With `--std=c99` option coroutine/arm64/Context.h errs:
```
In file included from cont.c:26:
coroutine/arm64/Context.h:59:5: error: call to undeclared function 'asm'; ISO C99 and later do not support
implicit function declarations [-Wimplicit-function-declaration]
59 | asm ("hint #8;" : "+r"(r17) : "r"(r16));
| ^
```
Also move the common function header.
In WebAssembly C ABI, the linear stack pointer must be always aligned
to 16 bytes like other archs.
The misaligned stack pointer causes some weird memory corruption since
compiler assumes the aligned stack pointer.
We don't need to save/restore x30 twice, and we can just use `ret`,
which uses x30 as return address register instead of explicit `ret <reg>`
instruction. This also allows us to use `autiasp` instead of `autia1716`
and we can skip setting SP/LR to x16/x17.
Also the size of register save area is shrunk by 16 bytes due to the
removal of extra x30 save/restore.
No encodings are guaranteed in C compilers, and other than UTF-8
encodings may be assumed in some platforms, e.g., CP932 on Windows
Japanese edition, and may result in compilation errors.
* add coroutines for ppc & ppc64
* fix universal coroutine to include ppc & ppc64
* add powerpc*-darwin to configure.ac
* fix thread_pthread for older systems
OpenBSD is the only platform that uses this support by default,
and it did not work because while OpenBSD supports alloca, it does
not include alloca.h.
This should be backported to Ruby 2.7.
From George Koehler
Saves comitters' daily life by avoid #include-ing everything from
internal.h to make each file do so instead. This would significantly
speed up incremental builds.
We take the following inclusion order in this changeset:
1. "ruby/config.h", where _GNU_SOURCE is defined (must be the very
first thing among everything).
2. RUBY_EXTCONF_H if any.
3. Standard C headers, sorted alphabetically.
4. Other system headers, maybe guarded by #ifdef
5. Everything else, sorted alphabetically.
Exceptions are those win32-related headers, which tend not be self-
containing (headers have inclusion order dependencies).
We use COROUTINE_LIMITED_ADDRESS_SPACE to select platforms where address
space is 32-bits or less. Fiber pool implementation enables more book
keeping, and reduces upper limits, in order to minimise address space
utilisation.
