Add JS test for max instructions

js/test/js.test.ts

@@ -335,3 +335,17 @@ describe('Native syscall handlers', () => {
 		expect(called).toBe(false);
 	});
 });
+
+describe('Respect max instructions to execute', () => {
+	it('should stop execution when max instructions are reached', async () => {
+		let axecutor = new Axecutor(exitX86Code, 0x1000n, 0x1000n);
+		axecutor.set_max_instructions(1n);
+
+		axecutor.reg_write_64(Register.RDI, 0n);
+
+		await expect(axecutor.execute()).rejects.toThrow();
+
+		// The mov rdi, ... instruction must not be executed
+		expect(axecutor.reg_read_64(Register.RDI)).toBe(0n);
+	});
+});

src/state/execute.rs

@@ -173,6 +173,8 @@ impl Axecutor {
 
     /// Sets an upper limit on the number of instructions that can be executed.
     pub fn set_max_instructions(&mut self, max: u64) {
+        debug_log!("Setting max instructions to {}", max);
+
         self.state.max_instructions = Some(max);
     }
 }