1 /* Read machine descriptions, return top level rtx for use by the
2 various generation passes.
4 Copyright (C) 2000 Free Software Foundation, Inc.
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
27 #include "gensupport.h"
29 static FILE *input_file;
31 static int sequence_num;
35 struct queue_elem *next;
38 static struct queue_elem *rtx_ready_queue;
40 /* Recursively remove constraints from an rtx. */
43 remove_constraints (part)
47 register const char *format_ptr;
52 if (GET_CODE (part) == MATCH_OPERAND)
54 else if (GET_CODE (part) == MATCH_SCRATCH)
57 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
59 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
60 switch (*format_ptr++)
64 remove_constraints (XEXP (part, i));
67 if (XVEC (part, i) != NULL)
68 for (j = 0; j < XVECLEN (part, i); j++)
69 remove_constraints (XVECEXP (part, i, j));
74 /* Handle any synthetic top level rtx, i.e. anything except:
82 DEFINE_ASM_ATTRIBUTES */
88 if (GET_CODE (*desc) == DEFINE_INSN_AND_SPLIT)
90 struct queue_elem* elem = xmalloc (sizeof (struct queue_elem));
91 const char *split_cond;
93 /* Create a split with values from the insn_and_split. */
94 rtx split = rtx_alloc (DEFINE_SPLIT);
95 XEXP (split, 0) = copy_rtx (XEXP (*desc, 1));
96 remove_constraints (XEXP (split, 0));
97 split_cond = XSTR (split, 1) = XSTR (*desc, 4);
99 /* If the split condition starts with "&&", append it to the
100 insn condition to create the new split condition. */
101 if (split_cond[0] == '&' && split_cond[1] == '&')
103 const char *insn_cond = XSTR (*desc, 2);
105 xmalloc (strlen (insn_cond) + strlen (split_cond) + 1);
106 strcpy (combined, insn_cond);
107 strcat (combined, split_cond);
108 XSTR (split, 1) = combined;
111 XVEC (split, 2) = XVEC (*desc, 5);
112 XSTR (split, 3) = XSTR (*desc, 6);
114 /* Fix up the DEFINE_INSN. */
115 PUT_CODE (*desc, DEFINE_INSN);
116 XVEC (*desc, 4) = XVEC (*desc, 7);
118 /* Return the DEFINE_INSN part, and put the DEFINE_SPLIT
120 elem->next = rtx_ready_queue;
122 rtx_ready_queue = elem;
126 /* The entry point for initializing the reader. */
129 init_md_reader (filename)
130 const char *filename;
133 input_file = fopen (filename, "r");
138 return FATAL_EXIT_CODE;
141 read_rtx_filename = filename;
143 rtx_ready_queue = NULL;
145 return SUCCESS_EXIT_CODE;
149 /* The entry point for reading a single rtx from an md file. */
152 read_md_rtx (lineno, seqnr)
158 if (rtx_ready_queue != NULL)
160 desc = rtx_ready_queue->data;
161 rtx_ready_queue = rtx_ready_queue->next;
166 c = read_skip_spaces (input_file);
170 ungetc (c, input_file);
171 desc = read_rtx (input_file);
174 *lineno = read_rtx_lineno;
175 *seqnr = sequence_num;
176 switch (GET_CODE (desc))
181 case DEFINE_PEEPHOLE:
182 case DEFINE_PEEPHOLE2: