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cp-tree.def (EMPTY_CLASS_EXPR): New tree node.

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* cp-tree.def (EMPTY_CLASS_EXPR): New tree node.
	* call.c (build_call): Use EMPTY_CLASS_EXPR instead of RTL_EXPR.
	* expr.c (cplus_expand_expr): Expand it.
	* ir.texi: Document EMPTY_CLASS_EXPR.

From-SVN: r30116
This commit is contained in:
Mark Mitchell 1999-10-21 07:10:36 +00:00 • committed by Mark Mitchell
parent e54635a2f3
commit 699ed0ce1f
4 changed files with 23 additions and 7 deletions
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7
gcc/cp/ChangeLog
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@ -1,3 +1,10 @@
1999-10-21 Mark Mitchell <mark@codesourcery.com>
* cp-tree.def (EMPTY_CLASS_EXPR): New tree node.
* call.c (build_call): Use EMPTY_CLASS_EXPR instead of RTL_EXPR.
* expr.c (cplus_expand_expr): Expand it.
* ir.texi: Document EMPTY_CLASS_EXPR.
1999-10-20 Mark Mitchell <mark@codesourcery.com>
* cp-tree.h (DECL_NAMESPACE_SCOPE_P): Don't treat template

5
gcc/cp/call.c
View file

@ -395,10 +395,7 @@ build_call (function, result_type, parms)
if (is_empty_class (TREE_TYPE (TREE_VALUE (tmp)))
&& ! TREE_ADDRESSABLE (TREE_TYPE (TREE_VALUE (tmp))))
{
tree t = make_node (RTL_EXPR);
TREE_TYPE (t) = TREE_TYPE (TREE_VALUE (tmp));
RTL_EXPR_RTL (t) = const0_rtx;
RTL_EXPR_SEQUENCE (t) = NULL_RTX;
tree t = build (EMPTY_CLASS_EXPR, TREE_TYPE (TREE_VALUE (tmp)));
TREE_VALUE (tmp) = build (COMPOUND_EXPR, TREE_TYPE (t),
TREE_VALUE (tmp), t);
}

4
gcc/cp/cp-tree.def
View file

@ -70,6 +70,10 @@ DEFTREECODE (AGGR_INIT_EXPR, "aggr_init_expr", 'e', 3)
else it is NULL_TREE. */
DEFTREECODE (THROW_EXPR, "throw_expr", 'e', 1)
/* An empty class object. The TREE_TYPE gives the class type. We use
these to avoid actually creating instances of the empty classes. */
DEFTREECODE (EMPTY_CLASS_EXPR, "empty_class_expr", 'e', 0)
/* Template definition. The following fields have the specified uses,
although there are other macros in cp-tree.h that should be used for
accessing this data.

14
gcc/cp/ir.texi
View file

@ -682,9 +682,10 @@ there is no @code{FIELD_DECL} for the ``base-class portion'' of an
object.
The @code{TYPE_VFIELD} is a compiler-generated field used to point to
virtual function tables. It does not appear on the @code{TYPE_FIELDS}
list. However, back-ends should handle the @code{TYPE_VFIELD} just like
all the entries on the @code{TYPE_FIELDS} list.
virtual function tables. It may or may not appear on the
@code{TYPE_FIELDS} list. However, back-ends should handle the
@code{TYPE_VFIELD} just like all the entries on the @code{TYPE_FIELDS}
list.
The function members are available on the @code{TYPE_METHODS} list.
Again, subsequent members are found by following the @code{TREE_CHAIN}
@ -1078,6 +1079,7 @@ the function.
@tindex DO_STMT
@findex DO_BODY
@findex DO_COND
@tindex EMPTY_CLASS_EXPR
@tindex EXPR_STMT
@findex EXPR_STMT_EXPR
@tindex FOR_STMT
@ -1286,6 +1288,12 @@ Used to represent a @code{do} loop. The body of the loop is given by
@code{DO_COND}. The condition for a @code{do}-statement is always an
expression.
@item EMPTY_CLASS_EXPR
Used to represent a temporary object of a class with no data whose
address is never taken. (All such objects are interchangeable.) The
@code{TREE_TYPE} represents the type of the object.
@item EXPR_STMT
Used to represent an expression statement. Use @code{EXPR_STMT_EXPR} to