cmd/compile: untangle Wrapper and ABIWrapper flags

Currently, there are Wrapper and ABIWrapper attributes. Wrapper
is set when compiler generates an wrapper function (e.g. method
wrapper). ABIWrapper is set when compiler generates an ABI
wrapper. It also sets Wrapper flag for ABI wrappers.

Currently, they have the following meanings:
- Wrapper flag hides the frame from (normal) traceback.
- Wrapper flag enables special panic+recover adjustment, so it
  can correctly recover when a wrapper function is deferred.
- ABIWrapper flag disables the panic+recover adjustment, because
  we never defer an ABI wrapper that can recover.

This CL changes them to:
- Both Wrapper and ABIWrapper flags hide the frame from (normal)
  traceback. (Setting one is enough.)
- Wrapper flag enables special panic+recover adjustment.
  ABIWrapper flag no longer has effect on this.

This makes it clearer if we do want an ABI wrapper that also does
the panic+recover adjustment. In the old mechanism we'd have to
unset ABIWrapper flag, even if the function is actually an ABI
wrapper. In the new mechanism we just need to set both ABIWrapper
and Wrapper flags.

Updates #40724.

Change-Id: I7fbc83f85d23676dc94db51dfda63dcacdf1fc19
Reviewed-on: https://go-review.googlesource.com/c/go/+/307235
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Austin Clements <austin@google.com>

src/cmd/compile/internal/ssagen/abi.go

@@ -289,13 +289,6 @@ func makeABIWrapper(f *ir.Func, wrapperABI obj.ABI) {
 
 	fn.SetABIWrapper(true)
 	fn.SetDupok(true)
-	// Set this as a wrapper so it doesn't appear in tracebacks.
-	// Having both ABIWrapper and Wrapper set suppresses obj's
-	// usual panic+recover handling for wrappers; that's okay
-	// because we're never going to defer a wrapper for a function
-	// that then recovers, so that's would just be unnecessary
-	// code in the ABI wrapper.
-	fn.SetWrapper(true)
 
 	// ABI0-to-ABIInternal wrappers will be mainly loading params from
 	// stack into registers (and/or storing stack locations back to

src/cmd/internal/obj/plist.go

@@ -136,7 +136,7 @@ func (ctxt *Link) InitTextSym(s *LSym, flag int) {
 		ctxt.Diag("symbol %s listed multiple times", s.Name)
 	}
 	name := strings.Replace(s.Name, "\"\"", ctxt.Pkgpath, -1)
-	s.Func().FuncID = objabi.GetFuncID(name, flag&WRAPPER != 0)
+	s.Func().FuncID = objabi.GetFuncID(name, flag&WRAPPER != 0 || flag&ABIWRAPPER != 0)
 	s.Func().FuncFlag = toFuncFlag(flag)
 	s.Set(AttrOnList, true)
 	s.Set(AttrDuplicateOK, flag&DUPOK != 0)

src/cmd/internal/obj/x86/obj6.go

@@ -645,7 +645,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 	}
 
 	var regg int16
-	if !p.From.Sym.NoSplit() || (p.From.Sym.Wrapper() && !p.From.Sym.ABIWrapper()) {
+	if !p.From.Sym.NoSplit() || p.From.Sym.Wrapper() {
 		if ctxt.Arch.Family == sys.AMD64 && objabi.Experiment.RegabiG && cursym.ABI() == obj.ABIInternal {
 			regg = REGG // use the g register directly in ABIInternal
 		} else {
@@ -713,7 +713,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 		p.To.Reg = REG_BP
 	}
 
-	if cursym.Func().Text.From.Sym.Wrapper() && !cursym.Func().Text.From.Sym.ABIWrapper() {
+	if cursym.Func().Text.From.Sym.Wrapper() {
 		// if g._panic != nil && g._panic.argp == FP {
 		//   g._panic.argp = bottom-of-frame
 		// }