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Re: Fix more of C/fortran canonical type issues


> On Mon, 8 Jun 2015, Jan Hubicka wrote:
> 
> > > 
> > > I think we should instead work towards eliminating the get_alias_set
> > > langhook first.  The LTO langhook variant contains the same handling, btw,
> > > so just inline that into get_alias_set and see what remains?
> > 
> > I see, i completely missed existence of gimple_get_alias_set. It makes more
> > sense now.
> > 
> > Is moving everyting to alias.c realy a desirable thing? If non-C languages do
> > not have this rule, why we want to reduce the code quality when compiling
> > those?
> 
> Well, for consistency and for getting rid of one langhook ;)
:)
In a way this particular langhook makes sense to me - TBAA rules are language specific.
We also may with explicit streaming of the TBAA dag, like LLVM does.

Anyway, this is the updated patch fixing the Fortran's interoperability with
size_t and signed char.  I will send separate patch for the extra lto-symtab
warnings shortly.

I will be happy looking into the TYPE_CANONICAL (int) to be different from
TYPE_CANONICAL (unsigned int) if that seems desirable. There are two things that
needs to be solved - hash_canonical_type/gimple_canonical_types_compatible_p can't
use TYPE_CNAONICAL of subtypes in all cases (that is easy) and we will need some
way to recognize the conflict in lto-symtab other thanjust comparing TYPE_CANONICAL
to not warn when a variable is declared signed in Fortran unit and unsigned in C.

Bootstrapped/regtested ppc64le-linux.

	* lto/lto.c (hash_canonical_type): Do not hash TYPE_UNSIGNED
	of INTEGER_TYPE.
	* tree.c (gimple_canonical_types_compatible_p): Do not compare TYPE_UNSIGNED
	of INTEGER_TYPE.
	* gimple-expr.c (useless_type_conversion_p): Move INTEGER type handling
	ahead the canonical type lookup.

	* gfortran.dg/lto/bind_c-2_0.f90: New testcase
	* gfortran.dg/lto/bind_c-2_1.c: New testcase
	* gfortran.dg/lto/bind_c-3_0.f90: New testcase
	* gfortran.dg/lto/bind_c-3_1.c: New testcase
	* gfortran.dg/lto/bind_c-4_0.f90: New testcase
	* gfortran.dg/lto/bind_c-4_1.c: New testcase
Index: lto/lto.c
===================================================================
--- lto/lto.c	(revision 224252)
+++ lto/lto.c	(working copy)
@@ -298,6 +298,7 @@
 hash_canonical_type (tree type)
 {
   inchash::hash hstate;
+  enum tree_code code;
 
   /* We compute alias sets only for types that needs them.
      Be sure we do not recurse to something else as we can not hash incomplete
@@ -309,7 +310,8 @@
      smaller sets; when searching for existing matching types to merge,
      only existing types having the same features as the new type will be
      checked.  */
-  hstate.add_int (tree_code_for_canonical_type_merging (TREE_CODE (type)));
+  code = tree_code_for_canonical_type_merging (TREE_CODE (type));
+  hstate.add_int (code);
   hstate.add_int (TYPE_MODE (type));
 
   /* Incorporate common features of numerical types.  */
@@ -319,7 +321,14 @@
       || TREE_CODE (type) == OFFSET_TYPE
       || POINTER_TYPE_P (type))
     {
-      hstate.add_int (TYPE_UNSIGNED (type));
+      /* Some Fortran integer types are interoperable with C types regardless
+	 their signedness.  We need to ignore sign on these to make it
+	 possible for structure containing unsigned type to interoperate
+	 with structure containing signed type which is also required by
+	 the standard.  It is thus not enough to keep alias set of signed
+	 type same with alias set of unsigned type.  */
+      if (code != INTEGER_TYPE)
+        hstate.add_int (TYPE_UNSIGNED (type));
       hstate.add_int (TYPE_PRECISION (type));
     }
 
Index: tree.c
===================================================================
--- tree.c	(revision 224252)
+++ tree.c	(working copy)
@@ -12879,6 +12879,7 @@
 gimple_canonical_types_compatible_p (const_tree t1, const_tree t2,
 				     bool trust_type_canonical)
 {
+  enum tree_code code;
   /* Type variants should be same as the main variant.  When not doing sanity
      checking to verify this fact, go to main variants and save some work.  */
   if (trust_type_canonical)
@@ -12918,9 +12919,9 @@
       && trust_type_canonical)
     return TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2);
 
+  code = tree_code_for_canonical_type_merging (TREE_CODE (t1));
   /* Can't be the same type if the types don't have the same code.  */
-  if (tree_code_for_canonical_type_merging (TREE_CODE (t1))
-      != tree_code_for_canonical_type_merging (TREE_CODE (t2)))
+  if (code != tree_code_for_canonical_type_merging (TREE_CODE (t2)))
     return false;
 
   /* Qualifiers do not matter for canonical type comparison purposes.  */
@@ -12945,7 +12946,14 @@
     {
       /* Can't be the same type if they have different sign or precision.  */
       if (TYPE_PRECISION (t1) != TYPE_PRECISION (t2)
-	  || TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2))
+	  /* Some Fortran integer types are interoperable with C types
+	     regardless their signedness.  We need to ignore sign on these to
+	     make it possible for structure containing unsigned type to
+	     interoperate with structure containing signed type which is also
+	     required by the standard.  It is thus not enough to keep alias set
+	     of signed type same with alias set of unsigned type.  */
+	  || (code != INTEGER_TYPE
+	      && TYPE_UNSIGNED (t1) != TYPE_UNSIGNED (t2)))
 	return false;
 
       /* Fortran's C_SIGNED_CHAR is !TYPE_STRING_FLAG but needs to be
Index: testsuite/gfortran.dg/lto/bind_c-2_0.f90
===================================================================
--- testsuite/gfortran.dg/lto/bind_c-2_0.f90	(revision 0)
+++ testsuite/gfortran.dg/lto/bind_c-2_0.f90	(working copy)
@@ -0,0 +1,21 @@
+! { dg-lto-do run }
+! { dg-lto-options {{ -O3 -flto }} }
+! This testcase will abort if C_PTR is not interoperable with both int *
+! and float *
+module lto_type_merge_test
+  use, intrinsic :: iso_c_binding
+  implicit none
+
+  type, bind(c) :: MYFTYPE_1
+     integer(c_signed_char) :: chr
+     integer(c_signed_char) :: chrb
+  end type MYFTYPE_1
+
+  type(myftype_1), bind(c, name="myVar") :: myVar
+
+contains
+  subroutine types_test() bind(c)
+    myVar%chr = myVar%chrb
+  end subroutine types_test
+end module lto_type_merge_test
+
Index: testsuite/gfortran.dg/lto/bind_c-2_1.c
===================================================================
--- testsuite/gfortran.dg/lto/bind_c-2_1.c	(revision 0)
+++ testsuite/gfortran.dg/lto/bind_c-2_1.c	(working copy)
@@ -0,0 +1,36 @@
+#include <stdlib.h>
+/* interopse with myftype_1 */
+typedef struct {
+   unsigned char chr;
+   signed char chr2;
+} myctype_t;
+
+
+extern void abort(void);
+void types_test(void);
+/* declared in the fortran module */
+extern myctype_t myVar;
+
+int main(int argc, char **argv)
+{
+   myctype_t *cchr;
+   asm("":"=r"(cchr):"0"(&myVar));
+   cchr->chr = 1;
+   cchr->chr2 = 2;
+
+   types_test();
+
+   if(cchr->chr != 2)
+      abort();
+   if(cchr->chr2 != 2)
+      abort();
+   myVar.chr2 = 3;
+   types_test();
+
+   if(myVar.chr != 3)
+      abort();
+   if(myVar.chr2 != 3)
+      abort();
+   return 0;
+}
+
Index: testsuite/gfortran.dg/lto/bind_c-3_0.f90
===================================================================
--- testsuite/gfortran.dg/lto/bind_c-3_0.f90	(revision 0)
+++ testsuite/gfortran.dg/lto/bind_c-3_0.f90	(working copy)
@@ -0,0 +1,91 @@
+! { dg-lto-do run }
+! { dg-lto-options {{ -O3 -flto }} }
+! This testcase will abort if integer types are not interoperable.
+module lto_type_merge_test
+  use, intrinsic :: iso_c_binding
+  implicit none
+
+  type, bind(c) :: MYFTYPE_1
+    integer(c_int) :: val_int
+    integer(c_short) :: val_short
+    integer(c_long) :: val_long
+    integer(c_long_long) :: val_long_long
+    integer(c_size_t) :: val_size_t
+    integer(c_int8_t) :: val_int8_t
+    integer(c_int16_t) :: val_int16_t
+    integer(c_int32_t) :: val_int32_t
+    integer(c_int64_t) :: val_int64_t
+    integer(c_int_least8_t) :: val_intleast_8_t
+    integer(c_int_least16_t) :: val_intleast_16_t
+    integer(c_int_least32_t) :: val_intleast_32_t
+    integer(c_int_least64_t) :: val_intleast_64_t
+    integer(c_int_fast8_t) :: val_intfast_8_t
+    integer(c_int_fast16_t) :: val_intfast_16_t
+    integer(c_int_fast32_t) :: val_intfast_32_t
+    integer(c_int_fast64_t) :: val_intfast_64_t
+    integer(c_intmax_t) :: val_intmax_t
+    integer(c_intptr_t) :: val_intptr_t
+  end type MYFTYPE_1
+
+  type(myftype_1), bind(c, name="myVar") :: myVar
+
+contains
+  subroutine types_test1() bind(c)
+    myVar%val_int = 2
+  end subroutine types_test1
+  subroutine types_test2() bind(c)
+    myVar%val_short = 2
+  end subroutine types_test2
+  subroutine types_test3() bind(c)
+    myVar%val_long = 2
+  end subroutine types_test3
+  subroutine types_test4() bind(c)
+    myVar%val_long_long = 2
+  end subroutine types_test4
+  subroutine types_test5() bind(c)
+    myVar%val_size_t = 2
+  end subroutine types_test5
+  subroutine types_test6() bind(c)
+    myVar%val_int8_t = 2
+  end subroutine types_test6
+  subroutine types_test7() bind(c)
+    myVar%val_int16_t = 2
+  end subroutine types_test7
+  subroutine types_test8() bind(c)
+    myVar%val_int32_t = 2
+  end subroutine types_test8
+  subroutine types_test9() bind(c)
+    myVar%val_int64_t = 2
+  end subroutine types_test9
+  subroutine types_test10() bind(c)
+    myVar%val_intleast_8_t = 2
+  end subroutine types_test10
+  subroutine types_test11() bind(c)
+    myVar%val_intleast_16_t = 2
+  end subroutine types_test11
+  subroutine types_test12() bind(c)
+    myVar%val_intleast_32_t = 2
+  end subroutine types_test12
+  subroutine types_test13() bind(c)
+    myVar%val_intleast_64_t = 2
+  end subroutine types_test13
+  subroutine types_test14() bind(c)
+    myVar%val_intfast_8_t = 2
+  end subroutine types_test14
+  subroutine types_test15() bind(c)
+    myVar%val_intfast_16_t = 2
+  end subroutine types_test15
+  subroutine types_test16() bind(c)
+    myVar%val_intfast_32_t = 2
+  end subroutine types_test16
+  subroutine types_test17() bind(c)
+    myVar%val_intfast_64_t = 2
+  end subroutine types_test17
+  subroutine types_test18() bind(c)
+    myVar%val_intmax_t = 2
+  end subroutine types_test18
+  subroutine types_test19() bind(c)
+    myVar%val_intptr_t = 2
+  end subroutine types_test19
+end module lto_type_merge_test
+
Index: testsuite/gfortran.dg/lto/bind_c-3_1.c
===================================================================
--- testsuite/gfortran.dg/lto/bind_c-3_1.c	(revision 0)
+++ testsuite/gfortran.dg/lto/bind_c-3_1.c	(working copy)
@@ -0,0 +1,78 @@
+#include <stdlib.h>
+#include <stdint.h>
+/* interopse with myftype_1 */
+typedef struct {
+  int val1;
+  short int val2;
+  long int val3;
+  long long int val4;
+  size_t val5;
+  int8_t val6;
+  int16_t val7;
+  int32_t val8;
+  int64_t val9;
+  int_least8_t val10;
+  int_least16_t val11;
+  int_least32_t val12;
+  int_least64_t val13;
+  int_fast8_t val14;
+  int_fast16_t val15;
+  int_fast32_t val16;
+  int_fast64_t val17;
+  intmax_t val18;
+  intptr_t val19;
+} myctype_t;
+
+
+extern void abort(void);
+void types_test1(void);
+void types_test2(void);
+void types_test3(void);
+void types_test4(void);
+void types_test5(void);
+void types_test6(void);
+void types_test7(void);
+void types_test8(void);
+void types_test9(void);
+void types_test10(void);
+void types_test11(void);
+void types_test12(void);
+void types_test13(void);
+void types_test14(void);
+void types_test15(void);
+void types_test16(void);
+void types_test17(void);
+void types_test18(void);
+void types_test19(void);
+/* declared in the fortran module */
+extern myctype_t myVar;
+
+#define test(n)\
+  cchr->val##n = 1; types_test##n (); if (cchr->val##n != 2) abort ();
+
+int main(int argc, char **argv)
+{
+   myctype_t *cchr;
+   asm("":"=r"(cchr):"0"(&myVar));
+   test(1);
+   test(2);
+   test(3);
+   test(4);
+   test(5);
+   test(6);
+   test(7);
+   test(8);
+   test(9);
+   test(10);
+   test(11);
+   test(12);
+   test(13);
+   test(14);
+   test(15);
+   test(16);
+   test(17);
+   test(18);
+   test(19);
+   return 0;
+}
+
Index: testsuite/gfortran.dg/lto/bind_c-4_0.f90
===================================================================
--- testsuite/gfortran.dg/lto/bind_c-4_0.f90	(revision 0)
+++ testsuite/gfortran.dg/lto/bind_c-4_0.f90	(working copy)
@@ -0,0 +1,48 @@
+! { dg-lto-do run }
+! { dg-lto-options {{ -O3 -flto }} }
+! This testcase will abort if real/complex/boolean/character types are not interoperable
+module lto_type_merge_test
+  use, intrinsic :: iso_c_binding
+  implicit none
+
+  type, bind(c) :: MYFTYPE_1
+    real(c_float) :: val_1
+    real(c_double) :: val_2
+    real(c_long_double) :: val_3
+    complex(c_float_complex) :: val_4
+    complex(c_double_complex) :: val_5
+    complex(c_long_double_complex) :: val_6
+    logical(c_bool) :: val_7
+    !FIXME: Fortran define c_char as array of size 1.
+    !character(c_char) :: val_8
+  end type MYFTYPE_1
+
+  type(myftype_1), bind(c, name="myVar") :: myVar
+
+contains
+  subroutine types_test1() bind(c)
+    myVar%val_1 = 2
+  end subroutine types_test1
+  subroutine types_test2() bind(c)
+    myVar%val_2 = 2
+  end subroutine types_test2
+  subroutine types_test3() bind(c)
+    myVar%val_3 = 2
+  end subroutine types_test3
+  subroutine types_test4() bind(c)
+    myVar%val_4 = 2
+  end subroutine types_test4
+  subroutine types_test5() bind(c)
+    myVar%val_5 = 2
+  end subroutine types_test5
+  subroutine types_test6() bind(c)
+    myVar%val_6 = 2
+  end subroutine types_test6
+  subroutine types_test7() bind(c)
+    myVar%val_7 = myVar%val_7 .or. .not. myVar%val_7
+  end subroutine types_test7
+  !subroutine types_test8() bind(c)
+    !myVar%val_8 = "a"
+  !end subroutine types_test8
+end module lto_type_merge_test
+
Index: testsuite/gfortran.dg/lto/bind_c-4_1.c
===================================================================
--- testsuite/gfortran.dg/lto/bind_c-4_1.c	(revision 0)
+++ testsuite/gfortran.dg/lto/bind_c-4_1.c	(working copy)
@@ -0,0 +1,46 @@
+#include <stdlib.h>
+#include <stdint.h>
+/* interopse with myftype_1 */
+typedef struct {
+  float val1;
+  double val2;
+  long double val3;
+  float _Complex val4;
+  double _Complex val5;
+  long double _Complex val6;
+  _Bool val7;
+  /* FIXME: Fortran define c_char as array of size 1.
+     char val8;  */
+} myctype_t;
+
+
+extern void abort(void);
+void types_test1(void);
+void types_test2(void);
+void types_test3(void);
+void types_test4(void);
+void types_test5(void);
+void types_test6(void);
+void types_test7(void);
+void types_test8(void);
+/* declared in the fortran module */
+extern myctype_t myVar;
+
+#define test(n)\
+  cchr->val##n = 1; types_test##n (); if (cchr->val##n != 2) abort ();
+
+int main(int argc, char **argv)
+{
+   myctype_t *cchr;
+   asm("":"=r"(cchr):"0"(&myVar));
+   test(1);
+   test(2);
+   test(3);
+   test(4);
+   test(5);
+   test(6);
+   cchr->val7 = 0; types_test7 (); if (cchr->val7 != 1) abort ();
+   /*cchr->val8 = 0; types_test8 (); if (cchr->val8 != 'a') abort ();*/
+   return 0;
+}
+
Index: gimple-expr.c
===================================================================
--- gimple-expr.c	(revision 224250)
+++ gimple-expr.c	(working copy)
@@ -89,18 +89,6 @@
 	return false;
     }
 
-  /* From now on qualifiers on value types do not matter.  */
-  inner_type = TYPE_MAIN_VARIANT (inner_type);
-  outer_type = TYPE_MAIN_VARIANT (outer_type);
-
-  if (inner_type == outer_type)
-    return true;
-
-  /* If we know the canonical types, compare them.  */
-  if (TYPE_CANONICAL (inner_type)
-      && TYPE_CANONICAL (inner_type) == TYPE_CANONICAL (outer_type))
-    return true;
-
   /* Changes in machine mode are never useless conversions unless we
      deal with aggregate types in which case we defer to later checks.  */
   if (TYPE_MODE (inner_type) != TYPE_MODE (outer_type)
@@ -131,6 +119,18 @@
       return true;
     }
 
+  /* From now on qualifiers on value types do not matter.  */
+  inner_type = TYPE_MAIN_VARIANT (inner_type);
+  outer_type = TYPE_MAIN_VARIANT (outer_type);
+
+  if (inner_type == outer_type)
+    return true;
+
+  /* If we know the canonical types, compare them.  */
+  if (TYPE_CANONICAL (inner_type)
+      && TYPE_CANONICAL (inner_type) == TYPE_CANONICAL (outer_type))
+    return true;
+
   /* Scalar floating point types with the same mode are compatible.  */
   else if (SCALAR_FLOAT_TYPE_P (inner_type)
 	   && SCALAR_FLOAT_TYPE_P (outer_type))


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