[ClangImporter] Use TextAPI apis for capturing current-version (#67204)

Use LLVM apis for understanding TBD files instead of parsing the yaml
directly. This prevents breaking the compiler when TBD-v5 exists which
is in json.

lib/ClangImporter/ClangImporter.cpp

@@ -77,7 +77,8 @@
 #include "llvm/Support/Path.h"
 #include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/VirtualOutputBackend.h"
-#include "llvm/Support/YAMLParser.h"
+#include "llvm/TextAPI/InterfaceFile.h"
+#include "llvm/TextAPI/TextAPIReader.h"
 #include <algorithm>
 #include <memory>
 #include <string>
@@ -1934,9 +1935,29 @@ bool ClangImporter::isModuleImported(const clang::Module *M) {
   return M->NameVisibility == clang::Module::NameVisibilityKind::AllVisible;
 }
 
-static std::string getScalaNodeText(llvm::yaml::Node *N) {
-  SmallString<32> Buffer;
-  return cast<llvm::yaml::ScalarNode>(N)->getValue(Buffer).str();
+static llvm::VersionTuple getCurrentVersionFromTBD(StringRef path,
+                                                   StringRef moduleName) {
+  std::string fwName = (moduleName + ".framework").str();
+  auto pos = path.find(fwName);
+  if (pos == StringRef::npos)
+    return {};
+  llvm::SmallString<256> buffer(path.substr(0, pos + fwName.size()));
+  llvm::sys::path::append(buffer, moduleName + ".tbd");
+  auto tbdPath = buffer.str();
+  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> tbdBufOrErr =
+      llvm::MemoryBuffer::getFile(tbdPath);
+  // .tbd file doesn't exist, exit.
+  if (!tbdBufOrErr)
+    return {};
+  auto tbdFileOrErr =
+      llvm::MachO::TextAPIReader::get(tbdBufOrErr.get()->getMemBufferRef());
+  if (auto err = tbdFileOrErr.takeError()) {
+    consumeError(std::move(err));
+    return {};
+  }
+  auto tbdCV = (*tbdFileOrErr)->getCurrentVersion();
+  return llvm::VersionTuple(tbdCV.getMajor(), tbdCV.getMinor(),
+                            tbdCV.getSubminor());
 }
 
 bool ClangImporter::canImportModule(ImportPath::Module modulePath,
@@ -1988,49 +2009,13 @@ bool ClangImporter::canImportModule(ImportPath::Module modulePath,
     return true;
 
   assert(available);
-  llvm::VersionTuple currentVersion;
   StringRef path = getClangASTContext().getSourceManager()
     .getFilename(clangModule->DefinitionLoc);
+
   // Look for the .tbd file inside .framework dir to get the project version
   // number.
-  std::string fwName = (llvm::Twine(topModule.Item.str()) + ".framework").str();
-  auto pos = path.find(fwName);
-  while (pos != StringRef::npos) {
-    llvm::SmallString<256> buffer(path.substr(0, pos + fwName.size()));
-    llvm::sys::path::append(buffer, llvm::Twine(topModule.Item.str()) + ".tbd");
-    auto tbdPath = buffer.str();
-    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> tbdBufOrErr =
-      llvm::MemoryBuffer::getFile(tbdPath);
-    // .tbd file doesn't exist, break.
-    if (!tbdBufOrErr) {
-      break;
-    }
-    StringRef tbdBuffer = tbdBufOrErr->get()->getBuffer();
-
-    // Use a new source manager instead of the one from ASTContext because we
-    // don't want the Json file to be persistent.
-    SourceManager SM;
-    llvm::yaml::Stream Stream(llvm::MemoryBufferRef(tbdBuffer, tbdPath),
-                              SM.getLLVMSourceMgr());
-    auto DI = Stream.begin();
-    assert(DI != Stream.end() && "Failed to read a document");
-    llvm::yaml::Node *N = DI->getRoot();
-    assert(N && "Failed to find a root");
-    auto *pairs = dyn_cast_or_null<llvm::yaml::MappingNode>(N);
-    if (!pairs)
-      break;
-    for (auto &keyValue: *pairs) {
-      auto key = getScalaNodeText(keyValue.getKey());
-      // Look for field "current-version" in the .tbd file.
-      if (key == "current-version") {
-        auto ver = getScalaNodeText(keyValue.getValue());
-        currentVersion.tryParse(ver);
-        break;
-      }
-    }
-    break;
-  }
-
+  llvm::VersionTuple currentVersion =
+      getCurrentVersionFromTBD(path, topModule.Item.str());
   versionInfo->setVersion(currentVersion,
                           ModuleVersionSourceKind::ClangModuleTBD);
   return true;

test/ClangImporter/Inputs/frameworks/Simple.framework/Simple.tbd

@@ -0,0 +1,8 @@
+--- !tapi-tbd
+tbd-version:     4
+targets:         [ arm64-macos, arm64-ios, arm64-watchos, arm64-tvos, 
+                   arm64-ios-simulator, arm64-watchos-simulator, arm64-tvos-simulator ]
+flags:           [ not_app_extension_safe ]
+install-name:    '/System/Library/Frameworks/Simple.framework/Versions/A/Simple'
+current-version: 1830.100
+...

test/ClangImporter/can_import_underlying_version.swift

@@ -3,9 +3,6 @@
 // RUN: %empty-directory(%t/frameworks)
 
 // RUN: cp -rf %S/Inputs/frameworks/Simple.framework %t/frameworks/
-
-// RUN: echo "current-version: 1830.100" > %t/frameworks/Simple.framework/Simple.tbd
-
 // RUN: %target-typecheck-verify-swift -disable-implicit-concurrency-module-import -F %t/frameworks
 
 import Simple

test/ClangImporter/can_import_underlying_version_ignores_swift_module_version.swift

@@ -11,7 +11,7 @@
 // conditional, the version in the `.tbd` should be honored. When `_version`
 // is specified, the version from the `.swiftmodule` should be honored.
 
-// RUN: echo "current-version: 3" > %t/frameworks/Simple.framework/Simple.tbd
+// RUN: sed -i -e "s/1830\.100/3/g" %t/frameworks/Simple.framework/Simple.tbd
 // RUN: echo "@_exported import Simple" > %t.overlay.swift
 // RUN: echo "public func additional() {}" >> %t.overlay.swift
 

test/ClangImporter/can_import_underlying_version_tbd_missing_version.swift

@@ -3,8 +3,7 @@
 // RUN: %empty-directory(%t/frameworks)
 
 // RUN: cp -rf %S/Inputs/frameworks/Simple.framework %t/frameworks/
-
-// RUN: echo "" > %t/frameworks/Simple.framework/Simple.tbd
+// RUN: rm -rf %t/frameworks/Simple.framework/Simple.tbd
 // RUN: %target-typecheck-verify-swift -disable-implicit-concurrency-module-import -F %t/frameworks
 
 import Simple

test/ClangImporter/can_import_version_ignores_missing_tbd_version.swift

@@ -12,7 +12,7 @@
 // should be no diagnostics and the version in the `.swiftmodule` should be
 // honored.
 
-// RUN: echo "" > %t/frameworks/Simple.framework/Simple.tbd
+// RUN: rm -rf %t/frameworks/Simple.framework/Simple.tbd
 // RUN: echo "@_exported import Simple" > %t.overlay.swift
 // RUN: echo "public func additional() {}" >> %t.overlay.swift