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75b594b1e8
Summary: This adds a unique ID to the COFF section uniquing map, similar to the one we have for ELF. The unique id is not currently exposed via the assembler because we don't have a use case for it yet. Users generally create .pdata with the .seh_* family of directives, and the assembler internally needs to produce .pdata and .xdata sections corresponding to the code section. The association between .text sections and the assembler-created .xdata and .pdata sections is maintained as an ID field of MCSectionCOFF. The CFI-related sections are created with the given unique ID, so if more code is added to the same text section, we can find and reuse the CFI sections that were already created. Reviewers: majnemer, rafael Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D19376 llvm-svn: 268331
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
//===- MCWinEH.h - Windows Unwinding Support --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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 <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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const unsigned Offset;
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const unsigned Register;
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const 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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};
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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 *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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const MCSection *TextSection = nullptr;
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bool HandlesUnwind = false;
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bool HandlesExceptions = 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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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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};
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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) const = 0;
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};
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}
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}
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#endif
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