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 "stringpool.h"
  44 #include "attribs.h"
  45 #include "asan.h"
  46 #include "builtins.h"
  47 #include "target.h"
  48
  49 /* Number of instrumented memory accesses in the current function.  */
  50
  51 /* Builds the following decl
  52    void __tsan_read/writeX (void *addr);  */
  53
  54 static tree
  55 get_memory_access_decl (bool is_write, unsigned size)
  56 {
  57   enum built_in_function fcode;
  58
  59   if (size <= 1)
  60     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  61                      : BUILT_IN_TSAN_READ1;
  62   else if (size <= 3)
  63     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  64                      : BUILT_IN_TSAN_READ2;
  65   else if (size <= 7)
  66     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  67                      : BUILT_IN_TSAN_READ4;
  68   else if (size <= 15)
  69     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  70                      : BUILT_IN_TSAN_READ8;
  71   else
  72     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  73                      : BUILT_IN_TSAN_READ16;
  74
  75   return builtin_decl_implicit (fcode);
  76 }
  77
  78 /* Check as to whether EXPR refers to a store to vptr.  */
  79
  80 static tree
  81 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  82 {
  83   if (is_write == true
  84       && gimple_assign_single_p (stmt)
  85       && TREE_CODE (expr) == COMPONENT_REF)
  86     {
  87       tree field = TREE_OPERAND (expr, 1);
  88       if (TREE_CODE (field) == FIELD_DECL
  89           && DECL_VIRTUAL_P (field))
  90         return gimple_assign_rhs1 (stmt);
  91     }
  92   return NULL;
  93 }
  94
  95 /* Instruments EXPR if needed. If any instrumentation is inserted,
  96    return true.  */
  97
  98 static bool
  99 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 100 {
 101   tree base, rhs, expr_ptr, builtin_decl;
 102   basic_block bb;
 103   HOST_WIDE_INT size;
 104   gimple *stmt, *g;
 105   gimple_seq seq;
 106   location_t loc;
 107   unsigned int align;
 108
 109   size = int_size_in_bytes (TREE_TYPE (expr));
 110   if (size <= 0)
 111     return false;
 112
 113   HOST_WIDE_INT bitsize, bitpos;
 114   tree offset;
 115   machine_mode mode;
 116   int unsignedp, reversep, volatilep = 0;
 117   base = get_inner_reference (expr, &bitsize, &bitpos, &offset, &mode,
 118                               &unsignedp, &reversep, &volatilep);
 119
 120   /* No need to instrument accesses to decls that don't escape,
 121      they can't escape to other threads then.  */
 122   if (DECL_P (base) && !is_global_var (base))
 123     {
 124       struct pt_solution pt;
 125       memset (&pt, 0, sizeof (pt));
 126       pt.escaped = 1;
 127       pt.ipa_escaped = flag_ipa_pta != 0;
 128       if (!pt_solution_includes (&pt, base))
 129         return false;
 130       if (!may_be_aliased (base))
 131         return false;
 132     }
 133
 134   if (TREE_READONLY (base) || (VAR_P (base) && DECL_HARD_REGISTER (base)))
 135     return false;
 136
 137   stmt = gsi_stmt (gsi);
 138   loc = gimple_location (stmt);
 139   rhs = is_vptr_store (stmt, expr, is_write);
 140
 141   if ((TREE_CODE (expr) == COMPONENT_REF
 142        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 143       || TREE_CODE (expr) == BIT_FIELD_REF)
 144     {
 145       base = TREE_OPERAND (expr, 0);
 146       if (TREE_CODE (expr) == COMPONENT_REF)
 147         {
 148           expr = TREE_OPERAND (expr, 1);
 149           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 150             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 151           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 152               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 153               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 154             return false;
 155           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 156                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 157           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 158         }
 159       else
 160         {
 161           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 162               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 163             return false;
 164           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 165           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 166         }
 167       if (bitpos < 0 || bitsize <= 0)
 168         return false;
 169       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 170              / BITS_PER_UNIT;
 171       if (may_be_nonaddressable_p (base))
 172         return false;
 173       align = get_object_alignment (base);
 174       if (align < BITS_PER_UNIT)
 175         return false;
 176       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 177       if ((align - 1) & bitpos)
 178         {
 179           align = (align - 1) & bitpos;
 180           align = least_bit_hwi (align);
 181         }
 182       expr = build_fold_addr_expr (unshare_expr (base));
 183       expr = build2 (MEM_REF, char_type_node, expr,
 184                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 185       expr_ptr = build_fold_addr_expr (expr);
 186     }
 187   else
 188     {
 189       if (may_be_nonaddressable_p (expr))
 190         return false;
 191       align = get_object_alignment (expr);
 192       if (align < BITS_PER_UNIT)
 193         return false;
 194       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 195     }
 196   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 197   if ((size & (size - 1)) != 0 || size > 16
 198       || align < MIN (size, 8) * BITS_PER_UNIT)
 199     {
 200       builtin_decl = builtin_decl_implicit (is_write
 201                                             ? BUILT_IN_TSAN_WRITE_RANGE
 202                                             : BUILT_IN_TSAN_READ_RANGE);
 203       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 204     }
 205   else if (rhs == NULL)
 206     g = gimple_build_call (get_memory_access_decl (is_write, size),
 207                            1, expr_ptr);
 208   else
 209     {
 210       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 211       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 212     }
 213   gimple_set_location (g, loc);
 214   gimple_seq_add_stmt_without_update (&seq, g);
 215   /* Instrumentation for assignment of a function result
 216      must be inserted after the call.  Instrumentation for
 217      reads of function arguments must be inserted before the call.
 218      That's because the call can contain synchronization.  */
 219   if (is_gimple_call (stmt) && is_write)
 220     {
 221       /* If the call can throw, it must be the last stmt in
 222          a basic block, so the instrumented stmts need to be
 223          inserted in successor bbs.  */
 224       if (is_ctrl_altering_stmt (stmt))
 225         {
 226           edge e;
 227
 228           bb = gsi_bb (gsi);
 229           e = find_fallthru_edge (bb->succs);
 230           if (e)
 231             gsi_insert_seq_on_edge_immediate (e, seq);
 232         }
 233       else
 234         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 235     }
 236   else
 237     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 238
 239   return true;
 240 }
 241
 242 /* Actions for sync/atomic builtin transformations.  */
 243 enum tsan_atomic_action
 244 {
 245   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 246   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst,
 247   bool_clear, bool_test_and_set
 248 };
 249
 250 /* Table how to map sync/atomic builtins to their corresponding
 251    tsan equivalents.  */
 252 static const struct tsan_map_atomic
 253 {
 254   enum built_in_function fcode, tsan_fcode;
 255   enum tsan_atomic_action action;
 256   enum tree_code code;
 257 } tsan_atomic_table[] =
 258 {
 259 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 260   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 261 #define CHECK_LAST(fcode, tsan_fcode) \
 262   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 263 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 264   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 265 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 266   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 267 #define WEAK_CAS(fcode, tsan_fcode) \
 268   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 269 #define STRONG_CAS(fcode, tsan_fcode) \
 270   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 271 #define BOOL_CAS(fcode, tsan_fcode) \
 272   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 273 #define VAL_CAS(fcode, tsan_fcode) \
 274   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 275 #define LOCK_RELEASE(fcode, tsan_fcode) \
 276   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 277 #define FETCH_OP(fcode, tsan_fcode, code) \
 278   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 279 #define FETCH_OPS(fcode, tsan_fcode, code) \
 280   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 281 #define BOOL_CLEAR(fcode, tsan_fcode) \
 282   TRANSFORM (fcode, tsan_fcode, bool_clear, ERROR_MARK)
 283 #define BOOL_TEST_AND_SET(fcode, tsan_fcode) \
 284   TRANSFORM (fcode, tsan_fcode, bool_test_and_set, ERROR_MARK)
 285
 286   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 287   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 288   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 289   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 290   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 291   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 292   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 293   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 294   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 295   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 296   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 297   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 298   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 299   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 300   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 301   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 302   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 303   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 304   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 305   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 306   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 307   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 308   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 309   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 310   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 311   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 312   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 313   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 314   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 315   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 316   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 317   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 318   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 319   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 320   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 321   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 322   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 323   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 324   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 325   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 326   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 327   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 328   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 329   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 330   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 331
 332   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 333   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 334
 335   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 336   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 337   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 338   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 339   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 340   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 341   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 342   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 343   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 344   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 345   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 346   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 347   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 348   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 349   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 350   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 351   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 352   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 353   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 354   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 355   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 356   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 357   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 358   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 359   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 360   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 361   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 362   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 363   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 364   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 365
 366   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 367   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 368   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 369   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 370   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 371
 372   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 373   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 374   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 375   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 376   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 377   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 378   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 379   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 380   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 381   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 382   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 383   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 384   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 385   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 386   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 387   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 388   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 389   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 390   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 391   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 392   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 393   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 394   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 395   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 396   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 397   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 398   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 399   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 400   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 401   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 402
 403   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 404
 405   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 406   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 407   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 408   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 409   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 410   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 411   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 412   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 413   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 414   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 415   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 416   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 417   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 418   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 419   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 420   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 421   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 422   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 423   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 424   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 425   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 426   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 427   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 428   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 429   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 430   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 431   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 432   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 433   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 434   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 435
 436   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 437   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 438   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 439   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 440   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 441
 442   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 443   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 444               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 445   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 446               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 447   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 448               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 449   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 450               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 451
 452   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 453             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 454   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 455             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 456   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 457             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 458   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 459             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 460   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 461             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 462
 463   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 464   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 465   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 466   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 467   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 468            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 469
 470   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 471   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 472   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 473   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 474   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE),
 475
 476   BOOL_CLEAR (ATOMIC_CLEAR, TSAN_ATOMIC8_STORE),
 477
 478   BOOL_TEST_AND_SET (ATOMIC_TEST_AND_SET, TSAN_ATOMIC8_EXCHANGE)
 479 };
 480
 481 /* Instrument an atomic builtin.  */
 482
 483 static void
 484 instrument_builtin_call (gimple_stmt_iterator *gsi)
 485 {
 486   gimple *stmt = gsi_stmt (*gsi), *g;
 487   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 488   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 489   unsigned int i, num = gimple_call_num_args (stmt), j;
 490   for (j = 0; j < 6 && j < num; j++)
 491     args[j] = gimple_call_arg (stmt, j);
 492   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 493     if (fcode != tsan_atomic_table[i].fcode)
 494       continue;
 495     else
 496       {
 497         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 498         if (decl == NULL_TREE)
 499           return;
 500         switch (tsan_atomic_table[i].action)
 501           {
 502           case check_last:
 503           case fetch_op:
 504             last_arg = gimple_call_arg (stmt, num - 1);
 505             if (tree_fits_uhwi_p (last_arg)
 506                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 507               return;
 508             gimple_call_set_fndecl (stmt, decl);
 509             update_stmt (stmt);
 510             maybe_clean_eh_stmt (stmt);
 511             if (tsan_atomic_table[i].action == fetch_op)
 512               {
 513                 args[1] = gimple_call_arg (stmt, 1);
 514                 goto adjust_result;
 515               }
 516             return;
 517           case add_seq_cst:
 518           case add_acquire:
 519           case fetch_op_seq_cst:
 520             gcc_assert (num <= 2);
 521             for (j = 0; j < num; j++)
 522               args[j] = gimple_call_arg (stmt, j);
 523             for (; j < 2; j++)
 524               args[j] = NULL_TREE;
 525             args[num] = build_int_cst (NULL_TREE,
 526                                        tsan_atomic_table[i].action
 527                                        != add_acquire
 528                                        ? MEMMODEL_SEQ_CST
 529                                        : MEMMODEL_ACQUIRE);
 530             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 531             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 532             stmt = gsi_stmt (*gsi);
 533             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 534               {
 535               adjust_result:
 536                 lhs = gimple_call_lhs (stmt);
 537                 if (lhs == NULL_TREE)
 538                   return;
 539                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 540                                                 TREE_TYPE (args[1])))
 541                   {
 542                     tree var = make_ssa_name (TREE_TYPE (lhs));
 543                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 544                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 545                     args[1] = var;
 546                   }
 547                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 548                 /* BIT_NOT_EXPR stands for NAND.  */
 549                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 550                   {
 551                     tree var = make_ssa_name (TREE_TYPE (lhs));
 552                     g = gimple_build_assign (var, BIT_AND_EXPR,
 553                                              gimple_call_lhs (stmt), args[1]);
 554                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 555                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 556                   }
 557                 else
 558                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 559                                            gimple_call_lhs (stmt), args[1]);
 560                 update_stmt (stmt);
 561                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 562               }
 563             return;
 564           case weak_cas:
 565             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 566               continue;
 567             /* FALLTHRU */
 568           case strong_cas:
 569             gcc_assert (num == 6);
 570             for (j = 0; j < 6; j++)
 571               args[j] = gimple_call_arg (stmt, j);
 572             if (tree_fits_uhwi_p (args[4])
 573                 && memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 574               return;
 575             if (tree_fits_uhwi_p (args[5])
 576                 && memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 577               return;
 578             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 579                                 args[4], args[5]);
 580             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 581             return;
 582           case bool_cas:
 583           case val_cas:
 584             gcc_assert (num == 3);
 585             for (j = 0; j < 3; j++)
 586               args[j] = gimple_call_arg (stmt, j);
 587             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 588             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 589             t = create_tmp_var (t);
 590             mark_addressable (t);
 591             if (!useless_type_conversion_p (TREE_TYPE (t),
 592                                             TREE_TYPE (args[1])))
 593               {
 594                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 595                                          NOP_EXPR, args[1]);
 596                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 597                 args[1] = gimple_assign_lhs (g);
 598               }
 599             g = gimple_build_assign (t, args[1]);
 600             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 601             lhs = gimple_call_lhs (stmt);
 602             update_gimple_call (gsi, decl, 5, args[0],
 603                                 build_fold_addr_expr (t), args[2],
 604                                 build_int_cst (NULL_TREE,
 605                                                MEMMODEL_SEQ_CST),
 606                                 build_int_cst (NULL_TREE,
 607                                                MEMMODEL_SEQ_CST));
 608             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 609             if (tsan_atomic_table[i].action == val_cas && lhs)
 610               {
 611                 tree cond;
 612                 stmt = gsi_stmt (*gsi);
 613                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 614                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 615                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 616                 cond = build2 (NE_EXPR, boolean_type_node, t,
 617                                build_int_cst (TREE_TYPE (t), 0));
 618                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 619                                          gimple_assign_lhs (g));
 620                 gimple_call_set_lhs (stmt, t);
 621                 update_stmt (stmt);
 622                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 623               }
 624             return;
 625           case lock_release:
 626             gcc_assert (num == 1);
 627             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 628             t = TREE_VALUE (TREE_CHAIN (t));
 629             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 630                                 build_int_cst (t, 0),
 631                                 build_int_cst (NULL_TREE,
 632                                                MEMMODEL_RELEASE));
 633             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 634             return;
 635           case bool_clear:
 636           case bool_test_and_set:
 637             if (BOOL_TYPE_SIZE != 8)
 638               {
 639                 decl = NULL_TREE;
 640                 for (j = 1; j < 5; j++)
 641                   if (BOOL_TYPE_SIZE == (8 << j))
 642                     {
 643                       enum built_in_function tsan_fcode
 644                         = (enum built_in_function)
 645                           (tsan_atomic_table[i].tsan_fcode + j);
 646                       decl = builtin_decl_implicit (tsan_fcode);
 647                       break;
 648                     }
 649                 if (decl == NULL_TREE)
 650                   return;
 651               }
 652             last_arg = gimple_call_arg (stmt, num - 1);
 653             if (tree_fits_uhwi_p (last_arg)
 654                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 655               return;
 656             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 657             t = TREE_VALUE (TREE_CHAIN (t));
 658             if (tsan_atomic_table[i].action == bool_clear)
 659               {
 660                 update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 661                                     build_int_cst (t, 0), last_arg);
 662                 maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 663                 return;
 664               }
 665             t = build_int_cst (t, targetm.atomic_test_and_set_trueval);
 666             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 667                                 t, last_arg);
 668             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 669             stmt = gsi_stmt (*gsi);
 670             lhs = gimple_call_lhs (stmt);
 671             if (lhs == NULL_TREE)
 672               return;
 673             if (targetm.atomic_test_and_set_trueval != 1
 674                 || !useless_type_conversion_p (TREE_TYPE (lhs),
 675                                                TREE_TYPE (t)))
 676               {
 677                 tree new_lhs = make_ssa_name (TREE_TYPE (t));
 678                 gimple_call_set_lhs (stmt, new_lhs);
 679                 if (targetm.atomic_test_and_set_trueval != 1)
 680                   g = gimple_build_assign (lhs, NE_EXPR, new_lhs,
 681                                            build_int_cst (TREE_TYPE (t), 0));
 682                 else
 683                   g = gimple_build_assign (lhs, NOP_EXPR, new_lhs);
 684                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 685                 update_stmt (stmt);
 686               }
 687             return;
 688           default:
 689             continue;
 690           }
 691       }
 692 }
 693
 694 /* Instruments the gimple pointed to by GSI. Return
 695    true if func entry/exit should be instrumented.  */
 696
 697 static bool
 698 instrument_gimple (gimple_stmt_iterator *gsi)
 699 {
 700   gimple *stmt;
 701   tree rhs, lhs;
 702   bool instrumented = false;
 703
 704   stmt = gsi_stmt (*gsi);
 705   if (is_gimple_call (stmt)
 706       && (gimple_call_fndecl (stmt)
 707           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 708     {
 709       /* All functions with function call will have exit instrumented,
 710          therefore no function calls other than __tsan_func_exit
 711          shall appear in the functions.  */
 712       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 713       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 714         instrument_builtin_call (gsi);
 715       return true;
 716     }
 717   else if (is_gimple_assign (stmt)
 718            && !gimple_clobber_p (stmt))
 719     {
 720       if (gimple_store_p (stmt))
 721         {
 722           lhs = gimple_assign_lhs (stmt);
 723           instrumented = instrument_expr (*gsi, lhs, true);
 724         }
 725       if (gimple_assign_load_p (stmt))
 726         {
 727           rhs = gimple_assign_rhs1 (stmt);
 728           instrumented = instrument_expr (*gsi, rhs, false);
 729         }
 730     }
 731   return instrumented;
 732 }
 733
 734 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 735
 736 static void
 737 replace_func_exit (gimple *stmt)
 738 {
 739   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 740   gimple *g = gimple_build_call (builtin_decl, 0);
 741   gimple_set_location (g, cfun->function_end_locus);
 742   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 743   gsi_replace (&gsi, g, true);
 744 }
 745
 746 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 747
 748 static void
 749 instrument_func_exit (void)
 750 {
 751   location_t loc;
 752   basic_block exit_bb;
 753   gimple_stmt_iterator gsi;
 754   gimple *stmt, *g;
 755   tree builtin_decl;
 756   edge e;
 757   edge_iterator ei;
 758
 759   /* Find all function exits.  */
 760   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 761   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 762     {
 763       gsi = gsi_last_bb (e->src);
 764       stmt = gsi_stmt (gsi);
 765       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 766                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 767       loc = gimple_location (stmt);
 768       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 769       g = gimple_build_call (builtin_decl, 0);
 770       gimple_set_location (g, loc);
 771       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 772     }
 773 }
 774
 775 /* Instruments all interesting memory accesses in the current function.
 776    Return true if func entry/exit should be instrumented.  */
 777
 778 static bool
 779 instrument_memory_accesses (bool *cfg_changed)
 780 {
 781   basic_block bb;
 782   gimple_stmt_iterator gsi;
 783   bool fentry_exit_instrument = false;
 784   bool func_exit_seen = false;
 785   auto_vec<gimple *> tsan_func_exits;
 786
 787   FOR_EACH_BB_FN (bb, cfun)
 788     {
 789       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 790         {
 791           gimple *stmt = gsi_stmt (gsi);
 792           if (gimple_call_internal_p (stmt, IFN_TSAN_FUNC_EXIT))
 793             {
 794               if (fentry_exit_instrument)
 795                 replace_func_exit (stmt);
 796               else
 797                 tsan_func_exits.safe_push (stmt);
 798               func_exit_seen = true;
 799             }
 800           else
 801             fentry_exit_instrument |= instrument_gimple (&gsi);
 802         }
 803       if (gimple_purge_dead_eh_edges (bb))
 804         *cfg_changed = true;
 805     }
 806   unsigned int i;
 807   gimple *stmt;
 808   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 809     if (fentry_exit_instrument)
 810       replace_func_exit (stmt);
 811     else
 812       {
 813         gsi = gsi_for_stmt (stmt);
 814         gsi_remove (&gsi, true);
 815       }
 816   if (fentry_exit_instrument && !func_exit_seen)
 817     instrument_func_exit ();
 818   return fentry_exit_instrument;
 819 }
 820
 821 /* Instruments function entry.  */
 822
 823 static void
 824 instrument_func_entry (void)
 825 {
 826   tree ret_addr, builtin_decl;
 827   gimple *g;
 828   gimple_seq seq = NULL;
 829
 830   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 831   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 832   ret_addr = make_ssa_name (ptr_type_node);
 833   gimple_call_set_lhs (g, ret_addr);
 834   gimple_set_location (g, cfun->function_start_locus);
 835   gimple_seq_add_stmt_without_update (&seq, g);
 836
 837   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 838   g = gimple_build_call (builtin_decl, 1, ret_addr);
 839   gimple_set_location (g, cfun->function_start_locus);
 840   gimple_seq_add_stmt_without_update (&seq, g);
 841
 842   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 843   gsi_insert_seq_on_edge_immediate (e, seq);
 844 }
 845
 846 /* ThreadSanitizer instrumentation pass.  */
 847
 848 static unsigned
 849 tsan_pass (void)
 850 {
 851   initialize_sanitizer_builtins ();
 852   bool cfg_changed = false;
 853   if (instrument_memory_accesses (&cfg_changed))
 854     instrument_func_entry ();
 855   return cfg_changed ? TODO_cleanup_cfg : 0;
 856 }
 857
 858 /* Inserts __tsan_init () into the list of CTORs.  */
 859
 860 void
 861 tsan_finish_file (void)
 862 {
 863   tree ctor_statements = NULL_TREE;
 864
 865   initialize_sanitizer_builtins ();
 866   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 867   append_to_statement_list (build_call_expr (init_decl, 0),
 868                             &ctor_statements);
 869   cgraph_build_static_cdtor ('I', ctor_statements,
 870                              MAX_RESERVED_INIT_PRIORITY - 1);
 871 }
 872
 873 /* The pass descriptor.  */
 874
 875 namespace {
 876
 877 const pass_data pass_data_tsan =
 878 {
 879   GIMPLE_PASS, /* type */
 880   "tsan", /* name */
 881   OPTGROUP_NONE, /* optinfo_flags */
 882   TV_NONE, /* tv_id */
 883   ( PROP_ssa | PROP_cfg ), /* properties_required */
 884   0, /* properties_provided */
 885   0, /* properties_destroyed */
 886   0, /* todo_flags_start */
 887   TODO_update_ssa, /* todo_flags_finish */
 888 };
 889
 890 class pass_tsan : public gimple_opt_pass
 891 {
 892 public:
 893   pass_tsan (gcc::context *ctxt)
 894     : gimple_opt_pass (pass_data_tsan, ctxt)
 895   {}
 896
 897   /* opt_pass methods: */
 898   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 899   virtual bool gate (function *)
 900 {
 901   return sanitize_flags_p (SANITIZE_THREAD);
 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 (sanitize_flags_p (SANITIZE_THREAD) && !optimize);
 942     }
 943
 944   virtual unsigned int execute (function *) { return tsan_pass (); }
 945
 946 }; // class pass_tsan_O0
 947
 948 } // anon namespace
 949
 950 gimple_opt_pass *
 951 make_pass_tsan_O0 (gcc::context *ctxt)
 952 {
 953   return new pass_tsan_O0 (ctxt);
 954 }