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-//===-- examples/HowToUseJIT/HowToUseJIT.cpp - An example use of the JIT --===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This small program provides an example of how to quickly build a small
-// module with two functions and execute it with the JIT.
-//
-// Goal:
-// The goal of this snippet is to create in the memory
-// the LLVM module consisting of two functions as follow:
-//
-// int add1(int x) {
-// return x+1;
-// }
-//
-// int foo() {
-// return add1(10);
-// }
-//
-// then compile the module via JIT, then execute the `foo'
-// function and return result to a driver, i.e. to a "host program".
-//
-// Some remarks and questions:
-//
-// - could we invoke some code using noname functions too?
-// e.g. evaluate "foo()+foo()" without fears to introduce
-// conflict of temporary function name with some real
-// existing function name?
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Instructions.h"
-#include "llvm/ExecutionEngine/JIT.h"
-#include "llvm/ExecutionEngine/Interpreter.h"
-#include "llvm/ExecutionEngine/GenericValue.h"
-#include "llvm/Target/TargetSelect.h"
-#include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/raw_ostream.h"
-using namespace llvm;
-
-int main() {
-
- InitializeNativeTarget();
-
- LLVMContext Context;
-
- // Create some module to put our function into it.
- Module *M = new Module("test", Context);
-
- // Create the add1 function entry and insert this entry into module M. The
- // function will have a return type of "int" and take an argument of "int".
- // The '0' terminates the list of argument types.
- Function *Add1F =
- cast<Function>(M->getOrInsertFunction("add1", Type::getInt32Ty(Context),
- Type::getInt32Ty(Context),
- (Type *)0));
-
- // Add a basic block to the function. As before, it automatically inserts
- // because of the last argument.
- BasicBlock *BB = BasicBlock::Create(Context, "EntryBlock", Add1F);
-
- // Get pointers to the constant `1'.
- Value *One = ConstantInt::get(Type::getInt32Ty(Context), 1);
-
- // Get pointers to the integer argument of the add1 function...
- assert(Add1F->arg_begin() != Add1F->arg_end()); // Make sure there's an arg
- Argument *ArgX = Add1F->arg_begin(); // Get the arg
- ArgX->setName("AnArg"); // Give it a nice symbolic name for fun.
-
- // Create the add instruction, inserting it into the end of BB.
- Instruction *Add = BinaryOperator::CreateAdd(One, ArgX, "addresult", BB);
-
- // Create the return instruction and add it to the basic block
- ReturnInst::Create(Context, Add, BB);
-
- // Now, function add1 is ready.
-
-
- // Now we going to create function `foo', which returns an int and takes no
- // arguments.
- Function *FooF =
- cast<Function>(M->getOrInsertFunction("foo", Type::getInt32Ty(Context),
- (Type *)0));
-
- // Add a basic block to the FooF function.
- BB = BasicBlock::Create(Context, "EntryBlock", FooF);
-
- // Get pointers to the constant `10'.
- Value *Ten = ConstantInt::get(Type::getInt32Ty(Context), 10);
-
- // Pass Ten to the call call:
- CallInst *Add1CallRes = CallInst::Create(Add1F, Ten, "add1", BB);
- Add1CallRes->setTailCall(true);
-
- // Create the return instruction and add it to the basic block.
- ReturnInst::Create(Context, Add1CallRes, BB);
-
- // Now we create the JIT.
- ExecutionEngine* EE = EngineBuilder(M).create();
-
- outs() << "We just constructed this LLVM module:\n\n" << *M;
- outs() << "\n\nRunning foo: ";
- outs().flush();
-
- // Call the `foo' function with no arguments:
- std::vector<GenericValue> noargs;
- GenericValue gv = EE->runFunction(FooF, noargs);
-
- // Import result of execution:
- outs() << "Result: " << gv.IntVal << "\n";
- EE->freeMachineCodeForFunction(FooF);
- delete EE;
- llvm_shutdown();
- return 0;
-}