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/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2016 SAP SE. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef CPU_S390_VM_REGISTERSAVER_S390_HPP
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#define CPU_S390_VM_REGISTERSAVER_S390_HPP
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class RegisterSaver {
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// Used for saving volatile registers.
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// Class declaration moved to separate file to make it available elsewhere.
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// Implementation remains in sharedRuntime_s390.cpp
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public:
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// Set of registers to be saved.
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typedef enum {
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all_registers,
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all_registers_except_r2,
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all_integer_registers,
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all_volatile_registers, // According to ABI calling convention.
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arg_registers
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} RegisterSet;
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// Boolean flags to force only argument registers to be saved.
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static int live_reg_save_size(RegisterSet reg_set);
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static int live_reg_frame_size(RegisterSet reg_set);
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// Specify the register that should be stored as the return pc in the current frame.
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static OopMap* save_live_registers(MacroAssembler* masm, RegisterSet reg_set, Register return_pc = Z_R14);
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static void restore_live_registers(MacroAssembler* masm, RegisterSet reg_set);
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// Generate the OopMap (again, regs where saved before).
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static OopMap* generate_oop_map(MacroAssembler* masm, RegisterSet reg_set);
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// During deoptimization only the result register need to be restored
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// all the other values have already been extracted.
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static void restore_result_registers(MacroAssembler* masm);
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// Constants and data structures:
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typedef enum {
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int_reg = 0,
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float_reg = 1,
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excluded_reg = 2, // Not saved/restored.
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} RegisterType;
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typedef enum {
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reg_size = 8,
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half_reg_size = reg_size / 2,
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} RegisterConstants;
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// Remember type, number, and VMReg.
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typedef struct {
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RegisterType reg_type;
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int reg_num;
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VMReg vmreg;
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} LiveRegType;
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};
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#endif // CPU_S390_VM_REGISTERSAVER_S390_HPP
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