add a wat

yamt · May 31, 2023 · 6ea0d5a · 6ea0d5a
1 parent 38537d8
commit 6ea0d5a
Showing 1 changed file with 44 additions and 0 deletions.
diff --git a/wat/wasi/recursive_hello.wat b/wat/wasi/recursive_hello.wat
@@ -0,0 +1,44 @@
+;; print hello
+
+(module
+  (func $fd_write (import "wasi_snapshot_preview1" "fd_write") (param i32 i32 i32 i32) (result i32))
+  (func $proc_exit (import "wasi_snapshot_preview1" "proc_exit") (param i32))
+  (func $putstrz (param $p i32)
+    (local $tmp i32)
+    local.get $p
+    i32.load8_u
+    local.tee $tmp
+    i32.eqz
+    br_if 0
+
+    i32.const 0
+    local.get $p
+    i32.store
+
+    i32.const 1
+    i32.const 0
+    i32.const 1
+    i32.const 0
+    call $fd_write
+    i32.const 0
+    i32.ne
+    if
+      i32.const 1
+      call $proc_exit
+    end
+
+    local.get $p
+    i32.const 1
+    i32.add
+    call $putstrz
+  )
+  (func (export "_start")
+    i32.const 0x100
+    call $putstrz
+  )
+  (memory (export "memory") 1)
+
+  ;; iov_base = 0, iov_len = 1
+  (data (i32.const 0) "\00\00\00\00\01\00\00\00")
+  (data (i32.const 0x100) "hello\n\00")
+)