1 files changed, 241 insertions, 0 deletions
diff --git a/llvm/tools/bugpoint/bugpoint.cpp b/llvm/tools/bugpoint/bugpoint.cpp
new file mode 100644
index 000000000000..c7644e75ae4b
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+++ b/llvm/tools/bugpoint/bugpoint.cpp
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+//===- bugpoint.cpp - The LLVM Bugpoint 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 is an automated compiler debugger tool.  It is used to narrow
+// down miscompilations and crash problems to a specific pass in the compiler,
+// and the specific Module or Function input that is causing the problem.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BugDriver.h"
+#include "ToolRunner.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/LegacyPassNameParser.h"
+#include "llvm/LinkAllIR.h"
+#include "llvm/LinkAllPasses.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Support/Valgrind.h"
+#include "llvm/Transforms/IPO/AlwaysInliner.h"
+#include "llvm/Transforms/IPO/PassManagerBuilder.h"
+
+// Enable this macro to debug bugpoint itself.
+//#define DEBUG_BUGPOINT 1
+
+using namespace llvm;
+
+static cl::opt<bool>
+    FindBugs("find-bugs", cl::desc("Run many different optimization sequences "
+                                   "on program to find bugs"),
+             cl::init(false));
+
+static cl::list<std::string>
+    InputFilenames(cl::Positional, cl::OneOrMore,
+                   cl::desc("<input llvm ll/bc files>"));
+
+static cl::opt<unsigned> TimeoutValue(
+    "timeout", cl::init(300), cl::value_desc("seconds"),
+    cl::desc("Number of seconds program is allowed to run before it "
+             "is killed (default is 300s), 0 disables timeout"));
+
+static cl::opt<int> MemoryLimit(
+    "mlimit", cl::init(-1), cl::value_desc("MBytes"),
+    cl::desc("Maximum amount of memory to use. 0 disables check. Defaults to "
+             "400MB (800MB under valgrind, 0 with sanitizers)."));
+
+static cl::opt<bool>
+    UseValgrind("enable-valgrind",
+                cl::desc("Run optimizations through valgrind"));
+
+// The AnalysesList is automatically populated with registered Passes by the
+// PassNameParser.
+//
+static cl::list<const PassInfo *, bool, PassNameParser>
+    PassList(cl::desc("Passes available:"), cl::ZeroOrMore);
+
+static cl::opt<bool>
+    StandardLinkOpts("std-link-opts",
+                     cl::desc("Include the standard link time optimizations"));
+
+static cl::opt<bool>
+    OptLevelO1("O1", cl::desc("Optimization level 1. Identical to 'opt -O1'"));
+
+static cl::opt<bool>
+    OptLevelO2("O2", cl::desc("Optimization level 2. Identical to 'opt -O2'"));
+
+static cl::opt<bool> OptLevelOs(
+    "Os",
+    cl::desc(
+        "Like -O2 with extra optimizations for size. Similar to clang -Os"));
+
+static cl::opt<bool>
+OptLevelOz("Oz",
+           cl::desc("Like -Os but reduces code size further. Similar to clang -Oz"));
+
+static cl::opt<bool>
+    OptLevelO3("O3", cl::desc("Optimization level 3. Identical to 'opt -O3'"));
+
+static cl::opt<std::string>
+    OverrideTriple("mtriple", cl::desc("Override target triple for module"));
+
+/// BugpointIsInterrupted - Set to true when the user presses ctrl-c.
+bool llvm::BugpointIsInterrupted = false;
+
+#ifndef DEBUG_BUGPOINT
+static void BugpointInterruptFunction() { BugpointIsInterrupted = true; }
+#endif
+
+// Hack to capture a pass list.
+namespace {
+class AddToDriver : public legacy::FunctionPassManager {
+  BugDriver &D;
+
+public:
+  AddToDriver(BugDriver &_D) : FunctionPassManager(nullptr), D(_D) {}
+
+  void add(Pass *P) override {
+    const void *ID = P->getPassID();
+    const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID);
+    D.addPass(PI->getPassArgument());
+  }
+};
+}
+
+// This routine adds optimization passes based on selected optimization level,
+// OptLevel.
+//
+// OptLevel - Optimization Level
+static void AddOptimizationPasses(legacy::FunctionPassManager &FPM,
+                                  unsigned OptLevel,
+                                  unsigned SizeLevel) {
+  PassManagerBuilder Builder;
+  Builder.OptLevel = OptLevel;
+  Builder.SizeLevel = SizeLevel;
+
+  if (OptLevel > 1)
+    Builder.Inliner = createFunctionInliningPass(OptLevel, SizeLevel, false);
+  else
+    Builder.Inliner = createAlwaysInlinerLegacyPass();
+
+  Builder.populateFunctionPassManager(FPM);
+  Builder.populateModulePassManager(FPM);
+}
+
+#ifdef LINK_POLLY_INTO_TOOLS
+namespace polly {
+void initializePollyPasses(llvm::PassRegistry &Registry);
+}
+#endif
+
+int main(int argc, char **argv) {
+#ifndef DEBUG_BUGPOINT
+  InitLLVM X(argc, argv);
+#endif
+
+  // Initialize passes
+  PassRegistry &Registry = *PassRegistry::getPassRegistry();
+  initializeCore(Registry);
+  initializeScalarOpts(Registry);
+  initializeObjCARCOpts(Registry);
+  initializeVectorization(Registry);
+  initializeIPO(Registry);
+  initializeAnalysis(Registry);
+  initializeTransformUtils(Registry);
+  initializeInstCombine(Registry);
+  initializeAggressiveInstCombine(Registry);
+  initializeInstrumentation(Registry);
+  initializeTarget(Registry);
+
+#ifdef LINK_POLLY_INTO_TOOLS
+  polly::initializePollyPasses(Registry);
+#endif
+
+  if (std::getenv("bar") == (char*) -1) {
+    InitializeAllTargets();
+    InitializeAllTargetMCs();
+    InitializeAllAsmPrinters();
+    InitializeAllAsmParsers();
+  }
+
+  cl::ParseCommandLineOptions(argc, argv,
+                              "LLVM automatic testcase reducer. See\nhttp://"
+                              "llvm.org/cmds/bugpoint.html"
+                              " for more information.\n");
+#ifndef DEBUG_BUGPOINT
+  sys::SetInterruptFunction(BugpointInterruptFunction);
+#endif
+
+  LLVMContext Context;
+  // If we have an override, set it and then track the triple we want Modules
+  // to use.
+  if (!OverrideTriple.empty()) {
+    TargetTriple.setTriple(Triple::normalize(OverrideTriple));
+    outs() << "Override triple set to '" << TargetTriple.getTriple() << "'\n";
+  }
+
+  if (MemoryLimit < 0) {
+    // Set the default MemoryLimit.  Be sure to update the flag's description if
+    // you change this.
+    if (sys::RunningOnValgrind() || UseValgrind)
+      MemoryLimit = 800;
+    else
+      MemoryLimit = 400;
+#if (LLVM_ADDRESS_SANITIZER_BUILD || LLVM_MEMORY_SANITIZER_BUILD ||            \
+     LLVM_THREAD_SANITIZER_BUILD)
+    // Starting from kernel 4.9 memory allocated with mmap is counted against
+    // RLIMIT_DATA. Sanitizers need to allocate tens of terabytes for shadow.
+    MemoryLimit = 0;
+#endif
+  }
+
+  BugDriver D(argv[0], FindBugs, TimeoutValue, MemoryLimit, UseValgrind,
+              Context);
+  if (D.addSources(InputFilenames))
+    return 1;
+
+  AddToDriver PM(D);
+
+  if (StandardLinkOpts) {
+    PassManagerBuilder Builder;
+    Builder.Inliner = createFunctionInliningPass();
+    Builder.populateLTOPassManager(PM);
+  }
+
+  if (OptLevelO1)
+    AddOptimizationPasses(PM, 1, 0);
+  else if (OptLevelO2)
+    AddOptimizationPasses(PM, 2, 0);
+  else if (OptLevelO3)
+    AddOptimizationPasses(PM, 3, 0);
+  else if (OptLevelOs)
+    AddOptimizationPasses(PM, 2, 1);
+  else if (OptLevelOz)
+    AddOptimizationPasses(PM, 2, 2);
+
+  for (const PassInfo *PI : PassList)
+    D.addPass(PI->getPassArgument());
+
+// Bugpoint has the ability of generating a plethora of core files, so to
+// avoid filling up the disk, we prevent it
+#ifndef DEBUG_BUGPOINT
+  sys::Process::PreventCoreFiles();
+#endif
+
+  if (Error E = D.run()) {
+    errs() << toString(std::move(E));
+    return 1;
+  }
+  return 0;
+}