[Bug debug/48220] DW_OP_GNU_entry_value/DW_TAG_GNU_call_site_parameter vs register window

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48220

--- Comment #10 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-07-15 17:10:00 UTC ---
Author: ebotcazou
Date: Fri Jul 15 17:09:56 2011
New Revision: 176318

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176318
Log:
    PR target/48220
    * doc/md.texi (Standard Names): Document window_save.
    * cfgexpand.c (expand_debug_parm_decl): New function extracted from
    expand_debug_expr and expand_debug_source_expr.  If the target has
    a window_save instruction, adjust the ENTRY_VALUE_EXP.
    (expand_debug_expr) <SSA_NAME>: Call expand_debug_parm_decl if the
    SSA_NAME_VAR is a parameter.
    (expand_debug_source_expr) <PARM_DECL>: Call expand_debug_parm_decl.
    * var-tracking.c (parm_reg_t): New type and associated vector type.
    (windowed_parm_regs): New variable.
    (adjust_insn): If the target has a window_save instruction and this
    is the instruction, make its effect on parameter registers explicit.
    (next_non_note_insn_var_location): New function.
    (emit_notes_in_bb): Use it instead of NEXT_INSN throughout.
    (vt_add_function_parameter): If the target has a window_save insn,
    adjust the incoming RTL and record that in windowed_parm_regs.
    (vt_finalize): Free windowed_parm_regs.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cfgexpand.c
    trunk/gcc/doc/md.texi
    trunk/gcc/var-tracking.c