[Bug c/47597] New: ICE: call frame debugging information is not handled when case is post_dec

[Bug c/47597] New: ICE: call frame debugging information is not handled when case is post_dec

[anitha.boyapati at atmel dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47597

           Summary: ICE: call frame debugging information is not handled
                    when case is post_dec
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: anitha.boyapati@atmel.com


When a register is saved onto the stack, the relevant call frame debugging
information is not recorded in dwarf2out_frame_debug_expr() when stack follows
post_dec mode. As a result, targets whose STACK_PUSH_CODE is POST_DEC. An ICE
is observed when built for AVR target. Debugging shows that gcc_unreachable()
is called in MEM case. 

The version of gcc used for testing is 4.4.3. But this support is not seen in
even the current latest version 169036 (line numbers: 2568 to 2678)

http://gcc.gnu.org/viewcvs/trunk/gcc/dwarf2out.c?revision=169036&view=markup

The host environment is  x86_64 GNU/Linux. Target build is for AVR.

[Bug c/47597] ICE: call frame debugging information is not handled when case is post_dec

[anitha.boyapati at atmel dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47597

Anitha Boyapati <anitha.boyapati at atmel dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |AVR
               Host|                            |x86_x64 GNU/Linux
            Version|unknown                     |4.4.3
             Blocks|                            |17994

--- Comment #1 from Anitha Boyapati <anitha.boyapati at atmel dot com> 2011-02-03 10:04:21 UTC ---
ICE Error:

<snip> ... -g -O2 -mmcu=avr25 -O2  -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE 
-W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual
-Wold-style-definition  -isystem ./include  -DDF=SF -Dinhibit_libc
-mcall-prologues -Os -g  -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -Dinhibit_libc 
-I. -I. -I../../.././gcc -I../../../../libgcc -I../../../../libgcc/.
-I../../../../libgcc/../gcc -I../../../../libgcc/../include   -o _mulvhi3.o -MT
_mulvhi3.o -MD -MP -MF _mulvhi3.dep -DL_mulvsi3 -c
../../../../libgcc/../gcc/libgcc2.c  \
                -DLIBGCC2_UNITS_PER_WORD=2
../../../../libgcc/../gcc/libgcc2.c: In function '__mulvhi3':
../../../../libgcc/../gcc/libgcc2.c:165: internal compiler error: in
dwarf2out_frame_debug_expr, at dwarf2out.c:2323 Please submit a full bug
report,




The bug has been explained somewhat in detail in thread:
http://gcc.gnu.org/ml/gcc/2010-12/msg00474.html as well as comment #6 of gcc
bug17994

[Bug debug/47597] ICE: call frame debugging information is not handled when case is post_dec

[anitha.boyapati at atmel dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47597

--- Comment #2 from Anitha Boyapati <anitha.boyapati at atmel dot com> 2011-06-03 07:20:44 UTC ---
Patch in trunk revision 171296

http://gcc.gnu.org/viewcvs/trunk/gcc/dwarf2out.c?r1=171150&r2=171296&diff_format=h

[Bug debug/47597] ICE: call frame debugging information is not handled when case is post_dec

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47597

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |rth at gcc dot gnu.org
            Version|4.4.3                       |4.7.0
         Resolution|                            |FIXED

--- Comment #3 from Richard Henderson <rth at gcc dot gnu.org> 2011-08-02 20:44:41 UTC ---
Fixed for 4.7.  This won't be backported to the 4.4 branch.