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[SEH] Emit 32-bit SEH tables for the new EH IR
The 32-bit tables don't actually contain PC range data, so emitting them is incredibly simple. The 64-bit tables, on the other hand, use the same table for state numbering as well as label ranges. This makes things more difficult, so it will be implemented later. llvm-svn: 247192
This commit is contained in:
Reid Kleckner
parent
c4e3274379
commit
40ce82e375
@ -14,9 +14,10 @@
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#ifndef LLVM_CODEGEN_WINEHFUNCINFO_H
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#define LLVM_CODEGEN_WINEHFUNCINFO_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/PointerUnion.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/TinyPtrVector.h"
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#include "llvm/ADT/DenseMap.h"
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namespace llvm {
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class AllocaInst;
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@ -120,17 +121,32 @@ struct WinEHUnwindMapEntry {
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const Value *Cleanup;
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};
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typedef PointerUnion<const BasicBlock *, MachineBasicBlock *> MBBOrBasicBlock;
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typedef PointerUnion<const Value *, MachineBasicBlock *> ValueOrMBB;
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/// Similar to WinEHUnwindMapEntry, but supports SEH filters.
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struct SEHUnwindMapEntry {
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/// If unwinding continues through this handler, transition to the handler at
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/// this state. This indexes into SEHUnwindMap.
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int ToState = -1;
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/// Holds the filter expression function.
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const Function *Filter = nullptr;
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/// Holds the __except or __finally basic block.
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MBBOrBasicBlock Handler;
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};
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struct WinEHHandlerType {
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int Adjectives;
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GlobalVariable *TypeDescriptor;
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int CatchObjRecoverIdx;
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const Value *Handler;
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MachineBasicBlock *HandlerMBB;
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ValueOrMBB Handler;
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};
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struct WinEHTryBlockMapEntry {
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int TryLow;
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int TryHigh;
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int TryLow = -1;
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int TryHigh = -1;
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int CatchHigh = -1;
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SmallVector<WinEHHandlerType, 1> HandlerArray;
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};
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@ -147,6 +163,7 @@ struct WinEHFuncInfo {
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DenseMap<const Function *, int> HandlerBaseState;
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SmallVector<WinEHUnwindMapEntry, 4> UnwindMap;
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SmallVector<WinEHTryBlockMapEntry, 4> TryBlockMap;
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SmallVector<SEHUnwindMapEntry, 4> SEHUnwindMap;
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SmallVector<std::pair<MCSymbol *, int>, 4> IPToStateList;
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int UnwindHelpFrameIdx = INT_MAX;
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int UnwindHelpFrameOffset = -1;
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@ -169,5 +186,7 @@ struct WinEHFuncInfo {
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void calculateWinCXXEHStateNumbers(const Function *ParentFn,
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WinEHFuncInfo &FuncInfo);
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void calculateSEHStateNumbers(const Function *ParentFn,
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WinEHFuncInfo &FuncInfo);
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}
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#endif // LLVM_CODEGEN_WINEHFUNCINFO_H
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@ -161,7 +161,7 @@ void WinException::endFunction(const MachineFunction *MF) {
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// Emit the tables appropriate to the personality function in use. If we
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// don't recognize the personality, assume it uses an Itanium-style LSDA.
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if (Per == EHPersonality::MSVC_Win64SEH)
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emitCSpecificHandlerTable();
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emitCSpecificHandlerTable(MF);
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else if (Per == EHPersonality::MSVC_X86SEH)
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emitExceptHandlerTable(MF);
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else if (Per == EHPersonality::MSVC_CXX)
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@ -222,9 +222,13 @@ const MCExpr *WinException::create32bitRef(const Value *V) {
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/// imagerel32 LabelLPad; // Zero means __finally.
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/// } Entries[NumEntries];
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/// };
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void WinException::emitCSpecificHandlerTable() {
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void WinException::emitCSpecificHandlerTable(const MachineFunction *MF) {
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const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
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WinEHFuncInfo &FuncInfo = MMI->getWinEHFuncInfo(MF->getFunction());
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if (!FuncInfo.SEHUnwindMap.empty())
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report_fatal_error("x64 SEH tables not yet implemented");
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// Simplifying assumptions for first implementation:
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// - Cleanups are not implemented.
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// - Filters are not implemented.
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@ -309,6 +313,15 @@ void WinException::emitCSpecificHandlerTable() {
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}
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}
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/// Retreive the MCSymbol for a GlobalValue or MachineBasicBlock. GlobalValues
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/// are used in the old WinEH scheme, and they will be removed eventually.
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static MCSymbol *getMCSymbolForMBBOrGV(AsmPrinter *Asm, ValueOrMBB Handler) {
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if (Handler.is<MachineBasicBlock *>())
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return Handler.get<MachineBasicBlock *>()->getSymbol();
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else
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return Asm->getSymbol(cast<GlobalValue>(Handler.get<const Value *>()));
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}
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void WinException::emitCXXFrameHandler3Table(const MachineFunction *MF) {
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const Function *F = MF->getFunction();
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const Function *ParentF = MMI->getWinEHParent(F);
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@ -422,9 +435,9 @@ void WinException::emitCXXFrameHandler3Table(const MachineFunction *MF) {
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int CatchHigh = TBME.CatchHigh;
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if (CatchHigh == -1) {
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for (WinEHHandlerType &HT : TBME.HandlerArray)
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CatchHigh = std::max(
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CatchHigh,
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FuncInfo.CatchHandlerMaxState[cast<Function>(HT.Handler)]);
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CatchHigh =
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std::max(CatchHigh, FuncInfo.CatchHandlerMaxState[cast<Function>(
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HT.Handler.get<const Value *>())]);
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}
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assert(TBME.TryLow <= TBME.TryHigh);
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@ -464,13 +477,12 @@ void WinException::emitCXXFrameHandler3Table(const MachineFunction *MF) {
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FrameAllocOffsetRef = MCConstantExpr::create(0, Asm->OutContext);
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}
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MCSymbol *HandlerSym = getMCSymbolForMBBOrGV(Asm, HT.Handler);
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OS.EmitIntValue(HT.Adjectives, 4); // Adjectives
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OS.EmitValue(create32bitRef(HT.TypeDescriptor), 4); // Type
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OS.EmitValue(FrameAllocOffsetRef, 4); // CatchObjOffset
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if (HT.HandlerMBB) // Handler
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OS.EmitValue(create32bitRef(HT.HandlerMBB->getSymbol()), 4);
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else
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OS.EmitValue(create32bitRef(HT.Handler), 4);
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OS.EmitValue(create32bitRef(HandlerSym), 4); // Handler
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if (shouldEmitPersonality) {
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if (FuncInfo.CatchHandlerParentFrameObjOffset.empty()) {
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@ -482,7 +494,8 @@ void WinException::emitCXXFrameHandler3Table(const MachineFunction *MF) {
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} else {
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MCSymbol *ParentFrameOffset =
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Asm->OutContext.getOrCreateParentFrameOffsetSymbol(
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GlobalValue::getRealLinkageName(HT.Handler->getName()));
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GlobalValue::getRealLinkageName(
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HT.Handler.get<const Value *>()->getName()));
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const MCSymbolRefExpr *ParentFrameOffsetRef =
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MCSymbolRefExpr::create(ParentFrameOffset, Asm->OutContext);
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OS.EmitValue(ParentFrameOffsetRef, 4); // ParentFrameOffset
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@ -642,6 +655,19 @@ void WinException::emitExceptHandlerTable(const MachineFunction *MF) {
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BaseState = -2;
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}
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if (!FuncInfo.SEHUnwindMap.empty()) {
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for (SEHUnwindMapEntry &UME : FuncInfo.SEHUnwindMap) {
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MCSymbol *ExceptOrFinally =
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UME.Handler.get<MachineBasicBlock *>()->getSymbol();
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OS.EmitIntValue(UME.ToState, 4); // ToState
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OS.EmitValue(create32bitRef(UME.Filter), 4); // Filter
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OS.EmitValue(create32bitRef(ExceptOrFinally), 4); // Except/Finally
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}
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return;
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}
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// FIXME: The following code is for the old landingpad-based SEH
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// implementation. Remove it when possible.
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// Build a list of pointers to LandingPadInfos and then sort by WinEHState.
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const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
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SmallVector<const LandingPadInfo *, 4> LPads;
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@ -36,7 +36,7 @@ class LLVM_LIBRARY_VISIBILITY WinException : public EHStreamer {
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/// True if this is a 64-bit target and we should use image relative offsets.
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bool useImageRel32 = false;
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void emitCSpecificHandlerTable();
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void emitCSpecificHandlerTable(const MachineFunction *MF);
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/// Emit the EH table data for 32-bit and 64-bit functions using
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/// the __CxxFrameHandler3 personality.
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@ -287,22 +287,32 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
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addSEHHandlersForLPads(LPads);
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}
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// Calculate state numbers if we haven't already.
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WinEHFuncInfo &EHInfo = MMI.getWinEHFuncInfo(&fn);
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if (Personality == EHPersonality::MSVC_CXX) {
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// Calculate state numbers and then map from funclet BBs to MBBs.
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const Function *WinEHParentFn = MMI.getWinEHParent(&fn);
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calculateWinCXXEHStateNumbers(WinEHParentFn, EHInfo);
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} else {
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const Function *WinEHParentFn = MMI.getWinEHParent(&fn);
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calculateSEHStateNumbers(WinEHParentFn, EHInfo);
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}
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// Map all BB references in the EH data to MBBs.
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for (WinEHTryBlockMapEntry &TBME : EHInfo.TryBlockMap)
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for (WinEHHandlerType &H : TBME.HandlerArray)
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if (const auto *BB = dyn_cast<BasicBlock>(H.Handler))
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H.HandlerMBB = MBBMap[BB];
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if (const auto *BB =
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dyn_cast<BasicBlock>(H.Handler.get<const Value *>()))
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H.Handler = MBBMap[BB];
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for (SEHUnwindMapEntry &UME : EHInfo.SEHUnwindMap) {
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const BasicBlock *BB = UME.Handler.get<const BasicBlock *>();
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UME.Handler = MBBMap[BB];
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}
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// If there's an explicit EH registration node on the stack, record its
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// frame index.
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if (EHInfo.EHRegNode && EHInfo.EHRegNode->getParent()->getParent() == Fn) {
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assert(StaticAllocaMap.count(EHInfo.EHRegNode));
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EHInfo.EHRegNodeFrameIndex = StaticAllocaMap[EHInfo.EHRegNode];
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}
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}
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// Copy the state numbers to LandingPadInfo for the current function, which
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// could be a handler or the parent. This should happen for 32-bit SEH and
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@ -1989,7 +1989,6 @@ void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) {
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// and catchendpads for successors.
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MachineBasicBlock *Return = FuncInfo.MBBMap[I.getSuccessor(0)];
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const BasicBlock *EHPadBB = I.getSuccessor(1);
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bool IsLandingPad = EHPadBB->isLandingPad();
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const Value *Callee(I.getCalledValue());
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const Function *Fn = dyn_cast<Function>(Callee);
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@ -2025,16 +2024,26 @@ void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) {
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// Catchpads are conditional branches that add real MBB destinations and
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// continue the loop. EH "end" pads are not real BBs and simply continue.
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SmallVector<MachineBasicBlock *, 1> UnwindDests;
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bool IsMSVCCXX = classifyEHPersonality(FuncInfo.Fn->getPersonalityFn()) ==
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EHPersonality::MSVC_CXX;
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while (EHPadBB) {
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const Instruction *Pad = EHPadBB->getFirstNonPHI();
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if (isa<CleanupPadInst>(Pad) || isa<LandingPadInst>(Pad)) {
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assert(FuncInfo.MBBMap[EHPadBB]);
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// Stop on cleanup pads and landingpads.
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if (isa<LandingPadInst>(Pad)) {
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// Stop on landingpads. They are not funclets.
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UnwindDests.push_back(FuncInfo.MBBMap[EHPadBB]);
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break;
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} else if (isa<CleanupPadInst>(Pad) || isa<LandingPadInst>(Pad)) {
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// Stop on cleanup pads. Cleanups are always funclet entries for all known
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// personalities.
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UnwindDests.push_back(FuncInfo.MBBMap[EHPadBB]);
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UnwindDests.back()->setIsEHFuncletEntry();
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break;
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} else if (const auto *CPI = dyn_cast<CatchPadInst>(Pad)) {
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// Add the catchpad handler to the possible destinations.
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UnwindDests.push_back(FuncInfo.MBBMap[CPI->getNormalDest()]);
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// In MSVC C++, catchblocks are funclets and need prologues.
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if (IsMSVCCXX)
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UnwindDests.back()->setIsEHFuncletEntry();
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EHPadBB = CPI->getUnwindDest();
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} else if (const auto *CEPI = dyn_cast<CatchEndPadInst>(Pad)) {
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EHPadBB = CEPI->getUnwindDest();
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@ -2043,13 +2052,11 @@ void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) {
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}
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}
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// Update successor info
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// Update successor info.
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// FIXME: The weights for catchpads will be wrong.
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addSuccessorWithWeight(InvokeMBB, Return);
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for (auto *UnwindDest : UnwindDests) {
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for (MachineBasicBlock *UnwindDest : UnwindDests) {
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UnwindDest->setIsEHPad();
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if (!IsLandingPad)
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UnwindDest->setIsEHFuncletEntry();
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addSuccessorWithWeight(InvokeMBB, UnwindDest);
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}
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@ -2616,7 +2616,6 @@ static void addTryBlockMapEntry(WinEHFuncInfo &FuncInfo, int TryLow,
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cast<GlobalVariable>(CS->getAggregateElement(1)->stripPointerCasts());
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}
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HT.Handler = CPI->getNormalDest();
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HT.HandlerMBB = nullptr;
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// FIXME: Pass CPI->getArgOperand(1).
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HT.CatchObjRecoverIdx = -1;
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TBME.HandlerArray.push_back(HT);
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@ -2645,7 +2644,8 @@ void WinEHNumbering::createTryBlockMapEntry(int TryLow, int TryHigh,
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continue;
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int N;
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for (N = 0; N < NumHandlers; ++N) {
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if (Entry.HandlerArray[N].Handler != Handlers[N]->getHandlerBlockOrFunc())
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if (Entry.HandlerArray[N].Handler.get<const Value *>() !=
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Handlers[N]->getHandlerBlockOrFunc())
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break; // breaks out of inner loop
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}
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// If all the handlers match, this is what we were looking for.
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@ -2692,7 +2692,6 @@ void WinEHNumbering::createTryBlockMapEntry(int TryLow, int TryHigh,
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cast<GlobalVariable>(CS->getAggregateElement(1)->stripPointerCasts());
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}
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HT.Handler = cast<Function>(CH->getHandlerBlockOrFunc());
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HT.HandlerMBB = nullptr;
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HT.CatchObjRecoverIdx = CH->getExceptionVarIndex();
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TBME.HandlerArray.push_back(HT);
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}
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@ -2949,13 +2948,45 @@ void WinEHNumbering::findActionRootLPads(const Function &F) {
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}
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}
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static const BasicBlock *getSingleCatchPadPredecessor(const BasicBlock &BB) {
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for (const BasicBlock *PredBlock : predecessors(&BB))
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if (isa<CatchPadInst>(PredBlock->getFirstNonPHI()))
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return PredBlock;
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static const CatchPadInst *getSingleCatchPadPredecessor(const BasicBlock *BB) {
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for (const BasicBlock *PredBlock : predecessors(BB))
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if (auto *CPI = dyn_cast<CatchPadInst>(PredBlock->getFirstNonPHI()))
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return CPI;
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return nullptr;
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}
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/// Find all the catchpads that feed directly into the catchendpad. Frontends
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/// using this personality should ensure that each catchendpad and catchpad has
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/// one or zero catchpad predecessors.
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///
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/// The following C++ generates the IR after it:
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/// try {
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/// } catch (A) {
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/// } catch (B) {
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/// }
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///
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/// IR:
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/// %catchpad.A
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/// catchpad [i8* A typeinfo]
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/// to label %catch.A unwind label %catchpad.B
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/// %catchpad.B
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/// catchpad [i8* B typeinfo]
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/// to label %catch.B unwind label %endcatches
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/// %endcatches
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/// catchendblock unwind to caller
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void findCatchPadsForCatchEndPad(
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const BasicBlock *CatchEndBB,
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SmallVectorImpl<const CatchPadInst *> &Handlers) {
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const CatchPadInst *CPI = getSingleCatchPadPredecessor(CatchEndBB);
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while (CPI) {
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Handlers.push_back(CPI);
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CPI = getSingleCatchPadPredecessor(CPI->getParent());
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}
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// We've pushed these back into reverse source order. Reverse them to get
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// the list back into source order.
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std::reverse(Handlers.begin(), Handlers.end());
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}
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// Given BB which ends in an unwind edge, return the EHPad that this BB belongs
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// to. If the unwind edge came from an invoke, return null.
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static const BasicBlock *getEHPadFromPredecessor(const BasicBlock *BB) {
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@ -2970,7 +3001,7 @@ static const BasicBlock *getEHPadFromPredecessor(const BasicBlock *BB) {
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return cast<CleanupReturnInst>(TI)->getCleanupPad()->getParent();
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}
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static void calculateExplicitStateNumbers(WinEHFuncInfo &FuncInfo,
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static void calculateExplicitCXXStateNumbers(WinEHFuncInfo &FuncInfo,
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const BasicBlock &BB,
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int ParentState) {
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assert(BB.isEHPad());
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@ -2981,36 +3012,30 @@ static void calculateExplicitStateNumbers(WinEHFuncInfo &FuncInfo,
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return;
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if (isa<CatchEndPadInst>(FirstNonPHI)) {
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const BasicBlock *TryPad = &BB;
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const BasicBlock *LastTryPad = nullptr;
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SmallVector<const CatchPadInst *, 2> Handlers;
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do {
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LastTryPad = TryPad;
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TryPad = getSingleCatchPadPredecessor(*TryPad);
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if (TryPad)
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Handlers.push_back(cast<CatchPadInst>(TryPad->getFirstNonPHI()));
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} while (TryPad);
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// We've pushed these back into reverse source order. Reverse them to get
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// the list back into source order.
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std::reverse(Handlers.begin(), Handlers.end());
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findCatchPadsForCatchEndPad(&BB, Handlers);
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const BasicBlock *FirstTryPad = Handlers.front()->getParent();
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int TryLow = addUnwindMapEntry(FuncInfo, ParentState, nullptr);
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FuncInfo.EHPadStateMap[Handlers.front()] = TryLow;
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for (const BasicBlock *PredBlock : predecessors(LastTryPad))
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for (const BasicBlock *PredBlock : predecessors(FirstTryPad))
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if ((PredBlock = getEHPadFromPredecessor(PredBlock)))
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calculateExplicitStateNumbers(FuncInfo, *PredBlock, TryLow);
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calculateExplicitCXXStateNumbers(FuncInfo, *PredBlock, TryLow);
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int CatchLow = addUnwindMapEntry(FuncInfo, ParentState, nullptr);
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// catchpads are separate funclets in C++ EH due to the way rethrow works.
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// In SEH, they aren't, so no invokes will unwind to the catchendpad.
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FuncInfo.EHPadStateMap[FirstNonPHI] = CatchLow;
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int TryHigh = CatchLow - 1;
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for (const BasicBlock *PredBlock : predecessors(&BB))
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if ((PredBlock = getEHPadFromPredecessor(PredBlock)))
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calculateExplicitStateNumbers(FuncInfo, *PredBlock, CatchLow);
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calculateExplicitCXXStateNumbers(FuncInfo, *PredBlock, CatchLow);
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int CatchHigh = FuncInfo.getLastStateNumber();
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addTryBlockMapEntry(FuncInfo, TryLow, TryHigh, CatchHigh, Handlers);
|
||||
DEBUG(dbgs() << "TryLow[" << LastTryPad->getName() << "]: " << TryLow
|
||||
DEBUG(dbgs() << "TryLow[" << FirstTryPad->getName() << "]: " << TryLow
|
||||
<< '\n');
|
||||
DEBUG(dbgs() << "TryHigh[" << LastTryPad->getName() << "]: " << TryHigh
|
||||
DEBUG(dbgs() << "TryHigh[" << FirstTryPad->getName() << "]: " << TryHigh
|
||||
<< '\n');
|
||||
DEBUG(dbgs() << "CatchHigh[" << LastTryPad->getName() << "]: " << CatchHigh
|
||||
DEBUG(dbgs() << "CatchHigh[" << FirstTryPad->getName() << "]: " << CatchHigh
|
||||
<< '\n');
|
||||
} else if (isa<CleanupPadInst>(FirstNonPHI)) {
|
||||
int CleanupState = addUnwindMapEntry(FuncInfo, ParentState, &BB);
|
||||
@ -3019,7 +3044,7 @@ static void calculateExplicitStateNumbers(WinEHFuncInfo &FuncInfo,
|
||||
<< BB.getName() << '\n');
|
||||
for (const BasicBlock *PredBlock : predecessors(&BB))
|
||||
if ((PredBlock = getEHPadFromPredecessor(PredBlock)))
|
||||
calculateExplicitStateNumbers(FuncInfo, *PredBlock, CleanupState);
|
||||
calculateExplicitCXXStateNumbers(FuncInfo, *PredBlock, CleanupState);
|
||||
} else if (isa<TerminatePadInst>(FirstNonPHI)) {
|
||||
report_fatal_error("Not yet implemented!");
|
||||
} else {
|
||||
@ -3027,6 +3052,103 @@ static void calculateExplicitStateNumbers(WinEHFuncInfo &FuncInfo,
|
||||
}
|
||||
}
|
||||
|
||||
static int addSEHHandler(WinEHFuncInfo &FuncInfo, int ParentState,
|
||||
const Function *Filter, const BasicBlock *Handler) {
|
||||
SEHUnwindMapEntry Entry;
|
||||
Entry.ToState = ParentState;
|
||||
Entry.Filter = Filter;
|
||||
Entry.Handler = Handler;
|
||||
FuncInfo.SEHUnwindMap.push_back(Entry);
|
||||
return FuncInfo.SEHUnwindMap.size() - 1;
|
||||
}
|
||||
|
||||
static void calculateExplicitSEHStateNumbers(WinEHFuncInfo &FuncInfo,
|
||||
const BasicBlock &BB,
|
||||
int ParentState) {
|
||||
assert(BB.isEHPad());
|
||||
const Instruction *FirstNonPHI = BB.getFirstNonPHI();
|
||||
// All catchpad instructions will be handled when we process their
|
||||
// respective catchendpad instruction.
|
||||
if (isa<CatchPadInst>(FirstNonPHI))
|
||||
return;
|
||||
|
||||
if (isa<CatchEndPadInst>(FirstNonPHI)) {
|
||||
// Extract the filter function and the __except basic block and create a
|
||||
// state for them.
|
||||
SmallVector<const CatchPadInst *, 1> Handlers;
|
||||
findCatchPadsForCatchEndPad(&BB, Handlers);
|
||||
assert(Handlers.size() == 1 &&
|
||||
"SEH doesn't have multiple handlers per __try");
|
||||
const CatchPadInst *CPI = Handlers.front();
|
||||
const BasicBlock *CatchPadBB = CPI->getParent();
|
||||
const Function *Filter =
|
||||
cast<Function>(CPI->getArgOperand(0)->stripPointerCasts());
|
||||
int TryState =
|
||||
addSEHHandler(FuncInfo, ParentState, Filter, CPI->getNormalDest());
|
||||
|
||||
// Everything in the __try block uses TryState as its parent state.
|
||||
FuncInfo.EHPadStateMap[CPI] = TryState;
|
||||
DEBUG(dbgs() << "Assigning state #" << TryState << " to BB "
|
||||
<< CatchPadBB->getName() << '\n');
|
||||
for (const BasicBlock *PredBlock : predecessors(CatchPadBB))
|
||||
if ((PredBlock = getEHPadFromPredecessor(PredBlock)))
|
||||
calculateExplicitSEHStateNumbers(FuncInfo, *PredBlock, TryState);
|
||||
|
||||
// Everything in the __except block unwinds to ParentState, just like code
|
||||
// outside the __try.
|
||||
FuncInfo.EHPadStateMap[FirstNonPHI] = ParentState;
|
||||
DEBUG(dbgs() << "Assigning state #" << ParentState << " to BB "
|
||||
<< BB.getName() << '\n');
|
||||
for (const BasicBlock *PredBlock : predecessors(&BB))
|
||||
if ((PredBlock = getEHPadFromPredecessor(PredBlock)))
|
||||
calculateExplicitSEHStateNumbers(FuncInfo, *PredBlock, ParentState);
|
||||
} else if (isa<CleanupPadInst>(FirstNonPHI)) {
|
||||
int CleanupState =
|
||||
addSEHHandler(FuncInfo, ParentState, /*Filter=*/nullptr, &BB);
|
||||
FuncInfo.EHPadStateMap[FirstNonPHI] = CleanupState;
|
||||
DEBUG(dbgs() << "Assigning state #" << CleanupState << " to BB "
|
||||
<< BB.getName() << '\n');
|
||||
for (const BasicBlock *PredBlock : predecessors(&BB))
|
||||
if ((PredBlock = getEHPadFromPredecessor(PredBlock)))
|
||||
calculateExplicitSEHStateNumbers(FuncInfo, *PredBlock, CleanupState);
|
||||
} else if (isa<TerminatePadInst>(FirstNonPHI)) {
|
||||
report_fatal_error("Not yet implemented!");
|
||||
} else {
|
||||
llvm_unreachable("unexpected EH Pad!");
|
||||
}
|
||||
}
|
||||
|
||||
/// Check if the EH Pad unwinds to caller. Cleanups are a little bit of a
|
||||
/// special case because we have to look at the cleanupret instruction that uses
|
||||
/// the cleanuppad.
|
||||
static bool doesEHPadUnwindToCaller(const Instruction *EHPad) {
|
||||
auto *CPI = dyn_cast<CleanupPadInst>(EHPad);
|
||||
if (!CPI)
|
||||
return EHPad->mayThrow();
|
||||
|
||||
// This cleanup does not return or unwind, so we say it unwinds to caller.
|
||||
if (CPI->use_empty())
|
||||
return true;
|
||||
|
||||
const Instruction *User = CPI->user_back();
|
||||
if (auto *CRI = dyn_cast<CleanupReturnInst>(User))
|
||||
return CRI->unwindsToCaller();
|
||||
return cast<CleanupEndPadInst>(User)->unwindsToCaller();
|
||||
}
|
||||
|
||||
void llvm::calculateSEHStateNumbers(const Function *ParentFn,
|
||||
WinEHFuncInfo &FuncInfo) {
|
||||
// Don't compute state numbers twice.
|
||||
if (!FuncInfo.SEHUnwindMap.empty())
|
||||
return;
|
||||
|
||||
for (const BasicBlock &BB : *ParentFn) {
|
||||
if (!BB.isEHPad() || !doesEHPadUnwindToCaller(BB.getFirstNonPHI()))
|
||||
continue;
|
||||
calculateExplicitSEHStateNumbers(FuncInfo, BB, -1);
|
||||
}
|
||||
}
|
||||
|
||||
void llvm::calculateWinCXXEHStateNumbers(const Function *ParentFn,
|
||||
WinEHFuncInfo &FuncInfo) {
|
||||
// Return if it's already been done.
|
||||
@ -3041,28 +3163,9 @@ void llvm::calculateWinCXXEHStateNumbers(const Function *ParentFn,
|
||||
// Skip cleanupendpads; they are exits, not entries.
|
||||
if (isa<CleanupEndPadInst>(FirstNonPHI))
|
||||
continue;
|
||||
// Check if the EH Pad has no exceptional successors (i.e. it unwinds to
|
||||
// caller). Cleanups are a little bit of a special case because their
|
||||
// control flow cannot be determined by looking at the pad but instead by
|
||||
// the pad's users.
|
||||
bool HasNoSuccessors = false;
|
||||
if (FirstNonPHI->mayThrow()) {
|
||||
HasNoSuccessors = true;
|
||||
} else if (auto *CPI = dyn_cast<CleanupPadInst>(FirstNonPHI)) {
|
||||
if (CPI->use_empty()) {
|
||||
HasNoSuccessors = true;
|
||||
} else {
|
||||
const Instruction *User = CPI->user_back();
|
||||
if (auto *CRI = dyn_cast<CleanupReturnInst>(User))
|
||||
HasNoSuccessors = CRI->unwindsToCaller();
|
||||
else
|
||||
HasNoSuccessors = cast<CleanupEndPadInst>(User)->unwindsToCaller();
|
||||
}
|
||||
}
|
||||
|
||||
if (!HasNoSuccessors)
|
||||
if (!doesEHPadUnwindToCaller(FirstNonPHI))
|
||||
continue;
|
||||
calculateExplicitStateNumbers(FuncInfo, BB, -1);
|
||||
calculateExplicitCXXStateNumbers(FuncInfo, BB, -1);
|
||||
IsExplicit = true;
|
||||
}
|
||||
|
||||
|
||||
@ -16880,6 +16880,16 @@ SDValue X86TargetLowering::LowerCATCHRET(SDValue Op, SelectionDAG &DAG) const {
|
||||
SDLoc DL(Op);
|
||||
|
||||
MVT PtrVT = getPointerTy(DAG.getDataLayout());
|
||||
|
||||
MachineFunction &MF = DAG.getMachineFunction();
|
||||
if (isAsynchronousEHPersonality(
|
||||
classifyEHPersonality(MF.getFunction()->getPersonalityFn()))) {
|
||||
// For SEH, codegen catchret as a branch for now.
|
||||
// FIXME: Insert something to restore the frame.
|
||||
return DAG.getNode(ISD::BR, DL, MVT::Other, Chain, Dest);
|
||||
}
|
||||
|
||||
|
||||
unsigned ReturnReg = (PtrVT == MVT::i64 ? X86::RAX : X86::EAX);
|
||||
|
||||
// Load the address of the destination block.
|
||||
|
||||
@ -68,9 +68,10 @@ private:
|
||||
void unlinkExceptionRegistration(IRBuilder<> &Builder);
|
||||
void addCXXStateStores(Function &F, WinEHFuncInfo &FuncInfo);
|
||||
void addSEHStateStores(Function &F, WinEHFuncInfo &FuncInfo);
|
||||
void addCXXStateStoresToFunclet(Value *ParentRegNode, WinEHFuncInfo &FuncInfo,
|
||||
void addStateStoresToFunclet(Value *ParentRegNode, WinEHFuncInfo &FuncInfo,
|
||||
Function &F, int BaseState);
|
||||
void insertStateNumberStore(Value *ParentRegNode, Instruction *IP, int State);
|
||||
void insertRestoreFrame(BasicBlock *BB);
|
||||
|
||||
Value *emitEHLSDA(IRBuilder<> &Builder, Function *F);
|
||||
|
||||
@ -91,6 +92,7 @@ private:
|
||||
Function *FrameRecover = nullptr;
|
||||
Function *FrameAddress = nullptr;
|
||||
Function *FrameEscape = nullptr;
|
||||
Function *RestoreFrame = nullptr;
|
||||
|
||||
// Per-function state
|
||||
EHPersonality Personality = EHPersonality::Unknown;
|
||||
@ -123,6 +125,8 @@ bool WinEHStatePass::doInitialization(Module &M) {
|
||||
FrameEscape = Intrinsic::getDeclaration(TheModule, Intrinsic::localescape);
|
||||
FrameRecover = Intrinsic::getDeclaration(TheModule, Intrinsic::localrecover);
|
||||
FrameAddress = Intrinsic::getDeclaration(TheModule, Intrinsic::frameaddress);
|
||||
RestoreFrame =
|
||||
Intrinsic::getDeclaration(TheModule, Intrinsic::x86_seh_restoreframe);
|
||||
return false;
|
||||
}
|
||||
|
||||
@ -414,7 +418,7 @@ void WinEHStatePass::addCXXStateStores(Function &F, WinEHFuncInfo &FuncInfo) {
|
||||
calculateWinCXXEHStateNumbers(&F, FuncInfo);
|
||||
|
||||
// The base state for the parent is -1.
|
||||
addCXXStateStoresToFunclet(RegNode, FuncInfo, F, -1);
|
||||
addStateStoresToFunclet(RegNode, FuncInfo, F, -1);
|
||||
|
||||
// Set up RegNodeEscapeIndex
|
||||
int RegNodeEscapeIndex = escapeRegNode(F);
|
||||
@ -434,7 +438,7 @@ void WinEHStatePass::addCXXStateStores(Function &F, WinEHFuncInfo &FuncInfo) {
|
||||
FrameRecover, {FI8, ParentFP, Builder.getInt32(RegNodeEscapeIndex)});
|
||||
RecoveredRegNode =
|
||||
Builder.CreateBitCast(RecoveredRegNode, RegNodeTy->getPointerTo(0));
|
||||
addCXXStateStoresToFunclet(RecoveredRegNode, FuncInfo, *Handler, BaseState);
|
||||
addStateStoresToFunclet(RecoveredRegNode, FuncInfo, *Handler, BaseState);
|
||||
}
|
||||
}
|
||||
|
||||
@ -470,11 +474,17 @@ int WinEHStatePass::escapeRegNode(Function &F) {
|
||||
return Args.size() - 1;
|
||||
}
|
||||
|
||||
void WinEHStatePass::addCXXStateStoresToFunclet(Value *ParentRegNode,
|
||||
void WinEHStatePass::insertRestoreFrame(BasicBlock *BB) {
|
||||
Instruction *Start = BB->getFirstInsertionPt();
|
||||
if (match(Start, m_Intrinsic<Intrinsic::x86_seh_restoreframe>()))
|
||||
return;
|
||||
IRBuilder<> Builder(Start);
|
||||
Builder.CreateCall(RestoreFrame, {});
|
||||
}
|
||||
|
||||
void WinEHStatePass::addStateStoresToFunclet(Value *ParentRegNode,
|
||||
WinEHFuncInfo &FuncInfo,
|
||||
Function &F, int BaseState) {
|
||||
Function *RestoreFrame =
|
||||
Intrinsic::getDeclaration(TheModule, Intrinsic::x86_seh_restoreframe);
|
||||
// Iterate all the instructions and emit state number stores.
|
||||
for (BasicBlock &BB : F) {
|
||||
for (Instruction &I : BB) {
|
||||
@ -494,16 +504,14 @@ void WinEHStatePass::addCXXStateStoresToFunclet(Value *ParentRegNode,
|
||||
}
|
||||
}
|
||||
|
||||
// Insert calls to llvm.x86.seh.restoreframe at catchret destinations.
|
||||
if (auto *CR = dyn_cast<CatchReturnInst>(BB.getTerminator())) {
|
||||
Instruction *Start = CR->getSuccessor()->begin();
|
||||
assert(!isa<PHINode>(Start) &&
|
||||
"winehprepare failed to demote phi after catchret");
|
||||
if (match(Start, m_Intrinsic<Intrinsic::x86_seh_restoreframe>()))
|
||||
continue;
|
||||
IRBuilder<> Builder(Start);
|
||||
Builder.CreateCall(RestoreFrame, {});
|
||||
}
|
||||
// Insert calls to llvm.x86.seh.restoreframe at catchret destinations. In
|
||||
// SEH, insert them before the catchret.
|
||||
// FIXME: We should probably do this as part of catchret lowering in the
|
||||
// DAG.
|
||||
if (auto *CR = dyn_cast<CatchReturnInst>(BB.getTerminator()))
|
||||
insertRestoreFrame(Personality == EHPersonality::MSVC_X86SEH
|
||||
? CR->getParent()
|
||||
: CR->getSuccessor());
|
||||
}
|
||||
}
|
||||
|
||||
@ -519,6 +527,23 @@ void WinEHStatePass::addSEHStateStores(Function &F, WinEHFuncInfo &FuncInfo) {
|
||||
int RegNodeEscapeIndex = escapeRegNode(F);
|
||||
FuncInfo.EHRegNodeEscapeIndex = RegNodeEscapeIndex;
|
||||
|
||||
// If this funciton uses the new EH IR, use the explicit state numbering
|
||||
// algorithm and return early.
|
||||
bool UsesLPads = false;
|
||||
for (BasicBlock &BB : F) {
|
||||
if (BB.isLandingPad()) {
|
||||
UsesLPads = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!UsesLPads) {
|
||||
calculateSEHStateNumbers(&F, FuncInfo);
|
||||
addStateStoresToFunclet(RegNode, FuncInfo, F, -1);
|
||||
return;
|
||||
}
|
||||
// FIXME: Delete the rest of this code and clean things up when new EH is
|
||||
// done.
|
||||
|
||||
// Iterate all the instructions and emit state number stores.
|
||||
int CurState = 0;
|
||||
SmallPtrSet<BasicBlock *, 4> ExceptBlocks;
|
||||
|
||||
219
test/CodeGen/X86/win32-seh-catchpad.ll
Normal file
219
test/CodeGen/X86/win32-seh-catchpad.ll
Normal file
@ -0,0 +1,219 @@
|
||||
; RUN: llc < %s | FileCheck %s
|
||||
|
||||
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
|
||||
target triple = "i686-pc-windows-msvc"
|
||||
|
||||
define void @try_except() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
|
||||
entry:
|
||||
%__exception_code = alloca i32, align 4
|
||||
call void (...) @llvm.localescape(i32* %__exception_code)
|
||||
invoke void @f(i32 1) #3
|
||||
to label %invoke.cont unwind label %catch.dispatch
|
||||
|
||||
catch.dispatch: ; preds = %entry
|
||||
%0 = catchpad [i8* bitcast (i32 ()* @try_except_filter_catchall to i8*)] to label %__except.ret unwind label %catchendblock
|
||||
|
||||
__except.ret: ; preds = %catch.dispatch
|
||||
catchret %0 to label %__except
|
||||
|
||||
__except: ; preds = %__except.ret
|
||||
call void @f(i32 2)
|
||||
br label %__try.cont
|
||||
|
||||
__try.cont: ; preds = %__except, %invoke.cont
|
||||
call void @f(i32 3)
|
||||
ret void
|
||||
|
||||
catchendblock: ; preds = %catch.dispatch
|
||||
catchendpad unwind to caller
|
||||
|
||||
invoke.cont: ; preds = %entry
|
||||
br label %__try.cont
|
||||
}
|
||||
|
||||
; CHECK-LABEL: _try_except:
|
||||
; Store state #0
|
||||
; CHECK: movl $0, -[[state:[0-9]+]](%ebp)
|
||||
; CHECK: movl $1, (%esp)
|
||||
; CHECK: calll _f
|
||||
; CHECK: movl $-1, -[[state]](%ebp)
|
||||
; CHECK: movl $3, (%esp)
|
||||
; CHECK: calll _f
|
||||
; CHECK: retl
|
||||
|
||||
; __except
|
||||
; CHECK: movl $-1, -[[state]](%ebp)
|
||||
; CHECK: movl $2, (%esp)
|
||||
; CHECK: calll _f
|
||||
|
||||
; CHECK: .section .xdata,"dr"
|
||||
; CHECK: L__ehtable$try_except:
|
||||
; CHECK: .long -1
|
||||
; CHECK: .long _try_except_filter_catchall
|
||||
; CHECK: .long LBB0_1
|
||||
|
||||
define internal i32 @try_except_filter_catchall() #0 {
|
||||
entry:
|
||||
%0 = call i8* @llvm.frameaddress(i32 1)
|
||||
%1 = call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void ()* @try_except to i8*), i8* %0)
|
||||
%2 = call i8* @llvm.localrecover(i8* bitcast (void ()* @try_except to i8*), i8* %1, i32 0)
|
||||
%__exception_code = bitcast i8* %2 to i32*
|
||||
%3 = getelementptr inbounds i8, i8* %0, i32 -20
|
||||
%4 = bitcast i8* %3 to i8**
|
||||
%5 = load i8*, i8** %4, align 4
|
||||
%6 = bitcast i8* %5 to { i32*, i8* }*
|
||||
%7 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %6, i32 0, i32 0
|
||||
%8 = load i32*, i32** %7, align 4
|
||||
%9 = load i32, i32* %8, align 4
|
||||
store i32 %9, i32* %__exception_code, align 4
|
||||
ret i32 1
|
||||
}
|
||||
|
||||
define void @nested_exceptions() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
|
||||
entry:
|
||||
%__exception_code = alloca i32, align 4
|
||||
call void (...) @llvm.localescape(i32* %__exception_code)
|
||||
invoke void @crash() #3
|
||||
to label %__try.cont unwind label %catch.dispatch
|
||||
|
||||
catch.dispatch: ; preds = %entry
|
||||
%0 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret unwind label %catchendblock
|
||||
|
||||
__except.ret: ; preds = %catch.dispatch
|
||||
catchret %0 to label %__try.cont
|
||||
|
||||
__try.cont: ; preds = %entry, %__except.ret
|
||||
invoke void @crash() #3
|
||||
to label %__try.cont.9 unwind label %catch.dispatch.5
|
||||
|
||||
catch.dispatch.5: ; preds = %__try.cont
|
||||
%1 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.7 unwind label %catchendblock.6
|
||||
|
||||
__except.ret.7: ; preds = %catch.dispatch.5
|
||||
catchret %1 to label %__try.cont.9
|
||||
|
||||
__try.cont.9: ; preds = %__try.cont, %__except.ret.7
|
||||
invoke void @crash() #3
|
||||
to label %__try.cont.15 unwind label %catch.dispatch.11
|
||||
|
||||
catch.dispatch.11: ; preds = %catchendblock, %catchendblock.6, %__try.cont.9
|
||||
%2 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.13 unwind label %catchendblock.12
|
||||
|
||||
__except.ret.13: ; preds = %catch.dispatch.11
|
||||
catchret %2 to label %__try.cont.15
|
||||
|
||||
__try.cont.15: ; preds = %__try.cont.9, %__except.ret.13
|
||||
invoke void @crash() #3
|
||||
to label %__try.cont.35 unwind label %catch.dispatch.17
|
||||
|
||||
catch.dispatch.17: ; preds = %catchendblock.12, %__try.cont.15
|
||||
%3 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.19 unwind label %catchendblock.18
|
||||
|
||||
__except.ret.19: ; preds = %catch.dispatch.17
|
||||
catchret %3 to label %__except.20
|
||||
|
||||
__except.20: ; preds = %__except.ret.19
|
||||
invoke void @crash() #3
|
||||
to label %__try.cont.27 unwind label %catch.dispatch.23
|
||||
|
||||
catch.dispatch.23: ; preds = %__except.20
|
||||
%4 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.25 unwind label %catchendblock.24
|
||||
|
||||
__except.ret.25: ; preds = %catch.dispatch.23
|
||||
catchret %4 to label %__try.cont.27
|
||||
|
||||
__try.cont.27: ; preds = %__except.20, %__except.ret.25
|
||||
invoke void @crash() #3
|
||||
to label %__try.cont.35 unwind label %catch.dispatch.30
|
||||
|
||||
catch.dispatch.30: ; preds = %__try.cont.27
|
||||
%5 = catchpad [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)] to label %__except.ret.32 unwind label %catchendblock.31
|
||||
|
||||
__except.ret.32: ; preds = %catch.dispatch.30
|
||||
catchret %5 to label %__try.cont.35
|
||||
|
||||
__try.cont.35: ; preds = %__try.cont.15, %__try.cont.27, %__except.ret.32
|
||||
ret void
|
||||
|
||||
catchendblock.31: ; preds = %catch.dispatch.30
|
||||
catchendpad unwind to caller
|
||||
|
||||
catchendblock.24: ; preds = %catch.dispatch.23
|
||||
catchendpad unwind to caller
|
||||
|
||||
catchendblock.18: ; preds = %catch.dispatch.17
|
||||
catchendpad unwind to caller
|
||||
|
||||
catchendblock.12: ; preds = %catch.dispatch.11
|
||||
catchendpad unwind label %catch.dispatch.17
|
||||
|
||||
catchendblock.6: ; preds = %catch.dispatch.5
|
||||
catchendpad unwind label %catch.dispatch.11
|
||||
|
||||
catchendblock: ; preds = %catch.dispatch
|
||||
catchendpad unwind label %catch.dispatch.11
|
||||
}
|
||||
|
||||
; This table is equivalent to the one produced by MSVC, even if it isn't in
|
||||
; quite the same order.
|
||||
|
||||
; CHECK-LABEL: _nested_exceptions:
|
||||
; CHECK: L__ehtable$nested_exceptions:
|
||||
; CHECK: .long -1
|
||||
; CHECK: .long _nested_exceptions_filter_catchall
|
||||
; CHECK: .long LBB
|
||||
; CHECK: .long -1
|
||||
; CHECK: .long _nested_exceptions_filter_catchall
|
||||
; CHECK: .long LBB
|
||||
; CHECK: .long -1
|
||||
; CHECK: .long _nested_exceptions_filter_catchall
|
||||
; CHECK: .long LBB
|
||||
; CHECK: .long 2
|
||||
; CHECK: .long _nested_exceptions_filter_catchall
|
||||
; CHECK: .long LBB
|
||||
; CHECK: .long 3
|
||||
; CHECK: .long _nested_exceptions_filter_catchall
|
||||
; CHECK: .long LBB
|
||||
; CHECK: .long 3
|
||||
; CHECK: .long _nested_exceptions_filter_catchall
|
||||
; CHECK: .long LBB
|
||||
|
||||
declare void @crash() #0
|
||||
|
||||
define internal i32 @nested_exceptions_filter_catchall() #0 {
|
||||
entry:
|
||||
%0 = call i8* @llvm.frameaddress(i32 1)
|
||||
%1 = call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void ()* @nested_exceptions to i8*), i8* %0)
|
||||
%2 = call i8* @llvm.localrecover(i8* bitcast (void ()* @nested_exceptions to i8*), i8* %1, i32 0)
|
||||
%__exception_code3 = bitcast i8* %2 to i32*
|
||||
%3 = getelementptr inbounds i8, i8* %0, i32 -20
|
||||
%4 = bitcast i8* %3 to i8**
|
||||
%5 = load i8*, i8** %4, align 4
|
||||
%6 = bitcast i8* %5 to { i32*, i8* }*
|
||||
%7 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %6, i32 0, i32 0
|
||||
%8 = load i32*, i32** %7, align 4
|
||||
%9 = load i32, i32* %8, align 4
|
||||
store i32 %9, i32* %__exception_code3, align 4
|
||||
ret i32 1
|
||||
}
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
declare i8* @llvm.frameaddress(i32) #1
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
declare i8* @llvm.x86.seh.recoverfp(i8*, i8*) #1
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
declare i8* @llvm.localrecover(i8*, i8*, i32) #1
|
||||
|
||||
declare void @f(i32) #0
|
||||
|
||||
declare i32 @_except_handler3(...)
|
||||
|
||||
; Function Attrs: nounwind
|
||||
declare void @llvm.localescape(...) #2
|
||||
|
||||
attributes #0 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
|
||||
attributes #1 = { nounwind readnone }
|
||||
attributes #2 = { nounwind }
|
||||
attributes #3 = { noinline }
|
||||
Loading…
Reference in New Issue
Block a user