1 files changed, 321 insertions, 0 deletions
diff --git a/gdb/hpacc-abi.c b/gdb/hpacc-abi.c
new file mode 100644
index 0000000..f9ec3174
--- /dev/null
+++ b/gdb/hpacc-abi.c
@@ -0,0 +1,321 @@
+/* Abstraction of HP aCC ABI.
+   Contributed by Daniel Berlin <dberlin@redhat.com>
+   Most of the real code is from HP, i've just fiddled it to fit in
+   the C++ ABI abstraction framework.
+
+   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 "value.h"
+#include "gdb_regex.h"
+#include "gdb_string.h"
+#include "gdbtypes.h"
+#include "gdbcore.h"
+#include "cp-abi.h"
+
+struct cp_abi_ops hpacc_abi_ops;
+
+/* It appears the is_*_name stuff is never used when we try the hpACC
+ * ABI. As such, I have no clue what the real answers are. Shouldn't
+ * have any more effect than it does now.  */
+static regex_t constructor_pattern;
+static regex_t destructor_pattern;
+static regex_t operator_pattern;
+
+static enum dtor_kinds
+hpacc_is_destructor_name (const char *name)
+{
+  if (regexec (&destructor_pattern, name, 0, 0, 0) == 0)
+    return complete_object_dtor;
+  else
+    return 0;
+}
+
+static enum ctor_kinds
+hpacc_is_constructor_name (const char *name)
+{
+  if (regexec (&constructor_pattern, name, 0, 0, 0) == 0)
+    return complete_object_ctor;
+  else
+    return 0;
+}
+
+static int
+hpacc_is_operator_name (const char *name)
+{
+  return regexec (&operator_pattern, name, 0, 0, 0) == 0;
+}
+
+static int
+hpacc_is_vtable_name (const char *name)
+{
+  return strcmp (name,
+		 "This will never match anything, please fill it in") == 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
+hpacc_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));
+
+  /* Deal with HP/Taligent runtime model for virtual functions */
+  value_ptr vp;
+  value_ptr argp;		/* arg1 cast to base */
+  CORE_ADDR coreptr;		/* pointer to target address */
+  int class_index;		/* which class segment pointer to use */
+  struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);	/* method type */
+
+  argp = value_cast (type, *arg1p);
+
+  if (VALUE_ADDRESS (argp) == 0)
+    error ("Address of object is null; object may not have been created.");
+
+  /* pai: FIXME -- 32x64 possible problem? */
+  /* First word (4 bytes) in object layout is the vtable pointer */
+  coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (argp));	/* pai: (temp)  */
+  /* + offset + VALUE_EMBEDDED_OFFSET (argp)); */
+
+  if (!coreptr)
+    error
+      ("Virtual table pointer is null for object; object may not have been created.");
+
+  /* pai/1997-05-09
+   * FIXME: The code here currently handles only
+   * the non-RRBC case of the Taligent/HP runtime spec; when RRBC
+   * is introduced, the condition for the "if" below will have to
+   * be changed to be a test for the RRBC case.  */
+
+  if (1)
+    {
+      /* Non-RRBC case; the virtual function pointers are stored at fixed
+       * offsets in the virtual table. */
+
+      /* Retrieve the offset in the virtual table from the debug
+       * info.  The offset of the vfunc's entry is in words from
+       * the beginning of the vtable; but first we have to adjust
+       * by HP_ACC_VFUNC_START to account for other entries */
+
+      /* pai: FIXME: 32x64 problem here, a word may be 8 bytes in
+       * which case the multiplier should be 8 and values should be long */
+      vp = value_at (builtin_type_int,
+		     coreptr + 4 * (TYPE_FN_FIELD_VOFFSET (f, j) +
+				    HP_ACC_VFUNC_START), NULL);
+
+      coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
+      /* coreptr now contains the address of the virtual function */
+      /* (Actually, it contains the pointer to the plabel for the function. */
+    }
+  else
+    {
+      /* RRBC case; the virtual function pointers are found by double
+       * indirection through the class segment tables. */
+
+      /* Choose class segment depending on type we were passed */
+      class_index = class_index_in_primary_list (type);
+
+      /* Find class segment pointer.  These are in the vtable slots after
+       * some other entries, so adjust by HP_ACC_VFUNC_START for that. */
+      /* pai: FIXME 32x64 problem here, if words are 8 bytes long
+       * the multiplier below has to be 8 and value should be long. */
+      vp = value_at (builtin_type_int,
+		     coreptr + 4 * (HP_ACC_VFUNC_START + class_index), NULL);
+      /* Indirect once more, offset by function index */
+      /* pai: FIXME 32x64 problem here, again multiplier could be 8 and value long */
+      coreptr =
+	*(CORE_ADDR *) (VALUE_CONTENTS (vp) +
+			4 * TYPE_FN_FIELD_VOFFSET (f, j));
+      vp = value_at (builtin_type_int, coreptr, NULL);
+      coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
+
+      /* coreptr now contains the address of the virtual function */
+      /* (Actually, it contains the pointer to the plabel for the function.) */
+
+    }
+
+  if (!coreptr)
+    error ("Address of virtual function is null; error in virtual table?");
+
+  /* Wrap this addr in a value and return pointer */
+  vp = allocate_value (ftype);
+  VALUE_TYPE (vp) = ftype;
+  VALUE_ADDRESS (vp) = coreptr;
+
+  /* pai: (temp) do we need the value_ind stuff in value_fn_field? */
+  return vp;
+}
+
+
+static struct type *
+hpacc_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];
+
+  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;
+
+  /* If neither the declared type nor the enclosing type of the
+   * value structure has a HP ANSI C++ style virtual table,
+   * we can't do anything. */
+  if (!TYPE_HAS_VTABLE (known_type))
+    {
+      known_type = VALUE_ENCLOSING_TYPE (v);
+      CHECK_TYPEDEF (known_type);
+      if ((TYPE_CODE (known_type) != TYPE_CODE_CLASS) ||
+          !TYPE_HAS_VTABLE (known_type))
+        return NULL;		/* No RTTI, or not HP-compiled types */
+      CHECK_TYPEDEF (known_type);
+      using_enclosing = 1;
+    }
+
+  if (using_enclosing && using_enc)
+    *using_enc = 1;
+
+  /* First get the virtual table address */
+  coreptr = *(CORE_ADDR *) ((VALUE_CONTENTS_ALL (v))
+                            + VALUE_OFFSET (v)
+                            + (using_enclosing
+                               ? 0
+                               : VALUE_EMBEDDED_OFFSET (v)));
+  if (coreptr == 0)
+    /* return silently -- maybe called on gdb-generated value */
+    return NULL;
+  
+  /* Fetch the top offset of the object */
+  /* FIXME possible 32x64 problem with pointer size & arithmetic */
+  vp = value_at (builtin_type_int,
+                 coreptr + 4 * HP_ACC_TOP_OFFSET_OFFSET,
+                 VALUE_BFD_SECTION (v));
+  top_offset = value_as_long (vp);
+  if (top)
+    *top = top_offset;
+
+  /* Fetch the typeinfo pointer */
+  /* FIXME possible 32x64 problem with pointer size & arithmetic */
+  vp = value_at (builtin_type_int, coreptr + 4 * HP_ACC_TYPEINFO_OFFSET,
+                 VALUE_BFD_SECTION (v));
+  /* Indirect through the typeinfo pointer and retrieve the pointer
+   * to the string name */
+  coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
+  if (!coreptr)
+    error ("Retrieved null typeinfo pointer in trying to determine "
+           "run-time type");
+  /* 4 -> offset of name field */
+  vp = value_at (builtin_type_int, coreptr + 4, VALUE_BFD_SECTION (v));
+  /* FIXME possible 32x64 problem */
+
+  coreptr = *(CORE_ADDR *) (VALUE_CONTENTS (vp));
+
+  read_memory_string (coreptr, rtti_type_name, 256);
+
+  if (strlen (rtti_type_name) == 0)
+    error ("Retrieved null type name from typeinfo");
+
+  /* search for type */
+  rtti_type = lookup_typename (rtti_type_name, (struct block *) 0, 1);
+
+  if (!rtti_type)
+    error ("Could not find run-time type: invalid type name %s in typeinfo??",
+           rtti_type_name);
+  CHECK_TYPEDEF (rtti_type);
+#if 0
+  printf ("RTTI type name %s, tag %s, full? %d\n", TYPE_NAME (rtti_type),
+          TYPE_TAG_NAME (rtti_type), full ? *full : -1);
+#endif
+  /* Check whether we have the entire object */
+  if (full			/* Non-null pointer passed */
+      &&
+      /* Either we checked on the whole object in hand and found the
+         top offset to be zero */
+      (((top_offset == 0) &&
+        using_enclosing &&
+        TYPE_LENGTH (known_type) == TYPE_LENGTH (rtti_type))
+       ||
+       /* Or we checked on the embedded object and top offset was the
+          same as the embedded offset */
+       ((top_offset == VALUE_EMBEDDED_OFFSET (v)) &&
+        !using_enclosing &&
+        TYPE_LENGTH (VALUE_ENCLOSING_TYPE (v)) == TYPE_LENGTH (rtti_type))))
+
+    *full = 1;
+
+  return rtti_type;
+}
+
+
+static void
+init_hpacc_ops (void)
+{
+  hpacc_abi_ops.shortname = "hpaCC";
+  hpacc_abi_ops.longname = "HP aCC ABI";
+  hpacc_abi_ops.doc = "HP aCC ABI";
+  hpacc_abi_ops.is_destructor_name = hpacc_is_destructor_name;
+  hpacc_abi_ops.is_constructor_name = hpacc_is_constructor_name;
+  hpacc_abi_ops.is_vtable_name = hpacc_is_vtable_name;
+  hpacc_abi_ops.is_operator_name = hpacc_is_operator_name;
+  hpacc_abi_ops.virtual_fn_field = hpacc_virtual_fn_field;
+  hpacc_abi_ops.rtti_type = hpacc_value_rtti_type;
+}
+
+
+void
+_initialize_hpacc_abi (void)
+{
+  init_hpacc_ops ();
+
+  regcomp (&constructor_pattern,
+	   "^This will never match anything, please fill it in$", REG_NOSUB);
+
+  regcomp (&destructor_pattern,
+	   "^This will never match anything, please fill it in$", REG_NOSUB);
+
+  regcomp (&operator_pattern,
+	   "^This will never match anything, please fill it in$", REG_NOSUB);
+
+  register_cp_abi (hpacc_abi_ops);
+}