Add checks for stack overflow/underflow

Author: coderick14

ALU/ALU.go

@@ -5,25 +5,21 @@ func Adder(val1, val2 int64) int64 {
 	return val1 + val2
 }
 
-
 //Function to perform logical AND operation of two int64 numbers.
 func LogicalAND(val1, val2 int64) int64 {
 	return val1 & val2
 }
 
-
 //Function to perform logical OR operation of two int64 numbers.
 func LogicalOR(val1, val2 int64) int64 {
 	return val1 | val2
 }
 
-
 //Function to perform logical XOR operation of two int64 numbers.
 func LogicalXOR(val1, val2 int64) int64 {
 	return val1 ^ val2
 }
 
-
 //Function to perform unsigned addition of two uint64 numbers.
 //Used only for setting Carry flag.
 func UnsignedAdder(val1, val2 uint64) uint64 {

Memory/Constants.go

@@ -1,8 +1,19 @@
 package memory
 
+// Program counter increment value
 const INCREMENT = 1
+
+// Data memory size in number of words
 const MEMORY_SIZE = 4096
+
+// Stack size in number of words
 const STACK_SIZE = 256
+
+// XZR register number
 const XZR = 31
+
+// Stack pointer register number
 const SP = 28
-const LR = 30
+
+// Link register number
+const LR = 30

Memory/DataMemory.go

@@ -18,21 +18,21 @@ var registers, buffer [32]int64
 
 var flagNegative, flagZero, flagOverflow, flagCarry bool
 
-// method to initiate register values.
+// InitRegisters is a function to initiate register values.
 func InitRegisters() {
 	registers[XZR] = 0
 	registers[SP] = MEMORY_SIZE * 4
 }
 
-// function to store register values in a buffer.
+// SaveRegisters is a function to store register values in a buffer.
 func SaveRegisters() {
 	var i int
 	for i = 0; i < 32; i++ {
 		buffer[i] = registers[i]
 	}
 }
 
-// function to pretty print register values to terminal.
+// ShowRegisters is a function to pretty print register values to terminal.
 func ShowRegisters(showAll bool) {
 	var i int
 	var hasUpdated bool = false