gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2014 Free Software Foundation, Inc.
   3    Contributed by Dmitry Vyukov <dvyukov@google.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
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tree.h"
  26 #include "expr.h"
  27 #include "intl.h"
  28 #include "tm.h"
  29 #include "predict.h"
  30 #include "vec.h"
  31 #include "hashtab.h"
  32 #include "hash-set.h"
  33 #include "machmode.h"
  34 #include "hard-reg-set.h"
  35 #include "input.h"
  36 #include "function.h"
  37 #include "dominance.h"
  38 #include "cfg.h"
  39 #include "basic-block.h"
  40 #include "tree-ssa-alias.h"
  41 #include "internal-fn.h"
  42 #include "gimple-expr.h"
  43 #include "is-a.h"
  44 #include "gimple.h"
  45 #include "gimplify.h"
  46 #include "gimple-iterator.h"
  47 #include "gimple-ssa.h"
  48 #include "hash-map.h"
  49 #include "plugin-api.h"
  50 #include "ipa-ref.h"
  51 #include "cgraph.h"
  52 #include "tree-cfg.h"
  53 #include "stringpool.h"
  54 #include "tree-ssanames.h"
  55 #include "tree-pass.h"
  56 #include "tree-iterator.h"
  57 #include "langhooks.h"
  58 #include "output.h"
  59 #include "options.h"
  60 #include "target.h"
  61 #include "diagnostic.h"
  62 #include "tree-ssa-propagate.h"
  63 #include "tsan.h"
  64 #include "asan.h"
  65
  66 /* Number of instrumented memory accesses in the current function.  */
  67
  68 /* Builds the following decl
  69    void __tsan_read/writeX (void *addr);  */
  70
  71 static tree
  72 get_memory_access_decl (bool is_write, unsigned size)
  73 {
  74   enum built_in_function fcode;
  75
  76   if (size <= 1)
  77     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  78                      : BUILT_IN_TSAN_READ1;
  79   else if (size <= 3)
  80     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  81                      : BUILT_IN_TSAN_READ2;
  82   else if (size <= 7)
  83     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  84                      : BUILT_IN_TSAN_READ4;
  85   else if (size <= 15)
  86     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  87                      : BUILT_IN_TSAN_READ8;
  88   else
  89     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  90                      : BUILT_IN_TSAN_READ16;
  91
  92   return builtin_decl_implicit (fcode);
  93 }
  94
  95 /* Check as to whether EXPR refers to a store to vptr.  */
  96
  97 static tree
  98 is_vptr_store (gimple stmt, tree expr, bool is_write)
  99 {
 100   if (is_write == true
 101       && gimple_assign_single_p (stmt)
 102       && TREE_CODE (expr) == COMPONENT_REF)
 103     {
 104       tree field = TREE_OPERAND (expr, 1);
 105       if (TREE_CODE (field) == FIELD_DECL
 106           && DECL_VIRTUAL_P (field))
 107         return gimple_assign_rhs1 (stmt);
 108     }
 109   return NULL;
 110 }
 111
 112 /* Instruments EXPR if needed. If any instrumentation is inserted,
 113    return true.  */
 114
 115 static bool
 116 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 117 {
 118   tree base, rhs, expr_ptr, builtin_decl;
 119   basic_block bb;
 120   HOST_WIDE_INT size;
 121   gimple stmt, g;
 122   gimple_seq seq;
 123   location_t loc;
 124
 125   size = int_size_in_bytes (TREE_TYPE (expr));
 126   if (size == -1)
 127     return false;
 128
 129   /* For now just avoid instrumenting bit field acceses.
 130      TODO: handle bit-fields as if touching the whole field.  */
 131   HOST_WIDE_INT bitsize, bitpos;
 132   tree offset;
 133   machine_mode mode;
 134   int volatilep = 0, unsignedp = 0;
 135   base = get_inner_reference (expr, &bitsize, &bitpos, &offset,
 136                               &mode, &unsignedp, &volatilep, false);
 137
 138   /* No need to instrument accesses to decls that don't escape,
 139      they can't escape to other threads then.  */
 140   if (DECL_P (base))
 141     {
 142       struct pt_solution pt;
 143       memset (&pt, 0, sizeof (pt));
 144       pt.escaped = 1;
 145       pt.ipa_escaped = flag_ipa_pta != 0;
 146       pt.nonlocal = 1;
 147       if (!pt_solution_includes (&pt, base))
 148         return false;
 149       if (!is_global_var (base) && !may_be_aliased (base))
 150         return false;
 151     }
 152
 153   if (TREE_READONLY (base)
 154       || (TREE_CODE (base) == VAR_DECL
 155           && DECL_HARD_REGISTER (base)))
 156     return false;
 157
 158   if (size == 0
 159       || bitpos % (size * BITS_PER_UNIT)
 160       || bitsize != size * BITS_PER_UNIT)
 161     return false;
 162
 163   stmt = gsi_stmt (gsi);
 164   loc = gimple_location (stmt);
 165   rhs = is_vptr_store (stmt, expr, is_write);
 166   gcc_checking_assert (rhs != NULL || is_gimple_addressable (expr));
 167   expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 168   seq = NULL;
 169   if (!is_gimple_val (expr_ptr))
 170     {
 171       g = gimple_build_assign (make_ssa_name (TREE_TYPE (expr_ptr)), expr_ptr);
 172       expr_ptr = gimple_assign_lhs (g);
 173       gimple_set_location (g, loc);
 174       gimple_seq_add_stmt_without_update (&seq, g);
 175     }
 176   if (rhs == NULL)
 177     g = gimple_build_call (get_memory_access_decl (is_write, size),
 178                            1, expr_ptr);
 179   else
 180     {
 181       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 182       g = gimple_build_call (builtin_decl, 1, expr_ptr);
 183     }
 184   gimple_set_location (g, loc);
 185   gimple_seq_add_stmt_without_update (&seq, g);
 186   /* Instrumentation for assignment of a function result
 187      must be inserted after the call.  Instrumentation for
 188      reads of function arguments must be inserted before the call.
 189      That's because the call can contain synchronization.  */
 190   if (is_gimple_call (stmt) && is_write)
 191     {
 192       /* If the call can throw, it must be the last stmt in
 193          a basic block, so the instrumented stmts need to be
 194          inserted in successor bbs.  */
 195       if (is_ctrl_altering_stmt (stmt))
 196         {
 197           edge e;
 198
 199           bb = gsi_bb (gsi);
 200           e = find_fallthru_edge (bb->succs);
 201           if (e)
 202             gsi_insert_seq_on_edge_immediate (e, seq);
 203         }
 204       else
 205         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 206     }
 207   else
 208     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 209
 210   return true;
 211 }
 212
 213 /* Actions for sync/atomic builtin transformations.  */
 214 enum tsan_atomic_action
 215 {
 216   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 217   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 218 };
 219
 220 /* Table how to map sync/atomic builtins to their corresponding
 221    tsan equivalents.  */
 222 static const struct tsan_map_atomic
 223 {
 224   enum built_in_function fcode, tsan_fcode;
 225   enum tsan_atomic_action action;
 226   enum tree_code code;
 227 } tsan_atomic_table[] =
 228 {
 229 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 230   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 231 #define CHECK_LAST(fcode, tsan_fcode) \
 232   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 233 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 234   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 235 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 236   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 237 #define WEAK_CAS(fcode, tsan_fcode) \
 238   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 239 #define STRONG_CAS(fcode, tsan_fcode) \
 240   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 241 #define BOOL_CAS(fcode, tsan_fcode) \
 242   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 243 #define VAL_CAS(fcode, tsan_fcode) \
 244   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 245 #define LOCK_RELEASE(fcode, tsan_fcode) \
 246   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 247 #define FETCH_OP(fcode, tsan_fcode, code) \
 248   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 249 #define FETCH_OPS(fcode, tsan_fcode, code) \
 250   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 251
 252   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 253   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 254   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 255   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 256   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 257   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 258   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 259   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 260   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 261   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 262   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 263   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 264   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 265   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 266   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 267   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 268   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 269   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 270   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 271   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 272   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 273   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 274   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 275   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 276   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 277   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 278   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 279   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 280   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 281   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 282   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 283   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 284   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 285   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 286   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 287   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 288   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 289   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 290   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 291   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 292   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 293   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 294   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 295   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 296   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 297
 298   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 299   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 300
 301   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 302   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 303   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 304   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 305   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 306   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 307   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 308   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 309   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 310   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 311   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 312   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 313   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 314   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 315   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 316   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 317   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 318   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 319   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 320   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 321   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 322   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 323   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 324   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 325   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 326   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 327   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 328   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 329   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 330   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 331
 332   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 333   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 334   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 335   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 336   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 337
 338   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 339   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 340   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 341   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 342   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 343   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 344   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 345   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 346   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 347   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 348   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 349   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 350   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 351   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 352   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 353   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 354   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 355   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 356   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 357   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 358   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 359   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 360   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 361   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 362   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 363   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 364   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 365   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 366   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 367   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 368
 369   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 370
 371   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 372   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 373   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 374   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 375   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 376   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 377   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 378   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 379   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 380   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 381   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 382   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 383   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 384   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 385   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 386   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 387   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 388   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 389   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 390   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 391   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 392   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 393   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 394   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 395   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 396   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 397   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 398   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 399   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 400   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 401
 402   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 403   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 404   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 405   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 406   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 407
 408   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 409   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 410               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 411   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 412               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 413   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 414               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 415   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 416               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 417
 418   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 419             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 420   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 421             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 422   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 423             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 424   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 425             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 426   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 427             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 428
 429   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 430   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 431   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 432   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 433   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 434            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 435
 436   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 437   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 438   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 439   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 440   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE)
 441 };
 442
 443 /* Instrument an atomic builtin.  */
 444
 445 static void
 446 instrument_builtin_call (gimple_stmt_iterator *gsi)
 447 {
 448   gimple stmt = gsi_stmt (*gsi), g;
 449   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 450   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 451   unsigned int i, num = gimple_call_num_args (stmt), j;
 452   for (j = 0; j < 6 && j < num; j++)
 453     args[j] = gimple_call_arg (stmt, j);
 454   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 455     if (fcode != tsan_atomic_table[i].fcode)
 456       continue;
 457     else
 458       {
 459         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 460         if (decl == NULL_TREE)
 461           return;
 462         switch (tsan_atomic_table[i].action)
 463           {
 464           case check_last:
 465           case fetch_op:
 466             last_arg = gimple_call_arg (stmt, num - 1);
 467             if (!tree_fits_uhwi_p (last_arg)
 468                 || tree_to_uhwi (last_arg) > MEMMODEL_SEQ_CST)
 469               return;
 470             gimple_call_set_fndecl (stmt, decl);
 471             update_stmt (stmt);
 472             if (tsan_atomic_table[i].action == fetch_op)
 473               {
 474                 args[1] = gimple_call_arg (stmt, 1);
 475                 goto adjust_result;
 476               }
 477             return;
 478           case add_seq_cst:
 479           case add_acquire:
 480           case fetch_op_seq_cst:
 481             gcc_assert (num <= 2);
 482             for (j = 0; j < num; j++)
 483               args[j] = gimple_call_arg (stmt, j);
 484             for (; j < 2; j++)
 485               args[j] = NULL_TREE;
 486             args[num] = build_int_cst (NULL_TREE,
 487                                        tsan_atomic_table[i].action
 488                                        != add_acquire
 489                                        ? MEMMODEL_SEQ_CST
 490                                        : MEMMODEL_ACQUIRE);
 491             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 492             stmt = gsi_stmt (*gsi);
 493             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 494               {
 495               adjust_result:
 496                 lhs = gimple_call_lhs (stmt);
 497                 if (lhs == NULL_TREE)
 498                   return;
 499                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 500                                                 TREE_TYPE (args[1])))
 501                   {
 502                     tree var = make_ssa_name (TREE_TYPE (lhs));
 503                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 504                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 505                     args[1] = var;
 506                   }
 507                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 508                 /* BIT_NOT_EXPR stands for NAND.  */
 509                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 510                   {
 511                     tree var = make_ssa_name (TREE_TYPE (lhs));
 512                     g = gimple_build_assign (var, BIT_AND_EXPR,
 513                                              gimple_call_lhs (stmt), args[1]);
 514                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 515                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 516                   }
 517                 else
 518                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 519                                            gimple_call_lhs (stmt), args[1]);
 520                 update_stmt (stmt);
 521                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 522               }
 523             return;
 524           case weak_cas:
 525             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 526               continue;
 527             /* FALLTHRU */
 528           case strong_cas:
 529             gcc_assert (num == 6);
 530             for (j = 0; j < 6; j++)
 531               args[j] = gimple_call_arg (stmt, j);
 532             if (!tree_fits_uhwi_p (args[4])
 533                 || tree_to_uhwi (args[4]) > MEMMODEL_SEQ_CST)
 534               return;
 535             if (!tree_fits_uhwi_p (args[5])
 536                 || tree_to_uhwi (args[5]) > MEMMODEL_SEQ_CST)
 537               return;
 538             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 539                                 args[4], args[5]);
 540             return;
 541           case bool_cas:
 542           case val_cas:
 543             gcc_assert (num == 3);
 544             for (j = 0; j < 3; j++)
 545               args[j] = gimple_call_arg (stmt, j);
 546             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 547             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 548             t = create_tmp_var (t);
 549             mark_addressable (t);
 550             if (!useless_type_conversion_p (TREE_TYPE (t),
 551                                             TREE_TYPE (args[1])))
 552               {
 553                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 554                                          NOP_EXPR, args[1]);
 555                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 556                 args[1] = gimple_assign_lhs (g);
 557               }
 558             g = gimple_build_assign (t, args[1]);
 559             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 560             lhs = gimple_call_lhs (stmt);
 561             update_gimple_call (gsi, decl, 5, args[0],
 562                                 build_fold_addr_expr (t), args[2],
 563                                 build_int_cst (NULL_TREE,
 564                                                MEMMODEL_SEQ_CST),
 565                                 build_int_cst (NULL_TREE,
 566                                                MEMMODEL_SEQ_CST));
 567             if (tsan_atomic_table[i].action == val_cas && lhs)
 568               {
 569                 tree cond;
 570                 stmt = gsi_stmt (*gsi);
 571                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 572                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 573                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 574                 cond = build2 (NE_EXPR, boolean_type_node, t,
 575                                build_int_cst (TREE_TYPE (t), 0));
 576                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 577                                          gimple_assign_lhs (g));
 578                 gimple_call_set_lhs (stmt, t);
 579                 update_stmt (stmt);
 580                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 581               }
 582             return;
 583           case lock_release:
 584             gcc_assert (num == 1);
 585             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 586             t = TREE_VALUE (TREE_CHAIN (t));
 587             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 588                                 build_int_cst (t, 0),
 589                                 build_int_cst (NULL_TREE,
 590                                                MEMMODEL_RELEASE));
 591             return;
 592           default:
 593             continue;
 594           }
 595       }
 596 }
 597
 598 /* Instruments the gimple pointed to by GSI. Return
 599    true if func entry/exit should be instrumented.  */
 600
 601 static bool
 602 instrument_gimple (gimple_stmt_iterator *gsi)
 603 {
 604   gimple stmt;
 605   tree rhs, lhs;
 606   bool instrumented = false;
 607
 608   stmt = gsi_stmt (*gsi);
 609   if (is_gimple_call (stmt)
 610       && (gimple_call_fndecl (stmt)
 611           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 612     {
 613       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 614         instrument_builtin_call (gsi);
 615       return true;
 616     }
 617   else if (is_gimple_assign (stmt)
 618            && !gimple_clobber_p (stmt))
 619     {
 620       if (gimple_store_p (stmt))
 621         {
 622           lhs = gimple_assign_lhs (stmt);
 623           instrumented = instrument_expr (*gsi, lhs, true);
 624         }
 625       if (gimple_assign_load_p (stmt))
 626         {
 627           rhs = gimple_assign_rhs1 (stmt);
 628           instrumented = instrument_expr (*gsi, rhs, false);
 629         }
 630     }
 631   return instrumented;
 632 }
 633
 634 /* Instruments all interesting memory accesses in the current function.
 635    Return true if func entry/exit should be instrumented.  */
 636
 637 static bool
 638 instrument_memory_accesses (void)
 639 {
 640   basic_block bb;
 641   gimple_stmt_iterator gsi;
 642   bool fentry_exit_instrument = false;
 643
 644   FOR_EACH_BB_FN (bb, cfun)
 645     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 646       fentry_exit_instrument |= instrument_gimple (&gsi);
 647   return fentry_exit_instrument;
 648 }
 649
 650 /* Instruments function entry.  */
 651
 652 static void
 653 instrument_func_entry (void)
 654 {
 655   basic_block succ_bb;
 656   gimple_stmt_iterator gsi;
 657   tree ret_addr, builtin_decl;
 658   gimple g;
 659
 660   succ_bb = single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 661   gsi = gsi_after_labels (succ_bb);
 662
 663   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 664   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 665   ret_addr = make_ssa_name (ptr_type_node);
 666   gimple_call_set_lhs (g, ret_addr);
 667   gimple_set_location (g, cfun->function_start_locus);
 668   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 669
 670   builtin_decl =  builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 671   g = gimple_build_call (builtin_decl, 1, ret_addr);
 672   gimple_set_location (g, cfun->function_start_locus);
 673   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 674 }
 675
 676 /* Instruments function exits.  */
 677
 678 static void
 679 instrument_func_exit (void)
 680 {
 681   location_t loc;
 682   basic_block exit_bb;
 683   gimple_stmt_iterator gsi;
 684   gimple stmt, g;
 685   tree builtin_decl;
 686   edge e;
 687   edge_iterator ei;
 688
 689   /* Find all function exits.  */
 690   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 691   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 692     {
 693       gsi = gsi_last_bb (e->src);
 694       stmt = gsi_stmt (gsi);
 695       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 696                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 697       loc = gimple_location (stmt);
 698       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 699       g = gimple_build_call (builtin_decl, 0);
 700       gimple_set_location (g, loc);
 701       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 702     }
 703 }
 704
 705 /* ThreadSanitizer instrumentation pass.  */
 706
 707 static unsigned
 708 tsan_pass (void)
 709 {
 710   initialize_sanitizer_builtins ();
 711   if (instrument_memory_accesses ())
 712     {
 713       instrument_func_entry ();
 714       instrument_func_exit ();
 715     }
 716   return 0;
 717 }
 718
 719 /* Inserts __tsan_init () into the list of CTORs.  */
 720
 721 void
 722 tsan_finish_file (void)
 723 {
 724   tree ctor_statements = NULL_TREE;
 725
 726   initialize_sanitizer_builtins ();
 727   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 728   append_to_statement_list (build_call_expr (init_decl, 0),
 729                             &ctor_statements);
 730   cgraph_build_static_cdtor ('I', ctor_statements,
 731                              MAX_RESERVED_INIT_PRIORITY - 1);
 732 }
 733
 734 /* The pass descriptor.  */
 735
 736 namespace {
 737
 738 const pass_data pass_data_tsan =
 739 {
 740   GIMPLE_PASS, /* type */
 741   "tsan", /* name */
 742   OPTGROUP_NONE, /* optinfo_flags */
 743   TV_NONE, /* tv_id */
 744   ( PROP_ssa | PROP_cfg ), /* properties_required */
 745   0, /* properties_provided */
 746   0, /* properties_destroyed */
 747   0, /* todo_flags_start */
 748   TODO_update_ssa, /* todo_flags_finish */
 749 };
 750
 751 class pass_tsan : public gimple_opt_pass
 752 {
 753 public:
 754   pass_tsan (gcc::context *ctxt)
 755     : gimple_opt_pass (pass_data_tsan, ctxt)
 756   {}
 757
 758   /* opt_pass methods: */
 759   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 760   virtual bool gate (function *)
 761 {
 762   return (flag_sanitize & SANITIZE_THREAD) != 0;
 763 }
 764
 765   virtual unsigned int execute (function *) { return tsan_pass (); }
 766
 767 }; // class pass_tsan
 768
 769 } // anon namespace
 770
 771 gimple_opt_pass *
 772 make_pass_tsan (gcc::context *ctxt)
 773 {
 774   return new pass_tsan (ctxt);
 775 }
 776
 777 namespace {
 778
 779 const pass_data pass_data_tsan_O0 =
 780 {
 781   GIMPLE_PASS, /* type */
 782   "tsan0", /* name */
 783   OPTGROUP_NONE, /* optinfo_flags */
 784   TV_NONE, /* tv_id */
 785   ( PROP_ssa | PROP_cfg ), /* properties_required */
 786   0, /* properties_provided */
 787   0, /* properties_destroyed */
 788   0, /* todo_flags_start */
 789   TODO_update_ssa, /* todo_flags_finish */
 790 };
 791
 792 class pass_tsan_O0 : public gimple_opt_pass
 793 {
 794 public:
 795   pass_tsan_O0 (gcc::context *ctxt)
 796     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 797   {}
 798
 799   /* opt_pass methods: */
 800   virtual bool gate (function *)
 801     {
 802       return (flag_sanitize & SANITIZE_THREAD) != 0 && !optimize;
 803     }
 804
 805   virtual unsigned int execute (function *) { return tsan_pass (); }
 806
 807 }; // class pass_tsan_O0
 808
 809 } // anon namespace
 810
 811 gimple_opt_pass *
 812 make_pass_tsan_O0 (gcc::context *ctxt)
 813 {
 814   return new pass_tsan_O0 (ctxt);
 815 }