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//===-- Opcode.h ------------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef lldb_Opcode_h
#define lldb_Opcode_h
// C Includes
#include <string.h>
// C++ Includes
// Other libraries and framework includes
#include "llvm/Support/MathExtras.h"
// Project includes
#include "lldb/Host/Endian.h"
#include "lldb/lldb-public.h"
namespace lldb
{
class SBInstruction;
}
namespace lldb_private {
class Opcode
{
public:
enum Type
{
eTypeInvalid,
eType8,
eType16,
eType16_2, // a 32-bit Thumb instruction, made up of two words
eType32,
eType64,
eTypeBytes
};
Opcode () : m_byte_order (lldb::eByteOrderInvalid), m_type (eTypeInvalid)
{
}
Opcode (uint8_t inst, lldb::ByteOrder order) : m_byte_order (order), m_type (eType8)
{
m_data.inst8 = inst;
}
Opcode (uint16_t inst, lldb::ByteOrder order) : m_byte_order (order), m_type (eType16)
{
m_data.inst16 = inst;
}
Opcode (uint32_t inst, lldb::ByteOrder order) : m_byte_order (order), m_type (eType32)
{
m_data.inst32 = inst;
}
Opcode (uint64_t inst, lldb::ByteOrder order) : m_byte_order (order), m_type (eType64)
{
m_data.inst64 = inst;
}
Opcode (uint8_t *bytes, size_t length) : m_byte_order (lldb::eByteOrderInvalid)
{
SetOpcodeBytes (bytes, length);
}
void
Clear()
{
m_byte_order = lldb::eByteOrderInvalid;
m_type = Opcode::eTypeInvalid;
}
Opcode::Type
GetType () const
{
return m_type;
}
uint8_t
GetOpcode8 (uint8_t invalid_opcode = UINT8_MAX) const
{
switch (m_type)
{
case Opcode::eTypeInvalid: break;
case Opcode::eType8: return m_data.inst8;
case Opcode::eType16: break;
case Opcode::eType16_2: break;
case Opcode::eType32: break;
case Opcode::eType64: break;
case Opcode::eTypeBytes: break;
}
return invalid_opcode;
}
uint16_t
GetOpcode16 (uint16_t invalid_opcode = UINT16_MAX) const
{
switch (m_type)
{
case Opcode::eTypeInvalid: break;
case Opcode::eType8: return m_data.inst8;
case Opcode::eType16: return GetEndianSwap() ? llvm::ByteSwap_16(m_data.inst16) : m_data.inst16;
case Opcode::eType16_2: break;
case Opcode::eType32: break;
case Opcode::eType64: break;
case Opcode::eTypeBytes: break;
}
return invalid_opcode;
}
uint32_t
GetOpcode32 (uint32_t invalid_opcode = UINT32_MAX) const
{
switch (m_type)
{
case Opcode::eTypeInvalid: break;
case Opcode::eType8: return m_data.inst8;
case Opcode::eType16: return GetEndianSwap() ? llvm::ByteSwap_16(m_data.inst16) : m_data.inst16;
case Opcode::eType16_2: // passthrough
case Opcode::eType32: return GetEndianSwap() ? llvm::ByteSwap_32(m_data.inst32) : m_data.inst32;
case Opcode::eType64: break;
case Opcode::eTypeBytes: break;
}
return invalid_opcode;
}
uint64_t
GetOpcode64 (uint64_t invalid_opcode = UINT64_MAX) const
{
switch (m_type)
{
case Opcode::eTypeInvalid: break;
case Opcode::eType8: return m_data.inst8;
case Opcode::eType16: return GetEndianSwap() ? llvm::ByteSwap_16(m_data.inst16) : m_data.inst16;
case Opcode::eType16_2: // passthrough
case Opcode::eType32: return GetEndianSwap() ? llvm::ByteSwap_32(m_data.inst32) : m_data.inst32;
case Opcode::eType64: return GetEndianSwap() ? llvm::ByteSwap_64(m_data.inst64) : m_data.inst64;
case Opcode::eTypeBytes: break;
}
return invalid_opcode;
}
void
SetOpcode8 (uint8_t inst, lldb::ByteOrder order)
{
m_type = eType8;
m_data.inst8 = inst;
m_byte_order = order;
}
void
SetOpcode16 (uint16_t inst, lldb::ByteOrder order)
{
m_type = eType16;
m_data.inst16 = inst;
m_byte_order = order;
}
void
SetOpcode16_2 (uint32_t inst, lldb::ByteOrder order)
{
m_type = eType16_2;
m_data.inst32 = inst;
m_byte_order = order;
}
void
SetOpcode32 (uint32_t inst, lldb::ByteOrder order)
{
m_type = eType32;
m_data.inst32 = inst;
m_byte_order = order;
}
void
SetOpcode64 (uint64_t inst, lldb::ByteOrder order)
{
m_type = eType64;
m_data.inst64 = inst;
m_byte_order = order;
}
void
SetOpcodeBytes (const void *bytes, size_t length)
{
if (bytes && length > 0)
{
m_type = eTypeBytes;
m_data.inst.length = length;
assert (length < sizeof (m_data.inst.bytes));
memcpy (m_data.inst.bytes, bytes, length);
m_byte_order = lldb::eByteOrderInvalid;
}
else
{
m_type = eTypeInvalid;
m_data.inst.length = 0;
}
}
int
Dump (Stream *s, uint32_t min_byte_width);
const void *
GetOpcodeBytes () const
{
if (m_type == Opcode::eTypeBytes)
return m_data.inst.bytes;
return NULL;
}
uint32_t
GetByteSize () const
{
switch (m_type)
{
case Opcode::eTypeInvalid: break;
case Opcode::eType8: return sizeof(m_data.inst8);
case Opcode::eType16: return sizeof(m_data.inst16);
case Opcode::eType16_2: // passthrough
case Opcode::eType32: return sizeof(m_data.inst32);
case Opcode::eType64: return sizeof(m_data.inst64);
case Opcode::eTypeBytes: return m_data.inst.length;
}
return 0;
}
// Get the opcode exactly as it would be laid out in memory.
uint32_t
GetData (DataExtractor &data) const;
protected:
friend class lldb::SBInstruction;
const void *
GetOpcodeDataBytes () const
{
switch (m_type)
{
case Opcode::eTypeInvalid: break;
case Opcode::eType8: return &m_data.inst8;
case Opcode::eType16: return &m_data.inst16;
case Opcode::eType16_2: // passthrough
case Opcode::eType32: return &m_data.inst32;
case Opcode::eType64: return &m_data.inst64;
case Opcode::eTypeBytes: return m_data.inst.bytes;
}
return NULL;
}
lldb::ByteOrder
GetDataByteOrder () const;
bool
GetEndianSwap() const
{
return (m_byte_order == lldb::eByteOrderBig && lldb::endian::InlHostByteOrder() == lldb::eByteOrderLittle) ||
(m_byte_order == lldb::eByteOrderLittle && lldb::endian::InlHostByteOrder() == lldb::eByteOrderBig);
}
lldb::ByteOrder m_byte_order;
Opcode::Type m_type;
union
{
uint8_t inst8;
uint16_t inst16;
uint32_t inst32;
uint64_t inst64;
struct
{
uint8_t bytes[16]; // This must be big enough to handle any opcode for any supported target.
uint8_t length;
} inst;
} m_data;
};
} // namespace lldb_private
#endif // lldb_Opcode_h
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