sim/igen/table.h

   1 /* The IGEN simulator generator for GDB, the GNU Debugger.
   2
   3    Copyright 2002-2019 Free Software Foundation, Inc.
   4
   5    Contributed by Andrew Cagney.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22
  23 /* Read a table, line by line, from a file.
  24
  25    A table line has several forms:
  26
  27    Field line:
  28
  29        <text> { ":" <text> }
  30        type == table_colon_entry
  31
  32        Fields points to a NULL terminated list of pointers.
  33
  34    Tab indented block:
  35
  36      <tab> <text> <nl> { <tab> <text> <nl> }
  37      type == table_code_entry
  38
  39      The leading tab at the start of each line is discarded.
  40      fields[i] is the i'th line with the <nl> discarded.
  41
  42
  43    Code block:
  44
  45      "{" <ignore-text> <nl> { <text> <nl> } "}" <ignore-text> <nl>
  46      type == table_code_entry
  47
  48      The leading/trailing {/} lines are discarded.
  49      Lines containing two leading spaces have those spaces striped.
  50      fields[i] is the i'th line with the <nl> discarded.
  51
  52    In addition, the table parser reconises and handles internally the
  53    following (when not in a code block):
  54
  55      "#" <line-nr> '"' <file> '"'
  56
  57      As per CPP/CC, treat following lines as if they were taken from
  58      <file> starting at <line-nr>
  59
  60    No support for CPP's "#if/#else/#endif" style conditions are
  61    planned. */
  62
  63 typedef struct _table table;
  64
  65 typedef enum
  66 {
  67   table_colon_entry,
  68   table_code_entry,
  69 }
  70 table_entry_type;
  71
  72
  73 typedef struct _table_entry table_entry;
  74 struct _table_entry
  75 {
  76   table *file;
  77   line_ref *line;
  78   table_entry_type type;
  79   int nr_fields;
  80   char **field;
  81 };
  82
  83 /* List of directories to search when opening a pushed file.  Current
  84    directory is always searched first */
  85 typedef struct _table_include table_include;
  86 struct _table_include
  87 {
  88   char *dir;
  89   table_include *next;
  90 };
  91
  92
  93 /* Open/read a table file.  Since the file is read once during open
  94    (and then closed immediately) there is no close method. */
  95
  96 extern table *table_open (const char *file_name);
  97
  98 extern table_entry *table_read (table *file);
  99
 100
 101 /* Push the the state of the current file and open FILE_NAME.  When
 102    the end of FILE_NAME is reached, return to the pushed file */
 103
 104 extern void table_push
 105   (table *file, line_ref *line, table_include *search, const char *file_name);
 106
 107
 108 /* Expand the specified field_nr using the internal expansion table.
 109    A field is only expanded when explicitly specified.  */
 110
 111 extern void table_expand_field (table_entry *entry, int field_nr);
 112
 113
 114 /* Given a code entry, write the code to FILE.  Since any
 115    leading/trailing braces were striped as part of the read, they are
 116    not written. */
 117
 118 extern void table_print_code (lf *file, table_entry *entry);
 119
 120
 121 /* Debugging */
 122
 123 extern void dump_line_ref
 124   (lf *file, char *prefix, const line_ref *line, char *suffix);
 125
 126 extern void dump_table_entry
 127   (lf *file, char *prefix, const table_entry *entry, char *suffix);
 128
 129
 130
 131 /* Utilities for skipping around text */
 132
 133 extern char *skip_digits (char *chp);
 134
 135 extern char *skip_spaces (char *chp);
 136
 137 extern char *skip_to_separator (char *chp, char *separators);
 138
 139 extern char *back_spaces (char *start, char *chp);