Valgrind is a GPL'd tool to help you find memory-management problems in your programs. When a program is run under Valgrind's supervision, all reads and writes of memory are checked, and calls to malloc/new/free/delete are intercepted.
Valgrind can debug more or less any dynamically-linked ELF x86/Linux, amd64/Linux and ppc/Linux executables, without modification, recompilation, or anything.
Valgrind provides a generic infrastructure for supervising the execution of programs called "tools". This is done by providing a way to instrument programs in very precise ways, making it relatively easy to support activities such as dynamic error detection and profiling. The Valgrind distribution currently includes three tools: a memory error detectors, a cache (time) profiler and a heap (space) profiler.
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