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[binutils-gdb] aarch64: Make "info address" resolve TLS variables


https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=bce02d8884d6baa72c537d0d7c59f924cb290799

commit bce02d8884d6baa72c537d0d7c59f924cb290799
Author: Weimin Pan <weimin.pan@oracle.com>
Date:   Thu Nov 2 18:38:36 2017 -0600

    aarch64: Make "info address" resolve TLS variables
    
    TLS variables can't be resolved on aarch64-linux-gnu
    
    Running the test case with upstream gdb shows two failures:
    
    (1) Receiving different error messages when printing TLS variable before
        program runs - because the ARM compiler does not emit dwarf attribute
        DW_AT_location for TLS, the result is expected and the baseline may
        need to be changed for aarch64.
    
    (2) Using "info address" command on C++ static TLS object resulted in
        "symbol unresolved" error - below is a snippet from the test case:
    
    class K {
     public:
      static __thread int another_thread_local;
    };
    
    __thread int K::another_thread_local;
    
    (gdb) info address K::another_thread_local
    Symbol "K::another_thread_local" is unresolved.
    
    This patch contains fix for (2).
    
    Function info_address_command() handles the "info address" command and
    calls lookup_minimal_symbol_and_objfile() to find sym's symbol entry in
    mininal symbol table if SYMBOL_COMPUTED_OPS (sym) is false. Problem is
    that function lookup_minimal_symbol_and_objfile() only looked up an
    objfile's minsym ordinary hash table, not its demangled hash table, which
    was the reason why the C++ name was not found.
    
    The fix is to call lookup_minimal_symbol(), which already looks up entries
    in both minsym's hash tables, to find names when traversing the object file
    list in lookup_minimal_symbol_and_objfile().
    
    Tested in both aarch64-linux-gnu and amd64-linux-gnu. No regressions.

Diff:
---
 gdb/ChangeLog |  6 ++++++
 gdb/minsyms.c | 17 +++--------------
 gdb/minsyms.h |  2 +-
 3 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b543904..c1945cb 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2017-11-01  Weimin Pan  <weimin.pan@oracle.com>
+
+	* minsyms.c (lookup_minimal_symbol_and_objfile): Use
+	lookup_minimal_symbol() to find symbol entry.
+	* minsyms.h (lookup_minimal_symbol_and_objfile): Update comment.
+
 2018-03-23  Keith Seitz  <keiths@redhat.com>
 
 	PR c++/22968
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index a55c071..72969b7 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1009,23 +1009,12 @@ lookup_minimal_symbol_and_objfile (const char *name)
 {
   struct bound_minimal_symbol result;
   struct objfile *objfile;
-  unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE;
 
   ALL_OBJFILES (objfile)
     {
-      struct minimal_symbol *msym;
-
-      for (msym = objfile->per_bfd->msymbol_hash[hash];
-	   msym != NULL;
-	   msym = msym->hash_next)
-	{
-	  if (strcmp (MSYMBOL_LINKAGE_NAME (msym), name) == 0)
-	    {
-	      result.minsym = msym;
-	      result.objfile = objfile;
-	      return result;
-	    }
-	}
+      result = lookup_minimal_symbol (name, NULL, objfile);
+      if (result.minsym != NULL)
+        return result;
     }
 
   memset (&result, 0, sizeof (result));
diff --git a/gdb/minsyms.h b/gdb/minsyms.h
index 78b32e8..11a2020 100644
--- a/gdb/minsyms.h
+++ b/gdb/minsyms.h
@@ -203,7 +203,7 @@ struct bound_minimal_symbol lookup_minimal_symbol (const char *,
 struct bound_minimal_symbol lookup_bound_minimal_symbol (const char *);
 
 /* Find the minimal symbol named NAME, and return both the minsym
-   struct and its objfile.  This only checks the linkage name.  */
+   struct and its objfile.  */
 
 struct bound_minimal_symbol lookup_minimal_symbol_and_objfile (const char *);


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