Mercurial > hg > CbC > CbC_gcc
annotate gcc/varpool.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Callgraph handling code. |
|
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2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2010, 2011 |
| 0 | 3 Free Software Foundation, Inc. |
| 4 Contributed by Jan Hubicka | |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 #include "config.h" | |
| 23 #include "system.h" | |
| 24 #include "coretypes.h" | |
| 25 #include "tm.h" | |
| 26 #include "tree.h" | |
| 27 #include "cgraph.h" | |
| 28 #include "langhooks.h" | |
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29 #include "diagnostic-core.h" |
| 0 | 30 #include "hashtab.h" |
| 31 #include "ggc.h" | |
| 32 #include "timevar.h" | |
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33 #include "debug.h" |
| 0 | 34 #include "target.h" |
| 35 #include "output.h" | |
| 36 #include "gimple.h" | |
| 37 #include "tree-flow.h" | |
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38 #include "flags.h" |
| 0 | 39 |
| 40 /* This file contains basic routines manipulating variable pool. | |
| 41 | |
| 42 Varpool acts as interface in between the front-end and middle-end | |
| 43 and drives the decision process on what variables and when are | |
| 44 going to be compiled. | |
| 45 | |
| 46 The varpool nodes are allocated lazily for declarations | |
| 47 either by frontend or at callgraph construction time. | |
| 48 All variables supposed to be output into final file needs to be | |
| 49 explicitly marked by frontend via VARPOOL_FINALIZE_DECL function. */ | |
| 50 | |
| 51 /* Hash table used to convert declarations into nodes. */ | |
| 52 static GTY((param_is (struct varpool_node))) htab_t varpool_hash; | |
| 53 | |
| 54 /* The linked list of cgraph varpool nodes. | |
| 55 Linked via node->next pointer. */ | |
| 56 struct varpool_node *varpool_nodes; | |
| 57 | |
| 58 /* Queue of cgraph nodes scheduled to be lowered and output. | |
| 59 The queue is maintained via mark_needed_node, linked via node->next_needed | |
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60 pointer. |
| 0 | 61 |
| 62 LAST_NEEDED_NODE points to the end of queue, so it can be | |
| 63 maintained in forward order. GTY is needed to make it friendly to | |
| 64 PCH. | |
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65 |
| 0 | 66 During compilation we construct the queue of needed variables |
| 67 twice: first time it is during cgraph construction, second time it is at the | |
| 68 end of compilation in VARPOOL_REMOVE_UNREFERENCED_DECLS so we can avoid | |
| 69 optimized out variables being output. | |
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70 |
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71 Each variable is thus first analyzed and then later possibly output. |
| 0 | 72 FIRST_UNANALYZED_NODE points to first node in queue that was not analyzed |
| 73 yet and is moved via VARPOOL_ANALYZE_PENDING_DECLS. */ | |
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74 |
| 0 | 75 struct varpool_node *varpool_nodes_queue; |
| 76 static GTY(()) struct varpool_node *varpool_last_needed_node; | |
| 77 static GTY(()) struct varpool_node *varpool_first_unanalyzed_node; | |
| 78 | |
| 79 /* Lists all assembled variables to be sent to debugger output later on. */ | |
| 80 static GTY(()) struct varpool_node *varpool_assembled_nodes_queue; | |
| 81 | |
| 82 /* Return name of the node used in debug output. */ | |
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83 const char * |
| 0 | 84 varpool_node_name (struct varpool_node *node) |
| 85 { | |
| 86 return lang_hooks.decl_printable_name (node->decl, 2); | |
| 87 } | |
| 88 | |
| 89 /* Returns a hash code for P. */ | |
| 90 static hashval_t | |
| 91 hash_varpool_node (const void *p) | |
| 92 { | |
| 93 const struct varpool_node *n = (const struct varpool_node *) p; | |
| 94 return (hashval_t) DECL_UID (n->decl); | |
| 95 } | |
| 96 | |
| 97 /* Returns nonzero if P1 and P2 are equal. */ | |
| 98 static int | |
| 99 eq_varpool_node (const void *p1, const void *p2) | |
| 100 { | |
| 101 const struct varpool_node *n1 = | |
| 102 (const struct varpool_node *) p1; | |
| 103 const struct varpool_node *n2 = | |
| 104 (const struct varpool_node *) p2; | |
| 105 return DECL_UID (n1->decl) == DECL_UID (n2->decl); | |
| 106 } | |
| 107 | |
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108 /* Return varpool node assigned to DECL without creating new one. */ |
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109 struct varpool_node * |
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110 varpool_get_node (const_tree decl) |
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111 { |
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112 struct varpool_node key, **slot; |
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113 |
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114 gcc_assert (TREE_CODE (decl) == VAR_DECL |
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115 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))); |
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116 |
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117 if (!varpool_hash) |
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118 return NULL; |
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119 key.decl = CONST_CAST2 (tree, const_tree, decl); |
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120 slot = (struct varpool_node **) |
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121 htab_find_slot (varpool_hash, &key, NO_INSERT); |
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122 if (!slot) |
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123 return NULL; |
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124 return *slot; |
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125 } |
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126 |
| 0 | 127 /* Return varpool node assigned to DECL. Create new one when needed. */ |
| 128 struct varpool_node * | |
| 129 varpool_node (tree decl) | |
| 130 { | |
| 131 struct varpool_node key, *node, **slot; | |
| 132 | |
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133 gcc_assert (TREE_CODE (decl) == VAR_DECL |
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134 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))); |
| 0 | 135 |
| 136 if (!varpool_hash) | |
| 137 varpool_hash = htab_create_ggc (10, hash_varpool_node, | |
| 138 eq_varpool_node, NULL); | |
| 139 key.decl = decl; | |
| 140 slot = (struct varpool_node **) | |
| 141 htab_find_slot (varpool_hash, &key, INSERT); | |
| 142 if (*slot) | |
| 143 return *slot; | |
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144 node = ggc_alloc_cleared_varpool_node (); |
| 0 | 145 node->decl = decl; |
| 146 node->order = cgraph_order++; | |
| 147 node->next = varpool_nodes; | |
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148 ipa_empty_ref_list (&node->ref_list); |
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149 if (varpool_nodes) |
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150 varpool_nodes->prev = node; |
| 0 | 151 varpool_nodes = node; |
| 152 *slot = node; | |
| 153 return node; | |
| 154 } | |
| 155 | |
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156 /* Remove node from the varpool. */ |
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157 void |
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158 varpool_remove_node (struct varpool_node *node) |
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159 { |
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160 void **slot; |
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161 slot = htab_find_slot (varpool_hash, node, NO_INSERT); |
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162 gcc_assert (*slot == node); |
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163 htab_clear_slot (varpool_hash, slot); |
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164 gcc_assert (!varpool_assembled_nodes_queue); |
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165 if (!node->alias) |
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166 while (node->extra_name) |
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167 varpool_remove_node (node->extra_name); |
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168 if (node->next) |
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169 node->next->prev = node->prev; |
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170 if (node->prev) |
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171 node->prev->next = node->next; |
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172 else |
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173 { |
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174 if (node->alias && node->extra_name) |
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175 { |
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176 gcc_assert (node->extra_name->extra_name == node); |
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177 node->extra_name->extra_name = node->next; |
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178 } |
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179 else |
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180 { |
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181 gcc_assert (varpool_nodes == node); |
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182 varpool_nodes = node->next; |
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183 } |
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184 } |
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185 if (varpool_first_unanalyzed_node == node) |
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186 varpool_first_unanalyzed_node = node->next_needed; |
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187 if (node->next_needed) |
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188 node->next_needed->prev_needed = node->prev_needed; |
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189 else if (node->prev_needed) |
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190 { |
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191 gcc_assert (varpool_last_needed_node); |
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192 varpool_last_needed_node = node->prev_needed; |
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193 } |
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194 if (node->prev_needed) |
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195 node->prev_needed->next_needed = node->next_needed; |
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196 else if (node->next_needed) |
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197 { |
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198 gcc_assert (varpool_nodes_queue == node); |
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199 varpool_nodes_queue = node->next_needed; |
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200 } |
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201 if (node->same_comdat_group) |
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202 { |
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203 struct varpool_node *prev; |
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204 for (prev = node->same_comdat_group; |
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205 prev->same_comdat_group != node; |
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206 prev = prev->same_comdat_group) |
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207 ; |
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208 if (node->same_comdat_group == prev) |
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209 prev->same_comdat_group = NULL; |
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210 else |
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211 prev->same_comdat_group = node->same_comdat_group; |
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212 node->same_comdat_group = NULL; |
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213 } |
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214 ipa_remove_all_references (&node->ref_list); |
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215 ipa_remove_all_refering (&node->ref_list); |
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216 ggc_free (node); |
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217 } |
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218 |
| 0 | 219 /* Dump given cgraph node. */ |
| 220 void | |
| 221 dump_varpool_node (FILE *f, struct varpool_node *node) | |
| 222 { | |
| 223 fprintf (f, "%s:", varpool_node_name (node)); | |
| 224 fprintf (f, " availability:%s", | |
| 225 cgraph_function_flags_ready | |
| 226 ? cgraph_availability_names[cgraph_variable_initializer_availability (node)] | |
| 227 : "not-ready"); | |
|
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228 if (DECL_ASSEMBLER_NAME_SET_P (node->decl)) |
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229 fprintf (f, " (asm: %s)", IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (node->decl))); |
| 0 | 230 if (DECL_INITIAL (node->decl)) |
| 231 fprintf (f, " initialized"); | |
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232 if (TREE_ASM_WRITTEN (node->decl)) |
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233 fprintf (f, " (asm written)"); |
| 0 | 234 if (node->needed) |
| 235 fprintf (f, " needed"); | |
| 236 if (node->analyzed) | |
| 237 fprintf (f, " analyzed"); | |
| 238 if (node->finalized) | |
| 239 fprintf (f, " finalized"); | |
| 240 if (node->output) | |
| 241 fprintf (f, " output"); | |
| 242 if (node->externally_visible) | |
| 243 fprintf (f, " externally_visible"); | |
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244 if (node->resolution != LDPR_UNKNOWN) |
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245 fprintf (f, " %s", |
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246 ld_plugin_symbol_resolution_names[(int)node->resolution]); |
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247 if (node->in_other_partition) |
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248 fprintf (f, " in_other_partition"); |
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249 else if (node->used_from_other_partition) |
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250 fprintf (f, " used_from_other_partition"); |
| 0 | 251 fprintf (f, "\n"); |
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252 fprintf (f, " References: "); |
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253 ipa_dump_references (f, &node->ref_list); |
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254 fprintf (f, " Refering this var: "); |
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255 ipa_dump_refering (f, &node->ref_list); |
| 0 | 256 } |
| 257 | |
| 258 /* Dump the variable pool. */ | |
| 259 void | |
| 260 dump_varpool (FILE *f) | |
| 261 { | |
| 262 struct varpool_node *node; | |
| 263 | |
| 264 fprintf (f, "variable pool:\n\n"); | |
| 265 for (node = varpool_nodes; node; node = node->next) | |
| 266 dump_varpool_node (f, node); | |
| 267 } | |
| 268 | |
|
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269 /* Dump the variable pool to stderr. */ |
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270 |
|
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271 DEBUG_FUNCTION void |
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272 debug_varpool (void) |
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273 { |
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274 dump_varpool (stderr); |
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275 } |
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276 |
| 0 | 277 /* Given an assembler name, lookup node. */ |
| 278 struct varpool_node * | |
| 279 varpool_node_for_asm (tree asmname) | |
| 280 { | |
| 281 struct varpool_node *node; | |
| 282 | |
| 283 for (node = varpool_nodes; node ; node = node->next) | |
| 284 if (decl_assembler_name_equal (node->decl, asmname)) | |
| 285 return node; | |
| 286 | |
| 287 return NULL; | |
| 288 } | |
| 289 | |
| 290 /* Helper function for finalization code - add node into lists so it will | |
| 291 be analyzed and compiled. */ | |
| 292 static void | |
| 293 varpool_enqueue_needed_node (struct varpool_node *node) | |
| 294 { | |
| 295 if (varpool_last_needed_node) | |
|
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296 { |
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297 varpool_last_needed_node->next_needed = node; |
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298 node->prev_needed = varpool_last_needed_node; |
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299 } |
| 0 | 300 varpool_last_needed_node = node; |
| 301 node->next_needed = NULL; | |
| 302 if (!varpool_nodes_queue) | |
| 303 varpool_nodes_queue = node; | |
| 304 if (!varpool_first_unanalyzed_node) | |
| 305 varpool_first_unanalyzed_node = node; | |
| 306 notice_global_symbol (node->decl); | |
| 307 } | |
| 308 | |
| 309 /* Notify finalize_compilation_unit that given node is reachable | |
| 310 or needed. */ | |
| 311 void | |
| 312 varpool_mark_needed_node (struct varpool_node *node) | |
| 313 { | |
|
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314 if (node->alias && node->extra_name) |
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315 node = node->extra_name; |
| 0 | 316 if (!node->needed && node->finalized |
| 317 && !TREE_ASM_WRITTEN (node->decl)) | |
| 318 varpool_enqueue_needed_node (node); | |
| 319 node->needed = 1; | |
| 320 } | |
| 321 | |
| 322 /* Reset the queue of needed nodes. */ | |
|
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323 void |
| 0 | 324 varpool_reset_queue (void) |
| 325 { | |
| 326 varpool_last_needed_node = NULL; | |
| 327 varpool_nodes_queue = NULL; | |
| 328 varpool_first_unanalyzed_node = NULL; | |
| 329 } | |
| 330 | |
| 331 /* Determine if variable DECL is needed. That is, visible to something | |
| 332 either outside this translation unit, something magic in the system | |
| 333 configury */ | |
| 334 bool | |
| 335 decide_is_variable_needed (struct varpool_node *node, tree decl) | |
| 336 { | |
|
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337 /* If the user told us it is used, then it must be so. */ |
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338 if (node->force_output) |
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339 return true; |
|
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340 |
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341 gcc_assert (!DECL_EXTERNAL (decl)); |
| 0 | 342 |
| 343 /* Externally visible variables must be output. The exception is | |
| 344 COMDAT variables that must be output only when they are needed. */ | |
|
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345 if (TREE_PUBLIC (decl) |
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346 && !DECL_COMDAT (decl) |
| 0 | 347 && !DECL_EXTERNAL (decl)) |
| 348 return true; | |
| 349 | |
| 350 /* When not reordering top level variables, we have to assume that | |
| 351 we are going to keep everything. */ | |
|
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352 if (!flag_toplevel_reorder) |
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353 return true; |
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354 return false; |
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355 } |
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356 |
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357 /* Return if DECL is constant and its initial value is known (so we can do |
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358 constant folding using DECL_INITIAL (decl)). */ |
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359 |
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360 bool |
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361 const_value_known_p (tree decl) |
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362 { |
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363 if (TREE_CODE (decl) != VAR_DECL |
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364 &&TREE_CODE (decl) != CONST_DECL) |
| 0 | 365 return false; |
| 366 | |
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367 if (TREE_CODE (decl) == CONST_DECL |
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368 || DECL_IN_CONSTANT_POOL (decl)) |
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369 return true; |
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370 |
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371 gcc_assert (TREE_CODE (decl) == VAR_DECL); |
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372 |
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373 if (!TREE_READONLY (decl) || TREE_THIS_VOLATILE (decl)) |
| 0 | 374 return false; |
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375 |
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376 /* Gimplifier takes away constructors of local vars */ |
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377 if (!TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) |
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378 return DECL_INITIAL (decl) != NULL; |
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379 |
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380 gcc_assert (TREE_STATIC (decl) || DECL_EXTERNAL (decl)); |
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381 |
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382 /* Variables declared 'const' without an initializer |
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383 have zero as the initializer if they may not be |
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384 overridden at link or run time. */ |
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385 if (!DECL_INITIAL (decl) |
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386 && (DECL_EXTERNAL (decl) |
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387 || decl_replaceable_p (decl))) |
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388 return false; |
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389 |
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390 /* Variables declared `const' with an initializer are considered |
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391 to not be overwritable with different initializer by default. |
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392 |
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393 ??? Previously we behaved so for scalar variables but not for array |
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394 accesses. */ |
| 0 | 395 return true; |
| 396 } | |
| 397 | |
| 398 /* Mark DECL as finalized. By finalizing the declaration, frontend instruct the | |
| 399 middle end to output the variable to asm file, if needed or externally | |
| 400 visible. */ | |
| 401 void | |
| 402 varpool_finalize_decl (tree decl) | |
| 403 { | |
| 404 struct varpool_node *node = varpool_node (decl); | |
| 405 | |
|
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406 gcc_assert (TREE_STATIC (decl)); |
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407 |
| 0 | 408 /* The first declaration of a variable that comes through this function |
| 409 decides whether it is global (in C, has external linkage) | |
| 410 or local (in C, has internal linkage). So do nothing more | |
| 411 if this function has already run. */ | |
| 412 if (node->finalized) | |
| 413 { | |
| 414 if (cgraph_global_info_ready) | |
| 415 varpool_assemble_pending_decls (); | |
| 416 return; | |
| 417 } | |
| 418 if (node->needed) | |
| 419 varpool_enqueue_needed_node (node); | |
| 420 node->finalized = true; | |
|
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421 if (TREE_THIS_VOLATILE (decl) || DECL_PRESERVE_P (decl)) |
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422 node->force_output = true; |
| 0 | 423 |
| 424 if (decide_is_variable_needed (node, decl)) | |
| 425 varpool_mark_needed_node (node); | |
| 426 if (cgraph_global_info_ready) | |
| 427 varpool_assemble_pending_decls (); | |
| 428 } | |
| 429 | |
| 430 /* Return variable availability. See cgraph.h for description of individual | |
| 431 return values. */ | |
| 432 enum availability | |
| 433 cgraph_variable_initializer_availability (struct varpool_node *node) | |
| 434 { | |
| 435 gcc_assert (cgraph_function_flags_ready); | |
| 436 if (!node->finalized) | |
| 437 return AVAIL_NOT_AVAILABLE; | |
| 438 if (!TREE_PUBLIC (node->decl)) | |
| 439 return AVAIL_AVAILABLE; | |
| 440 /* If the variable can be overwritten, return OVERWRITABLE. Takes | |
| 441 care of at least two notable extensions - the COMDAT variables | |
| 442 used to share template instantiations in C++. */ | |
|
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443 if (!decl_replaceable_p (node->decl)) |
| 0 | 444 return AVAIL_OVERWRITABLE; |
| 445 return AVAIL_AVAILABLE; | |
| 446 } | |
| 447 | |
| 448 /* Walk the decls we marked as necessary and see if they reference new | |
| 449 variables or functions and add them into the worklists. */ | |
| 450 bool | |
| 451 varpool_analyze_pending_decls (void) | |
| 452 { | |
| 453 bool changed = false; | |
| 454 | |
|
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455 timevar_push (TV_VARPOOL); |
| 0 | 456 while (varpool_first_unanalyzed_node) |
| 457 { | |
|
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458 struct varpool_node *node = varpool_first_unanalyzed_node, *next; |
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459 tree decl = node->decl; |
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460 bool analyzed = node->analyzed; |
| 0 | 461 |
| 462 varpool_first_unanalyzed_node->analyzed = true; | |
| 463 | |
| 464 varpool_first_unanalyzed_node = varpool_first_unanalyzed_node->next_needed; | |
| 465 | |
|
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466 /* When reading back varpool at LTO time, we re-construct the queue in order |
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467 to have "needed" list right by inserting all needed nodes into varpool. |
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468 We however don't want to re-analyze already analyzed nodes. */ |
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469 if (!analyzed) |
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470 { |
|
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471 gcc_assert (!in_lto_p || cgraph_function_flags_ready); |
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472 /* Compute the alignment early so function body expanders are |
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473 already informed about increased alignment. */ |
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474 align_variable (decl, 0); |
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475 } |
| 0 | 476 if (DECL_INITIAL (decl)) |
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477 record_references_in_initializer (decl, analyzed); |
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478 if (node->same_comdat_group) |
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479 { |
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480 for (next = node->same_comdat_group; |
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481 next != node; |
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482 next = next->same_comdat_group) |
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483 varpool_mark_needed_node (next); |
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484 } |
| 0 | 485 changed = true; |
| 486 } | |
|
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487 timevar_pop (TV_VARPOOL); |
| 0 | 488 return changed; |
| 489 } | |
| 490 | |
| 491 /* Output one variable, if necessary. Return whether we output it. */ | |
| 492 bool | |
| 493 varpool_assemble_decl (struct varpool_node *node) | |
| 494 { | |
| 495 tree decl = node->decl; | |
| 496 | |
| 497 if (!TREE_ASM_WRITTEN (decl) | |
| 498 && !node->alias | |
|
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499 && !node->in_other_partition |
| 0 | 500 && !DECL_EXTERNAL (decl) |
| 501 && (TREE_CODE (decl) != VAR_DECL || !DECL_HAS_VALUE_EXPR_P (decl))) | |
| 502 { | |
| 503 assemble_variable (decl, 0, 1, 0); | |
| 504 if (TREE_ASM_WRITTEN (decl)) | |
| 505 { | |
|
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506 struct varpool_node *alias; |
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507 |
| 0 | 508 node->next_needed = varpool_assembled_nodes_queue; |
|
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509 node->prev_needed = NULL; |
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510 if (varpool_assembled_nodes_queue) |
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511 varpool_assembled_nodes_queue->prev_needed = node; |
| 0 | 512 varpool_assembled_nodes_queue = node; |
| 513 node->finalized = 1; | |
|
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514 |
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515 /* Also emit any extra name aliases. */ |
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516 for (alias = node->extra_name; alias; alias = alias->next) |
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517 { |
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518 /* Update linkage fields in case they've changed. */ |
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519 DECL_WEAK (alias->decl) = DECL_WEAK (decl); |
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520 TREE_PUBLIC (alias->decl) = TREE_PUBLIC (decl); |
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521 DECL_VISIBILITY (alias->decl) = DECL_VISIBILITY (decl); |
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522 assemble_alias (alias->decl, DECL_ASSEMBLER_NAME (decl)); |
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523 } |
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524 |
| 0 | 525 return true; |
| 526 } | |
| 527 } | |
| 528 | |
| 529 return false; | |
| 530 } | |
| 531 | |
| 532 /* Optimization of function bodies might've rendered some variables as | |
| 533 unnecessary so we want to avoid these from being compiled. | |
| 534 | |
| 535 This is done by pruning the queue and keeping only the variables that | |
| 536 really appear needed (ie they are either externally visible or referenced | |
| 537 by compiled function). Re-doing the reachability analysis on variables | |
| 538 brings back the remaining variables referenced by these. */ | |
| 539 void | |
| 540 varpool_remove_unreferenced_decls (void) | |
| 541 { | |
| 542 struct varpool_node *next, *node = varpool_nodes_queue; | |
| 543 | |
| 544 varpool_reset_queue (); | |
| 545 | |
|
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546 if (seen_error ()) |
| 0 | 547 return; |
| 548 | |
| 549 while (node) | |
| 550 { | |
| 551 next = node->next_needed; | |
| 552 node->needed = 0; | |
| 553 | |
|
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554 if (node->analyzed |
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555 && (!varpool_can_remove_if_no_refs (node) |
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556 /* We just expanded all function bodies. See if any of |
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557 them needed the variable. */ |
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558 || DECL_RTL_SET_P (node->decl))) |
| 0 | 559 varpool_mark_needed_node (node); |
| 560 | |
| 561 node = next; | |
| 562 } | |
| 563 /* Make sure we mark alias targets as used targets. */ | |
| 564 finish_aliases_1 (); | |
| 565 varpool_analyze_pending_decls (); | |
| 566 } | |
| 567 | |
|
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568 /* For variables in named sections make sure get_variable_section |
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569 is called before we switch to those sections. Then section |
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570 conflicts between read-only and read-only requiring relocations |
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571 sections can be resolved. */ |
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572 void |
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573 varpool_finalize_named_section_flags (struct varpool_node *node) |
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574 { |
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575 if (!TREE_ASM_WRITTEN (node->decl) |
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576 && !node->alias |
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577 && !node->in_other_partition |
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578 && !DECL_EXTERNAL (node->decl) |
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579 && TREE_CODE (node->decl) == VAR_DECL |
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580 && !DECL_HAS_VALUE_EXPR_P (node->decl) |
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581 && DECL_SECTION_NAME (node->decl)) |
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582 get_variable_section (node->decl, false); |
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583 } |
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584 |
| 0 | 585 /* Output all variables enqueued to be assembled. */ |
| 586 bool | |
| 587 varpool_assemble_pending_decls (void) | |
| 588 { | |
| 589 bool changed = false; | |
|
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590 struct varpool_node *node; |
| 0 | 591 |
|
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592 if (seen_error ()) |
| 0 | 593 return false; |
| 594 | |
|
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595 timevar_push (TV_VAROUT); |
| 0 | 596 /* EH might mark decls as needed during expansion. This should be safe since |
| 597 we don't create references to new function, but it should not be used | |
| 598 elsewhere. */ | |
| 599 varpool_analyze_pending_decls (); | |
| 600 | |
|
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601 for (node = varpool_nodes_queue; node; node = node->next_needed) |
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602 varpool_finalize_named_section_flags (node); |
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603 |
| 0 | 604 while (varpool_nodes_queue) |
| 605 { | |
| 606 struct varpool_node *node = varpool_nodes_queue; | |
| 607 | |
| 608 varpool_nodes_queue = varpool_nodes_queue->next_needed; | |
| 609 if (varpool_assemble_decl (node)) | |
| 610 changed = true; | |
| 611 else | |
|
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612 { |
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613 node->prev_needed = NULL; |
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614 node->next_needed = NULL; |
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615 } |
| 0 | 616 } |
| 617 /* varpool_nodes_queue is now empty, clear the pointer to the last element | |
| 618 in the queue. */ | |
| 619 varpool_last_needed_node = NULL; | |
|
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620 timevar_pop (TV_VAROUT); |
| 0 | 621 return changed; |
| 622 } | |
| 623 | |
| 624 /* Remove all elements from the queue so we can re-use it for debug output. */ | |
| 625 void | |
| 626 varpool_empty_needed_queue (void) | |
| 627 { | |
| 628 /* EH might mark decls as needed during expansion. This should be safe since | |
| 629 we don't create references to new function, but it should not be used | |
| 630 elsewhere. */ | |
| 631 varpool_analyze_pending_decls (); | |
| 632 | |
| 633 while (varpool_nodes_queue) | |
| 634 { | |
| 635 struct varpool_node *node = varpool_nodes_queue; | |
| 636 varpool_nodes_queue = varpool_nodes_queue->next_needed; | |
| 637 node->next_needed = NULL; | |
|
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638 node->prev_needed = NULL; |
| 0 | 639 } |
| 640 /* varpool_nodes_queue is now empty, clear the pointer to the last element | |
| 641 in the queue. */ | |
| 642 varpool_last_needed_node = NULL; | |
| 643 } | |
| 644 | |
| 645 /* Create a new global variable of type TYPE. */ | |
| 646 tree | |
| 647 add_new_static_var (tree type) | |
| 648 { | |
| 649 tree new_decl; | |
| 650 struct varpool_node *new_node; | |
| 651 | |
| 652 new_decl = create_tmp_var (type, NULL); | |
| 653 DECL_NAME (new_decl) = create_tmp_var_name (NULL); | |
| 654 TREE_READONLY (new_decl) = 0; | |
| 655 TREE_STATIC (new_decl) = 1; | |
| 656 TREE_USED (new_decl) = 1; | |
| 657 DECL_CONTEXT (new_decl) = NULL_TREE; | |
| 658 DECL_ABSTRACT (new_decl) = 0; | |
| 659 lang_hooks.dup_lang_specific_decl (new_decl); | |
| 660 create_var_ann (new_decl); | |
| 661 new_node = varpool_node (new_decl); | |
| 662 varpool_mark_needed_node (new_node); | |
| 663 add_referenced_var (new_decl); | |
| 664 varpool_finalize_decl (new_decl); | |
| 665 | |
| 666 return new_node->decl; | |
| 667 } | |
| 668 | |
|
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669 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful. |
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670 Extra name aliases are output whenever DECL is output. */ |
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671 |
|
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672 struct varpool_node * |
|
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673 varpool_extra_name_alias (tree alias, tree decl) |
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674 { |
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675 struct varpool_node key, *alias_node, *decl_node, **slot; |
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676 |
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677 #ifndef ASM_OUTPUT_DEF |
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678 /* If aliases aren't supported by the assembler, fail. */ |
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679 return false; |
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680 #endif |
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681 |
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682 gcc_assert (TREE_CODE (decl) == VAR_DECL); |
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683 gcc_assert (TREE_CODE (alias) == VAR_DECL); |
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684 /* Make sure the hash table has been created. */ |
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685 decl_node = varpool_node (decl); |
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686 |
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687 key.decl = alias; |
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688 |
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689 slot = (struct varpool_node **) htab_find_slot (varpool_hash, &key, INSERT); |
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690 |
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691 /* If the varpool_node has been already created, fail. */ |
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692 if (*slot) |
|
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693 return NULL; |
|
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694 |
|
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695 alias_node = ggc_alloc_cleared_varpool_node (); |
|
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696 alias_node->decl = alias; |
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697 alias_node->alias = 1; |
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698 alias_node->extra_name = decl_node; |
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699 alias_node->next = decl_node->extra_name; |
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700 ipa_empty_ref_list (&alias_node->ref_list); |
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701 if (decl_node->extra_name) |
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702 decl_node->extra_name->prev = alias_node; |
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703 decl_node->extra_name = alias_node; |
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704 *slot = alias_node; |
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705 return alias_node; |
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706 } |
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707 |
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708 /* Return true when NODE is known to be used from other (non-LTO) object file. |
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709 Known only when doing LTO via linker plugin. */ |
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710 |
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711 bool |
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712 varpool_used_from_object_file_p (struct varpool_node *node) |
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713 { |
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714 struct varpool_node *alias; |
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715 |
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716 if (!TREE_PUBLIC (node->decl)) |
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717 return false; |
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718 if (resolution_used_from_other_file_p (node->resolution)) |
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719 return true; |
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720 for (alias = node->extra_name; alias; alias = alias->next) |
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721 if (TREE_PUBLIC (alias->decl) |
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722 && resolution_used_from_other_file_p (alias->resolution)) |
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723 return true; |
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724 return false; |
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725 } |
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726 |
| 0 | 727 #include "gt-varpool.h" |