140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
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/* IPA reference lists.
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Copyright (C) 2010-2023 Free Software Foundation, Inc.
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Contributed by Jan Hubicka
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_IPA_REF_H
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#define GCC_IPA_REF_H
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struct cgraph_node;
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struct varpool_node;
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struct symtab_node;
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/* How the reference is done. */
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enum ipa_ref_use
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{
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IPA_REF_LOAD,
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IPA_REF_STORE,
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IPA_REF_ADDR,
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IPA_REF_ALIAS
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};
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/* Record of reference in callgraph or varpool. */
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struct ipa_ref
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{
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public:
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/* Remove reference. */
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void remove_reference ();
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/* Return true when execution of reference can lead to return from
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function. */
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bool cannot_lead_to_return ();
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/* Return true if reference may be used in address compare. */
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bool address_matters_p ();
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/* Return reference list this reference is in. */
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struct ipa_ref_list * referring_ref_list (void);
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/* Return reference list this reference is in. */
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struct ipa_ref_list * referred_ref_list (void);
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symtab_node *referring;
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symtab_node *referred;
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gimple *stmt;
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unsigned int lto_stmt_uid;
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unsigned int referred_index;
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/* speculative id is used to link direct calls with their corresponding
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IPA_REF_ADDR references when representing speculative calls. */
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unsigned int speculative_id : 16;
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ENUM_BITFIELD (ipa_ref_use) use:3;
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unsigned int speculative:1;
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};
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typedef struct ipa_ref ipa_ref_t;
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/* List of references. This is stored in both callgraph and varpool nodes. */
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struct ipa_ref_list
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{
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public:
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/* Return first reference in list or NULL if empty. */
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struct ipa_ref *first_reference (void)
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{
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if (!references.length ())
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return NULL;
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return &references[0];
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}
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/* Return first referring ref in list or NULL if empty. */
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struct ipa_ref *first_referring (void)
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{
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if (!referring.length ())
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return NULL;
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return referring[0];
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}
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/* Return first referring alias. */
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struct ipa_ref *first_alias (void)
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{
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struct ipa_ref *r = first_referring ();
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return r && r->use == IPA_REF_ALIAS ? r : NULL;
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}
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/* Return last referring alias. */
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struct ipa_ref *last_alias (void)
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{
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unsigned int i = 0;
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for(i = 0; i < referring.length (); i++)
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if (referring[i]->use != IPA_REF_ALIAS)
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break;
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return i == 0 ? NULL : referring[i - 1];
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}
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/* Return true if the symbol has an alias. */
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bool inline has_aliases_p (void)
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{
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return first_alias ();
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}
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/* Clear reference list. */
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void clear (void)
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{
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referring.create (0);
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references.create (0);
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}
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/* Return number of references. */
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unsigned int nreferences (void)
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{
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return references.length ();
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}
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/* Store actual references in references vector. */
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vec<ipa_ref_t, va_heap, vl_ptr> references;
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/* Referring is vector of pointers to references. It must not live in GGC space
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or GGC will try to mark middle of references vectors. */
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vec<ipa_ref_t *, va_heap, vl_ptr> referring;
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};
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#endif /* GCC_IPA_REF_H */
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