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1 /* |
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2 * Copyright 1997-2007 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 methodOop represents a Java method. |
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26 // |
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27 // Memory layout (each line represents a word). Note that most applications load thousands of methods, |
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28 // so keeping the size of this structure small has a big impact on footprint. |
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29 // |
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30 // We put all oops and method_size first for better gc cache locality. |
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31 // |
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32 // The actual bytecodes are inlined after the end of the methodOopDesc struct. |
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33 // |
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34 // There are bits in the access_flags telling whether inlined tables are present. |
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35 // Note that accessing the line number and local variable tables is not performance critical at all. |
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36 // Accessing the checked exceptions table is used by reflection, so we put that last to make access |
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37 // to it fast. |
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38 // |
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39 // The line number table is compressed and inlined following the byte codes. It is found as the first |
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40 // byte following the byte codes. The checked exceptions table and the local variable table are inlined |
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41 // after the line number table, and indexed from the end of the method. We do not compress the checked |
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42 // exceptions table since the average length is less than 2, and do not bother to compress the local |
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43 // variable table either since it is mostly absent. |
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44 // |
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45 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter) |
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46 // |
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47 // |------------------------------------------------------| |
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48 // | header | |
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49 // | klass | |
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50 // |------------------------------------------------------| |
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51 // | constMethodOop (oop) | |
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52 // | constants (oop) | |
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53 // |------------------------------------------------------| |
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54 // | methodData (oop) | |
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55 // | interp_invocation_count | |
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56 // |------------------------------------------------------| |
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57 // | access_flags | |
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58 // | vtable_index | |
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59 // |------------------------------------------------------| |
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60 // | result_index (C++ interpreter only) | |
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61 // |------------------------------------------------------| |
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62 // | method_size | max_stack | |
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63 // | max_locals | size_of_parameters | |
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64 // |------------------------------------------------------| |
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65 // | intrinsic_id, highest_tier | (unused) | |
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66 // |------------------------------------------------------| |
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67 // | throwout_count | num_breakpoints | |
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68 // |------------------------------------------------------| |
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69 // | invocation_counter | |
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70 // | backedge_counter | |
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71 // |------------------------------------------------------| |
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72 // | code (pointer) | |
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73 // | i2i (pointer) | |
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74 // | adapter (pointer) | |
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75 // | from_compiled_entry (pointer) | |
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76 // | from_interpreted_entry (pointer) | |
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77 // |------------------------------------------------------| |
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78 // | native_function (present only if native) | |
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79 // | signature_handler (present only if native) | |
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80 // |------------------------------------------------------| |
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81 |
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82 |
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83 class CheckedExceptionElement; |
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84 class LocalVariableTableElement; |
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85 class AdapterHandlerEntry; |
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86 |
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87 class methodDataOopDesc; |
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88 |
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89 class methodOopDesc : public oopDesc { |
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90 friend class methodKlass; |
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91 friend class VMStructs; |
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92 private: |
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93 constMethodOop _constMethod; // Method read-only data. |
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94 constantPoolOop _constants; // Constant pool |
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95 methodDataOop _method_data; |
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96 int _interpreter_invocation_count; // Count of times invoked |
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97 AccessFlags _access_flags; // Access flags |
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98 int _vtable_index; // vtable index of this method (see VtableIndexFlag) |
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99 // note: can have vtables with >2**16 elements (because of inheritance) |
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100 #ifdef CC_INTERP |
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101 int _result_index; // C++ interpreter needs for converting results to/from stack |
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102 #endif |
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103 u2 _method_size; // size of this object |
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104 u2 _max_stack; // Maximum number of entries on the expression stack |
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105 u2 _max_locals; // Number of local variables used by this method |
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106 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words |
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107 u1 _intrinsic_id_cache; // Cache for intrinsic_id; 0 or 1+vmInt::ID |
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108 u1 _highest_tier_compile; // Highest compile level this method has ever seen. |
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109 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting |
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110 u2 _number_of_breakpoints; // fullspeed debugging support |
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111 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations |
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112 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations |
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113 #ifndef PRODUCT |
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114 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging) |
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115 #endif |
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116 // Entry point for calling both from and to the interpreter. |
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117 address _i2i_entry; // All-args-on-stack calling convention |
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118 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked. |
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119 AdapterHandlerEntry* _adapter; |
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120 // Entry point for calling from compiled code, to compiled code if it exists |
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121 // or else the interpreter. |
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122 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry() |
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123 // The entry point for calling both from and to compiled code is |
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124 // "_code->entry_point()". Because of tiered compilation and de-opt, this |
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125 // field can come and go. It can transition from NULL to not-null at any |
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126 // time (whenever a compile completes). It can transition from not-null to |
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127 // NULL only at safepoints (because of a de-opt). |
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128 nmethod* volatile _code; // Points to the corresponding piece of native code |
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129 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry |
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130 |
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131 public: |
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132 // accessors for instance variables |
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133 constMethodOop constMethod() const { return _constMethod; } |
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134 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); } |
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135 |
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136 |
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137 static address make_adapters(methodHandle mh, TRAPS); |
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138 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); } |
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139 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); } |
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140 |
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141 // access flag |
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142 AccessFlags access_flags() const { return _access_flags; } |
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143 void set_access_flags(AccessFlags flags) { _access_flags = flags; } |
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144 |
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145 // name |
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146 symbolOop name() const { return _constants->symbol_at(name_index()); } |
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147 int name_index() const { return constMethod()->name_index(); } |
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148 void set_name_index(int index) { constMethod()->set_name_index(index); } |
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149 |
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150 // signature |
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151 symbolOop signature() const { return _constants->symbol_at(signature_index()); } |
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152 int signature_index() const { return constMethod()->signature_index(); } |
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153 void set_signature_index(int index) { constMethod()->set_signature_index(index); } |
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154 |
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155 // generics support |
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156 symbolOop generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); } |
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157 int generic_signature_index() const { return constMethod()->generic_signature_index(); } |
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158 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); } |
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159 |
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160 // annotations support |
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161 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); } |
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162 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); } |
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163 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); } |
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164 |
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165 #ifdef CC_INTERP |
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166 void set_result_index(BasicType type); |
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167 int result_index() { return _result_index; } |
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168 #endif |
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169 |
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170 // Helper routine: get klass name + "." + method name + signature as |
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171 // C string, for the purpose of providing more useful NoSuchMethodErrors |
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172 // and fatal error handling. The string is allocated in resource |
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173 // area if a buffer is not provided by the caller. |
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174 char* name_and_sig_as_C_string(); |
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175 char* name_and_sig_as_C_string(char* buf, int size); |
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176 |
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177 // Static routine in the situations we don't have a methodOop |
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178 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature); |
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179 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size); |
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180 |
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181 // JVMTI breakpoints |
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182 Bytecodes::Code orig_bytecode_at(int bci); |
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183 void set_orig_bytecode_at(int bci, Bytecodes::Code code); |
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184 void set_breakpoint(int bci); |
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185 void clear_breakpoint(int bci); |
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186 void clear_all_breakpoints(); |
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187 // Tracking number of breakpoints, for fullspeed debugging. |
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188 // Only mutated by VM thread. |
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189 u2 number_of_breakpoints() const { return _number_of_breakpoints; } |
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190 void incr_number_of_breakpoints() { ++_number_of_breakpoints; } |
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191 void decr_number_of_breakpoints() { --_number_of_breakpoints; } |
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192 // Initialization only |
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193 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; } |
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194 |
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195 // index into instanceKlass methods() array |
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196 u2 method_idnum() const { return constMethod()->method_idnum(); } |
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197 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); } |
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198 |
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199 // code size |
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200 int code_size() const { return constMethod()->code_size(); } |
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201 |
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202 // method size |
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203 int method_size() const { return _method_size; } |
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204 void set_method_size(int size) { |
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205 assert(0 <= size && size < (1 << 16), "invalid method size"); |
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206 _method_size = size; |
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207 } |
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208 |
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209 // constant pool for klassOop holding this method |
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210 constantPoolOop constants() const { return _constants; } |
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211 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); } |
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212 |
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213 // max stack |
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214 int max_stack() const { return _max_stack; } |
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215 void set_max_stack(int size) { _max_stack = size; } |
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216 |
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217 // max locals |
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218 int max_locals() const { return _max_locals; } |
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219 void set_max_locals(int size) { _max_locals = size; } |
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220 int highest_tier_compile() { return _highest_tier_compile;} |
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221 void set_highest_tier_compile(int level) { _highest_tier_compile = level;} |
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222 |
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223 void clear_intrinsic_id_cache() { _intrinsic_id_cache = 0; } |
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224 |
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225 // Count of times method was exited via exception while interpreting |
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226 void interpreter_throwout_increment() { |
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227 if (_interpreter_throwout_count < 65534) { |
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228 _interpreter_throwout_count++; |
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229 } |
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230 } |
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231 |
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232 int interpreter_throwout_count() const { return _interpreter_throwout_count; } |
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233 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; } |
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234 |
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235 // size of parameters |
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236 int size_of_parameters() const { return _size_of_parameters; } |
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237 |
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238 bool has_stackmap_table() const { |
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239 return constMethod()->has_stackmap_table(); |
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240 } |
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241 |
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242 typeArrayOop stackmap_data() const { |
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243 return constMethod()->stackmap_data(); |
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244 } |
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245 |
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246 // exception handler table |
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247 typeArrayOop exception_table() const |
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248 { return constMethod()->exception_table(); } |
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249 void set_exception_table(typeArrayOop e) |
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250 { constMethod()->set_exception_table(e); } |
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251 bool has_exception_handler() const |
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252 { return constMethod()->has_exception_handler(); } |
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253 |
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254 // Finds the first entry point bci of an exception handler for an |
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255 // exception of klass ex_klass thrown at throw_bci. A value of NULL |
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256 // for ex_klass indicates that the exception klass is not known; in |
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257 // this case it matches any constraint class. Returns -1 if the |
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258 // exception cannot be handled in this method. The handler |
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259 // constraint classes are loaded if necessary. Note that this may |
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260 // throw an exception if loading of the constraint classes causes |
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261 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError. |
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262 // If an exception is thrown, returns the bci of the |
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263 // exception handler which caused the exception to be thrown, which |
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264 // is needed for proper retries. See, for example, |
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265 // InterpreterRuntime::exception_handler_for_exception. |
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266 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS); |
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267 |
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268 // method data access |
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269 methodDataOop method_data() const { |
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270 return _method_data; |
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271 } |
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272 void set_method_data(methodDataOop data) { |
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273 oop_store_without_check((oop*)&_method_data, (oop)data); |
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274 } |
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275 |
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276 // invocation counter |
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277 InvocationCounter* invocation_counter() { return &_invocation_counter; } |
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278 InvocationCounter* backedge_counter() { return &_backedge_counter; } |
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279 int invocation_count() const { return _invocation_counter.count(); } |
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280 int backedge_count() const { return _backedge_counter.count(); } |
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281 bool was_executed_more_than(int n) const; |
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282 bool was_never_executed() const { return !was_executed_more_than(0); } |
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283 |
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284 static void build_interpreter_method_data(methodHandle method, TRAPS); |
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285 |
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286 int interpreter_invocation_count() const { return _interpreter_invocation_count; } |
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287 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; } |
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288 int increment_interpreter_invocation_count() { return ++_interpreter_invocation_count; } |
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289 |
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290 #ifndef PRODUCT |
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291 int compiled_invocation_count() const { return _compiled_invocation_count; } |
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292 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; } |
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293 #endif // not PRODUCT |
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294 |
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295 // Clear (non-shared space) pointers which could not be relevent |
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296 // if this (shared) method were mapped into another JVM. |
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297 void remove_unshareable_info(); |
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298 |
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299 // nmethod/verified compiler entry |
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300 address verified_code_entry(); |
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301 bool check_code() const; // Not inline to avoid circular ref |
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302 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); } |
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303 void clear_code(); // Clear out any compiled code |
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304 void set_code(methodHandle mh, nmethod* code); |
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305 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; } |
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306 address get_i2c_entry(); |
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307 address get_c2i_entry(); |
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308 address get_c2i_unverified_entry(); |
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309 AdapterHandlerEntry* adapter() { return _adapter; } |
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310 // setup entry points |
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311 void link_method(methodHandle method, TRAPS); |
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312 // clear entry points. Used by sharing code |
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313 void unlink_method(); |
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314 |
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315 // vtable index |
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316 enum VtableIndexFlag { |
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317 // Valid vtable indexes are non-negative (>= 0). |
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318 // These few negative values are used as sentinels. |
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319 invalid_vtable_index = -4, // distinct from any valid vtable index |
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320 garbage_vtable_index = -3, // not yet linked; no vtable layout yet |
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321 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch |
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322 // 6330203 Note: Do not use -1, which was overloaded with many meanings. |
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323 }; |
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324 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; }) |
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325 int vtable_index() const { assert(valid_vtable_index(), ""); |
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326 return _vtable_index; } |
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327 void set_vtable_index(int index) { _vtable_index = index; } |
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328 |
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329 // interpreter entry |
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330 address interpreter_entry() const { return _i2i_entry; } |
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331 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry |
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332 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; } |
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333 int interpreter_kind(void) { |
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334 return constMethod()->interpreter_kind(); |
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335 } |
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336 void set_interpreter_kind(); |
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337 void set_interpreter_kind(int kind) { |
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338 constMethod()->set_interpreter_kind(kind); |
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339 } |
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340 |
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341 // native function (used for native methods only) |
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342 enum { |
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343 native_bind_event_is_interesting = true |
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344 }; |
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345 address native_function() const { return *(native_function_addr()); } |
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346 // Must specify a real function (not NULL). |
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347 // Use clear_native_function() to unregister. |
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348 void set_native_function(address function, bool post_event_flag); |
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349 bool has_native_function() const; |
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350 void clear_native_function(); |
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351 |
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352 // signature handler (used for native methods only) |
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353 address signature_handler() const { return *(signature_handler_addr()); } |
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354 void set_signature_handler(address handler); |
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355 |
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356 // Interpreter oopmap support |
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357 void mask_for(int bci, InterpreterOopMap* mask); |
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358 |
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359 #ifndef PRODUCT |
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360 // operations on invocation counter |
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361 void print_invocation_count() const; |
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362 #endif |
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363 |
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364 // byte codes |
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365 address code_base() const { return constMethod()->code_base(); } |
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366 bool contains(address bcp) const { return constMethod()->contains(bcp); } |
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367 |
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368 // prints byte codes |
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369 void print_codes() const { print_codes_on(tty); } |
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370 void print_codes_on(outputStream* st) const PRODUCT_RETURN; |
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371 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN; |
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372 |
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373 // checked exceptions |
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374 int checked_exceptions_length() const |
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375 { return constMethod()->checked_exceptions_length(); } |
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376 CheckedExceptionElement* checked_exceptions_start() const |
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377 { return constMethod()->checked_exceptions_start(); } |
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378 |
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379 // localvariable table |
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380 bool has_localvariable_table() const |
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381 { return constMethod()->has_localvariable_table(); } |
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382 int localvariable_table_length() const |
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383 { return constMethod()->localvariable_table_length(); } |
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384 LocalVariableTableElement* localvariable_table_start() const |
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385 { return constMethod()->localvariable_table_start(); } |
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386 |
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387 bool has_linenumber_table() const |
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388 { return constMethod()->has_linenumber_table(); } |
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389 u_char* compressed_linenumber_table() const |
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390 { return constMethod()->compressed_linenumber_table(); } |
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391 |
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392 // method holder (the klassOop holding this method) |
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393 klassOop method_holder() const { return _constants->pool_holder(); } |
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394 |
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395 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments) |
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396 symbolOop klass_name() const; // returns the name of the method holder |
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397 BasicType result_type() const; // type of the method result |
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398 int result_type_index() const; // type index of the method result |
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399 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); } |
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400 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); } |
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401 |
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402 // Checked exceptions thrown by this method (resolved to mirrors) |
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403 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); } |
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404 |
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405 // Access flags |
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406 bool is_public() const { return access_flags().is_public(); } |
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407 bool is_private() const { return access_flags().is_private(); } |
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408 bool is_protected() const { return access_flags().is_protected(); } |
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409 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } |
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410 bool is_static() const { return access_flags().is_static(); } |
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411 bool is_final() const { return access_flags().is_final(); } |
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412 bool is_synchronized() const { return access_flags().is_synchronized();} |
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413 bool is_native() const { return access_flags().is_native(); } |
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414 bool is_abstract() const { return access_flags().is_abstract(); } |
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415 bool is_strict() const { return access_flags().is_strict(); } |
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416 bool is_synthetic() const { return access_flags().is_synthetic(); } |
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417 |
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418 // returns true if contains only return operation |
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419 bool is_empty_method() const; |
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420 |
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421 // returns true if this is a vanilla constructor |
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422 bool is_vanilla_constructor() const; |
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423 |
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424 // checks method and its method holder |
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425 bool is_final_method() const; |
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426 bool is_strict_method() const; |
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427 |
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428 // true if method needs no dynamic dispatch (final and/or no vtable entry) |
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429 bool can_be_statically_bound() const; |
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430 |
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431 // returns true if the method has any backward branches. |
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432 bool has_loops() { |
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433 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag(); |
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434 }; |
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435 |
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436 bool compute_has_loops_flag(); |
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437 |
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438 bool has_jsrs() { |
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439 return access_flags().has_jsrs(); |
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440 }; |
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441 void set_has_jsrs() { |
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442 _access_flags.set_has_jsrs(); |
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443 } |
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444 |
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445 // returns true if the method has any monitors. |
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446 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); } |
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447 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); } |
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448 |
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449 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); } |
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450 |
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451 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes |
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452 // propererly nest in the method. It might return false, even though they actually nest properly, since the info. |
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453 // has not been computed yet. |
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454 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); } |
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455 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); } |
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456 |
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457 // returns true if the method is an accessor function (setter/getter). |
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458 bool is_accessor() const; |
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459 |
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460 // returns true if the method is an initializer (<init> or <clinit>). |
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461 bool is_initializer() const; |
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462 |
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463 // compiled code support |
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464 // NOTE: code() is inherently racy as deopt can be clearing code |
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465 // simultaneously. Use with caution. |
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466 bool has_compiled_code() const { return code() != NULL; } |
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467 |
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468 // sizing |
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469 static int object_size(bool is_native); |
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470 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; } |
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471 int object_size() const { return method_size(); } |
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472 |
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473 bool object_is_parsable() const { return method_size() > 0; } |
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474 |
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475 // interpreter support |
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476 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); } |
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477 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); } |
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478 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); } |
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479 #ifdef CC_INTERP |
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480 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); } |
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481 #endif /* CC_INTERP */ |
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482 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); } |
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483 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); } |
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484 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); } |
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485 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); } |
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486 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); } |
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487 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); } |
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488 static ByteSize method_data_offset() { |
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489 return byte_offset_of(methodOopDesc, _method_data); |
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490 } |
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491 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); } |
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492 #ifndef PRODUCT |
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493 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); } |
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494 #endif // not PRODUCT |
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495 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); } |
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496 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); } |
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497 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); } |
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498 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); } |
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499 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); } |
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500 |
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501 // for code generation |
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502 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); } |
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503 static int interpreter_invocation_counter_offset_in_bytes() |
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504 { return offset_of(methodOopDesc, _interpreter_invocation_count); } |
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505 |
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506 // Static methods that are used to implement member methods where an exposed this pointer |
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507 // is needed due to possible GCs |
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508 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS); |
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509 |
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510 // Returns the byte code index from the byte code pointer |
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511 int bci_from(address bcp) const; |
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512 address bcp_from(int bci) const; |
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513 int validate_bci_from_bcx(intptr_t bcx) const; |
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514 |
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515 // Returns the line number for a bci if debugging information for the method is prowided, |
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516 // -1 is returned otherwise. |
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517 int line_number_from_bci(int bci) const; |
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518 |
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519 // Reflection support |
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520 bool is_overridden_in(klassOop k) const; |
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521 |
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522 // RedefineClasses() support: |
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523 bool is_old() const { return access_flags().is_old(); } |
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524 void set_is_old() { _access_flags.set_is_old(); } |
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525 bool is_obsolete() const { return access_flags().is_obsolete(); } |
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526 void set_is_obsolete() { _access_flags.set_is_obsolete(); } |
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527 |
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528 // JVMTI Native method prefixing support: |
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529 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); } |
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530 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); } |
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531 |
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532 // Rewriting support |
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533 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, |
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534 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS); |
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535 |
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536 // Get this method's jmethodID -- allocate if it doesn't exist |
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537 jmethodID jmethod_id() { methodHandle this_h(this); |
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538 return instanceKlass::jmethod_id_for_impl(method_holder(), this_h); } |
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539 |
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540 // Lookup the jmethodID for this method. Return NULL if not found. |
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541 // NOTE that this function can be called from a signal handler |
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542 // (see AsyncGetCallTrace support for Forte Analyzer) and this |
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543 // needs to be async-safe. No allocation should be done and |
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544 // so handles are not used to avoid deadlock. |
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545 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); } |
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546 |
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547 // JNI static invoke cached itable index accessors |
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548 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); } |
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549 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); } |
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550 |
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551 // Support for inlining of intrinsic methods |
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552 vmIntrinsics::ID intrinsic_id() const { // returns zero if not an intrinsic |
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553 const u1& cache = _intrinsic_id_cache; |
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554 if (cache != 0) { |
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555 return (vmIntrinsics::ID)(cache - 1); |
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556 } else { |
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557 vmIntrinsics::ID id = compute_intrinsic_id(); |
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558 *(u1*)&cache = ((u1) id) + 1; // force the cache to be non-const |
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559 vmIntrinsics::verify_method(id, (methodOop) this); |
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560 assert((vmIntrinsics::ID)(cache - 1) == id, "proper conversion"); |
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561 return id; |
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562 } |
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563 } |
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564 |
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565 // On-stack replacement support |
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566 bool has_osr_nmethod() { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci) != NULL; } |
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567 nmethod* lookup_osr_nmethod_for(int bci) { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci); } |
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568 |
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569 // Inline cache support |
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570 void cleanup_inline_caches(); |
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571 |
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572 // Find if klass for method is loaded |
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573 bool is_klass_loaded_by_klass_index(int klass_index) const; |
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574 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const; |
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575 |
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576 // Indicates whether compilation failed earlier for this method, or |
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577 // whether it is not compilable for another reason like having a |
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578 // breakpoint set in it. |
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579 bool is_not_compilable(int comp_level = CompLevel_highest_tier) const; |
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580 void set_not_compilable(int comp_level = CompLevel_highest_tier); |
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581 |
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582 bool is_not_osr_compilable() const { return is_not_compilable() || access_flags().is_not_osr_compilable(); } |
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583 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); } |
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584 |
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585 bool is_not_tier1_compilable() const { return access_flags().is_not_tier1_compilable(); } |
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586 void set_not_tier1_compilable() { _access_flags.set_not_tier1_compilable(); } |
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587 |
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588 // Background compilation support |
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589 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); } |
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590 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); } |
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591 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); } |
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592 |
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593 static methodOop method_from_bcp(address bcp); |
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594 |
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595 // Resolve all classes in signature, return 'true' if successful |
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596 static bool load_signature_classes(methodHandle m, TRAPS); |
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597 |
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598 // Return if true if not all classes references in signature, including return type, has been loaded |
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599 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS); |
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600 |
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601 // Printing |
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602 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM |
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603 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)" |
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604 |
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605 // Helper routine used for method sorting |
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606 static void sort_methods(objArrayOop methods, |
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607 objArrayOop methods_annotations, |
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608 objArrayOop methods_parameter_annotations, |
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609 objArrayOop methods_default_annotations, |
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610 bool idempotent = false); |
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611 |
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612 // size of parameters |
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613 void set_size_of_parameters(int size) { _size_of_parameters = size; } |
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614 private: |
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615 |
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616 // Helper routine for intrinsic_id(). |
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617 vmIntrinsics::ID compute_intrinsic_id() const; |
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618 |
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619 // Inlined elements |
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620 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); } |
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621 address* signature_handler_addr() const { return native_function_addr() + 1; } |
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622 |
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623 // Garbage collection support |
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624 oop* adr_constMethod() const { return (oop*)&_constMethod; } |
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625 oop* adr_constants() const { return (oop*)&_constants; } |
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626 oop* adr_method_data() const { return (oop*)&_method_data; } |
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627 }; |
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628 |
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629 |
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630 // Utility class for compressing line number tables |
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631 |
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632 class CompressedLineNumberWriteStream: public CompressedWriteStream { |
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633 private: |
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634 int _bci; |
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635 int _line; |
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636 public: |
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637 // Constructor |
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638 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {} |
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639 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {} |
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640 |
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641 // Write (bci, line number) pair to stream |
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642 void write_pair_regular(int bci_delta, int line_delta); |
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643 |
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644 inline void write_pair_inline(int bci, int line) { |
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645 int bci_delta = bci - _bci; |
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646 int line_delta = line - _line; |
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647 _bci = bci; |
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648 _line = line; |
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649 // Skip (0,0) deltas - they do not add information and conflict with terminator. |
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650 if (bci_delta == 0 && line_delta == 0) return; |
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651 // Check if bci is 5-bit and line number 3-bit unsigned. |
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652 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) { |
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653 // Compress into single byte. |
|
654 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta; |
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655 // Check that value doesn't match escape character. |
|
656 if (value != 0xFF) { |
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657 write_byte(value); |
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658 return; |
|
659 } |
|
660 } |
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661 write_pair_regular(bci_delta, line_delta); |
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662 } |
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663 |
|
664 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair. |
|
665 // Disabling optimization doesn't work for methods in header files |
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666 // so we force it to call through the non-optimized version in the .cpp. |
|
667 // It's gross, but it's the only way we can ensure that all callers are |
|
668 // fixed. MSC_VER is defined in build/windows/makefiles/compile.make. |
|
669 #if defined(_M_AMD64) && MSC_VER >= 1400 |
|
670 void write_pair(int bci, int line); |
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671 #else |
|
672 void write_pair(int bci, int line) { write_pair_inline(bci, line); } |
|
673 #endif |
|
674 |
|
675 // Write end-of-stream marker |
|
676 void write_terminator() { write_byte(0); } |
|
677 }; |
|
678 |
|
679 |
|
680 // Utility class for decompressing line number tables |
|
681 |
|
682 class CompressedLineNumberReadStream: public CompressedReadStream { |
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683 private: |
|
684 int _bci; |
|
685 int _line; |
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686 public: |
|
687 // Constructor |
|
688 CompressedLineNumberReadStream(u_char* buffer); |
|
689 // Read (bci, line number) pair from stream. Returns false at end-of-stream. |
|
690 bool read_pair(); |
|
691 // Accessing bci and line number (after calling read_pair) |
|
692 int bci() const { return _bci; } |
|
693 int line() const { return _line; } |
|
694 }; |
|
695 |
|
696 |
|
697 /// Fast Breakpoints. |
|
698 |
|
699 // If this structure gets more complicated (because bpts get numerous), |
|
700 // move it into its own header. |
|
701 |
|
702 // There is presently no provision for concurrent access |
|
703 // to breakpoint lists, which is only OK for JVMTI because |
|
704 // breakpoints are written only at safepoints, and are read |
|
705 // concurrently only outside of safepoints. |
|
706 |
|
707 class BreakpointInfo : public CHeapObj { |
|
708 friend class VMStructs; |
|
709 private: |
|
710 Bytecodes::Code _orig_bytecode; |
|
711 int _bci; |
|
712 u2 _name_index; // of method |
|
713 u2 _signature_index; // of method |
|
714 BreakpointInfo* _next; // simple storage allocation |
|
715 |
|
716 public: |
|
717 BreakpointInfo(methodOop m, int bci); |
|
718 |
|
719 // accessors |
|
720 Bytecodes::Code orig_bytecode() { return _orig_bytecode; } |
|
721 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; } |
|
722 int bci() { return _bci; } |
|
723 |
|
724 BreakpointInfo* next() const { return _next; } |
|
725 void set_next(BreakpointInfo* n) { _next = n; } |
|
726 |
|
727 // helps for searchers |
|
728 bool match(methodOop m, int bci) { |
|
729 return bci == _bci && match(m); |
|
730 } |
|
731 |
|
732 bool match(methodOop m) { |
|
733 return _name_index == m->name_index() && |
|
734 _signature_index == m->signature_index(); |
|
735 } |
|
736 |
|
737 void set(methodOop method); |
|
738 void clear(methodOop method); |
|
739 }; |