Mercurial > hg > truffle
annotate src/share/vm/asm/assembler.cpp @ 7287:76c9023ed438
Remove now useless prefix arguments for jtt unittests
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 20 Dec 2012 17:06:59 +0100 |
parents | cd3d6a6b95d9 |
children | 18d56ca3e901 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
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26 #include "asm/macroAssembler.hpp" |
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27 #include "asm/macroAssembler.inline.hpp" |
1972 | 28 #include "asm/codeBuffer.hpp" |
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29 #include "runtime/atomic.hpp" |
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30 #include "runtime/atomic.inline.hpp" |
1972 | 31 #include "runtime/icache.hpp" |
32 #include "runtime/os.hpp" | |
0 | 33 |
34 | |
35 // Implementation of AbstractAssembler | |
36 // | |
37 // The AbstractAssembler is generating code into a CodeBuffer. To make code generation faster, | |
38 // the assembler keeps a copy of the code buffers boundaries & modifies them when | |
39 // emitting bytes rather than using the code buffers accessor functions all the time. | |
605 | 40 // The code buffer is updated via set_code_end(...) after emitting a whole instruction. |
0 | 41 |
42 AbstractAssembler::AbstractAssembler(CodeBuffer* code) { | |
43 if (code == NULL) return; | |
44 CodeSection* cs = code->insts(); | |
45 cs->clear_mark(); // new assembler kills old mark | |
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46 if (cs->start() == NULL) { |
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47 vm_exit_out_of_memory(0, err_msg("CodeCache: no room for %s", |
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48 code->name())); |
0 | 49 } |
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50 _code_section = cs; |
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51 _oop_recorder= code->oop_recorder(); |
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52 DEBUG_ONLY( _short_branch_delta = 0; ) |
0 | 53 } |
54 | |
55 void AbstractAssembler::set_code_section(CodeSection* cs) { | |
56 assert(cs->outer() == code_section()->outer(), "sanity"); | |
57 assert(cs->is_allocated(), "need to pre-allocate this section"); | |
58 cs->clear_mark(); // new assembly into this section kills old mark | |
59 _code_section = cs; | |
60 } | |
61 | |
62 // Inform CodeBuffer that incoming code and relocation will be for stubs | |
63 address AbstractAssembler::start_a_stub(int required_space) { | |
64 CodeBuffer* cb = code(); | |
65 CodeSection* cs = cb->stubs(); | |
66 assert(_code_section == cb->insts(), "not in insts?"); | |
67 if (cs->maybe_expand_to_ensure_remaining(required_space) | |
68 && cb->blob() == NULL) { | |
69 return NULL; | |
70 } | |
71 set_code_section(cs); | |
72 return pc(); | |
73 } | |
74 | |
75 // Inform CodeBuffer that incoming code and relocation will be code | |
76 // Should not be called if start_a_stub() returned NULL | |
77 void AbstractAssembler::end_a_stub() { | |
78 assert(_code_section == code()->stubs(), "not in stubs?"); | |
79 set_code_section(code()->insts()); | |
80 } | |
81 | |
82 // Inform CodeBuffer that incoming code and relocation will be for stubs | |
83 address AbstractAssembler::start_a_const(int required_space, int required_align) { | |
84 CodeBuffer* cb = code(); | |
85 CodeSection* cs = cb->consts(); | |
7197 | 86 assert(_code_section == cb->insts() || _code_section == cb->stubs(), "not in insts/stubs?"); |
0 | 87 address end = cs->end(); |
88 int pad = -(intptr_t)end & (required_align-1); | |
89 if (cs->maybe_expand_to_ensure_remaining(pad + required_space)) { | |
90 if (cb->blob() == NULL) return NULL; | |
91 end = cs->end(); // refresh pointer | |
92 } | |
93 if (pad > 0) { | |
94 while (--pad >= 0) { *end++ = 0; } | |
95 cs->set_end(end); | |
96 } | |
97 set_code_section(cs); | |
98 return end; | |
99 } | |
100 | |
101 // Inform CodeBuffer that incoming code and relocation will be code | |
7197 | 102 // in section cs (insts or stubs). |
103 void AbstractAssembler::end_a_const(CodeSection* cs) { | |
0 | 104 assert(_code_section == code()->consts(), "not in consts?"); |
7197 | 105 set_code_section(cs); |
0 | 106 } |
107 | |
108 void AbstractAssembler::flush() { | |
109 ICache::invalidate_range(addr_at(0), offset()); | |
110 } | |
111 | |
112 | |
113 void AbstractAssembler::a_byte(int x) { | |
114 emit_byte(x); | |
115 } | |
116 | |
117 | |
118 void AbstractAssembler::a_long(jint x) { | |
119 emit_long(x); | |
120 } | |
121 | |
122 // Labels refer to positions in the (to be) generated code. There are bound | |
123 // and unbound | |
124 // | |
125 // Bound labels refer to known positions in the already generated code. | |
126 // offset() is the position the label refers to. | |
127 // | |
128 // Unbound labels refer to unknown positions in the code to be generated; it | |
129 // may contain a list of unresolved displacements that refer to it | |
130 #ifndef PRODUCT | |
131 void AbstractAssembler::print(Label& L) { | |
132 if (L.is_bound()) { | |
133 tty->print_cr("bound label to %d|%d", L.loc_pos(), L.loc_sect()); | |
134 } else if (L.is_unbound()) { | |
135 L.print_instructions((MacroAssembler*)this); | |
136 } else { | |
137 tty->print_cr("label in inconsistent state (loc = %d)", L.loc()); | |
138 } | |
139 } | |
140 #endif // PRODUCT | |
141 | |
142 | |
143 void AbstractAssembler::bind(Label& L) { | |
144 if (L.is_bound()) { | |
145 // Assembler can bind a label more than once to the same place. | |
146 guarantee(L.loc() == locator(), "attempt to redefine label"); | |
147 return; | |
148 } | |
149 L.bind_loc(locator()); | |
150 L.patch_instructions((MacroAssembler*)this); | |
151 } | |
152 | |
153 void AbstractAssembler::generate_stack_overflow_check( int frame_size_in_bytes) { | |
154 if (UseStackBanging) { | |
155 // Each code entry causes one stack bang n pages down the stack where n | |
156 // is configurable by StackBangPages. The setting depends on the maximum | |
157 // depth of VM call stack or native before going back into java code, | |
158 // since only java code can raise a stack overflow exception using the | |
159 // stack banging mechanism. The VM and native code does not detect stack | |
160 // overflow. | |
161 // The code in JavaCalls::call() checks that there is at least n pages | |
162 // available, so all entry code needs to do is bang once for the end of | |
163 // this shadow zone. | |
164 // The entry code may need to bang additional pages if the framesize | |
165 // is greater than a page. | |
166 | |
167 const int page_size = os::vm_page_size(); | |
168 int bang_end = StackShadowPages*page_size; | |
169 | |
170 // This is how far the previous frame's stack banging extended. | |
171 const int bang_end_safe = bang_end; | |
172 | |
173 if (frame_size_in_bytes > page_size) { | |
174 bang_end += frame_size_in_bytes; | |
175 } | |
176 | |
177 int bang_offset = bang_end_safe; | |
178 while (bang_offset <= bang_end) { | |
179 // Need at least one stack bang at end of shadow zone. | |
180 bang_stack_with_offset(bang_offset); | |
181 bang_offset += page_size; | |
182 } | |
183 } // end (UseStackBanging) | |
184 } | |
185 | |
186 void Label::add_patch_at(CodeBuffer* cb, int branch_loc) { | |
187 assert(_loc == -1, "Label is unbound"); | |
188 if (_patch_index < PatchCacheSize) { | |
189 _patches[_patch_index] = branch_loc; | |
190 } else { | |
191 if (_patch_overflow == NULL) { | |
192 _patch_overflow = cb->create_patch_overflow(); | |
193 } | |
194 _patch_overflow->push(branch_loc); | |
195 } | |
196 ++_patch_index; | |
197 } | |
198 | |
199 void Label::patch_instructions(MacroAssembler* masm) { | |
200 assert(is_bound(), "Label is bound"); | |
201 CodeBuffer* cb = masm->code(); | |
202 int target_sect = CodeBuffer::locator_sect(loc()); | |
203 address target = cb->locator_address(loc()); | |
204 while (_patch_index > 0) { | |
205 --_patch_index; | |
206 int branch_loc; | |
207 if (_patch_index >= PatchCacheSize) { | |
208 branch_loc = _patch_overflow->pop(); | |
209 } else { | |
210 branch_loc = _patches[_patch_index]; | |
211 } | |
212 int branch_sect = CodeBuffer::locator_sect(branch_loc); | |
213 address branch = cb->locator_address(branch_loc); | |
214 if (branch_sect == CodeBuffer::SECT_CONSTS) { | |
215 // The thing to patch is a constant word. | |
216 *(address*)branch = target; | |
217 continue; | |
218 } | |
219 | |
220 #ifdef ASSERT | |
221 // Cross-section branches only work if the | |
222 // intermediate section boundaries are frozen. | |
223 if (target_sect != branch_sect) { | |
224 for (int n = MIN2(target_sect, branch_sect), | |
225 nlimit = (target_sect + branch_sect) - n; | |
226 n < nlimit; n++) { | |
227 CodeSection* cs = cb->code_section(n); | |
228 assert(cs->is_frozen(), "cross-section branch needs stable offsets"); | |
229 } | |
230 } | |
231 #endif //ASSERT | |
232 | |
233 // Push the target offset into the branch instruction. | |
234 masm->pd_patch_instruction(branch, target); | |
235 } | |
236 } | |
237 | |
622
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238 struct DelayedConstant { |
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239 typedef void (*value_fn_t)(); |
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240 BasicType type; |
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241 intptr_t value; |
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242 value_fn_t value_fn; |
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243 // This limit of 20 is generous for initial uses. |
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244 // The limit needs to be large enough to store the field offsets |
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245 // into classes which do not have statically fixed layouts. |
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246 // (Initial use is for method handle object offsets.) |
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247 // Look for uses of "delayed_value" in the source code |
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248 // and make sure this number is generous enough to handle all of them. |
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249 enum { DC_LIMIT = 20 }; |
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250 static DelayedConstant delayed_constants[DC_LIMIT]; |
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251 static DelayedConstant* add(BasicType type, value_fn_t value_fn); |
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252 bool match(BasicType t, value_fn_t cfn) { |
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253 return type == t && value_fn == cfn; |
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254 } |
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255 static void update_all(); |
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256 }; |
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257 |
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258 DelayedConstant DelayedConstant::delayed_constants[DC_LIMIT]; |
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259 // Default C structure initialization rules have the following effect here: |
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260 // = { { (BasicType)0, (intptr_t)NULL }, ... }; |
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261 |
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262 DelayedConstant* DelayedConstant::add(BasicType type, |
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263 DelayedConstant::value_fn_t cfn) { |
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264 for (int i = 0; i < DC_LIMIT; i++) { |
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265 DelayedConstant* dcon = &delayed_constants[i]; |
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266 if (dcon->match(type, cfn)) |
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267 return dcon; |
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268 if (dcon->value_fn == NULL) { |
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269 // (cmpxchg not because this is multi-threaded but because I'm paranoid) |
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270 if (Atomic::cmpxchg_ptr(CAST_FROM_FN_PTR(void*, cfn), &dcon->value_fn, NULL) == NULL) { |
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271 dcon->type = type; |
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272 return dcon; |
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273 } |
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274 } |
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275 } |
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276 // If this assert is hit (in pre-integration testing!) then re-evaluate |
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277 // the comment on the definition of DC_LIMIT. |
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278 guarantee(false, "too many delayed constants"); |
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279 return NULL; |
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280 } |
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281 |
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282 void DelayedConstant::update_all() { |
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283 for (int i = 0; i < DC_LIMIT; i++) { |
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284 DelayedConstant* dcon = &delayed_constants[i]; |
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285 if (dcon->value_fn != NULL && dcon->value == 0) { |
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286 typedef int (*int_fn_t)(); |
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287 typedef address (*address_fn_t)(); |
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288 switch (dcon->type) { |
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289 case T_INT: dcon->value = (intptr_t) ((int_fn_t) dcon->value_fn)(); break; |
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290 case T_ADDRESS: dcon->value = (intptr_t) ((address_fn_t)dcon->value_fn)(); break; |
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291 } |
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292 } |
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293 } |
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294 } |
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295 |
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296 RegisterOrConstant AbstractAssembler::delayed_value(int(*value_fn)(), Register tmp, int offset) { |
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297 intptr_t val = (intptr_t) (*value_fn)(); |
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298 if (val != 0) return val + offset; |
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299 return delayed_value_impl(delayed_value_addr(value_fn), tmp, offset); |
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300 } |
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301 RegisterOrConstant AbstractAssembler::delayed_value(address(*value_fn)(), Register tmp, int offset) { |
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302 intptr_t val = (intptr_t) (*value_fn)(); |
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303 if (val != 0) return val + offset; |
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304 return delayed_value_impl(delayed_value_addr(value_fn), tmp, offset); |
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305 } |
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306 intptr_t* AbstractAssembler::delayed_value_addr(int(*value_fn)()) { |
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307 DelayedConstant* dcon = DelayedConstant::add(T_INT, (DelayedConstant::value_fn_t) value_fn); |
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308 return &dcon->value; |
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309 } |
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310 intptr_t* AbstractAssembler::delayed_value_addr(address(*value_fn)()) { |
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311 DelayedConstant* dcon = DelayedConstant::add(T_ADDRESS, (DelayedConstant::value_fn_t) value_fn); |
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312 return &dcon->value; |
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313 } |
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314 void AbstractAssembler::update_delayed_values() { |
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315 DelayedConstant::update_all(); |
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316 } |
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317 |
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318 |
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319 |
0 | 320 |
321 void AbstractAssembler::block_comment(const char* comment) { | |
322 if (sect() == CodeBuffer::SECT_INSTS) { | |
323 code_section()->outer()->block_comment(offset(), comment); | |
324 } | |
325 } | |
326 | |
237
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327 bool MacroAssembler::needs_explicit_null_check(intptr_t offset) { |
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328 // Exception handler checks the nmethod's implicit null checks table |
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329 // only when this method returns false. |
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330 #ifdef _LP64 |
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331 if (UseCompressedOops && Universe::narrow_oop_base() != NULL) { |
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332 assert (Universe::heap() != NULL, "java heap should be initialized"); |
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333 // The first page after heap_base is unmapped and |
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334 // the 'offset' is equal to [heap_base + offset] for |
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335 // narrow oop implicit null checks. |
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336 uintptr_t base = (uintptr_t)Universe::narrow_oop_base(); |
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337 if ((uintptr_t)offset >= base) { |
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338 // Normalize offset for the next check. |
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339 offset = (intptr_t)(pointer_delta((void*)offset, (void*)base, 1)); |
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340 } |
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341 } |
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342 #endif |
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343 return offset < 0 || os::vm_page_size() <= offset; |
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344 } |
0 | 345 |
346 #ifndef PRODUCT | |
347 void Label::print_instructions(MacroAssembler* masm) const { | |
348 CodeBuffer* cb = masm->code(); | |
349 for (int i = 0; i < _patch_index; ++i) { | |
350 int branch_loc; | |
351 if (i >= PatchCacheSize) { | |
352 branch_loc = _patch_overflow->at(i - PatchCacheSize); | |
353 } else { | |
354 branch_loc = _patches[i]; | |
355 } | |
356 int branch_pos = CodeBuffer::locator_pos(branch_loc); | |
357 int branch_sect = CodeBuffer::locator_sect(branch_loc); | |
358 address branch = cb->locator_address(branch_loc); | |
359 tty->print_cr("unbound label"); | |
360 tty->print("@ %d|%d ", branch_pos, branch_sect); | |
361 if (branch_sect == CodeBuffer::SECT_CONSTS) { | |
362 tty->print_cr(PTR_FORMAT, *(address*)branch); | |
363 continue; | |
364 } | |
365 masm->pd_print_patched_instruction(branch); | |
366 tty->cr(); | |
367 } | |
368 } | |
369 #endif // ndef PRODUCT |