/* This file contains the definitions and documentation for the
additional tree codes used in the GNU C++ compiler (see tree.def
for the standard codes).
- Copyright (C) 1987, 1988, 1990, 1993, 1997, 1998, 2003, 2004, 2005,
+ Copyright (C) 1987, 1988, 1990, 1993, 1997, 1998, 2003, 2004, 2005,
1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Hacked by Michael Tiemann (tiemann@cygnus.com)
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA. */
+
-
/* An OFFSET_REF is used in two situations:
1. An expression of the form `A::m' where `A' is a class and `m' is
The expression is a pointer-to-member if its address is taken,
but simply denotes a member of the object if its address is not
taken.
-
+
This form is only used during the parsing phase; once semantic
analysis has taken place they are eliminated.
operator converts to. Operand is expression to be converted. */
DEFTREECODE (TYPE_EXPR, "type_expr", tcc_expression, 1)
-/* For AGGR_INIT_EXPR, operand 0 is function which performs initialization,
- operand 1 is argument list to initialization function,
- and operand 2 is the slot which was allocated for this expression. */
-DEFTREECODE (AGGR_INIT_EXPR, "aggr_init_expr", tcc_expression, 3)
+/* AGGR_INIT_EXPRs have a variably-sized representation similar to
+ that of CALL_EXPRs. Operand 0 is an INTEGER_CST node containing the
+ operand count, operand 1 is the function which performs initialization,
+ operand 2 is the slot which was allocated for this expression, and
+ the remaining operands are the arguments to the initialization function. */
+DEFTREECODE (AGGR_INIT_EXPR, "aggr_init_expr", tcc_vl_exp, 3)
/* A throw expression. operand 0 is the expression, if there was one,
else it is NULL_TREE. */
these to avoid actually creating instances of the empty classes. */
DEFTREECODE (EMPTY_CLASS_EXPR, "empty_class_expr", tcc_expression, 0)
-/* A DECL which is really just a placeholder for an expression. Used to
- implement non-class scope anonymous unions. */
-DEFTREECODE (ALIAS_DECL, "alias_decl", tcc_declaration, 0)
-
/* A reference to a member function or member functions from a base
class. BASELINK_FUNCTIONS gives the FUNCTION_DECL,
TEMPLATE_DECL, OVERLOAD, or TEMPLATE_ID_EXPR corresponding to the
functions. BASELINK_BINFO gives the base from which the functions
come, i.e., the base to which the `this' pointer must be converted
before the functions are called. BASELINK_ACCESS_BINFO gives the
- base used to name the functions.
+ base used to name the functions.
A BASELINK is an expression; the TREE_TYPE of the BASELINK gives
the type of the expression. This type is either a FUNCTION_TYPE,
/* 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.
- DECL_ARGUMENTS template parm vector
- DECL_TEMPLATE_INFO template text &c
+ DECL_ARGUMENTS template parm vector
+ DECL_TEMPLATE_INFO template text &c
DECL_VINDEX list of instantiations already produced;
only done for functions so far
For class template:
- DECL_INITIAL associated templates (methods &c)
- DECL_TEMPLATE_RESULT null
+ DECL_INITIAL associated templates (methods &c)
+ DECL_TEMPLATE_RESULT null
For non-class templates:
TREE_TYPE type of object to be constructed
- DECL_TEMPLATE_RESULT decl for object to be created
- (e.g., FUNCTION_DECL with tmpl parms used)
+ DECL_TEMPLATE_RESULT decl for object to be created
+ (e.g., FUNCTION_DECL with tmpl parms used)
*/
DEFTREECODE (TEMPLATE_DECL, "template_decl", tcc_declaration, 0)
gives the level (from 1) of the parameter.
Here's an example:
-
+
template <class T> // Index 0, Level 1.
struct S
{
template <class U, // Index 0, Level 2.
- class V> // Index 1, Level 2.
+ class V> // Index 1, Level 2.
void f();
- };
+ };
The DESCENDANTS will be a chain of TEMPLATE_PARM_INDEXs descended
from this one. The first descendant will have the same IDX, but
struct S<int>
{
template <class U, // Index 0, Level 1, Orig Level 2
- class V> // Index 1, Level 1, Orig Level 2
+ class V> // Index 1, Level 1, Orig Level 2
void f();
};
-
+
The LEVEL is the level of the parameter when we are worrying about
the types of things; the ORIG_LEVEL is the level when we are
worrying about instantiating things. */
DEFTREECODE (TEMPLATE_PARM_INDEX, "template_parm_index", tcc_exceptional, 0)
/* Index into a template parameter list for template template parameters.
- This parameter must be a type. The TYPE_FIELDS value will be a
+ This parameter must be a type. The TYPE_FIELDS value will be a
TEMPLATE_PARM_INDEX.
- It is used without template arguments like TT in C<TT>,
+ It is used without template arguments like TT in C<TT>,
TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO is NULL_TREE
and TYPE_NAME is a TEMPLATE_DECL. */
DEFTREECODE (TEMPLATE_TEMPLATE_PARM, "template_template_parm", tcc_type, 0)
macros in tree.h. Changing the order will degrade the speed of the
compiler. TEMPLATE_TYPE_PARM, TYPENAME_TYPE, TYPEOF_TYPE,
BOUND_TEMPLATE_TEMPLATE_PARM. */
-
+
/* Index into a template parameter list. This parameter must be a type.
- The type.value field will be a TEMPLATE_PARM_INDEX. */
+ The type.values field will be a TEMPLATE_PARM_INDEX. */
DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", tcc_type, 0)
/* A type designated by `typename T::t'. TYPE_CONTEXT is `T',
expression in question. */
DEFTREECODE (TYPEOF_TYPE, "typeof_type", tcc_type, 0)
-/* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments
+/* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments
like TT<int>.
In this case, TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO contains the
template name and its bound arguments. TYPE_NAME is a TYPE_DECL. */
TYPE_NAME is an IDENTIFIER_NODE for `C', the member class template. */
DEFTREECODE (UNBOUND_CLASS_TEMPLATE, "unbound_class_template", tcc_type, 0)
-/* A using declaration. DECL_INITIAL contains the specified scope.
- This is not an alias, but is later expanded into multiple aliases.
- The decl will have a NULL_TYPE iff the scope is a dependent scope,
- otherwise it will have a void type. */
+/* A using declaration. USING_DECL_SCOPE contains the specified
+ scope. In a member using decl, unless DECL_DEPENDENT_P is true,
+ USING_DECL_DECLS contains the _DECL or OVERLOAD so named. This is
+ not an alias, but is later expanded into multiple aliases. */
DEFTREECODE (USING_DECL, "using_decl", tcc_declaration, 0)
-/* A using directive. The operand is USING_STMT_NAMESPACE. */
+/* A using directive. The operand is USING_STMT_NAMESPACE. */
DEFTREECODE (USING_STMT, "using_directive", tcc_statement, 1)
-/* An un-parsed default argument. Looks like an IDENTIFIER_NODE.
- TREE_CHAIN is used to hold instantiations of functions that had to
- be instantiated before the argument was parsed. */
+/* An un-parsed default argument. Holds a vector of input tokens and
+ a vector of places where the argument was instantiated before
+ parsing had occurred. */
DEFTREECODE (DEFAULT_ARG, "default_arg", tcc_exceptional, 0)
/* A template-id, like foo<int>. The first operand is the template.
member template, the template may be an IDENTIFIER_NODE. */
DEFTREECODE (TEMPLATE_ID_EXPR, "template_id_expr", tcc_expression, 2)
-/* A list-like node for chaining overloading candidates. TREE_TYPE is
+/* A list-like node for chaining overloading candidates. TREE_TYPE is
the original name, and the parameter is the FUNCTION_DECL. */
DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0)
"OBJECT.SCOPE::~DESTRUCTOR. The first operand is the OBJECT. The
second operand (if non-NULL) is the SCOPE. The third operand is
the TYPE node corresponding to the DESTRUCTOR. The type of the
- first operand will always be a scalar type.
+ first operand will always be a scalar type.
The type of a PSEUDO_DTOR_EXPR is always "void", even though it can
be used as if it were a zero-argument function. We handle the
function-call case specially, and giving it "void" type prevents it
- being used in expressions in ways that are not permitted. */
+ being used in expressions in ways that are not permitted. */
DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", tcc_expression, 3)
/* A whole bunch of tree codes for the initial, superficial parsing of
/* Represents an 'if' statement. The operands are IF_COND,
THEN_CLAUSE, and ELSE_CLAUSE, respectively. */
-/* ??? It is currently still necessary to distinguish between IF_STMT
+/* ??? It is currently still necessary to distinguish between IF_STMT
and COND_EXPR for the benefit of templates. */
DEFTREECODE (IF_STMT, "if_stmt", tcc_statement, 3)
DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 1)
/* Represents a 'sizeof' expression during template expansion. */
-DEFTREECODE (SIZEOF_EXPR, "sizeof_expr", tcc_unary, 1)
+DEFTREECODE (SIZEOF_EXPR, "sizeof_expr", tcc_expression, 1)
/* Represents the -> operator during template expansion. */
DEFTREECODE (ARROW_EXPR, "arrow_expr", tcc_expression, 1)
/* Represents an '__alignof__' expression during template
expansion. */
-DEFTREECODE (ALIGNOF_EXPR, "alignof_expr", tcc_unary, 1)
+DEFTREECODE (ALIGNOF_EXPR, "alignof_expr", tcc_expression, 1)
/* A STMT_EXPR represents a statement-expression during template
expansion. This is the GCC extension { ( ... ) }. The
is applied. */
DEFTREECODE (UNARY_PLUS_EXPR, "unary_plus_expr", tcc_unary, 1)
+/** C++0x extensions. */
+
+/* A static assertion. This is a C++0x extension.
+ STATIC_ASSERT_CONDITION contains the condition that is being
+ checked. STATIC_ASSERT_MESSAGE contains the message (a string
+ literal) to be displayed if the condition fails to hold. */
+DEFTREECODE (STATIC_ASSERT, "static_assert", tcc_exceptional, 0)
+
+/* Represents an argument pack of types (or templates). An argument
+ pack stores zero or more arguments that will be used to instantiate
+ a parameter pack.
+
+ ARGUMENT_PACK_ARGS retrieves the arguments stored in the argument
+ pack.
+
+ Example:
+ template<typename... Values>
+ class tuple { ... };
+
+ tuple<int, float, double> t;
+
+ Values is a (template) parameter pack. When tuple<int, float,
+ double> is instantiated, the Values parameter pack is instantiated
+ with the argument pack <int, float, double>. ARGUMENT_PACK_ARGS will
+ be a TREE_VEC containing int, float, and double. */
+DEFTREECODE (TYPE_ARGUMENT_PACK, "type_argument_pack", tcc_type, 0)
+
+/* Represents an argument pack of values, which can be used either for
+ non-type template arguments or function call arguments.
+
+ NONTYPE_ARGUMENT_PACK plays precisely the same role as
+ TYPE_ARGUMENT_PACK, but will be used for packing non-type template
+ arguments (e.g., "int... Dimensions") or function arguments ("const
+ Args&... args"). */
+DEFTREECODE (NONTYPE_ARGUMENT_PACK, "nontype_argument_pack", tcc_expression, 1)
+
+/* Represents a type expression that will be expanded into a list of
+ types when instantiated with one or more argument packs.
+
+ PACK_EXPANSION_PATTERN retrieves the expansion pattern. This is
+ the type or expression that we will substitute into with each
+ argument in an argument pack.
+
+ SET_PACK_EXPANSION_PATTERN sets the expansion pattern.
+
+ PACK_EXPANSION_PARAMETER_PACKS contains a TREE_LIST of the parameter
+ packs that are used in this pack expansion.
+
+ Example:
+ template<typename... Values>
+ struct tied : tuple<Values&...> {
+ // ...
+ };
+
+ The derivation from tuple contains a TYPE_PACK_EXPANSION for the
+ template arguments. Its EXPR_PACK_EXPANSION is "Values&" and its
+ PACK_EXPANSION_PARAMETER_PACKS will contain "Values". */
+DEFTREECODE (TYPE_PACK_EXPANSION, "type_pack_expansion", tcc_type, 0)
+
+/* Represents an expression that will be expanded into a list of
+ expressions when instantiated with one or more argument packs.
+
+ EXPR_PACK_EXPANSION plays precisely the same role as TYPE_PACK_EXPANSION,
+ but will be used for expressions. */
+DEFTREECODE (EXPR_PACK_EXPANSION, "expr_pack_expansion", tcc_expression, 1)
+
+/* Selects the Ith parameter out of an argument pack. This node will
+ be used when instantiating pack expansions; see
+ tsubst_pack_expansion.
+
+ ARGUMENT_PACK_SELECT_FROM_PACK contains the *_ARGUMENT_PACK node
+ from which the argument will be selected.
+
+ ARGUMENT_PACK_SELECT_INDEX contains the index into the argument
+ pack that will be returned by this ARGUMENT_PACK_SELECT node. The
+ index is a machine integer. */
+DEFTREECODE (ARGUMENT_PACK_SELECT, "argument_pack_select", tcc_exceptional, 0)
+
+/** C++ extensions. */
+
+/* Represents a trait expression during template expansion. */
+DEFTREECODE (TRAIT_EXPR, "trait_expr", tcc_exceptional, 0)
+
/*
Local variables:
mode:c
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