From be8497804f803c02cfab1aa2c54d921042e90ec9 Mon Sep 17 00:00:00 2001
From: jsmall-nvidia <jsmall@nvidia.com>
Date: Thu, 1 Sep 2022 15:38:17 -0400
Subject: Remove artifact from SourceFile (#2384)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Make DownstreamCompileOptions use POD types.

* CharSliceAllocator -> SliceAllocator
Added SliceConverter
CharSliceCaster -> SliceCaster

* First attempt at zero terminating around blobs.

* Fix clang warning.

* Add SlangTerminatedChars
Make Blob implementations support it.
Make most blobs 'terminated'.

* Fix bug setting up sourceFiles for CommandLineDownstreamCompiler.

* Traffic in TerminatedCharSlice for sourceFiles.
Use ArtifactDesc to generate temporary file names for source.

* Fix typo in testing for shared library/C++.

* Working with source being passed as artifacts to DownstreamCompiler.

* Use artifacts in SourceManager/SourceFile.

* Support infering extension from the original file extension.

* * Infer extension if can't determine from the artifact type
* Split IOSFile/IExtFile representations
* Move responsibility for creating OS file to the handler.

* Disable the check memory path.

* Remove artifact from SourceFile.
Lazily generate SourceFile from artifacts as needed.

* Fix some small bugs.

* Remove maybeAddArtifact.

* Load artifacts if repro capture is enabled.

* Remove adding by string, because doing so means source will be allocated twice or there is a potential race around ref counting to the contained String.

* Add built in source as a blob.

* Fix warning.

* Make StringBlob own the contents if moved.
Fix some compilation issues.

* Share StringBlob uniqueness code.

* Do move unique on Ctor.

* Change MoveUnique to not have any values.

* MoveUnique can more sensibly be a struct.

Co-authored-by: Yong He <yonghe@outlook.com>
---
 source/core/slang-blob.h | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

(limited to 'source/core/slang-blob.h')

diff --git a/source/core/slang-blob.h b/source/core/slang-blob.h
index 1acf279ef..e528f55a8 100644
--- a/source/core/slang-blob.h
+++ b/source/core/slang-blob.h
@@ -50,17 +50,25 @@ public:
     SLANG_NO_THROW size_t SLANG_MCALL getBufferSize() SLANG_OVERRIDE { return m_string.getLength(); }
 
     static ComPtr<ISlangBlob> create(const String& in) { return ComPtr<ISlangBlob>(new StringBlob(in)); }
-    static ComPtr<ISlangBlob> moveCreate(String& in)
-    {
-        auto blob = new StringBlob;
-        blob->m_string.swapWith(in);
-        return ComPtr<ISlangBlob>(blob);
-    }
+
+        /// Moves from in into the created blob. 
+        /// NOTE! That will only use the representation from in, if it is *unique*
+        /// otherwise it will make a new copy.
+        /// This is so that StringBlob won't hold a reference count via a string held externally.
+        /// In contrast StringBlob::create *may* share the representation.
+    static ComPtr<ISlangBlob> moveCreate(String& in);
+    static ComPtr<ISlangBlob> moveCreate(String&& in);
 
 protected:
+        /// A type that is only used to differentiate a constructor. Can construct with 
+        /// MoveUnique{}
+    struct MoveUnique {};
+
     explicit StringBlob(String const& string)
         : m_string(string)
     {}
+
+    StringBlob(MoveUnique, String& string);
     StringBlob() {}
 
         /// Get the contained string
-- 
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