diff options
Diffstat (limited to 'src/typeinfo.h')
| -rw-r--r-- | src/typeinfo.h | 107 |
1 files changed, 97 insertions, 10 deletions
diff --git a/src/typeinfo.h b/src/typeinfo.h index e35f6c1..8223977 100644 --- a/src/typeinfo.h +++ b/src/typeinfo.h @@ -26,7 +26,86 @@ #include <stddef.h> #include "abi_namespace.h" -#include "typeinfo" + +namespace ABI_NAMESPACE +{ + struct __class_type_info; +} +namespace std +{ + /** + * Standard type info class. The layout of this class is specified by the + * ABI. The layout of the vtable is not, but is intended to be + * compatible with the GNU ABI. + * + * Unlike the GNU version, the vtable layout is considered semi-private. + */ + class type_info + { + public: + /** + * Virtual destructor. This class must have one virtual function to + * ensure that it has a vtable. + */ + virtual ~type_info(); + bool operator==(const type_info &) const; + bool operator!=(const type_info &) const; + bool before(const type_info &) const; + const char* name() const; + type_info(); + private: + type_info(const type_info& rhs); + type_info& operator= (const type_info& rhs); + const char *__type_name; + /* + * The following functions are in this order to match the + * vtable layout of libsupc++. This allows libcxxrt to be used + * with libraries that depend on this. + * + * These functions are in the public headers for libstdc++, so + * we have to assume that someone will probably call them and + * expect them to work. Their names must also match the names used in + * libsupc++, so that code linking against this library can subclass + * type_info and correctly fill in the values in the vtables. + */ + public: + /** + * Catch function. Allows external libraries to implement + * their own basic types. This is used, for example, in the + * GNUstep Objective-C runtime to allow Objective-C types to be + * caught in G++ catch blocks. + * + * The outer parameter indicates the number of outer pointers + * in the high bits. The low bit indicates whether the + * pointers are const qualified. + */ + virtual bool __do_catch(const type_info *thrown_type, + void **thrown_object, + unsigned outer) const; + /** + * Performs an upcast. This is used in exception handling to + * cast from subclasses to superclasses. If the upcast is + * possible, it returns true and adjusts the pointer. If the + * upcast is not possible, it returns false and does not adjust + * the pointer. + */ + virtual bool __do_upcast( + const ABI_NAMESPACE::__class_type_info *target, + void **thrown_object) const + { + return false; + } + /** + * Returns true if this is some pointer type, false otherwise. + */ + virtual bool __is_pointer_p() const { return false; } + /** + * Returns true if this is some function type, false otherwise. + */ + virtual bool __is_function_p() const { return false; } + }; +} + namespace ABI_NAMESPACE { @@ -50,6 +129,7 @@ namespace ABI_NAMESPACE struct __function_type_info : public std::type_info { virtual ~__function_type_info(); + virtual bool __is_function_p() const { return true; } }; /** * Type info for enums. @@ -68,13 +148,12 @@ namespace ABI_NAMESPACE /** * Function implementing dynamic casts. */ - virtual void *cast_to(void *obj, - const struct __class_type_info *other) const; - /** - * Function returning whether a cast from this type to another type is - * possible. - */ - virtual bool can_cast_to(const struct __class_type_info *other) const; + virtual void *cast_to(void *obj, const struct __class_type_info *other) const; + virtual bool __do_upcast(const __class_type_info *target, + void **thrown_object) const + { + return this == target; + } }; /** @@ -85,8 +164,10 @@ namespace ABI_NAMESPACE { virtual ~__si_class_type_info(); const __class_type_info *__base_type; + virtual bool __do_upcast( + const ABI_NAMESPACE::__class_type_info *target, + void **thrown_object) const; virtual void *cast_to(void *obj, const struct __class_type_info *other) const; - virtual bool can_cast_to(const struct __class_type_info *other) const; }; /** @@ -166,8 +247,10 @@ namespace ABI_NAMESPACE /** The class is diamond shaped. */ __diamond_shaped_mask = 0x2 }; + virtual bool __do_upcast( + const ABI_NAMESPACE::__class_type_info *target, + void **thrown_object) const; virtual void *cast_to(void *obj, const struct __class_type_info *other) const; - virtual bool can_cast_to(const struct __class_type_info *other) const; }; /** @@ -201,6 +284,10 @@ namespace ABI_NAMESPACE /** Pointer is a pointer to a member of an incomplete class. */ __incomplete_class_mask = 0x10 }; + virtual bool __is_pointer_p() const { return true; } + virtual bool __do_catch(const type_info *thrown_type, + void **thrown_object, + unsigned outer) const; }; /** |