gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2014 Free Software Foundation, Inc.
   3    Contributed by Dmitry Vyukov <dvyukov@google.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tree.h"
  26 #include "expr.h"
  27 #include "intl.h"
  28 #include "tm.h"
  29 #include "predict.h"
  30 #include "vec.h"
  31 #include "hashtab.h"
  32 #include "hash-set.h"
  33 #include "machmode.h"
  34 #include "hard-reg-set.h"
  35 #include "input.h"
  36 #include "function.h"
  37 #include "dominance.h"
  38 #include "cfg.h"
  39 #include "basic-block.h"
  40 #include "tree-ssa-alias.h"
  41 #include "internal-fn.h"
  42 #include "gimple-expr.h"
  43 #include "is-a.h"
  44 #include "gimple.h"
  45 #include "gimplify.h"
  46 #include "gimple-iterator.h"
  47 #include "gimple-ssa.h"
  48 #include "hash-map.h"
  49 #include "plugin-api.h"
  50 #include "ipa-ref.h"
  51 #include "cgraph.h"
  52 #include "tree-cfg.h"
  53 #include "stringpool.h"
  54 #include "tree-ssanames.h"
  55 #include "tree-pass.h"
  56 #include "tree-iterator.h"
  57 #include "langhooks.h"
  58 #include "output.h"
  59 #include "options.h"
  60 #include "target.h"
  61 #include "diagnostic.h"
  62 #include "tree-ssa-propagate.h"
  63 #include "tsan.h"
  64 #include "asan.h"
  65
  66 /* Number of instrumented memory accesses in the current function.  */
  67
  68 /* Builds the following decl
  69    void __tsan_read/writeX (void *addr);  */
  70
  71 static tree
  72 get_memory_access_decl (bool is_write, unsigned size)
  73 {
  74   enum built_in_function fcode;
  75
  76   if (size <= 1)
  77     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  78                      : BUILT_IN_TSAN_READ1;
  79   else if (size <= 3)
  80     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  81                      : BUILT_IN_TSAN_READ2;
  82   else if (size <= 7)
  83     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  84                      : BUILT_IN_TSAN_READ4;
  85   else if (size <= 15)
  86     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  87                      : BUILT_IN_TSAN_READ8;
  88   else
  89     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  90                      : BUILT_IN_TSAN_READ16;
  91
  92   return builtin_decl_implicit (fcode);
  93 }
  94
  95 /* Check as to whether EXPR refers to a store to vptr.  */
  96
  97 static tree
  98 is_vptr_store (gimple stmt, tree expr, bool is_write)
  99 {
 100   if (is_write == true
 101       && gimple_assign_single_p (stmt)
 102       && TREE_CODE (expr) == COMPONENT_REF)
 103     {
 104       tree field = TREE_OPERAND (expr, 1);
 105       if (TREE_CODE (field) == FIELD_DECL
 106           && DECL_VIRTUAL_P (field))
 107         return gimple_assign_rhs1 (stmt);
 108     }
 109   return NULL;
 110 }
 111
 112 /* Instruments EXPR if needed. If any instrumentation is inserted,
 113    return true.  */
 114
 115 static bool
 116 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 117 {
 118   tree base, rhs, expr_ptr, builtin_decl;
 119   basic_block bb;
 120   HOST_WIDE_INT size;
 121   gimple stmt, g;
 122   gimple_seq seq;
 123   location_t loc;
 124
 125   size = int_size_in_bytes (TREE_TYPE (expr));
 126   if (size == -1)
 127     return false;
 128
 129   /* For now just avoid instrumenting bit field acceses.
 130      TODO: handle bit-fields as if touching the whole field.  */
 131   HOST_WIDE_INT bitsize, bitpos;
 132   tree offset;
 133   machine_mode mode;
 134   int volatilep = 0, unsignedp = 0;
 135   base = get_inner_reference (expr, &bitsize, &bitpos, &offset,
 136                               &mode, &unsignedp, &volatilep, false);
 137
 138   /* No need to instrument accesses to decls that don't escape,
 139      they can't escape to other threads then.  */
 140   if (DECL_P (base))
 141     {
 142       struct pt_solution pt;
 143       memset (&pt, 0, sizeof (pt));
 144       pt.escaped = 1;
 145       pt.ipa_escaped = flag_ipa_pta != 0;
 146       pt.nonlocal = 1;
 147       if (!pt_solution_includes (&pt, base))
 148         return false;
 149       if (!is_global_var (base) && !may_be_aliased (base))
 150         return false;
 151     }
 152
 153   if (TREE_READONLY (base)
 154       || (TREE_CODE (base) == VAR_DECL
 155           && DECL_HARD_REGISTER (base)))
 156     return false;
 157
 158   if (size == 0
 159       || bitpos % (size * BITS_PER_UNIT)
 160       || bitsize != size * BITS_PER_UNIT)
 161     return false;
 162
 163   stmt = gsi_stmt (gsi);
 164   loc = gimple_location (stmt);
 165   rhs = is_vptr_store (stmt, expr, is_write);
 166   gcc_checking_assert (rhs != NULL || is_gimple_addressable (expr));
 167   expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 168   seq = NULL;
 169   if (!is_gimple_val (expr_ptr))
 170     {
 171       g = gimple_build_assign (make_ssa_name (TREE_TYPE (expr_ptr), NULL),
 172                                expr_ptr);
 173       expr_ptr = gimple_assign_lhs (g);
 174       gimple_set_location (g, loc);
 175       gimple_seq_add_stmt_without_update (&seq, g);
 176     }
 177   if (rhs == NULL)
 178     g = gimple_build_call (get_memory_access_decl (is_write, size),
 179                            1, expr_ptr);
 180   else
 181     {
 182       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 183       g = gimple_build_call (builtin_decl, 1, expr_ptr);
 184     }
 185   gimple_set_location (g, loc);
 186   gimple_seq_add_stmt_without_update (&seq, g);
 187   /* Instrumentation for assignment of a function result
 188      must be inserted after the call.  Instrumentation for
 189      reads of function arguments must be inserted before the call.
 190      That's because the call can contain synchronization.  */
 191   if (is_gimple_call (stmt) && is_write)
 192     {
 193       /* If the call can throw, it must be the last stmt in
 194          a basic block, so the instrumented stmts need to be
 195          inserted in successor bbs.  */
 196       if (is_ctrl_altering_stmt (stmt))
 197         {
 198           edge e;
 199
 200           bb = gsi_bb (gsi);
 201           e = find_fallthru_edge (bb->succs);
 202           if (e)
 203             gsi_insert_seq_on_edge_immediate (e, seq);
 204         }
 205       else
 206         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 207     }
 208   else
 209     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 210
 211   return true;
 212 }
 213
 214 /* Actions for sync/atomic builtin transformations.  */
 215 enum tsan_atomic_action
 216 {
 217   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 218   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 219 };
 220
 221 /* Table how to map sync/atomic builtins to their corresponding
 222    tsan equivalents.  */
 223 static const struct tsan_map_atomic
 224 {
 225   enum built_in_function fcode, tsan_fcode;
 226   enum tsan_atomic_action action;
 227   enum tree_code code;
 228 } tsan_atomic_table[] =
 229 {
 230 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 231   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 232 #define CHECK_LAST(fcode, tsan_fcode) \
 233   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 234 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 235   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 236 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 237   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 238 #define WEAK_CAS(fcode, tsan_fcode) \
 239   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 240 #define STRONG_CAS(fcode, tsan_fcode) \
 241   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 242 #define BOOL_CAS(fcode, tsan_fcode) \
 243   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 244 #define VAL_CAS(fcode, tsan_fcode) \
 245   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 246 #define LOCK_RELEASE(fcode, tsan_fcode) \
 247   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 248 #define FETCH_OP(fcode, tsan_fcode, code) \
 249   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 250 #define FETCH_OPS(fcode, tsan_fcode, code) \
 251   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 252
 253   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 254   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 255   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 256   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 257   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 258   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 259   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 260   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 261   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 262   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 263   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 264   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 265   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 266   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 267   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 268   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 269   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 270   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 271   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 272   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 273   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 274   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 275   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 276   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 277   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 278   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 279   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 280   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 281   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 282   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 283   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 284   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 285   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 286   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 287   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 288   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 289   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 290   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 291   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 292   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 293   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 294   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 295   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 296   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 297   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 298
 299   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 300   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 301
 302   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 303   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 304   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 305   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 306   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 307   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 308   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 309   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 310   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 311   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 312   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 313   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 314   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 315   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 316   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 317   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 318   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 319   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 320   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 321   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 322   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 323   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 324   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 325   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 326   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 327   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 328   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 329   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 330   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 331   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 332
 333   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 334   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 335   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 336   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 337   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 338
 339   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 340   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 341   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 342   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 343   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 344   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 345   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 346   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 347   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 348   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 349   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 350   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 351   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 352   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 353   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 354   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 355   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 356   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 357   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 358   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 359   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 360   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 361   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 362   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 363   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 364   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 365   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 366   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 367   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 368   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 369
 370   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 371
 372   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 373   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 374   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 375   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 376   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 377   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 378   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 379   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 380   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 381   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 382   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 383   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 384   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 385   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 386   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 387   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 388   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 389   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 390   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 391   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 392   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 393   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 394   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 395   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 396   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 397   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 398   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 399   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 400   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 401   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 402
 403   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 404   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 405   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 406   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 407   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 408
 409   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 410   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 411               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 412   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 413               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 414   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 415               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 416   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 417               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 418
 419   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 420             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 421   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 422             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 423   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 424             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 425   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 426             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 427   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 428             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 429
 430   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 431   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 432   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 433   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 434   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 435            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 436
 437   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 438   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 439   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 440   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 441   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE)
 442 };
 443
 444 /* Instrument an atomic builtin.  */
 445
 446 static void
 447 instrument_builtin_call (gimple_stmt_iterator *gsi)
 448 {
 449   gimple stmt = gsi_stmt (*gsi), g;
 450   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 451   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 452   unsigned int i, num = gimple_call_num_args (stmt), j;
 453   for (j = 0; j < 6 && j < num; j++)
 454     args[j] = gimple_call_arg (stmt, j);
 455   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 456     if (fcode != tsan_atomic_table[i].fcode)
 457       continue;
 458     else
 459       {
 460         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 461         if (decl == NULL_TREE)
 462           return;
 463         switch (tsan_atomic_table[i].action)
 464           {
 465           case check_last:
 466           case fetch_op:
 467             last_arg = gimple_call_arg (stmt, num - 1);
 468             if (!tree_fits_uhwi_p (last_arg)
 469                 || tree_to_uhwi (last_arg) > MEMMODEL_SEQ_CST)
 470               return;
 471             gimple_call_set_fndecl (stmt, decl);
 472             update_stmt (stmt);
 473             if (tsan_atomic_table[i].action == fetch_op)
 474               {
 475                 args[1] = gimple_call_arg (stmt, 1);
 476                 goto adjust_result;
 477               }
 478             return;
 479           case add_seq_cst:
 480           case add_acquire:
 481           case fetch_op_seq_cst:
 482             gcc_assert (num <= 2);
 483             for (j = 0; j < num; j++)
 484               args[j] = gimple_call_arg (stmt, j);
 485             for (; j < 2; j++)
 486               args[j] = NULL_TREE;
 487             args[num] = build_int_cst (NULL_TREE,
 488                                        tsan_atomic_table[i].action
 489                                        != add_acquire
 490                                        ? MEMMODEL_SEQ_CST
 491                                        : MEMMODEL_ACQUIRE);
 492             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 493             stmt = gsi_stmt (*gsi);
 494             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 495               {
 496               adjust_result:
 497                 lhs = gimple_call_lhs (stmt);
 498                 if (lhs == NULL_TREE)
 499                   return;
 500                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 501                                                 TREE_TYPE (args[1])))
 502                   {
 503                     tree var = make_ssa_name (TREE_TYPE (lhs), NULL);
 504                     g = gimple_build_assign_with_ops (NOP_EXPR, var,
 505                                                       args[1], NULL_TREE);
 506                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 507                     args[1] = var;
 508                   }
 509                 gimple_call_set_lhs (stmt,
 510                                      make_ssa_name (TREE_TYPE (lhs), NULL));
 511                 /* BIT_NOT_EXPR stands for NAND.  */
 512                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 513                   {
 514                     tree var = make_ssa_name (TREE_TYPE (lhs), NULL);
 515                     g = gimple_build_assign_with_ops (BIT_AND_EXPR, var,
 516                                                       gimple_call_lhs (stmt),
 517                                                       args[1]);
 518                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 519                     g = gimple_build_assign_with_ops (BIT_NOT_EXPR, lhs, var,
 520                                                       NULL_TREE);
 521                   }
 522                 else
 523                   g = gimple_build_assign_with_ops (tsan_atomic_table[i].code,
 524                                                     lhs,
 525                                                     gimple_call_lhs (stmt),
 526                                                     args[1]);
 527                 update_stmt (stmt);
 528                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 529               }
 530             return;
 531           case weak_cas:
 532             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 533               continue;
 534             /* FALLTHRU */
 535           case strong_cas:
 536             gcc_assert (num == 6);
 537             for (j = 0; j < 6; j++)
 538               args[j] = gimple_call_arg (stmt, j);
 539             if (!tree_fits_uhwi_p (args[4])
 540                 || tree_to_uhwi (args[4]) > MEMMODEL_SEQ_CST)
 541               return;
 542             if (!tree_fits_uhwi_p (args[5])
 543                 || tree_to_uhwi (args[5]) > MEMMODEL_SEQ_CST)
 544               return;
 545             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 546                                 args[4], args[5]);
 547             return;
 548           case bool_cas:
 549           case val_cas:
 550             gcc_assert (num == 3);
 551             for (j = 0; j < 3; j++)
 552               args[j] = gimple_call_arg (stmt, j);
 553             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 554             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 555             t = create_tmp_var (t, NULL);
 556             mark_addressable (t);
 557             if (!useless_type_conversion_p (TREE_TYPE (t),
 558                                             TREE_TYPE (args[1])))
 559               {
 560                 g = gimple_build_assign_with_ops (NOP_EXPR,
 561                                                   make_ssa_name (TREE_TYPE (t),
 562                                                                  NULL),
 563                                                   args[1], NULL_TREE);
 564                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 565                 args[1] = gimple_assign_lhs (g);
 566               }
 567             g = gimple_build_assign (t, args[1]);
 568             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 569             lhs = gimple_call_lhs (stmt);
 570             update_gimple_call (gsi, decl, 5, args[0],
 571                                 build_fold_addr_expr (t), args[2],
 572                                 build_int_cst (NULL_TREE,
 573                                                MEMMODEL_SEQ_CST),
 574                                 build_int_cst (NULL_TREE,
 575                                                MEMMODEL_SEQ_CST));
 576             if (tsan_atomic_table[i].action == val_cas && lhs)
 577               {
 578                 tree cond;
 579                 stmt = gsi_stmt (*gsi);
 580                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t), NULL),
 581                                          t);
 582                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 583                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 584                 cond = build2 (NE_EXPR, boolean_type_node, t,
 585                                build_int_cst (TREE_TYPE (t), 0));
 586                 g = gimple_build_assign_with_ops (COND_EXPR, lhs, cond,
 587                                                   args[1],
 588                                                   gimple_assign_lhs (g));
 589                 gimple_call_set_lhs (stmt, t);
 590                 update_stmt (stmt);
 591                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 592               }
 593             return;
 594           case lock_release:
 595             gcc_assert (num == 1);
 596             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 597             t = TREE_VALUE (TREE_CHAIN (t));
 598             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 599                                 build_int_cst (t, 0),
 600                                 build_int_cst (NULL_TREE,
 601                                                MEMMODEL_RELEASE));
 602             return;
 603           default:
 604             continue;
 605           }
 606       }
 607 }
 608
 609 /* Instruments the gimple pointed to by GSI. Return
 610    true if func entry/exit should be instrumented.  */
 611
 612 static bool
 613 instrument_gimple (gimple_stmt_iterator *gsi)
 614 {
 615   gimple stmt;
 616   tree rhs, lhs;
 617   bool instrumented = false;
 618
 619   stmt = gsi_stmt (*gsi);
 620   if (is_gimple_call (stmt)
 621       && (gimple_call_fndecl (stmt)
 622           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 623     {
 624       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 625         instrument_builtin_call (gsi);
 626       return true;
 627     }
 628   else if (is_gimple_assign (stmt)
 629            && !gimple_clobber_p (stmt))
 630     {
 631       if (gimple_store_p (stmt))
 632         {
 633           lhs = gimple_assign_lhs (stmt);
 634           instrumented = instrument_expr (*gsi, lhs, true);
 635         }
 636       if (gimple_assign_load_p (stmt))
 637         {
 638           rhs = gimple_assign_rhs1 (stmt);
 639           instrumented = instrument_expr (*gsi, rhs, false);
 640         }
 641     }
 642   return instrumented;
 643 }
 644
 645 /* Instruments all interesting memory accesses in the current function.
 646    Return true if func entry/exit should be instrumented.  */
 647
 648 static bool
 649 instrument_memory_accesses (void)
 650 {
 651   basic_block bb;
 652   gimple_stmt_iterator gsi;
 653   bool fentry_exit_instrument = false;
 654
 655   FOR_EACH_BB_FN (bb, cfun)
 656     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 657       fentry_exit_instrument |= instrument_gimple (&gsi);
 658   return fentry_exit_instrument;
 659 }
 660
 661 /* Instruments function entry.  */
 662
 663 static void
 664 instrument_func_entry (void)
 665 {
 666   basic_block succ_bb;
 667   gimple_stmt_iterator gsi;
 668   tree ret_addr, builtin_decl;
 669   gimple g;
 670
 671   succ_bb = single_succ (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 672   gsi = gsi_after_labels (succ_bb);
 673
 674   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 675   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 676   ret_addr = make_ssa_name (ptr_type_node, NULL);
 677   gimple_call_set_lhs (g, ret_addr);
 678   gimple_set_location (g, cfun->function_start_locus);
 679   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 680
 681   builtin_decl =  builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 682   g = gimple_build_call (builtin_decl, 1, ret_addr);
 683   gimple_set_location (g, cfun->function_start_locus);
 684   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 685 }
 686
 687 /* Instruments function exits.  */
 688
 689 static void
 690 instrument_func_exit (void)
 691 {
 692   location_t loc;
 693   basic_block exit_bb;
 694   gimple_stmt_iterator gsi;
 695   gimple stmt, g;
 696   tree builtin_decl;
 697   edge e;
 698   edge_iterator ei;
 699
 700   /* Find all function exits.  */
 701   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 702   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 703     {
 704       gsi = gsi_last_bb (e->src);
 705       stmt = gsi_stmt (gsi);
 706       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 707                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 708       loc = gimple_location (stmt);
 709       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 710       g = gimple_build_call (builtin_decl, 0);
 711       gimple_set_location (g, loc);
 712       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 713     }
 714 }
 715
 716 /* ThreadSanitizer instrumentation pass.  */
 717
 718 static unsigned
 719 tsan_pass (void)
 720 {
 721   initialize_sanitizer_builtins ();
 722   if (instrument_memory_accesses ())
 723     {
 724       instrument_func_entry ();
 725       instrument_func_exit ();
 726     }
 727   return 0;
 728 }
 729
 730 /* Inserts __tsan_init () into the list of CTORs.  */
 731
 732 void
 733 tsan_finish_file (void)
 734 {
 735   tree ctor_statements = NULL_TREE;
 736
 737   initialize_sanitizer_builtins ();
 738   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 739   append_to_statement_list (build_call_expr (init_decl, 0),
 740                             &ctor_statements);
 741   cgraph_build_static_cdtor ('I', ctor_statements,
 742                              MAX_RESERVED_INIT_PRIORITY - 1);
 743 }
 744
 745 /* The pass descriptor.  */
 746
 747 namespace {
 748
 749 const pass_data pass_data_tsan =
 750 {
 751   GIMPLE_PASS, /* type */
 752   "tsan", /* name */
 753   OPTGROUP_NONE, /* optinfo_flags */
 754   TV_NONE, /* tv_id */
 755   ( PROP_ssa | PROP_cfg ), /* properties_required */
 756   0, /* properties_provided */
 757   0, /* properties_destroyed */
 758   0, /* todo_flags_start */
 759   TODO_update_ssa, /* todo_flags_finish */
 760 };
 761
 762 class pass_tsan : public gimple_opt_pass
 763 {
 764 public:
 765   pass_tsan (gcc::context *ctxt)
 766     : gimple_opt_pass (pass_data_tsan, ctxt)
 767   {}
 768
 769   /* opt_pass methods: */
 770   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 771   virtual bool gate (function *)
 772 {
 773   return (flag_sanitize & SANITIZE_THREAD) != 0;
 774 }
 775
 776   virtual unsigned int execute (function *) { return tsan_pass (); }
 777
 778 }; // class pass_tsan
 779
 780 } // anon namespace
 781
 782 gimple_opt_pass *
 783 make_pass_tsan (gcc::context *ctxt)
 784 {
 785   return new pass_tsan (ctxt);
 786 }
 787
 788 namespace {
 789
 790 const pass_data pass_data_tsan_O0 =
 791 {
 792   GIMPLE_PASS, /* type */
 793   "tsan0", /* name */
 794   OPTGROUP_NONE, /* optinfo_flags */
 795   TV_NONE, /* tv_id */
 796   ( PROP_ssa | PROP_cfg ), /* properties_required */
 797   0, /* properties_provided */
 798   0, /* properties_destroyed */
 799   0, /* todo_flags_start */
 800   TODO_update_ssa, /* todo_flags_finish */
 801 };
 802
 803 class pass_tsan_O0 : public gimple_opt_pass
 804 {
 805 public:
 806   pass_tsan_O0 (gcc::context *ctxt)
 807     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 808   {}
 809
 810   /* opt_pass methods: */
 811   virtual bool gate (function *)
 812     {
 813       return (flag_sanitize & SANITIZE_THREAD) != 0 && !optimize;
 814     }
 815
 816   virtual unsigned int execute (function *) { return tsan_pass (); }
 817
 818 }; // class pass_tsan_O0
 819
 820 } // anon namespace
 821
 822 gimple_opt_pass *
 823 make_pass_tsan_O0 (gcc::context *ctxt)
 824 {
 825   return new pass_tsan_O0 (ctxt);
 826 }