cmd/compile: interleave devirtualization and inlining

This CL interleaves devirtualization and inlining, so that
devirtualized calls can be inlined.

Fixes #52193.

Change-Id: I681e7c55bdb90ebf6df315d334e7a58f05110d9c
Reviewed-on: https://go-review.googlesource.com/c/go/+/528321
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Bypass: Matthew Dempsky <mdempsky@google.com>

1 files changed, 3 insertions, 15 deletions

diff --git a/src/cmd/compile/internal/devirtualize/devirtualize.go b/src/cmd/compile/internal/devirtualize/devirtualize.go
index 9e26f66a1c..5d1b952627 100644
--- a/src/cmd/compile/internal/devirtualize/devirtualize.go
+++ b/src/cmd/compile/internal/devirtualize/devirtualize.go
@@ -18,22 +18,9 @@ import (
 	"cmd/compile/internal/types"
 )
 
-// Static devirtualizes calls within fn where possible when the concrete callee
+// StaticCall devirtualizes the given call if possible when the concrete callee
 // is available statically.
-func Static(fn *ir.Func) {
-	ir.CurFunc = fn
-
-	ir.VisitList(fn.Body, func(n ir.Node) {
-		switch n := n.(type) {
-		case *ir.CallExpr:
-			staticCall(n)
-		}
-	})
-}
-
-// staticCall devirtualizes the given call if possible when the concrete callee
-// is available statically.
-func staticCall(call *ir.CallExpr) {
+func StaticCall(call *ir.CallExpr) {
 	// For promoted methods (including value-receiver methods promoted
 	// to pointer-receivers), the interface method wrapper may contain
 	// expressions that can panic (e.g., ODEREF, ODOTPTR,
@@ -51,6 +38,7 @@ func staticCall(call *ir.CallExpr) {
 	if call.Op() != ir.OCALLINTER {
 		return
 	}
+
 	sel := call.Fun.(*ir.SelectorExpr)
 	r := ir.StaticValue(sel.X)
 	if r.Op() != ir.OCONVIFACE {