gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2015 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 "hash-set.h"
  26 #include "machmode.h"
  27 #include "vec.h"
  28 #include "double-int.h"
  29 #include "input.h"
  30 #include "alias.h"
  31 #include "symtab.h"
  32 #include "options.h"
  33 #include "wide-int.h"
  34 #include "inchash.h"
  35 #include "tree.h"
  36 #include "fold-const.h"
  37 #include "hashtab.h"
  38 #include "tm.h"
  39 #include "hard-reg-set.h"
  40 #include "function.h"
  41 #include "rtl.h"
  42 #include "flags.h"
  43 #include "statistics.h"
  44 #include "real.h"
  45 #include "fixed-value.h"
  46 #include "insn-config.h"
  47 #include "expmed.h"
  48 #include "dojump.h"
  49 #include "explow.h"
  50 #include "calls.h"
  51 #include "emit-rtl.h"
  52 #include "varasm.h"
  53 #include "stmt.h"
  54 #include "expr.h"
  55 #include "intl.h"
  56 #include "predict.h"
  57 #include "dominance.h"
  58 #include "cfg.h"
  59 #include "basic-block.h"
  60 #include "tree-ssa-alias.h"
  61 #include "internal-fn.h"
  62 #include "gimple-expr.h"
  63 #include "is-a.h"
  64 #include "gimple.h"
  65 #include "gimplify.h"
  66 #include "gimple-iterator.h"
  67 #include "gimplify-me.h"
  68 #include "gimple-ssa.h"
  69 #include "hash-map.h"
  70 #include "plugin-api.h"
  71 #include "ipa-ref.h"
  72 #include "cgraph.h"
  73 #include "tree-cfg.h"
  74 #include "stringpool.h"
  75 #include "tree-ssanames.h"
  76 #include "tree-pass.h"
  77 #include "tree-iterator.h"
  78 #include "langhooks.h"
  79 #include "output.h"
  80 #include "target.h"
  81 #include "diagnostic.h"
  82 #include "tree-ssa-propagate.h"
  83 #include "tree-ssa-loop-ivopts.h"
  84 #include "tsan.h"
  85 #include "asan.h"
  86 #include "builtins.h"
  87
  88 /* Number of instrumented memory accesses in the current function.  */
  89
  90 /* Builds the following decl
  91    void __tsan_read/writeX (void *addr);  */
  92
  93 static tree
  94 get_memory_access_decl (bool is_write, unsigned size)
  95 {
  96   enum built_in_function fcode;
  97
  98   if (size <= 1)
  99     fcode = is_write ? BUILT_IN_TSAN_WRITE1
 100                      : BUILT_IN_TSAN_READ1;
 101   else if (size <= 3)
 102     fcode = is_write ? BUILT_IN_TSAN_WRITE2
 103                      : BUILT_IN_TSAN_READ2;
 104   else if (size <= 7)
 105     fcode = is_write ? BUILT_IN_TSAN_WRITE4
 106                      : BUILT_IN_TSAN_READ4;
 107   else if (size <= 15)
 108     fcode = is_write ? BUILT_IN_TSAN_WRITE8
 109                      : BUILT_IN_TSAN_READ8;
 110   else
 111     fcode = is_write ? BUILT_IN_TSAN_WRITE16
 112                      : BUILT_IN_TSAN_READ16;
 113
 114   return builtin_decl_implicit (fcode);
 115 }
 116
 117 /* Check as to whether EXPR refers to a store to vptr.  */
 118
 119 static tree
 120 is_vptr_store (gimple stmt, tree expr, bool is_write)
 121 {
 122   if (is_write == true
 123       && gimple_assign_single_p (stmt)
 124       && TREE_CODE (expr) == COMPONENT_REF)
 125     {
 126       tree field = TREE_OPERAND (expr, 1);
 127       if (TREE_CODE (field) == FIELD_DECL
 128           && DECL_VIRTUAL_P (field))
 129         return gimple_assign_rhs1 (stmt);
 130     }
 131   return NULL;
 132 }
 133
 134 /* Instruments EXPR if needed. If any instrumentation is inserted,
 135    return true.  */
 136
 137 static bool
 138 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 139 {
 140   tree base, rhs, expr_ptr, builtin_decl;
 141   basic_block bb;
 142   HOST_WIDE_INT size;
 143   gimple stmt, g;
 144   gimple_seq seq;
 145   location_t loc;
 146   unsigned int align;
 147
 148   size = int_size_in_bytes (TREE_TYPE (expr));
 149   if (size <= 0)
 150     return false;
 151
 152   HOST_WIDE_INT bitsize, bitpos;
 153   tree offset;
 154   machine_mode mode;
 155   int volatilep = 0, unsignedp = 0;
 156   base = get_inner_reference (expr, &bitsize, &bitpos, &offset,
 157                               &mode, &unsignedp, &volatilep, false);
 158
 159   /* No need to instrument accesses to decls that don't escape,
 160      they can't escape to other threads then.  */
 161   if (DECL_P (base) && !is_global_var (base))
 162     {
 163       struct pt_solution pt;
 164       memset (&pt, 0, sizeof (pt));
 165       pt.escaped = 1;
 166       pt.ipa_escaped = flag_ipa_pta != 0;
 167       if (!pt_solution_includes (&pt, base))
 168         return false;
 169       if (!may_be_aliased (base))
 170         return false;
 171     }
 172
 173   if (TREE_READONLY (base)
 174       || (TREE_CODE (base) == VAR_DECL
 175           && DECL_HARD_REGISTER (base)))
 176     return false;
 177
 178   stmt = gsi_stmt (gsi);
 179   loc = gimple_location (stmt);
 180   rhs = is_vptr_store (stmt, expr, is_write);
 181
 182   if ((TREE_CODE (expr) == COMPONENT_REF
 183        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 184       || TREE_CODE (expr) == BIT_FIELD_REF)
 185     {
 186       base = TREE_OPERAND (expr, 0);
 187       if (TREE_CODE (expr) == COMPONENT_REF)
 188         {
 189           expr = TREE_OPERAND (expr, 1);
 190           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 191             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 192           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 193               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 194               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 195             return false;
 196           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 197                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 198           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 199         }
 200       else
 201         {
 202           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 203               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 204             return false;
 205           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 206           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 207         }
 208       if (bitpos < 0 || bitsize <= 0)
 209         return false;
 210       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 211              / BITS_PER_UNIT;
 212       if (may_be_nonaddressable_p (base))
 213         return false;
 214       align = get_object_alignment (base);
 215       if (align < BITS_PER_UNIT)
 216         return false;
 217       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 218       if ((align - 1) & bitpos)
 219         {
 220           align = (align - 1) & bitpos;
 221           align = align & -align;
 222         }
 223       expr = build_fold_addr_expr (unshare_expr (base));
 224       expr = build2 (MEM_REF, char_type_node, expr,
 225                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 226       expr_ptr = build_fold_addr_expr (expr);
 227     }
 228   else
 229     {
 230       if (may_be_nonaddressable_p (expr))
 231         return false;
 232       align = get_object_alignment (expr);
 233       if (align < BITS_PER_UNIT)
 234         return false;
 235       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 236     }
 237   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 238   if ((size & (size - 1)) != 0 || size > 16
 239       || align < MIN (size, 8) * BITS_PER_UNIT)
 240     {
 241       builtin_decl = builtin_decl_implicit (is_write
 242                                             ? BUILT_IN_TSAN_WRITE_RANGE
 243                                             : BUILT_IN_TSAN_READ_RANGE);
 244       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 245     }
 246   else if (rhs == NULL)
 247     g = gimple_build_call (get_memory_access_decl (is_write, size),
 248                            1, expr_ptr);
 249   else
 250     {
 251       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 252       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 253     }
 254   gimple_set_location (g, loc);
 255   gimple_seq_add_stmt_without_update (&seq, g);
 256   /* Instrumentation for assignment of a function result
 257      must be inserted after the call.  Instrumentation for
 258      reads of function arguments must be inserted before the call.
 259      That's because the call can contain synchronization.  */
 260   if (is_gimple_call (stmt) && is_write)
 261     {
 262       /* If the call can throw, it must be the last stmt in
 263          a basic block, so the instrumented stmts need to be
 264          inserted in successor bbs.  */
 265       if (is_ctrl_altering_stmt (stmt))
 266         {
 267           edge e;
 268
 269           bb = gsi_bb (gsi);
 270           e = find_fallthru_edge (bb->succs);
 271           if (e)
 272             gsi_insert_seq_on_edge_immediate (e, seq);
 273         }
 274       else
 275         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 276     }
 277   else
 278     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 279
 280   return true;
 281 }
 282
 283 /* Actions for sync/atomic builtin transformations.  */
 284 enum tsan_atomic_action
 285 {
 286   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 287   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 288 };
 289
 290 /* Table how to map sync/atomic builtins to their corresponding
 291    tsan equivalents.  */
 292 static const struct tsan_map_atomic
 293 {
 294   enum built_in_function fcode, tsan_fcode;
 295   enum tsan_atomic_action action;
 296   enum tree_code code;
 297 } tsan_atomic_table[] =
 298 {
 299 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 300   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 301 #define CHECK_LAST(fcode, tsan_fcode) \
 302   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 303 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 304   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 305 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 306   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 307 #define WEAK_CAS(fcode, tsan_fcode) \
 308   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 309 #define STRONG_CAS(fcode, tsan_fcode) \
 310   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 311 #define BOOL_CAS(fcode, tsan_fcode) \
 312   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 313 #define VAL_CAS(fcode, tsan_fcode) \
 314   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 315 #define LOCK_RELEASE(fcode, tsan_fcode) \
 316   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 317 #define FETCH_OP(fcode, tsan_fcode, code) \
 318   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 319 #define FETCH_OPS(fcode, tsan_fcode, code) \
 320   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 321
 322   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 323   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 324   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 325   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 326   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 327   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 328   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 329   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 330   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 331   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 332   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 333   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 334   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 335   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 336   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 337   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 338   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 339   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 340   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 341   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 342   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 343   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 344   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 345   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 346   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 347   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 348   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 349   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 350   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 351   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 352   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 353   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 354   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 355   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 356   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 357   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 358   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 359   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 360   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 361   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 362   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 363   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 364   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 365   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 366   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 367
 368   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 369   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 370
 371   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 372   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 373   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 374   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 375   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 376   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 377   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 378   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 379   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 380   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 381   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 382   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 383   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 384   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 385   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 386   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 387   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 388   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 389   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 390   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 391   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 392   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 393   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 394   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 395   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 396   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 397   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 398   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 399   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 400   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 401
 402   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 403   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 404   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 405   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 406   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 407
 408   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 409   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 410   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 411   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 412   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 413   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 414   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 415   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 416   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 417   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 418   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 419   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 420   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 421   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 422   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 423   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 424   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 425   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 426   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 427   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 428   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 429   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 430   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 431   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 432   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 433   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 434   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 435   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 436   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 437   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 438
 439   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 440
 441   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 442   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 443   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 444   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 445   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 446   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 447   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 448   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 449   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 450   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 451   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 452   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 453   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 454   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 455   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 456   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 457   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 458   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 459   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 460   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 461   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 462   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 463   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 464   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 465   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 466   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 467   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 468   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 469   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 470   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 471
 472   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 473   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 474   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 475   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 476   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 477
 478   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 479   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 480               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 481   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 482               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 483   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 484               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 485   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 486               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 487
 488   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 489             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 490   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 491             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 492   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 493             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 494   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 495             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 496   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 497             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 498
 499   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 500   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 501   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 502   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 503   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 504            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 505
 506   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 507   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 508   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 509   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 510   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE)
 511 };
 512
 513 /* Instrument an atomic builtin.  */
 514
 515 static void
 516 instrument_builtin_call (gimple_stmt_iterator *gsi)
 517 {
 518   gimple stmt = gsi_stmt (*gsi), g;
 519   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 520   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 521   unsigned int i, num = gimple_call_num_args (stmt), j;
 522   for (j = 0; j < 6 && j < num; j++)
 523     args[j] = gimple_call_arg (stmt, j);
 524   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 525     if (fcode != tsan_atomic_table[i].fcode)
 526       continue;
 527     else
 528       {
 529         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 530         if (decl == NULL_TREE)
 531           return;
 532         switch (tsan_atomic_table[i].action)
 533           {
 534           case check_last:
 535           case fetch_op:
 536             last_arg = gimple_call_arg (stmt, num - 1);
 537             if (!tree_fits_uhwi_p (last_arg)
 538                 || tree_to_uhwi (last_arg) > MEMMODEL_SEQ_CST)
 539               return;
 540             gimple_call_set_fndecl (stmt, decl);
 541             update_stmt (stmt);
 542             if (tsan_atomic_table[i].action == fetch_op)
 543               {
 544                 args[1] = gimple_call_arg (stmt, 1);
 545                 goto adjust_result;
 546               }
 547             return;
 548           case add_seq_cst:
 549           case add_acquire:
 550           case fetch_op_seq_cst:
 551             gcc_assert (num <= 2);
 552             for (j = 0; j < num; j++)
 553               args[j] = gimple_call_arg (stmt, j);
 554             for (; j < 2; j++)
 555               args[j] = NULL_TREE;
 556             args[num] = build_int_cst (NULL_TREE,
 557                                        tsan_atomic_table[i].action
 558                                        != add_acquire
 559                                        ? MEMMODEL_SEQ_CST
 560                                        : MEMMODEL_ACQUIRE);
 561             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 562             stmt = gsi_stmt (*gsi);
 563             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 564               {
 565               adjust_result:
 566                 lhs = gimple_call_lhs (stmt);
 567                 if (lhs == NULL_TREE)
 568                   return;
 569                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 570                                                 TREE_TYPE (args[1])))
 571                   {
 572                     tree var = make_ssa_name (TREE_TYPE (lhs));
 573                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 574                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 575                     args[1] = var;
 576                   }
 577                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 578                 /* BIT_NOT_EXPR stands for NAND.  */
 579                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 580                   {
 581                     tree var = make_ssa_name (TREE_TYPE (lhs));
 582                     g = gimple_build_assign (var, BIT_AND_EXPR,
 583                                              gimple_call_lhs (stmt), args[1]);
 584                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 585                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 586                   }
 587                 else
 588                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 589                                            gimple_call_lhs (stmt), args[1]);
 590                 update_stmt (stmt);
 591                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 592               }
 593             return;
 594           case weak_cas:
 595             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 596               continue;
 597             /* FALLTHRU */
 598           case strong_cas:
 599             gcc_assert (num == 6);
 600             for (j = 0; j < 6; j++)
 601               args[j] = gimple_call_arg (stmt, j);
 602             if (!tree_fits_uhwi_p (args[4])
 603                 || tree_to_uhwi (args[4]) > MEMMODEL_SEQ_CST)
 604               return;
 605             if (!tree_fits_uhwi_p (args[5])
 606                 || tree_to_uhwi (args[5]) > MEMMODEL_SEQ_CST)
 607               return;
 608             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 609                                 args[4], args[5]);
 610             return;
 611           case bool_cas:
 612           case val_cas:
 613             gcc_assert (num == 3);
 614             for (j = 0; j < 3; j++)
 615               args[j] = gimple_call_arg (stmt, j);
 616             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 617             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 618             t = create_tmp_var (t);
 619             mark_addressable (t);
 620             if (!useless_type_conversion_p (TREE_TYPE (t),
 621                                             TREE_TYPE (args[1])))
 622               {
 623                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 624                                          NOP_EXPR, args[1]);
 625                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 626                 args[1] = gimple_assign_lhs (g);
 627               }
 628             g = gimple_build_assign (t, args[1]);
 629             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 630             lhs = gimple_call_lhs (stmt);
 631             update_gimple_call (gsi, decl, 5, args[0],
 632                                 build_fold_addr_expr (t), args[2],
 633                                 build_int_cst (NULL_TREE,
 634                                                MEMMODEL_SEQ_CST),
 635                                 build_int_cst (NULL_TREE,
 636                                                MEMMODEL_SEQ_CST));
 637             if (tsan_atomic_table[i].action == val_cas && lhs)
 638               {
 639                 tree cond;
 640                 stmt = gsi_stmt (*gsi);
 641                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 642                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 643                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 644                 cond = build2 (NE_EXPR, boolean_type_node, t,
 645                                build_int_cst (TREE_TYPE (t), 0));
 646                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 647                                          gimple_assign_lhs (g));
 648                 gimple_call_set_lhs (stmt, t);
 649                 update_stmt (stmt);
 650                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 651               }
 652             return;
 653           case lock_release:
 654             gcc_assert (num == 1);
 655             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 656             t = TREE_VALUE (TREE_CHAIN (t));
 657             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 658                                 build_int_cst (t, 0),
 659                                 build_int_cst (NULL_TREE,
 660                                                MEMMODEL_RELEASE));
 661             return;
 662           default:
 663             continue;
 664           }
 665       }
 666 }
 667
 668 /* Instruments the gimple pointed to by GSI. Return
 669    true if func entry/exit should be instrumented.  */
 670
 671 static bool
 672 instrument_gimple (gimple_stmt_iterator *gsi)
 673 {
 674   gimple stmt;
 675   tree rhs, lhs;
 676   bool instrumented = false;
 677
 678   stmt = gsi_stmt (*gsi);
 679   if (is_gimple_call (stmt)
 680       && (gimple_call_fndecl (stmt)
 681           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 682     {
 683       /* All functions with function call will have exit instrumented,
 684          therefore no function calls other than __tsan_func_exit
 685          shall appear in the functions.  */
 686       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 687       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 688         instrument_builtin_call (gsi);
 689       return true;
 690     }
 691   else if (is_gimple_assign (stmt)
 692            && !gimple_clobber_p (stmt))
 693     {
 694       if (gimple_store_p (stmt))
 695         {
 696           lhs = gimple_assign_lhs (stmt);
 697           instrumented = instrument_expr (*gsi, lhs, true);
 698         }
 699       if (gimple_assign_load_p (stmt))
 700         {
 701           rhs = gimple_assign_rhs1 (stmt);
 702           instrumented = instrument_expr (*gsi, rhs, false);
 703         }
 704     }
 705   return instrumented;
 706 }
 707
 708 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 709
 710 static void
 711 replace_func_exit (gimple stmt)
 712 {
 713   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 714   gimple g = gimple_build_call (builtin_decl, 0);
 715   gimple_set_location (g, cfun->function_end_locus);
 716   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 717   gsi_replace (&gsi, g, true);
 718 }
 719
 720 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 721
 722 static void
 723 instrument_func_exit (void)
 724 {
 725   location_t loc;
 726   basic_block exit_bb;
 727   gimple_stmt_iterator gsi;
 728   gimple stmt, g;
 729   tree builtin_decl;
 730   edge e;
 731   edge_iterator ei;
 732
 733   /* Find all function exits.  */
 734   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 735   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 736     {
 737       gsi = gsi_last_bb (e->src);
 738       stmt = gsi_stmt (gsi);
 739       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 740                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 741       loc = gimple_location (stmt);
 742       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 743       g = gimple_build_call (builtin_decl, 0);
 744       gimple_set_location (g, loc);
 745       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 746     }
 747 }
 748
 749 /* Instruments all interesting memory accesses in the current function.
 750    Return true if func entry/exit should be instrumented.  */
 751
 752 static bool
 753 instrument_memory_accesses (void)
 754 {
 755   basic_block bb;
 756   gimple_stmt_iterator gsi;
 757   bool fentry_exit_instrument = false;
 758   bool func_exit_seen = false;
 759   auto_vec<gimple> tsan_func_exits;
 760
 761   FOR_EACH_BB_FN (bb, cfun)
 762     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 763       {
 764         gimple stmt = gsi_stmt (gsi);
 765         if (is_gimple_call (stmt)
 766             && gimple_call_internal_p (stmt)
 767             && gimple_call_internal_fn (stmt) == IFN_TSAN_FUNC_EXIT)
 768           {
 769             if (fentry_exit_instrument)
 770               replace_func_exit (stmt);
 771             else
 772               tsan_func_exits.safe_push (stmt);
 773             func_exit_seen = true;
 774           }
 775         else
 776           fentry_exit_instrument |= instrument_gimple (&gsi);
 777       }
 778   unsigned int i;
 779   gimple stmt;
 780   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 781     if (fentry_exit_instrument)
 782       replace_func_exit (stmt);
 783     else
 784       {
 785         gsi = gsi_for_stmt (stmt);
 786         gsi_remove (&gsi, true);
 787       }
 788   if (fentry_exit_instrument && !func_exit_seen)
 789     instrument_func_exit ();
 790   return fentry_exit_instrument;
 791 }
 792
 793 /* Instruments function entry.  */
 794
 795 static void
 796 instrument_func_entry (void)
 797 {
 798   tree ret_addr, builtin_decl;
 799   gimple g;
 800   gimple_seq seq = NULL;
 801
 802   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 803   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 804   ret_addr = make_ssa_name (ptr_type_node);
 805   gimple_call_set_lhs (g, ret_addr);
 806   gimple_set_location (g, cfun->function_start_locus);
 807   gimple_seq_add_stmt_without_update (&seq, g);
 808
 809   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 810   g = gimple_build_call (builtin_decl, 1, ret_addr);
 811   gimple_set_location (g, cfun->function_start_locus);
 812   gimple_seq_add_stmt_without_update (&seq, g);
 813
 814   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 815   gsi_insert_seq_on_edge_immediate (e, seq);
 816 }
 817
 818 /* ThreadSanitizer instrumentation pass.  */
 819
 820 static unsigned
 821 tsan_pass (void)
 822 {
 823   initialize_sanitizer_builtins ();
 824   if (instrument_memory_accesses ())
 825     instrument_func_entry ();
 826   return 0;
 827 }
 828
 829 /* Inserts __tsan_init () into the list of CTORs.  */
 830
 831 void
 832 tsan_finish_file (void)
 833 {
 834   tree ctor_statements = NULL_TREE;
 835
 836   initialize_sanitizer_builtins ();
 837   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 838   append_to_statement_list (build_call_expr (init_decl, 0),
 839                             &ctor_statements);
 840   cgraph_build_static_cdtor ('I', ctor_statements,
 841                              MAX_RESERVED_INIT_PRIORITY - 1);
 842 }
 843
 844 /* The pass descriptor.  */
 845
 846 namespace {
 847
 848 const pass_data pass_data_tsan =
 849 {
 850   GIMPLE_PASS, /* type */
 851   "tsan", /* name */
 852   OPTGROUP_NONE, /* optinfo_flags */
 853   TV_NONE, /* tv_id */
 854   ( PROP_ssa | PROP_cfg ), /* properties_required */
 855   0, /* properties_provided */
 856   0, /* properties_destroyed */
 857   0, /* todo_flags_start */
 858   TODO_update_ssa, /* todo_flags_finish */
 859 };
 860
 861 class pass_tsan : public gimple_opt_pass
 862 {
 863 public:
 864   pass_tsan (gcc::context *ctxt)
 865     : gimple_opt_pass (pass_data_tsan, ctxt)
 866   {}
 867
 868   /* opt_pass methods: */
 869   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 870   virtual bool gate (function *)
 871 {
 872   return ((flag_sanitize & SANITIZE_THREAD) != 0
 873           && !lookup_attribute ("no_sanitize_thread",
 874                                 DECL_ATTRIBUTES (current_function_decl)));
 875 }
 876
 877   virtual unsigned int execute (function *) { return tsan_pass (); }
 878
 879 }; // class pass_tsan
 880
 881 } // anon namespace
 882
 883 gimple_opt_pass *
 884 make_pass_tsan (gcc::context *ctxt)
 885 {
 886   return new pass_tsan (ctxt);
 887 }
 888
 889 namespace {
 890
 891 const pass_data pass_data_tsan_O0 =
 892 {
 893   GIMPLE_PASS, /* type */
 894   "tsan0", /* name */
 895   OPTGROUP_NONE, /* optinfo_flags */
 896   TV_NONE, /* tv_id */
 897   ( PROP_ssa | PROP_cfg ), /* properties_required */
 898   0, /* properties_provided */
 899   0, /* properties_destroyed */
 900   0, /* todo_flags_start */
 901   TODO_update_ssa, /* todo_flags_finish */
 902 };
 903
 904 class pass_tsan_O0 : public gimple_opt_pass
 905 {
 906 public:
 907   pass_tsan_O0 (gcc::context *ctxt)
 908     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 909   {}
 910
 911   /* opt_pass methods: */
 912   virtual bool gate (function *)
 913     {
 914       return ((flag_sanitize & SANITIZE_THREAD) != 0 && !optimize
 915               && !lookup_attribute ("no_sanitize_thread",
 916                                     DECL_ATTRIBUTES (current_function_decl)));
 917     }
 918
 919   virtual unsigned int execute (function *) { return tsan_pass (); }
 920
 921 }; // class pass_tsan_O0
 922
 923 } // anon namespace
 924
 925 gimple_opt_pass *
 926 make_pass_tsan_O0 (gcc::context *ctxt)
 927 {
 928   return new pass_tsan_O0 (ctxt);
 929 }