all: wire up swisstable maps

Use the new SwissTable-based map in internal/runtime/maps as the basis
for the runtime map when GOEXPERIMENT=swissmap.

Integration is complete enough to pass all.bash. Notable missing
features:

* Race integration / concurrent write detection
* Stack-allocated maps
* Specialized "fast" map variants
* Indirect key / elem

For #54766.

Cq-Include-Trybots: luci.golang.try:gotip-linux-ppc64_power10,gotip-linux-amd64-longtest-swissmap
Change-Id: Ie97b656b6d8e05c0403311ae08fef9f51756a639
Reviewed-on: https://go-review.googlesource.com/c/go/+/594596
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

1 files changed, 8 insertions, 34 deletions

diff --git a/src/internal/runtime/maps/export_test.go b/src/internal/runtime/maps/export_test.go
index e2512d332a..2856a7314e 100644
--- a/src/internal/runtime/maps/export_test.go
+++ b/src/internal/runtime/maps/export_test.go
@@ -6,7 +6,6 @@ package maps
 
 import (
 	"internal/abi"
-	sabi "internal/runtime/maps/internal/abi"
 	"unsafe"
 )
 
@@ -16,41 +15,16 @@ const DebugLog = debugLog
 
 var AlignUpPow2 = alignUpPow2
 
-type instantiatedGroup[K comparable, V any] struct {
-	ctrls ctrlGroup
-	slots [sabi.SwissMapGroupSlots]instantiatedSlot[K, V]
-}
-
-type instantiatedSlot[K comparable, V any] struct {
-	key  K
-	elem V
+func (t *table) Type() *abi.SwissMapType {
+	return t.typ
 }
 
-func NewTestTable[K comparable, V any](length uint64) *table {
-	var m map[K]V
-	mTyp := abi.TypeOf(m)
-	omt := (*abi.OldMapType)(unsafe.Pointer(mTyp))
-
-	var grp instantiatedGroup[K, V]
-	var slot instantiatedSlot[K, V]
-
-	mt := &sabi.SwissMapType{
-		Key:      omt.Key,
-		Elem:     omt.Elem,
-		Group:    abi.TypeOf(grp),
-		Hasher:   omt.Hasher,
-		SlotSize: unsafe.Sizeof(slot),
-		ElemOff:  unsafe.Offsetof(slot.elem),
-	}
-	if omt.NeedKeyUpdate() {
-		mt.Flags |= sabi.SwissMapNeedKeyUpdate
-	}
-	if omt.HashMightPanic() {
-		mt.Flags |= sabi.SwissMapHashMightPanic
-	}
-	return newTable(mt, length)
+// Returns the start address of the groups array.
+func (t *table) GroupsStart() unsafe.Pointer {
+	return t.groups.data
 }
 
-func (t *table) Type() *sabi.SwissMapType {
-	return t.typ
+// Returns the length of the groups array.
+func (t *table) GroupsLength() uintptr {
+	return uintptr(t.groups.lengthMask + 1)
 }