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// RUN: %llvmgcc %s -emit-llvm -O0 -c -o %t1.bc
// RUN: rm -rf %t.klee-out
// RUN: %klee --output-dir=%t.klee-out %t1.bc
// RUN: ls %t.klee-out/ | grep .err | wc -l | grep 2
// RUN: ls %t.klee-out/ | grep .ptr.err | wc -l | grep 2
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
unsigned klee_urange(unsigned start, unsigned end) {
unsigned x;
klee_make_symbolic(&x, sizeof x, "x");
if (x-start>=end-start) klee_silent_exit(0);
return x;
}
int *make_int(int i, int N) {
int *x = malloc(sizeof(*x) * N);
*x = i;
return x;
}
int main() {
int *buf[4];
buf[0] = malloc(sizeof(int)*4);
buf[1] = malloc(sizeof(int));
buf[2] = 0; // gets malloc'd
buf[3] = (int*) 0xdeadbeef; // boom
buf[0][0] = 10;
buf[0][1] = 42;
buf[1][0] = 20;
int i = klee_urange(0,4);
int new_size = 2 * sizeof(int) * klee_urange(0,2); // 0 or 8
// whee, party time, needs to:
// Fork if size == 0, in which case all buffers get free'd and
// we will crash in prints below.
// Fork if buf[s] == 0, in which case the buffer gets malloc'd (for s==2)
// Fork on other buffers (s in [0,1]) and do realloc
// for s==0 this is shrinking
// for s==1 this is growing
buf[i] = realloc(buf[i], new_size);
if (new_size == 0) {
assert(!buf[2]); // free(0) is a no-op
if (i==0) assert(!buf[0] && buf[1]);
if (i==1) assert(buf[0] && !buf[1]);
assert(i != 3); // we should have crashed on free of invalid
} else {
assert(new_size == sizeof(int)*2);
assert(buf[0][0] == 10);
assert(buf[0][1] == 42); // make sure copied
assert(buf[1][0] == 20);
if (i==1) { int x = buf[1][1]; } // should be safe
if (i==2) { int x = buf[2][0]; } // should be safe
assert(i != 3); // we should have crashed on realloc of invalid
}
return 0;
}
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