gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2015 Free Software Foundation, Inc.
   3    Contributed by Dmitry Vyukov <dvyukov@google.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "alias.h"
  26 #include "backend.h"
  27 #include "tree.h"
  28 #include "gimple.h"
  29 #include "rtl.h"
  30 #include "ssa.h"
  31 #include "options.h"
  32 #include "fold-const.h"
  33 #include "flags.h"
  34 #include "insn-config.h"
  35 #include "expmed.h"
  36 #include "dojump.h"
  37 #include "explow.h"
  38 #include "calls.h"
  39 #include "emit-rtl.h"
  40 #include "varasm.h"
  41 #include "stmt.h"
  42 #include "expr.h"
  43 #include "intl.h"
  44 #include "internal-fn.h"
  45 #include "gimplify.h"
  46 #include "gimple-iterator.h"
  47 #include "gimplify-me.h"
  48 #include "cgraph.h"
  49 #include "tree-cfg.h"
  50 #include "tree-pass.h"
  51 #include "tree-iterator.h"
  52 #include "langhooks.h"
  53 #include "output.h"
  54 #include "target.h"
  55 #include "diagnostic.h"
  56 #include "tree-ssa-propagate.h"
  57 #include "tree-ssa-loop-ivopts.h"
  58 #include "tsan.h"
  59 #include "asan.h"
  60 #include "builtins.h"
  61
  62 /* Number of instrumented memory accesses in the current function.  */
  63
  64 /* Builds the following decl
  65    void __tsan_read/writeX (void *addr);  */
  66
  67 static tree
  68 get_memory_access_decl (bool is_write, unsigned size)
  69 {
  70   enum built_in_function fcode;
  71
  72   if (size <= 1)
  73     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  74                      : BUILT_IN_TSAN_READ1;
  75   else if (size <= 3)
  76     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  77                      : BUILT_IN_TSAN_READ2;
  78   else if (size <= 7)
  79     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  80                      : BUILT_IN_TSAN_READ4;
  81   else if (size <= 15)
  82     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  83                      : BUILT_IN_TSAN_READ8;
  84   else
  85     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  86                      : BUILT_IN_TSAN_READ16;
  87
  88   return builtin_decl_implicit (fcode);
  89 }
  90
  91 /* Check as to whether EXPR refers to a store to vptr.  */
  92
  93 static tree
  94 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  95 {
  96   if (is_write == true
  97       && gimple_assign_single_p (stmt)
  98       && TREE_CODE (expr) == COMPONENT_REF)
  99     {
 100       tree field = TREE_OPERAND (expr, 1);
 101       if (TREE_CODE (field) == FIELD_DECL
 102           && DECL_VIRTUAL_P (field))
 103         return gimple_assign_rhs1 (stmt);
 104     }
 105   return NULL;
 106 }
 107
 108 /* Instruments EXPR if needed. If any instrumentation is inserted,
 109    return true.  */
 110
 111 static bool
 112 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 113 {
 114   tree base, rhs, expr_ptr, builtin_decl;
 115   basic_block bb;
 116   HOST_WIDE_INT size;
 117   gimple *stmt, *g;
 118   gimple_seq seq;
 119   location_t loc;
 120   unsigned int align;
 121
 122   size = int_size_in_bytes (TREE_TYPE (expr));
 123   if (size <= 0)
 124     return false;
 125
 126   HOST_WIDE_INT bitsize, bitpos;
 127   tree offset;
 128   machine_mode mode;
 129   int volatilep = 0, unsignedp = 0;
 130   base = get_inner_reference (expr, &bitsize, &bitpos, &offset,
 131                               &mode, &unsignedp, &volatilep, false);
 132
 133   /* No need to instrument accesses to decls that don't escape,
 134      they can't escape to other threads then.  */
 135   if (DECL_P (base) && !is_global_var (base))
 136     {
 137       struct pt_solution pt;
 138       memset (&pt, 0, sizeof (pt));
 139       pt.escaped = 1;
 140       pt.ipa_escaped = flag_ipa_pta != 0;
 141       if (!pt_solution_includes (&pt, base))
 142         return false;
 143       if (!may_be_aliased (base))
 144         return false;
 145     }
 146
 147   if (TREE_READONLY (base)
 148       || (TREE_CODE (base) == VAR_DECL
 149           && DECL_HARD_REGISTER (base)))
 150     return false;
 151
 152   stmt = gsi_stmt (gsi);
 153   loc = gimple_location (stmt);
 154   rhs = is_vptr_store (stmt, expr, is_write);
 155
 156   if ((TREE_CODE (expr) == COMPONENT_REF
 157        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 158       || TREE_CODE (expr) == BIT_FIELD_REF)
 159     {
 160       base = TREE_OPERAND (expr, 0);
 161       if (TREE_CODE (expr) == COMPONENT_REF)
 162         {
 163           expr = TREE_OPERAND (expr, 1);
 164           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 165             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 166           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 167               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 168               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 169             return false;
 170           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 171                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 172           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 173         }
 174       else
 175         {
 176           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 177               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 178             return false;
 179           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 180           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 181         }
 182       if (bitpos < 0 || bitsize <= 0)
 183         return false;
 184       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 185              / BITS_PER_UNIT;
 186       if (may_be_nonaddressable_p (base))
 187         return false;
 188       align = get_object_alignment (base);
 189       if (align < BITS_PER_UNIT)
 190         return false;
 191       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 192       if ((align - 1) & bitpos)
 193         {
 194           align = (align - 1) & bitpos;
 195           align = align & -align;
 196         }
 197       expr = build_fold_addr_expr (unshare_expr (base));
 198       expr = build2 (MEM_REF, char_type_node, expr,
 199                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 200       expr_ptr = build_fold_addr_expr (expr);
 201     }
 202   else
 203     {
 204       if (may_be_nonaddressable_p (expr))
 205         return false;
 206       align = get_object_alignment (expr);
 207       if (align < BITS_PER_UNIT)
 208         return false;
 209       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 210     }
 211   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 212   if ((size & (size - 1)) != 0 || size > 16
 213       || align < MIN (size, 8) * BITS_PER_UNIT)
 214     {
 215       builtin_decl = builtin_decl_implicit (is_write
 216                                             ? BUILT_IN_TSAN_WRITE_RANGE
 217                                             : BUILT_IN_TSAN_READ_RANGE);
 218       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 219     }
 220   else if (rhs == NULL)
 221     g = gimple_build_call (get_memory_access_decl (is_write, size),
 222                            1, expr_ptr);
 223   else
 224     {
 225       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 226       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 227     }
 228   gimple_set_location (g, loc);
 229   gimple_seq_add_stmt_without_update (&seq, g);
 230   /* Instrumentation for assignment of a function result
 231      must be inserted after the call.  Instrumentation for
 232      reads of function arguments must be inserted before the call.
 233      That's because the call can contain synchronization.  */
 234   if (is_gimple_call (stmt) && is_write)
 235     {
 236       /* If the call can throw, it must be the last stmt in
 237          a basic block, so the instrumented stmts need to be
 238          inserted in successor bbs.  */
 239       if (is_ctrl_altering_stmt (stmt))
 240         {
 241           edge e;
 242
 243           bb = gsi_bb (gsi);
 244           e = find_fallthru_edge (bb->succs);
 245           if (e)
 246             gsi_insert_seq_on_edge_immediate (e, seq);
 247         }
 248       else
 249         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 250     }
 251   else
 252     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 253
 254   return true;
 255 }
 256
 257 /* Actions for sync/atomic builtin transformations.  */
 258 enum tsan_atomic_action
 259 {
 260   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 261   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 262 };
 263
 264 /* Table how to map sync/atomic builtins to their corresponding
 265    tsan equivalents.  */
 266 static const struct tsan_map_atomic
 267 {
 268   enum built_in_function fcode, tsan_fcode;
 269   enum tsan_atomic_action action;
 270   enum tree_code code;
 271 } tsan_atomic_table[] =
 272 {
 273 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 274   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 275 #define CHECK_LAST(fcode, tsan_fcode) \
 276   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 277 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 278   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 279 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 280   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 281 #define WEAK_CAS(fcode, tsan_fcode) \
 282   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 283 #define STRONG_CAS(fcode, tsan_fcode) \
 284   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 285 #define BOOL_CAS(fcode, tsan_fcode) \
 286   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 287 #define VAL_CAS(fcode, tsan_fcode) \
 288   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 289 #define LOCK_RELEASE(fcode, tsan_fcode) \
 290   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 291 #define FETCH_OP(fcode, tsan_fcode, code) \
 292   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 293 #define FETCH_OPS(fcode, tsan_fcode, code) \
 294   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 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
 487 /* Instrument an atomic builtin.  */
 488
 489 static void
 490 instrument_builtin_call (gimple_stmt_iterator *gsi)
 491 {
 492   gimple *stmt = gsi_stmt (*gsi), *g;
 493   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 494   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 495   unsigned int i, num = gimple_call_num_args (stmt), j;
 496   for (j = 0; j < 6 && j < num; j++)
 497     args[j] = gimple_call_arg (stmt, j);
 498   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 499     if (fcode != tsan_atomic_table[i].fcode)
 500       continue;
 501     else
 502       {
 503         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 504         if (decl == NULL_TREE)
 505           return;
 506         switch (tsan_atomic_table[i].action)
 507           {
 508           case check_last:
 509           case fetch_op:
 510             last_arg = gimple_call_arg (stmt, num - 1);
 511             if (!tree_fits_uhwi_p (last_arg)
 512                 || memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 513               return;
 514             gimple_call_set_fndecl (stmt, decl);
 515             update_stmt (stmt);
 516             if (tsan_atomic_table[i].action == fetch_op)
 517               {
 518                 args[1] = gimple_call_arg (stmt, 1);
 519                 goto adjust_result;
 520               }
 521             return;
 522           case add_seq_cst:
 523           case add_acquire:
 524           case fetch_op_seq_cst:
 525             gcc_assert (num <= 2);
 526             for (j = 0; j < num; j++)
 527               args[j] = gimple_call_arg (stmt, j);
 528             for (; j < 2; j++)
 529               args[j] = NULL_TREE;
 530             args[num] = build_int_cst (NULL_TREE,
 531                                        tsan_atomic_table[i].action
 532                                        != add_acquire
 533                                        ? MEMMODEL_SEQ_CST
 534                                        : MEMMODEL_ACQUIRE);
 535             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 536             stmt = gsi_stmt (*gsi);
 537             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 538               {
 539               adjust_result:
 540                 lhs = gimple_call_lhs (stmt);
 541                 if (lhs == NULL_TREE)
 542                   return;
 543                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 544                                                 TREE_TYPE (args[1])))
 545                   {
 546                     tree var = make_ssa_name (TREE_TYPE (lhs));
 547                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 548                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 549                     args[1] = var;
 550                   }
 551                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 552                 /* BIT_NOT_EXPR stands for NAND.  */
 553                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 554                   {
 555                     tree var = make_ssa_name (TREE_TYPE (lhs));
 556                     g = gimple_build_assign (var, BIT_AND_EXPR,
 557                                              gimple_call_lhs (stmt), args[1]);
 558                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 559                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 560                   }
 561                 else
 562                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 563                                            gimple_call_lhs (stmt), args[1]);
 564                 update_stmt (stmt);
 565                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 566               }
 567             return;
 568           case weak_cas:
 569             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 570               continue;
 571             /* FALLTHRU */
 572           case strong_cas:
 573             gcc_assert (num == 6);
 574             for (j = 0; j < 6; j++)
 575               args[j] = gimple_call_arg (stmt, j);
 576             if (!tree_fits_uhwi_p (args[4])
 577                 || memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 578               return;
 579             if (!tree_fits_uhwi_p (args[5])
 580                 || memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 581               return;
 582             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 583                                 args[4], args[5]);
 584             return;
 585           case bool_cas:
 586           case val_cas:
 587             gcc_assert (num == 3);
 588             for (j = 0; j < 3; j++)
 589               args[j] = gimple_call_arg (stmt, j);
 590             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 591             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 592             t = create_tmp_var (t);
 593             mark_addressable (t);
 594             if (!useless_type_conversion_p (TREE_TYPE (t),
 595                                             TREE_TYPE (args[1])))
 596               {
 597                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 598                                          NOP_EXPR, args[1]);
 599                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 600                 args[1] = gimple_assign_lhs (g);
 601               }
 602             g = gimple_build_assign (t, args[1]);
 603             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 604             lhs = gimple_call_lhs (stmt);
 605             update_gimple_call (gsi, decl, 5, args[0],
 606                                 build_fold_addr_expr (t), args[2],
 607                                 build_int_cst (NULL_TREE,
 608                                                MEMMODEL_SEQ_CST),
 609                                 build_int_cst (NULL_TREE,
 610                                                MEMMODEL_SEQ_CST));
 611             if (tsan_atomic_table[i].action == val_cas && lhs)
 612               {
 613                 tree cond;
 614                 stmt = gsi_stmt (*gsi);
 615                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 616                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 617                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 618                 cond = build2 (NE_EXPR, boolean_type_node, t,
 619                                build_int_cst (TREE_TYPE (t), 0));
 620                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 621                                          gimple_assign_lhs (g));
 622                 gimple_call_set_lhs (stmt, t);
 623                 update_stmt (stmt);
 624                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 625               }
 626             return;
 627           case lock_release:
 628             gcc_assert (num == 1);
 629             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 630             t = TREE_VALUE (TREE_CHAIN (t));
 631             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 632                                 build_int_cst (t, 0),
 633                                 build_int_cst (NULL_TREE,
 634                                                MEMMODEL_RELEASE));
 635             return;
 636           default:
 637             continue;
 638           }
 639       }
 640 }
 641
 642 /* Instruments the gimple pointed to by GSI. Return
 643    true if func entry/exit should be instrumented.  */
 644
 645 static bool
 646 instrument_gimple (gimple_stmt_iterator *gsi)
 647 {
 648   gimple *stmt;
 649   tree rhs, lhs;
 650   bool instrumented = false;
 651
 652   stmt = gsi_stmt (*gsi);
 653   if (is_gimple_call (stmt)
 654       && (gimple_call_fndecl (stmt)
 655           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 656     {
 657       /* All functions with function call will have exit instrumented,
 658          therefore no function calls other than __tsan_func_exit
 659          shall appear in the functions.  */
 660       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 661       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 662         instrument_builtin_call (gsi);
 663       return true;
 664     }
 665   else if (is_gimple_assign (stmt)
 666            && !gimple_clobber_p (stmt))
 667     {
 668       if (gimple_store_p (stmt))
 669         {
 670           lhs = gimple_assign_lhs (stmt);
 671           instrumented = instrument_expr (*gsi, lhs, true);
 672         }
 673       if (gimple_assign_load_p (stmt))
 674         {
 675           rhs = gimple_assign_rhs1 (stmt);
 676           instrumented = instrument_expr (*gsi, rhs, false);
 677         }
 678     }
 679   return instrumented;
 680 }
 681
 682 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 683
 684 static void
 685 replace_func_exit (gimple *stmt)
 686 {
 687   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 688   gimple *g = gimple_build_call (builtin_decl, 0);
 689   gimple_set_location (g, cfun->function_end_locus);
 690   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 691   gsi_replace (&gsi, g, true);
 692 }
 693
 694 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 695
 696 static void
 697 instrument_func_exit (void)
 698 {
 699   location_t loc;
 700   basic_block exit_bb;
 701   gimple_stmt_iterator gsi;
 702   gimple *stmt, *g;
 703   tree builtin_decl;
 704   edge e;
 705   edge_iterator ei;
 706
 707   /* Find all function exits.  */
 708   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 709   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 710     {
 711       gsi = gsi_last_bb (e->src);
 712       stmt = gsi_stmt (gsi);
 713       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 714                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 715       loc = gimple_location (stmt);
 716       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 717       g = gimple_build_call (builtin_decl, 0);
 718       gimple_set_location (g, loc);
 719       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 720     }
 721 }
 722
 723 /* Instruments all interesting memory accesses in the current function.
 724    Return true if func entry/exit should be instrumented.  */
 725
 726 static bool
 727 instrument_memory_accesses (void)
 728 {
 729   basic_block bb;
 730   gimple_stmt_iterator gsi;
 731   bool fentry_exit_instrument = false;
 732   bool func_exit_seen = false;
 733   auto_vec<gimple *> tsan_func_exits;
 734
 735   FOR_EACH_BB_FN (bb, cfun)
 736     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 737       {
 738         gimple *stmt = gsi_stmt (gsi);
 739         if (is_gimple_call (stmt)
 740             && gimple_call_internal_p (stmt)
 741             && gimple_call_internal_fn (stmt) == IFN_TSAN_FUNC_EXIT)
 742           {
 743             if (fentry_exit_instrument)
 744               replace_func_exit (stmt);
 745             else
 746               tsan_func_exits.safe_push (stmt);
 747             func_exit_seen = true;
 748           }
 749         else
 750           fentry_exit_instrument |= instrument_gimple (&gsi);
 751       }
 752   unsigned int i;
 753   gimple *stmt;
 754   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 755     if (fentry_exit_instrument)
 756       replace_func_exit (stmt);
 757     else
 758       {
 759         gsi = gsi_for_stmt (stmt);
 760         gsi_remove (&gsi, true);
 761       }
 762   if (fentry_exit_instrument && !func_exit_seen)
 763     instrument_func_exit ();
 764   return fentry_exit_instrument;
 765 }
 766
 767 /* Instruments function entry.  */
 768
 769 static void
 770 instrument_func_entry (void)
 771 {
 772   tree ret_addr, builtin_decl;
 773   gimple *g;
 774   gimple_seq seq = NULL;
 775
 776   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 777   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 778   ret_addr = make_ssa_name (ptr_type_node);
 779   gimple_call_set_lhs (g, ret_addr);
 780   gimple_set_location (g, cfun->function_start_locus);
 781   gimple_seq_add_stmt_without_update (&seq, g);
 782
 783   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 784   g = gimple_build_call (builtin_decl, 1, ret_addr);
 785   gimple_set_location (g, cfun->function_start_locus);
 786   gimple_seq_add_stmt_without_update (&seq, g);
 787
 788   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 789   gsi_insert_seq_on_edge_immediate (e, seq);
 790 }
 791
 792 /* ThreadSanitizer instrumentation pass.  */
 793
 794 static unsigned
 795 tsan_pass (void)
 796 {
 797   initialize_sanitizer_builtins ();
 798   if (instrument_memory_accesses ())
 799     instrument_func_entry ();
 800   return 0;
 801 }
 802
 803 /* Inserts __tsan_init () into the list of CTORs.  */
 804
 805 void
 806 tsan_finish_file (void)
 807 {
 808   tree ctor_statements = NULL_TREE;
 809
 810   initialize_sanitizer_builtins ();
 811   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 812   append_to_statement_list (build_call_expr (init_decl, 0),
 813                             &ctor_statements);
 814   cgraph_build_static_cdtor ('I', ctor_statements,
 815                              MAX_RESERVED_INIT_PRIORITY - 1);
 816 }
 817
 818 /* The pass descriptor.  */
 819
 820 namespace {
 821
 822 const pass_data pass_data_tsan =
 823 {
 824   GIMPLE_PASS, /* type */
 825   "tsan", /* name */
 826   OPTGROUP_NONE, /* optinfo_flags */
 827   TV_NONE, /* tv_id */
 828   ( PROP_ssa | PROP_cfg ), /* properties_required */
 829   0, /* properties_provided */
 830   0, /* properties_destroyed */
 831   0, /* todo_flags_start */
 832   TODO_update_ssa, /* todo_flags_finish */
 833 };
 834
 835 class pass_tsan : public gimple_opt_pass
 836 {
 837 public:
 838   pass_tsan (gcc::context *ctxt)
 839     : gimple_opt_pass (pass_data_tsan, ctxt)
 840   {}
 841
 842   /* opt_pass methods: */
 843   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 844   virtual bool gate (function *)
 845 {
 846   return ((flag_sanitize & SANITIZE_THREAD) != 0
 847           && !lookup_attribute ("no_sanitize_thread",
 848                                 DECL_ATTRIBUTES (current_function_decl)));
 849 }
 850
 851   virtual unsigned int execute (function *) { return tsan_pass (); }
 852
 853 }; // class pass_tsan
 854
 855 } // anon namespace
 856
 857 gimple_opt_pass *
 858 make_pass_tsan (gcc::context *ctxt)
 859 {
 860   return new pass_tsan (ctxt);
 861 }
 862
 863 namespace {
 864
 865 const pass_data pass_data_tsan_O0 =
 866 {
 867   GIMPLE_PASS, /* type */
 868   "tsan0", /* 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_O0 : public gimple_opt_pass
 879 {
 880 public:
 881   pass_tsan_O0 (gcc::context *ctxt)
 882     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 883   {}
 884
 885   /* opt_pass methods: */
 886   virtual bool gate (function *)
 887     {
 888       return ((flag_sanitize & SANITIZE_THREAD) != 0 && !optimize
 889               && !lookup_attribute ("no_sanitize_thread",
 890                                     DECL_ATTRIBUTES (current_function_decl)));
 891     }
 892
 893   virtual unsigned int execute (function *) { return tsan_pass (); }
 894
 895 }; // class pass_tsan_O0
 896
 897 } // anon namespace
 898
 899 gimple_opt_pass *
 900 make_pass_tsan_O0 (gcc::context *ctxt)
 901 {
 902   return new pass_tsan_O0 (ctxt);
 903 }