通过RunFunction传递时，函数指针的LLVM GenericValue变为0

Question

我试图将一个函数指针传递给LLVM解释器，但是当我在llvm函数中打印它时，它为null。我正在使用C API。

以下是相关代码（在D中）：

extern (C) void hello() {
    import core.stdc.stdio : printf;

    printf("Hello there!");
}

private void testFunctionPass() {
    auto printfType = LLVMFunctionType(LLVMInt32Type(),
            [LLVMPointerType(LLVMInt8Type(), 0)].ptr, 1, 1);
    auto llvmPrintf = LLVMAddFunction(moduleBuilder.module_, "printf", printfType);

    auto passedType = LLVMFunctionType(LLVMVoidType(), null, 0, 0);
    auto passedPtrType = LLVMPointerType(passedType, 0);
    auto testFunctionType = LLVMFunctionType(LLVMVoidType(), &passedPtrType, 1, 0);
    auto testFunction = LLVMAddFunction(moduleBuilder.module_, "fp_pass_test", testFunctionType);
    auto entryBlock = LLVMAppendBasicBlock(testFunction, "entry");
    auto builder = LLVMCreateBuilder();
    auto paramValue = LLVMGetParam(testFunction, 0);
    LLVMPositionBuilderAtEnd(builder, entryBlock);

    auto pointerPrintFormat = LLVMBuildGlobalStringPtr(builder, "received ptr: %x\n", "");
    LLVMBuildCall(builder, llvmPrintf, [pointerPrintFormat, paramValue].ptr, 2, "");

    LLVMBuildCall(builder, paramValue, null, 0, "");
    LLVMBuildRetVoid(builder);
    LLVMDisposeBuilder(builder);
    LLVMVerifyModule(moduleBuilder.module_, LLVMPrintMessageAction, null);
    LLVMDumpValue(testFunction);
    void* passedPtr = &hello;
    LLVMGenericValueRef passedPtrGeneric = LLVMCreateGenericValueOfPointer(passedPtr);
    auto unwrapped = LLVMGenericValueToPointer(passedPtrGeneric);
    import core.stdc.stdio : printf;

    printf("passed ptr: %x\n", passedPtr);
    printf("unwrapped ptr: %x\n", unwrapped);

    LLVMRunFunction(interpreter, testFunction, 1, &passedPtrGeneric);
}

这是输出：

define void @fp_pass_test(void ()*) {
entry:
  %1 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @0, i32 0, i32 0), void ()* %0)
  call void %0()
  ret void
}
passed ptr: 4142ddb0
unwrapped ptr: 4142ddb0
received ptr: 0
Program exited with code -11

有人知道为什么指针通过LLVMRunFunction传递后会变为空吗？