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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 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/_sharkInliner.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 class SharkInlineBlock : public SharkBlock {
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32 public:
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33 SharkInlineBlock(ciMethod* target, SharkState* state)
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34 : SharkBlock(state, target),
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35 _outer_state(state),
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36 _entry_state(new SharkState(this)) {
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37 for (int i = target->max_locals() - 1; i >= 0; i--) {
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38 SharkValue *value = NULL;
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39 if (i < target->arg_size())
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40 value = outer_state()->pop();
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41 entry_state()->set_local(i, value);
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42 }
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43 }
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44
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45 private:
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46 SharkState* _outer_state;
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47 SharkState* _entry_state;
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48
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49 private:
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50 SharkState* outer_state() {
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51 return _outer_state;
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52 }
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53 SharkState* entry_state() {
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54 return _entry_state;
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55 }
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56
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57 public:
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58 void emit_IR() {
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59 parse_bytecode(0, target()->code_size());
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60 }
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61
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62 private:
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63 void do_return(BasicType type) {
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64 if (type != T_VOID) {
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65 SharkValue *result = pop_result(type);
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66 outer_state()->push(result);
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67 if (result->is_two_word())
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68 outer_state()->push(NULL);
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69 }
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70 }
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71 };
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72
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73 class SharkInlinerHelper : public StackObj {
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74 public:
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75 SharkInlinerHelper(ciMethod* target, SharkState* entry_state)
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76 : _target(target),
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77 _entry_state(entry_state),
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78 _iter(target) {}
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79
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80 private:
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81 ciBytecodeStream _iter;
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82 SharkState* _entry_state;
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83 ciMethod* _target;
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84
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85 public:
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86 ciBytecodeStream* iter() {
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87 return &_iter;
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88 }
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89 SharkState* entry_state() const {
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90 return _entry_state;
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91 }
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92 ciMethod* target() const {
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93 return _target;
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94 }
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95
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96 public:
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97 Bytecodes::Code bc() {
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98 return iter()->cur_bc();
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99 }
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100 int max_locals() const {
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101 return target()->max_locals();
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102 }
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103 int max_stack() const {
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104 return target()->max_stack();
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105 }
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106
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107 // Inlinability check
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108 public:
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109 bool is_inlinable();
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110
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111 private:
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112 void initialize_for_check();
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113
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114 bool do_getstatic() {
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115 return do_field_access(true, false);
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116 }
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117 bool do_getfield() {
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118 return do_field_access(true, true);
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119 }
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120 bool do_putfield() {
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121 return do_field_access(false, true);
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122 }
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123 bool do_field_access(bool is_get, bool is_field);
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124
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125 // Local variables for inlinability check
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126 private:
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127 bool* _locals;
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128
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129 public:
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130 bool* local_addr(int index) const {
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131 assert(index >= 0 && index < max_locals(), "bad local variable index");
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132 return &_locals[index];
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133 }
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134 bool local(int index) const {
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135 return *local_addr(index);
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136 }
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137 void set_local(int index, bool value) {
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138 *local_addr(index) = value;
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139 }
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140
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141 // Expression stack for inlinability check
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142 private:
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143 bool* _stack;
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144 bool* _sp;
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145
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146 public:
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147 int stack_depth() const {
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148 return _sp - _stack;
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149 }
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150 bool* stack_addr(int slot) const {
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151 assert(slot >= 0 && slot < stack_depth(), "bad stack slot");
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152 return &_sp[-(slot + 1)];
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153 }
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154 void push(bool value) {
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155 assert(stack_depth() < max_stack(), "stack overrun");
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156 *(_sp++) = value;
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157 }
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158 bool pop() {
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159 assert(stack_depth() > 0, "stack underrun");
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160 return *(--_sp);
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161 }
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162
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163 // Methods for two-word locals
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164 public:
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165 void push_pair_local(int index) {
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166 push(local(index));
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167 push(local(index + 1));
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168 }
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169 void pop_pair_local(int index) {
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170 set_local(index + 1, pop());
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171 set_local(index, pop());
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172 }
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173
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174 // Code generation
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175 public:
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176 void do_inline() {
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177 (new SharkInlineBlock(target(), entry_state()))->emit_IR();
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178 }
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179 };
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180
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181 // Quick checks so we can bail out before doing too much
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182 bool SharkInliner::may_be_inlinable(ciMethod *target) {
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183 // We can't inline native methods
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184 if (target->is_native())
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185 return false;
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186
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187 // Not much point inlining abstract ones, and in any
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188 // case we'd need a stack frame to throw the exception
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189 if (target->is_abstract())
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190 return false;
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191
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192 // Don't inline anything huge
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193 if (target->code_size() > SharkMaxInlineSize)
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194 return false;
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195
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196 // Monitors aren't allowed without a frame to put them in
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197 if (target->is_synchronized() || target->has_monitor_bytecodes())
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198 return false;
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199
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200 // We don't do control flow
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201 if (target->has_exception_handlers() || target->has_jsrs())
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202 return false;
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203
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204 // Don't try to inline constructors, as they must
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205 // eventually call Object.<init> which we can't inline.
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206 // Note that this catches <clinit> too, but why would
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207 // we be compiling that?
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208 if (target->is_initializer())
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209 return false;
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210
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211 // Mustn't inline Object.<init>
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212 // Should be caught by the above, but just in case...
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213 if (target->intrinsic_id() == vmIntrinsics::_Object_init)
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214 return false;
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215
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216 return true;
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217 }
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218
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219 // Full-on detailed check, for methods that pass the quick checks
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220 // Inlined methods have no stack frame, so we can't do anything
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221 // that would require one. This means no safepoints (and hence
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222 // no loops) and no VM calls. No VM calls means, amongst other
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223 // things, that no exceptions can be created, which means no null
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224 // checks or divide-by-zero checks are allowed. The lack of null
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225 // checks in particular would eliminate practically everything,
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226 // but we can get around that restriction by relying on the zero-
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227 // check eliminator to strip the checks. To do that, we need to
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228 // walk through the method, tracking which values are and are not
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229 // zero-checked.
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230 bool SharkInlinerHelper::is_inlinable() {
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231 ResourceMark rm;
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232 initialize_for_check();
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233
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234 SharkConstant *sc;
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235 bool a, b, c, d;
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236
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237 iter()->reset_to_bci(0);
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238 while (iter()->next() != ciBytecodeStream::EOBC()) {
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239 switch (bc()) {
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240 case Bytecodes::_nop:
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241 break;
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242
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243 case Bytecodes::_aconst_null:
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244 push(false);
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245 break;
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246
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247 case Bytecodes::_iconst_0:
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248 push(false);
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249 break;
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250 case Bytecodes::_iconst_m1:
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251 case Bytecodes::_iconst_1:
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252 case Bytecodes::_iconst_2:
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253 case Bytecodes::_iconst_3:
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254 case Bytecodes::_iconst_4:
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255 case Bytecodes::_iconst_5:
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256 push(true);
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257 break;
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258
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259 case Bytecodes::_lconst_0:
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260 push(false);
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261 push(false);
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262 break;
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263 case Bytecodes::_lconst_1:
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264 push(true);
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265 push(false);
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266 break;
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267
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268 case Bytecodes::_fconst_0:
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269 case Bytecodes::_fconst_1:
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270 case Bytecodes::_fconst_2:
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271 push(false);
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272 break;
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273
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274 case Bytecodes::_dconst_0:
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275 case Bytecodes::_dconst_1:
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276 push(false);
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277 push(false);
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278 break;
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279
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280 case Bytecodes::_bipush:
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281 push(iter()->get_constant_u1() != 0);
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282 break;
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283 case Bytecodes::_sipush:
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284 push(iter()->get_constant_u2() != 0);
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285 break;
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286
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287 case Bytecodes::_ldc:
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288 case Bytecodes::_ldc_w:
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289 case Bytecodes::_ldc2_w:
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290 sc = SharkConstant::for_ldc(iter());
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291 if (!sc->is_loaded())
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292 return false;
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293 push(sc->is_nonzero());
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294 if (sc->is_two_word())
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295 push(false);
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296 break;
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297
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298 case Bytecodes::_iload_0:
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299 case Bytecodes::_fload_0:
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300 case Bytecodes::_aload_0:
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301 push(local(0));
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302 break;
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303 case Bytecodes::_lload_0:
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304 case Bytecodes::_dload_0:
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305 push_pair_local(0);
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306 break;
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307
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308 case Bytecodes::_iload_1:
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309 case Bytecodes::_fload_1:
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310 case Bytecodes::_aload_1:
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311 push(local(1));
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312 break;
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313 case Bytecodes::_lload_1:
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314 case Bytecodes::_dload_1:
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315 push_pair_local(1);
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316 break;
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317
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318 case Bytecodes::_iload_2:
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319 case Bytecodes::_fload_2:
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320 case Bytecodes::_aload_2:
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321 push(local(2));
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322 break;
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323 case Bytecodes::_lload_2:
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324 case Bytecodes::_dload_2:
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325 push_pair_local(2);
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326 break;
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327
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328 case Bytecodes::_iload_3:
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329 case Bytecodes::_fload_3:
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330 case Bytecodes::_aload_3:
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331 push(local(3));
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332 break;
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333 case Bytecodes::_lload_3:
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334 case Bytecodes::_dload_3:
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335 push_pair_local(3);
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336 break;
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337
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338 case Bytecodes::_iload:
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339 case Bytecodes::_fload:
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340 case Bytecodes::_aload:
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341 push(local(iter()->get_index()));
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342 break;
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343 case Bytecodes::_lload:
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344 case Bytecodes::_dload:
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345 push_pair_local(iter()->get_index());
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346 break;
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347
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348 case Bytecodes::_istore_0:
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349 case Bytecodes::_fstore_0:
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350 case Bytecodes::_astore_0:
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351 set_local(0, pop());
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352 break;
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353 case Bytecodes::_lstore_0:
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354 case Bytecodes::_dstore_0:
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355 pop_pair_local(0);
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356 break;
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357
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358 case Bytecodes::_istore_1:
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359 case Bytecodes::_fstore_1:
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360 case Bytecodes::_astore_1:
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361 set_local(1, pop());
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362 break;
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363 case Bytecodes::_lstore_1:
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364 case Bytecodes::_dstore_1:
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365 pop_pair_local(1);
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366 break;
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367
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368 case Bytecodes::_istore_2:
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369 case Bytecodes::_fstore_2:
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370 case Bytecodes::_astore_2:
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371 set_local(2, pop());
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372 break;
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373 case Bytecodes::_lstore_2:
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374 case Bytecodes::_dstore_2:
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375 pop_pair_local(2);
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376 break;
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377
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378 case Bytecodes::_istore_3:
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379 case Bytecodes::_fstore_3:
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380 case Bytecodes::_astore_3:
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381 set_local(3, pop());
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382 break;
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383 case Bytecodes::_lstore_3:
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384 case Bytecodes::_dstore_3:
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385 pop_pair_local(3);
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386 break;
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387
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388 case Bytecodes::_istore:
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389 case Bytecodes::_fstore:
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390 case Bytecodes::_astore:
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391 set_local(iter()->get_index(), pop());
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392 break;
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393 case Bytecodes::_lstore:
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394 case Bytecodes::_dstore:
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395 pop_pair_local(iter()->get_index());
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396 break;
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397
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398 case Bytecodes::_pop:
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399 pop();
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400 break;
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401 case Bytecodes::_pop2:
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402 pop();
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403 pop();
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404 break;
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405 case Bytecodes::_swap:
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406 a = pop();
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407 b = pop();
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408 push(a);
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409 push(b);
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410 break;
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411 case Bytecodes::_dup:
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412 a = pop();
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413 push(a);
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414 push(a);
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415 break;
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416 case Bytecodes::_dup_x1:
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417 a = pop();
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418 b = pop();
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419 push(a);
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420 push(b);
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421 push(a);
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422 break;
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423 case Bytecodes::_dup_x2:
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424 a = pop();
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425 b = pop();
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426 c = pop();
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427 push(a);
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428 push(c);
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429 push(b);
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430 push(a);
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431 break;
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432 case Bytecodes::_dup2:
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433 a = pop();
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434 b = pop();
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435 push(b);
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436 push(a);
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437 push(b);
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438 push(a);
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439 break;
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440 case Bytecodes::_dup2_x1:
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441 a = pop();
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442 b = pop();
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443 c = pop();
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444 push(b);
|
|
|
445 push(a);
|
|
|
446 push(c);
|
|
|
447 push(b);
|
|
|
448 push(a);
|
|
|
449 break;
|
|
|
450 case Bytecodes::_dup2_x2:
|
|
|
451 a = pop();
|
|
|
452 b = pop();
|
|
|
453 c = pop();
|
|
|
454 d = pop();
|
|
|
455 push(b);
|
|
|
456 push(a);
|
|
|
457 push(d);
|
|
|
458 push(c);
|
|
|
459 push(b);
|
|
|
460 push(a);
|
|
|
461 break;
|
|
|
462
|
|
|
463 case Bytecodes::_getfield:
|
|
|
464 if (!do_getfield())
|
|
|
465 return false;
|
|
|
466 break;
|
|
|
467 case Bytecodes::_getstatic:
|
|
|
468 if (!do_getstatic())
|
|
|
469 return false;
|
|
|
470 break;
|
|
|
471 case Bytecodes::_putfield:
|
|
|
472 if (!do_putfield())
|
|
|
473 return false;
|
|
|
474 break;
|
|
|
475
|
|
|
476 case Bytecodes::_iadd:
|
|
|
477 case Bytecodes::_isub:
|
|
|
478 case Bytecodes::_imul:
|
|
|
479 case Bytecodes::_iand:
|
|
|
480 case Bytecodes::_ixor:
|
|
|
481 case Bytecodes::_ishl:
|
|
|
482 case Bytecodes::_ishr:
|
|
|
483 case Bytecodes::_iushr:
|
|
|
484 pop();
|
|
|
485 pop();
|
|
|
486 push(false);
|
|
|
487 break;
|
|
|
488 case Bytecodes::_ior:
|
|
|
489 a = pop();
|
|
|
490 b = pop();
|
|
|
491 push(a && b);
|
|
|
492 break;
|
|
|
493 case Bytecodes::_idiv:
|
|
|
494 case Bytecodes::_irem:
|
|
|
495 if (!pop())
|
|
|
496 return false;
|
|
|
497 pop();
|
|
|
498 push(false);
|
|
|
499 break;
|
|
|
500 case Bytecodes::_ineg:
|
|
|
501 break;
|
|
|
502
|
|
|
503 case Bytecodes::_ladd:
|
|
|
504 case Bytecodes::_lsub:
|
|
|
505 case Bytecodes::_lmul:
|
|
|
506 case Bytecodes::_land:
|
|
|
507 case Bytecodes::_lxor:
|
|
|
508 pop();
|
|
|
509 pop();
|
|
|
510 pop();
|
|
|
511 pop();
|
|
|
512 push(false);
|
|
|
513 push(false);
|
|
|
514 break;
|
|
|
515 case Bytecodes::_lor:
|
|
|
516 a = pop();
|
|
|
517 b = pop();
|
|
|
518 push(a && b);
|
|
|
519 break;
|
|
|
520 case Bytecodes::_ldiv:
|
|
|
521 case Bytecodes::_lrem:
|
|
|
522 pop();
|
|
|
523 if (!pop())
|
|
|
524 return false;
|
|
|
525 pop();
|
|
|
526 pop();
|
|
|
527 push(false);
|
|
|
528 push(false);
|
|
|
529 break;
|
|
|
530 case Bytecodes::_lneg:
|
|
|
531 break;
|
|
|
532 case Bytecodes::_lshl:
|
|
|
533 case Bytecodes::_lshr:
|
|
|
534 case Bytecodes::_lushr:
|
|
|
535 pop();
|
|
|
536 pop();
|
|
|
537 pop();
|
|
|
538 push(false);
|
|
|
539 push(false);
|
|
|
540 break;
|
|
|
541
|
|
|
542 case Bytecodes::_fadd:
|
|
|
543 case Bytecodes::_fsub:
|
|
|
544 case Bytecodes::_fmul:
|
|
|
545 case Bytecodes::_fdiv:
|
|
|
546 case Bytecodes::_frem:
|
|
|
547 pop();
|
|
|
548 pop();
|
|
|
549 push(false);
|
|
|
550 break;
|
|
|
551 case Bytecodes::_fneg:
|
|
|
552 break;
|
|
|
553
|
|
|
554 case Bytecodes::_dadd:
|
|
|
555 case Bytecodes::_dsub:
|
|
|
556 case Bytecodes::_dmul:
|
|
|
557 case Bytecodes::_ddiv:
|
|
|
558 case Bytecodes::_drem:
|
|
|
559 pop();
|
|
|
560 pop();
|
|
|
561 pop();
|
|
|
562 pop();
|
|
|
563 push(false);
|
|
|
564 push(false);
|
|
|
565 break;
|
|
|
566 case Bytecodes::_dneg:
|
|
|
567 break;
|
|
|
568
|
|
|
569 case Bytecodes::_iinc:
|
|
|
570 set_local(iter()->get_index(), false);
|
|
|
571 break;
|
|
|
572
|
|
|
573 case Bytecodes::_lcmp:
|
|
|
574 pop();
|
|
|
575 pop();
|
|
|
576 pop();
|
|
|
577 pop();
|
|
|
578 push(false);
|
|
|
579 break;
|
|
|
580
|
|
|
581 case Bytecodes::_fcmpl:
|
|
|
582 case Bytecodes::_fcmpg:
|
|
|
583 pop();
|
|
|
584 pop();
|
|
|
585 push(false);
|
|
|
586 break;
|
|
|
587
|
|
|
588 case Bytecodes::_dcmpl:
|
|
|
589 case Bytecodes::_dcmpg:
|
|
|
590 pop();
|
|
|
591 pop();
|
|
|
592 pop();
|
|
|
593 pop();
|
|
|
594 push(false);
|
|
|
595 break;
|
|
|
596
|
|
|
597 case Bytecodes::_i2l:
|
|
|
598 push(false);
|
|
|
599 break;
|
|
|
600 case Bytecodes::_i2f:
|
|
|
601 pop();
|
|
|
602 push(false);
|
|
|
603 break;
|
|
|
604 case Bytecodes::_i2d:
|
|
|
605 pop();
|
|
|
606 push(false);
|
|
|
607 push(false);
|
|
|
608 break;
|
|
|
609
|
|
|
610 case Bytecodes::_l2i:
|
|
|
611 case Bytecodes::_l2f:
|
|
|
612 pop();
|
|
|
613 pop();
|
|
|
614 push(false);
|
|
|
615 break;
|
|
|
616 case Bytecodes::_l2d:
|
|
|
617 pop();
|
|
|
618 pop();
|
|
|
619 push(false);
|
|
|
620 push(false);
|
|
|
621 break;
|
|
|
622
|
|
|
623 case Bytecodes::_f2i:
|
|
|
624 pop();
|
|
|
625 push(false);
|
|
|
626 break;
|
|
|
627 case Bytecodes::_f2l:
|
|
|
628 case Bytecodes::_f2d:
|
|
|
629 pop();
|
|
|
630 push(false);
|
|
|
631 push(false);
|
|
|
632 break;
|
|
|
633
|
|
|
634 case Bytecodes::_d2i:
|
|
|
635 case Bytecodes::_d2f:
|
|
|
636 pop();
|
|
|
637 pop();
|
|
|
638 push(false);
|
|
|
639 break;
|
|
|
640 case Bytecodes::_d2l:
|
|
|
641 pop();
|
|
|
642 pop();
|
|
|
643 push(false);
|
|
|
644 push(false);
|
|
|
645 break;
|
|
|
646
|
|
|
647 case Bytecodes::_i2b:
|
|
|
648 case Bytecodes::_i2c:
|
|
|
649 case Bytecodes::_i2s:
|
|
|
650 pop();
|
|
|
651 push(false);
|
|
|
652 break;
|
|
|
653
|
|
|
654 case Bytecodes::_return:
|
|
|
655 case Bytecodes::_ireturn:
|
|
|
656 case Bytecodes::_lreturn:
|
|
|
657 case Bytecodes::_freturn:
|
|
|
658 case Bytecodes::_dreturn:
|
|
|
659 case Bytecodes::_areturn:
|
|
|
660 break;
|
|
|
661
|
|
|
662 default:
|
|
|
663 return false;
|
|
|
664 }
|
|
|
665 }
|
|
|
666
|
|
|
667 return true;
|
|
|
668 }
|
|
|
669
|
|
|
670 void SharkInlinerHelper::initialize_for_check() {
|
|
|
671 _locals = NEW_RESOURCE_ARRAY(bool, max_locals());
|
|
|
672 _stack = NEW_RESOURCE_ARRAY(bool, max_stack());
|
|
|
673
|
|
|
674 memset(_locals, 0, max_locals() * sizeof(bool));
|
|
|
675 for (int i = 0; i < target()->arg_size(); i++) {
|
|
|
676 SharkValue *arg = entry_state()->stack(target()->arg_size() - 1 - i);
|
|
|
677 if (arg && arg->zero_checked())
|
|
|
678 set_local(i, true);
|
|
|
679 }
|
|
|
680
|
|
|
681 _sp = _stack;
|
|
|
682 }
|
|
|
683
|
|
|
684 bool SharkInlinerHelper::do_field_access(bool is_get, bool is_field) {
|
|
|
685 assert(is_get || is_field, "can't inline putstatic");
|
|
|
686
|
|
|
687 // If the holder isn't linked then there isn't a lot we can do
|
|
|
688 if (!target()->holder()->is_linked())
|
|
|
689 return false;
|
|
|
690
|
|
|
691 // Get the field
|
|
|
692 bool will_link;
|
|
|
693 ciField *field = iter()->get_field(will_link);
|
|
|
694 if (!will_link)
|
|
|
695 return false;
|
|
|
696
|
|
|
697 // If the field is mismatched then an exception needs throwing
|
|
|
698 if (is_field == field->is_static())
|
|
|
699 return false;
|
|
|
700
|
|
|
701 // Pop the value off the stack if necessary
|
|
|
702 if (!is_get) {
|
|
|
703 pop();
|
|
|
704 if (field->type()->is_two_word())
|
|
|
705 pop();
|
|
|
706 }
|
|
|
707
|
|
|
708 // Pop and null-check the receiver if necessary
|
|
|
709 if (is_field) {
|
|
|
710 if (!pop())
|
|
|
711 return false;
|
|
|
712 }
|
|
|
713
|
|
|
714 // Push the result if necessary
|
|
|
715 if (is_get) {
|
|
|
716 bool result_pushed = false;
|
|
|
717 if (field->is_constant()) {
|
|
|
718 SharkConstant *sc = SharkConstant::for_field(iter());
|
|
|
719 if (sc->is_loaded()) {
|
|
|
720 push(sc->is_nonzero());
|
|
|
721 result_pushed = true;
|
|
|
722 }
|
|
|
723 }
|
|
|
724
|
|
|
725 if (!result_pushed)
|
|
|
726 push(false);
|
|
|
727
|
|
|
728 if (field->type()->is_two_word())
|
|
|
729 push(false);
|
|
|
730 }
|
|
|
731
|
|
|
732 return true;
|
|
|
733 }
|
|
|
734
|
|
|
735 bool SharkInliner::attempt_inline(ciMethod *target, SharkState *state) {
|
|
|
736 if (SharkIntrinsics::is_intrinsic(target)) {
|
|
|
737 SharkIntrinsics::inline_intrinsic(target, state);
|
|
|
738 return true;
|
|
|
739 }
|
|
|
740
|
|
|
741 if (may_be_inlinable(target)) {
|
|
|
742 SharkInlinerHelper inliner(target, state);
|
|
|
743 if (inliner.is_inlinable()) {
|
|
|
744 inliner.do_inline();
|
|
|
745 return true;
|
|
|
746 }
|
|
|
747 }
|
|
|
748 return false;
|
|
|
749 }
|
