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a1e1dcabe4
SUMMARY: In order for the runtime on AIX to find the compact unwind section(EHInfo table), we would need to set the following on the traceback table: The 6th byte's longtbtable field to true to signal there is an Extended TB Table Flag. The Extended TB Table Flag to be 0x08 to signal there is an exception handling info presents. Emit the offset between ehinfo TC entry and TOC base after all other optional portions of traceback table. The patch is authored by Jason Liu. Reviewers: David Tenty, Digger Lin Differential Revision: https://reviews.llvm.org/D92766
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 Function *Per =
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dyn_cast<Function>(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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