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home:Alexander_Naumov:SLE-12:Update
gdb.2944
gdb-bare-DW_TAG_lexical_block-1of2.patch
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File gdb-bare-DW_TAG_lexical_block-1of2.patch of Package gdb.2944
From 3a2b436ae9958a1029545c03201b7223ff33c150 Mon Sep 17 00:00:00 2001 From: Jan Kratochvil <jan.kratochvil@redhat.com> Date: Mon, 30 May 2016 14:11:43 +0200 Subject: [PATCH 1/2] Code cleanup: dwarf2_get_pc_bounds: -1/0/+1 -> enum Make the code (maybe) more readable + primarily prepare it for [patch 2/2] enum extension. This change should have no code change impact. gdb/ChangeLog 2016-05-30 Jan Kratochvil <jan.kratochvil@redhat.com> Code cleanup: dwarf2_get_pc_bounds: -1/0/+1 -> enum * dwarf2read.c (enum pc_bounds_kind) New. (dwarf2_get_pc_bounds): Use it in the declaration. (process_psymtab_comp_unit_reader): Adjust caller. Rename has_pc_info to cu_bounds_kind. (read_func_scope, read_lexical_block_scope, read_call_site_scope): Adjust callers. (dwarf2_get_pc_bounds): Use enum pc_bounds_kind in the definition. (dwarf2_get_subprogram_pc_bounds, get_scope_pc_bounds): Adjust callers. --- gdb/ChangeLog | 12 ++++++++++ gdb/dwarf2read.c | 71 ++++++++++++++++++++++++++++++++++++-------------------- 2 files changed, 58 insertions(+), 25 deletions(-) ### a/gdb/ChangeLog ### b/gdb/ChangeLog ## -1,3 +1,15 @@ +2016-05-30 Jan Kratochvil <jan.kratochvil@redhat.com> + + Code cleanup: dwarf2_get_pc_bounds: -1/0/+1 -> enum + * dwarf2read.c (enum pc_bounds_kind) New. + (dwarf2_get_pc_bounds): Use it in the declaration. + (process_psymtab_comp_unit_reader): Adjust caller. Rename has_pc_info + to cu_bounds_kind. + (read_func_scope, read_lexical_block_scope, read_call_site_scope): + Adjust callers. + (dwarf2_get_pc_bounds): Use enum pc_bounds_kind in the definition. + (dwarf2_get_subprogram_pc_bounds, get_scope_pc_bounds): Adjust callers. + 2016-05-29 Jan Kratochvil <jan.kratochvil@redhat.com> * NEWS (QCatchSyscalls): Remove the parameter. Include ... --- a/gdb/dwarf2read.c +++ b/gdb/dwarf2read.c @@ -1606,9 +1606,25 @@ static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu); static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *, struct partial_symtab *); -static int dwarf2_get_pc_bounds (struct die_info *, - CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *, - struct partial_symtab *); +/* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return + values. */ +enum pc_bounds_kind +{ + /* No valid combination of DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges + was found. */ + PC_BOUNDS_NOT_PRESENT, + + /* Discontiguous range was found - that is DW_AT_ranges was found. */ + PC_BOUNDS_RANGES, + + /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */ + PC_BOUNDS_HIGH_LOW, +}; + +static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *, + CORE_ADDR *, CORE_ADDR *, + struct dwarf2_cu *, + struct partial_symtab *); static void get_scope_pc_bounds (struct die_info *, CORE_ADDR *, CORE_ADDR *, @@ -5947,7 +5963,7 @@ process_psymtab_comp_unit_reader (const struct die_reader_specs *reader, CORE_ADDR baseaddr; CORE_ADDR best_lowpc = 0, best_highpc = 0; struct partial_symtab *pst; - int has_pc_info; + enum pc_bounds_kind cu_bounds_kind; const char *filename; struct process_psymtab_comp_unit_data *info = (struct process_psymtab_comp_unit_data *) data; @@ -5977,9 +5993,9 @@ process_psymtab_comp_unit_reader (const struct die_reader_specs *reader, /* Possibly set the default values of LOWPC and HIGHPC from `DW_AT_ranges'. */ - has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc, - &best_highpc, cu, pst); - if (has_pc_info == 1 && best_lowpc < best_highpc) + cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc, + &best_highpc, cu, pst); + if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc) /* Store the contiguous range if it is not empty; it can be empty for CUs with no code. */ addrmap_set_empty (objfile->psymtabs_addrmap, @@ -6003,7 +6019,7 @@ process_psymtab_comp_unit_reader (const struct die_reader_specs *reader, first_die = load_partial_dies (reader, info_ptr, 1); scan_partial_symbols (first_die, &lowpc, &highpc, - ! has_pc_info, cu); + cu_bounds_kind == PC_BOUNDS_NOT_PRESENT, cu); /* If we didn't find a lowpc, set it to highpc to avoid complaints from `maint check'. */ @@ -6012,7 +6028,7 @@ process_psymtab_comp_unit_reader (const struct die_reader_specs *reader, /* If the compilation unit didn't have an explicit address range, then use the information extracted from its child dies. */ - if (! has_pc_info) + if (cu_bounds_kind == PC_BOUNDS_NOT_PRESENT) { best_lowpc = lowpc; best_highpc = highpc; @@ -11373,7 +11389,8 @@ read_func_scope (struct die_info *die, struct dwarf2_cu *cu) } /* Ignore functions with missing or invalid low and high pc attributes. */ - if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) + if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL) + == PC_BOUNDS_NOT_PRESENT) { attr = dwarf2_attr (die, DW_AT_external, cu); if (!attr || !DW_UNSND (attr)) @@ -11535,7 +11552,8 @@ read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu) as multiple lexical blocks? Handling children in a sane way would be nasty. Might be easier to properly extend generic blocks to describe ranges. */ - if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) + if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL) + == PC_BOUNDS_NOT_PRESENT) return; lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); @@ -11745,7 +11763,8 @@ read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu) CORE_ADDR lowpc; /* DW_AT_entry_pc should be preferred. */ - if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)) + if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL) + == PC_BOUNDS_NOT_PRESENT) complaint (&symfile_complaints, _("DW_AT_GNU_call_site_target target DIE has invalid " "low pc, for referencing DIE 0x%x [in module %s]"), @@ -12020,11 +12039,11 @@ dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return, return 1; } -/* Get low and high pc attributes from a die. Return 1 if the attributes - are present and valid, otherwise, return 0. Return -1 if the range is - discontinuous, i.e. derived from DW_AT_ranges information. */ +/* Get low and high pc attributes from a die. See enum pc_bounds_kind + definition for the return value. *LOWPC and *HIGHPC are set iff + PC_BOUNDS_NOT_PRESENT is not returned. */ -static int +static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, CORE_ADDR *highpc, struct dwarf2_cu *cu, struct partial_symtab *pst) @@ -12033,7 +12052,7 @@ dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, struct attribute *attr_high; CORE_ADDR low = 0; CORE_ADDR high = 0; - int ret = 0; + enum pc_bounds_kind ret = PC_BOUNDS_NOT_PRESENT; attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); if (attr_high) @@ -12048,10 +12067,10 @@ dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, } else /* Found high w/o low attribute. */ - return 0; + return PC_BOUNDS_NOT_PRESENT; /* Found consecutive range of addresses. */ - ret = 1; + ret = PC_BOUNDS_HIGH_LOW; } else { @@ -12070,15 +12089,15 @@ dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, /* Value of the DW_AT_ranges attribute is the offset in the .debug_ranges section. */ if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst)) - return 0; + return PC_BOUNDS_NOT_PRESENT; /* Found discontinuous range of addresses. */ - ret = -1; + ret = PC_BOUNDS_RANGES; } } /* read_partial_die has also the strict LOW < HIGH requirement. */ if (high <= low) - return 0; + return PC_BOUNDS_NOT_PRESENT; /* When using the GNU linker, .gnu.linkonce. sections are used to eliminate duplicate copies of functions and vtables and such. @@ -12089,7 +12108,7 @@ dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, If this is a discarded function, mark the pc bounds as invalid, so that GDB will ignore it. */ if (low == 0 && !dwarf2_per_objfile->has_section_at_zero) - return 0; + return PC_BOUNDS_NOT_PRESENT; *lowpc = low; if (highpc) @@ -12110,7 +12129,8 @@ dwarf2_get_subprogram_pc_bounds (struct die_info *die, CORE_ADDR low, high; struct die_info *child = die->child; - if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL)) + if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) + != PC_BOUNDS_NOT_PRESENT) { *lowpc = min (*lowpc, low); *highpc = max (*highpc, high); @@ -12147,7 +12167,8 @@ get_scope_pc_bounds (struct die_info *die, CORE_ADDR best_high = (CORE_ADDR) 0; CORE_ADDR current_low, current_high; - if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)) + if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL) + != PC_BOUNDS_NOT_PRESENT) { best_low = current_low; best_high = current_high; -- 2.5.5
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