[Lldb-commits] [PATCH] D117623: [lldb] Print an error message when we're reading libobjc.A.dylib from memory

[Jonas Devlieghere via Phabricator via lldb-commits]

JDevlieghere updated this revision to Diff 401036.
JDevlieghere added a comment.

Update warning message


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D117623/new/

https://reviews.llvm.org/D117623

Files:
  lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
  lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h


Index: lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
===================================================================
--- lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
+++ lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.h
@@ -399,6 +399,7 @@
   };
 
   void WarnIfNoClassesCached(SharedCacheWarningReason reason);
+  void WarnIfNoExpandedSharedCache();
 
   lldb::addr_t GetSharedCacheReadOnlyAddress();
   lldb::addr_t GetSharedCacheBaseAddress();
Index: lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
===================================================================
--- lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -671,7 +671,7 @@
   static const ConstString g_objc_copyRealizedClassList(
       "_ZL33objc_copyRealizedClassList_nolockPj");
   m_has_objc_copyRealizedClassList = HasSymbol(g_objc_copyRealizedClassList);
-
+  WarnIfNoExpandedSharedCache();
   RegisterObjCExceptionRecognizer(process);
 }
 
@@ -2355,6 +2355,34 @@
   }
 }
 
+void AppleObjCRuntimeV2::WarnIfNoExpandedSharedCache() {
+#ifdef __APPLE__
+  if (!m_objc_module_sp)
+    return;
+
+  ObjectFile *object_file = m_objc_module_sp->GetObjectFile();
+  if (!object_file)
+    return;
+
+  if (!object_file->IsInMemory())
+    return;
+
+  Target &target = GetProcess()->GetTarget();
+  Debugger &debugger = target.GetDebugger();
+  if (auto stream = debugger.GetAsyncOutputStream()) {
+    const char *msg = "read from the shared cache";
+    if (PlatformSP platform_sp = target.GetPlatform())
+      msg = platform_sp->IsHost()
+                ? "read from the host's in-memory shared cache"
+                : "find the on-disk shared cache for this device";
+    stream->Printf("warning: libobjc.A.dylib is being read from process "
+                   "memory. This indicates that we could not %s. This will "
+                   "likely reduce debugging performance.\n",
+                   msg);
+  }
+#endif
+}
+
 DeclVendor *AppleObjCRuntimeV2::GetDeclVendor() {
   if (!m_decl_vendor_up)
     m_decl_vendor_up = std::make_unique<AppleObjCDeclVendor>(*this);


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