Line data    Source code

       1             : //===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI Exception Impl ----===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file contains support for writing DWARF exception info into asm files.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #include "DwarfException.h"
      15             : #include "llvm/ADT/Twine.h"
      16             : #include "llvm/CodeGen/AsmPrinter.h"
      17             : #include "llvm/CodeGen/MachineFunction.h"
      18             : #include "llvm/IR/DataLayout.h"
      19             : #include "llvm/IR/Mangler.h"
      20             : #include "llvm/IR/Module.h"
      21             : #include "llvm/MC/MCAsmInfo.h"
      22             : #include "llvm/MC/MCExpr.h"
      23             : #include "llvm/MC/MCSection.h"
      24             : #include "llvm/MC/MCStreamer.h"
      25             : #include "llvm/MC/MCSymbol.h"
      26             : #include "llvm/Support/FormattedStream.h"
      27             : #include "llvm/Target/TargetOptions.h"
      28             : using namespace llvm;
      29             : 
      30        1959 : ARMException::ARMException(AsmPrinter *A) : DwarfCFIExceptionBase(A) {}
      31             : 
      32        1934 : ARMException::~ARMException() {}
      33             : 
      34           0 : ARMTargetStreamer &ARMException::getTargetStreamer() {
      35       11815 :   MCTargetStreamer &TS = *Asm->OutStreamer->getTargetStreamer();
      36           0 :   return static_cast<ARMTargetStreamer &>(TS);
      37             : }
      38             : 
      39       11815 : void ARMException::beginFunction(const MachineFunction *MF) {
      40       11815 :   if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
      41       11815 :     getTargetStreamer().emitFnStart();
      42             :   // See if we need call frame info.
      43       11815 :   AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
      44             :   assert(MoveType != AsmPrinter::CFI_M_EH &&
      45             :          "non-EH CFI not yet supported in prologue with EHABI lowering");
      46             : 
      47       11815 :   if (MoveType == AsmPrinter::CFI_M_Debug) {
      48          59 :     if (!hasEmittedCFISections) {
      49          31 :       if (Asm->needsOnlyDebugCFIMoves())
      50          31 :         Asm->OutStreamer->EmitCFISections(false, true);
      51          31 :       hasEmittedCFISections = true;
      52             :     }
      53             : 
      54          59 :     shouldEmitCFI = true;
      55         118 :     Asm->OutStreamer->EmitCFIStartProc(false);
      56             :   }
      57       11815 : }
      58             : 
      59             : /// endFunction - Gather and emit post-function exception information.
      60             : ///
      61       11815 : void ARMException::endFunction(const MachineFunction *MF) {
      62             :   ARMTargetStreamer &ATS = getTargetStreamer();
      63       11815 :   const Function &F = MF->getFunction();
      64             :   const Function *Per = nullptr;
      65       11815 :   if (F.hasPersonalityFn())
      66          31 :     Per = dyn_cast<Function>(F.getPersonalityFn()->stripPointerCasts());
      67             :   bool forceEmitPersonality =
      68       11816 :     F.hasPersonalityFn() && !isNoOpWithoutInvoke(classifyEHPersonality(Per)) &&
      69           1 :     F.needsUnwindTableEntry();
      70       11814 :   bool shouldEmitPersonality = forceEmitPersonality ||
      71             :     !MF->getLandingPads().empty();
      72       11815 :   if (!Asm->MF->getFunction().needsUnwindTableEntry() &&
      73             :       !shouldEmitPersonality)
      74        3869 :     ATS.emitCantUnwind();
      75        7946 :   else if (shouldEmitPersonality) {
      76             :     // Emit references to personality.
      77          31 :     if (Per) {
      78          31 :       MCSymbol *PerSym = Asm->getSymbol(Per);
      79          62 :       Asm->OutStreamer->EmitSymbolAttribute(PerSym, MCSA_Global);
      80          31 :       ATS.emitPersonality(PerSym);
      81             :     }
      82             : 
      83             :     // Emit .handlerdata directive.
      84          31 :     ATS.emitHandlerData();
      85             : 
      86             :     // Emit actual exception table
      87          31 :     emitExceptionTable();
      88             :   }
      89             : 
      90       11815 :   if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
      91       11815 :     ATS.emitFnEnd();
      92       11815 : }
      93             : 
      94          30 : void ARMException::emitTypeInfos(unsigned TTypeEncoding,
      95             :                                  MCSymbol *TTBaseLabel) {
      96          30 :   const MachineFunction *MF = Asm->MF;
      97             :   const std::vector<const GlobalValue *> &TypeInfos = MF->getTypeInfos();
      98             :   const std::vector<unsigned> &FilterIds = MF->getFilterIds();
      99             : 
     100          30 :   bool VerboseAsm = Asm->OutStreamer->isVerboseAsm();
     101             : 
     102             :   int Entry = 0;
     103             :   // Emit the Catch TypeInfos.
     104          30 :   if (VerboseAsm && !TypeInfos.empty()) {
     105          87 :     Asm->OutStreamer->AddComment(">> Catch TypeInfos <<");
     106          58 :     Asm->OutStreamer->AddBlankLine();
     107          58 :     Entry = TypeInfos.size();
     108             :   }
     109             : 
     110          60 :   for (const GlobalValue *GV : reverse(TypeInfos)) {
     111          30 :     if (VerboseAsm)
     112          58 :       Asm->OutStreamer->AddComment("TypeInfo " + Twine(Entry--));
     113          30 :     Asm->EmitTTypeReference(GV, TTypeEncoding);
     114             :   }
     115             : 
     116          60 :   Asm->OutStreamer->EmitLabel(TTBaseLabel);
     117             : 
     118             :   // Emit the Exception Specifications.
     119          30 :   if (VerboseAsm && !FilterIds.empty()) {
     120           3 :     Asm->OutStreamer->AddComment(">> Filter TypeInfos <<");
     121           2 :     Asm->OutStreamer->AddBlankLine();
     122             :     Entry = 0;
     123             :   }
     124             :   for (std::vector<unsigned>::const_iterator
     125          32 :          I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
     126           2 :     unsigned TypeID = *I;
     127           2 :     if (VerboseAsm) {
     128           2 :       --Entry;
     129           2 :       if (TypeID != 0)
     130           2 :         Asm->OutStreamer->AddComment("FilterInfo " + Twine(Entry));
     131             :     }
     132             : 
     133           2 :     Asm->EmitTTypeReference((TypeID == 0 ? nullptr : TypeInfos[TypeID - 1]),
     134             :                             TTypeEncoding);
     135             :   }
     136          30 : }