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cmd/compile: refactor walkIndexMap

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So all runtime map functions will use the same code path, make it easier
for future CL to handle stack object for map key.

Passes toolstash -cmp.

For #43753

Change-Id: I374fa4e351c1eba079e2ccb637b1ef5adad1488f
Reviewed-on: https://go-review.googlesource.com/c/go/+/321713
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Cuong Manh Le 2021-05-24 12:15:17 +07:00
parent 60be4ec096
commit 209521c3e3
3 changed files with 28 additions and 33 deletions
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2
src/cmd/compile/internal/walk/assign.go
View File

@ -157,7 +157,7 @@ func walkAssignMapRead(init *ir.Nodes, n *ir.AssignListStmt) ir.Node {
t := r.X.Type()
fast := mapfast(t)
key := mapKeyArg(fast, r, r.Index)
key := mapKeyArg(fast, r, r.Index, false)
// from:
// a,b = m[i]

2
src/cmd/compile/internal/walk/builtin.go
View File

@ -214,7 +214,7 @@ func walkDelete(init *ir.Nodes, n *ir.CallExpr) ir.Node {
t := map_.Type()
fast := mapfast(t)
key = mapKeyArg(fast, n, key)
key = mapKeyArg(fast, n, key, false)
return mkcall1(mapfndel(mapdelete[fast], t), nil, init, reflectdata.TypePtr(t), map_, key)
}

57
src/cmd/compile/internal/walk/expr.go
View File

@ -723,21 +723,23 @@ func walkIndex(n *ir.IndexExpr, init *ir.Nodes) ir.Node {
}
// mapKeyArg returns an expression for key that is suitable to be passed
// as the key argument for mapaccess and mapdelete functions.
// as the key argument for runtime map* functions.
// n is is the map indexing or delete Node (to provide Pos).
// Note: this is not used for mapassign, which does distinguish pointer vs.
// integer key.
func mapKeyArg(fast int, n, key ir.Node) ir.Node {
switch fast {
case mapslow:
func mapKeyArg(fast int, n, key ir.Node, assigned bool) ir.Node {
if fast == mapslow {
// standard version takes key by reference.
// order.expr made sure key is addressable.
// orderState.expr made sure key is addressable.
return typecheck.NodAddr(key)
}
if assigned {
// mapassign does distinguish pointer vs. integer key.
return key
}
// mapaccess and mapdelete don't distinguish pointer vs. integer key.
switch fast {
case mapfast32ptr:
// mapaccess and mapdelete don't distinguish pointer vs. integer key.
return ir.NewConvExpr(n.Pos(), ir.OCONVNOP, types.Types[types.TUINT32], key)
case mapfast64ptr:
// mapaccess and mapdelete don't distinguish pointer vs. integer key.
return ir.NewConvExpr(n.Pos(), ir.OCONVNOP, types.Types[types.TUINT64], key)
default:
// fast version takes key by value.
@ -746,34 +748,27 @@ func mapKeyArg(fast int, n, key ir.Node) ir.Node {
}
// walkIndexMap walks an OINDEXMAP node.
// It replaces m[k] with *map{access1,assign}(maptype, m, &k)
func walkIndexMap(n *ir.IndexExpr, init *ir.Nodes) ir.Node {
// Replace m[k] with *map{access1,assign}(maptype, m, &k)
n.X = walkExpr(n.X, init)
n.Index = walkExpr(n.Index, init)
map_ := n.X
key := n.Index
t := map_.Type()
var call *ir.CallExpr
if n.Assigned {
// This m[k] expression is on the left-hand side of an assignment.
fast := mapfast(t)
if fast == mapslow {
// standard version takes key by reference.
// order.expr made sure key is addressable.
key = typecheck.NodAddr(key)
}
call = mkcall1(mapfn(mapassign[fast], t, false), nil, init, reflectdata.TypePtr(t), map_, key)
} else {
// m[k] is not the target of an assignment.
fast := mapfast(t)
key = mapKeyArg(fast, n, key)
if w := t.Elem().Size(); w <= zeroValSize {
call = mkcall1(mapfn(mapaccess1[fast], t, false), types.NewPtr(t.Elem()), init, reflectdata.TypePtr(t), map_, key)
} else {
z := reflectdata.ZeroAddr(w)
call = mkcall1(mapfn("mapaccess1_fat", t, true), types.NewPtr(t.Elem()), init, reflectdata.TypePtr(t), map_, key, z)
}
fast := mapfast(t)
key := mapKeyArg(fast, n, n.Index, n.Assigned)
args := []ir.Node{reflectdata.TypePtr(t), map_, key}
var mapFn ir.Node
switch {
case n.Assigned:
mapFn = mapfn(mapassign[fast], t, false)
case t.Elem().Size() > zeroValSize:
args = append(args, reflectdata.ZeroAddr(t.Elem().Size()))
mapFn = mapfn("mapaccess1_fat", t, true)
default:
mapFn = mapfn(mapaccess1[fast], t, false)
}
call := mkcall1(mapFn, nil, init, args...)
call.SetType(types.NewPtr(t.Elem()))
call.MarkNonNil() // mapaccess1* and mapassign always return non-nil pointers.
star := ir.NewStarExpr(base.Pos, call)