Viewing file:  Warray-bounds-22.c (4.24 KB) -rw-r--r--
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/* PR tree-optimization/82588 - missing -Warray-bounds on an excessively
large index
{ dg-do compile }
{ dg-require-effective-target alloca }
{ dg-options "-O2 -Warray-bounds -ftrack-macro-expansion=0" } */
#define SIZE_MAX __SIZE_MAX__
#define DIFF_MAX __PTRDIFF_MAX__
#define DIFF_MIN (-DIFF_MAX - 1)
typedef __PTRDIFF_TYPE__ ptrdiff_t;
typedef __SIZE_TYPE__ size_t;
static ptrdiff_t signed_value (void)
{
extern volatile ptrdiff_t signed_value_source;
return signed_value_source;
}
static ptrdiff_t signed_range (ptrdiff_t min, ptrdiff_t max)
{
ptrdiff_t val = signed_value ();
return val < min || max < val ? min : val;
}
typedef struct AX { int n; char ax[]; } AX;
typedef struct A1 { int i; char a1[1]; } A1;
typedef struct B { int i; struct A1 a1x[]; } B;
void sink (int, ...);
#define T(expr) sink (0, (expr))
void test_vla (unsigned m, unsigned n)
{
char vla1[m];
T (vla1[DIFF_MIN]); /* { dg-warning "array subscript -\[0-9\]+ is below array bounds" "vla" } */
T (vla1[-1]); /* { dg-warning "array subscript -1 is below array bounds" "vla" } */
T (vla1[0]);
T (vla1[1]);
T (vla1[m - 1]);
/* It would be nice to diagnose this. */
T (vla1[m]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "bug 82608" { xfail *-*-*} } */
T (vla1[DIFF_MAX - 1]);
T (vla1[DIFF_MAX]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "vla" } */
ptrdiff_t i = signed_range (DIFF_MAX - 1, DIFF_MAX);
T (vla1[i]);
char vla2[m][n];
T (vla2[0][DIFF_MIN]); /* { dg-warning "array subscript -\[0-9\]+ is below array bounds" "vla" } */
T (vla2[0][-1]); /* { dg-warning "array subscript -1 is below array bounds" "vla" } */
T (vla2[0][0]);
T (vla2[1][1]);
T (vla2[m - 1][n - 1]);
/* It would be nice to diagnose this. */
T (vla2[m][0]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "bug 82608" { xfail *-*-*} } */
T (vla2[m + 1][0]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "bug 82608" { xfail *-*-*} } */
T (vla2[0][n]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "bug 82608" { xfail *-*-*} } */
T (vla2[0][n + 1]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "bug 82608" { xfail *-*-*} } */
T (vla2[m][n]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "bug 82608" { xfail *-*-*} } */
T (vla2[m + 1][n + 1]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "bug 82608" { xfail *-*-*} } */
T (vla2[0][DIFF_MAX]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "vla" } */
T (vla2[DIFF_MAX][0]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "vla" { xfail *-*-* } } */
T (vla2[DIFF_MAX][DIFF_MAX]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "vla" } */
struct S256 { char a[256]; } vla3[m];
T (vla3[DIFF_MIN].a[0]); /* { dg-warning "array subscript -\[0-9\]+ is below array bounds" "vla" } */
T (vla3[-1].a[0]); /* { dg-warning "array subscript -1 is below array bounds" "vla" } */
T (vla3[0].a[0]);
T (vla3[1].a[0]);
T (vla3[m - 1].a[0]);
T (vla3[DIFF_MAX / 256 - 1].a[0]);
T (vla3[DIFF_MAX / 256].a[0]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "vla" } */
i = signed_range (DIFF_MAX / 256 - 1, DIFF_MAX);
T (vla3[i].a[0]);
i = signed_range (DIFF_MAX / 256, DIFF_MAX);
T (vla3[i].a[0]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "vla" } */
struct VLA { char vla[n]; } x;
T (x.vla[DIFF_MIN]); /* { dg-warning "array subscript -\[0-9\]+ is below array bounds" "vla" } */
T (x.vla[-1]); /* { dg-warning "array subscript -1 is below array bounds" "vla" } */
T (x.vla[0]);
T (x.vla[1]);
T (x.vla[n - 1]);
T (x.vla[DIFF_MAX - 1]);
T (x.vla[DIFF_MAX]); /* { dg-warning "array subscript \[0-9\]+ is above array bounds" "vla" } */
}
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