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