golang gdb - 打印变量

Question

我有 gdb 无法正确打印变量的问题。简单的程序是通过以下方式构建的：chmurson-osx:helloworld chmurson$ go build -gcflags '-N' start.go 然后 gdb 执行：chmurson-osx:helloworld chmurson$ gdb start -d $GOROOTGNU gdb (GDB) 7.8Copyright (C) 2014 Free Software Foundation, Inc.License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>This is free software: you are free to change and redistribute it.There is NO WARRANTY, to the extent permitted by law.  Type "show copying"and "show warranty" for details.This GDB was configured as "x86_64-apple-darwin14.0.0".Type "show configuration" for configuration details.For bug reporting instructions, please see:<http://www.gnu.org/software/gdb/bugs/>.Find the GDB manual and other documentation resources online at:<http://www.gnu.org/software/gdb/documentation/>.For help, type "help".Type "apropos word" to search for commands related to "word"...Reading symbols from start...done.warning: Missing auto-load scripts referenced in section .debug_gdb_scriptsof file /Users/chmurson/Dev/goprojects/misc/src/helloworld/startUse `info auto-load python-scripts [REGEXP]' to list them.(gdb) (gdb) source /usr/local/go/src/pkg/runtime/runtime-gdb.pyLoading Go Runtime support.这是我接下来要做的：(gdb) list1   package main2   3   import "fmt"4   5   func main() {6       x := "abc"7       i := 38       fmt.Println(i)9       fmt.Println(x)10  }(gdb) b 9Breakpoint 1 at 0x2106: file /Users/chmurson/Dev/goprojects/misc/src/helloworld/start.go, line 9.(gdb) runStarting program: /Users/chmurson/Dev/goprojects/misc/src/helloworld/start 3[New Thread 0x1113 of process 14039]Breakpoint 1, main.main () at /Users/chmurson/Dev/goprojects/misc/src/helloworld/start.go:99       fmt.Println(x)(gdb) p xPython Exception <type 'exceptions.OverflowError'> signed integer is greater than maximum: $1 = (gdb) p i$2 = 8725692800(gdb) 您可以看到在检查 'p' 变量时存在 Python 异常，而在显示 'i' 的值时完全不是 3。怎么了 ？

Answer 1

添加到@AlexAtNet 的答案中，Go 1.2.x 之后的所有内容都破坏了 GDB 支持，因此要么使用 go 1.2.x 进行调试，要么使用 gccgo（请记住，gcc 4.8.x 支持 go 1.1，gcc 4.9.x 最高为 1.2） .

另一种选择是使用您自己的跟踪功能，虽然不漂亮，但它是目前 go 1.3+ 唯一真正的调试选项。

我个人使用这样的东西进行调试：

var traceLock sync.Mutex

func trace(a ...interface{}) {

    traceLock.Lock()

    pc, f, ln, ok := runtime.Caller(1)

    fn := ""

    if ok {

        fn = runtime.FuncForPC(pc).Name()

    }

    fmt.Printf("trace: %s %s:%d", fn, filepath.Base(f), ln)

    if len(a) > 0 {

        fmt.Println(append([]interface{}{": "}, a...)...)

    }

    traceLock.Unlock()

}