#include "config.h"#include "system.h"#include "coretypes.h"#include "tm.h"#include "rtl.h"#include "valtrack.h"#include "function.h"#include "regs.h"#include "emit-rtl.h"
Data Structures | |
| struct | rtx_subst_pair |
Functions | |
| static rtx | gen_lowpart_for_debug () |
| static rtx | cleanup_auto_inc_dec () |
| static rtx | propagate_for_debug_subst () |
| void | propagate_for_debug (rtx insn, rtx last, rtx dest, rtx src, basic_block this_basic_block) |
| void | dead_debug_global_init () |
| void | dead_debug_local_init (struct dead_debug_local *debug, bitmap used, struct dead_debug_global *global) |
| static dead_debug_global_entry * | dead_debug_global_find () |
| static dead_debug_global_entry * | dead_debug_global_insert () |
| static bool | dead_debug_global_replace_temp (struct dead_debug_global *global, df_ref use, unsigned int uregno, bitmap *pto_rescan) |
| static void | dead_debug_reset_uses (struct dead_debug_local *debug, struct dead_debug_use *head) |
| static void | dead_debug_promote_uses () |
| void | dead_debug_local_finish () |
| void | dead_debug_global_finish () |
| void | dead_debug_add () |
| int | dead_debug_insert_temp (struct dead_debug_local *debug, unsigned int uregno, rtx insn, enum debug_temp_where where) |
Function Documentation
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Replace auto-increment addressing modes with explicit operations to access the same addresses without modifying the corresponding registers.
| void dead_debug_add | ( | ) |
Add USE to DEBUG, or substitute it right away if it's a pseudo in the global substitution list. USE must be a dead reference to UREGNO in a debug insn. Create a bitmap for DEBUG as needed.
??? If we dealt with split multi-registers below, we should set all registers for the used mode in case of hardware registers.
References bitmap_bit_p, bitmap_clear_bit(), dead_debug_local::global, dead_debug_local::head, NULL, NULL_RTX, dead_debug_global::used, and dead_debug_local::used.
Referenced by df_create_unused_note().
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Locate the entry for REG in GLOBAL->htab.
References hash_table< Descriptor, Allocator >::create(), dead_debug_global_entry::dtemp, hash_table< Descriptor, Allocator >::find_slot(), gcc_checking_assert, dead_debug_global::htab, hash_table< Descriptor, Allocator >::is_created(), and dead_debug_global_entry::reg.
Referenced by dead_debug_global_insert().
| void dead_debug_global_finish | ( | ) |
Release GLOBAL->used unless it is the same as USED. Release the mapping hash table if it was initialized.
| void dead_debug_global_init | ( | ) |
Initialize DEBUG to an empty list, and clear USED, if given.
References BITMAP_ALLOC, dead_debug_local::global, dead_debug_local::head, NULL, dead_debug_local::to_rescan, dead_debug_global::used, and dead_debug_local::used.
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Insert an entry mapping REG to DTEMP in GLOBAL->htab.
References bitmap_bit_p, dead_debug_global_find(), DF_REF_REAL_LOC, gcc_checking_assert, GET_CODE, dead_debug_global_entry::reg, REG_P, REGNO, and dead_debug_global::used.
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If UREGNO, referenced by USE, is a pseudo marked as used in GLOBAL, replace it with with a USE of the debug temp recorded for it, and return TRUE. Otherwise, just return FALSE.
If PTO_RESCAN is given, instead of rescanning modified INSNs right away, add their UIDs to the bitmap, allocating one of *PTO_RESCAN is NULL.
| int dead_debug_insert_temp | ( | struct dead_debug_local * | debug, |
| unsigned int | uregno, | ||
| rtx | insn, | ||
| enum debug_temp_where | where | ||
| ) |
If UREGNO is referenced by any entry in DEBUG, emit a debug insn before or after INSN (depending on WHERE), that binds a (possibly global) debug temp to the widest-mode use of UREGNO, if WHERE is *_WITH_REG, or the value stored in UREGNO by INSN otherwise, and replace all uses of UREGNO in DEBUG with uses of the debug temp. INSN must be where UREGNO dies, if WHERE is *_BEFORE_*, or where it is set otherwise. Return the number of debug insns emitted.
Move all uses of uregno from debug->head to uses, setting mode to the widest referenced mode.
If this loc has been changed e.g. to debug_expr already
as part of a multi-register use, just drop it. We may have dangling bits in debug->used for registers that were part of a multi-register use, one component of which has been reset.
Recover the expression INSN stores in REG.
Lose if the REG-setting insn is a CALL.
??? Should we try to extract it from a PARALLEL?
Cool, it's the same REG, we can use SRC.
Hmm... Something's fishy, we should be setting REG here.
If we're not overwriting all the hardware registers that
setting REG in its mode would, we won't know what to bind
the debug temp to. ??? We could bind the debug_expr to a
CONCAT or PARALLEL with the split multi-registers, and
replace them as we found the corresponding sets. Ok, it's the same (hardware) REG, but with a different
mode, so SUBREG it. We should be setting REG here. Lose.
Lose if we're setting something other than the lowpart of
REG. If we're not overwriting all the hardware registers that
setting REG in its mode would, we won't know what to bind
the debug temp to. Yay, we can use SRC, just adjust its mode.
Oh well, we're out of luck.
We couldn't figure out the value stored in REG, so reset all
of its pending debug uses. If there's a single (debug) use of an otherwise unused REG, and the debug use is not part of a larger expression, then it probably doesn't make sense to introduce a new debug temp.
Create DEBUG_EXPR (and DEBUG_EXPR_DECL).
Emit a debug bind insn before the insn in which reg dies.
Adjust all uses.
??? Should we simplify subreg of subreg?
References DF_REF_REAL_LOC, DF_REF_REGNO, GET_MODE, GET_MODE_BITSIZE, dead_debug_use::next, NULL, REG_P, and dead_debug_use::use.
Referenced by df_create_unused_note().
| void dead_debug_local_finish | ( | ) |
Reset all debug insns with pending uses. Release the bitmap in it, unless it is USED. USED must be the same bitmap passed to dead_debug_local_init.
| void dead_debug_local_init | ( | struct dead_debug_local * | debug, |
| bitmap | used, | ||
| struct dead_debug_global * | global | ||
| ) |
Initialize DEBUG to an empty list, and clear USED, if given. Link back to GLOBAL, if given, and bring in used bits from it.
Referenced by gate_ud_dce().
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Promote pending local uses of pseudos in DEBUG to global substitutions. Uses of non-pseudos are left alone for resetting.
Tentatively remove the USE from the list.
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Reset all debug uses in HEAD, and clear DEBUG->to_rescan bits of each reset insn. DEBUG is not otherwise modified. If HEAD is DEBUG->head, DEBUG->head will be set to NULL at the end. Otherwise, entries from DEBUG->head that pertain to reset insns will be removed, and only then rescanned.
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Infrastructure for tracking user variable locations and values throughout compilation. Copyright (C) 2010-2013 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/. gen_lowpart_no_emit hook implementation for DEBUG_INSNs. In DEBUG_INSNs, all lowpart SUBREGs are valid, despite what the machine requires for instructions.
| void propagate_for_debug | ( | rtx | insn, |
| rtx | last, | ||
| rtx | dest, | ||
| rtx | src, | ||
| basic_block | this_basic_block | ||
| ) |
Replace all the occurrences of DEST with SRC in DEBUG_INSNs between INSN and LAST, not including INSN, but including LAST. Also stop at the end of THIS_BASIC_BLOCK.
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DATA points to an rtx_subst_pair. Return the value that should be substituted.
