Shader cache bugfixes and test additions (#2467)

* Preliminary graphics shader test

* Added test checking that a graphics shader is correctly split into two different entries

* Removed testing only addition

* Changed RequirementDictionary to an OrderedDictionary and added SerialTypeInfo for OrderedDictionary; Added entry point mangled name to the dependency hash

* Added test covering failure case discovered as part of Falcor integration

* Changed DifferentiableTypeSemanticContext::m_mapTypeToIDifferentiableWitness to an OrderedDictionary

* Added serializedAST field to Module in order to save serialized ASTs to avoid reserialization as much as possible; Added classes field to Session in order to save the output of SerialClassesUtil::create to avoid recreating as much as possible

* Changed AST hashing to hash the contents of a Module's file dependencies; Renamed all references to AST hashing to contents hashing

* Further cleanup

* Moved contents hash computation up to Linkage::loadModule and added field to Module to save the computed contents digest

* Changed PreprocessorHandler::handleFileDependency to optionally take an ISlangBlob* containing file contents and changed FrontEndPreprocessorHandler::handleFileDependency to add the source code for an included file to the module's contents digest

* Removed extraneous addToDigest call

* Fixed accidental removal of source code hash for module being loaded

1 files changed, 3 insertions, 2 deletions

diff --git a/source/slang/slang-preprocessor.cpp b/source/slang/slang-preprocessor.cpp
index fca8f5029..c977e44ab 100644
--- a/source/slang/slang-preprocessor.cpp
+++ b/source/slang/slang-preprocessor.cpp
@@ -32,9 +32,10 @@ void PreprocessorHandler::handleEndOfTranslationUnit(Preprocessor* preprocessor)
     SLANG_UNUSED(preprocessor);
 }
 
-void PreprocessorHandler::handleFileDependency(String const& path)
+void PreprocessorHandler::handleFileDependency(String const& path, ISlangBlob* contents)
 {
     SLANG_UNUSED(path);
+    SLANG_UNUSED(contents);
 }
 
 // In order to simplify the naming scheme, we will nest the implementaiton of the
@@ -2972,7 +2973,7 @@ static SlangResult readFile(
     //
     if( auto handler = context->m_preprocessor->handler )
     {
-        handler->handleFileDependency(path);
+        handler->handleFileDependency(path, *outBlob);
     }
 
     return SLANG_OK;