Check in LLVM r95781.
diff --git a/examples/HowToUseJIT/HowToUseJIT.cpp b/examples/HowToUseJIT/HowToUseJIT.cpp
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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;
+}