1 /* 2 * Copyright (c) 2004, 2020, 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 "code/codeBlob.hpp" 28 #include "gc/shared/barrierSet.hpp" 29 #include "gc/shared/barrierSetAssembler.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "prims/jniFastGetField.hpp" 32 #include "prims/jvm_misc.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "runtime/safepoint.hpp" 35 36 #define __ masm-> 37 38 #define BUFFER_SIZE 30*wordSize 39 40 // Common register usage: 41 // rax/xmm0: result 42 // c_rarg0: jni env 43 // c_rarg1: obj 44 // c_rarg2: jfield id 45 46 static const Register rtmp = rax; // r8 == c_rarg2 on Windows 47 static const Register robj = r9; 48 static const Register roffset = r10; 49 static const Register rcounter = r11; 50 51 // Warning: do not use rip relative addressing after the first counter load 52 // since that may scratch r10! 53 54 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) { 55 const char *name = NULL; 56 switch (type) { 57 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break; 58 case T_BYTE: name = "jni_fast_GetByteField"; break; 59 case T_CHAR: name = "jni_fast_GetCharField"; break; 60 case T_SHORT: name = "jni_fast_GetShortField"; break; 61 case T_INT: name = "jni_fast_GetIntField"; break; 62 case T_LONG: name = "jni_fast_GetLongField"; break; 63 default: ShouldNotReachHere(); 64 } 65 ResourceMark rm; 66 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE); 67 CodeBuffer cbuf(blob); 68 MacroAssembler* masm = new MacroAssembler(&cbuf); 69 address fast_entry = __ pc(); 70 71 Label slow; 72 73 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr()); 74 __ mov32 (rcounter, counter); 75 __ mov (robj, c_rarg1); 76 __ testb (rcounter, 1); 77 __ jcc (Assembler::notZero, slow); 78 79 if (JvmtiExport::can_post_field_access()) { 80 // Check to see if a field access watch has been set before we 81 // take the fast path. 82 assert_different_registers(rscratch1, robj, rcounter); // cmp32 clobbers rscratch1! 83 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0); 84 __ jcc(Assembler::notZero, slow); 85 } 86 87 __ mov (roffset, c_rarg2); 88 __ shrptr(roffset, 2); // offset 89 90 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native. 91 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 92 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow); 93 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);) 94 95 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small"); 96 speculative_load_pclist[count] = __ pc(); 97 switch (type) { 98 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break; 99 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break; 100 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break; 101 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break; 102 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break; 103 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break; 104 default: ShouldNotReachHere(); 105 } 106 107 __ cmp32 (rcounter, counter); 108 __ jcc (Assembler::notEqual, slow); 109 110 __ ret (0); 111 112 slowcase_entry_pclist[count++] = __ pc(); 113 __ bind (slow); 114 address slow_case_addr = NULL; 115 switch (type) { 116 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break; 117 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break; 118 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break; 119 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break; 120 case T_INT: slow_case_addr = jni_GetIntField_addr(); break; 121 case T_LONG: slow_case_addr = jni_GetLongField_addr(); break; 122 default: break; 123 } 124 // tail call 125 __ jump (ExternalAddress(slow_case_addr)); 126 127 __ flush (); 128 129 return fast_entry; 130 } 131 132 address JNI_FastGetField::generate_fast_get_boolean_field() { 133 return generate_fast_get_int_field0(T_BOOLEAN); 134 } 135 136 address JNI_FastGetField::generate_fast_get_byte_field() { 137 return generate_fast_get_int_field0(T_BYTE); 138 } 139 140 address JNI_FastGetField::generate_fast_get_char_field() { 141 return generate_fast_get_int_field0(T_CHAR); 142 } 143 144 address JNI_FastGetField::generate_fast_get_short_field() { 145 return generate_fast_get_int_field0(T_SHORT); 146 } 147 148 address JNI_FastGetField::generate_fast_get_int_field() { 149 return generate_fast_get_int_field0(T_INT); 150 } 151 152 address JNI_FastGetField::generate_fast_get_long_field() { 153 return generate_fast_get_int_field0(T_LONG); 154 } 155 156 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) { 157 const char *name = NULL; 158 switch (type) { 159 case T_FLOAT: name = "jni_fast_GetFloatField"; break; 160 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break; 161 default: ShouldNotReachHere(); 162 } 163 ResourceMark rm; 164 BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE); 165 CodeBuffer cbuf(blob); 166 MacroAssembler* masm = new MacroAssembler(&cbuf); 167 address fast_entry = __ pc(); 168 169 Label slow; 170 171 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr()); 172 __ mov32 (rcounter, counter); 173 __ mov (robj, c_rarg1); 174 __ testb (rcounter, 1); 175 __ jcc (Assembler::notZero, slow); 176 177 if (JvmtiExport::can_post_field_access()) { 178 // Check to see if a field access watch has been set before we 179 // take the fast path. 180 __ cmp32(ExternalAddress((address) JvmtiExport::get_field_access_count_addr()), 0); 181 __ jcc(Assembler::notZero, slow); 182 } 183 184 // Both robj and rtmp are clobbered by try_resolve_jobject_in_native. 185 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); 186 bs->try_resolve_jobject_in_native(masm, /* jni_env */ c_rarg0, robj, rtmp, slow); 187 DEBUG_ONLY(__ movl(rtmp, 0xDEADC0DE);) 188 189 __ mov (roffset, c_rarg2); 190 __ shrptr(roffset, 2); // offset 191 192 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small"); 193 speculative_load_pclist[count] = __ pc(); 194 switch (type) { 195 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break; 196 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break; 197 default: ShouldNotReachHere(); 198 } 199 __ cmp32 (rcounter, counter); 200 __ jcc (Assembler::notEqual, slow); 201 202 __ ret (0); 203 204 slowcase_entry_pclist[count++] = __ pc(); 205 __ bind (slow); 206 address slow_case_addr = NULL; 207 switch (type) { 208 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break; 209 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break; 210 default: break; 211 } 212 // tail call 213 __ jump (ExternalAddress(slow_case_addr)); 214 215 __ flush (); 216 217 return fast_entry; 218 } 219 220 address JNI_FastGetField::generate_fast_get_float_field() { 221 return generate_fast_get_float_field0(T_FLOAT); 222 } 223 224 address JNI_FastGetField::generate_fast_get_double_field() { 225 return generate_fast_get_float_field0(T_DOUBLE); 226 }