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https://github.com/c64scene-ar/llvm-6502.git
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7908480e4c
This change adds an new value to the --arm-enable-ehabi option that disables emitting unwinding descriptors. This mode gives a working backtrace() without the (currently broken) exception support. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148686 91177308-0d34-0410-b5e6-96231b3b80d8
101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
//===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI 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 DWARF 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/Module.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineModuleInfo.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/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/Target/Mangler.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/FormattedStream.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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using namespace llvm;
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cl::opt<ExceptionHandling::ARMEHABIMode>
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EnableARMEHABI("arm-enable-ehabi", cl::Hidden,
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cl::desc("Generate ARM EHABI tables:"),
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cl::values(clEnumValN(ExceptionHandling::ARMEHABIDisabled, "no",
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"Do not generate ARM EHABI tables"),
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clEnumValN(ExceptionHandling::ARMEHABIUnwind, "unwind",
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"Emit unwinding instructions, but not descriptors"),
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clEnumValN(ExceptionHandling::ARMEHABIFull, "full",
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"Generate full ARM EHABI tables"),
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clEnumValEnd));
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ARMException::ARMException(AsmPrinter *A)
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: DwarfException(A),
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shouldEmitTable(false), shouldEmitMoves(false), shouldEmitTableModule(false)
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{}
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ARMException::~ARMException() {}
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void ARMException::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 ARMException::BeginFunction(const MachineFunction *MF) {
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Asm->OutStreamer.EmitFnStart();
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if (Asm->MF->getFunction()->needsUnwindTableEntry())
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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 ARMException::EndFunction() {
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if (!Asm->MF->getFunction()->needsUnwindTableEntry())
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Asm->OutStreamer.EmitCantUnwind();
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else {
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
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Asm->getFunctionNumber()));
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// Emit references to personality.
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if (const Function * Personality =
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MMI->getPersonalities()[MMI->getPersonalityIndex()]) {
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MCSymbol *PerSym = Asm->Mang->getSymbol(Personality);
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Asm->OutStreamer.EmitSymbolAttribute(PerSym, MCSA_Global);
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Asm->OutStreamer.EmitPersonality(PerSym);
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}
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if (EnableARMEHABI == ExceptionHandling::ARMEHABIFull) {
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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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Asm->OutStreamer.EmitHandlerData();
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// Emit actual exception table
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EmitExceptionTable();
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}
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}
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Asm->OutStreamer.EmitFnEnd();
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}
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