[英]How can I use Perl 5.10 features inside the debugger?
I am unable to evaluate 'modern Perl' code inside the Perl debugger.我无法评估 Perl 调试器中的“现代 Perl”代码。 It works OK when debugging the code in a file, but not from the prompt.
在文件中调试代码时它可以正常工作,但不能从提示中调试。
Minimal example:最小的例子:
# Activating 5-10 features with -E (it works)
$ perl -E 'say "x"'
x
# Calling the debugger with -E # It works for infile code, but for prompt line code... $ perl -dEbug Loading DB routines from perl5db.pl version 1.33 DB say "x" String found where operator expected at (eval 16)[/local-perl/lib/5.12.1/perl5db.pl:638] line 2, near "say "x"" at (eval 16)[/local-perl/lib/5.12.1/perl5db.pl:638] line 2 eval '($@, $!, $^E, $,, $/, $\\, $^W) = @saved;package main; $^D = $^D | $DB::db_stop;say "x";
(Note: the same happens with "use feature ':5.10'".) (注意:“使用功能':5.10'”也会发生同样的情况。)
Am I missing something?我错过了什么吗?
I found a reference to the issue here , but it's about a year old.我在这里找到了对这个问题的引用,但它已经有大约一年的历史了。 However, the relevant portion of the Perl source hasn't changed since and can be seen here .
但是,Perl 源代码的相关部分从那时起就没有改变,可以在这里看到。 Essentially, if you take a look at
toke.c
in the Perl source, you see the following:本质上,如果您查看 Perl 源代码中的
toke.c
,您会看到以下内容:
if (PL_perldb) {
/* Generate a string of Perl code to load the debugger.
* If PERL5DB is set, it will return the contents of that,
* otherwise a compile-time require of perl5db.pl. */
const char * const pdb = PerlEnv_getenv("PERL5DB");
...
}
...
if (PL_minus_E)
sv_catpvs(PL_linestr,
"use feature ':5." STRINGIFY(PERL_VERSION) "';");
Basically, the debugger is loaded before the -E
flag is processed, so the features aren't yet enabled when the debugger gets loaded.基本上,调试器在处理
-E
标志之前加载,因此在加载调试器时尚未启用这些功能。 The gist of this is that you can't currently use -E
with the -d
command.其要点是您目前不能将
-E
与-d
命令一起使用。 If you want to use say
, switch
, or any other feature from the debug prompt, you have to do it like this:如果您想在调试提示中使用
say
、 switch
或任何其他功能,您必须这样做:
DB<1> use feature 'say'; say "x"
x
The closest I've seen to a solution is:我见过的最接近解决方案的是:
- copy perl5db.pl from your PERL5LIB to either somewhere in PERL5LIB or the current directory, with a different name, say myperl5db.pl 2. Edit myperl5db.pl to have use feature ':5.10';
将 perl5db.pl 从您的 PERL5LIB 复制到 PERL5LIB 或当前目录中的某个位置,使用不同的名称,例如 myperl5db.pl 2. 编辑 myperl5db.pl 以使用功能“:5.10”; (or just 'state', or just 'say') on the first line.
(或只是“状态”,或只是“说”)在第一行。 3. Set the environment variable PERL5DB to "BEGIN { require 'myperl5db.pl' }"
3.设置环境变量PERL5DB为“BEGIN { require 'myperl5db.pl' }”
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