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f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
114 lines
3.6 KiB
C++
114 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(NULL));
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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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