Load AOT compiled Dart assets only from ELF libraries (flutter#9260)

Previously AOT compiled Dart code would be packaged as a group of assets
within the APK.  This has been replaced by a single ELF library containing
the same data.

Author: jason-simmons

shell/common/switches.cc

@@ -235,42 +235,42 @@ Settings SettingsFromCommandLine(const fml::CommandLine& command_line) {
   command_line.GetOptionValue(FlagForSwitch(Switch::FlutterAssetsDir),
                               &settings.assets_path);
 
-  std::string aot_shared_library_path;
-  command_line.GetOptionValue(FlagForSwitch(Switch::AotSharedLibraryPath),
-                              &aot_shared_library_path);
+  std::string aot_shared_library_name;
+  command_line.GetOptionValue(FlagForSwitch(Switch::AotSharedLibraryName),
+                              &aot_shared_library_name);
 
-  std::string aot_snapshot_path;
-  command_line.GetOptionValue(FlagForSwitch(Switch::AotSnapshotPath),
-                              &aot_snapshot_path);
+  std::string snapshot_asset_path;
+  command_line.GetOptionValue(FlagForSwitch(Switch::SnapshotAssetPath),
+                              &snapshot_asset_path);
 
-  std::string aot_vm_snapshot_data_filename;
-  command_line.GetOptionValue(FlagForSwitch(Switch::AotVmSnapshotData),
-                              &aot_vm_snapshot_data_filename);
+  std::string vm_snapshot_data_filename;
+  command_line.GetOptionValue(FlagForSwitch(Switch::VmSnapshotData),
+                              &vm_snapshot_data_filename);
 
-  std::string aot_vm_snapshot_instr_filename;
-  command_line.GetOptionValue(FlagForSwitch(Switch::AotVmSnapshotInstructions),
-                              &aot_vm_snapshot_instr_filename);
+  std::string vm_snapshot_instr_filename;
+  command_line.GetOptionValue(FlagForSwitch(Switch::VmSnapshotInstructions),
+                              &vm_snapshot_instr_filename);
 
-  std::string aot_isolate_snapshot_data_filename;
-  command_line.GetOptionValue(FlagForSwitch(Switch::AotIsolateSnapshotData),
-                              &aot_isolate_snapshot_data_filename);
+  std::string isolate_snapshot_data_filename;
+  command_line.GetOptionValue(FlagForSwitch(Switch::IsolateSnapshotData),
+                              &isolate_snapshot_data_filename);
 
-  std::string aot_isolate_snapshot_instr_filename;
+  std::string isolate_snapshot_instr_filename;
   command_line.GetOptionValue(
-      FlagForSwitch(Switch::AotIsolateSnapshotInstructions),
-      &aot_isolate_snapshot_instr_filename);
-
-  if (aot_shared_library_path.size() > 0) {
-    settings.application_library_path = aot_shared_library_path;
-  } else if (aot_snapshot_path.size() > 0) {
-    settings.vm_snapshot_data_path = fml::paths::JoinPaths(
-        {aot_snapshot_path, aot_vm_snapshot_data_filename});
+      FlagForSwitch(Switch::IsolateSnapshotInstructions),
+      &isolate_snapshot_instr_filename);
+
+  if (aot_shared_library_name.size() > 0) {
+    settings.application_library_path = aot_shared_library_name;
+  } else if (snapshot_asset_path.size() > 0) {
+    settings.vm_snapshot_data_path =
+        fml::paths::JoinPaths({snapshot_asset_path, vm_snapshot_data_filename});
     settings.vm_snapshot_instr_path = fml::paths::JoinPaths(
-        {aot_snapshot_path, aot_vm_snapshot_instr_filename});
+        {snapshot_asset_path, vm_snapshot_instr_filename});
     settings.isolate_snapshot_data_path = fml::paths::JoinPaths(
-        {aot_snapshot_path, aot_isolate_snapshot_data_filename});
+        {snapshot_asset_path, isolate_snapshot_data_filename});
     settings.isolate_snapshot_instr_path = fml::paths::JoinPaths(
-        {aot_snapshot_path, aot_isolate_snapshot_instr_filename});
+        {snapshot_asset_path, isolate_snapshot_instr_filename});
   }
 
   command_line.GetOptionValue(FlagForSwitch(Switch::CacheDirPath),

shell/common/switches.h

@@ -24,28 +24,30 @@ namespace flutter {
 // clang-format on
 
 DEF_SWITCHES_START
-DEF_SWITCH(AotSharedLibraryPath, "aot-shared-library-path", "Path to the *.so.")
-DEF_SWITCH(AotSnapshotPath,
-           "aot-snapshot-path",
+DEF_SWITCH(AotSharedLibraryName,
+           "aot-shared-library-name",
+           "Name of the *.so containing AOT compiled Dart assets.")
+DEF_SWITCH(SnapshotAssetPath,
+           "snapshot-asset-path",
            "Path to the directory containing the four files specified by "
-           "AotVmSnapshotData, AotVmSnapshotInstructions, "
-           "AotVmSnapshotInstructions and AotIsolateSnapshotInstructions.")
-DEF_SWITCH(AotVmSnapshotData,
+           "VmSnapshotData, VmSnapshotInstructions, "
+           "VmSnapshotInstructions and IsolateSnapshotInstructions.")
+DEF_SWITCH(VmSnapshotData,
            "vm-snapshot-data",
            "The VM snapshot data that will be memory mapped as read-only. "
-           "AotSnapshotPath must be present.")
-DEF_SWITCH(AotVmSnapshotInstructions,
+           "SnapshotAssetPath must be present.")
+DEF_SWITCH(VmSnapshotInstructions,
            "vm-snapshot-instr",
            "The VM instructions snapshot that will be memory mapped as read "
-           "and executable. AotSnapshotPath must be present.")
-DEF_SWITCH(AotIsolateSnapshotData,
+           "and executable. SnapshotAssetPath must be present.")
+DEF_SWITCH(IsolateSnapshotData,
            "isolate-snapshot-data",
            "The isolate snapshot data that will be memory mapped as read-only. "
-           "AotSnapshotPath must be present.")
-DEF_SWITCH(AotIsolateSnapshotInstructions,
+           "SnapshotAssetPath must be present.")
+DEF_SWITCH(IsolateSnapshotInstructions,
            "isolate-snapshot-instr",
            "The isolate instructions snapshot that will be memory mapped as "
-           "read and executable. AotSnapshotPath must be present.")
+           "read and executable. SnapshotAssetPath must be present.")
 DEF_SWITCH(CacheDirPath, "cache-dir-path", "Path to the cache directory.")
 DEF_SWITCH(ICUDataFilePath, "icu-data-file-path", "Path to the ICU data file.")
 DEF_SWITCH(ICUSymbolPrefix,