1 files changed, 114 insertions, 0 deletions
diff --git a/tools/llvm-reduce/llvm-reduce.cpp b/tools/llvm-reduce/llvm-reduce.cpp
new file mode 100644
index 000000000000..83dcf980a786
--- /dev/null
+++ b/tools/llvm-reduce/llvm-reduce.cpp
@@ -0,0 +1,114 @@
+//===- llvm-reduce.cpp - The LLVM Delta Reduction utility -----------------===//
+//
+// 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 program tries to reduce an IR test case for a given interesting-ness
+// test. It runs multiple delta debugging passes in order to minimize the input
+// file. It's worth noting that this is a part of the bugpoint redesign
+// proposal, and thus a *temporary* tool that will eventually be integrated
+// into the bugpoint tool itself.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DeltaManager.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/IRReader/IRReader.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/raw_ostream.h"
+#include <system_error>
+#include <vector>
+
+using namespace llvm;
+
+static cl::opt<bool> Help("h", cl::desc("Alias for -help"), cl::Hidden);
+static cl::opt<bool> Version("v", cl::desc("Alias for -version"), cl::Hidden);
+
+static cl::opt<std::string> InputFilename(cl::Positional, cl::Required,
+                                          cl::desc("<input llvm ll/bc file>"));
+
+static cl::opt<std::string>
+    TestFilename("test", cl::Required,
+                 cl::desc("Name of the interesting-ness test to be run"));
+
+static cl::list<std::string>
+    TestArguments("test-arg", cl::ZeroOrMore,
+                  cl::desc("Arguments passed onto the interesting-ness test"));
+
+static cl::opt<std::string>
+    OutputFilename("output",
+                   cl::desc("Specify the output file. default: reduced.ll"));
+static cl::alias OutputFileAlias("o", cl::desc("Alias for -output"),
+                                 cl::aliasopt(OutputFilename));
+
+static cl::opt<bool>
+    ReplaceInput("in-place",
+                 cl::desc("WARNING: This option will replace your input file"
+                          "with the reduced version!"));
+
+// Parses IR into a Module and verifies it
+static std::unique_ptr<Module> parseInputFile(StringRef Filename,
+                                              LLVMContext &Ctxt) {
+  SMDiagnostic Err;
+  std::unique_ptr<Module> Result = parseIRFile(Filename, Err, Ctxt);
+  if (!Result) {
+    Err.print("llvm-reduce", errs());
+    return Result;
+  }
+
+  if (verifyModule(*Result, &errs())) {
+    errs() << "Error: " << Filename << " - input module is broken!\n";
+    return std::unique_ptr<Module>();
+  }
+
+  return Result;
+}
+
+int main(int argc, char **argv) {
+  InitLLVM X(argc, argv);
+
+  cl::ParseCommandLineOptions(argc, argv, "LLVM automatic testcase reducer.\n");
+
+  LLVMContext Context;
+  std::unique_ptr<Module> OriginalProgram =
+      parseInputFile(InputFilename, Context);
+
+  // Initialize test environment
+  TestRunner Tester(TestFilename, TestArguments);
+  Tester.setProgram(std::move(OriginalProgram));
+
+  // Try to reduce code
+  runDeltaPasses(Tester);
+
+  if (!Tester.getProgram()) {
+    errs() << "\nCouldnt reduce input :/\n";
+  } else {
+    // Print reduced file to STDOUT
+    if (OutputFilename == "-")
+      Tester.getProgram()->print(outs(), nullptr);
+    else {
+      if (ReplaceInput) // In-place
+        OutputFilename = InputFilename.c_str();
+      else if (OutputFilename.empty())
+        OutputFilename = "reduced.ll";
+
+      std::error_code EC;
+      raw_fd_ostream Out(OutputFilename, EC);
+      if (EC) {
+        errs() << "Error opening output file: " << EC.message() << "!\n";
+        exit(1);
+      }
+      Tester.getProgram()->print(Out, /*AnnotationWriter=*/nullptr);
+      errs() << "\nDone reducing! Reduced testcase: " << OutputFilename << "\n";
+    }
+  }
+
+  return 0;
+}