Initial commit: Go 1.23 release state
This commit is contained in:
Vorapol Rinsatitnon
603
src/internal/coverage/cfile/emit.go
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603
src/internal/coverage/cfile/emit.go
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@@ -0,0 +1,603 @@
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// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package cfile implements management of coverage files.
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// It provides functionality exported in runtime/coverage as well as
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// additional functionality used directly by package testing
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// through testing/internal/testdeps.
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package cfile
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import (
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"crypto/md5"
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"fmt"
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"internal/coverage"
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"internal/coverage/encodecounter"
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"internal/coverage/encodemeta"
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"internal/coverage/rtcov"
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"io"
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"os"
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"path/filepath"
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"runtime"
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"strconv"
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"sync/atomic"
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"time"
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"unsafe"
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)
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// This file contains functions that support the writing of data files
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// emitted at the end of code coverage testing runs, from instrumented
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// executables.
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// getCovCounterList returns a list of counter-data blobs registered
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// for the currently executing instrumented program. It is defined in the
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// runtime.
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//
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//go:linkname getCovCounterList
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func getCovCounterList() []rtcov.CovCounterBlob
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// emitState holds useful state information during the emit process.
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//
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// When an instrumented program finishes execution and starts the
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// process of writing out coverage data, it's possible that an
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// existing meta-data file already exists in the output directory. In
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// this case openOutputFiles() below will leave the 'mf' field below
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// as nil. If a new meta-data file is needed, field 'mfname' will be
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// the final desired path of the meta file, 'mftmp' will be a
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// temporary file, and 'mf' will be an open os.File pointer for
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// 'mftmp'. The meta-data file payload will be written to 'mf', the
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// temp file will be then closed and renamed (from 'mftmp' to
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// 'mfname'), so as to insure that the meta-data file is created
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// atomically; we want this so that things work smoothly in cases
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// where there are several instances of a given instrumented program
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// all terminating at the same time and trying to create meta-data
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// files simultaneously.
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//
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// For counter data files there is less chance of a collision, hence
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// the openOutputFiles() stores the counter data file in 'cfname' and
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// then places the *io.File into 'cf'.
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type emitState struct {
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mfname string // path of final meta-data output file
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mftmp string // path to meta-data temp file (if needed)
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mf *os.File // open os.File for meta-data temp file
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cfname string // path of final counter data file
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cftmp string // path to counter data temp file
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cf *os.File // open os.File for counter data file
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outdir string // output directory
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// List of meta-data symbols obtained from the runtime
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metalist []rtcov.CovMetaBlob
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// List of counter-data symbols obtained from the runtime
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counterlist []rtcov.CovCounterBlob
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// Table to use for remapping hard-coded pkg ids.
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pkgmap map[int]int
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// emit debug trace output
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debug bool
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}
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var (
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// finalHash is computed at init time from the list of meta-data
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// symbols registered during init. It is used both for writing the
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// meta-data file and counter-data files.
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finalHash [16]byte
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// Set to true when we've computed finalHash + finalMetaLen.
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finalHashComputed bool
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// Total meta-data length.
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finalMetaLen uint64
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// Records whether we've already attempted to write meta-data.
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metaDataEmitAttempted bool
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// Counter mode for this instrumented program run.
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cmode coverage.CounterMode
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// Counter granularity for this instrumented program run.
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cgran coverage.CounterGranularity
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// Cached value of GOCOVERDIR environment variable.
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goCoverDir string
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// Copy of os.Args made at init time, converted into map format.
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capturedOsArgs map[string]string
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// Flag used in tests to signal that coverage data already written.
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covProfileAlreadyEmitted bool
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)
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// fileType is used to select between counter-data files and
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// meta-data files.
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type fileType int
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const (
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noFile = 1 << iota
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metaDataFile
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counterDataFile
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)
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// emitMetaData emits the meta-data output file for this coverage run.
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// This entry point is intended to be invoked by the compiler from
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// an instrumented program's main package init func.
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func emitMetaData() {
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if covProfileAlreadyEmitted {
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return
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}
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ml, err := prepareForMetaEmit()
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if err != nil {
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fmt.Fprintf(os.Stderr, "error: coverage meta-data prep failed: %v\n", err)
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if os.Getenv("GOCOVERDEBUG") != "" {
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panic("meta-data write failure")
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}
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}
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if len(ml) == 0 {
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fmt.Fprintf(os.Stderr, "program not built with -cover\n")
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return
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}
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goCoverDir = os.Getenv("GOCOVERDIR")
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if goCoverDir == "" {
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fmt.Fprintf(os.Stderr, "warning: GOCOVERDIR not set, no coverage data emitted\n")
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return
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}
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if err := emitMetaDataToDirectory(goCoverDir, ml); err != nil {
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fmt.Fprintf(os.Stderr, "error: coverage meta-data emit failed: %v\n", err)
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if os.Getenv("GOCOVERDEBUG") != "" {
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panic("meta-data write failure")
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}
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}
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}
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func modeClash(m coverage.CounterMode) bool {
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if m == coverage.CtrModeRegOnly || m == coverage.CtrModeTestMain {
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return false
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}
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if cmode == coverage.CtrModeInvalid {
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cmode = m
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return false
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}
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return cmode != m
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}
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func granClash(g coverage.CounterGranularity) bool {
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if cgran == coverage.CtrGranularityInvalid {
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cgran = g
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return false
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}
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return cgran != g
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}
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// prepareForMetaEmit performs preparatory steps needed prior to
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// emitting a meta-data file, notably computing a final hash of
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// all meta-data blobs and capturing os args.
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func prepareForMetaEmit() ([]rtcov.CovMetaBlob, error) {
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// Ask the runtime for the list of coverage meta-data symbols.
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ml := rtcov.Meta.List
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// In the normal case (go build -o prog.exe ... ; ./prog.exe)
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// len(ml) will always be non-zero, but we check here since at
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// some point this function will be reachable via user-callable
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// APIs (for example, to write out coverage data from a server
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// program that doesn't ever call os.Exit).
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if len(ml) == 0 {
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return nil, nil
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}
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s := &emitState{
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metalist: ml,
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debug: os.Getenv("GOCOVERDEBUG") != "",
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}
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// Capture os.Args() now so as to avoid issues if args
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// are rewritten during program execution.
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capturedOsArgs = captureOsArgs()
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if s.debug {
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fmt.Fprintf(os.Stderr, "=+= GOCOVERDIR is %s\n", os.Getenv("GOCOVERDIR"))
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fmt.Fprintf(os.Stderr, "=+= contents of covmetalist:\n")
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for k, b := range ml {
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fmt.Fprintf(os.Stderr, "=+= slot: %d path: %s ", k, b.PkgPath)
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if b.PkgID != -1 {
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fmt.Fprintf(os.Stderr, " hcid: %d", b.PkgID)
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}
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fmt.Fprintf(os.Stderr, "\n")
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}
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pm := rtcov.Meta.PkgMap
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fmt.Fprintf(os.Stderr, "=+= remap table:\n")
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for from, to := range pm {
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fmt.Fprintf(os.Stderr, "=+= from %d to %d\n",
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uint32(from), uint32(to))
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}
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}
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h := md5.New()
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tlen := uint64(unsafe.Sizeof(coverage.MetaFileHeader{}))
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for _, entry := range ml {
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if _, err := h.Write(entry.Hash[:]); err != nil {
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return nil, err
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}
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tlen += uint64(entry.Len)
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ecm := coverage.CounterMode(entry.CounterMode)
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if modeClash(ecm) {
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return nil, fmt.Errorf("coverage counter mode clash: package %s uses mode=%d, but package %s uses mode=%s\n", ml[0].PkgPath, cmode, entry.PkgPath, ecm)
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}
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ecg := coverage.CounterGranularity(entry.CounterGranularity)
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if granClash(ecg) {
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return nil, fmt.Errorf("coverage counter granularity clash: package %s uses gran=%d, but package %s uses gran=%s\n", ml[0].PkgPath, cgran, entry.PkgPath, ecg)
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}
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}
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// Hash mode and granularity as well.
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h.Write([]byte(cmode.String()))
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h.Write([]byte(cgran.String()))
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// Compute final digest.
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fh := h.Sum(nil)
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copy(finalHash[:], fh)
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finalHashComputed = true
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finalMetaLen = tlen
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return ml, nil
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}
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// emitMetaDataToDirectory emits the meta-data output file to the specified
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// directory, returning an error if something went wrong.
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func emitMetaDataToDirectory(outdir string, ml []rtcov.CovMetaBlob) error {
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ml, err := prepareForMetaEmit()
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if err != nil {
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return err
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}
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if len(ml) == 0 {
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return nil
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}
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metaDataEmitAttempted = true
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s := &emitState{
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metalist: ml,
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debug: os.Getenv("GOCOVERDEBUG") != "",
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outdir: outdir,
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}
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// Open output files.
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if err := s.openOutputFiles(finalHash, finalMetaLen, metaDataFile); err != nil {
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return err
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}
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// Emit meta-data file only if needed (may already be present).
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if s.needMetaDataFile() {
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if err := s.emitMetaDataFile(finalHash, finalMetaLen); err != nil {
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return err
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}
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}
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return nil
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}
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// emitCounterData emits the counter data output file for this coverage run.
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// This entry point is intended to be invoked by the runtime when an
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// instrumented program is terminating or calling os.Exit().
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func emitCounterData() {
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if goCoverDir == "" || !finalHashComputed || covProfileAlreadyEmitted {
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return
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}
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if err := emitCounterDataToDirectory(goCoverDir); err != nil {
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fmt.Fprintf(os.Stderr, "error: coverage counter data emit failed: %v\n", err)
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if os.Getenv("GOCOVERDEBUG") != "" {
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panic("counter-data write failure")
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}
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}
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}
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// emitCounterDataToDirectory emits the counter-data output file for this coverage run.
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func emitCounterDataToDirectory(outdir string) error {
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// Ask the runtime for the list of coverage counter symbols.
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cl := getCovCounterList()
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if len(cl) == 0 {
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// no work to do here.
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return nil
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}
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if !finalHashComputed {
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return fmt.Errorf("error: meta-data not available (binary not built with -cover?)")
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}
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// Ask the runtime for the list of coverage counter symbols.
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pm := rtcov.Meta.PkgMap
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s := &emitState{
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counterlist: cl,
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pkgmap: pm,
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outdir: outdir,
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debug: os.Getenv("GOCOVERDEBUG") != "",
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}
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// Open output file.
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if err := s.openOutputFiles(finalHash, finalMetaLen, counterDataFile); err != nil {
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return err
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}
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if s.cf == nil {
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return fmt.Errorf("counter data output file open failed (no additional info")
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}
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// Emit counter data file.
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if err := s.emitCounterDataFile(finalHash, s.cf); err != nil {
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return err
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}
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if err := s.cf.Close(); err != nil {
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return fmt.Errorf("closing counter data file: %v", err)
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}
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// Counter file has now been closed. Rename the temp to the
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// final desired path.
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if err := os.Rename(s.cftmp, s.cfname); err != nil {
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return fmt.Errorf("writing %s: rename from %s failed: %v\n", s.cfname, s.cftmp, err)
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}
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return nil
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}
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// emitCounterDataToWriter emits counter data for this coverage run to an io.Writer.
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func (s *emitState) emitCounterDataToWriter(w io.Writer) error {
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if err := s.emitCounterDataFile(finalHash, w); err != nil {
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return err
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}
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return nil
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}
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// openMetaFile determines whether we need to emit a meta-data output
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// file, or whether we can reuse the existing file in the coverage out
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// dir. It updates mfname/mftmp/mf fields in 's', returning an error
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// if something went wrong. See the comment on the emitState type
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// definition above for more on how file opening is managed.
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func (s *emitState) openMetaFile(metaHash [16]byte, metaLen uint64) error {
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// Open meta-outfile for reading to see if it exists.
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fn := fmt.Sprintf("%s.%x", coverage.MetaFilePref, metaHash)
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s.mfname = filepath.Join(s.outdir, fn)
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fi, err := os.Stat(s.mfname)
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if err != nil || fi.Size() != int64(metaLen) {
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// We need a new meta-file.
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tname := "tmp." + fn + strconv.FormatInt(time.Now().UnixNano(), 10)
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s.mftmp = filepath.Join(s.outdir, tname)
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s.mf, err = os.Create(s.mftmp)
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if err != nil {
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return fmt.Errorf("creating meta-data file %s: %v", s.mftmp, err)
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}
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}
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return nil
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}
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// openCounterFile opens an output file for the counter data portion
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// of a test coverage run. If updates the 'cfname' and 'cf' fields in
|
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// 's', returning an error if something went wrong.
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func (s *emitState) openCounterFile(metaHash [16]byte) error {
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processID := os.Getpid()
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fn := fmt.Sprintf(coverage.CounterFileTempl, coverage.CounterFilePref, metaHash, processID, time.Now().UnixNano())
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s.cfname = filepath.Join(s.outdir, fn)
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s.cftmp = filepath.Join(s.outdir, "tmp."+fn)
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var err error
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s.cf, err = os.Create(s.cftmp)
|
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if err != nil {
|
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return fmt.Errorf("creating counter data file %s: %v", s.cftmp, err)
|
||||
}
|
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return nil
|
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}
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// openOutputFiles opens output files in preparation for emitting
|
||||
// coverage data. In the case of the meta-data file, openOutputFiles
|
||||
// may determine that we can reuse an existing meta-data file in the
|
||||
// outdir, in which case it will leave the 'mf' field in the state
|
||||
// struct as nil. If a new meta-file is needed, the field 'mfname'
|
||||
// will be the final desired path of the meta file, 'mftmp' will be a
|
||||
// temporary file, and 'mf' will be an open os.File pointer for
|
||||
// 'mftmp'. The idea is that the client/caller will write content into
|
||||
// 'mf', close it, and then rename 'mftmp' to 'mfname'. This function
|
||||
// also opens the counter data output file, setting 'cf' and 'cfname'
|
||||
// in the state struct.
|
||||
func (s *emitState) openOutputFiles(metaHash [16]byte, metaLen uint64, which fileType) error {
|
||||
fi, err := os.Stat(s.outdir)
|
||||
if err != nil {
|
||||
return fmt.Errorf("output directory %q inaccessible (err: %v); no coverage data written", s.outdir, err)
|
||||
}
|
||||
if !fi.IsDir() {
|
||||
return fmt.Errorf("output directory %q not a directory; no coverage data written", s.outdir)
|
||||
}
|
||||
|
||||
if (which & metaDataFile) != 0 {
|
||||
if err := s.openMetaFile(metaHash, metaLen); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
if (which & counterDataFile) != 0 {
|
||||
if err := s.openCounterFile(metaHash); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// emitMetaDataFile emits coverage meta-data to a previously opened
|
||||
// temporary file (s.mftmp), then renames the generated file to the
|
||||
// final path (s.mfname).
|
||||
func (s *emitState) emitMetaDataFile(finalHash [16]byte, tlen uint64) error {
|
||||
if err := writeMetaData(s.mf, s.metalist, cmode, cgran, finalHash); err != nil {
|
||||
return fmt.Errorf("writing %s: %v\n", s.mftmp, err)
|
||||
}
|
||||
if err := s.mf.Close(); err != nil {
|
||||
return fmt.Errorf("closing meta data temp file: %v", err)
|
||||
}
|
||||
|
||||
// Temp file has now been flushed and closed. Rename the temp to the
|
||||
// final desired path.
|
||||
if err := os.Rename(s.mftmp, s.mfname); err != nil {
|
||||
return fmt.Errorf("writing %s: rename from %s failed: %v\n", s.mfname, s.mftmp, err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// needMetaDataFile returns TRUE if we need to emit a meta-data file
|
||||
// for this program run. It should be used only after
|
||||
// openOutputFiles() has been invoked.
|
||||
func (s *emitState) needMetaDataFile() bool {
|
||||
return s.mf != nil
|
||||
}
|
||||
|
||||
func writeMetaData(w io.Writer, metalist []rtcov.CovMetaBlob, cmode coverage.CounterMode, gran coverage.CounterGranularity, finalHash [16]byte) error {
|
||||
mfw := encodemeta.NewCoverageMetaFileWriter("<io.Writer>", w)
|
||||
|
||||
var blobs [][]byte
|
||||
for _, e := range metalist {
|
||||
sd := unsafe.Slice(e.P, int(e.Len))
|
||||
blobs = append(blobs, sd)
|
||||
}
|
||||
return mfw.Write(finalHash, blobs, cmode, gran)
|
||||
}
|
||||
|
||||
func (s *emitState) VisitFuncs(f encodecounter.CounterVisitorFn) error {
|
||||
var tcounters []uint32
|
||||
|
||||
rdCounters := func(actrs []atomic.Uint32, ctrs []uint32) []uint32 {
|
||||
ctrs = ctrs[:0]
|
||||
for i := range actrs {
|
||||
ctrs = append(ctrs, actrs[i].Load())
|
||||
}
|
||||
return ctrs
|
||||
}
|
||||
|
||||
dpkg := uint32(0)
|
||||
for _, c := range s.counterlist {
|
||||
sd := unsafe.Slice((*atomic.Uint32)(unsafe.Pointer(c.Counters)), int(c.Len))
|
||||
for i := 0; i < len(sd); i++ {
|
||||
// Skip ahead until the next non-zero value.
|
||||
sdi := sd[i].Load()
|
||||
if sdi == 0 {
|
||||
continue
|
||||
}
|
||||
|
||||
// We found a function that was executed.
|
||||
nCtrs := sd[i+coverage.NumCtrsOffset].Load()
|
||||
pkgId := sd[i+coverage.PkgIdOffset].Load()
|
||||
funcId := sd[i+coverage.FuncIdOffset].Load()
|
||||
cst := i + coverage.FirstCtrOffset
|
||||
counters := sd[cst : cst+int(nCtrs)]
|
||||
|
||||
// Check to make sure that we have at least one live
|
||||
// counter. See the implementation note in ClearCoverageCounters
|
||||
// for a description of why this is needed.
|
||||
isLive := false
|
||||
for i := 0; i < len(counters); i++ {
|
||||
if counters[i].Load() != 0 {
|
||||
isLive = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if !isLive {
|
||||
// Skip this function.
|
||||
i += coverage.FirstCtrOffset + int(nCtrs) - 1
|
||||
continue
|
||||
}
|
||||
|
||||
if s.debug {
|
||||
if pkgId != dpkg {
|
||||
dpkg = pkgId
|
||||
fmt.Fprintf(os.Stderr, "\n=+= %d: pk=%d visit live fcn",
|
||||
i, pkgId)
|
||||
}
|
||||
fmt.Fprintf(os.Stderr, " {i=%d F%d NC%d}", i, funcId, nCtrs)
|
||||
}
|
||||
|
||||
// Vet and/or fix up package ID. A package ID of zero
|
||||
// indicates that there is some new package X that is a
|
||||
// runtime dependency, and this package has code that
|
||||
// executes before its corresponding init package runs.
|
||||
// This is a fatal error that we should only see during
|
||||
// Go development (e.g. tip).
|
||||
ipk := int32(pkgId)
|
||||
if ipk == 0 {
|
||||
fmt.Fprintf(os.Stderr, "\n")
|
||||
reportErrorInHardcodedList(int32(i), ipk, funcId, nCtrs)
|
||||
} else if ipk < 0 {
|
||||
if newId, ok := s.pkgmap[int(ipk)]; ok {
|
||||
pkgId = uint32(newId)
|
||||
} else {
|
||||
fmt.Fprintf(os.Stderr, "\n")
|
||||
reportErrorInHardcodedList(int32(i), ipk, funcId, nCtrs)
|
||||
}
|
||||
} else {
|
||||
// The package ID value stored in the counter array
|
||||
// has 1 added to it (so as to preclude the
|
||||
// possibility of a zero value ; see
|
||||
// runtime.addCovMeta), so subtract off 1 here to form
|
||||
// the real package ID.
|
||||
pkgId--
|
||||
}
|
||||
|
||||
tcounters = rdCounters(counters, tcounters)
|
||||
if err := f(pkgId, funcId, tcounters); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Skip over this function.
|
||||
i += coverage.FirstCtrOffset + int(nCtrs) - 1
|
||||
}
|
||||
if s.debug {
|
||||
fmt.Fprintf(os.Stderr, "\n")
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// captureOsArgs converts os.Args() into the format we use to store
|
||||
// this info in the counter data file (counter data file "args"
|
||||
// section is a generic key-value collection). See the 'args' section
|
||||
// in internal/coverage/defs.go for more info. The args map
|
||||
// is also used to capture GOOS + GOARCH values as well.
|
||||
func captureOsArgs() map[string]string {
|
||||
m := make(map[string]string)
|
||||
m["argc"] = strconv.Itoa(len(os.Args))
|
||||
for k, a := range os.Args {
|
||||
m[fmt.Sprintf("argv%d", k)] = a
|
||||
}
|
||||
m["GOOS"] = runtime.GOOS
|
||||
m["GOARCH"] = runtime.GOARCH
|
||||
return m
|
||||
}
|
||||
|
||||
// emitCounterDataFile emits the counter data portion of a
|
||||
// coverage output file (to the file 's.cf').
|
||||
func (s *emitState) emitCounterDataFile(finalHash [16]byte, w io.Writer) error {
|
||||
cfw := encodecounter.NewCoverageDataWriter(w, coverage.CtrULeb128)
|
||||
if err := cfw.Write(finalHash, capturedOsArgs, s); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// MarkProfileEmitted signals the coverage machinery that
|
||||
// coverage data output files have already been written out, and there
|
||||
// is no need to take any additional action at exit time. This
|
||||
// function is called from the coverage-related boilerplate code in _testmain.go
|
||||
// emitted for go unit tests.
|
||||
func MarkProfileEmitted(val bool) {
|
||||
covProfileAlreadyEmitted = val
|
||||
}
|
||||
|
||||
func reportErrorInHardcodedList(slot, pkgID int32, fnID, nCtrs uint32) {
|
||||
metaList := rtcov.Meta.List
|
||||
pkgMap := rtcov.Meta.PkgMap
|
||||
|
||||
println("internal error in coverage meta-data tracking:")
|
||||
println("encountered bad pkgID:", pkgID, " at slot:", slot,
|
||||
" fnID:", fnID, " numCtrs:", nCtrs)
|
||||
println("list of hard-coded runtime package IDs needs revising.")
|
||||
println("[see the comment on the 'rtPkgs' var in ")
|
||||
println(" <goroot>/src/internal/coverage/pkid.go]")
|
||||
println("registered list:")
|
||||
for k, b := range metaList {
|
||||
print("slot: ", k, " path='", b.PkgPath, "' ")
|
||||
if b.PkgID != -1 {
|
||||
print(" hard-coded id: ", b.PkgID)
|
||||
}
|
||||
println("")
|
||||
}
|
||||
println("remap table:")
|
||||
for from, to := range pkgMap {
|
||||
println("from ", from, " to ", to)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user