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annotate src/share/vm/prims/methodHandleWalk.hpp @ 1133:aa62b9388fce

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6894206: JVM needs a way to traverse method handle structures Summary: We need a way to walk chained method handles in the JVM to call the right methods and to generate required bytecode adapters for the compilers. Reviewed-by: kvn
author twisti
date Mon, 04 Jan 2010 15:52:40 +0100
parents
children dd57230ba8fe
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1 /*
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2 * Copyright 2008-2010 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 // Low-level parser for method handle chains.
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26 class MethodHandleChain : StackObj {
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27 public:
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28 typedef MethodHandles::EntryKind EntryKind;
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29
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30 private:
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31 Handle _root; // original target
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32 Handle _method_handle; // current target
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33 bool _is_last; // final guy in chain
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34 bool _is_bound; // has a bound argument
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35 BasicType _arg_type; // if is_bound, the bound argument type
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36 int _arg_slot; // if is_bound or is_adapter, affected argument slot
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37 jint _conversion; // conversion field of AMH or -1
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38 methodHandle _last_method; // if is_last, which method we target
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39 Bytecodes::Code _last_invoke; // if is_last, type of invoke
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40 const char* _lose_message; // saved argument to lose()
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41
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42 void set_method_handle(Handle target, TRAPS);
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43 void set_last_method(oop target, TRAPS);
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44 static BasicType compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS);
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45
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46 oop MethodHandle_type_oop() { return java_dyn_MethodHandle::type(method_handle_oop()); }
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47 oop MethodHandle_vmtarget_oop() { return java_dyn_MethodHandle::vmtarget(method_handle_oop()); }
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48 int MethodHandle_vmslots() { return java_dyn_MethodHandle::vmslots(method_handle_oop()); }
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49 int DirectMethodHandle_vmindex() { return sun_dyn_DirectMethodHandle::vmindex(method_handle_oop()); }
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50 oop BoundMethodHandle_argument_oop() { return sun_dyn_BoundMethodHandle::argument(method_handle_oop()); }
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51 int BoundMethodHandle_vmargslot() { return sun_dyn_BoundMethodHandle::vmargslot(method_handle_oop()); }
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52 int AdapterMethodHandle_conversion() { return sun_dyn_AdapterMethodHandle::conversion(method_handle_oop()); }
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53
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54 public:
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55 MethodHandleChain(Handle root, TRAPS)
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56 : _root(root)
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57 { set_method_handle(root, THREAD); }
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58
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59 bool is_adapter() { return _conversion != -1; }
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60 bool is_bound() { return _is_bound; }
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61 bool is_last() { return _is_last; }
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62
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63 void next(TRAPS) {
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64 assert(!is_last(), "");
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65 set_method_handle(MethodHandle_vmtarget_oop(), THREAD);
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66 }
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67
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68 Handle method_handle() { return _method_handle; }
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69 oop method_handle_oop() { return _method_handle(); }
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70 oop method_type_oop() { return MethodHandle_type_oop(); }
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71
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72 jint adapter_conversion() { assert(is_adapter(), ""); return _conversion; }
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73 int adapter_conversion_op() { return MethodHandles::adapter_conversion_op(adapter_conversion()); }
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74 BasicType adapter_conversion_src_type()
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75 { return MethodHandles::adapter_conversion_src_type(adapter_conversion()); }
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76 BasicType adapter_conversion_dest_type()
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77 { return MethodHandles::adapter_conversion_dest_type(adapter_conversion()); }
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78 int adapter_conversion_stack_move()
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79 { return MethodHandles::adapter_conversion_stack_move(adapter_conversion()); }
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80 int adapter_conversion_stack_pushes()
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81 { return adapter_conversion_stack_move() / MethodHandles::stack_move_unit(); }
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82 int adapter_conversion_vminfo()
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83 { return MethodHandles::adapter_conversion_vminfo(adapter_conversion()); }
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84 int adapter_arg_slot() { assert(is_adapter(), ""); return _arg_slot; }
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85 oop adapter_arg_oop() { assert(is_adapter(), ""); return BoundMethodHandle_argument_oop(); }
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86
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87 BasicType bound_arg_type() { assert(is_bound(), ""); return _arg_type; }
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88 int bound_arg_slot() { assert(is_bound(), ""); return _arg_slot; }
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89 oop bound_arg_oop() { assert(is_bound(), ""); return BoundMethodHandle_argument_oop(); }
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90
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91 methodOop last_method_oop() { assert(is_last(), ""); return _last_method(); }
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92 Bytecodes::Code last_invoke_code() { assert(is_last(), ""); return _last_invoke; }
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93
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94 void lose(const char* msg, TRAPS);
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95 const char* lose_message() { return _lose_message; }
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96 };
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97
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98
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99 // Structure walker for method handles.
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100 // Does abstract interpretation on top of low-level parsing.
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101 // You supply the tokens shuffled by the abstract interpretation.
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102 class MethodHandleWalker : StackObj {
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103 public:
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104 struct _ArgToken { }; // dummy struct
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105 typedef _ArgToken* ArgToken;
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106
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107 // Abstract interpretation state:
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108 struct SlotState {
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109 BasicType _type;
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110 ArgToken _arg;
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111 SlotState() : _type(), _arg() {}
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112 };
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113 static SlotState make_state(BasicType type, ArgToken arg) {
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114 SlotState ss;
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115 ss._type = type; ss._arg = arg;
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116 return ss;
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117 }
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118
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119 private:
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120 MethodHandleChain _chain;
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121
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122 GrowableArray<SlotState> _outgoing; // current outgoing parameter slots
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123 int _outgoing_argc; // # non-empty outgoing slots
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124
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125 // Replace a value of type old_type at slot (and maybe slot+1) with the new value.
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126 // If old_type != T_VOID, remove the old argument at that point.
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127 // If new_type != T_VOID, insert the new argument at that point.
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128 // Insert or delete a second empty slot as needed.
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129 void change_argument(BasicType old_type, int slot, BasicType new_type, ArgToken new_arg);
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130
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131 SlotState* slot_state(int slot) {
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132 if (slot < 0 || slot >= _outgoing.length())
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133 return NULL;
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134 return _outgoing.adr_at(slot);
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135 }
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136 BasicType slot_type(int slot) {
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137 SlotState* ss = slot_state(slot);
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138 if (ss == NULL)
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139 return T_ILLEGAL;
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140 return ss->_type;
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141 }
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142 bool slot_has_argument(int slot) {
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143 return slot_type(slot) < T_VOID;
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144 }
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145
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146 #ifdef ASSERT
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147 int argument_count_slow();
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148 #endif
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149
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150 // Return a bytecode for converting src to dest, if one exists.
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151 Bytecodes::Code conversion_code(BasicType src, BasicType dest);
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152
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153 void walk_incoming_state(TRAPS);
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154
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155 public:
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156 MethodHandleWalker(Handle root, TRAPS)
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157 : _chain(root, THREAD),
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158 _outgoing(THREAD, 10),
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159 _outgoing_argc(0)
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160 { }
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161
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162 MethodHandleChain& chain() { return _chain; }
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163
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164 // plug-in abstract interpretation steps:
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165 virtual ArgToken make_parameter( BasicType type, klassOop tk, int argnum, TRAPS ) = 0;
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166 virtual ArgToken make_prim_constant( BasicType type, jvalue* con, TRAPS ) = 0;
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167 virtual ArgToken make_oop_constant( oop con, TRAPS ) = 0;
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168 virtual ArgToken make_conversion( BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS ) = 0;
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169 virtual ArgToken make_fetch( BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS ) = 0;
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170 virtual ArgToken make_invoke( methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS ) = 0;
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171
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172 // For make_invoke, the methodOop can be NULL if the intrinsic ID
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173 // is something other than vmIntrinsics::_none.
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174
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175 // and in case anyone cares to related the previous actions to the chain:
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176 virtual void set_method_handle(oop mh) { }
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177
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178 void lose(const char* msg, TRAPS) { chain().lose(msg, THREAD); }
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179 const char* lose_message() { return chain().lose_message(); }
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180
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181 ArgToken walk(TRAPS);
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182 };
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183
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184
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185 // An abstract interpreter for method handle chains.
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186 // Produces an account of the semantics of a chain, in terms of a static IR.
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187 // The IR happens to be JVM bytecodes.
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188 class MethodHandleCompiler : public MethodHandleWalker {
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189 private:
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190 Thread* _thread;
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191
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192 struct PrimCon {
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193 BasicType _type;
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194 jvalue _value;
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195 };
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196
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197 // Accumulated compiler state:
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198 stringStream _bytes;
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199 GrowableArray<Handle> _constant_oops;
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200 GrowableArray<PrimCon*> _constant_prims;
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201 int _max_stack;
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202 int _num_params;
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203 int _max_locals;
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204 int _name_index;
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205 int _signature_index;
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206
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207 // Stack values:
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208 enum TokenType {
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209 tt_void,
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210 tt_parameter,
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211 tt_temporary,
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212 tt_constant
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213 };
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214
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215 ArgToken make_stack_value(TokenType tt, BasicType type, int id) {
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216 return ArgToken( ((intptr_t)id << 8) | ((intptr_t)type << 4) | (intptr_t)tt );
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217 }
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218
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219 public:
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220 virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
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221 return make_stack_value(tt_parameter, type, argnum);
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222 }
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223 virtual ArgToken make_oop_constant(oop con, TRAPS) {
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224 return make_stack_value(tt_constant, T_OBJECT, find_oop_constant(con));
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225 }
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226 virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
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227 return make_stack_value(tt_constant, type, find_prim_constant(type, con));
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228 }
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229 virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS);
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230 virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS);
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231 virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS);
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232
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233 int find_oop_constant(oop con);
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234 int find_prim_constant(BasicType type, jvalue* con);
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235
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236 public:
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237 MethodHandleCompiler(Handle root, TRAPS)
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238 : MethodHandleWalker(root, THREAD),
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239 _thread(THREAD),
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240 _bytes(50),
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241 _constant_oops(THREAD, 10),
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242 _constant_prims(THREAD, 10),
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243 _max_stack(0), _max_locals(0),
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244 _name_index(0), _signature_index(0)
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245 { }
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246 const char* bytes() { return _bytes.as_string(); }
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247 int constant_length() { return _constant_oops.length(); }
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248 int max_stack() { return _max_stack; }
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249 int max_locals() { return _max_locals; }
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250 int name_index() { return _name_index; }
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251 int signature_index() { return _signature_index; }
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252 symbolHandle name() { return symbolHandle(_thread, (symbolOop)constant_oop_at(_name_index)()); }
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253 symbolHandle signature() { return symbolHandle(_thread, (symbolOop)constant_oop_at(_signature_index)()); }
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254
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255 bool constant_is_oop_at(int i) {
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256 return (_constant_prims.at(i) == NULL);
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257 }
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258 Handle constant_oop_at(int i) {
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259 assert(constant_is_oop_at(i), "");
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260 return _constant_oops.at(i);
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261 }
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262 PrimCon* constant_prim_at(int i) {
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263 assert(!constant_is_oop_at(i), "");
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264 return _constant_prims.at(i);
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265 }
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266
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267 // Compile the given MH chain into bytecode.
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268 void compile(TRAPS);
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269 };