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, 101 insertions, 0 deletions

diff --git a/deps/v8/src/diagnostics/unwinding-info-win64.h b/deps/v8/src/diagnostics/unwinding-info-win64.h
new file mode 100644
index 0000000000..f6611e7e2e
--- /dev/null
+++ b/deps/v8/src/diagnostics/unwinding-info-win64.h
@@ -0,0 +1,101 @@
+// Copyright 2019 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.
+
+#ifndef V8_DIAGNOSTICS_UNWINDING_INFO_WIN64_H_
+#define V8_DIAGNOSTICS_UNWINDING_INFO_WIN64_H_
+
+#include "include/v8.h"
+#include "include/v8config.h"
+#include "src/common/globals.h"
+
+#if defined(V8_OS_WIN_X64)
+#include "src/base/win32-headers.h"
+
+namespace v8 {
+namespace internal {
+
+namespace win64_unwindinfo {
+
+#define CRASH_HANDLER_FUNCTION_NAME CrashForExceptionInNonABICompliantCodeRange
+#define CRASH_HANDLER_FUNCTION_NAME_STRING \
+  "CrashForExceptionInNonABICompliantCodeRange"
+
+static const int kPushRbpInstructionLength = 1;
+static const int kMovRbpRspInstructionLength = 3;
+static const int kRbpPrefixCodes = 2;
+static const int kRbpPrefixLength =
+    kPushRbpInstructionLength + kMovRbpRspInstructionLength;
+
+/**
+ * Returns true if V8 is configured to emit unwinding data for embedded in the
+ * pdata/xdata sections of the executable. Currently, this happens when V8 is
+ * built with "v8_win64_unwinding_info = true".
+ */
+bool CanEmitUnwindInfoForBuiltins();
+
+/**
+ * Returns true if V8 if we can register unwinding data for the whole code range
+ * of an isolate or WASM module. The first page of the code range is reserved
+ * and writable, to be used to store unwind data, as documented in:
+ * https://docs.microsoft.com/en-us/cpp/build/exception-handling-x64.
+ * In jitless mode V8 does not allocate any executable memory itself so the only
+ * non-abi-compliant code range is in the embedded blob.
+ */
+bool CanRegisterUnwindInfoForNonABICompliantCodeRange();
+
+/**
+ * Registers a custom exception handler for exceptions in V8-generated code.
+ */
+void SetUnhandledExceptionCallback(
+    v8::UnhandledExceptionCallback unhandled_exception_callback);
+
+/**
+ * Returns a vector of bytes that contains the Win64 unwind data used for all
+ * V8 builtin functions.
+ */
+std::vector<uint8_t> GetUnwindInfoForBuiltinFunctions();
+
+void RegisterNonABICompliantCodeRange(void* start, size_t size_in_bytes);
+void UnregisterNonABICompliantCodeRange(void* start);
+
+class BuiltinUnwindInfo {
+ public:
+  BuiltinUnwindInfo() : is_leaf_function_(true) {}
+  explicit BuiltinUnwindInfo(const std::vector<int>& fp_offsets)
+      : is_leaf_function_(false), fp_offsets_(fp_offsets) {}
+
+  bool is_leaf_function() const { return is_leaf_function_; }
+  const std::vector<int>& fp_offsets() const { return fp_offsets_; }
+
+ private:
+  bool is_leaf_function_;
+  std::vector<int> fp_offsets_;
+};
+
+class XdataEncoder {
+ public:
+  explicit XdataEncoder(const Assembler& assembler)
+      : assembler_(assembler), current_push_rbp_offset_(-1) {}
+
+  void onPushRbp();
+  void onMovRbpRsp();
+
+  BuiltinUnwindInfo unwinding_info() const {
+    return BuiltinUnwindInfo(fp_offsets_);
+  }
+
+ private:
+  const Assembler& assembler_;
+  std::vector<int> fp_offsets_;
+  int current_push_rbp_offset_;
+};
+
+}  // namespace win64_unwindinfo
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // defined(V8_OS_WIN_X64)
+
+#endif  // V8_DIAGNOSTICS_UNWINDING_INFO_WIN64_H_