plab.hpp (8867:8e371a1ba7df) plab.hpp (8871:91bd6ad35898)
1/*
2 * Copyright (c) 2001, 2015, 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 *

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69 void undo_last_allocation(HeapWord* obj, size_t word_sz);
70
71public:
72 // Initializes the buffer to be empty, but with the given "word_sz".
73 // Must get initialized with "set_buf" for an allocation to succeed.
74 PLAB(size_t word_sz);
75 virtual ~PLAB() {}
76
1/*
2 * Copyright (c) 2001, 2015, 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 *

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69 void undo_last_allocation(HeapWord* obj, size_t word_sz);
70
71public:
72 // Initializes the buffer to be empty, but with the given "word_sz".
73 // Must get initialized with "set_buf" for an allocation to succeed.
74 PLAB(size_t word_sz);
75 virtual ~PLAB() {}
76
77 static size_t size_required_for_allocation(size_t word_size) { return word_size + AlignmentReserve; }
78
77 // Minimum PLAB size.
78 static size_t min_size();
79 // Maximum PLAB size.
80 static size_t max_size();
81
82 // If an allocation of the given "word_sz" can be satisfied within the
83 // buffer, do the allocation, returning a pointer to the start of the
84 // allocated block. If the allocation request cannot be satisfied,

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102
103 // The total (word) size of the buffer, including both allocated and
104 // unallocated space.
105 size_t word_sz() { return _word_sz; }
106
107 size_t waste() { return _wasted; }
108 size_t undo_waste() { return _undo_wasted; }
109
79 // Minimum PLAB size.
80 static size_t min_size();
81 // Maximum PLAB size.
82 static size_t max_size();
83
84 // If an allocation of the given "word_sz" can be satisfied within the
85 // buffer, do the allocation, returning a pointer to the start of the
86 // allocated block. If the allocation request cannot be satisfied,

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104
105 // The total (word) size of the buffer, including both allocated and
106 // unallocated space.
107 size_t word_sz() { return _word_sz; }
108
109 size_t waste() { return _wasted; }
110 size_t undo_waste() { return _undo_wasted; }
111
110 // Should only be done if we are about to reset with a new buffer of the
111 // given size.
112 void set_word_size(size_t new_word_sz) {
113 assert(new_word_sz > AlignmentReserve, "Too small");
114 _word_sz = new_word_sz;
115 }
116
117 // The number of words of unallocated space remaining in the buffer.
118 size_t words_remaining() {
119 assert(_end >= _top, "Negative buffer");
120 return pointer_delta(_end, _top, HeapWordSize);
121 }
122
123 bool contains(void* addr) {
124 return (void*)_bottom <= addr && addr < (void*)_hard_end;
125 }
126
127 // Sets the space of the buffer to be [buf, space+word_sz()).
112 // The number of words of unallocated space remaining in the buffer.
113 size_t words_remaining() {
114 assert(_end >= _top, "Negative buffer");
115 return pointer_delta(_end, _top, HeapWordSize);
116 }
117
118 bool contains(void* addr) {
119 return (void*)_bottom <= addr && addr < (void*)_hard_end;
120 }
121
122 // Sets the space of the buffer to be [buf, space+word_sz()).
128 virtual void set_buf(HeapWord* buf) {
123 virtual void set_buf(HeapWord* buf, size_t new_word_sz) {
124 assert(new_word_sz > AlignmentReserve, "Too small");
125 _word_sz = new_word_sz;
126
129 _bottom = buf;
130 _top = _bottom;
131 _hard_end = _bottom + word_sz();
132 _end = _hard_end - AlignmentReserve;
133 assert(_end >= _top, "Negative buffer");
134 // In support of ergonomic sizing
135 _allocated += word_sz();
136 }

--- 67 unchanged lines hidden --- 		127 _bottom = buf;
128 _top = _bottom;
129 _hard_end = _bottom + word_sz();
130 _end = _hard_end - AlignmentReserve;
131 assert(_end >= _top, "Negative buffer");
132 // In support of ergonomic sizing
133 _allocated += word_sz();
134 }

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