gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2019 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 "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
  49 /* Number of instrumented memory accesses in the current function.  */
  50
  51 /* Builds the following decl
  52    void __tsan_read/writeX (void *addr);  */
  53
  54 static tree
  55 get_memory_access_decl (bool is_write, unsigned size)
  56 {
  57   enum built_in_function fcode;
  58
  59   if (size <= 1)
  60     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  61                      : BUILT_IN_TSAN_READ1;
  62   else if (size <= 3)
  63     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  64                      : BUILT_IN_TSAN_READ2;
  65   else if (size <= 7)
  66     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  67                      : BUILT_IN_TSAN_READ4;
  68   else if (size <= 15)
  69     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  70                      : BUILT_IN_TSAN_READ8;
  71   else
  72     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  73                      : BUILT_IN_TSAN_READ16;
  74
  75   return builtin_decl_implicit (fcode);
  76 }
  77
  78 /* Check as to whether EXPR refers to a store to vptr.  */
  79
  80 static tree
  81 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  82 {
  83   if (is_write == true
  84       && gimple_assign_single_p (stmt)
  85       && TREE_CODE (expr) == COMPONENT_REF)
  86     {
  87       tree field = TREE_OPERAND (expr, 1);
  88       if (TREE_CODE (field) == FIELD_DECL
  89           && DECL_VIRTUAL_P (field))
  90         return gimple_assign_rhs1 (stmt);
  91     }
  92   return NULL;
  93 }
  94
  95 /* Instruments EXPR if needed. If any instrumentation is inserted,
  96    return true.  */
  97
  98 static bool
  99 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 100 {
 101   tree base, rhs, expr_ptr, builtin_decl;
 102   basic_block bb;
 103   HOST_WIDE_INT size;
 104   gimple *stmt, *g;
 105   gimple_seq seq;
 106   location_t loc;
 107   unsigned int align;
 108
 109   size = int_size_in_bytes (TREE_TYPE (expr));
 110   if (size <= 0)
 111     return false;
 112
 113   poly_int64 unused_bitsize, unused_bitpos;
 114   tree offset;
 115   machine_mode mode;
 116   int unsignedp, reversep, volatilep = 0;
 117   base = get_inner_reference (expr, &unused_bitsize, &unused_bitpos, &offset,
 118                               &mode, &unsignedp, &reversep, &volatilep);
 119
 120   /* No need to instrument accesses to decls that don't escape,
 121      they can't escape to other threads then.  */
 122   if (DECL_P (base) && !is_global_var (base))
 123     {
 124       struct pt_solution pt;
 125       memset (&pt, 0, sizeof (pt));
 126       pt.escaped = 1;
 127       pt.ipa_escaped = flag_ipa_pta != 0;
 128       if (!pt_solution_includes (&pt, base))
 129         return false;
 130       if (!may_be_aliased (base))
 131         return false;
 132     }
 133
 134   if (TREE_READONLY (base) || (VAR_P (base) && DECL_HARD_REGISTER (base)))
 135     return false;
 136
 137   stmt = gsi_stmt (gsi);
 138   loc = gimple_location (stmt);
 139   rhs = is_vptr_store (stmt, expr, is_write);
 140
 141   if ((TREE_CODE (expr) == COMPONENT_REF
 142        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 143       || TREE_CODE (expr) == BIT_FIELD_REF)
 144     {
 145       HOST_WIDE_INT bitpos, bitsize;
 146       base = TREE_OPERAND (expr, 0);
 147       if (TREE_CODE (expr) == COMPONENT_REF)
 148         {
 149           expr = TREE_OPERAND (expr, 1);
 150           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 151             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 152           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 153               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 154               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 155             return false;
 156           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 157                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 158           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 159         }
 160       else
 161         {
 162           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 163               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 164             return false;
 165           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 166           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 167         }
 168       if (bitpos < 0 || bitsize <= 0)
 169         return false;
 170       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 171              / BITS_PER_UNIT;
 172       if (may_be_nonaddressable_p (base))
 173         return false;
 174       align = get_object_alignment (base);
 175       if (align < BITS_PER_UNIT)
 176         return false;
 177       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 178       if ((align - 1) & bitpos)
 179         {
 180           align = (align - 1) & bitpos;
 181           align = least_bit_hwi (align);
 182         }
 183       expr = build_fold_addr_expr (unshare_expr (base));
 184       expr = build2 (MEM_REF, char_type_node, expr,
 185                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 186       expr_ptr = build_fold_addr_expr (expr);
 187     }
 188   else
 189     {
 190       if (may_be_nonaddressable_p (expr))
 191         return false;
 192       align = get_object_alignment (expr);
 193       if (align < BITS_PER_UNIT)
 194         return false;
 195       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 196     }
 197   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 198   if ((size & (size - 1)) != 0 || size > 16
 199       || align < MIN (size, 8) * BITS_PER_UNIT)
 200     {
 201       builtin_decl = builtin_decl_implicit (is_write
 202                                             ? BUILT_IN_TSAN_WRITE_RANGE
 203                                             : BUILT_IN_TSAN_READ_RANGE);
 204       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 205     }
 206   else if (rhs == NULL)
 207     g = gimple_build_call (get_memory_access_decl (is_write, size),
 208                            1, expr_ptr);
 209   else
 210     {
 211       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 212       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 213     }
 214   gimple_set_location (g, loc);
 215   gimple_seq_add_stmt_without_update (&seq, g);
 216   /* Instrumentation for assignment of a function result
 217      must be inserted after the call.  Instrumentation for
 218      reads of function arguments must be inserted before the call.
 219      That's because the call can contain synchronization.  */
 220   if (is_gimple_call (stmt) && is_write)
 221     {
 222       /* If the call can throw, it must be the last stmt in
 223          a basic block, so the instrumented stmts need to be
 224          inserted in successor bbs.  */
 225       if (is_ctrl_altering_stmt (stmt))
 226         {
 227           edge e;
 228
 229           bb = gsi_bb (gsi);
 230           e = find_fallthru_edge (bb->succs);
 231           if (e)
 232             gsi_insert_seq_on_edge_immediate (e, seq);
 233         }
 234       else
 235         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 236     }
 237   else
 238     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 239
 240   return true;
 241 }
 242
 243 /* Actions for sync/atomic builtin transformations.  */
 244 enum tsan_atomic_action
 245 {
 246   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 247   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst,
 248   bool_clear, bool_test_and_set
 249 };
 250
 251 /* Table how to map sync/atomic builtins to their corresponding
 252    tsan equivalents.  */
 253 static const struct tsan_map_atomic
 254 {
 255   enum built_in_function fcode, tsan_fcode;
 256   enum tsan_atomic_action action;
 257   enum tree_code code;
 258 } tsan_atomic_table[] =
 259 {
 260 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 261   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 262 #define CHECK_LAST(fcode, tsan_fcode) \
 263   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 264 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 265   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 266 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 267   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 268 #define WEAK_CAS(fcode, tsan_fcode) \
 269   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 270 #define STRONG_CAS(fcode, tsan_fcode) \
 271   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 272 #define BOOL_CAS(fcode, tsan_fcode) \
 273   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 274 #define VAL_CAS(fcode, tsan_fcode) \
 275   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 276 #define LOCK_RELEASE(fcode, tsan_fcode) \
 277   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 278 #define FETCH_OP(fcode, tsan_fcode, code) \
 279   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 280 #define FETCH_OPS(fcode, tsan_fcode, code) \
 281   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 282 #define BOOL_CLEAR(fcode, tsan_fcode) \
 283   TRANSFORM (fcode, tsan_fcode, bool_clear, ERROR_MARK)
 284 #define BOOL_TEST_AND_SET(fcode, tsan_fcode) \
 285   TRANSFORM (fcode, tsan_fcode, bool_test_and_set, ERROR_MARK)
 286
 287   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 288   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 289   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 290   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 291   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 292   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 293   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 294   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 295   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 296   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 297   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 298   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 299   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 300   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 301   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 302   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 303   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 304   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 305   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 306   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 307   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 308   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 309   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 310   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 311   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 312   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 313   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 314   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 315   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 316   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 317   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 318   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 319   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 320   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 321   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 322   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 323   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 324   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 325   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 326   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 327   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 328   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 329   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 330   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 331   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 332
 333   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 334   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 335
 336   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 337   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 338   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 339   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 340   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 341   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 342   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 343   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 344   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 345   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 346   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 347   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 348   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 349   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 350   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 351   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 352   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 353   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 354   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 355   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 356   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 357   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 358   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 359   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 360   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 361   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 362   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 363   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 364   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 365   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 366
 367   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 368   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 369   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 370   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 371   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 372
 373   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 374   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 375   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 376   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 377   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 378   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 379   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 380   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 381   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 382   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 383   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 384   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 385   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 386   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 387   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 388   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 389   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 390   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 391   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 392   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 393   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 394   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 395   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 396   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 397   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 398   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 399   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 400   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 401   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 402   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 403
 404   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 405
 406   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 407   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 408   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 409   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 410   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 411   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 412   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 413   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 414   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 415   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 416   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 417   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 418   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 419   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 420   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 421   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 422   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 423   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 424   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 425   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 426   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 427   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 428   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 429   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 430   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 431   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 432   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 433   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 434   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 435   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 436
 437   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 438   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 439   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 440   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 441   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 442
 443   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 444   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 445               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 446   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 447               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 448   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 449               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 450   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 451               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 452
 453   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 454             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 455   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 456             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 457   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 458             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 459   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 460             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 461   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 462             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 463
 464   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 465   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 466   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 467   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 468   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 469            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 470
 471   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 472   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 473   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 474   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 475   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE),
 476
 477   BOOL_CLEAR (ATOMIC_CLEAR, TSAN_ATOMIC8_STORE),
 478
 479   BOOL_TEST_AND_SET (ATOMIC_TEST_AND_SET, TSAN_ATOMIC8_EXCHANGE)
 480 };
 481
 482 /* Instrument an atomic builtin.  */
 483
 484 static void
 485 instrument_builtin_call (gimple_stmt_iterator *gsi)
 486 {
 487   gimple *stmt = gsi_stmt (*gsi), *g;
 488   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 489   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 490   unsigned int i, num = gimple_call_num_args (stmt), j;
 491   for (j = 0; j < 6 && j < num; j++)
 492     args[j] = gimple_call_arg (stmt, j);
 493   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 494     if (fcode != tsan_atomic_table[i].fcode)
 495       continue;
 496     else
 497       {
 498         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 499         if (decl == NULL_TREE)
 500           return;
 501         switch (tsan_atomic_table[i].action)
 502           {
 503           case check_last:
 504           case fetch_op:
 505             last_arg = gimple_call_arg (stmt, num - 1);
 506             if (tree_fits_uhwi_p (last_arg)
 507                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 508               return;
 509             gimple_call_set_fndecl (stmt, decl);
 510             update_stmt (stmt);
 511             maybe_clean_eh_stmt (stmt);
 512             if (tsan_atomic_table[i].action == fetch_op)
 513               {
 514                 args[1] = gimple_call_arg (stmt, 1);
 515                 goto adjust_result;
 516               }
 517             return;
 518           case add_seq_cst:
 519           case add_acquire:
 520           case fetch_op_seq_cst:
 521             gcc_assert (num <= 2);
 522             for (j = 0; j < num; j++)
 523               args[j] = gimple_call_arg (stmt, j);
 524             for (; j < 2; j++)
 525               args[j] = NULL_TREE;
 526             args[num] = build_int_cst (NULL_TREE,
 527                                        tsan_atomic_table[i].action
 528                                        != add_acquire
 529                                        ? MEMMODEL_SEQ_CST
 530                                        : MEMMODEL_ACQUIRE);
 531             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 532             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 533             stmt = gsi_stmt (*gsi);
 534             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 535               {
 536               adjust_result:
 537                 lhs = gimple_call_lhs (stmt);
 538                 if (lhs == NULL_TREE)
 539                   return;
 540                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 541                                                 TREE_TYPE (args[1])))
 542                   {
 543                     tree var = make_ssa_name (TREE_TYPE (lhs));
 544                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 545                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 546                     args[1] = var;
 547                   }
 548                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 549                 /* BIT_NOT_EXPR stands for NAND.  */
 550                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 551                   {
 552                     tree var = make_ssa_name (TREE_TYPE (lhs));
 553                     g = gimple_build_assign (var, BIT_AND_EXPR,
 554                                              gimple_call_lhs (stmt), args[1]);
 555                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 556                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 557                   }
 558                 else
 559                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 560                                            gimple_call_lhs (stmt), args[1]);
 561                 update_stmt (stmt);
 562                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 563               }
 564             return;
 565           case weak_cas:
 566             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 567               continue;
 568             /* FALLTHRU */
 569           case strong_cas:
 570             gcc_assert (num == 6);
 571             for (j = 0; j < 6; j++)
 572               args[j] = gimple_call_arg (stmt, j);
 573             if (tree_fits_uhwi_p (args[4])
 574                 && memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 575               return;
 576             if (tree_fits_uhwi_p (args[5])
 577                 && memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 578               return;
 579             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 580                                 args[4], args[5]);
 581             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 582             return;
 583           case bool_cas:
 584           case val_cas:
 585             gcc_assert (num == 3);
 586             for (j = 0; j < 3; j++)
 587               args[j] = gimple_call_arg (stmt, j);
 588             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 589             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 590             t = create_tmp_var (t);
 591             mark_addressable (t);
 592             if (!useless_type_conversion_p (TREE_TYPE (t),
 593                                             TREE_TYPE (args[1])))
 594               {
 595                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 596                                          NOP_EXPR, args[1]);
 597                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 598                 args[1] = gimple_assign_lhs (g);
 599               }
 600             g = gimple_build_assign (t, args[1]);
 601             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 602             lhs = gimple_call_lhs (stmt);
 603             update_gimple_call (gsi, decl, 5, args[0],
 604                                 build_fold_addr_expr (t), args[2],
 605                                 build_int_cst (NULL_TREE,
 606                                                MEMMODEL_SEQ_CST),
 607                                 build_int_cst (NULL_TREE,
 608                                                MEMMODEL_SEQ_CST));
 609             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 610             if (tsan_atomic_table[i].action == val_cas && lhs)
 611               {
 612                 tree cond;
 613                 stmt = gsi_stmt (*gsi);
 614                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 615                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 616                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 617                 cond = build2 (NE_EXPR, boolean_type_node, t,
 618                                build_int_cst (TREE_TYPE (t), 0));
 619                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 620                                          gimple_assign_lhs (g));
 621                 gimple_call_set_lhs (stmt, t);
 622                 update_stmt (stmt);
 623                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 624               }
 625             return;
 626           case lock_release:
 627             gcc_assert (num == 1);
 628             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 629             t = TREE_VALUE (TREE_CHAIN (t));
 630             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 631                                 build_int_cst (t, 0),
 632                                 build_int_cst (NULL_TREE,
 633                                                MEMMODEL_RELEASE));
 634             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 635             return;
 636           case bool_clear:
 637           case bool_test_and_set:
 638             if (BOOL_TYPE_SIZE != 8)
 639               {
 640                 decl = NULL_TREE;
 641                 for (j = 1; j < 5; j++)
 642                   if (BOOL_TYPE_SIZE == (8 << j))
 643                     {
 644                       enum built_in_function tsan_fcode
 645                         = (enum built_in_function)
 646                           (tsan_atomic_table[i].tsan_fcode + j);
 647                       decl = builtin_decl_implicit (tsan_fcode);
 648                       break;
 649                     }
 650                 if (decl == NULL_TREE)
 651                   return;
 652               }
 653             last_arg = gimple_call_arg (stmt, num - 1);
 654             if (tree_fits_uhwi_p (last_arg)
 655                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 656               return;
 657             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 658             t = TREE_VALUE (TREE_CHAIN (t));
 659             if (tsan_atomic_table[i].action == bool_clear)
 660               {
 661                 update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 662                                     build_int_cst (t, 0), last_arg);
 663                 maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 664                 return;
 665               }
 666             t = build_int_cst (t, targetm.atomic_test_and_set_trueval);
 667             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 668                                 t, last_arg);
 669             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 670             stmt = gsi_stmt (*gsi);
 671             lhs = gimple_call_lhs (stmt);
 672             if (lhs == NULL_TREE)
 673               return;
 674             if (targetm.atomic_test_and_set_trueval != 1
 675                 || !useless_type_conversion_p (TREE_TYPE (lhs),
 676                                                TREE_TYPE (t)))
 677               {
 678                 tree new_lhs = make_ssa_name (TREE_TYPE (t));
 679                 gimple_call_set_lhs (stmt, new_lhs);
 680                 if (targetm.atomic_test_and_set_trueval != 1)
 681                   g = gimple_build_assign (lhs, NE_EXPR, new_lhs,
 682                                            build_int_cst (TREE_TYPE (t), 0));
 683                 else
 684                   g = gimple_build_assign (lhs, NOP_EXPR, new_lhs);
 685                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 686                 update_stmt (stmt);
 687               }
 688             return;
 689           default:
 690             continue;
 691           }
 692       }
 693 }
 694
 695 /* Instruments the gimple pointed to by GSI. Return
 696    true if func entry/exit should be instrumented.  */
 697
 698 static bool
 699 instrument_gimple (gimple_stmt_iterator *gsi)
 700 {
 701   gimple *stmt;
 702   tree rhs, lhs;
 703   bool instrumented = false;
 704
 705   stmt = gsi_stmt (*gsi);
 706   if (is_gimple_call (stmt)
 707       && (gimple_call_fndecl (stmt)
 708           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 709     {
 710       /* All functions with function call will have exit instrumented,
 711          therefore no function calls other than __tsan_func_exit
 712          shall appear in the functions.  */
 713       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 714       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 715         instrument_builtin_call (gsi);
 716       return true;
 717     }
 718   else if (is_gimple_assign (stmt)
 719            && !gimple_clobber_p (stmt))
 720     {
 721       if (gimple_store_p (stmt))
 722         {
 723           lhs = gimple_assign_lhs (stmt);
 724           instrumented = instrument_expr (*gsi, lhs, true);
 725         }
 726       if (gimple_assign_load_p (stmt))
 727         {
 728           rhs = gimple_assign_rhs1 (stmt);
 729           instrumented = instrument_expr (*gsi, rhs, false);
 730         }
 731     }
 732   return instrumented;
 733 }
 734
 735 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 736
 737 static void
 738 replace_func_exit (gimple *stmt)
 739 {
 740   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 741   gimple *g = gimple_build_call (builtin_decl, 0);
 742   gimple_set_location (g, cfun->function_end_locus);
 743   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 744   gsi_replace (&gsi, g, true);
 745 }
 746
 747 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 748
 749 static void
 750 instrument_func_exit (void)
 751 {
 752   location_t loc;
 753   basic_block exit_bb;
 754   gimple_stmt_iterator gsi;
 755   gimple *stmt, *g;
 756   tree builtin_decl;
 757   edge e;
 758   edge_iterator ei;
 759
 760   /* Find all function exits.  */
 761   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 762   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 763     {
 764       gsi = gsi_last_bb (e->src);
 765       stmt = gsi_stmt (gsi);
 766       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 767                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 768       loc = gimple_location (stmt);
 769       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 770       g = gimple_build_call (builtin_decl, 0);
 771       gimple_set_location (g, loc);
 772       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 773     }
 774 }
 775
 776 /* Instruments all interesting memory accesses in the current function.
 777    Return true if func entry/exit should be instrumented.  */
 778
 779 static bool
 780 instrument_memory_accesses (bool *cfg_changed)
 781 {
 782   basic_block bb;
 783   gimple_stmt_iterator gsi;
 784   bool fentry_exit_instrument = false;
 785   bool func_exit_seen = false;
 786   auto_vec<gimple *> tsan_func_exits;
 787
 788   FOR_EACH_BB_FN (bb, cfun)
 789     {
 790       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 791         {
 792           gimple *stmt = gsi_stmt (gsi);
 793           if (gimple_call_internal_p (stmt, IFN_TSAN_FUNC_EXIT))
 794             {
 795               if (fentry_exit_instrument)
 796                 replace_func_exit (stmt);
 797               else
 798                 tsan_func_exits.safe_push (stmt);
 799               func_exit_seen = true;
 800             }
 801           else
 802             fentry_exit_instrument |= instrument_gimple (&gsi);
 803         }
 804       if (gimple_purge_dead_eh_edges (bb))
 805         *cfg_changed = true;
 806     }
 807   unsigned int i;
 808   gimple *stmt;
 809   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 810     if (fentry_exit_instrument)
 811       replace_func_exit (stmt);
 812     else
 813       {
 814         gsi = gsi_for_stmt (stmt);
 815         gsi_remove (&gsi, true);
 816       }
 817   if (fentry_exit_instrument && !func_exit_seen)
 818     instrument_func_exit ();
 819   return fentry_exit_instrument;
 820 }
 821
 822 /* Instruments function entry.  */
 823
 824 static void
 825 instrument_func_entry (void)
 826 {
 827   tree ret_addr, builtin_decl;
 828   gimple *g;
 829   gimple_seq seq = NULL;
 830
 831   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 832   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 833   ret_addr = make_ssa_name (ptr_type_node);
 834   gimple_call_set_lhs (g, ret_addr);
 835   gimple_set_location (g, cfun->function_start_locus);
 836   gimple_seq_add_stmt_without_update (&seq, g);
 837
 838   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 839   g = gimple_build_call (builtin_decl, 1, ret_addr);
 840   gimple_set_location (g, cfun->function_start_locus);
 841   gimple_seq_add_stmt_without_update (&seq, g);
 842
 843   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 844   gsi_insert_seq_on_edge_immediate (e, seq);
 845 }
 846
 847 /* ThreadSanitizer instrumentation pass.  */
 848
 849 static unsigned
 850 tsan_pass (void)
 851 {
 852   initialize_sanitizer_builtins ();
 853   bool cfg_changed = false;
 854   if (instrument_memory_accesses (&cfg_changed))
 855     instrument_func_entry ();
 856   return cfg_changed ? TODO_cleanup_cfg : 0;
 857 }
 858
 859 /* Inserts __tsan_init () into the list of CTORs.  */
 860
 861 void
 862 tsan_finish_file (void)
 863 {
 864   tree ctor_statements = NULL_TREE;
 865
 866   initialize_sanitizer_builtins ();
 867   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 868   append_to_statement_list (build_call_expr (init_decl, 0),
 869                             &ctor_statements);
 870   cgraph_build_static_cdtor ('I', ctor_statements,
 871                              MAX_RESERVED_INIT_PRIORITY - 1);
 872 }
 873
 874 /* The pass descriptor.  */
 875
 876 namespace {
 877
 878 const pass_data pass_data_tsan =
 879 {
 880   GIMPLE_PASS, /* type */
 881   "tsan", /* name */
 882   OPTGROUP_NONE, /* optinfo_flags */
 883   TV_NONE, /* tv_id */
 884   ( PROP_ssa | PROP_cfg ), /* properties_required */
 885   0, /* properties_provided */
 886   0, /* properties_destroyed */
 887   0, /* todo_flags_start */
 888   TODO_update_ssa, /* todo_flags_finish */
 889 };
 890
 891 class pass_tsan : public gimple_opt_pass
 892 {
 893 public:
 894   pass_tsan (gcc::context *ctxt)
 895     : gimple_opt_pass (pass_data_tsan, ctxt)
 896   {}
 897
 898   /* opt_pass methods: */
 899   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 900   virtual bool gate (function *)
 901 {
 902   return sanitize_flags_p (SANITIZE_THREAD);
 903 }
 904
 905   virtual unsigned int execute (function *) { return tsan_pass (); }
 906
 907 }; // class pass_tsan
 908
 909 } // anon namespace
 910
 911 gimple_opt_pass *
 912 make_pass_tsan (gcc::context *ctxt)
 913 {
 914   return new pass_tsan (ctxt);
 915 }
 916
 917 namespace {
 918
 919 const pass_data pass_data_tsan_O0 =
 920 {
 921   GIMPLE_PASS, /* type */
 922   "tsan0", /* name */
 923   OPTGROUP_NONE, /* optinfo_flags */
 924   TV_NONE, /* tv_id */
 925   ( PROP_ssa | PROP_cfg ), /* properties_required */
 926   0, /* properties_provided */
 927   0, /* properties_destroyed */
 928   0, /* todo_flags_start */
 929   TODO_update_ssa, /* todo_flags_finish */
 930 };
 931
 932 class pass_tsan_O0 : public gimple_opt_pass
 933 {
 934 public:
 935   pass_tsan_O0 (gcc::context *ctxt)
 936     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 937   {}
 938
 939   /* opt_pass methods: */
 940   virtual bool gate (function *)
 941     {
 942       return (sanitize_flags_p (SANITIZE_THREAD) && !optimize);
 943     }
 944
 945   virtual unsigned int execute (function *) { return tsan_pass (); }
 946
 947 }; // class pass_tsan_O0
 948
 949 } // anon namespace
 950
 951 gimple_opt_pass *
 952 make_pass_tsan_O0 (gcc::context *ctxt)
 953 {
 954   return new pass_tsan_O0 (ctxt);
 955 }