/* Functions dealing with attribute handling, used by most front ends.
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/* Functions dealing with attribute handling, used by most front ends.
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Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
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Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
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2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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|
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This file is part of GCC.
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This file is part of GCC.
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|
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GCC is free software; you can redistribute it and/or modify it under
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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Software Foundation; either version 3, or (at your option) any later
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version.
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version.
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|
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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for more details.
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|
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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<http://www.gnu.org/licenses/>. */
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|
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#include "config.h"
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#include "config.h"
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#include "system.h"
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#include "system.h"
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#include "coretypes.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tm.h"
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#include "tree.h"
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#include "tree.h"
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#include "flags.h"
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#include "flags.h"
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#include "toplev.h"
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#include "toplev.h"
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#include "output.h"
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#include "output.h"
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#include "rtl.h"
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#include "rtl.h"
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#include "ggc.h"
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#include "ggc.h"
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#include "tm_p.h"
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#include "tm_p.h"
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#include "cpplib.h"
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#include "cpplib.h"
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#include "target.h"
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#include "target.h"
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#include "langhooks.h"
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#include "langhooks.h"
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|
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static void init_attributes (void);
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static void init_attributes (void);
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/* Table of the tables of attributes (common, language, format, machine)
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/* Table of the tables of attributes (common, language, format, machine)
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searched. */
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searched. */
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static const struct attribute_spec *attribute_tables[4];
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static const struct attribute_spec *attribute_tables[4];
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|
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static bool attributes_initialized = false;
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static bool attributes_initialized = false;
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|
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/* Default empty table of attributes. */
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/* Default empty table of attributes. */
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static const struct attribute_spec empty_attribute_table[] =
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static const struct attribute_spec empty_attribute_table[] =
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{
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{
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{ NULL, 0, 0, false, false, false, NULL }
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{ NULL, 0, 0, false, false, false, NULL }
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};
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};
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|
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/* Initialize attribute tables, and make some sanity checks
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/* Initialize attribute tables, and make some sanity checks
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if --enable-checking. */
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if --enable-checking. */
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|
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static void
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static void
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init_attributes (void)
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init_attributes (void)
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{
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{
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size_t i;
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size_t i;
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|
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attribute_tables[0] = lang_hooks.common_attribute_table;
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attribute_tables[0] = lang_hooks.common_attribute_table;
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attribute_tables[1] = lang_hooks.attribute_table;
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attribute_tables[1] = lang_hooks.attribute_table;
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attribute_tables[2] = lang_hooks.format_attribute_table;
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attribute_tables[2] = lang_hooks.format_attribute_table;
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attribute_tables[3] = targetm.attribute_table;
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attribute_tables[3] = targetm.attribute_table;
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|
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/* Translate NULL pointers to pointers to the empty table. */
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/* Translate NULL pointers to pointers to the empty table. */
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for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
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for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
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if (attribute_tables[i] == NULL)
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if (attribute_tables[i] == NULL)
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attribute_tables[i] = empty_attribute_table;
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attribute_tables[i] = empty_attribute_table;
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|
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#ifdef ENABLE_CHECKING
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#ifdef ENABLE_CHECKING
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/* Make some sanity checks on the attribute tables. */
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/* Make some sanity checks on the attribute tables. */
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for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
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for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
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{
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{
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int j;
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int j;
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|
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for (j = 0; attribute_tables[i][j].name != NULL; j++)
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for (j = 0; attribute_tables[i][j].name != NULL; j++)
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{
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{
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/* The name must not begin and end with __. */
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/* The name must not begin and end with __. */
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const char *name = attribute_tables[i][j].name;
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const char *name = attribute_tables[i][j].name;
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int len = strlen (name);
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int len = strlen (name);
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|
|
gcc_assert (!(name[0] == '_' && name[1] == '_'
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gcc_assert (!(name[0] == '_' && name[1] == '_'
|
&& name[len - 1] == '_' && name[len - 2] == '_'));
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&& name[len - 1] == '_' && name[len - 2] == '_'));
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|
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/* The minimum and maximum lengths must be consistent. */
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/* The minimum and maximum lengths must be consistent. */
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gcc_assert (attribute_tables[i][j].min_length >= 0);
|
gcc_assert (attribute_tables[i][j].min_length >= 0);
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|
|
gcc_assert (attribute_tables[i][j].max_length == -1
|
gcc_assert (attribute_tables[i][j].max_length == -1
|
|| (attribute_tables[i][j].max_length
|
|| (attribute_tables[i][j].max_length
|
>= attribute_tables[i][j].min_length));
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>= attribute_tables[i][j].min_length));
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|
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/* An attribute cannot require both a DECL and a TYPE. */
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/* An attribute cannot require both a DECL and a TYPE. */
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gcc_assert (!attribute_tables[i][j].decl_required
|
gcc_assert (!attribute_tables[i][j].decl_required
|
|| !attribute_tables[i][j].type_required);
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|| !attribute_tables[i][j].type_required);
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|
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/* If an attribute requires a function type, in particular
|
/* If an attribute requires a function type, in particular
|
it requires a type. */
|
it requires a type. */
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gcc_assert (!attribute_tables[i][j].function_type_required
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gcc_assert (!attribute_tables[i][j].function_type_required
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|| attribute_tables[i][j].type_required);
|
|| attribute_tables[i][j].type_required);
|
}
|
}
|
}
|
}
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|
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/* Check that each name occurs just once in each table. */
|
/* Check that each name occurs just once in each table. */
|
for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
|
for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
|
{
|
{
|
int j, k;
|
int j, k;
|
for (j = 0; attribute_tables[i][j].name != NULL; j++)
|
for (j = 0; attribute_tables[i][j].name != NULL; j++)
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for (k = j + 1; attribute_tables[i][k].name != NULL; k++)
|
for (k = j + 1; attribute_tables[i][k].name != NULL; k++)
|
gcc_assert (strcmp (attribute_tables[i][j].name,
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gcc_assert (strcmp (attribute_tables[i][j].name,
|
attribute_tables[i][k].name));
|
attribute_tables[i][k].name));
|
}
|
}
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/* Check that no name occurs in more than one table. */
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/* Check that no name occurs in more than one table. */
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for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
|
for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
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{
|
{
|
size_t j, k, l;
|
size_t j, k, l;
|
|
|
for (j = i + 1; j < ARRAY_SIZE (attribute_tables); j++)
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for (j = i + 1; j < ARRAY_SIZE (attribute_tables); j++)
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for (k = 0; attribute_tables[i][k].name != NULL; k++)
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for (k = 0; attribute_tables[i][k].name != NULL; k++)
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for (l = 0; attribute_tables[j][l].name != NULL; l++)
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for (l = 0; attribute_tables[j][l].name != NULL; l++)
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gcc_assert (strcmp (attribute_tables[i][k].name,
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gcc_assert (strcmp (attribute_tables[i][k].name,
|
attribute_tables[j][l].name));
|
attribute_tables[j][l].name));
|
}
|
}
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#endif
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#endif
|
|
|
attributes_initialized = true;
|
attributes_initialized = true;
|
}
|
}
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|
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/* Process the attributes listed in ATTRIBUTES and install them in *NODE,
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/* Process the attributes listed in ATTRIBUTES and install them in *NODE,
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which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL,
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which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL,
|
it should be modified in place; if a TYPE, a copy should be created
|
it should be modified in place; if a TYPE, a copy should be created
|
unless ATTR_FLAG_TYPE_IN_PLACE is set in FLAGS. FLAGS gives further
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unless ATTR_FLAG_TYPE_IN_PLACE is set in FLAGS. FLAGS gives further
|
information, in the form of a bitwise OR of flags in enum attribute_flags
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information, in the form of a bitwise OR of flags in enum attribute_flags
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from tree.h. Depending on these flags, some attributes may be
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from tree.h. Depending on these flags, some attributes may be
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returned to be applied at a later stage (for example, to apply
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returned to be applied at a later stage (for example, to apply
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a decl attribute to the declaration rather than to its type). */
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a decl attribute to the declaration rather than to its type). */
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|
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tree
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tree
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decl_attributes (tree *node, tree attributes, int flags)
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decl_attributes (tree *node, tree attributes, int flags)
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{
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{
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tree a;
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tree a;
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tree returned_attrs = NULL_TREE;
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tree returned_attrs = NULL_TREE;
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|
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if (!attributes_initialized)
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if (!attributes_initialized)
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init_attributes ();
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init_attributes ();
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targetm.insert_attributes (*node, &attributes);
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targetm.insert_attributes (*node, &attributes);
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for (a = attributes; a; a = TREE_CHAIN (a))
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for (a = attributes; a; a = TREE_CHAIN (a))
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{
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{
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tree name = TREE_PURPOSE (a);
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tree name = TREE_PURPOSE (a);
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tree args = TREE_VALUE (a);
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tree args = TREE_VALUE (a);
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tree *anode = node;
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tree *anode = node;
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const struct attribute_spec *spec = NULL;
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const struct attribute_spec *spec = NULL;
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bool no_add_attrs = 0;
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bool no_add_attrs = 0;
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tree fn_ptr_tmp = NULL_TREE;
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tree fn_ptr_tmp = NULL_TREE;
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size_t i;
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size_t i;
|
|
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for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
|
for (i = 0; i < ARRAY_SIZE (attribute_tables); i++)
|
{
|
{
|
int j;
|
int j;
|
|
|
for (j = 0; attribute_tables[i][j].name != NULL; j++)
|
for (j = 0; attribute_tables[i][j].name != NULL; j++)
|
{
|
{
|
if (is_attribute_p (attribute_tables[i][j].name, name))
|
if (is_attribute_p (attribute_tables[i][j].name, name))
|
{
|
{
|
spec = &attribute_tables[i][j];
|
spec = &attribute_tables[i][j];
|
break;
|
break;
|
}
|
}
|
}
|
}
|
if (spec != NULL)
|
if (spec != NULL)
|
break;
|
break;
|
}
|
}
|
|
|
if (spec == NULL)
|
if (spec == NULL)
|
{
|
{
|
warning (OPT_Wattributes, "%qs attribute directive ignored",
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warning (OPT_Wattributes, "%qs attribute directive ignored",
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IDENTIFIER_POINTER (name));
|
IDENTIFIER_POINTER (name));
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continue;
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continue;
|
}
|
}
|
else if (list_length (args) < spec->min_length
|
else if (list_length (args) < spec->min_length
|
|| (spec->max_length >= 0
|
|| (spec->max_length >= 0
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&& list_length (args) > spec->max_length))
|
&& list_length (args) > spec->max_length))
|
{
|
{
|
error ("wrong number of arguments specified for %qs attribute",
|
error ("wrong number of arguments specified for %qs attribute",
|
IDENTIFIER_POINTER (name));
|
IDENTIFIER_POINTER (name));
|
continue;
|
continue;
|
}
|
}
|
|
|
if (spec->decl_required && !DECL_P (*anode))
|
if (spec->decl_required && !DECL_P (*anode))
|
{
|
{
|
if (flags & ((int) ATTR_FLAG_DECL_NEXT
|
if (flags & ((int) ATTR_FLAG_DECL_NEXT
|
| (int) ATTR_FLAG_FUNCTION_NEXT
|
| (int) ATTR_FLAG_FUNCTION_NEXT
|
| (int) ATTR_FLAG_ARRAY_NEXT))
|
| (int) ATTR_FLAG_ARRAY_NEXT))
|
{
|
{
|
/* Pass on this attribute to be tried again. */
|
/* Pass on this attribute to be tried again. */
|
returned_attrs = tree_cons (name, args, returned_attrs);
|
returned_attrs = tree_cons (name, args, returned_attrs);
|
continue;
|
continue;
|
}
|
}
|
else
|
else
|
{
|
{
|
warning (OPT_Wattributes, "%qs attribute does not apply to types",
|
warning (OPT_Wattributes, "%qs attribute does not apply to types",
|
IDENTIFIER_POINTER (name));
|
IDENTIFIER_POINTER (name));
|
continue;
|
continue;
|
}
|
}
|
}
|
}
|
|
|
/* If we require a type, but were passed a decl, set up to make a
|
/* If we require a type, but were passed a decl, set up to make a
|
new type and update the one in the decl. ATTR_FLAG_TYPE_IN_PLACE
|
new type and update the one in the decl. ATTR_FLAG_TYPE_IN_PLACE
|
would have applied if we'd been passed a type, but we cannot modify
|
would have applied if we'd been passed a type, but we cannot modify
|
the decl's type in place here. */
|
the decl's type in place here. */
|
if (spec->type_required && DECL_P (*anode))
|
if (spec->type_required && DECL_P (*anode))
|
{
|
{
|
anode = &TREE_TYPE (*anode);
|
anode = &TREE_TYPE (*anode);
|
flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE;
|
flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE;
|
}
|
}
|
|
|
if (spec->function_type_required && TREE_CODE (*anode) != FUNCTION_TYPE
|
if (spec->function_type_required && TREE_CODE (*anode) != FUNCTION_TYPE
|
&& TREE_CODE (*anode) != METHOD_TYPE)
|
&& TREE_CODE (*anode) != METHOD_TYPE)
|
{
|
{
|
if (TREE_CODE (*anode) == POINTER_TYPE
|
if (TREE_CODE (*anode) == POINTER_TYPE
|
&& (TREE_CODE (TREE_TYPE (*anode)) == FUNCTION_TYPE
|
&& (TREE_CODE (TREE_TYPE (*anode)) == FUNCTION_TYPE
|
|| TREE_CODE (TREE_TYPE (*anode)) == METHOD_TYPE))
|
|| TREE_CODE (TREE_TYPE (*anode)) == METHOD_TYPE))
|
{
|
{
|
/* OK, this is a bit convoluted. We can't just make a copy
|
/* OK, this is a bit convoluted. We can't just make a copy
|
of the pointer type and modify its TREE_TYPE, because if
|
of the pointer type and modify its TREE_TYPE, because if
|
we change the attributes of the target type the pointer
|
we change the attributes of the target type the pointer
|
type needs to have a different TYPE_MAIN_VARIANT. So we
|
type needs to have a different TYPE_MAIN_VARIANT. So we
|
pull out the target type now, frob it as appropriate, and
|
pull out the target type now, frob it as appropriate, and
|
rebuild the pointer type later.
|
rebuild the pointer type later.
|
|
|
This would all be simpler if attributes were part of the
|
This would all be simpler if attributes were part of the
|
declarator, grumble grumble. */
|
declarator, grumble grumble. */
|
fn_ptr_tmp = TREE_TYPE (*anode);
|
fn_ptr_tmp = TREE_TYPE (*anode);
|
anode = &fn_ptr_tmp;
|
anode = &fn_ptr_tmp;
|
flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE;
|
flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE;
|
}
|
}
|
else if (flags & (int) ATTR_FLAG_FUNCTION_NEXT)
|
else if (flags & (int) ATTR_FLAG_FUNCTION_NEXT)
|
{
|
{
|
/* Pass on this attribute to be tried again. */
|
/* Pass on this attribute to be tried again. */
|
returned_attrs = tree_cons (name, args, returned_attrs);
|
returned_attrs = tree_cons (name, args, returned_attrs);
|
continue;
|
continue;
|
}
|
}
|
|
|
if (TREE_CODE (*anode) != FUNCTION_TYPE
|
if (TREE_CODE (*anode) != FUNCTION_TYPE
|
&& TREE_CODE (*anode) != METHOD_TYPE)
|
&& TREE_CODE (*anode) != METHOD_TYPE)
|
{
|
{
|
warning (OPT_Wattributes,
|
warning (OPT_Wattributes,
|
"%qs attribute only applies to function types",
|
"%qs attribute only applies to function types",
|
IDENTIFIER_POINTER (name));
|
IDENTIFIER_POINTER (name));
|
continue;
|
continue;
|
}
|
}
|
}
|
}
|
|
|
if (TYPE_P (*anode)
|
if (TYPE_P (*anode)
|
&& (flags & (int) ATTR_FLAG_TYPE_IN_PLACE)
|
&& (flags & (int) ATTR_FLAG_TYPE_IN_PLACE)
|
&& TYPE_SIZE (*anode) != NULL_TREE)
|
&& TYPE_SIZE (*anode) != NULL_TREE)
|
{
|
{
|
warning (OPT_Wattributes, "type attributes ignored after type is already defined");
|
warning (OPT_Wattributes, "type attributes ignored after type is already defined");
|
continue;
|
continue;
|
}
|
}
|
|
|
if (spec->handler != NULL)
|
if (spec->handler != NULL)
|
returned_attrs = chainon ((*spec->handler) (anode, name, args,
|
returned_attrs = chainon ((*spec->handler) (anode, name, args,
|
flags, &no_add_attrs),
|
flags, &no_add_attrs),
|
returned_attrs);
|
returned_attrs);
|
|
|
/* Layout the decl in case anything changed. */
|
/* Layout the decl in case anything changed. */
|
if (spec->type_required && DECL_P (*node)
|
if (spec->type_required && DECL_P (*node)
|
&& (TREE_CODE (*node) == VAR_DECL
|
&& (TREE_CODE (*node) == VAR_DECL
|
|| TREE_CODE (*node) == PARM_DECL
|
|| TREE_CODE (*node) == PARM_DECL
|
|| TREE_CODE (*node) == RESULT_DECL))
|
|| TREE_CODE (*node) == RESULT_DECL))
|
relayout_decl (*node);
|
relayout_decl (*node);
|
|
|
if (!no_add_attrs)
|
if (!no_add_attrs)
|
{
|
{
|
tree old_attrs;
|
tree old_attrs;
|
tree a;
|
tree a;
|
|
|
if (DECL_P (*anode))
|
if (DECL_P (*anode))
|
old_attrs = DECL_ATTRIBUTES (*anode);
|
old_attrs = DECL_ATTRIBUTES (*anode);
|
else
|
else
|
old_attrs = TYPE_ATTRIBUTES (*anode);
|
old_attrs = TYPE_ATTRIBUTES (*anode);
|
|
|
for (a = lookup_attribute (spec->name, old_attrs);
|
for (a = lookup_attribute (spec->name, old_attrs);
|
a != NULL_TREE;
|
a != NULL_TREE;
|
a = lookup_attribute (spec->name, TREE_CHAIN (a)))
|
a = lookup_attribute (spec->name, TREE_CHAIN (a)))
|
{
|
{
|
if (simple_cst_equal (TREE_VALUE (a), args) == 1)
|
if (simple_cst_equal (TREE_VALUE (a), args) == 1)
|
break;
|
break;
|
}
|
}
|
|
|
if (a == NULL_TREE)
|
if (a == NULL_TREE)
|
{
|
{
|
/* This attribute isn't already in the list. */
|
/* This attribute isn't already in the list. */
|
if (DECL_P (*anode))
|
if (DECL_P (*anode))
|
DECL_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs);
|
DECL_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs);
|
else if (flags & (int) ATTR_FLAG_TYPE_IN_PLACE)
|
else if (flags & (int) ATTR_FLAG_TYPE_IN_PLACE)
|
{
|
{
|
TYPE_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs);
|
TYPE_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs);
|
/* If this is the main variant, also push the attributes
|
/* If this is the main variant, also push the attributes
|
out to the other variants. */
|
out to the other variants. */
|
if (*anode == TYPE_MAIN_VARIANT (*anode))
|
if (*anode == TYPE_MAIN_VARIANT (*anode))
|
{
|
{
|
tree variant;
|
tree variant;
|
for (variant = *anode; variant;
|
for (variant = *anode; variant;
|
variant = TYPE_NEXT_VARIANT (variant))
|
variant = TYPE_NEXT_VARIANT (variant))
|
{
|
{
|
if (TYPE_ATTRIBUTES (variant) == old_attrs)
|
if (TYPE_ATTRIBUTES (variant) == old_attrs)
|
TYPE_ATTRIBUTES (variant)
|
TYPE_ATTRIBUTES (variant)
|
= TYPE_ATTRIBUTES (*anode);
|
= TYPE_ATTRIBUTES (*anode);
|
else if (!lookup_attribute
|
else if (!lookup_attribute
|
(spec->name, TYPE_ATTRIBUTES (variant)))
|
(spec->name, TYPE_ATTRIBUTES (variant)))
|
TYPE_ATTRIBUTES (variant) = tree_cons
|
TYPE_ATTRIBUTES (variant) = tree_cons
|
(name, args, TYPE_ATTRIBUTES (variant));
|
(name, args, TYPE_ATTRIBUTES (variant));
|
}
|
}
|
}
|
}
|
}
|
}
|
else
|
else
|
*anode = build_type_attribute_variant (*anode,
|
*anode = build_type_attribute_variant (*anode,
|
tree_cons (name, args,
|
tree_cons (name, args,
|
old_attrs));
|
old_attrs));
|
}
|
}
|
}
|
}
|
|
|
if (fn_ptr_tmp)
|
if (fn_ptr_tmp)
|
{
|
{
|
/* Rebuild the function pointer type and put it in the
|
/* Rebuild the function pointer type and put it in the
|
appropriate place. */
|
appropriate place. */
|
fn_ptr_tmp = build_pointer_type (fn_ptr_tmp);
|
fn_ptr_tmp = build_pointer_type (fn_ptr_tmp);
|
if (DECL_P (*node))
|
if (DECL_P (*node))
|
TREE_TYPE (*node) = fn_ptr_tmp;
|
TREE_TYPE (*node) = fn_ptr_tmp;
|
else
|
else
|
{
|
{
|
gcc_assert (TREE_CODE (*node) == POINTER_TYPE);
|
gcc_assert (TREE_CODE (*node) == POINTER_TYPE);
|
*node = fn_ptr_tmp;
|
*node = fn_ptr_tmp;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
return returned_attrs;
|
return returned_attrs;
|
}
|
}
|
|
|
