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[official-gcc.git] / libitm / libitm_i.h
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1 /* Copyright (C) 2008-2013 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@redhat.com>.
4 This file is part of the GNU Transactional Memory Library (libitm).
6 Libitm is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 more details.
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
25 /* The following are internal implementation functions and definitions.
26 To distinguish them from those defined by the Intel ABI, they all
27 begin with GTM/gtm. */
29 #ifndef LIBITM_I_H
30 #define LIBITM_I_H 1
32 #include "libitm.h"
33 #include "config.h"
35 #include <assert.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unwind.h>
39 #include "local_type_traits"
40 #include "local_atomic"
42 /* Don't require libgcc_s.so for exceptions. */
43 extern void _Unwind_DeleteException (_Unwind_Exception*) __attribute__((weak));
46 #include "common.h"
48 namespace GTM HIDDEN {
50 using namespace std;
52 // A helper template for accessing an unsigned integral of SIZE bytes.
53 template<size_t SIZE> struct sized_integral { };
54 template<> struct sized_integral<1> { typedef uint8_t type; };
55 template<> struct sized_integral<2> { typedef uint16_t type; };
56 template<> struct sized_integral<4> { typedef uint32_t type; };
57 template<> struct sized_integral<8> { typedef uint64_t type; };
59 typedef unsigned int gtm_word __attribute__((mode (word)));
61 // These values are given to GTM_restart_transaction and indicate the
62 // reason for the restart. The reason is used to decide what STM
63 // implementation should be used during the next iteration.
64 enum gtm_restart_reason
66 RESTART_REALLOCATE,
67 RESTART_LOCKED_READ,
68 RESTART_LOCKED_WRITE,
69 RESTART_VALIDATE_READ,
70 RESTART_VALIDATE_WRITE,
71 RESTART_VALIDATE_COMMIT,
72 RESTART_SERIAL_IRR,
73 RESTART_NOT_READONLY,
74 RESTART_CLOSED_NESTING,
75 RESTART_INIT_METHOD_GROUP,
76 NUM_RESTARTS,
77 NO_RESTART = NUM_RESTARTS
80 } // namespace GTM
82 #include "target.h"
83 #include "rwlock.h"
84 #include "aatree.h"
85 #include "cacheline.h"
86 #include "stmlock.h"
87 #include "dispatch.h"
88 #include "containers.h"
90 #ifdef __USER_LABEL_PREFIX__
91 # define UPFX UPFX1(__USER_LABEL_PREFIX__)
92 # define UPFX1(t) UPFX2(t)
93 # define UPFX2(t) #t
94 #else
95 # define UPFX
96 #endif
98 namespace GTM HIDDEN {
100 // This type is private to alloc.c, but needs to be defined so that
101 // the template used inside gtm_thread can instantiate.
102 struct gtm_alloc_action
104 void (*free_fn)(void *);
105 bool allocated;
108 struct gtm_thread;
110 // A transaction checkpoint: data that has to saved and restored when doing
111 // closed nesting.
112 struct gtm_transaction_cp
114 gtm_jmpbuf jb;
115 size_t undolog_size;
116 aa_tree<uintptr_t, gtm_alloc_action> alloc_actions;
117 size_t user_actions_size;
118 _ITM_transactionId_t id;
119 uint32_t prop;
120 uint32_t cxa_catch_count;
121 void *cxa_unthrown;
122 // We might want to use a different but compatible dispatch method for
123 // a nested transaction.
124 abi_dispatch *disp;
125 // Nesting level of this checkpoint (1 means that this is a checkpoint of
126 // the outermost transaction).
127 uint32_t nesting;
129 void save(gtm_thread* tx);
130 void commit(gtm_thread* tx);
133 // An undo log for writes.
134 struct gtm_undolog
136 vector<gtm_word> undolog;
138 // Log the previous value at a certain address.
139 // The easiest way to inline this is to just define this here.
140 void log(const void *ptr, size_t len)
142 size_t words = (len + sizeof(gtm_word) - 1) / sizeof(gtm_word);
143 gtm_word *undo = undolog.push(words + 2);
144 memcpy(undo, ptr, len);
145 undo[words] = len;
146 undo[words + 1] = (gtm_word) ptr;
149 void commit () { undolog.clear(); }
150 size_t size() const { return undolog.size(); }
152 // In local.cc
153 void rollback (gtm_thread* tx, size_t until_size = 0);
156 // An entry of a read or write log. Used by multi-lock TM methods.
157 struct gtm_rwlog_entry
159 atomic<gtm_word> *orec;
160 gtm_word value;
163 // Contains all thread-specific data required by the entire library.
164 // This includes all data relevant to a single transaction. Because most
165 // thread-specific data is about the current transaction, we also refer to
166 // the transaction-specific parts of gtm_thread as "the transaction" (the
167 // same applies to names of variables and arguments).
168 // All but the shared part of this data structure are thread-local data.
169 // gtm_thread could be split into transaction-specific structures and other
170 // per-thread data (with those parts then nested in gtm_thread), but this
171 // would make it harder to later rearrange individual members to optimize data
172 // accesses. Thus, for now we keep one flat object, and will only split it if
173 // the code gets too messy.
174 struct gtm_thread
177 struct user_action
179 _ITM_userCommitFunction fn;
180 void *arg;
181 bool on_commit;
182 _ITM_transactionId_t resuming_id;
185 // The jump buffer by which GTM_longjmp restarts the transaction.
186 // This field *must* be at the beginning of the transaction.
187 gtm_jmpbuf jb;
189 // Data used by local.c for the undo log for both local and shared memory.
190 gtm_undolog undolog;
192 // Read and write logs. Used by multi-lock TM methods.
193 vector<gtm_rwlog_entry> readlog;
194 vector<gtm_rwlog_entry> writelog;
196 // Data used by alloc.c for the malloc/free undo log.
197 aa_tree<uintptr_t, gtm_alloc_action> alloc_actions;
199 // Data used by useraction.c for the user-defined commit/abort handlers.
200 vector<user_action> user_actions;
202 // A numerical identifier for this transaction.
203 _ITM_transactionId_t id;
205 // The _ITM_codeProperties of this transaction as given by the compiler.
206 uint32_t prop;
208 // The nesting depth for subsequently started transactions. This variable
209 // will be set to 1 when starting an outermost transaction.
210 uint32_t nesting;
212 // Set if this transaction owns the serial write lock.
213 // Can be reset only when restarting the outermost transaction.
214 static const uint32_t STATE_SERIAL = 0x0001;
215 // Set if the serial-irrevocable dispatch table is installed.
216 // Implies that no logging is being done, and abort is not possible.
217 // Can be reset only when restarting the outermost transaction.
218 static const uint32_t STATE_IRREVOCABLE = 0x0002;
220 // A bitmask of the above.
221 uint32_t state;
223 // In order to reduce cacheline contention on global_tid during
224 // beginTransaction, we allocate a block of 2**N ids to the thread
225 // all at once. This number is the next value to be allocated from
226 // the block, or 0 % 2**N if no such block is allocated.
227 _ITM_transactionId_t local_tid;
229 // Data used by eh_cpp.c for managing exceptions within the transaction.
230 uint32_t cxa_catch_count;
231 void *cxa_unthrown;
232 void *eh_in_flight;
234 // Checkpoints for closed nesting.
235 vector<gtm_transaction_cp> parent_txns;
237 // Data used by retry.c for deciding what STM implementation should
238 // be used for the next iteration of the transaction.
239 // Only restart_total is reset to zero when the transaction commits, the
240 // other counters are total values for all previously executed transactions.
241 // restart_total is also used by the HTM fastpath in a different way.
242 uint32_t restart_reason[NUM_RESTARTS];
243 uint32_t restart_total;
245 // *** The shared part of gtm_thread starts here. ***
246 // Shared state is on separate cachelines to avoid false sharing with
247 // thread-local parts of gtm_thread.
249 // Points to the next thread in the list of all threads.
250 gtm_thread *next_thread __attribute__((__aligned__(HW_CACHELINE_SIZE)));
252 // If this transaction is inactive, shared_state is ~0. Otherwise, this is
253 // an active or serial transaction.
254 atomic<gtm_word> shared_state;
256 // The lock that provides access to serial mode. Non-serialized
257 // transactions acquire read locks; a serialized transaction aquires
258 // a write lock.
259 // Accessed from assembly language, thus the "asm" specifier on
260 // the name, avoiding complex name mangling.
261 static gtm_rwlock serial_lock __asm__(UPFX "gtm_serial_lock");
263 // The head of the list of all threads' transactions.
264 static gtm_thread *list_of_threads;
265 // The number of all registered threads.
266 static unsigned number_of_threads;
268 // In alloc.cc
269 void commit_allocations (bool, aa_tree<uintptr_t, gtm_alloc_action>*);
270 void record_allocation (void *, void (*)(void *));
271 void forget_allocation (void *, void (*)(void *));
272 void drop_references_allocations (const void *ptr)
274 this->alloc_actions.erase((uintptr_t) ptr);
277 // In beginend.cc
278 void rollback (gtm_transaction_cp *cp = 0, bool aborting = false);
279 bool trycommit ();
280 void restart (gtm_restart_reason, bool finish_serial_upgrade = false)
281 ITM_NORETURN;
283 gtm_thread();
284 ~gtm_thread();
286 static void *operator new(size_t);
287 static void operator delete(void *);
289 // Invoked from assembly language, thus the "asm" specifier on
290 // the name, avoiding complex name mangling.
291 static uint32_t begin_transaction(uint32_t, const gtm_jmpbuf *)
292 __asm__(UPFX "GTM_begin_transaction") ITM_REGPARM;
293 // In eh_cpp.cc
294 void revert_cpp_exceptions (gtm_transaction_cp *cp = 0);
296 // In retry.cc
297 // Must be called outside of transactions (i.e., after rollback).
298 void decide_retry_strategy (gtm_restart_reason);
299 abi_dispatch* decide_begin_dispatch (uint32_t prop);
300 void number_of_threads_changed(unsigned previous, unsigned now);
301 // Must be called from serial mode. Does not call set_abi_disp().
302 void set_default_dispatch(abi_dispatch* disp);
304 // In method-serial.cc
305 void serialirr_mode ();
307 // In useraction.cc
308 void rollback_user_actions (size_t until_size = 0);
309 void commit_user_actions ();
312 } // namespace GTM
314 #include "tls.h"
316 namespace GTM HIDDEN {
318 // An unscaled count of the number of times we should spin attempting to
319 // acquire locks before we block the current thread and defer to the OS.
320 // This variable isn't used when the standard POSIX lock implementations
321 // are used.
322 extern uint64_t gtm_spin_count_var;
324 extern "C" uint32_t GTM_longjmp (uint32_t, const gtm_jmpbuf *, uint32_t)
325 ITM_NORETURN ITM_REGPARM;
327 extern "C" void GTM_LB (const void *, size_t) ITM_REGPARM;
329 extern void GTM_error (const char *fmt, ...)
330 __attribute__((format (printf, 1, 2)));
331 extern void GTM_fatal (const char *fmt, ...)
332 __attribute__((noreturn, format (printf, 1, 2)));
334 extern abi_dispatch *dispatch_serial();
335 extern abi_dispatch *dispatch_serialirr();
336 extern abi_dispatch *dispatch_serialirr_onwrite();
337 extern abi_dispatch *dispatch_gl_wt();
338 extern abi_dispatch *dispatch_ml_wt();
339 extern abi_dispatch *dispatch_htm();
341 extern gtm_cacheline_mask gtm_mask_stack(gtm_cacheline *, gtm_cacheline_mask);
343 // Control variable for the HTM fastpath that uses serial mode as fallback.
344 // Non-zero if the HTM fastpath is enabled. See gtm_thread::begin_transaction.
345 // Accessed from assembly language, thus the "asm" specifier on
346 // the name, avoiding complex name mangling.
347 extern uint32_t htm_fastpath __asm__(UPFX "gtm_htm_fastpath");
349 } // namespace GTM
351 #endif // LIBITM_I_H