Mercurial > hg > graal-compiler
view src/cpu/zero/vm/assembler_zero.cpp @ 11825:463f51256c86
AMD64HotSpot: emit jump to IC miss handler directly instead of emitting it inside verfied_entry
for empty methods we emitted something like this if a inline cache is needed:
prefix:
00: < IC check >
...
0b: jne <ic_miss_call>
11: nop
...
verified_entry:
20: ret
ic_miss_call:
21: jmp <entry of runtime function>
when a method is deoptimized, HotSpot patches the verified_entry (0x20) with a
jump to a stub that handles call-sites that has been made non-entrant. since this jump
is 5 bytes long, it will overwrite ic_miss_call and blow up every caller that
calls this method via the unverified entry (prefix).
the fix is to emit the jump to the runtime function inside the unverfied entry:
prefix:
00: < IC check >
...
0b: je <verified_entry>
11: jeq <entry of runtime function>
16: nop
...
verified_entry:
20: ret
author | Bernhard Urban <bernhard.urban@jku.at> |
---|---|
date | Mon, 30 Sep 2013 09:32:18 +0200 |
parents | db9981fd3124 |
children | e16282db4946 |
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/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. * Copyright 2007, 2008, 2009 Red Hat, Inc. * 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 "assembler_zero.inline.hpp" #include "gc_interface/collectedHeap.inline.hpp" #include "interpreter/interpreter.hpp" #include "memory/cardTableModRefBS.hpp" #include "memory/resourceArea.hpp" #include "prims/methodHandles.hpp" #include "runtime/biasedLocking.hpp" #include "runtime/interfaceSupport.hpp" #include "runtime/objectMonitor.hpp" #include "runtime/os.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/stubRoutines.hpp" #include "utilities/macros.hpp" #if INCLUDE_ALL_GCS #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" #include "gc_implementation/g1/heapRegion.hpp" #endif // INCLUDE_ALL_GCS int AbstractAssembler::code_fill_byte() { return 0; } #ifdef ASSERT bool AbstractAssembler::pd_check_instruction_mark() { ShouldNotCallThis(); } #endif void Assembler::pd_patch_instruction(address branch, address target) { ShouldNotCallThis(); } void MacroAssembler::align(int modulus) { while (offset() % modulus != 0) emit_int8(AbstractAssembler::code_fill_byte()); } void MacroAssembler::bang_stack_with_offset(int offset) { ShouldNotCallThis(); } void MacroAssembler::advance(int bytes) { code_section()->set_end(code_section()->end() + bytes); } RegisterOrConstant MacroAssembler::delayed_value_impl( intptr_t* delayed_value_addr, Register tmpl, int offset) { ShouldNotCallThis(); } void MacroAssembler::store_oop(jobject obj) { code_section()->relocate(pc(), oop_Relocation::spec_for_immediate()); emit_address((address) obj); } void MacroAssembler::store_Metadata(Metadata* md) { code_section()->relocate(pc(), metadata_Relocation::spec_for_immediate()); emit_address((address) md); } static void should_not_call() { report_should_not_call(__FILE__, __LINE__); } address ShouldNotCallThisStub() { return (address) should_not_call; } address ShouldNotCallThisEntry() { return (address) should_not_call; }