小编Ger*_*cia的帖子

我需要实现一个库,它使用LLVM/Clang作为后端将C代码编译为eBPF字节码.代码将从内存中读取,我需要将结果汇编代码也存储在内存中.

到目前为止,我已经能够使用以下代码编译为LLVM IR:

#include <string>
#include <vector>

#include <clang/Frontend/CompilerInstance.h>
#include <clang/Basic/DiagnosticOptions.h>
#include <clang/Frontend/TextDiagnosticPrinter.h>
#include <clang/CodeGen/CodeGenAction.h>
#include <clang/Basic/TargetInfo.h>
#include <llvm/Support/TargetSelect.h>

using namespace std;
using namespace clang;
using namespace llvm;

int main() {

    constexpr auto testCodeFileName = "test.cpp";
    constexpr auto testCode = "int test() { return 2+2; }";

    // Prepare compilation arguments
    vector<const char *> args;
    args.push_back(testCodeFileName);

    // Prepare DiagnosticEngine 
    DiagnosticOptions DiagOpts;
    TextDiagnosticPrinter *textDiagPrinter =
            new clang::TextDiagnosticPrinter(errs(),
                                         &DiagOpts);
    IntrusiveRefCntPtr<clang::DiagnosticIDs> pDiagIDs;
    DiagnosticsEngine *pDiagnosticsEngine =
            new DiagnosticsEngine(pDiagIDs,
                                         &DiagOpts,
                                         textDiagPrinter);

    // Initialize CompilerInvocation
    CompilerInvocation *CI …