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nimRawSetjmp: support Windows (#19197)

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* nimRawSetjmp: support Windows

Using `_setjmp()` directly is required to avoid some rare (but very
annoying) exception-related stack corruption leading to segfaults on
Windows, with Mingw-w64 and SEH.
More details: https://github.com/status-im/nimbus-eth2/issues/3121

Also add "nimBuiltinSetjmp" - mostly for benchmarking.

* fix for Apple's Clang++
This commit is contained in:
Ștefan Talpalaru 2021-12-10 06:31:29 +01:00 • committed by GitHub
commit 69aabdab80
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5 changed files with 199 additions and 10 deletions
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14
doc/nimc.rst
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@ -165,6 +165,20 @@ ignored too. `--define:FOO`:option: and `--define:foo`:option: are identical.
Compile-time symbols starting with the `nim` prefix are reserved for the
implementation and should not be used elsewhere.
========================== ============================================
Name Description
========================== ============================================
nimStdSetjmp Use the standard `setjmp()/longjmp()` library
functions for setjmp-based exceptions. This is
the default on most platforms.
nimSigSetjmp Use `sigsetjmp()/siglongjmp()` for setjmp-based exceptions.
nimRawSetjmp Use `_setjmp()/_longjmp()` on POSIX and `_setjmp()/longjmp()`
on Windows, for setjmp-based exceptions. It's the default on
BSDs and BSD-like platforms, where it's significantly faster
than the standard functions.
nimBuiltinSetjmp Use `__builtin_setjmp()/__builtin_longjmp()` for setjmp-based
exceptions. This will not work if an exception is being thrown
and caught inside the same procedure. Useful for benchmarking.
Configuration files
-------------------