/* Insn note definitions.
   Copyright (C) 2004-2020 Free Software Foundation, Inc.

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/>.  */

/* This file defines all the codes that may appear in the
   NOTE_LINE_NUMBER field of a NOTE insn for kinds of notes that are
   not line numbers.  Source files define DEF_INSN_NOTE appropriately
   before including this file.

   We are slowly removing the concept of insn-chain notes from the
   compiler.  Adding new codes to this file is STRONGLY DISCOURAGED.
   If you think you need one, look for other ways to express what you
   mean, such as register notes or bits in the basic-block structure.  */

/* Shorthand.  */
#define INSN_NOTE(NAME) DEF_INSN_NOTE (NOTE_INSN_##NAME)

/* This note is used to get rid of an insn when it isn't safe to patch
   the insn out of the chain.  */
INSN_NOTE (DELETED)

/* Generated in place of user-declared labels when they are deleted.  */
INSN_NOTE (DELETED_LABEL)
/* Similarly, but for labels that have been present in debug stmts
   earlier and thus will only appear with -g.  These must use different
   label namespace.  */
INSN_NOTE (DELETED_DEBUG_LABEL)

/* These are used to mark the beginning and end of a lexical block.
   See NOTE_BLOCK and reorder_blocks.  */
INSN_NOTE (BLOCK_BEG)
INSN_NOTE (BLOCK_END)

/* This note indicates the start of the real body of the function,
   i.e. the point just after all of the parms have been moved into
   their homes, etc.  */
INSN_NOTE (FUNCTION_BEG)

/* This marks the point immediately after the last prologue insn.  */
INSN_NOTE (PROLOGUE_END)

/* This marks the point immediately prior to the first epilogue insn.  */
INSN_NOTE (EPILOGUE_BEG)

/* These note where exception handling regions begin and end.
   Uses NOTE_EH_HANDLER to identify the region in question.  */
INSN_NOTE (EH_REGION_BEG)
INSN_NOTE (EH_REGION_END)

/* The location of a variable.  */
INSN_NOTE (VAR_LOCATION)

/* The beginning of a statement.  */
INSN_NOTE (BEGIN_STMT)

/* The entry point for an inlined function.  Its NOTE_BLOCK references
   the lexical block whose abstract origin is the inlined function.  */
INSN_NOTE (INLINE_ENTRY)

/* Record the struct for the following basic block.  Uses
   NOTE_BASIC_BLOCK.  FIXME: Redundant with the basic block pointer
   now included in every insn.  NOTE: If there's no CFG anymore, in other words,
   if BLOCK_FOR_INSN () == NULL, NOTE_BASIC_BLOCK cannot be considered reliable
   anymore.  */
INSN_NOTE (BASIC_BLOCK)

/* Mark the inflection point in the instruction stream where we switch
   between hot and cold text sections.  */
INSN_NOTE (SWITCH_TEXT_SECTIONS)

/* When emitting dwarf2 frame information, contains a directive that
   should be emitted.  */
INSN_NOTE (CFI)

/* When emitting dwarf2 frame information, contains the number of a debug
   label that should be emitted.  */
INSN_NOTE (CFI_LABEL)

/* This note indicates that the function context must be updated if
   the Setjmp/Longjmp exception mechanism is used.  */
INSN_NOTE (UPDATE_SJLJ_CONTEXT)

#undef INSN_NOTE
