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// Copyright 2023 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 objabi
import "sync"
// PkgSpecial indicates special build properties of a given runtime-related
// package.
type PkgSpecial struct {
// Runtime indicates that this package is "runtime" or imported by
// "runtime". This has several effects (which maybe should be split out):
//
// - Implicit allocation is disallowed.
//
// - Various runtime pragmas are enabled.
//
// - Optimizations are always enabled.
//
// This should be set for runtime and all packages it imports, and may be
// set for additional packages.
Runtime bool
// NoInstrument indicates this package should not receive sanitizer
// instrumentation. In many of these, instrumentation could cause infinite
// recursion. This is all runtime packages, plus those that support the
// sanitizers.
NoInstrument bool
// NoRaceFunc indicates functions in this package should not get
// racefuncenter/racefuncexit instrumentation Memory accesses in these
// packages are either uninteresting or will cause false positives.
NoRaceFunc bool
// AllowAsmABI indicates that assembly in this package is allowed to use ABI
// selectors in symbol names. Generally this is needed for packages that
// interact closely with the runtime package or have performance-critical
// assembly.
AllowAsmABI bool
}
var runtimePkgs = []string{
"runtime",
"runtime/internal/atomic",
"runtime/internal/math",
"runtime/internal/sys",
"runtime/internal/syscall",
"internal/abi",
"internal/bytealg",
"internal/chacha8rand",
"internal/coverage/rtcov",
"internal/cpu",
"internal/goarch",
"internal/godebugs",
"internal/goexperiment",
"internal/goos",
}
// extraNoInstrumentPkgs is the set of packages in addition to runtimePkgs that
// should have NoInstrument set.
var extraNoInstrumentPkgs = []string{
"runtime/race",
"runtime/msan",
"runtime/asan",
// We omit bytealg even though it's imported by runtime because it also
// backs a lot of package bytes. Currently we don't have a way to omit race
// instrumentation when used from the runtime while keeping race
// instrumentation when used from user code. Somehow this doesn't seem to
// cause problems, though we may be skating on thin ice. See #61204.
"-internal/bytealg",
}
var noRaceFuncPkgs = []string{"sync", "sync/atomic"}
var allowAsmABIPkgs = []string{
"runtime",
"reflect",
"syscall",
"internal/bytealg",
"internal/chacha8rand",
"runtime/internal/syscall",
"runtime/internal/startlinetest",
}
var (
pkgSpecials map[string]PkgSpecial
pkgSpecialsOnce sync.Once
)
// LookupPkgSpecial returns special build properties for the given package path.
func LookupPkgSpecial(pkgPath string) PkgSpecial {
pkgSpecialsOnce.Do(func() {
// Construct pkgSpecials from various package lists. This lets us use
// more flexible logic, while keeping the final map simple, and avoids
// the init-time cost of a map.
pkgSpecials = make(map[string]PkgSpecial)
set := func(elt string, f func(*PkgSpecial)) {
s := pkgSpecials[elt]
f(&s)
pkgSpecials[elt] = s
}
for _, pkg := range runtimePkgs {
set(pkg, func(ps *PkgSpecial) { ps.Runtime = true; ps.NoInstrument = true })
}
for _, pkg := range extraNoInstrumentPkgs {
if pkg[0] == '-' {
set(pkg[1:], func(ps *PkgSpecial) { ps.NoInstrument = false })
} else {
set(pkg, func(ps *PkgSpecial) { ps.NoInstrument = true })
}
}
for _, pkg := range noRaceFuncPkgs {
set(pkg, func(ps *PkgSpecial) { ps.NoRaceFunc = true })
}
for _, pkg := range allowAsmABIPkgs {
set(pkg, func(ps *PkgSpecial) { ps.AllowAsmABI = true })
}
})
return pkgSpecials[pkgPath]
}