gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2013 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 "intl.h"
  27 #include "tm.h"
  28 #include "basic-block.h"
  29 #include "gimple.h"
  30 #include "function.h"
  31 #include "gimple-ssa.h"
  32 #include "cgraph.h"
  33 #include "tree-cfg.h"
  34 #include "tree-ssanames.h"
  35 #include "tree-pass.h"
  36 #include "tree-iterator.h"
  37 #include "langhooks.h"
  38 #include "output.h"
  39 #include "options.h"
  40 #include "target.h"
  41 #include "diagnostic.h"
  42 #include "tree-ssa-propagate.h"
  43 #include "tsan.h"
  44 #include "asan.h"
  45
  46 /* Number of instrumented memory accesses in the current function.  */
  47
  48 /* Builds the following decl
  49    void __tsan_read/writeX (void *addr);  */
  50
  51 static tree
  52 get_memory_access_decl (bool is_write, unsigned size)
  53 {
  54   enum built_in_function fcode;
  55
  56   if (size <= 1)
  57     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  58                      : BUILT_IN_TSAN_READ1;
  59   else if (size <= 3)
  60     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  61                      : BUILT_IN_TSAN_READ2;
  62   else if (size <= 7)
  63     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  64                      : BUILT_IN_TSAN_READ4;
  65   else if (size <= 15)
  66     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  67                      : BUILT_IN_TSAN_READ8;
  68   else
  69     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  70                      : BUILT_IN_TSAN_READ16;
  71
  72   return builtin_decl_implicit (fcode);
  73 }
  74
  75 /* Check as to whether EXPR refers to a store to vptr.  */
  76
  77 static tree
  78 is_vptr_store (gimple stmt, tree expr, bool is_write)
  79 {
  80   if (is_write == true
  81       && gimple_assign_single_p (stmt)
  82       && TREE_CODE (expr) == COMPONENT_REF)
  83     {
  84       tree field = TREE_OPERAND (expr, 1);
  85       if (TREE_CODE (field) == FIELD_DECL
  86           && DECL_VIRTUAL_P (field))
  87         return gimple_assign_rhs1 (stmt);
  88     }
  89   return NULL;
  90 }
  91
  92 /* Instruments EXPR if needed. If any instrumentation is inserted,
  93    return true.  */
  94
  95 static bool
  96 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
  97 {
  98   tree base, rhs, expr_ptr, builtin_decl;
  99   basic_block bb;
 100   HOST_WIDE_INT size;
 101   gimple stmt, g;
 102   gimple_seq seq;
 103   location_t loc;
 104
 105   size = int_size_in_bytes (TREE_TYPE (expr));
 106   if (size == -1)
 107     return false;
 108
 109   /* For now just avoid instrumenting bit field acceses.
 110      TODO: handle bit-fields as if touching the whole field.  */
 111   HOST_WIDE_INT bitsize, bitpos;
 112   tree offset;
 113   enum machine_mode mode;
 114   int volatilep = 0, unsignedp = 0;
 115   base = get_inner_reference (expr, &bitsize, &bitpos, &offset,
 116                               &mode, &unsignedp, &volatilep, false);
 117
 118   /* No need to instrument accesses to decls that don't escape,
 119      they can't escape to other threads then.  */
 120   if (DECL_P (base))
 121     {
 122       struct pt_solution pt;
 123       memset (&pt, 0, sizeof (pt));
 124       pt.escaped = 1;
 125       pt.ipa_escaped = flag_ipa_pta != 0;
 126       pt.nonlocal = 1;
 127       if (!pt_solution_includes (&pt, base))
 128         return false;
 129       if (!is_global_var (base) && !may_be_aliased (base))
 130         return false;
 131     }
 132
 133   if (TREE_READONLY (base)
 134       || (TREE_CODE (base) == VAR_DECL
 135           && DECL_HARD_REGISTER (base)))
 136     return false;
 137
 138   if (size == 0
 139       || bitpos % (size * BITS_PER_UNIT)
 140       || bitsize != size * BITS_PER_UNIT)
 141     return false;
 142
 143   stmt = gsi_stmt (gsi);
 144   loc = gimple_location (stmt);
 145   rhs = is_vptr_store (stmt, expr, is_write);
 146   gcc_checking_assert (rhs != NULL || is_gimple_addressable (expr));
 147   expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 148   seq = NULL;
 149   if (!is_gimple_val (expr_ptr))
 150     {
 151       g = gimple_build_assign (make_ssa_name (TREE_TYPE (expr_ptr), NULL),
 152                                expr_ptr);
 153       expr_ptr = gimple_assign_lhs (g);
 154       gimple_set_location (g, loc);
 155       gimple_seq_add_stmt_without_update (&seq, g);
 156     }
 157   if (rhs == NULL)
 158     g = gimple_build_call (get_memory_access_decl (is_write, size),
 159                            1, expr_ptr);
 160   else
 161     {
 162       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 163       g = gimple_build_call (builtin_decl, 1, expr_ptr);
 164     }
 165   gimple_set_location (g, loc);
 166   gimple_seq_add_stmt_without_update (&seq, g);
 167   /* Instrumentation for assignment of a function result
 168      must be inserted after the call.  Instrumentation for
 169      reads of function arguments must be inserted before the call.
 170      That's because the call can contain synchronization.  */
 171   if (is_gimple_call (stmt) && is_write)
 172     {
 173       /* If the call can throw, it must be the last stmt in
 174          a basic block, so the instrumented stmts need to be
 175          inserted in successor bbs.  */
 176       if (is_ctrl_altering_stmt (stmt))
 177         {
 178           edge e;
 179
 180           bb = gsi_bb (gsi);
 181           e = find_fallthru_edge (bb->succs);
 182           if (e)
 183             gsi_insert_seq_on_edge_immediate (e, seq);
 184         }
 185       else
 186         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 187     }
 188   else
 189     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 190
 191   return true;
 192 }
 193
 194 /* Actions for sync/atomic builtin transformations.  */
 195 enum tsan_atomic_action
 196 {
 197   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 198   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 199 };
 200
 201 /* Table how to map sync/atomic builtins to their corresponding
 202    tsan equivalents.  */
 203 static const struct tsan_map_atomic
 204 {
 205   enum built_in_function fcode, tsan_fcode;
 206   enum tsan_atomic_action action;
 207   enum tree_code code;
 208 } tsan_atomic_table[] =
 209 {
 210 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 211   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 212 #define CHECK_LAST(fcode, tsan_fcode) \
 213   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 214 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 215   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 216 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 217   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 218 #define WEAK_CAS(fcode, tsan_fcode) \
 219   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 220 #define STRONG_CAS(fcode, tsan_fcode) \
 221   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 222 #define BOOL_CAS(fcode, tsan_fcode) \
 223   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 224 #define VAL_CAS(fcode, tsan_fcode) \
 225   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 226 #define LOCK_RELEASE(fcode, tsan_fcode) \
 227   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 228 #define FETCH_OP(fcode, tsan_fcode, code) \
 229   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 230 #define FETCH_OPS(fcode, tsan_fcode, code) \
 231   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 232
 233   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 234   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 235   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 236   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 237   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 238   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 239   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 240   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 241   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 242   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 243   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 244   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 245   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 246   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 247   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 248   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 249   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 250   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 251   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 252   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 253   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 254   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 255   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 256   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 257   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 258   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 259   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 260   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 261   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 262   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 263   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 264   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 265   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 266   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 267   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 268   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 269   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 270   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 271   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 272   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 273   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 274   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 275   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 276   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 277   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 278
 279   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 280   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 281
 282   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 283   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 284   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 285   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 286   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 287   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 288   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 289   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 290   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 291   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 292   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 293   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 294   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 295   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 296   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 297   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 298   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 299   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 300   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 301   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 302   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 303   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 304   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 305   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 306   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 307   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 308   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 309   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 310   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 311   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 312
 313   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 314   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 315   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 316   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 317   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 318
 319   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 320   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 321   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 322   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 323   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 324   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 325   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 326   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 327   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 328   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 329   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 330   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 331   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 332   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 333   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 334   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 335   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 336   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 337   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 338   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 339   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 340   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 341   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 342   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 343   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 344   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 345   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 346   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 347   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 348   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 349
 350   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 351
 352   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 353   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 354   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 355   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 356   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 357   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 358   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 359   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 360   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 361   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 362   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 363   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 364   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 365   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 366   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 367   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 368   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 369   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 370   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 371   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 372   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 373   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 374   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 375   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 376   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 377   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 378   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 379   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 380   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 381   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 382
 383   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 384   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 385   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 386   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 387   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 388
 389   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 390   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 391               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 392   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 393               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 394   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 395               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 396   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 397               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 398
 399   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 400             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 401   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 402             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 403   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 404             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 405   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 406             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 407   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 408             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 409
 410   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 411   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 412   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 413   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 414   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 415            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 416
 417   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 418   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 419   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 420   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 421   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE)
 422 };
 423
 424 /* Instrument an atomic builtin.  */
 425
 426 static void
 427 instrument_builtin_call (gimple_stmt_iterator *gsi)
 428 {
 429   gimple stmt = gsi_stmt (*gsi), g;
 430   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 431   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 432   unsigned int i, num = gimple_call_num_args (stmt), j;
 433   for (j = 0; j < 6 && j < num; j++)
 434     args[j] = gimple_call_arg (stmt, j);
 435   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 436     if (fcode != tsan_atomic_table[i].fcode)
 437       continue;
 438     else
 439       {
 440         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 441         if (decl == NULL_TREE)
 442           return;
 443         switch (tsan_atomic_table[i].action)
 444           {
 445           case check_last:
 446           case fetch_op:
 447             last_arg = gimple_call_arg (stmt, num - 1);
 448             if (!host_integerp (last_arg, 1)
 449                 || (unsigned HOST_WIDE_INT) tree_low_cst (last_arg, 1)
 450                    > MEMMODEL_SEQ_CST)
 451               return;
 452             gimple_call_set_fndecl (stmt, decl);
 453             update_stmt (stmt);
 454             if (tsan_atomic_table[i].action == fetch_op)
 455               {
 456                 args[1] = gimple_call_arg (stmt, 1);
 457                 goto adjust_result;
 458               }
 459             return;
 460           case add_seq_cst:
 461           case add_acquire:
 462           case fetch_op_seq_cst:
 463             gcc_assert (num <= 2);
 464             for (j = 0; j < num; j++)
 465               args[j] = gimple_call_arg (stmt, j);
 466             for (; j < 2; j++)
 467               args[j] = NULL_TREE;
 468             args[num] = build_int_cst (NULL_TREE,
 469                                        tsan_atomic_table[i].action
 470                                        != add_acquire
 471                                        ? MEMMODEL_SEQ_CST
 472                                        : MEMMODEL_ACQUIRE);
 473             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 474             stmt = gsi_stmt (*gsi);
 475             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 476               {
 477               adjust_result:
 478                 lhs = gimple_call_lhs (stmt);
 479                 if (lhs == NULL_TREE)
 480                   return;
 481                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 482                                                 TREE_TYPE (args[1])))
 483                   {
 484                     tree var = make_ssa_name (TREE_TYPE (lhs), NULL);
 485                     g = gimple_build_assign_with_ops (NOP_EXPR, var,
 486                                                       args[1], NULL_TREE);
 487                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 488                     args[1] = var;
 489                   }
 490                 gimple_call_set_lhs (stmt,
 491                                      make_ssa_name (TREE_TYPE (lhs), NULL));
 492                 /* BIT_NOT_EXPR stands for NAND.  */
 493                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 494                   {
 495                     tree var = make_ssa_name (TREE_TYPE (lhs), NULL);
 496                     g = gimple_build_assign_with_ops (BIT_AND_EXPR, var,
 497                                                       gimple_call_lhs (stmt),
 498                                                       args[1]);
 499                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 500                     g = gimple_build_assign_with_ops (BIT_NOT_EXPR, lhs, var,
 501                                                       NULL_TREE);
 502                   }
 503                 else
 504                   g = gimple_build_assign_with_ops (tsan_atomic_table[i].code,
 505                                                     lhs,
 506                                                     gimple_call_lhs (stmt),
 507                                                     args[1]);
 508                 update_stmt (stmt);
 509                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 510               }
 511             return;
 512           case weak_cas:
 513             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 514               continue;
 515             /* FALLTHRU */
 516           case strong_cas:
 517             gcc_assert (num == 6);
 518             for (j = 0; j < 6; j++)
 519               args[j] = gimple_call_arg (stmt, j);
 520             if (!host_integerp (args[4], 1)
 521                 || (unsigned HOST_WIDE_INT) tree_low_cst (args[4], 1)
 522                    > MEMMODEL_SEQ_CST)
 523               return;
 524             if (!host_integerp (args[5], 1)
 525                 || (unsigned HOST_WIDE_INT) tree_low_cst (args[5], 1)
 526                    > MEMMODEL_SEQ_CST)
 527               return;
 528             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 529                                 args[4], args[5]);
 530             return;
 531           case bool_cas:
 532           case val_cas:
 533             gcc_assert (num == 3);
 534             for (j = 0; j < 3; j++)
 535               args[j] = gimple_call_arg (stmt, j);
 536             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 537             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 538             t = create_tmp_var (t, NULL);
 539             mark_addressable (t);
 540             if (!useless_type_conversion_p (TREE_TYPE (t),
 541                                             TREE_TYPE (args[1])))
 542               {
 543                 g = gimple_build_assign_with_ops (NOP_EXPR,
 544                                                   make_ssa_name (TREE_TYPE (t),
 545                                                                  NULL),
 546                                                   args[1], NULL_TREE);
 547                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 548                 args[1] = gimple_assign_lhs (g);
 549               }
 550             g = gimple_build_assign (t, args[1]);
 551             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 552             lhs = gimple_call_lhs (stmt);
 553             update_gimple_call (gsi, decl, 5, args[0],
 554                                 build_fold_addr_expr (t), args[2],
 555                                 build_int_cst (NULL_TREE,
 556                                                MEMMODEL_SEQ_CST),
 557                                 build_int_cst (NULL_TREE,
 558                                                MEMMODEL_SEQ_CST));
 559             if (tsan_atomic_table[i].action == val_cas && lhs)
 560               {
 561                 tree cond;
 562                 stmt = gsi_stmt (*gsi);
 563                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t), NULL),
 564                                          t);
 565                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 566                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 567                 cond = build2 (NE_EXPR, boolean_type_node, t,
 568                                build_int_cst (TREE_TYPE (t), 0));
 569                 g = gimple_build_assign_with_ops (COND_EXPR, lhs, cond,
 570                                                   args[1],
 571                                                   gimple_assign_lhs (g));
 572                 gimple_call_set_lhs (stmt, t);
 573                 update_stmt (stmt);
 574                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 575               }
 576             return;
 577           case lock_release:
 578             gcc_assert (num == 1);
 579             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 580             t = TREE_VALUE (TREE_CHAIN (t));
 581             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 582                                 build_int_cst (t, 0),
 583                                 build_int_cst (NULL_TREE,
 584                                                MEMMODEL_RELEASE));
 585             return;
 586           default:
 587             continue;
 588           }
 589       }
 590 }
 591
 592 /* Instruments the gimple pointed to by GSI. Return
 593    true if func entry/exit should be instrumented.  */
 594
 595 static bool
 596 instrument_gimple (gimple_stmt_iterator *gsi)
 597 {
 598   gimple stmt;
 599   tree rhs, lhs;
 600   bool instrumented = false;
 601
 602   stmt = gsi_stmt (*gsi);
 603   if (is_gimple_call (stmt)
 604       && (gimple_call_fndecl (stmt)
 605           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 606     {
 607       if (is_gimple_builtin_call (stmt))
 608         instrument_builtin_call (gsi);
 609       return true;
 610     }
 611   else if (is_gimple_assign (stmt)
 612            && !gimple_clobber_p (stmt))
 613     {
 614       if (gimple_store_p (stmt))
 615         {
 616           lhs = gimple_assign_lhs (stmt);
 617           instrumented = instrument_expr (*gsi, lhs, true);
 618         }
 619       if (gimple_assign_load_p (stmt))
 620         {
 621           rhs = gimple_assign_rhs1 (stmt);
 622           instrumented = instrument_expr (*gsi, rhs, false);
 623         }
 624     }
 625   return instrumented;
 626 }
 627
 628 /* Instruments all interesting memory accesses in the current function.
 629    Return true if func entry/exit should be instrumented.  */
 630
 631 static bool
 632 instrument_memory_accesses (void)
 633 {
 634   basic_block bb;
 635   gimple_stmt_iterator gsi;
 636   bool fentry_exit_instrument = false;
 637
 638   FOR_EACH_BB (bb)
 639     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 640       fentry_exit_instrument |= instrument_gimple (&gsi);
 641   return fentry_exit_instrument;
 642 }
 643
 644 /* Instruments function entry.  */
 645
 646 static void
 647 instrument_func_entry (void)
 648 {
 649   basic_block succ_bb;
 650   gimple_stmt_iterator gsi;
 651   tree ret_addr, builtin_decl;
 652   gimple g;
 653
 654   succ_bb = single_succ (ENTRY_BLOCK_PTR);
 655   gsi = gsi_after_labels (succ_bb);
 656
 657   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 658   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 659   ret_addr = make_ssa_name (ptr_type_node, NULL);
 660   gimple_call_set_lhs (g, ret_addr);
 661   gimple_set_location (g, cfun->function_start_locus);
 662   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 663
 664   builtin_decl =  builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 665   g = gimple_build_call (builtin_decl, 1, ret_addr);
 666   gimple_set_location (g, cfun->function_start_locus);
 667   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 668 }
 669
 670 /* Instruments function exits.  */
 671
 672 static void
 673 instrument_func_exit (void)
 674 {
 675   location_t loc;
 676   basic_block exit_bb;
 677   gimple_stmt_iterator gsi;
 678   gimple stmt, g;
 679   tree builtin_decl;
 680   edge e;
 681   edge_iterator ei;
 682
 683   /* Find all function exits.  */
 684   exit_bb = EXIT_BLOCK_PTR;
 685   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 686     {
 687       gsi = gsi_last_bb (e->src);
 688       stmt = gsi_stmt (gsi);
 689       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 690                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 691       loc = gimple_location (stmt);
 692       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 693       g = gimple_build_call (builtin_decl, 0);
 694       gimple_set_location (g, loc);
 695       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 696     }
 697 }
 698
 699 /* ThreadSanitizer instrumentation pass.  */
 700
 701 static unsigned
 702 tsan_pass (void)
 703 {
 704   initialize_sanitizer_builtins ();
 705   if (instrument_memory_accesses ())
 706     {
 707       instrument_func_entry ();
 708       instrument_func_exit ();
 709     }
 710   return 0;
 711 }
 712
 713 /* The pass's gate.  */
 714
 715 static bool
 716 tsan_gate (void)
 717 {
 718   return (flag_sanitize & SANITIZE_THREAD) != 0;
 719 }
 720
 721 /* Inserts __tsan_init () into the list of CTORs.  */
 722
 723 void
 724 tsan_finish_file (void)
 725 {
 726   tree ctor_statements = NULL_TREE;
 727
 728   initialize_sanitizer_builtins ();
 729   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 730   append_to_statement_list (build_call_expr (init_decl, 0),
 731                             &ctor_statements);
 732   cgraph_build_static_cdtor ('I', ctor_statements,
 733                              MAX_RESERVED_INIT_PRIORITY - 1);
 734 }
 735
 736 /* The pass descriptor.  */
 737
 738 namespace {
 739
 740 const pass_data pass_data_tsan =
 741 {
 742   GIMPLE_PASS, /* type */
 743   "tsan", /* name */
 744   OPTGROUP_NONE, /* optinfo_flags */
 745   true, /* has_gate */
 746   true, /* has_execute */
 747   TV_NONE, /* tv_id */
 748   ( PROP_ssa | PROP_cfg ), /* properties_required */
 749   0, /* properties_provided */
 750   0, /* properties_destroyed */
 751   0, /* todo_flags_start */
 752   ( TODO_verify_all | TODO_update_ssa ), /* todo_flags_finish */
 753 };
 754
 755 class pass_tsan : public gimple_opt_pass
 756 {
 757 public:
 758   pass_tsan (gcc::context *ctxt)
 759     : gimple_opt_pass (pass_data_tsan, ctxt)
 760   {}
 761
 762   /* opt_pass methods: */
 763   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 764   bool gate () { return tsan_gate (); }
 765   unsigned int execute () { 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 static bool
 778 tsan_gate_O0 (void)
 779 {
 780   return (flag_sanitize & SANITIZE_THREAD) != 0 && !optimize;
 781 }
 782
 783 namespace {
 784
 785 const pass_data pass_data_tsan_O0 =
 786 {
 787   GIMPLE_PASS, /* type */
 788   "tsan0", /* name */
 789   OPTGROUP_NONE, /* optinfo_flags */
 790   true, /* has_gate */
 791   true, /* has_execute */
 792   TV_NONE, /* tv_id */
 793   ( PROP_ssa | PROP_cfg ), /* properties_required */
 794   0, /* properties_provided */
 795   0, /* properties_destroyed */
 796   0, /* todo_flags_start */
 797   ( TODO_verify_all | TODO_update_ssa ), /* todo_flags_finish */
 798 };
 799
 800 class pass_tsan_O0 : public gimple_opt_pass
 801 {
 802 public:
 803   pass_tsan_O0 (gcc::context *ctxt)
 804     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 805   {}
 806
 807   /* opt_pass methods: */
 808   bool gate () { return tsan_gate_O0 (); }
 809   unsigned int execute () { return tsan_pass (); }
 810
 811 }; // class pass_tsan_O0
 812
 813 } // anon namespace
 814
 815 gimple_opt_pass *
 816 make_pass_tsan_O0 (gcc::context *ctxt)
 817 {
 818   return new pass_tsan_O0 (ctxt);
 819 }