llvm dev - Oct 2012 - [LLVMdev] Reading IR from a std::ostream

Previously I had asked how to write then read back IR to/from a file.  The write
code looked like:

    LLVMContext ctx;
    SMDiagnostic diag;
    Module *m = ParseIRFile( "my_file", diag, ctx );

However, the code I'm trying to retrofit LLVM IR into passes me just a
std::ostream&.  How can I read IR from a std::ostream?

I figured out how to use raw_os_ostream to adapt a std::ostream to a raw_ostream
for writing a module, but there's no obvious way to adapt the code for
reading, e.g., no MemoryBuffer that adapts a std::ostream (unless I missed it).

- Paul

Sorry for the (almost) repeat question, but I realized that, in my original
question, I mistyped "ostream" when I meant "istream".

Previously I had asked how to write then read back IR to/from a file.  The write
code looked like:

   LLVMContext ctx;
   SMDiagnostic diag;
   Module *m = ParseIRFile( "my_file", diag, ctx );

However, the code I'm trying to retrofit LLVM IR into passes me just a
std::istream&.  How can I read IR from a std::istream?

I figured out how to use raw_os_ostream to adapt a std::ostream to a raw_ostream
for writing a module, but there's no obvious way to adapt the code for
reading, e.g., no MemoryBuffer that adapts a std::istream (unless I missed it).

- Paul

You may be able to get by just reading everything from the stream into a buffer.

-- Sean Silva

On Sun, Oct 21, 2012 at 10:30 PM, Paul J. Lucas <paul at lucasmail.org>
wrote:
> Previously I had asked how to write then read back IR to/from a file.  The
write code looked like:
>
>     LLVMContext ctx;
>     SMDiagnostic diag;
>     Module *m = ParseIRFile( "my_file", diag, ctx );
>
> However, the code I'm trying to retrofit LLVM IR into passes me just a
std::ostream&.  How can I read IR from a std::ostream?
>
> I figured out how to use raw_os_ostream to adapt a std::ostream to a
raw_ostream for writing a module, but there's no obvious way to adapt the
code for reading, e.g., no MemoryBuffer that adapts a std::ostream (unless I
missed it).
>
> - Paul
>
>
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