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1 /*
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2 * Copyright 2004-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_jniFastGetField_x86_64.cpp.incl"
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27
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28 #define __ masm->
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29
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30 #define BUFFER_SIZE 30*wordSize
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31
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32 // Instead of issuing lfence for LoadLoad barrier, we create data dependency
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33 // between loads, which is more efficient than lfence.
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34
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35 // Common register usage:
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36 // rax/xmm0: result
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37 // c_rarg0: jni env
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38 // c_rarg1: obj
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39 // c_rarg2: jfield id
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40
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41 static const Register robj = r9;
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42 static const Register rcounter = r10;
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43 static const Register roffset = r11;
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44 static const Register rcounter_addr = r11;
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45
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46 // Warning: do not use rip relative addressing after the first counter load
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47 // since that may scratch r10!
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48
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49 address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
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50 const char *name;
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51 switch (type) {
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52 case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
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53 case T_BYTE: name = "jni_fast_GetByteField"; break;
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54 case T_CHAR: name = "jni_fast_GetCharField"; break;
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55 case T_SHORT: name = "jni_fast_GetShortField"; break;
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56 case T_INT: name = "jni_fast_GetIntField"; break;
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57 case T_LONG: name = "jni_fast_GetLongField"; break;
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58 default: ShouldNotReachHere();
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59 }
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60 ResourceMark rm;
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61 BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE);
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62 address fast_entry = b->instructions_begin();
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63 CodeBuffer cbuf(fast_entry, b->instructions_size());
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64 MacroAssembler* masm = new MacroAssembler(&cbuf);
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65
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66 Label slow;
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67
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68 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
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69 __ mov32 (rcounter, counter);
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70 __ movq (robj, c_rarg1);
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71 __ testb (rcounter, 1);
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72 __ jcc (Assembler::notZero, slow);
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73 if (os::is_MP()) {
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74 __ xorq (robj, rcounter);
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75 __ xorq (robj, rcounter); // obj, since
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76 // robj ^ rcounter ^ rcounter == robj
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77 // robj is data dependent on rcounter.
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78 }
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79 __ movq (robj, Address(robj, 0)); // *obj
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80 __ movq (roffset, c_rarg2);
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81 __ shrq (roffset, 2); // offset
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82
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83 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
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84 speculative_load_pclist[count] = __ pc();
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85 switch (type) {
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86 case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
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87 case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
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88 case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
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89 case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
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90 case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
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91 case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
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92 default: ShouldNotReachHere();
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93 }
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94
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95 if (os::is_MP()) {
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96 __ lea(rcounter_addr, counter);
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97 // ca is data dependent on rax.
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98 __ xorq (rcounter_addr, rax);
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99 __ xorq (rcounter_addr, rax);
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100 __ cmpl (rcounter, Address(rcounter_addr, 0));
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101 } else {
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102 __ cmp32 (rcounter, counter);
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103 }
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104 __ jcc (Assembler::notEqual, slow);
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105
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106 __ ret (0);
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107
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108 slowcase_entry_pclist[count++] = __ pc();
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109 __ bind (slow);
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110 address slow_case_addr;
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111 switch (type) {
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112 case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
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113 case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
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114 case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
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115 case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
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116 case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
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117 case T_LONG: slow_case_addr = jni_GetLongField_addr();
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118 }
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119 // tail call
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120 __ jump (ExternalAddress(slow_case_addr));
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121
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122 __ flush ();
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123
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124 return fast_entry;
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125 }
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126
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127 address JNI_FastGetField::generate_fast_get_boolean_field() {
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128 return generate_fast_get_int_field0(T_BOOLEAN);
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129 }
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130
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131 address JNI_FastGetField::generate_fast_get_byte_field() {
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132 return generate_fast_get_int_field0(T_BYTE);
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133 }
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134
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135 address JNI_FastGetField::generate_fast_get_char_field() {
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136 return generate_fast_get_int_field0(T_CHAR);
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137 }
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138
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139 address JNI_FastGetField::generate_fast_get_short_field() {
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140 return generate_fast_get_int_field0(T_SHORT);
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141 }
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142
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143 address JNI_FastGetField::generate_fast_get_int_field() {
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144 return generate_fast_get_int_field0(T_INT);
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145 }
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146
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147 address JNI_FastGetField::generate_fast_get_long_field() {
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148 return generate_fast_get_int_field0(T_LONG);
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149 }
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150
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151 address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
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152 const char *name;
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153 switch (type) {
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154 case T_FLOAT: name = "jni_fast_GetFloatField"; break;
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155 case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
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156 default: ShouldNotReachHere();
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157 }
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158 ResourceMark rm;
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159 BufferBlob* b = BufferBlob::create(name, BUFFER_SIZE);
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160 address fast_entry = b->instructions_begin();
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161 CodeBuffer cbuf(fast_entry, b->instructions_size());
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162 MacroAssembler* masm = new MacroAssembler(&cbuf);
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163
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164 Label slow;
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165
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166 ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
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167 __ mov32 (rcounter, counter);
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168 __ movq (robj, c_rarg1);
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169 __ testb (rcounter, 1);
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170 __ jcc (Assembler::notZero, slow);
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171 if (os::is_MP()) {
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172 __ xorq (robj, rcounter);
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173 __ xorq (robj, rcounter); // obj, since
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174 // robj ^ rcounter ^ rcounter == robj
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175 // robj is data dependent on rcounter.
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176 }
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177 __ movq (robj, Address(robj, 0)); // *obj
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178 __ movq (roffset, c_rarg2);
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179 __ shrq (roffset, 2); // offset
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180
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181 assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
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182 speculative_load_pclist[count] = __ pc();
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183 switch (type) {
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184 case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
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185 case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
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186 default: ShouldNotReachHere();
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187 }
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188
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189 if (os::is_MP()) {
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190 __ lea(rcounter_addr, counter);
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191 __ movdq (rax, xmm0);
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192 // counter address is data dependent on xmm0.
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193 __ xorq (rcounter_addr, rax);
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194 __ xorq (rcounter_addr, rax);
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195 __ cmpl (rcounter, Address(rcounter_addr, 0));
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196 } else {
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197 __ cmp32 (rcounter, counter);
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198 }
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199 __ jcc (Assembler::notEqual, slow);
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200
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201 __ ret (0);
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202
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203 slowcase_entry_pclist[count++] = __ pc();
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204 __ bind (slow);
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205 address slow_case_addr;
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206 switch (type) {
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207 case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
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208 case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr();
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209 }
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210 // tail call
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211 __ jump (ExternalAddress(slow_case_addr));
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212
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213 __ flush ();
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214
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215 return fast_entry;
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216 }
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217
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218 address JNI_FastGetField::generate_fast_get_float_field() {
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219 return generate_fast_get_float_field0(T_FLOAT);
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220 }
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221
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222 address JNI_FastGetField::generate_fast_get_double_field() {
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223 return generate_fast_get_float_field0(T_DOUBLE);
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224 }
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