LLVM字符串值对象：如何从值检索字符串？ [英] LLVM String Value objects: How can I retrieve the String from a Value?

问题描述

当从现有的AST构建IR时，我的AST有一些字符串值（在编译时，它们是从 std :: string 构建的）他们安全地作为 llvm :: Value 用作表达式的一部分。

When building the IR from an existing AST, my AST has some string values (at compile-time they are built from std::string) and I want to set them safely as llvm::Value to use as a part of an expression.

在这种情况下，我不需要在运行时绑定字符串，因为字符串值只是为了解析东西作为变量，函数或类在编译-time（该语言不支持本地字符串类型）。

In this case, I don't need to bind the string at run-time, because string values are only meant to resolve stuff as variables, functions or classes at compile-time (the language doesn't support a native string type).

将字符串内容保存为的最佳方式llvm :: Value

Whats the best way to keep my string content as llvm::Value and still be able to retrieve it at later stages of compilation (when the nesting expressions are built)?

 llvm::Value* v = llvm::ConstantArray::get(llvmContext, myString.c_str());

如何安全地检索字符串值？ $ llvm :: ConstantArray 是否适当的包装字符串的方法？

How do I safely retrieve the string value? Is llvm::ConstantArray the appropriate way to wrap strings?

推荐答案

是的，ConstantArray是你应该在这里使用。为了以后检索值，只需使用ConstantArray :: getAsCString（）。如果你打开了断言，它会断言是否出现错误（例如，你将尝试从数组w / o零终止符获取字符串）。

Yes, ConstantArray is what you should use here. In order to retrieve the value later just use ConstantArray::getAsCString(). If you have assertions turned on, it will assert if something will went wrong (e.g. you will try to grab string from the array w/o zero terminator).

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