我按照这里所描述的方法,使用DEBUG_LEAKING_SCALARS
编译perl。
案例1
我遵循此文档测试内存泄漏报告:
env PERL_DESTRUCT_LEVEL=2 valgrind perl -e '@x; $x[0]=\@x'
==7216== Memcheck, a memory error detector
==7216== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==7216== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==7216== Command: perl -e @x;\ $x[0]=\\@x
==7216==
==7216==
==7216== HEAP SUMMARY:
==7216== in use at exit: 0 bytes in 0 blocks
==7216== total heap usage: 1,310 allocs, 1,310 frees, 171,397 bytes allocated
==7216==
==7216== All heap blocks were freed -- no leaks are possible
==7216==
==7216== For counts of detected and suppressed errors, rerun with: -v
==7216== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
没有报告。
案例2
我甚至在我的XS子程序中执行这个操作。确切地说:
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "XSUtils.h"
#include "ppport.h"
void
call_perl() {
SV *sv;
sv = sv_2mortal( newSVpv( "XS::Utils::hello", 0 ) );
newSViv( 323 ); //<<<< SHOULD LEAK
printf( "Hi 3\n" );
ENTERSCOPE;
CALLPERL( sv , G_DISCARD|G_NOARGS );
LEAVESCOPE;
}
MODULE = XS::Utils PACKAGE = XS::Utils
void
test()
CODE:
call_perl();
$ env PERL_DESTRUCT_LEVEL=2 valgrind perl -Iblib/arch/ -Iblib/lib -MXS::Utils -e 'XS::Utils::test()'
==7308== Memcheck, a memory error detector
==7308== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==7308== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==7308== Command: perl -Iblib/arch/ -Iblib/lib -MXS::Utils -e XS::Utils::test()
==7308==
Hi 3
Hello
==7308==
==7308== HEAP SUMMARY:
==7308== in use at exit: 1,502 bytes in 5 blocks
==7308== total heap usage: 12,876 allocs, 12,871 frees, 1,945,298 bytes allocated
==7308==
==7308== LEAK SUMMARY:
==7308== definitely lost: 0 bytes in 0 blocks
==7308== indirectly lost: 0 bytes in 0 blocks
==7308== possibly lost: 0 bytes in 0 blocks
==7308== still reachable: 1,502 bytes in 5 blocks
==7308== suppressed: 0 bytes in 0 blocks
==7308== Rerun with --leak-check=full to see details of leaked memory
==7308==
==7308== For counts of detected and suppressed errors, rerun with: -v
==7308== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
没有任何报告
CASE 3
我修复了模块Devel::LeakTrace(FIX):
$ perl -MDevel::LeakTrace -Iblib/arch/ -Iblib/lib -MXS::Utils -e 'XS::Utils::test()'
Hi 3
Hello
没有任何报告
案例4
我只发现Test::LeakTrace能够胜任:
$ perl -MTest::LeakTrace::Script=-verbose -Iblib/arch/ -Iblib/lib -MXS::Utils -e 'XS::Utils::test()'
Hi 3
Hello
leaked SCALAR(0x208e1c0) from -e line 1.
ALLOCATED at -e:1 by entersub (parent 0x0); serial 9642
SV = IV(0x208e1b0) at 0x208e1c0
REFCNT = 1
FLAGS = (IOK,pIOK)
IV = 323
为什么Perl中的内置工具没有报告泄漏问题?
我做错了什么?如何使用DEBUG_LEAKING_SCALARS
工具调试泄漏的内存?