Reapply [pseudo] Move pseudoparser from clang to clang-tools-extra"

This reverts commit 049f4e4eab19c6e468e029232e94ca71245b0f56.

The problem was a stray dependency in CLANG_TEST_DEPS which caused cmake
to fail if clang-pseudo wasn't built. This is now removed.

40 files changed, 178 insertions, 116 deletions

diff --git a/clang-tools-extra/CMakeLists.txt b/clang-tools-extra/CMakeLists.txt
index 7b8274a..285e552 100644
--- a/clang-tools-extra/CMakeLists.txt
+++ b/clang-tools-extra/CMakeLists.txt
@@ -15,6 +15,7 @@ add_subdirectory(clang-include-fixer)
 add_subdirectory(clang-move)
 add_subdirectory(clang-query)
 add_subdirectory(pp-trace)
+add_subdirectory(pseudo)
 add_subdirectory(tool-template)
 
 # Add the common testsuite after all the tools.
diff --git a/clang-tools-extra/pseudo/CMakeLists.txt b/clang-tools-extra/pseudo/CMakeLists.txt
new file mode 100644
index 0000000..a10884a
--- /dev/null
+++ b/clang-tools-extra/pseudo/CMakeLists.txt
@@ -0,0 +1,6 @@
+include_directories(include)
+include_directories(${CMAKE_CURRENT_BINARY_DIR}/include)
+add_subdirectory(lib)
+add_subdirectory(tool)
+add_subdirectory(unittests)
+add_subdirectory(test)
diff --git a/clang/lib/Tooling/Syntax/Pseudo/README.md b/clang-tools-extra/pseudo/README.md
index 0958f5d..0958f5d 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/README.md
+++ b/clang-tools-extra/pseudo/README.md
diff --git a/clang/include/clang/Tooling/Syntax/Pseudo/DirectiveMap.h b/clang-tools-extra/pseudo/include/clang-pseudo/DirectiveMap.h
index 177302d..e95f5fb 100644
--- a/clang/include/clang/Tooling/Syntax/Pseudo/DirectiveMap.h
+++ b/clang-tools-extra/pseudo/include/clang-pseudo/DirectiveMap.h
@@ -25,16 +25,15 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_TOOLING_SYNTAX_PREPROCESS_H
-#define LLVM_CLANG_TOOLING_SYNTAX_PREPROCESS_H
+#ifndef CLANG_PSEUDO_DIRECTIVEMAP_H
+#define CLANG_PSEUDO_DIRECTIVEMAP_H
 
+#include "clang-pseudo/Token.h"
 #include "clang/Basic/TokenKinds.h"
-#include "clang/Tooling/Syntax/Pseudo/Token.h"
 #include <vector>
 
 namespace clang {
 class LangOptions;
-namespace syntax {
 namespace pseudo {
 
 /// Describes the structure of a source file, as seen by the preprocessor.
@@ -142,7 +141,6 @@ private:
 };
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
 
 #endif
diff --git a/clang/include/clang/Tooling/Syntax/Pseudo/Grammar.h b/clang-tools-extra/pseudo/include/clang-pseudo/Grammar.h
index 086809e..d7bbee3 100644
--- a/clang/include/clang/Tooling/Syntax/Pseudo/Grammar.h
+++ b/clang-tools-extra/pseudo/include/clang-pseudo/Grammar.h
@@ -33,8 +33,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_TOOLING_SYNTAX_GRAMMAR_H
-#define LLVM_CLANG_TOOLING_SYNTAX_GRAMMAR_H
+#ifndef CLANG_PSEUDO_GRAMMAR_H
+#define CLANG_PSEUDO_GRAMMAR_H
 
 #include "clang/Basic/TokenKinds.h"
 #include "llvm/ADT/ArrayRef.h"
@@ -44,7 +44,6 @@
 #include <vector>
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 // A SymbolID uniquely identifies a terminal/non-terminal symbol in a grammar.
 // Non-terminal IDs are indexes into a table of non-terminal symbols.
@@ -178,7 +177,6 @@ struct GrammarTable {
 };
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
 
 #endif // LLVM_CLANG_TOOLING_SYNTAX_GRAMMAR_H
diff --git a/clang/include/clang/Tooling/Syntax/Pseudo/LRGraph.h b/clang-tools-extra/pseudo/include/clang-pseudo/LRGraph.h
index 1de15b7..ba244d8 100644
--- a/clang/include/clang/Tooling/Syntax/Pseudo/LRGraph.h
+++ b/clang-tools-extra/pseudo/include/clang-pseudo/LRGraph.h
@@ -28,15 +28,14 @@
 //  in making decisions.
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_TOOLING_SYNTAX_PSEUDO_LRGRAPH_H
-#define LLVM_CLANG_TOOLING_SYNTAX_PSEUDO_LRGRAPH_H
+#ifndef CLANG_PSEUDO_LRGRAPH_H
+#define CLANG_PSEUDO_LRGRAPH_H
 
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
+#include "clang-pseudo/Grammar.h"
 #include "llvm/ADT/Hashing.h"
 #include <vector>
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 
 // An LR item -- a grammar rule with a dot at some position of the body.
@@ -152,23 +151,22 @@ private:
 };
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
 
 namespace llvm {
-// Support clang::syntax::pseudo::Item as DenseMap keys.
-template <> struct DenseMapInfo<clang::syntax::pseudo::Item> {
-  static inline clang::syntax::pseudo::Item getEmptyKey() {
-    return clang::syntax::pseudo::Item::sentinel(-1);
+// Support clang::pseudo::Item as DenseMap keys.
+template <> struct DenseMapInfo<clang::pseudo::Item> {
+  static inline clang::pseudo::Item getEmptyKey() {
+    return clang::pseudo::Item::sentinel(-1);
   }
-  static inline clang::syntax::pseudo::Item getTombstoneKey() {
-    return clang::syntax::pseudo::Item::sentinel(-2);
+  static inline clang::pseudo::Item getTombstoneKey() {
+    return clang::pseudo::Item::sentinel(-2);
   }
-  static unsigned getHashValue(const clang::syntax::pseudo::Item &I) {
+  static unsigned getHashValue(const clang::pseudo::Item &I) {
     return hash_value(I);
   }
-  static bool isEqual(const clang::syntax::pseudo::Item &LHS,
-                      const clang::syntax::pseudo::Item &RHS) {
+  static bool isEqual(const clang::pseudo::Item &LHS,
+                      const clang::pseudo::Item &RHS) {
     return LHS == RHS;
   }
 };
diff --git a/clang/include/clang/Tooling/Syntax/Pseudo/LRTable.h b/clang-tools-extra/pseudo/include/clang-pseudo/LRTable.h
index 025f7f1..b7e166ae 100644
--- a/clang/include/clang/Tooling/Syntax/Pseudo/LRTable.h
+++ b/clang-tools-extra/pseudo/include/clang-pseudo/LRTable.h
@@ -34,16 +34,15 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_TOOLING_SYNTAX_PSEUDO_LRTABLE_H
-#define LLVM_CLANG_TOOLING_SYNTAX_PSEUDO_LRTABLE_H
+#ifndef CLANG_PSEUDO_LRTABLE_H
+#define CLANG_PSEUDO_LRTABLE_H
 
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
+#include "clang-pseudo/Grammar.h"
 #include "llvm/ADT/ArrayRef.h"
 #include <cstdint>
 #include <vector>
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 
 // Represents the LR parsing table, which can efficiently the question "what is
@@ -176,7 +175,6 @@ private:
 llvm::raw_ostream &operator<<(llvm::raw_ostream &, const LRTable::Action &);
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
 
 #endif // LLVM_CLANG_TOOLING_SYNTAX_PSEUDO_LRTABLE_H
diff --git a/clang/include/clang/Tooling/Syntax/Pseudo/Token.h b/clang-tools-extra/pseudo/include/clang-pseudo/Token.h
index a54146c..69c75329c 100644
--- a/clang/include/clang/Tooling/Syntax/Pseudo/Token.h
+++ b/clang-tools-extra/pseudo/include/clang-pseudo/Token.h
@@ -25,8 +25,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_CLANG_TOOLING_SYNTAX_TOKEN_H
-#define LLVM_CLANG_TOOLING_SYNTAX_TOKEN_H
+#ifndef CLANG_PSEUDO_TOKEN_H
+#define CLANG_PSEUDO_TOKEN_H
 
 #include "clang/Basic/LLVM.h"
 #include "clang/Basic/TokenKinds.h"
@@ -39,7 +39,6 @@
 
 namespace clang {
 class LangOptions;
-namespace syntax {
 namespace pseudo {
 
 /// A single C++ or preprocessor token.
@@ -199,7 +198,6 @@ TokenStream cook(const TokenStream &, const clang::LangOptions &);
 TokenStream stripComments(const TokenStream &);
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
 
 #endif
diff --git a/clang/lib/Tooling/Syntax/Pseudo/CMakeLists.txt b/clang-tools-extra/pseudo/lib/CMakeLists.txt
index 1e00905..7239a58 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/CMakeLists.txt
+++ b/clang-tools-extra/pseudo/lib/CMakeLists.txt
@@ -1,6 +1,6 @@
 set(LLVM_LINK_COMPONENTS Support)
 
-add_clang_library(clangToolingSyntaxPseudo
+add_clang_library(clangPseudo
   DirectiveMap.cpp
   Grammar.cpp
   GrammarBNF.cpp
diff --git a/clang/lib/Tooling/Syntax/Pseudo/DirectiveMap.cpp b/clang-tools-extra/pseudo/lib/DirectiveMap.cpp
index 06a3b44..6e66708 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/DirectiveMap.cpp
+++ b/clang-tools-extra/pseudo/lib/DirectiveMap.cpp
@@ -6,13 +6,12 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/DirectiveMap.h"
+#include "clang-pseudo/DirectiveMap.h"
 #include "clang/Basic/IdentifierTable.h"
 #include "clang/Basic/TokenKinds.h"
 #include "llvm/Support/FormatVariadic.h"
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 namespace {
 
@@ -151,8 +150,8 @@ DirectiveMap DirectiveMap::parse(const TokenStream &Code) {
 }
 
 static void dump(llvm::raw_ostream &OS, const DirectiveMap &, unsigned Indent);
-static void dump(llvm::raw_ostream &OS, const DirectiveMap::Directive &Directive,
-                 unsigned Indent) {
+static void dump(llvm::raw_ostream &OS,
+                 const DirectiveMap::Directive &Directive, unsigned Indent) {
   OS.indent(Indent) << llvm::formatv("#{0} ({1} tokens)\n",
                                      tok::getPPKeywordSpelling(Directive.Kind),
                                      Directive.Tokens.size());
@@ -205,5 +204,4 @@ OSTREAM_DUMP(DirectiveMap::Code)
 #undef OSTREAM_DUMP
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/Pseudo/Grammar.cpp b/clang-tools-extra/pseudo/lib/Grammar.cpp
index 4f1a511..542d30c 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/Grammar.cpp
+++ b/clang-tools-extra/pseudo/lib/Grammar.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
+#include "clang-pseudo/Grammar.h"
 #include "clang/Basic/TokenKinds.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/STLExtras.h"
@@ -15,7 +15,6 @@
 #include "llvm/Support/raw_ostream.h"
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 
 Rule::Rule(SymbolID Target, llvm::ArrayRef<SymbolID> Sequence)
@@ -181,5 +180,4 @@ static llvm::ArrayRef<std::string> getTerminalNames() {
 GrammarTable::GrammarTable() : Terminals(getTerminalNames()) {}
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/Pseudo/GrammarBNF.cpp b/clang-tools-extra/pseudo/lib/GrammarBNF.cpp
index bc90a96..5e473971 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/GrammarBNF.cpp
+++ b/clang-tools-extra/pseudo/lib/GrammarBNF.cpp
@@ -6,15 +6,14 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang-pseudo/Grammar.h"
 #include "clang/Basic/TokenKinds.h"
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/FormatVariadic.h"
 #include <memory>
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 
 namespace {
@@ -244,5 +243,4 @@ Grammar::parseBNF(llvm::StringRef BNF, std::vector<std::string> &Diagnostics) {
 }
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/Pseudo/LRGraph.cpp b/clang-tools-extra/pseudo/lib/LRGraph.cpp
index 17e4771..edb544f 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/LRGraph.cpp
+++ b/clang-tools-extra/pseudo/lib/LRGraph.cpp
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/LRGraph.h"
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
+#include "clang-pseudo/LRGraph.h"
+#include "clang-pseudo/Grammar.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/Hashing.h"
 #include "llvm/ADT/STLExtras.h"
@@ -15,16 +15,16 @@
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/raw_ostream.h"
 
-using ItemSet = std::vector<clang::syntax::pseudo::Item>;
+using ItemSet = std::vector<clang::pseudo::Item>;
 
 namespace llvm {
-// Support clang::syntax::pseudo::Item as DenseMap keys.
+// Support clang::pseudo::Item as DenseMap keys.
 template <> struct DenseMapInfo<ItemSet> {
   static inline ItemSet getEmptyKey() {
-    return {DenseMapInfo<clang::syntax::pseudo::Item>::getEmptyKey()};
+    return {DenseMapInfo<clang::pseudo::Item>::getEmptyKey()};
   }
   static inline ItemSet getTombstoneKey() {
-    return {DenseMapInfo<clang::syntax::pseudo::Item>::getTombstoneKey()};
+    return {DenseMapInfo<clang::pseudo::Item>::getTombstoneKey()};
   }
   static unsigned getHashValue(const ItemSet &I) {
     return llvm::hash_combine_range(I.begin(), I.end());
@@ -36,7 +36,6 @@ template <> struct DenseMapInfo<ItemSet> {
 } // namespace llvm
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 namespace {
 
@@ -227,5 +226,4 @@ LRGraph LRGraph::buildLR0(const Grammar &G) {
 }
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/Pseudo/LRTable.cpp b/clang-tools-extra/pseudo/lib/LRTable.cpp
index 957d17a..b9ff7e4 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/LRTable.cpp
+++ b/clang-tools-extra/pseudo/lib/LRTable.cpp
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/LRTable.h"
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
+#include "clang-pseudo/LRTable.h"
+#include "clang-pseudo/Grammar.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -15,7 +15,6 @@
 #include "llvm/Support/raw_ostream.h"
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 
 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const LRTable::Action &A) {
@@ -122,5 +121,4 @@ llvm::ArrayRef<LRTable::Action> LRTable::find(StateID Src, SymbolID ID) const {
 }
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/Pseudo/LRTableBuild.cpp b/clang-tools-extra/pseudo/lib/LRTableBuild.cpp
index aaf9cad..cb4ea69 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/LRTableBuild.cpp
+++ b/clang-tools-extra/pseudo/lib/LRTableBuild.cpp
@@ -6,23 +6,23 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang-pseudo/Grammar.h"
+#include "clang-pseudo/LRGraph.h"
+#include "clang-pseudo/LRTable.h"
 #include "clang/Basic/TokenKinds.h"
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
-#include "clang/Tooling/Syntax/Pseudo/LRGraph.h"
-#include "clang/Tooling/Syntax/Pseudo/LRTable.h"
 #include <cstdint>
 
 namespace llvm {
-template <> struct DenseMapInfo<clang::syntax::pseudo::LRTable::Entry> {
-  using Entry = clang::syntax::pseudo::LRTable::Entry;
+template <> struct DenseMapInfo<clang::pseudo::LRTable::Entry> {
+  using Entry = clang::pseudo::LRTable::Entry;
   static inline Entry getEmptyKey() {
-    static Entry E{static_cast<clang::syntax::pseudo::SymbolID>(-1), 0,
-                   clang::syntax::pseudo::LRTable::Action::sentinel()};
+    static Entry E{static_cast<clang::pseudo::SymbolID>(-1), 0,
+                   clang::pseudo::LRTable::Action::sentinel()};
     return E;
   }
   static inline Entry getTombstoneKey() {
-    static Entry E{static_cast<clang::syntax::pseudo::SymbolID>(-2), 0,
-                   clang::syntax::pseudo::LRTable::Action::sentinel()};
+    static Entry E{static_cast<clang::pseudo::SymbolID>(-2), 0,
+                   clang::pseudo::LRTable::Action::sentinel()};
     return E;
   }
   static unsigned getHashValue(const Entry &I) {
@@ -36,7 +36,6 @@ template <> struct DenseMapInfo<clang::syntax::pseudo::LRTable::Entry> {
 } // namespace llvm
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 
 class LRTable::Builder {
@@ -139,5 +138,4 @@ LRTable LRTable::buildSLR(const Grammar &G) {
 }
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/Pseudo/Lex.cpp b/clang-tools-extra/pseudo/lib/Lex.cpp
index ac0120c..f5a2395 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/Lex.cpp
+++ b/clang-tools-extra/pseudo/lib/Lex.cpp
@@ -6,14 +6,13 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang-pseudo/Token.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/TokenKinds.h"
 #include "clang/Lex/Lexer.h"
 #include "clang/Lex/LiteralSupport.h"
-#include "clang/Tooling/Syntax/Pseudo/Token.h"
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 
 TokenStream lex(const std::string &Code, const clang::LangOptions &LangOpts) {
@@ -110,5 +109,4 @@ TokenStream cook(const TokenStream &Code, const LangOptions &LangOpts) {
 }
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/Pseudo/Token.cpp b/clang-tools-extra/pseudo/lib/Token.cpp
index e7a572a..f07c1d1 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/Token.cpp
+++ b/clang-tools-extra/pseudo/lib/Token.cpp
@@ -6,13 +6,12 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/Token.h"
+#include "clang-pseudo/Token.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/FormatVariadic.h"
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 
 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const Token &T) {
@@ -105,5 +104,4 @@ TokenStream stripComments(const TokenStream &Input) {
 }
 
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/Pseudo/cxx.bnf b/clang-tools-extra/pseudo/lib/cxx.bnf
index 2619ce1..2619ce1 100644
--- a/clang/lib/Tooling/Syntax/Pseudo/cxx.bnf
+++ b/clang-tools-extra/pseudo/lib/cxx.bnf
diff --git a/clang-tools-extra/pseudo/test/CMakeLists.txt b/clang-tools-extra/pseudo/test/CMakeLists.txt
new file mode 100644
index 0000000..334acb5
--- /dev/null
+++ b/clang-tools-extra/pseudo/test/CMakeLists.txt
@@ -0,0 +1,38 @@
+# Set CLANG_TOOLS_DIR to buildtree/bin, or buildtree/%(build_mode)s/bin if the
+# location is dynamic. The latter must be interpolated by lit configs.
+# FIXME: this is duplicated in many places.
+if (CMAKE_CFG_INTDIR STREQUAL ".")
+  set(LLVM_BUILD_MODE ".")
+else ()
+  set(LLVM_BUILD_MODE "%(build_mode)s")
+endif ()
+string(REPLACE ${CMAKE_CFG_INTDIR} ${LLVM_BUILD_MODE} CLANG_TOOLS_DIR ${LLVM_RUNTIME_OUTPUT_INTDIR})
+
+set(CLANG_PSEUDO_TEST_DEPS
+  clang-pseudo
+  ClangPseudoTests
+  )
+
+foreach(dep FileCheck not)
+  if(TARGET ${dep})
+    list(APPEND CLANG_PSEUDO_TEST_DEPS ${dep})
+  endif()
+endforeach()
+
+configure_lit_site_cfg(
+  ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.py.in
+  ${CMAKE_CURRENT_BINARY_DIR}/lit.site.cfg.py
+  MAIN_CONFIG
+  ${CMAKE_CURRENT_SOURCE_DIR}/lit.cfg.py
+  )
+
+configure_lit_site_cfg(
+  ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.site.cfg.py.in
+  ${CMAKE_CURRENT_BINARY_DIR}/Unit/lit.site.cfg.py
+  MAIN_CONFIG
+  ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.cfg.py
+  )
+
+add_lit_testsuite(check-clang-pseudo "Running the clang-pseudo regression tests"
+  ${CMAKE_CURRENT_BINARY_DIR}
+  DEPENDS ${CLANG_PSEUDO_TEST_DEPS})
diff --git a/clang-tools-extra/pseudo/test/Unit/lit.cfg.py b/clang-tools-extra/pseudo/test/Unit/lit.cfg.py
new file mode 100644
index 0000000..1ba9626
--- /dev/null
+++ b/clang-tools-extra/pseudo/test/Unit/lit.cfg.py
@@ -0,0 +1,19 @@
+import lit.formats
+config.name = "clangPseudo Unit Tests"
+config.test_format = lit.formats.GoogleTest('.', 'Tests')
+config.test_source_root = config.clang_pseudo_binary_dir + "/unittests"
+config.test_exec_root = config.clang_pseudo_binary_dir + "/unittests"
+
+# Point the dynamic loader at dynamic libraries in 'lib'.
+# FIXME: it seems every project has a copy of this logic. Move it somewhere.
+import platform
+if platform.system() == 'Darwin':
+    shlibpath_var = 'DYLD_LIBRARY_PATH'
+elif platform.system() == 'Windows':
+    shlibpath_var = 'PATH'
+else:
+    shlibpath_var = 'LD_LIBRARY_PATH'
+config.environment[shlibpath_var] = os.path.pathsep.join((
+    "@SHLIBDIR@", "@LLVM_LIBS_DIR@",
+    config.environment.get(shlibpath_var,'')))
+
diff --git a/clang-tools-extra/pseudo/test/Unit/lit.site.cfg.py.in b/clang-tools-extra/pseudo/test/Unit/lit.site.cfg.py.in
new file mode 100644
index 0000000..4107b0d
--- /dev/null
+++ b/clang-tools-extra/pseudo/test/Unit/lit.site.cfg.py.in
@@ -0,0 +1,11 @@
+@LIT_SITE_CFG_IN_HEADER@
+# This is a shim to run the gtest unittests in ../unittests using lit.
+
+config.llvm_libs_dir = "@LLVM_LIBS_DIR@"
+config.shlibdir = "@SHLIBDIR@"
+
+config.clang_pseudo_source_dir = "@CMAKE_CURRENT_SOURCE_DIR@/.."
+config.clang_pseudo_binary_dir = "@CMAKE_CURRENT_BINARY_DIR@/.."
+
+# Delegate logic to lit.cfg.py.
+lit_config.load_config(config, "@CMAKE_CURRENT_SOURCE_DIR@/Unit/lit.cfg.py")
diff --git a/clang/test/Syntax/check-cxx-bnf.test b/clang-tools-extra/pseudo/test/check-cxx-bnf.test
index e7e71942..e7e71942 100644
--- a/clang/test/Syntax/check-cxx-bnf.test
+++ b/clang-tools-extra/pseudo/test/check-cxx-bnf.test
diff --git a/clang/test/Syntax/lex.c b/clang-tools-extra/pseudo/test/lex.c
index 39b114e..39b114e 100644
--- a/clang/test/Syntax/lex.c
+++ b/clang-tools-extra/pseudo/test/lex.c
diff --git a/clang-tools-extra/pseudo/test/lit.cfg.py b/clang-tools-extra/pseudo/test/lit.cfg.py
new file mode 100644
index 0000000..d92c95c
--- /dev/null
+++ b/clang-tools-extra/pseudo/test/lit.cfg.py
@@ -0,0 +1,16 @@
+import lit.llvm
+
+lit.llvm.initialize(lit_config, config)
+lit.llvm.llvm_config.use_default_substitutions()
+
+config.name = 'ClangPseudo'
+config.suffixes = ['.test', '.c', '.cpp']
+config.excludes = ['Inputs']
+config.test_format = lit.formats.ShTest(not lit.llvm.llvm_config.use_lit_shell)
+config.test_source_root = config.clang_pseudo_source_dir + "/test"
+config.test_exec_root = config.clang_pseudo_binary_dir + "/test"
+
+config.environment['PATH'] = os.path.pathsep.join((
+        config.clang_tools_dir,
+        config.llvm_tools_dir,
+        config.environment['PATH']))
diff --git a/clang-tools-extra/pseudo/test/lit.local.cfg b/clang-tools-extra/pseudo/test/lit.local.cfg
new file mode 100644
index 0000000..899b7e1
--- /dev/null
+++ b/clang-tools-extra/pseudo/test/lit.local.cfg
@@ -0,0 +1,2 @@
+cxx_bnf_file = os.path.join(config.clang_pseudo_source_dir, 'lib', 'cxx.bnf')
+config.substitutions.append(('%cxx-bnf-file', cxx_bnf_file))
diff --git a/clang-tools-extra/pseudo/test/lit.site.cfg.py.in b/clang-tools-extra/pseudo/test/lit.site.cfg.py.in
new file mode 100644
index 0000000..2f7a095
--- /dev/null
+++ b/clang-tools-extra/pseudo/test/lit.site.cfg.py.in
@@ -0,0 +1,14 @@
+@LIT_SITE_CFG_IN_HEADER@
+
+# Variables needed for common llvm config.
+config.clang_tools_dir = "@CLANG_TOOLS_DIR@"
+config.lit_tools_dir = "@LLVM_LIT_TOOLS_DIR@"
+config.llvm_tools_dir = lit_config.substitute("@LLVM_TOOLS_DIR@")
+config.llvm_libs_dir = lit_config.substitute("@LLVM_LIBS_DIR@")
+config.target_triple = "@TARGET_TRIPLE@"
+config.python_executable = "@Python3_EXECUTABLE@"
+
+config.clang_pseudo_source_dir = "@CMAKE_CURRENT_SOURCE_DIR@/.."
+config.clang_pseudo_binary_dir = "@CMAKE_CURRENT_BINARY_DIR@/.."
+# Delegate logic to lit.cfg.py.
+lit_config.load_config(config, "@CMAKE_CURRENT_SOURCE_DIR@/lit.cfg.py")
diff --git a/clang/test/Syntax/lr-build-basic.test b/clang-tools-extra/pseudo/test/lr-build-basic.test
index d02fdae..d02fdae 100644
--- a/clang/test/Syntax/lr-build-basic.test
+++ b/clang-tools-extra/pseudo/test/lr-build-basic.test
diff --git a/clang/test/Syntax/lr-build-conflicts.test b/clang-tools-extra/pseudo/test/lr-build-conflicts.test
index 4292a71..4292a71 100644
--- a/clang/test/Syntax/lr-build-conflicts.test
+++ b/clang-tools-extra/pseudo/test/lr-build-conflicts.test
diff --git a/clang/tools/clang-pseudo/CMakeLists.txt b/clang-tools-extra/pseudo/tool/CMakeLists.txt
index c03c8c6..bf73f89 100644
--- a/clang/tools/clang-pseudo/CMakeLists.txt
+++ b/clang-tools-extra/pseudo/tool/CMakeLists.txt
@@ -4,12 +4,13 @@ add_clang_tool(clang-pseudo
   ClangPseudo.cpp
   )
 
-set(CLANG_PSEUDO_LIB_DEPS
+clang_target_link_libraries(clang-pseudo
+  PRIVATE
   clangBasic
-  clangToolingSyntaxPseudo
   )
 
-clang_target_link_libraries(clang-pseudo
+target_link_libraries(clang-pseudo
   PRIVATE
-  ${CLANG_PSEUDO_LIB_DEPS}
+  clangPseudo
   )
+
diff --git a/clang/tools/clang-pseudo/ClangPseudo.cpp b/clang-tools-extra/pseudo/tool/ClangPseudo.cpp
index c03cc0a..076ec5b 100644
--- a/clang/tools/clang-pseudo/ClangPseudo.cpp
+++ b/clang-tools-extra/pseudo/tool/ClangPseudo.cpp
@@ -6,18 +6,18 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang-pseudo/DirectiveMap.h"
+#include "clang-pseudo/Grammar.h"
+#include "clang-pseudo/LRGraph.h"
+#include "clang-pseudo/LRTable.h"
+#include "clang-pseudo/Token.h"
 #include "clang/Basic/LangOptions.h"
-#include "clang/Tooling/Syntax/Pseudo/DirectiveMap.h"
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
-#include "clang/Tooling/Syntax/Pseudo/LRGraph.h"
-#include "clang/Tooling/Syntax/Pseudo/LRTable.h"
-#include "clang/Tooling/Syntax/Pseudo/Token.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/MemoryBuffer.h"
 
-using clang::syntax::pseudo::Grammar;
+using clang::pseudo::Grammar;
 using llvm::cl::desc;
 using llvm::cl::init;
 using llvm::cl::opt;
@@ -64,19 +64,17 @@ int main(int argc, char *argv[]) {
     if (PrintGrammar)
       llvm::outs() << G->dump();
     if (PrintGraph)
-      llvm::outs() << clang::syntax::pseudo::LRGraph::buildLR0(*G).dumpForTests(
-          *G);
+      llvm::outs() << clang::pseudo::LRGraph::buildLR0(*G).dumpForTests(*G);
     if (PrintTable)
-      llvm::outs() << clang::syntax::pseudo::LRTable::buildSLR(*G).dumpForTests(
-          *G);
+      llvm::outs() << clang::pseudo::LRTable::buildSLR(*G).dumpForTests(*G);
     return 0;
   }
 
   if (Source.getNumOccurrences()) {
     std::string Text = readOrDie(Source);
     clang::LangOptions LangOpts; // FIXME: use real options.
-    auto Stream = clang::syntax::pseudo::lex(Text, LangOpts);
-    auto Structure = clang::syntax::pseudo::DirectiveMap::parse(Stream);
+    auto Stream = clang::pseudo::lex(Text, LangOpts);
+    auto Structure = clang::pseudo::DirectiveMap::parse(Stream);
 
     if (PrintDirectiveMap)
       llvm::outs() << Structure;
diff --git a/clang/unittests/Tooling/Syntax/Pseudo/CMakeLists.txt b/clang-tools-extra/pseudo/unittests/CMakeLists.txt
index 0ece44a..e4919f8 100644
--- a/clang/unittests/Tooling/Syntax/Pseudo/CMakeLists.txt
+++ b/clang-tools-extra/pseudo/unittests/CMakeLists.txt
@@ -2,7 +2,8 @@ set(LLVM_LINK_COMPONENTS
   Support
   )
 
-add_clang_unittest(ClangPseudoTests
+add_custom_target(ClangPseudoUnitTests)
+add_unittest(ClangPseudoUnitTests ClangPseudoTests
   DirectiveMapTest.cpp
   GrammarTest.cpp
   LRTableTest.cpp
@@ -13,11 +14,10 @@ clang_target_link_libraries(ClangPseudoTests
   PRIVATE
   clangBasic
   clangLex
-  clangToolingSyntaxPseudo
   clangTesting
   )
 
 target_link_libraries(ClangPseudoTests
   PRIVATE
-  LLVMTestingSupport
+  clangPseudo
   )
diff --git a/clang/unittests/Tooling/Syntax/Pseudo/DirectiveMapTest.cpp b/clang-tools-extra/pseudo/unittests/DirectiveMapTest.cpp
index 1c3220b..1feae34 100644
--- a/clang/unittests/Tooling/Syntax/Pseudo/DirectiveMapTest.cpp
+++ b/clang-tools-extra/pseudo/unittests/DirectiveMapTest.cpp
@@ -6,18 +6,17 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/DirectiveMap.h"
+#include "clang-pseudo/DirectiveMap.h"
 
+#include "clang-pseudo/Token.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/TokenKinds.h"
-#include "clang/Tooling/Syntax/Pseudo/Token.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 namespace {
 
@@ -148,5 +147,4 @@ TEST(DirectiveMap, ParseBroken) {
 
 } // namespace
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/unittests/Tooling/Syntax/Pseudo/GrammarTest.cpp b/clang-tools-extra/pseudo/unittests/GrammarTest.cpp
index 1b928b3..2a10706 100644
--- a/clang/unittests/Tooling/Syntax/Pseudo/GrammarTest.cpp
+++ b/clang-tools-extra/pseudo/unittests/GrammarTest.cpp
@@ -6,13 +6,12 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
+#include "clang-pseudo/Grammar.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include <memory>
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 namespace {
 
@@ -157,5 +156,4 @@ simple-type-specifier := INT
 
 } // namespace
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/unittests/Tooling/Syntax/Pseudo/LRTableTest.cpp b/clang-tools-extra/pseudo/unittests/LRTableTest.cpp
index 88ac697..9823159 100644
--- a/clang/unittests/Tooling/Syntax/Pseudo/LRTableTest.cpp
+++ b/clang-tools-extra/pseudo/unittests/LRTableTest.cpp
@@ -6,15 +6,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/LRTable.h"
+#include "clang-pseudo/LRTable.h"
+#include "clang-pseudo/Grammar.h"
 #include "clang/Basic/TokenKinds.h"
-#include "clang/Tooling/Syntax/Pseudo/Grammar.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include <vector>
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 namespace {
 
@@ -52,5 +51,4 @@ TEST(LRTable, Builder) {
 
 } // namespace
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/unittests/Tooling/Syntax/Pseudo/TokenTest.cpp b/clang-tools-extra/pseudo/unittests/TokenTest.cpp
index c431457..1357d23 100644
--- a/clang/unittests/Tooling/Syntax/Pseudo/TokenTest.cpp
+++ b/clang-tools-extra/pseudo/unittests/TokenTest.cpp
@@ -6,14 +6,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/Tooling/Syntax/Pseudo/Token.h"
+#include "clang-pseudo/Token.h"
 #include "clang/Basic/LangOptions.h"
 #include "clang/Basic/TokenKinds.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
 namespace clang {
-namespace syntax {
 namespace pseudo {
 namespace {
 
@@ -191,5 +190,4 @@ TEST(TokenTest, DropComments) {
 
 } // namespace
 } // namespace pseudo
-} // namespace syntax
 } // namespace clang
diff --git a/clang/lib/Tooling/Syntax/CMakeLists.txt b/clang/lib/Tooling/Syntax/CMakeLists.txt
index f8d9184..e933fae 100644
--- a/clang/lib/Tooling/Syntax/CMakeLists.txt
+++ b/clang/lib/Tooling/Syntax/CMakeLists.txt
@@ -19,5 +19,3 @@ add_clang_library(clangToolingSyntax
   DEPENDS
   omp_gen
   )
-
-add_subdirectory(Pseudo)
diff --git a/clang/test/CMakeLists.txt b/clang/test/CMakeLists.txt
index 15b3847..d7cc8d2 100644
--- a/clang/test/CMakeLists.txt
+++ b/clang/test/CMakeLists.txt
@@ -76,7 +76,6 @@ list(APPEND CLANG_TEST_DEPS
   clang-repl
   clang-diff
   clang-scan-deps
-  clang-pseudo
   diagtool
   hmaptool
   )
diff --git a/clang/test/Syntax/lit.local.cfg b/clang/test/Syntax/lit.local.cfg
deleted file mode 100644
index 5a2e1cd..0000000
--- a/clang/test/Syntax/lit.local.cfg
+++ /dev/null
@@ -1,4 +0,0 @@
-cxx_bnf_file = os.path.join(config.clang_src_dir, 'lib', 'Tooling', 'Syntax',
-                            'Pseudo', 'cxx.bnf')
-config.substitutions.append(('%cxx-bnf-file',
-                             '%s' % (cxx_bnf_file)))
diff --git a/clang/tools/CMakeLists.txt b/clang/tools/CMakeLists.txt
index 933b428..b071a77 100644
--- a/clang/tools/CMakeLists.txt
+++ b/clang/tools/CMakeLists.txt
@@ -14,7 +14,6 @@ add_clang_subdirectory(clang-offload-bundler)
 add_clang_subdirectory(clang-offload-wrapper)
 add_clang_subdirectory(clang-scan-deps)
 add_clang_subdirectory(clang-repl)
-add_clang_subdirectory(clang-pseudo)
 
 add_clang_subdirectory(c-index-test)
 
diff --git a/clang/unittests/Tooling/Syntax/CMakeLists.txt b/clang/unittests/Tooling/Syntax/CMakeLists.txt
index a21d558..174f3e7 100644
--- a/clang/unittests/Tooling/Syntax/CMakeLists.txt
+++ b/clang/unittests/Tooling/Syntax/CMakeLists.txt
@@ -28,5 +28,3 @@ target_link_libraries(SyntaxTests
   PRIVATE
   LLVMTestingSupport
 )
-
-add_subdirectory(Pseudo)