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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*/
// 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
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