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LLVM [2.6] JIT Tutorial 1 (OS X, 2015)
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// A modified version of the "LLVM JIT Tutorial 1" code from http://goo.gl/1cNfH7 | |
// which actually works with the latest versions of LLVM as of Feb 2015. | |
// | |
// To compile if you're on OS X using 'llvm' [libs, etc.] from Homebrew: | |
// clang++ -g test.cpp `/usr/local/opt/llvm/bin/llvm-config --cxxflags --ldflags --libs core --system-libs` -I/usr/local/opt/llvm/include -o test | |
#include "llvm/IR/Module.h" | |
#include "llvm/IR/Function.h" | |
#include "llvm/PassManager.h" | |
#include "llvm/IR/CallingConv.h" | |
#include "llvm/IR/Verifier.h" | |
#include "llvm/IR/IRPrintingPasses.h" | |
#include "llvm/IR/IRBuilder.h" | |
#include "llvm/Support/raw_ostream.h" | |
using namespace llvm; | |
Module* makeLLVMModule() { | |
LLVMContext &context = getGlobalContext(); | |
// Module Construction | |
Module* mod = new Module("test", context); | |
Constant* c = mod->getOrInsertFunction("mul_add", | |
/*ret type*/ IntegerType::get(context, 32), | |
/*args*/ IntegerType::get(context, 32), | |
IntegerType::get(context, 32), | |
IntegerType::get(context, 32), | |
/*varargs terminated with null*/ NULL); | |
Function* mul_add = cast<Function>(c); | |
mul_add->setCallingConv(CallingConv::C); | |
Function::arg_iterator args = mul_add->arg_begin(); | |
Value* x = args++; | |
x->setName("x"); | |
Value* y = args++; | |
y->setName("y"); | |
Value* z = args++; | |
z->setName("z"); | |
BasicBlock* block = BasicBlock::Create(context, "entry", mul_add); | |
IRBuilder<> builder(block); | |
Value* tmp = builder.CreateBinOp(Instruction::Mul, x, y, "tmp"); | |
Value* tmp2 = builder.CreateBinOp(Instruction::Add, tmp, z, "tmp2"); | |
builder.CreateRet(tmp2); | |
return mod; | |
} | |
int main(int argc, char**argv) { | |
Module* Mod = makeLLVMModule(); | |
verifyModule(*Mod, &outs()); | |
PassManager PM; | |
PM.add(createPrintModulePass(outs())); | |
PM.run(*Mod); | |
delete Mod; | |
return 0; | |
} |
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