Add jump instructions

hal/instructions.go

@@ -45,6 +45,9 @@ var instructions = []*Instruction{
 	InstructionLoadNum,
 	InstructionStore,
 	InstructionJumpNeg,
+	InstructionJumpPos,
+	InstructionJumpNull,
+	InstructionJump,
 	InstructionAddnum,
 }
 
@@ -121,20 +124,38 @@ var InstructionStore = &Instruction{
 	},
 }
 
-var InstructionJumpNeg = &Instruction{
-	Name: "JUMPNEG",
-	ExecuteWithOperand: func(module *Module, operand float64) error {
-		index := int64(operand)
-		if _, ok := module.programStorage[index]; !ok {
-			return fmt.Errorf("index %d does not exist in program storage", index)
-		}
-		if module.accumulator < 0 {
-			return module.setProgramCounter(index)
-		}
-		return nil
-	},
+func newJumpInstruction(name string, doJump func(accumulator float64) bool) *Instruction {
+	return &Instruction{
+		Name: "JUMPPOS",
+		ExecuteWithOperand: func(module *Module, operand float64) error {
+			index := int64(operand)
+			if _, ok := module.programStorage[index]; !ok {
+				return fmt.Errorf("index %d does not exist in program storage", index)
+			}
+			if doJump(module.accumulator) {
+				return module.setProgramCounter(index)
+			}
+			return nil
+		},
+	}
 }
 
+var InstructionJumpNeg = newJumpInstruction("JUMPNEG", func(accumulator float64) bool {
+	return accumulator > 0
+})
+
+var InstructionJumpPos = newJumpInstruction("JUMPPOS", func(accumulator float64) bool {
+	return accumulator < 0
+})
+
+var InstructionJumpNull = newJumpInstruction("JUMPNULL", func(accumulator float64) bool {
+	return accumulator == 0
+})
+
+var InstructionJump = newJumpInstruction("JUMP", func(accumulator float64) bool {
+	return true
+})
+
 var InstructionAddnum = &Instruction{
 	Name: "ADDNUM",
 	ExecuteWithOperand: func(module *Module, operand float64) {