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1 /*
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2 * Copyright 1997-2008 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/_stackValue.cpp.incl"
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27
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28 StackValue* StackValue::create_stack_value(const frame* fr, const RegisterMap* reg_map, ScopeValue* sv) {
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29 if (sv->is_location()) {
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30 // Stack or register value
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31 Location loc = ((LocationValue *)sv)->location();
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32
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33 #ifdef SPARC
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34 // %%%%% Callee-save floats will NOT be working on a Sparc until we
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35 // handle the case of a 2 floats in a single double register.
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36 assert( !(loc.is_register() && loc.type() == Location::float_in_dbl), "Sparc does not handle callee-save floats yet" );
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37 #endif // SPARC
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38
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39 // First find address of value
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40
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41 address value_addr = loc.is_register()
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42 // Value was in a callee-save register
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43 ? reg_map->location(VMRegImpl::as_VMReg(loc.register_number()))
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44 // Else value was directly saved on the stack. The frame's original stack pointer,
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45 // before any extension by its callee (due to Compiler1 linkage on SPARC), must be used.
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46 : ((address)fr->unextended_sp()) + loc.stack_offset();
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47
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48 // Then package it right depending on type
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49 // Note: the transfer of the data is thru a union that contains
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50 // an intptr_t. This is because an interpreter stack slot is
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51 // really an intptr_t. The use of a union containing an intptr_t
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52 // ensures that on a 64 bit platform we have proper alignment
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53 // and that we store the value where the interpreter will expect
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54 // to find it (i.e. proper endian). Similarly on a 32bit platform
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55 // using the intptr_t ensures that when a value is larger than
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56 // a stack slot (jlong/jdouble) that we capture the proper part
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57 // of the value for the stack slot in question.
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58 //
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59 switch( loc.type() ) {
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60 case Location::float_in_dbl: { // Holds a float in a double register?
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61 // The callee has no clue whether the register holds a float,
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62 // double or is unused. He always saves a double. Here we know
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63 // a double was saved, but we only want a float back. Narrow the
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64 // saved double to the float that the JVM wants.
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65 assert( loc.is_register(), "floats always saved to stack in 1 word" );
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66 union { intptr_t p; jfloat jf; } value;
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67 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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68 value.jf = (jfloat) *(jdouble*) value_addr;
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69 return new StackValue(value.p); // 64-bit high half is stack junk
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70 }
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71 case Location::int_in_long: { // Holds an int in a long register?
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72 // The callee has no clue whether the register holds an int,
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73 // long or is unused. He always saves a long. Here we know
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74 // a long was saved, but we only want an int back. Narrow the
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75 // saved long to the int that the JVM wants.
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76 assert( loc.is_register(), "ints always saved to stack in 1 word" );
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77 union { intptr_t p; jint ji;} value;
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78 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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79 value.ji = (jint) *(jlong*) value_addr;
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80 return new StackValue(value.p); // 64-bit high half is stack junk
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81 }
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82 #ifdef _LP64
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83 case Location::dbl:
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84 // Double value in an aligned adjacent pair
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85 return new StackValue(*(intptr_t*)value_addr);
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86 case Location::lng:
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87 // Long value in an aligned adjacent pair
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88 return new StackValue(*(intptr_t*)value_addr);
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89 case Location::narrowoop: {
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90 union { intptr_t p; narrowOop noop;} value;
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91 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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92 if (loc.is_register()) {
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93 // The callee has no clue whether the register holds an int,
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94 // long or is unused. He always saves a long. Here we know
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95 // a long was saved, but we only want an int back. Narrow the
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96 // saved long to the int that the JVM wants.
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97 value.noop = (narrowOop) *(julong*) value_addr;
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98 } else {
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99 value.noop = *(narrowOop*) value_addr;
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100 }
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101 // Decode narrowoop and wrap a handle around the oop
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102 Handle h(oopDesc::decode_heap_oop(value.noop));
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103 return new StackValue(h);
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104 }
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105 #endif
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106 case Location::oop: {
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107 Handle h(*(oop *)value_addr); // Wrap a handle around the oop
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108 return new StackValue(h);
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109 }
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110 case Location::addr: {
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111 ShouldNotReachHere(); // both C1 and C2 now inline jsrs
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112 }
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113 case Location::normal: {
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114 // Just copy all other bits straight through
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115 union { intptr_t p; jint ji;} value;
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116 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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117 value.ji = *(jint*)value_addr;
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118 return new StackValue(value.p);
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119 }
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120 case Location::invalid:
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121 return new StackValue();
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122 default:
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123 ShouldNotReachHere();
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124 }
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125
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126 } else if (sv->is_constant_int()) {
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127 // Constant int: treat same as register int.
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128 union { intptr_t p; jint ji;} value;
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129 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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130 value.ji = (jint)((ConstantIntValue*)sv)->value();
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131 return new StackValue(value.p);
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132 } else if (sv->is_constant_oop()) {
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133 // constant oop
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134 return new StackValue(((ConstantOopReadValue *)sv)->value());
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135 #ifdef _LP64
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136 } else if (sv->is_constant_double()) {
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137 // Constant double in a single stack slot
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138 union { intptr_t p; double d; } value;
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139 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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140 value.d = ((ConstantDoubleValue *)sv)->value();
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141 return new StackValue(value.p);
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142 } else if (sv->is_constant_long()) {
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143 // Constant long in a single stack slot
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144 union { intptr_t p; jlong jl; } value;
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145 value.p = (intptr_t) CONST64(0xDEADDEAFDEADDEAF);
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146 value.jl = ((ConstantLongValue *)sv)->value();
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147 return new StackValue(value.p);
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148 #endif
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149 } else if (sv->is_object()) {
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150 return new StackValue(((ObjectValue *)sv)->value());
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151 }
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152
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153 // Unknown ScopeValue type
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154 ShouldNotReachHere();
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155 return new StackValue((intptr_t) 0); // dummy
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156 }
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157
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158
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159 BasicLock* StackValue::resolve_monitor_lock(const frame* fr, Location location) {
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160 assert(location.is_stack(), "for now we only look at the stack");
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161 int word_offset = location.stack_offset() / wordSize;
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162 // (stack picture)
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163 // high: [ ] word_offset + 1
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164 // low [ ] word_offset
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165 //
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166 // sp-> [ ] 0
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167 // the word_offset is the distance from the stack pointer to the lowest address
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168 // The frame's original stack pointer, before any extension by its callee
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169 // (due to Compiler1 linkage on SPARC), must be used.
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170 return (BasicLock*) (fr->unextended_sp() + word_offset);
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171 }
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172
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173
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174 #ifndef PRODUCT
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175
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176 void StackValue::print_on(outputStream* st) const {
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177 switch(_type) {
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178 case T_INT:
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179 st->print("%d (int) %f (float) %x (hex)", *(int *)&_i, *(float *)&_i, *(int *)&_i);
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180 break;
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181
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182 case T_OBJECT:
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183 _o()->print_value_on(st);
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184 st->print(" <" INTPTR_FORMAT ">", (address)_o());
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185 break;
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186
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187 case T_CONFLICT:
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188 st->print("conflict");
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189 break;
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190
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191 default:
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192 ShouldNotReachHere();
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193 }
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194 }
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195
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196 #endif
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