/* 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, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. Hacked by Michael Tiemann (tiemann@cygnus.com) This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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. */ /* An OFFSET_REF is used in two situations: 1. An expression of the form `A::m' where `A' is a class and `m' is a non-static member. In this case, operand 0 will be a TYPE (corresponding to `A') and operand 1 will be a FIELD_DECL, BASELINK, or TEMPLATE_ID_EXPR (corresponding to `m'). 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. 2. An expression of the form `x.*p'. In this case, operand 0 will be an expression corresponding to `x' and operand 1 will be an expression with pointer-to-member type. */ DEFTREECODE (OFFSET_REF, "offset_ref", tcc_reference, 2) /* A pointer-to-member constant. For a pointer-to-member constant `X::Y' The PTRMEM_CST_CLASS is the RECORD_TYPE for `X' and the PTRMEM_CST_MEMBER is the _DECL for `Y'. */ DEFTREECODE (PTRMEM_CST, "ptrmem_cst", tcc_constant, 0) /* For NEW_EXPR, operand 0 is the placement list. Operand 1 is the new-declarator. Operand 2 is the number of elements in the array. Operand 3 is the initializer. */ DEFTREECODE (NEW_EXPR, "nw_expr", tcc_expression, 4) DEFTREECODE (VEC_NEW_EXPR, "vec_nw_expr", tcc_expression, 3) /* For DELETE_EXPR, operand 0 is the store to be destroyed. Operand 1 is the value to pass to the destroying function saying whether the store should be deallocated as well. */ DEFTREECODE (DELETE_EXPR, "dl_expr", tcc_expression, 2) DEFTREECODE (VEC_DELETE_EXPR, "vec_dl_expr", tcc_expression, 2) /* Value is reference to particular overloaded class method. Operand 0 is the class, operand 1 is the field The COMPLEXITY field holds the class level (usually 0). */ DEFTREECODE (SCOPE_REF, "scope_ref", tcc_reference, 2) /* When composing an object with a member, this is the result. Operand 0 is the object. Operand 1 is the member (usually a dereferenced pointer to member). */ DEFTREECODE (MEMBER_REF, "member_ref", tcc_reference, 2) /* Type conversion operator in C++. TREE_TYPE is type that this 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) /* A throw expression. operand 0 is the expression, if there was one, else it is NULL_TREE. */ DEFTREECODE (THROW_EXPR, "throw_expr", tcc_expression, 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", 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. A BASELINK is an expression; the TREE_TYPE of the BASELINK gives the type of the expression. This type is either a FUNCTION_TYPE, METHOD_TYPE, or `unknown_type_node' indicating that the function is overloaded. */ DEFTREECODE (BASELINK, "baselink", tcc_exceptional, 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. 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 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) */ DEFTREECODE (TEMPLATE_DECL, "template_decl", tcc_declaration, 0) /* Index into a template parameter list. The TEMPLATE_PARM_IDX gives the index (from 0) of the parameter, while the TEMPLATE_PARM_LEVEL gives the level (from 1) of the parameter. Here's an example: template // Index 0, Level 1. struct S { template // 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 its LEVEL will be one less. The TREE_CHAIN field is used to chain together the descendants. The TEMPLATE_PARM_DECL is the declaration of this parameter, either a TYPE_DECL or CONST_DECL. The TEMPLATE_PARM_ORIG_LEVEL is the LEVEL of the most distant parent, i.e., the LEVEL that the parameter originally had when it was declared. For example, if we instantiate S, we will have: struct S { template // 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 TEMPLATE_PARM_INDEX. It is used without template arguments like TT in C, 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) /* The ordering of the following codes is optimized for the checking 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. */ DEFTREECODE (TEMPLATE_TYPE_PARM, "template_type_parm", tcc_type, 0) /* A type designated by `typename T::t'. TYPE_CONTEXT is `T', TYPE_NAME is an IDENTIFIER_NODE for `t'. If the type was named via template-id, TYPENAME_TYPE_FULLNAME will hold the TEMPLATE_ID_EXPR. TREE_TYPE is always NULL. */ DEFTREECODE (TYPENAME_TYPE, "typename_type", tcc_type, 0) /* A type designated by `__typeof (expr)'. TYPEOF_TYPE_EXPR is the expression in question. */ DEFTREECODE (TYPEOF_TYPE, "typeof_type", tcc_type, 0) /* Like TEMPLATE_TEMPLATE_PARM it is used with bound template arguments like TT. In this case, TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO contains the template name and its bound arguments. TYPE_NAME is a TYPE_DECL. */ DEFTREECODE (BOUND_TEMPLATE_TEMPLATE_PARM, "bound_template_template_parm", tcc_type, 0) /* For template template argument of the form `T::template C'. TYPE_CONTEXT is `T', the template parameter dependent object. 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. */ DEFTREECODE (USING_DECL, "using_decl", tcc_declaration, 0) /* A using directive. The operand is USING_STMT_NAMESPACE. */ DEFTREECODE (USING_STMT, "using_directive", tcc_expression, 1) /* An un-parsed default argument. Looks like an IDENTIFIER_NODE. */ DEFTREECODE (DEFAULT_ARG, "default_arg", tcc_exceptional, 0) /* A template-id, like foo. The first operand is the template. The second is NULL if there are no explicit arguments, or a TREE_VEC of arguments. The template will be a FUNCTION_DECL, TEMPLATE_DECL, or an OVERLOAD. If the template-id refers to a 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 the original name, and the parameter is the FUNCTION_DECL. */ DEFTREECODE (OVERLOAD, "overload", tcc_exceptional, 0) /* A pseudo-destructor, of the form "OBJECT.~DESTRUCTOR" or "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. 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. */ DEFTREECODE (PSEUDO_DTOR_EXPR, "pseudo_dtor_expr", tcc_expression, 3) /* A whole bunch of tree codes for the initial, superficial parsing of templates. */ DEFTREECODE (MODOP_EXPR, "modop_expr", tcc_expression, 3) DEFTREECODE (CAST_EXPR, "cast_expr", tcc_unary, 1) DEFTREECODE (REINTERPRET_CAST_EXPR, "reinterpret_cast_expr", tcc_unary, 1) DEFTREECODE (CONST_CAST_EXPR, "const_cast_expr", tcc_unary, 1) DEFTREECODE (STATIC_CAST_EXPR, "static_cast_expr", tcc_unary, 1) DEFTREECODE (DYNAMIC_CAST_EXPR, "dynamic_cast_expr", tcc_unary, 1) DEFTREECODE (DOTSTAR_EXPR, "dotstar_expr", tcc_expression, 2) DEFTREECODE (TYPEID_EXPR, "typeid_expr", tcc_expression, 1) /* A placeholder for an expression that is not type-dependent, but does occur in a template. When an expression that is not type-dependent appears in a larger expression, we must compute the type of that larger expression. That computation would normally modify the original expression, which would change the mangling of that expression if it appeared in a template argument list. In that situation, we create a NON_DEPENDENT_EXPR to take the place of the original expression. The expression is the only operand -- it is only needed for diagnostics. */ DEFTREECODE (NON_DEPENDENT_EXPR, "non_dependent_expr", tcc_expression, 1) /* CTOR_INITIALIZER is a placeholder in template code for a call to setup_vtbl_pointer (and appears in all functions, not just ctors). */ DEFTREECODE (CTOR_INITIALIZER, "ctor_initializer", tcc_expression, 1) DEFTREECODE (TRY_BLOCK, "try_block", tcc_expression, 2) DEFTREECODE (EH_SPEC_BLOCK, "eh_spec_block", tcc_expression, 2) /* A HANDLER wraps a catch handler for the HANDLER_TYPE. If this is CATCH_ALL_TYPE, then the handler catches all types. The declaration of the catch variable is in HANDLER_PARMS, and the body block in HANDLER_BODY. */ DEFTREECODE (HANDLER, "handler", tcc_expression, 2) /* A MUST_NOT_THROW_EXPR wraps an expression that may not throw, and must call terminate if it does. */ DEFTREECODE (MUST_NOT_THROW_EXPR, "must_not_throw_expr", tcc_expression, 1) /* A CLEANUP_STMT marks the point at which a declaration is fully constructed. The CLEANUP_EXPR is run on behalf of CLEANUP_DECL when CLEANUP_BODY completes. */ DEFTREECODE (CLEANUP_STMT, "cleanup_stmt", tcc_expression, 3) /* 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 and COND_EXPR for the benefit of templates. */ DEFTREECODE (IF_STMT, "if_stmt", tcc_expression, 3) /* Used to represent a `for' statement. The operands are FOR_INIT_STMT, FOR_COND, FOR_EXPR, and FOR_BODY, respectively. */ DEFTREECODE (FOR_STMT, "for_stmt", tcc_expression, 4) /* Used to represent a 'while' statement. The operands are WHILE_COND and WHILE_BODY, respectively. */ DEFTREECODE (WHILE_STMT, "while_stmt", tcc_expression, 2) /* Used to represent a 'do' statement. The operands are DO_BODY and DO_COND, respectively. */ DEFTREECODE (DO_STMT, "do_stmt", tcc_expression, 2) /* Used to represent a 'break' statement. */ DEFTREECODE (BREAK_STMT, "break_stmt", tcc_expression, 0) /* Used to represent a 'continue' statement. */ DEFTREECODE (CONTINUE_STMT, "continue_stmt", tcc_expression, 0) /* Used to represent a 'switch' statement. The operands are SWITCH_STMT_COND, SWITCH_STMT_BODY and SWITCH_STMT_TYPE, respectively. */ DEFTREECODE (SWITCH_STMT, "switch_stmt", tcc_expression, 3) DEFTREECODE (TAG_DEFN, "tag_defn", tcc_expression, 0) /* Template instantiation level node. TINST_DECL contains the original DECL node. TINST_LOCATION contains the location where the template is instantiated. TINST_IN_SYSTEM_HEADER_P is true if the location is in a system header. A stack of template instantiation nodes is kept through the TREE_CHAIN fields of these nodes. */ DEFTREECODE (TINST_LEVEL, "TINST_LEVEL", tcc_exceptional, 0) /* Represents an 'offsetof' expression during template expansion. */ DEFTREECODE (OFFSETOF_EXPR, "offsetof_expr", tcc_expression, 1) /* Local variables: mode:c End: */