（我的第一篇关于堆栈溢出的帖子，希望我使用的是正确的格式）
我需要评估在“安全”隔间中操作 64 位整数的代码。由于我提供了要评估的脚本和代码，因此我可以进行正常的评估，但我想尝试通过使用“安全”来使事情变得更加健壮，以防止意外错误。
我是否应该期望 Math::Int64 应该在“安全”隔间内正常工作？在 Perl 版本、整数位宽和操作系统的不同位数中，我得到了相互矛盾的结果。（见下文）。
在调试器中都以相同的方式失败。
我确定我在某个地方做了一些不正确的假设，但不知道在哪里。
谢谢你提供的所有帮助。
代码示例 (dummy.pl)
use strict;
use warnings;
use Exporter;
use Safe;
use Math::Int64 qw(int64 hex_to_int64);
#use Math::Int64 ':native_if_available';
my $safe = new Safe 'Root';
$safe->permit( qw(:browse) );
$safe->share( qw/int64 hex_to_int64 my_sprintf/ );
my $X = 0xFF & (hex_to_int64("0xAA12345678") >> 4);
print my_sprintf("X ",$X);
my $Z = evalme('$X = 0xFF & (hex_to_int64("0xAA12345678") >> 4)', $safe);
print my_sprintf("Z ",$Z);
print evalme('my_sprintf("Xe", $X)',$safe);
exit;
sub my_sprintf {
my ($string, $value) = @_;
return sprintf( "Value of %s: %X,\tType: %s\n",
$string, $value, ref($value) || "scalar"
);
}
sub evalme {
my($expr, $safe) = @_;
my $retval = $safe->reval($expr);
die "Error: $@\n" if ($@);
return $retval;
}
执行示例
% perl -w dummy.pl
=== "Win7 x64 SP1, Strawberry Perl 5.12.3" ===
Value of X : 67, Type: Math::Int64
Can't locate package Exporter for @Math::Int64::ISA at (eval 5) line 1.
...
Can't locate package Exporter for @Math::Int64::ISA at (eval 5) line 1.
Value of Z : 67, Type: Math::Int64
Value of Xe: 67, Type: Math::Int64
=== "Win XP SP3 32-bit Strawberry Perl 5.16.0" ===
Value of X : 67, Type: Math::Int64
Value of Z : 8E, Type: scalar
Value of Xe: 8E, Type: scalar
(No ':native-if-available')
=== "Ubuntu 10.04 x86_64 Server, Perl 5.10.1" ===
Value of X : 67, Type: Math::Int64
Value of Z : 4D, Type: scalar
Value of Xe: 4D, Type: scalar
(':native-if-available')
=== "Ubuntu 10.04 x86_64 Server, Perl 5.10.1" ===
Value of X : 67, Type: scalar
Value of Z : 71, Type: scalar
Value of Xe: 71, Type: scalar
% perl -wd dummy.pl
All versions return effectively:
Value of X : 67, Type: Math::Int64
Error: Undefined subroutine &Math::Int64::hex_to_int64 called at c:/.../perl5db.
at dummy.pl line 35
main::evalme('$X = 0xFF & (hex_to_int64("0xAA12345678") >> 4)',
'Safe=HASH(xxxxxxxx)'
版本
"Win7 x64 SP1, Strawberry Perl 5.12.3":
Platform:
osname=MSWin32, osvers=6.1, archname=MSWin32-x64-multi-thread
uname='Win32 strawberryperl 5.12.3.0 #1 Sun May 15 09:43:50 2011 x64'
use64bitint=define, use64bitall=undef, uselongdouble=undef
Compiler:
intsize=4, longsize=4, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long long', ivsize=8, nvtype='double', nvsize=8, Off_t='long long',
Characteristics of this binary (from libperl):
Compile-time options: ... USE_64_BIT_INT
"Win XP 32-bit Strawberry Perl 5.16.0":
Platform:
osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread
uname='Win32 strawberry-perl 5.16.0.1 #1 Mon May 21 22:07:30 2012 i386'
use64bitint=undef, use64bitall=undef, uselongdouble=undef
Compiler:
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='long long',
Characteristics of this binary (from libperl):
Compile-time options: ...
"Ubuntu 10.04 x86_64 Server, Perl 5.10.1":
Linux 2.6.32-31-server,
Platform:
use64bitint=define, use64bitall=define, uselongdouble=undef
Compiler:
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t',
Characteristics of this binary (from libperl):
Compile-time options: ... USE_64_BIT_ALL USE_64_BIT_INT