/* Frame unwinder for frames with DWARF Call Frame Information.
- Copyright (C) 2003-2017 Free Software Foundation, Inc.
+ Copyright (C) 2003-2019 Free Software Foundation, Inc.
Contributed by Mark Kettenis.
#include "complaints.h"
#include "dwarf2-frame.h"
+#include "dwarf2read.h"
#include "ax.h"
#include "dwarf2loc.h"
#include "dwarf2-frame-tailcall.h"
+#include "gdbsupport/gdb_binary_search.h"
#if GDB_SELF_TEST
-#include "selftest.h"
+#include "gdbsupport/selftest.h"
#include "selftest-arch.h"
#endif
+#include <unordered_map>
+
+#include <algorithm>
struct comp_unit;
unsigned char segment_size;
};
-struct dwarf2_cie_table
-{
- int num_entries;
- struct dwarf2_cie **entries;
-};
+/* The CIE table is used to find CIEs during parsing, but then
+ discarded. It maps from the CIE's offset to the CIE. */
+typedef std::unordered_map<ULONGEST, dwarf2_cie *> dwarf2_cie_table;
/* Frame Description Entry (FDE). */
CORE_ADDR func_base);
\f
+/* See dwarf2-frame.h. */
+bool dwarf2_frame_unwinders_enabled_p = true;
+
/* Store the length the expression for the CFA in the `cfa_reg' field,
which is unused in that case. */
#define cfa_exp_len cfa_reg
{
ULONGEST reg;
- gdb_assert (fs->initial.reg);
reg = dwarf2_frame_adjust_regnum (gdbarch, reg_num, eh_frame_p);
fs->regs.alloc_regs (reg + 1);
/* Check if this register was explicitly initialized in the
CIE initial instructions. If not, default the rule to
UNSPECIFIED. */
- if (reg < fs->initial.num_regs)
+ if (reg < fs->initial.reg.size ())
fs->regs.reg[reg] = fs->initial.reg[reg];
else
fs->regs.reg[reg].how = DWARF2_FRAME_REG_UNSPECIFIED;
{
int regnum = dwarf_reg_to_regnum (gdbarch, reg);
- complaint (&symfile_complaints, _("\
+ complaint (_("\
incomplete CFI data; DW_CFA_restore unspecified\n\
register %s (#%d) at %s"),
gdbarch_register_name (gdbarch, regnum), regnum,
struct frame_info *this_frame;
- CORE_ADDR read_addr_from_reg (int reg) OVERRIDE
+ CORE_ADDR read_addr_from_reg (int reg) override
{
return ::read_addr_from_reg (this_frame, reg);
}
- struct value *get_reg_value (struct type *type, int reg) OVERRIDE
+ struct value *get_reg_value (struct type *type, int reg) override
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
int regnum = dwarf_reg_to_regnum_or_error (gdbarch, reg);
return value_from_register (type, regnum, this_frame);
}
- void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) OVERRIDE
+ void read_mem (gdb_byte *buf, CORE_ADDR addr, size_t len) override
{
read_memory (addr, buf, len);
}
- void get_frame_base (const gdb_byte **start, size_t *length) OVERRIDE
+ void get_frame_base (const gdb_byte **start, size_t *length) override
{
invalid ("DW_OP_fbreg");
}
void push_dwarf_reg_entry_value (enum call_site_parameter_kind kind,
union call_site_parameter_u kind_u,
- int deref_size) OVERRIDE
+ int deref_size) override
{
invalid ("DW_OP_entry_value");
}
- CORE_ADDR get_object_address () OVERRIDE
+ CORE_ADDR get_object_address () override
{
invalid ("DW_OP_push_object_address");
}
- CORE_ADDR get_frame_cfa () OVERRIDE
+ CORE_ADDR get_frame_cfa () override
{
invalid ("DW_OP_call_frame_cfa");
}
- CORE_ADDR get_tls_address (CORE_ADDR offset) OVERRIDE
+ CORE_ADDR get_tls_address (CORE_ADDR offset) override
{
invalid ("DW_OP_form_tls_address");
}
- void dwarf_call (cu_offset die_offset) OVERRIDE
+ void dwarf_call (cu_offset die_offset) override
{
invalid ("DW_OP_call*");
}
- CORE_ADDR get_addr_index (unsigned int index)
+ struct value *dwarf_variable_value (sect_offset sect_off) override
{
- invalid ("DW_OP_GNU_addr_index");
+ invalid ("DW_OP_GNU_variable_value");
+ }
+
+ CORE_ADDR get_addr_index (unsigned int index) override
+ {
+ invalid ("DW_OP_addrx or DW_OP_GNU_addr_index");
}
private:
if (old_rs == NULL)
{
- complaint (&symfile_complaints, _("\
+ complaint (_("\
bad CFI data; mismatched DW_CFA_restore_state at %s"),
paddress (gdbarch, fs->pc));
}
}
}
- if (fs->initial.reg == NULL)
+ if (fs->initial.reg.empty ())
{
/* Don't allow remember/restore between CIE and FDE programs. */
delete fs->regs.prev;
auto r1 = dwarf2_frame_adjust_regnum (gdbarch, 1, fde.eh_frame_p);
auto r2 = dwarf2_frame_adjust_regnum (gdbarch, 2, fde.eh_frame_p);
- SELF_CHECK (fs.regs.num_regs == (std::max (r1, r2) + 1));
+ SELF_CHECK (fs.regs.reg.size () == (std::max (r1, r2) + 1));
SELF_CHECK (fs.regs.reg[r2].how == DWARF2_FRAME_REG_SAVED_OFFSET);
SELF_CHECK (fs.regs.reg[r2].loc.offset == -4);
- for (auto i = 0; i < fs.regs.num_regs; i++)
+ for (auto i = 0; i < fs.regs.reg.size (); i++)
if (i != r2)
SELF_CHECK (fs.regs.reg[i].how == DWARF2_FRAME_REG_UNSPECIFIED);
dwarf2_frame_cache (struct frame_info *this_frame, void **this_cache)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
- const int num_regs = gdbarch_num_regs (gdbarch)
- + gdbarch_num_pseudo_regs (gdbarch);
+ const int num_regs = gdbarch_num_cooked_regs (gdbarch);
struct dwarf2_frame_cache *cache;
struct dwarf2_fde *fde;
CORE_ADDR entry_pc;
/* Save the initialized register set. */
fs.initial = fs.regs;
- if (get_frame_func_if_available (this_frame, &entry_pc))
+ /* Fetching the entry pc for THIS_FRAME won't necessarily result
+ in an address that's within the range of FDE locations. This
+ is due to the possibility of the function occupying non-contiguous
+ ranges. */
+ if (get_frame_func_if_available (this_frame, &entry_pc)
+ && fde->initial_location <= entry_pc
+ && entry_pc < fde->initial_location + fde->address_range)
{
/* Decode the insns in the FDE up to the entry PC. */
instr = execute_cfa_program (fde, fde->instructions, fde->end, gdbarch,
execute_cfa_program (fde, instr, fde->end, gdbarch,
get_frame_address_in_block (this_frame), &fs);
- TRY
+ try
{
/* Calculate the CFA. */
switch (fs.regs.cfa_how)
internal_error (__FILE__, __LINE__, _("Unknown CFA rule."));
}
}
- CATCH (ex, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &ex)
{
if (ex.error == NOT_AVAILABLE_ERROR)
{
return cache;
}
- throw_exception (ex);
+ throw;
}
- END_CATCH
/* Initialize the register state. */
{
{
int column; /* CFI speak for "register number". */
- for (column = 0; column < fs.regs.num_regs; column++)
+ for (column = 0; column < fs.regs.reg.size (); column++)
{
/* Use the GDB register number as the destination index. */
int regnum = dwarf_reg_to_regnum (gdbarch, column);
if (fs.regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED)
{
if (cache->reg[regnum].how == DWARF2_FRAME_REG_UNSPECIFIED)
- complaint (&symfile_complaints, _("\
+ complaint (_("\
incomplete CFI data; unspecified registers (e.g., %s) at %s"),
gdbarch_register_name (gdbarch, regnum),
paddress (gdbarch, fs.pc));
if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA
|| cache->reg[regnum].how == DWARF2_FRAME_REG_RA_OFFSET)
{
- struct dwarf2_frame_state_reg *retaddr_reg =
- &fs.regs.reg[fs.retaddr_column];
+ const std::vector<struct dwarf2_frame_state_reg> ®s
+ = fs.regs.reg;
+ ULONGEST retaddr_column = fs.retaddr_column;
/* It seems rather bizarre to specify an "empty" column as
the return adress column. However, this is exactly
register corresponding to the return address column.
Incidentally, that's how we should treat a return
address column specifying "same value" too. */
- if (fs.retaddr_column < fs.regs.num_regs
- && retaddr_reg->how != DWARF2_FRAME_REG_UNSPECIFIED
- && retaddr_reg->how != DWARF2_FRAME_REG_SAME_VALUE)
+ if (fs.retaddr_column < fs.regs.reg.size ()
+ && regs[retaddr_column].how != DWARF2_FRAME_REG_UNSPECIFIED
+ && regs[retaddr_column].how != DWARF2_FRAME_REG_SAME_VALUE)
{
if (cache->reg[regnum].how == DWARF2_FRAME_REG_RA)
- cache->reg[regnum] = *retaddr_reg;
+ cache->reg[regnum] = regs[retaddr_column];
else
- cache->retaddr_reg = *retaddr_reg;
+ cache->retaddr_reg = regs[retaddr_column];
}
else
{
}
}
- if (fs.retaddr_column < fs.regs.num_regs
+ if (fs.retaddr_column < fs.regs.reg.size ()
&& fs.regs.reg[fs.retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED)
cache->undefined_retaddr = 1;
dwarf2_frame_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame, void **this_cache)
{
- /* Grab an address that is guarenteed to reside somewhere within the
+ if (!dwarf2_frame_unwinders_enabled_p)
+ return 0;
+
+ /* Grab an address that is guaranteed to reside somewhere within the
function. get_frame_pc(), with a no-return next function, can
end up returning something past the end of this function's body.
If the frame we're sniffing for is a signal frame whose start
return get_frame_base (this_frame);
}
\f
-const struct objfile_data *dwarf2_frame_objfile_data;
+const struct objfile_key<dwarf2_fde_table,
+ gdb::noop_deleter<dwarf2_fde_table>>
+ dwarf2_frame_objfile_data;
static unsigned int
read_1_byte (bfd *abfd, const gdb_byte *buf)
read_initial_length (bfd *abfd, const gdb_byte *buf,
unsigned int *bytes_read_ptr)
{
- LONGEST result;
+ ULONGEST result;
result = bfd_get_32 (abfd, buf);
if (result == 0xffffffff)
base = 0;
break;
case DW_EH_PE_pcrel:
- base = bfd_get_section_vma (unit->abfd, unit->dwarf_frame_section);
+ base = bfd_section_vma (unit->dwarf_frame_section);
base += (buf - unit->dwarf_frame_buffer);
break;
case DW_EH_PE_datarel:
}
\f
-static int
-bsearch_cie_cmp (const void *key, const void *element)
-{
- ULONGEST cie_pointer = *(ULONGEST *) key;
- struct dwarf2_cie *cie = *(struct dwarf2_cie **) element;
-
- if (cie_pointer == cie->cie_pointer)
- return 0;
-
- return (cie_pointer < cie->cie_pointer) ? -1 : 1;
-}
-
/* Find CIE with the given CIE_POINTER in CIE_TABLE. */
static struct dwarf2_cie *
-find_cie (struct dwarf2_cie_table *cie_table, ULONGEST cie_pointer)
+find_cie (const dwarf2_cie_table &cie_table, ULONGEST cie_pointer)
{
- struct dwarf2_cie **p_cie;
-
- /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
- bsearch be non-NULL. */
- if (cie_table->entries == NULL)
- {
- gdb_assert (cie_table->num_entries == 0);
- return NULL;
- }
-
- p_cie = ((struct dwarf2_cie **)
- bsearch (&cie_pointer, cie_table->entries, cie_table->num_entries,
- sizeof (cie_table->entries[0]), bsearch_cie_cmp));
- if (p_cie != NULL)
- return *p_cie;
+ auto iter = cie_table.find (cie_pointer);
+ if (iter != cie_table.end ())
+ return iter->second;
return NULL;
}
-/* Add a pointer to new CIE to the CIE_TABLE, allocating space for it. */
-static void
-add_cie (struct dwarf2_cie_table *cie_table, struct dwarf2_cie *cie)
+static inline int
+bsearch_fde_cmp (const dwarf2_fde *fde, CORE_ADDR seek_pc)
{
- const int n = cie_table->num_entries;
-
- gdb_assert (n < 1
- || cie_table->entries[n - 1]->cie_pointer < cie->cie_pointer);
-
- cie_table->entries
- = XRESIZEVEC (struct dwarf2_cie *, cie_table->entries, n + 1);
- cie_table->entries[n] = cie;
- cie_table->num_entries = n + 1;
-}
-
-static int
-bsearch_fde_cmp (const void *key, const void *element)
-{
- CORE_ADDR seek_pc = *(CORE_ADDR *) key;
- struct dwarf2_fde *fde = *(struct dwarf2_fde **) element;
-
- if (seek_pc < fde->initial_location)
+ if (fde->initial_location + fde->address_range <= seek_pc)
return -1;
- if (seek_pc < fde->initial_location + fde->address_range)
+ if (fde->initial_location <= seek_pc)
return 0;
return 1;
}
/* Find the FDE for *PC. Return a pointer to the FDE, and store the
- inital location associated with it into *PC. */
+ initial location associated with it into *PC. */
static struct dwarf2_fde *
dwarf2_frame_find_fde (CORE_ADDR *pc, CORE_ADDR *out_offset)
{
- struct objfile *objfile;
-
- ALL_OBJFILES (objfile)
+ for (objfile *objfile : current_program_space->objfiles ())
{
struct dwarf2_fde_table *fde_table;
- struct dwarf2_fde **p_fde;
CORE_ADDR offset;
CORE_ADDR seek_pc;
- fde_table = ((struct dwarf2_fde_table *)
- objfile_data (objfile, dwarf2_frame_objfile_data));
+ fde_table = dwarf2_frame_objfile_data.get (objfile);
if (fde_table == NULL)
{
dwarf2_build_frame_info (objfile);
- fde_table = ((struct dwarf2_fde_table *)
- objfile_data (objfile, dwarf2_frame_objfile_data));
+ fde_table = dwarf2_frame_objfile_data.get (objfile);
}
gdb_assert (fde_table != NULL);
continue;
seek_pc = *pc - offset;
- p_fde = ((struct dwarf2_fde **)
- bsearch (&seek_pc, fde_table->entries, fde_table->num_entries,
- sizeof (fde_table->entries[0]), bsearch_fde_cmp));
- if (p_fde != NULL)
+ auto end = fde_table->entries + fde_table->num_entries;
+ auto it = gdb::binary_search (fde_table->entries, end, seek_pc, bsearch_fde_cmp);
+ if (it != end)
{
- *pc = (*p_fde)->initial_location + offset;
+ *pc = (*it)->initial_location + offset;
if (out_offset)
*out_offset = offset;
- return *p_fde;
+ return *it;
}
}
return NULL;
static const gdb_byte *decode_frame_entry (struct comp_unit *unit,
const gdb_byte *start,
int eh_frame_p,
- struct dwarf2_cie_table *cie_table,
+ dwarf2_cie_table &cie_table,
struct dwarf2_fde_table *fde_table,
enum eh_frame_type entry_type);
static const gdb_byte *
decode_frame_entry_1 (struct comp_unit *unit, const gdb_byte *start,
int eh_frame_p,
- struct dwarf2_cie_table *cie_table,
+ dwarf2_cie_table &cie_table,
struct dwarf2_fde_table *fde_table,
enum eh_frame_type entry_type)
{
struct gdbarch *gdbarch = get_objfile_arch (unit->objfile);
const gdb_byte *buf, *end;
- LONGEST length;
+ ULONGEST length;
unsigned int bytes_read;
int dwarf64_p;
ULONGEST cie_id;
buf = start;
length = read_initial_length (unit->abfd, buf, &bytes_read);
buf += bytes_read;
- end = buf + length;
-
- /* Are we still within the section? */
- if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size)
- return NULL;
+ end = buf + (size_t) length;
if (length == 0)
return end;
+ /* Are we still within the section? */
+ if (end <= buf || end > unit->dwarf_frame_buffer + unit->dwarf_frame_size)
+ return NULL;
+
/* Distinguish between 32 and 64-bit encoded frame info. */
dwarf64_p = (bytes_read == 12);
cie->saw_z_augmentation = (*augmentation == 'z');
if (cie->saw_z_augmentation)
{
- uint64_t length;
+ uint64_t uleb_length;
- buf = gdb_read_uleb128 (buf, end, &length);
+ buf = gdb_read_uleb128 (buf, end, &uleb_length);
if (buf == NULL)
return NULL;
- cie->initial_instructions = buf + length;
+ cie->initial_instructions = buf + uleb_length;
augmentation++;
}
cie->end = end;
cie->unit = unit;
- add_cie (cie_table, cie);
+ cie_table[cie->cie_pointer] = cie;
}
else
{
can skip the whole thing. */
if (fde->cie->saw_z_augmentation)
{
- uint64_t length;
+ uint64_t uleb_length;
- buf = gdb_read_uleb128 (buf, end, &length);
+ buf = gdb_read_uleb128 (buf, end, &uleb_length);
if (buf == NULL)
return NULL;
- buf += length;
+ buf += uleb_length;
if (buf > end)
return NULL;
}
static const gdb_byte *
decode_frame_entry (struct comp_unit *unit, const gdb_byte *start,
int eh_frame_p,
- struct dwarf2_cie_table *cie_table,
+ dwarf2_cie_table &cie_table,
struct dwarf2_fde_table *fde_table,
enum eh_frame_type entry_type)
{
break;
case ALIGN4:
- complaint (&symfile_complaints, _("\
+ complaint (_("\
Corrupt data in %s:%s; align 4 workaround apparently succeeded"),
unit->dwarf_frame_section->owner->filename,
unit->dwarf_frame_section->name);
break;
case ALIGN8:
- complaint (&symfile_complaints, _("\
+ complaint (_("\
Corrupt data in %s:%s; align 8 workaround apparently succeeded"),
unit->dwarf_frame_section->owner->filename,
unit->dwarf_frame_section->name);
break;
default:
- complaint (&symfile_complaints,
- _("Corrupt data in %s:%s"),
+ complaint (_("Corrupt data in %s:%s"),
unit->dwarf_frame_section->owner->filename,
unit->dwarf_frame_section->name);
break;
return ret;
}
\f
-static int
-qsort_fde_cmp (const void *a, const void *b)
+static bool
+fde_is_less_than (const dwarf2_fde *aa, const dwarf2_fde *bb)
{
- struct dwarf2_fde *aa = *(struct dwarf2_fde **)a;
- struct dwarf2_fde *bb = *(struct dwarf2_fde **)b;
-
if (aa->initial_location == bb->initial_location)
{
if (aa->address_range != bb->address_range
&& aa->eh_frame_p == 0 && bb->eh_frame_p == 0)
/* Linker bug, e.g. gold/10400.
Work around it by keeping stable sort order. */
- return (a < b) ? -1 : 1;
+ return aa < bb;
else
/* Put eh_frame entries after debug_frame ones. */
- return aa->eh_frame_p - bb->eh_frame_p;
+ return aa->eh_frame_p < bb->eh_frame_p;
}
- return (aa->initial_location < bb->initial_location) ? -1 : 1;
+ return aa->initial_location < bb->initial_location;
}
void
{
struct comp_unit *unit;
const gdb_byte *frame_ptr;
- struct dwarf2_cie_table cie_table;
+ dwarf2_cie_table cie_table;
struct dwarf2_fde_table fde_table;
struct dwarf2_fde_table *fde_table2;
- cie_table.num_entries = 0;
- cie_table.entries = NULL;
-
fde_table.num_entries = 0;
fde_table.entries = NULL;
/* Build a minimal decoding of the DWARF2 compilation unit. */
- unit = (struct comp_unit *) obstack_alloc (&objfile->objfile_obstack,
- sizeof (struct comp_unit));
+ unit = XOBNEW (&objfile->objfile_obstack, comp_unit);
unit->abfd = objfile->obfd;
unit->objfile = objfile;
unit->dbase = 0;
if (txt)
unit->tbase = txt->vma;
- TRY
+ try
{
frame_ptr = unit->dwarf_frame_buffer;
while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size)
frame_ptr = decode_frame_entry (unit, frame_ptr, 1,
- &cie_table, &fde_table,
+ cie_table, &fde_table,
EH_CIE_OR_FDE_TYPE_ID);
}
- CATCH (e, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &e)
{
warning (_("skipping .eh_frame info of %s: %s"),
- objfile_name (objfile), e.message);
+ objfile_name (objfile), e.what ());
if (fde_table.num_entries != 0)
{
fde_table.entries = NULL;
fde_table.num_entries = 0;
}
- /* The cie_table is discarded by the next if. */
+ /* The cie_table is discarded below. */
}
- END_CATCH
-
- if (cie_table.num_entries != 0)
- {
- /* Reinit cie_table: debug_frame has different CIEs. */
- xfree (cie_table.entries);
- cie_table.num_entries = 0;
- cie_table.entries = NULL;
- }
+
+ cie_table.clear ();
}
}
{
int num_old_fde_entries = fde_table.num_entries;
- TRY
+ try
{
frame_ptr = unit->dwarf_frame_buffer;
while (frame_ptr < unit->dwarf_frame_buffer + unit->dwarf_frame_size)
frame_ptr = decode_frame_entry (unit, frame_ptr, 0,
- &cie_table, &fde_table,
+ cie_table, &fde_table,
EH_CIE_OR_FDE_TYPE_ID);
}
- CATCH (e, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &e)
{
warning (_("skipping .debug_frame info of %s: %s"),
- objfile_name (objfile), e.message);
+ objfile_name (objfile), e.what ());
if (fde_table.num_entries != 0)
{
}
}
fde_table.num_entries = num_old_fde_entries;
- /* The cie_table is discarded by the next if. */
}
- END_CATCH
- }
-
- /* Discard the cie_table, it is no longer needed. */
- if (cie_table.num_entries != 0)
- {
- xfree (cie_table.entries);
- cie_table.entries = NULL; /* Paranoia. */
- cie_table.num_entries = 0; /* Paranoia. */
}
/* Copy fde_table to obstack: it is needed at runtime. */
int i;
/* Prepare FDE table for lookups. */
- qsort (fde_table.entries, fde_table.num_entries,
- sizeof (fde_table.entries[0]), qsort_fde_cmp);
+ std::sort (fde_table.entries, fde_table.entries + fde_table.num_entries,
+ fde_is_less_than);
/* Check for leftovers from --gc-sections. The GNU linker sets
the relevant symbols to zero, but doesn't zero the FDE *end*
xfree (fde_table.entries);
}
- set_objfile_data (objfile, dwarf2_frame_objfile_data, fde_table2);
+ dwarf2_frame_objfile_data.set (objfile, fde_table2);
+}
+
+/* Handle 'maintenance show dwarf unwinders'. */
+
+static void
+show_dwarf_unwinders_enabled_p (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c,
+ const char *value)
+{
+ fprintf_filtered (file,
+ _("The DWARF stack unwinders are currently %s.\n"),
+ value);
}
void
_initialize_dwarf2_frame (void)
{
dwarf2_frame_data = gdbarch_data_register_pre_init (dwarf2_frame_init);
- dwarf2_frame_objfile_data = register_objfile_data ();
+
+ add_setshow_boolean_cmd ("unwinders", class_obscure,
+ &dwarf2_frame_unwinders_enabled_p , _("\
+Set whether the DWARF stack frame unwinders are used."), _("\
+Show whether the DWARF stack frame unwinders are used."), _("\
+When enabled the DWARF stack frame unwinders can be used for architectures\n\
+that support the DWARF unwinders. Enabling the DWARF unwinders for an\n\
+architecture that doesn't support them will have no effect."),
+ NULL,
+ show_dwarf_unwinders_enabled_p,
+ &set_dwarf_cmdlist,
+ &show_dwarf_cmdlist);
#if GDB_SELF_TEST
selftests::register_test_foreach_arch ("execute_cfa_program",
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