forked from OSchip/llvm-project
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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: DwarfException(A),
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shouldEmitPersonality(false), shouldEmitLSDA(false), shouldEmitMoves(false)
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{}
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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 = TLOF.getCFIPersonalitySymbol(Per, Asm->Mang, 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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