How to get the textual representation of an LLVM IR instruction?

Question

If I is of type llvm::Instruction, we can print out the same in human-readable form (textual representation) by errs() << I;

I want the assign the exact same representation to a std::string to C type string. How can I do that?

Answer 1

嗯，LLVM也提供了一个字符串流：

#include <llvm/Support/raw_ostream.h>

像这样使用：

std::string str;
llvm::raw_string_ostream(str) << I;

// use str

Answer 2

我在使用@ eush77的答案时遇到了一些问题。这是我的解决方法。

std::string str;
llvm::raw_string_ostream ss(str);
ss << I;
errs() << ss.str() << "\n";