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