Added SourceDestAddrInstruction

Author: atrick

SwiftCompilerSources/Sources/SIL/Instruction.swift

@@ -307,9 +307,18 @@ final public class AssignByWrapperInst : Instruction {}
 
 final public class AssignOrInitInst : Instruction {}
 
-final public class CopyAddrInst : Instruction {
+/// Instruction that copy or move from a source to destination address.
+public protocol SourceDestAddrInstruction : Instruction {
+  var sourceOperand: Operand { get }
+  var destinationOperand: Operand { get }
+}
+
+extension SourceDestAddrInstruction {
   public var sourceOperand: Operand { return operands[0] }
   public var destinationOperand: Operand { return operands[1] }
+}
+
+final public class CopyAddrInst : Instruction, SourceDestAddrInstruction {
   public var source: Value { return sourceOperand.value }
   public var destination: Value { return destinationOperand.value }
 
@@ -321,9 +330,7 @@ final public class CopyAddrInst : Instruction {
   }
 }
 
-final public class ExplicitCopyAddrInst : Instruction {
-  public var sourceOperand: Operand { return operands[0] }
-  public var destinationOperand: Operand { return operands[1] }
+final public class ExplicitCopyAddrInst : Instruction, SourceDestAddrInstruction {
   public var source: Value { return sourceOperand.value }
   public var destination: Value { return destinationOperand.value }
 }
@@ -583,7 +590,7 @@ class UncheckedRefCastInst : SingleValueInstruction, ConversionInstruction {
 }
 
 final public
-class UncheckedRefCastAddrInst : Instruction {}
+class UncheckedRefCastAddrInst : Instruction, SourceDestAddrInstruction {}
 
 final public class UncheckedAddrCastInst : SingleValueInstruction, UnaryInstruction {
   public var fromAddress: Value { operand.value }
@@ -1020,8 +1027,7 @@ final public class IsEscapingClosureInst : SingleValueInstruction, UnaryInstruct
 final public
 class MarkUnresolvedNonCopyableValueInst : SingleValueInstruction, UnaryInstruction {}
 
-final public
-  class MarkUnresolvedMoveAddrInst : Instruction {}
+final public class MarkUnresolvedMoveAddrInst : Instruction, SourceDestAddrInstruction {}
 
 final public
 class CopyableToMoveOnlyWrapperAddrInst : SingleValueInstruction, UnaryInstruction {}