是否可以将 python gdb 变量捕获到值历史记录中？答案

【问题标题】：Is it possible to capture python gdb variables into the value history?是否可以将 python gdb 变量捕获到值历史记录中？
【发布时间】：2015-11-29 17:56:08
【问题描述】：

我有一个写入gdb.STDOUT 的python gdb 脚本，我想将此值捕获到value history 或convenience variable 中，以便于引用。

例如，这个脚本迭代一个链表并转储输出：

(gdb) list MY_OBJECT Links myObjectList 4
(MY_OBJECT *) 0x80f830198
{ReferenceCount = 1, Flags = 0, Mutex = {Mutex = 0x80f80fe50, State = 1}, Links = {Next = 0x81182f138, Prev = 0x80f80f5a8}}
(MY_OBJECT *) 0x81182f0d8
{ReferenceCount = 6, Flags = 0, Mutex = {Mutex = 0x811815790, State = 1}, Links = {Next = 0x81182f1f8, Prev = 0x80f8301f8}}
(MY_OBJECT *) 0x81182f198
{ReferenceCount = 2, Flags = 0, Mutex = {Mutex = 0x811816830, State = 1}, Links = {Next = 0x80f8302b8, Prev = 0x81182f138}}
(MY_OBJECT *) 0x80f830258
{ReferenceCount = 1, Flags = 0, Mutex = {Mutex = 0x80f8528e0, State = 1}, Links = {Next = 0x80f80f5a8, Prev = 0x81182f1f8}}

是否可以写入 gdb 值历史记录？也许通过gdb.parse_and_eval()？

【问题讨论】：

标签： python c gdb

【解决方案1】：

我通过实验发现可以直接从python api命令执行gdb命令，它们会被捕获到值历史中。

因此，与其使用 python 中的gdb.write("%s" % myObject) 或print，不如使用gdb.execute("print %s" % myObject)，这会产生所需的副作用。

(gdb) list MY_OBJECT Links myObjectList 4
$1 = {ReferenceCount = 1, Flags = 0, Mutex = {Mutex = 0x80f80fe50, State = 1}, Links = {Next = 0x81182f138, Prev = 0x80f80f5a8}}
$2 = {ReferenceCount = 6, Flags = 0, Mutex = {Mutex = 0x811815790, State = 1}, Links = {Next = 0x81182f1f8, Prev = 0x80f8301f8}}
$3 = {ReferenceCount = 2, Flags = 0, Mutex = {Mutex = 0x811816830, State = 1}, Links = {Next = 0x80f8302b8, Prev = 0x81182f138}}
$4 = {ReferenceCount = 1, Flags = 0, Mutex = {Mutex = 0x80f8528e0, State = 1}, Links = {Next = 0x80f80f5a8, Prev = 0x81182f1f8}}

(gdb) print &$1
$5 = (MY_OBJECT *) 0x80f830198

【讨论】：