//
//===----------------------------------------------------------------------===//
-#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 {
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);
Constant *GetFrameMap(Function &F);
- const Type* GetConcreteStackEntryType(Function &F);
+ Type* GetConcreteStackEntryType(Function &F);
void CollectRoots(Function &F);
static GetElementPtrInst *CreateGEP(LLVMContext &Context,
IRBuilder<> &B, Value *BasePtr,
IRBuilder<> *Next() {
switch (State) {
default:
- return 0;
+ return nullptr;
case 0:
StateBB = F.begin();
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 and return do.
+ // Branches and invokes do not escape, only unwind, resume, and return
+ // do.
TerminatorInst *TI = CurBB->getTerminator();
- if (!isa<UnwindInst>(TI) && !isa<ReturnInst>(TI))
+ if (!isa<ReturnInst>(TI) && !isa<ResumeInst>(TI))
continue;
Builder.SetInsertPoint(TI->getParent(), TI);
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), nullptr);
+ 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.
InvokeInst *II = InvokeInst::Create(CI->getCalledValue(),
NewBB, CleanupBB,
- Args.begin(), Args.end(),
- CI->getName(), CallBB);
+ Args, CI->getName(), CallBB);
II->setCallingConv(CI->getCallingConv());
II->setAttributes(CI->getAttributes());
CI->replaceAllUsesWith(II);
delete CI;
}
- Builder.SetInsertPoint(UI->getParent(), UI);
+ Builder.SetInsertPoint(RI->getParent(), RI);
return &Builder;
}
}
void llvm::linkShadowStackGC() { }
-ShadowStackGC::ShadowStackGC() : Head(0), StackEntryTy(0) {
+ShadowStackGC::ShadowStackGC() : Head(nullptr), StackEntryTy(nullptr) {
InitRoots = true;
CustomRoots = true;
}
Constant *ShadowStackGC::GetFrameMap(Function &F) {
// doInitialization creates the abstract type of this value.
- const Type *VoidPtr = Type::getInt8PtrTy(F.getContext());
+ Type *VoidPtr = Type::getInt8PtrTy(F.getContext());
// Truncate the ShadowStackDescriptor if some metadata is null.
unsigned NumMeta = 0;
}
Metadata.resize(NumMeta);
- const Type *Int32Ty = Type::getInt32Ty(F.getContext());
+ Type *Int32Ty = Type::getInt32Ty(F.getContext());
Constant *BaseElts[] = {
ConstantInt::get(Int32Ty, Roots.size(), false),
};
Type *EltTys[] = { DescriptorElts[0]->getType(),DescriptorElts[1]->getType()};
- StructType *STy = StructType::createNamed("gc_map."+utostr(NumMeta), EltTys);
+ StructType *STy = StructType::create(EltTys, "gc_map."+utostr(NumMeta));
Constant *FrameMap = ConstantStruct::get(STy, DescriptorElts);
ConstantInt::get(Type::getInt32Ty(F.getContext()), 0),
ConstantInt::get(Type::getInt32Ty(F.getContext()), 0)
};
- return ConstantExpr::getGetElementPtr(GV, GEPIndices, 2);
+ return ConstantExpr::getGetElementPtr(GV, GEPIndices);
}
-const Type* ShadowStackGC::GetConcreteStackEntryType(Function &F) {
+Type* ShadowStackGC::GetConcreteStackEntryType(Function &F) {
// doInitialization creates the generic version of this type.
std::vector<Type*> EltTys;
EltTys.push_back(StackEntryTy);
for (size_t I = 0; I != Roots.size(); I++)
EltTys.push_back(Roots[I].second->getAllocatedType());
- return StructType::createNamed("gc_stackentry."+F.getName().str(), EltTys);
+ return StructType::create(EltTys, "gc_stackentry."+F.getName().str());
}
/// doInitialization - If this module uses the GC intrinsics, find them now. If
EltTys.push_back(Type::getInt32Ty(M.getContext()));
// Specifies length of variable length array.
EltTys.push_back(Type::getInt32Ty(M.getContext()));
- FrameMapTy = StructType::createNamed("gc_map", EltTys);
+ FrameMapTy = StructType::create(EltTys, "gc_map");
PointerType *FrameMapPtrTy = PointerType::getUnqual(FrameMapTy);
// struct StackEntry {
// void *Roots[]; // Stack roots (in-place array, so we pretend).
// };
- StackEntryTy = StructType::createNamed(M.getContext(), "gc_stackentry");
+ StackEntryTy = StructType::create(M.getContext(), "gc_stackentry");
EltTys.clear();
EltTys.push_back(PointerType::getUnqual(StackEntryTy));
EltTys.push_back(FrameMapPtrTy);
StackEntryTy->setBody(EltTys);
- const PointerType *StackEntryPtrTy = PointerType::getUnqual(StackEntryTy);
+ PointerType *StackEntryPtrTy = PointerType::getUnqual(StackEntryTy);
// Get the root chain if it already exists.
Head = M.getGlobalVariable("llvm_gc_root_chain");
Value *Indices[] = { ConstantInt::get(Type::getInt32Ty(Context), 0),
ConstantInt::get(Type::getInt32Ty(Context), Idx),
ConstantInt::get(Type::getInt32Ty(Context), Idx2) };
- Value* Val = B.CreateGEP(BasePtr, Indices, Indices + 3, Name);
+ Value* Val = B.CreateGEP(BasePtr, Indices, Name);
assert(isa<GetElementPtrInst>(Val) && "Unexpected folded constant");
int Idx, const char *Name) {
Value *Indices[] = { ConstantInt::get(Type::getInt32Ty(Context), 0),
ConstantInt::get(Type::getInt32Ty(Context), Idx) };
- Value *Val = B.CreateGEP(BasePtr, Indices, Indices + 2, Name);
+ Value *Val = B.CreateGEP(BasePtr, Indices, Name);
assert(isa<GetElementPtrInst>(Val) && "Unexpected folded constant");
// Build the constant map and figure the type of the shadow stack entry.
Value *FrameMap = GetFrameMap(F);
- const Type *ConcreteStackEntryTy = GetConcreteStackEntryType(F);
+ Type *ConcreteStackEntryTy = GetConcreteStackEntryType(F);
// Build the shadow stack entry at the very start of the function.
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);
projects / oota-llvm.git / blobdiff