[NFC] [hwasan] factor out some opt handling

Pull Request: llvm#84414

Author: fmayer

llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp

@@ -260,6 +260,10 @@ static cl::opt<bool> ClUsePageAliases("hwasan-experimental-use-page-aliases",
 
 namespace {
 
+template <typename T> T optOr(cl::opt<T> &Opt, T Other) {
+  return Opt.getNumOccurrences() ? Opt : Other;
+}
+
 bool shouldUsePageAliases(const Triple &TargetTriple) {
   return ClUsePageAliases && TargetTriple.getArch() == Triple::x86_64;
 }
@@ -269,14 +273,11 @@ bool shouldInstrumentStack(const Triple &TargetTriple) {
 }
 
 bool shouldInstrumentWithCalls(const Triple &TargetTriple) {
-  return ClInstrumentWithCalls.getNumOccurrences()
-             ? ClInstrumentWithCalls
-             : TargetTriple.getArch() == Triple::x86_64;
+  return optOr(ClInstrumentWithCalls, TargetTriple.getArch() == Triple::x86_64);
 }
 
 bool mightUseStackSafetyAnalysis(bool DisableOptimization) {
-  return ClUseStackSafety.getNumOccurrences() ? ClUseStackSafety
-                                              : !DisableOptimization;
+  return optOr(ClUseStackSafety, !DisableOptimization);
 }
 
 bool shouldUseStackSafetyAnalysis(const Triple &TargetTriple,
@@ -296,10 +297,8 @@ class HWAddressSanitizer {
   HWAddressSanitizer(Module &M, bool CompileKernel, bool Recover,
                      const StackSafetyGlobalInfo *SSI)
       : M(M), SSI(SSI) {
-    this->Recover = ClRecover.getNumOccurrences() > 0 ? ClRecover : Recover;
-    this->CompileKernel = ClEnableKhwasan.getNumOccurrences() > 0
-                              ? ClEnableKhwasan
-                              : CompileKernel;
+    this->Recover = optOr(ClRecover, Recover);
+    this->CompileKernel = optOr(ClEnableKhwasan, CompileKernel);
     this->Rng =
         RandomSkipRate.getNumOccurrences() ? M.createRNG("hwasan") : nullptr;
 
@@ -624,19 +623,14 @@ void HWAddressSanitizer::initializeModule() {
   bool NewRuntime =
       !TargetTriple.isAndroid() || !TargetTriple.isAndroidVersionLT(30);
 
-  UseShortGranules =
-      ClUseShortGranules.getNumOccurrences() ? ClUseShortGranules : NewRuntime;
-  OutlinedChecks =
-      (TargetTriple.isAArch64() || TargetTriple.isRISCV64()) &&
-      TargetTriple.isOSBinFormatELF() &&
-      (ClInlineAllChecks.getNumOccurrences() ? !ClInlineAllChecks : !Recover);
+  UseShortGranules = optOr(ClUseShortGranules, NewRuntime);
+  OutlinedChecks = (TargetTriple.isAArch64() || TargetTriple.isRISCV64()) &&
+                   TargetTriple.isOSBinFormatELF() &&
+                   !optOr(ClInlineAllChecks, Recover);
 
-  InlineFastPath =
-      (ClInlineFastPathChecks.getNumOccurrences()
-           ? ClInlineFastPathChecks
-           : !(TargetTriple.isAndroid() ||
-               TargetTriple.isOSFuchsia())); // These platforms may prefer less
-                                             // inlining to reduce binary size.
+  // These platforms may prefer less inlining to reduce binary size.
+  InlineFastPath = optOr(ClInlineFastPathChecks, !(TargetTriple.isAndroid() ||
+                                                   TargetTriple.isOSFuchsia()));
 
   if (ClMatchAllTag.getNumOccurrences()) {
     if (ClMatchAllTag != -1) {
@@ -648,22 +642,17 @@ void HWAddressSanitizer::initializeModule() {
   UseMatchAllCallback = !CompileKernel && MatchAllTag.has_value();
 
   // If we don't have personality function support, fall back to landing pads.
-  InstrumentLandingPads = ClInstrumentLandingPads.getNumOccurrences()
-                              ? ClInstrumentLandingPads
-                              : !NewRuntime;
+  InstrumentLandingPads = optOr(ClInstrumentLandingPads, !NewRuntime);
 
   if (!CompileKernel) {
     createHwasanCtorComdat();
-    bool InstrumentGlobals =
-        ClGlobals.getNumOccurrences() ? ClGlobals : NewRuntime;
+    bool InstrumentGlobals = optOr(ClGlobals, NewRuntime);
 
     if (InstrumentGlobals && !UsePageAliases)
       instrumentGlobals();
 
     bool InstrumentPersonalityFunctions =
-        ClInstrumentPersonalityFunctions.getNumOccurrences()
-            ? ClInstrumentPersonalityFunctions
-            : NewRuntime;
+        optOr(ClInstrumentPersonalityFunctions, NewRuntime);
     if (InstrumentPersonalityFunctions)
       instrumentPersonalityFunctions();
   }