From 65f95f26ff0e7b4be4704fedc52344a26d22a4e2 Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@gmail.com>
Date: Sat, 15 Jan 2022 23:10:48 +0900
Subject: [wasm] add asyncify based setjmp, fiber, register scan emulation

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
---
 tool/m4/ruby_wasm_tools.m4 | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 tool/m4/ruby_wasm_tools.m4

(limited to 'tool/m4')

diff --git a/tool/m4/ruby_wasm_tools.m4 b/tool/m4/ruby_wasm_tools.m4
new file mode 100644
index 0000000000..d58de88ec8
--- /dev/null
+++ b/tool/m4/ruby_wasm_tools.m4
@@ -0,0 +1,21 @@
+dnl -*- Autoconf -*-
+AC_DEFUN([RUBY_WASM_TOOLS],
+[AS_CASE(["$target_os"],
+[wasi*], [
+    AC_CHECK_TOOL(WASMOPT, wasm-opt)
+    AS_IF([test x"${WASMOPT}" = x], [
+        AC_MSG_ERROR([wasm-opt is required])
+    ])
+    AC_SUBST(wasmoptflags)
+    : ${wasmoptflags=-O3}
+
+    AC_MSG_CHECKING([wheather \$WASI_SDK_PATH is set])
+    AS_IF([test x"${WASI_SDK_PATH}" = x], [AC_MSG_RESULT([no])], [
+        AC_MSG_RESULT([yes])
+        CC="${WASI_SDK_PATH}/bin/clang"
+        LD="${WASI_SDK_PATH}/bin/clang"
+        AR="${WASI_SDK_PATH}/bin/llvm-ar"
+        RANLIB="${WASI_SDK_PATH}/bin/llvm-ranlib"
+    ])
+])
+])dnl
-- 
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