Mercurial > hg > truffle
annotate src/cpu/x86/vm/vtableStubs_x86_32.cpp @ 1865:1c352af0135d
6763959: java.util.concurrent.locks.LockSupport.parkUntil(0) blocks forever
Summary: Absolute time 0 needs to return immediately.
Reviewed-by: phh, dcubed, dholmes
author | acorn |
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date | Mon, 04 Oct 2010 13:11:10 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2009, 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 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_vtableStubs_x86_32.cpp.incl" | |
27 | |
28 // machine-dependent part of VtableStubs: create VtableStub of correct size and | |
29 // initialize its code | |
30 | |
31 #define __ masm-> | |
32 | |
33 #ifndef PRODUCT | |
34 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index); | |
35 #endif | |
36 | |
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37 // These stubs are used by the compiler only. |
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38 // Argument registers, which must be preserved: |
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39 // rcx - receiver (always first argument) |
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40 // rdx - second argument (if any) |
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41 // Other registers that might be usable: |
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42 // rax - inline cache register (is interface for itable stub) |
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43 // rbx - method (used when calling out to interpreter) |
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44 // Available now, but may become callee-save at some point: |
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45 // rsi, rdi |
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46 // Note that rax and rdx are also used for return values. |
0 | 47 // |
48 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { | |
49 const int i486_code_length = VtableStub::pd_code_size_limit(true); | |
50 VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index); | |
51 ResourceMark rm; | |
52 CodeBuffer cb(s->entry_point(), i486_code_length); | |
53 MacroAssembler* masm = new MacroAssembler(&cb); | |
54 | |
55 #ifndef PRODUCT | |
56 | |
57 if (CountCompiledCalls) { | |
304 | 58 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
0 | 59 } |
60 #endif /* PRODUCT */ | |
61 | |
62 // get receiver (need to skip return address on top of stack) | |
63 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); | |
64 | |
65 // get receiver klass | |
66 address npe_addr = __ pc(); | |
304 | 67 __ movptr(rax, Address(rcx, oopDesc::klass_offset_in_bytes())); |
0 | 68 // compute entry offset (in words) |
69 int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size(); | |
70 #ifndef PRODUCT | |
71 if (DebugVtables) { | |
72 Label L; | |
73 // check offset vs vtable length | |
74 __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size()); | |
75 __ jcc(Assembler::greater, L); | |
76 __ movl(rbx, vtable_index); | |
77 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx); | |
78 __ bind(L); | |
79 } | |
80 #endif // PRODUCT | |
81 | |
82 const Register method = rbx; | |
83 | |
84 // load methodOop and target address | |
304 | 85 __ movptr(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes())); |
0 | 86 if (DebugVtables) { |
87 Label L; | |
304 | 88 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 89 __ jcc(Assembler::equal, L); |
304 | 90 __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 91 __ jcc(Assembler::notZero, L); |
92 __ stop("Vtable entry is NULL"); | |
93 __ bind(L); | |
94 } | |
95 | |
96 // rax,: receiver klass | |
97 // method (rbx): methodOop | |
98 // rcx: receiver | |
99 address ame_addr = __ pc(); | |
100 __ jmp( Address(method, methodOopDesc::from_compiled_offset())); | |
101 | |
102 masm->flush(); | |
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103 |
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104 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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105 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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106 vtable_index, s->entry_point(), |
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107 (int)(s->code_end() - s->entry_point()), |
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108 (int)(s->code_end() - __ pc())); |
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109 } |
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110 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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111 // shut the door on sizing bugs |
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112 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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113 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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114 |
0 | 115 s->set_exception_points(npe_addr, ame_addr); |
116 return s; | |
117 } | |
118 | |
119 | |
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120 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
0 | 121 // Note well: pd_code_size_limit is the absolute minimum we can get away with. If you |
122 // add code here, bump the code stub size returned by pd_code_size_limit! | |
123 const int i486_code_length = VtableStub::pd_code_size_limit(false); | |
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124 VtableStub* s = new(i486_code_length) VtableStub(false, itable_index); |
0 | 125 ResourceMark rm; |
126 CodeBuffer cb(s->entry_point(), i486_code_length); | |
127 MacroAssembler* masm = new MacroAssembler(&cb); | |
128 | |
129 // Entry arguments: | |
130 // rax,: Interface | |
131 // rcx: Receiver | |
132 | |
133 #ifndef PRODUCT | |
134 if (CountCompiledCalls) { | |
304 | 135 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
0 | 136 } |
137 #endif /* PRODUCT */ | |
138 // get receiver (need to skip return address on top of stack) | |
139 | |
140 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); | |
141 | |
142 // get receiver klass (also an implicit null-check) | |
143 address npe_addr = __ pc(); | |
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144 __ movptr(rsi, Address(rcx, oopDesc::klass_offset_in_bytes())); |
0 | 145 |
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146 // Most registers are in use; we'll use rax, rbx, rsi, rdi |
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147 // (If we need to make rsi, rdi callee-save, do a push/pop here.) |
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148 const Register method = rbx; |
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149 Label throw_icce; |
0 | 150 |
151 // Get methodOop and entrypoint for compiler | |
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152 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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153 rsi, rax, itable_index, |
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154 // outputs: method, scan temp. reg |
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155 method, rdi, |
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156 throw_icce); |
0 | 157 |
158 // method (rbx): methodOop | |
159 // rcx: receiver | |
160 | |
161 #ifdef ASSERT | |
162 if (DebugVtables) { | |
163 Label L1; | |
304 | 164 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 165 __ jcc(Assembler::equal, L1); |
304 | 166 __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 167 __ jcc(Assembler::notZero, L1); |
168 __ stop("methodOop is null"); | |
169 __ bind(L1); | |
170 } | |
171 #endif // ASSERT | |
172 | |
173 address ame_addr = __ pc(); | |
174 __ jmp(Address(method, methodOopDesc::from_compiled_offset())); | |
175 | |
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176 __ bind(throw_icce); |
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177 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
0 | 178 masm->flush(); |
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179 |
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180 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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181 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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182 itable_index, s->entry_point(), |
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183 (int)(s->code_end() - s->entry_point()), |
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184 (int)(s->code_end() - __ pc())); |
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185 } |
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186 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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187 // shut the door on sizing bugs |
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188 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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189 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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190 |
0 | 191 s->set_exception_points(npe_addr, ame_addr); |
192 return s; | |
193 } | |
194 | |
195 | |
196 | |
197 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
198 if (is_vtable_stub) { | |
199 // Vtable stub size | |
200 return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0); | |
201 } else { | |
202 // Itable stub size | |
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203 return (DebugVtables ? 256 : 66) + (CountCompiledCalls ? 6 : 0); |
0 | 204 } |
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205 // In order to tune these parameters, run the JVM with VM options |
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206 // +PrintMiscellaneous and +WizardMode to see information about |
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207 // actual itable stubs. Look for lines like this: |
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208 // itable #1 at 0x5551212[65] left over: 3 |
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209 // Reduce the constants so that the "left over" number is >=3 |
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210 // for the common cases. |
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211 // Do not aim at a left-over number of zero, because a |
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212 // large vtable or itable index (> 16) will require a 32-bit |
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213 // immediate displacement instead of an 8-bit one. |
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214 // |
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215 // The JVM98 app. _202_jess has a megamorphic interface call. |
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216 // The itable code looks like this: |
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217 // Decoding VtableStub itbl[1]@1 |
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218 // mov 0x4(%ecx),%esi |
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219 // mov 0xe8(%esi),%edi |
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220 // lea 0x130(%esi,%edi,4),%edi |
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221 // add $0x7,%edi |
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222 // and $0xfffffff8,%edi |
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223 // lea 0x4(%esi),%esi |
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224 // mov (%edi),%ebx |
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225 // cmp %ebx,%eax |
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226 // je success |
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227 // loop: |
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228 // test %ebx,%ebx |
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229 // je throw_icce |
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230 // add $0x8,%edi |
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231 // mov (%edi),%ebx |
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232 // cmp %ebx,%eax |
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233 // jne loop |
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234 // success: |
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235 // mov 0x4(%edi),%edi |
1d037ecd7960
6827505: sizing logic for vtable and itable stubs needs self-check
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236 // mov (%esi,%edi,1),%ebx |
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6827505: sizing logic for vtable and itable stubs needs self-check
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237 // jmp *0x44(%ebx) |
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238 // throw_icce: |
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6827505: sizing logic for vtable and itable stubs needs self-check
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239 // jmp throw_ICCE_entry |
0 | 240 } |
241 | |
242 int VtableStub::pd_code_alignment() { | |
243 return wordSize; | |
244 } |