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1 /* |
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2 * Copyright (c) 1997, 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/interpreterRuntime.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 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) { |
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48 if (VerifyMethodHandles) |
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49 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), |
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50 "MH argument is a Class"); |
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51 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes())); |
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52 } |
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53 |
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54 #ifdef ASSERT |
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55 static int check_nonzero(const char* xname, int x) { |
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56 assert(x != 0, "%s should be nonzero", xname); |
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57 return x; |
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58 } |
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59 #define NONZERO(x) check_nonzero(#x, x) |
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60 #else //ASSERT |
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61 #define NONZERO(x) (x) |
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62 #endif //ASSERT |
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63 |
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64 #ifdef ASSERT |
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65 void MethodHandles::verify_klass(MacroAssembler* _masm, |
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66 Register obj, SystemDictionary::WKID klass_id, |
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67 const char* error_message) { |
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68 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id); |
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69 Klass* klass = SystemDictionary::well_known_klass(klass_id); |
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70 Register temp = rdi; |
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71 Register temp2 = noreg; |
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72 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr |
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73 Label L_ok, L_bad; |
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74 BLOCK_COMMENT("verify_klass {"); |
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75 __ verify_oop(obj); |
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76 __ testptr(obj, obj); |
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77 __ jcc(Assembler::zero, L_bad); |
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78 __ push(temp); if (temp2 != noreg) __ push(temp2); |
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79 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); } |
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80 __ load_klass(temp, obj); |
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81 __ cmpptr(temp, ExternalAddress((address) klass_addr)); |
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82 __ jcc(Assembler::equal, L_ok); |
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83 intptr_t super_check_offset = klass->super_check_offset(); |
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84 __ movptr(temp, Address(temp, super_check_offset)); |
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85 __ cmpptr(temp, ExternalAddress((address) klass_addr)); |
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86 __ jcc(Assembler::equal, L_ok); |
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87 UNPUSH; |
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88 __ bind(L_bad); |
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89 __ STOP(error_message); |
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90 __ BIND(L_ok); |
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91 UNPUSH; |
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92 BLOCK_COMMENT("} verify_klass"); |
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93 } |
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94 |
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95 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) { |
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96 Label L; |
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97 BLOCK_COMMENT("verify_ref_kind {"); |
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98 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()))); |
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99 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT); |
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100 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK); |
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101 __ cmpl(temp, ref_kind); |
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102 __ jcc(Assembler::equal, L); |
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103 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal); |
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104 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind); |
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105 if (ref_kind == JVM_REF_invokeVirtual || |
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106 ref_kind == JVM_REF_invokeSpecial) |
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107 // could do this for all ref_kinds, but would explode assembly code size |
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108 trace_method_handle(_masm, buf); |
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109 __ STOP(buf); |
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110 } |
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111 BLOCK_COMMENT("} verify_ref_kind"); |
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112 __ bind(L); |
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113 } |
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114 |
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115 #endif //ASSERT |
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116 |
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117 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp, |
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118 bool for_compiler_entry) { |
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119 assert(method == rbx, "interpreter calling convention"); |
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120 |
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121 Label L_no_such_method; |
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122 __ testptr(rbx, rbx); |
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123 __ jcc(Assembler::zero, L_no_such_method); |
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124 |
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125 __ verify_method_ptr(method); |
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126 |
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127 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) { |
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128 Label run_compiled_code; |
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129 // JVMTI events, such as single-stepping, are implemented partly by avoiding running |
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130 // compiled code in threads for which the event is enabled. Check here for |
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131 // interp_only_mode if these events CAN be enabled. |
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132 #ifdef _LP64 |
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133 Register rthread = r15_thread; |
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134 #else |
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135 Register rthread = temp; |
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136 __ get_thread(rthread); |
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137 #endif |
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138 // interp_only is an int, on little endian it is sufficient to test the byte only |
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139 // Is a cmpl faster? |
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140 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0); |
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141 __ jccb(Assembler::zero, run_compiled_code); |
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142 __ jmp(Address(method, Method::interpreter_entry_offset())); |
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143 __ BIND(run_compiled_code); |
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144 } |
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145 |
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146 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() : |
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147 Method::from_interpreted_offset(); |
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148 __ jmp(Address(method, entry_offset)); |
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149 |
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150 __ bind(L_no_such_method); |
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151 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry())); |
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152 } |
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153 |
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154 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm, |
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155 Register recv, Register method_temp, |
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156 Register temp2, |
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157 bool for_compiler_entry) { |
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158 BLOCK_COMMENT("jump_to_lambda_form {"); |
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159 // This is the initial entry point of a lazy method handle. |
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160 // After type checking, it picks up the invoker from the LambdaForm. |
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161 assert_different_registers(recv, method_temp, temp2); |
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162 assert(recv != noreg, "required register"); |
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163 assert(method_temp == rbx, "required register for loading method"); |
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164 |
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165 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); }); |
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166 |
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167 // Load the invoker, as MH -> MH.form -> LF.vmentry |
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168 __ verify_oop(recv); |
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169 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()))); |
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170 __ verify_oop(method_temp); |
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171 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()))); |
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172 __ verify_oop(method_temp); |
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173 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()))); |
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174 __ verify_oop(method_temp); |
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175 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()))); |
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176 |
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177 if (VerifyMethodHandles && !for_compiler_entry) { |
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178 // make sure recv is already on stack |
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179 __ movptr(temp2, Address(method_temp, Method::const_offset())); |
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180 __ load_sized_value(temp2, |
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181 Address(temp2, ConstMethod::size_of_parameters_offset()), |
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182 sizeof(u2), /*is_signed*/ false); |
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183 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
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184 Label L; |
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185 __ cmpptr(recv, __ argument_address(temp2, -1)); |
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186 __ jcc(Assembler::equal, L); |
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187 __ movptr(rax, __ argument_address(temp2, -1)); |
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188 __ STOP("receiver not on stack"); |
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189 __ BIND(L); |
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190 } |
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191 |
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192 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry); |
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193 BLOCK_COMMENT("} jump_to_lambda_form"); |
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194 } |
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195 |
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196 |
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197 // Code generation |
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198 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm, |
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199 vmIntrinsics::ID iid) { |
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200 const bool not_for_compiler_entry = false; // this is the interpreter entry |
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201 assert(is_signature_polymorphic(iid), "expected invoke iid"); |
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202 if (iid == vmIntrinsics::_invokeGeneric || |
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203 iid == vmIntrinsics::_compiledLambdaForm) { |
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204 // Perhaps surprisingly, the symbolic references visible to Java are not directly used. |
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205 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod. |
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206 // They all allow an appendix argument. |
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207 __ hlt(); // empty stubs make SG sick |
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208 return NULL; |
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209 } |
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210 |
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211 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted) |
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212 // rbx: Method* |
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213 // rdx: argument locator (parameter slot count, added to rsp) |
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214 // rcx: used as temp to hold mh or receiver |
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215 // rax, rdi: garbage temps, blown away |
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216 Register rdx_argp = rdx; // argument list ptr, live on error paths |
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217 Register rax_temp = rax; |
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218 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled |
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219 Register rbx_method = rbx; // eventual target of this invocation |
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220 |
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221 // here's where control starts out: |
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222 __ align(CodeEntryAlignment); |
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223 address entry_point = __ pc(); |
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224 |
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225 if (VerifyMethodHandles) { |
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226 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2"); |
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227 |
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228 Label L; |
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229 BLOCK_COMMENT("verify_intrinsic_id {"); |
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230 __ cmpw(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid); |
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231 __ jcc(Assembler::equal, L); |
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232 if (iid == vmIntrinsics::_linkToVirtual || |
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233 iid == vmIntrinsics::_linkToSpecial) { |
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234 // could do this for all kinds, but would explode assembly code size |
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235 trace_method_handle(_masm, "bad Method*::intrinsic_id"); |
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236 } |
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237 __ STOP("bad Method*::intrinsic_id"); |
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238 __ bind(L); |
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239 BLOCK_COMMENT("} verify_intrinsic_id"); |
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240 } |
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241 |
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242 // First task: Find out how big the argument list is. |
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243 Address rdx_first_arg_addr; |
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244 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid); |
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245 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic"); |
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246 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) { |
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247 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset())); |
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248 __ load_sized_value(rdx_argp, |
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249 Address(rdx_argp, ConstMethod::size_of_parameters_offset()), |
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250 sizeof(u2), /*is_signed*/ false); |
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251 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), ""); |
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252 rdx_first_arg_addr = __ argument_address(rdx_argp, -1); |
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253 } else { |
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254 DEBUG_ONLY(rdx_argp = noreg); |
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255 } |
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256 |
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257 if (!is_signature_polymorphic_static(iid)) { |
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258 __ movptr(rcx_mh, rdx_first_arg_addr); |
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259 DEBUG_ONLY(rdx_argp = noreg); |
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260 } |
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261 |
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262 // rdx_first_arg_addr is live! |
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263 |
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264 trace_method_handle_interpreter_entry(_masm, iid); |
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265 |
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266 if (iid == vmIntrinsics::_invokeBasic) { |
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267 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry); |
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268 |
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269 } else { |
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270 // Adjust argument list by popping the trailing MemberName argument. |
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271 Register rcx_recv = noreg; |
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272 if (MethodHandles::ref_kind_has_receiver(ref_kind)) { |
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273 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack. |
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274 __ movptr(rcx_recv = rcx, rdx_first_arg_addr); |
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275 } |
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276 DEBUG_ONLY(rdx_argp = noreg); |
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277 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now |
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278 __ pop(rax_temp); // return address |
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279 __ pop(rbx_member); // extract last argument |
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280 __ push(rax_temp); // re-push return address |
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281 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry); |
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282 } |
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283 |
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284 return entry_point; |
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285 } |
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286 |
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287 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm, |
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288 vmIntrinsics::ID iid, |
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289 Register receiver_reg, |
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290 Register member_reg, |
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291 bool for_compiler_entry) { |
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292 assert(is_signature_polymorphic(iid), "expected invoke iid"); |
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293 Register rbx_method = rbx; // eventual target of this invocation |
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294 // temps used in this code are not used in *either* compiled or interpreted calling sequences |
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295 #ifdef _LP64 |
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296 Register temp1 = rscratch1; |
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297 Register temp2 = rscratch2; |
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298 Register temp3 = rax; |
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299 if (for_compiler_entry) { |
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300 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment"); |
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301 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); |
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302 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); |
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303 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5); |
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304 } |
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305 #else |
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306 Register temp1 = (for_compiler_entry ? rsi : rdx); |
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307 Register temp2 = rdi; |
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308 Register temp3 = rax; |
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309 if (for_compiler_entry) { |
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310 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment"); |
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311 assert_different_registers(temp1, rcx, rdx); |
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312 assert_different_registers(temp2, rcx, rdx); |
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313 assert_different_registers(temp3, rcx, rdx); |
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314 } |
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315 #endif |
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316 else { |
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317 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP |
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318 } |
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319 assert_different_registers(temp1, temp2, temp3, receiver_reg); |
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320 assert_different_registers(temp1, temp2, temp3, 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, rbx_method, temp1, 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(java_lang_invoke_MemberName), |
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331 "MemberName required for invokeVirtual etc."); |
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332 } |
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333 |
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334 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes())); |
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335 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes())); |
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336 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())); |
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337 Address vmtarget_method( rbx_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())); |
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338 |
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339 Register temp1_recv_klass = temp1; |
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340 if (iid != vmIntrinsics::_linkToStatic) { |
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341 __ verify_oop(receiver_reg); |
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342 if (iid == vmIntrinsics::_linkToSpecial) { |
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343 // Don't actually load the klass; just null-check the receiver. |
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344 __ null_check(receiver_reg); |
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345 } else { |
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346 // load receiver klass itself |
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347 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes()); |
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348 __ load_klass(temp1_recv_klass, receiver_reg); |
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349 __ verify_klass_ptr(temp1_recv_klass); |
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350 } |
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351 BLOCK_COMMENT("check_receiver {"); |
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352 // The receiver for the MemberName must be in receiver_reg. |
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353 // Check the receiver against the MemberName.clazz |
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354 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) { |
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355 // Did not load it above... |
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356 __ load_klass(temp1_recv_klass, receiver_reg); |
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357 __ verify_klass_ptr(temp1_recv_klass); |
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358 } |
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359 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) { |
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360 Label L_ok; |
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361 Register temp2_defc = temp2; |
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362 __ load_heap_oop(temp2_defc, member_clazz); |
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363 load_klass_from_Class(_masm, temp2_defc); |
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364 __ verify_klass_ptr(temp2_defc); |
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365 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok); |
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366 // If we get here, the type check failed! |
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367 __ STOP("receiver class disagrees with MemberName.clazz"); |
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368 __ bind(L_ok); |
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369 } |
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370 BLOCK_COMMENT("} check_receiver"); |
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371 } |
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372 if (iid == vmIntrinsics::_linkToSpecial || |
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373 iid == vmIntrinsics::_linkToStatic) { |
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374 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass |
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375 } |
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376 |
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377 // Live registers at this point: |
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378 // member_reg - MemberName that was the trailing argument |
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379 // temp1_recv_klass - klass of stacked receiver, if needed |
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380 // rsi/r13 - interpreter linkage (if interpreted) |
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381 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled) |
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382 |
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383 Label L_incompatible_class_change_error; |
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384 switch (iid) { |
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385 case vmIntrinsics::_linkToSpecial: |
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386 if (VerifyMethodHandles) { |
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387 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3); |
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388 } |
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389 __ load_heap_oop(rbx_method, member_vmtarget); |
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390 __ movptr(rbx_method, vmtarget_method); |
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391 break; |
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392 |
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393 case vmIntrinsics::_linkToStatic: |
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394 if (VerifyMethodHandles) { |
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395 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3); |
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396 } |
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397 __ load_heap_oop(rbx_method, member_vmtarget); |
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398 __ movptr(rbx_method, vmtarget_method); |
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399 break; |
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400 |
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401 case vmIntrinsics::_linkToVirtual: |
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402 { |
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403 // same as TemplateTable::invokevirtual, |
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404 // minus the CP setup and profiling: |
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405 |
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406 if (VerifyMethodHandles) { |
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407 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3); |
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408 } |
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409 |
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410 // pick out the vtable index from the MemberName, and then we can discard it: |
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411 Register temp2_index = temp2; |
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412 __ movptr(temp2_index, member_vmindex); |
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413 |
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414 if (VerifyMethodHandles) { |
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415 Label L_index_ok; |
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416 __ cmpl(temp2_index, 0); |
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417 __ jcc(Assembler::greaterEqual, 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, rbx_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, temp3); |
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436 } |
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437 |
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438 Register temp3_intf = temp3; |
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439 __ load_heap_oop(temp3_intf, member_clazz); |
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440 load_klass_from_Class(_masm, temp3_intf); |
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441 __ verify_klass_ptr(temp3_intf); |
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442 |
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443 Register rbx_index = rbx_method; |
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444 __ movptr(rbx_index, member_vmindex); |
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445 if (VerifyMethodHandles) { |
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446 Label L; |
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447 __ cmpl(rbx_index, 0); |
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448 __ jcc(Assembler::greaterEqual, L); |
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449 __ STOP("invalid vtable index for MH.invokeInterface"); |
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450 __ bind(L); |
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451 } |
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452 |
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453 // given intf, index, and recv klass, dispatch to the implementation method |
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454 __ lookup_interface_method(temp1_recv_klass, temp3_intf, |
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455 // note: next two args must be the same: |
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456 rbx_index, rbx_method, |
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457 temp2, |
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458 L_incompatible_class_change_error); |
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459 break; |
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460 } |
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461 |
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462 default: |
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463 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); |
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464 break; |
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465 } |
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466 |
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467 // Live at this point: |
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468 // rbx_method |
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469 // rsi/r13 (if interpreted) |
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470 |
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471 // After figuring out which concrete method to call, jump into it. |
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472 // Note that this works in the interpreter with no data motion. |
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473 // But the compiled version will require that rcx_recv be shifted out. |
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474 __ verify_method_ptr(rbx_method); |
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475 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry); |
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476 |
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477 if (iid == vmIntrinsics::_linkToInterface) { |
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478 __ bind(L_incompatible_class_change_error); |
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479 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
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480 } |
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481 } |
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482 } |
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483 |
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484 #ifndef PRODUCT |
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485 void trace_method_handle_stub(const char* adaptername, |
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486 oop mh, |
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487 intptr_t* saved_regs, |
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488 intptr_t* entry_sp) { |
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489 // called as a leaf from native code: do not block the JVM! |
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490 bool has_mh = (strstr(adaptername, "/static") == NULL && |
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491 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH |
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492 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx"; |
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493 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT, |
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494 adaptername, mh_reg_name, |
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495 p2i(mh), p2i(entry_sp)); |
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496 |
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497 if (Verbose) { |
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498 tty->print_cr("Registers:"); |
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499 const int saved_regs_count = RegisterImpl::number_of_registers; |
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500 for (int i = 0; i < saved_regs_count; i++) { |
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501 Register r = as_Register(i); |
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502 // The registers are stored in reverse order on the stack (by pusha). |
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503 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]); |
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504 if ((i + 1) % 4 == 0) { |
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505 tty->cr(); |
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506 } else { |
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507 tty->print(", "); |
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508 } |
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509 } |
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510 tty->cr(); |
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511 |
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512 { |
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513 // dumping last frame with frame::describe |
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514 |
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515 JavaThread* p = JavaThread::active(); |
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516 |
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517 ResourceMark rm; |
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518 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here |
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519 FrameValues values; |
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520 |
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521 // Note: We want to allow trace_method_handle from any call site. |
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522 // While trace_method_handle creates a frame, it may be entered |
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523 // without a PC on the stack top (e.g. not just after a call). |
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524 // Walking that frame could lead to failures due to that invalid PC. |
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525 // => carefully detect that frame when doing the stack walking |
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526 |
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527 // Current C frame |
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528 frame cur_frame = os::current_frame(); |
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529 |
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530 // Robust search of trace_calling_frame (independant of inlining). |
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531 // Assumes saved_regs comes from a pusha in the trace_calling_frame. |
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532 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?"); |
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533 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame); |
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534 while (trace_calling_frame.fp() < saved_regs) { |
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535 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame); |
|
536 } |
|
537 |
|
538 // safely create a frame and call frame::describe |
|
539 intptr_t *dump_sp = trace_calling_frame.sender_sp(); |
|
540 intptr_t *dump_fp = trace_calling_frame.link(); |
|
541 |
|
542 bool walkable = has_mh; // whether the traced frame shoud be walkable |
|
543 |
|
544 if (walkable) { |
|
545 // The previous definition of walkable may have to be refined |
|
546 // if new call sites cause the next frame constructor to start |
|
547 // failing. Alternatively, frame constructors could be |
|
548 // modified to support the current or future non walkable |
|
549 // frames (but this is more intrusive and is not considered as |
|
550 // part of this RFE, which will instead use a simpler output). |
|
551 frame dump_frame = frame(dump_sp, dump_fp); |
|
552 dump_frame.describe(values, 1); |
|
553 } else { |
|
554 // Stack may not be walkable (invalid PC above FP): |
|
555 // Add descriptions without building a Java frame to avoid issues |
|
556 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>"); |
|
557 values.describe(-1, dump_sp, "sp for #1"); |
|
558 } |
|
559 values.describe(-1, entry_sp, "raw top of stack"); |
|
560 |
|
561 tty->print_cr("Stack layout:"); |
|
562 values.print(p); |
|
563 } |
|
564 if (has_mh && oopDesc::is_oop(mh)) { |
|
565 mh->print(); |
|
566 if (java_lang_invoke_MethodHandle::is_instance(mh)) { |
|
567 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) |
|
568 java_lang_invoke_MethodHandle::form(mh)->print(); |
|
569 } |
|
570 } |
|
571 } |
|
572 } |
|
573 |
|
574 // The stub wraps the arguments in a struct on the stack to avoid |
|
575 // dealing with the different calling conventions for passing 6 |
|
576 // arguments. |
|
577 struct MethodHandleStubArguments { |
|
578 const char* adaptername; |
|
579 oopDesc* mh; |
|
580 intptr_t* saved_regs; |
|
581 intptr_t* entry_sp; |
|
582 }; |
|
583 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) { |
|
584 trace_method_handle_stub(args->adaptername, |
|
585 args->mh, |
|
586 args->saved_regs, |
|
587 args->entry_sp); |
|
588 } |
|
589 |
|
590 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) { |
|
591 if (!TraceMethodHandles) return; |
|
592 BLOCK_COMMENT("trace_method_handle {"); |
|
593 __ enter(); |
|
594 __ andptr(rsp, -16); // align stack if needed for FPU state |
|
595 __ pusha(); |
|
596 __ mov(rbx, rsp); // for retreiving saved_regs |
|
597 // Note: saved_regs must be in the entered frame for the |
|
598 // robust stack walking implemented in trace_method_handle_stub. |
|
599 |
|
600 // save FP result, valid at some call sites (adapter_opt_return_float, ...) |
|
601 __ increment(rsp, -2 * wordSize); |
|
602 if (UseSSE >= 2) { |
|
603 __ movdbl(Address(rsp, 0), xmm0); |
|
604 } else if (UseSSE == 1) { |
|
605 __ movflt(Address(rsp, 0), xmm0); |
|
606 } else { |
|
607 __ fst_d(Address(rsp, 0)); |
|
608 } |
|
609 |
|
610 // Incoming state: |
|
611 // rcx: method handle |
|
612 // |
|
613 // To avoid calling convention issues, build a record on the stack |
|
614 // and pass the pointer to that instead. |
|
615 __ push(rbp); // entry_sp (with extra align space) |
|
616 __ push(rbx); // pusha saved_regs |
|
617 __ push(rcx); // mh |
|
618 __ push(rcx); // slot for adaptername |
|
619 __ movptr(Address(rsp, 0), (intptr_t) adaptername); |
|
620 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp); |
|
621 __ increment(rsp, sizeof(MethodHandleStubArguments)); |
|
622 |
|
623 if (UseSSE >= 2) { |
|
624 __ movdbl(xmm0, Address(rsp, 0)); |
|
625 } else if (UseSSE == 1) { |
|
626 __ movflt(xmm0, Address(rsp, 0)); |
|
627 } else { |
|
628 __ fld_d(Address(rsp, 0)); |
|
629 } |
|
630 __ increment(rsp, 2 * wordSize); |
|
631 |
|
632 __ popa(); |
|
633 __ leave(); |
|
634 BLOCK_COMMENT("} trace_method_handle"); |
|
635 } |
|
636 #endif //PRODUCT |