285 lines
11 KiB
C
285 lines
11 KiB
C
/* Generate attribute information (insn-attr.h) from machine description.
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Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004
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Free Software Foundation, Inc.
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Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
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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, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "bconfig.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 "errors.h"
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#include "gensupport.h"
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static void write_upcase (const char *);
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static void gen_attr (rtx);
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static void
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write_upcase (const char *str)
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{
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for (; *str; str++)
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putchar (TOUPPER(*str));
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}
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static void
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gen_attr (rtx attr)
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{
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const char *p, *tag;
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int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
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printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
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/* If numeric attribute, don't need to write an enum. */
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p = XSTR (attr, 1);
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if (*p == '\0')
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printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0),
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(is_const ? "void" : "rtx"));
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else
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{
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printf ("enum attr_%s {", XSTR (attr, 0));
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while ((tag = scan_comma_elt (&p)) != 0)
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{
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write_upcase (XSTR (attr, 0));
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putchar ('_');
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while (tag != p)
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putchar (TOUPPER (*tag++));
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if (*p == ',')
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fputs (", ", stdout);
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}
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fputs ("};\n", stdout);
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printf ("extern enum attr_%s get_attr_%s (%s);\n\n",
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XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
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}
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/* If `length' attribute, write additional function definitions and define
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variables used by `insn_current_length'. */
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if (! strcmp (XSTR (attr, 0), "length"))
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{
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puts ("\
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extern void shorten_branches (rtx);\n\
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extern int insn_default_length (rtx);\n\
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extern int insn_min_length (rtx);\n\
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extern int insn_variable_length_p (rtx);\n\
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extern int insn_current_length (rtx);\n\n\
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#include \"insn-addr.h\"\n");
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}
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}
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int
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main (int argc, char **argv)
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{
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rtx desc;
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int have_delay = 0;
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int have_annul_true = 0;
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int have_annul_false = 0;
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int num_insn_reservations = 0;
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int i;
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progname = "genattr";
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if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
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return (FATAL_EXIT_CODE);
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puts ("/* Generated automatically by the program `genattr'");
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puts (" from the machine description file `md'. */\n");
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puts ("#ifndef GCC_INSN_ATTR_H");
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puts ("#define GCC_INSN_ATTR_H\n");
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/* For compatibility, define the attribute `alternative', which is just
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a reference to the variable `which_alternative'. */
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puts ("#define HAVE_ATTR_alternative");
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puts ("#define get_attr_alternative(insn) which_alternative");
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/* Read the machine description. */
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while (1)
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{
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int line_no, insn_code_number;
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desc = read_md_rtx (&line_no, &insn_code_number);
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if (desc == NULL)
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break;
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if (GET_CODE (desc) == DEFINE_ATTR)
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gen_attr (desc);
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else if (GET_CODE (desc) == DEFINE_DELAY)
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{
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if (! have_delay)
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{
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printf ("#define DELAY_SLOTS\n");
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printf ("extern int num_delay_slots (rtx);\n");
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printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n");
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printf ("extern int const_num_delay_slots (rtx);\n\n");
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have_delay = 1;
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}
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for (i = 0; i < XVECLEN (desc, 1); i += 3)
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{
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if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
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{
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printf ("#define ANNUL_IFTRUE_SLOTS\n");
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printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n");
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have_annul_true = 1;
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}
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if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
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{
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printf ("#define ANNUL_IFFALSE_SLOTS\n");
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printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n");
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have_annul_false = 1;
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}
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}
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}
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else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
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num_insn_reservations++;
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}
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if (num_insn_reservations > 0)
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{
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/* Output interface for pipeline hazards recognition based on
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DFA (deterministic finite state automata. */
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printf ("\n#define INSN_SCHEDULING\n");
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printf ("\n/* DFA based pipeline interface. */");
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printf ("\n#ifndef AUTOMATON_ALTS\n");
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printf ("#define AUTOMATON_ALTS 0\n");
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printf ("#endif\n\n");
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printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
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printf ("#define AUTOMATON_STATE_ALTS 0\n");
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printf ("#endif\n\n");
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printf ("#ifndef CPU_UNITS_QUERY\n");
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printf ("#define CPU_UNITS_QUERY 0\n");
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printf ("#endif\n\n");
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/* Interface itself: */
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printf ("/* Internal insn code number used by automata. */\n");
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printf ("extern int internal_dfa_insn_code (rtx);\n\n");
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printf ("/* Insn latency time defined in define_insn_reservation. */\n");
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printf ("extern int insn_default_latency (rtx);\n\n");
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printf ("/* Return nonzero if there is a bypass for given insn\n");
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printf (" which is a data producer. */\n");
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printf ("extern int bypass_p (rtx);\n\n");
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printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
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printf (" Use the function if bypass_p returns nonzero for\n");
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printf (" the 1st insn. */\n");
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printf ("extern int insn_latency (rtx, rtx);\n\n");
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printf ("\n#if AUTOMATON_ALTS\n");
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printf ("/* The following function returns number of alternative\n");
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printf (" reservations of given insn. It may be used for better\n");
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printf (" insns scheduling heuristics. */\n");
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printf ("extern int insn_alts (rtx);\n\n");
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printf ("#endif\n\n");
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printf ("/* Maximal possible number of insns waiting results being\n");
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printf (" produced by insns whose execution is not finished. */\n");
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printf ("extern const int max_insn_queue_index;\n\n");
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printf ("/* Pointer to data describing current state of DFA. */\n");
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printf ("typedef void *state_t;\n\n");
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printf ("/* Size of the data in bytes. */\n");
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printf ("extern int state_size (void);\n\n");
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printf ("/* Initiate given DFA state, i.e. Set up the state\n");
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printf (" as all functional units were not reserved. */\n");
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printf ("extern void state_reset (state_t);\n");
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printf ("/* The following function returns negative value if given\n");
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printf (" insn can be issued in processor state described by given\n");
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printf (" DFA state. In this case, the DFA state is changed to\n");
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printf (" reflect the current and future reservations by given\n");
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printf (" insn. Otherwise the function returns minimal time\n");
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printf (" delay to issue the insn. This delay may be zero\n");
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printf (" for superscalar or VLIW processors. If the second\n");
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printf (" parameter is NULL the function changes given DFA state\n");
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printf (" as new processor cycle started. */\n");
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printf ("extern int state_transition (state_t, rtx);\n");
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printf ("\n#if AUTOMATON_STATE_ALTS\n");
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printf ("/* The following function returns number of possible\n");
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printf (" alternative reservations of given insn in given\n");
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printf (" DFA state. It may be used for better insns scheduling\n");
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printf (" heuristics. By default the function is defined if\n");
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printf (" macro AUTOMATON_STATE_ALTS is defined because its\n");
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printf (" implementation may require much memory. */\n");
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printf ("extern int state_alts (state_t, rtx);\n");
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printf ("#endif\n\n");
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printf ("extern int min_issue_delay (state_t, rtx);\n");
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printf ("/* The following function returns nonzero if no one insn\n");
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printf (" can be issued in current DFA state. */\n");
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printf ("extern int state_dead_lock_p (state_t);\n");
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printf ("/* The function returns minimal delay of issue of the 2nd\n");
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printf (" insn after issuing the 1st insn in given DFA state.\n");
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printf (" The 1st insn should be issued in given state (i.e.\n");
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printf (" state_transition should return negative value for\n");
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printf (" the insn and the state). Data dependencies between\n");
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printf (" the insns are ignored by the function. */\n");
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printf
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("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n");
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printf ("/* The following function outputs reservations for given\n");
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printf (" insn as they are described in the corresponding\n");
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printf (" define_insn_reservation. */\n");
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printf ("extern void print_reservation (FILE *, rtx);\n");
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printf ("\n#if CPU_UNITS_QUERY\n");
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printf ("/* The following function returns code of functional unit\n");
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printf (" with given name (see define_cpu_unit). */\n");
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printf ("extern int get_cpu_unit_code (const char *);\n");
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printf ("/* The following function returns nonzero if functional\n");
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printf (" unit with given code is currently reserved in given\n");
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printf (" DFA state. */\n");
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printf ("extern int cpu_unit_reservation_p (state_t, int);\n");
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printf ("#endif\n\n");
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printf ("/* Clean insn code cache. It should be called if there\n");
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printf (" is a chance that condition value in a\n");
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printf (" define_insn_reservation will be changed after\n");
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printf (" last call of dfa_start. */\n");
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printf ("extern void dfa_clean_insn_cache (void);\n\n");
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printf ("extern void dfa_clear_single_insn_cache (rtx);\n\n");
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printf ("/* Initiate and finish work with DFA. They should be\n");
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printf (" called as the first and the last interface\n");
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printf (" functions. */\n");
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printf ("extern void dfa_start (void);\n");
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printf ("extern void dfa_finish (void);\n");
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}
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else
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{
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/* Otherwise we do no scheduling, but we need these typedefs
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in order to avoid uglifying other code with more ifdefs. */
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printf ("typedef void *state_t;\n\n");
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}
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/* Output flag masks for use by reorg.
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Flags are used to hold branch direction and prediction information
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for use by eligible_for_... */
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printf("\n#define ATTR_FLAG_forward\t0x1\n");
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printf("#define ATTR_FLAG_backward\t0x2\n");
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printf("#define ATTR_FLAG_likely\t0x4\n");
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printf("#define ATTR_FLAG_very_likely\t0x8\n");
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printf("#define ATTR_FLAG_unlikely\t0x10\n");
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printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
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puts("\n#endif /* GCC_INSN_ATTR_H */");
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if (ferror (stdout) || fflush (stdout) || fclose (stdout))
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return FATAL_EXIT_CODE;
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return SUCCESS_EXIT_CODE;
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}
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