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gdb/gdb-vla-intel-02of23.patch

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Subject: [PATCH 02/23] dwarf: add DW_AT_data_location support
Message-Id: <1401861266-6240-3-git-send-email-keven.boell@intel.com>
An object might have a descriptor proceeding the actual value.
To point the debugger to the actually value of an object
DW_AT_data_location is used for. For example the compile may
emit for this entity:
1| int foo[N];
the following descriptor:
struct array {
size_t size;
void* data; // DW_AT_data_location describes this location
}
This allows GDB to print the actual data of an type.
2014-05-28 Sanimir Agovic <sanimir.agovic@intel.com>
Keven Boell <keven.boell@intel.com>
* dwarf2read.c (set_die_type): Parse and save DW_AT_data_location
attribute.
* gdbtypes.c (is_dynamic_type): Consider a type being dynamic if
the data location has not yet been resolved.
(resolve_dynamic_type): Evaluate data location baton
if present and save its value.
* gdbtypes.h <main_type>: Add data_location.
(TYPE_DATA_LOCATION): New macro.
(TYPE_DATA_LOCATION_ADDR): New macro.
(TYPE_DATA_LOCATION_IS_ADDRESS): New macro.
* value.c: Include dwarf2loc.h.
(value_fetch_lazy): Use data location addres to read value from
memory.
(coerce_ref): Construct new value from data location.
Change-Id: Ic633fa125efdb5e438204e4f80bb3a1c97758b12
Signed-off-by: Keven Boell <keven.boell@intel.com>
---
gdb/dwarf2read.c | 15 +++++++++++++++
gdb/gdbtypes.c | 29 +++++++++++++++++++++++++++--
gdb/gdbtypes.h | 14 ++++++++++++++
gdb/value.c | 8 +++++++-
4 files changed, 63 insertions(+), 3 deletions(-)
Index: gdb-7.7.90.20140613/gdb/dwarf2read.c
===================================================================
--- gdb-7.7.90.20140613.orig/gdb/dwarf2read.c 2014-06-14 15:06:00.834714409 +0200
+++ gdb-7.7.90.20140613/gdb/dwarf2read.c 2014-06-14 15:06:08.326719753 +0200
@@ -21642,6 +21642,7 @@ set_die_type (struct die_info *die, stru
{
struct dwarf2_per_cu_offset_and_type **slot, ofs;
struct objfile *objfile = cu->objfile;
+ struct attribute *attr;
/* For Ada types, make sure that the gnat-specific data is always
initialized (if not already set). There are a few types where
@@ -21656,6 +21657,20 @@ set_die_type (struct die_info *die, stru
&& !HAVE_GNAT_AUX_INFO (type))
INIT_GNAT_SPECIFIC (type);
+ /* Read DW_AT_data_location and set in type. */
+ attr = dwarf2_attr (die, DW_AT_data_location, cu);
+ if (attr_form_is_block (attr))
+ {
+ struct dynamic_prop prop;
+
+ if (attr_to_dynamic_prop (attr, die, cu, &prop))
+ {
+ TYPE_DATA_LOCATION (type)
+ = obstack_alloc (&objfile->objfile_obstack, sizeof (prop));
+ *TYPE_DATA_LOCATION (type) = prop;
+ }
+ }
+
if (dwarf2_per_objfile->die_type_hash == NULL)
{
dwarf2_per_objfile->die_type_hash =
Index: gdb-7.7.90.20140613/gdb/gdbtypes.c
===================================================================
--- gdb-7.7.90.20140613.orig/gdb/gdbtypes.c 2014-06-14 15:06:00.836714410 +0200
+++ gdb-7.7.90.20140613/gdb/gdbtypes.c 2014-06-14 15:12:28.963986344 +0200
@@ -1634,7 +1634,12 @@ is_dynamic_type (struct type *type)
or the elements it contains have a dynamic contents. */
if (is_dynamic_type (TYPE_INDEX_TYPE (type)))
return 1;
- return is_dynamic_type (TYPE_TARGET_TYPE (type));
+ else if (TYPE_DATA_LOCATION (type) != NULL
+ && (TYPE_DATA_LOCATION_KIND (type) == PROP_LOCEXPR
+ || TYPE_DATA_LOCATION_KIND (type) == PROP_LOCLIST))
+ return 1;
+ else
+ return is_dynamic_type (TYPE_TARGET_TYPE (type));
}
case TYPE_CODE_STRUCT:
@@ -1830,6 +1835,8 @@ resolve_dynamic_type (struct type *type,
{
struct type *real_type = check_typedef (type);
struct type *resolved_type = type;
+ const struct dynamic_prop *prop;
+ CORE_ADDR value;
if (!is_dynamic_type (real_type))
return type;
@@ -1869,6 +1876,18 @@ resolve_dynamic_type (struct type *type,
break;
}
+ type = resolved_type;
+
+ /* Resolve data_location attribute. */
+ prop = TYPE_DATA_LOCATION (type);
+ if (dwarf2_evaluate_property (prop, addr, &value))
+ {
+ TYPE_DATA_LOCATION_ADDR (type) = value;
+ TYPE_DATA_LOCATION_KIND (type) = PROP_CONST;
+ }
+ else
+ TYPE_DATA_LOCATION (type) = NULL;
+
return resolved_type;
}
@@ -4078,6 +4097,13 @@ copy_type_recursive (struct objfile *obj
*TYPE_RANGE_DATA (new_type) = *TYPE_RANGE_DATA (type);
}
+ /* Copy the data location information. */
+ if (TYPE_DATA_LOCATION (type) != NULL)
+ {
+ TYPE_DATA_LOCATION (new_type) = xmalloc (sizeof (struct dynamic_prop));
+ *TYPE_DATA_LOCATION (new_type) = *TYPE_DATA_LOCATION (type);
+ }
+
/* Copy pointers to other types. */
if (TYPE_TARGET_TYPE (type))
TYPE_TARGET_TYPE (new_type) =
Index: gdb-7.7.90.20140613/gdb/gdbtypes.h
===================================================================
--- gdb-7.7.90.20140613.orig/gdb/gdbtypes.h 2014-06-14 15:06:00.837714411 +0200
+++ gdb-7.7.90.20140613/gdb/gdbtypes.h 2014-06-14 15:06:08.328719754 +0200
@@ -725,6 +725,10 @@ struct main_type
struct func_type *func_stuff;
} type_specific;
+
+ /* * Indirection to actual data. */
+
+ struct dynamic_prop *data_location;
};
/* * A ``struct type'' describes a particular instance of a type, with
@@ -1204,6 +1208,16 @@ extern void allocate_gnat_aux_type (stru
#define TYPE_LOW_BOUND_KIND(range_type) \
TYPE_RANGE_DATA(range_type)->low.kind
+/* Attribute accessors for VLA support. */
+#define TYPE_DATA_LOCATION(thistype) \
+ TYPE_MAIN_TYPE(thistype)->data_location
+#define TYPE_DATA_LOCATION_BATON(thistype) \
+ TYPE_DATA_LOCATION (thistype)->data.baton
+#define TYPE_DATA_LOCATION_ADDR(thistype) \
+ TYPE_DATA_LOCATION (thistype)->data.const_val
+#define TYPE_DATA_LOCATION_KIND(thistype) \
+ TYPE_DATA_LOCATION (thistype)->kind
+
/* Moto-specific stuff for FORTRAN arrays. */
#define TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED(arraytype) \
Index: gdb-7.7.90.20140613/gdb/value.c
===================================================================
--- gdb-7.7.90.20140613.orig/gdb/value.c 2014-06-14 15:06:00.838714412 +0200
+++ gdb-7.7.90.20140613/gdb/value.c 2014-06-14 15:06:08.329719755 +0200
@@ -3699,8 +3699,14 @@ value_fetch_lazy (struct value *val)
}
else if (VALUE_LVAL (val) == lval_memory)
{
- CORE_ADDR addr = value_address (val);
struct type *type = check_typedef (value_enclosing_type (val));
+ CORE_ADDR addr;
+
+ if (TYPE_DATA_LOCATION (type) != NULL
+ && TYPE_DATA_LOCATION_KIND (type) == PROP_CONST)
+ addr = TYPE_DATA_LOCATION_ADDR (type);
+ else
+ addr = value_address (val);
if (TYPE_LENGTH (type))
read_value_memory (val, 0, value_stack (val),
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