Move regex literal parsing logic from SwiftCompilerSources to ASTGen

ASTGen always builds with the host Swift compiler, without requiring
bootstrapping, and is enabled in more places. Move the regex literal
parsing logic there so it is enabled in more host environments, and
makes use of CMake's Swift support. Enable all of the regex literal
tests when ASTGen is built, to ensure everything is working.

Remove the "AST" and "Parse" Swift modules from SwiftCompilerSources,
because they are no longer needed.

Author: DougGregor

SwiftCompilerSources/CMakeLists.txt

@@ -241,15 +241,9 @@ else()
 #include \"Basic/BasicBridging.h\"
 #include \"Basic/SourceLoc.h\"
 
-#include \"AST/ASTBridging.h\"
-#include \"AST/DiagnosticEngine.h\"
-#include \"AST/DiagnosticConsumer.h\"
-
 #include \"SIL/SILBridging.h\"
 
 #include \"SILOptimizer/OptimizerBridging.h\"
-
-#include \"Parse/RegexParserBridging.h\"
 ")
   add_custom_command(
     OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/HeaderDependencies.cpp"

SwiftCompilerSources/Package.swift

@@ -48,39 +48,22 @@ let package = Package(
     .library(
       name: "swiftCompilerModules",
       type: .static,
-      targets: ["Basic", "AST", "Parse", "SIL", "Optimizer", "_CompilerRegexParser"]),
+      targets: ["Basic", "SIL", "Optimizer"]),
   ],
   dependencies: [
   ],
   // Note that targets and their dependencies must align with
   // 'SwiftCompilerSources/Sources/CMakeLists.txt'
   targets: [
-    .compilerModuleTarget(
-      name: "_CompilerRegexParser",
-      dependencies: [],
-      path: "_RegexParser_Sources",
-      swiftSettings: [
-        // Workaround until `_CompilerRegexParser` is imported as implementation-only
-        // by `_StringProcessing`.
-        .unsafeFlags([
-          "-Xfrontend",
-          "-disable-implicit-string-processing-module-import"
-        ])]),
     .compilerModuleTarget(
       name: "Basic",
       dependencies: []),
-    .compilerModuleTarget(
-      name: "AST",
-      dependencies: ["Basic"]),
-    .compilerModuleTarget(
-      name: "Parse",
-      dependencies: ["Basic", "AST", "_CompilerRegexParser"]),
     .compilerModuleTarget(
       name: "SIL",
       dependencies: ["Basic"]),
     .compilerModuleTarget(
       name: "Optimizer",
-      dependencies: ["Basic", "SIL", "Parse"]),
+      dependencies: ["Basic", "SIL"]),
   ],
   cxxLanguageStandard: .cxx17
 )

SwiftCompilerSources/Sources/AST/CMakeLists.txt

@@ -8,11 +8,6 @@
 
 # NOTE: Subdirectories must be added in dependency order.
 
-if(SWIFT_BUILD_REGEX_PARSER_IN_COMPILER)
-  add_subdirectory(_RegexParser)
-endif()
 add_subdirectory(Basic)
-add_subdirectory(AST)
-add_subdirectory(Parse)
 add_subdirectory(SIL)
 add_subdirectory(Optimizer)

SwiftCompilerSources/Sources/AST/DiagnosticEngine.swift

@@ -7,7 +7,7 @@
 # See http://swift.org/CONTRIBUTORS.txt for Swift project authors
 
 set(dependencies)
-list(APPEND dependencies Basic SIL Parse)
+list(APPEND dependencies Basic SIL)
 
 add_swift_compiler_module(Optimizer DEPENDS ${dependencies})
 

SwiftCompilerSources/Sources/CMakeLists.txt

@@ -12,14 +12,12 @@
 
 import SIL
 import OptimizerBridging
-import Parse
 
 @_cdecl("initializeSwiftModules")
 public func initializeSwiftModules() {
   registerSILClasses()
   registerSwiftAnalyses()
   registerSwiftPasses()
-  initializeSwiftParseModules()
 }
 
 private func registerPass(

SwiftCompilerSources/Sources/Optimizer/CMakeLists.txt

@@ -13,9 +13,7 @@
 extern "C" {
 
 void initializeSwiftModules();
-void initializeSwiftParseModules();
 
 }
 
 void initializeSwiftModules() {}
-void initializeSwiftParseModules() {}

SwiftCompilerSources/Sources/Optimizer/PassManager/PassRegistration.swift

@@ -12,10 +12,7 @@ module CBasicBridging {
 
 module ASTBridging {
   header "swift/AST/AnyFunctionRef.h"
-  header "swift/AST/ASTBridging.h"
   header "swift/AST/Builtins.h"
-  header "swift/AST/DiagnosticEngine.h"
-  header "swift/AST/DiagnosticConsumer.h"
   header "swift/AST/ForeignAsyncConvention.h"
   header "swift/AST/ForeignErrorConvention.h"
   header "swift/AST/SubstitutionMap.h"
@@ -41,8 +38,3 @@ module OptimizerBridging {
   header "swift/SILOptimizer/OptimizerBridging.h"
   export *
 }
-
-module _RegexParserBridging {
-  header "swift/Parse/RegexParserBridging.h"
-  export *
-}