github.com/zebozhuang/go@v0.0.0-20200207033046-f8a98f6f5c5d/src/reflect/export_test.go (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package reflect
     6  
     7  import "unsafe"
     8  
     9  // MakeRO returns a copy of v with the read-only flag set.
    10  func MakeRO(v Value) Value {
    11  	v.flag |= flagStickyRO
    12  	return v
    13  }
    14  
    15  // IsRO reports whether v's read-only flag is set.
    16  func IsRO(v Value) bool {
    17  	return v.flag&flagStickyRO != 0
    18  }
    19  
    20  var CallGC = &callGC
    21  
    22  const PtrSize = ptrSize
    23  
    24  func FuncLayout(t Type, rcvr Type) (frametype Type, argSize, retOffset uintptr, stack []byte, gc []byte, ptrs bool) {
    25  	var ft *rtype
    26  	var s *bitVector
    27  	if rcvr != nil {
    28  		ft, argSize, retOffset, s, _ = funcLayout(t.(*rtype), rcvr.(*rtype))
    29  	} else {
    30  		ft, argSize, retOffset, s, _ = funcLayout(t.(*rtype), nil)
    31  	}
    32  	frametype = ft
    33  	for i := uint32(0); i < s.n; i++ {
    34  		stack = append(stack, s.data[i/8]>>(i%8)&1)
    35  	}
    36  	if ft.kind&kindGCProg != 0 {
    37  		panic("can't handle gc programs")
    38  	}
    39  	gcdata := (*[1000]byte)(unsafe.Pointer(ft.gcdata))
    40  	for i := uintptr(0); i < ft.ptrdata/ptrSize; i++ {
    41  		gc = append(gc, gcdata[i/8]>>(i%8)&1)
    42  	}
    43  	ptrs = ft.kind&kindNoPointers == 0
    44  	return
    45  }
    46  
    47  func TypeLinks() []string {
    48  	var r []string
    49  	sections, offset := typelinks()
    50  	for i, offs := range offset {
    51  		rodata := sections[i]
    52  		for _, off := range offs {
    53  			typ := (*rtype)(resolveTypeOff(unsafe.Pointer(rodata), off))
    54  			r = append(r, typ.String())
    55  		}
    56  	}
    57  	return r
    58  }
    59  
    60  var GCBits = gcbits
    61  
    62  func gcbits(interface{}) []byte // provided by runtime
    63  
    64  func MapBucketOf(x, y Type) Type {
    65  	return bucketOf(x.(*rtype), y.(*rtype))
    66  }
    67  
    68  func CachedBucketOf(m Type) Type {
    69  	t := m.(*rtype)
    70  	if Kind(t.kind&kindMask) != Map {
    71  		panic("not map")
    72  	}
    73  	tt := (*mapType)(unsafe.Pointer(t))
    74  	return tt.bucket
    75  }
    76  
    77  type EmbedWithUnexpMeth struct{}
    78  
    79  func (EmbedWithUnexpMeth) f() {}
    80  
    81  type pinUnexpMeth interface {
    82  	f()
    83  }
    84  
    85  var pinUnexpMethI = pinUnexpMeth(EmbedWithUnexpMeth{})
    86  
    87  func FirstMethodNameBytes(t Type) *byte {
    88  	_ = pinUnexpMethI
    89  
    90  	ut := t.uncommon()
    91  	if ut == nil {
    92  		panic("type has no methods")
    93  	}
    94  	m := ut.methods()[0]
    95  	mname := t.(*rtype).nameOff(m.name)
    96  	if *mname.data(0)&(1<<2) == 0 {
    97  		panic("method name does not have pkgPath *string")
    98  	}
    99  	return mname.bytes
   100  }
   101  
   102  type OtherPkgFields struct {
   103  	OtherExported   int
   104  	otherUnexported int
   105  }
   106  
   107  func IsExported(t Type) bool {
   108  	typ := t.(*rtype)
   109  	n := typ.nameOff(typ.str)
   110  	return n.isExported()
   111  }
   112  
   113  func ResolveReflectName(s string) {
   114  	resolveReflectName(newName(s, "", "", false))
   115  }
   116  
   117  type Buffer struct {
   118  	buf []byte
   119  }