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710
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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 class MacroAssembler;
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26 class Label;
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27 class MethodHandleEntry;
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28
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29 class MethodHandles: AllStatic {
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30 // JVM support for MethodHandle, MethodType, and related types
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31 // in java.dyn and java.dyn.hotspot.
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32 // See also javaClasses for layouts java_dyn_Method{Handle,Type,Type::Form}.
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33 public:
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34 enum EntryKind {
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35 _check_mtype, // how a caller calls a MH
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36 _wrong_method_type, // what happens when there is a type mismatch
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37 _invokestatic_mh, // how a MH emulates invokestatic
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38 _invokespecial_mh, // ditto for the other invokes...
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39 _invokevirtual_mh,
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40 _invokeinterface_mh,
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41 _bound_ref_mh, // reference argument is bound
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42 _bound_int_mh, // int argument is bound (via an Integer or Float)
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43 _bound_long_mh, // long argument is bound (via a Long or Double)
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44 _bound_ref_direct_mh, // same as above, with direct linkage to methodOop
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45 _bound_int_direct_mh,
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46 _bound_long_direct_mh,
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47
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48 _adapter_mh_first, // adapter sequence goes here...
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49 _adapter_retype_only = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY,
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50 _adapter_check_cast = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_CHECK_CAST,
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51 _adapter_prim_to_prim = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM,
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52 _adapter_ref_to_prim = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM,
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53 _adapter_prim_to_ref = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF,
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54 _adapter_swap_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS,
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55 _adapter_rot_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_ROT_ARGS,
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56 _adapter_dup_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DUP_ARGS,
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57 _adapter_drop_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DROP_ARGS,
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58 _adapter_collect_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_COLLECT_ARGS,
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59 _adapter_spread_args = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS,
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60 _adapter_flyby = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_FLYBY,
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61 _adapter_ricochet = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RICOCHET,
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62 _adapter_mh_last = _adapter_mh_first + sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT - 1,
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63
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64 // Optimized adapter types
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65
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66 // argument list reordering
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67 _adapter_opt_swap_1,
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68 _adapter_opt_swap_2,
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69 _adapter_opt_rot_1_up,
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70 _adapter_opt_rot_1_down,
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71 _adapter_opt_rot_2_up,
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72 _adapter_opt_rot_2_down,
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73 // primitive single to single:
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74 _adapter_opt_i2i, // i2c, i2z, i2b, i2s
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75 // primitive double to single:
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76 _adapter_opt_l2i,
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77 _adapter_opt_d2f,
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78 // primitive single to double:
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79 _adapter_opt_i2l,
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80 _adapter_opt_f2d,
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81 // conversion between floating point and integer type is handled by Java
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82
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83 // reference to primitive:
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84 _adapter_opt_unboxi,
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85 _adapter_opt_unboxl,
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86
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87 // spreading (array length cases 0, 1, >=2)
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88 _adapter_opt_spread_0,
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89 _adapter_opt_spread_1,
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90 _adapter_opt_spread_more,
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91
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92 _EK_LIMIT,
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93 _EK_FIRST = 0
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94 };
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95
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96 public:
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97 static bool enabled() { return _enabled; }
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98 static void set_enabled(bool z);
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99
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100 private:
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101 enum { // import sun_dyn_AdapterMethodHandle::CONV_OP_*
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102 CONV_OP_LIMIT = sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT,
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103 CONV_OP_MASK = sun_dyn_AdapterMethodHandle::CONV_OP_MASK,
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104 CONV_VMINFO_MASK = sun_dyn_AdapterMethodHandle::CONV_VMINFO_MASK,
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105 CONV_VMINFO_SHIFT = sun_dyn_AdapterMethodHandle::CONV_VMINFO_SHIFT,
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106 CONV_OP_SHIFT = sun_dyn_AdapterMethodHandle::CONV_OP_SHIFT,
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107 CONV_DEST_TYPE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_DEST_TYPE_SHIFT,
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108 CONV_SRC_TYPE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_SRC_TYPE_SHIFT,
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109 CONV_STACK_MOVE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_SHIFT,
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110 CONV_STACK_MOVE_MASK = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_MASK
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111 };
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112
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113 static bool _enabled;
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114 static MethodHandleEntry* _entries[_EK_LIMIT];
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115 static const char* _entry_names[_EK_LIMIT+1];
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116 static bool ek_valid(EntryKind ek) { return (uint)ek < (uint)_EK_LIMIT; }
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117 static bool conv_op_valid(int op) { return (uint)op < (uint)CONV_OP_LIMIT; }
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118
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119 public:
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120 static bool have_entry(EntryKind ek) { return ek_valid(ek) && _entries[ek] != NULL; }
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121 static MethodHandleEntry* entry(EntryKind ek) { assert(ek_valid(ek), "initialized");
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122 return _entries[ek]; }
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123 static const char* entry_name(EntryKind ek) { assert(ek_valid(ek), "oob");
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124 return _entry_names[ek]; }
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125 static EntryKind adapter_entry_kind(int op) { assert(conv_op_valid(op), "oob");
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126 return EntryKind(_adapter_mh_first + op); }
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127
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128 static void init_entry(EntryKind ek, MethodHandleEntry* me) {
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129 assert(ek_valid(ek), "oob");
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130 assert(_entries[ek] == NULL, "no double initialization");
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131 _entries[ek] = me;
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132 }
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133
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134 static jint adapter_conversion(int conv_op, BasicType src, BasicType dest,
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135 int stack_move = 0, int vminfo = 0) {
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136 assert(conv_op_valid(conv_op), "oob");
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137 jint conv = ((conv_op << CONV_OP_SHIFT)
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138 | (src << CONV_SRC_TYPE_SHIFT)
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139 | (dest << CONV_DEST_TYPE_SHIFT)
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140 | (stack_move << CONV_STACK_MOVE_SHIFT)
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141 | (vminfo << CONV_VMINFO_SHIFT)
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142 );
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143 assert(adapter_conversion_op(conv) == conv_op, "decode conv_op");
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144 assert(adapter_conversion_src_type(conv) == src, "decode src");
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145 assert(adapter_conversion_dest_type(conv) == dest, "decode dest");
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146 assert(adapter_conversion_stack_move(conv) == stack_move, "decode stack_move");
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147 assert(adapter_conversion_vminfo(conv) == vminfo, "decode vminfo");
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148 return conv;
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149 }
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150 static int adapter_conversion_op(jint conv) {
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151 return ((conv >> CONV_OP_SHIFT) & 0xF);
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152 }
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153 static BasicType adapter_conversion_src_type(jint conv) {
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154 return (BasicType)((conv >> CONV_SRC_TYPE_SHIFT) & 0xF);
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155 }
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156 static BasicType adapter_conversion_dest_type(jint conv) {
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157 return (BasicType)((conv >> CONV_DEST_TYPE_SHIFT) & 0xF);
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158 }
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159 static int adapter_conversion_stack_move(jint conv) {
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160 return (conv >> CONV_STACK_MOVE_SHIFT);
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161 }
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162 static int adapter_conversion_vminfo(jint conv) {
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163 return (conv >> CONV_VMINFO_SHIFT) & CONV_VMINFO_MASK;
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164 }
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165
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166 // Offset in words that the interpreter stack pointer moves when an argument is pushed.
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167 // The stack_move value must always be a multiple of this.
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168 static int stack_move_unit() {
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169 return frame::interpreter_frame_expression_stack_direction() * Interpreter::stackElementWords();
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170 }
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171
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172 enum { CONV_VMINFO_SIGN_FLAG = 0x80 };
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173 static int adapter_subword_vminfo(BasicType dest) {
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174 if (dest == T_BOOLEAN) return (BitsPerInt - 1);
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175 if (dest == T_CHAR) return (BitsPerInt - 16);
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176 if (dest == T_BYTE) return (BitsPerInt - 8) | CONV_VMINFO_SIGN_FLAG;
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177 if (dest == T_SHORT) return (BitsPerInt - 16) | CONV_VMINFO_SIGN_FLAG;
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178 return 0; // case T_INT
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179 }
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180 // Here is the transformation the i2i adapter must perform:
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181 static int truncate_subword_from_vminfo(jint value, int vminfo) {
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182 jint tem = value << vminfo;
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183 if ((vminfo & CONV_VMINFO_SIGN_FLAG) != 0) {
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184 return (jint)tem >> vminfo;
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185 } else {
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186 return (juint)tem >> vminfo;
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187 }
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188 }
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189
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190 static inline address from_compiled_entry(EntryKind ek);
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191 static inline address from_interpreted_entry(EntryKind ek);
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192
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193 // helpers for decode_method.
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194 static methodOop decode_methodOop(methodOop m, int& decode_flags_result);
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195 static methodOop decode_vmtarget(oop vmtarget, int vmindex, oop mtype, klassOop& receiver_limit_result, int& decode_flags_result);
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196 static methodOop decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result);
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197 static methodOop decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
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198 static methodOop decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
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199 static methodOop decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
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200 static methodOop decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
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201
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202 // Find out how many stack slots an mh pushes or pops.
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203 // The result is *not* reported as a multiple of stack_move_unit();
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204 // It is a signed net number of pushes (a difference in vmslots).
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205 // To compare with a stack_move value, first multiply by stack_move_unit().
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206 static int decode_MethodHandle_stack_pushes(oop mh);
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207
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208 public:
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209 // working with member names
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210 static void resolve_MemberName(Handle mname, TRAPS); // compute vmtarget/vmindex from name/type
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211 static void expand_MemberName(Handle mname, int suppress, TRAPS); // expand defc/name/type if missing
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212 static void init_MemberName(oop mname_oop, oop target); // compute vmtarget/vmindex from target
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213 static void init_MemberName(oop mname_oop, methodOop m, bool do_dispatch);
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214 static void init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset);
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215 static int find_MemberNames(klassOop k, symbolOop name, symbolOop sig,
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216 int mflags, klassOop caller,
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217 int skip, objArrayOop results);
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218 // bit values for suppress argument to expand_MemberName:
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219 enum { _suppress_defc = 1, _suppress_name = 2, _suppress_type = 4 };
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220
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221 // called from InterpreterGenerator and StubGenerator
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222 static address generate_method_handle_interpreter_entry(MacroAssembler* _masm);
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223 static void generate_method_handle_stub(MacroAssembler* _masm, EntryKind ek);
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224
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225 // argument list parsing
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226 static int argument_slot(oop method_type, int arg);
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227 static int argument_slot_count(oop method_type) { return argument_slot(method_type, -1); }
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228 static int argument_slot_to_argnum(oop method_type, int argslot);
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229
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230 // Runtime support
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231 enum { // bit-encoded flags from decode_method or decode_vmref
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232 _dmf_has_receiver = 0x01, // target method has leading reference argument
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233 _dmf_does_dispatch = 0x02, // method handle performs virtual or interface dispatch
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234 _dmf_from_interface = 0x04, // peforms interface dispatch
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235 _DMF_DIRECT_MASK = (_dmf_from_interface*2 - _dmf_has_receiver),
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236 _dmf_binds_method = 0x08,
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237 _dmf_binds_argument = 0x10,
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238 _DMF_BOUND_MASK = (_dmf_binds_argument*2 - _dmf_binds_method),
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239 _dmf_adapter_lsb = 0x20,
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240 _DMF_ADAPTER_MASK = (_dmf_adapter_lsb << CONV_OP_LIMIT) - _dmf_adapter_lsb
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241 };
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242 static methodOop decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result);
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243 enum {
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244 // format of query to getConstant:
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245 GC_JVM_PUSH_LIMIT = 0,
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246 GC_JVM_STACK_MOVE_LIMIT = 1,
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247
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248 // format of result from getTarget / encode_target:
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249 ETF_HANDLE_OR_METHOD_NAME = 0, // all available data (immediate MH or method)
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250 ETF_DIRECT_HANDLE = 1, // ultimate method handle (will be a DMH, may be self)
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251 ETF_METHOD_NAME = 2, // ultimate method as MemberName
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252 ETF_REFLECT_METHOD = 3 // ultimate method as java.lang.reflect object (sans refClass)
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253 };
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254 static int get_named_constant(int which, Handle name_box, TRAPS);
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255 static oop encode_target(Handle mh, int format, TRAPS); // report vmtarget (to Java code)
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256 static bool class_cast_needed(klassOop src, klassOop dst);
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257
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258 private:
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259 // These checkers operate on a pair of whole MethodTypes:
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260 static const char* check_method_type_change(oop src_mtype, int src_beg, int src_end,
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261 int insert_argnum, oop insert_type,
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262 int change_argnum, oop change_type,
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263 int delete_argnum,
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264 oop dst_mtype, int dst_beg, int dst_end);
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265 static const char* check_method_type_insertion(oop src_mtype,
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266 int insert_argnum, oop insert_type,
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267 oop dst_mtype) {
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268 oop no_ref = NULL;
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269 return check_method_type_change(src_mtype, 0, -1,
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270 insert_argnum, insert_type,
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271 -1, no_ref, -1, dst_mtype, 0, -1);
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272 }
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273 static const char* check_method_type_conversion(oop src_mtype,
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274 int change_argnum, oop change_type,
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275 oop dst_mtype) {
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276 oop no_ref = NULL;
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277 return check_method_type_change(src_mtype, 0, -1, -1, no_ref,
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278 change_argnum, change_type,
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279 -1, dst_mtype, 0, -1);
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280 }
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281 static const char* check_method_type_passthrough(oop src_mtype, oop dst_mtype) {
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282 oop no_ref = NULL;
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283 return check_method_type_change(src_mtype, 0, -1,
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284 -1, no_ref, -1, no_ref, -1,
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285 dst_mtype, 0, -1);
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286 }
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287
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288 // These checkers operate on pairs of argument or return types:
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289 static const char* check_argument_type_change(BasicType src_type, klassOop src_klass,
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290 BasicType dst_type, klassOop dst_klass,
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291 int argnum);
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292
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293 static const char* check_argument_type_change(oop src_type, oop dst_type,
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294 int argnum) {
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295 klassOop src_klass = NULL, dst_klass = NULL;
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296 BasicType src_bt = java_lang_Class::as_BasicType(src_type, &src_klass);
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297 BasicType dst_bt = java_lang_Class::as_BasicType(dst_type, &dst_klass);
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298 return check_argument_type_change(src_bt, src_klass,
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299 dst_bt, dst_klass, argnum);
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300 }
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301
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302 static const char* check_return_type_change(oop src_type, oop dst_type) {
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303 return check_argument_type_change(src_type, dst_type, -1);
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304 }
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305
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306 static const char* check_return_type_change(BasicType src_type, klassOop src_klass,
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307 BasicType dst_type, klassOop dst_klass) {
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308 return check_argument_type_change(src_type, src_klass, dst_type, dst_klass, -1);
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309 }
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310
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311 static const char* check_method_receiver(methodOop m, klassOop passed_recv_type);
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312
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313 // These verifiers can block, and will throw an error if the checking fails:
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314 static void verify_vmslots(Handle mh, TRAPS);
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315 static void verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS);
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316
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317 static void verify_method_type(methodHandle m, Handle mtype,
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318 bool has_bound_oop,
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319 KlassHandle bound_oop_type,
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320 TRAPS);
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321
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322 static void verify_method_signature(methodHandle m, Handle mtype,
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323 int first_ptype_pos,
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324 KlassHandle insert_ptype, TRAPS);
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325
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326 static void verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS);
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327 static void verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
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328 bool direct_to_method, TRAPS);
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329 static void verify_BoundMethodHandle_with_receiver(Handle mh, methodHandle m, TRAPS);
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330 static void verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS);
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331
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332 public:
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333
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334 // Fill in the fields of a DirectMethodHandle mh. (MH.type must be pre-filled.)
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335 static void init_DirectMethodHandle(Handle mh, methodHandle method, bool do_dispatch, TRAPS);
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336
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337 // Fill in the fields of a BoundMethodHandle mh. (MH.type, BMH.argument must be pre-filled.)
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338 static void init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS);
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339 static void init_BoundMethodHandle_with_receiver(Handle mh,
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340 methodHandle original_m,
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341 KlassHandle receiver_limit,
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342 int decode_flags,
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343 TRAPS);
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344
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345 // Fill in the fields of an AdapterMethodHandle mh. (MH.type must be pre-filled.)
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346 static void init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS);
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347
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348 #ifdef ASSERT
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349 static bool spot_check_entry_names();
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350 #endif
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351
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352 private:
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353 static methodHandle dispatch_decoded_method(methodHandle m,
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354 KlassHandle receiver_limit,
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355 int decode_flags,
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356 KlassHandle receiver_klass,
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357 TRAPS);
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358
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359 static bool same_basic_type_for_arguments(BasicType src, BasicType dst,
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360 bool for_return = false);
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361 static bool same_basic_type_for_returns(BasicType src, BasicType dst) {
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362 return same_basic_type_for_arguments(src, dst, true);
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363 }
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364
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365 enum { // arg_mask values
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366 _INSERT_NO_MASK = -1,
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367 _INSERT_REF_MASK = 0,
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368 _INSERT_INT_MASK = 1,
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369 _INSERT_LONG_MASK = 3
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370 };
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371 static void insert_arg_slots(MacroAssembler* _masm,
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372 RegisterOrConstant arg_slots,
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373 int arg_mask,
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374 Register rax_argslot,
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375 Register rbx_temp, Register rdx_temp);
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376
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377 static void remove_arg_slots(MacroAssembler* _masm,
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378 RegisterOrConstant arg_slots,
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379 Register rax_argslot,
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380 Register rbx_temp, Register rdx_temp);
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381 };
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382
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383
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384 // Access methods for the "entry" field of a java.dyn.MethodHandle.
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385 // The field is primarily a jump target for compiled calls.
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386 // However, we squirrel away some nice pointers for other uses,
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387 // just before the jump target.
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388 // Aspects of a method handle entry:
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389 // - from_compiled_entry - stub used when compiled code calls the MH
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390 // - from_interpreted_entry - stub used when the interpreter calls the MH
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391 // - type_checking_entry - stub for runtime casting between MHForm siblings (NYI)
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392 class MethodHandleEntry {
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393 public:
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394 class Data {
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395 friend class MethodHandleEntry;
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396 size_t _total_size; // size including Data and code stub
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397 MethodHandleEntry* _type_checking_entry;
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398 address _from_interpreted_entry;
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399 MethodHandleEntry* method_entry() { return (MethodHandleEntry*)(this + 1); }
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400 };
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401
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402 Data* data() { return (Data*)this - 1; }
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403
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404 address start_address() { return (address) data(); }
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405 address end_address() { return start_address() + data()->_total_size; }
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406
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407 address from_compiled_entry() { return (address) this; }
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408
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409 address from_interpreted_entry() { return data()->_from_interpreted_entry; }
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410 void set_from_interpreted_entry(address e) { data()->_from_interpreted_entry = e; }
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411
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412 MethodHandleEntry* type_checking_entry() { return data()->_type_checking_entry; }
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413 void set_type_checking_entry(MethodHandleEntry* e) { data()->_type_checking_entry = e; }
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414
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415 void set_end_address(address end_addr) {
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416 size_t total_size = end_addr - start_address();
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417 assert(total_size > 0 && total_size < 0x1000, "reasonable end address");
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418 data()->_total_size = total_size;
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419 }
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420
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421 // Compiler support:
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422 static int from_interpreted_entry_offset_in_bytes() {
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423 return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) );
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424 }
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425 static int type_checking_entry_offset_in_bytes() {
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426 return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) );
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427 }
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428
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429 static address start_compiled_entry(MacroAssembler* _masm,
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430 address interpreted_entry = NULL);
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431 static MethodHandleEntry* finish_compiled_entry(MacroAssembler* masm, address start_addr);
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432 };
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433
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434 address MethodHandles::from_compiled_entry(EntryKind ek) { return entry(ek)->from_compiled_entry(); }
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435 address MethodHandles::from_interpreted_entry(EntryKind ek) { return entry(ek)->from_interpreted_entry(); }
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