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1692
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1 /*
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2 * Copyright (c) 1999, 2007, 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 "incls/_precompiled.incl"
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27 #include "incls/_sharkStack.cpp.incl"
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28
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29 using namespace llvm;
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30
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31 void SharkStack::initialize(Value* method) {
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32 bool setup_sp_and_method = (method != NULL);
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33
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34 int locals_words = max_locals();
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35 int extra_locals = locals_words - arg_size();
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36 int header_words = SharkFrame::header_words;
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37 int monitor_words = max_monitors()*frame::interpreter_frame_monitor_size();
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38 int stack_words = max_stack();
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39 int frame_words = header_words + monitor_words + stack_words;
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40
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41 _extended_frame_size = frame_words + locals_words;
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42
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43 // Update the stack pointer
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44 Value *stack_pointer = builder()->CreateSub(
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45 CreateLoadStackPointer(),
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46 LLVMValue::intptr_constant((frame_words + extra_locals) * wordSize));
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47 CreateStackOverflowCheck(stack_pointer);
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48 if (setup_sp_and_method)
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49 CreateStoreStackPointer(stack_pointer);
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50
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51 // Create the frame
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52 _frame = builder()->CreateIntToPtr(
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53 stack_pointer,
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54 PointerType::getUnqual(
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55 ArrayType::get(SharkType::intptr_type(), extended_frame_size())),
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56 "frame");
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57 int offset = 0;
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58
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59 // Expression stack
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60 _stack_slots_offset = offset;
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61 offset += stack_words;
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62
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63 // Monitors
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64 _monitors_slots_offset = offset;
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65 offset += monitor_words;
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66
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67 // Temporary oop slot
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68 _oop_tmp_slot_offset = offset++;
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69
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70 // Method pointer
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71 _method_slot_offset = offset++;
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72 if (setup_sp_and_method) {
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73 builder()->CreateStore(
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74 method, slot_addr(method_slot_offset(), SharkType::methodOop_type()));
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75 }
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76
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77 // Unextended SP
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78 builder()->CreateStore(stack_pointer, slot_addr(offset++));
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79
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80 // PC
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81 _pc_slot_offset = offset++;
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82
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83 // Frame header
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84 builder()->CreateStore(
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85 LLVMValue::intptr_constant(ZeroFrame::SHARK_FRAME), slot_addr(offset++));
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86 Value *fp = slot_addr(offset++);
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87
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88 // Local variables
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89 _locals_slots_offset = offset;
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90 offset += locals_words;
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91
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92 // Push the frame
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93 assert(offset == extended_frame_size(), "should do");
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94 builder()->CreateStore(CreateLoadFramePointer(), fp);
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95 CreateStoreFramePointer(
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96 builder()->CreatePtrToInt(fp, SharkType::intptr_type()));
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97 }
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98
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99 // This function should match ZeroStack::overflow_check
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100 void SharkStack::CreateStackOverflowCheck(Value* sp) {
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101 BasicBlock *zero_ok = CreateBlock("zero_stack_ok");
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102 BasicBlock *overflow = CreateBlock("stack_overflow");
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103 BasicBlock *abi_ok = CreateBlock("abi_stack_ok");
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104
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105 // Check the Zero stack
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106 builder()->CreateCondBr(
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107 builder()->CreateICmpULT(sp, stack_base()),
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108 overflow, zero_ok);
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109
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110 // Check the ABI stack
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111 builder()->SetInsertPoint(zero_ok);
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112 Value *stack_top = builder()->CreateSub(
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113 builder()->CreateValueOfStructEntry(
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114 thread(),
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115 Thread::stack_base_offset(),
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116 SharkType::intptr_type(),
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117 "abi_base"),
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118 builder()->CreateValueOfStructEntry(
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119 thread(),
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120 Thread::stack_size_offset(),
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121 SharkType::intptr_type(),
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122 "abi_size"));
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123 Value *free_stack = builder()->CreateSub(
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124 builder()->CreatePtrToInt(
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125 builder()->CreateGetFrameAddress(),
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126 SharkType::intptr_type(),
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127 "abi_sp"),
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128 stack_top);
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129 builder()->CreateCondBr(
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130 builder()->CreateICmpULT(
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131 free_stack,
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132 LLVMValue::intptr_constant(StackShadowPages * os::vm_page_size())),
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133 overflow, abi_ok);
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134
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135 // Handle overflows
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136 builder()->SetInsertPoint(overflow);
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137 builder()->CreateCall(builder()->throw_StackOverflowError(), thread());
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138 builder()->CreateRet(LLVMValue::jint_constant(0));
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139
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140 builder()->SetInsertPoint(abi_ok);
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141 }
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142
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143 Value* SharkStack::CreatePopFrame(int result_slots) {
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144 assert(result_slots >= 0 && result_slots <= 2, "should be");
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145 int locals_to_pop = max_locals() - result_slots;
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146
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147 Value *fp = CreateLoadFramePointer();
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148 Value *sp = builder()->CreateAdd(
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149 fp,
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150 LLVMValue::intptr_constant((1 + locals_to_pop) * wordSize));
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151
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152 CreateStoreStackPointer(sp);
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153 CreateStoreFramePointer(
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154 builder()->CreateLoad(
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155 builder()->CreateIntToPtr(
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156 fp, PointerType::getUnqual(SharkType::intptr_type()))));
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157
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158 return sp;
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159 }
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160
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161 Value* SharkStack::slot_addr(int offset,
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162 const Type* type,
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163 const char* name) const {
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164 bool needs_cast = type && type != SharkType::intptr_type();
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165
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166 Value* result = builder()->CreateStructGEP(
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167 _frame, offset, needs_cast ? "" : name);
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168
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169 if (needs_cast) {
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170 result = builder()->CreateBitCast(
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171 result, PointerType::getUnqual(type), name);
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172 }
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173 return result;
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174 }
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175
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176 // The bits that differentiate stacks with normal and native frames on top
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177
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178 SharkStack* SharkStack::CreateBuildAndPushFrame(SharkFunction* function,
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179 Value* method) {
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180 return new SharkStackWithNormalFrame(function, method);
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181 }
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182 SharkStack* SharkStack::CreateBuildAndPushFrame(SharkNativeWrapper* wrapper,
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183 Value* method) {
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184 return new SharkStackWithNativeFrame(wrapper, method);
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185 }
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186
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187 SharkStackWithNormalFrame::SharkStackWithNormalFrame(SharkFunction* function,
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188 Value* method)
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189 : SharkStack(function), _function(function) {
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190 // For normal frames, the stack pointer and the method slot will
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191 // be set during each decache, so it is not necessary to do them
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192 // at the time the frame is created. However, we set them for
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193 // non-PRODUCT builds to make crash dumps easier to understand.
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194 initialize(PRODUCT_ONLY(NULL) NOT_PRODUCT(method));
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195 }
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196 SharkStackWithNativeFrame::SharkStackWithNativeFrame(SharkNativeWrapper* wrp,
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197 Value* method)
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198 : SharkStack(wrp), _wrapper(wrp) {
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199 initialize(method);
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200 }
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201
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202 int SharkStackWithNormalFrame::arg_size() const {
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203 return function()->arg_size();
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204 }
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205 int SharkStackWithNativeFrame::arg_size() const {
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206 return wrapper()->arg_size();
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207 }
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208
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209 int SharkStackWithNormalFrame::max_locals() const {
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210 return function()->max_locals();
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211 }
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212 int SharkStackWithNativeFrame::max_locals() const {
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213 return wrapper()->arg_size();
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214 }
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215
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216 int SharkStackWithNormalFrame::max_stack() const {
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217 return function()->max_stack();
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218 }
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219 int SharkStackWithNativeFrame::max_stack() const {
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220 return 0;
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221 }
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222
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223 int SharkStackWithNormalFrame::max_monitors() const {
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224 return function()->max_monitors();
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225 }
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226 int SharkStackWithNativeFrame::max_monitors() const {
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227 return wrapper()->is_synchronized() ? 1 : 0;
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228 }
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229
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230 BasicBlock* SharkStackWithNormalFrame::CreateBlock(const char* name) const {
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231 return function()->CreateBlock(name);
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232 }
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233 BasicBlock* SharkStackWithNativeFrame::CreateBlock(const char* name) const {
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234 return wrapper()->CreateBlock(name);
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235 }
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236
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237 address SharkStackWithNormalFrame::interpreter_entry_point() const {
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238 return (address) CppInterpreter::normal_entry;
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239 }
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240 address SharkStackWithNativeFrame::interpreter_entry_point() const {
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241 return (address) CppInterpreter::native_entry;
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242 }
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243
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244 #ifndef PRODUCT
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245 void SharkStack::CreateAssertLastJavaSPIsNull() const {
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246 #ifdef ASSERT
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247 BasicBlock *fail = CreateBlock("assert_failed");
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248 BasicBlock *pass = CreateBlock("assert_ok");
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249
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250 builder()->CreateCondBr(
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251 builder()->CreateICmpEQ(
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252 builder()->CreateLoad(last_Java_sp_addr()),
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253 LLVMValue::intptr_constant(0)),
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254 pass, fail);
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255
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256 builder()->SetInsertPoint(fail);
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257 builder()->CreateShouldNotReachHere(__FILE__, __LINE__);
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258 builder()->CreateUnreachable();
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259
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260 builder()->SetInsertPoint(pass);
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261 #endif // ASSERT
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262 }
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263 #endif // !PRODUCT
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