Mercurial > hg > CbC > CbC_gcc
annotate gcc/ipa-pure-const.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Callgraph based analysis of static variables. |
|
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2 Copyright (C) 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc. |
| 0 | 3 Contributed by Kenneth Zadeck <zadeck@naturalbridge.com> |
| 4 | |
| 5 This file is part of GCC. | |
| 6 | |
| 7 GCC is free software; you can redistribute it and/or modify it under | |
| 8 the terms of the GNU General Public License as published by the Free | |
| 9 Software Foundation; either version 3, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 /* This file marks functions as being either const (TREE_READONLY) or | |
| 22 pure (DECL_PURE_P). It can also set a variant of these that | |
| 23 are allowed to loop indefinitely (DECL_LOOPING_CONST_PURE_P). | |
| 24 | |
| 25 This must be run after inlining decisions have been made since | |
| 26 otherwise, the local sets will not contain information that is | |
| 27 consistent with post inlined state. The global sets are not prone | |
| 28 to this problem since they are by definition transitive. */ | |
| 29 | |
| 30 /* The code in this module is called by the ipa pass manager. It | |
| 31 should be one of the later passes since it's information is used by | |
| 32 the rest of the compilation. */ | |
| 33 | |
| 34 #include "config.h" | |
| 35 #include "system.h" | |
| 36 #include "coretypes.h" | |
| 37 #include "tm.h" | |
| 38 #include "tree.h" | |
| 39 #include "tree-flow.h" | |
| 40 #include "tree-inline.h" | |
| 41 #include "tree-pass.h" | |
| 42 #include "langhooks.h" | |
| 43 #include "pointer-set.h" | |
| 44 #include "ggc.h" | |
| 45 #include "ipa-utils.h" | |
| 46 #include "gimple.h" | |
| 47 #include "cgraph.h" | |
| 48 #include "output.h" | |
| 49 #include "flags.h" | |
| 50 #include "timevar.h" | |
| 51 #include "diagnostic.h" | |
| 52 #include "langhooks.h" | |
| 53 #include "target.h" | |
|
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54 #include "lto-streamer.h" |
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55 #include "cfgloop.h" |
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56 #include "tree-scalar-evolution.h" |
| 0 | 57 |
| 58 static struct pointer_set_t *visited_nodes; | |
| 59 | |
| 60 /* Lattice values for const and pure functions. Everything starts out | |
| 61 being const, then may drop to pure and then neither depending on | |
| 62 what is found. */ | |
| 63 enum pure_const_state_e | |
| 64 { | |
| 65 IPA_CONST, | |
| 66 IPA_PURE, | |
| 67 IPA_NEITHER | |
| 68 }; | |
| 69 | |
| 70 /* Holder for the const_state. There is one of these per function | |
| 71 decl. */ | |
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72 struct funct_state_d |
| 0 | 73 { |
| 74 /* See above. */ | |
| 75 enum pure_const_state_e pure_const_state; | |
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76 /* What user set here; we can be always sure about this. */ |
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77 enum pure_const_state_e state_previously_known; |
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78 bool looping_previously_known; |
| 0 | 79 |
| 80 /* True if the function could possibly infinite loop. There are a | |
| 81 lot of ways that this could be determined. We are pretty | |
| 82 conservative here. While it is possible to cse pure and const | |
| 83 calls, it is not legal to have dce get rid of the call if there | |
| 84 is a possibility that the call could infinite loop since this is | |
| 85 a behavioral change. */ | |
| 86 bool looping; | |
| 87 | |
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88 bool can_throw; |
| 0 | 89 }; |
| 90 | |
| 91 typedef struct funct_state_d * funct_state; | |
| 92 | |
| 93 /* The storage of the funct_state is abstracted because there is the | |
| 94 possibility that it may be desirable to move this to the cgraph | |
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95 local info. */ |
| 0 | 96 |
| 97 /* Array, indexed by cgraph node uid, of function states. */ | |
| 98 | |
| 99 DEF_VEC_P (funct_state); | |
| 100 DEF_VEC_ALLOC_P (funct_state, heap); | |
| 101 static VEC (funct_state, heap) *funct_state_vec; | |
| 102 | |
| 103 /* Holders of ipa cgraph hooks: */ | |
| 104 static struct cgraph_node_hook_list *function_insertion_hook_holder; | |
| 105 static struct cgraph_2node_hook_list *node_duplication_hook_holder; | |
| 106 static struct cgraph_node_hook_list *node_removal_hook_holder; | |
| 107 | |
| 108 /* Init the function state. */ | |
| 109 | |
| 110 static void | |
| 111 finish_state (void) | |
| 112 { | |
| 113 free (funct_state_vec); | |
| 114 } | |
| 115 | |
| 116 | |
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117 /* Return the function state from NODE. */ |
| 0 | 118 |
| 119 static inline funct_state | |
| 120 get_function_state (struct cgraph_node *node) | |
| 121 { | |
| 122 if (!funct_state_vec | |
| 123 || VEC_length (funct_state, funct_state_vec) <= (unsigned int)node->uid) | |
| 124 return NULL; | |
| 125 return VEC_index (funct_state, funct_state_vec, node->uid); | |
| 126 } | |
| 127 | |
| 128 /* Set the function state S for NODE. */ | |
| 129 | |
| 130 static inline void | |
| 131 set_function_state (struct cgraph_node *node, funct_state s) | |
| 132 { | |
| 133 if (!funct_state_vec | |
| 134 || VEC_length (funct_state, funct_state_vec) <= (unsigned int)node->uid) | |
| 135 VEC_safe_grow_cleared (funct_state, heap, funct_state_vec, node->uid + 1); | |
| 136 VEC_replace (funct_state, funct_state_vec, node->uid, s); | |
| 137 } | |
| 138 | |
| 139 /* Check to see if the use (or definition when CHECKING_WRITE is true) | |
| 140 variable T is legal in a function that is either pure or const. */ | |
| 141 | |
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142 static inline void |
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143 check_decl (funct_state local, |
| 0 | 144 tree t, bool checking_write) |
| 145 { | |
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146 /* Do not want to do anything with volatile except mark any |
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147 function that uses one to be not const or pure. */ |
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148 if (TREE_THIS_VOLATILE (t)) |
| 0 | 149 { |
| 150 local->pure_const_state = IPA_NEITHER; | |
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151 if (dump_file) |
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152 fprintf (dump_file, " Volatile operand is not const/pure"); |
| 0 | 153 return; |
| 154 } | |
| 155 | |
| 156 /* Do not care about a local automatic that is not static. */ | |
| 157 if (!TREE_STATIC (t) && !DECL_EXTERNAL (t)) | |
| 158 return; | |
| 159 | |
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160 /* If the variable has the "used" attribute, treat it as if it had a |
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161 been touched by the devil. */ |
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162 if (lookup_attribute ("used", DECL_ATTRIBUTES (t))) |
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163 { |
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164 local->pure_const_state = IPA_NEITHER; |
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165 if (dump_file) |
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166 fprintf (dump_file, " Used static/global variable is not const/pure\n"); |
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167 return; |
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168 } |
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169 |
| 0 | 170 /* Since we have dealt with the locals and params cases above, if we |
| 171 are CHECKING_WRITE, this cannot be a pure or constant | |
| 172 function. */ | |
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173 if (checking_write) |
| 0 | 174 { |
| 175 local->pure_const_state = IPA_NEITHER; | |
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176 if (dump_file) |
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177 fprintf (dump_file, " static/global memory write is not const/pure\n"); |
| 0 | 178 return; |
| 179 } | |
| 180 | |
| 181 if (DECL_EXTERNAL (t) || TREE_PUBLIC (t)) | |
| 182 { | |
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183 /* Readonly reads are safe. */ |
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184 if (TREE_READONLY (t) && !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (t))) |
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185 return; /* Read of a constant, do not change the function state. */ |
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186 else |
| 0 | 187 { |
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188 if (dump_file) |
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189 fprintf (dump_file, " global memory read is not const\n"); |
| 0 | 190 /* Just a regular read. */ |
| 191 if (local->pure_const_state == IPA_CONST) | |
| 192 local->pure_const_state = IPA_PURE; | |
| 193 } | |
| 194 } | |
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195 else |
| 0 | 196 { |
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197 /* Compilation level statics can be read if they are readonly |
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198 variables. */ |
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199 if (TREE_READONLY (t)) |
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200 return; |
| 0 | 201 |
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202 if (dump_file) |
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203 fprintf (dump_file, " static memory read is not const\n"); |
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204 /* Just a regular read. */ |
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205 if (local->pure_const_state == IPA_CONST) |
| 0 | 206 local->pure_const_state = IPA_PURE; |
| 207 } | |
| 208 } | |
| 209 | |
| 210 | |
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211 /* Check to see if the use (or definition when CHECKING_WRITE is true) |
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212 variable T is legal in a function that is either pure or const. */ |
| 0 | 213 |
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214 static inline void |
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215 check_op (funct_state local, tree t, bool checking_write) |
| 0 | 216 { |
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217 t = get_base_address (t); |
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218 if (t && TREE_THIS_VOLATILE (t)) |
| 0 | 219 { |
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220 local->pure_const_state = IPA_NEITHER; |
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221 if (dump_file) |
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222 fprintf (dump_file, " Volatile indirect ref is not const/pure\n"); |
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223 return; |
| 0 | 224 } |
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225 else if (t |
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226 && INDIRECT_REF_P (t) |
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227 && TREE_CODE (TREE_OPERAND (t, 0)) == SSA_NAME |
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228 && !ptr_deref_may_alias_global_p (TREE_OPERAND (t, 0))) |
| 0 | 229 { |
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230 if (dump_file) |
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231 fprintf (dump_file, " Indirect ref to local memory is OK\n"); |
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232 return; |
| 0 | 233 } |
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234 else if (checking_write) |
| 0 | 235 { |
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236 local->pure_const_state = IPA_NEITHER; |
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237 if (dump_file) |
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238 fprintf (dump_file, " Indirect ref write is not const/pure\n"); |
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239 return; |
| 0 | 240 } |
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241 else |
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242 { |
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243 if (dump_file) |
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244 fprintf (dump_file, " Indirect ref read is not const\n"); |
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245 if (local->pure_const_state == IPA_CONST) |
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246 local->pure_const_state = IPA_PURE; |
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247 } |
| 0 | 248 } |
| 249 | |
| 250 /* Check the parameters of a function call to CALL_EXPR to see if | |
| 251 there are any references in the parameters that are not allowed for | |
| 252 pure or const functions. Also check to see if this is either an | |
| 253 indirect call, a call outside the compilation unit, or has special | |
| 254 attributes that may also effect the purity. The CALL_EXPR node for | |
| 255 the entire call expression. */ | |
| 256 | |
| 257 static void | |
|
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258 check_call (funct_state local, gimple call, bool ipa) |
| 0 | 259 { |
| 260 int flags = gimple_call_flags (call); | |
|
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261 tree callee_t = gimple_call_fndecl (call); |
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262 bool possibly_throws = stmt_could_throw_p (call); |
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263 bool possibly_throws_externally = (possibly_throws |
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264 && stmt_can_throw_external (call)); |
| 0 | 265 |
|
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266 if (possibly_throws) |
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267 { |
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268 unsigned int i; |
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269 for (i = 0; i < gimple_num_ops (call); i++) |
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270 if (gimple_op (call, i) |
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271 && tree_could_throw_p (gimple_op (call, i))) |
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272 { |
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273 if (possibly_throws && flag_non_call_exceptions) |
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274 { |
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275 if (dump_file) |
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276 fprintf (dump_file, " operand can throw; looping\n"); |
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277 local->looping = true; |
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278 } |
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279 if (possibly_throws_externally) |
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280 { |
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281 if (dump_file) |
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282 fprintf (dump_file, " operand can throw externally\n"); |
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283 local->can_throw = true; |
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284 } |
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285 } |
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286 } |
| 0 | 287 |
| 288 /* The const and pure flags are set by a variety of places in the | |
| 289 compiler (including here). If someone has already set the flags | |
| 290 for the callee, (such as for some of the builtins) we will use | |
|
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291 them, otherwise we will compute our own information. |
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292 |
| 0 | 293 Const and pure functions have less clobber effects than other |
| 294 functions so we process these first. Otherwise if it is a call | |
| 295 outside the compilation unit or an indirect call we punt. This | |
| 296 leaves local calls which will be processed by following the call | |
|
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297 graph. */ |
| 0 | 298 if (callee_t) |
| 299 { | |
| 300 /* When bad things happen to bad functions, they cannot be const | |
| 301 or pure. */ | |
| 302 if (setjmp_call_p (callee_t)) | |
| 303 { | |
|
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304 if (dump_file) |
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305 fprintf (dump_file, " setjmp is not const/pure\n"); |
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306 local->looping = true; |
| 0 | 307 local->pure_const_state = IPA_NEITHER; |
| 308 } | |
| 309 | |
| 310 if (DECL_BUILT_IN_CLASS (callee_t) == BUILT_IN_NORMAL) | |
| 311 switch (DECL_FUNCTION_CODE (callee_t)) | |
| 312 { | |
| 313 case BUILT_IN_LONGJMP: | |
| 314 case BUILT_IN_NONLOCAL_GOTO: | |
|
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315 if (dump_file) |
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316 fprintf (dump_file, " longjmp and nonlocal goto is not const/pure\n"); |
| 0 | 317 local->pure_const_state = IPA_NEITHER; |
|
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318 local->looping = true; |
| 0 | 319 break; |
| 320 default: | |
| 321 break; | |
| 322 } | |
| 323 } | |
| 324 | |
|
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325 /* When not in IPA mode, we can still handle self recursion. */ |
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326 if (!ipa && callee_t == current_function_decl) |
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327 local->looping = true; |
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328 /* Either calle is unknown or we are doing local analysis. |
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329 Look to see if there are any bits available for the callee (such as by |
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330 declaration or because it is builtin) and process solely on the basis of |
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331 those bits. */ |
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332 else if (!ipa || !callee_t) |
| 0 | 333 { |
|
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334 if (possibly_throws && flag_non_call_exceptions) |
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335 { |
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336 if (dump_file) |
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337 fprintf (dump_file, " can throw; looping\n"); |
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338 local->looping = true; |
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339 } |
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340 if (possibly_throws_externally) |
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341 { |
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342 if (dump_file) |
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343 { |
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344 fprintf (dump_file, " can throw externally to lp %i\n", |
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345 lookup_stmt_eh_lp (call)); |
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346 if (callee_t) |
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347 fprintf (dump_file, " callee:%s\n", |
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348 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (callee_t))); |
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349 } |
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350 local->can_throw = true; |
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351 } |
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352 if (flags & ECF_CONST) |
| 0 | 353 { |
|
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354 if (callee_t && DECL_LOOPING_CONST_OR_PURE_P (callee_t)) |
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355 local->looping = true; |
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356 } |
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357 else if (flags & ECF_PURE) |
| 0 | 358 { |
|
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359 if (callee_t && DECL_LOOPING_CONST_OR_PURE_P (callee_t)) |
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360 local->looping = true; |
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361 if (dump_file) |
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362 fprintf (dump_file, " pure function call in not const\n"); |
| 0 | 363 if (local->pure_const_state == IPA_CONST) |
| 364 local->pure_const_state = IPA_PURE; | |
| 365 } | |
|
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366 else |
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367 { |
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368 if (dump_file) |
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369 fprintf (dump_file, " uknown function call is not const/pure\n"); |
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370 local->pure_const_state = IPA_NEITHER; |
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371 local->looping = true; |
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372 } |
| 0 | 373 } |
|
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374 /* Direct functions calls are handled by IPA propagation. */ |
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375 } |
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376 |
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377 /* Wrapper around check_decl for loads. */ |
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378 |
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379 static bool |
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380 check_load (gimple stmt ATTRIBUTE_UNUSED, tree op, void *data) |
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381 { |
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382 if (DECL_P (op)) |
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383 check_decl ((funct_state)data, op, false); |
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384 else |
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385 check_op ((funct_state)data, op, false); |
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386 return false; |
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387 } |
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388 |
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389 /* Wrapper around check_decl for stores. */ |
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390 |
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391 static bool |
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392 check_store (gimple stmt ATTRIBUTE_UNUSED, tree op, void *data) |
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393 { |
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394 if (DECL_P (op)) |
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395 check_decl ((funct_state)data, op, true); |
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396 else |
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397 check_op ((funct_state)data, op, true); |
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398 return false; |
| 0 | 399 } |
| 400 | |
|
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401 /* Look into pointer pointed to by GSIP and figure out what interesting side |
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402 effects it has. */ |
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403 static void |
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404 check_stmt (gimple_stmt_iterator *gsip, funct_state local, bool ipa) |
| 0 | 405 { |
|
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406 gimple stmt = gsi_stmt (*gsip); |
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407 unsigned int i = 0; |
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408 |
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409 if (is_gimple_debug (stmt)) |
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410 return; |
| 0 | 411 |
|
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412 if (dump_file) |
| 0 | 413 { |
|
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414 fprintf (dump_file, " scanning: "); |
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415 print_gimple_stmt (dump_file, stmt, 0, 0); |
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416 } |
| 0 | 417 |
|
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418 /* Look for loads and stores. */ |
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419 walk_stmt_load_store_ops (stmt, local, check_load, check_store); |
| 0 | 420 |
|
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421 if (gimple_code (stmt) != GIMPLE_CALL |
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422 && stmt_could_throw_p (stmt)) |
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423 { |
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424 if (flag_non_call_exceptions) |
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425 { |
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426 if (dump_file) |
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427 fprintf (dump_file, " can throw; looping"); |
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428 local->looping = true; |
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429 } |
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430 if (stmt_can_throw_external (stmt)) |
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431 { |
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432 if (dump_file) |
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433 fprintf (dump_file, " can throw externally"); |
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434 local->can_throw = true; |
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435 } |
| 0 | 436 } |
| 437 switch (gimple_code (stmt)) | |
| 438 { | |
|
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439 case GIMPLE_CALL: |
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440 check_call (local, stmt, ipa); |
| 0 | 441 break; |
| 442 case GIMPLE_LABEL: | |
| 443 if (DECL_NONLOCAL (gimple_label_label (stmt))) | |
| 444 /* Target of long jump. */ | |
| 445 { | |
|
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446 if (dump_file) |
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447 fprintf (dump_file, " nonlocal label is not const/pure"); |
| 0 | 448 local->pure_const_state = IPA_NEITHER; |
| 449 } | |
| 450 break; | |
| 451 case GIMPLE_ASM: | |
|
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452 for (i = 0; i < gimple_asm_nclobbers (stmt); i++) |
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453 { |
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454 tree op = gimple_asm_clobber_op (stmt, i); |
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455 if (simple_cst_equal(TREE_VALUE (op), memory_identifier_string) == 1) |
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456 { |
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457 if (dump_file) |
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458 fprintf (dump_file, " memory asm clobber is not const/pure"); |
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459 /* Abandon all hope, ye who enter here. */ |
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460 local->pure_const_state = IPA_NEITHER; |
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461 } |
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462 } |
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463 if (gimple_asm_volatile_p (stmt)) |
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464 { |
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465 if (dump_file) |
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466 fprintf (dump_file, " volatile is not const/pure"); |
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467 /* Abandon all hope, ye who enter here. */ |
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468 local->pure_const_state = IPA_NEITHER; |
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469 local->looping = true; |
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470 } |
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471 return; |
| 0 | 472 default: |
| 473 break; | |
| 474 } | |
| 475 } | |
| 476 | |
| 477 | |
| 478 /* This is the main routine for finding the reference patterns for | |
| 479 global variables within a function FN. */ | |
| 480 | |
|
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481 static funct_state |
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482 analyze_function (struct cgraph_node *fn, bool ipa) |
| 0 | 483 { |
| 484 tree decl = fn->decl; | |
|
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485 tree old_decl = current_function_decl; |
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486 funct_state l; |
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487 basic_block this_block; |
| 0 | 488 |
|
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489 l = XCNEW (struct funct_state_d); |
| 0 | 490 l->pure_const_state = IPA_CONST; |
|
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491 l->state_previously_known = IPA_NEITHER; |
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492 l->looping_previously_known = true; |
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493 l->looping = false; |
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494 l->can_throw = false; |
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495 |
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496 if (dump_file) |
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497 { |
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498 fprintf (dump_file, "\n\n local analysis of %s\n ", |
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499 cgraph_node_name (fn)); |
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500 } |
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501 |
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502 push_cfun (DECL_STRUCT_FUNCTION (decl)); |
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503 current_function_decl = decl; |
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504 |
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505 FOR_EACH_BB (this_block) |
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506 { |
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507 gimple_stmt_iterator gsi; |
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508 struct walk_stmt_info wi; |
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509 |
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510 memset (&wi, 0, sizeof(wi)); |
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511 for (gsi = gsi_start_bb (this_block); |
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512 !gsi_end_p (gsi); |
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513 gsi_next (&gsi)) |
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514 { |
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515 check_stmt (&gsi, l, ipa); |
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516 if (l->pure_const_state == IPA_NEITHER && l->looping && l->can_throw) |
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517 goto end; |
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518 } |
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519 } |
| 0 | 520 |
|
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521 end: |
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522 if (l->pure_const_state != IPA_NEITHER) |
| 0 | 523 { |
|
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524 /* Const functions cannot have back edges (an |
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525 indication of possible infinite loop side |
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526 effect. */ |
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527 if (mark_dfs_back_edges ()) |
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528 { |
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529 /* Preheaders are needed for SCEV to work. |
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530 Simple lateches and recorded exits improve chances that loop will |
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531 proved to be finite in testcases such as in loop-15.c and loop-24.c */ |
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532 loop_optimizer_init (LOOPS_NORMAL |
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533 | LOOPS_HAVE_RECORDED_EXITS); |
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534 if (dump_file && (dump_flags & TDF_DETAILS)) |
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535 flow_loops_dump (dump_file, NULL, 0); |
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536 if (mark_irreducible_loops ()) |
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537 { |
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538 if (dump_file) |
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539 fprintf (dump_file, " has irreducible loops\n"); |
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540 l->looping = true; |
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541 } |
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542 else |
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543 { |
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544 loop_iterator li; |
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545 struct loop *loop; |
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546 scev_initialize (); |
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547 FOR_EACH_LOOP (li, loop, 0) |
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548 if (!finite_loop_p (loop)) |
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549 { |
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550 if (dump_file) |
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551 fprintf (dump_file, " can not prove finiteness of loop %i\n", loop->num); |
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552 l->looping =true; |
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553 break; |
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554 } |
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555 scev_finalize (); |
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556 } |
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557 loop_optimizer_finalize (); |
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558 } |
| 0 | 559 } |
| 560 | |
| 561 if (TREE_READONLY (decl)) | |
| 562 { | |
| 563 l->pure_const_state = IPA_CONST; | |
|
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564 l->state_previously_known = IPA_CONST; |
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565 if (!DECL_LOOPING_CONST_OR_PURE_P (decl)) |
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566 l->looping = false, l->looping_previously_known = false; |
| 0 | 567 } |
| 568 if (DECL_PURE_P (decl)) | |
| 569 { | |
|
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570 if (l->pure_const_state != IPA_CONST) |
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571 l->pure_const_state = IPA_PURE; |
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572 l->state_previously_known = IPA_PURE; |
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573 if (!DECL_LOOPING_CONST_OR_PURE_P (decl)) |
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574 l->looping = false, l->looping_previously_known = false; |
| 0 | 575 } |
|
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576 if (TREE_NOTHROW (decl)) |
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577 l->can_throw = false; |
| 0 | 578 |
|
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579 pop_cfun (); |
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580 current_function_decl = old_decl; |
| 0 | 581 if (dump_file) |
| 582 { | |
|
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583 if (l->looping) |
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584 fprintf (dump_file, "Function is locally looping.\n"); |
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585 if (l->can_throw) |
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586 fprintf (dump_file, "Function is locally throwing.\n"); |
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587 if (l->pure_const_state == IPA_CONST) |
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588 fprintf (dump_file, "Function is locally const.\n"); |
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589 if (l->pure_const_state == IPA_PURE) |
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590 fprintf (dump_file, "Function is locally pure.\n"); |
| 0 | 591 } |
|
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592 return l; |
| 0 | 593 } |
| 594 | |
| 595 /* Called when new function is inserted to callgraph late. */ | |
| 596 static void | |
| 597 add_new_function (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED) | |
| 598 { | |
|
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599 if (cgraph_function_body_availability (node) < AVAIL_OVERWRITABLE) |
| 0 | 600 return; |
| 601 /* There are some shared nodes, in particular the initializers on | |
| 602 static declarations. We do not need to scan them more than once | |
| 603 since all we would be interested in are the addressof | |
| 604 operations. */ | |
| 605 visited_nodes = pointer_set_create (); | |
|
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606 set_function_state (node, analyze_function (node, true)); |
| 0 | 607 pointer_set_destroy (visited_nodes); |
| 608 visited_nodes = NULL; | |
| 609 } | |
| 610 | |
| 611 /* Called when new clone is inserted to callgraph late. */ | |
| 612 | |
| 613 static void | |
| 614 duplicate_node_data (struct cgraph_node *src, struct cgraph_node *dst, | |
| 615 void *data ATTRIBUTE_UNUSED) | |
| 616 { | |
| 617 if (get_function_state (src)) | |
| 618 { | |
| 619 funct_state l = XNEW (struct funct_state_d); | |
| 620 gcc_assert (!get_function_state (dst)); | |
| 621 memcpy (l, get_function_state (src), sizeof (*l)); | |
| 622 set_function_state (dst, l); | |
| 623 } | |
| 624 } | |
| 625 | |
| 626 /* Called when new clone is inserted to callgraph late. */ | |
| 627 | |
| 628 static void | |
| 629 remove_node_data (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED) | |
| 630 { | |
| 631 if (get_function_state (node)) | |
| 632 { | |
| 633 free (get_function_state (node)); | |
| 634 set_function_state (node, NULL); | |
| 635 } | |
| 636 } | |
| 637 | |
| 638 | |
|
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639 static void |
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640 register_hooks (void) |
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641 { |
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642 static bool init_p = false; |
| 0 | 643 |
|
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644 if (init_p) |
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645 return; |
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646 |
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647 init_p = true; |
| 0 | 648 |
| 649 node_removal_hook_holder = | |
| 650 cgraph_add_node_removal_hook (&remove_node_data, NULL); | |
| 651 node_duplication_hook_holder = | |
| 652 cgraph_add_node_duplication_hook (&duplicate_node_data, NULL); | |
| 653 function_insertion_hook_holder = | |
| 654 cgraph_add_function_insertion_hook (&add_new_function, NULL); | |
|
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655 } |
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656 |
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657 |
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658 /* Analyze each function in the cgraph to see if it is locally PURE or |
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659 CONST. */ |
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660 |
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661 static void |
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662 generate_summary (void) |
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663 { |
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664 struct cgraph_node *node; |
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665 |
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666 register_hooks (); |
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667 |
| 0 | 668 /* There are some shared nodes, in particular the initializers on |
| 669 static declarations. We do not need to scan them more than once | |
| 670 since all we would be interested in are the addressof | |
| 671 operations. */ | |
| 672 visited_nodes = pointer_set_create (); | |
| 673 | |
|
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674 /* Process all of the functions. |
| 0 | 675 |
|
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676 We process AVAIL_OVERWRITABLE functions. We can not use the results |
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677 by default, but the info can be used at LTO with -fwhole-program or |
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678 when function got clonned and the clone is AVAILABLE. */ |
|
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679 |
| 0 | 680 for (node = cgraph_nodes; node; node = node->next) |
|
55
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681 if (cgraph_function_body_availability (node) >= AVAIL_OVERWRITABLE) |
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682 set_function_state (node, analyze_function (node, true)); |
| 0 | 683 |
| 684 pointer_set_destroy (visited_nodes); | |
| 685 visited_nodes = NULL; | |
| 686 } | |
| 687 | |
|
55
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688 |
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689 /* Serialize the ipa info for lto. */ |
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690 |
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691 static void |
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692 pure_const_write_summary (cgraph_node_set set) |
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693 { |
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694 struct cgraph_node *node; |
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695 struct lto_simple_output_block *ob |
|
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696 = lto_create_simple_output_block (LTO_section_ipa_pure_const); |
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697 unsigned int count = 0; |
|
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698 cgraph_node_set_iterator csi; |
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699 |
|
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700 for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi)) |
|
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701 { |
|
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702 node = csi_node (csi); |
|
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|
703 if (node->analyzed && get_function_state (node) != NULL) |
|
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704 count++; |
|
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705 } |
|
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|
706 |
|
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|
707 lto_output_uleb128_stream (ob->main_stream, count); |
|
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708 |
|
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|
709 /* Process all of the functions. */ |
|
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710 for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi)) |
|
77e2b8dfacca
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|
711 { |
|
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|
712 node = csi_node (csi); |
|
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|
713 if (node->analyzed && get_function_state (node) != NULL) |
|
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714 { |
|
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|
715 struct bitpack_d *bp; |
|
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716 funct_state fs; |
|
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717 int node_ref; |
|
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diff
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|
718 lto_cgraph_encoder_t encoder; |
|
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|
719 |
|
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|
720 fs = get_function_state (node); |
|
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|
721 |
|
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|
722 encoder = ob->decl_state->cgraph_node_encoder; |
|
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|
723 node_ref = lto_cgraph_encoder_encode (encoder, node); |
|
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|
724 lto_output_uleb128_stream (ob->main_stream, node_ref); |
|
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|
725 |
|
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diff
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|
726 /* Note that flags will need to be read in the opposite |
|
77e2b8dfacca
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|
727 order as we are pushing the bitflags into FLAGS. */ |
|
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|
728 bp = bitpack_create (); |
|
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|
729 bp_pack_value (bp, fs->pure_const_state, 2); |
|
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|
730 bp_pack_value (bp, fs->state_previously_known, 2); |
|
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diff
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|
731 bp_pack_value (bp, fs->looping_previously_known, 1); |
|
77e2b8dfacca
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changeset
|
732 bp_pack_value (bp, fs->looping, 1); |
|
77e2b8dfacca
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parents:
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diff
changeset
|
733 bp_pack_value (bp, fs->can_throw, 1); |
|
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parents:
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|
734 lto_output_bitpack (ob->main_stream, bp); |
|
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parents:
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diff
changeset
|
735 bitpack_delete (bp); |
|
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parents:
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diff
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|
736 } |
|
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|
737 } |
|
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diff
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|
738 |
|
77e2b8dfacca
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|
739 lto_destroy_simple_output_block (ob); |
|
77e2b8dfacca
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|
740 } |
|
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|
741 |
|
77e2b8dfacca
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diff
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|
742 |
|
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parents:
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diff
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|
743 /* Deserialize the ipa info for lto. */ |
|
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diff
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|
744 |
|
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|
745 static void |
|
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|
746 pure_const_read_summary (void) |
|
77e2b8dfacca
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diff
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|
747 { |
|
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diff
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|
748 struct lto_file_decl_data **file_data_vec = lto_get_file_decl_data (); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
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|
749 struct lto_file_decl_data *file_data; |
|
77e2b8dfacca
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diff
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|
750 unsigned int j = 0; |
|
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diff
changeset
|
751 |
|
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diff
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|
752 register_hooks (); |
|
77e2b8dfacca
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diff
changeset
|
753 while ((file_data = file_data_vec[j++])) |
|
77e2b8dfacca
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diff
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|
754 { |
|
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|
755 const char *data; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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diff
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|
756 size_t len; |
|
77e2b8dfacca
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parents:
0
diff
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|
757 struct lto_input_block *ib |
|
77e2b8dfacca
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diff
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|
758 = lto_create_simple_input_block (file_data, |
|
77e2b8dfacca
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diff
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|
759 LTO_section_ipa_pure_const, |
|
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diff
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|
760 &data, &len); |
|
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parents:
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|
761 if (ib) |
|
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|
762 { |
|
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parents:
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|
763 unsigned int i; |
|
77e2b8dfacca
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parents:
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diff
changeset
|
764 unsigned int count = lto_input_uleb128 (ib); |
|
77e2b8dfacca
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parents:
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|
765 |
|
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parents:
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diff
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|
766 for (i = 0; i < count; i++) |
|
77e2b8dfacca
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|
767 { |
|
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|
768 unsigned int index; |
|
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|
769 struct cgraph_node *node; |
|
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|
770 struct bitpack_d *bp; |
|
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771 funct_state fs; |
|
77e2b8dfacca
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diff
changeset
|
772 lto_cgraph_encoder_t encoder; |
|
77e2b8dfacca
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diff
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|
773 |
|
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parents:
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changeset
|
774 fs = XCNEW (struct funct_state_d); |
|
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changeset
|
775 index = lto_input_uleb128 (ib); |
|
77e2b8dfacca
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parents:
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changeset
|
776 encoder = file_data->cgraph_node_encoder; |
|
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|
777 node = lto_cgraph_encoder_deref (encoder, index); |
|
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diff
changeset
|
778 set_function_state (node, fs); |
|
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changeset
|
779 |
|
77e2b8dfacca
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diff
changeset
|
780 /* Note that the flags must be read in the opposite |
|
77e2b8dfacca
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diff
changeset
|
781 order in which they were written (the bitflags were |
|
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|
782 pushed into FLAGS). */ |
|
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update it from 4.4.3 to 4.5.0
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changeset
|
783 bp = lto_input_bitpack (ib); |
|
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parents:
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diff
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|
784 fs->pure_const_state |
|
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|
785 = (enum pure_const_state_e) bp_unpack_value (bp, 2); |
|
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786 fs->state_previously_known |
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787 = (enum pure_const_state_e) bp_unpack_value (bp, 2); |
|
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788 fs->looping_previously_known = bp_unpack_value (bp, 1); |
|
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789 fs->looping = bp_unpack_value (bp, 1); |
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790 fs->can_throw = bp_unpack_value (bp, 1); |
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791 bitpack_delete (bp); |
|
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792 } |
|
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793 |
|
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|
794 lto_destroy_simple_input_block (file_data, |
|
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795 LTO_section_ipa_pure_const, |
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796 ib, data, len); |
|
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797 } |
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798 } |
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799 } |
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800 |
|
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801 |
|
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802 static bool |
|
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803 ignore_edge (struct cgraph_edge *e) |
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804 { |
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805 return (!e->can_throw_external); |
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806 } |
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807 |
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808 /* Return true if NODE is self recursive function. */ |
|
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809 |
|
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810 static bool |
|
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|
811 self_recursive_p (struct cgraph_node *node) |
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812 { |
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813 struct cgraph_edge *e; |
|
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814 for (e = node->callees; e; e = e->next_callee) |
|
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815 if (e->callee == node) |
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816 return true; |
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817 return false; |
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818 } |
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819 |
| 0 | 820 /* Produce the global information by preforming a transitive closure |
| 821 on the local information that was produced by generate_summary. | |
| 822 Note that there is no function_transform pass since this only | |
| 823 updates the function_decl. */ | |
| 824 | |
| 825 static unsigned int | |
| 826 propagate (void) | |
| 827 { | |
| 828 struct cgraph_node *node; | |
| 829 struct cgraph_node *w; | |
| 830 struct cgraph_node **order = | |
| 831 XCNEWVEC (struct cgraph_node *, cgraph_n_nodes); | |
| 832 int order_pos; | |
| 833 int i; | |
| 834 struct ipa_dfs_info * w_info; | |
| 835 | |
| 836 cgraph_remove_function_insertion_hook (function_insertion_hook_holder); | |
| 837 cgraph_remove_node_duplication_hook (node_duplication_hook_holder); | |
| 838 cgraph_remove_node_removal_hook (node_removal_hook_holder); | |
|
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839 order_pos = ipa_utils_reduced_inorder (order, true, false, NULL); |
| 0 | 840 if (dump_file) |
| 841 { | |
| 842 dump_cgraph (dump_file); | |
| 843 ipa_utils_print_order(dump_file, "reduced", order, order_pos); | |
| 844 } | |
| 845 | |
| 846 /* Propagate the local information thru the call graph to produce | |
| 847 the global information. All the nodes within a cycle will have | |
| 848 the same info so we collapse cycles first. Then we can do the | |
| 849 propagation in one pass from the leaves to the roots. */ | |
| 850 for (i = 0; i < order_pos; i++ ) | |
| 851 { | |
| 852 enum pure_const_state_e pure_const_state = IPA_CONST; | |
| 853 bool looping = false; | |
| 854 int count = 0; | |
| 855 node = order[i]; | |
| 856 | |
| 857 /* Find the worst state for any node in the cycle. */ | |
| 858 w = node; | |
| 859 while (w) | |
| 860 { | |
|
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861 struct cgraph_edge *e; |
| 0 | 862 funct_state w_l = get_function_state (w); |
| 863 if (pure_const_state < w_l->pure_const_state) | |
| 864 pure_const_state = w_l->pure_const_state; | |
| 865 | |
| 866 if (w_l->looping) | |
| 867 looping = true; | |
|
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868 if (cgraph_function_body_availability (w) == AVAIL_OVERWRITABLE) |
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869 { |
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870 looping |= w_l->looping_previously_known; |
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871 if (pure_const_state < w_l->state_previously_known) |
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872 pure_const_state = w_l->state_previously_known; |
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873 } |
| 0 | 874 |
|
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875 if (pure_const_state == IPA_NEITHER) |
| 0 | 876 break; |
| 877 | |
|
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878 count++; |
|
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879 |
|
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880 if (count > 1) |
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881 looping = true; |
| 0 | 882 |
|
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883 for (e = w->callees; e; e = e->next_callee) |
|
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884 { |
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885 struct cgraph_node *y = e->callee; |
|
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|
886 |
|
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887 if (cgraph_function_body_availability (y) > AVAIL_OVERWRITABLE) |
| 0 | 888 { |
|
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|
889 funct_state y_l = get_function_state (y); |
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890 if (pure_const_state < y_l->pure_const_state) |
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|
891 pure_const_state = y_l->pure_const_state; |
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892 if (pure_const_state == IPA_NEITHER) |
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|
893 break; |
|
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|
894 if (y_l->looping) |
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|
895 looping = true; |
|
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896 } |
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|
897 else |
|
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898 { |
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899 int flags = flags_from_decl_or_type (y->decl); |
| 0 | 900 |
|
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901 if (flags & ECF_LOOPING_CONST_OR_PURE) |
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902 looping = true; |
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903 if (flags & ECF_CONST) |
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904 ; |
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905 else if ((flags & ECF_PURE) && pure_const_state == IPA_CONST) |
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906 pure_const_state = IPA_PURE; |
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907 else |
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908 pure_const_state = IPA_NEITHER, looping = true; |
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909 |
| 0 | 910 } |
| 911 } | |
| 912 w_info = (struct ipa_dfs_info *) w->aux; | |
| 913 w = w_info->next_cycle; | |
| 914 } | |
| 915 | |
| 916 /* Copy back the region's pure_const_state which is shared by | |
| 917 all nodes in the region. */ | |
| 918 w = node; | |
| 919 while (w) | |
| 920 { | |
| 921 funct_state w_l = get_function_state (w); | |
|
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922 enum pure_const_state_e this_state = pure_const_state; |
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923 bool this_looping = looping; |
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924 |
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925 if (w_l->state_previously_known != IPA_NEITHER |
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926 && this_state > w_l->state_previously_known) |
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927 this_state = w_l->state_previously_known; |
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928 if (!this_looping && self_recursive_p (w)) |
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929 this_looping = true; |
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930 if (!w_l->looping_previously_known) |
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931 this_looping = false; |
| 0 | 932 |
| 933 /* All nodes within a cycle share the same info. */ | |
|
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934 w_l->pure_const_state = this_state; |
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935 w_l->looping = this_looping; |
| 0 | 936 |
|
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937 switch (this_state) |
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938 { |
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939 case IPA_CONST: |
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940 if (!TREE_READONLY (w->decl) && dump_file) |
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|
941 fprintf (dump_file, "Function found to be %sconst: %s\n", |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
942 this_looping ? "looping " : "", |
|
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parents:
0
diff
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|
943 cgraph_node_name (w)); |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
944 cgraph_set_readonly_flag (w, true); |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
945 cgraph_set_looping_const_or_pure_flag (w, this_looping); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
946 break; |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
947 |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
948 case IPA_PURE: |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
949 if (!DECL_PURE_P (w->decl) && dump_file) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
950 fprintf (dump_file, "Function found to be %spure: %s\n", |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
951 this_looping ? "looping " : "", |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
952 cgraph_node_name (w)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
953 cgraph_set_pure_flag (w, true); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
954 cgraph_set_looping_const_or_pure_flag (w, this_looping); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
955 break; |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
956 |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
957 default: |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
958 break; |
| 0 | 959 } |
| 960 w_info = (struct ipa_dfs_info *) w->aux; | |
| 961 w = w_info->next_cycle; | |
| 962 } | |
| 963 } | |
| 964 | |
| 965 /* Cleanup. */ | |
| 966 for (node = cgraph_nodes; node; node = node->next) | |
| 967 { | |
| 968 /* Get rid of the aux information. */ | |
| 969 if (node->aux) | |
| 970 { | |
| 971 w_info = (struct ipa_dfs_info *) node->aux; | |
| 972 free (node->aux); | |
| 973 node->aux = NULL; | |
| 974 } | |
|
55
77e2b8dfacca
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parents:
0
diff
changeset
|
975 } |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
976 order_pos = ipa_utils_reduced_inorder (order, true, false, ignore_edge); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
977 if (dump_file) |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
978 { |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
979 dump_cgraph (dump_file); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
980 ipa_utils_print_order(dump_file, "reduced for nothrow", order, order_pos); |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
981 } |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
982 /* Propagate the local information thru the call graph to produce |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
983 the global information. All the nodes within a cycle will have |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
984 the same info so we collapse cycles first. Then we can do the |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
985 propagation in one pass from the leaves to the roots. */ |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
986 for (i = 0; i < order_pos; i++ ) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
987 { |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
988 bool can_throw = false; |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
989 node = order[i]; |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
990 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
991 /* Find the worst state for any node in the cycle. */ |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
992 w = node; |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
993 while (w) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
994 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
995 struct cgraph_edge *e; |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
996 funct_state w_l = get_function_state (w); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
997 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
998 if (w_l->can_throw |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
999 || cgraph_function_body_availability (w) == AVAIL_OVERWRITABLE) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1000 can_throw = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1001 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1002 if (can_throw) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1003 break; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1004 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1005 for (e = w->callees; e; e = e->next_callee) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1006 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1007 struct cgraph_node *y = e->callee; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1008 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1009 if (cgraph_function_body_availability (y) > AVAIL_OVERWRITABLE) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1010 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1011 funct_state y_l = get_function_state (y); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1012 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1013 if (can_throw) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1014 break; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1015 if (y_l->can_throw && !TREE_NOTHROW (w->decl) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1016 && e->can_throw_external) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1017 can_throw = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1018 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1019 else if (e->can_throw_external && !TREE_NOTHROW (y->decl)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1020 can_throw = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1021 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1022 w_info = (struct ipa_dfs_info *) w->aux; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1023 w = w_info->next_cycle; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1024 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1025 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1026 /* Copy back the region's pure_const_state which is shared by |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1027 all nodes in the region. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1028 w = node; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1029 while (w) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1030 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1031 funct_state w_l = get_function_state (w); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1032 if (!can_throw && !TREE_NOTHROW (w->decl)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1033 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1034 struct cgraph_edge *e; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1035 cgraph_set_nothrow_flag (w, true); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1036 for (e = w->callers; e; e = e->next_caller) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1037 e->can_throw_external = false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1038 if (dump_file) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1039 fprintf (dump_file, "Function found to be nothrow: %s\n", |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1040 cgraph_node_name (w)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1041 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1042 else if (can_throw && !TREE_NOTHROW (w->decl)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1043 w_l->can_throw = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1044 w_info = (struct ipa_dfs_info *) w->aux; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1045 w = w_info->next_cycle; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1046 } |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1047 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1048 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1049 /* Cleanup. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1050 for (node = cgraph_nodes; node; node = node->next) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1051 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1052 /* Get rid of the aux information. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1053 if (node->aux) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1054 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1055 w_info = (struct ipa_dfs_info *) node->aux; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
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|
1056 free (node->aux); |
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1057 node->aux = NULL; |
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1058 } |
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1059 if (cgraph_function_body_availability (node) >= AVAIL_OVERWRITABLE) |
| 0 | 1060 free (get_function_state (node)); |
| 1061 } | |
|
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1062 |
| 0 | 1063 free (order); |
| 1064 VEC_free (funct_state, heap, funct_state_vec); | |
| 1065 finish_state (); | |
| 1066 return 0; | |
| 1067 } | |
| 1068 | |
| 1069 static bool | |
| 1070 gate_pure_const (void) | |
| 1071 { | |
| 1072 return (flag_ipa_pure_const | |
| 1073 /* Don't bother doing anything if the program has errors. */ | |
| 1074 && !(errorcount || sorrycount)); | |
| 1075 } | |
| 1076 | |
|
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1077 struct ipa_opt_pass_d pass_ipa_pure_const = |
| 0 | 1078 { |
| 1079 { | |
| 1080 IPA_PASS, | |
| 1081 "pure-const", /* name */ | |
| 1082 gate_pure_const, /* gate */ | |
| 1083 propagate, /* execute */ | |
| 1084 NULL, /* sub */ | |
| 1085 NULL, /* next */ | |
| 1086 0, /* static_pass_number */ | |
| 1087 TV_IPA_PURE_CONST, /* tv_id */ | |
| 1088 0, /* properties_required */ | |
| 1089 0, /* properties_provided */ | |
| 1090 0, /* properties_destroyed */ | |
| 1091 0, /* todo_flags_start */ | |
| 1092 0 /* todo_flags_finish */ | |
| 1093 }, | |
| 1094 generate_summary, /* generate_summary */ | |
|
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1095 pure_const_write_summary, /* write_summary */ |
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1096 pure_const_read_summary, /* read_summary */ |
| 0 | 1097 NULL, /* function_read_summary */ |
|
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1098 NULL, /* stmt_fixup */ |
| 0 | 1099 0, /* TODOs */ |
| 1100 NULL, /* function_transform */ | |
| 1101 NULL /* variable_transform */ | |
| 1102 }; | |
|
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1103 |
|
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1104 /* Simple local pass for pure const discovery reusing the analysis from |
|
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1105 ipa_pure_const. This pass is effective when executed together with |
|
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1106 other optimization passes in early optimization pass queue. */ |
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1107 |
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1108 static unsigned int |
|
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1109 local_pure_const (void) |
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1110 { |
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1111 bool changed = false; |
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1112 funct_state l; |
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1113 struct cgraph_node *node; |
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1114 |
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1115 /* Because we do not schedule pass_fixup_cfg over whole program after early optimizations |
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1116 we must not promote functions that are called by already processed functions. */ |
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1117 |
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1118 if (function_called_by_processed_nodes_p ()) |
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1119 { |
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1120 if (dump_file) |
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1121 fprintf (dump_file, "Function called in recursive cycle; ignoring\n"); |
|
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1122 return 0; |
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1123 } |
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1124 node = cgraph_node (current_function_decl); |
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1125 if (cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE) |
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1126 { |
|
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1127 if (dump_file) |
|
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1128 fprintf (dump_file, "Function has wrong visibility; ignoring\n"); |
|
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1129 return 0; |
|
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1130 } |
|
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1131 |
|
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1132 l = analyze_function (node, false); |
|
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1133 |
|
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|
1134 switch (l->pure_const_state) |
|
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1135 { |
|
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1136 case IPA_CONST: |
|
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1137 if (!TREE_READONLY (current_function_decl)) |
|
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1138 { |
|
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1139 cgraph_set_readonly_flag (node, true); |
|
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1140 cgraph_set_looping_const_or_pure_flag (node, l->looping); |
|
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1141 changed = true; |
|
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1142 if (dump_file) |
|
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1143 fprintf (dump_file, "Function found to be %sconst: %s\n", |
|
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1144 l->looping ? "looping " : "", |
|
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1145 lang_hooks.decl_printable_name (current_function_decl, |
|
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1146 2)); |
|
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1147 } |
|
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|
1148 else if (DECL_LOOPING_CONST_OR_PURE_P (current_function_decl) |
|
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|
1149 && !l->looping) |
|
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|
1150 { |
|
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|
1151 cgraph_set_looping_const_or_pure_flag (node, false); |
|
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|
1152 changed = true; |
|
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1153 if (dump_file) |
|
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1154 fprintf (dump_file, "Function found to be non-looping: %s\n", |
|
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|
1155 lang_hooks.decl_printable_name (current_function_decl, |
|
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|
1156 2)); |
|
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1157 } |
|
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|
1158 break; |
|
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1159 |
|
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|
1160 case IPA_PURE: |
|
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|
1161 if (!TREE_READONLY (current_function_decl)) |
|
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1162 { |
|
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|
1163 cgraph_set_pure_flag (node, true); |
|
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|
1164 cgraph_set_looping_const_or_pure_flag (node, l->looping); |
|
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1165 changed = true; |
|
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|
1166 if (dump_file) |
|
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1167 fprintf (dump_file, "Function found to be %spure: %s\n", |
|
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1168 l->looping ? "looping " : "", |
|
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1169 lang_hooks.decl_printable_name (current_function_decl, |
|
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|
1170 2)); |
|
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1171 } |
|
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|
1172 else if (DECL_LOOPING_CONST_OR_PURE_P (current_function_decl) |
|
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1173 && !l->looping) |
|
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1174 { |
|
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1175 cgraph_set_looping_const_or_pure_flag (node, false); |
|
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1176 changed = true; |
|
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1177 if (dump_file) |
|
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1178 fprintf (dump_file, "Function found to be non-looping: %s\n", |
|
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|
1179 lang_hooks.decl_printable_name (current_function_decl, |
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|
1180 2)); |
|
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1181 } |
|
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|
1182 break; |
|
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1183 |
|
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|
1184 default: |
|
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|
1185 break; |
|
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1186 } |
|
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1187 if (!l->can_throw && !TREE_NOTHROW (current_function_decl)) |
|
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1188 { |
|
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|
1189 struct cgraph_edge *e; |
|
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1190 |
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1191 cgraph_set_nothrow_flag (node, true); |
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1192 for (e = node->callers; e; e = e->next_caller) |
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1193 e->can_throw_external = false; |
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1194 changed = true; |
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1195 if (dump_file) |
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1196 fprintf (dump_file, "Function found to be nothrow: %s\n", |
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1197 lang_hooks.decl_printable_name (current_function_decl, |
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1198 2)); |
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1199 } |
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1200 if (l) |
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1201 free (l); |
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1202 if (changed) |
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1203 return execute_fixup_cfg (); |
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1204 else |
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1205 return 0; |
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1206 } |
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1207 |
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1208 struct gimple_opt_pass pass_local_pure_const = |
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1209 { |
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1210 { |
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1211 GIMPLE_PASS, |
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1212 "local-pure-const", /* name */ |
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1213 gate_pure_const, /* gate */ |
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1214 local_pure_const, /* execute */ |
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1215 NULL, /* sub */ |
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1216 NULL, /* next */ |
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1217 0, /* static_pass_number */ |
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1218 TV_IPA_PURE_CONST, /* tv_id */ |
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1219 0, /* properties_required */ |
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1220 0, /* properties_provided */ |
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1221 0, /* properties_destroyed */ |
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1222 0, /* todo_flags_start */ |
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1223 0 /* todo_flags_finish */ |
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1224 } |
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1225 }; |