gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2020 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, bool volatilep)
  56 {
  57   enum built_in_function fcode;
  58   int pos;
  59
  60   if (size <= 1)
  61     pos = 0;
  62   else if (size <= 3)
  63     pos = 1;
  64   else if (size <= 7)
  65     pos = 2;
  66   else if (size <= 15)
  67     pos = 3;
  68   else
  69     pos = 4;
  70
  71   if (param_tsan_distinguish_volatile && volatilep)
  72     fcode = is_write ? BUILT_IN_TSAN_VOLATILE_WRITE1
  73                      : BUILT_IN_TSAN_VOLATILE_READ1;
  74   else
  75     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  76                      : BUILT_IN_TSAN_READ1;
  77   fcode = (built_in_function)(fcode + pos);
  78
  79   return builtin_decl_implicit (fcode);
  80 }
  81
  82 /* Check as to whether EXPR refers to a store to vptr.  */
  83
  84 static tree
  85 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  86 {
  87   if (is_write == true
  88       && gimple_assign_single_p (stmt)
  89       && TREE_CODE (expr) == COMPONENT_REF)
  90     {
  91       tree field = TREE_OPERAND (expr, 1);
  92       if (TREE_CODE (field) == FIELD_DECL
  93           && DECL_VIRTUAL_P (field))
  94         return gimple_assign_rhs1 (stmt);
  95     }
  96   return NULL;
  97 }
  98
  99 /* Instruments EXPR if needed. If any instrumentation is inserted,
 100    return true.  */
 101
 102 static bool
 103 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 104 {
 105   tree base, rhs, expr_ptr, builtin_decl;
 106   basic_block bb;
 107   HOST_WIDE_INT size;
 108   gimple *stmt, *g;
 109   gimple_seq seq;
 110   location_t loc;
 111   unsigned int align;
 112
 113   size = int_size_in_bytes (TREE_TYPE (expr));
 114   if (size <= 0)
 115     return false;
 116
 117   poly_int64 unused_bitsize, unused_bitpos;
 118   tree offset;
 119   machine_mode mode;
 120   int unsignedp, reversep, volatilep = 0;
 121   base = get_inner_reference (expr, &unused_bitsize, &unused_bitpos, &offset,
 122                               &mode, &unsignedp, &reversep, &volatilep);
 123
 124   /* No need to instrument accesses to decls that don't escape,
 125      they can't escape to other threads then.  */
 126   if (DECL_P (base) && !is_global_var (base))
 127     {
 128       struct pt_solution pt;
 129       memset (&pt, 0, sizeof (pt));
 130       pt.escaped = 1;
 131       pt.ipa_escaped = flag_ipa_pta != 0;
 132       if (!pt_solution_includes (&pt, base))
 133         return false;
 134       if (!may_be_aliased (base))
 135         return false;
 136     }
 137
 138   if (TREE_READONLY (base) || (VAR_P (base) && DECL_HARD_REGISTER (base)))
 139     return false;
 140
 141   stmt = gsi_stmt (gsi);
 142   loc = gimple_location (stmt);
 143   rhs = is_vptr_store (stmt, expr, is_write);
 144
 145   if ((TREE_CODE (expr) == COMPONENT_REF
 146        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 147       || TREE_CODE (expr) == BIT_FIELD_REF)
 148     {
 149       HOST_WIDE_INT bitpos, bitsize;
 150       base = TREE_OPERAND (expr, 0);
 151       if (TREE_CODE (expr) == COMPONENT_REF)
 152         {
 153           expr = TREE_OPERAND (expr, 1);
 154           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 155             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 156           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 157               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 158               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 159             return false;
 160           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 161                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 162           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 163         }
 164       else
 165         {
 166           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 167               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 168             return false;
 169           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 170           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 171         }
 172       if (bitpos < 0 || bitsize <= 0)
 173         return false;
 174       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 175              / BITS_PER_UNIT;
 176       if (may_be_nonaddressable_p (base))
 177         return false;
 178       align = get_object_alignment (base);
 179       if (align < BITS_PER_UNIT)
 180         return false;
 181       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 182       if ((align - 1) & bitpos)
 183         {
 184           align = (align - 1) & bitpos;
 185           align = least_bit_hwi (align);
 186         }
 187       expr = build_fold_addr_expr (unshare_expr (base));
 188       expr = build2 (MEM_REF, char_type_node, expr,
 189                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 190       expr_ptr = build_fold_addr_expr (expr);
 191     }
 192   else
 193     {
 194       if (may_be_nonaddressable_p (expr))
 195         return false;
 196       align = get_object_alignment (expr);
 197       if (align < BITS_PER_UNIT)
 198         return false;
 199       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 200     }
 201   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 202   if ((size & (size - 1)) != 0 || size > 16
 203       || align < MIN (size, 8) * BITS_PER_UNIT)
 204     {
 205       builtin_decl = builtin_decl_implicit (is_write
 206                                             ? BUILT_IN_TSAN_WRITE_RANGE
 207                                             : BUILT_IN_TSAN_READ_RANGE);
 208       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 209     }
 210   else if (rhs == NULL)
 211     g = gimple_build_call (get_memory_access_decl (is_write, size,
 212                                                    TREE_THIS_VOLATILE (expr)),
 213                            1, expr_ptr);
 214   else
 215     {
 216       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 217       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 218     }
 219   gimple_set_location (g, loc);
 220   gimple_seq_add_stmt_without_update (&seq, g);
 221   /* Instrumentation for assignment of a function result
 222      must be inserted after the call.  Instrumentation for
 223      reads of function arguments must be inserted before the call.
 224      That's because the call can contain synchronization.  */
 225   if (is_gimple_call (stmt) && is_write)
 226     {
 227       /* If the call can throw, it must be the last stmt in
 228          a basic block, so the instrumented stmts need to be
 229          inserted in successor bbs.  */
 230       if (is_ctrl_altering_stmt (stmt))
 231         {
 232           edge e;
 233
 234           bb = gsi_bb (gsi);
 235           e = find_fallthru_edge (bb->succs);
 236           if (e)
 237             gsi_insert_seq_on_edge_immediate (e, seq);
 238         }
 239       else
 240         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 241     }
 242   else
 243     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 244
 245   return true;
 246 }
 247
 248 /* Actions for sync/atomic builtin transformations.  */
 249 enum tsan_atomic_action
 250 {
 251   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 252   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst,
 253   bool_clear, bool_test_and_set
 254 };
 255
 256 /* Table how to map sync/atomic builtins to their corresponding
 257    tsan equivalents.  */
 258 static const struct tsan_map_atomic
 259 {
 260   enum built_in_function fcode, tsan_fcode;
 261   enum tsan_atomic_action action;
 262   enum tree_code code;
 263 } tsan_atomic_table[] =
 264 {
 265 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 266   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 267 #define CHECK_LAST(fcode, tsan_fcode) \
 268   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 269 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 270   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 271 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 272   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 273 #define WEAK_CAS(fcode, tsan_fcode) \
 274   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 275 #define STRONG_CAS(fcode, tsan_fcode) \
 276   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 277 #define BOOL_CAS(fcode, tsan_fcode) \
 278   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 279 #define VAL_CAS(fcode, tsan_fcode) \
 280   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 281 #define LOCK_RELEASE(fcode, tsan_fcode) \
 282   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 283 #define FETCH_OP(fcode, tsan_fcode, code) \
 284   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 285 #define FETCH_OPS(fcode, tsan_fcode, code) \
 286   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 287 #define BOOL_CLEAR(fcode, tsan_fcode) \
 288   TRANSFORM (fcode, tsan_fcode, bool_clear, ERROR_MARK)
 289 #define BOOL_TEST_AND_SET(fcode, tsan_fcode) \
 290   TRANSFORM (fcode, tsan_fcode, bool_test_and_set, ERROR_MARK)
 291
 292   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 293   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 294   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 295   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 296   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 297   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 298   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 299   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 300   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 301   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 302   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 303   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 304   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 305   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 306   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 307   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 308   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 309   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 310   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 311   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 312   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 313   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 314   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 315   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 316   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 317   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 318   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 319   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 320   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 321   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 322   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 323   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 324   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 325   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 326   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 327   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 328   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 329   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 330   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 331   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 332   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 333   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 334   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 335   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 336   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 337
 338   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 339   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 340
 341   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 342   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 343   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 344   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 345   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 346   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 347   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 348   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 349   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 350   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 351   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 352   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 353   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 354   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 355   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 356   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 357   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 358   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 359   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 360   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 361   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 362   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 363   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 364   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 365   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 366   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 367   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 368   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 369   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 370   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 371
 372   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 373   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 374   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 375   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 376   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 377
 378   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 379   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 380   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 381   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 382   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 383   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 384   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 385   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 386   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 387   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 388   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 389   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 390   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 391   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 392   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 393   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 394   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 395   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 396   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 397   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 398   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 399   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 400   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 401   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 402   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 403   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 404   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 405   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 406   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 407   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 408
 409   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 410
 411   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 412   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 413   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 414   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 415   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 416   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 417   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 418   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 419   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 420   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 421   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 422   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 423   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 424   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 425   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 426   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 427   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 428   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 429   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 430   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 431   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 432   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 433   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 434   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 435   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 436   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 437   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 438   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 439   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 440   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 441
 442   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 443   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 444   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 445   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 446   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 447
 448   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 449   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 450               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 451   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 452               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 453   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 454               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 455   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 456               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 457
 458   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 459             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 460   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 461             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 462   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 463             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 464   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 465             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 466   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 467             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 468
 469   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 470   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 471   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 472   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 473   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 474            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 475
 476   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 477   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 478   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 479   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 480   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE),
 481
 482   BOOL_CLEAR (ATOMIC_CLEAR, TSAN_ATOMIC8_STORE),
 483
 484   BOOL_TEST_AND_SET (ATOMIC_TEST_AND_SET, TSAN_ATOMIC8_EXCHANGE)
 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             maybe_clean_eh_stmt (stmt);
 517             if (tsan_atomic_table[i].action == fetch_op)
 518               {
 519                 args[1] = gimple_call_arg (stmt, 1);
 520                 goto adjust_result;
 521               }
 522             return;
 523           case add_seq_cst:
 524           case add_acquire:
 525           case fetch_op_seq_cst:
 526             gcc_assert (num <= 2);
 527             for (j = 0; j < num; j++)
 528               args[j] = gimple_call_arg (stmt, j);
 529             for (; j < 2; j++)
 530               args[j] = NULL_TREE;
 531             args[num] = build_int_cst (NULL_TREE,
 532                                        tsan_atomic_table[i].action
 533                                        != add_acquire
 534                                        ? MEMMODEL_SEQ_CST
 535                                        : MEMMODEL_ACQUIRE);
 536             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 537             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 538             stmt = gsi_stmt (*gsi);
 539             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 540               {
 541               adjust_result:
 542                 lhs = gimple_call_lhs (stmt);
 543                 if (lhs == NULL_TREE)
 544                   return;
 545                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 546                                                 TREE_TYPE (args[1])))
 547                   {
 548                     tree var = make_ssa_name (TREE_TYPE (lhs));
 549                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 550                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 551                     args[1] = var;
 552                   }
 553                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 554                 /* BIT_NOT_EXPR stands for NAND.  */
 555                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 556                   {
 557                     tree var = make_ssa_name (TREE_TYPE (lhs));
 558                     g = gimple_build_assign (var, BIT_AND_EXPR,
 559                                              gimple_call_lhs (stmt), args[1]);
 560                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 561                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 562                   }
 563                 else
 564                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 565                                            gimple_call_lhs (stmt), args[1]);
 566                 update_stmt (stmt);
 567                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 568               }
 569             return;
 570           case weak_cas:
 571             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 572               continue;
 573             /* FALLTHRU */
 574           case strong_cas:
 575             gcc_assert (num == 6);
 576             for (j = 0; j < 6; j++)
 577               args[j] = gimple_call_arg (stmt, j);
 578             if (tree_fits_uhwi_p (args[4])
 579                 && memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 580               return;
 581             if (tree_fits_uhwi_p (args[5])
 582                 && memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 583               return;
 584             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 585                                 args[4], args[5]);
 586             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 587             return;
 588           case bool_cas:
 589           case val_cas:
 590             gcc_assert (num == 3);
 591             for (j = 0; j < 3; j++)
 592               args[j] = gimple_call_arg (stmt, j);
 593             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 594             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 595             t = create_tmp_var (t);
 596             mark_addressable (t);
 597             if (!useless_type_conversion_p (TREE_TYPE (t),
 598                                             TREE_TYPE (args[1])))
 599               {
 600                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 601                                          NOP_EXPR, args[1]);
 602                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 603                 args[1] = gimple_assign_lhs (g);
 604               }
 605             g = gimple_build_assign (t, args[1]);
 606             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 607             lhs = gimple_call_lhs (stmt);
 608             update_gimple_call (gsi, decl, 5, args[0],
 609                                 build_fold_addr_expr (t), args[2],
 610                                 build_int_cst (NULL_TREE,
 611                                                MEMMODEL_SEQ_CST),
 612                                 build_int_cst (NULL_TREE,
 613                                                MEMMODEL_SEQ_CST));
 614             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 615             if (tsan_atomic_table[i].action == val_cas && lhs)
 616               {
 617                 tree cond;
 618                 stmt = gsi_stmt (*gsi);
 619                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 620                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 621                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 622                 cond = build2 (NE_EXPR, boolean_type_node, t,
 623                                build_int_cst (TREE_TYPE (t), 0));
 624                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 625                                          gimple_assign_lhs (g));
 626                 gimple_call_set_lhs (stmt, t);
 627                 update_stmt (stmt);
 628                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 629               }
 630             return;
 631           case lock_release:
 632             gcc_assert (num == 1);
 633             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 634             t = TREE_VALUE (TREE_CHAIN (t));
 635             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 636                                 build_int_cst (t, 0),
 637                                 build_int_cst (NULL_TREE,
 638                                                MEMMODEL_RELEASE));
 639             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 640             return;
 641           case bool_clear:
 642           case bool_test_and_set:
 643             if (BOOL_TYPE_SIZE != 8)
 644               {
 645                 decl = NULL_TREE;
 646                 for (j = 1; j < 5; j++)
 647                   if (BOOL_TYPE_SIZE == (8 << j))
 648                     {
 649                       enum built_in_function tsan_fcode
 650                         = (enum built_in_function)
 651                           (tsan_atomic_table[i].tsan_fcode + j);
 652                       decl = builtin_decl_implicit (tsan_fcode);
 653                       break;
 654                     }
 655                 if (decl == NULL_TREE)
 656                   return;
 657               }
 658             last_arg = gimple_call_arg (stmt, num - 1);
 659             if (tree_fits_uhwi_p (last_arg)
 660                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 661               return;
 662             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 663             t = TREE_VALUE (TREE_CHAIN (t));
 664             if (tsan_atomic_table[i].action == bool_clear)
 665               {
 666                 update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 667                                     build_int_cst (t, 0), last_arg);
 668                 maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 669                 return;
 670               }
 671             t = build_int_cst (t, targetm.atomic_test_and_set_trueval);
 672             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 673                                 t, last_arg);
 674             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 675             stmt = gsi_stmt (*gsi);
 676             lhs = gimple_call_lhs (stmt);
 677             if (lhs == NULL_TREE)
 678               return;
 679             if (targetm.atomic_test_and_set_trueval != 1
 680                 || !useless_type_conversion_p (TREE_TYPE (lhs),
 681                                                TREE_TYPE (t)))
 682               {
 683                 tree new_lhs = make_ssa_name (TREE_TYPE (t));
 684                 gimple_call_set_lhs (stmt, new_lhs);
 685                 if (targetm.atomic_test_and_set_trueval != 1)
 686                   g = gimple_build_assign (lhs, NE_EXPR, new_lhs,
 687                                            build_int_cst (TREE_TYPE (t), 0));
 688                 else
 689                   g = gimple_build_assign (lhs, NOP_EXPR, new_lhs);
 690                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 691                 update_stmt (stmt);
 692               }
 693             return;
 694           default:
 695             continue;
 696           }
 697       }
 698 }
 699
 700 /* Instruments the gimple pointed to by GSI. Return
 701    true if func entry/exit should be instrumented.  */
 702
 703 static bool
 704 instrument_gimple (gimple_stmt_iterator *gsi)
 705 {
 706   gimple *stmt;
 707   tree rhs, lhs;
 708   bool instrumented = false;
 709
 710   stmt = gsi_stmt (*gsi);
 711   if (is_gimple_call (stmt)
 712       && (gimple_call_fndecl (stmt)
 713           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 714     {
 715       /* All functions with function call will have exit instrumented,
 716          therefore no function calls other than __tsan_func_exit
 717          shall appear in the functions.  */
 718       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 719       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 720         instrument_builtin_call (gsi);
 721       return true;
 722     }
 723   else if (is_gimple_assign (stmt)
 724            && !gimple_clobber_p (stmt))
 725     {
 726       if (gimple_store_p (stmt))
 727         {
 728           lhs = gimple_assign_lhs (stmt);
 729           instrumented = instrument_expr (*gsi, lhs, true);
 730         }
 731       if (gimple_assign_load_p (stmt))
 732         {
 733           rhs = gimple_assign_rhs1 (stmt);
 734           instrumented = instrument_expr (*gsi, rhs, false);
 735         }
 736     }
 737   return instrumented;
 738 }
 739
 740 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 741
 742 static void
 743 replace_func_exit (gimple *stmt)
 744 {
 745   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 746   gimple *g = gimple_build_call (builtin_decl, 0);
 747   gimple_set_location (g, cfun->function_end_locus);
 748   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 749   gsi_replace (&gsi, g, true);
 750 }
 751
 752 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 753
 754 static void
 755 instrument_func_exit (void)
 756 {
 757   location_t loc;
 758   basic_block exit_bb;
 759   gimple_stmt_iterator gsi;
 760   gimple *stmt, *g;
 761   tree builtin_decl;
 762   edge e;
 763   edge_iterator ei;
 764
 765   /* Find all function exits.  */
 766   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 767   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 768     {
 769       gsi = gsi_last_bb (e->src);
 770       stmt = gsi_stmt (gsi);
 771       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 772                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 773       loc = gimple_location (stmt);
 774       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 775       g = gimple_build_call (builtin_decl, 0);
 776       gimple_set_location (g, loc);
 777       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 778     }
 779 }
 780
 781 /* Instruments all interesting memory accesses in the current function.
 782    Return true if func entry/exit should be instrumented.  */
 783
 784 static bool
 785 instrument_memory_accesses (bool *cfg_changed)
 786 {
 787   basic_block bb;
 788   gimple_stmt_iterator gsi;
 789   bool fentry_exit_instrument = false;
 790   bool func_exit_seen = false;
 791   auto_vec<gimple *> tsan_func_exits;
 792
 793   FOR_EACH_BB_FN (bb, cfun)
 794     {
 795       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 796         {
 797           gimple *stmt = gsi_stmt (gsi);
 798           if (gimple_call_internal_p (stmt, IFN_TSAN_FUNC_EXIT))
 799             {
 800               if (fentry_exit_instrument)
 801                 replace_func_exit (stmt);
 802               else
 803                 tsan_func_exits.safe_push (stmt);
 804               func_exit_seen = true;
 805             }
 806           else
 807             fentry_exit_instrument |= instrument_gimple (&gsi);
 808         }
 809       if (gimple_purge_dead_eh_edges (bb))
 810         *cfg_changed = true;
 811     }
 812   unsigned int i;
 813   gimple *stmt;
 814   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 815     if (fentry_exit_instrument)
 816       replace_func_exit (stmt);
 817     else
 818       {
 819         gsi = gsi_for_stmt (stmt);
 820         gsi_remove (&gsi, true);
 821       }
 822   if (fentry_exit_instrument && !func_exit_seen)
 823     instrument_func_exit ();
 824   return fentry_exit_instrument;
 825 }
 826
 827 /* Instruments function entry.  */
 828
 829 static void
 830 instrument_func_entry (void)
 831 {
 832   tree ret_addr, builtin_decl;
 833   gimple *g;
 834   gimple_seq seq = NULL;
 835
 836   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 837   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 838   ret_addr = make_ssa_name (ptr_type_node);
 839   gimple_call_set_lhs (g, ret_addr);
 840   gimple_set_location (g, cfun->function_start_locus);
 841   gimple_seq_add_stmt_without_update (&seq, g);
 842
 843   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 844   g = gimple_build_call (builtin_decl, 1, ret_addr);
 845   gimple_set_location (g, cfun->function_start_locus);
 846   gimple_seq_add_stmt_without_update (&seq, g);
 847
 848   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 849   gsi_insert_seq_on_edge_immediate (e, seq);
 850 }
 851
 852 /* ThreadSanitizer instrumentation pass.  */
 853
 854 static unsigned
 855 tsan_pass (void)
 856 {
 857   initialize_sanitizer_builtins ();
 858   bool cfg_changed = false;
 859   if (instrument_memory_accesses (&cfg_changed))
 860     instrument_func_entry ();
 861   return cfg_changed ? TODO_cleanup_cfg : 0;
 862 }
 863
 864 /* Inserts __tsan_init () into the list of CTORs.  */
 865
 866 void
 867 tsan_finish_file (void)
 868 {
 869   tree ctor_statements = NULL_TREE;
 870
 871   initialize_sanitizer_builtins ();
 872   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 873   append_to_statement_list (build_call_expr (init_decl, 0),
 874                             &ctor_statements);
 875   cgraph_build_static_cdtor ('I', ctor_statements,
 876                              MAX_RESERVED_INIT_PRIORITY - 1);
 877 }
 878
 879 /* The pass descriptor.  */
 880
 881 namespace {
 882
 883 const pass_data pass_data_tsan =
 884 {
 885   GIMPLE_PASS, /* type */
 886   "tsan", /* name */
 887   OPTGROUP_NONE, /* optinfo_flags */
 888   TV_NONE, /* tv_id */
 889   ( PROP_ssa | PROP_cfg ), /* properties_required */
 890   0, /* properties_provided */
 891   0, /* properties_destroyed */
 892   0, /* todo_flags_start */
 893   TODO_update_ssa, /* todo_flags_finish */
 894 };
 895
 896 class pass_tsan : public gimple_opt_pass
 897 {
 898 public:
 899   pass_tsan (gcc::context *ctxt)
 900     : gimple_opt_pass (pass_data_tsan, ctxt)
 901   {}
 902
 903   /* opt_pass methods: */
 904   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 905   virtual bool gate (function *)
 906 {
 907   return sanitize_flags_p (SANITIZE_THREAD);
 908 }
 909
 910   virtual unsigned int execute (function *) { return tsan_pass (); }
 911
 912 }; // class pass_tsan
 913
 914 } // anon namespace
 915
 916 gimple_opt_pass *
 917 make_pass_tsan (gcc::context *ctxt)
 918 {
 919   return new pass_tsan (ctxt);
 920 }
 921
 922 namespace {
 923
 924 const pass_data pass_data_tsan_O0 =
 925 {
 926   GIMPLE_PASS, /* type */
 927   "tsan0", /* name */
 928   OPTGROUP_NONE, /* optinfo_flags */
 929   TV_NONE, /* tv_id */
 930   ( PROP_ssa | PROP_cfg ), /* properties_required */
 931   0, /* properties_provided */
 932   0, /* properties_destroyed */
 933   0, /* todo_flags_start */
 934   TODO_update_ssa, /* todo_flags_finish */
 935 };
 936
 937 class pass_tsan_O0 : public gimple_opt_pass
 938 {
 939 public:
 940   pass_tsan_O0 (gcc::context *ctxt)
 941     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 942   {}
 943
 944   /* opt_pass methods: */
 945   virtual bool gate (function *)
 946     {
 947       return (sanitize_flags_p (SANITIZE_THREAD) && !optimize);
 948     }
 949
 950   virtual unsigned int execute (function *) { return tsan_pass (); }
 951
 952 }; // class pass_tsan_O0
 953
 954 } // anon namespace
 955
 956 gimple_opt_pass *
 957 make_pass_tsan_O0 (gcc::context *ctxt)
 958 {
 959   return new pass_tsan_O0 (ctxt);
 960 }