forked from OSchip/llvm-project
Early exit if we don't have invokes. The 'Unwinds' vector isn't modified unless
we have invokes, so there is no functionality change here. llvm-svn: 122990
This commit is contained in:
Bill Wendling
parent
db59823068
commit
34e2bc0f08
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@ -319,8 +319,12 @@ bool SjLjEHPass::insertSjLjEHSupport(Function &F) {
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Unwinds.push_back(UI);
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}
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}
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// If we don't have any invokes or unwinds, there's nothing to do.
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if (Unwinds.empty() && Invokes.empty()) return false;
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NumInvokes += Invokes.size();
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NumUnwinds += Unwinds.size();
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// If we don't have any invokes, there's nothing to do.
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if (Invokes.empty()) return false;
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// Find the eh.selector.*, eh.exception and alloca calls.
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//
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@ -334,6 +338,7 @@ bool SjLjEHPass::insertSjLjEHSupport(Function &F) {
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SmallVector<CallInst*,16> EH_Selectors;
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SmallVector<CallInst*,16> EH_Exceptions;
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SmallVector<Instruction*,16> JmpbufUpdatePoints;
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// Note: Skip the entry block since there's nothing there that interests
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// us. eh.selector and eh.exception shouldn't ever be there, and we
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// want to disregard any allocas that are there.
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@ -353,236 +358,231 @@ bool SjLjEHPass::insertSjLjEHSupport(Function &F) {
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}
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}
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}
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// If we don't have any eh.selector calls, we can't determine the personality
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// function. Without a personality function, we can't process exceptions.
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if (!PersonalityFn) return false;
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NumInvokes += Invokes.size();
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NumUnwinds += Unwinds.size();
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// We have invokes, so we need to add register/unregister calls to get this
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// function onto the global unwind stack.
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//
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// First thing we need to do is scan the whole function for values that are
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// live across unwind edges. Each value that is live across an unwind edge we
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// spill into a stack location, guaranteeing that there is nothing live across
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// the unwind edge. This process also splits all critical edges coming out of
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// invoke's.
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splitLiveRangesAcrossInvokes(Invokes);
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if (!Invokes.empty()) {
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// We have invokes, so we need to add register/unregister calls to get
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// this function onto the global unwind stack.
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//
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// First thing we need to do is scan the whole function for values that are
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// live across unwind edges. Each value that is live across an unwind edge
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// we spill into a stack location, guaranteeing that there is nothing live
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// across the unwind edge. This process also splits all critical edges
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// coming out of invoke's.
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splitLiveRangesAcrossInvokes(Invokes);
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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
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// alloca because the value needs to be added to the global context list.
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unsigned Align = 4; // FIXME: Should be a TLI check?
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AllocaInst *FunctionContext =
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new AllocaInst(FunctionContextTy, 0, Align,
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"fcn_context", F.begin()->begin());
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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
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// alloca because the value needs to be added to the global context list.
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unsigned Align = 4; // FIXME: Should be a TLI check?
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AllocaInst *FunctionContext =
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new AllocaInst(FunctionContextTy, 0, Align,
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"fcn_context", F.begin()->begin());
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Value *Idxs[2];
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const Type *Int32Ty = Type::getInt32Ty(F.getContext());
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Value *Zero = ConstantInt::get(Int32Ty, 0);
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// We need to also keep around a reference to the call_site field
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Idxs[0] = Zero;
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Idxs[1] = ConstantInt::get(Int32Ty, 1);
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CallSite = GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"call_site",
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EntryBB->getTerminator());
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Value *Idxs[2];
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const Type *Int32Ty = Type::getInt32Ty(F.getContext());
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Value *Zero = ConstantInt::get(Int32Ty, 0);
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// We need to also keep around a reference to the call_site field
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Idxs[0] = Zero;
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Idxs[1] = ConstantInt::get(Int32Ty, 1);
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CallSite = GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"call_site",
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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] = ConstantInt::get(Int32Ty, 2);
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Value *FCData = GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"fc_data",
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EntryBB->getTerminator());
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Idxs[1] = ConstantInt::get(Int32Ty, 1);
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Value *SelectorAddr = GetElementPtrInst::Create(FCData, Idxs, Idxs+2,
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"exc_selector_gep",
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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, Idxs+2,
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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] = ConstantInt::get(Int32Ty, 2);
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Value *FCData = GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"fc_data",
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EntryBB->getTerminator());
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Idxs[1] = ConstantInt::get(Int32Ty, 1);
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Value *SelectorAddr = GetElementPtrInst::Create(FCData, Idxs, Idxs+2,
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"exc_selector_gep",
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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, Idxs+2,
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"exception_gep",
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EntryBB->getTerminator());
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// The result of the eh.selector call will be replaced with a
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// a reference to the selector value returned in the function
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// context. We leave the selector itself so the EH analysis later
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// can use it.
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for (int i = 0, e = EH_Selectors.size(); i < e; ++i) {
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CallInst *I = EH_Selectors[i];
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Value *SelectorVal = new LoadInst(SelectorAddr, "select_val", true, I);
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I->replaceAllUsesWith(SelectorVal);
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}
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// eh.exception calls are replaced with references to the proper
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// location in the context. Unlike eh.selector, the eh.exception
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// calls are removed entirely.
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for (int i = 0, e = EH_Exceptions.size(); i < e; ++i) {
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CallInst *I = EH_Exceptions[i];
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// Possible for there to be duplicates, so check to make sure
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// the instruction hasn't already been removed.
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if (!I->getParent()) continue;
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Value *Val = new LoadInst(ExceptionAddr, "exception", true, I);
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const Type *Ty = Type::getInt8PtrTy(F.getContext());
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Val = CastInst::Create(Instruction::IntToPtr, Val, Ty, "", I);
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I->replaceAllUsesWith(Val);
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I->eraseFromParent();
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}
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// The entry block changes to have the eh.sjlj.setjmp, with a conditional
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// branch to a dispatch block for non-zero returns. If we return normally,
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// we're not handling an exception and just register the function context
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// and continue.
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// Create the dispatch block. The dispatch block is basically a big switch
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// statement that goes to all of the invoke landing pads.
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BasicBlock *DispatchBlock =
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BasicBlock::Create(F.getContext(), "eh.sjlj.setjmp.catch", &F);
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// Add a call to dispatch_setup at the start of the dispatch block. This
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// is expanded to any target-specific setup that needs to be done.
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Value *SetupArg =
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CastInst::Create(Instruction::BitCast, FunctionContext,
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Type::getInt8PtrTy(F.getContext()), "",
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DispatchBlock);
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CallInst::Create(DispatchSetupFn, SetupArg, "", DispatchBlock);
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// Insert a load of the callsite in the dispatch block, and a switch on
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// its value. By default, we go to a block that just does an unwind
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// (which is the correct action for a standard call).
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BasicBlock *UnwindBlock =
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BasicBlock::Create(F.getContext(), "unwindbb", &F);
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Unwinds.push_back(new UnwindInst(F.getContext(), UnwindBlock));
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Value *DispatchLoad = new LoadInst(CallSite, "invoke.num", true,
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DispatchBlock);
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SwitchInst *DispatchSwitch =
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SwitchInst::Create(DispatchLoad, UnwindBlock, Invokes.size(),
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DispatchBlock);
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// Split the entry block to insert the conditional branch for the setjmp.
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BasicBlock *ContBlock = EntryBB->splitBasicBlock(EntryBB->getTerminator(),
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"eh.sjlj.setjmp.cont");
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// Populate the Function Context
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// 1. LSDA address
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// 2. Personality function address
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// 3. jmpbuf (save SP, FP and call eh.sjlj.setjmp)
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// LSDA address
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Idxs[0] = Zero;
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Idxs[1] = ConstantInt::get(Int32Ty, 4);
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Value *LSDAFieldPtr =
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GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"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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Idxs[1] = ConstantInt::get(Int32Ty, 3);
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Value *PersonalityFieldPtr =
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GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"lsda_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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// Save the frame pointer.
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Idxs[1] = ConstantInt::get(Int32Ty, 5);
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Value *JBufPtr
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= GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"jbuf_gep",
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EntryBB->getTerminator());
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Idxs[1] = ConstantInt::get(Int32Ty, 0);
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Value *FramePtr =
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GetElementPtrInst::Create(JBufPtr, Idxs, Idxs+2, "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 =
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GetElementPtrInst::Create(JBufPtr, Idxs, Idxs+2, "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 =
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CastInst::Create(Instruction::BitCast, JBufPtr,
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Type::getInt8PtrTy(F.getContext()), "",
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EntryBB->getTerminator());
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Value *DispatchVal = CallInst::Create(BuiltinSetjmpFn, SetjmpArg,
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"dispatch",
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EntryBB->getTerminator());
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// check the return value of the setjmp. non-zero goes to dispatcher.
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Value *IsNormal = new ICmpInst(EntryBB->getTerminator(),
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ICmpInst::ICMP_EQ, DispatchVal, Zero,
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"notunwind");
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// Nuke the uncond branch.
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EntryBB->getTerminator()->eraseFromParent();
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// Put in a new condbranch in its place.
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BranchInst::Create(ContBlock, DispatchBlock, IsNormal, EntryBB);
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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, FunctionContext, "",
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ContBlock->getTerminator());
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Register->setDoesNotThrow();
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// At this point, we are all set up, update the invoke instructions
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// to mark their call_site values, and fill in the dispatch switch
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// accordingly.
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for (unsigned i = 0, e = Invokes.size(); i != e; ++i)
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markInvokeCallSite(Invokes[i], i+1, CallSite, DispatchSwitch);
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// Mark call instructions that aren't nounwind as no-action
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// (call_site == -1). Skip the entry block, as prior to then, no function
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// context has been created for this function and any unexpected exceptions
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// thrown will go directly to the caller's context, which is what we want
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// anyway, so no need to do anything here.
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for (Function::iterator BB = F.begin(), E = F.end(); ++BB != E;) {
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for (BasicBlock::iterator I = BB->begin(), end = BB->end(); I != end; ++I)
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if (CallInst *CI = dyn_cast<CallInst>(I)) {
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// Ignore calls to the EH builtins (eh.selector, eh.exception)
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Constant *Callee = CI->getCalledFunction();
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if (Callee != SelectorFn && Callee != ExceptionFn
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&& !CI->doesNotThrow())
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insertCallSiteStore(CI, -1, CallSite);
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}
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}
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// Replace all unwinds with a branch to the unwind handler.
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// ??? Should this ever happen with sjlj exceptions?
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for (unsigned i = 0, e = Unwinds.size(); i != e; ++i) {
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BranchInst::Create(UnwindBlock, Unwinds[i]);
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Unwinds[i]->eraseFromParent();
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}
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// Following any allocas not in the entry block, update the saved SP
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// in the jmpbuf to the new value.
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for (unsigned i = 0, e = JmpbufUpdatePoints.size(); i != e; ++i) {
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Instruction *AI = JmpbufUpdatePoints[i];
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Instruction *StackAddr = CallInst::Create(StackAddrFn, "sp");
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StackAddr->insertAfter(AI);
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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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// 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 (unsigned i = 0, e = Returns.size(); i != e; ++i)
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CallInst::Create(UnregisterFn, FunctionContext, "", Returns[i]);
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// The result of the eh.selector call will be replaced with a a reference to
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// the selector value returned in the function context. We leave the selector
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// itself so the EH analysis later can use it.
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for (int i = 0, e = EH_Selectors.size(); i < e; ++i) {
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CallInst *I = EH_Selectors[i];
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Value *SelectorVal = new LoadInst(SelectorAddr, "select_val", true, I);
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I->replaceAllUsesWith(SelectorVal);
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}
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// eh.exception calls are replaced with references to the proper location in
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// the context. Unlike eh.selector, the eh.exception calls are removed
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// entirely.
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for (int i = 0, e = EH_Exceptions.size(); i < e; ++i) {
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CallInst *I = EH_Exceptions[i];
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// Possible for there to be duplicates, so check to make sure the
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// instruction hasn't already been removed.
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if (!I->getParent()) continue;
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Value *Val = new LoadInst(ExceptionAddr, "exception", true, I);
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const Type *Ty = Type::getInt8PtrTy(F.getContext());
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Val = CastInst::Create(Instruction::IntToPtr, Val, Ty, "", I);
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I->replaceAllUsesWith(Val);
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I->eraseFromParent();
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}
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// The entry block changes to have the eh.sjlj.setjmp, with a conditional
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// branch to a dispatch block for non-zero returns. If we return normally,
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// we're not handling an exception and just register the function context and
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// continue.
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// Create the dispatch block. The dispatch block is basically a big switch
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// statement that goes to all of the invoke landing pads.
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BasicBlock *DispatchBlock =
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BasicBlock::Create(F.getContext(), "eh.sjlj.setjmp.catch", &F);
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// Add a call to dispatch_setup at the start of the dispatch block. This is
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// expanded to any target-specific setup that needs to be done.
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Value *SetupArg =
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CastInst::Create(Instruction::BitCast, FunctionContext,
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Type::getInt8PtrTy(F.getContext()), "",
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DispatchBlock);
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CallInst::Create(DispatchSetupFn, SetupArg, "", DispatchBlock);
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// Insert a load of the callsite in the dispatch block, and a switch on its
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// value. By default, we go to a block that just does an unwind (which is the
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// correct action for a standard call).
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BasicBlock *UnwindBlock =
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BasicBlock::Create(F.getContext(), "unwindbb", &F);
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Unwinds.push_back(new UnwindInst(F.getContext(), UnwindBlock));
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Value *DispatchLoad = new LoadInst(CallSite, "invoke.num", true,
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DispatchBlock);
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SwitchInst *DispatchSwitch =
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SwitchInst::Create(DispatchLoad, UnwindBlock, Invokes.size(),
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DispatchBlock);
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// Split the entry block to insert the conditional branch for the setjmp.
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BasicBlock *ContBlock = EntryBB->splitBasicBlock(EntryBB->getTerminator(),
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"eh.sjlj.setjmp.cont");
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// Populate the Function Context
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// 1. LSDA address
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// 2. Personality function address
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// 3. jmpbuf (save SP, FP and call eh.sjlj.setjmp)
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// LSDA address
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Idxs[0] = Zero;
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Idxs[1] = ConstantInt::get(Int32Ty, 4);
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Value *LSDAFieldPtr =
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GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"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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Idxs[1] = ConstantInt::get(Int32Ty, 3);
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Value *PersonalityFieldPtr =
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GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"lsda_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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// Save the frame pointer.
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Idxs[1] = ConstantInt::get(Int32Ty, 5);
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Value *JBufPtr
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= GetElementPtrInst::Create(FunctionContext, Idxs, Idxs+2,
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"jbuf_gep",
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EntryBB->getTerminator());
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Idxs[1] = ConstantInt::get(Int32Ty, 0);
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Value *FramePtr =
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GetElementPtrInst::Create(JBufPtr, Idxs, Idxs+2, "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 =
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GetElementPtrInst::Create(JBufPtr, Idxs, Idxs+2, "jbuf_sp_gep",
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EntryBB->getTerminator());
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Val = CallInst::Create(StackAddrFn, "sp", EntryBB->getTerminator());
|
||||
new StoreInst(Val, StackPtr, true, EntryBB->getTerminator());
|
||||
|
||||
// Call the setjmp instrinsic. It fills in the rest of the jmpbuf.
|
||||
Value *SetjmpArg =
|
||||
CastInst::Create(Instruction::BitCast, JBufPtr,
|
||||
Type::getInt8PtrTy(F.getContext()), "",
|
||||
EntryBB->getTerminator());
|
||||
Value *DispatchVal = CallInst::Create(BuiltinSetjmpFn, SetjmpArg,
|
||||
"dispatch",
|
||||
EntryBB->getTerminator());
|
||||
// check the return value of the setjmp. non-zero goes to dispatcher.
|
||||
Value *IsNormal = new ICmpInst(EntryBB->getTerminator(),
|
||||
ICmpInst::ICMP_EQ, DispatchVal, Zero,
|
||||
"notunwind");
|
||||
// Nuke the uncond branch.
|
||||
EntryBB->getTerminator()->eraseFromParent();
|
||||
|
||||
// Put in a new condbranch in its place.
|
||||
BranchInst::Create(ContBlock, DispatchBlock, IsNormal, EntryBB);
|
||||
|
||||
// Register the function context and make sure it's known to not throw
|
||||
CallInst *Register =
|
||||
CallInst::Create(RegisterFn, FunctionContext, "",
|
||||
ContBlock->getTerminator());
|
||||
Register->setDoesNotThrow();
|
||||
|
||||
// At this point, we are all set up, update the invoke instructions to mark
|
||||
// their call_site values, and fill in the dispatch switch accordingly.
|
||||
for (unsigned i = 0, e = Invokes.size(); i != e; ++i)
|
||||
markInvokeCallSite(Invokes[i], i+1, CallSite, DispatchSwitch);
|
||||
|
||||
// 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)) {
|
||||
// Ignore calls to the EH builtins (eh.selector, eh.exception)
|
||||
Constant *Callee = CI->getCalledFunction();
|
||||
if (Callee != SelectorFn && Callee != ExceptionFn
|
||||
&& !CI->doesNotThrow())
|
||||
insertCallSiteStore(CI, -1, CallSite);
|
||||
}
|
||||
}
|
||||
|
||||
// Replace all unwinds with a branch to the unwind handler.
|
||||
// ??? Should this ever happen with sjlj exceptions?
|
||||
for (unsigned i = 0, e = Unwinds.size(); i != e; ++i) {
|
||||
BranchInst::Create(UnwindBlock, Unwinds[i]);
|
||||
Unwinds[i]->eraseFromParent();
|
||||
}
|
||||
|
||||
// Following any allocas not in the entry block, update the saved SP in the
|
||||
// jmpbuf to the new value.
|
||||
for (unsigned i = 0, e = JmpbufUpdatePoints.size(); i != e; ++i) {
|
||||
Instruction *AI = JmpbufUpdatePoints[i];
|
||||
Instruction *StackAddr = CallInst::Create(StackAddrFn, "sp");
|
||||
StackAddr->insertAfter(AI);
|
||||
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, FunctionContext, "", Returns[i]);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue