从uint8_t *转换为StringRef

Question

我使用的是ExecutionEngine.cpp。我想通过以下代码从找到的地址中获取StringRef：

const APInt &IntVal;

uint8_t *y2 = reinterpret_cast<uint8_t *>(const_cast<uint64_t *>(IntVal.getRawData()));

int v2 = *reinterpret_cast<int *>(y2);

StringRef* Src1V=cast<StringRef>(y2);

我收到了这个错误：

home/rasha/llvm/llvm/include/llvm/Support/Casting.h:236:3: required from ‘typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X = llvm::StringRef; Y = unsigned char; typename llvm::cast_retty<X, Y*>::ret_type = llvm::StringRef*]’

/home/rasha/llvm/llvm/lib/ExecutionEngine/Interpreter/Execution.cpp:1291:38: required from here

/home/rasha/llvm/llvm/include/llvm/Support/Casting.h:56:28: error: ‘classof’ is not a member of ‘llvm::StringRef’

return To::classof(&Val);

请您向我解释错误吗？ 请注意，我在Execution.cpp中使用了相同类型的转换，没有错误。

Answer 1

字符串在LLVM IR中都表示为library(lubridate) ymd(as.character(Sys.Date())) ，是Constant的子类。如果你想要stringref，你必须通过调用myVector<-c("a string", Sys.Date()) as.Date(as.numeric(myVector[2]),origin="1970-01-01") 的相应API明确告诉LLVM为你做这件事 具体而言，您需要在转换指针后调用以下一个或多个LLVM API：

• ConstantDataSequential
• ConstantDataSequential
• isString (unsigned CharSize=8)
• isCString ()