[clang] [HLSL][RootSignature] Implement Lexing of DescriptorTables (PR #122981)

[Finn Plummer via cfe-commits]

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+//=== ParseHLSLRootSignatureTest.cpp - Parse Root Signature tests ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/HeaderSearchOptions.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Lex/ModuleLoader.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+
+#include "clang/Parse/ParseHLSLRootSignature.h"
+#include "gtest/gtest.h"
+
+using namespace llvm::hlsl::root_signature;
+using namespace clang;
+
+namespace {
+
+// The test fixture.
+class ParseHLSLRootSignatureTest : public ::testing::Test {
+protected:
+  ParseHLSLRootSignatureTest()
+      : FileMgr(FileMgrOpts), DiagID(new DiagnosticIDs()),
+        Diags(DiagID, new DiagnosticOptions, new IgnoringDiagConsumer()),
+        SourceMgr(Diags, FileMgr), TargetOpts(new TargetOptions) {
+    TargetOpts->Triple = "x86_64-apple-darwin11.1.0";
+    Target = TargetInfo::CreateTargetInfo(Diags, TargetOpts);
+  }
+
+  Preprocessor *CreatePP(StringRef Source, TrivialModuleLoader &ModLoader) {
+    std::unique_ptr<llvm::MemoryBuffer> Buf =
+        llvm::MemoryBuffer::getMemBuffer(Source);
+    SourceMgr.setMainFileID(SourceMgr.createFileID(std::move(Buf)));
+
+    HeaderSearch HeaderInfo(std::make_shared<HeaderSearchOptions>(), SourceMgr,
+                            Diags, LangOpts, Target.get());
+    Preprocessor *PP =
+        new Preprocessor(std::make_shared<PreprocessorOptions>(), Diags,
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inbelic wrote:

Hm, I have no idea what I was doing before to get it to not work... you can just pass the unique pointer as is and it works😅 

https://github.com/llvm/llvm-project/pull/122981