wasm module: globals, constant expressions and function reference types (#17950)

vlib/wasm/tests/var_test.v

@@ -0,0 +1,55 @@
+import wasm
+import os
+
+const exe = os.find_abs_path_of_executable('wasm-validate') or { exit(0) }
+
+fn validate(mod []u8) ! {
+	mut proc := os.new_process(exe)
+	proc.set_args(['-'])
+	proc.set_redirect_stdio()
+	proc.run()
+	{
+		os.fd_write(proc.stdio_fd[0], mod.bytestr())
+		os.fd_close(proc.stdio_fd[0])
+	}
+	proc.wait()
+	if proc.status != .exited {
+		return error('wasm-validate exited abormally')
+	}
+	if proc.code != 0 {
+		return error('wasm-validate exited with a non zero exit code')
+	}
+	proc.close()
+}
+
+fn test_globals() {
+	mut m := wasm.Module{}
+
+	vsp := m.new_global('__vsp', .i32_t, true, wasm.constexpr_value(10))
+	mut func := m.new_function('vsp', [], [.i32_t])
+	{
+		func.global_get(vsp)
+		func.i32_const(20)
+		func.add(.i32_t)
+		func.global_set(vsp)
+		func.global_get(vsp)
+	}
+	m.commit(func, true)
+
+	fref := m.new_global('__ref', .funcref_t, true, wasm.constexpr_ref_null(.funcref_t))
+	mut func1 := m.new_function('ref', [], [])
+	{
+		func1.ref_func('vsp')
+		func1.global_set(fref)
+	}
+	m.commit(func1, true)
+
+	gimport := m.new_global_import('env', '__import', .f64_t, false)
+	mut func2 := m.new_function('import', [], [.f64_t])
+	{
+		func2.global_get(gimport)
+	}
+	m.commit(func2, true)
+
+	validate(m.compile()) or { panic(err) }
+}