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dff70b50d0
the original rb_wasm_setjmp implementation always unwinds to the root
call frame to have setjmp compatible interface, and simulate sjlj's
undefined behavior. Therefore, every vm_exec call unwinds to main, and
a deep call stack makes setjmp call very expensive. The following
snippet from optcarrot takes 5s even though it takes less than 0.3s on
native.
```
[0x0, 0x4, 0x8, 0xc].map do |attr|
(0..7).map do |j|
(0...0x10000).map do |i|
clr = i[15 - j] * 2 + i[7 - j]
clr != 0 ? attr | clr : 0
end
end
end
```
This patch adds a WASI specialized vm_exec which uses lightweight
try-catch API without unwinding to the root frame. After this patch, the
above snippet takes only 0.5s.
23 lines
881 B
C
23 lines
881 B
C
#ifndef RB_WASM_SUPPORT_ASYNCIFY_H
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#define RB_WASM_SUPPORT_ASYNCIFY_H
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__attribute__((import_module("asyncify"), import_name("start_unwind")))
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void asyncify_start_unwind(void *buf);
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#define asyncify_start_unwind(buf) do { \
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extern void *rb_asyncify_unwind_buf; \
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rb_asyncify_unwind_buf = (buf); \
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asyncify_start_unwind((buf)); \
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} while (0)
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__attribute__((import_module("asyncify"), import_name("stop_unwind")))
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void asyncify_stop_unwind(void);
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#define asyncify_stop_unwind() do { \
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extern void *rb_asyncify_unwind_buf; \
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rb_asyncify_unwind_buf = NULL; \
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asyncify_stop_unwind(); \
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} while (0)
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__attribute__((import_module("asyncify"), import_name("start_rewind")))
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void asyncify_start_rewind(void *buf);
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__attribute__((import_module("asyncify"), import_name("stop_rewind")))
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void asyncify_stop_rewind(void);
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#endif
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