Add support for disabling llvm.lifetime intrinsics in the AlwaysInliner. These

are optimization hints, but at -O0 we're not optimizing.  This becomes a problem
when the alwaysinline attribute is abused.
rdar://10921594



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151429 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/IPO.h

@@ -94,6 +94,7 @@ Pass *createFunctionInliningPass(int Threshold);
 /// createAlwaysInlinerPass - Return a new pass object that inlines only 
 /// functions that are marked as "always_inline".
 Pass *createAlwaysInlinerPass();
+Pass *createAlwaysInlinerPass(bool InsertLifetime);
 
 //===----------------------------------------------------------------------===//
 /// createPruneEHPass - Return a new pass object which transforms invoke

include/llvm/Transforms/IPO/InlinerPass.h

@@ -31,7 +31,7 @@ namespace llvm {
 ///
 struct Inliner : public CallGraphSCCPass {
   explicit Inliner(char &ID);
-  explicit Inliner(char &ID, int Threshold);
+  explicit Inliner(char &ID, int Threshold, bool InsertLifetime);
 
   /// getAnalysisUsage - For this class, we declare that we require and preserve
   /// the call graph.  If the derived class implements this method, it should
@@ -87,6 +87,9 @@ private:
   // InlineThreshold - Cache the value here for easy access.
   unsigned InlineThreshold;
 
+  // InsertLifetime - Insert @llvm.lifetime intrinsics.
+  bool InsertLifetime;
+
   /// shouldInline - Return true if the inliner should attempt to
   /// inline at the given CallSite.
   bool shouldInline(CallSite CS);

include/llvm/Transforms/Utils/Cloning.h

@@ -197,9 +197,9 @@ public:
 /// exists in the instruction stream.  Similarly this will inline a recursive
 /// function by one level.
 ///
-bool InlineFunction(CallInst *C, InlineFunctionInfo &IFI);
-bool InlineFunction(InvokeInst *II, InlineFunctionInfo &IFI);
-bool InlineFunction(CallSite CS, InlineFunctionInfo &IFI);
+bool InlineFunction(CallInst *C, InlineFunctionInfo &IFI, bool InsertLifetime = true);
+bool InlineFunction(InvokeInst *II, InlineFunctionInfo &IFI, bool InsertLifetime = true);
+bool InlineFunction(CallSite CS, InlineFunctionInfo &IFI, bool InsertLifetime = true);
 
 } // End llvm namespace
 

lib/Transforms/IPO/InlineAlways.cpp

@@ -37,7 +37,11 @@ namespace {
     InlineCostAnalyzer CA;
   public:
     // Use extremely low threshold.
-    AlwaysInliner() : Inliner(ID, -2000000000) {
+    AlwaysInliner() : Inliner(ID, -2000000000, true) {
+      initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
+    }
+    AlwaysInliner(bool InsertLifetime) : Inliner(ID, -2000000000,
+                                                 InsertLifetime) {
       initializeAlwaysInlinerPass(*PassRegistry::getPassRegistry());
     }
     static char ID; // Pass identification, replacement for typeid
@@ -72,6 +76,10 @@ INITIALIZE_PASS_END(AlwaysInliner, "always-inline",
 
 Pass *llvm::createAlwaysInlinerPass() { return new AlwaysInliner(); }
 
+Pass *llvm::createAlwaysInlinerPass(bool InsertLifetime) {
+  return new AlwaysInliner(InsertLifetime);
+}
+
 // doInitialization - Initializes the vector of functions that have not
 // been annotated with the "always inline" attribute.
 bool AlwaysInliner::doInitialization(CallGraph &CG) {

lib/Transforms/IPO/InlineSimple.cpp

@@ -37,7 +37,7 @@ namespace {
     SimpleInliner() : Inliner(ID) {
       initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
     }
-    SimpleInliner(int Threshold) : Inliner(ID, Threshold) {
+    SimpleInliner(int Threshold) : Inliner(ID, Threshold, true) {
       initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
     }
     static char ID; // Pass identification, replacement for typeid

lib/Transforms/IPO/Inliner.cpp

@@ -48,11 +48,12 @@ HintThreshold("inlinehint-threshold", cl::Hidden, cl::init(325),
 const int OptSizeThreshold = 75;
 
 Inliner::Inliner(char &ID) 
-  : CallGraphSCCPass(ID), InlineThreshold(InlineLimit) {}
+  : CallGraphSCCPass(ID), InlineThreshold(InlineLimit), InsertLifetime(true) {}
 
-Inliner::Inliner(char &ID, int Threshold) 
+Inliner::Inliner(char &ID, int Threshold, bool InsertLifetime)
   : CallGraphSCCPass(ID), InlineThreshold(InlineLimit.getNumOccurrences() > 0 ?
-                                          InlineLimit : Threshold) {}
+                                          InlineLimit : Threshold),
+    InsertLifetime(InsertLifetime) {}
 
 /// getAnalysisUsage - For this class, we declare that we require and preserve
 /// the call graph.  If the derived class implements this method, it should
@@ -75,13 +76,13 @@ InlinedArrayAllocasTy;
 /// any new allocas to the set if not possible.
 static bool InlineCallIfPossible(CallSite CS, InlineFunctionInfo &IFI,
                                  InlinedArrayAllocasTy &InlinedArrayAllocas,
-                                 int InlineHistory) {
+                                 int InlineHistory, bool InsertLifetime) {
   Function *Callee = CS.getCalledFunction();
   Function *Caller = CS.getCaller();
 
   // Try to inline the function.  Get the list of static allocas that were
   // inlined.
-  if (!InlineFunction(CS, IFI))
+  if (!InlineFunction(CS, IFI, InsertLifetime))
     return false;
 
   // If the inlined function had a higher stack protection level than the
@@ -439,7 +440,7 @@ bool Inliner::runOnSCC(CallGraphSCC &SCC) {
 
         // Attempt to inline the function.
         if (!InlineCallIfPossible(CS, InlineInfo, InlinedArrayAllocas,
-                                  InlineHistoryID))
+                                  InlineHistoryID, InsertLifetime))
           continue;
         ++NumInlined;
         

lib/Transforms/Utils/InlineFunction.cpp

@@ -31,11 +31,11 @@
 #include "llvm/Support/IRBuilder.h"
 using namespace llvm;
 
-bool llvm::InlineFunction(CallInst *CI, InlineFunctionInfo &IFI) {
-  return InlineFunction(CallSite(CI), IFI);
+bool llvm::InlineFunction(CallInst *CI, InlineFunctionInfo &IFI, bool InsertLifetime) {
+  return InlineFunction(CallSite(CI), IFI, InsertLifetime);
 }
-bool llvm::InlineFunction(InvokeInst *II, InlineFunctionInfo &IFI) {
-  return InlineFunction(CallSite(II), IFI);
+bool llvm::InlineFunction(InvokeInst *II, InlineFunctionInfo &IFI, bool InsertLifetime) {
+  return InlineFunction(CallSite(II), IFI, InsertLifetime);
 }
 
 namespace {
@@ -484,7 +484,7 @@ static void fixupLineNumbers(Function *Fn, Function::iterator FI,
 /// instruction 'call B' is inlined, and 'B' calls 'C', then the call to 'C' now
 /// exists in the instruction stream.  Similarly this will inline a recursive
 /// function by one level.
-bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI) {
+bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI, bool InsertLifetime) {
   Instruction *TheCall = CS.getInstruction();
   assert(TheCall->getParent() && TheCall->getParent()->getParent() &&
          "Instruction not in function!");
@@ -655,7 +655,7 @@ bool llvm::InlineFunction(CallSite CS, InlineFunctionInfo &IFI) {
 
   // Leave lifetime markers for the static alloca's, scoping them to the
   // function we just inlined.
-  if (!IFI.StaticAllocas.empty()) {
+  if (InsertLifetime && !IFI.StaticAllocas.empty()) {
     IRBuilder<> builder(FirstNewBlock->begin());
     for (unsigned ai = 0, ae = IFI.StaticAllocas.size(); ai != ae; ++ai) {
       AllocaInst *AI = IFI.StaticAllocas[ai];