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