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1 /*
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2 * Copyright 1997-2002 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 // Base class for different kinds of abstractions working
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26 // relative to an objects 'this' pointer.
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27
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28 class ThisRelativeObj VALUE_OBJ_CLASS_SPEC {
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29 private:
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30 int sign_extend (int x, int size) const { const int s = (BytesPerInt - size)*BitsPerByte; return (x << s) >> s; }
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31
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32 public:
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33 // Address computation
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34 address addr_at (int offset) const { return (address)this + offset; }
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35 address aligned_addr_at (int offset) const { return (address)round_to((intptr_t)addr_at(offset), jintSize); }
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36 int aligned_offset (int offset) const { return aligned_addr_at(offset) - addr_at(0); }
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37
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38 // Java unsigned accessors (using Java spec byte ordering)
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39 int java_byte_at (int offset) const { return *(jubyte*)addr_at(offset); }
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40 int java_hwrd_at (int offset) const { return java_byte_at(offset) << (1 * BitsPerByte) | java_byte_at(offset + 1); }
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41 int java_word_at (int offset) const { return java_hwrd_at(offset) << (2 * BitsPerByte) | java_hwrd_at(offset + 2); }
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42
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43 // Java signed accessors (using Java spec byte ordering)
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44 int java_signed_byte_at(int offset) const { return sign_extend(java_byte_at(offset), 1); }
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45 int java_signed_hwrd_at(int offset) const { return sign_extend(java_hwrd_at(offset), 2); }
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46 int java_signed_word_at(int offset) const { return java_word_at(offset) ; }
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47
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48 // Fast accessors (using the machine's natural byte ordering)
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49 int fast_byte_at (int offset) const { return *(jubyte *)addr_at(offset); }
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50 int fast_hwrd_at (int offset) const { return *(jushort*)addr_at(offset); }
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51 int fast_word_at (int offset) const { return *(juint *)addr_at(offset); }
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52
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53 // Fast signed accessors (using the machine's natural byte ordering)
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54 int fast_signed_byte_at(int offset) const { return *(jbyte *)addr_at(offset); }
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55 int fast_signed_hwrd_at(int offset) const { return *(jshort*)addr_at(offset); }
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56 int fast_signed_word_at(int offset) const { return *(jint *)addr_at(offset); }
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57
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58 // Fast manipulators (using the machine's natural byte ordering)
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59 void set_fast_byte_at (int offset, int x) const { *(jbyte *)addr_at(offset) = (jbyte )x; }
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60 void set_fast_hwrd_at (int offset, int x) const { *(jshort*)addr_at(offset) = (jshort)x; }
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61 void set_fast_word_at (int offset, int x) const { *(jint *)addr_at(offset) = (jint )x; }
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62 };
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63
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64
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65 // The base class for different kinds of bytecode abstractions.
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66 // Provides the primitive operations to manipulate code relative
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67 // to an objects 'this' pointer.
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68 //
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69 // Note: Even though it seems that the fast_index & set_fast_index
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70 // functions are machine specific, they're not. They only use
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71 // the natural way to store a 16bit index on a given machine,
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72 // independent of the particular byte ordering. Since all other
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73 // places in the system that refer to these indices use the
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74 // same method (the natural byte ordering on the platform)
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75 // this will always work and be machine-independent).
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76
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77 class Bytecode: public ThisRelativeObj {
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78 protected:
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79 u_char byte_at(int offset) const { return *addr_at(offset); }
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80 bool check_must_rewrite() const;
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81
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82 public:
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83 // Attributes
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84 address bcp() const { return addr_at(0); }
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85 address next_bcp() const { return addr_at(0) + Bytecodes::length_at(bcp()); }
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86
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87 Bytecodes::Code code() const { return Bytecodes::code_at(addr_at(0)); }
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88 Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); }
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89 bool must_rewrite() const { return Bytecodes::can_rewrite(code()) && check_must_rewrite(); }
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90 bool is_active_breakpoint() const { return Bytecodes::is_active_breakpoint_at(bcp()); }
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91
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92 int one_byte_index() const { return byte_at(1); }
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93 int two_byte_index() const { return (byte_at(1) << 8) + byte_at(2); }
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94 int offset() const { return (two_byte_index() << 16) >> 16; }
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95 address destination() const { return bcp() + offset(); }
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96 int fast_index() const { return Bytes::get_native_u2(addr_at(1)); }
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97
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98 // Attribute modification
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99 void set_code(Bytecodes::Code code);
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100 void set_fast_index(int i);
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101
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102 // Creation
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103 inline friend Bytecode* Bytecode_at(address bcp);
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104 };
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105
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106 inline Bytecode* Bytecode_at(address bcp) {
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107 return (Bytecode*)bcp;
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108 }
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109
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110
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111 // Abstractions for lookupswitch bytecode
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112
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113 class LookupswitchPair: ThisRelativeObj {
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114 private:
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115 int _match;
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116 int _offset;
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117
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118 public:
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119 int match() const { return java_signed_word_at(0 * jintSize); }
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120 int offset() const { return java_signed_word_at(1 * jintSize); }
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121 };
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122
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123
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124 class Bytecode_lookupswitch: public Bytecode {
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125 public:
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126 void verify() const PRODUCT_RETURN;
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127
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128 // Attributes
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129 int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); }
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130 int number_of_pairs() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); }
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131 LookupswitchPair* pair_at(int i) const { assert(0 <= i && i < number_of_pairs(), "pair index out of bounds");
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132 return (LookupswitchPair*)aligned_addr_at(1 + (1 + i)*2*jintSize); }
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133 // Creation
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134 inline friend Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp);
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135 };
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136
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137 inline Bytecode_lookupswitch* Bytecode_lookupswitch_at(address bcp) {
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138 Bytecode_lookupswitch* b = (Bytecode_lookupswitch*)bcp;
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139 debug_only(b->verify());
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140 return b;
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141 }
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142
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143
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144 class Bytecode_tableswitch: public Bytecode {
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145 public:
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146 void verify() const PRODUCT_RETURN;
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147
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148 // Attributes
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149 int default_offset() const { return java_signed_word_at(aligned_offset(1 + 0*jintSize)); }
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150 int low_key() const { return java_signed_word_at(aligned_offset(1 + 1*jintSize)); }
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151 int high_key() const { return java_signed_word_at(aligned_offset(1 + 2*jintSize)); }
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152 int dest_offset_at(int i) const;
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153 int length() { return high_key()-low_key()+1; }
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154
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155 // Creation
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156 inline friend Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp);
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157 };
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158
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159 inline Bytecode_tableswitch* Bytecode_tableswitch_at(address bcp) {
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160 Bytecode_tableswitch* b = (Bytecode_tableswitch*)bcp;
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161 debug_only(b->verify());
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162 return b;
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163 }
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164
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165
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166 // Abstraction for invoke_{virtual, static, interface, special}
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167
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168 class Bytecode_invoke: public ResourceObj {
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169 protected:
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170 methodHandle _method; // method containing the bytecode
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171 int _bci; // position of the bytecode
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172
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173 Bytecode_invoke(methodHandle method, int bci) : _method(method), _bci(bci) {}
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174
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175 public:
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176 void verify() const;
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177
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178 // Attributes
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179 methodHandle method() const { return _method; }
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180 int bci() const { return _bci; }
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181 address bcp() const { return _method->bcp_from(bci()); }
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182
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183 int index() const; // the constant pool index for the invoke
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184 symbolOop name() const; // returns the name of the invoked method
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185 symbolOop signature() const; // returns the signature of the invoked method
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186 BasicType result_type(Thread *thread) const; // returns the result type of the invoke
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187
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188 Bytecodes::Code code() const { return Bytecodes::code_at(bcp(), _method()); }
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189 Bytecodes::Code adjusted_invoke_code() const { return Bytecodes::java_code(code()); }
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190
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191 methodHandle static_target(TRAPS); // "specified" method (from constant pool)
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192
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193 // Testers
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194 bool is_invokeinterface() const { return adjusted_invoke_code() == Bytecodes::_invokeinterface; }
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195 bool is_invokevirtual() const { return adjusted_invoke_code() == Bytecodes::_invokevirtual; }
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196 bool is_invokestatic() const { return adjusted_invoke_code() == Bytecodes::_invokestatic; }
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197 bool is_invokespecial() const { return adjusted_invoke_code() == Bytecodes::_invokespecial; }
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198
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199 bool is_valid() const { return is_invokeinterface() ||
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200 is_invokevirtual() ||
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201 is_invokestatic() ||
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202 is_invokespecial(); }
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203
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204 // Creation
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205 inline friend Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci);
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206
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207 // Like Bytecode_invoke_at. Instead it returns NULL if the bci is not at an invoke.
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208 inline friend Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci);
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209 };
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210
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211 inline Bytecode_invoke* Bytecode_invoke_at(methodHandle method, int bci) {
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212 Bytecode_invoke* b = new Bytecode_invoke(method, bci);
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213 debug_only(b->verify());
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214 return b;
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215 }
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216
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217 inline Bytecode_invoke* Bytecode_invoke_at_check(methodHandle method, int bci) {
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218 Bytecode_invoke* b = new Bytecode_invoke(method, bci);
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219 return b->is_valid() ? b : NULL;
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220 }
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221
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222
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223 // Abstraction for all field accesses (put/get field/static_
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224 class Bytecode_field: public Bytecode {
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225 public:
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226 void verify() const;
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227
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228 int index() const;
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229 bool is_static() const;
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230
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231 // Creation
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232 inline friend Bytecode_field* Bytecode_field_at(const methodOop method, address bcp);
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233 };
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234
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235 inline Bytecode_field* Bytecode_field_at(const methodOop method, address bcp) {
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236 Bytecode_field* b = (Bytecode_field*)bcp;
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237 debug_only(b->verify());
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238 return b;
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239 }
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240
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241
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242 // Abstraction for {get,put}static
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243
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244 class Bytecode_static: public Bytecode {
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245 public:
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246 void verify() const;
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247
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248 // Returns the result type of the send by inspecting the field ref
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249 BasicType result_type(methodOop method) const;
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250
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251 // Creation
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252 inline friend Bytecode_static* Bytecode_static_at(const methodOop method, address bcp);
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253 };
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254
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255 inline Bytecode_static* Bytecode_static_at(const methodOop method, address bcp) {
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256 Bytecode_static* b = (Bytecode_static*)bcp;
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257 debug_only(b->verify());
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258 return b;
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259 }
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260
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261
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262 // Abstraction for checkcast
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263
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264 class Bytecode_checkcast: public Bytecode {
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265 public:
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266 void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }
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267
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268 // Returns index
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269 long index() const { return java_hwrd_at(1); };
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270
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271 // Creation
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272 inline friend Bytecode_checkcast* Bytecode_checkcast_at(address bcp);
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273 };
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274
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275 inline Bytecode_checkcast* Bytecode_checkcast_at(address bcp) {
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276 Bytecode_checkcast* b = (Bytecode_checkcast*)bcp;
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277 debug_only(b->verify());
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278 return b;
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279 }
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280
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281
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282 // Abstraction for instanceof
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283
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284 class Bytecode_instanceof: public Bytecode {
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285 public:
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286 void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }
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287
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288 // Returns index
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289 long index() const { return java_hwrd_at(1); };
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290
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291 // Creation
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292 inline friend Bytecode_instanceof* Bytecode_instanceof_at(address bcp);
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293 };
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294
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295 inline Bytecode_instanceof* Bytecode_instanceof_at(address bcp) {
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296 Bytecode_instanceof* b = (Bytecode_instanceof*)bcp;
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297 debug_only(b->verify());
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298 return b;
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299 }
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300
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301
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302 class Bytecode_new: public Bytecode {
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303 public:
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304 void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }
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305
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306 // Returns index
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307 long index() const { return java_hwrd_at(1); };
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308
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309 // Creation
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310 inline friend Bytecode_new* Bytecode_new_at(address bcp);
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311 };
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312
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313 inline Bytecode_new* Bytecode_new_at(address bcp) {
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314 Bytecode_new* b = (Bytecode_new*)bcp;
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315 debug_only(b->verify());
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316 return b;
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317 }
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318
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319
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320 class Bytecode_multianewarray: public Bytecode {
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321 public:
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322 void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }
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323
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324 // Returns index
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325 long index() const { return java_hwrd_at(1); };
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326
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327 // Creation
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328 inline friend Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp);
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329 };
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330
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331 inline Bytecode_multianewarray* Bytecode_multianewarray_at(address bcp) {
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332 Bytecode_multianewarray* b = (Bytecode_multianewarray*)bcp;
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333 debug_only(b->verify());
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334 return b;
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335 }
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336
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337
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338 class Bytecode_anewarray: public Bytecode {
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339 public:
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340 void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); }
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341
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342 // Returns index
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343 long index() const { return java_hwrd_at(1); };
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344
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345 // Creation
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346 inline friend Bytecode_anewarray* Bytecode_anewarray_at(address bcp);
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347 };
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348
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349 inline Bytecode_anewarray* Bytecode_anewarray_at(address bcp) {
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350 Bytecode_anewarray* b = (Bytecode_anewarray*)bcp;
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351 debug_only(b->verify());
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352 return b;
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353 }
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354
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355
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356 // Abstraction for ldc, ldc_w and ldc2_w
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357
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358 class Bytecode_loadconstant: public Bytecode {
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359 public:
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360 void verify() const {
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361 Bytecodes::Code stdc = Bytecodes::java_code(code());
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362 assert(stdc == Bytecodes::_ldc ||
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363 stdc == Bytecodes::_ldc_w ||
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364 stdc == Bytecodes::_ldc2_w, "load constant");
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365 }
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366
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367 int index() const;
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368
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369 inline friend Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp);
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370 };
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371
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372 inline Bytecode_loadconstant* Bytecode_loadconstant_at(const methodOop method, address bcp) {
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373 Bytecode_loadconstant* b = (Bytecode_loadconstant*)bcp;
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374 debug_only(b->verify());
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375 return b;
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376 }
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