6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
112 lines
3.2 KiB
C++
112 lines
3.2 KiB
C++
//===- MCWinEH.h - Windows Unwinding Support --------------------*- 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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#ifndef LLVM_MC_MCWINEH_H
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#define LLVM_MC_MCWINEH_H
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#include "llvm/ADT/MapVector.h"
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#include <vector>
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namespace llvm {
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class MCSection;
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class MCStreamer;
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class MCSymbol;
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namespace WinEH {
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struct Instruction {
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const MCSymbol *Label;
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unsigned Offset;
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unsigned Register;
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unsigned Operation;
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Instruction(unsigned Op, MCSymbol *L, unsigned Reg, unsigned Off)
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: Label(L), Offset(Off), Register(Reg), Operation(Op) {}
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bool operator==(const Instruction &I) const {
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// Check whether two instructions refer to the same operation
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// applied at a different spot (i.e. pointing at a different label).
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return Offset == I.Offset && Register == I.Register &&
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Operation == I.Operation;
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}
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bool operator!=(const Instruction &I) const { return !(*this == I); }
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};
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struct FrameInfo {
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const MCSymbol *Begin = nullptr;
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const MCSymbol *End = nullptr;
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const MCSymbol *FuncletOrFuncEnd = nullptr;
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const MCSymbol *ExceptionHandler = nullptr;
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const MCSymbol *Function = nullptr;
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const MCSymbol *PrologEnd = nullptr;
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const MCSymbol *Symbol = nullptr;
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MCSection *TextSection = nullptr;
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uint32_t PackedInfo = 0;
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uint32_t PrologCodeBytes = 0;
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bool HandlesUnwind = false;
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bool HandlesExceptions = false;
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bool EmitAttempted = false;
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bool Fragment = false;
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int LastFrameInst = -1;
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const FrameInfo *ChainedParent = nullptr;
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std::vector<Instruction> Instructions;
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struct Epilog {
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std::vector<Instruction> Instructions;
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unsigned Condition;
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MCSymbol *End;
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};
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MapVector<MCSymbol *, Epilog> EpilogMap;
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// For splitting unwind info of large functions
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struct Segment {
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int64_t Offset;
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int64_t Length;
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bool HasProlog;
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MCSymbol *Symbol = nullptr;
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// Map an Epilog's symbol to its offset within the function.
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MapVector<MCSymbol *, int64_t> Epilogs;
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Segment(int64_t Offset, int64_t Length, bool HasProlog = false)
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: Offset(Offset), Length(Length), HasProlog(HasProlog) {}
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};
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std::vector<Segment> Segments;
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FrameInfo() = default;
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FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel)
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: Begin(BeginFuncEHLabel), Function(Function) {}
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FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel,
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const FrameInfo *ChainedParent)
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: Begin(BeginFuncEHLabel), Function(Function),
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ChainedParent(ChainedParent) {}
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bool empty() const {
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if (!Instructions.empty())
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return false;
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for (const auto &E : EpilogMap)
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if (!E.second.Instructions.empty())
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return false;
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return true;
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}
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};
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class UnwindEmitter {
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public:
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virtual ~UnwindEmitter();
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/// This emits the unwind info sections (.pdata and .xdata in PE/COFF).
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virtual void Emit(MCStreamer &Streamer) const = 0;
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virtual void EmitUnwindInfo(MCStreamer &Streamer, FrameInfo *FI,
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bool HandlerData) const = 0;
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};
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}
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}
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#endif
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