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#include "cps/FunctionGen.h"
#include "llvm/IR/Verifier.h"
#include <cstdio>
using namespace llvm;
using namespace cps;
Type *FunctionGen::getLLVMType(const std::string &TypeName) {
Type *Resolved = Types.getLLVMType(TypeName);
if (!Resolved) {
fprintf(stderr, "Error: Unknown type %s\n", TypeName.c_str());
HadError = true;
return Type::getInt64Ty(Context);
}
return Resolved;
}
void FunctionGen::createArgumentAllocas(Function *F, const std::vector<std::tuple<std::string, std::string, bool>> &Args) {
Function::arg_iterator AI = F->arg_begin();
for (unsigned Idx = 0, E = Args.size(); Idx != E; ++Idx, ++AI) {
std::string ArgName = std::get<0>(Args[Idx]);
std::string ArgTypeStr = std::get<1>(Args[Idx]);
bool IsRef = std::get<2>(Args[Idx]);
Value *ArgVal = &(*AI);
ArgVal->setName(ArgName);
if (IsRef) {
NamedValues[ArgName] = ArgVal;
Symbols[ArgName] = {ArgVal, ArgTypeStr, false};
continue;
}
Type *ArgType = getLLVMType(ArgTypeStr);
IRBuilder<> TmpB(&F->getEntryBlock(), F->getEntryBlock().begin());
AllocaInst *Alloca = TmpB.CreateAlloca(ArgType, nullptr, ArgName);
Builder.CreateStore(ArgVal, Alloca);
NamedValues[ArgName] = Alloca;
Symbols[ArgName] = {Alloca, ArgTypeStr, false};
}
}
Function *FunctionGen::emitPrototype(PrototypeAST *Proto) {
std::vector<Type*> ArgTypes;
for (const auto &Arg : Proto->getArgs()) {
Type *T = getLLVMType(std::get<1>(Arg));
if (std::get<2>(Arg)) {
T = T->getPointerTo();
}
ArgTypes.push_back(T);
}
Type *RetType = getLLVMType(Proto->getReturnType());
FunctionType *FT = FunctionType::get(RetType, ArgTypes, false);
Function *F = Module.getFunction(Proto->getName());
if (!F) {
F = Function::Create(FT, Function::ExternalLinkage, Proto->getName(), &Module);
}
unsigned Idx = 0;
for (auto &Arg : F->args()) {
if (Idx < Proto->getArgs().size()) {
Arg.setName(std::get<0>(Proto->getArgs()[Idx++]));
}
}
return F;
}
Function *FunctionGen::emitFunctionDef(FunctionDefAST *FuncAST,
const std::function<void(StmtAST*)> &StmtEmitter) {
PrototypeAST *Proto = FuncAST->getProto();
Function *TheFunction = Module.getFunction(Proto->getName());
if (!TheFunction) {
TheFunction = emitPrototype(Proto);
}
if (!TheFunction) return nullptr;
if (!TheFunction->empty()) {
fprintf(stderr, "Error: Function %s cannot be redefined.\n", Proto->getName().c_str());
HadError = true;
return nullptr;
}
BasicBlock *BB = BasicBlock::Create(Context, "entry", TheFunction);
Builder.SetInsertPoint(BB);
std::map<std::string, llvm::Value*> OldNamedValues = NamedValues;
std::map<std::string, SymbolInfo> OldSymbols = Symbols;
NamedValues.clear();
Symbols.clear();
createArgumentAllocas(TheFunction, Proto->getArgs());
for (const auto &Stmt : FuncAST->getBody()) {
StmtEmitter(Stmt.get());
}
if (!Builder.GetInsertBlock()->getTerminator()) {
if (Proto->getReturnType() == "VOID") {
Builder.CreateRetVoid();
} else {
Builder.CreateRet(Constant::getNullValue(TheFunction->getReturnType()));
}
}
NamedValues = OldNamedValues;
Symbols = OldSymbols;
return TheFunction;
}
static Value *GenerateCall(llvm::Module &Module,
llvm::IRBuilder<> &Builder,
llvm::LLVMContext &Context,
const std::string &CalleeName,
const std::vector<llvm::Value*> &Args,
bool &HadError) {
Function *CalleeF = Module.getFunction(CalleeName);
if (!CalleeF) {
std::vector<Type*> ArgTypes;
for (auto *Val : Args) ArgTypes.push_back(Val->getType());
FunctionType *FT = FunctionType::get(Type::getInt64Ty(Context), ArgTypes, false);
CalleeF = Function::Create(FT, Function::ExternalLinkage, CalleeName, &Module);
}
if (CalleeF->arg_size() != Args.size()) {
fprintf(stderr, "Error: Incorrect # arguments passed to %s\n", CalleeName.c_str());
HadError = true;
return nullptr;
}
if (CalleeF->getReturnType()->isVoidTy()) {
return Builder.CreateCall(CalleeF, Args);
}
return Builder.CreateCall(CalleeF, Args, "calltmp");
}
llvm::Value *FunctionGen::emitCallExpr(CallExprAST *Call, const std::vector<llvm::Value*> &Args) {
return GenerateCall(Module, Builder, Context, Call->getCallee(), Args, HadError);
}
void FunctionGen::emitCallStmt(CallStmtAST *Call, const std::vector<llvm::Value*> &Args) {
GenerateCall(Module, Builder, Context, Call->getCallee(), Args, HadError);
}
void FunctionGen::emitReturn(ReturnStmtAST *Ret, llvm::Value *RetVal) {
if (RetVal) {
Builder.CreateRet(RetVal);
} else {
Builder.CreateRetVoid();
}
}
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