[SCM] systemtap: system-wide probe/trace tool branch, master, updated. release-1.3-209-ga44a7cb

[jistone at sourceware dot org]

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- Log -----------------------------------------------------------------
commit a44a7cb5534b2f7db818629d3d485b67ad5f33af
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Oct 19 12:20:24 2010 -0700

    PR12121: distinguish struct/typedef homonyms
    
    For example:
      typedef struct foo foo;
      foo x;
    
    This kind of "repeated" typedef used to cause bad things for us if the
    struct definition is not in the current CU.  When resolving $x->bar, we
    start at the typedef-foo and dereference to the struct-foo.  That's just
    a declaration, so we use declaration_resolve to look for the struct
    definition.  But since we were looking by the name "foo" only, we would
    find the typedef again, getting us nowhere.
    
    The fixed code does declaration_resolve on "struct foo" in the global cache,
    so in this case we won't find anything locally, and thus we continue looking
    in other CUs.  If the definition isn't found elsewhere, we're stuck anyway.
    
    * dwflpp.cxx (dwflpp::global_alias_caching_callback): Cache type names
      with a relevant prefix: struct, union, etc.  Classes are normalized to
      be "struct" too, as that's a very blurry line.
      (dwflpp::declaration_resolve(die)): New variant to resolve a specific
      die -- used so we know what exact prefix we should look for.
    * parse.cxx (parser::parse_target_symbol): Don't strip the prefix from
      @cast types anymore, so the user can be precise about what they want.
    * tapsets.cxx (dwarf_cast_query::handle_query_module): Normalize "class"
      to "struct".  If the user provides a bare name that fails to resolve,
      then try it again with the various prefixes.
    * testsuite/systemtap.base/unresolved-struct-typedef.*: New test.

-----------------------------------------------------------------------

Summary of changes:
 dwflpp.cxx                                         |   46 ++++++++++++++-----
 dwflpp.h                                           |    5 +-
 parse.cxx                                          |    6 ---
 tapsets.cxx                                        |   30 ++++++++++++-
 .../systemtap.base/unresolved-struct-typedef.c     |   26 +++++++++++
 .../systemtap.base/unresolved-struct-typedef.exp   |   26 +++++++++++
 6 files changed, 117 insertions(+), 22 deletions(-)
 create mode 100644 testsuite/systemtap.base/unresolved-struct-typedef.c
 create mode 100644 testsuite/systemtap.base/unresolved-struct-typedef.exp


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