gcc/config/c4x/c4x-c.c

   1 /* Subroutines for the C front end on the TMS320C[34]x
   2    Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
   3    2007 Free Software Foundation, Inc.
   4
   5    Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz)
   6               and Herman Ten Brugge (Haj.Ten.Brugge@net.HCC.nl).
   7
   8 This file is part of GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 3, or (at your option)
  13 any later version.
  14
  15 GCC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GCC; see the file COPYING3.  If not see
  22 <http://www.gnu.org/licenses/>.  */
  23
  24 #include "config.h"
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "tm.h"
  28 #include "tree.h"
  29 #include "toplev.h"
  30 #include "cpplib.h"
  31 #include "c-pragma.h"
  32 #include "tm_p.h"
  33
  34 static int c4x_parse_pragma (const char *, tree *, tree *);
  35
  36 /* Handle machine specific pragmas for compatibility with existing
  37    compilers for the C3x/C4x.
  38
  39    pragma                                  attribute
  40    ----------------------------------------------------------
  41    CODE_SECTION(symbol,"section")          section("section")
  42    DATA_SECTION(symbol,"section")          section("section")
  43    FUNC_CANNOT_INLINE(function)
  44    FUNC_EXT_CALLED(function)
  45    FUNC_IS_PURE(function)                  const
  46    FUNC_IS_SYSTEM(function)
  47    FUNC_NEVER_RETURNS(function)            noreturn
  48    FUNC_NO_GLOBAL_ASG(function)
  49    FUNC_NO_IND_ASG(function)
  50    INTERRUPT(function)                     interrupt
  51
  52    */
  53
  54 /* Parse a C4x pragma, of the form ( function [, "section"] ) \n.
  55    FUNC is loaded with the IDENTIFIER_NODE of the function, SECT with
  56    the STRING_CST node of the string.  If SECT is null, then this
  57    pragma doesn't take a section string.  Returns 0 for a good pragma,
  58    -1 for a malformed pragma.  */
  59 #define BAD(gmsgid, arg) \
  60   do { warning (OPT_Wpragmas, gmsgid, arg); return -1; } while (0)
  61
  62 static int
  63 c4x_parse_pragma (name, func, sect)
  64      const char *name;
  65      tree *func;
  66      tree *sect;
  67 {
  68   tree f, s, x;
  69
  70   if (pragma_lex (&x) != CPP_OPEN_PAREN)
  71     BAD ("missing '(' after '#pragma %s' - ignored", name);
  72
  73   if (pragma_lex (&f) != CPP_NAME)
  74     BAD ("missing function name in '#pragma %s' - ignored", name);
  75
  76   if (sect)
  77     {
  78       if (pragma_lex (&x) != CPP_COMMA)
  79         BAD ("malformed '#pragma %s' - ignored", name);
  80       if (pragma_lex (&s) != CPP_STRING)
  81         BAD ("missing section name in '#pragma %s' - ignored", name);
  82       *sect = s;
  83     }
  84
  85   if (pragma_lex (&x) != CPP_CLOSE_PAREN)
  86     BAD ("missing ')' for '#pragma %s' - ignored", name);
  87
  88   if (pragma_lex (&x) != CPP_EOF)
  89     warning (OPT_Wpragmas, "junk at end of '#pragma %s'", name);
  90
  91   *func = f;
  92   return 0;
  93 }
  94
  95 void
  96 c4x_pr_CODE_SECTION (pfile)
  97      cpp_reader *pfile ATTRIBUTE_UNUSED;
  98 {
  99   tree func, sect;
 100
 101   if (c4x_parse_pragma ("CODE_SECTION", &func, &sect))
 102     return;
 103   code_tree = chainon (code_tree,
 104                        build_tree_list (func,
 105                                         build_tree_list (NULL_TREE, sect)));
 106 }
 107
 108 void
 109 c4x_pr_DATA_SECTION (pfile)
 110      cpp_reader *pfile ATTRIBUTE_UNUSED;
 111 {
 112   tree func, sect;
 113
 114   if (c4x_parse_pragma ("DATA_SECTION", &func, &sect))
 115     return;
 116   data_tree = chainon (data_tree,
 117                        build_tree_list (func,
 118                                         build_tree_list (NULL_TREE, sect)));
 119 }
 120
 121 void
 122 c4x_pr_FUNC_IS_PURE (pfile)
 123      cpp_reader *pfile ATTRIBUTE_UNUSED;
 124 {
 125   tree func;
 126
 127   if (c4x_parse_pragma ("FUNC_IS_PURE", &func, 0))
 128     return;
 129   pure_tree = chainon (pure_tree, build_tree_list (func, NULL_TREE));
 130 }
 131
 132 void
 133 c4x_pr_FUNC_NEVER_RETURNS (pfile)
 134      cpp_reader *pfile ATTRIBUTE_UNUSED;
 135 {
 136   tree func;
 137
 138   if (c4x_parse_pragma ("FUNC_NEVER_RETURNS", &func, 0))
 139     return;
 140   noreturn_tree = chainon (noreturn_tree, build_tree_list (func, NULL_TREE));
 141 }
 142
 143 void
 144 c4x_pr_INTERRUPT (pfile)
 145      cpp_reader *pfile ATTRIBUTE_UNUSED;
 146 {
 147   tree func;
 148
 149   if (c4x_parse_pragma ("INTERRUPT", &func, 0))
 150     return;
 151   interrupt_tree = chainon (interrupt_tree, build_tree_list (func, NULL_TREE));
 152 }
 153
 154 /* Used for FUNC_CANNOT_INLINE, FUNC_EXT_CALLED, FUNC_IS_SYSTEM,
 155    FUNC_NO_GLOBAL_ASG, and FUNC_NO_IND_ASG.  */
 156 void
 157 c4x_pr_ignored (pfile)
 158      cpp_reader *pfile ATTRIBUTE_UNUSED;
 159 {
 160 }