forked from OSchip/llvm-project
503 lines
19 KiB
C++
503 lines
19 KiB
C++
//===- SjLjEHPrepare.cpp - Eliminate Invoke & Unwind instructions ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This transformation is designed for use by code generators which use SjLj
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// based exception handling.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Utils/Local.h"
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using namespace llvm;
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#define DEBUG_TYPE "sjljehprepare"
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STATISTIC(NumInvokes, "Number of invokes replaced");
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STATISTIC(NumSpilled, "Number of registers live across unwind edges");
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namespace {
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class SjLjEHPrepare : public FunctionPass {
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Type *doubleUnderDataTy;
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Type *doubleUnderJBufTy;
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Type *FunctionContextTy;
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Constant *RegisterFn;
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Constant *UnregisterFn;
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Constant *BuiltinSetupDispatchFn;
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Constant *FrameAddrFn;
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Constant *StackAddrFn;
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Constant *StackRestoreFn;
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Constant *LSDAAddrFn;
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Constant *CallSiteFn;
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Constant *FuncCtxFn;
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AllocaInst *FuncCtx;
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public:
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static char ID; // Pass identification, replacement for typeid
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explicit SjLjEHPrepare() : FunctionPass(ID) {}
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bool doInitialization(Module &M) override;
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bool runOnFunction(Function &F) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override {}
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StringRef getPassName() const override {
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return "SJLJ Exception Handling preparation";
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}
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private:
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bool setupEntryBlockAndCallSites(Function &F);
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bool undoSwiftErrorSelect(Function &F);
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void substituteLPadValues(LandingPadInst *LPI, Value *ExnVal, Value *SelVal);
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Value *setupFunctionContext(Function &F, ArrayRef<LandingPadInst *> LPads);
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void lowerIncomingArguments(Function &F);
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void lowerAcrossUnwindEdges(Function &F, ArrayRef<InvokeInst *> Invokes);
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void insertCallSiteStore(Instruction *I, int Number);
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};
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} // end anonymous namespace
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char SjLjEHPrepare::ID = 0;
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INITIALIZE_PASS(SjLjEHPrepare, "sjljehprepare", "Prepare SjLj exceptions",
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false, false)
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// Public Interface To the SjLjEHPrepare pass.
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FunctionPass *llvm::createSjLjEHPreparePass() { return new SjLjEHPrepare(); }
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// doInitialization - Set up decalarations and types needed to process
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// exceptions.
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bool SjLjEHPrepare::doInitialization(Module &M) {
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// Build the function context structure.
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// builtin_setjmp uses a five word jbuf
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Type *VoidPtrTy = Type::getInt8PtrTy(M.getContext());
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Type *Int32Ty = Type::getInt32Ty(M.getContext());
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doubleUnderDataTy = ArrayType::get(Int32Ty, 4);
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doubleUnderJBufTy = ArrayType::get(VoidPtrTy, 5);
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FunctionContextTy = StructType::get(VoidPtrTy, // __prev
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Int32Ty, // call_site
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doubleUnderDataTy, // __data
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VoidPtrTy, // __personality
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VoidPtrTy, // __lsda
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doubleUnderJBufTy, // __jbuf
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nullptr);
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return true;
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}
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/// insertCallSiteStore - Insert a store of the call-site value to the
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/// function context
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void SjLjEHPrepare::insertCallSiteStore(Instruction *I, int Number) {
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IRBuilder<> Builder(I);
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// Get a reference to the call_site field.
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Type *Int32Ty = Type::getInt32Ty(I->getContext());
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Value *Zero = ConstantInt::get(Int32Ty, 0);
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Value *One = ConstantInt::get(Int32Ty, 1);
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Value *Idxs[2] = { Zero, One };
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Value *CallSite =
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Builder.CreateGEP(FunctionContextTy, FuncCtx, Idxs, "call_site");
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// Insert a store of the call-site number
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ConstantInt *CallSiteNoC =
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ConstantInt::get(Type::getInt32Ty(I->getContext()), Number);
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Builder.CreateStore(CallSiteNoC, CallSite, true /*volatile*/);
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}
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/// MarkBlocksLiveIn - Insert BB and all of its predecessors into LiveBBs until
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/// we reach blocks we've already seen.
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static void MarkBlocksLiveIn(BasicBlock *BB,
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SmallPtrSetImpl<BasicBlock *> &LiveBBs) {
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if (!LiveBBs.insert(BB).second)
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return; // already been here.
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for (BasicBlock *PredBB : predecessors(BB))
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MarkBlocksLiveIn(PredBB, LiveBBs);
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}
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/// substituteLPadValues - Substitute the values returned by the landingpad
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/// instruction with those returned by the personality function.
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void SjLjEHPrepare::substituteLPadValues(LandingPadInst *LPI, Value *ExnVal,
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Value *SelVal) {
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SmallVector<Value *, 8> UseWorkList(LPI->user_begin(), LPI->user_end());
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while (!UseWorkList.empty()) {
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Value *Val = UseWorkList.pop_back_val();
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auto *EVI = dyn_cast<ExtractValueInst>(Val);
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if (!EVI)
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continue;
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if (EVI->getNumIndices() != 1)
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continue;
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if (*EVI->idx_begin() == 0)
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EVI->replaceAllUsesWith(ExnVal);
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else if (*EVI->idx_begin() == 1)
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EVI->replaceAllUsesWith(SelVal);
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if (EVI->use_empty())
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EVI->eraseFromParent();
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}
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if (LPI->use_empty())
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return;
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// There are still some uses of LPI. Construct an aggregate with the exception
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// values and replace the LPI with that aggregate.
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Type *LPadType = LPI->getType();
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Value *LPadVal = UndefValue::get(LPadType);
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auto *SelI = cast<Instruction>(SelVal);
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IRBuilder<> Builder(SelI->getParent(), std::next(SelI->getIterator()));
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LPadVal = Builder.CreateInsertValue(LPadVal, ExnVal, 0, "lpad.val");
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LPadVal = Builder.CreateInsertValue(LPadVal, SelVal, 1, "lpad.val");
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LPI->replaceAllUsesWith(LPadVal);
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}
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/// setupFunctionContext - Allocate the function context on the stack and fill
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/// it with all of the data that we know at this point.
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Value *SjLjEHPrepare::setupFunctionContext(Function &F,
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ArrayRef<LandingPadInst *> LPads) {
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BasicBlock *EntryBB = &F.front();
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// Create an alloca for the incoming jump buffer ptr and the new jump buffer
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// that needs to be restored on all exits from the function. This is an alloca
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// because the value needs to be added to the global context list.
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auto &DL = F.getParent()->getDataLayout();
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unsigned Align = DL.getPrefTypeAlignment(FunctionContextTy);
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FuncCtx = new AllocaInst(FunctionContextTy, nullptr, Align, "fn_context",
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&EntryBB->front());
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// Fill in the function context structure.
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for (LandingPadInst *LPI : LPads) {
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IRBuilder<> Builder(LPI->getParent(),
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LPI->getParent()->getFirstInsertionPt());
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// Reference the __data field.
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Value *FCData =
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Builder.CreateConstGEP2_32(FunctionContextTy, FuncCtx, 0, 2, "__data");
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// The exception values come back in context->__data[0].
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Value *ExceptionAddr = Builder.CreateConstGEP2_32(doubleUnderDataTy, FCData,
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0, 0, "exception_gep");
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Value *ExnVal = Builder.CreateLoad(ExceptionAddr, true, "exn_val");
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ExnVal = Builder.CreateIntToPtr(ExnVal, Builder.getInt8PtrTy());
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Value *SelectorAddr = Builder.CreateConstGEP2_32(doubleUnderDataTy, FCData,
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0, 1, "exn_selector_gep");
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Value *SelVal = Builder.CreateLoad(SelectorAddr, true, "exn_selector_val");
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substituteLPadValues(LPI, ExnVal, SelVal);
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}
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// Personality function
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IRBuilder<> Builder(EntryBB->getTerminator());
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Value *PersonalityFn = F.getPersonalityFn();
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Value *PersonalityFieldPtr = Builder.CreateConstGEP2_32(
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FunctionContextTy, FuncCtx, 0, 3, "pers_fn_gep");
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Builder.CreateStore(
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Builder.CreateBitCast(PersonalityFn, Builder.getInt8PtrTy()),
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PersonalityFieldPtr, /*isVolatile=*/true);
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// LSDA address
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Value *LSDA = Builder.CreateCall(LSDAAddrFn, {}, "lsda_addr");
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Value *LSDAFieldPtr =
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Builder.CreateConstGEP2_32(FunctionContextTy, FuncCtx, 0, 4, "lsda_gep");
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Builder.CreateStore(LSDA, LSDAFieldPtr, /*isVolatile=*/true);
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return FuncCtx;
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}
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/// lowerIncomingArguments - To avoid having to handle incoming arguments
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/// specially, we lower each arg to a copy instruction in the entry block. This
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/// ensures that the argument value itself cannot be live out of the entry
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/// block.
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void SjLjEHPrepare::lowerIncomingArguments(Function &F) {
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BasicBlock::iterator AfterAllocaInsPt = F.begin()->begin();
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while (isa<AllocaInst>(AfterAllocaInsPt) &&
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cast<AllocaInst>(AfterAllocaInsPt)->isStaticAlloca())
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++AfterAllocaInsPt;
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assert(AfterAllocaInsPt != F.front().end());
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for (auto &AI : F.args()) {
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Type *Ty = AI.getType();
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// Use 'select i8 true, %arg, undef' to simulate a 'no-op' instruction.
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Value *TrueValue = ConstantInt::getTrue(F.getContext());
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Value *UndefValue = UndefValue::get(Ty);
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Instruction *SI = SelectInst::Create(
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TrueValue, &AI, UndefValue, AI.getName() + ".tmp", &*AfterAllocaInsPt);
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AI.replaceAllUsesWith(SI);
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// Reset the operand, because it was clobbered by the RAUW above.
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SI->setOperand(1, &AI);
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}
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}
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/// lowerAcrossUnwindEdges - Find all variables which are alive across an unwind
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/// edge and spill them.
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void SjLjEHPrepare::lowerAcrossUnwindEdges(Function &F,
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ArrayRef<InvokeInst *> Invokes) {
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// Finally, scan the code looking for instructions with bad live ranges.
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for (BasicBlock &BB : F) {
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for (Instruction &Inst : BB) {
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// Ignore obvious cases we don't have to handle. In particular, most
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// instructions either have no uses or only have a single use inside the
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// current block. Ignore them quickly.
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if (Inst.use_empty())
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continue;
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if (Inst.hasOneUse() &&
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cast<Instruction>(Inst.user_back())->getParent() == &BB &&
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!isa<PHINode>(Inst.user_back()))
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continue;
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// If this is an alloca in the entry block, it's not a real register
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// value.
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if (auto *AI = dyn_cast<AllocaInst>(&Inst))
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if (AI->isStaticAlloca())
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continue;
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// Avoid iterator invalidation by copying users to a temporary vector.
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SmallVector<Instruction *, 16> Users;
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for (User *U : Inst.users()) {
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Instruction *UI = cast<Instruction>(U);
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if (UI->getParent() != &BB || isa<PHINode>(UI))
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Users.push_back(UI);
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}
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// Find all of the blocks that this value is live in.
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SmallPtrSet<BasicBlock *, 32> LiveBBs;
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LiveBBs.insert(&BB);
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while (!Users.empty()) {
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Instruction *U = Users.pop_back_val();
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if (!isa<PHINode>(U)) {
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MarkBlocksLiveIn(U->getParent(), LiveBBs);
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} else {
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// Uses for a PHI node occur in their predecessor block.
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PHINode *PN = cast<PHINode>(U);
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for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
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if (PN->getIncomingValue(i) == &Inst)
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MarkBlocksLiveIn(PN->getIncomingBlock(i), LiveBBs);
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}
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}
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// Now that we know all of the blocks that this thing is live in, see if
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// it includes any of the unwind locations.
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bool NeedsSpill = false;
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for (InvokeInst *Invoke : Invokes) {
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BasicBlock *UnwindBlock = Invoke->getUnwindDest();
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if (UnwindBlock != &BB && LiveBBs.count(UnwindBlock)) {
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DEBUG(dbgs() << "SJLJ Spill: " << Inst << " around "
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<< UnwindBlock->getName() << "\n");
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NeedsSpill = true;
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break;
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}
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}
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// If we decided we need a spill, do it.
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// FIXME: Spilling this way is overkill, as it forces all uses of
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// the value to be reloaded from the stack slot, even those that aren't
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// in the unwind blocks. We should be more selective.
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if (NeedsSpill) {
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DemoteRegToStack(Inst, true);
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++NumSpilled;
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}
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}
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}
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// Go through the landing pads and remove any PHIs there.
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for (InvokeInst *Invoke : Invokes) {
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BasicBlock *UnwindBlock = Invoke->getUnwindDest();
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LandingPadInst *LPI = UnwindBlock->getLandingPadInst();
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// Place PHIs into a set to avoid invalidating the iterator.
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SmallPtrSet<PHINode *, 8> PHIsToDemote;
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for (BasicBlock::iterator PN = UnwindBlock->begin(); isa<PHINode>(PN); ++PN)
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PHIsToDemote.insert(cast<PHINode>(PN));
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if (PHIsToDemote.empty())
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continue;
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// Demote the PHIs to the stack.
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for (PHINode *PN : PHIsToDemote)
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DemotePHIToStack(PN);
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// Move the landingpad instruction back to the top of the landing pad block.
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LPI->moveBefore(&UnwindBlock->front());
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}
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}
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/// setupEntryBlockAndCallSites - Setup the entry block by creating and filling
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/// the function context and marking the call sites with the appropriate
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/// values. These values are used by the DWARF EH emitter.
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bool SjLjEHPrepare::setupEntryBlockAndCallSites(Function &F) {
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SmallVector<ReturnInst *, 16> Returns;
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SmallVector<InvokeInst *, 16> Invokes;
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SmallSetVector<LandingPadInst *, 16> LPads;
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// Look through the terminators of the basic blocks to find invokes.
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for (BasicBlock &BB : F)
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if (auto *II = dyn_cast<InvokeInst>(BB.getTerminator())) {
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if (Function *Callee = II->getCalledFunction())
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if (Callee->getIntrinsicID() == Intrinsic::donothing) {
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// Remove the NOP invoke.
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BranchInst::Create(II->getNormalDest(), II);
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II->eraseFromParent();
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continue;
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}
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Invokes.push_back(II);
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LPads.insert(II->getUnwindDest()->getLandingPadInst());
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} else if (auto *RI = dyn_cast<ReturnInst>(BB.getTerminator())) {
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Returns.push_back(RI);
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}
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if (Invokes.empty())
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return false;
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NumInvokes += Invokes.size();
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lowerIncomingArguments(F);
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lowerAcrossUnwindEdges(F, Invokes);
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Value *FuncCtx =
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setupFunctionContext(F, makeArrayRef(LPads.begin(), LPads.end()));
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BasicBlock *EntryBB = &F.front();
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IRBuilder<> Builder(EntryBB->getTerminator());
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// Get a reference to the jump buffer.
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Value *JBufPtr =
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Builder.CreateConstGEP2_32(FunctionContextTy, FuncCtx, 0, 5, "jbuf_gep");
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// Save the frame pointer.
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Value *FramePtr = Builder.CreateConstGEP2_32(doubleUnderJBufTy, JBufPtr, 0, 0,
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"jbuf_fp_gep");
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Value *Val = Builder.CreateCall(FrameAddrFn, Builder.getInt32(0), "fp");
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Builder.CreateStore(Val, FramePtr, /*isVolatile=*/true);
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// Save the stack pointer.
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Value *StackPtr = Builder.CreateConstGEP2_32(doubleUnderJBufTy, JBufPtr, 0, 2,
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"jbuf_sp_gep");
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Val = Builder.CreateCall(StackAddrFn, {}, "sp");
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Builder.CreateStore(Val, StackPtr, /*isVolatile=*/true);
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// Call the setup_dispatch instrinsic. It fills in the rest of the jmpbuf.
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Builder.CreateCall(BuiltinSetupDispatchFn, {});
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// Store a pointer to the function context so that the back-end will know
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// where to look for it.
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Value *FuncCtxArg = Builder.CreateBitCast(FuncCtx, Builder.getInt8PtrTy());
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Builder.CreateCall(FuncCtxFn, FuncCtxArg);
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// At this point, we are all set up, update the invoke instructions to mark
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// their call_site values.
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for (unsigned I = 0, E = Invokes.size(); I != E; ++I) {
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insertCallSiteStore(Invokes[I], I + 1);
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ConstantInt *CallSiteNum =
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ConstantInt::get(Type::getInt32Ty(F.getContext()), I + 1);
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// Record the call site value for the back end so it stays associated with
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// the invoke.
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CallInst::Create(CallSiteFn, CallSiteNum, "", Invokes[I]);
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}
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// Mark call instructions that aren't nounwind as no-action (call_site ==
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// -1). Skip the entry block, as prior to then, no function context has been
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// created for this function and any unexpected exceptions thrown will go
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// directly to the caller's context, which is what we want anyway, so no need
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// to do anything here.
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for (BasicBlock &BB : F) {
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if (&BB == &F.front())
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continue;
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for (Instruction &I : BB)
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if (I.mayThrow())
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insertCallSiteStore(&I, -1);
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}
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// Register the function context and make sure it's known to not throw
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CallInst *Register =
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CallInst::Create(RegisterFn, FuncCtx, "", EntryBB->getTerminator());
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Register->setDoesNotThrow();
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// Following any allocas not in the entry block, update the saved SP in the
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// jmpbuf to the new value.
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for (BasicBlock &BB : F) {
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if (&BB == &F.front())
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continue;
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for (Instruction &I : BB) {
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if (auto *CI = dyn_cast<CallInst>(&I)) {
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if (CI->getCalledFunction() != StackRestoreFn)
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continue;
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} else if (!isa<AllocaInst>(&I)) {
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continue;
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}
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Instruction *StackAddr = CallInst::Create(StackAddrFn, "sp");
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StackAddr->insertAfter(&I);
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Instruction *StoreStackAddr = new StoreInst(StackAddr, StackPtr, true);
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StoreStackAddr->insertAfter(StackAddr);
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}
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}
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// Finally, for any returns from this function, if this function contains an
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// invoke, add a call to unregister the function context.
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for (ReturnInst *Return : Returns)
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CallInst::Create(UnregisterFn, FuncCtx, "", Return);
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return true;
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}
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bool SjLjEHPrepare::undoSwiftErrorSelect(Function &F) {
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// We have inserted dummy copies 'select true, arg, undef' in the entry block
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// for arguments to simplify this pass.
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// swifterror arguments cannot be used in this way. Undo the select for the
|
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// swifterror argument.
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for (auto &AI : F.args()) {
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if (AI.isSwiftError()) {
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assert(AI.hasOneUse() && "Must have converted the argument to a select");
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auto *Select = dyn_cast<SelectInst>(AI.use_begin()->getUser());
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assert(Select && "There must be single select user");
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|
auto *OrigSwiftError = cast<Argument>(Select->getTrueValue());
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Select->replaceAllUsesWith(OrigSwiftError);
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|
Select->eraseFromParent();
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|
return true;
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|
}
|
|
}
|
|
return false;
|
|
}
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|
|
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bool SjLjEHPrepare::runOnFunction(Function &F) {
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|
Module &M = *F.getParent();
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|
RegisterFn = M.getOrInsertFunction(
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|
"_Unwind_SjLj_Register", Type::getVoidTy(M.getContext()),
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PointerType::getUnqual(FunctionContextTy), nullptr);
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|
UnregisterFn = M.getOrInsertFunction(
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|
"_Unwind_SjLj_Unregister", Type::getVoidTy(M.getContext()),
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|
PointerType::getUnqual(FunctionContextTy), nullptr);
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|
FrameAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::frameaddress);
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|
StackAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::stacksave);
|
|
StackRestoreFn = Intrinsic::getDeclaration(&M, Intrinsic::stackrestore);
|
|
BuiltinSetupDispatchFn =
|
|
Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_setup_dispatch);
|
|
LSDAAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_lsda);
|
|
CallSiteFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_callsite);
|
|
FuncCtxFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_functioncontext);
|
|
|
|
bool Res = setupEntryBlockAndCallSites(F);
|
|
if (Res)
|
|
Res |= undoSwiftErrorSelect(F);
|
|
return Res;
|
|
}
|