jdk8-mips64-public/hotspot: src/cpu/sparc/vm/c1_Defs

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

     1 /*

     2  * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef CPU_SPARC_VM_C1_DEFS_SPARC_HPP

    26 #define CPU_SPARC_VM_C1_DEFS_SPARC_HPP

    28 // native word offsets from memory address (big endian)

    29 enum {

    30   pd_lo_word_offset_in_bytes = BytesPerInt,

    31   pd_hi_word_offset_in_bytes = 0

    32 };

    35 // explicit rounding operations are not required to implement the strictFP mode

    36 enum {

    37   pd_strict_fp_requires_explicit_rounding = false

    38 };

    41 // registers

    42 enum {

    43   pd_nof_cpu_regs_frame_map = 32,  // number of registers used during code emission

    44   pd_nof_caller_save_cpu_regs_frame_map = 10,  // number of cpu registers killed by calls

    45   pd_nof_cpu_regs_reg_alloc = 20,  // number of registers that are visible to register allocator

    46   pd_nof_cpu_regs_linearscan = 32,// number of registers visible linear scan

    47   pd_first_cpu_reg = 0,

    48   pd_last_cpu_reg = 31,

    49   pd_last_allocatable_cpu_reg = 19,

    50   pd_first_callee_saved_reg = 0,

    51   pd_last_callee_saved_reg = 13,

    53   pd_nof_fpu_regs_frame_map = 32,  // number of registers used during code emission

    54   pd_nof_caller_save_fpu_regs_frame_map = 32,  // number of fpu registers killed by calls

    55   pd_nof_fpu_regs_reg_alloc = 32,  // number of registers that are visible to register allocator

    56   pd_nof_fpu_regs_linearscan = 32, // number of registers visible to linear scan

    57   pd_first_fpu_reg = pd_nof_cpu_regs_frame_map,

    58   pd_last_fpu_reg =  pd_nof_cpu_regs_frame_map + pd_nof_fpu_regs_frame_map - 1,

    60   pd_nof_xmm_regs_linearscan = 0,

    61   pd_nof_caller_save_xmm_regs = 0,

    62   pd_first_xmm_reg = -1,

    63   pd_last_xmm_reg = -1

    64 };

    67 // for debug info: a float value in a register is saved in single precision by runtime stubs

    68 enum {

    69   pd_float_saved_as_double = false

    70 };

    72 #endif // CPU_SPARC_VM_C1_DEFS_SPARC_HPP

src/cpu/sparc/vm/c1_Defs_sparc.hpp@e1162778c1c8

src/cpu/sparc/vm/c1_Defs_sparc.hpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/cpu/sparc/vm/c1_Defs_sparc.hpp@e1162778c1c8

src/cpu/sparc/vm/c1_Defs_sparc.hpp