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annotate examples/Fibonacci/fibonacci.cpp @ 15:66597e792247

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minor fix
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 17 Sep 2013 21:32:34 +0900
parents 9ad51c7bc036
children 54457678186b
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1 //===--- examples/Fibonacci/fibonacci.cpp - An example use of the JIT -----===//
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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 small program provides an example of how to build quickly a small module
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11 // with function Fibonacci and execute it with the JIT.
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12 //
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13 // The goal of this snippet is to create in the memory the LLVM module
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14 // consisting of one function as follow:
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15 //
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16 // int fib(int x) {
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17 // if(x<=2) return 1;
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18 // return fib(x-1)+fib(x-2);
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19 // }
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20 //
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21 // Once we have this, we compile the module via JIT, then execute the `fib'
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22 // function and return result to a driver, i.e. to a "host program".
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23 //
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24 //===----------------------------------------------------------------------===//
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25
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26 #include "llvm/Analysis/Verifier.h"
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27 #include "llvm/ExecutionEngine/GenericValue.h"
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28 #include "llvm/ExecutionEngine/Interpreter.h"
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29 #include "llvm/ExecutionEngine/JIT.h"
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30 #include "llvm/IR/Constants.h"
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31 #include "llvm/IR/DerivedTypes.h"
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32 #include "llvm/IR/Instructions.h"
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33 #include "llvm/IR/LLVMContext.h"
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34 #include "llvm/IR/Module.h"
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35 #include "llvm/Support/TargetSelect.h"
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36 #include "llvm/Support/raw_ostream.h"
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37 using namespace llvm;
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38
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39 static Function *CreateFibFunction(Module *M, LLVMContext &Context) {
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40 // Create the fib function and insert it into module M. This function is said
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41 // to return an int and take an int parameter.
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42 Function *FibF =
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43 cast<Function>(M->getOrInsertFunction("fib", Type::getInt32Ty(Context),
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44 Type::getInt32Ty(Context),
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45 (Type *)0));
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46
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47 // Add a basic block to the function.
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48 BasicBlock *BB = BasicBlock::Create(Context, "EntryBlock", FibF);
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49
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50 // Get pointers to the constants.
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51 Value *One = ConstantInt::get(Type::getInt32Ty(Context), 1);
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52 Value *Two = ConstantInt::get(Type::getInt32Ty(Context), 2);
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53
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54 // Get pointer to the integer argument of the add1 function...
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55 Argument *ArgX = FibF->arg_begin(); // Get the arg.
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56 ArgX->setName("AnArg"); // Give it a nice symbolic name for fun.
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57
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58 // Create the true_block.
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59 BasicBlock *RetBB = BasicBlock::Create(Context, "return", FibF);
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60 // Create an exit block.
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61 BasicBlock* RecurseBB = BasicBlock::Create(Context, "recurse", FibF);
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62
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63 // Create the "if (arg <= 2) goto exitbb"
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64 Value *CondInst = new ICmpInst(*BB, ICmpInst::ICMP_SLE, ArgX, Two, "cond");
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65 BranchInst::Create(RetBB, RecurseBB, CondInst, BB);
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66
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67 // Create: ret int 1
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68 ReturnInst::Create(Context, One, RetBB);
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69
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70 // create fib(x-1)
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71 Value *Sub = BinaryOperator::CreateSub(ArgX, One, "arg", RecurseBB);
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72 CallInst *CallFibX1 = CallInst::Create(FibF, Sub, "fibx1", RecurseBB);
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73 CallFibX1->setTailCall();
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74
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75 // create fib(x-2)
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76 Sub = BinaryOperator::CreateSub(ArgX, Two, "arg", RecurseBB);
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77 CallInst *CallFibX2 = CallInst::Create(FibF, Sub, "fibx2", RecurseBB);
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78 CallFibX2->setTailCall();
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79
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80
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81 // fib(x-1)+fib(x-2)
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82 Value *Sum = BinaryOperator::CreateAdd(CallFibX1, CallFibX2,
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83 "addresult", RecurseBB);
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84
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85 // Create the return instruction and add it to the basic block
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86 ReturnInst::Create(Context, Sum, RecurseBB);
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87
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88 return FibF;
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89 }
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90
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91
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92 int main(int argc, char **argv) {
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93 int n = argc > 1 ? atol(argv[1]) : 24;
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94
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95 InitializeNativeTarget();
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96 LLVMContext Context;
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97
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98 // Create some module to put our function into it.
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99 OwningPtr<Module> M(new Module("test", Context));
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100
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101 // We are about to create the "fib" function:
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102 Function *FibF = CreateFibFunction(M.get(), Context);
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103
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104 // Now we going to create JIT
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105 std::string errStr;
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106 ExecutionEngine *EE =
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107 EngineBuilder(M.get())
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108 .setErrorStr(&errStr)
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109 .setEngineKind(EngineKind::JIT)
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110 .create();
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111
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112 if (!EE) {
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113 errs() << argv[0] << ": Failed to construct ExecutionEngine: " << errStr
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114 << "\n";
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115 return 1;
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116 }
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117
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118 errs() << "verifying... ";
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119 if (verifyModule(*M)) {
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120 errs() << argv[0] << ": Error constructing function!\n";
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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121 return 1;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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122 }
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123
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124 errs() << "OK\n";
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125 errs() << "We just constructed this LLVM module:\n\n---------\n" << *M;
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126 errs() << "---------\nstarting fibonacci(" << n << ") with JIT...\n";
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127
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128 // Call the Fibonacci function with argument n:
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129 std::vector<GenericValue> Args(1);
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130 Args[0].IntVal = APInt(32, n);
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131 GenericValue GV = EE->runFunction(FibF, Args);
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132
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133 // import result of execution
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134 outs() << "Result: " << GV.IntVal << "\n";
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135
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136 return 0;
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137 }