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/**
* forspll - LLVM-based Forsp compiler
* Copyright (C) 2024 Clyne Sullivan <clyne@bitgloo.com>
*
* 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/>.
*/
#include "ast.hpp"
#include <charconv>
#include <iostream>
extern std::list<ThunkAST> scope;
int ThunkAST::tcount = 0;
int ThunkAST::envidx = 0;
static inline auto loadEnv(LLVMState& llvmState, llvm::Value *index)
{
auto ptrty = llvmState.inttype->getPointerTo();
auto gep = llvmState.builder.CreateGEP(ptrty, scope.back().env, {index});
return llvmState.builder.CreateLoad(ptrty, gep);
}
static inline auto storeEnv(LLVMState& llvmState, llvm::Value *index, llvm::Value *val)
{
auto ptrty = llvmState.inttype->getPointerTo();
auto var = llvmState.builder.CreateGEP(ptrty, scope.back().env, {index});
return llvmState.builder.CreateStore(val, var, false);
}
NumberAST::NumberAST(const std::string& n): BaseAST(n) {}
llvm::Value *NumberAST::codegen(LLVMState& llvmState) const
{
int value;
auto [ptr, _] = std::from_chars(&name.front(), &name.back() + 1, value);
if (ptr <= &name.back()) {
std::cerr << "error: not a number: " << name << std::endl;
return nullptr;
} else {
auto val = llvmState.createInt(value);
return llvmState.createPush(val);
}
}
PushAST::PushAST(const std::string& n): BaseAST(n) {}
llvm::Value *PushAST::codegen(LLVMState& llvmState) const
{
if (auto [var, native] = Var::lookup(name, 1); var) {
auto index = llvm::ConstantInt::get(llvmState.inttype, ThunkAST::envidx++);
Var::addLocal(name, index);
}
if (auto [var, native] = Var::lookupLocal(name); var) {
if (!native)
var = loadEnv(llvmState, var);
return llvmState.createPush(var);
} else {
std::cerr << "error: not defined: " << name << std::endl;
return nullptr;
}
}
PopAST::PopAST(const std::string& n): BaseAST(n) {}
llvm::Value *PopAST::codegen(LLVMState& llvmState) const
{
Var v;
if (name == "self") {
v = {scope.back().func, true};
} else {
auto index = llvm::ConstantInt::get(llvmState.inttype, ThunkAST::envidx++);
auto pop = llvmState.createPop();
storeEnv(llvmState, index, pop);
v = index;
}
return Var::addLocal(name, v).value;
}
CallAST::CallAST(const std::string& n): BaseAST(n) {}
llvm::Value *CallAST::codegen(LLVMState& llvmState) const
{
if (auto [var, native] = Var::lookup(name, 1); var && !native) {
auto index = llvm::ConstantInt::get(llvmState.inttype, ThunkAST::envidx++);
Var::addLocal(name, index);
}
llvm::Value *fn;
if (auto [var, native] = Var::lookup(name); var) {
if (!native)
var = loadEnv(llvmState, var);
fn = var;
} else {
std::cerr << "warning: anticipating external function: "
<< name << std::endl;
fn = llvmState.createFunction(name);
Var::addGlobal(name, Var {fn, true});
}
auto ptrty = llvmState.inttype->getPointerTo();
llvm::Type *type;
llvm::Value *mem;
if (auto sz = Var::vars.back().size(); sz > 0) {
type = llvm::VectorType::get(llvmState.inttype, sz, false);
mem = llvmState.builder.CreateAlloca(type, nullptr);
int i = 0;
for (auto& [_, v] : Var::vars.back()) {
if (!v.native) {
auto index = llvm::ConstantInt::get(llvmState.inttype, i++);
auto m = llvmState.builder.CreateGEP(ptrty, mem, {index});
llvmState.builder.CreateStore(loadEnv(llvmState, v.value), m, false);
}
}
}
auto call = llvmState.builder.CreateCall(llvmState.ftype, fn, llvm::ArrayRef {scope.back().env});
if (auto sz = Var::vars.back().size(); sz > 0) {
int i = 0;
for (auto& [_, v] : Var::vars.back()) {
if (!v.native) {
auto index = llvm::ConstantInt::get(llvmState.inttype, i++);
auto m = llvmState.builder.CreateGEP(ptrty, mem, {index});
auto l = llvmState.builder.CreateLoad(ptrty, m);
storeEnv(llvmState, v.value, l);
}
}
}
return call;
}
ThunkAST::ThunkAST(LLVMState& llvmState):
ThunkAST(llvmState, std::string("__t") + std::to_string(tcount++)) {}
ThunkAST::ThunkAST(LLVMState& llvmState, std::string n): BaseAST(n)
{
parent = llvmState.builder.saveIP();
func = llvmState.createFunction(name);
entry = llvmState.createEntry(func);
body = llvm::BasicBlock::Create(llvmState.ctx, "body", func);
env = func->getArg(0);
llvmState.builder.SetInsertPoint(entry);
llvmState.builder.SetInsertPoint(body);
}
llvm::Value *ThunkAST::codegen(LLVMState& llvmState) const
{
llvmState.builder.CreateRetVoid();
llvmState.builder.SetInsertPoint(entry);
if (Var::vars.back().size() > 0) {
for (auto& [n, v] : Var::vars.back()) {
if (auto [c, _] = Var::lookup(n, 1); c) {
auto src = loadEnv(llvmState, c);
storeEnv(llvmState, v.value, src);
}
}
}
llvmState.builder.CreateBr(body);
llvmState.builder.restoreIP(parent);
return func;
}
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