[cfe-dev] Executing a FrontendAction on a MemoryBuffer

[Mike Miller]

Some folks on #llvm helped me with this - the solution is to create a
virtual file using FileManager::getVirtualFile, and populate it with the
buffer's contents using SourceManager::overrideFileContents, then pass the
virtual file to the FrontendAction.

Hope that helps,
Mike

On Fri, May 7, 2010 at 5:40 PM, Mike Miller <michael.g.miller at gmail.com>wrote:

> Hi,
>
> I'm currently using the following code(excerpted) to execute a
> FrontendAction(an EmitObjAction specifically) on source code contained in a
> MemoryBuffer:
>
> llvm::MemoryBuffer* Buffer = llvm::MemoryBuffer::getMemBuffer(Source);
> SourceManager& SM = Clang.getSourceManager();
> FileID MainFileID = SM.createMainFileIDForMemBuffer(Buffer);
>
> EmitObjAction E;
> E.setCompilerInstance(&Clang);
> E.Execute();
>
> The code fails at "E.Execute()" with:
>
> Assertion failed: (!CurrentFile.empty() && "No current file!"), function
> isCurrentFileAST, file
> /Volumes/Data/Users/mike/llvm/tools/clang/lib/Frontend/../../include/clang/Frontend/FrontendAction.h,
> line 95.
>
>
> I looked up the FrontendAction::setCurrentFile method, but it takes in a
> StringRef to a path. Since I don't have a path to a file, as I'm only
> operating on source code in memory, I'm not able to set the current file.
>
> How can I set the current file to point to a MemoryBuffer?
>
> Thanks!
> Mike
>
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