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ig-debugheap - A debugging heap
This is a debug heap useful when trying to track down memory errors (especially on Windows, where there's no Valgrind.) It is written in C, and works on Mac, Linux and Windows.
This package provides the following features:
Array indexing errors (positive) trigger crashes, because allocations are aligned as closely as possible up to an inaccessible virtual memory page.
Using memory after freeing it triggers a crash most of the time.
Double frees are detected most of the time.
Unsynchronized multi-threaded access is detected.
To improve the chances of crashing on use-after-free or double frees, increase the size of the heap. Freed blocks are kept on an "observation list" for as long as possible to flush out these error classes, but it will eventually be reused.
This heap is terribly slow, and wastes tons of memory. You only want to use it to track down memory errors. One neat way of doing that is to provide a heap interface that can dynamically switch to this heap, maybe with a configuration option. You can then hunt for memory errors without recompiling.
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