cmd/compile: disable tail call for method wrappers when RegabiArgs is enabled

Currently, the IR of tailcall does not connect the arguments with
the OTAILCALL node, so the arguments are not marshaled correctly.
Disable tail call for now.

Updates #40724.

Change-Id: I39de3ea8e19a23eb63768ab7282d2f870e9c266e
Reviewed-on: https://go-review.googlesource.com/c/go/+/307234
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>

diff --git a/src/cmd/compile/internal/reflectdata/reflect.go b/src/cmd/compile/internal/reflectdata/reflect.go
index 3a31e3c951c3795e40f8fd84f64345047c42bdfa..379735e86bb0f6e45ae58ad2be78e02b3693d18f 100644 (file)
--- a/src/cmd/compile/internal/reflectdata/reflect.go
+++ b/src/cmd/compile/internal/reflectdata/reflect.go
@@ -1770,7 +1770,11 @@ func methodWrapper(rcvr *types.Type, method *types.Field) *obj.LSym {
        // the TOC to the appropriate value for that module. But if it returns
        // directly to the wrapper's caller, nothing will reset it to the correct
        // value for that function.
-       if !base.Flag.Cfg.Instrumenting && rcvr.IsPtr() && methodrcvr.IsPtr() && method.Embedded != 0 && !types.IsInterfaceMethod(method.Type) && !(base.Ctxt.Arch.Name == "ppc64le" && base.Ctxt.Flag_dynlink) {
+       //
+       // Disable tailcall for RegabiArgs for now. The IR does not connect the
+       // arguments with the OTAILCALL node, and the arguments are not marshaled
+       // correctly.
+       if !base.Flag.Cfg.Instrumenting && rcvr.IsPtr() && methodrcvr.IsPtr() && method.Embedded != 0 && !types.IsInterfaceMethod(method.Type) && !(base.Ctxt.Arch.Name == "ppc64le" && base.Ctxt.Flag_dynlink) && !objabi.Experiment.RegabiArgs {
                // generate tail call: adjust pointer receiver and jump to embedded method.
                left := dot.X // skip final .M
                if !left.Type().IsPtr() {