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, 170 insertions, 0 deletions

diff --git a/deps/v8/src/execution/simulator.h b/deps/v8/src/execution/simulator.h
new file mode 100644
index 0000000000..9f98f2039b
--- /dev/null
+++ b/deps/v8/src/execution/simulator.h
@@ -0,0 +1,170 @@
+// Copyright 2009 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_EXECUTION_SIMULATOR_H_
+#define V8_EXECUTION_SIMULATOR_H_
+
+#include "src/common/globals.h"
+#include "src/objects/code.h"
+
+#if !defined(USE_SIMULATOR)
+#include "src/utils/utils.h"
+#endif
+
+#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
+// No simulator for ia32 or x64.
+#elif V8_TARGET_ARCH_ARM64
+#include "src/execution/arm64/simulator-arm64.h"
+#elif V8_TARGET_ARCH_ARM
+#include "src/execution/arm/simulator-arm.h"
+#elif V8_TARGET_ARCH_PPC
+#include "src/execution/ppc/simulator-ppc.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "src/execution/mips/simulator-mips.h"
+#elif V8_TARGET_ARCH_MIPS64
+#include "src/execution/mips64/simulator-mips64.h"
+#elif V8_TARGET_ARCH_S390
+#include "src/execution/s390/simulator-s390.h"
+#else
+#error Unsupported target architecture.
+#endif
+
+namespace v8 {
+namespace internal {
+
+#if defined(USE_SIMULATOR)
+// Running with a simulator.
+
+// The simulator has its own stack. Thus it has a different stack limit from
+// the C-based native code.  The JS-based limit normally points near the end of
+// the simulator stack.  When the C-based limit is exhausted we reflect that by
+// lowering the JS-based limit as well, to make stack checks trigger.
+class SimulatorStack : public v8::internal::AllStatic {
+ public:
+  static inline uintptr_t JsLimitFromCLimit(v8::internal::Isolate* isolate,
+                                            uintptr_t c_limit) {
+    return Simulator::current(isolate)->StackLimit(c_limit);
+  }
+
+  // Returns the current stack address on the simulator stack frame.
+  // The returned address is comparable with JS stack address.
+  static inline uintptr_t RegisterJSStackComparableAddress(
+      v8::internal::Isolate* isolate) {
+    // The value of |kPlaceHolder| is actually not used.  It just occupies a
+    // single word on the stack frame of the simulator.
+    const uintptr_t kPlaceHolder = 0x4A535350u;  // "JSSP" in ASCII
+    return Simulator::current(isolate)->PushAddress(kPlaceHolder);
+  }
+
+  static inline void UnregisterJSStackComparableAddress(
+      v8::internal::Isolate* isolate) {
+    Simulator::current(isolate)->PopAddress();
+  }
+};
+
+#else  // defined(USE_SIMULATOR)
+// Running without a simulator on a native platform.
+
+// The stack limit beyond which we will throw stack overflow errors in
+// generated code. Because generated code uses the C stack, we just use
+// the C stack limit.
+class SimulatorStack : public v8::internal::AllStatic {
+ public:
+  static inline uintptr_t JsLimitFromCLimit(v8::internal::Isolate* isolate,
+                                            uintptr_t c_limit) {
+    USE(isolate);
+    return c_limit;
+  }
+
+  // Returns the current stack address on the native stack frame.
+  // The returned address is comparable with JS stack address.
+  static inline uintptr_t RegisterJSStackComparableAddress(
+      v8::internal::Isolate* isolate) {
+    USE(isolate);
+    return internal::GetCurrentStackPosition();
+  }
+
+  static inline void UnregisterJSStackComparableAddress(
+      v8::internal::Isolate* isolate) {
+    USE(isolate);
+  }
+};
+
+#endif  // defined(USE_SIMULATOR)
+
+// Use this class either as {GeneratedCode<ret, arg1, arg2>} or
+// {GeneratedCode<ret(arg1, arg2)>} (see specialization below).
+template <typename Return, typename... Args>
+class GeneratedCode {
+ public:
+  using Signature = Return(Args...);
+
+  static GeneratedCode FromAddress(Isolate* isolate, Address addr) {
+    return GeneratedCode(isolate, reinterpret_cast<Signature*>(addr));
+  }
+
+  static GeneratedCode FromBuffer(Isolate* isolate, byte* buffer) {
+    return GeneratedCode(isolate, reinterpret_cast<Signature*>(buffer));
+  }
+
+  static GeneratedCode FromCode(Code code) {
+    return FromAddress(code.GetIsolate(), code.entry());
+  }
+
+#ifdef USE_SIMULATOR
+  // Defined in simulator-base.h.
+  Return Call(Args... args) {
+    return Simulator::current(isolate_)->template Call<Return>(
+        reinterpret_cast<Address>(fn_ptr_), args...);
+  }
+
+  DISABLE_CFI_ICALL Return CallIrregexp(Args... args) { return Call(args...); }
+#else
+
+  DISABLE_CFI_ICALL Return Call(Args... args) {
+    // When running without a simulator we call the entry directly.
+#if V8_OS_AIX
+    // AIX ABI requires function descriptors (FD).  Artificially create a pseudo
+    // FD to ensure correct dispatch to generated code.  The 'volatile'
+    // declaration is required to avoid the compiler from not observing the
+    // alias of the pseudo FD to the function pointer, and hence, optimizing the
+    // pseudo FD declaration/initialization away.
+    volatile Address function_desc[] = {reinterpret_cast<Address>(fn_ptr_), 0,
+                                        0};
+    Signature* fn = reinterpret_cast<Signature*>(function_desc);
+    return fn(args...);
+#else
+    return fn_ptr_(args...);
+#endif  // V8_OS_AIX
+  }
+
+  DISABLE_CFI_ICALL Return CallIrregexp(Args... args) {
+    // When running without a simulator we call the entry directly.
+    return fn_ptr_(args...);
+  }
+#endif  // USE_SIMULATOR
+
+ private:
+  friend class GeneratedCode<Return(Args...)>;
+  Isolate* isolate_;
+  Signature* fn_ptr_;
+  GeneratedCode(Isolate* isolate, Signature* fn_ptr)
+      : isolate_(isolate), fn_ptr_(fn_ptr) {}
+};
+
+// Allow to use {GeneratedCode<ret(arg1, arg2)>} instead of
+// {GeneratedCode<ret, arg1, arg2>}.
+template <typename Return, typename... Args>
+class GeneratedCode<Return(Args...)> : public GeneratedCode<Return, Args...> {
+ public:
+  // Automatically convert from {GeneratedCode<ret, arg1, arg2>} to
+  // {GeneratedCode<ret(arg1, arg2)>}.
+  GeneratedCode(GeneratedCode<Return, Args...> other)
+      : GeneratedCode<Return, Args...>(other.isolate_, other.fn_ptr_) {}
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_EXECUTION_SIMULATOR_H_