[dev.regabi] cmd/compile: split out package reflectdata [generated]

[git-generate]

cd src/cmd/compile/internal/gc
rf '
	ex {
		import "cmd/compile/internal/base"
		thearch.LinkArch.Name -> base.Ctxt.Arch.Name
	}

	# Move out of reflect.go a few functions that should stay.
	mv addsignats obj.go
	mv deferstruct ssa.go

	# Export reflectdata API.
	mv zerosize ZeroSize
	mv hmap MapType
	mv bmap MapBucketType
	mv hiter MapIterType
	mv addsignat NeedRuntimeType
	mv typename TypePtr
	mv typenamesym TypeSym
	mv typesymprefix TypeSymPrefix
	mv itabsym ITabSym
	mv tracksym TrackSym
	mv zeroaddr ZeroAddr
	mv itabname ITabAddr
	mv ifaceMethodOffset InterfaceMethodOffset
	mv peekitabs CompileITabs
	mv addptabs CollectPTabs
	mv algtype AlgType
	mv dtypesym WriteType
	mv dumpbasictypes WriteBasicTypes
	mv dumpimportstrings WriteImportStrings
	mv dumpsignats WriteRuntimeTypes
	mv dumptabs WriteTabs
	mv eqinterface EqInterface
	mv eqstring EqString

	mv GCProg gcProg
	mv EqCanPanic eqCanPanic
	mv IsRegularMemory isRegularMemory
	mv Sig typeSig

	mv hashmem alg.go
	mv CollectPTabs genwrapper ZeroSize reflect.go
	mv alg.go reflect.go cmd/compile/internal/reflectdata
'

Change-Id: Iaae9da9e9fad5f772f5216004823ccff2ea8f139
Reviewed-on: https://go-review.googlesource.com/c/go/+/279475
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/cmd/compile/internal/gc/subr.go

@@ -6,9 +6,8 @@ package gc
 
 import (
 	"cmd/compile/internal/base"
-	"cmd/compile/internal/escape"
-	"cmd/compile/internal/inline"
 	"cmd/compile/internal/ir"
+	"cmd/compile/internal/reflectdata"
 	"cmd/compile/internal/typecheck"
 	"cmd/compile/internal/types"
 	"cmd/internal/src"
@@ -319,144 +318,9 @@ func cheapexpr(n ir.Node, init *ir.Nodes) ir.Node {
 	return copyexpr(n, n.Type(), init)
 }
 
-// Generate a wrapper function to convert from
-// a receiver of type T to a receiver of type U.
-// That is,
-//
-//	func (t T) M() {
-//		...
-//	}
-//
-// already exists; this function generates
-//
-//	func (u U) M() {
-//		u.M()
-//	}
-//
-// where the types T and U are such that u.M() is valid
-// and calls the T.M method.
-// The resulting function is for use in method tables.
-//
-//	rcvr - U
-//	method - M func (t T)(), a TFIELD type struct
-//	newnam - the eventual mangled name of this function
-func genwrapper(rcvr *types.Type, method *types.Field, newnam *types.Sym) {
-	if false && base.Flag.LowerR != 0 {
-		fmt.Printf("genwrapper rcvrtype=%v method=%v newnam=%v\n", rcvr, method, newnam)
-	}
-
-	// Only generate (*T).M wrappers for T.M in T's own package.
-	if rcvr.IsPtr() && rcvr.Elem() == method.Type.Recv().Type &&
-		rcvr.Elem().Sym() != nil && rcvr.Elem().Sym().Pkg != types.LocalPkg {
-		return
-	}
-
-	// Only generate I.M wrappers for I in I's own package
-	// but keep doing it for error.Error (was issue #29304).
-	if rcvr.IsInterface() && rcvr.Sym() != nil && rcvr.Sym().Pkg != types.LocalPkg && rcvr != types.ErrorType {
-		return
-	}
-
-	base.Pos = base.AutogeneratedPos
-	typecheck.DeclContext = ir.PEXTERN
-
-	tfn := ir.NewFuncType(base.Pos,
-		ir.NewField(base.Pos, typecheck.Lookup(".this"), nil, rcvr),
-		typecheck.NewFuncParams(method.Type.Params(), true),
-		typecheck.NewFuncParams(method.Type.Results(), false))
-
-	fn := typecheck.DeclFunc(newnam, tfn)
-	fn.SetDupok(true)
-
-	nthis := ir.AsNode(tfn.Type().Recv().Nname)
-
-	methodrcvr := method.Type.Recv().Type
-
-	// generate nil pointer check for better error
-	if rcvr.IsPtr() && rcvr.Elem() == methodrcvr {
-		// generating wrapper from *T to T.
-		n := ir.NewIfStmt(base.Pos, nil, nil, nil)
-		n.Cond = ir.NewBinaryExpr(base.Pos, ir.OEQ, nthis, typecheck.NodNil())
-		call := ir.NewCallExpr(base.Pos, ir.OCALL, typecheck.LookupRuntime("panicwrap"), nil)
-		n.Body = []ir.Node{call}
-		fn.Body.Append(n)
-	}
-
-	dot := typecheck.AddImplicitDots(ir.NewSelectorExpr(base.Pos, ir.OXDOT, nthis, method.Sym))
-
-	// generate call
-	// It's not possible to use a tail call when dynamic linking on ppc64le. The
-	// bad scenario is when a local call is made to the wrapper: the wrapper will
-	// call the implementation, which might be in a different module and so set
-	// 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) && !(thearch.LinkArch.Name == "ppc64le" && base.Ctxt.Flag_dynlink) {
-		// generate tail call: adjust pointer receiver and jump to embedded method.
-		left := dot.X // skip final .M
-		if !left.Type().IsPtr() {
-			left = typecheck.NodAddr(left)
-		}
-		as := ir.NewAssignStmt(base.Pos, nthis, typecheck.ConvNop(left, rcvr))
-		fn.Body.Append(as)
-		fn.Body.Append(ir.NewBranchStmt(base.Pos, ir.ORETJMP, ir.MethodSym(methodrcvr, method.Sym)))
-	} else {
-		fn.SetWrapper(true) // ignore frame for panic+recover matching
-		call := ir.NewCallExpr(base.Pos, ir.OCALL, dot, nil)
-		call.Args.Set(ir.ParamNames(tfn.Type()))
-		call.IsDDD = tfn.Type().IsVariadic()
-		if method.Type.NumResults() > 0 {
-			ret := ir.NewReturnStmt(base.Pos, nil)
-			ret.Results = []ir.Node{call}
-			fn.Body.Append(ret)
-		} else {
-			fn.Body.Append(call)
-		}
-	}
-
-	if false && base.Flag.LowerR != 0 {
-		ir.DumpList("genwrapper body", fn.Body)
-	}
-
-	typecheck.FinishFuncBody()
-	if base.Debug.DclStack != 0 {
-		types.CheckDclstack()
-	}
-
-	typecheck.Func(fn)
-	ir.CurFunc = fn
-	typecheck.Stmts(fn.Body)
-
-	// Inline calls within (*T).M wrappers. This is safe because we only
-	// generate those wrappers within the same compilation unit as (T).M.
-	// TODO(mdempsky): Investigate why we can't enable this more generally.
-	if rcvr.IsPtr() && rcvr.Elem() == method.Type.Recv().Type && rcvr.Elem().Sym() != nil {
-		inline.InlineCalls(fn)
-	}
-	escape.Batch([]*ir.Func{fn}, false)
-
-	ir.CurFunc = nil
-	typecheck.Target.Decls = append(typecheck.Target.Decls, fn)
-}
-
-func hashmem(t *types.Type) ir.Node {
-	sym := ir.Pkgs.Runtime.Lookup("memhash")
-
-	n := typecheck.NewName(sym)
-	ir.MarkFunc(n)
-	n.SetType(typecheck.NewFuncType(nil, []*ir.Field{
-		ir.NewField(base.Pos, nil, nil, types.NewPtr(t)),
-		ir.NewField(base.Pos, nil, nil, types.Types[types.TUINTPTR]),
-		ir.NewField(base.Pos, nil, nil, types.Types[types.TUINTPTR]),
-	}, []*ir.Field{
-		ir.NewField(base.Pos, nil, nil, types.Types[types.TUINTPTR]),
-	}))
-	return n
-}
-
 func ngotype(n ir.Node) *types.Sym {
 	if n.Type() != nil {
-		return typenamesym(n.Type())
+		return reflectdata.TypeSym(n.Type())
 	}
 	return nil
 }