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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"
)
// ReservedImports are import paths used internally for generated
// symbols by the compiler.
//
// The linker uses the magic symbol prefixes "go:" and "type:".
// Avoid potential confusion between import paths and symbols
// by rejecting these reserved imports for now. Also, people
// "can do weird things in GOPATH and we'd prefer they didn't
// do _that_ weird thing" (per rsc). See also #4257.
var ReservedImports = map[string]bool{
"go": true,
"type": true,
}
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)
}
sep := "."
if ReservedImports[prefix] {
sep = ":"
}
return linksym(prefix, prefix+sep+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 })
}
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