Tue, 10 Mar 2009 08:52:16 -0700
Merge
1 /*
2 * Copyright 2003-2008 Sun Microsystems, Inc. All Rights Reserved.
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 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_vtableStubs_x86_64.cpp.incl"
28 // machine-dependent part of VtableStubs: create VtableStub of correct size and
29 // initialize its code
31 #define __ masm->
33 #ifndef PRODUCT
34 extern "C" void bad_compiled_vtable_index(JavaThread* thread,
35 oop receiver,
36 int index);
37 #endif
39 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
40 const int amd64_code_length = VtableStub::pd_code_size_limit(true);
41 VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index);
42 ResourceMark rm;
43 CodeBuffer cb(s->entry_point(), amd64_code_length);
44 MacroAssembler* masm = new MacroAssembler(&cb);
46 #ifndef PRODUCT
47 if (CountCompiledCalls) {
48 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
49 }
50 #endif
52 // get receiver (need to skip return address on top of stack)
53 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
55 // Free registers (non-args) are rax, rbx
57 // get receiver klass
58 address npe_addr = __ pc();
59 __ load_klass(rax, j_rarg0);
61 // compute entry offset (in words)
62 int entry_offset =
63 instanceKlass::vtable_start_offset() + vtable_index * vtableEntry::size();
65 #ifndef PRODUCT
66 if (DebugVtables) {
67 Label L;
68 // check offset vs vtable length
69 __ cmpl(Address(rax, instanceKlass::vtable_length_offset() * wordSize),
70 vtable_index * vtableEntry::size());
71 __ jcc(Assembler::greater, L);
72 __ movl(rbx, vtable_index);
73 __ call_VM(noreg,
74 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx);
75 __ bind(L);
76 }
77 #endif // PRODUCT
79 // load methodOop and target address
80 const Register method = rbx;
82 __ movptr(method, Address(rax,
83 entry_offset * wordSize +
84 vtableEntry::method_offset_in_bytes()));
85 if (DebugVtables) {
86 Label L;
87 __ cmpptr(method, (int32_t)NULL_WORD);
88 __ jcc(Assembler::equal, L);
89 __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD);
90 __ jcc(Assembler::notZero, L);
91 __ stop("Vtable entry is NULL");
92 __ bind(L);
93 }
94 // rax: receiver klass
95 // rbx: methodOop
96 // rcx: receiver
97 address ame_addr = __ pc();
98 __ jmp( Address(rbx, methodOopDesc::from_compiled_offset()));
100 __ flush();
102 if (PrintMiscellaneous && (WizardMode || Verbose)) {
103 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
104 vtable_index, s->entry_point(),
105 (int)(s->code_end() - s->entry_point()),
106 (int)(s->code_end() - __ pc()));
107 }
108 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
110 s->set_exception_points(npe_addr, ame_addr);
111 return s;
112 }
115 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
116 // Note well: pd_code_size_limit is the absolute minimum we can get
117 // away with. If you add code here, bump the code stub size
118 // returned by pd_code_size_limit!
119 const int amd64_code_length = VtableStub::pd_code_size_limit(false);
120 VtableStub* s = new(amd64_code_length) VtableStub(false, itable_index);
121 ResourceMark rm;
122 CodeBuffer cb(s->entry_point(), amd64_code_length);
123 MacroAssembler* masm = new MacroAssembler(&cb);
125 #ifndef PRODUCT
126 if (CountCompiledCalls) {
127 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
128 }
129 #endif
131 // Entry arguments:
132 // rax: Interface
133 // j_rarg0: Receiver
135 // Free registers (non-args) are rax (interface), rbx
137 // get receiver (need to skip return address on top of stack)
139 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
140 // get receiver klass (also an implicit null-check)
141 address npe_addr = __ pc();
143 // Most registers are in use; we'll use rax, rbx, r10, r11
144 // (various calling sequences use r[cd]x, r[sd]i, r[89]; stay away from them)
145 __ load_klass(r10, j_rarg0);
147 // If we take a trap while this arg is on the stack we will not
148 // be able to walk the stack properly. This is not an issue except
149 // when there are mistakes in this assembly code that could generate
150 // a spurious fault. Ask me how I know...
152 const Register method = rbx;
153 Label throw_icce;
155 // Get methodOop and entrypoint for compiler
156 __ lookup_interface_method(// inputs: rec. class, interface, itable index
157 r10, rax, itable_index,
158 // outputs: method, scan temp. reg
159 method, r11,
160 throw_icce);
162 // method (rbx): methodOop
163 // j_rarg0: receiver
165 #ifdef ASSERT
166 if (DebugVtables) {
167 Label L2;
168 __ cmpptr(method, (int32_t)NULL_WORD);
169 __ jcc(Assembler::equal, L2);
170 __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD);
171 __ jcc(Assembler::notZero, L2);
172 __ stop("compiler entrypoint is null");
173 __ bind(L2);
174 }
175 #endif // ASSERT
177 // rbx: methodOop
178 // j_rarg0: receiver
179 address ame_addr = __ pc();
180 __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
182 __ bind(throw_icce);
183 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
185 __ flush();
187 if (PrintMiscellaneous && (WizardMode || Verbose)) {
188 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
189 itable_index, s->entry_point(),
190 (int)(s->code_end() - s->entry_point()),
191 (int)(s->code_end() - __ pc()));
192 }
193 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
195 s->set_exception_points(npe_addr, ame_addr);
196 return s;
197 }
199 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
200 if (is_vtable_stub) {
201 // Vtable stub size
202 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0) +
203 (UseCompressedOops ? 16 : 0); // 1 leaq can be 3 bytes + 1 long
204 } else {
205 // Itable stub size
206 return (DebugVtables ? 512 : 72) + (CountCompiledCalls ? 13 : 0) +
207 (UseCompressedOops ? 32 : 0); // 2 leaqs
208 }
209 }
211 int VtableStub::pd_code_alignment() {
212 return wordSize;
213 }