Mercurial > jdk8-mips64-public > hotspot / annotate
src/cpu/sparc/vm/c1_MacroAssembler_sparc.hpp@e1162778c1c8 (annotated)
src/cpu/sparc/vm/c1_MacroAssembler_sparc.hpp
Thu, 07 Apr 2011 09:53:20 -0700
- author
- johnc
- date
- Thu, 07 Apr 2011 09:53:20 -0700
- changeset 2781
- e1162778c1c8
- parent 2423
- b1a2afa37ec4
- child 6876
- 710a3c8b516e
- 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 | /* |
| phh@2423 | 2 | * Copyright (c) 1999, 2011, 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 | #ifndef CPU_SPARC_VM_C1_MACROASSEMBLER_SPARC_HPP |
| stefank@2314 | 26 | #define CPU_SPARC_VM_C1_MACROASSEMBLER_SPARC_HPP |
| stefank@2314 | 27 | |
| duke@435 | 28 | void pd_init() { /* nothing to do */ } |
| duke@435 | 29 | |
| duke@435 | 30 | public: |
| duke@435 | 31 | void try_allocate( |
| duke@435 | 32 | Register obj, // result: pointer to object after successful allocation |
| duke@435 | 33 | Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise |
| duke@435 | 34 | int con_size_in_bytes, // object size in bytes if known at compile time |
| duke@435 | 35 | Register t1, // temp register |
| duke@435 | 36 | Register t2, // temp register |
| duke@435 | 37 | Label& slow_case // continuation point if fast allocation fails |
| duke@435 | 38 | ); |
| duke@435 | 39 | |
| duke@435 | 40 | void initialize_header(Register obj, Register klass, Register len, Register t1, Register t2); |
| duke@435 | 41 | void initialize_body(Register base, Register index); |
| duke@435 | 42 | |
| duke@435 | 43 | // locking/unlocking |
| duke@435 | 44 | void lock_object (Register Rmark, Register Roop, Register Rbox, Register Rscratch, Label& slow_case); |
| duke@435 | 45 | void unlock_object(Register Rmark, Register Roop, Register Rbox, Label& slow_case); |
| duke@435 | 46 | |
| duke@435 | 47 | void initialize_object( |
| duke@435 | 48 | Register obj, // result: pointer to object after successful allocation |
| duke@435 | 49 | Register klass, // object klass |
| duke@435 | 50 | Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise |
| duke@435 | 51 | int con_size_in_bytes, // object size in bytes if known at compile time |
| duke@435 | 52 | Register t1, // temp register |
| duke@435 | 53 | Register t2 // temp register |
| duke@435 | 54 | ); |
| duke@435 | 55 | |
| duke@435 | 56 | // allocation of fixed-size objects |
| duke@435 | 57 | // (can also be used to allocate fixed-size arrays, by setting |
| duke@435 | 58 | // hdr_size correctly and storing the array length afterwards) |
| duke@435 | 59 | void allocate_object( |
| duke@435 | 60 | Register obj, // result: pointer to object after successful allocation |
| duke@435 | 61 | Register t1, // temp register |
| duke@435 | 62 | Register t2, // temp register |
| duke@435 | 63 | Register t3, // temp register |
| duke@435 | 64 | int hdr_size, // object header size in words |
| duke@435 | 65 | int obj_size, // object size in words |
| duke@435 | 66 | Register klass, // object klass |
| duke@435 | 67 | Label& slow_case // continuation point if fast allocation fails |
| duke@435 | 68 | ); |
| duke@435 | 69 | |
| duke@435 | 70 | enum { |
| duke@435 | 71 | max_array_allocation_length = 0x01000000 // sparc friendly value, requires sethi only |
| duke@435 | 72 | }; |
| duke@435 | 73 | |
| duke@435 | 74 | // allocation of arrays |
| duke@435 | 75 | void allocate_array( |
| duke@435 | 76 | Register obj, // result: pointer to array after successful allocation |
| duke@435 | 77 | Register len, // array length |
| duke@435 | 78 | Register t1, // temp register |
| duke@435 | 79 | Register t2, // temp register |
| duke@435 | 80 | Register t3, // temp register |
| duke@435 | 81 | int hdr_size, // object header size in words |
| duke@435 | 82 | int elt_size, // element size in bytes |
| duke@435 | 83 | Register klass, // object klass |
| duke@435 | 84 | Label& slow_case // continuation point if fast allocation fails |
| duke@435 | 85 | ); |
| duke@435 | 86 | |
| duke@435 | 87 | // invalidates registers in this window |
| duke@435 | 88 | void invalidate_registers(bool iregisters, bool lregisters, bool oregisters, |
| duke@435 | 89 | Register preserve1 = noreg, Register preserve2 = noreg); |
| stefank@2314 | 90 | |
| stefank@2314 | 91 | #endif // CPU_SPARC_VM_C1_MACROASSEMBLER_SPARC_HPP |
