[Bug debug/43540] ICE: vector VEC(dw_cfi_ref,heap) grow domain error, in output_cfis at dwarf2out.c:3346 or OOM-killed

[jakub at gcc dot gnu dot org]

------- Comment #7 from jakub at gcc dot gnu dot org  2010-03-26 15:51 -------
Created an attachment (id=20214)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20214&action=view)
gcc45-pr43540.patch

Ah, finally managed to reproduce it.  The problem seems to be in confusion
about the operand order for DW_CFA_expression.  The code that creates
DW_CFA_expression as well as the consumers were using operand1 for location and
operand2 for regnum, while in DWARF standard DW_CFA_expression has first
argument regnum and second block, and I assumed that too when writing
output_cfis.  While changing output_cfis would be probably tiny bit shorter, I
think it is really terribly confusing and a maintainance nightmare if
DW_CFA_expression is the only code where the order of operands in GCC internal
representation doesn't match the order of operands emitted.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |jakub at gcc dot gnu dot org
                   |dot org                     |
             Status|UNCONFIRMED                 |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43540