gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2016 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 "gimple.h"
  29 #include "tree-pass.h"
  30 #include "ssa.h"
  31 #include "cgraph.h"
  32 #include "fold-const.h"
  33 #include "gimplify.h"
  34 #include "gimple-iterator.h"
  35 #include "gimplify-me.h"
  36 #include "tree-cfg.h"
  37 #include "tree-iterator.h"
  38 #include "tree-ssa-propagate.h"
  39 #include "tree-ssa-loop-ivopts.h"
  40 #include "tsan.h"
  41 #include "asan.h"
  42 #include "builtins.h"
  43 #include "target.h"
  44
  45 /* Number of instrumented memory accesses in the current function.  */
  46
  47 /* Builds the following decl
  48    void __tsan_read/writeX (void *addr);  */
  49
  50 static tree
  51 get_memory_access_decl (bool is_write, unsigned size)
  52 {
  53   enum built_in_function fcode;
  54
  55   if (size <= 1)
  56     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  57                      : BUILT_IN_TSAN_READ1;
  58   else if (size <= 3)
  59     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  60                      : BUILT_IN_TSAN_READ2;
  61   else if (size <= 7)
  62     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  63                      : BUILT_IN_TSAN_READ4;
  64   else if (size <= 15)
  65     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  66                      : BUILT_IN_TSAN_READ8;
  67   else
  68     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  69                      : BUILT_IN_TSAN_READ16;
  70
  71   return builtin_decl_implicit (fcode);
  72 }
  73
  74 /* Check as to whether EXPR refers to a store to vptr.  */
  75
  76 static tree
  77 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  78 {
  79   if (is_write == true
  80       && gimple_assign_single_p (stmt)
  81       && TREE_CODE (expr) == COMPONENT_REF)
  82     {
  83       tree field = TREE_OPERAND (expr, 1);
  84       if (TREE_CODE (field) == FIELD_DECL
  85           && DECL_VIRTUAL_P (field))
  86         return gimple_assign_rhs1 (stmt);
  87     }
  88   return NULL;
  89 }
  90
  91 /* Instruments EXPR if needed. If any instrumentation is inserted,
  92    return true.  */
  93
  94 static bool
  95 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
  96 {
  97   tree base, rhs, expr_ptr, builtin_decl;
  98   basic_block bb;
  99   HOST_WIDE_INT size;
 100   gimple *stmt, *g;
 101   gimple_seq seq;
 102   location_t loc;
 103   unsigned int align;
 104
 105   size = int_size_in_bytes (TREE_TYPE (expr));
 106   if (size <= 0)
 107     return false;
 108
 109   HOST_WIDE_INT bitsize, bitpos;
 110   tree offset;
 111   machine_mode mode;
 112   int unsignedp, reversep, volatilep = 0;
 113   base = get_inner_reference (expr, &bitsize, &bitpos, &offset, &mode,
 114                               &unsignedp, &reversep, &volatilep, false);
 115
 116   /* No need to instrument accesses to decls that don't escape,
 117      they can't escape to other threads then.  */
 118   if (DECL_P (base) && !is_global_var (base))
 119     {
 120       struct pt_solution pt;
 121       memset (&pt, 0, sizeof (pt));
 122       pt.escaped = 1;
 123       pt.ipa_escaped = flag_ipa_pta != 0;
 124       if (!pt_solution_includes (&pt, base))
 125         return false;
 126       if (!may_be_aliased (base))
 127         return false;
 128     }
 129
 130   if (TREE_READONLY (base)
 131       || (TREE_CODE (base) == VAR_DECL
 132           && DECL_HARD_REGISTER (base)))
 133     return false;
 134
 135   stmt = gsi_stmt (gsi);
 136   loc = gimple_location (stmt);
 137   rhs = is_vptr_store (stmt, expr, is_write);
 138
 139   if ((TREE_CODE (expr) == COMPONENT_REF
 140        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 141       || TREE_CODE (expr) == BIT_FIELD_REF)
 142     {
 143       base = TREE_OPERAND (expr, 0);
 144       if (TREE_CODE (expr) == COMPONENT_REF)
 145         {
 146           expr = TREE_OPERAND (expr, 1);
 147           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 148             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 149           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 150               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 151               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 152             return false;
 153           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 154                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 155           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 156         }
 157       else
 158         {
 159           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 160               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 161             return false;
 162           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 163           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 164         }
 165       if (bitpos < 0 || bitsize <= 0)
 166         return false;
 167       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 168              / BITS_PER_UNIT;
 169       if (may_be_nonaddressable_p (base))
 170         return false;
 171       align = get_object_alignment (base);
 172       if (align < BITS_PER_UNIT)
 173         return false;
 174       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 175       if ((align - 1) & bitpos)
 176         {
 177           align = (align - 1) & bitpos;
 178           align = align & -align;
 179         }
 180       expr = build_fold_addr_expr (unshare_expr (base));
 181       expr = build2 (MEM_REF, char_type_node, expr,
 182                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 183       expr_ptr = build_fold_addr_expr (expr);
 184     }
 185   else
 186     {
 187       if (may_be_nonaddressable_p (expr))
 188         return false;
 189       align = get_object_alignment (expr);
 190       if (align < BITS_PER_UNIT)
 191         return false;
 192       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 193     }
 194   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 195   if ((size & (size - 1)) != 0 || size > 16
 196       || align < MIN (size, 8) * BITS_PER_UNIT)
 197     {
 198       builtin_decl = builtin_decl_implicit (is_write
 199                                             ? BUILT_IN_TSAN_WRITE_RANGE
 200                                             : BUILT_IN_TSAN_READ_RANGE);
 201       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 202     }
 203   else if (rhs == NULL)
 204     g = gimple_build_call (get_memory_access_decl (is_write, size),
 205                            1, expr_ptr);
 206   else
 207     {
 208       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 209       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 210     }
 211   gimple_set_location (g, loc);
 212   gimple_seq_add_stmt_without_update (&seq, g);
 213   /* Instrumentation for assignment of a function result
 214      must be inserted after the call.  Instrumentation for
 215      reads of function arguments must be inserted before the call.
 216      That's because the call can contain synchronization.  */
 217   if (is_gimple_call (stmt) && is_write)
 218     {
 219       /* If the call can throw, it must be the last stmt in
 220          a basic block, so the instrumented stmts need to be
 221          inserted in successor bbs.  */
 222       if (is_ctrl_altering_stmt (stmt))
 223         {
 224           edge e;
 225
 226           bb = gsi_bb (gsi);
 227           e = find_fallthru_edge (bb->succs);
 228           if (e)
 229             gsi_insert_seq_on_edge_immediate (e, seq);
 230         }
 231       else
 232         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 233     }
 234   else
 235     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 236
 237   return true;
 238 }
 239
 240 /* Actions for sync/atomic builtin transformations.  */
 241 enum tsan_atomic_action
 242 {
 243   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 244   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst,
 245   bool_clear, bool_test_and_set
 246 };
 247
 248 /* Table how to map sync/atomic builtins to their corresponding
 249    tsan equivalents.  */
 250 static const struct tsan_map_atomic
 251 {
 252   enum built_in_function fcode, tsan_fcode;
 253   enum tsan_atomic_action action;
 254   enum tree_code code;
 255 } tsan_atomic_table[] =
 256 {
 257 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 258   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 259 #define CHECK_LAST(fcode, tsan_fcode) \
 260   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 261 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 262   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 263 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 264   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 265 #define WEAK_CAS(fcode, tsan_fcode) \
 266   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 267 #define STRONG_CAS(fcode, tsan_fcode) \
 268   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 269 #define BOOL_CAS(fcode, tsan_fcode) \
 270   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 271 #define VAL_CAS(fcode, tsan_fcode) \
 272   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 273 #define LOCK_RELEASE(fcode, tsan_fcode) \
 274   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 275 #define FETCH_OP(fcode, tsan_fcode, code) \
 276   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 277 #define FETCH_OPS(fcode, tsan_fcode, code) \
 278   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 279 #define BOOL_CLEAR(fcode, tsan_fcode) \
 280   TRANSFORM (fcode, tsan_fcode, bool_clear, ERROR_MARK)
 281 #define BOOL_TEST_AND_SET(fcode, tsan_fcode) \
 282   TRANSFORM (fcode, tsan_fcode, bool_test_and_set, ERROR_MARK)
 283
 284   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 285   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 286   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 287   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 288   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 289   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 290   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 291   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 292   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 293   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 294   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 295   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 296   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 297   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 298   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 299   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 300   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 301   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 302   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 303   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 304   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 305   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 306   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 307   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 308   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 309   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 310   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 311   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 312   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 313   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 314   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 315   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 316   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 317   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 318   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 319   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 320   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 321   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 322   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 323   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 324   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 325   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 326   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 327   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 328   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 329
 330   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 331   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 332
 333   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 334   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 335   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 336   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 337   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 338   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 339   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 340   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 341   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 342   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 343   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 344   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 345   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 346   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 347   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 348   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 349   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 350   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 351   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 352   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 353   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 354   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 355   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 356   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 357   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 358   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 359   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 360   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 361   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 362   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 363
 364   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 365   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 366   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 367   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 368   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 369
 370   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 371   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 372   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 373   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 374   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 375   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 376   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 377   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 378   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 379   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 380   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 381   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 382   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 383   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 384   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 385   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 386   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 387   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 388   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 389   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 390   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 391   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 392   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 393   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 394   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 395   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 396   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 397   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 398   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 399   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 400
 401   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 402
 403   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 404   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 405   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 406   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 407   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 408   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 409   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 410   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 411   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 412   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 413   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 414   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 415   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 416   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 417   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 418   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 419   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 420   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 421   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 422   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 423   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 424   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 425   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 426   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 427   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 428   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 429   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 430   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 431   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 432   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 433
 434   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 435   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 436   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 437   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 438   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 439
 440   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 441   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 442               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 443   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 444               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 445   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 446               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 447   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 448               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 449
 450   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 451             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 452   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 453             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 454   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 455             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 456   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 457             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 458   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 459             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 460
 461   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 462   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 463   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 464   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 465   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 466            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 467
 468   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 469   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 470   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 471   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 472   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE),
 473
 474   BOOL_CLEAR (ATOMIC_CLEAR, TSAN_ATOMIC8_STORE),
 475
 476   BOOL_TEST_AND_SET (ATOMIC_TEST_AND_SET, TSAN_ATOMIC8_EXCHANGE)
 477 };
 478
 479 /* Instrument an atomic builtin.  */
 480
 481 static void
 482 instrument_builtin_call (gimple_stmt_iterator *gsi)
 483 {
 484   gimple *stmt = gsi_stmt (*gsi), *g;
 485   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 486   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 487   unsigned int i, num = gimple_call_num_args (stmt), j;
 488   for (j = 0; j < 6 && j < num; j++)
 489     args[j] = gimple_call_arg (stmt, j);
 490   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 491     if (fcode != tsan_atomic_table[i].fcode)
 492       continue;
 493     else
 494       {
 495         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 496         if (decl == NULL_TREE)
 497           return;
 498         switch (tsan_atomic_table[i].action)
 499           {
 500           case check_last:
 501           case fetch_op:
 502             last_arg = gimple_call_arg (stmt, num - 1);
 503             if (!tree_fits_uhwi_p (last_arg)
 504                 || memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 505               return;
 506             gimple_call_set_fndecl (stmt, decl);
 507             update_stmt (stmt);
 508             if (tsan_atomic_table[i].action == fetch_op)
 509               {
 510                 args[1] = gimple_call_arg (stmt, 1);
 511                 goto adjust_result;
 512               }
 513             return;
 514           case add_seq_cst:
 515           case add_acquire:
 516           case fetch_op_seq_cst:
 517             gcc_assert (num <= 2);
 518             for (j = 0; j < num; j++)
 519               args[j] = gimple_call_arg (stmt, j);
 520             for (; j < 2; j++)
 521               args[j] = NULL_TREE;
 522             args[num] = build_int_cst (NULL_TREE,
 523                                        tsan_atomic_table[i].action
 524                                        != add_acquire
 525                                        ? MEMMODEL_SEQ_CST
 526                                        : MEMMODEL_ACQUIRE);
 527             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 528             stmt = gsi_stmt (*gsi);
 529             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 530               {
 531               adjust_result:
 532                 lhs = gimple_call_lhs (stmt);
 533                 if (lhs == NULL_TREE)
 534                   return;
 535                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 536                                                 TREE_TYPE (args[1])))
 537                   {
 538                     tree var = make_ssa_name (TREE_TYPE (lhs));
 539                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 540                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 541                     args[1] = var;
 542                   }
 543                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 544                 /* BIT_NOT_EXPR stands for NAND.  */
 545                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 546                   {
 547                     tree var = make_ssa_name (TREE_TYPE (lhs));
 548                     g = gimple_build_assign (var, BIT_AND_EXPR,
 549                                              gimple_call_lhs (stmt), args[1]);
 550                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 551                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 552                   }
 553                 else
 554                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 555                                            gimple_call_lhs (stmt), args[1]);
 556                 update_stmt (stmt);
 557                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 558               }
 559             return;
 560           case weak_cas:
 561             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 562               continue;
 563             /* FALLTHRU */
 564           case strong_cas:
 565             gcc_assert (num == 6);
 566             for (j = 0; j < 6; j++)
 567               args[j] = gimple_call_arg (stmt, j);
 568             if (!tree_fits_uhwi_p (args[4])
 569                 || memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 570               return;
 571             if (!tree_fits_uhwi_p (args[5])
 572                 || memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 573               return;
 574             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 575                                 args[4], args[5]);
 576             return;
 577           case bool_cas:
 578           case val_cas:
 579             gcc_assert (num == 3);
 580             for (j = 0; j < 3; j++)
 581               args[j] = gimple_call_arg (stmt, j);
 582             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 583             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 584             t = create_tmp_var (t);
 585             mark_addressable (t);
 586             if (!useless_type_conversion_p (TREE_TYPE (t),
 587                                             TREE_TYPE (args[1])))
 588               {
 589                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 590                                          NOP_EXPR, args[1]);
 591                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 592                 args[1] = gimple_assign_lhs (g);
 593               }
 594             g = gimple_build_assign (t, args[1]);
 595             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 596             lhs = gimple_call_lhs (stmt);
 597             update_gimple_call (gsi, decl, 5, args[0],
 598                                 build_fold_addr_expr (t), args[2],
 599                                 build_int_cst (NULL_TREE,
 600                                                MEMMODEL_SEQ_CST),
 601                                 build_int_cst (NULL_TREE,
 602                                                MEMMODEL_SEQ_CST));
 603             if (tsan_atomic_table[i].action == val_cas && lhs)
 604               {
 605                 tree cond;
 606                 stmt = gsi_stmt (*gsi);
 607                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 608                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 609                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 610                 cond = build2 (NE_EXPR, boolean_type_node, t,
 611                                build_int_cst (TREE_TYPE (t), 0));
 612                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 613                                          gimple_assign_lhs (g));
 614                 gimple_call_set_lhs (stmt, t);
 615                 update_stmt (stmt);
 616                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 617               }
 618             return;
 619           case lock_release:
 620             gcc_assert (num == 1);
 621             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 622             t = TREE_VALUE (TREE_CHAIN (t));
 623             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 624                                 build_int_cst (t, 0),
 625                                 build_int_cst (NULL_TREE,
 626                                                MEMMODEL_RELEASE));
 627             return;
 628           case bool_clear:
 629           case bool_test_and_set:
 630             if (BOOL_TYPE_SIZE != 8)
 631               {
 632                 decl = NULL_TREE;
 633                 for (j = 1; j < 5; j++)
 634                   if (BOOL_TYPE_SIZE == (8 << j))
 635                     {
 636                       enum built_in_function tsan_fcode
 637                         = (enum built_in_function)
 638                           (tsan_atomic_table[i].tsan_fcode + j);
 639                       decl = builtin_decl_implicit (tsan_fcode);
 640                       break;
 641                     }
 642                 if (decl == NULL_TREE)
 643                   return;
 644               }
 645             last_arg = gimple_call_arg (stmt, num - 1);
 646             if (!tree_fits_uhwi_p (last_arg)
 647                 || memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 648               return;
 649             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 650             t = TREE_VALUE (TREE_CHAIN (t));
 651             if (tsan_atomic_table[i].action == bool_clear)
 652               {
 653                 update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 654                                     build_int_cst (t, 0), last_arg);
 655                 return;
 656               }
 657             t = build_int_cst (t, targetm.atomic_test_and_set_trueval);
 658             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 659                                 t, last_arg);
 660             stmt = gsi_stmt (*gsi);
 661             lhs = gimple_call_lhs (stmt);
 662             if (lhs == NULL_TREE)
 663               return;
 664             if (targetm.atomic_test_and_set_trueval != 1
 665                 || !useless_type_conversion_p (TREE_TYPE (lhs),
 666                                                TREE_TYPE (t)))
 667               {
 668                 tree new_lhs = make_ssa_name (TREE_TYPE (t));
 669                 gimple_call_set_lhs (stmt, new_lhs);
 670                 if (targetm.atomic_test_and_set_trueval != 1)
 671                   g = gimple_build_assign (lhs, NE_EXPR, new_lhs,
 672                                            build_int_cst (TREE_TYPE (t), 0));
 673                 else
 674                   g = gimple_build_assign (lhs, NOP_EXPR, new_lhs);
 675                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 676                 update_stmt (stmt);
 677               }
 678             return;
 679           default:
 680             continue;
 681           }
 682       }
 683 }
 684
 685 /* Instruments the gimple pointed to by GSI. Return
 686    true if func entry/exit should be instrumented.  */
 687
 688 static bool
 689 instrument_gimple (gimple_stmt_iterator *gsi)
 690 {
 691   gimple *stmt;
 692   tree rhs, lhs;
 693   bool instrumented = false;
 694
 695   stmt = gsi_stmt (*gsi);
 696   if (is_gimple_call (stmt)
 697       && (gimple_call_fndecl (stmt)
 698           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 699     {
 700       /* All functions with function call will have exit instrumented,
 701          therefore no function calls other than __tsan_func_exit
 702          shall appear in the functions.  */
 703       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 704       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 705         instrument_builtin_call (gsi);
 706       return true;
 707     }
 708   else if (is_gimple_assign (stmt)
 709            && !gimple_clobber_p (stmt))
 710     {
 711       if (gimple_store_p (stmt))
 712         {
 713           lhs = gimple_assign_lhs (stmt);
 714           instrumented = instrument_expr (*gsi, lhs, true);
 715         }
 716       if (gimple_assign_load_p (stmt))
 717         {
 718           rhs = gimple_assign_rhs1 (stmt);
 719           instrumented = instrument_expr (*gsi, rhs, false);
 720         }
 721     }
 722   return instrumented;
 723 }
 724
 725 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 726
 727 static void
 728 replace_func_exit (gimple *stmt)
 729 {
 730   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 731   gimple *g = gimple_build_call (builtin_decl, 0);
 732   gimple_set_location (g, cfun->function_end_locus);
 733   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 734   gsi_replace (&gsi, g, true);
 735 }
 736
 737 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 738
 739 static void
 740 instrument_func_exit (void)
 741 {
 742   location_t loc;
 743   basic_block exit_bb;
 744   gimple_stmt_iterator gsi;
 745   gimple *stmt, *g;
 746   tree builtin_decl;
 747   edge e;
 748   edge_iterator ei;
 749
 750   /* Find all function exits.  */
 751   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 752   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 753     {
 754       gsi = gsi_last_bb (e->src);
 755       stmt = gsi_stmt (gsi);
 756       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 757                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 758       loc = gimple_location (stmt);
 759       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 760       g = gimple_build_call (builtin_decl, 0);
 761       gimple_set_location (g, loc);
 762       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 763     }
 764 }
 765
 766 /* Instruments all interesting memory accesses in the current function.
 767    Return true if func entry/exit should be instrumented.  */
 768
 769 static bool
 770 instrument_memory_accesses (void)
 771 {
 772   basic_block bb;
 773   gimple_stmt_iterator gsi;
 774   bool fentry_exit_instrument = false;
 775   bool func_exit_seen = false;
 776   auto_vec<gimple *> tsan_func_exits;
 777
 778   FOR_EACH_BB_FN (bb, cfun)
 779     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 780       {
 781         gimple *stmt = gsi_stmt (gsi);
 782         if (is_gimple_call (stmt)
 783             && gimple_call_internal_p (stmt)
 784             && gimple_call_internal_fn (stmt) == IFN_TSAN_FUNC_EXIT)
 785           {
 786             if (fentry_exit_instrument)
 787               replace_func_exit (stmt);
 788             else
 789               tsan_func_exits.safe_push (stmt);
 790             func_exit_seen = true;
 791           }
 792         else
 793           fentry_exit_instrument |= instrument_gimple (&gsi);
 794       }
 795   unsigned int i;
 796   gimple *stmt;
 797   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 798     if (fentry_exit_instrument)
 799       replace_func_exit (stmt);
 800     else
 801       {
 802         gsi = gsi_for_stmt (stmt);
 803         gsi_remove (&gsi, true);
 804       }
 805   if (fentry_exit_instrument && !func_exit_seen)
 806     instrument_func_exit ();
 807   return fentry_exit_instrument;
 808 }
 809
 810 /* Instruments function entry.  */
 811
 812 static void
 813 instrument_func_entry (void)
 814 {
 815   tree ret_addr, builtin_decl;
 816   gimple *g;
 817   gimple_seq seq = NULL;
 818
 819   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 820   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 821   ret_addr = make_ssa_name (ptr_type_node);
 822   gimple_call_set_lhs (g, ret_addr);
 823   gimple_set_location (g, cfun->function_start_locus);
 824   gimple_seq_add_stmt_without_update (&seq, g);
 825
 826   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 827   g = gimple_build_call (builtin_decl, 1, ret_addr);
 828   gimple_set_location (g, cfun->function_start_locus);
 829   gimple_seq_add_stmt_without_update (&seq, g);
 830
 831   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 832   gsi_insert_seq_on_edge_immediate (e, seq);
 833 }
 834
 835 /* ThreadSanitizer instrumentation pass.  */
 836
 837 static unsigned
 838 tsan_pass (void)
 839 {
 840   initialize_sanitizer_builtins ();
 841   if (instrument_memory_accesses ())
 842     instrument_func_entry ();
 843   return 0;
 844 }
 845
 846 /* Inserts __tsan_init () into the list of CTORs.  */
 847
 848 void
 849 tsan_finish_file (void)
 850 {
 851   tree ctor_statements = NULL_TREE;
 852
 853   initialize_sanitizer_builtins ();
 854   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 855   append_to_statement_list (build_call_expr (init_decl, 0),
 856                             &ctor_statements);
 857   cgraph_build_static_cdtor ('I', ctor_statements,
 858                              MAX_RESERVED_INIT_PRIORITY - 1);
 859 }
 860
 861 /* The pass descriptor.  */
 862
 863 namespace {
 864
 865 const pass_data pass_data_tsan =
 866 {
 867   GIMPLE_PASS, /* type */
 868   "tsan", /* name */
 869   OPTGROUP_NONE, /* optinfo_flags */
 870   TV_NONE, /* tv_id */
 871   ( PROP_ssa | PROP_cfg ), /* properties_required */
 872   0, /* properties_provided */
 873   0, /* properties_destroyed */
 874   0, /* todo_flags_start */
 875   TODO_update_ssa, /* todo_flags_finish */
 876 };
 877
 878 class pass_tsan : public gimple_opt_pass
 879 {
 880 public:
 881   pass_tsan (gcc::context *ctxt)
 882     : gimple_opt_pass (pass_data_tsan, ctxt)
 883   {}
 884
 885   /* opt_pass methods: */
 886   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 887   virtual bool gate (function *)
 888 {
 889   return ((flag_sanitize & SANITIZE_THREAD) != 0
 890           && !lookup_attribute ("no_sanitize_thread",
 891                                 DECL_ATTRIBUTES (current_function_decl)));
 892 }
 893
 894   virtual unsigned int execute (function *) { return tsan_pass (); }
 895
 896 }; // class pass_tsan
 897
 898 } // anon namespace
 899
 900 gimple_opt_pass *
 901 make_pass_tsan (gcc::context *ctxt)
 902 {
 903   return new pass_tsan (ctxt);
 904 }
 905
 906 namespace {
 907
 908 const pass_data pass_data_tsan_O0 =
 909 {
 910   GIMPLE_PASS, /* type */
 911   "tsan0", /* name */
 912   OPTGROUP_NONE, /* optinfo_flags */
 913   TV_NONE, /* tv_id */
 914   ( PROP_ssa | PROP_cfg ), /* properties_required */
 915   0, /* properties_provided */
 916   0, /* properties_destroyed */
 917   0, /* todo_flags_start */
 918   TODO_update_ssa, /* todo_flags_finish */
 919 };
 920
 921 class pass_tsan_O0 : public gimple_opt_pass
 922 {
 923 public:
 924   pass_tsan_O0 (gcc::context *ctxt)
 925     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 926   {}
 927
 928   /* opt_pass methods: */
 929   virtual bool gate (function *)
 930     {
 931       return ((flag_sanitize & SANITIZE_THREAD) != 0 && !optimize
 932               && !lookup_attribute ("no_sanitize_thread",
 933                                     DECL_ATTRIBUTES (current_function_decl)));
 934     }
 935
 936   virtual unsigned int execute (function *) { return tsan_pass (); }
 937
 938 }; // class pass_tsan_O0
 939
 940 } // anon namespace
 941
 942 gimple_opt_pass *
 943 make_pass_tsan_O0 (gcc::context *ctxt)
 944 {
 945   return new pass_tsan_O0 (ctxt);
 946 }