go main 源码
golang main 代码
文件路径：/src/cmd/cover/testdata/main.go
// Copyright 2013 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.
// Test runner for coverage test. This file is not coverage-annotated; test.go is.
// It knows the coverage counter is called
// "thisNameMustBeVeryLongToCauseOverflowOfCounterIncrementStatementOntoNextLineForTest".
package main
import (
"fmt"
"os"
)
func main() {
testAll()
verify()
}
type block struct {
count uint32
line uint32
}
var counters = make(map[block]bool)
// shorthand for the long counter variable.
var coverTest = &thisNameMustBeVeryLongToCauseOverflowOfCounterIncrementStatementOntoNextLineForTest
// check records the location and expected value for a counter.
func check(line, count uint32) {
b := block{
count,
line,
}
counters[b] = true
}
// checkVal is a version of check that returns its extra argument,
// so it can be used in conditionals.
func checkVal(line, count uint32, val int) int {
b := block{
count,
line,
}
counters[b] = true
return val
}
var PASS = true
// verify checks the expected counts against the actual. It runs after the test has completed.
func verify() {
for b := range counters {
got, index := count(b.line)
if b.count == anything && got != 0 {
got = anything
}
if got != b.count {
fmt.Fprintf(os.Stderr, "test_go:%d expected count %d got %d [counter %d]\n", b.line, b.count, got, index)
PASS = false
}
}
verifyPanic()
if !PASS {
fmt.Fprintf(os.Stderr, "FAIL\n")
os.Exit(2)
}
}
// verifyPanic is a special check for the known counter that should be
// after the panic call in testPanic.
func verifyPanic() {
if coverTest.Count[panicIndex-1] != 1 {
// Sanity check for test before panic.
fmt.Fprintf(os.Stderr, "bad before panic")
PASS = false
}
if coverTest.Count[panicIndex] != 0 {
fmt.Fprintf(os.Stderr, "bad at panic: %d should be 0\n", coverTest.Count[panicIndex])
PASS = false
}
if coverTest.Count[panicIndex+1] != 1 {
fmt.Fprintf(os.Stderr, "bad after panic")
PASS = false
}
}
// count returns the count and index for the counter at the specified line.
func count(line uint32) (uint32, int) {
// Linear search is fine. Choose perfect fit over approximate.
// We can have a closing brace for a range on the same line as a condition for an "else if"
// and we don't want that brace to steal the count for the condition on the "if".
// Therefore we test for a perfect (lo==line && hi==line) match, but if we can't
// find that we take the first imperfect match.
index := -1
indexLo := uint32(1e9)
for i := range coverTest.Count {
lo, hi := coverTest.Pos[3*i], coverTest.Pos[3*i+1]
if lo == line && line == hi {
return coverTest.Count[i], i
}
// Choose the earliest match (the counters are in unpredictable order).
if lo <= line && line <= hi && indexLo > lo {
index = i
indexLo = lo
}
}
if index == -1 {
fmt.Fprintln(os.Stderr, "cover_test: no counter for line", line)
PASS = false
return 0, 0
}
return coverTest.Count[index], index
}
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