Mercurial > hg > truffle
annotate src/share/vm/code/relocInfo.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 6c97c830fb6f |
| children | 7875ea94bea5 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CODE_RELOCINFO_HPP |
| 26 #define SHARE_VM_CODE_RELOCINFO_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "utilities/top.hpp" | |
| 30 | |
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31 class NativeMovConstReg; |
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32 |
| 0 | 33 // Types in this file: |
| 34 // relocInfo | |
| 35 // One element of an array of halfwords encoding compressed relocations. | |
| 36 // Also, the source of relocation types (relocInfo::oop_type, ...). | |
| 37 // Relocation | |
| 38 // A flyweight object representing a single relocation. | |
| 39 // It is fully unpacked from the compressed relocation array. | |
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40 // metadata_Relocation, ... (subclasses of Relocation) |
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41 // The location of some type-specific operations (metadata_addr, ...). |
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42 // Also, the source of relocation specs (metadata_Relocation::spec, ...). |
| 0 | 43 // oop_Relocation, ... (subclasses of Relocation) |
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44 // oops in the code stream (strings, class loaders) |
| 0 | 45 // Also, the source of relocation specs (oop_Relocation::spec, ...). |
| 46 // RelocationHolder | |
| 47 // A ValueObj type which acts as a union holding a Relocation object. | |
| 48 // Represents a relocation spec passed into a CodeBuffer during assembly. | |
| 49 // RelocIterator | |
| 50 // A StackObj which iterates over the relocations associated with | |
| 51 // a range of code addresses. Can be used to operate a copy of code. | |
| 52 // PatchingRelocIterator | |
| 53 // Specialized subtype of RelocIterator which removes breakpoints | |
| 54 // temporarily during iteration, then restores them. | |
| 55 // BoundRelocation | |
| 56 // An _internal_ type shared by packers and unpackers of relocations. | |
| 57 // It pastes together a RelocationHolder with some pointers into | |
| 58 // code and relocInfo streams. | |
| 59 | |
| 60 | |
| 61 // Notes on relocType: | |
| 62 // | |
| 63 // These hold enough information to read or write a value embedded in | |
| 64 // the instructions of an CodeBlob. They're used to update: | |
| 65 // | |
| 66 // 1) embedded oops (isOop() == true) | |
| 67 // 2) inline caches (isIC() == true) | |
| 68 // 3) runtime calls (isRuntimeCall() == true) | |
| 69 // 4) internal word ref (isInternalWord() == true) | |
| 70 // 5) external word ref (isExternalWord() == true) | |
| 71 // | |
| 72 // when objects move (GC) or if code moves (compacting the code heap). | |
| 73 // They are also used to patch the code (if a call site must change) | |
| 74 // | |
| 75 // A relocInfo is represented in 16 bits: | |
| 76 // 4 bits indicating the relocation type | |
| 77 // 12 bits indicating the offset from the previous relocInfo address | |
| 78 // | |
| 79 // The offsets accumulate along the relocInfo stream to encode the | |
| 80 // address within the CodeBlob, which is named RelocIterator::addr(). | |
| 81 // The address of a particular relocInfo always points to the first | |
| 82 // byte of the relevant instruction (and not to any of its subfields | |
| 83 // or embedded immediate constants). | |
| 84 // | |
| 85 // The offset value is scaled appropriately for the target machine. | |
| 86 // (See relocInfo_<arch>.hpp for the offset scaling.) | |
| 87 // | |
| 88 // On some machines, there may also be a "format" field which may provide | |
| 89 // additional information about the format of the instruction stream | |
| 90 // at the corresponding code address. The format value is usually zero. | |
| 91 // Any machine (such as Intel) whose instructions can sometimes contain | |
| 92 // more than one relocatable constant needs format codes to distinguish | |
| 93 // which operand goes with a given relocation. | |
| 94 // | |
| 95 // If the target machine needs N format bits, the offset has 12-N bits, | |
| 96 // the format is encoded between the offset and the type, and the | |
| 97 // relocInfo_<arch>.hpp file has manifest constants for the format codes. | |
| 98 // | |
| 99 // If the type is "data_prefix_tag" then the offset bits are further encoded, | |
| 100 // and in fact represent not a code-stream offset but some inline data. | |
| 101 // The data takes the form of a counted sequence of halfwords, which | |
| 102 // precedes the actual relocation record. (Clients never see it directly.) | |
| 103 // The interpetation of this extra data depends on the relocation type. | |
| 104 // | |
| 105 // On machines that have 32-bit immediate fields, there is usually | |
| 106 // little need for relocation "prefix" data, because the instruction stream | |
| 107 // is a perfectly reasonable place to store the value. On machines in | |
| 108 // which 32-bit values must be "split" across instructions, the relocation | |
| 109 // data is the "true" specification of the value, which is then applied | |
| 110 // to some field of the instruction (22 or 13 bits, on SPARC). | |
| 111 // | |
| 112 // Whenever the location of the CodeBlob changes, any PC-relative | |
| 113 // relocations, and any internal_word_type relocations, must be reapplied. | |
| 114 // After the GC runs, oop_type relocations must be reapplied. | |
| 115 // | |
| 116 // | |
| 117 // Here are meanings of the types: | |
| 118 // | |
| 119 // relocInfo::none -- a filler record | |
| 120 // Value: none | |
| 121 // Instruction: The corresponding code address is ignored | |
| 122 // Data: Any data prefix and format code are ignored | |
| 123 // (This means that any relocInfo can be disabled by setting | |
| 124 // its type to none. See relocInfo::remove.) | |
| 125 // | |
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126 // relocInfo::oop_type, relocInfo::metadata_type -- a reference to an oop or meta data |
| 0 | 127 // Value: an oop, or else the address (handle) of an oop |
| 128 // Instruction types: memory (load), set (load address) | |
| 129 // Data: [] an oop stored in 4 bytes of instruction | |
| 130 // [n] n is the index of an oop in the CodeBlob's oop pool | |
| 131 // [[N]n l] and l is a byte offset to be applied to the oop | |
| 132 // [Nn Ll] both index and offset may be 32 bits if necessary | |
| 133 // Here is a special hack, used only by the old compiler: | |
| 134 // [[N]n 00] the value is the __address__ of the nth oop in the pool | |
| 135 // (Note that the offset allows optimal references to class variables.) | |
| 136 // | |
| 137 // relocInfo::internal_word_type -- an address within the same CodeBlob | |
| 138 // relocInfo::section_word_type -- same, but can refer to another section | |
| 139 // Value: an address in the CodeBlob's code or constants section | |
| 140 // Instruction types: memory (load), set (load address) | |
| 141 // Data: [] stored in 4 bytes of instruction | |
| 142 // [[L]l] a relative offset (see [About Offsets] below) | |
| 143 // In the case of section_word_type, the offset is relative to a section | |
| 144 // base address, and the section number (e.g., SECT_INSTS) is encoded | |
| 145 // into the low two bits of the offset L. | |
| 146 // | |
| 147 // relocInfo::external_word_type -- a fixed address in the runtime system | |
| 148 // Value: an address | |
| 149 // Instruction types: memory (load), set (load address) | |
| 150 // Data: [] stored in 4 bytes of instruction | |
| 151 // [n] the index of a "well-known" stub (usual case on RISC) | |
| 152 // [Ll] a 32-bit address | |
| 153 // | |
| 154 // relocInfo::runtime_call_type -- a fixed subroutine in the runtime system | |
| 155 // Value: an address | |
| 156 // Instruction types: PC-relative call (or a PC-relative branch) | |
| 157 // Data: [] stored in 4 bytes of instruction | |
| 158 // | |
| 159 // relocInfo::static_call_type -- a static call | |
| 160 // Value: an CodeBlob, a stub, or a fixup routine | |
| 161 // Instruction types: a call | |
| 162 // Data: [] | |
| 163 // The identity of the callee is extracted from debugging information. | |
| 164 // //%note reloc_3 | |
| 165 // | |
| 166 // relocInfo::virtual_call_type -- a virtual call site (which includes an inline | |
| 167 // cache) | |
| 168 // Value: an CodeBlob, a stub, the interpreter, or a fixup routine | |
| 169 // Instruction types: a call, plus some associated set-oop instructions | |
| 170 // Data: [] the associated set-oops are adjacent to the call | |
| 171 // [n] n is a relative offset to the first set-oop | |
| 172 // [[N]n l] and l is a limit within which the set-oops occur | |
| 173 // [Nn Ll] both n and l may be 32 bits if necessary | |
| 174 // The identity of the callee is extracted from debugging information. | |
| 175 // | |
| 176 // relocInfo::opt_virtual_call_type -- a virtual call site that is statically bound | |
| 177 // | |
| 178 // Same info as a static_call_type. We use a special type, so the handling of | |
| 179 // virtuals and statics are separated. | |
| 180 // | |
| 181 // | |
| 182 // The offset n points to the first set-oop. (See [About Offsets] below.) | |
| 183 // In turn, the set-oop instruction specifies or contains an oop cell devoted | |
| 184 // exclusively to the IC call, which can be patched along with the call. | |
| 185 // | |
| 186 // The locations of any other set-oops are found by searching the relocation | |
| 187 // information starting at the first set-oop, and continuing until all | |
| 188 // relocations up through l have been inspected. The value l is another | |
| 189 // relative offset. (Both n and l are relative to the call's first byte.) | |
| 190 // | |
| 191 // The limit l of the search is exclusive. However, if it points within | |
| 192 // the call (e.g., offset zero), it is adjusted to point after the call and | |
| 193 // any associated machine-specific delay slot. | |
| 194 // | |
| 195 // Since the offsets could be as wide as 32-bits, these conventions | |
| 196 // put no restrictions whatever upon code reorganization. | |
| 197 // | |
| 198 // The compiler is responsible for ensuring that transition from a clean | |
| 199 // state to a monomorphic compiled state is MP-safe. This implies that | |
| 200 // the system must respond well to intermediate states where a random | |
| 201 // subset of the set-oops has been correctly from the clean state | |
| 202 // upon entry to the VEP of the compiled method. In the case of a | |
| 203 // machine (Intel) with a single set-oop instruction, the 32-bit | |
| 204 // immediate field must not straddle a unit of memory coherence. | |
| 205 // //%note reloc_3 | |
| 206 // | |
| 207 // relocInfo::breakpoint_type -- a conditional breakpoint in the code | |
| 208 // Value: none | |
| 209 // Instruction types: any whatsoever | |
| 210 // Data: [b [T]t i...] | |
| 211 // The b is a bit-packed word representing the breakpoint's attributes. | |
| 212 // The t is a target address which the breakpoint calls (when it is enabled). | |
| 213 // The i... is a place to store one or two instruction words overwritten | |
| 214 // by a trap, so that the breakpoint may be subsequently removed. | |
| 215 // | |
| 216 // relocInfo::static_stub_type -- an extra stub for each static_call_type | |
| 217 // Value: none | |
| 218 // Instruction types: a virtual call: { set_oop; jump; } | |
| 219 // Data: [[N]n] the offset of the associated static_call reloc | |
| 220 // This stub becomes the target of a static call which must be upgraded | |
| 221 // to a virtual call (because the callee is interpreted). | |
| 222 // See [About Offsets] below. | |
| 223 // //%note reloc_2 | |
| 224 // | |
| 225 // For example: | |
| 226 // | |
| 227 // INSTRUCTIONS RELOC: TYPE PREFIX DATA | |
| 228 // ------------ ---- ----------- | |
| 229 // sethi %hi(myObject), R oop_type [n(myObject)] | |
| 230 // ld [R+%lo(myObject)+fldOffset], R2 oop_type [n(myObject) fldOffset] | |
| 231 // add R2, 1, R2 | |
| 232 // st R2, [R+%lo(myObject)+fldOffset] oop_type [n(myObject) fldOffset] | |
| 233 //%note reloc_1 | |
| 234 // | |
| 235 // This uses 4 instruction words, 8 relocation halfwords, | |
| 236 // and an entry (which is sharable) in the CodeBlob's oop pool, | |
| 237 // for a total of 36 bytes. | |
| 238 // | |
| 239 // Note that the compiler is responsible for ensuring the "fldOffset" when | |
| 240 // added to "%lo(myObject)" does not overflow the immediate fields of the | |
| 241 // memory instructions. | |
| 242 // | |
| 243 // | |
| 244 // [About Offsets] Relative offsets are supplied to this module as | |
| 245 // positive byte offsets, but they may be internally stored scaled | |
| 246 // and/or negated, depending on what is most compact for the target | |
| 247 // system. Since the object pointed to by the offset typically | |
| 248 // precedes the relocation address, it is profitable to store | |
| 249 // these negative offsets as positive numbers, but this decision | |
| 250 // is internal to the relocation information abstractions. | |
| 251 // | |
| 252 | |
| 253 class Relocation; | |
| 254 class CodeBuffer; | |
| 255 class CodeSection; | |
| 256 class RelocIterator; | |
| 257 | |
| 258 class relocInfo VALUE_OBJ_CLASS_SPEC { | |
| 259 friend class RelocIterator; | |
| 260 public: | |
| 261 enum relocType { | |
| 262 none = 0, // Used when no relocation should be generated | |
| 263 oop_type = 1, // embedded oop | |
| 264 virtual_call_type = 2, // a standard inline cache call for a virtual send | |
| 265 opt_virtual_call_type = 3, // a virtual call that has been statically bound (i.e., no IC cache) | |
| 266 static_call_type = 4, // a static send | |
| 267 static_stub_type = 5, // stub-entry for static send (takes care of interpreter case) | |
| 268 runtime_call_type = 6, // call to fixed external routine | |
| 269 external_word_type = 7, // reference to fixed external address | |
| 270 internal_word_type = 8, // reference within the current code blob | |
| 271 section_word_type = 9, // internal, but a cross-section reference | |
| 272 poll_type = 10, // polling instruction for safepoints | |
| 273 poll_return_type = 11, // polling instruction for safepoints at return | |
| 274 breakpoint_type = 12, // an initialization barrier or safepoint | |
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275 metadata_type = 13, // metadata that used to be oops |
| 0 | 276 yet_unused_type_2 = 14, // Still unused |
| 277 data_prefix_tag = 15, // tag for a prefix (carries data arguments) | |
| 278 type_mask = 15 // A mask which selects only the above values | |
| 279 }; | |
| 280 | |
| 281 protected: | |
| 282 unsigned short _value; | |
| 283 | |
| 284 enum RawBitsToken { RAW_BITS }; | |
| 285 relocInfo(relocType type, RawBitsToken ignore, int bits) | |
| 286 : _value((type << nontype_width) + bits) { } | |
| 287 | |
| 288 relocInfo(relocType type, RawBitsToken ignore, int off, int f) | |
| 289 : _value((type << nontype_width) + (off / (unsigned)offset_unit) + (f << offset_width)) { } | |
| 290 | |
| 291 public: | |
| 292 // constructor | |
| 293 relocInfo(relocType type, int offset, int format = 0) | |
| 294 #ifndef ASSERT | |
| 295 { | |
| 296 (*this) = relocInfo(type, RAW_BITS, offset, format); | |
| 297 } | |
| 298 #else | |
| 299 // Put a bunch of assertions out-of-line. | |
| 300 ; | |
| 301 #endif | |
| 302 | |
| 303 #define APPLY_TO_RELOCATIONS(visitor) \ | |
| 304 visitor(oop) \ | |
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305 visitor(metadata) \ |
| 0 | 306 visitor(virtual_call) \ |
| 307 visitor(opt_virtual_call) \ | |
| 308 visitor(static_call) \ | |
| 309 visitor(static_stub) \ | |
| 310 visitor(runtime_call) \ | |
| 311 visitor(external_word) \ | |
| 312 visitor(internal_word) \ | |
| 313 visitor(poll) \ | |
| 314 visitor(poll_return) \ | |
| 315 visitor(breakpoint) \ | |
| 316 visitor(section_word) \ | |
| 317 | |
| 318 | |
| 319 public: | |
| 320 enum { | |
| 321 value_width = sizeof(unsigned short) * BitsPerByte, | |
| 322 type_width = 4, // == log2(type_mask+1) | |
| 323 nontype_width = value_width - type_width, | |
| 324 datalen_width = nontype_width-1, | |
| 325 datalen_tag = 1 << datalen_width, // or-ed into _value | |
| 326 datalen_limit = 1 << datalen_width, | |
| 327 datalen_mask = (1 << datalen_width)-1 | |
| 328 }; | |
| 329 | |
| 330 // accessors | |
| 331 public: | |
| 332 relocType type() const { return (relocType)((unsigned)_value >> nontype_width); } | |
| 333 int format() const { return format_mask==0? 0: format_mask & | |
| 334 ((unsigned)_value >> offset_width); } | |
| 335 int addr_offset() const { assert(!is_prefix(), "must have offset"); | |
| 336 return (_value & offset_mask)*offset_unit; } | |
| 337 | |
| 338 protected: | |
| 339 const short* data() const { assert(is_datalen(), "must have data"); | |
| 340 return (const short*)(this + 1); } | |
| 341 int datalen() const { assert(is_datalen(), "must have data"); | |
| 342 return (_value & datalen_mask); } | |
| 343 int immediate() const { assert(is_immediate(), "must have immed"); | |
| 344 return (_value & datalen_mask); } | |
| 345 public: | |
| 346 static int addr_unit() { return offset_unit; } | |
| 347 static int offset_limit() { return (1 << offset_width) * offset_unit; } | |
| 348 | |
| 349 void set_type(relocType type); | |
| 350 void set_format(int format); | |
| 351 | |
| 352 void remove() { set_type(none); } | |
| 353 | |
| 354 protected: | |
| 355 bool is_none() const { return type() == none; } | |
| 356 bool is_prefix() const { return type() == data_prefix_tag; } | |
| 357 bool is_datalen() const { assert(is_prefix(), "must be prefix"); | |
| 358 return (_value & datalen_tag) != 0; } | |
| 359 bool is_immediate() const { assert(is_prefix(), "must be prefix"); | |
| 360 return (_value & datalen_tag) == 0; } | |
| 361 | |
| 362 public: | |
| 363 // Occasionally records of type relocInfo::none will appear in the stream. | |
| 364 // We do not bother to filter these out, but clients should ignore them. | |
| 365 // These records serve as "filler" in three ways: | |
| 366 // - to skip large spans of unrelocated code (this is rare) | |
| 367 // - to pad out the relocInfo array to the required oop alignment | |
| 368 // - to disable old relocation information which is no longer applicable | |
| 369 | |
| 370 inline friend relocInfo filler_relocInfo(); | |
| 371 | |
| 372 // Every non-prefix relocation may be preceded by at most one prefix, | |
| 373 // which supplies 1 or more halfwords of associated data. Conventionally, | |
| 374 // an int is represented by 0, 1, or 2 halfwords, depending on how | |
| 375 // many bits are required to represent the value. (In addition, | |
| 376 // if the sole halfword is a 10-bit unsigned number, it is made | |
| 377 // "immediate" in the prefix header word itself. This optimization | |
| 378 // is invisible outside this module.) | |
| 379 | |
| 380 inline friend relocInfo prefix_relocInfo(int datalen = 0); | |
| 381 | |
| 382 protected: | |
| 383 // an immediate relocInfo optimizes a prefix with one 10-bit unsigned value | |
| 384 static relocInfo immediate_relocInfo(int data0) { | |
| 385 assert(fits_into_immediate(data0), "data0 in limits"); | |
| 386 return relocInfo(relocInfo::data_prefix_tag, RAW_BITS, data0); | |
| 387 } | |
| 388 static bool fits_into_immediate(int data0) { | |
| 389 return (data0 >= 0 && data0 < datalen_limit); | |
| 390 } | |
| 391 | |
| 392 public: | |
| 393 // Support routines for compilers. | |
| 394 | |
| 395 // This routine takes an infant relocInfo (unprefixed) and | |
| 396 // edits in its prefix, if any. It also updates dest.locs_end. | |
| 397 void initialize(CodeSection* dest, Relocation* reloc); | |
| 398 | |
| 399 // This routine updates a prefix and returns the limit pointer. | |
| 400 // It tries to compress the prefix from 32 to 16 bits, and if | |
| 401 // successful returns a reduced "prefix_limit" pointer. | |
| 402 relocInfo* finish_prefix(short* prefix_limit); | |
| 403 | |
| 404 // bit-packers for the data array: | |
| 405 | |
| 406 // As it happens, the bytes within the shorts are ordered natively, | |
| 407 // but the shorts within the word are ordered big-endian. | |
| 408 // This is an arbitrary choice, made this way mainly to ease debugging. | |
| 409 static int data0_from_int(jint x) { return x >> value_width; } | |
| 410 static int data1_from_int(jint x) { return (short)x; } | |
| 411 static jint jint_from_data(short* data) { | |
| 412 return (data[0] << value_width) + (unsigned short)data[1]; | |
| 413 } | |
| 414 | |
| 415 static jint short_data_at(int n, short* data, int datalen) { | |
| 416 return datalen > n ? data[n] : 0; | |
| 417 } | |
| 418 | |
| 419 static jint jint_data_at(int n, short* data, int datalen) { | |
| 420 return datalen > n+1 ? jint_from_data(&data[n]) : short_data_at(n, data, datalen); | |
| 421 } | |
| 422 | |
| 423 // Update methods for relocation information | |
| 424 // (since code is dynamically patched, we also need to dynamically update the relocation info) | |
| 425 // Both methods takes old_type, so it is able to performe sanity checks on the information removed. | |
| 426 static void change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type); | |
| 427 static void remove_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type); | |
| 428 | |
| 429 // Machine dependent stuff | |
| 1972 | 430 #ifdef TARGET_ARCH_x86 |
| 431 # include "relocInfo_x86.hpp" | |
| 432 #endif | |
| 433 #ifdef TARGET_ARCH_sparc | |
| 434 # include "relocInfo_sparc.hpp" | |
| 435 #endif | |
| 436 #ifdef TARGET_ARCH_zero | |
| 437 # include "relocInfo_zero.hpp" | |
| 438 #endif | |
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439 #ifdef TARGET_ARCH_arm |
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440 # include "relocInfo_arm.hpp" |
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441 #endif |
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442 #ifdef TARGET_ARCH_ppc |
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443 # include "relocInfo_ppc.hpp" |
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444 #endif |
| 1972 | 445 |
| 0 | 446 |
| 447 protected: | |
| 448 // Derived constant, based on format_width which is PD: | |
| 449 enum { | |
| 450 offset_width = nontype_width - format_width, | |
| 451 offset_mask = (1<<offset_width) - 1, | |
| 452 format_mask = (1<<format_width) - 1 | |
| 453 }; | |
| 454 public: | |
| 455 enum { | |
| 456 // Conservatively large estimate of maximum length (in shorts) | |
| 457 // of any relocation record (probably breakpoints are largest). | |
| 458 // Extended format is length prefix, data words, and tag/offset suffix. | |
| 459 length_limit = 1 + 1 + (3*BytesPerWord/BytesPerShort) + 1, | |
| 460 have_format = format_width > 0 | |
| 461 }; | |
| 462 }; | |
| 463 | |
| 464 #define FORWARD_DECLARE_EACH_CLASS(name) \ | |
| 465 class name##_Relocation; | |
| 466 APPLY_TO_RELOCATIONS(FORWARD_DECLARE_EACH_CLASS) | |
| 467 #undef FORWARD_DECLARE_EACH_CLASS | |
| 468 | |
| 469 | |
| 470 | |
| 471 inline relocInfo filler_relocInfo() { | |
| 472 return relocInfo(relocInfo::none, relocInfo::offset_limit() - relocInfo::offset_unit); | |
| 473 } | |
| 474 | |
| 475 inline relocInfo prefix_relocInfo(int datalen) { | |
| 476 assert(relocInfo::fits_into_immediate(datalen), "datalen in limits"); | |
| 477 return relocInfo(relocInfo::data_prefix_tag, relocInfo::RAW_BITS, relocInfo::datalen_tag | datalen); | |
| 478 } | |
| 479 | |
| 480 | |
| 481 // Holder for flyweight relocation objects. | |
| 482 // Although the flyweight subclasses are of varying sizes, | |
| 483 // the holder is "one size fits all". | |
| 484 class RelocationHolder VALUE_OBJ_CLASS_SPEC { | |
| 485 friend class Relocation; | |
| 486 friend class CodeSection; | |
| 487 | |
| 488 private: | |
| 489 // this preallocated memory must accommodate all subclasses of Relocation | |
| 490 // (this number is assertion-checked in Relocation::operator new) | |
| 491 enum { _relocbuf_size = 5 }; | |
| 492 void* _relocbuf[ _relocbuf_size ]; | |
| 493 | |
| 494 public: | |
| 495 Relocation* reloc() const { return (Relocation*) &_relocbuf[0]; } | |
| 496 inline relocInfo::relocType type() const; | |
| 497 | |
| 498 // Add a constant offset to a relocation. Helper for class Address. | |
| 499 RelocationHolder plus(int offset) const; | |
| 500 | |
| 501 inline RelocationHolder(); // initializes type to none | |
| 502 | |
| 503 inline RelocationHolder(Relocation* r); // make a copy | |
| 504 | |
| 505 static const RelocationHolder none; | |
| 506 }; | |
| 507 | |
| 508 // A RelocIterator iterates through the relocation information of a CodeBlob. | |
| 509 // It is a variable BoundRelocation which is able to take on successive | |
| 510 // values as it is advanced through a code stream. | |
| 511 // Usage: | |
| 512 // RelocIterator iter(nm); | |
| 513 // while (iter.next()) { | |
| 514 // iter.reloc()->some_operation(); | |
| 515 // } | |
| 516 // or: | |
| 517 // RelocIterator iter(nm); | |
| 518 // while (iter.next()) { | |
| 519 // switch (iter.type()) { | |
| 520 // case relocInfo::oop_type : | |
| 521 // case relocInfo::ic_type : | |
| 522 // case relocInfo::prim_type : | |
| 523 // case relocInfo::uncommon_type : | |
| 524 // case relocInfo::runtime_call_type : | |
| 525 // case relocInfo::internal_word_type: | |
| 526 // case relocInfo::external_word_type: | |
| 527 // ... | |
| 528 // } | |
| 529 // } | |
| 530 | |
| 531 class RelocIterator : public StackObj { | |
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532 enum { SECT_LIMIT = 3 }; // must be equal to CodeBuffer::SECT_LIMIT, checked in ctor |
| 0 | 533 friend class Relocation; |
| 534 friend class relocInfo; // for change_reloc_info_for_address only | |
| 535 typedef relocInfo::relocType relocType; | |
| 536 | |
| 537 private: | |
| 538 address _limit; // stop producing relocations after this _addr | |
| 539 relocInfo* _current; // the current relocation information | |
| 540 relocInfo* _end; // end marker; we're done iterating when _current == _end | |
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541 nmethod* _code; // compiled method containing _addr |
| 0 | 542 address _addr; // instruction to which the relocation applies |
| 543 short _databuf; // spare buffer for compressed data | |
| 544 short* _data; // pointer to the relocation's data | |
| 545 short _datalen; // number of halfwords in _data | |
| 546 char _format; // position within the instruction | |
| 547 | |
| 548 // Base addresses needed to compute targets of section_word_type relocs. | |
| 549 address _section_start[SECT_LIMIT]; | |
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550 address _section_end [SECT_LIMIT]; |
| 0 | 551 |
| 552 void set_has_current(bool b) { | |
| 553 _datalen = !b ? -1 : 0; | |
| 554 debug_only(_data = NULL); | |
| 555 } | |
| 556 void set_current(relocInfo& ri) { | |
| 557 _current = &ri; | |
| 558 set_has_current(true); | |
| 559 } | |
| 560 | |
| 561 RelocationHolder _rh; // where the current relocation is allocated | |
| 562 | |
| 563 relocInfo* current() const { assert(has_current(), "must have current"); | |
| 564 return _current; } | |
| 565 | |
| 566 void set_limits(address begin, address limit); | |
| 567 | |
| 568 void advance_over_prefix(); // helper method | |
| 569 | |
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570 void initialize_misc(); |
| 0 | 571 |
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572 void initialize(nmethod* nm, address begin, address limit); |
| 0 | 573 |
| 574 friend class PatchingRelocIterator; | |
| 575 // make an uninitialized one, for PatchingRelocIterator: | |
| 576 RelocIterator() { initialize_misc(); } | |
| 577 | |
| 578 public: | |
| 579 // constructor | |
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580 RelocIterator(nmethod* nm, address begin = NULL, address limit = NULL); |
| 0 | 581 RelocIterator(CodeSection* cb, address begin = NULL, address limit = NULL); |
| 582 | |
| 583 // get next reloc info, return !eos | |
| 584 bool next() { | |
| 585 _current++; | |
| 586 assert(_current <= _end, "must not overrun relocInfo"); | |
| 587 if (_current == _end) { | |
| 588 set_has_current(false); | |
| 589 return false; | |
| 590 } | |
| 591 set_has_current(true); | |
| 592 | |
| 593 if (_current->is_prefix()) { | |
| 594 advance_over_prefix(); | |
| 595 assert(!current()->is_prefix(), "only one prefix at a time"); | |
| 596 } | |
| 597 | |
| 598 _addr += _current->addr_offset(); | |
| 599 | |
| 600 if (_limit != NULL && _addr >= _limit) { | |
| 601 set_has_current(false); | |
| 602 return false; | |
| 603 } | |
| 604 | |
| 605 if (relocInfo::have_format) _format = current()->format(); | |
| 606 return true; | |
| 607 } | |
| 608 | |
| 609 // accessors | |
| 610 address limit() const { return _limit; } | |
| 611 void set_limit(address x); | |
| 612 relocType type() const { return current()->type(); } | |
| 613 int format() const { return (relocInfo::have_format) ? current()->format() : 0; } | |
| 614 address addr() const { return _addr; } | |
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615 nmethod* code() const { return _code; } |
| 0 | 616 short* data() const { return _data; } |
| 617 int datalen() const { return _datalen; } | |
| 618 bool has_current() const { return _datalen >= 0; } | |
| 619 | |
| 620 void set_addr(address addr) { _addr = addr; } | |
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621 bool addr_in_const() const; |
| 0 | 622 |
| 623 address section_start(int n) const { | |
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624 assert(_section_start[n], "must be initialized"); |
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625 return _section_start[n]; |
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626 } |
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627 address section_end(int n) const { |
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628 assert(_section_end[n], "must be initialized"); |
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629 return _section_end[n]; |
| 0 | 630 } |
| 631 | |
| 632 // The address points to the affected displacement part of the instruction. | |
| 633 // For RISC, this is just the whole instruction. | |
| 634 // For Intel, this is an unaligned 32-bit word. | |
| 635 | |
| 636 // type-specific relocation accessors: oop_Relocation* oop_reloc(), etc. | |
| 637 #define EACH_TYPE(name) \ | |
| 638 inline name##_Relocation* name##_reloc(); | |
| 639 APPLY_TO_RELOCATIONS(EACH_TYPE) | |
| 640 #undef EACH_TYPE | |
| 641 // generic relocation accessor; switches on type to call the above | |
| 642 Relocation* reloc(); | |
| 643 | |
| 644 // CodeBlob's have relocation indexes for faster random access: | |
| 645 static int locs_and_index_size(int code_size, int locs_size); | |
| 646 // Store an index into [dest_start+dest_count..dest_end). | |
| 647 // At dest_start[0..dest_count] is the actual relocation information. | |
| 648 // Everything else up to dest_end is free space for the index. | |
| 649 static void create_index(relocInfo* dest_begin, int dest_count, relocInfo* dest_end); | |
| 650 | |
| 651 #ifndef PRODUCT | |
| 652 public: | |
| 653 void print(); | |
| 654 void print_current(); | |
| 655 #endif | |
| 656 }; | |
| 657 | |
| 658 | |
| 659 // A Relocation is a flyweight object allocated within a RelocationHolder. | |
| 660 // It represents the relocation data of relocation record. | |
| 661 // So, the RelocIterator unpacks relocInfos into Relocations. | |
| 662 | |
| 663 class Relocation VALUE_OBJ_CLASS_SPEC { | |
| 664 friend class RelocationHolder; | |
| 665 friend class RelocIterator; | |
| 666 | |
| 667 private: | |
| 668 static void guarantee_size(); | |
| 669 | |
| 670 // When a relocation has been created by a RelocIterator, | |
| 671 // this field is non-null. It allows the relocation to know | |
| 672 // its context, such as the address to which it applies. | |
| 673 RelocIterator* _binding; | |
| 674 | |
| 675 protected: | |
| 676 RelocIterator* binding() const { | |
| 677 assert(_binding != NULL, "must be bound"); | |
| 678 return _binding; | |
| 679 } | |
| 680 void set_binding(RelocIterator* b) { | |
| 681 assert(_binding == NULL, "must be unbound"); | |
| 682 _binding = b; | |
| 683 assert(_binding != NULL, "must now be bound"); | |
| 684 } | |
| 685 | |
| 686 Relocation() { | |
| 687 _binding = NULL; | |
| 688 } | |
| 689 | |
| 690 static RelocationHolder newHolder() { | |
| 691 return RelocationHolder(); | |
| 692 } | |
| 693 | |
| 694 public: | |
| 695 void* operator new(size_t size, const RelocationHolder& holder) { | |
| 696 if (size > sizeof(holder._relocbuf)) guarantee_size(); | |
| 697 assert((void* const *)holder.reloc() == &holder._relocbuf[0], "ptrs must agree"); | |
| 698 return holder.reloc(); | |
| 699 } | |
| 700 | |
| 701 // make a generic relocation for a given type (if possible) | |
| 702 static RelocationHolder spec_simple(relocInfo::relocType rtype); | |
| 703 | |
| 704 // here is the type-specific hook which writes relocation data: | |
| 705 virtual void pack_data_to(CodeSection* dest) { } | |
| 706 | |
| 707 // here is the type-specific hook which reads (unpacks) relocation data: | |
| 708 virtual void unpack_data() { | |
| 709 assert(datalen()==0 || type()==relocInfo::none, "no data here"); | |
| 710 } | |
| 711 | |
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712 static bool is_reloc_index(intptr_t index) { |
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713 return 0 < index && index < os::vm_page_size(); |
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714 } |
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715 |
| 0 | 716 protected: |
| 717 // Helper functions for pack_data_to() and unpack_data(). | |
| 718 | |
| 719 // Most of the compression logic is confined here. | |
| 720 // (The "immediate data" mechanism of relocInfo works independently | |
| 721 // of this stuff, and acts to further compress most 1-word data prefixes.) | |
| 722 | |
| 723 // A variable-width int is encoded as a short if it will fit in 16 bits. | |
| 724 // The decoder looks at datalen to decide whether to unpack short or jint. | |
| 725 // Most relocation records are quite simple, containing at most two ints. | |
| 726 | |
| 727 static bool is_short(jint x) { return x == (short)x; } | |
| 728 static short* add_short(short* p, int x) { *p++ = x; return p; } | |
| 729 static short* add_jint (short* p, jint x) { | |
| 730 *p++ = relocInfo::data0_from_int(x); *p++ = relocInfo::data1_from_int(x); | |
| 731 return p; | |
| 732 } | |
| 733 static short* add_var_int(short* p, jint x) { // add a variable-width int | |
| 734 if (is_short(x)) p = add_short(p, x); | |
| 735 else p = add_jint (p, x); | |
| 736 return p; | |
| 737 } | |
| 738 | |
| 739 static short* pack_1_int_to(short* p, jint x0) { | |
| 740 // Format is one of: [] [x] [Xx] | |
| 741 if (x0 != 0) p = add_var_int(p, x0); | |
| 742 return p; | |
| 743 } | |
| 744 int unpack_1_int() { | |
| 745 assert(datalen() <= 2, "too much data"); | |
| 746 return relocInfo::jint_data_at(0, data(), datalen()); | |
| 747 } | |
| 748 | |
| 749 // With two ints, the short form is used only if both ints are short. | |
| 750 short* pack_2_ints_to(short* p, jint x0, jint x1) { | |
| 751 // Format is one of: [] [x y?] [Xx Y?y] | |
| 752 if (x0 == 0 && x1 == 0) { | |
| 753 // no halfwords needed to store zeroes | |
| 754 } else if (is_short(x0) && is_short(x1)) { | |
| 755 // 1-2 halfwords needed to store shorts | |
| 756 p = add_short(p, x0); if (x1!=0) p = add_short(p, x1); | |
| 757 } else { | |
| 758 // 3-4 halfwords needed to store jints | |
| 759 p = add_jint(p, x0); p = add_var_int(p, x1); | |
| 760 } | |
| 761 return p; | |
| 762 } | |
| 763 void unpack_2_ints(jint& x0, jint& x1) { | |
| 764 int dlen = datalen(); | |
| 765 short* dp = data(); | |
| 766 if (dlen <= 2) { | |
| 767 x0 = relocInfo::short_data_at(0, dp, dlen); | |
| 768 x1 = relocInfo::short_data_at(1, dp, dlen); | |
| 769 } else { | |
| 770 assert(dlen <= 4, "too much data"); | |
| 771 x0 = relocInfo::jint_data_at(0, dp, dlen); | |
| 772 x1 = relocInfo::jint_data_at(2, dp, dlen); | |
| 773 } | |
| 774 } | |
| 775 | |
| 776 protected: | |
| 777 // platform-dependent utilities for decoding and patching instructions | |
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778 void pd_set_data_value (address x, intptr_t off, bool verify_only = false); // a set or mem-ref |
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779 void pd_verify_data_value (address x, intptr_t off) { pd_set_data_value(x, off, true); } |
| 0 | 780 address pd_call_destination (address orig_addr = NULL); |
| 781 void pd_set_call_destination (address x); | |
| 782 void pd_swap_in_breakpoint (address x, short* instrs, int instrlen); | |
| 783 void pd_swap_out_breakpoint (address x, short* instrs, int instrlen); | |
| 784 static int pd_breakpoint_size (); | |
| 785 | |
| 786 // this extracts the address of an address in the code stream instead of the reloc data | |
| 787 address* pd_address_in_code (); | |
| 788 | |
| 789 // this extracts an address from the code stream instead of the reloc data | |
| 790 address pd_get_address_from_code (); | |
| 791 | |
| 792 // these convert from byte offsets, to scaled offsets, to addresses | |
| 793 static jint scaled_offset(address x, address base) { | |
| 794 int byte_offset = x - base; | |
| 795 int offset = -byte_offset / relocInfo::addr_unit(); | |
| 796 assert(address_from_scaled_offset(offset, base) == x, "just checkin'"); | |
| 797 return offset; | |
| 798 } | |
| 799 static jint scaled_offset_null_special(address x, address base) { | |
| 800 // Some relocations treat offset=0 as meaning NULL. | |
| 801 // Handle this extra convention carefully. | |
| 802 if (x == NULL) return 0; | |
| 803 assert(x != base, "offset must not be zero"); | |
| 804 return scaled_offset(x, base); | |
| 805 } | |
| 806 static address address_from_scaled_offset(jint offset, address base) { | |
| 807 int byte_offset = -( offset * relocInfo::addr_unit() ); | |
| 808 return base + byte_offset; | |
| 809 } | |
| 810 | |
| 811 // these convert between indexes and addresses in the runtime system | |
| 812 static int32_t runtime_address_to_index(address runtime_address); | |
| 813 static address index_to_runtime_address(int32_t index); | |
| 814 | |
| 815 // helpers for mapping between old and new addresses after a move or resize | |
| 816 address old_addr_for(address newa, const CodeBuffer* src, CodeBuffer* dest); | |
| 817 address new_addr_for(address olda, const CodeBuffer* src, CodeBuffer* dest); | |
| 818 void normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections = false); | |
| 819 | |
| 820 public: | |
| 821 // accessors which only make sense for a bound Relocation | |
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822 address addr() const { return binding()->addr(); } |
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823 nmethod* code() const { return binding()->code(); } |
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824 bool addr_in_const() const { return binding()->addr_in_const(); } |
| 0 | 825 protected: |
| 826 short* data() const { return binding()->data(); } | |
| 827 int datalen() const { return binding()->datalen(); } | |
| 828 int format() const { return binding()->format(); } | |
| 829 | |
| 830 public: | |
| 831 virtual relocInfo::relocType type() { return relocInfo::none; } | |
| 832 | |
| 833 // is it a call instruction? | |
| 834 virtual bool is_call() { return false; } | |
| 835 | |
| 836 // is it a data movement instruction? | |
| 837 virtual bool is_data() { return false; } | |
| 838 | |
| 839 // some relocations can compute their own values | |
| 840 virtual address value(); | |
| 841 | |
| 842 // all relocations are able to reassert their values | |
| 843 virtual void set_value(address x); | |
| 844 | |
| 845 virtual void clear_inline_cache() { } | |
| 846 | |
| 847 // This method assumes that all virtual/static (inline) caches are cleared (since for static_call_type and | |
| 848 // ic_call_type is not always posisition dependent (depending on the state of the cache)). However, this is | |
| 849 // probably a reasonable assumption, since empty caches simplifies code reloacation. | |
| 850 virtual void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { } | |
| 851 | |
| 852 void print(); | |
| 853 }; | |
| 854 | |
| 855 | |
| 856 // certain inlines must be deferred until class Relocation is defined: | |
| 857 | |
| 858 inline RelocationHolder::RelocationHolder() { | |
| 859 // initialize the vtbl, just to keep things type-safe | |
| 860 new(*this) Relocation(); | |
| 861 } | |
| 862 | |
| 863 | |
| 864 inline RelocationHolder::RelocationHolder(Relocation* r) { | |
| 865 // wordwise copy from r (ok if it copies garbage after r) | |
| 866 for (int i = 0; i < _relocbuf_size; i++) { | |
| 867 _relocbuf[i] = ((void**)r)[i]; | |
| 868 } | |
| 869 } | |
| 870 | |
| 871 | |
| 872 relocInfo::relocType RelocationHolder::type() const { | |
| 873 return reloc()->type(); | |
| 874 } | |
| 875 | |
| 876 // A DataRelocation always points at a memory or load-constant instruction.. | |
| 877 // It is absolute on most machines, and the constant is split on RISCs. | |
| 878 // The specific subtypes are oop, external_word, and internal_word. | |
| 879 // By convention, the "value" does not include a separately reckoned "offset". | |
| 880 class DataRelocation : public Relocation { | |
| 881 public: | |
| 882 bool is_data() { return true; } | |
| 883 | |
| 884 // both target and offset must be computed somehow from relocation data | |
| 885 virtual int offset() { return 0; } | |
| 886 address value() = 0; | |
| 887 void set_value(address x) { set_value(x, offset()); } | |
| 888 void set_value(address x, intptr_t o) { | |
| 889 if (addr_in_const()) | |
| 890 *(address*)addr() = x; | |
| 891 else | |
| 892 pd_set_data_value(x, o); | |
| 893 } | |
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894 void verify_value(address x) { |
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895 if (addr_in_const()) |
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896 assert(*(address*)addr() == x, "must agree"); |
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897 else |
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898 pd_verify_data_value(x, offset()); |
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899 } |
| 0 | 900 |
| 901 // The "o" (displacement) argument is relevant only to split relocations | |
| 902 // on RISC machines. In some CPUs (SPARC), the set-hi and set-lo ins'ns | |
| 903 // can encode more than 32 bits between them. This allows compilers to | |
| 904 // share set-hi instructions between addresses that differ by a small | |
| 905 // offset (e.g., different static variables in the same class). | |
| 906 // On such machines, the "x" argument to set_value on all set-lo | |
| 907 // instructions must be the same as the "x" argument for the | |
| 908 // corresponding set-hi instructions. The "o" arguments for the | |
| 909 // set-hi instructions are ignored, and must not affect the high-half | |
| 910 // immediate constant. The "o" arguments for the set-lo instructions are | |
| 911 // added into the low-half immediate constant, and must not overflow it. | |
| 912 }; | |
| 913 | |
| 914 // A CallRelocation always points at a call instruction. | |
| 915 // It is PC-relative on most machines. | |
| 916 class CallRelocation : public Relocation { | |
| 917 public: | |
| 918 bool is_call() { return true; } | |
| 919 | |
| 920 address destination() { return pd_call_destination(); } | |
| 921 void set_destination(address x); // pd_set_call_destination | |
| 922 | |
| 923 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
| 924 address value() { return destination(); } | |
| 925 void set_value(address x) { set_destination(x); } | |
| 926 }; | |
| 927 | |
| 928 class oop_Relocation : public DataRelocation { | |
| 929 relocInfo::relocType type() { return relocInfo::oop_type; } | |
| 930 | |
| 931 public: | |
| 932 // encode in one of these formats: [] [n] [n l] [Nn l] [Nn Ll] | |
| 933 // an oop in the CodeBlob's oop pool | |
| 934 static RelocationHolder spec(int oop_index, int offset = 0) { | |
| 935 assert(oop_index > 0, "must be a pool-resident oop"); | |
| 936 RelocationHolder rh = newHolder(); | |
| 937 new(rh) oop_Relocation(oop_index, offset); | |
| 938 return rh; | |
| 939 } | |
| 940 // an oop in the instruction stream | |
| 941 static RelocationHolder spec_for_immediate() { | |
| 942 const int oop_index = 0; | |
| 943 const int offset = 0; // if you want an offset, use the oop pool | |
| 944 RelocationHolder rh = newHolder(); | |
| 945 new(rh) oop_Relocation(oop_index, offset); | |
| 946 return rh; | |
| 947 } | |
| 948 | |
| 949 private: | |
| 950 jint _oop_index; // if > 0, index into CodeBlob::oop_at | |
| 951 jint _offset; // byte offset to apply to the oop itself | |
| 952 | |
| 953 oop_Relocation(int oop_index, int offset) { | |
| 954 _oop_index = oop_index; _offset = offset; | |
| 955 } | |
| 956 | |
| 957 friend class RelocIterator; | |
| 958 oop_Relocation() { } | |
| 959 | |
| 960 public: | |
| 961 int oop_index() { return _oop_index; } | |
| 962 int offset() { return _offset; } | |
| 963 | |
| 964 // data is packed in "2_ints" format: [i o] or [Ii Oo] | |
| 965 void pack_data_to(CodeSection* dest); | |
| 966 void unpack_data(); | |
| 967 | |
| 968 void fix_oop_relocation(); // reasserts oop value | |
| 969 | |
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970 void verify_oop_relocation(); |
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971 |
| 0 | 972 address value() { return (address) *oop_addr(); } |
| 973 | |
| 974 bool oop_is_immediate() { return oop_index() == 0; } | |
| 975 | |
| 976 oop* oop_addr(); // addr or &pool[jint_data] | |
| 977 oop oop_value(); // *oop_addr | |
| 978 // Note: oop_value transparently converts Universe::non_oop_word to NULL. | |
| 979 }; | |
| 980 | |
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981 |
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982 // copy of oop_Relocation for now but may delete stuff in both/either |
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983 class metadata_Relocation : public DataRelocation { |
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984 relocInfo::relocType type() { return relocInfo::metadata_type; } |
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985 |
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986 public: |
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987 // encode in one of these formats: [] [n] [n l] [Nn l] [Nn Ll] |
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988 // an metadata in the CodeBlob's metadata pool |
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989 static RelocationHolder spec(int metadata_index, int offset = 0) { |
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990 assert(metadata_index > 0, "must be a pool-resident metadata"); |
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991 RelocationHolder rh = newHolder(); |
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992 new(rh) metadata_Relocation(metadata_index, offset); |
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993 return rh; |
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994 } |
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995 // an metadata in the instruction stream |
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996 static RelocationHolder spec_for_immediate() { |
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997 const int metadata_index = 0; |
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998 const int offset = 0; // if you want an offset, use the metadata pool |
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999 RelocationHolder rh = newHolder(); |
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1000 new(rh) metadata_Relocation(metadata_index, offset); |
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1001 return rh; |
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1002 } |
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1003 |
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1004 private: |
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1005 jint _metadata_index; // if > 0, index into nmethod::metadata_at |
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1006 jint _offset; // byte offset to apply to the metadata itself |
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1007 |
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1008 metadata_Relocation(int metadata_index, int offset) { |
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1009 _metadata_index = metadata_index; _offset = offset; |
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1010 } |
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1011 |
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1012 friend class RelocIterator; |
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1013 metadata_Relocation() { } |
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1014 |
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1015 // Fixes a Metadata pointer in the code. Most platforms embeds the |
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1016 // Metadata pointer in the code at compile time so this is empty |
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1017 // for them. |
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1018 void pd_fix_value(address x); |
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1019 |
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1020 public: |
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1021 int metadata_index() { return _metadata_index; } |
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1022 int offset() { return _offset; } |
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1023 |
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1024 // data is packed in "2_ints" format: [i o] or [Ii Oo] |
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1025 void pack_data_to(CodeSection* dest); |
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1026 void unpack_data(); |
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1027 |
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1028 void fix_metadata_relocation(); // reasserts metadata value |
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1029 |
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1030 void verify_metadata_relocation(); |
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1031 |
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1032 address value() { return (address) *metadata_addr(); } |
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1033 |
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1034 bool metadata_is_immediate() { return metadata_index() == 0; } |
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1035 |
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1036 Metadata** metadata_addr(); // addr or &pool[jint_data] |
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1037 Metadata* metadata_value(); // *metadata_addr |
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1038 // Note: metadata_value transparently converts Universe::non_metadata_word to NULL. |
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1039 }; |
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1040 |
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1041 |
| 0 | 1042 class virtual_call_Relocation : public CallRelocation { |
| 1043 relocInfo::relocType type() { return relocInfo::virtual_call_type; } | |
| 1044 | |
| 1045 public: | |
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1046 // "cached_value" points to the first associated set-oop. |
| 0 | 1047 // The oop_limit helps find the last associated set-oop. |
| 1048 // (See comments at the top of this file.) | |
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1049 static RelocationHolder spec(address cached_value) { |
| 0 | 1050 RelocationHolder rh = newHolder(); |
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1051 new(rh) virtual_call_Relocation(cached_value); |
| 0 | 1052 return rh; |
| 1053 } | |
| 1054 | |
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1055 virtual_call_Relocation(address cached_value) { |
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1056 _cached_value = cached_value; |
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1057 assert(cached_value != NULL, "first oop address must be specified"); |
| 0 | 1058 } |
| 1059 | |
| 1060 private: | |
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1061 address _cached_value; // location of set-value instruction |
| 0 | 1062 |
| 1063 friend class RelocIterator; | |
| 1064 virtual_call_Relocation() { } | |
| 1065 | |
| 1066 | |
| 1067 public: | |
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1068 address cached_value(); |
| 0 | 1069 |
| 1070 // data is packed as scaled offsets in "2_ints" format: [f l] or [Ff Ll] | |
| 1071 // oop_limit is set to 0 if the limit falls somewhere within the call. | |
| 1072 // When unpacking, a zero oop_limit is taken to refer to the end of the call. | |
| 1073 // (This has the effect of bringing in the call's delay slot on SPARC.) | |
| 1074 void pack_data_to(CodeSection* dest); | |
| 1075 void unpack_data(); | |
| 1076 | |
| 1077 void clear_inline_cache(); | |
| 1078 }; | |
| 1079 | |
| 1080 | |
| 1081 class opt_virtual_call_Relocation : public CallRelocation { | |
| 1082 relocInfo::relocType type() { return relocInfo::opt_virtual_call_type; } | |
| 1083 | |
| 1084 public: | |
| 1085 static RelocationHolder spec() { | |
| 1086 RelocationHolder rh = newHolder(); | |
| 1087 new(rh) opt_virtual_call_Relocation(); | |
| 1088 return rh; | |
| 1089 } | |
| 1090 | |
| 1091 private: | |
| 1092 friend class RelocIterator; | |
| 1093 opt_virtual_call_Relocation() { } | |
| 1094 | |
| 1095 public: | |
| 1096 void clear_inline_cache(); | |
| 1097 | |
| 1098 // find the matching static_stub | |
| 1099 address static_stub(); | |
| 1100 }; | |
| 1101 | |
| 1102 | |
| 1103 class static_call_Relocation : public CallRelocation { | |
| 1104 relocInfo::relocType type() { return relocInfo::static_call_type; } | |
| 1105 | |
| 1106 public: | |
| 1107 static RelocationHolder spec() { | |
| 1108 RelocationHolder rh = newHolder(); | |
| 1109 new(rh) static_call_Relocation(); | |
| 1110 return rh; | |
| 1111 } | |
| 1112 | |
| 1113 private: | |
| 1114 friend class RelocIterator; | |
| 1115 static_call_Relocation() { } | |
| 1116 | |
| 1117 public: | |
| 1118 void clear_inline_cache(); | |
| 1119 | |
| 1120 // find the matching static_stub | |
| 1121 address static_stub(); | |
| 1122 }; | |
| 1123 | |
| 1124 class static_stub_Relocation : public Relocation { | |
| 1125 relocInfo::relocType type() { return relocInfo::static_stub_type; } | |
| 1126 | |
| 1127 public: | |
| 1128 static RelocationHolder spec(address static_call) { | |
| 1129 RelocationHolder rh = newHolder(); | |
| 1130 new(rh) static_stub_Relocation(static_call); | |
| 1131 return rh; | |
| 1132 } | |
| 1133 | |
| 1134 private: | |
| 1135 address _static_call; // location of corresponding static_call | |
| 1136 | |
| 1137 static_stub_Relocation(address static_call) { | |
| 1138 _static_call = static_call; | |
| 1139 } | |
| 1140 | |
| 1141 friend class RelocIterator; | |
| 1142 static_stub_Relocation() { } | |
| 1143 | |
| 1144 public: | |
| 1145 void clear_inline_cache(); | |
| 1146 | |
| 1147 address static_call() { return _static_call; } | |
| 1148 | |
| 1149 // data is packed as a scaled offset in "1_int" format: [c] or [Cc] | |
| 1150 void pack_data_to(CodeSection* dest); | |
| 1151 void unpack_data(); | |
| 1152 }; | |
| 1153 | |
| 1154 class runtime_call_Relocation : public CallRelocation { | |
| 1155 relocInfo::relocType type() { return relocInfo::runtime_call_type; } | |
| 1156 | |
| 1157 public: | |
| 1158 static RelocationHolder spec() { | |
| 1159 RelocationHolder rh = newHolder(); | |
| 1160 new(rh) runtime_call_Relocation(); | |
| 1161 return rh; | |
| 1162 } | |
| 1163 | |
| 1164 private: | |
| 1165 friend class RelocIterator; | |
| 1166 runtime_call_Relocation() { } | |
| 1167 | |
| 1168 public: | |
| 1169 }; | |
| 1170 | |
| 1171 class external_word_Relocation : public DataRelocation { | |
| 1172 relocInfo::relocType type() { return relocInfo::external_word_type; } | |
| 1173 | |
| 1174 public: | |
| 1175 static RelocationHolder spec(address target) { | |
| 1176 assert(target != NULL, "must not be null"); | |
| 1177 RelocationHolder rh = newHolder(); | |
| 1178 new(rh) external_word_Relocation(target); | |
| 1179 return rh; | |
| 1180 } | |
| 1181 | |
| 1182 // Use this one where all 32/64 bits of the target live in the code stream. | |
| 1183 // The target must be an intptr_t, and must be absolute (not relative). | |
| 1184 static RelocationHolder spec_for_immediate() { | |
| 1185 RelocationHolder rh = newHolder(); | |
| 1186 new(rh) external_word_Relocation(NULL); | |
| 1187 return rh; | |
| 1188 } | |
| 1189 | |
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1190 // Some address looking values aren't safe to treat as relocations |
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1191 // and should just be treated as constants. |
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1192 static bool can_be_relocated(address target) { |
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1193 return target != NULL && !is_reloc_index((intptr_t)target); |
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1194 } |
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1195 |
| 0 | 1196 private: |
| 1197 address _target; // address in runtime | |
| 1198 | |
| 1199 external_word_Relocation(address target) { | |
| 1200 _target = target; | |
| 1201 } | |
| 1202 | |
| 1203 friend class RelocIterator; | |
| 1204 external_word_Relocation() { } | |
| 1205 | |
| 1206 public: | |
| 1207 // data is packed as a well-known address in "1_int" format: [a] or [Aa] | |
| 1208 // The function runtime_address_to_index is used to turn full addresses | |
| 1209 // to short indexes, if they are pre-registered by the stub mechanism. | |
| 1210 // If the "a" value is 0 (i.e., _target is NULL), the address is stored | |
| 1211 // in the code stream. See external_word_Relocation::target(). | |
| 1212 void pack_data_to(CodeSection* dest); | |
| 1213 void unpack_data(); | |
| 1214 | |
| 1215 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
| 1216 address target(); // if _target==NULL, fetch addr from code stream | |
| 1217 address value() { return target(); } | |
| 1218 }; | |
| 1219 | |
| 1220 class internal_word_Relocation : public DataRelocation { | |
| 1221 relocInfo::relocType type() { return relocInfo::internal_word_type; } | |
| 1222 | |
| 1223 public: | |
| 1224 static RelocationHolder spec(address target) { | |
| 1225 assert(target != NULL, "must not be null"); | |
| 1226 RelocationHolder rh = newHolder(); | |
| 1227 new(rh) internal_word_Relocation(target); | |
| 1228 return rh; | |
| 1229 } | |
| 1230 | |
| 1231 // use this one where all the bits of the target can fit in the code stream: | |
| 1232 static RelocationHolder spec_for_immediate() { | |
| 1233 RelocationHolder rh = newHolder(); | |
| 1234 new(rh) internal_word_Relocation(NULL); | |
| 1235 return rh; | |
| 1236 } | |
| 1237 | |
| 1238 internal_word_Relocation(address target) { | |
| 1239 _target = target; | |
| 1240 _section = -1; // self-relative | |
| 1241 } | |
| 1242 | |
| 1243 protected: | |
| 1244 address _target; // address in CodeBlob | |
| 1245 int _section; // section providing base address, if any | |
| 1246 | |
| 1247 friend class RelocIterator; | |
| 1248 internal_word_Relocation() { } | |
| 1249 | |
| 1250 // bit-width of LSB field in packed offset, if section >= 0 | |
| 1251 enum { section_width = 2 }; // must equal CodeBuffer::sect_bits | |
| 1252 | |
| 1253 public: | |
| 1254 // data is packed as a scaled offset in "1_int" format: [o] or [Oo] | |
| 1255 // If the "o" value is 0 (i.e., _target is NULL), the offset is stored | |
| 1256 // in the code stream. See internal_word_Relocation::target(). | |
| 1257 // If _section is not -1, it is appended to the low bits of the offset. | |
| 1258 void pack_data_to(CodeSection* dest); | |
| 1259 void unpack_data(); | |
| 1260 | |
| 1261 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
| 1262 address target(); // if _target==NULL, fetch addr from code stream | |
| 1263 int section() { return _section; } | |
| 1264 address value() { return target(); } | |
| 1265 }; | |
| 1266 | |
| 1267 class section_word_Relocation : public internal_word_Relocation { | |
| 1268 relocInfo::relocType type() { return relocInfo::section_word_type; } | |
| 1269 | |
| 1270 public: | |
| 1271 static RelocationHolder spec(address target, int section) { | |
| 1272 RelocationHolder rh = newHolder(); | |
| 1273 new(rh) section_word_Relocation(target, section); | |
| 1274 return rh; | |
| 1275 } | |
| 1276 | |
| 1277 section_word_Relocation(address target, int section) { | |
| 1278 assert(target != NULL, "must not be null"); | |
| 1279 assert(section >= 0, "must be a valid section"); | |
| 1280 _target = target; | |
| 1281 _section = section; | |
| 1282 } | |
| 1283 | |
| 1284 //void pack_data_to -- inherited | |
| 1285 void unpack_data(); | |
| 1286 | |
| 1287 private: | |
| 1288 friend class RelocIterator; | |
| 1289 section_word_Relocation() { } | |
| 1290 }; | |
| 1291 | |
| 1292 | |
| 1293 class poll_Relocation : public Relocation { | |
| 1294 bool is_data() { return true; } | |
| 1295 relocInfo::relocType type() { return relocInfo::poll_type; } | |
| 304 | 1296 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); |
| 0 | 1297 }; |
| 1298 | |
| 1299 class poll_return_Relocation : public Relocation { | |
| 1300 bool is_data() { return true; } | |
| 1301 relocInfo::relocType type() { return relocInfo::poll_return_type; } | |
| 304 | 1302 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); |
| 0 | 1303 }; |
| 1304 | |
| 1305 | |
| 1306 class breakpoint_Relocation : public Relocation { | |
| 1307 relocInfo::relocType type() { return relocInfo::breakpoint_type; } | |
| 1308 | |
| 1309 enum { | |
| 1310 // attributes which affect the interpretation of the data: | |
| 1311 removable_attr = 0x0010, // buffer [i...] allows for undoing the trap | |
| 1312 internal_attr = 0x0020, // the target is an internal addr (local stub) | |
| 1313 settable_attr = 0x0040, // the target is settable | |
| 1314 | |
| 1315 // states which can change over time: | |
| 1316 enabled_state = 0x0100, // breakpoint must be active in running code | |
| 1317 active_state = 0x0200, // breakpoint instruction actually in code | |
| 1318 | |
| 1319 kind_mask = 0x000F, // mask for extracting kind | |
| 1320 high_bit = 0x4000 // extra bit which is always set | |
| 1321 }; | |
| 1322 | |
| 1323 public: | |
| 1324 enum { | |
| 1325 // kinds: | |
| 1326 initialization = 1, | |
| 1327 safepoint = 2 | |
| 1328 }; | |
| 1329 | |
| 1330 // If target is NULL, 32 bits are reserved for a later set_target(). | |
| 1331 static RelocationHolder spec(int kind, address target = NULL, bool internal_target = false) { | |
| 1332 RelocationHolder rh = newHolder(); | |
| 1333 new(rh) breakpoint_Relocation(kind, target, internal_target); | |
| 1334 return rh; | |
| 1335 } | |
| 1336 | |
| 1337 private: | |
| 1338 // We require every bits value to NOT to fit into relocInfo::datalen_width, | |
| 1339 // because we are going to actually store state in the reloc, and so | |
| 1340 // cannot allow it to be compressed (and hence copied by the iterator). | |
| 1341 | |
| 1342 short _bits; // bit-encoded kind, attrs, & state | |
| 1343 address _target; | |
| 1344 | |
| 1345 breakpoint_Relocation(int kind, address target, bool internal_target); | |
| 1346 | |
| 1347 friend class RelocIterator; | |
| 1348 breakpoint_Relocation() { } | |
| 1349 | |
| 1350 short bits() const { return _bits; } | |
| 1351 short& live_bits() const { return data()[0]; } | |
| 1352 short* instrs() const { return data() + datalen() - instrlen(); } | |
| 1353 int instrlen() const { return removable() ? pd_breakpoint_size() : 0; } | |
| 1354 | |
| 1355 void set_bits(short x) { | |
| 1356 assert(live_bits() == _bits, "must be the only mutator of reloc info"); | |
| 1357 live_bits() = _bits = x; | |
| 1358 } | |
| 1359 | |
| 1360 public: | |
| 1361 address target() const; | |
| 1362 void set_target(address x); | |
| 1363 | |
| 1364 int kind() const { return bits() & kind_mask; } | |
| 1365 bool enabled() const { return (bits() & enabled_state) != 0; } | |
| 1366 bool active() const { return (bits() & active_state) != 0; } | |
| 1367 bool internal() const { return (bits() & internal_attr) != 0; } | |
| 1368 bool removable() const { return (bits() & removable_attr) != 0; } | |
| 1369 bool settable() const { return (bits() & settable_attr) != 0; } | |
| 1370 | |
| 1371 void set_enabled(bool b); // to activate, you must also say set_active | |
| 1372 void set_active(bool b); // actually inserts bpt (must be enabled 1st) | |
| 1373 | |
| 1374 // data is packed as 16 bits, followed by the target (1 or 2 words), followed | |
| 1375 // if necessary by empty storage for saving away original instruction bytes. | |
| 1376 void pack_data_to(CodeSection* dest); | |
| 1377 void unpack_data(); | |
| 1378 | |
| 1379 // during certain operations, breakpoints must be out of the way: | |
| 1380 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
| 1381 assert(!active(), "cannot perform relocation on enabled breakpoints"); | |
| 1382 } | |
| 1383 }; | |
| 1384 | |
| 1385 | |
| 1386 // We know all the xxx_Relocation classes, so now we can define these: | |
| 1387 #define EACH_CASE(name) \ | |
| 1388 inline name##_Relocation* RelocIterator::name##_reloc() { \ | |
| 1389 assert(type() == relocInfo::name##_type, "type must agree"); \ | |
| 1390 /* The purpose of the placed "new" is to re-use the same */ \ | |
| 1391 /* stack storage for each new iteration. */ \ | |
| 1392 name##_Relocation* r = new(_rh) name##_Relocation(); \ | |
| 1393 r->set_binding(this); \ | |
| 1394 r->name##_Relocation::unpack_data(); \ | |
| 1395 return r; \ | |
| 1396 } | |
| 1397 APPLY_TO_RELOCATIONS(EACH_CASE); | |
| 1398 #undef EACH_CASE | |
| 1399 | |
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1400 inline RelocIterator::RelocIterator(nmethod* nm, address begin, address limit) { |
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1401 initialize(nm, begin, limit); |
| 0 | 1402 } |
| 1403 | |
| 1404 // if you are going to patch code, you should use this subclass of | |
| 1405 // RelocIterator | |
| 1406 class PatchingRelocIterator : public RelocIterator { | |
| 1407 private: | |
| 1408 RelocIterator _init_state; | |
| 1409 | |
| 1410 void prepass(); // deactivates all breakpoints | |
| 1411 void postpass(); // reactivates all enabled breakpoints | |
| 1412 | |
| 1413 // do not copy these puppies; it would have unpredictable side effects | |
| 1414 // these are private and have no bodies defined because they should not be called | |
| 1415 PatchingRelocIterator(const RelocIterator&); | |
| 1416 void operator=(const RelocIterator&); | |
| 1417 | |
| 1418 public: | |
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1419 PatchingRelocIterator(nmethod* nm, address begin = NULL, address limit = NULL) |
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1420 : RelocIterator(nm, begin, limit) { prepass(); } |
| 0 | 1421 |
| 1422 ~PatchingRelocIterator() { postpass(); } | |
| 1423 }; | |
| 1972 | 1424 |
| 1425 #endif // SHARE_VM_CODE_RELOCINFO_HPP |