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sdiff udiff text old ( 232950 ) new ( 233235 )
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dynamic_cast.cc (232950) dynamic_cast.cc (233235)
1/*
2 * Copyright 2010-2011 PathScale, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.

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41};
42
43/**
44 * Simple macro that does pointer arithmetic in bytes but returns a value of
45 * the same type as the original.
46 */
47#define ADD_TO_PTR(x, off) (__typeof__(x))(((char*)x) + off)
48
1/*
2 * Copyright 2010-2011 PathScale, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.

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41};
42
43/**
44 * Simple macro that does pointer arithmetic in bytes but returns a value of
45 * the same type as the original.
46 */
47#define ADD_TO_PTR(x, off) (__typeof__(x))(((char*)x) + off)
48
49bool __class_type_info::can_cast_to(const struct __class_type_info *other) const
49bool std::type_info::__do_catch(std::type_info const *ex_type,
50 void **exception_object,
51 unsigned int outer) const
50{
52{
51 return this == other;
53 const type_info *type = this;
54
55 if (type == ex_type)
56 {
57 return true;
58 }
59 if (const __class_type_info *cti = dynamic_cast<const __class_type_info *>(type))
60 {
61 return ex_type->__do_upcast(cti, exception_object);
62 }
63 return false;
52}
53
64}
65
66bool __pbase_type_info::__do_catch(std::type_info const *ex_type,
67 void **exception_object,
68 unsigned int outer) const
69{
70 if (ex_type == this)
71 {
72 return true;
73 }
74 if (!ex_type->__is_pointer_p())
75 {
76 // Can't catch a non-pointer type in a pointer catch
77 return false;
78 }
79
80 if (!(outer & 1))
81 {
82 // If the low bit is cleared on this means that we've gone
83 // through a pointer that is not const qualified.
84 return false;
85 }
86 // Clear the low bit on outer if we're not const qualified.
87 if (!(__flags & __const_mask))
88 {
89 outer &= ~1;
90 }
91
92 const __pbase_type_info *ptr_type =
93 static_cast<const __pbase_type_info*>(ex_type);
94
95 if (ptr_type->__flags & ~__flags)
96 {
97 // Handler pointer is less qualified
98 return false;
99 }
100
101 // Special case for void* handler.
102 if(*__pointee == typeid(void))
103 {
104 return true;
105 }
106
107 return __pointee->__do_catch(ptr_type->__pointee, exception_object, outer);
108}
109
54void *__class_type_info::cast_to(void *obj, const struct __class_type_info *other) const
55{
56 if (this == other)
57 {
58 return obj;
59 }
60 return 0;
61}
62
110void *__class_type_info::cast_to(void *obj, const struct __class_type_info *other) const
111{
112 if (this == other)
113 {
114 return obj;
115 }
116 return 0;
117}
118
63
64bool __si_class_type_info::can_cast_to(const struct __class_type_info *other) const
65{
66 return this == other || __base_type->can_cast_to(other);
67}
68
69void *__si_class_type_info::cast_to(void *obj, const struct __class_type_info *other) const
70{
71 if (this == other)
72 {
73 return obj;
74 }
75 return __base_type->cast_to(obj, other);
76}
119void *__si_class_type_info::cast_to(void *obj, const struct __class_type_info *other) const
120{
121 if (this == other)
122 {
123 return obj;
124 }
125 return __base_type->cast_to(obj, other);
126}
77
78
79bool __vmi_class_type_info::can_cast_to(const struct __class_type_info *other) const
127bool __si_class_type_info::__do_upcast(const __class_type_info *target,
128 void **thrown_object) const
80{
129{
81 if (this == other)
130 if (this == target)
82 {
83 return true;
84 }
131 {
132 return true;
133 }
85 for (unsigned int i=0 ; i<__base_count ; i++)
86 {
87 const __base_class_type_info *info = &__base_info[i];
88 if(info->isPublic() && info->__base_type->can_cast_to(other))
89 {
90 return true;
91 }
92 }
93 return false;
134 return __base_type->__do_upcast(target, thrown_object);
94}
95
96void *__vmi_class_type_info::cast_to(void *obj, const struct __class_type_info *other) const
97{
135}
136
137void *__vmi_class_type_info::cast_to(void *obj, const struct __class_type_info *other) const
138{
98 if (this == other)
139 if (__do_upcast(other, &obj))
99 {
100 return obj;
101 }
140 {
141 return obj;
142 }
143 return 0;
144}
145
146bool __vmi_class_type_info::__do_upcast(const __class_type_info *target,
147 void **thrown_object) const
148{
149 if (this == target)
150 {
151 return true;
152 }
102 for (unsigned int i=0 ; i<__base_count ; i++)
103 {
104 const __base_class_type_info *info = &__base_info[i];
105 ptrdiff_t offset = info->offset();
106 // If this is a virtual superclass, the offset is stored in the
107 // object's vtable at the offset requested; 2.9.5.6.c:
108 //
109 // 'For a non-virtual base, this is the offset in the object of the
110 // base subobject. For a virtual base, this is the offset in the
111 // virtual table of the virtual base offset for the virtual base
112 // referenced (negative).'
113
153 for (unsigned int i=0 ; i<__base_count ; i++)
154 {
155 const __base_class_type_info *info = &__base_info[i];
156 ptrdiff_t offset = info->offset();
157 // If this is a virtual superclass, the offset is stored in the
158 // object's vtable at the offset requested; 2.9.5.6.c:
159 //
160 // 'For a non-virtual base, this is the offset in the object of the
161 // base subobject. For a virtual base, this is the offset in the
162 // virtual table of the virtual base offset for the virtual base
163 // referenced (negative).'
164
165 void *obj = *thrown_object;
114 if (info->isVirtual())
115 {
116 // Object's vtable
117 ptrdiff_t *off = *(ptrdiff_t**)obj;
118 // Offset location in vtable
119 off = ADD_TO_PTR(off, offset);
120 offset = *off;
121 }
122 void *cast = ADD_TO_PTR(obj, offset);
123
166 if (info->isVirtual())
167 {
168 // Object's vtable
169 ptrdiff_t *off = *(ptrdiff_t**)obj;
170 // Offset location in vtable
171 off = ADD_TO_PTR(off, offset);
172 offset = *off;
173 }
174 void *cast = ADD_TO_PTR(obj, offset);
175
124 if (info->__base_type == other)
176 if (info->__base_type == target ||
177 (info->__base_type->__do_upcast(target, &cast)))
125 {
178 {
126 return cast;
179 *thrown_object = cast;
180 return true;
127 }
181 }
128 if ((cast = info->__base_type->cast_to(cast, other)))
129 {
130 return cast;
131 }
132 }
133 return 0;
134}
135
182 }
183 return 0;
184}
185
186
136/**
137 * ABI function used to implement the dynamic_cast<> operator. Some cases of
138 * this operator are implemented entirely in the compiler (e.g. to void*).
139 * This function implements the dynamic casts of the form dynamic_cast<T>(v).
140 * This will be translated to a call to this function with the value v as the
141 * first argument. The type id of the static type of v is the second argument
142 * and the type id of the destination type (T) is the third argument.
143 *

--- 16 unchanged lines hidden --- 		187/**
188 * ABI function used to implement the dynamic_cast<> operator. Some cases of
189 * this operator are implemented entirely in the compiler (e.g. to void*).
190 * This function implements the dynamic casts of the form dynamic_cast<T>(v).
191 * This will be translated to a call to this function with the value v as the
192 * first argument. The type id of the static type of v is the second argument
193 * and the type id of the destination type (T) is the third argument.
194 *

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