c++ valgrind ($19) · Snippets

valgrind:

$ /home/me/APPS/valgrind-3.18.1/bin/valgrind -s --leak-check=full ./test_simple     
==748203== Memcheck, a memory error detector
==748203== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==748203== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==748203== Command: ./test_simple
==748203== 
1 -6
2 -5.25
3 -4.5
4 -3.75
5 -3
6 -2.25
7 -1.5
8 -0.75
9 0
10 0.75
11 1.5
12 2.25
13 3
14 3.75
15 4.5
==748203== Invalid write of size 8
==748203==    at 0x1095B8: main (test_c++.cpp:47)
==748203==  Address 0x4ec8d00 is 0 bytes after a block of size 128 alloc'd
==748203==    at 0x483E217: operator new[](unsigned long) (vg_replace_malloc.c:640)
==748203==    by 0x109540: main (test_c++.cpp:45)
==748203== 
==748203== Invalid read of size 8
==748203==    at 0x1095F4: main (test_c++.cpp:48)
==748203==  Address 0x4ec8d00 is 0 bytes after a block of size 128 alloc'd
==748203==    at 0x483E217: operator new[](unsigned long) (vg_replace_malloc.c:640)
==748203==    by 0x109540: main (test_c++.cpp:45)
==748203== 
16 5.25
==748203== 
==748203== HEAP SUMMARY:
==748203==     in use at exit: 0 bytes in 0 blocks
==748203==   total heap usage: 3 allocs, 3 frees, 73,856 bytes allocated
==748203== 
==748203== All heap blocks were freed -- no leaks are possible
==748203== 
==748203== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
==748203== 
==748203== 1 errors in context 1 of 2:
==748203== Invalid read of size 8
==748203==    at 0x1095F4: main (test_c++.cpp:48)
==748203==  Address 0x4ec8d00 is 0 bytes after a block of size 128 alloc'd
==748203==    at 0x483E217: operator new[](unsigned long) (vg_replace_malloc.c:640)
==748203==    by 0x109540: main (test_c++.cpp:45)
==748203== 
==748203== 
==748203== 1 errors in context 2 of 2:
==748203== Invalid write of size 8
==748203==    at 0x1095B8: main (test_c++.cpp:47)
==748203==  Address 0x4ec8d00 is 0 bytes after a block of size 128 alloc'd
==748203==    at 0x483E217: operator new[](unsigned long) (vg_replace_malloc.c:640)
==748203==    by 0x109540: main (test_c++.cpp:45)
==748203== 
==748203== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)

en supprimant la ligne 47 dans le code, on a une erreur en moins

$ /home/me/APPS/valgrind-3.18.1/bin/valgrind -s --leak-check=full ./test_simple     
==747608== Memcheck, a memory error detector
==747608== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==747608== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==747608== Command: ./test_simple
==747608== 
==747608== Invalid write of size 8
==747608==    at 0x109534: main (test_c++.cpp:47)
==747608==  Address 0x4ec8d00 is 0 bytes after a block of size 128 alloc'd
==747608==    at 0x483E217: operator new[](unsigned long) (vg_replace_malloc.c:640)
==747608==    by 0x1094C0: main (test_c++.cpp:45)
==747608== 
==747608== 
==747608== HEAP SUMMARY:
==747608==     in use at exit: 0 bytes in 0 blocks
==747608==   total heap usage: 2 allocs, 2 frees, 72,832 bytes allocated
==747608== 
==747608== All heap blocks were freed -- no leaks are possible
==747608== 
==747608== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
==747608== 
==747608== 1 errors in context 1 of 1:
==747608== Invalid write of size 8
==747608==    at 0x109534: main (test_c++.cpp:47)
==747608==  Address 0x4ec8d00 is 0 bytes after a block of size 128 alloc'd
==747608==    at 0x483E217: operator new[](unsigned long) (vg_replace_malloc.c:640)
==747608==    by 0x1094C0: main (test_c++.cpp:45)
==747608== 
==747608== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)

pour compiler (ça vient d'un cmake):

c++ -g -O0 -std=c++11 -fopenmp -Wall -Wextra -Wconversion -Wshadow -Wpedantic CMakeFiles/test_fftw_simple.dir/test_fftw_simple.cpp.o  -o test_fftw_simple  /home/me/projets/CMake-hdf5-1.12.0/build/_CPack_Packages/Linux/TGZ/HDF5-1.12.0-Linux/HDF_Group/HDF5/1.12.0/lib/libhdf5.a /home/me/projets/CMake-hdf5-1.12.0/build/_CPack_Packages/Linux/TGZ/HDF5-1.12.0-Linux/HDF_Group/HDF5/1.12.0/lib/libhdf5_cpp.a -lfftw3l /home/me/projets/CMake-hdf5-1.12.0/build/_CPack_Packages/Linux/TGZ/HDF5-1.12.0-Linux/HDF_Group/HDF5/1.12.0/lib/libhdf5.a -ldl /home/me/projets/CMake-hdf5-1.12.0/build/_CPack_Packages/Linux/TGZ/HDF5-1.12.0-Linux/HDF_Group/HDF5/1.12.0/lib/libz.a /home/me/projets/CMake-hdf5-1.12.0/build/_CPack_Packages/Linux/TGZ/HDF5-1.12.0-Linux/HDF_Group/HDF5/1.12.0/lib/libszip.a -lm