1 files changed, 260 insertions, 0 deletions
diff --git a/llvm/tools/bugpoint/BugDriver.cpp b/llvm/tools/bugpoint/BugDriver.cpp
new file mode 100644
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+++ b/llvm/tools/bugpoint/BugDriver.cpp
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+//===- BugDriver.cpp - Top-Level BugPoint class implementation ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This class contains all of the shared state and information that is used by
+// the BugPoint tool to track down errors in optimizations.  This class is the
+// main driver class that invokes all sub-functionality.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BugDriver.h"
+#include "ToolRunner.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/IRReader/IRReader.h"
+#include "llvm/Linker/Linker.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/raw_ostream.h"
+#include <memory>
+using namespace llvm;
+
+namespace llvm {
+Triple TargetTriple;
+}
+
+DiscardTemp::~DiscardTemp() {
+  if (SaveTemps) {
+    if (Error E = File.keep())
+      errs() << "Failed to keep temp file " << toString(std::move(E)) << '\n';
+    return;
+  }
+  if (Error E = File.discard())
+    errs() << "Failed to delete temp file " << toString(std::move(E)) << '\n';
+}
+
+// Anonymous namespace to define command line options for debugging.
+//
+namespace {
+// Output - The user can specify a file containing the expected output of the
+// program.  If this filename is set, it is used as the reference diff source,
+// otherwise the raw input run through an interpreter is used as the reference
+// source.
+//
+cl::opt<std::string> OutputFile("output",
+                                cl::desc("Specify a reference program output "
+                                         "(for miscompilation detection)"));
+}
+
+/// If we reduce or update the program somehow, call this method to update
+/// bugdriver with it.  This deletes the old module and sets the specified one
+/// as the current program.
+void BugDriver::setNewProgram(std::unique_ptr<Module> M) {
+  Program = std::move(M);
+}
+
+/// getPassesString - Turn a list of passes into a string which indicates the
+/// command line options that must be passed to add the passes.
+///
+std::string llvm::getPassesString(const std::vector<std::string> &Passes) {
+  std::string Result;
+  for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
+    if (i)
+      Result += " ";
+    Result += "-";
+    Result += Passes[i];
+  }
+  return Result;
+}
+
+BugDriver::BugDriver(const char *toolname, bool find_bugs, unsigned timeout,
+                     unsigned memlimit, bool use_valgrind, LLVMContext &ctxt)
+    : Context(ctxt), ToolName(toolname), ReferenceOutputFile(OutputFile),
+      Program(nullptr), Interpreter(nullptr), SafeInterpreter(nullptr),
+      cc(nullptr), run_find_bugs(find_bugs), Timeout(timeout),
+      MemoryLimit(memlimit), UseValgrind(use_valgrind) {}
+
+BugDriver::~BugDriver() {
+  if (Interpreter != SafeInterpreter)
+    delete Interpreter;
+  delete SafeInterpreter;
+  delete cc;
+}
+
+std::unique_ptr<Module> llvm::parseInputFile(StringRef Filename,
+                                             LLVMContext &Ctxt) {
+  SMDiagnostic Err;
+  std::unique_ptr<Module> Result = parseIRFile(Filename, Err, Ctxt);
+  if (!Result) {
+    Err.print("bugpoint", errs());
+    return Result;
+  }
+
+  if (verifyModule(*Result, &errs())) {
+    errs() << "bugpoint: " << Filename << ": error: input module is broken!\n";
+    return std::unique_ptr<Module>();
+  }
+
+  // If we don't have an override triple, use the first one to configure
+  // bugpoint, or use the host triple if none provided.
+  if (TargetTriple.getTriple().empty()) {
+    Triple TheTriple(Result->getTargetTriple());
+
+    if (TheTriple.getTriple().empty())
+      TheTriple.setTriple(sys::getDefaultTargetTriple());
+
+    TargetTriple.setTriple(TheTriple.getTriple());
+  }
+
+  Result->setTargetTriple(TargetTriple.getTriple()); // override the triple
+  return Result;
+}
+
+std::unique_ptr<Module> BugDriver::swapProgramIn(std::unique_ptr<Module> M) {
+  std::unique_ptr<Module> OldProgram = std::move(Program);
+  Program = std::move(M);
+  return OldProgram;
+}
+
+// This method takes the specified list of LLVM input files, attempts to load
+// them, either as assembly or bitcode, then link them together. It returns
+// true on failure (if, for example, an input bitcode file could not be
+// parsed), and false on success.
+//
+bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
+  assert(!Program && "Cannot call addSources multiple times!");
+  assert(!Filenames.empty() && "Must specify at least on input filename!");
+
+  // Load the first input file.
+  Program = parseInputFile(Filenames[0], Context);
+  if (!Program)
+    return true;
+
+  outs() << "Read input file      : '" << Filenames[0] << "'\n";
+
+  for (unsigned i = 1, e = Filenames.size(); i != e; ++i) {
+    std::unique_ptr<Module> M = parseInputFile(Filenames[i], Context);
+    if (!M.get())
+      return true;
+
+    outs() << "Linking in input file: '" << Filenames[i] << "'\n";
+    if (Linker::linkModules(*Program, std::move(M)))
+      return true;
+  }
+
+  outs() << "*** All input ok\n";
+
+  // All input files read successfully!
+  return false;
+}
+
+/// run - The top level method that is invoked after all of the instance
+/// variables are set up from command line arguments.
+///
+Error BugDriver::run() {
+  if (run_find_bugs) {
+    // Rearrange the passes and apply them to the program. Repeat this process
+    // until the user kills the program or we find a bug.
+    return runManyPasses(PassesToRun);
+  }
+
+  // If we're not running as a child, the first thing that we must do is
+  // determine what the problem is. Does the optimization series crash the
+  // compiler, or does it produce illegal code?  We make the top-level
+  // decision by trying to run all of the passes on the input program,
+  // which should generate a bitcode file.  If it does generate a bitcode
+  // file, then we know the compiler didn't crash, so try to diagnose a
+  // miscompilation.
+  if (!PassesToRun.empty()) {
+    outs() << "Running selected passes on program to test for crash: ";
+    if (runPasses(*Program, PassesToRun))
+      return debugOptimizerCrash();
+  }
+
+  // Set up the execution environment, selecting a method to run LLVM bitcode.
+  if (Error E = initializeExecutionEnvironment())
+    return E;
+
+  // Test to see if we have a code generator crash.
+  outs() << "Running the code generator to test for a crash: ";
+  if (Error E = compileProgram(*Program)) {
+    outs() << toString(std::move(E));
+    return debugCodeGeneratorCrash();
+  }
+  outs() << '\n';
+
+  // Run the raw input to see where we are coming from.  If a reference output
+  // was specified, make sure that the raw output matches it.  If not, it's a
+  // problem in the front-end or the code generator.
+  //
+  bool CreatedOutput = false;
+  if (ReferenceOutputFile.empty()) {
+    outs() << "Generating reference output from raw program: ";
+    if (Error E = createReferenceFile(*Program)) {
+      errs() << toString(std::move(E));
+      return debugCodeGeneratorCrash();
+    }
+    CreatedOutput = true;
+  }
+
+  // Make sure the reference output file gets deleted on exit from this
+  // function, if appropriate.
+  std::string ROF(ReferenceOutputFile);
+  FileRemover RemoverInstance(ROF, CreatedOutput && !SaveTemps);
+
+  // Diff the output of the raw program against the reference output.  If it
+  // matches, then we assume there is a miscompilation bug and try to
+  // diagnose it.
+  outs() << "*** Checking the code generator...\n";
+  Expected<bool> Diff = diffProgram(*Program, "", "", false);
+  if (Error E = Diff.takeError()) {
+    errs() << toString(std::move(E));
+    return debugCodeGeneratorCrash();
+  }
+  if (!*Diff) {
+    outs() << "\n*** Output matches: Debugging miscompilation!\n";
+    if (Error E = debugMiscompilation()) {
+      errs() << toString(std::move(E));
+      return debugCodeGeneratorCrash();
+    }
+    return Error::success();
+  }
+
+  outs() << "\n*** Input program does not match reference diff!\n";
+  outs() << "Debugging code generator problem!\n";
+  if (Error E = debugCodeGenerator()) {
+    errs() << toString(std::move(E));
+    return debugCodeGeneratorCrash();
+  }
+  return Error::success();
+}
+
+void llvm::PrintFunctionList(const std::vector<Function *> &Funcs) {
+  unsigned NumPrint = Funcs.size();
+  if (NumPrint > 10)
+    NumPrint = 10;
+  for (unsigned i = 0; i != NumPrint; ++i)
+    outs() << " " << Funcs[i]->getName();
+  if (NumPrint < Funcs.size())
+    outs() << "... <" << Funcs.size() << " total>";
+  outs().flush();
+}
+
+void llvm::PrintGlobalVariableList(const std::vector<GlobalVariable *> &GVs) {
+  unsigned NumPrint = GVs.size();
+  if (NumPrint > 10)
+    NumPrint = 10;
+  for (unsigned i = 0; i != NumPrint; ++i)
+    outs() << " " << GVs[i]->getName();
+  if (NumPrint < GVs.size())
+    outs() << "... <" << GVs.size() << " total>";
+  outs().flush();
+}