From a0f1ffbe4b68125141217e63b02d528cd779084f Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@gmail.com>
Date: Mon, 1 Jul 2024 13:40:17 +0900
Subject: [PATCH] Add WASI hello world program example

---
 Examples/hello.swift |  27 +++++++++++++++++++++++++++
 Examples/hello.wasm  | Bin 0 -> 286 bytes
 2 files changed, 27 insertions(+)
 create mode 100644 Examples/hello.swift
 create mode 100755 Examples/hello.wasm

diff --git a/Examples/hello.swift b/Examples/hello.swift
new file mode 100644
index 00000000..cabb4f04
--- /dev/null
+++ b/Examples/hello.swift
@@ -0,0 +1,27 @@
+// Compile: swiftc ./hello.swift -o hello.wasm -target wasm32-unknown-none-wasm -enable-experimental-feature Extern -enable-experimental-feature Embedded -wmo -Xcc -fdeclspec -Xclang-linker -nostdlib -Xfrontend -disable-stack-protector -Osize
+// Swift version: DEVELOPMENT-SNAPSHOT-2024-06-13-a
+
+// This is a simple WASI program written in Embedded Swift.
+
+@_extern(wasm, module: "wasi_snapshot_preview1", name: "fd_write")
+@_extern(c)
+func fd_write(fd: Int32, iovs: UnsafeRawPointer, iovs_len: Int32, nwritten: UnsafeMutablePointer<Int32>) -> Int32
+
+func _print(_ string: StaticString) {
+    string.withUTF8Buffer { string in
+        withUnsafeTemporaryAllocation(byteCount: 8, alignment: 4) { iov in
+            let iov = iov.baseAddress!
+            iov.advanced(by: 0).storeBytes(of: string.baseAddress!, as: UnsafeRawPointer.self)
+            iov.advanced(by: 4).storeBytes(of: Int32(string.count), as: Int32.self)
+            var nwritten: Int32 = 0
+            _ = fd_write(fd: 1, iovs: iov, iovs_len: 1, nwritten: &nwritten)
+        }
+    }
+}
+
+// The entry point of this WASI program.
+@_expose(wasm, "_start")
+@_cdecl("_start")
+func _start() {
+    _print("Hello, World!\n")
+}
diff --git a/Examples/hello.wasm b/Examples/hello.wasm
new file mode 100755
index 0000000000000000000000000000000000000000..59794330bbe7268ca3e38881b6389b7029ca855c
GIT binary patch
literal 286
zcmW-bKTg9i7{$NO4IyfxHWCs7ra~*0v`Ae7tHr_zfX#KO6WlsUu^j?aU}J+LZ~<mE
zj=(*bxd1M2d4Kd99&l420ANIBUh9PI41f%Ax8X)IQ}VUBtt?w>aW6$P4YCDmw6p@C
zLlCz*2*eMtMf(2Yh1)yCFGNx4M*==GmTL>xJx7Y99RiJ4M=*lHe?S+I_EO?GdkRvr
z*&!tnMK_=;(K3dE4ZIvd7$yW97WOWLQq_2HRcW<2>;ioa!uZrb{yBTT{{H-WyZQLN
zyo3F{6Vu4dP8qLlrDVBcqO@8H1LMAXl?%%<!ELRDAxXceEuSkf$yGJy$|Ql2c{vde
F_7Bz8Nt6Hp

literal 0
HcmV?d00001