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annotate examples/HowToUseJIT/HowToUseJIT.cpp @ 68:a37375f10d66

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author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Wed, 12 Feb 2014 01:06:33 +0900
parents 95c75e76d11b
children 54457678186b
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1 //===-- examples/HowToUseJIT/HowToUseJIT.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 quickly build a small
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11 // module with two functions and execute it with the JIT.
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12 //
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13 // Goal:
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14 // The goal of this snippet is to create in the memory
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15 // the LLVM module consisting of two functions as follow:
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16 //
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17 // int add1(int x) {
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18 // return x+1;
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19 // }
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20 //
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21 // int foo() {
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22 // return add1(10);
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23 // }
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24 //
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25 // then compile the module via JIT, then execute the `foo'
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26 // function and return result to a driver, i.e. to a "host program".
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27 //
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28 // Some remarks and questions:
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29 //
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30 // - could we invoke some code using noname functions too?
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31 // e.g. evaluate "foo()+foo()" without fears to introduce
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32 // conflict of temporary function name with some real
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33 // existing function name?
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34 //
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35 //===----------------------------------------------------------------------===//
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36
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37 #include "llvm/ExecutionEngine/GenericValue.h"
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38 #include "llvm/ExecutionEngine/Interpreter.h"
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39 #include "llvm/ExecutionEngine/JIT.h"
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40 #include "llvm/IR/Constants.h"
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41 #include "llvm/IR/DerivedTypes.h"
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42 #include "llvm/IR/IRBuilder.h"
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43 #include "llvm/IR/Instructions.h"
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44 #include "llvm/IR/LLVMContext.h"
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45 #include "llvm/IR/Module.h"
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46 #include "llvm/Support/ManagedStatic.h"
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47 #include "llvm/Support/TargetSelect.h"
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48 #include "llvm/Support/raw_ostream.h"
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49
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50 using namespace llvm;
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51
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52 int main() {
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53
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54 InitializeNativeTarget();
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55
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56 LLVMContext Context;
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57
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58 // Create some module to put our function into it.
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59 Module *M = new Module("test", Context);
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60
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61 // Create the add1 function entry and insert this entry into module M. The
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62 // function will have a return type of "int" and take an argument of "int".
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63 // The '0' terminates the list of argument types.
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64 Function *Add1F =
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65 cast<Function>(M->getOrInsertFunction("add1", Type::getInt32Ty(Context),
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66 Type::getInt32Ty(Context),
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67 (Type *)0));
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68
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69 // Add a basic block to the function. As before, it automatically inserts
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70 // because of the last argument.
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71 BasicBlock *BB = BasicBlock::Create(Context, "EntryBlock", Add1F);
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72
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73 // Create a basic block builder with default parameters. The builder will
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74 // automatically append instructions to the basic block `BB'.
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75 IRBuilder<> builder(BB);
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76
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77 // Get pointers to the constant `1'.
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78 Value *One = builder.getInt32(1);
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79
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80 // Get pointers to the integer argument of the add1 function...
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81 assert(Add1F->arg_begin() != Add1F->arg_end()); // Make sure there's an arg
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82 Argument *ArgX = Add1F->arg_begin(); // Get the arg
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83 ArgX->setName("AnArg"); // Give it a nice symbolic name for fun.
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84
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85 // Create the add instruction, inserting it into the end of BB.
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86 Value *Add = builder.CreateAdd(One, ArgX);
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87
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88 // Create the return instruction and add it to the basic block
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89 builder.CreateRet(Add);
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90
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91 // Now, function add1 is ready.
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92
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93
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94 // Now we're going to create function `foo', which returns an int and takes no
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95 // arguments.
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96 Function *FooF =
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97 cast<Function>(M->getOrInsertFunction("foo", Type::getInt32Ty(Context),
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98 (Type *)0));
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99
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100 // Add a basic block to the FooF function.
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101 BB = BasicBlock::Create(Context, "EntryBlock", FooF);
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102
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103 // Tell the basic block builder to attach itself to the new basic block
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104 builder.SetInsertPoint(BB);
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105
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106 // Get pointer to the constant `10'.
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107 Value *Ten = builder.getInt32(10);
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108
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109 // Pass Ten to the call to Add1F
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110 CallInst *Add1CallRes = builder.CreateCall(Add1F, Ten);
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111 Add1CallRes->setTailCall(true);
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112
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113 // Create the return instruction and add it to the basic block.
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114 builder.CreateRet(Add1CallRes);
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115
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116 // Now we create the JIT.
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117 ExecutionEngine* EE = EngineBuilder(M).create();
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118
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119 outs() << "We just constructed this LLVM module:\n\n" << *M;
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120 outs() << "\n\nRunning foo: ";
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121 outs().flush();
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122
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123 // Call the `foo' function with no arguments:
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124 std::vector<GenericValue> noargs;
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125 GenericValue gv = EE->runFunction(FooF, noargs);
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126
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127 // Import result of execution:
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128 outs() << "Result: " << gv.IntVal << "\n";
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129 EE->freeMachineCodeForFunction(FooF);
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130 delete EE;
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131 llvm_shutdown();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 return 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133 }