| /* -*- 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 |