Initial project import

tools/v/examples/wasm_codegen/main.v

@@ -0,0 +1,71 @@
+import os
+import wasm
+
+// Install Wasmer:
+// $ curl https://get.wasmer.io -sSfL | sh
+// $ wasmer --version
+//
+// Create `examples/wasm_codegen/math.wasm`:
+// $ v run examples/wasm_codegen/main.v
+//
+// Call entrypoints with the current Wasmer CLI:
+// $ wasmer run examples/wasm_codegen/math.wasm --invoke add 3 5
+// 8
+// $ wasmer run examples/wasm_codegen/math.wasm --invoke factorial 10
+// 3628800
+// $ wasmer run examples/wasm_codegen/math.wasm --invoke pythagoras 30 40
+// 50
+fn main() {
+	mut math := Math{}
+	math.function_add('add')
+	math.function_factorial('factorial')
+	math.function_pythagoras('pythagoras')
+	math.save(os.join_path(@DIR, 'math.wasm'))!
+}
+
+struct Math {
+	wasm.Module
+}
+
+fn (mut math Math) function_add(name string) {
+	mut func := math.new_function(name, [.i32_t, .i32_t], [.i32_t])
+	func.local_get(0)
+	func.local_get(1)
+	func.add(.i32_t)
+	math.commit(func, true)
+}
+
+fn (mut math Math) function_factorial(name string) {
+	mut func := math.new_function(name, [.i64_t], [.i64_t])
+	func.local_get(0)
+	func.eqz(.i64_t)
+	block := func.c_if([], [.i64_t])
+	func.i64_const(1)
+	func.c_else(block)
+	func.local_get(0)
+	func.local_get(0)
+	func.i64_const(1)
+	func.sub(.i64_t)
+	func.call(name)
+	func.mul(.i64_t)
+	func.c_end(block)
+	math.commit(func, true)
+}
+
+fn (mut math Math) function_pythagoras(name string) {
+	mut func := math.new_function(name, [.f32_t, .f32_t], [.f64_t])
+	func.local_get(0)
+	func.local_get(0)
+	func.mul(.f32_t)
+	func.local_get(1)
+	func.local_get(1)
+	func.mul(.f32_t)
+	func.add(.f32_t)
+	func.sqrt(.f32_t)
+	func.cast(.f32_t, true, .f64_t)
+	math.commit(func, true)
+}
+
+fn (mut math Math) save(path string) ! {
+	os.write_file_array(path, math.compile())!
+}