Initial revision of assembler for x64.

runtime/vm/constants_x64.h

Index: runtime/vm/constants_x64.h
===================================================================
--- runtime/vm/constants_x64.h	(revision 1937)
+++ runtime/vm/constants_x64.h	(working copy)
@@ -28,6 +28,102 @@
   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.
+};
+
+
+// Register aliases.
+const Register CTX = R12;  // Caches current context in generated code.
+
+// Exception object is passed in this register to the catch handlers when an
+// exception is thrown.
+const Register kExceptionObjectReg = RAX;
+
+// Stack trace object is passed in this register to the catch handlers when
+// an exception is thrown.
+const Register kStackTraceObjectReg = RDX;
+
+enum ScaleFactor {
+  TIMES_1 = 0,
+  TIMES_2 = 1,
+  TIMES_4 = 2,
+  TIMES_8 = 3
+};
+
+
+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
+};
+
+
+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);
+};
+
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_X64_H_