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1 /*
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2 * Copyright 1999-2009 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 class ciMethodBlocks;
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26 class MethodLiveness;
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27 class BitMap;
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28 class Arena;
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29 class BCEscapeAnalyzer;
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30
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31
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32 // ciMethod
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33 //
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34 // This class represents a methodOop in the HotSpot virtual
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35 // machine.
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36 class ciMethod : public ciObject {
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37 friend class CompileBroker;
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38 CI_PACKAGE_ACCESS
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39 friend class ciEnv;
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40 friend class ciExceptionHandlerStream;
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41
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42 private:
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43 // General method information.
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44 ciFlags _flags;
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45 ciSymbol* _name;
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46 ciInstanceKlass* _holder;
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47 ciSignature* _signature;
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48 ciMethodData* _method_data;
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49 BCEscapeAnalyzer* _bcea;
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50 ciMethodBlocks* _method_blocks;
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51
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52 // Code attributes.
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53 int _code_size;
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54 int _max_stack;
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55 int _max_locals;
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56 vmIntrinsics::ID _intrinsic_id;
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57 int _handler_count;
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58 int _interpreter_invocation_count;
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59 int _interpreter_throwout_count;
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60
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61 bool _uses_monitors;
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62 bool _balanced_monitors;
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63 bool _is_compilable;
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64 bool _can_be_statically_bound;
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65
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66 // Lazy fields, filled in on demand
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67 address _code;
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68 ciExceptionHandler** _exception_handlers;
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69
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70 // Optional liveness analyzer.
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71 MethodLiveness* _liveness;
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72 #ifdef COMPILER2
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73 ciTypeFlow* _flow;
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74 #endif
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75
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76 ciMethod(methodHandle h_m);
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77 ciMethod(ciInstanceKlass* holder, ciSymbol* name, ciSymbol* signature);
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78
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79 methodOop get_methodOop() const {
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80 methodOop m = (methodOop)get_oop();
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81 assert(m != NULL, "illegal use of unloaded method");
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82 return m;
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83 }
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84
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85 oop loader() const { return _holder->loader(); }
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86
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87 const char* type_string() { return "ciMethod"; }
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88
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89 void print_impl(outputStream* st);
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90
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91 void load_code();
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92
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93 void check_is_loaded() const { assert(is_loaded(), "not loaded"); }
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94
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95 void build_method_data(methodHandle h_m);
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96
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97 void code_at_put(int bci, Bytecodes::Code code) {
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98 Bytecodes::check(code);
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99 assert(0 <= bci && bci < code_size(), "valid bci");
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100 address bcp = _code + bci;
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101 *bcp = code;
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102 }
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103
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104 public:
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105 // Basic method information.
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106 ciFlags flags() const { check_is_loaded(); return _flags; }
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107 ciSymbol* name() const { return _name; }
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108 ciInstanceKlass* holder() const { return _holder; }
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109 ciMethodData* method_data();
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110
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111 // Signature information.
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112 ciSignature* signature() const { return _signature; }
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113 ciType* return_type() const { return _signature->return_type(); }
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114 int arg_size_no_receiver() const { return _signature->size(); }
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115 int arg_size() const { return _signature->size() + (_flags.is_static() ? 0 : 1); }
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116
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117 // Method code and related information.
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118 address code() { if (_code == NULL) load_code(); return _code; }
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119 int code_size() const { check_is_loaded(); return _code_size; }
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120 int max_stack() const { check_is_loaded(); return _max_stack; }
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121 int max_locals() const { check_is_loaded(); return _max_locals; }
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122 vmIntrinsics::ID intrinsic_id() const { check_is_loaded(); return _intrinsic_id; }
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123 bool has_exception_handlers() const { check_is_loaded(); return _handler_count > 0; }
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124 int exception_table_length() const { check_is_loaded(); return _handler_count; }
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125 int interpreter_invocation_count() const { check_is_loaded(); return _interpreter_invocation_count; }
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126 int interpreter_throwout_count() const { check_is_loaded(); return _interpreter_throwout_count; }
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127
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128 Bytecodes::Code java_code_at_bci(int bci) {
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129 address bcp = code() + bci;
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130 return Bytecodes::java_code_at(bcp);
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131 }
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132 BCEscapeAnalyzer *get_bcea();
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133 ciMethodBlocks *get_method_blocks();
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134
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135 bool has_linenumber_table() const; // length unknown until decompression
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136 u_char* compressed_linenumber_table() const; // not preserved by gc
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137
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138 int line_number_from_bci(int bci) const;
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139
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140 // Runtime information.
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141 int vtable_index();
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142 address native_entry();
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143 address interpreter_entry();
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144
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145 // Analysis and profiling.
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146 //
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147 // Usage note: liveness_at_bci and init_vars should be wrapped in ResourceMarks.
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148 bool uses_monitors() const { return _uses_monitors; } // this one should go away, it has a misleading name
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149 bool has_monitor_bytecodes() const { return _uses_monitors; }
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150 bool has_balanced_monitors();
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151
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152 MethodLivenessResult liveness_at_bci(int bci);
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153
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154 // Get the interpreters viewpoint on oop liveness. MethodLiveness is
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155 // conservative in the sense that it may consider locals to be live which
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156 // cannot be live, like in the case where a local could contain an oop or
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157 // a primitive along different paths. In that case the local must be
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158 // dead when those paths merge. Since the interpreter's viewpoint is
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159 // used when gc'ing an interpreter frame we need to use its viewpoint
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160 // during OSR when loading the locals.
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161
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162 BitMap live_local_oops_at_bci(int bci);
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163
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164 #ifdef COMPILER1
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165 const BitMap bci_block_start();
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166 #endif
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167
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168 ciTypeFlow* get_flow_analysis();
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169 ciTypeFlow* get_osr_flow_analysis(int osr_bci); // alternate entry point
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170 ciCallProfile call_profile_at_bci(int bci);
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171 int interpreter_call_site_count(int bci);
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172
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173 // Given a certain calling environment, find the monomorphic target
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174 // for the call. Return NULL if the call is not monomorphic in
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175 // its calling environment.
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176 ciMethod* find_monomorphic_target(ciInstanceKlass* caller,
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177 ciInstanceKlass* callee_holder,
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178 ciInstanceKlass* actual_receiver);
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179
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180 // Given a known receiver klass, find the target for the call.
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181 // Return NULL if the call has no target or is abstract.
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182 ciMethod* resolve_invoke(ciKlass* caller, ciKlass* exact_receiver);
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183
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184 // Find the proper vtable index to invoke this method.
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185 int resolve_vtable_index(ciKlass* caller, ciKlass* receiver);
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186
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187 // Compilation directives
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188 bool will_link(ciKlass* accessing_klass,
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189 ciKlass* declared_method_holder,
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190 Bytecodes::Code bc);
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191 bool should_exclude();
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192 bool should_inline();
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193 bool should_not_inline();
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194 bool should_print_assembly();
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195 bool break_at_execute();
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196 bool has_option(const char *option);
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197 bool can_be_compiled();
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198 bool can_be_osr_compiled(int entry_bci);
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199 void set_not_compilable();
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200 bool has_compiled_code();
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201 int instructions_size();
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202 void log_nmethod_identity(xmlStream* log);
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203 bool is_not_reached(int bci);
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204 bool was_executed_more_than(int times);
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205 bool has_unloaded_classes_in_signature();
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206 bool is_klass_loaded(int refinfo_index, bool must_be_resolved) const;
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207 bool check_call(int refinfo_index, bool is_static) const;
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208 void build_method_data(); // make sure it exists in the VM also
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209 int scale_count(int count, float prof_factor = 1.); // make MDO count commensurate with IIC
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210 bool is_method_handle_invoke();
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211 ciInstance* method_handle_type();
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212
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213 // What kind of ciObject is this?
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214 bool is_method() { return true; }
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215
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216 // Java access flags
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217 bool is_public () const { return flags().is_public(); }
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218 bool is_private () const { return flags().is_private(); }
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219 bool is_protected () const { return flags().is_protected(); }
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220 bool is_static () const { return flags().is_static(); }
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221 bool is_final () const { return flags().is_final(); }
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222 bool is_synchronized() const { return flags().is_synchronized(); }
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223 bool is_native () const { return flags().is_native(); }
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224 bool is_interface () const { return flags().is_interface(); }
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225 bool is_abstract () const { return flags().is_abstract(); }
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226 bool is_strict () const { return flags().is_strict(); }
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227
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228 // Other flags
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229 bool is_empty_method() const;
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230 bool is_vanilla_constructor() const;
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231 bool is_final_method() const { return is_final() || holder()->is_final(); }
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232 bool has_loops () const;
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233 bool has_jsrs () const;
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234 bool is_accessor () const;
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235 bool is_initializer () const;
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236 bool can_be_statically_bound() const { return _can_be_statically_bound; }
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237
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238 // Print the bytecodes of this method.
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239 void print_codes_on(outputStream* st);
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240 void print_codes() {
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241 print_codes_on(tty);
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242 }
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243 void print_codes_on(int from, int to, outputStream* st);
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244
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245 // Print the name of this method in various incarnations.
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246 void print_name(outputStream* st = tty);
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247 void print_short_name(outputStream* st = tty);
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248 };
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