Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/code/relocInfo.hpp
src/share/vm/code/relocInfo.hpp
- changeset 6447
- 53fa76359eb1
- parent 5314
- 7875ea94bea5
- child 6461
- bdd155477289
equal
deleted
inserted
replaced
| 6446:583211d4b16b | 6447:53fa76359eb1 |
|---|---|
| 258 internal_word_type = 8, // reference within the current code blob | 258 internal_word_type = 8, // reference within the current code blob |
| 259 section_word_type = 9, // internal, but a cross-section reference | 259 section_word_type = 9, // internal, but a cross-section reference |
| 260 poll_type = 10, // polling instruction for safepoints | 260 poll_type = 10, // polling instruction for safepoints |
| 261 poll_return_type = 11, // polling instruction for safepoints at return | 261 poll_return_type = 11, // polling instruction for safepoints at return |
| 262 metadata_type = 12, // metadata that used to be oops | 262 metadata_type = 12, // metadata that used to be oops |
| 263 yet_unused_type_1 = 13, // Still unused | 263 trampoline_stub_type = 13, // stub-entry for trampoline |
| 264 yet_unused_type_2 = 14, // Still unused | 264 yet_unused_type_1 = 14, // Still unused |
| 265 data_prefix_tag = 15, // tag for a prefix (carries data arguments) | 265 data_prefix_tag = 15, // tag for a prefix (carries data arguments) |
| 266 type_mask = 15 // A mask which selects only the above values | 266 type_mask = 15 // A mask which selects only the above values |
| 267 }; | 267 }; |
| 268 | 268 |
| 269 protected: | 269 protected: |
| 299 visitor(external_word) \ | 299 visitor(external_word) \ |
| 300 visitor(internal_word) \ | 300 visitor(internal_word) \ |
| 301 visitor(poll) \ | 301 visitor(poll) \ |
| 302 visitor(poll_return) \ | 302 visitor(poll_return) \ |
| 303 visitor(section_word) \ | 303 visitor(section_word) \ |
| 304 visitor(trampoline_stub) \ | |
| 304 | 305 |
| 305 | 306 |
| 306 public: | 307 public: |
| 307 enum { | 308 enum { |
| 308 value_width = sizeof(unsigned short) * BitsPerByte, | 309 value_width = sizeof(unsigned short) * BitsPerByte, |
| 1148 runtime_call_Relocation() { } | 1149 runtime_call_Relocation() { } |
| 1149 | 1150 |
| 1150 public: | 1151 public: |
| 1151 }; | 1152 }; |
| 1152 | 1153 |
| 1154 // Trampoline Relocations. | |
| 1155 // A trampoline allows to encode a small branch in the code, even if there | |
| 1156 // is the chance that this branch can not reach all possible code locations. | |
| 1157 // If the relocation finds that a branch is too far for the instruction | |
| 1158 // in the code, it can patch it to jump to the trampoline where is | |
| 1159 // sufficient space for a far branch. Needed on PPC. | |
| 1160 class trampoline_stub_Relocation : public Relocation { | |
| 1161 relocInfo::relocType type() { return relocInfo::trampoline_stub_type; } | |
| 1162 | |
| 1163 public: | |
| 1164 static RelocationHolder spec(address static_call) { | |
| 1165 RelocationHolder rh = newHolder(); | |
| 1166 return (new (rh) trampoline_stub_Relocation(static_call)); | |
| 1167 } | |
| 1168 | |
| 1169 private: | |
| 1170 address _owner; // Address of the NativeCall that owns the trampoline. | |
| 1171 | |
| 1172 trampoline_stub_Relocation(address owner) { | |
| 1173 _owner = owner; | |
| 1174 } | |
| 1175 | |
| 1176 friend class RelocIterator; | |
| 1177 trampoline_stub_Relocation() { } | |
| 1178 | |
| 1179 public: | |
| 1180 | |
| 1181 // Return the address of the NativeCall that owns the trampoline. | |
| 1182 address owner() { return _owner; } | |
| 1183 | |
| 1184 void pack_data_to(CodeSection * dest); | |
| 1185 void unpack_data(); | |
| 1186 | |
| 1187 // Find the trampoline stub for a call. | |
| 1188 static address get_trampoline_for(address call, nmethod* code); | |
| 1189 }; | |
| 1190 | |
| 1153 class external_word_Relocation : public DataRelocation { | 1191 class external_word_Relocation : public DataRelocation { |
| 1154 relocInfo::relocType type() { return relocInfo::external_word_type; } | 1192 relocInfo::relocType type() { return relocInfo::external_word_type; } |
| 1155 | 1193 |
| 1156 public: | 1194 public: |
| 1157 static RelocationHolder spec(address target) { | 1195 static RelocationHolder spec(address target) { |
