gcc/tsan.cc

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2025 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 "gimple-fold.h"
  40 #include "tree-ssa-loop-ivopts.h"
  41 #include "tree-eh.h"
  42 #include "tsan.h"
  43 #include "stringpool.h"
  44 #include "attribs.h"
  45 #include "asan.h"
  46 #include "builtins.h"
  47 #include "target.h"
  48 #include "diagnostic-core.h"
  49
  50 /* Number of instrumented memory accesses in the current function.  */
  51
  52 /* Builds the following decl
  53    void __tsan_read/writeX (void *addr);  */
  54
  55 static tree
  56 get_memory_access_decl (bool is_write, unsigned size, bool volatilep)
  57 {
  58   enum built_in_function fcode;
  59   int pos;
  60
  61   if (size <= 1)
  62     pos = 0;
  63   else if (size <= 3)
  64     pos = 1;
  65   else if (size <= 7)
  66     pos = 2;
  67   else if (size <= 15)
  68     pos = 3;
  69   else
  70     pos = 4;
  71
  72   if (param_tsan_distinguish_volatile && volatilep)
  73     fcode = is_write ? BUILT_IN_TSAN_VOLATILE_WRITE1
  74                      : BUILT_IN_TSAN_VOLATILE_READ1;
  75   else
  76     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  77                      : BUILT_IN_TSAN_READ1;
  78   fcode = (built_in_function)(fcode + pos);
  79
  80   return builtin_decl_implicit (fcode);
  81 }
  82
  83 /* Check as to whether EXPR refers to a store to vptr.  */
  84
  85 static tree
  86 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  87 {
  88   if (is_write == true
  89       && gimple_assign_single_p (stmt)
  90       && TREE_CODE (expr) == COMPONENT_REF)
  91     {
  92       tree field = TREE_OPERAND (expr, 1);
  93       if (TREE_CODE (field) == FIELD_DECL
  94           && DECL_VIRTUAL_P (field))
  95         return gimple_assign_rhs1 (stmt);
  96     }
  97   return NULL;
  98 }
  99
 100 /* Instruments EXPR if needed. If any instrumentation is inserted,
 101    return true.  */
 102
 103 static bool
 104 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 105 {
 106   tree base, rhs, expr_ptr, builtin_decl;
 107   basic_block bb;
 108   HOST_WIDE_INT size;
 109   gimple *stmt, *g;
 110   gimple_seq seq;
 111   location_t loc;
 112   unsigned int align;
 113
 114   size = int_size_in_bytes (TREE_TYPE (expr));
 115   if (size <= 0)
 116     return false;
 117
 118   poly_int64 unused_bitsize, unused_bitpos;
 119   tree offset;
 120   machine_mode mode;
 121   int unsignedp, reversep, volatilep = 0;
 122   base = get_inner_reference (expr, &unused_bitsize, &unused_bitpos, &offset,
 123                               &mode, &unsignedp, &reversep, &volatilep);
 124
 125   /* No need to instrument accesses to decls that don't escape,
 126      they can't escape to other threads then.  */
 127   if (DECL_P (base) && !is_global_var (base))
 128     {
 129       struct pt_solution pt;
 130       memset (&pt, 0, sizeof (pt));
 131       pt.escaped = 1;
 132       pt.ipa_escaped = flag_ipa_pta != 0;
 133       if (!pt_solution_includes (&pt, base))
 134         return false;
 135       if (!may_be_aliased (base))
 136         return false;
 137     }
 138
 139   if (TREE_READONLY (base) || (VAR_P (base) && DECL_HARD_REGISTER (base)))
 140     return false;
 141
 142   if (!ADDR_SPACE_GENERIC_P (TYPE_ADDR_SPACE (TREE_TYPE (base))))
 143     return false;
 144
 145   stmt = gsi_stmt (gsi);
 146   loc = gimple_location (stmt);
 147   rhs = is_vptr_store (stmt, expr, is_write);
 148
 149   if ((TREE_CODE (expr) == COMPONENT_REF
 150        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 151       || TREE_CODE (expr) == BIT_FIELD_REF)
 152     {
 153       HOST_WIDE_INT bitpos, bitsize;
 154       base = TREE_OPERAND (expr, 0);
 155       if (TREE_CODE (expr) == COMPONENT_REF)
 156         {
 157           expr = TREE_OPERAND (expr, 1);
 158           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 159             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 160           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 161               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 162               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 163             return false;
 164           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 165                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 166           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 167         }
 168       else
 169         {
 170           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 171               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 172             return false;
 173           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 174           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 175         }
 176       if (bitpos < 0 || bitsize <= 0)
 177         return false;
 178       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 179              / BITS_PER_UNIT;
 180       if (may_be_nonaddressable_p (base))
 181         return false;
 182       align = get_object_alignment (base);
 183       if (align < BITS_PER_UNIT)
 184         return false;
 185       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 186       if ((align - 1) & bitpos)
 187         {
 188           align = (align - 1) & bitpos;
 189           align = least_bit_hwi (align);
 190         }
 191       expr = build_fold_addr_expr (unshare_expr (base));
 192       expr = build2 (MEM_REF, char_type_node, expr,
 193                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 194       expr_ptr = build_fold_addr_expr (expr);
 195     }
 196   else
 197     {
 198       if (may_be_nonaddressable_p (expr))
 199         return false;
 200       align = get_object_alignment (expr);
 201       if (align < BITS_PER_UNIT)
 202         return false;
 203       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 204     }
 205   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 206   if ((size & (size - 1)) != 0 || size > 16
 207       || align < MIN (size, 8) * BITS_PER_UNIT)
 208     {
 209       builtin_decl = builtin_decl_implicit (is_write
 210                                             ? BUILT_IN_TSAN_WRITE_RANGE
 211                                             : BUILT_IN_TSAN_READ_RANGE);
 212       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 213     }
 214   else if (rhs == NULL)
 215     g = gimple_build_call (get_memory_access_decl (is_write, size,
 216                                                    TREE_THIS_VOLATILE (expr)),
 217                            1, expr_ptr);
 218   else
 219     {
 220       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 221       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 222     }
 223   gimple_set_location (g, loc);
 224   gimple_seq_add_stmt_without_update (&seq, g);
 225   /* Instrumentation for assignment of a function result
 226      must be inserted after the call.  Instrumentation for
 227      reads of function arguments must be inserted before the call.
 228      That's because the call can contain synchronization.  */
 229   if (is_gimple_call (stmt) && is_write)
 230     {
 231       /* If the call can throw, it must be the last stmt in
 232          a basic block, so the instrumented stmts need to be
 233          inserted in successor bbs.  */
 234       if (is_ctrl_altering_stmt (stmt))
 235         {
 236           edge e;
 237
 238           bb = gsi_bb (gsi);
 239           e = find_fallthru_edge (bb->succs);
 240           if (e)
 241             gsi_insert_seq_on_edge_immediate (e, seq);
 242         }
 243       else
 244         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 245     }
 246   else
 247     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 248
 249   return true;
 250 }
 251
 252 /* Actions for sync/atomic builtin transformations.  */
 253 enum tsan_atomic_action
 254 {
 255   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 256   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst,
 257   bool_clear, bool_test_and_set
 258 };
 259
 260 /* Table how to map sync/atomic builtins to their corresponding
 261    tsan equivalents.  */
 262 static const struct tsan_map_atomic
 263 {
 264   enum built_in_function fcode, tsan_fcode;
 265   enum tsan_atomic_action action;
 266   enum tree_code code;
 267 } tsan_atomic_table[] =
 268 {
 269 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 270   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 271 #define CHECK_LAST(fcode, tsan_fcode) \
 272   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 273 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 274   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 275 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 276   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 277 #define WEAK_CAS(fcode, tsan_fcode) \
 278   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 279 #define STRONG_CAS(fcode, tsan_fcode) \
 280   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 281 #define BOOL_CAS(fcode, tsan_fcode) \
 282   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 283 #define VAL_CAS(fcode, tsan_fcode) \
 284   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 285 #define LOCK_RELEASE(fcode, tsan_fcode) \
 286   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 287 #define FETCH_OP(fcode, tsan_fcode, code) \
 288   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 289 #define FETCH_OPS(fcode, tsan_fcode, code) \
 290   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 291 #define BOOL_CLEAR(fcode, tsan_fcode) \
 292   TRANSFORM (fcode, tsan_fcode, bool_clear, ERROR_MARK)
 293 #define BOOL_TEST_AND_SET(fcode, tsan_fcode) \
 294   TRANSFORM (fcode, tsan_fcode, bool_test_and_set, ERROR_MARK)
 295
 296   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 297   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 298   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 299   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 300   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 301   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 302   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 303   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 304   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 305   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 306   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 307   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 308   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 309   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 310   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 311   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 312   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 313   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 314   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 315   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 316   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 317   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 318   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 319   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 320   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 321   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 322   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 323   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 324   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 325   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 326   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 327   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 328   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 329   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 330   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 331   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 332   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 333   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 334   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 335   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 336   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 337   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 338   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 339   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 340   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 341
 342   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 343   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 344
 345   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 346   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 347   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 348   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 349   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 350   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 351   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 352   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 353   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 354   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 355   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 356   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 357   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 358   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 359   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 360   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 361   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 362   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 363   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 364   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 365   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 366   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 367   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 368   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 369   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 370   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 371   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 372   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 373   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 374   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 375
 376   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 377   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 378   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 379   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 380   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 381
 382   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 383   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 384   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 385   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 386   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 387   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 388   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 389   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 390   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 391   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 392   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 393   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 394   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 395   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 396   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 397   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 398   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 399   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 400   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 401   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 402   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 403   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 404   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 405   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 406   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 407   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 408   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 409   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 410   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 411   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 412
 413   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 414
 415   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 416   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 417   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 418   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 419   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 420   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 421   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 422   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 423   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 424   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 425   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 426   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 427   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 428   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 429   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 430   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 431   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 432   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 433   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 434   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 435   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 436   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 437   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 438   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 439   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 440   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 441   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 442   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 443   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 444   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 445
 446   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 447   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 448   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 449   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 450   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 451
 452   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 453   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 454               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 455   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 456               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 457   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 458               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 459   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 460               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 461
 462   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 463             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 464   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 465             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 466   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 467             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 468   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 469             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 470   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 471             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 472
 473   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 474   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 475   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 476   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 477   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 478            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 479
 480   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 481   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 482   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 483   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 484   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE),
 485
 486   BOOL_CLEAR (ATOMIC_CLEAR, TSAN_ATOMIC8_STORE),
 487
 488   BOOL_TEST_AND_SET (ATOMIC_TEST_AND_SET, TSAN_ATOMIC8_EXCHANGE)
 489 };
 490
 491 /* Instrument an atomic builtin.  */
 492
 493 static void
 494 instrument_builtin_call (gimple_stmt_iterator *gsi)
 495 {
 496   gimple *stmt = gsi_stmt (*gsi), *g;
 497   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 498   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 499   unsigned int i, num = gimple_call_num_args (stmt), j;
 500   for (j = 0; j < 6 && j < num; j++)
 501     args[j] = gimple_call_arg (stmt, j);
 502   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 503     if (fcode != tsan_atomic_table[i].fcode)
 504       continue;
 505     else
 506       {
 507         if (fcode == BUILT_IN_ATOMIC_THREAD_FENCE)
 508           warning_at (gimple_location (stmt), OPT_Wtsan,
 509                       "%qs is not supported with %qs", "atomic_thread_fence",
 510                       "-fsanitize=thread");
 511
 512         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 513         if (decl == NULL_TREE)
 514           return;
 515         switch (tsan_atomic_table[i].action)
 516           {
 517           case check_last:
 518           case fetch_op:
 519             last_arg = gimple_call_arg (stmt, num - 1);
 520             if (tree_fits_uhwi_p (last_arg)
 521                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 522               return;
 523             gimple_call_set_fndecl (stmt, decl);
 524             update_stmt (stmt);
 525             maybe_clean_eh_stmt (stmt);
 526             if (tsan_atomic_table[i].action == fetch_op)
 527               {
 528                 args[1] = gimple_call_arg (stmt, 1);
 529                 goto adjust_result;
 530               }
 531             return;
 532           case add_seq_cst:
 533           case add_acquire:
 534           case fetch_op_seq_cst:
 535             gcc_assert (num <= 2);
 536             for (j = 0; j < num; j++)
 537               args[j] = gimple_call_arg (stmt, j);
 538             for (; j < 2; j++)
 539               args[j] = NULL_TREE;
 540             args[num] = build_int_cst (NULL_TREE,
 541                                        tsan_atomic_table[i].action
 542                                        != add_acquire
 543                                        ? MEMMODEL_SEQ_CST
 544                                        : MEMMODEL_ACQUIRE);
 545             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 546             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 547             stmt = gsi_stmt (*gsi);
 548             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 549               {
 550               adjust_result:
 551                 lhs = gimple_call_lhs (stmt);
 552                 if (lhs == NULL_TREE)
 553                   return;
 554                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 555                                                 TREE_TYPE (args[1])))
 556                   {
 557                     tree var = make_ssa_name (TREE_TYPE (lhs));
 558                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 559                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 560                     args[1] = var;
 561                   }
 562                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 563                 /* BIT_NOT_EXPR stands for NAND.  */
 564                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 565                   {
 566                     tree var = make_ssa_name (TREE_TYPE (lhs));
 567                     g = gimple_build_assign (var, BIT_AND_EXPR,
 568                                              gimple_call_lhs (stmt), args[1]);
 569                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 570                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 571                   }
 572                 else
 573                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 574                                            gimple_call_lhs (stmt), args[1]);
 575                 update_stmt (stmt);
 576                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 577               }
 578             return;
 579           case weak_cas:
 580             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 581               continue;
 582             /* FALLTHRU */
 583           case strong_cas:
 584             gcc_assert (num == 6);
 585             for (j = 0; j < 6; j++)
 586               args[j] = gimple_call_arg (stmt, j);
 587             if (tree_fits_uhwi_p (args[4])
 588                 && memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 589               return;
 590             if (tree_fits_uhwi_p (args[5])
 591                 && memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 592               return;
 593             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 594                                 args[4], args[5]);
 595             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 596             return;
 597           case bool_cas:
 598           case val_cas:
 599             gcc_assert (num == 3);
 600             for (j = 0; j < 3; j++)
 601               args[j] = gimple_call_arg (stmt, j);
 602             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 603             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 604             t = create_tmp_var (t);
 605             mark_addressable (t);
 606             if (!useless_type_conversion_p (TREE_TYPE (t),
 607                                             TREE_TYPE (args[1])))
 608               {
 609                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 610                                          NOP_EXPR, args[1]);
 611                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 612                 args[1] = gimple_assign_lhs (g);
 613               }
 614             g = gimple_build_assign (t, args[1]);
 615             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 616             lhs = gimple_call_lhs (stmt);
 617             update_gimple_call (gsi, decl, 5, args[0],
 618                                 build_fold_addr_expr (t), args[2],
 619                                 build_int_cst (NULL_TREE,
 620                                                MEMMODEL_SEQ_CST),
 621                                 build_int_cst (NULL_TREE,
 622                                                MEMMODEL_SEQ_CST));
 623             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 624             if (tsan_atomic_table[i].action == val_cas && lhs)
 625               {
 626                 stmt = gsi_stmt (*gsi);
 627                 tree t2 = make_ssa_name (TREE_TYPE (t));
 628                 g = gimple_build_assign (t2, t);
 629                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 630                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 631                 tree cond = make_ssa_name (boolean_type_node);
 632                 g = gimple_build_assign (cond, NE_EXPR,
 633                                          t, build_zero_cst (TREE_TYPE (t)));
 634                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 635                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1], t2);
 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             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 650             return;
 651           case bool_clear:
 652           case bool_test_and_set:
 653             if (BOOL_TYPE_SIZE != 8)
 654               {
 655                 decl = NULL_TREE;
 656                 for (j = 1; j < 5; j++)
 657                   if (BOOL_TYPE_SIZE == (8 << j))
 658                     {
 659                       enum built_in_function tsan_fcode
 660                         = (enum built_in_function)
 661                           (tsan_atomic_table[i].tsan_fcode + j);
 662                       decl = builtin_decl_implicit (tsan_fcode);
 663                       break;
 664                     }
 665                 if (decl == NULL_TREE)
 666                   return;
 667               }
 668             last_arg = gimple_call_arg (stmt, num - 1);
 669             if (tree_fits_uhwi_p (last_arg)
 670                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 671               return;
 672             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 673             t = TREE_VALUE (TREE_CHAIN (t));
 674             if (tsan_atomic_table[i].action == bool_clear)
 675               {
 676                 update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 677                                     build_int_cst (t, 0), last_arg);
 678                 maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 679                 return;
 680               }
 681             t = build_int_cst (t, targetm.atomic_test_and_set_trueval);
 682             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 683                                 t, last_arg);
 684             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 685             stmt = gsi_stmt (*gsi);
 686             lhs = gimple_call_lhs (stmt);
 687             if (lhs == NULL_TREE)
 688               return;
 689             if (targetm.atomic_test_and_set_trueval != 1
 690                 || !useless_type_conversion_p (TREE_TYPE (lhs),
 691                                                TREE_TYPE (t)))
 692               {
 693                 tree new_lhs = make_ssa_name (TREE_TYPE (t));
 694                 gimple_call_set_lhs (stmt, new_lhs);
 695                 if (targetm.atomic_test_and_set_trueval != 1)
 696                   g = gimple_build_assign (lhs, NE_EXPR, new_lhs,
 697                                            build_int_cst (TREE_TYPE (t), 0));
 698                 else
 699                   g = gimple_build_assign (lhs, NOP_EXPR, new_lhs);
 700                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 701                 update_stmt (stmt);
 702               }
 703             return;
 704           default:
 705             continue;
 706           }
 707       }
 708 }
 709
 710 /* Instruments the gimple pointed to by GSI. Return
 711    true if func entry/exit should be instrumented.  */
 712
 713 static bool
 714 instrument_gimple (gimple_stmt_iterator *gsi)
 715 {
 716   gimple *stmt;
 717   tree rhs, lhs;
 718   bool instrumented = false;
 719
 720   stmt = gsi_stmt (*gsi);
 721   if (is_gimple_call (stmt)
 722       && (gimple_call_fndecl (stmt)
 723           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 724     {
 725       /* All functions with function call will have exit instrumented,
 726          therefore no function calls other than __tsan_func_exit
 727          shall appear in the functions.  */
 728       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 729       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 730         instrument_builtin_call (gsi);
 731       return true;
 732     }
 733   else if (is_gimple_assign (stmt)
 734            && !gimple_clobber_p (stmt))
 735     {
 736       if (gimple_store_p (stmt))
 737         {
 738           lhs = gimple_assign_lhs (stmt);
 739           instrumented = instrument_expr (*gsi, lhs, true);
 740         }
 741       if (gimple_assign_load_p (stmt))
 742         {
 743           rhs = gimple_assign_rhs1 (stmt);
 744           instrumented = instrument_expr (*gsi, rhs, false);
 745         }
 746     }
 747   return instrumented;
 748 }
 749
 750 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 751
 752 static void
 753 replace_func_exit (gimple *stmt)
 754 {
 755   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 756   gimple *g = gimple_build_call (builtin_decl, 0);
 757   gimple_set_location (g, cfun->function_end_locus);
 758   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 759   gsi_replace (&gsi, g, true);
 760 }
 761
 762 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 763
 764 static void
 765 instrument_func_exit (void)
 766 {
 767   location_t loc;
 768   basic_block exit_bb;
 769   gimple_stmt_iterator gsi;
 770   gimple *stmt, *g;
 771   tree builtin_decl;
 772   edge e;
 773   edge_iterator ei;
 774
 775   /* Find all function exits.  */
 776   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 777   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 778     {
 779       gsi = gsi_last_bb (e->src);
 780       stmt = gsi_stmt (gsi);
 781       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 782                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 783       loc = gimple_location (stmt);
 784       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 785       g = gimple_build_call (builtin_decl, 0);
 786       gimple_set_location (g, loc);
 787       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 788     }
 789 }
 790
 791 /* Instruments all interesting memory accesses in the current function.
 792    Return true if func entry/exit should be instrumented.  */
 793
 794 static bool
 795 instrument_memory_accesses (bool *cfg_changed)
 796 {
 797   basic_block bb;
 798   gimple_stmt_iterator gsi;
 799   bool fentry_exit_instrument = false;
 800   bool func_exit_seen = false;
 801   auto_vec<gimple *> tsan_func_exits;
 802
 803   FOR_EACH_BB_FN (bb, cfun)
 804     {
 805       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 806         {
 807           gimple *stmt = gsi_stmt (gsi);
 808           if (gimple_call_internal_p (stmt, IFN_TSAN_FUNC_EXIT))
 809             {
 810               if (fentry_exit_instrument)
 811                 replace_func_exit (stmt);
 812               else
 813                 tsan_func_exits.safe_push (stmt);
 814               func_exit_seen = true;
 815             }
 816           else
 817             fentry_exit_instrument
 818               |= (instrument_gimple (&gsi)
 819                   && param_tsan_instrument_func_entry_exit);
 820         }
 821       if (gimple_purge_dead_eh_edges (bb))
 822         *cfg_changed = true;
 823     }
 824   unsigned int i;
 825   gimple *stmt;
 826   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 827     if (fentry_exit_instrument)
 828       replace_func_exit (stmt);
 829     else
 830       {
 831         gsi = gsi_for_stmt (stmt);
 832         gsi_remove (&gsi, true);
 833       }
 834   if (fentry_exit_instrument && !func_exit_seen)
 835     instrument_func_exit ();
 836   return fentry_exit_instrument;
 837 }
 838
 839 /* Instruments function entry.  */
 840
 841 static void
 842 instrument_func_entry (void)
 843 {
 844   tree ret_addr, builtin_decl;
 845   gimple *g;
 846   gimple_seq seq = NULL;
 847
 848   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 849   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 850   ret_addr = make_ssa_name (ptr_type_node);
 851   gimple_call_set_lhs (g, ret_addr);
 852   gimple_set_location (g, cfun->function_start_locus);
 853   gimple_seq_add_stmt_without_update (&seq, g);
 854
 855   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 856   g = gimple_build_call (builtin_decl, 1, ret_addr);
 857   gimple_set_location (g, cfun->function_start_locus);
 858   gimple_seq_add_stmt_without_update (&seq, g);
 859
 860   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 861   gsi_insert_seq_on_edge_immediate (e, seq);
 862 }
 863
 864 /* ThreadSanitizer instrumentation pass.  */
 865
 866 static unsigned
 867 tsan_pass (void)
 868 {
 869   initialize_sanitizer_builtins ();
 870   bool cfg_changed = false;
 871   if (instrument_memory_accesses (&cfg_changed))
 872     instrument_func_entry ();
 873   return cfg_changed ? TODO_cleanup_cfg : 0;
 874 }
 875
 876 /* Inserts __tsan_init () into the list of CTORs.  */
 877
 878 void
 879 tsan_finish_file (void)
 880 {
 881   tree ctor_statements = NULL_TREE;
 882
 883   initialize_sanitizer_builtins ();
 884   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 885   append_to_statement_list (build_call_expr (init_decl, 0),
 886                             &ctor_statements);
 887   cgraph_build_static_cdtor ('I', ctor_statements,
 888                              MAX_RESERVED_INIT_PRIORITY - 1);
 889 }
 890
 891 /* The pass descriptor.  */
 892
 893 namespace {
 894
 895 const pass_data pass_data_tsan =
 896 {
 897   GIMPLE_PASS, /* type */
 898   "tsan", /* name */
 899   OPTGROUP_NONE, /* optinfo_flags */
 900   TV_NONE, /* tv_id */
 901   ( PROP_ssa | PROP_cfg ), /* properties_required */
 902   0, /* properties_provided */
 903   0, /* properties_destroyed */
 904   0, /* todo_flags_start */
 905   TODO_update_ssa, /* todo_flags_finish */
 906 };
 907
 908 class pass_tsan : public gimple_opt_pass
 909 {
 910 public:
 911   pass_tsan (gcc::context *ctxt)
 912     : gimple_opt_pass (pass_data_tsan, ctxt)
 913   {}
 914
 915   /* opt_pass methods: */
 916   opt_pass * clone () final override { return new pass_tsan (m_ctxt); }
 917   bool gate (function *) final override
 918 {
 919   return sanitize_flags_p (SANITIZE_THREAD);
 920 }
 921
 922   unsigned int execute (function *) final override { return tsan_pass (); }
 923
 924 }; // class pass_tsan
 925
 926 } // anon namespace
 927
 928 gimple_opt_pass *
 929 make_pass_tsan (gcc::context *ctxt)
 930 {
 931   return new pass_tsan (ctxt);
 932 }
 933
 934 namespace {
 935
 936 const pass_data pass_data_tsan_O0 =
 937 {
 938   GIMPLE_PASS, /* type */
 939   "tsan0", /* name */
 940   OPTGROUP_NONE, /* optinfo_flags */
 941   TV_NONE, /* tv_id */
 942   ( PROP_ssa | PROP_cfg ), /* properties_required */
 943   0, /* properties_provided */
 944   0, /* properties_destroyed */
 945   0, /* todo_flags_start */
 946   TODO_update_ssa, /* todo_flags_finish */
 947 };
 948
 949 class pass_tsan_O0 : public gimple_opt_pass
 950 {
 951 public:
 952   pass_tsan_O0 (gcc::context *ctxt)
 953     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 954   {}
 955
 956   /* opt_pass methods: */
 957   bool gate (function *) final override
 958     {
 959       return (sanitize_flags_p (SANITIZE_THREAD) && !optimize);
 960     }
 961
 962   unsigned int execute (function *) final override { return tsan_pass (); }
 963
 964 }; // class pass_tsan_O0
 965
 966 } // anon namespace
 967
 968 gimple_opt_pass *
 969 make_pass_tsan_O0 (gcc::context *ctxt)
 970 {
 971   return new pass_tsan_O0 (ctxt);
 972 }