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// Copyright 2009 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.
// Runtime type representation.
typedef struct Type Type;
typedef struct UncommonType UncommonType;
typedef struct InterfaceType InterfaceType;
typedef struct Method Method;
typedef struct IMethod IMethod;
typedef struct SliceType SliceType;
typedef struct FuncType FuncType;
// Needs to be in sync with ../../cmd/ld/decodesym.c:/^commonsize and pkg/reflect/type.go:/type.
struct Type
{
uintptr size;
uint32 hash;
uint8 _unused;
uint8 align;
uint8 fieldAlign;
uint8 kind;
void* alg;
// gc stores type info required for garbage collector.
// If (kind&KindGCProg)==0, then gc[0] points at sparse GC bitmap
// (no indirection), 4 bits per word.
// If (kind&KindGCProg)!=0, then gc[1] points to a compiler-generated
// read-only GC program; and gc[0] points to BSS space for sparse GC bitmap.
// For huge types (>MaxGCMask), runtime unrolls the program directly into
// GC bitmap and gc[0] is not used. For moderately-sized types, runtime
// unrolls the program into gc[0] space on first use. The first byte of gc[0]
// (gc[0][0]) contains 'unroll' flag saying whether the program is already
// unrolled into gc[0] or not.
uintptr gc[2];
String *string;
UncommonType *x;
Type *ptrto;
byte *zero; // ptr to the zero value for this type
};
struct Method
{
String *name;
String *pkgPath;
Type *mtyp;
Type *typ;
void (*ifn)(void);
void (*tfn)(void);
};
struct UncommonType
{
String *name;
String *pkgPath;
Slice mhdr;
Method m[];
};
struct IMethod
{
String *name;
String *pkgPath;
Type *type;
};
struct InterfaceType
{
Type typ;
Slice mhdr;
IMethod m[];
};
struct MapType
{
Type typ;
Type *key;
Type *elem;
Type *bucket; // internal type representing a hash bucket
Type *hmap; // internal type representing a Hmap
uint8 keysize; // size of key slot
bool indirectkey; // store ptr to key instead of key itself
uint8 valuesize; // size of value slot
bool indirectvalue; // store ptr to value instead of value itself
uint16 bucketsize; // size of bucket
};
struct ChanType
{
Type typ;
Type *elem;
uintptr dir;
};
struct SliceType
{
Type typ;
Type *elem;
};
struct FuncType
{
Type typ;
bool dotdotdot;
Slice in;
Slice out;
};
struct PtrType
{
Type typ;
Type *elem;
};
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