140 lines
4.5 KiB
C
140 lines
4.5 KiB
C
/* Infrastructure for tracking user variable locations and values
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throughout compilation.
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Copyright (C) 2010-2023 Free Software Foundation, Inc.
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Contributed by Alexandre Oliva <aoliva@redhat.com>.
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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_VALTRACK_H
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#define GCC_VALTRACK_H
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/* Debug uses of dead regs. */
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/* Entry that maps a dead pseudo (REG) used in a debug insns that dies
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at different blocks to the debug temp (DTEMP) it was replaced
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with. */
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struct dead_debug_global_entry
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{
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rtx reg;
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rtx dtemp;
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};
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/* Descriptor for hash_table to hash by dead_debug_global_entry's REG
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and map to DTEMP. */
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struct dead_debug_hash_descr : free_ptr_hash <dead_debug_global_entry>
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{
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/* Hash on the pseudo number. */
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static inline hashval_t hash (const dead_debug_global_entry *my);
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/* Entries are identical if they refer to the same pseudo. */
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static inline bool equal (const dead_debug_global_entry *my,
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const dead_debug_global_entry *other);
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};
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/* Hash on the pseudo number. */
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inline hashval_t
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dead_debug_hash_descr::hash (const dead_debug_global_entry *my)
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{
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return REGNO (my->reg);
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}
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/* Entries are identical if they refer to the same pseudo. */
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inline bool
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dead_debug_hash_descr::equal (const dead_debug_global_entry *my,
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const dead_debug_global_entry *other)
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{
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return my->reg == other->reg;
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}
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/* Maintain a global table of pseudos used in debug insns after their
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deaths in other blocks, and debug temps their deathpoint values are
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to be bound to. */
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struct dead_debug_global
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{
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/* This hash table that maps pseudos to debug temps. */
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hash_table<dead_debug_hash_descr> *htab;
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/* For each entry in htab, the bit corresponding to its REGNO will
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be set. */
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bitmap used;
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};
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/* Node of a linked list of uses of dead REGs in debug insns. */
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struct dead_debug_use
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{
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df_ref use;
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struct dead_debug_use *next;
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};
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/* Linked list of the above, with a bitmap of the REGs in the
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list. */
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struct dead_debug_local
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{
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/* The first dead_debug_use entry in the list. */
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struct dead_debug_use *head;
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/* A pointer to the global tracking data structure. */
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struct dead_debug_global *global;
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/* A bitmap that has bits set for each REG used in the
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dead_debug_use list, and for each entry in the global hash
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table. */
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bitmap used;
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/* A bitmap that has bits set for each INSN that is to be
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rescanned. */
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bitmap to_rescan;
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};
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/* This type controls the behavior of dead_debug_insert_temp WRT
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UREGNO and INSN. */
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enum debug_temp_where
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{
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/* Bind a newly-created debug temporary to a REG for UREGNO, and
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insert the debug insn before INSN. REG is expected to die at
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INSN. */
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DEBUG_TEMP_BEFORE_WITH_REG = -1,
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/* Bind a newly-created debug temporary to the value INSN stores
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in REG, and insert the debug insn before INSN. */
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DEBUG_TEMP_BEFORE_WITH_VALUE = 0,
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/* Bind a newly-created debug temporary to a REG for UREGNO, and
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insert the debug insn after INSN. REG is expected to be set at
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INSN. */
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DEBUG_TEMP_AFTER_WITH_REG = 1,
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/* Like DEBUG_TEMP_AFTER_WITH_REG, but force addition of a debug
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temporary even if there is just a single debug use. This is used
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on regs that are becoming REG_DEAD on INSN and so uses of the
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reg later on are invalid. */
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DEBUG_TEMP_AFTER_WITH_REG_FORCE = 2
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};
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extern void dead_debug_global_init (struct dead_debug_global *, bitmap);
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extern void dead_debug_global_finish (struct dead_debug_global *, bitmap);
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extern void dead_debug_local_init (struct dead_debug_local *, bitmap,
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struct dead_debug_global *);
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extern void dead_debug_local_finish (struct dead_debug_local *, bitmap);
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extern void dead_debug_add (struct dead_debug_local *, df_ref, unsigned int);
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extern int dead_debug_insert_temp (struct dead_debug_local *,
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unsigned int uregno, rtx_insn *insn,
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enum debug_temp_where);
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extern void propagate_for_debug (rtx_insn *, rtx_insn *, rtx, rtx, basic_block);
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#endif /* GCC_VALTRACK_H */
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