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Add fuzz testing of input programs.

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When the --fuzz-test command-line option is given, the input program
will be randomly perturbed by the lexer in an effort to trigger
assertions or crashes in the compiler (neither of which should ever
happen, even for malformed programs.)
This commit is contained in:
Matt Pharr
2012-02-06 13:59:14 -08:00
parent b7c5af7e64
commit 3efbc71a01
6 changed files with 366 additions and 105 deletions
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31
main.cpp
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@@ -41,6 +41,9 @@
#include "type.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef ISPC_IS_WINDOWS
#include <time.h>
#endif // ISPC_IS_WINDOWS
#include <llvm/Support/PrettyStackTrace.h>
#include <llvm/Support/Signals.h>
#if defined(LLVM_3_0) || defined(LLVM_3_0svn) || defined(LLVM_3_1svn)
@@ -97,6 +100,10 @@ usage(int ret) {
#endif // !LLVM_2_9
printf(" [--emit-llvm]\t\t\tEmit LLVM bitode file as output\n");
printf(" [--emit-obj]\t\t\tGenerate object file file as output (default)\n");
#if 0
printf(" [--fuzz-test]\t\t\tRandomly perturb program input to test error conditions\n");
printf(" [--fuzz-seed=<value>]\t\tSeed value for RNG for fuzz testing\n");
#endif
printf(" [-g]\t\t\t\tGenerate debugging information\n");
printf(" [--help]\t\t\t\tPrint help\n");
printf(" [-h <name>/--header-outfile=<name>]\tOutput filename for header\n");
@@ -144,7 +151,7 @@ usage(int ret) {
/** We take arguments from both the command line as well as from the
ISPC_ARGS environment variable. This function returns a new set of
arguments representing the ones from those two sources merged together.
*/
*/
static void lGetAllArgs(int Argc, char *Argv[], int &argc, char *argv[128]) {
// Copy over the command line arguments (passed in)
for (int i = 0; i < Argc; ++i)
@@ -272,6 +279,10 @@ int main(int Argc, char *Argv[]) {
ot = Module::Bitcode;
else if (!strcmp(argv[i], "--emit-obj"))
ot = Module::Object;
else if (!strcmp(argv[i], "--fuzz-test"))
g->enableFuzzTest = true;
else if (!strncmp(argv[i], "--fuzz-seed=", 12))
g->fuzzTestSeed = atoi(argv[i] + 12);
else if (!strcmp(argv[i], "--target")) {
// FIXME: should remove this way of specifying the target...
if (++i == argc) {
@@ -411,6 +422,24 @@ int main(int Argc, char *Argv[]) {
if (debugSet && !optSet)
g->opt.level = 0;
if (g->enableFuzzTest) {
if (g->fuzzTestSeed == -1) {
#ifdef ISPC_IS_WINDOWS
int seed = (unsigned)time(NULL);
#else
int seed = getpid();
#endif
g->fuzzTestSeed = seed;
Warning(SourcePos(), "Using seed %d for fuzz testing",
g->fuzzTestSeed);
}
#ifdef ISPC_IS_WINDOWS
srand(g->fuzzTestSeed);
#else
srand48(g->fuzzTestSeed);
#endif
}
if (outFileName == NULL && headerFileName == NULL)
Warning(SourcePos(), "No output file or header file name specified. "
"Program will be compiled and warnings/errors will "