542 lines
15 KiB
C
542 lines
15 KiB
C
/* RTL utility routines.
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Copyright (C) 1987, 1988, 1991, 1994, 1997, 1998, 1999, 2000, 2001, 2002,
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2003 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "rtl.h"
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#include "real.h"
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#include "ggc.h"
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#include "errors.h"
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/* Indexed by rtx code, gives number of operands for an rtx with that code.
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Does NOT include rtx header data (code and links). */
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) sizeof FORMAT - 1 ,
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const unsigned char rtx_length[NUM_RTX_CODE] = {
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#include "rtl.def"
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};
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#undef DEF_RTL_EXPR
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/* Indexed by rtx code, gives the name of that kind of rtx, as a C string. */
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) NAME ,
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const char * const rtx_name[NUM_RTX_CODE] = {
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#include "rtl.def" /* rtl expressions are documented here */
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};
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#undef DEF_RTL_EXPR
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/* Indexed by rtx code, gives a sequence of operand-types for
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rtx's of that code. The sequence is a C string in which
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each character describes one operand. */
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const char * const rtx_format[NUM_RTX_CODE] = {
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/* "*" undefined.
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can cause a warning message
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"0" field is unused (or used in a phase-dependent manner)
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prints nothing
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"i" an integer
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prints the integer
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"n" like "i", but prints entries from `note_insn_name'
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"w" an integer of width HOST_BITS_PER_WIDE_INT
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prints the integer
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"s" a pointer to a string
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prints the string
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"S" like "s", but optional:
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the containing rtx may end before this operand
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"T" like "s", but treated specially by the RTL reader;
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only found in machine description patterns.
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"e" a pointer to an rtl expression
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prints the expression
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"E" a pointer to a vector that points to a number of rtl expressions
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prints a list of the rtl expressions
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"V" like "E", but optional:
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the containing rtx may end before this operand
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"u" a pointer to another insn
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prints the uid of the insn.
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"b" is a pointer to a bitmap header.
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"B" is a basic block pointer.
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"t" is a tree pointer. */
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) FORMAT ,
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#include "rtl.def" /* rtl expressions are defined here */
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#undef DEF_RTL_EXPR
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};
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/* Indexed by rtx code, gives a character representing the "class" of
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that rtx code. See rtl.def for documentation on the defined classes. */
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const char rtx_class[NUM_RTX_CODE] = {
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) CLASS,
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#include "rtl.def" /* rtl expressions are defined here */
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#undef DEF_RTL_EXPR
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};
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/* Indexed by rtx code, gives the size of the rtx in bytes. */
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const unsigned char rtx_size[NUM_RTX_CODE] = {
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#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) \
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((ENUM) == CONST_INT || (ENUM) == CONST_DOUBLE \
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? RTX_HDR_SIZE + (sizeof FORMAT - 1) * sizeof (HOST_WIDE_INT) \
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: RTX_HDR_SIZE + (sizeof FORMAT - 1) * sizeof (rtunion)),
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#include "rtl.def"
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#undef DEF_RTL_EXPR
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};
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/* Names for kinds of NOTEs and REG_NOTEs. */
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const char * const note_insn_name[NOTE_INSN_MAX - NOTE_INSN_BIAS] =
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{
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"", "NOTE_INSN_DELETED",
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"NOTE_INSN_BLOCK_BEG", "NOTE_INSN_BLOCK_END",
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"NOTE_INSN_LOOP_BEG", "NOTE_INSN_LOOP_END",
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"NOTE_INSN_LOOP_CONT", "NOTE_INSN_LOOP_VTOP",
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"NOTE_INSN_LOOP_END_TOP_COND", "NOTE_INSN_FUNCTION_END",
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"NOTE_INSN_PROLOGUE_END", "NOTE_INSN_EPILOGUE_BEG",
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"NOTE_INSN_DELETED_LABEL", "NOTE_INSN_FUNCTION_BEG",
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"NOTE_INSN_EH_REGION_BEG", "NOTE_INSN_EH_REGION_END",
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"NOTE_INSN_REPEATED_LINE_NUMBER",
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"NOTE_INSN_BASIC_BLOCK", "NOTE_INSN_EXPECTED_VALUE",
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"NOTE_INSN_PREDICTION"
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};
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const char * const reg_note_name[] =
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{
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"", "REG_DEAD", "REG_INC", "REG_EQUIV", "REG_EQUAL",
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"REG_RETVAL", "REG_LIBCALL", "REG_NONNEG",
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"REG_NO_CONFLICT", "REG_UNUSED", "REG_CC_SETTER", "REG_CC_USER",
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"REG_LABEL", "REG_DEP_ANTI", "REG_DEP_OUTPUT", "REG_BR_PROB",
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"REG_VALUE_PROFILE", "REG_NOALIAS", "REG_SAVE_AREA", "REG_BR_PRED",
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"REG_FRAME_RELATED_EXPR", "REG_EH_CONTEXT", "REG_EH_REGION",
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"REG_SAVE_NOTE", "REG_MAYBE_DEAD", "REG_NORETURN",
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"REG_NON_LOCAL_GOTO", "REG_SETJMP", "REG_ALWAYS_RETURN",
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"REG_VTABLE_REF"
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};
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#ifdef GATHER_STATISTICS
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static int rtx_alloc_counts[(int) LAST_AND_UNUSED_RTX_CODE];
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static int rtx_alloc_sizes[(int) LAST_AND_UNUSED_RTX_CODE];
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static int rtvec_alloc_counts;
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static int rtvec_alloc_sizes;
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#endif
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/* Allocate an rtx vector of N elements.
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Store the length, and initialize all elements to zero. */
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rtvec
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rtvec_alloc (int n)
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{
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rtvec rt;
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rt = ggc_alloc_rtvec (n);
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/* clear out the vector */
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memset (&rt->elem[0], 0, n * sizeof (rtx));
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PUT_NUM_ELEM (rt, n);
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#ifdef GATHER_STATISTICS
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rtvec_alloc_counts++;
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rtvec_alloc_sizes += n * sizeof (rtx);
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#endif
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return rt;
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}
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/* Allocate an rtx of code CODE. The CODE is stored in the rtx;
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all the rest is initialized to zero. */
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rtx
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rtx_alloc (RTX_CODE code)
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{
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rtx rt;
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rt = ggc_alloc_rtx (code);
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/* We want to clear everything up to the FLD array. Normally, this
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is one int, but we don't want to assume that and it isn't very
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portable anyway; this is. */
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memset (rt, 0, RTX_HDR_SIZE);
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PUT_CODE (rt, code);
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#ifdef GATHER_STATISTICS
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rtx_alloc_counts[code]++;
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rtx_alloc_sizes[code] += RTX_SIZE (code);
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#endif
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return rt;
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}
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/* Create a new copy of an rtx.
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Recursively copies the operands of the rtx,
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except for those few rtx codes that are sharable. */
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rtx
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copy_rtx (rtx orig)
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{
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rtx copy;
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int i, j;
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RTX_CODE code;
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const char *format_ptr;
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code = GET_CODE (orig);
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switch (code)
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{
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case REG:
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case QUEUED:
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case CONST_INT:
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case CONST_DOUBLE:
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case CONST_VECTOR:
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case SYMBOL_REF:
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case CODE_LABEL:
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case PC:
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case CC0:
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case SCRATCH:
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/* SCRATCH must be shared because they represent distinct values. */
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case ADDRESSOF:
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return orig;
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case CONST:
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/* CONST can be shared if it contains a SYMBOL_REF. If it contains
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a LABEL_REF, it isn't sharable. */
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if (GET_CODE (XEXP (orig, 0)) == PLUS
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&& GET_CODE (XEXP (XEXP (orig, 0), 0)) == SYMBOL_REF
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&& GET_CODE (XEXP (XEXP (orig, 0), 1)) == CONST_INT)
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return orig;
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break;
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/* A MEM with a constant address is not sharable. The problem is that
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the constant address may need to be reloaded. If the mem is shared,
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then reloading one copy of this mem will cause all copies to appear
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to have been reloaded. */
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default:
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break;
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}
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copy = rtx_alloc (code);
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/* Copy the various flags, and other information. We assume that
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all fields need copying, and then clear the fields that should
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not be copied. That is the sensible default behavior, and forces
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us to explicitly document why we are *not* copying a flag. */
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memcpy (copy, orig, RTX_HDR_SIZE);
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/* We do not copy the USED flag, which is used as a mark bit during
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walks over the RTL. */
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RTX_FLAG (copy, used) = 0;
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/* We do not copy FRAME_RELATED for INSNs. */
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if (GET_RTX_CLASS (code) == 'i')
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RTX_FLAG (copy, frame_related) = 0;
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RTX_FLAG (copy, jump) = RTX_FLAG (orig, jump);
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RTX_FLAG (copy, call) = RTX_FLAG (orig, call);
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format_ptr = GET_RTX_FORMAT (GET_CODE (copy));
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for (i = 0; i < GET_RTX_LENGTH (GET_CODE (copy)); i++)
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{
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copy->u.fld[i] = orig->u.fld[i];
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switch (*format_ptr++)
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{
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case 'e':
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if (XEXP (orig, i) != NULL)
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XEXP (copy, i) = copy_rtx (XEXP (orig, i));
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break;
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case 'E':
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case 'V':
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if (XVEC (orig, i) != NULL)
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{
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XVEC (copy, i) = rtvec_alloc (XVECLEN (orig, i));
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for (j = 0; j < XVECLEN (copy, i); j++)
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XVECEXP (copy, i, j) = copy_rtx (XVECEXP (orig, i, j));
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}
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break;
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case 't':
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case 'w':
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case 'i':
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case 's':
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case 'S':
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case 'T':
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case 'u':
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case 'B':
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case '0':
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/* These are left unchanged. */
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break;
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default:
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abort ();
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}
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}
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return copy;
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}
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/* Create a new copy of an rtx. Only copy just one level. */
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rtx
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shallow_copy_rtx (rtx orig)
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{
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rtx copy;
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copy = ggc_alloc_rtx (GET_CODE (orig));
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memcpy (copy, orig, RTX_SIZE (GET_CODE (orig)));
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return copy;
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}
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/* This is 1 until after the rtl generation pass. */
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int rtx_equal_function_value_matters;
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/* Nonzero when we are generating CONCATs. */
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int generating_concat_p;
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/* Return 1 if X and Y are identical-looking rtx's.
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This is the Lisp function EQUAL for rtx arguments. */
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int
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rtx_equal_p (rtx x, rtx y)
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{
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int i;
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int j;
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enum rtx_code code;
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const char *fmt;
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if (x == y)
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return 1;
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if (x == 0 || y == 0)
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return 0;
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code = GET_CODE (x);
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/* Rtx's of different codes cannot be equal. */
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if (code != GET_CODE (y))
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return 0;
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/* (MULT:SI x y) and (MULT:HI x y) are NOT equivalent.
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(REG:SI x) and (REG:HI x) are NOT equivalent. */
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if (GET_MODE (x) != GET_MODE (y))
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return 0;
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/* Some RTL can be compared nonrecursively. */
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switch (code)
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{
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case REG:
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/* Until rtl generation is complete, don't consider a reference
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to the return register of the current function the same as
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the return from a called function. This eases the job of
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function integration. Once the distinction is no longer
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needed, they can be considered equivalent. */
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return (REGNO (x) == REGNO (y)
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&& (! rtx_equal_function_value_matters
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|| REG_FUNCTION_VALUE_P (x) == REG_FUNCTION_VALUE_P (y)));
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case LABEL_REF:
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return XEXP (x, 0) == XEXP (y, 0);
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case SYMBOL_REF:
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return XSTR (x, 0) == XSTR (y, 0);
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case SCRATCH:
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case CONST_DOUBLE:
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case CONST_INT:
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case CONST_VECTOR:
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return 0;
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default:
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break;
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}
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/* Compare the elements. If any pair of corresponding elements
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fail to match, return 0 for the whole thing. */
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fmt = GET_RTX_FORMAT (code);
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for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
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{
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switch (fmt[i])
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{
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case 'w':
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if (XWINT (x, i) != XWINT (y, i))
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return 0;
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break;
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case 'n':
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case 'i':
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if (XINT (x, i) != XINT (y, i))
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return 0;
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break;
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case 'V':
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case 'E':
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/* Two vectors must have the same length. */
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if (XVECLEN (x, i) != XVECLEN (y, i))
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return 0;
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/* And the corresponding elements must match. */
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for (j = 0; j < XVECLEN (x, i); j++)
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if (rtx_equal_p (XVECEXP (x, i, j), XVECEXP (y, i, j)) == 0)
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return 0;
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break;
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case 'e':
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if (rtx_equal_p (XEXP (x, i), XEXP (y, i)) == 0)
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return 0;
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break;
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case 'S':
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case 's':
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if ((XSTR (x, i) || XSTR (y, i))
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&& (! XSTR (x, i) || ! XSTR (y, i)
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|| strcmp (XSTR (x, i), XSTR (y, i))))
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return 0;
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break;
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case 'u':
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/* These are just backpointers, so they don't matter. */
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break;
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case '0':
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case 't':
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break;
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/* It is believed that rtx's at this level will never
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contain anything but integers and other rtx's,
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except for within LABEL_REFs and SYMBOL_REFs. */
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default:
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abort ();
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}
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}
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return 1;
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}
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void dump_rtx_statistics (void)
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{
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#ifdef GATHER_STATISTICS
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int i;
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int total_counts = 0;
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int total_sizes = 0;
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fprintf (stderr, "\nRTX Kind Count Bytes\n");
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fprintf (stderr, "---------------------------------------\n");
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for (i = 0; i < LAST_AND_UNUSED_RTX_CODE; i++)
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if (rtx_alloc_counts[i])
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{
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fprintf (stderr, "%-20s %7d %10d\n", GET_RTX_NAME (i),
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rtx_alloc_counts[i], rtx_alloc_sizes[i]);
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total_counts += rtx_alloc_counts[i];
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total_sizes += rtx_alloc_sizes[i];
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}
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if (rtvec_alloc_counts)
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{
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fprintf (stderr, "%-20s %7d %10d\n", "rtvec",
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rtvec_alloc_counts, rtvec_alloc_sizes);
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total_counts += rtvec_alloc_counts;
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total_sizes += rtvec_alloc_sizes;
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}
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fprintf (stderr, "---------------------------------------\n");
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fprintf (stderr, "%-20s %7d %10d\n",
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"Total", total_counts, total_sizes);
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fprintf (stderr, "---------------------------------------\n");
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#endif
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}
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#if defined ENABLE_RTL_CHECKING && (GCC_VERSION >= 2007)
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void
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rtl_check_failed_bounds (rtx r, int n, const char *file, int line,
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const char *func)
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{
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internal_error
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("RTL check: access of elt %d of `%s' with last elt %d in %s, at %s:%d",
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n, GET_RTX_NAME (GET_CODE (r)), GET_RTX_LENGTH (GET_CODE (r)) - 1,
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func, trim_filename (file), line);
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}
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void
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rtl_check_failed_type1 (rtx r, int n, int c1, const char *file, int line,
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const char *func)
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{
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internal_error
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("RTL check: expected elt %d type '%c', have '%c' (rtx %s) in %s, at %s:%d",
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n, c1, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
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func, trim_filename (file), line);
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}
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void
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rtl_check_failed_type2 (rtx r, int n, int c1, int c2, const char *file,
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int line, const char *func)
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{
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internal_error
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("RTL check: expected elt %d type '%c' or '%c', have '%c' (rtx %s) in %s, at %s:%d",
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n, c1, c2, GET_RTX_FORMAT (GET_CODE (r))[n], GET_RTX_NAME (GET_CODE (r)),
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func, trim_filename (file), line);
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}
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void
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rtl_check_failed_code1 (rtx r, enum rtx_code code, const char *file,
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int line, const char *func)
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{
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internal_error ("RTL check: expected code `%s', have `%s' in %s, at %s:%d",
|
||
GET_RTX_NAME (code), GET_RTX_NAME (GET_CODE (r)), func,
|
||
trim_filename (file), line);
|
||
}
|
||
|
||
void
|
||
rtl_check_failed_code2 (rtx r, enum rtx_code code1, enum rtx_code code2,
|
||
const char *file, int line, const char *func)
|
||
{
|
||
internal_error
|
||
("RTL check: expected code `%s' or `%s', have `%s' in %s, at %s:%d",
|
||
GET_RTX_NAME (code1), GET_RTX_NAME (code2), GET_RTX_NAME (GET_CODE (r)),
|
||
func, trim_filename (file), line);
|
||
}
|
||
|
||
/* XXX Maybe print the vector? */
|
||
void
|
||
rtvec_check_failed_bounds (rtvec r, int n, const char *file, int line,
|
||
const char *func)
|
||
{
|
||
internal_error
|
||
("RTL check: access of elt %d of vector with last elt %d in %s, at %s:%d",
|
||
n, GET_NUM_ELEM (r) - 1, func, trim_filename (file), line);
|
||
}
|
||
#endif /* ENABLE_RTL_CHECKING */
|
||
|
||
#if defined ENABLE_RTL_FLAG_CHECKING
|
||
void
|
||
rtl_check_failed_flag (const char *name, rtx r, const char *file,
|
||
int line, const char *func)
|
||
{
|
||
internal_error
|
||
("RTL flag check: %s used with unexpected rtx code `%s' in %s, at %s:%d",
|
||
name, GET_RTX_NAME (GET_CODE (r)), func, trim_filename (file), line);
|
||
}
|
||
#endif /* ENABLE_RTL_FLAG_CHECKING */
|