Sat, 29 Sep 2012 06:40:00 -0400
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
Summary: Capitalize these metadata types (and objArrayKlass)
Reviewed-by: stefank, twisti, kvn
1 /*
2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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.
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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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
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
39 // machine-dependent part of VtableStubs: create VtableStub of correct size and
40 // initialize its code
42 #define __ masm->
44 #ifndef PRODUCT
45 extern "C" void bad_compiled_vtable_index(JavaThread* thread,
46 oop receiver,
47 int index);
48 #endif
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);
57 #ifndef PRODUCT
58 if (CountCompiledCalls) {
59 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
60 }
61 #endif
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");
66 // Free registers (non-args) are rax, rbx
68 // get receiver klass
69 address npe_addr = __ pc();
70 __ load_klass(rax, j_rarg0);
72 #ifndef PRODUCT
73 if (DebugVtables) {
74 Label L;
75 // check offset vs vtable length
76 __ cmpl(Address(rax, InstanceKlass::vtable_length_offset() * wordSize),
77 vtable_index * vtableEntry::size());
78 __ jcc(Assembler::greater, L);
79 __ movl(rbx, vtable_index);
80 __ call_VM(noreg,
81 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx);
82 __ bind(L);
83 }
84 #endif // PRODUCT
86 // load Method* and target address
87 const Register method = rbx;
89 __ lookup_virtual_method(rax, vtable_index, method);
91 if (DebugVtables) {
92 Label L;
93 __ cmpptr(method, (int32_t)NULL_WORD);
94 __ jcc(Assembler::equal, L);
95 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
96 __ jcc(Assembler::notZero, L);
97 __ stop("Vtable entry is NULL");
98 __ bind(L);
99 }
100 // rax: receiver klass
101 // rbx: Method*
102 // rcx: receiver
103 address ame_addr = __ pc();
104 __ jmp( Address(rbx, Method::from_compiled_offset()));
106 __ flush();
108 if (PrintMiscellaneous && (WizardMode || Verbose)) {
109 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
110 vtable_index, s->entry_point(),
111 (int)(s->code_end() - s->entry_point()),
112 (int)(s->code_end() - __ pc()));
113 }
114 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
115 // shut the door on sizing bugs
116 int slop = 3; // 32-bit offset is this much larger than an 8-bit one
117 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
119 s->set_exception_points(npe_addr, ame_addr);
120 return s;
121 }
124 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
125 // Note well: pd_code_size_limit is the absolute minimum we can get
126 // away with. If you add code here, bump the code stub size
127 // returned by pd_code_size_limit!
128 const int amd64_code_length = VtableStub::pd_code_size_limit(false);
129 VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index);
130 ResourceMark rm;
131 CodeBuffer cb(s->entry_point(), amd64_code_length);
132 MacroAssembler* masm = new MacroAssembler(&cb);
134 #ifndef PRODUCT
135 if (CountCompiledCalls) {
136 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
137 }
138 #endif
140 // Entry arguments:
141 // rax: Interface
142 // j_rarg0: Receiver
144 // Free registers (non-args) are rax (interface), rbx
146 // get receiver (need to skip return address on top of stack)
148 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
149 // get receiver klass (also an implicit null-check)
150 address npe_addr = __ pc();
152 // Most registers are in use; we'll use rax, rbx, r10, r11
153 // (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them)
154 __ load_klass(r10, j_rarg0);
156 // If we take a trap while this arg is on the stack we will not
157 // be able to walk the stack properly. This is not an issue except
158 // when there are mistakes in this assembly code that could generate
159 // a spurious fault. Ask me how I know...
161 const Register method = rbx;
162 Label throw_icce;
164 // Get Method* and entrypoint for compiler
165 __ lookup_interface_method(// inputs: rec. class, interface, itable index
166 r10, rax, itable_index,
167 // outputs: method, scan temp. reg
168 method, r11,
169 throw_icce);
171 // method (rbx): Method*
172 // j_rarg0: receiver
174 #ifdef ASSERT
175 if (DebugVtables) {
176 Label L2;
177 __ cmpptr(method, (int32_t)NULL_WORD);
178 __ jcc(Assembler::equal, L2);
179 __ cmpptr(Address(method, Method::from_compiled_offset()), (int32_t)NULL_WORD);
180 __ jcc(Assembler::notZero, L2);
181 __ stop("compiler entrypoint is null");
182 __ bind(L2);
183 }
184 #endif // ASSERT
186 // rbx: Method*
187 // j_rarg0: receiver
188 address ame_addr = __ pc();
189 __ jmp(Address(method, Method::from_compiled_offset()));
191 __ bind(throw_icce);
192 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
194 __ flush();
196 if (PrintMiscellaneous && (WizardMode || Verbose)) {
197 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
198 itable_index, s->entry_point(),
199 (int)(s->code_end() - s->entry_point()),
200 (int)(s->code_end() - __ pc()));
201 }
202 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
203 // shut the door on sizing bugs
204 int slop = 3; // 32-bit offset is this much larger than an 8-bit one
205 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset");
207 s->set_exception_points(npe_addr, ame_addr);
208 return s;
209 }
211 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
212 if (is_vtable_stub) {
213 // Vtable stub size
214 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) +
215 (UseCompressedOops ? 16 : 0); // 1 leaq can be 3 bytes + 1 long
216 } else {
217 // Itable stub size
218 return (DebugVtables ? 512 : 74) + (CountCompiledCalls ? 13 : 0) +
219 (UseCompressedOops ? 32 : 0); // 2 leaqs
220 }
221 // In order to tune these parameters, run the JVM with VM options
222 // +PrintMiscellaneous and +WizardMode to see information about
223 // actual itable stubs. Look for lines like this:
224 // itable #1 at 0x5551212[71] left over: 3
225 // Reduce the constants so that the "left over" number is >=3
226 // for the common cases.
227 // Do not aim at a left-over number of zero, because a
228 // large vtable or itable index (>= 32) will require a 32-bit
229 // immediate displacement instead of an 8-bit one.
230 //
231 // The JVM98 app. _202_jess has a megamorphic interface call.
232 // The itable code looks like this:
233 // Decoding VtableStub itbl[1]@12
234 // mov 0x8(%rsi),%r10
235 // mov 0x198(%r10),%r11d
236 // lea 0x218(%r10,%r11,8),%r11
237 // lea 0x8(%r10),%r10
238 // mov (%r11),%rbx
239 // cmp %rbx,%rax
240 // je success
241 // loop:
242 // test %rbx,%rbx
243 // je throw_icce
244 // add $0x10,%r11
245 // mov (%r11),%rbx
246 // cmp %rbx,%rax
247 // jne loop
248 // success:
249 // mov 0x8(%r11),%r11d
250 // mov (%r10,%r11,1),%rbx
251 // jmpq *0x60(%rbx)
252 // throw_icce:
253 // jmpq throw_ICCE_entry
254 }
256 int VtableStub::pd_code_alignment() {
257 return wordSize;
258 }