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re PR fortran/37779 (Missing RECURSIVE not detected)

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2008-11-30  Daniel Kraft  <d@domob.eu>

	PR fortran/37779
	* gfortran.h (struct gfc_entry_list): Fixed typo in comment.
	* resolve.c (is_illegal_recursion): New method.
	(resolve_procedure_expression): Use new is_illegal_recursion instead of
	direct check and handle function symbols correctly.
	(resolve_actual_arglist): Removed useless recursion check.
	(resolve_function): Use is_illegal_recursion instead of direct check.
	(resolve_call): Ditto.

2008-11-30  Daniel Kraft  <d@domob.eu>

	PR fortran/37779
	* gfortran.dg/recursive_check_1.f: Changed expected error message to
	the more general new one.
	* gfortran.dg/recursive_check_2.f90: Ditto.
	* gfortran.dg/entry_18.f90: Ditto.
	* gfortran.dg/recursive_check_4.f03: Do "the same" check also for
	FUNCTIONS, as this is different in details from SUBROUTINES.
	* gfortran.dg/recursive_check_6.f03: New test.

From-SVN: r142299
This commit is contained in:
Daniel Kraft 2008-11-30 21:36:10 +01:00 committed by Daniel Kraft
parent 72b415c586
commit 1933ba0f5d
9 changed files with 182 additions and 50 deletions
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11
gcc/fortran/ChangeLog
View File

@ -1,3 +1,14 @@
2008-11-30 Daniel Kraft <d@domob.eu>
PR fortran/37779
* gfortran.h (struct gfc_entry_list): Fixed typo in comment.
* resolve.c (is_illegal_recursion): New method.
(resolve_procedure_expression): Use new is_illegal_recursion instead of
direct check and handle function symbols correctly.
(resolve_actual_arglist): Removed useless recursion check.
(resolve_function): Use is_illegal_recursion instead of direct check.
(resolve_call): Ditto.
2008-11-29 Eric Botcazou <ebotcazou@adacore.com>
* trans-array.c (gfc_conv_array_parameter): Guard union access.

2
gcc/fortran/gfortran.h
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@ -1157,7 +1157,7 @@ typedef struct gfc_entry_list
int id;
/* The LABEL_EXPR marking this entry point. */
tree label;
/* The nest item in the list. */
/* The next item in the list. */
struct gfc_entry_list *next;
}
gfc_entry_list;

120
gcc/fortran/resolve.c
View File

@ -1073,6 +1073,58 @@ count_specific_procs (gfc_expr *e)
}
/* See if a call to sym could possibly be a not allowed RECURSION because of
a missing RECURIVE declaration. This means that either sym is the current
context itself, or sym is the parent of a contained procedure calling its
non-RECURSIVE containing procedure.
This also works if sym is an ENTRY. */
static bool
is_illegal_recursion (gfc_symbol* sym, gfc_namespace* context)
{
gfc_symbol* proc_sym;
gfc_symbol* context_proc;
gcc_assert (sym->attr.flavor == FL_PROCEDURE);
/* If we've got an ENTRY, find real procedure. */
if (sym->attr.entry && sym->ns->entries)
proc_sym = sym->ns->entries->sym;
else
proc_sym = sym;
/* If sym is RECURSIVE, all is well of course. */
if (proc_sym->attr.recursive || gfc_option.flag_recursive)
return false;
/* Find the context procdure's "real" symbol if it has entries. */
context_proc = (context->entries ? context->entries->sym
: context->proc_name);
if (!context_proc)
return true;
/* A call from sym's body to itself is recursion, of course. */
if (context_proc == proc_sym)
return true;
/* The same is true if context is a contained procedure and sym the
containing one. */
if (context_proc->attr.contained)
{
gfc_symbol* parent_proc;
gcc_assert (context->parent);
parent_proc = (context->parent->entries ? context->parent->entries->sym
: context->parent->proc_name);
if (parent_proc == proc_sym)
return true;
}
return false;
}
/* Resolve a procedure expression, like passing it to a called procedure or as
RHS for a procedure pointer assignment. */
@ -1081,16 +1133,18 @@ resolve_procedure_expression (gfc_expr* expr)
{
gfc_symbol* sym;
if (expr->ts.type != BT_PROCEDURE || expr->expr_type != EXPR_VARIABLE)
if (expr->expr_type != EXPR_VARIABLE)
return SUCCESS;
gcc_assert (expr->symtree);
sym = expr->symtree->n.sym;
gcc_assert (sym->attr.flavor == FL_PROCEDURE);
if (sym->attr.flavor != FL_PROCEDURE
|| (sym->attr.function && sym->result == sym))
return SUCCESS;
/* A non-RECURSIVE procedure that is used as procedure expression within its
own body is in danger of being called recursively. */
if (!sym->attr.recursive && sym == gfc_current_ns->proc_name
&& !gfc_option.flag_recursive)
if (is_illegal_recursion (sym, gfc_current_ns))
gfc_warning ("Non-RECURSIVE procedure '%s' at %L is possibly calling"
" itself recursively. Declare it RECURSIVE or use"
" -frecursive", sym->name, &expr->where);
@ -1203,15 +1257,6 @@ resolve_actual_arglist (gfc_actual_arglist *arg, procedure_type ptype,
/* Just in case a specific was found for the expression. */
sym = e->symtree->n.sym;
if (sym->attr.entry && sym->ns->entries
&& sym->ns == gfc_current_ns
&& !sym->ns->entries->sym->attr.recursive)
{
gfc_error ("Reference to ENTRY '%s' at %L is recursive, but"
" procedure '%s' is not declared as RECURSIVE",
sym->name, &e->where, sym->ns->entries->sym->name);
}
/* If the symbol is the function that names the current (or
parent) scope, then we really have a variable reference. */
@ -2455,22 +2500,19 @@ resolve_function (gfc_expr *expr)
* call themselves. */
if (expr->value.function.esym && !expr->value.function.esym->attr.recursive)
{
gfc_symbol *esym, *proc;
gfc_symbol *esym;
esym = expr->value.function.esym;
proc = gfc_current_ns->proc_name;
if (esym == proc)
{
gfc_error ("Function '%s' at %L cannot call itself, as it is not "
"RECURSIVE", name, &expr->where);
t = FAILURE;
}
if (esym->attr.entry && esym->ns->entries && proc->ns->entries
&& esym->ns->entries->sym == proc->ns->entries->sym)
if (is_illegal_recursion (esym, gfc_current_ns))
{
gfc_error ("Call to ENTRY '%s' at %L is recursive, but function "
"'%s' is not declared as RECURSIVE",
esym->name, &expr->where, esym->ns->entries->sym->name);
if (esym->attr.entry && esym->ns->entries)
gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
" function '%s' is not RECURSIVE",
esym->name, &expr->where, esym->ns->entries->sym->name);
else
gfc_error ("Function '%s' at %L cannot be called recursively, as it"
" is not RECURSIVE", esym->name, &expr->where);
t = FAILURE;
}
}
@ -2920,25 +2962,17 @@ resolve_call (gfc_code *c)
/* Subroutines without the RECURSIVE attribution are not allowed to
* call themselves. */
if (csym && !csym->attr.recursive)
if (csym && is_illegal_recursion (csym, gfc_current_ns))
{
gfc_symbol *proc;
proc = gfc_current_ns->proc_name;
if (csym == proc)
{
gfc_error ("SUBROUTINE '%s' at %L cannot call itself, as it is not "
"RECURSIVE", csym->name, &c->loc);
t = FAILURE;
}
if (csym->attr.entry && csym->ns->entries && proc->ns->entries
&& csym->ns->entries->sym == proc->ns->entries->sym)
{
gfc_error ("Call to ENTRY '%s' at %L is recursive, but subroutine "
"'%s' is not declared as RECURSIVE",
if (csym->attr.entry && csym->ns->entries)
gfc_error ("ENTRY '%s' at %L cannot be called recursively, as"
" subroutine '%s' is not RECURSIVE",
csym->name, &c->loc, csym->ns->entries->sym->name);
t = FAILURE;
}
else
gfc_error ("SUBROUTINE '%s' at %L cannot be called recursively, as it"
" is not RECURSIVE", csym->name, &c->loc);
t = FAILURE;
}
/* Switch off assumed size checking and do this again for certain kinds

11
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,14 @@
2008-11-30 Daniel Kraft <d@domob.eu>
PR fortran/37779
* gfortran.dg/recursive_check_1.f: Changed expected error message to
the more general new one.
* gfortran.dg/recursive_check_2.f90: Ditto.
* gfortran.dg/entry_18.f90: Ditto.
* gfortran.dg/recursive_check_4.f03: Do "the same" check also for
FUNCTIONS, as this is different in details from SUBROUTINES.
* gfortran.dg/recursive_check_6.f03: New test.
2008-11-30 Eric Botcazou <ebotcazou@adacore.com>
* g++.dg/opt/reload3.C: New test.

2
gcc/testsuite/gfortran.dg/entry_18.f90
View File

@ -27,7 +27,7 @@ subroutine subb( g )
end function
end interface
real :: x, y
call mysub( glocalb ) ! { dg-error "is recursive" }
call mysub( glocalb ) ! { dg-warning "Non-RECURSIVE" }
return
entry glocalb( x, y )
y = x

8
gcc/testsuite/gfortran.dg/recursive_check_1.f
View File

@ -1,17 +1,17 @@
! { dg-do compile }
! PR fortran/26551
SUBROUTINE SUB()
CALL SUB() ! { dg-error "cannot call itself, as it is not RECURSIVE" }
CALL SUB() ! { dg-error "is not RECURSIVE" }
END SUBROUTINE
FUNCTION FUNC() RESULT (FOO)
INTEGER FOO
FOO = FUNC() ! { dg-error "cannot call itself, as it is not RECURSIVE" }
FOO = FUNC() ! { dg-error "is not RECURSIVE" }
END FUNCTION
SUBROUTINE SUB2()
ENTRY ENT2()
CALL ENT2() ! { dg-error "is not declared as RECURSIVE" }
CALL ENT2() ! { dg-error "is not RECURSIVE" }
END SUBROUTINE
function func2()
@ -19,7 +19,7 @@
func2 = 42
return
entry c() result (foo)
foo = b() ! { dg-error "is not declared as RECURSIVE" }
foo = b() ! { dg-error "is not RECURSIVE" }
return
entry b() result (bar)
bar = 12

2
gcc/testsuite/gfortran.dg/recursive_check_2.f90
View File

@ -12,6 +12,6 @@
return
contains
function barbar ()
barbar = b () ! { dg-error "is not declared as RECURSIVE" }
barbar = b () ! { dg-error "is not RECURSIVE" }
end function barbar
end function

10
gcc/testsuite/gfortran.dg/recursive_check_4.f03
View File

@ -16,6 +16,16 @@ CONTAINS
procptr => test ! { dg-warning "Non-RECURSIVE" }
END SUBROUTINE test
INTEGER FUNCTION test2 () RESULT (x)
IMPLICIT NONE
PROCEDURE(test2), POINTER :: procptr
CALL bar (test2) ! { dg-warning "Non-RECURSIVE" }
procptr => test2 ! { dg-warning "Non-RECURSIVE" }
x = 1812
END FUNCTION test2
INTEGER FUNCTION func ()
! Using a result variable is ok of course!
func = 42 ! { dg-bogus "Non-RECURSIVE" }

66
gcc/testsuite/gfortran.dg/recursive_check_6.f03 Normal file
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@ -0,0 +1,66 @@
! { dg-do compile }
! PR fortran/37779
! Check that a call to a procedure's containing procedure counts as recursive
! and is rejected if the containing procedure is not RECURSIVE.
MODULE m
IMPLICIT NONE
CONTAINS
SUBROUTINE test_sub ()
CALL bar ()
CONTAINS
SUBROUTINE bar ()
IMPLICIT NONE
PROCEDURE(test_sub), POINTER :: procptr
CALL test_sub () ! { dg-error "not RECURSIVE" }
procptr => test_sub ! { dg-warning "Non-RECURSIVE" }
CALL foobar (test_sub) ! { dg-warning "Non-RECURSIVE" }
END SUBROUTINE bar
END SUBROUTINE test_sub
INTEGER FUNCTION test_func () RESULT (x)
x = bar ()
CONTAINS
INTEGER FUNCTION bar ()
IMPLICIT NONE
PROCEDURE(test_func), POINTER :: procptr
bar = test_func () ! { dg-error "not RECURSIVE" }
procptr => test_func ! { dg-warning "Non-RECURSIVE" }
CALL foobar (test_func) ! { dg-warning "Non-RECURSIVE" }
END FUNCTION bar
END FUNCTION test_func
SUBROUTINE sub_entries ()
ENTRY sub_entry_1 ()
ENTRY sub_entry_2 ()
CALL bar ()
CONTAINS
SUBROUTINE bar ()
CALL sub_entry_1 () ! { dg-error "is not RECURSIVE" }
END SUBROUTINE bar
END SUBROUTINE sub_entries
INTEGER FUNCTION func_entries () RESULT (x)
ENTRY func_entry_1 () RESULT (x)
ENTRY func_entry_2 () RESULT (x)
x = bar ()
CONTAINS
INTEGER FUNCTION bar ()
bar = func_entry_1 () ! { dg-error "is not RECURSIVE" }
END FUNCTION bar
END FUNCTION func_entries
SUBROUTINE main ()
CALL test_sub ()
CALL sub_entries ()
PRINT *, test_func (), func_entries ()
END SUBROUTINE main
END MODULE m
! { dg-final { cleanup-modules "m" } }