[clang][ExtractAPI] Record availability information on all platforms

Currently ExtractAPI only emits availability information for the
current platform. This makes it easy for clients to get all availability
information for a given symbol in one invocation as opposed to having to invoke
clang once per-platform and then merge the symbol-graphs.

Differential Revision: https://reviews.llvm.org/D130918

1 files changed, 34 insertions, 22 deletions

diff --git a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
index d1bf83c8..0810dec 100644
--- a/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
+++ b/clang/lib/ExtractAPI/Serialization/SymbolGraphSerializer.cpp
@@ -135,30 +135,42 @@ Object serializeSourceRange(const PresumedLoc &BeginLoc,
 /// Serialize the availability attributes of a symbol.
 ///
 /// Availability information contains the introduced, deprecated, and obsoleted
-/// versions of the symbol as semantic versions, if not default.
-/// Availability information also contains flags to indicate if the symbol is
-/// unconditionally unavailable or deprecated,
-/// i.e. \c __attribute__((unavailable)) and \c __attribute__((deprecated)).
+/// versions of the symbol for a given domain (roughly corresponds to a
+/// platform) as semantic versions, if not default.  Availability information
+/// also contains flags to indicate if the symbol is unconditionally unavailable
+/// or deprecated, i.e. \c __attribute__((unavailable)) and \c
+/// __attribute__((deprecated)).
 ///
 /// \returns \c None if the symbol has default availability attributes, or
-/// an \c Object containing the formatted availability information.
-Optional<Object> serializeAvailability(const AvailabilityInfo &Avail) {
-  if (Avail.isDefault())
+/// an \c Array containing the formatted availability information.
+Optional<Array> serializeAvailability(const AvailabilitySet &Availabilities) {
+  if (Availabilities.isDefault())
     return None;
 
-  Object Availability;
-  serializeObject(Availability, "introducedVersion",
-                  serializeSemanticVersion(Avail.Introduced));
-  serializeObject(Availability, "deprecatedVersion",
-                  serializeSemanticVersion(Avail.Deprecated));
-  serializeObject(Availability, "obsoletedVersion",
-                  serializeSemanticVersion(Avail.Obsoleted));
-  if (Avail.isUnavailable())
-    Availability["isUnconditionallyUnavailable"] = true;
-  if (Avail.isUnconditionallyDeprecated())
-    Availability["isUnconditionallyDeprecated"] = true;
+  Array AvailabilityArray;
 
-  return Availability;
+  if (Availabilities.isUnconditionallyDeprecated()) {
+    Object UnconditionallyDeprecated;
+    UnconditionallyDeprecated["domain"] = "*";
+    UnconditionallyDeprecated["isUnconditionallyDeprecated"] = true;
+    AvailabilityArray.emplace_back(std::move(UnconditionallyDeprecated));
+  }
+
+  // Note unconditionally unavailable records are skipped.
+
+  for (const auto &AvailInfo : Availabilities) {
+    Object Availability;
+    Availability["domain"] = AvailInfo.Domain;
+    serializeObject(Availability, "introducedVersion",
+                    serializeSemanticVersion(AvailInfo.Introduced));
+    serializeObject(Availability, "deprecatedVersion",
+                    serializeSemanticVersion(AvailInfo.Deprecated));
+    serializeObject(Availability, "obsoletedVersion",
+                    serializeSemanticVersion(AvailInfo.Obsoleted));
+    AvailabilityArray.emplace_back(std::move(Availability));
+  }
+
+  return AvailabilityArray;
 }
 
 /// Get the language name string for interface language references.
@@ -469,7 +481,7 @@ Object SymbolGraphSerializer::serializeModule() const {
 
 bool SymbolGraphSerializer::shouldSkip(const APIRecord &Record) const {
   // Skip unconditionally unavailable symbols
-  if (Record.Availability.isUnconditionallyUnavailable())
+  if (Record.Availabilities.isUnconditionallyUnavailable())
     return true;
 
   // Filter out symbols prefixed with an underscored as they are understood to
@@ -494,8 +506,8 @@ SymbolGraphSerializer::serializeAPIRecord(const RecordTy &Record) const {
   serializeObject(
       Obj, "location",
       serializeSourceLocation(Record.Location, /*IncludeFileURI=*/true));
-  serializeObject(Obj, "availability",
-                  serializeAvailability(Record.Availability));
+  serializeArray(Obj, "availability",
+                 serializeAvailability(Record.Availabilities));
   serializeObject(Obj, "docComment", serializeDocComment(Record.Comment));
   serializeArray(Obj, "declarationFragments",
                  serializeDeclarationFragments(Record.Declaration));