Mercurial > hg > CbC > CbC_gcc

comparison gcc/c-family/c-semantics.c @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children 1830386684a0
comparison
equal deleted inserted replaced
111:04ced10e8804 131:84e7813d76e9
1 /* This file contains subroutine used by the C front-end to construct GENERIC. 1 /* This file contains subroutine used by the C front-end to construct GENERIC.
2 Copyright (C) 2000-2017 Free Software Foundation, Inc. 2 Copyright (C) 2000-2018 Free Software Foundation, Inc.
3 Written by Benjamin Chelf (chelf@codesourcery.com). 3 Written by Benjamin Chelf (chelf@codesourcery.com).
4 4
5 This file is part of GCC. 5 This file is part of GCC.
6 6
7 GCC is free software; you can redistribute it and/or modify it under 7 GCC is free software; you can redistribute it and/or modify it under
31 { 31 {
32 tree t; 32 tree t;
33 t = alloc_stmt_list (); 33 t = alloc_stmt_list ();
34 vec_safe_push (stmt_list_stack, t); 34 vec_safe_push (stmt_list_stack, t);
35 return t; 35 return t;
36 }
37
38 /* Return TRUE if, after I, there are any nondebug stmts. */
39
40 static inline bool
41 only_debug_stmts_after_p (tree_stmt_iterator i)
42 {
43 for (tsi_next (&i); !tsi_end_p (i); tsi_next (&i))
44 if (TREE_CODE (tsi_stmt (i)) != DEBUG_BEGIN_STMT)
45 return false;
46 return true;
36 } 47 }
37 48
38 /* Finish the statement tree rooted at T. */ 49 /* Finish the statement tree rooted at T. */
39 50
40 tree 51 tree
74 u = tsi_stmt (i); 85 u = tsi_stmt (i);
75 tsi_delink (&i); 86 tsi_delink (&i);
76 free_stmt_list (t); 87 free_stmt_list (t);
77 t = u; 88 t = u;
78 } 89 }
90 /* If the statement list contained a debug begin stmt and a
91 statement list, move the debug begin stmt into the statement
92 list and return it. */
93 else if (!tsi_end_p (i)
94 && TREE_CODE (tsi_stmt (i)) == DEBUG_BEGIN_STMT)
95 {
96 u = tsi_stmt (i);
97 tsi_next (&i);
98 if (tsi_one_before_end_p (i)
99 && TREE_CODE (tsi_stmt (i)) == STATEMENT_LIST)
100 {
101 tree l = tsi_stmt (i);
102 tsi_prev (&i);
103 tsi_delink (&i);
104 tsi_delink (&i);
105 i = tsi_start (l);
106 free_stmt_list (t);
107 t = l;
108 tsi_link_before (&i, u, TSI_SAME_STMT);
109 }
110 while (!tsi_end_p (i)
111 && TREE_CODE (tsi_stmt (i)) == DEBUG_BEGIN_STMT)
112 tsi_next (&i);
113 /* If there are only debug stmts in the list, without them
114 we'd have an empty stmt without side effects. If there's
115 only one nondebug stmt, we'd have extracted the stmt and
116 dropped the list, and we'd take TREE_SIDE_EFFECTS from
117 that statement. In either case, keep the list's
118 TREE_SIDE_EFFECTS in sync. */
119 if (tsi_end_p (i))
120 TREE_SIDE_EFFECTS (t) = 0;
121 else if (only_debug_stmts_after_p (i))
122 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (tsi_stmt (i));
123 }
79 } 124 }
80 125
81 return t; 126 return t;
82 } 127 }
83 128