Mercurial > hg > truffle
annotate src/share/vm/code/stubs.hpp @ 17387:0e120f2819ce
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author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 09 Oct 2014 13:19:31 +0200 |
parents | 4ca6dc0799b6 |
children | 89152779163c |
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0 | 1 /* |
14909 | 2 * Copyright (c) 1997, 2012, 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_CODE_STUBS_HPP |
26 #define SHARE_VM_CODE_STUBS_HPP | |
27 | |
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28 #include "asm/codeBuffer.hpp" |
1972 | 29 #include "memory/allocation.hpp" |
30 #ifdef TARGET_OS_FAMILY_linux | |
31 # include "os_linux.inline.hpp" | |
32 #endif | |
33 #ifdef TARGET_OS_FAMILY_solaris | |
34 # include "os_solaris.inline.hpp" | |
35 #endif | |
36 #ifdef TARGET_OS_FAMILY_windows | |
37 # include "os_windows.inline.hpp" | |
38 #endif | |
3960 | 39 #ifdef TARGET_OS_FAMILY_bsd |
40 # include "os_bsd.inline.hpp" | |
41 #endif | |
1972 | 42 |
0 | 43 // The classes in this file provide a simple framework for the |
44 // management of little pieces of machine code - or stubs - | |
45 // created on the fly and frequently discarded. In this frame- | |
46 // work stubs are stored in a queue. | |
47 | |
48 | |
49 // Stub serves as abstract base class. A concrete stub | |
50 // implementation is a subclass of Stub, implementing | |
51 // all (non-virtual!) functions required sketched out | |
52 // in the Stub class. | |
53 // | |
54 // A concrete stub layout may look like this (both data | |
55 // and code sections could be empty as well): | |
56 // | |
57 // ________ | |
58 // stub -->| | <--+ | |
59 // | data | | | |
60 // |________| | | |
61 // code_begin -->| | | | |
62 // | | | | |
63 // | code | | size | |
64 // | | | | |
65 // |________| | | |
66 // code_end -->| | | | |
67 // | data | | | |
68 // |________| | | |
69 // <--+ | |
70 | |
71 | |
72 class Stub VALUE_OBJ_CLASS_SPEC { | |
73 public: | |
74 // Initialization/finalization | |
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75 void initialize(int size, |
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76 CodeStrings& strings) { ShouldNotCallThis(); } // called to initialize/specify the stub's size |
0 | 77 void finalize() { ShouldNotCallThis(); } // called before the stub is deallocated |
78 | |
79 // General info/converters | |
80 int size() const { ShouldNotCallThis(); return 0; } // must return the size provided by initialize | |
81 static int code_size_to_size(int code_size) { ShouldNotCallThis(); return 0; } // computes the size given the code size | |
82 | |
83 // Code info | |
84 address code_begin() const { ShouldNotCallThis(); return NULL; } // points to the first byte of the code | |
85 address code_end() const { ShouldNotCallThis(); return NULL; } // points to the first byte after the code | |
86 | |
87 // Debugging | |
88 void verify() { ShouldNotCallThis(); } // verifies the Stub | |
89 void print() { ShouldNotCallThis(); } // prints some information about the stub | |
90 }; | |
91 | |
92 | |
93 // A stub interface defines the interface between a stub queue | |
94 // and the stubs it queues. In order to avoid a vtable and | |
95 // (and thus the extra word) in each stub, a concrete stub | |
96 // interface object is created and associated with a stub | |
97 // buffer which in turn uses the stub interface to interact | |
98 // with its stubs. | |
99 // | |
100 // StubInterface serves as an abstract base class. A concrete | |
101 // stub interface implementation is a subclass of StubInterface, | |
102 // forwarding its virtual function calls to non-virtual calls | |
103 // of the concrete stub (see also macro below). There's exactly | |
104 // one stub interface instance required per stub queue. | |
105 | |
6197 | 106 class StubInterface: public CHeapObj<mtCode> { |
0 | 107 public: |
108 // Initialization/finalization | |
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109 virtual void initialize(Stub* self, int size, |
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110 CodeStrings& strings) = 0; // called after creation (called twice if allocated via (request, commit)) |
0 | 111 virtual void finalize(Stub* self) = 0; // called before deallocation |
112 | |
113 // General info/converters | |
114 virtual int size(Stub* self) const = 0; // the total size of the stub in bytes (must be a multiple of CodeEntryAlignment) | |
115 virtual int code_size_to_size(int code_size) const = 0; // computes the total stub size in bytes given the code size in bytes | |
116 | |
117 // Code info | |
118 virtual address code_begin(Stub* self) const = 0; // points to the first code byte | |
119 virtual address code_end(Stub* self) const = 0; // points to the first byte after the code | |
120 | |
121 // Debugging | |
122 virtual void verify(Stub* self) = 0; // verifies the stub | |
123 virtual void print(Stub* self) = 0; // prints information about the stub | |
124 }; | |
125 | |
126 | |
127 // DEF_STUB_INTERFACE is used to create a concrete stub interface | |
128 // class, forwarding stub interface calls to the corresponding | |
129 // stub calls. | |
130 | |
131 #define DEF_STUB_INTERFACE(stub) \ | |
132 class stub##Interface: public StubInterface { \ | |
133 private: \ | |
134 static stub* cast(Stub* self) { return (stub*)self; } \ | |
135 \ | |
136 public: \ | |
137 /* Initialization/finalization */ \ | |
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138 virtual void initialize(Stub* self, int size, \ |
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139 CodeStrings& strings) { cast(self)->initialize(size, strings); } \ |
0 | 140 virtual void finalize(Stub* self) { cast(self)->finalize(); } \ |
141 \ | |
142 /* General info */ \ | |
143 virtual int size(Stub* self) const { return cast(self)->size(); } \ | |
144 virtual int code_size_to_size(int code_size) const { return stub::code_size_to_size(code_size); } \ | |
145 \ | |
146 /* Code info */ \ | |
147 virtual address code_begin(Stub* self) const { return cast(self)->code_begin(); } \ | |
148 virtual address code_end(Stub* self) const { return cast(self)->code_end(); } \ | |
149 \ | |
150 /* Debugging */ \ | |
151 virtual void verify(Stub* self) { cast(self)->verify(); } \ | |
152 virtual void print(Stub* self) { cast(self)->print(); } \ | |
153 }; | |
154 | |
155 | |
156 // A StubQueue maintains a queue of stubs. | |
157 // Note: All sizes (spaces) are given in bytes. | |
158 | |
6197 | 159 class StubQueue: public CHeapObj<mtCode> { |
0 | 160 friend class VMStructs; |
161 private: | |
162 StubInterface* _stub_interface; // the interface prototype | |
163 address _stub_buffer; // where all stubs are stored | |
164 int _buffer_size; // the buffer size in bytes | |
165 int _buffer_limit; // the (byte) index of the actual buffer limit (_buffer_limit <= _buffer_size) | |
166 int _queue_begin; // the (byte) index of the first queue entry (word-aligned) | |
167 int _queue_end; // the (byte) index of the first entry after the queue (word-aligned) | |
168 int _number_of_stubs; // the number of buffered stubs | |
169 Mutex* const _mutex; // the lock used for a (request, commit) transaction | |
170 | |
171 void check_index(int i) const { assert(0 <= i && i < _buffer_limit && i % CodeEntryAlignment == 0, "illegal index"); } | |
172 bool is_contiguous() const { return _queue_begin <= _queue_end; } | |
173 int index_of(Stub* s) const { int i = (address)s - _stub_buffer; check_index(i); return i; } | |
174 Stub* stub_at(int i) const { check_index(i); return (Stub*)(_stub_buffer + i); } | |
175 Stub* current_stub() const { return stub_at(_queue_end); } | |
176 | |
177 // Stub functionality accessed via interface | |
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178 void stub_initialize(Stub* s, int size, |
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179 CodeStrings& strings) { assert(size % CodeEntryAlignment == 0, "size not aligned"); _stub_interface->initialize(s, size, strings); } |
0 | 180 void stub_finalize(Stub* s) { _stub_interface->finalize(s); } |
181 int stub_size(Stub* s) const { return _stub_interface->size(s); } | |
182 bool stub_contains(Stub* s, address pc) const { return _stub_interface->code_begin(s) <= pc && pc < _stub_interface->code_end(s); } | |
183 int stub_code_size_to_size(int code_size) const { return _stub_interface->code_size_to_size(code_size); } | |
184 void stub_verify(Stub* s) { _stub_interface->verify(s); } | |
185 void stub_print(Stub* s) { _stub_interface->print(s); } | |
186 | |
187 static void register_queue(StubQueue*); | |
188 | |
189 public: | |
190 StubQueue(StubInterface* stub_interface, int buffer_size, Mutex* lock, | |
191 const char* name); | |
192 ~StubQueue(); | |
193 | |
194 // General queue info | |
195 bool is_empty() const { return _queue_begin == _queue_end; } | |
196 int total_space() const { return _buffer_size - 1; } | |
197 int available_space() const { int d = _queue_begin - _queue_end - 1; return d < 0 ? d + _buffer_size : d; } | |
198 int used_space() const { return total_space() - available_space(); } | |
199 int number_of_stubs() const { return _number_of_stubs; } | |
200 bool contains(address pc) const { return _stub_buffer <= pc && pc < _stub_buffer + _buffer_limit; } | |
201 Stub* stub_containing(address pc) const; | |
202 address code_start() const { return _stub_buffer; } | |
203 address code_end() const { return _stub_buffer + _buffer_limit; } | |
204 | |
205 // Stub allocation (atomic transactions) | |
206 Stub* request_committed(int code_size); // request a stub that provides exactly code_size space for code | |
207 Stub* request(int requested_code_size); // request a stub with a (maximum) code space - locks the queue | |
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208 void commit (int committed_code_size, |
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209 CodeStrings& strings); // commit the previously requested stub - unlocks the queue |
0 | 210 |
211 // Stub deallocation | |
212 void remove_first(); // remove the first stub in the queue | |
213 void remove_first(int n); // remove the first n stubs in the queue | |
214 void remove_all(); // remove all stubs in the queue | |
215 | |
216 // Iteration | |
217 static void queues_do(void f(StubQueue* s)); // call f with each StubQueue | |
218 void stubs_do(void f(Stub* s)); // call f with all stubs | |
219 Stub* first() const { return number_of_stubs() > 0 ? stub_at(_queue_begin) : NULL; } | |
220 Stub* next(Stub* s) const { int i = index_of(s) + stub_size(s); | |
221 if (i == _buffer_limit) i = 0; | |
222 return (i == _queue_end) ? NULL : stub_at(i); | |
223 } | |
224 | |
225 address stub_code_begin(Stub* s) const { return _stub_interface->code_begin(s); } | |
226 address stub_code_end(Stub* s) const { return _stub_interface->code_end(s); } | |
227 | |
228 // Debugging/printing | |
229 void verify(); // verifies the stub queue | |
230 void print(); // prints information about the stub queue | |
231 }; | |
1972 | 232 |
233 #endif // SHARE_VM_CODE_STUBS_HPP |