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nodetype.c
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#include "nodetype.h"
int currentRegister = 0;
int currPushLevel[] = {-1,-1,-1,-1,-1,-1,-1,-1};
int currentLabel = 0;
//Expression Tree Related Functions
struct nodeTypeTag * makeConstantNode(int value,int type) {
struct nodeTypeTag *p;
/* allocate node */
p = malloc(sizeof(struct nodeTypeTag));
if (p == NULL)
outOfMemory();
/* copy information */
p->lineNumber = lineNumber;
p->nodeClass = CONSTANT;
p->con.type = type;
p->con.value = value;
return p;
}
struct nodeTypeTag * makeIdNode(char * varName, struct nodeTypeTag * expressionNode) {
struct nodeTypeTag *p;
/* allocate node */
p = malloc(sizeof(struct nodeTypeTag));
if (p == NULL)
outOfMemory();
/* copy information */
p->nodeClass = ID;
p->lineNumber = lineNumber;
p->id.name = varName;
p->id.innerId = NULL;
//Expression Node for Finding Shift amount
struct Gsymbol * GsymbolPointer;
p->id.expressionNode = expressionNode;
GsymbolPointer = getVariable(varName);
//Saving Global Table entry of current Variable
p->id.GsymbolPointer = GsymbolPointer;
p->id.isRef = 0;
return p;
}
struct nodeTypeTag * makeOperationNode(int oper, int nops, ...) {
va_list ap;
struct nodeTypeTag *p;
int i;
/* allocate node */
p = malloc(sizeof(struct nodeTypeTag));
if (p == NULL){
outOfMemory();
}
p->opr.op = malloc(nops * sizeof(struct nodeTypeTag));
if (p->opr.op == NULL){
outOfMemory();
}
/* copy information */
p->nodeClass = OPERATION;
p->lineNumber = lineNumber;
p->opr.oper = oper;
p->opr.nops = nops;
va_start(ap, nops);
for (i = 0; i < nops; i++)
p->opr.op[i]= *va_arg(ap, struct nodeTypeTag *);
va_end(ap);
return p;
}
struct nodeTypeTag * makeInnerVar(struct nodeTypeTag * Id,char * name){
struct innerVariable * head;
head = Id->id.innerId;
struct innerVariable * newInnerId;
newInnerId = malloc(sizeof(struct innerVariable));
newInnerId->name = name;
newInnerId->next = NULL;
if(!head){
Id->id.innerId = newInnerId;
return Id;
}
while(head->next){
head = head->next;
}
head->next = newInnerId;
return Id;
}
//For function Arguments
struct fArgExpression * makeFargNode(struct nodeTypeTag * exprNode){
struct fArgExpression * fArg;
fArg = malloc(sizeof(struct fArgExpression));
fArg->exprNode = exprNode;
fArg->next = NULL;
return fArg;
}
//For the node for functions
struct nodeTypeTag * makeFunctionNode(char * funcName, struct fArgExpression * fArgExps){
struct nodeTypeTag *p;
/* allocate node */
p = malloc(sizeof(struct nodeTypeTag));
if (p == NULL)
outOfMemory();
/* copy information */
p->nodeClass = FUNC;
p->lineNumber = lineNumber;
p->func.funcName = funcName;
p->func.fArgExps = fArgExps;
return p;
}
//To reverse the srgument expressions for functions
struct fArgExpression * reverseArgList(struct fArgExpression * fArgExps){
struct fArgExpression * fArgExpsArr[20];
int i=0,j;
while(fArgExps){
fArgExpsArr[i] = fArgExps;
fArgExps = fArgExps->next;
i = i+1;
}
fArgExpsArr[0]->next = NULL;
for(j=i-1;j>0;j--){
fArgExpsArr[j]->next = fArgExpsArr[j-1];
}
return fArgExpsArr[i-1];
}
int getRegister(){
currentRegister = (currentRegister+1)%8;
if(currentRegister == 0){
currPushLevel[currentRegister] += 1;
}
else{
currPushLevel[currentRegister] = currPushLevel[currentRegister-1];
}
if(currPushLevel[currentRegister] > 0){
fprintf(fp, "PUSH R%d\n", currentRegister);
}
return currentRegister;
}
struct typeTable * getFieldType(char * name,struct typeTable * type){
struct Fieldlist * fields;
fields = type->fields;
while(fields){
if(strcmp(fields->name,name)==0){
return fields->type;
}
fields = fields->next;
}
return NULL;
}
int releaseRegister(){
if((currentRegister == 0)&&(currPushLevel[currentRegister] <= 0)){
currentRegister = 0;
return 0;
}
if(currPushLevel[currentRegister] > 0)
fprintf(fp, "POP R%d\n", currentRegister);
currPushLevel[currentRegister]--;
currentRegister = (currentRegister + 7)%8;
return 0;
}
int getPrevRegister(){
//printf("%d\n",(currentRegister + 7)%8);
return (currentRegister - 1)%8;
}
int freePushLevel(){
int i;
for(i=0;i<8;i++){
currPushLevel[i] = -1;
}
currentRegister = 0;
return 0;
}
void pushUptoCurrRegister(){
int i =0;
while(i<=currentRegister){
fprintf(fp, "PUSH R%d\n", i);
i++;
}
}
void popUptoCurrRegister(){
int i=currentRegister;
while(i>=0){
fprintf(fp, "POP R%d\n", i);
i-=1;
}
}
void initializeRegister(){
int i=0;
for(i=0;i<8;i++){
currPushLevel[i]=-1;
}
int currentRegister = 0;
}
int evaluate(struct nodeTypeTag *p){
struct fArgExpression * argExpRev;
struct fArgExpression * argExpRevHead;
struct Gsymbol * funcGsymbolPoi;
struct argList * arguments;
struct nodeTypeTag * idNode;
struct typeTable * type;
struct innerVariable * head;
int localCurrentLabel1;
int localCurrentLabel2;
int binding;
if(p == NULL){
return 0;
}
switch(p->nodeClass){
case CONSTANT :
getRegister();
fprintf(fp,"MOV R%d, %d\n",currentRegister,p->con.value);
return 0;
case ID :
//Check if variable is in Local Table
if(getLocalVariableBinding(p->id.name,currLocalTable) != 0){
//For user defined data types
if(p->id.innerId){
//Accessing the main Pointer
fprintf(fp,"MOV R0, R0//\tAttribute Problem\n");
fprintf(fp,"MOV R0, R0//\tAccessing local variable %s binding %d\n",p->id.name,getLocalVariableBinding(p->id.name,currLocalTable));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getLocalVariableBinding(p->id.name,currLocalTable)));
getRegister();
fprintf(fp, "MOV R%d, BP\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
type = p->id.LsymbolPointer->type;
head = p->id.innerId;
//For accessing the heap
while(head){
fprintf(fp,"MOV R0, R0//\tAccessing attribute %s binding %d\n",head->name,getAttributeBinding(head->name,type));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getAttributeBinding(head->name,type)));
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(), currentRegister);
releaseRegister();
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
type = getFieldType(head->name,type);
head = head->next;
}
return 0;
}
fprintf(fp,"MOV R0, R0//\tAccessing local variable %s binding %d\n",p->id.name,getLocalVariableBinding(p->id.name,currLocalTable));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getLocalVariableBinding(p->id.name,currLocalTable)));
getRegister();
fprintf(fp, "MOV R%d, BP\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
}
//If variable is not in Local Table
else{
//For user defined data types
if(p->id.innerId){
//Accessing the main Pointer
fprintf(fp,"MOV R0, R0//\tAttribute Problem\n");
fprintf(fp,"MOV R0, R0//\tAccessing global variable %s binding %d\n",p->id.name,getVariableBinding(p->id.GsymbolPointer,0));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getVariableBinding(p->id.GsymbolPointer,0)));
getRegister();
fprintf(fp, "MOV R%d, 1000\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
type = p->id.GsymbolPointer->type;
head = p->id.innerId;
//For accessing the heap
while(head){
fprintf(fp,"MOV R0, R0//\tAccessing attribute %s binding %d\n",head->name,getAttributeBinding(head->name,type));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getAttributeBinding(head->name,type)));
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(), currentRegister);
releaseRegister();
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
type = getFieldType(head->name,type);
head = head->next;
}
return 0;
}
fprintf(fp,"MOV R0, R0//\tAccessing global variable %s binding %d\n",p->id.name,getVariableBinding(p->id.GsymbolPointer,0));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getVariableBinding(p->id.GsymbolPointer,0)));
getRegister();
fprintf(fp, "MOV R%d, 1000\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
evaluate(p->id.expressionNode);
fprintf(fp, "ADD R%d, R%d\n", getPrevRegister(), currentRegister);
releaseRegister();
fprintf(fp, "MOV R%d, [R%d]\n", currentRegister,currentRegister);
}
return 0;
case FUNC:
//freePushLevel();
fprintf(fp,"MOV R0, R0//\tPushing All Used Registers(%d)\n",currentRegister);
pushUptoCurrRegister();
fprintf(fp,"MOV R0, R0//\tCalling Function %s\n",p->func.funcName);
//Pushing Arguments
if(p->func.fArgExps){
argExpRevHead = reverseArgList(p->func.fArgExps);
argExpRev = argExpRevHead;
while(argExpRev){
evaluate(argExpRev->exprNode);
fprintf(fp, "PUSH R%d\n",currentRegister);
releaseRegister();
argExpRev = argExpRev->next;
}
}
//For return Value
fprintf(fp,"MOV R0, R0//\tFor return Address\n");
fprintf(fp, "PUSH R%d\n",currentRegister);
fprintf(fp, "CALL %s\n",p->func.funcName);
//Setting SP
//fprintf(fp, "MOV SP, BP\n");
getRegister();
fprintf(fp,"MOV R0, R0//\tTo Get The Return Value\n");
//Get The Return Value
fprintf(fp,"POP R%d\n",currentRegister);
//POPs arguments
fprintf(fp,"MOV R0, R0//\tRemoving Arguments\n");
if(p->func.fArgExps){
//Revesed List of Argument Expressions for Function Call
argExpRev = reverseArgList(argExpRevHead);
funcGsymbolPoi = getSymbolTableTuple(p->func.funcName);
arguments = funcGsymbolPoi->args;
while(argExpRev){
if(arguments->isRef==1){
fprintf(fp, "MOV R0, R0//\tCall By Reference Problem\n");
//Get The Binding of Variable
idNode = argExpRev->exprNode;
binding = getLocalVariableBinding(idNode->id.name,currLocalTable);
if( binding != 0){
if(idNode->id.innerId){
fprintf(fp, "MOV R0, R0//\tAttribute Problem\n");
getRegister();
fprintf(fp, "POP R%d\n",currentRegister);
fprintf(fp, "MOV R0, R0//\tAccessing local variable %s binding %d\n",idNode->id.name,binding);
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,binding);
getRegister();
fprintf(fp, "MOV R%d, BP\n",currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
head = idNode->id.innerId;
idNode->id.LsymbolPointer = getLocalTableEntry(idNode->id.name,currLocalTable);
type = idNode->id.LsymbolPointer->type;
while(head){
fprintf(fp,"MOV R0, R0//\tAccessing attribute %s binding %d\n",head->name,getAttributeBinding(head->name,type));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getAttributeBinding(head->name,type)));
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(), currentRegister);
releaseRegister();
if(head->next)
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
type = getFieldType(head->name,type);
head = head->next;
}
fprintf(fp, "MOV [R%d], R%d\n",currentRegister,getPrevRegister());
releaseRegister();
releaseRegister();
}
else{
getRegister();
getRegister();
fprintf(fp, "POP R%d\n",getPrevRegister());
fprintf(fp, "MOV R0, R0//\tAccessing local variable %s binding %d\n",idNode->id.name,binding);
fprintf(fp, "MOV R%d, %d\n",currentRegister,binding);
getRegister();
fprintf(fp, "MOV R%d, BP\n",currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
fprintf(fp, "MOV [R%d], R%d\n",currentRegister,getPrevRegister());
releaseRegister();
releaseRegister();
}
}
//If variable is not in Local Table
else{
if(idNode->id.innerId){
fprintf(fp, "MOV R0, R0//\tAttribute Problem\n");
getRegister();
fprintf(fp, "POP R%d\n",currentRegister);
fprintf(fp, "MOV R0, R0//\tAccessing global variable %s binding %d\n",idNode->id.name,getVariableBinding(idNode->id.GsymbolPointer,0));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getVariableBinding(idNode->id.GsymbolPointer,0)));
getRegister();
fprintf(fp, "MOV R%d, 1000\n",currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
head = p->id.innerId;
type = p->id.GsymbolPointer->type;
while(head){
fprintf(fp,"MOV R0, R0//\tAccessing attribute %s binding %d\n",head->name,getAttributeBinding(head->name,type));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getAttributeBinding(head->name,type)));
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(), currentRegister);
releaseRegister();
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
type = getFieldType(head->name,type);
head = head->next;
}
fprintf(fp, "MOV [R%d], R%d\n",currentRegister,getPrevRegister());
}
else{
getRegister();
fprintf(fp, "POP R%d\n",currentRegister);
fprintf(fp, "MOV R0, R0//\tAccessing global variable %s binding %d\n",idNode->id.name,getVariableBinding(idNode->id.GsymbolPointer,0));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getVariableBinding(idNode->id.GsymbolPointer,0)));
getRegister();
fprintf(fp, "MOV R%d, 1000\n",currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
evaluate(idNode->id.expressionNode);
fprintf(fp, "ADD R%d, R%d\n", getPrevRegister(), currentRegister);
releaseRegister();
fprintf(fp, "MOV [R%d], R%d\n", currentRegister,getPrevRegister());
releaseRegister();
releaseRegister();
}
}
}
else{
fprintf(fp, "POP R0\n");
}
argExpRev = argExpRev->next;
arguments = arguments->next;
}
}
fprintf(fp,"MOV R0, R0//\tRestoring Registers\n");
releaseRegister();
popUptoCurrRegister();
getRegister();
return 0;
case OPERATION:
switch(p->opr.oper){
case '+' :
evaluate(&(p->opr.op[0]));
evaluate(&p->opr.op[1]);
fprintf(fp,"ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 1;
case '@' :
fprintf(fp,"MOV R0, R0 // Reading Memory\n");
evaluate(&p->opr.op[0]);
fprintf(fp,"MOV R%d, [R%d]\n",currentRegister ,currentRegister);
return 1;
case '#' :
fprintf(fp,"MOV R0, R0 // Writing to Memory\n");
evaluate(&p->opr.op[0]);
evaluate(&p->opr.op[1]);
fprintf(fp,"MOV [R%d], R%d\n",getPrevRegister() ,currentRegister);
releaseRegister();
return 1;
case '-' :
evaluate(&p->opr.op[0]);
evaluate(&p->opr.op[1]);
fprintf(fp,"SUB R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 1;
case '*' :
evaluate(&p->opr.op[0]);
evaluate(&p->opr.op[1]);
fprintf(fp,"MUL R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 1;
break;
case '/' :
evaluate(&p->opr.op[0]);
evaluate(&p->opr.op[1]);
fprintf(fp,"DIV R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 1;
case '%' :
evaluate(&p->opr.op[0]);
evaluate(&p->opr.op[1]);
fprintf(fp,"MOD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 1;
case '~' :
evaluate(&p->opr.op[0]);
evaluate(&p->opr.op[1]);
fprintf(fp,"EQ R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 1;
case '<' :
evaluate(&p->opr.op[0]);
evaluate(&p->opr.op[1]);
fprintf(fp,"LT R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 1;
case '>' :
evaluate(&p->opr.op[0]);
evaluate(&p->opr.op[1]);
fprintf(fp,"GT R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 1;
case '=' :
/*To Get The Shift Amount*/
//getRegister();
if(getLocalVariableBinding(p->opr.op[0].id.name,currLocalTable) != 0){
if(p->opr.op[0].id.innerId){
//Accessing the main Pointer
fprintf(fp,"MOV R0, R0//\tAttribute Problem\n");
fprintf(fp,"MOV R0, R0//\tAccessing local variable %s binding %d\n",p->opr.op[0].id.name,getLocalVariableBinding(p->opr.op[0].id.name,currLocalTable));
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getLocalVariableBinding(p->opr.op[0].id.name,currLocalTable)));
getRegister();
fprintf(fp, "MOV R%d, BP\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
type = p->opr.op[0].id.LsymbolPointer->type;
head = p->opr.op[0].id.innerId;
//For accessing the heap
while(head){
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
fprintf(fp,"MOV R0, R0//\tAccessing attribute %s binding %d\n",head->name,getAttributeBinding(head->name,type));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getAttributeBinding(head->name,type)));
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(), currentRegister);
releaseRegister();
type = getFieldType(head->name,type);
head = head->next;
}
}
else{
fprintf(fp,"MOV R0, R0//\tAccessing local variable %s binding %d for =\n",p->opr.op[0].id.name,getLocalVariableBinding(p->opr.op[0].id.name,currLocalTable));
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getLocalVariableBinding(p->opr.op[0].id.name,currLocalTable)));
getRegister();
fprintf(fp, "MOV R%d, BP\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
}
}
else{
//For user defined data types
if(p->opr.op[0].id.innerId){
//Accessing the main Pointer
fprintf(fp,"MOV R0, R0//\tAttribute Problem\n");
fprintf(fp,"MOV R0, R0//\tAccessing global variable %s binding %d\n",p->opr.op[0].id.name,getVariableBinding(p->opr.op[0].id.GsymbolPointer,0));
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getVariableBinding(p->opr.op[0].id.GsymbolPointer,0)));
getRegister();
fprintf(fp, "MOV R%d, 1000\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
type = p->opr.op[0].id.GsymbolPointer->type;
head = p->opr.op[0].id.innerId;
//For accessing the heap
while(head){
fprintf(fp, "MOV R%d, [R%d]\n",currentRegister,currentRegister);
fprintf(fp,"MOV R0, R0//\tAccessing attribute %s binding %d\n",head->name,getAttributeBinding(head->name,type));
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getAttributeBinding(head->name,type)));
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(), currentRegister);
releaseRegister();
type = getFieldType(head->name,type);
head = head->next;
}
}
else{
//getRegister();
fprintf(fp,"MOV R0, R0//\tAccessing Global variable %s binding %d for =\n",p->opr.op[0].id.name,getVariableBinding(p->opr.op[0].id.GsymbolPointer,0));
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getVariableBinding(p->opr.op[0].id.GsymbolPointer,0)));
getRegister();
fprintf(fp, "MOV R%d, 1000\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
evaluate(p->opr.op[0].id.expressionNode);
fprintf(fp, "ADD R%d, R%d\n", getPrevRegister(), currentRegister);
releaseRegister();
}
}
//getRegister();
evaluate(&p->opr.op[1]);
fprintf(fp, "MOV [R%d], R%d\n", getPrevRegister(),currentRegister);
releaseRegister();
releaseRegister();
return 0;
case 'R' :
if(getLocalVariableBinding(p->opr.op[0].id.name,currLocalTable) != 0){
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getLocalVariableBinding(p->opr.op[0].id.name,currLocalTable)));
getRegister();
fprintf(fp, "MOV R%d, BP\n",currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(),currentRegister);
fprintf(fp, "IN R%d\n",currentRegister);
fprintf(fp, "MOV [R%d], R%d\n",getPrevRegister() ,currentRegister);
releaseRegister();
}
else{
currentRegister = -1;
evaluate(p->opr.op[0].id.expressionNode);
getRegister();
fprintf(fp, "MOV R%d, %d\n", currentRegister,(getVariableBinding(p->opr.op[0].id.GsymbolPointer,0)));
getRegister();
fprintf(fp, "MOV R%d, 1000\n", currentRegister);
fprintf(fp, "ADD R%d, R%d\n",getPrevRegister(), currentRegister);
releaseRegister();
fprintf(fp, "ADD R%d, R%d\n", getPrevRegister(), currentRegister);
releaseRegister();
getRegister();
fprintf(fp, "IN R%d\n", currentRegister);
fprintf(fp, "MOV [R%d], R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
}
//releaseRegister();
return 0;
case 'W' :
evaluate(&p->opr.op[0]);
fprintf(fp, "OUT R%d\n",currentRegister);
releaseRegister();
return 0;
case 'I' :
evaluate(&(p->opr.op[0]));
localCurrentLabel1 = ++currentLabel;
localCurrentLabel2 = ++currentLabel;
fprintf(fp,"JZ R%d, LABEL%d\n",currentRegister,localCurrentLabel1);
releaseRegister();
currentLabel++;
evaluate(&(p->opr.op[1]));
releaseRegister();
fprintf(fp,"JMP LABEL%d\n",localCurrentLabel2);
fprintf(fp,"LABEL%d:\n",localCurrentLabel1);
if(p->opr.nops > 2){
evaluate(&(p->opr.op[2]));
releaseRegister();
}
fprintf(fp,"LABEL%d:\n",localCurrentLabel2);
return 0;
case 'S' :
freePushLevel();
evaluate(&(p->opr.op[0]));
fprintf(fp,"MOV R0, R0//\tEnd of Statement\n");
freePushLevel();
evaluate(&(p->opr.op[1]));
freePushLevel();
return 0;
case 'L' :
localCurrentLabel1 = ++currentLabel;
localCurrentLabel2 = ++currentLabel;
fprintf(fp,"LABEL%d:\n",localCurrentLabel1);
evaluate(&(p->opr.op[0]));
fprintf(fp,"JZ R%d, LABEL%d\n",currentRegister,localCurrentLabel2);
releaseRegister();
evaluate(&(p->opr.op[1]));
fprintf(fp,"JMP LABEL%d\n",localCurrentLabel1);
fprintf(fp,"LABEL%d:\n",localCurrentLabel2);
return 0;
case '&' :
getRegister();
evaluate(&p->opr.op[0]);
getRegister();
evaluate(&p->opr.op[1]);
fprintf(fp,"MUL R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 0;
case '|' :
getRegister();
evaluate(&p->opr.op[0]);
getRegister();
evaluate(&p->opr.op[1]);
fprintf(fp,"ADD R%d, R%d\n",getPrevRegister(),currentRegister);
fprintf(fp,"MOV R%d, 0\n",currentRegister);
fprintf(fp,"GT R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 0;
case '!' :
getRegister();
evaluate(&p->opr.op[0]);
getRegister();
fprintf(fp,"MOV R%d, -1\n",currentRegister);
fprintf(fp,"ADD R%d, R%d\n",getPrevRegister(),currentRegister);
fprintf(fp,"MUL R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
return 0;
case '^' :
fprintf(fp,"MOV R0, R0//\tReturn Statement Begins Here\n");
currentRegister = -1;
evaluate(&p->opr.op[0]);
getRegister();
fprintf(fp,"MOV R%d, BP\n",currentRegister);
getRegister();
fprintf(fp,"MOV R%d, -2\n",currentRegister);
fprintf(fp,"ADD R%d, R%d\n",getPrevRegister(),currentRegister);
releaseRegister();
fprintf(fp,"MOV [R%d], R%d\n",currentRegister,getPrevRegister());
releaseRegister();
freePushLevel();
fprintf(fp,"MOV SP, BP\n");
fprintf(fp,"POP BP\n");
fprintf(fp,"RET\n");
}
}
return 0;
}
/*
0 -> Error
1 -> Integer
2 -> Character
3 -> Boolean
*/
struct Gsymbol * funcGsymbolPoi;
struct Gsymbol * tempFuncGsymbolPointer;
struct argList * arguments;
struct fArgExpression * fArgExps;
int hasError = 0;
int result = 0;
struct typeTable * type;
struct innerVariable * head;
int analyse(struct nodeTypeTag *p){
if(p == NULL){
return 0;
}
switch(p->nodeClass){
case CONSTANT :
return p->con.type;
case FUNC :
funcGsymbolPoi = getSymbolTableTuple(p->func.funcName);
arguments = funcGsymbolPoi->args;
fArgExps = p->func.fArgExps;
while(arguments && fArgExps){
result = analyse(fArgExps->exprNode);
if((result==3)&&(strcmp(arguments->type->name,"boolean") == 0)){
result = result;
}
else if((result==1)&&(strcmp(arguments->type->name,"integer") == 0)){
result = result;
}
else if((result == 1)&&(arguments->type)){
result = result;
}
else{
printf("line %d : Invalid Argument Type\n",p->lineNumber);
hasError = 1;
}
if((arguments->isRef)&&(fArgExps->exprNode->nodeClass != ID)){
printf("line %d : Argument must be an ID for Call By Reference\n",p->lineNumber);
hasError = 1;
}
/*
if(fArgExps->exprNode->nodeClass == CONSTANT){
printf("It's a constant\n");
printf("TYPE IS %d\n",fArgExps->exprNode->con.type);
}
printf("TYPE IS %d i.e %s\n",result,arguments->type->name);
*/
arguments = arguments->next;
fArgExps = fArgExps->next;
}
if((arguments || fArgExps)||hasError){
return 0;
}
else{
if(strcmp(funcGsymbolPoi->type->name,"boolean") == 0){
return 3;
}
else{
return 1;
}
}
case ID :
if(getLocalVariableBinding(p->id.name,currLocalTable) != 0){
//printf("Reached Here...\n");
p->id.LsymbolPointer = getLocalTableEntry(p->id.name,currLocalTable);
if(p->id.innerId){
type = p->id.LsymbolPointer->type;
head = p->id.innerId;
while(head){
type = getFieldType(head->name,type);
if(!type){
printf("line %d : Invalid attribute %s \n",p->lineNumber,head->name);
return 0;
}
head = head->next;
}
if(strcmp(type->name,"boolean")==0){
return 3;
}
else{
return 1;
}
}
p->id.LsymbolPointer = getLocalTableEntry(p->id.name,currLocalTable);
if(strcmp(p->id.LsymbolPointer->type->name, "integer") == 0)
return 1;
if(strcmp(p->id.LsymbolPointer->type->name, "boolean") == 0)
return 3;
if(p->id.LsymbolPointer->type){
return 1;
}
printf("line %d : Array index must be an Integer\n",p->lineNumber);
return 0;
}
else if(getVariableBinding(p->id.GsymbolPointer,0) != -1){
if(p->id.innerId){
type = p->id.GsymbolPointer->type;
head = p->id.innerId;
while(head){
type = getFieldType(head->name,type);
if(!type){
printf("line %d : Invalid attribute %s \n",p->lineNumber,head->name);
return 0;
}
head = head->next;
}
if(strcmp(type->name,"boolean")==0){
return 3;
}
else{
return 1;
}
}
if(analyse(p->id.expressionNode) == 1){
if(strcmp(p->id.GsymbolPointer->type->name, "integer") == 0)
return 1;
if(strcmp(p->id.GsymbolPointer->type->name, "boolean") == 0)
return 3;
if(p->id.GsymbolPointer->type){
return 1;
}
}
printf("line %d : Array index must be an Integer\n",p->lineNumber);
return 0;
}
printf("line %d : Undefined Symbol %s\n",p->lineNumber,p->id.name);
return 0;
case OPERATION:
switch(p->opr.oper){
case '+' :
if((analyse(&(p->opr.op[0])) == 1) && (analyse(&p->opr.op[1]) == 1)){
return 1;
}
printf("line %d : Invalid Data Type for '+' Operator \n",p->lineNumber);
return 0;
case '-' :
if((analyse(&(p->opr.op[0])) == 1) && (analyse(&p->opr.op[1]) == 1)){
return 1;
}
printf("line %d : Invalid Data Type for '-' Operator \n",p->lineNumber);
return 0;
case '*' :
if((analyse(&(p->opr.op[0])) == 1) && (analyse(&p->opr.op[1]) == 1)){
return 1;
}
printf("line %d : Invalid Data Type for '*' Operator \n",p->lineNumber);
return 0;
case '/' :
if((analyse(&(p->opr.op[0])) == 1) && (analyse(&p->opr.op[1]) == 1)){
return 1;
}
printf("line %d : Invalid Data Type for '/' Operator \n",p->lineNumber);
return 0;
case '%' :
if((analyse(&(p->opr.op[0])) == 1) && (analyse(&p->opr.op[1]) == 1)){
return 1;
}
printf("line %d : Invalid Data Type for 'mod' Operator \n",p->lineNumber);
return 0;
case '~' : if((analyse(&p->opr.op[0])==1)&&(analyse(&p->opr.op[1]) == 1)){
return 3;
}
else{
printf("line %d : Different Data types for '==' Operator \n",p->lineNumber);
return 0;
}
case '<' : if((analyse(&p->opr.op[0])==1)&&(analyse(&p->opr.op[1]) == 1)){
return 3;
}
else{
printf("line %d : Different Data types for '<' Operator \n",p->lineNumber);
return 0;
}
case '>' : if((analyse(&p->opr.op[0])==1)&&(analyse(&p->opr.op[1]) == 1)){
return 3;
}
else{
printf("line %d : Different Data types for '>' Operator \n",p->lineNumber);
return 0;
}
case '=' :
if((analyse(&p->opr.op[0]) == analyse(&p->opr.op[1]))&&(analyse(&p->opr.op[0]) != 0))
return 1;
else{
printf("line %d : Different Data types for '=' Operator Types are %d and %d\n",p->lineNumber,analyse(&p->opr.op[0]),analyse(&p->opr.op[1]));
return 0;
}
case 'R' :
if(getLocalVariableBinding(p->opr.op[0].id.name,currLocalTable) != 0){
p->opr.op[0].id.LsymbolPointer = getLocalTableEntry(p->opr.op[0].id.name,currLocalTable);
if(strcmp(p->opr.op[0].id.LsymbolPointer->type->name, "integer") == 0)
return 1;
else
printf("line %d : Invalid Read Operation \n",p->lineNumber);
}
else if(strcmp(p->opr.op[0].id.GsymbolPointer->type->name, "integer") == 0)
return 1;
return 0;
case 'W' :
if(analyse(&p->opr.op[0]) == 1)
return 1;
return 0;
case 'I' :
if(analyse(&(p->opr.op[0])) == 3){
if(p->opr.nops > 2)
return analyse(&(p->opr.op[1])) * analyse(&(p->opr.op[2]));
return analyse(&(p->opr.op[1]));
}
printf("line %d : Conditional Expression is not Boolean \n",p->lineNumber);
return 0;
case 'S' : return analyse(&(p->opr.op[0])) * analyse(&(p->opr.op[1]));
case 'L' : if(analyse(&(p->opr.op[0])) != 0){
return analyse(&(p->opr.op[1]));
}
return 0;
case '&' : if((analyse(&(p->opr.op[0])) == 3) && (analyse(&p->opr.op[1]) == 3)){
return 3;
}
printf("line %d : AND operator is for boolean expressions\n",p->lineNumber);
return 0;
case '|' : if((analyse(&(p->opr.op[0])) == 3) && (analyse(&p->opr.op[1]) == 3)){
return 3;
}
printf("line %d : OR operator is for boolean expressions\n",p->lineNumber);
return 0;
case '!' : if(analyse(&(p->opr.op[0])) == 3){
return 3;
}
printf("line %d : OR operator is for boolean expressions\n",p->lineNumber);
return 0;
case '^' :
if((analyse(&(p->opr.op[0])) == 3) && (strcmp(currFunction->type->name,"boolean") == 0)){
return 3;
}
else if((analyse(&(p->opr.op[0])) == 1) && (strcmp(currFunction->type->name,"integer") == 0)){
return 1;
}
else if((analyse(&(p->opr.op[0])) == 1) && (currFunction->type)){
return 1;
}
else{
printf("line %d : Invalid Return Type\n",p->lineNumber);
return 0;
}
case '@' :
if(analyse(&(p->opr.op[0])) == 1)
return 1;
else{
printf("line %d : invalid argument for readmem\n",p->lineNumber);
return 0;
}
case '#' :
if((analyse(&(p->opr.op[0])) == 1)&&(analyse(&(p->opr.op[1])) == 1))
return 1;
else{
printf("line %d : invalid argument for writemem\n",p->lineNumber);
return 0;
}
}
}
return 0;
}
int hasReturnState(struct nodeTypeTag *p){
if(p == NULL){
return 0;
}
switch(p->opr.oper){
case 'S' :
return hasReturnState(&(p->opr.op[0])) + hasReturnState(&(p->opr.op[1]));
case '^' : return 1;
/*
case 'I' :
if(&(p->opr.op[2])){
return hasReturnState(&(p->opr.op[1])) + hasReturnState(&(p->opr.op[2]));
}
else{
return hasReturnState(&(p->opr.op[1]));