Ooodles of sexy new valgrind warnings

Dan Kegel dank at
Mon May 26 00:13:22 CDT 2008

I updated to the latest valgrind from svn, and
it gives lots of nifty new warnings.  e.g. it
warns if you are using the wrong free for a
particular memory block, and it tells you
where uninitialized blocks came from.
is a roadmap of where the sexy new stuff is; the details
are in

For instance, it says

diff -u logs-2008-05-20/vg-winmm_capture.txt
+  Uninitialised value was created by a client request
+ Mismatched free() / delete / delete []

Pulling up just that diff,
shows the latter error is
+ Mismatched free() / delete / delete []
+    at  RtlFreeHeap (heap.c:1287)
+    by  wave_in_test_device (capture.c:397)
+    by  func_capture (capture.c:716)
+    by  run_test (test.h:414)
+    by  main (test.h:463)
+  Address 0x440cc90 is 0 bytes inside a block of size 14 alloc'd
+    at  malloc (vg_replace_malloc.c:207)
+    by  wave_in_test_device (capture.c:388)
+    by  func_capture (capture.c:716)
+    by  run_test (test.h:414)
+    by  main (test.h:463)

Sure enough, memory is allocate with strdup() and freed with HeapFree(), tsk.

Anyway, there's plenty here for everybody.  Pile on!

Tomorrow I'll start running these without -O2;
Zac Brown reminded me that gives better stack tracebacks
(i.e. it inhibits inlining, which often causes small static
functions to disappear from the stack dumps in valgrind's error messages).
- Dan

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