diff options
Diffstat (limited to 'gcc/c-common.c')
| -rw-r--r-- | gcc/c-common.c | 1168 |
1 files changed, 1151 insertions, 17 deletions
diff --git a/gcc/c-common.c b/gcc/c-common.c index c1201cd..03966a8 100644 --- a/gcc/c-common.c +++ b/gcc/c-common.c @@ -271,6 +271,133 @@ static int if_stack_space = 0; /* Stack pointer. */ static int if_stack_pointer = 0; +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_noinline_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_always_inline_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_used_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_visibility_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_no_instrument_function_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 *)); +static tree handle_deprecated_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree handle_vector_size_attribute PARAMS ((tree *, tree, tree, int, + bool *)); +static tree vector_size_helper PARAMS ((tree, tree)); + +/* Table of machine-independent attributes common to all C-like languages. */ +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 }, + { "noinline", 0, 0, true, false, false, + handle_noinline_attribute }, + { "always_inline", 0, 0, true, false, false, + handle_always_inline_attribute }, + { "used", 0, 0, true, false, false, + handle_used_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, false, true, 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 }, + { "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 }, + { "deprecated", 0, 0, false, false, false, + handle_deprecated_attribute }, + { "vector_size", 1, 1, false, true, false, + handle_vector_size_attribute }, + { "visibility", 1, 1, true, false, false, + handle_visibility_attribute }, + { NULL, 0, 0, false, false, false, NULL } +}; + +/* Give the specifications for the format attributes, used by C and all + descendents. */ + +const struct attribute_spec c_common_format_attribute_table[] = +{ + /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ + { "format", 3, 3, false, true, true, + handle_format_attribute }, + { "format_arg", 1, 1, false, true, true, + handle_format_arg_attribute }, + { NULL, 0, 0, false, false, false, NULL } +}; + /* Record the start of an if-then, and record the start of it for ambiguous else detection. @@ -2495,19 +2622,6 @@ c_alignof_expr (expr) return fold (build1 (NOP_EXPR, c_size_type_node, t)); } -/* Give the specifications for the format attributes, used by C and all - descendents. */ - -static const struct attribute_spec c_format_attribute_table[] = -{ - /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ - { "format", 3, 3, false, true, true, - handle_format_attribute }, - { "format_arg", 1, 1, false, true, true, - handle_format_arg_attribute }, - { NULL, 0, 0, false, false, false, NULL } -}; - /* Build tree nodes and builtin functions common to both C and C++ language frontends. */ @@ -2548,10 +2662,6 @@ c_common_nodes_and_builtins () tree va_list_ref_type_node; tree va_list_arg_type_node; - /* We must initialize this before any builtin functions (which might have - attributes) are declared. (c_common_init is too late.) */ - format_attribute_table = c_format_attribute_table; - /* Define `int' and `char' first so that dbx will output them first. */ record_builtin_type (RID_INT, NULL, integer_type_node); record_builtin_type (RID_CHAR, "char", char_type_node); @@ -4275,3 +4385,1027 @@ shadow_warning (msgid, name, decl) "shadowed declaration is here"); } +/* Attribute handlers common to C front ends. */ + +/* 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 "noinline" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_noinline_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_UNINLINABLE (*node) = 1; + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "always_inline" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_always_inline_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) + { + /* Do nothing else, just set the attribute. We'll get at + it later with lookup_attribute. */ + } + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle a "used" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_used_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) + TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (*node)) + = TREE_USED (*node) = 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 type = *node; + + *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; + } + + /* Change this type to have 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 = (*lang_hooks.types.type_for_mode) + (mode, TREE_UNSIGNED (type)))) + error ("no data type for mode `%s'", p); + else + *node = typefm; + /* No need to layout the type here. The caller should do this. */ + } + + 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; + } + else + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + +/* Handle an "visibility" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_visibility_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 (decl_function_context (decl) != 0 || ! TREE_PUBLIC (decl)) + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + *no_add_attrs = true; + } + else + { + tree id; + + id = TREE_VALUE (args); + if (TREE_CODE (id) != STRING_CST) + { + error ("visibility arg not a string"); + *no_add_attrs = true; + return NULL_TREE; + } + if (strcmp (TREE_STRING_POINTER (id), "hidden") + && strcmp (TREE_STRING_POINTER (id), "protected") + && strcmp (TREE_STRING_POINTER (id), "internal")) + { + error ("visibility arg must be one of \"hidden\", \"protected\" or \"internal\""); + *no_add_attrs = true; + return NULL_TREE; + } + } + + 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 "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; +} + +/* Handle a "deprecated" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_deprecated_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_TREE; + int warn = 0; + const char *what = NULL; + + if (DECL_P (*node)) + { + tree decl = *node; + type = TREE_TYPE (decl); + + if (TREE_CODE (decl) == TYPE_DECL + || TREE_CODE (decl) == PARM_DECL + || TREE_CODE (decl) == VAR_DECL + || TREE_CODE (decl) == FUNCTION_DECL + || TREE_CODE (decl) == FIELD_DECL) + TREE_DEPRECATED (decl) = 1; + else + warn = 1; + } + else if (TYPE_P (*node)) + { + if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE)) + *node = build_type_copy (*node); + TREE_DEPRECATED (*node) = 1; + type = *node; + } + else + warn = 1; + + if (warn) + { + *no_add_attrs = true; + if (type && TYPE_NAME (type)) + { + if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) + what = IDENTIFIER_POINTER (TYPE_NAME (*node)); + else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL + && DECL_NAME (TYPE_NAME (type))) + what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); + } + if (what) + warning ("`%s' attribute ignored for `%s'", + IDENTIFIER_POINTER (name), what); + else + warning ("`%s' attribute ignored", + IDENTIFIER_POINTER (name)); + } + + return NULL_TREE; +} + +/* Keep a list of vector type nodes we created in handle_vector_size_attribute, + to prevent us from duplicating type nodes unnecessarily. + The normal mechanism to prevent duplicates is to use type_hash_canon, but + since we want to distinguish types that are essentially identical (except + for their debug representation), we use a local list here. */ +static tree vector_type_node_list = 0; + +/* Handle a "vector_size" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_vector_size_attribute (node, name, args, flags, no_add_attrs) + tree *node; + tree name; + tree args; + int flags ATTRIBUTE_UNUSED; + bool *no_add_attrs; +{ + unsigned HOST_WIDE_INT vecsize, nunits; + enum machine_mode mode, orig_mode, new_mode; + tree type = *node, new_type = NULL_TREE; + tree type_list_node; + + *no_add_attrs = true; + + if (! host_integerp (TREE_VALUE (args), 1)) + { + warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name)); + return NULL_TREE; + } + + /* Get the vector size (in bytes). */ + vecsize = tree_low_cst (TREE_VALUE (args), 1); + + /* We need to provide for vector pointers, vector arrays, and + functions returning vectors. For example: + + __attribute__((vector_size(16))) short *foo; + + In this case, the mode is SI, but the type being modified is + HI, so we need to look further. */ + + while (POINTER_TYPE_P (type) + || TREE_CODE (type) == FUNCTION_TYPE + || TREE_CODE (type) == ARRAY_TYPE) + type = TREE_TYPE (type); + + /* Get the mode of the type being modified. */ + orig_mode = TYPE_MODE (type); + + if (TREE_CODE (type) == RECORD_TYPE + || (GET_MODE_CLASS (orig_mode) != MODE_FLOAT + && GET_MODE_CLASS (orig_mode) != MODE_INT) + || ! host_integerp (TYPE_SIZE_UNIT (type), 1)) + { + error ("invalid vector type for attribute `%s'", + IDENTIFIER_POINTER (name)); + return NULL_TREE; + } + + /* Calculate how many units fit in the vector. */ + nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); + + /* Find a suitably sized vector. */ + new_mode = VOIDmode; + for (mode = GET_CLASS_NARROWEST_MODE (GET_MODE_CLASS (orig_mode) == MODE_INT + ? MODE_VECTOR_INT + : MODE_VECTOR_FLOAT); + mode != VOIDmode; + mode = GET_MODE_WIDER_MODE (mode)) + if (vecsize == GET_MODE_SIZE (mode) + && nunits == (unsigned HOST_WIDE_INT) GET_MODE_NUNITS (mode)) + { + new_mode = mode; + break; + } + + if (new_mode == VOIDmode) + { + error ("no vector mode with the size and type specified could be found"); + return NULL_TREE; + } + + for (type_list_node = vector_type_node_list; type_list_node; + type_list_node = TREE_CHAIN (type_list_node)) + { + tree other_type = TREE_VALUE (type_list_node); + tree record = TYPE_DEBUG_REPRESENTATION_TYPE (other_type); + tree fields = TYPE_FIELDS (record); + tree field_type = TREE_TYPE (fields); + tree array_type = TREE_TYPE (field_type); + if (TREE_CODE (fields) != FIELD_DECL + || TREE_CODE (field_type) != ARRAY_TYPE) + abort (); + + if (TYPE_MODE (other_type) == mode && type == array_type) + { + new_type = other_type; + break; + } + } + + if (new_type == NULL_TREE) + { + tree index, array, rt, list_node; + + new_type = (*lang_hooks.types.type_for_mode) (new_mode, + TREE_UNSIGNED (type)); + + if (!new_type) + { + error ("no vector mode with the size and type specified could be found"); + return NULL_TREE; + } + + new_type = build_type_copy (new_type); + + /* Set the debug information here, because this is the only + place where we know the underlying type for a vector made + with vector_size. For debugging purposes we pretend a vector + is an array within a structure. */ + index = build_int_2 (TYPE_VECTOR_SUBPARTS (new_type) - 1, 0); + array = build_array_type (type, build_index_type (index)); + rt = make_node (RECORD_TYPE); + + TYPE_FIELDS (rt) = build_decl (FIELD_DECL, get_identifier ("f"), array); + DECL_CONTEXT (TYPE_FIELDS (rt)) = rt; + layout_type (rt); + TYPE_DEBUG_REPRESENTATION_TYPE (new_type) = rt; + + list_node = build_tree_list (NULL, new_type); + TREE_CHAIN (list_node) = vector_type_node_list; + vector_type_node_list = list_node; + } + + /* Build back pointers if needed. */ + *node = vector_size_helper (*node, new_type); + + return NULL_TREE; +} + +/* HACK. GROSS. This is absolutely disgusting. I wish there was a + better way. + + If we requested a pointer to a vector, build up the pointers that + we stripped off while looking for the inner type. Similarly for + return values from functions. + + The argument "type" is the top of the chain, and "bottom" is the + new type which we will point to. */ + +static tree +vector_size_helper (type, bottom) + tree type, bottom; +{ + tree inner, outer; + + if (POINTER_TYPE_P (type)) + { + inner = vector_size_helper (TREE_TYPE (type), bottom); + outer = build_pointer_type (inner); + } + else if (TREE_CODE (type) == ARRAY_TYPE) + { + inner = vector_size_helper (TREE_TYPE (type), bottom); + outer = build_array_type (inner, TYPE_VALUES (type)); + } + else if (TREE_CODE (type) == FUNCTION_TYPE) + { + inner = vector_size_helper (TREE_TYPE (type), bottom); + outer = build_function_type (inner, TYPE_VALUES (type)); + } + else + return bottom; + + TREE_READONLY (outer) = TREE_READONLY (type); + TREE_THIS_VOLATILE (outer) = TREE_THIS_VOLATILE (type); + + return outer; +} |