| /* |
| * Copyright (c) 1997, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "compiler/compileBroker.hpp" |
| #include "compiler/disassembler.hpp" |
| #include "memory/allocation.inline.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/klassVtable.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "prims/forte.hpp" |
| #include "prims/jvmtiExport.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/mutexLocker.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "utilities/align.hpp" |
| #ifdef COMPILER2 |
| #include "opto/matcher.hpp" |
| #endif |
| |
| // ----------------------------------------------------------------------------------------- |
| // Implementation of VtableStub |
| |
| address VtableStub::_chunk = NULL; |
| address VtableStub::_chunk_end = NULL; |
| VMReg VtableStub::_receiver_location = VMRegImpl::Bad(); |
| |
| |
| void* VtableStub::operator new(size_t size, int code_size) throw() { |
| assert(size == sizeof(VtableStub), "mismatched size"); |
| // compute real VtableStub size (rounded to nearest word) |
| const int real_size = align_up(code_size + (int)sizeof(VtableStub), wordSize); |
| // malloc them in chunks to minimize header overhead |
| const int chunk_factor = 32; |
| if (_chunk == NULL || _chunk + real_size > _chunk_end) { |
| const int bytes = chunk_factor * real_size + pd_code_alignment(); |
| |
| // There is a dependency on the name of the blob in src/share/vm/prims/jvmtiCodeBlobEvents.cpp |
| // If changing the name, update the other file accordingly. |
| BufferBlob* blob = BufferBlob::create("vtable chunks", bytes); |
| if (blob == NULL) { |
| return NULL; |
| } |
| _chunk = blob->content_begin(); |
| _chunk_end = _chunk + bytes; |
| Forte::register_stub("vtable stub", _chunk, _chunk_end); |
| align_chunk(); |
| } |
| assert(_chunk + real_size <= _chunk_end, "bad allocation"); |
| void* res = _chunk; |
| _chunk += real_size; |
| align_chunk(); |
| return res; |
| } |
| |
| |
| void VtableStub::print_on(outputStream* st) const { |
| st->print("vtable stub (index = %d, receiver_location = " INTX_FORMAT ", code = [" INTPTR_FORMAT ", " INTPTR_FORMAT "[)", |
| index(), p2i(receiver_location()), p2i(code_begin()), p2i(code_end())); |
| } |
| |
| |
| // ----------------------------------------------------------------------------------------- |
| // Implementation of VtableStubs |
| // |
| // For each hash value there's a linked list of vtable stubs (with that |
| // hash value). Each list is anchored in a little hash _table, indexed |
| // by that hash value. |
| |
| VtableStub* VtableStubs::_table[VtableStubs::N]; |
| int VtableStubs::_number_of_vtable_stubs = 0; |
| |
| |
| void VtableStubs::initialize() { |
| VtableStub::_receiver_location = SharedRuntime::name_for_receiver(); |
| { |
| MutexLocker ml(VtableStubs_lock); |
| assert(_number_of_vtable_stubs == 0, "potential performance bug: VtableStubs initialized more than once"); |
| assert(is_power_of_2(N), "N must be a power of 2"); |
| for (int i = 0; i < N; i++) { |
| _table[i] = NULL; |
| } |
| } |
| } |
| |
| |
| address VtableStubs::find_stub(bool is_vtable_stub, int vtable_index) { |
| assert(vtable_index >= 0, "must be positive"); |
| |
| VtableStub* s = ShareVtableStubs ? lookup(is_vtable_stub, vtable_index) : NULL; |
| if (s == NULL) { |
| if (is_vtable_stub) { |
| s = create_vtable_stub(vtable_index); |
| } else { |
| s = create_itable_stub(vtable_index); |
| } |
| |
| // Creation of vtable or itable can fail if there is not enough free space in the code cache. |
| if (s == NULL) { |
| return NULL; |
| } |
| |
| enter(is_vtable_stub, vtable_index, s); |
| if (PrintAdapterHandlers) { |
| tty->print_cr("Decoding VtableStub %s[%d]@" INTX_FORMAT, |
| is_vtable_stub? "vtbl": "itbl", vtable_index, p2i(VtableStub::receiver_location())); |
| Disassembler::decode(s->code_begin(), s->code_end()); |
| } |
| // Notify JVMTI about this stub. The event will be recorded by the enclosing |
| // JvmtiDynamicCodeEventCollector and posted when this thread has released |
| // all locks. |
| if (JvmtiExport::should_post_dynamic_code_generated()) { |
| JvmtiExport::post_dynamic_code_generated_while_holding_locks(is_vtable_stub? "vtable stub": "itable stub", |
| s->code_begin(), s->code_end()); |
| } |
| } |
| return s->entry_point(); |
| } |
| |
| |
| inline uint VtableStubs::hash(bool is_vtable_stub, int vtable_index){ |
| // Assumption: receiver_location < 4 in most cases. |
| int hash = ((vtable_index << 2) ^ VtableStub::receiver_location()->value()) + vtable_index; |
| return (is_vtable_stub ? ~hash : hash) & mask; |
| } |
| |
| |
| VtableStub* VtableStubs::lookup(bool is_vtable_stub, int vtable_index) { |
| MutexLocker ml(VtableStubs_lock); |
| unsigned hash = VtableStubs::hash(is_vtable_stub, vtable_index); |
| VtableStub* s = _table[hash]; |
| while( s && !s->matches(is_vtable_stub, vtable_index)) s = s->next(); |
| return s; |
| } |
| |
| |
| void VtableStubs::enter(bool is_vtable_stub, int vtable_index, VtableStub* s) { |
| MutexLocker ml(VtableStubs_lock); |
| assert(s->matches(is_vtable_stub, vtable_index), "bad vtable stub"); |
| unsigned int h = VtableStubs::hash(is_vtable_stub, vtable_index); |
| // enter s at the beginning of the corresponding list |
| s->set_next(_table[h]); |
| _table[h] = s; |
| _number_of_vtable_stubs++; |
| } |
| |
| |
| bool VtableStubs::is_entry_point(address pc) { |
| MutexLocker ml(VtableStubs_lock); |
| VtableStub* stub = (VtableStub*)(pc - VtableStub::entry_offset()); |
| uint hash = VtableStubs::hash(stub->is_vtable_stub(), stub->index()); |
| VtableStub* s; |
| for (s = _table[hash]; s != NULL && s != stub; s = s->next()) {} |
| return s == stub; |
| } |
| |
| |
| bool VtableStubs::contains(address pc) { |
| // simple solution for now - we may want to use |
| // a faster way if this function is called often |
| return stub_containing(pc) != NULL; |
| } |
| |
| |
| VtableStub* VtableStubs::stub_containing(address pc) { |
| // Note: No locking needed since any change to the data structure |
| // happens with an atomic store into it (we don't care about |
| // consistency with the _number_of_vtable_stubs counter). |
| for (int i = 0; i < N; i++) { |
| for (VtableStub* s = _table[i]; s != NULL; s = s->next()) { |
| if (s->contains(pc)) return s; |
| } |
| } |
| return NULL; |
| } |
| |
| void vtableStubs_init() { |
| VtableStubs::initialize(); |
| } |
| |
| void VtableStubs::vtable_stub_do(void f(VtableStub*)) { |
| for (int i = 0; i < N; i++) { |
| for (VtableStub* s = _table[i]; s != NULL; s = s->next()) { |
| f(s); |
| } |
| } |
| } |
| |
| |
| //----------------------------------------------------------------------------------------------------- |
| // Non-product code |
| #ifndef PRODUCT |
| |
| extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index) { |
| ResourceMark rm; |
| HandleMark hm; |
| Klass* klass = receiver->klass(); |
| InstanceKlass* ik = InstanceKlass::cast(klass); |
| klassVtable vt = ik->vtable(); |
| ik->print(); |
| fatal("bad compiled vtable dispatch: receiver " INTPTR_FORMAT ", " |
| "index %d (vtable length %d)", |
| p2i(receiver), index, vt.length()); |
| } |
| |
| #endif // PRODUCT |