Check in LLVM r95781.
diff --git a/examples/Fibonacci/fibonacci.cpp b/examples/Fibonacci/fibonacci.cpp
new file mode 100644
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--- /dev/null
+++ b/examples/Fibonacci/fibonacci.cpp
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+//===--- examples/Fibonacci/fibonacci.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 build quickly a small module
+// with function Fibonacci and execute it with the JIT.
+//
+// The goal of this snippet is to create in the memory the LLVM module
+// consisting of one function as follow:
+//
+// int fib(int x) {
+// if(x<=2) return 1;
+// return fib(x-1)+fib(x-2);
+// }
+//
+// Once we have this, we compile the module via JIT, then execute the `fib'
+// function and return result to a driver, i.e. to a "host program".
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Constants.h"
+#include "llvm/Instructions.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/ExecutionEngine/JIT.h"
+#include "llvm/ExecutionEngine/Interpreter.h"
+#include "llvm/ExecutionEngine/GenericValue.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetSelect.h"
+using namespace llvm;
+
+static Function *CreateFibFunction(Module *M, LLVMContext &Context) {
+ // Create the fib function and insert it into module M. This function is said
+ // to return an int and take an int parameter.
+ Function *FibF =
+ cast<Function>(M->getOrInsertFunction("fib", Type::getInt32Ty(Context),
+ Type::getInt32Ty(Context),
+ (Type *)0));
+
+ // Add a basic block to the function.
+ BasicBlock *BB = BasicBlock::Create(Context, "EntryBlock", FibF);
+
+ // Get pointers to the constants.
+ Value *One = ConstantInt::get(Type::getInt32Ty(Context), 1);
+ Value *Two = ConstantInt::get(Type::getInt32Ty(Context), 2);
+
+ // Get pointer to the integer argument of the add1 function...
+ Argument *ArgX = FibF->arg_begin(); // Get the arg.
+ ArgX->setName("AnArg"); // Give it a nice symbolic name for fun.
+
+ // Create the true_block.
+ BasicBlock *RetBB = BasicBlock::Create(Context, "return", FibF);
+ // Create an exit block.
+ BasicBlock* RecurseBB = BasicBlock::Create(Context, "recurse", FibF);
+
+ // Create the "if (arg <= 2) goto exitbb"
+ Value *CondInst = new ICmpInst(*BB, ICmpInst::ICMP_SLE, ArgX, Two, "cond");
+ BranchInst::Create(RetBB, RecurseBB, CondInst, BB);
+
+ // Create: ret int 1
+ ReturnInst::Create(Context, One, RetBB);
+
+ // create fib(x-1)
+ Value *Sub = BinaryOperator::CreateSub(ArgX, One, "arg", RecurseBB);
+ CallInst *CallFibX1 = CallInst::Create(FibF, Sub, "fibx1", RecurseBB);
+ CallFibX1->setTailCall();
+
+ // create fib(x-2)
+ Sub = BinaryOperator::CreateSub(ArgX, Two, "arg", RecurseBB);
+ CallInst *CallFibX2 = CallInst::Create(FibF, Sub, "fibx2", RecurseBB);
+ CallFibX2->setTailCall();
+
+
+ // fib(x-1)+fib(x-2)
+ Value *Sum = BinaryOperator::CreateAdd(CallFibX1, CallFibX2,
+ "addresult", RecurseBB);
+
+ // Create the return instruction and add it to the basic block
+ ReturnInst::Create(Context, Sum, RecurseBB);
+
+ return FibF;
+}
+
+
+int main(int argc, char **argv) {
+ int n = argc > 1 ? atol(argv[1]) : 24;
+
+ InitializeNativeTarget();
+ LLVMContext Context;
+
+ // Create some module to put our function into it.
+ Module *M = new Module("test", Context);
+
+ // We are about to create the "fib" function:
+ Function *FibF = CreateFibFunction(M, Context);
+
+ // Now we going to create JIT
+ std::string errStr;
+ ExecutionEngine *EE = EngineBuilder(M).setErrorStr(&errStr).setEngineKind(EngineKind::JIT).create();
+
+ if (!EE) {
+ errs() << argv[0] << ": Failed to construct ExecutionEngine: " << errStr << "\n";
+ return 1;
+ }
+
+ errs() << "verifying... ";
+ if (verifyModule(*M)) {
+ errs() << argv[0] << ": Error constructing function!\n";
+ return 1;
+ }
+
+ errs() << "OK\n";
+ errs() << "We just constructed this LLVM module:\n\n---------\n" << *M;
+ errs() << "---------\nstarting fibonacci(" << n << ") with JIT...\n";
+
+ // Call the Fibonacci function with argument n:
+ std::vector<GenericValue> Args(1);
+ Args[0].IntVal = APInt(32, n);
+ GenericValue GV = EE->runFunction(FibF, Args);
+
+ // import result of execution
+ outs() << "Result: " << GV.IntVal << "\n";
+ return 0;
+}