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bitcodegen.cpp
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bitcodegen.cpp
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//
// Created by Gang-Ryung Uh on 11/15/20.
//
#include <regex>
#include <iostream>
#include "quad.h"
#include "sym.h"
#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/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <algorithm>
#include <cassert>
#include <cctype>
#include <cstdio>
#include <cstdlib>
#include <map>
#include <memory>
#include <string>
#include <system_error>
#include <utility>
#include <vector>
using namespace llvm;
typedef SmallVector<BasicBlock *, 16> BBList;
typedef SmallVector<Value *, 16> ValList;
/*
* The order of the declaration of static variables matter.
*/
static LLVMContext TheContext;
static IRBuilder<> Builder(TheContext);
static std::unique_ptr<Module> TheModule;
/* https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/LangImpl08.html#choosing-a-target */
void InitializeModuleAndPassManager() {
auto TargetTriple = sys::getDefaultTargetTriple();
InitializeNativeTarget();
InitializeNativeTargetAsmPrinter();
InitializeNativeTargetAsmParser();
std::string Error;
auto Target = TargetRegistry::lookupTarget(TargetTriple, Error);
if (!Target) {
errs() << Error;
exit(1);
}
auto CPU = "generic";
auto Features = "";
TargetOptions opt;
auto RM = Optional<Reloc::Model>();
auto TargetMachine = Target->createTargetMachine(
TargetTriple, CPU, Features, opt, RM);
// Open a new module.
TheModule = std::make_unique<Module>("QuadReader", TheContext);
TheModule->setDataLayout(TargetMachine->createDataLayout());
TheModule->setTargetTriple(TargetTriple);
// We rely on printf function call
char str[] = "printf";
struct id_entry *iptr = install(str, GLOBAL);
FunctionType* printfTy = FunctionType::get(Builder.getInt32Ty(),
Builder.getInt8PtrTy(), true);
iptr->v.f = Function::Create(printfTy,Function::ExternalLinkage,
str, *TheModule);
iptr->v.f->setCallingConv(CallingConv::C);
iptr->v.f->getArg(0)->setName("f");
}
void OutputModule() {
TheModule->print(outs(), nullptr);
}
static
void createGlobal(struct id_entry *iptr) {
if (iptr->i_type & T_ARRAY) {
if (iptr->i_type & T_INT) {
auto vecType = ArrayType::get(
Type::getInt32Ty(TheContext),iptr->i_numelem);
iptr->u.ltype = vecType;
}
else {
auto vecType = ArrayType::get(
Type::getDoubleTy(TheContext),iptr->i_numelem);
iptr->u.ltype = vecType;
}
}
else {
if (iptr->i_type & T_INT)
iptr->u.ltype = Builder.getInt32Ty();
else
iptr->u.ltype = Builder.getDoubleTy();
}
TheModule->getOrInsertGlobal(iptr->i_name, iptr->u.ltype);
iptr->gvar = TheModule->getNamedGlobal(iptr->i_name);
iptr->gvar->setLinkage(GlobalVariable::CommonLinkage);
iptr->gvar->setAlignment(MaybeAlign(16));
if (iptr->u.ltype->isArrayTy())
iptr->gvar->setInitializer(ConstantAggregateZero::get(iptr->u.ltype));
}
static
void createFunction(struct id_entry *fn, struct quadline **ptr) {
std::vector<std::string> args;
std::vector<llvm::Type *> typeVec;
for (*ptr = (*ptr)->next; *ptr && (*ptr)->type == FORMAL_ALLOC; *ptr = (*ptr)->next) {
auto iptr = lookup((*ptr)->items[1], PARAM);
assert(iptr && "parameter is missing");
if (iptr->i_type & T_INT) {
iptr->u.ltype = Builder.getInt32Ty();
}
else {
iptr->u.ltype = Builder.getDoubleTy();
}
typeVec.push_back(iptr->u.ltype);
args.push_back(iptr->i_name);
}
if (fn->i_type & T_INT)
fn->u.ftype = FunctionType::get(Builder.getInt32Ty(),
typeVec, false);
else
fn->u.ftype = FunctionType::get(Builder.getDoubleTy(),
typeVec, false);
Function *F =
Function::Create(fn->u.ftype, Function::ExternalLinkage,
fn->i_name, TheModule.get());
unsigned Idx=0;
for (auto &Arg:F->args())
Arg.setName(args[Idx++]);
fn->v.f = F;
}
static
void allocaFormals(struct quadline **ptr, llvm::Function *fn) {
for (; (*ptr != NULL) && ((*ptr)->type == FORMAL_ALLOC);
*ptr = (*ptr)->next) {
auto id_ptr = lookup((*ptr)->items[1], PARAM);
assert(id_ptr && "local is missing");
//Kaleidoscope addresses the initializer at this point, but we can't do that yet...
id_ptr->v.v = Builder.CreateAlloca(
id_ptr->u.ltype,nullptr, id_ptr->i_name);
for (auto &Arg: fn->args()) {
auto name = Arg.getName();
if (strcmp(name.data(), id_ptr->i_name) == 0) {
Builder.CreateStore(&Arg, id_ptr->v.v);
break;
}
}
}
}
static
void allocaLocals(struct quadline **ptr) {
for (; (*ptr != NULL) && ((*ptr)->type == LOCAL_ALLOC);
*ptr = (*ptr)->next) {
auto id_ptr = lookup((*ptr)->items[1], LOCAL);
assert(id_ptr && "local is missing");
if (id_ptr->i_type & T_INT)
id_ptr->v.v = Builder.CreateAlloca(llvm::Type::getInt32Ty(
TheContext), nullptr, id_ptr->i_name);
else
id_ptr->v.v = Builder.CreateAlloca(llvm::Type::getDoubleTy(
TheContext), nullptr, id_ptr->i_name);
}
}
void createLoad(struct quadline *ptr) {
auto loadAddr = lookup(ptr->items[3], LOCAL);
auto loadVal = install(ptr->items[0], LOCAL);
assert(loadAddr && loadVal && "Load instruction generation fails");
loadVal->v.v = Builder.CreateLoad(loadAddr->v.v,ptr->items[0]);
return;
}
void createBitcode(struct quadline *ptr, struct id_entry *fn) {
std::cerr << "You need to implement this routine" << std::endl;
return;
}
void bitcodegen() {
struct bblk *blk;
struct quadline *ptr;
struct id_entry *iptr;
extern struct bblk *top;
// any global, then define
for (ptr = top->lines; ptr && ptr->type == GLOBAL_ALLOC; ptr=ptr->next) {
iptr = lookup(ptr->items[1],GLOBAL);
assert(iptr && "global is not defined");
createGlobal(iptr);
}
// generate function signature
assert(ptr && (ptr->type == FUNC_BEGIN) && "Function definition is expected");
auto fn = lookup(ptr->items[1], GLOBAL);
assert(fn && "function name is not present");
createFunction(fn, &ptr);
BasicBlock *BB = BasicBlock::Create(TheContext, "entry", fn->v.f);
top->lbblk = BB;
Builder.SetInsertPoint(BB);
// allocate storage for the param
// allocate storage for locals
// generate bitcode for globals, function header, params, and locals
for (; ptr->prev && ptr->prev->type == FORMAL_ALLOC; ptr=ptr->prev);
allocaFormals(&ptr, fn->v.f);
allocaLocals(&ptr);
createBitcode(ptr,fn);
for (auto bblk = top->down; bblk ; bblk=bblk->down) {
auto bb = lookup(bblk->label, LOCAL);
if (bb->v.b == nullptr)
bb->v.b = BasicBlock::Create(TheContext, bblk->label, fn->v.f);
Builder.SetInsertPoint(bb->v.b);
createBitcode(bblk->lines, fn);
}
return;
}