从C程序调用LLVM Jit [英] Call LLVM Jit from c program

问题描述

我已经使用llvm.org上的在线编译器生成了一个bc文件，并且我想知道是否可以从ac或c ++程序加载该bc文件，并使用llvm jit在bc文件中执行IR (以编程方式在c程序中)，然后获取结果.

I have generated a bc file with the online compiler on llvm.org, and I would like to know if it is possible to load this bc file from a c or c++ program, execute the IR in the bc file with the llvm jit (programmatically in the c program), and get the results.

我该怎么做?

推荐答案

以下是基于Nathan Howell的一些工作代码:

Here's some working code based on Nathan Howell's:

#include <string>
#include <memory>
#include <iostream>

#include <llvm/LLVMContext.h>
#include <llvm/Target/TargetSelect.h>
#include <llvm/Bitcode/ReaderWriter.h>
#include <llvm/ExecutionEngine/ExecutionEngine.h>
#include <llvm/ModuleProvider.h>
#include <llvm/Support/MemoryBuffer.h>
#include <llvm/ExecutionEngine/JIT.h>

using namespace std;
using namespace llvm;

int main()
{
    InitializeNativeTarget();
    llvm_start_multithreaded();
    LLVMContext context;
    string error;
    Module *m = ParseBitcodeFile(MemoryBuffer::getFile("tst.bc"), context, &error);
    ExecutionEngine *ee = ExecutionEngine::create(m);

    Function* func = ee->FindFunctionNamed("main");

    typedef void (*PFN)();
    PFN pfn = reinterpret_cast<PFN>(ee->getPointerToFunction(func));
    pfn();
    delete ee;
}

一个奇怪的地方是，如果没有最后的包含，则ee为NULL.奇怪.

One oddity was that without the final include, ee is NULL. Bizarre.

要生成我的tst.bc，我使用了 http://llvm.org/demo/index.cgi 和llvm-as命令行工具.

To generate my tst.bc, I used http://llvm.org/demo/index.cgi and the llvm-as command-line tool.

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