Mercurial > hg > truffle
annotate src/cpu/x86/vm/vtableStubs_x86_64.cpp @ 17439:e9c8742148c1
Truffle: NeverValidAssumption can be invalidated.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Tue, 14 Oct 2014 15:06:49 +0100 |
parents | 4ca6dc0799b6 |
children | 89152779163c |
rev | line source |
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0 | 1 /* |
14909 | 2 * Copyright (c) 2003, 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" |
1972 | 27 #include "code/vtableStubs.hpp" |
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28 #include "interp_masm_x86.hpp" |
1972 | 29 #include "memory/resourceArea.hpp" |
30 #include "oops/instanceKlass.hpp" | |
31 #include "oops/klassVtable.hpp" | |
32 #include "runtime/sharedRuntime.hpp" | |
33 #include "vmreg_x86.inline.hpp" | |
34 #ifdef COMPILER2 | |
35 #include "opto/runtime.hpp" | |
36 #endif | |
0 | 37 |
38 // machine-dependent part of VtableStubs: create VtableStub of correct size and | |
39 // initialize its code | |
40 | |
41 #define __ masm-> | |
42 | |
43 #ifndef PRODUCT | |
44 extern "C" void bad_compiled_vtable_index(JavaThread* thread, | |
45 oop receiver, | |
46 int index); | |
47 #endif | |
48 | |
49 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { | |
50 const int amd64_code_length = VtableStub::pd_code_size_limit(true); | |
51 VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index); | |
12294 | 52 // Can be NULL if there is no free space in the code cache. |
53 if (s == NULL) { | |
54 return NULL; | |
55 } | |
56 | |
0 | 57 ResourceMark rm; |
58 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
59 MacroAssembler* masm = new MacroAssembler(&cb); | |
60 | |
61 #ifndef PRODUCT | |
62 if (CountCompiledCalls) { | |
63 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
64 } | |
65 #endif | |
66 | |
67 // get receiver (need to skip return address on top of stack) | |
68 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
69 | |
70 // Free registers (non-args) are rax, rbx | |
71 | |
72 // get receiver klass | |
73 address npe_addr = __ pc(); | |
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74 __ load_klass(rax, j_rarg0); |
0 | 75 |
76 #ifndef PRODUCT | |
77 if (DebugVtables) { | |
78 Label L; | |
79 // check offset vs vtable length | |
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80 __ cmpl(Address(rax, InstanceKlass::vtable_length_offset() * wordSize), |
0 | 81 vtable_index * vtableEntry::size()); |
82 __ jcc(Assembler::greater, L); | |
83 __ movl(rbx, vtable_index); | |
84 __ call_VM(noreg, | |
85 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx); | |
86 __ bind(L); | |
87 } | |
88 #endif // PRODUCT | |
89 | |
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90 // load Method* and target address |
0 | 91 const Register method = rbx; |
92 | |
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93 __ lookup_virtual_method(rax, vtable_index, method); |
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94 |
0 | 95 if (DebugVtables) { |
96 Label L; | |
304 | 97 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 98 __ jcc(Assembler::equal, L); |
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99 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 100 __ jcc(Assembler::notZero, L); |
101 __ stop("Vtable entry is NULL"); | |
102 __ bind(L); | |
103 } | |
104 // rax: receiver klass | |
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105 // rbx: Method* |
0 | 106 // rcx: receiver |
107 address ame_addr = __ pc(); | |
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108 __ jmp( Address(rbx, Method::from_compiled_offset())); |
0 | 109 |
110 __ flush(); | |
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111 |
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112 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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113 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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114 vtable_index, s->entry_point(), |
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115 (int)(s->code_end() - s->entry_point()), |
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116 (int)(s->code_end() - __ pc())); |
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117 } |
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118 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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119 // shut the door on sizing bugs |
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120 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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121 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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122 |
0 | 123 s->set_exception_points(npe_addr, ame_addr); |
124 return s; | |
125 } | |
126 | |
127 | |
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128 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
0 | 129 // Note well: pd_code_size_limit is the absolute minimum we can get |
130 // away with. If you add code here, bump the code stub size | |
131 // returned by pd_code_size_limit! | |
132 const int amd64_code_length = VtableStub::pd_code_size_limit(false); | |
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133 VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index); |
12294 | 134 // Can be NULL if there is no free space in the code cache. |
135 if (s == NULL) { | |
136 return NULL; | |
137 } | |
138 | |
0 | 139 ResourceMark rm; |
140 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
141 MacroAssembler* masm = new MacroAssembler(&cb); | |
142 | |
143 #ifndef PRODUCT | |
144 if (CountCompiledCalls) { | |
145 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
146 } | |
147 #endif | |
148 | |
149 // Entry arguments: | |
150 // rax: Interface | |
151 // j_rarg0: Receiver | |
152 | |
153 // Free registers (non-args) are rax (interface), rbx | |
154 | |
155 // get receiver (need to skip return address on top of stack) | |
156 | |
157 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
158 // get receiver klass (also an implicit null-check) | |
159 address npe_addr = __ pc(); | |
160 | |
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161 // Most registers are in use; we'll use rax, rbx, r10, r11 |
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162 // (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them) |
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163 __ load_klass(r10, j_rarg0); |
0 | 164 |
165 // If we take a trap while this arg is on the stack we will not | |
166 // be able to walk the stack properly. This is not an issue except | |
167 // when there are mistakes in this assembly code that could generate | |
168 // a spurious fault. Ask me how I know... | |
169 | |
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170 const Register method = rbx; |
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171 Label throw_icce; |
0 | 172 |
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173 // Get Method* and entrypoint for compiler |
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174 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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175 r10, rax, itable_index, |
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176 // outputs: method, scan temp. reg |
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177 method, r11, |
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178 throw_icce); |
0 | 179 |
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180 // method (rbx): Method* |
0 | 181 // j_rarg0: receiver |
182 | |
183 #ifdef ASSERT | |
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184 if (DebugVtables) { |
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185 Label L2; |
304 | 186 __ cmpptr(method, (int32_t)NULL_WORD); |
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187 __ jcc(Assembler::equal, L2); |
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188 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD); |
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189 __ jcc(Assembler::notZero, L2); |
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190 __ stop("compiler entrypoint is null"); |
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191 __ bind(L2); |
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192 } |
0 | 193 #endif // ASSERT |
194 | |
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195 // rbx: Method* |
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196 // j_rarg0: receiver |
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197 address ame_addr = __ pc(); |
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198 __ jmp(Address(method, Method::from_compiled_offset())); |
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199 |
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200 __ bind(throw_icce); |
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201 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
0 | 202 |
203 __ flush(); | |
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204 |
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205 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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206 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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207 itable_index, s->entry_point(), |
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208 (int)(s->code_end() - s->entry_point()), |
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209 (int)(s->code_end() - __ pc())); |
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210 } |
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211 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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212 // shut the door on sizing bugs |
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213 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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214 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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215 |
0 | 216 s->set_exception_points(npe_addr, ame_addr); |
217 return s; | |
218 } | |
219 | |
220 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
221 if (is_vtable_stub) { | |
222 // Vtable stub size | |
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223 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) + |
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224 (UseCompressedClassPointers ? MacroAssembler::instr_size_for_decode_klass_not_null() : 0); |
0 | 225 } else { |
226 // Itable stub size | |
1783 | 227 return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) + |
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228 (UseCompressedClassPointers ? MacroAssembler::instr_size_for_decode_klass_not_null() : 0); |
0 | 229 } |
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230 // In order to tune these parameters, run the JVM with VM options |
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231 // +PrintMiscellaneous and +WizardMode to see information about |
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232 // actual itable stubs. Look for lines like this: |
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233 // itable #1 at 0x5551212[71] left over: 3 |
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234 // Reduce the constants so that the "left over" number is >=3 |
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235 // for the common cases. |
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236 // Do not aim at a left-over number of zero, because a |
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237 // large vtable or itable index (>= 32) will require a 32-bit |
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238 // immediate displacement instead of an 8-bit one. |
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239 // |
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240 // The JVM98 app. _202_jess has a megamorphic interface call. |
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241 // The itable code looks like this: |
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242 // Decoding VtableStub itbl[1]@12 |
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243 // mov 0x8(%rsi),%r10 |
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244 // mov 0x198(%r10),%r11d |
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245 // lea 0x218(%r10,%r11,8),%r11 |
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246 // lea 0x8(%r10),%r10 |
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247 // mov (%r11),%rbx |
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248 // cmp %rbx,%rax |
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249 // je success |
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250 // loop: |
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251 // test %rbx,%rbx |
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252 // je throw_icce |
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253 // add $0x10,%r11 |
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254 // mov (%r11),%rbx |
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255 // cmp %rbx,%rax |
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256 // jne loop |
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257 // success: |
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258 // mov 0x8(%r11),%r11d |
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259 // mov (%r10,%r11,1),%rbx |
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260 // jmpq *0x60(%rbx) |
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261 // throw_icce: |
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262 // jmpq throw_ICCE_entry |
0 | 263 } |
264 | |
265 int VtableStub::pd_code_alignment() { | |
266 return wordSize; | |
267 } |