Mercurial > jdk8-mips64-public > hotspot / annotate
src/cpu/sparc/vm/icBuffer_sparc.cpp@e1162778c1c8 (annotated)
src/cpu/sparc/vm/icBuffer_sparc.cpp
Thu, 07 Apr 2011 09:53:20 -0700
- author
- johnc
- date
- Thu, 07 Apr 2011 09:53:20 -0700
- changeset 2781
- e1162778c1c8
- parent 2314
- f95d63e2154a
- child 4037
- da91efe96a93
- permissions
- -rw-r--r--
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes
| duke@435 | 1 | /* |
| stefank@2314 | 2 | * Copyright (c) 1997, 2010, 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 | |
| stefank@2314 | 25 | #include "precompiled.hpp" |
| stefank@2314 | 26 | #include "asm/assembler.hpp" |
| stefank@2314 | 27 | #include "assembler_sparc.inline.hpp" |
| stefank@2314 | 28 | #include "code/icBuffer.hpp" |
| stefank@2314 | 29 | #include "gc_interface/collectedHeap.inline.hpp" |
| stefank@2314 | 30 | #include "interpreter/bytecodes.hpp" |
| stefank@2314 | 31 | #include "memory/resourceArea.hpp" |
| stefank@2314 | 32 | #include "nativeInst_sparc.hpp" |
| stefank@2314 | 33 | #include "oops/oop.inline.hpp" |
| stefank@2314 | 34 | #include "oops/oop.inline2.hpp" |
| duke@435 | 35 | |
| duke@435 | 36 | int InlineCacheBuffer::ic_stub_code_size() { |
| duke@435 | 37 | #ifdef _LP64 |
| duke@435 | 38 | if (TraceJumps) return 600 * wordSize; |
| duke@435 | 39 | return (NativeMovConstReg::instruction_size + // sethi;add |
| duke@435 | 40 | NativeJump::instruction_size + // sethi; jmp; delay slot |
| duke@435 | 41 | (1*BytesPerInstWord) + 1); // flush + 1 extra byte |
| duke@435 | 42 | #else |
| duke@435 | 43 | if (TraceJumps) return 300 * wordSize; |
| duke@435 | 44 | return (2+2+ 1) * wordSize + 1; // set/jump_to/nop + 1 byte so that code_end can be set in CodeBuffer |
| duke@435 | 45 | #endif |
| duke@435 | 46 | } |
| duke@435 | 47 | |
| duke@435 | 48 | void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point) { |
| duke@435 | 49 | ResourceMark rm; |
| duke@435 | 50 | CodeBuffer code(code_begin, ic_stub_code_size()); |
| duke@435 | 51 | MacroAssembler* masm = new MacroAssembler(&code); |
| duke@435 | 52 | // note: even though the code contains an embedded oop, we do not need reloc info |
| duke@435 | 53 | // because |
| duke@435 | 54 | // (1) the oop is old (i.e., doesn't matter for scavenges) |
| duke@435 | 55 | // (2) these ICStubs are removed *before* a GC happens, so the roots disappear |
| duke@435 | 56 | assert(cached_oop == NULL || cached_oop->is_perm(), "must be old oop"); |
| twisti@1162 | 57 | AddressLiteral cached_oop_addrlit(cached_oop, relocInfo::none); |
| twisti@1162 | 58 | // Force the set to generate the fixed sequence so next_instruction_address works |
| twisti@1162 | 59 | masm->patchable_set(cached_oop_addrlit, G5_inline_cache_reg); |
| duke@435 | 60 | assert(G3_scratch != G5_method, "Do not clobber the method oop in the transition stub"); |
| duke@435 | 61 | assert(G3_scratch != G5_inline_cache_reg, "Do not clobber the inline cache register in the transition stub"); |
| twisti@1162 | 62 | AddressLiteral entry(entry_point); |
| twisti@1162 | 63 | masm->JUMP(entry, G3_scratch, 0); |
| duke@435 | 64 | masm->delayed()->nop(); |
| duke@435 | 65 | masm->flush(); |
| duke@435 | 66 | } |
| duke@435 | 67 | |
| duke@435 | 68 | |
| duke@435 | 69 | address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) { |
| duke@435 | 70 | NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object |
| duke@435 | 71 | NativeJump* jump = nativeJump_at(move->next_instruction_address()); |
| duke@435 | 72 | return jump->jump_destination(); |
| duke@435 | 73 | } |
| duke@435 | 74 | |
| duke@435 | 75 | |
| duke@435 | 76 | oop InlineCacheBuffer::ic_buffer_cached_oop(address code_begin) { |
| duke@435 | 77 | NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // creation also verifies the object |
| duke@435 | 78 | NativeJump* jump = nativeJump_at(move->next_instruction_address()); |
| duke@435 | 79 | return (oop)move->data(); |
| duke@435 | 80 | } |
