Mercurial > hg > truffle
annotate src/share/vm/prims/jniFastGetField.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_PRIMS_JNIFASTGETFIELD_HPP |
| 26 #define SHARE_VM_PRIMS_JNIFASTGETFIELD_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "prims/jvm_misc.hpp" | |
| 30 | |
| 0 | 31 // Basic logic of a fast version of jni_Get<Primitive>Field: |
| 32 // | |
| 33 // (See safepoint.hpp for a description of _safepoint_counter) | |
| 34 // | |
| 35 // load _safepoint_counter into old_counter | |
| 36 // IF old_counter is odd THEN | |
| 37 // a safepoint is going on, return jni_GetXXXField | |
| 38 // ELSE | |
| 39 // load the primitive field value into result (speculatively) | |
| 40 // load _safepoint_counter into new_counter | |
| 41 // IF (old_counter == new_counter) THEN | |
| 42 // no safepoint happened during the field access, return result | |
| 43 // ELSE | |
| 44 // a safepoint might have happened in-between, return jni_GetXXXField() | |
| 45 // ENDIF | |
| 46 // ENDIF | |
| 47 // | |
| 48 // LoadLoad membars to maintain the load order may be necessary | |
| 49 // for some platforms. | |
| 50 // | |
| 51 // The fast versions don't check for pending suspension request. | |
| 52 // This is fine since it's totally read-only and doesn't create new race. | |
| 53 // | |
| 54 // There is a hypothetical safepoint counter wraparound. But it's not | |
| 55 // a practical concern. | |
| 56 | |
| 57 class JNI_FastGetField : AllStatic { | |
| 58 private: | |
| 59 enum { LIST_CAPACITY = 40 }; // a conservative number for the number of | |
| 60 // speculative loads on all the platforms | |
| 61 static address speculative_load_pclist []; | |
| 62 static address slowcase_entry_pclist []; | |
| 63 static int count; | |
| 64 | |
| 65 static address generate_fast_get_int_field0(BasicType type); | |
| 66 static address generate_fast_get_float_field0(BasicType type); | |
| 67 | |
| 68 public: | |
| 69 #if defined(_WINDOWS) && !defined(_WIN64) | |
| 70 static GetBooleanField_t jni_fast_GetBooleanField_fp; | |
| 71 static GetByteField_t jni_fast_GetByteField_fp; | |
| 72 static GetCharField_t jni_fast_GetCharField_fp; | |
| 73 static GetShortField_t jni_fast_GetShortField_fp; | |
| 74 static GetIntField_t jni_fast_GetIntField_fp; | |
| 75 static GetLongField_t jni_fast_GetLongField_fp; | |
| 76 static GetFloatField_t jni_fast_GetFloatField_fp; | |
| 77 static GetDoubleField_t jni_fast_GetDoubleField_fp; | |
| 78 #endif | |
| 79 | |
| 80 static address generate_fast_get_boolean_field(); | |
| 81 static address generate_fast_get_byte_field(); | |
| 82 static address generate_fast_get_char_field(); | |
| 83 static address generate_fast_get_short_field(); | |
| 84 static address generate_fast_get_int_field(); | |
| 85 static address generate_fast_get_long_field(); | |
| 86 static address generate_fast_get_float_field(); | |
| 87 static address generate_fast_get_double_field(); | |
| 88 | |
| 89 // If pc is in speculative_load_pclist, return the corresponding | |
| 90 // slow case entry pc. Otherwise, return -1. | |
| 91 // This is used by signal/exception handler to handle such case: | |
| 92 // After an even safepoint counter is loaded and a fast field access | |
| 93 // is about to begin, a GC kicks in and shrinks the heap. Then the | |
| 94 // field access may fault. The signal/exception handler needs to | |
| 95 // return to the slow case. | |
| 96 // | |
| 97 // The GC may decide to temporarily stuff some bad values into handles, | |
| 98 // for example, for debugging purpose, in which case we need the mapping also. | |
| 99 static address find_slowcase_pc(address pc); | |
| 100 }; | |
| 1972 | 101 |
| 102 #endif // SHARE_VM_PRIMS_JNIFASTGETFIELD_HPP |