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annotate examples/BrainF/BrainFDriver.cpp @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children 3a76565eade5
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1 //===-- BrainFDriver.cpp - BrainF compiler driver -------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This program converts the BrainF language into LLVM assembly,
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11 // which it can then run using the JIT or output as BitCode.
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12 //
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13 // This implementation has a tape of 65536 bytes,
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14 // with the head starting in the middle.
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15 // Range checking is off by default, so be careful.
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16 // It can be enabled with -abc.
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17 //
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18 // Use:
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19 // ./BrainF -jit prog.bf #Run program now
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20 // ./BrainF -jit -abc prog.bf #Run program now safely
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21 // ./BrainF prog.bf #Write as BitCode
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22 //
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23 // lli prog.bf.bc #Run generated BitCode
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24 //
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25 //===----------------------------------------------------------------------===//
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26
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27 #include "BrainF.h"
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28 #include "llvm/ADT/APInt.h"
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29 #include "llvm/Bitcode/BitcodeWriter.h"
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30 #include "llvm/ExecutionEngine/ExecutionEngine.h"
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31 #include "llvm/ExecutionEngine/GenericValue.h"
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32 #include "llvm/ExecutionEngine/MCJIT.h"
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33 #include "llvm/IR/BasicBlock.h"
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34 #include "llvm/IR/Constants.h"
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35 #include "llvm/IR/DerivedTypes.h"
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36 #include "llvm/IR/Function.h"
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37 #include "llvm/IR/Instructions.h"
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38 #include "llvm/IR/LLVMContext.h"
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39 #include "llvm/IR/Module.h"
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40 #include "llvm/IR/Value.h"
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41 #include "llvm/IR/Verifier.h"
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42 #include "llvm/Support/Casting.h"
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43 #include "llvm/Support/CommandLine.h"
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44 #include "llvm/Support/FileSystem.h"
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45 #include "llvm/Support/ManagedStatic.h"
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46 #include "llvm/Support/TargetSelect.h"
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47 #include "llvm/Support/raw_ostream.h"
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48 #include <algorithm>
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49 #include <cstdlib>
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50 #include <fstream>
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51 #include <iostream>
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52 #include <memory>
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53 #include <string>
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54 #include <system_error>
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55 #include <vector>
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56
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57 using namespace llvm;
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58
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59 //Command line options
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60
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61 static cl::opt<std::string>
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62 InputFilename(cl::Positional, cl::desc("<input brainf>"));
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63
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64 static cl::opt<std::string>
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65 OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
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66
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67 static cl::opt<bool>
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68 ArrayBoundsChecking("abc", cl::desc("Enable array bounds checking"));
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69
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70 static cl::opt<bool>
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71 JIT("jit", cl::desc("Run program Just-In-Time"));
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72
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73 //Add main function so can be fully compiled
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74 void addMainFunction(Module *mod) {
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75 //define i32 @main(i32 %argc, i8 **%argv)
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76 Function *main_func = cast<Function>(mod->
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77 getOrInsertFunction("main", IntegerType::getInt32Ty(mod->getContext()),
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78 IntegerType::getInt32Ty(mod->getContext()),
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79 PointerType::getUnqual(PointerType::getUnqual(
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80 IntegerType::getInt8Ty(mod->getContext())))));
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81 {
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82 Function::arg_iterator args = main_func->arg_begin();
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83 Value *arg_0 = &*args++;
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84 arg_0->setName("argc");
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85 Value *arg_1 = &*args++;
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86 arg_1->setName("argv");
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87 }
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88
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89 //main.0:
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90 BasicBlock *bb = BasicBlock::Create(mod->getContext(), "main.0", main_func);
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91
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92 //call void @brainf()
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93 {
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94 CallInst *brainf_call = CallInst::Create(mod->getFunction("brainf"),
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95 "", bb);
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96 brainf_call->setTailCall(false);
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97 }
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98
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99 //ret i32 0
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100 ReturnInst::Create(mod->getContext(),
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101 ConstantInt::get(mod->getContext(), APInt(32, 0)), bb);
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102 }
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103
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104 int main(int argc, char **argv) {
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105 cl::ParseCommandLineOptions(argc, argv, " BrainF compiler\n");
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106
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107 LLVMContext Context;
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108
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109 if (InputFilename == "") {
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110 errs() << "Error: You must specify the filename of the program to "
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111 "be compiled. Use --help to see the options.\n";
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112 abort();
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113 }
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114
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115 //Get the output stream
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116 raw_ostream *out = &outs();
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117 if (!JIT) {
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118 if (OutputFilename == "") {
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119 std::string base = InputFilename;
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120 if (InputFilename == "-") { base = "a"; }
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121
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122 // Use default filename.
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123 OutputFilename = base+".bc";
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124 }
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125 if (OutputFilename != "-") {
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126 std::error_code EC;
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127 out = new raw_fd_ostream(OutputFilename, EC, sys::fs::F_None);
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128 }
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129 }
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130
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131 //Get the input stream
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132 std::istream *in = &std::cin;
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133 if (InputFilename != "-")
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134 in = new std::ifstream(InputFilename.c_str());
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135
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136 //Gather the compile flags
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137 BrainF::CompileFlags cf = BrainF::flag_off;
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138 if (ArrayBoundsChecking)
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139 cf = BrainF::CompileFlags(cf | BrainF::flag_arraybounds);
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140
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141 //Read the BrainF program
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142 BrainF bf;
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143 std::unique_ptr<Module> Mod(bf.parse(in, 65536, cf, Context)); // 64 KiB
0
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144 if (in != &std::cin)
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145 delete in;
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146 addMainFunction(Mod.get());
0
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147
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148 //Verify generated code
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149 if (verifyModule(*Mod)) {
0
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150 errs() << "Error: module failed verification. This shouldn't happen.\n";
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151 abort();
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152 }
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153
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154 //Write it out
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155 if (JIT) {
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156 InitializeNativeTarget();
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157 InitializeNativeTargetAsmPrinter();
0
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158
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159 outs() << "------- Running JIT -------\n";
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160 Module &M = *Mod;
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161 ExecutionEngine *ee = EngineBuilder(std::move(Mod)).create();
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162 if (!ee) {
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163 errs() << "Error: execution engine creation failed.\n";
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164 abort();
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165 }
0
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166 std::vector<GenericValue> args;
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167 Function *brainf_func = M.getFunction("brainf");
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168 GenericValue gv = ee->runFunction(brainf_func, args);
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169 // Genereated code calls putchar, and output is not guaranteed without fflush.
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170 // The better place for fflush(stdout) call would be the generated code, but it
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171 // is unmanageable because stdout linkage name depends on stdlib implementation.
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172 fflush(stdout);
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173 } else {
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174 WriteBitcodeToFile(Mod.get(), *out);
0
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175 }
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176
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177 //Clean up
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178 if (out != &outs())
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179 delete out;
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180
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181 llvm_shutdown();
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182
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183 return 0;
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184 }