[Bug debug/55608] [4.6/4.7/4.8/4.9 Regression] Debug info quality regressions with file scope vars

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55608

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-03-21 20:03:19 UTC ---
Author: jakub
Date: Thu Mar 21 17:35:39 2013
New Revision: 196886

URL: http://gcc.gnu.org/viewcvs?rev=196886&root=gcc&view=rev
Log:
    PR debug/55608
    * dwarf2out.c (tree_add_const_value_attribute): Call ggc_free (array)
    on failure.
    (resolve_one_addr): Fail if referenced STRING_CST hasn't been written.
    (string_cst_pool_decl): New function.
    (optimize_one_addr_into_implicit_ptr): New function.
    (resolve_addr_in_expr): Optimize DWARF location expression
    DW_OP_addr DW_OP_stack_value where DW_OP_addr refers to some variable
    which doesn't live in memory, but has DW_AT_location or
    DW_AT_const_value, or refers to a string literal, into
    DW_OP_GNU_implicit_pointer.
    (optimize_location_into_implicit_ptr): New function.
    (resolve_addr): If removing DW_AT_location of a variable because
    it was DW_OP_addr of address of the variable, but the variable doesn't
    live in memory, try to emit const value attribute for the initializer.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c