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/* Infrastructure for tracking user variable locations and values
throughout compilation.
Copyright (C) 2010-2024 Free Software Foundation, Inc.
Contributed by Alexandre Oliva <aoliva@redhat.com>.
This file is part of GCC.
GCC 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 3, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_VALTRACK_H
#define GCC_VALTRACK_H
/* Debug uses of dead regs. */
/* Entry that maps a dead pseudo (REG) used in a debug insns that dies
at different blocks to the debug temp (DTEMP) it was replaced
with. */
struct dead_debug_global_entry
{
rtx reg;
rtx dtemp;
};
/* Descriptor for hash_table to hash by dead_debug_global_entry's REG
and map to DTEMP. */
struct dead_debug_hash_descr : free_ptr_hash <dead_debug_global_entry>
{
/* Hash on the pseudo number. */
static inline hashval_t hash (const dead_debug_global_entry *my);
/* Entries are identical if they refer to the same pseudo. */
static inline bool equal (const dead_debug_global_entry *my,
const dead_debug_global_entry *other);
};
/* Hash on the pseudo number. */
inline hashval_t
dead_debug_hash_descr::hash (const dead_debug_global_entry *my)
{
return REGNO (my->reg);
}
/* Entries are identical if they refer to the same pseudo. */
inline bool
dead_debug_hash_descr::equal (const dead_debug_global_entry *my,
const dead_debug_global_entry *other)
{
return my->reg == other->reg;
}
/* Maintain a global table of pseudos used in debug insns after their
deaths in other blocks, and debug temps their deathpoint values are
to be bound to. */
struct dead_debug_global
{
/* This hash table that maps pseudos to debug temps. */
hash_table<dead_debug_hash_descr> *htab;
/* For each entry in htab, the bit corresponding to its REGNO will
be set. */
bitmap used;
};
/* Node of a linked list of uses of dead REGs in debug insns. */
struct dead_debug_use
{
df_ref use;
struct dead_debug_use *next;
};
/* Linked list of the above, with a bitmap of the REGs in the
list. */
struct dead_debug_local
{
/* The first dead_debug_use entry in the list. */
struct dead_debug_use *head;
/* A pointer to the global tracking data structure. */
struct dead_debug_global *global;
/* A bitmap that has bits set for each REG used in the
dead_debug_use list, and for each entry in the global hash
table. */
bitmap used;
/* A bitmap that has bits set for each INSN that is to be
rescanned. */
bitmap to_rescan;
};
/* This type controls the behavior of dead_debug_insert_temp WRT
UREGNO and INSN. */
enum debug_temp_where
{
/* Bind a newly-created debug temporary to a REG for UREGNO, and
insert the debug insn before INSN. REG is expected to die at
INSN. */
DEBUG_TEMP_BEFORE_WITH_REG = -1,
/* Bind a newly-created debug temporary to the value INSN stores
in REG, and insert the debug insn before INSN. */
DEBUG_TEMP_BEFORE_WITH_VALUE = 0,
/* Bind a newly-created debug temporary to a REG for UREGNO, and
insert the debug insn after INSN. REG is expected to be set at
INSN. */
DEBUG_TEMP_AFTER_WITH_REG = 1,
/* Like DEBUG_TEMP_AFTER_WITH_REG, but force addition of a debug
temporary even if there is just a single debug use. This is used
on regs that are becoming REG_DEAD on INSN and so uses of the
reg later on are invalid. */
DEBUG_TEMP_AFTER_WITH_REG_FORCE = 2
};
extern void dead_debug_global_init (struct dead_debug_global *, bitmap);
extern void dead_debug_global_finish (struct dead_debug_global *, bitmap);
extern void dead_debug_local_init (struct dead_debug_local *, bitmap,
struct dead_debug_global *);
extern void dead_debug_local_finish (struct dead_debug_local *, bitmap);
extern void dead_debug_add (struct dead_debug_local *, df_ref, unsigned int);
extern int dead_debug_insert_temp (struct dead_debug_local *,
unsigned int uregno, rtx_insn *insn,
enum debug_temp_where);
extern void propagate_for_debug (rtx_insn *, rtx_insn *, rtx, rtx, basic_block);
#endif /* GCC_VALTRACK_H */
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