Handle alignof and _Alignof

[deliverable/binutils-gdb.git] / gdb / eval.c

diff --git a/gdb/eval.c b/gdb/eval.c
index b2032c35f1d818a7f0105f1306802cc8b1c99e24..2fdfdf93532136052c7fa786c7f1d33d86c5a0b1 100644 (file)
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -179,14 +179,14 @@ evaluate_subexpression_type (struct expression *exp, int subexp)
    set to any referenced values.  *VALP will never be a lazy value.
    This is the value which we store in struct breakpoint.
 
-   If VAL_CHAIN is non-NULL, *VAL_CHAIN will be released from the
-   value chain.  The caller must free the values individually.  If
-   VAL_CHAIN is NULL, all generated values will be left on the value
-   chain.  */
+   If VAL_CHAIN is non-NULL, the values put into *VAL_CHAIN will be
+   released from the value chain.  If VAL_CHAIN is NULL, all generated
+   values will be left on the value chain.  */
 
 void
 fetch_subexp_value (struct expression *exp, int *pc, struct value **valp,
-                   struct value **resultp, struct value **val_chain,
+                   struct value **resultp,
+                   std::vector<value_ref_ptr> *val_chain,
                    int preserve_errors)
 {
   struct value *mark, *new_mark, *result;
@@ -195,7 +195,7 @@ fetch_subexp_value (struct expression *exp, int *pc, struct value **valp,
   if (resultp)
     *resultp = NULL;
   if (val_chain)
-    *val_chain = NULL;
+    val_chain->clear ();
 
   /* Evaluate the expression.  */
   mark = value_mark ();
@@ -253,8 +253,7 @@ fetch_subexp_value (struct expression *exp, int *pc, struct value **valp,
     {
       /* Return the chain of intermediate values.  We use this to
         decide which addresses to watch.  */
-      *val_chain = new_mark;
-      value_release_to_mark (mark);
+      *val_chain = value_release_to_mark (mark);
     }
 }
 
@@ -735,17 +734,13 @@ value *
 evaluate_var_msym_value (enum noside noside,
                         struct objfile *objfile, minimal_symbol *msymbol)
 {
-  if (noside == EVAL_AVOID_SIDE_EFFECTS)
-    {
-      type *the_type = find_minsym_type_and_address (msymbol, objfile, NULL);
-      return value_zero (the_type, not_lval);
-    }
+  CORE_ADDR address;
+  type *the_type = find_minsym_type_and_address (msymbol, objfile, &address);
+
+  if (noside == EVAL_AVOID_SIDE_EFFECTS && !TYPE_GNU_IFUNC (the_type))
+    return value_zero (the_type, not_lval);
   else
-    {
-      CORE_ADDR address;
-      type *the_type = find_minsym_type_and_address (msymbol, objfile, &address);
-      return value_at_lazy (the_type, address);
-    }
+    return value_at_lazy (the_type, address);
 }
 
 /* Helper for returning a value when handling EVAL_SKIP.  */
@@ -798,6 +793,15 @@ eval_call (expression *exp, enum noside noside,
       else if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
               || TYPE_CODE (ftype) == TYPE_CODE_METHOD)
        {
+         if (TYPE_GNU_IFUNC (ftype))
+           {
+             CORE_ADDR address = value_address (argvec[0]);
+             type *resolved_type = find_gnu_ifunc_target_type (address);
+
+             if (resolved_type != NULL)
+               ftype = resolved_type;
+           }
+
          type *return_type = TYPE_TARGET_TYPE (ftype);
 
          if (return_type == NULL)
@@ -1039,13 +1043,13 @@ evaluate_funcall (type *expect_type, expression *exp, int *pos,
        {
          if (op == OP_VAR_MSYM_VALUE)
            {
-             symbol *sym = exp->elts[*pos + 2].symbol;
-             var_func_name = SYMBOL_PRINT_NAME (sym);
+             minimal_symbol *msym = exp->elts[*pos + 2].msymbol;
+             var_func_name = MSYMBOL_PRINT_NAME (msym);
            }
          else if (op == OP_VAR_VALUE)
            {
-             minimal_symbol *msym = exp->elts[*pos + 2].msymbol;
-             var_func_name = MSYMBOL_PRINT_NAME (msym);
+             symbol *sym = exp->elts[*pos + 2].symbol;
+             var_func_name = SYMBOL_PRINT_NAME (sym);
            }
 
          argvec[0] = evaluate_subexp_with_coercion (exp, pos, noside);
@@ -2663,6 +2667,19 @@ evaluate_subexp_standard (struct type *expect_type,
        }
       return evaluate_subexp_for_sizeof (exp, pos, noside);
 
+    case UNOP_ALIGNOF:
+      {
+       struct type *type
+         = value_type (evaluate_subexp (NULL_TYPE, exp, pos,
+                                        EVAL_AVOID_SIDE_EFFECTS));
+       /* FIXME: This should be size_t.  */
+       struct type *size_type = builtin_type (exp->gdbarch)->builtin_int;
+       ULONGEST align = type_align (type);
+       if (align == 0)
+         error (_("could not determine alignment of type"));
+       return value_from_longest (size_type, align);
+      }
+
     case UNOP_CAST:
       (*pos) += 2;
       type = exp->elts[pc + 1].type;