Mercurial > hg > CbC > CbC_gcc
annotate gcc/c-gimplify.c @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Mon, 24 May 2010 12:47:05 +0900 |
parents | 77e2b8dfacca |
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rev | line source |
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0 | 1 /* Tree lowering pass. This pass gimplifies the tree representation built |
2 by the C-based front ends. The structure of gimplified, or | |
3 language-independent, trees is dictated by the grammar described in this | |
4 file. | |
5 Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008 | |
6 Free Software Foundation, Inc. | |
7 Lowering of expressions contributed by Sebastian Pop <s.pop@laposte.net> | |
8 Re-written to support lowering of whole function trees, documentation | |
9 and miscellaneous cleanups by Diego Novillo <dnovillo@redhat.com> | |
10 | |
11 This file is part of GCC. | |
12 | |
13 GCC is free software; you can redistribute it and/or modify it under | |
14 the terms of the GNU General Public License as published by the Free | |
15 Software Foundation; either version 3, or (at your option) any later | |
16 version. | |
17 | |
18 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
19 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
20 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
21 for more details. | |
22 | |
23 You should have received a copy of the GNU General Public License | |
24 along with GCC; see the file COPYING3. If not see | |
25 <http://www.gnu.org/licenses/>. */ | |
26 | |
27 #include "config.h" | |
28 #include "system.h" | |
29 #include "coretypes.h" | |
30 #include "tm.h" | |
31 #include "tree.h" | |
32 #include "c-tree.h" | |
33 #include "c-common.h" | |
34 #include "gimple.h" | |
35 #include "hard-reg-set.h" | |
36 #include "basic-block.h" | |
37 #include "tree-flow.h" | |
38 #include "tree-inline.h" | |
39 #include "diagnostic.h" | |
40 #include "langhooks.h" | |
41 #include "langhooks-def.h" | |
42 #include "flags.h" | |
43 #include "rtl.h" | |
44 #include "toplev.h" | |
45 #include "tree-dump.h" | |
46 #include "c-pretty-print.h" | |
47 #include "cgraph.h" | |
48 | |
49 | |
50 /* The gimplification pass converts the language-dependent trees | |
51 (ld-trees) emitted by the parser into language-independent trees | |
52 (li-trees) that are the target of SSA analysis and transformations. | |
53 | |
54 Language-independent trees are based on the SIMPLE intermediate | |
55 representation used in the McCAT compiler framework: | |
56 | |
57 "Designing the McCAT Compiler Based on a Family of Structured | |
58 Intermediate Representations," | |
59 L. Hendren, C. Donawa, M. Emami, G. Gao, Justiani, and B. Sridharan, | |
60 Proceedings of the 5th International Workshop on Languages and | |
61 Compilers for Parallel Computing, no. 757 in Lecture Notes in | |
62 Computer Science, New Haven, Connecticut, pp. 406-420, | |
63 Springer-Verlag, August 3-5, 1992. | |
64 | |
65 http://www-acaps.cs.mcgill.ca/info/McCAT/McCAT.html | |
66 | |
67 Basically, we walk down gimplifying the nodes that we encounter. As we | |
68 walk back up, we check that they fit our constraints, and copy them | |
69 into temporaries if not. */ | |
70 | |
71 /* Gimplification of statement trees. */ | |
72 | |
73 /* Convert the tree representation of FNDECL from C frontend trees to | |
74 GENERIC. */ | |
75 | |
76 void | |
77 c_genericize (tree fndecl) | |
78 { | |
79 FILE *dump_orig; | |
80 int local_dump_flags; | |
81 struct cgraph_node *cgn; | |
82 | |
83 /* Dump the C-specific tree IR. */ | |
84 dump_orig = dump_begin (TDI_original, &local_dump_flags); | |
85 if (dump_orig) | |
86 { | |
87 fprintf (dump_orig, "\n;; Function %s", | |
88 lang_hooks.decl_printable_name (fndecl, 2)); | |
89 fprintf (dump_orig, " (%s)\n", | |
90 (!DECL_ASSEMBLER_NAME_SET_P (fndecl) ? "null" | |
91 : IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)))); | |
92 fprintf (dump_orig, ";; enabled by -%s\n", dump_flag_name (TDI_original)); | |
93 fprintf (dump_orig, "\n"); | |
94 | |
95 if (local_dump_flags & TDF_RAW) | |
96 dump_node (DECL_SAVED_TREE (fndecl), | |
97 TDF_SLIM | local_dump_flags, dump_orig); | |
98 else | |
99 print_c_tree (dump_orig, DECL_SAVED_TREE (fndecl)); | |
100 fprintf (dump_orig, "\n"); | |
101 | |
102 dump_end (TDI_original, dump_orig); | |
103 } | |
104 | |
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77e2b8dfacca
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parents:
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105 /* Dump all nested functions now. */ |
0 | 106 cgn = cgraph_node (fndecl); |
107 for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested) | |
108 c_genericize (cgn->decl); | |
109 } | |
110 | |
111 static void | |
112 add_block_to_enclosing (tree block) | |
113 { | |
114 unsigned i; | |
115 tree enclosing; | |
116 gimple bind; | |
117 VEC(gimple, heap) *stack = gimple_bind_expr_stack (); | |
118 | |
119 for (i = 0; VEC_iterate (gimple, stack, i, bind); i++) | |
120 if (gimple_bind_block (bind)) | |
121 break; | |
122 | |
123 enclosing = gimple_bind_block (bind); | |
124 BLOCK_SUBBLOCKS (enclosing) = chainon (BLOCK_SUBBLOCKS (enclosing), block); | |
125 } | |
126 | |
127 /* Genericize a scope by creating a new BIND_EXPR. | |
128 BLOCK is either a BLOCK representing the scope or a chain of _DECLs. | |
129 In the latter case, we need to create a new BLOCK and add it to the | |
130 BLOCK_SUBBLOCKS of the enclosing block. | |
131 BODY is a chain of C _STMT nodes for the contents of the scope, to be | |
132 genericized. */ | |
133 | |
134 tree | |
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135 c_build_bind_expr (location_t loc, tree block, tree body) |
0 | 136 { |
137 tree decls, bind; | |
138 | |
139 if (block == NULL_TREE) | |
140 decls = NULL_TREE; | |
141 else if (TREE_CODE (block) == BLOCK) | |
142 decls = BLOCK_VARS (block); | |
143 else | |
144 { | |
145 decls = block; | |
146 if (DECL_ARTIFICIAL (decls)) | |
147 block = NULL_TREE; | |
148 else | |
149 { | |
150 block = make_node (BLOCK); | |
151 BLOCK_VARS (block) = decls; | |
152 add_block_to_enclosing (block); | |
153 } | |
154 } | |
155 | |
156 if (!body) | |
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157 body = build_empty_stmt (loc); |
0 | 158 if (decls || block) |
159 { | |
160 bind = build3 (BIND_EXPR, void_type_node, decls, body, block); | |
161 TREE_SIDE_EFFECTS (bind) = 1; | |
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162 SET_EXPR_LOCATION (bind, loc); |
0 | 163 } |
164 else | |
165 bind = body; | |
166 | |
167 return bind; | |
168 } | |
169 | |
170 /* Gimplification of expression trees. */ | |
171 | |
172 /* Do C-specific gimplification on *EXPR_P. PRE_P and POST_P are as in | |
173 gimplify_expr. */ | |
174 | |
175 int | |
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176 c_gimplify_expr (tree *expr_p, gimple_seq *pre_p ATTRIBUTE_UNUSED, |
0 | 177 gimple_seq *post_p ATTRIBUTE_UNUSED) |
178 { | |
179 enum tree_code code = TREE_CODE (*expr_p); | |
180 | |
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181 /* This is handled mostly by gimplify.c, but we have to deal with |
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182 not warning about int x = x; as it is a GCC extension to turn off |
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183 this warning but only if warn_init_self is zero. */ |
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184 if (code == DECL_EXPR |
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185 && TREE_CODE (DECL_EXPR_DECL (*expr_p)) == VAR_DECL |
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186 && !DECL_EXTERNAL (DECL_EXPR_DECL (*expr_p)) |
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187 && !TREE_STATIC (DECL_EXPR_DECL (*expr_p)) |
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188 && (DECL_INITIAL (DECL_EXPR_DECL (*expr_p)) == DECL_EXPR_DECL (*expr_p)) |
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189 && !warn_init_self) |
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190 TREE_NO_WARNING (DECL_EXPR_DECL (*expr_p)) = 1; |
0 | 191 |
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192 return GS_UNHANDLED; |
0 | 193 } |