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https://github.com/c64scene-ar/llvm-6502.git
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737c9f6005
r201608 made llvm corretly handle private globals with MachO. r201622 fixed a bug in it and r201624 and r201625 were changes for using private linkage, assuming that llvm would do the right thing. They all got reverted because r201608 introduced a crash in LTO. This patch includes a fix for that. The issue was that TargetLoweringObjectFile now has to be initialized before we can mangle names of private globals. This is trivially true during the normal codegen pipeline (the asm printer does it), but LTO has to do it manually. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201700 91177308-0d34-0410-b5e6-96231b3b80d8
116 lines
3.9 KiB
C++
116 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 =
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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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