annotate src/cpu/ppc/vm/compiledIC_ppc.cpp @ 24000:c3d0bd36ab28

8130309: Need to bailout cleanly if creation of stubs fails when codecache is out of space Summary: Check for failed expansion of stub section in code buffer and bailout. Reviewed-by: kvn, thartmann
author vkempik
date Thu, 21 Apr 2016 16:19:33 +0300
parents 327e7269f90d
children
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1 /*
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "asm/macroAssembler.inline.hpp"
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27 #include "code/compiledIC.hpp"
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28 #include "code/icBuffer.hpp"
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29 #include "code/nmethod.hpp"
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30 #include "memory/resourceArea.hpp"
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31 #include "runtime/mutexLocker.hpp"
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32 #include "runtime/safepoint.hpp"
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33 #ifdef COMPILER2
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34 #include "opto/matcher.hpp"
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35 #endif
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36
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37 // Release the CompiledICHolder* associated with this call site is there is one.
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38 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
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39 // This call site might have become stale so inspect it carefully.
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40 NativeCall* call = nativeCall_at(call_site->addr());
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41 if (is_icholder_entry(call->destination())) {
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42 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
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43 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
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44 }
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45 }
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46
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47 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
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48 // This call site might have become stale so inspect it carefully.
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49 NativeCall* call = nativeCall_at(call_site->addr());
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50 return is_icholder_entry(call->destination());
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51 }
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52
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53 // ----------------------------------------------------------------------------
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54
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55 // A PPC CompiledStaticCall looks like this:
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56 //
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57 // >>>> consts
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58 //
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59 // [call target1]
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60 // [IC cache]
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61 // [call target2]
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62 //
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63 // <<<< consts
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64 // >>>> insts
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65 //
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66 // bl offset16 -+ -+ ??? // How many bits available?
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67 // | |
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68 // <<<< insts | |
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69 // >>>> stubs | |
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70 // | |- trampoline_stub_Reloc
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71 // trampoline stub: | <-+
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72 // r2 = toc |
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73 // r2 = [r2 + offset] | // Load call target1 from const section
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74 // mtctr r2 |
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75 // bctr |- static_stub_Reloc
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76 // comp_to_interp_stub: <---+
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77 // r1 = toc
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78 // ICreg = [r1 + IC_offset] // Load IC from const section
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79 // r1 = [r1 + offset] // Load call target2 from const section
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80 // mtctr r1
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81 // bctr
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82 //
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83 // <<<< stubs
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84 //
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85 // The call instruction in the code either
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86 // - branches directly to a compiled method if offset encodable in instruction
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87 // - branches to the trampoline stub if offset to compiled method not encodable
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88 // - branches to the compiled_to_interp stub if target interpreted
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89 //
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90 // Further there are three relocations from the loads to the constants in
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91 // the constant section.
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92 //
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93 // Usage of r1 and r2 in the stubs allows to distinguish them.
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94
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95 const int IC_pos_in_java_to_interp_stub = 8;
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96 #define __ _masm.
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97 address CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) {
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98 #ifdef COMPILER2
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99 // Get the mark within main instrs section which is set to the address of the call.
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100 address call_addr = cbuf.insts_mark();
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101
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102 // Note that the code buffer's insts_mark is always relative to insts.
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103 // That's why we must use the macroassembler to generate a stub.
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104 MacroAssembler _masm(&cbuf);
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105
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106 // Start the stub.
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107 address stub = __ start_a_stub(CompiledStaticCall::to_interp_stub_size());
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108 if (stub == NULL) {
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109 return NULL; // CodeCache is full
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110 }
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111
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112 // For java_to_interp stubs we use R11_scratch1 as scratch register
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113 // and in call trampoline stubs we use R12_scratch2. This way we
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114 // can distinguish them (see is_NativeCallTrampolineStub_at()).
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115 Register reg_scratch = R11_scratch1;
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116
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117 // Create a static stub relocation which relates this stub
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118 // with the call instruction at insts_call_instruction_offset in the
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119 // instructions code-section.
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120 __ relocate(static_stub_Relocation::spec(call_addr));
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121 const int stub_start_offset = __ offset();
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122
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123 // Now, create the stub's code:
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124 // - load the TOC
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125 // - load the inline cache oop from the constant pool
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126 // - load the call target from the constant pool
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127 // - call
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128 __ calculate_address_from_global_toc(reg_scratch, __ method_toc());
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129 AddressLiteral ic = __ allocate_metadata_address((Metadata *)NULL);
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130 __ load_const_from_method_toc(as_Register(Matcher::inline_cache_reg_encode()), ic, reg_scratch);
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131
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132 if (ReoptimizeCallSequences) {
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133 __ b64_patchable((address)-1, relocInfo::none);
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134 } else {
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135 AddressLiteral a((address)-1);
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136 __ load_const_from_method_toc(reg_scratch, a, reg_scratch);
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137 __ mtctr(reg_scratch);
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138 __ bctr();
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139 }
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140
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141 // FIXME: Assert that the stub can be identified and patched.
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142
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143 // Java_to_interp_stub_size should be good.
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144 assert((__ offset() - stub_start_offset) <= CompiledStaticCall::to_interp_stub_size(),
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145 "should be good size");
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146 assert(!is_NativeCallTrampolineStub_at(__ addr_at(stub_start_offset)),
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147 "must not confuse java_to_interp with trampoline stubs");
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148
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149 // End the stub.
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150 __ end_a_stub();
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151 return stub;
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152 #else
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153 ShouldNotReachHere();
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154 #endif
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155 }
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156 #undef __
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157
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158 // Size of java_to_interp stub, this doesn't need to be accurate but it must
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159 // be larger or equal to the real size of the stub.
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160 // Used for optimization in Compile::Shorten_branches.
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161 int CompiledStaticCall::to_interp_stub_size() {
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162 return 12 * BytesPerInstWord;
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163 }
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164
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165 // Relocation entries for call stub, compiled java to interpreter.
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166 // Used for optimization in Compile::Shorten_branches.
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167 int CompiledStaticCall::reloc_to_interp_stub() {
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168 return 5;
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169 }
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170
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171 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
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172 address stub = find_stub();
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173 guarantee(stub != NULL, "stub not found");
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174
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175 if (TraceICs) {
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176 ResourceMark rm;
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177 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
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178 p2i(instruction_address()),
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179 callee->name_and_sig_as_C_string());
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180 }
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181
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182 // Creation also verifies the object.
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183 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub);
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184 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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185
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186 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
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187 "a) MT-unsafe modification of inline cache");
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188 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
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189 "b) MT-unsafe modification of inline cache");
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190
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191 // Update stub.
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192 method_holder->set_data((intptr_t)callee());
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193 jump->set_jump_destination(entry);
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194
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195 // Update jump to call.
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196 set_destination_mt_safe(stub);
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197 }
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198
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199 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
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200 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
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201 // Reset stub.
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202 address stub = static_stub->addr();
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203 assert(stub != NULL, "stub not found");
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204 // Creation also verifies the object.
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205 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub);
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206 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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207 method_holder->set_data(0);
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208 jump->set_jump_destination((address)-1);
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209 }
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210
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211 //-----------------------------------------------------------------------------
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212 // Non-product mode code
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213 #ifndef PRODUCT
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214
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215 void CompiledStaticCall::verify() {
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216 // Verify call.
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217 NativeCall::verify();
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218 if (os::is_MP()) {
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219 verify_alignment();
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220 }
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221
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222 // Verify stub.
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223 address stub = find_stub();
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224 assert(stub != NULL, "no stub found for static call");
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225 // Creation also verifies the object.
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226 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + IC_pos_in_java_to_interp_stub);
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227 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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228
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229 // Verify state.
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230 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
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231 }
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232
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233 #endif // !PRODUCT