gcc/testsuite/gcc.dg/strlenopt-40.c

/* PR tree-optimization/83671 - fix for false positive reported by
   -Wstringop-overflow does not work with inlining
   { dg-do compile }
   { dg-options "-O1 -fdump-tree-optimized" } */

#include "strlenopt.h"

#define DIFF_MAX __PTRDIFF_MAX__

#define CAT(x, y) x ## y
#define CONCAT(x, y) CAT (x, y)
#define FAILNAME(name) CONCAT (call_ ## name ##_on_line_, __LINE__)

#define FAIL(name) do {				\
    extern void FAILNAME (name) (void);		\
    FAILNAME (name)();				\
  } while (0)

/* Macros to emit a call to funcation named
     call_in_{true,false}_branch_not_eliminated_on_line_NNN()
   for each call that's expected to be eliminated.  The dg-final
   scan-tree-dump-time directive at the bottom of the test verifies
   that no such call appears in output.  */
#define ELIM_TRUE(expr) \
  if (!(expr)) FAIL (in_true_branch_not_eliminated); else (void)0

#define ELIM_FALSE(expr)					\
  if (!!(expr)) FAIL (in_false_branch_not_eliminated); else (void)0

/* Macro to emit a call to a function named
     call_made_in_{true,false}_branch_on_line_NNN()
   for each call that's expected to be retained.  The dg-final
   scan-tree-dump-time directive at the bottom of the test verifies
   that the expected number of both kinds of calls appears in output
   (a pair for each line with the invocation of the KEEP() macro.  */
#define KEEP(expr)				\
  if (expr)					\
    FAIL (made_in_true_branch);			\
  else						\
    FAIL (made_in_false_branch)

typedef char A3[3], A5[5], A7[7], AX[];

typedef A3 A7_3[7];
typedef A3 AX_3[];
typedef A5 A7_5[7];
typedef A7 A5_7[5];

extern A7_3 a7_3;
extern A5_7 a5_7;
extern AX_3 ax_3;

extern A3 a3;
extern A7 a5;
extern A7 a7;
extern AX ax;

extern A3 *pa3;
extern A5 *pa5;
extern A7 *pa7;

extern A7_3 *pa7_3;
extern AX_3 *pax_3;
extern A5_7 *pa5_7;
extern A7_5 *pa7_5;

extern char *ptr;

struct MemArrays0 {
  A7_3 a7_3;
  A5_7 a5_7;
  char a3[3], a5[5], a0[0];
};
struct MemArraysX { char a3[3], a5[5], ax[]; };
struct MemArrays7 { char a3[3], a5[5], a7[7]; };

struct MemArrays0 ma0_3_5_7[3][5][7];

void elim_strings (int i)
{
  ELIM_TRUE (strlen (i < 0 ? "123" : "321") == 3);
  ELIM_FALSE (strlen (i < 0 ? "123" : "321") > 3);
  ELIM_FALSE (strlen (i < 0 ? "123" : "321") < 3);

  ELIM_TRUE (strlen (i < 0 ? "123" : "4321") >= 3);
  ELIM_FALSE (strlen (i < 0 ? "123" : "4321") > 4);
  ELIM_FALSE (strlen (i < 0 ? "123" : "4321") < 3);

  ELIM_TRUE (strlen (i < 0 ? "1234" : "321") >= 3);
  ELIM_FALSE (strlen (i < 0 ? "1234" : "321") < 3);
  ELIM_FALSE (strlen (i < 0 ? "1234" : "321") > 4);

  ELIM_TRUE (strlen (i < 0 ? "123" : "4321") <= 4);
  ELIM_TRUE (strlen (i < 0 ? "1234" : "321") <= 4);

  ELIM_TRUE (strlen (i < 0 ? "1" : "123456789") <= 9);
  ELIM_TRUE (strlen (i < 0 ? "1" : "123456789") >= 1);
}

/* Verify that strlen calls involving uninitialized global arrays
   of known size are eliminated when they appear in expressions
   that test for results that must be true.  */
void elim_global_arrays (int i)
{
  /* Verify that the expression involving the strlen call as well
     as whatever depends on it is eliminated  from the test output.
     All these expressions must be trivially true.  */
  ELIM_TRUE (strlen (a7_3[0]) < sizeof a7_3);
  ELIM_TRUE (strlen (a7_3[1]) < sizeof a7_3 - sizeof *a7_3);
  ELIM_TRUE (strlen (a7_3[6]) < sizeof a7_3 - 5 * sizeof *a7_3);
  ELIM_TRUE (strlen (a7_3[i]) < sizeof a7_3);

  ELIM_TRUE (strlen (a5_7[0]) < sizeof a5_7);
  ELIM_TRUE (strlen (a5_7[1]) < sizeof a5_7 - sizeof *a5_7);
  ELIM_TRUE (strlen (a5_7[4]) < sizeof a5_7 - 3 * sizeof *a5_7);
  ELIM_TRUE (strlen (a5_7[i]) < sizeof a5_7);

  /* Even when treating a multi-dimensional array as a single string
     the length must be less DIFF_MAX - (ax_3[i] - ax_3[0]) but GCC
     doesn't do that computation yet so avoid testing it.  */
  ELIM_TRUE (strlen (ax_3[0]) < DIFF_MAX);
  ELIM_TRUE (strlen (ax_3[1]) < DIFF_MAX);
  ELIM_TRUE (strlen (ax_3[9]) < DIFF_MAX);
  ELIM_TRUE (strlen (ax_3[i]) < DIFF_MAX);

  ELIM_TRUE (strlen (a3) < sizeof a3);
  ELIM_TRUE (strlen (a7) < sizeof a7);

  ELIM_TRUE (strlen (ax) != DIFF_MAX);
  /* ELIM_TRUE (strlen (ax) != DIFF_MAX - 1); */
  /* ELIM_TRUE (strlen (ax) < DIFF_MAX - 1); */
}

void elim_pointer_to_arrays (void)
{
  /* Unfortunately, GCC cannot be trusted not to misuse a pointer
     to a smaller array to point to an object of a bigger type so
     the strlen range optimization must assume each array pointer
     points effectively to an array of an unknown bound.  */
  ELIM_TRUE (strlen (*pa7) < DIFF_MAX);
  ELIM_TRUE (strlen (*pa5) < DIFF_MAX);
  ELIM_TRUE (strlen (*pa3) < DIFF_MAX);

  ELIM_TRUE (strlen ((*pa7_3)[0]) < DIFF_MAX);
  ELIM_TRUE (strlen ((*pa7_3)[1]) < DIFF_MAX);
  ELIM_TRUE (strlen ((*pa7_3)[6]) < DIFF_MAX);

  ELIM_TRUE (strlen ((*pax_3)[0]) < DIFF_MAX);
  ELIM_TRUE (strlen ((*pax_3)[1]) < DIFF_MAX);
  ELIM_TRUE (strlen ((*pax_3)[9]) < DIFF_MAX);

  ELIM_TRUE (strlen ((*pa5_7)[0]) < DIFF_MAX);
  ELIM_TRUE (strlen ((*pa5_7)[1]) < DIFF_MAX);
  ELIM_TRUE (strlen ((*pa5_7)[4]) < DIFF_MAX);
}

void elim_global_arrays_and_strings (int i)
{
  ELIM_TRUE (strlen (i < 0 ? a3 : "") < 3);
  ELIM_TRUE (strlen (i < 0 ? a3 : "1") < 3);
  ELIM_TRUE (strlen (i < 0 ? a3 : "12") < 3);
  ELIM_TRUE (strlen (i < 0 ? a3 : "123") < 4);

  ELIM_FALSE (strlen (i < 0 ? a3 : "") > 3);
  ELIM_FALSE (strlen (i < 0 ? a3 : "1") > 3);
  ELIM_FALSE (strlen (i < 0 ? a3 : "12") > 3);
  ELIM_FALSE (strlen (i < 0 ? a3 : "123") > 4);

  ELIM_TRUE (strlen (i < 0 ? a7 : "") < 7);
  ELIM_TRUE (strlen (i < 0 ? a7 : "1") < 7);
  ELIM_TRUE (strlen (i < 0 ? a7 : "12") < 7);
  ELIM_TRUE (strlen (i < 0 ? a7 : "123") < 7);
  ELIM_TRUE (strlen (i < 0 ? a7 : "123456") < 7);
  ELIM_TRUE (strlen (i < 0 ? a7 : "1234567") < 8);

  ELIM_FALSE (strlen (i < 0 ? a7 : "") > 6);
  ELIM_FALSE (strlen (i < 0 ? a7 : "1") > 6);
  ELIM_FALSE (strlen (i < 0 ? a7 : "12") > 6);
  ELIM_FALSE (strlen (i < 0 ? a7 : "123") > 6);
  ELIM_FALSE (strlen (i < 0 ? a7 : "123456") > 7);
  ELIM_FALSE (strlen (i < 0 ? a7 : "1234567") > 8);
}

void elim_member_arrays_obj (int i)
{
  ELIM_TRUE (strlen (ma0_3_5_7[0][0][0].a3) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[0][0][1].a3) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[0][0][2].a3) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[0][0][6].a3) < sizeof ma0_3_5_7);

  ELIM_TRUE (strlen (ma0_3_5_7[1][0][0].a3) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[2][0][1].a3) < sizeof ma0_3_5_7);

  ELIM_TRUE (strlen (ma0_3_5_7[1][1][0].a3) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[2][4][6].a3) < sizeof ma0_3_5_7);

  ELIM_TRUE (strlen (ma0_3_5_7[0][0][0].a5) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[0][0][1].a5) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[0][0][2].a5) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[0][0][6].a5) < sizeof ma0_3_5_7);

  ELIM_TRUE (strlen (ma0_3_5_7[1][0][0].a5) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[2][0][1].a5) < sizeof ma0_3_5_7);

  ELIM_TRUE (strlen (ma0_3_5_7[1][1][0].a5) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[2][4][6].a5) < sizeof ma0_3_5_7);

  ELIM_TRUE (strlen (ma0_3_5_7[0][0][0].a7_3[0]) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[2][4][6].a7_3[2]) < sizeof ma0_3_5_7);

  ELIM_TRUE (strlen (ma0_3_5_7[0][0][0].a5_7[0]) < sizeof ma0_3_5_7);
  ELIM_TRUE (strlen (ma0_3_5_7[2][4][6].a5_7[4]) < sizeof ma0_3_5_7);
}


#line 1000

/* Verify that strlen calls involving uninitialized global arrays
   of unknown size are not eliminated when they appear in expressions
   that test for results that need not be true.  */
void keep_global_arrays (int i)
{
  KEEP (strlen (a7_3[0]) < 2);
  KEEP (strlen (a7_3[1]) < 2);
  KEEP (strlen (a7_3[6]) < 2);
  KEEP (strlen (a7_3[i]) < 2);

  KEEP (strlen (a5_7[0]) < 6);
  KEEP (strlen (a5_7[1]) < 6);
  KEEP (strlen (a5_7[4]) < 6);
  KEEP (strlen (a5_7[i]) < 6);

  /* Verify also that tests (and strlen calls) are not eliminated
     for results greater than what would the size of the innermost
     array suggest might be possible (in case the element array is
     not nul-terminated), even though such calls are undefined.  */
  KEEP (strlen (a5_7[0]) > sizeof a5_7 - 2);
  KEEP (strlen (a5_7[1]) > sizeof a5_7 - sizeof a5_7[1] - 2);
  KEEP (strlen (a5_7[i]) > sizeof a5_7 - 2);

  KEEP (strlen (ax_3[0]) < 2);
  KEEP (strlen (ax_3[1]) < 2);
  KEEP (strlen (ax_3[2]) < 2);
  KEEP (strlen (ax_3[i]) < 2);

  /* Here again, verify that the ax_3 matrix is treated essentially
     as a flat array of unknown bound for the benefit of all the
     undefined code out there that might rely on it.  */
  KEEP (strlen (ax_3[0]) > 3);
  KEEP (strlen (ax_3[1]) > 9);
  KEEP (strlen (ax_3[2]) > 99);
  KEEP (strlen (ax_3[i]) > 999);

  KEEP (strlen (a3) < 2);
  KEEP (strlen (a7) < 6);

  KEEP (strlen (a3 + i) < 2);
  KEEP (strlen (a7 + i) < 2);

  /* The length of an array of unknown size may be as large as
     DIFF_MAX - 2.  */
  KEEP (strlen (ax) != DIFF_MAX - 2);
  KEEP (strlen (ax) < DIFF_MAX - 2);
  KEEP (strlen (ax) < 999);
  KEEP (strlen (ax) < 1);
}

void keep_pointer_to_arrays (int i)
{
  KEEP (strlen (*pa7) < 6);
  KEEP (strlen (*pa5) < 4);
  KEEP (strlen (*pa3) < 2);

  /* Since GCC cannot be trusted not to misuse a pointer to a smaller
     array to point to an object of a larger type verify that the bound
     in a pointer to an array of a known bound isn't relied on for
     the strlen range optimization.  If GCC is fixed to avoid these
     misuses these tests can be removed.  */
  KEEP (strlen (*pa7) > sizeof *pa7);
  KEEP (strlen (*pa5) > sizeof *pa5);
  KEEP (strlen (*pa3) > sizeof *pa3);

  KEEP (strlen ((*pa7_3)[0]) < 2);
  KEEP (strlen ((*pa7_3)[1]) < 2);
  KEEP (strlen ((*pa7_3)[6]) < 2);
  KEEP (strlen ((*pa7_3)[i]) < 2);

  /* Same as above.  */
  KEEP (strlen ((*pa7_3)[0]) > sizeof *pa7_3);
  KEEP (strlen ((*pa7_3)[i]) > sizeof *pa7_3);

  KEEP (strlen ((*pax_3)[0]) < 2);
  KEEP (strlen ((*pax_3)[1]) < 2);
  KEEP (strlen ((*pax_3)[9]) < 2);
  KEEP (strlen ((*pax_3)[i]) < 2);

  /* Same as above.  */
  KEEP (strlen ((*pax_3)[0]) > 3);
  KEEP (strlen ((*pax_3)[i]) > 333);

  KEEP (strlen ((*pa5_7)[0]) < 6);
  KEEP (strlen ((*pa5_7)[1]) < 6);
  KEEP (strlen ((*pa5_7)[4]) < 6);
  KEEP (strlen ((*pa5_7)[i]) < 6);

  /* Same as above.  */
  KEEP (strlen ((*pa5_7)[0]) > sizeof *pa5_7);
  KEEP (strlen ((*pa5_7)[i]) > sizeof *pa5_7);
 }

void keep_global_arrays_and_strings (int i)
{
  KEEP (strlen (i < 0 ? a3 : "") < 2);
  KEEP (strlen (i < 0 ? a3 : "1") < 2);
  KEEP (strlen (i < 0 ? a3 : "12") < 2);
  KEEP (strlen (i < 0 ? a3 : "123") < 3);

  KEEP (strlen (i < 0 ? a7 : "") < 5);
  KEEP (strlen (i < 0 ? a7 : "1") < 5);
  KEEP (strlen (i < 0 ? a7 : "12") < 5);
  KEEP (strlen (i < 0 ? a7 : "123") < 5);
  KEEP (strlen (i < 0 ? a7 : "123456") < 6);
  KEEP (strlen (i < 0 ? a7 : "1234567") < 6);

  /* Verify that a matrix is treated as a flat array even in a conditional
     expression (i.e., don't assume that a7_3[0] is nul-terminated, even
     though calling strlen() on such an array is undefined).  */
  KEEP (strlen (i < 0 ? a7_3[0] : "") > 7);
  KEEP (strlen (i < 0 ? a7_3[i] : "") > 7);
}

void keep_member_arrays_obj (int i)
{
  KEEP (strlen (ma0_3_5_7[0][0][0].a3) < 2);
  KEEP (strlen (ma0_3_5_7[0][0][1].a3) < 2);
  KEEP (strlen (ma0_3_5_7[0][0][2].a3) < 2);
  KEEP (strlen (ma0_3_5_7[0][0][6].a3) < 2);

  KEEP (strlen (ma0_3_5_7[1][0][0].a3) < 2);
  KEEP (strlen (ma0_3_5_7[2][0][1].a3) < 2);

  KEEP (strlen (ma0_3_5_7[1][1][0].a3) < 2);
  KEEP (strlen (ma0_3_5_7[2][4][6].a3) < 2);

  KEEP (strlen (ma0_3_5_7[0][0][0].a5) < 4);
  KEEP (strlen (ma0_3_5_7[0][0][1].a5) < 4);
  KEEP (strlen (ma0_3_5_7[0][0][2].a5) < 4);
  KEEP (strlen (ma0_3_5_7[0][0][6].a5) < 4);

  KEEP (strlen (ma0_3_5_7[1][0][0].a5) < 4);
  KEEP (strlen (ma0_3_5_7[2][0][1].a5) < 4);

  KEEP (strlen (ma0_3_5_7[1][1][0].a5) < 4);
  KEEP (strlen (ma0_3_5_7[2][4][6].a5) < 4);

  KEEP (strlen (ma0_3_5_7[0][0][0].a7_3[0]) < 2);
  KEEP (strlen (ma0_3_5_7[2][4][6].a7_3[2]) < 2);

  KEEP (strlen (ma0_3_5_7[0][0][0].a5_7[0]) < 6);
  KEEP (strlen (ma0_3_5_7[2][4][6].a5_7[4]) < 6);

  /* Again, verify that the .a3 array isn't assumed to necessarily
     be nul-terminated.  */
  KEEP (strlen (ma0_3_5_7[0][0][0].a3) > 2);
  KEEP (strlen (ma0_3_5_7[0][0][6].a3) > 2);
  KEEP (strlen (ma0_3_5_7[0][0][i].a3) > 2);
}

void keep_member_arrays_ptr (struct MemArrays0 *ma0,
			     struct MemArraysX *max,
			     struct MemArrays7 *ma7,
			     int i)
{
  KEEP (strlen (ma0->a7_3[0]) > 0);
  KEEP (strlen (ma0->a7_3[0]) < 2);
  KEEP (strlen (ma0->a7_3[1]) < 2);
  KEEP (strlen (ma0->a7_3[6]) < 2);
  KEEP (strlen (ma0->a7_3[6]) < 2);
  KEEP (strlen (ma0->a7_3[i]) > 0);
  KEEP (strlen (ma0->a7_3[i]) < 2);
  KEEP (strlen (ma0->a7_3[i]) < 2);

  /* Again, verify that the member array isn't assumed to necessarily
     be nul-terminated.  */
  KEEP (strlen (ma0->a7_3[0]) > sizeof ma0->a7_3);
  KEEP (strlen (ma0->a7_3[i]) > sizeof ma0->a7_3);

  KEEP (strlen (ma0->a5_7[0]) < 5);
  KEEP (strlen (ma0[0].a5_7[0]) < 5);
  KEEP (strlen (ma0[1].a5_7[0]) < 5);
  KEEP (strlen (ma0[9].a5_7[0]) < 5);
  KEEP (strlen (ma0[9].a5_7[4]) < 5);
  KEEP (strlen (ma0[i].a5_7[4]) < 5);
  KEEP (strlen (ma0[i].a5_7[i]) < 5);

  /* Same as above.  */
  KEEP (strlen (ma0[i].a5_7[i]) > sizeof ma0[i].a5_7);

  KEEP (strlen (ma0->a0) < DIFF_MAX - 2);
  KEEP (strlen (ma0->a0) < 999);
  KEEP (strlen (ma0->a0) < 1);

  KEEP (strlen (max->ax) < DIFF_MAX - 2);
  KEEP (strlen (max->ax) < 999);
  KEEP (strlen (max->ax) < 1);

  KEEP (strlen (ma7->a7) < DIFF_MAX - 2);
  KEEP (strlen (ma7->a7) < 999);
  KEEP (strlen (ma7->a7) < 1);
}

void keep_pointers (const char *s)
{
  KEEP (strlen (ptr) < DIFF_MAX - 2);
  KEEP (strlen (ptr) < 999);
  KEEP (strlen (ptr) < 1);

  KEEP (strlen (s) < DIFF_MAX - 2);
  KEEP (strlen (s) < 999);
  KEEP (strlen (s) < 1);
}


/* { dg-final { scan-tree-dump-times "call_in_true_branch_not_eliminated_" 0 "optimized" } }
   { dg-final { scan-tree-dump-times "call_in_false_branch_not_eliminated_" 0 "optimized" } }

   { dg-final { scan-tree-dump-times "call_made_in_true_branch_on_line_1\[0-9\]\[0-9\]\[0-9\]" 119 "optimized" } }
   { dg-final { scan-tree-dump-times "call_made_in_false_branch_on_line_1\[0-9\]\[0-9\]\[0-9\]" 119 "optimized" } } */