lib/StaticAnalyzer/Core/AnalyzerOptions.cpp

//===-- AnalyzerOptions.cpp - Analysis Engine Options -----------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains special accessors for analyzer configuration options
// with string representations.
//
//===----------------------------------------------------------------------===//

#include "clang/StaticAnalyzer/Core/AnalyzerOptions.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"

using namespace clang;
using namespace llvm;

AnalyzerOptions::UserModeKind AnalyzerOptions::getUserMode() {
  if (UserMode == UMK_NotSet) {
    StringRef ModeStr(Config.GetOrCreateValue("mode", "deep").getValue());
    UserMode = llvm::StringSwitch<UserModeKind>(ModeStr)
      .Case("shallow", UMK_Shallow)
      .Case("deep", UMK_Deep)
      .Default(UMK_NotSet);
    assert(UserMode != UMK_NotSet && "User mode is invalid.");
  }
  return UserMode;
}

IPAKind AnalyzerOptions::getIPAMode() {
  if (IPAMode == IPAK_NotSet) {

    // Use the User Mode to set the default IPA value.
    // Note, we have to add the string to the Config map for the ConfigDumper
    // checker to function properly.
    const char *DefaultIPA = 0;
    UserModeKind HighLevelMode = getUserMode();
    if (HighLevelMode == UMK_Shallow)
      DefaultIPA = "inlining";
    else if (HighLevelMode == UMK_Deep)
      DefaultIPA = "dynamic-bifurcate";
    assert(DefaultIPA);

    // Lookup the ipa configuration option, use the default from User Mode.
    StringRef ModeStr(Config.GetOrCreateValue("ipa", DefaultIPA).getValue());
    IPAKind IPAConfig = llvm::StringSwitch<IPAKind>(ModeStr)
            .Case("none", IPAK_None)
            .Case("basic-inlining", IPAK_BasicInlining)
            .Case("inlining", IPAK_Inlining)
            .Case("dynamic", IPAK_DynamicDispatch)
            .Case("dynamic-bifurcate", IPAK_DynamicDispatchBifurcate)
            .Default(IPAK_NotSet);
    assert(IPAConfig != IPAK_NotSet && "IPA Mode is invalid.");

    // Set the member variable.
    IPAMode = IPAConfig;
  }
  
  return IPAMode;
}

bool
AnalyzerOptions::mayInlineCXXMemberFunction(CXXInlineableMemberKind K) {
  if (getIPAMode() < IPAK_Inlining)
    return false;

  if (!CXXMemberInliningMode) {
    static const char *ModeKey = "c++-inlining";
    
    StringRef ModeStr(Config.GetOrCreateValue(ModeKey,
                                              "methods").getValue());

    CXXInlineableMemberKind &MutableMode =
      const_cast<CXXInlineableMemberKind &>(CXXMemberInliningMode);

    MutableMode = llvm::StringSwitch<CXXInlineableMemberKind>(ModeStr)
      .Case("constructors", CIMK_Constructors)
      .Case("destructors", CIMK_Destructors)
      .Case("none", CIMK_None)
      .Case("methods", CIMK_MemberFunctions)
      .Default(CXXInlineableMemberKind());

    if (!MutableMode) {
      // FIXME: We should emit a warning here about an unknown inlining kind,
      // but the AnalyzerOptions doesn't have access to a diagnostic engine.
      MutableMode = CIMK_None;
    }
  }

  return CXXMemberInliningMode >= K;
}

static StringRef toString(bool b) { return b ? "true" : "false"; }

bool AnalyzerOptions::getBooleanOption(StringRef Name, bool DefaultVal) {
  // FIXME: We should emit a warning here if the value is something other than
  // "true", "false", or the empty string (meaning the default value),
  // but the AnalyzerOptions doesn't have access to a diagnostic engine.
  StringRef V(Config.GetOrCreateValue(Name, toString(DefaultVal)).getValue());
  return llvm::StringSwitch<bool>(V)
      .Case("true", true)
      .Case("false", false)
      .Default(DefaultVal);
}

bool AnalyzerOptions::getBooleanOption(Optional<bool> &V, StringRef Name,
                                       bool DefaultVal) {
  if (!V.hasValue())
    V = getBooleanOption(Name, DefaultVal);
  return V.getValue();
}

bool AnalyzerOptions::includeTemporaryDtorsInCFG() {
  return getBooleanOption(IncludeTemporaryDtorsInCFG,
                          "cfg-temporary-dtors",
                          /* Default = */ false);
}

bool AnalyzerOptions::mayInlineCXXStandardLibrary() {
  return getBooleanOption(InlineCXXStandardLibrary,
                          "c++-stdlib-inlining",
                          /*Default=*/true);
}

bool AnalyzerOptions::mayInlineTemplateFunctions() {
  return getBooleanOption(InlineTemplateFunctions,
                          "c++-template-inlining",
                          /*Default=*/true);
}

bool AnalyzerOptions::mayInlineObjCMethod() {
  return getBooleanOption(ObjCInliningMode,
                          "objc-inlining",
                          /* Default = */ true);
}

bool AnalyzerOptions::shouldSuppressNullReturnPaths() {
  return getBooleanOption(SuppressNullReturnPaths,
                          "suppress-null-return-paths",
                          /* Default = */ true);
}

bool AnalyzerOptions::shouldAvoidSuppressingNullArgumentPaths() {
  return getBooleanOption(AvoidSuppressingNullArgumentPaths,
                          "avoid-suppressing-null-argument-paths",
                          /* Default = */ false);
}

int AnalyzerOptions::getOptionAsInteger(StringRef Name, int DefaultVal) {
  SmallString<10> StrBuf;
  llvm::raw_svector_ostream OS(StrBuf);
  OS << DefaultVal;
  
  StringRef V(Config.GetOrCreateValue(Name, OS.str()).getValue());
  int Res = DefaultVal;
  bool b = V.getAsInteger(10, Res);
  assert(!b && "analyzer-config option should be numeric");
  (void) b;
  return Res;
}

unsigned AnalyzerOptions::getAlwaysInlineSize() {
  if (!AlwaysInlineSize.hasValue())
    AlwaysInlineSize = getOptionAsInteger("ipa-always-inline-size", 3);
  return AlwaysInlineSize.getValue();
}

unsigned AnalyzerOptions::getMaxInlinableSize() {
  if (!MaxInlinableSize.hasValue()) {

    int DefaultValue = 0;
    UserModeKind HighLevelMode = getUserMode();
    switch (HighLevelMode) {
      default:
        llvm_unreachable("Invalid mode.");
      case UMK_Shallow:
        DefaultValue = 4;
        break;
      case UMK_Deep:
        DefaultValue = 50;
        break;
    }

    MaxInlinableSize = getOptionAsInteger("max-inlinable-size", DefaultValue);
  }
  return MaxInlinableSize.getValue();
}

unsigned AnalyzerOptions::getGraphTrimInterval() {
  if (!GraphTrimInterval.hasValue())
    GraphTrimInterval = getOptionAsInteger("graph-trim-interval", 1000);
  return GraphTrimInterval.getValue();
}

unsigned AnalyzerOptions::getMaxTimesInlineLarge() {
  if (!MaxTimesInlineLarge.hasValue())
    MaxTimesInlineLarge = getOptionAsInteger("max-times-inline-large", 32);
  return MaxTimesInlineLarge.getValue();
}

unsigned AnalyzerOptions::getMaxNodesPerTopLevelFunction() {
  if (!MaxNodesPerTopLevelFunction.hasValue()) {
    int DefaultValue = 0;
    UserModeKind HighLevelMode = getUserMode();
    switch (HighLevelMode) {
      default:
        llvm_unreachable("Invalid mode.");
      case UMK_Shallow:
        DefaultValue = 75000;
        break;
      case UMK_Deep:
        DefaultValue = 150000;
        break;
    }
    MaxNodesPerTopLevelFunction = getOptionAsInteger("max-nodes", DefaultValue);
  }
  return MaxNodesPerTopLevelFunction.getValue();
}

bool AnalyzerOptions::shouldSynthesizeBodies() {
  return getBooleanOption("faux-bodies", true);
}

bool AnalyzerOptions::shouldPrunePaths() {
  return getBooleanOption("prune-paths", true);
}