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Made use of the Symbols Table, and started the proccess of determining the memory location of opcodes and variables.

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glm94
2022-08-25 19:06:05 +00:00
parent 64326937b1
commit 4f6d5f652e
2 changed files with 72 additions and 101 deletions
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src/parser.c
+60 -89
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@@ -15,7 +15,13 @@ typedef struct {
int address;
} Symbol;
Symbol* CreateSymbol(Token*, int);
struct intr {
TokenType struction;
unsigned int parameter1;
unsigned int parameter2;
};
Symbol* CreateSymbol(Token* token, int address);
const List* TokensList;
int CurrentToken = 0;
//int HeapTop = HIGHMEMORY;
@@ -29,7 +35,7 @@ Token* PeekToken(void);
int ParserAtEnd(void);
int Expect(int, ...);
int ExpectTokenClass(int, ...);
Token* GetSymbol(char*);
const Symbol* GetSymbol(char*);
List* SymbolsTable;
unsigned int ProgramCounter = 0;
@@ -46,41 +52,20 @@ void ParseTokens(List* tokens) {
switch(t->token_class) {
case Directive:
HandleAssemblerDirective();
break;
case Opcode:
ProgramCounter++;
HandleOperation();
break;
case Immediate16:
ProgramCounter++;
AddSymbol(t, ProgramCounter);
break;
default:
break;
}
AdvanceParser();
// switch(t->type) {
// case IDENTIFIER:
// case LABEL:
// AddSymbol(t, ProgramCounter);
// AdvanceParser();
// break;
// // case STRING:
// // ProgramCounter += strlen(t->lexeme);
// // break;
// //case NUMBER: //Number's will be 2 bytes
// // ProgramCounter += 2;
// // break;
// default: //Instructions are 1 byte wide.
// if (t->token_class == Opcode) {
// //printf("One: %s\n", t->lexeme);
// ProgramCounter++;
// HandleOperation();
// }
// else if (t->token_class == Directive) {
// HandleAssemblerDirective();
// }
// AdvanceParser();
// break;
// }
}
PrintSymbols();
@@ -131,41 +116,6 @@ void HandleAssemblerDirective(void) {
exit(1);
}
}
// if (token->type == DB) {
// token = PeekToken();
// if (!Expect(1, IDENTIFIER)) {
// fprintf(stderr, "Expected identifier on line %d\n", PeekToken()->line);
// exit(1);
// }
// //This should be done only after the directive is parsed fully.
// //AddSymbol(token, HEAPTOP);
// if (PeekToken()-> type == STRING) {
// AddSymbol(token, ProgramCounter);
// ProgramCounter += strlen(PeekToken()->lexeme);
// AdvanceParser();
// if (PeekToken()-> type == COMMA) {
// AdvanceParser();
// if (PeekToken()-> type != NUMBER) {
// fprintf(stderr, "Expected string termination byte on line %d\n", PeekToken()->line);
// exit(1);
// }
// else {
// //Add the NULL byte.
// ProgramCounter++;
// return;
// }
// }
// }
// else {
// AddSymbol(token, ProgramCounter);
// }
// }
}
void HandleOperation(void) {
@@ -175,23 +125,43 @@ void HandleOperation(void) {
AdvanceParser();
if (inst->parameter_one == None) return;
printf("[%#05X] %s ", ProgramCounter, inst->lexeme);
if (inst->parameter_one == None) {
printf("\n");
return;
}
if (inst->parameter_one && PeekToken()->token_class > 0) {
//printf("Matched '%s'\n", PeekToken()->lexeme);
if (inst->parameter_one == Reg) {
if (inst->parameter_one & Reg) {
//Encode the register number here.
printf("%s ", PeekToken()->lexeme);
}
else if (inst->parameter_one & Immediate16) {
if (PeekToken()->type == IDENTIFIER || PeekToken()->type == LABEL) {
const Symbol* symbol = GetSymbol(PeekToken()->lexeme);
if (!symbol) {
fprintf(stderr, "[Error] %s is undefined.\n", PeekToken()->lexeme);
exit(1);
}
printf("[%s@%#04X] ", PeekToken()->lexeme, symbol->address);
}
else if (PeekToken()->type == NUMBER) printf("%s ", PeekToken()->lexeme);
else if (inst->parameter_one == Immediate16) {
ProgramCounter += 2;
}
AdvanceParser();
}
if (inst->parameter_two == None) return;
if (inst->parameter_two == None) {
printf("\n");
return;
}
if (PeekToken()->type == COMMA) {
AdvanceParser();
@@ -203,7 +173,19 @@ void HandleOperation(void) {
if (inst->parameter_two && PeekToken()->token_class > 0) {
//printf("Matched 2 '%s'\n", PeekToken()->lexeme);
if (inst->parameter_one == Immediate16) {
if (inst->parameter_two & Immediate16) {
if (PeekToken()->type == IDENTIFIER || PeekToken()->type == LABEL) {
const Symbol* symbol = GetSymbol(PeekToken()->lexeme);
if (!symbol) {
fprintf(stderr, "[Error] %s is undefined.\n", PeekToken()->lexeme);
exit(1);
}
printf("[%s@%#04X] ", PeekToken()->lexeme, symbol->address);
}
else if (PeekToken()->type == NUMBER) printf("%s ", PeekToken()->lexeme);
ProgramCounter += 2;
}
@@ -212,6 +194,8 @@ void HandleOperation(void) {
printf("Failed to match %s (class: %d)\n", PeekToken()->lexeme, PeekToken()->token_class);
printf("Inst %s (class: %x)\n", inst->lexeme, inst->parameter_two);
}
printf("\n");
}
int ExpectTokenClass(int count, ...) {
@@ -252,25 +236,6 @@ int Expect(int count, ...) {
return 0;
}
int Require(int count, ...) {
va_list tokenTypes;
Token* token = PeekToken();
va_start(tokenTypes, count);
for(int i = 0; i < count; i++) {
if (va_arg(tokenTypes, TokenType) == token->type) {
va_end(tokenTypes);
AdvanceParser();
return 1;
}
}
va_end(tokenTypes);
return 0;
}
void PrintSymbols(void) {
printf("-----SYMBOLS-----\n");
for(int i = 0; i < SymbolsTable->size; i++) {
@@ -295,9 +260,15 @@ void AddSymbol(Token* token, int address) {
AddListItem(symbol, sizeof(Symbol), SymbolsTable);
}
Token* GetSymbol(char* name) {
const Symbol* GetSymbol(char* name) {
if (!name) return NULL;
for(int i = 0; i < SymbolsTable->size; i++) {
const Symbol* s = SymbolsTable->content[i];
if (strcmp(s->token->lexeme, name) == 0) return s;
}
return NULL;
}