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1 /*
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2 * Copyright 1997-2005 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 // Forward definition
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26 class MethodOopMap;
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27 class GenerateOopMap;
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28 class BasicBlock;
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29 class CellTypeState;
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30 class StackMap;
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31
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32 // These two should be removed. But requires som code to be cleaned up
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33 #define MAXARGSIZE 256 // This should be enough
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34 #define MAX_LOCAL_VARS 65536 // 16-bit entry
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35
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36 typedef void (*jmpFct_t)(GenerateOopMap *c, int bcpDelta, int* data);
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37
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38
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39 // RetTable
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40 //
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41 // Contains maping between jsr targets and there return addresses. One-to-many mapping
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42 //
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43 class RetTableEntry : public ResourceObj {
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44 private:
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45 static int _init_nof_jsrs; // Default size of jsrs list
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46 int _target_bci; // Target PC address of jump (bytecode index)
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47 GrowableArray<intptr_t> * _jsrs; // List of return addresses (bytecode index)
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48 RetTableEntry *_next; // Link to next entry
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49 public:
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50 RetTableEntry(int target, RetTableEntry *next) { _target_bci=target; _jsrs = new GrowableArray<intptr_t>(_init_nof_jsrs); _next = next; }
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51
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52 // Query
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53 int target_bci() const { return _target_bci; }
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54 int nof_jsrs() const { return _jsrs->length(); }
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55 int jsrs(int i) const { assert(i>=0 && i<nof_jsrs(), "Index out of bounds"); return _jsrs->at(i); }
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56
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57 // Update entry
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58 void add_jsr (int return_bci) { _jsrs->append(return_bci); }
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59 void add_delta (int bci, int delta);
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60 RetTableEntry * next() const { return _next; }
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61 };
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62
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63
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64 class RetTable VALUE_OBJ_CLASS_SPEC {
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65 private:
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66 RetTableEntry *_first;
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67 static int _init_nof_entries;
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68
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69 void add_jsr(int return_bci, int target_bci); // Adds entry to list
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70 public:
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71 RetTable() { _first = NULL; }
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72 void compute_ret_table(methodHandle method);
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73 void update_ret_table(int bci, int delta);
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74 RetTableEntry* find_jsrs_for_target(int targBci);
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75 };
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76
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77 //
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78 // CellTypeState
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79 //
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80 class CellTypeState VALUE_OBJ_CLASS_SPEC {
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81 private:
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82 unsigned int _state;
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83
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84 // Masks for separating the BITS and INFO portions of a CellTypeState
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85 enum { info_mask = right_n_bits(28),
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86 bits_mask = (int)(~info_mask) };
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87
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88 // These constant are used for manipulating the BITS portion of a
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89 // CellTypeState
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90 enum { uninit_bit = (int)(nth_bit(31)),
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91 ref_bit = nth_bit(30),
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92 val_bit = nth_bit(29),
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93 addr_bit = nth_bit(28),
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94 live_bits_mask = (int)(bits_mask & ~uninit_bit) };
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95
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96 // These constants are used for manipulating the INFO portion of a
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97 // CellTypeState
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98 enum { top_info_bit = nth_bit(27),
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99 not_bottom_info_bit = nth_bit(26),
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100 info_data_mask = right_n_bits(26),
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101 info_conflict = info_mask };
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102
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103 // Within the INFO data, these values are used to distinguish different
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104 // kinds of references.
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105 enum { ref_not_lock_bit = nth_bit(25), // 0 if this reference is locked as a monitor
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106 ref_slot_bit = nth_bit(24), // 1 if this reference is a "slot" reference,
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107 // 0 if it is a "line" reference.
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108 ref_data_mask = right_n_bits(24) };
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109
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110
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111 // These values are used to initialize commonly used CellTypeState
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112 // constants.
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113 enum { bottom_value = 0,
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114 uninit_value = (int)(uninit_bit | info_conflict),
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115 ref_value = ref_bit,
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116 ref_conflict = ref_bit | info_conflict,
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117 val_value = val_bit | info_conflict,
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118 addr_value = addr_bit,
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119 addr_conflict = addr_bit | info_conflict };
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120
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121 public:
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122
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123 // Since some C++ constructors generate poor code for declarations of the
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124 // form...
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125 //
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126 // CellTypeState vector[length];
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127 //
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128 // ...we avoid making a constructor for this class. CellTypeState values
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129 // should be constructed using one of the make_* methods:
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130
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131 static CellTypeState make_any(int state) {
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132 CellTypeState s;
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133 s._state = state;
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134 // Causes SS10 warning.
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135 // assert(s.is_valid_state(), "check to see if CellTypeState is valid");
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136 return s;
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137 }
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138
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139 static CellTypeState make_bottom() {
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140 return make_any(0);
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141 }
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142
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143 static CellTypeState make_top() {
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144 return make_any(AllBits);
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145 }
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146
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147 static CellTypeState make_addr(int bci) {
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148 assert((bci >= 0) && (bci < info_data_mask), "check to see if ret addr is valid");
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149 return make_any(addr_bit | not_bottom_info_bit | (bci & info_data_mask));
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150 }
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151
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152 static CellTypeState make_slot_ref(int slot_num) {
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153 assert(slot_num >= 0 && slot_num < ref_data_mask, "slot out of range");
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154 return make_any(ref_bit | not_bottom_info_bit | ref_not_lock_bit | ref_slot_bit |
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155 (slot_num & ref_data_mask));
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156 }
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157
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158 static CellTypeState make_line_ref(int bci) {
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159 assert(bci >= 0 && bci < ref_data_mask, "line out of range");
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160 return make_any(ref_bit | not_bottom_info_bit | ref_not_lock_bit |
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161 (bci & ref_data_mask));
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162 }
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163
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164 static CellTypeState make_lock_ref(int bci) {
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165 assert(bci >= 0 && bci < ref_data_mask, "line out of range");
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166 return make_any(ref_bit | not_bottom_info_bit | (bci & ref_data_mask));
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167 }
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168
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169 // Query methods:
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170 bool is_bottom() const { return _state == 0; }
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171 bool is_live() const { return ((_state & live_bits_mask) != 0); }
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172 bool is_valid_state() const {
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173 // Uninitialized and value cells must contain no data in their info field:
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174 if ((can_be_uninit() || can_be_value()) && !is_info_top()) {
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175 return false;
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176 }
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177 // The top bit is only set when all info bits are set:
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178 if (is_info_top() && ((_state & info_mask) != info_mask)) {
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179 return false;
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180 }
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181 // The not_bottom_bit must be set when any other info bit is set:
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182 if (is_info_bottom() && ((_state & info_mask) != 0)) {
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183 return false;
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184 }
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185 return true;
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186 }
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187
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188 bool is_address() const { return ((_state & bits_mask) == addr_bit); }
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189 bool is_reference() const { return ((_state & bits_mask) == ref_bit); }
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190 bool is_value() const { return ((_state & bits_mask) == val_bit); }
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191 bool is_uninit() const { return ((_state & bits_mask) == (uint)uninit_bit); }
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192
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193 bool can_be_address() const { return ((_state & addr_bit) != 0); }
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194 bool can_be_reference() const { return ((_state & ref_bit) != 0); }
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195 bool can_be_value() const { return ((_state & val_bit) != 0); }
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196 bool can_be_uninit() const { return ((_state & uninit_bit) != 0); }
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197
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198 bool is_info_bottom() const { return ((_state & not_bottom_info_bit) == 0); }
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199 bool is_info_top() const { return ((_state & top_info_bit) != 0); }
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200 int get_info() const {
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201 assert((!is_info_top() && !is_info_bottom()),
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202 "check to make sure top/bottom info is not used");
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203 return (_state & info_data_mask);
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204 }
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205
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206 bool is_good_address() const { return is_address() && !is_info_top(); }
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207 bool is_lock_reference() const {
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208 return ((_state & (bits_mask | top_info_bit | ref_not_lock_bit)) == ref_bit);
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209 }
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210 bool is_nonlock_reference() const {
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211 return ((_state & (bits_mask | top_info_bit | ref_not_lock_bit)) == (ref_bit | ref_not_lock_bit));
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212 }
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213
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214 bool equal(CellTypeState a) const { return _state == a._state; }
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215 bool equal_kind(CellTypeState a) const {
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216 return (_state & bits_mask) == (a._state & bits_mask);
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217 }
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218
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219 char to_char() const;
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220
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221 // Merge
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222 CellTypeState merge (CellTypeState cts, int slot) const;
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223
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224 // Debugging output
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225 void print(outputStream *os);
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226
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227 // Default values of common values
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228 static CellTypeState bottom;
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229 static CellTypeState uninit;
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230 static CellTypeState ref;
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231 static CellTypeState value;
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232 static CellTypeState refUninit;
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233 static CellTypeState varUninit;
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234 static CellTypeState top;
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235 static CellTypeState addr;
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236 };
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237
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238
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239 //
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240 // BasicBlockStruct
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241 //
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242 class BasicBlock: ResourceObj {
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243 private:
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244 bool _changed; // Reached a fixpoint or not
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245 public:
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246 enum Constants {
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247 _dead_basic_block = -2,
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248 _unreached = -1 // Alive but not yet reached by analysis
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249 // >=0 // Alive and has a merged state
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250 };
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251
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252 int _bci; // Start of basic block
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253 int _end_bci; // Bci of last instruction in basicblock
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254 int _max_locals; // Determines split between vars and stack
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255 int _max_stack; // Determines split between stack and monitors
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256 CellTypeState* _state; // State (vars, stack) at entry.
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257 int _stack_top; // -1 indicates bottom stack value.
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258 int _monitor_top; // -1 indicates bottom monitor stack value.
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259
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260 CellTypeState* vars() { return _state; }
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261 CellTypeState* stack() { return _state + _max_locals; }
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262
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263 bool changed() { return _changed; }
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264 void set_changed(bool s) { _changed = s; }
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265
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266 bool is_reachable() const { return _stack_top >= 0; } // Analysis has reached this basicblock
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267
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268 // All basicblocks that are unreachable are going to have a _stack_top == _dead_basic_block.
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269 // This info. is setup in a pre-parse before the real abstract interpretation starts.
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270 bool is_dead() const { return _stack_top == _dead_basic_block; }
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271 bool is_alive() const { return _stack_top != _dead_basic_block; }
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272 void mark_as_alive() { assert(is_dead(), "must be dead"); _stack_top = _unreached; }
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273 };
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274
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275
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276 //
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277 // GenerateOopMap
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278 //
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279 // Main class used to compute the pointer-maps in a MethodOop
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280 //
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281 class GenerateOopMap VALUE_OBJ_CLASS_SPEC {
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282 protected:
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283
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284 // _monitor_top is set to this constant to indicate that a monitor matching
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285 // problem was encountered prior to this point in control flow.
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286 enum { bad_monitors = -1 };
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287
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288 // Main variables
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289 methodHandle _method; // The method we are examine
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290 RetTable _rt; // Contains the return address mappings
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291 int _max_locals; // Cached value of no. of locals
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292 int _max_stack; // Cached value of max. stack depth
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293 int _max_monitors; // Cached value of max. monitor stack depth
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294 int _has_exceptions; // True, if exceptions exist for method
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295 bool _got_error; // True, if an error occured during interpretation.
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296 Handle _exception; // Exception if got_error is true.
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297 bool _did_rewriting; // was bytecodes rewritten
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298 bool _did_relocation; // was relocation neccessary
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299 bool _monitor_safe; // The monitors in this method have been determined
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300 // to be safe.
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301
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302 // Working Cell type state
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303 int _state_len; // Size of states
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304 CellTypeState *_state; // list of states
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305 char *_state_vec_buf; // Buffer used to print a readable version of a state
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306 int _stack_top;
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307 int _monitor_top;
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308
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309 // Timing and statistics
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310 static elapsedTimer _total_oopmap_time; // Holds cumulative oopmap generation time
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311 static long _total_byte_count; // Holds cumulative number of bytes inspected
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312
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313 // Cell type methods
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314 void init_state();
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315 void make_context_uninitialized ();
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316 int methodsig_to_effect (symbolOop signature, bool isStatic, CellTypeState* effect);
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317 bool merge_local_state_vectors (CellTypeState* cts, CellTypeState* bbts);
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318 bool merge_monitor_state_vectors(CellTypeState* cts, CellTypeState* bbts);
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319 void copy_state (CellTypeState *dst, CellTypeState *src);
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320 void merge_state_into_bb (BasicBlock *bb);
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321 static void merge_state (GenerateOopMap *gom, int bcidelta, int* data);
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322 void set_var (int localNo, CellTypeState cts);
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323 CellTypeState get_var (int localNo);
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324 CellTypeState pop ();
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325 void push (CellTypeState cts);
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326 CellTypeState monitor_pop ();
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327 void monitor_push (CellTypeState cts);
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328 CellTypeState * vars () { return _state; }
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329 CellTypeState * stack () { return _state+_max_locals; }
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330 CellTypeState * monitors () { return _state+_max_locals+_max_stack; }
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331
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332 void replace_all_CTS_matches (CellTypeState match,
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333 CellTypeState replace);
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334 void print_states (outputStream *os, CellTypeState *vector, int num);
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335 void print_current_state (outputStream *os,
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336 BytecodeStream *itr,
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337 bool detailed);
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338 void report_monitor_mismatch (const char *msg);
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339
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340 // Basicblock info
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341 BasicBlock * _basic_blocks; // Array of basicblock info
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342 int _gc_points;
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343 int _bb_count;
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342
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344 BitMap _bb_hdr_bits;
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0
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345
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346 // Basicblocks methods
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347 void initialize_bb ();
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348 void mark_bbheaders_and_count_gc_points();
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342
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349 bool is_bb_header (int bci) const {
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350 return _bb_hdr_bits.at(bci);
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351 }
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0
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352 int gc_points () const { return _gc_points; }
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353 int bb_count () const { return _bb_count; }
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342
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354 void set_bbmark_bit (int bci) {
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355 _bb_hdr_bits.at_put(bci, true);
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356 }
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357 void clear_bbmark_bit (int bci) {
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358 _bb_hdr_bits.at_put(bci, false);
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359 }
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0
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360 BasicBlock * get_basic_block_at (int bci) const;
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361 BasicBlock * get_basic_block_containing (int bci) const;
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362 void interp_bb (BasicBlock *bb);
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363 void restore_state (BasicBlock *bb);
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364 int next_bb_start_pc (BasicBlock *bb);
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365 void update_basic_blocks (int bci, int delta, int new_method_size);
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366 static void bb_mark_fct (GenerateOopMap *c, int deltaBci, int *data);
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367
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368 // Dead code detection
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369 void mark_reachable_code();
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370 static void reachable_basicblock (GenerateOopMap *c, int deltaBci, int *data);
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371
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372 // Interpretation methods (primary)
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373 void do_interpretation ();
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374 void init_basic_blocks ();
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375 void setup_method_entry_state ();
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376 void interp_all ();
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377
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378 // Interpretation methods (secondary)
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379 void interp1 (BytecodeStream *itr);
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380 void do_exception_edge (BytecodeStream *itr);
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381 void check_type (CellTypeState expected, CellTypeState actual);
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382 void ppstore (CellTypeState *in, int loc_no);
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383 void ppload (CellTypeState *out, int loc_no);
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384 void ppush1 (CellTypeState in);
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385 void ppush (CellTypeState *in);
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386 void ppop1 (CellTypeState out);
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387 void ppop (CellTypeState *out);
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388 void ppop_any (int poplen);
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389 void pp (CellTypeState *in, CellTypeState *out);
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390 void pp_new_ref (CellTypeState *in, int bci);
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391 void ppdupswap (int poplen, const char *out);
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392 void do_ldc (int idx, int bci);
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393 void do_astore (int idx);
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394 void do_jsr (int delta);
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395 void do_field (int is_get, int is_static, int idx, int bci);
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396 void do_method (int is_static, int is_interface, int idx, int bci);
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397 void do_multianewarray (int dims, int bci);
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398 void do_monitorenter (int bci);
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399 void do_monitorexit (int bci);
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400 void do_return_monitor_check ();
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401 void do_checkcast ();
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402 CellTypeState *sigchar_to_effect (char sigch, int bci, CellTypeState *out);
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403 int copy_cts (CellTypeState *dst, CellTypeState *src);
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404
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405 // Error handling
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406 void error_work (const char *format, va_list ap);
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407 void report_error (const char *format, ...);
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408 void verify_error (const char *format, ...);
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409 bool got_error() { return _got_error; }
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410
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411 // Create result set
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412 bool _report_result;
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413 bool _report_result_for_send; // Unfortunatly, stackmaps for sends are special, so we need some extra
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414 BytecodeStream *_itr_send; // variables to handle them properly.
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415
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416 void report_result ();
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417
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418 // Initvars
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419 GrowableArray<intptr_t> * _init_vars;
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420
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421 void initialize_vars ();
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422 void add_to_ref_init_set (int localNo);
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423
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424 // Conflicts rewrite logic
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425 bool _conflict; // True, if a conflict occured during interpretation
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426 int _nof_refval_conflicts; // No. of conflicts that require rewrites
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427 int * _new_var_map;
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428
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429 void record_refval_conflict (int varNo);
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430 void rewrite_refval_conflicts ();
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431 void rewrite_refval_conflict (int from, int to);
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432 bool rewrite_refval_conflict_inst (BytecodeStream *i, int from, int to);
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433 bool rewrite_load_or_store (BytecodeStream *i, Bytecodes::Code bc, Bytecodes::Code bc0, unsigned int varNo);
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434
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435 void expand_current_instr (int bci, int ilen, int newIlen, u_char inst_buffer[]);
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436 bool is_astore (BytecodeStream *itr, int *index);
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437 bool is_aload (BytecodeStream *itr, int *index);
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438
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439 // List of bci's where a return address is on top of the stack
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440 GrowableArray<intptr_t> *_ret_adr_tos;
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441
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442 bool stack_top_holds_ret_addr (int bci);
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443 void compute_ret_adr_at_TOS ();
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444 void update_ret_adr_at_TOS (int bci, int delta);
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445
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446 int binsToHold (int no) { return ((no+(BitsPerWord-1))/BitsPerWord); }
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447 char *state_vec_to_string (CellTypeState* vec, int len);
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448
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449 // Helper method. Can be used in subclasses to fx. calculate gc_points. If the current instuction
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450 // is a control transfer, then calls the jmpFct all possible destinations.
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451 void ret_jump_targets_do (BytecodeStream *bcs, jmpFct_t jmpFct, int varNo,int *data);
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452 bool jump_targets_do (BytecodeStream *bcs, jmpFct_t jmpFct, int *data);
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453
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454 friend class RelocCallback;
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455 public:
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456 GenerateOopMap(methodHandle method);
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457
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458 // Compute the map.
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459 void compute_map(TRAPS);
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460 void result_for_basicblock(int bci); // Do a callback on fill_stackmap_for_opcodes for basicblock containing bci
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461
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462 // Query
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463 int max_locals() const { return _max_locals; }
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464 methodOop method() const { return _method(); }
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465 methodHandle method_as_handle() const { return _method; }
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466
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467 bool did_rewriting() { return _did_rewriting; }
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468 bool did_relocation() { return _did_relocation; }
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469
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470 static void print_time();
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471
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472 // Monitor query
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473 bool monitor_safe() { return _monitor_safe; }
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474
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475 // Specialization methods. Intended use:
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476 // - possible_gc_point must return true for every bci for which the stackmaps must be returned
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477 // - fill_stackmap_prolog is called just before the result is reported. The arguments tells the estimated
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478 // number of gc points
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479 // - fill_stackmap_for_opcodes is called once for each bytecode index in order (0...code_length-1)
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480 // - fill_stackmap_epilog is called after all results has been reported. Note: Since the algorithm does not report
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481 // stackmaps for deadcode, fewer gc_points might have been encounted than assumed during the epilog. It is the
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482 // responsibility of the subclass to count the correct number.
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483 // - fill_init_vars are called once with the result of the init_vars computation
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484 //
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485 // All these methods are used during a call to: compute_map. Note: Non of the return results are valid
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486 // after compute_map returns, since all values are allocated as resource objects.
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487 //
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488 // All virtual method must be implemented in subclasses
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489 virtual bool allow_rewrites () const { return false; }
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490 virtual bool report_results () const { return true; }
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491 virtual bool report_init_vars () const { return true; }
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492 virtual bool possible_gc_point (BytecodeStream *bcs) { ShouldNotReachHere(); return false; }
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493 virtual void fill_stackmap_prolog (int nof_gc_points) { ShouldNotReachHere(); }
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494 virtual void fill_stackmap_epilog () { ShouldNotReachHere(); }
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495 virtual void fill_stackmap_for_opcodes (BytecodeStream *bcs,
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496 CellTypeState* vars,
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497 CellTypeState* stack,
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498 int stackTop) { ShouldNotReachHere(); }
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499 virtual void fill_init_vars (GrowableArray<intptr_t> *init_vars) { ShouldNotReachHere();; }
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500 };
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501
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502 //
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503 // Subclass of the GenerateOopMap Class that just do rewrites of the method, if needed.
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504 // It does not store any oopmaps.
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505 //
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506 class ResolveOopMapConflicts: public GenerateOopMap {
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507 private:
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508
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509 bool _must_clear_locals;
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510
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511 virtual bool report_results() const { return false; }
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512 virtual bool report_init_vars() const { return true; }
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513 virtual bool allow_rewrites() const { return true; }
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514 virtual bool possible_gc_point (BytecodeStream *bcs) { return false; }
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515 virtual void fill_stackmap_prolog (int nof_gc_points) {}
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516 virtual void fill_stackmap_epilog () {}
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517 virtual void fill_stackmap_for_opcodes (BytecodeStream *bcs,
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518 CellTypeState* vars,
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519 CellTypeState* stack,
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520 int stack_top) {}
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521 virtual void fill_init_vars (GrowableArray<intptr_t> *init_vars) { _must_clear_locals = init_vars->length() > 0; }
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522
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523 #ifndef PRODUCT
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524 // Statistics
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525 static int _nof_invocations;
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526 static int _nof_rewrites;
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527 static int _nof_relocations;
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528 #endif
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529
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530 public:
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531 ResolveOopMapConflicts(methodHandle method) : GenerateOopMap(method) { _must_clear_locals = false; };
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532
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533 methodHandle do_potential_rewrite(TRAPS);
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534 bool must_clear_locals() const { return _must_clear_locals; }
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535 };
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536
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537
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538 //
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539 // Subclass used by the compiler to generate pairing infomation
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540 //
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541 class GeneratePairingInfo: public GenerateOopMap {
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542 private:
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543
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544 virtual bool report_results() const { return false; }
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545 virtual bool report_init_vars() const { return false; }
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546 virtual bool allow_rewrites() const { return false; }
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547 virtual bool possible_gc_point (BytecodeStream *bcs) { return false; }
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548 virtual void fill_stackmap_prolog (int nof_gc_points) {}
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549 virtual void fill_stackmap_epilog () {}
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550 virtual void fill_stackmap_for_opcodes (BytecodeStream *bcs,
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551 CellTypeState* vars,
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552 CellTypeState* stack,
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553 int stack_top) {}
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554 virtual void fill_init_vars (GrowableArray<intptr_t> *init_vars) {}
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555 public:
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556 GeneratePairingInfo(methodHandle method) : GenerateOopMap(method) {};
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557
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558 // Call compute_map(CHECK) to generate info.
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559 };
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