Mercurial > hg > truffle
annotate src/cpu/x86/vm/vtableStubs_x86_64.cpp @ 8654:3bbad4ec6510
new phase: PushNodesThroughPi
author | Bernhard Urban <bernhard.urban@jku.at> |
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date | Thu, 04 Apr 2013 16:03:08 +0200 |
parents | cd3d6a6b95d9 |
children | 740e263c80c6 |
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0 | 1 /* |
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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" |
28 #include "interp_masm_x86_64.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, | |
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); | |
52 ResourceMark rm; | |
53 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
54 MacroAssembler* masm = new MacroAssembler(&cb); | |
55 | |
56 #ifndef PRODUCT | |
57 if (CountCompiledCalls) { | |
58 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
59 } | |
60 #endif | |
61 | |
62 // get receiver (need to skip return address on top of stack) | |
63 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
64 | |
65 // Free registers (non-args) are rax, rbx | |
66 | |
67 // get receiver klass | |
68 address npe_addr = __ pc(); | |
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69 __ load_klass(rax, j_rarg0); |
0 | 70 |
71 #ifndef PRODUCT | |
72 if (DebugVtables) { | |
73 Label L; | |
74 // check offset vs vtable length | |
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75 __ cmpl(Address(rax, InstanceKlass::vtable_length_offset() * wordSize), |
0 | 76 vtable_index * vtableEntry::size()); |
77 __ jcc(Assembler::greater, L); | |
78 __ movl(rbx, vtable_index); | |
79 __ call_VM(noreg, | |
80 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx); | |
81 __ bind(L); | |
82 } | |
83 #endif // PRODUCT | |
84 | |
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85 // load Method* and target address |
0 | 86 const Register method = rbx; |
87 | |
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88 __ lookup_virtual_method(rax, vtable_index, method); |
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89 |
0 | 90 if (DebugVtables) { |
91 Label L; | |
304 | 92 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 93 __ jcc(Assembler::equal, L); |
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94 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 95 __ jcc(Assembler::notZero, L); |
96 __ stop("Vtable entry is NULL"); | |
97 __ bind(L); | |
98 } | |
99 // rax: receiver klass | |
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100 // rbx: Method* |
0 | 101 // rcx: receiver |
102 address ame_addr = __ pc(); | |
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103 __ jmp( Address(rbx, Method::from_compiled_offset())); |
0 | 104 |
105 __ flush(); | |
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106 |
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107 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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108 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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109 vtable_index, s->entry_point(), |
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110 (int)(s->code_end() - s->entry_point()), |
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111 (int)(s->code_end() - __ pc())); |
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112 } |
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113 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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114 // shut the door on sizing bugs |
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115 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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116 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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117 |
0 | 118 s->set_exception_points(npe_addr, ame_addr); |
119 return s; | |
120 } | |
121 | |
122 | |
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123 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
0 | 124 // Note well: pd_code_size_limit is the absolute minimum we can get |
125 // away with. If you add code here, bump the code stub size | |
126 // returned by pd_code_size_limit! | |
127 const int amd64_code_length = VtableStub::pd_code_size_limit(false); | |
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128 VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index); |
0 | 129 ResourceMark rm; |
130 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
131 MacroAssembler* masm = new MacroAssembler(&cb); | |
132 | |
133 #ifndef PRODUCT | |
134 if (CountCompiledCalls) { | |
135 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
136 } | |
137 #endif | |
138 | |
139 // Entry arguments: | |
140 // rax: Interface | |
141 // j_rarg0: Receiver | |
142 | |
143 // Free registers (non-args) are rax (interface), rbx | |
144 | |
145 // get receiver (need to skip return address on top of stack) | |
146 | |
147 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
148 // get receiver klass (also an implicit null-check) | |
149 address npe_addr = __ pc(); | |
150 | |
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151 // Most registers are in use; we'll use rax, rbx, r10, r11 |
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152 // (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them) |
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153 __ load_klass(r10, j_rarg0); |
0 | 154 |
155 // If we take a trap while this arg is on the stack we will not | |
156 // be able to walk the stack properly. This is not an issue except | |
157 // when there are mistakes in this assembly code that could generate | |
158 // a spurious fault. Ask me how I know... | |
159 | |
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160 const Register method = rbx; |
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161 Label throw_icce; |
0 | 162 |
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163 // Get Method* and entrypoint for compiler |
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164 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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165 r10, rax, itable_index, |
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166 // outputs: method, scan temp. reg |
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167 method, r11, |
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168 throw_icce); |
0 | 169 |
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170 // method (rbx): Method* |
0 | 171 // j_rarg0: receiver |
172 | |
173 #ifdef ASSERT | |
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174 if (DebugVtables) { |
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175 Label L2; |
304 | 176 __ cmpptr(method, (int32_t)NULL_WORD); |
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177 __ jcc(Assembler::equal, L2); |
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178 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD); |
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179 __ jcc(Assembler::notZero, L2); |
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180 __ stop("compiler entrypoint is null"); |
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181 __ bind(L2); |
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182 } |
0 | 183 #endif // ASSERT |
184 | |
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185 // rbx: Method* |
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186 // j_rarg0: receiver |
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187 address ame_addr = __ pc(); |
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188 __ jmp(Address(method, Method::from_compiled_offset())); |
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189 |
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190 __ bind(throw_icce); |
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191 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
0 | 192 |
193 __ flush(); | |
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194 |
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195 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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196 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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197 itable_index, s->entry_point(), |
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198 (int)(s->code_end() - s->entry_point()), |
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199 (int)(s->code_end() - __ pc())); |
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200 } |
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201 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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202 // shut the door on sizing bugs |
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203 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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204 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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205 |
0 | 206 s->set_exception_points(npe_addr, ame_addr); |
207 return s; | |
208 } | |
209 | |
210 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
211 if (is_vtable_stub) { | |
212 // Vtable stub size | |
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213 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) + |
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214 (UseCompressedKlassPointers ? 16 : 0); // 1 leaq can be 3 bytes + 1 long |
0 | 215 } else { |
216 // Itable stub size | |
1783 | 217 return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) + |
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218 (UseCompressedKlassPointers ? 32 : 0); // 2 leaqs |
0 | 219 } |
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220 // In order to tune these parameters, run the JVM with VM options |
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221 // +PrintMiscellaneous and +WizardMode to see information about |
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222 // actual itable stubs. Look for lines like this: |
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223 // itable #1 at 0x5551212[71] left over: 3 |
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224 // Reduce the constants so that the "left over" number is >=3 |
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225 // for the common cases. |
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226 // Do not aim at a left-over number of zero, because a |
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227 // large vtable or itable index (>= 32) will require a 32-bit |
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228 // immediate displacement instead of an 8-bit one. |
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229 // |
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230 // The JVM98 app. _202_jess has a megamorphic interface call. |
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231 // The itable code looks like this: |
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232 // Decoding VtableStub itbl[1]@12 |
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233 // mov 0x8(%rsi),%r10 |
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234 // mov 0x198(%r10),%r11d |
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235 // lea 0x218(%r10,%r11,8),%r11 |
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236 // lea 0x8(%r10),%r10 |
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237 // mov (%r11),%rbx |
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238 // cmp %rbx,%rax |
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239 // je success |
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240 // loop: |
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241 // test %rbx,%rbx |
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242 // je throw_icce |
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243 // add $0x10,%r11 |
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244 // mov (%r11),%rbx |
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245 // cmp %rbx,%rax |
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246 // jne loop |
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247 // success: |
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248 // mov 0x8(%r11),%r11d |
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249 // mov (%r10,%r11,1),%rbx |
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250 // jmpq *0x60(%rbx) |
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251 // throw_icce: |
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252 // jmpq throw_ICCE_entry |
0 | 253 } |
254 | |
255 int VtableStub::pd_code_alignment() { | |
256 return wordSize; | |
257 } |