1 /*
   2  * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2007, 2008, 2009 Red Hat, Inc.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef CPU_ZERO_ASSEMBLER_ZERO_HPP
  27 #define CPU_ZERO_ASSEMBLER_ZERO_HPP
  28 
  29 // In normal, CPU-specific ports of HotSpot these two classes are used
  30 // for generating assembly language.  We don't do any of this in zero,
  31 // of course, but we do sneak entry points around in CodeBuffers so we
  32 // generate those here.
  33 
  34 class Assembler : public AbstractAssembler {
  35  public:
  36   Assembler(CodeBuffer* code) : AbstractAssembler(code) {}
  37 
  38  public:
  39   void pd_patch_instruction(address branch, address target, const char* file, int line);
  40 
  41   //---<  calculate length of instruction  >---
  42   static unsigned int instr_len(unsigned char *instr) { return 1; }
  43 
  44   //---<  longest instructions  >---
  45   static unsigned int instr_maxlen() { return 1; }
  46 };
  47 
  48 class MacroAssembler : public Assembler {
  49  public:
  50   MacroAssembler(CodeBuffer* code) : Assembler(code) {}
  51 
  52  public:
  53   void align(int modulus);
  54   void bang_stack_with_offset(int offset);
  55   bool needs_explicit_null_check(intptr_t offset);
  56   bool uses_implicit_null_check(void* address);
  57   RegisterOrConstant delayed_value_impl(intptr_t* delayed_value_addr,
  58                                         Register tmp, int offset);
  59  public:
  60   void advance(int bytes);
  61   void store_oop(jobject obj);
  62   void store_Metadata(Metadata* obj);
  63 };
  64 
  65 address ShouldNotCallThisStub();
  66 address ShouldNotCallThisEntry();
  67 
  68 #endif // CPU_ZERO_ASSEMBLER_ZERO_HPP