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class.c (build_vbase_pointer): Relocate.
* class.c (build_vbase_pointer): Relocate. (build_vbase_pointer_fields): Likewise. (dfs_build_vbase_offset_vtbl_entries): Likewise. (build_vbase_offset_vtbl_entries): Likewise. From-SVN: r31442
This commit is contained in:
Mark Mitchell
Mark Mitchell
parent
5bb2a29215
commit
f83611476f
@ -1,5 +1,10 @@
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2000-01-16 Mark Mitchell <mark@codesourcery.com>
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* class.c (build_vbase_pointer): Relocate.
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(build_vbase_pointer_fields): Likewise.
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(dfs_build_vbase_offset_vtbl_entries): Likewise.
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(build_vbase_offset_vtbl_entries): Likewise.
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* decl.c (init_decl_processing): Complain if -fnew-abi
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-fno-vtable-thunks is used.
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410
gcc/cp/class.c
410
gcc/cp/class.c
@ -160,7 +160,191 @@ int n_build_method_call = 0;
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int n_inner_fields_searched = 0;
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#endif
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/* Virtual baseclass things. */
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/* Virtual base class layout. */
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/* Returns a list of virtual base class pointers as a chain of
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FIELD_DECLS. */
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static tree
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build_vbase_pointer_fields (rec, empty_p)
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tree rec;
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int *empty_p;
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{
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/* Chain to hold all the new FIELD_DECLs which point at virtual
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base classes. */
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tree vbase_decls = NULL_TREE;
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tree binfos = TYPE_BINFO_BASETYPES (rec);
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int n_baseclasses = CLASSTYPE_N_BASECLASSES (rec);
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tree decl;
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int i;
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/* Handle basetypes almost like fields, but record their
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offsets differently. */
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for (i = 0; i < n_baseclasses; i++)
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{
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register tree base_binfo = TREE_VEC_ELT (binfos, i);
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register tree basetype = BINFO_TYPE (base_binfo);
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if (TYPE_SIZE (basetype) == 0)
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/* This error is now reported in xref_tag, thus giving better
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location information. */
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continue;
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/* All basetypes are recorded in the association list of the
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derived type. */
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if (TREE_VIA_VIRTUAL (base_binfo))
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{
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int j;
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const char *name;
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/* The offset for a virtual base class is only used in computing
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virtual function tables and for initializing virtual base
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pointers. It is built once `get_vbase_types' is called. */
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/* If this basetype can come from another vbase pointer
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without an additional indirection, we will share
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that pointer. If an indirection is involved, we
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make our own pointer. */
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for (j = 0; j < n_baseclasses; j++)
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{
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tree other_base_binfo = TREE_VEC_ELT (binfos, j);
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if (! TREE_VIA_VIRTUAL (other_base_binfo)
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&& BINFO_FOR_VBASE (basetype, BINFO_TYPE (other_base_binfo)))
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goto got_it;
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}
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FORMAT_VBASE_NAME (name, basetype);
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decl = build_vtbl_or_vbase_field (get_identifier (name),
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get_identifier (VTABLE_BASE),
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build_pointer_type (basetype),
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rec,
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empty_p);
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BINFO_VPTR_FIELD (base_binfo) = decl;
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TREE_CHAIN (decl) = vbase_decls;
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vbase_decls = decl;
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*empty_p = 0;
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got_it:
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/* The space this decl occupies has already been accounted for. */
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;
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}
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}
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return vbase_decls;
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}
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/* Called from build_vbase_offset_vtbl_entries via dfs_walk. */
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static tree
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dfs_build_vbase_offset_vtbl_entries (binfo, data)
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tree binfo;
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void *data;
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{
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tree list = (tree) data;
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if (TREE_TYPE (list) == binfo)
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/* The TREE_TYPE of LIST is the base class from which we started
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walking. If that BINFO is virtual it's not a virtual baseclass
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of itself. */
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;
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else if (TREE_VIA_VIRTUAL (binfo))
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{
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tree init;
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init = BINFO_OFFSET (binfo);
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init = build1 (NOP_EXPR, vtable_entry_type, init);
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TREE_VALUE (list) = tree_cons (NULL_TREE, init, TREE_VALUE (list));
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}
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SET_BINFO_VTABLE_PATH_MARKED (binfo);
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return NULL_TREE;
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}
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/* Returns the initializers for the vbase offset entries in the
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vtable, in reverse order. */
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static tree
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build_vbase_offset_vtbl_entries (binfo)
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tree binfo;
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{
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tree type;
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tree inits;
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tree init;
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/* Under the old ABI, pointers to virtual bases are stored in each
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object. */
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if (!flag_new_abi)
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return NULL_TREE;
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/* If there are no virtual baseclasses, then there is nothing to
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do. */
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type = BINFO_TYPE (binfo);
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if (!TYPE_USES_VIRTUAL_BASECLASSES (type))
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return NULL_TREE;
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inits = NULL_TREE;
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/* Under the new ABI, the vtable contains offsets to all virtual
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bases. The ABI specifies different layouts depending on whether
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or not *all* of the bases of this type are virtual. */
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if (CLASSTYPE_N_BASECLASSES (type)
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== list_length (CLASSTYPE_VBASECLASSES (type)))
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{
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/* In this case, the offsets are allocated from right to left of
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the declaration order in which the virtual bases appear. */
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int i;
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for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i)
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{
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tree vbase = BINFO_BASETYPE (binfo, i);
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init = BINFO_OFFSET (vbase);
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init = build1 (NOP_EXPR, vtable_entry_type, init);
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inits = tree_cons (NULL_TREE, init, inits);
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}
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}
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else
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{
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tree list;
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/* While in this case, the offsets are allocated in the reverse
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order of a depth-first left-to-right traversal of the
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hierarchy. We use BINFO_VTABLE_PATH_MARKED because we are
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ourselves during a dfs_walk, and so BINFO_MARKED is already
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in use. */
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list = build_tree_list (type, NULL_TREE);
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TREE_TYPE (list) = binfo;
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dfs_walk (binfo,
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dfs_build_vbase_offset_vtbl_entries,
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dfs_vtable_path_unmarked_real_bases_queue_p,
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list);
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dfs_walk (binfo,
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dfs_vtable_path_unmark,
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dfs_vtable_path_marked_real_bases_queue_p,
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list);
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inits = nreverse (TREE_VALUE (list));
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}
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/* We've now got offsets in the right oder. However, the offsets
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we've stored are offsets from the beginning of the complete
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object, and we need offsets from this BINFO. */
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for (init = inits; init; init = TREE_CHAIN (init))
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{
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tree exp = TREE_VALUE (init);
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exp = ssize_binop (MINUS_EXPR, exp, BINFO_OFFSET (binfo));
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exp = build1 (NOP_EXPR, vtable_entry_type, TREE_VALUE (init));
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exp = fold (exp);
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TREE_CONSTANT (exp) = 1;
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TREE_VALUE (init) = exp;
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}
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return inits;
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}
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/* Returns a pointer to the virtual base class of EXP that has the
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indicated TYPE. */
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static tree
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build_vbase_pointer (exp, type)
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@ -172,54 +356,6 @@ build_vbase_pointer (exp, type)
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return build_component_ref (exp, get_identifier (name), NULL_TREE, 0);
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}
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#if 0
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/* Is the type of the EXPR, the complete type of the object?
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If we are going to be wrong, we must be conservative, and return 0. */
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static int
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complete_type_p (expr)
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tree expr;
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{
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tree type = TYPE_MAIN_VARIANT (TREE_TYPE (expr));
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while (1)
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{
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switch (TREE_CODE (expr))
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{
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case SAVE_EXPR:
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case INDIRECT_REF:
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case ADDR_EXPR:
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case NOP_EXPR:
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case CONVERT_EXPR:
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expr = TREE_OPERAND (expr, 0);
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continue;
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case CALL_EXPR:
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if (! TREE_HAS_CONSTRUCTOR (expr))
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break;
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/* fall through... */
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case VAR_DECL:
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case FIELD_DECL:
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if (TREE_CODE (TREE_TYPE (expr)) == ARRAY_TYPE
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&& IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (expr)))
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&& TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type)
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return 1;
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/* fall through... */
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case TARGET_EXPR:
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case PARM_DECL:
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if (IS_AGGR_TYPE (TREE_TYPE (expr))
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&& TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type)
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return 1;
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/* fall through... */
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case PLUS_EXPR:
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default:
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break;
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}
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break;
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}
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return 0;
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}
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#endif
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/* Build multi-level access to EXPR using hierarchy path PATH.
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CODE is PLUS_EXPR if we are going with the grain,
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and MINUS_EXPR if we are not (in which case, we cannot traverse
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@ -377,6 +513,7 @@ build_vbase_path (code, type, expr, path, nonnull)
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return build1 (NOP_EXPR, type, expr);
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}
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/* Virtual function things. */
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/* Build an entry in the virtual function table.
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@ -2180,108 +2317,6 @@ size_extra_vtbl_entries (binfo)
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return fold (offset);
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}
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/* Called from build_vbase_offset_vtbl_entries via dfs_walk. */
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static tree
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dfs_build_vbase_offset_vtbl_entries (binfo, data)
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tree binfo;
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void *data;
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{
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tree list = (tree) data;
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if (TREE_TYPE (list) == binfo)
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/* The TREE_TYPE of LIST is the base class from which we started
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walking. If that BINFO is virtual it's not a virtual baseclass
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of itself. */
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;
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else if (TREE_VIA_VIRTUAL (binfo))
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{
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tree init;
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init = BINFO_OFFSET (binfo);
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init = build1 (NOP_EXPR, vtable_entry_type, init);
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TREE_VALUE (list) = tree_cons (NULL_TREE, init, TREE_VALUE (list));
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}
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SET_BINFO_VTABLE_PATH_MARKED (binfo);
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return NULL_TREE;
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}
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/* Returns the initializers for the vbase offset entries in the
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vtable, in reverse order. */
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static tree
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build_vbase_offset_vtbl_entries (binfo)
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tree binfo;
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{
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tree type;
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tree inits;
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tree init;
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type = BINFO_TYPE (binfo);
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if (!TYPE_USES_VIRTUAL_BASECLASSES (type))
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return NULL_TREE;
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inits = NULL_TREE;
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/* Under the new ABI, the vtable contains offsets to all virtual
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bases. The ABI specifies different layouts depending on whether
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or not *all* of the bases of this type are virtual. */
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if (CLASSTYPE_N_BASECLASSES (type)
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== list_length (CLASSTYPE_VBASECLASSES (type)))
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{
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/* In this case, the offsets are allocated from right to left of
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the declaration order in which the virtual bases appear. */
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int i;
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for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i)
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{
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tree vbase = BINFO_BASETYPE (binfo, i);
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init = BINFO_OFFSET (vbase);
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init = build1 (NOP_EXPR, vtable_entry_type, init);
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inits = tree_cons (NULL_TREE, init, inits);
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}
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}
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else
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{
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tree list;
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/* While in this case, the offsets are allocated in the reverse
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order of a depth-first left-to-right traversal of the
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hierarchy. We use BINFO_VTABLE_PATH_MARKED because we are
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ourselves during a dfs_walk, and so BINFO_MARKED is already
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in use. */
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list = build_tree_list (type, NULL_TREE);
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TREE_TYPE (list) = binfo;
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dfs_walk (binfo,
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dfs_build_vbase_offset_vtbl_entries,
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dfs_vtable_path_unmarked_real_bases_queue_p,
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list);
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dfs_walk (binfo,
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dfs_vtable_path_unmark,
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dfs_vtable_path_marked_real_bases_queue_p,
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list);
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inits = nreverse (TREE_VALUE (list));
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}
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/* We've now got offsets in the right oder. However, the offsets
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we've stored are offsets from the beginning of the complete
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object, and we need offsets from this BINFO. */
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for (init = inits; init; init = TREE_CHAIN (init))
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{
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tree exp = TREE_VALUE (init);
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exp = ssize_binop (MINUS_EXPR, exp, BINFO_OFFSET (binfo));
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exp = build1 (NOP_EXPR, vtable_entry_type, TREE_VALUE (init));
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exp = fold (exp);
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TREE_CONSTANT (exp) = 1;
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TREE_VALUE (init) = exp;
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}
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return inits;
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}
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/* Construct the initializer for BINFOs virtual function table. */
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static tree
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@ -2292,7 +2327,7 @@ build_vtbl_initializer (binfo)
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tree inits = NULL_TREE;
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tree type = BINFO_TYPE (binfo);
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if (flag_new_abi)
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/* Add entries to the vtable for offsets to our virtual bases. */
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inits = build_vbase_offset_vtbl_entries (binfo);
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/* Process the RTTI stuff at the head of the list. If we're not
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@ -3799,77 +3834,6 @@ build_vtbl_or_vbase_field (name, assembler_name, type, class_type,
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return field;
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}
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/* Returns list of virtual base class pointers in a FIELD_DECL chain. */
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static tree
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build_vbase_pointer_fields (rec, empty_p)
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tree rec;
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int *empty_p;
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{
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/* Chain to hold all the new FIELD_DECLs which point at virtual
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base classes. */
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tree vbase_decls = NULL_TREE;
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tree binfos = TYPE_BINFO_BASETYPES (rec);
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int n_baseclasses = CLASSTYPE_N_BASECLASSES (rec);
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tree decl;
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int i;
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/* Handle basetypes almost like fields, but record their
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offsets differently. */
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for (i = 0; i < n_baseclasses; i++)
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{
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register tree base_binfo = TREE_VEC_ELT (binfos, i);
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register tree basetype = BINFO_TYPE (base_binfo);
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if (TYPE_SIZE (basetype) == 0)
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/* This error is now reported in xref_tag, thus giving better
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location information. */
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continue;
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/* All basetypes are recorded in the association list of the
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derived type. */
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if (TREE_VIA_VIRTUAL (base_binfo))
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{
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int j;
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const char *name;
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/* The offset for a virtual base class is only used in computing
|
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virtual function tables and for initializing virtual base
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pointers. It is built once `get_vbase_types' is called. */
|
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|
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/* If this basetype can come from another vbase pointer
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without an additional indirection, we will share
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that pointer. If an indirection is involved, we
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make our own pointer. */
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for (j = 0; j < n_baseclasses; j++)
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{
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tree other_base_binfo = TREE_VEC_ELT (binfos, j);
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if (! TREE_VIA_VIRTUAL (other_base_binfo)
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&& BINFO_FOR_VBASE (basetype, BINFO_TYPE (other_base_binfo)))
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goto got_it;
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}
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FORMAT_VBASE_NAME (name, basetype);
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decl = build_vtbl_or_vbase_field (get_identifier (name),
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get_identifier (VTABLE_BASE),
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build_pointer_type (basetype),
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rec,
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empty_p);
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BINFO_VPTR_FIELD (base_binfo) = decl;
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TREE_CHAIN (decl) = vbase_decls;
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vbase_decls = decl;
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*empty_p = 0;
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got_it:
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/* The space this decl occupies has already been accounted for. */
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;
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}
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}
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return vbase_decls;
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}
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/* If the empty base field in DECL overlaps with a base of the same type in
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NEWDECL, which is either another base field or the first data field of
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the class, pad the base just before NEWDECL and return 1. Otherwise,
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