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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [runtime/] [go-assert-interface.c] - Rev 757
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/* go-assert-interface.c -- interface type assertion for Go. Copyright 2010 The Go Authors. All rights reserved. Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. */ #include "go-alloc.h" #include "go-assert.h" #include "go-panic.h" #include "interface.h" /* This is called by the compiler to implement a type assertion from one interface type to another. This returns the value that should go in the first field of the result tuple. The result may be an empty or a non-empty interface. */ const void * __go_assert_interface (const struct __go_type_descriptor *lhs_descriptor, const struct __go_type_descriptor *rhs_descriptor) { const struct __go_interface_type *lhs_interface; if (rhs_descriptor == NULL) { struct __go_empty_interface panic_arg; /* A type assertion is not permitted with a nil interface. */ newTypeAssertionError (NULL, NULL, lhs_descriptor, NULL, NULL, lhs_descriptor->__reflection, NULL, &panic_arg); __go_panic (panic_arg); } /* A type assertion to an empty interface just returns the object descriptor. */ __go_assert (lhs_descriptor->__code == GO_INTERFACE); lhs_interface = (const struct __go_interface_type *) lhs_descriptor; if (lhs_interface->__methods.__count == 0) return rhs_descriptor; return __go_convert_interface_2 (lhs_descriptor, rhs_descriptor, 0); }
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