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4c0f559d23
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@15 260f80e4-7a28-3924-810f-c04153c831b5
125 lines
2.7 KiB
C++
125 lines
2.7 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_CONSTANTS_IA32_H_
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#define VM_CONSTANTS_IA32_H_
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#include "vm/assert.h"
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namespace dart {
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enum Register {
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EAX = 0,
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ECX = 1,
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EDX = 2,
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EBX = 3,
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ESP = 4,
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EBP = 5,
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ESI = 6,
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EDI = 7,
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kNumberOfCpuRegisters = 8,
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kFirstByteUnsafeRegister = 4,
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kNoRegister = -1 // Signals an illegal register.
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};
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enum ByteRegister {
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AL = 0,
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CL = 1,
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DL = 2,
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BL = 3,
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AH = 4,
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CH = 5,
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DH = 6,
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BH = 7,
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kNoByteRegister = -1 // Signals an illegal register.
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};
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enum XmmRegister {
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XMM0 = 0,
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XMM1 = 1,
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XMM2 = 2,
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XMM3 = 3,
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XMM4 = 4,
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XMM5 = 5,
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XMM6 = 6,
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XMM7 = 7,
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kNumberOfXmmRegisters = 8,
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kNoXmmRegister = -1 // Signals an illegal register.
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};
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// Register aliases.
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const Register CTX = ESI; // Caches current context in generated code.
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// Exception object is passed in this register to the catch handlers when an
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// exception is thrown.
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const Register kExceptionObjectReg = EAX;
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// Stack trace object is passed in this register to the catch handlers when
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// an exception is thrown.
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const Register kStackTraceObjectReg = EDX;
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enum ScaleFactor {
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TIMES_1 = 0,
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TIMES_2 = 1,
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TIMES_4 = 2,
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TIMES_8 = 3
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};
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enum Condition {
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OVERFLOW = 0,
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NO_OVERFLOW = 1,
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BELOW = 2,
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ABOVE_EQUAL = 3,
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EQUAL = 4,
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NOT_EQUAL = 5,
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BELOW_EQUAL = 6,
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ABOVE = 7,
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SIGN = 8,
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NOT_SIGN = 9,
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PARITY_EVEN = 10,
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PARITY_ODD = 11,
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LESS = 12,
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GREATER_EQUAL = 13,
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LESS_EQUAL = 14,
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GREATER = 15,
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ZERO = EQUAL,
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NOT_ZERO = NOT_EQUAL,
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NEGATIVE = SIGN,
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POSITIVE = NOT_SIGN
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};
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class Instr {
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public:
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static const uint8_t kHltInstruction = 0xF4;
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// We prefer not to use the int3 instruction since it conflicts with gdb.
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static const uint8_t kBreakPointInstruction = kHltInstruction;
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static const int kBreakPointInstructionSize = 1;
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bool IsBreakPoint() {
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ASSERT(kBreakPointInstructionSize == 1);
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return (*reinterpret_cast<const uint8_t*>(this)) == kBreakPointInstruction;
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}
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// Instructions are read out of a code stream. The only way to get a
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// reference to an instruction is to convert a pointer. There is no way
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// to allocate or create instances of class Instr.
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// Use the At(pc) function to create references to Instr.
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static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
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private:
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DISALLOW_ALLOCATION();
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// We need to prevent the creation of instances of class Instr.
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DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
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};
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} // namespace dart
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#endif // VM_CONSTANTS_IA32_H_
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