IDownstreamCompiler interface (#2361)

* WIP with hierarchical enums.

* Some small fixes and improvements around artifact desc related types.

* Improvements around hierarchical enum.

* Fixes to get Artifact types refactor to be able to execute tests.

* Attempt to better categorize PTX.

* Work around for potentially unused function warning.

* Typo fix.

* Simplify Artifact header.

* Small improvements around Artifact kind/payload/style.

* Added IDestroyable/ICastable

* Add IArtifactList.

* First impl of IArtifactUtil.

* Use the ICastable interface for IArtifactRepresentation.

* Added IArtifactRepresentation & IArtifactAssociated.

* Add SLANG_OVERRIDE to avoid gcc/clang warning.

* Fix calling convention issue on win32.

* Fix missing SLANG_OVERRIDE.

* First attempt at file abstraction around Artifact.

* Added creation of lock file.

* Move functionality for determining file paths to the IArtifactUtil.
Add casting to ICastable.

* Added some casting/finding mechanisms.

* Simplify IArtifact interface, and use Items for file reps.

* Fix problem with libraries on DXIL.

* Split out ArtifactRepresentation.

* Move ArtifactDesc functionality to ArtifactDescUtil. ArtifactInfoUtil becomes ArtifactDescUtil.

* Split implementations from the interfaces for Artifact.

* Use TypeTextUtil for target name outputting.

* Add artifact impls.

* Add ICastableList

* Added UnknownCastableAdapter

* Make ISlangSharedLibrary derive from ICastable, and remain backwards compatible with slang-llvm.

* Refactor Representation on Artifact.

* Make our ISlangBlobs also derive from ICastable.
Make ISlangBlob atomic ref counted.

* Split out CastableList and related types, and placed in core.

* Small fixes around IArtifact.
Improve IArtifact docs.
First impl of getChildren for IArtifact.

* Documentation improvements for Artifact related types.

* Fix typo.

* Special case adding a ICastableList to a LazyCastableList.

* Small simplification of LazyCastableList, by adding State member.

* Removed the ILockFile interface because IFileArtifactRepresentation can be used.

* Implement DiagnosticsArtifactRepresentation.

* Added PostEmitMetadataArtifactRepresentation

* Add searching by predicate.
Added handling of accessing Artifact as ISharedLibrary

* Fix typo.

* Add find to IArtifacgtList.
Fix some missing SLANG_NO_THROW.

* Small improvements around ArtifactDesc types.

* Another small change around ArtifactKind.

* Some more shuffling of ArtifactDesc.

* Make IArtifact castable
Remove IArtifactList
Made IArtifactContainer derive from IArtifact
Made ModuleLibrary atomic ref counted/given IModuleLibrary interface.

* Must call _requireChildren before any children access.

* Fix missing SLANG_MCALL on castAs.

* Fix missing SLANG_OVERRIDE.

* Added IArtifactHandler

* Use ICastable for basis of scope/lookup.

* WIP first attempt to remove CompileResult.

* Fix support for for downstream compiler shared library adapter.

* Fix issues found when replacing CompileResult.

* Fix typo.

* Fix getting items form 'significant' member of an Artifact.

* Split out ArtifactUtil & ArtifactHandler.

* Work around for problem on Visual studio.

* Improve searching.

* Add missing files.

* Split out Artifact associated types.
Don't produce a container by default - use associated for 'metadata'.

* Remove no longer used ArtifactPayload type.

* Generalized converting representations.
Small improvements to artifacts.

* Fix intermediate dumping issue.

* Removed #if 0 out CompileResult.
Remove DownstreamCompileResult maybeDumpIntermediate.

* Pull out functionality for dumping artifact output into ArtifactOutputUtil
Fixed a bug in naming files based on ArtifactDesc.

* std::atomic issue.

* Pull out types from DownstreamCompile to simplify moving to an interface.

* Fix typo.

* Use IDownstreamCompiler interface.
Split out DownstreamCompilerUtil and DownstreamCompilerSet.

* Update projects.

* Fix missing SLANG_MCALL.

* Fix calling convention of IDownstreamCompiler impls.

* Split out binary work arounds into a dep1.cpp/h

* Small reorganising around DownstreamCompilerInfo.

* Remove Desc library functionality to DownstreamCompilerUtil.

* Expand IDiagnostics interface.
Rename associated impls with Impl suffix.

* Fix outputting as text bug.
Some small improvements.

* Add fix around prefix for dumping.
Improved how handling for extensions work form ArtifactDesc.

* Dump assembly if available.

* Simplify some of Dep1 definitions.

1 files changed, 68 insertions, 0 deletions

diff --git a/source/compiler-core/slang-downstream-compiler-set.h b/source/compiler-core/slang-downstream-compiler-set.h
new file mode 100644
index 000000000..2a3d1ac01
--- /dev/null
+++ b/source/compiler-core/slang-downstream-compiler-set.h
@@ -0,0 +1,68 @@
+#ifndef SLANG_DOWNSTREAM_COMPILER_SET_H
+#define SLANG_DOWNSTREAM_COMPILER_SET_H
+
+#include "slang-downstream-compiler.h"
+
+namespace Slang
+{
+
+class DownstreamCompilerSet : public RefObject
+{
+public:
+    typedef RefObject Super;
+
+        /// Find all the available compilers
+    void getCompilerDescs(List<IDownstreamCompiler::Desc>& outCompilerDescs) const;
+        /// Returns list of all compilers
+    void getCompilers(List<IDownstreamCompiler*>& outCompilers) const;
+
+        /// Get a compiler
+    IDownstreamCompiler* getCompiler(const DownstreamCompilerDesc& compilerDesc) const;
+  
+        /// Will replace if there is one with same desc
+    void addCompiler(IDownstreamCompiler* compiler);
+
+        /// Get a default compiler
+    IDownstreamCompiler* getDefaultCompiler(SlangSourceLanguage sourceLanguage) const { return m_defaultCompilers[int(sourceLanguage)];  }
+        /// Set the default compiler
+    void setDefaultCompiler(SlangSourceLanguage sourceLanguage, IDownstreamCompiler* compiler) { m_defaultCompilers[int(sourceLanguage)] = compiler;  }
+
+        /// True if has a compiler of the specified type
+    bool hasCompiler(SlangPassThrough compilerType) const;
+
+    void remove(SlangPassThrough compilerType);
+
+    void clear() { m_compilers.clear(); }
+
+    bool hasSharedLibrary(ISlangSharedLibrary* lib);
+    void addSharedLibrary(ISlangSharedLibrary* lib);
+
+    ~DownstreamCompilerSet()
+    {
+        // A compiler may be implemented in a shared library, so release all first.
+        m_compilers.clearAndDeallocate();
+        for (auto& defaultCompiler : m_defaultCompilers)
+        {
+            defaultCompiler.setNull();
+        }
+
+        // Release any shared libraries
+        m_sharedLibraries.clearAndDeallocate();
+    }
+
+protected:
+
+    Index _findIndex(const DownstreamCompilerDesc& desc) const;
+
+
+    ComPtr<IDownstreamCompiler> m_defaultCompilers[int(SLANG_SOURCE_LANGUAGE_COUNT_OF)];
+    // This could be a dictionary/map - but doing a linear search is going to be fine and it makes
+    // somethings easier.
+    List<ComPtr<IDownstreamCompiler>> m_compilers;
+
+    List<ComPtr<ISlangSharedLibrary>> m_sharedLibraries;
+};
+
+}
+
+#endif