6f792041a5
This reapplies 36c64af9d7f97414d48681b74352c9684077259b in updated form. Emit the xdata for each function at .seh_endproc. This keeps the exact same output header order for most code generated by the LLVM CodeGen layer. (Sections still change order for code built from assembly where functions lack an explicit .seh_handlerdata directive, and functions with chained unwind info.) The practical effect should be that assembly output lacks superfluous ".seh_handlerdata; .text" pairs at the end of functions that don't handle exceptions, which allows such functions to use the AArch64 packed unwind format again. Differential Revision: https://reviews.llvm.org/D87448
81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
//===-- X86WinCOFFStreamer.cpp - X86 Target WinCOFF Streamer ----*- 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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#include "X86MCTargetDesc.h"
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#include "X86TargetStreamer.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCWin64EH.h"
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#include "llvm/MC/MCWinCOFFStreamer.h"
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using namespace llvm;
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namespace {
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class X86WinCOFFStreamer : public MCWinCOFFStreamer {
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Win64EH::UnwindEmitter EHStreamer;
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public:
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X86WinCOFFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> AB,
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std::unique_ptr<MCCodeEmitter> CE,
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std::unique_ptr<MCObjectWriter> OW)
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: MCWinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW)) {}
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void EmitWinEHHandlerData(SMLoc Loc) override;
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void EmitWindowsUnwindTables(WinEH::FrameInfo *Frame) override;
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void EmitWindowsUnwindTables() override;
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void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc) override;
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void finishImpl() override;
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};
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void X86WinCOFFStreamer::EmitWinEHHandlerData(SMLoc Loc) {
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MCStreamer::EmitWinEHHandlerData(Loc);
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// We have to emit the unwind info now, because this directive
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// actually switches to the .xdata section.
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if (WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo())
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EHStreamer.EmitUnwindInfo(*this, CurFrame, /* HandlerData = */ true);
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}
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void X86WinCOFFStreamer::EmitWindowsUnwindTables(WinEH::FrameInfo *Frame) {
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EHStreamer.EmitUnwindInfo(*this, Frame, /* HandlerData = */ false);
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}
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void X86WinCOFFStreamer::EmitWindowsUnwindTables() {
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if (!getNumWinFrameInfos())
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return;
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EHStreamer.Emit(*this);
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}
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void X86WinCOFFStreamer::EmitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc) {
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X86TargetStreamer *XTS =
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static_cast<X86TargetStreamer *>(getTargetStreamer());
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XTS->emitFPOData(ProcSym, Loc);
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}
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void X86WinCOFFStreamer::finishImpl() {
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emitFrames(nullptr);
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EmitWindowsUnwindTables();
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MCWinCOFFStreamer::finishImpl();
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}
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} // namespace
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MCStreamer *llvm::createX86WinCOFFStreamer(MCContext &C,
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std::unique_ptr<MCAsmBackend> &&AB,
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std::unique_ptr<MCObjectWriter> &&OW,
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std::unique_ptr<MCCodeEmitter> &&CE,
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bool RelaxAll,
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bool IncrementalLinkerCompatible) {
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X86WinCOFFStreamer *S =
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new X86WinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW));
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S->getAssembler().setRelaxAll(RelaxAll);
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S->getAssembler().setIncrementalLinkerCompatible(IncrementalLinkerCompatible);
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return S;
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}
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