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re PR debug/77589 (fortran: Missing DW_AT_byte_stride for an array record field selection)

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PR debug/77589
include/
	* dwarf2.def (DW_OP_GNU_variable_value): New opcode.
gcc/
	* dwarf2out.c (struct dw_loc_list_struct): Add noted_variable_value
	bitfield.
	(size_of_loc_descr): Handle DW_OP_GNU_variable_value.
	(output_loc_operands): Handle DW_OP_call_ref and
	DW_OP_GNU_variable_value.
	(struct variable_value_struct): New type.
	(struct variable_value_hasher): Likewise.
	(variable_value_hash): New variable.
	(string_types): Remove.
	(copy_loc_descr): New function.
	(add_loc_descr_to_each): Clarify comment.  Use copy_loc_descr.
	(prepend_loc_descr_to_each): New function.
	(add_loc_list): Fix comment typo.  Use prepend_loc_descr_to_each
	instead of add_loc_descr_to_each if the first argument is single
	location list and the second has multiple.
	(resolve_args_picking_1): Handle DW_OP_GNU_variable_value.
	(loc_list_from_tree_1): For early_dwarf, emit DW_OP_GNU_variable_value
	when looking for variable value which doesn't have other location info.
	(loc_list_from_tree): Formatting fix.
	(gen_array_type_die): Simplify DW_AT_string_length handling.
	(adjust_string_types): Remove.
	(gen_subprogram_die): Don't call adjust_string_types nor test/set
	string_types.  Call resolve_variable_values.
	(prune_unused_types_walk_loc_descr): Handle DW_OP_GNU_variable_value.
	(resolve_addr_in_expr): Likewise.  Add A argument.
	(copy_deref_exprloc): Remove deref argument.  Adjust for the
	original expression being DW_OP_GNU_variable_value with optionally
	DW_OP_stack_value after it instead of DW_OP_call4 with DW_OP_deref
	optionally after it.
	(optimize_string_length): Rework for DW_OP_GNU_variable_value.
	(resolve_addr): Adjust optimize_string_length and resolve_addr_in_expr
	callers.  Set remove_AT_byte_size if removing DW_AT_string_length.
	(variable_value_hasher::hash, variable_value_hasher::equal): New
	methods.
	(resolve_variable_value_in_expr, resolve_variable_value,
	resolve_variable_values, note_variable_value_in_expr,
	note_variable_value): New functions.
	(dwarf2out_early_finish): Call note_variable_value on all toplevel
	DIEs.

From-SVN: r245733
This commit is contained in:
Jakub Jelinek 2017-02-25 09:18:24 +01:00 committed by Jakub Jelinek
parent a920ed32a7
commit 680c60feb4
4 changed files with 546 additions and 142 deletions
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43
gcc/ChangeLog
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@ -1,3 +1,46 @@
2017-02-25 Jakub Jelinek <jakub@redhat.com>
PR debug/77589
* dwarf2out.c (struct dw_loc_list_struct): Add noted_variable_value
bitfield.
(size_of_loc_descr): Handle DW_OP_GNU_variable_value.
(output_loc_operands): Handle DW_OP_call_ref and
DW_OP_GNU_variable_value.
(struct variable_value_struct): New type.
(struct variable_value_hasher): Likewise.
(variable_value_hash): New variable.
(string_types): Remove.
(copy_loc_descr): New function.
(add_loc_descr_to_each): Clarify comment. Use copy_loc_descr.
(prepend_loc_descr_to_each): New function.
(add_loc_list): Fix comment typo. Use prepend_loc_descr_to_each
instead of add_loc_descr_to_each if the first argument is single
location list and the second has multiple.
(resolve_args_picking_1): Handle DW_OP_GNU_variable_value.
(loc_list_from_tree_1): For early_dwarf, emit DW_OP_GNU_variable_value
when looking for variable value which doesn't have other location info.
(loc_list_from_tree): Formatting fix.
(gen_array_type_die): Simplify DW_AT_string_length handling.
(adjust_string_types): Remove.
(gen_subprogram_die): Don't call adjust_string_types nor test/set
string_types. Call resolve_variable_values.
(prune_unused_types_walk_loc_descr): Handle DW_OP_GNU_variable_value.
(resolve_addr_in_expr): Likewise. Add A argument.
(copy_deref_exprloc): Remove deref argument. Adjust for the
original expression being DW_OP_GNU_variable_value with optionally
DW_OP_stack_value after it instead of DW_OP_call4 with DW_OP_deref
optionally after it.
(optimize_string_length): Rework for DW_OP_GNU_variable_value.
(resolve_addr): Adjust optimize_string_length and resolve_addr_in_expr
callers. Set remove_AT_byte_size if removing DW_AT_string_length.
(variable_value_hasher::hash, variable_value_hasher::equal): New
methods.
(resolve_variable_value_in_expr, resolve_variable_value,
resolve_variable_values, note_variable_value_in_expr,
note_variable_value): New functions.
(dwarf2out_early_finish): Call note_variable_value on all toplevel
DIEs.
2017-02-24 Jakub Jelinek <jakub@redhat.com>
PR c/79677

637
gcc/dwarf2out.c
View File

@ -1293,6 +1293,8 @@ typedef struct GTY(()) dw_loc_list_struct {
unsigned char num_assigned : 1;
/* True if .debug_loclists.dwo offset has been emitted for it already. */
unsigned char offset_emitted : 1;
/* True if note_variable_value_in_expr has been called on it. */
unsigned char noted_variable_value : 1;
/* True if the range should be emitted even if begin and end
are the same. */
bool force;
@ -1791,6 +1793,7 @@ size_of_loc_descr (dw_loc_descr_ref loc)
size += 4;
break;
case DW_OP_call_ref:
case DW_OP_GNU_variable_value:
size += DWARF_REF_SIZE;
break;
case DW_OP_implicit_value:
@ -2214,6 +2217,17 @@ output_loc_operands (dw_loc_descr_ref loc, int for_eh_or_skip)
}
break;
case DW_OP_call_ref:
case DW_OP_GNU_variable_value:
{
char label[MAX_ARTIFICIAL_LABEL_BYTES
+ HOST_BITS_PER_WIDE_INT / 2 + 2];
gcc_assert (val1->val_class == dw_val_class_die_ref);
get_ref_die_offset_label (label, val1->v.val_die_ref.die);
dw2_asm_output_offset (DWARF_REF_SIZE, label, debug_info_section, NULL);
}
break;
case DW_OP_implicit_pointer:
case DW_OP_GNU_implicit_pointer:
{
@ -3097,6 +3111,23 @@ struct decl_die_hasher : ggc_ptr_hash<die_node>
The key is a DECL_UID() which is a unique number identifying each decl. */
static GTY (()) hash_table<decl_die_hasher> *decl_die_table;
struct GTY ((for_user)) variable_value_struct {
unsigned int decl_id;
vec<dw_die_ref, va_gc> *dies;
};
struct variable_value_hasher : ggc_ptr_hash<variable_value_struct>
{
typedef tree compare_type;
static hashval_t hash (variable_value_struct *);
static bool equal (variable_value_struct *, tree);
};
/* A hash table of DIEs that contain DW_OP_GNU_variable_value with
dw_val_class_decl_ref class, indexed by FUNCTION_DECLs which is
DECL_CONTEXT of the referenced VAR_DECLs. */
static GTY (()) hash_table<variable_value_hasher> *variable_value_hash;
struct block_die_hasher : ggc_ptr_hash<die_struct>
{
static hashval_t hash (die_struct *);
@ -3287,10 +3318,6 @@ static bool frame_pointer_fb_offset_valid;
static vec<dw_die_ref> base_types;
/* Pointer to vector of DW_TAG_string_type DIEs that need finalization
once all arguments are parsed. */
static vec<dw_die_ref> *string_types;
/* Flags to represent a set of attribute classes for attributes that represent
a scalar value (bounds, pointers, ...). */
enum dw_scalar_form
@ -3605,6 +3632,7 @@ static void gen_remaining_tmpl_value_param_die_attribute (void);
static bool generic_type_p (tree);
static void schedule_generic_params_dies_gen (tree t);
static void gen_scheduled_generic_parms_dies (void);
static void resolve_variable_values (void);
static const char *comp_dir_string (void);
@ -16292,7 +16320,17 @@ single_element_loc_list_p (dw_loc_list_ref list)
return !list->ll_symbol;
}
/* To each location in list LIST add loc descr REF. */
/* Duplicate a single element of location list. */
static inline dw_loc_descr_ref
copy_loc_descr (dw_loc_descr_ref ref)
{
dw_loc_descr_ref copy = ggc_alloc<dw_loc_descr_node> ();
memcpy (copy, ref, sizeof (dw_loc_descr_node));
return copy;
}
/* To each location in list LIST append loc descr REF. */
static void
add_loc_descr_to_each (dw_loc_list_ref list, dw_loc_descr_ref ref)
@ -16302,16 +16340,31 @@ add_loc_descr_to_each (dw_loc_list_ref list, dw_loc_descr_ref ref)
list = list->dw_loc_next;
while (list)
{
copy = ggc_alloc<dw_loc_descr_node> ();
memcpy (copy, ref, sizeof (dw_loc_descr_node));
copy = copy_loc_descr (ref);
add_loc_descr (&list->expr, copy);
while (copy->dw_loc_next)
{
dw_loc_descr_ref new_copy = ggc_alloc<dw_loc_descr_node> ();
memcpy (new_copy, copy->dw_loc_next, sizeof (dw_loc_descr_node));
copy->dw_loc_next = new_copy;
copy = new_copy;
}
copy = copy->dw_loc_next = copy_loc_descr (copy->dw_loc_next);
list = list->dw_loc_next;
}
}
/* To each location in list LIST prepend loc descr REF. */
static void
prepend_loc_descr_to_each (dw_loc_list_ref list, dw_loc_descr_ref ref)
{
dw_loc_descr_ref copy;
dw_loc_descr_ref ref_end = list->expr;
add_loc_descr (&ref, list->expr);
list->expr = ref;
list = list->dw_loc_next;
while (list)
{
dw_loc_descr_ref end = list->expr;
list->expr = copy = copy_loc_descr (ref);
while (copy->dw_loc_next != ref_end)
copy = copy->dw_loc_next = copy_loc_descr (copy->dw_loc_next);
copy->dw_loc_next = end;
list = list->dw_loc_next;
}
}
@ -16322,7 +16375,7 @@ add_loc_descr_to_each (dw_loc_list_ref list, dw_loc_descr_ref ref)
Might be destructive on both RET and LIST.
TODO: We handle only simple cases of RET or LIST having at most one
element. General case would inolve sorting the lists in program order
element. General case would involve sorting the lists in program order
and merging them that will need some additional work.
Adding that will improve quality of debug info especially for SRA-ed
structures. */
@ -16344,7 +16397,7 @@ add_loc_list (dw_loc_list_ref *ret, dw_loc_list_ref list)
}
if (!(*ret)->dw_loc_next)
{
add_loc_descr_to_each (list, (*ret)->expr);
prepend_loc_descr_to_each (list, (*ret)->expr);
*ret = list;
return;
}
@ -16824,6 +16877,7 @@ resolve_args_picking_1 (dw_loc_descr_ref loc, unsigned initial_frame_offset,
case DW_OP_fbreg:
case DW_OP_push_object_address:
case DW_OP_call_frame_cfa:
case DW_OP_GNU_variable_value:
++frame_offset_;
break;
@ -17299,6 +17353,31 @@ loc_list_from_tree_1 (tree loc, int want_address,
rtl = rtl_for_decl_location (loc);
if (rtl == NULL_RTX)
{
if (TREE_CODE (loc) != FUNCTION_DECL
&& early_dwarf
&& current_function_decl
&& want_address != 1
&& (INTEGRAL_TYPE_P (TREE_TYPE (loc))
|| POINTER_TYPE_P (TREE_TYPE (loc)))
&& DECL_CONTEXT (loc) == current_function_decl
&& (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (loc)))
<= DWARF2_ADDR_SIZE))
{
dw_die_ref ref = lookup_decl_die (loc);
ret = new_loc_descr (DW_OP_GNU_variable_value, 0, 0);
if (ref)
{
ret->dw_loc_oprnd1.val_class = dw_val_class_die_ref;
ret->dw_loc_oprnd1.v.val_die_ref.die = ref;
ret->dw_loc_oprnd1.v.val_die_ref.external = 0;
}
else
{
ret->dw_loc_oprnd1.val_class = dw_val_class_decl_ref;
ret->dw_loc_oprnd1.v.val_decl_ref = loc;
}
break;
}
expansion_failed (loc, NULL_RTX, "DECL has no RTL");
return 0;
}
@ -17873,8 +17952,7 @@ loc_list_from_tree (tree loc, int want_address,
dw_loc_list_ref result = loc_list_from_tree_1 (loc, want_address, context);
for (dw_loc_list_ref loc_cur = result;
loc_cur != NULL; loc_cur =
loc_cur->dw_loc_next)
loc_cur != NULL; loc_cur = loc_cur->dw_loc_next)
loc_descr_without_nops (loc_cur->expr);
return result;
}
@ -20685,7 +20763,6 @@ gen_array_type_die (tree type, dw_die_ref context_die)
{
tree szdecl = TYPE_MAX_VALUE (TYPE_DOMAIN (type));
tree rszdecl = szdecl;
HOST_WIDE_INT rsize = 0;
size = int_size_in_bytes (TREE_TYPE (szdecl));
if (!DECL_P (szdecl))
@ -20694,8 +20771,8 @@ gen_array_type_die (tree type, dw_die_ref context_die)
&& DECL_P (TREE_OPERAND (szdecl, 0)))
{
rszdecl = TREE_OPERAND (szdecl, 0);
rsize = int_size_in_bytes (TREE_TYPE (rszdecl));
if (rsize <= 0)
if (int_size_in_bytes (TREE_TYPE (rszdecl))
!= DWARF2_ADDR_SIZE)
size = 0;
}
else
@ -20703,41 +20780,9 @@ gen_array_type_die (tree type, dw_die_ref context_die)
}
if (size > 0)
{
dw_loc_list_ref loc = loc_list_from_tree (szdecl, 2, NULL);
if (loc == NULL
&& early_dwarf
&& current_function_decl
&& DECL_CONTEXT (rszdecl) == current_function_decl)
{
dw_die_ref ref = lookup_decl_die (rszdecl);
dw_loc_descr_ref l = NULL;
if (ref)
{
l = new_loc_descr (DW_OP_call4, 0, 0);
l->dw_loc_oprnd1.val_class = dw_val_class_die_ref;
l->dw_loc_oprnd1.v.val_die_ref.die = ref;
l->dw_loc_oprnd1.v.val_die_ref.external = 0;
}
else if (TREE_CODE (rszdecl) == PARM_DECL
&& string_types)
{
l = new_loc_descr (DW_OP_call4, 0, 0);
l->dw_loc_oprnd1.val_class = dw_val_class_decl_ref;
l->dw_loc_oprnd1.v.val_decl_ref = rszdecl;
string_types->safe_push (array_die);
}
if (l && rszdecl != szdecl)
{
if (rsize == DWARF2_ADDR_SIZE)
add_loc_descr (&l, new_loc_descr (DW_OP_deref,
0, 0));
else
add_loc_descr (&l, new_loc_descr (DW_OP_deref_size,
rsize, 0));
}
if (l)
loc = new_loc_list (l, NULL, NULL, NULL);
}
dw_loc_list_ref loc
= loc_list_from_tree (rszdecl, szdecl == rszdecl ? 2 : 0,
NULL);
if (loc)
{
add_AT_location_description (array_die, DW_AT_string_length,
@ -20814,39 +20859,6 @@ gen_array_type_die (tree type, dw_die_ref context_die)
add_alignment_attribute (array_die, type);
}
/* After all arguments are created, adjust any DW_TAG_string_type
DIEs DW_AT_string_length attributes. */
static void
adjust_string_types (void)
{
dw_die_ref array_die;
unsigned int i;
FOR_EACH_VEC_ELT (*string_types, i, array_die)
{
dw_attr_node *a = get_AT (array_die, DW_AT_string_length);
if (a == NULL)
continue;
dw_loc_descr_ref loc = AT_loc (a);
gcc_assert (loc->dw_loc_opc == DW_OP_call4
&& loc->dw_loc_oprnd1.val_class == dw_val_class_decl_ref);
dw_die_ref ref = lookup_decl_die (loc->dw_loc_oprnd1.v.val_decl_ref);
if (ref)
{
loc->dw_loc_oprnd1.val_class = dw_val_class_die_ref;
loc->dw_loc_oprnd1.v.val_die_ref.die = ref;
loc->dw_loc_oprnd1.v.val_die_ref.external = 0;
}
else
{
remove_AT (array_die, DW_AT_string_length);
remove_AT (array_die, dwarf_version >= 5
? DW_AT_string_length_byte_size
: DW_AT_byte_size);
}
}
}
/* This routine generates DIE for array with hidden descriptor, details
are filled into *info by a langhook. */
@ -22289,6 +22301,8 @@ gen_subprogram_die (tree decl, dw_die_ref context_die)
add_AT_location_description (subr_die, DW_AT_static_link,
loc_list_from_tree (fb_expr, 0, NULL));
}
resolve_variable_values ();
}
/* Generate child dies for template paramaters. */
@ -22321,9 +22335,6 @@ gen_subprogram_die (tree decl, dw_die_ref context_die)
tree generic_decl_parm = generic_decl
? DECL_ARGUMENTS (generic_decl)
: NULL;
auto_vec<dw_die_ref> string_types_vec;
if (string_types == NULL)
string_types = &string_types_vec;
/* Now we want to walk the list of parameters of the function and
emit their relevant DIEs.
@ -22386,14 +22397,6 @@ gen_subprogram_die (tree decl, dw_die_ref context_die)
else if (DECL_INITIAL (decl) == NULL_TREE)
gen_unspecified_parameters_die (decl, subr_die);
}
/* Adjust DW_TAG_string_type DIEs if needed, now that all arguments
have DIEs. */
if (string_types == &string_types_vec)
{
adjust_string_types ();
string_types = NULL;
}
}
if (subr_die != old_die)
@ -27532,6 +27535,18 @@ prune_unused_types_walk_loc_descr (dw_loc_descr_ref loc)
if (loc->dw_loc_oprnd1.val_class == dw_val_class_die_ref)
prune_unused_types_mark (loc->dw_loc_oprnd1.v.val_die_ref.die, 1);
break;
case DW_OP_GNU_variable_value:
if (loc->dw_loc_oprnd1.val_class == dw_val_class_decl_ref)
{
dw_die_ref ref
= lookup_decl_die (loc->dw_loc_oprnd1.v.val_decl_ref);
if (ref == NULL)
break;
loc->dw_loc_oprnd1.val_class = dw_val_class_die_ref;
loc->dw_loc_oprnd1.v.val_die_ref.die = ref;
loc->dw_loc_oprnd1.v.val_die_ref.external = 0;
}
/* FALLTHRU */
case DW_OP_call2:
case DW_OP_call4:
case DW_OP_call_ref:
@ -28300,7 +28315,7 @@ optimize_one_addr_into_implicit_ptr (dw_loc_descr_ref loc)
the location list couldn't be resolved. */
static bool
resolve_addr_in_expr (dw_loc_descr_ref loc)
resolve_addr_in_expr (dw_attr_node *a, dw_loc_descr_ref loc)
{
dw_loc_descr_ref keep = NULL;
for (dw_loc_descr_ref prev = NULL; loc; prev = loc, loc = loc->dw_loc_next)
@ -28360,6 +28375,7 @@ resolve_addr_in_expr (dw_loc_descr_ref loc)
case DW_OP_implicit_pointer:
case DW_OP_GNU_implicit_pointer:
case DW_OP_GNU_parameter_ref:
case DW_OP_GNU_variable_value:
if (loc->dw_loc_oprnd1.val_class == dw_val_class_decl_ref)
{
dw_die_ref ref
@ -28370,6 +28386,37 @@ resolve_addr_in_expr (dw_loc_descr_ref loc)
loc->dw_loc_oprnd1.v.val_die_ref.die = ref;
loc->dw_loc_oprnd1.v.val_die_ref.external = 0;
}
if (loc->dw_loc_opc == DW_OP_GNU_variable_value)
{
if (prev == NULL
&& loc->dw_loc_next == NULL
&& AT_class (a) == dw_val_class_loc)
switch (a->dw_attr)
{
/* Following attributes allow both exprloc and reference,
so if the whole expression is DW_OP_GNU_variable_value
alone we could transform it into reference. */
case DW_AT_byte_size:
case DW_AT_bit_size:
case DW_AT_lower_bound:
case DW_AT_upper_bound:
case DW_AT_bit_stride:
case DW_AT_count:
case DW_AT_allocated:
case DW_AT_associated:
case DW_AT_byte_stride:
a->dw_attr_val.val_class = dw_val_class_die_ref;
a->dw_attr_val.val_entry = NULL;
a->dw_attr_val.v.val_die_ref.die
= loc->dw_loc_oprnd1.v.val_die_ref.die;
a->dw_attr_val.v.val_die_ref.external = 0;
return true;
default:
break;
}
if (dwarf_strict)
return false;
}
break;
case DW_OP_const_type:
case DW_OP_regval_type:
@ -28544,18 +28591,18 @@ non_dwarf_expression (dw_loc_descr_ref l)
/* Return adjusted copy of EXPR:
If it is empty DWARF expression, return it.
If it is valid non-empty DWARF expression,
return copy of EXPR with copy of DEREF appended to it.
return copy of EXPR with DW_OP_deref appended to it.
If it is DWARF expression followed by DW_OP_reg{N,x}, return
copy of the DWARF expression with DW_OP_breg{N,x} <0> appended
and no DEREF.
copy of the DWARF expression with DW_OP_breg{N,x} <0> appended.
If it is DWARF expression followed by DW_OP_stack_value, return
copy of the DWARF expression without anything appended.
Otherwise, return NULL. */
static dw_loc_descr_ref
copy_deref_exprloc (dw_loc_descr_ref expr, dw_loc_descr_ref deref)
copy_deref_exprloc (dw_loc_descr_ref expr)
{
dw_loc_descr_ref tail = NULL;
if (expr == NULL)
return NULL;
@ -28566,26 +28613,24 @@ copy_deref_exprloc (dw_loc_descr_ref expr, dw_loc_descr_ref deref)
if (l)
{
if (l->dw_loc_opc >= DW_OP_reg0 && l->dw_loc_opc <= DW_OP_reg31)
deref = new_loc_descr ((enum dwarf_location_atom)
(DW_OP_breg0 + (l->dw_loc_opc - DW_OP_reg0)),
0, 0);
tail = new_loc_descr ((enum dwarf_location_atom)
(DW_OP_breg0 + (l->dw_loc_opc - DW_OP_reg0)),
0, 0);
else
switch (l->dw_loc_opc)
{
case DW_OP_regx:
deref = new_loc_descr (DW_OP_bregx,
l->dw_loc_oprnd1.v.val_unsigned, 0);
tail = new_loc_descr (DW_OP_bregx,
l->dw_loc_oprnd1.v.val_unsigned, 0);
break;
case DW_OP_stack_value:
deref = NULL;
break;
default:
return NULL;
}
}
else
deref = new_loc_descr (deref->dw_loc_opc,
deref->dw_loc_oprnd1.v.val_int, 0);
tail = new_loc_descr (DW_OP_deref, 0, 0);
dw_loc_descr_ref ret = NULL, *p = &ret;
while (expr != l)
@ -28596,29 +28641,55 @@ copy_deref_exprloc (dw_loc_descr_ref expr, dw_loc_descr_ref deref)
p = &(*p)->dw_loc_next;
expr = expr->dw_loc_next;
}
*p = deref;
*p = tail;
return ret;
}
/* For DW_AT_string_length attribute with DW_OP_call4 reference to a variable
or argument, adjust it if needed and return:
/* For DW_AT_string_length attribute with DW_OP_GNU_variable_value
reference to a variable or argument, adjust it if needed and return:
-1 if the DW_AT_string_length attribute and DW_AT_{string_length_,}byte_size
attribute if present should be removed
0 keep the attribute as is if the referenced var or argument has
only DWARF expression that covers all ranges
0 keep the attribute perhaps with minor modifications, no need to rescan
1 if the attribute has been successfully adjusted. */
static int
optimize_string_length (dw_attr_node *a)
{
dw_loc_descr_ref l = AT_loc (a), lv;
dw_die_ref die = l->dw_loc_oprnd1.v.val_die_ref.die;
dw_die_ref die;
if (l->dw_loc_oprnd1.val_class == dw_val_class_decl_ref)
{
tree decl = l->dw_loc_oprnd1.v.val_decl_ref;
die = lookup_decl_die (decl);
if (die)
{
l->dw_loc_oprnd1.val_class = dw_val_class_die_ref;
l->dw_loc_oprnd1.v.val_die_ref.die = die;
l->dw_loc_oprnd1.v.val_die_ref.external = 0;
}
else
return -1;
}
else
die = l->dw_loc_oprnd1.v.val_die_ref.die;
/* DWARF5 allows reference class, so we can then reference the DIE.
Only do this for DW_OP_GNU_variable_value DW_OP_stack_value. */
if (l->dw_loc_next != NULL && dwarf_version >= 5)
{
a->dw_attr_val.val_class = dw_val_class_die_ref;
a->dw_attr_val.val_entry = NULL;
a->dw_attr_val.v.val_die_ref.die = die;
a->dw_attr_val.v.val_die_ref.external = 0;
return 0;
}
dw_attr_node *av = get_AT (die, DW_AT_location);
dw_loc_list_ref d;
bool non_dwarf_expr = false;
if (av == NULL)
return -1;
return dwarf_strict ? -1 : 0;
switch (AT_class (av))
{
case dw_val_class_loc_list:
@ -28629,22 +28700,31 @@ optimize_string_length (dw_attr_node *a)
case dw_val_class_loc:
lv = AT_loc (av);
if (lv == NULL)
return -1;
return dwarf_strict ? -1 : 0;
if (non_dwarf_expression (lv))
non_dwarf_expr = true;
break;
default:
return -1;
return dwarf_strict ? -1 : 0;
}
/* If it is safe to keep DW_OP_call4 in, keep it. */
/* If it is safe to transform DW_OP_GNU_variable_value DW_OP_stack_value
into DW_OP_call4 or DW_OP_GNU_variable_value into
DW_OP_call4 DW_OP_deref, do so. */
if (!non_dwarf_expr
&& (l->dw_loc_next == NULL || AT_class (av) == dw_val_class_loc))
return 0;
&& (l->dw_loc_next != NULL || AT_class (av) == dw_val_class_loc))
{
l->dw_loc_opc = DW_OP_call4;
if (l->dw_loc_next)
l->dw_loc_next = NULL;
else
l->dw_loc_next = new_loc_descr (DW_OP_deref, 0, 0);
return 0;
}
/* If not dereferencing the DW_OP_call4 afterwards, we can just
/* For DW_OP_GNU_variable_value DW_OP_stack_value, we can just
copy over the DW_AT_location attribute from die to a. */
if (l->dw_loc_next == NULL)
if (l->dw_loc_next != NULL)
{
a->dw_attr_val = av->dw_attr_val;
return 1;
@ -28658,23 +28738,25 @@ optimize_string_length (dw_attr_node *a)
list = NULL;
for (d = AT_loc_list (av); d != NULL; d = d->dw_loc_next)
{
lv = copy_deref_exprloc (d->expr, l->dw_loc_next);
lv = copy_deref_exprloc (d->expr);
if (lv)
{
*p = new_loc_list (lv, d->begin, d->end, d->section);
p = &(*p)->dw_loc_next;
}
else if (!dwarf_strict && d->expr)
return 0;
}
if (list == NULL)
return -1;
return dwarf_strict ? -1 : 0;
a->dw_attr_val.val_class = dw_val_class_loc_list;
gen_llsym (list);
*AT_loc_list_ptr (a) = list;
return 1;
case dw_val_class_loc:
lv = copy_deref_exprloc (AT_loc (av), l->dw_loc_next);
lv = copy_deref_exprloc (AT_loc (av));
if (lv == NULL)
return -1;
return dwarf_strict ? -1 : 0;
a->dw_attr_val.v.val_loc = lv;
return 1;
default:
@ -28720,7 +28802,7 @@ resolve_addr (dw_die_ref die)
while (*curr)
{
gcc_assert (!(*curr)->replaced && !(*curr)->resolved_addr);
if (!resolve_addr_in_expr ((*curr)->expr))
if (!resolve_addr_in_expr (a, (*curr)->expr))
{
dw_loc_list_ref next = (*curr)->dw_loc_next;
dw_loc_descr_ref l = (*curr)->expr;
@ -28757,19 +28839,19 @@ resolve_addr (dw_die_ref die)
case dw_val_class_loc:
{
dw_loc_descr_ref l = AT_loc (a);
/* Using DW_OP_call4 or DW_OP_call4 DW_OP_deref in
DW_AT_string_length is only a rough approximation; unfortunately
DW_AT_string_length can't be a reference to a DIE. DW_OP_call4
needs a DWARF expression, while DW_AT_location of the referenced
variable or argument might be any location description. */
/* DW_OP_GNU_variable_value DW_OP_stack_value or
DW_OP_GNU_variable_value in DW_AT_string_length can be converted
into DW_OP_call4 or DW_OP_call4 DW_OP_deref, which is standard
DWARF4 unlike DW_OP_GNU_variable_value. Or for DWARF5
DW_OP_GNU_variable_value DW_OP_stack_value can be replaced
with DW_FORM_ref referencing the same DIE as
DW_OP_GNU_variable_value used to reference. */
if (a->dw_attr == DW_AT_string_length
&& l
&& l->dw_loc_opc == DW_OP_call4
&& l->dw_loc_oprnd1.val_class == dw_val_class_die_ref
&& l->dw_loc_opc == DW_OP_GNU_variable_value
&& (l->dw_loc_next == NULL
|| (l->dw_loc_next->dw_loc_next == NULL
&& (l->dw_loc_next->dw_loc_opc == DW_OP_deref
|| l->dw_loc_next->dw_loc_opc != DW_OP_deref_size))))
&& l->dw_loc_next->dw_loc_opc == DW_OP_stack_value)))
{
switch (optimize_string_length (a))
{
@ -28799,7 +28881,7 @@ resolve_addr (dw_die_ref die)
|| l == NULL
|| l->dw_loc_opc != DW_OP_plus_uconst
|| l->dw_loc_next != NULL)
&& !resolve_addr_in_expr (l))
&& !resolve_addr_in_expr (a, l))
{
if (dwarf_split_debug_info)
remove_loc_list_addr_table_entries (l);
@ -28816,6 +28898,10 @@ resolve_addr (dw_die_ref die)
optimize_location_into_implicit_ptr (die, decl);
break;
}
if (a->dw_attr == DW_AT_string_length)
/* If we drop DW_AT_string_length, we need to drop also
DW_AT_{string_length_,}byte_size. */
remove_AT_byte_size = true;
remove_AT (die, a->dw_attr);
ix--;
}
@ -29874,6 +29960,262 @@ dwarf2out_finish (const char *)
}
}
/* Returns a hash value for X (which really is a variable_value_struct). */
inline hashval_t
variable_value_hasher::hash (variable_value_struct *x)
{
return (hashval_t) x->decl_id;
}
/* Return nonzero if decl_id of variable_value_struct X is the same as
UID of decl Y. */
inline bool
variable_value_hasher::equal (variable_value_struct *x, tree y)
{
return x->decl_id == DECL_UID (y);
}
/* Helper function for resolve_variable_value, handle
DW_OP_GNU_variable_value in one location expression.
Return true if exprloc has been changed into loclist. */
static bool
resolve_variable_value_in_expr (dw_attr_node *a, dw_loc_descr_ref loc)
{
dw_loc_descr_ref next;
for (dw_loc_descr_ref prev = NULL; loc; prev = loc, loc = next)
{
next = loc->dw_loc_next;
if (loc->dw_loc_opc != DW_OP_GNU_variable_value
|| loc->dw_loc_oprnd1.val_class != dw_val_class_decl_ref)
continue;
tree decl = loc->dw_loc_oprnd1.v.val_decl_ref;
if (DECL_CONTEXT (decl) != current_function_decl)
continue;
dw_die_ref ref = lookup_decl_die (decl);
if (ref)
{
loc->dw_loc_oprnd1.val_class = dw_val_class_die_ref;
loc->dw_loc_oprnd1.v.val_die_ref.die = ref;
loc->dw_loc_oprnd1.v.val_die_ref.external = 0;
continue;
}
dw_loc_list_ref l = loc_list_from_tree (decl, 0, NULL);
if (l == NULL)
continue;
if (l->dw_loc_next)
{
if (AT_class (a) != dw_val_class_loc)
continue;
switch (a->dw_attr)
{
/* Following attributes allow both exprloc and loclist
classes, so we can change them into a loclist. */
case DW_AT_location:
case DW_AT_string_length:
case DW_AT_return_addr:
case DW_AT_data_member_location:
case DW_AT_frame_base:
case DW_AT_segment:
case DW_AT_static_link:
case DW_AT_use_location:
case DW_AT_vtable_elem_location:
if (prev)
{
prev->dw_loc_next = NULL;
prepend_loc_descr_to_each (l, AT_loc (a));
}
if (next)
add_loc_descr_to_each (l, next);
a->dw_attr_val.val_class = dw_val_class_loc_list;
a->dw_attr_val.val_entry = NULL;
a->dw_attr_val.v.val_loc_list = l;
have_location_lists = true;
return true;
/* Following attributes allow both exprloc and reference,
so if the whole expression is DW_OP_GNU_variable_value alone
we could transform it into reference. */
case DW_AT_byte_size:
case DW_AT_bit_size:
case DW_AT_lower_bound:
case DW_AT_upper_bound:
case DW_AT_bit_stride:
case DW_AT_count:
case DW_AT_allocated:
case DW_AT_associated:
case DW_AT_byte_stride:
if (prev == NULL && next == NULL)
break;
/* FALLTHRU */
default:
if (dwarf_strict)
continue;
break;
}
/* Create DW_TAG_variable that we can refer to. */
ref = gen_decl_die (decl, NULL_TREE, NULL,
lookup_decl_die (current_function_decl));
if (ref)
{
loc->dw_loc_oprnd1.val_class = dw_val_class_die_ref;
loc->dw_loc_oprnd1.v.val_die_ref.die = ref;
loc->dw_loc_oprnd1.v.val_die_ref.external = 0;
}
continue;
}
if (prev)
{
prev->dw_loc_next = l->expr;
add_loc_descr (&prev->dw_loc_next, next);
free_loc_descr (loc, NULL);
next = prev->dw_loc_next;
}
else
{
memcpy (loc, l->expr, sizeof (dw_loc_descr_node));
add_loc_descr (&loc, next);
next = loc;
}
loc = prev;
}
return false;
}
/* Attempt to resolve DW_OP_GNU_variable_value using loc_list_from_tree. */
static void
resolve_variable_value (dw_die_ref die)
{
dw_attr_node *a;
dw_loc_list_ref loc;
unsigned ix;
FOR_EACH_VEC_SAFE_ELT (die->die_attr, ix, a)
switch (AT_class (a))
{
case dw_val_class_loc:
if (!resolve_variable_value_in_expr (a, AT_loc (a)))
break;
/* FALLTHRU */
case dw_val_class_loc_list:
loc = AT_loc_list (a);
gcc_assert (loc);
for (; loc; loc = loc->dw_loc_next)
resolve_variable_value_in_expr (a, loc->expr);
break;
default:
break;
}
}
/* Attempt to optimize DW_OP_GNU_variable_value refering to
temporaries in the current function. */
static void
resolve_variable_values (void)
{
if (!variable_value_hash || !current_function_decl)
return;
struct variable_value_struct *node
= variable_value_hash->find_with_hash (current_function_decl,
DECL_UID (current_function_decl));
if (node == NULL)
return;
unsigned int i;
dw_die_ref die;
FOR_EACH_VEC_SAFE_ELT (node->dies, i, die)
resolve_variable_value (die);
}
/* Helper function for note_variable_value, handle one location
expression. */
static void
note_variable_value_in_expr (dw_die_ref die, dw_loc_descr_ref loc)
{
for (; loc; loc = loc->dw_loc_next)
if (loc->dw_loc_opc == DW_OP_GNU_variable_value
&& loc->dw_loc_oprnd1.val_class == dw_val_class_decl_ref)
{
tree decl = loc->dw_loc_oprnd1.v.val_decl_ref;
dw_die_ref ref = lookup_decl_die (decl);
if (ref)
{
loc->dw_loc_oprnd1.val_class = dw_val_class_die_ref;
loc->dw_loc_oprnd1.v.val_die_ref.die = ref;
loc->dw_loc_oprnd1.v.val_die_ref.external = 0;
}
if (VAR_P (decl)
&& DECL_CONTEXT (decl)
&& TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL
&& lookup_decl_die (DECL_CONTEXT (decl)))
{
if (!variable_value_hash)
variable_value_hash
= hash_table<variable_value_hasher>::create_ggc (10);
tree fndecl = DECL_CONTEXT (decl);
struct variable_value_struct *node;
struct variable_value_struct **slot
= variable_value_hash->find_slot_with_hash (fndecl,
DECL_UID (fndecl),
INSERT);
if (*slot == NULL)
{
node = ggc_cleared_alloc<variable_value_struct> ();
node->decl_id = DECL_UID (fndecl);
*slot = node;
}
else
node = *slot;
vec_safe_push (node->dies, die);
}
}
}
/* Walk the tree DIE and note DIEs with DW_OP_GNU_variable_value still
with dw_val_class_decl_ref operand. */
static void
note_variable_value (dw_die_ref die)
{
dw_die_ref c;
dw_attr_node *a;
dw_loc_list_ref loc;
unsigned ix;
FOR_EACH_VEC_SAFE_ELT (die->die_attr, ix, a)
switch (AT_class (a))
{
case dw_val_class_loc_list:
loc = AT_loc_list (a);
gcc_assert (loc);
if (!loc->noted_variable_value)
{
loc->noted_variable_value = 1;
for (; loc; loc = loc->dw_loc_next)
note_variable_value_in_expr (die, loc->expr);
}
break;
case dw_val_class_loc:
note_variable_value_in_expr (die, AT_loc (a));
break;
default:
break;
}
/* Mark children. */
FOR_EACH_CHILD (die, c, note_variable_value (c));
}
/* Perform any cleanups needed after the early debug generation pass
has run. */
@ -30000,6 +30342,17 @@ dwarf2out_early_finish (const char *filename)
}
}
/* Traverse the DIE's and note DIEs with DW_OP_GNU_variable_value still
with dw_val_class_decl_ref operand. */
note_variable_value (comp_unit_die ());
for (limbo_die_node *node = cu_die_list; node; node = node->next)
note_variable_value (node->die);
for (comdat_type_node *ctnode = comdat_type_list; ctnode != NULL;
ctnode = ctnode->next)
note_variable_value (ctnode->root_die);
for (limbo_die_node *node = limbo_die_list; node; node = node->next)
note_variable_value (node->die);
/* The early debug phase is now finished. */
early_dwarf_finished = true;
}

5
include/ChangeLog
View File

@ -1,3 +1,8 @@
2017-02-25 Jakub Jelinek <jakub@redhat.com>
PR debug/77589
* dwarf2.def (DW_OP_GNU_variable_value): New opcode.
2017-01-30 Alexandre Oliva <aoliva@redhat.com>
Introduce C++ support in libcc1.

3
include/dwarf2.def
View File

@ -675,6 +675,9 @@ DW_OP (DW_OP_GNU_parameter_ref, 0xfa)
/* Extensions for Fission. See http://gcc.gnu.org/wiki/DebugFission. */
DW_OP (DW_OP_GNU_addr_index, 0xfb)
DW_OP (DW_OP_GNU_const_index, 0xfc)
/* The GNU variable value extension.
See http://dwarfstd.org/ShowIssue.php?issue=161109.2 . */
DW_OP (DW_OP_GNU_variable_value, 0xfd)
/* HP extensions. */
DW_OP_DUP (DW_OP_HP_unknown, 0xe0) /* Ouch, the same as GNU_push_tls_address. */
DW_OP (DW_OP_HP_is_value, 0xe1)