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#include "cps/FunctionGen.h"
#include "cps/CodeGen.h"
#include <cstdio>
using namespace llvm;
using namespace cps;
// Symbols the compiler itself declares (libc + runtime); a user
// FUNCTION/PROCEDURE with one of these names would hijack the runtime.
static bool isReservedRuntimeName(const std::string &Name) {
static const char *Reserved[] = {
"main", "printf", "scanf", "malloc", "free", "strlen", "memcpy",
"strcpy", "strcat", "toupper", "tolower", "sprintf", "strtol",
"strtod", "memset", "exit",
"fopen", "fclose", "fgetc", "ungetc", "fputs", "fputc",
"realloc", "strcmp",
};
for (const char *R : Reserved) {
if (Name == R) return true;
}
return false;
}
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<ParamDecl> &Params) {
Function::arg_iterator AI = F->arg_begin();
for (const ParamDecl &P : Params) {
if (Types.lookupEnumConstant(P.Name)) {
fprintf(stderr, "error: parameter '%s' collides with an enum value\n", P.Name.c_str());
HadError = true;
}
if (Types.resolve(P.Name)) {
fprintf(stderr, "error: parameter '%s' collides with a type name\n", P.Name.c_str());
HadError = true;
}
Value *ArgVal = &(*AI);
++AI;
ArgVal->setName(P.Name);
if (P.IsArray) {
// Data pointer + kBoundArgsPerDim bounds per dimension; binding
// into the array subsystem is delegated to the injected binder.
std::vector<Value*> LBs, UBs;
for (int D = 1; D <= P.Rank; ++D) {
Value *LB = &(*AI);
++AI;
LB->setName(P.Name + kLowerBoundSuffix + std::to_string(D));
Value *UB = &(*AI);
++AI;
UB->setName(P.Name + kUpperBoundSuffix + std::to_string(D));
LBs.push_back(LB);
UBs.push_back(UB);
}
if (BindArrayParam) BindArrayParam(P, ArgVal, LBs, UBs);
continue;
}
if (P.Mode == PassMode::ByRef) {
Symbols[P.Name] = {ArgVal, P.TypeName, false};
continue;
}
Type *ArgType = getLLVMType(P.TypeName);
IRBuilder<> TmpB(&F->getEntryBlock(), F->getEntryBlock().begin());
AllocaInst *Alloca = TmpB.CreateAlloca(ArgType, nullptr, P.Name);
Builder.CreateStore(ArgVal, Alloca);
Symbols[P.Name] = {Alloca, P.TypeName, false};
}
}
const FuncSig *FunctionGen::getSignature(const std::string &Name) const {
auto It = Signatures.find(Name);
return It == Signatures.end() ? nullptr : &It->second;
}
Function *FunctionGen::emitPrototype(PrototypeAST *Proto) {
if (isReservedRuntimeName(Proto->getName())) {
fprintf(stderr, "error: '%s' is a reserved runtime symbol and cannot be a FUNCTION/PROCEDURE name\n",
Proto->getName().c_str());
HadError = true;
return nullptr;
}
if (CodeGen::isBuiltinName(Proto->getName())) {
fprintf(stderr, "error: '%s' is a built-in function and cannot be redefined\n",
Proto->getName().c_str());
HadError = true;
return nullptr;
}
if (Types.lookupEnumConstant(Proto->getName())) {
fprintf(stderr, "error: '%s' is an enum value and cannot be a FUNCTION/PROCEDURE name\n",
Proto->getName().c_str());
HadError = true;
return nullptr;
}
if (Types.resolve(Proto->getName())) {
fprintf(stderr, "error: '%s' is a type name and cannot be a FUNCTION/PROCEDURE name\n",
Proto->getName().c_str());
HadError = true;
return nullptr;
}
FuncSig Sig;
Sig.ReturnTypeName = Proto->getReturnType();
std::vector<Type*> ArgTypes;
for (const ParamDecl &P : Proto->getParams()) {
ParamSig PS;
PS.TypeName = P.TypeName;
PS.IsByRef = P.Mode == PassMode::ByRef;
PS.IsArray = P.IsArray;
PS.Rank = P.Rank;
PS.DeclaredBounds = P.DeclaredBounds;
if (P.IsArray) {
getLLVMType(P.TypeName); // diagnose an unknown element type
ArgTypes.push_back(PointerType::getUnqual(Context)); // data pointer
for (unsigned D = 0; D < static_cast<unsigned>(P.Rank) * kBoundArgsPerDim; ++D) {
ArgTypes.push_back(Type::getInt64Ty(Context));
}
} else {
Type *T = getLLVMType(P.TypeName);
if (PS.IsByRef) {
T = T->getPointerTo();
}
ArgTypes.push_back(T);
}
Sig.Params.push_back(std::move(PS));
}
Type *RetType = getLLVMType(Proto->getReturnType());
FunctionType *FT = FunctionType::get(RetType, ArgTypes, false);
Function *F = Module.getFunction(Proto->getName());
if (F && F->getFunctionType() != FT) {
fprintf(stderr, "error: Function %s conflicts with an existing declaration of a different type\n",
Proto->getName().c_str());
HadError = true;
return nullptr;
}
if (!F) {
F = Function::Create(FT, Function::ExternalLinkage, Proto->getName(), &Module);
}
// Keep the first registration: on a duplicate definition the first one
// wins and the second is rejected by emitFunctionDef.
Signatures.emplace(Proto->getName(), std::move(Sig));
Function::arg_iterator AI = F->arg_begin();
for (const ParamDecl &P : Proto->getParams()) {
if (AI == F->arg_end()) break;
(AI++)->setName(P.Name);
for (int D = 1; P.IsArray && D <= P.Rank && AI != F->arg_end(); ++D) {
(AI++)->setName(P.Name + kLowerBoundSuffix + std::to_string(D));
if (AI != F->arg_end())
(AI++)->setName(P.Name + kUpperBoundSuffix + std::to_string(D));
}
}
return F;
}
Function *FunctionGen::emitFunctionDef(FunctionDefAST *FuncAST,
const std::function<void(StmtAST*)> &StmtEmitter) {
PrototypeAST *Proto = FuncAST->getProto();
Function *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, SymbolInfo> OldSymbols = Symbols;
Symbols.clear();
createArgumentAllocas(TheFunction, Proto->getParams());
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()));
}
}
Symbols = OldSymbols;
return TheFunction;
}
static Value *GenerateCall(llvm::Module &Module,
llvm::IRBuilder<> &Builder,
const std::string &CalleeName,
const std::vector<llvm::Value*> &Args,
bool &HadError) {
Function *CalleeF = Module.getFunction(CalleeName);
if (!CalleeF) {
fprintf(stderr, "error: Call to undefined function %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, Call->getCallee(), Args, HadError);
}
void FunctionGen::emitCallStmt(CallStmtAST *Call, const std::vector<llvm::Value*> &Args) {
GenerateCall(Module, Builder, Call->getCallee(), Args, HadError);
}
void FunctionGen::emitReturn(ReturnStmtAST *Ret, llvm::Value *RetVal) {
if (RetVal) {
Builder.CreateRet(RetVal);
} else {
Builder.CreateRetVoid();
}
}
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