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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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a4cd5630b0
non-i386, non-unix, and generatable files have been trimmed, but can easily be added in later if needed. gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's handy to have both available for reference for such little cost. The freebsd-specific changes will then be committed, and once the dust has settled, the bmakefiles will be committed to use this code.
433 lines
12 KiB
C
433 lines
12 KiB
C
/* Generate attribute information (insn-attr.h) from machine description.
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Copyright (C) 1991, 1994 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 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, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include "hconfig.h"
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#include "rtl.h"
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#include "obstack.h"
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static struct obstack obstack;
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struct obstack *rtl_obstack = &obstack;
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#define obstack_chunk_alloc xmalloc
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#define obstack_chunk_free free
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extern void free PROTO((void *));
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extern rtx read_rtx PROTO((FILE *));
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char *xmalloc PROTO((unsigned));
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static void fatal ();
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void fancy_abort PROTO((void));
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/* A range of values. */
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struct range
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{
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int min;
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int max;
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};
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/* Record information about each function unit mentioned in a
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DEFINE_FUNCTION_UNIT. */
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struct function_unit
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{
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char *name; /* Function unit name. */
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struct function_unit *next; /* Next function unit. */
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int multiplicity; /* Number of units of this type. */
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int simultaneity; /* Maximum number of simultaneous insns
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on this function unit or 0 if unlimited. */
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struct range ready_cost; /* Range of ready cost values. */
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struct range issue_delay; /* Range of issue delay values. */
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};
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static void
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extend_range (range, min, max)
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struct range *range;
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int min;
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int max;
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{
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if (range->min > min) range->min = min;
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if (range->max < max) range->max = max;
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}
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static void
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init_range (range)
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struct range *range;
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{
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range->min = 100000;
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range->max = -1;
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}
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static void
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write_upcase (str)
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char *str;
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{
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for (; *str; str++)
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if (*str >= 'a' && *str <= 'z')
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printf ("%c", *str - 'a' + 'A');
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else
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printf ("%c", *str);
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}
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static void
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gen_attr (attr)
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rtx attr;
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{
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char *p;
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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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if (*XSTR (attr, 1) == '\0')
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printf ("extern int get_attr_%s ();\n", XSTR (attr, 0));
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else
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{
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printf ("enum attr_%s {", XSTR (attr, 0));
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write_upcase (XSTR (attr, 0));
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printf ("_");
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for (p = XSTR (attr, 1); *p != '\0'; p++)
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{
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if (*p == ',')
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{
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printf (", ");
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write_upcase (XSTR (attr, 0));
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printf ("_");
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}
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else if (*p >= 'a' && *p <= 'z')
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printf ("%c", *p - 'a' + 'A');
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else
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printf ("%c", *p);
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}
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printf ("};\n");
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printf ("extern enum attr_%s get_attr_%s ();\n\n",
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XSTR (attr, 0), XSTR (attr, 0));
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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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printf ("extern void init_lengths ();\n");
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printf ("extern void shorten_branches PROTO((rtx));\n");
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printf ("extern int insn_default_length PROTO((rtx));\n");
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printf ("extern int insn_variable_length_p PROTO((rtx));\n");
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printf ("extern int insn_current_length PROTO((rtx));\n\n");
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printf ("extern int *insn_addresses;\n");
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printf ("extern int insn_current_address;\n\n");
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}
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}
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static void
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write_units (num_units, multiplicity, simultaneity,
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ready_cost, issue_delay, blockage)
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int num_units;
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struct range *multiplicity;
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struct range *simultaneity;
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struct range *ready_cost;
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struct range *issue_delay;
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struct range *blockage;
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{
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int i, q_size;
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printf ("#define INSN_SCHEDULING\n\n");
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printf ("extern int result_ready_cost PROTO((rtx));\n");
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printf ("extern int function_units_used PROTO((rtx));\n\n");
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printf ("extern struct function_unit_desc\n");
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printf ("{\n");
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printf (" char *name;\n");
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printf (" int bitmask;\n");
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printf (" int multiplicity;\n");
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printf (" int simultaneity;\n");
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printf (" int default_cost;\n");
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printf (" int max_issue_delay;\n");
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printf (" int (*ready_cost_function) ();\n");
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printf (" int (*conflict_cost_function) ();\n");
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printf (" int max_blockage;\n");
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printf (" unsigned int (*blockage_range_function) ();\n");
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printf (" int (*blockage_function) ();\n");
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printf ("} function_units[];\n\n");
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printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units);
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printf ("#define MIN_MULTIPLICITY %d\n", multiplicity->min);
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printf ("#define MAX_MULTIPLICITY %d\n", multiplicity->max);
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printf ("#define MIN_SIMULTANEITY %d\n", simultaneity->min);
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printf ("#define MAX_SIMULTANEITY %d\n", simultaneity->max);
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printf ("#define MIN_READY_COST %d\n", ready_cost->min);
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printf ("#define MAX_READY_COST %d\n", ready_cost->max);
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printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay->min);
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printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay->max);
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printf ("#define MIN_BLOCKAGE %d\n", blockage->min);
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printf ("#define MAX_BLOCKAGE %d\n", blockage->max);
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for (i = 0; (1 << i) < blockage->max; i++)
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;
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printf ("#define BLOCKAGE_BITS %d\n", i + 1);
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/* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
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MAX_READY_COST. This is the longest time an isnsn may be queued. */
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i = MAX (blockage->max, ready_cost->max);
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for (q_size = 1; q_size <= i; q_size <<= 1)
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;
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printf ("#define INSN_QUEUE_SIZE %d\n", q_size);
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}
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char *
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xmalloc (size)
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unsigned size;
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{
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register char *val = (char *) malloc (size);
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if (val == 0)
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fatal ("virtual memory exhausted");
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return val;
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}
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char *
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xrealloc (ptr, size)
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char *ptr;
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unsigned size;
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{
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char * result = (char *) realloc (ptr, size);
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if (!result)
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fatal ("virtual memory exhausted");
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return result;
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}
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static void
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fatal (s, a1, a2)
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char *s;
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{
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fprintf (stderr, "genattr: ");
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fprintf (stderr, s, a1, a2);
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fprintf (stderr, "\n");
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exit (FATAL_EXIT_CODE);
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}
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/* More 'friendly' abort that prints the line and file.
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config.h can #define abort fancy_abort if you like that sort of thing. */
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void
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fancy_abort ()
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{
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fatal ("Internal gcc abort.");
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}
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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rtx desc;
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FILE *infile;
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register int c;
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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_units = 0;
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struct range all_simultaneity, all_multiplicity;
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struct range all_ready_cost, all_issue_delay, all_blockage;
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struct function_unit *units = 0, *unit;
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int i;
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init_range (&all_multiplicity);
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init_range (&all_simultaneity);
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init_range (&all_ready_cost);
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init_range (&all_issue_delay);
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init_range (&all_blockage);
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obstack_init (rtl_obstack);
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if (argc <= 1)
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fatal ("No input file name.");
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infile = fopen (argv[1], "r");
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if (infile == 0)
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{
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perror (argv[1]);
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exit (FATAL_EXIT_CODE);
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}
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init_rtl ();
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printf ("/* Generated automatically by the program `genattr'\n\
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from the machine description file `md'. */\n\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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printf("#ifndef PROTO\n");
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printf("#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)\n");
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printf("#define PROTO(ARGS) ARGS\n");
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printf("#else\n");
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printf("#define PROTO(ARGS) ()\n");
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printf("#endif\n");
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printf("#endif\n");
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printf ("#define HAVE_ATTR_alternative\n");
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printf ("#define get_attr_alternative(insn) which_alternative\n");
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/* Read the machine description. */
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while (1)
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{
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c = read_skip_spaces (infile);
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if (c == EOF)
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break;
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ungetc (c, infile);
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desc = read_rtx (infile);
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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 PROTO((rtx));\n");
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printf ("extern int eligible_for_delay PROTO((rtx, int, rtx, int));\n\n");
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printf ("extern int const_num_delay_slots PROTO((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 ();\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 ();\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_FUNCTION_UNIT)
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{
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char *name = XSTR (desc, 0);
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int multiplicity = XINT (desc, 1);
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int simultaneity = XINT (desc, 2);
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int ready_cost = MAX (XINT (desc, 4), 1);
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int issue_delay = MAX (XINT (desc, 5), 1);
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int issueexp_p = (XVEC (desc, 6) != 0);
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for (unit = units; unit; unit = unit->next)
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if (strcmp (unit->name, name) == 0)
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break;
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if (unit == 0)
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{
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int len = strlen (name) + 1;
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unit = (struct function_unit *)
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alloca (sizeof (struct function_unit));
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unit->name = (char *) alloca (len);
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bcopy (name, unit->name, len);
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unit->multiplicity = multiplicity;
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unit->simultaneity = simultaneity;
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unit->ready_cost.min = unit->ready_cost.max = ready_cost;
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unit->issue_delay.min = unit->issue_delay.max = issue_delay;
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unit->next = units;
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units = unit;
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num_units++;
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extend_range (&all_multiplicity, multiplicity, multiplicity);
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extend_range (&all_simultaneity, simultaneity, simultaneity);
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}
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else if (unit->multiplicity != multiplicity
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|| unit->simultaneity != simultaneity)
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fatal ("Differing specifications given for `%s' function unit.",
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unit->name);
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extend_range (&unit->ready_cost, ready_cost, ready_cost);
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extend_range (&unit->issue_delay,
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issueexp_p ? 1 : issue_delay, issue_delay);
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extend_range (&all_ready_cost,
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unit->ready_cost.min, unit->ready_cost.max);
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extend_range (&all_issue_delay,
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unit->issue_delay.min, unit->issue_delay.max);
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}
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}
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if (num_units > 0)
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{
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/* Compute the range of blockage cost values. See genattrtab.c
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for the derivation. BLOCKAGE (E,C) when SIMULTANEITY is zero is
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MAX (ISSUE-DELAY (E,C),
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READY-COST (E) - (READY-COST (C) - 1))
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and otherwise
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MAX (ISSUE-DELAY (E,C),
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READY-COST (E) - (READY-COST (C) - 1),
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READY-COST (E) - FILL-TIME) */
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for (unit = units; unit; unit = unit->next)
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{
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struct range blockage;
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blockage = unit->issue_delay;
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blockage.max = MAX (unit->ready_cost.max
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- (unit->ready_cost.min - 1),
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blockage.max);
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blockage.min = MAX (1, blockage.min);
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if (unit->simultaneity != 0)
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{
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int fill_time = ((unit->simultaneity - 1)
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* unit->issue_delay.min);
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blockage.min = MAX (unit->ready_cost.min - fill_time,
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blockage.min);
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blockage.max = MAX (unit->ready_cost.max - fill_time,
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blockage.max);
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}
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extend_range (&all_blockage, blockage.min, blockage.max);
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}
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write_units (num_units, &all_multiplicity, &all_simultaneity,
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&all_ready_cost, &all_issue_delay, &all_blockage);
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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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fflush (stdout);
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exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
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/* NOTREACHED */
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return 0;
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}
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