+/* This is a specialized subset of expand_expr for use by dbxout_symbol in
+ evaluating DECL_VALUE_EXPR. In particular, we stop if we find decls that
+ havn't been expanded, or if the expression is getting so complex we won't
+ be able to represent it in stabs anyway. Returns NULL on failure. */
+
+static rtx
+dbxout_expand_expr (tree expr)
+{
+ switch (TREE_CODE (expr))
+ {
+ case VAR_DECL:
+ case PARM_DECL:
+ if (DECL_HAS_VALUE_EXPR_P (expr))
+ return dbxout_expand_expr (DECL_VALUE_EXPR (expr));
+ /* FALLTHRU */
+
+ case CONST_DECL:
+ case RESULT_DECL:
+ return DECL_RTL_IF_SET (expr);
+
+ case INTEGER_CST:
+ return expand_expr (expr, NULL_RTX, VOIDmode, EXPAND_INITIALIZER);
+
+ case COMPONENT_REF:
+ case ARRAY_REF:
+ case ARRAY_RANGE_REF:
+ case BIT_FIELD_REF:
+ {
+ enum machine_mode mode;
+ HOST_WIDE_INT bitsize, bitpos;
+ tree offset, tem;
+ int volatilep = 0, unsignedp = 0;
+ rtx x;
+
+ tem = get_inner_reference (expr, &bitsize, &bitpos, &offset,
+ &mode, &unsignedp, &volatilep, true);
+
+ x = dbxout_expand_expr (tem);
+ if (x == NULL || !MEM_P (x))
+ return NULL;
+ if (offset != NULL)
+ {
+ if (!host_integerp (offset, 0))
+ return NULL;
+ x = adjust_address_nv (x, mode, tree_low_cst (offset, 0));
+ }
+ if (bitpos != 0)
+ x = adjust_address_nv (x, mode, bitpos / BITS_PER_UNIT);
+
+ return x;
+ }
+
+ default:
+ return NULL;
+ }
+}
+