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ast.cpp
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ast.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <fstream>
#include "ast.hpp"
using namespace llvm;
std::ofstream myfile;
// Global LLVM variables related to the LLVM suite.
static LLVMContext TheContext;
static IRBuilder<> Builder(TheContext);
static std::unique_ptr<Module> TheModule;
static std::unique_ptr<legacy::FunctionPassManager> TheFPM;
static Function *TheWriteInteger;
static Function *TheWriteByte;
static Function *TheWriteChar;
static Function *TheWriteString;
static Function *TheReadInteger;
static Function *TheReadByte;
static Function *TheReadChar;
static Function *TheReadString;
static Function *TheStrlen;
static Function *TheStrcmp;
static Function *TheStrcpy;
static Function *TheStrcat;
// Useful LLVM types.
static Type *proc = Type::getVoidTy(TheContext);
static Type *i8 = IntegerType::get(TheContext, 8);
static Type *i16 = IntegerType::get(TheContext, 16);
// Useful LLVM helper functions.
inline ConstantInt *c1(char c)
{
return ConstantInt::get(TheContext, APInt(1, c, true));
}
inline ConstantInt *c8(char c)
{
return ConstantInt::get(TheContext, APInt(8, c, true));
}
inline ConstantInt *c16(int n)
{
return ConstantInt::get(TheContext, APInt(16, n, true));
}
inline ConstantInt *c32(int n)
{
return ConstantInt::get(TheContext, APInt(32, n, true));
}
Scopes context;
void llvm_compile_and_dump(FunctionAST *t)
{
myfile.open("ast.txt");
// Initialize the module and the optimization passes.
TheModule = make_unique<Module>("alan program", TheContext);
if (o_flag)
{
TheFPM = make_unique<legacy::FunctionPassManager>(TheModule.get());
TheFPM->add(createPromoteMemoryToRegisterPass());
TheFPM->add(createGVNPass());
TheFPM->add(createCFGSimplificationPass());
TheFPM->add(createDeadCodeEliminationPass());
TheFPM->add(createDeadInstEliminationPass());
for (int i = 0; i < 5; ++i)
TheFPM->add(createDeadStoreEliminationPass());
TheFPM->add(createInstructionCombiningPass());
TheFPM->add(createReassociatePass());
TheFPM->add(createGVNPass());
TheFPM->add(createCFGSimplificationPass());
TheFPM->doInitialization();
}
/* ---------------------------------------------------------------------------*/
/* declare functions of runtime library */
/* ---------------------------------------------------------------------------*/
/*---------------------------- WRITE functions ----------------------------*/
// writeInteger (n : int) : proc
FunctionType *writeInteger_type =
FunctionType::get(Type::getVoidTy(TheContext),
std::vector<Type *>{i16}, false);
TheWriteInteger =
Function::Create(writeInteger_type, Function::ExternalLinkage,
"writeInteger", TheModule.get());
// writeByte (b : byte) : proc
FunctionType *writeByte_type =
FunctionType::get(Type::getVoidTy(TheContext),
std::vector<Type *>{i8}, false);
TheWriteByte =
Function::Create(writeByte_type, Function::ExternalLinkage,
"writeByte", TheModule.get());
Function::arg_iterator arg = TheWriteByte->arg_begin();
Value *byte = &(*arg);
BasicBlock *b = BasicBlock::Create(TheContext, "", TheWriteByte, 0);
Builder.SetInsertPoint(b);
Value *retint = Builder.CreateSExt(byte, i16);
Builder.CreateCall(TheWriteInteger, {retint});
Builder.CreateRet(nullptr);
// writeChar (b : byte) : proc
FunctionType *writeChar_type =
FunctionType::get(Type::getVoidTy(TheContext),
std::vector<Type *>{i8}, false);
TheWriteChar =
Function::Create(writeChar_type, Function::ExternalLinkage,
"writeChar", TheModule.get());
// writeString (s : reference byte []) : proc
FunctionType *writeString_type =
FunctionType::get(Type::getVoidTy(TheContext),
std::vector<Type *>{PointerType::get(i8, 0)}, false);
TheWriteString =
Function::Create(writeString_type, Function::ExternalLinkage,
"writeString", TheModule.get());
/*---------------------------- READ functions ----------------------------*/
// readInteger () : int
FunctionType *readInteger_type =
FunctionType::get(Type::getInt16Ty(TheContext),
std::vector<Type *>(), false);
TheReadInteger =
Function::Create(readInteger_type, Function::ExternalLinkage,
"readInteger", TheModule.get());
// readByte () : byte
FunctionType *readByte_type =
FunctionType::get(Type::getInt8Ty(TheContext),
std::vector<Type *>(), false);
TheReadByte =
Function::Create(readByte_type, Function::ExternalLinkage,
"readByte", TheModule.get());
// readChar () : byte
FunctionType *readChar_type =
FunctionType::get(Type::getInt8Ty(TheContext),
std::vector<Type *>(), false);
TheReadChar =
Function::Create(readChar_type, Function::ExternalLinkage,
"readChar", TheModule.get());
// readString (n : int, s : reference byte []) : proc
FunctionType *readString_type =
FunctionType::get(Type::getVoidTy(TheContext),
std::vector<Type *>{i16, PointerType::getUnqual(i8)}, false);
TheReadString =
Function::Create(readString_type, Function::ExternalLinkage,
"readString", TheModule.get());
/*---------------------------- CONVERSION functions ----------------------------*/
// extend (b : byte) : int
FunctionType *extend_type =
FunctionType::get(Type::getInt16Ty(TheContext), std::vector<Type *>{i8}, false);
Function *TheExtend =
Function::Create(extend_type, Function::ExternalLinkage, "extend", TheModule.get());
arg = TheExtend->arg_begin();
Value *int8_c = &(*arg);
BasicBlock *bl = BasicBlock::Create(TheContext, "", TheExtend, 0);
Builder.SetInsertPoint(bl);
Value *ret = Builder.CreateSExt(int8_c, i16);
Builder.CreateRet(ret);
// shrink (i : int) : byte
FunctionType *shrink_type =
FunctionType::get(i8, std::vector<Type *>{i16}, false);
Function *TheShrink =
Function::Create(shrink_type, Function::ExternalLinkage, "shrink", TheModule.get());
arg = TheShrink->arg_begin();
Value *int16_c = &(*arg);
BasicBlock *bl2 = BasicBlock::Create(TheContext, "", TheShrink, 0);
Builder.SetInsertPoint(bl2);
ret = Builder.CreateTrunc(int16_c, i8);
Builder.CreateRet(ret);
/*---------------------------- STRING functions ----------------------------*/
// strlen (s : reference byte []) : int
FunctionType *strlen_type =
FunctionType::get(Type::getInt16Ty(TheContext),
std::vector<Type *>{PointerType::getUnqual(i8)}, false);
TheStrlen =
Function::Create(strlen_type, Function::ExternalLinkage,
"strlen", TheModule.get());
// strcmp (s1 : reference byte [], s2 : reference byte []) : int
FunctionType *strcmp_type =
FunctionType::get(Type::getInt16Ty(TheContext),
std::vector<Type *>{PointerType::getUnqual(i8), PointerType::getUnqual(i8)}, false);
TheStrcmp =
Function::Create(strcmp_type, Function::ExternalLinkage,
"strcmp", TheModule.get());
// strcpy (trg : reference byte [], src : reference byte []) : proc
FunctionType *strcpy_type =
FunctionType::get(Type::getVoidTy(TheContext),
std::vector<Type *>{PointerType::getUnqual(i8), PointerType::getUnqual(i8)}, false);
TheStrcpy =
Function::Create(strcpy_type, Function::ExternalLinkage,
"strcpy", TheModule.get());
// strcat (trg : reference byte [], src : reference byte []) : proc
FunctionType *strcat_type =
FunctionType::get(Type::getVoidTy(TheContext),
std::vector<Type *>{PointerType::getUnqual(i8), PointerType::getUnqual(i8)}, false);
TheStrcat =
Function::Create(strcat_type, Function::ExternalLinkage,
"strcat", TheModule.get());
// Define and start the main function.
Function *main_function = t->codegen();
if (t->Proto->getName() != "main")
{
auto fun = TheModule->getFunction("main");
main_function = TheModule->getFunction(t->Proto->getName());
if (fun != NULL)
fun->setName("_oldmain");
main_function->setName("main");
}
// Verify and optimize the main function.
bool bad = verifyModule(*TheModule, &errs());
if (bad)
{
fprintf(stderr, "The faulty IR is:\n");
fprintf(stderr, "------------------------------------------------\n\n");
TheModule->print(outs(), nullptr);
return;
}
if (o_flag)
TheFPM->run(*main_function);
// Print out the IR.
TheModule->print(outs(), nullptr);
}
Value *LogError(std::string Str)
{
fprintf(stderr, "\nError: %s\n\n", Str.c_str());
return nullptr;
}
Value *loadValue(Value *p)
{
if (PointerType::classof(p->getType()))
return Builder.CreateLoad(p, "var");
else
return p;
}
/// CreateEntryBlockAlloca - Create an alloca instruction in the entry block of the function.
static AllocaInst *CreateEntryBlockAlloca(Function *TheFunction, const std::string &VarName, Type *t)
{
IRBuilder<> TmpB(&TheFunction->getEntryBlock(),
TheFunction->getEntryBlock().begin());
return TmpB.CreateAlloca(t, 0, VarName.c_str());
}
Type *getDataType(int n)
{
switch (n)
{
case 0:
return proc;
case 8:
return i8;
case 16:
return i16;
default:
return proc;
}
}
/* ------------------------------------------- IR for ExprAST ------------------------------------------- */
// IR for <int-const>
Value *IntConst_ExprAST::codegen()
{
return c16(Val);
}
Type *IntConst_ExprAST::getT()
{
return i16;
}
// IR for <char-const>
Value *CharConst_ExprAST::codegen()
{
return c8(Val);
}
Type *CharConst_ExprAST::getT()
{
return i8;
}
// IR for <id>
Value *Id_ExprAST::codegen()
{
// Look this variable up in the function.
AllocaInst *V = cast<AllocaInst>((*(context.symbol_table()[Name])).ptr);
if (!V)
{
LogError("Unknown variable name: " + Name);
exit(1);
}
if (PointerType::classof(V->getAllocatedType()) && ArrayType::classof(V->getAllocatedType()->getPointerElementType()))
{
// id of array (in nested function) with pointer of ArrayType
std::vector<Value *> indexList;
indexList.push_back(c16(0));
indexList.push_back(c16(0));
LoadInst *ldinst = Builder.CreateLoad(V, Name);
GetElementPtrInst *gepInst = GetElementPtrInst::CreateInBounds((V->getAllocatedType()->getPointerElementType()), ldinst, ArrayRef<Value *>(indexList), Name, Builder.GetInsertBlock());
return gepInst;
}
else if (PointerType::classof(V->getAllocatedType()))
{
// id (in nested function) with pointer of IntegerType
std::vector<Value *> indexList;
indexList.push_back(c16(0));
LoadInst *ldinst = Builder.CreateLoad(V, Name);
GetElementPtrInst *gepInst = GetElementPtrInst::CreateInBounds((V->getAllocatedType())->getPointerElementType(), ldinst, ArrayRef<Value *>(indexList), Name, Builder.GetInsertBlock());
return gepInst;
}
else if (ArrayType::classof(V->getAllocatedType()))
{
// id of array of ArrayType
std::vector<Value *> indexList;
indexList.push_back(c8(0));
indexList.push_back(c8(0));
GetElementPtrInst *gepInst = GetElementPtrInst::CreateInBounds(V->getAllocatedType(), V, ArrayRef<Value *>(indexList), Name, Builder.GetInsertBlock());
return gepInst;
}
else
{
// id of IntegerType
return V;
}
return V;
}
Type *Id_ExprAST::getT()
{
Value *V = (*(context.symbol_table()[Name])).ptr;
if (!V)
{
LogError("Unknown variable name: " + Name);
exit(1);
}
Type *idT = ((*(context.symbol_table()[Name])).ptr)->getType()->getPointerElementType();
if (PointerType::classof(idT))
{
if (ArrayType::classof(idT->getPointerElementType()))
return idT->getPointerElementType();
else
return idT->getPointerElementType();
}
else if (ArrayType::classof(idT))
return idT;
else
return idT;
}
// IR for <id>[<expr>]
Value *ArrayElement_ExprAST::codegen()
{
AllocaInst *arr = cast<AllocaInst>((*(context.symbol_table()[Name])).ptr);
if (!arr)
{
LogError("WTF Unknown array name: " + Name);
exit(1);
}
Value *index = expr->codegen();
index = loadValue(index);
if (PointerType::classof(arr->getAllocatedType()))
{
if (ArrayType::classof(arr->getAllocatedType()->getPointerElementType()))
{
// array element (in nested function) with pointer of ArrayType
std::vector<Value *> indexList;
indexList.push_back(c32(0));
indexList.push_back(index);
LoadInst *ldinst = Builder.CreateLoad(arr, Name);
GetElementPtrInst *gepInst = GetElementPtrInst::CreateInBounds((arr->getAllocatedType())->getPointerElementType(), ldinst, ArrayRef<Value *>(indexList), Name, Builder.GetInsertBlock());
return gepInst;
}
else
{
// array element (in nested function) with pointer of IntegerType
std::vector<Value *> indexList;
indexList.push_back(index);
LoadInst *ldinst = Builder.CreateLoad(arr, Name);
GetElementPtrInst *gepInst = GetElementPtrInst::CreateInBounds((arr->getAllocatedType())->getPointerElementType(), ldinst, ArrayRef<Value *>(indexList), Name, Builder.GetInsertBlock());
return gepInst;
}
}
else
{
// array element of ArrayType
std::vector<Value *> indexList;
indexList.push_back(c32(0));
indexList.push_back(index);
GetElementPtrInst *gepInst = GetElementPtrInst::CreateInBounds(arr->getAllocatedType(), arr, ArrayRef<Value *>(indexList), Name, Builder.GetInsertBlock());
return gepInst;
}
}
Type *ArrayElement_ExprAST::getT()
{
TypeCheck();
Type *idT = ((*(context.symbol_table()[Name])).ptr)->getType()->getPointerElementType();
if (PointerType::classof(idT))
{
if (ArrayType::classof(idT->getPointerElementType()))
return idT->getPointerElementType()->getArrayElementType();
else
return idT->getPointerElementType();
}
else if (ArrayType::classof(idT))
return idT->getArrayElementType();
else
return idT;
}
void ArrayElement_ExprAST::TypeCheck()
{
int isarray = (*(context.symbol_table()[Name])).isarray;
if (isarray != 1)
{
LogError("Unknown array name: " + Name);
exit(1);
}
Type *indexT = expr->getT();
if (!(indexT->isIntegerTy(16)))
{
LogError("Index of array " + Name + "[] must be of int type");
exit(1);
}
return;
}
// IR for string-literal
Value *StringLiteral_ExprAST::codegen()
{
std::vector<llvm::Constant *> values;
size_t i;
for (i = 1; i < string_literal.length() - 1; i++)
{
values.push_back(c8(string_literal[i]));
}
values.push_back(c8('\0'));
ArrayType *string_type = ArrayType::get(i8, string_literal.length() - 1);
GlobalVariable *TheString = new GlobalVariable(
*TheModule, string_type, false, GlobalValue::InternalLinkage,
ConstantArray::get(string_type,
values),
"string_literal");
Value *idxList[] = {c32(0), c32(0)};
return GetElementPtrInst::CreateInBounds(string_type, TheString, ArrayRef<Value *>(idxList), "str_ptr", Builder.GetInsertBlock());
}
Type *StringLiteral_ExprAST::getT()
{
return PointerType::getUnqual(i8);
}
// IR for ⟨expr⟩ ( '+' | '-' | '*' | '/' | '%' ) ⟨expr⟩
Value *ArithmeticOp_ExprAST::codegen()
{
TypeCheck();
Value *L = LHS->codegen();
Value *R = RHS->codegen();
if (!L || !R)
return nullptr;
Value *temp1 = loadValue(L);
Value *temp2 = loadValue(R);
L = temp1;
R = temp2;
switch (Op)
{
case PLUS:
return Builder.CreateAdd(L, R, "addtmp");
case MINUS:
return Builder.CreateSub(L, R, "subtmp");
case TIMES:
return Builder.CreateMul(L, R, "multmp");
case DIV:
return Builder.CreateUDiv(L, R, "modtmp");
case MOD:
return Builder.CreateURem(L, R, "modtmp");
default:
return LogError("invalid binary operator");
}
}
Type *ArithmeticOp_ExprAST::getT()
{
Type *LT = LHS->getT();
Type *RT = RHS->getT();
if (!Unary)
{
if (LT != RT)
{
LogError("\noperands of arithmetic operation must be of same type\n");
exit(1);
}
}
return RT;
}
void ArithmeticOp_ExprAST::TypeCheck()
{
Type *LT = LHS->getT();
Type *RT = RHS->getT();
if (!Unary)
if (LT != RT)
{
LogError("\noperands of arithmetic operation must be of same type\n");
exit(1);
}
return;
}
/* ------------------------------------------- IR for CondAST ------------------------------------------- */
// IR for ⟨expr⟩( '==' | '!=' | '<' | '>' | '<=' | '>=' )⟨expr⟩
Value *ComparisonOp_CondAST::codegen()
{
TypeCheck();
Value *l = LHS->codegen();
Value *r = RHS->codegen();
if (!l || !r)
return nullptr;
l = loadValue(l);
r = loadValue(r);
switch (Op)
{
case L:
return Builder.CreateICmpSLT(l, r, "ltmp");
case G:
return Builder.CreateICmpSGT(l, r, "gtmp");
case LE:
return Builder.CreateICmpSLE(l, r, "letmp");
case GE:
return Builder.CreateICmpSGE(l, r, "getmp");
case EQ:
return Builder.CreateICmpEQ(l, r, "eqtmp");
case NE:
return Builder.CreateICmpNE(l, r, "netmp");
default:
return LogError("invalid binary operator");
}
}
void ComparisonOp_CondAST::TypeCheck()
{
Type *LT = LHS->getT();
Type *RT = RHS->getT();
if (LT != RT)
{
LogError("\noperands of comparison operation must be of same type\n");
exit(1);
}
return;
}
// IR for ⟨cond⟩ ( '&' | '|' ) ⟨cond⟩
Value *LogicalOp_CondAST::codegen()
{
Value *l = LHS->codegen();
Value *r = RHS->codegen();
if (!l)
return nullptr;
l = loadValue(l);
r = loadValue(r);
switch (Op)
{
case AND:
if (!r)
return nullptr;
return Builder.CreateAnd(l, r, "andtmp");
case OR:
if (!r)
return nullptr;
return Builder.CreateOr(l, r, "ortmp");
case NOT:
return Builder.CreateNot(l, "nottmp");
default:
return LogError("invalid binary operator");
}
}
void LogicalOp_CondAST::TypeCheck()
{
Type *LT = LHS->getT();
Type *RT = RHS->getT();
if (LT != RT)
{
LogError("\noperands of logical operation must be of same type\n");
exit(1);
}
return;
}
/* ------------------------------------------- IR for StmtAST ------------------------------------------- */
// IR for ⟨l-value⟩ '=' ⟨expr⟩
Value *Assignment_StmtAST::codegen()
{
TypeCheck();
// l-value is always a pointer
Value *V = LHS->codegen();
// evaluate r-value
Value *Val = RHS->codegen();
if (!Val)
return nullptr;
// if r-value is pointer, load its value
Val = loadValue(Val);
return Builder.CreateStore(Val, V);
}
void Assignment_StmtAST::TypeCheck()
{
Type *LT = LHS->getT();
Type *RT = RHS->getT();
if (LT->isFunctionTy() || LT->isFunctionTy())
{
LogError("operands of assignement operation cannot be functions");
exit(1);
}
if (LT != RT)
{
LogError("operands of assignement operation must be of same type");
exit(1);
}
return;
}
// IR for ⟨compound-stmt⟩
Value *CompoundStmt_StmtAST::codegen()
{
StatementList::const_iterator it;
Value *last = NULL;
for (it = statements.begin(); it != statements.end(); it++)
{
last = (**it).codegen();
}
return last;
}
// IR for ⟨func-call⟩
Value *FuncCall::codegen()
{
TypeCheck();
// Look up the name in the global module table.
Function *CalleeF = dyn_cast<Function>((*(context.symbol_table()[Callee])).ptr);
std::vector<Value *> ArgsV;
FunctionType *FTy = CalleeF->getFunctionType();
for (unsigned i = 0, e = Args.size(); i != e; ++i)
{
// check if argument pass by reference
if (PointerType::classof(FTy->getParamType(i)))
ArgsV.push_back(Args[i]->codegen());
else
ArgsV.push_back(loadValue(Args[i]->codegen()));
if (!ArgsV.back())
return nullptr;
}
for (std::map<std::string, std::pair<Type *, AllocaInst *>>::iterator it = (context.inherited()[Callee]).begin(); it != (context.inherited()[Callee]).end(); ++it)
//Passing pointers to hidden arguments
{
if (PointerType::classof(((*(context.symbol_table()[it->first])).ptr)->getType()) && PointerType::classof(((*(context.symbol_table()[it->first])).ptr)->getType()->getPointerElementType()))
{
LoadInst *ldinst = Builder.CreateLoad((*(context.symbol_table()[it->first])).ptr, it->first);
ArgsV.push_back(ldinst);
}
else if (PointerType::classof(((*(context.symbol_table()[it->first])).ptr)->getType()))
{
std::vector<Value *> indexList;
indexList.push_back(c16(0));
GetElementPtrInst *gepInst = GetElementPtrInst::CreateInBounds(((*(context.symbol_table()[it->first])).ptr)->getType()->getPointerElementType(), (*(context.symbol_table()[it->first])).ptr, ArrayRef<Value *>(indexList), it->first, Builder.GetInsertBlock());
ArgsV.push_back(gepInst);
}
else
{
std::vector<Value *> indexList;
indexList.push_back(c16(0));
GetElementPtrInst *gepInst = GetElementPtrInst::CreateInBounds(((*(context.symbol_table()[it->first])).ptr)->getType(), (*(context.symbol_table()[it->first])).ptr, ArrayRef<Value *>(indexList), it->first, Builder.GetInsertBlock());
ArgsV.push_back(gepInst);
}
}
return Builder.CreateCall(CalleeF, ArgsV);
}
Type *FuncCall::getT()
{
Function *CalleeF = TheModule->getFunction((*(context.symbol_table()[Callee])).new_name);
return CalleeF->getFunctionType()->getReturnType();
}
void FuncCall::TypeCheck()
{
// Look up the name in the global module table.
if (!(context.symbol_table()[Callee]))
{
LogError("Unknown function referenced: " + Callee);
exit(1);
}
Function *CalleeF = dyn_cast<Function>((*(context.symbol_table()[Callee])).ptr);
if (!CalleeF)
{
LogError("Unknown function referenced: " + Callee);
exit(1);
}
// Check argument mismatch error: Except the real parameters, we take into consideration the #pointers of previous variables' declaration
if (CalleeF->arg_size() != (Args.size() + (context.getTop()->getInherited()[Callee]).size()))
{
LogError("Incorrect # arguments passed in function: " + Callee);
exit(1);
}
FunctionType *FTy = CalleeF->getFunctionType();
std::vector<int> fp = ((*(context.symbol_table()[Callee])).function_parameters);
for (std::size_t k = 0; k < fp.size(); ++k)
{
// variable
if (fp[k] == 0)
{
// pass variable by reference
if (PointerType::classof(FTy->getParamType(k)))
if (!dynamic_cast<Id_ExprAST *>(Args[k]) && !dynamic_cast<ArrayElement_ExprAST *>(Args[k]))
{
LogError("Calling function with wrong argument type, arg no: " + std::to_string(k + 1) + " :expected identifier");
exit(1);
}
Type *tempType = Args[k]->getT();
if (PointerType::classof(tempType))
tempType = tempType->getPointerElementType();
Type *paramType = FTy->getParamType(k);
if (PointerType::classof(paramType))
paramType = paramType->getPointerElementType();
if (tempType != paramType)
{
LogError("Calling function with wrong argument type, arg no: " + std::to_string(k + 1));
exit(1);
}
}
// array
else
{
Id_ExprAST *temp = dynamic_cast<Id_ExprAST *>(Args[k]);
if (!temp)
{
StringLiteral_ExprAST *temp_sl = dynamic_cast<StringLiteral_ExprAST *>(Args[k]);
if (!temp_sl)
{
LogError("Calling function with wrong argument type, arg no: " + std::to_string(k + 1) + " :array expected");
exit(1);
}
}
else
{
if ((*context.symbol_table()[temp->getName()]).isarray != 1)
{
LogError("Calling function with wrong argument type, arg no: " + std::to_string(k + 1) + " :array expected");
exit(1);
}
// Check Array Type Mismatch
else if ((*context.symbol_table()[temp->getName()]).isarray == 1)
{
Type *tempType = temp->getT();
if (PointerType::classof(temp->getT()))
tempType = tempType->getPointerElementType();
else if (ArrayType::classof(temp->getT()))
tempType = tempType->getArrayElementType();
if (tempType != FTy->getParamType(k)->getPointerElementType())
{
LogError("Calling function with wrong argument type, arg no: " + std::to_string(k + 1) + " :arrays not of same type");
exit(1);
}
}
}
}
}
return;
}
// IR for “if” '(' ⟨cond⟩ ')' ⟨stmt⟩ [ “else” ⟨stmt⟩ ]
Value *If_StmtAST::codegen()
{
Value *CondV = Cond->codegen();
if (!CondV)
return nullptr;
CondV = Builder.CreateICmpNE(CondV, c1(0), "ifcond");
Function *TheFunction = Builder.GetInsertBlock()->getParent();
BasicBlock *ThenBB = BasicBlock::Create(TheContext, "then", TheFunction);
BasicBlock *ElseBB = BasicBlock::Create(TheContext, "else");
BasicBlock *MergeBB = BasicBlock::Create(TheContext, "ifcont");
Builder.CreateCondBr(CondV, ThenBB, ElseBB);
Builder.SetInsertPoint(ThenBB);
Value *ThenV = Then->codegen();
if (!ThenV)
return nullptr;
if (!Builder.GetInsertBlock()->getTerminator())
Builder.CreateBr(MergeBB);
TheFunction->getBasicBlockList().push_back(ElseBB);
Builder.SetInsertPoint(ElseBB);
Value *ElseV = nullptr;
if (Else != nullptr)
{
ElseV = Else->codegen();
if (!ElseV)
return nullptr;
}
if (!Builder.GetInsertBlock()->getTerminator())
Builder.CreateBr(MergeBB);
TheFunction->getBasicBlockList().push_back(MergeBB);
Builder.SetInsertPoint(MergeBB);
return c32(0);
}
// IR for “while” '(' ⟨cond⟩ ')' ⟨stmt⟩
Value *While_StmtAST::codegen()
{
Value *CondV = Cond->codegen();
if (!CondV)
return nullptr;
CondV = Builder.CreateICmpNE(CondV, c1(0), "while_entry");
Function *TheFunction = Builder.GetInsertBlock()->getParent();
BasicBlock *WhileBB = BasicBlock::Create(TheContext, "while", TheFunction);
BasicBlock *MergeBB = BasicBlock::Create(TheContext, "while_end");
Builder.CreateCondBr(CondV, WhileBB, MergeBB);
Builder.SetInsertPoint(WhileBB);
Value *StmtV = Stmt->codegen();
if (!StmtV)
return nullptr;
Value *WhileV = Cond->codegen();
if (!WhileV)
return nullptr;
WhileV = Builder.CreateICmpNE(WhileV, c1(0), "while_entry");
if (!Builder.GetInsertBlock()->getTerminator())
Builder.CreateCondBr(WhileV, WhileBB, MergeBB);
TheFunction->getBasicBlockList().push_back(MergeBB);
Builder.SetInsertPoint(MergeBB);
return c32(0);
}
// IR for “return” [ ⟨expr⟩ ]
Value *Return_Stmt::codegen()
{
TypeCheck();
if (expr == nullptr)
{
context.setCurrentReturnValue(nullptr);
if (!Builder.GetInsertBlock()->getTerminator())
ReturnInst::Create(TheContext, context.getCurrentReturnValue(), Builder.GetInsertBlock());
return c32(0);
}
Value *returnValue = expr->codegen();
returnValue = loadValue(returnValue);
context.setCurrentReturnValue(returnValue);
if (!Builder.GetInsertBlock()->getTerminator())
ReturnInst::Create(TheContext, context.getCurrentReturnValue(), Builder.GetInsertBlock());
return returnValue;
}
void Return_Stmt::TypeCheck()
{
Type *ret = context.getTop()->getFunction()->getFunctionType()->getReturnType();
if (!expr)
{
if (!(ret->isVoidTy()))
{
LogError("Return type of function doesn't match definition type which is void");
exit(1);
}
}
else if (ret != expr->getT())
{
LogError("Return type of function " + std::string((context.getTop()->getFunction()->getName())) + " doesn't match definition type ");
exit(1);
}
return;
}
/* ------------------------------------------- IR for Function ------------------------------------------- */
Function *PrototypeAST::codegen()
{
argsize = Args.size();
/* pass previous variables as pointers */
if (context.id > 0)
for (std::map<std::string, std::pair<Type *, AllocaInst *>>::iterator it = (context.getTop())->getInherited()[Name].begin(); it != (context.getTop())->getInherited()[Name].end(); ++it)
Args.push_back(std::pair<std::string, Type *>(it->first, (it->second).first));
std::vector<Type *> argTypes = getArgsTypes();
FunctionType *FT =
FunctionType::get(getType(), makeArrayRef(argTypes), false);
Function *F =
Function::Create(FT, Function::ExternalLinkage, Name, TheModule.get());
// Set names for all arguments.
unsigned Idx = 0;
for (auto &Arg : F->args())
Arg.setName(Args[Idx++].first);
return F;
}
Function *VarDef::codegen()
{
return nullptr;
}
// IR for ( ⟨local-def⟩ )* ⟨compound-stmt⟩
Value *FuncBody_AST::codegen()
{
Function *TheFunction = Builder.GetInsertBlock()->getParent();
// <local-def>
for (unsigned i = 0, e = VarNames.size(); i != e; ++i)
{
// <var-def>
if (dynamic_cast<VarDef *>(VarNames[i]) != nullptr)
{
VarDef *temp = dynamic_cast<VarDef *>(VarNames[i]);
const std::string &VarName = temp->vdef.first;
Type *t = temp->vdef.second;
AllocaInst *Alloca = CreateEntryBlockAlloca(TheFunction, VarName, t);
if ((context.symbol_table()).find(VarName) != (context.symbol_table()).end())