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+//===-- FindBugs.cpp - Run Many Different Optimizations -------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines an interface that allows bugpoint to choose different
+// combinations of optimizations to run on the selected input. Bugpoint will
+// run these optimizations and record the success/failure of each. This way
+// we can hopefully spot bugs in the optimizations.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BugDriver.h"
+#include "ToolRunner.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <ctime>
+using namespace llvm;
+
+/// runManyPasses - Take the specified pass list and create different
+/// combinations of passes to compile the program with. Compile the program with
+/// each set and mark test to see if it compiled correctly. If the passes
+/// compiled correctly output nothing and rearrange the passes into a new order.
+/// If the passes did not compile correctly, output the command required to
+/// recreate the failure. This returns true if a compiler error is found.
+///
+bool BugDriver::runManyPasses(const std::vector<std::string> &AllPasses,
+ std::string &ErrMsg) {
+ setPassesToRun(AllPasses);
+ outs() << "Starting bug finding procedure...\n\n";
+
+ // Creating a reference output if necessary
+ if (initializeExecutionEnvironment()) return false;
+
+ outs() << "\n";
+ if (ReferenceOutputFile.empty()) {
+ outs() << "Generating reference output from raw program: \n";
+ if (!createReferenceFile(Program))
+ return false;
+ }
+
+ srand(time(NULL));
+
+ unsigned num = 1;
+ while(1) {
+ //
+ // Step 1: Randomize the order of the optimizer passes.
+ //
+ std::random_shuffle(PassesToRun.begin(), PassesToRun.end());
+
+ //
+ // Step 2: Run optimizer passes on the program and check for success.
+ //
+ outs() << "Running selected passes on program to test for crash: ";
+ for(int i = 0, e = PassesToRun.size(); i != e; i++) {
+ outs() << "-" << PassesToRun[i] << " ";
+ }
+
+ std::string Filename;
+ if(runPasses(Program, PassesToRun, Filename, false)) {
+ outs() << "\n";
+ outs() << "Optimizer passes caused failure!\n\n";
+ debugOptimizerCrash();
+ return true;
+ } else {
+ outs() << "Combination " << num << " optimized successfully!\n";
+ }
+
+ //
+ // Step 3: Compile the optimized code.
+ //
+ outs() << "Running the code generator to test for a crash: ";
+ std::string Error;
+ compileProgram(Program, &Error);
+ if (!Error.empty()) {
+ outs() << "\n*** compileProgram threw an exception: ";
+ outs() << Error;
+ return debugCodeGeneratorCrash(ErrMsg);
+ }
+ outs() << '\n';
+
+ //
+ // Step 4: Run the program and compare its output to the reference
+ // output (created above).
+ //
+ outs() << "*** Checking if passes caused miscompliation:\n";
+ bool Diff = diffProgram(Program, Filename, "", false, &Error);
+ if (Error.empty() && Diff) {
+ outs() << "\n*** diffProgram returned true!\n";
+ debugMiscompilation(&Error);
+ if (Error.empty())
+ return true;
+ }
+ if (!Error.empty()) {
+ errs() << Error;
+ debugCodeGeneratorCrash(ErrMsg);
+ return true;
+ }
+ outs() << "\n*** diff'd output matches!\n";
+
+ sys::Path(Filename).eraseFromDisk();
+
+ outs() << "\n\n";
+ num++;
+ } //end while
+
+ // Unreachable.
+}
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