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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef VM_CONSTANTS_IA32_H_
#define VM_CONSTANTS_IA32_H_
#include "platform/assert.h"
namespace dart {
enum Register {
kFirstFreeCpuRegister = 0,
EAX = 0,
ECX = 1,
EDX = 2,
EBX = 3,
ESP = 4,
EBP = 5,
ESI = 6,
EDI = 7,
kLastFreeCpuRegister = 7,
kNumberOfCpuRegisters = 8,
kNoRegister = -1 // Signals an illegal register.
};
enum ByteRegister {
AL = 0,
CL = 1,
DL = 2,
BL = 3,
AH = 4,
CH = 5,
DH = 6,
BH = 7,
kNoByteRegister = -1 // Signals an illegal register.
};
enum XmmRegister {
XMM0 = 0,
XMM1 = 1,
XMM2 = 2,
XMM3 = 3,
XMM4 = 4,
XMM5 = 5,
XMM6 = 6,
XMM7 = 7,
kNumberOfXmmRegisters = 8,
kNoXmmRegister = -1 // Signals an illegal register.
};
// Architecture independent aliases.
typedef XmmRegister FpuRegister;
const FpuRegister FpuTMP = XMM0;
const int kNumberOfFpuRegisters = kNumberOfXmmRegisters;
const FpuRegister kNoFpuRegister = kNoXmmRegister;
// Register aliases.
const Register TMP = kNoRegister; // No scratch register used by assembler.
const Register TMP2 = kNoRegister; // No second assembler scratch register.
const Register CTX = EDI; // Location of current context at method entry.
const Register CODE_REG = EDI;
const Register PP = kNoRegister; // No object pool pointer.
const Register SPREG = ESP; // Stack pointer register.
const Register FPREG = EBP; // Frame pointer register.
const Register ICREG = ECX; // IC data register.
const Register ARGS_DESC_REG = EDX; // Arguments descriptor register.
const Register THR = ESI; // Caches current thread in generated code.
// Exception object is passed in this register to the catch handlers when an
// exception is thrown.
const Register kExceptionObjectReg = EAX;
// Stack trace object is passed in this register to the catch handlers when
// an exception is thrown.
const Register kStackTraceObjectReg = EDX;
enum ScaleFactor {
TIMES_1 = 0,
TIMES_2 = 1,
TIMES_4 = 2,
TIMES_8 = 3,
TIMES_16 = 4,
TIMES_HALF_WORD_SIZE = kWordSizeLog2 - 1
};
enum Condition {
OVERFLOW = 0,
NO_OVERFLOW = 1,
BELOW = 2,
ABOVE_EQUAL = 3,
EQUAL = 4,
NOT_EQUAL = 5,
BELOW_EQUAL = 6,
ABOVE = 7,
SIGN = 8,
NOT_SIGN = 9,
PARITY_EVEN = 10,
PARITY_ODD = 11,
LESS = 12,
GREATER_EQUAL = 13,
LESS_EQUAL = 14,
GREATER = 15,
ZERO = EQUAL,
NOT_ZERO = NOT_EQUAL,
NEGATIVE = SIGN,
POSITIVE = NOT_SIGN,
CARRY = BELOW,
NOT_CARRY = ABOVE_EQUAL
};
class Instr {
public:
static const uint8_t kHltInstruction = 0xF4;
// We prefer not to use the int3 instruction since it conflicts with gdb.
static const uint8_t kBreakPointInstruction = kHltInstruction;
static const int kBreakPointInstructionSize = 1;
bool IsBreakPoint() {
ASSERT(kBreakPointInstructionSize == 1);
return (*reinterpret_cast<const uint8_t*>(this)) == kBreakPointInstruction;
}
// Instructions are read out of a code stream. The only way to get a
// reference to an instruction is to convert a pointer. There is no way
// to allocate or create instances of class Instr.
// Use the At(pc) function to create references to Instr.
static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
private:
DISALLOW_ALLOCATION();
// We need to prevent the creation of instances of class Instr.
DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
};
// The largest multibyte nop we will emit. This could go up to 15 if it
// becomes important to us.
const int MAX_NOP_SIZE = 8;
} // namespace dart
#endif // VM_CONSTANTS_IA32_H_