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f1b41dd38d
There may be many invokes that share one landing pad, and the previous code
would record the landing pad once for each invoke. Besides the wasted
effort, a pair of volatile loads gets inserted every time the landing pad is
processed. The rest of the code can get optimized away when a landing pad
is processed repeatedly, but the volatile loads remain, resulting in code like:
LBB35_18:
Ltmp483:
ldr r2, [r7, #-72]
ldr r2, [r7, #-68]
ldr r2, [r7, #-72]
ldr r2, [r7, #-68]
ldr r2, [r7, #-72]
ldr r2, [r7, #-68]
ldr r2, [r7, #-72]
ldr r2, [r7, #-68]
ldr r2, [r7, #-72]
ldr r2, [r7, #-68]
ldr r2, [r7, #-72]
ldr r2, [r7, #-68]
ldr r2, [r7, #-72]
ldr r2, [r7, #-68]
ldr r2, [r7, #-72]
ldr r2, [r7, #-68]
ldr r4, [r7, #-72]
ldr r2, [r7, #-68]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144787 91177308-0d34-0410-b5e6-96231b3b80d8
495 lines
20 KiB
C++
495 lines
20 KiB
C++
//===- SjLjEHPass.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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#define DEBUG_TYPE "sjljehprepare"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Instructions.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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#include "llvm/Transforms/Utils/Local.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/IRBuilder.h"
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#include "llvm/ADT/DenseMap.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 <set>
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using namespace llvm;
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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 SjLjEHPass : public FunctionPass {
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const TargetLowering *TLI;
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Type *FunctionContextTy;
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Constant *RegisterFn;
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Constant *UnregisterFn;
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Constant *BuiltinSetjmpFn;
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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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Value *PersonalityFn;
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Constant *CallSiteFn;
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Constant *FuncCtxFn;
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Value *CallSite;
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public:
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static char ID; // Pass identification, replacement for typeid
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explicit SjLjEHPass(const TargetLowering *tli = NULL)
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: FunctionPass(ID), TLI(tli) { }
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bool doInitialization(Module &M);
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bool runOnFunction(Function &F);
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {}
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const char *getPassName() const {
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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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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, Value *CallSite);
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};
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} // end anonymous namespace
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char SjLjEHPass::ID = 0;
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// Public Interface To the SjLjEHPass pass.
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FunctionPass *llvm::createSjLjEHPass(const TargetLowering *TLI) {
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return new SjLjEHPass(TLI);
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}
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// doInitialization - Set up decalarations and types needed to process
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// exceptions.
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bool SjLjEHPass::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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FunctionContextTy =
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StructType::get(VoidPtrTy, // __prev
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Int32Ty, // call_site
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ArrayType::get(Int32Ty, 4), // __data
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VoidPtrTy, // __personality
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VoidPtrTy, // __lsda
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ArrayType::get(VoidPtrTy, 5), // __jbuf
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NULL);
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RegisterFn = M.getOrInsertFunction("_Unwind_SjLj_Register",
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Type::getVoidTy(M.getContext()),
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PointerType::getUnqual(FunctionContextTy),
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(Type *)0);
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UnregisterFn =
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M.getOrInsertFunction("_Unwind_SjLj_Unregister",
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Type::getVoidTy(M.getContext()),
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PointerType::getUnqual(FunctionContextTy),
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(Type *)0);
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FrameAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::frameaddress);
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StackAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::stacksave);
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StackRestoreFn = Intrinsic::getDeclaration(&M, Intrinsic::stackrestore);
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BuiltinSetjmpFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_setjmp);
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LSDAAddrFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_lsda);
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CallSiteFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_callsite);
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FuncCtxFn = Intrinsic::getDeclaration(&M, Intrinsic::eh_sjlj_functioncontext);
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PersonalityFn = 0;
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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 SjLjEHPass::insertCallSiteStore(Instruction *I, int Number,
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Value *CallSite) {
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ConstantInt *CallSiteNoC = ConstantInt::get(Type::getInt32Ty(I->getContext()),
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Number);
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// Insert a store of the call-site number
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new StoreInst(CallSiteNoC, CallSite, true, I); // volatile
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}
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/// MarkBlocksLiveIn - Insert BB and all of its predescessors 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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SmallPtrSet<BasicBlock*, 64> &LiveBBs) {
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if (!LiveBBs.insert(BB)) return; // already been here.
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for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
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MarkBlocksLiveIn(*PI, LiveBBs);
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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 *SjLjEHPass::
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setupFunctionContext(Function &F, ArrayRef<LandingPadInst*> LPads) {
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BasicBlock *EntryBB = F.begin();
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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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unsigned Align =
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TLI->getTargetData()->getPrefTypeAlignment(FunctionContextTy);
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AllocaInst *FuncCtx =
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new AllocaInst(FunctionContextTy, 0, Align, "fn_context", EntryBB->begin());
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// Fill in the function context structure.
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Value *Idxs[2];
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Type *Int32Ty = Type::getInt32Ty(F.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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// Keep around a reference to the call_site field.
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Idxs[0] = Zero;
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Idxs[1] = One;
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CallSite = GetElementPtrInst::Create(FuncCtx, Idxs, "call_site",
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EntryBB->getTerminator());
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// Reference the __data field.
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Idxs[1] = ConstantInt::get(Int32Ty, 2);
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Value *FCData = GetElementPtrInst::Create(FuncCtx, Idxs, "__data",
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EntryBB->getTerminator());
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// The exception value comes back in context->__data[0].
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Idxs[1] = Zero;
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Value *ExceptionAddr = GetElementPtrInst::Create(FCData, Idxs,
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"exception_gep",
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EntryBB->getTerminator());
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// The exception selector comes back in context->__data[1].
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Idxs[1] = One;
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Value *SelectorAddr = GetElementPtrInst::Create(FCData, Idxs,
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"exn_selector_gep",
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EntryBB->getTerminator());
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for (unsigned I = 0, E = LPads.size(); I != E; ++I) {
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LandingPadInst *LPI = LPads[I];
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IRBuilder<> Builder(LPI->getParent()->getFirstInsertionPt());
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Value *ExnVal = Builder.CreateLoad(ExceptionAddr, true, "exn_val");
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ExnVal = Builder.CreateIntToPtr(ExnVal, Type::getInt8PtrTy(F.getContext()));
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Value *SelVal = Builder.CreateLoad(SelectorAddr, true, "exn_selector_val");
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Type *LPadType = LPI->getType();
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Value *LPadVal = UndefValue::get(LPadType);
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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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// Personality function
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Idxs[1] = ConstantInt::get(Int32Ty, 3);
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if (!PersonalityFn)
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PersonalityFn = LPads[0]->getPersonalityFn();
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Value *PersonalityFieldPtr =
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GetElementPtrInst::Create(FuncCtx, Idxs, "pers_fn_gep",
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EntryBB->getTerminator());
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new StoreInst(PersonalityFn, PersonalityFieldPtr, true,
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EntryBB->getTerminator());
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// LSDA address
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Idxs[1] = ConstantInt::get(Int32Ty, 4);
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Value *LSDAFieldPtr = GetElementPtrInst::Create(FuncCtx, Idxs, "lsda_gep",
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EntryBB->getTerminator());
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Value *LSDA = CallInst::Create(LSDAAddrFn, "lsda_addr",
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EntryBB->getTerminator());
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new StoreInst(LSDA, LSDAFieldPtr, true, EntryBB->getTerminator());
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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 SjLjEHPass::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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isa<ConstantInt>(cast<AllocaInst>(AfterAllocaInsPt)->getArraySize()))
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++AfterAllocaInsPt;
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for (Function::arg_iterator
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AI = F.arg_begin(), AE = F.arg_end(); AI != AE; ++AI) {
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Type *Ty = AI->getType();
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// Aggregate types can't be cast, but are legal argument types, so we have
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// to handle them differently. We use an extract/insert pair as a
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// lightweight method to achieve the same goal.
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if (isa<StructType>(Ty) || isa<ArrayType>(Ty) || isa<VectorType>(Ty)) {
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Instruction *EI = ExtractValueInst::Create(AI, 0, "", AfterAllocaInsPt);
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Instruction *NI = InsertValueInst::Create(AI, EI, 0);
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NI->insertAfter(EI);
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AI->replaceAllUsesWith(NI);
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// Set the operand of the instructions back to the AllocaInst.
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EI->setOperand(0, AI);
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NI->setOperand(0, AI);
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} else {
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// This is always a no-op cast because we're casting AI to AI->getType()
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// so src and destination types are identical. BitCast is the only
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// possibility.
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CastInst *NC =
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new BitCastInst(AI, AI->getType(), AI->getName() + ".tmp",
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AfterAllocaInsPt);
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AI->replaceAllUsesWith(NC);
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// Set the operand of the cast instruction back to the AllocaInst.
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// Normally it's forbidden to replace a CastInst's operand because it
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// could cause the opcode to reflect an illegal conversion. However, we're
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// replacing it here with the same value it was constructed with. We do
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// this because the above replaceAllUsesWith() clobbered the operand, but
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// we want this one to remain.
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NC->setOperand(0, AI);
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}
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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 SjLjEHPass::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 (Function::iterator
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BB = F.begin(), BBE = F.end(); BB != BBE; ++BB) {
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for (BasicBlock::iterator
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II = BB->begin(), IIE = BB->end(); II != IIE; ++II) {
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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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Instruction *Inst = II;
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if (Inst->use_empty()) continue;
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if (Inst->hasOneUse() &&
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cast<Instruction>(Inst->use_back())->getParent() == BB &&
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!isa<PHINode>(Inst->use_back())) 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 (AllocaInst *AI = dyn_cast<AllocaInst>(Inst))
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if (isa<ConstantInt>(AI->getArraySize()) && BB == F.begin())
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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 (Value::use_iterator
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UI = Inst->use_begin(), E = Inst->use_end(); UI != E; ++UI) {
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Instruction *User = cast<Instruction>(*UI);
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if (User->getParent() != BB || isa<PHINode>(User))
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Users.push_back(User);
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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*, 64> LiveBBs;
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LiveBBs.insert(Inst->getParent());
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while (!Users.empty()) {
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Instruction *U = Users.back();
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Users.pop_back();
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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 (unsigned i = 0, e = Invokes.size(); i != e; ++i) {
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BasicBlock *UnwindBlock = Invokes[i]->getUnwindDest();
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if (UnwindBlock != BB && LiveBBs.count(UnwindBlock)) {
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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 (unsigned i = 0, e = Invokes.size(); i != e; ++i) {
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BasicBlock *UnwindBlock = Invokes[i]->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
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PN = UnwindBlock->begin(); isa<PHINode>(PN); ++PN)
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PHIsToDemote.insert(cast<PHINode>(PN));
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if (PHIsToDemote.empty()) continue;
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// Demote the PHIs to the stack.
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for (SmallPtrSet<PHINode*, 8>::iterator
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I = PHIsToDemote.begin(), E = PHIsToDemote.end(); I != E; ++I)
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DemotePHIToStack(*I);
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// Move the landingpad instruction back to the top of the landing pad block.
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LPI->moveBefore(UnwindBlock->begin());
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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 SjLjEHPass::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 (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
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if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator())) {
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Invokes.push_back(II);
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LPads.insert(II->getUnwindDest()->getLandingPadInst());
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} else if (ReturnInst *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()) 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.begin();
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Type *Int32Ty = Type::getInt32Ty(F.getContext());
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Value *Idxs[2] = {
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ConstantInt::get(Int32Ty, 0), 0
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};
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// Get a reference to the jump buffer.
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Idxs[1] = ConstantInt::get(Int32Ty, 5);
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Value *JBufPtr = GetElementPtrInst::Create(FuncCtx, Idxs, "jbuf_gep",
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EntryBB->getTerminator());
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// Save the frame pointer.
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Idxs[1] = ConstantInt::get(Int32Ty, 0);
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Value *FramePtr = GetElementPtrInst::Create(JBufPtr, Idxs, "jbuf_fp_gep",
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EntryBB->getTerminator());
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Value *Val = CallInst::Create(FrameAddrFn,
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ConstantInt::get(Int32Ty, 0),
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"fp",
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EntryBB->getTerminator());
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new StoreInst(Val, FramePtr, true, EntryBB->getTerminator());
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// Save the stack pointer.
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Idxs[1] = ConstantInt::get(Int32Ty, 2);
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Value *StackPtr = GetElementPtrInst::Create(JBufPtr, Idxs, "jbuf_sp_gep",
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EntryBB->getTerminator());
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Val = CallInst::Create(StackAddrFn, "sp", EntryBB->getTerminator());
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new StoreInst(Val, StackPtr, true, EntryBB->getTerminator());
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// Call the setjmp instrinsic. It fills in the rest of the jmpbuf.
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Value *SetjmpArg = CastInst::Create(Instruction::BitCast, JBufPtr,
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Type::getInt8PtrTy(F.getContext()), "",
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EntryBB->getTerminator());
|
|
CallInst::Create(BuiltinSetjmpFn, SetjmpArg, "", EntryBB->getTerminator());
|
|
|
|
// Store a pointer to the function context so that the back-end will know
|
|
// where to look for it.
|
|
Value *FuncCtxArg = CastInst::Create(Instruction::BitCast, FuncCtx,
|
|
Type::getInt8PtrTy(F.getContext()), "",
|
|
EntryBB->getTerminator());
|
|
CallInst::Create(FuncCtxFn, FuncCtxArg, "", EntryBB->getTerminator());
|
|
|
|
// At this point, we are all set up, update the invoke instructions to mark
|
|
// their call_site values.
|
|
for (unsigned I = 0, E = Invokes.size(); I != E; ++I) {
|
|
insertCallSiteStore(Invokes[I], I + 1, CallSite);
|
|
|
|
ConstantInt *CallSiteNum =
|
|
ConstantInt::get(Type::getInt32Ty(F.getContext()), I + 1);
|
|
|
|
// Record the call site value for the back end so it stays associated with
|
|
// the invoke.
|
|
CallInst::Create(CallSiteFn, CallSiteNum, "", Invokes[I]);
|
|
}
|
|
|
|
// Mark call instructions that aren't nounwind as no-action (call_site ==
|
|
// -1). Skip the entry block, as prior to then, no function context has been
|
|
// created for this function and any unexpected exceptions thrown will go
|
|
// directly to the caller's context, which is what we want anyway, so no need
|
|
// to do anything here.
|
|
for (Function::iterator BB = F.begin(), E = F.end(); ++BB != E;)
|
|
for (BasicBlock::iterator I = BB->begin(), end = BB->end(); I != end; ++I)
|
|
if (CallInst *CI = dyn_cast<CallInst>(I)) {
|
|
if (!CI->doesNotThrow())
|
|
insertCallSiteStore(CI, -1, CallSite);
|
|
} else if (ResumeInst *RI = dyn_cast<ResumeInst>(I)) {
|
|
insertCallSiteStore(RI, -1, CallSite);
|
|
}
|
|
|
|
// Register the function context and make sure it's known to not throw
|
|
CallInst *Register = CallInst::Create(RegisterFn, FuncCtx, "",
|
|
EntryBB->getTerminator());
|
|
Register->setDoesNotThrow();
|
|
|
|
// Following any allocas not in the entry block, update the saved SP in the
|
|
// jmpbuf to the new value.
|
|
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
|
|
if (BB == F.begin())
|
|
continue;
|
|
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
|
|
if (CallInst *CI = dyn_cast<CallInst>(I)) {
|
|
if (CI->getCalledFunction() != StackRestoreFn)
|
|
continue;
|
|
} else if (!isa<AllocaInst>(I)) {
|
|
continue;
|
|
}
|
|
Instruction *StackAddr = CallInst::Create(StackAddrFn, "sp");
|
|
StackAddr->insertAfter(I);
|
|
Instruction *StoreStackAddr = new StoreInst(StackAddr, StackPtr, true);
|
|
StoreStackAddr->insertAfter(StackAddr);
|
|
}
|
|
}
|
|
|
|
// Finally, for any returns from this function, if this function contains an
|
|
// invoke, add a call to unregister the function context.
|
|
for (unsigned I = 0, E = Returns.size(); I != E; ++I)
|
|
CallInst::Create(UnregisterFn, FuncCtx, "", Returns[I]);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool SjLjEHPass::runOnFunction(Function &F) {
|
|
bool Res = setupEntryBlockAndCallSites(F);
|
|
return Res;
|
|
}
|