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- /* 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);
- }
-