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diff --git a/js/src/jit/arm/disasm/Disasm-arm.h b/js/src/jit/arm/disasm/Disasm-arm.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ */
+// Copyright 2007-2008 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 jit_arm_disasm_Disasm_arm_h
+#define jit_arm_disasm_Disasm_arm_h
+
+#ifdef JS_DISASM_ARM
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Types.h"
+
+#include <stdio.h>
+
+namespace js {
+namespace jit {
+namespace disasm {
+
+typedef unsigned char byte;
+
+// A reasonable (ie, safe) buffer size for the disassembly of a single instruction.
+const int ReasonableBufferSize = 256;
+
+// Vector as used by the original code to allow for minimal modification.
+// Functions exactly like a character array with helper methods.
+template <typename T>
+class V8Vector {
+ public:
+ V8Vector() : start_(nullptr), length_(0) {}
+ V8Vector(T* data, int length) : start_(data), length_(length) {
+ MOZ_ASSERT(length == 0 || (length > 0 && data != nullptr));
+ }
+
+ // Returns the length of the vector.
+ int length() const { return length_; }
+
+ // Returns the pointer to the start of the data in the vector.
+ T* start() const { return start_; }
+
+ // Access individual vector elements - checks bounds in debug mode.
+ T& operator[](int index) const {
+ MOZ_ASSERT(0 <= index && index < length_);
+ return start_[index];
+ }
+
+ inline V8Vector<T> operator+(int offset) {
+ MOZ_ASSERT(offset < length_);
+ return V8Vector<T>(start_ + offset, length_ - offset);
+ }
+
+ private:
+ T* start_;
+ int length_;
+};
+
+
+template <typename T, int kSize>
+class EmbeddedVector : public V8Vector<T> {
+ public:
+ EmbeddedVector() : V8Vector<T>(buffer_, kSize) { }
+
+ explicit EmbeddedVector(T initial_value) : V8Vector<T>(buffer_, kSize) {
+ for (int i = 0; i < kSize; ++i) {
+ buffer_[i] = initial_value;
+ }
+ }
+
+ // When copying, make underlying Vector to reference our buffer.
+ EmbeddedVector(const EmbeddedVector& rhs)
+ : V8Vector<T>(rhs) {
+ MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+ this->set_start(buffer_);
+ }
+
+ EmbeddedVector& operator=(const EmbeddedVector& rhs) {
+ if (this == &rhs) return *this;
+ V8Vector<T>::operator=(rhs);
+ MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+ this->set_start(buffer_);
+ return *this;
+ }
+
+ private:
+ T buffer_[kSize];
+};
+
+
+// Interface and default implementation for converting addresses and
+// register-numbers to text. The default implementation is machine
+// specific.
+class NameConverter {
+ public:
+ virtual ~NameConverter() {}
+ virtual const char* NameOfCPURegister(int reg) const;
+ virtual const char* NameOfByteCPURegister(int reg) const;
+ virtual const char* NameOfXMMRegister(int reg) const;
+ virtual const char* NameOfAddress(byte* addr) const;
+ virtual const char* NameOfConstant(byte* addr) const;
+ virtual const char* NameInCode(byte* addr) const;
+
+ protected:
+ EmbeddedVector<char, 128> tmp_buffer_;
+};
+
+
+// A generic Disassembler interface
+class Disassembler {
+ public:
+ // Caller deallocates converter.
+ explicit Disassembler(const NameConverter& converter);
+
+ virtual ~Disassembler();
+
+ // Writes one disassembled instruction into 'buffer' (0-terminated).
+ // Returns the length of the disassembled machine instruction in bytes.
+ int InstructionDecode(V8Vector<char> buffer, uint8_t* instruction);
+
+ // Returns -1 if instruction does not mark the beginning of a constant pool,
+ // or the number of entries in the constant pool beginning here.
+ int ConstantPoolSizeAt(byte* instruction);
+
+ // Write disassembly into specified file 'f' using specified NameConverter
+ // (see constructor).
+ static void Disassemble(FILE* f, uint8_t* begin, uint8_t* end);
+ private:
+ const NameConverter& converter_;
+
+ // Disallow implicit constructors.
+ Disassembler() = delete;
+ Disassembler(const Disassembler&) = delete;
+ void operator=(const Disassembler&) = delete;
+};
+
+} // namespace disasm
+} // namespace jit
+} // namespace js
+
+#endif // JS_DISASM_ARM
+
+#endif // jit_arm_disasm_Disasm_arm_h