JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2016 SAP SE. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * 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.
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#ifndef CPU_S390_C1_DEFS_S390_HPP
#define CPU_S390_C1_DEFS_S390_HPP

// Native word offsets from memory address (big endian).
enum {
  pd_lo_word_offset_in_bytes = BytesPerInt,
  pd_hi_word_offset_in_bytes = 0
};

// Explicit rounding operations are not required to implement the strictFP mode.
enum {
  pd_strict_fp_requires_explicit_rounding = false
};

// registers
enum {
  pd_nof_cpu_regs_frame_map = 16,  // Number of registers used during code emission.
  // Treat all registers as caller save (values of callee save are hard to find if caller is in runtime).
  // unallocated: Z_thread, Z_fp, Z_SP, Z_R0_scratch, Z_R1_scratch, Z_R14
  pd_nof_cpu_regs_unallocated = 6,
  pd_nof_caller_save_cpu_regs_frame_map = pd_nof_cpu_regs_frame_map - pd_nof_cpu_regs_unallocated,  // Number of cpu registers killed by calls.
  pd_nof_cpu_regs_reg_alloc = pd_nof_caller_save_cpu_regs_frame_map,  // Number of registers that are visible to register allocator.
  pd_nof_cpu_regs_linearscan = pd_nof_cpu_regs_frame_map,// Number of registers visible linear scan.
  pd_first_cpu_reg = 0,
  pd_last_cpu_reg  = 9, // Others are unallocated (see FrameMap::initialize()).

  pd_nof_fpu_regs_frame_map = 16,  // Number of registers used during code emission.
  pd_nof_fcpu_regs_unallocated = 1, // Leave Z_F15 unallocated and use it as scratch register.
  pd_nof_caller_save_fpu_regs_frame_map = pd_nof_fpu_regs_frame_map - pd_nof_fcpu_regs_unallocated,  // Number of fpu registers killed by calls.
  pd_nof_fpu_regs_reg_alloc = pd_nof_caller_save_fpu_regs_frame_map,  // Number of registers that are visible to register allocator.
  pd_nof_fpu_regs_linearscan = pd_nof_fpu_regs_frame_map, // Number of registers visible to linear scan.
  pd_first_fpu_reg = pd_nof_cpu_regs_frame_map,

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