go语言中map、slice、chan底层数据布局是怎样的

map：rutime包下的map中的hmap

1. // A header for a Go map.
2. type hmap struct {
3.         // Note: the format of the hmap is also encoded in cmd/compile/internal/reflectdata/reflect.go.
4.         // Make sure this stays in sync with the compiler's definition.
5.         count     int // # live cells == size of map.  Must be first (used by len() builtin)
6.         flags     uint8
7.         B         uint8  // log_2 of # of buckets (can hold up to loadFactor * 2^B items)
8.         noverflow uint16 // approximate number of overflow buckets; see incrnoverflow for details
9.         hash0     uint32 // hash seed
11.         buckets    unsafe.Pointer // array of 2^B Buckets. may be nil if count==0.
12.         oldbuckets unsafe.Pointer // previous bucket array of half the size, non-nil only when growing
13.         nevacuate  uintptr        // progress counter for evacuation (buckets less than this have been evacuated)
15.         extra *mapextra // optional fields
16. }

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slice：runtime包下的slice中的slice

1. type slice struct {
2.         array unsafe.Pointer
3.         len   int
4.         cap   int
5. }

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chan: runtime包下的chan中的hchan

1. type hchan struct {
2.         qcount   uint           // total data in the queue
3.         dataqsiz uint           // size of the circular queue
4.         buf      unsafe.Pointer // points to an array of dataqsiz elements
5.         elemsize uint16
6.         closed   uint32
7.         elemtype *_type // element type
8.         sendx    uint   // send index
9.         recvx    uint   // receive index
10.         recvq    waitq  // list of recv waiters
11.         sendq    waitq  // list of send waiters
13.         // lock protects all fields in hchan, as well as several
14.         // fields in sudogs blocked on this channel.
15.         //
16.         // Do not change another G's status while holding this lock
17.         // (in particular, do not ready a G), as this can deadlock
18.         // with stack shrinking.
19.         lock mutex
20. }

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