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