go hist 源码
golang hist 代码
文件路径：/src/cmd/compile/internal/ssa/testdata/hist.go
// Copyright 2017 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.
// This is the input program for an end-to-end test of the DWARF produced
// by the compiler. It is compiled with various flags, then the resulting
// binary is "debugged" under the control of a harness. Because the compile+debug
// step is time-consuming, the tests for different bugs are all accumulated here
// so that their cost is only the time to "n" through the additional code.
package main
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
)
type point struct {
x, y int
}
type line struct {
begin, end point
}
var zero int
var sink int
//go:noinline
func tinycall() {
}
func ensure(n int, sl []int) []int {
for len(sl) <= n {
sl = append(sl, 0)
}
return sl
}
var cannedInput string = `1
1
1
2
2
2
4
4
5
`
func test() {
// For #19868
l := line{point{1 + zero, 2 + zero}, point{3 + zero, 4 + zero}}
tinycall() // this forces l etc to stack
dx := l.end.x - l.begin.x //gdb-dbg=(l.begin.x,l.end.y)//gdb-opt=(l,dx/O,dy/O)
dy := l.end.y - l.begin.y //gdb-opt=(dx,dy/O)
sink = dx + dy //gdb-opt=(dx,dy)
// For #21098
hist := make([]int, 7) //gdb-opt=(dx/O,dy/O) // TODO sink is missing if this code is in 'test' instead of 'main'
var reader io.Reader = strings.NewReader(cannedInput) //gdb-dbg=(hist/A) // TODO cannedInput/A is missing if this code is in 'test' instead of 'main'
if len(os.Args) > 1 {
var err error
reader, err = os.Open(os.Args[1])
if err != nil {
fmt.Fprintf(os.Stderr, "There was an error opening %s: %v\n", os.Args[1], err)
return
}
}
scanner := bufio.NewScanner(reader)
for scanner.Scan() { //gdb-opt=(scanner/A)
s := scanner.Text()
i, err := strconv.ParseInt(s, 10, 64)
if err != nil { //gdb-dbg=(i) //gdb-opt=(err,hist,i)
fmt.Fprintf(os.Stderr, "There was an error: %v\n", err)
return
}
hist = ensure(int(i), hist)
hist[int(i)]++
}
t := 0
n := 0
for i, a := range hist {
if a == 0 { //gdb-opt=(a,n,t)
continue
}
t += i * a
n += a
fmt.Fprintf(os.Stderr, "%d\t%d\t%d\t%d\t%d\n", i, a, n, i*a, t) //gdb-dbg=(n,i,t)
}
}
func main() {
growstack() // Use stack early to prevent growth during test, which confuses gdb
test()
}
var snk string
//go:noinline
func growstack() {
snk = fmt.Sprintf("%#v,%#v,%#v", 1, true, "cat")
}
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