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gcc34-frame-base-loclist.patch
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File gcc34-frame-base-loclist.patch of Package gcc3
2006-05-19 Jakub Jelinek <jakub@redhat.com> * dwarf2out.c (gen_subprogram_die): If -fno-frame-base-loclist, set frame base to hard fp or stack pointer. * toplev.c (flag_frame_base_loclist): New variable. (f_options): Add -fframe-base-loclist. * flags.h (flag_frame_base_loclist): New extern. * common.opt (frame-base-loclist): New flag. * opts.c (common_handle_option): Handle -f{,no-}frame-base-loclist. --- gcc/dwarf2out.c.jj 2006-05-15 14:02:35.000000000 +0200 +++ gcc/dwarf2out.c 2006-05-15 14:21:40.000000000 +0200 @@ -11389,33 +11389,35 @@ gen_subprogram_die (tree decl, dw_die_re #endif #ifdef DWARF2_UNWIND_INFO - /* We define the "frame base" as the function's CFA. This is more - convenient for several reasons: (1) It's stable across the prologue - and epilogue, which makes it better than just a frame pointer, - (2) With dwarf3, there exists a one-byte encoding that allows us - to reference the .debug_frame data by proxy, but failing that, - (3) We can at least reuse the code inspection and interpretation - code that determines the CFA position at various points in the - function. */ - /* ??? Use some command-line or configury switch to enable the use - of dwarf3 DW_OP_call_frame_cfa. At present there are no dwarf - consumers that understand it; fall back to "pure" dwarf2 and - convert the CFA data into a location list. */ - { - dw_loc_list_ref list = convert_cfa_to_loc_list (); - if (list->dw_loc_next) - add_AT_loc_list (subr_die, DW_AT_frame_base, list); - else - add_AT_loc (subr_die, DW_AT_frame_base, list->expr); - } + if (flag_frame_base_loclist) + { + /* We define the "frame base" as the function's CFA. This is more + convenient for several reasons: (1) It's stable across the prologue + and epilogue, which makes it better than just a frame pointer, + (2) With dwarf3, there exists a one-byte encoding that allows us + to reference the .debug_frame data by proxy, but failing that, + (3) We can at least reuse the code inspection and interpretation + code that determines the CFA position at various points in the + function. */ + /* ??? Use some command-line or configury switch to enable the use + of dwarf3 DW_OP_call_frame_cfa. At present there are no dwarf + consumers that understand it; fall back to "pure" dwarf2 and + convert the CFA data into a location list. */ + dw_loc_list_ref list = convert_cfa_to_loc_list (); + if (list->dw_loc_next) + add_AT_loc_list (subr_die, DW_AT_frame_base, list); + else + add_AT_loc (subr_die, DW_AT_frame_base, list->expr); - /* Compute a displacement from the "steady-state frame pointer" to - the CFA. The former is what all stack slots and argument slots - will reference in the rtl; the later is what we've told the - debugger about. We'll need to adjust all frame_base references - by this displacement. */ - compute_frame_pointer_to_cfa_displacement (); -#else + /* Compute a displacement from the "steady-state frame pointer" to + the CFA. The former is what all stack slots and argument slots + will reference in the rtl; the later is what we've told the + debugger about. We'll need to adjust all frame_base references + by this displacement. */ + compute_frame_pointer_to_cfa_displacement (); + } + else +#endif /* For targets which support DWARF2, but not DWARF2 call-frame info, we just use the stack pointer or frame pointer. */ /* ??? Should investigate getting better info via callbacks, or else @@ -11425,7 +11427,6 @@ gen_subprogram_die (tree decl, dw_die_re = frame_pointer_needed ? hard_frame_pointer_rtx : stack_pointer_rtx; add_AT_loc (subr_die, DW_AT_frame_base, reg_loc_descriptor (fp_reg)); } -#endif #if 0 /* ??? This fails for nested inline functions, because context_display --- gcc/toplev.c.jj 2005-11-21 14:55:43.000000000 +0100 +++ gcc/toplev.c 2006-05-15 14:25:14.000000000 +0200 @@ -961,6 +961,10 @@ int flag_tracer = 0; int flag_unit_at_a_time = 0; +/* Nonzero if DWARF2 DW_AT_frame_base can be a location list. */ + +int flag_frame_base_loclist = 1; + /* Nonzero if we should track variables. When flag_var_tracking == AUTODETECT_FLAG_VAR_TRACKING it will be set according to optimize, debug_info_level and debug_hooks in process_options (). */ @@ -1165,7 +1169,8 @@ static const lang_independent_options f_ { "trapv", &flag_trapv, 1 }, { "wrapv", &flag_wrapv, 1 }, { "new-ra", &flag_new_regalloc, 1 }, - { "var-tracking", &flag_var_tracking, 1} + { "var-tracking", &flag_var_tracking, 1}, + { "frame-base-loclist", &flag_frame_base_loclist, 1} }; /* Here is a table, controlled by the tm.h file, listing each -m switch --- gcc/flags.h.jj 2005-11-21 14:43:20.000000000 +0100 +++ gcc/flags.h 2006-05-15 14:25:06.000000000 +0200 @@ -746,6 +746,9 @@ extern int flag_remove_unreachable_funct /* Nonzero if we should track variables. */ extern int flag_var_tracking; +/* Nonzero if DWARF2 DW_AT_frame_base can be a location list. */ +extern int flag_frame_base_loclist; + /* A string that's used when a random name is required. NULL means to make it really random. */ --- gcc/common.opt.jj 2005-11-21 08:43:20.000000000 -0500 +++ gcc/common.opt 2006-05-19 06:24:09.000000000 -0400 @@ -718,6 +718,10 @@ fvar-tracking Common Perform variable tracking +fframe-base-loclist +Common +Allow use of DWARF2 location lists for frame base + fverbose-asm Common Add extra commentary to assembler output --- gcc/opts.c.jj 2005-11-21 08:43:21.000000000 -0500 +++ gcc/opts.c 2006-05-19 06:26:26.000000000 -0400 @@ -1461,6 +1461,10 @@ common_handle_option (size_t scode, cons flag_var_tracking = value; break; + case OPT_fframe_base_loclist: + flag_frame_base_loclist = value; + break; + case OPT_fverbose_asm: flag_verbose_asm = value; break;
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