Mercurial > hg > truffle
annotate src/cpu/x86/vm/vtableStubs_x86_32.cpp @ 8082:9e2da96f9976
Merge
author | bpittore |
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date | Fri, 08 Feb 2013 16:08:17 -0500 |
parents | cd3d6a6b95d9 |
children | 891687731b59 |
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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" |
1972 | 27 #include "code/vtableStubs.hpp" |
28 #include "interp_masm_x86_32.hpp" | |
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, oop receiver, int index); | |
45 #endif | |
46 | |
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47 // These stubs are used by the compiler only. |
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48 // Argument registers, which must be preserved: |
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49 // rcx - receiver (always first argument) |
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50 // rdx - second argument (if any) |
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51 // Other registers that might be usable: |
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52 // rax - inline cache register (is interface for itable stub) |
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53 // rbx - method (used when calling out to interpreter) |
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54 // Available now, but may become callee-save at some point: |
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55 // rsi, rdi |
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56 // Note that rax and rdx are also used for return values. |
0 | 57 // |
58 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { | |
59 const int i486_code_length = VtableStub::pd_code_size_limit(true); | |
60 VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index); | |
61 ResourceMark rm; | |
62 CodeBuffer cb(s->entry_point(), i486_code_length); | |
63 MacroAssembler* masm = new MacroAssembler(&cb); | |
64 | |
65 #ifndef PRODUCT | |
66 | |
67 if (CountCompiledCalls) { | |
304 | 68 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
0 | 69 } |
70 #endif /* PRODUCT */ | |
71 | |
72 // get receiver (need to skip return address on top of stack) | |
73 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); | |
74 | |
75 // get receiver klass | |
76 address npe_addr = __ pc(); | |
304 | 77 __ movptr(rax, Address(rcx, oopDesc::klass_offset_in_bytes())); |
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78 |
0 | 79 #ifndef PRODUCT |
80 if (DebugVtables) { | |
81 Label L; | |
82 // check offset vs vtable length | |
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83 __ cmpl(Address(rax, InstanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size()); |
0 | 84 __ jcc(Assembler::greater, L); |
85 __ movl(rbx, vtable_index); | |
86 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx); | |
87 __ bind(L); | |
88 } | |
89 #endif // PRODUCT | |
90 | |
91 const Register method = rbx; | |
92 | |
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93 // load Method* and target address |
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94 __ lookup_virtual_method(rax, vtable_index, method); |
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95 |
0 | 96 if (DebugVtables) { |
97 Label L; | |
304 | 98 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 99 __ jcc(Assembler::equal, L); |
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100 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 101 __ jcc(Assembler::notZero, L); |
102 __ stop("Vtable entry is NULL"); | |
103 __ bind(L); | |
104 } | |
105 | |
106 // rax,: receiver klass | |
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107 // method (rbx): Method* |
0 | 108 // rcx: receiver |
109 address ame_addr = __ pc(); | |
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110 __ jmp( Address(method, Method::from_compiled_offset())); |
0 | 111 |
112 masm->flush(); | |
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113 |
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114 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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115 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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116 vtable_index, s->entry_point(), |
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117 (int)(s->code_end() - s->entry_point()), |
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118 (int)(s->code_end() - __ pc())); |
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119 } |
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120 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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121 // shut the door on sizing bugs |
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122 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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123 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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124 |
0 | 125 s->set_exception_points(npe_addr, ame_addr); |
126 return s; | |
127 } | |
128 | |
129 | |
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130 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
0 | 131 // Note well: pd_code_size_limit is the absolute minimum we can get away with. If you |
132 // add code here, bump the code stub size returned by pd_code_size_limit! | |
133 const int i486_code_length = VtableStub::pd_code_size_limit(false); | |
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134 VtableStub* s = new(i486_code_length) VtableStub(false, itable_index); |
0 | 135 ResourceMark rm; |
136 CodeBuffer cb(s->entry_point(), i486_code_length); | |
137 MacroAssembler* masm = new MacroAssembler(&cb); | |
138 | |
139 // Entry arguments: | |
140 // rax,: Interface | |
141 // rcx: Receiver | |
142 | |
143 #ifndef PRODUCT | |
144 if (CountCompiledCalls) { | |
304 | 145 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
0 | 146 } |
147 #endif /* PRODUCT */ | |
148 // get receiver (need to skip return address on top of stack) | |
149 | |
150 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); | |
151 | |
152 // get receiver klass (also an implicit null-check) | |
153 address npe_addr = __ pc(); | |
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154 __ movptr(rsi, Address(rcx, oopDesc::klass_offset_in_bytes())); |
0 | 155 |
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156 // Most registers are in use; we'll use rax, rbx, rsi, rdi |
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157 // (If we need to make rsi, rdi callee-save, do a push/pop here.) |
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158 const Register method = rbx; |
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159 Label throw_icce; |
0 | 160 |
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161 // Get Method* and entrypoint for compiler |
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162 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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163 rsi, rax, itable_index, |
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164 // outputs: method, scan temp. reg |
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165 method, rdi, |
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166 throw_icce); |
0 | 167 |
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168 // method (rbx): Method* |
0 | 169 // rcx: receiver |
170 | |
171 #ifdef ASSERT | |
172 if (DebugVtables) { | |
173 Label L1; | |
304 | 174 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 175 __ jcc(Assembler::equal, L1); |
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176 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 177 __ jcc(Assembler::notZero, L1); |
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178 __ stop("Method* is null"); |
0 | 179 __ bind(L1); |
180 } | |
181 #endif // ASSERT | |
182 | |
183 address ame_addr = __ pc(); | |
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184 __ jmp(Address(method, Method::from_compiled_offset())); |
0 | 185 |
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186 __ bind(throw_icce); |
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187 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
0 | 188 masm->flush(); |
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189 |
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190 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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191 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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192 itable_index, s->entry_point(), |
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193 (int)(s->code_end() - s->entry_point()), |
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194 (int)(s->code_end() - __ pc())); |
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195 } |
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196 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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197 // shut the door on sizing bugs |
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198 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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199 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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200 |
0 | 201 s->set_exception_points(npe_addr, ame_addr); |
202 return s; | |
203 } | |
204 | |
205 | |
206 | |
207 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
208 if (is_vtable_stub) { | |
209 // Vtable stub size | |
210 return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0); | |
211 } else { | |
212 // Itable stub size | |
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213 return (DebugVtables ? 256 : 66) + (CountCompiledCalls ? 6 : 0); |
0 | 214 } |
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215 // In order to tune these parameters, run the JVM with VM options |
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216 // +PrintMiscellaneous and +WizardMode to see information about |
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217 // actual itable stubs. Look for lines like this: |
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218 // itable #1 at 0x5551212[65] left over: 3 |
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219 // Reduce the constants so that the "left over" number is >=3 |
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220 // for the common cases. |
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221 // Do not aim at a left-over number of zero, because a |
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222 // large vtable or itable index (> 16) will require a 32-bit |
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223 // immediate displacement instead of an 8-bit one. |
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224 // |
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225 // The JVM98 app. _202_jess has a megamorphic interface call. |
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226 // The itable code looks like this: |
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227 // Decoding VtableStub itbl[1]@1 |
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228 // mov 0x4(%ecx),%esi |
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229 // mov 0xe8(%esi),%edi |
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230 // lea 0x130(%esi,%edi,4),%edi |
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231 // add $0x7,%edi |
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232 // and $0xfffffff8,%edi |
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233 // lea 0x4(%esi),%esi |
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234 // mov (%edi),%ebx |
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235 // cmp %ebx,%eax |
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236 // je success |
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237 // loop: |
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238 // test %ebx,%ebx |
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239 // je throw_icce |
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240 // add $0x8,%edi |
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241 // mov (%edi),%ebx |
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242 // cmp %ebx,%eax |
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243 // jne loop |
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244 // success: |
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245 // mov 0x4(%edi),%edi |
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246 // mov (%esi,%edi,1),%ebx |
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247 // jmp *0x44(%ebx) |
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248 // throw_icce: |
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249 // jmp throw_ICCE_entry |
0 | 250 } |
251 | |
252 int VtableStub::pd_code_alignment() { | |
253 return wordSize; | |
254 } |