re PR fortran/64787 (Invalid code on sourced allocation of class(*) character string)

re PR fortran/64787 (Invalid code on sourced allocation of class(*) character string)

gcc/fortran/ChangeLog

2015-03-24  Andre Vehreschild  <vehre@gmx.de>

	PR fortran/64787
	PR fortran/57456
	PR fortran/63230
	* class.c (gfc_add_component_ref):  Free no longer needed
	ref-chains to prevent memory loss.
	(find_intrinsic_vtab): For deferred length char arrays or
	unlimited polymorphic objects, store the size in bytes of one
	character in the size component of the vtab.
	* gfortran.h: Added gfc_add_len_component () define.
	* trans-array.c (gfc_trans_create_temp_array): Switched to new
	function name for getting a class' vtab's field.
	(build_class_array_ref): Likewise.
	(gfc_array_init_size): Using the size information from allocate
	more consequently now, i.e., the typespec of the entity to
	allocate is no longer needed.  This is to address the last open
	comment in PR fortran/57456.
	(gfc_array_allocate): Likewise.
	(structure_alloc_comps): gfc_copy_class_to_class () needs to
	know whether the class is unlimited polymorphic.
	* trans-array.h: Changed interface of gfc_array_allocate () to
	reflect the no longer needed typespec.
	* trans-expr.c (gfc_find_and_cut_at_last_class_ref): New.
	(gfc_reset_len): New.
	(gfc_get_class_array_ref): Switch to new function name for
	getting a class' vtab's field.
	(gfc_copy_class_to_class):  Added flag to know whether the class
	to copy is unlimited polymorphic.  Adding _len dependent code
	then, which calls ->vptr->copy () with four arguments adding
	the length information ->vptr->copy(from, to, from_len, to_cap).
	(gfc_conv_procedure_call): Switch to new function name for
	getting a class' vtab's field.
	(alloc_scalar_allocatable_for_assignment): Use the string_length
	as computed by gfc_conv_expr and not the statically backend_decl
	which may be incorrect when ref-ing.
	(gfc_trans_assignment_1): Use the string_length variable and
	not the rse.string_length.  The former has been computed more
	generally.
	* trans-intrinsic.c (gfc_conv_intrinsic_sizeof): Switch to new
	function name for getting a class' vtab's field.
	(gfc_conv_intrinsic_storage_size): Likewise.
	(gfc_conv_intrinsic_transfer): Likewise.
	* trans-stmt.c (gfc_trans_allocate): Restructured to evaluate
	source=expr3 only once before the loop over the objects to
	allocate, when the objects are not arrays. Doing correct _len
	initialization and calling of vptr->copy () fixing PR 64787.
	(gfc_trans_deallocate): Reseting _len to 0, preventing future
	errors.
	* trans.c (gfc_build_array_ref): Switch to new function name
	for getting a class' vtab's field.
	(gfc_add_comp_finalizer_call): Likewise.
	* trans.h: Define the prototypes for the gfc_class_vtab_*_get ()
	and gfc_vptr_*_get () functions.
	Added gfc_find_and_cut_at_last_class_ref () and
	gfc_reset_len () routine prototype.  Added flag to
	gfc_copy_class_to_class () prototype to signal an unlimited
	polymorphic entity to copy.

gcc/testsuite/ChangeLog

2015-03-24  Andre Vehreschild  <vehre@gmx.de>

	* gfortran.dg/allocate_alloc_opt_13.f90: Added tests for
	source= and mold= expressions functionality.
	* gfortran.dg/allocate_class_4.f90: New test.
	* gfortran.dg/unlimited_polymorphic_20.f90: Added test whether
	copying an unlimited polymorhpic object containing a char array
	to another unlimited polymorphic object respects the _len
	component.
	* gfortran.dg/unlimited_polymorphic_22.f90: Extended to check
	whether deferred length char array allocate works, unlimited
	polymorphic object allocation from a string works and if
	allocating an array of deferred length strings works.
	* gfortran.dg/unlimited_polymorphic_24.f03: New test.

From-SVN: r221621