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codegen.cpp
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#include "ast.hpp"
#include "symbol.hpp"
#include "error.hpp"
#include "general.hpp"
#include <iostream>
#include <fstream>
#define forCurrentScope(e) for(SymbolEntry* e = currentScope->entries; e != NULL; e = e->nextInScope)
#define llvmPointer(inner) llvm::PointerType::get(inner, 0)
//====================================================================================//
// Initialization of Globals for Codegen //
//====================================================================================//
llvm::LLVMContext AST::TheContext;
std::unique_ptr<llvm::Module> AST::TheModule = std::make_unique<llvm::Module>("mainprogram", TheContext);
std::unique_ptr<llvm::legacy::FunctionPassManager> AST::TheFPM = std::make_unique<llvm::legacy::FunctionPassManager>(TheModule.get());
std::unique_ptr<llvm::IRBuilder<> > AST::Builder = std::make_unique<llvm::IRBuilder<> >(TheContext);
llvm::Type* AST::i8 = llvm::IntegerType::get(TheContext, 8);
llvm::Type* AST::i16 = llvm::IntegerType::get(TheContext, 16);
llvm::Type* AST::i8p = llvm::PointerType::get(i8, 0);
llvm::Type* AST::i64 = llvm::IntegerType::get(TheContext, 64);
llvm::Function* AST::newF = llvm::Function::Create(
llvm::FunctionType::get(AST::i8p,{AST::i16},false),
llvm::Function::ExternalLinkage,
"_newF",
*AST::TheModule
);
llvm::Function* AST::deleteF = llvm::Function::Create(
llvm::FunctionType::get(llvm::Type::getVoidTy(AST::TheContext),{AST::i8p},false),
llvm::Function::ExternalLinkage,
"_deleteF",
*AST::TheModule
);
//====================================================================================//
// Root Of Code Generation //
//====================================================================================//
llvm::Value* Program::codegen(){
if (optimize_flag){
TheFPM->add(llvm::createPromoteMemoryToRegisterPass());
TheFPM->add(llvm::createInstructionCombiningPass());
TheFPM->add(llvm::createReassociatePass());
TheFPM->add(llvm::createGVNPass());
TheFPM->add(llvm::createCFGSimplificationPass());
}
TheFPM->doInitialization();
this->sem();
//==========================================================//
// Main Wrapper for exiting to system with exit code 0 //
//==========================================================//
llvm::Function* ProgramMain;
llvm::Function* main =
llvm::Function::Create(
llvm::FunctionType::get(i8, {}, false),
llvm::Function::ExternalLinkage,
"main",
*TheModule
);
llvm::BasicBlock *FB = llvm::BasicBlock::Create(TheContext, "entry", main);
Builder->SetInsertPoint(FB);
forCurrentScope(e)
if(e->entryType == ENTRY_FUNCTION && std::string(e->id) == "main")
if(! e->u.eFunction.isForward)
ProgramMain = e->u.eFunction.fun;
Builder->CreateCall(ProgramMain, {});
Builder->CreateRet(c8(0));
closeScope();
//==========================================================
//==========================================================
//==========================================================
bool bad = verifyModule(*TheModule, &llvm::errs());
if(bad){
fatal("Failed to verify module");
}
destroySymbolTable();
return nullptr;
}
llvm::Value* VariableDeclaration::codegen(){
SymbolEntry * e = lookupEntry(this->_name.c_str(), LOOKUP_ALL_SCOPES, false);
if(e->nestingLevel == GLOBAL_SCOPE){
// this is a global variable!!
// getNewGlobalVariable in LLVM
auto tt = this->_typeExpr->toType();
llvm::Value* val = new llvm::GlobalVariable(
*TheModule,
toLLVMType(tt),
false,
llvm::GlobalValue::CommonLinkage,
llvm::ConstantAggregateZero::get(toLLVMType(tt)),
this->_name
);
e->u.eVariable.llvmVal = val;
destroyType(tt);
}else{
// the offset will suffice
// this offset if fixed in the symbol table by calling it
}
return nullptr;
}
llvm::Value* ArrayDeclaration::codegen(){
SymbolEntry * e = lookupEntry(this->_name.c_str(), LOOKUP_ALL_SCOPES, false);
if(e->nestingLevel == GLOBAL_SCOPE){
// this is a global variable!!
// getNewGlobalVariable in LLVM
auto tt = this->_typeExpr->toType();
llvm::Value* val = new llvm::GlobalVariable(
*TheModule,
llvm::ArrayType::get(toLLVMType(tt),this->_expr->isIntConstant()),
false,
llvm::GlobalValue::CommonLinkage,
llvm::ConstantAggregateZero::get(llvm::ArrayType::get(toLLVMType(tt),this->_expr->isIntConstant())),
this->_name
);
e->u.eVariable.llvmVal = val;
destroyType(tt);
}else{
// the offset will suffice
// this offset if fixed in the symbol table by calling it
}
return nullptr;
}
/**
* @brief Declare the function In the llvm::TheModule.
*
*/
void FunctionHead::declare(){
// Get the Function to put in Symbol Table
// If this is a nested Function then it needs to have an extra argument
// of type i8* which is the %env.
SymbolEntry * e = lookupEntry(this->getName().c_str(), LOOKUP_ALL_SCOPES, false);
std::vector<llvm::Type*> parameterTypes;
if(e->nestingLevel > GLOBAL_SCOPE){
// we are a nested function so we need an extra argument
// for the environment... i8*
//
parameterTypes.push_back(llvm::PointerType::get(i8, 0));
}
// Get the types for all parameters
for (auto &par : this->_parameters->_parameters){
auto tt = par->getType()->toType();
if(par->getPassingWay() == Parameter::PassingWay::ByRef){
parameterTypes.push_back(llvmPointer(toLLVMType(tt)));
}else
parameterTypes.push_back(toLLVMType(tt));
destroyType(tt);
}
auto tt = this->_resultType->toType();
if (!e->u.eFunction.hasHead){
// Change the name if main to _main because it is wrapped to return with 0 to system.
// See Program::codegen
llvm::Function* f =
llvm::Function::Create(
llvm::FunctionType::get(toLLVMType(tt),
parameterTypes, false),
llvm::Function::ExternalLinkage,
this->getName() == "main" ? "_main" : this->getName(),
*TheModule
);
e->u.eFunction.fun = f;
e->u.eFunction.hasHead = true;
}
destroyType(tt);
}
llvm::Value* FunctionDeclaration::codegen() {
this->declare();
return nullptr;
}
llvm::Value* FunctionDefinition::codegen(){
// If we have defined it, aka FunctionDeclaration, then on the symbol table
// is the llvm::Function for it. So just grab it.
SymbolEntry * e = lookupActiveFun();
llvm::Function* f;
f = e->u.eFunction.fun;
// Begin the first block of the function!!
llvm::BasicBlock *FB = llvm::BasicBlock::Create(TheContext, "entry", f);
Builder->SetInsertPoint(FB);
// Build the LocalEnv!!
// If we are at 0 nesting level -> no previous static link needs to be stored
// If we are a nesting function -> store the previous static link given as argument to local env[0];
size_t offset = currentScope->varOffset;
llvm::Value* env = Builder->CreateAlloca(i8, 0, c64(offset), "env");
e->u.eFunction.env = env;
// f : llvm::Function "name" ([env], arguments)
// On symbol table there is
// e "name" (pars)
/*
* if nested:
* localenv[0] = previousenv;
* localenv[8] = firstParameter;
* localenv[8+sizeof(firstParameter)] = secondParameter
* ...
*
* if not nested:
* localenv[0] = firstParameter
* localenv[0+sizeof(firstParameter)] = secondParameter
* ...
*/
auto realArg = f->arg_begin();
if ( e->nestingLevel > GLOBAL_SCOPE ){
realArg->setName("prevEnv");
// i8* env;
// i8* prevEnv;
// ((i8**)env)[0] = prevEnv
// ptrToStore = env + 0;
// * ((i8**) ptrToStore) = prevEnv;
// %env_0 = getelementptr i8, i8* %env, i16 0
auto env_0 = Builder->CreateGEP(env, c64(0), "env.0");
// %env_01 = bitcast i8* env_0 to i8**
auto env_01 = Builder->CreateBitCast(env_0, llvm::PointerType::get(realArg->getType(), 0), "env.0.casted");
// store i8* %prevEnv, i8** %env_01;
Builder->CreateStore(realArg, env_01);
realArg++;
}
for (auto par = e->u.eFunction.firstArgument; par!= NULL && realArg != f->arg_end(); realArg++, par = par->u.eParameter.next){
realArg->setName(par->id);
// put it in the context
auto argLevel = Builder->CreateGEP(env, c64(par->u.eParameter.offset), "env.0");
auto argLevelCasted = Builder->CreateBitCast(argLevel, llvm::PointerType::get(realArg->getType(), 0), "env.0.casted");
Builder->CreateStore(realArg, argLevelCasted);
}
this->_statements->codegen();
auto tt = this->_resultType->toType();
if ( equalType(tt, typeVoid) ){
Builder->CreateRetVoid();
}else{
// this means that the last block of a non void returning function is not terminated
// control will never reach here because all returns should have been called before getting
// to this part. Thus this is dead code and will be removed by the analysis
// This creates errors if the last block has a phi because llvm needs to know all paths that get there
// so a trap block is better.
llvm::BasicBlock *LB = llvm::BasicBlock::Create(TheContext, "lastBlock", f);
Builder->CreateBr(LB);
Builder->SetInsertPoint(LB);
Builder->CreateBr(LB);
}
destroyType(tt);
// Oprimize the Function
TheFPM->run(*f);
return nullptr;
}
//====================================================================================//
// Unused //
//====================================================================================//
llvm::Value* TypeExpression::codegen(){
return nullptr;
}
llvm::Value* Parameter::codegen(){
return nullptr;
}
llvm::Value* ParameterList::codegen(){
return nullptr;
}
llvm::Value* BasicType::codegen(){
return nullptr;
}
llvm::Value* Pointer::codegen(){
return nullptr;
}
//====================================================================================//
// Code Generation Of Statements //
//====================================================================================//
llvm::Value* EmptyStatement::codegen(){
return nullptr;
}
llvm::Value* SingleExpression::codegen(){
this->_expr->codegen();
return nullptr;
}
llvm::Value* IfStatement::codegen(){
// description of Operation:
// condition = this->_condition->codegen()
// conidtion is i8 aka boolean
// conditionEval = icmp ne i8 condition, 0
// br i1 conditionEval, label trueLabel, label Endif
SymbolEntry * e = lookupActiveFun();
llvm::Function* f = e->u.eFunction.fun;
// Basic Blocks for Jumping
llvm::BasicBlock *TrueBlock = llvm::BasicBlock::Create(TheContext, "iftrue", f);
llvm::BasicBlock *EndIfBlock = llvm::BasicBlock::Create(TheContext, "endif", f);
llvm::Value* conditionVal = this->_condition->codegen();
auto condBit = Builder->CreateICmpNE(conditionVal, c8(0), "cond");
Builder->CreateCondBr(condBit, TrueBlock, EndIfBlock);
// Build If body;
Builder->SetInsertPoint(TrueBlock);
this->_ifbody->codegen();
Builder->CreateBr(EndIfBlock);
// Go to EndIfBlock
Builder->SetInsertPoint(EndIfBlock);
return nullptr;
}
llvm::Value* IfElseStatement::codegen(){
SymbolEntry * e = lookupActiveFun();
llvm::Function * f = e->u.eFunction.fun;
// Basic Blocks for Jumping
llvm::BasicBlock * IfTrueBlock = llvm::BasicBlock::Create(TheContext, "iftrue", f);
llvm::BasicBlock * IfFalseBlock = llvm::BasicBlock::Create(TheContext, "iffalse", f);
llvm::BasicBlock * EndIfBlock = llvm::BasicBlock::Create(TheContext, "endif", f);
llvm::Value * conditionVal = this->_condition->codegen();
auto condBit = Builder->CreateICmpNE(conditionVal, c8(0), "cond");
Builder->CreateCondBr(condBit, IfTrueBlock, IfFalseBlock);
// Build If body;
Builder->SetInsertPoint(IfTrueBlock);
this->_ifbody->codegen();
Builder->CreateBr(EndIfBlock);
// Build Else body;
Builder->SetInsertPoint(IfFalseBlock);
this->_elsebody->codegen();
Builder->CreateBr(EndIfBlock);
// Go to EndIfBlock
Builder->SetInsertPoint(EndIfBlock);
return nullptr;
}
llvm::Value* ForStatement::codegen(){
// label: for(ex1 ; ex2; ex3)
// statement
/*
* ex1;
* goto loophead:
* loophead:
* ex2;
* if (ex2 == true) goto loopbody else goto endfor
*
* loopbody:
* statement
* goto loopafter
*
* loopafter:
* ex3;
* goto loophead
*
* endfor:
*/
SymbolEntry * e = lookupActiveFun();
llvm::Function * f = e->u.eFunction.fun;
SymbolEntry * lblEntry= lookupLabel(this->_label->getLabelName().c_str(), true);
llvm::BasicBlock * LoopHeadBlock = llvm::BasicBlock::Create(TheContext, "loophead", f);
llvm::BasicBlock * LoopBodyBlock = llvm::BasicBlock::Create(TheContext, "loopbody", f);
llvm::BasicBlock * LoopAfterBlock = llvm::BasicBlock::Create(TheContext, "loopafter", f);
llvm::BasicBlock * EndForBlock = llvm::BasicBlock::Create(TheContext, "endfor", f);
// Put the basic blocks so they can be available to continue && break statements.
lblEntry->u.eLabel.entry = LoopHeadBlock;
lblEntry->u.eLabel.exit = EndForBlock;
lblEntry->u.eLabel.loopAfter = LoopAfterBlock;
if(this->_first != nullptr){
this->_first->codegen();
}
Builder->CreateBr(LoopHeadBlock);
// loophead
llvm::Value* condition; // of type bool aka i8
Builder->SetInsertPoint(LoopHeadBlock);
if(this->_second != nullptr){
condition = this->_second->codegen();
}else{
condition = c8(1); // defaulting to true.
}
auto condBit = Builder->CreateICmpNE(condition, c8(0), "cond");
Builder->CreateCondBr(condBit, LoopBodyBlock, EndForBlock);
//loopbody
Builder->SetInsertPoint(LoopBodyBlock);
this->_body->codegen();
Builder->CreateBr(LoopAfterBlock);
//loopafter
Builder->SetInsertPoint(LoopAfterBlock);
if (this->_third != nullptr){
this->_third->codegen();
}
Builder->CreateBr(LoopHeadBlock);
Builder->SetInsertPoint(EndForBlock);
return nullptr;
}
llvm::Value* ContinueStatement::codegen(){
/*
* Label is always set from the invariant in semantic analysis (ContinueStatement::sem())
* continue label;
*
*/
SymbolEntry * lblEntry ;
if(this->_target == ""){
lblEntry = lookupLabel(NULL, false);
}else{
lblEntry = lookupLabel(this->_target.c_str(), true);
}
Builder->CreateBr(lblEntry->u.eLabel.loopAfter);
SymbolEntry * e = lookupActiveFun();
llvm::Function* f = e->u.eFunction.fun;
// Basic Blocks for Jumping
llvm::BasicBlock *AfterContinue = llvm::BasicBlock::Create(TheContext, "afterContinue", f);
Builder->SetInsertPoint(AfterContinue);
return nullptr;
}
llvm::Value* BreakStatement::codegen(){
/*
* Label is always set from the invariant in semantic analysis (BreakStatement::sem())
* break label;
*
*/
SymbolEntry * lblEntry ;
if(this->_target == ""){
lblEntry = lookupLabel(NULL, false);
}else{
lblEntry = lookupLabel(this->_target.c_str(), true);
}
Builder->CreateBr(lblEntry->u.eLabel.exit);
SymbolEntry * e = lookupActiveFun();
llvm::Function* f = e->u.eFunction.fun;
// Basic Blocks for Jumping
llvm::BasicBlock *AfterBreak = llvm::BasicBlock::Create(TheContext, "afterBreak", f);
Builder->SetInsertPoint(AfterBreak);
return nullptr;
}
llvm::Value* ReturnStatement::codegen(){
// return [e].
if(this->_expr == nullptr){
Builder->CreateRetVoid();
}else{
llvm::Value * retExp = this->_expr->codegen();
Builder->CreateRet(retExp);
}
SymbolEntry * e = lookupActiveFun();
llvm::Function * f = e->u.eFunction.fun;
// Basic Blocks for Going after this is terminated
llvm::BasicBlock * NewEntryBlock = llvm::BasicBlock::Create(TheContext, "newEntry", f);
Builder->SetInsertPoint(NewEntryBlock);
return nullptr;
}
//====================================================================================//
// Code Generation Of Expressions //
//====================================================================================//
llvm::Value* Id::codegen(){
/*
* If not array thus lval do:
* ptr = this->calculateAddressOf();
* val = *ptr
*
* If array just get the ptr
*/
SymbolEntry * e = lookupEntry(this->_name.c_str(), LOOKUP_ALL_SCOPES, false);
llvm::Value* crtPtr = this->calculateAddressOf();
llvm::Value* valOfVar = crtPtr;
if (! (e->u.eVariable.type->kind == Type_tag::TYPE_ARRAY)){
valOfVar = Builder->CreateLoad(crtPtr, this->_name);
}
return valOfVar;
}
llvm::Value* Constant::codegen(){
switch (_ct){
case Bool:
return c8(this->_bool ? 1 : 0);
case Null:
// by semantic analysis this needs to be typecasted to be
// usable so defaulting to a i8p ptr
return llvm::Constant::getNullValue(i8p);
case Int:
return c16(this->_int);
case Char :
return c8(this->_char);
case Double:
return llvm::ConstantFP::get(toLLVMType(this->_t), this->_double);
case String:
// First allocate the string as a global variable
// and return the address of it.
//0. Defs
auto str = this->_string;
auto charType = i8;
//1. Initialize chars vector
std::vector<llvm::Constant *> chars(str.length());
for(unsigned int i = 0; i < str.size(); i++) {
chars[i] = c8(str[i]);
}
//1b. add a zero terminator too
chars.push_back(c8(0));
//2. Initialize the string from the characters
auto stringType = llvm::ArrayType::get(charType, chars.size());
//3. Create the declaration statement
auto v = new llvm::GlobalVariable(
*TheModule,
stringType,
false,
llvm::GlobalValue::PrivateLinkage,
llvm::ConstantArray::get(stringType, chars),
"string.const"
);
//4. Return a cast to an i8*
llvm::Value* ptr = Builder->CreateBitCast(v, i8p, "string.ptr");
return ptr;
}
return nullptr;
}
llvm::Value* FunctionCall::codegen(){
SymbolEntry* e = lookupEntry(this->_functionName.c_str(), LOOKUP_ALL_SCOPES, false);
std::vector<llvm::Value*> evalArgs;
// if the calle is not in global scope we need to provide as argument it's static link
if(e->nestingLevel != GLOBAL_SCOPE){
evalArgs.push_back(getEnvAt(e->nestingLevel));
}
// calculate the arguments in order
SymbolEntry * i = e->u.eFunction.firstArgument;
for(auto &arg : this->_arguments->_expressions){
if(i->u.eParameter.mode == PASS_BY_REFERENCE){
evalArgs.push_back(arg->calculateAddressOf());
}else
evalArgs.push_back(arg->codegen());
i = i->u.eParameter.next;
}
llvm::Function* f = e->u.eFunction.fun;
return Builder->CreateCall(f,evalArgs);
}
llvm::Value* BracketedIndex::codegen(){
llvm::Value* brAdd = this->calculateAddressOf();
return Builder->CreateLoad(brAdd,"indexed");
}
llvm::Value* UnaryOp::codegen(){
switch (this->_UnOp){
case ADDRESS: return this->_operand->calculateAddressOf();
case DEREF: return Builder->CreateLoad(this->_operand->codegen(),"deref");
case POS: return this->_operand->codegen();
case NEG:
if(equalType(this->_t, typeInteger))
return Builder->CreateSub(c16(0),this->_operand->codegen(),"negint");
else
return Builder->CreateFNeg(this->_operand->codegen(),"negfp");
case NOT:
llvm::Value* cond = Builder->CreateICmpEQ(c8(0),this->_operand->codegen(),"cond");
return Builder->CreateZExt(cond,i8,"not");
}
return nullptr;
}
llvm::Value* BinaryOp::codegen(){
llvm::Value* left;
llvm::Value* right;
switch (this->_BinOp){
case MULT:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_t, typeInteger))
return Builder->CreateMul(left,right,"multint");
else
return Builder->CreateFMul(left,right,"multfp");
case DIV:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_t, typeInteger))
return Builder->CreateSDiv(left,right,"divint");
else
return Builder->CreateFDiv(left,right,"divfp");
case MOD:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
return Builder->CreateSRem(left,right,"modint");
case PLUS:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_t, typeInteger))
return Builder->CreateAdd(left,right,"plusint");
else if(equalType(this->_t, typeReal))
return Builder->CreateFAdd(left,right,"plusfp");
else
return Builder->CreateGEP(left,right,"plusptr");
case MINUS:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_t, typeInteger))
return Builder->CreateSub(left,right,"minusint");
if(equalType(this->_t, typeReal))
return Builder->CreateFSub(left,right,"minusfp");
else{
llvm::Value* minus = Builder->CreateSub(c16(0),right,"negoff");
return Builder->CreateGEP(left,minus,"minusptr");
}
case LESS:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_leftOperand->getType(), typeInteger) ||
equalType(this->_leftOperand->getType(), typeChar) ||
equalType(this->_leftOperand->getType(), typeBoolean)){
llvm::Value* cmp = Builder->CreateICmpSLT(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"less");
}
if(equalType(this->_leftOperand->getType(), typeReal)){
llvm::Value* cmp = Builder->CreateFCmpOLT(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"less");
}else{
llvm::Value* ptr1 = Builder->CreatePtrToInt(left,i64,"ltint");
llvm::Value* ptr2 = Builder->CreatePtrToInt(right,i64,"rtint");
llvm::Value* cmp = Builder->CreateICmpSLT(ptr1,ptr2,"cmp");
return Builder->CreateZExt(cmp,i8,"less");
}
case GREATER:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_leftOperand->getType(), typeInteger) ||
equalType(this->_leftOperand->getType(), typeChar) ||
equalType(this->_leftOperand->getType(), typeBoolean)){
llvm::Value* cmp = Builder->CreateICmpSGT(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"gr");
}
if(equalType(this->_leftOperand->getType(), typeReal)){
llvm::Value* cmp = Builder->CreateFCmpOGT(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"gr");
}else{
llvm::Value* ptr1 = Builder->CreatePtrToInt(left,i64,"ltint");
llvm::Value* ptr2 = Builder->CreatePtrToInt(right,i64,"rtint");
llvm::Value* cmp = Builder->CreateICmpSGT(ptr1,ptr2,"cmp");
return Builder->CreateZExt(cmp,i8,"gr");
}
case LESSEQ:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_leftOperand->getType(), typeInteger) ||
equalType(this->_leftOperand->getType(), typeChar) ||
equalType(this->_leftOperand->getType(), typeBoolean)){
llvm::Value* cmp = Builder->CreateICmpSLE(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"leq");
}
if(equalType(this->_leftOperand->getType(), typeReal)){
llvm::Value* cmp = Builder->CreateFCmpOLE(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"leq");
}else{
llvm::Value* ptr1 = Builder->CreatePtrToInt(left,i64,"ltint");
llvm::Value* ptr2 = Builder->CreatePtrToInt(right,i64,"rtint");
llvm::Value* cmp = Builder->CreateICmpSLE(ptr1,ptr2,"cmp");
return Builder->CreateZExt(cmp,i8,"leq");
}
case GREATEREQ:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_leftOperand->getType(), typeInteger) ||
equalType(this->_leftOperand->getType(), typeChar) ||
equalType(this->_leftOperand->getType(), typeBoolean)){
llvm::Value* cmp = Builder->CreateICmpSGE(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"greq");
}
if(equalType(this->_leftOperand->getType(), typeReal)){
llvm::Value* cmp = Builder->CreateFCmpOGE(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"greq");
}else{
llvm::Value* ptr1 = Builder->CreatePtrToInt(left,i64,"ltint");
llvm::Value* ptr2 = Builder->CreatePtrToInt(right,i64,"rtint");
llvm::Value* cmp = Builder->CreateICmpSGE(ptr1,ptr2,"cmp");
return Builder->CreateZExt(cmp,i8,"greq");
}
case EQUALS:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_leftOperand->getType(), typeInteger) ||
equalType(this->_leftOperand->getType(), typeChar) ||
equalType(this->_leftOperand->getType(), typeBoolean)){
llvm::Value* cmp = Builder->CreateICmpEQ(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"eq");
}
if(equalType(this->_leftOperand->getType(), typeReal)){
llvm::Value* cmp = Builder->CreateFCmpOEQ(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"eq");
}else{
llvm::Value* ptr1 = Builder->CreatePtrToInt(left,i64,"ltint");
llvm::Value* ptr2 = Builder->CreatePtrToInt(right,i64,"rtint");
llvm::Value* cmp = Builder->CreateICmpEQ(ptr1,ptr2,"cmp");
return Builder->CreateZExt(cmp,i8,"eq");
}
case NOTEQ:
left = this->_leftOperand->codegen();
right = this->_rightOperand->codegen();
if(equalType(this->_leftOperand->getType(), typeInteger) ||
equalType(this->_leftOperand->getType(), typeChar) ||
equalType(this->_leftOperand->getType(), typeBoolean)){
llvm::Value* cmp = Builder->CreateICmpNE(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"neq");
}
if(equalType(this->_leftOperand->getType(), typeReal)){
llvm::Value* cmp = Builder->CreateFCmpONE(left,right,"cmp");
return Builder->CreateZExt(cmp,i8,"neq");
}else{
llvm::Value* ptr1 = Builder->CreatePtrToInt(left,i64,"ltint");
llvm::Value* ptr2 = Builder->CreatePtrToInt(right,i64,"rtint");
llvm::Value* cmp = Builder->CreateICmpNE(ptr1,ptr2,"cmp");
return Builder->CreateZExt(cmp,i8,"neq");
}
case LAND:{
// Implementing Short Circuit
llvm::Value* cmpl;
SymbolEntry * e = lookupActiveFun();
llvm::Function * f = e->u.eFunction.fun;
llvm::BasicBlock* CurrentBB = Builder->GetInsertBlock();
llvm::BasicBlock* ResultKnown = llvm::BasicBlock::Create(TheContext, "resultKnown", f);
llvm::BasicBlock* NeedEvaluateSecond = llvm::BasicBlock::Create(TheContext, "needEvaluateSecond", f);
// Evaluate the left hand side. If it is 0 then the result is known
// to be zero
left = this->_leftOperand->codegen();
cmpl = Builder->CreateICmpEQ(left,c8(0),"cmp");
Builder->CreateCondBr(cmpl, ResultKnown, NeedEvaluateSecond);
CurrentBB = Builder->GetInsertBlock();
// Evaluate the right hand side since the left hand side wasn't enough to know the result
Builder->SetInsertPoint(NeedEvaluateSecond);
right = this->_rightOperand->codegen();
Builder->CreateBr(ResultKnown);
NeedEvaluateSecond = Builder->GetInsertBlock();
// Adjust the result based on the path
Builder->SetInsertPoint(ResultKnown);
llvm::PHINode* phi = Builder->CreatePHI(toLLVMType(this->getType()), 2, "val");
// If from currentBB => the result was known to be 0.
phi->addIncoming(c8(0), CurrentBB);
// if from NeedEvaluateSecond the result is right since
// true && x = x;
phi->addIncoming(right, NeedEvaluateSecond);
return phi;
}
case LOR:{
// Implementing Short Circuit
llvm::Value* cmpl;
SymbolEntry * e = lookupActiveFun();
llvm::Function * f = e->u.eFunction.fun;
llvm::BasicBlock* CurrentBB = Builder->GetInsertBlock();
llvm::BasicBlock* ResultKnown = llvm::BasicBlock::Create(TheContext, "resultKnown", f);
llvm::BasicBlock* NeedEvaluateSecond = llvm::BasicBlock::Create(TheContext, "needEvaluateSecond", f);
// Evaluate the left hand side. If it is true then the result is known
// to be true
left = this->_leftOperand->codegen();
cmpl = Builder->CreateICmpNE(left,c8(0),"cmp");
Builder->CreateCondBr(cmpl, ResultKnown, NeedEvaluateSecond);
CurrentBB = Builder->GetInsertBlock();
// Evaluate the right hand side since the left hand side wasn't enough to know the result
Builder->SetInsertPoint(NeedEvaluateSecond);
right = this->_rightOperand->codegen();
Builder->CreateBr(ResultKnown);
NeedEvaluateSecond = Builder->GetInsertBlock();
// Adjust the result based on the path
Builder->SetInsertPoint(ResultKnown);
llvm::PHINode* phi = Builder->CreatePHI(toLLVMType(this->getType()), 2, "val");
// If from currentBB => the result was known to be 1.
phi->addIncoming(c8(1), CurrentBB);
// if from NeedEvaluateSecond the result is right since
// false || x = x;
phi->addIncoming(right, NeedEvaluateSecond);
return phi;
}
case COMMA: return nullptr;
}
return nullptr;
}
llvm::Value* PrefixUnAss::codegen(){
llvm::Value* addr = this->_operand->calculateAddressOf();
llvm::Value* val = Builder->CreateLoad(addr,"val");
llvm::Value* nval;
if(this->_Unass == PLUSPLUS){
if(equalType(this->_t, typeInteger)){
nval = Builder->CreateAdd(val,c16(1),"nval");
}
else if(equalType(this->_t, typeReal)){
nval = Builder->CreateFAdd(val,llvm::ConstantFP::get(toLLVMType(typeReal), 1.0L),"nval");
}else{
nval = Builder->CreateGEP(val,c64(1),"nval");
}
}else{
if(equalType(this->_t, typeInteger)){
nval = Builder->CreateSub(val,c16(1),"nval");
}
else if(equalType(this->_t, typeReal)){
nval = Builder->CreateFSub(val,llvm::ConstantFP::get(toLLVMType(typeReal),1.0L),"nval");
}else{
nval = Builder->CreateGEP(val,c16(-1),"minusptr");
}
}
Builder->CreateStore(nval,addr);
return nval;
}
llvm::Value* PostfixUnAss::codegen(){
llvm::Value* addr = this->_operand->calculateAddressOf();
llvm::Value* val = Builder->CreateLoad(addr,"val");
llvm::Value* nval;
if(this->_Unass == PLUSPLUS){
if(equalType(this->_t, typeInteger)){
nval = Builder->CreateAdd(val,c16(1),"nval");
}
else if(equalType(this->_operand->getType(), typeReal)){
nval = Builder->CreateFAdd(val,llvm::ConstantFP::get(toLLVMType(typeReal), 1.0L),"nval");
}else{
nval = Builder->CreateGEP(val,c64(1),"nval");
}
}else{
if(equalType(this->_t, typeInteger)){
nval = Builder->CreateSub(val,c16(1),"nval");
}
else if(equalType(this->_t, typeReal)){
nval = Builder->CreateFSub(val,llvm::ConstantFP::get(toLLVMType(typeReal),1.0L),"nval");
}else{
nval = Builder->CreateGEP(val,c16(-1),"minusptr");
}
}
Builder->CreateStore(nval,addr);
return val;
}
llvm::Value* BinaryAss::codegen(){
llvm::Value* addr = this->_leftOperand->calculateAddressOf();
llvm::Value* right = this->_rightOperand->codegen();
llvm::Value* left = Builder->CreateLoad(addr,"left");
llvm::Value* nval = nullptr;
switch (this->_BinAss){
case ASS:
nval = right;
break;
case MULTASS:
if(equalType(this->_t, typeInteger))
nval = Builder->CreateMul(left,right,"multint");
else
nval = Builder->CreateFMul(left,right,"multfp");
break;
case DIVASS:
if(equalType(this->_t, typeInteger))
nval = Builder->CreateSDiv(left,right,"divint");
else
nval = Builder->CreateFDiv(left,right,"divfp");
break;
case MODASS:
nval = Builder->CreateSRem(left,right,"modint");
break;
case PLUSASS:
if(equalType(this->_t, typeInteger))
nval = Builder->CreateAdd(left,right,"plusint");
else if(equalType(this->_t, typeReal))
nval = Builder->CreateFAdd(left,right,"plusfp");
else
nval = Builder->CreateGEP(left,right,"plusptr");
break;
case MINUSASS:
if(equalType(this->_t, typeInteger))
nval = Builder->CreateSub(left,right,"minusint");
else if(equalType(this->_t, typeReal))
nval = Builder->CreateFSub(left,right,"minusfp");
else{
llvm::Value* minus = Builder->CreateSub(c16(0),right,"negoff");
nval = Builder->CreateGEP(left,minus,"minusptr");
}
}
Builder->CreateStore(nval,addr);
return nval;
}
/**
* @brief See Semantics.md for typecast definitions
*
*/
llvm::Value* TypeCast::codegen(){
llvm::Value* inner = this->_expr->codegen();
auto tt = this->_type->toType();
size_t index = tt->kind * 9 + this->_expr->getType()->kind;
llvm::Value* casted = inner;
llvm::Value* castedInter;
#define getCast(to, from) Type_tag::to * 9 + Type_tag::from
switch (index)
{
// TO INTEGER TYPECASTS
case getCast(TYPE_INTEGER, TYPE_BOOLEAN):
casted = Builder->CreateZExt(inner, i16, "casted");
break;
case getCast(TYPE_INTEGER, TYPE_CHAR):
casted = Builder->CreateSExt(inner, i16, "casted");
break;
case getCast(TYPE_INTEGER, TYPE_REAL):
casted = Builder->CreateFPToSI(inner, i16, "casted");
break;
case getCast(TYPE_INTEGER, TYPE_POINTER):
case getCast(TYPE_INTEGER, TYPE_ARRAY):
casted = Builder->CreatePtrToInt(inner, i16, "casted");
break;
// TO BOOL TYPECASTS
case getCast(TYPE_BOOLEAN, TYPE_INTEGER):
casted = Builder->CreateTrunc(inner, i8, "casted");
break;
case getCast(TYPE_BOOLEAN, TYPE_REAL):
casted = Builder->CreateFPToUI(inner, i8, "casted");
break;
case getCast(TYPE_BOOLEAN, TYPE_POINTER):
case getCast(TYPE_BOOLEAN, TYPE_ARRAY):
casted = Builder->CreatePtrToInt(inner, i8, "casted");
break;
// TO CHAR TYPECASTS
case getCast(TYPE_CHAR, TYPE_INTEGER):
casted = Builder->CreateTrunc(inner, i8, "casted");
break;
case getCast(TYPE_CHAR, TYPE_REAL):
casted = Builder->CreateFPToSI(inner, i8, "casted");
break;
case getCast(TYPE_CHAR, TYPE_POINTER):
case getCast(TYPE_CHAR, TYPE_ARRAY):