Mercurial > hg > truffle
annotate src/share/vm/code/relocInfo.hpp @ 4530:6c6cb7be1324
bugfix
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Wed, 08 Feb 2012 21:13:35 -0800 |
parents | 6c97c830fb6f |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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 | |
0 | 31 // Types in this file: |
32 // relocInfo | |
33 // One element of an array of halfwords encoding compressed relocations. | |
34 // Also, the source of relocation types (relocInfo::oop_type, ...). | |
35 // Relocation | |
36 // A flyweight object representing a single relocation. | |
37 // It is fully unpacked from the compressed relocation array. | |
38 // oop_Relocation, ... (subclasses of Relocation) | |
39 // The location of some type-specific operations (oop_addr, ...). | |
40 // Also, the source of relocation specs (oop_Relocation::spec, ...). | |
41 // RelocationHolder | |
42 // A ValueObj type which acts as a union holding a Relocation object. | |
43 // Represents a relocation spec passed into a CodeBuffer during assembly. | |
44 // RelocIterator | |
45 // A StackObj which iterates over the relocations associated with | |
46 // a range of code addresses. Can be used to operate a copy of code. | |
47 // PatchingRelocIterator | |
48 // Specialized subtype of RelocIterator which removes breakpoints | |
49 // temporarily during iteration, then restores them. | |
50 // BoundRelocation | |
51 // An _internal_ type shared by packers and unpackers of relocations. | |
52 // It pastes together a RelocationHolder with some pointers into | |
53 // code and relocInfo streams. | |
54 | |
55 | |
56 // Notes on relocType: | |
57 // | |
58 // These hold enough information to read or write a value embedded in | |
59 // the instructions of an CodeBlob. They're used to update: | |
60 // | |
61 // 1) embedded oops (isOop() == true) | |
62 // 2) inline caches (isIC() == true) | |
63 // 3) runtime calls (isRuntimeCall() == true) | |
64 // 4) internal word ref (isInternalWord() == true) | |
65 // 5) external word ref (isExternalWord() == true) | |
66 // | |
67 // when objects move (GC) or if code moves (compacting the code heap). | |
68 // They are also used to patch the code (if a call site must change) | |
69 // | |
70 // A relocInfo is represented in 16 bits: | |
71 // 4 bits indicating the relocation type | |
72 // 12 bits indicating the offset from the previous relocInfo address | |
73 // | |
74 // The offsets accumulate along the relocInfo stream to encode the | |
75 // address within the CodeBlob, which is named RelocIterator::addr(). | |
76 // The address of a particular relocInfo always points to the first | |
77 // byte of the relevant instruction (and not to any of its subfields | |
78 // or embedded immediate constants). | |
79 // | |
80 // The offset value is scaled appropriately for the target machine. | |
81 // (See relocInfo_<arch>.hpp for the offset scaling.) | |
82 // | |
83 // On some machines, there may also be a "format" field which may provide | |
84 // additional information about the format of the instruction stream | |
85 // at the corresponding code address. The format value is usually zero. | |
86 // Any machine (such as Intel) whose instructions can sometimes contain | |
87 // more than one relocatable constant needs format codes to distinguish | |
88 // which operand goes with a given relocation. | |
89 // | |
90 // If the target machine needs N format bits, the offset has 12-N bits, | |
91 // the format is encoded between the offset and the type, and the | |
92 // relocInfo_<arch>.hpp file has manifest constants for the format codes. | |
93 // | |
94 // If the type is "data_prefix_tag" then the offset bits are further encoded, | |
95 // and in fact represent not a code-stream offset but some inline data. | |
96 // The data takes the form of a counted sequence of halfwords, which | |
97 // precedes the actual relocation record. (Clients never see it directly.) | |
98 // The interpetation of this extra data depends on the relocation type. | |
99 // | |
100 // On machines that have 32-bit immediate fields, there is usually | |
101 // little need for relocation "prefix" data, because the instruction stream | |
102 // is a perfectly reasonable place to store the value. On machines in | |
103 // which 32-bit values must be "split" across instructions, the relocation | |
104 // data is the "true" specification of the value, which is then applied | |
105 // to some field of the instruction (22 or 13 bits, on SPARC). | |
106 // | |
107 // Whenever the location of the CodeBlob changes, any PC-relative | |
108 // relocations, and any internal_word_type relocations, must be reapplied. | |
109 // After the GC runs, oop_type relocations must be reapplied. | |
110 // | |
111 // | |
112 // Here are meanings of the types: | |
113 // | |
114 // relocInfo::none -- a filler record | |
115 // Value: none | |
116 // Instruction: The corresponding code address is ignored | |
117 // Data: Any data prefix and format code are ignored | |
118 // (This means that any relocInfo can be disabled by setting | |
119 // its type to none. See relocInfo::remove.) | |
120 // | |
121 // relocInfo::oop_type -- a reference to an oop | |
122 // Value: an oop, or else the address (handle) of an oop | |
123 // Instruction types: memory (load), set (load address) | |
124 // Data: [] an oop stored in 4 bytes of instruction | |
125 // [n] n is the index of an oop in the CodeBlob's oop pool | |
126 // [[N]n l] and l is a byte offset to be applied to the oop | |
127 // [Nn Ll] both index and offset may be 32 bits if necessary | |
128 // Here is a special hack, used only by the old compiler: | |
129 // [[N]n 00] the value is the __address__ of the nth oop in the pool | |
130 // (Note that the offset allows optimal references to class variables.) | |
131 // | |
132 // relocInfo::internal_word_type -- an address within the same CodeBlob | |
133 // relocInfo::section_word_type -- same, but can refer to another section | |
134 // Value: an address in the CodeBlob's code or constants section | |
135 // Instruction types: memory (load), set (load address) | |
136 // Data: [] stored in 4 bytes of instruction | |
137 // [[L]l] a relative offset (see [About Offsets] below) | |
138 // In the case of section_word_type, the offset is relative to a section | |
139 // base address, and the section number (e.g., SECT_INSTS) is encoded | |
140 // into the low two bits of the offset L. | |
141 // | |
142 // relocInfo::external_word_type -- a fixed address in the runtime system | |
143 // Value: an address | |
144 // Instruction types: memory (load), set (load address) | |
145 // Data: [] stored in 4 bytes of instruction | |
146 // [n] the index of a "well-known" stub (usual case on RISC) | |
147 // [Ll] a 32-bit address | |
148 // | |
149 // relocInfo::runtime_call_type -- a fixed subroutine in the runtime system | |
150 // Value: an address | |
151 // Instruction types: PC-relative call (or a PC-relative branch) | |
152 // Data: [] stored in 4 bytes of instruction | |
153 // | |
154 // relocInfo::static_call_type -- a static call | |
155 // Value: an CodeBlob, a stub, or a fixup routine | |
156 // Instruction types: a call | |
157 // Data: [] | |
158 // The identity of the callee is extracted from debugging information. | |
159 // //%note reloc_3 | |
160 // | |
161 // relocInfo::virtual_call_type -- a virtual call site (which includes an inline | |
162 // cache) | |
163 // Value: an CodeBlob, a stub, the interpreter, or a fixup routine | |
164 // Instruction types: a call, plus some associated set-oop instructions | |
165 // Data: [] the associated set-oops are adjacent to the call | |
166 // [n] n is a relative offset to the first set-oop | |
167 // [[N]n l] and l is a limit within which the set-oops occur | |
168 // [Nn Ll] both n and l may be 32 bits if necessary | |
169 // The identity of the callee is extracted from debugging information. | |
170 // | |
171 // relocInfo::opt_virtual_call_type -- a virtual call site that is statically bound | |
172 // | |
173 // Same info as a static_call_type. We use a special type, so the handling of | |
174 // virtuals and statics are separated. | |
175 // | |
176 // | |
177 // The offset n points to the first set-oop. (See [About Offsets] below.) | |
178 // In turn, the set-oop instruction specifies or contains an oop cell devoted | |
179 // exclusively to the IC call, which can be patched along with the call. | |
180 // | |
181 // The locations of any other set-oops are found by searching the relocation | |
182 // information starting at the first set-oop, and continuing until all | |
183 // relocations up through l have been inspected. The value l is another | |
184 // relative offset. (Both n and l are relative to the call's first byte.) | |
185 // | |
186 // The limit l of the search is exclusive. However, if it points within | |
187 // the call (e.g., offset zero), it is adjusted to point after the call and | |
188 // any associated machine-specific delay slot. | |
189 // | |
190 // Since the offsets could be as wide as 32-bits, these conventions | |
191 // put no restrictions whatever upon code reorganization. | |
192 // | |
193 // The compiler is responsible for ensuring that transition from a clean | |
194 // state to a monomorphic compiled state is MP-safe. This implies that | |
195 // the system must respond well to intermediate states where a random | |
196 // subset of the set-oops has been correctly from the clean state | |
197 // upon entry to the VEP of the compiled method. In the case of a | |
198 // machine (Intel) with a single set-oop instruction, the 32-bit | |
199 // immediate field must not straddle a unit of memory coherence. | |
200 // //%note reloc_3 | |
201 // | |
202 // relocInfo::breakpoint_type -- a conditional breakpoint in the code | |
203 // Value: none | |
204 // Instruction types: any whatsoever | |
205 // Data: [b [T]t i...] | |
206 // The b is a bit-packed word representing the breakpoint's attributes. | |
207 // The t is a target address which the breakpoint calls (when it is enabled). | |
208 // The i... is a place to store one or two instruction words overwritten | |
209 // by a trap, so that the breakpoint may be subsequently removed. | |
210 // | |
211 // relocInfo::static_stub_type -- an extra stub for each static_call_type | |
212 // Value: none | |
213 // Instruction types: a virtual call: { set_oop; jump; } | |
214 // Data: [[N]n] the offset of the associated static_call reloc | |
215 // This stub becomes the target of a static call which must be upgraded | |
216 // to a virtual call (because the callee is interpreted). | |
217 // See [About Offsets] below. | |
218 // //%note reloc_2 | |
219 // | |
220 // For example: | |
221 // | |
222 // INSTRUCTIONS RELOC: TYPE PREFIX DATA | |
223 // ------------ ---- ----------- | |
224 // sethi %hi(myObject), R oop_type [n(myObject)] | |
225 // ld [R+%lo(myObject)+fldOffset], R2 oop_type [n(myObject) fldOffset] | |
226 // add R2, 1, R2 | |
227 // st R2, [R+%lo(myObject)+fldOffset] oop_type [n(myObject) fldOffset] | |
228 //%note reloc_1 | |
229 // | |
230 // This uses 4 instruction words, 8 relocation halfwords, | |
231 // and an entry (which is sharable) in the CodeBlob's oop pool, | |
232 // for a total of 36 bytes. | |
233 // | |
234 // Note that the compiler is responsible for ensuring the "fldOffset" when | |
235 // added to "%lo(myObject)" does not overflow the immediate fields of the | |
236 // memory instructions. | |
237 // | |
238 // | |
239 // [About Offsets] Relative offsets are supplied to this module as | |
240 // positive byte offsets, but they may be internally stored scaled | |
241 // and/or negated, depending on what is most compact for the target | |
242 // system. Since the object pointed to by the offset typically | |
243 // precedes the relocation address, it is profitable to store | |
244 // these negative offsets as positive numbers, but this decision | |
245 // is internal to the relocation information abstractions. | |
246 // | |
247 | |
248 class Relocation; | |
249 class CodeBuffer; | |
250 class CodeSection; | |
251 class RelocIterator; | |
252 | |
253 class relocInfo VALUE_OBJ_CLASS_SPEC { | |
254 friend class RelocIterator; | |
255 public: | |
256 enum relocType { | |
257 none = 0, // Used when no relocation should be generated | |
258 oop_type = 1, // embedded oop | |
259 virtual_call_type = 2, // a standard inline cache call for a virtual send | |
260 opt_virtual_call_type = 3, // a virtual call that has been statically bound (i.e., no IC cache) | |
261 static_call_type = 4, // a static send | |
262 static_stub_type = 5, // stub-entry for static send (takes care of interpreter case) | |
263 runtime_call_type = 6, // call to fixed external routine | |
264 external_word_type = 7, // reference to fixed external address | |
265 internal_word_type = 8, // reference within the current code blob | |
266 section_word_type = 9, // internal, but a cross-section reference | |
267 poll_type = 10, // polling instruction for safepoints | |
268 poll_return_type = 11, // polling instruction for safepoints at return | |
269 breakpoint_type = 12, // an initialization barrier or safepoint | |
270 yet_unused_type = 13, // Still unused | |
271 yet_unused_type_2 = 14, // Still unused | |
272 data_prefix_tag = 15, // tag for a prefix (carries data arguments) | |
273 type_mask = 15 // A mask which selects only the above values | |
274 }; | |
275 | |
276 protected: | |
277 unsigned short _value; | |
278 | |
279 enum RawBitsToken { RAW_BITS }; | |
280 relocInfo(relocType type, RawBitsToken ignore, int bits) | |
281 : _value((type << nontype_width) + bits) { } | |
282 | |
283 relocInfo(relocType type, RawBitsToken ignore, int off, int f) | |
284 : _value((type << nontype_width) + (off / (unsigned)offset_unit) + (f << offset_width)) { } | |
285 | |
286 public: | |
287 // constructor | |
288 relocInfo(relocType type, int offset, int format = 0) | |
289 #ifndef ASSERT | |
290 { | |
291 (*this) = relocInfo(type, RAW_BITS, offset, format); | |
292 } | |
293 #else | |
294 // Put a bunch of assertions out-of-line. | |
295 ; | |
296 #endif | |
297 | |
298 #define APPLY_TO_RELOCATIONS(visitor) \ | |
299 visitor(oop) \ | |
300 visitor(virtual_call) \ | |
301 visitor(opt_virtual_call) \ | |
302 visitor(static_call) \ | |
303 visitor(static_stub) \ | |
304 visitor(runtime_call) \ | |
305 visitor(external_word) \ | |
306 visitor(internal_word) \ | |
307 visitor(poll) \ | |
308 visitor(poll_return) \ | |
309 visitor(breakpoint) \ | |
310 visitor(section_word) \ | |
311 | |
312 | |
313 public: | |
314 enum { | |
315 value_width = sizeof(unsigned short) * BitsPerByte, | |
316 type_width = 4, // == log2(type_mask+1) | |
317 nontype_width = value_width - type_width, | |
318 datalen_width = nontype_width-1, | |
319 datalen_tag = 1 << datalen_width, // or-ed into _value | |
320 datalen_limit = 1 << datalen_width, | |
321 datalen_mask = (1 << datalen_width)-1 | |
322 }; | |
323 | |
324 // accessors | |
325 public: | |
326 relocType type() const { return (relocType)((unsigned)_value >> nontype_width); } | |
327 int format() const { return format_mask==0? 0: format_mask & | |
328 ((unsigned)_value >> offset_width); } | |
329 int addr_offset() const { assert(!is_prefix(), "must have offset"); | |
330 return (_value & offset_mask)*offset_unit; } | |
331 | |
332 protected: | |
333 const short* data() const { assert(is_datalen(), "must have data"); | |
334 return (const short*)(this + 1); } | |
335 int datalen() const { assert(is_datalen(), "must have data"); | |
336 return (_value & datalen_mask); } | |
337 int immediate() const { assert(is_immediate(), "must have immed"); | |
338 return (_value & datalen_mask); } | |
339 public: | |
340 static int addr_unit() { return offset_unit; } | |
341 static int offset_limit() { return (1 << offset_width) * offset_unit; } | |
342 | |
343 void set_type(relocType type); | |
344 void set_format(int format); | |
345 | |
346 void remove() { set_type(none); } | |
347 | |
348 protected: | |
349 bool is_none() const { return type() == none; } | |
350 bool is_prefix() const { return type() == data_prefix_tag; } | |
351 bool is_datalen() const { assert(is_prefix(), "must be prefix"); | |
352 return (_value & datalen_tag) != 0; } | |
353 bool is_immediate() const { assert(is_prefix(), "must be prefix"); | |
354 return (_value & datalen_tag) == 0; } | |
355 | |
356 public: | |
357 // Occasionally records of type relocInfo::none will appear in the stream. | |
358 // We do not bother to filter these out, but clients should ignore them. | |
359 // These records serve as "filler" in three ways: | |
360 // - to skip large spans of unrelocated code (this is rare) | |
361 // - to pad out the relocInfo array to the required oop alignment | |
362 // - to disable old relocation information which is no longer applicable | |
363 | |
364 inline friend relocInfo filler_relocInfo(); | |
365 | |
366 // Every non-prefix relocation may be preceded by at most one prefix, | |
367 // which supplies 1 or more halfwords of associated data. Conventionally, | |
368 // an int is represented by 0, 1, or 2 halfwords, depending on how | |
369 // many bits are required to represent the value. (In addition, | |
370 // if the sole halfword is a 10-bit unsigned number, it is made | |
371 // "immediate" in the prefix header word itself. This optimization | |
372 // is invisible outside this module.) | |
373 | |
374 inline friend relocInfo prefix_relocInfo(int datalen = 0); | |
375 | |
376 protected: | |
377 // an immediate relocInfo optimizes a prefix with one 10-bit unsigned value | |
378 static relocInfo immediate_relocInfo(int data0) { | |
379 assert(fits_into_immediate(data0), "data0 in limits"); | |
380 return relocInfo(relocInfo::data_prefix_tag, RAW_BITS, data0); | |
381 } | |
382 static bool fits_into_immediate(int data0) { | |
383 return (data0 >= 0 && data0 < datalen_limit); | |
384 } | |
385 | |
386 public: | |
387 // Support routines for compilers. | |
388 | |
389 // This routine takes an infant relocInfo (unprefixed) and | |
390 // edits in its prefix, if any. It also updates dest.locs_end. | |
391 void initialize(CodeSection* dest, Relocation* reloc); | |
392 | |
393 // This routine updates a prefix and returns the limit pointer. | |
394 // It tries to compress the prefix from 32 to 16 bits, and if | |
395 // successful returns a reduced "prefix_limit" pointer. | |
396 relocInfo* finish_prefix(short* prefix_limit); | |
397 | |
398 // bit-packers for the data array: | |
399 | |
400 // As it happens, the bytes within the shorts are ordered natively, | |
401 // but the shorts within the word are ordered big-endian. | |
402 // This is an arbitrary choice, made this way mainly to ease debugging. | |
403 static int data0_from_int(jint x) { return x >> value_width; } | |
404 static int data1_from_int(jint x) { return (short)x; } | |
405 static jint jint_from_data(short* data) { | |
406 return (data[0] << value_width) + (unsigned short)data[1]; | |
407 } | |
408 | |
409 static jint short_data_at(int n, short* data, int datalen) { | |
410 return datalen > n ? data[n] : 0; | |
411 } | |
412 | |
413 static jint jint_data_at(int n, short* data, int datalen) { | |
414 return datalen > n+1 ? jint_from_data(&data[n]) : short_data_at(n, data, datalen); | |
415 } | |
416 | |
417 // Update methods for relocation information | |
418 // (since code is dynamically patched, we also need to dynamically update the relocation info) | |
419 // Both methods takes old_type, so it is able to performe sanity checks on the information removed. | |
420 static void change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type); | |
421 static void remove_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type); | |
422 | |
423 // Machine dependent stuff | |
1972 | 424 #ifdef TARGET_ARCH_x86 |
425 # include "relocInfo_x86.hpp" | |
426 #endif | |
427 #ifdef TARGET_ARCH_sparc | |
428 # include "relocInfo_sparc.hpp" | |
429 #endif | |
430 #ifdef TARGET_ARCH_zero | |
431 # include "relocInfo_zero.hpp" | |
432 #endif | |
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433 #ifdef TARGET_ARCH_arm |
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434 # include "relocInfo_arm.hpp" |
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435 #endif |
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436 #ifdef TARGET_ARCH_ppc |
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437 # include "relocInfo_ppc.hpp" |
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438 #endif |
1972 | 439 |
0 | 440 |
441 protected: | |
442 // Derived constant, based on format_width which is PD: | |
443 enum { | |
444 offset_width = nontype_width - format_width, | |
445 offset_mask = (1<<offset_width) - 1, | |
446 format_mask = (1<<format_width) - 1 | |
447 }; | |
448 public: | |
449 enum { | |
450 // Conservatively large estimate of maximum length (in shorts) | |
451 // of any relocation record (probably breakpoints are largest). | |
452 // Extended format is length prefix, data words, and tag/offset suffix. | |
453 length_limit = 1 + 1 + (3*BytesPerWord/BytesPerShort) + 1, | |
454 have_format = format_width > 0 | |
455 }; | |
456 }; | |
457 | |
458 #define FORWARD_DECLARE_EACH_CLASS(name) \ | |
459 class name##_Relocation; | |
460 APPLY_TO_RELOCATIONS(FORWARD_DECLARE_EACH_CLASS) | |
461 #undef FORWARD_DECLARE_EACH_CLASS | |
462 | |
463 | |
464 | |
465 inline relocInfo filler_relocInfo() { | |
466 return relocInfo(relocInfo::none, relocInfo::offset_limit() - relocInfo::offset_unit); | |
467 } | |
468 | |
469 inline relocInfo prefix_relocInfo(int datalen) { | |
470 assert(relocInfo::fits_into_immediate(datalen), "datalen in limits"); | |
471 return relocInfo(relocInfo::data_prefix_tag, relocInfo::RAW_BITS, relocInfo::datalen_tag | datalen); | |
472 } | |
473 | |
474 | |
475 // Holder for flyweight relocation objects. | |
476 // Although the flyweight subclasses are of varying sizes, | |
477 // the holder is "one size fits all". | |
478 class RelocationHolder VALUE_OBJ_CLASS_SPEC { | |
479 friend class Relocation; | |
480 friend class CodeSection; | |
481 | |
482 private: | |
483 // this preallocated memory must accommodate all subclasses of Relocation | |
484 // (this number is assertion-checked in Relocation::operator new) | |
485 enum { _relocbuf_size = 5 }; | |
486 void* _relocbuf[ _relocbuf_size ]; | |
487 | |
488 public: | |
489 Relocation* reloc() const { return (Relocation*) &_relocbuf[0]; } | |
490 inline relocInfo::relocType type() const; | |
491 | |
492 // Add a constant offset to a relocation. Helper for class Address. | |
493 RelocationHolder plus(int offset) const; | |
494 | |
495 inline RelocationHolder(); // initializes type to none | |
496 | |
497 inline RelocationHolder(Relocation* r); // make a copy | |
498 | |
499 static const RelocationHolder none; | |
500 }; | |
501 | |
502 // A RelocIterator iterates through the relocation information of a CodeBlob. | |
503 // It is a variable BoundRelocation which is able to take on successive | |
504 // values as it is advanced through a code stream. | |
505 // Usage: | |
506 // RelocIterator iter(nm); | |
507 // while (iter.next()) { | |
508 // iter.reloc()->some_operation(); | |
509 // } | |
510 // or: | |
511 // RelocIterator iter(nm); | |
512 // while (iter.next()) { | |
513 // switch (iter.type()) { | |
514 // case relocInfo::oop_type : | |
515 // case relocInfo::ic_type : | |
516 // case relocInfo::prim_type : | |
517 // case relocInfo::uncommon_type : | |
518 // case relocInfo::runtime_call_type : | |
519 // case relocInfo::internal_word_type: | |
520 // case relocInfo::external_word_type: | |
521 // ... | |
522 // } | |
523 // } | |
524 | |
525 class RelocIterator : public StackObj { | |
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526 enum { SECT_LIMIT = 3 }; // must be equal to CodeBuffer::SECT_LIMIT, checked in ctor |
0 | 527 friend class Relocation; |
528 friend class relocInfo; // for change_reloc_info_for_address only | |
529 typedef relocInfo::relocType relocType; | |
530 | |
531 private: | |
532 address _limit; // stop producing relocations after this _addr | |
533 relocInfo* _current; // the current relocation information | |
534 relocInfo* _end; // end marker; we're done iterating when _current == _end | |
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535 nmethod* _code; // compiled method containing _addr |
0 | 536 address _addr; // instruction to which the relocation applies |
537 short _databuf; // spare buffer for compressed data | |
538 short* _data; // pointer to the relocation's data | |
539 short _datalen; // number of halfwords in _data | |
540 char _format; // position within the instruction | |
541 | |
542 // Base addresses needed to compute targets of section_word_type relocs. | |
543 address _section_start[SECT_LIMIT]; | |
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544 address _section_end [SECT_LIMIT]; |
0 | 545 |
546 void set_has_current(bool b) { | |
547 _datalen = !b ? -1 : 0; | |
548 debug_only(_data = NULL); | |
549 } | |
550 void set_current(relocInfo& ri) { | |
551 _current = &ri; | |
552 set_has_current(true); | |
553 } | |
554 | |
555 RelocationHolder _rh; // where the current relocation is allocated | |
556 | |
557 relocInfo* current() const { assert(has_current(), "must have current"); | |
558 return _current; } | |
559 | |
560 void set_limits(address begin, address limit); | |
561 | |
562 void advance_over_prefix(); // helper method | |
563 | |
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564 void initialize_misc(); |
0 | 565 |
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566 void initialize(nmethod* nm, address begin, address limit); |
0 | 567 |
568 friend class PatchingRelocIterator; | |
569 // make an uninitialized one, for PatchingRelocIterator: | |
570 RelocIterator() { initialize_misc(); } | |
571 | |
572 public: | |
573 // constructor | |
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574 RelocIterator(nmethod* nm, address begin = NULL, address limit = NULL); |
0 | 575 RelocIterator(CodeSection* cb, address begin = NULL, address limit = NULL); |
576 | |
577 // get next reloc info, return !eos | |
578 bool next() { | |
579 _current++; | |
580 assert(_current <= _end, "must not overrun relocInfo"); | |
581 if (_current == _end) { | |
582 set_has_current(false); | |
583 return false; | |
584 } | |
585 set_has_current(true); | |
586 | |
587 if (_current->is_prefix()) { | |
588 advance_over_prefix(); | |
589 assert(!current()->is_prefix(), "only one prefix at a time"); | |
590 } | |
591 | |
592 _addr += _current->addr_offset(); | |
593 | |
594 if (_limit != NULL && _addr >= _limit) { | |
595 set_has_current(false); | |
596 return false; | |
597 } | |
598 | |
599 if (relocInfo::have_format) _format = current()->format(); | |
600 return true; | |
601 } | |
602 | |
603 // accessors | |
604 address limit() const { return _limit; } | |
605 void set_limit(address x); | |
606 relocType type() const { return current()->type(); } | |
607 int format() const { return (relocInfo::have_format) ? current()->format() : 0; } | |
608 address addr() const { return _addr; } | |
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609 nmethod* code() const { return _code; } |
0 | 610 short* data() const { return _data; } |
611 int datalen() const { return _datalen; } | |
612 bool has_current() const { return _datalen >= 0; } | |
613 | |
614 void set_addr(address addr) { _addr = addr; } | |
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615 bool addr_in_const() const; |
0 | 616 |
617 address section_start(int n) const { | |
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618 assert(_section_start[n], "must be initialized"); |
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619 return _section_start[n]; |
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620 } |
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621 address section_end(int n) const { |
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622 assert(_section_end[n], "must be initialized"); |
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623 return _section_end[n]; |
0 | 624 } |
625 | |
626 // The address points to the affected displacement part of the instruction. | |
627 // For RISC, this is just the whole instruction. | |
628 // For Intel, this is an unaligned 32-bit word. | |
629 | |
630 // type-specific relocation accessors: oop_Relocation* oop_reloc(), etc. | |
631 #define EACH_TYPE(name) \ | |
632 inline name##_Relocation* name##_reloc(); | |
633 APPLY_TO_RELOCATIONS(EACH_TYPE) | |
634 #undef EACH_TYPE | |
635 // generic relocation accessor; switches on type to call the above | |
636 Relocation* reloc(); | |
637 | |
638 // CodeBlob's have relocation indexes for faster random access: | |
639 static int locs_and_index_size(int code_size, int locs_size); | |
640 // Store an index into [dest_start+dest_count..dest_end). | |
641 // At dest_start[0..dest_count] is the actual relocation information. | |
642 // Everything else up to dest_end is free space for the index. | |
643 static void create_index(relocInfo* dest_begin, int dest_count, relocInfo* dest_end); | |
644 | |
645 #ifndef PRODUCT | |
646 public: | |
647 void print(); | |
648 void print_current(); | |
649 #endif | |
650 }; | |
651 | |
652 | |
653 // A Relocation is a flyweight object allocated within a RelocationHolder. | |
654 // It represents the relocation data of relocation record. | |
655 // So, the RelocIterator unpacks relocInfos into Relocations. | |
656 | |
657 class Relocation VALUE_OBJ_CLASS_SPEC { | |
658 friend class RelocationHolder; | |
659 friend class RelocIterator; | |
660 | |
661 private: | |
662 static void guarantee_size(); | |
663 | |
664 // When a relocation has been created by a RelocIterator, | |
665 // this field is non-null. It allows the relocation to know | |
666 // its context, such as the address to which it applies. | |
667 RelocIterator* _binding; | |
668 | |
669 protected: | |
670 RelocIterator* binding() const { | |
671 assert(_binding != NULL, "must be bound"); | |
672 return _binding; | |
673 } | |
674 void set_binding(RelocIterator* b) { | |
675 assert(_binding == NULL, "must be unbound"); | |
676 _binding = b; | |
677 assert(_binding != NULL, "must now be bound"); | |
678 } | |
679 | |
680 Relocation() { | |
681 _binding = NULL; | |
682 } | |
683 | |
684 static RelocationHolder newHolder() { | |
685 return RelocationHolder(); | |
686 } | |
687 | |
688 public: | |
689 void* operator new(size_t size, const RelocationHolder& holder) { | |
690 if (size > sizeof(holder._relocbuf)) guarantee_size(); | |
691 assert((void* const *)holder.reloc() == &holder._relocbuf[0], "ptrs must agree"); | |
692 return holder.reloc(); | |
693 } | |
694 | |
695 // make a generic relocation for a given type (if possible) | |
696 static RelocationHolder spec_simple(relocInfo::relocType rtype); | |
697 | |
698 // here is the type-specific hook which writes relocation data: | |
699 virtual void pack_data_to(CodeSection* dest) { } | |
700 | |
701 // here is the type-specific hook which reads (unpacks) relocation data: | |
702 virtual void unpack_data() { | |
703 assert(datalen()==0 || type()==relocInfo::none, "no data here"); | |
704 } | |
705 | |
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706 static bool is_reloc_index(intptr_t index) { |
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707 return 0 < index && index < os::vm_page_size(); |
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708 } |
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709 |
0 | 710 protected: |
711 // Helper functions for pack_data_to() and unpack_data(). | |
712 | |
713 // Most of the compression logic is confined here. | |
714 // (The "immediate data" mechanism of relocInfo works independently | |
715 // of this stuff, and acts to further compress most 1-word data prefixes.) | |
716 | |
717 // A variable-width int is encoded as a short if it will fit in 16 bits. | |
718 // The decoder looks at datalen to decide whether to unpack short or jint. | |
719 // Most relocation records are quite simple, containing at most two ints. | |
720 | |
721 static bool is_short(jint x) { return x == (short)x; } | |
722 static short* add_short(short* p, int x) { *p++ = x; return p; } | |
723 static short* add_jint (short* p, jint x) { | |
724 *p++ = relocInfo::data0_from_int(x); *p++ = relocInfo::data1_from_int(x); | |
725 return p; | |
726 } | |
727 static short* add_var_int(short* p, jint x) { // add a variable-width int | |
728 if (is_short(x)) p = add_short(p, x); | |
729 else p = add_jint (p, x); | |
730 return p; | |
731 } | |
732 | |
733 static short* pack_1_int_to(short* p, jint x0) { | |
734 // Format is one of: [] [x] [Xx] | |
735 if (x0 != 0) p = add_var_int(p, x0); | |
736 return p; | |
737 } | |
738 int unpack_1_int() { | |
739 assert(datalen() <= 2, "too much data"); | |
740 return relocInfo::jint_data_at(0, data(), datalen()); | |
741 } | |
742 | |
743 // With two ints, the short form is used only if both ints are short. | |
744 short* pack_2_ints_to(short* p, jint x0, jint x1) { | |
745 // Format is one of: [] [x y?] [Xx Y?y] | |
746 if (x0 == 0 && x1 == 0) { | |
747 // no halfwords needed to store zeroes | |
748 } else if (is_short(x0) && is_short(x1)) { | |
749 // 1-2 halfwords needed to store shorts | |
750 p = add_short(p, x0); if (x1!=0) p = add_short(p, x1); | |
751 } else { | |
752 // 3-4 halfwords needed to store jints | |
753 p = add_jint(p, x0); p = add_var_int(p, x1); | |
754 } | |
755 return p; | |
756 } | |
757 void unpack_2_ints(jint& x0, jint& x1) { | |
758 int dlen = datalen(); | |
759 short* dp = data(); | |
760 if (dlen <= 2) { | |
761 x0 = relocInfo::short_data_at(0, dp, dlen); | |
762 x1 = relocInfo::short_data_at(1, dp, dlen); | |
763 } else { | |
764 assert(dlen <= 4, "too much data"); | |
765 x0 = relocInfo::jint_data_at(0, dp, dlen); | |
766 x1 = relocInfo::jint_data_at(2, dp, dlen); | |
767 } | |
768 } | |
769 | |
770 protected: | |
771 // platform-dependent utilities for decoding and patching instructions | |
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772 void pd_set_data_value (address x, intptr_t off, bool verify_only = false); // a set or mem-ref |
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773 void pd_verify_data_value (address x, intptr_t off) { pd_set_data_value(x, off, true); } |
0 | 774 address pd_call_destination (address orig_addr = NULL); |
775 void pd_set_call_destination (address x); | |
776 void pd_swap_in_breakpoint (address x, short* instrs, int instrlen); | |
777 void pd_swap_out_breakpoint (address x, short* instrs, int instrlen); | |
778 static int pd_breakpoint_size (); | |
779 | |
780 // this extracts the address of an address in the code stream instead of the reloc data | |
781 address* pd_address_in_code (); | |
782 | |
783 // this extracts an address from the code stream instead of the reloc data | |
784 address pd_get_address_from_code (); | |
785 | |
786 // these convert from byte offsets, to scaled offsets, to addresses | |
787 static jint scaled_offset(address x, address base) { | |
788 int byte_offset = x - base; | |
789 int offset = -byte_offset / relocInfo::addr_unit(); | |
790 assert(address_from_scaled_offset(offset, base) == x, "just checkin'"); | |
791 return offset; | |
792 } | |
793 static jint scaled_offset_null_special(address x, address base) { | |
794 // Some relocations treat offset=0 as meaning NULL. | |
795 // Handle this extra convention carefully. | |
796 if (x == NULL) return 0; | |
797 assert(x != base, "offset must not be zero"); | |
798 return scaled_offset(x, base); | |
799 } | |
800 static address address_from_scaled_offset(jint offset, address base) { | |
801 int byte_offset = -( offset * relocInfo::addr_unit() ); | |
802 return base + byte_offset; | |
803 } | |
804 | |
805 // these convert between indexes and addresses in the runtime system | |
806 static int32_t runtime_address_to_index(address runtime_address); | |
807 static address index_to_runtime_address(int32_t index); | |
808 | |
809 // helpers for mapping between old and new addresses after a move or resize | |
810 address old_addr_for(address newa, const CodeBuffer* src, CodeBuffer* dest); | |
811 address new_addr_for(address olda, const CodeBuffer* src, CodeBuffer* dest); | |
812 void normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections = false); | |
813 | |
814 public: | |
815 // accessors which only make sense for a bound Relocation | |
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816 address addr() const { return binding()->addr(); } |
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817 nmethod* code() const { return binding()->code(); } |
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818 bool addr_in_const() const { return binding()->addr_in_const(); } |
0 | 819 protected: |
820 short* data() const { return binding()->data(); } | |
821 int datalen() const { return binding()->datalen(); } | |
822 int format() const { return binding()->format(); } | |
823 | |
824 public: | |
825 virtual relocInfo::relocType type() { return relocInfo::none; } | |
826 | |
827 // is it a call instruction? | |
828 virtual bool is_call() { return false; } | |
829 | |
830 // is it a data movement instruction? | |
831 virtual bool is_data() { return false; } | |
832 | |
833 // some relocations can compute their own values | |
834 virtual address value(); | |
835 | |
836 // all relocations are able to reassert their values | |
837 virtual void set_value(address x); | |
838 | |
839 virtual void clear_inline_cache() { } | |
840 | |
841 // This method assumes that all virtual/static (inline) caches are cleared (since for static_call_type and | |
842 // ic_call_type is not always posisition dependent (depending on the state of the cache)). However, this is | |
843 // probably a reasonable assumption, since empty caches simplifies code reloacation. | |
844 virtual void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { } | |
845 | |
846 void print(); | |
847 }; | |
848 | |
849 | |
850 // certain inlines must be deferred until class Relocation is defined: | |
851 | |
852 inline RelocationHolder::RelocationHolder() { | |
853 // initialize the vtbl, just to keep things type-safe | |
854 new(*this) Relocation(); | |
855 } | |
856 | |
857 | |
858 inline RelocationHolder::RelocationHolder(Relocation* r) { | |
859 // wordwise copy from r (ok if it copies garbage after r) | |
860 for (int i = 0; i < _relocbuf_size; i++) { | |
861 _relocbuf[i] = ((void**)r)[i]; | |
862 } | |
863 } | |
864 | |
865 | |
866 relocInfo::relocType RelocationHolder::type() const { | |
867 return reloc()->type(); | |
868 } | |
869 | |
870 // A DataRelocation always points at a memory or load-constant instruction.. | |
871 // It is absolute on most machines, and the constant is split on RISCs. | |
872 // The specific subtypes are oop, external_word, and internal_word. | |
873 // By convention, the "value" does not include a separately reckoned "offset". | |
874 class DataRelocation : public Relocation { | |
875 public: | |
876 bool is_data() { return true; } | |
877 | |
878 // both target and offset must be computed somehow from relocation data | |
879 virtual int offset() { return 0; } | |
880 address value() = 0; | |
881 void set_value(address x) { set_value(x, offset()); } | |
882 void set_value(address x, intptr_t o) { | |
883 if (addr_in_const()) | |
884 *(address*)addr() = x; | |
885 else | |
886 pd_set_data_value(x, o); | |
887 } | |
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888 void verify_value(address x) { |
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889 if (addr_in_const()) |
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890 assert(*(address*)addr() == x, "must agree"); |
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891 else |
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892 pd_verify_data_value(x, offset()); |
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893 } |
0 | 894 |
895 // The "o" (displacement) argument is relevant only to split relocations | |
896 // on RISC machines. In some CPUs (SPARC), the set-hi and set-lo ins'ns | |
897 // can encode more than 32 bits between them. This allows compilers to | |
898 // share set-hi instructions between addresses that differ by a small | |
899 // offset (e.g., different static variables in the same class). | |
900 // On such machines, the "x" argument to set_value on all set-lo | |
901 // instructions must be the same as the "x" argument for the | |
902 // corresponding set-hi instructions. The "o" arguments for the | |
903 // set-hi instructions are ignored, and must not affect the high-half | |
904 // immediate constant. The "o" arguments for the set-lo instructions are | |
905 // added into the low-half immediate constant, and must not overflow it. | |
906 }; | |
907 | |
908 // A CallRelocation always points at a call instruction. | |
909 // It is PC-relative on most machines. | |
910 class CallRelocation : public Relocation { | |
911 public: | |
912 bool is_call() { return true; } | |
913 | |
914 address destination() { return pd_call_destination(); } | |
915 void set_destination(address x); // pd_set_call_destination | |
916 | |
917 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
918 address value() { return destination(); } | |
919 void set_value(address x) { set_destination(x); } | |
920 }; | |
921 | |
922 class oop_Relocation : public DataRelocation { | |
923 relocInfo::relocType type() { return relocInfo::oop_type; } | |
924 | |
925 public: | |
926 // encode in one of these formats: [] [n] [n l] [Nn l] [Nn Ll] | |
927 // an oop in the CodeBlob's oop pool | |
928 static RelocationHolder spec(int oop_index, int offset = 0) { | |
929 assert(oop_index > 0, "must be a pool-resident oop"); | |
930 RelocationHolder rh = newHolder(); | |
931 new(rh) oop_Relocation(oop_index, offset); | |
932 return rh; | |
933 } | |
934 // an oop in the instruction stream | |
935 static RelocationHolder spec_for_immediate() { | |
936 const int oop_index = 0; | |
937 const int offset = 0; // if you want an offset, use the oop pool | |
938 RelocationHolder rh = newHolder(); | |
939 new(rh) oop_Relocation(oop_index, offset); | |
940 return rh; | |
941 } | |
942 | |
943 private: | |
944 jint _oop_index; // if > 0, index into CodeBlob::oop_at | |
945 jint _offset; // byte offset to apply to the oop itself | |
946 | |
947 oop_Relocation(int oop_index, int offset) { | |
948 _oop_index = oop_index; _offset = offset; | |
949 } | |
950 | |
951 friend class RelocIterator; | |
952 oop_Relocation() { } | |
953 | |
954 public: | |
955 int oop_index() { return _oop_index; } | |
956 int offset() { return _offset; } | |
957 | |
958 // data is packed in "2_ints" format: [i o] or [Ii Oo] | |
959 void pack_data_to(CodeSection* dest); | |
960 void unpack_data(); | |
961 | |
962 void fix_oop_relocation(); // reasserts oop value | |
963 | |
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964 void verify_oop_relocation(); |
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965 |
0 | 966 address value() { return (address) *oop_addr(); } |
967 | |
968 bool oop_is_immediate() { return oop_index() == 0; } | |
969 | |
970 oop* oop_addr(); // addr or &pool[jint_data] | |
971 oop oop_value(); // *oop_addr | |
972 // Note: oop_value transparently converts Universe::non_oop_word to NULL. | |
973 }; | |
974 | |
975 class virtual_call_Relocation : public CallRelocation { | |
976 relocInfo::relocType type() { return relocInfo::virtual_call_type; } | |
977 | |
978 public: | |
979 // "first_oop" points to the first associated set-oop. | |
980 // The oop_limit helps find the last associated set-oop. | |
981 // (See comments at the top of this file.) | |
982 static RelocationHolder spec(address first_oop, address oop_limit = NULL) { | |
983 RelocationHolder rh = newHolder(); | |
984 new(rh) virtual_call_Relocation(first_oop, oop_limit); | |
985 return rh; | |
986 } | |
987 | |
988 virtual_call_Relocation(address first_oop, address oop_limit) { | |
989 _first_oop = first_oop; _oop_limit = oop_limit; | |
990 assert(first_oop != NULL, "first oop address must be specified"); | |
991 } | |
992 | |
993 private: | |
994 address _first_oop; // location of first set-oop instruction | |
995 address _oop_limit; // search limit for set-oop instructions | |
996 | |
997 friend class RelocIterator; | |
998 virtual_call_Relocation() { } | |
999 | |
1000 | |
1001 public: | |
1002 address first_oop(); | |
1003 address oop_limit(); | |
1004 | |
1005 // data is packed as scaled offsets in "2_ints" format: [f l] or [Ff Ll] | |
1006 // oop_limit is set to 0 if the limit falls somewhere within the call. | |
1007 // When unpacking, a zero oop_limit is taken to refer to the end of the call. | |
1008 // (This has the effect of bringing in the call's delay slot on SPARC.) | |
1009 void pack_data_to(CodeSection* dest); | |
1010 void unpack_data(); | |
1011 | |
1012 void clear_inline_cache(); | |
1013 | |
1014 // Figure out where an ic_call is hiding, given a set-oop or call. | |
1015 // Either ic_call or first_oop must be non-null; the other is deduced. | |
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1016 // Code if non-NULL must be the nmethod, else it is deduced. |
0 | 1017 // The address of the patchable oop is also deduced. |
1018 // The returned iterator will enumerate over the oops and the ic_call, | |
1019 // as well as any other relocations that happen to be in that span of code. | |
1020 // Recognize relevant set_oops with: oop_reloc()->oop_addr() == oop_addr. | |
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1021 static RelocIterator parse_ic(nmethod* &nm, address &ic_call, address &first_oop, oop* &oop_addr, bool *is_optimized); |
0 | 1022 }; |
1023 | |
1024 | |
1025 class opt_virtual_call_Relocation : public CallRelocation { | |
1026 relocInfo::relocType type() { return relocInfo::opt_virtual_call_type; } | |
1027 | |
1028 public: | |
1029 static RelocationHolder spec() { | |
1030 RelocationHolder rh = newHolder(); | |
1031 new(rh) opt_virtual_call_Relocation(); | |
1032 return rh; | |
1033 } | |
1034 | |
1035 private: | |
1036 friend class RelocIterator; | |
1037 opt_virtual_call_Relocation() { } | |
1038 | |
1039 public: | |
1040 void clear_inline_cache(); | |
1041 | |
1042 // find the matching static_stub | |
1043 address static_stub(); | |
1044 }; | |
1045 | |
1046 | |
1047 class static_call_Relocation : public CallRelocation { | |
1048 relocInfo::relocType type() { return relocInfo::static_call_type; } | |
1049 | |
1050 public: | |
1051 static RelocationHolder spec() { | |
1052 RelocationHolder rh = newHolder(); | |
1053 new(rh) static_call_Relocation(); | |
1054 return rh; | |
1055 } | |
1056 | |
1057 private: | |
1058 friend class RelocIterator; | |
1059 static_call_Relocation() { } | |
1060 | |
1061 public: | |
1062 void clear_inline_cache(); | |
1063 | |
1064 // find the matching static_stub | |
1065 address static_stub(); | |
1066 }; | |
1067 | |
1068 class static_stub_Relocation : public Relocation { | |
1069 relocInfo::relocType type() { return relocInfo::static_stub_type; } | |
1070 | |
1071 public: | |
1072 static RelocationHolder spec(address static_call) { | |
1073 RelocationHolder rh = newHolder(); | |
1074 new(rh) static_stub_Relocation(static_call); | |
1075 return rh; | |
1076 } | |
1077 | |
1078 private: | |
1079 address _static_call; // location of corresponding static_call | |
1080 | |
1081 static_stub_Relocation(address static_call) { | |
1082 _static_call = static_call; | |
1083 } | |
1084 | |
1085 friend class RelocIterator; | |
1086 static_stub_Relocation() { } | |
1087 | |
1088 public: | |
1089 void clear_inline_cache(); | |
1090 | |
1091 address static_call() { return _static_call; } | |
1092 | |
1093 // data is packed as a scaled offset in "1_int" format: [c] or [Cc] | |
1094 void pack_data_to(CodeSection* dest); | |
1095 void unpack_data(); | |
1096 }; | |
1097 | |
1098 class runtime_call_Relocation : public CallRelocation { | |
1099 relocInfo::relocType type() { return relocInfo::runtime_call_type; } | |
1100 | |
1101 public: | |
1102 static RelocationHolder spec() { | |
1103 RelocationHolder rh = newHolder(); | |
1104 new(rh) runtime_call_Relocation(); | |
1105 return rh; | |
1106 } | |
1107 | |
1108 private: | |
1109 friend class RelocIterator; | |
1110 runtime_call_Relocation() { } | |
1111 | |
1112 public: | |
1113 }; | |
1114 | |
1115 class external_word_Relocation : public DataRelocation { | |
1116 relocInfo::relocType type() { return relocInfo::external_word_type; } | |
1117 | |
1118 public: | |
1119 static RelocationHolder spec(address target) { | |
1120 assert(target != NULL, "must not be null"); | |
1121 RelocationHolder rh = newHolder(); | |
1122 new(rh) external_word_Relocation(target); | |
1123 return rh; | |
1124 } | |
1125 | |
1126 // Use this one where all 32/64 bits of the target live in the code stream. | |
1127 // The target must be an intptr_t, and must be absolute (not relative). | |
1128 static RelocationHolder spec_for_immediate() { | |
1129 RelocationHolder rh = newHolder(); | |
1130 new(rh) external_word_Relocation(NULL); | |
1131 return rh; | |
1132 } | |
1133 | |
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1134 // Some address looking values aren't safe to treat as relocations |
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1135 // and should just be treated as constants. |
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1136 static bool can_be_relocated(address target) { |
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1137 return target != NULL && !is_reloc_index((intptr_t)target); |
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1138 } |
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1139 |
0 | 1140 private: |
1141 address _target; // address in runtime | |
1142 | |
1143 external_word_Relocation(address target) { | |
1144 _target = target; | |
1145 } | |
1146 | |
1147 friend class RelocIterator; | |
1148 external_word_Relocation() { } | |
1149 | |
1150 public: | |
1151 // data is packed as a well-known address in "1_int" format: [a] or [Aa] | |
1152 // The function runtime_address_to_index is used to turn full addresses | |
1153 // to short indexes, if they are pre-registered by the stub mechanism. | |
1154 // If the "a" value is 0 (i.e., _target is NULL), the address is stored | |
1155 // in the code stream. See external_word_Relocation::target(). | |
1156 void pack_data_to(CodeSection* dest); | |
1157 void unpack_data(); | |
1158 | |
1159 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
1160 address target(); // if _target==NULL, fetch addr from code stream | |
1161 address value() { return target(); } | |
1162 }; | |
1163 | |
1164 class internal_word_Relocation : public DataRelocation { | |
1165 relocInfo::relocType type() { return relocInfo::internal_word_type; } | |
1166 | |
1167 public: | |
1168 static RelocationHolder spec(address target) { | |
1169 assert(target != NULL, "must not be null"); | |
1170 RelocationHolder rh = newHolder(); | |
1171 new(rh) internal_word_Relocation(target); | |
1172 return rh; | |
1173 } | |
1174 | |
1175 // use this one where all the bits of the target can fit in the code stream: | |
1176 static RelocationHolder spec_for_immediate() { | |
1177 RelocationHolder rh = newHolder(); | |
1178 new(rh) internal_word_Relocation(NULL); | |
1179 return rh; | |
1180 } | |
1181 | |
1182 internal_word_Relocation(address target) { | |
1183 _target = target; | |
1184 _section = -1; // self-relative | |
1185 } | |
1186 | |
1187 protected: | |
1188 address _target; // address in CodeBlob | |
1189 int _section; // section providing base address, if any | |
1190 | |
1191 friend class RelocIterator; | |
1192 internal_word_Relocation() { } | |
1193 | |
1194 // bit-width of LSB field in packed offset, if section >= 0 | |
1195 enum { section_width = 2 }; // must equal CodeBuffer::sect_bits | |
1196 | |
1197 public: | |
1198 // data is packed as a scaled offset in "1_int" format: [o] or [Oo] | |
1199 // If the "o" value is 0 (i.e., _target is NULL), the offset is stored | |
1200 // in the code stream. See internal_word_Relocation::target(). | |
1201 // If _section is not -1, it is appended to the low bits of the offset. | |
1202 void pack_data_to(CodeSection* dest); | |
1203 void unpack_data(); | |
1204 | |
1205 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
1206 address target(); // if _target==NULL, fetch addr from code stream | |
1207 int section() { return _section; } | |
1208 address value() { return target(); } | |
1209 }; | |
1210 | |
1211 class section_word_Relocation : public internal_word_Relocation { | |
1212 relocInfo::relocType type() { return relocInfo::section_word_type; } | |
1213 | |
1214 public: | |
1215 static RelocationHolder spec(address target, int section) { | |
1216 RelocationHolder rh = newHolder(); | |
1217 new(rh) section_word_Relocation(target, section); | |
1218 return rh; | |
1219 } | |
1220 | |
1221 section_word_Relocation(address target, int section) { | |
1222 assert(target != NULL, "must not be null"); | |
1223 assert(section >= 0, "must be a valid section"); | |
1224 _target = target; | |
1225 _section = section; | |
1226 } | |
1227 | |
1228 //void pack_data_to -- inherited | |
1229 void unpack_data(); | |
1230 | |
1231 private: | |
1232 friend class RelocIterator; | |
1233 section_word_Relocation() { } | |
1234 }; | |
1235 | |
1236 | |
1237 class poll_Relocation : public Relocation { | |
1238 bool is_data() { return true; } | |
1239 relocInfo::relocType type() { return relocInfo::poll_type; } | |
304 | 1240 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); |
0 | 1241 }; |
1242 | |
1243 class poll_return_Relocation : public Relocation { | |
1244 bool is_data() { return true; } | |
1245 relocInfo::relocType type() { return relocInfo::poll_return_type; } | |
304 | 1246 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); |
0 | 1247 }; |
1248 | |
1249 | |
1250 class breakpoint_Relocation : public Relocation { | |
1251 relocInfo::relocType type() { return relocInfo::breakpoint_type; } | |
1252 | |
1253 enum { | |
1254 // attributes which affect the interpretation of the data: | |
1255 removable_attr = 0x0010, // buffer [i...] allows for undoing the trap | |
1256 internal_attr = 0x0020, // the target is an internal addr (local stub) | |
1257 settable_attr = 0x0040, // the target is settable | |
1258 | |
1259 // states which can change over time: | |
1260 enabled_state = 0x0100, // breakpoint must be active in running code | |
1261 active_state = 0x0200, // breakpoint instruction actually in code | |
1262 | |
1263 kind_mask = 0x000F, // mask for extracting kind | |
1264 high_bit = 0x4000 // extra bit which is always set | |
1265 }; | |
1266 | |
1267 public: | |
1268 enum { | |
1269 // kinds: | |
1270 initialization = 1, | |
1271 safepoint = 2 | |
1272 }; | |
1273 | |
1274 // If target is NULL, 32 bits are reserved for a later set_target(). | |
1275 static RelocationHolder spec(int kind, address target = NULL, bool internal_target = false) { | |
1276 RelocationHolder rh = newHolder(); | |
1277 new(rh) breakpoint_Relocation(kind, target, internal_target); | |
1278 return rh; | |
1279 } | |
1280 | |
1281 private: | |
1282 // We require every bits value to NOT to fit into relocInfo::datalen_width, | |
1283 // because we are going to actually store state in the reloc, and so | |
1284 // cannot allow it to be compressed (and hence copied by the iterator). | |
1285 | |
1286 short _bits; // bit-encoded kind, attrs, & state | |
1287 address _target; | |
1288 | |
1289 breakpoint_Relocation(int kind, address target, bool internal_target); | |
1290 | |
1291 friend class RelocIterator; | |
1292 breakpoint_Relocation() { } | |
1293 | |
1294 short bits() const { return _bits; } | |
1295 short& live_bits() const { return data()[0]; } | |
1296 short* instrs() const { return data() + datalen() - instrlen(); } | |
1297 int instrlen() const { return removable() ? pd_breakpoint_size() : 0; } | |
1298 | |
1299 void set_bits(short x) { | |
1300 assert(live_bits() == _bits, "must be the only mutator of reloc info"); | |
1301 live_bits() = _bits = x; | |
1302 } | |
1303 | |
1304 public: | |
1305 address target() const; | |
1306 void set_target(address x); | |
1307 | |
1308 int kind() const { return bits() & kind_mask; } | |
1309 bool enabled() const { return (bits() & enabled_state) != 0; } | |
1310 bool active() const { return (bits() & active_state) != 0; } | |
1311 bool internal() const { return (bits() & internal_attr) != 0; } | |
1312 bool removable() const { return (bits() & removable_attr) != 0; } | |
1313 bool settable() const { return (bits() & settable_attr) != 0; } | |
1314 | |
1315 void set_enabled(bool b); // to activate, you must also say set_active | |
1316 void set_active(bool b); // actually inserts bpt (must be enabled 1st) | |
1317 | |
1318 // data is packed as 16 bits, followed by the target (1 or 2 words), followed | |
1319 // if necessary by empty storage for saving away original instruction bytes. | |
1320 void pack_data_to(CodeSection* dest); | |
1321 void unpack_data(); | |
1322 | |
1323 // during certain operations, breakpoints must be out of the way: | |
1324 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { | |
1325 assert(!active(), "cannot perform relocation on enabled breakpoints"); | |
1326 } | |
1327 }; | |
1328 | |
1329 | |
1330 // We know all the xxx_Relocation classes, so now we can define these: | |
1331 #define EACH_CASE(name) \ | |
1332 inline name##_Relocation* RelocIterator::name##_reloc() { \ | |
1333 assert(type() == relocInfo::name##_type, "type must agree"); \ | |
1334 /* The purpose of the placed "new" is to re-use the same */ \ | |
1335 /* stack storage for each new iteration. */ \ | |
1336 name##_Relocation* r = new(_rh) name##_Relocation(); \ | |
1337 r->set_binding(this); \ | |
1338 r->name##_Relocation::unpack_data(); \ | |
1339 return r; \ | |
1340 } | |
1341 APPLY_TO_RELOCATIONS(EACH_CASE); | |
1342 #undef EACH_CASE | |
1343 | |
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1344 inline RelocIterator::RelocIterator(nmethod* nm, address begin, address limit) { |
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1345 initialize(nm, begin, limit); |
0 | 1346 } |
1347 | |
1348 // if you are going to patch code, you should use this subclass of | |
1349 // RelocIterator | |
1350 class PatchingRelocIterator : public RelocIterator { | |
1351 private: | |
1352 RelocIterator _init_state; | |
1353 | |
1354 void prepass(); // deactivates all breakpoints | |
1355 void postpass(); // reactivates all enabled breakpoints | |
1356 | |
1357 // do not copy these puppies; it would have unpredictable side effects | |
1358 // these are private and have no bodies defined because they should not be called | |
1359 PatchingRelocIterator(const RelocIterator&); | |
1360 void operator=(const RelocIterator&); | |
1361 | |
1362 public: | |
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1363 PatchingRelocIterator(nmethod* nm, address begin = NULL, address limit = NULL) |
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1364 : RelocIterator(nm, begin, limit) { prepass(); } |
0 | 1365 |
1366 ~PatchingRelocIterator() { postpass(); } | |
1367 }; | |
1972 | 1368 |
1369 #endif // SHARE_VM_CODE_RELOCINFO_HPP |