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Diffstat (limited to 'contrib/llvm/examples/HowToUseJIT/HowToUseJIT.cpp')
-rw-r--r-- | contrib/llvm/examples/HowToUseJIT/HowToUseJIT.cpp | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/contrib/llvm/examples/HowToUseJIT/HowToUseJIT.cpp b/contrib/llvm/examples/HowToUseJIT/HowToUseJIT.cpp deleted file mode 100644 index 8e3b6dc..0000000 --- a/contrib/llvm/examples/HowToUseJIT/HowToUseJIT.cpp +++ /dev/null @@ -1,124 +0,0 @@ -//===-- 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; -} |