Initial C++ runtime work. Much more to do.
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runtime/typeinfo.h
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313
runtime/typeinfo.h
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/*
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* Copyright 2010-2011 PathScale, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stddef.h>
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#include "abi_namespace.h"
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namespace ABI_NAMESPACE
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{
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struct __class_type_info;
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}
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namespace std
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{
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/**
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* Standard type info class. The layout of this class is specified by the
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* ABI. The layout of the vtable is not, but is intended to be
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* compatible with the GNU ABI.
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*
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* Unlike the GNU version, the vtable layout is considered semi-private.
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*/
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class type_info
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{
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public:
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/**
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* Virtual destructor. This class must have one virtual function to
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* ensure that it has a vtable.
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*/
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virtual ~type_info();
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bool operator==(const type_info &) const;
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bool operator!=(const type_info &) const;
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bool before(const type_info &) const;
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const char* name() const;
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type_info();
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private:
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type_info(const type_info& rhs);
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type_info& operator= (const type_info& rhs);
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const char *__type_name;
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/*
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* The following functions are in this order to match the
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* vtable layout of libsupc++. This allows libcxxrt to be used
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* with libraries that depend on this.
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*
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* These functions are in the public headers for libstdc++, so
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* we have to assume that someone will probably call them and
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* expect them to work. Their names must also match the names used in
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* libsupc++, so that code linking against this library can subclass
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* type_info and correctly fill in the values in the vtables.
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*/
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public:
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/**
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* Returns true if this is some pointer type, false otherwise.
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*/
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virtual bool __is_pointer_p() const { return false; }
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/**
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* Returns true if this is some function type, false otherwise.
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*/
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virtual bool __is_function_p() const { return false; }
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/**
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* Catch function. Allows external libraries to implement
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* their own basic types. This is used, for example, in the
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* GNUstep Objective-C runtime to allow Objective-C types to be
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* caught in G++ catch blocks.
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*
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* The outer parameter indicates the number of outer pointers
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* in the high bits. The low bit indicates whether the
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* pointers are const qualified.
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*/
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virtual bool __do_catch(const type_info *thrown_type,
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void **thrown_object,
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unsigned outer) const;
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/**
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* Performs an upcast. This is used in exception handling to
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* cast from subclasses to superclasses. If the upcast is
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* possible, it returns true and adjusts the pointer. If the
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* upcast is not possible, it returns false and does not adjust
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* the pointer.
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*/
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virtual bool __do_upcast(
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const ABI_NAMESPACE::__class_type_info *target,
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void **thrown_object) const
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{
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return false;
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}
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};
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}
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namespace ABI_NAMESPACE
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{
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/**
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* Primitive type info, for intrinsic types.
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*/
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struct __fundamental_type_info : public std::type_info
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{
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virtual ~__fundamental_type_info();
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};
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/**
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* Type info for arrays.
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*/
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struct __array_type_info : public std::type_info
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{
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virtual ~__array_type_info();
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};
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/**
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* Type info for functions.
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*/
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struct __function_type_info : public std::type_info
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{
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virtual ~__function_type_info();
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virtual bool __is_function_p() const { return true; }
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};
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/**
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* Type info for enums.
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*/
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struct __enum_type_info : public std::type_info
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{
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virtual ~__enum_type_info();
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};
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/**
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* Base class for class type info. Used only for tentative definitions.
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*/
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struct __class_type_info : public std::type_info
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{
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virtual ~__class_type_info();
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/**
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* Function implementing dynamic casts.
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*/
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virtual void *cast_to(void *obj, const struct __class_type_info *other) const;
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virtual bool __do_upcast(const __class_type_info *target,
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void **thrown_object) const
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{
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return this == target;
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}
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};
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/**
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* Single-inheritance class type info. This is used for classes containing
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* a single non-virtual base class at offset 0.
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*/
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struct __si_class_type_info : public __class_type_info
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{
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virtual ~__si_class_type_info();
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const __class_type_info *__base_type;
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virtual bool __do_upcast(
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const ABI_NAMESPACE::__class_type_info *target,
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void **thrown_object) const;
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virtual void *cast_to(void *obj, const struct __class_type_info *other) const;
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};
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/**
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* Type info for base classes. Classes with multiple bases store an array
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* of these, one for each superclass.
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*/
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struct __base_class_type_info
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{
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const __class_type_info *__base_type;
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private:
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/**
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* The high __offset_shift bits of this store the (signed) offset
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* of the base class. The low bits store flags from
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* __offset_flags_masks.
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*/
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long __offset_flags;
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/**
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* Flags used in the low bits of __offset_flags.
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*/
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enum __offset_flags_masks
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{
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/** This base class is virtual. */
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__virtual_mask = 0x1,
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/** This base class is public. */
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__public_mask = 0x2,
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/** The number of bits reserved for flags. */
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__offset_shift = 8
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};
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public:
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/**
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* Returns the offset of the base class.
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*/
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long offset() const
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{
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return __offset_flags >> __offset_shift;
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}
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/**
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* Returns the flags.
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*/
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long flags() const
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{
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return __offset_flags & ((1 << __offset_shift) - 1);
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}
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/**
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* Returns whether this is a public base class.
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*/
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bool isPublic() const { return flags() & __public_mask; }
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/**
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* Returns whether this is a virtual base class.
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*/
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bool isVirtual() const { return flags() & __virtual_mask; }
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};
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/**
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* Type info for classes with virtual bases or multiple superclasses.
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*/
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struct __vmi_class_type_info : public __class_type_info
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{
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virtual ~__vmi_class_type_info();
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/** Flags describing this class. Contains values from __flags_masks. */
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unsigned int __flags;
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/** The number of base classes. */
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unsigned int __base_count;
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/**
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* Array of base classes - this actually has __base_count elements, not
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* 1.
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*/
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__base_class_type_info __base_info[1];
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/**
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* Flags used in the __flags field.
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*/
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enum __flags_masks
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{
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/** The class has non-diamond repeated inheritance. */
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__non_diamond_repeat_mask = 0x1,
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/** The class is diamond shaped. */
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__diamond_shaped_mask = 0x2
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};
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virtual bool __do_upcast(
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const ABI_NAMESPACE::__class_type_info *target,
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void **thrown_object) const;
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virtual void *cast_to(void *obj, const struct __class_type_info *other) const;
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};
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/**
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* Base class used for both pointer and pointer-to-member type info.
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*/
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struct __pbase_type_info : public std::type_info
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{
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virtual ~__pbase_type_info();
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/**
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* Flags. Values from __masks.
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*/
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unsigned int __flags;
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/**
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* The type info for the pointee.
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*/
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const std::type_info *__pointee;
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/**
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* Masks used for qualifiers on the pointer.
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*/
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enum __masks
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{
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/** Pointer has const qualifier. */
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__const_mask = 0x1,
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/** Pointer has volatile qualifier. */
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__volatile_mask = 0x2,
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/** Pointer has restrict qualifier. */
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__restrict_mask = 0x4,
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/** Pointer points to an incomplete type. */
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__incomplete_mask = 0x8,
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/** Pointer is a pointer to a member of an incomplete class. */
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__incomplete_class_mask = 0x10
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};
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virtual bool __do_catch(const type_info *thrown_type,
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void **thrown_object,
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unsigned outer) const;
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};
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/**
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* Pointer type info.
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*/
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struct __pointer_type_info : public __pbase_type_info
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{
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virtual ~__pointer_type_info();
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virtual bool __is_pointer_p() const { return true; }
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};
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/**
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* Pointer to member type info.
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*/
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struct __pointer_to_member_type_info : public __pbase_type_info
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{
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virtual ~__pointer_to_member_type_info();
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/**
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* Pointer to the class containing this member.
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*/
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const __class_type_info *__context;
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};
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}
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