Start writing lto-bugpoint tool.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53774 91177308-0d34-0410-b5e6-96231b3b80d8

tools/lto-bugpoint/LTOBugPoint.cpp

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+//===- LTOBugPoint.cpp - Top-Level LTO BugPoint class ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class contains all of the shared state and information that is used by
+// the LTO BugPoint tool to track down bit code files that cause errors.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LTOBugPoint.h"
+
+LTOBugPoint::LTOBugPoint(std::istream &args, std::istream &ins) {
+
+  // Read linker options. Order is important here.
+  std::string option;
+  while (getline(args, option))
+    LinkerOptions.push_back(option);
+  
+  // Read linker input files. Order is important here.
+  std::string inFile;
+  while(getline(ins, inFile))
+    LinkerInputFiles.push_back(inFile);
+}

tools/lto-bugpoint/LTOBugPoint.h

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+//===- LTOBugPoint.h - Top-Level LTO BugPoint class -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class contains all of the shared state and information that is used by
+// the LTO BugPoint tool to track down bit code files that cause errors.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallVector.h"
+#include <string>
+#include <fstream>
+
+class LTOBugPoint {
+ public:
+
+  LTOBugPoint(std::istream &args, std::istream &ins);
+
+ private:
+  /// LinkerInputFiles - This is a list of linker input files. Once populated
+  /// this list is not modified.
+  llvm::SmallVector<std::string, 16> LinkerInputFiles;
+  llvm::SmallVector<std::string, 16> LinkerOptions;
+
+};

tools/lto-bugpoint/Makefile

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+##===- tools/lto-bugpoint/Makefile -------------------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+LEVEL = ../..
+
+TOOLNAME = lto-bugpoint
+
+REQUIRES_EH := 1
+
+include $(LEVEL)/Makefile.common

tools/lto-bugpoint/lto-bugpoint.cpp

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+//===- lto-bugpoing.cpp - The lto-bugpoint driver -------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// lto-bugpoint tool identifies minmal set of bitcode files that is causing
+// failure when Link Time Optimization is enabled. The failure is identified
+// using developer provided validation script.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LTOBugPoint.h"
+#include <iostream>
+#include <fstream>
+
+int main(int argc, char **argv) {
+  try {
+
+    if (argc !=  4) {
+      std::cerr << "Invalid number of lto-bugpoint arguments!\n";
+      return 1;
+    }
+    
+    std::ios::openmode input_mode = std::ios::in;
+
+    // First argument is linker command line options file. This text file
+    // is a list of linker command line options, one option per line.
+    // First line always list the absolute path to invoke the linker.
+    std::istream *LinkerArgsFile = new std::ifstream(argv[1], input_mode);
+    if (!LinkerArgsFile->good()) {
+      std::cerr << argv[0] << ": error opening " << argv[1] << "!\n";
+      return 1;
+    }
+
+    // Second argment is a text file that includes the linker input
+    // file paths, one input file path per line. 
+    std::istream *LinkerInputsFile = new std::ifstream(argv[2], input_mode);
+    if (!LinkerInputsFile->good()) {
+      std::cerr << argv[0] << ": error opening " << argv[2] << "!\n";
+      delete LinkerArgsFile;
+      return 1;
+    }
+
+    // Third argument is absolute path to the validation script. This
+    // script is used to validate LTO error under investigation.
+    std::istream *ValidationScriptFile = new std::ifstream(argv[3], input_mode);
+    if (!ValidationScriptFile->good()) {
+      std::cerr << argv[0] << ": error opening " << argv[3] << "!\n";
+      delete LinkerArgsFile;
+      delete LinkerInputsFile;
+      return 1;
+    }
+
+    LTOBugPoint bugFinder(*LinkerArgsFile, *LinkerInputsFile);
+
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+  }
+  return 1;
+}