mirror of git://gcc.gnu.org/git/gcc.git
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* interface.h -- the interface type for Go.
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#ifndef LIBGO_INTERFACE_H
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#define LIBGO_INTERFACE_H
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struct __go_type_descriptor;
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/* A variable of interface type is an instance of this struct, if the
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interface has any methods. */
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struct __go_interface
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{
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/* A pointer to the interface method table. The first pointer is
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the type descriptor of the object. Subsequent pointers are
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pointers to functions. This is effectively the vtable for this
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interface. The function pointers are in the same order as the
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list in the internal representation of the interface, which sorts
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them by name. */
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const void **__methods;
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/* The object. If the object is a pointer--if the type descriptor
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code is GO_PTR or GO_UNSAFE_POINTER--then this field is the value
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of the object itself. Otherwise this is a pointer to memory
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which holds the value. */
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void *__object;
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};
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/* A variable of an empty interface type is an instance of this
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struct. */
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struct __go_empty_interface
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{
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/* The type descriptor of the object. */
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const struct __go_type_descriptor *__type_descriptor;
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/* The object. This is the same as __go_interface above. */
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void *__object;
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};
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extern void *
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__go_convert_interface (const struct __go_type_descriptor *,
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const struct __go_type_descriptor *);
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extern void *
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__go_convert_interface_2 (const struct __go_type_descriptor *,
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const struct __go_type_descriptor *,
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_Bool may_fail);
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extern _Bool
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__go_can_convert_to_interface(const struct __go_type_descriptor *,
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const struct __go_type_descriptor *);
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#endif /* !defined(LIBGO_INTERFACE_H) */
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