[llvm] r357724 - Make SourceManager::createFileID(UnownedTag, ...) take a const llvm::MemoryBuffer*

[Nico Weber via llvm-commits]

Author: nico
Date: Thu Apr  4 14:06:41 2019
New Revision: 357724

URL: http://llvm.org/viewvc/llvm-project?rev=357724&view=rev
Log:
Make SourceManager::createFileID(UnownedTag, ...) take a const llvm::MemoryBuffer*

Requires making the llvm::MemoryBuffer* stored by SourceManager const,
which in turn requires making the accessors for that return const
llvm::MemoryBuffer*s and updating all call sites.

The original motivation for this was to use it and fix the TODO in
CodeGenAction.cpp's ConvertBackendLocation() by using the UnownedTag
version of createFileID, and since llvm::SourceMgr* hands out a const
llvm::MemoryBuffer* this is required. I'm not sure if fixing the TODO
this way actually works, but this seems like a good change on its own
anyways.

No intended behavior change.

Differential Revision: https://reviews.llvm.org/D60247

Modified:
    llvm/trunk/include/llvm/Support/MemoryBuffer.h

Modified: llvm/trunk/include/llvm/Support/MemoryBuffer.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/MemoryBuffer.h?rev=357724&r1=357723&r2=357724&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Support/MemoryBuffer.h (original)
+++ llvm/trunk/include/llvm/Support/MemoryBuffer.h Thu Apr  4 14:06:41 2019
@@ -264,7 +264,7 @@ class MemoryBufferRef {
 
 public:
   MemoryBufferRef() = default;
-  MemoryBufferRef(MemoryBuffer& Buffer)
+  MemoryBufferRef(const MemoryBuffer& Buffer)
       : Buffer(Buffer.getBuffer()), Identifier(Buffer.getBufferIdentifier()) {}
   MemoryBufferRef(StringRef Buffer, StringRef Identifier)
       : Buffer(Buffer), Identifier(Identifier) {}