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