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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package base

import (
	"cmd/internal/obj"
)

var Ctxt *obj.Link

// TODO(mdempsky): These should probably be obj.Link methods.

// PkgLinksym returns the linker symbol for name within the given
// package prefix. For user packages, prefix should be the package
// path encoded with objabi.PathToPrefix.
func PkgLinksym(prefix, name string, abi obj.ABI) *obj.LSym {
	if name == "_" {
		// TODO(mdempsky): Cleanup callers and Fatalf instead.
		return linksym(prefix, "_", abi)
	}
	return linksym(prefix, prefix+"."+name, abi)
}

// Linkname returns the linker symbol for the given name as it might
// appear within a //go:linkname directive.
func Linkname(name string, abi obj.ABI) *obj.LSym {
	return linksym("_", name, abi)
}

// linksym is an internal helper function for implementing the above
// exported APIs.
func linksym(pkg, name string, abi obj.ABI) *obj.LSym {
	return Ctxt.LookupABIInit(name, abi, func(r *obj.LSym) { r.Pkg = pkg })
}