Ejemplo n.º 1
0
static void
lower_builtin_setjmp (gimple_stmt_iterator *gsi)
{
  gimple stmt = gsi_stmt (*gsi);
  location_t loc = gimple_location (stmt);
  tree cont_label = create_artificial_label (loc);
  tree next_label = create_artificial_label (loc);
  tree dest, t, arg;
  gimple g;

  /* NEXT_LABEL is the label __builtin_longjmp will jump to.  Its address is
     passed to both __builtin_setjmp_setup and __builtin_setjmp_receiver.  */
  FORCED_LABEL (next_label) = 1;

  dest = gimple_call_lhs (stmt);

  /* Build '__builtin_setjmp_setup (BUF, NEXT_LABEL)' and insert.  */
  arg = build_addr (next_label, current_function_decl);
  t = builtin_decl_implicit (BUILT_IN_SETJMP_SETUP);
  g = gimple_build_call (t, 2, gimple_call_arg (stmt, 0), arg);
  gimple_set_location (g, loc);
  gimple_set_block (g, gimple_block (stmt));
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build 'DEST = 0' and insert.  */
  if (dest)
    {
      g = gimple_build_assign (dest, build_zero_cst (TREE_TYPE (dest)));
      gimple_set_location (g, loc);
      gimple_set_block (g, gimple_block (stmt));
      gsi_insert_before (gsi, g, GSI_SAME_STMT);
    }

  /* Build 'goto CONT_LABEL' and insert.  */
  g = gimple_build_goto (cont_label);
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build 'NEXT_LABEL:' and insert.  */
  g = gimple_build_label (next_label);
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build '__builtin_setjmp_receiver (NEXT_LABEL)' and insert.  */
  arg = build_addr (next_label, current_function_decl);
  t = builtin_decl_implicit (BUILT_IN_SETJMP_RECEIVER);
  g = gimple_build_call (t, 1, arg);
  gimple_set_location (g, loc);
  gimple_set_block (g, gimple_block (stmt));
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build 'DEST = 1' and insert.  */
  if (dest)
    {
      g = gimple_build_assign (dest, fold_convert_loc (loc, TREE_TYPE (dest),
						       integer_one_node));
      gimple_set_location (g, loc);
      gimple_set_block (g, gimple_block (stmt));
      gsi_insert_before (gsi, g, GSI_SAME_STMT);
    }

  /* Build 'CONT_LABEL:' and insert.  */
  g = gimple_build_label (cont_label);
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Remove the call to __builtin_setjmp.  */
  gsi_remove (gsi, false);
}
Ejemplo n.º 2
0
static void
lower_builtin_setjmp (gimple_stmt_iterator *gsi)
{
  gimple *stmt = gsi_stmt (*gsi);
  location_t loc = gimple_location (stmt);
  tree cont_label = create_artificial_label (loc);
  tree next_label = create_artificial_label (loc);
  tree dest, t, arg;
  gimple *g;

  /* __builtin_setjmp_{setup,receiver} aren't ECF_RETURNS_TWICE and for RTL
     these builtins are modelled as non-local label jumps to the label
     that is passed to these two builtins, so pretend we have a non-local
     label during GIMPLE passes too.  See PR60003.  */ 
  cfun->has_nonlocal_label = 1;

  /* NEXT_LABEL is the label __builtin_longjmp will jump to.  Its address is
     passed to both __builtin_setjmp_setup and __builtin_setjmp_receiver.  */
  FORCED_LABEL (next_label) = 1;

  tree orig_dest = dest = gimple_call_lhs (stmt);
  if (orig_dest && TREE_CODE (orig_dest) == SSA_NAME)
    dest = create_tmp_reg (TREE_TYPE (orig_dest));

  /* Build '__builtin_setjmp_setup (BUF, NEXT_LABEL)' and insert.  */
  arg = build_addr (next_label);
  t = builtin_decl_implicit (BUILT_IN_SETJMP_SETUP);
  g = gimple_build_call (t, 2, gimple_call_arg (stmt, 0), arg);
  gimple_set_location (g, loc);
  gimple_set_block (g, gimple_block (stmt));
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build 'DEST = 0' and insert.  */
  if (dest)
    {
      g = gimple_build_assign (dest, build_zero_cst (TREE_TYPE (dest)));
      gimple_set_location (g, loc);
      gimple_set_block (g, gimple_block (stmt));
      gsi_insert_before (gsi, g, GSI_SAME_STMT);
    }

  /* Build 'goto CONT_LABEL' and insert.  */
  g = gimple_build_goto (cont_label);
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build 'NEXT_LABEL:' and insert.  */
  g = gimple_build_label (next_label);
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build '__builtin_setjmp_receiver (NEXT_LABEL)' and insert.  */
  arg = build_addr (next_label);
  t = builtin_decl_implicit (BUILT_IN_SETJMP_RECEIVER);
  g = gimple_build_call (t, 1, arg);
  gimple_set_location (g, loc);
  gimple_set_block (g, gimple_block (stmt));
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build 'DEST = 1' and insert.  */
  if (dest)
    {
      g = gimple_build_assign (dest, fold_convert_loc (loc, TREE_TYPE (dest),
						       integer_one_node));
      gimple_set_location (g, loc);
      gimple_set_block (g, gimple_block (stmt));
      gsi_insert_before (gsi, g, GSI_SAME_STMT);
    }

  /* Build 'CONT_LABEL:' and insert.  */
  g = gimple_build_label (cont_label);
  gsi_insert_before (gsi, g, GSI_SAME_STMT);

  /* Build orig_dest = dest if necessary.  */
  if (dest != orig_dest)
    {
      g = gimple_build_assign (orig_dest, dest);
      gsi_insert_before (gsi, g, GSI_SAME_STMT);
    }

  /* Remove the call to __builtin_setjmp.  */
  gsi_remove (gsi, false);
}