void
tree_rest_of_compilation (tree fndecl)
{
  location_t saved_loc;

  timevar_push (TV_EXPAND);

  gcc_assert (cgraph_global_info_ready);

  /* Initialize the default bitmap obstack.  */
  bitmap_obstack_initialize (NULL);

  /* Initialize the RTL code for the function.  */
  current_function_decl = fndecl;
  saved_loc = input_location;
  input_location = DECL_SOURCE_LOCATION (fndecl);
  init_function_start (fndecl);

  /* Even though we're inside a function body, we still don't want to
     call expand_expr to calculate the size of a variable-sized array.
     We haven't necessarily assigned RTL to all variables yet, so it's
     not safe to try to expand expressions involving them.  */
  cfun->dont_save_pending_sizes_p = 1;

  gimple_register_cfg_hooks ();

  bitmap_obstack_initialize (&reg_obstack); /* FIXME, only at RTL generation*/

  execute_all_ipa_transforms ();

  /* Perform all tree transforms and optimizations.  */

  /* Signal the start of passes.  */
  invoke_plugin_callbacks (PLUGIN_ALL_PASSES_START, NULL);

  execute_pass_list (all_passes);

  /* Signal the end of passes.  */
  invoke_plugin_callbacks (PLUGIN_ALL_PASSES_END, NULL);

  bitmap_obstack_release (&reg_obstack);

  /* Release the default bitmap obstack.  */
  bitmap_obstack_release (NULL);

  set_cfun (NULL);

  /* If requested, warn about function definitions where the function will
     return a value (usually of some struct or union type) which itself will
     take up a lot of stack space.  */
  if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
    {
      tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));

      if (ret_type && TYPE_SIZE_UNIT (ret_type)
	  && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
	  && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
				   larger_than_size))
	{
	  unsigned int size_as_int
	    = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));

	  if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
	    warning (OPT_Wlarger_than_eq, "size of return value of %q+D is %u bytes",
                     fndecl, size_as_int);
	  else
	    warning (OPT_Wlarger_than_eq, "size of return value of %q+D is larger than %wd bytes",
                     fndecl, larger_than_size);
	}
    }

  gimple_set_body (fndecl, NULL);
  if (DECL_STRUCT_FUNCTION (fndecl) == 0
      && !cgraph_node (fndecl)->origin)
    {
      /* Stop pointing to the local nodes about to be freed.
	 But DECL_INITIAL must remain nonzero so we know this
	 was an actual function definition.
	 For a nested function, this is done in c_pop_function_context.
	 If rest_of_compilation set this to 0, leave it 0.  */
      if (DECL_INITIAL (fndecl) != 0)
	DECL_INITIAL (fndecl) = error_mark_node;
    }

  input_location = saved_loc;

  ggc_collect ();
  timevar_pop (TV_EXPAND);
}
예제 #2
0
static unsigned int
lower_function_body (void)
{
  struct lower_data data;
  gimple_seq body = gimple_body (current_function_decl);
  gimple_seq lowered_body;
  gimple_stmt_iterator i;
  gimple bind;
  gimple x;

  /* The gimplifier should've left a body of exactly one statement,
     namely a GIMPLE_BIND.  */
  gcc_assert (gimple_seq_first (body) == gimple_seq_last (body)
	      && gimple_code (gimple_seq_first_stmt (body)) == GIMPLE_BIND);

  memset (&data, 0, sizeof (data));
  data.block = DECL_INITIAL (current_function_decl);
  BLOCK_SUBBLOCKS (data.block) = NULL_TREE;
  BLOCK_CHAIN (data.block) = NULL_TREE;
  TREE_ASM_WRITTEN (data.block) = 1;
  data.return_statements.create (8);

  bind = gimple_seq_first_stmt (body);
  lowered_body = NULL;
  gimple_seq_add_stmt (&lowered_body, bind);
  i = gsi_start (lowered_body);
  lower_gimple_bind (&i, &data);

  i = gsi_last (lowered_body);

  /* If the function falls off the end, we need a null return statement.
     If we've already got one in the return_statements vector, we don't
     need to do anything special.  Otherwise build one by hand.  */
  if (gimple_seq_may_fallthru (lowered_body)
      && (data.return_statements.is_empty ()
	  || (gimple_return_retval (data.return_statements.last().stmt)
	      != NULL)))
    {
      x = gimple_build_return (NULL);
      gimple_set_location (x, cfun->function_end_locus);
      gimple_set_block (x, DECL_INITIAL (current_function_decl));
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
    }

  /* If we lowered any return statements, emit the representative
     at the end of the function.  */
  while (!data.return_statements.is_empty ())
    {
      return_statements_t t = data.return_statements.pop ();
      x = gimple_build_label (t.label);
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
      gsi_insert_after (&i, t.stmt, GSI_CONTINUE_LINKING);
    }

  /* Once the old body has been lowered, replace it with the new
     lowered sequence.  */
  gimple_set_body (current_function_decl, lowered_body);

  gcc_assert (data.block == DECL_INITIAL (current_function_decl));
  BLOCK_SUBBLOCKS (data.block)
    = blocks_nreverse (BLOCK_SUBBLOCKS (data.block));

  clear_block_marks (data.block);
  data.return_statements.release ();
  return 0;
}
예제 #3
0
파일: gimple-low.c 프로젝트: hnaik/gcc
static unsigned int
lower_function_body (void)
{
  struct lower_data data;
  gimple_seq body = gimple_body (current_function_decl);
  gimple_seq lowered_body;
  gimple_stmt_iterator i;
  gimple bind;
  tree t;
  gimple x;

  /* The gimplifier should've left a body of exactly one statement,
     namely a GIMPLE_BIND.  */
  gcc_assert (gimple_seq_first (body) == gimple_seq_last (body)
	      && gimple_code (gimple_seq_first_stmt (body)) == GIMPLE_BIND);

  memset (&data, 0, sizeof (data));
  data.block = DECL_INITIAL (current_function_decl);
  BLOCK_SUBBLOCKS (data.block) = NULL_TREE;
  BLOCK_CHAIN (data.block) = NULL_TREE;
  TREE_ASM_WRITTEN (data.block) = 1;
  data.return_statements.create (8);

  bind = gimple_seq_first_stmt (body);
  lowered_body = NULL;
  gimple_seq_add_stmt (&lowered_body, bind);
  i = gsi_start (lowered_body);
  lower_gimple_bind (&i, &data);

  i = gsi_last (lowered_body);

  /* If the function falls off the end, we need a null return statement.
     If we've already got one in the return_statements vector, we don't
     need to do anything special.  Otherwise build one by hand.  */
  if (gimple_seq_may_fallthru (lowered_body)
      && (data.return_statements.is_empty ()
	  || gimple_return_retval (data.return_statements.last().stmt) != NULL))
    {
      x = gimple_build_return (NULL);
      gimple_set_location (x, cfun->function_end_locus);
      gimple_set_block (x, DECL_INITIAL (current_function_decl));
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
    }

  /* If we lowered any return statements, emit the representative
     at the end of the function.  */
  while (!data.return_statements.is_empty ())
    {
      return_statements_t t = data.return_statements.pop ();
      x = gimple_build_label (t.label);
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
      gsi_insert_after (&i, t.stmt, GSI_CONTINUE_LINKING);
    }

  /* If the function calls __builtin_setjmp, we need to emit the computed
     goto that will serve as the unique dispatcher for all the receivers.  */
  if (data.calls_builtin_setjmp)
    {
      tree disp_label, disp_var, arg;

      /* Build 'DISP_LABEL:' and insert.  */
      disp_label = create_artificial_label (cfun->function_end_locus);
      /* This mark will create forward edges from every call site.  */
      DECL_NONLOCAL (disp_label) = 1;
      cfun->has_nonlocal_label = 1;
      x = gimple_build_label (disp_label);
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);

      /* Build 'DISP_VAR = __builtin_setjmp_dispatcher (DISP_LABEL);'
	 and insert.  */
      disp_var = create_tmp_var (ptr_type_node, "setjmpvar");
      arg = build_addr (disp_label, current_function_decl);
      t = builtin_decl_implicit (BUILT_IN_SETJMP_DISPATCHER);
      x = gimple_build_call (t, 1, arg);
      gimple_call_set_lhs (x, disp_var);

      /* Build 'goto DISP_VAR;' and insert.  */
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
      x = gimple_build_goto (disp_var);
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
    }

  /* Once the old body has been lowered, replace it with the new
     lowered sequence.  */
  gimple_set_body (current_function_decl, lowered_body);

  gcc_assert (data.block == DECL_INITIAL (current_function_decl));
  BLOCK_SUBBLOCKS (data.block)
    = blocks_nreverse (BLOCK_SUBBLOCKS (data.block));

  clear_block_marks (data.block);
  data.return_statements.release ();
  return 0;
}
예제 #4
0
파일: gimple-low.c 프로젝트: KangDroid/gcc
static unsigned int
lower_function_body (void)
{
  struct lower_data data;
  gimple_seq body = gimple_body (current_function_decl);
  gimple_seq lowered_body;
  gimple_stmt_iterator i;
  gimple *bind;
  gimple *x;

  /* The gimplifier should've left a body of exactly one statement,
     namely a GIMPLE_BIND.  */
  gcc_assert (gimple_seq_first (body) == gimple_seq_last (body)
	      && gimple_code (gimple_seq_first_stmt (body)) == GIMPLE_BIND);

  memset (&data, 0, sizeof (data));
  data.block = DECL_INITIAL (current_function_decl);
  BLOCK_SUBBLOCKS (data.block) = NULL_TREE;
  BLOCK_CHAIN (data.block) = NULL_TREE;
  TREE_ASM_WRITTEN (data.block) = 1;
  data.return_statements.create (8);

  bind = gimple_seq_first_stmt (body);
  lowered_body = NULL;
  gimple_seq_add_stmt (&lowered_body, bind);
  i = gsi_start (lowered_body);
  lower_gimple_bind (&i, &data);

  i = gsi_last (lowered_body);

  /* If we had begin stmt markers from e.g. PCH, but this compilation
     doesn't want them, lower_stmt will have cleaned them up; we can
     now clear the flag that indicates we had them.  */
  if (!MAY_HAVE_DEBUG_MARKER_STMTS && cfun->debug_nonbind_markers)
    {
      /* This counter needs not be exact, but before lowering it will
	 most certainly be.  */
      gcc_assert (cfun->debug_marker_count == 0);
      cfun->debug_nonbind_markers = false;
    }

  /* If the function falls off the end, we need a null return statement.
     If we've already got one in the return_statements vector, we don't
     need to do anything special.  Otherwise build one by hand.  */
  bool may_fallthru = gimple_seq_may_fallthru (lowered_body);
  if (may_fallthru
      && (data.return_statements.is_empty ()
	  || (gimple_return_retval (data.return_statements.last().stmt)
	      != NULL)))
    {
      x = gimple_build_return (NULL);
      gimple_set_location (x, cfun->function_end_locus);
      gimple_set_block (x, DECL_INITIAL (current_function_decl));
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
      may_fallthru = false;
    }

  /* If we lowered any return statements, emit the representative
     at the end of the function.  */
  while (!data.return_statements.is_empty ())
    {
      return_statements_t t = data.return_statements.pop ();
      x = gimple_build_label (t.label);
      gsi_insert_after (&i, x, GSI_CONTINUE_LINKING);
      gsi_insert_after (&i, t.stmt, GSI_CONTINUE_LINKING);
      if (may_fallthru)
	{
	  /* Remove the line number from the representative return statement.
	     It now fills in for the fallthru too.  Failure to remove this
	     will result in incorrect results for coverage analysis.  */
	  gimple_set_location (t.stmt, UNKNOWN_LOCATION);
	  may_fallthru = false;
	}
    }

  /* Once the old body has been lowered, replace it with the new
     lowered sequence.  */
  gimple_set_body (current_function_decl, lowered_body);

  gcc_assert (data.block == DECL_INITIAL (current_function_decl));
  BLOCK_SUBBLOCKS (data.block)
    = blocks_nreverse (BLOCK_SUBBLOCKS (data.block));

  clear_block_marks (data.block);
  data.return_statements.release ();
  return 0;
}