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From: <sv...@va...> - 2016-01-16 21:44:38
|
Author: florian
Date: Sat Jan 16 21:44:31 2016
New Revision: 15761
Log:
In ML_(am_allocate_segname) do not set the reference count of the
slot to 1. Rather do that in add_segment which is where the segment
refering to that name actually comes into existence.
Properly handle the case in add_segment where the to-be-added segment
and one (or more) of the segments it replaces have the same name
This may occur when doing a mremap.
Modified:
trunk/coregrind/m_aspacemgr/aspacemgr-linux.c
trunk/coregrind/m_aspacemgr/aspacemgr-segnames.c
Modified: trunk/coregrind/m_aspacemgr/aspacemgr-linux.c
==============================================================================
--- trunk/coregrind/m_aspacemgr/aspacemgr-linux.c (original)
+++ trunk/coregrind/m_aspacemgr/aspacemgr-linux.c Sat Jan 16 21:44:31 2016
@@ -1445,6 +1445,15 @@
split_nsegments_lo_and_hi( sStart, sEnd, &iLo, &iHi );
+ /* Increase the reference count of SEG's name. We need to do this
+ *before* decreasing the reference count of the names of the replaced
+ segments. Consider the case where the segment name of SEG and one of
+ the replaced segments are the same. If the refcount of that name is 1,
+ then decrementing first would put the slot for that name on the free
+ list. Attempting to increment the refcount later would then fail
+ because the slot is no longer allocated. */
+ ML_(am_inc_refcount)(seg->fnIdx);
+
/* Now iLo .. iHi inclusive is the range of segment indices which
seg will replace. If we're replacing more than one segment,
slide those above the range down to fill the hole. Before doing
Modified: trunk/coregrind/m_aspacemgr/aspacemgr-segnames.c
==============================================================================
--- trunk/coregrind/m_aspacemgr/aspacemgr-segnames.c (original)
+++ trunk/coregrind/m_aspacemgr/aspacemgr-segnames.c Sat Jan 16 21:44:31 2016
@@ -309,7 +309,7 @@
freeslot_chain = next_freeslot;
else
put_slotindex(prev, next_freeslot);
- put_refcount(ix, 1);
+ put_refcount(ix, 0);
put_slotsize(ix, size);
VG_(strcpy)(segnames + ix, name);
++num_segnames;
@@ -336,7 +336,7 @@
/* copy it in */
ix = segnames_used;
- put_refcount(ix, 1);
+ put_refcount(ix, 0);
put_slotsize(ix, len + 1);
VG_(strcpy)(segnames + ix, name);
segnames_used += need;
|
|
From: <sv...@va...> - 2016-01-16 21:13:05
|
Author: florian
Date: Sat Jan 16 21:12:57 2016
New Revision: 15760
Log:
Remove code that has no effect. Looks like a leftover from early
debugging days.
Modified:
trunk/coregrind/m_aspacemgr/aspacemgr-segnames.c
Modified: trunk/coregrind/m_aspacemgr/aspacemgr-segnames.c
==============================================================================
--- trunk/coregrind/m_aspacemgr/aspacemgr-segnames.c (original)
+++ trunk/coregrind/m_aspacemgr/aspacemgr-segnames.c Sat Jan 16 21:12:57 2016
@@ -250,9 +250,7 @@
UInt size = get_slotsize(ix);
/* Chain this slot in the freelist */
put_slotindex(ix, freeslot_chain);
- get_slotindex(ix);
put_slotsize(ix + slotsize_size, size);
- get_slotindex(ix);
freeslot_chain = ix;
--num_segnames;
if (0) VG_(am_show_nsegments)(0, "AFTER DECREASE rc -> 0");
|