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1 /* |
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2 * Copyright (c) 2008, 2017, 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 #include "precompiled.hpp" |
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26 #include "asm/macroAssembler.hpp" |
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27 #include "classfile/javaClasses.inline.hpp" |
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28 #include "interpreter/interpreter.hpp" |
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29 #include "interpreter/interp_masm.hpp" |
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30 #include "memory/allocation.inline.hpp" |
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31 #include "memory/resourceArea.hpp" |
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32 #include "prims/jvm.h" |
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33 #include "prims/methodHandles.hpp" |
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34 |
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35 #define __ _masm-> |
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36 |
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37 #ifdef PRODUCT |
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38 #define BLOCK_COMMENT(str) /* nothing */ |
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39 #define STOP(error) stop(error) |
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40 #else |
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41 #define BLOCK_COMMENT(str) __ block_comment(str) |
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42 #define STOP(error) block_comment(error); __ stop(error) |
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43 #endif |
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44 |
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45 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") |
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46 |
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47 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant. |
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48 static RegisterOrConstant constant(int value) { |
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49 return RegisterOrConstant(value); |
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50 } |
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51 |
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52 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) { |
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53 if (VerifyMethodHandles) |
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54 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg, |
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55 "MH argument is a Class"); |
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56 __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg); |
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57 } |
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58 |
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59 #ifdef ASSERT |
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60 static int check_nonzero(const char* xname, int x) { |
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61 assert(x != 0, "%s should be nonzero", xname); |
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62 return x; |
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63 } |
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64 #define NONZERO(x) check_nonzero(#x, x) |
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65 #else //ASSERT |
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66 #define NONZERO(x) (x) |
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67 #endif //ASSERT |
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68 |
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69 #ifdef ASSERT |
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70 void MethodHandles::verify_klass(MacroAssembler* _masm, |
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71 Register obj_reg, SystemDictionary::WKID klass_id, |
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72 Register temp_reg, Register temp2_reg, |
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73 const char* error_message) { |
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74 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); |
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75 Klass* klass = SystemDictionary::well_known_klass(klass_id); |
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76 bool did_save = false; |
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77 if (temp_reg == noreg || temp2_reg == noreg) { |
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78 temp_reg = L1; |
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79 temp2_reg = L2; |
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80 __ save_frame_and_mov(0, obj_reg, L0); |
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81 obj_reg = L0; |
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82 did_save = true; |
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83 } |
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84 Label L_ok, L_bad; |
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85 BLOCK_COMMENT("verify_klass {"); |
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86 __ verify_oop(obj_reg); |
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87 __ br_null_short(obj_reg, Assembler::pn, L_bad); |
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88 __ load_klass(obj_reg, temp_reg); |
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89 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); |
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90 __ ld_ptr(Address(temp2_reg, 0), temp2_reg); |
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91 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); |
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92 intptr_t super_check_offset = klass->super_check_offset(); |
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93 __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg); |
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94 __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg); |
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95 __ ld_ptr(Address(temp2_reg, 0), temp2_reg); |
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96 __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok); |
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97 __ BIND(L_bad); |
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98 if (did_save) __ restore(); |
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99 __ STOP(error_message); |
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100 __ BIND(L_ok); |
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101 if (did_save) __ restore(); |
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102 BLOCK_COMMENT("} verify_klass"); |
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103 } |
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104 |
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105 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { |
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106 Label L; |
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107 BLOCK_COMMENT("verify_ref_kind {"); |
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108 __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp); |
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109 __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp); |
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110 __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, temp); |
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111 __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L); |
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112 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); |
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113 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); |
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114 if (ref_kind == JVM_REF_invokeVirtual || |
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115 ref_kind == JVM_REF_invokeSpecial) |
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116 // could do this for all ref_kinds, but would explode assembly code size |
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117 trace_method_handle(_masm, buf); |
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118 __ STOP(buf); |
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119 } |
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120 BLOCK_COMMENT("} verify_ref_kind"); |
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121 __ bind(L); |
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122 } |
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123 |
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124 #endif // ASSERT |
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125 |
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126 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp, |
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127 bool for_compiler_entry) { |
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128 Label L_no_such_method; |
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129 assert(method == G5_method, "interpreter calling convention"); |
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130 assert_different_registers(method, target, temp); |
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131 |
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132 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { |
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133 Label run_compiled_code; |
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134 // JVMTI events, such as single-stepping, are implemented partly by avoiding running |
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135 // compiled code in threads for which the event is enabled. Check here for |
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136 // interp_only_mode if these events CAN be enabled. |
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137 __ verify_thread(); |
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138 const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset()); |
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139 __ ld(interp_only, temp); |
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140 __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code); |
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141 // Null method test is replicated below in compiled case, |
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142 // it might be able to address across the verify_thread() |
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143 __ br_null_short(G5_method, Assembler::pn, L_no_such_method); |
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144 __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target); |
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145 __ jmp(target, 0); |
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146 __ delayed()->nop(); |
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147 __ BIND(run_compiled_code); |
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148 // Note: we could fill some delay slots here, but |
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149 // it doesn't matter, since this is interpreter code. |
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150 } |
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151 |
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152 // Compiled case, either static or fall-through from runtime conditional |
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153 __ br_null_short(G5_method, Assembler::pn, L_no_such_method); |
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154 |
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155 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : |
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156 Method::from_interpreted_offset(); |
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157 __ ld_ptr(G5_method, in_bytes(entry_offset), target); |
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158 __ jmp(target, 0); |
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159 __ delayed()->nop(); |
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160 |
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161 __ bind(L_no_such_method); |
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162 AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry()); |
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163 __ jump_to(ame, temp); |
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164 __ delayed()->nop(); |
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165 } |
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166 |
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167 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, |
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168 Register recv, Register method_temp, |
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169 Register temp2, Register temp3, |
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170 bool for_compiler_entry) { |
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171 BLOCK_COMMENT("jump_to_lambda_form {"); |
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172 // This is the initial entry point of a lazy method handle. |
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173 // After type checking, it picks up the invoker from the LambdaForm. |
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174 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on |
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175 assert(method_temp == G5_method, "required register for loading method"); |
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176 |
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177 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); |
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178 |
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179 // Load the invoker, as MH -> MH.form -> LF.vmentry |
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180 __ verify_oop(recv); |
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181 __ load_heap_oop(Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())), method_temp); |
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182 __ verify_oop(method_temp); |
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183 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp); |
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184 __ verify_oop(method_temp); |
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185 __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), method_temp); |
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186 __ verify_oop(method_temp); |
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187 __ ld_ptr( Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())), method_temp); |
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188 |
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189 if (VerifyMethodHandles && !for_compiler_entry) { |
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190 // make sure recv is already on stack |
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191 __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2); |
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192 __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()), |
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193 temp2, |
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194 sizeof(u2), /*is_signed*/ false); |
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195 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
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196 Label L; |
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197 __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2); |
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198 __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L); |
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199 __ STOP("receiver not on stack"); |
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200 __ BIND(L); |
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201 } |
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202 |
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203 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry); |
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204 BLOCK_COMMENT("} jump_to_lambda_form"); |
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205 } |
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206 |
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207 |
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208 // Code generation |
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209 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, |
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210 vmIntrinsics::ID iid) { |
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211 const bool not_for_compiler_entry = false; // this is the interpreter entry |
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212 assert(is_signature_polymorphic(iid), "expected invoke iid"); |
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213 if (iid == vmIntrinsics::_invokeGeneric || |
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214 iid == vmIntrinsics::_compiledLambdaForm) { |
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215 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. |
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216 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. |
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217 // They all allow an appendix argument. |
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218 __ should_not_reach_here(); // empty stubs make SG sick |
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219 return NULL; |
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220 } |
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221 |
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222 // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted) |
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223 // G5_method: Method* |
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224 // G4 (Gargs): incoming argument list (must preserve) |
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225 // O0: used as temp to hold mh or receiver |
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226 // O1, O4: garbage temps, blown away |
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227 Register O1_scratch = O1; |
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228 Register O4_param_size = O4; // size of parameters |
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229 |
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230 // here's where control starts out: |
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231 __ align(CodeEntryAlignment); |
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232 address entry_point = __ pc(); |
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233 |
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234 if (VerifyMethodHandles) { |
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235 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); |
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236 |
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237 Label L; |
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238 BLOCK_COMMENT("verify_intrinsic_id {"); |
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239 __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch); |
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240 __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L); |
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241 if (iid == vmIntrinsics::_linkToVirtual || |
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242 iid == vmIntrinsics::_linkToSpecial) { |
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243 // could do this for all kinds, but would explode assembly code size |
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244 trace_method_handle(_masm, "bad Method*::intrinsic_id"); |
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245 } |
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246 __ STOP("bad Method*::intrinsic_id"); |
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247 __ bind(L); |
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248 BLOCK_COMMENT("} verify_intrinsic_id"); |
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249 } |
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250 |
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251 // First task: Find out how big the argument list is. |
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252 Address O4_first_arg_addr; |
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253 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); |
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254 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); |
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255 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { |
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256 __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size); |
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257 __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()), |
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258 O4_param_size, |
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259 sizeof(u2), /*is_signed*/ false); |
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260 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
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261 O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1); |
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262 } else { |
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263 DEBUG_ONLY(O4_param_size = noreg); |
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264 } |
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265 |
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266 Register O0_mh = noreg; |
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267 if (!is_signature_polymorphic_static(iid)) { |
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268 __ ld_ptr(O4_first_arg_addr, O0_mh = O0); |
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269 DEBUG_ONLY(O4_param_size = noreg); |
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270 } |
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271 |
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272 // O4_first_arg_addr is live! |
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273 |
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274 if (TraceMethodHandles) { |
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275 if (O0_mh != noreg) |
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276 __ mov(O0_mh, G3_method_handle); // make stub happy |
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277 trace_method_handle_interpreter_entry(_masm, iid); |
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278 } |
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279 |
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280 if (iid == vmIntrinsics::_invokeBasic) { |
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281 generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry); |
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282 |
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283 } else { |
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284 // Adjust argument list by popping the trailing MemberName argument. |
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285 Register O0_recv = noreg; |
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286 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { |
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287 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. |
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288 __ ld_ptr(O4_first_arg_addr, O0_recv = O0); |
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289 DEBUG_ONLY(O4_param_size = noreg); |
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290 } |
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291 Register G5_member = G5_method; // MemberName ptr; incoming method ptr is dead now |
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292 __ ld_ptr(__ argument_address(constant(0)), G5_member); |
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293 __ add(Gargs, Interpreter::stackElementSize, Gargs); |
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294 generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry); |
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295 } |
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296 |
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297 return entry_point; |
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298 } |
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299 |
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300 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, |
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301 vmIntrinsics::ID iid, |
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302 Register receiver_reg, |
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303 Register member_reg, |
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304 bool for_compiler_entry) { |
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305 assert(is_signature_polymorphic(iid), "expected invoke iid"); |
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306 Register temp1 = (for_compiler_entry ? G1_scratch : O1); |
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307 Register temp2 = (for_compiler_entry ? G3_scratch : O2); |
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308 Register temp3 = (for_compiler_entry ? G4_scratch : O3); |
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309 Register temp4 = (for_compiler_entry ? noreg : O4); |
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310 if (for_compiler_entry) { |
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311 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment"); |
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312 assert_different_registers(temp1, O0, O1, O2, O3, O4, O5); |
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313 assert_different_registers(temp2, O0, O1, O2, O3, O4, O5); |
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314 assert_different_registers(temp3, O0, O1, O2, O3, O4, O5); |
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315 assert_different_registers(temp4, O0, O1, O2, O3, O4, O5); |
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316 } else { |
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317 assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP); // don't trash lastSP |
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318 } |
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319 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg); |
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320 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg); |
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321 |
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322 if (iid == vmIntrinsics::_invokeBasic) { |
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323 // indirect through MH.form.vmentry.vmtarget |
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324 jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, for_compiler_entry); |
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325 |
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326 } else { |
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327 // The method is a member invoker used by direct method handles. |
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328 if (VerifyMethodHandles) { |
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329 // make sure the trailing argument really is a MemberName (caller responsibility) |
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330 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass), |
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331 temp1, temp2, |
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332 "MemberName required for invokeVirtual etc."); |
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333 } |
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334 |
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335 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); |
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336 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); |
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337 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())); |
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338 Address vmtarget_method( G5_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())); |
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339 |
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340 Register temp1_recv_klass = temp1; |
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341 if (iid != vmIntrinsics::_linkToStatic) { |
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342 __ verify_oop(receiver_reg); |
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343 if (iid == vmIntrinsics::_linkToSpecial) { |
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344 // Don't actually load the klass; just null-check the receiver. |
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345 __ null_check(receiver_reg); |
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346 } else { |
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347 // load receiver klass itself |
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348 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); |
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349 __ load_klass(receiver_reg, temp1_recv_klass); |
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350 __ verify_klass_ptr(temp1_recv_klass); |
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351 } |
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352 BLOCK_COMMENT("check_receiver {"); |
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353 // The receiver for the MemberName must be in receiver_reg. |
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354 // Check the receiver against the MemberName.clazz |
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355 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { |
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356 // Did not load it above... |
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357 __ load_klass(receiver_reg, temp1_recv_klass); |
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358 __ verify_klass_ptr(temp1_recv_klass); |
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359 } |
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360 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { |
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361 Label L_ok; |
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362 Register temp2_defc = temp2; |
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363 __ load_heap_oop(member_clazz, temp2_defc); |
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364 load_klass_from_Class(_masm, temp2_defc, temp3, temp4); |
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365 __ verify_klass_ptr(temp2_defc); |
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366 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok); |
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367 // If we get here, the type check failed! |
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368 __ STOP("receiver class disagrees with MemberName.clazz"); |
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369 __ bind(L_ok); |
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370 } |
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371 BLOCK_COMMENT("} check_receiver"); |
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372 } |
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373 if (iid == vmIntrinsics::_linkToSpecial || |
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374 iid == vmIntrinsics::_linkToStatic) { |
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375 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass |
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376 } |
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377 |
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378 // Live registers at this point: |
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379 // member_reg - MemberName that was the trailing argument |
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380 // temp1_recv_klass - klass of stacked receiver, if needed |
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381 // O5_savedSP - interpreter linkage (if interpreted) |
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382 // O0..O5 - compiler arguments (if compiled) |
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383 |
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384 Label L_incompatible_class_change_error; |
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385 switch (iid) { |
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386 case vmIntrinsics::_linkToSpecial: |
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387 if (VerifyMethodHandles) { |
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388 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2); |
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389 } |
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390 __ load_heap_oop(member_vmtarget, G5_method); |
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391 __ ld_ptr(vmtarget_method, G5_method); |
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392 break; |
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393 |
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394 case vmIntrinsics::_linkToStatic: |
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395 if (VerifyMethodHandles) { |
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396 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2); |
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397 } |
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398 __ load_heap_oop(member_vmtarget, G5_method); |
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399 __ ld_ptr(vmtarget_method, G5_method); |
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400 break; |
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401 |
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402 case vmIntrinsics::_linkToVirtual: |
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403 { |
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404 // same as TemplateTable::invokevirtual, |
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405 // minus the CP setup and profiling: |
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406 |
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407 if (VerifyMethodHandles) { |
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408 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2); |
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409 } |
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410 |
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411 // pick out the vtable index from the MemberName, and then we can discard it: |
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412 Register temp2_index = temp2; |
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413 __ ld_ptr(member_vmindex, temp2_index); |
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414 |
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415 if (VerifyMethodHandles) { |
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416 Label L_index_ok; |
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417 __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok); |
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418 __ STOP("no virtual index"); |
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419 __ BIND(L_index_ok); |
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420 } |
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421 |
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422 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget |
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423 // at this point. And VerifyMethodHandles has already checked clazz, if needed. |
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424 |
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425 // get target Method* & entry point |
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426 __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method); |
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427 break; |
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428 } |
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429 |
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430 case vmIntrinsics::_linkToInterface: |
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431 { |
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432 // same as TemplateTable::invokeinterface |
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433 // (minus the CP setup and profiling, with different argument motion) |
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434 if (VerifyMethodHandles) { |
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435 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2); |
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436 } |
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437 |
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438 Register temp2_intf = temp2; |
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439 __ load_heap_oop(member_clazz, temp2_intf); |
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440 load_klass_from_Class(_masm, temp2_intf, temp3, temp4); |
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441 __ verify_klass_ptr(temp2_intf); |
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442 |
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443 Register G5_index = G5_method; |
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444 __ ld_ptr(member_vmindex, G5_index); |
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445 if (VerifyMethodHandles) { |
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446 Label L; |
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447 __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L); |
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448 __ STOP("invalid vtable index for MH.invokeInterface"); |
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449 __ bind(L); |
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450 } |
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451 |
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452 // given intf, index, and recv klass, dispatch to the implementation method |
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453 __ lookup_interface_method(temp1_recv_klass, temp2_intf, |
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454 // note: next two args must be the same: |
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455 G5_index, G5_method, |
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456 temp3, temp4, |
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457 L_incompatible_class_change_error); |
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458 break; |
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459 } |
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460 |
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461 default: |
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462 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); |
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463 break; |
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464 } |
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465 |
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466 // Live at this point: |
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467 // G5_method |
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468 // O5_savedSP (if interpreted) |
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469 |
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470 // After figuring out which concrete method to call, jump into it. |
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471 // Note that this works in the interpreter with no data motion. |
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472 // But the compiled version will require that rcx_recv be shifted out. |
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473 __ verify_method_ptr(G5_method); |
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474 jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry); |
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475 |
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476 if (iid == vmIntrinsics::_linkToInterface) { |
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477 __ BIND(L_incompatible_class_change_error); |
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478 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); |
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479 __ jump_to(icce, temp1); |
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480 __ delayed()->nop(); |
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481 } |
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482 } |
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483 } |
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484 |
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485 #ifndef PRODUCT |
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486 void trace_method_handle_stub(const char* adaptername, |
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487 oopDesc* mh, |
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488 intptr_t* saved_sp, |
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489 intptr_t* args, |
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490 intptr_t* tracing_fp) { |
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491 bool has_mh = (strstr(adaptername, "/static") == NULL && |
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492 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH |
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493 const char* mh_reg_name = has_mh ? "G3_mh" : "G3"; |
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494 tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT, |
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495 adaptername, mh_reg_name, |
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496 p2i(mh), p2i(saved_sp), p2i(args)); |
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497 |
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498 if (Verbose) { |
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499 // dumping last frame with frame::describe |
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500 |
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501 JavaThread* p = JavaThread::active(); |
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502 |
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503 ResourceMark rm; |
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504 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here |
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505 FrameValues values; |
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506 |
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507 // Note: We want to allow trace_method_handle from any call site. |
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508 // While trace_method_handle creates a frame, it may be entered |
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509 // without a valid return PC in O7 (e.g. not just after a call). |
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510 // Walking that frame could lead to failures due to that invalid PC. |
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511 // => carefully detect that frame when doing the stack walking |
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512 |
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513 // walk up to the right frame using the "tracing_fp" argument |
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514 intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); |
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515 frame cur_frame(cur_sp, frame::unpatchable, NULL); |
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516 |
|
517 while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) { |
|
518 cur_frame = os::get_sender_for_C_frame(&cur_frame); |
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519 } |
|
520 |
|
521 // safely create a frame and call frame::describe |
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522 intptr_t *dump_sp = cur_frame.sender_sp(); |
|
523 intptr_t *dump_fp = cur_frame.link(); |
|
524 |
|
525 bool walkable = has_mh; // whether the traced frame shoud be walkable |
|
526 |
|
527 // the sender for cur_frame is the caller of trace_method_handle |
|
528 if (walkable) { |
|
529 // The previous definition of walkable may have to be refined |
|
530 // if new call sites cause the next frame constructor to start |
|
531 // failing. Alternatively, frame constructors could be |
|
532 // modified to support the current or future non walkable |
|
533 // frames (but this is more intrusive and is not considered as |
|
534 // part of this RFE, which will instead use a simpler output). |
|
535 frame dump_frame = frame(dump_sp, |
|
536 cur_frame.sp(), // younger_sp |
|
537 false); // no adaptation |
|
538 dump_frame.describe(values, 1); |
|
539 } else { |
|
540 // Robust dump for frames which cannot be constructed from sp/younger_sp |
|
541 // Add descriptions without building a Java frame to avoid issues |
|
542 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); |
|
543 values.describe(-1, dump_sp, "sp"); |
|
544 } |
|
545 |
|
546 bool has_args = has_mh; // whether Gargs is meaningful |
|
547 |
|
548 // mark args, if seems valid (may not be valid for some adapters) |
|
549 if (has_args) { |
|
550 if ((args >= dump_sp) && (args < dump_fp)) { |
|
551 values.describe(-1, args, "*G4_args"); |
|
552 } |
|
553 } |
|
554 |
|
555 // mark saved_sp, if seems valid (may not be valid for some adapters) |
|
556 intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp); |
|
557 const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP); |
|
558 if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) { |
|
559 values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS"); |
|
560 } |
|
561 |
|
562 // Note: the unextended_sp may not be correct |
|
563 tty->print_cr(" stack layout:"); |
|
564 values.print(p); |
|
565 if (has_mh && oopDesc::is_oop(mh)) { |
|
566 mh->print(); |
|
567 if (java_lang_invoke_MethodHandle::is_instance(mh)) { |
|
568 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) |
|
569 java_lang_invoke_MethodHandle::form(mh)->print(); |
|
570 } |
|
571 } |
|
572 } |
|
573 } |
|
574 |
|
575 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { |
|
576 if (!TraceMethodHandles) return; |
|
577 BLOCK_COMMENT("trace_method_handle {"); |
|
578 // save: Gargs, O5_savedSP |
|
579 __ save_frame(16); // need space for saving required FPU state |
|
580 |
|
581 __ set((intptr_t) adaptername, O0); |
|
582 __ mov(G3_method_handle, O1); |
|
583 __ mov(I5_savedSP, O2); |
|
584 __ mov(Gargs, O3); |
|
585 __ mov(I6, O4); // frame identifier for safe stack walking |
|
586 |
|
587 // Save scratched registers that might be needed. Robustness is more |
|
588 // important than optimizing the saves for this debug only code. |
|
589 |
|
590 // save FP result, valid at some call sites (adapter_opt_return_float, ...) |
|
591 Address d_save(FP, -sizeof(jdouble) + STACK_BIAS); |
|
592 __ stf(FloatRegisterImpl::D, Ftos_d, d_save); |
|
593 // Safely save all globals but G2 (handled by call_VM_leaf) and G7 |
|
594 // (OS reserved). |
|
595 __ mov(G3_method_handle, L3); |
|
596 __ mov(Gargs, L4); |
|
597 __ mov(G5_method_type, L5); |
|
598 __ mov(G6, L6); |
|
599 __ mov(G1, L1); |
|
600 |
|
601 __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub)); |
|
602 |
|
603 __ mov(L3, G3_method_handle); |
|
604 __ mov(L4, Gargs); |
|
605 __ mov(L5, G5_method_type); |
|
606 __ mov(L6, G6); |
|
607 __ mov(L1, G1); |
|
608 __ ldf(FloatRegisterImpl::D, d_save, Ftos_d); |
|
609 |
|
610 __ restore(); |
|
611 BLOCK_COMMENT("} trace_method_handle"); |
|
612 } |
|
613 #endif // PRODUCT |