//===-- examples/HowToUseJIT/HowToUseJIT.cpp - An example use of the JIT --===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Valery A. Khamenya and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// 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:
+// 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:
+// 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'
+//
+// 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
+// e.g. evaluate "foo()+foo()" without fears to introduce
// conflict of temporary function name with some real
// existing function name?
-//
+//
//===----------------------------------------------------------------------===//
-#include "llvm/Module.h"
-#include "llvm/Constants.h"
-#include "llvm/Type.h"
-#include "llvm/Instructions.h"
-#include "llvm/ModuleProvider.h"
-#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ADT/STLExtras.h"
#include "llvm/ExecutionEngine/GenericValue.h"
-#include <iostream>
+#include "llvm/ExecutionEngine/Interpreter.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/TargetSelect.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");
+ std::unique_ptr<Module> Owner = make_unique<Module>("test", Context);
+ Module *M = Owner.get();
// 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 = M->getOrInsertFunction("add1", Type::IntTy, Type::IntTy, 0);
+ Function *Add1F =
+ cast<Function>(M->getOrInsertFunction("add1", Type::getInt32Ty(Context),
+ Type::getInt32Ty(Context),
+ nullptr));
// Add a basic block to the function. As before, it automatically inserts
// because of the last argument.
- BasicBlock *BB = new BasicBlock("EntryBlock", Add1F);
-
+ BasicBlock *BB = BasicBlock::Create(Context, "EntryBlock", Add1F);
+
+ // Create a basic block builder with default parameters. The builder will
+ // automatically append instructions to the basic block `BB'.
+ IRBuilder<> builder(BB);
+
// Get pointers to the constant `1'.
- Value *One = ConstantSInt::get(Type::IntTy, 1);
+ Value *One = builder.getInt32(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
+ 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);
-
+ Value *Add = builder.CreateAdd(One, ArgX);
+
// Create the return instruction and add it to the basic block
- new ReturnInst(Add, BB);
+ builder.CreateRet(Add);
// Now, function add1 is ready.
-
- // Now we going to create function `foo', which returns an int and takes no
+ // Now we're going to create function `foo', which returns an int and takes no
// arguments.
- Function *FooF = M->getOrInsertFunction("foo", Type::IntTy, 0);
+ Function *FooF =
+ cast<Function>(M->getOrInsertFunction("foo", Type::getInt32Ty(Context),
+ nullptr));
// Add a basic block to the FooF function.
- BB = new BasicBlock("EntryBlock", FooF);
+ BB = BasicBlock::Create(Context, "EntryBlock", FooF);
+
+ // Tell the basic block builder to attach itself to the new basic block
+ builder.SetInsertPoint(BB);
+
+ // Get pointer to the constant `10'.
+ Value *Ten = builder.getInt32(10);
- // Get pointers to the constant `10'.
- Value *Ten = ConstantSInt::get(Type::IntTy, 10);
+ // Pass Ten to the call to Add1F
+ CallInst *Add1CallRes = builder.CreateCall(Add1F, Ten);
+ Add1CallRes->setTailCall(true);
- // Pass Ten to the call call:
- std::vector<Value*> Params;
- Params.push_back(Ten);
- CallInst * Add1CallRes = new CallInst(Add1F, Params, "add1", BB);
-
// Create the return instruction and add it to the basic block.
- new ReturnInst(Add1CallRes, BB);
+ builder.CreateRet(Add1CallRes);
// Now we create the JIT.
- ExistingModuleProvider* MP = new ExistingModuleProvider(M);
- ExecutionEngine* EE = ExecutionEngine::create(MP, false);
+ ExecutionEngine* EE = EngineBuilder(std::move(Owner)).create();
- std::cout << "We just constructed this LLVM module:\n\n" << *M;
- std::cout << "\n\nRunning foo: " << std::flush;
+ 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:
- std::cout << "Result: " << gv.IntVal << "\n";
+ outs() << "Result: " << gv.IntVal << "\n";
+ delete EE;
+ llvm_shutdown();
return 0;
}
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