Viewing file:  Wstringop-overflow-3.C (11.34 KB) -rw-r--r--
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/* PR middle-end/91458 - inconsistent warning for writing past the end
of an array member
{ dg-do compile }
{ dg-options "-O2 -Wall -Wno-array-bounds" } */
#define NOIPA __attribute__ ((noipa))
void sink (void*);
// Exercise flexible array members.
struct Ax
{
char n;
char a[]; // { dg-message "destination object 'Ax::a' of size 0" "note: flexarray" }
};
// Verify warning for a definition with no initializer.
Ax ax_;
NOIPA void gax_ ()
{
ax_.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
ax_.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
ax_.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that doesn't
// initialize the flexible array member.
Ax ax0 = { 0 };
NOIPA void gax0 ()
{
ax0.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
ax0.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
ax0.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that
// initializes the flexible array member to empty.
Ax ax0_ = { 0, { } };
NOIPA void gax0_ ()
{
ax0_.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
ax0_.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
ax0_.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for out-of-bounds accesses to a definition with
// an initializer.
Ax ax1 = { 1, { 0 } };
NOIPA void gax1 ()
{
ax1.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { target { vect_slp_v2qi_store_unalign } } }
ax1.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
ax1.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
Ax ax2 = { 2, { 1, 0 } };
NOIPA void gax2 ()
{
ax2.a[0] = 0;
ax2.a[1] = 0;
ax2.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify no warning for an unknown struct object.
NOIPA void gaxp (Ax *p)
{
p->a[0] = 0;
p->a[3] = 0;
p->a[9] = 0;
}
// Verify no warning for an extern struct object whose array may be
// initialized to any number of elements.
extern Ax axx;
NOIPA void gaxx ()
{
axx.a[0] = 0;
axx.a[3] = 0;
axx.a[9] = 0;
}
// Exercise zero-length array members.
struct A0
{
char n;
char a[0]; // { dg-message "destination object 'A0::a' of size 0" "note: trailing zero-length array" }
};
// Verify warning for a definition with no initializer.
A0 a0_;
NOIPA void ga0_ ()
{
a0_.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
a0_.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a0_.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that doesn't
// initialize the flexible array member.
A0 a00 = { 0 };
NOIPA void ga00 ()
{
a00.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
a00.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a00.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that
// initializes the flexible array member to empty.
A0 a00_ = { 0, { } };
NOIPA void ga00_ ()
{
a00_.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
a00_.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a00_.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// The following are rejected with
// error: too many initializers for 'char [0]'
// A0 a01 = { 1, { 0 } };
// A0 a02 = { 2, { 1, 0 } };
// Verify no warning for an unknown struct object.
NOIPA void ga0p (A0 *p)
{
p->a[0] = 0;
p->a[3] = 0;
p->a[9] = 0;
}
// Verify warning for an extern struct object which (unlike a true
// flexible array member) may not be initialized.
extern A0 a0x;
NOIPA void ga0x ()
{
a0x.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
a0x.a[3] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
a0x.a[9] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Exercise trailing one-element array members.
struct A1
{
char n;
char a[1]; // { dg-message "at offset \[1-2\] into destination object 'A1::a' of size 1" "note: trailing one-element array" }
};
// Verify warning for a definition with no initializer.
A1 a1_;
NOIPA void ga1_ ()
{
a1_.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { target { vect_slp_v2qi_store_unalign } } }
a1_.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a1_.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that doesn't
// initialize the one-element array member.
A1 a1__ = { 0 };
NOIPA void ga1__ ()
{
a1__.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { target { vect_slp_v2qi_store_unalign } } }
a1__.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a1__.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that
// initializes the one-element array member to empty.
A1 a1_0 = { 0, { } };
NOIPA void ga1_0_ ()
{
a1_0.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { target { vect_slp_v2qi_store_unalign } } }
a1_0.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a1_0.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that
// initializes the one-element array member.
A1 a1_1 = { 0, { 1 } };
NOIPA void ga1_1 ()
{
a1_1.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { target { vect_slp_v2qi_store_unalign } } }
a1_1.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a1_1.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify no warning for an unknown struct object.
NOIPA void ga1p (A1 *p)
{
p->a[0] = 0;
p->a[3] = 0;
p->a[9] = 0;
}
// Verify warning for an extern struct object. Similar to the zero-length
// array case, a one-element trailing array can be initialized to at most
// a single element.
extern A1 a1x;
NOIPA void ga1x ()
{
a1x.a[0] = 0;
a1x.a[3] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
a1x.a[9] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Exercise interior one-element array members (verify they're not
// treated as trailing.
struct A1i
{
char n;
char a[1]; // { dg-message "at offset \[1-2\] into destination object 'A1i::a' of size 1" "note: interior one-element array" }
char x;
};
// Verify warning for a definition with no initializer.
A1i a1i_;
NOIPA void ga1i_ ()
{
a1i_.a[0] = 0;
a1i_.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a1i_.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that doesn't
// initialize the one-element array member.
A1i a1i__ = { 0 };
NOIPA void ga1i__ ()
{
a1i__.a[0] = 0;
a1i__.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a1i__.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that
// initializes the one-element array member to empty.
A1 a1i_0 = { 0, { } };
NOIPA void ga1i_0_ ()
{
a1i_0.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { target { vect_slp_v2qi_store_unalign } } }
a1i_0.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a1i_0.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify warning for access to a definition with an initializer that
// initializes the one-element array member.
A1 a1i_1 = { 0, { 1 } };
NOIPA void ga1i_1 ()
{
a1i_1.a[0] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { target { vect_slp_v2qi_store_unalign } } }
a1i_1.a[1] = 0; // { dg-warning "\\\[-Wstringop-overflow" "" { xfail { vect_slp_v2qi_store_unalign } } }
a1i_1.a[2] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify no warning for an unknown struct object.
NOIPA void ga1ip (A1i *p)
{
p->a[0] = 0;
p->a[3] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
p->a[9] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify no warning for an extern struct object.
extern A1i a1ix;
NOIPA void ga1ix ()
{
a1ix.a[0] = 0;
a1ix.a[3] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
a1ix.a[9] = 0; // { dg-warning "\\\[-Wstringop-overflow" }
}
// Verify non-POD classes with flexible array members.
struct Bx
{
char n;
char a[]; // { dg-message "destination object 'Bx::a' of size 0" "note: flexarray class member" }
// Verify the warning for a constant.
Bx () { a[0] = 0; } // { dg-warning "\\\[-Wstringop-overflow" }
// And also for a non-constant. Regardless of the subscript, the array
// of the object in function gxi() below has a zero size.
Bx (int i) { a[i] = 0; } // { dg-warning "\\\[-Wstringop-overflow" }
};
NOIPA void gbx (void)
{
struct Bx bx;
sink (&bx);
}
NOIPA void gbxi (int i)
{
struct Bx bxi (i);
sink (&bxi);
}
struct B0
{
char n;
char a[0]; // { dg-message "destination object 'B0::a' of size 0" "note: zero-length trailing array class member" }
B0 () { a[0] = 0; } // { dg-warning "\\\[-Wstringop-overflow" }
};
NOIPA void gb0 (void)
{
struct B0 b0;
sink (&b0);
}
struct B1
{
char n;
char a[1]; // { dg-message "at offset 1 into destination object 'B1::a' of size 1" "note: one-element trailing array class member" }
B1 () { a[1] = 0; } // { dg-warning "\\\[-Wstringop-overflow" }
};
NOIPA void gb1 (void)
{
struct B1 b1;
sink (&b1);
}
struct B123
{
char a[123]; // { dg-message "at offset 123 into destination object 'B123::a' of size 123" "note: large trailing array class member" }
B123 () { a[123] = 0; } // { dg-warning "\\\[-Wstringop-overflow" }
};
NOIPA void gb123 (void)
{
struct B123 b123;
sink (&b123);
}
struct B234
{
char a[234]; // { dg-message "at offset 234 into destination object 'B234::a' of size 234" "note: large trailing array class member" }
B234 (int i) { a[i] = 0; } // { dg-warning "\\\[-Wstringop-overflow" }
};
NOIPA void g234 (void)
{
struct B234 b234 (234);
sink (&b234);
}
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