Hooking up asm-wasm conversion.

src/asmjs/asm-js.cc

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/asmjs/asm-js.h"
+
+#include "src/api-natives.h"
+#include "src/api.h"
+#include "src/asmjs/asm-wasm-builder.h"
+#include "src/asmjs/typing-asm.h"
+#include "src/assert-scope.h"
+#include "src/ast/ast.h"
+#include "src/ast/scopes.h"
+#include "src/execution.h"
+#include "src/factory.h"
+#include "src/handles.h"
+#include "src/isolate.h"
+#include "src/objects.h"
+#include "src/parsing/parser.h"
+
+#include "src/wasm/encoder.h"
+#include "src/wasm/module-decoder.h"
+#include "src/wasm/wasm-js.h"
+#include "src/wasm/wasm-module.h"
+#include "src/wasm/wasm-result.h"
+
+typedef uint8_t byte;
+
+using v8::internal::wasm::ErrorThrower;
+
+namespace v8 {
+namespace internal {
+
+namespace {
+i::MaybeHandle<i::FixedArray> CompileModule(
+    i::Isolate* isolate, const byte* start, const byte* end,
+    ErrorThrower* thrower,
+    internal::wasm::ModuleOrigin origin = i::wasm::kWasmOrigin) {
+  // Decode but avoid a redundant pass over function bodies for verification.
+  // Verification will happen during compilation.
+  i::Zone zone(isolate->allocator());
+  internal::wasm::ModuleResult result = internal::wasm::DecodeWasmModule(
+      isolate, &zone, start, end, false, origin);
+
+  i::MaybeHandle<i::FixedArray> compiled_module;
+  if (result.failed() && origin == internal::wasm::kAsmJsOrigin) {
+    thrower->Error("Asm.js converted module failed to decode");
+  } else if (result.failed()) {
+    thrower->Failed("", result);
+  } else {
+    compiled_module = result.val->CompileFunctions(isolate);
+  }
+
+  if (result.val) delete result.val;
+  return compiled_module;
+}
+
+}  // namespace
+
+MaybeHandle<FixedArray> AsmJs::ConvertAsmToWasm(ParseInfo* info) {
+  ErrorThrower thrower(info->isolate(), "Asm.js -> WebAssembly conversion");
+  AsmTyper typer(info->isolate(), info->zone(), *(info->script()),
+                 info->literal());
+  typer.set_fixed_signature(true);
+  if (i::FLAG_enable_simd_asmjs) {
+    typer.set_allow_simd(true);
+  }
+  if (!typer.Validate()) {
+    DCHECK(!info->isolate()->has_pending_exception());
+    PrintF("Validation of asm.js module failed: %s", typer.error_message());
+    return MaybeHandle<FixedArray>();
+  }
+  v8::internal::wasm::AsmWasmBuilder builder(info->isolate(), info->zone(),
+                                             info->literal(), &typer);
+  i::Handle<i::FixedArray> foreign_globals;
+  auto module = builder.Run(&foreign_globals);
+  size_t byte_length = module->end() - module->begin();
+  Handle<JSArrayBuffer> buffer = info->isolate()->factory()->NewJSArrayBuffer();
+  JSArrayBuffer::SetupAllocatingData(buffer, info->isolate(), byte_length,
+                                     false, SharedFlag::kNotShared);
+  uint8_t* module_bytes = reinterpret_cast<uint8_t*>(buffer->backing_store());
+  memcpy(module_bytes, module->begin(), byte_length);
+  Handle<FixedArray> result = info->isolate()->factory()->NewFixedArray(2);
+  result->set(0, *buffer);
+  result->set(1, *foreign_globals);
+  return result;
+}
+
+MaybeHandle<Object> AsmJs::InstantiateAsmWasm(i::Isolate* isolate,
+                                              Handle<FixedArray> wasm_data,
+                                              Handle<JSArrayBuffer> memory,
+                                              Handle<JSObject> foreign) {
+  i::Handle<i::JSArrayBuffer> module_bytes(
+      i::JSArrayBuffer::cast(wasm_data->get(0)));
+  i::Handle<i::FixedArray> foreign_globals(
+      i::FixedArray::cast(wasm_data->get(1)));
+
+  ErrorThrower thrower(isolate, "Asm.js -> WebAssembly instantiation");
+
+  const byte* module_start =
+      reinterpret_cast<const byte*>(module_bytes->backing_store());
+  size_t module_length =
+      static_cast<size_t>(module_bytes->byte_length()->Number());
+  const byte* module_end = module_start + module_length;
+  i::MaybeHandle<i::FixedArray> compiled =
+      CompileModule(isolate, module_start, module_end, &thrower,
+                    internal::wasm::kAsmJsOrigin);
+  if (compiled.is_null()) {
+    return MaybeHandle<Object>();
+  }
+  i::MaybeHandle<i::JSObject> maybe_module_object =
+      i::wasm::WasmModule::Instantiate(isolate, compiled.ToHandleChecked(),
+                                       foreign, memory);
+  if (maybe_module_object.is_null()) {
+    return MaybeHandle<Object>();
+  }
+
+  i::Handle<i::Name> name(isolate->factory()->InternalizeOneByteString(
+      STATIC_CHAR_VECTOR("__foreign_init__")));
+
+  i::Handle<i::Object> module_object = maybe_module_object.ToHandleChecked();
+  i::MaybeHandle<i::Object> maybe_init =
+      i::Object::GetProperty(module_object, name);
+  DCHECK(!maybe_init.is_null());
+
+  i::Handle<i::Object> init = maybe_init.ToHandleChecked();
+  i::Handle<i::Object> undefined(isolate->heap()->undefined_value(), isolate);
+  i::Handle<i::Object>* foreign_args_array =
+      new i::Handle<i::Object>[foreign_globals->length()];
+  for (int j = 0; j < foreign_globals->length(); j++) {
+    if (!foreign.is_null()) {
+      i::MaybeHandle<i::Name> name = i::Object::ToName(
+          isolate, i::Handle<i::Object>(foreign_globals->get(j), isolate));
+      if (!name.is_null()) {
+        i::MaybeHandle<i::Object> val =
+            i::Object::GetProperty(foreign, name.ToHandleChecked());
+        if (!val.is_null()) {
+          foreign_args_array[j] = val.ToHandleChecked();
+          continue;
+        }
+      }
+    }
+    foreign_args_array[j] = undefined;
+  }
+  i::MaybeHandle<i::Object> retval = i::Execution::Call(
+      isolate, init, undefined, foreign_globals->length(), foreign_args_array);
+  delete[] foreign_args_array;
+
+  if (retval.is_null()) {
+    thrower.Error(
+        "WASM.instantiateModuleFromAsm(): foreign init function failed");
+    return MaybeHandle<Object>();
+  }
+  return maybe_module_object;
+}
+
+}  // namespace internal
+}  // namespace v8