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more notes on windows overriding

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daan 2020-04-20 09:56:55 -07:00
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@ -286,9 +286,13 @@ the [shell](https://stackoverflow.com/questions/43941322/dyld-insert-libraries-i
### Override on Windows
<span id="override_on_windows">Overriding on Windows</span> is robust but requires that you link your program explicitly with
<span id="override_on_windows">Overriding on Windows</span> is robust and has the
particular advantage to be able to redirect all malloc/free calls that go through
the (dynamic) C runtime allocator, including those from other DLL's or libraries.
The overriding on Windows requires that you link your program explicitly with
the mimalloc DLL and use the C-runtime library as a DLL (using the `/MD` or `/MDd` switch).
Moreover, you need to ensure the `mimalloc-redirect.dll` (or `mimalloc-redirect32.dll`) is available
Also, the `mimalloc-redirect.dll` (or `mimalloc-redirect32.dll`) must be available
in the same folder as the main `mimalloc-override.dll` at runtime (as it is a dependency).
The redirection DLL ensures that all calls to the C runtime malloc API get redirected to
mimalloc (in `mimalloc-override.dll`).
@ -303,8 +307,9 @@ is also recommended to also override the `new`/`delete` operations (by including
The environment variable `MIMALLOC_DISABLE_REDIRECT=1` can be used to disable dynamic
overriding at run-time. Use `MIMALLOC_VERBOSE=1` to check if mimalloc was successfully redirected.
(Note: in principle, it is possible to patch existing executables
that are linked with the dynamic C runtime (`ucrtbase.dll`) by just putting the `mimalloc-override.dll` into the import table (and putting `mimalloc-redirect.dll` in the same folder)
(Note: in principle, it is possible to even patch existing executables without any recompilation
if they are linked with the dynamic C runtime (`ucrtbase.dll`) -- just put the `mimalloc-override.dll`
into the import table (and put `mimalloc-redirect.dll` in the same folder)
Such patching can be done for example with [CFF Explorer](https://ntcore.com/?page_id=388)).