[PATCH v3 02/13] type: add c99 variable length array support

[PATCH v3 02/13] type: add c99 variable length array support

[Sanimir Agovic]

The dwarf standard allow certain attributes to be expressed as dwarf
expressions rather than constants. For instance upper-/lowerbound attributes.
In case of a c99 variable length array the upperbound is a dynamic attribute.

With this change c99 vla behave the same as with static arrays.

1| void foo (size_t n) {
2|   int ary[n];
3|   memset(ary, 0, sizeof(ary));
4| }

(gdb) print ary
$1 = {0 <repeats 42 times>}

2013-10-18  Sanimir Agovic  <sanimir.agovic@intel.com>
            Keven Boell  <keven.boell@intel.com>

	* dwarf2loc.c (dwarf2_locexpr_baton_eval): New function.
	(dwarf2_evaluate_property): New function.
	* dwarf2loc.h (dwarf2_evaluate_property): New function prototype.
	* dwarf2read.c (block_to_locexprbaton): New function.
	(attr_to_dynamic_prop): New function.
	(read_subrange_type): Use attr_to_dynamic_prop to read high bound
	attribute.
	* gdbtypes.c: Include dwarf2loc.h.
	(is_dynamic_type): New function.
	(resolve_dynamic_type): New function.
	(resolve_dynamic_bounds): New function.
	(get_type_length): New function.
	(check_typedef): Use get_type_length to compute type length.
	* gdbtypes.h (TYPE_HIGH_BOUND_KIND): New macro.
	(TYPE_LOW_BOUND_KIND): New macro.
	(is_dynamic_type): New function prototype.

Change-Id: I59036232c0b93e79427bf34041b3bbf8992e731a
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/dwarf2loc.c  | 105 +++++++++++++++++++++++
 gdb/dwarf2loc.h  |  26 ++++++
 gdb/dwarf2read.c | 132 +++++++++++++++++++++++------
 gdb/gdbtypes.c   | 248 +++++++++++++++++++++++++++++++++++++++++++------------
 gdb/gdbtypes.h   |  10 +++
 gdb/value.c      |  11 ++-
 6 files changed, 449 insertions(+), 83 deletions(-)

diff --git a/gdb/dwarf2loc.c b/gdb/dwarf2loc.c
index 2d15546..9fcfe21 100644
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -2430,6 +2430,111 @@ dwarf2_evaluate_loc_desc (struct type *type, struct frame_info *frame,
   return dwarf2_evaluate_loc_desc_full (type, frame, data, size, per_cu, 0);
 }
 
+/* Evaluates a dwarf expression and stores the result in VAL, expecting
+   that the dwarf expression only produces a single CORE_ADDR.  ADDR is a
+   context (location of a variable) and might be needed to evaluate the
+   location expression.
+   Returns 1 on success, 0 otherwise.   */
+
+static int
+dwarf2_locexpr_baton_eval (const struct dwarf2_locexpr_baton *dlbaton,
+			   CORE_ADDR addr, CORE_ADDR *valp)
+{
+  struct dwarf_expr_context *ctx;
+  struct dwarf_expr_baton baton;
+  struct objfile *objfile;
+  struct cleanup *cleanup;
+
+  if (dlbaton == NULL || dlbaton->size == 0)
+    return 0;
+
+  ctx = new_dwarf_expr_context ();
+  cleanup = make_cleanup_free_dwarf_expr_context (ctx);
+
+  baton.frame = get_selected_frame (NULL);
+  baton.per_cu = dlbaton->per_cu;
+
+  objfile = dwarf2_per_cu_objfile (dlbaton->per_cu);
+
+  ctx->gdbarch = get_objfile_arch (objfile);
+  ctx->addr_size = dwarf2_per_cu_addr_size (dlbaton->per_cu);
+  ctx->ref_addr_size = dwarf2_per_cu_ref_addr_size (dlbaton->per_cu);
+  ctx->offset = dwarf2_per_cu_text_offset (dlbaton->per_cu);
+  ctx->funcs = &dwarf_expr_ctx_funcs;
+  ctx->baton = &baton;
+
+  dwarf_expr_eval (ctx, dlbaton->data, dlbaton->size);
+
+  switch (ctx->location)
+    {
+    case DWARF_VALUE_REGISTER:
+    case DWARF_VALUE_MEMORY:
+    case DWARF_VALUE_STACK:
+      *valp = dwarf_expr_fetch_address (ctx, 0);
+      if (ctx->location == DWARF_VALUE_REGISTER)
+	*valp = dwarf_expr_read_addr_from_reg (&baton, *valp);
+      do_cleanups (cleanup);
+      return 1;
+    case DWARF_VALUE_LITERAL:
+      *valp = extract_signed_integer (ctx->data, ctx->len,
+				      gdbarch_byte_order (ctx->gdbarch));
+      do_cleanups (cleanup);
+      return 1;
+      /* Not supported dwarf values.  */
+    case DWARF_VALUE_OPTIMIZED_OUT:
+    case DWARF_VALUE_IMPLICIT_POINTER:
+      break;
+    }
+
+  do_cleanups (cleanup);
+
+  return 0;
+}
+
+/* See dwarf2loc.h.  */
+
+int
+dwarf2_evaluate_property (const struct dynamic_prop *prop, CORE_ADDR address,
+			  CORE_ADDR *value)
+{
+  if (prop == NULL)
+    return 0;
+
+  switch (prop->kind)
+    {
+    case PROP_LOCEXPR:
+      {
+	const struct dwarf2_property_baton *baton = prop->data.baton;
+
+	return dwarf2_locexpr_baton_eval (&baton->locexpr, address, value);
+      }
+    case PROP_LOCLIST:
+      {
+	struct dwarf2_property_baton *baton = prop->data.baton;
+	struct frame_info *frame = get_selected_frame (NULL);
+	CORE_ADDR pc = get_frame_address_in_block (frame);
+	const gdb_byte *data;
+	struct value *val;
+	size_t size;
+
+	data = dwarf2_find_location_expression (&baton->loc.list, &size, pc);
+	if (data != NULL)
+	  {
+	    val = dwarf2_evaluate_loc_desc (baton->loc.type, frame, data,
+					    size, baton->loc.list.per_cu);
+	    if (!value_optimized_out (val))
+	      *value = value_as_long (value_ind (val));
+	  }
+	return 1;
+      }
+    case PROP_CONST:
+      *value = prop->data.const_val;
+      return 1;
+    }
+
+  return 0;
+}
+
 \f
 /* Helper functions and baton for dwarf2_loc_desc_needs_frame.  */
 
diff --git a/gdb/dwarf2loc.h b/gdb/dwarf2loc.h
index 9bc8ca5..2155fe1 100644
--- a/gdb/dwarf2loc.h
+++ b/gdb/dwarf2loc.h
@@ -90,6 +90,13 @@ struct value *dwarf2_evaluate_loc_desc (struct type *type,
 					size_t size,
 					struct dwarf2_per_cu_data *per_cu);
 
+/* Converts a dynamic property into a static one.  ADDR is the address of
+   the object currently being evaluated and might be nedded.
+   Returns 1 if PROP could be converted and the static value is passed back
+   into VALUE, otherwise returns 0.  */
+int dwarf2_evaluate_property (const struct dynamic_prop *prop,
+			      CORE_ADDR addr, CORE_ADDR *value);
+
 CORE_ADDR dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
 				  unsigned int addr_index);
 
@@ -135,6 +142,25 @@ struct dwarf2_loclist_baton
   unsigned char from_dwo;
 };
 
+/* A dynamic property is either expressed as a single location expression
+   or a location list in the context of TYPE.  */
+
+struct dwarf2_property_baton
+{
+  union
+  {
+    /* Location expression.  */
+    struct dwarf2_locexpr_baton locexpr;
+
+    /* Location list to be evaluated in the context of TYPE.  */
+    struct
+    {
+      struct dwarf2_loclist_baton list;
+      struct type *type;
+    } loc;
+  };
+};
+
 extern const struct symbol_computed_ops dwarf2_locexpr_funcs;
 extern const struct symbol_computed_ops dwarf2_loclist_funcs;
 
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 6bdd45a..0df385a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -14252,6 +14252,110 @@ read_base_type (struct die_info *die, struct dwarf2_cu *cu)
   return set_die_type (die, type, cu);
 }
 
+/* Turn Dwarf block into location expression baton structure. Used to store
+   baton into "dynamic" types, e.g. VLA's.  Specifing ADDITIONAL_DATA and
+   EXTRA_SIZE allows to append additional opcodes to the dwarf expression.  */
+
+static struct dwarf2_locexpr_baton
+block_to_locexpr_baton (const struct dwarf_block *blk, struct dwarf2_cu *cu,
+			const gdb_byte *additional_data, int extra_size)
+{
+  struct dwarf2_locexpr_baton baton;
+
+  gdb_assert (blk != NULL);
+
+  baton.per_cu = cu->per_cu;
+  baton.size = blk->size + extra_size;
+
+  if (additional_data != NULL && extra_size > 0)
+    {
+      gdb_byte *data;
+
+      data = obstack_alloc (&cu->objfile->objfile_obstack, baton.size);
+      baton.data = data;
+
+      memcpy (data, blk->data, blk->size);
+      memcpy (data + blk->size, additional_data, extra_size);
+    }
+  else
+    /* Copy the data pointer as the block's lifetime is bound to its
+       object file. */
+    baton.data = blk->data;
+
+  gdb_assert (baton.data != NULL);
+
+  return baton;
+}
+
+/* Parse dwarf attribute if it's a block, reference or constant and put the
+   resulting value of the attribute into struct bound_prop.
+   Returns 1 if ATTR could be resolved into PROP, 0 otherwise.  */
+
+static int
+attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
+		      struct dwarf2_cu *cu, struct dynamic_prop *prop)
+{
+  struct dwarf2_property_baton *baton;
+  struct obstack *obstack = &cu->objfile->objfile_obstack;
+
+  if (attr == NULL || prop == NULL)
+    return 0;
+
+  if (attr_form_is_block (attr))
+    {
+      baton = obstack_alloc (obstack, sizeof (*baton));
+      baton->locexpr = block_to_locexpr_baton (DW_BLOCK (attr), cu, NULL, 0);
+      prop->data.baton = baton;
+      prop->kind = PROP_LOCEXPR;
+      gdb_assert (prop->data.baton != NULL);
+    }
+  else if (attr_form_is_ref (attr))
+    {
+      struct dwarf2_cu *target_cu = cu;
+      struct die_info *target_die;
+      struct attribute *target_attr;
+
+      target_die = follow_die_ref (die, attr, &target_cu);
+      target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
+      if (target_attr == NULL)
+	return 0;
+
+      if (attr_form_is_section_offset (target_attr))
+	{
+	  baton = obstack_alloc (obstack, sizeof (*baton));
+	  baton->loc.type = die_type (target_die, target_cu);;
+	  fill_in_loclist_baton (cu, &baton->loc.list, target_attr);
+	  prop->data.baton = baton;
+	  prop->kind = PROP_LOCLIST;
+	  gdb_assert (prop->data.baton != NULL);
+	}
+      else if (attr_form_is_block (target_attr))
+	{
+	  const gdb_byte ops[] = {DW_OP_deref};
+
+	  baton = obstack_alloc (obstack, sizeof (*baton));
+	  baton->locexpr = block_to_locexpr_baton (DW_BLOCK (target_attr),
+						   cu, ops, sizeof (ops));
+	  prop->data.baton = baton;
+	  prop->kind = PROP_LOCEXPR;
+	  gdb_assert (prop->data.baton != NULL);
+	}
+    }
+  else if (attr_form_is_constant (attr))
+    {
+      prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
+      prop->kind = PROP_CONST;
+    }
+  else
+    {
+      dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
+					     dwarf2_name (die, cu));
+      return 0;
+    }
+
+  return 1;
+}
+
 /* Read the given DW_AT_subrange DIE.  */
 
 static struct type *
@@ -14325,27 +14429,7 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
 	       die->offset.sect_off, objfile_name (cu->objfile));
 
   attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
-  if (attr)
-    {
-      if (attr_form_is_block (attr) || attr_form_is_ref (attr))
-        {
-          /* GCC encodes arrays with unspecified or dynamic length
-             with a DW_FORM_block1 attribute or a reference attribute.
-             FIXME: GDB does not yet know how to handle dynamic
-             arrays properly, treat them as arrays with unspecified
-             length for now.
-
-             FIXME: jimb/2003-09-22: GDB does not really know
-             how to handle arrays of unspecified length
-             either; we just represent them as zero-length
-             arrays.  Choose an appropriate upper bound given
-             the lower bound we've computed above.  */
-          high.data.const_val = low.data.const_val - 1;
-        }
-      else
-        high.data.const_val = dwarf2_get_attr_constant_value (attr, 1);
-    }
-  else
+  if (!attr_to_dynamic_prop (attr, die, cu, &high))
     {
       attr = dwarf2_attr (die, DW_AT_count, cu);
       if (attr)
@@ -14409,12 +14493,6 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
 
   range_type = create_range_type_1 (NULL, orig_base_type, &low, &high);
 
-  /* Mark arrays with dynamic length at least as an array of unspecified
-     length.  GDB could check the boundary but before it gets implemented at
-     least allow accessing the array elements.  */
-  if (attr && attr_form_is_block (attr))
-    TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
-
   /* Ada expects an empty array on no boundary attributes.  */
   if (attr == NULL && cu->language != language_ada)
     TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index 276ebe3..59aaf3d 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -1,5 +1,6 @@
 /* Support routines for manipulating internal types for GDB.
 
+
    Copyright (C) 1992-2013 Free Software Foundation, Inc.
 
    Contributed by Cygnus Support, using pieces from other GDB modules.
@@ -38,6 +39,7 @@
 #include "hashtab.h"
 #include "exceptions.h"
 #include "cp-support.h"
+#include "dwarf2loc.h"
 
 /* Initialize BADNESS constants.  */
 
@@ -852,6 +854,17 @@ create_range_type (struct type *result_type, struct type *index_type,
   return result_type;
 }
 
+/* Predicate tests whether BOUNDS are static.  Returns 1 if all bounds values
+   are static, otherwise returns 0.  */
+
+static int
+has_static_range (const struct range_bounds *bounds)
+{
+  return (bounds->low.kind == PROP_CONST
+	  && bounds->high.kind == PROP_CONST);
+}
+
+
 /* Set *LOWP and *HIGHP to the lower and upper bounds of discrete type
    TYPE.  Return 1 if type is a range type, 0 if it is discrete (and
    bounds will fit in LONGEST), or -1 otherwise.  */
@@ -981,24 +994,28 @@ create_array_type (struct type *result_type,
 		   struct type *element_type,
 		   struct type *range_type)
 {
-  LONGEST low_bound, high_bound;
-
   if (result_type == NULL)
     result_type = alloc_type_copy (range_type);
 
   TYPE_CODE (result_type) = TYPE_CODE_ARRAY;
   TYPE_TARGET_TYPE (result_type) = element_type;
-  if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
-    low_bound = high_bound = 0;
-  CHECK_TYPEDEF (element_type);
-  /* Be careful when setting the array length.  Ada arrays can be
-     empty arrays with the high_bound being smaller than the low_bound.
-     In such cases, the array length should be zero.  */
-  if (high_bound < low_bound)
-    TYPE_LENGTH (result_type) = 0;
-  else
-    TYPE_LENGTH (result_type) =
-      TYPE_LENGTH (element_type) * (high_bound - low_bound + 1);
+
+  if (has_static_range (TYPE_RANGE_DATA (range_type)))
+    {
+      LONGEST low_bound, high_bound;
+
+      if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0)
+	low_bound = high_bound = 0;
+      CHECK_TYPEDEF (element_type);
+      /* Be careful when setting the array length.  Ada arrays can be
+	 empty arrays with the high_bound being smaller than the low_bound.
+	 In such cases, the array length should be zero.  */
+      if (high_bound < low_bound)
+	TYPE_LENGTH (result_type) = 0;
+      else
+	TYPE_LENGTH (result_type) =
+	  TYPE_LENGTH (element_type) * (high_bound - low_bound + 1);
+    }
   TYPE_NFIELDS (result_type) = 1;
   TYPE_FIELDS (result_type) =
     (struct field *) TYPE_ZALLOC (result_type, sizeof (struct field));
@@ -1529,7 +1546,163 @@ stub_noname_complaint (void)
   complaint (&symfile_complaints, _("stub type has NULL name"));
 }
 
-/* Find the real type of TYPE.  This function returns the real type,
+/* Calculates the size of a type.  If TYPE has static bound values takes upper
+   and lower bound into account, otherwise only the TYPE length is returned.
+   TYPE is expected not to be a typedef.  */
+
+static ULONGEST
+get_type_length (const struct type *type)
+{
+  const struct type *range_type, *target_type;
+  ULONGEST len = TYPE_LENGTH (type);
+  LONGEST low_bound, high_bound;
+
+  gdb_assert (TYPE_CODE (type) != TYPE_CODE_TYPEDEF);
+
+  if (TYPE_CODE (type) != TYPE_CODE_ARRAY
+      && TYPE_CODE (type) != TYPE_CODE_STRING)
+    return len;
+
+  range_type = check_typedef (TYPE_INDEX_TYPE (type));
+
+  if (!has_static_range (TYPE_RANGE_DATA (range_type)))
+    return len;
+
+  target_type = check_typedef (TYPE_TARGET_TYPE (type));
+
+  /* Now recompute the length of the array type, based on its
+     number of elements and the target type's length.
+     Watch out for Ada null Ada arrays where the high bound
+     is smaller than the low bound.  */
+  low_bound = TYPE_LOW_BOUND (range_type);
+  high_bound = TYPE_HIGH_BOUND (range_type);
+
+  if (high_bound < low_bound)
+    len = 0;
+  else
+    {
+      /* For now, we conservatively take the array length to be 0
+         if its length exceeds UINT_MAX.  The code below assumes
+         that for x < 0, (ULONGEST) x == -x + ULONGEST_MAX + 1,
+         which is technically not guaranteed by C, but is usually true
+         (because it would be true if x were unsigned with its
+         high-order bit on).  It uses the fact that
+         high_bound-low_bound is always representable in
+         ULONGEST and that if high_bound-low_bound+1 overflows,
+         it overflows to 0.  We must change these tests if we
+         decide to increase the representation of TYPE_LENGTH
+         from unsigned int to ULONGEST.  */
+      ULONGEST ulow = low_bound, uhigh = high_bound;
+      ULONGEST tlen = get_type_length (target_type);
+
+      len = tlen * (uhigh - ulow + 1);
+      if (tlen == 0 || (len / tlen - 1 + ulow) != uhigh || len > UINT_MAX)
+        len = 0;
+    }
+
+  return len;
+}
+
+/* See gdbtypes.h.  */
+
+int
+is_dynamic_type (const struct type *type)
+{
+  if (TYPE_CODE (type) == TYPE_CODE_ARRAY
+      && TYPE_NFIELDS (type) == 1)
+    {
+      const struct type *range_type = TYPE_INDEX_TYPE (type);
+
+      if (!has_static_range (TYPE_RANGE_DATA (range_type)))
+	return 1;
+    }
+
+  if (TYPE_CODE (type) == TYPE_CODE_PTR
+      || TYPE_CODE (type) == TYPE_CODE_REF
+      || TYPE_CODE (type) == TYPE_CODE_TYPEDEF)
+    return is_dynamic_type (TYPE_TARGET_TYPE (type));
+
+  return 0;
+}
+
+/* Resolves dynamic bound values of an array type to static ones.
+   TYPE is modified in place and is expected not to be a typedef.
+   ADDRESS might be needed to resolve the subrange bounds, it is the location
+   of the associated array.  */
+
+static void
+resolve_dynamic_bounds (struct type *type, CORE_ADDR address)
+{
+  struct type *real_type;
+  const struct dynamic_prop *prop;
+  CORE_ADDR value;
+
+  gdb_assert (TYPE_CODE (type) != TYPE_CODE_TYPEDEF);
+
+  if (TYPE_CODE (type) == TYPE_CODE_PTR
+      || TYPE_CODE (type) == TYPE_CODE_REF)
+    resolve_dynamic_bounds (check_typedef (TYPE_TARGET_TYPE (type)), address);
+  else
+    {
+      if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
+	{
+	  struct type *ary_dim = type;
+
+	  do {
+	    struct type *range_type = check_typedef (TYPE_INDEX_TYPE (ary_dim));
+
+	    prop = &TYPE_RANGE_DATA (range_type)->low;
+	    if (dwarf2_evaluate_property (prop, address, &value))
+	      {
+		TYPE_LOW_BOUND (range_type) = value;
+		TYPE_LOW_BOUND_KIND (range_type) = PROP_CONST;
+	      }
+
+	    prop = &TYPE_RANGE_DATA (range_type)->high;
+	    if (dwarf2_evaluate_property (prop, address, &value))
+	      {
+		TYPE_HIGH_BOUND (range_type) = value;
+		TYPE_HIGH_BOUND_KIND (range_type) = PROP_CONST;
+	      }
+
+	    ary_dim = check_typedef (TYPE_TARGET_TYPE (ary_dim));
+	  } while (ary_dim != NULL && TYPE_CODE (ary_dim) == TYPE_CODE_ARRAY);
+	}
+    }
+}
+
+/* See gdbtypes.h  */
+
+struct type *
+resolve_dynamic_type (struct type *type, CORE_ADDR addr)
+{
+  struct type *real_type = check_typedef (type);
+  struct type *resolved_type;
+  struct cleanup *cleanup;
+  htab_t copied_types;
+
+  if (!TYPE_OBJFILE_OWNED (real_type))
+    return type;
+
+  if (!is_dynamic_type (real_type))
+    return type;
+
+  /* Make a deep copy of the type.  */
+  copied_types = create_copied_types_hash (TYPE_OBJFILE (type));
+  cleanup = make_cleanup_htab_delete (copied_types);
+  resolved_type = copy_type_recursive
+    (TYPE_OBJFILE (type), type, copied_types);
+  do_cleanups (cleanup);
+
+  real_type = check_typedef (resolved_type);
+  resolve_dynamic_bounds (real_type, addr);
+
+  resolved_type->length = get_type_length (real_type);
+
+  return resolved_type;
+}
+
+/* find the real type of TYPE.  This function returns the real type,
    after removing all layers of typedefs, and completing opaque or stub
    types.  Completion changes the TYPE argument, but stripping of
    typedefs does not.
@@ -1705,44 +1878,15 @@ check_typedef (struct type *type)
 	  /* Nothing we can do.  */
 	}
       else if (TYPE_CODE (type) == TYPE_CODE_ARRAY
-	       && TYPE_NFIELDS (type) == 1
-	       && (TYPE_CODE (range_type = TYPE_INDEX_TYPE (type))
-		   == TYPE_CODE_RANGE))
-	{
-	  /* Now recompute the length of the array type, based on its
-	     number of elements and the target type's length.
-	     Watch out for Ada null Ada arrays where the high bound
-	     is smaller than the low bound.  */
-	  const LONGEST low_bound = TYPE_LOW_BOUND (range_type);
-	  const LONGEST high_bound = TYPE_HIGH_BOUND (range_type);
-	  ULONGEST len;
-
-	  if (high_bound < low_bound)
-	    len = 0;
-	  else
-	    {
-	      /* For now, we conservatively take the array length to be 0
-		 if its length exceeds UINT_MAX.  The code below assumes
-		 that for x < 0, (ULONGEST) x == -x + ULONGEST_MAX + 1,
-		 which is technically not guaranteed by C, but is usually true
-		 (because it would be true if x were unsigned with its
-		 high-order bit on).  It uses the fact that
-		 high_bound-low_bound is always representable in
-		 ULONGEST and that if high_bound-low_bound+1 overflows,
-		 it overflows to 0.  We must change these tests if we 
-		 decide to increase the representation of TYPE_LENGTH
-		 from unsigned int to ULONGEST.  */
-	      ULONGEST ulow = low_bound, uhigh = high_bound;
-	      ULONGEST tlen = TYPE_LENGTH (target_type);
-
-	      len = tlen * (uhigh - ulow + 1);
-	      if (tlen == 0 || (len / tlen - 1 + ulow) != uhigh 
-		  || len > UINT_MAX)
-		len = 0;
-	    }
-	  TYPE_LENGTH (type) = len;
-	  TYPE_TARGET_STUB (type) = 0;
-	}
+	       || TYPE_CODE (type) == TYPE_CODE_STRING)
+        {
+          range_type = TYPE_INDEX_TYPE (type);
+          if (has_static_range (TYPE_RANGE_DATA (range_type)))
+            {
+              TYPE_LENGTH (type) = get_type_length (type);
+              TYPE_TARGET_STUB (type) = 0;
+            }
+        }
       else if (TYPE_CODE (type) == TYPE_CODE_RANGE)
 	{
 	  TYPE_LENGTH (type) = TYPE_LENGTH (target_type);
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index 4fa9ef5..3309ff7 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -1,3 +1,4 @@
+
 /* Internal type definitions for GDB.
 
    Copyright (C) 1992-2013 Free Software Foundation, Inc.
@@ -1570,6 +1571,15 @@ extern struct type *lookup_unsigned_typename (const struct language_defn *,
 extern struct type *lookup_signed_typename (const struct language_defn *,
 					    struct gdbarch *, const char *);
 
+/* Resolves all dynamic values of a type e.g. array bounds to static values.
+   ADDR specifies the location of the variable the type is bound to.
+   If TYPE has no dynamic values returns TYPE otherwise a new type with static
+   values is returned.  */
+extern struct type *resolve_dynamic_type (struct type *type, CORE_ADDR addr);
+
+/* Predicates if the type has dynamic values, which are not resolved yet.  */
+extern int is_dynamic_type (const struct type *type);
+
 extern struct type *check_typedef (struct type *);
 
 #define CHECK_TYPEDEF(TYPE)			\
diff --git a/gdb/value.c b/gdb/value.c
index 8c263ea..57b7696 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -3182,9 +3182,11 @@ value_from_ulongest (struct type *type, ULONGEST num)
 struct value *
 value_from_pointer (struct type *type, CORE_ADDR addr)
 {
-  struct value *val = allocate_value (type);
+  struct type *resolved_type = resolve_dynamic_type (type, addr);
+  struct value *val = allocate_value (resolved_type);
 
-  store_typed_address (value_contents_raw (val), check_typedef (type), addr);
+  store_typed_address (value_contents_raw (val),
+		       check_typedef (resolved_type), addr);
   return val;
 }
 
@@ -3198,12 +3200,13 @@ value_from_contents_and_address (struct type *type,
 				 const gdb_byte *valaddr,
 				 CORE_ADDR address)
 {
+  struct type *resolved_type = resolve_dynamic_type (type, address);
   struct value *v;
 
   if (valaddr == NULL)
-    v = allocate_value_lazy (type);
+    v = allocate_value_lazy (resolved_type);
   else
-    v = value_from_contents (type, valaddr);
+    v = value_from_contents (resolved_type, valaddr);
   set_value_address (v, address);
   VALUE_LVAL (v) = lval_memory;
   return v;
-- 
1.8.3.1

[PATCH v3 01/13] vla: introduce new bound type abstraction adapt uses

[Sanimir Agovic]

The rational behind this patch is to get started to implement the feature
described in dwarf4 standard (2.19) Static and Dynamic Values of Attributes.
It adds new BOUND_PROP to store either a constant, exprloc, or reference to
describe an upper-/lower bound of a subrange. Other than that no new features
are introduce.

2013-10-18  Sanimir Agovic  <sanimir.agovic@intel.com>
            Keven Boell  <keven.boell@intel.com>

	* dwarf2read.c (read_subrange_type): Use struct bound_prop for
	declaring high/low bounds and change uses accordingly. Call
	create_range_type_1 instead of create_range_type.
	* gdbtypes.c (create_range_type_1): New function.
	(create_range_type): Convert bounds into struct bound_prop and pass
	them to create_range_type_1.
	* gdbtypes.h (struct bound_prop): New struct.
	(create_range_type_1): New function prototype.
	(struct range_bounds): Use struct bound_prop instead of LONGEST for
	high/low bounds. Remove low_undefined/high_undefined and adapt all uses.
	(TYPE_LOW_BOUND,TYPE_HIGH_BOUND): Adapt macros to refer to the static
	part of the bound.
	* parse.c (follow_types): Set high bound kind to BOUND_UNDEFINED.

Change-Id: I06fbeb877255a541a770c897e4b53d65f21dbbef
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/dwarf2read.c | 43 +++++++++++++++++++++++++------------------
 gdb/gdbtypes.c   | 51 +++++++++++++++++++++++++++++++++++++--------------
 gdb/gdbtypes.h   | 53 +++++++++++++++++++++++++++++++++++++++--------------
 gdb/parse.c      |  3 ++-
 4 files changed, 103 insertions(+), 47 deletions(-)

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 1c7dfc5..6bdd45a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -14260,7 +14260,7 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
   struct type *base_type, *orig_base_type;
   struct type *range_type;
   struct attribute *attr;
-  LONGEST low, high;
+  struct dynamic_prop low, high;
   int low_default_is_valid;
   const char *name;
   LONGEST negative_mask;
@@ -14277,33 +14277,37 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
   if (range_type)
     return range_type;
 
+  low.kind = PROP_CONST;
+  high.kind = PROP_CONST;
+  high.data.const_val = 0;
+
   /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
      omitting DW_AT_lower_bound.  */
   switch (cu->language)
     {
     case language_c:
     case language_cplus:
-      low = 0;
+      low.data.const_val = 0;
       low_default_is_valid = 1;
       break;
     case language_fortran:
-      low = 1;
+      low.data.const_val = 1;
       low_default_is_valid = 1;
       break;
     case language_d:
     case language_java:
     case language_objc:
-      low = 0;
+      low.data.const_val = 0;
       low_default_is_valid = (cu->header.version >= 4);
       break;
     case language_ada:
     case language_m2:
     case language_pascal:
-      low = 1;
+      low.data.const_val = 1;
       low_default_is_valid = (cu->header.version >= 4);
       break;
     default:
-      low = 0;
+      low.data.const_val = 0;
       low_default_is_valid = 0;
       break;
     }
@@ -14313,7 +14317,8 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
      but we don't know how to handle it.  */
   attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
   if (attr)
-    low = dwarf2_get_attr_constant_value (attr, low);
+    low.data.const_val
+      = dwarf2_get_attr_constant_value (attr, low.data.const_val);
   else if (!low_default_is_valid)
     complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
 				      "- DIE at 0x%x [in module %s]"),
@@ -14335,10 +14340,10 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
              either; we just represent them as zero-length
              arrays.  Choose an appropriate upper bound given
              the lower bound we've computed above.  */
-          high = low - 1;
+          high.data.const_val = low.data.const_val - 1;
         }
       else
-        high = dwarf2_get_attr_constant_value (attr, 1);
+        high.data.const_val = dwarf2_get_attr_constant_value (attr, 1);
     }
   else
     {
@@ -14346,12 +14351,12 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
       if (attr)
 	{
 	  int count = dwarf2_get_attr_constant_value (attr, 1);
-	  high = low + count - 1;
+	  high.data.const_val = low.data.const_val + count - 1;
 	}
       else
 	{
 	  /* Unspecified array length.  */
-	  high = low - 1;
+	  high.data.const_val = low.data.const_val - 1;
 	}
     }
 
@@ -14395,22 +14400,24 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
 
   negative_mask =
     (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
-  if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
-    low |= negative_mask;
-  if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
-    high |= negative_mask;
+  if (low.kind == PROP_CONST
+      && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
+    low.data.const_val |= negative_mask;
+  if (high.kind == PROP_CONST
+      && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
+    high.data.const_val |= negative_mask;
 
-  range_type = create_range_type (NULL, orig_base_type, low, high);
+  range_type = create_range_type_1 (NULL, orig_base_type, &low, &high);
 
   /* Mark arrays with dynamic length at least as an array of unspecified
      length.  GDB could check the boundary but before it gets implemented at
      least allow accessing the array elements.  */
   if (attr && attr_form_is_block (attr))
-    TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
+    TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
 
   /* Ada expects an empty array on no boundary attributes.  */
   if (attr == NULL && cu->language != language_ada)
-    TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
+    TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
 
   name = dwarf2_name (die, cu);
   if (name)
diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index e18a0d2..276ebe3 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -796,19 +796,13 @@ allocate_stub_method (struct type *type)
   return mtype;
 }
 
-/* Create a range type using either a blank type supplied in
-   RESULT_TYPE, or creating a new type, inheriting the objfile from
-   INDEX_TYPE.
-
-   Indices will be of type INDEX_TYPE, and will range from LOW_BOUND
-   to HIGH_BOUND, inclusive.
-
-   FIXME: Maybe we should check the TYPE_CODE of RESULT_TYPE to make
-   sure it is TYPE_CODE_UNDEF before we bash it into a range type?  */
+/* Create a range type with a dynamic range from LOW_BOUND to
+   HIGH_BOUND, inclusive.  See create_range_type for further details. */
 
 struct type *
-create_range_type (struct type *result_type, struct type *index_type,
-		   LONGEST low_bound, LONGEST high_bound)
+create_range_type_1 (struct type *result_type, struct type *index_type,
+		     const struct dynamic_prop *low_bound,
+		     const struct dynamic_prop *high_bound)
 {
   if (result_type == NULL)
     result_type = alloc_type_copy (index_type);
@@ -818,17 +812,46 @@ create_range_type (struct type *result_type, struct type *index_type,
     TYPE_TARGET_STUB (result_type) = 1;
   else
     TYPE_LENGTH (result_type) = TYPE_LENGTH (check_typedef (index_type));
+
   TYPE_RANGE_DATA (result_type) = (struct range_bounds *)
     TYPE_ZALLOC (result_type, sizeof (struct range_bounds));
-  TYPE_LOW_BOUND (result_type) = low_bound;
-  TYPE_HIGH_BOUND (result_type) = high_bound;
+  TYPE_RANGE_DATA (result_type)->low = *low_bound;
+  TYPE_RANGE_DATA (result_type)->high = *high_bound;
 
-  if (low_bound >= 0)
+  if (low_bound->kind == PROP_CONST && low_bound->data.const_val >= 0)
     TYPE_UNSIGNED (result_type) = 1;
 
   return result_type;
 }
 
+/* Create a range type using either a blank type supplied in
+   RESULT_TYPE, or creating a new type, inheriting the objfile from
+   INDEX_TYPE.
+
+   Indices will be of type INDEX_TYPE, and will range from LOW_BOUND
+   to HIGH_BOUND, inclusive.
+
+   FIXME: Maybe we should check the TYPE_CODE of RESULT_TYPE to make
+   sure it is TYPE_CODE_UNDEF before we bash it into a range type?  */
+
+struct type *
+create_range_type (struct type *result_type, struct type *index_type,
+		   LONGEST low_bound, LONGEST high_bound)
+{
+  struct dynamic_prop low, high;
+
+  low.kind = PROP_CONST;
+  low.data.const_val = low_bound;
+
+  high.kind = PROP_CONST;
+  high.data.const_val = high_bound;
+
+  result_type = create_range_type_1 (result_type, index_type,
+				     &low, &high);
+
+  return result_type;
+}
+
 /* Set *LOWP and *HIGHP to the lower and upper bounds of discrete type
    TYPE.  Return 1 if type is a range type, 0 if it is discrete (and
    bounds will fit in LONGEST), or -1 otherwise.  */
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index d7fdedf..4fa9ef5 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -365,6 +365,28 @@ enum type_instance_flag_value
 #define TYPE_ADDRESS_CLASS_ALL(t) (TYPE_INSTANCE_FLAGS(t) \
 				   & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
 
+/* Used to store a dynamic property.  */
+
+struct dynamic_prop
+{
+  /* Determine which field of the union dynamic_prop.data is used.  */
+  enum
+  {
+    PROP_UNDEFINED,
+    PROP_CONST,
+    PROP_LOCEXPR,
+    PROP_LOCLIST
+  } kind;
+
+  /* Storage for dynamic or static value.  */
+  union data
+  {
+    LONGEST const_val;
+    void *baton;
+  } data;
+};
+
+
 /* Determine which field of the union main_type.fields[x].loc is used.  */
 
 enum field_loc_kind
@@ -589,19 +611,11 @@ struct main_type
     {
       /* Low bound of range.  */
 
-      LONGEST low;
+      struct dynamic_prop low;
 
       /* High bound of range.  */
 
-      LONGEST high;
-
-      /* Flags indicating whether the values of low and high are
-         valid.  When true, the respective range value is
-         undefined.  Currently used only for FORTRAN arrays.  */
-           
-      char low_undefined;
-      char high_undefined;
-
+      struct dynamic_prop high;
     } *bounds;
 
   } flds_bnds;
@@ -1066,12 +1080,18 @@ extern void allocate_gnat_aux_type (struct type *);
 
 #define TYPE_INDEX_TYPE(type) TYPE_FIELD_TYPE (type, 0)
 #define TYPE_RANGE_DATA(thistype) TYPE_MAIN_TYPE(thistype)->flds_bnds.bounds
-#define TYPE_LOW_BOUND(range_type) TYPE_RANGE_DATA(range_type)->low
-#define TYPE_HIGH_BOUND(range_type) TYPE_RANGE_DATA(range_type)->high
+#define TYPE_LOW_BOUND(range_type) \
+  TYPE_RANGE_DATA(range_type)->low.data.const_val
+#define TYPE_HIGH_BOUND(range_type) \
+  TYPE_RANGE_DATA(range_type)->high.data.const_val
 #define TYPE_LOW_BOUND_UNDEFINED(range_type) \
-   TYPE_RANGE_DATA(range_type)->low_undefined
+  (TYPE_RANGE_DATA(range_type)->low.kind == PROP_UNDEFINED)
 #define TYPE_HIGH_BOUND_UNDEFINED(range_type) \
-   TYPE_RANGE_DATA(range_type)->high_undefined
+  (TYPE_RANGE_DATA(range_type)->high.kind == PROP_UNDEFINED)
+#define TYPE_HIGH_BOUND_KIND(range_type) \
+  TYPE_RANGE_DATA(range_type)->high.kind
+#define TYPE_LOW_BOUND_KIND(range_type) \
+  TYPE_RANGE_DATA(range_type)->low.kind
 
 /* Moto-specific stuff for FORTRAN arrays.  */
 
@@ -1526,6 +1546,11 @@ extern struct type *lookup_function_type_with_arguments (struct type *,
 							 int,
 							 struct type **);
 
+extern struct type *create_range_type_1 (struct type *, struct type *,
+					 const struct dynamic_prop *,
+					 const struct dynamic_prop *);
+
+
 extern struct type *create_range_type (struct type *, struct type *, LONGEST,
 				       LONGEST);
 
diff --git a/gdb/parse.c b/gdb/parse.c
index 4b9ca5d..b1671f3 100644
--- a/gdb/parse.c
+++ b/gdb/parse.c
@@ -1710,7 +1710,8 @@ follow_types (struct type *follow_type)
 	  lookup_array_range_type (follow_type,
 				   0, array_size >= 0 ? array_size - 1 : 0);
 	if (array_size < 0)
-	  TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (follow_type) = 1;
+	  TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type))
+	    = PROP_UNDEFINED;
 	break;
       case tp_function:
 	/* FIXME-type-allocation: need a way to free this type when we are
-- 
1.8.3.1

[PATCH v3 00/13] C99 variable length array support

[Sanimir Agovic]

Hello,

this patch series (v3) add C99 variable length support to gdb.

It allows the user to evaluate a vla like an ordinary static array e.g. print
its elements instead of printing the pointer to the array. In addition the size
of a vla can be retrieved with gdbs builtin sizeof operator.


    1| void foo (size_t n) {
    2|   int ary[n];
    3|   memset(ary, 0, sizeof(ary));
    4| }

    (gdb) print ary
    $1 = {0 <repeats 42 times>}

    (gdb) print sizeof ary
    $2 = 168

Some technical background
=========================

Dwarf allows certain attributes e.g upper/lower bound to be computed
dynamically. To support this feature with the current gdb type-system types
are "normalized". This means types with dynamic properties are converted
to types with static properties.

To convert a type with dynamic properties into one with static properties
access to inferior memory is needed. Therefore we hooked into the following
value constructors value_at/value_at_lazy/value_from_contents_and_address
as they require an inferior address in addition to a type to instantiate
a value. IIF the passed type has dynamic properties we resolve the bounds
and thus the type is modified, not in place but rather by a new copy.

Given the following code snippet:

  struct value *val = value_at (my_vla_type, at_address);

Before this was always true:
  TYPE_LENGTH (value_type (val)) == TYPE_LENGTH (my_vla_type)

This is not the case after applying this patch series. Type normalization
is done in the mentioned value constructors and might change the value type.

Some documentation, examples as well as a github branch with support for c99
and Fortran variable length arrays is availabel at http://intel-gdb.github.io/

Changes in v3
=============
 - Add line breaks to long test expressions.
 - Add side effect check for sizeof/ptype/whatis to vla-datatypes.exp.
 - Add test file for subranges with present DW_AT_count attribute.
 - Add introduction comments to all new functions.
 - Add patch which deals with value contents with constant byte-sequence.
   It will be squashed once the series is approved.
 - Deal with location lists in case we reference a die in DW_AT_location.
   This fixes the crash Pedro was mentioning in:
   https://sourceware.org/ml/gdb-patches/2013-11/msg00646.html
 - Renamed struct dwarf2_bound to dynamic_prop and remove all references
   to dwarf2 entities in gdbtypes.[c,h] introduced by this patch series.
 - Addressed various coding style issues.
 - Fixed typo in commit log.

Changes in v2
=============
 - Removed patch 05/10: allow side effects for sizeof argument
 - New patch: support for DW_AT_count
 - Replaced undefined_low, high with DWARF_UNDEFINED
 - Add varobj testcase to mi test
 - Fixed commit log
 - Various small issues mentioned in patches 01/10 and 02/10

 -Sanimir & Keven

Sanimir Agovic (13):
  vla: introduce new bound type abstraction adapt uses
  type: add c99 variable length array support
  vla: enable sizeof operator to work with variable length arrays
  vla: enable sizeof operator for indirection
  vla: update type from newly created value
  vla: print "variable length" for unresolved dynamic bounds
  vla: support for DW_AT_count
  vla: resolve dynamic bounds if value contents is a constant
    byte-sequence
  test: cover subranges with present DW_AT_count attribute
  test: multi-dimensional c99 vla.
  test: evaluate pointers to C99 vla correctly.
  test: basic c99 vla tests for C primitives
  test: add mi vla test

 gdb/ada-lang.c                           |  13 +-
 gdb/c-typeprint.c                        |   6 +-
 gdb/cp-valprint.c                        |   2 +
 gdb/d-valprint.c                         |   1 +
 gdb/dwarf2loc.c                          | 105 +++++++++++
 gdb/dwarf2loc.h                          |  26 +++
 gdb/dwarf2read.c                         | 211 +++++++++++++++++-----
 gdb/eval.c                               |  10 +-
 gdb/findvar.c                            |   3 +
 gdb/gdbtypes.c                           | 299 ++++++++++++++++++++++++-------
 gdb/gdbtypes.h                           |  63 +++++--
 gdb/jv-valprint.c                        |   1 +
 gdb/parse.c                              |   3 +-
 gdb/testsuite/gdb.base/vla-datatypes.c   |  86 +++++++++
 gdb/testsuite/gdb.base/vla-datatypes.exp | 138 ++++++++++++++
 gdb/testsuite/gdb.base/vla-multi.c       |  55 ++++++
 gdb/testsuite/gdb.base/vla-multi.exp     |  48 +++++
 gdb/testsuite/gdb.base/vla-ptr.c         |  63 +++++++
 gdb/testsuite/gdb.base/vla-ptr.exp       |  52 ++++++
 gdb/testsuite/gdb.dwarf2/count.exp       | 106 +++++++++++
 gdb/testsuite/gdb.mi/mi-vla-c99.exp      |  82 +++++++++
 gdb/testsuite/gdb.mi/vla.c               |  35 ++++
 gdb/valops.c                             |   3 +
 gdb/value.c                              |  12 +-
 24 files changed, 1287 insertions(+), 136 deletions(-)
 create mode 100644 gdb/testsuite/gdb.base/vla-datatypes.c
 create mode 100644 gdb/testsuite/gdb.base/vla-datatypes.exp
 create mode 100644 gdb/testsuite/gdb.base/vla-multi.c
 create mode 100644 gdb/testsuite/gdb.base/vla-multi.exp
 create mode 100644 gdb/testsuite/gdb.base/vla-ptr.c
 create mode 100644 gdb/testsuite/gdb.base/vla-ptr.exp
 create mode 100644 gdb/testsuite/gdb.dwarf2/count.exp
 create mode 100644 gdb/testsuite/gdb.mi/mi-vla-c99.exp
 create mode 100644 gdb/testsuite/gdb.mi/vla.c

-- 
1.8.3.1

[PATCH v3 06/13] vla: print "dynamic length" for unresolved dynamic bounds

[Sanimir Agovic]

1| void foo (size_t n) {
2|   int vla[n];
3| }

Given the following expression

  (gdb) ptype &vla

Gdb evaluates the expression with EVAL_AVOID_SIDE_EFFECTS and thus
does not resolve the bounds information and misinterprets the high
bound as a constant. The current output is:

  type = int (*)[1289346]

this patch deals with this case and prints:

  type = int (*)[variable length]

instead.

2013-08-30  Keven Boell  <keven.boell@intel.com>
            Sanimir Agovic  <sanimir.agovic@intel.com>

	* c-typeprint.c (c_type_print_varspec_suffix): Added
	check for not yet resolved high bound. If unresolved, print
	"variable length" string to the console instead of random
	length.

Change-Id: Ic6a5fc08c8651ef18760bdacacc492ed44fe4af4
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/c-typeprint.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gdb/c-typeprint.c b/gdb/c-typeprint.c
index 2757337..4acb2b0 100644
--- a/gdb/c-typeprint.c
+++ b/gdb/c-typeprint.c
@@ -689,7 +689,10 @@ c_type_print_varspec_suffix (struct type *type,
 
 	fprintf_filtered (stream, (is_vector ?
 				   " __attribute__ ((vector_size(" : "["));
-	if (get_array_bounds (type, &low_bound, &high_bound))
+	/* Bounds are not yet resolved, print a bounds placeholder instead.  */
+	if (TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type)) == PROP_LOCEXPR)
+	  fprintf_filtered (stream, "variable length");
+	else if (get_array_bounds (type, &low_bound, &high_bound))
 	  fprintf_filtered (stream, "%s", 
 			    plongest (high_bound - low_bound + 1));
 	fprintf_filtered (stream, (is_vector ? ")))" : "]"));
-- 
1.8.3.1

[PATCH v3 04/13] vla: enable sizeof operator for indirection

[Sanimir Agovic]

This patch enables the sizeof operator for indirections:

1| void foo (size_t n) {
2|   int vla[n];
3|   int *vla_ptr = &vla;
4| }

(gdb) p sizeof(*vla_ptr)

yields N.

2013-10-18  Sanimir Agovic  <sanimir.agovic@intel.com>
            Keven Boell  <keven.boell@intel.com>

	* eval.c (evaluate_subexp_for_sizeof): Create a indirect value and
	retrieve the dynamic type size.

Change-Id: I3dbe85ebbc87ca93115a1952316b6436f750a16d
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/eval.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gdb/eval.c b/gdb/eval.c
index a81e789..b3e45ca 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -3027,6 +3027,8 @@ evaluate_subexp_for_sizeof (struct expression *exp, int *pos)
 	  && TYPE_CODE (type) != TYPE_CODE_ARRAY)
 	error (_("Attempt to take contents of a non-pointer value."));
       type = check_typedef (TYPE_TARGET_TYPE (type));
+      if (is_dynamic_type (type))
+	type = value_type (value_ind (val));
       return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
 
     case UNOP_MEMVAL:
-- 
1.8.3.1

[PATCH v3 07/13] vla: support for DW_AT_count

[Sanimir Agovic]

This patch adds support for DW_AT_count as requested in the code review:

  https://sourceware.org/ml/gdb-patches/2013-11/msg00200.html

2013-11-19  Sanimir Agovic  <sanimir.agovic@intel.com>
            Keven Boell <keven.boell@intel.com>

	* dwarf2read.c (read_subrange_type): If DW_AT_count is dynamic
	create the following upper bound dwarf expression 'low + count + 1'
	by hand.

Change-Id: I0f70edd22f2f6d8d7aa32f245e45617a7dc1b24a
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/dwarf2read.c | 46 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 7 deletions(-)

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 0df385a..10f4e23 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -14431,17 +14431,49 @@ read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
   attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
   if (!attr_to_dynamic_prop (attr, die, cu, &high))
     {
+      struct dynamic_prop count;
+
       attr = dwarf2_attr (die, DW_AT_count, cu);
-      if (attr)
+      if (attr_to_dynamic_prop (attr, die, cu, &count))
 	{
-	  int count = dwarf2_get_attr_constant_value (attr, 1);
-	  high.data.const_val = low.data.const_val + count - 1;
+	  if (count.kind == PROP_LOCEXPR)
+	    {
+	      enum bfd_endian byte_order;
+	      struct dwarf2_property_baton *baton = count.data.baton;
+	      const struct dwarf_block blk = {baton->locexpr.size,
+					      baton->locexpr.data};
+	      /* Allocate a static buffer to hold the following expression:
+		 DW_OP_const8u(1) + CORE_ADDR(8) + DW_OP_plus(1)
+		 + DW_OP_const1s(1), char(1) + DW_OP_minus(1) == 13 bytes.  */
+	      gdb_byte ops[13];
+
+	      ops[0] = DW_OP_const8u;
+	      byte_order = gdbarch_byte_order (get_objfile_arch (cu->objfile));
+	      store_unsigned_integer (ops + 1, 8, byte_order,
+				      low.data.const_val);
+
+	      ops[9] = DW_OP_plus;
+	      ops[10] = DW_OP_const1u;
+	      ops[11] = 1;
+	      ops[12] = DW_OP_minus;
+
+	      baton
+		= obstack_alloc (&cu->objfile->objfile_obstack,
+				 sizeof (struct dwarf2_property_baton));
+	      /* This should yield the following expression:
+		 high = low + count - 1.
+	         Whereas low is a dwarf expression itself.  */
+	      baton->locexpr = block_to_locexpr_baton (&blk, cu, ops,
+						       sizeof (ops));
+	      high.data.baton = baton;
+	      high.kind = PROP_LOCEXPR;
+	    }
+	  else if (count.kind == PROP_CONST)
+	    high.data.const_val = low.data.const_val + count.data.const_val - 1;
 	}
       else
-	{
-	  /* Unspecified array length.  */
-	  high.data.const_val = low.data.const_val - 1;
-	}
+	/* Unspecified array length.  */
+	high.data.const_val = low.data.const_val - 1;
     }
 
   /* Dwarf-2 specifications explicitly allows to create subrange types
-- 
1.8.3.1

[PATCH v3 12/13] test: basic c99 vla tests for C primitives

[Sanimir Agovic]

2013-10-18  Keven Boell  <keven.boell@intel.com>
            Sanimir Agovic  <sanimir.agovic@intel.com>

gdb/testsuite:
	* gdb.base/vla-datatypes.c: New. Test source file
	for VLA datatype checks.
	* gdb.base/vla-datatypes.exp: New. Tests ensure that
	a VLA in C can be evaluated correctly with standard
	C types.

Change-Id: I7e9ac796ac7e9afa983d60e6d4b506017e4afe54
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/testsuite/gdb.base/vla-datatypes.c   |  86 +++++++++++++++++++
 gdb/testsuite/gdb.base/vla-datatypes.exp | 138 +++++++++++++++++++++++++++++++
 2 files changed, 224 insertions(+)
 create mode 100644 gdb/testsuite/gdb.base/vla-datatypes.c
 create mode 100644 gdb/testsuite/gdb.base/vla-datatypes.exp

diff --git a/gdb/testsuite/gdb.base/vla-datatypes.c b/gdb/testsuite/gdb.base/vla-datatypes.c
new file mode 100644
index 0000000..267d239
--- /dev/null
+++ b/gdb/testsuite/gdb.base/vla-datatypes.c
@@ -0,0 +1,86 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <stddef.h>
+#define SIZE 5
+
+struct foo
+{
+  int a;
+};
+
+typedef struct bar
+{
+  int x;
+  struct foo y;
+} BAR;
+
+void
+vla_factory (int n)
+{
+  int             int_vla[n];
+  unsigned int    unsigned_int_vla[n];
+  double          double_vla[n];
+  float           float_vla[n];
+  long            long_vla[n];
+  unsigned long   unsigned_long_vla[n];
+  char            char_vla[n];
+  short           short_vla[n];
+  unsigned short  unsigned_short_vla[n];
+  unsigned char   unsigned_char_vla[n];
+  struct foo      foo_vla[n];
+  BAR             bar_vla[n];
+  int i;
+
+  for (i = 0; i < n; i++)
+    {
+      int_vla[i] = i*2;
+      unsigned_int_vla[i] = i*2;
+      double_vla[i] = i/2.0;
+      float_vla[i] = i/2.0f;
+      long_vla[i] = i*2;
+      unsigned_long_vla[i] = i*2;
+      char_vla[i] = 'A';
+      short_vla[i] = i*2;
+      unsigned_short_vla[i] = i*2;
+      unsigned_char_vla[i] = 'A';
+      foo_vla[i].a = i*2;
+      bar_vla[i].x = i*2;
+      bar_vla[i].y.a = i*2;
+    }
+
+  size_t int_size        = sizeof(int_vla);     /* vlas_filled */
+  size_t uint_size       = sizeof(unsigned_int_vla);
+  size_t double_size     = sizeof(double_vla);
+  size_t float_size      = sizeof(float_vla);
+  size_t long_size       = sizeof(long_vla);
+  size_t char_size       = sizeof(char_vla);
+  size_t short_size      = sizeof(short_vla);
+  size_t ushort_size     = sizeof(unsigned_short_vla);
+  size_t uchar_size      = sizeof(unsigned_char_vla);
+  size_t foo_size        = sizeof(foo_vla);
+  size_t bar_size        = sizeof(bar_vla);
+
+  return;                                 /* break_end_of_vla_factory */
+}
+
+int
+main ()
+{
+  vla_factory(SIZE);
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/vla-datatypes.exp b/gdb/testsuite/gdb.base/vla-datatypes.exp
new file mode 100644
index 0000000..c251709
--- /dev/null
+++ b/gdb/testsuite/gdb.base/vla-datatypes.exp
@@ -0,0 +1,138 @@
+# Copyright 2013 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+standard_testfile ".c"
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+gdb_breakpoint [gdb_get_line_number "vlas_filled"]
+gdb_continue_to_breakpoint "vlas_filled"
+
+# Check the values of VLA's.
+gdb_test "print int_vla" "\\$\\d+ = \\\{0, 2, 4, 6, 8\\\}" \
+         "print int_vla"
+gdb_test "print unsigned_int_vla" "\\$\\d+ = \\\{0, 2, 4, 6, 8\\\}" \
+         "print unsigned_int_vla"
+gdb_test "print double_vla" "\\$\\d+ = \\\{0, 0.5, 1, 1.5, 2\\\}" \
+         "print double_vla"
+gdb_test "print float_vla" "\\$\\d+ = \\\{0, 0.5, 1, 1.5, 2\\\}" \
+         "print float_vla"
+gdb_test "print long_vla" "\\$\\d+ = \\\{0, 2, 4, 6, 8\\\}" \
+         "print long_vla"
+gdb_test "print unsigned_long_vla" "\\$\\d+ = \\\{0, 2, 4, 6, 8\\\}" \
+         "print unsigned_long_vla"
+gdb_test "print char_vla" "\\$\\d+ = \"AAAAA\"" \
+         "print char_vla"
+gdb_test "print short_vla" "\\$\\d+ = \\\{0, 2, 4, 6, 8\\\}" \
+         "print short_vla"
+gdb_test "print unsigned_short_vla" "\\$\\d+ = \\\{0, 2, 4, 6, 8\\\}" \
+         "print unsigned_short_vla"
+gdb_test "print unsigned_char_vla" "\\$\\d+ = \"AAAAA\"" \
+         "print unsigned_char_vla"
+gdb_test "print foo_vla" \
+         "\\\{\\\{a = 0\\\}, \\\{a = 2\\\}, \\\{a = 4\\\}, \\\{a = 6\\\}, \\\{a = 8\\\}\\\}" \
+         "print foo_vla"
+gdb_test "print bar_vla" \
+         "\\\{\\\{x = 0, y = \\\{a = 0\\\}\\\}, \\\{x = 2, y = \\\{a = 2\\\}\\\}, \\\{x = 4, y = \\\{a = 4\\\}\\\}, \\\{x = 6, y = \\\{a = 6\\\}\\\}, \\\{x = 8, y = \\\{a = 8\\\}\\\}\\\}" \
+         "print bar_vla"
+
+# Check whatis of VLA's.
+gdb_test "whatis int_vla" "type = int \\\[5\\\]" "whatis int_vla"
+gdb_test "whatis unsigned_int_vla" "type = unsigned int \\\[5\\\]" \
+         "whatis unsigned_int_vla"
+gdb_test "whatis double_vla" "type = double \\\[5\\\]" "whatis double_vla"
+gdb_test "whatis float_vla" "type = float \\\[5\\\]" "whatis float_vla"
+gdb_test "whatis long_vla" "type = long( int)? \\\[5\\\]" "whatis long_vla"
+gdb_test "whatis unsigned_long_vla" \
+         "type = (long unsigned int|unsigned long) \\\[5\\\]" \
+         "whatis unsigned_long_vla"
+gdb_test "whatis char_vla" "type = char \\\[5\\\]" "whatis char_vla"
+gdb_test "whatis short_vla" "type = short( int)? \\\[5\\\]" \
+         "whatis short_vla"
+gdb_test "whatis unsigned_short_vla" \
+         "type = (short unsigned int|unsigned short) \\\[5\\\]" \
+         "whatis unsigned_short_vla"
+gdb_test "whatis unsigned_char_vla" "type = unsigned char \\\[5\\\]" \
+         "whatis unsigned_char_vla"
+gdb_test "whatis foo_vla" "type = struct foo \\\[5\\\]" "whatis foo_vla"
+gdb_test "whatis bar_vla" "type = BAR \\\[5\\\]" "whatis bar_vla"
+
+# Check ptype of VLA's.
+gdb_test "ptype int_vla" "type = int \\\[5\\\]" "ptype int_vla"
+gdb_test "ptype unsigned_int_vla" "type = unsigned int \\\[5\\\]" \
+         "ptype unsigned_int_vla"
+gdb_test "ptype double_vla" "type = double \\\[5\\\]" "ptype double_vla"
+gdb_test "ptype float_vla" "type = float \\\[5\\\]" "ptype float_vla"
+gdb_test "ptype long_vla" "type = long( int)? \\\[5\\\]" "ptype long_vla"
+gdb_test "ptype unsigned_long_vla" "type = unsigned long \\\[5\\\]" \
+         "ptype unsigned_long_vla"
+gdb_test "ptype char_vla" "type = char \\\[5\\\]" "ptype char_vla"
+gdb_test "ptype short_vla" "type = short( int)? \\\[5\\\]" \
+         "ptype short_vla"
+gdb_test "ptype unsigned_short_vla" "type = unsigned short \\\[5\\\]" \
+         "ptype unsigned_short_vla"
+gdb_test "ptype unsigned_char_vla" "type = unsigned char \\\[5\\\]" \
+         "ptype unsigned_char_vla"
+gdb_test "ptype foo_vla" "type = struct foo {\r\n\\s+int a;\r\n} \\\[5\\\]" \
+         "ptype foo_vla"
+gdb_test "ptype bar_vla" \
+         "type = struct bar {\r\n\\s+int x;\r\n\\s+struct foo y;\r\n} \\\[5\\\]" \
+         "ptype bar_vla"
+
+# Check the size of the VLA's.
+gdb_breakpoint [gdb_get_line_number "break_end_of_vla_factory"]
+gdb_continue_to_breakpoint "break_end_of_vla_factory"
+gdb_test "print int_size == sizeof(int_vla)" "\\$\\d+ = 1" "size of int_vla"
+gdb_test "print uint_size == sizeof(unsigned_int_vla)" "\\$\\d+ = 1" \
+         "size of unsigned_int_vla"
+gdb_test "print double_size == sizeof(double_vla)" "\\$\\d+ = 1" \
+         "size of double_vla"
+gdb_test "print float_size == sizeof(float_vla)" "\\$\\d+ = 1" \
+         "size of float_vla"
+gdb_test "print long_size == sizeof(long_vla)" "\\$\\d+ = 1" \
+         "size of long_vla"
+gdb_test "print char_size == sizeof(char_vla)" "\\$\\d+ = 1" \
+         "size of char_vla"
+gdb_test "print short_size == sizeof(short_vla)" "\\$\\d+ = 1" \
+         "size of short_vla"
+gdb_test "print ushort_size == sizeof(unsigned_short_vla)" "\\$\\d+ = 1" \
+         "size of unsigned_short_vla"
+gdb_test "print uchar_size == sizeof(unsigned_char_vla)" "\\$\\d+ = 1" \
+         "size of unsigned_char_vla"
+gdb_test "print foo_size == sizeof(foo_vla)" "\\$\\d+ = 1" "size of foo_vla"
+gdb_test "print bar_size == sizeof(bar_vla)" "\\$\\d+ = 1" "size of bar_vla"
+
+# Check side effects for sizeof argument.
+set sizeof_int [get_sizeof "int" 4]
+gdb_test_no_output  "set variable int_vla\[0\] = 42" \
+                    "set variable int_vla\[0\] = 42"
+
+gdb_test "print sizeof (++int_vla\[0\])" "\\$\\d+ = ${sizeof_int}" \
+         "print sizeof (++int_vla\[0\])"
+gdb_test "print int_vla\[0\]" "\\$\\d+ = 42" \
+         "print int_vla\[0\] - sizeof no side effects"
+
+gdb_test "ptype ++int_vla\[0\]" "type = int" "ptype ++int_vla\[0\]"
+gdb_test "print int_vla\[0\]" "\\$\\d+ = 42" \
+         "print int_vla\[0\] - ptype no side effects"
+
+gdb_test "whatis ++int_vla\[0\]" "type = int" "whatis ++int_vla\[0\]"
+gdb_test "print int_vla\[0\]" "\\$\\d+ = 42" \
+         "print int_vla\[0\] - whatis no side effects"
-- 
1.8.3.1

[PATCH v3 03/13] vla: enable sizeof operator to work with variable length arrays

[Sanimir Agovic]

In C99 the sizeof operator computes the size of a variable length array
at runtime (6.5.3.4 The sizeof operator). This patch reflects the semantic
change in the debugger.

We now are able to get the size of a vla:

1| void foo (size_t n) {
2|   int vla[n];
3| }

(gdb) p sizeof(vla)

yields N * sizeof(int).

2013-10-18  Sanimir Agovic  <sanimir.agovic@intel.com>
            Keven Boell  <keven.boell@intel.com>

	* eval.c (evaluate_subexp_for_sizeof): If the type passed to sizeof is
	dynamic  evaluate the argument to compute the length.

Change-Id: I79656d4ec5bd5d728748a1059ac414a5440eb659
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/eval.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gdb/eval.c b/gdb/eval.c
index 9d81a92..a81e789 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -3041,8 +3041,14 @@ evaluate_subexp_for_sizeof (struct expression *exp, int *pos)
       return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
 
     case OP_VAR_VALUE:
-      (*pos) += 4;
       type = check_typedef (SYMBOL_TYPE (exp->elts[pc + 2].symbol));
+      if (is_dynamic_type (type))
+	{
+	  val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_NORMAL);
+	  type = value_type (val);
+	}
+      else
+	(*pos) += 4;
       return
 	value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
 
-- 
1.8.3.1

[PATCH v3 08/13] vla: resolve dynamic bounds if value contents is a constant byte-sequence

[Sanimir Agovic]

A variable location might be a constant value and therefore no inferior memory
access is needed to read the content. In this case try to resolve the type
bounds.

2013-11-26  Sanimir Agovic  <sanimir.agovic@intel.com>
            Keven Boell  <keven.boell@intel.com>

	* findvar.c (default_read_var_value): Resolve dynamic bounds if location
	points to a constant blob.

Change-Id: I73c31b64976b7d2c603c68d4584909502c8c5928
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/findvar.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gdb/findvar.c b/gdb/findvar.c
index ec6afd6..a543dc4 100644
--- a/gdb/findvar.c
+++ b/gdb/findvar.c
@@ -468,6 +468,9 @@ default_read_var_value (struct symbol *var, struct frame_info *frame)
       return v;
 
     case LOC_CONST_BYTES:
+      if (is_dynamic_type (type))
+	/* Value is a constant byte-sequence and needs no memory access.  */
+	type = resolve_dynamic_type (type, /* Unused address.  */ 0);
       v = allocate_value (type);
       memcpy (value_contents_raw (v), SYMBOL_VALUE_BYTES (var),
 	      TYPE_LENGTH (type));
-- 
1.8.3.1

[PATCH v3 09/13] test: cover subranges with present DW_AT_count attribute

[Sanimir Agovic]

The dwarf attribute DW_AT_count specifies the elements of a subrange.
This test covers subranges with present count but absent upper bound
attribute, both with static and dynamic attribute values.

2013-11-26  Sanimir Agovic  <sanimir.agovic@intel.com>
            Keven Boell  <keven.boell@intel.com>

testsuite:
	* gdb.dwarf2/count.exp: New test.

Change-Id: I0a537c23bc7d5e0bffe58d14d0125dc7cd753f48
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/testsuite/gdb.dwarf2/count.exp | 106 +++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 gdb/testsuite/gdb.dwarf2/count.exp

diff --git a/gdb/testsuite/gdb.dwarf2/count.exp b/gdb/testsuite/gdb.dwarf2/count.exp
new file mode 100644
index 0000000..80744b1
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/count.exp
@@ -0,0 +1,106 @@
+# Copyright 2013 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Tests to cover DW_AT_count attribute in subranges.
+
+load_lib dwarf.exp
+
+# Only run on targets which support dwarf and gas.
+if { ![dwarf2_support] } {
+    return 0
+}
+
+standard_testfile main.c count.S
+
+set asm_file [standard_output_file $srcfile2]
+Dwarf::assemble $asm_file {
+    cu {} {
+	compile_unit {{language @DW_LANG_C99}} {
+	    declare_labels char_label array_label static_array_label
+	    declare_labels var_label
+
+	    char_label: base_type {
+		{name char}
+		{encoding @DW_ATE_signed}
+		{byte_size 1 DW_FORM_sdata}
+	    }
+
+	    array_label: array_type {
+		{type :$char_label}
+	    } {
+		subrange_type {
+		    {count {DW_OP_lit5} SPECIAL_expr}
+		    {type :$char_label}
+		}
+	    }
+
+	    static_array_label: array_type {
+		{type :$char_label}
+	    } {
+		subrange_type {
+		    {count 5 DW_FORM_sdata}
+		    {type :$char_label}
+		}
+	    }
+
+	    DW_TAG_variable {
+		{name array}
+		{type :$array_label}
+		{const_value hello DW_FORM_block1}
+	    }
+
+	    DW_TAG_variable {
+		{name static_array}
+		{type :$static_array_label}
+		{const_value world DW_FORM_block1}
+	    }
+	}
+    }
+}
+
+if { [gdb_compile ${srcdir}/${subdir}/${srcfile} ${binfile}1.o \
+	  object {nodebug}] != "" } {
+    return -1
+}
+
+if { [gdb_compile $asm_file ${binfile}2.o object {nodebug}] != "" } {
+    return -1
+}
+
+if { [gdb_compile [list ${binfile}1.o ${binfile}2.o] \
+	  "${binfile}" executable {}] != "" } {
+    return -1
+}
+
+global GDBFLAGS
+set saved_gdbflags $GDBFLAGS
+set GDBFLAGS [concat $GDBFLAGS " -readnow"]
+clean_restart ${testfile}
+set GDBFLAGS $saved_gdbflags
+
+if ![runto_main] {
+    perror "couldn't run to main"
+    return -1
+}
+
+gdb_test "ptype array" "type = char \\\[5\\\]" "ptype array"
+gdb_test "whatis array" "type = char \\\[5\\\]" "whatis array"
+gdb_test "print array" "\"hello\"" "print array"
+gdb_test "print sizeof array" "5" "print sizeof array"
+
+gdb_test "ptype static_array" "type = char \\\[5\\\]" "ptype static_array"
+gdb_test "whatis static_array" "type = char \\\[5\\\]" "whatis static_array"
+gdb_test "print static_array" "\"world\"" "print static_array"
+gdb_test "print sizeof static_array" "5" "print sizeof static_array"
-- 
1.8.3.1

[PATCH v3 10/13] test: multi-dimensional c99 vla.

[Sanimir Agovic]

2013-10-18  Keven Boell  <keven.boell@intel.com>
            Sanimir Agovic  <sanimir.agovic@intel.com>

gdb/testsuite:
	* gdb.base/vla-multi.c: New. Test source file
	for testing multi-dimensional VLA's in C.
	* gdb.base/vla-multi.exp: New. Tests ensure
	that multi-dimensional VLA's can be evaluated
	correctly in C.

Change-Id: If9cf7517301e0558aced1358723e1b62f6df0c97
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/testsuite/gdb.base/vla-multi.c   | 55 ++++++++++++++++++++++++++++++++++++
 gdb/testsuite/gdb.base/vla-multi.exp | 48 +++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 gdb/testsuite/gdb.base/vla-multi.c
 create mode 100644 gdb/testsuite/gdb.base/vla-multi.exp

diff --git a/gdb/testsuite/gdb.base/vla-multi.c b/gdb/testsuite/gdb.base/vla-multi.c
new file mode 100644
index 0000000..47c753e
--- /dev/null
+++ b/gdb/testsuite/gdb.base/vla-multi.c
@@ -0,0 +1,55 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+void
+f1 (int n, int m, int vla_ptr[n][m])
+{
+  return;                                 /* f1_breakpoint */
+}
+
+void
+f2 (int m, int vla_ptr[][m])
+{
+  return;                                 /* f2_breakpoint */
+}
+
+void
+vla_mult (int n, int m)
+{
+  int vla[n][m];
+  int i, j;
+
+  for (i = 0; i < n; i++)
+    {
+      for (j = 0; j < m; j++)
+        {
+          vla[i][j] = i + j;
+        }
+    }
+
+  f1(n, m, vla);                          /* vla_filled */
+  f2(m, vla);
+
+  return;
+}
+
+int
+main()
+{
+  vla_mult(2, 2);
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/vla-multi.exp b/gdb/testsuite/gdb.base/vla-multi.exp
new file mode 100644
index 0000000..53f626f
--- /dev/null
+++ b/gdb/testsuite/gdb.base/vla-multi.exp
@@ -0,0 +1,48 @@
+# Copyright 2013 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+standard_testfile ".c"
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+set sizeof_int [get_sizeof "int" 4]
+
+gdb_breakpoint [gdb_get_line_number "vla_filled"]
+gdb_continue_to_breakpoint "vla_filled"
+gdb_test "print vla" "\\$\\d+ = \\\{\\\{0, 1\\\}, \\\{1, 2\\\}\\\}" \
+         "print vla"
+gdb_test "print vla\[0\]\[1\]" "\\$\\d+ = 1" "print vla\[0\]\[1\]"
+
+gdb_breakpoint [gdb_get_line_number "f1_breakpoint"]
+gdb_continue_to_breakpoint "f1_breakpoint"
+gdb_test "print *vla_ptr" "\\$\\d+ = \\\{0, 1\\\}" "print *vla_ptr (f1)"
+
+# Calculate the overall size of the vla.
+set sizeof_vla [ expr "2" * "$sizeof_int" ]
+gdb_test "print sizeof vla_ptr\[0\]" "\\$\\d+ = ${sizeof_vla}" \
+         "print sizeof vla_ptr\[0\]"
+gdb_test "ptype &vla_ptr" \
+    "type = int \\\(\\\*\\\*\\\)\\\[variable length\\\]" \
+    "ptype &vla_ptr"
+
+gdb_breakpoint [gdb_get_line_number "f2_breakpoint"]
+gdb_continue_to_breakpoint "f2_breakpoint"
+gdb_test "print *vla_ptr" "\\$\\d+ = \\\{0, 1\\\}" "print *vla_ptr (f2)"
-- 
1.8.3.1

[PATCH v3 06/13] vla: print "variable length" for unresolved dynamic bounds

[Sanimir Agovic]

1| void foo (size_t n) {
2|   int vla[n];
3| }

Given the following expression

  (gdb) ptype &vla

Gdb evaluates the expression with EVAL_AVOID_SIDE_EFFECTS and thus
does not resolve the bounds information and misinterprets the high
bound as a constant. The current output is:

  type = int (*)[1289346]

this patch deals with this case and prints:

  type = int (*)[variable length]

instead.

2013-08-30  Keven Boell  <keven.boell@intel.com>
            Sanimir Agovic  <sanimir.agovic@intel.com>

	* c-typeprint.c (c_type_print_varspec_suffix): Added
	check for not yet resolved high bound. If unresolved, print
	"variable length" string to the console instead of random
	length.

Change-Id: Ic6a5fc08c8651ef18760bdacacc492ed44fe4af4
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/c-typeprint.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gdb/c-typeprint.c b/gdb/c-typeprint.c
index 2757337..739d770 100644
--- a/gdb/c-typeprint.c
+++ b/gdb/c-typeprint.c
@@ -689,7 +689,11 @@ c_type_print_varspec_suffix (struct type *type,
 
 	fprintf_filtered (stream, (is_vector ?
 				   " __attribute__ ((vector_size(" : "["));
-	if (get_array_bounds (type, &low_bound, &high_bound))
+	/* Bounds are not yet resolved, print a bounds placeholder instead.  */
+	if (TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type)) == PROP_LOCEXPR
+	    || TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (type)) == PROP_LOCLIST)
+	  fprintf_filtered (stream, "variable length");
+	else if (get_array_bounds (type, &low_bound, &high_bound))
 	  fprintf_filtered (stream, "%s", 
 			    plongest (high_bound - low_bound + 1));
 	fprintf_filtered (stream, (is_vector ? ")))" : "]"));
-- 
1.8.3.1

[PATCH v3 11/13] test: evaluate pointers to C99 vla correctly.

[Sanimir Agovic]

2013-10-18  Keven Boell  <keven.boell@intel.com>

gdb/testsuite:
	* gdb.base/vla-ptr.c: New. Test source file
	for testing pointers to VLA's in C.
	* gdb.base/vla-ptr.exp: New. Tests ensure that
	the evaluation of pointers to VLA's work
	correctly in C.

Change-Id: Iea007544b3e95f9da4ca746d142e7be0350cf87b
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/testsuite/gdb.base/vla-ptr.c   | 63 ++++++++++++++++++++++++++++++++++++++
 gdb/testsuite/gdb.base/vla-ptr.exp | 52 +++++++++++++++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 gdb/testsuite/gdb.base/vla-ptr.c
 create mode 100644 gdb/testsuite/gdb.base/vla-ptr.exp

diff --git a/gdb/testsuite/gdb.base/vla-ptr.c b/gdb/testsuite/gdb.base/vla-ptr.c
new file mode 100644
index 0000000..85c41e0
--- /dev/null
+++ b/gdb/testsuite/gdb.base/vla-ptr.c
@@ -0,0 +1,63 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#define SIZE 5
+
+void
+foo (int n, int vla_ptr[n])
+{
+  return;         /* foo_bp */
+}
+
+void
+bar (int *vla_ptr)
+{
+  return;         /* bar_bp */
+}
+
+void
+vla_func (int n)
+{
+  int vla[n];
+  int (*vla_ptr)[n];
+  typedef int typedef_vla[n];
+  typedef_vla td_vla;
+  int i;
+
+  for (i = 0; i < n; i++)
+    {
+      vla[i] = 2+i;
+      td_vla[i] = 4+i;
+    }
+
+  foo(n, vla);
+  bar(vla);
+
+  vla_ptr = &vla;
+
+  typedef_vla *td_ptr = &td_vla;  /* vla_ptr_assigned */
+
+  return;         /* typedef_ptr_assigned */
+}
+
+int
+main ()
+{
+  vla_func(SIZE);
+
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.base/vla-ptr.exp b/gdb/testsuite/gdb.base/vla-ptr.exp
new file mode 100644
index 0000000..a7785b0
--- /dev/null
+++ b/gdb/testsuite/gdb.base/vla-ptr.exp
@@ -0,0 +1,52 @@
+# Copyright 2013 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+standard_testfile ".c"
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+set sizeof_int [get_sizeof "int" 4]
+
+# Check that VLA passed to function (pointer) points to the first element.
+gdb_breakpoint [gdb_get_line_number "foo_bp"]
+gdb_continue_to_breakpoint "foo_bp"
+gdb_test "print vla_ptr" "\\\(int \\\*\\\) $hex" "print vla_ptr (foo)"
+gdb_test "print *vla_ptr" "\\$\\d+ = 2" "print *vla_ptr (foo)"
+
+gdb_breakpoint [gdb_get_line_number "bar_bp"]
+gdb_continue_to_breakpoint "bar_bp"
+gdb_test "print vla_ptr" "\\\(int \\\*\\\) $hex" "print vla_ptr (bar)"
+gdb_test "print *vla_ptr" "\\$\\d+ = 2" "print *vla_ptr (bar)"
+
+gdb_breakpoint [gdb_get_line_number "vla_ptr_assigned"]
+gdb_continue_to_breakpoint "vla_ptr_assigned"
+gdb_test "print *vla_ptr" "\\$\\d+ = \\\{2, 3, 4, 5, 6\\\}" \
+         "print *vla_ptr (vla_func)"
+
+# Calculate the overall size of the vla.
+set sizeof_vla [ expr "5" * "$sizeof_int" ]
+gdb_test "print sizeof(*vla_ptr)" "\\$\\d+ = ${sizeof_vla}" \
+         "print sizeof(*vla_ptr) (vla_func)"
+
+gdb_breakpoint [gdb_get_line_number "typedef_ptr_assigned"]
+gdb_continue_to_breakpoint "typedef_ptr_assigned"
+gdb_test "print td_vla" "\\$\\d+ = \\\{4, 5, 6, 7, 8\\\}" "print td_vla"
+gdb_test "print *td_ptr" "\\$\\d+ = \\\{4, 5, 6, 7, 8\\\}" "print *td_ptr"
-- 
1.8.3.1

[PATCH v3 13/13] test: add mi vla test

[Sanimir Agovic]

2013-10-18  Keven Boell  <keven.boell@intel.com>
            Sanimir Agovic  <sanimir.agovic@intel.com>

testsuite/gdb.mi/

	* mi-vla-c99.exp: New file.
	* vla.c: New file.

Change-Id: If86f3a770c9c1d6b415057a40f51ba2a6f20ba0e
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/testsuite/gdb.mi/mi-vla-c99.exp | 82 +++++++++++++++++++++++++++++++++++++
 gdb/testsuite/gdb.mi/vla.c          | 35 ++++++++++++++++
 2 files changed, 117 insertions(+)
 create mode 100644 gdb/testsuite/gdb.mi/mi-vla-c99.exp
 create mode 100644 gdb/testsuite/gdb.mi/vla.c

diff --git a/gdb/testsuite/gdb.mi/mi-vla-c99.exp b/gdb/testsuite/gdb.mi/mi-vla-c99.exp
new file mode 100644
index 0000000..9d0c6cc
--- /dev/null
+++ b/gdb/testsuite/gdb.mi/mi-vla-c99.exp
@@ -0,0 +1,82 @@
+# Copyright 1999-2013 Free Software Foundation, Inc.
+
+# Contributed by Intel Corp. <keven.boell@intel.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Verify that, using the MI, we can evaluate a simple C Variable Length
+# Array (VLA).
+
+load_lib mi-support.exp
+set MIFLAGS "-i=mi"
+
+gdb_exit
+if [mi_gdb_start] {
+    continue
+}
+
+standard_testfile vla.c
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" \
+                  "${binfile}" executable {debug}] != "" } {
+     untested mi-vla-basics.exp
+     return -1
+}
+
+mi_delete_breakpoints
+mi_gdb_reinitialize_dir $srcdir/$subdir
+mi_gdb_load ${binfile}
+
+set bp_lineno [gdb_get_line_number "vla-filled"]
+
+mi_create_breakpoint "-t vla.c:$bp_lineno" 1 "del" "func" \
+             ".*vla.c" $bp_lineno $hex \
+             "insert breakpoint at line $bp_lineno after vla is filled"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "func" "\{name=\"n\",value=\"5\"\}" \
+               ".*vla.c" "$bp_lineno" { "" "disp=\"del\"" } \
+               "run to breakpoint at line $bp_lineno"
+
+mi_gdb_test "500-data-evaluate-expression vla" \
+    "500\\^done,value=\"\\{0, 1, 2, 3, 4\\}\"" "evaluate complete vla"
+
+mi_gdb_test "501-data-evaluate-expression vla\[0\]" \
+    "501\\^done,value=\"0\"" "evaluate vla\[0\]"
+
+mi_gdb_test "502-data-evaluate-expression vla\[2\]" \
+    "502\\^done,value=\"2\"" "evaluate vla\[2\]"
+
+mi_gdb_test "503-data-evaluate-expression vla\[4\]" \
+    "503\\^done,value=\"4\"" "evaluate vla\[4\]"
+
+mi_create_varobj_checked vla vla "int \\\[5\\\]" \
+                                 "create local variable vla"
+
+mi_gdb_test "504-var-info-type vla" \
+    "504\\^done,type=\"int \\\[5\\\]\"" \
+    "info type variable vla"
+
+mi_gdb_test "505-var-show-format vla" \
+    "505\\^done,format=\"natural\"" \
+    "show format variable vla"
+
+mi_gdb_test "506-var-evaluate-expression vla" \
+    "506\\^done,value=\"\\\[5\\\]\"" \
+    "eval variable vla"
+
+mi_list_array_varobj_children "vla" "5" "int" \
+    "get children of vla"
+
+mi_gdb_exit
+return 0
diff --git a/gdb/testsuite/gdb.mi/vla.c b/gdb/testsuite/gdb.mi/vla.c
new file mode 100644
index 0000000..9b33fc8
--- /dev/null
+++ b/gdb/testsuite/gdb.mi/vla.c
@@ -0,0 +1,35 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Contributed by Intel Corp. <keven.boell@intel.com>
+
+   Copyright 2013 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+int func (int n)
+{
+  int vla[n], i;
+
+  for (i = 0; i < n; i++)
+    vla[i] = i;
+
+  return n;                 /* vla-filled */
+}
+
+int main ()
+{
+  func (5);
+
+  return 0;
+}
-- 
1.8.3.1

[PATCH v3 05/13] vla: update type from newly created value

[Sanimir Agovic]

Constructing a value based on a type and address might change the type
of the newly constructed value. Thus re-fetch type via value_type to ensure
we have the correct type at hand.

2013-10-18  Sanimir Agovic  <sanimir.agovic@intel.com>
            Keven Boell  <keven.boell@intel.com>

	* ada-lang.c (ada_value_primitive_packed_val): Re-fetch type from value.
	(ada_template_to_fixed_record_type_1): Likewise.
	(ada_to_fixed_type_1): Likewise.
	* cp-valprint.c (cp_print_value_fields_rtti): Likewise.
	(cp_print_value): Likewise.
	* d-valprint.c (dynamic_array_type): Likewise.
	* jv-valprint.c (java_value_print): Likewise.
	* valops.c (value_ind): Likewise.
	* value.c (coerce_ref): Likewise.

Change-Id: I8a0ebcbd84d8ff8db2eb24960f099d131816cb18
Signed-off-by: Sanimir Agovic <sanimir.agovic@intel.com>
---
 gdb/ada-lang.c    | 13 +++++++++++--
 gdb/cp-valprint.c |  2 ++
 gdb/d-valprint.c  |  1 +
 gdb/jv-valprint.c |  1 +
 gdb/valops.c      |  3 +++
 gdb/value.c       |  1 +
 6 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 417232c..7e1706b 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -2300,6 +2300,7 @@ ada_value_primitive_packed_val (struct value *obj, const gdb_byte *valaddr,
   else if (VALUE_LVAL (obj) == lval_memory && value_lazy (obj))
     {
       v = value_at (type, value_address (obj));
+      type = value_type (v);
       bytes = (unsigned char *) alloca (len);
       read_memory (value_address (v) + offset, bytes, len);
     }
@@ -7657,6 +7658,7 @@ ada_template_to_fixed_record_type_1 (struct type *type,
 		 size first before creating the value.  */
 	      check_size (rtype);
 	      dval = value_from_contents_and_address (rtype, valaddr, address);
+	      rtype = value_type (dval);
 	    }
           else
             dval = dval0;
@@ -7759,7 +7761,10 @@ ada_template_to_fixed_record_type_1 (struct type *type,
       off = TYPE_FIELD_BITPOS (rtype, variant_field);
 
       if (dval0 == NULL)
-        dval = value_from_contents_and_address (rtype, valaddr, address);
+	{
+	  dval = value_from_contents_and_address (rtype, valaddr, address);
+	  rtype = value_type (dval);
+	}
       else
         dval = dval0;
 
@@ -7900,7 +7905,10 @@ to_record_with_fixed_variant_part (struct type *type, const gdb_byte *valaddr,
     return type;
 
   if (dval0 == NULL)
-    dval = value_from_contents_and_address (type, valaddr, address);
+    {
+      dval = value_from_contents_and_address (type, valaddr, address);
+      type = value_type (dval);
+    }
   else
     dval = dval0;
 
@@ -8198,6 +8206,7 @@ ada_to_fixed_type_1 (struct type *type, const gdb_byte *valaddr,
 	      value_from_contents_and_address (fixed_record_type,
 					       valaddr,
 					       address);
+            fixed_record_type = value_type (obj);
             if (real_type != NULL)
               return to_fixed_record_type
 		(real_type, NULL,
diff --git a/gdb/cp-valprint.c b/gdb/cp-valprint.c
index bcf54ff..b868d37 100644
--- a/gdb/cp-valprint.c
+++ b/gdb/cp-valprint.c
@@ -443,6 +443,7 @@ cp_print_value_fields_rtti (struct type *type,
       /* Ugh, we have to convert back to a value here.  */
       value = value_from_contents_and_address (type, valaddr + offset,
 					       address + offset);
+      type = value_type (value);
       /* We don't actually care about most of the result here -- just
 	 the type.  We already have the correct offset, due to how
 	 val_print was initially called.  */
@@ -545,6 +546,7 @@ cp_print_value (struct type *type, struct type *real_type,
 		  base_val = value_from_contents_and_address (baseclass,
 							      buf,
 							      address + boffset);
+		  baseclass = value_type (base_val);
 		  thisoffset = 0;
 		  boffset = 0;
 		  thistype = baseclass;
diff --git a/gdb/d-valprint.c b/gdb/d-valprint.c
index 6e9c28d..cca629a 100644
--- a/gdb/d-valprint.c
+++ b/gdb/d-valprint.c
@@ -59,6 +59,7 @@ dynamic_array_type (struct type *type, const gdb_byte *valaddr,
 
       true_type = lookup_array_range_type (true_type, 0, length - 1);
       ival = value_at (true_type, addr);
+      true_type = value_type (ival);
 
       d_val_print (true_type,
 		   value_contents_for_printing (ival),
diff --git a/gdb/jv-valprint.c b/gdb/jv-valprint.c
index f465ca0..808e01b 100644
--- a/gdb/jv-valprint.c
+++ b/gdb/jv-valprint.c
@@ -65,6 +65,7 @@ java_value_print (struct value *val, struct ui_file *stream,
 	  type = lookup_pointer_type (type);
 
 	  val = value_at (type, address);
+	  type = value_type (val);
 	}
     }
 
diff --git a/gdb/valops.c b/gdb/valops.c
index 4fc57ec..ec2f1f6 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -268,6 +268,7 @@ value_cast_structs (struct type *type, struct value *v2)
 	{
 	  v = value_full_object (v2, real_type, full, top, using_enc);
 	  v = value_at_lazy (real_type, value_address (v));
+	  real_type = value_type (v);
 
 	  /* We might be trying to cast to the outermost enclosing
 	     type, in which case search_struct_field won't work.  */
@@ -803,6 +804,7 @@ value_dynamic_cast (struct type *type, struct value *arg)
     return value_at_lazy (type, addr);
 
   tem = value_at (type, addr);
+  type = value_type (tem);
 
   /* The first dynamic check specified in 5.2.7.  */
   if (is_public_ancestor (arg_type, TYPE_TARGET_TYPE (resolved_type)))
@@ -1610,6 +1612,7 @@ value_ind (struct value *arg1)
 			      (value_as_address (arg1)
 			       - value_pointed_to_offset (arg1)));
 
+      enc_type = value_type (arg2);
       return readjust_indirect_value_type (arg2, enc_type, base_type, arg1);
     }
 
diff --git a/gdb/value.c b/gdb/value.c
index 57b7696..c694741 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -3360,6 +3360,7 @@ coerce_ref (struct value *arg)
   retval = value_at_lazy (enc_type,
                           unpack_pointer (value_type (arg),
                                           value_contents (arg)));
+  enc_type = value_type (retval);
   return readjust_indirect_value_type (retval, enc_type,
                                        value_type_arg_tmp, arg);
 }
-- 
1.8.3.1

Re: [PATCH v3 05/13] vla: update type from newly created value

[Doug Evans]

Sanimir Agovic <sanimir.agovic@intel.com> writes:
> Constructing a value based on a type and address might change the type
> of the newly constructed value. Thus re-fetch type via value_type to ensure
> we have the correct type at hand.
>
> 2013-10-18  Sanimir Agovic  <sanimir.agovic@intel.com>
>             Keven Boell  <keven.boell@intel.com>
>
> 	* ada-lang.c (ada_value_primitive_packed_val): Re-fetch type from value.
> 	(ada_template_to_fixed_record_type_1): Likewise.
> 	(ada_to_fixed_type_1): Likewise.
> 	* cp-valprint.c (cp_print_value_fields_rtti): Likewise.
> 	(cp_print_value): Likewise.
> 	* d-valprint.c (dynamic_array_type): Likewise.
> 	* jv-valprint.c (java_value_print): Likewise.
> 	* valops.c (value_ind): Likewise.
> 	* value.c (coerce_ref): Likewise.

Hi.  Can you add a comment to each of the functions that
require this, saying something like "You must do <this> after calling me."
value_at, value_from_contents_and_address, others?

Apologies if I missed it.  I think(!) I've read the entire v3 series.

Thanks.

RE: [PATCH v3 05/13] vla: update type from newly created value

[Agovic, Sanimir]

> -----Original Message-----
> From: Doug Evans [mailto:xdje42@gmail.com]
> Sent: Friday, December 06, 2013 08:36 AM
> To: Agovic, Sanimir
> Cc: tromey@redhat.com; palves@redhat.com; xdje42@gmail.com; gdb-patches@sourceware.org;
> Boell, Keven
> Subject: Re: [PATCH v3 05/13] vla: update type from newly created value
> 
> > 	* ada-lang.c (ada_value_primitive_packed_val): Re-fetch type from value.
> 
> Hi.  Can you add a comment to each of the functions that
> require this, saying something like "You must do <this> after calling me."
> value_at, value_from_contents_and_address, others?
> 
Thanks Doug, below is the diff being part of v4. Please let me know it is OK.

diff --git a/gdb/valops.c b/gdb/valops.c
index ec2f1f6..1bccacc 100644
--- a/gdb/valops.c
+++ b/gdb/valops.c
@@ -904,7 +904,9 @@ value_one (struct type *type)
   return val;
 }

-/* Helper function for value_at, value_at_lazy, and value_at_lazy_stack.  */
+/* Helper function for value_at, value_at_lazy, and value_at_lazy_stack.
+   The type of the created value may differ from the passed type TYPE.
+   Make sure to retrieve values new type after this call.  */

 static struct value *
 get_value_at (struct type *type, CORE_ADDR addr, int lazy)
@@ -929,7 +931,9 @@ get_value_at (struct type *type, CORE_ADDR addr, int lazy)
    value_at_lazy instead.  value_at_lazy simply records the address of
    the data and sets the lazy-evaluation-required flag.  The lazy flag
    is tested in the value_contents macro, which is used if and when
-   the contents are actually required.
+   the contents are actually required.  The type of the created value
+   may differ from the passed type TYPE.  Make sure to retrieve values
+   new type after this call.

    Note: value_at does *NOT* handle embedded offsets; perform such
    adjustments before or after calling it.  */
diff --git a/gdb/value.c b/gdb/value.c
index f1cf4dd..3f445f8 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -3193,7 +3193,8 @@ value_from_pointer (struct type *type, CORE_ADDR addr)

 /* Create a value of type TYPE whose contents come from VALADDR, if it
    is non-null, and whose memory address (in the inferior) is
-   ADDRESS.  */
+   ADDRESS.  The type of the created value may differ from the passed
+   type TYPE.  Make sure to retrieve values new type after this call.  */

 struct value *
 value_from_contents_and_address (struct type *type,
Intel GmbH
Dornacher Strasse 1
85622 Feldkirchen/Muenchen, Deutschland
Sitz der Gesellschaft: Feldkirchen bei Muenchen
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Registergericht: Muenchen HRB 47456
Ust.-IdNr./VAT Registration No.: DE129385895
Citibank Frankfurt a.M. (BLZ 502 109 00) 600119052

Re: [PATCH v3 05/13] vla: update type from newly created value

[Doug Evans]

On Mon, Dec 16, 2013 at 7:20 AM, Agovic, Sanimir
<sanimir.agovic@intel.com> wrote:
>> -----Original Message-----
>> From: Doug Evans [mailto:xdje42@gmail.com]
>> Sent: Friday, December 06, 2013 08:36 AM
>> To: Agovic, Sanimir
>> Cc: tromey@redhat.com; palves@redhat.com; xdje42@gmail.com; gdb-patches@sourceware.org;
>> Boell, Keven
>> Subject: Re: [PATCH v3 05/13] vla: update type from newly created value
>>
>> >     * ada-lang.c (ada_value_primitive_packed_val): Re-fetch type from value.
>>
>> Hi.  Can you add a comment to each of the functions that
>> require this, saying something like "You must do <this> after calling me."
>> value_at, value_from_contents_and_address, others?
>>
> Thanks Doug, below is the diff being part of v4. Please let me know it is OK.
>
> diff --git a/gdb/valops.c b/gdb/valops.c
> index ec2f1f6..1bccacc 100644
> --- a/gdb/valops.c
> +++ b/gdb/valops.c
> @@ -904,7 +904,9 @@ value_one (struct type *type)
>    return val;
>  }
>
> -/* Helper function for value_at, value_at_lazy, and value_at_lazy_stack.  */
> +/* Helper function for value_at, value_at_lazy, and value_at_lazy_stack.
> +   The type of the created value may differ from the passed type TYPE.
> +   Make sure to retrieve values new type after this call.  */
>
>  static struct value *
>  get_value_at (struct type *type, CORE_ADDR addr, int lazy)
> @@ -929,7 +931,9 @@ get_value_at (struct type *type, CORE_ADDR addr, int lazy)
>     value_at_lazy instead.  value_at_lazy simply records the address of
>     the data and sets the lazy-evaluation-required flag.  The lazy flag
>     is tested in the value_contents macro, which is used if and when
> -   the contents are actually required.
> +   the contents are actually required.  The type of the created value
> +   may differ from the passed type TYPE.  Make sure to retrieve values
> +   new type after this call.
>
>     Note: value_at does *NOT* handle embedded offsets; perform such
>     adjustments before or after calling it.  */
> diff --git a/gdb/value.c b/gdb/value.c
> index f1cf4dd..3f445f8 100644
> --- a/gdb/value.c
> +++ b/gdb/value.c
> @@ -3193,7 +3193,8 @@ value_from_pointer (struct type *type, CORE_ADDR addr)
>
>  /* Create a value of type TYPE whose contents come from VALADDR, if it
>     is non-null, and whose memory address (in the inferior) is
> -   ADDRESS.  */
> +   ADDRESS.  The type of the created value may differ from the passed
> +   type TYPE.  Make sure to retrieve values new type after this call.  */
>
>  struct value *
>  value_from_contents_and_address (struct type *type,

Thanks!  Looks ok to me.

Re: [PATCH v3 00/13] C99 variable length array support

[Joel Brobecker]

Hello,

> this patch series (v3) add C99 variable length support to gdb.
> 
> It allows the user to evaluate a vla like an ordinary static array e.g. print
> its elements instead of printing the pointer to the array. In addition
> the size of a vla can be retrieved with gdbs builtin sizeof operator.

We've started working internally at AdaCore on getting rid of some
of the "GNAT encodings", with the goal of replacing them with pure
dwarf constructs. One of the issues we've noticed is precisely
the lack of support for dynamically-sized arrays, and I think
this patch series would be a very good stepping stone towards that.

I remember I had one patch that made me a little nervous (patch #5/13,
adding type re-fecthing after some value_* calls), but I also said
that I would be OK if the patch went in as is. Apart from that,
it seems to me that most/all? comments have been addressed?
Perhaps, all we're missing is just v4 of the patch series?

Any chance we could make progress on those? If there is anything
I can do to assist, please let me know as well!

Thank you :)
-- 
Joel

Re: [PATCH v3 00/13] C99 variable length array support

[Tom Tromey]

>>>>> "Joel" == Joel Brobecker <brobecker@adacore.com> writes:

Joel> We've started working internally at AdaCore on getting rid of some
Joel> of the "GNAT encodings", with the goal of replacing them with pure
Joel> dwarf constructs.

Excellent news.

Joel> Perhaps, all we're missing is just v4 of the patch series?

v4 is here:

    https://sourceware.org/ml/gdb-patches/2013-12/msg00625.html

Looking at it, I now understand the wisdom of "signed-off-by" and other
such cookies in resubmissions :)

Tom

Re: [PATCH v3 00/13] C99 variable length array support

[Joel Brobecker]

> Joel> We've started working internally at AdaCore on getting rid of some
> Joel> of the "GNAT encodings", with the goal of replacing them with pure
> Joel> dwarf constructs.
> 
> Excellent news.

... until you realize how much work it is going to be :-).
It's turning to be an even larger effort than I thought,
which is a bit of an understatement when you know how cautious
I usually am when evaluating projects. But we're trying to make
progress in baby steps...

> v4 is here:
> 
>     https://sourceware.org/ml/gdb-patches/2013-12/msg00625.html
> 
> Looking at it, I now understand the wisdom of "signed-off-by" and other
> such cookies in resubmissions :)

Thanks. I even commented on it!

Does it look like it's close to being push-able?

-- 
Joel

Re: [PATCH v3 00/13] C99 variable length array support

[Tom Tromey]

Joel> Does it look like it's close to being push-able?

I was going to look at it again soon, maybe today.

Tom

RE: [PATCH v3 00/13] C99 variable length array support

[Agovic, Sanimir]

Thanks for your review.

> -----Original Message-----
> From: gdb-patches-owner@sourceware.org [mailto:gdb-patches-owner@sourceware.org] On Behalf
> Of Joel Brobecker
> Sent: Wednesday, January 15, 2014 12:42 PM
> To: Agovic, Sanimir
> Cc: tromey@redhat.com; palves@redhat.com; xdje42@gmail.com; gdb-patches@sourceware.org;
> Boell, Keven
> Subject: Re: [PATCH v3 00/13] C99 variable length array support
> 
> Hello,
> 
> > this patch series (v3) add C99 variable length support to gdb.
> >
> > It allows the user to evaluate a vla like an ordinary static array e.g. print
> > its elements instead of printing the pointer to the array. In addition
> > the size of a vla can be retrieved with gdbs builtin sizeof operator.
> 
> We've started working internally at AdaCore on getting rid of some
> of the "GNAT encodings", with the goal of replacing them with pure
> dwarf constructs. One of the issues we've noticed is precisely
> the lack of support for dynamically-sized arrays, and I think
> this patch series would be a very good stepping stone towards that.
> 
It would be great if gnat could benefit from c99 and the upcoming fortran vla
support. I hacked on the D and go-lang compiler and could get variable length
arrays working without additional changes to gdb, simply by changing what the
compiler emits for ranges. 

> I remember I had one patch that made me a little nervous (patch #5/13,
> adding type re-fecthing after some value_* calls), but I also said
> that I would be OK if the patch went in as is. Apart from that,
> it seems to me that most/all? comments have been addressed?
> Perhaps, all we're missing is just v4 of the patch series?
> 
If it is OK for you I`d like to keep #5 as-is. AFAIK struct value
is opaque outside of its definition so any knowledge about how it works
(e.g. how values are constructed) means we leak implementation details.

> Any chance we could make progress on those? If there is anything
> I can do to assist, please let me know as well!
> 
Sure, I`m back and willing to address the missing parts =D

 -Sanimir


Intel GmbH
Dornacher Strasse 1
85622 Feldkirchen/Muenchen, Deutschland
Sitz der Gesellschaft: Feldkirchen bei Muenchen
Geschaeftsfuehrer: Christian Lamprechter, Hannes Schwaderer, Douglas Lusk
Registergericht: Muenchen HRB 47456
Ust.-IdNr./VAT Registration No.: DE129385895
Citibank Frankfurt a.M. (BLZ 502 109 00) 600119052

Re: [PATCH v3 00/13] C99 variable length array support

[Tom Tromey]

>>>>> "Sanimir" == Agovic, Sanimir <sanimir.agovic@intel.com> writes:

Sanimir> I hacked on the D and go-lang compiler and could get variable
Sanimir> length arrays working without additional changes to gdb, simply
Sanimir> by changing what the compiler emits for ranges.

Neat.

Tom

Re: [PATCH v3 00/13] C99 variable length array support

[Joel Brobecker]

> Sanimir> I hacked on the D and go-lang compiler and could get variable
> Sanimir> length arrays working without additional changes to gdb, simply
> Sanimir> by changing what the compiler emits for ranges.
> 
> Neat.

+1!

-- 
Joel