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diff --git a/deps/v8/src/codegen/macro-assembler.h b/deps/v8/src/codegen/macro-assembler.h
new file mode 100644
index 0000000000..29da269e8c
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+++ b/deps/v8/src/codegen/macro-assembler.h
@@ -0,0 +1,220 @@
+// Copyright 2012 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_CODEGEN_MACRO_ASSEMBLER_H_
+#define V8_CODEGEN_MACRO_ASSEMBLER_H_
+
+#include "src/codegen/turbo-assembler.h"
+#include "src/execution/frames.h"
+#include "src/heap/heap.h"
+
+// Helper types to make boolean flag easier to read at call-site.
+enum InvokeFlag { CALL_FUNCTION, JUMP_FUNCTION };
+
+// Flags used for the AllocateInNewSpace functions.
+enum AllocationFlags {
+  // No special flags.
+  NO_ALLOCATION_FLAGS = 0,
+  // The content of the result register already contains the allocation top in
+  // new space.
+  RESULT_CONTAINS_TOP = 1 << 0,
+  // Specify that the requested size of the space to allocate is specified in
+  // words instead of bytes.
+  SIZE_IN_WORDS = 1 << 1,
+  // Align the allocation to a multiple of kDoubleSize
+  DOUBLE_ALIGNMENT = 1 << 2,
+  // Directly allocate in old space
+  PRETENURE = 1 << 3,
+};
+
+// This is the only place allowed to include the platform-specific headers.
+#define INCLUDED_FROM_MACRO_ASSEMBLER_H
+#if V8_TARGET_ARCH_IA32
+#include "src/codegen/ia32/macro-assembler-ia32.h"
+#elif V8_TARGET_ARCH_X64
+#include "src/codegen/x64/macro-assembler-x64.h"
+#elif V8_TARGET_ARCH_ARM64
+#include "src/codegen/arm64/constants-arm64.h"
+#include "src/codegen/arm64/macro-assembler-arm64.h"
+#elif V8_TARGET_ARCH_ARM
+#include "src/codegen/arm/constants-arm.h"
+#include "src/codegen/arm/macro-assembler-arm.h"
+#elif V8_TARGET_ARCH_PPC
+#include "src/codegen/ppc/constants-ppc.h"
+#include "src/codegen/ppc/macro-assembler-ppc.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "src/codegen/mips/constants-mips.h"
+#include "src/codegen/mips/macro-assembler-mips.h"
+#elif V8_TARGET_ARCH_MIPS64
+#include "src/codegen/mips64/constants-mips64.h"
+#include "src/codegen/mips64/macro-assembler-mips64.h"
+#elif V8_TARGET_ARCH_S390
+#include "src/codegen/s390/constants-s390.h"
+#include "src/codegen/s390/macro-assembler-s390.h"
+#else
+#error Unsupported target architecture.
+#endif
+#undef INCLUDED_FROM_MACRO_ASSEMBLER_H
+
+namespace v8 {
+namespace internal {
+
+// Simulators only support C calls with up to kMaxCParameters parameters.
+static constexpr int kMaxCParameters = 9;
+
+class FrameScope {
+ public:
+  explicit FrameScope(TurboAssembler* tasm, StackFrame::Type type)
+      : tasm_(tasm), type_(type), old_has_frame_(tasm->has_frame()) {
+    tasm->set_has_frame(true);
+    if (type != StackFrame::MANUAL && type_ != StackFrame::NONE) {
+      tasm->EnterFrame(type);
+    }
+  }
+
+  ~FrameScope() {
+    if (type_ != StackFrame::MANUAL && type_ != StackFrame::NONE) {
+      tasm_->LeaveFrame(type_);
+    }
+    tasm_->set_has_frame(old_has_frame_);
+  }
+
+  // Normally we generate the leave-frame code when this object goes
+  // out of scope.  Sometimes we may need to generate the code somewhere else
+  // in addition.  Calling this will achieve that, but the object stays in
+  // scope, the MacroAssembler is still marked as being in a frame scope, and
+  // the code will be generated again when it goes out of scope.
+  void GenerateLeaveFrame() {
+    DCHECK(type_ != StackFrame::MANUAL && type_ != StackFrame::NONE);
+    tasm_->LeaveFrame(type_);
+  }
+
+ private:
+  TurboAssembler* tasm_;
+  StackFrame::Type type_;
+  bool old_has_frame_;
+};
+
+class FrameAndConstantPoolScope {
+ public:
+  FrameAndConstantPoolScope(MacroAssembler* masm, StackFrame::Type type)
+      : masm_(masm),
+        type_(type),
+        old_has_frame_(masm->has_frame()),
+        old_constant_pool_available_(FLAG_enable_embedded_constant_pool &&
+                                     masm->is_constant_pool_available()) {
+    masm->set_has_frame(true);
+    if (FLAG_enable_embedded_constant_pool) {
+      masm->set_constant_pool_available(true);
+    }
+    if (type_ != StackFrame::MANUAL && type_ != StackFrame::NONE) {
+      masm->EnterFrame(type, !old_constant_pool_available_);
+    }
+  }
+
+  ~FrameAndConstantPoolScope() {
+    masm_->LeaveFrame(type_);
+    masm_->set_has_frame(old_has_frame_);
+    if (FLAG_enable_embedded_constant_pool) {
+      masm_->set_constant_pool_available(old_constant_pool_available_);
+    }
+  }
+
+  // Normally we generate the leave-frame code when this object goes
+  // out of scope.  Sometimes we may need to generate the code somewhere else
+  // in addition.  Calling this will achieve that, but the object stays in
+  // scope, the MacroAssembler is still marked as being in a frame scope, and
+  // the code will be generated again when it goes out of scope.
+  void GenerateLeaveFrame() {
+    DCHECK(type_ != StackFrame::MANUAL && type_ != StackFrame::NONE);
+    masm_->LeaveFrame(type_);
+  }
+
+ private:
+  MacroAssembler* masm_;
+  StackFrame::Type type_;
+  bool old_has_frame_;
+  bool old_constant_pool_available_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(FrameAndConstantPoolScope);
+};
+
+// Class for scoping the the unavailability of constant pool access.
+class ConstantPoolUnavailableScope {
+ public:
+  explicit ConstantPoolUnavailableScope(Assembler* assembler)
+      : assembler_(assembler),
+        old_constant_pool_available_(FLAG_enable_embedded_constant_pool &&
+                                     assembler->is_constant_pool_available()) {
+    if (FLAG_enable_embedded_constant_pool) {
+      assembler->set_constant_pool_available(false);
+    }
+  }
+  ~ConstantPoolUnavailableScope() {
+    if (FLAG_enable_embedded_constant_pool) {
+      assembler_->set_constant_pool_available(old_constant_pool_available_);
+    }
+  }
+
+ private:
+  Assembler* assembler_;
+  int old_constant_pool_available_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ConstantPoolUnavailableScope);
+};
+
+class AllowExternalCallThatCantCauseGC : public FrameScope {
+ public:
+  explicit AllowExternalCallThatCantCauseGC(MacroAssembler* masm)
+      : FrameScope(masm, StackFrame::NONE) {}
+};
+
+// Prevent the use of the RootArray during the lifetime of this
+// scope object.
+class NoRootArrayScope {
+ public:
+  explicit NoRootArrayScope(TurboAssembler* masm)
+      : masm_(masm), old_value_(masm->root_array_available()) {
+    masm->set_root_array_available(false);
+  }
+
+  ~NoRootArrayScope() { masm_->set_root_array_available(old_value_); }
+
+ private:
+  TurboAssembler* masm_;
+  bool old_value_;
+};
+
+// Wrapper class for passing expected and actual parameter counts as
+// either registers or immediate values. Used to make sure that the
+// caller provides exactly the expected number of parameters to the
+// callee.
+class ParameterCount {
+ public:
+  explicit ParameterCount(Register reg) : reg_(reg), immediate_(0) {}
+  explicit ParameterCount(uint16_t imm) : reg_(no_reg), immediate_(imm) {}
+
+  bool is_reg() const { return reg_.is_valid(); }
+  bool is_immediate() const { return !is_reg(); }
+
+  Register reg() const {
+    DCHECK(is_reg());
+    return reg_;
+  }
+  uint16_t immediate() const {
+    DCHECK(is_immediate());
+    return immediate_;
+  }
+
+ private:
+  const Register reg_;
+  const uint16_t immediate_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_CODEGEN_MACRO_ASSEMBLER_H_