Use direct jump and call instruction for X64 when the deoptimization entries are in the code range

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 543 matching lines @@
   }
 
   // This sets the branch destination (which is a load instruction on x64).
   // This is for calls and branches to runtime code.
   inline static void set_external_target_at(Address instruction_payload,
                                             Address target) {
     *reinterpret_cast<Address*>(instruction_payload) = target;
   }
 
   inline Handle<Object> code_target_object_handle_at(Address pc);
+  inline Address runtime_entry_at(Address pc);

[danno, 2013/03/08 09:16:30]

is this used any where? if not, please remove.

[haitao.feng, 2013/03/08 12:25:59]

It is used by target_runtime_entry. 

On 2013/03/08 09:16:30, danno wrote:

   // Number of bytes taken up by the branch target in the code.
   static const int kSpecialTargetSize = 4;  // Use 32-bit displacement.
   // Distance between the address of the code target in the call instruction
   // and the return address pushed on the stack.
   static const int kCallTargetAddressOffset = 4;  // Use 32-bit displacement.
   // Distance between the start of the JS return sequence and where the
   // 32-bit displacement of a near call would be, relative to the pushed
   // return address.  TODO: Use return sequence length instead.
   // Should equal Debug::kX64JSReturnSequenceLength - kCallTargetAddressOffset;
   static const int kPatchReturnSequenceAddressOffset = 13 - 4;
@@ skipping 599 matching lines @@
   // bind(&L);   // illegal: a label may be bound only once
   //
   // Note: The same Label can be used for forward and backward branches
   // but it may be bound only once.
 
   void bind(Label* L);  // binds an unbound label L to the current code position
 
   // Calls
   // Call near relative 32-bit displacement, relative to next instruction.
   void call(Label* L);
+  void call(Address entry, RelocInfo::Mode rmode);
   void call(Handle<Code> target,
             RelocInfo::Mode rmode = RelocInfo::CODE_TARGET,
             TypeFeedbackId ast_id = TypeFeedbackId::None());
 
   // Calls directly to the given address using a relative offset.
   // Should only ever be used in Code objects for calls within the
   // same Code object. Should not be used when generating new code (use labels),
   // but only when patching existing code.
   void call(Address target);
 
   // Call near absolute indirect, address in register
   void call(Register adr);
 
   // Call near indirect
   void call(const Operand& operand);
 
   // Jumps
   // Jump short or near relative.
   // Use a 32-bit signed displacement.
   // Unconditional jump to L
   void jmp(Label* L, Label::Distance distance = Label::kFar);
+  void jmp(Address entry, RelocInfo::Mode rmode);
   void jmp(Handle<Code> target, RelocInfo::Mode rmode);
 
   // Jump near absolute indirect (r64)
   void jmp(Register adr);
 
   // Jump near absolute indirect (m64)
   void jmp(const Operand& src);
 
   // Conditional jumps
   void j(Condition cc,
          Label* L,
          Label::Distance distance = Label::kFar);
+  void j(Condition cc, Address entry, RelocInfo::Mode rmode);
   void j(Condition cc, Handle<Code> target, RelocInfo::Mode rmode);
 
   // Floating-point operations
   void fld(int i);
 
   void fld1();
   void fldz();
   void fldpi();
   void fldln2();
 
@@ skipping 197 matching lines @@
   // code emission
   void GrowBuffer();
 
   void emit(byte x) { *pc_++ = x; }
   inline void emitl(uint32_t x);
   inline void emitq(uint64_t x, RelocInfo::Mode rmode);
   inline void emitw(uint16_t x);
   inline void emit_code_target(Handle<Code> target,
                                RelocInfo::Mode rmode,
                                TypeFeedbackId ast_id = TypeFeedbackId::None());
+  inline void emit_runtime_entry(Address entry, RelocInfo::Mode rmode);
   void emit(Immediate x) { emitl(x.value_); }
 
   // Emits a REX prefix that encodes a 64-bit operand size and
   // the top bit of both register codes.
   // High bit of reg goes to REX.R, high bit of rm_reg goes to REX.B.
   // REX.W is set.
   inline void emit_rex_64(XMMRegister reg, Register rm_reg);
   inline void emit_rex_64(Register reg, XMMRegister rm_reg);
   inline void emit_rex_64(Register reg, Register rm_reg);
 
@@ skipping 188 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_