1/*
2  This file is part of drd, a thread error detector.
3
4  Copyright (C) 2006-2012 Bart Van Assche <bvanassche@acm.org>.
5
6  This program is free software; you can redistribute it and/or
7  modify it under the terms of the GNU General Public License as
8  published by the Free Software Foundation; either version 2 of the
9  License, or (at your option) any later version.
10
11  This program is distributed in the hope that it will be useful, but
12  WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  General Public License for more details.
15
16  You should have received a copy of the GNU General Public License
17  along with this program; if not, write to the Free Software
18  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19  02111-1307, USA.
20
21  The GNU General Public License is contained in the file COPYING.
22*/
23
24
25#include "drd_clientobj.h"
26#include "drd_error.h"
27#include "drd_suppression.h"
28#include "pub_tool_basics.h"
29#include "pub_tool_libcassert.h"
30#include "pub_tool_libcbase.h"
31#include "pub_tool_libcprint.h"   // VG_(message)()
32#include "pub_tool_mallocfree.h"
33#include "pub_tool_options.h"     // VG_(clo_backtrace_size)
34#include "pub_tool_oset.h"
35#include "pub_tool_stacktrace.h"
36#include "pub_tool_threadstate.h" // VG_(get_running_tid)()
37
38
39/* Local variables. */
40
41static OSet* s_clientobj_set;
42static Bool s_trace_clientobj;
43
44
45/* Local functions. */
46
47static Bool clientobj_remove_obj(DrdClientobj* const p);
48
49
50/* Function definitions. */
51
52void DRD_(clientobj_set_trace)(const Bool trace)
53{
54   s_trace_clientobj = trace;
55}
56
57/** Initialize the client object set. */
58void DRD_(clientobj_init)(void)
59{
60   tl_assert(s_clientobj_set == 0);
61   s_clientobj_set = VG_(OSetGen_Create)(0, 0, VG_(malloc),
62                                         "drd.clientobj.ci.1", VG_(free));
63   tl_assert(s_clientobj_set);
64}
65
66/**
67 * Free the memory allocated for the client object set.
68 *
69 * @pre Client object set is empty.
70 */
71void DRD_(clientobj_cleanup)(void)
72{
73   tl_assert(s_clientobj_set);
74   tl_assert(VG_(OSetGen_Size)(s_clientobj_set) == 0);
75   VG_(OSetGen_Destroy)(s_clientobj_set);
76   s_clientobj_set = 0;
77}
78
79/**
80 * Return the data associated with the client object at client address addr.
81 * Return 0 if there is no client object in the set with the specified start
82 * address.
83 */
84DrdClientobj* DRD_(clientobj_get_any)(const Addr addr)
85{
86   return VG_(OSetGen_Lookup)(s_clientobj_set, &addr);
87}
88
89/**
90 * Return the data associated with the client object at client address addr
91 * and that has object type t. Return 0 if there is no client object in the
92 * set with the specified start address.
93 */
94DrdClientobj* DRD_(clientobj_get)(const Addr addr, const ObjType t)
95{
96   DrdClientobj* p;
97   p = VG_(OSetGen_Lookup)(s_clientobj_set, &addr);
98   if (p && p->any.type == t)
99      return p;
100   return 0;
101}
102
103/** Return true if and only if the address range of any client object overlaps
104 *  with the specified address range.
105 */
106Bool DRD_(clientobj_present)(const Addr a1, const Addr a2)
107{
108   DrdClientobj *p;
109
110   tl_assert(a1 <= a2);
111   VG_(OSetGen_ResetIter)(s_clientobj_set);
112   for ( ; (p = VG_(OSetGen_Next)(s_clientobj_set)) != 0; )
113   {
114      if (a1 <= p->any.a1 && p->any.a1 < a2)
115      {
116         return True;
117      }
118   }
119   return False;
120}
121
122/**
123 * Add state information for the client object at client address addr and
124 * of type t. Suppress data race reports on the address range [addr,addr+size[.
125 *
126 * @pre No other client object is present in the address range [addr,addr+size[.
127 */
128DrdClientobj* DRD_(clientobj_add)(const Addr a1, const ObjType t)
129{
130   DrdClientobj* p;
131
132   tl_assert(! DRD_(clientobj_present)(a1, a1 + 1));
133   tl_assert(VG_(OSetGen_Lookup)(s_clientobj_set, &a1) == 0);
134
135   if (s_trace_clientobj)
136      DRD_(trace_msg)("Adding client object 0x%lx of type %d", a1, t);
137
138   p = VG_(OSetGen_AllocNode)(s_clientobj_set, sizeof(*p));
139   VG_(memset)(p, 0, sizeof(*p));
140   p->any.a1   = a1;
141   p->any.type = t;
142   p->any.first_observed_at = VG_(record_ExeContext)(VG_(get_running_tid)(), 0);
143   VG_(OSetGen_Insert)(s_clientobj_set, p);
144   tl_assert(VG_(OSetGen_Lookup)(s_clientobj_set, &a1) == p);
145   if (t == ClientHbvar)
146      DRD_(mark_hbvar)(a1);
147   else
148      DRD_(start_suppression)(a1, a1 + 1, "clientobj");
149   return p;
150}
151
152/**
153 * Remove the information that was stored about the client object.
154 *
155 * @param[in] addr Address of the client object in the client address space.
156 * @param[in] t    Type of the client object.
157 */
158Bool DRD_(clientobj_remove)(const Addr addr, const ObjType t)
159{
160   DrdClientobj* p;
161
162   p = VG_(OSetGen_Lookup)(s_clientobj_set, &addr);
163   tl_assert(p);
164   tl_assert(p->any.type == t);
165   return clientobj_remove_obj(p);
166}
167
168/**
169 * Remove the information that was stored about the client object p.
170 *
171 * @note The order of operations below is important. The client object is
172 *   removed from the client object set after the cleanup function has been
173 *   called such that if the cleanup function can still use the function
174 *   DRD_(clientobj_get_any)(). This happens e.g. in the function
175 *   first_observed() in drd_error.c.
176 */
177static Bool clientobj_remove_obj(DrdClientobj* const p)
178{
179   tl_assert(p);
180
181   if (s_trace_clientobj) {
182      DRD_(trace_msg)("Removing client object 0x%lx of type %d", p->any.a1,
183                      p->any.type);
184#if 0
185      VG_(get_and_pp_StackTrace)(VG_(get_running_tid)(),
186                                 VG_(clo_backtrace_size));
187#endif
188   }
189
190   tl_assert(p->any.cleanup);
191   (*p->any.cleanup)(p);
192   VG_(OSetGen_Remove)(s_clientobj_set, &p->any.a1);
193   VG_(OSetGen_FreeNode)(s_clientobj_set, p);
194   return True;
195}
196
197/**
198 * Clean up all client objects p for which their start address p->any.a1 fits
199 * inside the address range [ a1, a2 [.
200 *
201 * @note The implementation of this function relies on the fact that the
202 *   data in s_clientobj_set is sorted on the start address of client objects.
203 */
204void DRD_(clientobj_stop_using_mem)(const Addr a1, const Addr a2)
205{
206   Addr removed_at;
207   DrdClientobj* p;
208
209   tl_assert(s_clientobj_set);
210
211   if (! DRD_(range_contains_suppression_or_hbvar)(a1, a2))
212      return;
213
214   VG_(OSetGen_ResetIterAt)(s_clientobj_set, &a1);
215   for ( ; (p = VG_(OSetGen_Next)(s_clientobj_set)) != 0 && p->any.a1 < a2; )
216   {
217      tl_assert(a1 <= p->any.a1);
218      removed_at = p->any.a1;
219      clientobj_remove_obj(p);
220      /*
221       * The above call removes an element from the oset and hence
222       * invalidates the iterator. Restore the iterator.
223       */
224      VG_(OSetGen_ResetIterAt)(s_clientobj_set, &removed_at);
225   }
226}
227
228/**
229 * Delete the per-thread information stored in client objects for the
230 * specified thread.
231 */
232void DRD_(clientobj_delete_thread)(const DrdThreadId tid)
233{
234   DrdClientobj *p;
235
236   VG_(OSetGen_ResetIter)(s_clientobj_set);
237   for ( ; (p = VG_(OSetGen_Next)(s_clientobj_set)) != 0; )
238   {
239      if (p->any.delete_thread)
240      {
241         (*p->any.delete_thread)(p, tid);
242      }
243   }
244}
245
246const char* DRD_(clientobj_type_name)(const ObjType t)
247{
248   switch (t)
249   {
250   case ClientMutex:     return "mutex";
251   case ClientCondvar:   return "cond";
252   case ClientHbvar:     return "order annotation";
253   case ClientSemaphore: return "semaphore";
254   case ClientBarrier:   return "barrier";
255   case ClientRwlock:    return "rwlock";
256   }
257   return "(unknown)";
258}
259