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hotspot/src/share/vm/code/icBuffer.cpp

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+/*
+ * Copyright 1997-2006 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_icBuffer.cpp.incl"
+
+
+DEF_STUB_INTERFACE(ICStub);
+
+StubQueue* InlineCacheBuffer::_buffer    = NULL;
+ICStub*    InlineCacheBuffer::_next_stub = NULL;
+
+
+void ICStub::finalize() {
+  if (!is_empty()) {
+    ResourceMark rm;
+    CompiledIC *ic = CompiledIC_at(ic_site());
+    assert(CodeCache::find_nmethod(ic->instruction_address()) != NULL, "inline cache in non-nmethod?");
+
+    assert(this == ICStub_from_destination_address(ic->stub_address()), "wrong owner of ic buffer");
+    ic->set_cached_oop(cached_oop());
+    ic->set_ic_destination(destination());
+  }
+}
+
+
+address ICStub::destination() const {
+  return InlineCacheBuffer::ic_buffer_entry_point(code_begin());
+}
+
+oop ICStub::cached_oop() const {
+  return InlineCacheBuffer::ic_buffer_cached_oop(code_begin());
+}
+
+
+void ICStub::set_stub(CompiledIC *ic, oop cached_value, address dest_addr) {
+  // We cannot store a pointer to the 'ic' object, since it is resource allocated. Instead we
+  // store the location of the inline cache. Then we have enough information recreate the CompiledIC
+  // object when we need to remove the stub.
+  _ic_site = ic->instruction_address();
+
+  // Assemble new stub
+  InlineCacheBuffer::assemble_ic_buffer_code(code_begin(), cached_value, dest_addr);
+  assert(destination() == dest_addr,   "can recover destination");
+  assert(cached_oop() == cached_value, "can recover destination");
+}
+
+
+void ICStub::clear() {
+  _ic_site = NULL;
+}
+
+
+#ifndef PRODUCT
+// anybody calling to this stub will trap
+
+void ICStub::verify() {
+}
+
+void ICStub::print() {
+  tty->print_cr("ICStub: site: " INTPTR_FORMAT, _ic_site);
+}
+#endif
+
+//-----------------------------------------------------------------------------------------------
+// Implementation of InlineCacheBuffer
+
+void InlineCacheBuffer::init_next_stub() {
+  ICStub* ic_stub = (ICStub*)buffer()->request_committed (ic_stub_code_size());
+  assert (ic_stub != NULL, "no room for a single stub");
+  set_next_stub(ic_stub);
+}
+
+void InlineCacheBuffer::initialize() {
+  if (_buffer != NULL) return; // already initialized
+  _buffer = new StubQueue(new ICStubInterface, 10*K, InlineCacheBuffer_lock, "InlineCacheBuffer");
+  assert (_buffer != NULL, "cannot allocate InlineCacheBuffer");
+  init_next_stub();
+}
+
+
+ICStub* InlineCacheBuffer::new_ic_stub() {
+  while (true) {
+    ICStub* ic_stub = (ICStub*)buffer()->request_committed(ic_stub_code_size());
+    if (ic_stub != NULL) {
+      return ic_stub;
+    }
+    // we ran out of inline cache buffer space; must enter safepoint.
+    // We do this by forcing a safepoint
+    EXCEPTION_MARK;
+
+    VM_ForceSafepoint vfs;
+    VMThread::execute(&vfs);
+    // We could potential get an async. exception at this point.
+    // In that case we will rethrow it to ourselvs.
+    if (HAS_PENDING_EXCEPTION) {
+      oop exception = PENDING_EXCEPTION;
+      CLEAR_PENDING_EXCEPTION;
+      Thread::send_async_exception(JavaThread::current()->threadObj(), exception);
+    }
+  }
+  ShouldNotReachHere();
+  return NULL;
+}
+
+
+void InlineCacheBuffer::update_inline_caches() {
+  if (buffer()->number_of_stubs() > 1) {
+    if (TraceICBuffer) {
+      tty->print_cr("[updating inline caches with %d stubs]", buffer()->number_of_stubs());
+    }
+    buffer()->remove_all();
+    init_next_stub();
+  }
+}
+
+
+bool InlineCacheBuffer::contains(address instruction_address) {
+  return buffer()->contains(instruction_address);
+}
+
+
+bool InlineCacheBuffer::is_empty() {
+  return buffer()->number_of_stubs() == 1;    // always has sentinel
+}
+
+
+void InlineCacheBuffer_init() {
+  InlineCacheBuffer::initialize();
+}
+
+
+void InlineCacheBuffer::create_transition_stub(CompiledIC *ic, oop cached_oop, address entry) {
+  assert(!SafepointSynchronize::is_at_safepoint(), "should not be called during a safepoint");
+  assert (CompiledIC_lock->is_locked(), "");
+  assert(cached_oop == NULL || cached_oop->is_perm(), "must belong to perm. space");
+  if (TraceICBuffer) { tty->print_cr("  create transition stub for " INTPTR_FORMAT, ic->instruction_address()); }
+
+  // If an transition stub is already associate with the inline cache, then we remove the association.
+  if (ic->is_in_transition_state()) {
+    ICStub* old_stub = ICStub_from_destination_address(ic->stub_address());
+    old_stub->clear();
+  }
+
+  // allocate and initialize new "out-of-line" inline-cache
+  ICStub* ic_stub = get_next_stub();
+  ic_stub->set_stub(ic, cached_oop, entry);
+
+  // Update inline cache in nmethod to point to new "out-of-line" allocated inline cache
+  ic->set_ic_destination(ic_stub->code_begin());
+
+  set_next_stub(new_ic_stub()); // can cause safepoint synchronization
+}
+
+
+address InlineCacheBuffer::ic_destination_for(CompiledIC *ic) {
+  ICStub* stub = ICStub_from_destination_address(ic->stub_address());
+  return stub->destination();
+}
+
+
+oop InlineCacheBuffer::cached_oop_for(CompiledIC *ic) {
+  ICStub* stub = ICStub_from_destination_address(ic->stub_address());
+  return stub->cached_oop();
+}