gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2017 Free Software Foundation, Inc.
   3    Contributed by Dmitry Vyukov <dvyukov@google.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "backend.h"
  26 #include "rtl.h"
  27 #include "tree.h"
  28 #include "memmodel.h"
  29 #include "gimple.h"
  30 #include "tree-pass.h"
  31 #include "ssa.h"
  32 #include "cgraph.h"
  33 #include "fold-const.h"
  34 #include "gimplify.h"
  35 #include "gimple-iterator.h"
  36 #include "gimplify-me.h"
  37 #include "tree-cfg.h"
  38 #include "tree-iterator.h"
  39 #include "tree-ssa-propagate.h"
  40 #include "tree-ssa-loop-ivopts.h"
  41 #include "tsan.h"
  42 #include "asan.h"
  43 #include "builtins.h"
  44 #include "target.h"
  45
  46 /* Number of instrumented memory accesses in the current function.  */
  47
  48 /* Builds the following decl
  49    void __tsan_read/writeX (void *addr);  */
  50
  51 static tree
  52 get_memory_access_decl (bool is_write, unsigned size)
  53 {
  54   enum built_in_function fcode;
  55
  56   if (size <= 1)
  57     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  58                      : BUILT_IN_TSAN_READ1;
  59   else if (size <= 3)
  60     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  61                      : BUILT_IN_TSAN_READ2;
  62   else if (size <= 7)
  63     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  64                      : BUILT_IN_TSAN_READ4;
  65   else if (size <= 15)
  66     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  67                      : BUILT_IN_TSAN_READ8;
  68   else
  69     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  70                      : BUILT_IN_TSAN_READ16;
  71
  72   return builtin_decl_implicit (fcode);
  73 }
  74
  75 /* Check as to whether EXPR refers to a store to vptr.  */
  76
  77 static tree
  78 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  79 {
  80   if (is_write == true
  81       && gimple_assign_single_p (stmt)
  82       && TREE_CODE (expr) == COMPONENT_REF)
  83     {
  84       tree field = TREE_OPERAND (expr, 1);
  85       if (TREE_CODE (field) == FIELD_DECL
  86           && DECL_VIRTUAL_P (field))
  87         return gimple_assign_rhs1 (stmt);
  88     }
  89   return NULL;
  90 }
  91
  92 /* Instruments EXPR if needed. If any instrumentation is inserted,
  93    return true.  */
  94
  95 static bool
  96 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
  97 {
  98   tree base, rhs, expr_ptr, builtin_decl;
  99   basic_block bb;
 100   HOST_WIDE_INT size;
 101   gimple *stmt, *g;
 102   gimple_seq seq;
 103   location_t loc;
 104   unsigned int align;
 105
 106   size = int_size_in_bytes (TREE_TYPE (expr));
 107   if (size <= 0)
 108     return false;
 109
 110   HOST_WIDE_INT bitsize, bitpos;
 111   tree offset;
 112   machine_mode mode;
 113   int unsignedp, reversep, volatilep = 0;
 114   base = get_inner_reference (expr, &bitsize, &bitpos, &offset, &mode,
 115                               &unsignedp, &reversep, &volatilep);
 116
 117   /* No need to instrument accesses to decls that don't escape,
 118      they can't escape to other threads then.  */
 119   if (DECL_P (base) && !is_global_var (base))
 120     {
 121       struct pt_solution pt;
 122       memset (&pt, 0, sizeof (pt));
 123       pt.escaped = 1;
 124       pt.ipa_escaped = flag_ipa_pta != 0;
 125       if (!pt_solution_includes (&pt, base))
 126         return false;
 127       if (!may_be_aliased (base))
 128         return false;
 129     }
 130
 131   if (TREE_READONLY (base) || (VAR_P (base) && DECL_HARD_REGISTER (base)))
 132     return false;
 133
 134   stmt = gsi_stmt (gsi);
 135   loc = gimple_location (stmt);
 136   rhs = is_vptr_store (stmt, expr, is_write);
 137
 138   if ((TREE_CODE (expr) == COMPONENT_REF
 139        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 140       || TREE_CODE (expr) == BIT_FIELD_REF)
 141     {
 142       base = TREE_OPERAND (expr, 0);
 143       if (TREE_CODE (expr) == COMPONENT_REF)
 144         {
 145           expr = TREE_OPERAND (expr, 1);
 146           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 147             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 148           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 149               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 150               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 151             return false;
 152           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 153                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 154           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 155         }
 156       else
 157         {
 158           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 159               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 160             return false;
 161           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 162           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 163         }
 164       if (bitpos < 0 || bitsize <= 0)
 165         return false;
 166       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 167              / BITS_PER_UNIT;
 168       if (may_be_nonaddressable_p (base))
 169         return false;
 170       align = get_object_alignment (base);
 171       if (align < BITS_PER_UNIT)
 172         return false;
 173       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 174       if ((align - 1) & bitpos)
 175         {
 176           align = (align - 1) & bitpos;
 177           align = least_bit_hwi (align);
 178         }
 179       expr = build_fold_addr_expr (unshare_expr (base));
 180       expr = build2 (MEM_REF, char_type_node, expr,
 181                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 182       expr_ptr = build_fold_addr_expr (expr);
 183     }
 184   else
 185     {
 186       if (may_be_nonaddressable_p (expr))
 187         return false;
 188       align = get_object_alignment (expr);
 189       if (align < BITS_PER_UNIT)
 190         return false;
 191       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 192     }
 193   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 194   if ((size & (size - 1)) != 0 || size > 16
 195       || align < MIN (size, 8) * BITS_PER_UNIT)
 196     {
 197       builtin_decl = builtin_decl_implicit (is_write
 198                                             ? BUILT_IN_TSAN_WRITE_RANGE
 199                                             : BUILT_IN_TSAN_READ_RANGE);
 200       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 201     }
 202   else if (rhs == NULL)
 203     g = gimple_build_call (get_memory_access_decl (is_write, size),
 204                            1, expr_ptr);
 205   else
 206     {
 207       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 208       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 209     }
 210   gimple_set_location (g, loc);
 211   gimple_seq_add_stmt_without_update (&seq, g);
 212   /* Instrumentation for assignment of a function result
 213      must be inserted after the call.  Instrumentation for
 214      reads of function arguments must be inserted before the call.
 215      That's because the call can contain synchronization.  */
 216   if (is_gimple_call (stmt) && is_write)
 217     {
 218       /* If the call can throw, it must be the last stmt in
 219          a basic block, so the instrumented stmts need to be
 220          inserted in successor bbs.  */
 221       if (is_ctrl_altering_stmt (stmt))
 222         {
 223           edge e;
 224
 225           bb = gsi_bb (gsi);
 226           e = find_fallthru_edge (bb->succs);
 227           if (e)
 228             gsi_insert_seq_on_edge_immediate (e, seq);
 229         }
 230       else
 231         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 232     }
 233   else
 234     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 235
 236   return true;
 237 }
 238
 239 /* Actions for sync/atomic builtin transformations.  */
 240 enum tsan_atomic_action
 241 {
 242   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 243   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst,
 244   bool_clear, bool_test_and_set
 245 };
 246
 247 /* Table how to map sync/atomic builtins to their corresponding
 248    tsan equivalents.  */
 249 static const struct tsan_map_atomic
 250 {
 251   enum built_in_function fcode, tsan_fcode;
 252   enum tsan_atomic_action action;
 253   enum tree_code code;
 254 } tsan_atomic_table[] =
 255 {
 256 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 257   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 258 #define CHECK_LAST(fcode, tsan_fcode) \
 259   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 260 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 261   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 262 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 263   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 264 #define WEAK_CAS(fcode, tsan_fcode) \
 265   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 266 #define STRONG_CAS(fcode, tsan_fcode) \
 267   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 268 #define BOOL_CAS(fcode, tsan_fcode) \
 269   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 270 #define VAL_CAS(fcode, tsan_fcode) \
 271   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 272 #define LOCK_RELEASE(fcode, tsan_fcode) \
 273   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 274 #define FETCH_OP(fcode, tsan_fcode, code) \
 275   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 276 #define FETCH_OPS(fcode, tsan_fcode, code) \
 277   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 278 #define BOOL_CLEAR(fcode, tsan_fcode) \
 279   TRANSFORM (fcode, tsan_fcode, bool_clear, ERROR_MARK)
 280 #define BOOL_TEST_AND_SET(fcode, tsan_fcode) \
 281   TRANSFORM (fcode, tsan_fcode, bool_test_and_set, ERROR_MARK)
 282
 283   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 284   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 285   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 286   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 287   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 288   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 289   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 290   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 291   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 292   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 293   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 294   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 295   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 296   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 297   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 298   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 299   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 300   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 301   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 302   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 303   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 304   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 305   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 306   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 307   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 308   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 309   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 310   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 311   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 312   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 313   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 314   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 315   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 316   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 317   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 318   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 319   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 320   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 321   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 322   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 323   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 324   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 325   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 326   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 327   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 328
 329   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 330   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 331
 332   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 333   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 334   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 335   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 336   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 337   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 338   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 339   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 340   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 341   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 342   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 343   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 344   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 345   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 346   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 347   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 348   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 349   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 350   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 351   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 352   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 353   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 354   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 355   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 356   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 357   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 358   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 359   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 360   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 361   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 362
 363   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 364   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 365   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 366   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 367   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 368
 369   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 370   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 371   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 372   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 373   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 374   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 375   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 376   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 377   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 378   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 379   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 380   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 381   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 382   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 383   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 384   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 385   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 386   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 387   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 388   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 389   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 390   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 391   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 392   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 393   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 394   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 395   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 396   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 397   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 398   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 399
 400   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 401
 402   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 403   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 404   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 405   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 406   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 407   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 408   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 409   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 410   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 411   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 412   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 413   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 414   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 415   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 416   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 417   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 418   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 419   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 420   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 421   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 422   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 423   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 424   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 425   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 426   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 427   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 428   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 429   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 430   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 431   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 432
 433   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 434   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 435   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 436   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 437   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 438
 439   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 440   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 441               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 442   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 443               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 444   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 445               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 446   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 447               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 448
 449   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 450             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 451   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 452             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 453   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 454             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 455   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 456             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 457   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 458             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 459
 460   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 461   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 462   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 463   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 464   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 465            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 466
 467   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 468   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 469   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 470   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 471   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE),
 472
 473   BOOL_CLEAR (ATOMIC_CLEAR, TSAN_ATOMIC8_STORE),
 474
 475   BOOL_TEST_AND_SET (ATOMIC_TEST_AND_SET, TSAN_ATOMIC8_EXCHANGE)
 476 };
 477
 478 /* Instrument an atomic builtin.  */
 479
 480 static void
 481 instrument_builtin_call (gimple_stmt_iterator *gsi)
 482 {
 483   gimple *stmt = gsi_stmt (*gsi), *g;
 484   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 485   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 486   unsigned int i, num = gimple_call_num_args (stmt), j;
 487   for (j = 0; j < 6 && j < num; j++)
 488     args[j] = gimple_call_arg (stmt, j);
 489   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 490     if (fcode != tsan_atomic_table[i].fcode)
 491       continue;
 492     else
 493       {
 494         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 495         if (decl == NULL_TREE)
 496           return;
 497         switch (tsan_atomic_table[i].action)
 498           {
 499           case check_last:
 500           case fetch_op:
 501             last_arg = gimple_call_arg (stmt, num - 1);
 502             if (!tree_fits_uhwi_p (last_arg)
 503                 || memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 504               return;
 505             gimple_call_set_fndecl (stmt, decl);
 506             update_stmt (stmt);
 507             if (tsan_atomic_table[i].action == fetch_op)
 508               {
 509                 args[1] = gimple_call_arg (stmt, 1);
 510                 goto adjust_result;
 511               }
 512             return;
 513           case add_seq_cst:
 514           case add_acquire:
 515           case fetch_op_seq_cst:
 516             gcc_assert (num <= 2);
 517             for (j = 0; j < num; j++)
 518               args[j] = gimple_call_arg (stmt, j);
 519             for (; j < 2; j++)
 520               args[j] = NULL_TREE;
 521             args[num] = build_int_cst (NULL_TREE,
 522                                        tsan_atomic_table[i].action
 523                                        != add_acquire
 524                                        ? MEMMODEL_SEQ_CST
 525                                        : MEMMODEL_ACQUIRE);
 526             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 527             stmt = gsi_stmt (*gsi);
 528             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 529               {
 530               adjust_result:
 531                 lhs = gimple_call_lhs (stmt);
 532                 if (lhs == NULL_TREE)
 533                   return;
 534                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 535                                                 TREE_TYPE (args[1])))
 536                   {
 537                     tree var = make_ssa_name (TREE_TYPE (lhs));
 538                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 539                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 540                     args[1] = var;
 541                   }
 542                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 543                 /* BIT_NOT_EXPR stands for NAND.  */
 544                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 545                   {
 546                     tree var = make_ssa_name (TREE_TYPE (lhs));
 547                     g = gimple_build_assign (var, BIT_AND_EXPR,
 548                                              gimple_call_lhs (stmt), args[1]);
 549                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 550                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 551                   }
 552                 else
 553                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 554                                            gimple_call_lhs (stmt), args[1]);
 555                 update_stmt (stmt);
 556                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 557               }
 558             return;
 559           case weak_cas:
 560             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 561               continue;
 562             /* FALLTHRU */
 563           case strong_cas:
 564             gcc_assert (num == 6);
 565             for (j = 0; j < 6; j++)
 566               args[j] = gimple_call_arg (stmt, j);
 567             if (!tree_fits_uhwi_p (args[4])
 568                 || memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 569               return;
 570             if (!tree_fits_uhwi_p (args[5])
 571                 || memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 572               return;
 573             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 574                                 args[4], args[5]);
 575             return;
 576           case bool_cas:
 577           case val_cas:
 578             gcc_assert (num == 3);
 579             for (j = 0; j < 3; j++)
 580               args[j] = gimple_call_arg (stmt, j);
 581             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 582             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 583             t = create_tmp_var (t);
 584             mark_addressable (t);
 585             if (!useless_type_conversion_p (TREE_TYPE (t),
 586                                             TREE_TYPE (args[1])))
 587               {
 588                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 589                                          NOP_EXPR, args[1]);
 590                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 591                 args[1] = gimple_assign_lhs (g);
 592               }
 593             g = gimple_build_assign (t, args[1]);
 594             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 595             lhs = gimple_call_lhs (stmt);
 596             update_gimple_call (gsi, decl, 5, args[0],
 597                                 build_fold_addr_expr (t), args[2],
 598                                 build_int_cst (NULL_TREE,
 599                                                MEMMODEL_SEQ_CST),
 600                                 build_int_cst (NULL_TREE,
 601                                                MEMMODEL_SEQ_CST));
 602             if (tsan_atomic_table[i].action == val_cas && lhs)
 603               {
 604                 tree cond;
 605                 stmt = gsi_stmt (*gsi);
 606                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 607                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 608                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 609                 cond = build2 (NE_EXPR, boolean_type_node, t,
 610                                build_int_cst (TREE_TYPE (t), 0));
 611                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 612                                          gimple_assign_lhs (g));
 613                 gimple_call_set_lhs (stmt, t);
 614                 update_stmt (stmt);
 615                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 616               }
 617             return;
 618           case lock_release:
 619             gcc_assert (num == 1);
 620             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 621             t = TREE_VALUE (TREE_CHAIN (t));
 622             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 623                                 build_int_cst (t, 0),
 624                                 build_int_cst (NULL_TREE,
 625                                                MEMMODEL_RELEASE));
 626             return;
 627           case bool_clear:
 628           case bool_test_and_set:
 629             if (BOOL_TYPE_SIZE != 8)
 630               {
 631                 decl = NULL_TREE;
 632                 for (j = 1; j < 5; j++)
 633                   if (BOOL_TYPE_SIZE == (8 << j))
 634                     {
 635                       enum built_in_function tsan_fcode
 636                         = (enum built_in_function)
 637                           (tsan_atomic_table[i].tsan_fcode + j);
 638                       decl = builtin_decl_implicit (tsan_fcode);
 639                       break;
 640                     }
 641                 if (decl == NULL_TREE)
 642                   return;
 643               }
 644             last_arg = gimple_call_arg (stmt, num - 1);
 645             if (!tree_fits_uhwi_p (last_arg)
 646                 || memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 647               return;
 648             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 649             t = TREE_VALUE (TREE_CHAIN (t));
 650             if (tsan_atomic_table[i].action == bool_clear)
 651               {
 652                 update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 653                                     build_int_cst (t, 0), last_arg);
 654                 return;
 655               }
 656             t = build_int_cst (t, targetm.atomic_test_and_set_trueval);
 657             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 658                                 t, last_arg);
 659             stmt = gsi_stmt (*gsi);
 660             lhs = gimple_call_lhs (stmt);
 661             if (lhs == NULL_TREE)
 662               return;
 663             if (targetm.atomic_test_and_set_trueval != 1
 664                 || !useless_type_conversion_p (TREE_TYPE (lhs),
 665                                                TREE_TYPE (t)))
 666               {
 667                 tree new_lhs = make_ssa_name (TREE_TYPE (t));
 668                 gimple_call_set_lhs (stmt, new_lhs);
 669                 if (targetm.atomic_test_and_set_trueval != 1)
 670                   g = gimple_build_assign (lhs, NE_EXPR, new_lhs,
 671                                            build_int_cst (TREE_TYPE (t), 0));
 672                 else
 673                   g = gimple_build_assign (lhs, NOP_EXPR, new_lhs);
 674                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 675                 update_stmt (stmt);
 676               }
 677             return;
 678           default:
 679             continue;
 680           }
 681       }
 682 }
 683
 684 /* Instruments the gimple pointed to by GSI. Return
 685    true if func entry/exit should be instrumented.  */
 686
 687 static bool
 688 instrument_gimple (gimple_stmt_iterator *gsi)
 689 {
 690   gimple *stmt;
 691   tree rhs, lhs;
 692   bool instrumented = false;
 693
 694   stmt = gsi_stmt (*gsi);
 695   if (is_gimple_call (stmt)
 696       && (gimple_call_fndecl (stmt)
 697           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 698     {
 699       /* All functions with function call will have exit instrumented,
 700          therefore no function calls other than __tsan_func_exit
 701          shall appear in the functions.  */
 702       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 703       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 704         instrument_builtin_call (gsi);
 705       return true;
 706     }
 707   else if (is_gimple_assign (stmt)
 708            && !gimple_clobber_p (stmt))
 709     {
 710       if (gimple_store_p (stmt))
 711         {
 712           lhs = gimple_assign_lhs (stmt);
 713           instrumented = instrument_expr (*gsi, lhs, true);
 714         }
 715       if (gimple_assign_load_p (stmt))
 716         {
 717           rhs = gimple_assign_rhs1 (stmt);
 718           instrumented = instrument_expr (*gsi, rhs, false);
 719         }
 720     }
 721   return instrumented;
 722 }
 723
 724 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 725
 726 static void
 727 replace_func_exit (gimple *stmt)
 728 {
 729   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 730   gimple *g = gimple_build_call (builtin_decl, 0);
 731   gimple_set_location (g, cfun->function_end_locus);
 732   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 733   gsi_replace (&gsi, g, true);
 734 }
 735
 736 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 737
 738 static void
 739 instrument_func_exit (void)
 740 {
 741   location_t loc;
 742   basic_block exit_bb;
 743   gimple_stmt_iterator gsi;
 744   gimple *stmt, *g;
 745   tree builtin_decl;
 746   edge e;
 747   edge_iterator ei;
 748
 749   /* Find all function exits.  */
 750   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 751   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 752     {
 753       gsi = gsi_last_bb (e->src);
 754       stmt = gsi_stmt (gsi);
 755       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 756                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 757       loc = gimple_location (stmt);
 758       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 759       g = gimple_build_call (builtin_decl, 0);
 760       gimple_set_location (g, loc);
 761       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 762     }
 763 }
 764
 765 /* Instruments all interesting memory accesses in the current function.
 766    Return true if func entry/exit should be instrumented.  */
 767
 768 static bool
 769 instrument_memory_accesses (void)
 770 {
 771   basic_block bb;
 772   gimple_stmt_iterator gsi;
 773   bool fentry_exit_instrument = false;
 774   bool func_exit_seen = false;
 775   auto_vec<gimple *> tsan_func_exits;
 776
 777   FOR_EACH_BB_FN (bb, cfun)
 778     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 779       {
 780         gimple *stmt = gsi_stmt (gsi);
 781         if (gimple_call_internal_p (stmt, IFN_TSAN_FUNC_EXIT))
 782           {
 783             if (fentry_exit_instrument)
 784               replace_func_exit (stmt);
 785             else
 786               tsan_func_exits.safe_push (stmt);
 787             func_exit_seen = true;
 788           }
 789         else
 790           fentry_exit_instrument |= instrument_gimple (&gsi);
 791       }
 792   unsigned int i;
 793   gimple *stmt;
 794   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 795     if (fentry_exit_instrument)
 796       replace_func_exit (stmt);
 797     else
 798       {
 799         gsi = gsi_for_stmt (stmt);
 800         gsi_remove (&gsi, true);
 801       }
 802   if (fentry_exit_instrument && !func_exit_seen)
 803     instrument_func_exit ();
 804   return fentry_exit_instrument;
 805 }
 806
 807 /* Instruments function entry.  */
 808
 809 static void
 810 instrument_func_entry (void)
 811 {
 812   tree ret_addr, builtin_decl;
 813   gimple *g;
 814   gimple_seq seq = NULL;
 815
 816   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 817   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 818   ret_addr = make_ssa_name (ptr_type_node);
 819   gimple_call_set_lhs (g, ret_addr);
 820   gimple_set_location (g, cfun->function_start_locus);
 821   gimple_seq_add_stmt_without_update (&seq, g);
 822
 823   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 824   g = gimple_build_call (builtin_decl, 1, ret_addr);
 825   gimple_set_location (g, cfun->function_start_locus);
 826   gimple_seq_add_stmt_without_update (&seq, g);
 827
 828   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 829   gsi_insert_seq_on_edge_immediate (e, seq);
 830 }
 831
 832 /* ThreadSanitizer instrumentation pass.  */
 833
 834 static unsigned
 835 tsan_pass (void)
 836 {
 837   initialize_sanitizer_builtins ();
 838   if (instrument_memory_accesses ())
 839     instrument_func_entry ();
 840   return 0;
 841 }
 842
 843 /* Inserts __tsan_init () into the list of CTORs.  */
 844
 845 void
 846 tsan_finish_file (void)
 847 {
 848   tree ctor_statements = NULL_TREE;
 849
 850   initialize_sanitizer_builtins ();
 851   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 852   append_to_statement_list (build_call_expr (init_decl, 0),
 853                             &ctor_statements);
 854   cgraph_build_static_cdtor ('I', ctor_statements,
 855                              MAX_RESERVED_INIT_PRIORITY - 1);
 856 }
 857
 858 /* The pass descriptor.  */
 859
 860 namespace {
 861
 862 const pass_data pass_data_tsan =
 863 {
 864   GIMPLE_PASS, /* type */
 865   "tsan", /* name */
 866   OPTGROUP_NONE, /* optinfo_flags */
 867   TV_NONE, /* tv_id */
 868   ( PROP_ssa | PROP_cfg ), /* properties_required */
 869   0, /* properties_provided */
 870   0, /* properties_destroyed */
 871   0, /* todo_flags_start */
 872   TODO_update_ssa, /* todo_flags_finish */
 873 };
 874
 875 class pass_tsan : public gimple_opt_pass
 876 {
 877 public:
 878   pass_tsan (gcc::context *ctxt)
 879     : gimple_opt_pass (pass_data_tsan, ctxt)
 880   {}
 881
 882   /* opt_pass methods: */
 883   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 884   virtual bool gate (function *)
 885 {
 886   return ((flag_sanitize & SANITIZE_THREAD) != 0
 887           && !lookup_attribute ("no_sanitize_thread",
 888                                 DECL_ATTRIBUTES (current_function_decl)));
 889 }
 890
 891   virtual unsigned int execute (function *) { return tsan_pass (); }
 892
 893 }; // class pass_tsan
 894
 895 } // anon namespace
 896
 897 gimple_opt_pass *
 898 make_pass_tsan (gcc::context *ctxt)
 899 {
 900   return new pass_tsan (ctxt);
 901 }
 902
 903 namespace {
 904
 905 const pass_data pass_data_tsan_O0 =
 906 {
 907   GIMPLE_PASS, /* type */
 908   "tsan0", /* name */
 909   OPTGROUP_NONE, /* optinfo_flags */
 910   TV_NONE, /* tv_id */
 911   ( PROP_ssa | PROP_cfg ), /* properties_required */
 912   0, /* properties_provided */
 913   0, /* properties_destroyed */
 914   0, /* todo_flags_start */
 915   TODO_update_ssa, /* todo_flags_finish */
 916 };
 917
 918 class pass_tsan_O0 : public gimple_opt_pass
 919 {
 920 public:
 921   pass_tsan_O0 (gcc::context *ctxt)
 922     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 923   {}
 924
 925   /* opt_pass methods: */
 926   virtual bool gate (function *)
 927     {
 928       return ((flag_sanitize & SANITIZE_THREAD) != 0 && !optimize
 929               && !lookup_attribute ("no_sanitize_thread",
 930                                     DECL_ATTRIBUTES (current_function_decl)));
 931     }
 932
 933   virtual unsigned int execute (function *) { return tsan_pass (); }
 934
 935 }; // class pass_tsan_O0
 936
 937 } // anon namespace
 938
 939 gimple_opt_pass *
 940 make_pass_tsan_O0 (gcc::context *ctxt)
 941 {
 942   return new pass_tsan_O0 (ctxt);
 943 }