X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FShadowStackGC.cpp;h=f7c64dac61246ed0d58957d8493c25a6bfc4d9bd;hb=f2b844d0b1d1cf62ba172f97981840fa9ccdf693;hp=bccb3b9927a03cec9e138ad02e7a73d8922e9e26;hpb=3ebb64946bc8e7c8feba1b2044e7a47f80b3a83f;p=oota-llvm.git

diff --git a/lib/CodeGen/ShadowStackGC.cpp b/lib/CodeGen/ShadowStackGC.cpp
index bccb3b9927a..f7c64dac612 100644
--- a/lib/CodeGen/ShadowStackGC.cpp
+++ b/lib/CodeGen/ShadowStackGC.cpp
@@ -25,17 +25,18 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "shadowstackgc"
 #include "llvm/CodeGen/GCs.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/CodeGen/GCStrategy.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/Module.h"
-#include "llvm/Support/CallSite.h"
-#include "llvm/Support/IRBuilder.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Module.h"
 
 using namespace llvm;
 
+#define DEBUG_TYPE "shadowstackgc"
+
 namespace {
 
   class ShadowStackGC : public GCStrategy {
@@ -55,8 +56,8 @@ namespace {
   public:
     ShadowStackGC();
 
-    bool initializeCustomLowering(Module &M);
-    bool performCustomLowering(Function &F);
+    bool initializeCustomLowering(Module &M) override;
+    bool performCustomLowering(Function &F) override;
 
   private:
     bool IsNullValue(Value *V);
@@ -101,7 +102,7 @@ namespace {
     IRBuilder<> *Next() {
       switch (State) {
       default:
-        return 0;
+        return nullptr;
 
       case 0:
         StateBB = F.begin();
@@ -109,15 +110,14 @@ namespace {
         State = 1;
 
       case 1:
-        // Find all 'return' and 'unwind' instructions.
+        // Find all 'return', 'resume', and 'unwind' instructions.
         while (StateBB != StateE) {
           BasicBlock *CurBB = StateBB++;
 
           // Branches and invokes do not escape, only unwind, resume, and return
           // do.
           TerminatorInst *TI = CurBB->getTerminator();
-          if (!isa<UnwindInst>(TI) && !isa<ReturnInst>(TI) &&
-              !isa<ResumeInst>(TI))
+          if (!isa<ReturnInst>(TI) && !isa<ResumeInst>(TI))
             continue;
 
           Builder.SetInsertPoint(TI->getParent(), TI);
@@ -138,12 +138,22 @@ namespace {
                 Calls.push_back(CI);
 
         if (Calls.empty())
-          return 0;
+          return nullptr;
 
         // Create a cleanup block.
-        BasicBlock *CleanupBB = BasicBlock::Create(F.getContext(),
-                                                   CleanupBBName, &F);
-        UnwindInst *UI = new UnwindInst(F.getContext(), CleanupBB);
+        LLVMContext &C = F.getContext();
+        BasicBlock *CleanupBB = BasicBlock::Create(C, CleanupBBName, &F);
+        Type *ExnTy = StructType::get(Type::getInt8PtrTy(C),
+                                      Type::getInt32Ty(C), NULL);
+        Constant *PersFn =
+          F.getParent()->
+          getOrInsertFunction("__gcc_personality_v0",
+                              FunctionType::get(Type::getInt32Ty(C), true));
+        LandingPadInst *LPad = LandingPadInst::Create(ExnTy, PersFn, 1,
+                                                      "cleanup.lpad",
+                                                      CleanupBB);
+        LPad->setCleanup(true);
+        ResumeInst *RI = ResumeInst::Create(LPad, CleanupBB);
 
         // Transform the 'call' instructions into 'invoke's branching to the
         // cleanup block. Go in reverse order to make prettier BB names.
@@ -174,7 +184,7 @@ namespace {
           delete CI;
         }
 
-        Builder.SetInsertPoint(UI->getParent(), UI);
+        Builder.SetInsertPoint(RI->getParent(), RI);
         return &Builder;
       }
     }
@@ -185,7 +195,7 @@ namespace {
 
 void llvm::linkShadowStackGC() { }
 
-ShadowStackGC::ShadowStackGC() : Head(0), StackEntryTy(0) {
+ShadowStackGC::ShadowStackGC() : Head(nullptr), StackEntryTy(nullptr) {
   InitRoots = true;
   CustomRoots = true;
 }
@@ -381,8 +391,8 @@ bool ShadowStackGC::performCustomLowering(Function &F) {
   BasicBlock::iterator IP = F.getEntryBlock().begin();
   IRBuilder<> AtEntry(IP->getParent(), IP);
 
-  Instruction *StackEntry   = AtEntry.CreateAlloca(ConcreteStackEntryTy, 0,
-                                                   "gc_frame");
+  Instruction *StackEntry = AtEntry.CreateAlloca(ConcreteStackEntryTy, nullptr,
+                                                 "gc_frame");
 
   while (isa<AllocaInst>(IP)) ++IP;
   AtEntry.SetInsertPoint(IP->getParent(), IP);