Revert "[lldb] Expand background symbol lookup" (#81182)

Reverts llvm/llvm-project#80890

lldb/include/lldb/Core/ModuleList.h

@@ -47,26 +47,6 @@ class UUID;
 class VariableList;
 struct ModuleFunctionSearchOptions;
 
-static constexpr OptionEnumValueElement g_auto_download_enum_values[] = {
-    {
-        lldb::eSymbolDownloadOff,
-        "off",
-        "Disable automatically downloading symbols.",
-    },
-    {
-        lldb::eSymbolDownloadBackground,
-        "background",
-        "Download symbols in the background for images as they appear in the "
-        "backtrace.",
-    },
-    {
-        lldb::eSymbolDownloadForeground,
-        "foreground",
-        "Download symbols in the foreground for images as they appear in the "
-        "backtrace.",
-    },
-};
-
 class ModuleListProperties : public Properties {
   mutable llvm::sys::RWMutex m_symlink_paths_mutex;
   PathMappingList m_symlink_paths;
@@ -80,6 +60,7 @@ public:
   bool SetClangModulesCachePath(const FileSpec &path);
   bool GetEnableExternalLookup() const;
   bool SetEnableExternalLookup(bool new_value);
+  bool GetEnableBackgroundLookup() const;
   bool GetEnableLLDBIndexCache() const;
   bool SetEnableLLDBIndexCache(bool new_value);
   uint64_t GetLLDBIndexCacheMaxByteSize();
@@ -90,8 +71,6 @@ public:
 
   bool GetLoadSymbolOnDemand();
 
-  lldb::SymbolDownload GetSymbolAutoDownload() const;
-
   PathMappingList GetSymlinkMappings() const;
 };
 

lldb/include/lldb/lldb-enumerations.h

@@ -1314,12 +1314,6 @@ enum class ChildCacheState {
               ///< re-use what we computed the last time we called Update.
 };
 
-enum SymbolDownload {
-  eSymbolDownloadOff = 0,
-  eSymbolDownloadBackground = 1,
-  eSymbolDownloadForeground = 2,
-};
-
 } // namespace lldb
 
 #endif // LLDB_LLDB_ENUMERATIONS_H

lldb/source/Core/CoreProperties.td

@@ -8,12 +8,7 @@ let Definition = "modulelist" in {
   def EnableBackgroundLookup: Property<"enable-background-lookup", "Boolean">,
     Global,
     DefaultFalse,
-    Desc<"Alias for backward compatibility: when enabled this is the equivalent to 'symbols.download background'.">;
-  def AutoDownload: Property<"auto-download", "Enum">,
-    Global,
-    DefaultEnumValue<"eSymbolDownloadOff">,
-    EnumValues<"OptionEnumValues(g_auto_download_enum_values)">,
-    Desc<"On macOS, automatically download symbols with dsymForUUID (or an equivalent script/binary) for relevant images in the debug session.">;
+    Desc<"On macOS, enable calling dsymForUUID (or an equivalent script/binary) in the background to locate symbol files that weren't found.">;
   def ClangModulesCachePath: Property<"clang-modules-cache-path", "FileSpec">,
     Global,
     DefaultStringValue<"">,

lldb/source/Core/ModuleList.cpp

@@ -104,15 +104,10 @@ bool ModuleListProperties::SetEnableExternalLookup(bool new_value) {
   return SetPropertyAtIndex(ePropertyEnableExternalLookup, new_value);
 }
 
-SymbolDownload ModuleListProperties::GetSymbolAutoDownload() const {
-  // Backward compatibility alias.
-  if (GetPropertyAtIndexAs<bool>(ePropertyEnableBackgroundLookup, false))
-    return eSymbolDownloadBackground;
-
-  const uint32_t idx = ePropertyAutoDownload;
-  return GetPropertyAtIndexAs<lldb::SymbolDownload>(
-      idx, static_cast<lldb::SymbolDownload>(
-               g_modulelist_properties[idx].default_uint_value));
+bool ModuleListProperties::GetEnableBackgroundLookup() const {
+  const uint32_t idx = ePropertyEnableBackgroundLookup;
+  return GetPropertyAtIndexAs<bool>(
+      idx, g_modulelist_properties[idx].default_uint_value != 0);
 }
 
 FileSpec ModuleListProperties::GetClangModulesCachePath() const {

lldb/source/Host/common/Host.cpp

@@ -550,8 +550,6 @@ llvm::Error Host::OpenFileInExternalEditor(llvm::StringRef editor,
 }
 
 bool Host::IsInteractiveGraphicSession() { return false; }
-
-bool Host::IsNetworkLimited() { return false; }
 #endif
 
 std::unique_ptr<Connection> Host::CreateDefaultConnection(llvm::StringRef url) {

lldb/source/Symbol/SymbolLocator.cpp

@@ -10,7 +10,6 @@
 
 #include "lldb/Core/Debugger.h"
 #include "lldb/Core/PluginManager.h"
-#include "lldb/Host/Host.h"
 
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/Support/ThreadPool.h"
@@ -19,10 +18,12 @@ using namespace lldb;
 using namespace lldb_private;
 
 void SymbolLocator::DownloadSymbolFileAsync(const UUID &uuid) {
+  if (!ModuleList::GetGlobalModuleListProperties().GetEnableBackgroundLookup())
+    return;
+
   static llvm::SmallSet<UUID, 8> g_seen_uuids;
   static std::mutex g_mutex;
-
-  auto lookup = [=]() {
+  Debugger::GetThreadPool().async([=]() {
     {
       std::lock_guard<std::mutex> guard(g_mutex);
       if (g_seen_uuids.count(uuid))
@@ -35,23 +36,12 @@ void SymbolLocator::DownloadSymbolFileAsync(const UUID &uuid) {
     module_spec.GetUUID() = uuid;
     if (!PluginManager::DownloadObjectAndSymbolFile(module_spec, error,
                                                     /*force_lookup=*/true,
-                                                    /*copy_executable=*/true))
+                                                    /*copy_executable=*/false))
       return;
 
     if (error.Fail())
       return;
 
     Debugger::ReportSymbolChange(module_spec);
-  };
-
-  switch (ModuleList::GetGlobalModuleListProperties().GetSymbolAutoDownload()) {
-  case eSymbolDownloadOff:
-    break;
-  case eSymbolDownloadBackground:
-    Debugger::GetThreadPool().async(lookup);
-    break;
-  case eSymbolDownloadForeground:
-    lookup();
-    break;
-  };
+  });
 }