1 /* 2 * Copyright (c) 2004, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "asm/macroAssembler.hpp" 27 #include "gc/shared/barrierSet.hpp" 28 #include "gc/shared/barrierSetAssembler.hpp" 29 #include "memory/resourceArea.hpp" 30 #include "prims/jniFastGetField.hpp" 31 #include "prims/jvm_misc.hpp" 32 #include "runtime/safepoint.hpp" 33 34 #define __ masm-> 35 36 #define BUFFER_SIZE 30*wordSize 37 38 // Common register usage: 39 // rax/xmm0: result 40 // c_rarg0: jni env 41 // c_rarg1: obj 42 // c_rarg2: jfield id 43 44 static const Register rtmp = rax; // r8 == c_rarg2 on Windows 45 static const Register robj = r9; 46 static const Register roffset = r10; 47 static const Register rcounter = r11; 48 49 // Warning: do not use rip relative addressing after the first counter load 50 // since that may scratch r10! 51 52 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) { 53 const char *name = NULL; 54 switch (type) { 55 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break; 56 case T_BYTE: name = "jni_fast_GetByteField"; break; 57 case T_CHAR: name = "jni_fast_GetCharField"; break; 58 case T_SHORT: name = "jni_fast_GetShortField"; break; 59 case T_INT: name = "jni_fast_GetIntField"; break; 60 case T_LONG: name = "jni_fast_GetLongField"; break; 61 default: ShouldNotReachHere(); 62 } 63 ResourceMark rm; 64 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE); 65 CodeBuffer cbuf(blob); 66 MacroAssembler* masm = new MacroAssembler(&cbuf); 67 address fast_entry = __ pc(); 68 69 Label slow; 70 71 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr()); 72 __ mov32 (rcounter, counter); 73 __ mov (robj, c_rarg1); 74 __ testb (rcounter, 1); 75 __ jcc (Assembler::notZero, slow); 76 77 if (JvmtiExport::can_post_field_access()) { 78 // Check to see if a field access watch has been set before we 79 // take the fast path. 80 assert_different_registers(rscratch1, robj, rcounter); // cmp32 clobbers rscratch1! 81 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0); 82 __ jcc(Assembler::notZero, slow); 83 } 84 85 __ mov (roffset, c_rarg2); 86 __ shrptr(roffset, 2); // offset 87 88 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native. 89 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 90 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow); 91 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);) 92 93 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small"); 94 speculative_load_pclist[count] = __ pc(); 95 switch (type) { 96 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break; 97 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break; 98 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break; 99 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break; 100 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break; 101 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break; 102 default: ShouldNotReachHere(); 103 } 104 105 __ cmp32 (rcounter, counter); 106 __ jcc (Assembler::notEqual, slow); 107 108 __ ret (0); 109 110 slowcase_entry_pclist[count++] = __ pc(); 111 __ bind (slow); 112 address slow_case_addr = NULL; 113 switch (type) { 114 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break; 115 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break; 116 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break; 117 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break; 118 case T_INT: slow_case_addr = jni_GetIntField_addr(); break; 119 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break; 120 default: break; 121 } 122 // tail call 123 __ jump (ExternalAddress(slow_case_addr)); 124 125 __ flush (); 126 127 return fast_entry; 128 } 129 130 address JNI_FastGetField::generate_fast_get_boolean_field() { 131 return generate_fast_get_int_field0(T_BOOLEAN); 132 } 133 134 address JNI_FastGetField::generate_fast_get_byte_field() { 135 return generate_fast_get_int_field0(T_BYTE); 136 } 137 138 address JNI_FastGetField::generate_fast_get_char_field() { 139 return generate_fast_get_int_field0(T_CHAR); 140 } 141 142 address JNI_FastGetField::generate_fast_get_short_field() { 143 return generate_fast_get_int_field0(T_SHORT); 144 } 145 146 address JNI_FastGetField::generate_fast_get_int_field() { 147 return generate_fast_get_int_field0(T_INT); 148 } 149 150 address JNI_FastGetField::generate_fast_get_long_field() { 151 return generate_fast_get_int_field0(T_LONG); 152 } 153 154 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) { 155 const char *name = NULL; 156 switch (type) { 157 case T_FLOAT: name = "jni_fast_GetFloatField"; break; 158 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break; 159 default: ShouldNotReachHere(); 160 } 161 ResourceMark rm; 162 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE); 163 CodeBuffer cbuf(blob); 164 MacroAssembler* masm = new MacroAssembler(&cbuf); 165 address fast_entry = __ pc(); 166 167 Label slow; 168 169 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr()); 170 __ mov32 (rcounter, counter); 171 __ mov (robj, c_rarg1); 172 __ testb (rcounter, 1); 173 __ jcc (Assembler::notZero, slow); 174 175 if (JvmtiExport::can_post_field_access()) { 176 // Check to see if a field access watch has been set before we 177 // take the fast path. 178 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0); 179 __ jcc(Assembler::notZero, slow); 180 } 181 182 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native. 183 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 184 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow); 185 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);) 186 187 __ mov (roffset, c_rarg2); 188 __ shrptr(roffset, 2); // offset 189 190 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small"); 191 speculative_load_pclist[count] = __ pc(); 192 switch (type) { 193 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break; 194 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break; 195 default: ShouldNotReachHere(); 196 } 197 __ cmp32 (rcounter, counter); 198 __ jcc (Assembler::notEqual, slow); 199 200 __ ret (0); 201 202 slowcase_entry_pclist[count++] = __ pc(); 203 __ bind (slow); 204 address slow_case_addr = NULL; 205 switch (type) { 206 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break; 207 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break; 208 default: break; 209 } 210 // tail call 211 __ jump (ExternalAddress(slow_case_addr)); 212 213 __ flush (); 214 215 return fast_entry; 216 } 217 218 address JNI_FastGetField::generate_fast_get_float_field() { 219 return generate_fast_get_float_field0(T_FLOAT); 220 } 221 222 address JNI_FastGetField::generate_fast_get_double_field() { 223 return generate_fast_get_float_field0(T_DOUBLE); 224 }