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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 2008, 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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1972
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26 #ifndef SHARE_VM_SHARK_SHARKVALUE_HPP
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27 #define SHARE_VM_SHARK_SHARKVALUE_HPP
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28
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29 #include "ci/ciType.hpp"
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30 #include "memory/allocation.hpp"
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31 #include "shark/llvmHeaders.hpp"
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32 #include "shark/llvmValue.hpp"
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33 #include "shark/sharkType.hpp"
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34
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1692
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35 // Items on the stack and in local variables are tracked using
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36 // SharkValue objects.
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37 //
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38 // All SharkValues are one of two core types, SharkNormalValue
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39 // and SharkAddressValue, but no code outside this file should
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40 // ever refer to those directly. The split is because of the
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41 // way JSRs are handled: the typeflow pass expands them into
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42 // multiple copies, so the return addresses pushed by jsr and
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43 // popped by ret only exist at compile time. Having separate
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44 // classes for these allows us to check that our jsr handling
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45 // is correct, via assertions.
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46 //
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47 // There is one more type, SharkPHIValue, which is a subclass
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48 // of SharkNormalValue with a couple of extra methods. Use of
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49 // SharkPHIValue outside of this file is acceptable, so long
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50 // as it is obtained via SharkValue::as_phi().
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51
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52 class SharkBuilder;
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53 class SharkPHIValue;
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54
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55 class SharkValue : public ResourceObj {
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56 protected:
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57 SharkValue() {}
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58
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59 // Cloning
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60 public:
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61 virtual SharkValue* clone() const = 0;
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62
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63 // Casting
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64 public:
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65 virtual bool is_phi() const;
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66 virtual SharkPHIValue* as_phi();
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67
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68 // Comparison
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69 public:
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70 virtual bool equal_to(SharkValue* other) const = 0;
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71
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72 // Type access
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73 public:
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74 virtual BasicType basic_type() const = 0;
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75 virtual ciType* type() const;
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76
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77 virtual bool is_jint() const;
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78 virtual bool is_jlong() const;
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79 virtual bool is_jfloat() const;
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80 virtual bool is_jdouble() const;
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81 virtual bool is_jobject() const;
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82 virtual bool is_jarray() const;
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83 virtual bool is_address() const;
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84
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85 virtual int size() const = 0;
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86
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87 bool is_one_word() const {
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88 return size() == 1;
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89 }
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90 bool is_two_word() const {
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91 return size() == 2;
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92 }
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93
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94 // Typed conversion from SharkValues
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95 public:
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96 virtual llvm::Value* jint_value() const;
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97 virtual llvm::Value* jlong_value() const;
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98 virtual llvm::Value* jfloat_value() const;
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99 virtual llvm::Value* jdouble_value() const;
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100 virtual llvm::Value* jobject_value() const;
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101 virtual llvm::Value* jarray_value() const;
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102 virtual int address_value() const;
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103
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104 // Typed conversion to SharkValues
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105 public:
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106 static SharkValue* create_jint(llvm::Value* value, bool zero_checked) {
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107 assert(value->getType() == SharkType::jint_type(), "should be");
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108 return create_generic(ciType::make(T_INT), value, zero_checked);
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109 }
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110 static SharkValue* create_jlong(llvm::Value* value, bool zero_checked) {
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111 assert(value->getType() == SharkType::jlong_type(), "should be");
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112 return create_generic(ciType::make(T_LONG), value, zero_checked);
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113 }
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114 static SharkValue* create_jfloat(llvm::Value* value) {
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115 assert(value->getType() == SharkType::jfloat_type(), "should be");
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116 return create_generic(ciType::make(T_FLOAT), value, false);
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117 }
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118 static SharkValue* create_jdouble(llvm::Value* value) {
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119 assert(value->getType() == SharkType::jdouble_type(), "should be");
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120 return create_generic(ciType::make(T_DOUBLE), value, false);
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121 }
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122 static SharkValue* create_jobject(llvm::Value* value, bool zero_checked) {
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123 assert(value->getType() == SharkType::oop_type(), "should be");
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124 return create_generic(ciType::make(T_OBJECT), value, zero_checked);
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125 }
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126
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127 // Typed conversion from constants of various types
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128 public:
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129 static SharkValue* jint_constant(jint value) {
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130 return create_jint(LLVMValue::jint_constant(value), value != 0);
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131 }
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132 static SharkValue* jlong_constant(jlong value) {
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133 return create_jlong(LLVMValue::jlong_constant(value), value != 0);
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134 }
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135 static SharkValue* jfloat_constant(jfloat value) {
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136 return create_jfloat(LLVMValue::jfloat_constant(value));
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137 }
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138 static SharkValue* jdouble_constant(jdouble value) {
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139 return create_jdouble(LLVMValue::jdouble_constant(value));
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140 }
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141 static SharkValue* null() {
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142 return create_jobject(LLVMValue::null(), false);
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143 }
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144 static inline SharkValue* address_constant(int bci);
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145
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146 // Type-losing conversions -- use with care!
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147 public:
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148 virtual llvm::Value* generic_value() const = 0;
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149 virtual llvm::Value* intptr_value(SharkBuilder* builder) const;
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150
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151 static inline SharkValue* create_generic(ciType* type,
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152 llvm::Value* value,
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153 bool zero_checked);
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154 static inline SharkValue* create_phi(ciType* type,
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155 llvm::PHINode* phi,
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156 const SharkPHIValue* parent = NULL);
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157
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158 // Phi-style stuff
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159 public:
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160 virtual void addIncoming(SharkValue* value, llvm::BasicBlock* block);
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161 virtual SharkValue* merge(SharkBuilder* builder,
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162 SharkValue* other,
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163 llvm::BasicBlock* other_block,
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164 llvm::BasicBlock* this_block,
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165 const char* name) = 0;
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166
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167 // Repeated null and divide-by-zero check removal
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168 public:
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169 virtual bool zero_checked() const;
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170 virtual void set_zero_checked(bool zero_checked);
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171 };
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172
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173 class SharkNormalValue : public SharkValue {
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174 friend class SharkValue;
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175
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176 protected:
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177 SharkNormalValue(ciType* type, llvm::Value* value, bool zero_checked)
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178 : _type(type), _llvm_value(value), _zero_checked(zero_checked) {}
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179
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180 private:
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181 ciType* _type;
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182 llvm::Value* _llvm_value;
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183 bool _zero_checked;
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184
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185 private:
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186 llvm::Value* llvm_value() const {
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187 return _llvm_value;
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188 }
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189
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190 // Cloning
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191 public:
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192 SharkValue* clone() const;
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193
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194 // Comparison
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195 public:
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196 bool equal_to(SharkValue* other) const;
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197
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198 // Type access
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199 public:
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200 ciType* type() const;
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201 BasicType basic_type() const;
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202 int size() const;
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203
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204 public:
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205 bool is_jint() const;
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206 bool is_jlong() const;
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207 bool is_jfloat() const;
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208 bool is_jdouble() const;
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209 bool is_jobject() const;
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210 bool is_jarray() const;
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211
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212 // Typed conversions to LLVM values
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213 public:
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214 llvm::Value* jint_value() const;
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215 llvm::Value* jlong_value() const;
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216 llvm::Value* jfloat_value() const;
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217 llvm::Value* jdouble_value() const;
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218 llvm::Value* jobject_value() const;
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219 llvm::Value* jarray_value() const;
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220
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221 // Type-losing conversions, use with care
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222 public:
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223 llvm::Value* generic_value() const;
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224 llvm::Value* intptr_value(SharkBuilder* builder) const;
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225
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226 // Phi-style stuff
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227 public:
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228 SharkValue* merge(SharkBuilder* builder,
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229 SharkValue* other,
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230 llvm::BasicBlock* other_block,
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231 llvm::BasicBlock* this_block,
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232 const char* name);
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233
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234 // Repeated null and divide-by-zero check removal
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235 public:
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236 bool zero_checked() const;
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237 void set_zero_checked(bool zero_checked);
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238 };
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239
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240 class SharkPHIValue : public SharkNormalValue {
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241 friend class SharkValue;
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242
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243 protected:
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244 SharkPHIValue(ciType* type, llvm::PHINode* phi, const SharkPHIValue *parent)
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245 : SharkNormalValue(type, phi, parent && parent->zero_checked()),
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246 _parent(parent),
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247 _all_incomers_zero_checked(true) {}
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248
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249 private:
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250 const SharkPHIValue* _parent;
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251 bool _all_incomers_zero_checked;
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252
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253 private:
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254 const SharkPHIValue* parent() const {
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255 return _parent;
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256 }
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257 bool is_clone() const {
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258 return parent() != NULL;
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259 }
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260
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261 public:
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262 bool all_incomers_zero_checked() const {
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263 if (is_clone())
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264 return parent()->all_incomers_zero_checked();
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265
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266 return _all_incomers_zero_checked;
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267 }
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268
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269 // Cloning
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270 public:
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271 SharkValue* clone() const;
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272
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273 // Casting
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274 public:
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275 bool is_phi() const;
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276 SharkPHIValue* as_phi();
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277
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278 // Phi-style stuff
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279 public:
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280 void addIncoming(SharkValue *value, llvm::BasicBlock* block);
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281 };
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282
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283 class SharkAddressValue : public SharkValue {
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284 friend class SharkValue;
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285
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286 protected:
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287 SharkAddressValue(int bci)
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288 : _bci(bci) {}
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289
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290 private:
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291 int _bci;
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292
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293 // Cloning
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294 public:
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295 SharkValue* clone() const;
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296
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297 // Comparison
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298 public:
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299 bool equal_to(SharkValue* other) const;
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300
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301 // Type access
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302 public:
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303 BasicType basic_type() const;
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304 int size() const;
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305 bool is_address() const;
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306
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307 // Typed conversion from SharkValues
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308 public:
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309 int address_value() const;
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310
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311 // Type-losing conversion -- use with care!
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312 public:
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313 llvm::Value* generic_value() const;
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314
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315 // Phi-style stuff
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316 public:
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317 void addIncoming(SharkValue *value, llvm::BasicBlock* block);
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318 SharkValue* merge(SharkBuilder* builder,
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319 SharkValue* other,
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320 llvm::BasicBlock* other_block,
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321 llvm::BasicBlock* this_block,
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322 const char* name);
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323 };
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324
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325 // SharkValue methods that can't be declared above
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326
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327 inline SharkValue* SharkValue::create_generic(ciType* type,
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328 llvm::Value* value,
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329 bool zero_checked) {
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330 return new SharkNormalValue(type, value, zero_checked);
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331 }
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332
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333 inline SharkValue* SharkValue::create_phi(ciType* type,
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334 llvm::PHINode* phi,
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335 const SharkPHIValue* parent) {
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336 return new SharkPHIValue(type, phi, parent);
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337 }
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338
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339 inline SharkValue* SharkValue::address_constant(int bci) {
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340 return new SharkAddressValue(bci);
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341 }
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1972
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342
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343 #endif // SHARE_VM_SHARK_SHARKVALUE_HPP
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