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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/stubs/UncommonTrapStub.java @ 21720:d915361cc3a1

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moved asm, bytecode and asm.test code back to com.oracle.graal name space (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Thu, 04 Jun 2015 13:35:47 +0200
parents 6df25b1418be
children 0e095e2c24e2
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1 /*
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2 * Copyright (c) 2013, 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 package com.oracle.graal.hotspot.stubs;
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24
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25 import com.oracle.jvmci.code.Register;
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26 import com.oracle.jvmci.code.TargetDescription;
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27 import com.oracle.jvmci.meta.NamedLocationIdentity;
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28 import com.oracle.jvmci.meta.LocationIdentity;
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29 import com.oracle.jvmci.meta.ForeignCallDescriptor;
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30
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31 import static com.oracle.graal.hotspot.HotSpotBackend.*;
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32 import static com.oracle.graal.hotspot.HotSpotBackend.Options.*;
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33 import static com.oracle.graal.hotspot.replacements.HotSpotReplacementsUtil.*;
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34
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35 import com.oracle.graal.api.replacements.*;
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36 import com.oracle.graal.asm.*;
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37 import com.oracle.graal.graph.Node.ConstantNodeParameter;
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38 import com.oracle.graal.graph.Node.NodeIntrinsic;
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39 import com.oracle.graal.hotspot.*;
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40 import com.oracle.graal.hotspot.meta.*;
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41 import com.oracle.graal.hotspot.nodes.*;
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42 import com.oracle.graal.replacements.*;
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43 import com.oracle.graal.replacements.Snippet.ConstantParameter;
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44 import com.oracle.graal.word.*;
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45 import com.oracle.jvmci.common.*;
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46
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47 /**
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48 * Uncommon trap stub.
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49 *
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50 * This is the entry point for code which is returning to a de-optimized frame.
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51 *
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52 * The steps taken by this frame are as follows:
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53 *
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54 * <li>push a dummy "register_save" and save the return values (O0, O1, F0/F1, G1) and all
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55 * potentially live registers (at a pollpoint many registers can be live).
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56 *
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57 * <li>call the C routine: Deoptimization::fetch_unroll_info (this function returns information
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58 * about the number and size of interpreter frames which are equivalent to the frame which is being
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59 * deoptimized)
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60 *
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61 * <li>deallocate the unpack frame, restoring only results values. Other volatile registers will now
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62 * be captured in the vframeArray as needed.
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63 *
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64 * <li>deallocate the deoptimization frame
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65 *
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66 * <li>in a loop using the information returned in the previous step push new interpreter frames
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67 * (take care to propagate the return values through each new frame pushed)
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68 *
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69 * <li>create a dummy "unpack_frame" and save the return values (O0, O1, F0)
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70 *
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71 * <li>call the C routine: Deoptimization::unpack_frames (this function lays out values on the
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72 * interpreter frame which was just created)
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73 *
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74 * <li>deallocate the dummy unpack_frame
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75 *
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76 * <li>ensure that all the return values are correctly set and then do a return to the interpreter
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77 * entry point
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78 *
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79 * <p>
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80 * <b>ATTENTION: We cannot do any complicated operations e.g. logging via printf in this snippet
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81 * because we change the current stack layout and so the code is very sensitive to register
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82 * allocation.</b>
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83 */
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84 public class UncommonTrapStub extends SnippetStub {
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85
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86 public static final LocationIdentity STACK_BANG_LOCATION = NamedLocationIdentity.mutable("stack bang");
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87
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88 private final TargetDescription target;
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89
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90 public UncommonTrapStub(HotSpotProviders providers, TargetDescription target, HotSpotForeignCallLinkage linkage) {
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91 super(UncommonTrapStub.class, "uncommonTrapHandler", providers, linkage);
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92 this.target = target;
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93 assert PreferGraalStubs.getValue();
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94 }
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95
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96 @Override
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97 public boolean preservesRegisters() {
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98 return false;
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99 }
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100
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101 @Override
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102 protected Object getConstantParameterValue(int index, String name) {
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103 switch (index) {
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104 case 0:
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105 return providers.getRegisters().getThreadRegister();
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106 case 1:
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107 return providers.getRegisters().getStackPointerRegister();
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108 default:
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109 throw JVMCIError.shouldNotReachHere("unknown parameter " + name + " at index " + index);
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110 }
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111 }
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112
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113 /**
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114 * Uncommon trap handler.
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115 *
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116 * We save the argument return registers. We call the first C routine, fetch_unroll_info(). This
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117 * routine captures the return values and returns a structure which describes the current frame
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118 * size and the sizes of all replacement frames. The current frame is compiled code and may
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119 * contain many inlined functions, each with their own JVM state. We pop the current frame, then
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120 * push all the new frames. Then we call the C routine unpack_frames() to populate these frames.
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121 * Finally unpack_frames() returns us the new target address. Notice that callee-save registers
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122 * are BLOWN here; they have already been captured in the vframeArray at the time the return PC
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123 * was patched.
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124 */
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125 @Snippet
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126 private static void uncommonTrapHandler(@ConstantParameter Register threadRegister, @ConstantParameter Register stackPointerRegister) {
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127 final Word thread = registerAsWord(threadRegister);
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128 final long registerSaver = SaveAllRegistersNode.saveAllRegisters();
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129
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130 final int actionAndReason = readPendingDeoptimization(thread);
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131 writePendingDeoptimization(thread, -1);
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132
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133 final Word unrollBlock = UncommonTrapCallNode.uncommonTrap(registerSaver, actionAndReason);
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134
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135 // Pop all the frames we must move/replace.
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136 //
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137 // Frame picture (youngest to oldest)
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138 // 1: self-frame
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139 // 2: deoptimizing frame
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140 // 3: caller of deoptimizing frame (could be compiled/interpreted).
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141
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142 // Pop self-frame.
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143 LeaveCurrentStackFrameNode.leaveCurrentStackFrame(registerSaver);
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144
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145 // Load the initial info we should save (e.g. frame pointer).
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146 final Word initialInfo = unrollBlock.readWord(deoptimizationUnrollBlockInitialInfoOffset());
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147
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148 // Pop deoptimized frame.
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149 final int sizeOfDeoptimizedFrame = unrollBlock.readInt(deoptimizationUnrollBlockSizeOfDeoptimizedFrameOffset());
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150 LeaveDeoptimizedStackFrameNode.leaveDeoptimizedStackFrame(sizeOfDeoptimizedFrame, initialInfo);
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151
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152 /*
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153 * Stack bang to make sure there's enough room for the interpreter frames. Bang stack for
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154 * total size of the interpreter frames plus shadow page size. Bang one page at a time
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155 * because large sizes can bang beyond yellow and red zones.
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1cde96b96673 Fixed code format issues.
Roland Schatz <roland.schatz@oracle.com>
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156 *
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157 * @deprecated This code should go away as soon as JDK-8032410 hits the Graal repository.
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158 */
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159 final int totalFrameSizes = unrollBlock.readInt(deoptimizationUnrollBlockTotalFrameSizesOffset());
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160 final int bangPages = NumUtil.roundUp(totalFrameSizes, pageSize()) / pageSize() + stackShadowPages();
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161 Word stackPointer = readRegister(stackPointerRegister);
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162
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163 for (int i = 1; i < bangPages; i++) {
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164 stackPointer.writeInt((-i * pageSize()) + stackBias(), 0, STACK_BANG_LOCATION);
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165 }
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166
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167 // Load number of interpreter frames.
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168 final int numberOfFrames = unrollBlock.readInt(deoptimizationUnrollBlockNumberOfFramesOffset());
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169
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170 // Load address of array of frame sizes.
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171 final Word frameSizes = unrollBlock.readWord(deoptimizationUnrollBlockFrameSizesOffset());
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172
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173 // Load address of array of frame PCs.
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174 final Word framePcs = unrollBlock.readWord(deoptimizationUnrollBlockFramePcsOffset());
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175
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176 /*
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177 * Get the current stack pointer (sender's original SP) before adjustment so that we can
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178 * save it in the skeletal interpreter frame.
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179 */
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180 Word senderSp = readRegister(stackPointerRegister);
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181
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182 // Adjust old interpreter frame to make space for new frame's extra Java locals.
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183 final int callerAdjustment = unrollBlock.readInt(deoptimizationUnrollBlockCallerAdjustmentOffset());
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184 writeRegister(stackPointerRegister, readRegister(stackPointerRegister).subtract(callerAdjustment));
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185
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186 for (int i = 0; i < numberOfFrames; i++) {
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187 final Word frameSize = frameSizes.readWord(i * wordSize());
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188 final Word framePc = framePcs.readWord(i * wordSize());
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189
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190 // Push an interpreter frame onto the stack.
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191 PushInterpreterFrameNode.pushInterpreterFrame(frameSize, framePc, senderSp, initialInfo);
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192
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193 // Get the current stack pointer (sender SP) and pass it to next frame.
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194 senderSp = readRegister(stackPointerRegister);
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195 }
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196
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197 // Get final return address.
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198 final Word framePc = framePcs.readWord(numberOfFrames * wordSize());
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199
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200 /*
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201 * Enter a frame to call out to unpack frames. Since we changed the stack pointer to an
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202 * unknown alignment we need to align it here before calling C++ code.
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203 */
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204 final Word senderFp = initialInfo;
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205 EnterUnpackFramesStackFrameNode.enterUnpackFramesStackFrame(framePc, senderSp, senderFp, registerSaver);
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206
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207 // Pass uncommon trap mode to unpack frames.
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208 final int mode = deoptimizationUnpackUncommonTrap();
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209 unpackFrames(UNPACK_FRAMES, thread, mode);
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210
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211 LeaveUnpackFramesStackFrameNode.leaveUnpackFramesStackFrame(registerSaver);
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212 }
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213
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214 /**
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215 * Reads the value of the passed register as a Word.
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216 */
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217 private static Word readRegister(Register register) {
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218 return registerAsWord(register, false, false);
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219 }
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220
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221 /**
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222 * Writes the value of the passed register.
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223 *
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224 * @param value value the register should be set to
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225 */
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226 private static void writeRegister(Register register, Word value) {
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227 writeRegisterAsWord(register, value);
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228 }
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229
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230 @Fold
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231 private static int stackShadowPages() {
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232 return config().useStackBanging ? config().stackShadowPages : 0;
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233 }
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234
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235 /**
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236 * Returns the stack bias for the host architecture.
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237 *
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238 * @deprecated This method should go away as soon as JDK-8032410 hits the Graal repository.
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239 *
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240 * @return stack bias
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241 */
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242 @Deprecated
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243 @Fold
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244 private static int stackBias() {
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245 return config().stackBias;
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246 }
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247
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248 @Fold
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249 private static int deoptimizationUnrollBlockSizeOfDeoptimizedFrameOffset() {
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250 return config().deoptimizationUnrollBlockSizeOfDeoptimizedFrameOffset;
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251 }
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252
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253 @Fold
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254 private static int deoptimizationUnrollBlockCallerAdjustmentOffset() {
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255 return config().deoptimizationUnrollBlockCallerAdjustmentOffset;
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256 }
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257
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258 @Fold
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259 private static int deoptimizationUnrollBlockNumberOfFramesOffset() {
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260 return config().deoptimizationUnrollBlockNumberOfFramesOffset;
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261 }
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262
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263 @Fold
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264 private static int deoptimizationUnrollBlockTotalFrameSizesOffset() {
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265 return config().deoptimizationUnrollBlockTotalFrameSizesOffset;
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266 }
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267
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268 @Fold
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269 private static int deoptimizationUnrollBlockFrameSizesOffset() {
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270 return config().deoptimizationUnrollBlockFrameSizesOffset;
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271 }
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272
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273 @Fold
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274 private static int deoptimizationUnrollBlockFramePcsOffset() {
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275 return config().deoptimizationUnrollBlockFramePcsOffset;
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276 }
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277
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278 @Fold
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279 private static int deoptimizationUnrollBlockInitialInfoOffset() {
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280 return config().deoptimizationUnrollBlockInitialInfoOffset;
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281 }
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282
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283 @Fold
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284 private static int deoptimizationUnpackDeopt() {
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285 return config().deoptimizationUnpackDeopt;
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286 }
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287
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288 @Fold
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289 private static int deoptimizationUnpackUncommonTrap() {
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290 return config().deoptimizationUnpackUncommonTrap;
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291 }
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292
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293 @NodeIntrinsic(value = StubForeignCallNode.class, setStampFromReturnType = true)
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294 public static native int unpackFrames(@ConstantNodeParameter ForeignCallDescriptor unpackFrames, Word thread, int mode);
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295 }