Mercurial > hg > truffle
annotate src/cpu/ppc/vm/compiledIC_ppc.cpp @ 20347:3374ec4c4448
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author | amurillo |
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date | Tue, 26 Aug 2014 13:38:33 -0700 |
parents | c64b6b0c40c8 |
children | 327e7269f90d |
rev | line source |
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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 #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 void 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 Compile::current()->env()->record_out_of_memory_failure(); |
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110 return; |
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111 } |
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112 |
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113 // For java_to_interp stubs we use R11_scratch1 as scratch register |
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114 // and in call trampoline stubs we use R12_scratch2. This way we |
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115 // can distinguish them (see is_NativeCallTrampolineStub_at()). |
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116 Register reg_scratch = R11_scratch1; |
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117 |
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118 // Create a static stub relocation which relates this stub |
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119 // with the call instruction at insts_call_instruction_offset in the |
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120 // instructions code-section. |
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121 __ relocate(static_stub_Relocation::spec(call_addr)); |
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122 const int stub_start_offset = __ offset(); |
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123 |
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124 // Now, create the stub's code: |
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125 // - load the TOC |
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126 // - load the inline cache oop from the constant pool |
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127 // - load the call target from the constant pool |
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128 // - call |
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129 __ calculate_address_from_global_toc(reg_scratch, __ method_toc()); |
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130 AddressLiteral ic = __ allocate_metadata_address((Metadata *)NULL); |
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131 __ load_const_from_method_toc(as_Register(Matcher::inline_cache_reg_encode()), ic, reg_scratch); |
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132 |
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133 if (ReoptimizeCallSequences) { |
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134 __ b64_patchable((address)-1, relocInfo::none); |
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135 } else { |
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136 AddressLiteral a((address)-1); |
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137 __ load_const_from_method_toc(reg_scratch, a, reg_scratch); |
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138 __ mtctr(reg_scratch); |
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139 __ bctr(); |
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140 } |
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141 |
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142 // FIXME: Assert that the stub can be identified and patched. |
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143 |
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144 // Java_to_interp_stub_size should be good. |
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145 assert((__ offset() - stub_start_offset) <= CompiledStaticCall::to_interp_stub_size(), |
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146 "should be good size"); |
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147 assert(!is_NativeCallTrampolineStub_at(__ addr_at(stub_start_offset)), |
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148 "must not confuse java_to_interp with trampoline stubs"); |
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149 |
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150 // End the stub. |
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151 __ end_a_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 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 |