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//===-- intrinsics.c ------------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/* Straight C for linking simplicity */
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <time.h>
#include "klee/klee.h"
#include "klee/ADT/KTest.h"
static KTest *testData = 0;
static unsigned testPosition = 0;
static unsigned char rand_byte(void) {
unsigned x = rand();
x ^= x >> 16;
x ^= x >> 8;
return x & 0xFF;
}
static void report_internal_error(const char *msg, ...)
__attribute__((format(printf, 1, 2)));
static void report_internal_error(const char *msg, ...) {
fprintf(stderr, "KLEE_RUN_TEST_ERROR: ");
va_list ap;
va_start(ap, msg);
vfprintf(stderr, msg, ap);
va_end(ap);
fprintf(stderr, "\n");
char *testErrorsNonFatal = getenv("KLEE_RUN_TEST_ERRORS_NON_FATAL");
if (testErrorsNonFatal) {
fprintf(stderr, "KLEE_RUN_TEST_ERROR: Forcing execution to continue\n");
} else {
exit(1);
}
}
void klee_make_symbolic(void *array, size_t nbytes, const char *name) {
if (!name)
name = "unnamed";
static int rand_init = -1;
if (rand_init == -1) {
if (getenv("KLEE_RANDOM")) {
struct timeval tv;
gettimeofday(&tv, 0);
rand_init = 1;
srand(tv.tv_sec ^ tv.tv_usec);
} else {
rand_init = 0;
}
}
if (rand_init) {
if (!strcmp(name, "syscall_a0")) {
unsigned long long *v = array;
assert(nbytes == 8);
*v = rand() % 69;
} else {
char *c = array;
size_t i;
for (i = 0; i < nbytes; i++)
c[i] = rand_byte();
}
return;
}
if (!testData) {
char tmp[256];
char *name = getenv("KTEST_FILE");
if (!name) {
fprintf(stdout, "KLEE-RUNTIME: KTEST_FILE not set, please enter .ktest path: ");
fflush(stdout);
name = tmp;
if (!fgets(tmp, sizeof tmp, stdin) || !strlen(tmp)) {
fprintf(stderr, "KLEE-RUNTIME: cannot replay, no KTEST_FILE or user input\n");
exit(1);
}
tmp[strlen(tmp) - 1] = '\0'; /* kill newline */
}
testData = kTest_fromFile(name);
if (!testData) {
fprintf(stderr, "KLEE-RUNTIME: unable to open .ktest file\n");
exit(1);
}
}
for (;; ++testPosition) {
if (testPosition >= testData->numObjects) {
report_internal_error("out of inputs. Will use zero if continuing.");
memset(array, 0, nbytes);
break;
} else {
KTestObject *o = &testData->objects[testPosition];
if (strcmp("model_version", o->name) == 0 &&
strcmp("model_version", name) != 0) {
// Skip over this KTestObject because we've hit
// `model_version` which is from the POSIX runtime
// and the caller didn't ask for it.
continue;
}
if (strcmp(name, o->name) != 0) {
report_internal_error(
"object name mismatch. Requesting \"%s\" but returning \"%s\"",
name, o->name);
}
memcpy(array, o->bytes, nbytes < o->numBytes ? nbytes : o->numBytes);
if (nbytes != o->numBytes) {
report_internal_error("object sizes differ. Expected %zu but got %u",
nbytes, o->numBytes);
if (o->numBytes < nbytes)
memset((char *)array + o->numBytes, 0, nbytes - o->numBytes);
}
++testPosition;
break;
}
}
}
void klee_silent_exit(int x) { exit(x); }
uintptr_t klee_choose(uintptr_t n) {
uintptr_t x;
klee_make_symbolic(&x, sizeof x, "klee_choose");
if (x >= n)
report_internal_error("klee_choose failure. max = %ld, got = %ld\n", n, x);
return x;
}
unsigned klee_is_replay() { return 1; }
void klee_assume(uintptr_t x) {
if (!x) {
report_internal_error("invalid klee_assume");
}
}
#define KLEE_GET_VALUE_STUB(suffix, type) \
type klee_get_value##suffix(type x) { return x; }
KLEE_GET_VALUE_STUB(f, float)
KLEE_GET_VALUE_STUB(d, double)
KLEE_GET_VALUE_STUB(l, long)
KLEE_GET_VALUE_STUB(ll, long long)
KLEE_GET_VALUE_STUB(_i32, int32_t)
KLEE_GET_VALUE_STUB(_i64, int64_t)
#undef KLEE_GET_VALUE_STUB
int klee_range(int begin, int end, const char *name) {
int x;
klee_make_symbolic(&x, sizeof x, name);
if (x < begin || x >= end) {
report_internal_error("invalid klee_range(%u,%u,%s) value, got: %u\n",
begin, end, name, x);
}
return x;
}
void klee_prefer_cex(void *object, uintptr_t condition) {}
void klee_abort() { abort(); }
void klee_print_expr(const char *msg, ...) {}
void klee_set_forking(unsigned enable) {}
void klee_open_merge() {}
void klee_close_merge() {}
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