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.
const CounterFilePref = "covcounters"
const CounterFileRegexp = `^%s\.(\S+)\.(\d+)\.(\d+)+$`
const CounterFileTempl = "%s.%x.%d.%d"
CounterFileVersion stores the most recent counter data file version.
const CounterFileVersion = 1
const CovMetaHeaderSize = 16 + 4 + 4 + 4 + 4 + 4 + 4 + 4 // keep in sync with above
const FirstCtrOffset = 3
const FuncIdOffset = 2
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.
const MetaFilePref = "covmeta"
MetaFileVersion contains the current (most recent) meta-data file version.
const MetaFileVersion = 1
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.
const MetaFilesFileName = "metafiles.txt"
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.
const NotHardCoded = -1
const NumCtrsOffset = 0
const PkgIdOffset = 1
CovCounterMagic holds the magic string for a coverage counter-data file.
var CovCounterMagic = [4]byte{'\x00', '\x63', '\x77', '\x6d'}
CovMetaMagic holds the magic string for a meta-data file.
var CovMetaMagic = [4]byte{'\x00', '\x63', '\x76', '\x6d'}
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(x int) int
CounterFileFooter appears at the tail end of a counter data file, and stores the number of segments it contains.
type CounterFileFooter struct {
Magic [4]byte
NumSegments uint32
// contains filtered or unexported fields
}
CounterFileHeader stores files header information for a counter-data file.
type CounterFileHeader struct {
Magic [4]byte
Version uint32
MetaHash [16]byte
CFlavor CounterFlavor
BigEndian bool
// contains filtered or unexported fields
}
CounterFlavor describes how function and counters are stored/represented in the counter section of the file.
type CounterFlavor uint8
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.
CtrULeb128
)
CounterGranularity tracks the granularity of the coverage counters being used in a given coverage-instrumented program.
type CounterGranularity uint8
const (
CtrGranularityInvalid CounterGranularity = iota
CtrGranularityPerBlock
CtrGranularityPerFunc
)
func (cm CounterGranularity) String() string
CounterMode tracks the "flavor" of the coverage counters being used in a given coverage-instrumented program.
type CounterMode uint8
const (
CtrModeInvalid CounterMode = iota
CtrModeSet // "set" mode
CtrModeCount // "count" mode
CtrModeAtomic // "atomic" mode
CtrModeRegOnly // registration-only pseudo-mode
CtrModeTestMain // testmain pseudo-mode
)
func ParseCounterMode(mode string) CounterMode
func (cm CounterMode) String() string
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 CounterSegmentHeader struct {
FcnEntries uint64
StrTabLen uint32
ArgsLen 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 CoverableUnit struct {
StLine, StCol uint32
EnLine, EnCol uint32
NxStmts uint32
Parent uint32
}
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 FuncDesc struct {
Funcname string
Srcfile string
Units []CoverableUnit
Lit bool // true if this is a function literal
}
MetaFileCollection contains information generated by the Go command and the read in by coverage test support functions within an executing "go test -cover" binary.
type MetaFileCollection struct {
ImportPaths []string
MetaFileFragments []string
}
MetaFileHeader stores file header information for a meta-data file.
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
}
MetaSymbolHeader stores header information for a single meta-data blob, e.g. the coverage meta-data payload computed for a given Go package.
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
}
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|---|---|
| .. | |