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From: Jeremy D. <jer...@fr...> - 2003-06-10 14:55:02
|
Hi
Here are some thoughts I had while debugging some C++ code involving
floating values. I don't know whether this has been dealt before, I
found nothing in this regard.
$pr -tn test.cxx
1 struct X { int a; };
2
3 struct Y { float a; };
4
5 struct Z { float a; short b; };
6
7 int main(int,char **)
8 {
9 X x1;
10 X x2(x1);
11
12 Y y1;
13 Y y2(y1);
14
15 Z z1;
16 Z z2(z1);
17
18 return 0;
19 }
$g++ -pedantic -W -Wall -ggdb3 test.cxx
$valgrind ./a.out
[...]
==12512==
==12512== Use of uninitialised value of size 4
==12512== at 0x80484CC: main (test.cxx:13)
==12512== by 0x402A114E: __libc_start_main (in /lib/libc-2.2.5.so)
==12512== by 0x8048400: (within /home/denise/work/valgrind/a.out)
==12512==
==12512== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0
from 0)
[...]
(One could notice that gcc did not complain about unused variables,
but that's another story.)
Lines 9-10 issue no message: according to valgrind's documentation, it
is correct (there's no "observable" effect; see memcheck 3.5.2).
The message is produced because of line 13: an uninitialized floating
value is involved, and triggers an alert during loading. Once again,
according to vg's doc, it is correct.
The problem is in lines 15-16: how comes that vg remains silent ?
A quick look at generated assembly shows:
29 .LM3:
30
31 movl -4(%ebp),%eax
32 movl %eax,-8(%ebp)
33 .LM4:
34
35 flds -12(%ebp)
36 fstps -16(%ebp)
37 .LM5:
38
39 movl -24(%ebp),%eax
40 movl -20(%ebp),%edx
41 movl %eax,-32(%ebp)
42 movl %edx,-28(%ebp)
Lines 31-32 do the work for line 10 of test.cxx; so do lines 36-36 for
line 13.
Lines 39-42 are the interesting ones: in that case, the compiler found
it better to copy Z data by the exclusive use of integer
instructions. Hence valgrind's silence.
This is, IMHO, a very undesirable behavior discontinuity. Wouldn't be
better to have valgrind complain about uninitialized floating values
in exactly the same way as with integer ones ?
-J-
|
|
From: Dominik V. <dom...@gm...> - 2003-06-10 14:40:02
|
... and the fixed ChengeLog entry: 2003-06-10 Dominik Vogt <dom...@gm...> * addrcheck/Makefile.am: * auxprogs/Makefile.am: * cachegrind/Makefile.am: * cachegrind/tests/Makefile.am: * corecheck/Makefile.am: * corecheck/tests/Makefile.am: * coregrind/Makefile.am: * coregrind/demangle/Makefile.am: * helgrind/Makefile.am: * lackey/Makefile.am: * memcheck/Makefile.am: * memcheck/tests/Makefile.am: * none/Makefile.am: * none/tests/Makefile.am: * tests/Makefile.am: use AM_CPPFLAGS, AM_CFLAGS and AM_CXXFLAGS instead of INCLUDES, CFLAGS and CXXFLAGS to allow specifying them as environment variables a la 'make CFLAGS=-O2'. moved -DVG_LIBDIR definition from CFLAGS to AM_CPPFLAGS Bye Dominik ^_^ ^_^ |
|
From: Dominik V. <dom...@gm...> - 2003-06-10 14:37:10
|
The Makefile.am's in 1.9.6 override thew user settings for CFLAGS and CXXFLAGS and use the deprecated INCLUDES automake directive. Instead they should use AM_CFLAGS, AM_CXXFLAGS and AM_CPPFLAGS (patch attached). With the patch you say $ make CFLAGS="-O2" without later compile errors. Bye Dominik ^_^ ^_^ |