mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123476 91177308-0d34-0410-b5e6-96231b3b80d8
139 lines
4.8 KiB
C++
139 lines
4.8 KiB
C++
//===-- CodeGen/AsmPrinter/DwarfException.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 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/CodeGen/MachineLocation.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/TargetLoweringObjectFile.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/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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DwarfCFIException::DwarfCFIException(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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DwarfCFIException::~DwarfCFIException() {}
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/// EndModule - Emit all exception information that should come after the
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/// content.
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void DwarfCFIException::EndModule() {
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if (!Asm->MAI->isExceptionHandlingDwarf())
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return;
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if (!shouldEmitTableModule)
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return;
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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unsigned PerEncoding = TLOF.getPersonalityEncoding();
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// Begin eh frame section.
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Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
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// Emit references to all used personality functions
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const std::vector<const Function*> &Personalities = MMI->getPersonalities();
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for (size_t i = 0, e = Personalities.size(); i != e; ++i) {
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("personality", i));
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Asm->EmitReference(Personalities[i], PerEncoding);
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}
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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 DwarfCFIException::BeginFunction(const MachineFunction *MF) {
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shouldEmitTable = shouldEmitMoves = false;
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// If any landing pads survive, we need an EH table.
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shouldEmitTable = !MMI->getLandingPads().empty();
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// See if we need frame move info.
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shouldEmitMoves =
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!Asm->MF->getFunction()->doesNotThrow() || UnwindTablesMandatory;
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if (shouldEmitMoves || shouldEmitTable)
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// Assumes in correct section after the entry point.
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Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
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Asm->getFunctionNumber()));
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shouldEmitTableModule |= shouldEmitTable;
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if (shouldEmitMoves) {
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const TargetFrameLowering *TFL = Asm->TM.getFrameLowering();
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Asm->OutStreamer.EmitCFIStartProc();
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// Indicate locations of general callee saved registers in frame.
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std::vector<MachineMove> Moves;
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TFL->getInitialFrameState(Moves);
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Asm->EmitCFIFrameMoves(Moves);
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Asm->EmitCFIFrameMoves(MMI->getFrameMoves());
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}
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if (!shouldEmitTable)
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return;
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const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
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// Provide LSDA information.
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unsigned LSDAEncoding = TLOF.getLSDAEncoding();
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if (LSDAEncoding != dwarf::DW_EH_PE_omit)
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Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
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Asm->getFunctionNumber()),
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LSDAEncoding);
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// Indicate personality routine, if any.
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unsigned PerEncoding = TLOF.getPersonalityEncoding();
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if (PerEncoding != dwarf::DW_EH_PE_omit &&
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MMI->getPersonalities()[MMI->getPersonalityIndex()])
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Asm->OutStreamer.EmitCFIPersonality(Asm->GetTempSymbol("personality",
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MMI->getPersonalityIndex()),
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PerEncoding);
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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 DwarfCFIException::EndFunction() {
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if (!shouldEmitMoves && !shouldEmitTable) return;
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if (shouldEmitMoves)
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Asm->OutStreamer.EmitCFIEndProc();
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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 (shouldEmitTable)
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EmitExceptionTable();
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}
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