Mercurial > hg > truffle
annotate src/cpu/x86/vm/vtableStubs_x86_32.cpp @ 6438:bbf47e2d519f
Allow calls without a FrameState in the backend
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Tue, 25 Sep 2012 09:20:18 -0700 |
parents | 1d7922586cf6 |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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 * | |
1552
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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" |
26 #include "asm/assembler.hpp" | |
27 #include "assembler_x86.inline.hpp" | |
28 #include "code/vtableStubs.hpp" | |
29 #include "interp_masm_x86_32.hpp" | |
30 #include "memory/resourceArea.hpp" | |
31 #include "oops/instanceKlass.hpp" | |
32 #include "oops/klassVtable.hpp" | |
33 #include "runtime/sharedRuntime.hpp" | |
34 #include "vmreg_x86.inline.hpp" | |
35 #ifdef COMPILER2 | |
36 #include "opto/runtime.hpp" | |
37 #endif | |
0 | 38 |
39 // machine-dependent part of VtableStubs: create VtableStub of correct size and | |
40 // initialize its code | |
41 | |
42 #define __ masm-> | |
43 | |
44 #ifndef PRODUCT | |
45 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index); | |
46 #endif | |
47 | |
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48 // These stubs are used by the compiler only. |
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49 // Argument registers, which must be preserved: |
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50 // rcx - receiver (always first argument) |
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51 // rdx - second argument (if any) |
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52 // Other registers that might be usable: |
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53 // rax - inline cache register (is interface for itable stub) |
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54 // rbx - method (used when calling out to interpreter) |
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55 // Available now, but may become callee-save at some point: |
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56 // rsi, rdi |
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57 // Note that rax and rdx are also used for return values. |
0 | 58 // |
59 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { | |
60 const int i486_code_length = VtableStub::pd_code_size_limit(true); | |
61 VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index); | |
62 ResourceMark rm; | |
63 CodeBuffer cb(s->entry_point(), i486_code_length); | |
64 MacroAssembler* masm = new MacroAssembler(&cb); | |
65 | |
66 #ifndef PRODUCT | |
67 | |
68 if (CountCompiledCalls) { | |
304 | 69 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
0 | 70 } |
71 #endif /* PRODUCT */ | |
72 | |
73 // get receiver (need to skip return address on top of stack) | |
74 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); | |
75 | |
76 // get receiver klass | |
77 address npe_addr = __ pc(); | |
304 | 78 __ movptr(rax, Address(rcx, oopDesc::klass_offset_in_bytes())); |
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79 |
0 | 80 #ifndef PRODUCT |
81 if (DebugVtables) { | |
82 Label L; | |
83 // check offset vs vtable length | |
84 __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size()); | |
85 __ jcc(Assembler::greater, L); | |
86 __ movl(rbx, vtable_index); | |
87 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx); | |
88 __ bind(L); | |
89 } | |
90 #endif // PRODUCT | |
91 | |
92 const Register method = rbx; | |
93 | |
94 // load methodOop and target address | |
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95 __ lookup_virtual_method(rax, vtable_index, method); |
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96 |
0 | 97 if (DebugVtables) { |
98 Label L; | |
304 | 99 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 100 __ jcc(Assembler::equal, L); |
304 | 101 __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 102 __ jcc(Assembler::notZero, L); |
103 __ stop("Vtable entry is NULL"); | |
104 __ bind(L); | |
105 } | |
106 | |
107 // rax,: receiver klass | |
108 // method (rbx): methodOop | |
109 // rcx: receiver | |
110 address ame_addr = __ pc(); | |
111 __ jmp( Address(method, methodOopDesc::from_compiled_offset())); | |
112 | |
113 masm->flush(); | |
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114 |
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115 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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116 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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117 vtable_index, s->entry_point(), |
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118 (int)(s->code_end() - s->entry_point()), |
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119 (int)(s->code_end() - __ pc())); |
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120 } |
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121 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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122 // shut the door on sizing bugs |
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123 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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124 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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125 |
0 | 126 s->set_exception_points(npe_addr, ame_addr); |
127 return s; | |
128 } | |
129 | |
130 | |
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131 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
0 | 132 // Note well: pd_code_size_limit is the absolute minimum we can get away with. If you |
133 // add code here, bump the code stub size returned by pd_code_size_limit! | |
134 const int i486_code_length = VtableStub::pd_code_size_limit(false); | |
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135 VtableStub* s = new(i486_code_length) VtableStub(false, itable_index); |
0 | 136 ResourceMark rm; |
137 CodeBuffer cb(s->entry_point(), i486_code_length); | |
138 MacroAssembler* masm = new MacroAssembler(&cb); | |
139 | |
140 // Entry arguments: | |
141 // rax,: Interface | |
142 // rcx: Receiver | |
143 | |
144 #ifndef PRODUCT | |
145 if (CountCompiledCalls) { | |
304 | 146 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
0 | 147 } |
148 #endif /* PRODUCT */ | |
149 // get receiver (need to skip return address on top of stack) | |
150 | |
151 assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); | |
152 | |
153 // get receiver klass (also an implicit null-check) | |
154 address npe_addr = __ pc(); | |
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155 __ movptr(rsi, Address(rcx, oopDesc::klass_offset_in_bytes())); |
0 | 156 |
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157 // Most registers are in use; we'll use rax, rbx, rsi, rdi |
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158 // (If we need to make rsi, rdi callee-save, do a push/pop here.) |
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159 const Register method = rbx; |
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160 Label throw_icce; |
0 | 161 |
162 // Get methodOop and entrypoint for compiler | |
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163 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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164 rsi, rax, itable_index, |
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165 // outputs: method, scan temp. reg |
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166 method, rdi, |
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167 throw_icce); |
0 | 168 |
169 // method (rbx): methodOop | |
170 // rcx: receiver | |
171 | |
172 #ifdef ASSERT | |
173 if (DebugVtables) { | |
174 Label L1; | |
304 | 175 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 176 __ jcc(Assembler::equal, L1); |
304 | 177 __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 178 __ jcc(Assembler::notZero, L1); |
179 __ stop("methodOop is null"); | |
180 __ bind(L1); | |
181 } | |
182 #endif // ASSERT | |
183 | |
184 address ame_addr = __ pc(); | |
185 __ jmp(Address(method, methodOopDesc::from_compiled_offset())); | |
186 | |
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187 __ bind(throw_icce); |
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188 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
0 | 189 masm->flush(); |
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190 |
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191 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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192 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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193 itable_index, s->entry_point(), |
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194 (int)(s->code_end() - s->entry_point()), |
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195 (int)(s->code_end() - __ pc())); |
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196 } |
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197 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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198 // shut the door on sizing bugs |
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199 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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200 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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201 |
0 | 202 s->set_exception_points(npe_addr, ame_addr); |
203 return s; | |
204 } | |
205 | |
206 | |
207 | |
208 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
209 if (is_vtable_stub) { | |
210 // Vtable stub size | |
211 return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0); | |
212 } else { | |
213 // Itable stub size | |
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214 return (DebugVtables ? 256 : 66) + (CountCompiledCalls ? 6 : 0); |
0 | 215 } |
709
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216 // In order to tune these parameters, run the JVM with VM options |
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217 // +PrintMiscellaneous and +WizardMode to see information about |
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218 // actual itable stubs. Look for lines like this: |
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219 // itable #1 at 0x5551212[65] left over: 3 |
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220 // Reduce the constants so that the "left over" number is >=3 |
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221 // for the common cases. |
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222 // Do not aim at a left-over number of zero, because a |
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223 // large vtable or itable index (> 16) will require a 32-bit |
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224 // immediate displacement instead of an 8-bit one. |
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225 // |
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226 // The JVM98 app. _202_jess has a megamorphic interface call. |
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227 // The itable code looks like this: |
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228 // Decoding VtableStub itbl[1]@1 |
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229 // mov 0x4(%ecx),%esi |
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230 // mov 0xe8(%esi),%edi |
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231 // lea 0x130(%esi,%edi,4),%edi |
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232 // add $0x7,%edi |
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233 // and $0xfffffff8,%edi |
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234 // lea 0x4(%esi),%esi |
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235 // mov (%edi),%ebx |
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236 // cmp %ebx,%eax |
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237 // je success |
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238 // loop: |
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239 // test %ebx,%ebx |
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240 // je throw_icce |
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241 // add $0x8,%edi |
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242 // mov (%edi),%ebx |
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243 // cmp %ebx,%eax |
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244 // jne loop |
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245 // success: |
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246 // mov 0x4(%edi),%edi |
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247 // mov (%esi,%edi,1),%ebx |
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248 // jmp *0x44(%ebx) |
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249 // throw_icce: |
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250 // jmp throw_ICCE_entry |
0 | 251 } |
252 | |
253 int VtableStub::pd_code_alignment() { | |
254 return wordSize; | |
255 } |