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PotatoChip.cpp
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//-----------------------------------------------------------
// PotatoChip.cpp by Auroxsus
// French Fry Productions
// Description: POTATO Compiler program
//-----------------------------------------------------------
#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime> // Used in Potato.h for time stamp
#include <cctype>
#include <vector>
#include <stack> // used to break out of loops
using namespace std;
// #define TRACEREADER
// #define TRACESCANNER
#define TRACEPARSER
//#define TRACEIDENTIFIERTABLE
#define TRACECOMPILER
#include "PotatoChip.h"
//-----------------------------------------------------------
typedef enum
//-----------------------------------------------------------
{
// pseudo-terminals
IDENTIFIER,
INTEGER, // SPUD
STRING, // CHIPPER
EOPTOKEN,
UNKTOKEN,
// reserved words
CRISP,
PROGRAM, // mainCrisp
PRINT, // bite
ENDL, // endl and \n
// logical operators
OR, // \\ and mix
NOR, // ~\ and spudStop
XOR, // +\ and eitherSpud
AND, // && and prep
NAND, // ~& and mashless
NOT, // ! and raw
ABS,
TRUE,
FALSE,
BOOLEAN, // TATER
CONSTANT, // ROOT
INPUT, // UNEARTH
IF,
ELIF,
ELSE,
DO,
WHILE,
FOR,
SWITCH,
ONE,
ALL,
BREAK,
CASE,
DEFAULT,
// punctuation
COMMA,
PERIOD,
SEMICOLON,
OBRACE,
CBRACE,
OSQRBRACKET,
CSQRBRACKET,
OPARENTHESE,
CPARENTHESE,
CONCAT,
COLON,
// relational operators
LT, //<and smallerSpud
LTEQ, // <= and notBiggerSpud
EQEQ, // == and spudMatch
GT, // > and biggerSpud
GTEQ, // >= and notSmallerSpud
NOTEQ, // <>, !=, and mashApart
// assignment opperators
EQ, // = and plant
EQPLUS, // += and mashed
EQMINUS, // -= and peeled
EQMULTIPLY, // *= and fried
EQDIVIDE, // /= and sliced
// arithmetic operators
PLUS, // + and mash
MINUS, // - and peel
MULTIPLY, // *and fry
DIVIDE, // / and slice
MODULUS, // % and mod
POWER, // ^ and pow
INC,
DEC
}TOKENTYPE;
//-----------------------------------------------------------
struct TOKENTABLERECORD
//-----------------------------------------------------------
{
TOKENTYPE type;
char description[15 + 1];
bool isReservedWord;
};
//-----------------------------------------------------------
const TOKENTABLERECORD TOKENTABLE[] =
//-----------------------------------------------------------
{
{ IDENTIFIER, "IDENTIFIER", false },
{ INTEGER, "SPUDLING", true },
{ STRING, "CHIPPER", true },
{ EOPTOKEN, "EOPTOKEN", false },
{ UNKTOKEN, "UNKTOKEN", false },
{ CRISP, "CRISP", true },
{ PROGRAM, "MAINCRISP", true },
{ PRINT, "BITE", true },
{ ENDL, "ENDL", true },
{ OR, "MIX", true },
{ NOR, "SPUDSTOP", true },
{ XOR, "EITHERSPUD", true },
{ AND, "PREP", true },
{ NAND, "MASHLESS", true },
{ NOT, "RAW", true },
{ ABS, "ABS", true },
{ TRUE, "TRUE", true },
{ FALSE, "FALSE", true },
{ BOOLEAN, "TATER", true },
{ CONSTANT, "SPUD", true },
{ INPUT, "UNEARTH", true },
{ IF, "BAKE", true },
{ ELIF, "ELBAKE", true },
{ ELSE, "ELSE", true },
{ DO, "DO", true },
{ WHILE, "FRYASLONGAS", true },
{ FOR, "SEASON", true },
{ SWITCH, "TATERTOGGLE", true }, // rootrelay? PotatoPivot? fryflip
{ CASE, "COOK", true },
{ ONE, "ONE", true },
{ ALL, "ALL", true },
{ BREAK, "SERVE", true },
{ DEFAULT, "DEFAULT" , true },
{ COMMA, "COMMA", false },
{ PERIOD, "PERIOD", false },
{ COLON, "COLON", false },
{ SEMICOLON, "SEMICOLON", false },
{ OBRACE, "OBRACE", false },
{ CBRACE, "CBRACE", false },
{ OSQRBRACKET, "OSQRBRACKET", false },
{ CSQRBRACKET, "CSQRBRACKET", false },
{ OPARENTHESE, "OPARENTHESE", false },
{ CPARENTHESE, "CPARENTHESE", false },
{ LT, "SMALLERSPUD", true },
{ LTEQ, "NOTBIGGERSPUD", true },
{ EQEQ, "SPUDMATCH", true },
{ GT, "BIGGERSPUD", true },
{ GTEQ, "NOTSMALLERSPUD", true },
{ NOTEQ, "MASHAPART", true },
{ EQ, "PLANT", true },
{ EQPLUS, "MASHED", true },
{ EQMINUS, "PEELED", true },
{ EQMULTIPLY, "FRIED", true },
{ EQDIVIDE, "SLICED", true },
{ PLUS, "MASH", true },
{ MINUS, "PEEL", true },
{ MULTIPLY, "FRY", true },
{ DIVIDE, "SLICE", true },
{ MODULUS, "MOD", true },
{ POWER, "POW", true },
{ CONCAT, "CONCAT", false },
{ INC, "SPROUT", true },
{ DEC, "ROOT", true },
};
//-----------------------------------------------------------
struct TOKEN
//-----------------------------------------------------------
{
TOKENTYPE type;
char lexeme[SOURCELINELENGTH + 1];
int sourceLineNumber;
int sourceLineIndex;
};
//--------------------------------------------------
// Global variables
//--------------------------------------------------
READER<CALLBACKSUSED> reader(SOURCELINELENGTH, LOOKAHEAD);
LISTER lister(LINESPERPAGE);
// CODEGENERATION
CODE code;
IDENTIFIERTABLE identifierTable(&lister, MAXIMUMIDENTIFIERS);
// ENDCODEGENERATION
stack<string> loopExitLabel;
#ifdef TRACEPARSER
int level;
#endif
//--------------------------------------------------
// Function to get token description from TOKENTABLE
//--------------------------------------------------
const char *GetTokenDescription(TOKENTYPE type)
{
for (int i = 0; i < (sizeof(TOKENTABLE) / sizeof(TOKENTABLERECORD)); ++i)
{
if (TOKENTABLE[i].type == type)
{
return TOKENTABLE[i].description;
}
}
return "UNKNOWN";
}
//--------------------------------------------------
// Debugging function to print token information
//--------------------------------------------------
void DebugPrintToken(const TOKEN &token, const char *location)
{
const char *description = GetTokenDescription(token.type);
// Check if the token is a reserved word
bool isReserved = false;
for (int i = 0; i < sizeof(TOKENTABLE) / sizeof(TOKENTABLERECORD); ++i)
{
if (TOKENTABLE[i].type == token.type)
{
isReserved = TOKENTABLE[i].isReservedWord;
break;
}
}
// Print debug information
cout << "Debug: Token[0] - Type: " << description
<< ", Lexeme: " << token.lexeme << ", Line: " << token.sourceLineNumber
<< ", Reserved: " << (isReserved ? "Yes" : "No")
<< ", Location: " << location << endl;
}
//-----------------------------------------------------------
void EnterModule(const char module[])
//-----------------------------------------------------------
{
#ifdef TRACEPARSER
char information[SOURCELINELENGTH + 1];
level++;
sprintf(information, " %*s>%s", level *2, " ", module);
lister.ListInformationLine(information);
#endif
}
//-----------------------------------------------------------
void ExitModule(const char module[])
//-----------------------------------------------------------
{
#ifdef TRACEPARSER
char information[SOURCELINELENGTH + 1];
sprintf(information, " %*s<%s", level *2, " ", module);
lister.ListInformationLine(information);
level--;
#endif
}
//--------------------------------------------------
void ProcessCompilerError(int sourceLineNumber, int sourceLineIndex, const char errorMessage[])
//--------------------------------------------------
{
char information[SOURCELINELENGTH + 1];
// Use "panic mode" error recovery technique: report error message and terminate compilation!
sprintf(information, " At (%4d:%3d) %s", sourceLineNumber, sourceLineIndex, errorMessage);
lister.ListInformationLine(information);
lister.ListInformationLine("POTATO compiler ending with a potato famine!\n");
throw (POTATOEXCEPTION("POTATO compiler ending with a potato famine!"));
}
//-----------------------------------------------------------
int main()
//-----------------------------------------------------------
{
void Callback1(int sourceLineNumber, const char sourceLine[]);
void Callback2(int sourceLineNumber, const char sourceLine[]);
void ParsePOTATOProgram(TOKEN tokens[]);
void GetNextToken(TOKEN tokens[]);
char sourceFileName[80 + 1];
TOKEN tokens[LOOKAHEAD + 1];
cout << "Source filename? "; cin >> sourceFileName;
try
{
lister.OpenFile(sourceFileName);
code.OpenFile(sourceFileName);
// CODEGENERATION
code.EmitBeginningCode(sourceFileName);
// ENDCODEGENERATION
reader.SetLister(&lister);
reader.AddCallbackFunction(Callback1);
reader.AddCallbackFunction(Callback2);
reader.OpenFile(sourceFileName);
// Fill tokens[] for look-ahead
for (int i = 0; i <= LOOKAHEAD; i++)
GetNextToken(tokens);
#ifdef TRACEPARSER
level = 0;
#endif
ParsePOTATOProgram(tokens);
// CODEGENERATION
code.EmitEndingCode();
// ENDCODEGENERATION
}
catch (POTATOEXCEPTION potatoException)
{
cout << "POTATO exception: " << potatoException.GetDescription() << endl;
}
lister.ListInformationLine("*******POTATO was cooked thoroughly");
cout << "POTATO was cooked thoroughly\n";
system("PAUSE");
return (0);
}
//-----------------------------------------------------------
void ParsePOTATOProgram(TOKEN tokens[])
//-----------------------------------------------------------
{
void ParseDataDefinitions(TOKEN tokens[], IDENTIFIERSCOPE identifierScope);
void ParseMAINDefinition(TOKEN tokens[]);
void GetNextToken(TOKEN tokens[]);
EnterModule("POTATOProgram");
ParseDataDefinitions(tokens, GLOBALSCOPE);
#ifdef TRACECOMPILER
identifierTable.DisplayTableContents("Contents of identifier table after compilation of global data definitions");
#endif
if (tokens[0].type != CRISP)
{
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting `crisp` keyword");
return;
}
GetNextToken(tokens); // Move past `crisp`
if (tokens[0].type == PROGRAM)
ParseMAINDefinition(tokens);
else
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex,
"Expecting MAIN");
if (tokens[0].type != EOPTOKEN)
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex,
"Expecting end-of-program");
ExitModule("POTATOProgram");
}
//-----------------------------------------------------------
void ParseDataDefinitions(TOKEN tokens[], IDENTIFIERSCOPE identifierScope)
//-----------------------------------------------------------
{
void GetNextToken(TOKEN tokens[]);
char identifier[MAXIMUMLENGTHIDENTIFIER + 1]; // identifier being parsed
char reference[MAXIMUMLENGTHIDENTIFIER + 1]; // Reference for memory location
char literal[MAXIMUMLENGTHIDENTIFIER + 1]; // Stores literal value of a constant
DATATYPE dataType;
bool isConstant; // Flag for constants
bool isInitialized; // Flag to track initialization status
bool isInTable; // Flag for identifier exists in table
bool isInGlobalTable; // Flag for in global table
int index;
EnterModule("DataDefinitions");
while ((tokens[0].type == CONSTANT) || (tokens[0].type == INTEGER) || (tokens[0].type == BOOLEAN))
{
// Initialize flags for each definition
isConstant = false;
isInitialized = false;
// Check if constant
if (tokens[0].type == CONSTANT)
{
isConstant = true;
GetNextToken(tokens); // Move to the datatype (spud/tater)
}
// Determine datatype
switch (tokens[0].type)
{
case INTEGER: // 'spud'
dataType = INTTYPE;
break;
case BOOLEAN: // 'tater'
dataType = BOOLTYPE;
break;
default:
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting a valid data type (spud, tater)");
}
GetNextToken(tokens); // Move to the identifier after datatype
// Parse identifiers (e.g., `spud x1: x2`)
do {
if (tokens[0].type != IDENTIFIER)
{
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting identifier");
}
strcpy(identifier, tokens[0].lexeme);
GetNextToken(tokens); // Move to the next token to check for '=' or ';'
// Expect '=' for constant assignment
if (isConstant && tokens[0].type != EQ)
{
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting '=' for constant assignment");
}
// Handle assignment
if (tokens[0].type == EQ)
{
isInitialized = true; // Mark as initialized
GetNextToken(tokens); // Move to the value after '='
// Handle unary operator for initialization
bool isNegative = false;
if (tokens[0].type == MINUS) {
isNegative = true;
GetNextToken(tokens); // Eat '-'
}else if (tokens[0].type == MINUS){
GetNextToken(tokens); // Eat '+'
}
// Assign value
if (dataType == INTTYPE && tokens[0].type == INTEGER)
{
strcpy(literal, "0D");
strcat(literal, tokens[0].lexeme);
// Add negative sign if applicable
if (isNegative) {
char temp[SOURCELINELENGTH + 1];
strcpy(temp, "-");
strcat(temp, literal);
strcpy(literal, temp); // Update literal with negative value
}
}
else if (dataType == BOOLTYPE && (tokens[0].type == TRUE || tokens[0].type == FALSE))
{
strcpy(literal, tokens[0].lexeme);
}
else
{
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Data type mismatch for constant value");
}
GetNextToken(tokens); // eat '='
}
// Check if the identifier is already in the local or global table
index = identifierTable.GetIndex(identifier, isInTable);
if (isInTable)
{
if (identifierTable.IsInCurrentScope(index))
{
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Multiply-defined identifier in the current scope");
}
else if (identifierScope == PROGRAMMODULESCOPE && identifierTable.GetScope(index) == GLOBALSCOPE)
{
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Local variable name conflicts with a global variable");
}
}
// Add the identifier to the table
if (!isConstant)
{
if (isInitialized)
{
switch (identifierScope)
{
case GLOBALSCOPE:
code.AddDWToStaticData(literal, identifier, reference);
identifierTable.AddToTable(identifier, GLOBAL_VARIABLE, dataType, reference);
break;
case PROGRAMMODULESCOPE:
code.AddDWToStaticData(literal, identifier, reference);
identifierTable.AddToTable(identifier, PROGRAMMODULE_VARIABLE, dataType, reference);
break;
}
}
else
{
switch (identifierScope)
{
case GLOBALSCOPE:
code.AddRWToStaticData(1, identifier, reference);
identifierTable.AddToTable(identifier, GLOBAL_VARIABLE, dataType, reference);
break;
case PROGRAMMODULESCOPE:
code.AddRWToStaticData(1, identifier, reference);
identifierTable.AddToTable(identifier, PROGRAMMODULE_VARIABLE, dataType, reference);
break;
}
}
}
else
{
// Add constant to identifier table
switch (identifierScope)
{
case GLOBALSCOPE:
code.AddDWToStaticData(literal, identifier, reference);
identifierTable.AddToTable(identifier, GLOBAL_CONSTANT, dataType, reference);
break;
case PROGRAMMODULESCOPE:
code.AddDWToStaticData(literal, identifier, reference);
identifierTable.AddToTable(identifier, PROGRAMMODULE_CONSTANT, dataType, reference);
break;
}
}
// Check for more identifiers of the same data type
if (tokens[0].type == COLON)
{
GetNextToken(tokens); // Move to the next identifier after ':'
if (tokens[0].type != IDENTIFIER)
{
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting identifier after ':'");
}
}
else
{
break; // No more identifiers, exit the loop
}
} while (TRUE); // Continue parsing
if (tokens[0].type != SEMICOLON)
{
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Data Expecting ';' at the end of declaration");
}
GetNextToken(tokens); // Move to the next token after the semicolon
}
ExitModule("DataDefinitions");
}
//-----------------------------------------------------------
void ParseMAINDefinition(TOKEN tokens[])
//-----------------------------------------------------------
{
void ParseDataDefinitions(TOKEN tokens[], IDENTIFIERSCOPE identifierScope);
void ParseStatement(TOKEN tokens[]);
void GetNextToken(TOKEN tokens[]);
char line[SOURCELINELENGTH + 1];
char label[SOURCELINELENGTH + 1];
char reference[SOURCELINELENGTH + 1];
EnterModule("PROGRAMDefinition");
// CODEGENERATION
code.EmitUnformattedLine("; ****=========");
sprintf(line, "; ****PROGRAM module (%4d)", tokens[0].sourceLineNumber);
code.EmitUnformattedLine(line);
code.EmitUnformattedLine("; ****=========");
code.EmitFormattedLine("PROGRAMMAIN", "EQU", "*");
// Initialize stack and heap
code.EmitFormattedLine("", "PUSH", "#RUNTIMESTACK", "set SP");
code.EmitFormattedLine("", "POPSP");
code.EmitFormattedLine("", "PUSHA", "STATICDATA", "set SB");
code.EmitFormattedLine("", "POPSB");
code.EmitFormattedLine("", "PUSH", "#HEAPBASE", "initialize heap");
code.EmitFormattedLine("", "PUSH", "#HEAPSIZE");
code.EmitFormattedLine("", "SVC", "#SVC_INITIALIZE_HEAP");
// Call program body
sprintf(label, "PROGRAMBODY%04d", code.LabelSuffix());
code.EmitFormattedLine("", "CALL", label);
// Termination message
code.AddDSToStaticData("Normal program termination", "", reference);
code.EmitFormattedLine("", "PUSHA", reference);
code.EmitFormattedLine("", "SVC", "#SVC_WRITE_STRING");
code.EmitFormattedLine("", "SVC", "#SVC_WRITE_ENDL");
// End program
code.EmitFormattedLine("", "PUSH", "#0D0", "terminate with status = 0");
code.EmitFormattedLine("", "SVC", "#SVC_TERMINATE");
// Program body definition
code.EmitFormattedLine(label, "EQU", "*");
GetNextToken(tokens); // Move past 'crispMAIN'
identifierTable.EnterNestedStaticScope();
ParseDataDefinitions(tokens, PROGRAMMODULESCOPE);
// Check for empty parameter list `()`
if (tokens[0].type != OPARENTHESE) {
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting '('");
}
GetNextToken(tokens); // Move past `(`;
if (tokens[0].type != CPARENTHESE) {
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting ')'");
}
GetNextToken(tokens); // Move past `)`
// Check for opening curly bracket `{`
if (tokens[0].type != OBRACE) {
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex,
"Expecting opening bracket for MAINCRISP function definition");
}
GetNextToken(tokens); // Move past the opening bracket `{`
// Handle **E M P T Y **MAINCRISP block by checking for closing bracket `}`
if (tokens[0].type == CBRACE) {
GetNextToken(tokens); // Move past the closing bracket `}`
} else {
// Process statements inside the MAINCRISP block
while (tokens[0].type != CBRACE && tokens[0].type != EOPTOKEN) {
ParseStatement(tokens);
if (tokens[0].type == EOPTOKEN) {
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex,
"MAIN: Unexpected end-of-program");
}
}
GetNextToken(tokens); // Move past the closing bracket `}`
}
// Return for body
code.EmitFormattedLine("", "RETURN");
code.EmitUnformattedLine("; ****=========");
sprintf(line, "; ****END (%4d)", tokens[0].sourceLineNumber);
code.EmitUnformattedLine(line);
code.EmitUnformattedLine("; ****=========");
#ifdef TRACECOMPILER
identifierTable.DisplayTableContents("Contents of identifier table at end of compilation of PROGRAM module definition");
#endif
identifierTable.ExitNestedStaticScope();
ExitModule("PROGRAMDefinition");
}
//-----------------------------------------------------------
void ParseStatement(TOKEN tokens[])
//-----------------------------------------------------------
{
void ParseAssertion(TOKEN tokens[]);
void ParsePRINTStatement(TOKEN tokens[]);
void ParseINPUTStatement(TOKEN tokens[]);
void ParseAssignmentStatement(TOKEN tokens[], const bool requireSEMICOLON = true);
void ParseIFStatement(TOKEN tokens[]);
void ParseDOWHILEStatement(TOKEN tokens[]);
void ParseFORStatement(TOKEN tokens[]);
void ParseSWITCHStatement(TOKEN tokens[]);
void ParseWHILEStatement(TOKEN tokens[]);
void GetNextToken(TOKEN tokens[]);
EnterModule("Statement");
// Handle assertions enclosed in braces
while (tokens[0].type == OBRACE) {
ParseAssertion(tokens);
}
switch (tokens[0].type)
{
case PRINT:
ParsePRINTStatement(tokens);
break;
case INPUT:
ParseINPUTStatement(tokens);
break;
case IDENTIFIER:
ParseAssignmentStatement(tokens, true);
break;
case INTEGER:
case BOOLEAN:
case CONSTANT:
ParseDataDefinitions(tokens, PROGRAMMODULESCOPE);
break;
case IF:
ParseIFStatement(tokens);
break;
case DO:
ParseDOWHILEStatement(tokens);
break;
case FOR:
ParseFORStatement(tokens);
break;
case WHILE:
ParseWHILEStatement(tokens);
break;
case SWITCH:
ParseSWITCHStatement(tokens);
break;
case BREAK: // Handle `serve` as a break
if (loopExitLabel.empty()) {
// If there's no loop or switch to break out of, it's an error
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Unexpected 'serve' outside of a loop or switch");
} else {
// Emit jump to the exit label of the current loop/switch
code.EmitFormattedLine("", "JMP", loopExitLabel.top().c_str());
GetNextToken(tokens); // eat 'serve'
if (tokens[0].type != SEMICOLON)
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Print Expecting ';'");
GetNextToken(tokens); // eat ';'
}
break;
default:
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex,
"ParseStatement: Expecting beginning-of-statement");
break;
}
// Handle assertions enclosed in braces (post-statement)
while (tokens[0].type == OBRACE) {
ParseAssertion(tokens);
}
ExitModule("Statement");
}
//-----------------------------------------------------------
void ParseAssertion(TOKEN tokens[])
//-----------------------------------------------------------
{
void ParseExpression(TOKEN tokens[], DATATYPE &datatype);
void GetNextToken(TOKEN tokens[]);
char line[SOURCELINELENGTH+1];
DATATYPE datatype;
EnterModule("Assertion");
sprintf(line, "; **** %4d: { assertion }", tokens[0].sourceLineNumber);
code.EmitUnformattedLine(line);
GetNextToken(tokens); // eat '{'
ParseExpression(tokens, datatype);
// STATICSEMANTICS
if (datatype != BOOLTYPE) {
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting boolean expression");
}
// ENDSTATICSEMANTICS
// CODEGENERATION
/*
SETT
JMPT E????
PUSH #0D(sourceLineNumber)
PUSH #0D1
JMP HANDLERUNTIMEERROR
E???? EQU *
DISCARD #0D1
*/
char Elabel[SOURCELINELENGTH+1], operand[SOURCELINELENGTH+1];
code.EmitFormattedLine("", "SETT");
sprintf(Elabel, "E%04d", code.LabelSuffix());
code.EmitFormattedLine("", "JMPT", Elabel);
sprintf(operand, "#0D%d", tokens[0].sourceLineNumber);
code.EmitFormattedLine("", "PUSH", operand);
code.EmitFormattedLine("", "PUSH", "#0D1");
code.EmitFormattedLine("", "JMP", "HANDLERUNTIMEERROR");
code.EmitFormattedLine(Elabel, "EQU", "*");
code.EmitFormattedLine("", "DISCARD", "#0D1");
// Check for closing brace
if (tokens[0].type != CBRACE) {
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Expecting }");
}
GetNextToken(tokens); // eat '}'
ExitModule("Assertion");
}
//-----------------------------------------------------------
void ParsePRINTStatement(TOKEN tokens[])
//-----------------------------------------------------------
{
void ParseExpression(TOKEN tokens[], DATATYPE &datatype);
void GetNextToken(TOKEN tokens[]);
char line[SOURCELINELENGTH + 1];
DATATYPE datatype;
EnterModule("PRINTStatement");
sprintf(line, "; ****PRINT statement (%4d)", tokens[0].sourceLineNumber);
code.EmitUnformattedLine(line);
do {
GetNextToken(tokens); // move past 'bite'
switch (tokens[0].type)
{
case STRING:
// CODEGENERATION
char reference[SOURCELINELENGTH + 1];
code.AddDSToStaticData(tokens[0].lexeme, "", reference);
code.EmitFormattedLine("", "PUSHA", reference);
code.EmitFormattedLine("", "SVC", "#SVC_WRITE_STRING");
// ENDCODEGENERATION
GetNextToken(tokens);
break;
case ENDL:
// CODEGENERATION
code.EmitFormattedLine("", "SVC", "#SVC_WRITE_ENDL");
// ENDCODEGENERATION
GetNextToken(tokens);
break;
default:
{
ParseExpression(tokens, datatype);
// CODEGENERATION
switch (datatype)
{
case INTTYPE:
code.EmitFormattedLine("", "SVC", "#SVC_WRITE_INTEGER");
break;
case BOOLTYPE:
code.EmitFormattedLine("", "SVC", "#SVC_WRITE_BOOLEAN");
break;
}
// ENDCODEGENERATION
}
}
} while (tokens[0].type == COMMA);
if (tokens[0].type != SEMICOLON)
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Print Expecting ';'");
GetNextToken(tokens); // eat ';'
ExitModule("PRINTStatement");
}
//-----------------------------------------------------------
void ParseINPUTStatement(TOKEN tokens[])
//-----------------------------------------------------------
{
void ParseVariable(TOKEN tokens[], bool asLValue, DATATYPE &datatype);
void GetNextToken(TOKEN tokens[]);
char reference[SOURCELINELENGTH + 1];
char line[SOURCELINELENGTH + 1];
DATATYPE datatype;
EnterModule("INPUTStatement");
sprintf(line, "; ****INPUT statement (%4d)", tokens[0].sourceLineNumber);
code.EmitUnformattedLine(line);
GetNextToken(tokens); // eat '"'
if (tokens[0].type == STRING)
{
// CODEGENERATION
code.AddDSToStaticData(tokens[0].lexeme, "", reference);
code.EmitFormattedLine("", "PUSHA", reference);
code.EmitFormattedLine("", "SVC", "#SVC_WRITE_STRING");
// ENDCODEGENERATION
GetNextToken(tokens); // eat '"'
}
ParseVariable(tokens, true, datatype);
// CODEGENERATION
switch (datatype)
{
case INTTYPE:
code.EmitFormattedLine("", "SVC", "#SVC_READ_INTEGER");
break;
case BOOLTYPE:
code.EmitFormattedLine("", "SVC", "#SVC_READ_BOOLEAN");
break;
}
code.EmitFormattedLine("", "POP", "@SP:0D1");
code.EmitFormattedLine("", "DISCARD", "#0D1");
// ENDCODEGENERATION
if (tokens[0].type != SEMICOLON)
ProcessCompilerError(tokens[0].sourceLineNumber, tokens[0].sourceLineIndex, "Input Expecting ';'");
GetNextToken(tokens); // eat ';'
ExitModule("INPUTStatement");
}
/*
||-----------------------------------------------------------
|| <AssignmentStatement> ::= <Variable> '=' <Expression> [ ':' <Variable> '=' <Expression> ]* ';'
||-----------------------------------------------------------
||
|| Features:
|| - Supports multiple left-hand side variables separated by commas.
|| - Ensures compatibility between left-hand and right-hand side data types.
|| - Generates intermediate code for assignment operations.
|| - Optionally requires a terminating semicolon.
||
|| Example Code Outline:
|| Assignment Statement:
|| <Variable> = <Expression>
|| <Intermediate Code>
|| MAKEDUP
|| POP @SP:0D2
|| SWAP
|| DISCARD #0D1
|| ...
|| End of Code
||
|| Syntax Errors:
|| - Missing '=' in the assignment statement.
|| - Data type mismatch between LHS and RHS.
|| - Missing ';' at the end of the statement.
||--------------------------------------------------------
*/
//----------------------------------------------------------
void ParseAssignmentStatement(TOKEN tokens[], const bool requireSEMICOLON = true)
//-----------------------------------------------------------
{
void ParseVariable(TOKEN tokens[], bool asLValue, DATATYPE &datatype);
void ParseExpression(TOKEN tokens[], DATATYPE &datatype);
void GetNextToken(TOKEN tokens[]);
char line[SOURCELINELENGTH + 1];
DATATYPE datatypeLHS, datatypeRHS;
EnterModule("AssignmentStatement");
sprintf(line, "; **** assignment statement (%4d)", tokens[0].sourceLineNumber);
code.EmitUnformattedLine(line);
// Parse the left-hand side variable
ParseVariable(tokens, true, datatypeLHS);
bool isRHSSet = false; // Flag to track if RHS has been set
// Handle additional variables and assignments
while (tokens[0].type == COLON || tokens[0].type == EQ)
{
if (tokens[0].type == COLON)
{
// Handle colon-separated variable
DATATYPE datatype;