github.com/gidoBOSSftw5731/go/src@v0.0.0-20210226122457-d24b0edbf019/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 abi abiDesc
    27  	if rcvr != nil {
    28  		ft, _, abi = funcLayout((*funcType)(unsafe.Pointer(t.(*rtype))), rcvr.(*rtype))
    29  	} else {
    30  		ft, _, abi = funcLayout((*funcType)(unsafe.Pointer(t.(*rtype))), nil)
    31  	}
    32  	argSize = abi.stackCallArgsSize
    33  	retOffset = abi.retOffset
    34  	frametype = ft
    35  	for i := uint32(0); i < abi.stackPtrs.n; i++ {
    36  		stack = append(stack, abi.stackPtrs.data[i/8]>>(i%8)&1)
    37  	}
    38  	if ft.kind&kindGCProg != 0 {
    39  		panic("can't handle gc programs")
    40  	}
    41  	ptrs = ft.ptrdata != 0
    42  	if ptrs {
    43  		nptrs := ft.ptrdata / ptrSize
    44  		gcdata := ft.gcSlice(0, (nptrs+7)/8)
    45  		for i := uintptr(0); i < nptrs; i++ {
    46  			gc = append(gc, gcdata[i/8]>>(i%8)&1)
    47  		}
    48  	}
    49  	return
    50  }
    51  
    52  func TypeLinks() []string {
    53  	var r []string
    54  	sections, offset := typelinks()
    55  	for i, offs := range offset {
    56  		rodata := sections[i]
    57  		for _, off := range offs {
    58  			typ := (*rtype)(resolveTypeOff(unsafe.Pointer(rodata), off))
    59  			r = append(r, typ.String())
    60  		}
    61  	}
    62  	return r
    63  }
    64  
    65  var GCBits = gcbits
    66  
    67  func gcbits(interface{}) []byte // provided by runtime
    68  
    69  func MapBucketOf(x, y Type) Type {
    70  	return bucketOf(x.(*rtype), y.(*rtype))
    71  }
    72  
    73  func CachedBucketOf(m Type) Type {
    74  	t := m.(*rtype)
    75  	if Kind(t.kind&kindMask) != Map {
    76  		panic("not map")
    77  	}
    78  	tt := (*mapType)(unsafe.Pointer(t))
    79  	return tt.bucket
    80  }
    81  
    82  type EmbedWithUnexpMeth struct{}
    83  
    84  func (EmbedWithUnexpMeth) f() {}
    85  
    86  type pinUnexpMeth interface {
    87  	f()
    88  }
    89  
    90  var pinUnexpMethI = pinUnexpMeth(EmbedWithUnexpMeth{})
    91  
    92  func FirstMethodNameBytes(t Type) *byte {
    93  	_ = pinUnexpMethI
    94  
    95  	ut := t.uncommon()
    96  	if ut == nil {
    97  		panic("type has no methods")
    98  	}
    99  	m := ut.methods()[0]
   100  	mname := t.(*rtype).nameOff(m.name)
   101  	if *mname.data(0, "name flag field")&(1<<2) == 0 {
   102  		panic("method name does not have pkgPath *string")
   103  	}
   104  	return mname.bytes
   105  }
   106  
   107  type OtherPkgFields struct {
   108  	OtherExported   int
   109  	otherUnexported int
   110  }
   111  
   112  func IsExported(t Type) bool {
   113  	typ := t.(*rtype)
   114  	n := typ.nameOff(typ.str)
   115  	return n.isExported()
   116  }
   117  
   118  func ResolveReflectName(s string) {
   119  	resolveReflectName(newName(s, "", false))
   120  }
   121  
   122  type Buffer struct {
   123  	buf []byte
   124  }