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src/share/vm/code/icBuffer.cpp@c18cbe5936b8 (annotated)

src/share/vm/code/icBuffer.cpp

Thu, 27 May 2010 19:08:38 -0700

author
trims
date
Thu, 27 May 2010 19:08:38 -0700
changeset 1907
c18cbe5936b8
parent 435
a61af66fc99e
child 2314
f95d63e2154a
permissions
-rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

duke@435 1 /*
trims@1907 2 * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved.
duke@435 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435 4 *
duke@435 5 * This code is free software; you can redistribute it and/or modify it
duke@435 6 * under the terms of the GNU General Public License version 2 only, as
duke@435 7 * published by the Free Software Foundation.
duke@435 8 *
duke@435 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@435 13 * accompanied this code).
duke@435 14 *
duke@435 15 * You should have received a copy of the GNU General Public License version
duke@435 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@435 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435 18 *
trims@1907 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907 20 * or visit www.oracle.com if you need additional information or have any
trims@1907 21 * questions.
duke@435 22 *
duke@435 23 */
duke@435 24
duke@435 25 #include "incls/_precompiled.incl"
duke@435 26 #include "incls/_icBuffer.cpp.incl"
duke@435 27
duke@435 28
duke@435 29 DEF_STUB_INTERFACE(ICStub);
duke@435 30
duke@435 31 StubQueue* InlineCacheBuffer::_buffer = NULL;
duke@435 32 ICStub* InlineCacheBuffer::_next_stub = NULL;
duke@435 33
duke@435 34
duke@435 35 void ICStub::finalize() {
duke@435 36 if (!is_empty()) {
duke@435 37 ResourceMark rm;
duke@435 38 CompiledIC *ic = CompiledIC_at(ic_site());
duke@435 39 assert(CodeCache::find_nmethod(ic->instruction_address()) != NULL, "inline cache in non-nmethod?");
duke@435 40
duke@435 41 assert(this == ICStub_from_destination_address(ic->stub_address()), "wrong owner of ic buffer");
duke@435 42 ic->set_cached_oop(cached_oop());
duke@435 43 ic->set_ic_destination(destination());
duke@435 44 }
duke@435 45 }
duke@435 46
duke@435 47
duke@435 48 address ICStub::destination() const {
duke@435 49 return InlineCacheBuffer::ic_buffer_entry_point(code_begin());
duke@435 50 }
duke@435 51
duke@435 52 oop ICStub::cached_oop() const {
duke@435 53 return InlineCacheBuffer::ic_buffer_cached_oop(code_begin());
duke@435 54 }
duke@435 55
duke@435 56
duke@435 57 void ICStub::set_stub(CompiledIC *ic, oop cached_value, address dest_addr) {
duke@435 58 // We cannot store a pointer to the 'ic' object, since it is resource allocated. Instead we
duke@435 59 // store the location of the inline cache. Then we have enough information recreate the CompiledIC
duke@435 60 // object when we need to remove the stub.
duke@435 61 _ic_site = ic->instruction_address();
duke@435 62
duke@435 63 // Assemble new stub
duke@435 64 InlineCacheBuffer::assemble_ic_buffer_code(code_begin(), cached_value, dest_addr);
duke@435 65 assert(destination() == dest_addr, "can recover destination");
duke@435 66 assert(cached_oop() == cached_value, "can recover destination");
duke@435 67 }
duke@435 68
duke@435 69
duke@435 70 void ICStub::clear() {
duke@435 71 _ic_site = NULL;
duke@435 72 }
duke@435 73
duke@435 74
duke@435 75 #ifndef PRODUCT
duke@435 76 // anybody calling to this stub will trap
duke@435 77
duke@435 78 void ICStub::verify() {
duke@435 79 }
duke@435 80
duke@435 81 void ICStub::print() {
duke@435 82 tty->print_cr("ICStub: site: " INTPTR_FORMAT, _ic_site);
duke@435 83 }
duke@435 84 #endif
duke@435 85
duke@435 86 //-----------------------------------------------------------------------------------------------
duke@435 87 // Implementation of InlineCacheBuffer
duke@435 88
duke@435 89 void InlineCacheBuffer::init_next_stub() {
duke@435 90 ICStub* ic_stub = (ICStub*)buffer()->request_committed (ic_stub_code_size());
duke@435 91 assert (ic_stub != NULL, "no room for a single stub");
duke@435 92 set_next_stub(ic_stub);
duke@435 93 }
duke@435 94
duke@435 95 void InlineCacheBuffer::initialize() {
duke@435 96 if (_buffer != NULL) return; // already initialized
duke@435 97 _buffer = new StubQueue(new ICStubInterface, 10*K, InlineCacheBuffer_lock, "InlineCacheBuffer");
duke@435 98 assert (_buffer != NULL, "cannot allocate InlineCacheBuffer");
duke@435 99 init_next_stub();
duke@435 100 }
duke@435 101
duke@435 102
duke@435 103 ICStub* InlineCacheBuffer::new_ic_stub() {
duke@435 104 while (true) {
duke@435 105 ICStub* ic_stub = (ICStub*)buffer()->request_committed(ic_stub_code_size());
duke@435 106 if (ic_stub != NULL) {
duke@435 107 return ic_stub;
duke@435 108 }
duke@435 109 // we ran out of inline cache buffer space; must enter safepoint.
duke@435 110 // We do this by forcing a safepoint
duke@435 111 EXCEPTION_MARK;
duke@435 112
duke@435 113 VM_ForceSafepoint vfs;
duke@435 114 VMThread::execute(&vfs);
duke@435 115 // We could potential get an async. exception at this point.
duke@435 116 // In that case we will rethrow it to ourselvs.
duke@435 117 if (HAS_PENDING_EXCEPTION) {
duke@435 118 oop exception = PENDING_EXCEPTION;
duke@435 119 CLEAR_PENDING_EXCEPTION;
duke@435 120 Thread::send_async_exception(JavaThread::current()->threadObj(), exception);
duke@435 121 }
duke@435 122 }
duke@435 123 ShouldNotReachHere();
duke@435 124 return NULL;
duke@435 125 }
duke@435 126
duke@435 127
duke@435 128 void InlineCacheBuffer::update_inline_caches() {
duke@435 129 if (buffer()->number_of_stubs() > 1) {
duke@435 130 if (TraceICBuffer) {
duke@435 131 tty->print_cr("[updating inline caches with %d stubs]", buffer()->number_of_stubs());
duke@435 132 }
duke@435 133 buffer()->remove_all();
duke@435 134 init_next_stub();
duke@435 135 }
duke@435 136 }
duke@435 137
duke@435 138
duke@435 139 bool InlineCacheBuffer::contains(address instruction_address) {
duke@435 140 return buffer()->contains(instruction_address);
duke@435 141 }
duke@435 142
duke@435 143
duke@435 144 bool InlineCacheBuffer::is_empty() {
duke@435 145 return buffer()->number_of_stubs() == 1; // always has sentinel
duke@435 146 }
duke@435 147
duke@435 148
duke@435 149 void InlineCacheBuffer_init() {
duke@435 150 InlineCacheBuffer::initialize();
duke@435 151 }
duke@435 152
duke@435 153
duke@435 154 void InlineCacheBuffer::create_transition_stub(CompiledIC *ic, oop cached_oop, address entry) {
duke@435 155 assert(!SafepointSynchronize::is_at_safepoint(), "should not be called during a safepoint");
duke@435 156 assert (CompiledIC_lock->is_locked(), "");
duke@435 157 assert(cached_oop == NULL || cached_oop->is_perm(), "must belong to perm. space");
duke@435 158 if (TraceICBuffer) { tty->print_cr(" create transition stub for " INTPTR_FORMAT, ic->instruction_address()); }
duke@435 159
duke@435 160 // If an transition stub is already associate with the inline cache, then we remove the association.
duke@435 161 if (ic->is_in_transition_state()) {
duke@435 162 ICStub* old_stub = ICStub_from_destination_address(ic->stub_address());
duke@435 163 old_stub->clear();
duke@435 164 }
duke@435 165
duke@435 166 // allocate and initialize new "out-of-line" inline-cache
duke@435 167 ICStub* ic_stub = get_next_stub();
duke@435 168 ic_stub->set_stub(ic, cached_oop, entry);
duke@435 169
duke@435 170 // Update inline cache in nmethod to point to new "out-of-line" allocated inline cache
duke@435 171 ic->set_ic_destination(ic_stub->code_begin());
duke@435 172
duke@435 173 set_next_stub(new_ic_stub()); // can cause safepoint synchronization
duke@435 174 }
duke@435 175
duke@435 176
duke@435 177 address InlineCacheBuffer::ic_destination_for(CompiledIC *ic) {
duke@435 178 ICStub* stub = ICStub_from_destination_address(ic->stub_address());
duke@435 179 return stub->destination();
duke@435 180 }
duke@435 181
duke@435 182
duke@435 183 oop InlineCacheBuffer::cached_oop_for(CompiledIC *ic) {
duke@435 184 ICStub* stub = ICStub_from_destination_address(ic->stub_address());
duke@435 185 return stub->cached_oop();
duke@435 186 }

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