gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2017 Free Software Foundation, Inc.
   3    Contributed by Dmitry Vyukov <dvyukov@google.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "backend.h"
  26 #include "rtl.h"
  27 #include "tree.h"
  28 #include "memmodel.h"
  29 #include "gimple.h"
  30 #include "tree-pass.h"
  31 #include "ssa.h"
  32 #include "cgraph.h"
  33 #include "fold-const.h"
  34 #include "gimplify.h"
  35 #include "gimple-iterator.h"
  36 #include "gimplify-me.h"
  37 #include "tree-cfg.h"
  38 #include "tree-iterator.h"
  39 #include "tree-ssa-propagate.h"
  40 #include "tree-ssa-loop-ivopts.h"
  41 #include "tree-eh.h"
  42 #include "tsan.h"
  43 #include "asan.h"
  44 #include "builtins.h"
  45 #include "target.h"
  46
  47 /* Number of instrumented memory accesses in the current function.  */
  48
  49 /* Builds the following decl
  50    void __tsan_read/writeX (void *addr);  */
  51
  52 static tree
  53 get_memory_access_decl (bool is_write, unsigned size)
  54 {
  55   enum built_in_function fcode;
  56
  57   if (size <= 1)
  58     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  59                      : BUILT_IN_TSAN_READ1;
  60   else if (size <= 3)
  61     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  62                      : BUILT_IN_TSAN_READ2;
  63   else if (size <= 7)
  64     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  65                      : BUILT_IN_TSAN_READ4;
  66   else if (size <= 15)
  67     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  68                      : BUILT_IN_TSAN_READ8;
  69   else
  70     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  71                      : BUILT_IN_TSAN_READ16;
  72
  73   return builtin_decl_implicit (fcode);
  74 }
  75
  76 /* Check as to whether EXPR refers to a store to vptr.  */
  77
  78 static tree
  79 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  80 {
  81   if (is_write == true
  82       && gimple_assign_single_p (stmt)
  83       && TREE_CODE (expr) == COMPONENT_REF)
  84     {
  85       tree field = TREE_OPERAND (expr, 1);
  86       if (TREE_CODE (field) == FIELD_DECL
  87           && DECL_VIRTUAL_P (field))
  88         return gimple_assign_rhs1 (stmt);
  89     }
  90   return NULL;
  91 }
  92
  93 /* Instruments EXPR if needed. If any instrumentation is inserted,
  94    return true.  */
  95
  96 static bool
  97 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
  98 {
  99   tree base, rhs, expr_ptr, builtin_decl;
 100   basic_block bb;
 101   HOST_WIDE_INT size;
 102   gimple *stmt, *g;
 103   gimple_seq seq;
 104   location_t loc;
 105   unsigned int align;
 106
 107   size = int_size_in_bytes (TREE_TYPE (expr));
 108   if (size <= 0)
 109     return false;
 110
 111   HOST_WIDE_INT bitsize, bitpos;
 112   tree offset;
 113   machine_mode mode;
 114   int unsignedp, reversep, volatilep = 0;
 115   base = get_inner_reference (expr, &bitsize, &bitpos, &offset, &mode,
 116                               &unsignedp, &reversep, &volatilep);
 117
 118   /* No need to instrument accesses to decls that don't escape,
 119      they can't escape to other threads then.  */
 120   if (DECL_P (base) && !is_global_var (base))
 121     {
 122       struct pt_solution pt;
 123       memset (&pt, 0, sizeof (pt));
 124       pt.escaped = 1;
 125       pt.ipa_escaped = flag_ipa_pta != 0;
 126       if (!pt_solution_includes (&pt, base))
 127         return false;
 128       if (!may_be_aliased (base))
 129         return false;
 130     }
 131
 132   if (TREE_READONLY (base) || (VAR_P (base) && 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 = least_bit_hwi (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             maybe_clean_eh_stmt (stmt);
 509             if (tsan_atomic_table[i].action == fetch_op)
 510               {
 511                 args[1] = gimple_call_arg (stmt, 1);
 512                 goto adjust_result;
 513               }
 514             return;
 515           case add_seq_cst:
 516           case add_acquire:
 517           case fetch_op_seq_cst:
 518             gcc_assert (num <= 2);
 519             for (j = 0; j < num; j++)
 520               args[j] = gimple_call_arg (stmt, j);
 521             for (; j < 2; j++)
 522               args[j] = NULL_TREE;
 523             args[num] = build_int_cst (NULL_TREE,
 524                                        tsan_atomic_table[i].action
 525                                        != add_acquire
 526                                        ? MEMMODEL_SEQ_CST
 527                                        : MEMMODEL_ACQUIRE);
 528             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 529             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 530             stmt = gsi_stmt (*gsi);
 531             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 532               {
 533               adjust_result:
 534                 lhs = gimple_call_lhs (stmt);
 535                 if (lhs == NULL_TREE)
 536                   return;
 537                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 538                                                 TREE_TYPE (args[1])))
 539                   {
 540                     tree var = make_ssa_name (TREE_TYPE (lhs));
 541                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 542                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 543                     args[1] = var;
 544                   }
 545                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 546                 /* BIT_NOT_EXPR stands for NAND.  */
 547                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 548                   {
 549                     tree var = make_ssa_name (TREE_TYPE (lhs));
 550                     g = gimple_build_assign (var, BIT_AND_EXPR,
 551                                              gimple_call_lhs (stmt), args[1]);
 552                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 553                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 554                   }
 555                 else
 556                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 557                                            gimple_call_lhs (stmt), args[1]);
 558                 update_stmt (stmt);
 559                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 560               }
 561             return;
 562           case weak_cas:
 563             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 564               continue;
 565             /* FALLTHRU */
 566           case strong_cas:
 567             gcc_assert (num == 6);
 568             for (j = 0; j < 6; j++)
 569               args[j] = gimple_call_arg (stmt, j);
 570             if (tree_fits_uhwi_p (args[4])
 571                 && memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 572               return;
 573             if (tree_fits_uhwi_p (args[5])
 574                 && memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 575               return;
 576             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 577                                 args[4], args[5]);
 578             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 579             return;
 580           case bool_cas:
 581           case val_cas:
 582             gcc_assert (num == 3);
 583             for (j = 0; j < 3; j++)
 584               args[j] = gimple_call_arg (stmt, j);
 585             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 586             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 587             t = create_tmp_var (t);
 588             mark_addressable (t);
 589             if (!useless_type_conversion_p (TREE_TYPE (t),
 590                                             TREE_TYPE (args[1])))
 591               {
 592                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 593                                          NOP_EXPR, args[1]);
 594                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 595                 args[1] = gimple_assign_lhs (g);
 596               }
 597             g = gimple_build_assign (t, args[1]);
 598             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 599             lhs = gimple_call_lhs (stmt);
 600             update_gimple_call (gsi, decl, 5, args[0],
 601                                 build_fold_addr_expr (t), args[2],
 602                                 build_int_cst (NULL_TREE,
 603                                                MEMMODEL_SEQ_CST),
 604                                 build_int_cst (NULL_TREE,
 605                                                MEMMODEL_SEQ_CST));
 606             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 607             if (tsan_atomic_table[i].action == val_cas && lhs)
 608               {
 609                 tree cond;
 610                 stmt = gsi_stmt (*gsi);
 611                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 612                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 613                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 614                 cond = build2 (NE_EXPR, boolean_type_node, t,
 615                                build_int_cst (TREE_TYPE (t), 0));
 616                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 617                                          gimple_assign_lhs (g));
 618                 gimple_call_set_lhs (stmt, t);
 619                 update_stmt (stmt);
 620                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 621               }
 622             return;
 623           case lock_release:
 624             gcc_assert (num == 1);
 625             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 626             t = TREE_VALUE (TREE_CHAIN (t));
 627             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 628                                 build_int_cst (t, 0),
 629                                 build_int_cst (NULL_TREE,
 630                                                MEMMODEL_RELEASE));
 631             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 632             return;
 633           case bool_clear:
 634           case bool_test_and_set:
 635             if (BOOL_TYPE_SIZE != 8)
 636               {
 637                 decl = NULL_TREE;
 638                 for (j = 1; j < 5; j++)
 639                   if (BOOL_TYPE_SIZE == (8 << j))
 640                     {
 641                       enum built_in_function tsan_fcode
 642                         = (enum built_in_function)
 643                           (tsan_atomic_table[i].tsan_fcode + j);
 644                       decl = builtin_decl_implicit (tsan_fcode);
 645                       break;
 646                     }
 647                 if (decl == NULL_TREE)
 648                   return;
 649               }
 650             last_arg = gimple_call_arg (stmt, num - 1);
 651             if (tree_fits_uhwi_p (last_arg)
 652                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 653               return;
 654             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 655             t = TREE_VALUE (TREE_CHAIN (t));
 656             if (tsan_atomic_table[i].action == bool_clear)
 657               {
 658                 update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 659                                     build_int_cst (t, 0), last_arg);
 660                 maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 661                 return;
 662               }
 663             t = build_int_cst (t, targetm.atomic_test_and_set_trueval);
 664             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 665                                 t, last_arg);
 666             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 667             stmt = gsi_stmt (*gsi);
 668             lhs = gimple_call_lhs (stmt);
 669             if (lhs == NULL_TREE)
 670               return;
 671             if (targetm.atomic_test_and_set_trueval != 1
 672                 || !useless_type_conversion_p (TREE_TYPE (lhs),
 673                                                TREE_TYPE (t)))
 674               {
 675                 tree new_lhs = make_ssa_name (TREE_TYPE (t));
 676                 gimple_call_set_lhs (stmt, new_lhs);
 677                 if (targetm.atomic_test_and_set_trueval != 1)
 678                   g = gimple_build_assign (lhs, NE_EXPR, new_lhs,
 679                                            build_int_cst (TREE_TYPE (t), 0));
 680                 else
 681                   g = gimple_build_assign (lhs, NOP_EXPR, new_lhs);
 682                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 683                 update_stmt (stmt);
 684               }
 685             return;
 686           default:
 687             continue;
 688           }
 689       }
 690 }
 691
 692 /* Instruments the gimple pointed to by GSI. Return
 693    true if func entry/exit should be instrumented.  */
 694
 695 static bool
 696 instrument_gimple (gimple_stmt_iterator *gsi)
 697 {
 698   gimple *stmt;
 699   tree rhs, lhs;
 700   bool instrumented = false;
 701
 702   stmt = gsi_stmt (*gsi);
 703   if (is_gimple_call (stmt)
 704       && (gimple_call_fndecl (stmt)
 705           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 706     {
 707       /* All functions with function call will have exit instrumented,
 708          therefore no function calls other than __tsan_func_exit
 709          shall appear in the functions.  */
 710       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 711       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 712         instrument_builtin_call (gsi);
 713       return true;
 714     }
 715   else if (is_gimple_assign (stmt)
 716            && !gimple_clobber_p (stmt))
 717     {
 718       if (gimple_store_p (stmt))
 719         {
 720           lhs = gimple_assign_lhs (stmt);
 721           instrumented = instrument_expr (*gsi, lhs, true);
 722         }
 723       if (gimple_assign_load_p (stmt))
 724         {
 725           rhs = gimple_assign_rhs1 (stmt);
 726           instrumented = instrument_expr (*gsi, rhs, false);
 727         }
 728     }
 729   return instrumented;
 730 }
 731
 732 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 733
 734 static void
 735 replace_func_exit (gimple *stmt)
 736 {
 737   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 738   gimple *g = gimple_build_call (builtin_decl, 0);
 739   gimple_set_location (g, cfun->function_end_locus);
 740   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 741   gsi_replace (&gsi, g, true);
 742 }
 743
 744 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 745
 746 static void
 747 instrument_func_exit (void)
 748 {
 749   location_t loc;
 750   basic_block exit_bb;
 751   gimple_stmt_iterator gsi;
 752   gimple *stmt, *g;
 753   tree builtin_decl;
 754   edge e;
 755   edge_iterator ei;
 756
 757   /* Find all function exits.  */
 758   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 759   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 760     {
 761       gsi = gsi_last_bb (e->src);
 762       stmt = gsi_stmt (gsi);
 763       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 764                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 765       loc = gimple_location (stmt);
 766       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 767       g = gimple_build_call (builtin_decl, 0);
 768       gimple_set_location (g, loc);
 769       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 770     }
 771 }
 772
 773 /* Instruments all interesting memory accesses in the current function.
 774    Return true if func entry/exit should be instrumented.  */
 775
 776 static bool
 777 instrument_memory_accesses (bool *cfg_changed)
 778 {
 779   basic_block bb;
 780   gimple_stmt_iterator gsi;
 781   bool fentry_exit_instrument = false;
 782   bool func_exit_seen = false;
 783   auto_vec<gimple *> tsan_func_exits;
 784
 785   FOR_EACH_BB_FN (bb, cfun)
 786     {
 787       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 788         {
 789           gimple *stmt = gsi_stmt (gsi);
 790           if (gimple_call_internal_p (stmt, IFN_TSAN_FUNC_EXIT))
 791             {
 792               if (fentry_exit_instrument)
 793                 replace_func_exit (stmt);
 794               else
 795                 tsan_func_exits.safe_push (stmt);
 796               func_exit_seen = true;
 797             }
 798           else
 799             fentry_exit_instrument |= instrument_gimple (&gsi);
 800         }
 801       if (gimple_purge_dead_eh_edges (bb))
 802         *cfg_changed = true;
 803     }
 804   unsigned int i;
 805   gimple *stmt;
 806   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 807     if (fentry_exit_instrument)
 808       replace_func_exit (stmt);
 809     else
 810       {
 811         gsi = gsi_for_stmt (stmt);
 812         gsi_remove (&gsi, true);
 813       }
 814   if (fentry_exit_instrument && !func_exit_seen)
 815     instrument_func_exit ();
 816   return fentry_exit_instrument;
 817 }
 818
 819 /* Instruments function entry.  */
 820
 821 static void
 822 instrument_func_entry (void)
 823 {
 824   tree ret_addr, builtin_decl;
 825   gimple *g;
 826   gimple_seq seq = NULL;
 827
 828   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 829   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 830   ret_addr = make_ssa_name (ptr_type_node);
 831   gimple_call_set_lhs (g, ret_addr);
 832   gimple_set_location (g, cfun->function_start_locus);
 833   gimple_seq_add_stmt_without_update (&seq, g);
 834
 835   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 836   g = gimple_build_call (builtin_decl, 1, ret_addr);
 837   gimple_set_location (g, cfun->function_start_locus);
 838   gimple_seq_add_stmt_without_update (&seq, g);
 839
 840   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 841   gsi_insert_seq_on_edge_immediate (e, seq);
 842 }
 843
 844 /* ThreadSanitizer instrumentation pass.  */
 845
 846 static unsigned
 847 tsan_pass (void)
 848 {
 849   initialize_sanitizer_builtins ();
 850   bool cfg_changed = false;
 851   if (instrument_memory_accesses (&cfg_changed))
 852     instrument_func_entry ();
 853   return cfg_changed ? TODO_cleanup_cfg : 0;
 854 }
 855
 856 /* Inserts __tsan_init () into the list of CTORs.  */
 857
 858 void
 859 tsan_finish_file (void)
 860 {
 861   tree ctor_statements = NULL_TREE;
 862
 863   initialize_sanitizer_builtins ();
 864   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 865   append_to_statement_list (build_call_expr (init_decl, 0),
 866                             &ctor_statements);
 867   cgraph_build_static_cdtor ('I', ctor_statements,
 868                              MAX_RESERVED_INIT_PRIORITY - 1);
 869 }
 870
 871 /* The pass descriptor.  */
 872
 873 namespace {
 874
 875 const pass_data pass_data_tsan =
 876 {
 877   GIMPLE_PASS, /* type */
 878   "tsan", /* name */
 879   OPTGROUP_NONE, /* optinfo_flags */
 880   TV_NONE, /* tv_id */
 881   ( PROP_ssa | PROP_cfg ), /* properties_required */
 882   0, /* properties_provided */
 883   0, /* properties_destroyed */
 884   0, /* todo_flags_start */
 885   TODO_update_ssa, /* todo_flags_finish */
 886 };
 887
 888 class pass_tsan : public gimple_opt_pass
 889 {
 890 public:
 891   pass_tsan (gcc::context *ctxt)
 892     : gimple_opt_pass (pass_data_tsan, ctxt)
 893   {}
 894
 895   /* opt_pass methods: */
 896   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 897   virtual bool gate (function *)
 898 {
 899   return ((flag_sanitize & SANITIZE_THREAD) != 0
 900           && !lookup_attribute ("no_sanitize_thread",
 901                                 DECL_ATTRIBUTES (current_function_decl)));
 902 }
 903
 904   virtual unsigned int execute (function *) { return tsan_pass (); }
 905
 906 }; // class pass_tsan
 907
 908 } // anon namespace
 909
 910 gimple_opt_pass *
 911 make_pass_tsan (gcc::context *ctxt)
 912 {
 913   return new pass_tsan (ctxt);
 914 }
 915
 916 namespace {
 917
 918 const pass_data pass_data_tsan_O0 =
 919 {
 920   GIMPLE_PASS, /* type */
 921   "tsan0", /* name */
 922   OPTGROUP_NONE, /* optinfo_flags */
 923   TV_NONE, /* tv_id */
 924   ( PROP_ssa | PROP_cfg ), /* properties_required */
 925   0, /* properties_provided */
 926   0, /* properties_destroyed */
 927   0, /* todo_flags_start */
 928   TODO_update_ssa, /* todo_flags_finish */
 929 };
 930
 931 class pass_tsan_O0 : public gimple_opt_pass
 932 {
 933 public:
 934   pass_tsan_O0 (gcc::context *ctxt)
 935     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 936   {}
 937
 938   /* opt_pass methods: */
 939   virtual bool gate (function *)
 940     {
 941       return ((flag_sanitize & SANITIZE_THREAD) != 0 && !optimize
 942               && !lookup_attribute ("no_sanitize_thread",
 943                                     DECL_ATTRIBUTES (current_function_decl)));
 944     }
 945
 946   virtual unsigned int execute (function *) { return tsan_pass (); }
 947
 948 }; // class pass_tsan_O0
 949
 950 } // anon namespace
 951
 952 gimple_opt_pass *
 953 make_pass_tsan_O0 (gcc::context *ctxt)
 954 {
 955   return new pass_tsan_O0 (ctxt);
 956 }