[dev.regabi] cmd/compile: separate CommStmt from CaseStmt

Like go/ast and cmd/compile/internal/syntax before it, package ir now
has separate concrete representations for switch-case clauses and
select-communication clauses.

Passes toolstash -cmp.

Change-Id: I32667cbae251fe7881be0f434388478433b2414f
Reviewed-on: https://go-review.googlesource.com/c/go/+/280443
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/cmd/compile/internal/typecheck/iimport.go b/src/cmd/compile/internal/typecheck/iimport.go
index fd8314b662..ba7ea2f156 100644
--- a/src/cmd/compile/internal/typecheck/iimport.go
+++ b/src/cmd/compile/internal/typecheck/iimport.go
@@ -789,6 +789,14 @@ func (r *importReader) caseList(switchExpr ir.Node) []*ir.CaseStmt {
 	return cases
 }
 
+func (r *importReader) commList() []*ir.CommStmt {
+	cases := make([]*ir.CommStmt, r.uint64())
+	for i := range cases {
+		cases[i] = ir.NewCommStmt(r.pos(), r.stmtList(), r.stmtList())
+	}
+	return cases
+}
+
 func (r *importReader) exprList() []ir.Node {
 	var list []ir.Node
 	for {
@@ -1035,7 +1043,7 @@ func (r *importReader) node() ir.Node {
 	case ir.OSELECT:
 		pos := r.pos()
 		init := r.stmtList()
-		n := ir.NewSelectStmt(pos, r.caseList(nil))
+		n := ir.NewSelectStmt(pos, r.commList())
 		n.PtrInit().Set(init)
 		return n