1 //===-- FindBugs.cpp - Run Many Different Optimizations -------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines an interface that allows bugpoint to choose different
11 // combinations of optimizations to run on the selected input. Bugpoint will
12 // run these optimizations and record the success/failure of each. This way
13 // we can hopefully spot bugs in the optimizations.
15 //===----------------------------------------------------------------------===//
17 #include "BugDriver.h"
18 #include "ToolRunner.h"
19 #include "llvm/Pass.h"
20 #include "llvm/Support/raw_ostream.h"
25 /// runManyPasses - Take the specified pass list and create different
26 /// combinations of passes to compile the program with. Compile the program with
27 /// each set and mark test to see if it compiled correctly. If the passes
28 /// compiled correctly output nothing and rearrange the passes into a new order.
29 /// If the passes did not compile correctly, output the command required to
30 /// recreate the failure. This returns true if a compiler error is found.
32 bool BugDriver::runManyPasses(const std::vector<const PassInfo*> &AllPasses) {
33 setPassesToRun(AllPasses);
34 outs() << "Starting bug finding procedure...\n\n";
36 // Creating a reference output if necessary
37 if (initializeExecutionEnvironment()) return false;
40 if (ReferenceOutputFile.empty()) {
41 outs() << "Generating reference output from raw program: \n";
42 if (!createReferenceFile(Program))
51 // Step 1: Randomize the order of the optimizer passes.
53 std::random_shuffle(PassesToRun.begin(), PassesToRun.end());
56 // Step 2: Run optimizer passes on the program and check for success.
58 outs() << "Running selected passes on program to test for crash: ";
59 for(int i = 0, e = PassesToRun.size(); i != e; i++) {
60 outs() << "-" << PassesToRun[i]->getPassArgument( )<< " ";
64 if(runPasses(PassesToRun, Filename, false)) {
66 outs() << "Optimizer passes caused failure!\n\n";
67 debugOptimizerCrash();
70 outs() << "Combination " << num << " optimized successfully!\n";
74 // Step 3: Compile the optimized code.
76 outs() << "Running the code generator to test for a crash: ";
78 compileProgram(Program);
80 } catch (ToolExecutionError &TEE) {
81 outs() << "\n*** compileProgram threw an exception: ";
83 return debugCodeGeneratorCrash();
87 // Step 4: Run the program and compare its output to the reference
88 // output (created above).
90 outs() << "*** Checking if passes caused miscompliation:\n";
92 if (diffProgram(Filename, "", false)) {
93 outs() << "\n*** diffProgram returned true!\n";
94 debugMiscompilation();
97 outs() << "\n*** diff'd output matches!\n";
99 } catch (ToolExecutionError &TEE) {
100 errs() << TEE.what();
101 debugCodeGeneratorCrash();
105 sys::Path(Filename).eraseFromDisk();