Added a distinction between constant numbers and what are effectively memory addresses (i.e. strings and labels).

includes/opcodes.h

@@ -4,7 +4,7 @@
 #include <string.h>
 #include "token.h"
 
-#define OPCODECOUNT 10
+#define OPCODECOUNT 11
 #define REGISTERCOUNT 8
 
 typedef struct {

includes/token.h

@@ -26,7 +26,7 @@ typedef enum {
     DB, ORG,
     //Opcodes
     COPY, ADD, SUB, JZ, INT, YLD, RET,
-    CMP, IN, OUT,
+    CMP, NOP, IN, OUT,
     //Registers
     R1, R2, R3, R4, R5, R6, R7, R8
 } TokenType;
@@ -34,9 +34,10 @@ typedef enum {
 typedef enum {
     None = 0,
     Reg = 1,
-    Immediate16 = 2,
-    Opcode = 4,
-    Directive = 8
+    Constant = 2,
+    Address = 4,
+    Opcode = 8,
+    Directive = 16
 } TokenClass;
 
 typedef struct {

src/opcodes.c

@@ -3,18 +3,45 @@
 #include <string.h>
 
 Instruction instructions[OPCODECOUNT] = {
-    { "copy", COPY, Reg, Reg | Immediate16 },
-    { "add", ADD, Reg, Reg | Immediate16 },
-    { "sub", SUB, Reg, Reg | Immediate16 },
-    { "jz", JZ, Immediate16, None },
-    { "int", INT, Immediate16, None },
+    { "copy", COPY, Reg | Address, Reg | Constant | Address },
+    { "add", ADD, Reg, Reg | Constant },
+    { "sub", SUB, Reg, Reg | Constant },
+    { "jz", JZ, Address, None },
+    { "int", INT, Constant, None },
     { "yld", YLD, None, None },
     { "ret", RET, None, None },
-    { "cmp", CMP, Reg | Immediate16, Reg | Immediate16 },
-    { "in", IN, None, None},
-    { "out", OUT, None, None}
+    { "cmp", CMP, Reg, Reg | Constant },
+    { "in", IN, Constant | Reg, None},
+    { "out", OUT, None, None},
+    { "nop", NOP, None, None}
 };
 
+/*
+    NOP  - 0000 0000
+    JZ   - 0000 0001 JZ Address
+    INT  - 0000 0010 INT Constant
+    YLD  - 0000 0011 YLD
+    RET  - 0000 0100 RET
+    CALL - 0000 0101 CALL Address
+    //IN reads from a port number specified by either a register or a constant.
+    IN   - 0000 0110 IN Constant
+         - 0000 0111 IN REG
+    COPY - 0000 1XXX COPY REG, REG
+         - 0001 0XXX COPY REG, Constant    
+         - 0010 0XXX COPY REG, Address
+         - 0010 1XXX COPY Address, REG
+         - 0011 0XXX COPY Address, Constant
+         - 0011 1XXX COPY Address, Address
+    ADD  - 0100 0XXX ADD REG, REG
+         - 0100 1XXX ADD REG, Constant
+    SUB  - 0101 0XXX SUB REG, REG
+         - 0101 1XXX SUB REG, Constant
+    CMP  - 0110 0XXX CMP REG, REG
+         - 0110 1XXX CMP REG, Constant
+         - 0111 0XXX CMP REG, Address
+    OUT  - 0111 1XXX OUT REG
+*/
+
 Register registers[REGISTERCOUNT] = {
     { "r1", R1 },
     { "r2", R2 },

src/parser.c

@@ -38,10 +38,13 @@ int ExpectTokenClass(int, ...);
 const Symbol* GetSymbol(char*);
 List* SymbolsTable;
 unsigned int ProgramCounter = 0;
+char Memory[HIGHMEMORY];
 
 void ParseTokens(List* tokens) {
     if (!tokens) return;
 
+    memset(Memory, 0, sizeof(Memory));
+
     TokensList = tokens;
 
     SymbolsTable = CreateList();
@@ -56,7 +59,7 @@ void ParseTokens(List* tokens) {
             case Opcode:
                 HandleOperation();
                 break;
-            case Immediate16:
+            case Address:
                 if (t->type == LABEL) {
                     printf("%s: \n", t->lexeme);
                     AddSymbol(t, ProgramCounter);
@@ -71,7 +74,12 @@ void ParseTokens(List* tokens) {
 
     PrintSymbols();
     DestroyList(SymbolsTable);
-    //printf("Program Counter: %d\n", ProgramCounter);
+    // for(int i = 0; i < 256; i++) { 
+    //     if (i != 0 && i % 80 == 0) printf("\n");
+    //     printf("%02X ", Memory[i] & 0xFF);
+    // }
+    // printf("\n");
+    // printf("Program Counter: %d\n", ProgramCounter);
     //printf("Heap Top: %#06X\n", HeapTop);
 }
 
@@ -93,6 +101,10 @@ void HandleAssemblerDirective(void) {
             case STRING:
                 printf("[INFO] %s = '%s' (%#04X)\n", identifier->lexeme, PeekToken()->lexeme, ProgramCounter);
 
+                for(int i = 0; i < strlen(PeekToken()->lexeme); i++) {
+                    Memory[ProgramCounter + i] = PeekToken()->lexeme[i];
+                }
+
                 ProgramCounter += strlen(PeekToken()->lexeme);
 
                 AdvanceParser();
@@ -106,6 +118,7 @@ void HandleAssemblerDirective(void) {
                     }
                     else {
                         //Add the NULL byte.
+                        Memory[ProgramCounter] = '\0';
                         ProgramCounter++;
                         return;
                     }
@@ -142,7 +155,7 @@ void HandleOperation(void) {
             //Encode the register number here.
             printf("%s ", PeekToken()->lexeme);
         }
-        else if (inst->parameter_one & Immediate16) {
+        else if (inst->parameter_one & Address || inst->parameter_one & Constant) {
             if (PeekToken()->type == IDENTIFIER || PeekToken()->type == LABEL) {
                 const Symbol* symbol = GetSymbol(PeekToken()->lexeme);
 
@@ -176,7 +189,7 @@ void HandleOperation(void) {
 
     if (inst->parameter_two && PeekToken()->token_class > 0) {
         //printf("Matched 2 '%s'\n", PeekToken()->lexeme);
-        if (inst->parameter_two & Immediate16) {
+        if (inst->parameter_two & Address || inst->parameter_two & Constant) {
             if (PeekToken()->type == IDENTIFIER || PeekToken()->type == LABEL) {
                 const Symbol* symbol = GetSymbol(PeekToken()->lexeme);
 

src/token.c

@@ -28,8 +28,9 @@ TokenClass GetTokenClass(TokenType type) {
         case STRING:
         case IDENTIFIER:
         case LABEL:
+            return Address;
         case NUMBER:
-            return Immediate16;
+            return Constant;
         default:
             return None;
     }