It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 404 insertions, 0 deletions

diff --git a/tools/bugpoint/ExecutionDriver.cpp b/tools/bugpoint/ExecutionDriver.cpp
new file mode 100644
index 0000000..395ac2f
--- /dev/null
+++ b/tools/bugpoint/ExecutionDriver.cpp
@@ -0,0 +1,404 @@
+//===- ExecutionDriver.cpp - Allow execution of LLVM program --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains code used to execute the program utilizing one of the
+// various ways of running LLVM bitcode.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BugDriver.h"
+#include "ToolRunner.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/SystemUtils.h"
+#include <fstream>
+#include <iostream>
+
+using namespace llvm;
+
+namespace {
+  // OutputType - Allow the user to specify the way code should be run, to test
+  // for miscompilation.
+  //
+  enum OutputType {
+    AutoPick, RunLLI, RunJIT, RunLLC, RunCBE, CBE_bug, LLC_Safe
+  };
+
+  cl::opt<double>
+  AbsTolerance("abs-tolerance", cl::desc("Absolute error tolerated"),
+               cl::init(0.0));
+  cl::opt<double>
+  RelTolerance("rel-tolerance", cl::desc("Relative error tolerated"),
+               cl::init(0.0));
+
+  cl::opt<OutputType>
+  InterpreterSel(cl::desc("Specify how LLVM code should be executed:"),
+                 cl::values(clEnumValN(AutoPick, "auto", "Use best guess"),
+                            clEnumValN(RunLLI, "run-int",
+                                       "Execute with the interpreter"),
+                            clEnumValN(RunJIT, "run-jit", "Execute with JIT"),
+                            clEnumValN(RunLLC, "run-llc", "Compile with LLC"),
+                            clEnumValN(RunCBE, "run-cbe", "Compile with CBE"),
+                            clEnumValN(CBE_bug,"cbe-bug", "Find CBE bugs"),
+                            clEnumValN(LLC_Safe, "llc-safe", "Use LLC for all"),
+                            clEnumValEnd),
+                 cl::init(AutoPick));
+
+  cl::opt<bool>
+  CheckProgramExitCode("check-exit-code",
+                   cl::desc("Assume nonzero exit code is failure (default on)"),
+                       cl::init(true));
+
+  cl::opt<bool>
+  AppendProgramExitCode("append-exit-code",
+      cl::desc("Append the exit code to the output so it gets diff'd too"),
+      cl::init(false));
+
+  cl::opt<std::string>
+  InputFile("input", cl::init("/dev/null"),
+            cl::desc("Filename to pipe in as stdin (default: /dev/null)"));
+
+  cl::list<std::string>
+  AdditionalSOs("additional-so",
+                cl::desc("Additional shared objects to load "
+                         "into executing programs"));
+
+  cl::list<std::string>
+    AdditionalLinkerArgs("Xlinker", 
+      cl::desc("Additional arguments to pass to the linker"));
+}
+
+namespace llvm {
+  // Anything specified after the --args option are taken as arguments to the
+  // program being debugged.
+  cl::list<std::string>
+  InputArgv("args", cl::Positional, cl::desc("<program arguments>..."),
+            cl::ZeroOrMore, cl::PositionalEatsArgs);
+
+  cl::list<std::string>
+  ToolArgv("tool-args", cl::Positional, cl::desc("<tool arguments>..."),
+           cl::ZeroOrMore, cl::PositionalEatsArgs);
+}
+
+//===----------------------------------------------------------------------===//
+// BugDriver method implementation
+//
+
+/// initializeExecutionEnvironment - This method is used to set up the
+/// environment for executing LLVM programs.
+///
+bool BugDriver::initializeExecutionEnvironment() {
+  std::cout << "Initializing execution environment: ";
+
+  // Create an instance of the AbstractInterpreter interface as specified on
+  // the command line
+  cbe = 0;
+  std::string Message;
+
+  switch (InterpreterSel) {
+  case AutoPick:
+    InterpreterSel = RunCBE;
+    Interpreter = cbe = AbstractInterpreter::createCBE(getToolName(), Message,
+                                                       &ToolArgv);
+    if (!Interpreter) {
+      InterpreterSel = RunJIT;
+      Interpreter = AbstractInterpreter::createJIT(getToolName(), Message,
+                                                   &ToolArgv);
+    }
+    if (!Interpreter) {
+      InterpreterSel = RunLLC;
+      Interpreter = AbstractInterpreter::createLLC(getToolName(), Message,
+                                                   &ToolArgv);
+    }
+    if (!Interpreter) {
+      InterpreterSel = RunLLI;
+      Interpreter = AbstractInterpreter::createLLI(getToolName(), Message,
+                                                   &ToolArgv);
+    }
+    if (!Interpreter) {
+      InterpreterSel = AutoPick;
+      Message = "Sorry, I can't automatically select an interpreter!\n";
+    }
+    break;
+  case RunLLI:
+    Interpreter = AbstractInterpreter::createLLI(getToolName(), Message,
+                                                 &ToolArgv);
+    break;
+  case RunLLC:
+    Interpreter = AbstractInterpreter::createLLC(getToolName(), Message,
+                                                 &ToolArgv);
+    break;
+  case RunJIT:
+    Interpreter = AbstractInterpreter::createJIT(getToolName(), Message,
+                                                 &ToolArgv);
+    break;
+  case LLC_Safe:
+    Interpreter = AbstractInterpreter::createLLC(getToolName(), Message,
+                                                 &ToolArgv);
+    break;
+  case RunCBE:
+  case CBE_bug:
+    Interpreter = AbstractInterpreter::createCBE(getToolName(), Message,
+                                                 &ToolArgv);
+    break;
+  default:
+    Message = "Sorry, this back-end is not supported by bugpoint right now!\n";
+    break;
+  }
+  std::cerr << Message;
+
+  // Initialize auxiliary tools for debugging
+  if (InterpreterSel == RunCBE) {
+    // We already created a CBE, reuse it.
+    cbe = Interpreter;
+  } else if (InterpreterSel == CBE_bug || InterpreterSel == LLC_Safe) {
+    // We want to debug the CBE itself or LLC is known-good.  Use LLC as the
+    // 'known-good' compiler.
+    std::vector<std::string> ToolArgs;
+    ToolArgs.push_back("--relocation-model=pic");
+    cbe = AbstractInterpreter::createLLC(getToolName(), Message, &ToolArgs);
+  } else {
+    cbe = AbstractInterpreter::createCBE(getToolName(), Message, &ToolArgv);
+  }
+  if (!cbe) { std::cout << Message << "\nExiting.\n"; exit(1); }
+  
+  gcc = GCC::create(getToolName(), Message);
+  if (!gcc) { std::cout << Message << "\nExiting.\n"; exit(1); }
+
+  // If there was an error creating the selected interpreter, quit with error.
+  return Interpreter == 0;
+}
+
+/// compileProgram - Try to compile the specified module, throwing an exception
+/// if an error occurs, or returning normally if not.  This is used for code
+/// generation crash testing.
+///
+void BugDriver::compileProgram(Module *M) {
+  // Emit the program to a bitcode file...
+  sys::Path BitcodeFile ("bugpoint-test-program.bc");
+  std::string ErrMsg;
+  if (BitcodeFile.makeUnique(true,&ErrMsg)) {
+    std::cerr << ToolName << ": Error making unique filename: " << ErrMsg 
+              << "\n";
+    exit(1);
+  }
+  if (writeProgramToFile(BitcodeFile.toString(), M)) {
+    std::cerr << ToolName << ": Error emitting bitcode to file '"
+              << BitcodeFile << "'!\n";
+    exit(1);
+  }
+
+    // Remove the temporary bitcode file when we are done.
+  FileRemover BitcodeFileRemover(BitcodeFile);
+
+  // Actually compile the program!
+  Interpreter->compileProgram(BitcodeFile.toString());
+}
+
+
+/// executeProgram - This method runs "Program", capturing the output of the
+/// program to a file, returning the filename of the file.  A recommended
+/// filename may be optionally specified.
+///
+std::string BugDriver::executeProgram(std::string OutputFile,
+                                      std::string BitcodeFile,
+                                      const std::string &SharedObj,
+                                      AbstractInterpreter *AI,
+                                      bool *ProgramExitedNonzero) {
+  if (AI == 0) AI = Interpreter;
+  assert(AI && "Interpreter should have been created already!");
+  bool CreatedBitcode = false;
+  std::string ErrMsg;
+  if (BitcodeFile.empty()) {
+    // Emit the program to a bitcode file...
+    sys::Path uniqueFilename("bugpoint-test-program.bc");
+    if (uniqueFilename.makeUnique(true, &ErrMsg)) {
+      std::cerr << ToolName << ": Error making unique filename: " 
+                << ErrMsg << "!\n";
+      exit(1);
+    }
+    BitcodeFile = uniqueFilename.toString();
+
+    if (writeProgramToFile(BitcodeFile, Program)) {
+      std::cerr << ToolName << ": Error emitting bitcode to file '"
+                << BitcodeFile << "'!\n";
+      exit(1);
+    }
+    CreatedBitcode = true;
+  }
+
+  // Remove the temporary bitcode file when we are done.
+  sys::Path BitcodePath (BitcodeFile);
+  FileRemover BitcodeFileRemover(BitcodePath, CreatedBitcode);
+
+  if (OutputFile.empty()) OutputFile = "bugpoint-execution-output";
+
+  // Check to see if this is a valid output filename...
+  sys::Path uniqueFile(OutputFile);
+  if (uniqueFile.makeUnique(true, &ErrMsg)) {
+    std::cerr << ToolName << ": Error making unique filename: "
+              << ErrMsg << "\n";
+    exit(1);
+  }
+  OutputFile = uniqueFile.toString();
+
+  // Figure out which shared objects to run, if any.
+  std::vector<std::string> SharedObjs(AdditionalSOs);
+  if (!SharedObj.empty())
+    SharedObjs.push_back(SharedObj);
+
+  
+  // If this is an LLC or CBE run, then the GCC compiler might get run to 
+  // compile the program. If so, we should pass the user's -Xlinker options
+  // as the GCCArgs.
+  int RetVal = 0;
+  if (InterpreterSel == RunLLC || InterpreterSel == RunCBE ||
+      InterpreterSel == CBE_bug || InterpreterSel == LLC_Safe)
+    RetVal = AI->ExecuteProgram(BitcodeFile, InputArgv, InputFile,
+                                OutputFile, AdditionalLinkerArgs, SharedObjs, 
+                                Timeout, MemoryLimit);
+  else 
+    RetVal = AI->ExecuteProgram(BitcodeFile, InputArgv, InputFile,
+                                OutputFile, std::vector<std::string>(), 
+                                SharedObjs, Timeout, MemoryLimit);
+
+  if (RetVal == -1) {
+    std::cerr << "<timeout>";
+    static bool FirstTimeout = true;
+    if (FirstTimeout) {
+      std::cout << "\n"
+ "*** Program execution timed out!  This mechanism is designed to handle\n"
+ "    programs stuck in infinite loops gracefully.  The -timeout option\n"
+ "    can be used to change the timeout threshold or disable it completely\n"
+ "    (with -timeout=0).  This message is only displayed once.\n";
+      FirstTimeout = false;
+    }
+  }
+
+  if (AppendProgramExitCode) {
+    std::ofstream outFile(OutputFile.c_str(), std::ios_base::app);
+    outFile << "exit " << RetVal << '\n';
+    outFile.close();
+  }
+
+  if (ProgramExitedNonzero != 0)
+    *ProgramExitedNonzero = (RetVal != 0);
+
+  // Return the filename we captured the output to.
+  return OutputFile;
+}
+
+/// executeProgramWithCBE - Used to create reference output with the C
+/// backend, if reference output is not provided.
+///
+std::string BugDriver::executeProgramWithCBE(std::string OutputFile) {
+  bool ProgramExitedNonzero;
+  std::string outFN = executeProgram(OutputFile, "", "", cbe,
+                                     &ProgramExitedNonzero);
+  if (ProgramExitedNonzero) {
+    std::cerr
+      << "Warning: While generating reference output, program exited with\n"
+      << "non-zero exit code. This will NOT be treated as a failure.\n";
+    CheckProgramExitCode = false;
+  }
+  return outFN;
+}
+
+std::string BugDriver::compileSharedObject(const std::string &BitcodeFile) {
+  assert(Interpreter && "Interpreter should have been created already!");
+  sys::Path OutputFile;
+
+  // Using CBE
+  GCC::FileType FT = cbe->OutputCode(BitcodeFile, OutputFile);
+
+  std::string SharedObjectFile;
+  if (gcc->MakeSharedObject(OutputFile.toString(), FT,
+                            SharedObjectFile, AdditionalLinkerArgs))
+    exit(1);
+
+  // Remove the intermediate C file
+  OutputFile.eraseFromDisk();
+
+  return "./" + SharedObjectFile;
+}
+
+/// createReferenceFile - calls compileProgram and then records the output
+/// into ReferenceOutputFile. Returns true if reference file created, false 
+/// otherwise. Note: initializeExecutionEnvironment should be called BEFORE
+/// this function.
+///
+bool BugDriver::createReferenceFile(Module *M, const std::string &Filename) {
+  try {
+    compileProgram(Program);
+  } catch (ToolExecutionError &) {
+    return false;
+  }
+  try {
+    ReferenceOutputFile = executeProgramWithCBE(Filename);
+    std::cout << "Reference output is: " << ReferenceOutputFile << "\n\n";
+  } catch (ToolExecutionError &TEE) {
+    std::cerr << TEE.what();
+    if (Interpreter != cbe) {
+      std::cerr << "*** There is a bug running the C backend.  Either debug"
+                << " it (use the -run-cbe bugpoint option), or fix the error"
+                << " some other way.\n";
+    }
+    return false;
+  }
+  return true;
+}
+
+/// diffProgram - This method executes the specified module and diffs the
+/// output against the file specified by ReferenceOutputFile.  If the output
+/// is different, true is returned.  If there is a problem with the code
+/// generator (e.g., llc crashes), this will throw an exception.
+///
+bool BugDriver::diffProgram(const std::string &BitcodeFile,
+                            const std::string &SharedObject,
+                            bool RemoveBitcode) {
+  bool ProgramExitedNonzero;
+
+  // Execute the program, generating an output file...
+  sys::Path Output(executeProgram("", BitcodeFile, SharedObject, 0,
+                                      &ProgramExitedNonzero));
+
+  // If we're checking the program exit code, assume anything nonzero is bad.
+  if (CheckProgramExitCode && ProgramExitedNonzero) {
+    Output.eraseFromDisk();
+    if (RemoveBitcode)
+      sys::Path(BitcodeFile).eraseFromDisk();
+    return true;
+  }
+
+  std::string Error;
+  bool FilesDifferent = false;
+  if (int Diff = DiffFilesWithTolerance(sys::Path(ReferenceOutputFile),
+                                        sys::Path(Output.toString()),
+                                        AbsTolerance, RelTolerance, &Error)) {
+    if (Diff == 2) {
+      std::cerr << "While diffing output: " << Error << '\n';
+      exit(1);
+    }
+    FilesDifferent = true;
+  }
+
+  // Remove the generated output.
+  Output.eraseFromDisk();
+
+  // Remove the bitcode file if we are supposed to.
+  if (RemoveBitcode)
+    sys::Path(BitcodeFile).eraseFromDisk();
+  return FilesDifferent;
+}
+
+bool BugDriver::isExecutingJIT() {
+  return InterpreterSel == RunJIT;
+}
+