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annotate src/share/vm/code/relocInfo.hpp @ 14521:29ccc4cbabca
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author | Gilles Duboscq <duboscq@ssw.jku.at> |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 // BoundRelocation | |
53 // An _internal_ type shared by packers and unpackers of relocations. | |
54 // It pastes together a RelocationHolder with some pointers into | |
55 // code and relocInfo streams. | |
56 | |
57 | |
58 // Notes on relocType: | |
59 // | |
60 // These hold enough information to read or write a value embedded in | |
61 // the instructions of an CodeBlob. They're used to update: | |
62 // | |
63 // 1) embedded oops (isOop() == true) | |
64 // 2) inline caches (isIC() == true) | |
65 // 3) runtime calls (isRuntimeCall() == true) | |
66 // 4) internal word ref (isInternalWord() == true) | |
67 // 5) external word ref (isExternalWord() == true) | |
68 // | |
69 // when objects move (GC) or if code moves (compacting the code heap). | |
70 // They are also used to patch the code (if a call site must change) | |
71 // | |
72 // A relocInfo is represented in 16 bits: | |
73 // 4 bits indicating the relocation type | |
74 // 12 bits indicating the offset from the previous relocInfo address | |
75 // | |
76 // The offsets accumulate along the relocInfo stream to encode the | |
77 // address within the CodeBlob, which is named RelocIterator::addr(). | |
78 // The address of a particular relocInfo always points to the first | |
79 // byte of the relevant instruction (and not to any of its subfields | |
80 // or embedded immediate constants). | |
81 // | |
82 // The offset value is scaled appropriately for the target machine. | |
83 // (See relocInfo_<arch>.hpp for the offset scaling.) | |
84 // | |
85 // On some machines, there may also be a "format" field which may provide | |
86 // additional information about the format of the instruction stream | |
87 // at the corresponding code address. The format value is usually zero. | |
88 // Any machine (such as Intel) whose instructions can sometimes contain | |
89 // more than one relocatable constant needs format codes to distinguish | |
90 // which operand goes with a given relocation. | |
91 // | |
92 // If the target machine needs N format bits, the offset has 12-N bits, | |
93 // the format is encoded between the offset and the type, and the | |
94 // relocInfo_<arch>.hpp file has manifest constants for the format codes. | |
95 // | |
96 // If the type is "data_prefix_tag" then the offset bits are further encoded, | |
97 // and in fact represent not a code-stream offset but some inline data. | |
98 // The data takes the form of a counted sequence of halfwords, which | |
99 // precedes the actual relocation record. (Clients never see it directly.) | |
100 // The interpetation of this extra data depends on the relocation type. | |
101 // | |
102 // On machines that have 32-bit immediate fields, there is usually | |
103 // little need for relocation "prefix" data, because the instruction stream | |
104 // is a perfectly reasonable place to store the value. On machines in | |
105 // which 32-bit values must be "split" across instructions, the relocation | |
106 // data is the "true" specification of the value, which is then applied | |
107 // to some field of the instruction (22 or 13 bits, on SPARC). | |
108 // | |
109 // Whenever the location of the CodeBlob changes, any PC-relative | |
110 // relocations, and any internal_word_type relocations, must be reapplied. | |
111 // After the GC runs, oop_type relocations must be reapplied. | |
112 // | |
113 // | |
114 // Here are meanings of the types: | |
115 // | |
116 // relocInfo::none -- a filler record | |
117 // Value: none | |
118 // Instruction: The corresponding code address is ignored | |
119 // Data: Any data prefix and format code are ignored | |
120 // (This means that any relocInfo can be disabled by setting | |
121 // its type to none. See relocInfo::remove.) | |
122 // | |
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123 // relocInfo::oop_type, relocInfo::metadata_type -- a reference to an oop or meta data |
0 | 124 // Value: an oop, or else the address (handle) of an oop |
125 // Instruction types: memory (load), set (load address) | |
126 // Data: [] an oop stored in 4 bytes of instruction | |
127 // [n] n is the index of an oop in the CodeBlob's oop pool | |
128 // [[N]n l] and l is a byte offset to be applied to the oop | |
129 // [Nn Ll] both index and offset may be 32 bits if necessary | |
130 // Here is a special hack, used only by the old compiler: | |
131 // [[N]n 00] the value is the __address__ of the nth oop in the pool | |
132 // (Note that the offset allows optimal references to class variables.) | |
133 // | |
134 // relocInfo::internal_word_type -- an address within the same CodeBlob | |
135 // relocInfo::section_word_type -- same, but can refer to another section | |
136 // Value: an address in the CodeBlob's code or constants section | |
137 // Instruction types: memory (load), set (load address) | |
138 // Data: [] stored in 4 bytes of instruction | |
139 // [[L]l] a relative offset (see [About Offsets] below) | |
140 // In the case of section_word_type, the offset is relative to a section | |
141 // base address, and the section number (e.g., SECT_INSTS) is encoded | |
142 // into the low two bits of the offset L. | |
143 // | |
144 // relocInfo::external_word_type -- a fixed address in the runtime system | |
145 // Value: an address | |
146 // Instruction types: memory (load), set (load address) | |
147 // Data: [] stored in 4 bytes of instruction | |
148 // [n] the index of a "well-known" stub (usual case on RISC) | |
149 // [Ll] a 32-bit address | |
150 // | |
151 // relocInfo::runtime_call_type -- a fixed subroutine in the runtime system | |
152 // Value: an address | |
153 // Instruction types: PC-relative call (or a PC-relative branch) | |
154 // Data: [] stored in 4 bytes of instruction | |
155 // | |
156 // relocInfo::static_call_type -- a static call | |
157 // Value: an CodeBlob, a stub, or a fixup routine | |
158 // Instruction types: a call | |
159 // Data: [] | |
160 // The identity of the callee is extracted from debugging information. | |
161 // //%note reloc_3 | |
162 // | |
163 // relocInfo::virtual_call_type -- a virtual call site (which includes an inline | |
164 // cache) | |
165 // Value: an CodeBlob, a stub, the interpreter, or a fixup routine | |
166 // Instruction types: a call, plus some associated set-oop instructions | |
167 // Data: [] the associated set-oops are adjacent to the call | |
168 // [n] n is a relative offset to the first set-oop | |
169 // [[N]n l] and l is a limit within which the set-oops occur | |
170 // [Nn Ll] both n and l may be 32 bits if necessary | |
171 // The identity of the callee is extracted from debugging information. | |
172 // | |
173 // relocInfo::opt_virtual_call_type -- a virtual call site that is statically bound | |
174 // | |
175 // Same info as a static_call_type. We use a special type, so the handling of | |
176 // virtuals and statics are separated. | |
177 // | |
178 // | |
179 // The offset n points to the first set-oop. (See [About Offsets] below.) | |
180 // In turn, the set-oop instruction specifies or contains an oop cell devoted | |
181 // exclusively to the IC call, which can be patched along with the call. | |
182 // | |
183 // The locations of any other set-oops are found by searching the relocation | |
184 // information starting at the first set-oop, and continuing until all | |
185 // relocations up through l have been inspected. The value l is another | |
186 // relative offset. (Both n and l are relative to the call's first byte.) | |
187 // | |
188 // The limit l of the search is exclusive. However, if it points within | |
189 // the call (e.g., offset zero), it is adjusted to point after the call and | |
190 // any associated machine-specific delay slot. | |
191 // | |
192 // Since the offsets could be as wide as 32-bits, these conventions | |
193 // put no restrictions whatever upon code reorganization. | |
194 // | |
195 // The compiler is responsible for ensuring that transition from a clean | |
196 // state to a monomorphic compiled state is MP-safe. This implies that | |
197 // the system must respond well to intermediate states where a random | |
198 // subset of the set-oops has been correctly from the clean state | |
199 // upon entry to the VEP of the compiled method. In the case of a | |
200 // machine (Intel) with a single set-oop instruction, the 32-bit | |
201 // immediate field must not straddle a unit of memory coherence. | |
202 // //%note reloc_3 | |
203 // | |
204 // relocInfo::static_stub_type -- an extra stub for each static_call_type | |
205 // Value: none | |
206 // Instruction types: a virtual call: { set_oop; jump; } | |
207 // Data: [[N]n] the offset of the associated static_call reloc | |
208 // This stub becomes the target of a static call which must be upgraded | |
209 // to a virtual call (because the callee is interpreted). | |
210 // See [About Offsets] below. | |
211 // //%note reloc_2 | |
212 // | |
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213 // relocInfo::poll_[return_]type -- a safepoint poll |
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214 // Value: none |
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215 // Instruction types: memory load or test |
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216 // Data: none |
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217 // |
0 | 218 // For example: |
219 // | |
220 // INSTRUCTIONS RELOC: TYPE PREFIX DATA | |
221 // ------------ ---- ----------- | |
222 // sethi %hi(myObject), R oop_type [n(myObject)] | |
223 // ld [R+%lo(myObject)+fldOffset], R2 oop_type [n(myObject) fldOffset] | |
224 // add R2, 1, R2 | |
225 // st R2, [R+%lo(myObject)+fldOffset] oop_type [n(myObject) fldOffset] | |
226 //%note reloc_1 | |
227 // | |
228 // This uses 4 instruction words, 8 relocation halfwords, | |
229 // and an entry (which is sharable) in the CodeBlob's oop pool, | |
230 // for a total of 36 bytes. | |
231 // | |
232 // Note that the compiler is responsible for ensuring the "fldOffset" when | |
233 // added to "%lo(myObject)" does not overflow the immediate fields of the | |
234 // memory instructions. | |
235 // | |
236 // | |
237 // [About Offsets] Relative offsets are supplied to this module as | |
238 // positive byte offsets, but they may be internally stored scaled | |
239 // and/or negated, depending on what is most compact for the target | |
240 // system. Since the object pointed to by the offset typically | |
241 // precedes the relocation address, it is profitable to store | |
242 // these negative offsets as positive numbers, but this decision | |
243 // is internal to the relocation information abstractions. | |
244 // | |
245 | |
246 class Relocation; | |
247 class CodeBuffer; | |
248 class CodeSection; | |
249 class RelocIterator; | |
250 | |
251 class relocInfo VALUE_OBJ_CLASS_SPEC { | |
252 friend class RelocIterator; | |
253 public: | |
254 enum relocType { | |
255 none = 0, // Used when no relocation should be generated | |
256 oop_type = 1, // embedded oop | |
257 virtual_call_type = 2, // a standard inline cache call for a virtual send | |
258 opt_virtual_call_type = 3, // a virtual call that has been statically bound (i.e., no IC cache) | |
259 static_call_type = 4, // a static send | |
260 static_stub_type = 5, // stub-entry for static send (takes care of interpreter case) | |
261 runtime_call_type = 6, // call to fixed external routine | |
262 external_word_type = 7, // reference to fixed external address | |
263 internal_word_type = 8, // reference within the current code blob | |
264 section_word_type = 9, // internal, but a cross-section reference | |
265 poll_type = 10, // polling instruction for safepoints | |
266 poll_return_type = 11, // polling instruction for safepoints at return | |
11041 | 267 metadata_type = 12, // metadata that used to be oops |
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268 trampoline_stub_type = 13, // stub-entry for trampoline |
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269 yet_unused_type_1 = 14, // Still unused |
0 | 270 data_prefix_tag = 15, // tag for a prefix (carries data arguments) |
271 type_mask = 15 // A mask which selects only the above values | |
272 }; | |
273 | |
274 protected: | |
275 unsigned short _value; | |
276 | |
277 enum RawBitsToken { RAW_BITS }; | |
278 relocInfo(relocType type, RawBitsToken ignore, int bits) | |
279 : _value((type << nontype_width) + bits) { } | |
280 | |
281 relocInfo(relocType type, RawBitsToken ignore, int off, int f) | |
282 : _value((type << nontype_width) + (off / (unsigned)offset_unit) + (f << offset_width)) { } | |
283 | |
284 public: | |
285 // constructor | |
286 relocInfo(relocType type, int offset, int format = 0) | |
287 #ifndef ASSERT | |
288 { | |
289 (*this) = relocInfo(type, RAW_BITS, offset, format); | |
290 } | |
291 #else | |
292 // Put a bunch of assertions out-of-line. | |
293 ; | |
294 #endif | |
295 | |
296 #define APPLY_TO_RELOCATIONS(visitor) \ | |
297 visitor(oop) \ | |
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298 visitor(metadata) \ |
0 | 299 visitor(virtual_call) \ |
300 visitor(opt_virtual_call) \ | |
301 visitor(static_call) \ | |
302 visitor(static_stub) \ | |
303 visitor(runtime_call) \ | |
304 visitor(external_word) \ | |
305 visitor(internal_word) \ | |
306 visitor(poll) \ | |
307 visitor(poll_return) \ | |
308 visitor(section_word) \ | |
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309 visitor(trampoline_stub) \ |
0 | 310 |
311 | |
312 public: | |
313 enum { | |
314 value_width = sizeof(unsigned short) * BitsPerByte, | |
315 type_width = 4, // == log2(type_mask+1) | |
316 nontype_width = value_width - type_width, | |
317 datalen_width = nontype_width-1, | |
318 datalen_tag = 1 << datalen_width, // or-ed into _value | |
319 datalen_limit = 1 << datalen_width, | |
320 datalen_mask = (1 << datalen_width)-1 | |
321 }; | |
322 | |
323 // accessors | |
324 public: | |
325 relocType type() const { return (relocType)((unsigned)_value >> nontype_width); } | |
326 int format() const { return format_mask==0? 0: format_mask & | |
327 ((unsigned)_value >> offset_width); } | |
328 int addr_offset() const { assert(!is_prefix(), "must have offset"); | |
329 return (_value & offset_mask)*offset_unit; } | |
330 | |
331 protected: | |
332 const short* data() const { assert(is_datalen(), "must have data"); | |
333 return (const short*)(this + 1); } | |
334 int datalen() const { assert(is_datalen(), "must have data"); | |
335 return (_value & datalen_mask); } | |
336 int immediate() const { assert(is_immediate(), "must have immed"); | |
337 return (_value & datalen_mask); } | |
338 public: | |
339 static int addr_unit() { return offset_unit; } | |
340 static int offset_limit() { return (1 << offset_width) * offset_unit; } | |
341 | |
342 void set_type(relocType type); | |
343 void set_format(int format); | |
344 | |
345 void remove() { set_type(none); } | |
346 | |
347 protected: | |
348 bool is_none() const { return type() == none; } | |
349 bool is_prefix() const { return type() == data_prefix_tag; } | |
350 bool is_datalen() const { assert(is_prefix(), "must be prefix"); | |
351 return (_value & datalen_tag) != 0; } | |
352 bool is_immediate() const { assert(is_prefix(), "must be prefix"); | |
353 return (_value & datalen_tag) == 0; } | |
354 | |
355 public: | |
356 // Occasionally records of type relocInfo::none will appear in the stream. | |
357 // We do not bother to filter these out, but clients should ignore them. | |
358 // These records serve as "filler" in three ways: | |
359 // - to skip large spans of unrelocated code (this is rare) | |
360 // - to pad out the relocInfo array to the required oop alignment | |
361 // - to disable old relocation information which is no longer applicable | |
362 | |
363 inline friend relocInfo filler_relocInfo(); | |
364 | |
365 // Every non-prefix relocation may be preceded by at most one prefix, | |
366 // which supplies 1 or more halfwords of associated data. Conventionally, | |
367 // an int is represented by 0, 1, or 2 halfwords, depending on how | |
368 // many bits are required to represent the value. (In addition, | |
369 // if the sole halfword is a 10-bit unsigned number, it is made | |
370 // "immediate" in the prefix header word itself. This optimization | |
371 // is invisible outside this module.) | |
372 | |
14411 | 373 inline friend relocInfo prefix_relocInfo(int datalen); |
0 | 374 |
375 protected: | |
376 // an immediate relocInfo optimizes a prefix with one 10-bit unsigned value | |
377 static relocInfo immediate_relocInfo(int data0) { | |
378 assert(fits_into_immediate(data0), "data0 in limits"); | |
379 return relocInfo(relocInfo::data_prefix_tag, RAW_BITS, data0); | |
380 } | |
381 static bool fits_into_immediate(int data0) { | |
382 return (data0 >= 0 && data0 < datalen_limit); | |
383 } | |
384 | |
385 public: | |
386 // Support routines for compilers. | |
387 | |
388 // This routine takes an infant relocInfo (unprefixed) and | |
389 // edits in its prefix, if any. It also updates dest.locs_end. | |
390 void initialize(CodeSection* dest, Relocation* reloc); | |
391 | |
392 // This routine updates a prefix and returns the limit pointer. | |
393 // It tries to compress the prefix from 32 to 16 bits, and if | |
394 // successful returns a reduced "prefix_limit" pointer. | |
395 relocInfo* finish_prefix(short* prefix_limit); | |
396 | |
397 // bit-packers for the data array: | |
398 | |
399 // As it happens, the bytes within the shorts are ordered natively, | |
400 // but the shorts within the word are ordered big-endian. | |
401 // This is an arbitrary choice, made this way mainly to ease debugging. | |
402 static int data0_from_int(jint x) { return x >> value_width; } | |
403 static int data1_from_int(jint x) { return (short)x; } | |
404 static jint jint_from_data(short* data) { | |
405 return (data[0] << value_width) + (unsigned short)data[1]; | |
406 } | |
407 | |
408 static jint short_data_at(int n, short* data, int datalen) { | |
409 return datalen > n ? data[n] : 0; | |
410 } | |
411 | |
412 static jint jint_data_at(int n, short* data, int datalen) { | |
413 return datalen > n+1 ? jint_from_data(&data[n]) : short_data_at(n, data, datalen); | |
414 } | |
415 | |
416 // Update methods for relocation information | |
417 // (since code is dynamically patched, we also need to dynamically update the relocation info) | |
418 // Both methods takes old_type, so it is able to performe sanity checks on the information removed. | |
419 static void change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type); | |
420 static void remove_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type); | |
421 | |
422 // Machine dependent stuff | |
1972 | 423 #ifdef TARGET_ARCH_x86 |
424 # include "relocInfo_x86.hpp" | |
425 #endif | |
426 #ifdef TARGET_ARCH_sparc | |
427 # include "relocInfo_sparc.hpp" | |
428 #endif | |
429 #ifdef TARGET_ARCH_zero | |
430 # include "relocInfo_zero.hpp" | |
431 #endif | |
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432 #ifdef TARGET_ARCH_arm |
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433 # include "relocInfo_arm.hpp" |
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434 #endif |
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435 #ifdef TARGET_ARCH_ppc |
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436 # include "relocInfo_ppc.hpp" |
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437 #endif |
1972 | 438 |
0 | 439 |
440 protected: | |
441 // Derived constant, based on format_width which is PD: | |
442 enum { | |
443 offset_width = nontype_width - format_width, | |
444 offset_mask = (1<<offset_width) - 1, | |
445 format_mask = (1<<format_width) - 1 | |
446 }; | |
447 public: | |
448 enum { | |
449 // Conservatively large estimate of maximum length (in shorts) | |
11041 | 450 // of any relocation record. |
0 | 451 // Extended format is length prefix, data words, and tag/offset suffix. |
452 length_limit = 1 + 1 + (3*BytesPerWord/BytesPerShort) + 1, | |
453 have_format = format_width > 0 | |
454 }; | |
455 }; | |
456 | |
457 #define FORWARD_DECLARE_EACH_CLASS(name) \ | |
458 class name##_Relocation; | |
459 APPLY_TO_RELOCATIONS(FORWARD_DECLARE_EACH_CLASS) | |
460 #undef FORWARD_DECLARE_EACH_CLASS | |
461 | |
462 | |
463 | |
464 inline relocInfo filler_relocInfo() { | |
465 return relocInfo(relocInfo::none, relocInfo::offset_limit() - relocInfo::offset_unit); | |
466 } | |
467 | |
14411 | 468 inline relocInfo prefix_relocInfo(int datalen = 0) { |
0 | 469 assert(relocInfo::fits_into_immediate(datalen), "datalen in limits"); |
470 return relocInfo(relocInfo::data_prefix_tag, relocInfo::RAW_BITS, relocInfo::datalen_tag | datalen); | |
471 } | |
472 | |
473 | |
474 // Holder for flyweight relocation objects. | |
475 // Although the flyweight subclasses are of varying sizes, | |
476 // the holder is "one size fits all". | |
477 class RelocationHolder VALUE_OBJ_CLASS_SPEC { | |
478 friend class Relocation; | |
479 friend class CodeSection; | |
480 | |
481 private: | |
482 // this preallocated memory must accommodate all subclasses of Relocation | |
483 // (this number is assertion-checked in Relocation::operator new) | |
484 enum { _relocbuf_size = 5 }; | |
485 void* _relocbuf[ _relocbuf_size ]; | |
486 | |
487 public: | |
488 Relocation* reloc() const { return (Relocation*) &_relocbuf[0]; } | |
489 inline relocInfo::relocType type() const; | |
490 | |
491 // Add a constant offset to a relocation. Helper for class Address. | |
492 RelocationHolder plus(int offset) const; | |
493 | |
494 inline RelocationHolder(); // initializes type to none | |
495 | |
496 inline RelocationHolder(Relocation* r); // make a copy | |
497 | |
498 static const RelocationHolder none; | |
499 }; | |
500 | |
501 // A RelocIterator iterates through the relocation information of a CodeBlob. | |
502 // It is a variable BoundRelocation which is able to take on successive | |
503 // values as it is advanced through a code stream. | |
504 // Usage: | |
505 // RelocIterator iter(nm); | |
506 // while (iter.next()) { | |
507 // iter.reloc()->some_operation(); | |
508 // } | |
509 // or: | |
510 // RelocIterator iter(nm); | |
511 // while (iter.next()) { | |
512 // switch (iter.type()) { | |
513 // case relocInfo::oop_type : | |
514 // case relocInfo::ic_type : | |
515 // case relocInfo::prim_type : | |
516 // case relocInfo::uncommon_type : | |
517 // case relocInfo::runtime_call_type : | |
518 // case relocInfo::internal_word_type: | |
519 // case relocInfo::external_word_type: | |
520 // ... | |
521 // } | |
522 // } | |
523 | |
524 class RelocIterator : public StackObj { | |
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525 enum { SECT_LIMIT = 3 }; // must be equal to CodeBuffer::SECT_LIMIT, checked in ctor |
0 | 526 friend class Relocation; |
527 friend class relocInfo; // for change_reloc_info_for_address only | |
528 typedef relocInfo::relocType relocType; | |
529 | |
530 private: | |
531 address _limit; // stop producing relocations after this _addr | |
532 relocInfo* _current; // the current relocation information | |
533 relocInfo* _end; // end marker; we're done iterating when _current == _end | |
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534 nmethod* _code; // compiled method containing _addr |
0 | 535 address _addr; // instruction to which the relocation applies |
536 short _databuf; // spare buffer for compressed data | |
537 short* _data; // pointer to the relocation's data | |
538 short _datalen; // number of halfwords in _data | |
539 char _format; // position within the instruction | |
540 | |
541 // Base addresses needed to compute targets of section_word_type relocs. | |
542 address _section_start[SECT_LIMIT]; | |
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543 address _section_end [SECT_LIMIT]; |
0 | 544 |
545 void set_has_current(bool b) { | |
546 _datalen = !b ? -1 : 0; | |
547 debug_only(_data = NULL); | |
548 } | |
549 void set_current(relocInfo& ri) { | |
550 _current = &ri; | |
551 set_has_current(true); | |
552 } | |
553 | |
554 RelocationHolder _rh; // where the current relocation is allocated | |
555 | |
556 relocInfo* current() const { assert(has_current(), "must have current"); | |
557 return _current; } | |
558 | |
559 void set_limits(address begin, address limit); | |
560 | |
561 void advance_over_prefix(); // helper method | |
562 | |
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563 void initialize_misc(); |
0 | 564 |
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565 void initialize(nmethod* nm, address begin, address limit); |
0 | 566 |
567 RelocIterator() { initialize_misc(); } | |
568 | |
569 public: | |
570 // constructor | |
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571 RelocIterator(nmethod* nm, address begin = NULL, address limit = NULL); |
0 | 572 RelocIterator(CodeSection* cb, address begin = NULL, address limit = NULL); |
573 | |
574 // get next reloc info, return !eos | |
575 bool next() { | |
576 _current++; | |
577 assert(_current <= _end, "must not overrun relocInfo"); | |
578 if (_current == _end) { | |
579 set_has_current(false); | |
580 return false; | |
581 } | |
582 set_has_current(true); | |
583 | |
584 if (_current->is_prefix()) { | |
585 advance_over_prefix(); | |
586 assert(!current()->is_prefix(), "only one prefix at a time"); | |
587 } | |
588 | |
589 _addr += _current->addr_offset(); | |
590 | |
591 if (_limit != NULL && _addr >= _limit) { | |
592 set_has_current(false); | |
593 return false; | |
594 } | |
595 | |
596 if (relocInfo::have_format) _format = current()->format(); | |
597 return true; | |
598 } | |
599 | |
600 // accessors | |
601 address limit() const { return _limit; } | |
602 void set_limit(address x); | |
603 relocType type() const { return current()->type(); } | |
604 int format() const { return (relocInfo::have_format) ? current()->format() : 0; } | |
605 address addr() const { return _addr; } | |
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606 nmethod* code() const { return _code; } |
0 | 607 short* data() const { return _data; } |
608 int datalen() const { return _datalen; } | |
609 bool has_current() const { return _datalen >= 0; } | |
610 | |
611 void set_addr(address addr) { _addr = addr; } | |
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612 bool addr_in_const() const; |
0 | 613 |
614 address section_start(int n) const { | |
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615 assert(_section_start[n], "must be initialized"); |
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616 return _section_start[n]; |
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617 } |
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618 address section_end(int n) const { |
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619 assert(_section_end[n], "must be initialized"); |
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620 return _section_end[n]; |
0 | 621 } |
622 | |
623 // The address points to the affected displacement part of the instruction. | |
624 // For RISC, this is just the whole instruction. | |
625 // For Intel, this is an unaligned 32-bit word. | |
626 | |
627 // type-specific relocation accessors: oop_Relocation* oop_reloc(), etc. | |
628 #define EACH_TYPE(name) \ | |
629 inline name##_Relocation* name##_reloc(); | |
630 APPLY_TO_RELOCATIONS(EACH_TYPE) | |
631 #undef EACH_TYPE | |
632 // generic relocation accessor; switches on type to call the above | |
633 Relocation* reloc(); | |
634 | |
635 // CodeBlob's have relocation indexes for faster random access: | |
636 static int locs_and_index_size(int code_size, int locs_size); | |
637 // Store an index into [dest_start+dest_count..dest_end). | |
638 // At dest_start[0..dest_count] is the actual relocation information. | |
639 // Everything else up to dest_end is free space for the index. | |
640 static void create_index(relocInfo* dest_begin, int dest_count, relocInfo* dest_end); | |
641 | |
642 #ifndef PRODUCT | |
643 public: | |
644 void print(); | |
645 void print_current(); | |
646 #endif | |
647 }; | |
648 | |
649 | |
650 // A Relocation is a flyweight object allocated within a RelocationHolder. | |
651 // It represents the relocation data of relocation record. | |
652 // So, the RelocIterator unpacks relocInfos into Relocations. | |
653 | |
654 class Relocation VALUE_OBJ_CLASS_SPEC { | |
655 friend class RelocationHolder; | |
656 friend class RelocIterator; | |
657 | |
658 private: | |
659 static void guarantee_size(); | |
660 | |
661 // When a relocation has been created by a RelocIterator, | |
662 // this field is non-null. It allows the relocation to know | |
663 // its context, such as the address to which it applies. | |
664 RelocIterator* _binding; | |
665 | |
666 protected: | |
667 RelocIterator* binding() const { | |
668 assert(_binding != NULL, "must be bound"); | |
669 return _binding; | |
670 } | |
671 void set_binding(RelocIterator* b) { | |
672 assert(_binding == NULL, "must be unbound"); | |
673 _binding = b; | |
674 assert(_binding != NULL, "must now be bound"); | |
675 } | |
676 | |
677 Relocation() { | |
678 _binding = NULL; | |
679 } | |
680 | |
681 static RelocationHolder newHolder() { | |
682 return RelocationHolder(); | |
683 } | |
684 | |
685 public: | |
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686 void* operator new(size_t size, const RelocationHolder& holder) throw() { |
0 | 687 if (size > sizeof(holder._relocbuf)) guarantee_size(); |
688 assert((void* const *)holder.reloc() == &holder._relocbuf[0], "ptrs must agree"); | |
689 return holder.reloc(); | |
690 } | |
691 | |
692 // make a generic relocation for a given type (if possible) | |
693 static RelocationHolder spec_simple(relocInfo::relocType rtype); | |
694 | |
695 // here is the type-specific hook which writes relocation data: | |
696 virtual void pack_data_to(CodeSection* dest) { } | |
697 | |
698 // here is the type-specific hook which reads (unpacks) relocation data: | |
699 virtual void unpack_data() { | |
700 assert(datalen()==0 || type()==relocInfo::none, "no data here"); | |
701 } | |
702 | |
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703 static bool is_reloc_index(intptr_t index) { |
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704 return 0 < index && index < os::vm_page_size(); |
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705 } |
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706 |
0 | 707 protected: |
708 // Helper functions for pack_data_to() and unpack_data(). | |
709 | |
710 // Most of the compression logic is confined here. | |
711 // (The "immediate data" mechanism of relocInfo works independently | |
712 // of this stuff, and acts to further compress most 1-word data prefixes.) | |
713 | |
714 // A variable-width int is encoded as a short if it will fit in 16 bits. | |
715 // The decoder looks at datalen to decide whether to unpack short or jint. | |
716 // Most relocation records are quite simple, containing at most two ints. | |
717 | |
718 static bool is_short(jint x) { return x == (short)x; } | |
719 static short* add_short(short* p, int x) { *p++ = x; return p; } | |
720 static short* add_jint (short* p, jint x) { | |
721 *p++ = relocInfo::data0_from_int(x); *p++ = relocInfo::data1_from_int(x); | |
722 return p; | |
723 } | |
724 static short* add_var_int(short* p, jint x) { // add a variable-width int | |
725 if (is_short(x)) p = add_short(p, x); | |
726 else p = add_jint (p, x); | |
727 return p; | |
728 } | |
729 | |
730 static short* pack_1_int_to(short* p, jint x0) { | |
731 // Format is one of: [] [x] [Xx] | |
732 if (x0 != 0) p = add_var_int(p, x0); | |
733 return p; | |
734 } | |
735 int unpack_1_int() { | |
736 assert(datalen() <= 2, "too much data"); | |
737 return relocInfo::jint_data_at(0, data(), datalen()); | |
738 } | |
739 | |
740 // With two ints, the short form is used only if both ints are short. | |
741 short* pack_2_ints_to(short* p, jint x0, jint x1) { | |
742 // Format is one of: [] [x y?] [Xx Y?y] | |
743 if (x0 == 0 && x1 == 0) { | |
744 // no halfwords needed to store zeroes | |
745 } else if (is_short(x0) && is_short(x1)) { | |
746 // 1-2 halfwords needed to store shorts | |
747 p = add_short(p, x0); if (x1!=0) p = add_short(p, x1); | |
748 } else { | |
749 // 3-4 halfwords needed to store jints | |
750 p = add_jint(p, x0); p = add_var_int(p, x1); | |
751 } | |
752 return p; | |
753 } | |
754 void unpack_2_ints(jint& x0, jint& x1) { | |
755 int dlen = datalen(); | |
756 short* dp = data(); | |
757 if (dlen <= 2) { | |
758 x0 = relocInfo::short_data_at(0, dp, dlen); | |
759 x1 = relocInfo::short_data_at(1, dp, dlen); | |
760 } else { | |
761 assert(dlen <= 4, "too much data"); | |
762 x0 = relocInfo::jint_data_at(0, dp, dlen); | |
763 x1 = relocInfo::jint_data_at(2, dp, dlen); | |
764 } | |
765 } | |
766 | |
767 protected: | |
768 // platform-dependent utilities for decoding and patching instructions | |
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769 void pd_set_data_value (address x, intptr_t off, bool verify_only = false); // a set or mem-ref |
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770 void pd_verify_data_value (address x, intptr_t off) { pd_set_data_value(x, off, true); } |
0 | 771 address pd_call_destination (address orig_addr = NULL); |
772 void pd_set_call_destination (address x); | |
773 | |
774 // this extracts the address of an address in the code stream instead of the reloc data | |
775 address* pd_address_in_code (); | |
776 | |
777 // this extracts an address from the code stream instead of the reloc data | |
778 address pd_get_address_from_code (); | |
779 | |
780 // these convert from byte offsets, to scaled offsets, to addresses | |
781 static jint scaled_offset(address x, address base) { | |
782 int byte_offset = x - base; | |
783 int offset = -byte_offset / relocInfo::addr_unit(); | |
784 assert(address_from_scaled_offset(offset, base) == x, "just checkin'"); | |
785 return offset; | |
786 } | |
787 static jint scaled_offset_null_special(address x, address base) { | |
788 // Some relocations treat offset=0 as meaning NULL. | |
789 // Handle this extra convention carefully. | |
790 if (x == NULL) return 0; | |
791 assert(x != base, "offset must not be zero"); | |
792 return scaled_offset(x, base); | |
793 } | |
794 static address address_from_scaled_offset(jint offset, address base) { | |
795 int byte_offset = -( offset * relocInfo::addr_unit() ); | |
796 return base + byte_offset; | |
797 } | |
798 | |
799 // these convert between indexes and addresses in the runtime system | |
800 static int32_t runtime_address_to_index(address runtime_address); | |
801 static address index_to_runtime_address(int32_t index); | |
802 | |
803 // helpers for mapping between old and new addresses after a move or resize | |
804 address old_addr_for(address newa, const CodeBuffer* src, CodeBuffer* dest); | |
805 address new_addr_for(address olda, const CodeBuffer* src, CodeBuffer* dest); | |
806 void normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections = false); | |
807 | |
808 public: | |
809 // accessors which only make sense for a bound Relocation | |
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810 address addr() const { return binding()->addr(); } |
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811 nmethod* code() const { return binding()->code(); } |
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812 bool addr_in_const() const { return binding()->addr_in_const(); } |
0 | 813 protected: |
814 short* data() const { return binding()->data(); } | |
815 int datalen() const { return binding()->datalen(); } | |
816 int format() const { return binding()->format(); } | |
817 | |
818 public: | |
819 virtual relocInfo::relocType type() { return relocInfo::none; } | |
820 | |
821 // is it a call instruction? | |
822 virtual bool is_call() { return false; } | |
823 | |
824 // is it a data movement instruction? | |
825 virtual bool is_data() { return false; } | |
826 | |
827 // some relocations can compute their own values | |
828 virtual address value(); | |
829 | |
830 // all relocations are able to reassert their values | |
831 virtual void set_value(address x); | |
832 | |
833 virtual void clear_inline_cache() { } | |
834 | |
835 // This method assumes that all virtual/static (inline) caches are cleared (since for static_call_type and | |
836 // ic_call_type is not always posisition dependent (depending on the state of the cache)). However, this is | |
837 // probably a reasonable assumption, since empty caches simplifies code reloacation. | |
838 virtual void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { } | |
839 | |
840 void print(); | |
841 }; | |
842 | |
843 | |
844 // certain inlines must be deferred until class Relocation is defined: | |
845 | |
846 inline RelocationHolder::RelocationHolder() { | |
847 // initialize the vtbl, just to keep things type-safe | |
848 new(*this) Relocation(); | |
849 } | |
850 | |
851 | |
852 inline RelocationHolder::RelocationHolder(Relocation* r) { | |
853 // wordwise copy from r (ok if it copies garbage after r) | |
854 for (int i = 0; i < _relocbuf_size; i++) { | |
855 _relocbuf[i] = ((void**)r)[i]; | |
856 } | |
857 } | |
858 | |
859 | |
860 relocInfo::relocType RelocationHolder::type() const { | |
861 return reloc()->type(); | |
862 } | |
863 | |
864 // A DataRelocation always points at a memory or load-constant instruction.. | |
865 // It is absolute on most machines, and the constant is split on RISCs. | |
866 // The specific subtypes are oop, external_word, and internal_word. | |
867 // By convention, the "value" does not include a separately reckoned "offset". | |
868 class DataRelocation : public Relocation { | |
869 public: | |
870 bool is_data() { return true; } | |
871 | |
872 // both target and offset must be computed somehow from relocation data | |
873 virtual int offset() { return 0; } | |
874 address value() = 0; | |
875 void set_value(address x) { set_value(x, offset()); } | |
876 void set_value(address x, intptr_t o) { | |
877 if (addr_in_const()) | |
878 *(address*)addr() = x; | |
879 else | |
880 pd_set_data_value(x, o); | |
881 } | |
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882 void verify_value(address x) { |
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883 if (addr_in_const()) |
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884 assert(*(address*)addr() == x, "must agree"); |
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885 else |
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886 pd_verify_data_value(x, offset()); |
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887 } |
0 | 888 |
889 // The "o" (displacement) argument is relevant only to split relocations | |
890 // on RISC machines. In some CPUs (SPARC), the set-hi and set-lo ins'ns | |
891 // can encode more than 32 bits between them. This allows compilers to | |
892 // share set-hi instructions between addresses that differ by a small | |
893 // offset (e.g., different static variables in the same class). | |
894 // On such machines, the "x" argument to set_value on all set-lo | |
895 // instructions must be the same as the "x" argument for the | |
896 // corresponding set-hi instructions. The "o" arguments for the | |
897 // set-hi instructions are ignored, and must not affect the high-half | |
898 // immediate constant. The "o" arguments for the set-lo instructions are | |
899 // added into the low-half immediate constant, and must not overflow it. | |
900 }; | |
901 | |
902 // A CallRelocation always points at a call instruction. | |
903 // It is PC-relative on most machines. | |
904 class CallRelocation : public Relocation { | |
905 public: | |
906 bool is_call() { return true; } | |
907 | |
908 address destination() { return pd_call_destination(); } | |
909 void set_destination(address x); // pd_set_call_destination | |
910 | |
911 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
912 address value() { return destination(); } | |
913 void set_value(address x) { set_destination(x); } | |
914 }; | |
915 | |
916 class oop_Relocation : public DataRelocation { | |
917 relocInfo::relocType type() { return relocInfo::oop_type; } | |
918 | |
919 public: | |
920 // encode in one of these formats: [] [n] [n l] [Nn l] [Nn Ll] | |
921 // an oop in the CodeBlob's oop pool | |
922 static RelocationHolder spec(int oop_index, int offset = 0) { | |
923 assert(oop_index > 0, "must be a pool-resident oop"); | |
924 RelocationHolder rh = newHolder(); | |
925 new(rh) oop_Relocation(oop_index, offset); | |
926 return rh; | |
927 } | |
928 // an oop in the instruction stream | |
929 static RelocationHolder spec_for_immediate() { | |
930 const int oop_index = 0; | |
931 const int offset = 0; // if you want an offset, use the oop pool | |
932 RelocationHolder rh = newHolder(); | |
933 new(rh) oop_Relocation(oop_index, offset); | |
934 return rh; | |
935 } | |
936 | |
937 private: | |
938 jint _oop_index; // if > 0, index into CodeBlob::oop_at | |
939 jint _offset; // byte offset to apply to the oop itself | |
940 | |
941 oop_Relocation(int oop_index, int offset) { | |
942 _oop_index = oop_index; _offset = offset; | |
943 } | |
944 | |
945 friend class RelocIterator; | |
946 oop_Relocation() { } | |
947 | |
948 public: | |
949 int oop_index() { return _oop_index; } | |
950 int offset() { return _offset; } | |
951 | |
952 // data is packed in "2_ints" format: [i o] or [Ii Oo] | |
953 void pack_data_to(CodeSection* dest); | |
954 void unpack_data(); | |
955 | |
956 void fix_oop_relocation(); // reasserts oop value | |
957 | |
2375
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958 void verify_oop_relocation(); |
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959 |
0 | 960 address value() { return (address) *oop_addr(); } |
961 | |
962 bool oop_is_immediate() { return oop_index() == 0; } | |
963 | |
964 oop* oop_addr(); // addr or &pool[jint_data] | |
965 oop oop_value(); // *oop_addr | |
966 // Note: oop_value transparently converts Universe::non_oop_word to NULL. | |
967 }; | |
968 | |
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969 |
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970 // copy of oop_Relocation for now but may delete stuff in both/either |
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971 class metadata_Relocation : public DataRelocation { |
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972 relocInfo::relocType type() { return relocInfo::metadata_type; } |
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973 |
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974 public: |
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975 // encode in one of these formats: [] [n] [n l] [Nn l] [Nn Ll] |
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976 // an metadata in the CodeBlob's metadata pool |
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977 static RelocationHolder spec(int metadata_index, int offset = 0) { |
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978 assert(metadata_index > 0, "must be a pool-resident metadata"); |
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979 RelocationHolder rh = newHolder(); |
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980 new(rh) metadata_Relocation(metadata_index, offset); |
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981 return rh; |
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982 } |
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983 // an metadata in the instruction stream |
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984 static RelocationHolder spec_for_immediate() { |
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985 const int metadata_index = 0; |
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986 const int offset = 0; // if you want an offset, use the metadata pool |
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987 RelocationHolder rh = newHolder(); |
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988 new(rh) metadata_Relocation(metadata_index, offset); |
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989 return rh; |
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990 } |
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991 |
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992 private: |
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993 jint _metadata_index; // if > 0, index into nmethod::metadata_at |
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994 jint _offset; // byte offset to apply to the metadata itself |
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995 |
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996 metadata_Relocation(int metadata_index, int offset) { |
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997 _metadata_index = metadata_index; _offset = offset; |
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998 } |
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999 |
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1000 friend class RelocIterator; |
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1001 metadata_Relocation() { } |
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1002 |
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1003 // Fixes a Metadata pointer in the code. Most platforms embeds the |
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1004 // Metadata pointer in the code at compile time so this is empty |
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1005 // for them. |
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1006 void pd_fix_value(address x); |
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1007 |
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1008 public: |
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1009 int metadata_index() { return _metadata_index; } |
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1010 int offset() { return _offset; } |
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1011 |
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1012 // data is packed in "2_ints" format: [i o] or [Ii Oo] |
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1013 void pack_data_to(CodeSection* dest); |
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1014 void unpack_data(); |
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1015 |
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1016 void fix_metadata_relocation(); // reasserts metadata value |
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1017 |
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1018 void verify_metadata_relocation(); |
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1019 |
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1020 address value() { return (address) *metadata_addr(); } |
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1021 |
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1022 bool metadata_is_immediate() { return metadata_index() == 0; } |
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1023 |
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1024 Metadata** metadata_addr(); // addr or &pool[jint_data] |
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1025 Metadata* metadata_value(); // *metadata_addr |
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1026 // Note: metadata_value transparently converts Universe::non_metadata_word to NULL. |
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1027 }; |
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1028 |
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1029 |
0 | 1030 class virtual_call_Relocation : public CallRelocation { |
1031 relocInfo::relocType type() { return relocInfo::virtual_call_type; } | |
1032 | |
1033 public: | |
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1034 // "cached_value" points to the first associated set-oop. |
0 | 1035 // The oop_limit helps find the last associated set-oop. |
1036 // (See comments at the top of this file.) | |
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1037 static RelocationHolder spec(address cached_value) { |
0 | 1038 RelocationHolder rh = newHolder(); |
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1039 new(rh) virtual_call_Relocation(cached_value); |
0 | 1040 return rh; |
1041 } | |
1042 | |
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1043 virtual_call_Relocation(address cached_value) { |
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1044 _cached_value = cached_value; |
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1045 assert(cached_value != NULL, "first oop address must be specified"); |
0 | 1046 } |
1047 | |
1048 private: | |
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1049 address _cached_value; // location of set-value instruction |
0 | 1050 |
1051 friend class RelocIterator; | |
1052 virtual_call_Relocation() { } | |
1053 | |
1054 | |
1055 public: | |
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1056 address cached_value(); |
0 | 1057 |
1058 // data is packed as scaled offsets in "2_ints" format: [f l] or [Ff Ll] | |
1059 // oop_limit is set to 0 if the limit falls somewhere within the call. | |
1060 // When unpacking, a zero oop_limit is taken to refer to the end of the call. | |
1061 // (This has the effect of bringing in the call's delay slot on SPARC.) | |
1062 void pack_data_to(CodeSection* dest); | |
1063 void unpack_data(); | |
1064 | |
1065 void clear_inline_cache(); | |
1066 }; | |
1067 | |
1068 | |
1069 class opt_virtual_call_Relocation : public CallRelocation { | |
1070 relocInfo::relocType type() { return relocInfo::opt_virtual_call_type; } | |
1071 | |
1072 public: | |
1073 static RelocationHolder spec() { | |
1074 RelocationHolder rh = newHolder(); | |
1075 new(rh) opt_virtual_call_Relocation(); | |
1076 return rh; | |
1077 } | |
1078 | |
1079 private: | |
1080 friend class RelocIterator; | |
1081 opt_virtual_call_Relocation() { } | |
1082 | |
1083 public: | |
1084 void clear_inline_cache(); | |
1085 | |
1086 // find the matching static_stub | |
1087 address static_stub(); | |
1088 }; | |
1089 | |
1090 | |
1091 class static_call_Relocation : public CallRelocation { | |
1092 relocInfo::relocType type() { return relocInfo::static_call_type; } | |
1093 | |
1094 public: | |
1095 static RelocationHolder spec() { | |
1096 RelocationHolder rh = newHolder(); | |
1097 new(rh) static_call_Relocation(); | |
1098 return rh; | |
1099 } | |
1100 | |
1101 private: | |
1102 friend class RelocIterator; | |
1103 static_call_Relocation() { } | |
1104 | |
1105 public: | |
1106 void clear_inline_cache(); | |
1107 | |
1108 // find the matching static_stub | |
1109 address static_stub(); | |
1110 }; | |
1111 | |
1112 class static_stub_Relocation : public Relocation { | |
1113 relocInfo::relocType type() { return relocInfo::static_stub_type; } | |
1114 | |
1115 public: | |
1116 static RelocationHolder spec(address static_call) { | |
1117 RelocationHolder rh = newHolder(); | |
1118 new(rh) static_stub_Relocation(static_call); | |
1119 return rh; | |
1120 } | |
1121 | |
1122 private: | |
1123 address _static_call; // location of corresponding static_call | |
1124 | |
1125 static_stub_Relocation(address static_call) { | |
1126 _static_call = static_call; | |
1127 } | |
1128 | |
1129 friend class RelocIterator; | |
1130 static_stub_Relocation() { } | |
1131 | |
1132 public: | |
1133 void clear_inline_cache(); | |
1134 | |
1135 address static_call() { return _static_call; } | |
1136 | |
1137 // data is packed as a scaled offset in "1_int" format: [c] or [Cc] | |
1138 void pack_data_to(CodeSection* dest); | |
1139 void unpack_data(); | |
1140 }; | |
1141 | |
1142 class runtime_call_Relocation : public CallRelocation { | |
1143 relocInfo::relocType type() { return relocInfo::runtime_call_type; } | |
1144 | |
1145 public: | |
1146 static RelocationHolder spec() { | |
1147 RelocationHolder rh = newHolder(); | |
1148 new(rh) runtime_call_Relocation(); | |
1149 return rh; | |
1150 } | |
1151 | |
1152 private: | |
1153 friend class RelocIterator; | |
1154 runtime_call_Relocation() { } | |
1155 | |
1156 public: | |
1157 }; | |
1158 | |
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1159 // Trampoline Relocations. |
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1160 // A trampoline allows to encode a small branch in the code, even if there |
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1161 // is the chance that this branch can not reach all possible code locations. |
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1162 // If the relocation finds that a branch is too far for the instruction |
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1163 // in the code, it can patch it to jump to the trampoline where is |
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1164 // sufficient space for a far branch. Needed on PPC. |
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1165 class trampoline_stub_Relocation : public Relocation { |
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1166 relocInfo::relocType type() { return relocInfo::trampoline_stub_type; } |
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1167 |
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1168 public: |
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1169 static RelocationHolder spec(address static_call) { |
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1170 RelocationHolder rh = newHolder(); |
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1171 return (new (rh) trampoline_stub_Relocation(static_call)); |
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1172 } |
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1173 |
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1174 private: |
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1175 address _owner; // Address of the NativeCall that owns the trampoline. |
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1176 |
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1177 trampoline_stub_Relocation(address owner) { |
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1178 _owner = owner; |
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1179 } |
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1180 |
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1181 friend class RelocIterator; |
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1182 trampoline_stub_Relocation() { } |
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1183 |
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1184 public: |
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1185 |
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1186 // Return the address of the NativeCall that owns the trampoline. |
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1187 address owner() { return _owner; } |
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1188 |
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1189 void pack_data_to(CodeSection * dest); |
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1190 void unpack_data(); |
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1191 |
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1192 // Find the trampoline stub for a call. |
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1193 static address get_trampoline_for(address call, nmethod* code); |
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1194 }; |
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1195 |
0 | 1196 class external_word_Relocation : public DataRelocation { |
1197 relocInfo::relocType type() { return relocInfo::external_word_type; } | |
1198 | |
1199 public: | |
1200 static RelocationHolder spec(address target) { | |
1201 assert(target != NULL, "must not be null"); | |
1202 RelocationHolder rh = newHolder(); | |
1203 new(rh) external_word_Relocation(target); | |
1204 return rh; | |
1205 } | |
1206 | |
1207 // Use this one where all 32/64 bits of the target live in the code stream. | |
1208 // The target must be an intptr_t, and must be absolute (not relative). | |
1209 static RelocationHolder spec_for_immediate() { | |
1210 RelocationHolder rh = newHolder(); | |
1211 new(rh) external_word_Relocation(NULL); | |
1212 return rh; | |
1213 } | |
1214 | |
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1215 // Some address looking values aren't safe to treat as relocations |
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1216 // and should just be treated as constants. |
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1217 static bool can_be_relocated(address target) { |
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1218 return target != NULL && !is_reloc_index((intptr_t)target); |
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1219 } |
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1220 |
0 | 1221 private: |
1222 address _target; // address in runtime | |
1223 | |
1224 external_word_Relocation(address target) { | |
1225 _target = target; | |
1226 } | |
1227 | |
1228 friend class RelocIterator; | |
1229 external_word_Relocation() { } | |
1230 | |
1231 public: | |
1232 // data is packed as a well-known address in "1_int" format: [a] or [Aa] | |
1233 // The function runtime_address_to_index is used to turn full addresses | |
1234 // to short indexes, if they are pre-registered by the stub mechanism. | |
1235 // If the "a" value is 0 (i.e., _target is NULL), the address is stored | |
1236 // in the code stream. See external_word_Relocation::target(). | |
1237 void pack_data_to(CodeSection* dest); | |
1238 void unpack_data(); | |
1239 | |
1240 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
1241 address target(); // if _target==NULL, fetch addr from code stream | |
1242 address value() { return target(); } | |
1243 }; | |
1244 | |
1245 class internal_word_Relocation : public DataRelocation { | |
1246 relocInfo::relocType type() { return relocInfo::internal_word_type; } | |
1247 | |
1248 public: | |
1249 static RelocationHolder spec(address target) { | |
1250 assert(target != NULL, "must not be null"); | |
1251 RelocationHolder rh = newHolder(); | |
1252 new(rh) internal_word_Relocation(target); | |
1253 return rh; | |
1254 } | |
1255 | |
1256 // use this one where all the bits of the target can fit in the code stream: | |
1257 static RelocationHolder spec_for_immediate() { | |
1258 RelocationHolder rh = newHolder(); | |
1259 new(rh) internal_word_Relocation(NULL); | |
1260 return rh; | |
1261 } | |
1262 | |
1263 internal_word_Relocation(address target) { | |
1264 _target = target; | |
1265 _section = -1; // self-relative | |
1266 } | |
1267 | |
1268 protected: | |
1269 address _target; // address in CodeBlob | |
1270 int _section; // section providing base address, if any | |
1271 | |
1272 friend class RelocIterator; | |
1273 internal_word_Relocation() { } | |
1274 | |
1275 // bit-width of LSB field in packed offset, if section >= 0 | |
1276 enum { section_width = 2 }; // must equal CodeBuffer::sect_bits | |
1277 | |
1278 public: | |
1279 // data is packed as a scaled offset in "1_int" format: [o] or [Oo] | |
1280 // If the "o" value is 0 (i.e., _target is NULL), the offset is stored | |
1281 // in the code stream. See internal_word_Relocation::target(). | |
1282 // If _section is not -1, it is appended to the low bits of the offset. | |
1283 void pack_data_to(CodeSection* dest); | |
1284 void unpack_data(); | |
1285 | |
1286 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); | |
1287 address target(); // if _target==NULL, fetch addr from code stream | |
1288 int section() { return _section; } | |
1289 address value() { return target(); } | |
1290 }; | |
1291 | |
1292 class section_word_Relocation : public internal_word_Relocation { | |
1293 relocInfo::relocType type() { return relocInfo::section_word_type; } | |
1294 | |
1295 public: | |
1296 static RelocationHolder spec(address target, int section) { | |
1297 RelocationHolder rh = newHolder(); | |
1298 new(rh) section_word_Relocation(target, section); | |
1299 return rh; | |
1300 } | |
1301 | |
1302 section_word_Relocation(address target, int section) { | |
1303 assert(target != NULL, "must not be null"); | |
1304 assert(section >= 0, "must be a valid section"); | |
1305 _target = target; | |
1306 _section = section; | |
1307 } | |
1308 | |
1309 //void pack_data_to -- inherited | |
1310 void unpack_data(); | |
1311 | |
1312 private: | |
1313 friend class RelocIterator; | |
1314 section_word_Relocation() { } | |
1315 }; | |
1316 | |
1317 | |
1318 class poll_Relocation : public Relocation { | |
1319 bool is_data() { return true; } | |
1320 relocInfo::relocType type() { return relocInfo::poll_type; } | |
304 | 1321 void fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest); |
0 | 1322 }; |
1323 | |
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1324 class poll_return_Relocation : public poll_Relocation { |
0 | 1325 relocInfo::relocType type() { return relocInfo::poll_return_type; } |
1326 }; | |
1327 | |
1328 // We know all the xxx_Relocation classes, so now we can define these: | |
1329 #define EACH_CASE(name) \ | |
1330 inline name##_Relocation* RelocIterator::name##_reloc() { \ | |
1331 assert(type() == relocInfo::name##_type, "type must agree"); \ | |
1332 /* The purpose of the placed "new" is to re-use the same */ \ | |
1333 /* stack storage for each new iteration. */ \ | |
1334 name##_Relocation* r = new(_rh) name##_Relocation(); \ | |
1335 r->set_binding(this); \ | |
1336 r->name##_Relocation::unpack_data(); \ | |
1337 return r; \ | |
1338 } | |
1339 APPLY_TO_RELOCATIONS(EACH_CASE); | |
1340 #undef EACH_CASE | |
1341 | |
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1342 inline RelocIterator::RelocIterator(nmethod* nm, address begin, address limit) { |
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1343 initialize(nm, begin, limit); |
0 | 1344 } |
1345 | |
1972 | 1346 #endif // SHARE_VM_CODE_RELOCINFO_HPP |