Commit 5e679697 authored by Daniel Liew's avatar Daniel Liew
Browse files

Fixed bug where divide by zero bugs would only be detected once in a program

even if there were many divide by zero bugs.

The fix basically inlines all function calls to klee_div_zero_check()
so that each call to klee_report_error() is a unique instruction
for each instrumentation of a divide operation.

It also seems that inlining the call "magically" fixed the debug information
(file and line number) of the instruction so that the debug information on the
inlined instructions matches that of the instrumented division instruction.

Note that the command line option -emit-all-errors could be used to
workaround the bug fixed in this commit.
parent e2201d62
......@@ -43,6 +43,10 @@
#include "llvm/Target/TargetData.h"
#include "llvm/Transforms/Scalar.h"
#include <llvm/Transforms/Utils/Cloning.h>
#include <llvm/Support/InstIterator.h>
#include <llvm/Support/Debug.h>
#include <sstream>
#include <fstream>
#include <string>
......@@ -311,6 +315,52 @@ static void forceImport(Module *m, const char *name, LLVM_TYPE_Q Type *retType,
/// This function will take try to inline all calls to \p functionName
/// in the module \p module .
/// It is intended that this function be used for inling calls to
/// check functions like <tt>klee_div_zero_check()</tt>
static void inlineChecks(Module *module, const char * functionName) {
std::vector<CallInst*> checkCalls;
Function* runtimeCheckCall = module->getFunction(functionName);
if (runtimeCheckCall == 0)
DEBUG( klee_warning("Failed to inline %s because no calls were made to it in module", functionName) );
// Iterate through instructions in module and collect all
// call instructions to "functionName" that we care about.
for (Module::iterator f = module->begin(), fe = module->end(); f != fe; ++f) {
for (inst_iterator i=inst_begin(f), ie = inst_end(f); i != ie; ++i) {
if ( CallInst* ci = dyn_cast<CallInst>(&*i) )
if ( ci->getCalledFunction() == runtimeCheckCall)
unsigned int successCount=0;
unsigned int failCount=0;
InlineFunctionInfo IFI(0,0);
for ( std::vector<CallInst*>::iterator ci = checkCalls.begin(),
cie = checkCalls.end();
ci != cie; ++ci)
// Try to inline the function
if (InlineFunction(*ci,IFI))
klee_warning("Failed to inline function %s", functionName);
DEBUG( klee_message("Tried to inline calls to %s. %u successes, %u failures",functionName, successCount, failCount) );
void KModule::prepare(const Interpreter::ModuleOptions &opts,
InterpreterHandler *ih,
InstructionInfoTable &infos) {
......@@ -415,6 +465,17 @@ void KModule::prepare(const Interpreter::ModuleOptions &opts,
module = linkWithLibrary(module, path.c_str());
/* In order for KLEE to report ALL errors at instrumented
* locations the instrumentation call (e.g. "klee_div_zero_check")
* must be inlined. Otherwise one of the instructions in the
* instrumentation function will be used as the the location of
* the error which means that the error cannot be recorded again
* ( unless -emit-all-errors is used).
if (opts.CheckDivZero)
inlineChecks(module, "klee_div_zero_check");
// Needs to happen after linking (since ctors/dtors can be modified)
// and optimization (since global optimization can rewrite lists).
// RUN: %llvmgcc -emit-llvm -c -g -O0 %s -o %t.bc
// RUN: %klee -check-div-zero -emit-all-errors=0 %t.bc 2> %t.log
// RUN: grep "completed paths = 3" %t.log
// RUN: grep "generated tests = 3" %t.log
// RUN: grep "consecutive_divide_by_zero.c:24: divide by zero" %t.log
// RUN: grep "consecutive_divide_by_zero.c:27: divide by zero" %t.log
/* This test case captures a bug where two distinct division
* by zero errors are treated as the same error and so
* only one test case is generated EVEN IF THERE ARE MULTIPLE
int main()
unsigned int a=15;
unsigned int b=15;
volatile unsigned int d1;
volatile unsigned int d2;
klee_make_symbolic(&d1, sizeof(d1),"divisor1");
klee_make_symbolic(&d2, sizeof(d2),"divisor2");
// deliberate division by zero possible
unsigned int result1 = a / d1;
// another deliberate division by zero possible
unsigned int result2 = b / d2;
return 0;
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