Mercurial > hg > graal-compiler
annotate src/cpu/x86/vm/vtableStubs_x86_64.cpp @ 2865:7a4e6e11877f
Subclasses for Shift
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Tue, 07 Jun 2011 19:06:20 +0200 |
parents | f95d63e2154a |
children | 1d7922586cf6 |
rev | line source |
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0 | 1 /* |
1783 | 2 * Copyright (c) 2003, 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_64.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, | |
46 oop receiver, | |
47 int index); | |
48 #endif | |
49 | |
50 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { | |
51 const int amd64_code_length = VtableStub::pd_code_size_limit(true); | |
52 VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index); | |
53 ResourceMark rm; | |
54 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
55 MacroAssembler* masm = new MacroAssembler(&cb); | |
56 | |
57 #ifndef PRODUCT | |
58 if (CountCompiledCalls) { | |
59 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
60 } | |
61 #endif | |
62 | |
63 // get receiver (need to skip return address on top of stack) | |
64 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
65 | |
66 // Free registers (non-args) are rax, rbx | |
67 | |
68 // get receiver klass | |
69 address npe_addr = __ pc(); | |
113
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70 __ load_klass(rax, j_rarg0); |
0 | 71 |
72 // compute entry offset (in words) | |
73 int entry_offset = | |
74 instanceKlass::vtable_start_offset() + vtable_index * vtableEntry::size(); | |
75 | |
76 #ifndef PRODUCT | |
77 if (DebugVtables) { | |
78 Label L; | |
79 // check offset vs vtable length | |
80 __ cmpl(Address(rax, instanceKlass::vtable_length_offset() * wordSize), | |
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 | |
90 // load methodOop and target address | |
91 const Register method = rbx; | |
92 | |
304 | 93 __ movptr(method, Address(rax, |
94 entry_offset * wordSize + | |
95 vtableEntry::method_offset_in_bytes())); | |
0 | 96 if (DebugVtables) { |
97 Label L; | |
304 | 98 __ cmpptr(method, (int32_t)NULL_WORD); |
0 | 99 __ jcc(Assembler::equal, L); |
304 | 100 __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD); |
0 | 101 __ jcc(Assembler::notZero, L); |
102 __ stop("Vtable entry is NULL"); | |
103 __ bind(L); | |
104 } | |
105 // rax: receiver klass | |
106 // rbx: methodOop | |
107 // rcx: receiver | |
108 address ame_addr = __ pc(); | |
109 __ jmp( Address(rbx, methodOopDesc::from_compiled_offset())); | |
110 | |
111 __ flush(); | |
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112 |
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113 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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114 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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115 vtable_index, s->entry_point(), |
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116 (int)(s->code_end() - s->entry_point()), |
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117 (int)(s->code_end() - __ pc())); |
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118 } |
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119 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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120 // shut the door on sizing bugs |
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121 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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122 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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123 |
0 | 124 s->set_exception_points(npe_addr, ame_addr); |
125 return s; | |
126 } | |
127 | |
128 | |
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129 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
0 | 130 // Note well: pd_code_size_limit is the absolute minimum we can get |
131 // away with. If you add code here, bump the code stub size | |
132 // returned by pd_code_size_limit! | |
133 const int amd64_code_length = VtableStub::pd_code_size_limit(false); | |
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134 VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index); |
0 | 135 ResourceMark rm; |
136 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
137 MacroAssembler* masm = new MacroAssembler(&cb); | |
138 | |
139 #ifndef PRODUCT | |
140 if (CountCompiledCalls) { | |
141 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
142 } | |
143 #endif | |
144 | |
145 // Entry arguments: | |
146 // rax: Interface | |
147 // j_rarg0: Receiver | |
148 | |
149 // Free registers (non-args) are rax (interface), rbx | |
150 | |
151 // get receiver (need to skip return address on top of stack) | |
152 | |
153 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
154 // get receiver klass (also an implicit null-check) | |
155 address npe_addr = __ pc(); | |
156 | |
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157 // Most registers are in use; we'll use rax, rbx, r10, r11 |
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158 // (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them) |
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159 __ load_klass(r10, j_rarg0); |
0 | 160 |
161 // If we take a trap while this arg is on the stack we will not | |
162 // be able to walk the stack properly. This is not an issue except | |
163 // when there are mistakes in this assembly code that could generate | |
164 // a spurious fault. Ask me how I know... | |
165 | |
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166 const Register method = rbx; |
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167 Label throw_icce; |
0 | 168 |
169 // Get methodOop and entrypoint for compiler | |
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170 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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171 r10, rax, itable_index, |
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172 // outputs: method, scan temp. reg |
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173 method, r11, |
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174 throw_icce); |
0 | 175 |
176 // method (rbx): methodOop | |
177 // j_rarg0: receiver | |
178 | |
179 #ifdef ASSERT | |
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180 if (DebugVtables) { |
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181 Label L2; |
304 | 182 __ cmpptr(method, (int32_t)NULL_WORD); |
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183 __ jcc(Assembler::equal, L2); |
304 | 184 __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD); |
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185 __ jcc(Assembler::notZero, L2); |
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186 __ stop("compiler entrypoint is null"); |
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187 __ bind(L2); |
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188 } |
0 | 189 #endif // ASSERT |
190 | |
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191 // rbx: methodOop |
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192 // j_rarg0: receiver |
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193 address ame_addr = __ pc(); |
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194 __ jmp(Address(method, methodOopDesc::from_compiled_offset())); |
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195 |
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196 __ bind(throw_icce); |
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197 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
0 | 198 |
199 __ flush(); | |
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200 |
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201 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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202 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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203 itable_index, s->entry_point(), |
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204 (int)(s->code_end() - s->entry_point()), |
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205 (int)(s->code_end() - __ pc())); |
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206 } |
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207 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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208 // shut the door on sizing bugs |
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209 int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
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210 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
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211 |
0 | 212 s->set_exception_points(npe_addr, ame_addr); |
213 return s; | |
214 } | |
215 | |
216 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
217 if (is_vtable_stub) { | |
218 // Vtable stub size | |
113
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219 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) + |
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220 (UseCompressedOops ? 16 : 0); // 1 leaq can be 3 bytes + 1 long |
0 | 221 } else { |
222 // Itable stub size | |
1783 | 223 return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) + |
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224 (UseCompressedOops ? 32 : 0); // 2 leaqs |
0 | 225 } |
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226 // In order to tune these parameters, run the JVM with VM options |
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227 // +PrintMiscellaneous and +WizardMode to see information about |
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228 // actual itable stubs. Look for lines like this: |
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229 // itable #1 at 0x5551212[71] left over: 3 |
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230 // Reduce the constants so that the "left over" number is >=3 |
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231 // for the common cases. |
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232 // Do not aim at a left-over number of zero, because a |
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233 // large vtable or itable index (>= 32) will require a 32-bit |
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234 // immediate displacement instead of an 8-bit one. |
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235 // |
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236 // The JVM98 app. _202_jess has a megamorphic interface call. |
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237 // The itable code looks like this: |
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238 // Decoding VtableStub itbl[1]@12 |
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239 // mov 0x8(%rsi),%r10 |
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240 // mov 0x198(%r10),%r11d |
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241 // lea 0x218(%r10,%r11,8),%r11 |
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242 // lea 0x8(%r10),%r10 |
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243 // mov (%r11),%rbx |
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244 // cmp %rbx,%rax |
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245 // je success |
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246 // loop: |
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247 // test %rbx,%rbx |
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248 // je throw_icce |
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249 // add $0x10,%r11 |
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250 // mov (%r11),%rbx |
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251 // cmp %rbx,%rax |
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252 // jne loop |
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253 // success: |
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254 // mov 0x8(%r11),%r11d |
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255 // mov (%r10,%r11,1),%rbx |
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256 // jmpq *0x60(%rbx) |
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257 // throw_icce: |
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258 // jmpq throw_ICCE_entry |
0 | 259 } |
260 | |
261 int VtableStub::pd_code_alignment() { | |
262 return wordSize; | |
263 } |