includes: move Label out of assembler.h.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index cd5867689efe0efde0ced8c0998964465f6f5cf8..27aab0eec6eae8c0c2122a1beaf5fcc389fa40e5 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -40,6 +40,7 @@
 #include "src/deoptimize-reason.h"
 #include "src/globals.h"
 #include "src/isolate.h"
+#include "src/label.h"
 #include "src/log.h"
 #include "src/register-configuration.h"
 #include "src/runtime/runtime.h"
@@ -272,79 +273,6 @@ class CpuFeatures : public AllStatic {
 };
 
 
-// -----------------------------------------------------------------------------
-// Labels represent pc locations; they are typically jump or call targets.
-// After declaration, a label can be freely used to denote known or (yet)
-// unknown pc location. Assembler::bind() is used to bind a label to the
-// current pc. A label can be bound only once.
-
-class Label {
- public:
-  enum Distance {
-    kNear, kFar
-  };
-
-  INLINE(Label()) {
-    Unuse();
-    UnuseNear();
-  }
-
-  INLINE(~Label()) {
-    DCHECK(!is_linked());
-    DCHECK(!is_near_linked());
-  }
-
-  INLINE(void Unuse()) { pos_ = 0; }
-  INLINE(void UnuseNear()) { near_link_pos_ = 0; }
-
-  INLINE(bool is_bound() const) { return pos_ <  0; }
-  INLINE(bool is_unused() const) { return pos_ == 0 && near_link_pos_ == 0; }
-  INLINE(bool is_linked() const) { return pos_ >  0; }
-  INLINE(bool is_near_linked() const) { return near_link_pos_ > 0; }
-
-  // Returns the position of bound or linked labels. Cannot be used
-  // for unused labels.
-  int pos() const;
-  int near_link_pos() const { return near_link_pos_ - 1; }
-
- private:
-  // pos_ encodes both the binding state (via its sign)
-  // and the binding position (via its value) of a label.
-  //
-  // pos_ <  0  bound label, pos() returns the jump target position
-  // pos_ == 0  unused label
-  // pos_ >  0  linked label, pos() returns the last reference position
-  int pos_;
-
-  // Behaves like |pos_| in the "> 0" case, but for near jumps to this label.
-  int near_link_pos_;
-
-  void bind_to(int pos)  {
-    pos_ = -pos - 1;
-    DCHECK(is_bound());
-  }
-  void link_to(int pos, Distance distance = kFar) {
-    if (distance == kNear) {
-      near_link_pos_ = pos + 1;
-      DCHECK(is_near_linked());
-    } else {
-      pos_ = pos + 1;
-      DCHECK(is_linked());
-    }
-  }
-
-  friend class Assembler;
-  friend class Displacement;
-  friend class RegExpMacroAssemblerIrregexp;
-
-#if V8_TARGET_ARCH_ARM64
-  // On ARM64, the Assembler keeps track of pointers to Labels to resolve
-  // branches to distant targets. Copying labels would confuse the Assembler.
-  DISALLOW_COPY_AND_ASSIGN(Label);  // NOLINT
-#endif
-};
-
-
 enum SaveFPRegsMode { kDontSaveFPRegs, kSaveFPRegs };
 
 enum ArgvMode { kArgvOnStack, kArgvInRegister };