Code cleanup.

includes/opcodes.h

@@ -4,7 +4,6 @@
 #include <string.h>
 #include <errno.h>
 #include <stdio.h>
-//#include "symbols_table.h"
 
 typedef enum {
     R1 = 0, R2, R3, R4, R5, R6, R7, R8 = 7
@@ -17,16 +16,9 @@ typedef enum {
     JMPI = 0xB8, JMP = 0x02, JZ = 0x03, JG = 0x04, JL = 0x05, NOP = 0x01, CALL = 0x06, RET = 0x07
 } Mnemonic;
 
-typedef struct {
-    Mnemonic Mnemonic;
-} Instruction;
-
-Instruction* CreateInstruction(Mnemonic mnemonic);
-void FreeInstruction(Instruction* instruction);
 int IsOpcode(const char*, Mnemonic*);
 int IsRegister(const char*, Registers*);
 void GetMnemonicText(Mnemonic mnemonic, char buffer[12]);
 void GetRegisterText(Registers reg, char buffer[3]);
-unsigned char GetInstructionMask(Mnemonic type);
 
 #endif

includes/parser.h

@@ -11,13 +11,6 @@
 #include "opcodes.h"
 #include "symbols_table.h"
 
-//#define HIGHMEMORY 65535 //64KiB - 1 AKA 0xFFFF
-
-typedef struct {
-    List* Instructions;
-    SymbolTable* SymbolsTable;
-} IRState;
-
-IRState* ParseTokens(List*);
+SymbolTable* ParseTokens(List* tokens);
 
 #endif

misc/another_test.asm

@@ -3,7 +3,7 @@
 .db MAX_LENGTH 32;MAX_MEM - MAX_LENGTH
 .db MSG "Hello, World!", 0
 
-_start:
+__start:
     copy r1, MSG ; Pointer into r1
     copy r8, VIDEO_MEM
     call strlen

src/main.c

@@ -8,6 +8,7 @@
 #include "../includes/scanner.h"
 #include "../includes/parser.h"
 
+const char* MagicStartName = "__start";
 List* LIST;
 SymbolTable* Symbols;
 
@@ -30,9 +31,7 @@ int main(int argc, char* args[]) {
 
     LIST = GenerateTokenList(source_code);
     
-    IRState* state = ParseTokens(LIST);
-
-    Symbols = state->SymbolsTable;
+    Symbols = ParseTokens(LIST);
 
     free(source_code);
 
@@ -125,8 +124,7 @@ unsigned short GetValueFromToken(Token* token) {
         Symbol* symbol;
 
         if (TryGetSymbol(token->Lemexe, Symbols, &symbol)) {
-            printf("Returning %d for address of %s.\n", symbol->Address, symbol->Name);
-            return 0xABCD;//symbol->Address;
+            return symbol->Address;
         } 
         else {
             fprintf(stderr, "Failed to find symbol %s while assembling.\n", token->Lemexe);

src/opcodes.c

@@ -44,26 +44,6 @@ struct _instruction instructions[31] = {
     //yld
 };
 
-Instruction* CreateInstruction(Mnemonic mnemonic) {
-    Instruction* instruction = calloc(1, sizeof(Instruction));
-
-    if (!instruction) {
-        fprintf(stderr, "Failed to calloc room for an Instruction. %s.\n", strerror(errno));
-
-        return NULL;
-    }
-
-    instruction->Mnemonic = mnemonic;
-
-    return instruction;
-}
-
-void FreeInstruction(Instruction* instruction) {
-    if (!instruction) return;
-
-    free(instruction);
-}
-
 void GetMnemonicText(Mnemonic mnemonic, char buffer[12]) {
     memset(buffer, '\0', 12);
 

src/parser.c

@@ -18,7 +18,6 @@ void AdvanceParser(void);
 void IgnoreParserLine(void);
 Token* PeekToken(void);
 int ParserAtEnd(void);
-IRState MachineState;
 
 void ExpectPuncuation(TokenPunctuation punctuation, ExpectOptions options);
 void ExpectRegister(void);
@@ -26,16 +25,17 @@ Symbol* ExpectIdentifier(int resolved, ExpectOptions options);
 void ExpectCharacterClass(Symbol* symbol);
 void ExpectLineEndOrFileEnd(ExpectOptions options);
 
+SymbolTable* SymbolsTable;
+
 //int HeapSize = 0;
 int PC = 0;
 
-IRState* ParseTokens(List* tokens) {
+SymbolTable* ParseTokens(List* tokens) {
     if (!tokens) return NULL;
 
     TokensList = tokens;
 
-    MachineState.SymbolsTable = CreateSymbolTable();
-    MachineState.Instructions = CreateList();
+    SymbolsTable = CreateSymbolTable();
 
     while(!ParserAtEnd()) {
         Token* t = PeekToken();
@@ -51,14 +51,14 @@ IRState* ParseTokens(List* tokens) {
             case LabelClass:
                 {
                     Symbol* symbol;
-                    int found = TryGetSymbol(t->Lemexe, MachineState.SymbolsTable, &symbol);
+                    int found = TryGetSymbol(t->Lemexe, SymbolsTable, &symbol);
 
                     if (found && symbol->Resolved) {
                         fprintf(stderr, "[Error] Line %d: Redefinition of symbol '%s'\n", t->LineNumber, t->Lemexe);
                         exit(1);
                     }
 
-                    if (!found) AddSymbolToTable(t->Lemexe, PC, 1, MachineState.SymbolsTable);
+                    if (!found) AddSymbolToTable(t->Lemexe, PC, 1, SymbolsTable);
                     else 
                     {
                         symbol->Address = PC;
@@ -80,7 +80,7 @@ IRState* ParseTokens(List* tokens) {
 
     PrintSymbols();
 
-    return &MachineState;
+    return SymbolsTable;
 }
 
 void HandleAssemblerDirective() {
@@ -407,7 +407,7 @@ Symbol* ExpectIdentifier(int resolved, ExpectOptions options) {
 
     Symbol* symbol;
 
-    int found = TryGetSymbol(token->Lemexe, MachineState.SymbolsTable, &symbol);
+    int found = TryGetSymbol(token->Lemexe, SymbolsTable, &symbol);
 
     if (found && symbol->Resolved && resolved) {
         fprintf(stderr, "[Line %d] Redefinition of symbol '%s'.\n", token->LineNumber, token->Lemexe);
@@ -418,7 +418,7 @@ Symbol* ExpectIdentifier(int resolved, ExpectOptions options) {
         symbol->Resolved = resolved || symbol->Resolved;
     }
     else {
-        symbol = AddSymbolToTable(token->Lemexe, PC, resolved, MachineState.SymbolsTable);
+        symbol = AddSymbolToTable(token->Lemexe, PC, resolved, SymbolsTable);
     }
 
     if (options & RemoveExpected) RemoveCurrentToken();
@@ -481,8 +481,8 @@ void ExpectLineEndOrFileEnd(ExpectOptions options) {
 void PrintSymbols(void) {
     //char mn[12];
     printf("-----SYMBOLS-----\n");
-    for(int i = 0; i < MachineState.SymbolsTable->Size; i++) {
-        Symbol* symbol = MachineState.SymbolsTable->Symbols[i];
+    for(int i = 0; i < SymbolsTable->Size; i++) {
+        Symbol* symbol = SymbolsTable->Symbols[i];
 
         printf("[%s] %s [%d] [Width: %d]", symbol->Resolved == 0 ? "Unresolved" : "Resolved", symbol->Name, symbol->Address, symbol->Length);