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1692
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1 /*
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1972
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
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1692
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3 * Copyright 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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1972
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26 #include "precompiled.hpp"
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27 #include "shark/llvmHeaders.hpp"
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28 #include "shark/sharkNativeWrapper.hpp"
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29 #include "shark/sharkType.hpp"
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1692
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30
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31 using namespace llvm;
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32
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33 void SharkNativeWrapper::initialize(const char *name) {
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34 // Create the function
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35 _function = Function::Create(
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36 SharkType::entry_point_type(),
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37 GlobalVariable::InternalLinkage,
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38 name);
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39
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40 // Get our arguments
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41 Function::arg_iterator ai = function()->arg_begin();
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42 Argument *method = ai++;
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43 method->setName("method");
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44 Argument *base_pc = ai++;
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45 base_pc->setName("base_pc");
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46 code_buffer()->set_base_pc(base_pc);
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47 Argument *thread = ai++;
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48 thread->setName("thread");
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49 set_thread(thread);
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50
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51 // Create and push our stack frame
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52 builder()->SetInsertPoint(CreateBlock());
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53 _stack = SharkStack::CreateBuildAndPushFrame(this, method);
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54 NOT_PRODUCT(method = NULL);
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55
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56 // Create the oopmap. We use the one oopmap for every call site in
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57 // the wrapper, which results in the odd mild inefficiency but is a
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58 // damn sight easier to code.
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59 OopMap *oopmap = new OopMap(
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60 SharkStack::oopmap_slot_munge(stack()->oopmap_frame_size()),
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61 SharkStack::oopmap_slot_munge(arg_size()));
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62 oopmap->set_oop(SharkStack::slot2reg(stack()->method_slot_offset()));
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63
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64 // Set up the oop_tmp slot if required:
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65 // - For static methods we use it to handlize the class argument
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66 // for the call, and to protect the same during slow path locks
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67 // (if synchronized).
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68 // - For methods returning oops, we use it to protect the return
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69 // value across safepoints or slow path unlocking.
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70 if (is_static() || is_returning_oop()) {
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71 _oop_tmp_slot = stack()->slot_addr(
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72 stack()->oop_tmp_slot_offset(),
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73 SharkType::oop_type(),
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74 "oop_tmp_slot");
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75
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76 oopmap->set_oop(SharkStack::slot2reg(stack()->oop_tmp_slot_offset()));
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77 }
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78
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79 // Set up the monitor slot, for synchronized methods
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80 if (is_synchronized()) {
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81 Unimplemented();
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82 _lock_slot_offset = 23;
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83 }
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84
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85 // Start building the argument list
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86 std::vector<const Type*> param_types;
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87 std::vector<Value*> param_values;
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88 const PointerType *box_type = PointerType::getUnqual(SharkType::oop_type());
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89
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90 // First argument is the JNIEnv
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91 param_types.push_back(SharkType::jniEnv_type());
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92 param_values.push_back(
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93 builder()->CreateAddressOfStructEntry(
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94 thread,
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95 JavaThread::jni_environment_offset(),
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96 SharkType::jniEnv_type(),
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97 "jni_environment"));
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98
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99 // For static methods, the second argument is the class
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100 if (is_static()) {
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101 builder()->CreateStore(
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102 builder()->CreateInlineOop(
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103 JNIHandles::make_local(
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104 target()->method_holder()->klass_part()->java_mirror())),
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105 oop_tmp_slot());
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106
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107 param_types.push_back(box_type);
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108 param_values.push_back(oop_tmp_slot());
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109
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110 _receiver_slot_offset = stack()->oop_tmp_slot_offset();
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111 }
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112 else if (is_returning_oop()) {
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113 // The oop_tmp slot is registered in the oopmap,
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114 // so we need to clear it. This is one of the
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115 // mild inefficiencies I mentioned earlier.
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116 builder()->CreateStore(LLVMValue::null(), oop_tmp_slot());
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117 }
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118
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119 // Parse the arguments
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120 for (int i = 0; i < arg_size(); i++) {
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121 int slot_offset = stack()->locals_slots_offset() + arg_size() - 1 - i;
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122 int adjusted_offset = slot_offset;
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123 BasicBlock *null, *not_null, *merge;
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124 Value *box;
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125 PHINode *phi;
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126
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127 switch (arg_type(i)) {
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128 case T_VOID:
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129 break;
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130
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131 case T_OBJECT:
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132 case T_ARRAY:
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133 null = CreateBlock("null");
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134 not_null = CreateBlock("not_null");
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135 merge = CreateBlock("merge");
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136
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137 box = stack()->slot_addr(slot_offset, SharkType::oop_type());
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138 builder()->CreateCondBr(
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139 builder()->CreateICmp(
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140 ICmpInst::ICMP_EQ,
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141 builder()->CreateLoad(box),
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142 LLVMValue::null()),
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143 null, not_null);
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144
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145 builder()->SetInsertPoint(null);
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146 builder()->CreateBr(merge);
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147
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148 builder()->SetInsertPoint(not_null);
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149 builder()->CreateBr(merge);
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150
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151 builder()->SetInsertPoint(merge);
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152 phi = builder()->CreatePHI(box_type, "boxed_object");
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153 phi->addIncoming(ConstantPointerNull::get(box_type), null);
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154 phi->addIncoming(box, not_null);
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155 box = phi;
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156
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157 param_types.push_back(box_type);
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158 param_values.push_back(box);
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159
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160 oopmap->set_oop(SharkStack::slot2reg(slot_offset));
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161
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162 if (i == 0 && !is_static())
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163 _receiver_slot_offset = slot_offset;
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164
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165 break;
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166
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167 case T_LONG:
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168 case T_DOUBLE:
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169 adjusted_offset--;
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170 // fall through
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171
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172 default:
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173 const Type *param_type = SharkType::to_stackType(arg_type(i));
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174
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175 param_types.push_back(param_type);
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176 param_values.push_back(
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177 builder()->CreateLoad(stack()->slot_addr(adjusted_offset, param_type)));
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178 }
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179 }
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180
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181 // The oopmap is now complete, and everything is written
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182 // into the frame except the PC.
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183 int pc_offset = code_buffer()->create_unique_offset();
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184
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185 _oop_maps = new OopMapSet();
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186 oop_maps()->add_gc_map(pc_offset, oopmap);
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187
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188 builder()->CreateStore(
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189 builder()->code_buffer_address(pc_offset),
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190 stack()->slot_addr(stack()->pc_slot_offset()));
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191
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192 // Set up the Java frame anchor
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193 stack()->CreateSetLastJavaFrame();
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194
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195 // Lock if necessary
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196 if (is_synchronized())
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197 Unimplemented();
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198
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199 // Change the thread state to _thread_in_native
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200 CreateSetThreadState(_thread_in_native);
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201
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202 // Make the call
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203 BasicType result_type = target()->result_type();
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204 const Type* return_type;
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205 if (result_type == T_VOID)
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206 return_type = SharkType::void_type();
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207 else if (is_returning_oop())
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208 return_type = box_type;
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209 else
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210 return_type = SharkType::to_arrayType(result_type);
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211 Value* native_function = builder()->CreateIntToPtr(
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212 LLVMValue::intptr_constant((intptr_t) target()->native_function()),
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213 PointerType::getUnqual(
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214 FunctionType::get(return_type, param_types, false)));
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215 Value *result = builder()->CreateCall(
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216 native_function, param_values.begin(), param_values.end());
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217
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218 // Start the transition back to _thread_in_Java
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219 CreateSetThreadState(_thread_in_native_trans);
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220
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221 // Make sure new state is visible in the GC thread
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222 if (os::is_MP()) {
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223 if (UseMembar)
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224 builder()->CreateMemoryBarrier(SharkBuilder::BARRIER_STORELOAD);
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225 else
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226 CreateWriteMemorySerializePage();
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227 }
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228
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229 // Handle safepoint operations, pending suspend requests,
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230 // and pending asynchronous exceptions.
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231 BasicBlock *check_thread = CreateBlock("check_thread");
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232 BasicBlock *do_safepoint = CreateBlock("do_safepoint");
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233 BasicBlock *safepointed = CreateBlock("safepointed");
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234
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235 Value *global_state = builder()->CreateLoad(
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236 builder()->CreateIntToPtr(
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237 LLVMValue::intptr_constant(
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238 (intptr_t) SafepointSynchronize::address_of_state()),
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239 PointerType::getUnqual(SharkType::jint_type())),
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240 "global_state");
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241
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242 builder()->CreateCondBr(
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243 builder()->CreateICmpNE(
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244 global_state,
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245 LLVMValue::jint_constant(SafepointSynchronize::_not_synchronized)),
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246 do_safepoint, check_thread);
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247
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248 builder()->SetInsertPoint(check_thread);
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249 Value *thread_state = builder()->CreateValueOfStructEntry(
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250 thread,
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251 JavaThread::suspend_flags_offset(),
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252 SharkType::jint_type(),
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253 "thread_state");
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254
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255 builder()->CreateCondBr(
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256 builder()->CreateICmpNE(
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257 thread_state,
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258 LLVMValue::jint_constant(0)),
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259 do_safepoint, safepointed);
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260
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261 builder()->SetInsertPoint(do_safepoint);
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262 builder()->CreateCall(
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263 builder()->check_special_condition_for_native_trans(), thread);
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264 builder()->CreateBr(safepointed);
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265
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266 // Finally we can change the thread state to _thread_in_Java
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267 builder()->SetInsertPoint(safepointed);
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268 CreateSetThreadState(_thread_in_Java);
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269
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270 // Clear the frame anchor
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271 stack()->CreateResetLastJavaFrame();
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272
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273 // If there is a pending exception then we can just unwind and
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274 // return. It seems totally wrong that unlocking is skipped here
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275 // but apparently the template interpreter does this so we do too.
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276 BasicBlock *exception = CreateBlock("exception");
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277 BasicBlock *no_exception = CreateBlock("no_exception");
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278
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279 builder()->CreateCondBr(
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280 builder()->CreateICmpEQ(
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281 CreateLoadPendingException(),
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282 LLVMValue::null()),
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283 no_exception, exception);
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284
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285 builder()->SetInsertPoint(exception);
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286 CreateResetHandleBlock();
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287 stack()->CreatePopFrame(0);
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288 builder()->CreateRet(LLVMValue::jint_constant(0));
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289
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290 builder()->SetInsertPoint(no_exception);
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291
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292 // If the result was an oop then unbox it before
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293 // releasing the handle it might be protected by
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294 if (is_returning_oop()) {
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295 BasicBlock *null = builder()->GetInsertBlock();
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296 BasicBlock *not_null = CreateBlock("not_null");
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297 BasicBlock *merge = CreateBlock("merge");
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298
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299 builder()->CreateCondBr(
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300 builder()->CreateICmpNE(result, ConstantPointerNull::get(box_type)),
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301 not_null, merge);
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302
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303 builder()->SetInsertPoint(not_null);
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304 Value *unboxed_result = builder()->CreateLoad(result);
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305 builder()->CreateBr(merge);
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306
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307 builder()->SetInsertPoint(merge);
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308 PHINode *phi = builder()->CreatePHI(SharkType::oop_type(), "result");
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309 phi->addIncoming(LLVMValue::null(), null);
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310 phi->addIncoming(unboxed_result, not_null);
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311 result = phi;
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312 }
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313
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314 // Reset handle block
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315 CreateResetHandleBlock();
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316
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317 // Unlock if necessary.
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318 if (is_synchronized())
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319 Unimplemented();
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320
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321 // Unwind and return
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322 Value *result_addr = stack()->CreatePopFrame(type2size[result_type]);
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323 if (result_type != T_VOID) {
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324 bool needs_cast = false;
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325 bool is_signed = false;
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326 switch (result_type) {
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327 case T_BOOLEAN:
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328 result = builder()->CreateICmpNE(result, LLVMValue::jbyte_constant(0));
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329 needs_cast = true;
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330 break;
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331
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332 case T_CHAR:
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333 needs_cast = true;
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334 break;
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335
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336 case T_BYTE:
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337 case T_SHORT:
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338 needs_cast = true;
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339 is_signed = true;
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340 break;
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341 }
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342 if (needs_cast) {
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343 result = builder()->CreateIntCast(
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344 result, SharkType::to_stackType(result_type), is_signed);
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345 }
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346
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347 builder()->CreateStore(
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348 result,
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349 builder()->CreateIntToPtr(
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350 result_addr,
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351 PointerType::getUnqual(SharkType::to_stackType(result_type))));
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352 }
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353 builder()->CreateRet(LLVMValue::jint_constant(0));
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354 }
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