The attached small patch is "poor man's valgrind": it injects a dose of logging into Newx() et alia so that if PERL_MEM_LOG is defined in compile-time, all Newx() et alia calls go through logging functions, which most importantly pass in the source code file and linenumber.
By default the logging functions do nothing (still giving a useful breakpoint opportunity), but if PERL_MEM_LOG_STDERR was also defined during compile, a logging message is sent to the STDERR. With this one gets from e.g. "miniperl -e 1" log like the following: alloc: sv.c:233: 4080 1 char = 4080: 140029000 alloc: sv.c:1090: 4080 1 char = 4080: 140030000 alloc: sv.c:1090: 4080 1 char = 4080: 140031000 alloc: sv.c:1090: 4064 1 char = 4064: 140032000 alloc: sv.c:1090: 4080 1 char = 4080: 140033000 alloc: scope.c:49: 1 56 PERL_SI = 56: 140028b00 alloc: sv.c:1090: 4080 1 char = 4080: 140034000 alloc: av.c:157: 128 8 SV* = 1024: 140009e00 alloc: scope.c:60: 55 144 PERL_CONTEXT = 7920: 140036000 alloc: perl.c:4318: 128 8 SV* = 1024: 14000a300 alloc: perl.c:4323: 32 4 I32 = 128: 140009a40 alloc: perl.c:4329: 32 4 I32 = 128: 140009ae0 alloc: perl.c:4333: 128 8 ANY = 1024: 14002dc00 alloc: util.c:767: 2 1 char = 2: 140035000 alloc: util.c:767: 2 1 char = 2: 140035020 alloc: util.c:767: 2 1 char = 2: 140035040 free: locale.c:209: 0 alloc: util.c:767: 2 1 char = 2: 140035060 free: locale.c:123: 0 alloc: util.c:767: 2 1 char = 2: 140035080 ... free: opmini.c:315: 140005be0 free: opmini.c:457: 0 free: opmini.c:315: 140050e00 free: opmini.c:315: 140050bc0 free: opmini.c:315: 140050ec0 free: av.c:501: 140005c10 free: av.c:501: 0 free: av.c:501: 140005c40 free: perl.c:754: 0 free: perlio.c:704: 14003bde0 free: perlio.c:704: 140005bb0 free: perlio.c:704: 14003bd90 free: perlio.c:704: 140005b80 free: perlio.c:704: 14003bd40 free: perlio.c:704: 140005b50 free: perlio.c:564: 14003be80 free: perlio.c:590: 14003bc00 free: perlio.c:592: 140005b20 free: perlio.c:590: 14002ef60 free: perlio.c:592: 140005a60 621 allocs, 2 reallocs, and 62 frees. Known problems: - all memory allocs do not get logged, only those that go through Newx() and derivatives (while all Safefrees do get logged) - __FILE__ and __LINE__ do not work everywhere. - I think more goes on after the perlio frees but the thing is that STDERR gets closed (as do all the file descriptors) - no deeper calling stack than the caller of the Newx or the kind, but do I look like a C reflection/introspection utility to you? - the function prototypes for the logging functions probably should maybe be somewhere else than handy.h - one could consider inlining (macrofying) the logging for speed, but I am too lazy - one could imagine recording the allocations in a hash, (keyed by the allocation address?), and maintain that through reallocs and frees, but how to do that without any News() happening...?
memlog.pat.gz
Description: GNU Zip compressed data
