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1 /* |
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2 * Copyright 2008-2009 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 /* |
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26 * JSR 292 reference implementation: method handles |
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27 */ |
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28 |
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29 #include "incls/_precompiled.incl" |
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30 #include "incls/_methodHandles.cpp.incl" |
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31 |
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32 bool MethodHandles::_enabled = false; // set true after successful native linkage |
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33 |
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34 MethodHandleEntry* MethodHandles::_entries[MethodHandles::_EK_LIMIT] = {NULL}; |
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35 const char* MethodHandles::_entry_names[_EK_LIMIT+1] = { |
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36 "check_mtype", |
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37 "wrong_method_type", // what happens when there is a type mismatch |
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38 "invokestatic", // how a MH emulates invokestatic |
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39 "invokespecial", // ditto for the other invokes... |
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40 "invokevirtual", |
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41 "invokeinterface", |
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42 "bound_ref", // these are for BMH... |
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43 "bound_int", |
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44 "bound_long", |
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45 "bound_ref_direct", // (direct versions have a direct methodOop) |
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46 "bound_int_direct", |
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47 "bound_long_direct", |
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48 |
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49 // starting at _adapter_mh_first: |
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50 "adapter_retype_only", // these are for AMH... |
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51 "adapter_check_cast", |
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52 "adapter_prim_to_prim", |
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53 "adapter_ref_to_prim", |
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54 "adapter_prim_to_ref", |
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55 "adapter_swap_args", |
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56 "adapter_rot_args", |
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57 "adapter_dup_args", |
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58 "adapter_drop_args", |
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59 "adapter_collect_args", |
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60 "adapter_spread_args", |
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61 "adapter_flyby", |
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62 "adapter_ricochet", |
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63 |
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64 // optimized adapter types: |
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65 "adapter_swap_args/1", |
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66 "adapter_swap_args/2", |
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67 "adapter_rot_args/1,up", |
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68 "adapter_rot_args/1,down", |
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69 "adapter_rot_args/2,up", |
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70 "adapter_rot_args/2,down", |
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71 "adapter_prim_to_prim/i2i", |
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72 "adapter_prim_to_prim/l2i", |
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73 "adapter_prim_to_prim/d2f", |
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74 "adapter_prim_to_prim/i2l", |
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75 "adapter_prim_to_prim/f2d", |
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76 "adapter_ref_to_prim/unboxi", |
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77 "adapter_ref_to_prim/unboxl", |
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78 "adapter_spread_args/0", |
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79 "adapter_spread_args/1", |
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80 "adapter_spread_args/more", |
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81 |
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82 NULL |
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83 }; |
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84 |
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85 #ifdef ASSERT |
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86 bool MethodHandles::spot_check_entry_names() { |
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87 assert(!strcmp(entry_name(_invokestatic_mh), "invokestatic"), ""); |
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88 assert(!strcmp(entry_name(_bound_ref_mh), "bound_ref"), ""); |
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89 assert(!strcmp(entry_name(_adapter_retype_only), "adapter_retype_only"), ""); |
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90 assert(!strcmp(entry_name(_adapter_ricochet), "adapter_ricochet"), ""); |
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91 assert(!strcmp(entry_name(_adapter_opt_unboxi), "adapter_ref_to_prim/unboxi"), ""); |
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92 return true; |
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93 } |
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94 #endif |
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95 |
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96 void MethodHandles::set_enabled(bool z) { |
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97 if (_enabled != z) { |
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98 guarantee(z && EnableMethodHandles, "can only enable once, and only if -XX:+EnableMethodHandles"); |
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99 _enabled = z; |
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100 } |
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101 } |
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102 |
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103 // Note: A method which does not have a TRAPS argument cannot block in the GC |
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104 // or throw exceptions. Such methods are used in this file to do something quick |
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105 // and local, like parse a data structure. For speed, such methods work on plain |
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106 // oops, not handles. Trapping methods uniformly operate on handles. |
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107 |
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108 methodOop MethodHandles::decode_vmtarget(oop vmtarget, int vmindex, oop mtype, |
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109 klassOop& receiver_limit_result, int& decode_flags_result) { |
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110 if (vmtarget == NULL) return NULL; |
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111 assert(methodOopDesc::nonvirtual_vtable_index < 0, "encoding"); |
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112 if (vmindex < 0) { |
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113 // this DMH performs no dispatch; it is directly bound to a methodOop |
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114 // A MemberName may either be directly bound to a methodOop, |
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115 // or it may use the klass/index form; both forms mean the same thing. |
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116 methodOop m = decode_methodOop(methodOop(vmtarget), decode_flags_result); |
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117 if ((decode_flags_result & _dmf_has_receiver) != 0 |
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118 && java_dyn_MethodType::is_instance(mtype)) { |
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119 // Extract receiver type restriction from mtype.ptypes[0]. |
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120 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype); |
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121 oop ptype0 = (ptypes == NULL || ptypes->length() < 1) ? oop(NULL) : ptypes->obj_at(0); |
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122 if (java_lang_Class::is_instance(ptype0)) |
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123 receiver_limit_result = java_lang_Class::as_klassOop(ptype0); |
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124 } |
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125 if (vmindex == methodOopDesc::nonvirtual_vtable_index) { |
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126 // this DMH can be an "invokespecial" version |
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127 decode_flags_result &= ~_dmf_does_dispatch; |
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128 } else { |
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129 assert(vmindex == methodOopDesc::invalid_vtable_index, "random vmindex?"); |
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130 } |
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131 return m; |
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132 } else { |
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133 decode_flags_result |= MethodHandles::_dmf_does_dispatch; |
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134 assert(vmtarget->is_klass(), "must be class or interface"); |
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135 receiver_limit_result = (klassOop)vmtarget; |
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136 Klass* tk = Klass::cast((klassOop)vmtarget); |
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137 if (tk->is_interface()) { |
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138 // an itable linkage is <interface, itable index> |
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139 decode_flags_result |= MethodHandles::_dmf_from_interface; |
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140 return klassItable::method_for_itable_index((klassOop)vmtarget, vmindex); |
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141 } else { |
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142 if (!tk->oop_is_instance()) |
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143 tk = instanceKlass::cast(SystemDictionary::object_klass()); |
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144 return ((instanceKlass*)tk)->method_at_vtable(vmindex); |
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145 } |
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146 } |
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147 } |
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148 |
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149 // MemberName and DirectMethodHandle have the same linkage to the JVM internals. |
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150 // (MemberName is the non-operational name used for queries and setup.) |
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151 |
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152 methodOop MethodHandles::decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { |
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153 oop vmtarget = sun_dyn_DirectMethodHandle::vmtarget(mh); |
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154 int vmindex = sun_dyn_DirectMethodHandle::vmindex(mh); |
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155 oop mtype = sun_dyn_DirectMethodHandle::type(mh); |
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156 return decode_vmtarget(vmtarget, vmindex, mtype, receiver_limit_result, decode_flags_result); |
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157 } |
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158 |
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159 methodOop MethodHandles::decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { |
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160 assert(mh->klass() == SystemDictionary::BoundMethodHandle_klass(), ""); |
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161 for (oop bmh = mh;;) { |
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162 // Bound MHs can be stacked to bind several arguments. |
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163 oop target = java_dyn_MethodHandle::vmtarget(bmh); |
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164 if (target == NULL) return NULL; |
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165 decode_flags_result |= MethodHandles::_dmf_binds_argument; |
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166 klassOop tk = target->klass(); |
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167 if (tk == SystemDictionary::BoundMethodHandle_klass()) { |
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168 bmh = target; |
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169 continue; |
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170 } else { |
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171 if (java_dyn_MethodHandle::is_subclass(tk)) { |
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172 //assert(tk == SystemDictionary::DirectMethodHandle_klass(), "end of BMH chain must be DMH"); |
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173 return decode_MethodHandle(target, receiver_limit_result, decode_flags_result); |
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174 } else { |
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175 // Optimized case: binding a receiver to a non-dispatched DMH |
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176 // short-circuits directly to the methodOop. |
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177 assert(target->is_method(), "must be a simple method"); |
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178 methodOop m = (methodOop) target; |
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179 DEBUG_ONLY(int argslot = sun_dyn_BoundMethodHandle::vmargslot(bmh)); |
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180 assert(argslot == m->size_of_parameters() - 1, "must be initial argument (receiver)"); |
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181 decode_flags_result |= MethodHandles::_dmf_binds_method; |
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182 return m; |
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183 } |
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184 } |
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185 } |
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186 } |
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187 |
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188 methodOop MethodHandles::decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { |
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189 assert(mh->klass() == SystemDictionary::AdapterMethodHandle_klass(), ""); |
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190 for (oop amh = mh;;) { |
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191 // Adapter MHs can be stacked to convert several arguments. |
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192 int conv_op = adapter_conversion_op(sun_dyn_AdapterMethodHandle::conversion(amh)); |
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193 decode_flags_result |= (_dmf_adapter_lsb << conv_op) & _DMF_ADAPTER_MASK; |
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194 oop target = java_dyn_MethodHandle::vmtarget(amh); |
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195 if (target == NULL) return NULL; |
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196 klassOop tk = target->klass(); |
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197 if (tk == SystemDictionary::AdapterMethodHandle_klass()) { |
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198 amh = target; |
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199 continue; |
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200 } else { |
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201 // must be a BMH (which will bind some more arguments) or a DMH (for the final call) |
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202 return MethodHandles::decode_MethodHandle(target, receiver_limit_result, decode_flags_result); |
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203 } |
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204 } |
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205 } |
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206 |
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207 methodOop MethodHandles::decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result) { |
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208 if (mh == NULL) return NULL; |
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209 klassOop mhk = mh->klass(); |
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210 assert(java_dyn_MethodHandle::is_subclass(mhk), "must be a MethodHandle"); |
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211 if (mhk == SystemDictionary::DirectMethodHandle_klass()) { |
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212 return decode_DirectMethodHandle(mh, receiver_limit_result, decode_flags_result); |
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213 } else if (mhk == SystemDictionary::BoundMethodHandle_klass()) { |
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214 return decode_BoundMethodHandle(mh, receiver_limit_result, decode_flags_result); |
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215 } else if (mhk == SystemDictionary::AdapterMethodHandle_klass()) { |
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216 return decode_AdapterMethodHandle(mh, receiver_limit_result, decode_flags_result); |
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217 } else { |
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218 assert(false, "cannot parse this MH"); |
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219 return NULL; // random MH? |
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220 } |
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221 } |
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222 |
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223 methodOop MethodHandles::decode_methodOop(methodOop m, int& decode_flags_result) { |
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224 assert(m->is_method(), ""); |
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225 if (m->is_static()) { |
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226 // check that signature begins '(L' or '([' (not '(I', '()', etc.) |
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227 symbolOop sig = m->signature(); |
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228 BasicType recv_bt = char2type(sig->byte_at(1)); |
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229 // Note: recv_bt might be T_ILLEGAL if byte_at(2) is ')' |
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230 assert(sig->byte_at(0) == '(', "must be method sig"); |
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231 if (recv_bt == T_OBJECT || recv_bt == T_ARRAY) |
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232 decode_flags_result |= _dmf_has_receiver; |
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233 } else { |
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234 // non-static method |
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235 decode_flags_result |= _dmf_has_receiver; |
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236 if (!m->can_be_statically_bound() && !m->is_initializer()) { |
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237 decode_flags_result |= _dmf_does_dispatch; |
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238 if (Klass::cast(m->method_holder())->is_interface()) |
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239 decode_flags_result |= _dmf_from_interface; |
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240 } |
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241 } |
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242 return m; |
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243 } |
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244 |
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245 |
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246 // A trusted party is handing us a cookie to determine a method. |
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247 // Let's boil it down to the method oop they really want. |
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248 methodOop MethodHandles::decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result) { |
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249 decode_flags_result = 0; |
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250 receiver_limit_result = NULL; |
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251 klassOop xk = x->klass(); |
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252 if (xk == Universe::methodKlassObj()) { |
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253 return decode_methodOop((methodOop) x, decode_flags_result); |
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254 } else if (xk == SystemDictionary::MemberName_klass()) { |
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255 // Note: This only works if the MemberName has already been resolved. |
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256 return decode_MemberName(x, receiver_limit_result, decode_flags_result); |
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257 } else if (java_dyn_MethodHandle::is_subclass(xk)) { |
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258 return decode_MethodHandle(x, receiver_limit_result, decode_flags_result); |
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259 } else if (xk == SystemDictionary::reflect_method_klass()) { |
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260 oop clazz = java_lang_reflect_Method::clazz(x); |
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261 int slot = java_lang_reflect_Method::slot(x); |
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262 klassOop k = java_lang_Class::as_klassOop(clazz); |
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263 if (k != NULL && Klass::cast(k)->oop_is_instance()) |
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264 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), |
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265 decode_flags_result); |
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266 } else if (xk == SystemDictionary::reflect_constructor_klass()) { |
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267 oop clazz = java_lang_reflect_Constructor::clazz(x); |
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268 int slot = java_lang_reflect_Constructor::slot(x); |
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269 klassOop k = java_lang_Class::as_klassOop(clazz); |
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270 if (k != NULL && Klass::cast(k)->oop_is_instance()) |
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271 return decode_methodOop(instanceKlass::cast(k)->method_with_idnum(slot), |
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272 decode_flags_result); |
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273 } else { |
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274 // unrecognized object |
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275 assert(!x->is_method(), "already checked"); |
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276 assert(!sun_dyn_MemberName::is_instance(x), "already checked"); |
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277 } |
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278 return NULL; |
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279 } |
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280 |
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281 |
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282 int MethodHandles::decode_MethodHandle_stack_pushes(oop mh) { |
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283 if (mh->klass() == SystemDictionary::DirectMethodHandle_klass()) |
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284 return 0; // no push/pop |
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285 int this_vmslots = java_dyn_MethodHandle::vmslots(mh); |
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286 int last_vmslots = 0; |
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287 oop last_mh = mh; |
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288 for (;;) { |
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289 oop target = java_dyn_MethodHandle::vmtarget(last_mh); |
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290 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { |
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291 last_vmslots = java_dyn_MethodHandle::vmslots(target); |
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292 break; |
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293 } else if (!java_dyn_MethodHandle::is_instance(target)) { |
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294 // might be klass or method |
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295 assert(target->is_method(), "must get here with a direct ref to method"); |
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296 last_vmslots = methodOop(target)->size_of_parameters(); |
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297 break; |
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298 } |
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299 last_mh = target; |
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300 } |
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301 // If I am called with fewer VM slots than my ultimate callee, |
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302 // it must be that I push the additionally needed slots. |
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303 // Likewise if am called with more VM slots, I will pop them. |
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304 return (last_vmslots - this_vmslots); |
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305 } |
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306 |
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307 |
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308 // MemberName support |
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309 |
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310 // import sun_dyn_MemberName.* |
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311 enum { |
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312 IS_METHOD = sun_dyn_MemberName::MN_IS_METHOD, |
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313 IS_CONSTRUCTOR = sun_dyn_MemberName::MN_IS_CONSTRUCTOR, |
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314 IS_FIELD = sun_dyn_MemberName::MN_IS_FIELD, |
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315 IS_TYPE = sun_dyn_MemberName::MN_IS_TYPE, |
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316 SEARCH_SUPERCLASSES = sun_dyn_MemberName::MN_SEARCH_SUPERCLASSES, |
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317 SEARCH_INTERFACES = sun_dyn_MemberName::MN_SEARCH_INTERFACES, |
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318 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE, |
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319 VM_INDEX_UNINITIALIZED = sun_dyn_MemberName::VM_INDEX_UNINITIALIZED |
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320 }; |
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321 |
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322 void MethodHandles::init_MemberName(oop mname_oop, oop target_oop) { |
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323 if (target_oop->klass() == SystemDictionary::reflect_field_klass()) { |
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324 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() |
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325 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() |
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326 int mods = java_lang_reflect_Field::modifiers(target_oop); |
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327 klassOop k = java_lang_Class::as_klassOop(clazz); |
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328 int offset = instanceKlass::cast(k)->offset_from_fields(slot); |
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329 init_MemberName(mname_oop, k, accessFlags_from(mods), offset); |
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330 } else { |
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331 int decode_flags = 0; klassOop receiver_limit = NULL; |
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332 methodOop m = MethodHandles::decode_method(target_oop, |
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333 receiver_limit, decode_flags); |
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334 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); |
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335 init_MemberName(mname_oop, m, do_dispatch); |
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336 } |
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337 } |
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338 |
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339 void MethodHandles::init_MemberName(oop mname_oop, methodOop m, bool do_dispatch) { |
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340 int flags = ((m->is_initializer() ? IS_CONSTRUCTOR : IS_METHOD) |
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341 | (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS )); |
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342 oop vmtarget = m; |
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343 int vmindex = methodOopDesc::invalid_vtable_index; // implies no info yet |
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344 if (!do_dispatch || (flags & IS_CONSTRUCTOR) || m->can_be_statically_bound()) |
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345 vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch |
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346 assert(vmindex != VM_INDEX_UNINITIALIZED, "Java sentinel value"); |
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347 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); |
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348 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); |
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349 sun_dyn_MemberName::set_flags(mname_oop, flags); |
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350 } |
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351 |
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352 void MethodHandles::init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset) { |
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353 int flags = (IS_FIELD | (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS )); |
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354 oop vmtarget = field_holder; |
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355 int vmindex = offset; // implies no info yet |
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356 assert(vmindex != VM_INDEX_UNINITIALIZED, "bad alias on vmindex"); |
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357 sun_dyn_MemberName::set_vmtarget(mname_oop, vmtarget); |
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358 sun_dyn_MemberName::set_vmindex(mname_oop, vmindex); |
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359 sun_dyn_MemberName::set_flags(mname_oop, flags); |
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360 } |
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361 |
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362 |
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363 methodOop MethodHandles::decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result) { |
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364 int flags = sun_dyn_MemberName::flags(mname); |
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365 if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) == 0) return NULL; // not invocable |
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366 oop vmtarget = sun_dyn_MemberName::vmtarget(mname); |
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367 int vmindex = sun_dyn_MemberName::vmindex(mname); |
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368 if (vmindex == VM_INDEX_UNINITIALIZED) return NULL; // not resolved |
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369 return decode_vmtarget(vmtarget, vmindex, NULL, receiver_limit_result, decode_flags_result); |
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370 } |
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371 |
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372 // An unresolved member name is a mere symbolic reference. |
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373 // Resolving it plants a vmtarget/vmindex in it, |
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374 // which refers dirctly to JVM internals. |
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375 void MethodHandles::resolve_MemberName(Handle mname, TRAPS) { |
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376 assert(sun_dyn_MemberName::is_instance(mname()), ""); |
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377 #ifdef ASSERT |
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378 // If this assert throws, renegotiate the sentinel value used by the Java code, |
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379 // so that it is distinct from any valid vtable index value, and any special |
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380 // values defined in methodOopDesc::VtableIndexFlag. |
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381 // The point of the slop is to give the Java code and the JVM some room |
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382 // to independently specify sentinel values. |
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383 const int sentinel_slop = 10; |
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384 const int sentinel_limit = methodOopDesc::highest_unused_vtable_index_value - sentinel_slop; |
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385 assert(VM_INDEX_UNINITIALIZED < sentinel_limit, "Java sentinel != JVM sentinels"); |
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386 #endif |
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387 if (sun_dyn_MemberName::vmindex(mname()) != VM_INDEX_UNINITIALIZED) |
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388 return; // already resolved |
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389 oop defc_oop = sun_dyn_MemberName::clazz(mname()); |
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390 oop name_str = sun_dyn_MemberName::name(mname()); |
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391 oop type_str = sun_dyn_MemberName::type(mname()); |
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392 int flags = sun_dyn_MemberName::flags(mname()); |
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393 |
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394 if (defc_oop == NULL || name_str == NULL || type_str == NULL) { |
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395 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve"); |
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396 } |
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397 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop); |
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398 defc_oop = NULL; // safety |
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399 if (defc_klassOop == NULL) return; // a primitive; no resolution possible |
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400 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { |
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401 if (!Klass::cast(defc_klassOop)->oop_is_array()) return; |
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402 defc_klassOop = SystemDictionary::object_klass(); |
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403 } |
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404 instanceKlassHandle defc(THREAD, defc_klassOop); |
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405 defc_klassOop = NULL; // safety |
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406 if (defc.is_null()) { |
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407 THROW_MSG(vmSymbols::java_lang_InternalError(), "primitive class"); |
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408 } |
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409 defc->link_class(CHECK); |
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410 |
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411 // convert the external string name to an internal symbol |
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412 symbolHandle name(THREAD, java_lang_String::as_symbol_or_null(name_str)); |
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413 if (name.is_null()) return; // no such name |
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414 name_str = NULL; // safety |
|
415 |
|
416 // convert the external string or reflective type to an internal signature |
|
417 bool force_signature = (name() == vmSymbols::invoke_name()); |
|
418 symbolHandle type; { |
|
419 symbolOop type_sym = NULL; |
|
420 if (java_dyn_MethodType::is_instance(type_str)) { |
|
421 type_sym = java_dyn_MethodType::as_signature(type_str, force_signature, CHECK); |
|
422 } else if (java_lang_Class::is_instance(type_str)) { |
|
423 type_sym = java_lang_Class::as_signature(type_str, force_signature, CHECK); |
|
424 } else if (java_lang_String::is_instance(type_str)) { |
|
425 if (force_signature) { |
|
426 type = java_lang_String::as_symbol(type_str, CHECK); |
|
427 } else { |
|
428 type_sym = java_lang_String::as_symbol_or_null(type_str); |
|
429 } |
|
430 } else { |
|
431 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized type"); |
|
432 } |
|
433 if (type_sym != NULL) |
|
434 type = symbolHandle(THREAD, type_sym); |
|
435 } |
|
436 if (type.is_null()) return; // no such signature exists in the VM |
|
437 type_str = NULL; // safety |
|
438 |
|
439 // Time to do the lookup. |
|
440 switch (flags & ALL_KINDS) { |
|
441 case IS_METHOD: |
|
442 { |
|
443 CallInfo result; |
|
444 { |
|
445 EXCEPTION_MARK; |
|
446 if ((flags & JVM_ACC_STATIC) != 0) { |
|
447 LinkResolver::resolve_static_call(result, |
|
448 defc, name, type, KlassHandle(), false, false, THREAD); |
|
449 } else if (defc->is_interface()) { |
|
450 LinkResolver::resolve_interface_call(result, Handle(), defc, |
|
451 defc, name, type, KlassHandle(), false, false, THREAD); |
|
452 } else { |
|
453 LinkResolver::resolve_virtual_call(result, Handle(), defc, |
|
454 defc, name, type, KlassHandle(), false, false, THREAD); |
|
455 } |
|
456 if (HAS_PENDING_EXCEPTION) { |
|
457 CLEAR_PENDING_EXCEPTION; |
|
458 return; |
|
459 } |
|
460 } |
|
461 methodHandle m = result.resolved_method(); |
|
462 oop vmtarget = NULL; |
|
463 int vmindex = methodOopDesc::nonvirtual_vtable_index; |
|
464 if (defc->is_interface()) { |
|
465 vmindex = klassItable::compute_itable_index(m()); |
|
466 assert(vmindex >= 0, ""); |
|
467 } else if (result.has_vtable_index()) { |
|
468 vmindex = result.vtable_index(); |
|
469 assert(vmindex >= 0, ""); |
|
470 } |
|
471 assert(vmindex != VM_INDEX_UNINITIALIZED, ""); |
|
472 if (vmindex < 0) { |
|
473 assert(result.is_statically_bound(), ""); |
|
474 vmtarget = m(); |
|
475 } else { |
|
476 vmtarget = result.resolved_klass()->as_klassOop(); |
|
477 } |
|
478 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); |
|
479 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); |
|
480 sun_dyn_MemberName::set_vmindex(mname(), vmindex); |
|
481 sun_dyn_MemberName::set_modifiers(mname(), mods); |
|
482 DEBUG_ONLY(int junk; klassOop junk2); |
|
483 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), |
|
484 "properly stored for later decoding"); |
|
485 return; |
|
486 } |
|
487 case IS_CONSTRUCTOR: |
|
488 { |
|
489 CallInfo result; |
|
490 { |
|
491 EXCEPTION_MARK; |
|
492 if (name() == vmSymbols::object_initializer_name()) { |
|
493 LinkResolver::resolve_special_call(result, |
|
494 defc, name, type, KlassHandle(), false, THREAD); |
|
495 } else { |
|
496 break; // will throw after end of switch |
|
497 } |
|
498 if (HAS_PENDING_EXCEPTION) { |
|
499 CLEAR_PENDING_EXCEPTION; |
|
500 return; |
|
501 } |
|
502 } |
|
503 assert(result.is_statically_bound(), ""); |
|
504 methodHandle m = result.resolved_method(); |
|
505 oop vmtarget = m(); |
|
506 int vmindex = methodOopDesc::nonvirtual_vtable_index; |
|
507 int mods = (m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS); |
|
508 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); |
|
509 sun_dyn_MemberName::set_vmindex(mname(), vmindex); |
|
510 sun_dyn_MemberName::set_modifiers(mname(), mods); |
|
511 DEBUG_ONLY(int junk; klassOop junk2); |
|
512 assert(decode_MemberName(mname(), junk2, junk) == result.resolved_method()(), |
|
513 "properly stored for later decoding"); |
|
514 return; |
|
515 } |
|
516 case IS_FIELD: |
|
517 { |
|
518 // This is taken from LinkResolver::resolve_field, sans access checks. |
|
519 fieldDescriptor fd; // find_field initializes fd if found |
|
520 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name(), type(), &fd)); |
|
521 // check if field exists; i.e., if a klass containing the field def has been selected |
|
522 if (sel_klass.is_null()) return; |
|
523 oop vmtarget = sel_klass->as_klassOop(); |
|
524 int vmindex = fd.offset(); |
|
525 int mods = (fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS); |
|
526 if (vmindex == VM_INDEX_UNINITIALIZED) break; // should not happen |
|
527 sun_dyn_MemberName::set_vmtarget(mname(), vmtarget); |
|
528 sun_dyn_MemberName::set_vmindex(mname(), vmindex); |
|
529 sun_dyn_MemberName::set_modifiers(mname(), mods); |
|
530 return; |
|
531 } |
|
532 } |
|
533 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); |
|
534 } |
|
535 |
|
536 // Conversely, a member name which is only initialized from JVM internals |
|
537 // may have null defc, name, and type fields. |
|
538 // Resolving it plants a vmtarget/vmindex in it, |
|
539 // which refers directly to JVM internals. |
|
540 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { |
|
541 assert(sun_dyn_MemberName::is_instance(mname()), ""); |
|
542 oop vmtarget = sun_dyn_MemberName::vmtarget(mname()); |
|
543 int vmindex = sun_dyn_MemberName::vmindex(mname()); |
|
544 if (vmtarget == NULL || vmindex == VM_INDEX_UNINITIALIZED) { |
|
545 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); |
|
546 } |
|
547 |
|
548 bool have_defc = (sun_dyn_MemberName::clazz(mname()) != NULL); |
|
549 bool have_name = (sun_dyn_MemberName::name(mname()) != NULL); |
|
550 bool have_type = (sun_dyn_MemberName::type(mname()) != NULL); |
|
551 int flags = sun_dyn_MemberName::flags(mname()); |
|
552 |
|
553 if (suppress != 0) { |
|
554 if (suppress & _suppress_defc) have_defc = true; |
|
555 if (suppress & _suppress_name) have_name = true; |
|
556 if (suppress & _suppress_type) have_type = true; |
|
557 } |
|
558 |
|
559 if (have_defc && have_name && have_type) return; // nothing needed |
|
560 |
|
561 switch (flags & ALL_KINDS) { |
|
562 case IS_METHOD: |
|
563 case IS_CONSTRUCTOR: |
|
564 { |
|
565 klassOop receiver_limit = NULL; |
|
566 int decode_flags = 0; |
|
567 methodHandle m(THREAD, decode_vmtarget(vmtarget, vmindex, NULL, |
|
568 receiver_limit, decode_flags)); |
|
569 if (m.is_null()) break; |
|
570 if (!have_defc) { |
|
571 klassOop defc = m->method_holder(); |
|
572 if (receiver_limit != NULL && receiver_limit != defc |
|
573 && Klass::cast(receiver_limit)->is_subtype_of(defc)) |
|
574 defc = receiver_limit; |
|
575 sun_dyn_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); |
|
576 } |
|
577 if (!have_name) { |
|
578 //not java_lang_String::create_from_symbol; let's intern member names |
|
579 Handle name = StringTable::intern(m->name(), CHECK); |
|
580 sun_dyn_MemberName::set_name(mname(), name()); |
|
581 } |
|
582 if (!have_type) { |
|
583 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); |
|
584 sun_dyn_MemberName::set_type(mname(), type()); |
|
585 } |
|
586 return; |
|
587 } |
|
588 case IS_FIELD: |
|
589 { |
|
590 // This is taken from LinkResolver::resolve_field, sans access checks. |
|
591 if (!vmtarget->is_klass()) break; |
|
592 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; |
|
593 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); |
|
594 bool is_static = ((flags & JVM_ACC_STATIC) != 0); |
|
595 fieldDescriptor fd; // find_field initializes fd if found |
|
596 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) |
|
597 break; // cannot expand |
|
598 if (!have_defc) { |
|
599 sun_dyn_MemberName::set_clazz(mname(), defc->java_mirror()); |
|
600 } |
|
601 if (!have_name) { |
|
602 //not java_lang_String::create_from_symbol; let's intern member names |
|
603 Handle name = StringTable::intern(fd.name(), CHECK); |
|
604 sun_dyn_MemberName::set_name(mname(), name()); |
|
605 } |
|
606 if (!have_type) { |
|
607 Handle type = java_lang_String::create_from_symbol(fd.signature(), CHECK); |
|
608 sun_dyn_MemberName::set_type(mname(), type()); |
|
609 } |
|
610 return; |
|
611 } |
|
612 } |
|
613 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); |
|
614 } |
|
615 |
|
616 int MethodHandles::find_MemberNames(klassOop k, |
|
617 symbolOop name, symbolOop sig, |
|
618 int mflags, klassOop caller, |
|
619 int skip, objArrayOop results) { |
|
620 DEBUG_ONLY(No_Safepoint_Verifier nsv); |
|
621 // this code contains no safepoints! |
|
622 |
|
623 // %%% take caller into account! |
|
624 |
|
625 if (k == NULL || !Klass::cast(k)->oop_is_instance()) return -1; |
|
626 |
|
627 int rfill = 0, rlimit = results->length(), rskip = skip; |
|
628 // overflow measurement: |
|
629 int overflow = 0, overflow_limit = MAX2(1000, rlimit); |
|
630 |
|
631 int match_flags = mflags; |
|
632 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); |
|
633 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); |
|
634 bool local_only = !(search_superc | search_intfc); |
|
635 bool classes_only = false; |
|
636 |
|
637 if (name != NULL) { |
|
638 if (name->utf8_length() == 0) return 0; // a match is not possible |
|
639 } |
|
640 if (sig != NULL) { |
|
641 if (sig->utf8_length() == 0) return 0; // a match is not possible |
|
642 if (sig->byte_at(0) == '(') |
|
643 match_flags &= ~(IS_FIELD | IS_TYPE); |
|
644 else |
|
645 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); |
|
646 } |
|
647 |
|
648 if ((match_flags & IS_TYPE) != 0) { |
|
649 // NYI, and Core Reflection works quite well for this query |
|
650 } |
|
651 |
|
652 if ((match_flags & IS_FIELD) != 0) { |
|
653 for (FieldStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { |
|
654 if (name != NULL && st.name() != name) |
|
655 continue; |
|
656 if (sig != NULL && st.signature() != sig) |
|
657 continue; |
|
658 // passed the filters |
|
659 if (rskip > 0) { |
|
660 --rskip; |
|
661 } else if (rfill < rlimit) { |
|
662 oop result = results->obj_at(rfill++); |
|
663 if (!sun_dyn_MemberName::is_instance(result)) |
|
664 return -99; // caller bug! |
|
665 MethodHandles::init_MemberName(result, st.klass()->as_klassOop(), st.access_flags(), st.offset()); |
|
666 } else if (++overflow >= overflow_limit) { |
|
667 match_flags = 0; break; // got tired of looking at overflow |
|
668 } |
|
669 } |
|
670 } |
|
671 |
|
672 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { |
|
673 // watch out for these guys: |
|
674 symbolOop init_name = vmSymbols::object_initializer_name(); |
|
675 symbolOop clinit_name = vmSymbols::class_initializer_name(); |
|
676 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> |
|
677 bool negate_name_test = false; |
|
678 // fix name so that it captures the intention of IS_CONSTRUCTOR |
|
679 if (!(match_flags & IS_METHOD)) { |
|
680 // constructors only |
|
681 if (name == NULL) { |
|
682 name = init_name; |
|
683 } else if (name != init_name) { |
|
684 return 0; // no constructors of this method name |
|
685 } |
|
686 } else if (!(match_flags & IS_CONSTRUCTOR)) { |
|
687 // methods only |
|
688 if (name == NULL) { |
|
689 name = init_name; |
|
690 negate_name_test = true; // if we see the name, we *omit* the entry |
|
691 } else if (name == init_name) { |
|
692 return 0; // no methods of this constructor name |
|
693 } |
|
694 } else { |
|
695 // caller will accept either sort; no need to adjust name |
|
696 } |
|
697 for (MethodStream st(k, local_only, !search_intfc); !st.eos(); st.next()) { |
|
698 methodOop m = st.method(); |
|
699 symbolOop m_name = m->name(); |
|
700 if (m_name == clinit_name) |
|
701 continue; |
|
702 if (name != NULL && ((m_name != name) ^ negate_name_test)) |
|
703 continue; |
|
704 if (sig != NULL && m->signature() != sig) |
|
705 continue; |
|
706 // passed the filters |
|
707 if (rskip > 0) { |
|
708 --rskip; |
|
709 } else if (rfill < rlimit) { |
|
710 oop result = results->obj_at(rfill++); |
|
711 if (!sun_dyn_MemberName::is_instance(result)) |
|
712 return -99; // caller bug! |
|
713 MethodHandles::init_MemberName(result, m, true); |
|
714 } else if (++overflow >= overflow_limit) { |
|
715 match_flags = 0; break; // got tired of looking at overflow |
|
716 } |
|
717 } |
|
718 } |
|
719 |
|
720 // return number of elements we at leasted wanted to initialize |
|
721 return rfill + overflow; |
|
722 } |
|
723 |
|
724 |
|
725 |
|
726 |
|
727 // Decode the vmtarget field of a method handle. |
|
728 // Sanitize out methodOops, klassOops, and any other non-Java data. |
|
729 // This is for debugging and reflection. |
|
730 oop MethodHandles::encode_target(Handle mh, int format, TRAPS) { |
|
731 assert(java_dyn_MethodHandle::is_instance(mh()), "must be a MH"); |
|
732 if (format == ETF_HANDLE_OR_METHOD_NAME) { |
|
733 oop target = java_dyn_MethodHandle::vmtarget(mh()); |
|
734 if (target == NULL) { |
|
735 return NULL; // unformed MH |
|
736 } |
|
737 klassOop tklass = target->klass(); |
|
738 if (Klass::cast(tklass)->is_subclass_of(SystemDictionary::object_klass())) { |
|
739 return target; // target is another MH (or something else?) |
|
740 } |
|
741 } |
|
742 if (format == ETF_DIRECT_HANDLE) { |
|
743 oop target = mh(); |
|
744 for (;;) { |
|
745 if (target->klass() == SystemDictionary::DirectMethodHandle_klass()) { |
|
746 return target; |
|
747 } |
|
748 if (!java_dyn_MethodHandle::is_instance(target)){ |
|
749 return NULL; // unformed MH |
|
750 } |
|
751 target = java_dyn_MethodHandle::vmtarget(target); |
|
752 } |
|
753 } |
|
754 // cases of metadata in MH.vmtarget: |
|
755 // - AMH can have methodOop for static invoke with bound receiver |
|
756 // - DMH can have methodOop for static invoke (on variable receiver) |
|
757 // - DMH can have klassOop for dispatched (non-static) invoke |
|
758 klassOop receiver_limit = NULL; |
|
759 int decode_flags = 0; |
|
760 methodOop m = decode_MethodHandle(mh(), receiver_limit, decode_flags); |
|
761 if (m == NULL) return NULL; |
|
762 switch (format) { |
|
763 case ETF_REFLECT_METHOD: |
|
764 // same as jni_ToReflectedMethod: |
|
765 if (m->is_initializer()) { |
|
766 return Reflection::new_constructor(m, THREAD); |
|
767 } else { |
|
768 return Reflection::new_method(m, UseNewReflection, false, THREAD); |
|
769 } |
|
770 |
|
771 case ETF_HANDLE_OR_METHOD_NAME: // method, not handle |
|
772 case ETF_METHOD_NAME: |
|
773 { |
|
774 if (SystemDictionary::MemberName_klass() == NULL) break; |
|
775 instanceKlassHandle mname_klass(THREAD, SystemDictionary::MemberName_klass()); |
|
776 mname_klass->initialize(CHECK_NULL); |
|
777 Handle mname = mname_klass->allocate_instance_handle(CHECK_NULL); |
|
778 sun_dyn_MemberName::set_vmindex(mname(), VM_INDEX_UNINITIALIZED); |
|
779 bool do_dispatch = ((decode_flags & MethodHandles::_dmf_does_dispatch) != 0); |
|
780 init_MemberName(mname(), m, do_dispatch); |
|
781 expand_MemberName(mname, 0, CHECK_NULL); |
|
782 return mname(); |
|
783 } |
|
784 } |
|
785 |
|
786 // Unknown format code. |
|
787 char msg[50]; |
|
788 jio_snprintf(msg, sizeof(msg), "unknown getTarget format=%d", format); |
|
789 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), msg); |
|
790 } |
|
791 |
|
792 bool MethodHandles::class_cast_needed(klassOop src, klassOop dst) { |
|
793 if (src == dst || dst == SystemDictionary::object_klass()) |
|
794 return false; // quickest checks |
|
795 Klass* srck = Klass::cast(src); |
|
796 Klass* dstk = Klass::cast(dst); |
|
797 if (dstk->is_interface()) { |
|
798 // interface receivers can safely be viewed as untyped, |
|
799 // because interface calls always include a dynamic check |
|
800 //dstk = Klass::cast(SystemDictionary::object_klass()); |
|
801 return false; |
|
802 } |
|
803 if (srck->is_interface()) { |
|
804 // interface arguments must be viewed as untyped |
|
805 //srck = Klass::cast(SystemDictionary::object_klass()); |
|
806 return true; |
|
807 } |
|
808 return !srck->is_subclass_of(dstk->as_klassOop()); |
|
809 } |
|
810 |
|
811 static oop object_java_mirror() { |
|
812 return Klass::cast(SystemDictionary::object_klass())->java_mirror(); |
|
813 } |
|
814 |
|
815 bool MethodHandles::same_basic_type_for_arguments(BasicType src, |
|
816 BasicType dst, |
|
817 bool for_return) { |
|
818 // return values can always be forgotten: |
|
819 if (for_return && dst == T_VOID) return true; |
|
820 assert(src != T_VOID && dst != T_VOID, "should not be here"); |
|
821 if (src == dst) return true; |
|
822 if (type2size[src] != type2size[dst]) return false; |
|
823 // allow reinterpretation casts for integral widening |
|
824 if (is_subword_type(src)) { // subwords can fit in int or other subwords |
|
825 if (dst == T_INT) // any subword fits in an int |
|
826 return true; |
|
827 if (src == T_BOOLEAN) // boolean fits in any subword |
|
828 return is_subword_type(dst); |
|
829 if (src == T_BYTE && dst == T_SHORT) |
|
830 return true; // remaining case: byte fits in short |
|
831 } |
|
832 // allow float/fixed reinterpretation casts |
|
833 if (src == T_FLOAT) return dst == T_INT; |
|
834 if (src == T_INT) return dst == T_FLOAT; |
|
835 if (src == T_DOUBLE) return dst == T_LONG; |
|
836 if (src == T_LONG) return dst == T_DOUBLE; |
|
837 return false; |
|
838 } |
|
839 |
|
840 const char* MethodHandles::check_method_receiver(methodOop m, |
|
841 klassOop passed_recv_type) { |
|
842 assert(!m->is_static(), "caller resp."); |
|
843 if (passed_recv_type == NULL) |
|
844 return "receiver type is primitive"; |
|
845 if (class_cast_needed(passed_recv_type, m->method_holder())) { |
|
846 Klass* formal = Klass::cast(m->method_holder()); |
|
847 return SharedRuntime::generate_class_cast_message("receiver type", |
|
848 formal->external_name()); |
|
849 } |
|
850 return NULL; // checks passed |
|
851 } |
|
852 |
|
853 // Verify that m's signature can be called type-safely by a method handle |
|
854 // of the given method type 'mtype'. |
|
855 // It takes a TRAPS argument because it must perform symbol lookups. |
|
856 void MethodHandles::verify_method_signature(methodHandle m, |
|
857 Handle mtype, |
|
858 int first_ptype_pos, |
|
859 KlassHandle insert_ptype, |
|
860 TRAPS) { |
|
861 objArrayHandle ptypes(THREAD, java_dyn_MethodType::ptypes(mtype())); |
|
862 int pnum = first_ptype_pos; |
|
863 int pmax = ptypes->length(); |
|
864 int mnum = 0; // method argument |
|
865 const char* err = NULL; |
|
866 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) { |
|
867 oop ptype_oop = NULL; |
|
868 if (ss.at_return_type()) { |
|
869 if (pnum != pmax) |
|
870 { err = "too many arguments"; break; } |
|
871 ptype_oop = java_dyn_MethodType::rtype(mtype()); |
|
872 } else { |
|
873 if (pnum >= pmax) |
|
874 { err = "not enough arguments"; break; } |
|
875 if (pnum >= 0) |
|
876 ptype_oop = ptypes->obj_at(pnum); |
|
877 else if (insert_ptype.is_null()) |
|
878 ptype_oop = NULL; |
|
879 else |
|
880 ptype_oop = insert_ptype->java_mirror(); |
|
881 pnum += 1; |
|
882 mnum += 1; |
|
883 } |
|
884 klassOop mklass = NULL; |
|
885 BasicType mtype = ss.type(); |
|
886 if (mtype == T_ARRAY) mtype = T_OBJECT; // fold all refs to T_OBJECT |
|
887 if (mtype == T_OBJECT) { |
|
888 if (ptype_oop == NULL) { |
|
889 // null matches any reference |
|
890 continue; |
|
891 } |
|
892 // If we fail to resolve types at this point, we will throw an error. |
|
893 symbolOop name_oop = ss.as_symbol(CHECK); |
|
894 symbolHandle name(THREAD, name_oop); |
|
895 instanceKlass* mk = instanceKlass::cast(m->method_holder()); |
|
896 Handle loader(THREAD, mk->class_loader()); |
|
897 Handle domain(THREAD, mk->protection_domain()); |
|
898 mklass = SystemDictionary::resolve_or_fail(name, loader, domain, |
|
899 true, CHECK); |
|
900 } |
|
901 if (ptype_oop == NULL) { |
|
902 // null does not match any non-reference; use Object to report the error |
|
903 ptype_oop = object_java_mirror(); |
|
904 } |
|
905 klassOop pklass = NULL; |
|
906 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop, &pklass); |
|
907 if (!ss.at_return_type()) { |
|
908 err = check_argument_type_change(ptype, pklass, mtype, mklass, mnum); |
|
909 } else { |
|
910 err = check_return_type_change(mtype, mklass, ptype, pklass); // note reversal! |
|
911 } |
|
912 if (err != NULL) break; |
|
913 } |
|
914 |
|
915 if (err != NULL) { |
|
916 THROW_MSG(vmSymbols::java_lang_InternalError(), err); |
|
917 } |
|
918 } |
|
919 |
|
920 // Main routine for verifying the MethodHandle.type of a proposed |
|
921 // direct or bound-direct method handle. |
|
922 void MethodHandles::verify_method_type(methodHandle m, |
|
923 Handle mtype, |
|
924 bool has_bound_recv, |
|
925 KlassHandle bound_recv_type, |
|
926 TRAPS) { |
|
927 bool m_needs_receiver = !m->is_static(); |
|
928 |
|
929 const char* err = NULL; |
|
930 |
|
931 int first_ptype_pos = m_needs_receiver ? 1 : 0; |
|
932 if (has_bound_recv && err == NULL) { |
|
933 first_ptype_pos -= 1; |
|
934 if (m_needs_receiver && bound_recv_type.is_null()) |
|
935 { err = "bound receiver is not an object"; goto die; } |
|
936 } |
|
937 |
|
938 if (m_needs_receiver && err == NULL) { |
|
939 objArrayOop ptypes = java_dyn_MethodType::ptypes(mtype()); |
|
940 if (ptypes->length() < first_ptype_pos) |
|
941 { err = "receiver argument is missing"; goto die; } |
|
942 if (first_ptype_pos == -1) |
|
943 err = check_method_receiver(m(), bound_recv_type->as_klassOop()); |
|
944 else |
|
945 err = check_method_receiver(m(), java_lang_Class::as_klassOop(ptypes->obj_at(0))); |
|
946 if (err != NULL) goto die; |
|
947 } |
|
948 |
|
949 // Check the other arguments for mistypes. |
|
950 verify_method_signature(m, mtype, first_ptype_pos, bound_recv_type, CHECK); |
|
951 return; |
|
952 |
|
953 die: |
|
954 THROW_MSG(vmSymbols::java_lang_InternalError(), err); |
|
955 } |
|
956 |
|
957 void MethodHandles::verify_vmslots(Handle mh, TRAPS) { |
|
958 // Verify vmslots. |
|
959 int check_slots = argument_slot_count(java_dyn_MethodHandle::type(mh())); |
|
960 if (java_dyn_MethodHandle::vmslots(mh()) != check_slots) { |
|
961 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH"); |
|
962 } |
|
963 } |
|
964 |
|
965 void MethodHandles::verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS) { |
|
966 // Verify that argslot points at the given argnum. |
|
967 int check_slot = argument_slot(java_dyn_MethodHandle::type(mh()), argnum); |
|
968 if (argslot != check_slot || argslot < 0) { |
|
969 const char* fmt = "for argnum of %d, vmargslot is %d, should be %d"; |
|
970 size_t msglen = strlen(fmt) + 3*11 + 1; |
|
971 char* msg = NEW_RESOURCE_ARRAY(char, msglen); |
|
972 jio_snprintf(msg, msglen, fmt, argnum, argslot, check_slot); |
|
973 THROW_MSG(vmSymbols::java_lang_InternalError(), msg); |
|
974 } |
|
975 } |
|
976 |
|
977 // Verify the correspondence between two method types. |
|
978 // Apart from the advertised changes, caller method type X must |
|
979 // be able to invoke the callee method Y type with no violations |
|
980 // of type integrity. |
|
981 // Return NULL if all is well, else a short error message. |
|
982 const char* MethodHandles::check_method_type_change(oop src_mtype, int src_beg, int src_end, |
|
983 int insert_argnum, oop insert_type, |
|
984 int change_argnum, oop change_type, |
|
985 int delete_argnum, |
|
986 oop dst_mtype, int dst_beg, int dst_end) { |
|
987 objArrayOop src_ptypes = java_dyn_MethodType::ptypes(src_mtype); |
|
988 objArrayOop dst_ptypes = java_dyn_MethodType::ptypes(dst_mtype); |
|
989 |
|
990 int src_max = src_ptypes->length(); |
|
991 int dst_max = dst_ptypes->length(); |
|
992 |
|
993 if (src_end == -1) src_end = src_max; |
|
994 if (dst_end == -1) dst_end = dst_max; |
|
995 |
|
996 assert(0 <= src_beg && src_beg <= src_end && src_end <= src_max, "oob"); |
|
997 assert(0 <= dst_beg && dst_beg <= dst_end && dst_end <= dst_max, "oob"); |
|
998 |
|
999 // pending actions; set to -1 when done: |
|
1000 int ins_idx = insert_argnum, chg_idx = change_argnum, del_idx = delete_argnum; |
|
1001 |
|
1002 const char* err = NULL; |
|
1003 |
|
1004 // Walk along each array of parameter types, including a virtual |
|
1005 // NULL end marker at the end of each. |
|
1006 for (int src_idx = src_beg, dst_idx = dst_beg; |
|
1007 (src_idx <= src_end && dst_idx <= dst_end); |
|
1008 src_idx++, dst_idx++) { |
|
1009 oop src_type = (src_idx == src_end) ? oop(NULL) : src_ptypes->obj_at(src_idx); |
|
1010 oop dst_type = (dst_idx == dst_end) ? oop(NULL) : dst_ptypes->obj_at(dst_idx); |
|
1011 bool fix_null_src_type = false; |
|
1012 |
|
1013 // Perform requested edits. |
|
1014 if (ins_idx == src_idx) { |
|
1015 // note that the inserted guy is never affected by a change or deletion |
|
1016 ins_idx = -1; |
|
1017 src_type = insert_type; |
|
1018 fix_null_src_type = true; |
|
1019 --src_idx; // back up to process src type on next loop |
|
1020 src_idx = src_end; |
|
1021 } else { |
|
1022 // note that the changed guy can be immediately deleted |
|
1023 if (chg_idx == src_idx) { |
|
1024 chg_idx = -1; |
|
1025 assert(src_idx < src_end, "oob"); |
|
1026 src_type = change_type; |
|
1027 fix_null_src_type = true; |
|
1028 } |
|
1029 if (del_idx == src_idx) { |
|
1030 del_idx = -1; |
|
1031 assert(src_idx < src_end, "oob"); |
|
1032 --dst_idx; |
|
1033 continue; // rerun loop after skipping this position |
|
1034 } |
|
1035 } |
|
1036 |
|
1037 if (src_type == NULL && fix_null_src_type) |
|
1038 // explicit null in this case matches any dest reference |
|
1039 src_type = (java_lang_Class::is_primitive(dst_type) ? object_java_mirror() : dst_type); |
|
1040 |
|
1041 // Compare the two argument types. |
|
1042 if (src_type != dst_type) { |
|
1043 if (src_type == NULL) return "not enough arguments"; |
|
1044 if (dst_type == NULL) return "too many arguments"; |
|
1045 err = check_argument_type_change(src_type, dst_type, dst_idx); |
|
1046 if (err != NULL) return err; |
|
1047 } |
|
1048 } |
|
1049 |
|
1050 // Now compare return types also. |
|
1051 oop src_rtype = java_dyn_MethodType::rtype(src_mtype); |
|
1052 oop dst_rtype = java_dyn_MethodType::rtype(dst_mtype); |
|
1053 if (src_rtype != dst_rtype) { |
|
1054 err = check_return_type_change(dst_rtype, src_rtype); // note reversal! |
|
1055 if (err != NULL) return err; |
|
1056 } |
|
1057 |
|
1058 assert(err == NULL, ""); |
|
1059 return NULL; // all is well |
|
1060 } |
|
1061 |
|
1062 |
|
1063 const char* MethodHandles::check_argument_type_change(BasicType src_type, |
|
1064 klassOop src_klass, |
|
1065 BasicType dst_type, |
|
1066 klassOop dst_klass, |
|
1067 int argnum) { |
|
1068 const char* err = NULL; |
|
1069 |
|
1070 // just in case: |
|
1071 if (src_type == T_ARRAY) src_type = T_OBJECT; |
|
1072 if (dst_type == T_ARRAY) dst_type = T_OBJECT; |
|
1073 |
|
1074 // Produce some nice messages if VerifyMethodHandles is turned on: |
|
1075 if (!same_basic_type_for_arguments(src_type, dst_type, (argnum < 0))) { |
|
1076 if (src_type == T_OBJECT) { |
|
1077 err = ((argnum >= 0) |
|
1078 ? "type mismatch: passing a %s for method argument #%d, which expects primitive %s" |
|
1079 : "type mismatch: returning a %s, but caller expects primitive %s"); |
|
1080 } else if (dst_type == T_OBJECT) { |
|
1081 err = ((argnum < 0) |
|
1082 ? "type mismatch: passing a primitive %s for method argument #%d, which expects %s" |
|
1083 : "type mismatch: returning a primitive %s, but caller expects %s"); |
|
1084 } else { |
|
1085 err = ((argnum < 0) |
|
1086 ? "type mismatch: passing a %s for method argument #%d, which expects %s" |
|
1087 : "type mismatch: returning a %s, but caller expects %s"); |
|
1088 } |
|
1089 } else if (src_type == T_OBJECT && class_cast_needed(src_klass, dst_klass)) { |
|
1090 if (!class_cast_needed(dst_klass, src_klass)) { |
|
1091 err = ((argnum < 0) |
|
1092 ? "cast required: passing a %s for method argument #%d, which expects %s" |
|
1093 : "cast required: returning a %s, but caller expects %s"); |
|
1094 } else { |
|
1095 err = ((argnum < 0) |
|
1096 ? "reference mismatch: passing a %s for method argument #%d, which expects %s" |
|
1097 : "reference mismatch: returning a %s, but caller expects %s"); |
|
1098 } |
|
1099 } else { |
|
1100 // passed the obstacle course |
|
1101 return NULL; |
|
1102 } |
|
1103 |
|
1104 // format, format, format |
|
1105 const char* src_name = type2name(src_type); |
|
1106 const char* dst_name = type2name(dst_type); |
|
1107 if (src_type == T_OBJECT) src_name = Klass::cast(src_klass)->external_name(); |
|
1108 if (dst_type == T_OBJECT) dst_name = Klass::cast(dst_klass)->external_name(); |
|
1109 if (src_name == NULL) src_name = "unknown type"; |
|
1110 if (dst_name == NULL) dst_name = "unknown type"; |
|
1111 |
|
1112 size_t msglen = strlen(err) + strlen(src_name) + strlen(dst_name) + (argnum < 10 ? 1 : 11); |
|
1113 char* msg = NEW_RESOURCE_ARRAY(char, msglen + 1); |
|
1114 if (argnum >= 0) { |
|
1115 assert(strstr(err, "%d") != NULL, ""); |
|
1116 jio_snprintf(msg, msglen, err, src_name, argnum, dst_name); |
|
1117 } else { |
|
1118 assert(strstr(err, "%d") == NULL, ""); |
|
1119 jio_snprintf(msg, msglen, err, src_name, dst_name); |
|
1120 } |
|
1121 return msg; |
|
1122 } |
|
1123 |
|
1124 // Compute the depth within the stack of the given argument, i.e., |
|
1125 // the combined size of arguments to the right of the given argument. |
|
1126 // For the last argument (ptypes.length-1) this will be zero. |
|
1127 // For the first argument (0) this will be the size of all |
|
1128 // arguments but that one. For the special number -1, this |
|
1129 // will be the size of all arguments, including the first. |
|
1130 // If the argument is neither -1 nor a valid argument index, |
|
1131 // then return a negative number. Otherwise, the result |
|
1132 // is in the range [0..vmslots] inclusive. |
|
1133 int MethodHandles::argument_slot(oop method_type, int arg) { |
|
1134 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); |
|
1135 int argslot = 0; |
|
1136 int len = ptypes->length(); |
|
1137 if (arg < -1 || arg >= len) return -99; |
|
1138 for (int i = len-1; i > arg; i--) { |
|
1139 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); |
|
1140 argslot += type2size[bt]; |
|
1141 } |
|
1142 assert(argument_slot_to_argnum(method_type, argslot) == arg, "inverse works"); |
|
1143 return argslot; |
|
1144 } |
|
1145 |
|
1146 // Given a slot number, return the argument number. |
|
1147 int MethodHandles::argument_slot_to_argnum(oop method_type, int query_argslot) { |
|
1148 objArrayOop ptypes = java_dyn_MethodType::ptypes(method_type); |
|
1149 int argslot = 0; |
|
1150 int len = ptypes->length(); |
|
1151 for (int i = len-1; i >= 0; i--) { |
|
1152 if (query_argslot == argslot) return i; |
|
1153 BasicType bt = java_lang_Class::as_BasicType(ptypes->obj_at(i)); |
|
1154 argslot += type2size[bt]; |
|
1155 } |
|
1156 // return pseudo-arg deepest in stack: |
|
1157 if (query_argslot == argslot) return -1; |
|
1158 return -99; // oob slot, or splitting a double-slot arg |
|
1159 } |
|
1160 |
|
1161 methodHandle MethodHandles::dispatch_decoded_method(methodHandle m, |
|
1162 KlassHandle receiver_limit, |
|
1163 int decode_flags, |
|
1164 KlassHandle receiver_klass, |
|
1165 TRAPS) { |
|
1166 assert((decode_flags & ~_DMF_DIRECT_MASK) == 0, "must be direct method reference"); |
|
1167 assert((decode_flags & _dmf_has_receiver) != 0, "must have a receiver or first reference argument"); |
|
1168 |
|
1169 if (!m->is_static() && |
|
1170 (receiver_klass.is_null() || !receiver_klass->is_subtype_of(m->method_holder()))) |
|
1171 // given type does not match class of method, or receiver is null! |
|
1172 // caller should have checked this, but let's be extra careful... |
|
1173 return methodHandle(); |
|
1174 |
|
1175 if (receiver_limit.not_null() && |
|
1176 (receiver_klass.not_null() && !receiver_klass->is_subtype_of(receiver_limit()))) |
|
1177 // given type is not limited to the receiver type |
|
1178 // note that a null receiver can match any reference value, for a static method |
|
1179 return methodHandle(); |
|
1180 |
|
1181 if (!(decode_flags & MethodHandles::_dmf_does_dispatch)) { |
|
1182 // pre-dispatched or static method (null receiver is OK for static) |
|
1183 return m; |
|
1184 |
|
1185 } else if (receiver_klass.is_null()) { |
|
1186 // null receiver value; cannot dispatch |
|
1187 return methodHandle(); |
|
1188 |
|
1189 } else if (!(decode_flags & MethodHandles::_dmf_from_interface)) { |
|
1190 // perform virtual dispatch |
|
1191 int vtable_index = m->vtable_index(); |
|
1192 guarantee(vtable_index >= 0, "valid vtable index"); |
|
1193 |
|
1194 // receiver_klass might be an arrayKlassOop but all vtables start at |
|
1195 // the same place. The cast is to avoid virtual call and assertion. |
|
1196 // See also LinkResolver::runtime_resolve_virtual_method. |
|
1197 instanceKlass* inst = (instanceKlass*)Klass::cast(receiver_klass()); |
|
1198 DEBUG_ONLY(inst->verify_vtable_index(vtable_index)); |
|
1199 methodOop m_oop = inst->method_at_vtable(vtable_index); |
|
1200 return methodHandle(THREAD, m_oop); |
|
1201 |
|
1202 } else { |
|
1203 // perform interface dispatch |
|
1204 int itable_index = klassItable::compute_itable_index(m()); |
|
1205 guarantee(itable_index >= 0, "valid itable index"); |
|
1206 instanceKlass* inst = instanceKlass::cast(receiver_klass()); |
|
1207 methodOop m_oop = inst->method_at_itable(m->method_holder(), itable_index, THREAD); |
|
1208 return methodHandle(THREAD, m_oop); |
|
1209 } |
|
1210 } |
|
1211 |
|
1212 void MethodHandles::verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS) { |
|
1213 // Verify type. |
|
1214 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); |
|
1215 verify_method_type(m, mtype, false, KlassHandle(), CHECK); |
|
1216 |
|
1217 // Verify vmslots. |
|
1218 if (java_dyn_MethodHandle::vmslots(mh()) != m->size_of_parameters()) { |
|
1219 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in DMH"); |
|
1220 } |
|
1221 } |
|
1222 |
|
1223 void MethodHandles::init_DirectMethodHandle(Handle mh, methodHandle m, bool do_dispatch, TRAPS) { |
|
1224 // Check arguments. |
|
1225 if (mh.is_null() || m.is_null() || |
|
1226 (!do_dispatch && m->is_abstract())) { |
|
1227 THROW(vmSymbols::java_lang_InternalError()); |
|
1228 } |
|
1229 |
|
1230 java_dyn_MethodHandle::init_vmslots(mh()); |
|
1231 |
|
1232 if (VerifyMethodHandles) { |
|
1233 // The privileged code which invokes this routine should not make |
|
1234 // a mistake about types, but it's better to verify. |
|
1235 verify_DirectMethodHandle(mh, m, CHECK); |
|
1236 } |
|
1237 |
|
1238 // Finally, after safety checks are done, link to the target method. |
|
1239 // We will follow the same path as the latter part of |
|
1240 // InterpreterRuntime::resolve_invoke(), which first finds the method |
|
1241 // and then decides how to populate the constant pool cache entry |
|
1242 // that links the interpreter calls to the method. We need the same |
|
1243 // bits, and will use the same calling sequence code. |
|
1244 |
|
1245 int vmindex = methodOopDesc::garbage_vtable_index; |
|
1246 oop vmtarget = NULL; |
|
1247 |
|
1248 instanceKlass::cast(m->method_holder())->link_class(CHECK); |
|
1249 |
|
1250 MethodHandleEntry* me = NULL; |
|
1251 if (do_dispatch && Klass::cast(m->method_holder())->is_interface()) { |
|
1252 // We are simulating an invokeinterface instruction. |
|
1253 // (We might also be simulating an invokevirtual on a miranda method, |
|
1254 // but it is safe to treat it as an invokeinterface.) |
|
1255 assert(!m->can_be_statically_bound(), "no final methods on interfaces"); |
|
1256 vmindex = klassItable::compute_itable_index(m()); |
|
1257 assert(vmindex >= 0, "(>=0) == do_dispatch"); |
|
1258 // Set up same bits as ConstantPoolCacheEntry::set_interface_call(). |
|
1259 vmtarget = m->method_holder(); // the interface |
|
1260 me = MethodHandles::entry(MethodHandles::_invokeinterface_mh); |
|
1261 } else if (!do_dispatch || m->can_be_statically_bound()) { |
|
1262 // We are simulating an invokestatic or invokespecial instruction. |
|
1263 // Set up the method pointer, just like ConstantPoolCacheEntry::set_method(). |
|
1264 vmtarget = m(); |
|
1265 // this does not help dispatch, but it will make it possible to parse this MH: |
|
1266 vmindex = methodOopDesc::nonvirtual_vtable_index; |
|
1267 assert(vmindex < 0, "(>=0) == do_dispatch"); |
|
1268 if (!m->is_static()) { |
|
1269 me = MethodHandles::entry(MethodHandles::_invokespecial_mh); |
|
1270 } else { |
|
1271 me = MethodHandles::entry(MethodHandles::_invokestatic_mh); |
|
1272 // Part of the semantics of a static call is an initialization barrier. |
|
1273 // For a DMH, it is done now, when the handle is created. |
|
1274 Klass* k = Klass::cast(m->method_holder()); |
|
1275 if (k->should_be_initialized()) { |
|
1276 k->initialize(CHECK); |
|
1277 } |
|
1278 } |
|
1279 } else { |
|
1280 // We are simulating an invokevirtual instruction. |
|
1281 // Set up the vtable index, just like ConstantPoolCacheEntry::set_method(). |
|
1282 // The key logic is LinkResolver::runtime_resolve_virtual_method. |
|
1283 vmindex = m->vtable_index(); |
|
1284 vmtarget = m->method_holder(); |
|
1285 me = MethodHandles::entry(MethodHandles::_invokevirtual_mh); |
|
1286 } |
|
1287 |
|
1288 if (me == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
1289 |
|
1290 sun_dyn_DirectMethodHandle::set_vmtarget(mh(), vmtarget); |
|
1291 sun_dyn_DirectMethodHandle::set_vmindex(mh(), vmindex); |
|
1292 DEBUG_ONLY(int flags; klassOop rlimit); |
|
1293 assert(MethodHandles::decode_method(mh(), rlimit, flags) == m(), |
|
1294 "properly stored for later decoding"); |
|
1295 DEBUG_ONLY(bool actual_do_dispatch = ((flags & _dmf_does_dispatch) != 0)); |
|
1296 assert(!(actual_do_dispatch && !do_dispatch), |
|
1297 "do not perform dispatch if !do_dispatch specified"); |
|
1298 assert(actual_do_dispatch == (vmindex >= 0), "proper later decoding of do_dispatch"); |
|
1299 assert(decode_MethodHandle_stack_pushes(mh()) == 0, "DMH does not move stack"); |
|
1300 |
|
1301 // Done! |
|
1302 java_dyn_MethodHandle::set_vmentry(mh(), me); |
|
1303 } |
|
1304 |
|
1305 void MethodHandles::verify_BoundMethodHandle_with_receiver(Handle mh, |
|
1306 methodHandle m, |
|
1307 TRAPS) { |
|
1308 // Verify type. |
|
1309 oop receiver = sun_dyn_BoundMethodHandle::argument(mh()); |
|
1310 Handle mtype(THREAD, java_dyn_MethodHandle::type(mh())); |
|
1311 KlassHandle bound_recv_type; |
|
1312 if (receiver != NULL) bound_recv_type = KlassHandle(THREAD, receiver->klass()); |
|
1313 verify_method_type(m, mtype, true, bound_recv_type, CHECK); |
|
1314 |
|
1315 int receiver_pos = m->size_of_parameters() - 1; |
|
1316 |
|
1317 // Verify MH.vmargslot, which should point at the bound receiver. |
|
1318 verify_vmargslot(mh, -1, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); |
|
1319 //verify_vmslots(mh, CHECK); |
|
1320 |
|
1321 // Verify vmslots. |
|
1322 if (java_dyn_MethodHandle::vmslots(mh()) != receiver_pos) { |
|
1323 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad vmslots in BMH (receiver)"); |
|
1324 } |
|
1325 } |
|
1326 |
|
1327 // Initialize a BMH with a receiver bound directly to a methodOop. |
|
1328 void MethodHandles::init_BoundMethodHandle_with_receiver(Handle mh, |
|
1329 methodHandle original_m, |
|
1330 KlassHandle receiver_limit, |
|
1331 int decode_flags, |
|
1332 TRAPS) { |
|
1333 // Check arguments. |
|
1334 if (mh.is_null() || original_m.is_null()) { |
|
1335 THROW(vmSymbols::java_lang_InternalError()); |
|
1336 } |
|
1337 |
|
1338 KlassHandle receiver_klass; |
|
1339 { |
|
1340 oop receiver_oop = sun_dyn_BoundMethodHandle::argument(mh()); |
|
1341 if (receiver_oop != NULL) |
|
1342 receiver_klass = KlassHandle(THREAD, receiver_oop->klass()); |
|
1343 } |
|
1344 methodHandle m = dispatch_decoded_method(original_m, |
|
1345 receiver_limit, decode_flags, |
|
1346 receiver_klass, |
|
1347 CHECK); |
|
1348 if (m.is_null()) { THROW(vmSymbols::java_lang_InternalError()); } |
|
1349 if (m->is_abstract()) { THROW(vmSymbols::java_lang_AbstractMethodError()); } |
|
1350 |
|
1351 java_dyn_MethodHandle::init_vmslots(mh()); |
|
1352 |
|
1353 if (VerifyMethodHandles) { |
|
1354 verify_BoundMethodHandle_with_receiver(mh, m, CHECK); |
|
1355 } |
|
1356 |
|
1357 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); |
|
1358 |
|
1359 DEBUG_ONLY(int junk; klassOop junk2); |
|
1360 assert(MethodHandles::decode_method(mh(), junk2, junk) == m(), "properly stored for later decoding"); |
|
1361 assert(decode_MethodHandle_stack_pushes(mh()) == 1, "BMH pushes one stack slot"); |
|
1362 |
|
1363 // Done! |
|
1364 java_dyn_MethodHandle::set_vmentry(mh(), MethodHandles::entry(MethodHandles::_bound_ref_direct_mh)); |
|
1365 } |
|
1366 |
|
1367 void MethodHandles::verify_BoundMethodHandle(Handle mh, Handle target, int argnum, |
|
1368 bool direct_to_method, TRAPS) { |
|
1369 Handle ptype_handle(THREAD, |
|
1370 java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum)); |
|
1371 KlassHandle ptype_klass; |
|
1372 BasicType ptype = java_lang_Class::as_BasicType(ptype_handle(), &ptype_klass); |
|
1373 int slots_pushed = type2size[ptype]; |
|
1374 |
|
1375 oop argument = sun_dyn_BoundMethodHandle::argument(mh()); |
|
1376 |
|
1377 const char* err = NULL; |
|
1378 |
|
1379 switch (ptype) { |
|
1380 case T_OBJECT: |
|
1381 if (argument != NULL) |
|
1382 // we must implicitly convert from the arg type to the outgoing ptype |
|
1383 err = check_argument_type_change(T_OBJECT, argument->klass(), ptype, ptype_klass(), argnum); |
|
1384 break; |
|
1385 |
|
1386 case T_ARRAY: case T_VOID: |
|
1387 assert(false, "array, void do not appear here"); |
|
1388 default: |
|
1389 if (ptype != T_INT && !is_subword_type(ptype)) { |
|
1390 err = "unexpected parameter type"; |
|
1391 break; |
|
1392 } |
|
1393 // check subrange of Integer.value, if necessary |
|
1394 if (argument == NULL || argument->klass() != SystemDictionary::int_klass()) { |
|
1395 err = "bound integer argument must be of type java.lang.Integer"; |
|
1396 break; |
|
1397 } |
|
1398 if (ptype != T_INT) { |
|
1399 int value_offset = java_lang_boxing_object::value_offset_in_bytes(T_INT); |
|
1400 jint value = argument->int_field(value_offset); |
|
1401 int vminfo = adapter_subword_vminfo(ptype); |
|
1402 jint subword = truncate_subword_from_vminfo(value, vminfo); |
|
1403 if (value != subword) { |
|
1404 err = "bound subword value does not fit into the subword type"; |
|
1405 break; |
|
1406 } |
|
1407 } |
|
1408 break; |
|
1409 case T_FLOAT: |
|
1410 case T_DOUBLE: |
|
1411 case T_LONG: |
|
1412 { |
|
1413 // we must implicitly convert from the unboxed arg type to the outgoing ptype |
|
1414 BasicType argbox = java_lang_boxing_object::basic_type(argument); |
|
1415 if (argbox != ptype) { |
|
1416 err = check_argument_type_change(T_OBJECT, (argument == NULL |
|
1417 ? SystemDictionary::object_klass() |
|
1418 : argument->klass()), |
|
1419 ptype, ptype_klass(), argnum); |
|
1420 assert(err != NULL, "this must be an error"); |
|
1421 } |
|
1422 break; |
|
1423 } |
|
1424 } |
|
1425 |
|
1426 if (err == NULL) { |
|
1427 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
|
1428 if (direct_to_method) { |
|
1429 assert(this_pushes == slots_pushed, "BMH pushes one or two stack slots"); |
|
1430 assert(slots_pushed <= MethodHandlePushLimit, ""); |
|
1431 } else { |
|
1432 int prev_pushes = decode_MethodHandle_stack_pushes(target()); |
|
1433 assert(this_pushes == slots_pushed + prev_pushes, "BMH stack motion must be correct"); |
|
1434 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
|
1435 if (slots_pushed + prev_pushes > MethodHandlePushLimit) |
|
1436 err = "too many bound parameters"; |
|
1437 } |
|
1438 } |
|
1439 |
|
1440 if (err == NULL) { |
|
1441 // Verify the rest of the method type. |
|
1442 err = check_method_type_insertion(java_dyn_MethodHandle::type(mh()), |
|
1443 argnum, ptype_handle(), |
|
1444 java_dyn_MethodHandle::type(target())); |
|
1445 } |
|
1446 |
|
1447 if (err != NULL) { |
|
1448 THROW_MSG(vmSymbols::java_lang_InternalError(), err); |
|
1449 } |
|
1450 } |
|
1451 |
|
1452 void MethodHandles::init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { |
|
1453 // Check arguments. |
|
1454 if (mh.is_null() || target.is_null() || !java_dyn_MethodHandle::is_instance(target())) { |
|
1455 THROW(vmSymbols::java_lang_InternalError()); |
|
1456 } |
|
1457 |
|
1458 java_dyn_MethodHandle::init_vmslots(mh()); |
|
1459 |
|
1460 if (VerifyMethodHandles) { |
|
1461 int insert_after = argnum - 1; |
|
1462 verify_vmargslot(mh, insert_after, sun_dyn_BoundMethodHandle::vmargslot(mh()), CHECK); |
|
1463 verify_vmslots(mh, CHECK); |
|
1464 } |
|
1465 |
|
1466 // If (a) the target is a direct non-dispatched method handle, |
|
1467 // or (b) the target is a dispatched direct method handle and we |
|
1468 // are binding the receiver, cut out the middle-man. |
|
1469 // Do this by decoding the DMH and using its methodOop directly as vmtarget. |
|
1470 bool direct_to_method = false; |
|
1471 if (OptimizeMethodHandles && |
|
1472 target->klass() == SystemDictionary::DirectMethodHandle_klass() && |
|
1473 (argnum == 0 || sun_dyn_DirectMethodHandle::vmindex(target()) < 0)) { |
|
1474 int decode_flags = 0; klassOop receiver_limit_oop = NULL; |
|
1475 methodHandle m(THREAD, decode_method(target(), receiver_limit_oop, decode_flags)); |
|
1476 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "DMH failed to decode"); } |
|
1477 DEBUG_ONLY(int m_vmslots = m->size_of_parameters() - 1); // pos. of 1st arg. |
|
1478 assert(sun_dyn_BoundMethodHandle::vmslots(mh()) == m_vmslots, "type w/ m sig"); |
|
1479 if (argnum == 0 && (decode_flags & _dmf_has_receiver) != 0) { |
|
1480 KlassHandle receiver_limit(THREAD, receiver_limit_oop); |
|
1481 init_BoundMethodHandle_with_receiver(mh, m, |
|
1482 receiver_limit, decode_flags, |
|
1483 CHECK); |
|
1484 return; |
|
1485 } |
|
1486 |
|
1487 // Even if it is not a bound receiver, we still might be able |
|
1488 // to bind another argument and still invoke the methodOop directly. |
|
1489 if (!(decode_flags & _dmf_does_dispatch)) { |
|
1490 direct_to_method = true; |
|
1491 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), m()); |
|
1492 } |
|
1493 } |
|
1494 if (!direct_to_method) |
|
1495 sun_dyn_BoundMethodHandle::set_vmtarget(mh(), target()); |
|
1496 |
|
1497 if (VerifyMethodHandles) { |
|
1498 verify_BoundMethodHandle(mh, target, argnum, direct_to_method, CHECK); |
|
1499 } |
|
1500 |
|
1501 // Next question: Is this a ref, int, or long bound value? |
|
1502 oop ptype_oop = java_dyn_MethodType::ptype(java_dyn_MethodHandle::type(target()), argnum); |
|
1503 BasicType ptype = java_lang_Class::as_BasicType(ptype_oop); |
|
1504 int slots_pushed = type2size[ptype]; |
|
1505 |
|
1506 MethodHandleEntry* me = NULL; |
|
1507 if (ptype == T_OBJECT) { |
|
1508 if (direct_to_method) me = MethodHandles::entry(_bound_ref_direct_mh); |
|
1509 else me = MethodHandles::entry(_bound_ref_mh); |
|
1510 } else if (slots_pushed == 2) { |
|
1511 if (direct_to_method) me = MethodHandles::entry(_bound_long_direct_mh); |
|
1512 else me = MethodHandles::entry(_bound_long_mh); |
|
1513 } else if (slots_pushed == 1) { |
|
1514 if (direct_to_method) me = MethodHandles::entry(_bound_int_direct_mh); |
|
1515 else me = MethodHandles::entry(_bound_int_mh); |
|
1516 } else { |
|
1517 assert(false, ""); |
|
1518 } |
|
1519 |
|
1520 // Done! |
|
1521 java_dyn_MethodHandle::set_vmentry(mh(), me); |
|
1522 } |
|
1523 |
|
1524 static void throw_InternalError_for_bad_conversion(int conversion, const char* err, TRAPS) { |
|
1525 char msg[200]; |
|
1526 jio_snprintf(msg, sizeof(msg), "bad adapter (conversion=0x%08x): %s", conversion, err); |
|
1527 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), msg); |
|
1528 } |
|
1529 |
|
1530 void MethodHandles::verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS) { |
|
1531 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); |
|
1532 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); |
|
1533 |
|
1534 verify_vmargslot(mh, argnum, argslot, CHECK); |
|
1535 verify_vmslots(mh, CHECK); |
|
1536 |
|
1537 jint conv_op = adapter_conversion_op(conversion); |
|
1538 if (!conv_op_valid(conv_op)) { |
|
1539 throw_InternalError_for_bad_conversion(conversion, "unknown conversion op", THREAD); |
|
1540 return; |
|
1541 } |
|
1542 EntryKind ek = adapter_entry_kind(conv_op); |
|
1543 |
|
1544 int stack_move = adapter_conversion_stack_move(conversion); |
|
1545 BasicType src = adapter_conversion_src_type(conversion); |
|
1546 BasicType dest = adapter_conversion_dest_type(conversion); |
|
1547 int vminfo = adapter_conversion_vminfo(conversion); // should be zero |
|
1548 |
|
1549 Handle argument(THREAD, sun_dyn_AdapterMethodHandle::argument(mh())); |
|
1550 Handle target(THREAD, sun_dyn_AdapterMethodHandle::vmtarget(mh())); |
|
1551 Handle src_mtype(THREAD, java_dyn_MethodHandle::type(mh())); |
|
1552 Handle dst_mtype(THREAD, java_dyn_MethodHandle::type(target())); |
|
1553 |
|
1554 const char* err = NULL; |
|
1555 |
|
1556 if (err == NULL) { |
|
1557 // Check that the correct argument is supplied, but only if it is required. |
|
1558 switch (ek) { |
|
1559 case _adapter_check_cast: // target type of cast |
|
1560 case _adapter_ref_to_prim: // wrapper type from which to unbox |
|
1561 case _adapter_prim_to_ref: // wrapper type to box into |
|
1562 case _adapter_collect_args: // array type to collect into |
|
1563 case _adapter_spread_args: // array type to spread from |
|
1564 if (!java_lang_Class::is_instance(argument()) |
|
1565 || java_lang_Class::is_primitive(argument())) |
|
1566 { err = "adapter requires argument of type java.lang.Class"; break; } |
|
1567 if (ek == _adapter_collect_args || |
|
1568 ek == _adapter_spread_args) { |
|
1569 // Make sure it is a suitable collection type. (Array, for now.) |
|
1570 Klass* ak = Klass::cast(java_lang_Class::as_klassOop(argument())); |
|
1571 if (!ak->oop_is_objArray()) { |
|
1572 { err = "adapter requires argument of type java.lang.Class<Object[]>"; break; } |
|
1573 } |
|
1574 } |
|
1575 break; |
|
1576 case _adapter_flyby: |
|
1577 case _adapter_ricochet: |
|
1578 if (!java_dyn_MethodHandle::is_instance(argument())) |
|
1579 { err = "MethodHandle adapter argument required"; break; } |
|
1580 break; |
|
1581 default: |
|
1582 if (argument.not_null()) |
|
1583 { err = "adapter has spurious argument"; break; } |
|
1584 break; |
|
1585 } |
|
1586 } |
|
1587 |
|
1588 if (err == NULL) { |
|
1589 // Check that the src/dest types are supplied if needed. |
|
1590 switch (ek) { |
|
1591 case _adapter_prim_to_prim: |
|
1592 if (!is_java_primitive(src) || !is_java_primitive(dest) || src == dest) { |
|
1593 err = "adapter requires primitive src/dest conversion subfields"; break; |
|
1594 } |
|
1595 if ( (src == T_FLOAT || src == T_DOUBLE) && !(dest == T_FLOAT || dest == T_DOUBLE) || |
|
1596 !(src == T_FLOAT || src == T_DOUBLE) && (dest == T_FLOAT || dest == T_DOUBLE)) { |
|
1597 err = "adapter cannot convert beween floating and fixed-point"; break; |
|
1598 } |
|
1599 break; |
|
1600 case _adapter_ref_to_prim: |
|
1601 if (src != T_OBJECT || !is_java_primitive(dest) |
|
1602 || argument() != Klass::cast(SystemDictionary::box_klass(dest))->java_mirror()) { |
|
1603 err = "adapter requires primitive dest conversion subfield"; break; |
|
1604 } |
|
1605 break; |
|
1606 case _adapter_prim_to_ref: |
|
1607 if (!is_java_primitive(src) || dest != T_OBJECT |
|
1608 || argument() != Klass::cast(SystemDictionary::box_klass(src))->java_mirror()) { |
|
1609 err = "adapter requires primitive src conversion subfield"; break; |
|
1610 } |
|
1611 break; |
|
1612 case _adapter_swap_args: |
|
1613 case _adapter_rot_args: |
|
1614 { |
|
1615 if (!src || src != dest) { |
|
1616 err = "adapter requires src/dest conversion subfields for swap"; break; |
|
1617 } |
|
1618 int swap_size = type2size[src]; |
|
1619 oop src_mtype = sun_dyn_AdapterMethodHandle::type(target()); |
|
1620 oop dest_mtype = sun_dyn_AdapterMethodHandle::type(mh()); |
|
1621 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(src_mtype); |
|
1622 int src_slot = argslot; |
|
1623 int dest_slot = vminfo; |
|
1624 bool rotate_up = (src_slot > dest_slot); // upward rotation |
|
1625 int src_arg = argnum; |
|
1626 int dest_arg = argument_slot_to_argnum(dest_mtype, dest_slot); |
|
1627 verify_vmargslot(mh, dest_arg, dest_slot, CHECK); |
|
1628 if (!(dest_slot >= src_slot + swap_size) && |
|
1629 !(src_slot >= dest_slot + swap_size)) { |
|
1630 err = "source, destination slots must be distinct"; |
|
1631 } else if (ek == _adapter_swap_args && !(src_slot > dest_slot)) { |
|
1632 err = "source of swap must be deeper in stack"; |
|
1633 } else if (ek == _adapter_swap_args) { |
|
1634 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, dest_arg), |
|
1635 java_dyn_MethodType::ptype(dest_mtype, src_arg), |
|
1636 dest_arg); |
|
1637 } else if (ek == _adapter_rot_args) { |
|
1638 if (rotate_up) { |
|
1639 assert((src_slot > dest_slot) && (src_arg < dest_arg), ""); |
|
1640 // rotate up: [dest_slot..src_slot-ss] --> [dest_slot+ss..src_slot] |
|
1641 // that is: [src_arg+1..dest_arg] --> [src_arg..dest_arg-1] |
|
1642 for (int i = src_arg+1; i <= dest_arg && err == NULL; i++) { |
|
1643 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), |
|
1644 java_dyn_MethodType::ptype(dest_mtype, i-1), |
|
1645 i); |
|
1646 } |
|
1647 } else { // rotate down |
|
1648 assert((src_slot < dest_slot) && (src_arg > dest_arg), ""); |
|
1649 // rotate down: [src_slot+ss..dest_slot] --> [src_slot..dest_slot-ss] |
|
1650 // that is: [dest_arg..src_arg-1] --> [dst_arg+1..src_arg] |
|
1651 for (int i = dest_arg; i <= src_arg-1 && err == NULL; i++) { |
|
1652 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, i), |
|
1653 java_dyn_MethodType::ptype(dest_mtype, i+1), |
|
1654 i); |
|
1655 } |
|
1656 } |
|
1657 } |
|
1658 if (err == NULL) |
|
1659 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype, src_arg), |
|
1660 java_dyn_MethodType::ptype(dest_mtype, dest_arg), |
|
1661 src_arg); |
|
1662 } |
|
1663 break; |
|
1664 case _adapter_collect_args: |
|
1665 case _adapter_spread_args: |
|
1666 { |
|
1667 BasicType coll_type = (ek == _adapter_collect_args) ? dest : src; |
|
1668 BasicType elem_type = (ek == _adapter_collect_args) ? src : dest; |
|
1669 if (coll_type != T_OBJECT || elem_type != T_OBJECT) { |
|
1670 err = "adapter requires src/dest subfields"; break; |
|
1671 // later: |
|
1672 // - consider making coll be a primitive array |
|
1673 // - consider making coll be a heterogeneous collection |
|
1674 } |
|
1675 } |
|
1676 break; |
|
1677 default: |
|
1678 if (src != 0 || dest != 0) { |
|
1679 err = "adapter has spurious src/dest conversion subfields"; break; |
|
1680 } |
|
1681 break; |
|
1682 } |
|
1683 } |
|
1684 |
|
1685 if (err == NULL) { |
|
1686 // Check the stack_move subfield. |
|
1687 // It must always report the net change in stack size, positive or negative. |
|
1688 int slots_pushed = stack_move / stack_move_unit(); |
|
1689 switch (ek) { |
|
1690 case _adapter_prim_to_prim: |
|
1691 case _adapter_ref_to_prim: |
|
1692 case _adapter_prim_to_ref: |
|
1693 if (slots_pushed != type2size[dest] - type2size[src]) { |
|
1694 err = "wrong stack motion for primitive conversion"; |
|
1695 } |
|
1696 break; |
|
1697 case _adapter_dup_args: |
|
1698 if (slots_pushed <= 0) { |
|
1699 err = "adapter requires conversion subfield slots_pushed > 0"; |
|
1700 } |
|
1701 break; |
|
1702 case _adapter_drop_args: |
|
1703 if (slots_pushed >= 0) { |
|
1704 err = "adapter requires conversion subfield slots_pushed < 0"; |
|
1705 } |
|
1706 break; |
|
1707 case _adapter_collect_args: |
|
1708 if (slots_pushed > 1) { |
|
1709 err = "adapter requires conversion subfield slots_pushed <= 1"; |
|
1710 } |
|
1711 break; |
|
1712 case _adapter_spread_args: |
|
1713 if (slots_pushed < -1) { |
|
1714 err = "adapter requires conversion subfield slots_pushed >= -1"; |
|
1715 } |
|
1716 break; |
|
1717 default: |
|
1718 if (stack_move != 0) { |
|
1719 err = "adapter has spurious stack_move conversion subfield"; |
|
1720 } |
|
1721 break; |
|
1722 } |
|
1723 if (err == NULL && stack_move != slots_pushed * stack_move_unit()) { |
|
1724 err = "stack_move conversion subfield must be multiple of stack_move_unit"; |
|
1725 } |
|
1726 } |
|
1727 |
|
1728 if (err == NULL) { |
|
1729 // Make sure this adapter does not push too deeply. |
|
1730 int slots_pushed = stack_move / stack_move_unit(); |
|
1731 int this_vmslots = java_dyn_MethodHandle::vmslots(mh()); |
|
1732 int prev_vmslots = java_dyn_MethodHandle::vmslots(target()); |
|
1733 if (slots_pushed != (this_vmslots - prev_vmslots)) { |
|
1734 err = "stack_move inconsistent with previous and current MethodType vmslots"; |
|
1735 } else if (slots_pushed > 0) { |
|
1736 // verify stack_move against MethodHandlePushLimit |
|
1737 int prev_pushes = decode_MethodHandle_stack_pushes(target()); |
|
1738 // do not blow the stack; use a Java-based adapter if this limit is exceeded |
|
1739 if (slots_pushed + prev_pushes > MethodHandlePushLimit) { |
|
1740 err = "adapter pushes too many parameters"; |
|
1741 } |
|
1742 } |
|
1743 |
|
1744 // While we're at it, check that the stack motion decoder works: |
|
1745 DEBUG_ONLY(int prev_pushes = decode_MethodHandle_stack_pushes(target())); |
|
1746 DEBUG_ONLY(int this_pushes = decode_MethodHandle_stack_pushes(mh())); |
|
1747 assert(this_pushes == slots_pushed + prev_pushes, "AMH stack motion must be correct"); |
|
1748 } |
|
1749 |
|
1750 if (err == NULL && vminfo != 0) { |
|
1751 switch (ek) { |
|
1752 case _adapter_swap_args: |
|
1753 case _adapter_rot_args: |
|
1754 break; // OK |
|
1755 default: |
|
1756 err = "vminfo subfield is reserved to the JVM"; |
|
1757 } |
|
1758 } |
|
1759 |
|
1760 // Do additional ad hoc checks. |
|
1761 if (err == NULL) { |
|
1762 switch (ek) { |
|
1763 case _adapter_retype_only: |
|
1764 err = check_method_type_passthrough(src_mtype(), dst_mtype()); |
|
1765 break; |
|
1766 |
|
1767 case _adapter_check_cast: |
|
1768 { |
|
1769 // The actual value being checked must be a reference: |
|
1770 err = check_argument_type_change(java_dyn_MethodType::ptype(src_mtype(), argnum), |
|
1771 object_java_mirror(), argnum); |
|
1772 if (err != NULL) break; |
|
1773 |
|
1774 // The output of the cast must fit with the destination argument: |
|
1775 Handle cast_class = argument; |
|
1776 err = check_method_type_conversion(src_mtype(), |
|
1777 argnum, cast_class(), |
|
1778 dst_mtype()); |
|
1779 } |
|
1780 break; |
|
1781 |
|
1782 // %%% TO DO: continue in remaining cases to verify src/dst_mtype if VerifyMethodHandles |
|
1783 } |
|
1784 } |
|
1785 |
|
1786 if (err != NULL) { |
|
1787 throw_InternalError_for_bad_conversion(conversion, err, THREAD); |
|
1788 return; |
|
1789 } |
|
1790 |
|
1791 } |
|
1792 |
|
1793 void MethodHandles::init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS) { |
|
1794 oop argument = sun_dyn_AdapterMethodHandle::argument(mh()); |
|
1795 int argslot = sun_dyn_AdapterMethodHandle::vmargslot(mh()); |
|
1796 jint conversion = sun_dyn_AdapterMethodHandle::conversion(mh()); |
|
1797 jint conv_op = adapter_conversion_op(conversion); |
|
1798 |
|
1799 // adjust the adapter code to the internal EntryKind enumeration: |
|
1800 EntryKind ek_orig = adapter_entry_kind(conv_op); |
|
1801 EntryKind ek_opt = ek_orig; // may be optimized |
|
1802 |
|
1803 // Finalize the vmtarget field (Java initialized it to null). |
|
1804 if (!java_dyn_MethodHandle::is_instance(target())) { |
|
1805 throw_InternalError_for_bad_conversion(conversion, "bad target", THREAD); |
|
1806 return; |
|
1807 } |
|
1808 sun_dyn_AdapterMethodHandle::set_vmtarget(mh(), target()); |
|
1809 |
|
1810 if (VerifyMethodHandles) { |
|
1811 verify_AdapterMethodHandle(mh, argnum, CHECK); |
|
1812 } |
|
1813 |
|
1814 int stack_move = adapter_conversion_stack_move(conversion); |
|
1815 BasicType src = adapter_conversion_src_type(conversion); |
|
1816 BasicType dest = adapter_conversion_dest_type(conversion); |
|
1817 int vminfo = adapter_conversion_vminfo(conversion); // should be zero |
|
1818 |
|
1819 const char* err = NULL; |
|
1820 |
|
1821 // Now it's time to finish the case analysis and pick a MethodHandleEntry. |
|
1822 switch (ek_orig) { |
|
1823 case _adapter_retype_only: |
|
1824 case _adapter_check_cast: |
|
1825 case _adapter_dup_args: |
|
1826 case _adapter_drop_args: |
|
1827 // these work fine via general case code |
|
1828 break; |
|
1829 |
|
1830 case _adapter_prim_to_prim: |
|
1831 { |
|
1832 // Non-subword cases are {int,float,long,double} -> {int,float,long,double}. |
|
1833 // And, the {float,double} -> {int,long} cases must be handled by Java. |
|
1834 switch (type2size[src] *4+ type2size[dest]) { |
|
1835 case 1 *4+ 1: |
|
1836 assert(src == T_INT || is_subword_type(src), "source is not float"); |
|
1837 // Subword-related cases are int -> {boolean,byte,char,short}. |
|
1838 ek_opt = _adapter_opt_i2i; |
|
1839 vminfo = adapter_subword_vminfo(dest); |
|
1840 break; |
|
1841 case 2 *4+ 1: |
|
1842 if (src == T_LONG && (dest == T_INT || is_subword_type(dest))) { |
|
1843 ek_opt = _adapter_opt_l2i; |
|
1844 vminfo = adapter_subword_vminfo(dest); |
|
1845 } else if (src == T_DOUBLE && dest == T_FLOAT) { |
|
1846 ek_opt = _adapter_opt_d2f; |
|
1847 } else { |
|
1848 assert(false, ""); |
|
1849 } |
|
1850 break; |
|
1851 case 1 *4+ 2: |
|
1852 if (src == T_INT && dest == T_LONG) { |
|
1853 ek_opt = _adapter_opt_i2l; |
|
1854 } else if (src == T_FLOAT && dest == T_DOUBLE) { |
|
1855 ek_opt = _adapter_opt_f2d; |
|
1856 } else { |
|
1857 assert(false, ""); |
|
1858 } |
|
1859 break; |
|
1860 default: |
|
1861 assert(false, ""); |
|
1862 break; |
|
1863 } |
|
1864 } |
|
1865 break; |
|
1866 |
|
1867 case _adapter_ref_to_prim: |
|
1868 { |
|
1869 switch (type2size[dest]) { |
|
1870 case 1: |
|
1871 ek_opt = _adapter_opt_unboxi; |
|
1872 vminfo = adapter_subword_vminfo(dest); |
|
1873 break; |
|
1874 case 2: |
|
1875 ek_opt = _adapter_opt_unboxl; |
|
1876 break; |
|
1877 default: |
|
1878 assert(false, ""); |
|
1879 break; |
|
1880 } |
|
1881 } |
|
1882 break; |
|
1883 |
|
1884 case _adapter_prim_to_ref: |
|
1885 goto throw_not_impl; // allocates, hence could block |
|
1886 |
|
1887 case _adapter_swap_args: |
|
1888 case _adapter_rot_args: |
|
1889 { |
|
1890 int swap_slots = type2size[src]; |
|
1891 oop mtype = sun_dyn_AdapterMethodHandle::type(mh()); |
|
1892 int slot_limit = sun_dyn_AdapterMethodHandle::vmslots(mtype); |
|
1893 int src_slot = argslot; |
|
1894 int dest_slot = vminfo; |
|
1895 int rotate = (ek_orig == _adapter_swap_args) ? 0 : (src_slot > dest_slot) ? 1 : -1; |
|
1896 switch (swap_slots) { |
|
1897 case 1: |
|
1898 ek_opt = (!rotate ? _adapter_opt_swap_1 : |
|
1899 rotate > 0 ? _adapter_opt_rot_1_up : _adapter_opt_rot_1_down); |
|
1900 break; |
|
1901 case 2: |
|
1902 ek_opt = (!rotate ? _adapter_opt_swap_2 : |
|
1903 rotate > 0 ? _adapter_opt_rot_2_up : _adapter_opt_rot_2_down); |
|
1904 break; |
|
1905 default: |
|
1906 assert(false, ""); |
|
1907 break; |
|
1908 } |
|
1909 } |
|
1910 break; |
|
1911 |
|
1912 case _adapter_collect_args: |
|
1913 goto throw_not_impl; // allocates, hence could block |
|
1914 |
|
1915 case _adapter_spread_args: |
|
1916 { |
|
1917 // vminfo will be the required length of the array |
|
1918 int slots_pushed = stack_move / stack_move_unit(); |
|
1919 int array_size = slots_pushed + 1; |
|
1920 assert(array_size >= 0, ""); |
|
1921 vminfo = array_size; |
|
1922 switch (array_size) { |
|
1923 case 0: ek_opt = _adapter_opt_spread_0; break; |
|
1924 case 1: ek_opt = _adapter_opt_spread_1; break; |
|
1925 default: ek_opt = _adapter_opt_spread_more; break; |
|
1926 } |
|
1927 if ((vminfo & CONV_VMINFO_MASK) != vminfo) |
|
1928 goto throw_not_impl; // overflow |
|
1929 } |
|
1930 break; |
|
1931 |
|
1932 case _adapter_flyby: |
|
1933 case _adapter_ricochet: |
|
1934 goto throw_not_impl; // runs Java code, hence could block |
|
1935 |
|
1936 default: |
|
1937 // should have failed much earlier; must be a missing case here |
|
1938 assert(false, "incomplete switch"); |
|
1939 // and fall through: |
|
1940 |
|
1941 throw_not_impl: |
|
1942 // FIXME: these adapters are NYI |
|
1943 err = "adapter not yet implemented in the JVM"; |
|
1944 break; |
|
1945 } |
|
1946 |
|
1947 if (err != NULL) { |
|
1948 throw_InternalError_for_bad_conversion(conversion, err, THREAD); |
|
1949 return; |
|
1950 } |
|
1951 |
|
1952 // Rebuild the conversion value; maybe parts of it were changed. |
|
1953 jint new_conversion = adapter_conversion(conv_op, src, dest, stack_move, vminfo); |
|
1954 |
|
1955 // Finalize the conversion field. (Note that it is final to Java code.) |
|
1956 sun_dyn_AdapterMethodHandle::set_conversion(mh(), new_conversion); |
|
1957 |
|
1958 // Done! |
|
1959 java_dyn_MethodHandle::set_vmentry(mh(), entry(ek_opt)); |
|
1960 |
|
1961 // There should be enough memory barriers on exit from native methods |
|
1962 // to ensure that the MH is fully initialized to all threads before |
|
1963 // Java code can publish it in global data structures. |
|
1964 } |
|
1965 |
|
1966 // |
|
1967 // Here are the native methods on sun.dyn.MethodHandleImpl. |
|
1968 // They are the private interface between this JVM and the HotSpot-specific |
|
1969 // Java code that implements JSR 292 method handles. |
|
1970 // |
|
1971 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way |
|
1972 // that intrinsic (non-JNI) native methods are defined in HotSpot. |
|
1973 // |
|
1974 |
|
1975 // direct method handles for invokestatic or invokespecial |
|
1976 // void init(DirectMethodHandle self, MemberName ref, boolean doDispatch, Class<?> caller); |
|
1977 JVM_ENTRY(void, MHI_init_DMH(JNIEnv *env, jobject igcls, jobject mh_jh, |
|
1978 jobject target_jh, jboolean do_dispatch, jobject caller_jh)) { |
|
1979 ResourceMark rm; // for error messages |
|
1980 |
|
1981 // This is the guy we are initializing: |
|
1982 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
1983 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); |
|
1984 |
|
1985 // Early returns out of this method leave the DMH in an unfinished state. |
|
1986 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); |
|
1987 |
|
1988 // which method are we really talking about? |
|
1989 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
1990 oop target_oop = JNIHandles::resolve_non_null(target_jh); |
|
1991 if (sun_dyn_MemberName::is_instance(target_oop) && |
|
1992 sun_dyn_MemberName::vmindex(target_oop) == VM_INDEX_UNINITIALIZED) { |
|
1993 Handle mname(THREAD, target_oop); |
|
1994 MethodHandles::resolve_MemberName(mname, CHECK); |
|
1995 target_oop = mname(); // in case of GC |
|
1996 } |
|
1997 |
|
1998 int decode_flags = 0; klassOop receiver_limit = NULL; |
|
1999 methodHandle m(THREAD, |
|
2000 MethodHandles::decode_method(target_oop, |
|
2001 receiver_limit, decode_flags)); |
|
2002 if (m.is_null()) { THROW_MSG(vmSymbols::java_lang_InternalError(), "no such method"); } |
|
2003 |
|
2004 // The trusted Java code that calls this method should already have performed |
|
2005 // access checks on behalf of the given caller. But, we can verify this. |
|
2006 if (VerifyMethodHandles && caller_jh != NULL) { |
|
2007 KlassHandle caller(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); |
|
2008 // If this were a bytecode, the first access check would be against |
|
2009 // the "reference class" mentioned in the CONSTANT_Methodref. |
|
2010 // For that class, we use the defining class of m, |
|
2011 // or a more specific receiver limit if available. |
|
2012 klassOop reference_klass = m->method_holder(); // OK approximation |
|
2013 if (receiver_limit != NULL && receiver_limit != reference_klass) { |
|
2014 if (!Klass::cast(receiver_limit)->is_subtype_of(reference_klass)) |
|
2015 THROW_MSG(vmSymbols::java_lang_InternalError(), "receiver limit out of bounds"); // Java code bug |
|
2016 reference_klass = receiver_limit; |
|
2017 } |
|
2018 // Emulate LinkResolver::check_klass_accessability. |
|
2019 if (!Reflection::verify_class_access(caller->as_klassOop(), |
|
2020 reference_klass, |
|
2021 true)) { |
|
2022 THROW_MSG(vmSymbols::java_lang_InternalError(), Klass::cast(m->method_holder())->external_name()); |
|
2023 } |
|
2024 // If there were a bytecode, the next step would be to lookup the method |
|
2025 // in the reference class, then then check the method's access bits. |
|
2026 // Emulate LinkResolver::check_method_accessability. |
|
2027 klassOop resolved_klass = m->method_holder(); |
|
2028 if (!Reflection::verify_field_access(caller->as_klassOop(), |
|
2029 resolved_klass, reference_klass, |
|
2030 m->access_flags(), |
|
2031 true)) { |
|
2032 // %%% following cutout belongs in Reflection::verify_field_access? |
|
2033 bool same_pm = Reflection::is_same_package_member(caller->as_klassOop(), |
|
2034 reference_klass, THREAD); |
|
2035 if (!same_pm) { |
|
2036 THROW_MSG(vmSymbols::java_lang_InternalError(), m->name_and_sig_as_C_string()); |
|
2037 } |
|
2038 } |
|
2039 } |
|
2040 |
|
2041 MethodHandles::init_DirectMethodHandle(mh, m, (do_dispatch != JNI_FALSE), CHECK); |
|
2042 } |
|
2043 JVM_END |
|
2044 |
|
2045 // bound method handles |
|
2046 JVM_ENTRY(void, MHI_init_BMH(JNIEnv *env, jobject igcls, jobject mh_jh, |
|
2047 jobject target_jh, int argnum)) { |
|
2048 ResourceMark rm; // for error messages |
|
2049 |
|
2050 // This is the guy we are initializing: |
|
2051 if (mh_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
2052 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); |
|
2053 |
|
2054 // Early returns out of this method leave the BMH in an unfinished state. |
|
2055 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); |
|
2056 |
|
2057 if (target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
2058 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); |
|
2059 |
|
2060 if (!java_dyn_MethodHandle::is_instance(target())) { |
|
2061 // Target object is a reflective method. (%%% Do we need this alternate path?) |
|
2062 Untested("init_BMH of non-MH"); |
|
2063 if (argnum != 0) { THROW(vmSymbols::java_lang_InternalError()); } |
|
2064 int decode_flags = 0; klassOop receiver_limit_oop = NULL; |
|
2065 methodHandle m(THREAD, |
|
2066 MethodHandles::decode_method(target(), |
|
2067 receiver_limit_oop, |
|
2068 decode_flags)); |
|
2069 KlassHandle receiver_limit(THREAD, receiver_limit_oop); |
|
2070 MethodHandles::init_BoundMethodHandle_with_receiver(mh, m, |
|
2071 receiver_limit, |
|
2072 decode_flags, |
|
2073 CHECK); |
|
2074 return; |
|
2075 } |
|
2076 |
|
2077 // Build a BMH on top of a DMH or another BMH: |
|
2078 MethodHandles::init_BoundMethodHandle(mh, target, argnum, CHECK); |
|
2079 } |
|
2080 JVM_END |
|
2081 |
|
2082 // adapter method handles |
|
2083 JVM_ENTRY(void, MHI_init_AMH(JNIEnv *env, jobject igcls, jobject mh_jh, |
|
2084 jobject target_jh, int argnum)) { |
|
2085 // This is the guy we are initializing: |
|
2086 if (mh_jh == NULL || target_jh == NULL) { |
|
2087 THROW(vmSymbols::java_lang_InternalError()); |
|
2088 } |
|
2089 Handle mh(THREAD, JNIHandles::resolve_non_null(mh_jh)); |
|
2090 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); |
|
2091 |
|
2092 // Early returns out of this method leave the AMH in an unfinished state. |
|
2093 assert(java_dyn_MethodHandle::vmentry(mh()) == NULL, "must be safely null"); |
|
2094 |
|
2095 MethodHandles::init_AdapterMethodHandle(mh, target, argnum, CHECK); |
|
2096 } |
|
2097 JVM_END |
|
2098 |
|
2099 // method type forms |
|
2100 JVM_ENTRY(void, MHI_init_MT(JNIEnv *env, jobject igcls, jobject erased_jh)) { |
|
2101 if (erased_jh == NULL) return; |
|
2102 if (TraceMethodHandles) { |
|
2103 tty->print("creating MethodType form "); |
|
2104 if (WizardMode || Verbose) { // Warning: this calls Java code on the MH! |
|
2105 // call Object.toString() |
|
2106 symbolOop name = vmSymbols::toString_name(), sig = vmSymbols::void_string_signature(); |
|
2107 JavaCallArguments args(Handle(THREAD, JNIHandles::resolve_non_null(erased_jh))); |
|
2108 JavaValue result(T_OBJECT); |
|
2109 JavaCalls::call_virtual(&result, SystemDictionary::object_klass(), name, sig, |
|
2110 &args, CHECK); |
|
2111 Handle str(THREAD, (oop)result.get_jobject()); |
|
2112 java_lang_String::print(str, tty); |
|
2113 } |
|
2114 tty->cr(); |
|
2115 } |
|
2116 } |
|
2117 JVM_END |
|
2118 |
|
2119 // debugging and reflection |
|
2120 JVM_ENTRY(jobject, MHI_getTarget(JNIEnv *env, jobject igcls, jobject mh_jh, jint format)) { |
|
2121 Handle mh(THREAD, JNIHandles::resolve(mh_jh)); |
|
2122 if (!java_dyn_MethodHandle::is_instance(mh())) { |
|
2123 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException()); |
|
2124 } |
|
2125 oop target = MethodHandles::encode_target(mh, format, CHECK_NULL); |
|
2126 return JNIHandles::make_local(THREAD, target); |
|
2127 } |
|
2128 JVM_END |
|
2129 |
|
2130 JVM_ENTRY(jint, MHI_getConstant(JNIEnv *env, jobject igcls, jint which)) { |
|
2131 switch (which) { |
|
2132 case MethodHandles::GC_JVM_PUSH_LIMIT: |
|
2133 guarantee(MethodHandlePushLimit >= 2 && MethodHandlePushLimit <= 0xFF, |
|
2134 "MethodHandlePushLimit parameter must be in valid range"); |
|
2135 return MethodHandlePushLimit; |
|
2136 case MethodHandles::GC_JVM_STACK_MOVE_LIMIT: |
|
2137 // return number of words per slot, signed according to stack direction |
|
2138 return MethodHandles::stack_move_unit(); |
|
2139 } |
|
2140 return 0; |
|
2141 } |
|
2142 JVM_END |
|
2143 |
|
2144 #ifndef PRODUCT |
|
2145 #define EACH_NAMED_CON(template) \ |
|
2146 template(MethodHandles,GC_JVM_PUSH_LIMIT) \ |
|
2147 template(MethodHandles,GC_JVM_STACK_MOVE_LIMIT) \ |
|
2148 template(MethodHandles,ETF_HANDLE_OR_METHOD_NAME) \ |
|
2149 template(MethodHandles,ETF_DIRECT_HANDLE) \ |
|
2150 template(MethodHandles,ETF_METHOD_NAME) \ |
|
2151 template(MethodHandles,ETF_REFLECT_METHOD) \ |
|
2152 template(sun_dyn_MemberName,MN_IS_METHOD) \ |
|
2153 template(sun_dyn_MemberName,MN_IS_CONSTRUCTOR) \ |
|
2154 template(sun_dyn_MemberName,MN_IS_FIELD) \ |
|
2155 template(sun_dyn_MemberName,MN_IS_TYPE) \ |
|
2156 template(sun_dyn_MemberName,MN_SEARCH_SUPERCLASSES) \ |
|
2157 template(sun_dyn_MemberName,MN_SEARCH_INTERFACES) \ |
|
2158 template(sun_dyn_MemberName,VM_INDEX_UNINITIALIZED) \ |
|
2159 template(sun_dyn_AdapterMethodHandle,OP_RETYPE_ONLY) \ |
|
2160 template(sun_dyn_AdapterMethodHandle,OP_CHECK_CAST) \ |
|
2161 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_PRIM) \ |
|
2162 template(sun_dyn_AdapterMethodHandle,OP_REF_TO_PRIM) \ |
|
2163 template(sun_dyn_AdapterMethodHandle,OP_PRIM_TO_REF) \ |
|
2164 template(sun_dyn_AdapterMethodHandle,OP_SWAP_ARGS) \ |
|
2165 template(sun_dyn_AdapterMethodHandle,OP_ROT_ARGS) \ |
|
2166 template(sun_dyn_AdapterMethodHandle,OP_DUP_ARGS) \ |
|
2167 template(sun_dyn_AdapterMethodHandle,OP_DROP_ARGS) \ |
|
2168 template(sun_dyn_AdapterMethodHandle,OP_COLLECT_ARGS) \ |
|
2169 template(sun_dyn_AdapterMethodHandle,OP_SPREAD_ARGS) \ |
|
2170 template(sun_dyn_AdapterMethodHandle,OP_FLYBY) \ |
|
2171 template(sun_dyn_AdapterMethodHandle,OP_RICOCHET) \ |
|
2172 template(sun_dyn_AdapterMethodHandle,CONV_OP_LIMIT) \ |
|
2173 template(sun_dyn_AdapterMethodHandle,CONV_OP_MASK) \ |
|
2174 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_MASK) \ |
|
2175 template(sun_dyn_AdapterMethodHandle,CONV_VMINFO_SHIFT) \ |
|
2176 template(sun_dyn_AdapterMethodHandle,CONV_OP_SHIFT) \ |
|
2177 template(sun_dyn_AdapterMethodHandle,CONV_DEST_TYPE_SHIFT) \ |
|
2178 template(sun_dyn_AdapterMethodHandle,CONV_SRC_TYPE_SHIFT) \ |
|
2179 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_SHIFT) \ |
|
2180 template(sun_dyn_AdapterMethodHandle,CONV_STACK_MOVE_MASK) \ |
|
2181 /*end*/ |
|
2182 |
|
2183 #define ONE_PLUS(scope,value) 1+ |
|
2184 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS) 0; |
|
2185 #define VALUE_COMMA(scope,value) scope::value, |
|
2186 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA) 0 }; |
|
2187 #define STRING_NULL(scope,value) #value "\0" |
|
2188 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL) }; |
|
2189 |
|
2190 #undef ONE_PLUS |
|
2191 #undef VALUE_COMMA |
|
2192 #undef STRING_NULL |
|
2193 #undef EACH_NAMED_CON |
|
2194 #endif |
|
2195 |
|
2196 JVM_ENTRY(jint, MHI_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { |
|
2197 #ifndef PRODUCT |
|
2198 if (which >= 0 && which < con_value_count) { |
|
2199 int con = con_values[which]; |
|
2200 objArrayOop box = (objArrayOop) JNIHandles::resolve(box_jh); |
|
2201 if (box != NULL && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { |
|
2202 const char* str = &con_names[0]; |
|
2203 for (int i = 0; i < which; i++) |
|
2204 str += strlen(str) + 1; // skip name and null |
|
2205 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); |
|
2206 box->obj_at_put(0, name); |
|
2207 } |
|
2208 return con; |
|
2209 } |
|
2210 #endif |
|
2211 return 0; |
|
2212 } |
|
2213 JVM_END |
|
2214 |
|
2215 // void init(MemberName self, AccessibleObject ref) |
|
2216 JVM_ENTRY(void, MHI_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { |
|
2217 if (mname_jh == NULL || target_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
2218 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); |
|
2219 oop target_oop = JNIHandles::resolve_non_null(target_jh); |
|
2220 MethodHandles::init_MemberName(mname(), target_oop); |
|
2221 } |
|
2222 JVM_END |
|
2223 |
|
2224 // void expand(MemberName self) |
|
2225 JVM_ENTRY(void, MHI_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { |
|
2226 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
2227 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); |
|
2228 MethodHandles::expand_MemberName(mname, 0, CHECK); |
|
2229 } |
|
2230 JVM_END |
|
2231 |
|
2232 // void resolve(MemberName self, Class<?> caller) |
|
2233 JVM_ENTRY(void, MHI_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { |
|
2234 if (mname_jh == NULL) { THROW(vmSymbols::java_lang_InternalError()); } |
|
2235 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); |
|
2236 // %%% take caller into account! |
|
2237 MethodHandles::resolve_MemberName(mname, CHECK); |
|
2238 } |
|
2239 JVM_END |
|
2240 |
|
2241 // static native int getMembers(Class<?> defc, String matchName, String matchSig, |
|
2242 // int matchFlags, Class<?> caller, int skip, MemberName[] results); |
|
2243 JVM_ENTRY(jint, MHI_getMembers(JNIEnv *env, jobject igcls, |
|
2244 jclass clazz_jh, jstring name_jh, jstring sig_jh, |
|
2245 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { |
|
2246 if (clazz_jh == NULL || results_jh == NULL) return -1; |
|
2247 klassOop k_oop = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh)); |
|
2248 |
|
2249 objArrayOop results = (objArrayOop) JNIHandles::resolve(results_jh); |
|
2250 if (results == NULL || !results->is_objArray()) return -1; |
|
2251 |
|
2252 symbolOop name = NULL, sig = NULL; |
|
2253 if (name_jh != NULL) { |
|
2254 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); |
|
2255 if (name == NULL) return 0; // a match is not possible |
|
2256 } |
|
2257 if (sig_jh != NULL) { |
|
2258 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); |
|
2259 if (sig == NULL) return 0; // a match is not possible |
|
2260 } |
|
2261 |
|
2262 klassOop caller = NULL; |
|
2263 if (caller_jh != NULL) { |
|
2264 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); |
|
2265 if (!java_lang_Class::is_instance(caller_oop)) return -1; |
|
2266 caller = java_lang_Class::as_klassOop(caller_oop); |
|
2267 } |
|
2268 |
|
2269 if (name != NULL && sig != NULL && results != NULL) { |
|
2270 // try a direct resolve |
|
2271 // %%% TO DO |
|
2272 } |
|
2273 |
|
2274 int res = MethodHandles::find_MemberNames(k_oop, name, sig, mflags, |
|
2275 caller, skip, results); |
|
2276 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks |
|
2277 return res; |
|
2278 } |
|
2279 JVM_END |
|
2280 |
|
2281 |
|
2282 /// JVM_RegisterMethodHandleMethods |
|
2283 |
|
2284 #define ADR "J" |
|
2285 |
|
2286 #define LANG "Ljava/lang/" |
|
2287 #define JDYN "Ljava/dyn/" |
|
2288 #define IDYN "Lsun/dyn/" |
|
2289 |
|
2290 #define OBJ LANG"Object;" |
|
2291 #define CLS LANG"Class;" |
|
2292 #define STRG LANG"String;" |
|
2293 #define MT JDYN"MethodType;" |
|
2294 #define MH JDYN"MethodHandle;" |
|
2295 #define MHI IDYN"MethodHandleImpl;" |
|
2296 #define MEM IDYN"MemberName;" |
|
2297 #define AMH IDYN"AdapterMethodHandle;" |
|
2298 #define BMH IDYN"BoundMethodHandle;" |
|
2299 #define DMH IDYN"DirectMethodHandle;" |
|
2300 |
|
2301 #define CC (char*) /*cast a literal from (const char*)*/ |
|
2302 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) |
|
2303 |
|
2304 // These are the native methods on sun.dyn.MethodHandleNatives. |
|
2305 static JNINativeMethod methods[] = { |
|
2306 // void init(MemberName self, AccessibleObject ref) |
|
2307 {CC"init", CC"("AMH""MH"I)V", FN_PTR(MHI_init_AMH)}, |
|
2308 {CC"init", CC"("BMH""OBJ"I)V", FN_PTR(MHI_init_BMH)}, |
|
2309 {CC"init", CC"("DMH""OBJ"Z"CLS")V", FN_PTR(MHI_init_DMH)}, |
|
2310 {CC"init", CC"("MT")V", FN_PTR(MHI_init_MT)}, |
|
2311 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHI_init_Mem)}, |
|
2312 {CC"expand", CC"("MEM")V", FN_PTR(MHI_expand_Mem)}, |
|
2313 {CC"resolve", CC"("MEM""CLS")V", FN_PTR(MHI_resolve_Mem)}, |
|
2314 {CC"getTarget", CC"("MH"I)"OBJ, FN_PTR(MHI_getTarget)}, |
|
2315 {CC"getConstant", CC"(I)I", FN_PTR(MHI_getConstant)}, |
|
2316 // static native int getNamedCon(int which, Object[] name) |
|
2317 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHI_getNamedCon)}, |
|
2318 // static native int getMembers(Class<?> defc, String matchName, String matchSig, |
|
2319 // int matchFlags, Class<?> caller, int skip, MemberName[] results); |
|
2320 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHI_getMembers)} |
|
2321 }; |
|
2322 |
|
2323 |
|
2324 // This one function is exported, used by NativeLookup. |
|
2325 |
|
2326 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { |
|
2327 assert(MethodHandles::spot_check_entry_names(), "entry enum is OK"); |
|
2328 |
|
2329 if (!EnableMethodHandles) { |
|
2330 warning("JSR 292 method handles are disabled in this JVM. Use -XX:+EnableMethodHandles to enable."); |
|
2331 return; // bind nothing |
|
2332 } |
|
2333 |
|
2334 { |
|
2335 ThreadToNativeFromVM ttnfv(thread); |
|
2336 |
|
2337 int status = env->RegisterNatives(MHN_class, methods, sizeof(methods)/sizeof(JNINativeMethod)); |
|
2338 if (env->ExceptionOccurred()) { |
|
2339 MethodHandles::set_enabled(false); |
|
2340 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); |
|
2341 env->ExceptionClear(); |
|
2342 } else { |
|
2343 MethodHandles::set_enabled(true); |
|
2344 } |
|
2345 } |
|
2346 } |
|
2347 JVM_END |