deps: update V8 to 7.6.303.28

PR-URL: https://github.com/nodejs/node/pull/28016
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann (רפאל פלחי) <refack@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

1 files changed, 102 insertions, 0 deletions

diff --git a/deps/v8/src/execution/simulator-base.cc b/deps/v8/src/execution/simulator-base.cc
new file mode 100644
index 0000000000..b26c775917
--- /dev/null
+++ b/deps/v8/src/execution/simulator-base.cc
@@ -0,0 +1,102 @@
+// Copyright 2017 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/execution/simulator-base.h"
+
+#include "src/execution/isolate.h"
+#include "src/execution/simulator.h"
+
+#if defined(USE_SIMULATOR)
+
+namespace v8 {
+namespace internal {
+
+// static
+base::Mutex* SimulatorBase::redirection_mutex_ = nullptr;
+
+// static
+Redirection* SimulatorBase::redirection_ = nullptr;
+
+// static
+base::Mutex* SimulatorBase::i_cache_mutex_ = nullptr;
+
+// static
+base::CustomMatcherHashMap* SimulatorBase::i_cache_ = nullptr;
+
+// static
+void SimulatorBase::InitializeOncePerProcess() {
+  DCHECK_NULL(redirection_mutex_);
+  redirection_mutex_ = new base::Mutex();
+
+  DCHECK_NULL(i_cache_mutex_);
+  i_cache_mutex_ = new base::Mutex();
+
+  DCHECK_NULL(i_cache_);
+  i_cache_ = new base::CustomMatcherHashMap(&Simulator::ICacheMatch);
+}
+
+// static
+void SimulatorBase::GlobalTearDown() {
+  delete redirection_mutex_;
+  redirection_mutex_ = nullptr;
+
+  Redirection::DeleteChain(redirection_);
+  redirection_ = nullptr;
+
+  delete i_cache_mutex_;
+  i_cache_mutex_ = nullptr;
+
+  if (i_cache_ != nullptr) {
+    for (base::HashMap::Entry* entry = i_cache_->Start(); entry != nullptr;
+         entry = i_cache_->Next(entry)) {
+      delete static_cast<CachePage*>(entry->value);
+    }
+  }
+  delete i_cache_;
+  i_cache_ = nullptr;
+}
+
+// static
+Address SimulatorBase::RedirectExternalReference(Address external_function,
+                                                 ExternalReference::Type type) {
+  base::MutexGuard lock_guard(Simulator::redirection_mutex());
+  Redirection* redirection = Redirection::Get(external_function, type);
+  return redirection->address_of_instruction();
+}
+
+Redirection::Redirection(Address external_function,
+                         ExternalReference::Type type)
+    : external_function_(external_function), type_(type), next_(nullptr) {
+  next_ = Simulator::redirection();
+  base::MutexGuard lock_guard(Simulator::i_cache_mutex());
+  Simulator::SetRedirectInstruction(
+      reinterpret_cast<Instruction*>(address_of_instruction()));
+  Simulator::FlushICache(Simulator::i_cache(),
+                         reinterpret_cast<void*>(&instruction_),
+                         sizeof(instruction_));
+  Simulator::set_redirection(this);
+#if ABI_USES_FUNCTION_DESCRIPTORS
+  function_descriptor_[0] = reinterpret_cast<intptr_t>(&instruction_);
+  function_descriptor_[1] = 0;
+  function_descriptor_[2] = 0;
+#endif
+}
+
+// static
+Redirection* Redirection::Get(Address external_function,
+                              ExternalReference::Type type) {
+  Redirection* current = Simulator::redirection();
+  for (; current != nullptr; current = current->next_) {
+    if (current->external_function_ == external_function &&
+        current->type_ == type) {
+      return current;
+    }
+  }
+  return new Redirection(external_function, type);
+}
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // defined(USE_SIMULATOR)