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//===-- llvm/CodeGen/WinEHFuncInfo.h ----------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Data structures and associated state for Windows exception handling schemes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_WINEHFUNCINFO_H
#define LLVM_CODEGEN_WINEHFUNCINFO_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/TinyPtrVector.h"
#include "llvm/ADT/DenseMap.h"
namespace llvm {
class BasicBlock;
class Constant;
class Function;
class GlobalVariable;
class InvokeInst;
class IntrinsicInst;
class LandingPadInst;
class MCSymbol;
class Value;
enum ActionType { Catch, Cleanup };
class ActionHandler {
public:
ActionHandler(BasicBlock *BB, ActionType Type)
: StartBB(BB), Type(Type), EHState(-1), HandlerBlockOrFunc(nullptr) {}
ActionType getType() const { return Type; }
BasicBlock *getStartBlock() const { return StartBB; }
bool hasBeenProcessed() { return HandlerBlockOrFunc != nullptr; }
void setHandlerBlockOrFunc(Constant *F) { HandlerBlockOrFunc = F; }
Constant *getHandlerBlockOrFunc() { return HandlerBlockOrFunc; }
void setEHState(int State) { EHState = State; }
int getEHState() const { return EHState; }
private:
BasicBlock *StartBB;
ActionType Type;
int EHState;
// Can be either a BlockAddress or a Function depending on the EH personality.
Constant *HandlerBlockOrFunc;
};
class CatchHandler : public ActionHandler {
public:
CatchHandler(BasicBlock *BB, Constant *Selector, BasicBlock *NextBB)
: ActionHandler(BB, ActionType::Catch), Selector(Selector),
NextBB(NextBB), ExceptionObjectVar(nullptr),
ExceptionObjectIndex(-1) {}
// Method for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ActionHandler *H) {
return H->getType() == ActionType::Catch;
}
Constant *getSelector() const { return Selector; }
BasicBlock *getNextBB() const { return NextBB; }
const Value *getExceptionVar() { return ExceptionObjectVar; }
TinyPtrVector<BasicBlock *> &getReturnTargets() { return ReturnTargets; }
void setExceptionVar(const Value *Val) { ExceptionObjectVar = Val; }
void setExceptionVarIndex(int Index) { ExceptionObjectIndex = Index; }
int getExceptionVarIndex() const { return ExceptionObjectIndex; }
void setReturnTargets(TinyPtrVector<BasicBlock *> &Targets) {
ReturnTargets = Targets;
}
private:
Constant *Selector;
BasicBlock *NextBB;
// While catch handlers are being outlined the ExceptionObjectVar field will
// be populated with the instruction in the parent frame that corresponds
// to the exception object (or nullptr if the catch does not use an
// exception object) and the ExceptionObjectIndex field will be -1.
// When the parseEHActions function is called to populate a vector of
// instances of this class, the ExceptionObjectVar field will be nullptr
// and the ExceptionObjectIndex will be the index of the exception object in
// the parent function's localescape block.
const Value *ExceptionObjectVar;
int ExceptionObjectIndex;
TinyPtrVector<BasicBlock *> ReturnTargets;
};
class CleanupHandler : public ActionHandler {
public:
CleanupHandler(BasicBlock *BB) : ActionHandler(BB, ActionType::Cleanup) {}
// Method for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const ActionHandler *H) {
return H->getType() == ActionType::Cleanup;
}
};
void parseEHActions(const IntrinsicInst *II,
SmallVectorImpl<std::unique_ptr<ActionHandler>> &Actions);
// The following structs respresent the .xdata for functions using C++
// exceptions on Windows.
struct WinEHUnwindMapEntry {
int ToState;
Function *Cleanup;
};
struct WinEHHandlerType {
int Adjectives;
GlobalVariable *TypeDescriptor;
int CatchObjRecoverIdx;
Function *Handler;
};
struct WinEHTryBlockMapEntry {
int TryLow;
int TryHigh;
SmallVector<WinEHHandlerType, 1> HandlerArray;
};
struct WinEHFuncInfo {
DenseMap<const Function *, const LandingPadInst *> RootLPad;
DenseMap<const Function *, const InvokeInst *> LastInvoke;
DenseMap<const Function *, int> HandlerEnclosedState;
DenseMap<const Function *, bool> LastInvokeVisited;
DenseMap<const LandingPadInst *, int> LandingPadStateMap;
DenseMap<const Function *, int> CatchHandlerParentFrameObjIdx;
DenseMap<const Function *, int> CatchHandlerParentFrameObjOffset;
DenseMap<const Function *, int> CatchHandlerMaxState;
DenseMap<const Function *, int> HandlerBaseState;
SmallVector<WinEHUnwindMapEntry, 4> UnwindMap;
SmallVector<WinEHTryBlockMapEntry, 4> TryBlockMap;
SmallVector<std::pair<MCSymbol *, int>, 4> IPToStateList;
int UnwindHelpFrameIdx = INT_MAX;
int UnwindHelpFrameOffset = -1;
unsigned NumIPToStateFuncsVisited = 0;
/// localescape index of the 32-bit EH registration node. Set by
/// WinEHStatePass and used indirectly by SEH filter functions of the parent.
int EHRegNodeEscapeIndex = INT_MAX;
WinEHFuncInfo() {}
};
/// Analyze the IR in ParentFn and it's handlers to build WinEHFuncInfo, which
/// describes the state numbers and tables used by __CxxFrameHandler3. This
/// analysis assumes that WinEHPrepare has already been run.
void calculateWinCXXEHStateNumbers(const Function *ParentFn,
WinEHFuncInfo &FuncInfo);
}
#endif // LLVM_CODEGEN_WINEHFUNCINFO_H
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