Reland "Scaffolding for dart:wasm"

This reverts commit 9198813.

Reason for revert: Relanding with a fix

Original change's description:
> Revert "Scaffolding for dart:wasm"
> 
> This reverts commit f39a3f1.
> 
> Reason for revert: https://golem.corp.goog/BuildInfo?target=flutter-profile&machine-type=android-armv7&revision=84750
> 
> Original change's description:
> > Scaffolding for dart:wasm
> > 
> > This CL doesn't have any tests because it's just boilerplate. I'll
> > add a test in the follow up CLs where I add actual functionality.
> > 
> > Bug: #37882
> > Change-Id: I47c81f5f1be724f8226e756ba5d01880a45f1ac7
> > Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/112841
> > Reviewed-by: Siva Annamalai <[email protected]>
> > Reviewed-by: Liam Appelbe <[email protected]>
> > Commit-Queue: Liam Appelbe <[email protected]>
> 
> [email protected],[email protected]
> 
> Change-Id: I0fd0f29d66a07fc29e840ddaec2d4161c8d599cb
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: #37882
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/114044
> Reviewed-by: Liam Appelbe <[email protected]>
> Commit-Queue: Liam Appelbe <[email protected]>

[email protected],[email protected]

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: #37882
Change-Id: Idb43cbd3a0521776ac420bfef91c8a9a4362f18e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/114757
Reviewed-by: Liam Appelbe <[email protected]>
Commit-Queue: Liam Appelbe <[email protected]>

Author: liamappelbe

pkg/vm/lib/target/dart_runner.dart

@@ -36,6 +36,7 @@ class DartRunnerTarget extends VmTarget {
         'dart:typed_data',
         'dart:nativewrappers',
         'dart:io',
+        'dart:wasm',
 
         // Required for dart_runner.
         'dart:fuchsia.builtin',

pkg/vm/lib/target/flutter.dart

@@ -41,6 +41,7 @@ class FlutterTarget extends VmTarget {
         'dart:typed_data',
         'dart:nativewrappers',
         'dart:io',
+        'dart:wasm',
 
         // Required for flutter.
         'dart:ui',

pkg/vm/lib/target/flutter_runner.dart

@@ -36,6 +36,7 @@ class FlutterRunnerTarget extends VmTarget {
         'dart:typed_data',
         'dart:nativewrappers',
         'dart:io',
+        'dart:wasm',
 
         // Required for flutter_runner.
         'dart:fuchsia.builtin',

pkg/vm/lib/target/vm.dart

@@ -77,6 +77,7 @@ class VmTarget extends Target {
         'dart:nativewrappers',
         'dart:io',
         'dart:cli',
+        'dart:wasm',
       ];
 
   void _patchVmConstants(CoreTypes coreTypes) {

runtime/lib/wasm.cc

@@ -0,0 +1,28 @@
+// Copyright (c) 2019, 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 "platform/unicode.h"
+#include "vm/bootstrap_natives.h"
+#include "vm/dart_entry.h"
+
+namespace dart {
+
+int callWasm(const char* name, int n) {
+  return 100 * n;
+}
+
+// This is a temporary API for prototyping.
+DEFINE_NATIVE_ENTRY(Wasm_callFunction, 0, 2) {
+  GET_NON_NULL_NATIVE_ARGUMENT(String, fn_name, arguments->NativeArgAt(0));
+  GET_NON_NULL_NATIVE_ARGUMENT(Integer, arg, arguments->NativeArgAt(1));
+
+  intptr_t len = Utf8::Length(fn_name);
+  std::unique_ptr<char> name = std::unique_ptr<char>(new char[len + 1]);
+  fn_name.ToUTF8(reinterpret_cast<uint8_t*>(name.get()), len);
+  name.get()[len] = 0;
+
+  return Smi::New(callWasm(name.get(), arg.AsInt64Value()));
+}
+
+}  // namespace dart

runtime/lib/wasm_patch.dart

@@ -0,0 +1,8 @@
+// Copyright (c) 2019, 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.
+
+import "dart:_internal" show patch;
+
+@patch
+int _callWasm(String name, int arg) native "Wasm_callFunction";

runtime/lib/wasm_sources.gni

@@ -0,0 +1,7 @@
+# Copyright (c) 2019, 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.
+
+wasm_runtime_cc_files = [ "wasm.cc" ]
+
+wasm_runtime_dart_files = [ "wasm_patch.dart" ]

runtime/vm/BUILD.gn

@@ -16,6 +16,7 @@ import("../../sdk/lib/mirrors/mirrors_sources.gni")
 import("../../sdk/lib/profiler/profiler_sources.gni")
 import("../../sdk/lib/typed_data/typed_data_sources.gni")
 import("../../sdk/lib/vmservice/vmservice_sources.gni")
+import("../../sdk/lib/wasm/wasm_sources.gni")
 import("../../utils/compile_platform.gni")
 import("../bin/cli_sources.gni")
 import("../bin/io_sources.gni")
@@ -33,6 +34,7 @@ import("../lib/mirrors_sources.gni")
 import("../lib/profiler_sources.gni")
 import("../lib/typed_data_sources.gni")
 import("../lib/vmservice_sources.gni")
+import("../lib/wasm_sources.gni")
 import("../runtime_args.gni")
 import("compiler/compiler_sources.gni")
 import("heap/heap_sources.gni")
@@ -106,7 +108,7 @@ library_for_all_configs("libdart_lib") {
                internal_runtime_cc_files + isolate_runtime_cc_files +
                math_runtime_cc_files + mirrors_runtime_cc_files +
                typed_data_runtime_cc_files + vmservice_runtime_cc_files +
-               ffi_runtime_cc_files
+               ffi_runtime_cc_files + wasm_runtime_cc_files
   sources = [ "bootstrap.cc" ] + rebase_path(allsources, ".", "../lib")
   snapshot_sources = []
   nosnapshot_sources = []

runtime/vm/bootstrap_natives.cc

@@ -141,6 +141,11 @@ void Bootstrap::SetupNativeResolver() {
   ASSERT(!library.IsNull());
   library.set_native_entry_resolver(resolver);
   library.set_native_entry_symbol_resolver(symbol_resolver);
+
+  library = Library::WasmLibrary();
+  ASSERT(!library.IsNull());
+  library.set_native_entry_resolver(resolver);
+  library.set_native_entry_symbol_resolver(symbol_resolver);
 }
 
 bool Bootstrap::IsBootstrapResolver(Dart_NativeEntryResolver resolver) {

runtime/vm/bootstrap_natives.h

@@ -12,6 +12,7 @@
 namespace dart {
 
 // List of bootstrap native entry points used in the core dart library.
+// V(function_name, argument_count)
 #define BOOTSTRAP_NATIVE_LIST(V)                                               \
   V(AsyncStarMoveNext_debuggerStepCheck, 1)                                    \
   V(DartAsync_fatal, 1)                                                        \
@@ -392,7 +393,8 @@ namespace dart {
   V(Ffi_dl_processLibrary, 0)                                                  \
   V(Ffi_dl_executableLibrary, 0)                                               \
   V(TransferableTypedData_factory, 2)                                          \
-  V(TransferableTypedData_materialize, 1)
+  V(TransferableTypedData_materialize, 1)                                      \
+  V(Wasm_callFunction, 2)
 
 // List of bootstrap native entry points used in the dart:mirror library.
 #define MIRRORS_BOOTSTRAP_NATIVE_LIST(V)                                       \

runtime/vm/object.cc

@@ -1918,6 +1918,14 @@ RawError* Object::Init(Isolate* isolate,
     pending_classes.Add(cls);
     RegisterClass(cls, Symbols::FfiDynamicLibrary(), lib);
 
+    lib = Library::LookupLibrary(thread, Symbols::DartWasm());
+    if (lib.IsNull()) {
+      lib = Library::NewLibraryHelper(Symbols::DartWasm(), true);
+      lib.SetLoadRequested();
+      lib.Register(thread);
+    }
+    object_store->set_bootstrap_library(ObjectStore::kWasm, lib);
+
     // Finish the initialization by compiling the bootstrap scripts containing
     // the base interfaces and the implementation of the internal classes.
     const Error& error = Error::Handle(
@@ -11742,6 +11750,10 @@ RawLibrary* Library::VMServiceLibrary() {
   return Isolate::Current()->object_store()->_vmservice_library();
 }
 
+RawLibrary* Library::WasmLibrary() {
+  return Isolate::Current()->object_store()->wasm_library();
+}
+
 const char* Library::ToCString() const {
   const String& name = String::Handle(url());
   return OS::SCreate(Thread::Current()->zone(), "Library:'%s'",

runtime/vm/object.h

@@ -4274,6 +4274,7 @@ class Library : public Object {
   static RawLibrary* ProfilerLibrary();
   static RawLibrary* TypedDataLibrary();
   static RawLibrary* VMServiceLibrary();
+  static RawLibrary* WasmLibrary();
 
   // Eagerly compile all classes and functions in the library.
   static RawError* CompileAll(bool ignore_error = false);

runtime/vm/object_store.h

@@ -29,7 +29,8 @@ class ObjectPointerVisitor;
   M(Mirrors, mirrors)                                                          \
   M(Profiler, profiler)                                                        \
   M(TypedData, typed_data)                                                     \
-  M(VMService, _vmservice)
+  M(VMService, _vmservice)                                                     \
+  M(Wasm, wasm)
 
 #define OBJECT_STORE_FIELD_LIST(R_, RW)                                        \
   RW(Class, object_class)                                                      \
@@ -101,6 +102,7 @@ class ObjectPointerVisitor;
   RW(Library, root_library)                                                    \
   RW(Library, typed_data_library)                                              \
   RW(Library, _vmservice_library)                                              \
+  RW(Library, wasm_library)                                                    \
   RW(GrowableObjectArray, libraries)                                           \
   RW(Array, libraries_map)                                                     \
   RW(GrowableObjectArray, closure_functions)                                   \

runtime/vm/symbols.h

@@ -72,6 +72,9 @@ class ObjectPointerVisitor;
   V(DartExtensionScheme, "dart-ext:")                                          \
   V(DartFfi, "dart:ffi")                                                       \
   V(DartFfiLibName, "ffi")                                                     \
+  V(DartWasm, "dart:wasm")                                                     \
+  V(DartWasmLibName, "wasm")                                                   \
+  V(DartLibraryWasm, "dart.library.wasm")                                      \
   V(DartIOLibName, "dart.io")                                                  \
   V(DartInternal, "dart:_internal")                                            \
   V(DartIsVM, "dart.isVM")                                                     \

sdk/BUILD.gn

@@ -84,6 +84,7 @@ declare_args() {
 # ......math/
 # ......mirrors/
 # ......typed_data/
+# ......wasm/
 # ......api_readme.md
 # ....model/
 # ......lexeme/
@@ -216,6 +217,7 @@ _full_sdk_libraries = [
   "profiler",
   "svg",
   "typed_data",
+  "wasm",
   "web_audio",
   "web_gl",
   "web_sql",

sdk/lib/_internal/sdk_library_metadata/lib/libraries.dart

@@ -134,6 +134,8 @@ const Map<String, LibraryInfo> libraries = const {
       categories: "Client",
       maturity: Maturity.WEB_STABLE,
       platforms: DART2JS_PLATFORM),
+  "wasm": const LibraryInfo("wasm/wasm.dart",
+      categories: "Server", maturity: Maturity.EXPERIMENTAL),
   "web_audio": const LibraryInfo("web_audio/dart2js/web_audio_dart2js.dart",
       categories: "Client",
       maturity: Maturity.WEB_STABLE,

sdk/lib/libraries.json

@@ -71,6 +71,12 @@
         ],
         "uri": "ffi/ffi.dart"
       },
+      "wasm": {
+        "patches": [
+          "../../runtime/lib/wasm_patch.dart"
+        ],
+        "uri": "wasm/wasm.dart"
+      },
       "typed_data": {
         "patches": "../../runtime/lib/typed_data_patch.dart",
         "uri": "typed_data/typed_data.dart"
@@ -481,4 +487,4 @@
       }
     }
   }
-}
+}

sdk/lib/libraries.yaml

@@ -94,6 +94,11 @@ vm:
         - "../../runtime/lib/ffi_dynamic_library_patch.dart"
         - "../../runtime/lib/ffi_native_type_patch.dart"
 
+    wasm:
+      uri: "wasm/wasm.dart"
+      patches:
+        - "../../runtime/lib/wasm_patch.dart"
+
     _http:
       uri: "_http/http.dart"
 

sdk/lib/wasm/wasm.dart

@@ -0,0 +1,13 @@
+// Copyright (c) 2019, 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.
+
+/// {@category VM}
+/// {@nodoc}
+library dart.wasm;
+
+int callWasm(String name, int arg) {
+  return _callWasm(name, arg);
+}
+
+external int _callWasm(String name, int arg);

sdk/lib/wasm/wasm_sources.gni

@@ -0,0 +1,7 @@
+# Copyright (c) 2019, 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.
+
+wasm_sdk_sources = [
+  "wasm.dart",
+]