package standard library
go1.22.5 Latest Latest

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Published: Jul 2, 2024 License: BSD-3-Clause Imports: 0 Imported by: 0




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const CounterFilePref = "covcounters"

CounterFilePref is the file prefix used when emitting coverage data output files. CounterFileTemplate describes the format of the file name: prefix followed by meta-file hash followed by process ID followed by emit UnixNanoTime.

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const CounterFileRegexp = `^%s\.(\S+)\.(\d+)\.(\d+)+$`
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const CounterFileTempl = "%s.%x.%d.%d"
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const CounterFileVersion = 1

CounterFileVersion stores the most recent counter data file version.

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const CovMetaHeaderSize = 16 + 4 + 4 + 4 + 4 + 4 + 4 + 4 // keep in sync with above
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const FirstCtrOffset = 3
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const FuncIdOffset = 2
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const MetaFilePref = "covmeta"

MetaFilePref is a prefix used when emitting meta-data files; these files are of the form "covmeta.<hash>", where hash is a hash computed from the hashes of all the package meta-data symbols in the program.

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const MetaFileVersion = 1

MetaFileVersion contains the current (most recent) meta-data file version.

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const MetaFilesFileName = "metafiles.txt"

Name of file within the "go test -cover" temp coverdir directory containing a list of meta-data files for packages being tested in a "go test -coverpkg=... ..." run. This constant is shared by the Go command and by the coverage runtime.

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const NotHardCoded = -1

NotHardCoded is a package pseudo-ID indicating that a given package is not part of the runtime and doesn't require a hard-coded ID.

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const NumCtrsOffset = 0
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const PkgIdOffset = 1


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var CovCounterMagic = [4]byte{'\x00', '\x63', '\x77', '\x6d'}

CovCounterMagic holds the magic string for a coverage counter-data file.

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var CovMetaMagic = [4]byte{'\x00', '\x63', '\x76', '\x6d'}

CovMetaMagic holds the magic string for a meta-data file.


func HardCodedPkgID

func HardCodedPkgID(pkgpath string) int

HardCodedPkgID returns the hard-coded ID for the specified package path, or -1 if we don't use a hard-coded ID. Hard-coded IDs start at -2 and decrease as we go down the list.

func Round4

func Round4(x int) int


type CounterFileFooter

type CounterFileFooter struct {
	Magic [4]byte

	NumSegments uint32
	// contains filtered or unexported fields

CounterFileFooter appears at the tail end of a counter data file, and stores the number of segments it contains.

type CounterFileHeader

type CounterFileHeader struct {
	Magic     [4]byte
	Version   uint32
	MetaHash  [16]byte
	CFlavor   CounterFlavor
	BigEndian bool
	// contains filtered or unexported fields

CounterFileHeader stores files header information for a counter-data file.

type CounterFlavor

type CounterFlavor uint8

CounterFlavor describes how function and counters are stored/represented in the counter section of the file.

const (
	// "Raw" representation: all values (pkg ID, func ID, num counters,
	// and counters themselves) are stored as uint32's.
	CtrRaw CounterFlavor = iota + 1

	// "ULeb" representation: all values (pkg ID, func ID, num counters,
	// and counters themselves) are stored with ULEB128 encoding.

type CounterGranularity

type CounterGranularity uint8

CounterGranularity tracks the granularity of the coverage counters being used in a given coverage-instrumented program.

const (
	CtrGranularityInvalid CounterGranularity = iota

func (CounterGranularity) String

func (cm CounterGranularity) String() string

type CounterMode

type CounterMode uint8

CounterMode tracks the "flavor" of the coverage counters being used in a given coverage-instrumented program.

const (
	CtrModeInvalid  CounterMode = iota
	CtrModeSet                  // "set" mode
	CtrModeCount                // "count" mode
	CtrModeAtomic               // "atomic" mode
	CtrModeRegOnly              // registration-only pseudo-mode
	CtrModeTestMain             // testmain pseudo-mode

func ParseCounterMode

func ParseCounterMode(mode string) CounterMode

func (CounterMode) String

func (cm CounterMode) String() string

type CounterSegmentHeader

type CounterSegmentHeader struct {
	FcnEntries uint64
	StrTabLen  uint32
	ArgsLen    uint32

CounterSegmentHeader encapsulates information about a specific segment in a counter data file, which at the moment contains counters data from a single execution of a coverage-instrumented program. Following the segment header will be the string table and args table, and then (possibly) padding bytes to bring the byte size of the preamble up to a multiple of 4. Immediately following that will be the counter payloads.

The "args" section of a segment is used to store annotations describing where the counter data came from; this section is basically a series of key-value pairs (can be thought of as an encoded 'map[string]string'). At the moment we only write os.Args() data to this section, using pairs of the form "argc=<integer>", "argv0=<os.Args[0]>", "argv1=<os.Args[1]>", and so on. In the future the args table may also include things like GOOS/GOARCH values, and/or tags indicating which tests were run to generate the counter data.

type CoverableUnit

type CoverableUnit struct {
	StLine, StCol uint32
	EnLine, EnCol uint32
	NxStmts       uint32
	Parent        uint32

CoverableUnit describes the source characteristics of a single program unit for which we want to gather coverage info. Coverable units are either "simple" or "intraline"; a "simple" coverable unit corresponds to a basic block (region of straight-line code with no jumps or control transfers). An "intraline" unit corresponds to a logical clause nested within some other simple unit. A simple unit will have a zero Parent value; for an intraline unit NxStmts will be zero and Parent will be set to 1 plus the index of the containing simple statement. Example:

L7:   q := 1
L8:   x := (y == 101 || launch() == false)
L9:   r := x * 2

For the code above we would have three simple units (one for each line), then an intraline unit describing the "launch() == false" clause in line 8, with Parent pointing to the index of the line 8 unit in the units array.

Note: in the initial version of the coverage revamp, only simple units will be in use.

type FuncDesc

type FuncDesc struct {
	Funcname string
	Srcfile  string
	Units    []CoverableUnit
	Lit      bool // true if this is a function literal

FuncDesc encapsulates the meta-data definitions for a single Go function. This version assumes that we're looking at a function before inlining; if we want to capture a post-inlining view of the world, the representations of source positions would need to be a good deal more complicated.

type MetaFileCollection added in go1.21.0

type MetaFileCollection struct {
	ImportPaths       []string
	MetaFileFragments []string

MetaFilePaths contains information generated by the Go command and the read in by coverage test support functions within an executing "go test -cover" binary.

type MetaFileHeader

type MetaFileHeader struct {
	Magic        [4]byte
	Version      uint32
	TotalLength  uint64
	Entries      uint64
	MetaFileHash [16]byte
	StrTabOffset uint32
	StrTabLength uint32
	CMode        CounterMode
	CGranularity CounterGranularity
	// contains filtered or unexported fields

MetaFileHeader stores file header information for a meta-data file.

type MetaSymbolHeader

type MetaSymbolHeader struct {
	Length     uint32 // size of meta-symbol payload in bytes
	PkgName    uint32 // string table index
	PkgPath    uint32 // string table index
	ModulePath uint32 // string table index
	MetaHash   [16]byte

	NumFiles uint32
	NumFuncs uint32
	// contains filtered or unexported fields

MetaSymbolHeader stores header information for a single meta-data blob, e.g. the coverage meta-data payload computed for a given Go package.

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