如何将IR保存到文件并将其构建为可执行文件？ [英] How to save IR to a file and build it to an executable file?

问题描述

现在我使用clang将.c文件构建为.s文件。而且我已经用llvm API修改了IR。但是，现在我无法将修改后的IR保存到文件中。我想使用 LLVMWriteBitcodeToFile，但是找不到 LLVMOpaqueModule的结构；我想使用 WriteBitcodeToFile，它总是显示类型不匹配。而且我还想知道如何将IR文件构建为可执行文件。

Now I use clang build my .c file to .s file. And I have used the llvm API modify the IR. However, now I can't save my modified IR to a file. I want to use "LLVMWriteBitcodeToFile", but I can't find the struct of "LLVMOpaqueModule"; I want to use "WriteBitcodeToFile", it always show me "type mismatch". And I also want to know how to build an IR file to a executable file.

接下来是保存模块的两种方法：

Next are two methods I use to save a module:

1，首先使用WriteBitcodeToFile

1、First use WriteBitcodeToFile

bool unbuffered = false; 
llvm::raw_ostream ro(unbuffered); 
WriteBitcodeToFile(m, ro); 

2，第二次使用LLVMWriteBitcodeToFile

2、Second use LLVMWriteBitcodeToFile

const char *Path = "hello2.s"; 
int ans = LLVMWriteBitcodeToFile(m, Path); 

注意：m是模块实例的一个点

note: m is a point of Module instance

推荐答案

1. 要将IR保存到文件中，请参见以下问题的答案：将模块写入.bc位代码文件


2. 要将IR编译为目标文件，请查看 llc 工具，并遵循其 main 函数的作用。

1. For saving the IR into a file, see the answer to this question: writing module to .bc bitcode file
2. For compiling IR to an object file, look at the llc tool and follow what its main function does.

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