gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2016 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 "backend.h"
  26 #include "rtl.h"
  27 #include "tree.h"
  28 #include "gimple.h"
  29 #include "tree-pass.h"
  30 #include "ssa.h"
  31 #include "cgraph.h"
  32 #include "fold-const.h"
  33 #include "gimplify.h"
  34 #include "gimple-iterator.h"
  35 #include "gimplify-me.h"
  36 #include "tree-cfg.h"
  37 #include "tree-iterator.h"
  38 #include "tree-ssa-propagate.h"
  39 #include "tree-ssa-loop-ivopts.h"
  40 #include "tsan.h"
  41 #include "asan.h"
  42 #include "builtins.h"
  43
  44 /* Number of instrumented memory accesses in the current function.  */
  45
  46 /* Builds the following decl
  47    void __tsan_read/writeX (void *addr);  */
  48
  49 static tree
  50 get_memory_access_decl (bool is_write, unsigned size)
  51 {
  52   enum built_in_function fcode;
  53
  54   if (size <= 1)
  55     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  56                      : BUILT_IN_TSAN_READ1;
  57   else if (size <= 3)
  58     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  59                      : BUILT_IN_TSAN_READ2;
  60   else if (size <= 7)
  61     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  62                      : BUILT_IN_TSAN_READ4;
  63   else if (size <= 15)
  64     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  65                      : BUILT_IN_TSAN_READ8;
  66   else
  67     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  68                      : BUILT_IN_TSAN_READ16;
  69
  70   return builtin_decl_implicit (fcode);
  71 }
  72
  73 /* Check as to whether EXPR refers to a store to vptr.  */
  74
  75 static tree
  76 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  77 {
  78   if (is_write == true
  79       && gimple_assign_single_p (stmt)
  80       && TREE_CODE (expr) == COMPONENT_REF)
  81     {
  82       tree field = TREE_OPERAND (expr, 1);
  83       if (TREE_CODE (field) == FIELD_DECL
  84           && DECL_VIRTUAL_P (field))
  85         return gimple_assign_rhs1 (stmt);
  86     }
  87   return NULL;
  88 }
  89
  90 /* Instruments EXPR if needed. If any instrumentation is inserted,
  91    return true.  */
  92
  93 static bool
  94 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
  95 {
  96   tree base, rhs, expr_ptr, builtin_decl;
  97   basic_block bb;
  98   HOST_WIDE_INT size;
  99   gimple *stmt, *g;
 100   gimple_seq seq;
 101   location_t loc;
 102   unsigned int align;
 103
 104   size = int_size_in_bytes (TREE_TYPE (expr));
 105   if (size <= 0)
 106     return false;
 107
 108   HOST_WIDE_INT bitsize, bitpos;
 109   tree offset;
 110   machine_mode mode;
 111   int unsignedp, reversep, volatilep = 0;
 112   base = get_inner_reference (expr, &bitsize, &bitpos, &offset, &mode,
 113                               &unsignedp, &reversep, &volatilep, false);
 114
 115   /* No need to instrument accesses to decls that don't escape,
 116      they can't escape to other threads then.  */
 117   if (DECL_P (base) && !is_global_var (base))
 118     {
 119       struct pt_solution pt;
 120       memset (&pt, 0, sizeof (pt));
 121       pt.escaped = 1;
 122       pt.ipa_escaped = flag_ipa_pta != 0;
 123       if (!pt_solution_includes (&pt, base))
 124         return false;
 125       if (!may_be_aliased (base))
 126         return false;
 127     }
 128
 129   if (TREE_READONLY (base)
 130       || (TREE_CODE (base) == VAR_DECL
 131           && DECL_HARD_REGISTER (base)))
 132     return false;
 133
 134   stmt = gsi_stmt (gsi);
 135   loc = gimple_location (stmt);
 136   rhs = is_vptr_store (stmt, expr, is_write);
 137
 138   if ((TREE_CODE (expr) == COMPONENT_REF
 139        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 140       || TREE_CODE (expr) == BIT_FIELD_REF)
 141     {
 142       base = TREE_OPERAND (expr, 0);
 143       if (TREE_CODE (expr) == COMPONENT_REF)
 144         {
 145           expr = TREE_OPERAND (expr, 1);
 146           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 147             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 148           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 149               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 150               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 151             return false;
 152           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 153                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 154           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 155         }
 156       else
 157         {
 158           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 159               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 160             return false;
 161           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 162           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 163         }
 164       if (bitpos < 0 || bitsize <= 0)
 165         return false;
 166       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 167              / BITS_PER_UNIT;
 168       if (may_be_nonaddressable_p (base))
 169         return false;
 170       align = get_object_alignment (base);
 171       if (align < BITS_PER_UNIT)
 172         return false;
 173       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 174       if ((align - 1) & bitpos)
 175         {
 176           align = (align - 1) & bitpos;
 177           align = align & -align;
 178         }
 179       expr = build_fold_addr_expr (unshare_expr (base));
 180       expr = build2 (MEM_REF, char_type_node, expr,
 181                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 182       expr_ptr = build_fold_addr_expr (expr);
 183     }
 184   else
 185     {
 186       if (may_be_nonaddressable_p (expr))
 187         return false;
 188       align = get_object_alignment (expr);
 189       if (align < BITS_PER_UNIT)
 190         return false;
 191       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 192     }
 193   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 194   if ((size & (size - 1)) != 0 || size > 16
 195       || align < MIN (size, 8) * BITS_PER_UNIT)
 196     {
 197       builtin_decl = builtin_decl_implicit (is_write
 198                                             ? BUILT_IN_TSAN_WRITE_RANGE
 199                                             : BUILT_IN_TSAN_READ_RANGE);
 200       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 201     }
 202   else if (rhs == NULL)
 203     g = gimple_build_call (get_memory_access_decl (is_write, size),
 204                            1, expr_ptr);
 205   else
 206     {
 207       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 208       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 209     }
 210   gimple_set_location (g, loc);
 211   gimple_seq_add_stmt_without_update (&seq, g);
 212   /* Instrumentation for assignment of a function result
 213      must be inserted after the call.  Instrumentation for
 214      reads of function arguments must be inserted before the call.
 215      That's because the call can contain synchronization.  */
 216   if (is_gimple_call (stmt) && is_write)
 217     {
 218       /* If the call can throw, it must be the last stmt in
 219          a basic block, so the instrumented stmts need to be
 220          inserted in successor bbs.  */
 221       if (is_ctrl_altering_stmt (stmt))
 222         {
 223           edge e;
 224
 225           bb = gsi_bb (gsi);
 226           e = find_fallthru_edge (bb->succs);
 227           if (e)
 228             gsi_insert_seq_on_edge_immediate (e, seq);
 229         }
 230       else
 231         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 232     }
 233   else
 234     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 235
 236   return true;
 237 }
 238
 239 /* Actions for sync/atomic builtin transformations.  */
 240 enum tsan_atomic_action
 241 {
 242   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 243   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 244 };
 245
 246 /* Table how to map sync/atomic builtins to their corresponding
 247    tsan equivalents.  */
 248 static const struct tsan_map_atomic
 249 {
 250   enum built_in_function fcode, tsan_fcode;
 251   enum tsan_atomic_action action;
 252   enum tree_code code;
 253 } tsan_atomic_table[] =
 254 {
 255 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 256   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 257 #define CHECK_LAST(fcode, tsan_fcode) \
 258   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 259 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 260   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 261 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 262   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 263 #define WEAK_CAS(fcode, tsan_fcode) \
 264   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 265 #define STRONG_CAS(fcode, tsan_fcode) \
 266   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 267 #define BOOL_CAS(fcode, tsan_fcode) \
 268   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 269 #define VAL_CAS(fcode, tsan_fcode) \
 270   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 271 #define LOCK_RELEASE(fcode, tsan_fcode) \
 272   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 273 #define FETCH_OP(fcode, tsan_fcode, code) \
 274   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 275 #define FETCH_OPS(fcode, tsan_fcode, code) \
 276   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 277
 278   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 279   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 280   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 281   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 282   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 283   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 284   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 285   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 286   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 287   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 288   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 289   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 290   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 291   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 292   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 293   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 294   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 295   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 296   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 297   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 298   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 299   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 300   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 301   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 302   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 303   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 304   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 305   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 306   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 307   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 308   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 309   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 310   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 311   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 312   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 313   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 314   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 315   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 316   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 317   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 318   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 319   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 320   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 321   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 322   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 323
 324   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 325   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 326
 327   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 328   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 329   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 330   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 331   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 332   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 333   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 334   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 335   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 336   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 337   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 338   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 339   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 340   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 341   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 342   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 343   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 344   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 345   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 346   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 347   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 348   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 349   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 350   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 351   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 352   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 353   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 354   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 355   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 356   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 357
 358   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 359   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 360   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 361   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 362   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 363
 364   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 365   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 366   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 367   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 368   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 369   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 370   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 371   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 372   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 373   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 374   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 375   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 376   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 377   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 378   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 379   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 380   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 381   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 382   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 383   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 384   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 385   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 386   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 387   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 388   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 389   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 390   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 391   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 392   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 393   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 394
 395   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 396
 397   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 398   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 399   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 400   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 401   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 402   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 403   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 404   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 405   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 406   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 407   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 408   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 409   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 410   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 411   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 412   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 413   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 414   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 415   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 416   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 417   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 418   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 419   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 420   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 421   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 422   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 423   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 424   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 425   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 426   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 427
 428   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 429   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 430   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 431   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 432   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 433
 434   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 435   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 436               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 437   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 438               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 439   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 440               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 441   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 442               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 443
 444   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 445             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 446   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 447             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 448   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 449             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 450   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 451             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 452   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 453             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 454
 455   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 456   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 457   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 458   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 459   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 460            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 461
 462   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 463   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 464   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 465   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 466   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE)
 467 };
 468
 469 /* Instrument an atomic builtin.  */
 470
 471 static void
 472 instrument_builtin_call (gimple_stmt_iterator *gsi)
 473 {
 474   gimple *stmt = gsi_stmt (*gsi), *g;
 475   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 476   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 477   unsigned int i, num = gimple_call_num_args (stmt), j;
 478   for (j = 0; j < 6 && j < num; j++)
 479     args[j] = gimple_call_arg (stmt, j);
 480   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 481     if (fcode != tsan_atomic_table[i].fcode)
 482       continue;
 483     else
 484       {
 485         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 486         if (decl == NULL_TREE)
 487           return;
 488         switch (tsan_atomic_table[i].action)
 489           {
 490           case check_last:
 491           case fetch_op:
 492             last_arg = gimple_call_arg (stmt, num - 1);
 493             if (!tree_fits_uhwi_p (last_arg)
 494                 || memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 495               return;
 496             gimple_call_set_fndecl (stmt, decl);
 497             update_stmt (stmt);
 498             if (tsan_atomic_table[i].action == fetch_op)
 499               {
 500                 args[1] = gimple_call_arg (stmt, 1);
 501                 goto adjust_result;
 502               }
 503             return;
 504           case add_seq_cst:
 505           case add_acquire:
 506           case fetch_op_seq_cst:
 507             gcc_assert (num <= 2);
 508             for (j = 0; j < num; j++)
 509               args[j] = gimple_call_arg (stmt, j);
 510             for (; j < 2; j++)
 511               args[j] = NULL_TREE;
 512             args[num] = build_int_cst (NULL_TREE,
 513                                        tsan_atomic_table[i].action
 514                                        != add_acquire
 515                                        ? MEMMODEL_SEQ_CST
 516                                        : MEMMODEL_ACQUIRE);
 517             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 518             stmt = gsi_stmt (*gsi);
 519             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 520               {
 521               adjust_result:
 522                 lhs = gimple_call_lhs (stmt);
 523                 if (lhs == NULL_TREE)
 524                   return;
 525                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 526                                                 TREE_TYPE (args[1])))
 527                   {
 528                     tree var = make_ssa_name (TREE_TYPE (lhs));
 529                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 530                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 531                     args[1] = var;
 532                   }
 533                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 534                 /* BIT_NOT_EXPR stands for NAND.  */
 535                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 536                   {
 537                     tree var = make_ssa_name (TREE_TYPE (lhs));
 538                     g = gimple_build_assign (var, BIT_AND_EXPR,
 539                                              gimple_call_lhs (stmt), args[1]);
 540                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 541                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 542                   }
 543                 else
 544                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 545                                            gimple_call_lhs (stmt), args[1]);
 546                 update_stmt (stmt);
 547                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 548               }
 549             return;
 550           case weak_cas:
 551             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 552               continue;
 553             /* FALLTHRU */
 554           case strong_cas:
 555             gcc_assert (num == 6);
 556             for (j = 0; j < 6; j++)
 557               args[j] = gimple_call_arg (stmt, j);
 558             if (!tree_fits_uhwi_p (args[4])
 559                 || memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 560               return;
 561             if (!tree_fits_uhwi_p (args[5])
 562                 || memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 563               return;
 564             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 565                                 args[4], args[5]);
 566             return;
 567           case bool_cas:
 568           case val_cas:
 569             gcc_assert (num == 3);
 570             for (j = 0; j < 3; j++)
 571               args[j] = gimple_call_arg (stmt, j);
 572             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 573             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 574             t = create_tmp_var (t);
 575             mark_addressable (t);
 576             if (!useless_type_conversion_p (TREE_TYPE (t),
 577                                             TREE_TYPE (args[1])))
 578               {
 579                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 580                                          NOP_EXPR, args[1]);
 581                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 582                 args[1] = gimple_assign_lhs (g);
 583               }
 584             g = gimple_build_assign (t, args[1]);
 585             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 586             lhs = gimple_call_lhs (stmt);
 587             update_gimple_call (gsi, decl, 5, args[0],
 588                                 build_fold_addr_expr (t), args[2],
 589                                 build_int_cst (NULL_TREE,
 590                                                MEMMODEL_SEQ_CST),
 591                                 build_int_cst (NULL_TREE,
 592                                                MEMMODEL_SEQ_CST));
 593             if (tsan_atomic_table[i].action == val_cas && lhs)
 594               {
 595                 tree cond;
 596                 stmt = gsi_stmt (*gsi);
 597                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 598                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 599                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 600                 cond = build2 (NE_EXPR, boolean_type_node, t,
 601                                build_int_cst (TREE_TYPE (t), 0));
 602                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 603                                          gimple_assign_lhs (g));
 604                 gimple_call_set_lhs (stmt, t);
 605                 update_stmt (stmt);
 606                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 607               }
 608             return;
 609           case lock_release:
 610             gcc_assert (num == 1);
 611             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 612             t = TREE_VALUE (TREE_CHAIN (t));
 613             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 614                                 build_int_cst (t, 0),
 615                                 build_int_cst (NULL_TREE,
 616                                                MEMMODEL_RELEASE));
 617             return;
 618           default:
 619             continue;
 620           }
 621       }
 622 }
 623
 624 /* Instruments the gimple pointed to by GSI. Return
 625    true if func entry/exit should be instrumented.  */
 626
 627 static bool
 628 instrument_gimple (gimple_stmt_iterator *gsi)
 629 {
 630   gimple *stmt;
 631   tree rhs, lhs;
 632   bool instrumented = false;
 633
 634   stmt = gsi_stmt (*gsi);
 635   if (is_gimple_call (stmt)
 636       && (gimple_call_fndecl (stmt)
 637           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 638     {
 639       /* All functions with function call will have exit instrumented,
 640          therefore no function calls other than __tsan_func_exit
 641          shall appear in the functions.  */
 642       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 643       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 644         instrument_builtin_call (gsi);
 645       return true;
 646     }
 647   else if (is_gimple_assign (stmt)
 648            && !gimple_clobber_p (stmt))
 649     {
 650       if (gimple_store_p (stmt))
 651         {
 652           lhs = gimple_assign_lhs (stmt);
 653           instrumented = instrument_expr (*gsi, lhs, true);
 654         }
 655       if (gimple_assign_load_p (stmt))
 656         {
 657           rhs = gimple_assign_rhs1 (stmt);
 658           instrumented = instrument_expr (*gsi, rhs, false);
 659         }
 660     }
 661   return instrumented;
 662 }
 663
 664 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 665
 666 static void
 667 replace_func_exit (gimple *stmt)
 668 {
 669   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 670   gimple *g = gimple_build_call (builtin_decl, 0);
 671   gimple_set_location (g, cfun->function_end_locus);
 672   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 673   gsi_replace (&gsi, g, true);
 674 }
 675
 676 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 677
 678 static void
 679 instrument_func_exit (void)
 680 {
 681   location_t loc;
 682   basic_block exit_bb;
 683   gimple_stmt_iterator gsi;
 684   gimple *stmt, *g;
 685   tree builtin_decl;
 686   edge e;
 687   edge_iterator ei;
 688
 689   /* Find all function exits.  */
 690   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 691   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 692     {
 693       gsi = gsi_last_bb (e->src);
 694       stmt = gsi_stmt (gsi);
 695       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 696                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 697       loc = gimple_location (stmt);
 698       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 699       g = gimple_build_call (builtin_decl, 0);
 700       gimple_set_location (g, loc);
 701       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 702     }
 703 }
 704
 705 /* Instruments all interesting memory accesses in the current function.
 706    Return true if func entry/exit should be instrumented.  */
 707
 708 static bool
 709 instrument_memory_accesses (void)
 710 {
 711   basic_block bb;
 712   gimple_stmt_iterator gsi;
 713   bool fentry_exit_instrument = false;
 714   bool func_exit_seen = false;
 715   auto_vec<gimple *> tsan_func_exits;
 716
 717   FOR_EACH_BB_FN (bb, cfun)
 718     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 719       {
 720         gimple *stmt = gsi_stmt (gsi);
 721         if (is_gimple_call (stmt)
 722             && gimple_call_internal_p (stmt)
 723             && gimple_call_internal_fn (stmt) == IFN_TSAN_FUNC_EXIT)
 724           {
 725             if (fentry_exit_instrument)
 726               replace_func_exit (stmt);
 727             else
 728               tsan_func_exits.safe_push (stmt);
 729             func_exit_seen = true;
 730           }
 731         else
 732           fentry_exit_instrument |= instrument_gimple (&gsi);
 733       }
 734   unsigned int i;
 735   gimple *stmt;
 736   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 737     if (fentry_exit_instrument)
 738       replace_func_exit (stmt);
 739     else
 740       {
 741         gsi = gsi_for_stmt (stmt);
 742         gsi_remove (&gsi, true);
 743       }
 744   if (fentry_exit_instrument && !func_exit_seen)
 745     instrument_func_exit ();
 746   return fentry_exit_instrument;
 747 }
 748
 749 /* Instruments function entry.  */
 750
 751 static void
 752 instrument_func_entry (void)
 753 {
 754   tree ret_addr, builtin_decl;
 755   gimple *g;
 756   gimple_seq seq = NULL;
 757
 758   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 759   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 760   ret_addr = make_ssa_name (ptr_type_node);
 761   gimple_call_set_lhs (g, ret_addr);
 762   gimple_set_location (g, cfun->function_start_locus);
 763   gimple_seq_add_stmt_without_update (&seq, g);
 764
 765   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 766   g = gimple_build_call (builtin_decl, 1, ret_addr);
 767   gimple_set_location (g, cfun->function_start_locus);
 768   gimple_seq_add_stmt_without_update (&seq, g);
 769
 770   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 771   gsi_insert_seq_on_edge_immediate (e, seq);
 772 }
 773
 774 /* ThreadSanitizer instrumentation pass.  */
 775
 776 static unsigned
 777 tsan_pass (void)
 778 {
 779   initialize_sanitizer_builtins ();
 780   if (instrument_memory_accesses ())
 781     instrument_func_entry ();
 782   return 0;
 783 }
 784
 785 /* Inserts __tsan_init () into the list of CTORs.  */
 786
 787 void
 788 tsan_finish_file (void)
 789 {
 790   tree ctor_statements = NULL_TREE;
 791
 792   initialize_sanitizer_builtins ();
 793   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 794   append_to_statement_list (build_call_expr (init_decl, 0),
 795                             &ctor_statements);
 796   cgraph_build_static_cdtor ('I', ctor_statements,
 797                              MAX_RESERVED_INIT_PRIORITY - 1);
 798 }
 799
 800 /* The pass descriptor.  */
 801
 802 namespace {
 803
 804 const pass_data pass_data_tsan =
 805 {
 806   GIMPLE_PASS, /* type */
 807   "tsan", /* name */
 808   OPTGROUP_NONE, /* optinfo_flags */
 809   TV_NONE, /* tv_id */
 810   ( PROP_ssa | PROP_cfg ), /* properties_required */
 811   0, /* properties_provided */
 812   0, /* properties_destroyed */
 813   0, /* todo_flags_start */
 814   TODO_update_ssa, /* todo_flags_finish */
 815 };
 816
 817 class pass_tsan : public gimple_opt_pass
 818 {
 819 public:
 820   pass_tsan (gcc::context *ctxt)
 821     : gimple_opt_pass (pass_data_tsan, ctxt)
 822   {}
 823
 824   /* opt_pass methods: */
 825   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 826   virtual bool gate (function *)
 827 {
 828   return ((flag_sanitize & SANITIZE_THREAD) != 0
 829           && !lookup_attribute ("no_sanitize_thread",
 830                                 DECL_ATTRIBUTES (current_function_decl)));
 831 }
 832
 833   virtual unsigned int execute (function *) { return tsan_pass (); }
 834
 835 }; // class pass_tsan
 836
 837 } // anon namespace
 838
 839 gimple_opt_pass *
 840 make_pass_tsan (gcc::context *ctxt)
 841 {
 842   return new pass_tsan (ctxt);
 843 }
 844
 845 namespace {
 846
 847 const pass_data pass_data_tsan_O0 =
 848 {
 849   GIMPLE_PASS, /* type */
 850   "tsan0", /* name */
 851   OPTGROUP_NONE, /* optinfo_flags */
 852   TV_NONE, /* tv_id */
 853   ( PROP_ssa | PROP_cfg ), /* properties_required */
 854   0, /* properties_provided */
 855   0, /* properties_destroyed */
 856   0, /* todo_flags_start */
 857   TODO_update_ssa, /* todo_flags_finish */
 858 };
 859
 860 class pass_tsan_O0 : public gimple_opt_pass
 861 {
 862 public:
 863   pass_tsan_O0 (gcc::context *ctxt)
 864     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 865   {}
 866
 867   /* opt_pass methods: */
 868   virtual bool gate (function *)
 869     {
 870       return ((flag_sanitize & SANITIZE_THREAD) != 0 && !optimize
 871               && !lookup_attribute ("no_sanitize_thread",
 872                                     DECL_ATTRIBUTES (current_function_decl)));
 873     }
 874
 875   virtual unsigned int execute (function *) { return tsan_pass (); }
 876
 877 }; // class pass_tsan_O0
 878
 879 } // anon namespace
 880
 881 gimple_opt_pass *
 882 make_pass_tsan_O0 (gcc::context *ctxt)
 883 {
 884   return new pass_tsan_O0 (ctxt);
 885 }