I use a bunch of terminal windows. I have vim running on interesting source files, make and g++ output on another for compiler errors or a gdb session for runtime errors. If I need help finding definitions I run cscope and use vim’s cscope support to jump around. Eclipse CDT is my second choice. It’s … Read more
Line 1327 from the valgrind source code points to the user manual, “see section Limitations in user manual”: Limits section item 1: On Linux, Valgrind determines at startup the size of the ‘brk segment’ using the RLIMIT_DATA rlim_cur, with a minimum of 1 MB and a maximum of 8 MB. Valgrind outputs a message each … Read more
You can also use gdb instead of addr2line to examine memory address. Load executable file in gdb and print the name of a symbol which is stored at the address. 16 Examining the Symbol Table. (gdb) info symbol 0x4005BDC
Visual Studio 2019 has a decent memory analysis tool, it may be used interactively while debugging or by programming (without debugging), I show a minimal example in both cases in the following. The main idea is to take a snapshot of the heap at the beginning and at the end of the process, then to … Read more
The important pieces of your code line by line… Allocate memory for one Person object: auto p = (Person*)malloc(sizeof(Person)); Construct a Person object in that already allocated memory via calling its constructor: p = new(p)Person(); Free the memory allocated via malloc: free(p); Calling the constructor via placement new creates a std::string. That string would be … Read more
It looks like you are entering The Lost World here. I don’t think the problem is with c-bindings in racc either. Ruby memory management is both elegant and cumbersome. It stores objects (named RVALUEs) in so-called heaps of size of approx 16KB. On a low level, RVALUE is a c-struct, containing a union of different … Read more
Assuming you are running the memcheck tool and you want to ignore Leak errors in libcrypto only, you could put a suppression like: { ignore_libcrypto_conditional_jump_errors Memcheck:Leak … obj:*/libcrypto.so.* } … into a file and pass it to valgrind with –suppressions=*FILENAME*. To ignore Leak errors in all shared libraries under any lib directory (/lib, /lib64, /usr/lib, … Read more
A (rather painful) install from source workaround based on this patch, this post and this answer. $ git clone https://github.com/Echelon9/valgrind.git $ cd valgrind $ git checkout feature/v3.14/macos-mojave-support-v2 $ ./autogen.sh $ ./configure –prefix=/where/you/want/it/installed –enable-only64bit $ make If you get the following error: No rule to make target ‘/usr/include/mach/mach_vm.defs’, you will need to run xcode-select –install. You … Read more
The output you provided in your question contains the following line: ==5190== Use –track-origins=yes to see where uninitialised values come from Per this message you should run ./ex4 like this: valgrind –track-origins=yes ./ex4 To avoid some problems with Valgrind unable to find debug information, you can use static linking: gcc -static -g -o ex4 ex4.c … Read more
Since python 3.6, there’s a PYTHONMALLOC environment variable which is available in release builds, without needing to recompile. PYTHONMALLOC=malloc python3 foobar.py This will disable pymalloc and just use the libc malloc directly, making it valgrind-friendly. This is equivalent to –without-pymalloc (and it is just as slow) If valgrind is too slow, other values can be … Read more