Feature/source loc refactor (#668)

* * Remove the need for IRHighLevelDecoration in Emit
* Use the IRLayoutDecoration for GeometryShaderPrimitiveTypeModifier

* Initial look at at variable byte encoding, and simple unit test.

* Fixing problems with comparison due to naming differences with slang/fxc.

* * More tests and perf improvements for byte encoding.
* Mechanism to detect processor and processor features in main slang header.

* Split out cpu based defines into slang-cpu-defines.h so do not polute slang.h

* Support for variable byte encoding on serialization.

* Removed unused flag.

* Fix warning.

* Fix calcMsByte32 for 0 values without using intrinsic.

* Fix a mistake in calculating maximum instruction size.

* Introduced the idea of SourceUnit.

* Small improvements around naming.
Add more functionality - including getting the HumaneLoc.

* Add support for #line default

* Compiling with new SourceLoc handling.

* Fix off by one on #line directives.

* Can use 32bits for SourceLoc. Fix serialize to use that.

* Small fixes and comment on usage.

* Premake run.

* Fix signed warning.

* Fix typo on StringSlicePool::has found in review.

1 files changed, 9 insertions, 12 deletions

diff --git a/source/slang/slang.cpp b/source/slang/slang.cpp
index e3b675cd7..eab9401b4 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -372,12 +372,12 @@ SlangResult CompileRequest::loadFile(String const& path, ISlangBlob** outBlob)
 
 RefPtr<Expr> CompileRequest::parseTypeString(TranslationUnitRequest * translationUnit, String typeStr, RefPtr<Scope> scope)
 {
-    Slang::SourceFile srcFile;
-    srcFile.content = UnownedStringSlice(typeStr.begin(), typeStr.end());
+    Slang::RefPtr<Slang::SourceFile> srcFile = sourceManager->newSourceFile(String("type string"), typeStr);
+    
     DiagnosticSink sink;
     sink.sourceManager = sourceManager;
     auto tokens = preprocessSource(
-        &srcFile,
+        srcFile,
         &sink,
         nullptr,
         Dictionary<String,String>(),
@@ -675,7 +675,7 @@ void CompileRequest::addTranslationUnitSourceBlob(
     String const&   path,
     ISlangBlob*     sourceBlob)
 {
-    RefPtr<SourceFile> sourceFile = getSourceManager()->allocateSourceFile(path, sourceBlob);
+    RefPtr<SourceFile> sourceFile = getSourceManager()->newSourceFile(path, sourceBlob);
 
     addTranslationUnitSourceFile(translationUnitIndex, sourceFile);
 }
@@ -685,7 +685,7 @@ void CompileRequest::addTranslationUnitSourceString(
     String const&   path,
     String const&   source)
 {
-    RefPtr<SourceFile> sourceFile = getSourceManager()->allocateSourceFile(path, source);
+    RefPtr<SourceFile> sourceFile = getSourceManager()->newSourceFile(path, source);
 
     addTranslationUnitSourceFile(translationUnitIndex, sourceFile);
 }
@@ -804,7 +804,7 @@ RefPtr<ModuleDecl> CompileRequest::loadModule(
     // TODO: decide which options, if any, should be inherited.
     translationUnit->compileFlags = 0;
 
-    RefPtr<SourceFile> sourceFile = getSourceManager()->allocateSourceFile(path, sourceBlob);
+    RefPtr<SourceFile> sourceFile = getSourceManager()->newSourceFile(path, sourceBlob);
 
     translationUnit->sourceFiles.Add(sourceFile);
 
@@ -883,10 +883,9 @@ RefPtr<ModuleDecl> CompileRequest::findOrImportModule(
     IncludeHandlerImpl includeHandler;
     includeHandler.request = this;
 
-    auto expandedLoc = getSourceManager()->expandSourceLoc(loc);
-
-    String pathIncludedFrom = expandedLoc.getSpellingPath();
-
+    // Get the original path
+    String pathIncludedFrom= getSourceManager()->getPath(loc, SourceLocType::Original);
+    
     String foundPath;
     ComPtr<ISlangBlob> foundSourceBlob;
     IncludeResult includeResult = includeHandler.TryToFindIncludeFile(fileName, pathIncludedFrom, &foundPath, foundSourceBlob.writeRef());
@@ -971,8 +970,6 @@ void Session::addBuiltinSource(
 
     auto translationUnitIndex = compileRequest->addTranslationUnit(SourceLanguage::Slang, path);
 
-    RefPtr<SourceFile> sourceFile = builtinSourceManager.allocateSourceFile(path, source);
-
     compileRequest->addTranslationUnitSourceString(
         translationUnitIndex,
         path,