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codegen.c
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/*
Group : 11
ID: 2020A7PS0297P NAME: Sarang Sridhar
ID: 2020A7PS0995P NAME: Kashish Mahajan
ID: 2020A7PS0993P NAME: Satvik Sinha
ID: 2020A7PS0036P NAME: Aarya Attrey
ID: 2020A7PS0017P NAME: Urvashi Sharma
*/
void initUninitialisedData(FILE* fp){ //to reserve memory for uninitialised data section: section.bss
fprintf(fp,"section .bss\n");
for(int i=0;i<count;i++){
quad temp = quadTable[i];
if(!strcasecmp(temp.op,"declare") && temp.result.arg.arg_var->is_array!=1){ //for non array elements
char* label = temp.result.arg.arg_var->id_lexeme;
fprintf(fp,"\t\t\t %s resb %d \n",label,temp.result.arg.arg_var->width); //storing width bytes for temporary
}
}
}
void initDataSection(FILE* fp){ //to store messages :section.data
fprintf(fp,"section .data\n");
fprintf(fp,"\t\t\t inputMsgInteger: db \"Enter an integer value\",0\n"); //for prompting the user to enter value
fprintf(fp,"\t\t\t trueMsg: db \"true\",0 \n");
fprintf(fp,"\t\t\t falseMsg: db \"false\",0 \n");
fprintf(fp,"\t\t\t format: db \"%%hi\",0 \n"); //this is for integer
fprintf(fp,"\t\t\t formatBool: db \"%%hhi\",0 \n"); // this is for boolean
fprintf(fp,"\t\t\t lineBreak: db 0ah\n");
}
void codegen(char * name){
FILE* fp = fopen(name,"w");
fprintf(fp,"global main\n");
fprintf(fp,"extern printf,scanf\n\n");
initDataSection(fp);
initUninitialisedData(fp);
fprintf(fp,"section .text\n");
fprintf(fp,"main:\n");
fprintf(fp,"\t\t\t push rbp\n");
fprintf(fp,"\t\t\t mov rbp,rsp\n");
fprintf(fp,"\t\t\t sub rsp,16\n");
for(int i=0;i<count;i++){
quad curr = quadTable[i];
if(!strcasecmp(curr.op,"=")){
//lval will be id
//rval will be a temporary
ST_ENTRY* lval = curr.result.arg.arg_var;
qEn rval = curr.arg1;
if(lval->is_array==0){
if(rval.entry==0){//rval is a temporary or a id
if(lval->width == 2){
fprintf(fp,"\t\t\t mov cx,[rbp - %d];moving rhs temporary/id:%s to temp reg rcx \n ",rval.arg.arg_var->offset,rval.arg.arg_var->id_lexeme);
fprintf(fp,"\t\t\t mov [rbp - %d],cx ;loading into %s's memory \n ",lval->offset,lval->id_lexeme);
}
else if(lval->width == 1){
fprintf(fp,"\t\t\t mov cl,[rbp - %d];moving rhs temporary/id:%s to temp reg rcx \n ",rval.arg.arg_var->offset,rval.arg.arg_var->id_lexeme);
fprintf(fp,"\t\t\t mov [rbp - %d],cl ;loading into %s's memory \n ",lval->offset,lval->id_lexeme);
}
else{
fprintf(fp,"\t\t\t mov ecx,[rbp - %d];moving rhs temporary/id:%s to temp reg rcx \n ",rval.arg.arg_var->offset,rval.arg.arg_var->id_lexeme);
fprintf(fp,"\t\t\t mov [rbp - %d],ecx ;loading into %s's memory \n ",lval->offset,lval->id_lexeme);
}
}
else if(rval.entry==1){ //rval is an int
fprintf(fp,"\t\t\t mov WORD [rbp - %d],%d ;loading into %s \n",lval->offset,rval.arg.arg_num,lval->id_lexeme);
}
else if(rval.entry==2){// rval is a float
fprintf(fp,"\t\t\t mov DWORD [rbp - %d],%lf \n",lval->offset,rval.arg.arg_rnum);
}
else if(rval.entry==3){ //rval is boolean
if(!strcasecmp(rval.arg.arg_bool,"true")){
fprintf(fp,"\t\t\t mov BYTE [rbp - %d],1 \n",lval->offset);
}
else{
fprintf(fp,"\t\t\t mov BYTE [rbp - %d],0 \n",lval->offset);
}
}
}
}
else if(!strcasecmp(curr.op,"PRINT")){\
int ent = curr.result.entry;
if(curr.label!=NULL)
fprintf(fp,"\t\t\t %s:\n ",curr.label);
if(ent == 0 && curr.result.arg.arg_var->is_array != 1)
{
if(ent == 0){
ST_ENTRY* var = curr.result.arg.arg_var;
if(var->is_array == 0){
fprintf(fp,"\t\t\t xor eax, eax \n ");
fprintf(fp,"\t\t\t mov esi,[rbp - %d]\n ",var->offset);
if(!strcasecmp(var->type.id_type.id_dt,"INTEGER"))
fprintf(fp,"\t\t\t lea rdi,[format]\n");
else if(!strcasecmp(var->type.id_type.id_dt,"BOOLEAN"))
fprintf(fp,"\t\t\t lea rdi,[formatBool]\n");
fprintf(fp,"\t\t\t call printf \n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
}
}
else if(ent == 1){
fprintf(fp,"\t\t\t xor eax, eax \n ");
fprintf(fp,"\t\t\t mov esi,%d\n",curr.result.arg.arg_num);
fprintf(fp,"\t\t\t lea rdi,[format]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
}
else if(ent == 2){
fprintf(fp,"\t\t\t xor eax, eax \n ");
fprintf(fp,"\t\t\t mov esi,%lf\n",curr.result.arg.arg_rnum);
fprintf(fp,"\t\t\t lea rdi,[format]\n");
fprintf(fp,"\t\t\t call printf \n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
}
else if(ent == 3){
if(!strcasecmp(curr.result.arg.arg_bool,"true")){
fprintf(fp,"\t\t\t xor eax, eax \n ");
fprintf(fp,"\t\t\t mov esi, trueMsg\n");
fprintf(fp,"\t\t\t call printf \n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
}
else{
fprintf(fp,"\t\t\t xor eax, eax \n ");
fprintf(fp,"\t\t\t mov esi, falseMsg\n");
fprintf(fp,"\t\t\t call printf \n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
}
}
}
else{
//array-case
ST_ENTRY* var = curr.arg1.arg.arg_var;
int off = curr.result.arg.arg_num;
fprintf(fp,"\t\t\t xor eax, eax \n ");
fprintf(fp,"\t\t\t mov esi,[rbp - %d]\n ",off);
if(!strcasecmp(var->type.arr_type.arr_dt,"INTEGER"))
fprintf(fp,"\t\t\t lea rdi,[format]\n");
else if(!strcasecmp(var->type.arr_type.arr_dt,"BOOLEAN"))
fprintf(fp,"\t\t\t lea rdi,[formatBool]\n");
fprintf(fp,"\t\t\t call printf \n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
}
}
else if(!strcmp(curr.op,"PLUS") ||!strcmp(curr.op,"MINUS") || !strcmp(curr.op,"MUL") || !strcmp(curr.op,"DIV")){
qEn leftOp = curr.arg1;
qEn rightOp = curr.arg2;
int realFlag=0;
//use rax for leftOp
if(leftOp.entry==0){
ST_ENTRY* t = leftOp.arg.arg_var;
if(!strcasecmp(t->type.id_type.id_dt,"REAL")){
realFlag=1;
}
fprintf(fp,"\t\t\t mov ax,[rbp-%d];moving leftop:%s from memory to ax \n ",t->offset,t->id_lexeme);
}
else if(leftOp.entry==1){
fprintf(fp,"\t\t\t mov ax,%d \n",leftOp.arg.arg_num);
}
else if(leftOp.entry==2){
realFlag = 1;
fprintf(fp,"\t\t\t mov ax,%lf \n",leftOp.arg.arg_rnum);
}
//use rbx for rightOp
if(rightOp.entry==0){
ST_ENTRY* t = rightOp.arg.arg_var;
if(!strcasecmp(t->type.id_type.id_dt,"REAL")){
realFlag=1;
}
fprintf(fp,"\t\t\t mov bx,[rbp-%d] ;moving %s from memory to rbx \n",t->offset,t->id_lexeme);
}
else if(rightOp.entry==1){
fprintf(fp,"\t\t\t mov bx,%d \n",rightOp.arg.arg_num);
}
else if(rightOp.entry==2){
realFlag=1;
fprintf(fp,"\t\t\t mov bx,%lf \n",rightOp.arg.arg_rnum);
}
//move into rcx the result
ST_ENTRY* res_temp = curr.result.arg.arg_var;
if(!strcmp(curr.op,"PLUS")){
fprintf(fp,"\t\t\t add ax,bx \n \t\t\t mov [rbp -%d],ax ;done for PLUS \n",res_temp->offset);
}
else if(!strcmp(curr.op,"MINUS")){
fprintf(fp,"\t\t\t sub ax,bx \n \t\t\t mov [rbp -%d],ax ;done for MINUS \n",res_temp->offset);
}
else if(!strcmp(curr.op,"MUL")){//check once
if(!realFlag)
fprintf(fp,"\t\t\t imul ax,bx \n \t\t\t mov [rbp -%d],ax ;done for mul\n",res_temp->offset);
}
else if(!strcmp(curr.op,"DIV")){
fprintf(fp,"\t\t\t div bx \n \t\t\t mov [rbp -%d],ax \n",res_temp->offset);
}
}
else if(!strcasecmp(curr.op, "AND") || !strcasecmp(curr.op,"OR")){
qEn leftOp = curr.arg1;
qEn rightOp = curr.arg2;
//loading left operand
if(leftOp.entry== 0){
ST_ENTRY* t = leftOp.arg.arg_var;
fprintf(fp,"\t\t\t mov al,[rbp-%d] \n",t->offset);
}
else if(leftOp.entry== 3){
if(!strcasecmp(leftOp.arg.arg_bool,"true")){
fprintf(fp,"\t\t\t mov al,1\n");
}
else if(!strcasecmp(leftOp.arg.arg_bool,"false")){
fprintf(fp,"\t\t\t mov al,0\n");
}
}
//loading right operand
if(rightOp.entry== 0){
ST_ENTRY* t = rightOp.arg.arg_var;
fprintf(fp,"\t\t\t mov bl,[rbp-%d]\n",t->offset);
}
else if(rightOp.entry== 3){
if(!strcasecmp(leftOp.arg.arg_bool,"true")){
fprintf(fp,"\t\t\t mov bl,1\n");
}
else if(!strcasecmp(rightOp.arg.arg_bool,"false")){
fprintf(fp,"\t\t\t mov bl,0\n");
}
}
//anding \ oring
if(!strcasecmp(curr.op,"AND")){
fprintf(fp,"\t\t\t and al,bl\n mov [rbp -%d],al\n",curr.result.arg.arg_var->offset);
}
else{
fprintf(fp,"\t\t\t or al,bl\n mov [rbp -%d],al\n",curr.result.arg.arg_var->offset);
}
}
else if(!strcasecmp(curr.op,"LT") ||!strcasecmp(curr.op,"<=") || !strcasecmp(curr.op,"LE") || !strcasecmp(curr.op,"GT") || !strcasecmp(curr.op,"GE") || !strcasecmp(curr.op,"NE") || !strcasecmp(curr.op,"EQ") || !strcasecmp(curr.op,"==")){
if(curr.instruction!=NULL && !strcasecmp(curr.instruction,"IF")){
qEn leftOp = curr.arg1;
qEn rightOp = curr.arg2;
int realFlag=0;
if(curr.label!=NULL)
fprintf(fp,"\t\t\t %s:\n ",curr.label);
if(leftOp.entry==0){
ST_ENTRY* t = leftOp.arg.arg_var;
if(t->is_array==0){
fprintf(fp,"\t\t\t mov ax,[rbp-%d] \n ",t->offset);
}
}
else if(leftOp.entry==1){
fprintf(fp,"\t\t\t mov ax,%d \n ",leftOp.arg.arg_num);
}
else if(leftOp.entry==2){
realFlag=1;
fprintf(fp,"\t\t\t mov xmm0,%lf \n ",leftOp.arg.arg_rnum);
}
if(rightOp.entry==0){
ST_ENTRY* t = rightOp.arg.arg_var;
if(t->is_array==0){
fprintf(fp,"\t\t\t mov bx,[rbp-%d] \n ",t->offset);
}
}
else if(rightOp.entry==1){
fprintf(fp,"\t\t\t mov bx,%d \n ",rightOp.arg.arg_num);
}
else if(rightOp.entry==2){
realFlag=1;
fprintf(fp,"\t\t\t mov xmm1,%lf \n ",rightOp.arg.arg_rnum);
}
fprintf(fp,"\t\t\t cmp ax,bx \n");
if(!strcasecmp(curr.op,"LT")){
fprintf(fp,"\t\t\t jl %s\n",curr.goTolabel);
}
else if(!strcasecmp(curr.op,"LE") || !strcasecmp(curr.op,"<=")){
fprintf(fp,"\t\t\t jle %s\n",curr.goTolabel);
}
else if(!strcasecmp(curr.op,"GT")){
fprintf(fp,"\t\t\t jg %s\n",curr.goTolabel);
}
else if(!strcasecmp(curr.op,"GE")){
fprintf(fp,"\t\t\t jge %s\n",curr.goTolabel);
}
else if(!strcasecmp(curr.op,"EQ") ||strcasecmp(curr.op,"==")){
fprintf(fp,"\t\t\t je %s\n",curr.goTolabel);
}
else if(!strcasecmp(curr.op,"NE")){
fprintf(fp,"\t\t\t jne %s\n",curr.goTolabel);
}
}
else{
qEn leftOp = curr.arg1;
qEn rightOp = curr.arg2;
int realFlag=0;
if(leftOp.entry==0){
ST_ENTRY* t = leftOp.arg.arg_var;
if(t->is_array==0){
fprintf(fp,"\t\t\t mov ax,[rbp-%d] \n ",t->offset);
}
}
else if(leftOp.entry==1){
fprintf(fp,"\t\t\t mov ax,%d \n ",leftOp.arg.arg_num);
}
else if(leftOp.entry==2){
realFlag=1;
fprintf(fp,"\t\t\t mov xmm0,%lf \n ",leftOp.arg.arg_rnum);
}
if(rightOp.entry==0){
ST_ENTRY* t = rightOp.arg.arg_var;
if(t->is_array==0){
fprintf(fp,"\t\t\t mov bx,[rbp-%d] \n ",t->offset);
}
}
else if(rightOp.entry==1){
fprintf(fp,"\t\t\t mov bx,%d \n ",rightOp.arg.arg_num);
}
else if(rightOp.entry==2){
realFlag=1;
fprintf(fp,"\t\t\t mov xmm1,%lf \n ",rightOp.arg.arg_rnum);
}
fprintf(fp,"\t\t\t cmp ax,bx \n");
if(!strcasecmp(curr.op,"LT")){
fprintf(fp,"\t\t\t setl [rbp - %d]\n",curr.result.arg.arg_var->offset);
}
else if(!strcasecmp(curr.op,"LE") || !strcasecmp(curr.op,"<=")){
fprintf(fp,"\t\t\t setle [rbp - %d]\n",curr.result.arg.arg_var->offset);
}
else if(!strcasecmp(curr.op,"GT")){
fprintf(fp,"\t\t\t setg [rbp - %d]\n",curr.result.arg.arg_var->offset);
}
else if(!strcasecmp(curr.op,"GE")){
fprintf(fp,"\t\t\t setge [rbp - %d]\n",curr.result.arg.arg_var->offset);
}
else if(!strcasecmp(curr.op,"EQ") || !strcasecmp(curr.op,"==")){
fprintf(fp,"\t\t\t sete [rbp - %d]\n",curr.result.arg.arg_var->offset);
}
else if(!strcasecmp(curr.op,"NE") || !strcasecmp(curr.op,"!=")){
fprintf(fp,"\t\t\t setne [rbp - %d]\n",curr.result.arg.arg_var->offset);
}
}
}
else if(curr.instruction!=NULL && !strcasecmp(curr.instruction,"GOTO")){
if(curr.label!=NULL)
fprintf(fp,"\t\t\t %s:\n ",curr.label);
fprintf(fp,"\t\t\t jmp %s\n",curr.goTolabel);
}
else if(curr.instruction!=NULL && !strcasecmp(curr.instruction,"INCREMENT")){
if(curr.label!=NULL)
fprintf(fp,"\t\t\t %s:\n ",curr.label);
fprintf(fp,"\t\t\t mov cx,[rbp - %d]\n",curr.arg1.arg.arg_var->offset);
fprintf(fp,"\t\t\t inc cx\n");
fprintf(fp,"\t\t\t mov [rbp - %d],cx\n",curr.arg1.arg.arg_var->offset);
}
else if(!strcasecmp(curr.op,"GET")){
qEn id = curr.arg1;
if(curr.label!=NULL)
fprintf(fp,"\t\t\t %s:\n ",curr.label);
if(id.arg.arg_var->is_array == 0){
//normal id hai
if(!strcasecmp(id.arg.arg_var->type.id_type.id_dt,"INTEGER")){
fprintf(fp,"\t\t\t xor eax, eax\n");
fprintf(fp,"\t\t\t lea rdi, [inputMsgInteger]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t mov eax,0\n");
fprintf(fp,"\t\t\t lea rdi, [format]\n");
fprintf(fp,"\t\t\t lea rsi, [rbp - %d]\n",id.arg.arg_var->offset);
fprintf(fp,"\t\t\t call scanf\n");
}
else if(!strcasecmp(id.arg.arg_var->type.id_type.id_dt,"BOOLEAN")){
fprintf(fp,"\t\t\t xor eax, eax\n");
fprintf(fp,"\t\t\t lea rdi, [inputMsgBoolean]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t mov eax,0\n");
fprintf(fp,"\t\t\t lea rdi, [formatBool]\n");
fprintf(fp,"\t\t\t lea rsi, [rbp - %d]\n",id.arg.arg_var->offset);
fprintf(fp,"\t\t\t call scanf\n");
}
}
else{
if(!strcasecmp(id.arg.arg_var->type.arr_type.arr_dt,"INTEGER")){
fprintf(fp,"\t\t\t xor eax, eax\n");
fprintf(fp,"\t\t\t lea rdi, [inputMsgInteger]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t mov eax,0\n");
fprintf(fp,"\t\t\t lea rdi, [formatBool]\n");
fprintf(fp,"\t\t\t lea rsi, [rbp - %d]\n",curr.result.arg.arg_num);
fprintf(fp,"\t\t\t call scanf\n");
}
else if(!strcasecmp(id.arg.arg_var->type.arr_type.arr_dt,"BOOLEAN")){
fprintf(fp,"\t\t\t xor eax, eax\n");
fprintf(fp,"\t\t\t lea rdi, [inputMsgBoolean]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t xor eax,eax\n");
fprintf(fp,"\t\t\t lea rdi,[lineBreak]\n");
fprintf(fp,"\t\t\t call printf\n");
fprintf(fp,"\t\t\t mov eax,0\n");
fprintf(fp,"\t\t\t lea rdi, [formatBool]\n");
fprintf(fp,"\t\t\t lea rsi, [rbp - %d]\n",curr.result.arg.arg_num);
fprintf(fp,"\t\t\t call scanf\n");
}
}
}
}
fprintf(fp,"\t\t\t return:\n");
fprintf(fp,"\t\t\t add rsp,16\n");
fprintf(fp,"\t\t\t leave\n");
fprintf(fp,"\t\t\t ret\n");
fclose(fp);
}