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1 /*
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2 * Copyright 1998-2007 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 // CodeBlob - superclass for all entries in the CodeCache.
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26 //
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27 // Suptypes are:
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28 // nmethod : Compiled Java methods (include method that calls to native code)
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29 // RuntimeStub : Call to VM runtime methods
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30 // DeoptimizationBlob : Used for deoptimizatation
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31 // ExceptionBlob : Used for stack unrolling
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32 // SafepointBlob : Used to handle illegal instruction exceptions
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33 //
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34 //
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35 // Layout:
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36 // - header
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37 // - relocation
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38 // - instruction space
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39 // - data space
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40 class DeoptimizationBlob;
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41
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42 class CodeBlob VALUE_OBJ_CLASS_SPEC {
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43
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44 friend class VMStructs;
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45
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46 private:
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47 const char* _name;
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48 int _size; // total size of CodeBlob in bytes
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49 int _header_size; // size of header (depends on subclass)
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50 int _relocation_size; // size of relocation
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51 int _instructions_offset; // offset to where instructions region begins
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52 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
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53 // not finished setting up their frame. Beware of pc's in
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54 // that range. There is a similar range(s) on returns
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55 // which we don't detect.
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56 int _data_offset; // offset to where data region begins
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57 int _oops_offset; // offset to where embedded oop table begins (inside data)
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58 int _oops_length; // number of embedded oops
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59 int _frame_size; // size of stack frame
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60 OopMapSet* _oop_maps; // OopMap for this CodeBlob
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61 CodeComments _comments;
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62
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63 friend class OopRecorder;
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64
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65 void fix_oop_relocations(address begin, address end, bool initialize_immediates);
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66 inline void initialize_immediate_oop(oop* dest, jobject handle);
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67
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68 public:
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69 // Returns the space needed for CodeBlob
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70 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
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71
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72 // Creation
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73 // a) simple CodeBlob
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74 // frame_complete is the offset from the beginning of the instructions
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75 // to where the frame setup (from stackwalk viewpoint) is complete.
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76 CodeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
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77
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78 // b) full CodeBlob
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79 CodeBlob(
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80 const char* name,
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81 CodeBuffer* cb,
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82 int header_size,
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83 int size,
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84 int frame_complete,
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85 int frame_size,
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86 OopMapSet* oop_maps
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87 );
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88
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89 // Deletion
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90 void flush();
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91
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92 // Typing
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93 virtual bool is_buffer_blob() const { return false; }
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94 virtual bool is_nmethod() const { return false; }
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95 virtual bool is_runtime_stub() const { return false; }
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96 virtual bool is_deoptimization_stub() const { return false; }
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97 virtual bool is_uncommon_trap_stub() const { return false; }
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98 virtual bool is_exception_stub() const { return false; }
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99 virtual bool is_safepoint_stub() const { return false; }
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100 virtual bool is_adapter_blob() const { return false; }
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101
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102 virtual bool is_compiled_by_c2() const { return false; }
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103 virtual bool is_compiled_by_c1() const { return false; }
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104
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105 // Boundaries
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106 address header_begin() const { return (address) this; }
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107 address header_end() const { return ((address) this) + _header_size; };
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108 relocInfo* relocation_begin() const { return (relocInfo*) header_end(); };
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109 relocInfo* relocation_end() const { return (relocInfo*)(header_end() + _relocation_size); }
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110 address instructions_begin() const { return (address) header_begin() + _instructions_offset; }
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111 address instructions_end() const { return (address) header_begin() + _data_offset; }
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112 address data_begin() const { return (address) header_begin() + _data_offset; }
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113 address data_end() const { return (address) header_begin() + _size; }
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114 oop* oops_begin() const { return (oop*) (header_begin() + _oops_offset); }
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115 oop* oops_end() const { return oops_begin() + _oops_length; }
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116
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117 // Offsets
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118 int relocation_offset() const { return _header_size; }
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119 int instructions_offset() const { return _instructions_offset; }
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120 int data_offset() const { return _data_offset; }
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121 int oops_offset() const { return _oops_offset; }
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122
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123 // Sizes
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124 int size() const { return _size; }
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125 int header_size() const { return _header_size; }
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126 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); }
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127 int instructions_size() const { return instructions_end() - instructions_begin(); }
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128 int data_size() const { return data_end() - data_begin(); }
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129 int oops_size() const { return (address) oops_end() - (address) oops_begin(); }
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130
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131 // Containment
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132 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
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133 bool relocation_contains(relocInfo* addr) const{ return relocation_begin() <= addr && addr < relocation_end(); }
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134 bool instructions_contains(address addr) const { return instructions_begin() <= addr && addr < instructions_end(); }
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135 bool data_contains(address addr) const { return data_begin() <= addr && addr < data_end(); }
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136 bool oops_contains(oop* addr) const { return oops_begin() <= addr && addr < oops_end(); }
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137 bool contains(address addr) const { return instructions_contains(addr); }
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138 bool is_frame_complete_at(address addr) const { return instructions_contains(addr) &&
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139 addr >= instructions_begin() + _frame_complete_offset; }
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140
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141 // Relocation support
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142 void fix_oop_relocations(address begin, address end) {
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143 fix_oop_relocations(begin, end, false);
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144 }
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145 void fix_oop_relocations() {
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146 fix_oop_relocations(NULL, NULL, false);
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147 }
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148 relocInfo::relocType reloc_type_for_address(address pc);
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149 bool is_at_poll_return(address pc);
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150 bool is_at_poll_or_poll_return(address pc);
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151
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152 // Support for oops in scopes and relocs:
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153 // Note: index 0 is reserved for null.
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154 oop oop_at(int index) const { return index == 0? (oop)NULL: *oop_addr_at(index); }
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155 oop* oop_addr_at(int index) const{ // for GC
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156 // relocation indexes are biased by 1 (because 0 is reserved)
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157 assert(index > 0 && index <= _oops_length, "must be a valid non-zero index");
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158 return &oops_begin()[index-1];
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159 }
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160
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161 void copy_oops(GrowableArray<jobject>* oops);
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162
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163 // CodeCache support: really only used by the nmethods, but in order to get
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164 // asserts and certain bookkeeping to work in the CodeCache they are defined
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165 // virtual here.
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166 virtual bool is_zombie() const { return false; }
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167 virtual bool is_locked_by_vm() const { return false; }
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168
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169 virtual bool is_unloaded() const { return false; }
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170 virtual bool is_not_entrant() const { return false; }
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171
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172 // GC support
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173 virtual bool is_alive() const = 0;
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174 virtual void do_unloading(BoolObjectClosure* is_alive,
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175 OopClosure* keep_alive,
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176 bool unloading_occurred);
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177 virtual void oops_do(OopClosure* f) = 0;
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989
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178 // (All CodeBlob subtypes other than NMethod currently have
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179 // an empty oops_do() method.
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0
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180
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181 // OopMap for frame
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182 OopMapSet* oop_maps() const { return _oop_maps; }
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183 void set_oop_maps(OopMapSet* p);
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184 OopMap* oop_map_for_return_address(address return_address);
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185 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); }
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186
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187 // Frame support
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188 int frame_size() const { return _frame_size; }
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189 void set_frame_size(int size) { _frame_size = size; }
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190
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191 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
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192 virtual bool caller_must_gc_arguments(JavaThread* thread) const { return false; }
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193
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194 // Naming
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195 const char* name() const { return _name; }
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196 void set_name(const char* name) { _name = name; }
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197
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198 // Debugging
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199 virtual void verify();
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200 virtual void print() const PRODUCT_RETURN;
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201 virtual void print_value_on(outputStream* st) const PRODUCT_RETURN;
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202
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203 // Print the comment associated with offset on stream, if there is one
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204 void print_block_comment(outputStream* stream, intptr_t offset) {
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205 _comments.print_block_comment(stream, offset);
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206 }
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207
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208 // Transfer ownership of comments to this CodeBlob
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209 void set_comments(CodeComments& comments) {
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210 _comments.assign(comments);
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211 }
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212 };
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213
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214
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215 //----------------------------------------------------------------------------------------------------
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216 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
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217
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218 class BufferBlob: public CodeBlob {
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219 friend class VMStructs;
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220 private:
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221 // Creation support
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222 BufferBlob(const char* name, int size);
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223 BufferBlob(const char* name, int size, CodeBuffer* cb);
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224
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225 void* operator new(size_t s, unsigned size);
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226
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227 public:
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228 // Creation
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229 static BufferBlob* create(const char* name, int buffer_size);
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230 static BufferBlob* create(const char* name, CodeBuffer* cb);
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231
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232 static void free(BufferBlob* buf);
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233
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234 // Typing
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235 bool is_buffer_blob() const { return true; }
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236 bool is_adapter_blob() const;
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237
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238 // GC/Verification support
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239 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
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240 bool is_alive() const { return true; }
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241 void do_unloading(BoolObjectClosure* is_alive,
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242 OopClosure* keep_alive,
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243 bool unloading_occurred) { /* do nothing */ }
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244
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245 void oops_do(OopClosure* f) { /* do nothing*/ }
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246
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247 void verify();
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248 void print() const PRODUCT_RETURN;
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249 void print_value_on(outputStream* st) const PRODUCT_RETURN;
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250 };
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251
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252
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253 //----------------------------------------------------------------------------------------------------
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254 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
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255
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256 class RuntimeStub: public CodeBlob {
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257 friend class VMStructs;
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258 private:
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259 bool _caller_must_gc_arguments;
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260
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261 // Creation support
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262 RuntimeStub(
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263 const char* name,
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264 CodeBuffer* cb,
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265 int size,
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266 int frame_complete,
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267 int frame_size,
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268 OopMapSet* oop_maps,
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269 bool caller_must_gc_arguments
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270 );
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271
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272 void* operator new(size_t s, unsigned size);
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273
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274 public:
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275 // Creation
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276 static RuntimeStub* new_runtime_stub(
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277 const char* stub_name,
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278 CodeBuffer* cb,
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279 int frame_complete,
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280 int frame_size,
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281 OopMapSet* oop_maps,
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282 bool caller_must_gc_arguments
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283 );
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284
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285 // Typing
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286 bool is_runtime_stub() const { return true; }
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287
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288 // GC support
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289 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
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290
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291 address entry_point() { return instructions_begin(); }
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292
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293 // GC/Verification support
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294 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
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295 bool is_alive() const { return true; }
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296 void do_unloading(BoolObjectClosure* is_alive,
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297 OopClosure* keep_alive,
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298 bool unloading_occurred) { /* do nothing */ }
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299 void oops_do(OopClosure* f) { /* do-nothing*/ }
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300
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301 void verify();
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302 void print() const PRODUCT_RETURN;
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303 void print_value_on(outputStream* st) const PRODUCT_RETURN;
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304 };
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305
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306
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307 //----------------------------------------------------------------------------------------------------
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308 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
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309
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310 class SingletonBlob: public CodeBlob {
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311 friend class VMStructs;
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312 public:
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313 SingletonBlob(
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314 const char* name,
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315 CodeBuffer* cb,
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316 int header_size,
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317 int size,
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318 int frame_size,
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319 OopMapSet* oop_maps
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320 )
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321 : CodeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
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322 {};
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323
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324 bool is_alive() const { return true; }
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325 void do_unloading(BoolObjectClosure* is_alive,
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326 OopClosure* keep_alive,
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327 bool unloading_occurred) { /* do-nothing*/ }
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328
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329 void verify(); // does nothing
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330 void print() const PRODUCT_RETURN;
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331 void print_value_on(outputStream* st) const PRODUCT_RETURN;
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332 };
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333
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334
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335 //----------------------------------------------------------------------------------------------------
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336 // DeoptimizationBlob
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337
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338 class DeoptimizationBlob: public SingletonBlob {
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339 friend class VMStructs;
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340 private:
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341 int _unpack_offset;
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342 int _unpack_with_exception;
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343 int _unpack_with_reexecution;
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344
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345 int _unpack_with_exception_in_tls;
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346
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347 // Creation support
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348 DeoptimizationBlob(
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349 CodeBuffer* cb,
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350 int size,
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351 OopMapSet* oop_maps,
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352 int unpack_offset,
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353 int unpack_with_exception_offset,
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354 int unpack_with_reexecution_offset,
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355 int frame_size
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356 );
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357
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358 void* operator new(size_t s, unsigned size);
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359
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360 public:
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361 // Creation
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362 static DeoptimizationBlob* create(
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363 CodeBuffer* cb,
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364 OopMapSet* oop_maps,
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365 int unpack_offset,
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366 int unpack_with_exception_offset,
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367 int unpack_with_reexecution_offset,
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368 int frame_size
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369 );
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370
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371 // Typing
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372 bool is_deoptimization_stub() const { return true; }
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373 const DeoptimizationBlob *as_deoptimization_stub() const { return this; }
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374 bool exception_address_is_unpack_entry(address pc) const {
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375 address unpack_pc = unpack();
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376 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
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377 }
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378
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379
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380
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381
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382 // GC for args
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383 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
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384
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385 // Iteration
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386 void oops_do(OopClosure* f) {}
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387
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388 // Printing
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389 void print_value_on(outputStream* st) const PRODUCT_RETURN;
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390
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391 address unpack() const { return instructions_begin() + _unpack_offset; }
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392 address unpack_with_exception() const { return instructions_begin() + _unpack_with_exception; }
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393 address unpack_with_reexecution() const { return instructions_begin() + _unpack_with_reexecution; }
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394
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395 // Alternate entry point for C1 where the exception and issuing pc
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396 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
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397 // instead of being in registers. This is needed because C1 doesn't
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398 // model exception paths in a way that keeps these registers free so
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399 // there may be live values in those registers during deopt.
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400 void set_unpack_with_exception_in_tls_offset(int offset) {
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401 _unpack_with_exception_in_tls = offset;
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402 assert(contains(instructions_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
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403 }
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404 address unpack_with_exception_in_tls() const { return instructions_begin() + _unpack_with_exception_in_tls; }
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405 };
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406
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407
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408 //----------------------------------------------------------------------------------------------------
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409 // UncommonTrapBlob (currently only used by Compiler 2)
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410
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411 #ifdef COMPILER2
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412
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413 class UncommonTrapBlob: public SingletonBlob {
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414 friend class VMStructs;
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415 private:
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416 // Creation support
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417 UncommonTrapBlob(
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418 CodeBuffer* cb,
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419 int size,
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420 OopMapSet* oop_maps,
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421 int frame_size
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422 );
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423
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424 void* operator new(size_t s, unsigned size);
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425
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426 public:
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427 // Creation
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428 static UncommonTrapBlob* create(
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429 CodeBuffer* cb,
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430 OopMapSet* oop_maps,
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431 int frame_size
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432 );
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433
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434 // GC for args
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435 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
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436
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437 // Typing
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438 bool is_uncommon_trap_stub() const { return true; }
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439
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440 // Iteration
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441 void oops_do(OopClosure* f) {}
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442 };
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443
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444
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445 //----------------------------------------------------------------------------------------------------
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446 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
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447
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448 class ExceptionBlob: public SingletonBlob {
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449 friend class VMStructs;
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450 private:
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451 // Creation support
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452 ExceptionBlob(
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453 CodeBuffer* cb,
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454 int size,
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455 OopMapSet* oop_maps,
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456 int frame_size
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457 );
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458
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459 void* operator new(size_t s, unsigned size);
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460
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461 public:
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462 // Creation
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463 static ExceptionBlob* create(
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464 CodeBuffer* cb,
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465 OopMapSet* oop_maps,
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466 int frame_size
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467 );
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468
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469 // GC for args
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470 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
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471
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472 // Typing
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473 bool is_exception_stub() const { return true; }
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474
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475 // Iteration
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476 void oops_do(OopClosure* f) {}
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477 };
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478 #endif // COMPILER2
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479
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480
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481 //----------------------------------------------------------------------------------------------------
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482 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
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483
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484 class SafepointBlob: public SingletonBlob {
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485 friend class VMStructs;
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486 private:
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487 // Creation support
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488 SafepointBlob(
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489 CodeBuffer* cb,
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490 int size,
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491 OopMapSet* oop_maps,
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492 int frame_size
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493 );
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494
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495 void* operator new(size_t s, unsigned size);
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496
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497 public:
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498 // Creation
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499 static SafepointBlob* create(
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500 CodeBuffer* cb,
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501 OopMapSet* oop_maps,
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502 int frame_size
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503 );
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504
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505 // GC for args
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506 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
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507
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508 // Typing
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509 bool is_safepoint_stub() const { return true; }
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510
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511 // Iteration
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512 void oops_do(OopClosure* f) {}
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513 };
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