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1 /*
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2 * Copyright 1997-2006 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/_vtableStubs_sparc.cpp.incl"
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27
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28 // machine-dependent part of VtableStubs: create vtableStub of correct size and
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29 // initialize its code
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30
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31 #define __ masm->
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32
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33
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34 #ifndef PRODUCT
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35 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
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36 #endif
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37
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38
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39 // Used by compiler only; may use only caller saved, non-argument registers
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40 // NOTE: %%%% if any change is made to this stub make sure that the function
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41 // pd_code_size_limit is changed to ensure the correct size for VtableStub
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42 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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43 const int sparc_code_length = VtableStub::pd_code_size_limit(true);
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44 VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index);
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45 ResourceMark rm;
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46 CodeBuffer cb(s->entry_point(), sparc_code_length);
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47 MacroAssembler* masm = new MacroAssembler(&cb);
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48
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49 #ifndef PRODUCT
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50 if (CountCompiledCalls) {
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51 Address ctr(G5, SharedRuntime::nof_megamorphic_calls_addr());
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52 __ sethi(ctr);
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53 __ ld(ctr, G3_scratch);
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54 __ inc(G3_scratch);
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55 __ st(G3_scratch, ctr);
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56 }
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57 #endif /* PRODUCT */
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58
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59 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
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60
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61 // get receiver klass
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62 address npe_addr = __ pc();
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63 __ ld_ptr(O0, oopDesc::klass_offset_in_bytes(), G3_scratch);
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64
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65 // set methodOop (in case of interpreted method), and destination address
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66 int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
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67 #ifndef PRODUCT
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68 if (DebugVtables) {
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69 Label L;
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70 // check offset vs vtable length
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71 __ ld(G3_scratch, instanceKlass::vtable_length_offset()*wordSize, G5);
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72 __ cmp(G5, vtable_index*vtableEntry::size());
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73 __ br(Assembler::greaterUnsigned, false, Assembler::pt, L);
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74 __ delayed()->nop();
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75 __ set(vtable_index, O2);
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76 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);
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77 __ bind(L);
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78 }
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79 #endif
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80 int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes();
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81 if( __ is_simm13(v_off) ) {
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82 __ ld_ptr(G3, v_off, G5_method);
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83 } else {
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84 __ set(v_off,G5);
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85 __ ld_ptr(G3, G5, G5_method);
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86 }
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87
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88 #ifndef PRODUCT
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89 if (DebugVtables) {
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90 Label L;
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91 __ br_notnull(G5_method, false, Assembler::pt, L);
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92 __ delayed()->nop();
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93 __ stop("Vtable entry is ZERO");
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94 __ bind(L);
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95 }
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96 #endif
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97
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98 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
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99 // NOTE: for vtable dispatches, the vtable entry will never be null.
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100
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101 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
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102
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103 // jump to target (either compiled code or c2iadapter)
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104 __ JMP(G3_scratch, 0);
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105 // load methodOop (in case we call c2iadapter)
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106 __ delayed()->nop();
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107
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108 masm->flush();
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109 s->set_exception_points(npe_addr, ame_addr);
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110 return s;
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111 }
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112
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113
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114 // NOTE: %%%% if any change is made to this stub make sure that the function
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115 // pd_code_size_limit is changed to ensure the correct size for VtableStub
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116 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
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117 const int sparc_code_length = VtableStub::pd_code_size_limit(false);
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118 VtableStub* s = new(sparc_code_length) VtableStub(false, vtable_index);
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119 ResourceMark rm;
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120 CodeBuffer cb(s->entry_point(), sparc_code_length);
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121 MacroAssembler* masm = new MacroAssembler(&cb);
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122
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123 Register G3_klassOop = G3_scratch;
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124 Register G5_interface = G5; // Passed in as an argument
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125 Label search;
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126
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127 // Entry arguments:
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128 // G5_interface: Interface
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129 // O0: Receiver
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130 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
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131
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132 // get receiver klass (also an implicit null-check)
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133 address npe_addr = __ pc();
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134 __ ld_ptr(O0, oopDesc::klass_offset_in_bytes(), G3_klassOop);
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135 __ verify_oop(G3_klassOop);
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136
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137 // Push a new window to get some temp registers. This chops the head of all
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138 // my 64-bit %o registers in the LION build, but this is OK because no longs
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139 // are passed in the %o registers. Instead, longs are passed in G1 and G4
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140 // and so those registers are not available here.
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141 __ save(SP,-frame::register_save_words*wordSize,SP);
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142 Register I0_receiver = I0; // Location of receiver after save
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143
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144 #ifndef PRODUCT
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145 if (CountCompiledCalls) {
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146 Address ctr(L0, SharedRuntime::nof_megamorphic_calls_addr());
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147 __ sethi(ctr);
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148 __ ld(ctr, L1);
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149 __ inc(L1);
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150 __ st(L1, ctr);
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151 }
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152 #endif /* PRODUCT */
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153
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154 // load start of itable entries into L0 register
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155 const int base = instanceKlass::vtable_start_offset() * wordSize;
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156 __ ld(Address(G3_klassOop, 0, instanceKlass::vtable_length_offset() * wordSize), L0);
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157
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158 // %%% Could store the aligned, prescaled offset in the klassoop.
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159 __ sll(L0, exact_log2(vtableEntry::size() * wordSize), L0);
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160 // see code for instanceKlass::start_of_itable!
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161 const int vtable_alignment = align_object_offset(1);
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162 assert(vtable_alignment == 1 || vtable_alignment == 2, "");
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163 const int odd_bit = vtableEntry::size() * wordSize;
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164 if (vtable_alignment == 2) {
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165 __ and3(L0, odd_bit, L1); // isolate the odd bit
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166 }
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167 __ add(G3_klassOop, L0, L0);
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168 if (vtable_alignment == 2) {
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169 __ add(L0, L1, L0); // double the odd bit, to align up
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170 }
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171
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172 // Loop over all itable entries until desired interfaceOop (G5_interface) found
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173 __ bind(search);
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174
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175 // %%%% Could load both offset and interface in one ldx, if they were
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176 // in the opposite order. This would save a load.
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177 __ ld_ptr(L0, base + itableOffsetEntry::interface_offset_in_bytes(), L1);
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178 #ifdef ASSERT
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179 Label ok;
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180 // Check that entry is non-null and an Oop
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181 __ bpr(Assembler::rc_nz, false, Assembler::pt, L1, ok);
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182 __ delayed()->nop();
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183 __ stop("null entry point found in itable's offset table");
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184 __ bind(ok);
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185 __ verify_oop(L1);
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186 #endif // ASSERT
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187
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188 __ cmp(G5_interface, L1);
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189 __ brx(Assembler::notEqual, true, Assembler::pn, search);
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190 __ delayed()->add(L0, itableOffsetEntry::size() * wordSize, L0);
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191
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192 // entry found and L0 points to it, move offset of vtable for interface into L0
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193 __ ld(L0, base + itableOffsetEntry::offset_offset_in_bytes(), L0);
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194
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195 // Compute itableMethodEntry and get methodOop(G5_method) and entrypoint(L0) for compiler
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196 const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
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197 __ add(G3_klassOop, L0, L1);
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198 __ ld_ptr(L1, method_offset, G5_method);
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199
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200 #ifndef PRODUCT
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201 if (DebugVtables) {
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202 Label L01;
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203 __ ld_ptr(L1, method_offset, G5_method);
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204 __ bpr(Assembler::rc_nz, false, Assembler::pt, G5_method, L01);
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205 __ delayed()->nop();
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206 __ stop("methodOop is null");
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207 __ bind(L01);
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208 __ verify_oop(G5_method);
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209 }
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210 #endif
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211
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212 // If the following load is through a NULL pointer, we'll take an OS
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213 // exception that should translate into an AbstractMethodError. We need the
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214 // window count to be correct at that time.
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215 __ restore(); // Restore registers BEFORE the AME point
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216
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217 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
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218 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
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219
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220 // G5_method: methodOop
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221 // O0: Receiver
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222 // G3_scratch: entry point
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223 __ JMP(G3_scratch, 0);
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224 __ delayed()->nop();
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225
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226 masm->flush();
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227 s->set_exception_points(npe_addr, ame_addr);
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228 return s;
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229 }
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230
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231
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232 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
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233 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 999;
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234 else {
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235 const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets)
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236 if (is_vtable_stub) {
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237 const int basic = 5*BytesPerInstWord; // ld;ld;ld,jmp,nop
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238 return basic + slop;
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239 } else {
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240 #ifdef ASSERT
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241 return 999;
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242 #endif // ASSERT
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243 const int basic = 17*BytesPerInstWord; // save, ld, ld, sll, and, add, add, ld, cmp, br, add, ld, add, ld, ld, jmp, restore
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244 return (basic + slop);
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245 }
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246 }
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247 }
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248
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249
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250 int VtableStub::pd_code_alignment() {
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251 // UltraSPARC cache line size is 8 instructions:
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252 const unsigned int icache_line_size = 32;
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253 return icache_line_size;
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254 }
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255
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256
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257 //Reconciliation History
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258 // 1.2 97/12/09 17:13:31 vtableStubs_i486.cpp
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259 // 1.4 98/01/21 19:18:37 vtableStubs_i486.cpp
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260 // 1.5 98/02/13 16:33:55 vtableStubs_i486.cpp
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261 // 1.7 98/03/05 17:17:28 vtableStubs_i486.cpp
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262 // 1.9 98/05/18 09:26:17 vtableStubs_i486.cpp
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263 // 1.10 98/05/26 16:28:13 vtableStubs_i486.cpp
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264 // 1.11 98/05/27 08:51:35 vtableStubs_i486.cpp
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265 // 1.12 98/06/15 15:04:12 vtableStubs_i486.cpp
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266 // 1.13 98/07/28 18:44:22 vtableStubs_i486.cpp
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267 // 1.15 98/08/28 11:31:19 vtableStubs_i486.cpp
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268 // 1.16 98/09/02 12:58:31 vtableStubs_i486.cpp
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269 // 1.17 98/09/04 12:15:52 vtableStubs_i486.cpp
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270 // 1.18 98/11/19 11:55:24 vtableStubs_i486.cpp
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271 // 1.19 99/01/12 14:57:56 vtableStubs_i486.cpp
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272 // 1.20 99/01/19 17:42:52 vtableStubs_i486.cpp
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273 // 1.22 99/01/21 10:29:25 vtableStubs_i486.cpp
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274 // 1.30 99/06/02 15:27:39 vtableStubs_i486.cpp
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275 // 1.26 99/06/24 14:25:07 vtableStubs_i486.cpp
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276 // 1.23 99/02/22 14:37:52 vtableStubs_i486.cpp
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277 // 1.28 99/06/29 18:06:17 vtableStubs_i486.cpp
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278 // 1.29 99/07/22 17:03:44 vtableStubs_i486.cpp
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279 // 1.30 99/08/11 09:33:27 vtableStubs_i486.cpp
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280 //End
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