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cmd/compile: remove dynamic entry handling from sinit/maplit

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The order pass now handles all the dynamic entries.

Update #26552

Followup to CL 174417

Change-Id: Ie924cadb0e0ba36c423868f654f13040100b44c6
Reviewed-on: https://go-review.googlesource.com/c/go/+/174498
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Keith Randall 2019-04-30 09:47:19 -07:00 committed by Keith Randall
parent 70b890ce3b
commit 85387aa364
1 changed files with 17 additions and 35 deletions
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52
src/cmd/compile/internal/gc/sinit.go
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@ -650,6 +650,8 @@ func getdyn(n *Node, top bool) initGenType {
// isStaticCompositeLiteral reports whether n is a compile-time constant.
func isStaticCompositeLiteral(n *Node) bool {
switch n.Op {
case ONAME:
return n.Class() == PEXTERN && n.Name != nil && n.Name.Readonly()
case OSLICELIT:
return false
case OARRAYLIT:
@ -954,26 +956,22 @@ func maplit(n *Node, m *Node, init *Nodes) {
a.List.Set2(typenod(n.Type), nodintconst(int64(n.List.Len())))
litas(m, a, init)
// Split the initializers into static and dynamic.
var stat, dyn []*Node
for _, r := range n.List.Slice() {
if r.Op != OKEY {
Fatalf("maplit: rhs not OKEY: %v", r)
}
if isStaticCompositeLiteral(r.Left) && isStaticCompositeLiteral(r.Right) {
stat = append(stat, r)
} else {
dyn = append(dyn, r)
entries := n.List.Slice()
// The order pass already removed any dynamic (runtime-computed) entries.
// All remaining entries are static. Double-check that.
for _, r := range entries {
if !isStaticCompositeLiteral(r.Left) || !isStaticCompositeLiteral(r.Right) {
Fatalf("maplit: entry is not a literal: %v", r)
}
}
// Add static entries.
if len(stat) > 25 {
// For a large number of static entries, put them in an array and loop.
if len(entries) > 25 {
// For a large number of entries, put them in an array and loop.
// build types [count]Tindex and [count]Tvalue
tk := types.NewArray(n.Type.Key(), int64(len(stat)))
te := types.NewArray(n.Type.Elem(), int64(len(stat)))
tk := types.NewArray(n.Type.Key(), int64(len(entries)))
te := types.NewArray(n.Type.Elem(), int64(len(entries)))
// TODO(josharian): suppress alg generation for these types?
dowidth(tk)
@ -987,7 +985,7 @@ func maplit(n *Node, m *Node, init *Nodes) {
datak := nod(OARRAYLIT, nil, nil)
datae := nod(OARRAYLIT, nil, nil)
for _, r := range stat {
for _, r := range entries {
datak.List.Append(r.Left)
datae.List.Append(r.Right)
}
@ -1018,21 +1016,9 @@ func maplit(n *Node, m *Node, init *Nodes) {
loop = typecheck(loop, ctxStmt)
loop = walkstmt(loop)
init.Append(loop)
} else {
// For a small number of static entries, just add them directly.
addMapEntries(m, stat, init)
}
// Add dynamic entries.
addMapEntries(m, dyn, init)
}
func addMapEntries(m *Node, dyn []*Node, init *Nodes) {
if len(dyn) == 0 {
return
}
nerr := nerrors
// For a small number of entries, just add them directly.
// Build list of var[c] = expr.
// Use temporaries so that mapassign1 can have addressable key, elem.
@ -1040,7 +1026,7 @@ func addMapEntries(m *Node, dyn []*Node, init *Nodes) {
tmpkey := temp(m.Type.Key())
tmpelem := temp(m.Type.Elem())
for _, r := range dyn {
for _, r := range entries {
index, elem := r.Left, r.Right
setlineno(index)
@ -1060,13 +1046,9 @@ func addMapEntries(m *Node, dyn []*Node, init *Nodes) {
a = typecheck(a, ctxStmt)
a = walkstmt(a)
init.Append(a)
if nerr != nerrors {
break
}
}
a := nod(OVARKILL, tmpkey, nil)
a = nod(OVARKILL, tmpkey, nil)
a = typecheck(a, ctxStmt)
init.Append(a)
a = nod(OVARKILL, tmpelem, nil)