Add support for object pool

runtime/vm/instructions_mips.h

 // 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.
 // Classes that describe assembly patterns as used by inline caches.
 
 #ifndef VM_INSTRUCTIONS_MIPS_H_
 #define VM_INSTRUCTIONS_MIPS_H_
 
 #ifndef VM_INSTRUCTIONS_H_
 #error Do not include instructions_mips.h directly; use instructions.h instead.
 #endif
 
 #include "vm/allocation.h"
+#include "vm/object.h"
 
 namespace dart {
 
 // Forward declarations.
 class RawClass;
 class Immediate;
 class RawObject;
 
 // Abstract class for all instruction pattern classes.
 class InstructionPattern : public ValueObject {
  public:
-  explicit InstructionPattern(uword pc) : start_(pc) {
+  explicit InstructionPattern(uword pc) : end_(pc) {
     ASSERT(pc != 0);
   }
-  virtual ~InstructionPattern() {}
+  virtual ~InstructionPattern() { }
 
-  // Call to check if the instruction pattern at 'pc' match the instruction.
+  // Check if the instruction ending at 'end_' matches the expected pattern.
   virtual bool IsValid() const {
     return TestBytesWith(pattern(), pattern_length_in_bytes());
   }
 
   // 'pattern' returns the expected byte pattern in form of an integer array
   // with length of 'pattern_length_in_bytes'. A '-1' element means 'any byte'.
   virtual const int* pattern() const = 0;
   virtual int pattern_length_in_bytes() const = 0;
 
  protected:
-  uword start() const { return start_; }
+  uword end() const { return end_; }
 
  private:
-  // Returns true if the 'num_bytes' bytes at 'start_' correspond to
-  // array of integers 'data'. 'data' elements are either a byte or -1, which
-  // represents any byte.
+  // Returns true if the 'num_bytes' bytes at 'num_bytes' before 'end_'
+  // correspond to array of integers 'data'. 'data' elements are either a byte
+  // or -1, which represents any byte.
   bool TestBytesWith(const int* data, int num_bytes) const;
 
-  const uword start_;
+  const uword end_;
 
   DISALLOW_COPY_AND_ASSIGN(InstructionPattern);
 };
 
 
-class CallOrJumpPattern : public InstructionPattern {
+class CallPattern : public InstructionPattern {
  public:
+  CallPattern(uword pc, const Code& code)
+      : InstructionPattern(pc), code_(code) { }
+
+  static const int kLengthInBytes = 1*kWordSize;
+
   virtual int pattern_length_in_bytes() const {
     return kLengthInBytes;
   }
   uword TargetAddress() const;
   void SetTargetAddress(uword new_target) const;
 
- protected:
-  explicit CallOrJumpPattern(uword pc) : InstructionPattern(pc) {}
-  static const int kLengthInBytes = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CallOrJumpPattern);
-};
-
-
-class CallPattern : public CallOrJumpPattern {
- public:
-  explicit CallPattern(uword pc) : CallOrJumpPattern(pc) {}
-  static int InstructionLength() {
-    return kLengthInBytes;
-  }
-
  private:
   virtual const int* pattern() const;
 
+  const Code& code_;
+
   DISALLOW_COPY_AND_ASSIGN(CallPattern);
 };
 
 
-class JumpPattern : public CallOrJumpPattern {
+class JumpPattern : public InstructionPattern {
  public:
-  explicit JumpPattern(uword pc) : CallOrJumpPattern(pc) {}
+  explicit JumpPattern(uword pc) : InstructionPattern(pc) { }
+
+  static const int kLengthInBytes = 3*kWordSize;
+
+  virtual int pattern_length_in_bytes() const {
+    return kLengthInBytes;
+  }
+  uword TargetAddress() const;
+  void SetTargetAddress(uword new_target) const;
 
  private:
   virtual const int* pattern() const;
 
   DISALLOW_COPY_AND_ASSIGN(JumpPattern);
 };
 
 }  // namespace dart
 
 #endif  // VM_INSTRUCTIONS_MIPS_H_