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//===-- WinException.h - Windows Exception Handling ----------*- C++ -*--===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This file contains support for writing windows exception info into asm files.
#include "EHStreamer.h"
namespace llvm {
class GlobalValue;
class MachineFunction;
class MCExpr;
class MCSection;
struct WinEHFuncInfo;
class LLVM_LIBRARY_VISIBILITY WinException : public EHStreamer {
/// Per-function flag to indicate if personality info should be emitted.
bool shouldEmitPersonality = false;
/// Per-function flag to indicate if the LSDA should be emitted.
bool shouldEmitLSDA = false;
/// Per-function flag to indicate if frame moves info should be emitted.
bool shouldEmitMoves = false;
/// True if this is a 64-bit target and we should use image relative offsets.
bool useImageRel32 = false;
/// True if we are generating exception handling on Windows for ARM64.
bool isAArch64 = false;
/// Pointer to the current funclet entry BB.
const MachineBasicBlock *CurrentFuncletEntry = nullptr;
/// The section of the last funclet start.
MCSection *CurrentFuncletTextSection = nullptr;
/// The list of symbols to add to the ehcont section
std::vector<const MCSymbol *> EHContTargets;
void emitCSpecificHandlerTable(const MachineFunction *MF);
void emitSEHActionsForRange(const WinEHFuncInfo &FuncInfo,
const MCSymbol *BeginLabel,
const MCSymbol *EndLabel, int State);
/// Emit the EH table data for 32-bit and 64-bit functions using
/// the __CxxFrameHandler3 personality.
void emitCXXFrameHandler3Table(const MachineFunction *MF);
/// Emit the EH table data for _except_handler3 and _except_handler4
/// personality functions. These are only used on 32-bit and do not use CFI
/// tables.
void emitExceptHandlerTable(const MachineFunction *MF);
void emitCLRExceptionTable(const MachineFunction *MF);
void computeIP2StateTable(
const MachineFunction *MF, const WinEHFuncInfo &FuncInfo,
SmallVectorImpl<std::pair<const MCExpr *, int>> &IPToStateTable);
/// Emits the label used with, which is used by
/// outlined funclets.
void emitEHRegistrationOffsetLabel(const WinEHFuncInfo &FuncInfo,
StringRef FLinkageName);
const MCExpr *create32bitRef(const MCSymbol *Value);
const MCExpr *create32bitRef(const GlobalValue *GV);
const MCExpr *getLabel(const MCSymbol *Label);
const MCExpr *getOffset(const MCSymbol *OffsetOf, const MCSymbol *OffsetFrom);
const MCExpr *getOffsetPlusOne(const MCSymbol *OffsetOf,
const MCSymbol *OffsetFrom);
/// Gets the offset that we should use in a table for a stack object with the
/// given index. For targets using CFI (Win64, etc), this is relative to the
/// established SP at the end of the prologue. For targets without CFI (Win32
/// only), it is relative to the frame pointer.
int getFrameIndexOffset(int FrameIndex, const WinEHFuncInfo &FuncInfo);
void endFuncletImpl();
// Main entry points.
WinException(AsmPrinter *A);
~WinException() override;
/// Emit all exception information that should come after the content.
void endModule() override;
/// Gather pre-function exception information. Assumes being emitted
/// immediately after the function entry point.
void beginFunction(const MachineFunction *MF) override;
void markFunctionEnd() override;
/// Gather and emit post-function exception information.
void endFunction(const MachineFunction *) override;
/// Emit target-specific EH funclet machinery.
void beginFunclet(const MachineBasicBlock &MBB, MCSymbol *Sym) override;
void endFunclet() override;