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gcov_coverage.go
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gcov_coverage.go
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// Code for parsing gcov coverage output.
package test
import (
"bytes"
"fmt"
"strconv"
"strings"
"core"
)
func parseGcovCoverageResults(target *core.BuildTarget, coverage *core.TestCoverage, data []byte) error {
// The data we have is a sequence of .gcov files smashed together.
lines := bytes.Split(data, []byte{'\n'})
if len(lines) == 0 {
return fmt.Errorf("Empty coverage file")
}
currentFilename := ""
for lineno, line := range lines {
fields := bytes.Split(line, []byte{':'})
if len(fields) < 3 {
continue
}
if bytes.Equal(fields[2], []byte("Source")) {
if len(fields) < 4 {
return fmt.Errorf("Bad source on line %d: %s", lineno, string(line))
}
currentFilename = string(fields[3])
continue
}
covLine, err := strconv.Atoi(strings.TrimSpace(string(fields[1])))
if err != nil {
return fmt.Errorf("Bad line number on line %d: %s", lineno, string(line))
} else if covLine > 0 {
coverage.Files[currentFilename] = append(coverage.Files[currentFilename], translateGcovCount(bytes.TrimSpace(fields[0])))
}
}
return nil
}
// translateGcovCount coverts gcov's format to ours.
// AFAICT the format is:
// -: Not executable
// #####: Not covered
// 32: line was hit 32 times
func translateGcovCount(gcov []byte) core.LineCoverage {
if len(gcov) > 0 && gcov[0] == '-' {
return core.NotExecutable
} else if i, err := strconv.Atoi(string(gcov)); err == nil && i > 0 {
return core.Covered
}
return core.Uncovered
}
// looksLikeGcovCoverageResults returns true if the given data appears to be gcov results.
func looksLikeGcovCoverageResults(data []byte) bool {
return bytes.HasPrefix(data, []byte(" -: 0:Source:"))
}