diff options
author | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-09-22 13:14:40 +0000 |
---|---|---|
committer | kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-09-22 13:14:40 +0000 |
commit | e3f6ce11a5d61c1b8f636199ab69cae6c4ee3bae (patch) | |
tree | 00bc4e0b093a48235bf0c46b6102755bcd06cba0 /gcc/attribs.c | |
parent | 90b1355d457745b69069ff403d4a4927f72aa8f4 (diff) | |
download | ppe42-gcc-e3f6ce11a5d61c1b8f636199ab69cae6c4ee3bae.tar.gz ppe42-gcc-e3f6ce11a5d61c1b8f636199ab69cae6c4ee3bae.zip |
* attribs.c: New file, from c-common.c.
(attribute_tables): Now four elements.
(format_attribute_table, lang_attribute_common): New variables.
(init_attributes): Reflect above changes.
(handle_mode_attribute): Delete check for wider than uintmax.
* c-common.c: Delete parts moved to attribs.c.
(enum attrs): Deleted; unused.
(c_format_attribute_table): New variable.
(c_common_lang_init): Initialize format_attribute_table with it.
* c-common.h (decl_attributes): Remove decl.
* tree.h (decl_attribute): Move it to here.
* Makefile.in (C_AND_OBJS_OBJS): Add attribs.o.
(attribs.o): New rule.
* ch/Make-lang.in (cc1chill): Add attribs.o.
* cp/Make-lang.in (CXX_C_OBJS): Add attribs.o.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45749 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/attribs.c')
-rw-r--r-- | gcc/attribs.c | 1201 |
1 files changed, 1201 insertions, 0 deletions
diff --git a/gcc/attribs.c b/gcc/attribs.c new file mode 100644 index 00000000000..1413dc267f9 --- /dev/null +++ b/gcc/attribs.c @@ -0,0 +1,1201 @@ +/* Functions dealing with attribute handling, used by most front ends. + Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 + Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 2, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING. If not, write to the Free +Software Foundation, 59 Temple Place - Suite 330, Boston, MA +02111-1307, USA. */ + +#include "config.h" +#include "system.h" +#include "tree.h" +#include "flags.h" +#include "toplev.h" +#include "output.h" +#include "rtl.h" +#include "ggc.h" +#include "expr.h" +#include "tm_p.h" +#include "obstack.h" +#include "cpplib.h" +#include "target.h" + +static void init_attributes PARAMS ((void)); + +/* Table of the tables of attributes (common, format, language, machine) + searched. */ +static const struct attribute_spec *attribute_tables[4]; + +static bool attributes_initialized = false; + +static tree handle_packed_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_nocommon_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_common_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_noreturn_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_unused_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_const_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_transparent_union_attribute PARAMS ((tree *, tree, tree, + int, bool *)); +static tree handle_constructor_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_destructor_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_mode_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_section_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_aligned_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_weak_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_alias_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_no_instrument_function_attribute PARAMS ((tree *, tree, + tree, int, + bool *)); +static tree handle_no_check_memory_usage_attribute PARAMS ((tree *, tree, tree, + int, bool *)); +static tree handle_malloc_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_no_limit_stack_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_pure_attribute PARAMS ((tree *, tree, tree, int, + bool *)); + +/* Table of machine-independent attributes common to all C-like languages. */ +static const struct attribute_spec c_common_attribute_table[] = +{ + /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ + { "packed", 0, 0, false, false, false, + handle_packed_attribute }, + { "nocommon", 0, 0, true, false, false, + handle_nocommon_attribute }, + { "common", 0, 0, true, false, false, + handle_common_attribute }, + /* FIXME: logically, noreturn attributes should be listed as + "false, true, true" and apply to function types. But implementing this + would require all the places in the compiler that use TREE_THIS_VOLATILE + on a decl to identify non-returning functions to be located and fixed + to check the function type instead. */ + { "noreturn", 0, 0, true, false, false, + handle_noreturn_attribute }, + { "volatile", 0, 0, true, false, false, + handle_noreturn_attribute }, + { "unused", 0, 0, false, false, false, + handle_unused_attribute }, + /* The same comments as for noreturn attributes apply to const ones. */ + { "const", 0, 0, true, false, false, + handle_const_attribute }, + { "transparent_union", 0, 0, false, false, false, + handle_transparent_union_attribute }, + { "constructor", 0, 0, true, false, false, + handle_constructor_attribute }, + { "destructor", 0, 0, true, false, false, + handle_destructor_attribute }, + { "mode", 1, 1, true, false, false, + handle_mode_attribute }, + { "section", 1, 1, true, false, false, + handle_section_attribute }, + { "aligned", 0, 1, false, false, false, + handle_aligned_attribute }, + { "weak", 0, 0, true, false, false, + handle_weak_attribute }, + { "alias", 1, 1, true, false, false, + handle_alias_attribute }, + { "no_instrument_function", 0, 0, true, false, false, + handle_no_instrument_function_attribute }, + { "no_check_memory_usage", 0, 0, true, false, false, + handle_no_check_memory_usage_attribute }, + { "malloc", 0, 0, true, false, false, + handle_malloc_attribute }, + { "no_stack_limit", 0, 0, true, false, false, + handle_no_limit_stack_attribute }, + { "pure", 0, 0, true, false, false, + handle_pure_attribute }, + { NULL, 0, 0, false, false, false, NULL } +}; + +/* Default empty table of attributes. */ +static const struct attribute_spec empty_attribute_table[] = +{ + { NULL, 0, 0, false, false, false, NULL } +}; + +/* Table of machine-independent attributes for checking formats, if used. */ +const struct attribute_spec *format_attribute_table = empty_attribute_table; + +/* Table of machine-independent attributes for a particular language. */ +const struct attribute_spec *lang_attribute_table = empty_attribute_table; + +/* Flag saying whether common language attributes are to be supported. */ +int lang_attribute_common = 1; + +/* Initialize attribute tables, and make some sanity checks + if --enable-checking. */ + +static void +init_attributes () +{ +#ifdef ENABLE_CHECKING + int i; +#endif + + attribute_tables[0] + = lang_attribute_common ? c_common_attribute_table : empty_attribute_table; + attribute_tables[1] = lang_attribute_table; + attribute_tables[2] = format_attribute_table; + attribute_tables[3] = targetm.attribute_table; + +#ifdef ENABLE_CHECKING + /* Make some sanity checks on the attribute tables. */ + for (i = 0; + i < (int) (sizeof (attribute_tables) / sizeof (attribute_tables[0])); + i++) + { + int j; + + for (j = 0; attribute_tables[i][j].name != NULL; j++) + { + /* The name must not begin and end with __. */ + const char *name = attribute_tables[i][j].name; + int len = strlen (name); + if (name[0] == '_' && name[1] == '_' + && name[len - 1] == '_' && name[len - 2] == '_') + abort (); + /* The minimum and maximum lengths must be consistent. */ + if (attribute_tables[i][j].min_length < 0) + abort (); + if (attribute_tables[i][j].max_length != -1 + && (attribute_tables[i][j].max_length + < attribute_tables[i][j].min_length)) + abort (); + /* An attribute cannot require both a DECL and a TYPE. */ + if (attribute_tables[i][j].decl_required + && attribute_tables[i][j].type_required) + abort (); + /* If an attribute requires a function type, in particular + it requires a type. */ + if (attribute_tables[i][j].function_type_required + && !attribute_tables[i][j].type_required) + abort (); + } + } + + /* Check that each name occurs just once in each table. */ + for (i = 0; + i < (int) (sizeof (attribute_tables) / sizeof (attribute_tables[0])); + i++) + { + int j, k; + for (j = 0; attribute_tables[i][j].name != NULL; j++) + for (k = j + 1; attribute_tables[i][k].name != NULL; k++) + if (!strcmp (attribute_tables[i][j].name, + attribute_tables[i][k].name)) + abort (); + } + /* Check that no name occurs in more than one table. */ + for (i = 0; + i < (int) (sizeof (attribute_tables) / sizeof (attribute_tables[0])); + i++) + { + int j, k, l; + + for (j = i + 1; + j < ((int) (sizeof (attribute_tables) + / sizeof (attribute_tables[0]))); + j++) + for (k = 0; attribute_tables[i][k].name != NULL; k++) + for (l = 0; attribute_tables[j][l].name != NULL; l++) + if (!strcmp (attribute_tables[i][k].name, + attribute_tables[j][l].name)) + abort (); + } +#endif + + attributes_initialized = true; +} + +/* Process the attributes listed in ATTRIBUTES and install them in *NODE, + 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 + 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 + from tree.h. Depending on these flags, some attributes may be + returned to be applied at a later stage (for example, to apply + a decl attribute to the declaration rather than to its type). */ + +tree +decl_attributes (node, attributes, flags) + tree *node, attributes; + int flags; +{ + tree a; + tree returned_attrs = NULL_TREE; + + if (!attributes_initialized) + init_attributes (); + + (*targetm.insert_attributes) (*node, &attributes); + + for (a = attributes; a; a = TREE_CHAIN (a)) + { + tree name = TREE_PURPOSE (a); + tree args = TREE_VALUE (a); + tree *anode = node; + const struct attribute_spec *spec = NULL; + bool no_add_attrs = 0; + int i; + + for (i = 0; + i < ((int) (sizeof (attribute_tables) + / sizeof (attribute_tables[0]))); + i++) + { + int j; + + for (j = 0; attribute_tables[i][j].name != NULL; j++) + { + if (is_attribute_p (attribute_tables[i][j].name, name)) + { + spec = &attribute_tables[i][j]; + break; + } + } + if (spec != NULL) + break; + } + + if (spec == NULL) + { + warning ("`%s' attribute directive ignored", + IDENTIFIER_POINTER (name)); + continue; + } + else if (list_length (args) < spec->min_length + || (spec->max_length >= 0 + && list_length (args) > spec->max_length)) + { + error ("wrong number of arguments specified for `%s' attribute", + IDENTIFIER_POINTER (name)); + continue; + } + + if (spec->decl_required && !DECL_P (*anode)) + { + if (flags & ((int) ATTR_FLAG_DECL_NEXT + | (int) ATTR_FLAG_FUNCTION_NEXT + | (int) ATTR_FLAG_ARRAY_NEXT)) + { + /* Pass on this attribute to be tried again. */ + returned_attrs = tree_cons (name, args, returned_attrs); + continue; + } + else + { + warning ("`%s' attribute does not apply to types", + IDENTIFIER_POINTER (name)); + continue; + } + } + + if (spec->type_required && DECL_P (*anode)) + anode = &TREE_TYPE (*anode); + + if (spec->function_type_required && TREE_CODE (*anode) != FUNCTION_TYPE + && TREE_CODE (*anode) != METHOD_TYPE) + { + if (TREE_CODE (*anode) == POINTER_TYPE + && (TREE_CODE (TREE_TYPE (*anode)) == FUNCTION_TYPE + || TREE_CODE (TREE_TYPE (*anode)) == METHOD_TYPE)) + { + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *anode = build_type_copy (*anode); + anode = &TREE_TYPE (*anode); + } + else if (flags & (int) ATTR_FLAG_FUNCTION_NEXT) + { + /* Pass on this attribute to be tried again. */ + returned_attrs = tree_cons (name, args, returned_attrs); + continue; + } + + if (TREE_CODE (*anode) != FUNCTION_TYPE + && TREE_CODE (*anode) != METHOD_TYPE) + { + warning ("`%s' attribute only applies to function types", + IDENTIFIER_POINTER (name)); + continue; + } + } + + if (spec->handler != NULL) + returned_attrs = chainon ((*spec->handler) (anode, name, args, + flags, &no_add_attrs), + returned_attrs); + if (!no_add_attrs) + { + tree old_attrs; + tree a; + + if (DECL_P (*anode)) + old_attrs = DECL_ATTRIBUTES (*anode); + else + old_attrs = TYPE_ATTRIBUTES (*anode); + + for (a = lookup_attribute (spec->name, old_attrs); + a != NULL_TREE; + a = lookup_attribute (spec->name, TREE_CHAIN (a))) + { + if (simple_cst_equal (TREE_VALUE (a), args) == 1) + break; + } + + if (a == NULL_TREE) + { + /* This attribute isn't already in the list. */ + if (DECL_P (*anode)) + DECL_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs); + else if (flags & (int) ATTR_FLAG_TYPE_IN_PLACE) + TYPE_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs); + else + *anode = build_type_attribute_variant (*anode, + tree_cons (name, args, + old_attrs)); + } + } + } + + return returned_attrs; +} + +/* Handle a "packed" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_packed_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags; + bool *no_add_attrs; +{ + tree *type = NULL; + if (DECL_P (*node)) + { + if (TREE_CODE (*node) == TYPE_DECL) + type = &TREE_TYPE (*node); + } + else + type = node; + + if (type) + { + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *type = build_type_copy (*type); + TYPE_PACKED (*type) = 1; + } + else if (TREE_CODE (*node) == FIELD_DECL) + DECL_PACKED (*node) = 1; + /* We can't set DECL_PACKED for a VAR_DECL, because the bit is + used for DECL_REGISTER. It wouldn't mean anything anyway. */ + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "nocommon" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_nocommon_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + if (TREE_CODE (*node) == VAR_DECL) + DECL_COMMON (*node) = 0; + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "common" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_common_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + if (TREE_CODE (*node) == VAR_DECL) + DECL_COMMON (*node) = 1; + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "noreturn" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_noreturn_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree type = TREE_TYPE (*node); + + /* See FIXME comment in c_common_attribute_table. */ + if (TREE_CODE (*node) == FUNCTION_DECL) + TREE_THIS_VOLATILE (*node) = 1; + else if (TREE_CODE (type) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) + TREE_TYPE (*node) + = build_pointer_type + (build_type_variant (TREE_TYPE (type), + TREE_READONLY (TREE_TYPE (type)), 1)); + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "unused" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_unused_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags; + bool *no_add_attrs; +{ + if (DECL_P (*node)) + { + tree decl = *node; + + if (TREE_CODE (decl) == PARM_DECL + || TREE_CODE (decl) == VAR_DECL + || TREE_CODE (decl) == FUNCTION_DECL + || TREE_CODE (decl) == LABEL_DECL + || TREE_CODE (decl) == TYPE_DECL) + TREE_USED (decl) = 1; + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + } + else + { + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *node = build_type_copy (*node); + TREE_USED (*node) = 1; + } + + return NULL_TREE; +} + +/* Handle a "const" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_const_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree type = TREE_TYPE (*node); + + /* See FIXME comment on noreturn in c_common_attribute_table. */ + if (TREE_CODE (*node) == FUNCTION_DECL) + TREE_READONLY (*node) = 1; + else if (TREE_CODE (type) == POINTER_TYPE + && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) + TREE_TYPE (*node) + = build_pointer_type + (build_type_variant (TREE_TYPE (type), 1, + TREE_THIS_VOLATILE (TREE_TYPE (type)))); + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "transparent_union" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_transparent_union_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags; + bool *no_add_attrs; +{ + tree decl = NULL_TREE; + tree *type = NULL; + int is_type = 0; + + if (DECL_P (*node)) + { + decl = *node; + type = &TREE_TYPE (decl); + is_type = TREE_CODE (*node) == TYPE_DECL; + } + else if (TYPE_P (*node)) + type = node, is_type = 1; + + if (is_type + && TREE_CODE (*type) == UNION_TYPE + && (decl == 0 + || (TYPE_FIELDS (*type) != 0 + && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type))))) + { + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *type = build_type_copy (*type); + TYPE_TRANSPARENT_UNION (*type) = 1; + } + else if (decl != 0 && TREE_CODE (decl) == PARM_DECL + && TREE_CODE (*type) == UNION_TYPE + && TYPE_MODE (*type) == DECL_MODE (TYPE_FIELDS (*type))) + DECL_TRANSPARENT_UNION (decl) = 1; + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "constructor" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_constructor_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree decl = *node; + tree type = TREE_TYPE (decl); + + if (TREE_CODE (decl) == FUNCTION_DECL + && TREE_CODE (type) == FUNCTION_TYPE + && decl_function_context (decl) == 0) + { + DECL_STATIC_CONSTRUCTOR (decl) = 1; + TREE_USED (decl) = 1; + } + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "destructor" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_destructor_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree decl = *node; + tree type = TREE_TYPE (decl); + + if (TREE_CODE (decl) == FUNCTION_DECL + && TREE_CODE (type) == FUNCTION_TYPE + && decl_function_context (decl) == 0) + { + DECL_STATIC_DESTRUCTOR (decl) = 1; + TREE_USED (decl) = 1; + } + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "mode" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_mode_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree decl = *node; + tree type = TREE_TYPE (decl); + + *no_add_attrs = true; + + if (TREE_CODE (TREE_VALUE (args)) != IDENTIFIER_NODE) + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + else + { + int j; + const char *p = IDENTIFIER_POINTER (TREE_VALUE (args)); + int len = strlen (p); + enum machine_mode mode = VOIDmode; + tree typefm; + + if (len > 4 && p[0] == '_' && p[1] == '_' + && p[len - 1] == '_' && p[len - 2] == '_') + { + char *newp = (char *) alloca (len - 1); + + strcpy (newp, &p[2]); + newp[len - 4] = '\0'; + p = newp; + } + + /* Give this decl a type with the specified mode. + First check for the special modes. */ + if (! strcmp (p, "byte")) + mode = byte_mode; + else if (!strcmp (p, "word")) + mode = word_mode; + else if (! strcmp (p, "pointer")) + mode = ptr_mode; + else + for (j = 0; j < NUM_MACHINE_MODES; j++) + if (!strcmp (p, GET_MODE_NAME (j))) + mode = (enum machine_mode) j; + + if (mode == VOIDmode) + error ("unknown machine mode `%s'", p); + else if (0 == (typefm = type_for_mode (mode, + TREE_UNSIGNED (type)))) + error ("no data type for mode `%s'", p); + else + { + TREE_TYPE (decl) = type = typefm; + DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = 0; + if (TREE_CODE (decl) != FIELD_DECL) + layout_decl (decl, 0); + } + } + + return NULL_TREE; +} + +/* Handle a "section" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_section_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name ATTRIBUTE_UNUSED; + tree args; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree decl = *node; + + if (targetm.have_named_sections) + { + if ((TREE_CODE (decl) == FUNCTION_DECL + || TREE_CODE (decl) == VAR_DECL) + && TREE_CODE (TREE_VALUE (args)) == STRING_CST) + { + if (TREE_CODE (decl) == VAR_DECL + && current_function_decl != NULL_TREE + && ! TREE_STATIC (decl)) + { + error_with_decl (decl, + "section attribute cannot be specified for local variables"); + *no_add_attrs = true; + } + + /* The decl may have already been given a section attribute + from a previous declaration. Ensure they match. */ + else if (DECL_SECTION_NAME (decl) != NULL_TREE + && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl)), + TREE_STRING_POINTER (TREE_VALUE (args))) != 0) + { + error_with_decl (*node, + "section of `%s' conflicts with previous declaration"); + *no_add_attrs = true; + } + else + DECL_SECTION_NAME (decl) = TREE_VALUE (args); + } + else + { + error_with_decl (*node, + "section attribute not allowed for `%s'"); + *no_add_attrs = true; + } + } + else + { + error_with_decl (*node, + "section attributes are not supported for this target"); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "aligned" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_aligned_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name ATTRIBUTE_UNUSED; + tree args; + int flags; + bool *no_add_attrs; +{ + tree decl = NULL_TREE; + tree *type = NULL; + int is_type = 0; + tree align_expr = (args ? TREE_VALUE (args) + : size_int (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); + int i; + + if (DECL_P (*node)) + { + decl = *node; + type = &TREE_TYPE (decl); + is_type = TREE_CODE (*node) == TYPE_DECL; + } + else if (TYPE_P (*node)) + type = node, is_type = 1; + + /* Strip any NOPs of any kind. */ + while (TREE_CODE (align_expr) == NOP_EXPR + || TREE_CODE (align_expr) == CONVERT_EXPR + || TREE_CODE (align_expr) == NON_LVALUE_EXPR) + align_expr = TREE_OPERAND (align_expr, 0); + + if (TREE_CODE (align_expr) != INTEGER_CST) + { + error ("requested alignment is not a constant"); + *no_add_attrs = true; + } + else if ((i = tree_log2 (align_expr)) == -1) + { + error ("requested alignment is not a power of 2"); + *no_add_attrs = true; + } + else if (i > HOST_BITS_PER_INT - 2) + { + error ("requested alignment is too large"); + *no_add_attrs = true; + } + else if (is_type) + { + /* If we have a TYPE_DECL, then copy the type, so that we + don't accidentally modify a builtin type. See pushdecl. */ + if (decl && TREE_TYPE (decl) != error_mark_node + && DECL_ORIGINAL_TYPE (decl) == NULL_TREE) + { + tree tt = TREE_TYPE (decl); + *type = build_type_copy (*type); + DECL_ORIGINAL_TYPE (decl) = tt; + TYPE_NAME (*type) = decl; + TREE_USED (*type) = TREE_USED (decl); + TREE_TYPE (decl) = *type; + } + else if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *type = build_type_copy (*type); + + TYPE_ALIGN (*type) = (1 << i) * BITS_PER_UNIT; + TYPE_USER_ALIGN (*type) = 1; + } + else if (TREE_CODE (decl) != VAR_DECL + && TREE_CODE (decl) != FIELD_DECL) + { + error_with_decl (decl, + "alignment may not be specified for `%s'"); + *no_add_attrs = true; + } + else + { + DECL_ALIGN (decl) = (1 << i) * BITS_PER_UNIT; + DECL_USER_ALIGN (decl) = 1; + } + + return NULL_TREE; +} + +/* Handle a "weak" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_weak_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name ATTRIBUTE_UNUSED; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs ATTRIBUTE_UNUSED; +{ + declare_weak (*node); + + return NULL_TREE; +} + +/* Handle an "alias" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_alias_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree decl = *node; + + if ((TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) + || (TREE_CODE (decl) != FUNCTION_DECL && ! DECL_EXTERNAL (decl))) + { + error_with_decl (decl, + "`%s' defined both normally and as an alias"); + *no_add_attrs = true; + } + else if (decl_function_context (decl) == 0) + { + tree id; + + id = TREE_VALUE (args); + if (TREE_CODE (id) != STRING_CST) + { + error ("alias arg not a string"); + *no_add_attrs = true; + return NULL_TREE; + } + id = get_identifier (TREE_STRING_POINTER (id)); + /* This counts as a use of the object pointed to. */ + TREE_USED (id) = 1; + + if (TREE_CODE (decl) == FUNCTION_DECL) + DECL_INITIAL (decl) = error_mark_node; + else + DECL_EXTERNAL (decl) = 0; + assemble_alias (decl, id); + } + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "no_instrument_function" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_instrument_function_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree decl = *node; + + if (TREE_CODE (decl) != FUNCTION_DECL) + { + error_with_decl (decl, + "`%s' attribute applies only to functions", + IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + else if (DECL_INITIAL (decl)) + { + error_with_decl (decl, + "can't set `%s' attribute after definition", + IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + else + DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl) = 1; + + return NULL_TREE; +} + +/* Handle a "no_check_memory_usage" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_check_memory_usage_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree decl = *node; + + if (TREE_CODE (decl) != FUNCTION_DECL) + { + error_with_decl (decl, + "`%s' attribute applies only to functions", + IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + else if (DECL_INITIAL (decl)) + { + error_with_decl (decl, + "can't set `%s' attribute after definition", + IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + else + DECL_NO_CHECK_MEMORY_USAGE (decl) = 1; + + return NULL_TREE; +} + +/* Handle a "malloc" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_malloc_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + if (TREE_CODE (*node) == FUNCTION_DECL) + DECL_IS_MALLOC (*node) = 1; + /* ??? TODO: Support types. */ + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "no_limit_stack" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_no_limit_stack_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + tree decl = *node; + + if (TREE_CODE (decl) != FUNCTION_DECL) + { + error_with_decl (decl, + "`%s' attribute applies only to functions", + IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + else if (DECL_INITIAL (decl)) + { + error_with_decl (decl, + "can't set `%s' attribute after definition", + IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + else + DECL_NO_LIMIT_STACK (decl) = 1; + + return NULL_TREE; +} + +/* Handle a "pure" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_pure_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args ATTRIBUTE_UNUSED; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + if (TREE_CODE (*node) == FUNCTION_DECL) + DECL_IS_PURE (*node) = 1; + /* ??? TODO: Support types. */ + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two + lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE). + + The head of the declspec list is stored in DECLSPECS. + The head of the attribute list is stored in PREFIX_ATTRIBUTES. + + Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of + the list elements. We drop the containing TREE_LIST nodes and link the + resulting attributes together the way decl_attributes expects them. */ + +void +split_specs_attrs (specs_attrs, declspecs, prefix_attributes) + tree specs_attrs; + tree *declspecs, *prefix_attributes; +{ + tree t, s, a, next, specs, attrs; + + /* This can happen after an __extension__ in pedantic mode. */ + if (specs_attrs != NULL_TREE + && TREE_CODE (specs_attrs) == INTEGER_CST) + { + *declspecs = NULL_TREE; + *prefix_attributes = NULL_TREE; + return; + } + + /* This can happen in c++ (eg: decl: typespec initdecls ';'). */ + if (specs_attrs != NULL_TREE + && TREE_CODE (specs_attrs) != TREE_LIST) + { + *declspecs = specs_attrs; + *prefix_attributes = NULL_TREE; + return; + } + + /* Remember to keep the lists in the same order, element-wise. */ + + specs = s = NULL_TREE; + attrs = a = NULL_TREE; + for (t = specs_attrs; t; t = next) + { + next = TREE_CHAIN (t); + /* Declspecs have a non-NULL TREE_VALUE. */ + if (TREE_VALUE (t) != NULL_TREE) + { + if (specs == NULL_TREE) + specs = s = t; + else + { + TREE_CHAIN (s) = t; + s = t; + } + } + /* The TREE_PURPOSE may also be empty in the case of + __attribute__(()). */ + else if (TREE_PURPOSE (t) != NULL_TREE) + { + if (attrs == NULL_TREE) + attrs = a = TREE_PURPOSE (t); + else + { + TREE_CHAIN (a) = TREE_PURPOSE (t); + a = TREE_PURPOSE (t); + } + /* More attrs can be linked here, move A to the end. */ + while (TREE_CHAIN (a) != NULL_TREE) + a = TREE_CHAIN (a); + } + } + + /* Terminate the lists. */ + if (s != NULL_TREE) + TREE_CHAIN (s) = NULL_TREE; + if (a != NULL_TREE) + TREE_CHAIN (a) = NULL_TREE; + + /* All done. */ + *declspecs = specs; + *prefix_attributes = attrs; +} + +/* Strip attributes from SPECS_ATTRS, a list of declspecs and attributes. + This function is used by the parser when a rule will accept attributes + in a particular position, but we don't want to support that just yet. + + A warning is issued for every ignored attribute. */ + +tree +strip_attrs (specs_attrs) + tree specs_attrs; +{ + tree specs, attrs; + + split_specs_attrs (specs_attrs, &specs, &attrs); + + while (attrs) + { + warning ("`%s' attribute ignored", + IDENTIFIER_POINTER (TREE_PURPOSE (attrs))); + attrs = TREE_CHAIN (attrs); + } + + return specs; +} |