Mercurial > hg > truffle
annotate src/cpu/ppc/vm/interp_masm_ppc_64.cpp @ 14822:39daeb102dce
Baseline compiler emitPrologue.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 19 Mar 2014 17:07:22 +0100 |
parents | 67fa91961822 |
children | 58cf34613a72 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * Copyright 2012, 2013 SAP AG. All rights reserved. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 |
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27 #include "precompiled.hpp" |
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28 #include "asm/assembler.hpp" |
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29 #include "asm/macroAssembler.inline.hpp" |
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30 #include "interp_masm_ppc_64.hpp" |
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31 #include "interpreter/interpreterRuntime.hpp" |
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32 |
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33 #ifdef PRODUCT |
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34 #define BLOCK_COMMENT(str) // nothing |
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35 #else |
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36 #define BLOCK_COMMENT(str) block_comment(str) |
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37 #endif |
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38 |
14445 | 39 void InterpreterMacroAssembler::null_check_throw(Register a, int offset, Register temp_reg) { |
40 #ifdef CC_INTERP | |
41 address exception_entry = StubRoutines::throw_NullPointerException_at_call_entry(); | |
42 #else | |
43 address exception_entry = Interpreter::throw_NullPointerException_entry(); | |
44 #endif | |
45 MacroAssembler::null_check_throw(a, offset, temp_reg, exception_entry); | |
46 } | |
47 | |
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48 // Lock object |
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49 // |
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50 // Registers alive |
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51 // monitor - Address of the BasicObjectLock to be used for locking, |
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52 // which must be initialized with the object to lock. |
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53 // object - Address of the object to be locked. |
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54 // |
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55 void InterpreterMacroAssembler::lock_object(Register monitor, Register object) { |
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56 if (UseHeavyMonitors) { |
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57 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), |
14445 | 58 monitor, /*check_for_exceptions=*/true CC_INTERP_ONLY(&& false)); |
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59 } else { |
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60 // template code: |
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61 // |
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62 // markOop displaced_header = obj->mark().set_unlocked(); |
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63 // monitor->lock()->set_displaced_header(displaced_header); |
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64 // if (Atomic::cmpxchg_ptr(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) { |
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65 // // We stored the monitor address into the object's mark word. |
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66 // } else if (THREAD->is_lock_owned((address)displaced_header)) |
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67 // // Simple recursive case. |
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68 // monitor->lock()->set_displaced_header(NULL); |
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69 // } else { |
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70 // // Slow path. |
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71 // InterpreterRuntime::monitorenter(THREAD, monitor); |
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72 // } |
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73 |
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74 const Register displaced_header = R7_ARG5; |
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75 const Register object_mark_addr = R8_ARG6; |
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76 const Register current_header = R9_ARG7; |
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77 const Register tmp = R10_ARG8; |
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78 |
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79 Label done; |
14445 | 80 Label cas_failed, slow_case; |
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81 |
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82 assert_different_registers(displaced_header, object_mark_addr, current_header, tmp); |
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83 |
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84 |
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85 // markOop displaced_header = obj->mark().set_unlocked(); |
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86 |
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87 // Load markOop from object into displaced_header. |
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88 ld(displaced_header, oopDesc::mark_offset_in_bytes(), object); |
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89 |
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90 if (UseBiasedLocking) { |
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91 biased_locking_enter(CCR0, object, displaced_header, tmp, current_header, done, &slow_case); |
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92 } |
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93 |
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94 // Set displaced_header to be (markOop of object | UNLOCK_VALUE). |
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95 ori(displaced_header, displaced_header, markOopDesc::unlocked_value); |
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96 |
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97 |
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98 // monitor->lock()->set_displaced_header(displaced_header); |
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99 |
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100 // Initialize the box (Must happen before we update the object mark!). |
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101 std(displaced_header, BasicObjectLock::lock_offset_in_bytes() + |
14445 | 102 BasicLock::displaced_header_offset_in_bytes(), monitor); |
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103 |
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104 // if (Atomic::cmpxchg_ptr(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) { |
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105 |
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106 // Store stack address of the BasicObjectLock (this is monitor) into object. |
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107 addi(object_mark_addr, object, oopDesc::mark_offset_in_bytes()); |
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108 |
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109 // Must fence, otherwise, preceding store(s) may float below cmpxchg. |
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110 // CmpxchgX sets CCR0 to cmpX(current, displaced). |
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111 fence(); // TODO: replace by MacroAssembler::MemBarRel | MacroAssembler::MemBarAcq ? |
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112 cmpxchgd(/*flag=*/CCR0, |
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113 /*current_value=*/current_header, |
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114 /*compare_value=*/displaced_header, /*exchange_value=*/monitor, |
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115 /*where=*/object_mark_addr, |
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116 MacroAssembler::MemBarRel | MacroAssembler::MemBarAcq, |
14445 | 117 MacroAssembler::cmpxchgx_hint_acquire_lock(), |
118 noreg, | |
119 &cas_failed); | |
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120 |
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121 // If the compare-and-exchange succeeded, then we found an unlocked |
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122 // object and we have now locked it. |
14445 | 123 b(done); |
124 bind(cas_failed); | |
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125 |
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126 // } else if (THREAD->is_lock_owned((address)displaced_header)) |
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127 // // Simple recursive case. |
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128 // monitor->lock()->set_displaced_header(NULL); |
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129 |
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130 // We did not see an unlocked object so try the fast recursive case. |
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131 |
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132 // Check if owner is self by comparing the value in the markOop of object |
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133 // (current_header) with the stack pointer. |
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134 sub(current_header, current_header, R1_SP); |
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135 |
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136 assert(os::vm_page_size() > 0xfff, "page size too small - change the constant"); |
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137 load_const_optimized(tmp, |
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138 (address) (~(os::vm_page_size()-1) | |
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139 markOopDesc::lock_mask_in_place)); |
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140 |
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141 and_(R0/*==0?*/, current_header, tmp); |
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142 // If condition is true we are done and hence we can store 0 in the displaced |
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143 // header indicating it is a recursive lock. |
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144 bne(CCR0, slow_case); |
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145 release(); |
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146 std(R0/*==0!*/, BasicObjectLock::lock_offset_in_bytes() + |
14445 | 147 BasicLock::displaced_header_offset_in_bytes(), monitor); |
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148 b(done); |
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149 |
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150 |
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151 // } else { |
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152 // // Slow path. |
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153 // InterpreterRuntime::monitorenter(THREAD, monitor); |
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154 |
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155 // None of the above fast optimizations worked so we have to get into the |
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156 // slow case of monitor enter. |
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157 bind(slow_case); |
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158 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), |
14445 | 159 monitor, /*check_for_exceptions=*/true CC_INTERP_ONLY(&& false)); |
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160 // } |
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161 |
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162 bind(done); |
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163 } |
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164 } |
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165 |
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166 // Unlocks an object. Used in monitorexit bytecode and remove_activation. |
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167 // |
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168 // Registers alive |
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169 // monitor - Address of the BasicObjectLock to be used for locking, |
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170 // which must be initialized with the object to lock. |
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171 // |
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172 // Throw IllegalMonitorException if object is not locked by current thread. |
14445 | 173 void InterpreterMacroAssembler::unlock_object(Register monitor, bool check_for_exceptions) { |
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174 if (UseHeavyMonitors) { |
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175 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), |
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176 monitor, /*check_for_exceptions=*/false); |
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177 } else { |
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178 |
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179 // template code: |
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180 // |
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181 // if ((displaced_header = monitor->displaced_header()) == NULL) { |
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182 // // Recursive unlock. Mark the monitor unlocked by setting the object field to NULL. |
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183 // monitor->set_obj(NULL); |
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184 // } else if (Atomic::cmpxchg_ptr(displaced_header, obj->mark_addr(), monitor) == monitor) { |
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185 // // We swapped the unlocked mark in displaced_header into the object's mark word. |
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186 // monitor->set_obj(NULL); |
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187 // } else { |
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188 // // Slow path. |
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189 // InterpreterRuntime::monitorexit(THREAD, monitor); |
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190 // } |
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191 |
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192 const Register object = R7_ARG5; |
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193 const Register displaced_header = R8_ARG6; |
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194 const Register object_mark_addr = R9_ARG7; |
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195 const Register current_header = R10_ARG8; |
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196 |
14445 | 197 Label free_slot; |
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198 Label slow_case; |
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199 |
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200 assert_different_registers(object, displaced_header, object_mark_addr, current_header); |
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201 |
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202 if (UseBiasedLocking) { |
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203 // The object address from the monitor is in object. |
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204 ld(object, BasicObjectLock::obj_offset_in_bytes(), monitor); |
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205 assert(oopDesc::mark_offset_in_bytes() == 0, "offset of _mark is not 0"); |
14445 | 206 biased_locking_exit(CCR0, object, displaced_header, free_slot); |
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207 } |
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208 |
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209 // Test first if we are in the fast recursive case. |
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210 ld(displaced_header, BasicObjectLock::lock_offset_in_bytes() + |
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211 BasicLock::displaced_header_offset_in_bytes(), monitor); |
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212 |
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213 // If the displaced header is zero, we have a recursive unlock. |
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214 cmpdi(CCR0, displaced_header, 0); |
14445 | 215 beq(CCR0, free_slot); // recursive unlock |
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216 |
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217 // } else if (Atomic::cmpxchg_ptr(displaced_header, obj->mark_addr(), monitor) == monitor) { |
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218 // // We swapped the unlocked mark in displaced_header into the object's mark word. |
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219 // monitor->set_obj(NULL); |
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220 |
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221 // If we still have a lightweight lock, unlock the object and be done. |
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222 |
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223 // The object address from the monitor is in object. |
14445 | 224 if (!UseBiasedLocking) ld(object, BasicObjectLock::obj_offset_in_bytes(), monitor); |
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225 addi(object_mark_addr, object, oopDesc::mark_offset_in_bytes()); |
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226 |
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227 // We have the displaced header in displaced_header. If the lock is still |
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228 // lightweight, it will contain the monitor address and we'll store the |
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229 // displaced header back into the object's mark word. |
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230 // CmpxchgX sets CCR0 to cmpX(current, monitor). |
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231 cmpxchgd(/*flag=*/CCR0, |
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232 /*current_value=*/current_header, |
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233 /*compare_value=*/monitor, /*exchange_value=*/displaced_header, |
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234 /*where=*/object_mark_addr, |
14445 | 235 MacroAssembler::MemBarRel, |
236 MacroAssembler::cmpxchgx_hint_release_lock(), | |
237 noreg, | |
238 &slow_case); | |
239 b(free_slot); | |
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240 |
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241 // } else { |
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242 // // Slow path. |
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243 // InterpreterRuntime::monitorexit(THREAD, monitor); |
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244 |
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245 // The lock has been converted into a heavy lock and hence |
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246 // we need to get into the slow case. |
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247 bind(slow_case); |
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248 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), |
14445 | 249 monitor, check_for_exceptions CC_INTERP_ONLY(&& false)); |
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250 // } |
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251 |
14445 | 252 Label done; |
253 b(done); // Monitor register may be overwritten! Runtime has already freed the slot. | |
254 | |
255 // Exchange worked, do monitor->set_obj(NULL); | |
256 align(32, 12); | |
257 bind(free_slot); | |
258 li(R0, 0); | |
259 std(R0, BasicObjectLock::obj_offset_in_bytes(), monitor); | |
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260 bind(done); |
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261 } |
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262 } |
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263 |
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264 void InterpreterMacroAssembler::get_method_counters(Register method, |
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265 Register Rcounters, |
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266 Label& skip) { |
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267 BLOCK_COMMENT("Load and ev. allocate counter object {"); |
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268 Label has_counters; |
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269 ld(Rcounters, in_bytes(Method::method_counters_offset()), method); |
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270 cmpdi(CCR0, Rcounters, 0); |
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271 bne(CCR0, has_counters); |
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272 call_VM(noreg, CAST_FROM_FN_PTR(address, |
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273 InterpreterRuntime::build_method_counters), method, false); |
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274 ld(Rcounters, in_bytes(Method::method_counters_offset()), method); |
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275 cmpdi(CCR0, Rcounters, 0); |
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276 beq(CCR0, skip); // No MethodCounters, OutOfMemory. |
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277 BLOCK_COMMENT("} Load and ev. allocate counter object"); |
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278 |
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279 bind(has_counters); |
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280 } |
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281 |
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282 void InterpreterMacroAssembler::increment_invocation_counter(Register Rcounters, Register iv_be_count, Register Rtmp_r0) { |
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283 assert(UseCompiler, "incrementing must be useful"); |
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284 Register invocation_count = iv_be_count; |
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285 Register backedge_count = Rtmp_r0; |
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286 int delta = InvocationCounter::count_increment; |
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287 |
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288 // Load each counter in a register. |
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289 // ld(inv_counter, Rtmp); |
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290 // ld(be_counter, Rtmp2); |
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291 int inv_counter_offset = in_bytes(MethodCounters::invocation_counter_offset() + |
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292 InvocationCounter::counter_offset()); |
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293 int be_counter_offset = in_bytes(MethodCounters::backedge_counter_offset() + |
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294 InvocationCounter::counter_offset()); |
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295 |
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296 BLOCK_COMMENT("Increment profiling counters {"); |
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297 |
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298 // Load the backedge counter. |
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299 lwz(backedge_count, be_counter_offset, Rcounters); // is unsigned int |
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300 // Mask the backedge counter. |
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301 Register tmp = invocation_count; |
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302 li(tmp, InvocationCounter::count_mask_value); |
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303 andr(backedge_count, tmp, backedge_count); // Cannot use andi, need sign extension of count_mask_value. |
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304 |
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305 // Load the invocation counter. |
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306 lwz(invocation_count, inv_counter_offset, Rcounters); // is unsigned int |
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307 // Add the delta to the invocation counter and store the result. |
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308 addi(invocation_count, invocation_count, delta); |
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309 // Store value. |
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310 stw(invocation_count, inv_counter_offset, Rcounters); |
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311 |
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312 // Add invocation counter + backedge counter. |
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313 add(iv_be_count, backedge_count, invocation_count); |
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314 |
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315 // Note that this macro must leave the backedge_count + invocation_count in |
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316 // register iv_be_count! |
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317 BLOCK_COMMENT("} Increment profiling counters"); |
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318 } |
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319 |
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320 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) { |
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321 if (state == atos) { MacroAssembler::verify_oop(reg); } |
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322 } |
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323 |
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324 // Inline assembly for: |
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325 // |
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326 // if (thread is in interp_only_mode) { |
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327 // InterpreterRuntime::post_method_entry(); |
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328 // } |
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329 // if (*jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_ENTRY ) || |
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330 // *jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_ENTRY2) ) { |
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331 // SharedRuntime::jvmpi_method_entry(method, receiver); |
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332 // } |
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333 void InterpreterMacroAssembler::notify_method_entry() { |
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334 // JVMTI |
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335 // Whenever JVMTI puts a thread in interp_only_mode, method |
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336 // entry/exit events are sent for that thread to track stack |
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337 // depth. If it is possible to enter interp_only_mode we add |
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338 // the code to check if the event should be sent. |
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339 if (JvmtiExport::can_post_interpreter_events()) { |
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340 Label jvmti_post_done; |
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341 |
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342 lwz(R0, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread); |
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343 cmpwi(CCR0, R0, 0); |
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344 beq(CCR0, jvmti_post_done); |
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345 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_entry), |
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346 /*check_exceptions=*/false); |
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347 |
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348 bind(jvmti_post_done); |
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349 } |
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350 } |
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351 |
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352 |
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353 // Inline assembly for: |
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354 // |
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355 // if (thread is in interp_only_mode) { |
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356 // // save result |
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357 // InterpreterRuntime::post_method_exit(); |
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358 // // restore result |
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359 // } |
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360 // if (*jvmpi::event_flags_array_at_addr(JVMPI_EVENT_METHOD_EXIT)) { |
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361 // // save result |
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362 // SharedRuntime::jvmpi_method_exit(); |
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363 // // restore result |
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364 // } |
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365 // |
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366 // Native methods have their result stored in d_tmp and l_tmp. |
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367 // Java methods have their result stored in the expression stack. |
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368 void InterpreterMacroAssembler::notify_method_exit(bool is_native_method, TosState state) { |
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369 // JVMTI |
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370 // Whenever JVMTI puts a thread in interp_only_mode, method |
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371 // entry/exit events are sent for that thread to track stack |
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372 // depth. If it is possible to enter interp_only_mode we add |
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373 // the code to check if the event should be sent. |
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374 if (JvmtiExport::can_post_interpreter_events()) { |
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375 Label jvmti_post_done; |
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|
376 |
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377 lwz(R0, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread); |
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378 cmpwi(CCR0, R0, 0); |
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379 beq(CCR0, jvmti_post_done); |
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380 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit), |
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381 /*check_exceptions=*/false); |
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382 |
14445 | 383 align(32, 12); |
14408
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384 bind(jvmti_post_done); |
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385 } |
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|
386 } |
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|
387 |
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388 // Convert the current TOP_IJAVA_FRAME into a PARENT_IJAVA_FRAME |
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389 // (using parent_frame_resize) and push a new interpreter |
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390 // TOP_IJAVA_FRAME (using frame_size). |
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391 void InterpreterMacroAssembler::push_interpreter_frame(Register top_frame_size, Register parent_frame_resize, |
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392 Register tmp1, Register tmp2, Register tmp3, |
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393 Register tmp4, Register pc) { |
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394 assert_different_registers(top_frame_size, parent_frame_resize, tmp1, tmp2, tmp3, tmp4); |
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395 ld(tmp1, _top_ijava_frame_abi(frame_manager_lr), R1_SP); |
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396 mr(tmp2/*top_frame_sp*/, R1_SP); |
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397 // Move initial_caller_sp. |
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398 ld(tmp4, _top_ijava_frame_abi(initial_caller_sp), R1_SP); |
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399 neg(parent_frame_resize, parent_frame_resize); |
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400 resize_frame(parent_frame_resize/*-parent_frame_resize*/, tmp3); |
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|
401 |
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|
402 // Set LR in new parent frame. |
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403 std(tmp1, _abi(lr), R1_SP); |
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|
404 // Set top_frame_sp info for new parent frame. |
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|
405 std(tmp2, _parent_ijava_frame_abi(top_frame_sp), R1_SP); |
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406 std(tmp4, _parent_ijava_frame_abi(initial_caller_sp), R1_SP); |
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|
407 |
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408 // Push new TOP_IJAVA_FRAME. |
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409 push_frame(top_frame_size, tmp2); |
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|
410 |
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|
411 get_PC_trash_LR(tmp3); |
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|
412 std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP); |
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413 // Used for non-initial callers by unextended_sp(). |
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414 std(R1_SP, _top_ijava_frame_abi(initial_caller_sp), R1_SP); |
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|
415 } |
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|
416 |
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417 // Pop the topmost TOP_IJAVA_FRAME and convert the previous |
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418 // PARENT_IJAVA_FRAME back into a TOP_IJAVA_FRAME. |
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419 void InterpreterMacroAssembler::pop_interpreter_frame(Register tmp1, Register tmp2, Register tmp3, Register tmp4) { |
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420 assert_different_registers(tmp1, tmp2, tmp3, tmp4); |
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|
421 |
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422 ld(tmp1/*caller's sp*/, _abi(callers_sp), R1_SP); |
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423 ld(tmp3, _abi(lr), tmp1); |
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424 |
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425 ld(tmp4, _parent_ijava_frame_abi(initial_caller_sp), tmp1); |
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426 |
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427 ld(tmp2/*caller's caller's sp*/, _abi(callers_sp), tmp1); |
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428 // Merge top frame. |
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429 std(tmp2, _abi(callers_sp), R1_SP); |
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430 |
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431 ld(tmp2, _parent_ijava_frame_abi(top_frame_sp), tmp1); |
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432 |
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433 // Update C stack pointer to caller's top_abi. |
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434 resize_frame_absolute(tmp2/*addr*/, tmp1/*tmp*/, tmp2/*tmp*/); |
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435 |
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436 // Update LR in top_frame. |
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437 std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP); |
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438 |
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439 std(tmp4, _top_ijava_frame_abi(initial_caller_sp), R1_SP); |
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440 |
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441 // Store the top-frame stack-pointer for c2i adapters. |
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442 std(R1_SP, _top_ijava_frame_abi(top_frame_sp), R1_SP); |
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443 } |
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444 |
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445 #ifdef CC_INTERP |
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446 // Turn state's interpreter frame into the current TOP_IJAVA_FRAME. |
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447 void InterpreterMacroAssembler::pop_interpreter_frame_to_state(Register state, Register tmp1, Register tmp2, Register tmp3) { |
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448 assert_different_registers(R14_state, R15_prev_state, tmp1, tmp2, tmp3); |
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449 |
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450 if (state == R14_state) { |
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451 ld(tmp1/*state's fp*/, state_(_last_Java_fp)); |
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452 ld(tmp2/*state's sp*/, state_(_last_Java_sp)); |
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453 } else if (state == R15_prev_state) { |
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454 ld(tmp1/*state's fp*/, prev_state_(_last_Java_fp)); |
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455 ld(tmp2/*state's sp*/, prev_state_(_last_Java_sp)); |
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456 } else { |
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457 ShouldNotReachHere(); |
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458 } |
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|
459 |
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460 // Merge top frames. |
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461 std(tmp1, _abi(callers_sp), R1_SP); |
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|
462 |
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463 // Tmp2 is new SP. |
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464 // Tmp1 is parent's SP. |
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465 resize_frame_absolute(tmp2/*addr*/, tmp1/*tmp*/, tmp2/*tmp*/); |
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466 |
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467 // Update LR in top_frame. |
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468 // Must be interpreter frame. |
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469 get_PC_trash_LR(tmp3); |
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470 std(tmp3, _top_ijava_frame_abi(frame_manager_lr), R1_SP); |
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471 // Used for non-initial callers by unextended_sp(). |
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472 std(R1_SP, _top_ijava_frame_abi(initial_caller_sp), R1_SP); |
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473 } |
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474 #endif // CC_INTERP |
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|
475 |
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476 // Set SP to initial caller's sp, but before fix the back chain. |
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477 void InterpreterMacroAssembler::resize_frame_to_initial_caller(Register tmp1, Register tmp2) { |
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478 ld(tmp1, _parent_ijava_frame_abi(initial_caller_sp), R1_SP); |
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479 ld(tmp2, _parent_ijava_frame_abi(callers_sp), R1_SP); |
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480 std(tmp2, _parent_ijava_frame_abi(callers_sp), tmp1); // Fix back chain ... |
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481 mr(R1_SP, tmp1); // ... and resize to initial caller. |
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482 } |
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|
483 |
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|
484 #ifdef CC_INTERP |
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parents:
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|
485 // Pop the current interpreter state (without popping the correspoding |
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|
486 // frame) and restore R14_state and R15_prev_state accordingly. |
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487 // Use prev_state_may_be_0 to indicate whether prev_state may be 0 |
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488 // in order to generate an extra check before retrieving prev_state_(_prev_link). |
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489 void InterpreterMacroAssembler::pop_interpreter_state(bool prev_state_may_be_0) |
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490 { |
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|
491 // Move prev_state to state and restore prev_state from state_(_prev_link). |
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parents:
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|
492 Label prev_state_is_0; |
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|
493 mr(R14_state, R15_prev_state); |
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|
494 |
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|
495 // Don't retrieve /*state==*/prev_state_(_prev_link) |
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|
496 // if /*state==*/prev_state is 0. |
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parents:
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|
497 if (prev_state_may_be_0) { |
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|
498 cmpdi(CCR0, R15_prev_state, 0); |
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|
499 beq(CCR0, prev_state_is_0); |
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parents:
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|
500 } |
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parents:
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|
501 |
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parents:
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|
502 ld(R15_prev_state, /*state==*/prev_state_(_prev_link)); |
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parents:
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|
503 bind(prev_state_is_0); |
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parents:
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|
504 } |
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parents:
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|
505 |
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parents:
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|
506 void InterpreterMacroAssembler::restore_prev_state() { |
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parents:
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|
507 // _prev_link is private, but cInterpreter is a friend. |
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parents:
diff
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|
508 ld(R15_prev_state, state_(_prev_link)); |
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parents:
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|
509 } |
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parents:
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|
510 #endif // CC_INTERP |