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Translator.java
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import visitor.GJDepthFirst;
import syntaxtree.*;
import java.util.*;
import java.io.*;
public class Translator extends GJDepthFirst<String, String> {
// symbol and virtual table
private Taburu taburu;
private V_Taburu v_taburu;
private FileWriter rothfuss;
public Translator(Taburu symboru, V_Taburu v_taburu1, FileWriter patrick){
this.taburu = symboru;
this.v_taburu = v_taburu1;
this.rothfuss = patrick;
}
// emit the LLVM type from the minijava type
private void emitType(String MJtype) throws Exception{
rothfuss.write(MJtoLL(MJtype));
}
// write to the file
private void emit (String write_this) throws Exception{
rothfuss.write(write_this);
}
// Because registers are single-assignment, you will probably need to
// keep a counter to produce new ones.
private int register_counter = 0;
// t stands for temporary registers (like riscv)
private String register(){
String typeR = "%_t"+register_counter;
register_counter+=1;
return typeR;
}
// minijava to LLVM type
private String MJtoLL(String MJtype){
// int, boolean, the struct arrays and pointer
if(MJtype.equals("int")) {
return "i32";
}
else if(MJtype.equals("boolean")) {
return "i1";
}
else if(MJtype.equals("int[]")) {
return "%_IntegerArray*";
}
else if(MJtype.equals("boolean[]")) {
return "%_BooleanArray*";
}
return "i8*";
}
// control flow label counters
private int label_counter = 0;
// beginning with LBL and then its number
private String label(){
String labelito = "LBL"+label_counter;
label_counter+=1;
return labelito;
}
/**
* f0 -> "class"
* f1 -> Identifier()
* f2 -> "{"
* f3 -> "public"
* f4 -> "static"
* f5 -> "void"
* f6 -> "main"
* f7 -> "("
* f8 -> "String"
* f9 -> "["
* f10 -> "]"
* f11 -> Identifier()
* f12 -> ")"
* f13 -> "{"
* f14 -> ( VarDeclaration() )*
* f15 -> ( Statement() )*
* f16 -> "}"
* f17 -> "}"
*/
@Override
public String visit(MainClass n, String argu) throws Exception {
String class_name = n.f1.accept(this, "business_as_usual");
// struct array declarations first
emit("%_IntegerArray = type { i32, [0 x i32] }\n");
emit("%_BooleanArray = type { i32, [0 x i1] }\n\n");
// then the classes virtual tables
for (String classNameVT: v_taburu.get_all_classes()){
emit("@."+classNameVT+"_vtable = global ["+ v_taburu.get_virtual_table(classNameVT).size() + " x i8*] \n[");
int count =0;
// for every method of this class
for (Map.Entry<String,String> entry : v_taburu.get_virtual_table(classNameVT).entrySet()) {
// to separate with comma
if (count!=0){
emit(",\n ");
}
count+=1;
// get the method type from the symbol table
emit("i8* bitcast (");
emitType(taburu.get_class(entry.getValue()).get_method_type(entry.getKey()));
emit(" (i8*");
// get the argument type from the symbol table
for(int i=0; i< taburu.get_class(entry.getValue()).get_arg_size(entry.getKey()); i++){
emit(", ");
emitType(taburu.get_class(entry.getValue()).get_arg_type(entry.getKey(), i));
}
// class name that method inherits from
emit(")* @"+ entry.getValue()+"."+entry.getKey()+" to i8*)");
}
emit("]\n\n");
}
// external method declarations
emit("declare i8* @calloc(i32, i32)\ndeclare i32 @printf(i8*, ...)\ndeclare void @exit(i32)\n\n@_cint = constant [4 x i8] c\"%d\\0a\\00\"\n");
emit("@_cOOB = constant [15 x i8] c\"Out of bounds\\0a\\00\"\n\ndefine void @print_int(i32 %i) {\n\t%_str = bitcast [4 x i8]* @_cint to i8*\n");
emit("\tcall i32 (i8*, ...) @printf(i8* %_str, i32 %i)\n\tret void\n}\n\ndefine void @throw_oob() {\n\t%_str = bitcast [15 x i8]* @_cOOB to i8*\n");
emit("\tcall i32 (i8*, ...) @printf(i8* %_str)\n\tcall void @exit(i32 1)\n\tret void\n}\n\n");
// define main
emit("define i32 @main() {\n");
// to emit them recursively
n.f14.accept(this, "main:imamethodof:"+class_name);
n.f15.accept(this, "main:imamethodof:"+class_name);
emit("\n\tret i32 0 \n} \n");
return null;
}
/**
* f0 -> "class"
* f1 -> Identifier()
* f2 -> "{"
* f3 -> ( VarDeclaration() )*
* f4 -> ( MethodDeclaration() )*
* f5 -> "}"
*/
@Override
public String visit(ClassDeclaration n, String argu) throws Exception {
String class_name = n.f1.accept(this, "business_as_usual");
// class name is needed for method declaration
n.f4.accept(this, class_name);
return null;
}
/**
* f0 -> "class"
* f1 -> Identifier()
* f2 -> "extends"
* f3 -> Identifier()
* f4 -> "{"
* f5 -> ( VarDeclaration() )*
* f6 -> ( MethodDeclaration() )*
* f7 -> "}"
*/
@Override
public String visit(ClassExtendsDeclaration n, String argu) throws Exception {
String class_name = n.f1.accept(this, null);
// class name is needed for method declaration
n.f6.accept(this, class_name);
return null;
}
/**
* f0 -> "public"
* f1 -> Type()
* f2 -> Identifier()
* f3 -> "("
* f4 -> ( FormalParameterList() )?
* f5 -> ")"
* f6 -> "{"
* f7 -> ( VarDeclaration() )*
* f8 -> ( Statement() )*
* f9 -> "return"
* f10 -> Expression()
* f11 -> ";"
* f12 -> "}"
*/
@Override
public String visit(MethodDeclaration n, String argu) throws Exception {
String my_class = argu;
String my_type = n.f1.accept(this, "business_as_usual");
String my_name = n.f2.accept(this, "business_as_usual");
// class name, method name and this in the LLVM standards
emit("\ndefine "+my_type+" @"+ my_class+"."+my_name+"(i8* %this");
// then the arguments
for(int i=0; i< taburu.get_class(my_class).get_arg_size(my_name); i++){
emit(", ");
emitType(taburu.get_class(my_class).get_arg_type(my_name, i));
emit(" %."+taburu.get_class(my_class).get_arg_name(my_name, i));
}
emit("){\n\n");
// alloca and store for the arguments
for(int i=0; i< taburu.get_class(my_class).get_arg_size(my_name); i++){
emit("\t%"+taburu.get_class(my_class).get_arg_name(my_name, i));
emit(" = alloca ");
emitType(taburu.get_class(my_class).get_arg_type(my_name, i));
emit("\n\tstore ");
emitType(taburu.get_class(my_class).get_arg_type(my_name, i));
emit(" %."+taburu.get_class(my_class).get_arg_name(my_name, i)+", ");
emitType(taburu.get_class(my_class).get_arg_type(my_name, i));
emit("* %"+taburu.get_class(my_class).get_arg_name(my_name, i)+"\n");
}
// var declarations
n.f7.accept(this, my_name + ":imamethodof:"+ argu);
// statements
n.f8.accept(this, my_name + ":imamethodof:"+ argu);
// expression to return
String hold_this = n.f10.accept(this, my_name + ":imamethodof:"+ argu);
// string manipulation to get the necessary information
String ret_type = hold_this.split(":")[2];
String ret_reg = hold_this.split(":")[0];
emit("\n\tret "+ret_type+ " "+ret_reg+" \n}\n");
return null;
}
/**
* f0 -> Type()
* f1 -> Identifier()
* f2 -> ";"
*/
@Override
public String visit(VarDeclaration n, String argu) throws Exception {
String my_type = n.f0.accept(this, "business_as_usual");
String my_name = n.f1.accept(this, "business_as_usual");
emit("\t%"+my_name+" = alloca "+my_type+"\n\tstore "+my_type+" ");
// Everything new in Java is initialized to zeroes.
if (my_type.equals("i1")||my_type.equals("i32")){
emit("0");
}
else {
emit("null");
}
if(!my_name.split(":")[0].contains("%"))
emit(", "+my_type+"* %"+my_name+"\n\n");
else
emit(", "+my_type+"* "+my_name+"\n\n");
return null;
}
/**
* f0 -> Identifier()
* f1 -> "="
* f2 -> Expression()
* f3 -> ";"
*/
public String visit(AssignmentStatement n, String argu) throws Exception {
String name = n.f0.accept(this, "business_as_usual");
// expression
String expr = n.f2.accept(this, argu);
// to get the register expression
String exp_reg = expr.split(":")[0];
String exp_type = expr.split(":")[2];
// try because these functions might throw an exception
try {
String var_type = taburu.find_me(name, argu);
String llt = MJtoLL(var_type);
int my_offset = taburu.find_my_offset(name, argu);
if(my_offset != -1 ){
String r1 = register();
String r2 = register();
// getelementptr is used to get the pointer to an element of an
// array from a pointer to that array and the index of the element.
// Example: %ptr_idx = getelementptr i8, i8* %ptr, i32 %idx
emit("\t"+r1+" = getelementptr i8, i8* %this, i32 "+ my_offset+"\n");
// bitcast is used to cast between different pointer types. It takes
// the value and type to be cast, and the type that it will be cast to.
// Example: %ptr = bitcast i32* %ptr2 to i8**
emit("\t"+r2+" = bitcast i8* "+r1+" to "+llt+"*\n");
emit("\tstore "+exp_type+" "+exp_reg+", "+ llt+"* "+r2+"\n\n");
// format for consistency "register:whereitcamefrom:i32:int"
return r2+":ASGNMNT:"+llt+":"+var_type;
}
if(!name.contains("%"))
emit("\tstore "+exp_type+" "+exp_reg+", "+ llt+"* %"+name+"\n\n");
else
emit("\tstore "+exp_type+" "+exp_reg+", "+ llt+"* "+name+"\n\n");
// format for consistency "register:whereitcamefrom:i32:int"
return name+":ASGNMNT:"+llt+":"+var_type;
} catch (Exception e) {
return "Error in assignment.";
}
}
/**
* f0 -> Identifier()
* f1 -> "["
* f2 -> Expression()
* f3 -> "]"
* f4 -> "="
* f5 -> Expression()
* f6 -> ";"
*/
public String visit(ArrayAssignmentStatement n, String argu) throws Exception {
// to get the indentifier name
String array_ident = n.f0.accept(this, argu);
String array_index = n.f2.accept(this, argu);
String assgnmt_expr = n.f5.accept(this, argu);
// two labels for negative check
String l1 = label();
String l2 = label();
// two labels for within bounds check
String l3 = label();
String l4 = label();
// registers
String t1 = register();
String t5 = register();
String t6 = register();
String t7 = register();
String t8 = register();
// identifier register
String id_reg = array_ident.split(":")[0];
// index register or the literal itself
String ar_indx_reg = array_index.split(":")[0];
// assignment register
String assgnmt_reg = assgnmt_expr.split(":")[0];
if(array_ident.split(":")[3].equals("boolean[]")){
// negative check >=0
emit("\t"+t1+" = icmp sge i32 "+ar_indx_reg+", 0\n");
emit("\tbr i1 "+t1+", label %"+l2+ ", label %"+l1 +"\n\n");
// l1 that its negative
emit(l1+":\n");
emit("\tcall void @throw_oob()\n\tbr label %"+l2+"\n\n");
// label second its not
emit(l2+":\n");
// to get the first struct element
emit("\t"+t5+" = getelementptr %_BooleanArray, %_BooleanArray* "+id_reg+", i32 0, i32 0 \n");
// t6 the size of Identifier array
emit("\t"+t6+" = load i32, i32* "+t5+"\n\n");
// check index < array size
emit("\t"+t7+" = icmp slt i32 "+ar_indx_reg+", "+ t6+"\n");
emit("\tbr i1 "+t7+", label %"+l4+ ", label %"+l3 +"\n\n");
// label l3 out of bounds
emit(l3+":\n");
emit("\tcall void @throw_oob()\n\tbr label %"+l4+"\n\n");
// label l4 in bounds
emit(l4+":\n");
// store it
emit("\t"+t8+ " = getelementptr %_BooleanArray, %_BooleanArray* "+id_reg+", i32 0, i32 1, i32 "+ar_indx_reg+"\n\n");
emit("\t store i1 "+assgnmt_reg+", i1* "+t8+"\n\n");
}
// for integer array
else{
// negative check >=0
emit("\t"+t1+" = icmp sge i32 "+ar_indx_reg+", 0\n");
emit("\tbr i1 "+t1+", label %"+l2+ ", label %"+l1 +"\n\n");
// label l1 negative
emit(l1+":\n");
emit("\tcall void @throw_oob()\n\tbr label %"+l2+"\n\n");
// label l2 its not
emit(l2+":\n");
// first struct element
emit("\t"+t5+" = getelementptr %_IntegerArray, %_IntegerArray* "+id_reg+", i32 0, i32 0 \n");
// t6 the size of Identifier array
emit("\t"+t6+" = load i32, i32* "+t5+"\n\n");
// check index < array size
emit("\t"+t7+" = icmp slt i32 "+ar_indx_reg+", "+ t6+"\n");
emit("\tbr i1 "+t7+", label %"+l4+ ", label %"+l3 +"\n\n");
// label l3 out of bounds
emit(l3+":\n");
emit("\tcall void @throw_oob()\n\tbr label %"+l4+"\n\n");
// label l4 in bounds
emit(l4+":\n");
// store it
emit("\t"+t8+ " = getelementptr %_IntegerArray, %_IntegerArray* "+id_reg+", i32 0, i32 1, i32 "+ar_indx_reg+"\n\n");
emit("\t store i32 "+assgnmt_reg+", i32* "+t8+"\n\n");
}
return null;
}
/**[]
* f0 -> "if"
* f1 -> "("
* f2 -> Expression()
* f3 -> ")"
* f4 -> Statement()
* f5 -> "else"
* f6 -> Statement()
*/
public String visit(IfStatement n, String argu) throws Exception {
String expr= n.f2.accept(this, argu);
// no need to check that its boolean (done it in the typechecker visitor)
String eReg = expr.split(":")[0];
String l1_exit = label();
String l2_true = label();
String l3_false = label();
emit("\tbr i1 "+eReg+", label %"+l2_true+", label %"+l3_false+"\n\n");
// l2 label
emit(l2_true+":\n");
n.f4.accept(this, argu);
emit("\tbr label %"+l1_exit+"\n");
// l3 label
emit(l3_false+":\n");
// statement
n.f6.accept(this, argu);
emit("\tbr label %"+l1_exit+"\n");
// l1 label
emit(l1_exit+":\n");
return null;
}
/**
* f0 -> "while"
* f1 -> "("
* f2 -> Expression()
* f3 -> ")"
* f4 -> Statement()
*/
public String visit(WhileStatement n, String argu) throws Exception {
String l1_while = label();
String l2_true = label();
String l3_false = label();
emit("\tbr label %"+l1_while+"\n");
// l1 label
emit(l1_while+":\n");
// no need to check that its boolean (done it in the typechecker visitor)
String expr= n.f2.accept(this, argu);
// get the register
String eReg = expr.split(":")[0];
// WHILE TRUE l2 else l3
emit("\tbr i1 " + eReg+", label %"+l2_true +", label %"+ l3_false+"\n\n");
// l2 label
emit(l2_true+":\n");
// statement
n.f4.accept(this, argu);
// continue to condition
emit("\tbr label %"+l1_while+"\n");
// l3 label
emit(l3_false+":\n");
return null;
}
/**
* f0 -> "System.out.println"
* f1 -> "("
* f2 -> Expression()
* f3 -> ")"
* f4 -> ";"
*/
public String visit(PrintStatement n, String argu) throws Exception {
String _ret = n.f2.accept(this, argu);
String register_part = _ret.split(":")[0];
// since print only allows integers
emit("\tcall void (i32) @print_int(i32 " + register_part + ")\n\n");
return null;
}
/**
* f0 -> Expression()
* f1 -> ExpressionTail()
*/
public String visit(ExpressionList n, String argu) throws Exception {
String expr = n.f0.accept(this, argu);
if (n.f1!=null) expr+= n.f1.accept(this, argu);
return expr;
}
/**
* f0 -> ( ExpressionTerm() )*
*/
public String visit(ExpressionTail n, String argu) throws Exception {
String expr = "";
// similar to the typechecker
for (Node nodo : n.f0.nodes)
expr += "," +nodo.accept(this, argu);
return expr;
}
/**
* f0 -> ","
* f1 -> Expression()
*/
public String visit(ExpressionTerm n, String argu) throws Exception {
return n.f1.accept(this, argu);
}
/**
* f0 -> "this"
*/
public String visit(ThisExpression n, String argu) throws Exception {
// get the class name
String[] bettersafethansorry = argu.split(":imamethodof:");
return "%this:THIS:i8*:"+bettersafethansorry[1];
}
/**
* f0 -> "new"
* f1 -> "boolean"
* f2 -> "["
* f3 -> Expression()
* f4 -> "]"
*/
public String visit(BooleanArrayAllocationExpression n, String argu) throws Exception {
String expr = n.f3.accept(this, argu);
String t1 = register();
String t2 = register();
String t3 = register();
String t4 = register();
String t5 = register();
String l1 = label();
String l2 = label();
// get the size first
String arraysize = expr.split(":")[0];
// negative check
emit("\t"+t1+" = icmp sge i32 "+arraysize+", 0\n");
emit("\tbr i1 "+t1+", label %"+l2+ ", label %"+l1 +"\n\n");
// label l1 negative
emit(l1+":\n");
emit("\tcall void @throw_oob()\n\tbr label %"+l2+"\n\n");
// label l2 all good
emit(l2+":\n");
// +4 array size
emit("\t"+t4+" = add i32 4, " +arraysize+"\n");
emit("\t"+t2 +" = call i8* @calloc(i32 "+t4+", i32 1)\n");
emit("\t"+t3 +" = bitcast i8* "+t2+" to %_BooleanArray*\n");
// first index of array
emit("\t"+t5+" = getelementptr %_BooleanArray, %_BooleanArray* "+t3+", i32 0, i32 0\n");
emit("\tstore i32 "+arraysize+", i32* "+ t5 +"\n\n");
return t3+":ALOC:%_BooleanArray*:boolean[]";
}
/**
* f0 -> "new"
* f1 -> "int"
* f2 -> "["
* f3 -> Expression()
* f4 -> "]"
*/
public String visit(IntegerArrayAllocationExpression n, String argu) throws Exception {
String expr = n.f3.accept(this, argu);
String t1 = register();
String t2 = register();
String t3 = register();
String t4 = register();
String t5 = register();
String l1 = label();
String l2 = label();
// get the size
String arraysize = expr.split(":")[0];
// negative check
emit("\t"+t1+" = icmp sge i32 "+arraysize+", 0\n");
emit("\tbr i1 "+t1+", label %"+l2+ ", label %"+l1 +"\n\n");
// label l1 negative
emit(l1+":\n");
emit("\tcall void @throw_oob()\n\tbr label %"+l2+"\n\n");
// label l2 its not
emit(l2+":\n");
// to +1 sto array size
emit("\t"+t4+" = add i32 1, " +arraysize+"\n");
emit("\t"+t2 +" = call i8* @calloc(i32 "+t4+", i32 4)\n");
emit("\t"+t3 +" = bitcast i8* "+t2+" to %_IntegerArray*\n");
// first array index
emit("\t"+t5+" = getelementptr %_IntegerArray, %_IntegerArray* "+t3+", i32 0, i32 0\n");
emit("\tstore i32 "+arraysize+", i32* "+ t5 +"\n\n");
return t3+":ALOC:%_IntegerArray*:int[]";
}
/**
* f0 -> "new"
* f1 -> Identifier()
* f2 -> "("
* f3 -> ")"
*/
public String visit(AllocationExpression n, String argu) throws Exception {
String class_name = n.f1.accept(this, "business_as_usual");
// to get size add 8 on the last offset
int class_size = taburu.get_class(class_name).getVar_offset() + 8;
// method count from the virtual table
int method_size = v_taburu.get_method_count(class_name);
String t1 = register();
String t2 = register();
String t3 = register();
emit("\t"+t1+" = call i8* @calloc(i32 1, i32 " + class_size+ ")\n");
emit("\t"+t2+" = bitcast i8* "+t1+ " to i8***\n");
emit("\t"+t3+" = getelementptr ["+method_size +" x i8*]"+", ["+ method_size +" x i8*]* @."+class_name+"_vtable, i32 0, i32 0\n");
emit("\tstore i8** "+t3+ ", i8*** "+t2+"\n\n");
return t1+":ALOC:i8*:"+class_name;
}
/**
* f0 -> "!"
* f1 -> Clause()
*/
public String visit(NotExpression n, String argu) throws Exception {
String _ret = n.f1.accept(this, argu);
String t1 = register();
String id = _ret.split(":")[0];
emit("\t"+t1+" = xor i1 1, "+id+"\n\n");
return t1+":CLAUSE:i1:boolean";
}
/**
* f0 -> "("
* f1 -> Expression()
* f2 -> ")"
*/
public String visit(BracketExpression n, String argu) throws Exception {
String _ret = n.f1.accept(this, argu);
return _ret;
}
// Identifier returns string or emits accordingly
@Override
public String visit(Identifier n, String argu) {
String ident = n.f0.toString();
// case to return string
if (argu==null||argu.equals("business_as_usual"))
return ident;
// else it's a variable that I have to emit code
try {
String var_type = taburu.find_me(ident, argu);
String llt = MJtoLL(var_type);
int my_offset = taburu.find_my_offset(ident, argu);
if(my_offset != -1 ){
String r1 = register();
String r2 = register();
String r3 = register();
// getelementptr is used to get the pointer to an element of an
// array from a pointer to that array and the index of the element.
// Example: %ptr_idx = getelementptr i8, i8* %ptr, i32 %idx
emit("\t"+r1+" = getelementptr i8, i8* %this, i32 "+ my_offset+"\n");
// bitcast is used to cast between different pointer types. It takes
// the value and type to be cast, and the type that it will be cast to.
// Example: %ptr = bitcast i32* %ptr2 to i8**
emit("\t"+r2+" = bitcast i8* "+r1+" to "+llt+"*\n");
// load is used to load a value from a memory location. The
// parameters are the type of the value and a pointer to the memory.
// Example: %val = load i32, i32* %ptr
emit("\t"+r3+" = load "+llt +", " + llt+"* "+r2+"\n\n");
// format "register:whereicamefrom:int:i32:"
return r3+":ID:"+llt+":"+var_type;
}
// if not make a new register
String r1 = register();
// Example: %val = load i32, i32* %ptr
emit("\t"+r1+" = load "+llt +", " + llt+"* %"+ident+"\n\n");
// format "register:whereicamefrom:int:i32:"
return r1+":ID:"+llt+":"+var_type;
} catch (Exception e) {
return "Error in Identifier.";
}
}
/**
* f0 -> ArrayType()
* | BooleanType()
* | IntegerType()
* | Identifier()
*/
public String visit(Type n, String argu) throws Exception {
if (n.f0.which==3) return "i8*";
// else return one of the other types
return n.f0.accept(this, argu);
}
/**
* f0 -> BooleanArrayType()
* | IntegerArrayType()
*/
public String visit(ArrayType n, String argu) throws Exception {
return n.f0.accept(this, argu);
}
public String visit(BooleanArrayType n, String argu) {
return "%_BooleanArray*";
}
public String visit(IntegerArrayType n, String argu) {
return "%_IntegerArray*";
}
public String visit(BooleanType n, String argu) {
return "i1";
}
public String visit(IntegerType n, String argu) {
return "i32";
}
/**
* f0 -> "INTEGER_LITERAL"
*/
public String visit(IntegerLiteral n, String argu) throws Exception {
return n.f0.tokenImage+":LITERAL:i32:int";
}
/**
* f0 -> "true"
*/
public String visit(TrueLiteral n, String argu) throws Exception {
return "1:LITERAL:i1:boolean";
}
/**
* f0 -> "false"
*/
public String visit(FalseLiteral n, String argu) throws Exception {
return "0:LITERAL:i1:boolean";
}
/**
* f0 -> Clause()
* f1 -> "&&"
* f2 -> Clause()
*/
public String visit(AndExpression n, String argu) throws Exception {
// Here we instruct the phi instruction to choose %a if the previous
// basic block was %btrue. If the previous basic block was %bfalse,
// then %b will be used. The value is then assigned to a new variable %retval.
// %retval = phi i32 [%a, %btrue], [%b, %bfalse]
// first do the first clause
String clause_L = n.f0.accept(this, argu);
String reg1 = clause_L.split(":")[0];
// three labels for it
String l1 = label();
String l2 = label();
String l3 = label();
// reg1: the i1 of the first clause
emit("\tbr i1 "+reg1+", label %"+l2+", label %"+l1+"\n");
// LABEL 1
emit(l1+":\n");
// if false go to phi
emit("\tbr label %"+l3+"\n");
// LABEL 2
emit(l2+":\n");
// do the second clause
String clause_R = n.f2.accept(this, argu);
String reg2 = clause_R.split(":")[0];
// go to phi
emit("\tbr label %"+l3+"\n");
// LABEL 3
emit(l3+":\n");
String t1 = register();
// if Im here from label 1 false, if from label 2 just return reg2 value
emit("\t"+t1+" = phi i1 [ false, %"+l1 +"], [ "+reg2+", %"+l2+" ]\n\n");
return t1+":AND:i1:boolean";
}
/**
* f0 -> PrimaryExpression()
* f1 -> "<"
* f2 -> PrimaryExpression()
*/
public String visit(CompareExpression n, String argu) throws Exception {
String prima_L = n.f0.accept(this, argu);
String prima_R = n.f2.accept(this, argu);
// get the registers
String reg1 = prima_L.split(":")[0];
String reg2 = prima_R.split(":")[0];
String t1 = register();
// compare with icmp
emit("\t"+t1+" = icmp slt i32 "+reg1+", "+reg2+"\n\n");
return t1+":LESS:i1:boolean";
}
/**
* f0 -> PrimaryExpression()
* f1 -> "+"
* f2 -> PrimaryExpression()
*/
public String visit(PlusExpression n, String argu) throws Exception {
String prima_L = n.f0.accept(this, argu);
String prima_R = n.f2.accept(this, argu);
// get the registers
String reg1 = prima_L.split(":")[0];
String reg2 = prima_R.split(":")[0];
String t1 = register();
// add them
emit("\t"+t1+" = add i32 "+reg1+", "+reg2+"\n\n");
return t1+":PLUS:i32:int";
}
/**
* f0 -> PrimaryExpression()
* f1 -> "-"
* f2 -> PrimaryExpression()
*/
public String visit(MinusExpression n, String argu) throws Exception {
String prima_L = n.f0.accept(this, argu);
String prima_R = n.f2.accept(this, argu);
// get the registers
String reg1 = prima_L.split(":")[0];
String reg2 = prima_R.split(":")[0];
String t1 = register();
// subtract
emit("\t"+t1+" = sub i32 "+reg1+", "+reg2+"\n\n");
return t1+":MINUS:i32:int";
}
/**
* f0 -> PrimaryExpression()
* f1 -> "*"
* f2 -> PrimaryExpression()
*/
public String visit(TimesExpression n, String argu) throws Exception {
String prima_L = n.f0.accept(this, argu);
String prima_R = n.f2.accept(this, argu);
String reg1 = prima_L.split(":")[0];
String reg2 = prima_R.split(":")[0];
String t1 = register();
// multiply with mul
emit("\t"+t1+" = mul i32 "+reg1+", "+reg2+"\n\n");
return t1+":MULTI:i32:int";
}
/**
* f0 -> PrimaryExpression()
* f1 -> "["
* f2 -> PrimaryExpression()