✅ another test

.gitignore

@@ -1,2 +1,3 @@
+/luac.out
 /target
 /untracked

src/main.rs

@@ -1,7 +1,14 @@
 use std::collections::BTreeMap;
 
+#[derive (Debug)]
 enum Instruction {
-	VarArgPrep (i32),
+	Add (u8, u8, u8),
+	
+	Call (u8, u8, u8),
+	Closure (u8, i32),
+	
+	// Equals Constant?
+	EqK (u8, u8, u8),
 	
 	// Get Table, Upvalue
 	GetTabUp (u8, u8, u8),
@@ -9,9 +16,6 @@ enum Instruction {
 	// Get Immediate?
 	GetI (u8, u8, u8),
 	
-	// Equals Constant?
-	EqK (u8, u8, u8),
-	
 	// Jump
 	Jmp (i32),
 	
@@ -21,12 +25,15 @@ enum Instruction {
 	// Load Constant
 	LoadK (u8, i32),
 	
+	// MetaMethod, Binary
+	MmBin (u8, u8, u8),
 	
-	Call (u8, u8, u8),
-	Closure (u8, i32),
+	Move (u8, u8),
 	
 	// (A, B, _C) Return B - 1 registers starting with  A
 	Return (u8, u8, u8),
+	
+	VarArgPrep (i32),
 }
 
 #[derive (Clone, Debug, PartialEq)]
@@ -35,7 +42,6 @@ enum Value {
 	False,
 	True,
 	Float (f64),
-	Integer (i64),
 	String (String),
 	
 	// These are all bogus, I haven't figured out how to implement
@@ -66,7 +72,22 @@ impl From <&str> for Value {
 
 impl From <i32> for Value {
 	fn from (x: i32) -> Self {
-		Self::Integer (x as i64)
+		Self::Float (f64::try_from (x).unwrap ())
+	}
+}
+
+impl From <f64> for Value {
+	fn from (x: f64) -> Self {
+		Self::Float (x)
+	}
+}
+
+impl Value {
+	fn as_float (&self) -> Option <f64> {
+		match self {
+			Self::Float (x) => Some (*x),
+			_ => None,
+		}
 	}
 }
 
@@ -92,6 +113,20 @@ impl Default for VirtualMachine {
 }
 
 impl VirtualMachine {
+	fn upvalues_from_args <I: Iterator <Item = String>> (args: I) -> Vec <Value>
+	{
+		let arg = args.map (|s| s.to_string ()).collect ();
+		
+		let env = BTreeMap::from_iter ([
+			("arg", Value::BogusArg (arg)),
+			("print", Value::BogusPrint),
+		].map (|(k, v)| (k.to_string (), v)).into_iter ());
+		
+		vec! [
+			Value::BogusEnv (env),
+		]
+	}
+	
 	fn execute_chunk (&mut self, chunk: &Chunk, upvalues: &Vec <Value>) 
 	-> Vec <Value> {
 		let max_iters = 2000;
@@ -103,6 +138,16 @@ impl VirtualMachine {
 			let k = &chunk.constants;
 			
 			match instruction {
+				Instruction::Add (a, b, c) => {
+					let a = usize::try_from (*a).unwrap ();
+					let b = usize::try_from (*b).unwrap ();
+					let c = usize::try_from (*c).unwrap ();
+					
+					let v_b = r [b].as_float ().unwrap ();
+					let v_c = r [c].as_float ().unwrap ();
+					
+					r [a] = (v_b + v_c).into ();
+				},
 				Instruction::Call (a, b, c) => {
 					// Take arguments from registers [a + 1, a + b)
 					// Call the function in register [a]
@@ -112,14 +157,15 @@ impl VirtualMachine {
 					// 
 					// e.g. CALL 0 2 1 mean "Call 0 with 1 argument, return 1 value", like for printing a constant
 					
-					// TODO: Only implement printing constants for now
+					// TODO: Only implement printing values for now
 					
 					let a = usize::try_from (*a).unwrap ();
 					
+					assert_eq! (r.get (a).unwrap (), &Value::BogusPrint);
 					assert_eq! (*b, 2);
 					assert_eq! (*c, 1);
 					
-					println! ("{:?}", r [a + 1]);
+					println! ("{:?}", r.get (a + 1).unwrap ());
 				},
 				Instruction::EqK (a, b, c_k) => {
 					let a = usize::try_from (*a).unwrap ();
@@ -178,6 +224,26 @@ impl VirtualMachine {
 					
 					r [a] = k [bx].clone ();
 				},
+				Instruction::MmBin (a, b, c) => {
+					let a = usize::try_from (*a).unwrap ();
+					let b = usize::try_from (*b).unwrap ();
+					
+					let a = &r [a];
+					let b = &r [b];
+					
+					if a.as_float().is_some() && b.as_float().is_some () {
+						// No need for metamethods
+					}
+					else {
+						panic! ("Not sure how to implememtn OP_MMBIN for these 2 values {a:?}, {b:?}");
+					}
+				},
+				Instruction::Move (a, b) => {
+					let a = usize::try_from (*a).unwrap ();
+					let b = usize::try_from (*b).unwrap ();
+					
+					r [a] = r [b].clone ();
+				},
 				Instruction::Return (a, b, _c) => {
 					let a = usize::try_from (*a).unwrap ();
 					let b = usize::try_from (*b).unwrap ();
@@ -185,7 +251,7 @@ impl VirtualMachine {
 					return self.registers [a..(a + b - 1)].to_vec();
 				},
 				Instruction::VarArgPrep (_) => (),
-				_ => (),
+				x => panic! ("Unimplemented instruction {x:?}"),
 			}
 			
 			self.program_counter += 1;
@@ -196,45 +262,26 @@ impl VirtualMachine {
 }
 
 fn main() {
-	let arg: Vec <_> = std::env::args ().collect ();
-	
 	let chunk = Chunk {
 		instructions: vec! [
 			Instruction::VarArgPrep (0),
-			Instruction::GetTabUp (1, 0, 0),
-			Instruction::GetI (1, 1, 1),
-			Instruction::EqK (1, 1, 0),
-			Instruction::Jmp (6),
-			Instruction::GetTabUp (1, 0, 2),
-			Instruction::LoadK (2, 3),
-			Instruction::Call (1, 2, 1),
-			Instruction::LoadI (1, 0),
-			Instruction::Return (1, 2, 1),
-			Instruction::Jmp (5),
-			Instruction::GetTabUp (1, 0, 2),
-			Instruction::LoadK (2, 4),
-			Instruction::Call (1, 2, 1),
-			Instruction::LoadI (1, 1),
-			Instruction::Return (1, 2, 1),
-			Instruction::Return (1, 1, 1),
+			Instruction::LoadK (0, 0),
+			Instruction::LoadI (1, 3),
+			Instruction::Add (2, 0, 1),
+			Instruction::MmBin (0, 1, 6),
+			Instruction::GetTabUp (3, 0, 1),
+			Instruction::Move (4, 2),
+			Instruction::Call (3, 2, 1),
+			Instruction::Return (2, 2, 1),
+			Instruction::Return (3, 1, 1),
 		],
 		constants: vec! [
-			"arg",
-			"93",
-			"print",
-			"it's 93",
-			"it's not 93",
-		].into_iter ().map (|s| Value::from (s)).collect (),
+			0.5.into (),
+			"print".into (),
+		],
 	};
 	
-	let env = BTreeMap::from_iter ([
-		("arg", Value::BogusArg (arg.clone ())),
-		("print", Value::BogusPrint),
-	].map (|(k, v)| (k.to_string (), v)).into_iter ());
-	
-	let upvalues = vec! [
-		Value::BogusEnv (env),
-	];
+	let upvalues = VirtualMachine::upvalues_from_args (std::env::args ());
 	
 	let mut vm = VirtualMachine::default ();
 	println! ("Returned: {:?}", vm.execute_chunk (&chunk, &upvalues));
@@ -244,6 +291,48 @@ fn main() {
 mod tests {
 	use super::*;
 	
+	#[test]
+	fn floats () {
+		/*
+		local a = 0.5
+		local b = 3
+
+		local x = a + b
+
+		print (x)
+		return x
+		*/
+		
+		let chunk = Chunk {
+			instructions: vec! [
+				Instruction::VarArgPrep (0),
+				Instruction::LoadK (0, 0),
+				Instruction::LoadI (1, 3),
+				Instruction::Add (2, 0, 1),
+				Instruction::MmBin (0, 1, 6),
+				Instruction::GetTabUp (3, 0, 1),
+				Instruction::Move (4, 2),
+				Instruction::Call (3, 2, 1),
+				Instruction::Return (2, 2, 1),
+				Instruction::Return (3, 1, 1),
+			],
+			constants: vec! [
+				0.5.into (),
+				"print".into (),
+			],
+		};
+		
+		for (arg, expected) in [
+			(vec! ["_exe_name"], vec! [3.5.into ()]),
+		] {
+			let mut vm = VirtualMachine::default ();
+			let upvalues = VirtualMachine::upvalues_from_args (arg.into_iter ().map (|s| s.to_string ()));
+			let actual = vm.execute_chunk (&chunk, &upvalues);
+			
+			assert_eq! (actual, expected);
+		}
+	}
+	
 	#[test]
 	fn is_93 () {
 		/*
@@ -290,18 +379,8 @@ mod tests {
 			(vec! ["_exe_name", "93"], vec! [0.into ()]),
 			(vec! ["_exe_name", "94"], vec! [1.into ()]),
 		] {
-			let arg = arg.into_iter ().map (|s| s.to_string ()).collect ();
-			
-			let env = BTreeMap::from_iter ([
-				("arg", Value::BogusArg (arg)),
-				("print", Value::BogusPrint),
-			].map (|(k, v)| (k.to_string (), v)).into_iter ());
-			
-			let upvalues = vec! [
-				Value::BogusEnv (env),
-			];
-			
 			let mut vm = VirtualMachine::default ();
+			let upvalues = VirtualMachine::upvalues_from_args (arg.into_iter ().map (|s| s.to_string ()));
 			let actual = vm.execute_chunk (&chunk, &upvalues);
 			
 			assert_eq! (actual, expected);

test_vectors/floats.lua

@@ -0,0 +1,7 @@
+local a = 0.5
+local b = 3
+
+local x = a + b
+
+print (x)
+return x