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jeremybenn |
// Copyright 2010 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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package runtime
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#include "runtime.h"
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#include "go-type.h"
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#include "interface.h"
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typedef struct __go_type_descriptor descriptor;
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typedef const struct __go_type_descriptor const_descriptor;
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typedef struct __go_interface interface;
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typedef struct __go_empty_interface empty_interface;
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// Compare two type descriptors.
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func ifacetypeeq(a *descriptor, b *descriptor) (eq bool) {
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eq = __go_type_descriptors_equal(a, b);
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}
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// Return the descriptor for an empty interface type.n
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func efacetype(e empty_interface) (d *const_descriptor) {
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return e.__type_descriptor;
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}
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// Return the descriptor for a non-empty interface type.
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func ifacetype(i interface) (d *const_descriptor) {
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if (i.__methods == nil) {
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return nil;
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}
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d = i.__methods[0];
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}
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// Convert an empty interface to an empty interface.
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func ifaceE2E2(e empty_interface) (ret empty_interface, ok bool) {
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if(((uintptr_t)e.__type_descriptor&reflectFlags) != 0)
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runtime_panicstring("invalid interface value");
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ret = e;
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ok = ret.__type_descriptor != nil;
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}
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// Convert a non-empty interface to an empty interface.
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func ifaceI2E2(i interface) (ret empty_interface, ok bool) {
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if (i.__methods == nil) {
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ret.__type_descriptor = nil;
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ret.__object = nil;
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ok = 0;
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} else {
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ret.__type_descriptor = i.__methods[0];
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ret.__object = i.__object;
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ok = 1;
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}
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}
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// Convert an empty interface to a non-empty interface.
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func ifaceE2I2(inter *descriptor, e empty_interface) (ret interface, ok bool) {
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if(((uintptr_t)e.__type_descriptor&reflectFlags) != 0)
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runtime_panicstring("invalid interface value");
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if (e.__type_descriptor == nil) {
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ret.__methods = nil;
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ret.__object = nil;
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ok = 0;
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} else {
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ret.__methods = __go_convert_interface_2(inter,
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e.__type_descriptor,
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1);
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ret.__object = e.__object;
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ok = ret.__methods != nil;
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}
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}
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// Convert a non-empty interface to a non-empty interface.
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func ifaceI2I2(inter *descriptor, i interface) (ret interface, ok bool) {
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if (i.__methods == nil) {
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ret.__methods = nil;
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ret.__object = nil;
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ok = 0;
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} else {
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ret.__methods = __go_convert_interface_2(inter,
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i.__methods[0], 1);
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ret.__object = i.__object;
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ok = ret.__methods != nil;
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}
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}
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// Convert an empty interface to a pointer type.
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func ifaceE2T2P(inter *descriptor, e empty_interface) (ret *void, ok bool) {
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if(((uintptr_t)e.__type_descriptor&reflectFlags) != 0)
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runtime_panicstring("invalid interface value");
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if (!__go_type_descriptors_equal(inter, e.__type_descriptor)) {
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ret = nil;
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ok = 0;
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} else {
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ret = e.__object;
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ok = 1;
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}
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}
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// Convert a non-empty interface to a pointer type.
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func ifaceI2T2P(inter *descriptor, i interface) (ret *void, ok bool) {
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if (i.__methods == nil
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|| !__go_type_descriptors_equal(inter, i.__methods[0])) {
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ret = nil;
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ok = 0;
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} else {
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ret = i.__object;
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ok = 1;
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}
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}
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// Convert an empty interface to a non-pointer type.
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func ifaceE2T2(inter *descriptor, e empty_interface, ret *void) (ok bool) {
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if(((uintptr_t)e.__type_descriptor&reflectFlags) != 0)
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runtime_panicstring("invalid interface value");
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if (!__go_type_descriptors_equal(inter, e.__type_descriptor)) {
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__builtin_memset(ret, 0, inter->__size);
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ok = 0;
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} else {
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__builtin_memcpy(ret, e.__object, inter->__size);
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ok = 1;
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}
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}
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// Convert a non-empty interface to a non-pointer type.
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func ifaceI2T2(inter *descriptor, i interface, ret *void) (ok bool) {
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if (i.__methods == nil
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|| !__go_type_descriptors_equal(inter, i.__methods[0])) {
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__builtin_memset(ret, 0, inter->__size);
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ok = 0;
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} else {
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__builtin_memcpy(ret, i.__object, inter->__size);
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ok = 1;
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}
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}
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// Return whether we can convert an interface to a type.
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func ifaceI2Tp(to *descriptor, from *descriptor) (ok bool) {
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ok = __go_can_convert_to_interface(to, from);
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}
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