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/* PR middle-end/92936 - missing warning on a past-the-end store to a PHI
Exercise warnings for writing into one of two or more allocated objects.
{ dg-do compile }
{ dg-options "-O2 -Wall -Wno-array-bounds -ftrack-macro-expansion=0" } */
#include "range.h"
#define INT_MAX __INT_MAX__
extern void* malloc (size_t);
extern void* memset (void*, int, size_t);
#define memset(d, c, n) sink (memset (d, c, n))
void sink (int, ...);
#define sink(...) sink (0, __VA_ARGS__)
volatile int cond1, cond2, x;
#define CHOOSE_MALLOC_2(n1, n2) \
(cond1 ? malloc (n1) : malloc (n2))
#define CHOOSE_MALLOC_3(n1, n2, n3) \
(cond1 < 0 ? malloc (n1) : 0 < cond1 ? malloc (n2) : malloc (n3))
void memset_malloc_2 (void)
{
{
char *p0_1 = CHOOSE_MALLOC_2 (0, 1);
memset (p0_1, 0, 0);
/* Writing more than the smallest destination should trigger a "may
write" warning if the access is unconditionally reachable from
the block where the pointer to either object is assigned. */
memset (p0_1, 0, 1);
memset (p0_1, 0, 2); // { dg-warning "memset' writing 2 bytes into a region of size 1 " }
memset (p0_1, 0, 9); // { dg-warning "memset' writing 9 bytes into a region of size 1 " }
}
{
char *p0_x = CHOOSE_MALLOC_2 (0, x);
memset (p0_x, 0, 0);
memset (p0_x, 0, 1);
memset (p0_x, 0, 2);
memset (p0_x, 0, 12345);
}
{
char *px_x = CHOOSE_MALLOC_2 (x, x);
memset (px_x, 0, 0);
memset (px_x, 0, 1);
memset (px_x, 0, 2);
memset (px_x, 0, 12345);
}
{
char *p3_5 = CHOOSE_MALLOC_2 (3, 5);
memset (p3_5, 0, 1);
memset (p3_5, 0, 3);
memset (p3_5, 0, 4);
memset (p3_5, 0, 5);
memset (p3_5, 0, 6); // { dg-warning "memset' writing 6 bytes into a region of size 5 " }
}
{
char *p5_3 = CHOOSE_MALLOC_2 (5, 3);
memset (p5_3, 0, 3);
memset (p5_3, 0, 4);
memset (p5_3, 0, 5);
memset (p5_3, 0, 6); // { dg-warning "memset' writing 6 bytes into a region of size 5 " }
}
{
char *px_3 = CHOOSE_MALLOC_2 (x, 3);
memset (px_3, 0, 1);
memset (px_3, 0, 3);
memset (px_3, 0, 4);
memset (px_3, 0, 1234);
}
{
char *p5_x = CHOOSE_MALLOC_2 (5, x);
memset (p5_x, 0, 1);
memset (p5_x, 0, 5);
memset (p5_x, 0, 6);
memset (p5_x, 0, 1234);
}
}
void memset_malloc_3 (void)
{
{
char *p0_1_2 = CHOOSE_MALLOC_3 (0, 1, 2);
memset (p0_1_2, 0, 0);
memset (p0_1_2, 0, 1);
memset (p0_1_2, 0, 2);
memset (p0_1_2, 0, 3); // { dg-warning "memset' writing 3 bytes into a region of size 2 " }
memset (p0_1_2, 0, 9); // { dg-warning "memset' writing 9 bytes into a region of size 2 " }
}
{
char *p0_2_x = CHOOSE_MALLOC_3 (0, 2, x);
memset (p0_2_x, 0, 0);
memset (p0_2_x, 0, 1);
memset (p0_2_x, 0, 3);
memset (p0_2_x, 0, 9);
}
{
char *p3_4_5 = CHOOSE_MALLOC_3 (3, 4, 5);
memset (p3_4_5, 0, 3);
memset (p3_4_5, 0, 4);
memset (p3_4_5, 0, 5);
memset (p3_4_5, 0, 6); // { dg-warning "memset' writing 6 bytes into a region of size 5 " }
}
{
char *p5_3_4 = CHOOSE_MALLOC_3 (5, 3, 4);
memset (p5_3_4, 0, 3);
memset (p5_3_4, 0, 4);
memset (p5_3_4, 0, 5);
memset (p5_3_4, 0, 6); // { dg-warning "memset' writing 6 bytes into a region of size 5 " }
}
{
char *p9_8_7 = CHOOSE_MALLOC_3 (9, 8, 7);
memset (p9_8_7, 0, 7);
memset (p9_8_7, 0, 8);
memset (p9_8_7, 0, 9);
memset (p9_8_7, 0, 10); // { dg-warning "memset' writing 10 bytes into a region of size 9 " }
}
}
/* Verify conditionally writing into one of two objects with the same
size. */
void memset_malloc_2_same_size (int i)
{
{
char a4_1[4], a4_2[4];
char *p4 = cond1 ? a4_1 : a4_2;
memset (p4, 0, 1);
memset (p4, 0, 2);
memset (p4, 0, 3);
memset (p4, 0, 4);
memset (p4, 0, 5); // { dg-warning "memset' writing 5 bytes into a region of size 4" }
}
{
char a4_1[4]; // { dg-message "destination object 'a4_1" "note" }
char a4_2[4]; // { dg-message "destination object 'a4_2" "note" }
char *p4 = cond1 ? a4_1 : a4_2;
char *p4_i = p4 + i;
memset (p4_i, 0, 5); // { dg-warning "memset' writing 5 bytes into a region of size 4" }
}
{
if (i < 1)
i = 1;
char a4_1[4]; // { dg-message "at offset \\\[1, 4] into destination object 'a4_1" "note" }
char a4_2[4]; // { dg-message "at offset \\\[1, 4] into destination object 'a4_2" "note" }
char *p4 = cond1 ? a4_1 : a4_2;
char *p4_i = p4 + i;
memset (p4_i, 0, 3);
memset (p4_i, 0, 4); // { dg-warning "memset' writing 4 bytes into a region of size 3 " }
}
}
void memset_malloc_2_off (void)
{
int i1 = SR (1, INT_MAX);
int i2 = SR (2, INT_MAX);
{
char a5[5]; // { dg-warning "at offset [1, 5] into destination object 'a5'
char a7[7]; // { dg-warning "at offset [2, 7] into destination object 'a7'
char *p5_p1 = a5 + i1;
char *p7_p2 = a7 + i2;
char *p5_7 = cond1 ? p5_p1 : p7_p2;
memset (p5_7, 0, 1);
memset (p5_7, 0, 2);
memset (p5_7, 0, 3);
memset (p5_7, 0, 4);
memset (p5_7, 0, 5);
memset (p5_7, 0, 6); // { dg-warning "memset' writing 6 bytes into a region of size 5 " }
}
int i3 = SR (3, INT_MAX);
{
char a5[5];
// { dg-message "at offset \\\[3, 5] into destination object 'a5'" "note" { target *-*-* } .-1 }
// { dg-message "at offset \\\[2, 5] into destination object 'a5'" "note" { target *-*-* } .-2 }
// { dg-message "at offset \\\[1, 5] into destination object 'a5'" "note" { target *-*-* } .-3 }
// { dg-message ": destination object 'a5'" "note" { target *-*-* } .-4 }
char a9[9];
// { dg-message "at offset \\\[4, 9] into destination object 'a9'" "note" { target *-*-* } .-1 }
// { dg-message "at offset \\\[3, 9] into destination object 'a9'" "note" { target *-*-* } .-2 }
// { dg-message "at offset \\\[2, 9] into destination object 'a9'" "note" { target *-*-* } .-3 }
// { dg-message ": destination object 'a9'" "note" { target *-*-* } .-4 }
char *p5_p2 = a5 + i2; // 3 bytes left
char *p9_p3 = a9 + i3; // 6 bytes left
char *p =
cond1 ? p5_p2 : p9_p3; // [3 - 6] bytes left
char *q = p + i1; // [2 - 5] bytes left
memset (q, 0, 1);
memset (q, 0, 2);
memset (q, 0, 3);
memset (q, 0, 4);
memset (q, 0, 5);
memset (q, 0, 6); // { dg-warning "memset' writing 6 bytes into a region of size 5" }
--q; // [3 - 6] bytes left
memset (q, 0, 1);
memset (q, 0, 2);
memset (q, 0, 3);
memset (q, 0, 4);
memset (q, 0, 5);
memset (q, 0, 6);
memset (q, 0, 7); // { dg-warning "memset' writing 7 bytes into a region of size 6" }
--q; // [4 - 7] bytes left
memset (q, 0, 1);
memset (q, 0, 2);
memset (q, 0, 3);
memset (q, 0, 4);
memset (q, 0, 5);
memset (q, 0, 6);
memset (q, 0, 7);
memset (q, 0, 8); // { dg-warning "memset' writing 8 bytes into a region of size 7" }
int m1_x = SR (-1, INT_MAX);
int m2_x = SR (-2, INT_MAX);
q += cond2 ? m1_x : m2_x; // [5 - 9] bytes left
memset (q, 0, 1);
memset (q, 0, 2);
memset (q, 0, 3);
memset (q, 0, 4);
memset (q, 0, 5);
memset (q, 0, 6);
memset (q, 0, 7);
memset (q, 0, 8);
memset (q, 0, 9);
memset (q, 0, 10); // { dg-warning "memset' writing 10 bytes into a region of size 9" }
}
}
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