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typeChecker.c
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typeChecker.c
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/*
GROUP - 14
Created By:
1) Tarun Kumar (2016A7PS0005P)
2) Varun Gupta (2016A7PS0087P)
3) Avichal Jain (2016A7PS0046P)
4) Vaibhav Maheshwari (2016A7PS0081P)
*/
#include "typeChecker.h"
#include "stdlib.h"
#include "symbol.h"
#include <string.h>
#define INITIAL_CAPACITY 2
int recordNumber = 200;
int currentCapacity = INITIAL_CAPACITY;
char **mappingRecordNumberToType;
int capacity = INITIAL_CAPACITY;
int globalOffset = 0;
bool hasSemanticErrors = false;
void checkInList(hashList *list, char *checkAgainst, bool *array) {
hashList *temp = list;
while (temp != NULL) {
hashtableInt *hashTable = temp->head;
int val = hash_getInt(hashTable, checkAgainst);
if (val != -1) {
array[temp->iterativeScope] = true;
}
temp = temp->next;
}
}
void putInTable(hashtableInt *table, ParseTree node) {
if (node->firstChild == NULL) {
hash_putInt(table, node->lexeme, 0);
return;
}
ParseTree child = node->firstChild;
for (int i = 0; i < node->noOfChildren; i++) {
putInTable(table, child);
child = child->sibling;
}
}
void handleIterativeSemantics(ParseTree astNode, bool *array, hashList *list, bool toPrint) {
if (astNode->firstChild == NULL) {
return;
}
if (astNode->id == 122) { //"assignmentStmt"
char *checkAgainst = astNode->firstChild->firstChild->lexeme;
checkInList(list, checkAgainst, array);
} else if (astNode->id == 125) { //"funCallStmt"
ParseTree temp = astNode->firstChild;
while (temp->id != TK_FUNID) {
checkInList(list, temp->lexeme, array);
temp = temp->sibling;
}
} else if (astNode->id == 131) { //"ioStmt"
if (astNode->firstChild->id == TK_WRITE) {
return;
}
checkInList(list, astNode->firstChild->sibling->lexeme, array);
} else if (astNode->id == 128) { //"iterativeStmt"
hashList *temp = (hashList *) malloc(sizeof(hashList));
temp->head = createHashtableInt(101);
temp->iterativeScope = list != NULL ? list->iterativeScope + 1 : 0;
if (temp->iterativeScope == currentCapacity) {
array = (bool *) realloc(array, sizeof(bool) * currentCapacity * 2);
currentCapacity *= 2;
}
temp->next = list;
list = temp;
putInTable(temp->head, astNode->firstChild);
ParseTree child = astNode->firstChild->sibling;
int endLine = 0;
for (int i = 0; i < astNode->noOfChildren - 1; i++) {
handleIterativeSemantics(child, array, list, toPrint);
if (i == astNode->noOfChildren - 2) {
endLine = child->lineno;
}
child = child->sibling;
}
//error reporting
if (!array[temp->iterativeScope]) {
hasSemanticErrors = true;
if (toPrint)
printf("Lines %d-%d : None of the variables participating in the iterations of the "
"while loop gets updated.\n", astNode->firstChild->lineno, endLine);
}
hashList *freeNode = list;
list = list->next;
free(freeNode);
array[temp->iterativeScope] = false;
} else if (astNode->id == 129) { //"conditionalStmt"
ParseTree child = astNode->firstChild->sibling;
while (child->id != 130) {
handleIterativeSemantics(child, array, list, toPrint);
child = child->sibling;
}
ParseTree temp = child->firstChild;
for (int i = 0; i < child->noOfChildren; i++) {
handleIterativeSemantics(temp, array, list, toPrint);
temp = temp->sibling;
}
} else {
ParseTree temp = astNode->firstChild;
for (int i = 0; i < astNode->noOfChildren; i++) {
handleIterativeSemantics(temp, array, list, toPrint);
temp = temp->sibling;
}
}
}
void
computeType(ParseTree astNode, symbolTable parentSymbolTable, symbolTable globalSymbolTable, hashtableInt *hashTable,
bool toPrint) {
symbolTable table = NULL;
if (astNode->id == 4) {
astNode->dataType = TK_INT;
} else if (astNode->id == 5) {
astNode->dataType = TK_REAL;
} else if (astNode->id == 3) {
symbolTable inputSymbolTable = getAttributeValue(parentSymbolTable, "input_par", "inputParScope");
SymbolTableEntry *entry = NULL;
if (inputSymbolTable != NULL) {
entry = getSymbolTableEntry(inputSymbolTable, astNode->lexeme);
if (entry == NULL) {
symbolTable outputSymbolTable = getAttributeValue(parentSymbolTable, "output_par", "outputParScope");
if (outputSymbolTable->symbolTableCapacity != 0) {
entry = getSymbolTableEntry(outputSymbolTable, astNode->lexeme);
if (entry != NULL) {
table = outputSymbolTable;
}
}
} else {
table = inputSymbolTable;
}
}
if (entry == NULL) {
entry = getSymbolTableEntry(parentSymbolTable, astNode->lexeme);
if (entry == NULL) {
entry = getSymbolTableEntry(globalSymbolTable, astNode->lexeme);
if (entry == NULL) {
if (hash_getInt(hashTable, astNode->lexeme) == -1) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Variable %s is not declared.\n", astNode->lineno, astNode->lexeme);
}
hash_putInt(hashTable, astNode->lexeme, astNode->lineno);
astNode->dataType = TK_ERROR;
return;
} else {
table = globalSymbolTable;
}
} else {
table = parentSymbolTable;
}
}
int val = *(int *) getAttributeValue(table, astNode->lexeme, "dataType");
if (val == 7) { //TK_RECORDID
char *recordid = (char *) getAttributeValue(table, astNode->lexeme, "recordType");
if (astNode->sibling != NULL && astNode->sibling->id == TK_FIELDID) {
symbolTable recordScopeTable = (symbolTable) getAttributeValue(globalSymbolTable, recordid,
"recordScope");
astNode->dataType = *(int *) getAttributeValue(recordScopeTable, astNode->sibling->lexeme, "dataType");
} else {
astNode->dataType = *(int *) getAttributeValue(globalSymbolTable, recordid, "recordNumber");
}
} else {
astNode->dataType = val;
}
}
}
void checkIfAssigned(char *lexeme, ParseTree output, bool assigned[]) {
ParseTree outPar = NULL;
if (output != NULL) {
outPar = output->firstChild;
}
int i = 0;
while (outPar != NULL) {
if (strcmp(outPar->sibling->lexeme, lexeme) == 0) {
assigned[i] = true;
break;
}
i++;
outPar = outPar->sibling->sibling;
}
}
void
buildSymbolTableHelper(symbolTable parentSymbolTable, symbolTable globalSymbolTable, ParseTree astNode, int *offset,
ParseTree func, bool toPrint) {
if (astNode->firstChild == NULL && astNode->id != 105) {
return;
}
if (astNode->id == 103) { //"function"
symbolTable funcSymbolTable = initializeSymbolTable();
if (globalSymbolTable->table != NULL &&
getSymbolTableEntry(globalSymbolTable, astNode->firstChild->lexeme) != NULL) {
return;
}
putInSymbolTable(globalSymbolTable, astNode->firstChild->lexeme, TK_FUNID);
addAttribute(globalSymbolTable, astNode->firstChild->lexeme, "funcScope", funcSymbolTable);
ParseTree child = astNode->firstChild;
int *pointer = (int *) malloc(sizeof(int));
*pointer = 0;
for (int i = 0; i < astNode->noOfChildren; i++) {
buildSymbolTableHelper(funcSymbolTable, globalSymbolTable, child, pointer, astNode, toPrint);
child = child->sibling;
}
addAttribute(globalSymbolTable, astNode->firstChild->lexeme, "offset", pointer);
return;
}
if (astNode->id == 113) { //"typeDefinition"
if (getSymbolTableEntry(globalSymbolTable, astNode->firstChild->lexeme) != NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Multiple definition of %s.\n", astNode->firstChild->lineno,
astNode->firstChild->lexeme);
return;
}
putInSymbolTable(globalSymbolTable, astNode->firstChild->lexeme, TK_RECORD);
symbolTable recordSymbolTable = initializeSymbolTable();
addAttribute(globalSymbolTable, astNode->firstChild->lexeme, "recordScope", recordSymbolTable);
int *pointer = (int *) malloc(sizeof(int));
*pointer = recordNumber;
addAttribute(globalSymbolTable, astNode->firstChild->lexeme, "recordNumber", pointer);
if (recordNumber == capacity - 1) {
mappingRecordNumberToType = (char **) realloc(mappingRecordNumberToType, capacity * 2 * sizeof(char *));
capacity *= 2;
}
mappingRecordNumberToType[recordNumber - 200] = astNode->firstChild->lexeme;
recordNumber++;
int *array = (int *) malloc(sizeof(int) * (astNode->noOfChildren - 1));
memset(array, -1, sizeof(int) * (astNode->noOfChildren - 1));
ParseTree fieldDefinition = astNode->firstChild->sibling;
int i = 0;
while (fieldDefinition != NULL) {
putInSymbolTable(recordSymbolTable, fieldDefinition->firstChild->sibling->lexeme, TK_FIELDID);
addAttribute(recordSymbolTable, fieldDefinition->firstChild->sibling->lexeme, "dataType",
&fieldDefinition->firstChild->id);
array[i] = fieldDefinition->firstChild->id;
fieldDefinition = fieldDefinition->sibling;
i++;
}
addAttribute(globalSymbolTable, astNode->firstChild->lexeme, "fieldTypes", array);
return;
}
if (astNode->id == 118) { //"declaration"
symbolTable table = parentSymbolTable;
if (astNode->noOfChildren == 3) { //global
table = globalSymbolTable;
}
if (table->symbolTableCapacity != 0 &&
getSymbolTableEntry(table, astNode->firstChild->sibling->lexeme) != NULL) {
if (table == globalSymbolTable) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Variable %s being a global variable, cannot be declared more than once.\n",
astNode->firstChild->sibling->lineno, astNode->firstChild->sibling->lexeme);
} else {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The identifier %s is declared more than once.\n",
astNode->firstChild->sibling->lineno, astNode->firstChild->sibling->lexeme);
}
return;
} else if (table->symbolTableCapacity != 0 && table == parentSymbolTable &&
getSymbolTableEntry(globalSymbolTable, astNode->firstChild->sibling->lexeme) != NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Identifier declared globally cannot be declared anywhere else in function definition.\n",
astNode->firstChild->sibling->lineno);
return;
} else if (table->symbolTableCapacity != 0 && table == globalSymbolTable &&
parentSymbolTable->symbolTableCapacity != 0
&& getSymbolTableEntry(parentSymbolTable, astNode->firstChild->sibling->lexeme) != NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Identifier declared locally cannot be again declared globally.\n",
astNode->firstChild->sibling->lineno);
return;
}
if (func != NULL) {
ParseTree inputPar = func->firstChild->sibling;
ParseTree outputPar = inputPar->sibling;
ParseTree temp = inputPar->firstChild;
for (int i = 0; i < inputPar->noOfChildren / 2; i++) {
if (strcmp(temp->sibling->lexeme, astNode->firstChild->sibling->lexeme) == 0) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Multiple declaration of %s.\n", astNode->firstChild->sibling->lineno,
astNode->firstChild->sibling->lexeme);
return;
}
temp = temp->sibling->sibling;
}
temp = outputPar->firstChild;
for (int i = 0; i < outputPar->noOfChildren / 2; i++) {
if (strcmp(temp->sibling->lexeme, astNode->firstChild->sibling->lexeme) == 0) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Multiple declaration of %s.\n", astNode->firstChild->sibling->lineno,
astNode->firstChild->sibling->lexeme);
return;
}
temp = temp->sibling->sibling;
}
}
char *offsetString = (char *) malloc(sizeof(char) * 4);
if (astNode->noOfChildren == 3) { //"global"
strcpy(offsetString, "-");
if (astNode->firstChild->id == TK_RECORDID &&
getSymbolTableEntry(globalSymbolTable, astNode->firstChild->lexeme) == NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Type %s is undefined.\n", astNode->firstChild->lineno,
astNode->firstChild->lexeme);
int *val = (int *) malloc(sizeof(int));
*val = TK_ERROR;
putInSymbolTable(table, astNode->firstChild->sibling->lexeme, TK_ID);
addAttribute(table, astNode->firstChild->sibling->lexeme,
"dataType", val);
return;
}
int offset = 0;
if (astNode->firstChild->id == TK_INT) {
offset += 2;
} else if (astNode->firstChild->id == TK_REAL) {
offset += 4;
} else {
int *recordType = (int *) getAttributeValue(globalSymbolTable, astNode->firstChild->lexeme,
"fieldTypes");
symbolTable recordScope = (symbolTable) getAttributeValue(globalSymbolTable,
astNode->firstChild->lexeme,
"recordScope");
for (int i = 0; i < recordScope->symbolTableSize; i++) {
if (recordType[i] == TK_INT) {
offset += 2;
} else {
offset += 4;
}
}
}
putInSymbolTable(table, astNode->firstChild->sibling->lexeme, TK_ID);
char *off = (char *) malloc(sizeof(char) * 4);
sprintf(off, "%d", globalOffset);
globalOffset += offset;
addAttribute(globalSymbolTable, astNode->firstChild->sibling->lexeme, "globalOffset", off);
} else {
int temp = *offset;
if (astNode->firstChild->id == TK_INT) {
*offset += 2;
} else if (astNode->firstChild->id == TK_REAL) {
*offset += 4;
} else {
if (getSymbolTableEntry(globalSymbolTable, astNode->firstChild->lexeme) == NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Type %s is undefined.\n", astNode->firstChild->lineno,
astNode->firstChild->lexeme);
int *val = (int *) malloc(sizeof(int));
*val = TK_ERROR;
putInSymbolTable(table, astNode->firstChild->sibling->lexeme, TK_ID);
addAttribute(table, astNode->firstChild->sibling->lexeme,
"dataType", val);
return;
}
int *recordType = (int *) getAttributeValue(globalSymbolTable, astNode->firstChild->lexeme,
"fieldTypes");
symbolTable recordScope = (symbolTable) getAttributeValue(globalSymbolTable,
astNode->firstChild->lexeme,
"recordScope");
for (int i = 0; i < recordScope->symbolTableSize; i++) {
if (recordType[i] == TK_INT) {
*offset += 2;
} else {
*offset += 4;
}
}
}
sprintf(offsetString, "%d", temp);
putInSymbolTable(table, astNode->firstChild->sibling->lexeme, TK_ID);
}
addAttribute(table, astNode->firstChild->sibling->lexeme,
"dataType", &astNode->firstChild->id);
addAttribute(table, astNode->firstChild->sibling->lexeme, "recordType",
astNode->firstChild->lexeme);
addAttribute(table, astNode->firstChild->sibling->lexeme, "offset", offsetString);
return;
}
if (astNode->id == 101) { //"mainFunction"
symbolTable funcSymbolTable = initializeSymbolTable();
putInSymbolTable(parentSymbolTable, "_main", TK_MAIN);
addAttribute(parentSymbolTable, "_main", "funcScope", funcSymbolTable);
ParseTree child = astNode->firstChild;
int *pointer = (int *) malloc(sizeof(int));
*pointer = 0;
for (int i = 0; i < astNode->noOfChildren; i++) {
buildSymbolTableHelper(funcSymbolTable, globalSymbolTable, child, pointer, NULL, toPrint);
child = child->sibling;
}
addAttribute(globalSymbolTable, "_main", "offset", pointer);
return;
}
//recursive calls to children
ParseTree child = astNode->firstChild;
for (int i = 0; i < astNode->noOfChildren; i++) {
buildSymbolTableHelper(parentSymbolTable, globalSymbolTable, child, offset, func, toPrint);
child = child->sibling;
}
}
void misMatchError(ParseTree node, bool toPrint) {
ParseTree astNodeLeft, astNodeRight = node->firstChild->sibling;
int lineno;
char *op;
if (node->id == 122) {
astNodeLeft = node->firstChild->firstChild;
lineno = astNodeLeft->lineno;
op = strdup("<---");
} else {
astNodeLeft = node->firstChild;
lineno = node->lineno;
op = strdup(node->lexeme);
}
int type1 = astNodeLeft->dataType;
int type2 = astNodeRight->dataType;
char *recordType1, *recordType2;
if (type1 >= 200) {
recordType1 = mappingRecordNumberToType[type1 - 200];
}
if (type2 >= 200) {
recordType2 = mappingRecordNumberToType[type2 - 200];
}
if (type1 >= 200) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
lineno, recordType1, type2 >= 200 ? recordType2 : TermSymbol[type2], op);
} else if (type2 >= 200) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
lineno, type1 >= 200 ? recordType1 : TermSymbol[type1], recordType2, op);
} else {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
lineno, TermSymbol[type1], TermSymbol[type2], op);
}
}
void typeChecker(ParseTree astNode, symbolTable parentSymbolTable, symbolTable globalSymbolTable, ParseTree output,
bool assigned[], bool isOutermostWhile, hashtableInt *table, bool toPrint) {
if (astNode->firstChild == NULL) {
computeType(astNode, parentSymbolTable, globalSymbolTable, table, toPrint);
return;
}
if (astNode->id == 113 || astNode->id == 118) { //"typeDefinition","declaration"
return;
}
if (astNode->id == 104) { //"input_par"
symbolTable inputParSymbolTable = initializeSymbolTable();
putInSymbolTable(parentSymbolTable, "input_par", TK_NULL);
addAttribute(parentSymbolTable, "input_par", "inputParScope", inputParSymbolTable);
ParseTree child = astNode->firstChild;
char **array = (char **) malloc(sizeof(char *) * astNode->noOfChildren / 2);
int count = 0;
int totalOffset = 0;
while (child != NULL) {
int offset = 0;
if (inputParSymbolTable->symbolTableSize != 0 &&
getSymbolTableEntry(inputParSymbolTable, child->sibling->lexeme) != NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Multiple declaration of %s.\n", child->sibling->lineno, child->sibling->lexeme);
child = child->sibling->sibling;
continue;
}
if (getSymbolTableEntry(globalSymbolTable, child->sibling->lexeme) != NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Global variable %s cannot be declared as an input parameter.\n", child->lineno,
child->sibling->lexeme);
child = child->sibling->sibling;
continue;
}
if (child->id == TK_RECORDID && getSymbolTableEntry(globalSymbolTable, child->lexeme) == NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Type %s undefined.\n", child->lineno, child->lexeme);
putInSymbolTable(inputParSymbolTable, child->sibling->lexeme, TK_ID);
int *val = (int *) malloc(sizeof(int));
*val = TK_ERROR;
addAttribute(inputParSymbolTable, child->sibling->lexeme, "dataType", val);
} else {
putInSymbolTable(inputParSymbolTable, child->sibling->lexeme, TK_ID);
addAttribute(inputParSymbolTable, child->sibling->lexeme, "dataType", &child->id);
addAttribute(inputParSymbolTable, child->sibling->lexeme, "recordType",
child->lexeme);
if (child->id == TK_INT) {
offset += 2;
} else if (child->id == TK_REAL) {
offset += 4;
} else {
int *recordType = (int *) getAttributeValue(globalSymbolTable, child,
"fieldTypes");
symbolTable recordScope = (symbolTable) getAttributeValue(globalSymbolTable,
child,
"recordScope");
for (int i = 0; i < recordScope->symbolTableSize; i++) {
if (recordType[i] == TK_INT) {
offset += 2;
} else {
offset += 4;
}
}
}
array[count] = strdup(child->lexeme);
count++;
}
char *offString = (char *) malloc(sizeof(char) * 4);
sprintf(offString, "%d", totalOffset);
totalOffset += offset;
addAttribute(inputParSymbolTable, child->sibling->lexeme, "offset", offString);
child = child->sibling->sibling;
}
addAttribute(parentSymbolTable, "input_par", "parameterTypes", array);
char *offString = (char *) malloc(sizeof(char) * 4);
sprintf(offString, "%d", totalOffset);
addAttribute(parentSymbolTable, "input_par", "offset", offString);
return;
}
if (astNode->id == 105) { //"output_par"
symbolTable outputParSymbolTable = initializeSymbolTable();
putInSymbolTable(parentSymbolTable, "output_par", TK_NULL);
addAttribute(parentSymbolTable, "output_par", "outputParScope", outputParSymbolTable);
ParseTree child = astNode->firstChild;
char **array = (char **) malloc(sizeof(char *) * astNode->noOfChildren / 2);
int count = 0;
int totalOffset = atoi((char *) getAttributeValue(parentSymbolTable, "input_par", "offset"));
while (child != NULL) {
int offset = 0;
if ((outputParSymbolTable->symbolTableSize != 0 &&
getSymbolTableEntry(outputParSymbolTable, child->sibling->lexeme) != NULL) ||
(getSymbolTableEntry((symbolTable) getAttributeValue(parentSymbolTable, "input_par", "inputParScope"),
child->sibling->lexeme) != NULL)) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Multiple declaration of %s.\n", child->sibling->lineno, child->sibling->lexeme);
child = child->sibling->sibling;
continue;
}
if (getSymbolTableEntry(globalSymbolTable, child->sibling->lexeme) != NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Global variable %s cannot be declared as an output parameter.\n", child->lineno,
child->sibling->lexeme);
child = child->sibling->sibling;
continue;
}
if (child->id == TK_RECORDID && getSymbolTableEntry(globalSymbolTable, child->lexeme) == NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Type %s undefined.\n", child->lineno, child->lexeme);
putInSymbolTable(outputParSymbolTable, child->sibling->lexeme, TK_ID);
int *val = (int *) malloc(sizeof(int));
*val = TK_ERROR;
addAttribute(outputParSymbolTable, child->sibling->lexeme, "dataType", val);
} else {
putInSymbolTable(outputParSymbolTable, child->sibling->lexeme, TK_ID);
addAttribute(outputParSymbolTable, child->sibling->lexeme, "dataType", &child->id);
addAttribute(outputParSymbolTable, child->sibling->lexeme, "recordType",
child->lexeme);
if (child->id == TK_INT) {
offset += 2;
} else if (child->id == TK_REAL) {
offset += 4;
} else {
int *recordType = (int *) getAttributeValue(globalSymbolTable, child->lexeme,
"fieldTypes");
symbolTable recordScope = (symbolTable) getAttributeValue(globalSymbolTable,
child->lexeme,
"recordScope");
for (int i = 0; i < recordScope->symbolTableSize; i++) {
if (recordType[i] == TK_INT) {
offset += 2;
} else {
offset += 4;
}
}
}
array[count] = strdup(child->lexeme);
count++;
}
char *offString = (char *) malloc(sizeof(char) * 4);
sprintf(offString, "%d", totalOffset);
totalOffset += offset;
addAttribute(outputParSymbolTable, child->sibling->lexeme, "offset", offString);
child = child->sibling->sibling;
}
addAttribute(parentSymbolTable, "output_par", "parameterTypes", array);
char *offString = (char *) malloc(sizeof(char) * 4);
sprintf(offString, "%d", totalOffset);
addAttribute(parentSymbolTable, "output_par", "offset", offString);
return;
}
if (astNode->id == 103) { //"function"
symbolTable funcSymbolTable = (symbolTable) getAttributeValue(globalSymbolTable, astNode->firstChild->lexeme,
"funcScope");
void *value = getAttributeValue(globalSymbolTable, astNode->firstChild->lexeme, "isOverloaded");
if (value != NULL && strcmp((char *) value, "True") == 0) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Function (%s) overloading not allowed.\n", astNode->firstChild->lineno,
astNode->firstChild->lexeme);
return;
}
addAttribute(globalSymbolTable, astNode->firstChild->lexeme, "isOverloaded", "True");
ParseTree child = astNode->firstChild;
ParseTree output_par = astNode->firstChild->sibling->sibling;
int noOfOutputPar = (output_par->noOfChildren) / 2;
bool assignedPar[noOfOutputPar];
memset(assignedPar, 0, sizeof(bool) * noOfOutputPar);
int endLine = 0;
hashtableInt *newTable = createHashtableInt(101);
for (int i = 0; i < astNode->noOfChildren; i++) {
typeChecker(child, funcSymbolTable, globalSymbolTable, output_par, assignedPar, isOutermostWhile, newTable,
toPrint);
if (i == astNode->noOfChildren - 1) {
endLine = child->lineno;
}
child = child->sibling;
}
ParseTree outPar = output_par->firstChild;
for (int i = 0; i < noOfOutputPar; i++) {
if (!assignedPar[i]) {
hasSemanticErrors = true;
if (toPrint)
printf("Lines %d-%d : Output parameter %s is not assigned any value in function %s\n",
astNode->firstChild->lineno, endLine, outPar->sibling->lexeme,
astNode->firstChild->lexeme);
}
outPar = outPar->sibling->sibling;
}
return;
}
if (astNode->id == 101) { //"mainFunction"
symbolTable funcSymbolTable = (symbolTable) getAttributeValue(globalSymbolTable, "_main", "funcScope");
ParseTree child = astNode->firstChild;
hashtableInt *newTable = createHashtableInt(101);
for (int i = 0; i < astNode->noOfChildren; i++) {
typeChecker(child, funcSymbolTable, globalSymbolTable, NULL, NULL, isOutermostWhile, newTable, toPrint);
child = child->sibling;
}
return;
}
if (astNode->id == 128 && isOutermostWhile) { //"iterativeStmt"
ParseTree child = astNode->firstChild;
for (int i = 0; i < astNode->noOfChildren; i++) {
typeChecker(child, parentSymbolTable, globalSymbolTable, output, assigned, false, table, toPrint);
child = child->sibling;
}
bool *array = (bool *) malloc(sizeof(bool) * INITIAL_CAPACITY);
memset(array, false, sizeof(bool) * INITIAL_CAPACITY);
handleIterativeSemantics(astNode, array, NULL, toPrint);
return;
}
//recursive calls to children
ParseTree child = astNode->firstChild;
for (int i = 0; i < astNode->noOfChildren; i++) {
typeChecker(child, parentSymbolTable, globalSymbolTable, output, assigned, isOutermostWhile, table, toPrint);
child = child->sibling;
}
// type checking
if (astNode->id == 140 || astNode->id == 133 ||
astNode->id == 123) { // "all"|"arithmeticExpression"|"singleOrRecId"
astNode->dataType = astNode->firstChild->dataType;
}
if (astNode->id == TK_PLUS || astNode->id == TK_MINUS) {
int type1 = astNode->firstChild->dataType;
int type2 = astNode->firstChild->sibling->dataType;
if (type1 == TK_ERROR && type2 == TK_ERROR) {
astNode->dataType = TK_ERROR;
return;
}
if (type1 == TK_ERROR || type2 == TK_ERROR) {
astNode->dataType = TK_ERROR;
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
astNode->lineno, type1 >= 200 ? mappingRecordNumberToType[type1 - 200] : TermSymbol[type1],
type2 >= 200 ? mappingRecordNumberToType[type2 - 200] : TermSymbol[type2], astNode->lexeme);
return;
}
if (type1 != type2) {
misMatchError(astNode, toPrint);
astNode->dataType = TK_ERROR;
return;
}
if (type1 == TK_BOOLEAN) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type TK_BOOLEAN cannot be used with the operator %s.\n",
astNode->lineno, astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
astNode->dataType = type1;
}
if (astNode->id == TK_MUL) {
int type1 = astNode->firstChild->dataType;
int type2 = astNode->firstChild->sibling->dataType;
if (type1 == TK_ERROR && type2 == TK_ERROR) {
astNode->dataType = TK_ERROR;
return;
}
if (type1 == TK_ERROR || type2 == TK_ERROR) {
astNode->dataType = TK_ERROR;
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
astNode->lineno, type1 >= 200 ? mappingRecordNumberToType[type1 - 200] : TermSymbol[type1],
type2 >= 200 ? mappingRecordNumberToType[type2 - 200] : TermSymbol[type2], astNode->lexeme);
return;
}
if ((type1 >= 200 && (type2 == TK_INT || type2 == TK_REAL)) ||
(type2 >= 200 && (type1 == TK_INT || type1 == TK_REAL))) {
astNode->dataType = type1 > type2 ? type1 : type2;
return;
}
if (type1 >= 200 && type2 >= 200) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type TK_RECORD cannot be used with the operator %s.\n",
astNode->lineno, astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
if (type1 != type2) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
astNode->lineno, TermSymbol[type1], TermSymbol[type2], astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
if (type1 == TK_BOOLEAN) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type TK_BOOLEAN cannot be used with the operator %s.\n",
astNode->lineno, astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
astNode->dataType = type1;
}
if (astNode->id == TK_DIV) {
int type1 = astNode->firstChild->dataType;
int type2 = astNode->firstChild->sibling->dataType;
if (type1 == TK_ERROR && type2 == TK_ERROR) {
astNode->dataType = TK_ERROR;
return;
}
if (type1 == TK_ERROR || type2 == TK_ERROR) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
astNode->lineno, type1 >= 200 ? mappingRecordNumberToType[type1 - 200] : TermSymbol[type1],
type2 >= 200 ? mappingRecordNumberToType[type2 - 200] : TermSymbol[type2], astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
if (type2 >= 200) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type TK_RECORD cannot be used on the right side of operator %s.\n",
astNode->lineno, astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
if ((type1 >= 200 && (type2 == TK_INT || type2 == TK_REAL))) {
astNode->dataType = type1;
return;
}
if (type1 != type2) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
astNode->lineno, TermSymbol[type1], TermSymbol[type2], astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
if (type1 == TK_BOOLEAN) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type TK_BOOLEAN cannot be used with the operator %s.\n",
astNode->lineno, astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
astNode->dataType = type1;
}
if (astNode->id == 131) { // "ioStmt"
if (astNode->firstChild->id == TK_WRITE) {
return;
}
checkIfAssigned(astNode->firstChild->sibling->lexeme, output, assigned);
return;
}
if (astNode->id == 122) { // "assignmentStmt"
checkIfAssigned(astNode->firstChild->firstChild->lexeme, output, assigned);
int type1 = astNode->firstChild->dataType;
int type2 = astNode->firstChild->sibling->dataType;
if (type1 == TK_ERROR && type2 == TK_ERROR) {
return;
}
if (type2 == TK_ERROR) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of <---.\n",
astNode->firstChild->firstChild->lineno,
type1 >= 200 ? mappingRecordNumberToType[type1 - 200] : TermSymbol[type1],
TermSymbol[type2]);
astNode->dataType = TK_ERROR;
return;
}
if (type1 != type2) {
misMatchError(astNode, toPrint);
astNode->dataType = TK_ERROR;
return;
}
astNode->dataType = type1;
}
if (astNode->id == TK_LE || astNode->id == TK_LT || astNode->id == TK_GE || astNode->id == TK_GT
|| astNode->id == TK_NE || astNode->id == TK_EQ) { //"relational Operator"
int type1 = astNode->firstChild->dataType;
int type2 = astNode->firstChild->sibling->dataType;
if (type1 == TK_ERROR && type2 == TK_ERROR) {
astNode->dataType = TK_ERROR;
return;
}
if (type1 == TK_ERROR || type2 == TK_ERROR) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
astNode->lineno, TermSymbol[type1], TermSymbol[type2], astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
if ((type1 == TK_INT || type1 == TK_REAL) && (type2 == TK_INT || type2 == TK_REAL)) {
if (type1 != type2) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
astNode->lineno, TermSymbol[type1], TermSymbol[type2], astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
} else {
astNode->dataType = TK_BOOLEAN;
}
} else {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type TK_RECORD cannot be used with the operator %s.\n",
astNode->lineno, astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
}
if (astNode->id == TK_AND || astNode->id == TK_OR) { //"logical Operator"
int type1 = astNode->firstChild->dataType;
int type2 = astNode->firstChild->sibling->dataType;
if (type1 == TK_ERROR && type2 == TK_ERROR) {
astNode->dataType = TK_ERROR;
return;
}
if (type1 == TK_ERROR || type2 == TK_ERROR) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s on the left side does not match with the type %s on the right side of operator %s.\n",
astNode->lineno, TermSymbol[type1], TermSymbol[type2], astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
astNode->dataType = TK_BOOLEAN;
}
if (astNode->id == TK_NOT) {
if (astNode->firstChild->dataType != TK_BOOLEAN) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : The type %s cannot be used with the operator %s.\n",
astNode->lineno, TermSymbol[astNode->firstChild->dataType], astNode->lexeme);
astNode->dataType = TK_ERROR;
return;
}
astNode->dataType = TK_BOOLEAN;
}
if (astNode->id == 125) { //"funCallStmt"
ParseTree temp = astNode->firstChild;
int noOfInput = 0;
int noOfOutput = 0;
while (temp->id != TK_FUNID) {
noOfOutput++;
checkIfAssigned(temp->lexeme, output, assigned);
temp = temp->sibling;
}
if (getSymbolTableEntry(globalSymbolTable, temp->lexeme) == NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Implicit declaration of function %s.\n", temp->lineno, temp->lexeme);
return;
}
symbolTable funcSymbolTable = (symbolTable) getAttributeValue(globalSymbolTable, temp->lexeme, "funcScope");
char **inputParameterTypes = (char **) getAttributeValue(funcSymbolTable, "input_par", "parameterTypes");
char **outputParameterTypes = (char **) getAttributeValue(funcSymbolTable, "output_par", "parameterTypes");
int noOfInputPar = ((symbolTable) getAttributeValue(funcSymbolTable, "input_par",
"inputParScope"))->symbolTableSize;
int noOfOutputPar = ((symbolTable) getAttributeValue(funcSymbolTable, "output_par",
"outputParScope"))->symbolTableSize;
if (inputParameterTypes == NULL) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Function cannot be invoked recursively.\n", temp->lineno);
return;
}
temp = temp->sibling;
while (temp != NULL) {
noOfInput++;
temp = temp->sibling;
}
temp = astNode->firstChild;
int counterInput = 0, counterOutput = 0;
if (noOfInput != noOfInputPar) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Number of actual parameters must be same as number of formal parameters.\n",
temp->lineno);
return;
} else if (noOfOutput != noOfOutputPar) {
hasSemanticErrors = true;
if (toPrint)
printf("Line %d : Expected %d output parameter(s), got %d.\n", temp->lineno,
noOfOutputPar, noOfOutput);
return;
}
while (counterOutput < noOfOutputPar) {
char *type = outputParameterTypes[counterOutput];
int dataType;
if (strcmp(type, "int") != 0 && strcmp(type, "real") != 0) {
dataType = *(int *) getAttributeValue(globalSymbolTable, type, "recordNumber");
} else {
dataType = strcmp(type, "int") == 0 ? TK_INT : TK_REAL;
}
if (temp->dataType != dataType) {
hasSemanticErrors = true;
if (toPrint)