3363
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1 /*
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2 * Copyright (c) 2010, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 // Platform-specific definitions for method handles.
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26 // These definitions are inlined into class MethodHandles.
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27
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28 public:
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29
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30 // The stack just after the recursive call from a ricochet frame
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31 // looks something like this. Offsets are marked in words, not bytes.
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32 // rsi (r13 on LP64) is part of the interpreter calling sequence
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33 // which tells the callee where is my real rsp (for frame walking).
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34 // (...lower memory addresses)
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35 // rsp: [ return pc ] always the global RicochetBlob::bounce_addr
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36 // rsp+1: [ recursive arg N ]
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37 // rsp+2: [ recursive arg N-1 ]
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38 // ...
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39 // rsp+N: [ recursive arg 1 ]
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40 // rsp+N+1: [ recursive method handle ]
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41 // ...
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42 // rbp-6: [ cleanup continuation pc ] <-- (struct RicochetFrame)
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43 // rbp-5: [ saved target MH ] the MH we will call on the saved args
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44 // rbp-4: [ saved args layout oop ] an int[] array which describes argument layout
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45 // rbp-3: [ saved args pointer ] address of transformed adapter arg M (slot 0)
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46 // rbp-2: [ conversion ] information about how the return value is used
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47 // rbp-1: [ exact sender sp ] exact TOS (rsi/r13) of original sender frame
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48 // rbp+0: [ saved sender fp ] (for original sender of AMH)
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49 // rbp+1: [ saved sender pc ] (back to original sender of AMH)
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50 // rbp+2: [ transformed adapter arg M ] <-- (extended TOS of original sender)
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51 // rbp+3: [ transformed adapter arg M-1]
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52 // ...
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53 // rbp+M+1: [ transformed adapter arg 1 ]
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54 // rbp+M+2: [ padding ] <-- (rbp + saved args base offset)
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55 // ... [ optional padding]
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56 // (higher memory addresses...)
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57 //
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58 // The arguments originally passed by the original sender
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59 // are lost, and arbitrary amounts of stack motion might have
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60 // happened due to argument transformation.
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61 // (This is done by C2I/I2C adapters and non-direct method handles.)
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62 // This is why there is an unpredictable amount of memory between
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63 // the extended and exact TOS of the sender.
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64 // The ricochet adapter itself will also (in general) perform
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65 // transformations before the recursive call.
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66 //
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67 // The transformed and saved arguments, immediately above the saved
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68 // return PC, are a well-formed method handle invocation ready to execute.
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69 // When the GC needs to walk the stack, these arguments are described
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70 // via the saved arg types oop, an int[] array with a private format.
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71 // This array is derived from the type of the transformed adapter
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72 // method handle, which also sits at the base of the saved argument
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73 // bundle. Since the GC may not be able to fish out the int[]
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74 // array, so it is pushed explicitly on the stack. This may be
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75 // an unnecessary expense.
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76 //
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77 // The following register conventions are significant at this point:
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78 // rsp the thread stack, as always; preserved by caller
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79 // rsi/r13 exact TOS of recursive frame (contents of [rbp-2])
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80 // rcx recursive method handle (contents of [rsp+N+1])
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81 // rbp preserved by caller (not used by caller)
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82 // Unless otherwise specified, all registers can be blown by the call.
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83 //
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84 // If this frame must be walked, the transformed adapter arguments
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85 // will be found with the help of the saved arguments descriptor.
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86 //
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87 // Therefore, the descriptor must match the referenced arguments.
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88 // The arguments must be followed by at least one word of padding,
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89 // which will be necessary to complete the final method handle call.
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90 // That word is not treated as holding an oop. Neither is the word
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91 //
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92 // The word pointed to by the return argument pointer is not
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93 // treated as an oop, even if points to a saved argument.
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94 // This allows the saved argument list to have a "hole" in it
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95 // to receive an oop from the recursive call.
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96 // (The hole might temporarily contain RETURN_VALUE_PLACEHOLDER.)
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97 //
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98 // When the recursive callee returns, RicochetBlob::bounce_addr will
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99 // immediately jump to the continuation stored in the RF.
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100 // This continuation will merge the recursive return value
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101 // into the saved argument list. At that point, the original
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102 // rsi, rbp, and rsp will be reloaded, the ricochet frame will
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103 // disappear, and the final target of the adapter method handle
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104 // will be invoked on the transformed argument list.
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105
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106 class RicochetFrame {
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107 friend class MethodHandles;
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108
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109 private:
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110 intptr_t* _continuation; // what to do when control gets back here
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111 oopDesc* _saved_target; // target method handle to invoke on saved_args
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112 oopDesc* _saved_args_layout; // caching point for MethodTypeForm.vmlayout cookie
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113 intptr_t* _saved_args_base; // base of pushed arguments (slot 0, arg N) (-3)
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114 intptr_t _conversion; // misc. information from original AdapterMethodHandle (-2)
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115 intptr_t* _exact_sender_sp; // parallel to interpreter_frame_sender_sp (-1)
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116 intptr_t* _sender_link; // *must* coincide with frame::link_offset (0)
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117 address _sender_pc; // *must* coincide with frame::return_addr_offset (1)
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118
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119 public:
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120 intptr_t* continuation() const { return _continuation; }
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121 oop saved_target() const { return _saved_target; }
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122 oop saved_args_layout() const { return _saved_args_layout; }
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123 intptr_t* saved_args_base() const { return _saved_args_base; }
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124 intptr_t conversion() const { return _conversion; }
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125 intptr_t* exact_sender_sp() const { return _exact_sender_sp; }
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126 intptr_t* sender_link() const { return _sender_link; }
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127 address sender_pc() const { return _sender_pc; }
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128
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129 intptr_t* extended_sender_sp() const { return saved_args_base(); }
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130
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131 intptr_t return_value_slot_number() const {
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132 return adapter_conversion_vminfo(conversion());
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133 }
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134 BasicType return_value_type() const {
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135 return adapter_conversion_dest_type(conversion());
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136 }
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137 bool has_return_value_slot() const {
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138 return return_value_type() != T_VOID;
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139 }
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140 intptr_t* return_value_slot_addr() const {
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141 assert(has_return_value_slot(), "");
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142 return saved_arg_slot_addr(return_value_slot_number());
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143 }
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144 intptr_t* saved_target_slot_addr() const {
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145 return saved_arg_slot_addr(saved_args_length());
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146 }
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147 intptr_t* saved_arg_slot_addr(int slot) const {
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148 assert(slot >= 0, "");
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149 return (intptr_t*)( (address)saved_args_base() + (slot * Interpreter::stackElementSize) );
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150 }
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151
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152 jint saved_args_length() const;
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153 jint saved_arg_offset(int arg) const;
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154
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155 // GC interface
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156 oop* saved_target_addr() { return (oop*)&_saved_target; }
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157 oop* saved_args_layout_addr() { return (oop*)&_saved_args_layout; }
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158
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159 oop compute_saved_args_layout(bool read_cache, bool write_cache);
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160
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161 // Compiler/assembler interface.
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162 static int continuation_offset_in_bytes() { return offset_of(RicochetFrame, _continuation); }
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163 static int saved_target_offset_in_bytes() { return offset_of(RicochetFrame, _saved_target); }
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164 static int saved_args_layout_offset_in_bytes(){ return offset_of(RicochetFrame, _saved_args_layout); }
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165 static int saved_args_base_offset_in_bytes() { return offset_of(RicochetFrame, _saved_args_base); }
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166 static int conversion_offset_in_bytes() { return offset_of(RicochetFrame, _conversion); }
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167 static int exact_sender_sp_offset_in_bytes() { return offset_of(RicochetFrame, _exact_sender_sp); }
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168 static int sender_link_offset_in_bytes() { return offset_of(RicochetFrame, _sender_link); }
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169 static int sender_pc_offset_in_bytes() { return offset_of(RicochetFrame, _sender_pc); }
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170
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171 // This value is not used for much, but it apparently must be nonzero.
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172 static int frame_size_in_bytes() { return sender_link_offset_in_bytes(); }
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173
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174 #ifdef ASSERT
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175 // The magic number is supposed to help find ricochet frames within the bytes of stack dumps.
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176 enum { MAGIC_NUMBER_1 = 0xFEED03E, MAGIC_NUMBER_2 = 0xBEEF03E };
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177 static int magic_number_1_offset_in_bytes() { return -wordSize; }
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178 static int magic_number_2_offset_in_bytes() { return sizeof(RicochetFrame); }
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179 intptr_t magic_number_1() const { return *(intptr_t*)((address)this + magic_number_1_offset_in_bytes()); };
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180 intptr_t magic_number_2() const { return *(intptr_t*)((address)this + magic_number_2_offset_in_bytes()); };
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181 #endif //ASSERT
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182
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183 enum { RETURN_VALUE_PLACEHOLDER = (NOT_DEBUG(0) DEBUG_ONLY(42)) };
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184
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185 static void verify_offsets() NOT_DEBUG_RETURN;
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186 void verify() const NOT_DEBUG_RETURN; // check for MAGIC_NUMBER, etc.
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187 void zap_arguments() NOT_DEBUG_RETURN;
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188
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189 static void generate_ricochet_blob(MacroAssembler* _masm,
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190 // output params:
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191 int* frame_size_in_words, int* bounce_offset, int* exception_offset);
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192
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193 static void enter_ricochet_frame(MacroAssembler* _masm,
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194 Register rcx_recv,
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195 Register rax_argv,
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196 address return_handler,
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197 Register rbx_temp);
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198 static void leave_ricochet_frame(MacroAssembler* _masm,
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199 Register rcx_recv,
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200 Register new_sp_reg,
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201 Register sender_pc_reg);
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202
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203 static Address frame_address(int offset = 0) {
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204 // The RicochetFrame is found by subtracting a constant offset from rbp.
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205 return Address(rbp, - sender_link_offset_in_bytes() + offset);
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206 }
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207
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208 static RicochetFrame* from_frame(const frame& fr) {
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209 address bp = (address) fr.fp();
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210 RicochetFrame* rf = (RicochetFrame*)(bp - sender_link_offset_in_bytes());
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211 rf->verify();
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212 return rf;
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213 }
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214
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215 static void verify_clean(MacroAssembler* _masm) NOT_DEBUG_RETURN;
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216 };
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217
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218 // Additional helper methods for MethodHandles code generation:
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219 public:
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220 static void load_klass_from_Class(MacroAssembler* _masm, Register klass_reg);
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221 static void load_conversion_vminfo(MacroAssembler* _masm, Register reg, Address conversion_field_addr);
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222 static void load_conversion_dest_type(MacroAssembler* _masm, Register reg, Address conversion_field_addr);
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223
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224 static void load_stack_move(MacroAssembler* _masm,
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225 Register rdi_stack_move,
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226 Register rcx_amh,
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227 bool might_be_negative);
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228
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229 static void insert_arg_slots(MacroAssembler* _masm,
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230 RegisterOrConstant arg_slots,
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231 Register rax_argslot,
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232 Register rbx_temp, Register rdx_temp);
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233
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234 static void remove_arg_slots(MacroAssembler* _masm,
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235 RegisterOrConstant arg_slots,
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236 Register rax_argslot,
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237 Register rbx_temp, Register rdx_temp);
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238
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239 static void push_arg_slots(MacroAssembler* _masm,
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240 Register rax_argslot,
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241 RegisterOrConstant slot_count,
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242 int skip_words_count,
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243 Register rbx_temp, Register rdx_temp);
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244
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245 static void move_arg_slots_up(MacroAssembler* _masm,
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246 Register rbx_bottom, // invariant
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247 Address top_addr, // can use rax_temp
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248 RegisterOrConstant positive_distance_in_slots,
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249 Register rax_temp, Register rdx_temp);
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250
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251 static void move_arg_slots_down(MacroAssembler* _masm,
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252 Address bottom_addr, // can use rax_temp
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253 Register rbx_top, // invariant
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254 RegisterOrConstant negative_distance_in_slots,
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255 Register rax_temp, Register rdx_temp);
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256
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257 static void move_typed_arg(MacroAssembler* _masm,
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258 BasicType type, bool is_element,
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259 Address slot_dest, Address value_src,
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260 Register rbx_temp, Register rdx_temp);
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261
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262 static void move_return_value(MacroAssembler* _masm, BasicType type,
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263 Address return_slot);
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264
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265 static void verify_argslot(MacroAssembler* _masm, Register argslot_reg,
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266 const char* error_message) NOT_DEBUG_RETURN;
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267
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268 static void verify_argslots(MacroAssembler* _masm,
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269 RegisterOrConstant argslot_count,
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270 Register argslot_reg,
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271 bool negate_argslot,
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272 const char* error_message) NOT_DEBUG_RETURN;
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273
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274 static void verify_stack_move(MacroAssembler* _masm,
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275 RegisterOrConstant arg_slots,
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276 int direction) NOT_DEBUG_RETURN;
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277
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278 static void verify_klass(MacroAssembler* _masm,
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279 Register obj, KlassHandle klass,
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280 const char* error_message = "wrong klass") NOT_DEBUG_RETURN;
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281
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282 static void verify_method_handle(MacroAssembler* _masm, Register mh_reg) {
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283 verify_klass(_masm, mh_reg, SystemDictionaryHandles::MethodHandle_klass(),
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284 "reference is a MH");
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285 }
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286
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287 static void trace_method_handle(MacroAssembler* _masm, const char* adaptername) PRODUCT_RETURN;
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288
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289 static Register saved_last_sp_register() {
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290 // Should be in sharedRuntime, not here.
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291 return LP64_ONLY(r13) NOT_LP64(rsi);
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292 }
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