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https://github.com/c64scene-ar/llvm-6502.git
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095271bcf4
DwarfException served as a base class for exception handling directive emission. However, this is also used by other exception models (e.g. Win64EH). Rename this class to EHStreamer and split it out of DwarfException.h. NFC. Use the opportunity to fix up some of the documentation comments to match current LLVM style. Also rename some functions to conform better with current LLVM coding style. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210622 91177308-0d34-0410-b5e6-96231b3b80d8
115 lines
3.9 KiB
C++
115 lines
3.9 KiB
C++
//===-- CodeGen/AsmPrinter/Win64Exception.cpp - Dwarf Exception Impl ------===//
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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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//
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// This file contains support for writing Win64 exception info into asm files.
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfException.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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using namespace llvm;
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Win64Exception::Win64Exception(AsmPrinter *A)
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: EHStreamer(A), shouldEmitPersonality(false), shouldEmitLSDA(false),
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shouldEmitMoves(false) {}
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Win64Exception::~Win64Exception() {}
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/// endModule - Emit all exception information that should come after the
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/// content.
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void Win64Exception::endModule() {
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}
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/// beginFunction - Gather pre-function exception information. Assumes it's
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/// being emitted immediately after the function entry point.
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void Win64Exception::beginFunction(const MachineFunction *MF) {
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shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
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// If any landing pads survive, we need an EH table.
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bool hasLandingPads = !MMI->getLandingPads().empty();
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shouldEmitMoves = Asm->needsSEHMoves();
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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unsigned PerEncoding = TLOF.getPersonalityEncoding();
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const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
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shouldEmitPersonality = hasLandingPads &&
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PerEncoding != dwarf::DW_EH_PE_omit && Per;
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unsigned LSDAEncoding = TLOF.getLSDAEncoding();
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shouldEmitLSDA = shouldEmitPersonality &&
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LSDAEncoding != dwarf::DW_EH_PE_omit;
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if (!shouldEmitPersonality && !shouldEmitMoves)
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return;
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Asm->OutStreamer.EmitWin64EHStartProc(Asm->CurrentFnSym);
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if (!shouldEmitPersonality)
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return;
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MCSymbol *GCCHandlerSym =
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Asm->GetExternalSymbolSymbol("_GCC_specific_handler");
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Asm->OutStreamer.EmitWin64EHHandler(GCCHandlerSym, true, true);
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
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Asm->getFunctionNumber()));
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}
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/// endFunction - Gather and emit post-function exception information.
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///
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void Win64Exception::endFunction(const MachineFunction *) {
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if (!shouldEmitPersonality && !shouldEmitMoves)
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return;
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
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Asm->getFunctionNumber()));
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// Map all labels and get rid of any dead landing pads.
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MMI->TidyLandingPads();
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if (shouldEmitPersonality) {
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
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const MCSymbol *Sym =
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TLOF.getCFIPersonalitySymbol(Per, *Asm->Mang, Asm->TM, MMI);
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Asm->OutStreamer.PushSection();
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Asm->OutStreamer.EmitWin64EHHandlerData();
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Asm->OutStreamer.EmitValue(MCSymbolRefExpr::Create(Sym, Asm->OutContext),
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4);
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emitExceptionTable();
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Asm->OutStreamer.PopSection();
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}
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Asm->OutStreamer.EmitWin64EHEndProc();
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}
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