[Macros] Add a new macro role for synthesized member macros.

Author: hborla

include/swift/AST/MacroDeclaration.h

@@ -35,6 +35,9 @@ enum class MacroRole: uint32_t {
   /// An attached macro that generates attributes for the
   /// members inside the declaration.
   MemberAttribute = 0x08,
+  /// An attached macro that generates synthesized members
+  /// inside the declaration.
+  SynthesizedMembers = 0x10,
 };
 
 /// The contexts in which a particular macro declaration can be used.

include/swift/Basic/SourceManager.h

@@ -44,6 +44,9 @@ class GeneratedSourceInfo {
     /// The expansion of a member attribute attached macro.
     MemberAttributeMacroExpansion,
 
+    /// The expansion of a synthesized member macro.
+    SynthesizedMemberMacroExpansion,
+
     /// A new function body that is replacing an existing function body.
     ReplacedFunctionBody,
 

lib/AST/Decl.cpp

@@ -9703,6 +9703,9 @@ StringRef swift::getMacroRoleString(MacroRole role) {
 
   case MacroRole::MemberAttribute:
     return "memberAttributes";
+
+  case MacroRole::SynthesizedMembers:
+    return "synthesizedMembers";
   }
 }
 
@@ -9745,8 +9748,10 @@ static MacroRoles freestandingMacroRoles =
   (MacroRoles() |
    MacroRole::Expression |
    MacroRole::FreestandingDeclaration);
-static MacroRoles attachedMacroRoles = (MacroRoles() | MacroRole::Accessor |
-                                        MacroRole::MemberAttribute);
+static MacroRoles attachedMacroRoles = (MacroRoles() |
+                                        MacroRole::Accessor |
+                                        MacroRole::MemberAttribute |
+                                        MacroRole::SynthesizedMembers);
 
 bool swift::isFreestandingMacro(MacroRoles contexts) {
   return bool(contexts & freestandingMacroRoles);

lib/AST/DiagnosticEngine.cpp

@@ -1314,7 +1314,8 @@ std::vector<Diagnostic> DiagnosticEngine::getGeneratedSourceBufferNotes(
     case GeneratedSourceInfo::ExpressionMacroExpansion:
     case GeneratedSourceInfo::FreestandingDeclMacroExpansion:
     case GeneratedSourceInfo::AccessorMacroExpansion:
-    case GeneratedSourceInfo::MemberAttributeMacroExpansion: {
+    case GeneratedSourceInfo::MemberAttributeMacroExpansion:
+    case GeneratedSourceInfo::SynthesizedMemberMacroExpansion: {
       SourceRange origRange = expansionNode.getSourceRange();
       DeclName macroName;
       if (auto customAttr = generatedInfo->attachedMacroCustomAttr) {

lib/Basic/SourceLoc.cpp

@@ -314,6 +314,7 @@ void SourceManager::setGeneratedSourceInfo(
   case GeneratedSourceInfo::FreestandingDeclMacroExpansion:
   case GeneratedSourceInfo::AccessorMacroExpansion:
   case GeneratedSourceInfo::MemberAttributeMacroExpansion:
+  case GeneratedSourceInfo::SynthesizedMemberMacroExpansion:
   case GeneratedSourceInfo::PrettyPrinted:
     break;
 

lib/Parse/ParseDecl.cpp

@@ -2225,6 +2225,7 @@ static Optional<MacroRole> getMacroRole(
       .Case("expression", MacroRole::Expression)
       .Case("accessor", MacroRole::Accessor)
       .Case("memberAttributes", MacroRole::MemberAttribute)
+      .Case("synthesizedMembers", MacroRole::SynthesizedMembers)
       .Default(None);
 
   if (!role) {

lib/Parse/ParseRequests.cpp

@@ -174,6 +174,7 @@ SourceFileParsingResult ParseSourceFileRequest::evaluate(Evaluator &evaluator,
     switch (generatedInfo->kind) {
     case GeneratedSourceInfo::FreestandingDeclMacroExpansion:
     case GeneratedSourceInfo::ExpressionMacroExpansion:
+    case GeneratedSourceInfo::SynthesizedMemberMacroExpansion:
     case GeneratedSourceInfo::ReplacedFunctionBody:
     case GeneratedSourceInfo::PrettyPrinted: {
       parser.parseTopLevelItems(items);

lib/Serialization/ModuleFormat.h

@@ -613,6 +613,7 @@ enum class MacroRole : uint8_t {
   FreestandingDeclaration,
   Accessor,
   MemberAttribute,
+  SynthesizedMembers,
 };
 using MacroRoleField = BCFixed<3>;
 

lib/Serialization/Serialization.cpp

@@ -2227,6 +2227,7 @@ static uint8_t getRawStableMacroRole(swift::MacroRole context) {
   CASE(FreestandingDeclaration)
   CASE(Accessor)
   CASE(MemberAttribute)
+  CASE(SynthesizedMembers)
   }
 #undef CASE
   llvm_unreachable("bad result declaration macro kind");