/*

 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef CPU_X86_VM_ASSEMBLER_X86_INLINE_HPP

#define CPU_X86_VM_ASSEMBLER_X86_INLINE_HPP

#include "asm/assembler.inline.hpp"

#include "asm/codeBuffer.hpp"

#include "code/codeCache.hpp"

#include "runtime/handles.inline.hpp"

inline void MacroAssembler::pd_patch_instruction(address branch, address target) {

  unsigned char op = branch[0];

  assert(op == 0xE8 /* call */ ||

         op == 0xE9 /* jmp */ ||

         op == 0xEB /* short jmp */ ||

         (op & 0xF0) == 0x70 /* short jcc */ ||

         op == 0x0F && (branch[1] & 0xF0) == 0x80 /* jcc */,

         "Invalid opcode at patch point");

  if (op == 0xEB || (op & 0xF0) == 0x70) {

    // short offset operators (jmp and jcc)

    char* disp = (char*) &branch[1];

    int imm8 = target - (address) &disp[1];

    guarantee(this->is8bit(imm8), "Short forward jump exceeds 8-bit offset");

    *disp = imm8;

  } else {

    int* disp = (int*) &branch[(op == 0x0F)? 2: 1];

    int imm32 = target - (address) &disp[1];

    *disp = imm32;

  }

}

#ifndef PRODUCT

inline void MacroAssembler::pd_print_patched_instruction(address branch) {

  const char* s;

  unsigned char op = branch[0];

  if (op == 0xE8) {

    s = "call";

  } else if (op == 0xE9 || op == 0xEB) {

    s = "jmp";

  } else if ((op & 0xF0) == 0x70) {

    s = "jcc";

  } else if (op == 0x0F) {

    s = "jcc";

  } else {

    s = "????";

  }

  tty->print("%s (unresolved)", s);

}

#endif // ndef PRODUCT

#ifndef _LP64

inline int Assembler::prefix_and_encode(int reg_enc, bool byteinst) { return reg_enc; }

inline int Assembler::prefixq_and_encode(int reg_enc) { return reg_enc; }

inline int Assembler::prefix_and_encode(int dst_enc, int src_enc, bool byteinst) { return dst_enc << 3 | src_enc; }

inline int Assembler::prefixq_and_encode(int dst_enc, int src_enc) { return dst_enc << 3 | src_enc; }

inline void Assembler::prefix(Register reg) {}

inline void Assembler::prefix(Address adr) {}

inline void Assembler::prefixq(Address adr) {}

inline void Assembler::prefix(Address adr, Register reg,  bool byteinst) {}

inline void Assembler::prefixq(Address adr, Register reg) {}

inline void Assembler::prefix(Address adr, XMMRegister reg) {}

inline void Assembler::prefixq(Address adr, XMMRegister reg) {}

#else

inline void Assembler::emit_long64(jlong x) {

  *(jlong*) _code_pos = x;

  _code_pos += sizeof(jlong);

  code_section()->set_end(_code_pos);

}

#endif // _LP64

#endif // CPU_X86_VM_ASSEMBLER_X86_INLINE_HPP