749 lines
28 KiB
C
749 lines
28 KiB
C
/* Register Transfer Language (RTL) definitions for GNU C-Compiler
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Copyright (C) 1987-1991 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "machmode.h"
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#undef FFS /* Some systems predefine this symbol; don't let it interfere. */
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/* Register Transfer Language EXPRESSIONS CODES */
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#define RTX_CODE enum rtx_code
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enum rtx_code {
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) ENUM ,
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#include "rtl.def" /* rtl expressions are documented here */
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#undef DEF_RTL_EXPR
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LAST_AND_UNUSED_RTX_CODE}; /* A convienent way to get a value for
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NUM_RTX_CODE.
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Assumes default enum value assignement. */
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#define NUM_RTX_CODE ((int)LAST_AND_UNUSED_RTX_CODE)
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/* The cast here, saves many elsewhere. */
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extern int rtx_length[];
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#define GET_RTX_LENGTH(CODE) (rtx_length[(int)(CODE)])
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extern char *rtx_name[];
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#define GET_RTX_NAME(CODE) (rtx_name[(int)(CODE)])
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extern char *rtx_format[];
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#define GET_RTX_FORMAT(CODE) (rtx_format[(int)(CODE)])
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extern char rtx_class[];
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#define GET_RTX_CLASS(CODE) (rtx_class[(int)(CODE)])
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/* Common union for an element of an rtx. */
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typedef union rtunion_def
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{
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int rtint;
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char *rtstr;
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struct rtx_def *rtx;
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struct rtvec_def *rtvec;
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enum machine_mode rttype;
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} rtunion;
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/* RTL expression ("rtx"). */
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typedef struct rtx_def
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{
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#ifdef ONLY_INT_FIELDS
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unsigned short code;
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#else
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/* The kind of expression this is. */
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enum rtx_code code : 16;
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#endif
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/* The kind of value the expression has. */
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#ifdef ONLY_INT_FIELDS
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int mode : 8;
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#else
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enum machine_mode mode : 8;
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#endif
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/* 1 in an INSN if it can alter flow of control
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within this function. Not yet used! */
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unsigned int jump : 1;
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/* 1 in an INSN if it can call another function. Not yet used! */
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unsigned int call : 1;
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/* 1 in a MEM or REG if value of this expression will never change
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during the current function, even though it is not
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manifestly constant.
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1 in a SYMBOL_REF if it addresses something in the per-function
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constants pool.
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1 in a CALL_INSN if it is a const call.
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1 in a JUMP_INSN if it is a branch that should be annulled. Valid from
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reorg until end of compilation; cleared before used. */
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unsigned int unchanging : 1;
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/* 1 in a MEM expression if contents of memory are volatile.
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1 in an INSN, CALL_INSN, JUMP_INSN, CODE_LABEL or BARRIER
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if it is deleted.
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1 in a REG expression if corresponds to a variable declared by the user.
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0 for an internally generated temporary.
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In a SYMBOL_REF, this flag is used for machine-specific purposes. */
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unsigned int volatil : 1;
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/* 1 in a MEM referring to a field of a structure (not a union!).
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0 if the MEM was a variable or the result of a * operator in C;
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1 if it was the result of a . or -> operator (on a struct) in C.
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1 in a REG if the register is used only in exit code a loop.
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1 in a CODE_LABEL if the label is used for nonlocal gotos
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and must not be deleted even if its count is zero.
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1 in a LABEL_REF if this is a reference to a label outside the
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current loop.
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1 in an INSN, JUMP_INSN, or CALL_INSN if this insn must be scheduled
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together with the preceeding insn. Valid only within sched.
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1 in an INSN, JUMP_INSN, or CALL_INSN if insn is in a delay slot and
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from the target of a branch. Valid from reorg until end of compilation;
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cleared before used. */
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unsigned int in_struct : 1;
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/* 1 if this rtx is used. This is used for copying shared structure.
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See `unshare_all_rtl'.
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In a REG, this is not needed for that purpose, and used instead
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in `leaf_renumber_regs_insn'.
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In a SYMBOL_REF, means that emit_library_call
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has used it as the function. */
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unsigned int used : 1;
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/* Nonzero if this rtx came from procedure integration.
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In a REG, nonzero means this reg refers to the return value
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of the current function. */
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unsigned integrated : 1;
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/* The first element of the operands of this rtx.
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The number of operands and their types are controlled
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by the `code' field, according to rtl.def. */
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rtunion fld[1];
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} *rtx;
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#define NULL_RTX (rtx) 0
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/* Define macros to access the `code' field of the rtx. */
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#ifdef SHORT_ENUM_BUG
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#define GET_CODE(RTX) ((enum rtx_code) ((RTX)->code))
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#define PUT_CODE(RTX, CODE) ((RTX)->code = ((short) (CODE)))
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#else
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#define GET_CODE(RTX) ((RTX)->code)
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#define PUT_CODE(RTX, CODE) ((RTX)->code = (CODE))
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#endif
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#define GET_MODE(RTX) ((RTX)->mode)
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#define PUT_MODE(RTX, MODE) ((RTX)->mode = (MODE))
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#define RTX_INTEGRATED_P(RTX) ((RTX)->integrated)
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#define RTX_UNCHANGING_P(RTX) ((RTX)->unchanging)
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/* RTL vector. These appear inside RTX's when there is a need
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for a variable number of things. The principle use is inside
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PARALLEL expressions. */
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typedef struct rtvec_def{
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unsigned num_elem; /* number of elements */
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rtunion elem[1];
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} *rtvec;
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#define NULL_RTVEC (rtvec) 0
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#define GET_NUM_ELEM(RTVEC) ((RTVEC)->num_elem)
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#define PUT_NUM_ELEM(RTVEC, NUM) ((RTVEC)->num_elem = (unsigned) NUM)
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#define RTVEC_ELT(RTVEC, I) ((RTVEC)->elem[(I)].rtx)
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/* 1 if X is a REG. */
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#define REG_P(X) (GET_CODE (X) == REG)
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/* 1 if X is a constant value that is an integer. */
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#define CONSTANT_P(X) \
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(GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF \
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|| GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE \
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|| GET_CODE (X) == CONST || GET_CODE (X) == HIGH)
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/* General accessor macros for accessing the fields of an rtx. */
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#define XEXP(RTX, N) ((RTX)->fld[N].rtx)
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#define XINT(RTX, N) ((RTX)->fld[N].rtint)
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#define XSTR(RTX, N) ((RTX)->fld[N].rtstr)
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#define XVEC(RTX, N) ((RTX)->fld[N].rtvec)
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#define XVECLEN(RTX, N) ((RTX)->fld[N].rtvec->num_elem)
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#define XVECEXP(RTX,N,M)((RTX)->fld[N].rtvec->elem[M].rtx)
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/* ACCESS MACROS for particular fields of insns. */
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/* Holds a unique number for each insn.
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These are not necessarily sequentially increasing. */
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#define INSN_UID(INSN) ((INSN)->fld[0].rtint)
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/* Chain insns together in sequence. */
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#define PREV_INSN(INSN) ((INSN)->fld[1].rtx)
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#define NEXT_INSN(INSN) ((INSN)->fld[2].rtx)
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/* The body of an insn. */
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#define PATTERN(INSN) ((INSN)->fld[3].rtx)
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/* Code number of instruction, from when it was recognized.
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-1 means this instruction has not been recognized yet. */
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#define INSN_CODE(INSN) ((INSN)->fld[4].rtint)
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/* Set up in flow.c; empty before then.
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Holds a chain of INSN_LIST rtx's whose first operands point at
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previous insns with direct data-flow connections to this one.
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That means that those insns set variables whose next use is in this insn.
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They are always in the same basic block as this insn. */
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#define LOG_LINKS(INSN) ((INSN)->fld[5].rtx)
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/* 1 if insn has been deleted. */
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#define INSN_DELETED_P(INSN) ((INSN)->volatil)
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/* 1 if insn is a call to a const function. */
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#define CONST_CALL_P(INSN) ((INSN)->unchanging)
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/* 1 if insn is a branch that should not unconditionally execute its
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delay slots, i.e., it is an annulled branch. */
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#define INSN_ANNULLED_BRANCH_P(INSN) ((INSN)->unchanging)
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/* 1 if insn is in a delay slot and is from the target of the branch. If
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the branch insn has INSN_ANULLED_BRANCH_P set, this insn should only be
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executed if the branch is taken. For annulled branches with this bit
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clear, the insn should be executed only if the branch is not taken. */
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#define INSN_FROM_TARGET_P(INSN) ((INSN)->in_struct)
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/* Holds a list of notes on what this insn does to various REGs.
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It is a chain of EXPR_LIST rtx's, where the second operand
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is the chain pointer and the first operand is the REG being described.
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The mode field of the EXPR_LIST contains not a real machine mode
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but a value that says what this note says about the REG:
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REG_DEAD means that the value in REG dies in this insn (i.e., it is
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not needed past this insn). If REG is set in this insn, the REG_DEAD
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note may, but need not, be omitted.
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REG_INC means that the REG is autoincremented or autodecremented.
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REG_EQUIV describes the insn as a whole; it says that the
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insn sets a register to a constant value or to be equivalent to
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a memory address. If the
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register is spilled to the stack then the constant value
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should be substituted for it. The contents of the REG_EQUIV
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is the constant value or memory address, which may be different
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from the source of the SET although it has the same value.
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REG_EQUAL is like REG_EQUIV except that the destination
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is only momentarily equal to the specified rtx. Therefore, it
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cannot be used for substitution; but it can be used for cse.
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REG_RETVAL means that this insn copies the return-value of
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a library call out of the hard reg for return values. This note
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is actually an INSN_LIST and it points to the first insn involved
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in setting up arguments for the call. flow.c uses this to delete
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the entire library call when its result is dead.
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REG_LIBCALL is the inverse of REG_RETVAL: it goes on the first insn
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of the library call and points at the one that has the REG_RETVAL.
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REG_WAS_0 says that the register set in this insn held 0 before the insn.
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The contents of the note is the insn that stored the 0.
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If that insn is deleted or patched to a NOTE, the REG_WAS_0 is inoperative.
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The REG_WAS_0 note is actually an INSN_LIST, not an EXPR_LIST.
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REG_NONNEG means that the register is always nonnegative during
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the containing loop. This is used in branches so that decrement and
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branch instructions terminating on zero can be matched. There must be
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an insn pattern in the md file named `decrement_and_branch_until_zero'
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or else this will never be added to any instructions.
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REG_NO_CONFLICT means there is no conflict *after this insn*
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between the register in the note and the destination of this insn.
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REG_UNUSED identifies a register set in this insn and never used.
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REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
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CC0, respectively. Normally, these are required to be consecutive insns,
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but we permit putting a cc0-setting insn in the delay slot of a branch
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as long as only one copy of the insn exists. In that case, these notes
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point from one to the other to allow code generation to determine what
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any require information and to properly update CC_STATUS.
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REG_LABEL points to a CODE_LABEL. Used by non-JUMP_INSNs to
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say that the CODE_LABEL contained in the REG_LABEL note is used
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by the insn.
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REG_DEP_ANTI is used in LOG_LINKS which represent anti (write after read)
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dependencies. REG_DEP_OUTPUT is used in LOG_LINKS which represent output
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(write after write) dependencies. Data dependencies, which are the only
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type of LOG_LINK created by flow, are represented by a 0 reg note kind. */
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#define REG_NOTES(INSN) ((INSN)->fld[6].rtx)
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/* Don't forget to change reg_note_name in rtl.c. */
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enum reg_note { REG_DEAD = 1, REG_INC = 2, REG_EQUIV = 3, REG_WAS_0 = 4,
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REG_EQUAL = 5, REG_RETVAL = 6, REG_LIBCALL = 7,
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REG_NONNEG = 8, REG_NO_CONFLICT = 9, REG_UNUSED = 10,
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REG_CC_SETTER = 11, REG_CC_USER = 12, REG_LABEL = 13,
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REG_DEP_ANTI = 14, REG_DEP_OUTPUT = 15 };
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/* Define macros to extract and insert the reg-note kind in an EXPR_LIST. */
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#define REG_NOTE_KIND(LINK) ((enum reg_note) GET_MODE (LINK))
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#define PUT_REG_NOTE_KIND(LINK,KIND) PUT_MODE(LINK, (enum machine_mode) (KIND))
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/* Names for REG_NOTE's in EXPR_LIST insn's. */
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extern char *reg_note_name[];
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#define GET_REG_NOTE_NAME(MODE) (reg_note_name[(int)(MODE)])
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/* The label-number of a code-label. The assembler label
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is made from `L' and the label-number printed in decimal.
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Label numbers are unique in a compilation. */
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#define CODE_LABEL_NUMBER(INSN) ((INSN)->fld[3].rtint)
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#define LINE_NUMBER NOTE
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/* In a NOTE that is a line number, this is a string for the file name
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that the line is in. */
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#define NOTE_SOURCE_FILE(INSN) ((INSN)->fld[3].rtstr)
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/* In a NOTE that is a line number, this is the line number.
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Other kinds of NOTEs are identified by negative numbers here. */
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#define NOTE_LINE_NUMBER(INSN) ((INSN)->fld[4].rtint)
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/* Codes that appear in the NOTE_LINE_NUMBER field
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for kinds of notes that are not line numbers. */
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/* This note indicates the end of the real body of the function,
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after moving the parms into their homes, etc. */
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#define NOTE_INSN_FUNCTION_BEG 0
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/* This note is used to get rid of an insn
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when it isn't safe to patch the insn out of the chain. */
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#define NOTE_INSN_DELETED -1
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#define NOTE_INSN_BLOCK_BEG -2
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#define NOTE_INSN_BLOCK_END -3
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#define NOTE_INSN_LOOP_BEG -4
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#define NOTE_INSN_LOOP_END -5
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/* This kind of note is generated at the end of the function body,
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just before the return insn or return label.
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In an optimizing compilation it is deleted by the first jump optimization,
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after enabling that optimizer to determine whether control can fall
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off the end of the function body without a return statement. */
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#define NOTE_INSN_FUNCTION_END -6
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/* This kind of note is generated just after each call to `setjmp', et al. */
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#define NOTE_INSN_SETJMP -7
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/* Generated at the place in a loop that `continue' jumps to. */
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#define NOTE_INSN_LOOP_CONT -8
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/* Generated at the start of a duplicated exit test. */
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#define NOTE_INSN_LOOP_VTOP -9
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/* Don't forget to change note_insn_name in rtl.c. */
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#define NOTE_DECL_NAME(INSN) ((INSN)->fld[3].rtstr)
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#define NOTE_DECL_CODE(INSN) ((INSN)->fld[4].rtint)
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#define NOTE_DECL_RTL(INSN) ((INSN)->fld[5].rtx)
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#define NOTE_DECL_IDENTIFIER(INSN) ((INSN)->fld[6].rtint)
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#define NOTE_DECL_TYPE(INSN) ((INSN)->fld[7].rtint)
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/* Names for NOTE insn's other than line numbers. */
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extern char *note_insn_name[];
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#define GET_NOTE_INSN_NAME(NOTE_CODE) (note_insn_name[-(NOTE_CODE)])
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|
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/* The name of a label, in case it corresponds to an explicit label
|
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in the input source code. */
|
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#define LABEL_NAME(LABEL) ((LABEL)->fld[4].rtstr)
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/* In jump.c, each label contains a count of the number
|
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of LABEL_REFs that point at it, so unused labels can be deleted. */
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#define LABEL_NUSES(LABEL) ((LABEL)->fld[5].rtint)
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|
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/* In jump.c, each JUMP_INSN can point to a label that it can jump to,
|
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so that if the JUMP_INSN is deleted, the label's LABEL_NUSES can
|
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be decremented and possibly the label can be deleted. */
|
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#define JUMP_LABEL(INSN) ((INSN)->fld[7].rtx)
|
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|
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/* Once basic blocks are found in flow.c,
|
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each CODE_LABEL starts a chain that goes through
|
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all the LABEL_REFs that jump to that label.
|
||
The chain eventually winds up at the CODE_LABEL; it is circular. */
|
||
#define LABEL_REFS(LABEL) ((LABEL)->fld[5].rtx)
|
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|
||
/* This is the field in the LABEL_REF through which the circular chain
|
||
of references to a particular label is linked.
|
||
This chain is set up in flow.c. */
|
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|
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#define LABEL_NEXTREF(REF) ((REF)->fld[1].rtx)
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|
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/* Once basic blocks are found in flow.c,
|
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Each LABEL_REF points to its containing instruction with this field. */
|
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|
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#define CONTAINING_INSN(RTX) ((RTX)->fld[2].rtx)
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|
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/* For a REG rtx, REGNO extracts the register number. */
|
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#define REGNO(RTX) ((RTX)->fld[0].rtint)
|
||
|
||
/* For a REG rtx, REG_FUNCTION_VALUE_P is nonzero if the reg
|
||
is the current function's return value. */
|
||
|
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#define REG_FUNCTION_VALUE_P(RTX) ((RTX)->integrated)
|
||
|
||
/* 1 in a REG rtx if it corresponds to a variable declared by the user. */
|
||
#define REG_USERVAR_P(RTX) ((RTX)->volatil)
|
||
|
||
/* For a CONST_INT rtx, INTVAL extracts the integer. */
|
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|
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#define INTVAL(RTX) ((RTX)->fld[0].rtint)
|
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|
||
/* For a SUBREG rtx, SUBREG_REG extracts the value we want a subreg of.
|
||
SUBREG_WORD extracts the word-number. */
|
||
|
||
#define SUBREG_REG(RTX) ((RTX)->fld[0].rtx)
|
||
#define SUBREG_WORD(RTX) ((RTX)->fld[1].rtint)
|
||
|
||
/* Access various components of an ASM_OPERANDS rtx. */
|
||
|
||
#define ASM_OPERANDS_TEMPLATE(RTX) XSTR ((RTX), 0)
|
||
#define ASM_OPERANDS_OUTPUT_CONSTRAINT(RTX) XSTR ((RTX), 1)
|
||
#define ASM_OPERANDS_OUTPUT_IDX(RTX) XINT ((RTX), 2)
|
||
#define ASM_OPERANDS_INPUT_VEC(RTX) XVEC ((RTX), 3)
|
||
#define ASM_OPERANDS_INPUT_CONSTRAINT_VEC(RTX) XVEC ((RTX), 4)
|
||
#define ASM_OPERANDS_INPUT(RTX, N) XVECEXP ((RTX), 3, (N))
|
||
#define ASM_OPERANDS_INPUT_LENGTH(RTX) XVECLEN ((RTX), 3)
|
||
#define ASM_OPERANDS_INPUT_CONSTRAINT(RTX, N) XSTR (XVECEXP ((RTX), 4, (N)), 0)
|
||
#define ASM_OPERANDS_INPUT_MODE(RTX, N) GET_MODE (XVECEXP ((RTX), 4, (N)))
|
||
#define ASM_OPERANDS_SOURCE_FILE(RTX) XSTR ((RTX), 5)
|
||
#define ASM_OPERANDS_SOURCE_LINE(RTX) XINT ((RTX), 6)
|
||
|
||
/* For a MEM rtx, 1 if it's a volatile reference.
|
||
Also in an ASM_OPERANDS rtx. */
|
||
#define MEM_VOLATILE_P(RTX) ((RTX)->volatil)
|
||
|
||
/* For a MEM rtx, 1 if it refers to a structure or union component. */
|
||
#define MEM_IN_STRUCT_P(RTX) ((RTX)->in_struct)
|
||
|
||
/* For a LABEL_REF, 1 means that this reference is to a label outside the
|
||
loop containing the reference. */
|
||
#define LABEL_OUTSIDE_LOOP_P(RTX) ((RTX)->in_struct)
|
||
|
||
/* For a CODE_LABEL, 1 means always consider this label to be needed. */
|
||
#define LABEL_PRESERVE_P(RTX) ((RTX)->in_struct)
|
||
|
||
/* For a REG, 1 means the register is used only in an exit test of a loop. */
|
||
#define REG_LOOP_TEST_P(RTX) ((RTX)->in_struct)
|
||
|
||
/* During sched, for an insn, 1 means that the insn must be scheduled together
|
||
with the preceeding insn. */
|
||
#define SCHED_GROUP_P(INSN) ((INSN)->in_struct)
|
||
|
||
/* For a SET rtx, SET_DEST is the place that is set
|
||
and SET_SRC is the value it is set to. */
|
||
#define SET_DEST(RTX) ((RTX)->fld[0].rtx)
|
||
#define SET_SRC(RTX) ((RTX)->fld[1].rtx)
|
||
|
||
/* For a TRAP_IF rtx, TRAP_CONDITION is an expression. */
|
||
#define TRAP_CONDITION(RTX) ((RTX)->fld[0].rtx)
|
||
|
||
/* 1 in a SYMBOL_REF if it addresses this function's constants pool. */
|
||
#define CONSTANT_POOL_ADDRESS_P(RTX) ((RTX)->unchanging)
|
||
|
||
/* Flag in a SYMBOL_REF for machine-specific purposes. */
|
||
#define SYMBOL_REF_FLAG(RTX) ((RTX)->volatil)
|
||
|
||
/* 1 means a SYMBOL_REF has been the library function in emit_library_call. */
|
||
#define SYMBOL_REF_USED(RTX) ((RTX)->used)
|
||
|
||
/* For an INLINE_HEADER rtx, FIRST_FUNCTION_INSN is the first insn
|
||
of the function that is not involved in copying parameters to
|
||
pseudo-registers. FIRST_PARM_INSN is the very first insn of
|
||
the function, including the parameter copying.
|
||
We keep this around in case we must splice
|
||
this function into the assembly code at the end of the file.
|
||
FIRST_LABELNO is the first label number used by the function (inclusive).
|
||
LAST_LABELNO is the last label used by the function (exclusive).
|
||
MAX_REGNUM is the largest pseudo-register used by that function.
|
||
FUNCTION_ARGS_SIZE is the size of the argument block in the stack.
|
||
POPS_ARGS is the number of bytes of input arguments popped by the function
|
||
STACK_SLOT_LIST is the list of stack slots.
|
||
FUNCTION_FLAGS are where single-bit flags are saved.
|
||
OUTGOING_ARGS_SIZE is the size of the largest outgoing stack parameter list.
|
||
ORIGINAL_ARG_VECTOR is a vector of the original DECL_RTX values
|
||
for the function arguments.
|
||
ORIGINAL_DECL_INITIAL is a pointer to the original DECL_INITIAL for the
|
||
function.
|
||
|
||
We want this to lay down like an INSN. The PREV_INSN field
|
||
is always NULL. The NEXT_INSN field always points to the
|
||
first function insn of the function being squirreled away. */
|
||
|
||
#define FIRST_FUNCTION_INSN(RTX) ((RTX)->fld[2].rtx)
|
||
#define FIRST_PARM_INSN(RTX) ((RTX)->fld[3].rtx)
|
||
#define FIRST_LABELNO(RTX) ((RTX)->fld[4].rtint)
|
||
#define LAST_LABELNO(RTX) ((RTX)->fld[5].rtint)
|
||
#define MAX_PARMREG(RTX) ((RTX)->fld[6].rtint)
|
||
#define MAX_REGNUM(RTX) ((RTX)->fld[7].rtint)
|
||
#define FUNCTION_ARGS_SIZE(RTX) ((RTX)->fld[8].rtint)
|
||
#define POPS_ARGS(RTX) ((RTX)->fld[9].rtint)
|
||
#define STACK_SLOT_LIST(RTX) ((RTX)->fld[10].rtx)
|
||
#define FUNCTION_FLAGS(RTX) ((RTX)->fld[11].rtint)
|
||
#define OUTGOING_ARGS_SIZE(RTX) ((RTX)->fld[12].rtint)
|
||
#define ORIGINAL_ARG_VECTOR(RTX) ((RTX)->fld[13].rtvec)
|
||
#define ORIGINAL_DECL_INITIAL(RTX) ((RTX)->fld[14].rtx)
|
||
|
||
/* In FUNCTION_FLAGS we save some variables computed when emitting the code
|
||
for the function and which must be `or'ed into the current flag values when
|
||
insns from that function are being inlined. */
|
||
|
||
/* These ought to be an enum, but non-ANSI compilers don't like that. */
|
||
#define FUNCTION_FLAGS_CALLS_ALLOCA 01
|
||
#define FUNCTION_FLAGS_CALLS_SETJMP 02
|
||
#define FUNCTION_FLAGS_RETURNS_STRUCT 04
|
||
#define FUNCTION_FLAGS_RETURNS_PCC_STRUCT 010
|
||
#define FUNCTION_FLAGS_NEEDS_CONTEXT 020
|
||
#define FUNCTION_FLAGS_HAS_NONLOCAL_LABEL 040
|
||
#define FUNCTION_FLAGS_RETURNS_POINTER 0100
|
||
#define FUNCTION_FLAGS_USES_CONST_POOL 0200
|
||
#define FUNCTION_FLAGS_CALLS_LONGJMP 0400
|
||
#define FUNCTION_FLAGS_USES_PIC_OFFSET_TABLE 01000
|
||
|
||
/* Define a macro to look for REG_INC notes,
|
||
but save time on machines where they never exist. */
|
||
|
||
#if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) \
|
||
|| defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
|
||
#define FIND_REG_INC_NOTE(insn, reg) (find_reg_note ((insn), REG_INC, (reg)))
|
||
#else
|
||
#define FIND_REG_INC_NOTE(insn, reg) 0
|
||
#endif
|
||
|
||
/* Indicate whether the machine has any sort of auto increment addressing.
|
||
If not, we can avoid checking for REG_INC notes. */
|
||
|
||
#if (defined (HAVE_PRE_INCREMENT) || defined (HAVE_PRE_DECREMENT) \
|
||
|| defined (HAVE_POST_INCREMENT) || defined (HAVE_POST_DECREMENT))
|
||
#define AUTO_INC_DEC
|
||
#endif
|
||
|
||
/* Generally useful functions. */
|
||
|
||
extern rtx rtx_alloc ();
|
||
extern rtvec rtvec_alloc ();
|
||
extern rtx find_reg_note ();
|
||
extern rtx find_regno_note ();
|
||
extern int get_integer_term ();
|
||
extern rtx get_related_value ();
|
||
extern rtx single_set ();
|
||
extern rtx find_last_value ();
|
||
extern rtx gen_rtx ();
|
||
extern rtx copy_rtx ();
|
||
extern rtx copy_rtx_if_shared ();
|
||
extern rtx copy_most_rtx ();
|
||
extern rtx replace_rtx ();
|
||
extern rtvec gen_rtvec ();
|
||
extern rtvec gen_rtvec_v ();
|
||
extern rtx gen_reg_rtx ();
|
||
extern rtx gen_label_rtx ();
|
||
extern rtx gen_inline_header_rtx ();
|
||
extern rtx gen_lowpart_common ();
|
||
extern rtx gen_lowpart ();
|
||
extern rtx gen_lowpart_if_possible ();
|
||
extern rtx operand_subword ();
|
||
extern rtx operand_subword_force ();
|
||
extern int subreg_lowpart_p ();
|
||
extern rtx make_safe_from ();
|
||
extern rtx memory_address ();
|
||
extern rtx get_insns ();
|
||
extern rtx get_last_insn ();
|
||
extern rtx get_last_insn_anywhere ();
|
||
extern void start_sequence ();
|
||
extern void push_to_sequence ();
|
||
extern void end_sequence ();
|
||
extern rtx gen_sequence ();
|
||
extern rtx expand_expr ();
|
||
extern rtx output_constant_def ();
|
||
extern rtx immed_real_const ();
|
||
extern rtx immed_real_const_1 ();
|
||
extern rtx immed_double_const ();
|
||
extern rtx force_const_mem ();
|
||
extern rtx get_pool_constant ();
|
||
extern enum machine_mode get_pool_mode ();
|
||
extern int get_pool_offset ();
|
||
extern rtx get_parm_real_loc ();
|
||
extern rtx assign_stack_local ();
|
||
extern rtx assign_stack_temp ();
|
||
extern rtx protect_from_queue ();
|
||
extern void emit_queue ();
|
||
extern rtx emit_move_insn ();
|
||
extern rtx emit_insn_before ();
|
||
extern rtx emit_jump_insn_before ();
|
||
extern rtx emit_call_insn_before ();
|
||
extern rtx emit_barrier_before ();
|
||
extern rtx emit_note_before ();
|
||
extern rtx emit_insn_after ();
|
||
extern rtx emit_jump_insn_after ();
|
||
extern rtx emit_barrier_after ();
|
||
extern rtx emit_label_after ();
|
||
extern rtx emit_note_after ();
|
||
extern rtx emit_line_note_after ();
|
||
extern rtx emit_insn ();
|
||
extern rtx emit_insns ();
|
||
extern rtx emit_insns_before ();
|
||
extern rtx emit_jump_insn ();
|
||
extern rtx emit_call_insn ();
|
||
extern rtx emit_label ();
|
||
extern rtx emit_barrier ();
|
||
extern rtx emit_line_note ();
|
||
extern rtx emit_note ();
|
||
extern rtx emit_line_note_force ();
|
||
extern rtx make_insn_raw ();
|
||
extern rtx previous_insn ();
|
||
extern rtx next_insn ();
|
||
extern rtx prev_nonnote_insn ();
|
||
extern rtx next_nonnote_insn ();
|
||
extern rtx prev_real_insn ();
|
||
extern rtx next_real_insn ();
|
||
extern rtx prev_active_insn ();
|
||
extern rtx next_active_insn ();
|
||
extern rtx prev_label ();
|
||
extern rtx next_label ();
|
||
extern rtx next_cc0_user ();
|
||
extern rtx prev_cc0_setter ();
|
||
extern rtx reg_set_last ();
|
||
extern rtx next_nondeleted_insn ();
|
||
extern enum rtx_code reverse_condition ();
|
||
extern enum rtx_code swap_condition ();
|
||
extern enum rtx_code unsigned_condition ();
|
||
extern enum rtx_code signed_condition ();
|
||
extern rtx plus_constant (), plus_constant_for_output ();
|
||
extern rtx find_equiv_reg ();
|
||
extern rtx delete_insn ();
|
||
extern void delete_jump ();
|
||
extern rtx get_label_before ();
|
||
extern rtx get_label_after ();
|
||
extern rtx follow_jumps ();
|
||
extern rtx adj_offsettable_operand ();
|
||
extern rtx try_split ();
|
||
extern rtx split_insns ();
|
||
extern rtx simplify_unary_operation (), simplify_binary_operation ();
|
||
extern rtx simplify_ternary_operation (), simplify_relational_operation ();
|
||
|
||
/* Maximum number of parallel sets and clobbers in any insn in this fn.
|
||
Always at least 3, since the combiner could put that many togetherm
|
||
and we want this to remain correct for all the remaining passes. */
|
||
|
||
extern int max_parallel;
|
||
|
||
extern int asm_noperands ();
|
||
extern char *decode_asm_operands ();
|
||
|
||
#ifdef BITS_PER_WORD
|
||
/* Conditional is to detect when config.h has been included. */
|
||
extern enum reg_class reg_preferred_class ();
|
||
#endif
|
||
|
||
extern rtx get_first_nonparm_insn ();
|
||
|
||
/* Standard pieces of rtx, to be substituted directly into things. */
|
||
extern rtx pc_rtx;
|
||
extern rtx cc0_rtx;
|
||
extern rtx const0_rtx;
|
||
extern rtx const1_rtx;
|
||
extern rtx constm1_rtx;
|
||
extern rtx const_true_rtx;
|
||
extern rtx fconst0_rtx;
|
||
extern rtx fconst1_rtx;
|
||
extern rtx dconst0_rtx;
|
||
extern rtx dconst1_rtx;
|
||
|
||
/* Returns a constant 0 rtx in mode MODE. */
|
||
|
||
#define CONST0_RTX(MODE) \
|
||
((MODE == SFmode) ? fconst0_rtx \
|
||
: ((MODE == DFmode) ? dconst0_rtx \
|
||
: ((GET_MODE_CLASS (MODE) == MODE_INT) ? const0_rtx \
|
||
: (abort (), NULL_RTX))))
|
||
|
||
/* All references to certain hard regs, except those created
|
||
by allocating pseudo regs into them (when that's possible),
|
||
go through these unique rtx objects. */
|
||
extern rtx stack_pointer_rtx;
|
||
extern rtx frame_pointer_rtx;
|
||
extern rtx arg_pointer_rtx;
|
||
extern rtx pic_offset_table_rtx;
|
||
extern rtx struct_value_rtx;
|
||
extern rtx struct_value_incoming_rtx;
|
||
extern rtx static_chain_rtx;
|
||
extern rtx static_chain_incoming_rtx;
|
||
|
||
/* Virtual registers are used during RTL generation to refer to locations into
|
||
the stack frame when the actual location isn't known until RTL generation
|
||
is complete. The routine instantiate_virtual_regs replaces these with
|
||
the proper value, which is normally {frame,arg,stack}_pointer_rtx plus
|
||
a constant. */
|
||
|
||
#define FIRST_VIRTUAL_REGISTER (FIRST_PSEUDO_REGISTER)
|
||
|
||
/* This points to the first word of the incoming arguments passed on the stack,
|
||
either by the caller or by the callee when pretending it was passed by the
|
||
caller. */
|
||
|
||
extern rtx virtual_incoming_args_rtx;
|
||
|
||
#define VIRTUAL_INCOMING_ARGS_REGNUM (FIRST_VIRTUAL_REGISTER)
|
||
|
||
/* If FRAME_GROWS_DOWNWARDS, this points to immediately above the first
|
||
variable on the stack. Otherwise, it points to the first variable on
|
||
the stack. */
|
||
|
||
extern rtx virtual_stack_vars_rtx;
|
||
|
||
#define VIRTUAL_STACK_VARS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 1)
|
||
|
||
/* This points to the location of dynamically-allocated memory on the stack
|
||
immediately after the stack pointer has been adjusted by the amount
|
||
desired. */
|
||
|
||
extern rtx virtual_stack_dynamic_rtx;
|
||
|
||
#define VIRTUAL_STACK_DYNAMIC_REGNUM ((FIRST_VIRTUAL_REGISTER) + 2)
|
||
|
||
/* This points to the location in the stack at which outgoing arguments should
|
||
be written when the stack is pre-pushed (arguments pushed using push
|
||
insns always use sp). */
|
||
|
||
extern rtx virtual_outgoing_args_rtx;
|
||
|
||
#define VIRTUAL_OUTGOING_ARGS_REGNUM ((FIRST_VIRTUAL_REGISTER) + 3)
|
||
|
||
#define LAST_VIRTUAL_REGISTER ((FIRST_VIRTUAL_REGISTER) + 3)
|
||
|
||
extern rtx find_next_ref ();
|
||
extern rtx *find_single_use ();
|
||
|
||
/* Define a default value for STORE_FLAG_VALUE. */
|
||
|
||
#ifndef STORE_FLAG_VALUE
|
||
#define STORE_FLAG_VALUE 1
|
||
#endif
|
||
|
||
/* Nonzero after end of reload pass.
|
||
Set to 1 or 0 by toplev.c. */
|
||
|
||
extern int reload_completed;
|
||
|
||
/* Set to 1 while reload_as_needed is operating.
|
||
Required by some machines to handle any generated moves differently. */
|
||
|
||
extern int reload_in_progress;
|
||
|
||
/* If this is nonzero, we do not bother generating VOLATILE
|
||
around volatile memory references, and we are willing to
|
||
output indirect addresses. If cse is to follow, we reject
|
||
indirect addresses so a useful potential cse is generated;
|
||
if it is used only once, instruction combination will produce
|
||
the same indirect address eventually. */
|
||
extern int cse_not_expected;
|
||
|
||
/* Indexed by pseudo register number, gives the rtx for that pseudo.
|
||
Allocated in parallel with regno_pointer_flag. */
|
||
extern rtx *regno_reg_rtx;
|