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#include <algorithm>
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#include <cctype>
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#include <iostream>
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#include <list>
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#include <map>
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#include <memory>
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#include <set>
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#include <string>
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#include <string_view>
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#include <tuple>
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#include <llvm/ADT/APInt.h>
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#include <llvm/IR/Constants.h>
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#include <llvm/IR/IRBuilder.h>
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#include <llvm/IR/LLVMContext.h>
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#include <llvm/IR/Module.h>
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#include <llvm/IR/Type.h>
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#include <llvm/IR/DerivedTypes.h>
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static std::unique_ptr<llvm::LLVMContext> llvmContext;
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static std::unique_ptr<llvm::Module> llvmModule;
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static std::unique_ptr<llvm::IRBuilder<>> llvmBuilder;
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static llvm::Constant *llvmSp;
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static llvm::Constant *llvmStack;
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struct Var {
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llvm::Value *value;
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bool callable;
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Var(llvm::Value *v = nullptr, bool c = false): value(v), callable(c) {}
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};
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static std::list<std::map<std::string, Var>> llvmVars;
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Var llvmVarGet(const std::string& name, int skip = 0) {
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for (auto sc = llvmVars.rbegin(); sc != llvmVars.rend(); ++sc) {
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if (skip > 0) {
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--skip;
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continue;
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}
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if (sc->contains(name))
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return (*sc)[name];
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}
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return {};
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}
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struct BaseAST
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{
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std::string name;
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BaseAST(const std::string& n): name(n) {}
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virtual ~BaseAST() = default;
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virtual llvm::Value *codegen() const { return nullptr; }
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};
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struct NumberAST : public BaseAST
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{
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// push number onto stack
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explicit NumberAST(const std::string& n): BaseAST(n) {}
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llvm::Value *codegen() const override {
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auto inttype = llvm::Type::getInt32Ty(*llvmContext);
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auto stacktype = llvm::VectorType::get(inttype, 12, false);
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auto dspval = llvmBuilder->CreateLoad(inttype, llvmSp);
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auto one = llvm::ConstantInt::get(inttype, 1);
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auto zero = llvm::ConstantInt::get(inttype, 0);
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auto inc = llvmBuilder->CreateAdd(dspval, one);
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llvmBuilder->CreateStore(inc, llvmSp, false);
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auto dsget = llvmBuilder->CreateGEP(stacktype, llvmStack, {zero, dspval});
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auto val = llvm::ConstantInt::get(*llvmContext, llvm::APInt(32, std::stoi(name), true));
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return llvmBuilder->CreateStore(val, dsget);
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}
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};
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struct PushAST : public BaseAST
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{
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// push named value to stack
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explicit PushAST(const std::string& n): BaseAST(n) {}
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llvm::Value *codegen() const override {
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if (auto [var, thunk] = llvmVarGet(name); var) {
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auto inttype = llvm::Type::getInt32Ty(*llvmContext);
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auto stacktype = llvm::VectorType::get(inttype, 12, false);
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auto dspval = llvmBuilder->CreateLoad(inttype, llvmSp);
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auto one = llvm::ConstantInt::get(inttype, 1);
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auto zero = llvm::ConstantInt::get(inttype, 0);
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auto inc = llvmBuilder->CreateAdd(dspval, one);
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llvmBuilder->CreateStore(inc, llvmSp, false);
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auto dsget = llvmBuilder->CreateGEP(stacktype, llvmStack, {zero, dspval});
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if (!thunk)
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var = llvmBuilder->CreateLoad(inttype, var);
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return llvmBuilder->CreateStore(var, dsget);
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} else {
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return nullptr;
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}
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}
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};
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struct PopAST : public BaseAST
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{
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// pop value on stack to named var
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explicit PopAST(const std::string& n): BaseAST(n) {}
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llvm::Value *codegen() const override {
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auto inttype = llvm::Type::getInt32Ty(*llvmContext);
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auto stacktype = llvm::VectorType::get(inttype, 12, false);
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auto one = llvm::ConstantInt::get(inttype, 1);
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auto zero = llvm::ConstantInt::get(inttype, 0);
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auto dspval = llvmBuilder->CreateLoad(inttype, llvmSp);
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auto dec = llvmBuilder->CreateSub(dspval, one);
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auto gep = llvmBuilder->CreateGEP(stacktype, llvmStack, {zero, dec});
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llvmBuilder->CreateStore(dec, llvmSp, false);
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auto var = new llvm::GlobalVariable(*llvmModule, inttype, false, llvm::GlobalValue::InternalLinkage, zero, name);
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llvmBuilder->CreateStore(llvmBuilder->CreateLoad(inttype, gep), var, false);
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auto [it, _] = llvmVars.back().emplace(name, var);
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return it->second.value;
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}
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};
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struct CallAST : public BaseAST
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{
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// invoke named invocable
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explicit CallAST(const std::string& n): BaseAST(n) {}
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llvm::Value *codegen() const override {
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auto ftype = llvm::FunctionType::get(llvm::Type::getVoidTy(*llvmContext), {}, false);
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if (auto [var, call] = llvmVarGet(name); var) {
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if (call) {
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return llvmBuilder->CreateCall(ftype, var);
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} else {
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auto inttype = llvm::Type::getInt32Ty(*llvmContext);
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auto val = llvmBuilder->CreateLoad(inttype, var);
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auto cast = llvmBuilder->CreateIntToPtr(val, inttype->getPointerTo());
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return llvmBuilder->CreateCall(ftype, cast);
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}
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} else {
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auto func = llvm::Function::Create(ftype, llvm::Function::ExternalLinkage, name, llvmModule.get());
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llvmVars.front().emplace(name, Var {func, true});
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return llvmBuilder->CreateCall(ftype, func);
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}
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}
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};
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struct ThunkAST : public BaseAST
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{
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static int tcount;
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std::list<std::unique_ptr<BaseAST>> body;
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llvm::IRBuilderBase::InsertPoint parent;
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llvm::Function *func;
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explicit ThunkAST(): ThunkAST(std::string("__t") + std::to_string(tcount++)) {}
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explicit ThunkAST(std::string n): BaseAST(n) {
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parent = llvmBuilder->saveIP();
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auto ftype = llvm::FunctionType::get(llvm::Type::getVoidTy(*llvmContext), {}, false);
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func = llvm::Function::Create(ftype, llvm::Function::ExternalLinkage, name.c_str(), llvmModule.get());
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auto BB = llvm::BasicBlock::Create(*llvmContext, "entry", func);
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llvmBuilder->SetInsertPoint(BB);
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}
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llvm::Value *codegen() const override {
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llvmBuilder->CreateRetVoid();
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llvmBuilder->restoreIP(parent);
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return func;
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}
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};
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int ThunkAST::tcount = 0;
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enum class Token {
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none,
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ThunkOpen,
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ThunkClose,
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Quote,
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PopVar,
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PushVar,
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Var,
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Number
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};
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static std::string name;
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static std::list<ThunkAST> scope;
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bool isname(char ch) {
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return !isspace(ch) && ch != ')';
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}
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std::string_view extractName(std::string_view sv)
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{
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name.clear();
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while (!sv.empty()) {
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const auto ch = sv.front();
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if (isname(ch)) {
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name += ch;
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sv.remove_prefix(1);
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} else {
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break;
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}
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}
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return sv;
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}
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std::pair<std::string_view, Token> nextToken(std::string_view sv)
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{
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if (sv.empty())
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return {sv, Token::none};
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while (std::isspace(sv.front()))
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sv.remove_prefix(1);
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if (sv.empty())
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return {sv, Token::none};
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const auto ch = sv.front();
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if (ch == ';') {
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return {{}, Token::none};
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} else if (ch == '(') {
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return {sv.substr(1), Token::ThunkOpen};
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} else if (ch == ')') {
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return {sv.substr(1), Token::ThunkClose};
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} else if (ch == '\'') {
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return {extractName(sv.substr(1)), Token::Quote};
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} else if (ch == '$') {
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return {extractName(sv.substr(1)), Token::PopVar};
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} else if (ch == '^') {
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return {extractName(sv.substr(1)), Token::PushVar};
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} else if (isdigit(ch) || (ch == '-' && sv.size() > 1 && isdigit(sv[1]))) {
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return {extractName(sv), Token::Number};
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} else if (isname(ch)) {
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return {extractName(sv), Token::Var};
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}
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return {sv, Token::none};
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}
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void printToken(Token tok)
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{
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switch (tok) {
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case Token::ThunkOpen:
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std::cout << "ThunkOpen ";
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break;
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case Token::ThunkClose:
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std::cout << "ThunkClose ";
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break;
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case Token::Quote:
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std::cout << "Quote ";
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break;
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case Token::PopVar:
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std::cout << "PopVar ";
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break;
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case Token::PushVar:
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std::cout << "PushVar ";
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break;
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case Token::Var:
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std::cout << "Var ";
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break;
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case Token::Number:
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std::cout << "Number ";
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break;
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case Token::none:
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//std::cout << "none ";
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break;
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}
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}
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bool parseString(std::string_view sv)
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{
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do {
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const auto [nsv, tok] = nextToken(sv);
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//printToken(tok);
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if (tok == Token::none && !nsv.empty()) {
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std::cerr << "unknown " << nsv << std::endl;
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break;
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} else {
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std::unique_ptr<BaseAST> expr;
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switch (tok) {
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case Token::ThunkOpen:
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if (scope.empty())
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scope.emplace_back("main");
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else
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scope.emplace_back();
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llvmVars.emplace_back();
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break;
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case Token::ThunkClose:
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{
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auto& thunk = scope.back();
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auto gen = thunk.codegen();
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llvmVars.pop_back();
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llvmVars.back().emplace(thunk.name, Var {gen, true});
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expr.reset(new PushAST {thunk.name});
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scope.pop_back();
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}
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break;
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case Token::Quote:
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break;
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case Token::PopVar:
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expr.reset(new PopAST {name});
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break;
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case Token::PushVar:
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expr.reset(new PushAST {name});
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break;
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case Token::Var:
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expr.reset(new CallAST {name});
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break;
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case Token::Number:
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expr.reset(new NumberAST {name});
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break;
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case Token::none:
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break;
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}
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if (expr && !scope.empty()) {
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expr->codegen();
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//scope.back().body.emplace_back().swap(expr);
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}
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}
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sv = nsv;
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} while (!sv.empty());
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return true;
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}
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int main()
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{
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llvmContext = std::make_unique<llvm::LLVMContext>();
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llvmModule = std::make_unique<llvm::Module>("forsp", *llvmContext);
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llvmBuilder = std::make_unique<llvm::IRBuilder<>>(*llvmContext);
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auto inttype = llvm::Type::getInt32Ty(*llvmContext);
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auto stacktype = llvm::VectorType::get(inttype, 12, false);
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auto zero = llvm::ConstantInt::get(inttype, 0);
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auto zerovec = llvm::ConstantVector::get(llvm::ArrayRef(dynamic_cast<llvm::Constant *>(zero)));
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llvmStack = new llvm::GlobalVariable(*llvmModule, stacktype, false, llvm::GlobalValue::ExternalLinkage, zerovec, "stack");
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llvmSp = new llvm::GlobalVariable(*llvmModule, inttype, false, llvm::GlobalValue::ExternalLinkage, zero, "sp");
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llvmVars.emplace_back();
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std::string line;
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while (std::cin.good()) {
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std::getline(std::cin, line);
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parseString(line);
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//std::cout << std::endl;
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}
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//std::cout << "LLVM:" << std::endl;
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llvmModule->print(llvm::errs(), nullptr);
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std::cout << std::endl;
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}
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