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genoutput.c
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C/C++ Source or Header
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1994-02-06
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27KB
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991 lines
/* Generate code from to output assembler insns as recognized from rtl.
Copyright (C) 1987, 1988, 1992 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC 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.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* This program reads the machine description for the compiler target machine
and produces a file containing these things:
1. An array of strings `insn_template' which is indexed by insn code number
and contains the template for output of that insn,
2. An array of functions `insn_outfun' which, indexed by the insn code
number, gives the function that returns a template to use for output of
that insn. This is used only in the cases where the template is not
constant. These cases are specified by a * or @ at the beginning of the
template string in the machine description. They are identified for the
sake of other parts of the compiler by a zero element in `insn_template'.
3. An array of functions `insn_gen_function' which, indexed
by insn code number, gives the function to generate a body
for that pattern, given operands as arguments.
4. An array of strings `insn_name' which, indexed by insn code number,
gives the name for that pattern. Nameless patterns are given a name.
5. An array of ints `insn_n_operands' which is indexed by insn code number
and contains the number of distinct operands in the pattern for that insn,
6. An array of ints `insn_n_dups' which is indexed by insn code number
and contains the number of match_dup's that appear in the insn's pattern.
This says how many elements of `recog_dup_loc' are significant
after an insn has been recognized.
7. An array of arrays of operand constraint strings,
`insn_operand_constraint',
indexed first by insn code number and second by operand number,
containing the constraint for that operand.
This array is generated only if register constraints appear in
match_operand rtx's.
8. An array of arrays of chars which indicate which operands of
which insn patterns appear within ADDRESS rtx's. This array is
called `insn_operand_address_p' and is generated only if there
are *no* register constraints in the match_operand rtx's.
9. An array of arrays of machine modes, `insn_operand_mode',
indexed first by insn code number and second by operand number,
containing the machine mode that that operand is supposed to have.
Also `insn_operand_strict_low', which is nonzero for operands
contained in a STRICT_LOW_PART.
10. An array of arrays of int-valued functions, `insn_operand_predicate',
indexed first by insn code number and second by operand number,
containing the match_operand predicate for this operand.
11. An array of ints, `insn_n_alternatives', that gives the number
of alternatives in the constraints of each pattern.
The code number of an insn is simply its position in the machine description;
code numbers are assigned sequentially to entries in the description,
starting with code number 0.
Thus, the following entry in the machine description
(define_insn "clrdf"
[(set (match_operand:DF 0 "general_operand" "")
(const_int 0))]
""
"clrd %0")
assuming it is the 25th entry present, would cause
insn_template[24] to be "clrd %0", and insn_n_operands[24] to be 1.
It would not make an case in output_insn_hairy because the template
given in the entry is a constant (it does not start with `*'). */
#include <stdio.h>
#include "hconfig.h"
#include "rtl.h"
#include "obstack.h"
/* No instruction can have more operands than this.
Sorry for this arbitrary limit, but what machine will
have an instruction with this many operands? */
#define MAX_MAX_OPERANDS 40
static struct obstack obstack;
struct obstack *rtl_obstack = &obstack;
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
extern void free ();
extern rtx read_rtx ();
char *xmalloc ();
static void fatal ();
void fancy_abort ();
static void error ();
static void mybcopy ();
static void mybzero ();
static int n_occurrences ();
/* insns in the machine description are assigned sequential code numbers
that are used by insn-recog.c (produced by genrecog) to communicate
to insn-output.c (produced by this program). */
static int next_code_number;
/* This counts all definitions in the md file,
for the sake of error messages. */
static int next_index_number;
/* Record in this chain all information that we will output,
associated with the code number of the insn. */
struct data
{
int code_number;
int index_number;
char *name;
char *template; /* string such as "movl %1,%0" */
int n_operands; /* Number of operands this insn recognizes */
int n_dups; /* Number times match_dup appears in pattern */
int n_alternatives; /* Number of alternatives in each constraint */
struct data *next;
char *constraints[MAX_MAX_OPERANDS];
/* Number of alternatives in constraints of operand N. */
int op_n_alternatives[MAX_MAX_OPERANDS];
char *predicates[MAX_MAX_OPERANDS];
char address_p[MAX_MAX_OPERANDS];
enum machine_mode modes[MAX_MAX_OPERANDS];
char strict_low[MAX_MAX_OPERANDS];
char outfun; /* Nonzero means this has an output function */
};
/* This variable points to the first link in the chain. */
struct data *insn_data;
/* Pointer to the last link in the chain, so new elements
can be added at the end. */
struct data *end_of_insn_data;
/* Nonzero if any match_operand has a constraint string;
implies that REGISTER_CONSTRAINTS will be defined
for this machine description. */
int have_constraints;
static void
output_prologue ()
{
printf ("/* Generated automatically by the program `genoutput'\n\
from the machine description file `md'. */\n\n");
printf ("#include \"config.h\"\n");
printf ("#include \"rtl.h\"\n");
printf ("#include \"regs.h\"\n");
printf ("#include \"hard-reg-set.h\"\n");
printf ("#include \"real.h\"\n");
printf ("#include \"insn-config.h\"\n\n");
printf ("#include \"conditions.h\"\n");
printf ("#include \"insn-flags.h\"\n");
printf ("#include \"insn-attr.h\"\n\n");
printf ("#include \"insn-codes.h\"\n\n");
printf ("#include \"recog.h\"\n\n");
printf ("#include <stdio.h>\n");
printf ("#include \"output.h\"\n");
}
static void
output_epilogue ()
{
register struct data *d;
printf ("\nchar * const insn_template[] =\n {\n");
for (d = insn_data; d; d = d->next)
{
if (d->template)
printf (" \"%s\",\n", d->template);
else
printf (" 0,\n");
}
printf (" };\n");
printf ("\nchar *(*const insn_outfun[])() =\n {\n");
for (d = insn_data; d; d = d->next)
{
if (d->outfun)
printf (" output_%d,\n", d->code_number);
else
printf (" 0,\n");
}
printf (" };\n");
printf ("\nrtx (*const insn_gen_function[]) () =\n {\n");
for (d = insn_data; d; d = d->next)
{
if (d->name)
printf (" gen_%s,\n", d->name);
else
printf (" 0,\n");
}
printf (" };\n");
printf ("\nchar *insn_name[] =\n {\n");
{
int offset = 0;
int next;
char * last_name = 0;
char * next_name;
register struct data *n;
for (n = insn_data, next = 0; n; n = n->next, next++)
if (n->name)
{
next_name = n->name;
break;
}
for (d = insn_data; d; d = d->next)
{
if (d->name)
{
printf (" \"%s\",\n", d->name);
offset = 0;
last_name = d->name;
next_name = 0;
for (n = d->next, next = 1; n; n = n->next, next++)
if (n->name)
{
next_name = n-