gcc/tsan.cc

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2023 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 "gimple-fold.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 #include "diagnostic-core.h"
  49
  50 /* Number of instrumented memory accesses in the current function.  */
  51
  52 /* Builds the following decl
  53    void __tsan_read/writeX (void *addr);  */
  54
  55 static tree
  56 get_memory_access_decl (bool is_write, unsigned size, bool volatilep)
  57 {
  58   enum built_in_function fcode;
  59   int pos;
  60
  61   if (size <= 1)
  62     pos = 0;
  63   else if (size <= 3)
  64     pos = 1;
  65   else if (size <= 7)
  66     pos = 2;
  67   else if (size <= 15)
  68     pos = 3;
  69   else
  70     pos = 4;
  71
  72   if (param_tsan_distinguish_volatile && volatilep)
  73     fcode = is_write ? BUILT_IN_TSAN_VOLATILE_WRITE1
  74                      : BUILT_IN_TSAN_VOLATILE_READ1;
  75   else
  76     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  77                      : BUILT_IN_TSAN_READ1;
  78   fcode = (built_in_function)(fcode + pos);
  79
  80   return builtin_decl_implicit (fcode);
  81 }
  82
  83 /* Check as to whether EXPR refers to a store to vptr.  */
  84
  85 static tree
  86 is_vptr_store (gimple *stmt, tree expr, bool is_write)
  87 {
  88   if (is_write == true
  89       && gimple_assign_single_p (stmt)
  90       && TREE_CODE (expr) == COMPONENT_REF)
  91     {
  92       tree field = TREE_OPERAND (expr, 1);
  93       if (TREE_CODE (field) == FIELD_DECL
  94           && DECL_VIRTUAL_P (field))
  95         return gimple_assign_rhs1 (stmt);
  96     }
  97   return NULL;
  98 }
  99
 100 /* Instruments EXPR if needed. If any instrumentation is inserted,
 101    return true.  */
 102
 103 static bool
 104 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 105 {
 106   tree base, rhs, expr_ptr, builtin_decl;
 107   basic_block bb;
 108   HOST_WIDE_INT size;
 109   gimple *stmt, *g;
 110   gimple_seq seq;
 111   location_t loc;
 112   unsigned int align;
 113
 114   size = int_size_in_bytes (TREE_TYPE (expr));
 115   if (size <= 0)
 116     return false;
 117
 118   poly_int64 unused_bitsize, unused_bitpos;
 119   tree offset;
 120   machine_mode mode;
 121   int unsignedp, reversep, volatilep = 0;
 122   base = get_inner_reference (expr, &unused_bitsize, &unused_bitpos, &offset,
 123                               &mode, &unsignedp, &reversep, &volatilep);
 124
 125   /* No need to instrument accesses to decls that don't escape,
 126      they can't escape to other threads then.  */
 127   if (DECL_P (base) && !is_global_var (base))
 128     {
 129       struct pt_solution pt;
 130       memset (&pt, 0, sizeof (pt));
 131       pt.escaped = 1;
 132       pt.ipa_escaped = flag_ipa_pta != 0;
 133       if (!pt_solution_includes (&pt, base))
 134         return false;
 135       if (!may_be_aliased (base))
 136         return false;
 137     }
 138
 139   if (TREE_READONLY (base) || (VAR_P (base) && DECL_HARD_REGISTER (base)))
 140     return false;
 141
 142   stmt = gsi_stmt (gsi);
 143   loc = gimple_location (stmt);
 144   rhs = is_vptr_store (stmt, expr, is_write);
 145
 146   if ((TREE_CODE (expr) == COMPONENT_REF
 147        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 148       || TREE_CODE (expr) == BIT_FIELD_REF)
 149     {
 150       HOST_WIDE_INT bitpos, bitsize;
 151       base = TREE_OPERAND (expr, 0);
 152       if (TREE_CODE (expr) == COMPONENT_REF)
 153         {
 154           expr = TREE_OPERAND (expr, 1);
 155           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 156             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 157           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 158               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 159               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 160             return false;
 161           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 162                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 163           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 164         }
 165       else
 166         {
 167           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 168               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 169             return false;
 170           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 171           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 172         }
 173       if (bitpos < 0 || bitsize <= 0)
 174         return false;
 175       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 176              / BITS_PER_UNIT;
 177       if (may_be_nonaddressable_p (base))
 178         return false;
 179       align = get_object_alignment (base);
 180       if (align < BITS_PER_UNIT)
 181         return false;
 182       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 183       if ((align - 1) & bitpos)
 184         {
 185           align = (align - 1) & bitpos;
 186           align = least_bit_hwi (align);
 187         }
 188       expr = build_fold_addr_expr (unshare_expr (base));
 189       expr = build2 (MEM_REF, char_type_node, expr,
 190                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 191       expr_ptr = build_fold_addr_expr (expr);
 192     }
 193   else
 194     {
 195       if (may_be_nonaddressable_p (expr))
 196         return false;
 197       align = get_object_alignment (expr);
 198       if (align < BITS_PER_UNIT)
 199         return false;
 200       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 201     }
 202   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 203   if ((size & (size - 1)) != 0 || size > 16
 204       || align < MIN (size, 8) * BITS_PER_UNIT)
 205     {
 206       builtin_decl = builtin_decl_implicit (is_write
 207                                             ? BUILT_IN_TSAN_WRITE_RANGE
 208                                             : BUILT_IN_TSAN_READ_RANGE);
 209       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 210     }
 211   else if (rhs == NULL)
 212     g = gimple_build_call (get_memory_access_decl (is_write, size,
 213                                                    TREE_THIS_VOLATILE (expr)),
 214                            1, expr_ptr);
 215   else
 216     {
 217       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 218       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 219     }
 220   gimple_set_location (g, loc);
 221   gimple_seq_add_stmt_without_update (&seq, g);
 222   /* Instrumentation for assignment of a function result
 223      must be inserted after the call.  Instrumentation for
 224      reads of function arguments must be inserted before the call.
 225      That's because the call can contain synchronization.  */
 226   if (is_gimple_call (stmt) && is_write)
 227     {
 228       /* If the call can throw, it must be the last stmt in
 229          a basic block, so the instrumented stmts need to be
 230          inserted in successor bbs.  */
 231       if (is_ctrl_altering_stmt (stmt))
 232         {
 233           edge e;
 234
 235           bb = gsi_bb (gsi);
 236           e = find_fallthru_edge (bb->succs);
 237           if (e)
 238             gsi_insert_seq_on_edge_immediate (e, seq);
 239         }
 240       else
 241         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 242     }
 243   else
 244     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 245
 246   return true;
 247 }
 248
 249 /* Actions for sync/atomic builtin transformations.  */
 250 enum tsan_atomic_action
 251 {
 252   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 253   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst,
 254   bool_clear, bool_test_and_set
 255 };
 256
 257 /* Table how to map sync/atomic builtins to their corresponding
 258    tsan equivalents.  */
 259 static const struct tsan_map_atomic
 260 {
 261   enum built_in_function fcode, tsan_fcode;
 262   enum tsan_atomic_action action;
 263   enum tree_code code;
 264 } tsan_atomic_table[] =
 265 {
 266 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 267   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 268 #define CHECK_LAST(fcode, tsan_fcode) \
 269   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 270 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 271   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 272 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 273   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 274 #define WEAK_CAS(fcode, tsan_fcode) \
 275   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 276 #define STRONG_CAS(fcode, tsan_fcode) \
 277   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 278 #define BOOL_CAS(fcode, tsan_fcode) \
 279   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 280 #define VAL_CAS(fcode, tsan_fcode) \
 281   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 282 #define LOCK_RELEASE(fcode, tsan_fcode) \
 283   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 284 #define FETCH_OP(fcode, tsan_fcode, code) \
 285   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 286 #define FETCH_OPS(fcode, tsan_fcode, code) \
 287   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 288 #define BOOL_CLEAR(fcode, tsan_fcode) \
 289   TRANSFORM (fcode, tsan_fcode, bool_clear, ERROR_MARK)
 290 #define BOOL_TEST_AND_SET(fcode, tsan_fcode) \
 291   TRANSFORM (fcode, tsan_fcode, bool_test_and_set, ERROR_MARK)
 292
 293   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 294   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 295   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 296   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 297   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 298   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 299   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 300   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 301   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 302   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 303   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 304   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 305   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 306   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 307   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 308   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 309   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 310   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 311   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 312   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 313   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 314   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 315   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 316   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 317   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 318   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 319   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 320   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 321   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 322   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 323   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 324   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 325   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 326   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 327   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 328   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 329   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 330   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 331   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 332   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 333   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 334   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 335   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 336   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 337   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 338
 339   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 340   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 341
 342   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 343   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 344   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 345   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 346   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 347   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 348   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 349   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 350   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 351   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 352   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 353   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 354   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 355   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 356   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 357   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 358   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 359   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 360   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 361   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 362   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 363   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 364   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 365   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 366   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 367   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 368   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 369   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 370   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 371   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 372
 373   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 374   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 375   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 376   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 377   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 378
 379   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 380   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 381   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 382   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 383   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 384   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 385   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 386   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 387   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 388   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 389   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 390   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 391   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 392   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 393   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 394   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 395   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 396   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 397   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 398   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 399   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 400   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 401   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 402   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 403   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 404   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 405   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 406   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 407   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 408   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 409
 410   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 411
 412   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 413   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 414   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 415   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 416   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 417   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 418   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 419   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 420   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 421   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 422   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 423   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 424   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 425   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 426   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 427   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 428   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 429   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 430   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 431   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 432   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 433   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 434   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 435   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 436   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 437   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 438   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 439   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 440   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 441   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 442
 443   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 444   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 445   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 446   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 447   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 448
 449   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 450   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 451               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 452   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 453               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 454   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 455               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 456   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 457               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 458
 459   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 460             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 461   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 462             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 463   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 464             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 465   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 466             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 467   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 468             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 469
 470   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 471   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 472   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 473   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 474   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 475            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 476
 477   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 478   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 479   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 480   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 481   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE),
 482
 483   BOOL_CLEAR (ATOMIC_CLEAR, TSAN_ATOMIC8_STORE),
 484
 485   BOOL_TEST_AND_SET (ATOMIC_TEST_AND_SET, TSAN_ATOMIC8_EXCHANGE)
 486 };
 487
 488 /* Instrument an atomic builtin.  */
 489
 490 static void
 491 instrument_builtin_call (gimple_stmt_iterator *gsi)
 492 {
 493   gimple *stmt = gsi_stmt (*gsi), *g;
 494   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 495   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 496   unsigned int i, num = gimple_call_num_args (stmt), j;
 497   for (j = 0; j < 6 && j < num; j++)
 498     args[j] = gimple_call_arg (stmt, j);
 499   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 500     if (fcode != tsan_atomic_table[i].fcode)
 501       continue;
 502     else
 503       {
 504         if (fcode == BUILT_IN_ATOMIC_THREAD_FENCE)
 505           warning_at (gimple_location (stmt), OPT_Wtsan,
 506                       "%qs is not supported with %qs", "atomic_thread_fence",
 507                       "-fsanitize=thread");
 508
 509         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 510         if (decl == NULL_TREE)
 511           return;
 512         switch (tsan_atomic_table[i].action)
 513           {
 514           case check_last:
 515           case fetch_op:
 516             last_arg = gimple_call_arg (stmt, num - 1);
 517             if (tree_fits_uhwi_p (last_arg)
 518                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 519               return;
 520             gimple_call_set_fndecl (stmt, decl);
 521             update_stmt (stmt);
 522             maybe_clean_eh_stmt (stmt);
 523             if (tsan_atomic_table[i].action == fetch_op)
 524               {
 525                 args[1] = gimple_call_arg (stmt, 1);
 526                 goto adjust_result;
 527               }
 528             return;
 529           case add_seq_cst:
 530           case add_acquire:
 531           case fetch_op_seq_cst:
 532             gcc_assert (num <= 2);
 533             for (j = 0; j < num; j++)
 534               args[j] = gimple_call_arg (stmt, j);
 535             for (; j < 2; j++)
 536               args[j] = NULL_TREE;
 537             args[num] = build_int_cst (NULL_TREE,
 538                                        tsan_atomic_table[i].action
 539                                        != add_acquire
 540                                        ? MEMMODEL_SEQ_CST
 541                                        : MEMMODEL_ACQUIRE);
 542             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 543             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 544             stmt = gsi_stmt (*gsi);
 545             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 546               {
 547               adjust_result:
 548                 lhs = gimple_call_lhs (stmt);
 549                 if (lhs == NULL_TREE)
 550                   return;
 551                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 552                                                 TREE_TYPE (args[1])))
 553                   {
 554                     tree var = make_ssa_name (TREE_TYPE (lhs));
 555                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 556                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 557                     args[1] = var;
 558                   }
 559                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 560                 /* BIT_NOT_EXPR stands for NAND.  */
 561                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 562                   {
 563                     tree var = make_ssa_name (TREE_TYPE (lhs));
 564                     g = gimple_build_assign (var, BIT_AND_EXPR,
 565                                              gimple_call_lhs (stmt), args[1]);
 566                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 567                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 568                   }
 569                 else
 570                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 571                                            gimple_call_lhs (stmt), args[1]);
 572                 update_stmt (stmt);
 573                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 574               }
 575             return;
 576           case weak_cas:
 577             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 578               continue;
 579             /* FALLTHRU */
 580           case strong_cas:
 581             gcc_assert (num == 6);
 582             for (j = 0; j < 6; j++)
 583               args[j] = gimple_call_arg (stmt, j);
 584             if (tree_fits_uhwi_p (args[4])
 585                 && memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 586               return;
 587             if (tree_fits_uhwi_p (args[5])
 588                 && memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 589               return;
 590             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 591                                 args[4], args[5]);
 592             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 593             return;
 594           case bool_cas:
 595           case val_cas:
 596             gcc_assert (num == 3);
 597             for (j = 0; j < 3; j++)
 598               args[j] = gimple_call_arg (stmt, j);
 599             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 600             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 601             t = create_tmp_var (t);
 602             mark_addressable (t);
 603             if (!useless_type_conversion_p (TREE_TYPE (t),
 604                                             TREE_TYPE (args[1])))
 605               {
 606                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 607                                          NOP_EXPR, args[1]);
 608                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 609                 args[1] = gimple_assign_lhs (g);
 610               }
 611             g = gimple_build_assign (t, args[1]);
 612             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 613             lhs = gimple_call_lhs (stmt);
 614             update_gimple_call (gsi, decl, 5, args[0],
 615                                 build_fold_addr_expr (t), args[2],
 616                                 build_int_cst (NULL_TREE,
 617                                                MEMMODEL_SEQ_CST),
 618                                 build_int_cst (NULL_TREE,
 619                                                MEMMODEL_SEQ_CST));
 620             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 621             if (tsan_atomic_table[i].action == val_cas && lhs)
 622               {
 623                 stmt = gsi_stmt (*gsi);
 624                 tree t2 = make_ssa_name (TREE_TYPE (t));
 625                 g = gimple_build_assign (t2, t);
 626                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 627                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 628                 tree cond = make_ssa_name (boolean_type_node);
 629                 g = gimple_build_assign (cond, NE_EXPR,
 630                                          t, build_zero_cst (TREE_TYPE (t)));
 631                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 632                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1], t2);
 633                 gimple_call_set_lhs (stmt, t);
 634                 update_stmt (stmt);
 635                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 636               }
 637             return;
 638           case lock_release:
 639             gcc_assert (num == 1);
 640             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 641             t = TREE_VALUE (TREE_CHAIN (t));
 642             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 643                                 build_int_cst (t, 0),
 644                                 build_int_cst (NULL_TREE,
 645                                                MEMMODEL_RELEASE));
 646             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 647             return;
 648           case bool_clear:
 649           case bool_test_and_set:
 650             if (BOOL_TYPE_SIZE != 8)
 651               {
 652                 decl = NULL_TREE;
 653                 for (j = 1; j < 5; j++)
 654                   if (BOOL_TYPE_SIZE == (8 << j))
 655                     {
 656                       enum built_in_function tsan_fcode
 657                         = (enum built_in_function)
 658                           (tsan_atomic_table[i].tsan_fcode + j);
 659                       decl = builtin_decl_implicit (tsan_fcode);
 660                       break;
 661                     }
 662                 if (decl == NULL_TREE)
 663                   return;
 664               }
 665             last_arg = gimple_call_arg (stmt, num - 1);
 666             if (tree_fits_uhwi_p (last_arg)
 667                 && memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 668               return;
 669             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 670             t = TREE_VALUE (TREE_CHAIN (t));
 671             if (tsan_atomic_table[i].action == bool_clear)
 672               {
 673                 update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 674                                     build_int_cst (t, 0), last_arg);
 675                 maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 676                 return;
 677               }
 678             t = build_int_cst (t, targetm.atomic_test_and_set_trueval);
 679             update_gimple_call (gsi, decl, 3, gimple_call_arg (stmt, 0),
 680                                 t, last_arg);
 681             maybe_clean_or_replace_eh_stmt (stmt, gsi_stmt (*gsi));
 682             stmt = gsi_stmt (*gsi);
 683             lhs = gimple_call_lhs (stmt);
 684             if (lhs == NULL_TREE)
 685               return;
 686             if (targetm.atomic_test_and_set_trueval != 1
 687                 || !useless_type_conversion_p (TREE_TYPE (lhs),
 688                                                TREE_TYPE (t)))
 689               {
 690                 tree new_lhs = make_ssa_name (TREE_TYPE (t));
 691                 gimple_call_set_lhs (stmt, new_lhs);
 692                 if (targetm.atomic_test_and_set_trueval != 1)
 693                   g = gimple_build_assign (lhs, NE_EXPR, new_lhs,
 694                                            build_int_cst (TREE_TYPE (t), 0));
 695                 else
 696                   g = gimple_build_assign (lhs, NOP_EXPR, new_lhs);
 697                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 698                 update_stmt (stmt);
 699               }
 700             return;
 701           default:
 702             continue;
 703           }
 704       }
 705 }
 706
 707 /* Instruments the gimple pointed to by GSI. Return
 708    true if func entry/exit should be instrumented.  */
 709
 710 static bool
 711 instrument_gimple (gimple_stmt_iterator *gsi)
 712 {
 713   gimple *stmt;
 714   tree rhs, lhs;
 715   bool instrumented = false;
 716
 717   stmt = gsi_stmt (*gsi);
 718   if (is_gimple_call (stmt)
 719       && (gimple_call_fndecl (stmt)
 720           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 721     {
 722       /* All functions with function call will have exit instrumented,
 723          therefore no function calls other than __tsan_func_exit
 724          shall appear in the functions.  */
 725       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 726       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 727         instrument_builtin_call (gsi);
 728       return true;
 729     }
 730   else if (is_gimple_assign (stmt)
 731            && !gimple_clobber_p (stmt))
 732     {
 733       if (gimple_store_p (stmt))
 734         {
 735           lhs = gimple_assign_lhs (stmt);
 736           instrumented = instrument_expr (*gsi, lhs, true);
 737         }
 738       if (gimple_assign_load_p (stmt))
 739         {
 740           rhs = gimple_assign_rhs1 (stmt);
 741           instrumented = instrument_expr (*gsi, rhs, false);
 742         }
 743     }
 744   return instrumented;
 745 }
 746
 747 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 748
 749 static void
 750 replace_func_exit (gimple *stmt)
 751 {
 752   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 753   gimple *g = gimple_build_call (builtin_decl, 0);
 754   gimple_set_location (g, cfun->function_end_locus);
 755   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 756   gsi_replace (&gsi, g, true);
 757 }
 758
 759 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 760
 761 static void
 762 instrument_func_exit (void)
 763 {
 764   location_t loc;
 765   basic_block exit_bb;
 766   gimple_stmt_iterator gsi;
 767   gimple *stmt, *g;
 768   tree builtin_decl;
 769   edge e;
 770   edge_iterator ei;
 771
 772   /* Find all function exits.  */
 773   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 774   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 775     {
 776       gsi = gsi_last_bb (e->src);
 777       stmt = gsi_stmt (gsi);
 778       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 779                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 780       loc = gimple_location (stmt);
 781       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 782       g = gimple_build_call (builtin_decl, 0);
 783       gimple_set_location (g, loc);
 784       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 785     }
 786 }
 787
 788 /* Instruments all interesting memory accesses in the current function.
 789    Return true if func entry/exit should be instrumented.  */
 790
 791 static bool
 792 instrument_memory_accesses (bool *cfg_changed)
 793 {
 794   basic_block bb;
 795   gimple_stmt_iterator gsi;
 796   bool fentry_exit_instrument = false;
 797   bool func_exit_seen = false;
 798   auto_vec<gimple *> tsan_func_exits;
 799
 800   FOR_EACH_BB_FN (bb, cfun)
 801     {
 802       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 803         {
 804           gimple *stmt = gsi_stmt (gsi);
 805           if (gimple_call_internal_p (stmt, IFN_TSAN_FUNC_EXIT))
 806             {
 807               if (fentry_exit_instrument)
 808                 replace_func_exit (stmt);
 809               else
 810                 tsan_func_exits.safe_push (stmt);
 811               func_exit_seen = true;
 812             }
 813           else
 814             fentry_exit_instrument
 815               |= (instrument_gimple (&gsi)
 816                   && param_tsan_instrument_func_entry_exit);
 817         }
 818       if (gimple_purge_dead_eh_edges (bb))
 819         *cfg_changed = true;
 820     }
 821   unsigned int i;
 822   gimple *stmt;
 823   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 824     if (fentry_exit_instrument)
 825       replace_func_exit (stmt);
 826     else
 827       {
 828         gsi = gsi_for_stmt (stmt);
 829         gsi_remove (&gsi, true);
 830       }
 831   if (fentry_exit_instrument && !func_exit_seen)
 832     instrument_func_exit ();
 833   return fentry_exit_instrument;
 834 }
 835
 836 /* Instruments function entry.  */
 837
 838 static void
 839 instrument_func_entry (void)
 840 {
 841   tree ret_addr, builtin_decl;
 842   gimple *g;
 843   gimple_seq seq = NULL;
 844
 845   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 846   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 847   ret_addr = make_ssa_name (ptr_type_node);
 848   gimple_call_set_lhs (g, ret_addr);
 849   gimple_set_location (g, cfun->function_start_locus);
 850   gimple_seq_add_stmt_without_update (&seq, g);
 851
 852   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 853   g = gimple_build_call (builtin_decl, 1, ret_addr);
 854   gimple_set_location (g, cfun->function_start_locus);
 855   gimple_seq_add_stmt_without_update (&seq, g);
 856
 857   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 858   gsi_insert_seq_on_edge_immediate (e, seq);
 859 }
 860
 861 /* ThreadSanitizer instrumentation pass.  */
 862
 863 static unsigned
 864 tsan_pass (void)
 865 {
 866   initialize_sanitizer_builtins ();
 867   bool cfg_changed = false;
 868   if (instrument_memory_accesses (&cfg_changed))
 869     instrument_func_entry ();
 870   return cfg_changed ? TODO_cleanup_cfg : 0;
 871 }
 872
 873 /* Inserts __tsan_init () into the list of CTORs.  */
 874
 875 void
 876 tsan_finish_file (void)
 877 {
 878   tree ctor_statements = NULL_TREE;
 879
 880   initialize_sanitizer_builtins ();
 881   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 882   append_to_statement_list (build_call_expr (init_decl, 0),
 883                             &ctor_statements);
 884   cgraph_build_static_cdtor ('I', ctor_statements,
 885                              MAX_RESERVED_INIT_PRIORITY - 1);
 886 }
 887
 888 /* The pass descriptor.  */
 889
 890 namespace {
 891
 892 const pass_data pass_data_tsan =
 893 {
 894   GIMPLE_PASS, /* type */
 895   "tsan", /* name */
 896   OPTGROUP_NONE, /* optinfo_flags */
 897   TV_NONE, /* tv_id */
 898   ( PROP_ssa | PROP_cfg ), /* properties_required */
 899   0, /* properties_provided */
 900   0, /* properties_destroyed */
 901   0, /* todo_flags_start */
 902   TODO_update_ssa, /* todo_flags_finish */
 903 };
 904
 905 class pass_tsan : public gimple_opt_pass
 906 {
 907 public:
 908   pass_tsan (gcc::context *ctxt)
 909     : gimple_opt_pass (pass_data_tsan, ctxt)
 910   {}
 911
 912   /* opt_pass methods: */
 913   opt_pass * clone () final override { return new pass_tsan (m_ctxt); }
 914   bool gate (function *) final override
 915 {
 916   return sanitize_flags_p (SANITIZE_THREAD);
 917 }
 918
 919   unsigned int execute (function *) final override { return tsan_pass (); }
 920
 921 }; // class pass_tsan
 922
 923 } // anon namespace
 924
 925 gimple_opt_pass *
 926 make_pass_tsan (gcc::context *ctxt)
 927 {
 928   return new pass_tsan (ctxt);
 929 }
 930
 931 namespace {
 932
 933 const pass_data pass_data_tsan_O0 =
 934 {
 935   GIMPLE_PASS, /* type */
 936   "tsan0", /* name */
 937   OPTGROUP_NONE, /* optinfo_flags */
 938   TV_NONE, /* tv_id */
 939   ( PROP_ssa | PROP_cfg ), /* properties_required */
 940   0, /* properties_provided */
 941   0, /* properties_destroyed */
 942   0, /* todo_flags_start */
 943   TODO_update_ssa, /* todo_flags_finish */
 944 };
 945
 946 class pass_tsan_O0 : public gimple_opt_pass
 947 {
 948 public:
 949   pass_tsan_O0 (gcc::context *ctxt)
 950     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 951   {}
 952
 953   /* opt_pass methods: */
 954   bool gate (function *) final override
 955     {
 956       return (sanitize_flags_p (SANITIZE_THREAD) && !optimize);
 957     }
 958
 959   unsigned int execute (function *) final override { return tsan_pass (); }
 960
 961 }; // class pass_tsan_O0
 962
 963 } // anon namespace
 964
 965 gimple_opt_pass *
 966 make_pass_tsan_O0 (gcc::context *ctxt)
 967 {
 968   return new pass_tsan_O0 (ctxt);
 969 }