Author: sewardj
Date: 2007-11-24 23:37:07 +0000 (Sat, 24 Nov 2007)
New Revision: 7207
Log:
Attempt to shake out uses of uninitialised malloc'd memory by Valgrind
itself, if such exist. Attempt failed (or no such uses exist :-)
Commit does not change any code.
Modified:
trunk/coregrind/m_mallocfree.c
Modified: trunk/coregrind/m_mallocfree.c
===================================================================
--- trunk/coregrind/m_mallocfree.c 2007-11-24 22:53:31 UTC (rev 7206)
+++ trunk/coregrind/m_mallocfree.c 2007-11-24 23:37:07 UTC (rev 7207)
@@ -1222,7 +1222,17 @@
v = get_block_payload(a, b);
vg_assert( (((Addr)v) & (VG_MIN_MALLOC_SZB-1)) == 0 );
- //zzVALGRIND_MALLOCLIKE_BLOCK(v, req_pszB, 0, False);
+ /* VALGRIND_MALLOCLIKE_BLOCK(v, req_pszB, 0, False); */
+
+ /* For debugging/testing purposes, fill the newly allocated area
+ with a definite value in an attempt to shake out any
+ uninitialised uses of the data (by V core / V tools, not by the
+ client). Testing on 25 Nov 07 with the values 0x00, 0xFF, 0x55,
+ 0xAA showed no differences in the regression tests on
+ amd64-linux. Note, is disabled by default. */
+ if (0 && aid != VG_AR_CLIENT)
+ VG_(memset)(v, 0xAA, (SizeT)req_pszB);
+
return v;
}
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