| // Copyright 2017 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 test |
| |
| import ( |
| "bufio" |
| "internal/testenv" |
| "io" |
| "math/bits" |
| "os/exec" |
| "regexp" |
| "runtime" |
| "strings" |
| "testing" |
| ) |
| |
| // TestIntendedInlining tests that specific functions are inlined. |
| // This allows refactoring for code clarity and re-use without fear that |
| // changes to the compiler will cause silent performance regressions. |
| func TestIntendedInlining(t *testing.T) { |
| if testing.Short() && testenv.Builder() == "" { |
| t.Skip("skipping in short mode") |
| } |
| testenv.MustHaveGoRun(t) |
| t.Parallel() |
| |
| // want is the list of function names (by package) that should |
| // be inlinable. If they have no callers in their packages, they |
| // might not actually be inlined anywhere. |
| want := map[string][]string{ |
| "runtime": { |
| "add", |
| "acquirem", |
| "add1", |
| "addb", |
| "adjustpanics", |
| "adjustpointer", |
| "alignDown", |
| "alignUp", |
| "bucketMask", |
| "bucketShift", |
| "chanbuf", |
| "deferArgs", |
| "deferclass", |
| "evacuated", |
| "fastlog2", |
| "fastrand", |
| "float64bits", |
| "funcPC", |
| "getArgInfoFast", |
| "getm", |
| "getMCache", |
| "isDirectIface", |
| "itabHashFunc", |
| "noescape", |
| "pcvalueCacheKey", |
| "readUnaligned32", |
| "readUnaligned64", |
| "releasem", |
| "roundupsize", |
| "stackmapdata", |
| "stringStructOf", |
| "subtract1", |
| "subtractb", |
| "tophash", |
| "totaldefersize", |
| "(*bmap).keys", |
| "(*bmap).overflow", |
| "(*waitq).enqueue", |
| |
| // GC-related ones |
| "cgoInRange", |
| "gclinkptr.ptr", |
| "guintptr.ptr", |
| "heapBits.bits", |
| "heapBits.isPointer", |
| "heapBits.morePointers", |
| "heapBits.next", |
| "heapBitsForAddr", |
| "markBits.isMarked", |
| "muintptr.ptr", |
| "puintptr.ptr", |
| "spanOf", |
| "spanOfUnchecked", |
| "(*gcWork).putFast", |
| "(*gcWork).tryGetFast", |
| "(*guintptr).set", |
| "(*markBits).advance", |
| "(*mspan).allocBitsForIndex", |
| "(*mspan).base", |
| "(*mspan).markBitsForBase", |
| "(*mspan).markBitsForIndex", |
| "(*muintptr).set", |
| "(*puintptr).set", |
| }, |
| "runtime/internal/sys": {}, |
| "runtime/internal/math": { |
| "MulUintptr", |
| }, |
| "bytes": { |
| "(*Buffer).Bytes", |
| "(*Buffer).Cap", |
| "(*Buffer).Len", |
| "(*Buffer).Grow", |
| "(*Buffer).Next", |
| "(*Buffer).Read", |
| "(*Buffer).ReadByte", |
| "(*Buffer).Reset", |
| "(*Buffer).String", |
| "(*Buffer).UnreadByte", |
| "(*Buffer).tryGrowByReslice", |
| }, |
| "compress/flate": { |
| "byLiteral.Len", |
| "byLiteral.Less", |
| "byLiteral.Swap", |
| "(*dictDecoder).tryWriteCopy", |
| }, |
| "encoding/base64": { |
| "assemble32", |
| "assemble64", |
| }, |
| "unicode/utf8": { |
| "FullRune", |
| "FullRuneInString", |
| "RuneLen", |
| "ValidRune", |
| }, |
| "reflect": { |
| "Value.CanAddr", |
| "Value.CanSet", |
| "Value.CanInterface", |
| "Value.IsValid", |
| "Value.pointer", |
| "add", |
| "align", |
| "flag.mustBe", |
| "flag.mustBeAssignable", |
| "flag.mustBeExported", |
| "flag.kind", |
| "flag.ro", |
| }, |
| "regexp": { |
| "(*bitState).push", |
| }, |
| "math/big": { |
| "bigEndianWord", |
| // The following functions require the math_big_pure_go build tag. |
| "addVW", |
| "subVW", |
| }, |
| "math/rand": { |
| "(*rngSource).Int63", |
| "(*rngSource).Uint64", |
| }, |
| "net": { |
| "(*UDPConn).ReadFromUDP", |
| }, |
| } |
| |
| if runtime.GOARCH != "386" && runtime.GOARCH != "mips64" && runtime.GOARCH != "mips64le" && runtime.GOARCH != "riscv64" { |
| // nextFreeFast calls sys.Ctz64, which on 386 is implemented in asm and is not inlinable. |
| // We currently don't have midstack inlining so nextFreeFast is also not inlinable on 386. |
| // On mips64x and riscv64, Ctz64 is not intrinsified and causes nextFreeFast too expensive |
| // to inline (Issue 22239). |
| want["runtime"] = append(want["runtime"], "nextFreeFast") |
| } |
| if runtime.GOARCH != "386" { |
| // As explained above, Ctz64 and Ctz32 are not Go code on 386. |
| // The same applies to Bswap32. |
| want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "Ctz64") |
| want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "Ctz32") |
| want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "Bswap32") |
| } |
| if bits.UintSize == 64 { |
| // mix is only defined on 64-bit architectures |
| want["runtime"] = append(want["runtime"], "mix") |
| } |
| |
| switch runtime.GOARCH { |
| case "386", "wasm", "arm": |
| default: |
| // TODO(mvdan): As explained in /test/inline_sync.go, some |
| // architectures don't have atomic intrinsics, so these go over |
| // the inlining budget. Move back to the main table once that |
| // problem is solved. |
| want["sync"] = []string{ |
| "(*Mutex).Lock", |
| "(*Mutex).Unlock", |
| "(*RWMutex).RLock", |
| "(*RWMutex).RUnlock", |
| "(*Once).Do", |
| } |
| } |
| |
| // Functions that must actually be inlined; they must have actual callers. |
| must := map[string]bool{ |
| "compress/flate.byLiteral.Len": true, |
| "compress/flate.byLiteral.Less": true, |
| "compress/flate.byLiteral.Swap": true, |
| } |
| |
| notInlinedReason := make(map[string]string) |
| pkgs := make([]string, 0, len(want)) |
| for pname, fnames := range want { |
| pkgs = append(pkgs, pname) |
| for _, fname := range fnames { |
| fullName := pname + "." + fname |
| if _, ok := notInlinedReason[fullName]; ok { |
| t.Errorf("duplicate func: %s", fullName) |
| } |
| notInlinedReason[fullName] = "unknown reason" |
| } |
| } |
| |
| args := append([]string{"build", "-a", "-gcflags=all=-m -m", "-tags=math_big_pure_go"}, pkgs...) |
| cmd := testenv.CleanCmdEnv(exec.Command(testenv.GoToolPath(t), args...)) |
| pr, pw := io.Pipe() |
| cmd.Stdout = pw |
| cmd.Stderr = pw |
| cmdErr := make(chan error, 1) |
| go func() { |
| cmdErr <- cmd.Run() |
| pw.Close() |
| }() |
| scanner := bufio.NewScanner(pr) |
| curPkg := "" |
| canInline := regexp.MustCompile(`: can inline ([^ ]*)`) |
| haveInlined := regexp.MustCompile(`: inlining call to ([^ ]*)`) |
| cannotInline := regexp.MustCompile(`: cannot inline ([^ ]*): (.*)`) |
| for scanner.Scan() { |
| line := scanner.Text() |
| if strings.HasPrefix(line, "# ") { |
| curPkg = line[2:] |
| continue |
| } |
| if m := haveInlined.FindStringSubmatch(line); m != nil { |
| fname := m[1] |
| delete(notInlinedReason, curPkg+"."+fname) |
| continue |
| } |
| if m := canInline.FindStringSubmatch(line); m != nil { |
| fname := m[1] |
| fullname := curPkg + "." + fname |
| // If function must be inlined somewhere, being inlinable is not enough |
| if _, ok := must[fullname]; !ok { |
| delete(notInlinedReason, fullname) |
| continue |
| } |
| } |
| if m := cannotInline.FindStringSubmatch(line); m != nil { |
| fname, reason := m[1], m[2] |
| fullName := curPkg + "." + fname |
| if _, ok := notInlinedReason[fullName]; ok { |
| // cmd/compile gave us a reason why |
| notInlinedReason[fullName] = reason |
| } |
| continue |
| } |
| } |
| if err := <-cmdErr; err != nil { |
| t.Fatal(err) |
| } |
| if err := scanner.Err(); err != nil { |
| t.Fatal(err) |
| } |
| for fullName, reason := range notInlinedReason { |
| t.Errorf("%s was not inlined: %s", fullName, reason) |
| } |
| } |
