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1 /* |
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2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 * |
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23 */ |
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24 |
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25 // A StackMapFrame represents one frame in the stack map attribute. |
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26 |
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27 enum { |
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28 FLAG_THIS_UNINIT = 0x01 |
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29 }; |
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30 |
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31 class StackMapFrame : public ResourceObj { |
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32 private: |
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33 int32_t _offset; |
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34 |
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35 // See comment in StackMapTable about _frame_count about why these |
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36 // fields are int32_t instead of u2. |
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37 int32_t _locals_size; // number of valid type elements in _locals |
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38 int32_t _stack_size; // number of valid type elements in _stack |
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39 |
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40 int32_t _max_locals; |
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41 int32_t _max_stack; |
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42 |
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43 u1 _flags; |
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44 VerificationType* _locals; // local variable type array |
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45 VerificationType* _stack; // operand stack type array |
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46 |
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47 ClassVerifier* _verifier; // the verifier verifying this method |
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48 |
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49 public: |
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50 // constructors |
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51 |
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52 // This constructor is used by the type checker to allocate frames |
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53 // in type state, which have _max_locals and _max_stack array elements |
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54 // in _locals and _stack. |
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55 StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* verifier); |
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56 |
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57 // This constructor is used to initialize stackmap frames in stackmap table, |
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58 // which have _locals_size and _stack_size array elements in _locals and _stack. |
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59 StackMapFrame(int32_t offset, |
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60 u1 flags, |
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61 u2 locals_size, |
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62 u2 stack_size, |
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63 u2 max_locals, |
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64 u2 max_stack, |
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65 VerificationType* locals, |
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66 VerificationType* stack, |
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67 ClassVerifier* v) : _offset(offset), _flags(flags), |
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68 _locals_size(locals_size), |
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69 _stack_size(stack_size), |
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70 _max_locals(max_locals), |
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71 _max_stack(max_stack), |
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72 _locals(locals), _stack(stack), |
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73 _verifier(v) { } |
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74 |
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75 inline void set_offset(int32_t offset) { _offset = offset; } |
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76 inline void set_verifier(ClassVerifier* v) { _verifier = v; } |
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77 inline void set_flags(u1 flags) { _flags = flags; } |
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78 inline void set_locals_size(u2 locals_size) { _locals_size = locals_size; } |
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79 inline void set_stack_size(u2 stack_size) { _stack_size = stack_size; } |
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80 inline void clear_stack() { _stack_size = 0; } |
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81 inline int32_t offset() const { return _offset; } |
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82 inline ClassVerifier* verifier() const { return _verifier; } |
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83 inline u1 flags() const { return _flags; } |
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84 inline int32_t locals_size() const { return _locals_size; } |
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85 inline VerificationType* locals() const { return _locals; } |
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86 inline int32_t stack_size() const { return _stack_size; } |
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87 inline VerificationType* stack() const { return _stack; } |
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88 inline int32_t max_locals() const { return _max_locals; } |
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89 inline int32_t max_stack() const { return _max_stack; } |
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90 inline bool flag_this_uninit() const { return _flags & FLAG_THIS_UNINIT; } |
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91 |
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92 // Set locals and stack types to bogus |
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93 inline void reset() { |
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94 int32_t i; |
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95 for (i = 0; i < _max_locals; i++) { |
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96 _locals[i] = VerificationType::bogus_type(); |
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97 } |
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98 for (i = 0; i < _max_stack; i++) { |
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99 _stack[i] = VerificationType::bogus_type(); |
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100 } |
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101 } |
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102 |
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103 // Return a StackMapFrame with the same local variable array and empty stack. |
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104 // Stack array is allocate with unused one element. |
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105 StackMapFrame* frame_in_exception_handler(u1 flags); |
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106 |
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107 // Set local variable type array based on m's signature. |
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108 VerificationType set_locals_from_arg( |
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109 const methodHandle m, VerificationType thisKlass, TRAPS); |
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110 |
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111 // Search local variable type array and stack type array. |
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112 // Return true if an uninitialized object is found. |
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113 bool has_new_object() const; |
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114 |
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115 // Search local variable type array and stack type array. |
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116 // Set every element with type of old_object to new_object. |
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117 void initialize_object( |
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118 VerificationType old_object, VerificationType new_object); |
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119 |
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120 // Copy local variable type array in src into this local variable type array. |
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121 void copy_locals(const StackMapFrame* src); |
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122 |
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123 // Copy stack type array in src into this stack type array. |
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124 void copy_stack(const StackMapFrame* src); |
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125 |
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126 // Return true if this stack map frame is assignable to target. |
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127 bool is_assignable_to(const StackMapFrame* target, TRAPS) const; |
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128 |
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129 // Push type into stack type array. |
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130 inline void push_stack(VerificationType type, TRAPS) { |
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131 assert(!type.is_check(), "Must be a real type"); |
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132 if (_stack_size >= _max_stack) { |
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133 verifier()->verify_error(_offset, "Operand stack overflow"); |
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134 return; |
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135 } |
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136 _stack[_stack_size++] = type; |
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137 } |
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138 |
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139 inline void push_stack_2( |
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140 VerificationType type1, VerificationType type2, TRAPS) { |
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141 assert(type1.is_long() || type1.is_double(), "must be long/double"); |
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142 assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); |
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143 if (_stack_size >= _max_stack - 1) { |
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144 verifier()->verify_error(_offset, "Operand stack overflow"); |
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145 return; |
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146 } |
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147 _stack[_stack_size++] = type1; |
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148 _stack[_stack_size++] = type2; |
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149 } |
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150 |
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151 // Pop and return the top type on stack without verifying. |
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152 inline VerificationType pop_stack(TRAPS) { |
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153 if (_stack_size <= 0) { |
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154 verifier()->verify_error(_offset, "Operand stack underflow"); |
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155 return VerificationType::bogus_type(); |
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156 } |
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157 // Put bogus type to indicate it's no longer valid. |
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158 // Added to make it consistent with the other pop_stack method. |
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159 VerificationType top = _stack[--_stack_size]; |
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160 NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); ) |
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161 return top; |
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162 } |
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163 |
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164 // Pop and return the top type on stack type array after verifying it |
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165 // is assignable to type. |
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166 inline VerificationType pop_stack(VerificationType type, TRAPS) { |
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167 if (_stack_size != 0) { |
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168 VerificationType top = _stack[_stack_size - 1]; |
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169 bool subtype = type.is_assignable_from( |
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170 top, verifier()->current_class(), |
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171 CHECK_(VerificationType::bogus_type())); |
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172 if (subtype) { |
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173 _stack_size --; |
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174 NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); ) |
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175 return top; |
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176 } |
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177 } |
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178 return pop_stack_ex(type, THREAD); |
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179 } |
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180 |
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181 inline void pop_stack_2( |
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182 VerificationType type1, VerificationType type2, TRAPS) { |
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183 assert(type1.is_long2() || type1.is_double2(), "must be long/double"); |
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184 assert(type2.is_long() || type2.is_double(), "must be long/double_2"); |
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185 if (_stack_size >= 2) { |
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186 VerificationType top1 = _stack[_stack_size - 1]; |
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187 bool subtype1 = type1.is_assignable_from( |
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188 top1, verifier()->current_class(), CHECK); |
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189 VerificationType top2 = _stack[_stack_size - 2]; |
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190 bool subtype2 = type2.is_assignable_from( |
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191 top2, verifier()->current_class(), CHECK); |
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192 if (subtype1 && subtype2) { |
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193 _stack_size -= 2; |
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194 NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); ) |
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195 NOT_PRODUCT( _stack[_stack_size+1] = VerificationType::bogus_type(); ) |
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196 return; |
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197 } |
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198 } |
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199 pop_stack_ex(type1, THREAD); |
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200 pop_stack_ex(type2, THREAD); |
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201 } |
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202 |
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203 // Uncommon case that throws exceptions. |
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204 VerificationType pop_stack_ex(VerificationType type, TRAPS); |
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205 |
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206 // Return the type at index in local variable array after verifying |
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207 // it is assignable to type. |
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208 VerificationType get_local(int32_t index, VerificationType type, TRAPS); |
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209 // For long/double. |
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210 void get_local_2( |
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211 int32_t index, VerificationType type1, VerificationType type2, TRAPS); |
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212 |
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213 // Set element at index in local variable array to type. |
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214 void set_local(int32_t index, VerificationType type, TRAPS); |
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215 // For long/double. |
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216 void set_local_2( |
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217 int32_t index, VerificationType type1, VerificationType type2, TRAPS); |
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218 |
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219 // Private auxiliary method used only in is_assignable_to(StackMapFrame). |
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220 // Returns true if src is assignable to target. |
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221 bool is_assignable_to( |
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222 VerificationType* src, VerificationType* target, int32_t len, TRAPS) const; |
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223 |
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224 // Debugging |
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225 void print() const PRODUCT_RETURN; |
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226 }; |