PR10417 Pass around attributes for supporting DW_OP_{implicit,stack}_value.

Preparation for retrieving the Dwarf_Block that holds the value of an
DW_OP_implicit_value. We need the Dwarf_Attribute that is associated with
the location expression operants. Depends on new elfutils 0.143
functionality. Recognizes, but does not yet handle the new operants
DW_OP_{implicit,stack}_value.

* loc2c.h (c_translate_location): Take an Dwarf_Attribute.
* loc2c.c (c_translate_location): Likewise and pass it on.
  (location_relative): Likewise.
  (location_from_address): Likewise.
  (translate): Likewise and capture Dwarf_Block.
* loc2c-test.c (handle_variable): Pass in Dwarf_Attribute.
* dwflpp.cxx (translate_location): Likewise.
  (literal_stmt_for_return): Pass in NULL to indicate no attribute.

1 files changed, 4 insertions, 1 deletions

diff --git a/loc2c.h b/loc2c.h
index 8bc59d29..becf2d85 100644
--- a/loc2c.h
+++ b/loc2c.h
@@ -12,7 +12,9 @@ struct location;		/* Opaque */
    as the starting location, begin from scratch if *INPUT is null.
    If DW_OP_fbreg is used, it may have a subfragment computing from
    the FB_ATTR location expression. The call_frame might need to be
-   calculated by the cfa_ops for the given pc_address.
+   calculated by the cfa_ops for the given pc_address. If known the
+   locattr provides the attribute from which the locexpr array was
+   retrieved.
 
    On errors, call FAIL, which should not return.  Any later errors will use
    FAIL and FAIL_ARG from the first c_translate_location call.
@@ -32,6 +34,7 @@ struct location *c_translate_location (struct obstack *,
 				       int indent,
 				       Dwarf_Addr bias,
 				       Dwarf_Addr pc_address,
+				       Dwarf_Attribute *attr,
 				       const Dwarf_Op *locexpr,
 				       size_t locexprlen,
 				       struct location **input,