This is genemit.c in view mode; [Download] [Up]
/* Generate code from machine description to emit insns as rtl.
Copyright (C) 1987, 1988 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 1, 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. */
#include <stdio.h>
#include "config.h"
#include "rtl.h"
#include "obstack.h"
struct obstack obstack;
struct obstack *rtl_obstack = &obstack;
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
extern int xmalloc ();
extern void free ();
void fatal ();
void fancy_abort ();
int max_opno;
int max_dup_opno;
int register_constraints;
int insn_code_number;
#define max(a, b) ((a) > (b) ? (a) : (b))
void
max_operand_1 (x)
rtx x;
{
register RTX_CODE code;
register int i;
register int len;
register char *fmt;
if (x == 0)
return;
code = GET_CODE (x);
if (code == MATCH_OPERAND && XSTR (x, 2) != 0)
register_constraints = 1;
if (code == MATCH_OPERAND || code == MATCH_OPERATOR)
max_opno = max (max_opno, XINT (x, 0));
if (code == MATCH_DUP)
max_dup_opno = max (max_dup_opno, XINT (x, 0));
fmt = GET_RTX_FORMAT (code);
len = GET_RTX_LENGTH (code);
for (i = 0; i < len; i++)
{
if (fmt[i] == 'e' || fmt[i] == 'u')
max_operand_1 (XEXP (x, i));
else if (fmt[i] == 'E')
{
int j;
for (j = 0; j < XVECLEN (x, i); j++)
max_operand_1 (XVECEXP (x, i, j));
}
}
}
int
max_operand_vec (insn, arg)
rtx insn;
int arg;
{
register int len = XVECLEN (insn, arg);
register int i;
max_opno = -1;
max_dup_opno = -1;
for (i = 0; i < len; i++)
max_operand_1 (XVECEXP (insn, arg, i));
return max_opno + 1;
}
void
print_code (code)
RTX_CODE code;
{
register char *p1;
for (p1 = GET_RTX_NAME (code); *p1; p1++)
{
if (*p1 >= 'a' && *p1 <= 'z')
putchar (*p1 + 'A' - 'a');
else
putchar (*p1);
}
}
/* Print a C expression to construct an RTX just like X,
substituting any operand references appearing within. */
void
gen_exp (x)
rtx x;
{
register RTX_CODE code;
register int i;
register int len;
register char *fmt;
if (x == 0)
{
printf ("0");
return;
}
code = GET_CODE (x);
switch (code)
{
case MATCH_OPERAND:
case MATCH_DUP:
printf ("operand%d", XINT (x, 0));
return;
case MATCH_OPERATOR:
printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
for (i = 0; i < XVECLEN (x, 2); i++)
{
printf (",\n\t\t");
gen_exp (XVECEXP (x, 2, i));
}
printf (")");
return;
case ADDRESS:
fatal ("ADDRESS expression code used in named instruction pattern");
case PC:
printf ("pc_rtx");
return;
case CC0:
printf ("cc0_rtx");
return;
case CONST_INT:
if (INTVAL (x) == 0)
{
printf ("const0_rtx");
return;
}
if (INTVAL (x) == 1)
{
printf ("const1_rtx");
return;
}
}
printf ("gen_rtx (");
print_code (code);
printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
fmt = GET_RTX_FORMAT (code);
len = GET_RTX_LENGTH (code);
for (i = 0; i < len; i++)
{
if (fmt[i] == '0')
break;
printf (", ");
if (fmt[i] == 'e' || fmt[i] == 'u')
gen_exp (XEXP (x, i));
else if (fmt[i] == 'i')
printf ("%d", XINT (x, i));
else if (fmt[i] == 's')
printf ("\"%s\"", XSTR (x, i));
else if (fmt[i] == 'E')
{
int j;
printf ("gen_rtvec (%d", XVECLEN (x, i));
for (j = 0; j < XVECLEN (x, i); j++)
{
printf (",\n\t\t");
gen_exp (XVECEXP (x, i, j));
}
printf (")");
}
else
abort ();
}
printf (")");
}
/* Generate the `gen_...' function for a DEFINE_INSN. */
void
gen_insn (insn)
rtx insn;
{
int operands;
register int i;
/* Don't mention instructions whose names are the null string.
They are in the machine description just to be recognized. */
if (strlen (XSTR (insn, 0)) == 0)
return;
/* Find out how many operands this function has,
and also whether any of them have register constraints. */
register_constraints = 0;
operands = max_operand_vec (insn, 1);
if (max_dup_opno >= operands)
fatal ("match_dup operand number has no match_operand");
/* Output the function name and argument declarations. */
printf ("rtx\ngen_%s (", XSTR (insn, 0));
for (i = 0; i < operands; i++)
printf (i ? ", operand%d" : "operand%d", i);
printf (")\n");
for (i = 0; i < operands; i++)
printf (" rtx operand%d;\n", i);
printf ("{\n");
/* Output code to construct and return the rtl for the instruction body */
if (XVECLEN (insn, 1) == 1)
{
printf (" return ");
gen_exp (XVECEXP (insn, 1, 0));
printf (";\n}\n\n");
}
else
{
printf (" return gen_rtx (PARALLEL, VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
for (i = 0; i < XVECLEN (insn, 1); i++)
{
printf (",\n\t\t");
gen_exp (XVECEXP (insn, 1, i));
}
printf ("));\n}\n\n");
}
}
/* Generate the `gen_...' function for a DEFINE_EXPAND. */
void
gen_expand (expand)
rtx expand;
{
int operands;
register int i;
if (strlen (XSTR (expand, 0)) == 0)
fatal ("define_expand lacks a name");
if (XVEC (expand, 1) == 0)
fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
/* Find out how many operands this function has,
and also whether any of them have register constraints. */
register_constraints = 0;
operands = max_operand_vec (expand, 1);
/* Output the function name and argument declarations. */
printf ("rtx\ngen_%s (", XSTR (expand, 0));
for (i = 0; i < operands; i++)
printf (i ? ", operand%d" : "operand%d", i);
printf (")\n");
for (i = 0; i < operands; i++)
printf (" rtx operand%d;\n", i);
printf ("{\n");
/* For each operand referred to only with MATCH_DUPs,
make a local variable. */
for (i = operands; i <= max_dup_opno; i++)
printf (" rtx operand%d;\n", i);
printf (" rtx operands[%d];\n", max (operands, max_dup_opno + 1));
printf (" rtx _val;\n");
printf (" start_sequence ();\n");
/* The fourth operand of DEFINE_EXPAND is some code to be executed
before the actual construction.
This code expects to refer to `operands'
just as the output-code in a DEFINE_INSN does,
but here `operands' is an automatic array.
So copy the operand values there before executing it. */
if (XSTR (expand, 3))
{
/* Output code to copy the arguments into `operands'. */
for (i = 0; i < operands; i++)
printf (" operands[%d] = operand%d;\n", i, i);
/* Output the special code to be executed before the sequence
is generated. */
printf ("%s\n", XSTR (expand, 3));
/* Output code to copy the arguments back out of `operands'
(unless we aren't going to use them at all). */
if (XVEC (expand, 1) != 0)
{
for (i = 0; i < operands; i++)
printf (" operand%d = operands[%d];\n", i, i);
for (; i <= max_dup_opno; i++)
printf (" operand%d = operands[%d];\n", i, i);
}
}
/* Output code to construct the rtl for the instruction bodies.
Use emit_insn to add them to the sequence being accumulated.
But don't do this if the user's code has set `no_more' nonzero. */
for (i = 0; i < XVECLEN (expand, 1); i++)
{
rtx next = XVECEXP (expand, 1, i);
if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
|| (GET_CODE (next) == PARALLEL
&& GET_CODE (XVECEXP (next, 0, 0)) == SET
&& GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
|| GET_CODE (next) == RETURN)
printf (" emit_jump_insn (");
else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
|| GET_CODE (next) == CALL
|| (GET_CODE (next) == PARALLEL
&& GET_CODE (XVECEXP (next, 0, 0)) == SET
&& GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
|| (GET_CODE (next) == PARALLEL
&& GET_CODE (XVECEXP (next, 0, 0)) == CALL))
printf (" emit_call_insn (");
else if (GET_CODE (next) == CODE_LABEL)
printf (" emit_label (");
else if (GET_CODE (next) == MATCH_OPERAND
|| GET_CODE (next) == MATCH_OPERATOR
|| GET_CODE (next) == MATCH_DUP
|| GET_CODE (next) == PARALLEL)
printf (" emit (");
else
printf (" emit_insn (");
gen_exp (next);
printf (");\n");
if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
&& GET_CODE (SET_SRC (next)) == LABEL_REF)
printf (" emit_barrier ();");
}
/* Call `gen_sequence' to make a SEQUENCE out of all the
insns emitted within this gen_... function. */
printf (" _done:\n");
printf (" _val = gen_sequence ();\n");
printf (" end_sequence ();\n");
printf (" return _val;\n}\n\n");
}
int
xmalloc (size)
{
register int val = malloc (size);
if (val == 0)
fatal ("virtual memory exhausted");
return val;
}
int
xrealloc (ptr, size)
char *ptr;
int size;
{
int result = realloc (ptr, size);
if (!result)
fatal ("virtual memory exhausted");
return result;
}
void
fatal (s, a1, a2)
char *s;
{
fprintf (stderr, "genemit: ");
fprintf (stderr, s, a1, a2);
fprintf (stderr, "\n");
exit (FATAL_EXIT_CODE);
}
/* More 'friendly' abort that prints the line and file.
config.h can #define abort fancy_abort if you like that sort of thing. */
void
fancy_abort ()
{
fatal ("Internal gcc abort.");
}
int
main (argc, argv)
int argc;
char **argv;
{
rtx desc;
FILE *infile;
extern rtx read_rtx ();
register int c;
obstack_init (rtl_obstack);
if (argc <= 1)
fatal ("No input file name.");
infile = fopen (argv[1], "r");
if (infile == 0)
{
perror (argv[1]);
exit (FATAL_EXIT_CODE);
}
init_rtl ();
/* Assign sequential codes to all entries in the machine description
in parallel with the tables in insn-output.c. */
insn_code_number = 0;
printf ("/* Generated automatically by the program `genemit'\n\
from the machine description file `md'. */\n\n");
printf ("#include \"config.h\"\n");
printf ("#include \"rtl.h\"\n");
printf ("#include \"expr.h\"\n");
printf ("#include \"real.h\"\n");
printf ("#include \"insn-config.h\"\n\n");
printf ("#include \"insn-flags.h\"\n\n");
printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
printf ("extern rtx recog_operand[];\n");
printf ("#define operands emit_operand\n\n");
printf ("#define FAIL do { end_sequence (); return 0;} while (0)\n\n");
printf ("#define DONE goto _done\n\n");
/* Read the machine description. */
while (1)
{
c = read_skip_spaces (infile);
if (c == EOF)
break;
ungetc (c, infile);
desc = read_rtx (infile);
if (GET_CODE (desc) == DEFINE_INSN)
{
gen_insn (desc);
++insn_code_number;
}
if (GET_CODE (desc) == DEFINE_EXPAND)
{
gen_expand (desc);
++insn_code_number;
}
if (GET_CODE (desc) == DEFINE_PEEPHOLE)
{
++insn_code_number;
}
}
fflush (stdout);
exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.