3b8dffe701
Use kindNoPointers as 6g does. * Make-lang.in (go/expressions.o): Depend on $(GO_RUNTIME_H). From-SVN: r175008
193 lines
5.6 KiB
C
193 lines
5.6 KiB
C
/* go-reflect.c -- implement unsafe.Reflect and unsafe.Typeof 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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#include <stdlib.h>
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#include <stdint.h>
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#include "interface.h"
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#include "go-alloc.h"
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#include "go-panic.h"
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#include "go-string.h"
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#include "go-type.h"
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/* For field alignment. */
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struct field_align
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{
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char c;
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struct __go_type_descriptor *p;
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};
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/* The type descriptors in the runtime package. */
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extern const struct __go_type_descriptor ptr_bool_descriptor
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asm ("__go_td_pN30_libgo_runtime.runtime.BoolType");
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extern const struct __go_type_descriptor ptr_float_descriptor
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asm ("__go_td_pN31_libgo_runtime.runtime.FloatType");
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extern const struct __go_type_descriptor ptr_complex_descriptor
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asm ("__go_td_pN33_libgo_runtime.runtime.ComplexType");
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extern const struct __go_type_descriptor ptr_int_descriptor
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asm ("__go_td_pN29_libgo_runtime.runtime.IntType");
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extern const struct __go_type_descriptor ptr_uint_descriptor
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asm ("__go_td_pN30_libgo_runtime.runtime.UintType");
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extern const struct __go_type_descriptor ptr_string_descriptor
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asm ("__go_td_pN32_libgo_runtime.runtime.StringType");
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extern const struct __go_type_descriptor ptr_unsafe_pointer_decriptor
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asm ("__go_td_pN39_libgo_runtime.runtime.UnsafePointerType");
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extern const struct __go_type_descriptor ptr_array_descriptor
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asm ("__go_td_pN31_libgo_runtime.runtime.ArrayType");
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extern const struct __go_type_descriptor ptr_slice_descriptor
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asm ("__go_td_pN31_libgo_runtime.runtime.SliceType");
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extern const struct __go_type_descriptor ptr_chan_descriptor
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asm ("__go_td_pN30_libgo_runtime.runtime.ChanType");
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extern const struct __go_type_descriptor ptr_func_descriptor
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asm ("__go_td_pN30_libgo_runtime.runtime.FuncType");
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extern const struct __go_type_descriptor ptr_interface_descriptor
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asm ("__go_td_pN35_libgo_runtime.runtime.InterfaceType");
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extern const struct __go_type_descriptor ptr_map_descriptor
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asm ("__go_td_pN29_libgo_runtime.runtime.MapType");
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extern const struct __go_type_descriptor ptr_ptr_descriptor
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asm ("__go_td_pN29_libgo_runtime.runtime.PtrType");
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extern const struct __go_type_descriptor ptr_struct_descriptor
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asm ("__go_td_pN32_libgo_runtime.runtime.StructType");
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const struct __go_type_descriptor *
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get_descriptor (int code)
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{
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switch (code & GO_CODE_MASK)
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{
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case GO_BOOL:
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return &ptr_bool_descriptor;
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case GO_FLOAT32:
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case GO_FLOAT64:
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return &ptr_float_descriptor;
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case GO_COMPLEX64:
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case GO_COMPLEX128:
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return &ptr_complex_descriptor;
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case GO_INT16:
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case GO_INT32:
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case GO_INT64:
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case GO_INT8:
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case GO_INT:
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return &ptr_int_descriptor;
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case GO_UINT16:
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case GO_UINT32:
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case GO_UINT64:
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case GO_UINT8:
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case GO_UINTPTR:
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case GO_UINT:
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return &ptr_uint_descriptor;
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case GO_STRING:
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return &ptr_string_descriptor;
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case GO_UNSAFE_POINTER:
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return &ptr_unsafe_pointer_decriptor;
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case GO_ARRAY:
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return &ptr_array_descriptor;
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case GO_SLICE:
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return &ptr_slice_descriptor;
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case GO_CHAN:
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return &ptr_chan_descriptor;
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case GO_FUNC:
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return &ptr_func_descriptor;
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case GO_INTERFACE:
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return &ptr_interface_descriptor;
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case GO_MAP:
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return &ptr_map_descriptor;
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case GO_PTR:
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return &ptr_ptr_descriptor;
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case GO_STRUCT:
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return &ptr_struct_descriptor;
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default:
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abort ();
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}
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}
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/* Implement unsafe.Reflect. */
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struct reflect_ret
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{
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struct __go_empty_interface rettype;
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void *addr;
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};
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struct reflect_ret Reflect (struct __go_empty_interface)
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asm ("libgo_unsafe.unsafe.Reflect");
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struct reflect_ret
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Reflect (struct __go_empty_interface e)
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{
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struct reflect_ret ret;
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if (((uintptr_t) e.__type_descriptor & reflectFlags) != 0)
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__go_panic_msg ("invalid interface value");
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if (e.__type_descriptor == NULL)
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{
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ret.rettype.__type_descriptor = NULL;
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ret.rettype.__object = NULL;
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ret.addr = NULL;
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}
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else
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{
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size_t size;
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ret.rettype.__type_descriptor =
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get_descriptor (e.__type_descriptor->__code);
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/* This memcpy is really just an assignment of a const pointer
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to a non-const pointer. FIXME: We should canonicalize this
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pointer, so that for a given type we always return the same
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pointer. */
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__builtin_memcpy (&ret.rettype.__object, &e.__type_descriptor,
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sizeof (void *));
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/* Make a copy of the value. */
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size = e.__type_descriptor->__size;
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if (size <= sizeof (uint64_t))
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ret.addr = __go_alloc (sizeof (uint64_t));
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else
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ret.addr = __go_alloc (size);
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if (__go_is_pointer_type (e.__type_descriptor))
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*(void **) ret.addr = e.__object;
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else
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__builtin_memcpy (ret.addr, e.__object, size);
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}
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return ret;
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}
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/* Implement unsafe.Typeof. */
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struct __go_empty_interface Typeof (struct __go_empty_interface)
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asm ("libgo_unsafe.unsafe.Typeof");
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struct __go_empty_interface
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Typeof (const struct __go_empty_interface e)
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{
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struct __go_empty_interface ret;
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if (((uintptr_t) e.__type_descriptor & reflectFlags) != 0)
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__go_panic_msg ("invalid interface value");
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if (e.__type_descriptor == NULL)
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{
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ret.__type_descriptor = NULL;
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ret.__object = NULL;
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}
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else
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{
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ret.__type_descriptor = get_descriptor (e.__type_descriptor->__code);
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/* This memcpy is really just an assignment of a const pointer
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to a non-const pointer. FIXME: We should canonicalize this
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pointer, so that for a given type we always return the same
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pointer. */
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__builtin_memcpy (&ret.__object, &e.__type_descriptor, sizeof (void *));
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}
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return ret;
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}
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