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re PR c++/87 (member template assignment operator)
cp: PR g++/87 * cp-tree.h (DECL_COPY_CONSTRUCTOR_P): Use copy_fn_p. (copy_args_p): Rename to ... (copy_fn_p): ... here. (grok_special_member_properties): New function. (grok_op_properties): Lose VIRTUALP parameter. (copy_assignment_arg_p): Remove. * call.c (build_over_call): Use copy_fn_p. * decl.c (grokfndecl): Reformat. Adjust call to grok_op_properties. (copy_args_p): Rename to ... (copy_fn_p): ... here. Reject template functions. Check for pass by value. (grok_special_member_properties): Remember special functions. (grok_ctor_properties): Don't remember them here, just check. (grok_op_properties): Likewise. (start_method): Call grok_special_member_properties. * decl2.c (grokfield): Likewise. (copy_assignment_arg_p): Remove. (grok_function_init): Don't remember abstract assignment here. * pt.c (instantiate_class_template): Call grok_special_member_properties. (tsubst_decl): Adjust grok_op_properties call. testsuite: * g++.dg/other/copy1.C: New test. From-SVN: r47813
This commit is contained in:
Nathan Sidwell
Nathan Sidwell
parent
b365613798
commit
271e6f02a1
@ -1,3 +1,29 @@
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2001-12-04 Nathan Sidwell <nathan@codesourcery.com>
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PR g++/87
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* cp-tree.h (DECL_COPY_CONSTRUCTOR_P): Use copy_fn_p.
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(copy_args_p): Rename to ...
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(copy_fn_p): ... here.
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(grok_special_member_properties): New function.
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(grok_op_properties): Lose VIRTUALP parameter.
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(copy_assignment_arg_p): Remove.
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* call.c (build_over_call): Use copy_fn_p.
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* decl.c (grokfndecl): Reformat. Adjust call to
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grok_op_properties.
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(copy_args_p): Rename to ...
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(copy_fn_p): ... here. Reject template functions. Check for pass
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by value.
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(grok_special_member_properties): Remember special functions.
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(grok_ctor_properties): Don't remember them here, just check.
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(grok_op_properties): Likewise.
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(start_method): Call grok_special_member_properties.
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* decl2.c (grokfield): Likewise.
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(copy_assignment_arg_p): Remove.
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(grok_function_init): Don't remember abstract assignment here.
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* pt.c (instantiate_class_template): Call
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grok_special_member_properties.
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(tsubst_decl): Adjust grok_op_properties call.
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2001-12-08 Aldy Hernandez <aldyh@redhat.com>
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* lex.c (rid_to_yy): Add RID_CHOOSE_EXPR and
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@ -4280,7 +4280,7 @@ build_over_call (cand, args, flags)
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}
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}
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else if (DECL_OVERLOADED_OPERATOR_P (fn) == NOP_EXPR
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&& copy_args_p (fn)
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&& copy_fn_p (fn)
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&& TYPE_HAS_TRIVIAL_ASSIGN_REF (DECL_CONTEXT (fn)))
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{
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tree to = stabilize_reference
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@ -1841,7 +1841,7 @@ struct lang_decl
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/* Nonzero if NODE (a FUNCTION_DECL) is a copy constructor. */
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#define DECL_COPY_CONSTRUCTOR_P(NODE) \
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(DECL_CONSTRUCTOR_P (NODE) && copy_args_p (NODE))
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(DECL_CONSTRUCTOR_P (NODE) && copy_fn_p (NODE) > 0)
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/* Nonzero if NODE is a destructor. */
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#define DECL_DESTRUCTOR_P(NODE) \
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@ -3690,9 +3690,10 @@ extern int complete_array_type PARAMS ((tree, tree, int));
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extern tree build_ptrmemfunc_type PARAMS ((tree));
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/* the grokdeclarator prototype is in decl.h */
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extern int parmlist_is_exprlist PARAMS ((tree));
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extern int copy_args_p PARAMS ((tree));
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extern int copy_fn_p PARAMS ((tree));
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extern void grok_special_member_properties PARAMS ((tree));
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extern int grok_ctor_properties PARAMS ((tree, tree));
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extern void grok_op_properties PARAMS ((tree, int, int));
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extern void grok_op_properties PARAMS ((tree, int));
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extern tree xref_tag PARAMS ((tree, tree, int));
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extern tree xref_tag_from_type PARAMS ((tree, tree, int));
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extern void xref_basetypes PARAMS ((tree, tree, tree, tree));
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@ -3757,7 +3758,6 @@ extern tree grokfield PARAMS ((tree, tree, tree, tree, tree));
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extern tree grokbitfield PARAMS ((tree, tree, tree));
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extern tree groktypefield PARAMS ((tree, tree));
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extern tree grokoptypename PARAMS ((tree, tree));
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extern int copy_assignment_arg_p PARAMS ((tree, int));
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extern void cplus_decl_attributes PARAMS ((tree *, tree, int));
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extern tree constructor_name_full PARAMS ((tree));
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extern tree constructor_name PARAMS ((tree));
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237
gcc/cp/decl.c
237
gcc/cp/decl.c
@ -8789,9 +8789,7 @@ grokfndecl (ctype, type, declarator, orig_declarator, virtualp, flags, quals,
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tree t;
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if (raises)
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{
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type = build_exception_variant (type, raises);
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}
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type = build_exception_variant (type, raises);
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decl = build_lang_decl (FUNCTION_DECL, declarator, type);
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/* Propagate volatile out from type to decl. */
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@ -8902,7 +8900,7 @@ grokfndecl (ctype, type, declarator, orig_declarator, virtualp, flags, quals,
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}
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if (IDENTIFIER_OPNAME_P (DECL_NAME (decl)))
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grok_op_properties (decl, virtualp, check < 0);
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grok_op_properties (decl, friendp);
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if (ctype && decl_function_context (decl))
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DECL_NO_STATIC_CHAIN (decl) = 1;
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@ -12053,90 +12051,150 @@ grokparms (first_parm)
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}
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/* D is a constructor or overloaded `operator='. Returns non-zero if
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D's arguments allow it to be a copy constructor, or copy assignment
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/* D is a constructor or overloaded `operator='.
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Let T be the class in which D is declared. Then, this function
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returns:
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-1 if D's is an ill-formed constructor or copy assignment operator
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whose first parameter is of type `T'.
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0 if D is not a copy constructor or copy assignment
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operator.
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1 if D is a copy constructor or copy assignment operator whose
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first parameter is a reference to const qualified T.
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2 if D is a copy constructor or copy assignment operator whose
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first parameter is a reference to non-const qualified T.
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This function can be used as a predicate. Positive values indicate
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a copy constructor and non-zero values indicate a copy assignment
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operator. */
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int
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copy_args_p (d)
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copy_fn_p (d)
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tree d;
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{
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tree t;
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tree args;
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tree arg_type;
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int result = 1;
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my_friendly_assert (DECL_FUNCTION_MEMBER_P (d), 20011208);
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if (!DECL_FUNCTION_MEMBER_P (d))
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if (DECL_TEMPLATE_INFO (d) && is_member_template (DECL_TI_TEMPLATE (d)))
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/* Instantiations of template member functions are never copy
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functions. Note that member functions of templated classes are
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represented as template functions internally, and we must
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accept those as copy functions. */
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return 0;
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args = FUNCTION_FIRST_USER_PARMTYPE (d);
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if (!args)
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return 0;
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t = FUNCTION_FIRST_USER_PARMTYPE (d);
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if (t && TREE_CODE (TREE_VALUE (t)) == REFERENCE_TYPE
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&& (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_VALUE (t)))
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== DECL_CONTEXT (d))
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&& (TREE_CHAIN (t) == NULL_TREE
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|| TREE_CHAIN (t) == void_list_node
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|| TREE_PURPOSE (TREE_CHAIN (t))))
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return 1;
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return 0;
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arg_type = TREE_VALUE (args);
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if (TYPE_MAIN_VARIANT (arg_type) == DECL_CONTEXT (d))
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{
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/* Pass by value copy assignment operator. */
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result = -1;
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}
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else if (TREE_CODE (arg_type) == REFERENCE_TYPE
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&& TYPE_MAIN_VARIANT (TREE_TYPE (arg_type)) == DECL_CONTEXT (d))
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{
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if (CP_TYPE_CONST_P (TREE_TYPE (arg_type)))
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result = 2;
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}
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else
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return 0;
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args = TREE_CHAIN (args);
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if (args && args != void_list_node && !TREE_PURPOSE (args))
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/* There are more non-optional args. */
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return 0;
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return result;
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}
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/* These memoizing functions keep track of special properties which
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a class may have. `grok_ctor_properties' notices whether a class
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has a constructor of the form X(X&), and also complains
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if the class has a constructor of the form X(X).
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`grok_op_properties' takes notice of the various forms of
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operator= which are defined, as well as what sorts of type conversion
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may apply. Both functions take a FUNCTION_DECL as an argument. */
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/* Remember any special properties of member function DECL. */
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void grok_special_member_properties (decl)
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tree decl;
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{
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if (!DECL_NONSTATIC_MEMBER_FUNCTION_P(decl))
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; /* Not special. */
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else if (DECL_CONSTRUCTOR_P (decl))
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{
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int ctor = copy_fn_p (decl);
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if (ctor > 0)
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{
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/* [class.copy]
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A non-template constructor for class X is a copy
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constructor if its first parameter is of type X&, const
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X&, volatile X& or const volatile X&, and either there
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are no other parameters or else all other parameters have
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default arguments. */
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TYPE_HAS_INIT_REF (DECL_CONTEXT (decl)) = 1;
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if (ctor > 1)
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TYPE_HAS_CONST_INIT_REF (DECL_CONTEXT (decl)) = 1;
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}
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else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
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TYPE_HAS_DEFAULT_CONSTRUCTOR (DECL_CONTEXT (decl)) = 1;
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}
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else if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
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{
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/* [class.copy]
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A non-template assignment operator for class X is a copy
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assignment operator if its parameter is of type X, X&, const
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X&, volatile X& or const volatile X&. */
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int assop = copy_fn_p (decl);
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if (assop)
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{
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TYPE_HAS_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
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if (assop != 1)
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TYPE_HAS_CONST_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
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if (DECL_PURE_VIRTUAL_P (decl))
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TYPE_HAS_ABSTRACT_ASSIGN_REF (DECL_CONTEXT (decl)) = 1;
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}
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}
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}
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/* Check a constructor DECL has the correct form. Complains
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if the class has a constructor of the form X(X). */
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int
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grok_ctor_properties (ctype, decl)
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tree ctype, decl;
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{
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tree parmtypes = FUNCTION_FIRST_USER_PARMTYPE (decl);
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tree parmtype = parmtypes ? TREE_VALUE (parmtypes) : void_type_node;
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int ctor_parm = copy_fn_p (decl);
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/* [class.copy]
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A non-template constructor for class X is a copy constructor if
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its first parameter is of type X&, const X&, volatile X& or const
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volatile X&, and either there are no other parameters or else all
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other parameters have default arguments. */
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if (TREE_CODE (parmtype) == REFERENCE_TYPE
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&& TYPE_MAIN_VARIANT (TREE_TYPE (parmtype)) == ctype
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&& sufficient_parms_p (TREE_CHAIN (parmtypes))
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&& !(DECL_TEMPLATE_INSTANTIATION (decl)
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&& is_member_template (DECL_TI_TEMPLATE (decl))))
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{
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TYPE_HAS_INIT_REF (ctype) = 1;
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if (CP_TYPE_CONST_P (TREE_TYPE (parmtype)))
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TYPE_HAS_CONST_INIT_REF (ctype) = 1;
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}
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/* [class.copy]
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A declaration of a constructor for a class X is ill-formed if its
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first parameter is of type (optionally cv-qualified) X and either
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there are no other parameters or else all other parameters have
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default arguments.
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We *don't* complain about member template instantiations that
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have this form, though; they can occur as we try to decide what
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constructor to use during overload resolution. Since overload
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resolution will never prefer such a constructor to the
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non-template copy constructor (which is either explicitly or
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implicitly defined), there's no need to worry about their
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existence. Theoretically, they should never even be
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instantiated, but that's hard to forestall. */
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else if (TYPE_MAIN_VARIANT (parmtype) == ctype
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&& sufficient_parms_p (TREE_CHAIN (parmtypes))
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&& !(DECL_TEMPLATE_INSTANTIATION (decl)
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&& is_member_template (DECL_TI_TEMPLATE (decl))))
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if (ctor_parm < 0)
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{
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/* [class.copy]
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A declaration of a constructor for a class X is ill-formed if
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its first parameter is of type (optionally cv-qualified) X
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and either there are no other parameters or else all other
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parameters have default arguments.
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We *don't* complain about member template instantiations that
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have this form, though; they can occur as we try to decide
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what constructor to use during overload resolution. Since
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overload resolution will never prefer such a constructor to
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the non-template copy constructor (which is either explicitly
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or implicitly defined), there's no need to worry about their
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existence. Theoretically, they should never even be
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instantiated, but that's hard to forestall. */
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cp_error ("invalid constructor; you probably meant `%T (const %T&)'",
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ctype, ctype);
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SET_IDENTIFIER_ERROR_LOCUS (DECL_NAME (decl), ctype);
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return 0;
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}
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else if (TREE_CODE (parmtype) == VOID_TYPE
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|| TREE_PURPOSE (parmtypes) != NULL_TREE)
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TYPE_HAS_DEFAULT_CONSTRUCTOR (ctype) = 1;
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return 1;
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}
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@ -12169,9 +12227,9 @@ unary_op_p (code)
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/* Do a little sanity-checking on how they declared their operator. */
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void
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grok_op_properties (decl, virtualp, friendp)
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grok_op_properties (decl, friendp)
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tree decl;
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int virtualp, friendp;
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int friendp;
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{
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tree argtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
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tree argtype;
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@ -12341,37 +12399,7 @@ grok_op_properties (decl, virtualp, friendp)
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ref ? "a reference to " : "", what);
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}
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}
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if (DECL_ASSIGNMENT_OPERATOR_P (decl)
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&& operator_code == NOP_EXPR)
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{
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tree parmtype;
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if (arity != 2 && methodp)
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{
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cp_error ("`%D' must take exactly one argument", decl);
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return;
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}
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parmtype = TREE_VALUE (TREE_CHAIN (argtypes));
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/* [class.copy]
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A user-declared copy assignment operator X::operator= is
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a non-static non-template member function of class X with
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exactly one parameter of type X, X&, const X&, volatile
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X& or const volatile X&. */
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if (copy_assignment_arg_p (parmtype, virtualp)
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&& !(DECL_TEMPLATE_INSTANTIATION (decl)
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&& is_member_template (DECL_TI_TEMPLATE (decl)))
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&& ! friendp)
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{
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TYPE_HAS_ASSIGN_REF (current_class_type) = 1;
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if (TREE_CODE (parmtype) != REFERENCE_TYPE
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|| CP_TYPE_CONST_P (TREE_TYPE (parmtype)))
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TYPE_HAS_CONST_ASSIGN_REF (current_class_type) = 1;
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}
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}
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else if (operator_code == COND_EXPR)
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if (operator_code == COND_EXPR)
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{
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/* 13.4.0.3 */
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cp_error ("ISO C++ prohibits overloading operator ?:");
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@ -12507,7 +12535,7 @@ grok_op_properties (decl, virtualp, friendp)
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&& TREE_CODE (TREE_TYPE (TREE_TYPE (decl))) == REFERENCE_TYPE)
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cp_warning ("`%D' should return by value", decl);
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/* 13.4.0.8 */
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/* [over.oper]/8 */
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for (; argtypes && argtypes != void_list_node;
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argtypes = TREE_CHAIN (argtypes))
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if (TREE_PURPOSE (argtypes))
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@ -14244,14 +14272,7 @@ start_method (declspecs, declarator, attrlist)
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fndecl = copy_node (fndecl);
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TREE_CHAIN (fndecl) = NULL_TREE;
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}
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if (DECL_CONSTRUCTOR_P (fndecl))
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{
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if (! grok_ctor_properties (current_class_type, fndecl))
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return void_type_node;
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}
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else if (IDENTIFIER_OPNAME_P (DECL_NAME (fndecl)))
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grok_op_properties (fndecl, DECL_VIRTUAL_P (fndecl), 0);
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grok_special_member_properties (fndecl);
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}
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cp_finish_decl (fndecl, NULL_TREE, NULL_TREE, 0);
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@ -1645,6 +1645,9 @@ grokfield (declarator, declspecs, init, asmspec_tree, attrlist)
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SET_DECL_RTL (value, NULL_RTX);
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SET_DECL_ASSEMBLER_NAME (value, get_identifier (asmspec));
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}
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if (!DECL_FRIEND_P (value))
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grok_special_member_properties (value);
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cp_finish_decl (value, init, asmspec_tree, flags);
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/* Pass friends back this way. */
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@ -1762,28 +1765,6 @@ grokoptypename (declspecs, declarator)
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*/
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int
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copy_assignment_arg_p (parmtype, virtualp)
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tree parmtype;
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int virtualp ATTRIBUTE_UNUSED;
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{
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if (current_class_type == NULL_TREE)
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return 0;
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if (TREE_CODE (parmtype) == REFERENCE_TYPE)
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parmtype = TREE_TYPE (parmtype);
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if ((TYPE_MAIN_VARIANT (parmtype) == current_class_type)
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#if 0
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/* Non-standard hack to support old Booch components. */
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|| (! virtualp && DERIVED_FROM_P (parmtype, current_class_type))
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#endif
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)
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return 1;
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return 0;
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}
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static void
|
||||
grok_function_init (decl, init)
|
||||
tree decl;
|
||||
@ -1796,17 +1777,7 @@ grok_function_init (decl, init)
|
||||
if (TREE_CODE (type) == FUNCTION_TYPE)
|
||||
cp_error ("initializer specified for non-member function `%D'", decl);
|
||||
else if (integer_zerop (init))
|
||||
{
|
||||
DECL_PURE_VIRTUAL_P (decl) = 1;
|
||||
if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
|
||||
{
|
||||
tree parmtype
|
||||
= TREE_VALUE (TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (decl))));
|
||||
|
||||
if (copy_assignment_arg_p (parmtype, 1))
|
||||
TYPE_HAS_ABSTRACT_ASSIGN_REF (current_class_type) = 1;
|
||||
}
|
||||
}
|
||||
DECL_PURE_VIRTUAL_P (decl) = 1;
|
||||
else
|
||||
cp_error ("invalid initializer for virtual method `%D'", decl);
|
||||
}
|
||||
|
||||
@ -5186,6 +5186,7 @@ instantiate_class_template (type)
|
||||
{
|
||||
tree r = tsubst (t, args, /*complain=*/1, NULL_TREE);
|
||||
set_current_access_from_decl (r);
|
||||
grok_special_member_properties (r);
|
||||
finish_member_declaration (r);
|
||||
}
|
||||
|
||||
@ -5895,10 +5896,10 @@ tsubst_decl (t, args, type)
|
||||
If it isn't, that'll be handled by
|
||||
clone_constructors_and_destructors. */
|
||||
if (PRIMARY_TEMPLATE_P (gen_tmpl))
|
||||
clone_function_decl(r, /*update_method_vec_p=*/0);
|
||||
clone_function_decl (r, /*update_method_vec_p=*/0);
|
||||
}
|
||||
else if (IDENTIFIER_OPNAME_P (DECL_NAME (r)))
|
||||
grok_op_properties (r, DECL_VIRTUAL_P (r), DECL_FRIEND_P (r));
|
||||
grok_op_properties (r, DECL_FRIEND_P (r));
|
||||
}
|
||||
break;
|
||||
|
||||
|
||||
@ -1,3 +1,7 @@
|
||||
2001-12-09 Nathan Sidwell <nathan@codesourcery.com>
|
||||
|
||||
* g++.dg/other/copy1.C: New test.
|
||||
|
||||
2001-10-08 Aldy Hernandez <aldyh@redhat.com>
|
||||
|
||||
* gcc.c-torture/execute/builtin-types-compatible-p.c: New.
|
||||
|
||||
83
gcc/testsuite/g++.dg/other/copy1.C
Normal file
83
gcc/testsuite/g++.dg/other/copy1.C
Normal file
@ -0,0 +1,83 @@
|
||||
// { dg-do run }
|
||||
|
||||
// Copyright (C) 2000 Free Software Foundation, Inc.
|
||||
// Contributed by Nathan Sidwell 30 Nov 2001 <nathan@nathan@codesourcery.com>
|
||||
|
||||
// PR 87
|
||||
|
||||
int assign = 0;
|
||||
int ctor = 0;
|
||||
int assignC = 0;
|
||||
|
||||
struct A {
|
||||
int i;
|
||||
|
||||
template<class T>
|
||||
void operator=(const T&) const
|
||||
{
|
||||
assign = 1;
|
||||
}
|
||||
|
||||
A () : i (0) {}
|
||||
|
||||
template <typename T> A (const T &)
|
||||
{
|
||||
ctor = 1;
|
||||
}
|
||||
};
|
||||
|
||||
struct B : A
|
||||
{
|
||||
};
|
||||
|
||||
struct C
|
||||
{
|
||||
int i;
|
||||
|
||||
C (int i_) :i (i_) {}
|
||||
|
||||
template <int I>
|
||||
void operator= (const C &)
|
||||
{
|
||||
assignC = 1;
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
int main()
|
||||
{
|
||||
const A a;
|
||||
A b;
|
||||
B c;
|
||||
|
||||
b = a;
|
||||
if (assign)
|
||||
return 5;
|
||||
|
||||
b.i = 100;
|
||||
c.i = 200;
|
||||
|
||||
a = b;
|
||||
|
||||
if (!assign)
|
||||
return 1;
|
||||
if (a.i)
|
||||
return 2;
|
||||
|
||||
A e (b);
|
||||
if (ctor)
|
||||
return 3;
|
||||
|
||||
A d (c);
|
||||
if (!ctor)
|
||||
return 4;
|
||||
|
||||
C c0 (0);
|
||||
C c1 (1);
|
||||
|
||||
c0 = c1;
|
||||
if (assignC)
|
||||
return 5;
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user