Make header only library target.
Use the CMake INTERFACE target type to include the build settings for
snmalloc in other projects using headers only.
Made warnings setting a macro for reuse.
clang-tidy exits with an error code of 0 if the code compiles, even if
there are warnings. Make it generate a file with the errors and fail
the test if this file exists.
Also remove the -fix flag - we don't want clang-tidy to fix things in CI
(yet?).
This complains if a non-const parameter is not modified. In the PALs,
the size parameter is modified only by some implementations, so we can
make it const in the ones where it isn't.
Fix a false positive. The loops in the pagemap accessor are too
complicated for the static analyser to check, so it doesn't spot that a
non-null return is impossible.
Change the result of `operator=` on `Mod` to return `Mod&`. In this
example:
```c++
Mod<4, int> a;
int b = (a = 8);
```
The value of `b` will now be 0, not 8, and will equal the value of `a`.
Hopefully this is less confusing to users of this class.
This introduces a new `address_t` type and two new casts: `pointer_cast`
and `address_cast` for casting between an `address_t` and a pointer.
These should make it easier to audit the codebase for casts between
pointers and integers. In particular, the remaining `reinterpret_cast`s
and `pointer_cast`s should be the only places where we could perform
invalid pointer arithmetic.
Also adds a `pointer_offset` helper that adds an offset (in bytes) to a
pointer, preserving its original type. This is a sufficiently common
pattern that it seemed worthwhile to centralise it.
This is a generalisation of `std::nullptr_t` that allows non-0 values of
pointer-sized-but-not-a-pointer thing. `DLList` now takes an
`InvalidPointer`, `nullptr_t`, or some other compatible class as a
sentinel value instead of a `uintptr_t`.
