Mercurial > hg > graal-compiler
annotate src/cpu/ppc/vm/interpreter_ppc.cpp @ 14443:3205e78d8193
8029396: PPC64 (part 212): Several memory ordering fixes in C-code.
Summary: memory ordering fixes in GC and other runtime code showing on PPC64.
Reviewed-by: kvn, coleenp
author | goetz |
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date | Mon, 02 Dec 2013 10:26:14 +0100 |
parents | ec28f9c041ff |
children | 67fa91961822 |
rev | line source |
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14408
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1 /* |
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2 * Copyright (c) 1997, 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 #include "precompiled.hpp" |
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27 #include "asm/assembler.hpp" |
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28 #include "asm/macroAssembler.inline.hpp" |
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29 #include "interpreter/bytecodeHistogram.hpp" |
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30 #include "interpreter/interpreter.hpp" |
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31 #include "interpreter/interpreterGenerator.hpp" |
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32 #include "interpreter/interpreterRuntime.hpp" |
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33 #include "interpreter/templateTable.hpp" |
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34 #include "oops/arrayOop.hpp" |
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35 #include "oops/methodData.hpp" |
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36 #include "oops/method.hpp" |
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37 #include "oops/oop.inline.hpp" |
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38 #include "prims/jvmtiExport.hpp" |
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39 #include "prims/jvmtiThreadState.hpp" |
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40 #include "prims/methodHandles.hpp" |
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41 #include "runtime/arguments.hpp" |
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42 #include "runtime/deoptimization.hpp" |
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43 #include "runtime/frame.inline.hpp" |
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44 #include "runtime/sharedRuntime.hpp" |
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45 #include "runtime/stubRoutines.hpp" |
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46 #include "runtime/synchronizer.hpp" |
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47 #include "runtime/timer.hpp" |
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48 #include "runtime/vframeArray.hpp" |
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49 #include "utilities/debug.hpp" |
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50 #ifdef COMPILER1 |
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51 #include "c1/c1_Runtime1.hpp" |
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52 #endif |
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53 |
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54 #ifndef CC_INTERP |
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55 #error "CC_INTERP must be defined on PPC" |
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56 #endif |
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57 |
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58 #define __ _masm-> |
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59 |
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60 #ifdef PRODUCT |
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61 #define BLOCK_COMMENT(str) // nothing |
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62 #else |
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63 #define BLOCK_COMMENT(str) __ block_comment(str) |
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64 #endif |
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65 |
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66 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") |
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67 |
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68 int AbstractInterpreter::BasicType_as_index(BasicType type) { |
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69 int i = 0; |
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70 switch (type) { |
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71 case T_BOOLEAN: i = 0; break; |
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72 case T_CHAR : i = 1; break; |
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73 case T_BYTE : i = 2; break; |
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74 case T_SHORT : i = 3; break; |
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75 case T_INT : i = 4; break; |
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76 case T_LONG : i = 5; break; |
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77 case T_VOID : i = 6; break; |
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78 case T_FLOAT : i = 7; break; |
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79 case T_DOUBLE : i = 8; break; |
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80 case T_OBJECT : i = 9; break; |
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81 case T_ARRAY : i = 9; break; |
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82 default : ShouldNotReachHere(); |
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83 } |
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84 assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds"); |
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85 return i; |
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86 } |
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87 |
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88 address AbstractInterpreterGenerator::generate_slow_signature_handler() { |
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89 // Slow_signature handler that respects the PPC C calling conventions. |
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90 // |
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91 // We get called by the native entry code with our output register |
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92 // area == 8. First we call InterpreterRuntime::get_result_handler |
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93 // to copy the pointer to the signature string temporarily to the |
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94 // first C-argument and to return the result_handler in |
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95 // R3_RET. Since native_entry will copy the jni-pointer to the |
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96 // first C-argument slot later on, it is OK to occupy this slot |
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97 // temporarilly. Then we copy the argument list on the java |
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98 // expression stack into native varargs format on the native stack |
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99 // and load arguments into argument registers. Integer arguments in |
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100 // the varargs vector will be sign-extended to 8 bytes. |
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101 // |
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102 // On entry: |
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103 // R3_ARG1 - intptr_t* Address of java argument list in memory. |
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104 // R15_prev_state - BytecodeInterpreter* Address of interpreter state for |
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105 // this method |
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106 // R19_method |
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107 // |
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108 // On exit (just before return instruction): |
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109 // R3_RET - contains the address of the result_handler. |
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110 // R4_ARG2 - is not updated for static methods and contains "this" otherwise. |
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111 // R5_ARG3-R10_ARG8: - When the (i-2)th Java argument is not of type float or double, |
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112 // ARGi contains this argument. Otherwise, ARGi is not updated. |
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113 // F1_ARG1-F13_ARG13 - contain the first 13 arguments of type float or double. |
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114 |
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115 const int LogSizeOfTwoInstructions = 3; |
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116 |
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117 // FIXME: use Argument:: GL: Argument names different numbers! |
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118 const int max_fp_register_arguments = 13; |
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119 const int max_int_register_arguments = 6; // first 2 are reserved |
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120 |
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121 const Register arg_java = R21_tmp1; |
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122 const Register arg_c = R22_tmp2; |
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123 const Register signature = R23_tmp3; // is string |
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124 const Register sig_byte = R24_tmp4; |
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125 const Register fpcnt = R25_tmp5; |
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126 const Register argcnt = R26_tmp6; |
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127 const Register intSlot = R27_tmp7; |
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128 const Register target_sp = R28_tmp8; |
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129 const FloatRegister floatSlot = F0; |
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130 |
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131 address entry = __ emit_fd(); |
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132 |
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133 __ save_LR_CR(R0); |
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134 __ save_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14)); |
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135 // We use target_sp for storing arguments in the C frame. |
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136 __ mr(target_sp, R1_SP); |
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137 __ push_frame_abi112_nonvolatiles(0, R11_scratch1); |
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138 |
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139 __ mr(arg_java, R3_ARG1); |
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140 |
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141 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_signature), R16_thread, R19_method); |
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142 |
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143 // Signature is in R3_RET. Signature is callee saved. |
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144 __ mr(signature, R3_RET); |
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145 |
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146 // Reload method, it may have moved. |
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147 #ifdef CC_INTERP |
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148 __ ld(R19_method, state_(_method)); |
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149 #else |
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150 __ unimplemented("slow signature handler 1"); |
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151 #endif |
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152 |
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153 // Get the result handler. |
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154 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_result_handler), R16_thread, R19_method); |
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155 |
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156 // Reload method, it may have moved. |
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157 #ifdef CC_INTERP |
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158 __ ld(R19_method, state_(_method)); |
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159 #else |
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160 __ unimplemented("slow signature handler 2"); |
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161 #endif |
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162 |
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163 { |
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164 Label L; |
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165 // test if static |
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166 // _access_flags._flags must be at offset 0. |
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167 // TODO PPC port: requires change in shared code. |
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168 //assert(in_bytes(AccessFlags::flags_offset()) == 0, |
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169 // "MethodOopDesc._access_flags == MethodOopDesc._access_flags._flags"); |
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170 // _access_flags must be a 32 bit value. |
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171 assert(sizeof(AccessFlags) == 4, "wrong size"); |
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172 __ lwa(R11_scratch1/*access_flags*/, method_(access_flags)); |
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173 // testbit with condition register. |
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174 __ testbitdi(CCR0, R0, R11_scratch1/*access_flags*/, JVM_ACC_STATIC_BIT); |
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175 __ btrue(CCR0, L); |
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176 // For non-static functions, pass "this" in R4_ARG2 and copy it |
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177 // to 2nd C-arg slot. |
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178 // We need to box the Java object here, so we use arg_java |
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179 // (address of current Java stack slot) as argument and don't |
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180 // dereference it as in case of ints, floats, etc. |
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181 __ mr(R4_ARG2, arg_java); |
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182 __ addi(arg_java, arg_java, -BytesPerWord); |
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183 __ std(R4_ARG2, _abi(carg_2), target_sp); |
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184 __ bind(L); |
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185 } |
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186 |
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187 // Will be incremented directly after loop_start. argcnt=0 |
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188 // corresponds to 3rd C argument. |
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189 __ li(argcnt, -1); |
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190 // arg_c points to 3rd C argument |
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191 __ addi(arg_c, target_sp, _abi(carg_3)); |
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192 // no floating-point args parsed so far |
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193 __ li(fpcnt, 0); |
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194 |
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195 Label move_intSlot_to_ARG, move_floatSlot_to_FARG; |
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196 Label loop_start, loop_end; |
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197 Label do_int, do_long, do_float, do_double, do_dontreachhere, do_object, do_array, do_boxed; |
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198 |
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199 // signature points to '(' at entry |
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200 #ifdef ASSERT |
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201 __ lbz(sig_byte, 0, signature); |
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202 __ cmplwi(CCR0, sig_byte, '('); |
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203 __ bne(CCR0, do_dontreachhere); |
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204 #endif |
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205 |
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206 __ bind(loop_start); |
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207 |
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208 __ addi(argcnt, argcnt, 1); |
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209 __ lbzu(sig_byte, 1, signature); |
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210 |
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211 __ cmplwi(CCR0, sig_byte, ')'); // end of signature |
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212 __ beq(CCR0, loop_end); |
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213 |
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214 __ cmplwi(CCR0, sig_byte, 'B'); // byte |
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215 __ beq(CCR0, do_int); |
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216 |
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217 __ cmplwi(CCR0, sig_byte, 'C'); // char |
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218 __ beq(CCR0, do_int); |
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219 |
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220 __ cmplwi(CCR0, sig_byte, 'D'); // double |
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221 __ beq(CCR0, do_double); |
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222 |
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223 __ cmplwi(CCR0, sig_byte, 'F'); // float |
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224 __ beq(CCR0, do_float); |
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225 |
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226 __ cmplwi(CCR0, sig_byte, 'I'); // int |
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227 __ beq(CCR0, do_int); |
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228 |
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229 __ cmplwi(CCR0, sig_byte, 'J'); // long |
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230 __ beq(CCR0, do_long); |
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231 |
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232 __ cmplwi(CCR0, sig_byte, 'S'); // short |
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233 __ beq(CCR0, do_int); |
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234 |
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235 __ cmplwi(CCR0, sig_byte, 'Z'); // boolean |
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236 __ beq(CCR0, do_int); |
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237 |
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238 __ cmplwi(CCR0, sig_byte, 'L'); // object |
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239 __ beq(CCR0, do_object); |
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240 |
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241 __ cmplwi(CCR0, sig_byte, '['); // array |
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242 __ beq(CCR0, do_array); |
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243 |
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244 // __ cmplwi(CCR0, sig_byte, 'V'); // void cannot appear since we do not parse the return type |
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245 // __ beq(CCR0, do_void); |
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246 |
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247 __ bind(do_dontreachhere); |
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248 |
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249 __ unimplemented("ShouldNotReachHere in slow_signature_handler", 120); |
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250 |
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251 __ bind(do_array); |
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252 |
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253 { |
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254 Label start_skip, end_skip; |
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255 |
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256 __ bind(start_skip); |
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257 __ lbzu(sig_byte, 1, signature); |
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258 __ cmplwi(CCR0, sig_byte, '['); |
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259 __ beq(CCR0, start_skip); // skip further brackets |
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260 __ cmplwi(CCR0, sig_byte, '9'); |
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261 __ bgt(CCR0, end_skip); // no optional size |
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262 __ cmplwi(CCR0, sig_byte, '0'); |
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263 __ bge(CCR0, start_skip); // skip optional size |
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264 __ bind(end_skip); |
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265 |
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266 __ cmplwi(CCR0, sig_byte, 'L'); |
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267 __ beq(CCR0, do_object); // for arrays of objects, the name of the object must be skipped |
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268 __ b(do_boxed); // otherwise, go directly to do_boxed |
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269 } |
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270 |
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271 __ bind(do_object); |
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272 { |
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273 Label L; |
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274 __ bind(L); |
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275 __ lbzu(sig_byte, 1, signature); |
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276 __ cmplwi(CCR0, sig_byte, ';'); |
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277 __ bne(CCR0, L); |
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278 } |
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279 // Need to box the Java object here, so we use arg_java (address of |
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280 // current Java stack slot) as argument and don't dereference it as |
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281 // in case of ints, floats, etc. |
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282 Label do_null; |
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283 __ bind(do_boxed); |
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parents:
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|
284 __ ld(R0,0, arg_java); |
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|
285 __ cmpdi(CCR0, R0, 0); |
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286 __ li(intSlot,0); |
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|
287 __ beq(CCR0, do_null); |
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288 __ mr(intSlot, arg_java); |
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289 __ bind(do_null); |
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290 __ std(intSlot, 0, arg_c); |
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291 __ addi(arg_java, arg_java, -BytesPerWord); |
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292 __ addi(arg_c, arg_c, BytesPerWord); |
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293 __ cmplwi(CCR0, argcnt, max_int_register_arguments); |
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294 __ blt(CCR0, move_intSlot_to_ARG); |
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295 __ b(loop_start); |
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|
296 |
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297 __ bind(do_int); |
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298 __ lwa(intSlot, 0, arg_java); |
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299 __ std(intSlot, 0, arg_c); |
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300 __ addi(arg_java, arg_java, -BytesPerWord); |
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301 __ addi(arg_c, arg_c, BytesPerWord); |
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302 __ cmplwi(CCR0, argcnt, max_int_register_arguments); |
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303 __ blt(CCR0, move_intSlot_to_ARG); |
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304 __ b(loop_start); |
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|
305 |
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306 __ bind(do_long); |
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307 __ ld(intSlot, -BytesPerWord, arg_java); |
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308 __ std(intSlot, 0, arg_c); |
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309 __ addi(arg_java, arg_java, - 2 * BytesPerWord); |
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310 __ addi(arg_c, arg_c, BytesPerWord); |
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311 __ cmplwi(CCR0, argcnt, max_int_register_arguments); |
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312 __ blt(CCR0, move_intSlot_to_ARG); |
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313 __ b(loop_start); |
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314 |
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315 __ bind(do_float); |
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316 __ lfs(floatSlot, 0, arg_java); |
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317 #if defined(LINUX) |
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318 __ stfs(floatSlot, 4, arg_c); |
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319 #elif defined(AIX) |
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320 __ stfs(floatSlot, 0, arg_c); |
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|
321 #else |
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322 #error "unknown OS" |
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323 #endif |
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324 __ addi(arg_java, arg_java, -BytesPerWord); |
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325 __ addi(arg_c, arg_c, BytesPerWord); |
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326 __ cmplwi(CCR0, fpcnt, max_fp_register_arguments); |
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327 __ blt(CCR0, move_floatSlot_to_FARG); |
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328 __ b(loop_start); |
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|
329 |
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330 __ bind(do_double); |
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331 __ lfd(floatSlot, - BytesPerWord, arg_java); |
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332 __ stfd(floatSlot, 0, arg_c); |
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333 __ addi(arg_java, arg_java, - 2 * BytesPerWord); |
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334 __ addi(arg_c, arg_c, BytesPerWord); |
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335 __ cmplwi(CCR0, fpcnt, max_fp_register_arguments); |
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336 __ blt(CCR0, move_floatSlot_to_FARG); |
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337 __ b(loop_start); |
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|
338 |
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|
339 __ bind(loop_end); |
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|
340 |
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341 __ pop_frame(); |
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342 __ restore_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14)); |
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343 __ restore_LR_CR(R0); |
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|
344 |
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345 __ blr(); |
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|
346 |
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347 Label move_int_arg, move_float_arg; |
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348 __ bind(move_int_arg); // each case must consist of 2 instructions (otherwise adapt LogSizeOfTwoInstructions) |
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349 __ mr(R5_ARG3, intSlot); __ b(loop_start); |
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350 __ mr(R6_ARG4, intSlot); __ b(loop_start); |
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351 __ mr(R7_ARG5, intSlot); __ b(loop_start); |
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352 __ mr(R8_ARG6, intSlot); __ b(loop_start); |
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353 __ mr(R9_ARG7, intSlot); __ b(loop_start); |
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354 __ mr(R10_ARG8, intSlot); __ b(loop_start); |
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|
355 |
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356 __ bind(move_float_arg); // each case must consist of 2 instructions (otherwise adapt LogSizeOfTwoInstructions) |
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357 __ fmr(F1_ARG1, floatSlot); __ b(loop_start); |
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358 __ fmr(F2_ARG2, floatSlot); __ b(loop_start); |
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359 __ fmr(F3_ARG3, floatSlot); __ b(loop_start); |
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360 __ fmr(F4_ARG4, floatSlot); __ b(loop_start); |
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361 __ fmr(F5_ARG5, floatSlot); __ b(loop_start); |
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|
362 __ fmr(F6_ARG6, floatSlot); __ b(loop_start); |
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363 __ fmr(F7_ARG7, floatSlot); __ b(loop_start); |
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|
364 __ fmr(F8_ARG8, floatSlot); __ b(loop_start); |
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|
365 __ fmr(F9_ARG9, floatSlot); __ b(loop_start); |
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366 __ fmr(F10_ARG10, floatSlot); __ b(loop_start); |
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367 __ fmr(F11_ARG11, floatSlot); __ b(loop_start); |
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368 __ fmr(F12_ARG12, floatSlot); __ b(loop_start); |
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369 __ fmr(F13_ARG13, floatSlot); __ b(loop_start); |
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|
370 |
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371 __ bind(move_intSlot_to_ARG); |
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372 __ sldi(R0, argcnt, LogSizeOfTwoInstructions); |
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373 __ load_const(R11_scratch1, move_int_arg); // Label must be bound here. |
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374 __ add(R11_scratch1, R0, R11_scratch1); |
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375 __ mtctr(R11_scratch1/*branch_target*/); |
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376 __ bctr(); |
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377 __ bind(move_floatSlot_to_FARG); |
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378 __ sldi(R0, fpcnt, LogSizeOfTwoInstructions); |
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379 __ addi(fpcnt, fpcnt, 1); |
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380 __ load_const(R11_scratch1, move_float_arg); // Label must be bound here. |
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381 __ add(R11_scratch1, R0, R11_scratch1); |
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382 __ mtctr(R11_scratch1/*branch_target*/); |
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383 __ bctr(); |
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|
384 |
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|
385 return entry; |
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|
386 } |
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|
387 |
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|
388 address AbstractInterpreterGenerator::generate_result_handler_for(BasicType type) { |
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|
389 // |
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|
390 // Registers alive |
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|
391 // R3_RET |
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|
392 // LR |
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|
393 // |
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|
394 // Registers updated |
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|
395 // R3_RET |
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|
396 // |
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parents:
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|
397 |
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parents:
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|
398 Label done; |
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parents:
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|
399 Label is_false; |
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parents:
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|
400 |
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parents:
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|
401 address entry = __ pc(); |
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parents:
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|
402 |
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parents:
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|
403 switch (type) { |
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parents:
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|
404 case T_BOOLEAN: |
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parents:
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|
405 __ cmpwi(CCR0, R3_RET, 0); |
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parents:
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|
406 __ beq(CCR0, is_false); |
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parents:
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|
407 __ li(R3_RET, 1); |
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parents:
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|
408 __ b(done); |
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parents:
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|
409 __ bind(is_false); |
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parents:
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|
410 __ li(R3_RET, 0); |
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parents:
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|
411 break; |
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parents:
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|
412 case T_BYTE: |
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parents:
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|
413 // sign extend 8 bits |
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parents:
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|
414 __ extsb(R3_RET, R3_RET); |
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|
415 break; |
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parents:
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|
416 case T_CHAR: |
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|
417 // zero extend 16 bits |
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|
418 __ clrldi(R3_RET, R3_RET, 48); |
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|
419 break; |
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parents:
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|
420 case T_SHORT: |
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parents:
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|
421 // sign extend 16 bits |
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|
422 __ extsh(R3_RET, R3_RET); |
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|
423 break; |
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|
424 case T_INT: |
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|
425 // sign extend 32 bits |
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|
426 __ extsw(R3_RET, R3_RET); |
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|
427 break; |
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|
428 case T_LONG: |
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parents:
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|
429 break; |
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parents:
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|
430 case T_OBJECT: |
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parents:
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|
431 // unbox result if not null |
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|
432 __ cmpdi(CCR0, R3_RET, 0); |
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433 __ beq(CCR0, done); |
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parents:
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|
434 __ ld(R3_RET, 0, R3_RET); |
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parents:
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|
435 __ verify_oop(R3_RET); |
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parents:
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|
436 break; |
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parents:
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|
437 case T_FLOAT: |
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parents:
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|
438 break; |
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parents:
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|
439 case T_DOUBLE: |
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parents:
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|
440 break; |
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parents:
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|
441 case T_VOID: |
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parents:
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|
442 break; |
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parents:
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|
443 default: ShouldNotReachHere(); |
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parents:
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|
444 } |
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parents:
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|
445 |
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parents:
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|
446 __ BIND(done); |
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parents:
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|
447 __ blr(); |
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parents:
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|
448 |
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parents:
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|
449 return entry; |
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parents:
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|
450 } |
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parents:
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|
451 |
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parents:
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|
452 // Abstract method entry. |
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parents:
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|
453 // |
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parents:
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|
454 address InterpreterGenerator::generate_abstract_entry(void) { |
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|
455 address entry = __ pc(); |
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parents:
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|
456 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
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|
457 // |
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parents:
diff
changeset
|
458 // Registers alive |
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parents:
diff
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|
459 // R16_thread - JavaThread* |
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parents:
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|
460 // R19_method - callee's methodOop (method to be invoked) |
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|
461 // R1_SP - SP prepared such that caller's outgoing args are near top |
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|
462 // LR - return address to caller |
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parents:
diff
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|
463 // |
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parents:
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|
464 // Stack layout at this point: |
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parents:
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|
465 // |
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parents:
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|
466 // 0 [TOP_IJAVA_FRAME_ABI] <-- R1_SP |
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|
467 // alignment (optional) |
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parents:
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|
468 // [outgoing Java arguments] |
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parents:
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|
469 // ... |
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parents:
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|
470 // PARENT [PARENT_IJAVA_FRAME_ABI] |
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parents:
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|
471 // ... |
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parents:
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|
472 // |
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parents:
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|
473 |
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parents:
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|
474 // Can't use call_VM here because we have not set up a new |
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|
475 // interpreter state. Make the call to the vm and make it look like |
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parents:
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|
476 // our caller set up the JavaFrameAnchor. |
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parents:
diff
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|
477 __ set_top_ijava_frame_at_SP_as_last_Java_frame(R1_SP, R12_scratch2/*tmp*/); |
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parents:
diff
changeset
|
478 |
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parents:
diff
changeset
|
479 // Push a new C frame and save LR. |
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parents:
diff
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|
480 __ save_LR_CR(R0); |
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parents:
diff
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|
481 __ push_frame_abi112_nonvolatiles(0, R11_scratch1); |
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parents:
diff
changeset
|
482 |
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parents:
diff
changeset
|
483 // This is not a leaf but we have a JavaFrameAnchor now and we will |
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parents:
diff
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|
484 // check (create) exceptions afterward so this is ok. |
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parents:
diff
changeset
|
485 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError)); |
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parents:
diff
changeset
|
486 |
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parents:
diff
changeset
|
487 // Pop the C frame and restore LR. |
ec28f9c041ff
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parents:
diff
changeset
|
488 __ pop_frame(); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
489 __ restore_LR_CR(R0); |
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parents:
diff
changeset
|
490 |
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parents:
diff
changeset
|
491 // Reset JavaFrameAnchor from call_VM_leaf above. |
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parents:
diff
changeset
|
492 __ reset_last_Java_frame(); |
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parents:
diff
changeset
|
493 |
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parents:
diff
changeset
|
494 // Return to frame manager, it will handle the pending exception. |
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parents:
diff
changeset
|
495 __ blr(); |
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parents:
diff
changeset
|
496 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
497 return entry; |
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parents:
diff
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|
498 } |
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parents:
diff
changeset
|
499 |
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parents:
diff
changeset
|
500 // Call an accessor method (assuming it is resolved, otherwise drop into |
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parents:
diff
changeset
|
501 // vanilla (slow path) entry. |
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parents:
diff
changeset
|
502 address InterpreterGenerator::generate_accessor_entry(void) { |
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parents:
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|
503 if(!UseFastAccessorMethods && (!FLAG_IS_ERGO(UseFastAccessorMethods))) |
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parents:
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|
504 return NULL; |
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parents:
diff
changeset
|
505 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
506 Label Ldone, Lslow_path; |
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parents:
diff
changeset
|
507 |
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parents:
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|
508 const Register Rthis = R3_ARG1, |
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parents:
diff
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|
509 Rconst_method = R4_ARG2, |
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parents:
diff
changeset
|
510 Rcodes = Rconst_method, |
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parents:
diff
changeset
|
511 Rcpool_cache = R5_ARG3, |
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parents:
diff
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|
512 Rscratch = R11_scratch1, |
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parents:
diff
changeset
|
513 Rjvmti_mode = Rscratch, |
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parents:
diff
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|
514 Roffset = R12_scratch2, |
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parents:
diff
changeset
|
515 Rflags = R6_ARG4; |
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parents:
diff
changeset
|
516 |
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parents:
diff
changeset
|
517 address entry = __ pc(); |
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parents:
diff
changeset
|
518 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
519 // Check for safepoint: |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
520 // Ditch this, real man don't need safepoint checks. |
ec28f9c041ff
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parents:
diff
changeset
|
521 |
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parents:
diff
changeset
|
522 // Also check for JVMTI mode |
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parents:
diff
changeset
|
523 // Check for null obj, take slow path if so. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
524 #ifdef CC_INTERP |
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parents:
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|
525 __ ld(Rthis, Interpreter::stackElementSize, R17_tos); |
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parents:
diff
changeset
|
526 #else |
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parents:
diff
changeset
|
527 Unimplemented() |
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parents:
diff
changeset
|
528 #endif |
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parents:
diff
changeset
|
529 __ lwz(Rjvmti_mode, thread_(interp_only_mode)); |
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parents:
diff
changeset
|
530 __ cmpdi(CCR1, Rthis, 0); |
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parents:
diff
changeset
|
531 __ cmpwi(CCR0, Rjvmti_mode, 0); |
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parents:
diff
changeset
|
532 __ crorc(/*CCR0 eq*/2, /*CCR1 eq*/4+2, /*CCR0 eq*/2); |
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parents:
diff
changeset
|
533 __ beq(CCR0, Lslow_path); // this==null or jvmti_mode!=0 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
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|
534 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
535 // Do 2 things in parallel: |
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parents:
diff
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|
536 // 1. Load the index out of the first instruction word, which looks like this: |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
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|
537 // <0x2a><0xb4><index (2 byte, native endianess)>. |
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parents:
diff
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|
538 // 2. Load constant pool cache base. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
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|
539 __ ld(Rconst_method, in_bytes(Method::const_offset()), R19_method); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
540 __ ld(Rcpool_cache, in_bytes(ConstMethod::constants_offset()), Rconst_method); |
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parents:
diff
changeset
|
541 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
542 __ lhz(Rcodes, in_bytes(ConstMethod::codes_offset()) + 2, Rconst_method); // Lower half of 32 bit field. |
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parents:
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|
543 __ ld(Rcpool_cache, ConstantPool::cache_offset_in_bytes(), Rcpool_cache); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
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|
544 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
545 // Get the const pool entry by means of <index>. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
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|
546 const int codes_shift = exact_log2(in_words(ConstantPoolCacheEntry::size()) * BytesPerWord); |
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parents:
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|
547 __ slwi(Rscratch, Rcodes, codes_shift); // (codes&0xFFFF)<<codes_shift |
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parents:
diff
changeset
|
548 __ add(Rcpool_cache, Rscratch, Rcpool_cache); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
549 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
550 // Check if cpool cache entry is resolved. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
551 // We are resolved if the indices offset contains the current bytecode. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
552 ByteSize cp_base_offset = ConstantPoolCache::base_offset(); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
553 // Big Endian: |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
554 __ lbz(Rscratch, in_bytes(cp_base_offset) + in_bytes(ConstantPoolCacheEntry::indices_offset()) + 7 - 2, Rcpool_cache); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
555 __ cmpwi(CCR0, Rscratch, Bytecodes::_getfield); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
556 __ bne(CCR0, Lslow_path); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
557 __ isync(); // Order succeeding loads wrt. load of _indices field from cpool_cache. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
558 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
559 // Finally, start loading the value: Get cp cache entry into regs. |
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parents:
diff
changeset
|
560 __ ld(Rflags, in_bytes(cp_base_offset) + in_bytes(ConstantPoolCacheEntry::flags_offset()), Rcpool_cache); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
561 __ ld(Roffset, in_bytes(cp_base_offset) + in_bytes(ConstantPoolCacheEntry::f2_offset()), Rcpool_cache); |
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parents:
diff
changeset
|
562 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
563 // Get field type. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
564 // (Rflags>>ConstantPoolCacheEntry::tos_state_shift)&((1<<ConstantPoolCacheEntry::tos_state_bits)-1) |
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parents:
diff
changeset
|
565 __ rldicl(Rflags, Rflags, 64-ConstantPoolCacheEntry::tos_state_shift, 64-ConstantPoolCacheEntry::tos_state_bits); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
566 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
567 #ifdef ASSERT |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
568 __ ld(R9_ARG7, 0, R1_SP); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
569 __ ld(R10_ARG8, 0, R21_sender_SP); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
570 __ cmpd(CCR0, R9_ARG7, R10_ARG8); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
571 __ asm_assert_eq("backlink", 0x543); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
572 #endif // ASSERT |
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parents:
diff
changeset
|
573 __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started. |
ec28f9c041ff
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parents:
diff
changeset
|
574 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
575 // Load the return value according to field type. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
576 Label Litos, Lltos, Lbtos, Lctos, Lstos; |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
577 __ cmpdi(CCR1, Rflags, itos); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
578 __ cmpdi(CCR0, Rflags, ltos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
579 __ beq(CCR1, Litos); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
580 __ beq(CCR0, Lltos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
581 __ cmpdi(CCR1, Rflags, btos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
582 __ cmpdi(CCR0, Rflags, ctos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
583 __ beq(CCR1, Lbtos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
584 __ beq(CCR0, Lctos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
585 __ cmpdi(CCR1, Rflags, stos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
586 __ beq(CCR1, Lstos); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
587 #ifdef ASSERT |
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parents:
diff
changeset
|
588 __ cmpdi(CCR0, Rflags, atos); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
589 __ asm_assert_eq("what type is this?", 0x432); |
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parents:
diff
changeset
|
590 #endif |
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parents:
diff
changeset
|
591 // fallthru: __ bind(Latos); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
592 __ load_heap_oop(R3_RET, (RegisterOrConstant)Roffset, Rthis); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
593 __ blr(); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
594 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
595 __ bind(Litos); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
596 __ lwax(R3_RET, Rthis, Roffset); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
597 __ blr(); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
598 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
599 __ bind(Lltos); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
600 __ ldx(R3_RET, Rthis, Roffset); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
601 __ blr(); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
602 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
603 __ bind(Lbtos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
604 __ lbzx(R3_RET, Rthis, Roffset); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
605 __ extsb(R3_RET, R3_RET); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
606 __ blr(); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
607 |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
608 __ bind(Lctos); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
609 __ lhzx(R3_RET, Rthis, Roffset); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
610 __ blr(); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
611 |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
612 __ bind(Lstos); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
613 __ lhax(R3_RET, Rthis, Roffset); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
614 __ blr(); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
615 |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
616 __ bind(Lslow_path); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
617 assert(Interpreter::entry_for_kind(Interpreter::zerolocals), "Normal entry must have been generated by now"); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
618 __ load_const_optimized(Rscratch, Interpreter::entry_for_kind(Interpreter::zerolocals), R0); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
619 __ mtctr(Rscratch); |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
620 __ bctr(); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
621 __ flush(); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
622 |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
623 return entry; |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
624 } |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
625 |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
626 // Interpreter intrinsic for WeakReference.get(). |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
627 // 1. Don't push a full blown frame and go on dispatching, but fetch the value |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
628 // into R8 and return quickly |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
629 // 2. If G1 is active we *must* execute this intrinsic for corrrectness: |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
630 // It contains a GC barrier which puts the reference into the satb buffer |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
631 // to indicate that someone holds a strong reference to the object the |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
632 // weak ref points to! |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
633 address InterpreterGenerator::generate_Reference_get_entry(void) { |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
634 // Code: _aload_0, _getfield, _areturn |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
635 // parameter size = 1 |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
636 // |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
637 // The code that gets generated by this routine is split into 2 parts: |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
638 // 1. the "intrinsified" code for G1 (or any SATB based GC), |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
639 // 2. the slow path - which is an expansion of the regular method entry. |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
640 // |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
641 // Notes: |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
642 // * In the G1 code we do not check whether we need to block for |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
643 // a safepoint. If G1 is enabled then we must execute the specialized |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
644 // code for Reference.get (except when the Reference object is null) |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
645 // so that we can log the value in the referent field with an SATB |
ec28f9c041ff
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parents:
diff
changeset
|
646 // update buffer. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
647 // If the code for the getfield template is modified so that the |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
648 // G1 pre-barrier code is executed when the current method is |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
649 // Reference.get() then going through the normal method entry |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
650 // will be fine. |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
goetz
parents:
diff
changeset
|
651 // * The G1 code can, however, check the receiver object (the instance |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
652 // of java.lang.Reference) and jump to the slow path if null. If the |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
653 // Reference object is null then we obviously cannot fetch the referent |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
654 // and so we don't need to call the G1 pre-barrier. Thus we can use the |
ec28f9c041ff
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goetz
parents:
diff
changeset
|
655 // regular method entry code to generate the NPE. |
ec28f9c041ff
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goetz
parents:
diff
changeset
|
656 // |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
657 // This code is based on generate_accessor_enty. |
ec28f9c041ff
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parents:
diff
changeset
|
658 |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
659 address entry = __ pc(); |
ec28f9c041ff
8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
diff
changeset
|
660 |
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8019972: PPC64 (part 9): platform files for interpreter only VM.
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parents:
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changeset
|
661 const int referent_offset = java_lang_ref_Reference::referent_offset; |
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662 guarantee(referent_offset > 0, "referent offset not initialized"); |
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663 |
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664 if (UseG1GC) { |
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665 Label slow_path; |
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666 |
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667 // Debugging not possible, so can't use __ skip_if_jvmti_mode(slow_path, GR31_SCRATCH); |
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668 |
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669 // In the G1 code we don't check if we need to reach a safepoint. We |
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670 // continue and the thread will safepoint at the next bytecode dispatch. |
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671 |
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672 // If the receiver is null then it is OK to jump to the slow path. |
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673 #ifdef CC_INTERP |
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674 __ ld(R3_RET, Interpreter::stackElementSize, R17_tos); // get receiver |
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675 #else |
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676 Unimplemented(); |
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677 #endif |
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678 |
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679 // Check if receiver == NULL and go the slow path. |
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680 __ cmpdi(CCR0, R3_RET, 0); |
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681 __ beq(CCR0, slow_path); |
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682 |
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683 // Load the value of the referent field. |
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684 __ load_heap_oop_not_null(R3_RET, referent_offset, R3_RET); |
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685 |
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686 // Generate the G1 pre-barrier code to log the value of |
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687 // the referent field in an SATB buffer. Note with |
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688 // these parameters the pre-barrier does not generate |
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689 // the load of the previous value. |
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690 |
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691 // Restore caller sp for c2i case. |
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692 #ifdef ASSERT |
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693 __ ld(R9_ARG7, 0, R1_SP); |
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694 __ ld(R10_ARG8, 0, R21_sender_SP); |
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695 __ cmpd(CCR0, R9_ARG7, R10_ARG8); |
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696 __ asm_assert_eq("backlink", 0x544); |
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697 #endif // ASSERT |
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698 __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started. |
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699 |
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700 __ g1_write_barrier_pre(noreg, // obj |
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701 noreg, // offset |
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702 R3_RET, // pre_val |
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703 R11_scratch1, // tmp |
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704 R12_scratch2, // tmp |
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705 true); // needs_frame |
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706 |
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707 __ blr(); |
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708 |
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709 // Generate regular method entry. |
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710 __ bind(slow_path); |
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711 assert(Interpreter::entry_for_kind(Interpreter::zerolocals), "Normal entry must have been generated by now"); |
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712 __ load_const_optimized(R11_scratch1, Interpreter::entry_for_kind(Interpreter::zerolocals), R0); |
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713 __ mtctr(R11_scratch1); |
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714 __ bctr(); |
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715 __ flush(); |
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716 |
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717 return entry; |
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718 } else { |
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719 return generate_accessor_entry(); |
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720 } |
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721 } |
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722 |
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723 void Deoptimization::unwind_callee_save_values(frame* f, vframeArray* vframe_array) { |
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724 // This code is sort of the equivalent of C2IAdapter::setup_stack_frame back in |
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725 // the days we had adapter frames. When we deoptimize a situation where a |
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726 // compiled caller calls a compiled caller will have registers it expects |
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727 // to survive the call to the callee. If we deoptimize the callee the only |
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728 // way we can restore these registers is to have the oldest interpreter |
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729 // frame that we create restore these values. That is what this routine |
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730 // will accomplish. |
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731 |
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732 // At the moment we have modified c2 to not have any callee save registers |
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733 // so this problem does not exist and this routine is just a place holder. |
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734 |
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735 assert(f->is_interpreted_frame(), "must be interpreted"); |
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736 } |