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Disable epilogue unwinders on recent GCCs.
	* amd64-tdep.c (amd64_in_function_epilogue_p): New variable symtab,
	initialize it, return 0 on EPILOGUE_UNWIND_VALID.
	* dwarf2read.c (process_full_comp_unit): Initialize
	EPILOGUE_UNWIND_VALID.
	* i386-tdep.c (i386_in_function_epilogue_p): New variable symtab,
	initialize it, return 0 on EPILOGUE_UNWIND_VALID.
	* symtab.h (struct symtab): New field epilogue_unwind_valid.
This commit is contained in:
Jan Kratochvil 2011-06-29 22:19:24 +00:00
parent 4632c0d0ff
commit e0d00bc749
5 changed files with 29 additions and 0 deletions
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11
gdb/ChangeLog
View file

@ -1,3 +1,14 @@
2011-06-29 Jan Kratochvil <jan.kratochvil@redhat.com>
Disable epilogue unwinders on recent GCCs.
* amd64-tdep.c (amd64_in_function_epilogue_p): New variable symtab,
initialize it, return 0 on EPILOGUE_UNWIND_VALID.
* dwarf2read.c (process_full_comp_unit): Initialize
EPILOGUE_UNWIND_VALID.
* i386-tdep.c (i386_in_function_epilogue_p): New variable symtab,
initialize it, return 0 on EPILOGUE_UNWIND_VALID.
* symtab.h (struct symtab): New field epilogue_unwind_valid.
2011-06-29 Jan Kratochvil <jan.kratochvil@redhat.com>
Code cleanup - reformatting.

5
gdb/amd64-tdep.c
View file

@ -2219,6 +2219,11 @@ static int
amd64_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
gdb_byte insn;
struct symtab *symtab;
symtab = find_pc_symtab (pc);
if (symtab && symtab->epilogue_unwind_valid)
return 0;
if (target_read_memory (pc, &insn, 1))
return 0; /* Can't read memory at pc. */

3
gdb/dwarf2read.c
View file

@ -4751,6 +4751,9 @@ process_full_comp_unit (struct dwarf2_per_cu_data *per_cu)
*/
if (cu->has_loclist && gcc_4_minor >= 0)
symtab->locations_valid = 1;
if (gcc_4_minor >= 5)
symtab->epilogue_unwind_valid = 1;
}
if (dwarf2_per_objfile->using_index)

5
gdb/i386-tdep.c
View file

@ -1885,6 +1885,11 @@ static int
i386_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
gdb_byte insn;
struct symtab *symtab;
symtab = find_pc_symtab (pc);
if (symtab && symtab->epilogue_unwind_valid)
return 0;
if (target_read_memory (pc, &insn, 1))
return 0; /* Can't read memory at pc. */

5
gdb/symtab.h
View file

@ -779,6 +779,11 @@ struct symtab
unsigned int locations_valid : 1;
/* DWARF unwinder for this CU is valid even for epilogues (PC at the return
instruction). This is supported by GCC since 4.5.0. */
unsigned int epilogue_unwind_valid : 1;
/* The macro table for this symtab. Like the blockvector, this
may be shared between different symtabs --- and normally is for
all the symtabs in a given compilation unit. */