dart::bin::Loader Class Reference

#include <loader.h>

Static Public Member Functions
static Dart_Handle	InitForSnapshot (const char *snapshot_uri, IsolateData *isolate_data)
static Dart_Handle	LibraryTagHandler (Dart_LibraryTag tag, Dart_Handle library, Dart_Handle url)
static Dart_Handle	DeferredLoadHandler (intptr_t loading_unit_id)
static void	InitOnce ()

Detailed Description

Definition at line 18 of file loader.h.

Member Function Documentation

DeferredLoadHandler()

Dart_Handle dart::bin::Loader::DeferredLoadHandler ( intptr_t  loading_unit_id )

static

Definition at line 144 of file loader.cc.

                                                                {
  // A synchronous implementation. An asynchronous implementation would be
  // better, but the standalone embedder only implements AOT for testing.
 
  auto isolate_group_data =
      reinterpret_cast<IsolateGroupData*>(Dart_CurrentIsolateGroupData());
  char* unit_url = Utils::SCreate(
      "%s-%" Pd ".part.so", isolate_group_data->script_url, loading_unit_id);
 
  AppSnapshot* loading_unit_snapshot = Snapshot::TryReadAppSnapshot(unit_url);
  Dart_Handle result;
  if (loading_unit_snapshot != nullptr) {
    isolate_group_data->AddLoadingUnit(loading_unit_snapshot);
    const uint8_t* isolate_snapshot_data = nullptr;
    const uint8_t* isolate_snapshot_instructions = nullptr;
    const uint8_t* ignore_vm_snapshot_data;
    const uint8_t* ignore_vm_snapshot_instructions;
    loading_unit_snapshot->SetBuffers(
        &ignore_vm_snapshot_data, &ignore_vm_snapshot_instructions,
        &isolate_snapshot_data, &isolate_snapshot_instructions);
    result = Dart_DeferredLoadComplete(loading_unit_id, isolate_snapshot_data,
                                       isolate_snapshot_instructions);
    if (Dart_IsApiError(result)) {
      result =
          Dart_DeferredLoadCompleteError(loading_unit_id, Dart_GetError(result),
                                         /*transient*/ false);
    }
  } else {
    char* error_message = Utils::SCreate("Failed to load %s", unit_url);
    result = Dart_DeferredLoadCompleteError(loading_unit_id, error_message,
                                            /*transient*/ false);
    free(error_message);
  }
 
  free(unit_url);
  return result;
}

InitForSnapshot()

Dart_Handle dart::bin::Loader::InitForSnapshot ( const char *  snapshot_uri, IsolateData *  isolate_data  )

static

Definition at line 28 of file loader.cc.

                                                               {
  ASSERT(isolate_data != nullptr);
 
  return Loader::Init(isolate_data->packages_file(),
                      DartUtils::original_working_directory, snapshot_uri);
}

InitOnce()

void dart::bin::Loader::InitOnce ( )

static

Definition at line 182 of file loader.cc.

{}

LibraryTagHandler()

Dart_Handle dart::bin::Loader::LibraryTagHandler ( Dart_LibraryTag  tag, Dart_Handle  library, Dart_Handle  url  )

static

Definition at line 69 of file loader.cc.

                                                       {
  const char* url_string = nullptr;
  Dart_Handle result = Dart_StringToCString(url, &url_string);
  if (Dart_IsError(result)) {
    return result;
  }
  if (tag == Dart_kCanonicalizeUrl) {
    Dart_Handle library_url = Dart_LibraryUrl(library);
    if (Dart_IsError(library_url)) {
      return library_url;
    }
    const char* library_url_string = nullptr;
    result = Dart_StringToCString(library_url, &library_url_string);
    if (Dart_IsError(result)) {
      return result;
    }
    bool is_dart_scheme_url = DartUtils::IsDartSchemeURL(url_string);
    bool is_dart_library = DartUtils::IsDartSchemeURL(library_url_string);
    if (is_dart_scheme_url || is_dart_library) {
      return url;
    }
    const char* url_cstr;
    result = Dart_StringToCString(url, &url_cstr);
    if (Dart_IsError(result)) {
      return result;
    }
    CStringUniquePtr resolved_uri = ResolveUri(url_cstr, library_url_string);
    if (!resolved_uri) {
      return DartUtils::NewError("%s: Unable to canonicalize uri '%s'.",
                                 __FUNCTION__, url_cstr);
    }
    result = Dart_NewStringFromCString(resolved_uri.get());
    return result;
  }
#if !defined(DART_PRECOMPILED_RUNTIME)
  if (tag == Dart_kKernelTag) {
    uint8_t* kernel_buffer = nullptr;
    intptr_t kernel_buffer_size = 0;
    if (!dfe.TryReadKernelFile(url_string, nullptr, &kernel_buffer,
                               &kernel_buffer_size)) {
      return DartUtils::NewError("'%s' is not a kernel file", url_string);
    }
    return WrapMallocedKernelBuffer(kernel_buffer, kernel_buffer_size);
  }
  if (dfe.CanUseDartFrontend() && dfe.UseDartFrontend() &&
      (tag == Dart_kImportTag)) {
    // E.g., IsolateMirror.loadUri.
    char* error = nullptr;
    int exit_code = 0;
    uint8_t* kernel_buffer = nullptr;
    intptr_t kernel_buffer_size = -1;
    dfe.CompileAndReadScript(url_string, &kernel_buffer, &kernel_buffer_size,
                             &error, &exit_code, nullptr,
                             /*for_snapshot=*/false, /*embed_sources=*/true);
    if (exit_code == 0) {
      return Dart_LoadLibrary(
          WrapMallocedKernelBuffer(kernel_buffer, kernel_buffer_size));
    } else if (exit_code == kCompilationErrorExitCode) {
      Dart_Handle result = Dart_NewCompilationError(error);
      free(error);
      return result;
    } else {
      Dart_Handle result = Dart_NewApiError(error);
      free(error);
      return result;
    }
  }
  return DartUtils::NewError("Invalid tag : %d '%s'", tag, url_string);
#else   // !defined(DART_PRECOMPILED_RUNTIME)
  return DartUtils::NewError("Unimplemented tag : %d '%s'", tag, url_string);
#endif  // !defined(DART_PRECOMPILED_RUNTIME)
}

---

The documentation for this class was generated from the following files:

• third_party/dart-lang/sdk/runtime/bin/loader.h
• third_party/dart-lang/sdk/runtime/bin/loader.cc