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annotate src/cpu/x86/vm/compiledIC_x86.cpp @ 17716:cdb71841f4bc

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6498581: ThreadInterruptTest3 produces wrong output on Windows Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set. Reviewed-by: acorn, kvn Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com
author minqi
date Wed, 26 Feb 2014 15:20:41 -0800
parents a6e09d6dd8e5
children 36bcc10e01c0 78bbf4d43a14
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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 * 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
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34 // Release the CompiledICHolder* associated with this call site is there is one.
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35 void CompiledIC::cleanup_call_site(virtual_call_Relocation* call_site) {
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36 // This call site might have become stale so inspect it carefully.
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37 NativeCall* call = nativeCall_at(call_site->addr());
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38 if (is_icholder_entry(call->destination())) {
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39 NativeMovConstReg* value = nativeMovConstReg_at(call_site->cached_value());
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40 InlineCacheBuffer::queue_for_release((CompiledICHolder*)value->data());
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41 }
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42 }
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43
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44 bool CompiledIC::is_icholder_call_site(virtual_call_Relocation* call_site) {
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45 // This call site might have become stale so inspect it carefully.
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46 NativeCall* call = nativeCall_at(call_site->addr());
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47 return is_icholder_entry(call->destination());
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48 }
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49
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50 //-----------------------------------------------------------------------------
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51 // High-level access to an inline cache. Guaranteed to be MT-safe.
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52
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53 CompiledIC::CompiledIC(nmethod* nm, NativeCall* call)
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54 : _ic_call(call)
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55 {
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56 address ic_call = call->instruction_address();
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57
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58 assert(ic_call != NULL, "ic_call address must be set");
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59 assert(nm != NULL, "must pass nmethod");
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60 assert(nm->contains(ic_call), "must be in nmethod");
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61
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62 // Search for the ic_call at the given address.
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63 RelocIterator iter(nm, ic_call, ic_call+1);
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64 bool ret = iter.next();
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65 assert(ret == true, "relocInfo must exist at this address");
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66 assert(iter.addr() == ic_call, "must find ic_call");
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67 if (iter.type() == relocInfo::virtual_call_type) {
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68 virtual_call_Relocation* r = iter.virtual_call_reloc();
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69 _is_optimized = false;
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70 _value = nativeMovConstReg_at(r->cached_value());
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71 } else {
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72 assert(iter.type() == relocInfo::opt_virtual_call_type, "must be a virtual call");
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73 _is_optimized = true;
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74 _value = NULL;
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75 }
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76 }
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77
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78 // ----------------------------------------------------------------------------
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79
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80 #define __ _masm.
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81 void CompiledStaticCall::emit_to_interp_stub(CodeBuffer &cbuf) {
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82 // Stub is fixed up when the corresponding call is converted from
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83 // calling compiled code to calling interpreted code.
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84 // movq rbx, 0
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85 // jmp -5 # to self
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86
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87 address mark = cbuf.insts_mark(); // Get mark within main instrs section.
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88
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89 // Note that the code buffer's insts_mark is always relative to insts.
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90 // That's why we must use the macroassembler to generate a stub.
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91 MacroAssembler _masm(&cbuf);
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92
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93 address base =
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94 __ start_a_stub(to_interp_stub_size()*2);
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95 if (base == NULL) return; // CodeBuffer::expand failed.
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96 // Static stub relocation stores the instruction address of the call.
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97 __ relocate(static_stub_Relocation::spec(mark), Assembler::imm_operand);
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98 // Static stub relocation also tags the Method* in the code-stream.
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99 __ mov_metadata(rbx, (Metadata*) NULL); // Method is zapped till fixup time.
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100 // This is recognized as unresolved by relocs/nativeinst/ic code.
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101 __ jump(RuntimeAddress(__ pc()));
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102
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103 // Update current stubs pointer and restore insts_end.
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104 __ end_a_stub();
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105 }
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106 #undef __
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107
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108 int CompiledStaticCall::to_interp_stub_size() {
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109 return NOT_LP64(10) // movl; jmp
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110 LP64_ONLY(15); // movq (1+1+8); jmp (1+4)
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111 }
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112
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113 // Relocation entries for call stub, compiled java to interpreter.
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114 int CompiledStaticCall::reloc_to_interp_stub() {
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115 return 4; // 3 in emit_to_interp_stub + 1 in emit_call
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116 }
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117
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118 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
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119 address stub = find_stub();
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120 guarantee(stub != NULL, "stub not found");
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121
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122 if (TraceICs) {
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123 ResourceMark rm;
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124 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
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125 instruction_address(),
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126 callee->name_and_sig_as_C_string());
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127 }
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128
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129 // Creation also verifies the object.
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130 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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131 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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132
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133 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
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134 "a) MT-unsafe modification of inline cache");
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135 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
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136 "b) MT-unsafe modification of inline cache");
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137
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138 // Update stub.
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139 method_holder->set_data((intptr_t)callee());
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140 jump->set_jump_destination(entry);
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141
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142 // Update jump to call.
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143 set_destination_mt_safe(stub);
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144 }
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145
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146 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
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147 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
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148 // Reset stub.
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149 address stub = static_stub->addr();
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150 assert(stub != NULL, "stub not found");
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151 // Creation also verifies the object.
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152 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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153 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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154 method_holder->set_data(0);
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155 jump->set_jump_destination((address)-1);
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156 }
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157
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158 //-----------------------------------------------------------------------------
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159 // Non-product mode code
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160 #ifndef PRODUCT
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161
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162 void CompiledStaticCall::verify() {
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163 // Verify call.
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164 NativeCall::verify();
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165 if (os::is_MP()) {
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166 verify_alignment();
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167 }
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168
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169 // Verify stub.
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170 address stub = find_stub();
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171 assert(stub != NULL, "no stub found for static call");
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172 // Creation also verifies the object.
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173 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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174 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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175
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176 // Verify state.
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177 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
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178 }
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179
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180 #endif // !PRODUCT