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/**
* lisp-compiler: Compiles LISP using LLVM.
* Copyright (C) 2022 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
* @file ast.cpp
* @brief Abstract Syntax Tree (AST) implementation.
*/
#include "ast.hpp"
#include "state.hpp"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Type.h"
#include <algorithm>
#include <any>
#include <cctype>
#include <cstdio>
#include <deque>
#include <iostream>
#include <map>
#include <optional>
#include <string>
#include <typeinfo>
#include <variant>
#include <vector>
AST::Value AST::Identifier::codegen(CompilerState& state)
{
if (state.namedValues.contains(name))
return state.namedValues[name];
else
return nullptr;
}
AST::Value AST::Literal::codegen(CompilerState& state)
{
if (type == AST::Literal::Type::Number) {
if (std::holds_alternative<int>(value))
return llvm::ConstantInt::get(state.context, llvm::APInt(sizeof(int) * 8, std::get<int>(value)));
else
return llvm::ConstantFP::get(state.context, llvm::APFloat(std::get<double>(value)));
} else {
return nullptr;
}
}
AST::Value AST::ProcedureCall::codegen(CompilerState& state)
{
if (auto id = dynamic_cast<AST::Identifier *>(callee); id) {
if (state.namedValues.contains(id->name)) {
auto ptrToFuncPtr = state.namedValues[id->name];
auto funcPtr = state.builder.CreateLoad(
ptrToFuncPtr->getType()->getContainedType(0),
ptrToFuncPtr);
auto funcType = (llvm::FunctionType *)funcPtr->getType()->getContainedType(0);
return state.builder.CreateCall(funcType, funcPtr, llvm::None, "calltmp");
} else {
std::vector<llvm::Value *> args;
std::vector<llvm::Type *> argtypes;
for (auto& a : operands) {
auto gen = a->codegen(state);
args.push_back(gen);
argtypes.push_back(gen ? gen->getType() : llvm::Type::getVoidTy(state.context));
}
auto func = state.module.getOrInsertFunction(id->name,
llvm::FunctionType::get(
llvm::Type::getVoidTy(state.context),
argtypes,
false));
return state.builder.CreateCall(func, args);
}
// work off of id's name
// builtin?
// named value? (i.e. is defined)
return nullptr;
} else if (auto v = callee->codegen(state); v) {
// v needs to be a callable procedure
//std::vector<Node *> operands;
return nullptr;
} else {
return nullptr;
}
}
AST::Value AST::LambdaExpression::codegen(CompilerState& state)
{
std::vector<llvm::Type *> args;
std::vector<std::string> argnames;
for (auto& op : operands) {
args.push_back(llvm::Type::getDoubleTy(state.context));
argnames.push_back(op->name);
}
auto ftype = llvm::FunctionType::get(
llvm::Type::getDoubleTy(state.context), args, false);
auto func = llvm::Function::Create(
ftype, llvm::Function::ExternalLinkage, "lambda", &state.module);
auto n = argnames.cbegin();
for (auto& a : func->args()) {
a.setName(*n);
state.namedValues[*n] = &a;
++n;
}
auto block = llvm::BasicBlock::Create(state.context, "entry", func);
auto ip = state.builder.saveIP();
state.builder.SetInsertPoint(block);
++state.scope;
llvm::Value *ret;
for (auto& b : body)
ret = b->codegen(state);
if (ret)
state.builder.CreateRet(ret);
else
state.builder.CreateRetVoid();
--state.scope;
state.builder.restoreIP(ip);
for (auto& a : argnames)
state.namedValues.erase(a);
return func;
}
AST::Value AST::Conditional::codegen(CompilerState& state)
{
auto cval = state.builder.CreateFCmpONE(
cond->codegen(state),
llvm::ConstantFP::get(state.context, llvm::APFloat(0.0)),
"ifcond");
auto func = state.builder.GetInsertBlock()->getParent();
auto bthen = llvm::BasicBlock::Create(state.context, "then", func);
auto belse = llvm::BasicBlock::Create(state.context, "else", func);
auto bcont = llvm::BasicBlock::Create(state.context, "cont", func);
state.builder.CreateCondBr(cval, bthen, belse);
state.builder.SetInsertPoint(bthen);
auto vthen = iftrue->codegen(state);
if (!vthen || vthen->getType() != llvm::Type::getDoubleTy(state.context))
vthen = llvm::ConstantFP::get(state.context, llvm::APFloat(0.0));
state.builder.CreateBr(bcont);
state.builder.SetInsertPoint(belse);
auto velse = iffalse->codegen(state);
if (!velse || velse->getType() != llvm::Type::getDoubleTy(state.context))
velse = llvm::ConstantFP::get(state.context, llvm::APFloat(0.0));
state.builder.CreateBr(bcont);
state.builder.SetInsertPoint(bcont);
auto PN = state.builder.CreatePHI(
llvm::Type::getDoubleTy(state.context), 2, "iftmp");
PN->addIncoming(vthen, bthen);
PN->addIncoming(velse, belse);
return PN;
}
AST::Value AST::Definition::codegen(CompilerState& state)
{
if (!state.namedValues.contains(ident->name)) {
if (state.scope == 0) {
auto val = (llvm::Constant *)value->codegen(state);
state.module.getOrInsertGlobal(ident->name, val->getType());
auto var = state.module.getNamedGlobal(ident->name);
var->setLinkage(llvm::Function::ExternalLinkage);
var->setInitializer(val);
state.namedValues[ident->name] = var;
return var;
} else {
auto alloc = state.builder.CreateAlloca(
llvm::Type::getDoubleTy(state.context),
nullptr,
ident->name);
state.builder.CreateStore(value->codegen(state), alloc);
state.namedValues[ident->name] = alloc;
return alloc;
}
} else {
return nullptr;
}
}
AST::Value AST::Assignment::codegen(CompilerState& state)
{
if (state.scope > 0) {
if (state.namedValues.contains(ident->name)) {
return state.builder.CreateStore(value->codegen(state), state.namedValues[ident->name]);
}
}
return nullptr;
}
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