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 "hashtab.h"
  38 #include "hash-set.h"
  39 #include "vec.h"
  40 #include "machmode.h"
  41 #include "hard-reg-set.h"
  42 #include "input.h"
  43 #include "function.h"
  44 #include "gimple-ssa.h"
  45 #include "cgraph.h"
  46 #include "tree-cfg.h"
  47 #include "stringpool.h"
  48 #include "tree-ssanames.h"
  49 #include "tree-pass.h"
  50 #include "tree-iterator.h"
  51 #include "langhooks.h"
  52 #include "output.h"
  53 #include "options.h"
  54 #include "target.h"
  55 #include "diagnostic.h"
  56 #include "tree-ssa-propagate.h"
  57 #include "tsan.h"
  58 #include "asan.h"
  59
  60 /* Number of instrumented memory accesses in the current function.  */
  61
  62 /* Builds the following decl
  63    void __tsan_read/writeX (void *addr);  */
  64
  65 static tree
  66 get_memory_access_decl (bool is_write, unsigned size)
  67 {
  68   enum built_in_function fcode;
  69
  70   if (size <= 1)
  71     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  72                      : BUILT_IN_TSAN_READ1;
  73   else if (size <= 3)
  74     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  75                      : BUILT_IN_TSAN_READ2;
  76   else if (size <= 7)
  77     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  78                      : BUILT_IN_TSAN_READ4;
  79   else if (size <= 15)
  80     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  81                      : BUILT_IN_TSAN_READ8;
  82   else
  83     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  84                      : BUILT_IN_TSAN_READ16;
  85
  86   return builtin_decl_implicit (fcode);
  87 }
  88
  89 /* Check as to whether EXPR refers to a store to vptr.  */
  90
  91 static tree
  92 is_vptr_store (gimple stmt, tree expr, bool is_write)
  93 {
  94   if (is_write == true
  95       && gimple_assign_single_p (stmt)
  96       && TREE_CODE (expr) == COMPONENT_REF)
  97     {
  98       tree field = TREE_OPERAND (expr, 1);
  99       if (TREE_CODE (field) == FIELD_DECL
 100           && DECL_VIRTUAL_P (field))
 101         return gimple_assign_rhs1 (stmt);
 102     }
 103   return NULL;
 104 }
 105
 106 /* Instruments EXPR if needed. If any instrumentation is inserted,
 107    return true.  */
 108
 109 static bool
 110 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 111 {
 112   tree base, rhs, expr_ptr, builtin_decl;
 113   basic_block bb;
 114   HOST_WIDE_INT size;
 115   gimple stmt, g;
 116   gimple_seq seq;
 117   location_t loc;
 118
 119   size = int_size_in_bytes (TREE_TYPE (expr));
 120   if (size == -1)
 121     return false;
 122
 123   /* For now just avoid instrumenting bit field acceses.
 124      TODO: handle bit-fields as if touching the whole field.  */
 125   HOST_WIDE_INT bitsize, bitpos;
 126   tree offset;
 127   enum machine_mode mode;
 128   int volatilep = 0, unsignedp = 0;
 129   base = get_inner_reference (expr, &bitsize, &bitpos, &offset,
 130                               &mode, &unsignedp, &volatilep, false);
 131
 132   /* No need to instrument accesses to decls that don't escape,
 133      they can't escape to other threads then.  */
 134   if (DECL_P (base))
 135     {
 136       struct pt_solution pt;
 137       memset (&pt, 0, sizeof (pt));
 138       pt.escaped = 1;
 139       pt.ipa_escaped = flag_ipa_pta != 0;
 140       pt.nonlocal = 1;
 141       if (!pt_solution_includes (&pt, base))
 142         return false;
 143       if (!is_global_var (base) && !may_be_aliased (base))
 144         return false;
 145     }
 146
 147   if (TREE_READONLY (base)
 148       || (TREE_CODE (base) == VAR_DECL
 149           && DECL_HARD_REGISTER (base)))
 150     return false;
 151
 152   if (size == 0
 153       || bitpos % (size * BITS_PER_UNIT)
 154       || bitsize != size * BITS_PER_UNIT)
 155     return false;
 156
 157   stmt = gsi_stmt (gsi);
 158   loc = gimple_location (stmt);
 159   rhs = is_vptr_store (stmt, expr, is_write);
 160   gcc_checking_assert (rhs != NULL || is_gimple_addressable (expr));
 161   expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 162   seq = NULL;
 163   if (!is_gimple_val (expr_ptr))
 164     {
 165       g = gimple_build_assign (make_ssa_name (TREE_TYPE (expr_ptr), NULL),
 166                                expr_ptr);
 167       expr_ptr = gimple_assign_lhs (g);
 168       gimple_set_location (g, loc);
 169       gimple_seq_add_stmt_without_update (&seq, g);
 170     }
 171   if (rhs == NULL)
 172     g = gimple_build_call (get_memory_access_decl (is_write, size),
 173                            1, expr_ptr);
 174   else
 175     {
 176       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 177       g = gimple_build_call (builtin_decl, 1, expr_ptr);
 178     }
 179   gimple_set_location (g, loc);
 180   gimple_seq_add_stmt_without_update (&seq, g);
 181   /* Instrumentation for assignment of a function result
 182      must be inserted after the call.  Instrumentation for
 183      reads of function arguments must be inserted before the call.
 184      That's because the call can contain synchronization.  */
 185   if (is_gimple_call (stmt) && is_write)
 186     {
 187       /* If the call can throw, it must be the last stmt in
 188          a basic block, so the instrumented stmts need to be
 189          inserted in successor bbs.  */
 190       if (is_ctrl_altering_stmt (stmt))
 191         {
 192           edge e;
 193
 194           bb = gsi_bb (gsi);
 195           e = find_fallthru_edge (bb->succs);
 196           if (e)
 197             gsi_insert_seq_on_edge_immediate (e, seq);
 198         }
 199       else
 200         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 201     }
 202   else
 203     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 204
 205   return true;
 206 }
 207
 208 /* Actions for sync/atomic builtin transformations.  */
 209 enum tsan_atomic_action
 210 {
 211   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 212   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 213 };
 214
 215 /* Table how to map sync/atomic builtins to their corresponding
 216    tsan equivalents.  */
 217 static const struct tsan_map_atomic
 218 {
 219   enum built_in_function fcode, tsan_fcode;
 220   enum tsan_atomic_action action;
 221   enum tree_code code;
 222 } tsan_atomic_table[] =
 223 {
 224 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 225   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 226 #define CHECK_LAST(fcode, tsan_fcode) \
 227   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 228 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 229   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 230 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 231   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 232 #define WEAK_CAS(fcode, tsan_fcode) \
 233   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 234 #define STRONG_CAS(fcode, tsan_fcode) \
 235   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 236 #define BOOL_CAS(fcode, tsan_fcode) \
 237   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 238 #define VAL_CAS(fcode, tsan_fcode) \
 239   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 240 #define LOCK_RELEASE(fcode, tsan_fcode) \
 241   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 242 #define FETCH_OP(fcode, tsan_fcode, code) \
 243   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 244 #define FETCH_OPS(fcode, tsan_fcode, code) \
 245   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 246
 247   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 248   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 249   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 250   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 251   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 252   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 253   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 254   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 255   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 256   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 257   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 258   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 259   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 260   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 261   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 262   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 263   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 264   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 265   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 266   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 267   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 268   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 269   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 270   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 271   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 272   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 273   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 274   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 275   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 276   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 277   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 278   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 279   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 280   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 281   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 282   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 283   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 284   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 285   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 286   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 287   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 288   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 289   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 290   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 291   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 292
 293   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 294   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 295
 296   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 297   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 298   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 299   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 300   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 301   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 302   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 303   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 304   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 305   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 306   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 307   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 308   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 309   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 310   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 311   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 312   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 313   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 314   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 315   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 316   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 317   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 318   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 319   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 320   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 321   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 322   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 323   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 324   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 325   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 326
 327   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 328   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 329   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 330   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 331   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 332
 333   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 334   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 335   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 336   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 337   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 338   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 339   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 340   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 341   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 342   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 343   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 344   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 345   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 346   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 347   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 348   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 349   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 350   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 351   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 352   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 353   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 354   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 355   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 356   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 357   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 358   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 359   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 360   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 361   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 362   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 363
 364   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 365
 366   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 367   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 368   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 369   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 370   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 371   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 372   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 373   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 374   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 375   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 376   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 377   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 378   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 379   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 380   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 381   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 382   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 383   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 384   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 385   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 386   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 387   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 388   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 389   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 390   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 391   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 392   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 393   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 394   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 395   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 396
 397   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 398   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 399   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 400   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 401   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 402
 403   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 404   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 405               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 406   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 407               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 408   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 409               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 410   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 411               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 412
 413   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 414             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 415   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 416             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 417   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 418             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 419   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 420             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 421   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 422             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 423
 424   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 425   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 426   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 427   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 428   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 429            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 430
 431   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 432   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 433   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 434   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 435   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE)
 436 };
 437
 438 /* Instrument an atomic builtin.  */
 439
 440 static void
 441 instrument_builtin_call (gimple_stmt_iterator *gsi)
 442 {
 443   gimple stmt = gsi_stmt (*gsi), g;
 444   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 445   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 446   unsigned int i, num = gimple_call_num_args (stmt), j;
 447   for (j = 0; j < 6 && j < num; j++)
 448     args[j] = gimple_call_arg (stmt, j);
 449   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 450     if (fcode != tsan_atomic_table[i].fcode)
 451       continue;
 452     else
 453       {
 454         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 455         if (decl == NULL_TREE)
 456           return;
 457         switch (tsan_atomic_table[i].action)
 458           {
 459           case check_last:
 460           case fetch_op:
 461             last_arg = gimple_call_arg (stmt, num - 1);
 462             if (!tree_fits_uhwi_p (last_arg)
 463                 || tree_to_uhwi (last_arg) > MEMMODEL_SEQ_CST)
 464               return;
 465             gimple_call_set_fndecl (stmt, decl);
 466             update_stmt (stmt);
 467             if (tsan_atomic_table[i].action == fetch_op)
 468               {
 469                 args[1] = gimple_call_arg (stmt, 1);
 470                 goto adjust_result;
 471               }
 472             return;
 473           case add_seq_cst:
 474           case add_acquire:
 475           case fetch_op_seq_cst:
 476             gcc_assert (num <= 2);
 477             for (j = 0; j < num; j++)
 478               args[j] = gimple_call_arg (stmt, j);
 479             for (; j < 2; j++)
 480               args[j] = NULL_TREE;
 481             args[num] = build_int_cst (NULL_TREE,
 482                                        tsan_atomic_table[i].action
 483                                        != add_acquire
 484                                        ? MEMMODEL_SEQ_CST
 485                                        : MEMMODEL_ACQUIRE);
 486             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 487             stmt = gsi_stmt (*gsi);
 488             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 489               {
 490               adjust_result:
 491                 lhs = gimple_call_lhs (stmt);
 492                 if (lhs == NULL_TREE)
 493                   return;
 494                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 495                                                 TREE_TYPE (args[1])))
 496                   {
 497                     tree var = make_ssa_name (TREE_TYPE (lhs), NULL);
 498                     g = gimple_build_assign_with_ops (NOP_EXPR, var,
 499                                                       args[1], NULL_TREE);
 500                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 501                     args[1] = var;
 502                   }
 503                 gimple_call_set_lhs (stmt,
 504                                      make_ssa_name (TREE_TYPE (lhs), NULL));
 505                 /* BIT_NOT_EXPR stands for NAND.  */
 506                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 507                   {
 508                     tree var = make_ssa_name (TREE_TYPE (lhs), NULL);
 509                     g = gimple_build_assign_with_ops (BIT_AND_EXPR, var,
 510                                                       gimple_call_lhs (stmt),
 511                                                       args[1]);
 512                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 513                     g = gimple_build_assign_with_ops (BIT_NOT_EXPR, lhs, var,
 514                                                       NULL_TREE);
 515                   }
 516                 else
 517                   g = gimple_build_assign_with_ops (tsan_atomic_table[i].code,
 518                                                     lhs,
 519                                                     gimple_call_lhs (stmt),
 520                                                     args[1]);
 521                 update_stmt (stmt);
 522                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 523               }
 524             return;
 525           case weak_cas:
 526             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 527               continue;
 528             /* FALLTHRU */
 529           case strong_cas:
 530             gcc_assert (num == 6);
 531             for (j = 0; j < 6; j++)
 532               args[j] = gimple_call_arg (stmt, j);
 533             if (!tree_fits_uhwi_p (args[4])
 534                 || tree_to_uhwi (args[4]) > MEMMODEL_SEQ_CST)
 535               return;
 536             if (!tree_fits_uhwi_p (args[5])
 537                 || tree_to_uhwi (args[5]) > MEMMODEL_SEQ_CST)
 538               return;
 539             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 540                                 args[4], args[5]);
 541             return;
 542           case bool_cas:
 543           case val_cas:
 544             gcc_assert (num == 3);
 545             for (j = 0; j < 3; j++)
 546               args[j] = gimple_call_arg (stmt, j);
 547             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 548             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 549             t = create_tmp_var (t, NULL);
 550             mark_addressable (t);
 551             if (!useless_type_conversion_p (TREE_TYPE (t),
 552                                             TREE_TYPE (args[1])))
 553               {
 554                 g = gimple_build_assign_with_ops (NOP_EXPR,
 555                                                   make_ssa_name (TREE_TYPE (t),
 556                                                                  NULL),
 557                                                   args[1], NULL_TREE);
 558                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 559                 args[1] = gimple_assign_lhs (g);
 560               }
 561             g = gimple_build_assign (t, args[1]);
 562             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 563             lhs = gimple_call_lhs (stmt);
 564             update_gimple_call (gsi, decl, 5, args[0],
 565                                 build_fold_addr_expr (t), args[2],
 566                                 build_int_cst (NULL_TREE,
 567                                                MEMMODEL_SEQ_CST),
 568                                 build_int_cst (NULL_TREE,
 569                                                MEMMODEL_SEQ_CST));
 570             if (tsan_atomic_table[i].action == val_cas && lhs)
 571               {
 572                 tree cond;
 573                 stmt = gsi_stmt (*gsi);
 574                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t), NULL),
 575                                          t);
 576                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 577                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 578                 cond = build2 (NE_EXPR, boolean_type_node, t,
 579                                build_int_cst (TREE_TYPE (t), 0));
 580                 g = gimple_build_assign_with_ops (COND_EXPR, lhs, cond,
 581                                                   args[1],
 582                                                   gimple_assign_lhs (g));
 583                 gimple_call_set_lhs (stmt, t);
 584                 update_stmt (stmt);
 585                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 586               }
 587             return;
 588           case lock_release:
 589             gcc_assert (num == 1);
 590             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 591             t = TREE_VALUE (TREE_CHAIN (t));
 592             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 593                                 build_int_cst (t, 0),
 594                                 build_int_cst (NULL_TREE,
 595                                                MEMMODEL_RELEASE));
 596             return;
 597           default:
 598             continue;
 599           }
 600       }
 601 }
 602
 603 /* Instruments the gimple pointed to by GSI. Return
 604    true if func entry/exit should be instrumented.  */
 605
 606 static bool
 607 instrument_gimple (gimple_stmt_iterator *gsi)
 608 {
 609   gimple stmt;
 610   tree rhs, lhs;
 611   bool instrumented = false;
 612
 613   stmt = gsi_stmt (*gsi);
 614   if (is_gimple_call (stmt)
 615       && (gimple_call_fndecl (stmt)
 616           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 617     {
 618       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 619         instrument_builtin_call (gsi);
 620       return true;
 621     }
 622   else if (is_gimple_assign (stmt)
 623            && !gimple_clobber_p (stmt))
 624     {
 625       if (gimple_store_p (stmt))
 626         {
 627           lhs = gimple_assign_lhs (stmt);
 628           instrumented = instrument_expr (*gsi, lhs, true);
 629         }
 630       if (gimple_assign_load_p (stmt))
 631         {
 632           rhs = gimple_assign_rhs1 (stmt);
 633           instrumented = instrument_expr (*gsi, rhs, false);
 634         }
 635     }
 636   return instrumented;
 637 }
 638
 639 /* Instruments all interesting memory accesses in the current function.
 640    Return true if func entry/exit should be instrumented.  */
 641
 642 static bool
 643 instrument_memory_accesses (void)
 644 {
 645   basic_block bb;
 646   gimple_stmt_iterator gsi;
 647   bool fentry_exit_instrument = false;
 648
 649   FOR_EACH_BB_FN (bb, cfun)
 650     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 651       fentry_exit_instrument |= instrument_gimple (&gsi);
 652   return fentry_exit_instrument;
 653 }
 654
 655 /* Instruments function entry.  */
 656
 657 static void
 658 instrument_func_entry (void)
 659 {
 660   basic_block succ_bb;
 661   gimple_stmt_iterator gsi;
 662   tree ret_addr, builtin_decl;
 663   gimple g;
 664
 665   succ_bb = single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 666   gsi = gsi_after_labels (succ_bb);
 667
 668   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 669   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 670   ret_addr = make_ssa_name (ptr_type_node, NULL);
 671   gimple_call_set_lhs (g, ret_addr);
 672   gimple_set_location (g, cfun->function_start_locus);
 673   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 674
 675   builtin_decl =  builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 676   g = gimple_build_call (builtin_decl, 1, ret_addr);
 677   gimple_set_location (g, cfun->function_start_locus);
 678   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 679 }
 680
 681 /* Instruments function exits.  */
 682
 683 static void
 684 instrument_func_exit (void)
 685 {
 686   location_t loc;
 687   basic_block exit_bb;
 688   gimple_stmt_iterator gsi;
 689   gimple stmt, g;
 690   tree builtin_decl;
 691   edge e;
 692   edge_iterator ei;
 693
 694   /* Find all function exits.  */
 695   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 696   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 697     {
 698       gsi = gsi_last_bb (e->src);
 699       stmt = gsi_stmt (gsi);
 700       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 701                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 702       loc = gimple_location (stmt);
 703       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 704       g = gimple_build_call (builtin_decl, 0);
 705       gimple_set_location (g, loc);
 706       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 707     }
 708 }
 709
 710 /* ThreadSanitizer instrumentation pass.  */
 711
 712 static unsigned
 713 tsan_pass (void)
 714 {
 715   initialize_sanitizer_builtins ();
 716   if (instrument_memory_accesses ())
 717     {
 718       instrument_func_entry ();
 719       instrument_func_exit ();
 720     }
 721   return 0;
 722 }
 723
 724 /* Inserts __tsan_init () into the list of CTORs.  */
 725
 726 void
 727 tsan_finish_file (void)
 728 {
 729   tree ctor_statements = NULL_TREE;
 730
 731   initialize_sanitizer_builtins ();
 732   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 733   append_to_statement_list (build_call_expr (init_decl, 0),
 734                             &ctor_statements);
 735   cgraph_build_static_cdtor ('I', ctor_statements,
 736                              MAX_RESERVED_INIT_PRIORITY - 1);
 737 }
 738
 739 /* The pass descriptor.  */
 740
 741 namespace {
 742
 743 const pass_data pass_data_tsan =
 744 {
 745   GIMPLE_PASS, /* type */
 746   "tsan", /* name */
 747   OPTGROUP_NONE, /* optinfo_flags */
 748   TV_NONE, /* tv_id */
 749   ( PROP_ssa | PROP_cfg ), /* properties_required */
 750   0, /* properties_provided */
 751   0, /* properties_destroyed */
 752   0, /* todo_flags_start */
 753   TODO_update_ssa, /* todo_flags_finish */
 754 };
 755
 756 class pass_tsan : public gimple_opt_pass
 757 {
 758 public:
 759   pass_tsan (gcc::context *ctxt)
 760     : gimple_opt_pass (pass_data_tsan, ctxt)
 761   {}
 762
 763   /* opt_pass methods: */
 764   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 765   virtual bool gate (function *)
 766 {
 767   return (flag_sanitize & SANITIZE_THREAD) != 0;
 768 }
 769
 770   virtual unsigned int execute (function *) { return tsan_pass (); }
 771
 772 }; // class pass_tsan
 773
 774 } // anon namespace
 775
 776 gimple_opt_pass *
 777 make_pass_tsan (gcc::context *ctxt)
 778 {
 779   return new pass_tsan (ctxt);
 780 }
 781
 782 namespace {
 783
 784 const pass_data pass_data_tsan_O0 =
 785 {
 786   GIMPLE_PASS, /* type */
 787   "tsan0", /* name */
 788   OPTGROUP_NONE, /* optinfo_flags */
 789   TV_NONE, /* tv_id */
 790   ( PROP_ssa | PROP_cfg ), /* properties_required */
 791   0, /* properties_provided */
 792   0, /* properties_destroyed */
 793   0, /* todo_flags_start */
 794   TODO_update_ssa, /* todo_flags_finish */
 795 };
 796
 797 class pass_tsan_O0 : public gimple_opt_pass
 798 {
 799 public:
 800   pass_tsan_O0 (gcc::context *ctxt)
 801     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 802   {}
 803
 804   /* opt_pass methods: */
 805   virtual bool gate (function *)
 806     {
 807       return (flag_sanitize & SANITIZE_THREAD) != 0 && !optimize;
 808     }
 809
 810   virtual unsigned int execute (function *) { return tsan_pass (); }
 811
 812 }; // class pass_tsan_O0
 813
 814 } // anon namespace
 815
 816 gimple_opt_pass *
 817 make_pass_tsan_O0 (gcc::context *ctxt)
 818 {
 819   return new pass_tsan_O0 (ctxt);
 820 }