[PATCH 3/3] Restrict checking value.lval on using address

[Yao Qi <qiyaoltc at gmail dot com>]

With the previous change, value.location.address is only valid for
lval_memory.  This patch restrict some checking on value.lval on
using address.  Since we have a check on VALUE_VAL in
set_value_address, we need to set VALUE_VAL properly before
set_value_address too.

gdb:

2016-11-25  Yao Qi  <yao.qi@linaro.org>

	* ada-lang.c (ensure_lval): Call set_value_address after setting
	VALUE_LVAL.
	* elfread.c (elf_gnu_ifunc_resolve_addr): Set VALUE_LVAL to
	lval_memory.
	(elf_gnu_ifunc_resolver_return_stop): Likewise.
	* value.c (value_fn_field): Likewise.
	(value_from_contents_and_address_unresolved): Likewise.
	(value_from_contents_and_address): Likewise.
	(value_address): Check value->lval isn't
	lval_memory.
	(value_raw_address): Likewise.
	(set_value_address): Assert value->lval is lval_memory.
---
 gdb/ada-lang.c |  2 +-
 gdb/elfread.c  |  2 ++
 gdb/value.c    | 17 ++++++-----------
 3 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 0647a9b..33591af 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -4473,8 +4473,8 @@ ensure_lval (struct value *val)
       const CORE_ADDR addr =
         value_as_long (value_allocate_space_in_inferior (len));
 
-      set_value_address (val, addr);
       VALUE_LVAL (val) = lval_memory;
+      set_value_address (val, addr);
       write_memory (addr, value_contents (val), len);
     }
 
diff --git a/gdb/elfread.c b/gdb/elfread.c
index e49af6d..c6d0fdb 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -879,6 +879,7 @@ elf_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc)
     name_at_pc = NULL;
 
   function = allocate_value (func_func_type);
+  VALUE_LVAL (function) = lval_memory;
   set_value_address (function, pc);
 
   /* STT_GNU_IFUNC resolver functions usually receive the HWCAP vector as
@@ -992,6 +993,7 @@ elf_gnu_ifunc_resolver_return_stop (struct breakpoint *b)
   gdb_assert (b->loc->next == NULL);
 
   func_func = allocate_value (func_func_type);
+  VALUE_LVAL (func_func) = lval_memory;
   set_value_address (func_func, b->loc->related_address);
 
   value = allocate_value (value_type);
diff --git a/gdb/value.c b/gdb/value.c
index eff5462..9fb5fe1 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -1539,9 +1539,7 @@ value_lval_const (const struct value *value)
 CORE_ADDR
 value_address (const struct value *value)
 {
-  if (value->lval == lval_internalvar
-      || value->lval == lval_internalvar_component
-      || value->lval == lval_xcallable)
+  if (value->lval != lval_memory)
     return 0;
   if (value->parent != NULL)
     return value_address (value->parent) + value->offset;
@@ -1557,9 +1555,7 @@ value_address (const struct value *value)
 CORE_ADDR
 value_raw_address (const struct value *value)
 {
-  if (value->lval == lval_internalvar
-      || value->lval == lval_internalvar_component
-      || value->lval == lval_xcallable)
+  if (value->lval != lval_memory)
     return 0;
   return value->location.address;
 }
@@ -1567,9 +1563,7 @@ value_raw_address (const struct value *value)
 void
 set_value_address (struct value *value, CORE_ADDR addr)
 {
-  gdb_assert (value->lval != lval_internalvar
-	      && value->lval != lval_internalvar_component
-	      && value->lval != lval_xcallable);
+  gdb_assert (value->lval == lval_memory);
   value->location.address = addr;
 }
 
@@ -3268,6 +3262,7 @@ value_fn_field (struct value **arg1p, struct fn_field *f,
     }
 
   v = allocate_value (ftype);
+  VALUE_LVAL (v) = lval_memory;
   if (sym)
     {
       set_value_address (v, BLOCK_START (SYMBOL_BLOCK_VALUE (sym)));
@@ -3654,8 +3649,8 @@ value_from_contents_and_address_unresolved (struct type *type,
     v = allocate_value_lazy (type);
   else
     v = value_from_contents (type, valaddr);
-  set_value_address (v, address);
   VALUE_LVAL (v) = lval_memory;
+  set_value_address (v, address);
   return v;
 }
 
@@ -3680,8 +3675,8 @@ value_from_contents_and_address (struct type *type,
   if (TYPE_DATA_LOCATION (resolved_type_no_typedef) != NULL
       && TYPE_DATA_LOCATION_KIND (resolved_type_no_typedef) == PROP_CONST)
     address = TYPE_DATA_LOCATION_ADDR (resolved_type_no_typedef);
-  set_value_address (v, address);
   VALUE_LVAL (v) = lval_memory;
+  set_value_address (v, address);
   return v;
 }
 
-- 
1.9.1