Kernel fileset live debugging support

lldb/include/lldb/Core/PluginManager.h

@@ -196,16 +196,20 @@ class PluginManager {
                          llvm::StringRef plugin_name);
 
   // ObjectContainer
-  static bool
-  RegisterPlugin(llvm::StringRef name, llvm::StringRef description,
-                 ObjectContainerCreateInstance create_callback,
-                 ObjectFileGetModuleSpecifications get_module_specifications);
+  static bool RegisterPlugin(
+      llvm::StringRef name, llvm::StringRef description,
+      ObjectContainerCreateInstance create_callback,
+      ObjectFileGetModuleSpecifications get_module_specifications,
+      ObjectContainerCreateMemoryInstance create_memory_callback = nullptr);
 
   static bool UnregisterPlugin(ObjectContainerCreateInstance create_callback);
 
   static ObjectContainerCreateInstance
   GetObjectContainerCreateCallbackAtIndex(uint32_t idx);
 
+  static ObjectContainerCreateMemoryInstance
+  GetObjectContainerCreateMemoryCallbackAtIndex(uint32_t idx);
+
   static ObjectFileGetModuleSpecifications
   GetObjectContainerGetModuleSpecificationsCallbackAtIndex(uint32_t idx);
 

lldb/include/lldb/Symbol/ObjectContainer.h

@@ -36,32 +36,14 @@ class ObjectContainer : public PluginInterface, public ModuleChild {
   /// more than one architecture or object.
   ObjectContainer(const lldb::ModuleSP &module_sp, const FileSpec *file,
                   lldb::offset_t file_offset, lldb::offset_t length,
-                  lldb::DataBufferSP &data_sp, lldb::offset_t data_offset)
-      : ModuleChild(module_sp),
-        m_file(), // This file can be different than the module's file spec
-        m_offset(file_offset), m_length(length) {
-    if (file)
-      m_file = *file;
-    if (data_sp)
-      m_data.SetData(data_sp, data_offset, length);
-  }
+                  lldb::DataBufferSP data_sp, lldb::offset_t data_offset);
 
   /// Destructor.
   ///
   /// The destructor is virtual since this class is designed to be inherited
   /// from by the plug-in instance.
   ~ObjectContainer() override = default;
 
-  /// Dump a description of this object to a Stream.
-  ///
-  /// Dump a description of the current contents of this object to the
-  /// supplied stream \a s. The dumping should include the section list if it
-  /// has been parsed, and the symbol table if it has been parsed.
-  ///
-  /// \param[in] s
-  ///     The stream to which to dump the object description.
-  virtual void Dump(Stream *s) const = 0;
-
   /// Gets the architecture given an index.
   ///
   /// Copies the architecture specification for index \a idx.
@@ -142,29 +124,23 @@ class ObjectContainer : public PluginInterface, public ModuleChild {
   ///     file exists in the container.
   virtual lldb::ObjectFileSP GetObjectFile(const FileSpec *file) = 0;
 
-  virtual bool ObjectAtIndexIsContainer(uint32_t object_idx) { return false; }
+  static lldb::ObjectContainerSP
+  FindPlugin(const lldb::ModuleSP &module_sp, const lldb::ProcessSP &process_sp,
+             lldb::addr_t header_addr, lldb::WritableDataBufferSP file_data_sp);
 
-  virtual ObjectFile *GetObjectFileAtIndex(uint32_t object_idx) {
-    return nullptr;
-  }
+protected:
+  /// The file that represents this container objects (which can be different
+  /// from the module's file).
+  FileSpec m_file;
 
-  virtual ObjectContainer *GetObjectContainerAtIndex(uint32_t object_idx) {
-    return nullptr;
-  }
+  /// The offset in bytes into the file, or the address in memory
+  lldb::addr_t m_offset;
 
-  virtual const char *GetObjectNameAtIndex(uint32_t object_idx) const {
-    return nullptr;
-  }
+  /// The size in bytes if known (can be zero).
+  lldb::addr_t m_length;
 
-protected:
-  // Member variables.
-  FileSpec m_file; ///< The file that represents this container objects (which
-                   ///can be different from the module's file).
-  lldb::addr_t
-      m_offset; ///< The offset in bytes into the file, or the address in memory
-  lldb::addr_t m_length; ///< The size in bytes if known (can be zero).
-  DataExtractor
-      m_data; ///< The data for this object file so things can be parsed lazily.
+  /// The data for this object file so things can be parsed lazily.
+  DataExtractor m_data;
 
 private:
   ObjectContainer(const ObjectContainer &) = delete;

lldb/include/lldb/Symbol/ObjectFile.h

@@ -738,6 +738,8 @@ class ObjectFile : public std::enable_shared_from_this<ObjectFile>,
   /// file when storing cached data.
   uint32_t GetCacheHash();
 
+  static lldb::DataBufferSP MapFileData(const FileSpec &file, uint64_t Size,
+                                        uint64_t Offset);
 
 protected:
   // Member variables.
@@ -778,9 +780,6 @@ class ObjectFile : public std::enable_shared_from_this<ObjectFile>,
   /// The number of bytes to read when going through the plugins.
   static size_t g_initial_bytes_to_read;
 
-  static lldb::DataBufferSP MapFileData(const FileSpec &file, uint64_t Size,
-                                        uint64_t Offset);
-
 private:
   ObjectFile(const ObjectFile &) = delete;
   const ObjectFile &operator=(const ObjectFile &) = delete;

lldb/include/lldb/Target/Platform.h

@@ -846,6 +846,34 @@ class Platform : public PluginInterface {
     return nullptr;
   }
 
+  /// Detect a binary in memory that will determine which Platform and
+  /// DynamicLoader should be used in this target/process, and update
+  /// the Platform/DynamicLoader.
+  /// The binary will be loaded into the Target, or will be registered with
+  /// the DynamicLoader so that it will be loaded at a later stage.  Returns
+  /// true to indicate that this is a platform binary and has been
+  /// loaded/registered, no further action should be taken by the caller.
+  ///
+  /// \param[in] process
+  ///     Process read memory from, a Process must be provided.
+  ///
+  /// \param[in] addr
+  ///     Address of a binary in memory.
+  ///
+  /// \param[in] notify
+  ///     Whether ModulesDidLoad should be called, if a binary is loaded.
+  ///     Caller may prefer to call ModulesDidLoad for multiple binaries
+  ///     that were loaded at the same time.
+  ///
+  /// \return
+  ///     Returns true if the binary was loaded in the target (or will be
+  ///     via a DynamicLoader).  Returns false if the binary was not
+  ///     loaded/registered, and the caller must load it into the target.
+  virtual bool LoadPlatformBinaryAndSetup(Process *process, lldb::addr_t addr,
+                                          bool notify) {
+    return false;
+  }
+
   virtual CompilerType GetSiginfoType(const llvm::Triple &triple);
 
   virtual Args GetExtraStartupCommands();
@@ -1026,6 +1054,32 @@ class PlatformList {
 
   lldb::PlatformSP Create(llvm::StringRef name);
 
+  /// Detect a binary in memory that will determine which Platform and
+  /// DynamicLoader should be used in this target/process, and update
+  /// the Platform/DynamicLoader.
+  /// The binary will be loaded into the Target, or will be registered with
+  /// the DynamicLoader so that it will be loaded at a later stage.  Returns
+  /// true to indicate that this is a platform binary and has been
+  /// loaded/registered, no further action should be taken by the caller.
+  ///
+  /// \param[in] process
+  ///     Process read memory from, a Process must be provided.
+  ///
+  /// \param[in] addr
+  ///     Address of a binary in memory.
+  ///
+  /// \param[in] notify
+  ///     Whether ModulesDidLoad should be called, if a binary is loaded.
+  ///     Caller may prefer to call ModulesDidLoad for multiple binaries
+  ///     that were loaded at the same time.
+  ///
+  /// \return
+  ///     Returns true if the binary was loaded in the target (or will be
+  ///     via a DynamicLoader).  Returns false if the binary was not
+  ///     loaded/registered, and the caller must load it into the target.
+  bool LoadPlatformBinaryAndSetup(Process *process, lldb::addr_t addr,
+                                  bool notify);
+
 protected:
   typedef std::vector<lldb::PlatformSP> collection;
   mutable std::recursive_mutex m_mutex;

lldb/include/lldb/Target/Process.h

@@ -653,6 +653,8 @@ class Process : public std::enable_shared_from_this<Process>,
   /// plug-in.
   virtual DynamicLoader *GetDynamicLoader();
 
+  void SetDynamicLoader(lldb::DynamicLoaderUP dyld);
+
   // Returns AUXV structure found in many ELF-based environments.
   //
   // The default action is to return an empty data buffer.

lldb/include/lldb/lldb-forward.h

@@ -348,6 +348,7 @@ typedef std::shared_ptr<lldb_private::MemoryRegionInfo> MemoryRegionInfoSP;
 typedef std::shared_ptr<lldb_private::Module> ModuleSP;
 typedef std::weak_ptr<lldb_private::Module> ModuleWP;
 typedef std::shared_ptr<lldb_private::ObjectFile> ObjectFileSP;
+typedef std::shared_ptr<lldb_private::ObjectContainer> ObjectContainerSP;
 typedef std::shared_ptr<lldb_private::ObjectFileJITDelegate>
     ObjectFileJITDelegateSP;
 typedef std::weak_ptr<lldb_private::ObjectFileJITDelegate>

lldb/include/lldb/lldb-private-interfaces.h

@@ -40,6 +40,9 @@ typedef ObjectContainer *(*ObjectContainerCreateInstance)(
     const lldb::ModuleSP &module_sp, lldb::DataBufferSP &data_sp,
     lldb::offset_t data_offset, const FileSpec *file, lldb::offset_t offset,
     lldb::offset_t length);
+typedef ObjectContainer *(*ObjectContainerCreateMemoryInstance)(
+    const lldb::ModuleSP &module_sp, lldb::WritableDataBufferSP data_sp,
+    const lldb::ProcessSP &process_sp, lldb::addr_t offset);
 typedef size_t (*ObjectFileGetModuleSpecifications)(
     const FileSpec &file, lldb::DataBufferSP &data_sp,
     lldb::offset_t data_offset, lldb::offset_t file_offset,

lldb/source/Core/DynamicLoader.cpp

@@ -230,6 +230,10 @@ ModuleSP DynamicLoader::LoadBinaryWithUUIDAndAddress(Process *process,
 
   Log *log = GetLog(LLDBLog::DynamicLoader);
   if (module_sp.get()) {
+    // Ensure the Target has an architecture set in case
+    // we need it while processing this binary/eh_frame/debug info.
+    if (!target.GetArchitecture().IsValid())
+      target.SetArchitecture(module_sp->GetArchitecture());
     target.GetImages().AppendIfNeeded(module_sp, false);
 
     bool changed = false;

lldb/source/Core/PluginManager.cpp

@@ -722,11 +722,14 @@ struct ObjectContainerInstance
   ObjectContainerInstance(
       llvm::StringRef name, llvm::StringRef description,
       CallbackType create_callback,
+      ObjectContainerCreateMemoryInstance create_memory_callback,
       ObjectFileGetModuleSpecifications get_module_specifications)
       : PluginInstance<ObjectContainerCreateInstance>(name, description,
                                                       create_callback),
+        create_memory_callback(create_memory_callback),
         get_module_specifications(get_module_specifications) {}
 
+  ObjectContainerCreateMemoryInstance create_memory_callback;
   ObjectFileGetModuleSpecifications get_module_specifications;
 };
 typedef PluginInstances<ObjectContainerInstance> ObjectContainerInstances;
@@ -739,9 +742,11 @@ static ObjectContainerInstances &GetObjectContainerInstances() {
 bool PluginManager::RegisterPlugin(
     llvm::StringRef name, llvm::StringRef description,
     ObjectContainerCreateInstance create_callback,
-    ObjectFileGetModuleSpecifications get_module_specifications) {
+    ObjectFileGetModuleSpecifications get_module_specifications,
+    ObjectContainerCreateMemoryInstance create_memory_callback) {
   return GetObjectContainerInstances().RegisterPlugin(
-      name, description, create_callback, get_module_specifications);
+      name, description, create_callback, create_memory_callback,
+      get_module_specifications);
 }
 
 bool PluginManager::UnregisterPlugin(
@@ -754,6 +759,14 @@ PluginManager::GetObjectContainerCreateCallbackAtIndex(uint32_t idx) {
   return GetObjectContainerInstances().GetCallbackAtIndex(idx);
 }
 
+ObjectContainerCreateMemoryInstance
+PluginManager::GetObjectContainerCreateMemoryCallbackAtIndex(uint32_t idx) {
+  const auto &instances = GetObjectContainerInstances().GetInstances();
+  if (idx < instances.size())
+    return instances[idx].create_memory_callback;
+  return nullptr;
+}
+
 ObjectFileGetModuleSpecifications
 PluginManager::GetObjectContainerGetModuleSpecificationsCallbackAtIndex(
     uint32_t idx) {

lldb/source/Plugins/DynamicLoader/Darwin-Kernel/CMakeLists.txt

@@ -17,7 +17,6 @@ add_lldb_library(lldbPluginDynamicLoaderDarwinKernel PLUGIN
     lldbSymbol
     lldbTarget
     lldbUtility
-    lldbPluginPlatformMacOSX
   )
 
 add_dependencies(lldbPluginDynamicLoaderDarwinKernel