blob: 4a7b8e306deb31ae86516229348ec089812ff224 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
/* { dg-additional-options "-fdiagnostics-text-art-charset=unicode" } */
#include <stdint.h>
#include <stdlib.h>
int32_t int_vla_write_element_symbolic_before_start (int32_t x, size_t n)
{
int32_t arr[n]; /* { dg-message "\\(1\\) capacity: 'n \\* 4' bytes" } */
arr[-2] = 42; /* { dg-warning "stack-based buffer underwrite" } */
}
/* { dg-begin-multiline-output "" }
┌───────────────────┐
│write of '(int) 42'│
└───────────────────┘
│
│
v
┌───────────────────┐ ┌────────────────────────────────┐
│before valid range │ │buffer allocated on stack at (1)│
└───────────────────┘ └────────────────────────────────┘
├─────────┬─────────┤├───────┬───────┤├───────────────┬────────────────┤
│ │ │
╭─────────┴───────────╮ ╭───┴───╮ ╭───────────┴───────────╮
│underwrite of 4 bytes│ │4 bytes│ │capacity: 'n * 4' bytes│
╰─────────────────────╯ ╰───────╯ ╰───────────────────────╯
{ dg-end-multiline-output "" } */
|
