(Changes from Daniel Berlin, with revisions by Jim Blandy.)

Abstract out operations specific to particular C++ ABI's, and
invoke them through a function table.  This removes the C++ ABI
dependencies scattered throughout the code, and allows us to
cleanly add support for new C++ ABI's.
* cp-abi.h, cp-abi.h, gnu-v2-abi.c, hpacc-abi.c: New files.
* c-typeprint.c, c-valprint.c, dbxread.c, eval.c, gdbtypes.c,
jv-typeprint.c, linespec.c, symtab.c, typeprint.c, valops.c:
#include "cp-abi.h".  These files all use functions now declared
there.
* symtab.h (OPNAME_PREFIX_P, VTBL_PREFIX_P, DESTRUCTOR_PREFIX_P):
Deleted.  These services are now provided by functions declared in
cp-abi.h.
* value.h (value_rtti_type, value_virtual_fn_field): Same.
* values.c (value_virtual_fn_field): Same, for this definition.
* valops.c (value_rtti_type): Same.
* c-typeprint.c (c_type_print_base): Use the functions from
"cp-abi.h", instead of the old macros, or hard-coded ABI-specific
tests.
* dbxread.c (record_minimal_symbol): Same.
* gdbtypes.c (get_destructor_fn_field, virtual_base_index,
virtual_base_index_skip_primaries): Same.
* jv-typeprint.c (java_type_print_base): Same.
* linespec.c (find_methods, decode_line_1): Same.
* symtab.c (gdb_mangle_name): Same.
* Makefile.in (SFILES): Add the new .c files mentioned above.
(cp_abi_h): New variable.
(COMMON_OBS): Add gnu-v2-abi.o, hpacc-abi.o, and cp-abi.o.
(cp-abi.o, gnu-v2-abi.o, hpacc-abi.o): New targets.
(c-typeprint.o, c-valprint.o, dbxread.o, eval.o, gdbtypes.o,
jv-typeprint.o, symtab.o, linespec.o, typeprint.o, valops.o): Add
dependency on $(cp_abi_h).

1 files changed, 332 insertions, 0 deletions

diff --git a/gdb/gnu-v2-abi.c b/gdb/gnu-v2-abi.c
new file mode 100644
index 00000000000..ad73165345a
--- /dev/null
+++ b/gdb/gnu-v2-abi.c
@@ -0,0 +1,332 @@
+/* Abstraction of GNU v2 abi.
+   Contributed by Daniel Berlin <dberlin@redhat.com>
+   Copyright 2001 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 "gdb_regex.h"
+#include "gdb_string.h"
+#include "symtab.h"
+#include "gdbtypes.h"
+#include "value.h"
+#include "demangle.h"
+#include "cp-abi.h"
+
+#include <ctype.h>
+
+struct cp_abi_ops gnu_v2_abi_ops;
+
+static int vb_match (struct type *, int, struct type *);
+
+static enum dtor_kinds
+gnuv2_is_destructor_name (const char *name)
+{
+  if ((name[0] == '_' && is_cplus_marker (name[1]) && name[2] == '_')
+      || strncmp (name, "__dt__", 6) == 0)
+    return complete_object_dtor;
+  else
+    return 0;
+}
+
+static enum ctor_kinds
+gnuv2_is_constructor_name (const char *name)
+{
+  if ((name[0] == '_' && name[1] == '_'
+       && (isdigit (name[2]) || strchr ("Qt", name[2])))
+      || strncmp (name, "__ct__", 6) == 0)
+    return complete_object_ctor;
+  else
+    return 0;
+}
+
+static int
+gnuv2_is_vtable_name (const char *name)
+{
+  return (((name)[0] == '_'
+	   && (((name)[1] == 'V' && (name)[2] == 'T')
+	       || ((name)[1] == 'v' && (name)[2] == 't'))
+	   && is_cplus_marker ((name)[3])) ||
+	  ((name)[0] == '_' && (name)[1] == '_'
+	   && (name)[2] == 'v' && (name)[3] == 't' && (name)[4] == '_'));
+}
+
+static int
+gnuv2_is_operator_name (const char *name)
+{
+  return strncmp (name, "operator", 8) == 0;
+}
+
+
+/* Return a virtual function as a value.
+   ARG1 is the object which provides the virtual function
+   table pointer.  *ARG1P is side-effected in calling this function.
+   F is the list of member functions which contains the desired virtual
+   function.
+   J is an index into F which provides the desired virtual function.
+
+   TYPE is the type in which F is located.  */
+static value_ptr
+gnuv2_virtual_fn_field (value_ptr * arg1p, struct fn_field * f, int j,
+			struct type * type, int offset)
+{
+  value_ptr arg1 = *arg1p;
+  struct type *type1 = check_typedef (VALUE_TYPE (arg1));
+
+
+  struct type *entry_type;
+  /* First, get the virtual function table pointer.  That comes
+     with a strange type, so cast it to type `pointer to long' (which
+     should serve just fine as a function type).  Then, index into
+     the table, and convert final value to appropriate function type.  */
+  value_ptr entry, vfn, vtbl;
+  value_ptr vi = value_from_longest (builtin_type_int,
+				     (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j));
+  struct type *fcontext = TYPE_FN_FIELD_FCONTEXT (f, j);
+  struct type *context;
+  if (fcontext == NULL)
+    /* We don't have an fcontext (e.g. the program was compiled with
+       g++ version 1).  Try to get the vtbl from the TYPE_VPTR_BASETYPE.
+       This won't work right for multiple inheritance, but at least we
+       should do as well as GDB 3.x did.  */
+    fcontext = TYPE_VPTR_BASETYPE (type);
+  context = lookup_pointer_type (fcontext);
+  /* Now context is a pointer to the basetype containing the vtbl.  */
+  if (TYPE_TARGET_TYPE (context) != type1)
+    {
+      value_ptr tmp = value_cast (context, value_addr (arg1));
+      VALUE_POINTED_TO_OFFSET (tmp) = 0;
+      arg1 = value_ind (tmp);
+      type1 = check_typedef (VALUE_TYPE (arg1));
+    }
+
+  context = type1;
+  /* Now context is the basetype containing the vtbl.  */
+
+  /* This type may have been defined before its virtual function table
+     was.  If so, fill in the virtual function table entry for the
+     type now.  */
+  if (TYPE_VPTR_FIELDNO (context) < 0)
+    fill_in_vptr_fieldno (context);
+
+  /* The virtual function table is now an array of structures
+     which have the form { int16 offset, delta; void *pfn; }.  */
+  vtbl = value_primitive_field (arg1, 0, TYPE_VPTR_FIELDNO (context),
+				TYPE_VPTR_BASETYPE (context));
+
+  /* With older versions of g++, the vtbl field pointed to an array
+     of structures.  Nowadays it points directly to the structure. */
+  if (TYPE_CODE (VALUE_TYPE (vtbl)) == TYPE_CODE_PTR
+      && TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (vtbl))) == TYPE_CODE_ARRAY)
+    {
+      /* Handle the case where the vtbl field points to an
+         array of structures. */
+      vtbl = value_ind (vtbl);
+
+      /* Index into the virtual function table.  This is hard-coded because
+         looking up a field is not cheap, and it may be important to save
+         time, e.g. if the user has set a conditional breakpoint calling
+         a virtual function.  */
+      entry = value_subscript (vtbl, vi);
+    }
+  else
+    {
+      /* Handle the case where the vtbl field points directly to a structure. */
+      vtbl = value_add (vtbl, vi);
+      entry = value_ind (vtbl);
+    }
+
+  entry_type = check_typedef (VALUE_TYPE (entry));
+
+  if (TYPE_CODE (entry_type) == TYPE_CODE_STRUCT)
+    {
+      /* Move the `this' pointer according to the virtual function table. */
+      VALUE_OFFSET (arg1) += value_as_long (value_field (entry, 0));
+
+      if (!VALUE_LAZY (arg1))
+	{
+	  VALUE_LAZY (arg1) = 1;
+	  value_fetch_lazy (arg1);
+	}
+
+      vfn = value_field (entry, 2);
+    }
+  else if (TYPE_CODE (entry_type) == TYPE_CODE_PTR)
+    vfn = entry;
+  else
+    error ("I'm confused:  virtual function table has bad type");
+  /* Reinstantiate the function pointer with the correct type.  */
+  VALUE_TYPE (vfn) = lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j));
+
+  *arg1p = arg1;
+  return vfn;
+}
+
+
+struct type *
+gnuv2_value_rtti_type (value_ptr v, int *full, int *top, int *using_enc)
+{
+  struct type *known_type;
+  struct type *rtti_type;
+  CORE_ADDR coreptr;
+  value_ptr vp;
+  int using_enclosing = 0;
+  long top_offset = 0;
+  char rtti_type_name[256];
+  CORE_ADDR vtbl;
+  struct minimal_symbol *minsym;
+  struct symbol *sym;
+  char *demangled_name;
+  struct type *btype;
+
+  if (full)
+    *full = 0;
+  if (top)
+    *top = -1;
+  if (using_enc)
+    *using_enc = 0;
+
+  /* Get declared type */
+  known_type = VALUE_TYPE (v);
+  CHECK_TYPEDEF (known_type);
+  /* RTTI works only or class objects */
+  if (TYPE_CODE (known_type) != TYPE_CODE_CLASS)
+    return NULL;
+
+  /* Plan on this changing in the future as i get around to setting
+     the vtables properly for G++ compiled stuff.  Also, I'll be using
+     the type info functions, which are always right.  Deal with it
+     until then.  */
+
+  /* If the type has no vptr fieldno, try to get it filled in */
+  if (TYPE_VPTR_FIELDNO(known_type) < 0)
+    fill_in_vptr_fieldno(known_type);
+
+  /* If we still can't find one, give up */
+  if (TYPE_VPTR_FIELDNO(known_type) < 0)
+    return NULL;
+
+  /* Make sure our basetype and known type match, otherwise, cast
+     so we can get at the vtable properly.
+  */
+  btype = TYPE_VPTR_BASETYPE (known_type);
+  CHECK_TYPEDEF (btype);
+  if (btype != known_type )
+    {
+      v = value_cast (btype, v);
+      if (using_enc)
+        *using_enc=1;
+    }
+  /*
+    We can't use value_ind here, because it would want to use RTTI, and
+    we'd waste a bunch of time figuring out we already know the type.
+    Besides, we don't care about the type, just the actual pointer
+  */
+  if (VALUE_ADDRESS (value_field (v, TYPE_VPTR_FIELDNO (known_type))) == 0)
+    return NULL;
+
+  /*
+    If we are enclosed by something that isn't us, adjust the
+    address properly and set using_enclosing.
+  */
+  if (VALUE_ENCLOSING_TYPE(v) != VALUE_TYPE(v))
+    {
+      value_ptr tempval;
+      int bitpos = TYPE_BASECLASS_BITPOS (known_type,
+                                          TYPE_VPTR_FIELDNO (known_type));
+      tempval=value_field (v, TYPE_VPTR_FIELDNO(known_type));
+      VALUE_ADDRESS(tempval) += bitpos / 8;
+      vtbl=value_as_pointer (tempval);
+      using_enclosing=1;
+    }
+  else
+    {
+      vtbl=value_as_pointer(value_field(v,TYPE_VPTR_FIELDNO(known_type)));
+      using_enclosing=0;
+    }
+
+  /* Try to find a symbol that is the vtable */
+  minsym=lookup_minimal_symbol_by_pc(vtbl);
+  if (minsym==NULL
+      || (demangled_name=SYMBOL_NAME(minsym))==NULL
+      || !is_vtable_name (demangled_name))
+    return NULL;
+
+  /* If we just skip the prefix, we get screwed by namespaces */
+  demangled_name=cplus_demangle(demangled_name,DMGL_PARAMS|DMGL_ANSI);
+  *(strchr(demangled_name,' '))=0;
+
+  /* Lookup the type for the name */
+  rtti_type=lookup_typename(demangled_name, (struct block *)0,1);
+
+  if (rtti_type==NULL)
+    return NULL;
+
+  if (TYPE_N_BASECLASSES(rtti_type) > 1 &&  full && (*full) != 1)
+    {
+      if (top)
+        *top=TYPE_BASECLASS_BITPOS(rtti_type,TYPE_VPTR_FIELDNO(rtti_type))/8;
+      if (top && ((*top) >0))
+        {
+          if (TYPE_LENGTH(rtti_type) > TYPE_LENGTH(known_type))
+            {
+              if (full)
+                *full=0;
+            }
+          else
+            {
+              if (full)
+                *full=1;
+            }
+        }
+    }
+  else
+    {
+      if (full)
+        *full=1;
+    }
+  if (using_enc)
+    *using_enc=using_enclosing;
+
+  return rtti_type;
+}
+
+
+static void
+init_gnuv2_ops (void)
+{
+  gnu_v2_abi_ops.shortname = "gnu-v2";
+  gnu_v2_abi_ops.longname = "GNU G++ Version 2 ABI";
+  gnu_v2_abi_ops.doc = "G++ Version 2 ABI";
+  gnu_v2_abi_ops.is_destructor_name = gnuv2_is_destructor_name;
+  gnu_v2_abi_ops.is_constructor_name = gnuv2_is_constructor_name;
+  gnu_v2_abi_ops.is_vtable_name = gnuv2_is_vtable_name;
+  gnu_v2_abi_ops.is_operator_name = gnuv2_is_operator_name;
+  gnu_v2_abi_ops.virtual_fn_field = gnuv2_virtual_fn_field;
+  gnu_v2_abi_ops.rtti_type = gnuv2_value_rtti_type;
+}
+
+void
+_initialize_gnu_v2_abi (void)
+{
+  init_gnuv2_ops ();
+  register_cp_abi (gnu_v2_abi_ops);
+  switch_to_cp_abi ("gnu-v2");
+}