- // We are about to create the add1 function:
- Function *Add1F;
-
- {
- // first create type for the single argument of add1 function:
- // the type is 'int ()'
- std::vector<const Type*> ArgT(1);
- ArgT[0] = Type::IntTy;
-
- // now create full type of the add1 function:
- FunctionType *Add1T = FunctionType::get(Type::IntTy, // type of result
- ArgT,
- /*not vararg*/false);
-
- // Now create the add1 function entry and
- // insert this entry into module M
- // (By passing a module as the last parameter to the Function constructor,
- // it automatically gets appended to the Module.)
- Add1F = new Function(Add1T,
- Function::ExternalLinkage, // maybe too much
- "add1", M);
-
- // Add a basic block to the function... (again, it automatically inserts
- // because of the last argument.)
- BasicBlock *BB = new BasicBlock("EntryBlock of add1 function", Add1F);
-
- // Get pointers to the constant `1'...
- Value *One = ConstantSInt::get(Type::IntTy, 1);
-
- // Get pointers to the integer argument of the add1 function...
- assert(Add1F->abegin() != Add1F->aend()); // Make sure there's an arg
- Argument &ArgX = Add1F->afront(); // Get the arg
-
- // 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 ??
+ // Now we going to create function `foo', which returns an int and takes no
+ // arguments.
+ Function *FooF =
+ cast<Function>(M->getOrInsertFunction("foo", Type::Int32Ty, (Type *)0));
+
+ // Add a basic block to the FooF function.
+ BB = BasicBlock::Create("EntryBlock", FooF);
+
+ // Get pointers to the constant `10'.
+ Value *Ten = ConstantInt::get(Type::Int32Ty, 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(Add1CallRes, BB);
+
+ // Now we create the JIT.