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[wasm] add asyncify based setjmp, fiber, register scan emulation

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configure.ac: setup build tools and register objects

main.c: wrap main with rb_wasm_rt_start to handle asyncify unwinds

tool/m4/ruby_wasm_tools.m4: setup default command based on WASI_SDK_PATH
environment variable. checks wasm-opt which is used for asyncify.

tool/wasm-clangw wasm/wasm-opt: a clang wrapper which replaces real
wasm-opt with do-nothing wasm-opt to avoid misoptimization before
asyncify. asyncify is performed at POSTLINK, but clang linker driver
tries to run optimization by wasm-opt unconditionally. inlining pass
at wasm level breaks asyncify's assumption, so should not optimize
before POSTLIK.

wasm/GNUmakefile.in: wasm specific rules to compile objects
This commit is contained in:
Yuta Saito 2022-01-15 23:10:48 +09:00
parent e41b121e94
commit 65f95f26ff
Notes: git 2022-01-19 11:19:45 +09:00
16 changed files with 640 additions and 1 deletions
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27
wasm/setjmp_core.S Normal file
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# extern int _rb_wasm_setjmp_internal(rb_wasm_jmp_buf *env);
.functype _rb_wasm_setjmp_internal (i32) -> (i32)
# extern int __stack_pointer;
.globaltype __stack_pointer, i32
# A wrapper of _rb_wasm_setjmp_internal to save and restore stack pointer
# This cannot be implemented in C because there is no way to manipulate stack pointer
# without C-epilogue.
# extern int _rb_wasm_setjmp(rb_wasm_jmp_buf *env);
.section .text._rb_wasm_setjmp,"",@
.globl _rb_wasm_setjmp
.type _rb_wasm_setjmp,@function
_rb_wasm_setjmp:
.functype _rb_wasm_setjmp (i32) -> (i32)
.local i32, i32
# save sp (this local is stored in asyncify stack and restored when rewinding)
global.get __stack_pointer
local.set 1
local.get 0
call _rb_wasm_setjmp_internal
# restore sp
local.get 1
global.set __stack_pointer
end_function