- // Create the add instruction... does not insert...
- Instruction *Add = BinaryOperator::create(Instruction::Add, One, &ArgX,
- "addresult");
-
- // explicitly insert it into the basic block...
- BB->getInstList().push_back(Add);
-
- // Create the return instruction and add it to the basic block
- BB->getInstList().push_back(new ReturnInst(Add));
-
- // function add1 is ready
- }
-
-
- // now we going to create function `foo':
- Function *FooF;
-
- {
- // Create the foo function type:
- FunctionType *FooT =
- FunctionType::get(Type::IntTy, // result has type: 'int ()'
- std::vector<const Type*>(), // no arguments
- /*not vararg*/false);
-
- // create the entry for function `foo' and insert
- // this entry into module M:
- FooF =
- new Function(FooT,
- Function::ExternalLinkage, // too wide?
- "foo", M);
-
- // Add a basic block to the FooF function...
- BasicBlock *BB = new BasicBlock("EntryBlock of add1 function", FooF);
-
- // Get pointers to the constant `10'...
- Value *Ten = ConstantSInt::get(Type::IntTy, 10);
-
- // Put the argument Ten on stack and make 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
- BB->getInstList().push_back(new ReturnInst(Add1CallRes));
-
- }
-
- // Now we going to create JIT ??
- ExistingModuleProvider* MP = new ExistingModuleProvider(M);
- ExecutionEngine* EE = ExecutionEngine::create( MP, true );
+
+ // 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();