https://github.com/aviralg created 
https://github.com/llvm/llvm-project/pull/205946

None

>From 4ecaefc93f376f5edcdff01217b1ba5b156ce693 Mon Sep 17 00:00:00 2001
From: Aviral Goel <[email protected]>
Date: Thu, 25 Jun 2026 16:05:31 -0700
Subject: [PATCH] Add archive

---
 .../Core/EntityLinker/Archive.h               |  72 +++++++
 .../Core/EntityLinker/TUSummaryEncoding.h     |  27 +++
 .../Core/Model/BuildNamespace.h               |   6 +-
 .../Core/Model/PrivateFieldNames.def          |   3 +
 .../Core/Serialization/JSONFormat.h           |  13 ++
 .../Core/Serialization/SerializationFormat.h  |  12 +-
 .../Core/CMakeLists.txt                       |   1 +
 .../Core/ModelStringConversions.h             |   4 +
 .../Core/Serialization/JSONFormat/Archive.cpp | 185 ++++++++++++++++++
 .../Serialization/JSONFormat/Artifact.cpp     |  19 +-
 .../Serialization/JSONFormat/JSONFormatImpl.h |   5 +-
 .../JSONFormat/TUSummaryEncoding.cpp          |  19 +-
 .../Archive/Inputs/duplicate-member.json      |  32 +++
 .../Inputs/member-mismatched-type.json        |  18 ++
 .../Archive/Inputs/member-not-object.json     |   9 +
 .../Inputs/member-triple-mismatch.json        |  21 ++
 .../Archive/Inputs/members-not-array.json     |   9 +
 .../Archive/Inputs/mismatched-type.json       |   9 +
 .../Archive/Inputs/missing-members.json       |   8 +
 .../Archive/Inputs/missing-namespace.json     |   5 +
 .../Archive/Inputs/missing-target-triple.json |   8 +
 .../Archive/Inputs/missing-type.json          |   8 +
 .../Inputs/namespace-invalid-kind.json        |   9 +
 .../Inputs/namespace-missing-kind.json        |   8 +
 .../Inputs/namespace-missing-name.json        |   8 +
 .../Archive/Inputs/namespace-wrong-kind.json  |   9 +
 .../Inputs/not-normalized-target-triple.json  |   9 +
 .../ssaf-format/Archive/Inputs/rt-empty.json  |   9 +
 .../Archive/Inputs/rt-multiple-members.json   |  43 ++++
 .../Archive/Inputs/rt-single-member.json      |  21 ++
 .../ssaf-format/Archive/round-trip.test       |  27 +++
 .../ssaf-format/Archive/top-level.test        | 107 ++++++++++
 .../Artifact/Inputs/rt-archive-empty.json     |   9 +
 .../ssaf-format/Artifact/round-trip.test      |   9 +
 .../ssaf-format/Artifact/top-level.test       |   2 +-
 clang/tools/clang-ssaf-format/SSAFFormat.cpp  |  11 +-
 .../ScalableStaticAnalysis/ArchiveTest.cpp    |  32 +++
 .../BuildNamespaceTest.cpp                    |   7 +
 .../ScalableStaticAnalysis/CMakeLists.txt     |   1 +
 .../TUSummaryExtractorFrontendActionTest.cpp  |  14 ++
 .../ModelStringConversionsTest.cpp            |  13 ++
 .../Registries/MockSerializationFormat.cpp    |  11 ++
 .../Registries/MockSerializationFormat.h      |   4 +
 .../ScalableStaticAnalysis/TestFixture.h      |   1 +
 44 files changed, 842 insertions(+), 15 deletions(-)
 create mode 100644 
clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h
 create mode 100644 
clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Archive.cpp
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/duplicate-member.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-mismatched-type.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-not-object.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-triple-mismatch.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/members-not-array.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/mismatched-type.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-members.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-namespace.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-target-triple.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-type.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-invalid-kind.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-missing-kind.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-missing-name.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-wrong-kind.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/not-normalized-target-triple.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-empty.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-multiple-members.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-single-member.json
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/round-trip.test
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Archive/top-level.test
 create mode 100644 
clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-archive-empty.json
 create mode 100644 clang/unittests/ScalableStaticAnalysis/ArchiveTest.cpp

diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h 
b/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h
new file mode 100644
index 0000000000000..44ff71fc11156
--- /dev/null
+++ b/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h
@@ -0,0 +1,72 @@
+//===- Archive.h ------------------------------------------------*- C++ 
-*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the Archive class, which represents a static archive of
+// translation unit summary encodings (the SSAF analogue of an ar/lib/libtool
+// static archive).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_ENTITYLINKER_ARCHIVE_H
+#define LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_ENTITYLINKER_ARCHIVE_H
+
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
+#include "clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h"
+#include "llvm/TargetParser/Triple.h"
+#include <memory>
+#include <set>
+
+namespace clang::ssaf {
+
+/// Represents a static archive of translation unit summary encodings.
+///
+/// An Archive bundles member translation units without performing entity
+/// resolution, mirroring the role of ar / libtool -static / lib.exe in
+/// native build pipelines. The final linker is responsible for selective
+/// inclusion when an Archive appears on its command line.
+///
+/// Archives are single-architecture: every member's target triple must
+/// equal the archive's. Multi-architecture archives are expressed as a
+/// fat wrapper around per-architecture Archive instances rather than as
+/// a single mixed-architecture archive.
+///
+/// Members are stored as encoded TUSummaryEncoding objects: the archive
+/// tool never decodes per-entity payloads, and the linker consumes them
+/// as-is during its selective inclusion pass.
+class Archive {
+  friend class EntityLinker;
+  friend class SerializationFormat;
+  friend class TestFixture;
+
+  // Target triple of the archive. All member TUs must share this triple.
+  llvm::Triple TargetTriple;
+
+  // The namespace identifying this archive (kind=Archive).
+  BuildNamespace Namespace;
+
+  // Member translation units, ordered by their TUNamespace. Membership is
+  // by namespace identity: inserting a TU whose TUNamespace already exists
+  // in the set is rejected during deserialization. The comparator reaches
+  // the members' private TUNamespace field via friend access on
+  // TUSummaryEncoding rather than through a public accessor.
+  std::set<std::unique_ptr<TUSummaryEncoding>, TUSummaryEncodingByNamespace>
+      Members;
+
+public:
+  Archive(llvm::Triple TargetTriple, BuildNamespace Namespace)
+      : TargetTriple(std::move(TargetTriple)), Namespace(std::move(Namespace)) 
{
+  }
+
+  const llvm::Triple &getTargetTriple() const { return TargetTriple; }
+
+  const BuildNamespace &getNamespace() const { return Namespace; }
+};
+
+} // namespace clang::ssaf
+
+#endif // LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_ENTITYLINKER_ARCHIVE_H
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h
 
b/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h
index 2c672a55e4873..edd7009b20957 100644
--- 
a/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h
+++ 
b/clang/include/clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h
@@ -26,6 +26,8 @@
 
 namespace clang::ssaf {
 
+struct TUSummaryEncodingByNamespace;
+
 /// Represents a translation unit summary in its serialized encoding.
 ///
 /// TUSummaryEncoding holds entity summary data in a format-specific encoding
@@ -36,6 +38,7 @@ class TUSummaryEncoding {
   friend class EntityLinker;
   friend class SerializationFormat;
   friend class TestFixture;
+  friend struct TUSummaryEncodingByNamespace;
 
   // Target triple of the translation unit.
   llvm::Triple TargetTriple;
@@ -62,6 +65,30 @@ class TUSummaryEncoding {
   const llvm::Triple &getTargetTriple() const { return TargetTriple; }
 };
 
+/// Comparator that orders TUSummaryEncoding pointers by their TUNamespace.
+/// Lives here (next to TUSummaryEncoding) rather than inside Archive so it
+/// can reach the private TUNamespace field via friend access without
+/// exposing a public accessor. The transparent overloads enable
+/// std::set::find() lookup by a bare BuildNamespace.
+struct TUSummaryEncodingByNamespace {
+  using is_transparent = void;
+
+  bool operator()(const std::unique_ptr<TUSummaryEncoding> &A,
+                  const std::unique_ptr<TUSummaryEncoding> &B) const {
+    return A->TUNamespace < B->TUNamespace;
+  }
+
+  bool operator()(const std::unique_ptr<TUSummaryEncoding> &A,
+                  const BuildNamespace &B) const {
+    return A->TUNamespace < B;
+  }
+
+  bool operator()(const BuildNamespace &A,
+                  const std::unique_ptr<TUSummaryEncoding> &B) const {
+    return A < B->TUNamespace;
+  }
+};
+
 } // namespace clang::ssaf
 
 #endif // 
LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_ENTITYLINKER_TUSUMMARYENCODING_H
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h 
b/clang/include/clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h
index 6da5a9e42c4da..4c7b23cec9131 100644
--- a/clang/include/clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h
+++ b/clang/include/clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h
@@ -27,7 +27,11 @@
 
 namespace clang::ssaf {
 
-enum class BuildNamespaceKind : unsigned short { CompilationUnit, LinkUnit };
+enum class BuildNamespaceKind : unsigned short {
+  CompilationUnit,
+  LinkUnit,
+  Archive
+};
 
 /// Represents a single namespace in the build process.
 ///
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/Model/PrivateFieldNames.def 
b/clang/include/clang/ScalableStaticAnalysis/Core/Model/PrivateFieldNames.def
index 44931026ba428..ead25397f6526 100644
--- 
a/clang/include/clang/ScalableStaticAnalysis/Core/Model/PrivateFieldNames.def
+++ 
b/clang/include/clang/ScalableStaticAnalysis/Core/Model/PrivateFieldNames.def
@@ -19,6 +19,9 @@
 
 FIELD(BuildNamespace, Kind)
 FIELD(BuildNamespace, Name)
+FIELD(Archive, TargetTriple)
+FIELD(Archive, Namespace)
+FIELD(Archive, Members)
 FIELD(EntityId, Index)
 FIELD(EntityIdTable, Entities)
 FIELD(EntityLinkage, Linkage)
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h 
b/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h
index 9d9b1ff0bbb51..1a84aff1eebc5 100644
--- a/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h
+++ b/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h
@@ -68,6 +68,10 @@ class JSONFormat final : public SerializationFormat {
   llvm::Error writeLUSummaryEncoding(const LUSummaryEncoding &SummaryEncoding,
                                      llvm::StringRef Path) override;
 
+  llvm::Expected<Archive> readArchive(llvm::StringRef Path) override;
+
+  llvm::Error writeArchive(const Archive &A, llvm::StringRef Path) override;
+
   llvm::Expected<WPASuite> readWPASuite(llvm::StringRef Path) override;
 
   llvm::Error writeWPASuite(const WPASuite &Suite,
@@ -122,6 +126,15 @@ class JSONFormat final : public SerializationFormat {
   llvm::Expected<LUSummaryEncoding>
   readLUSummaryEncodingFromObject(const Object &Root);
 
+  /// Parses an Archive from an already-validated root JSON object. See
+  /// \c readTUSummaryFromObject for caller responsibilities.
+  llvm::Expected<Archive> readArchiveFromObject(const Object &Root);
+
+  /// Serializes a TUSummaryEncoding to a JSON object including its
+  /// self-describing \c type field. Used both by \c writeTUSummaryEncoding
+  /// and by the Archive writer to emit member entries.
+  Object tuSummaryEncodingToJSON(const TUSummaryEncoding &SE) const;
+
   /// Parses a WPASuite from an already-validated root JSON object. See
   /// \c readTUSummaryFromObject for caller responsibilities.
   llvm::Expected<WPASuite> readWPASuiteFromObject(const Object &Root);
diff --git 
a/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/SerializationFormat.h
 
b/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/SerializationFormat.h
index ca3ee9ce3362c..f7fdbe08878df 100644
--- 
a/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/SerializationFormat.h
+++ 
b/clang/include/clang/ScalableStaticAnalysis/Core/Serialization/SerializationFormat.h
@@ -14,6 +14,7 @@
 #ifndef 
LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_SERIALIZATION_SERIALIZATIONFORMAT_H
 #define 
LLVM_CLANG_SCALABLESTATICANALYSIS_CORE_SERIALIZATION_SERIALIZATIONFORMAT_H
 
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
@@ -40,7 +41,12 @@ using Artifact = std::variant<TUSummary, LUSummary, 
WPASuite>;
 /// Lazily-deserialized counterpart of \c Artifact: the same on-disk
 /// artifacts but with their per-entity summary payloads left as opaque
 /// format-specific encodings rather than fully resolved analysis results.
-using ArtifactEncoding = std::variant<TUSummaryEncoding, LUSummaryEncoding>;
+///
+/// \c Archive appears only in this variant: the archive tool and the
+/// linker pass member payloads through without decoding them, so a fully
+/// decoded archive shape would have no consumer.
+using ArtifactEncoding =
+    std::variant<TUSummaryEncoding, LUSummaryEncoding, Archive>;
 
 /// Abstract base class for serialization formats.
 class SerializationFormat {
@@ -94,6 +100,10 @@ class SerializationFormat {
   writeLUSummaryEncoding(const LUSummaryEncoding &SummaryEncoding,
                          llvm::StringRef Path) = 0;
 
+  virtual llvm::Expected<Archive> readArchive(llvm::StringRef Path) = 0;
+
+  virtual llvm::Error writeArchive(const Archive &A, llvm::StringRef Path) = 0;
+
   virtual llvm::Expected<WPASuite> readWPASuite(llvm::StringRef Path) = 0;
 
   virtual llvm::Error writeWPASuite(const WPASuite &Suite,
diff --git a/clang/lib/ScalableStaticAnalysis/Core/CMakeLists.txt 
b/clang/lib/ScalableStaticAnalysis/Core/CMakeLists.txt
index b2cde5f225445..3f8114c28cbcd 100644
--- a/clang/lib/ScalableStaticAnalysis/Core/CMakeLists.txt
+++ b/clang/lib/ScalableStaticAnalysis/Core/CMakeLists.txt
@@ -12,6 +12,7 @@ add_clang_library(clangScalableStaticAnalysisCore
   Model/EntityLinkage.cpp
   Model/EntityName.cpp
   Model/SummaryName.cpp
+  Serialization/JSONFormat/Archive.cpp
   Serialization/JSONFormat/Artifact.cpp
   Serialization/JSONFormat/JSONEntitySummaryEncoding.cpp
   Serialization/JSONFormat/JSONFormatImpl.cpp
diff --git a/clang/lib/ScalableStaticAnalysis/Core/ModelStringConversions.h 
b/clang/lib/ScalableStaticAnalysis/Core/ModelStringConversions.h
index ee1603e50025f..0f011dd5639dc 100644
--- a/clang/lib/ScalableStaticAnalysis/Core/ModelStringConversions.h
+++ b/clang/lib/ScalableStaticAnalysis/Core/ModelStringConversions.h
@@ -36,6 +36,8 @@ inline llvm::StringRef 
buildNamespaceKindToString(BuildNamespaceKind BNK) {
     return "CompilationUnit";
   case BuildNamespaceKind::LinkUnit:
     return "LinkUnit";
+  case BuildNamespaceKind::Archive:
+    return "Archive";
   }
   llvm_unreachable("Unhandled BuildNamespaceKind variant");
 }
@@ -48,6 +50,8 @@ buildNamespaceKindFromString(llvm::StringRef Str) {
     return BuildNamespaceKind::CompilationUnit;
   if (Str == "LinkUnit")
     return BuildNamespaceKind::LinkUnit;
+  if (Str == "Archive")
+    return BuildNamespaceKind::Archive;
   return std::nullopt;
 }
 
diff --git 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Archive.cpp 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Archive.cpp
new file mode 100644
index 0000000000000..061a54c2246cf
--- /dev/null
+++ b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Archive.cpp
@@ -0,0 +1,185 @@
+//===- Archive.cpp 
--------------------------------------------------------===//
+//
+// 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 "JSONFormatImpl.h"
+
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h"
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
+#include "llvm/TargetParser/Triple.h"
+
+namespace clang::ssaf {
+
+//----------------------------------------------------------------------------
+// Archive
+//----------------------------------------------------------------------------
+
+llvm::Expected<Archive> JSONFormat::readArchive(llvm::StringRef Path) {
+  auto ExpectedJSON = readJSON(Path);
+  if (!ExpectedJSON) {
+    return ErrorBuilder::wrap(ExpectedJSON.takeError())
+        .context(ErrorMessages::ReadingFromFile, "Archive", Path)
+        .build();
+  }
+
+  Object *RootObjectPtr = ExpectedJSON->getAsObject();
+  if (!RootObjectPtr) {
+    return ErrorBuilder::create(std::errc::invalid_argument,
+                                ErrorMessages::FailedToReadObject, "Archive",
+                                "object")
+        .context(ErrorMessages::ReadingFromFile, "Archive", Path)
+        .build();
+  }
+
+  if (auto Err = checkSummaryType(*RootObjectPtr, JSONTypeValueArchive)) {
+    return ErrorBuilder::wrap(std::move(Err))
+        .context(ErrorMessages::ReadingFromFile, "Archive", Path)
+        .build();
+  }
+
+  auto ExpectedArchive = readArchiveFromObject(*RootObjectPtr);
+  if (!ExpectedArchive) {
+    return ErrorBuilder::wrap(ExpectedArchive.takeError())
+        .context(ErrorMessages::ReadingFromFile, "Archive", Path)
+        .build();
+  }
+
+  return std::move(*ExpectedArchive);
+}
+
+llvm::Expected<Archive>
+JSONFormat::readArchiveFromObject(const Object &RootObject) {
+  auto OptTargetTriple = RootObject.getString("target_triple");
+  if (!OptTargetTriple) {
+    return ErrorBuilder::create(std::errc::invalid_argument,
+                                ErrorMessages::FailedToReadObjectAtField,
+                                "TargetTriple", "target_triple", "string")
+        .build();
+  }
+
+  if (auto Err = validateNormalizedTargetTriple(*OptTargetTriple)) {
+    return ErrorBuilder::wrap(std::move(Err))
+        .context(ErrorMessages::ReadingFromField, "TargetTriple",
+                 "target_triple")
+        .build();
+  }
+
+  llvm::Triple T(*OptTargetTriple);
+
+  const Object *NamespaceObject = RootObject.getObject("namespace");
+  if (!NamespaceObject) {
+    return ErrorBuilder::create(std::errc::invalid_argument,
+                                ErrorMessages::FailedToReadObjectAtField,
+                                "BuildNamespace", "namespace", "object")
+        .build();
+  }
+
+  auto ExpectedNamespace = buildNamespaceFromJSON(*NamespaceObject);
+  if (!ExpectedNamespace) {
+    return ErrorBuilder::wrap(ExpectedNamespace.takeError())
+        .context(ErrorMessages::ReadingFromField, "BuildNamespace", 
"namespace")
+        .build();
+  }
+
+  if (getKind(*ExpectedNamespace) != BuildNamespaceKind::Archive) {
+    return ErrorBuilder::create(
+               std::errc::invalid_argument,
+               ErrorMessages::MismatchedSummaryType,
+               buildNamespaceKindToJSON(BuildNamespaceKind::Archive),
+               "namespace.kind",
+               buildNamespaceKindToJSON(getKind(*ExpectedNamespace)))
+        .build();
+  }
+
+  Archive A(std::move(T), std::move(*ExpectedNamespace));
+
+  const Array *MembersArray = RootObject.getArray("members");
+  if (!MembersArray) {
+    return ErrorBuilder::create(std::errc::invalid_argument,
+                                ErrorMessages::FailedToReadObjectAtField,
+                                "Archive members", "members", "array")
+        .build();
+  }
+
+  auto &Members = getMembers(A);
+  const auto &ArchiveTriple = getTargetTriple(A);
+
+  for (const auto &[Index, MemberValue] : llvm::enumerate(*MembersArray)) {
+    const Object *MemberObject = MemberValue.getAsObject();
+    if (!MemberObject) {
+      return ErrorBuilder::create(std::errc::invalid_argument,
+                                  ErrorMessages::FailedToReadObjectAtIndex,
+                                  "Archive member", Index, "object")
+          .build();
+    }
+
+    if (auto Err = checkSummaryType(*MemberObject, JSONTypeValueTUSummary)) {
+      return ErrorBuilder::wrap(std::move(Err))
+          .context(ErrorMessages::ReadingFromIndex, "Archive member", Index)
+          .build();
+    }
+
+    auto ExpectedMember = readTUSummaryEncodingFromObject(*MemberObject);
+    if (!ExpectedMember) {
+      return ErrorBuilder::wrap(ExpectedMember.takeError())
+          .context(ErrorMessages::ReadingFromIndex, "Archive member", Index)
+          .build();
+    }
+
+    if (ExpectedMember->getTargetTriple() != ArchiveTriple) {
+      return ErrorBuilder::create(std::errc::invalid_argument,
+                                  ErrorMessages::MismatchedSummaryType,
+                                  llvm::Triple::normalize(ArchiveTriple.str()),
+                                  "target_triple",
+                                  llvm::Triple::normalize(
+                                      ExpectedMember->getTargetTriple().str()))
+          .context(ErrorMessages::ReadingFromIndex, "Archive member", Index)
+          .build();
+    }
+
+    auto MemberNamespace = getTUNamespace(*ExpectedMember);
+    auto Owned =
+        std::make_unique<TUSummaryEncoding>(std::move(*ExpectedMember));
+    auto [It, Inserted] = Members.insert(std::move(Owned));
+    if (!Inserted) {
+      return ErrorBuilder::create(std::errc::invalid_argument,
+                                  ErrorMessages::FailedInsertionOnDuplication,
+                                  "Archive member", Index, MemberNamespace)
+          .build();
+    }
+  }
+
+  return std::move(A);
+}
+
+llvm::Error JSONFormat::writeArchive(const Archive &A, llvm::StringRef Path) {
+  Object RootObject;
+
+  RootObject[JSONTypeKey] = JSONTypeValueArchive;
+
+  RootObject["target_triple"] =
+      llvm::Triple::normalize(getTargetTriple(A).str());
+
+  RootObject["namespace"] = buildNamespaceToJSON(getNamespace(A));
+
+  Array MembersArray;
+  MembersArray.reserve(getMembers(A).size());
+  for (const auto &Member : getMembers(A)) {
+    MembersArray.push_back(tuSummaryEncodingToJSON(*Member));
+  }
+  RootObject["members"] = std::move(MembersArray);
+
+  if (auto Error = writeJSON(std::move(RootObject), Path)) {
+    return ErrorBuilder::wrap(std::move(Error))
+        .context(ErrorMessages::WritingToFile, "Archive", Path)
+        .build();
+  }
+
+  return llvm::Error::success();
+}
+
+} // namespace clang::ssaf
diff --git 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Artifact.cpp 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Artifact.cpp
index 424d7368cf33f..b112c899c28fa 100644
--- 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Artifact.cpp
+++ 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/Artifact.cpp
@@ -145,10 +145,21 @@ JSONFormat::readArtifactEncoding(llvm::StringRef Path) {
     return ArtifactEncoding{std::move(*ExpectedLU)};
   }
 
+  if (*ExpectedType == JSONTypeValueArchive) {
+    auto ExpectedArchive = readArchiveFromObject(*RootObjectPtr);
+    if (!ExpectedArchive) {
+      return ErrorBuilder::wrap(ExpectedArchive.takeError())
+          .context(ErrorMessages::ReadingFromFile, "ArtifactEncoding", Path)
+          .build();
+    }
+    return ArtifactEncoding{std::move(*ExpectedArchive)};
+  }
+
   return ErrorBuilder::create(std::errc::invalid_argument,
                               ErrorMessages::UnknownArtifactEncodingType,
                               *ExpectedType, JSONTypeKey,
-                              JSONTypeValueTUSummary, JSONTypeValueLUSummary)
+                              JSONTypeValueTUSummary, JSONTypeValueLUSummary,
+                              JSONTypeValueArchive)
       .context(ErrorMessages::ReadingFromFile, "ArtifactEncoding", Path)
       .build();
 }
@@ -160,11 +171,13 @@ llvm::Error JSONFormat::writeArtifactEncoding(const 
ArtifactEncoding &E,
         using T = std::decay_t<decltype(Enc)>;
         if constexpr (std::is_same_v<T, TUSummaryEncoding>) {
           return writeTUSummaryEncoding(Enc, Path);
+        } else if constexpr (std::is_same_v<T, LUSummaryEncoding>) {
+          return writeLUSummaryEncoding(Enc, Path);
         } else {
           static_assert(
-              std::is_same_v<T, LUSummaryEncoding>,
+              std::is_same_v<T, Archive>,
               "ArtifactEncoding visitor must cover all variant alternatives");
-          return writeLUSummaryEncoding(Enc, Path);
+          return writeArchive(Enc, Path);
         }
       },
       E);
diff --git 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.h
 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.h
index 191be83ccb0e5..29048f8991a5b 100644
--- 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.h
+++ 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.h
@@ -85,7 +85,7 @@ inline constexpr const char *MismatchedSummaryType =
 inline constexpr const char *UnknownArtifactType =
     "unknown value '{0}' for field '{1}': expected '{2}', '{3}', or '{4}'";
 inline constexpr const char *UnknownArtifactEncodingType =
-    "unknown value '{0}' for field '{1}': expected '{2}', or '{3}'";
+    "unknown value '{0}' for field '{1}': expected '{2}', '{3}', or '{4}'";
 
 inline constexpr const char *FailedToDeserializeEntitySummaryNoFormatInfo =
     "failed to deserialize EntitySummary: no FormatInfo registered for '{0}'";
@@ -149,6 +149,9 @@ inline constexpr const char *JSONTypeValueTUSummary = 
"TUSummary";
 /// Value written to \c JSONTypeKey for serialized \c LUSummary files.
 inline constexpr const char *JSONTypeValueLUSummary = "LUSummary";
 
+/// Value written to \c JSONTypeKey for serialized \c Archive files.
+inline constexpr const char *JSONTypeValueArchive = "Archive";
+
 /// Value written to \c JSONTypeKey for serialized \c WPASuite files.
 inline constexpr const char *JSONTypeValueWPASuite = "WPASuite";
 
diff --git 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/TUSummaryEncoding.cpp
 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/TUSummaryEncoding.cpp
index 5a5ab98731c47..3ee4f059bd458 100644
--- 
a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/TUSummaryEncoding.cpp
+++ 
b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/TUSummaryEncoding.cpp
@@ -164,6 +164,17 @@ JSONFormat::readTUSummaryEncodingFromObject(const Object 
&RootObject) {
 llvm::Error
 JSONFormat::writeTUSummaryEncoding(const TUSummaryEncoding &SummaryEncoding,
                                    llvm::StringRef Path) {
+  if (auto Error = writeJSON(tuSummaryEncodingToJSON(SummaryEncoding), Path)) {
+    return ErrorBuilder::wrap(std::move(Error))
+        .context(ErrorMessages::WritingToFile, "TUSummary", Path)
+        .build();
+  }
+
+  return llvm::Error::success();
+}
+
+Object JSONFormat::tuSummaryEncodingToJSON(
+    const TUSummaryEncoding &SummaryEncoding) const {
   Object RootObject;
 
   RootObject[JSONTypeKey] = JSONTypeValueTUSummary;
@@ -181,13 +192,7 @@ JSONFormat::writeTUSummaryEncoding(const TUSummaryEncoding 
&SummaryEncoding,
 
   RootObject["data"] = encodingSummaryDataMapToJSON(getData(SummaryEncoding));
 
-  if (auto Error = writeJSON(std::move(RootObject), Path)) {
-    return ErrorBuilder::wrap(std::move(Error))
-        .context(ErrorMessages::WritingToFile, "TUSummary", Path)
-        .build();
-  }
-
-  return llvm::Error::success();
+  return RootObject;
 }
 
 } // namespace clang::ssaf
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/duplicate-member.json 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/duplicate-member.json
new file mode 100644
index 0000000000000..e2a9b8bc9c04b
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/duplicate-member.json
@@ -0,0 +1,32 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": [
+    {
+      "type": "TUSummary",
+      "target_triple": "arm64-apple-macosx",
+      "tu_namespace": {
+        "kind": "CompilationUnit",
+        "name": "a.cpp"
+      },
+      "id_table": [],
+      "linkage_table": [],
+      "data": []
+    },
+    {
+      "type": "TUSummary",
+      "target_triple": "arm64-apple-macosx",
+      "tu_namespace": {
+        "kind": "CompilationUnit",
+        "name": "a.cpp"
+      },
+      "id_table": [],
+      "linkage_table": [],
+      "data": []
+    }
+  ]
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-mismatched-type.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-mismatched-type.json
new file mode 100644
index 0000000000000..7ab312e5c3c51
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-mismatched-type.json
@@ -0,0 +1,18 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": [
+    {
+      "type": "LUSummary",
+      "target_triple": "arm64-apple-macosx",
+      "lu_namespace": [],
+      "id_table": [],
+      "linkage_table": [],
+      "data": []
+    }
+  ]
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-not-object.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-not-object.json
new file mode 100644
index 0000000000000..a479b8e560462
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-not-object.json
@@ -0,0 +1,9 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": ["not an object"]
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-triple-mismatch.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-triple-mismatch.json
new file mode 100644
index 0000000000000..2690bab465d44
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/member-triple-mismatch.json
@@ -0,0 +1,21 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": [
+    {
+      "type": "TUSummary",
+      "target_triple": "x86_64-apple-macosx",
+      "tu_namespace": {
+        "kind": "CompilationUnit",
+        "name": "a.cpp"
+      },
+      "id_table": [],
+      "linkage_table": [],
+      "data": []
+    }
+  ]
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/members-not-array.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/members-not-array.json
new file mode 100644
index 0000000000000..4bf99cf057afd
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/members-not-array.json
@@ -0,0 +1,9 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": {}
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/mismatched-type.json 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/mismatched-type.json
new file mode 100644
index 0000000000000..df066e9289767
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/mismatched-type.json
@@ -0,0 +1,9 @@
+{
+  "type": "TUSummary",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-members.json 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-members.json
new file mode 100644
index 0000000000000..d8a927747b5a0
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-members.json
@@ -0,0 +1,8 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  }
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-namespace.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-namespace.json
new file mode 100644
index 0000000000000..39d998d19753c
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-namespace.json
@@ -0,0 +1,5 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-target-triple.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-target-triple.json
new file mode 100644
index 0000000000000..870d44de13aa4
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-target-triple.json
@@ -0,0 +1,8 @@
+{
+  "type": "Archive",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-type.json 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-type.json
new file mode 100644
index 0000000000000..e1314fc1dd796
--- /dev/null
+++ b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/missing-type.json
@@ -0,0 +1,8 @@
+{
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-invalid-kind.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-invalid-kind.json
new file mode 100644
index 0000000000000..bdcc067d17fc8
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-invalid-kind.json
@@ -0,0 +1,9 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "invalid_kind",
+    "name": "libfoo"
+  },
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-missing-kind.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-missing-kind.json
new file mode 100644
index 0000000000000..28f3322831d6f
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-missing-kind.json
@@ -0,0 +1,8 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "name": "libfoo"
+  },
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-missing-name.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-missing-name.json
new file mode 100644
index 0000000000000..5f87b3e4662df
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-missing-name.json
@@ -0,0 +1,8 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "Archive"
+  },
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-wrong-kind.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-wrong-kind.json
new file mode 100644
index 0000000000000..24c437fc61dd5
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/namespace-wrong-kind.json
@@ -0,0 +1,9 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-apple-macosx",
+  "namespace": {
+    "kind": "CompilationUnit",
+    "name": "libfoo"
+  },
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/not-normalized-target-triple.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/not-normalized-target-triple.json
new file mode 100644
index 0000000000000..637d42cd32be8
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/not-normalized-target-triple.json
@@ -0,0 +1,9 @@
+{
+  "type": "Archive",
+  "target_triple": "arm64-macosx-apple",
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "members": []
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-empty.json 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-empty.json
new file mode 100644
index 0000000000000..79513109e8c5d
--- /dev/null
+++ b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-empty.json
@@ -0,0 +1,9 @@
+{
+  "members": [],
+  "namespace": {
+    "kind": "Archive",
+    "name": "libempty"
+  },
+  "target_triple": "arm64-apple-macosx",
+  "type": "Archive"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-multiple-members.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-multiple-members.json
new file mode 100644
index 0000000000000..b8210a19216bd
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-multiple-members.json
@@ -0,0 +1,43 @@
+{
+  "members": [
+    {
+      "data": [],
+      "id_table": [],
+      "linkage_table": [],
+      "target_triple": "arm64-apple-macosx",
+      "tu_namespace": {
+        "kind": "CompilationUnit",
+        "name": "a.cpp"
+      },
+      "type": "TUSummary"
+    },
+    {
+      "data": [],
+      "id_table": [],
+      "linkage_table": [],
+      "target_triple": "arm64-apple-macosx",
+      "tu_namespace": {
+        "kind": "CompilationUnit",
+        "name": "b.cpp"
+      },
+      "type": "TUSummary"
+    },
+    {
+      "data": [],
+      "id_table": [],
+      "linkage_table": [],
+      "target_triple": "arm64-apple-macosx",
+      "tu_namespace": {
+        "kind": "CompilationUnit",
+        "name": "c.cpp"
+      },
+      "type": "TUSummary"
+    }
+  ],
+  "namespace": {
+    "kind": "Archive",
+    "name": "libmulti"
+  },
+  "target_triple": "arm64-apple-macosx",
+  "type": "Archive"
+}
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-single-member.json 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-single-member.json
new file mode 100644
index 0000000000000..0eab8a9cdb0b6
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/Inputs/rt-single-member.json
@@ -0,0 +1,21 @@
+{
+  "members": [
+    {
+      "data": [],
+      "id_table": [],
+      "linkage_table": [],
+      "target_triple": "arm64-apple-macosx",
+      "tu_namespace": {
+        "kind": "CompilationUnit",
+        "name": "a.cpp"
+      },
+      "type": "TUSummary"
+    }
+  ],
+  "namespace": {
+    "kind": "Archive",
+    "name": "libfoo"
+  },
+  "target_triple": "arm64-apple-macosx",
+  "type": "Archive"
+}
diff --git a/clang/test/Analysis/Scalable/ssaf-format/Archive/round-trip.test 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/round-trip.test
new file mode 100644
index 0000000000000..b3273abfc3238
--- /dev/null
+++ b/clang/test/Analysis/Scalable/ssaf-format/Archive/round-trip.test
@@ -0,0 +1,27 @@
+// Round-trip tests: read an Archive JSON input, write it back out, and
+// diff the result against the original.
+//
+// Archive has only an encoding representation, so --encoding is a no-op
+// for --type archive and both invocations must produce the same output.
+
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+
+// ============================================================================
+// Round-Trip Tests
+// ============================================================================
+
+// RUN: clang-ssaf-format --type archive %S/Inputs/rt-empty.json -o 
%t/rt-empty.json
+// RUN: diff %S/Inputs/rt-empty.json %t/rt-empty.json
+// RUN: clang-ssaf-format --type archive --encoding %S/Inputs/rt-empty.json -o 
%t/rt-empty-enc.json
+// RUN: diff %S/Inputs/rt-empty.json %t/rt-empty-enc.json
+
+// RUN: clang-ssaf-format --type archive %S/Inputs/rt-single-member.json -o 
%t/rt-single-member.json
+// RUN: diff %S/Inputs/rt-single-member.json %t/rt-single-member.json
+// RUN: clang-ssaf-format --type archive --encoding 
%S/Inputs/rt-single-member.json -o %t/rt-single-member-enc.json
+// RUN: diff %S/Inputs/rt-single-member.json %t/rt-single-member-enc.json
+
+// RUN: clang-ssaf-format --type archive %S/Inputs/rt-multiple-members.json -o 
%t/rt-multiple-members.json
+// RUN: diff %S/Inputs/rt-multiple-members.json %t/rt-multiple-members.json
+// RUN: clang-ssaf-format --type archive --encoding 
%S/Inputs/rt-multiple-members.json -o %t/rt-multiple-members-enc.json
+// RUN: diff %S/Inputs/rt-multiple-members.json %t/rt-multiple-members-enc.json
diff --git a/clang/test/Analysis/Scalable/ssaf-format/Archive/top-level.test 
b/clang/test/Analysis/Scalable/ssaf-format/Archive/top-level.test
new file mode 100644
index 0000000000000..0746cd72ac8f5
--- /dev/null
+++ b/clang/test/Analysis/Scalable/ssaf-format/Archive/top-level.test
@@ -0,0 +1,107 @@
+// Top-level Archive structure tests: target_triple, namespace (Archive
+// kind), members array, and per-member validation. Mirrors the LUSummary
+// top-level test pattern but covers the Archive-specific shape.
+
+// ============================================================================
+// readArchive() / writeArchive() type-field errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type archive %S/Inputs/missing-type.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MISSING-TYPE
+// MISSING-TYPE:      clang-ssaf-format: error: reading Archive from file 
'{{.*}}missing-type.json'
+// MISSING-TYPE-NEXT: failed to read summary type from field 'type': expected 
JSON string
+
+// RUN: not clang-ssaf-format --type archive %S/Inputs/mismatched-type.json 
2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MISMATCHED-TYPE
+// MISMATCHED-TYPE:      clang-ssaf-format: error: reading Archive from file 
'{{.*}}mismatched-type.json'
+// MISMATCHED-TYPE-NEXT: expected 'Archive' for field 'type' but got 
'TUSummary'
+
+// ============================================================================
+// target_triple errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type archive 
%S/Inputs/missing-target-triple.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=MISSING-TARGET-TRIPLE
+// MISSING-TARGET-TRIPLE:      clang-ssaf-format: error: reading Archive from 
file '{{.*}}missing-target-triple.json'
+// MISSING-TARGET-TRIPLE-NEXT: failed to read TargetTriple from field 
'target_triple': expected JSON string
+
+// RUN: not clang-ssaf-format --type archive 
%S/Inputs/not-normalized-target-triple.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=NOT-NORMALIZED-TARGET-TRIPLE
+// NOT-NORMALIZED-TARGET-TRIPLE:      clang-ssaf-format: error: reading 
Archive from file '{{.*}}not-normalized-target-triple.json'
+// NOT-NORMALIZED-TARGET-TRIPLE-NEXT: reading TargetTriple from field 
'target_triple'
+// NOT-NORMALIZED-TARGET-TRIPLE-NEXT: target triple 'arm64-macosx-apple' is 
not in normalized form (expected 'arm64-apple-macosx')
+
+// ============================================================================
+// namespace errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type archive %S/Inputs/missing-namespace.json 
2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MISSING-NAMESPACE
+// MISSING-NAMESPACE:      clang-ssaf-format: error: reading Archive from file 
'{{.*}}missing-namespace.json'
+// MISSING-NAMESPACE-NEXT: failed to read BuildNamespace from field 
'namespace': expected JSON object
+
+// RUN: not clang-ssaf-format --type archive 
%S/Inputs/namespace-missing-kind.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=NAMESPACE-MISSING-KIND
+// NAMESPACE-MISSING-KIND:      clang-ssaf-format: error: reading Archive from 
file '{{.*}}namespace-missing-kind.json'
+// NAMESPACE-MISSING-KIND-NEXT: reading BuildNamespace from field 'namespace'
+// NAMESPACE-MISSING-KIND-NEXT: failed to read BuildNamespaceKind from field 
'kind': expected JSON string
+
+// RUN: not clang-ssaf-format --type archive 
%S/Inputs/namespace-invalid-kind.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=NAMESPACE-INVALID-KIND
+// NAMESPACE-INVALID-KIND:      clang-ssaf-format: error: reading Archive from 
file '{{.*}}namespace-invalid-kind.json'
+// NAMESPACE-INVALID-KIND-NEXT: reading BuildNamespace from field 'namespace'
+// NAMESPACE-INVALID-KIND-NEXT: reading BuildNamespaceKind from field 'kind'
+// NAMESPACE-INVALID-KIND-NEXT: invalid BuildNamespaceKind value 
'invalid_kind' for field 'kind'
+
+// Archive's namespace field must specifically have kind=Archive. Any other
+// well-formed kind (CompilationUnit, LinkUnit) is reported as a mismatch.
+// RUN: not clang-ssaf-format --type archive 
%S/Inputs/namespace-wrong-kind.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=NAMESPACE-WRONG-KIND
+// NAMESPACE-WRONG-KIND:      clang-ssaf-format: error: reading Archive from 
file '{{.*}}namespace-wrong-kind.json'
+// NAMESPACE-WRONG-KIND-NEXT: expected 'Archive' for field 'namespace.kind' 
but got 'CompilationUnit'
+
+// RUN: not clang-ssaf-format --type archive 
%S/Inputs/namespace-missing-name.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=NAMESPACE-MISSING-NAME
+// NAMESPACE-MISSING-NAME:      clang-ssaf-format: error: reading Archive from 
file '{{.*}}namespace-missing-name.json'
+// NAMESPACE-MISSING-NAME-NEXT: reading BuildNamespace from field 'namespace'
+// NAMESPACE-MISSING-NAME-NEXT: failed to read BuildNamespaceName from field 
'name': expected JSON string
+
+// ============================================================================
+// members array errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type archive %S/Inputs/missing-members.json 
2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MISSING-MEMBERS
+// MISSING-MEMBERS:      clang-ssaf-format: error: reading Archive from file 
'{{.*}}missing-members.json'
+// MISSING-MEMBERS-NEXT: failed to read Archive members from field 'members': 
expected JSON array
+
+// RUN: not clang-ssaf-format --type archive %S/Inputs/members-not-array.json 
2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MEMBERS-NOT-ARRAY
+// MEMBERS-NOT-ARRAY:      clang-ssaf-format: error: reading Archive from file 
'{{.*}}members-not-array.json'
+// MEMBERS-NOT-ARRAY-NEXT: failed to read Archive members from field 
'members': expected JSON array
+
+// RUN: not clang-ssaf-format --type archive %S/Inputs/member-not-object.json 
2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=MEMBER-NOT-OBJECT
+// MEMBER-NOT-OBJECT:      clang-ssaf-format: error: reading Archive from file 
'{{.*}}member-not-object.json'
+// MEMBER-NOT-OBJECT-NEXT: failed to read Archive member from index '0': 
expected JSON object
+
+// ============================================================================
+// per-member errors
+// ============================================================================
+
+// RUN: not clang-ssaf-format --type archive 
%S/Inputs/member-mismatched-type.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=MEMBER-MISMATCHED-TYPE
+// MEMBER-MISMATCHED-TYPE:      clang-ssaf-format: error: reading Archive from 
file '{{.*}}member-mismatched-type.json'
+// MEMBER-MISMATCHED-TYPE-NEXT: reading Archive member from index '0'
+// MEMBER-MISMATCHED-TYPE-NEXT: expected 'TUSummary' for field 'type' but got 
'LUSummary'
+
+// RUN: not clang-ssaf-format --type archive 
%S/Inputs/member-triple-mismatch.json 2>&1 \
+// RUN:   | FileCheck %s --match-full-lines 
--check-prefix=MEMBER-TRIPLE-MISMATCH
+// MEMBER-TRIPLE-MISMATCH:      clang-ssaf-format: error: reading Archive from 
file '{{.*}}member-triple-mismatch.json'
+// MEMBER-TRIPLE-MISMATCH-NEXT: reading Archive member from index '0'
+// MEMBER-TRIPLE-MISMATCH-NEXT: expected 'arm64-apple-macosx' for field 
'target_triple' but got 'x86_64-apple-macosx'
+
+// RUN: not clang-ssaf-format --type archive %S/Inputs/duplicate-member.json 
2>&1 \
+// RUN:   | FileCheck %s --match-full-lines --check-prefix=DUPLICATE-MEMBER
+// DUPLICATE-MEMBER:      clang-ssaf-format: error: reading Archive from file 
'{{.*}}duplicate-member.json'
+// DUPLICATE-MEMBER-NEXT: failed to insert Archive member at index '1': 
encountered duplicate 'BuildNamespace(CompilationUnit, a.cpp)'
diff --git 
a/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-archive-empty.json
 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-archive-empty.json
new file mode 100644
index 0000000000000..79513109e8c5d
--- /dev/null
+++ 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/Inputs/rt-archive-empty.json
@@ -0,0 +1,9 @@
+{
+  "members": [],
+  "namespace": {
+    "kind": "Archive",
+    "name": "libempty"
+  },
+  "target_triple": "arm64-apple-macosx",
+  "type": "Archive"
+}
diff --git a/clang/test/Analysis/Scalable/ssaf-format/Artifact/round-trip.test 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/round-trip.test
index 4ddb233940afe..dc7a88a634d7a 100644
--- a/clang/test/Analysis/Scalable/ssaf-format/Artifact/round-trip.test
+++ b/clang/test/Analysis/Scalable/ssaf-format/Artifact/round-trip.test
@@ -38,3 +38,12 @@
 // RUN: diff %S/Inputs/rt-lu-empty.json %t/rt-lu-empty-enc.json
 // RUN: clang-ssaf-format --type auto --encoding %S/Inputs/rt-lu-empty.json -o 
%t/rt-lu-empty-enc-explicit.json
 // RUN: diff %S/Inputs/rt-lu-empty.json %t/rt-lu-empty-enc-explicit.json
+
+// Archive appears only in the ArtifactEncoding variant (the archive tool
+// and the linker pass member payloads through encoded), so it round-trips
+// only via --encoding here.
+
+// RUN: clang-ssaf-format --encoding %S/Inputs/rt-archive-empty.json -o 
%t/rt-archive-empty-enc.json
+// RUN: diff %S/Inputs/rt-archive-empty.json %t/rt-archive-empty-enc.json
+// RUN: clang-ssaf-format --type auto --encoding 
%S/Inputs/rt-archive-empty.json -o %t/rt-archive-empty-enc-explicit.json
+// RUN: diff %S/Inputs/rt-archive-empty.json 
%t/rt-archive-empty-enc-explicit.json
diff --git a/clang/test/Analysis/Scalable/ssaf-format/Artifact/top-level.test 
b/clang/test/Analysis/Scalable/ssaf-format/Artifact/top-level.test
index 904b1dffa7d7b..97e45ee54b41e 100644
--- a/clang/test/Analysis/Scalable/ssaf-format/Artifact/top-level.test
+++ b/clang/test/Analysis/Scalable/ssaf-format/Artifact/top-level.test
@@ -40,4 +40,4 @@
 // RUN: not clang-ssaf-format --type auto --encoding 
%S/Inputs/unknown-type.json 2>&1 \
 // RUN:   | FileCheck %s --match-full-lines 
--check-prefix=ENCODING-UNKNOWN-TYPE
 // ENCODING-UNKNOWN-TYPE:      clang-ssaf-format: error: reading 
ArtifactEncoding from file '{{.*}}unknown-type.json'
-// ENCODING-UNKNOWN-TYPE-NEXT: unknown value 'Mystery' for field 'type': 
expected 'TUSummary', or 'LUSummary'
+// ENCODING-UNKNOWN-TYPE-NEXT: unknown value 'Mystery' for field 'type': 
expected 'TUSummary', 'LUSummary', or 'Archive'
diff --git a/clang/tools/clang-ssaf-format/SSAFFormat.cpp 
b/clang/tools/clang-ssaf-format/SSAFFormat.cpp
index 9416b45c974b5..a9cacd5f769eb 100644
--- a/clang/tools/clang-ssaf-format/SSAFFormat.cpp
+++ b/clang/tools/clang-ssaf-format/SSAFFormat.cpp
@@ -11,6 +11,7 @@
 //
 
//===----------------------------------------------------------------------===//
 
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/Serialization/JSONFormat.h"
@@ -39,7 +40,7 @@ namespace {
 // Summary Type
 
//===----------------------------------------------------------------------===//
 
-enum class SummaryType { Auto, TU, LU, WPA };
+enum class SummaryType { Auto, TU, LU, Archive, WPA };
 
 
//===----------------------------------------------------------------------===//
 // Command-Line Options
@@ -63,6 +64,8 @@ cl::opt<SummaryType> Type(
                           "Detect type from the file's 'type' field"),
                clEnumValN(SummaryType::TU, "tu", "Translation unit summary"),
                clEnumValN(SummaryType::LU, "lu", "Link unit summary"),
+               clEnumValN(SummaryType::Archive, "archive",
+                          "Archive of translation unit summaries"),
                clEnumValN(SummaryType::WPA, "wpa",
                           "Whole-program analysis suite")),
     cl::init(SummaryType::Auto), cl::cat(SsafFormatCategory));
@@ -295,6 +298,12 @@ void convert(const FormatInput &FI) {
           &SerializationFormat::writeLUSummary);
     }
     return;
+  case SummaryType::Archive:
+    // Archive has only an encoded representation, so --encoding is a no-op
+    // here: both paths route to readArchive / writeArchive.
+    run(FI, &SerializationFormat::readArchive,
+        &SerializationFormat::writeArchive);
+    return;
   case SummaryType::WPA:
     run(FI, &SerializationFormat::readWPASuite,
         &SerializationFormat::writeWPASuite);
diff --git a/clang/unittests/ScalableStaticAnalysis/ArchiveTest.cpp 
b/clang/unittests/ScalableStaticAnalysis/ArchiveTest.cpp
new file mode 100644
index 0000000000000..37e2bf3fae765
--- /dev/null
+++ b/clang/unittests/ScalableStaticAnalysis/ArchiveTest.cpp
@@ -0,0 +1,32 @@
+//===- ArchiveTest.cpp 
----------------------------------------------------===//
+//
+// 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/ScalableStaticAnalysis/Core/EntityLinker/Archive.h"
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
+#include "clang/ScalableStaticAnalysis/Core/Model/BuildNamespace.h"
+#include "gtest/gtest.h"
+
+namespace clang::ssaf {
+namespace {
+
+TEST(ArchiveTest, GetNamespace) {
+  BuildNamespace BN(BuildNamespaceKind::Archive, "libfoo");
+  Archive A(llvm::Triple("arm64-apple-macosx"), BN);
+
+  EXPECT_EQ(A.getNamespace(), BN);
+}
+
+TEST(ArchiveTest, GetTargetTriple) {
+  llvm::Triple T("arm64-apple-macosx");
+  Archive A(T, BuildNamespace(BuildNamespaceKind::Archive, "libfoo"));
+
+  EXPECT_EQ(A.getTargetTriple(), T);
+}
+
+} // namespace
+} // namespace clang::ssaf
diff --git a/clang/unittests/ScalableStaticAnalysis/BuildNamespaceTest.cpp 
b/clang/unittests/ScalableStaticAnalysis/BuildNamespaceTest.cpp
index e98efd45ea6b0..7910ace07c3bb 100644
--- a/clang/unittests/ScalableStaticAnalysis/BuildNamespaceTest.cpp
+++ b/clang/unittests/ScalableStaticAnalysis/BuildNamespaceTest.cpp
@@ -83,6 +83,7 @@ TEST(BuildNamespaceKindTest, FormatProvider) {
             "CompilationUnit");
   EXPECT_EQ(llvm::formatv("{0}", BuildNamespaceKind::LinkUnit).str(),
             "LinkUnit");
+  EXPECT_EQ(llvm::formatv("{0}", BuildNamespaceKind::Archive).str(), 
"Archive");
 }
 
 TEST(BuildNamespaceKindTest, StreamOutputCompilationUnit) {
@@ -97,6 +98,12 @@ TEST(BuildNamespaceKindTest, StreamOutputLinkUnit) {
   EXPECT_EQ(S, "LinkUnit");
 }
 
+TEST(BuildNamespaceKindTest, StreamOutputArchive) {
+  std::string S;
+  llvm::raw_string_ostream(S) << BuildNamespaceKind::Archive;
+  EXPECT_EQ(S, "Archive");
+}
+
 TEST(BuildNamespaceTest, FormatProvider) {
   EXPECT_EQ(
       llvm::formatv("{0}", BuildNamespace(BuildNamespaceKind::CompilationUnit,
diff --git a/clang/unittests/ScalableStaticAnalysis/CMakeLists.txt 
b/clang/unittests/ScalableStaticAnalysis/CMakeLists.txt
index 387f03dc76fc6..a095434f14d54 100644
--- a/clang/unittests/ScalableStaticAnalysis/CMakeLists.txt
+++ b/clang/unittests/ScalableStaticAnalysis/CMakeLists.txt
@@ -4,6 +4,7 @@ add_distinct_clang_unittest(ClangScalableAnalysisTests
   Analyses/CallGraph/CallGraphExtractorTest.cpp
   Analyses/UnsafeBufferUsage/UnsafeBufferUsageTest.cpp
   Analyses/UnsafeBufferUsage/UnsafeBufferUsageWPATest.cpp
+  ArchiveTest.cpp
   ASTEntityMappingTest.cpp
   BuildNamespaceTest.cpp
   EntityIdTableTest.cpp
diff --git 
a/clang/unittests/ScalableStaticAnalysis/Frontend/TUSummaryExtractorFrontendActionTest.cpp
 
b/clang/unittests/ScalableStaticAnalysis/Frontend/TUSummaryExtractorFrontendActionTest.cpp
index 2d65fb675eec3..8bf194af05930 100644
--- 
a/clang/unittests/ScalableStaticAnalysis/Frontend/TUSummaryExtractorFrontendActionTest.cpp
+++ 
b/clang/unittests/ScalableStaticAnalysis/Frontend/TUSummaryExtractorFrontendActionTest.cpp
@@ -98,6 +98,14 @@ class FailingSerializationFormat final : public 
SerializationFormat {
     return failing("writeLUSummaryEncoding");
   }
 
+  llvm::Expected<Archive> readArchive(llvm::StringRef Path) override {
+    return failing("readArchive");
+  }
+
+  llvm::Error writeArchive(const Archive &A, llvm::StringRef Path) override {
+    return failing("writeArchive");
+  }
+
   llvm::Expected<WPASuite> readWPASuite(llvm::StringRef Path) override {
     return failing("readWPASuite");
   }
@@ -179,6 +187,12 @@ class CapturingSerializationFormat final : public 
SerializationFormat {
                                      llvm::StringRef) override {
     return llvm::Error::success();
   }
+  llvm::Expected<Archive> readArchive(llvm::StringRef) override {
+    return llvm::createStringError("not implemented");
+  }
+  llvm::Error writeArchive(const Archive &, llvm::StringRef) override {
+    return llvm::Error::success();
+  }
   llvm::Expected<WPASuite> readWPASuite(llvm::StringRef) override {
     return llvm::createStringError("not implemented");
   }
diff --git 
a/clang/unittests/ScalableStaticAnalysis/ModelStringConversionsTest.cpp 
b/clang/unittests/ScalableStaticAnalysis/ModelStringConversionsTest.cpp
index ff24a8358612d..ffb40e25305a9 100644
--- a/clang/unittests/ScalableStaticAnalysis/ModelStringConversionsTest.cpp
+++ b/clang/unittests/ScalableStaticAnalysis/ModelStringConversionsTest.cpp
@@ -27,6 +27,10 @@ TEST(BuildNamespaceKindStringTest, ToStringLinkUnit) {
             "LinkUnit");
 }
 
+TEST(BuildNamespaceKindStringTest, ToStringArchive) {
+  EXPECT_EQ(buildNamespaceKindToString(BuildNamespaceKind::Archive), 
"Archive");
+}
+
 TEST(BuildNamespaceKindStringTest, FromStringCompilationUnit) {
   EXPECT_EQ(buildNamespaceKindFromString("CompilationUnit"),
             BuildNamespaceKind::CompilationUnit);
@@ -37,9 +41,15 @@ TEST(BuildNamespaceKindStringTest, FromStringLinkUnit) {
             BuildNamespaceKind::LinkUnit);
 }
 
+TEST(BuildNamespaceKindStringTest, FromStringArchive) {
+  EXPECT_EQ(buildNamespaceKindFromString("Archive"),
+            BuildNamespaceKind::Archive);
+}
+
 TEST(BuildNamespaceKindStringTest, FromStringUnknown) {
   EXPECT_EQ(buildNamespaceKindFromString("compilation_unit"), std::nullopt);
   EXPECT_EQ(buildNamespaceKindFromString("link_unit"), std::nullopt);
+  EXPECT_EQ(buildNamespaceKindFromString("archive"), std::nullopt);
   EXPECT_EQ(buildNamespaceKindFromString(""), std::nullopt);
   EXPECT_EQ(buildNamespaceKindFromString("unknown"), std::nullopt);
 }
@@ -51,6 +61,9 @@ TEST(BuildNamespaceKindStringTest, RoundTrip) {
   EXPECT_EQ(buildNamespaceKindFromString(
                 buildNamespaceKindToString(BuildNamespaceKind::LinkUnit)),
             BuildNamespaceKind::LinkUnit);
+  EXPECT_EQ(buildNamespaceKindFromString(
+                buildNamespaceKindToString(BuildNamespaceKind::Archive)),
+            BuildNamespaceKind::Archive);
 }
 
 
//===----------------------------------------------------------------------===//
diff --git 
a/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.cpp 
b/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.cpp
index 915fe15af832c..256ec19d3decb 100644
--- 
a/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.cpp
+++ 
b/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.cpp
@@ -7,6 +7,7 @@
 
//===----------------------------------------------------------------------===//
 
 #include "Registries/MockSerializationFormat.h"
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"
@@ -198,6 +199,16 @@ llvm::Error 
MockSerializationFormat::writeLUSummaryEncoding(
       "MockSerializationFormat does not support LUSummaryEncoding");
 }
 
+llvm::Expected<Archive>
+MockSerializationFormat::readArchive(llvm::StringRef Path) {
+  llvm_unreachable("MockSerializationFormat does not support Archive");
+}
+
+llvm::Error MockSerializationFormat::writeArchive(const Archive &A,
+                                                  llvm::StringRef Path) {
+  llvm_unreachable("MockSerializationFormat does not support Archive");
+}
+
 llvm::Expected<WPASuite>
 MockSerializationFormat::readWPASuite(llvm::StringRef Path) {
   llvm_unreachable("MockSerializationFormat does not support WPASuite");
diff --git 
a/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.h 
b/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.h
index 2ecaab9fb0132..fbfc482582e44 100644
--- 
a/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.h
+++ 
b/clang/unittests/ScalableStaticAnalysis/Registries/MockSerializationFormat.h
@@ -44,6 +44,10 @@ class MockSerializationFormat final : public 
SerializationFormat {
   llvm::Error writeLUSummaryEncoding(const LUSummaryEncoding &SummaryEncoding,
                                      llvm::StringRef Path) override;
 
+  llvm::Expected<Archive> readArchive(llvm::StringRef Path) override;
+
+  llvm::Error writeArchive(const Archive &A, llvm::StringRef Path) override;
+
   llvm::Expected<Artifact> readArtifact(llvm::StringRef Path) override;
 
   llvm::Error writeArtifact(const Artifact &A, llvm::StringRef Path) override;
diff --git a/clang/unittests/ScalableStaticAnalysis/TestFixture.h 
b/clang/unittests/ScalableStaticAnalysis/TestFixture.h
index 22fbff754fb37..8c769277c193e 100644
--- a/clang/unittests/ScalableStaticAnalysis/TestFixture.h
+++ b/clang/unittests/ScalableStaticAnalysis/TestFixture.h
@@ -9,6 +9,7 @@
 #ifndef LLVM_CLANG_UNITTESTS_SCALABLESTATICANALYSIS_TESTFIXTURE_H
 #define LLVM_CLANG_UNITTESTS_SCALABLESTATICANALYSIS_TESTFIXTURE_H
 
+#include "clang/ScalableStaticAnalysis/Core/EntityLinker/Archive.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummary.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/LUSummaryEncoding.h"
 #include "clang/ScalableStaticAnalysis/Core/EntityLinker/TUSummaryEncoding.h"

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