/* Handle initialization things in C++.
- Copyright (C) 1987, 89, 92-98, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1987, 89, 92-98, 1999, 2000 Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com)
This file is part of GNU CC.
#include "toplev.h"
#include "ggc.h"
-static void expand_aggr_vbase_init_1 PROTO((tree, tree, tree, tree));
-static void construct_virtual_bases PROTO((tree, tree, tree, tree, tree));
-static void expand_aggr_init_1 PROTO((tree, tree, tree, tree, int));
-static void expand_default_init PROTO((tree, tree, tree, tree, int));
-static tree build_vec_delete_1 PROTO((tree, tree, tree, tree, int));
-static void perform_member_init PROTO((tree, tree, tree, int));
-static void sort_base_init PROTO((tree, tree *, tree *));
-static tree build_builtin_delete_call PROTO((tree));
-static int member_init_ok_or_else PROTO((tree, tree, const char *));
-static void expand_virtual_init PROTO((tree, tree));
-static tree sort_member_init PROTO((tree));
-static tree initializing_context PROTO((tree));
-static tree build_java_class_ref PROTO((tree));
-static void expand_cleanup_for_base PROTO((tree, tree));
-static tree get_temp_regvar PROTO((tree, tree));
+static void expand_aggr_vbase_init_1 PARAMS ((tree, tree, tree, tree));
+static void construct_virtual_bases PARAMS ((tree, tree, tree, tree, tree));
+static void expand_aggr_init_1 PARAMS ((tree, tree, tree, tree, int));
+static void expand_default_init PARAMS ((tree, tree, tree, tree, int));
+static tree build_vec_delete_1 PARAMS ((tree, tree, tree, tree, int));
+static void perform_member_init PARAMS ((tree, tree, tree, int));
+static void sort_base_init PARAMS ((tree, tree *, tree *));
+static tree build_builtin_delete_call PARAMS ((tree));
+static int member_init_ok_or_else PARAMS ((tree, tree, const char *));
+static void expand_virtual_init PARAMS ((tree, tree));
+static tree sort_member_init PARAMS ((tree));
+static tree initializing_context PARAMS ((tree));
+static tree build_java_class_ref PARAMS ((tree));
+static void expand_cleanup_for_base PARAMS ((tree, tree));
+static tree get_temp_regvar PARAMS ((tree, tree));
+static tree dfs_initialize_vtbl_ptrs PARAMS ((tree, void *));
/* Set up local variable for this file. MUST BE CALLED AFTER
INIT_DECL_PROCESSING. */
/* Define the structure that holds header information for
arrays allocated via operator new. */
- BI_header_type = make_lang_type (RECORD_TYPE);
+ BI_header_type = make_aggr_type (RECORD_TYPE);
nelts_identifier = get_identifier ("nelts");
fields[0] = build_lang_decl (FIELD_DECL, nelts_identifier, sizetype);
ggc_add_tree_root (&BI_header_size, 1);
}
-/* Subroutine of emit_base_init. For BINFO, initialize all the
- virtual function table pointers, except those that come from
- virtual base classes. Initialize binfo's vtable pointer, if
- INIT_SELF is true. CAN_ELIDE is true when we know that all virtual
- function table pointers in all bases have been initialized already,
- probably because their constructors have just be run. ADDR is the
- pointer to the object whos vtables we are going to initialize.
+/* Called from initialize_vtbl_ptrs via dfs_walk. */
- REAL_BINFO is usually the same as BINFO, except when addr is not of
- pointer to the type of the real derived type that we want to
- initialize for. This is the case when addr is a pointer to a sub
- object of a complete object, and we only want to do part of the
- complete object's initialization of vtable pointers. This is done
- for all virtual table pointers in virtual base classes. REAL_BINFO
- is used to find the BINFO_VTABLE that we initialize with. BINFO is
- used for conversions of addr to subobjects.
+static tree
+dfs_initialize_vtbl_ptrs (binfo, data)
+ tree binfo;
+ void *data;
+{
+ if (!BINFO_PRIMARY_MARKED_P (binfo)
+ && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo)))
+ {
+ tree base_ptr = TREE_VALUE ((tree) data);
+
+ if (TREE_VIA_VIRTUAL (binfo))
+ base_ptr = convert_pointer_to_vbase (BINFO_TYPE (binfo),
+ base_ptr);
+ else
+ base_ptr
+ = build_vbase_path (PLUS_EXPR,
+ build_pointer_type (BINFO_TYPE (binfo)),
+ base_ptr,
+ binfo,
+ /*nonnull=*/1);
- BINFO_TYPE (real_binfo) must be BINFO_TYPE (binfo).
+ expand_virtual_init (binfo, base_ptr);
+ }
+
+ SET_BINFO_MARKED (binfo);
+
+ return NULL_TREE;
+}
- Relies upon binfo being inside TYPE_BINFO (TREE_TYPE (TREE_TYPE
- (addr))). */
+/* Initialize all the vtable pointers for the hierarchy dominated by
+ TYPE. */
void
-expand_direct_vtbls_init (real_binfo, binfo, init_self, can_elide, addr)
- tree real_binfo, binfo, addr;
- int init_self, can_elide;
+initialize_vtbl_ptrs (type, addr)
+ tree type;
+ tree addr;
{
- tree real_binfos = BINFO_BASETYPES (real_binfo);
- tree binfos = BINFO_BASETYPES (binfo);
- int i, n_baselinks = real_binfos ? TREE_VEC_LENGTH (real_binfos) : 0;
-
- for (i = 0; i < n_baselinks; i++)
- {
- tree real_base_binfo = TREE_VEC_ELT (real_binfos, i);
- tree base_binfo = TREE_VEC_ELT (binfos, i);
- int is_not_base_vtable
- = i != CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (real_binfo));
- if (! TREE_VIA_VIRTUAL (real_base_binfo))
- expand_direct_vtbls_init (real_base_binfo, base_binfo,
- is_not_base_vtable, can_elide, addr);
- }
-#if 0
- /* Before turning this on, make sure it is correct. */
- if (can_elide && ! BINFO_MODIFIED (binfo))
- return;
-#endif
- /* Should we use something besides CLASSTYPE_VFIELDS? */
- if (init_self && CLASSTYPE_VFIELDS (BINFO_TYPE (real_binfo)))
- {
- tree base_ptr = convert_pointer_to_real (binfo, addr);
- expand_virtual_init (real_binfo, base_ptr);
- }
+ tree list = build_tree_list (type, addr);
+
+ /* Walk through the hierarchy, initializing the vptr in each base
+ class. We do these in pre-order because under the new ABI we
+ can't find the virtual bases for a class until we've initialized
+ the vtbl for that class. */
+ dfs_walk_real (TYPE_BINFO (type), dfs_initialize_vtbl_ptrs,
+ NULL, dfs_unmarked_real_bases_queue_p, list);
+ dfs_walk (TYPE_BINFO (type), dfs_unmark,
+ dfs_marked_real_bases_queue_p, type);
+ if (TYPE_USES_VIRTUAL_BASECLASSES (type))
+ expand_indirect_vtbls_init (TYPE_BINFO (type), addr);
}
+
\f
/* 348 - 351 */
/* Subroutine of emit_base_init. */
/* Since `init' is already a TREE_LIST on the current_member_init_list,
only build it into one if we aren't already a list. */
if (init != NULL_TREE && TREE_CODE (init) != TREE_LIST)
- init = build_expr_list (NULL_TREE, init);
+ init = build_tree_list (NULL_TREE, init);
if (explicit
&& TREE_CODE (type) == ARRAY_TYPE
this constructor is the top-level constructor called. */
if (TREE_VIA_VIRTUAL (binfo))
{
- tree v = CLASSTYPE_VBASECLASSES (t);
- while (BINFO_TYPE (v) != BINFO_TYPE (binfo))
- v = TREE_CHAIN (v);
-
+ tree v = BINFO_FOR_VBASE (BINFO_TYPE (binfo), t);
vbases = tree_cons (v, TREE_VALUE (x), vbases);
continue;
}
rbase_init_list = TREE_CHAIN (rbase_init_list);
}
- /* Initialize all the virtual function table fields that
- do come from virtual base classes. */
- if (TYPE_USES_VIRTUAL_BASECLASSES (t))
- expand_indirect_vtbls_init (t_binfo, current_class_ref, current_class_ptr);
-
- /* Initialize all the virtual function table fields that
- do not come from virtual base classes. */
- expand_direct_vtbls_init (t_binfo, t_binfo, 1, 1, current_class_ptr);
+ /* Initialize the vtable pointers for the class. */
+ initialize_vtbl_ptrs (t, current_class_ptr);
for (member = TYPE_FIELDS (t); member; member = TREE_CHAIN (member))
{
tree vtbl, vtbl_ptr;
tree vtype, vtype_binfo;
- /* This code is crusty. Should be simple, like:
- vtbl = BINFO_VTABLE (binfo);
- */
+ /* Compute the location of the vtable. */
vtype = DECL_CONTEXT (TYPE_VFIELD (type));
vtype_binfo = get_binfo (vtype, TREE_TYPE (TREE_TYPE (decl)), 0);
vtbl = BINFO_VTABLE (binfo_value (DECL_FIELD_CONTEXT (TYPE_VFIELD (type)), binfo));
- assemble_external (vtbl);
- TREE_USED (vtbl) = 1;
- vtbl = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (vtbl)), vtbl);
+
+ if (TREE_CODE (vtbl) == VAR_DECL)
+ {
+ assemble_external (vtbl);
+ TREE_USED (vtbl) = 1;
+ vtbl = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (vtbl)), vtbl);
+ }
+ else
+ /* Under the new ABI, secondary vtables are stored with the
+ primary vtable. So, the BINFO_VTABLE may be an expression for
+ computing the secondary vtable, rather than the secondary
+ vtable itself. */
+ my_friendly_assert (merge_primary_and_secondary_vtables_p (),
+ 20000220);
+
+ /* Under the new ABI, we need to point into the middle of the
+ vtable. */
+ if (vbase_offsets_in_vtable_p ())
+ vtbl = build (PLUS_EXPR, TREE_TYPE (vtbl), vtbl,
+ size_extra_vtbl_entries (binfo));
+
+ /* Compute the location of the vtpr. */
decl = convert_pointer_to_real (vtype_binfo, decl);
vtbl_ptr = build_vfield_ref (build_indirect_ref (decl, NULL_PTR), vtype);
if (vtbl_ptr == error_mark_node)
return;
- /* Have to convert VTBL since array sizes may be different. */
+ /* Assign the vtable to the vptr. */
vtbl = convert_force (TREE_TYPE (vtbl_ptr), vtbl, 0);
finish_expr_stmt (build_modify_expr (vtbl_ptr, NOP_EXPR, vtbl));
}
/* Call the destructor. */
expr = (build_scoped_method_call
(current_class_ref, binfo, dtor_identifier,
- build_expr_list (NULL_TREE, integer_zero_node)));
+ build_tree_list (NULL_TREE, integer_zero_node)));
if (flag)
expr = fold (build (COND_EXPR, void_type_node,
truthvalue_conversion (flag),
/* Construct the virtual base-classes of THIS_REF (whose address is
THIS_PTR). The object has the indicated TYPE. The construction
actually takes place only if FLAG is non-zero. INIT_LIST is list
- of initialization for constructor to perform. */
+ of initializations for constructors to perform. */
static void
construct_virtual_bases (type, this_ref, this_ptr, init_list, flag)
tree flag;
{
tree vbases;
- tree result;
- tree if_stmt;
/* If there are no virtual baseclasses, we shouldn't even be here. */
my_friendly_assert (TYPE_USES_VIRTUAL_BASECLASSES (type), 19990621);
/* First set the pointers in our object that tell us where to find
our virtual baseclasses. */
- if_stmt = begin_if_stmt ();
- finish_if_stmt_cond (flag, if_stmt);
- result = init_vbase_pointers (type, this_ptr);
- if (result)
- finish_expr_stmt (build_compound_expr (result));
- finish_then_clause (if_stmt);
- finish_if_stmt ();
+ if (!vbase_offsets_in_vtable_p ())
+ {
+ tree if_stmt;
+ tree result;
+
+ if_stmt = begin_if_stmt ();
+ finish_if_stmt_cond (flag, if_stmt);
+ result = init_vbase_pointers (type, this_ptr);
+ if (result)
+ finish_expr_stmt (build_compound_expr (result));
+ finish_then_clause (if_stmt);
+ finish_if_stmt ();
+ }
/* Now, run through the baseclasses, initializing each. */
for (vbases = CLASSTYPE_VBASECLASSES (type); vbases;
vbases = TREE_CHAIN (vbases))
{
- tree tmp = purpose_member (vbases, result);
tree inner_if_stmt;
tree compound_stmt;
+ tree exp;
/* If there are virtual base classes with destructors, we need to
emit cleanups to destroy them if an exception is thrown during
inner_if_stmt = begin_if_stmt ();
finish_if_stmt_cond (flag, inner_if_stmt);
compound_stmt = begin_compound_stmt (/*has_no_scope=*/1);
- expand_aggr_vbase_init_1 (vbases, this_ref,
- TREE_OPERAND (TREE_VALUE (tmp), 0),
- init_list);
+
+ /* Compute the location of the virtual base. If we're
+ constructing virtual bases, then we must be the most derived
+ class. Therefore, we don't have to look up the virtual base;
+ we already know where it is. */
+ exp = build (PLUS_EXPR,
+ TREE_TYPE (this_ptr),
+ this_ptr,
+ BINFO_OFFSET (vbases));
+ exp = build1 (NOP_EXPR,
+ build_pointer_type (BINFO_TYPE (vbases)),
+ exp);
+
+ expand_aggr_vbase_init_1 (vbases, this_ref, exp, init_list);
finish_compound_stmt (/*has_no_scope=*/1, compound_stmt);
finish_then_clause (inner_if_stmt);
finish_if_stmt ();
&& ! current_template_parms
&& ! vec_binfo_member (basetype,
TYPE_BINFO_BASETYPES (type))
- && ! binfo_member (basetype, CLASSTYPE_VBASECLASSES (type)))
+ && ! BINFO_FOR_VBASE (basetype, type))
{
if (IDENTIFIER_CLASS_VALUE (name))
goto try_member;
If `init' is a CONSTRUCTOR, then we emit a warning message,
explaining that such initializations are invalid.
- ALIAS_THIS is nonzero iff we are initializing something which is
- essentially an alias for current_class_ref. In this case, the base
- constructor may move it on us, and we must keep track of such
- deviations.
-
If INIT resolves to a CALL_EXPR which happens to return
something of the type we are looking for, then we know
that we can safely use that call to perform the
init = TREE_VALUE (parms);
}
else
- parms = build_expr_list (NULL_TREE, init);
+ parms = build_tree_list (NULL_TREE, init);
if (TYPE_USES_VIRTUAL_BASECLASSES (type))
{
from TRUE_EXP. In constructors, we don't know anything about
the value being initialized.
- ALIAS_THIS serves the same purpose it serves for expand_aggr_init.
-
FLAGS is just passes to `build_method_call'. See that function for
its description. */
else
return NULL_TREE;
}
-
+
\f
/* This code could just as well go in `class.c', but is placed here for
modularity. */
/* The code in instantiate_type which will process this
expects to encounter OVERLOADs, not raw functions. */
t = ovl_cons (t, NULL_TREE);
-
+
return build (OFFSET_REF,
unknown_type_node,
decl,
basetype = DECL_CONTEXT (member);
base = current_class_ptr;
-
+
if (get_base_distance (basetype, TREE_TYPE (TREE_TYPE (base)), 0, &basetype_path) < 0)
{
error_not_base_type (basetype, TREE_TYPE (TREE_TYPE (base)));
basetype = TYPE_OFFSET_BASETYPE (TREE_TYPE (TREE_TYPE (member)));
addr = convert_pointer_to (basetype, addr);
member = cp_convert (ptrdiff_type_node, member);
-
+
/* Pointer to data members are offset by one, so that a null
pointer with a real value of 0 is distinguishable from an
offset of the first member of a structure. */
{
mark_used (global_delete_fndecl);
return build_call (global_delete_fndecl,
- void_type_node, build_expr_list (NULL_TREE, addr));
+ void_type_node, build_tree_list (NULL_TREE, addr));
}
\f
/* Generate a C++ "new" expression. DECL is either a TREE_LIST
rval = cp_convert (build_pointer_type (true_type), rval);
rval = build_compound_expr
(tree_cons (NULL_TREE, exp1,
- build_expr_list (NULL_TREE, rval)));
+ build_tree_list (NULL_TREE, rval)));
}
if (rval == error_mark_node)
tree compound_stmt;
int destroy_temps;
tree try_block = NULL_TREE;
- tree try_body;
+ tree try_body = NULL_TREE;
int num_initialized_elts = 0;
maxindex = cp_convert (ptrdiff_type_node, maxindex);
passed_auto_delete = auto_delete;
expr = build_method_call
- (ref, dtor_identifier, build_expr_list (NULL_TREE, passed_auto_delete),
+ (ref, dtor_identifier, build_tree_list (NULL_TREE, passed_auto_delete),
NULL_TREE, flags);
if (do_delete)
cond = NULL_TREE;
if (cond)
- exprstmt = build_expr_list (NULL_TREE, cond);
+ exprstmt = build_tree_list (NULL_TREE, cond);
if (base_binfo
&& ! TREE_VIA_VIRTUAL (base_binfo)
expr = build_scoped_method_call
(ref, base_binfo, dtor_identifier,
- build_expr_list (NULL_TREE, this_auto_delete));
+ build_tree_list (NULL_TREE, this_auto_delete));
exprstmt = tree_cons (NULL_TREE, expr, exprstmt);
}
expr = build_scoped_method_call
(ref, base_binfo, dtor_identifier,
- build_expr_list (NULL_TREE, integer_zero_node));
+ build_tree_list (NULL_TREE, integer_zero_node));
exprstmt = tree_cons (NULL_TREE, expr, exprstmt);
}
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