Mercurial > hg > graal-compiler

annotate src/cpu/x86/vm/compiledIC_x86.cpp @ 18041:52b4284cb496

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Merge with jdk8u20-b26
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 16:02:50 +0200
parents 5c71dcf0915d 78bbf4d43a14
children 72a3e3995879
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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
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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, address mark) {
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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 if (mark == NULL) {
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88 mark = cbuf.insts_mark(); // Get mark within main instrs section.
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89 }
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90
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91 // Note that the code buffer's insts_mark is always relative to insts.
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92 // That's why we must use the macroassembler to generate a stub.
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93 MacroAssembler _masm(&cbuf);
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94
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95 address base =
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96 __ start_a_stub(to_interp_stub_size());
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97 guarantee(base != NULL, "out of space");
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98
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99 // Static stub relocation stores the instruction address of the call.
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100 __ relocate(static_stub_Relocation::spec(mark), Assembler::imm_operand);
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101 // Static stub relocation also tags the Method* in the code-stream.
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102 __ mov_metadata(rbx, (Metadata*) NULL); // Method is zapped till fixup time.
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103 // This is recognized as unresolved by relocs/nativeinst/ic code.
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104 __ jump(RuntimeAddress(__ pc()));
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105
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106 assert(__ pc() - base <= to_interp_stub_size(), "wrong stub size");
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107
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108 // Update current stubs pointer and restore insts_end.
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109 __ end_a_stub();
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110 }
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111 #undef __
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112
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113 int CompiledStaticCall::to_interp_stub_size() {
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114 return NOT_LP64(10) // movl; jmp
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115 LP64_ONLY(15); // movq (1+1+8); jmp (1+4)
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116 }
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117
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118 // Relocation entries for call stub, compiled java to interpreter.
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119 int CompiledStaticCall::reloc_to_interp_stub() {
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120 return 4; // 3 in emit_to_interp_stub + 1 in emit_call
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121 }
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122
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123 void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
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124 address stub = find_stub();
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125 guarantee(stub != NULL, "stub not found");
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126
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127 if (TraceICs) {
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128 ResourceMark rm;
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129 tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
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130 p2i(instruction_address()),
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131 callee->name_and_sig_as_C_string());
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132 }
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133
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134 // Creation also verifies the object.
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135 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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136 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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137
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138 assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
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139 "a) MT-unsafe modification of inline cache");
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140 assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
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141 "b) MT-unsafe modification of inline cache");
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142
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143 // Update stub.
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144 method_holder->set_data((intptr_t)callee());
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145 jump->set_jump_destination(entry);
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146
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147 // Update jump to call.
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148 set_destination_mt_safe(stub);
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149 }
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150
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151 void CompiledStaticCall::set_stub_to_clean(static_stub_Relocation* static_stub) {
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152 assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
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153 // Reset stub.
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154 address stub = static_stub->addr();
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155 assert(stub != NULL, "stub not found");
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156 // Creation also verifies the object.
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157 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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158 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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159 method_holder->set_data(0);
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160 jump->set_jump_destination((address)-1);
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161 }
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162
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163 //-----------------------------------------------------------------------------
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164 // Non-product mode code
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165 #ifndef PRODUCT
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166
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167 void CompiledStaticCall::verify() {
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168 // Verify call.
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169 NativeCall::verify();
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170 if (os::is_MP()) {
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171 verify_alignment();
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172 }
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173
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174 // Verify stub.
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175 address stub = find_stub();
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176 assert(stub != NULL, "no stub found for static call");
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177 // Creation also verifies the object.
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178 NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
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179 NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
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180
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181 // Verify state.
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182 assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
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183 }
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184
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185 #endif // !PRODUCT