1 files changed, 126 insertions, 0 deletions
diff --git a/deps/v8/src/codegen/turbo-assembler.cc b/deps/v8/src/codegen/turbo-assembler.cc
new file mode 100644
index 0000000000..f46ab0ade5
--- /dev/null
+++ b/deps/v8/src/codegen/turbo-assembler.cc
@@ -0,0 +1,126 @@
+// Copyright 2018 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/codegen/turbo-assembler.h"
+
+#include "src/builtins/builtins.h"
+#include "src/builtins/constants-table-builder.h"
+#include "src/execution/isolate-data.h"
+#include "src/execution/isolate-inl.h"
+#include "src/snapshot/serializer-common.h"
+
+namespace v8 {
+namespace internal {
+
+TurboAssemblerBase::TurboAssemblerBase(Isolate* isolate,
+                                       const AssemblerOptions& options,
+                                       CodeObjectRequired create_code_object,
+                                       std::unique_ptr<AssemblerBuffer> buffer)
+    : Assembler(options, std::move(buffer)), isolate_(isolate) {
+  if (create_code_object == CodeObjectRequired::kYes) {
+    code_object_ = Handle<HeapObject>::New(
+        ReadOnlyRoots(isolate).self_reference_marker(), isolate);
+  }
+}
+
+void TurboAssemblerBase::IndirectLoadConstant(Register destination,
+                                              Handle<HeapObject> object) {
+  CHECK(root_array_available_);
+
+  // Before falling back to the (fairly slow) lookup from the constants table,
+  // check if any of the fast paths can be applied.
+
+  int builtin_index;
+  RootIndex root_index;
+  if (isolate()->roots_table().IsRootHandle(object, &root_index)) {
+    // Roots are loaded relative to the root register.
+    LoadRoot(destination, root_index);
+  } else if (isolate()->builtins()->IsBuiltinHandle(object, &builtin_index)) {
+    // Similar to roots, builtins may be loaded from the builtins table.
+    LoadRootRelative(destination,
+                     RootRegisterOffsetForBuiltinIndex(builtin_index));
+  } else if (object.is_identical_to(code_object_) &&
+             Builtins::IsBuiltinId(maybe_builtin_index_)) {
+    // The self-reference loaded through Codevalue() may also be a builtin
+    // and thus viable for a fast load.
+    LoadRootRelative(destination,
+                     RootRegisterOffsetForBuiltinIndex(maybe_builtin_index_));
+  } else {
+    CHECK(isolate()->IsGeneratingEmbeddedBuiltins());
+    // Ensure the given object is in the builtins constants table and fetch its
+    // index.
+    BuiltinsConstantsTableBuilder* builder =
+        isolate()->builtins_constants_table_builder();
+    uint32_t index = builder->AddObject(object);
+
+    // Slow load from the constants table.
+    LoadFromConstantsTable(destination, index);
+  }
+}
+
+void TurboAssemblerBase::IndirectLoadExternalReference(
+    Register destination, ExternalReference reference) {
+  CHECK(root_array_available_);
+
+  if (IsAddressableThroughRootRegister(isolate(), reference)) {
+    // Some external references can be efficiently loaded as an offset from
+    // kRootRegister.
+    intptr_t offset =
+        RootRegisterOffsetForExternalReference(isolate(), reference);
+    LoadRootRegisterOffset(destination, offset);
+  } else {
+    // Otherwise, do a memory load from the external reference table.
+    LoadRootRelative(
+        destination,
+        RootRegisterOffsetForExternalReferenceTableEntry(isolate(), reference));
+  }
+}
+
+// static
+int32_t TurboAssemblerBase::RootRegisterOffsetForRootIndex(
+    RootIndex root_index) {
+  return IsolateData::root_slot_offset(root_index);
+}
+
+// static
+int32_t TurboAssemblerBase::RootRegisterOffsetForBuiltinIndex(
+    int builtin_index) {
+  return IsolateData::builtin_slot_offset(builtin_index);
+}
+
+// static
+intptr_t TurboAssemblerBase::RootRegisterOffsetForExternalReference(
+    Isolate* isolate, const ExternalReference& reference) {
+  return static_cast<intptr_t>(reference.address() - isolate->isolate_root());
+}
+
+// static
+int32_t TurboAssemblerBase::RootRegisterOffsetForExternalReferenceTableEntry(
+    Isolate* isolate, const ExternalReference& reference) {
+  // Encode as an index into the external reference table stored on the
+  // isolate.
+  ExternalReferenceEncoder encoder(isolate);
+  ExternalReferenceEncoder::Value v = encoder.Encode(reference.address());
+  CHECK(!v.is_from_api());
+
+  return IsolateData::external_reference_table_offset() +
+         ExternalReferenceTable::OffsetOfEntry(v.index());
+}
+
+// static
+bool TurboAssemblerBase::IsAddressableThroughRootRegister(
+    Isolate* isolate, const ExternalReference& reference) {
+  Address address = reference.address();
+  return isolate->root_register_addressable_region().contains(address);
+}
+
+void TurboAssemblerBase::RecordCommentForOffHeapTrampoline(int builtin_index) {
+  if (!FLAG_code_comments) return;
+  std::ostringstream str;
+  str << "-- Inlined Trampoline to " << Builtins::name(builtin_index) << " --";
+  RecordComment(str.str().c_str());
+}
+
+}  // namespace internal
+}  // namespace v8