From 1acfabe2e763c0e8edef113a3fe16d563365e9b0 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Wed, 25 Mar 2026 22:44:43 +0300
Subject: [PATCH] examples: update wasm_codegen for current wasmer (fixes
 #22607)

---
 examples/wasm_codegen/add.v       | 13 ------
 examples/wasm_codegen/factorial.v | 33 --------------
 examples/wasm_codegen/functions.v | 29 -------------
 examples/wasm_codegen/main.v      | 71 +++++++++++++++++++++++++++++++
 4 files changed, 71 insertions(+), 75 deletions(-)
 delete mode 100644 examples/wasm_codegen/add.v
 delete mode 100644 examples/wasm_codegen/factorial.v
 delete mode 100644 examples/wasm_codegen/functions.v
 create mode 100644 examples/wasm_codegen/main.v

diff --git a/examples/wasm_codegen/add.v b/examples/wasm_codegen/add.v
deleted file mode 100644
index 09e2ae429..000000000
--- a/examples/wasm_codegen/add.v
+++ /dev/null
@@ -1,13 +0,0 @@
-import wasm
-
-fn main() {
-	mut m := wasm.Module{}
-	mut func := m.new_function('add', [.i32_t, .i32_t], [.i32_t])
-	{
-		func.local_get(0)
-		func.local_get(1)
-		func.add(.i32_t)
-	}
-	m.commit(func, true) // `export: true`
-	print(m.compile().bytestr())
-}
diff --git a/examples/wasm_codegen/factorial.v b/examples/wasm_codegen/factorial.v
deleted file mode 100644
index 41c3c372e..000000000
--- a/examples/wasm_codegen/factorial.v
+++ /dev/null
@@ -1,33 +0,0 @@
-import wasm
-
-fn main() {
-	mut m := wasm.Module{}
-	mut fac := m.new_function('fac', [.i64_t], [.i64_t])
-	{
-		fac.local_get(0)
-		fac.eqz(.i64_t)
-		bif := fac.c_if([], [.i64_t])
-		{
-			fac.i64_const(1)
-		}
-		fac.c_else(bif)
-		{
-			{
-				fac.local_get(0)
-			}
-			{
-				fac.local_get(0)
-				fac.i64_const(1)
-				fac.sub(.i64_t)
-				fac.call('fac')
-			}
-			fac.mul(.i64_t)
-		}
-		fac.c_end(bif)
-	}
-	m.commit(fac, true)
-	print(m.compile().bytestr())
-
-	// v run factorial.v > a.wasm
-	// wasmer a.wasm -i fac 5
-}
diff --git a/examples/wasm_codegen/functions.v b/examples/wasm_codegen/functions.v
deleted file mode 100644
index 478040fe8..000000000
--- a/examples/wasm_codegen/functions.v
+++ /dev/null
@@ -1,29 +0,0 @@
-import wasm
-
-fn main() {
-	mut m := wasm.Module{}
-	mut pyth := m.new_function('pythagoras', [.f32_t, .f32_t], [
-		.f32_t,
-	])
-	{
-		pyth.local_get(0)
-		pyth.local_get(0)
-		pyth.mul(.f32_t)
-		pyth.local_get(1)
-		pyth.local_get(1)
-		pyth.mul(.f32_t)
-		pyth.add(.f32_t)
-		pyth.sqrt(.f32_t)
-		pyth.cast(.f32_t, true, .f64_t)
-	}
-	m.commit(pyth, true)
-	mut test := m.new_function('test', [.f32_t], [.f64_t])
-	{
-		test.local_get(0)
-		test.f32_const(10.0)
-		test.call('pythagoras')
-		test.cast(.f32_t, true, .f64_t)
-	}
-	m.commit(test, true)
-	print(m.compile().bytestr())
-}
diff --git a/examples/wasm_codegen/main.v b/examples/wasm_codegen/main.v
new file mode 100644
index 000000000..0808be492
--- /dev/null
+++ b/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())!
+}
-- 
2.39.5