Mercurial > hg > graal-compiler
annotate src/share/vm/asm/assembler.cpp @ 9809:a8a5d5832def
first step towards extensibility of the escape analysis phase
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 17 May 2013 16:47:13 +0200 |
parents | a5de0cc2f91c |
children | 746b070f5022 |
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 void AbstractAssembler::bind(Label& L) { | |
113 if (L.is_bound()) { | |
114 // Assembler can bind a label more than once to the same place. | |
115 guarantee(L.loc() == locator(), "attempt to redefine label"); | |
116 return; | |
117 } | |
118 L.bind_loc(locator()); | |
119 L.patch_instructions((MacroAssembler*)this); | |
120 } | |
121 | |
122 void AbstractAssembler::generate_stack_overflow_check( int frame_size_in_bytes) { | |
123 if (UseStackBanging) { | |
124 // Each code entry causes one stack bang n pages down the stack where n | |
125 // is configurable by StackBangPages. The setting depends on the maximum | |
126 // depth of VM call stack or native before going back into java code, | |
127 // since only java code can raise a stack overflow exception using the | |
128 // stack banging mechanism. The VM and native code does not detect stack | |
129 // overflow. | |
130 // The code in JavaCalls::call() checks that there is at least n pages | |
131 // available, so all entry code needs to do is bang once for the end of | |
132 // this shadow zone. | |
133 // The entry code may need to bang additional pages if the framesize | |
134 // is greater than a page. | |
135 | |
136 const int page_size = os::vm_page_size(); | |
137 int bang_end = StackShadowPages*page_size; | |
138 | |
139 // This is how far the previous frame's stack banging extended. | |
140 const int bang_end_safe = bang_end; | |
141 | |
142 if (frame_size_in_bytes > page_size) { | |
143 bang_end += frame_size_in_bytes; | |
144 } | |
145 | |
146 int bang_offset = bang_end_safe; | |
147 while (bang_offset <= bang_end) { | |
148 // Need at least one stack bang at end of shadow zone. | |
149 bang_stack_with_offset(bang_offset); | |
150 bang_offset += page_size; | |
151 } | |
152 } // end (UseStackBanging) | |
153 } | |
154 | |
155 void Label::add_patch_at(CodeBuffer* cb, int branch_loc) { | |
156 assert(_loc == -1, "Label is unbound"); | |
157 if (_patch_index < PatchCacheSize) { | |
158 _patches[_patch_index] = branch_loc; | |
159 } else { | |
160 if (_patch_overflow == NULL) { | |
161 _patch_overflow = cb->create_patch_overflow(); | |
162 } | |
163 _patch_overflow->push(branch_loc); | |
164 } | |
165 ++_patch_index; | |
166 } | |
167 | |
168 void Label::patch_instructions(MacroAssembler* masm) { | |
169 assert(is_bound(), "Label is bound"); | |
170 CodeBuffer* cb = masm->code(); | |
171 int target_sect = CodeBuffer::locator_sect(loc()); | |
172 address target = cb->locator_address(loc()); | |
173 while (_patch_index > 0) { | |
174 --_patch_index; | |
175 int branch_loc; | |
176 if (_patch_index >= PatchCacheSize) { | |
177 branch_loc = _patch_overflow->pop(); | |
178 } else { | |
179 branch_loc = _patches[_patch_index]; | |
180 } | |
181 int branch_sect = CodeBuffer::locator_sect(branch_loc); | |
182 address branch = cb->locator_address(branch_loc); | |
183 if (branch_sect == CodeBuffer::SECT_CONSTS) { | |
184 // The thing to patch is a constant word. | |
185 *(address*)branch = target; | |
186 continue; | |
187 } | |
188 | |
189 #ifdef ASSERT | |
190 // Cross-section branches only work if the | |
191 // intermediate section boundaries are frozen. | |
192 if (target_sect != branch_sect) { | |
193 for (int n = MIN2(target_sect, branch_sect), | |
194 nlimit = (target_sect + branch_sect) - n; | |
195 n < nlimit; n++) { | |
196 CodeSection* cs = cb->code_section(n); | |
197 assert(cs->is_frozen(), "cross-section branch needs stable offsets"); | |
198 } | |
199 } | |
200 #endif //ASSERT | |
201 | |
202 // Push the target offset into the branch instruction. | |
203 masm->pd_patch_instruction(branch, target); | |
204 } | |
205 } | |
206 | |
622
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207 struct DelayedConstant { |
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208 typedef void (*value_fn_t)(); |
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209 BasicType type; |
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210 intptr_t value; |
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211 value_fn_t value_fn; |
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212 // This limit of 20 is generous for initial uses. |
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213 // The limit needs to be large enough to store the field offsets |
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214 // into classes which do not have statically fixed layouts. |
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215 // (Initial use is for method handle object offsets.) |
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216 // Look for uses of "delayed_value" in the source code |
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217 // and make sure this number is generous enough to handle all of them. |
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218 enum { DC_LIMIT = 20 }; |
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219 static DelayedConstant delayed_constants[DC_LIMIT]; |
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220 static DelayedConstant* add(BasicType type, value_fn_t value_fn); |
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221 bool match(BasicType t, value_fn_t cfn) { |
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222 return type == t && value_fn == cfn; |
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223 } |
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224 static void update_all(); |
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225 }; |
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226 |
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227 DelayedConstant DelayedConstant::delayed_constants[DC_LIMIT]; |
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228 // Default C structure initialization rules have the following effect here: |
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229 // = { { (BasicType)0, (intptr_t)NULL }, ... }; |
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230 |
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231 DelayedConstant* DelayedConstant::add(BasicType type, |
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232 DelayedConstant::value_fn_t cfn) { |
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233 for (int i = 0; i < DC_LIMIT; i++) { |
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234 DelayedConstant* dcon = &delayed_constants[i]; |
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235 if (dcon->match(type, cfn)) |
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236 return dcon; |
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237 if (dcon->value_fn == NULL) { |
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238 // (cmpxchg not because this is multi-threaded but because I'm paranoid) |
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239 if (Atomic::cmpxchg_ptr(CAST_FROM_FN_PTR(void*, cfn), &dcon->value_fn, NULL) == NULL) { |
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240 dcon->type = type; |
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241 return dcon; |
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242 } |
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243 } |
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244 } |
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245 // If this assert is hit (in pre-integration testing!) then re-evaluate |
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246 // the comment on the definition of DC_LIMIT. |
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247 guarantee(false, "too many delayed constants"); |
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248 return NULL; |
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249 } |
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250 |
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251 void DelayedConstant::update_all() { |
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252 for (int i = 0; i < DC_LIMIT; i++) { |
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253 DelayedConstant* dcon = &delayed_constants[i]; |
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254 if (dcon->value_fn != NULL && dcon->value == 0) { |
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255 typedef int (*int_fn_t)(); |
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256 typedef address (*address_fn_t)(); |
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257 switch (dcon->type) { |
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258 case T_INT: dcon->value = (intptr_t) ((int_fn_t) dcon->value_fn)(); break; |
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259 case T_ADDRESS: dcon->value = (intptr_t) ((address_fn_t)dcon->value_fn)(); break; |
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260 } |
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261 } |
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262 } |
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263 } |
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264 |
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265 RegisterOrConstant AbstractAssembler::delayed_value(int(*value_fn)(), Register tmp, int offset) { |
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266 intptr_t val = (intptr_t) (*value_fn)(); |
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267 if (val != 0) return val + offset; |
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268 return delayed_value_impl(delayed_value_addr(value_fn), tmp, offset); |
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269 } |
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270 RegisterOrConstant AbstractAssembler::delayed_value(address(*value_fn)(), Register tmp, int offset) { |
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271 intptr_t val = (intptr_t) (*value_fn)(); |
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272 if (val != 0) return val + offset; |
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273 return delayed_value_impl(delayed_value_addr(value_fn), tmp, offset); |
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274 } |
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275 intptr_t* AbstractAssembler::delayed_value_addr(int(*value_fn)()) { |
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276 DelayedConstant* dcon = DelayedConstant::add(T_INT, (DelayedConstant::value_fn_t) value_fn); |
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277 return &dcon->value; |
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278 } |
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279 intptr_t* AbstractAssembler::delayed_value_addr(address(*value_fn)()) { |
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280 DelayedConstant* dcon = DelayedConstant::add(T_ADDRESS, (DelayedConstant::value_fn_t) value_fn); |
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281 return &dcon->value; |
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282 } |
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283 void AbstractAssembler::update_delayed_values() { |
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284 DelayedConstant::update_all(); |
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285 } |
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286 |
0 | 287 void AbstractAssembler::block_comment(const char* comment) { |
288 if (sect() == CodeBuffer::SECT_INSTS) { | |
289 code_section()->outer()->block_comment(offset(), comment); | |
290 } | |
291 } | |
292 | |
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293 const char* AbstractAssembler::code_string(const char* str) { |
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294 if (sect() == CodeBuffer::SECT_INSTS || sect() == CodeBuffer::SECT_STUBS) { |
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295 return code_section()->outer()->code_string(str); |
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296 } |
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297 return NULL; |
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298 } |
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299 |
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300 bool MacroAssembler::needs_explicit_null_check(intptr_t offset) { |
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301 // Exception handler checks the nmethod's implicit null checks table |
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302 // only when this method returns false. |
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303 #ifdef _LP64 |
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304 if (UseCompressedOops && Universe::narrow_oop_base() != NULL) { |
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305 assert (Universe::heap() != NULL, "java heap should be initialized"); |
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306 // The first page after heap_base is unmapped and |
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307 // the 'offset' is equal to [heap_base + offset] for |
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308 // narrow oop implicit null checks. |
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309 uintptr_t base = (uintptr_t)Universe::narrow_oop_base(); |
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310 if ((uintptr_t)offset >= base) { |
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311 // Normalize offset for the next check. |
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312 offset = (intptr_t)(pointer_delta((void*)offset, (void*)base, 1)); |
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313 } |
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314 } |
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315 #endif |
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316 return offset < 0 || os::vm_page_size() <= offset; |
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317 } |