Feature/external compiler reporting (#776)

* Added support for converting SlangResult to string in PlatformUtil.

* * Added reportExternalCompilerError
* Made external compilers use this
* Made DiagnosticSink accept UnownedStringSlice
* Made emitXXX compiler functions return SlangError
* Use smart pointers to handle life of Com interfaces

* * Make SlangResult compatible with HRESULT for some common cases.
* Make PlatformUtil::appendResult return SlangResult
* Compile check SLANG_RESULT.

* Add tests for checking diagnostics from external compilers.

* * Make external compiler tests only run on windows for now.
* Added 'windows' and 'unix' categories

* Added categories based on what backends are available. Will make more tests run on linux and handle case where dxcompiler is not available on appveyor.

* * Added spSessionCheckPassThroughSupport
* Use to determine whats available for categories for tests

* Add support for outputting source filename/s when using pass through.

1 files changed, 38 insertions, 0 deletions

diff --git a/source/core/platform.cpp b/source/core/platform.cpp
index d160fd37c..ff7d8e231 100644
--- a/source/core/platform.cpp
+++ b/source/core/platform.cpp
@@ -27,6 +27,39 @@ namespace Slang
 
 #ifdef _WIN32
 
+// Make sure SlangResult match for common standard window HRESULT
+SLANG_COMPILE_TIME_ASSERT(E_FAIL == SLANG_FAIL);
+SLANG_COMPILE_TIME_ASSERT(E_NOINTERFACE == SLANG_E_NO_INTERFACE);
+SLANG_COMPILE_TIME_ASSERT(E_HANDLE == SLANG_E_INVALID_HANDLE);
+SLANG_COMPILE_TIME_ASSERT(E_NOTIMPL == SLANG_E_NOT_IMPLEMENTED);
+SLANG_COMPILE_TIME_ASSERT(E_INVALIDARG == SLANG_E_INVALID_ARG);
+SLANG_COMPILE_TIME_ASSERT(E_OUTOFMEMORY == SLANG_E_OUT_OF_MEMORY);
+
+/* static */SlangResult PlatformUtil::appendResult(SlangResult res, StringBuilder& builderOut)
+{
+    if (SLANG_FAILED(res) && res != SLANG_FAIL)
+    {
+        LPWSTR buffer = nullptr;
+        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
+            nullptr,
+            res,
+            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+            (LPWSTR)&buffer,
+            0,
+            nullptr);
+
+        if (buffer)
+        {
+            builderOut << " ";
+            // Convert to string
+            builderOut.Append(String::FromWString(buffer));
+            LocalFree(buffer);
+            return SLANG_OK;
+        }
+    }
+    return SLANG_FAIL;
+}
+
 /* static */SlangResult SharedLibrary::loadWithPlatformFilename(char const* platformFileName, SharedLibrary::Handle& handleOut)
 {
     handleOut = nullptr;
@@ -78,6 +111,11 @@ namespace Slang
 
 #else // _WIN32
 
+/* static */SlangResult PlatformUtil::appendResult(SlangResult res, StringBuilder& builderOut)
+{
+    return SLANG_E_NOT_IMPLEMENTED;
+}
+
 /* static */SlangResult SharedLibrary::loadWithPlatformFilename(char const* platformFileName, Handle& handleOut)
 {
     handleOut = nullptr;