glm94/assm-test
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Updated the way symbols are represented and how they are marked as resolved.

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glm94
2023-07-09 22:04:55 -05:00
parent 9c8fe17c8f
commit 65383cded2
6 changed files with 82 additions and 45 deletions
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includes/parser.h
+1 -1
View File
@@ -11,6 +11,6 @@
#include "opcodes.h"
#include "symbols_table.h"
SymbolTable* ParseTokens(List* tokens);
void ParseTokens(List* tokens, SymbolTable** symbolsTable);
#endif
includes/symbols_table.h
+16 -4
View File
@@ -12,12 +12,23 @@
#define SYMBOLSTABLE_DEFAULT_CAPACITY 128
typedef struct {
typedef enum {
RefUnknown,
RefLiteral,
RefExpression,
RefPointer
} ReferenceType;
typedef struct _symbol {
char* Name;
int Address;
int Resolved;
int Length;
Token* References;
union {
Token* Mnemonic;
struct _symbol* Symbol;
unsigned short Number;
} Value;
ReferenceType Type;
} Symbol;
typedef struct {
@@ -28,8 +39,9 @@ typedef struct {
SymbolTable* CreateSymbolTable(void);
int TryGetSymbol(char* name, SymbolTable* table, Symbol** outSymbol);
Symbol* AddSymbolToTable(char* name, int address, int resolved, SymbolTable* table);
Symbol* AddSymbolToTable(char* name, int address, SymbolTable* table);
void FreeSymbolTable(SymbolTable* table);
void FreeSymbol(Symbol* symbol);
int SymbolResolved(Symbol* symbol);
#endif
misc/another_test.asm
+1 -1
View File
@@ -1,6 +1,6 @@
.db MAX_MEM 0xFFFF
.db VIDEO_MEM 0xF37F
.db MAX_LENGTH 32;MAX_MEM - MAX_LENGTH
.db MAX_LENGTH MAX_MEM; - MAX_LENGTH
.db MSG "Hello, World!", 0
__start:
src/main.c
+2 -2
View File
@@ -10,7 +10,7 @@
const char* MagicStartName = "__start";
List* LIST;
SymbolTable* Symbols;
SymbolTable* Symbols = NULL;
unsigned char mem[128] = {0};
void print(void);
@@ -31,7 +31,7 @@ int main(int argc, char* args[]) {
LIST = GenerateTokenList(source_code);
Symbols = ParseTokens(LIST);
ParseTokens(LIST, &Symbols);
free(source_code);
src/parser.c
+43 -33
View File
@@ -21,7 +21,7 @@ int ParserAtEnd(void);
void ExpectPuncuation(TokenPunctuation punctuation, ExpectOptions options);
void ExpectRegister(void);
Symbol* ExpectIdentifier(int resolved, ExpectOptions options);
Symbol* ExpectIdentifier(ExpectOptions options, int expectUnresolved);
void ExpectCharacterClass(Symbol* symbol);
void ExpectLineEndOrFileEnd(ExpectOptions options);
@@ -30,12 +30,15 @@ SymbolTable* SymbolsTable;
//int HeapSize = 0;
int PC = 0;
SymbolTable* ParseTokens(List* tokens) {
if (!tokens) return NULL;
void ParseTokens(List* tokens, SymbolTable** symbols) {
if (!tokens) return;
if (!symbols) return;
TokensList = tokens;
SymbolsTable = CreateSymbolTable();
if (!*symbols) *symbols = CreateSymbolTable();
SymbolsTable = *symbols;
while(!ParserAtEnd()) {
Token* t = PeekToken();
@@ -53,23 +56,23 @@ SymbolTable* ParseTokens(List* tokens) {
Symbol* symbol;
int found = TryGetSymbol(t->Lemexe, SymbolsTable, &symbol);
if (found && symbol->Resolved) {
if (found && SymbolResolved(symbol)) {
fprintf(stderr, "[Error] Line %d: Redefinition of symbol '%s'\n", t->LineNumber, t->Lemexe);
exit(1);
}
if (!found) symbol = AddSymbolToTable(t->Lemexe, PC, 1, SymbolsTable);
else
{
if (!found) symbol = AddSymbolToTable(t->Lemexe, PC, SymbolsTable);
// else
// {
symbol->Address = PC;
symbol->Resolved = 1;
}
symbol->Type = RefPointer;
//}
RemoveCurrentToken(); //label
ExpectLineEndOrFileEnd(RemoveExpected);
symbol->References = ExpectMnemonic();
symbol->Value.Mnemonic = ExpectMnemonic();
}
break;
default:
@@ -81,8 +84,6 @@ SymbolTable* ParseTokens(List* tokens) {
}
PrintSymbols();
return SymbolsTable;
}
void HandleAssemblerDirective() {
@@ -93,10 +94,12 @@ void HandleAssemblerDirective() {
{
RemoveCurrentToken();
Symbol* symbol = ExpectIdentifier(1, RemoveExpected);
Symbol* symbol = ExpectIdentifier(RemoveExpected, 1);
if (PeekToken()->Class == CharacterClass) {
ExpectCharacterClass(symbol);
symbol->Type = RefLiteral;
}
else if (PeekToken()->Class == NumberClass) {
symbol->Length = 2;
@@ -104,11 +107,17 @@ void HandleAssemblerDirective() {
RemoveCurrentToken(); //Clear the number token.
ExpectLineEndOrFileEnd(RemoveExpected);
symbol->Type = RefLiteral;
}
else if (PeekToken()->Class == IdentifierClass) {
symbol = ExpectIdentifier(0, RemoveExpected);
symbol->Type = RefExpression;
symbol = ExpectIdentifier(RemoveExpected, 0);
symbol->Length = 2;
//TODO: This needs to be expanded to handle expressions, a symbol to symbol reg is not allowed.
ExpectLineEndOrFileEnd(RemoveExpected);
}
@@ -187,7 +196,7 @@ Token* ExpectMnemonic(void) {
opcode->Lemexe = isByte ? "copyab" : "copya";
PC += 2;
ExpectIdentifier(0, ForwardParser);
ExpectIdentifier(ForwardParser, 0);
}
else {
ExpectPuncuation(LBracket, RemoveExpected);
@@ -245,7 +254,7 @@ Token* ExpectMnemonic(void) {
opcode->Value.Mnemonic = CMPI;
opcode->Lemexe = "CMPI";
ExpectIdentifier(0, ForwardParser);
ExpectIdentifier(ForwardParser, 0);
PC += 2;
}
@@ -302,7 +311,7 @@ Token* ExpectMnemonic(void) {
Token* arg = PeekToken();
if (arg->Class & IdentifierClass) {
ExpectIdentifier(0, ForwardParser);
ExpectIdentifier(ForwardParser, 0);
opcode->Value.Mnemonic = JMP;
opcode->Lemexe = "jmp";
@@ -326,7 +335,7 @@ Token* ExpectMnemonic(void) {
{
PC++;
ExpectIdentifier(0, ForwardParser);
ExpectIdentifier(ForwardParser, 0);
PC += 2;
@@ -338,7 +347,7 @@ Token* ExpectMnemonic(void) {
{
PC++;
ExpectIdentifier(0, ForwardParser);
ExpectIdentifier(ForwardParser, 0);
PC += 2;
@@ -350,7 +359,7 @@ Token* ExpectMnemonic(void) {
{
PC++;
ExpectIdentifier(0, ForwardParser);
ExpectIdentifier(ForwardParser, 0);
PC += 2;
@@ -370,7 +379,7 @@ Token* ExpectMnemonic(void) {
exit(1);
}
ExpectIdentifier(0, ForwardParser);
ExpectIdentifier(ForwardParser, 0);
PC += 2;
}
@@ -407,7 +416,7 @@ void ExpectRegister() {
AdvanceParser();
}
Symbol* ExpectIdentifier(int resolved, ExpectOptions options) {
Symbol* ExpectIdentifier(ExpectOptions options, int expectUnresolved) {
Token* token = PeekToken();
if (token->Class != IdentifierClass) {
@@ -419,17 +428,18 @@ Symbol* ExpectIdentifier(int resolved, ExpectOptions options) {
int found = TryGetSymbol(token->Lemexe, SymbolsTable, &symbol);
if (found && symbol->Resolved && resolved) {
if (found && SymbolResolved(symbol) && expectUnresolved) {
fprintf(stderr, "[Line %d] Redefinition of symbol '%s'.\n", token->LineNumber, token->Lemexe);
exit(4);
}
if (found) {
symbol->Resolved = resolved || symbol->Resolved;
}
else {
symbol = AddSymbolToTable(token->Lemexe, PC, resolved, SymbolsTable);
if (!found) {
//symbol->Resolved = resolved || symbol->Resolved(symbol);
symbol = AddSymbolToTable(token->Lemexe, PC, SymbolsTable);
}
// else {
// symbol = AddSymbolToTable(token->Lemexe, PC, SymbolsTable);
// }
if (options & RemoveExpected) RemoveCurrentToken();
if (options & ForwardParser) AdvanceParser();
@@ -494,11 +504,11 @@ void PrintSymbols(void) {
for(int i = 0; i < SymbolsTable->Size; i++) {
Symbol* symbol = SymbolsTable->Symbols[i];
if (!symbol->References)
printf("[%s] %s [%d] [Width: %d]", symbol->Resolved == 0 ? "Unresolved" : "Resolved", symbol->Name, symbol->Address, symbol->Length);
if (symbol->Type != RefPointer)
printf("[%s] %s [%d] [Width: %d] <%d>", SymbolResolved(symbol) == 0 ? "Unresolved" : "Resolved", symbol->Name, symbol->Address, symbol->Length, symbol->Type);
else {
GetMnemonicText(symbol->References->Value.Mnemonic, mn);
printf("[%s] %s [%d] [Width: %d] -> [%s] Line %d", symbol->Resolved == 0 ? "Unresolved" : "Resolved", symbol->Name, symbol->Address, symbol->Length, mn, symbol->References->LineNumber);
GetMnemonicText(symbol->Value.Mnemonic->Value.Mnemonic, mn);
printf("[%s] %s [%d] [Width: %d] -> [%s] Line %d <%d>", SymbolResolved(symbol) == 0 ? "Unresolved" : "Resolved", symbol->Name, symbol->Address, symbol->Length, mn, symbol->Value.Mnemonic->LineNumber, symbol->Type);
}
printf("\n");
src/symbols_table.c
+19 -4
View File
@@ -3,6 +3,21 @@
#include <stdlib.h>
#include <string.h>
int SymbolResolved(Symbol* symbol) {
if (!symbol) return 0;
switch (symbol->Type) {
case RefLiteral:
return 1;
case RefExpression:
return 0;
case RefPointer:
return symbol->Value.Mnemonic != 0;
default:
return 0;
}
}
SymbolTable* CreateSymbolTable(void){
SymbolTable* table = calloc(1, sizeof(SymbolTable));
@@ -25,7 +40,7 @@ SymbolTable* CreateSymbolTable(void){
return table;
}
Symbol* CreateSymbol(char* name, int address, int resolved) {
Symbol* CreateSymbol(char* name, int address) {
Symbol* symbol = calloc(1, sizeof(Symbol));
if (!symbol) {
@@ -36,7 +51,7 @@ Symbol* CreateSymbol(char* name, int address, int resolved) {
symbol->Address = address;
symbol->Name = name;
symbol->Resolved = resolved;
symbol->Type = RefUnknown;
return symbol;
}
@@ -56,7 +71,7 @@ int TryGetSymbol(char* name, SymbolTable* table, Symbol** outSymbol) {
return 0;
}
Symbol* AddSymbolToTable(char* name, int address, int resolved, SymbolTable* table) {
Symbol* AddSymbolToTable(char* name, int address, SymbolTable* table) {
//if (!name || !value || !table || length == 0) return NULL;
for(int i = 0; i < table->Size; i++) {
@@ -80,7 +95,7 @@ Symbol* AddSymbolToTable(char* name, int address, int resolved, SymbolTable* tab
table->Symbols = newBlock;
}
Symbol* symbol = CreateSymbol(name, address, resolved);
Symbol* symbol = CreateSymbol(name, address);
table->Symbols[table->Size] = symbol;
table->Size++;