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authorJim Blandy <jimb@codesourcery.com>2001-04-27 00:19:09 +0000
committerJim Blandy <jimb@codesourcery.com>2001-04-27 00:19:09 +0000
commitf0f81458ce15d0fa455ffb80ac5bfb665f88bb8b (patch)
tree9a8c497f061b1321dabc1a8a0fce768f2008b037 /gdb/hpacc-abi.c
parent1eb93c8be3f2118012ee08b80f9160bb8d13b917 (diff)
downloadgdb-f0f81458ce15d0fa455ffb80ac5bfb665f88bb8b.tar.gz
(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).
Diffstat (limited to 'gdb/hpacc-abi.c')
-rw-r--r--gdb/hpacc-abi.c321
1 files changed, 321 insertions, 0 deletions
diff --git a/gdb/hpacc-abi.c b/gdb/hpacc-abi.c
new file mode 100644
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--- /dev/null
+++ b/gdb/hpacc-abi.c
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+/* 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);
+}