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freebsd/contrib/gcc/genattr.c
Alexander Kabaev 6b834ef156 GCC 4.2.0 release.
2007-05-19 01:19:51 +00:00

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