7049fbf960
Summary: Personality routine could be an alias to another personality routine. Fix the situation when we compile the file that contains the personality routine and the file also have functions that need to refer to the personality routine. Reviewed By: hubert.reinterpretcast Differential Revision: https://reviews.llvm.org/D101401
80 lines
2.8 KiB
C++
80 lines
2.8 KiB
C++
//===-- CodeGen/AsmPrinter/AIXException.cpp - AIX Exception Impl ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for writing AIX 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/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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#include "llvm/MC/MCSectionXCOFF.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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AIXException::AIXException(AsmPrinter *A) : DwarfCFIExceptionBase(A) {}
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void AIXException::emitExceptionInfoTable(const MCSymbol *LSDA,
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const MCSymbol *PerSym) {
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// Generate EH Info Table.
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// The EH Info Table, aka, 'compat unwind section' on AIX, have the following
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// format: struct eh_info_t {
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// unsigned version; /* EH info verion 0 */
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// #if defined(__64BIT__)
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// char _pad[4]; /* padding */
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// #endif
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// unsigned long lsda; /* Pointer to LSDA */
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// unsigned long personality; /* Pointer to the personality routine */
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// }
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Asm->OutStreamer->SwitchSection(
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Asm->getObjFileLowering().getCompactUnwindSection());
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MCSymbol *EHInfoLabel =
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TargetLoweringObjectFileXCOFF::getEHInfoTableSymbol(Asm->MF);
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Asm->OutStreamer->emitLabel(EHInfoLabel);
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// Version number.
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Asm->emitInt32(0);
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const DataLayout &DL = MMI->getModule()->getDataLayout();
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const unsigned PointerSize = DL.getPointerSize();
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// Add necessary paddings in 64 bit mode.
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Asm->OutStreamer->emitValueToAlignment(PointerSize);
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// LSDA location.
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Asm->OutStreamer->emitValue(MCSymbolRefExpr::create(LSDA, Asm->OutContext),
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PointerSize);
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// Personality routine.
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Asm->OutStreamer->emitValue(MCSymbolRefExpr::create(PerSym, Asm->OutContext),
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PointerSize);
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}
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void AIXException::endFunction(const MachineFunction *MF) {
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if (!TargetLoweringObjectFileXCOFF::ShouldEmitEHBlock(MF))
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return;
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const MCSymbol *LSDALabel = emitExceptionTable();
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const Function &F = MF->getFunction();
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assert(F.hasPersonalityFn() &&
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"Landingpads are presented, but no personality routine is found.");
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const GlobalValue *Per =
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dyn_cast<GlobalValue>(F.getPersonalityFn()->stripPointerCasts());
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const MCSymbol *PerSym = Asm->TM.getSymbol(Per);
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emitExceptionInfoTable(LSDALabel, PerSym);
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}
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} // End of namespace llvm
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