gcc/tsan.c

   1 /* GCC instrumentation plugin for ThreadSanitizer.
   2    Copyright (C) 2011-2015 Free Software Foundation, Inc.
   3    Contributed by Dmitry Vyukov <dvyukov@google.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "alias.h"
  26 #include "symtab.h"
  27 #include "options.h"
  28 #include "tree.h"
  29 #include "fold-const.h"
  30 #include "tm.h"
  31 #include "hard-reg-set.h"
  32 #include "function.h"
  33 #include "rtl.h"
  34 #include "flags.h"
  35 #include "insn-config.h"
  36 #include "expmed.h"
  37 #include "dojump.h"
  38 #include "explow.h"
  39 #include "calls.h"
  40 #include "emit-rtl.h"
  41 #include "varasm.h"
  42 #include "stmt.h"
  43 #include "expr.h"
  44 #include "intl.h"
  45 #include "predict.h"
  46 #include "dominance.h"
  47 #include "cfg.h"
  48 #include "basic-block.h"
  49 #include "tree-ssa-alias.h"
  50 #include "internal-fn.h"
  51 #include "gimple-expr.h"
  52 #include "gimple.h"
  53 #include "gimplify.h"
  54 #include "gimple-iterator.h"
  55 #include "gimplify-me.h"
  56 #include "gimple-ssa.h"
  57 #include "cgraph.h"
  58 #include "tree-cfg.h"
  59 #include "stringpool.h"
  60 #include "tree-ssanames.h"
  61 #include "tree-pass.h"
  62 #include "tree-iterator.h"
  63 #include "langhooks.h"
  64 #include "output.h"
  65 #include "target.h"
  66 #include "diagnostic.h"
  67 #include "tree-ssa-propagate.h"
  68 #include "tree-ssa-loop-ivopts.h"
  69 #include "tsan.h"
  70 #include "asan.h"
  71 #include "builtins.h"
  72
  73 /* Number of instrumented memory accesses in the current function.  */
  74
  75 /* Builds the following decl
  76    void __tsan_read/writeX (void *addr);  */
  77
  78 static tree
  79 get_memory_access_decl (bool is_write, unsigned size)
  80 {
  81   enum built_in_function fcode;
  82
  83   if (size <= 1)
  84     fcode = is_write ? BUILT_IN_TSAN_WRITE1
  85                      : BUILT_IN_TSAN_READ1;
  86   else if (size <= 3)
  87     fcode = is_write ? BUILT_IN_TSAN_WRITE2
  88                      : BUILT_IN_TSAN_READ2;
  89   else if (size <= 7)
  90     fcode = is_write ? BUILT_IN_TSAN_WRITE4
  91                      : BUILT_IN_TSAN_READ4;
  92   else if (size <= 15)
  93     fcode = is_write ? BUILT_IN_TSAN_WRITE8
  94                      : BUILT_IN_TSAN_READ8;
  95   else
  96     fcode = is_write ? BUILT_IN_TSAN_WRITE16
  97                      : BUILT_IN_TSAN_READ16;
  98
  99   return builtin_decl_implicit (fcode);
 100 }
 101
 102 /* Check as to whether EXPR refers to a store to vptr.  */
 103
 104 static tree
 105 is_vptr_store (gimple stmt, tree expr, bool is_write)
 106 {
 107   if (is_write == true
 108       && gimple_assign_single_p (stmt)
 109       && TREE_CODE (expr) == COMPONENT_REF)
 110     {
 111       tree field = TREE_OPERAND (expr, 1);
 112       if (TREE_CODE (field) == FIELD_DECL
 113           && DECL_VIRTUAL_P (field))
 114         return gimple_assign_rhs1 (stmt);
 115     }
 116   return NULL;
 117 }
 118
 119 /* Instruments EXPR if needed. If any instrumentation is inserted,
 120    return true.  */
 121
 122 static bool
 123 instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 124 {
 125   tree base, rhs, expr_ptr, builtin_decl;
 126   basic_block bb;
 127   HOST_WIDE_INT size;
 128   gimple stmt, g;
 129   gimple_seq seq;
 130   location_t loc;
 131   unsigned int align;
 132
 133   size = int_size_in_bytes (TREE_TYPE (expr));
 134   if (size <= 0)
 135     return false;
 136
 137   HOST_WIDE_INT bitsize, bitpos;
 138   tree offset;
 139   machine_mode mode;
 140   int volatilep = 0, unsignedp = 0;
 141   base = get_inner_reference (expr, &bitsize, &bitpos, &offset,
 142                               &mode, &unsignedp, &volatilep, false);
 143
 144   /* No need to instrument accesses to decls that don't escape,
 145      they can't escape to other threads then.  */
 146   if (DECL_P (base) && !is_global_var (base))
 147     {
 148       struct pt_solution pt;
 149       memset (&pt, 0, sizeof (pt));
 150       pt.escaped = 1;
 151       pt.ipa_escaped = flag_ipa_pta != 0;
 152       if (!pt_solution_includes (&pt, base))
 153         return false;
 154       if (!may_be_aliased (base))
 155         return false;
 156     }
 157
 158   if (TREE_READONLY (base)
 159       || (TREE_CODE (base) == VAR_DECL
 160           && DECL_HARD_REGISTER (base)))
 161     return false;
 162
 163   stmt = gsi_stmt (gsi);
 164   loc = gimple_location (stmt);
 165   rhs = is_vptr_store (stmt, expr, is_write);
 166
 167   if ((TREE_CODE (expr) == COMPONENT_REF
 168        && DECL_BIT_FIELD_TYPE (TREE_OPERAND (expr, 1)))
 169       || TREE_CODE (expr) == BIT_FIELD_REF)
 170     {
 171       base = TREE_OPERAND (expr, 0);
 172       if (TREE_CODE (expr) == COMPONENT_REF)
 173         {
 174           expr = TREE_OPERAND (expr, 1);
 175           if (is_write && DECL_BIT_FIELD_REPRESENTATIVE (expr))
 176             expr = DECL_BIT_FIELD_REPRESENTATIVE (expr);
 177           if (!tree_fits_uhwi_p (DECL_FIELD_OFFSET (expr))
 178               || !tree_fits_uhwi_p (DECL_FIELD_BIT_OFFSET (expr))
 179               || !tree_fits_uhwi_p (DECL_SIZE (expr)))
 180             return false;
 181           bitpos = tree_to_uhwi (DECL_FIELD_OFFSET (expr)) * BITS_PER_UNIT
 182                    + tree_to_uhwi (DECL_FIELD_BIT_OFFSET (expr));
 183           bitsize = tree_to_uhwi (DECL_SIZE (expr));
 184         }
 185       else
 186         {
 187           if (!tree_fits_uhwi_p (TREE_OPERAND (expr, 2))
 188               || !tree_fits_uhwi_p (TREE_OPERAND (expr, 1)))
 189             return false;
 190           bitpos = tree_to_uhwi (TREE_OPERAND (expr, 2));
 191           bitsize = tree_to_uhwi (TREE_OPERAND (expr, 1));
 192         }
 193       if (bitpos < 0 || bitsize <= 0)
 194         return false;
 195       size = (bitpos % BITS_PER_UNIT + bitsize + BITS_PER_UNIT - 1)
 196              / BITS_PER_UNIT;
 197       if (may_be_nonaddressable_p (base))
 198         return false;
 199       align = get_object_alignment (base);
 200       if (align < BITS_PER_UNIT)
 201         return false;
 202       bitpos = bitpos & ~(BITS_PER_UNIT - 1);
 203       if ((align - 1) & bitpos)
 204         {
 205           align = (align - 1) & bitpos;
 206           align = align & -align;
 207         }
 208       expr = build_fold_addr_expr (unshare_expr (base));
 209       expr = build2 (MEM_REF, char_type_node, expr,
 210                      build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
 211       expr_ptr = build_fold_addr_expr (expr);
 212     }
 213   else
 214     {
 215       if (may_be_nonaddressable_p (expr))
 216         return false;
 217       align = get_object_alignment (expr);
 218       if (align < BITS_PER_UNIT)
 219         return false;
 220       expr_ptr = build_fold_addr_expr (unshare_expr (expr));
 221     }
 222   expr_ptr = force_gimple_operand (expr_ptr, &seq, true, NULL_TREE);
 223   if ((size & (size - 1)) != 0 || size > 16
 224       || align < MIN (size, 8) * BITS_PER_UNIT)
 225     {
 226       builtin_decl = builtin_decl_implicit (is_write
 227                                             ? BUILT_IN_TSAN_WRITE_RANGE
 228                                             : BUILT_IN_TSAN_READ_RANGE);
 229       g = gimple_build_call (builtin_decl, 2, expr_ptr, size_int (size));
 230     }
 231   else if (rhs == NULL)
 232     g = gimple_build_call (get_memory_access_decl (is_write, size),
 233                            1, expr_ptr);
 234   else
 235     {
 236       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_VPTR_UPDATE);
 237       g = gimple_build_call (builtin_decl, 2, expr_ptr, unshare_expr (rhs));
 238     }
 239   gimple_set_location (g, loc);
 240   gimple_seq_add_stmt_without_update (&seq, g);
 241   /* Instrumentation for assignment of a function result
 242      must be inserted after the call.  Instrumentation for
 243      reads of function arguments must be inserted before the call.
 244      That's because the call can contain synchronization.  */
 245   if (is_gimple_call (stmt) && is_write)
 246     {
 247       /* If the call can throw, it must be the last stmt in
 248          a basic block, so the instrumented stmts need to be
 249          inserted in successor bbs.  */
 250       if (is_ctrl_altering_stmt (stmt))
 251         {
 252           edge e;
 253
 254           bb = gsi_bb (gsi);
 255           e = find_fallthru_edge (bb->succs);
 256           if (e)
 257             gsi_insert_seq_on_edge_immediate (e, seq);
 258         }
 259       else
 260         gsi_insert_seq_after (&gsi, seq, GSI_NEW_STMT);
 261     }
 262   else
 263     gsi_insert_seq_before (&gsi, seq, GSI_SAME_STMT);
 264
 265   return true;
 266 }
 267
 268 /* Actions for sync/atomic builtin transformations.  */
 269 enum tsan_atomic_action
 270 {
 271   check_last, add_seq_cst, add_acquire, weak_cas, strong_cas,
 272   bool_cas, val_cas, lock_release, fetch_op, fetch_op_seq_cst
 273 };
 274
 275 /* Table how to map sync/atomic builtins to their corresponding
 276    tsan equivalents.  */
 277 static const struct tsan_map_atomic
 278 {
 279   enum built_in_function fcode, tsan_fcode;
 280   enum tsan_atomic_action action;
 281   enum tree_code code;
 282 } tsan_atomic_table[] =
 283 {
 284 #define TRANSFORM(fcode, tsan_fcode, action, code) \
 285   { BUILT_IN_##fcode, BUILT_IN_##tsan_fcode, action, code }
 286 #define CHECK_LAST(fcode, tsan_fcode) \
 287   TRANSFORM (fcode, tsan_fcode, check_last, ERROR_MARK)
 288 #define ADD_SEQ_CST(fcode, tsan_fcode) \
 289   TRANSFORM (fcode, tsan_fcode, add_seq_cst, ERROR_MARK)
 290 #define ADD_ACQUIRE(fcode, tsan_fcode) \
 291   TRANSFORM (fcode, tsan_fcode, add_acquire, ERROR_MARK)
 292 #define WEAK_CAS(fcode, tsan_fcode) \
 293   TRANSFORM (fcode, tsan_fcode, weak_cas, ERROR_MARK)
 294 #define STRONG_CAS(fcode, tsan_fcode) \
 295   TRANSFORM (fcode, tsan_fcode, strong_cas, ERROR_MARK)
 296 #define BOOL_CAS(fcode, tsan_fcode) \
 297   TRANSFORM (fcode, tsan_fcode, bool_cas, ERROR_MARK)
 298 #define VAL_CAS(fcode, tsan_fcode) \
 299   TRANSFORM (fcode, tsan_fcode, val_cas, ERROR_MARK)
 300 #define LOCK_RELEASE(fcode, tsan_fcode) \
 301   TRANSFORM (fcode, tsan_fcode, lock_release, ERROR_MARK)
 302 #define FETCH_OP(fcode, tsan_fcode, code) \
 303   TRANSFORM (fcode, tsan_fcode, fetch_op, code)
 304 #define FETCH_OPS(fcode, tsan_fcode, code) \
 305   TRANSFORM (fcode, tsan_fcode, fetch_op_seq_cst, code)
 306
 307   CHECK_LAST (ATOMIC_LOAD_1, TSAN_ATOMIC8_LOAD),
 308   CHECK_LAST (ATOMIC_LOAD_2, TSAN_ATOMIC16_LOAD),
 309   CHECK_LAST (ATOMIC_LOAD_4, TSAN_ATOMIC32_LOAD),
 310   CHECK_LAST (ATOMIC_LOAD_8, TSAN_ATOMIC64_LOAD),
 311   CHECK_LAST (ATOMIC_LOAD_16, TSAN_ATOMIC128_LOAD),
 312   CHECK_LAST (ATOMIC_STORE_1, TSAN_ATOMIC8_STORE),
 313   CHECK_LAST (ATOMIC_STORE_2, TSAN_ATOMIC16_STORE),
 314   CHECK_LAST (ATOMIC_STORE_4, TSAN_ATOMIC32_STORE),
 315   CHECK_LAST (ATOMIC_STORE_8, TSAN_ATOMIC64_STORE),
 316   CHECK_LAST (ATOMIC_STORE_16, TSAN_ATOMIC128_STORE),
 317   CHECK_LAST (ATOMIC_EXCHANGE_1, TSAN_ATOMIC8_EXCHANGE),
 318   CHECK_LAST (ATOMIC_EXCHANGE_2, TSAN_ATOMIC16_EXCHANGE),
 319   CHECK_LAST (ATOMIC_EXCHANGE_4, TSAN_ATOMIC32_EXCHANGE),
 320   CHECK_LAST (ATOMIC_EXCHANGE_8, TSAN_ATOMIC64_EXCHANGE),
 321   CHECK_LAST (ATOMIC_EXCHANGE_16, TSAN_ATOMIC128_EXCHANGE),
 322   CHECK_LAST (ATOMIC_FETCH_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 323   CHECK_LAST (ATOMIC_FETCH_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 324   CHECK_LAST (ATOMIC_FETCH_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 325   CHECK_LAST (ATOMIC_FETCH_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 326   CHECK_LAST (ATOMIC_FETCH_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 327   CHECK_LAST (ATOMIC_FETCH_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 328   CHECK_LAST (ATOMIC_FETCH_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 329   CHECK_LAST (ATOMIC_FETCH_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 330   CHECK_LAST (ATOMIC_FETCH_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 331   CHECK_LAST (ATOMIC_FETCH_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 332   CHECK_LAST (ATOMIC_FETCH_AND_1, TSAN_ATOMIC8_FETCH_AND),
 333   CHECK_LAST (ATOMIC_FETCH_AND_2, TSAN_ATOMIC16_FETCH_AND),
 334   CHECK_LAST (ATOMIC_FETCH_AND_4, TSAN_ATOMIC32_FETCH_AND),
 335   CHECK_LAST (ATOMIC_FETCH_AND_8, TSAN_ATOMIC64_FETCH_AND),
 336   CHECK_LAST (ATOMIC_FETCH_AND_16, TSAN_ATOMIC128_FETCH_AND),
 337   CHECK_LAST (ATOMIC_FETCH_OR_1, TSAN_ATOMIC8_FETCH_OR),
 338   CHECK_LAST (ATOMIC_FETCH_OR_2, TSAN_ATOMIC16_FETCH_OR),
 339   CHECK_LAST (ATOMIC_FETCH_OR_4, TSAN_ATOMIC32_FETCH_OR),
 340   CHECK_LAST (ATOMIC_FETCH_OR_8, TSAN_ATOMIC64_FETCH_OR),
 341   CHECK_LAST (ATOMIC_FETCH_OR_16, TSAN_ATOMIC128_FETCH_OR),
 342   CHECK_LAST (ATOMIC_FETCH_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 343   CHECK_LAST (ATOMIC_FETCH_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 344   CHECK_LAST (ATOMIC_FETCH_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 345   CHECK_LAST (ATOMIC_FETCH_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 346   CHECK_LAST (ATOMIC_FETCH_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 347   CHECK_LAST (ATOMIC_FETCH_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 348   CHECK_LAST (ATOMIC_FETCH_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 349   CHECK_LAST (ATOMIC_FETCH_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 350   CHECK_LAST (ATOMIC_FETCH_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 351   CHECK_LAST (ATOMIC_FETCH_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 352
 353   CHECK_LAST (ATOMIC_THREAD_FENCE, TSAN_ATOMIC_THREAD_FENCE),
 354   CHECK_LAST (ATOMIC_SIGNAL_FENCE, TSAN_ATOMIC_SIGNAL_FENCE),
 355
 356   FETCH_OP (ATOMIC_ADD_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 357   FETCH_OP (ATOMIC_ADD_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 358   FETCH_OP (ATOMIC_ADD_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 359   FETCH_OP (ATOMIC_ADD_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 360   FETCH_OP (ATOMIC_ADD_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 361   FETCH_OP (ATOMIC_SUB_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 362   FETCH_OP (ATOMIC_SUB_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 363   FETCH_OP (ATOMIC_SUB_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 364   FETCH_OP (ATOMIC_SUB_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 365   FETCH_OP (ATOMIC_SUB_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 366   FETCH_OP (ATOMIC_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 367   FETCH_OP (ATOMIC_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 368   FETCH_OP (ATOMIC_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 369   FETCH_OP (ATOMIC_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 370   FETCH_OP (ATOMIC_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 371   FETCH_OP (ATOMIC_OR_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 372   FETCH_OP (ATOMIC_OR_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 373   FETCH_OP (ATOMIC_OR_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 374   FETCH_OP (ATOMIC_OR_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 375   FETCH_OP (ATOMIC_OR_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 376   FETCH_OP (ATOMIC_XOR_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 377   FETCH_OP (ATOMIC_XOR_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 378   FETCH_OP (ATOMIC_XOR_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 379   FETCH_OP (ATOMIC_XOR_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 380   FETCH_OP (ATOMIC_XOR_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 381   FETCH_OP (ATOMIC_NAND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 382   FETCH_OP (ATOMIC_NAND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 383   FETCH_OP (ATOMIC_NAND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 384   FETCH_OP (ATOMIC_NAND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 385   FETCH_OP (ATOMIC_NAND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 386
 387   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_1, TSAN_ATOMIC8_EXCHANGE),
 388   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_2, TSAN_ATOMIC16_EXCHANGE),
 389   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_4, TSAN_ATOMIC32_EXCHANGE),
 390   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_8, TSAN_ATOMIC64_EXCHANGE),
 391   ADD_ACQUIRE (SYNC_LOCK_TEST_AND_SET_16, TSAN_ATOMIC128_EXCHANGE),
 392
 393   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_1, TSAN_ATOMIC8_FETCH_ADD),
 394   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_2, TSAN_ATOMIC16_FETCH_ADD),
 395   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_4, TSAN_ATOMIC32_FETCH_ADD),
 396   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_8, TSAN_ATOMIC64_FETCH_ADD),
 397   ADD_SEQ_CST (SYNC_FETCH_AND_ADD_16, TSAN_ATOMIC128_FETCH_ADD),
 398   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_1, TSAN_ATOMIC8_FETCH_SUB),
 399   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_2, TSAN_ATOMIC16_FETCH_SUB),
 400   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_4, TSAN_ATOMIC32_FETCH_SUB),
 401   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_8, TSAN_ATOMIC64_FETCH_SUB),
 402   ADD_SEQ_CST (SYNC_FETCH_AND_SUB_16, TSAN_ATOMIC128_FETCH_SUB),
 403   ADD_SEQ_CST (SYNC_FETCH_AND_AND_1, TSAN_ATOMIC8_FETCH_AND),
 404   ADD_SEQ_CST (SYNC_FETCH_AND_AND_2, TSAN_ATOMIC16_FETCH_AND),
 405   ADD_SEQ_CST (SYNC_FETCH_AND_AND_4, TSAN_ATOMIC32_FETCH_AND),
 406   ADD_SEQ_CST (SYNC_FETCH_AND_AND_8, TSAN_ATOMIC64_FETCH_AND),
 407   ADD_SEQ_CST (SYNC_FETCH_AND_AND_16, TSAN_ATOMIC128_FETCH_AND),
 408   ADD_SEQ_CST (SYNC_FETCH_AND_OR_1, TSAN_ATOMIC8_FETCH_OR),
 409   ADD_SEQ_CST (SYNC_FETCH_AND_OR_2, TSAN_ATOMIC16_FETCH_OR),
 410   ADD_SEQ_CST (SYNC_FETCH_AND_OR_4, TSAN_ATOMIC32_FETCH_OR),
 411   ADD_SEQ_CST (SYNC_FETCH_AND_OR_8, TSAN_ATOMIC64_FETCH_OR),
 412   ADD_SEQ_CST (SYNC_FETCH_AND_OR_16, TSAN_ATOMIC128_FETCH_OR),
 413   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_1, TSAN_ATOMIC8_FETCH_XOR),
 414   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_2, TSAN_ATOMIC16_FETCH_XOR),
 415   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_4, TSAN_ATOMIC32_FETCH_XOR),
 416   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_8, TSAN_ATOMIC64_FETCH_XOR),
 417   ADD_SEQ_CST (SYNC_FETCH_AND_XOR_16, TSAN_ATOMIC128_FETCH_XOR),
 418   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_1, TSAN_ATOMIC8_FETCH_NAND),
 419   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_2, TSAN_ATOMIC16_FETCH_NAND),
 420   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_4, TSAN_ATOMIC32_FETCH_NAND),
 421   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_8, TSAN_ATOMIC64_FETCH_NAND),
 422   ADD_SEQ_CST (SYNC_FETCH_AND_NAND_16, TSAN_ATOMIC128_FETCH_NAND),
 423
 424   ADD_SEQ_CST (SYNC_SYNCHRONIZE, TSAN_ATOMIC_THREAD_FENCE),
 425
 426   FETCH_OPS (SYNC_ADD_AND_FETCH_1, TSAN_ATOMIC8_FETCH_ADD, PLUS_EXPR),
 427   FETCH_OPS (SYNC_ADD_AND_FETCH_2, TSAN_ATOMIC16_FETCH_ADD, PLUS_EXPR),
 428   FETCH_OPS (SYNC_ADD_AND_FETCH_4, TSAN_ATOMIC32_FETCH_ADD, PLUS_EXPR),
 429   FETCH_OPS (SYNC_ADD_AND_FETCH_8, TSAN_ATOMIC64_FETCH_ADD, PLUS_EXPR),
 430   FETCH_OPS (SYNC_ADD_AND_FETCH_16, TSAN_ATOMIC128_FETCH_ADD, PLUS_EXPR),
 431   FETCH_OPS (SYNC_SUB_AND_FETCH_1, TSAN_ATOMIC8_FETCH_SUB, MINUS_EXPR),
 432   FETCH_OPS (SYNC_SUB_AND_FETCH_2, TSAN_ATOMIC16_FETCH_SUB, MINUS_EXPR),
 433   FETCH_OPS (SYNC_SUB_AND_FETCH_4, TSAN_ATOMIC32_FETCH_SUB, MINUS_EXPR),
 434   FETCH_OPS (SYNC_SUB_AND_FETCH_8, TSAN_ATOMIC64_FETCH_SUB, MINUS_EXPR),
 435   FETCH_OPS (SYNC_SUB_AND_FETCH_16, TSAN_ATOMIC128_FETCH_SUB, MINUS_EXPR),
 436   FETCH_OPS (SYNC_AND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_AND, BIT_AND_EXPR),
 437   FETCH_OPS (SYNC_AND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_AND, BIT_AND_EXPR),
 438   FETCH_OPS (SYNC_AND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_AND, BIT_AND_EXPR),
 439   FETCH_OPS (SYNC_AND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_AND, BIT_AND_EXPR),
 440   FETCH_OPS (SYNC_AND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_AND, BIT_AND_EXPR),
 441   FETCH_OPS (SYNC_OR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_OR, BIT_IOR_EXPR),
 442   FETCH_OPS (SYNC_OR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_OR, BIT_IOR_EXPR),
 443   FETCH_OPS (SYNC_OR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_OR, BIT_IOR_EXPR),
 444   FETCH_OPS (SYNC_OR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_OR, BIT_IOR_EXPR),
 445   FETCH_OPS (SYNC_OR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_OR, BIT_IOR_EXPR),
 446   FETCH_OPS (SYNC_XOR_AND_FETCH_1, TSAN_ATOMIC8_FETCH_XOR, BIT_XOR_EXPR),
 447   FETCH_OPS (SYNC_XOR_AND_FETCH_2, TSAN_ATOMIC16_FETCH_XOR, BIT_XOR_EXPR),
 448   FETCH_OPS (SYNC_XOR_AND_FETCH_4, TSAN_ATOMIC32_FETCH_XOR, BIT_XOR_EXPR),
 449   FETCH_OPS (SYNC_XOR_AND_FETCH_8, TSAN_ATOMIC64_FETCH_XOR, BIT_XOR_EXPR),
 450   FETCH_OPS (SYNC_XOR_AND_FETCH_16, TSAN_ATOMIC128_FETCH_XOR, BIT_XOR_EXPR),
 451   FETCH_OPS (SYNC_NAND_AND_FETCH_1, TSAN_ATOMIC8_FETCH_NAND, BIT_NOT_EXPR),
 452   FETCH_OPS (SYNC_NAND_AND_FETCH_2, TSAN_ATOMIC16_FETCH_NAND, BIT_NOT_EXPR),
 453   FETCH_OPS (SYNC_NAND_AND_FETCH_4, TSAN_ATOMIC32_FETCH_NAND, BIT_NOT_EXPR),
 454   FETCH_OPS (SYNC_NAND_AND_FETCH_8, TSAN_ATOMIC64_FETCH_NAND, BIT_NOT_EXPR),
 455   FETCH_OPS (SYNC_NAND_AND_FETCH_16, TSAN_ATOMIC128_FETCH_NAND, BIT_NOT_EXPR),
 456
 457   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_WEAK),
 458   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_WEAK),
 459   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_WEAK),
 460   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_WEAK),
 461   WEAK_CAS (ATOMIC_COMPARE_EXCHANGE_16, TSAN_ATOMIC128_COMPARE_EXCHANGE_WEAK),
 462
 463   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 464   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_2,
 465               TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 466   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_4,
 467               TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 468   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_8,
 469               TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 470   STRONG_CAS (ATOMIC_COMPARE_EXCHANGE_16,
 471               TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 472
 473   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_1,
 474             TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 475   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_2,
 476             TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 477   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_4,
 478             TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 479   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_8,
 480             TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 481   BOOL_CAS (SYNC_BOOL_COMPARE_AND_SWAP_16,
 482             TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 483
 484   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_1, TSAN_ATOMIC8_COMPARE_EXCHANGE_STRONG),
 485   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_2, TSAN_ATOMIC16_COMPARE_EXCHANGE_STRONG),
 486   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_4, TSAN_ATOMIC32_COMPARE_EXCHANGE_STRONG),
 487   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_8, TSAN_ATOMIC64_COMPARE_EXCHANGE_STRONG),
 488   VAL_CAS (SYNC_VAL_COMPARE_AND_SWAP_16,
 489            TSAN_ATOMIC128_COMPARE_EXCHANGE_STRONG),
 490
 491   LOCK_RELEASE (SYNC_LOCK_RELEASE_1, TSAN_ATOMIC8_STORE),
 492   LOCK_RELEASE (SYNC_LOCK_RELEASE_2, TSAN_ATOMIC16_STORE),
 493   LOCK_RELEASE (SYNC_LOCK_RELEASE_4, TSAN_ATOMIC32_STORE),
 494   LOCK_RELEASE (SYNC_LOCK_RELEASE_8, TSAN_ATOMIC64_STORE),
 495   LOCK_RELEASE (SYNC_LOCK_RELEASE_16, TSAN_ATOMIC128_STORE)
 496 };
 497
 498 /* Instrument an atomic builtin.  */
 499
 500 static void
 501 instrument_builtin_call (gimple_stmt_iterator *gsi)
 502 {
 503   gimple stmt = gsi_stmt (*gsi), g;
 504   tree callee = gimple_call_fndecl (stmt), last_arg, args[6], t, lhs;
 505   enum built_in_function fcode = DECL_FUNCTION_CODE (callee);
 506   unsigned int i, num = gimple_call_num_args (stmt), j;
 507   for (j = 0; j < 6 && j < num; j++)
 508     args[j] = gimple_call_arg (stmt, j);
 509   for (i = 0; i < ARRAY_SIZE (tsan_atomic_table); i++)
 510     if (fcode != tsan_atomic_table[i].fcode)
 511       continue;
 512     else
 513       {
 514         tree decl = builtin_decl_implicit (tsan_atomic_table[i].tsan_fcode);
 515         if (decl == NULL_TREE)
 516           return;
 517         switch (tsan_atomic_table[i].action)
 518           {
 519           case check_last:
 520           case fetch_op:
 521             last_arg = gimple_call_arg (stmt, num - 1);
 522             if (!tree_fits_uhwi_p (last_arg)
 523                 || memmodel_base (tree_to_uhwi (last_arg)) >= MEMMODEL_LAST)
 524               return;
 525             gimple_call_set_fndecl (stmt, decl);
 526             update_stmt (stmt);
 527             if (tsan_atomic_table[i].action == fetch_op)
 528               {
 529                 args[1] = gimple_call_arg (stmt, 1);
 530                 goto adjust_result;
 531               }
 532             return;
 533           case add_seq_cst:
 534           case add_acquire:
 535           case fetch_op_seq_cst:
 536             gcc_assert (num <= 2);
 537             for (j = 0; j < num; j++)
 538               args[j] = gimple_call_arg (stmt, j);
 539             for (; j < 2; j++)
 540               args[j] = NULL_TREE;
 541             args[num] = build_int_cst (NULL_TREE,
 542                                        tsan_atomic_table[i].action
 543                                        != add_acquire
 544                                        ? MEMMODEL_SEQ_CST
 545                                        : MEMMODEL_ACQUIRE);
 546             update_gimple_call (gsi, decl, num + 1, args[0], args[1], args[2]);
 547             stmt = gsi_stmt (*gsi);
 548             if (tsan_atomic_table[i].action == fetch_op_seq_cst)
 549               {
 550               adjust_result:
 551                 lhs = gimple_call_lhs (stmt);
 552                 if (lhs == NULL_TREE)
 553                   return;
 554                 if (!useless_type_conversion_p (TREE_TYPE (lhs),
 555                                                 TREE_TYPE (args[1])))
 556                   {
 557                     tree var = make_ssa_name (TREE_TYPE (lhs));
 558                     g = gimple_build_assign (var, NOP_EXPR, args[1]);
 559                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 560                     args[1] = var;
 561                   }
 562                 gimple_call_set_lhs (stmt, make_ssa_name (TREE_TYPE (lhs)));
 563                 /* BIT_NOT_EXPR stands for NAND.  */
 564                 if (tsan_atomic_table[i].code == BIT_NOT_EXPR)
 565                   {
 566                     tree var = make_ssa_name (TREE_TYPE (lhs));
 567                     g = gimple_build_assign (var, BIT_AND_EXPR,
 568                                              gimple_call_lhs (stmt), args[1]);
 569                     gsi_insert_after (gsi, g, GSI_NEW_STMT);
 570                     g = gimple_build_assign (lhs, BIT_NOT_EXPR, var);
 571                   }
 572                 else
 573                   g = gimple_build_assign (lhs, tsan_atomic_table[i].code,
 574                                            gimple_call_lhs (stmt), args[1]);
 575                 update_stmt (stmt);
 576                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 577               }
 578             return;
 579           case weak_cas:
 580             if (!integer_nonzerop (gimple_call_arg (stmt, 3)))
 581               continue;
 582             /* FALLTHRU */
 583           case strong_cas:
 584             gcc_assert (num == 6);
 585             for (j = 0; j < 6; j++)
 586               args[j] = gimple_call_arg (stmt, j);
 587             if (!tree_fits_uhwi_p (args[4])
 588                 || memmodel_base (tree_to_uhwi (args[4])) >= MEMMODEL_LAST)
 589               return;
 590             if (!tree_fits_uhwi_p (args[5])
 591                 || memmodel_base (tree_to_uhwi (args[5])) >= MEMMODEL_LAST)
 592               return;
 593             update_gimple_call (gsi, decl, 5, args[0], args[1], args[2],
 594                                 args[4], args[5]);
 595             return;
 596           case bool_cas:
 597           case val_cas:
 598             gcc_assert (num == 3);
 599             for (j = 0; j < 3; j++)
 600               args[j] = gimple_call_arg (stmt, j);
 601             t = TYPE_ARG_TYPES (TREE_TYPE (decl));
 602             t = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (t)));
 603             t = create_tmp_var (t);
 604             mark_addressable (t);
 605             if (!useless_type_conversion_p (TREE_TYPE (t),
 606                                             TREE_TYPE (args[1])))
 607               {
 608                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)),
 609                                          NOP_EXPR, args[1]);
 610                 gsi_insert_before (gsi, g, GSI_SAME_STMT);
 611                 args[1] = gimple_assign_lhs (g);
 612               }
 613             g = gimple_build_assign (t, args[1]);
 614             gsi_insert_before (gsi, g, GSI_SAME_STMT);
 615             lhs = gimple_call_lhs (stmt);
 616             update_gimple_call (gsi, decl, 5, args[0],
 617                                 build_fold_addr_expr (t), args[2],
 618                                 build_int_cst (NULL_TREE,
 619                                                MEMMODEL_SEQ_CST),
 620                                 build_int_cst (NULL_TREE,
 621                                                MEMMODEL_SEQ_CST));
 622             if (tsan_atomic_table[i].action == val_cas && lhs)
 623               {
 624                 tree cond;
 625                 stmt = gsi_stmt (*gsi);
 626                 g = gimple_build_assign (make_ssa_name (TREE_TYPE (t)), t);
 627                 gsi_insert_after (gsi, g, GSI_NEW_STMT);
 628                 t = make_ssa_name (TREE_TYPE (TREE_TYPE (decl)), stmt);
 629                 cond = build2 (NE_EXPR, boolean_type_node, t,
 630                                build_int_cst (TREE_TYPE (t), 0));
 631                 g = gimple_build_assign (lhs, COND_EXPR, cond, args[1],
 632                                          gimple_assign_lhs (g));
 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             return;
 647           default:
 648             continue;
 649           }
 650       }
 651 }
 652
 653 /* Instruments the gimple pointed to by GSI. Return
 654    true if func entry/exit should be instrumented.  */
 655
 656 static bool
 657 instrument_gimple (gimple_stmt_iterator *gsi)
 658 {
 659   gimple stmt;
 660   tree rhs, lhs;
 661   bool instrumented = false;
 662
 663   stmt = gsi_stmt (*gsi);
 664   if (is_gimple_call (stmt)
 665       && (gimple_call_fndecl (stmt)
 666           != builtin_decl_implicit (BUILT_IN_TSAN_INIT)))
 667     {
 668       /* All functions with function call will have exit instrumented,
 669          therefore no function calls other than __tsan_func_exit
 670          shall appear in the functions.  */
 671       gimple_call_set_tail (as_a <gcall *> (stmt), false);
 672       if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
 673         instrument_builtin_call (gsi);
 674       return true;
 675     }
 676   else if (is_gimple_assign (stmt)
 677            && !gimple_clobber_p (stmt))
 678     {
 679       if (gimple_store_p (stmt))
 680         {
 681           lhs = gimple_assign_lhs (stmt);
 682           instrumented = instrument_expr (*gsi, lhs, true);
 683         }
 684       if (gimple_assign_load_p (stmt))
 685         {
 686           rhs = gimple_assign_rhs1 (stmt);
 687           instrumented = instrument_expr (*gsi, rhs, false);
 688         }
 689     }
 690   return instrumented;
 691 }
 692
 693 /* Replace TSAN_FUNC_EXIT internal call with function exit tsan builtin.  */
 694
 695 static void
 696 replace_func_exit (gimple stmt)
 697 {
 698   tree builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 699   gimple g = gimple_build_call (builtin_decl, 0);
 700   gimple_set_location (g, cfun->function_end_locus);
 701   gimple_stmt_iterator gsi = gsi_for_stmt (stmt);
 702   gsi_replace (&gsi, g, true);
 703 }
 704
 705 /* Instrument function exit.  Used when TSAN_FUNC_EXIT does not exist.  */
 706
 707 static void
 708 instrument_func_exit (void)
 709 {
 710   location_t loc;
 711   basic_block exit_bb;
 712   gimple_stmt_iterator gsi;
 713   gimple stmt, g;
 714   tree builtin_decl;
 715   edge e;
 716   edge_iterator ei;
 717
 718   /* Find all function exits.  */
 719   exit_bb = EXIT_BLOCK_PTR_FOR_FN (cfun);
 720   FOR_EACH_EDGE (e, ei, exit_bb->preds)
 721     {
 722       gsi = gsi_last_bb (e->src);
 723       stmt = gsi_stmt (gsi);
 724       gcc_assert (gimple_code (stmt) == GIMPLE_RETURN
 725                   || gimple_call_builtin_p (stmt, BUILT_IN_RETURN));
 726       loc = gimple_location (stmt);
 727       builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_EXIT);
 728       g = gimple_build_call (builtin_decl, 0);
 729       gimple_set_location (g, loc);
 730       gsi_insert_before (&gsi, g, GSI_SAME_STMT);
 731     }
 732 }
 733
 734 /* Instruments all interesting memory accesses in the current function.
 735    Return true if func entry/exit should be instrumented.  */
 736
 737 static bool
 738 instrument_memory_accesses (void)
 739 {
 740   basic_block bb;
 741   gimple_stmt_iterator gsi;
 742   bool fentry_exit_instrument = false;
 743   bool func_exit_seen = false;
 744   auto_vec<gimple> tsan_func_exits;
 745
 746   FOR_EACH_BB_FN (bb, cfun)
 747     for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
 748       {
 749         gimple stmt = gsi_stmt (gsi);
 750         if (is_gimple_call (stmt)
 751             && gimple_call_internal_p (stmt)
 752             && gimple_call_internal_fn (stmt) == IFN_TSAN_FUNC_EXIT)
 753           {
 754             if (fentry_exit_instrument)
 755               replace_func_exit (stmt);
 756             else
 757               tsan_func_exits.safe_push (stmt);
 758             func_exit_seen = true;
 759           }
 760         else
 761           fentry_exit_instrument |= instrument_gimple (&gsi);
 762       }
 763   unsigned int i;
 764   gimple stmt;
 765   FOR_EACH_VEC_ELT (tsan_func_exits, i, stmt)
 766     if (fentry_exit_instrument)
 767       replace_func_exit (stmt);
 768     else
 769       {
 770         gsi = gsi_for_stmt (stmt);
 771         gsi_remove (&gsi, true);
 772       }
 773   if (fentry_exit_instrument && !func_exit_seen)
 774     instrument_func_exit ();
 775   return fentry_exit_instrument;
 776 }
 777
 778 /* Instruments function entry.  */
 779
 780 static void
 781 instrument_func_entry (void)
 782 {
 783   tree ret_addr, builtin_decl;
 784   gimple g;
 785   gimple_seq seq = NULL;
 786
 787   builtin_decl = builtin_decl_implicit (BUILT_IN_RETURN_ADDRESS);
 788   g = gimple_build_call (builtin_decl, 1, integer_zero_node);
 789   ret_addr = make_ssa_name (ptr_type_node);
 790   gimple_call_set_lhs (g, ret_addr);
 791   gimple_set_location (g, cfun->function_start_locus);
 792   gimple_seq_add_stmt_without_update (&seq, g);
 793
 794   builtin_decl = builtin_decl_implicit (BUILT_IN_TSAN_FUNC_ENTRY);
 795   g = gimple_build_call (builtin_decl, 1, ret_addr);
 796   gimple_set_location (g, cfun->function_start_locus);
 797   gimple_seq_add_stmt_without_update (&seq, g);
 798
 799   edge e = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun));
 800   gsi_insert_seq_on_edge_immediate (e, seq);
 801 }
 802
 803 /* ThreadSanitizer instrumentation pass.  */
 804
 805 static unsigned
 806 tsan_pass (void)
 807 {
 808   initialize_sanitizer_builtins ();
 809   if (instrument_memory_accesses ())
 810     instrument_func_entry ();
 811   return 0;
 812 }
 813
 814 /* Inserts __tsan_init () into the list of CTORs.  */
 815
 816 void
 817 tsan_finish_file (void)
 818 {
 819   tree ctor_statements = NULL_TREE;
 820
 821   initialize_sanitizer_builtins ();
 822   tree init_decl = builtin_decl_implicit (BUILT_IN_TSAN_INIT);
 823   append_to_statement_list (build_call_expr (init_decl, 0),
 824                             &ctor_statements);
 825   cgraph_build_static_cdtor ('I', ctor_statements,
 826                              MAX_RESERVED_INIT_PRIORITY - 1);
 827 }
 828
 829 /* The pass descriptor.  */
 830
 831 namespace {
 832
 833 const pass_data pass_data_tsan =
 834 {
 835   GIMPLE_PASS, /* type */
 836   "tsan", /* name */
 837   OPTGROUP_NONE, /* optinfo_flags */
 838   TV_NONE, /* tv_id */
 839   ( PROP_ssa | PROP_cfg ), /* properties_required */
 840   0, /* properties_provided */
 841   0, /* properties_destroyed */
 842   0, /* todo_flags_start */
 843   TODO_update_ssa, /* todo_flags_finish */
 844 };
 845
 846 class pass_tsan : public gimple_opt_pass
 847 {
 848 public:
 849   pass_tsan (gcc::context *ctxt)
 850     : gimple_opt_pass (pass_data_tsan, ctxt)
 851   {}
 852
 853   /* opt_pass methods: */
 854   opt_pass * clone () { return new pass_tsan (m_ctxt); }
 855   virtual bool gate (function *)
 856 {
 857   return ((flag_sanitize & SANITIZE_THREAD) != 0
 858           && !lookup_attribute ("no_sanitize_thread",
 859                                 DECL_ATTRIBUTES (current_function_decl)));
 860 }
 861
 862   virtual unsigned int execute (function *) { return tsan_pass (); }
 863
 864 }; // class pass_tsan
 865
 866 } // anon namespace
 867
 868 gimple_opt_pass *
 869 make_pass_tsan (gcc::context *ctxt)
 870 {
 871   return new pass_tsan (ctxt);
 872 }
 873
 874 namespace {
 875
 876 const pass_data pass_data_tsan_O0 =
 877 {
 878   GIMPLE_PASS, /* type */
 879   "tsan0", /* name */
 880   OPTGROUP_NONE, /* optinfo_flags */
 881   TV_NONE, /* tv_id */
 882   ( PROP_ssa | PROP_cfg ), /* properties_required */
 883   0, /* properties_provided */
 884   0, /* properties_destroyed */
 885   0, /* todo_flags_start */
 886   TODO_update_ssa, /* todo_flags_finish */
 887 };
 888
 889 class pass_tsan_O0 : public gimple_opt_pass
 890 {
 891 public:
 892   pass_tsan_O0 (gcc::context *ctxt)
 893     : gimple_opt_pass (pass_data_tsan_O0, ctxt)
 894   {}
 895
 896   /* opt_pass methods: */
 897   virtual bool gate (function *)
 898     {
 899       return ((flag_sanitize & SANITIZE_THREAD) != 0 && !optimize
 900               && !lookup_attribute ("no_sanitize_thread",
 901                                     DECL_ATTRIBUTES (current_function_decl)));
 902     }
 903
 904   virtual unsigned int execute (function *) { return tsan_pass (); }
 905
 906 }; // class pass_tsan_O0
 907
 908 } // anon namespace
 909
 910 gimple_opt_pass *
 911 make_pass_tsan_O0 (gcc::context *ctxt)
 912 {
 913   return new pass_tsan_O0 (ctxt);
 914 }