llvm/llvm/examples/BrainF/BrainF.cpp

//===-- BrainF.cpp - BrainF compiler example ------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This class compiles the BrainF language into LLVM assembly.
//
// The BrainF language has 8 commands:
// Command   Equivalent C    Action
// -------   ------------    ------
// ,         *h=getchar();   Read a character from stdin, 255 on EOF
// .         putchar(*h);    Write a character to stdout
// -         --*h;           Decrement tape
// +         ++*h;           Increment tape
// <         --h;            Move head left
// >         ++h;            Move head right
// [         while(*h) {     Start loop
// ]         }               End loop
//
//===----------------------------------------------------------------------===//

#include "BrainF.h"
#include "llvm/ADT/APInt.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include <cstdlib>
#include <iostream>

usingnamespacellvm;

//Set the constants for naming
const char *BrainF::tapereg = …;
const char *BrainF::headreg = …;
const char *BrainF::label   = …;
const char *BrainF::testreg = …;

Module *BrainF::parse(std::istream *in1, int mem, CompileFlags cf,
                      LLVMContext& Context) { … }

void BrainF::header(LLVMContext& C) { … }

void BrainF::readloop(PHINode *phi, BasicBlock *oldbb, BasicBlock *testbb,
                      LLVMContext &C) { … }