First step towards loading the core library scripts directly from the sources

runtime/vm/bootstrap.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bootstrap.h"
 
 #include "include/dart_api.h"
 
 #include "vm/bootstrap_natives.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
+#include "vm/symbols.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, print_bootstrap, false, "Print the bootstrap source.");
 
-
-RawScript* Bootstrap::LoadScript(const char* url,
-                                 const char* source,
-                                 bool patch) {
-  return Script::New(String::Handle(String::New(url, Heap::kOld)),
-                     String::Handle(String::New(source, Heap::kOld)),
-                     patch ? RawScript::kPatchTag : RawScript::kLibraryTag);
-}
-
-
-RawScript* Bootstrap::LoadAsyncScript(bool patch) {
-  const char* url = patch ? "dart:async-patch" : "dart:async";
-  const char* source = patch ? async_patch_ : async_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadCoreScript(bool patch) {
-  // TODO(iposva): Use proper library name.
-  const char* url = patch ? "dart:core-patch" : "bootstrap";
-  const char* source = patch ? corelib_patch_ : corelib_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadCollectionScript(bool patch) {
-  const char* url = patch ? "dart:collection-patch" : "dart:collection";
-  const char* source = patch ? collection_patch_ : collection_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadCollectionDevScript(bool patch) {
-  const char* url =
-      patch ? "dart:_collection-dev-patch" : "dart:_collection-dev";
-  const char* source = patch ? collection_dev_patch_ : collection_dev_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadCryptoScript(bool patch) {
-  const char* url = patch ? "dart:crypto-patch" : "dart:crypto";
-  const char* source = patch ? crypto_source_ : crypto_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadIsolateScript(bool patch)  {
-  const char* url = patch ? "dart:isolate-patch" : "dart:isolate";
-  const char* source = patch ? isolate_patch_ : isolate_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadJsonScript(bool patch) {
-  const char* url = patch ? "dart:json-patch" : "dart:json";
-  const char* source = patch ? json_patch_ : json_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadMathScript(bool patch) {
-  const char* url = patch ? "dart:math-patch" : "dart:math";
-  const char* source = patch ? math_patch_ : math_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadMirrorsScript(bool patch)  {
-  const char* url = patch ? "dart:mirrors-patch" : "dart:mirrors";
-  const char* source = patch ? mirrors_patch_ : mirrors_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadTypedDataScript(bool patch) {
-  const char* url = patch ? "dart:typed_data_patch" : "dart:typed_data";
-  const char* source = patch ? typed_data_patch_ : typed_data_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadUriScript(bool patch) {
-  const char* url = patch ? "dart:uri-patch" : "dart:uri";
-  const char* source = patch ? uri_source_ : uri_source_;
-  return LoadScript(url, source, patch);
-}
-
-
-RawScript* Bootstrap::LoadUtfScript(bool patch) {
-  const char* url = patch ? "dart:utf-patch" : "dart:utf";
-  const char* source = patch ? utf_source_ : utf_source_;
-  return LoadScript(url, source, patch);
+#define INIT_LIBRARY(index, name, source, patch)                               \
+  { index,                                                                     \
+    "dart:"#name, source,                                                      \
+    "dart:"#name"-patch", patch }                                              \
+
+typedef struct {
+  intptr_t index_;
+  const char* url_;

[Ivan Posva, 2013/04/29 04:42:32]

We should use URI instead of URL. I know that will add inconsistencies in
naming, but I don't think we should add more usage of URL.

[siva, 2013/04/29 17:35:58]

Done.

I have only changed the name in these changes and did not try a global change.

+  const char* source_;
+  const char* patch_url_;
+  const char* patch_source_;
+} bootstrap_lib_props;

[Ivan Posva, 2013/04/29 04:42:32]

Empty lines.

[siva, 2013/04/29 17:35:58]

Done.

+static bootstrap_lib_props bootstrap_libraries[] = {
+  INIT_LIBRARY(ObjectStore::kAsync,
+               async,
+               Bootstrap::async_source_,
+               Bootstrap::async_patch_),
+  INIT_LIBRARY(ObjectStore::kCollection,
+               collection,
+               Bootstrap::collection_source_,
+               Bootstrap::collection_patch_),
+  INIT_LIBRARY(ObjectStore::kCollectionDev,
+               _collection-dev,
+               Bootstrap::collection_dev_source_,
+               Bootstrap::collection_dev_patch_),
+  INIT_LIBRARY(ObjectStore::kCrypto,
+               crypto,
+               Bootstrap::crypto_source_,
+               NULL),
+  INIT_LIBRARY(ObjectStore::kIsolate,
+               isolate,
+               Bootstrap::isolate_source_,
+               Bootstrap::isolate_patch_),
+  INIT_LIBRARY(ObjectStore::kJson,
+               json,
+               Bootstrap::json_source_,
+               Bootstrap::json_patch_),
+  INIT_LIBRARY(ObjectStore::kMath,
+               math,
+               Bootstrap::math_source_,
+               Bootstrap::math_patch_),
+  INIT_LIBRARY(ObjectStore::kMirrors,
+               mirrors,
+               Bootstrap::mirrors_source_,
+               Bootstrap::mirrors_patch_),
+  INIT_LIBRARY(ObjectStore::kTypedData,
+               typed_data,
+               Bootstrap::typed_data_source_,
+               Bootstrap::typed_data_patch_),
+  INIT_LIBRARY(ObjectStore::kUtf,
+               utf,
+               Bootstrap::utf_source_,
+               NULL),
+  INIT_LIBRARY(ObjectStore::kUri,
+               uri,
+               Bootstrap::uri_source_,
+               NULL),
+
+  { ObjectStore::kNone, NULL, NULL, NULL, NULL }
+};
+
+
+static RawString* GetCoreLibrarySource(bool patch) {
+  // TODO(asiva): Replace with actual read of the source file.
+  const char* source = patch ? Bootstrap::corelib_patch_ :
+                               Bootstrap::corelib_source_;
+  ASSERT(source != NULL);
+  return String::New(source, Heap::kOld);
+}
+
+
+static RawString* GetLibrarySource(intptr_t index, bool patch) {
+  // TODO(asiva): Replace with actual read of the source file.
+  const char* source = patch ? bootstrap_libraries[index].patch_source_ :
+                               bootstrap_libraries[index].source_;
+  ASSERT(source != NULL);
+  return String::New(source, Heap::kOld);
+}
+
+
+static Dart_Handle LoadPartSource(Isolate* isolate,
+                                  const Library& lib,
+                                  const String& url) {
+  // TODO(asiva): For now we return an error here, once we start
+  // loading libraries from the real source this would have to call the
+  // file read callback here and invoke Compiler::Compile on it.
+  return Dart_NewApiError("Unable to load source '%s' ", url.ToCString());
+}
+
+
+Dart_Handle BootStrapLibraryTagHandler(Dart_LibraryTag tag,

[Ivan Posva, 2013/04/29 04:42:32]

BootstrapLibraryTagHandler?

[siva, 2013/04/29 17:35:58]

Done.

+                                       Dart_Handle library,
+                                       Dart_Handle url) {
+  Isolate* isolate = Isolate::Current();
+  if (!Dart_IsLibrary(library)) {
+    return Dart_NewApiError("not a library");
+  }
+  if (!Dart_IsString(url)) {
+    return Dart_NewApiError("url is not a string");
+  }
+  const String& url_str = Api::UnwrapStringHandle(isolate, url);
+  ASSERT(!url_str.IsNull());
+  bool is_dart_scheme_url = url_str.StartsWith(Symbols::DartScheme());
+  if (!is_dart_scheme_url) {
+    // The bootstrap tag handler can only handle dart scheme urls.
+    return Dart_NewApiError("Do not know how to load '%s' ",
+                            url_str.ToCString());
+  }
+  if (tag == kCanonicalizeUrl) {
+    // Dart Scheme URLs do not need any canonicalization.
+    return url;
+  }
+  if (tag == kImportTag) {
+    // We expect the core boot strap libraries to only import other

[Ivan Posva, 2013/04/29 04:42:32]

bootstrap
Here and below to be consistent.

[siva, 2013/04/29 17:35:58]

Done.

+    // core boot strap libraries.
+    // We have precreated all the bootstrap library objects hence
+    // we do not expect to be called back with the tag set to kImportTag.
+    // The boot strap process explicitly loads all the libraries one by one.
+    return Dart_NewApiError("Invalid import of '%s' in a bootstrap library",
+                            url_str.ToCString());
+  }
+  ASSERT(tag == kSourceTag);
+  const Library& lib = Api::UnwrapLibraryHandle(isolate, library);
+  ASSERT(!lib.IsNull());
+  return LoadPartSource(isolate, lib, url_str);
+}
+
+
+RawError* Bootstrap::LoadandCompileScripts(const Script& core_script) {
+  Isolate* isolate = Isolate::Current();
+  String& url = String::Handle();
+  String& patch_url = String::Handle();
+  String& source = String::Handle();
+  Script& script = Script::Handle();
+  Library& lib = Library::Handle();
+  Error& error = Error::Handle();
+  Dart_LibraryTagHandler saved_tag_handler = isolate->library_tag_handler();
+
+  // Set the library tag handler for the isolate to the bootstrap
+  // library tag handler so that we can load all the bootstrap libraries.
+  isolate->set_library_tag_handler(BootStrapLibraryTagHandler);
+
+  // Enter the Dart Scope as we will be calling back into the library
+  // tag handler when compiling the boot strap libraries.
+  Dart_EnterScope();
+
+  // Create library objects for all the bootstrap libraries.
+  intptr_t i = 0;
+  while (bootstrap_libraries[i].index_ != ObjectStore::kNone) {
+    url = Symbols::New(bootstrap_libraries[i].url_);
+    lib = Library::LookupLibrary(url);
+    if (lib.IsNull()) {
+      lib = Library::NewLibraryHelper(url, false);
+      lib.Register();
+    }
+    isolate->object_store()->set_bootstrap_library(
+        bootstrap_libraries[i].index_, lib);
+    i = i + 1;
+  }
+
+  // Compile and patch the core library.
+  lib = Library::CoreLibrary();
+  ASSERT(!lib.IsNull());
+  error = Bootstrap::Compile(lib, core_script);

[Ivan Posva, 2013/04/29 04:42:32]

Why is core special here? Can't we add it to the list of bootstrap libraries?

[siva, 2013/04/29 17:35:58]

We precreate the core script in Object::Init so that we can set the script field
for all the core classes
(instance, int, double, string, list) that we precreate before any of the
scripts are compiled.

Hence over here we do not try to create another script object instead we just
use that object and just compile it.

On 2013/04/29 04:42:32, Ivan Posva wrote:

+  if (error.IsNull()) {
+    patch_url = String::New("dart:core-patch", Heap::kOld);
+    source = GetCoreLibrarySource(true);
+    script = Script::New(patch_url, source, RawScript::kPatchTag);
+    error = lib.Patch(script);
+
+    // Load and compile other bootstrap libraries.
+    if (error.IsNull()) {
+      i = 0;
+      while (bootstrap_libraries[i].index_ != ObjectStore::kNone) {
+        url = Symbols::New(bootstrap_libraries[i].url_);
+        lib = Library::LookupLibrary(url);
+        ASSERT(!lib.IsNull());
+        source = GetLibrarySource(i, false);
+        script = Script::New(url, source, RawScript::kLibraryTag);
+        error = Bootstrap::Compile(lib, script);
+        if (!error.IsNull()) {
+          break;
+        }
+        // If a patch exists, load and patch the script.
+        if (bootstrap_libraries[i].patch_source_ != NULL) {
+          patch_url = String::New(bootstrap_libraries[i].patch_url_,
+                                  Heap::kOld);
+          source = GetLibrarySource(i, true);
+          script = Script::New(patch_url, source, RawScript::kPatchTag);
+          error = lib.Patch(script);
+          if (!error.IsNull()) {
+            break;
+          }
+        }
+        i = i + 1;
+      }
+      if (error.IsNull()) {
+        SetupNativeResolver();
+      }
+    }
+  }
+
+  // Exit the Dart scope.
+  Dart_ExitScope();
+
+  // Restore the library tag handler for the isolate.
+  isolate->set_library_tag_handler(saved_tag_handler);
+
+  return error.raw();
+}
+
+
+RawScript* Bootstrap::LoadCoreScript() {

[Ivan Posva, 2013/04/29 04:42:32]

What is this still needed for?

[siva, 2013/04/29 17:35:58]

See comment above about.

Maybe I should investigate if that whole code in Object::Init can be done
without setting the script.

On 2013/04/29 04:42:32, Ivan Posva wrote:

+  return Script::New(String::Handle(String::New("bootstrap", Heap::kOld)),
+                     String::Handle(GetCoreLibrarySource(false)),
+                     RawScript::kLibraryTag);
 }
 
 
 RawError* Bootstrap::Compile(const Library& library, const Script& script) {
   if (FLAG_print_bootstrap) {
     OS::Print("Bootstrap source '%s':\n%s\n",
-        String::Handle(script.url()).ToCString(),
-        String::Handle(script.Source()).ToCString());
+              String::Handle(script.url()).ToCString(),
+              String::Handle(script.Source()).ToCString());
   }
   library.SetLoadInProgress();
   const Error& error = Error::Handle(Compiler::Compile(library, script));
   if (error.IsNull()) {
     library.SetLoaded();
   } else {
     library.SetLoadError();
   }
   return error.raw();
 }
 
 }  // namespace dart