULL;
729}
730
731static char *
732java_primitive_type_name (int signature)
733{
734  switch (signature)
735    {
736    case 'B':
737      return "byte";
738    case 'S':
739      return "short";
740    case 'I':
741      return "int";
742    case 'J':
743      return "long";
744    case 'Z':
745      return "boolean";
746    case 'C':
747      return "char";
748    case 'F':
749      return "float";
750    case 'D':
751      return "double";
752    case 'V':
753      return "void";
754    }
755  error (_("unknown signature '%c' for primitive type"), (char) signature);
756}
757
758/* Return the length (in bytes) of demangled name of the Java type
759   signature string SIGNATURE.  */
760
761static int
762java_demangled_signature_length (char *signature)
763{
764  int array = 0;
765
766  for (; *signature == '['; signature++)
767    array += 2;			/* Two chars for "[]".  */
768  switch (signature[0])
769    {
770    case 'L':
771      /* Subtract 2 for 'L' and ';'.  */
772      return strlen (signature) - 2 + array;
773    default:
774      return strlen (java_primitive_type_name (signature[0])) + array;
775    }
776}
777
778/* Demangle the Java type signature SIGNATURE, leaving the result in
779   RESULT.  */
780
781static void
782java_demangled_signature_copy (char *result, char *signature)
783{
784  int array = 0;
785  char *ptr;
786  int i;
787
788  while (*signature == '[')
789    {
790      array++;
791      signature++;
792    }
793  switch (signature[0])
794    {
795    case 'L':
796      /* Subtract 2 for 'L' and ';', but add 1 for final nul.  */
797      signature++;
798      ptr = result;
799      for (; *signature != ';' && *signature != '\0'; signature++)
800	{
801	  if (*signature == '/')
802	    *ptr++ = '.';
803	  else
804	    *ptr++ = *signature;
805	}
806      break;
807    default:
808      ptr = java_primitive_type_name (signature[0]);
809      i = strlen (ptr);
810      strcpy (result, ptr);
811      ptr = result + i;
812      break;
813    }
814  while (--array >= 0)
815    {
816      *ptr++ = '[';
817      *ptr++ = ']';
818    }
819}
820
821/* Return the demangled name of the Java type signature string SIGNATURE,
822   as a freshly allocated copy.  */
823
824char *
825java_demangle_type_signature (char *signature)
826{
827  int length = java_demangled_signature_length (signature);
828  char *result = xmalloc (length + 1);
829
830  java_demangled_signature_copy (result, signature);
831  result[length] = '\0';
832  return result;
833}
834
835/* Return the type of TYPE followed by DIMS pairs of [ ].
836   If DIMS == 0, TYPE is returned.  */
837
838struct type *
839java_array_type (struct type *type, int dims)
840{
841  while (dims-- > 0)
842    {
843      /* FIXME  This is bogus!  Java arrays are not gdb arrays!  */
844      type = lookup_array_range_type (type, 0, 0);
845    }
846
847  return type;
848}
849
850/* Create a Java string in the inferior from a (Utf8) literal.  */
851
852static struct value *
853java_value_string (char *ptr, int len)
854{
855  error (_("not implemented - java_value_string"));	/* FIXME */
856}
857
858/* Print the character C on STREAM as part of the contents of a literal
859   string whose delimiter is QUOTER.  Note that that format for printing
860   characters and strings is language specific.  */
861
862static void
863java_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
864{
865  switch (c)
866    {
867    case '\\':
868    case '\'':
869      fprintf_filtered (stream, "\\%c", c);
870      break;
871    case '\b':
872      fputs_filtered ("\\b", stream);
873      break;
874    case '\t':
875      fputs_filtered ("\\t", stream);
876      break;
877    case '\n':
878      fputs_filtered ("\\n", stream);
879      break;
880    case '\f':
881      fputs_filtered ("\\f", stream);
882      break;
883    case '\r':
884      fputs_filtered ("\\r", stream);
885      break;
886    default:
887      if (isprint (c))
888	fputc_filtered (c, stream);
889      else
890	fprintf_filtered (stream, "\\u%.4x", (unsigned int) c);
891      break;
892    }
893}
894
895static struct value *
896evaluate_subexp_java (struct type *expect_type, struct expression *exp,
897		      int *pos, enum noside noside)
898{
899  int pc = *pos;
900  int i;
901  char *name;
902  enum exp_opcode op = exp->elts[*pos].opcode;
903  struct value *arg1;
904  struct value *arg2;
905  struct type *type;
906
907  switch (op)
908    {
909    case UNOP_IND:
910      if (noside == EVAL_SKIP)
911	goto standard;
912      (*pos)++;
913      arg1 = evaluate_subexp_java (NULL_TYPE, exp, pos, EVAL_NORMAL);
914      if (is_object_type (value_type (arg1)))
915	{
916	  struct type *type;
917
918	  type = type_from_class (exp->gdbarch, java_class_from_object (arg1));
919	  arg1 = value_cast (lookup_pointer_type (type), arg1);
920	}
921      return value_ind (arg1);
922
923    case BINOP_SUBSCRIPT:
924      (*pos)++;
925      arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
926      arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
927      if (noside == EVAL_SKIP)
928	goto nosideret;
929      /* If the user attempts to subscript something that is not an
930         array or pointer type (like a plain int variable for example),
931         then report this as an error.  */
932
933      arg1 = coerce_ref (arg1);
934      type = check_typedef (value_type (arg1));
935      if (TYPE_CODE (type) == TYPE_CODE_PTR)
936	type = check_typedef (TYPE_TARGET_TYPE (type));
937      name = TYPE_NAME (type);
938      if (name == NULL)
939	name = TYPE_TAG_NAME (type);
940      i = name == NULL ? 0 : strlen (name);
941      if (TYPE_CODE (type) == TYPE_CODE_STRUCT
942	  && i > 2 && name[i - 1] == ']')
943	{
944	  enum bfd_endian byte_order = gdbarch_byte_order (exp->gdbarch);
945	  CORE_ADDR address;
946	  long length, index;
947	  struct type *el_type;
948	  gdb_byte buf4[4];
949
950	  struct value *clas = java_class_from_object (arg1);
951	  struct value *temp = clas;
952	  /* Get CLASS_ELEMENT_TYPE of the array type.  */
953	  temp = value_struct_elt (&temp, NULL, "methods",
954				   NULL, "structure");
955	  deprecated_set_value_type (temp, value_type (clas));
956	  el_type = type_from_class (exp->gdbarch, temp);
957	  if (TYPE_CODE (el_type) == TYPE_CODE_STRUCT)
958	    el_type = lookup_pointer_type (el_type);
959
960	  if (noside == EVAL_AVOID_SIDE_EFFECTS)
961	    return value_zero (el_type, VALUE_LVAL (arg1));
962	  address = value_as_address (arg1);
963	  address += get_java_object_header_size (exp->gdbarch);
964	  read_memory (address, buf4, 4);
965	  length = (long) extract_signed_integer (buf4, 4, byte_order);
966	  index = (long) value_as_long (arg2);
967	  if (index >= length || index < 0)
968	    error (_("array index (%ld) out of bounds (length: %ld)"),
969		   index, length);
970	  address = (address + 4) + index * TYPE_LENGTH (el_type);
971	  return value_at (el_type, address);
972	}
973      else if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
974	{
975	  if (noside == EVAL_AVOID_SIDE_EFFECTS)
976	    return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
977	  else
978	    return value_subscript (arg1, value_as_long (arg2));
979	}
980      if (name)
981	error (_("cannot subscript something of type `%s'"), name);
982      else
983	error (_("cannot subscript requested type"));
984
985    case OP_STRING:
986      (*pos)++;
987      i = longest_to_int (exp->elts[pc + 1].longconst);
988      (*pos) += 3 + BYTES_TO_EXP_ELEM (i + 1);
989      if (noside == EVAL_SKIP)
990	goto nosideret;
991      return java_value_string (&exp->elts[pc + 2].string, i);
992
993    case STRUCTOP_PTR:
994      arg1 = evaluate_subexp_standard (expect_type, exp, pos, noside);
995      /* Convert object field (such as TYPE.class) to reference.  */
996      if (TYPE_CODE (value_type (arg1)) == TYPE_CODE_STRUCT)
997	arg1 = value_addr (arg1);
998      return arg1;
999    default:
1000      break;
1001    }
1002standard:
1003  return evaluate_subexp_standard (expect_type, exp, pos, noside);
1004nosideret:
1005  return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
1006}
1007
1008static char *java_demangle (const char *mangled, int options)
1009{
1010  return cplus_demangle (mangled, options | DMGL_JAVA);
1011}
1012
1013/* Find the member function name of the demangled name NAME.  NAME
1014   must be a method name including arguments, in order to correctly
1015   locate the last component.
1016
1017   This function return a pointer to the first dot before the
1018   member function name, or NULL if the name was not of the
1019   expected form.  */
1020
1021static const char *
1022java_find_last_component (const char *name)
1023{
1024  const char *p;
1025
1026  /* Find argument list.  */
1027  p = strchr (name, '(');
1028
1029  if (p == NULL)
1030    return NULL;
1031
1032  /* Back up and find first dot prior to argument list.  */
1033  while (p > name && *p != '.')
1034    p--;
1035
1036  if (p == name)
1037    return NULL;
1038
1039  return p;
1040}
1041
1042/* Return the name of the class containing method PHYSNAME.  */
1043
1044static char *
1045java_class_name_from_physname (const char *physname)
1046{
1047  char *ret = NULL;
1048  const char *end;
1049  char *demangled_name = java_demangle (physname, DMGL_PARAMS | DMGL_ANSI);
1050
1051  if (demangled_name == NULL)
1052    return NULL;
1053
1054  end = java_find_last_component (demangled_name);
1055  if (end != NULL)
1056    {
1057      ret = xmalloc (end - demangled_name + 1);
1058      memcpy (ret, demangled_name, end - demangled_name);
1059      ret[end - demangled_name] = '\0';
1060    }
1061
1062  xfree (demangled_name);
1063  return ret;
1064}
1065
1066/* Table mapping opcodes into strings for printing operators
1067   and precedences of the operators.  */
1068
1069const struct op_print java_op_print_tab[] =
1070{
1071  {",", BINOP_COMMA, PREC_COMMA, 0},
1072  {"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
1073  {"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
1074  {"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
1075  {"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},
1076  {"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},
1077  {"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0},
1078  {"==", BINOP_EQUAL, PREC_EQUAL, 0},
1079  {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0},
1080  {"<=", BINOP_LEQ, PREC_ORDER, 0},
1081  {">=", BINOP_GEQ, PREC_ORDER, 0},
1082  {">", BINOP_GTR, PREC_ORDER, 0},
1083  {"<", BINOP_LESS, PREC_ORDER, 0},
1084  {">>", BINOP_RSH, PREC_SHIFT, 0},
1085  {"<<", BINOP_LSH, PREC_SHIFT, 0},
1086  {"+", BINOP_ADD, PREC_ADD, 0},
1087  {"-", BINOP_SUB, PREC_ADD, 0},
1088  {"*", BINOP_MUL, PREC_MUL, 0},
1089  {"/", BINOP_DIV, PREC_MUL, 0},
1090  {"%", BINOP_REM, PREC_MUL, 0},
1091  {"-", UNOP_NEG, PREC_PREFIX, 0},
1092  {"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
1093  {"~", UNOP_COMPLEMENT, PREC_PREFIX, 0},
1094  {"*", UNOP_IND, PREC_PREFIX, 0},
1095  {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0},
1096  {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0},
1097  {NULL, 0, 0, 0}
1098};
1099
1100enum java_primitive_types
1101{
1102  java_primitive_type_int,
1103  java_primitive_type_short,
1104  java_primitive_type_long,
1105  java_primitive_type_byte,
1106  java_primitive_type_boolean,
1107  java_primitive_type_char,
1108  java_primitive_type_float,
1109  java_primitive_type_double,
1110  java_primitive_type_void,
1111  nr_java_primitive_types
1112};
1113
1114static void
1115java_language_arch_info (struct gdbarch *gdbarch,
1116			 struct language_arch_info *lai)
1117{
1118  const struct builtin_java_type *builtin = builtin_java_type (gdbarch);
1119
1120  lai->string_char_type = builtin->builtin_char;
1121  lai->primitive_type_vector
1122    = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_java_primitive_types + 1,
1123                              struct type *);
1124  lai->primitive_type_vector [java_primitive_type_int]
1125    = builtin->builtin_int;
1126  lai->primitive_type_vector [java_primitive_type_short]
1127    = builtin->builtin_short;
1128  lai->primitive_type_vector [java_primitive_type_long]
1129    = builtin->builtin_long;
1130  lai->primitive_type_vector [java_primitive_type_byte]
1131    = builtin->builtin_byte;
1132  lai->primitive_type_vector [java_primitive_type_boolean]
1133    = builtin->builtin_boolean;
1134  lai->primitive_type_vector [java_primitive_type_char]
1135    = builtin->builtin_char;
1136  lai->primitive_type_vector [java_primitive_type_float]
1137    = builtin->builtin_float;
1138  lai->primitive_type_vector [java_primitive_type_double]
1139    = builtin->builtin_double;
1140  lai->primitive_type_vector [java_primitive_type_void]
1141    = builtin->builtin_void;
1142
1143  lai->bool_type_symbol = "boolean";
1144  lai->bool_type_default = builtin->builtin_boolean;
1145}
1146
1147const struct exp_descriptor exp_descriptor_java =
1148{
1149  print_subexp_standard,
1150  operator_length_standard,
1151  operator_check_standard,
1152  op_name_standard,
1153  dump_subexp_body_standard,
1154  evaluate_subexp_java
1155};
1156
1157const struct language_defn java_language_defn =
1158{
1159  "java",			/* Language name */
1160  language_java,
1161  range_check_off,
1162  type_check_off,
1163  case_sensitive_on,
1164  array_row_major,
1165  macro_expansion_no,
1166  &exp_descriptor_java,
1167  java_parse,
1168  java_error,
1169  null_post_parser,
1170  c_printchar,			/* Print a character constant */
1171  c_printstr,			/* Function to print string constant */
1172  java_emit_char,		/* Function to print a single character */
1173  java_print_type,		/* Print a type using appropriate syntax */
1174  default_print_typedef,	/* Print a typedef using appropriate syntax */
1175  java_val_print,		/* Print a value using appropriate syntax */
1176  java_value_print,		/* Print a top-level value */
1177  NULL,				/* Language specific skip_trampoline */
1178  "this",	                /* name_of_this */
1179  basic_lookup_symbol_nonlocal,	/* lookup_symbol_nonlocal */
1180  basic_lookup_transparent_type,/* lookup_transparent_type */
1181  java_demangle,		/* Language specific symbol demangler */
1182  java_class_name_from_physname,/* Language specific class name */
1183  java_op_print_tab,		/* expression operators for printing */
1184  0,				/* not c-style arrays */
1185  0,				/* String lower bound */
1186  default_word_break_characters,
1187  default_make_symbol_completion_list,
1188  java_language_arch_info,
1189  default_print_array_index,
1190  default_pass_by_reference,
1191  default_get_string,
1192  LANG_MAGIC
1193};
1194
1195static void *
1196build_java_types (struct gdbarch *gdbarch)
1197{
1198  struct builtin_java_type *builtin_java_type
1199    = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_java_type);
1200
1201  builtin_java_type->builtin_int
1202    = arch_integer_type (gdbarch, 32, 0, "int");
1203  builtin_java_type->builtin_short
1204    = arch_integer_type (gdbarch, 16, 0, "short");
1205  builtin_java_type->builtin_long
1206    = arch_integer_type (gdbarch, 64, 0, "long");
1207  builtin_java_type->builtin_byte
1208    = arch_integer_type (gdbarch, 8, 0, "byte");
1209  builtin_java_type->builtin_boolean
1210    = arch_boolean_type (gdbarch, 8, 0, "boolean");
1211  builtin_java_type->builtin_char
1212    = arch_character_type (gdbarch, 16, 1, "char");
1213  builtin_java_type->builtin_float
1214    = arch_float_type (gdbarch, 32, "float", NULL);
1215  builtin_java_type->builtin_double
1216    = arch_float_type (gdbarch, 64, "double", NULL);
1217  builtin_java_type->builtin_void
1218    = arch_type (gdbarch, TYPE_CODE_VOID, 1, "void");
1219
1220  return builtin_java_type;
1221}
1222
1223static struct gdbarch_data *java_type_data;
1224
1225const struct builtin_java_type *
1226builtin_java_type (struct gdbarch *gdbarch)
1227{
1228  return gdbarch_data (gdbarch, java_type_data);
1229}
1230
1231void
1232_initialize_java_language (void)
1233{
1234  jv_dynamics_objfile_data_key
1235    = register_objfile_data_with_cleanup (NULL, jv_per_objfile_free);
1236  jv_type_objfile_data_key
1237    = register_objfile_data_with_cleanup (NULL, jv_clear_object_type);
1238
1239  java_type_data = gdbarch_data_register_post_init (build_java_types);
1240
1241  add_language (&java_language_defn);
1242}
1243