[Bug debug/28692] New: ICE in rtl_for_decl_init, at dwarf2out.c

[Bug debug/28692] New: ICE in rtl_for_decl_init, at dwarf2out.c

[micis at gmx dot de]

When I compile the small program I get an ICE.
By checking with older compiler versions I found this bug was introduced
between gcc-4.2-20060325 and gcc-4.2-20060401.

Michael Cieslinski


dwarf2out_bug.c:
    typedef float FloatVect __attribute__((__vector_size__(16)));
    static FloatVect Foo = { 250000000.0, 0.0, 0.0, 0.0};


g++42v -g dwarf2out_bug.c
dwarf2out_bug.c:1: internal compiler error: in rtl_for_decl_init, at
dwarf2out.c:9959
Please submit a full bug report, with preprocessed source if appropriate.

g++42v -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-4.2-20060729/configure --prefix=/usr/local/gcc42v
 --program-suffix=42v --with-arch=opteron --enable-languages=c,c++
 --enable-__cxa_atexit --disable-nls --enable-threads=posix
 --disable-multilib --enable-checking
Thread model: posix
gcc version 4.2.0 20060729 (experimental)


-- 
           Summary: ICE in rtl_for_decl_init, at dwarf2out.c
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: micis at gmx dot de
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ICE in rtl_for_decl_init, at|[4.2 Regression] ICE in
                   |dwarf2out.c                 |rtl_for_decl_init, at
                   |                            |dwarf2out.c
   Target Milestone|---                         |4.2.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[janis at gcc dot gnu dot org]

------- Comment #1 from janis at gcc dot gnu dot org  2006-08-11 19:27 -------
This problem also affects powerpc-linux, where a regression hunt identified the
following patch:

    http://gcc.gnu.org/viewcvs?view=rev&rev=112408

    r112408 | geoffk | 2006-03-27 06:09:48 +0000 (Mon, 27 Mar 2006)


-- 

janis at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |geoffk at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2006-08-11 19:30 -------
Confirmed.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |blocker
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|0000-00-00 00:00:00         |2006-08-11 19:30:06
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[geoffk at gcc dot gnu dot org]

------- Comment #3 from geoffk at gcc dot gnu dot org  2006-08-20 23:21 -------
As a workaround, I believe you can simply delete the gcc_assert.  This will
mean, though, that either you don't get debug information for Foo, or you will
get debug information but saying that Foo lives in the constant pool.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2006-08-21 04:32 -------
Geoff,
  Do you have a testcase where you get better debug info from your patch?
http://gcc.gnu.org/ml/gcc-patches/2006-03/msg01567.html

Thanks,
Andrew Pinski


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[geoffk at geoffk dot org]

------- Comment #5 from geoffk at geoffk dot org  2006-08-21 22:06 -------
Subject: Re:  [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c


On 20/08/2006, at 9:32 PM, pinskia at gcc dot gnu dot org wrote:

> ------- Comment #4 from pinskia at gcc dot gnu dot org  2006-08-21  
> 04:32 -------
> Geoff,
>   Do you have a testcase where you get better debug info from your  
> patch?
> http://gcc.gnu.org/ml/gcc-patches/2006-03/msg01567.html

It took me a while to find it, but here's an example:

extern void x();
static void (*f)() = x;

However, this patch is clearly not behaving the way I expected.  I  
can reproduce the reported problem on powerpc-darwin when using 'gcc - 
O -gdwarf-2'.  I'll work on a fix.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[geoffk at gcc dot gnu dot org]

-- 

geoffk at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |geoffk at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2006-08-11 19:30:06         |2006-08-21 22:08:14
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[geoffk at gcc dot gnu dot org]

------- Comment #6 from geoffk at gcc dot gnu dot org  2006-08-22 01:20 -------
It turns out that if you compile this with 'gcc -mcpu=G4 -O -gdwarf-2' on
powerpc-darwin, this testcase works fine, but if you do it with '-mcpu=G3', it
fails; that is, it fails when V4SFmode is not supported by the target.  The
testcase does correctly generate a DW_AT_const_value:

        .byte   0x7     ; uleb128 0x7; (DIE (0xa0) DW_TAG_variable)
        .ascii "Foo\0"  ; DW_AT_name
        .byte   0x1     ; DW_AT_decl_file
        .byte   0x2     ; DW_AT_decl_line
        .long   0x72    ; DW_AT_type
        .byte   0x10    ; DW_AT_const_value
        .long   0x4d6e6b28      ; fp or vector constant word 0
        .long   0x0     ; fp or vector constant word 1
        .long   0x0     ; fp or vector constant word 2
        .long   0x0     ; fp or vector constant word 3


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[geoffk at gcc dot gnu dot org]

------- Comment #7 from geoffk at gcc dot gnu dot org  2006-08-22 19:16 -------
Subject: Bug 28692

Author: geoffk
Date: Tue Aug 22 19:16:03 2006
New Revision: 116331

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=116331
Log:
Index: gcc/ChangeLog
2006-08-21  Geoffrey Keating  <geoffk@apple.com>

        PR debug/28692
        * dwarf2out.c (rtl_for_decl_init): Don't try to create RTL for
        complex values, nor for generic vector values.

Index: gcc/testsuite/ChangeLog
2006-08-21  Geoffrey Keating  <geoffk@apple.com>

        PR debug/28692
        * gcc.dg/debug/const-1.c: New.
        * gcc.dg/debug/const-2.c: New.
        * gcc.dg/debug/dwarf2/const-1.c: New.
        * gcc.dg/debug/dwarf2/const-2.c: New.
        * gcc.dg/debug/dwarf2/const-2b.c: New.

Added:
    trunk/gcc/testsuite/gcc.dg/debug/const-1.c
    trunk/gcc/testsuite/gcc.dg/debug/const-2.c
    trunk/gcc/testsuite/gcc.dg/debug/dwarf2/const-1.c
    trunk/gcc/testsuite/gcc.dg/debug/dwarf2/const-2.c
    trunk/gcc/testsuite/gcc.dg/debug/dwarf2/const-2b.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692

[Bug debug/28692] [4.2 Regression] ICE in rtl_for_decl_init, at dwarf2out.c

[geoffk at gcc dot gnu dot org]

------- Comment #8 from geoffk at gcc dot gnu dot org  2006-08-22 19:17 -------
Patch above should have fixed this.


-- 

geoffk at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28692