1 /* |
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2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * Copyright 2008, 2009, 2010 Red Hat, Inc. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 #include "precompiled.hpp" |
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27 #include "shark/llvmHeaders.hpp" |
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28 #include "shark/sharkFunction.hpp" |
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29 #include "shark/sharkNativeWrapper.hpp" |
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30 #include "shark/sharkStack.hpp" |
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31 #include "shark/sharkType.hpp" |
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32 |
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33 using namespace llvm; |
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34 |
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35 void SharkStack::initialize(Value* method) { |
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36 bool setup_sp_and_method = (method != NULL); |
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37 |
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38 int locals_words = max_locals(); |
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39 int extra_locals = locals_words - arg_size(); |
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40 int header_words = SharkFrame::header_words; |
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41 int monitor_words = max_monitors()*frame::interpreter_frame_monitor_size(); |
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42 int stack_words = max_stack(); |
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43 int frame_words = header_words + monitor_words + stack_words; |
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44 |
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45 _extended_frame_size = frame_words + locals_words; |
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46 |
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47 // Update the stack pointer |
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48 Value *stack_pointer = builder()->CreateSub( |
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49 CreateLoadStackPointer(), |
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50 LLVMValue::intptr_constant((frame_words + extra_locals) * wordSize)); |
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51 CreateStackOverflowCheck(stack_pointer); |
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52 if (setup_sp_and_method) |
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53 CreateStoreStackPointer(stack_pointer); |
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54 |
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55 // Create the frame |
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56 _frame = builder()->CreateIntToPtr( |
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57 stack_pointer, |
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58 PointerType::getUnqual( |
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59 ArrayType::get(SharkType::intptr_type(), extended_frame_size())), |
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60 "frame"); |
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61 int offset = 0; |
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62 |
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63 // Expression stack |
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64 _stack_slots_offset = offset; |
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65 offset += stack_words; |
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66 |
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67 // Monitors |
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68 _monitors_slots_offset = offset; |
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69 offset += monitor_words; |
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70 |
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71 // Temporary oop slot |
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72 _oop_tmp_slot_offset = offset++; |
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73 |
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74 // Method pointer |
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75 _method_slot_offset = offset++; |
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76 if (setup_sp_and_method) { |
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77 builder()->CreateStore( |
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78 method, slot_addr(method_slot_offset(), SharkType::Method_type())); |
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79 } |
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80 |
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81 // Unextended SP |
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82 builder()->CreateStore(stack_pointer, slot_addr(offset++)); |
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83 |
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84 // PC |
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85 _pc_slot_offset = offset++; |
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86 |
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87 // Frame header |
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88 builder()->CreateStore( |
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89 LLVMValue::intptr_constant(ZeroFrame::SHARK_FRAME), slot_addr(offset++)); |
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90 Value *fp = slot_addr(offset++); |
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91 |
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92 // Local variables |
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93 _locals_slots_offset = offset; |
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94 offset += locals_words; |
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95 |
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96 // Push the frame |
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97 assert(offset == extended_frame_size(), "should do"); |
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98 builder()->CreateStore(CreateLoadFramePointer(), fp); |
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99 CreateStoreFramePointer( |
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100 builder()->CreatePtrToInt(fp, SharkType::intptr_type())); |
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101 } |
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102 |
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103 // This function should match ZeroStack::overflow_check |
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104 void SharkStack::CreateStackOverflowCheck(Value* sp) { |
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105 BasicBlock *zero_ok = CreateBlock("zero_stack_ok"); |
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106 BasicBlock *overflow = CreateBlock("stack_overflow"); |
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107 BasicBlock *abi_ok = CreateBlock("abi_stack_ok"); |
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108 |
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109 // Check the Zero stack |
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110 builder()->CreateCondBr( |
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111 builder()->CreateICmpULT(sp, stack_base()), |
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112 overflow, zero_ok); |
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113 |
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114 // Check the ABI stack |
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115 builder()->SetInsertPoint(zero_ok); |
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116 Value *stack_top = builder()->CreateSub( |
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117 builder()->CreateValueOfStructEntry( |
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118 thread(), |
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119 Thread::stack_base_offset(), |
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120 SharkType::intptr_type(), |
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121 "abi_base"), |
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122 builder()->CreateValueOfStructEntry( |
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123 thread(), |
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124 Thread::stack_size_offset(), |
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125 SharkType::intptr_type(), |
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126 "abi_size")); |
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127 Value *free_stack = builder()->CreateSub( |
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128 builder()->CreatePtrToInt( |
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129 builder()->CreateGetFrameAddress(), |
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130 SharkType::intptr_type(), |
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131 "abi_sp"), |
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132 stack_top); |
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133 builder()->CreateCondBr( |
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134 builder()->CreateICmpULT( |
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135 free_stack, |
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136 LLVMValue::intptr_constant(JavaThread::stack_shadow_zone_size())), |
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137 overflow, abi_ok); |
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138 |
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139 // Handle overflows |
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140 builder()->SetInsertPoint(overflow); |
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141 builder()->CreateCall(builder()->throw_StackOverflowError(), thread()); |
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142 builder()->CreateRet(LLVMValue::jint_constant(0)); |
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143 |
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144 builder()->SetInsertPoint(abi_ok); |
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145 } |
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146 |
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147 Value* SharkStack::CreatePopFrame(int result_slots) { |
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148 assert(result_slots >= 0 && result_slots <= 2, "should be"); |
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149 int locals_to_pop = max_locals() - result_slots; |
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150 |
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151 Value *fp = CreateLoadFramePointer(); |
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152 Value *sp = builder()->CreateAdd( |
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153 fp, |
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154 LLVMValue::intptr_constant((1 + locals_to_pop) * wordSize)); |
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155 |
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156 CreateStoreStackPointer(sp); |
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157 CreateStoreFramePointer( |
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158 builder()->CreateLoad( |
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159 builder()->CreateIntToPtr( |
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160 fp, PointerType::getUnqual(SharkType::intptr_type())))); |
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161 |
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162 return sp; |
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163 } |
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164 |
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165 Value* SharkStack::slot_addr(int offset, |
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166 Type* type, |
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167 const char* name) const { |
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168 bool needs_cast = type && type != SharkType::intptr_type(); |
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169 |
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170 Value* result = builder()->CreateStructGEP( |
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171 _frame, offset, needs_cast ? "" : name); |
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172 |
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173 if (needs_cast) { |
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174 result = builder()->CreateBitCast( |
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175 result, PointerType::getUnqual(type), name); |
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176 } |
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177 return result; |
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178 } |
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179 |
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180 // The bits that differentiate stacks with normal and native frames on top |
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181 |
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182 SharkStack* SharkStack::CreateBuildAndPushFrame(SharkFunction* function, |
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183 Value* method) { |
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184 return new SharkStackWithNormalFrame(function, method); |
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185 } |
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186 SharkStack* SharkStack::CreateBuildAndPushFrame(SharkNativeWrapper* wrapper, |
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187 Value* method) { |
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188 return new SharkStackWithNativeFrame(wrapper, method); |
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189 } |
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190 |
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191 SharkStackWithNormalFrame::SharkStackWithNormalFrame(SharkFunction* function, |
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192 Value* method) |
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193 : SharkStack(function), _function(function) { |
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194 // For normal frames, the stack pointer and the method slot will |
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195 // be set during each decache, so it is not necessary to do them |
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196 // at the time the frame is created. However, we set them for |
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197 // non-PRODUCT builds to make crash dumps easier to understand. |
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198 initialize(PRODUCT_ONLY(NULL) NOT_PRODUCT(method)); |
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199 } |
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200 SharkStackWithNativeFrame::SharkStackWithNativeFrame(SharkNativeWrapper* wrp, |
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201 Value* method) |
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202 : SharkStack(wrp), _wrapper(wrp) { |
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203 initialize(method); |
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204 } |
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205 |
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206 int SharkStackWithNormalFrame::arg_size() const { |
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207 return function()->arg_size(); |
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208 } |
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209 int SharkStackWithNativeFrame::arg_size() const { |
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210 return wrapper()->arg_size(); |
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211 } |
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212 |
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213 int SharkStackWithNormalFrame::max_locals() const { |
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214 return function()->max_locals(); |
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215 } |
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216 int SharkStackWithNativeFrame::max_locals() const { |
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217 return wrapper()->arg_size(); |
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218 } |
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219 |
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220 int SharkStackWithNormalFrame::max_stack() const { |
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221 return function()->max_stack(); |
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222 } |
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223 int SharkStackWithNativeFrame::max_stack() const { |
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224 return 0; |
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225 } |
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226 |
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227 int SharkStackWithNormalFrame::max_monitors() const { |
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228 return function()->max_monitors(); |
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229 } |
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230 int SharkStackWithNativeFrame::max_monitors() const { |
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231 return wrapper()->is_synchronized() ? 1 : 0; |
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232 } |
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233 |
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234 BasicBlock* SharkStackWithNormalFrame::CreateBlock(const char* name) const { |
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235 return function()->CreateBlock(name); |
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236 } |
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237 BasicBlock* SharkStackWithNativeFrame::CreateBlock(const char* name) const { |
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238 return wrapper()->CreateBlock(name); |
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239 } |
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240 |
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241 address SharkStackWithNormalFrame::interpreter_entry_point() const { |
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242 return (address) CppInterpreter::normal_entry; |
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243 } |
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244 address SharkStackWithNativeFrame::interpreter_entry_point() const { |
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245 return (address) CppInterpreter::native_entry; |
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246 } |
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247 |
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248 #ifndef PRODUCT |
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249 void SharkStack::CreateAssertLastJavaSPIsNull() const { |
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250 #ifdef ASSERT |
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251 BasicBlock *fail = CreateBlock("assert_failed"); |
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252 BasicBlock *pass = CreateBlock("assert_ok"); |
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253 |
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254 builder()->CreateCondBr( |
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255 builder()->CreateICmpEQ( |
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256 builder()->CreateLoad(last_Java_sp_addr()), |
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257 LLVMValue::intptr_constant(0)), |
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258 pass, fail); |
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259 |
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260 builder()->SetInsertPoint(fail); |
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261 builder()->CreateShouldNotReachHere(__FILE__, __LINE__); |
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262 builder()->CreateUnreachable(); |
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263 |
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264 builder()->SetInsertPoint(pass); |
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265 #endif // ASSERT |
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266 } |
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267 #endif // !PRODUCT |
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