46 extern void vm_exit_during_initialization(Handle exception); |
46 extern void vm_exit_during_initialization(Handle exception); |
47 extern void vm_exit_during_initialization(symbolHandle exception_name, const char* message); |
47 extern void vm_exit_during_initialization(symbolHandle exception_name, const char* message); |
48 extern void vm_exit_during_initialization(const char* error, const char* message = NULL); |
48 extern void vm_exit_during_initialization(const char* error, const char* message = NULL); |
49 extern void vm_shutdown_during_initialization(const char* error, const char* message = NULL); |
49 extern void vm_shutdown_during_initialization(const char* error, const char* message = NULL); |
50 |
50 |
51 class JDK_Version : AllStatic { |
51 /** |
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52 * Discovering the JDK_Version during initialization is tricky when the |
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53 * running JDK is less than JDK6. For JDK6 and greater, a "GetVersion" |
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54 * function exists in libjava.so and we simply call it during the |
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55 * 'initialize()' call to find the version. For JDKs with version < 6, no |
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56 * such call exists and we have to probe the JDK in order to determine |
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57 * the exact version. This probing cannot happen during late in |
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58 * the VM initialization process so there's a period of time during |
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59 * initialization when we don't know anything about the JDK version other than |
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60 * that it less than version 6. This is the "partially initialized" time, |
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61 * when we can answer only certain version queries (such as, is the JDK |
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62 * version greater than 5? Answer: no). Once the JDK probing occurs, we |
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63 * know the version and are considered fully initialized. |
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64 */ |
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65 class JDK_Version VALUE_OBJ_CLASS_SPEC { |
52 friend class VMStructs; |
66 friend class VMStructs; |
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67 friend class Universe; |
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68 friend void JDK_Version_init(); |
53 private: |
69 private: |
54 static jdk_version_info _version_info; |
70 |
55 static bool _pre_jdk16_version; |
71 static JDK_Version _current; |
56 static int _jdk_version; // JDK version number representing the release |
72 |
57 // i.e. n in 1.n.x (= jdk_minor_version()) |
73 // In this class, we promote the minor version of release to be the |
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74 // major version for releases >= 5 in anticipation of the JDK doing the |
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75 // same thing. For example, we represent "1.5.0" as major version 5 (we |
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76 // drop the leading 1 and use 5 as the 'major'). |
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77 |
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78 uint8_t _major; |
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79 uint8_t _minor; |
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80 uint8_t _micro; |
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81 uint8_t _update; |
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82 uint8_t _special; |
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83 uint8_t _build; |
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84 |
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85 // If partially initialized, the above fields are invalid and we know |
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86 // that we're less than major version 6. |
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87 bool _partially_initialized; |
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88 |
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89 bool _thread_park_blocker; |
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90 |
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91 bool is_valid() const { |
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92 return (_major != 0 || _partially_initialized); |
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93 } |
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94 |
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95 // initializes or partially initializes the _current static field |
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96 static void initialize(); |
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97 |
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98 // Completes initialization for a pre-JDK6 version. |
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99 static void fully_initialize(uint8_t major, uint8_t minor = 0, |
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100 uint8_t micro = 0, uint8_t update = 0); |
58 |
101 |
59 public: |
102 public: |
60 static void initialize(); |
103 |
61 static int jdk_major_version() { return JDK_VERSION_MAJOR(_version_info.jdk_version); } |
104 // Returns true if the the current version has only been partially initialized |
62 static int jdk_minor_version() { return JDK_VERSION_MINOR(_version_info.jdk_version); } |
105 static bool is_partially_initialized() { |
63 static int jdk_micro_version() { return JDK_VERSION_MICRO(_version_info.jdk_version); } |
106 return _current._partially_initialized; |
64 static int jdk_build_number() { return JDK_VERSION_BUILD(_version_info.jdk_version); } |
107 } |
65 |
108 |
66 static bool is_pre_jdk16_version() { return _pre_jdk16_version; } |
109 JDK_Version() : _major(0), _minor(0), _micro(0), _update(0), |
67 static bool is_jdk12x_version() { assert(is_jdk_version_initialized(), "must have been initialized"); return _jdk_version == 2; } |
110 _special(0), _build(0), _partially_initialized(false), |
68 static bool is_jdk13x_version() { assert(is_jdk_version_initialized(), "must have been initialized"); return _jdk_version == 3; } |
111 _thread_park_blocker(false) {} |
69 static bool is_jdk14x_version() { assert(is_jdk_version_initialized(), "must have been initialized"); return _jdk_version == 4; } |
112 |
70 static bool is_jdk15x_version() { assert(is_jdk_version_initialized(), "must have been initialized"); return _jdk_version == 5; } |
113 JDK_Version(uint8_t major, uint8_t minor = 0, uint8_t micro = 0, |
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114 uint8_t update = 0, uint8_t special = 0, uint8_t build = 0, |
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115 bool thread_park_blocker = false) : |
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116 _major(major), _minor(minor), _micro(micro), _update(update), |
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117 _special(special), _build(build), _partially_initialized(false), |
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118 _thread_park_blocker(thread_park_blocker) {} |
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119 |
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120 // Returns the current running JDK version |
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121 static JDK_Version current() { return _current; } |
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122 |
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123 // Factory methods for convenience |
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124 static JDK_Version jdk(uint8_t m) { |
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125 return JDK_Version(m); |
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126 } |
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127 |
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128 static JDK_Version jdk_update(uint8_t major, uint8_t update_number) { |
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129 return JDK_Version(major, 0, 0, update_number); |
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130 } |
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131 |
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132 uint8_t major_version() const { return _major; } |
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133 uint8_t minor_version() const { return _minor; } |
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134 uint8_t micro_version() const { return _micro; } |
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135 uint8_t update_version() const { return _update; } |
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136 uint8_t special_update_version() const { return _special; } |
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137 uint8_t build_number() const { return _build; } |
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138 |
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139 bool supports_thread_park_blocker() const { |
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140 return _thread_park_blocker; |
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141 } |
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142 |
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143 // Performs a full ordering comparison using all fields (update, build, etc.) |
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144 int compare(const JDK_Version& other) const; |
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145 |
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146 /** |
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147 * Performs comparison using only the major version, returning negative |
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148 * if the major version of 'this' is less than the parameter, 0 if it is |
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149 * equal, and a positive value if it is greater. |
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150 */ |
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151 int compare_major(int version) const { |
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152 if (_partially_initialized) { |
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153 if (version >= 6) { |
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154 return -1; |
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155 } else { |
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156 assert(false, "Can't make this comparison during init time"); |
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157 return -1; // conservative |
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158 } |
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159 } else { |
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160 return major_version() - version; |
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161 } |
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162 } |
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163 |
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164 void to_string(char* buffer, size_t buflen) const; |
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165 |
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166 // Convenience methods for queries on the current major/minor version |
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167 static bool is_jdk12x_version() { |
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168 return current().compare_major(2) == 0; |
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169 } |
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170 |
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171 static bool is_jdk13x_version() { |
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172 return current().compare_major(3) == 0; |
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173 } |
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174 |
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175 static bool is_jdk14x_version() { |
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176 return current().compare_major(4) == 0; |
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177 } |
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178 |
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179 static bool is_jdk15x_version() { |
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180 return current().compare_major(5) == 0; |
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181 } |
71 |
182 |
72 static bool is_jdk16x_version() { |
183 static bool is_jdk16x_version() { |
73 if (is_jdk_version_initialized()) { |
184 return current().compare_major(6) == 0; |
74 return _jdk_version == 6; |
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75 } else { |
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76 assert(is_pre_jdk16_version(), "must have been initialized"); |
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77 return false; |
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78 } |
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79 } |
185 } |
80 |
186 |
81 static bool is_jdk17x_version() { |
187 static bool is_jdk17x_version() { |
82 if (is_jdk_version_initialized()) { |
188 return current().compare_major(7) == 0; |
83 return _jdk_version == 7; |
189 } |
84 } else { |
190 |
85 assert(is_pre_jdk16_version(), "must have been initialized"); |
191 static bool is_gte_jdk13x_version() { |
86 return false; |
192 return current().compare_major(3) >= 0; |
87 } |
193 } |
88 } |
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89 |
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90 static bool supports_thread_park_blocker() { return _version_info.thread_park_blocker; } |
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91 |
194 |
92 static bool is_gte_jdk14x_version() { |
195 static bool is_gte_jdk14x_version() { |
93 // Keep the semantics of this that the version number is >= 1.4 |
196 return current().compare_major(4) >= 0; |
94 assert(is_jdk_version_initialized(), "Not initialized"); |
197 } |
95 return _jdk_version >= 4; |
198 |
96 } |
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97 static bool is_gte_jdk15x_version() { |
199 static bool is_gte_jdk15x_version() { |
98 // Keep the semantics of this that the version number is >= 1.5 |
200 return current().compare_major(5) >= 0; |
99 assert(is_jdk_version_initialized(), "Not initialized"); |
201 } |
100 return _jdk_version >= 5; |
202 |
101 } |
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102 static bool is_gte_jdk16x_version() { |
203 static bool is_gte_jdk16x_version() { |
103 // Keep the semantics of this that the version number is >= 1.6 |
204 return current().compare_major(6) >= 0; |
104 if (is_jdk_version_initialized()) { |
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105 return _jdk_version >= 6; |
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106 } else { |
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107 assert(is_pre_jdk16_version(), "Not initialized"); |
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108 return false; |
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109 } |
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110 } |
205 } |
111 |
206 |
112 static bool is_gte_jdk17x_version() { |
207 static bool is_gte_jdk17x_version() { |
113 // Keep the semantics of this that the version number is >= 1.7 |
208 return current().compare_major(7) >= 0; |
114 if (is_jdk_version_initialized()) { |
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115 return _jdk_version >= 7; |
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116 } else { |
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117 assert(is_pre_jdk16_version(), "Not initialized"); |
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118 return false; |
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119 } |
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120 } |
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121 |
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122 static bool is_jdk_version_initialized() { |
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123 return _jdk_version > 0; |
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124 } |
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125 |
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126 // These methods are defined to deal with pre JDK 1.6 versions |
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127 static void set_jdk12x_version() { |
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128 assert(_pre_jdk16_version && !is_jdk_version_initialized(), "must not initialize"); |
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129 _jdk_version = 2; |
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130 _version_info.jdk_version = (1 << 24) | (2 << 16); |
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131 } |
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132 static void set_jdk13x_version() { |
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133 assert(_pre_jdk16_version && !is_jdk_version_initialized(), "must not initialize"); |
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134 _jdk_version = 3; |
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135 _version_info.jdk_version = (1 << 24) | (3 << 16); |
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136 } |
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137 static void set_jdk14x_version() { |
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138 assert(_pre_jdk16_version && !is_jdk_version_initialized(), "must not initialize"); |
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139 _jdk_version = 4; |
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140 _version_info.jdk_version = (1 << 24) | (4 << 16); |
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141 } |
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142 static void set_jdk15x_version() { |
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143 assert(_pre_jdk16_version && !is_jdk_version_initialized(), "must not initialize"); |
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144 _jdk_version = 5; |
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145 _version_info.jdk_version = (1 << 24) | (5 << 16); |
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146 } |
209 } |
147 }; |
210 }; |