122 lines
4.4 KiB
C++
122 lines
4.4 KiB
C++
//===-- WinException.h - Windows Exception Handling ----------*- C++ -*--===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for writing windows exception info into asm files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_WIN64EXCEPTION_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_WIN64EXCEPTION_H
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#include "EHStreamer.h"
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#include <vector>
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namespace llvm {
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class GlobalValue;
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class MachineFunction;
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class MCExpr;
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class MCSection;
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struct WinEHFuncInfo;
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class LLVM_LIBRARY_VISIBILITY WinException : public EHStreamer {
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/// Per-function flag to indicate if personality info should be emitted.
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bool shouldEmitPersonality = false;
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/// Per-function flag to indicate if the LSDA should be emitted.
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bool shouldEmitLSDA = false;
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/// Per-function flag to indicate if frame moves info should be emitted.
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bool shouldEmitMoves = false;
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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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/// True if we are generating exception handling on Windows for ARM64.
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bool isAArch64 = false;
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/// True if we are generating exception handling on Windows for ARM (Thumb).
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bool isThumb = false;
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/// Pointer to the current funclet entry BB.
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const MachineBasicBlock *CurrentFuncletEntry = nullptr;
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/// The section of the last funclet start.
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MCSection *CurrentFuncletTextSection = nullptr;
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/// The list of symbols to add to the ehcont section
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std::vector<const MCSymbol *> EHContTargets;
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void emitCSpecificHandlerTable(const MachineFunction *MF);
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void emitSEHActionsForRange(const WinEHFuncInfo &FuncInfo,
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const MCSymbol *BeginLabel,
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const MCSymbol *EndLabel, int State);
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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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void emitCXXFrameHandler3Table(const MachineFunction *MF);
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/// Emit the EH table data for _except_handler3 and _except_handler4
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/// personality functions. These are only used on 32-bit and do not use CFI
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/// tables.
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void emitExceptHandlerTable(const MachineFunction *MF);
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void emitCLRExceptionTable(const MachineFunction *MF);
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void computeIP2StateTable(
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const MachineFunction *MF, const WinEHFuncInfo &FuncInfo,
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SmallVectorImpl<std::pair<const MCExpr *, int>> &IPToStateTable);
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/// Emits the label used with llvm.eh.recoverfp, which is used by
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/// outlined funclets.
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void emitEHRegistrationOffsetLabel(const WinEHFuncInfo &FuncInfo,
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StringRef FLinkageName);
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const MCExpr *create32bitRef(const MCSymbol *Value);
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const MCExpr *create32bitRef(const GlobalValue *GV);
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const MCExpr *getLabel(const MCSymbol *Label);
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const MCExpr *getLabelPlusOne(const MCSymbol *Label);
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const MCExpr *getOffset(const MCSymbol *OffsetOf, const MCSymbol *OffsetFrom);
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const MCExpr *getOffsetPlusOne(const MCSymbol *OffsetOf,
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const MCSymbol *OffsetFrom);
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/// Gets the offset that we should use in a table for a stack object with the
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/// given index. For targets using CFI (Win64, etc), this is relative to the
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/// established SP at the end of the prologue. For targets without CFI (Win32
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/// only), it is relative to the frame pointer.
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int getFrameIndexOffset(int FrameIndex, const WinEHFuncInfo &FuncInfo);
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void endFuncletImpl();
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public:
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//===--------------------------------------------------------------------===//
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// Main entry points.
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//
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WinException(AsmPrinter *A);
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~WinException() override;
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/// Emit all exception information that should come after the content.
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void endModule() override;
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/// Gather pre-function exception information. Assumes being emitted
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/// immediately after the function entry point.
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void beginFunction(const MachineFunction *MF) override;
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void markFunctionEnd() override;
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/// Gather and emit post-function exception information.
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void endFunction(const MachineFunction *) override;
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/// Emit target-specific EH funclet machinery.
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void beginFunclet(const MachineBasicBlock &MBB, MCSymbol *Sym) override;
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void endFunclet() override;
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};
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}
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#endif
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