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rtl.h
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1994-02-06
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/* Register Transfer Language (RTL) definitions for GNU C-Compiler
Copyright (C) 1987, 1991, 1992 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC 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 2, or (at your option)
any later version.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "machmode.h"
#undef FFS /* Some systems predefine this symbol; don't let it interfere. */
#undef FLOAT /* Likewise. */
/* Register Transfer Language EXPRESSIONS CODES */
#define RTX_CODE enum rtx_code
enum rtx_code {
#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
#include "rtl.def" /* rtl expressions are documented here */
#undef DEF_RTL_EXPR
LAST_AND_UNUSED_RTX_CODE}; /* A convenient way to get a value for
NUM_RTX_CODE.
Assumes default enum value assignment. */
#define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
/* The cast here, saves many elsewhere. */
extern int rtx_length[];
#define GET_RTX_LENGTH(CODE) (rtx_length[(int)(CODE)])
extern char * const rtx_name[];
#define GET_RTX_NAME(CODE) (rtx_name[(int)(CODE)])
extern char * const rtx_format[];
#define GET_RTX_FORMAT(CODE) (rtx_format[(int)(CODE)])
extern const char rtx_class[];
#define GET_RTX_CLASS(CODE) (rtx_class[(int)(CODE)])
/* Common union for an element of an rtx. */
typedef union rtunion_def
{
HOST_WIDE_INT rtwint;
int rtint;
char *rtstr;
struct rtx_def *rtx;
struct rtvec_def *rtvec;
enum machine_mode rttype;
} rtunion;
/* RTL expression ("rtx"). */
typedef struct rtx_def
{
#ifdef ONLY_INT_FIELDS
#ifdef CODE_FIELD_BUG
unsigned int code : 16;
#else
unsigned short code;
#endif
#else
/* The kind of expression this is. */
enum rtx_code code : 16;
#endif
/* The kind of value the expression has. */
#ifdef ONLY_INT_FIELDS
int mode : 8;
#else
enum machine_mode mode : 8;
#endif
/* 1 in an INSN if it can alter flow of control
within this function. Not yet used! */
unsigned int jump : 1;
/* 1 in an INSN if it can call another function. Not yet used! */
unsigned int call : 1;
/* 1 in a MEM or REG if value of this expression will never change
during the current function, even though it is not
manifestly constant.
1 in a SUBREG if it is from a promoted variable that is unsigned.
1 in a SYMBOL_REF if it addresses something in the per-function
constants pool.
1 in a CALL_INSN if it is a const call.
1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
reorg until end of compilation; cleared before used. */
unsigned int unchanging : 1;
/* 1 in a MEM expression if contents of memory are volatile.
1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
if it is deleted.
1 in a REG expression if corresponds to a variable declared by the user.
0 for an internally generated temporary.
In a SYMBOL_REF, this flag is used for machine-specific purposes.
In a LABEL_REF or in a REG_LABEL note, this is LABEL_REF_NONLOCAL_P. */
unsigned int volatil : 1;
/* 1 in a MEM referring to a field of a structure (not a union!).
0 if the MEM was a variable or the result of a * operator in C;
1 if it was the result of a . or -> operator (on a struct) in C.
1 in a REG if the register is used only in exit code a loop.
1 in a SUBREG expression if was generated from a variable with a
promoted mode.
1 in a CODE_LABEL if the label is used for nonlocal gotos
and must not be deleted even if its count is zero.
1 in a LABEL_REF if this is a reference to a label outside the
current loop.
1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
together with the preceding insn. Valid only within sched.
1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
from the target of a branch. Valid from reorg until end of compilation;
cleared before used. */
unsigned int in_struct : 1;
/* 1 if this rtx is used. This is used for copying shared structure.
See `unshare_all_rtl'.
In a REG, this is not needed for that purpose, and used instead
in `leaf_renumber_regs_insn'.
In a SYMBOL_REF, means that emit_library_call
has used it as the function. */
unsigned int used : 1;
/* Nonzero if this rtx came from procedure integration.
In a REG, nonzero means this reg refers to the return value
of the current function. */
unsigned integrated : 1;
/* The first element of the operands of this rtx.
The number of operands and their types are controlled
by the `code' field, according to rtl.def. */
rtunion fld[1];
} *rtx;
/* Add prototype support. */
#ifndef PROTO
#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
#define PROTO(ARGS) ARGS
#else
#define PROTO(ARGS) ()
#endif
#endif
#define NULL_RTX (rtx) 0
/* Define a generic NULL if one hasn't already been defined. */
#ifndef NULL
#define NULL 0
#endif
#ifndef GENERIC_PTR
#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
#define GENERIC_PTR void *
#else
#define GENERIC_PTR char *
#endif
#endif
#ifndef NULL_PTR
#define NULL_PTR ((GENERIC_PTR)0)
#endif
/* Define macros to access the `code' field of the rtx. */
#ifdef SHORT_ENUM_BUG
#define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
#define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
#else
#define GET_CODE(RTX) ((RTX)->code)
#define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
#endif
#define GET_MODE(RTX) ((RTX)->mode)
#define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
#define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
#define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
/* RTL vector. These appear inside RTX's when there is a need
for a variable number of things. The principle use is inside
PARALLEL expressions. */
typedef struct rtvec_def{
unsigned num_elem; /* number of elements */
rtunion elem[1];
} *rtvec;
#define NULL_RTVEC (rtvec) 0
#define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
#define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM)
#define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
/* 1 if X is a REG. */
#define REG_P(X) (GET_CODE (X) == REG)
/* 1 if X is a constant value that is an integer. */
#define CONSTANT_P(X) \
(GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
|| GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
|| GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
/* General accessor macros for accessing the fields of an rtx. */
#define XEXP(RTX, N) ((RTX)->fld[N].rtx)
#define XINT(RTX, N) ((RTX)->fld[N].rtint)
#define XWINT(RTX, N) ((RTX)->fld[N].rtwint)
#define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
#define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
#define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
#define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
/* ACCESS MACROS for particular fields of insns. */
/* Holds a unique number for each insn.
These are not necessarily sequentially increasing. */
#define INSN_UID(INSN) ((INSN)->fld[0].rtint)
/* Chain insns together in sequence. */
#define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
#define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
/* The body of an insn. */
#define PATTERN(INSN) ((INSN)->fld[3].rtx)
/* Code number of instruction, from when it was recognized.
-1 means this instruction has not been recognized yet. */
#define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
/* Set up in flow.c; empty before then.
Holds a chain of INSN_LIST rtx's whose first operands point at
previous insns with direct data-flow connections to this one.
That means that those insns set variables whose next use i