将模块写入.bc位码文件 [英] writing module to .bc bitcode file

问题描述

我假设从一个模块中转储一个.bc文件是一个简单的操作，但现在，
第一次我必须从代​​码中实际执行它，因为我的生命
可以'

  static void WriteModule（const Module * M，BitstreamWriter& Stream）
  

http://llvm.org/docs/doxygen/html/BitcodeWriter_8cpp.html#a828cec7a8fed9d232556420efef7ae89

编写该模块，首先我需要一个BistreamWriter

  BitstreamWriter :: BitstreamWriter（SmallVectorImpl< char>& O）
  code>  $ b   http://llvm.org/docs/doxygen/html/classllvm_1_1BitstreamWriter.html  
 
 
 
对于BitstreamWriter，我需要一个SmallVecto rImpl。但是，接下来呢？ 
我应该自己写一个
文件处理程序中的SmallVectorImpl字节的内容吗？有没有这样的llvm api？我还需要一些
吗？
 
解决方案   lib / Bitcode / Writer / BitcodeWriter.cpp 中是静态的，这意味着它不在外面消耗（甚至不能访问它）。
 $ b 
同一个文件有另外一个函数，但是叫做 WriteBitcodeToFile ，带有这个接口：
  /// WriteBitcodeToFile  - 将指定的模块写入指定的输出
 ///流。 
 void llvm :: WriteBitcodeToFile（const Module * M，raw_ostream& Out）; 
  
我无法想象一个更方便的界面。头文件声明它是 ./ include / llvm / Bitcode / ReaderWriter.h ，顺便说一下。
 
i've assumed that dumping a .bc file from a module was a trivial operation, but now,
first time i have to actually do it from code, for the life of me i
can't find one missing step in the process:
static void WriteModule ( const Module *  M, BitstreamWriter &  Stream )
http://llvm.org/docs/doxygen/html/BitcodeWriter_8cpp.html#a828cec7a8fed9d232556420efef7ae89

to write that module, first i need a BistreamWriter
BitstreamWriter::BitstreamWriter (SmallVectorImpl< char > &O)
http://llvm.org/docs/doxygen/html/classllvm_1_1BitstreamWriter.html

and for a BitstreamWriter i need a SmallVectorImpl. But, what next?
Should i write the content of the SmallVectorImpl byte by byte on a
file handler myself? is there a llvm api for this? do i need something
else?
解决方案
The WriteModule function is static within lib/Bitcode/Writer/BitcodeWriter.cpp, which means it's not there for outside consumption (you can't even access it).

The same file has another function, however, called WriteBitcodeToFile, with this interface:
/// WriteBitcodeToFile - Write the specified module to the specified output
/// stream.
void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out);
I can't imagine a more convenient interface. The header file declaring it is ./include/llvm/Bitcode/ReaderWriter.h, by the way.

                        
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