class MCSymbol;
class MDNode;
class DwarfDebug;
-class DwarfException;
class Mangler;
class TargetLoweringObjectFile;
class DataLayout;
using namespace llvm;
ARMException::ARMException(AsmPrinter *A)
- : DwarfException(A),
- shouldEmitCFI(false) {}
+ : EHStreamer(A), shouldEmitCFI(false) {}
ARMException::~ARMException() {}
ATS.emitHandlerData();
// Emit actual exception table
- EmitExceptionTable();
+ emitExceptionTable();
}
}
ATS.emitFnEnd();
}
-void ARMException::EmitTypeInfos(unsigned TTypeEncoding) {
+void ARMException::emitTypeInfos(unsigned TTypeEncoding) {
const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
}
}
- DwarfException *DE = nullptr;
+ EHStreamer *ES = nullptr;
switch (MAI->getExceptionHandlingType()) {
case ExceptionHandling::None:
break;
case ExceptionHandling::SjLj:
case ExceptionHandling::DwarfCFI:
- DE = new DwarfCFIException(this);
+ ES = new DwarfCFIException(this);
break;
case ExceptionHandling::ARM:
- DE = new ARMException(this);
+ ES = new ARMException(this);
break;
case ExceptionHandling::Win64:
- DE = new Win64Exception(this);
+ ES = new Win64Exception(this);
break;
}
- if (DE)
- Handlers.push_back(HandlerInfo(DE, EHTimerName, DWARFGroupName));
+ if (ES)
+ Handlers.push_back(HandlerInfo(ES, EHTimerName, DWARFGroupName));
return false;
}
DwarfAccelTable.cpp
DwarfCFIException.cpp
DwarfDebug.cpp
- DwarfException.cpp
DwarfFile.cpp
DwarfStringPool.cpp
DwarfUnit.cpp
+ EHStreamer.cpp
ErlangGCPrinter.cpp
OcamlGCPrinter.cpp
Win64Exception.cpp
using namespace llvm;
DwarfCFIException::DwarfCFIException(AsmPrinter *A)
- : DwarfException(A),
- shouldEmitPersonality(false), shouldEmitLSDA(false), shouldEmitMoves(false),
- moveTypeModule(AsmPrinter::CFI_M_None) {}
+ : EHStreamer(A), shouldEmitPersonality(false), shouldEmitLSDA(false),
+ shouldEmitMoves(false), moveTypeModule(AsmPrinter::CFI_M_None) {}
DwarfCFIException::~DwarfCFIException() {}
// Map all labels and get rid of any dead landing pads.
MMI->TidyLandingPads();
- EmitExceptionTable();
+ emitExceptionTable();
}
+++ /dev/null
-//===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains support for writing DWARF exception info into asm files.
-//
-//===----------------------------------------------------------------------===//
-
-#include "DwarfException.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/ADT/Twine.h"
-#include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/Mangler.h"
-#include "llvm/IR/Module.h"
-#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCStreamer.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/Support/Dwarf.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/LEB128.h"
-#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetLoweringObjectFile.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-using namespace llvm;
-
-DwarfException::DwarfException(AsmPrinter *A)
- : Asm(A), MMI(Asm->MMI) {}
-
-DwarfException::~DwarfException() {}
-
-/// SharedTypeIds - How many leading type ids two landing pads have in common.
-unsigned DwarfException::SharedTypeIds(const LandingPadInfo *L,
- const LandingPadInfo *R) {
- const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
- unsigned LSize = LIds.size(), RSize = RIds.size();
- unsigned MinSize = LSize < RSize ? LSize : RSize;
- unsigned Count = 0;
-
- for (; Count != MinSize; ++Count)
- if (LIds[Count] != RIds[Count])
- return Count;
-
- return Count;
-}
-
-/// ComputeActionsTable - Compute the actions table and gather the first action
-/// index for each landing pad site.
-unsigned DwarfException::
-ComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*> &LandingPads,
- SmallVectorImpl<ActionEntry> &Actions,
- SmallVectorImpl<unsigned> &FirstActions) {
-
- // The action table follows the call-site table in the LSDA. The individual
- // records are of two types:
- //
- // * Catch clause
- // * Exception specification
- //
- // The two record kinds have the same format, with only small differences.
- // They are distinguished by the "switch value" field: Catch clauses
- // (TypeInfos) have strictly positive switch values, and exception
- // specifications (FilterIds) have strictly negative switch values. Value 0
- // indicates a catch-all clause.
- //
- // Negative type IDs index into FilterIds. Positive type IDs index into
- // TypeInfos. The value written for a positive type ID is just the type ID
- // itself. For a negative type ID, however, the value written is the
- // (negative) byte offset of the corresponding FilterIds entry. The byte
- // offset is usually equal to the type ID (because the FilterIds entries are
- // written using a variable width encoding, which outputs one byte per entry
- // as long as the value written is not too large) but can differ. This kind
- // of complication does not occur for positive type IDs because type infos are
- // output using a fixed width encoding. FilterOffsets[i] holds the byte
- // offset corresponding to FilterIds[i].
-
- const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
- SmallVector<int, 16> FilterOffsets;
- FilterOffsets.reserve(FilterIds.size());
- int Offset = -1;
-
- for (std::vector<unsigned>::const_iterator
- I = FilterIds.begin(), E = FilterIds.end(); I != E; ++I) {
- FilterOffsets.push_back(Offset);
- Offset -= getULEB128Size(*I);
- }
-
- FirstActions.reserve(LandingPads.size());
-
- int FirstAction = 0;
- unsigned SizeActions = 0;
- const LandingPadInfo *PrevLPI = nullptr;
-
- for (SmallVectorImpl<const LandingPadInfo *>::const_iterator
- I = LandingPads.begin(), E = LandingPads.end(); I != E; ++I) {
- const LandingPadInfo *LPI = *I;
- const std::vector<int> &TypeIds = LPI->TypeIds;
- unsigned NumShared = PrevLPI ? SharedTypeIds(LPI, PrevLPI) : 0;
- unsigned SizeSiteActions = 0;
-
- if (NumShared < TypeIds.size()) {
- unsigned SizeAction = 0;
- unsigned PrevAction = (unsigned)-1;
-
- if (NumShared) {
- unsigned SizePrevIds = PrevLPI->TypeIds.size();
- assert(Actions.size());
- PrevAction = Actions.size() - 1;
- SizeAction = getSLEB128Size(Actions[PrevAction].NextAction) +
- getSLEB128Size(Actions[PrevAction].ValueForTypeID);
-
- for (unsigned j = NumShared; j != SizePrevIds; ++j) {
- assert(PrevAction != (unsigned)-1 && "PrevAction is invalid!");
- SizeAction -= getSLEB128Size(Actions[PrevAction].ValueForTypeID);
- SizeAction += -Actions[PrevAction].NextAction;
- PrevAction = Actions[PrevAction].Previous;
- }
- }
-
- // Compute the actions.
- for (unsigned J = NumShared, M = TypeIds.size(); J != M; ++J) {
- int TypeID = TypeIds[J];
- assert(-1 - TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
- int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
- unsigned SizeTypeID = getSLEB128Size(ValueForTypeID);
-
- int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
- SizeAction = SizeTypeID + getSLEB128Size(NextAction);
- SizeSiteActions += SizeAction;
-
- ActionEntry Action = { ValueForTypeID, NextAction, PrevAction };
- Actions.push_back(Action);
- PrevAction = Actions.size() - 1;
- }
-
- // Record the first action of the landing pad site.
- FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
- } // else identical - re-use previous FirstAction
-
- // Information used when created the call-site table. The action record
- // field of the call site record is the offset of the first associated
- // action record, relative to the start of the actions table. This value is
- // biased by 1 (1 indicating the start of the actions table), and 0
- // indicates that there are no actions.
- FirstActions.push_back(FirstAction);
-
- // Compute this sites contribution to size.
- SizeActions += SizeSiteActions;
-
- PrevLPI = LPI;
- }
-
- return SizeActions;
-}
-
-/// CallToNoUnwindFunction - Return `true' if this is a call to a function
-/// marked `nounwind'. Return `false' otherwise.
-bool DwarfException::CallToNoUnwindFunction(const MachineInstr *MI) {
- assert(MI->isCall() && "This should be a call instruction!");
-
- bool MarkedNoUnwind = false;
- bool SawFunc = false;
-
- for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
- const MachineOperand &MO = MI->getOperand(I);
-
- if (!MO.isGlobal()) continue;
-
- const Function *F = dyn_cast<Function>(MO.getGlobal());
- if (!F) continue;
-
- if (SawFunc) {
- // Be conservative. If we have more than one function operand for this
- // call, then we can't make the assumption that it's the callee and
- // not a parameter to the call.
- //
- // FIXME: Determine if there's a way to say that `F' is the callee or
- // parameter.
- MarkedNoUnwind = false;
- break;
- }
-
- MarkedNoUnwind = F->doesNotThrow();
- SawFunc = true;
- }
-
- return MarkedNoUnwind;
-}
-
-/// ComputeCallSiteTable - Compute the call-site table. The entry for an invoke
-/// has a try-range containing the call, a non-zero landing pad, and an
-/// appropriate action. The entry for an ordinary call has a try-range
-/// containing the call and zero for the landing pad and the action. Calls
-/// marked 'nounwind' have no entry and must not be contained in the try-range
-/// of any entry - they form gaps in the table. Entries must be ordered by
-/// try-range address.
-void DwarfException::
-ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
- const RangeMapType &PadMap,
- const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
- const SmallVectorImpl<unsigned> &FirstActions) {
- // The end label of the previous invoke or nounwind try-range.
- MCSymbol *LastLabel = nullptr;
-
- // Whether there is a potentially throwing instruction (currently this means
- // an ordinary call) between the end of the previous try-range and now.
- bool SawPotentiallyThrowing = false;
-
- // Whether the last CallSite entry was for an invoke.
- bool PreviousIsInvoke = false;
-
- // Visit all instructions in order of address.
- for (const auto &MBB : *Asm->MF) {
- for (const auto &MI : MBB) {
- if (!MI.isEHLabel()) {
- if (MI.isCall())
- SawPotentiallyThrowing |= !CallToNoUnwindFunction(&MI);
- continue;
- }
-
- // End of the previous try-range?
- MCSymbol *BeginLabel = MI.getOperand(0).getMCSymbol();
- if (BeginLabel == LastLabel)
- SawPotentiallyThrowing = false;
-
- // Beginning of a new try-range?
- RangeMapType::const_iterator L = PadMap.find(BeginLabel);
- if (L == PadMap.end())
- // Nope, it was just some random label.
- continue;
-
- const PadRange &P = L->second;
- const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
- assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
- "Inconsistent landing pad map!");
-
- // For Dwarf exception handling (SjLj handling doesn't use this). If some
- // instruction between the previous try-range and this one may throw,
- // create a call-site entry with no landing pad for the region between the
- // try-ranges.
- if (SawPotentiallyThrowing && Asm->MAI->isExceptionHandlingDwarf()) {
- CallSiteEntry Site = { LastLabel, BeginLabel, nullptr, 0 };
- CallSites.push_back(Site);
- PreviousIsInvoke = false;
- }
-
- LastLabel = LandingPad->EndLabels[P.RangeIndex];
- assert(BeginLabel && LastLabel && "Invalid landing pad!");
-
- if (!LandingPad->LandingPadLabel) {
- // Create a gap.
- PreviousIsInvoke = false;
- } else {
- // This try-range is for an invoke.
- CallSiteEntry Site = {
- BeginLabel,
- LastLabel,
- LandingPad->LandingPadLabel,
- FirstActions[P.PadIndex]
- };
-
- // Try to merge with the previous call-site. SJLJ doesn't do this
- if (PreviousIsInvoke && Asm->MAI->isExceptionHandlingDwarf()) {
- CallSiteEntry &Prev = CallSites.back();
- if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
- // Extend the range of the previous entry.
- Prev.EndLabel = Site.EndLabel;
- continue;
- }
- }
-
- // Otherwise, create a new call-site.
- if (Asm->MAI->isExceptionHandlingDwarf())
- CallSites.push_back(Site);
- else {
- // SjLj EH must maintain the call sites in the order assigned
- // to them by the SjLjPrepare pass.
- unsigned SiteNo = MMI->getCallSiteBeginLabel(BeginLabel);
- if (CallSites.size() < SiteNo)
- CallSites.resize(SiteNo);
- CallSites[SiteNo - 1] = Site;
- }
- PreviousIsInvoke = true;
- }
- }
- }
-
- // If some instruction between the previous try-range and the end of the
- // function may throw, create a call-site entry with no landing pad for the
- // region following the try-range.
- if (SawPotentiallyThrowing && Asm->MAI->isExceptionHandlingDwarf()) {
- CallSiteEntry Site = { LastLabel, nullptr, nullptr, 0 };
- CallSites.push_back(Site);
- }
-}
-
-/// EmitExceptionTable - Emit landing pads and actions.
-///
-/// The general organization of the table is complex, but the basic concepts are
-/// easy. First there is a header which describes the location and organization
-/// of the three components that follow.
-///
-/// 1. The landing pad site information describes the range of code covered by
-/// the try. In our case it's an accumulation of the ranges covered by the
-/// invokes in the try. There is also a reference to the landing pad that
-/// handles the exception once processed. Finally an index into the actions
-/// table.
-/// 2. The action table, in our case, is composed of pairs of type IDs and next
-/// action offset. Starting with the action index from the landing pad
-/// site, each type ID is checked for a match to the current exception. If
-/// it matches then the exception and type id are passed on to the landing
-/// pad. Otherwise the next action is looked up. This chain is terminated
-/// with a next action of zero. If no type id is found then the frame is
-/// unwound and handling continues.
-/// 3. Type ID table contains references to all the C++ typeinfo for all
-/// catches in the function. This tables is reverse indexed base 1.
-void DwarfException::EmitExceptionTable() {
- const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
- const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
- const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
-
- // Sort the landing pads in order of their type ids. This is used to fold
- // duplicate actions.
- SmallVector<const LandingPadInfo *, 64> LandingPads;
- LandingPads.reserve(PadInfos.size());
-
- for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
- LandingPads.push_back(&PadInfos[i]);
-
- // Order landing pads lexicographically by type id.
- std::sort(LandingPads.begin(), LandingPads.end(),
- [](const LandingPadInfo *L,
- const LandingPadInfo *R) { return L->TypeIds < R->TypeIds; });
-
- // Compute the actions table and gather the first action index for each
- // landing pad site.
- SmallVector<ActionEntry, 32> Actions;
- SmallVector<unsigned, 64> FirstActions;
- unsigned SizeActions=ComputeActionsTable(LandingPads, Actions, FirstActions);
-
- // Invokes and nounwind calls have entries in PadMap (due to being bracketed
- // by try-range labels when lowered). Ordinary calls do not, so appropriate
- // try-ranges for them need be deduced when using DWARF exception handling.
- RangeMapType PadMap;
- for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
- const LandingPadInfo *LandingPad = LandingPads[i];
- for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
- MCSymbol *BeginLabel = LandingPad->BeginLabels[j];
- assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
- PadRange P = { i, j };
- PadMap[BeginLabel] = P;
- }
- }
-
- // Compute the call-site table.
- SmallVector<CallSiteEntry, 64> CallSites;
- ComputeCallSiteTable(CallSites, PadMap, LandingPads, FirstActions);
-
- // Final tallies.
-
- // Call sites.
- bool IsSJLJ = Asm->MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
- bool HaveTTData = IsSJLJ ? (!TypeInfos.empty() || !FilterIds.empty()) : true;
-
- unsigned CallSiteTableLength;
- if (IsSJLJ)
- CallSiteTableLength = 0;
- else {
- unsigned SiteStartSize = 4; // dwarf::DW_EH_PE_udata4
- unsigned SiteLengthSize = 4; // dwarf::DW_EH_PE_udata4
- unsigned LandingPadSize = 4; // dwarf::DW_EH_PE_udata4
- CallSiteTableLength =
- CallSites.size() * (SiteStartSize + SiteLengthSize + LandingPadSize);
- }
-
- for (unsigned i = 0, e = CallSites.size(); i < e; ++i) {
- CallSiteTableLength += getULEB128Size(CallSites[i].Action);
- if (IsSJLJ)
- CallSiteTableLength += getULEB128Size(i);
- }
-
- // Type infos.
- const MCSection *LSDASection = Asm->getObjFileLowering().getLSDASection();
- unsigned TTypeEncoding;
- unsigned TypeFormatSize;
-
- if (!HaveTTData) {
- // For SjLj exceptions, if there is no TypeInfo, then we just explicitly say
- // that we're omitting that bit.
- TTypeEncoding = dwarf::DW_EH_PE_omit;
- // dwarf::DW_EH_PE_absptr
- TypeFormatSize = Asm->getDataLayout().getPointerSize();
- } else {
- // Okay, we have actual filters or typeinfos to emit. As such, we need to
- // pick a type encoding for them. We're about to emit a list of pointers to
- // typeinfo objects at the end of the LSDA. However, unless we're in static
- // mode, this reference will require a relocation by the dynamic linker.
- //
- // Because of this, we have a couple of options:
- //
- // 1) If we are in -static mode, we can always use an absolute reference
- // from the LSDA, because the static linker will resolve it.
- //
- // 2) Otherwise, if the LSDA section is writable, we can output the direct
- // reference to the typeinfo and allow the dynamic linker to relocate
- // it. Since it is in a writable section, the dynamic linker won't
- // have a problem.
- //
- // 3) Finally, if we're in PIC mode and the LDSA section isn't writable,
- // we need to use some form of indirection. For example, on Darwin,
- // we can output a statically-relocatable reference to a dyld stub. The
- // offset to the stub is constant, but the contents are in a section
- // that is updated by the dynamic linker. This is easy enough, but we
- // need to tell the personality function of the unwinder to indirect
- // through the dyld stub.
- //
- // FIXME: When (3) is actually implemented, we'll have to emit the stubs
- // somewhere. This predicate should be moved to a shared location that is
- // in target-independent code.
- //
- TTypeEncoding = Asm->getObjFileLowering().getTTypeEncoding();
- TypeFormatSize = Asm->GetSizeOfEncodedValue(TTypeEncoding);
- }
-
- // Begin the exception table.
- // Sometimes we want not to emit the data into separate section (e.g. ARM
- // EHABI). In this case LSDASection will be NULL.
- if (LSDASection)
- Asm->OutStreamer.SwitchSection(LSDASection);
- Asm->EmitAlignment(2);
-
- // Emit the LSDA.
- MCSymbol *GCCETSym =
- Asm->OutContext.GetOrCreateSymbol(Twine("GCC_except_table")+
- Twine(Asm->getFunctionNumber()));
- Asm->OutStreamer.EmitLabel(GCCETSym);
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("exception",
- Asm->getFunctionNumber()));
-
- if (IsSJLJ)
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("_LSDA_",
- Asm->getFunctionNumber()));
-
- // Emit the LSDA header.
- Asm->EmitEncodingByte(dwarf::DW_EH_PE_omit, "@LPStart");
- Asm->EmitEncodingByte(TTypeEncoding, "@TType");
-
- // The type infos need to be aligned. GCC does this by inserting padding just
- // before the type infos. However, this changes the size of the exception
- // table, so you need to take this into account when you output the exception
- // table size. However, the size is output using a variable length encoding.
- // So by increasing the size by inserting padding, you may increase the number
- // of bytes used for writing the size. If it increases, say by one byte, then
- // you now need to output one less byte of padding to get the type infos
- // aligned. However this decreases the size of the exception table. This
- // changes the value you have to output for the exception table size. Due to
- // the variable length encoding, the number of bytes used for writing the
- // length may decrease. If so, you then have to increase the amount of
- // padding. And so on. If you look carefully at the GCC code you will see that
- // it indeed does this in a loop, going on and on until the values stabilize.
- // We chose another solution: don't output padding inside the table like GCC
- // does, instead output it before the table.
- unsigned SizeTypes = TypeInfos.size() * TypeFormatSize;
- unsigned CallSiteTableLengthSize = getULEB128Size(CallSiteTableLength);
- unsigned TTypeBaseOffset =
- sizeof(int8_t) + // Call site format
- CallSiteTableLengthSize + // Call site table length size
- CallSiteTableLength + // Call site table length
- SizeActions + // Actions size
- SizeTypes;
- unsigned TTypeBaseOffsetSize = getULEB128Size(TTypeBaseOffset);
- unsigned TotalSize =
- sizeof(int8_t) + // LPStart format
- sizeof(int8_t) + // TType format
- (HaveTTData ? TTypeBaseOffsetSize : 0) + // TType base offset size
- TTypeBaseOffset; // TType base offset
- unsigned SizeAlign = (4 - TotalSize) & 3;
-
- if (HaveTTData) {
- // Account for any extra padding that will be added to the call site table
- // length.
- Asm->EmitULEB128(TTypeBaseOffset, "@TType base offset", SizeAlign);
- SizeAlign = 0;
- }
-
- bool VerboseAsm = Asm->OutStreamer.isVerboseAsm();
-
- // SjLj Exception handling
- if (IsSJLJ) {
- Asm->EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
-
- // Add extra padding if it wasn't added to the TType base offset.
- Asm->EmitULEB128(CallSiteTableLength, "Call site table length", SizeAlign);
-
- // Emit the landing pad site information.
- unsigned idx = 0;
- for (SmallVectorImpl<CallSiteEntry>::const_iterator
- I = CallSites.begin(), E = CallSites.end(); I != E; ++I, ++idx) {
- const CallSiteEntry &S = *I;
-
- // Offset of the landing pad, counted in 16-byte bundles relative to the
- // @LPStart address.
- if (VerboseAsm) {
- Asm->OutStreamer.AddComment(">> Call Site " + Twine(idx) + " <<");
- Asm->OutStreamer.AddComment(" On exception at call site "+Twine(idx));
- }
- Asm->EmitULEB128(idx);
-
- // Offset of the first associated action record, relative to the start of
- // the action table. This value is biased by 1 (1 indicates the start of
- // the action table), and 0 indicates that there are no actions.
- if (VerboseAsm) {
- if (S.Action == 0)
- Asm->OutStreamer.AddComment(" Action: cleanup");
- else
- Asm->OutStreamer.AddComment(" Action: " +
- Twine((S.Action - 1) / 2 + 1));
- }
- Asm->EmitULEB128(S.Action);
- }
- } else {
- // DWARF Exception handling
- assert(Asm->MAI->isExceptionHandlingDwarf());
-
- // The call-site table is a list of all call sites that may throw an
- // exception (including C++ 'throw' statements) in the procedure
- // fragment. It immediately follows the LSDA header. Each entry indicates,
- // for a given call, the first corresponding action record and corresponding
- // landing pad.
- //
- // The table begins with the number of bytes, stored as an LEB128
- // compressed, unsigned integer. The records immediately follow the record
- // count. They are sorted in increasing call-site address. Each record
- // indicates:
- //
- // * The position of the call-site.
- // * The position of the landing pad.
- // * The first action record for that call site.
- //
- // A missing entry in the call-site table indicates that a call is not
- // supposed to throw.
-
- // Emit the landing pad call site table.
- Asm->EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
-
- // Add extra padding if it wasn't added to the TType base offset.
- Asm->EmitULEB128(CallSiteTableLength, "Call site table length", SizeAlign);
-
- unsigned Entry = 0;
- for (SmallVectorImpl<CallSiteEntry>::const_iterator
- I = CallSites.begin(), E = CallSites.end(); I != E; ++I) {
- const CallSiteEntry &S = *I;
-
- MCSymbol *EHFuncBeginSym =
- Asm->GetTempSymbol("eh_func_begin", Asm->getFunctionNumber());
-
- MCSymbol *BeginLabel = S.BeginLabel;
- if (!BeginLabel)
- BeginLabel = EHFuncBeginSym;
- MCSymbol *EndLabel = S.EndLabel;
- if (!EndLabel)
- EndLabel = Asm->GetTempSymbol("eh_func_end", Asm->getFunctionNumber());
-
-
- // Offset of the call site relative to the previous call site, counted in
- // number of 16-byte bundles. The first call site is counted relative to
- // the start of the procedure fragment.
- if (VerboseAsm)
- Asm->OutStreamer.AddComment(">> Call Site " + Twine(++Entry) + " <<");
- Asm->EmitLabelDifference(BeginLabel, EHFuncBeginSym, 4);
- if (VerboseAsm)
- Asm->OutStreamer.AddComment(Twine(" Call between ") +
- BeginLabel->getName() + " and " +
- EndLabel->getName());
- Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
-
- // Offset of the landing pad, counted in 16-byte bundles relative to the
- // @LPStart address.
- if (!S.PadLabel) {
- if (VerboseAsm)
- Asm->OutStreamer.AddComment(" has no landing pad");
- Asm->OutStreamer.EmitIntValue(0, 4/*size*/);
- } else {
- if (VerboseAsm)
- Asm->OutStreamer.AddComment(Twine(" jumps to ") +
- S.PadLabel->getName());
- Asm->EmitLabelDifference(S.PadLabel, EHFuncBeginSym, 4);
- }
-
- // Offset of the first associated action record, relative to the start of
- // the action table. This value is biased by 1 (1 indicates the start of
- // the action table), and 0 indicates that there are no actions.
- if (VerboseAsm) {
- if (S.Action == 0)
- Asm->OutStreamer.AddComment(" On action: cleanup");
- else
- Asm->OutStreamer.AddComment(" On action: " +
- Twine((S.Action - 1) / 2 + 1));
- }
- Asm->EmitULEB128(S.Action);
- }
- }
-
- // Emit the Action Table.
- int Entry = 0;
- for (SmallVectorImpl<ActionEntry>::const_iterator
- I = Actions.begin(), E = Actions.end(); I != E; ++I) {
- const ActionEntry &Action = *I;
-
- if (VerboseAsm) {
- // Emit comments that decode the action table.
- Asm->OutStreamer.AddComment(">> Action Record " + Twine(++Entry) + " <<");
- }
-
- // Type Filter
- //
- // Used by the runtime to match the type of the thrown exception to the
- // type of the catch clauses or the types in the exception specification.
- if (VerboseAsm) {
- if (Action.ValueForTypeID > 0)
- Asm->OutStreamer.AddComment(" Catch TypeInfo " +
- Twine(Action.ValueForTypeID));
- else if (Action.ValueForTypeID < 0)
- Asm->OutStreamer.AddComment(" Filter TypeInfo " +
- Twine(Action.ValueForTypeID));
- else
- Asm->OutStreamer.AddComment(" Cleanup");
- }
- Asm->EmitSLEB128(Action.ValueForTypeID);
-
- // Action Record
- //
- // Self-relative signed displacement in bytes of the next action record,
- // or 0 if there is no next action record.
- if (VerboseAsm) {
- if (Action.NextAction == 0) {
- Asm->OutStreamer.AddComment(" No further actions");
- } else {
- unsigned NextAction = Entry + (Action.NextAction + 1) / 2;
- Asm->OutStreamer.AddComment(" Continue to action "+Twine(NextAction));
- }
- }
- Asm->EmitSLEB128(Action.NextAction);
- }
-
- EmitTypeInfos(TTypeEncoding);
-
- Asm->EmitAlignment(2);
-}
-
-void DwarfException::EmitTypeInfos(unsigned TTypeEncoding) {
- const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
- const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
-
- bool VerboseAsm = Asm->OutStreamer.isVerboseAsm();
-
- int Entry = 0;
- // Emit the Catch TypeInfos.
- if (VerboseAsm && !TypeInfos.empty()) {
- Asm->OutStreamer.AddComment(">> Catch TypeInfos <<");
- Asm->OutStreamer.AddBlankLine();
- Entry = TypeInfos.size();
- }
-
- for (std::vector<const GlobalVariable *>::const_reverse_iterator
- I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
- const GlobalVariable *GV = *I;
- if (VerboseAsm)
- Asm->OutStreamer.AddComment("TypeInfo " + Twine(Entry--));
- Asm->EmitTTypeReference(GV, TTypeEncoding);
- }
-
- // Emit the Exception Specifications.
- if (VerboseAsm && !FilterIds.empty()) {
- Asm->OutStreamer.AddComment(">> Filter TypeInfos <<");
- Asm->OutStreamer.AddBlankLine();
- Entry = 0;
- }
- for (std::vector<unsigned>::const_iterator
- I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
- unsigned TypeID = *I;
- if (VerboseAsm) {
- --Entry;
- if (TypeID != 0)
- Asm->OutStreamer.AddComment("FilterInfo " + Twine(Entry));
- }
-
- Asm->EmitULEB128(TypeID);
- }
-}
-
-/// endModule - Emit all exception information that should come after the
-/// content.
-void DwarfException::endModule() {
- llvm_unreachable("Should be implemented");
-}
-
-/// beginFunction - Gather pre-function exception information. Assumes it's
-/// being emitted immediately after the function entry point.
-void DwarfException::beginFunction(const MachineFunction *MF) {
- llvm_unreachable("Should be implemented");
-}
-
-/// endFunction - Gather and emit post-function exception information.
-void DwarfException::endFunction(const MachineFunction *) {
- llvm_unreachable("Should be implemented");
-}
#ifndef LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
#define LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
-#include "AsmPrinterHandler.h"
-#include "llvm/ADT/DenseMap.h"
+#include "EHStreamer.h"
#include "llvm/CodeGen/AsmPrinter.h"
-#include <vector>
namespace llvm {
-
-template <typename T> class SmallVectorImpl;
-struct LandingPadInfo;
-class MachineModuleInfo;
-class MachineInstr;
class MachineFunction;
-class MCAsmInfo;
-class MCExpr;
-class MCSymbol;
-class Function;
class ARMTargetStreamer;
-class AsmPrinter;
-
-//===----------------------------------------------------------------------===//
-/// DwarfException - Emits Dwarf exception handling directives.
-///
-class DwarfException : public AsmPrinterHandler {
-protected:
- /// Asm - Target of Dwarf emission.
- AsmPrinter *Asm;
-
- /// MMI - Collected machine module information.
- MachineModuleInfo *MMI;
-
- /// SharedTypeIds - How many leading type ids two landing pads have in common.
- static unsigned SharedTypeIds(const LandingPadInfo *L,
- const LandingPadInfo *R);
-
- /// PadRange - Structure holding a try-range and the associated landing pad.
- struct PadRange {
- // The index of the landing pad.
- unsigned PadIndex;
- // The index of the begin and end labels in the landing pad's label lists.
- unsigned RangeIndex;
- };
-
- typedef DenseMap<MCSymbol *, PadRange> RangeMapType;
-
- /// ActionEntry - Structure describing an entry in the actions table.
- struct ActionEntry {
- int ValueForTypeID; // The value to write - may not be equal to the type id.
- int NextAction;
- unsigned Previous;
- };
-
- /// CallSiteEntry - Structure describing an entry in the call-site table.
- struct CallSiteEntry {
- // The 'try-range' is BeginLabel .. EndLabel.
- MCSymbol *BeginLabel; // zero indicates the start of the function.
- MCSymbol *EndLabel; // zero indicates the end of the function.
-
- // The landing pad starts at PadLabel.
- MCSymbol *PadLabel; // zero indicates that there is no landing pad.
- unsigned Action;
- };
-
- /// ComputeActionsTable - Compute the actions table and gather the first
- /// action index for each landing pad site.
- unsigned ComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*>&LPs,
- SmallVectorImpl<ActionEntry> &Actions,
- SmallVectorImpl<unsigned> &FirstActions);
-
- /// CallToNoUnwindFunction - Return `true' if this is a call to a function
- /// marked `nounwind'. Return `false' otherwise.
- bool CallToNoUnwindFunction(const MachineInstr *MI);
-
- /// ComputeCallSiteTable - Compute the call-site table. The entry for an
- /// invoke has a try-range containing the call, a non-zero landing pad and an
- /// appropriate action. The entry for an ordinary call has a try-range
- /// containing the call and zero for the landing pad and the action. Calls
- /// marked 'nounwind' have no entry and must not be contained in the try-range
- /// of any entry - they form gaps in the table. Entries must be ordered by
- /// try-range address.
- void ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
- const RangeMapType &PadMap,
- const SmallVectorImpl<const LandingPadInfo *> &LPs,
- const SmallVectorImpl<unsigned> &FirstActions);
-
- /// EmitExceptionTable - Emit landing pads and actions.
- ///
- /// The general organization of the table is complex, but the basic concepts
- /// are easy. First there is a header which describes the location and
- /// organization of the three components that follow.
- /// 1. The landing pad site information describes the range of code covered
- /// by the try. In our case it's an accumulation of the ranges covered
- /// by the invokes in the try. There is also a reference to the landing
- /// pad that handles the exception once processed. Finally an index into
- /// the actions table.
- /// 2. The action table, in our case, is composed of pairs of type ids
- /// and next action offset. Starting with the action index from the
- /// landing pad site, each type Id is checked for a match to the current
- /// exception. If it matches then the exception and type id are passed
- /// on to the landing pad. Otherwise the next action is looked up. This
- /// chain is terminated with a next action of zero. If no type id is
- /// found the frame is unwound and handling continues.
- /// 3. Type id table contains references to all the C++ typeinfo for all
- /// catches in the function. This tables is reversed indexed base 1.
- void EmitExceptionTable();
-
- virtual void EmitTypeInfos(unsigned TTypeEncoding);
-
-public:
- //===--------------------------------------------------------------------===//
- // Main entry points.
- //
- DwarfException(AsmPrinter *A);
- virtual ~DwarfException();
-
- /// endModule - Emit all exception information that should come after the
- /// content.
- void endModule() override;
-
- /// beginFunction - Gather pre-function exception information. Assumes being
- /// emitted immediately after the function entry point.
- void beginFunction(const MachineFunction *MF) override;
-
- /// endFunction - Gather and emit post-function exception information.
- void endFunction(const MachineFunction *) override;
-
- // We don't need these.
- void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {}
- void beginInstruction(const MachineInstr *MI) override {}
- void endInstruction() override {}
-};
-class DwarfCFIException : public DwarfException {
+class DwarfCFIException : public EHStreamer {
/// shouldEmitPersonality - Per-function flag to indicate if .cfi_personality
/// should be emitted.
bool shouldEmitPersonality;
void endFunction(const MachineFunction *) override;
};
-class ARMException : public DwarfException {
- void EmitTypeInfos(unsigned TTypeEncoding) override;
+class ARMException : public EHStreamer {
+ void emitTypeInfos(unsigned TTypeEncoding) override;
ARMTargetStreamer &getTargetStreamer();
/// shouldEmitCFI - Per-function flag to indicate if frame CFI info
void endFunction(const MachineFunction *) override;
};
-class Win64Exception : public DwarfException {
+class Win64Exception : public EHStreamer {
/// shouldEmitPersonality - Per-function flag to indicate if personality
/// info should be emitted.
bool shouldEmitPersonality;
--- /dev/null
+//===-- CodeGen/AsmPrinter/EHStreamer.cpp - Exception Directive Streamer --===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing exception info into assembly files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "EHStreamer.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/IR/Function.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/LEB128.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+
+using namespace llvm;
+
+EHStreamer::EHStreamer(AsmPrinter *A) : Asm(A), MMI(Asm->MMI) {}
+
+EHStreamer::~EHStreamer() {}
+
+/// How many leading type ids two landing pads have in common.
+unsigned EHStreamer::sharedTypeIDs(const LandingPadInfo *L,
+ const LandingPadInfo *R) {
+ const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
+ unsigned LSize = LIds.size(), RSize = RIds.size();
+ unsigned MinSize = LSize < RSize ? LSize : RSize;
+ unsigned Count = 0;
+
+ for (; Count != MinSize; ++Count)
+ if (LIds[Count] != RIds[Count])
+ return Count;
+
+ return Count;
+}
+
+/// Compute the actions table and gather the first action index for each landing
+/// pad site.
+unsigned EHStreamer::
+computeActionsTable(const SmallVectorImpl<const LandingPadInfo*> &LandingPads,
+ SmallVectorImpl<ActionEntry> &Actions,
+ SmallVectorImpl<unsigned> &FirstActions) {
+
+ // The action table follows the call-site table in the LSDA. The individual
+ // records are of two types:
+ //
+ // * Catch clause
+ // * Exception specification
+ //
+ // The two record kinds have the same format, with only small differences.
+ // They are distinguished by the "switch value" field: Catch clauses
+ // (TypeInfos) have strictly positive switch values, and exception
+ // specifications (FilterIds) have strictly negative switch values. Value 0
+ // indicates a catch-all clause.
+ //
+ // Negative type IDs index into FilterIds. Positive type IDs index into
+ // TypeInfos. The value written for a positive type ID is just the type ID
+ // itself. For a negative type ID, however, the value written is the
+ // (negative) byte offset of the corresponding FilterIds entry. The byte
+ // offset is usually equal to the type ID (because the FilterIds entries are
+ // written using a variable width encoding, which outputs one byte per entry
+ // as long as the value written is not too large) but can differ. This kind
+ // of complication does not occur for positive type IDs because type infos are
+ // output using a fixed width encoding. FilterOffsets[i] holds the byte
+ // offset corresponding to FilterIds[i].
+
+ const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
+ SmallVector<int, 16> FilterOffsets;
+ FilterOffsets.reserve(FilterIds.size());
+ int Offset = -1;
+
+ for (std::vector<unsigned>::const_iterator
+ I = FilterIds.begin(), E = FilterIds.end(); I != E; ++I) {
+ FilterOffsets.push_back(Offset);
+ Offset -= getULEB128Size(*I);
+ }
+
+ FirstActions.reserve(LandingPads.size());
+
+ int FirstAction = 0;
+ unsigned SizeActions = 0;
+ const LandingPadInfo *PrevLPI = nullptr;
+
+ for (SmallVectorImpl<const LandingPadInfo *>::const_iterator
+ I = LandingPads.begin(), E = LandingPads.end(); I != E; ++I) {
+ const LandingPadInfo *LPI = *I;
+ const std::vector<int> &TypeIds = LPI->TypeIds;
+ unsigned NumShared = PrevLPI ? sharedTypeIDs(LPI, PrevLPI) : 0;
+ unsigned SizeSiteActions = 0;
+
+ if (NumShared < TypeIds.size()) {
+ unsigned SizeAction = 0;
+ unsigned PrevAction = (unsigned)-1;
+
+ if (NumShared) {
+ unsigned SizePrevIds = PrevLPI->TypeIds.size();
+ assert(Actions.size());
+ PrevAction = Actions.size() - 1;
+ SizeAction = getSLEB128Size(Actions[PrevAction].NextAction) +
+ getSLEB128Size(Actions[PrevAction].ValueForTypeID);
+
+ for (unsigned j = NumShared; j != SizePrevIds; ++j) {
+ assert(PrevAction != (unsigned)-1 && "PrevAction is invalid!");
+ SizeAction -= getSLEB128Size(Actions[PrevAction].ValueForTypeID);
+ SizeAction += -Actions[PrevAction].NextAction;
+ PrevAction = Actions[PrevAction].Previous;
+ }
+ }
+
+ // Compute the actions.
+ for (unsigned J = NumShared, M = TypeIds.size(); J != M; ++J) {
+ int TypeID = TypeIds[J];
+ assert(-1 - TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
+ int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
+ unsigned SizeTypeID = getSLEB128Size(ValueForTypeID);
+
+ int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
+ SizeAction = SizeTypeID + getSLEB128Size(NextAction);
+ SizeSiteActions += SizeAction;
+
+ ActionEntry Action = { ValueForTypeID, NextAction, PrevAction };
+ Actions.push_back(Action);
+ PrevAction = Actions.size() - 1;
+ }
+
+ // Record the first action of the landing pad site.
+ FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
+ } // else identical - re-use previous FirstAction
+
+ // Information used when created the call-site table. The action record
+ // field of the call site record is the offset of the first associated
+ // action record, relative to the start of the actions table. This value is
+ // biased by 1 (1 indicating the start of the actions table), and 0
+ // indicates that there are no actions.
+ FirstActions.push_back(FirstAction);
+
+ // Compute this sites contribution to size.
+ SizeActions += SizeSiteActions;
+
+ PrevLPI = LPI;
+ }
+
+ return SizeActions;
+}
+
+/// Return `true' if this is a call to a function marked `nounwind'. Return
+/// `false' otherwise.
+bool EHStreamer::callToNoUnwindFunction(const MachineInstr *MI) {
+ assert(MI->isCall() && "This should be a call instruction!");
+
+ bool MarkedNoUnwind = false;
+ bool SawFunc = false;
+
+ for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
+ const MachineOperand &MO = MI->getOperand(I);
+
+ if (!MO.isGlobal()) continue;
+
+ const Function *F = dyn_cast<Function>(MO.getGlobal());
+ if (!F) continue;
+
+ if (SawFunc) {
+ // Be conservative. If we have more than one function operand for this
+ // call, then we can't make the assumption that it's the callee and
+ // not a parameter to the call.
+ //
+ // FIXME: Determine if there's a way to say that `F' is the callee or
+ // parameter.
+ MarkedNoUnwind = false;
+ break;
+ }
+
+ MarkedNoUnwind = F->doesNotThrow();
+ SawFunc = true;
+ }
+
+ return MarkedNoUnwind;
+}
+
+/// Compute the call-site table. The entry for an invoke has a try-range
+/// containing the call, a non-zero landing pad, and an appropriate action. The
+/// entry for an ordinary call has a try-range containing the call and zero for
+/// the landing pad and the action. Calls marked 'nounwind' have no entry and
+/// must not be contained in the try-range of any entry - they form gaps in the
+/// table. Entries must be ordered by try-range address.
+void EHStreamer::
+computeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
+ const RangeMapType &PadMap,
+ const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
+ const SmallVectorImpl<unsigned> &FirstActions) {
+ // The end label of the previous invoke or nounwind try-range.
+ MCSymbol *LastLabel = nullptr;
+
+ // Whether there is a potentially throwing instruction (currently this means
+ // an ordinary call) between the end of the previous try-range and now.
+ bool SawPotentiallyThrowing = false;
+
+ // Whether the last CallSite entry was for an invoke.
+ bool PreviousIsInvoke = false;
+
+ // Visit all instructions in order of address.
+ for (const auto &MBB : *Asm->MF) {
+ for (const auto &MI : MBB) {
+ if (!MI.isEHLabel()) {
+ if (MI.isCall())
+ SawPotentiallyThrowing |= !callToNoUnwindFunction(&MI);
+ continue;
+ }
+
+ // End of the previous try-range?
+ MCSymbol *BeginLabel = MI.getOperand(0).getMCSymbol();
+ if (BeginLabel == LastLabel)
+ SawPotentiallyThrowing = false;
+
+ // Beginning of a new try-range?
+ RangeMapType::const_iterator L = PadMap.find(BeginLabel);
+ if (L == PadMap.end())
+ // Nope, it was just some random label.
+ continue;
+
+ const PadRange &P = L->second;
+ const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
+ assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
+ "Inconsistent landing pad map!");
+
+ // For Dwarf exception handling (SjLj handling doesn't use this). If some
+ // instruction between the previous try-range and this one may throw,
+ // create a call-site entry with no landing pad for the region between the
+ // try-ranges.
+ if (SawPotentiallyThrowing && Asm->MAI->isExceptionHandlingDwarf()) {
+ CallSiteEntry Site = { LastLabel, BeginLabel, nullptr, 0 };
+ CallSites.push_back(Site);
+ PreviousIsInvoke = false;
+ }
+
+ LastLabel = LandingPad->EndLabels[P.RangeIndex];
+ assert(BeginLabel && LastLabel && "Invalid landing pad!");
+
+ if (!LandingPad->LandingPadLabel) {
+ // Create a gap.
+ PreviousIsInvoke = false;
+ } else {
+ // This try-range is for an invoke.
+ CallSiteEntry Site = {
+ BeginLabel,
+ LastLabel,
+ LandingPad->LandingPadLabel,
+ FirstActions[P.PadIndex]
+ };
+
+ // Try to merge with the previous call-site. SJLJ doesn't do this
+ if (PreviousIsInvoke && Asm->MAI->isExceptionHandlingDwarf()) {
+ CallSiteEntry &Prev = CallSites.back();
+ if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
+ // Extend the range of the previous entry.
+ Prev.EndLabel = Site.EndLabel;
+ continue;
+ }
+ }
+
+ // Otherwise, create a new call-site.
+ if (Asm->MAI->isExceptionHandlingDwarf())
+ CallSites.push_back(Site);
+ else {
+ // SjLj EH must maintain the call sites in the order assigned
+ // to them by the SjLjPrepare pass.
+ unsigned SiteNo = MMI->getCallSiteBeginLabel(BeginLabel);
+ if (CallSites.size() < SiteNo)
+ CallSites.resize(SiteNo);
+ CallSites[SiteNo - 1] = Site;
+ }
+ PreviousIsInvoke = true;
+ }
+ }
+ }
+
+ // If some instruction between the previous try-range and the end of the
+ // function may throw, create a call-site entry with no landing pad for the
+ // region following the try-range.
+ if (SawPotentiallyThrowing && Asm->MAI->isExceptionHandlingDwarf()) {
+ CallSiteEntry Site = { LastLabel, nullptr, nullptr, 0 };
+ CallSites.push_back(Site);
+ }
+}
+
+/// Emit landing pads and actions.
+///
+/// The general organization of the table is complex, but the basic concepts are
+/// easy. First there is a header which describes the location and organization
+/// of the three components that follow.
+///
+/// 1. The landing pad site information describes the range of code covered by
+/// the try. In our case it's an accumulation of the ranges covered by the
+/// invokes in the try. There is also a reference to the landing pad that
+/// handles the exception once processed. Finally an index into the actions
+/// table.
+/// 2. The action table, in our case, is composed of pairs of type IDs and next
+/// action offset. Starting with the action index from the landing pad
+/// site, each type ID is checked for a match to the current exception. If
+/// it matches then the exception and type id are passed on to the landing
+/// pad. Otherwise the next action is looked up. This chain is terminated
+/// with a next action of zero. If no type id is found then the frame is
+/// unwound and handling continues.
+/// 3. Type ID table contains references to all the C++ typeinfo for all
+/// catches in the function. This tables is reverse indexed base 1.
+void EHStreamer::emitExceptionTable() {
+ const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
+ const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
+ const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
+
+ // Sort the landing pads in order of their type ids. This is used to fold
+ // duplicate actions.
+ SmallVector<const LandingPadInfo *, 64> LandingPads;
+ LandingPads.reserve(PadInfos.size());
+
+ for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
+ LandingPads.push_back(&PadInfos[i]);
+
+ // Order landing pads lexicographically by type id.
+ std::sort(LandingPads.begin(), LandingPads.end(),
+ [](const LandingPadInfo *L,
+ const LandingPadInfo *R) { return L->TypeIds < R->TypeIds; });
+
+ // Compute the actions table and gather the first action index for each
+ // landing pad site.
+ SmallVector<ActionEntry, 32> Actions;
+ SmallVector<unsigned, 64> FirstActions;
+ unsigned SizeActions =
+ computeActionsTable(LandingPads, Actions, FirstActions);
+
+ // Invokes and nounwind calls have entries in PadMap (due to being bracketed
+ // by try-range labels when lowered). Ordinary calls do not, so appropriate
+ // try-ranges for them need be deduced when using DWARF exception handling.
+ RangeMapType PadMap;
+ for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
+ const LandingPadInfo *LandingPad = LandingPads[i];
+ for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
+ MCSymbol *BeginLabel = LandingPad->BeginLabels[j];
+ assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
+ PadRange P = { i, j };
+ PadMap[BeginLabel] = P;
+ }
+ }
+
+ // Compute the call-site table.
+ SmallVector<CallSiteEntry, 64> CallSites;
+ computeCallSiteTable(CallSites, PadMap, LandingPads, FirstActions);
+
+ // Final tallies.
+
+ // Call sites.
+ bool IsSJLJ = Asm->MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
+ bool HaveTTData = IsSJLJ ? (!TypeInfos.empty() || !FilterIds.empty()) : true;
+
+ unsigned CallSiteTableLength;
+ if (IsSJLJ)
+ CallSiteTableLength = 0;
+ else {
+ unsigned SiteStartSize = 4; // dwarf::DW_EH_PE_udata4
+ unsigned SiteLengthSize = 4; // dwarf::DW_EH_PE_udata4
+ unsigned LandingPadSize = 4; // dwarf::DW_EH_PE_udata4
+ CallSiteTableLength =
+ CallSites.size() * (SiteStartSize + SiteLengthSize + LandingPadSize);
+ }
+
+ for (unsigned i = 0, e = CallSites.size(); i < e; ++i) {
+ CallSiteTableLength += getULEB128Size(CallSites[i].Action);
+ if (IsSJLJ)
+ CallSiteTableLength += getULEB128Size(i);
+ }
+
+ // Type infos.
+ const MCSection *LSDASection = Asm->getObjFileLowering().getLSDASection();
+ unsigned TTypeEncoding;
+ unsigned TypeFormatSize;
+
+ if (!HaveTTData) {
+ // For SjLj exceptions, if there is no TypeInfo, then we just explicitly say
+ // that we're omitting that bit.
+ TTypeEncoding = dwarf::DW_EH_PE_omit;
+ // dwarf::DW_EH_PE_absptr
+ TypeFormatSize = Asm->getDataLayout().getPointerSize();
+ } else {
+ // Okay, we have actual filters or typeinfos to emit. As such, we need to
+ // pick a type encoding for them. We're about to emit a list of pointers to
+ // typeinfo objects at the end of the LSDA. However, unless we're in static
+ // mode, this reference will require a relocation by the dynamic linker.
+ //
+ // Because of this, we have a couple of options:
+ //
+ // 1) If we are in -static mode, we can always use an absolute reference
+ // from the LSDA, because the static linker will resolve it.
+ //
+ // 2) Otherwise, if the LSDA section is writable, we can output the direct
+ // reference to the typeinfo and allow the dynamic linker to relocate
+ // it. Since it is in a writable section, the dynamic linker won't
+ // have a problem.
+ //
+ // 3) Finally, if we're in PIC mode and the LDSA section isn't writable,
+ // we need to use some form of indirection. For example, on Darwin,
+ // we can output a statically-relocatable reference to a dyld stub. The
+ // offset to the stub is constant, but the contents are in a section
+ // that is updated by the dynamic linker. This is easy enough, but we
+ // need to tell the personality function of the unwinder to indirect
+ // through the dyld stub.
+ //
+ // FIXME: When (3) is actually implemented, we'll have to emit the stubs
+ // somewhere. This predicate should be moved to a shared location that is
+ // in target-independent code.
+ //
+ TTypeEncoding = Asm->getObjFileLowering().getTTypeEncoding();
+ TypeFormatSize = Asm->GetSizeOfEncodedValue(TTypeEncoding);
+ }
+
+ // Begin the exception table.
+ // Sometimes we want not to emit the data into separate section (e.g. ARM
+ // EHABI). In this case LSDASection will be NULL.
+ if (LSDASection)
+ Asm->OutStreamer.SwitchSection(LSDASection);
+ Asm->EmitAlignment(2);
+
+ // Emit the LSDA.
+ MCSymbol *GCCETSym =
+ Asm->OutContext.GetOrCreateSymbol(Twine("GCC_except_table")+
+ Twine(Asm->getFunctionNumber()));
+ Asm->OutStreamer.EmitLabel(GCCETSym);
+ Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("exception",
+ Asm->getFunctionNumber()));
+
+ if (IsSJLJ)
+ Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("_LSDA_",
+ Asm->getFunctionNumber()));
+
+ // Emit the LSDA header.
+ Asm->EmitEncodingByte(dwarf::DW_EH_PE_omit, "@LPStart");
+ Asm->EmitEncodingByte(TTypeEncoding, "@TType");
+
+ // The type infos need to be aligned. GCC does this by inserting padding just
+ // before the type infos. However, this changes the size of the exception
+ // table, so you need to take this into account when you output the exception
+ // table size. However, the size is output using a variable length encoding.
+ // So by increasing the size by inserting padding, you may increase the number
+ // of bytes used for writing the size. If it increases, say by one byte, then
+ // you now need to output one less byte of padding to get the type infos
+ // aligned. However this decreases the size of the exception table. This
+ // changes the value you have to output for the exception table size. Due to
+ // the variable length encoding, the number of bytes used for writing the
+ // length may decrease. If so, you then have to increase the amount of
+ // padding. And so on. If you look carefully at the GCC code you will see that
+ // it indeed does this in a loop, going on and on until the values stabilize.
+ // We chose another solution: don't output padding inside the table like GCC
+ // does, instead output it before the table.
+ unsigned SizeTypes = TypeInfos.size() * TypeFormatSize;
+ unsigned CallSiteTableLengthSize = getULEB128Size(CallSiteTableLength);
+ unsigned TTypeBaseOffset =
+ sizeof(int8_t) + // Call site format
+ CallSiteTableLengthSize + // Call site table length size
+ CallSiteTableLength + // Call site table length
+ SizeActions + // Actions size
+ SizeTypes;
+ unsigned TTypeBaseOffsetSize = getULEB128Size(TTypeBaseOffset);
+ unsigned TotalSize =
+ sizeof(int8_t) + // LPStart format
+ sizeof(int8_t) + // TType format
+ (HaveTTData ? TTypeBaseOffsetSize : 0) + // TType base offset size
+ TTypeBaseOffset; // TType base offset
+ unsigned SizeAlign = (4 - TotalSize) & 3;
+
+ if (HaveTTData) {
+ // Account for any extra padding that will be added to the call site table
+ // length.
+ Asm->EmitULEB128(TTypeBaseOffset, "@TType base offset", SizeAlign);
+ SizeAlign = 0;
+ }
+
+ bool VerboseAsm = Asm->OutStreamer.isVerboseAsm();
+
+ // SjLj Exception handling
+ if (IsSJLJ) {
+ Asm->EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
+
+ // Add extra padding if it wasn't added to the TType base offset.
+ Asm->EmitULEB128(CallSiteTableLength, "Call site table length", SizeAlign);
+
+ // Emit the landing pad site information.
+ unsigned idx = 0;
+ for (SmallVectorImpl<CallSiteEntry>::const_iterator
+ I = CallSites.begin(), E = CallSites.end(); I != E; ++I, ++idx) {
+ const CallSiteEntry &S = *I;
+
+ // Offset of the landing pad, counted in 16-byte bundles relative to the
+ // @LPStart address.
+ if (VerboseAsm) {
+ Asm->OutStreamer.AddComment(">> Call Site " + Twine(idx) + " <<");
+ Asm->OutStreamer.AddComment(" On exception at call site "+Twine(idx));
+ }
+ Asm->EmitULEB128(idx);
+
+ // Offset of the first associated action record, relative to the start of
+ // the action table. This value is biased by 1 (1 indicates the start of
+ // the action table), and 0 indicates that there are no actions.
+ if (VerboseAsm) {
+ if (S.Action == 0)
+ Asm->OutStreamer.AddComment(" Action: cleanup");
+ else
+ Asm->OutStreamer.AddComment(" Action: " +
+ Twine((S.Action - 1) / 2 + 1));
+ }
+ Asm->EmitULEB128(S.Action);
+ }
+ } else {
+ // DWARF Exception handling
+ assert(Asm->MAI->isExceptionHandlingDwarf());
+
+ // The call-site table is a list of all call sites that may throw an
+ // exception (including C++ 'throw' statements) in the procedure
+ // fragment. It immediately follows the LSDA header. Each entry indicates,
+ // for a given call, the first corresponding action record and corresponding
+ // landing pad.
+ //
+ // The table begins with the number of bytes, stored as an LEB128
+ // compressed, unsigned integer. The records immediately follow the record
+ // count. They are sorted in increasing call-site address. Each record
+ // indicates:
+ //
+ // * The position of the call-site.
+ // * The position of the landing pad.
+ // * The first action record for that call site.
+ //
+ // A missing entry in the call-site table indicates that a call is not
+ // supposed to throw.
+
+ // Emit the landing pad call site table.
+ Asm->EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
+
+ // Add extra padding if it wasn't added to the TType base offset.
+ Asm->EmitULEB128(CallSiteTableLength, "Call site table length", SizeAlign);
+
+ unsigned Entry = 0;
+ for (SmallVectorImpl<CallSiteEntry>::const_iterator
+ I = CallSites.begin(), E = CallSites.end(); I != E; ++I) {
+ const CallSiteEntry &S = *I;
+
+ MCSymbol *EHFuncBeginSym =
+ Asm->GetTempSymbol("eh_func_begin", Asm->getFunctionNumber());
+
+ MCSymbol *BeginLabel = S.BeginLabel;
+ if (!BeginLabel)
+ BeginLabel = EHFuncBeginSym;
+ MCSymbol *EndLabel = S.EndLabel;
+ if (!EndLabel)
+ EndLabel = Asm->GetTempSymbol("eh_func_end", Asm->getFunctionNumber());
+
+
+ // Offset of the call site relative to the previous call site, counted in
+ // number of 16-byte bundles. The first call site is counted relative to
+ // the start of the procedure fragment.
+ if (VerboseAsm)
+ Asm->OutStreamer.AddComment(">> Call Site " + Twine(++Entry) + " <<");
+ Asm->EmitLabelDifference(BeginLabel, EHFuncBeginSym, 4);
+ if (VerboseAsm)
+ Asm->OutStreamer.AddComment(Twine(" Call between ") +
+ BeginLabel->getName() + " and " +
+ EndLabel->getName());
+ Asm->EmitLabelDifference(EndLabel, BeginLabel, 4);
+
+ // Offset of the landing pad, counted in 16-byte bundles relative to the
+ // @LPStart address.
+ if (!S.PadLabel) {
+ if (VerboseAsm)
+ Asm->OutStreamer.AddComment(" has no landing pad");
+ Asm->OutStreamer.EmitIntValue(0, 4/*size*/);
+ } else {
+ if (VerboseAsm)
+ Asm->OutStreamer.AddComment(Twine(" jumps to ") +
+ S.PadLabel->getName());
+ Asm->EmitLabelDifference(S.PadLabel, EHFuncBeginSym, 4);
+ }
+
+ // Offset of the first associated action record, relative to the start of
+ // the action table. This value is biased by 1 (1 indicates the start of
+ // the action table), and 0 indicates that there are no actions.
+ if (VerboseAsm) {
+ if (S.Action == 0)
+ Asm->OutStreamer.AddComment(" On action: cleanup");
+ else
+ Asm->OutStreamer.AddComment(" On action: " +
+ Twine((S.Action - 1) / 2 + 1));
+ }
+ Asm->EmitULEB128(S.Action);
+ }
+ }
+
+ // Emit the Action Table.
+ int Entry = 0;
+ for (SmallVectorImpl<ActionEntry>::const_iterator
+ I = Actions.begin(), E = Actions.end(); I != E; ++I) {
+ const ActionEntry &Action = *I;
+
+ if (VerboseAsm) {
+ // Emit comments that decode the action table.
+ Asm->OutStreamer.AddComment(">> Action Record " + Twine(++Entry) + " <<");
+ }
+
+ // Type Filter
+ //
+ // Used by the runtime to match the type of the thrown exception to the
+ // type of the catch clauses or the types in the exception specification.
+ if (VerboseAsm) {
+ if (Action.ValueForTypeID > 0)
+ Asm->OutStreamer.AddComment(" Catch TypeInfo " +
+ Twine(Action.ValueForTypeID));
+ else if (Action.ValueForTypeID < 0)
+ Asm->OutStreamer.AddComment(" Filter TypeInfo " +
+ Twine(Action.ValueForTypeID));
+ else
+ Asm->OutStreamer.AddComment(" Cleanup");
+ }
+ Asm->EmitSLEB128(Action.ValueForTypeID);
+
+ // Action Record
+ //
+ // Self-relative signed displacement in bytes of the next action record,
+ // or 0 if there is no next action record.
+ if (VerboseAsm) {
+ if (Action.NextAction == 0) {
+ Asm->OutStreamer.AddComment(" No further actions");
+ } else {
+ unsigned NextAction = Entry + (Action.NextAction + 1) / 2;
+ Asm->OutStreamer.AddComment(" Continue to action "+Twine(NextAction));
+ }
+ }
+ Asm->EmitSLEB128(Action.NextAction);
+ }
+
+ emitTypeInfos(TTypeEncoding);
+
+ Asm->EmitAlignment(2);
+}
+
+void EHStreamer::emitTypeInfos(unsigned TTypeEncoding) {
+ const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
+ const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
+
+ bool VerboseAsm = Asm->OutStreamer.isVerboseAsm();
+
+ int Entry = 0;
+ // Emit the Catch TypeInfos.
+ if (VerboseAsm && !TypeInfos.empty()) {
+ Asm->OutStreamer.AddComment(">> Catch TypeInfos <<");
+ Asm->OutStreamer.AddBlankLine();
+ Entry = TypeInfos.size();
+ }
+
+ for (std::vector<const GlobalVariable *>::const_reverse_iterator
+ I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
+ const GlobalVariable *GV = *I;
+ if (VerboseAsm)
+ Asm->OutStreamer.AddComment("TypeInfo " + Twine(Entry--));
+ Asm->EmitTTypeReference(GV, TTypeEncoding);
+ }
+
+ // Emit the Exception Specifications.
+ if (VerboseAsm && !FilterIds.empty()) {
+ Asm->OutStreamer.AddComment(">> Filter TypeInfos <<");
+ Asm->OutStreamer.AddBlankLine();
+ Entry = 0;
+ }
+ for (std::vector<unsigned>::const_iterator
+ I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
+ unsigned TypeID = *I;
+ if (VerboseAsm) {
+ --Entry;
+ if (TypeID != 0)
+ Asm->OutStreamer.AddComment("FilterInfo " + Twine(Entry));
+ }
+
+ Asm->EmitULEB128(TypeID);
+ }
+}
+
+/// Emit all exception information that should come after the content.
+void EHStreamer::endModule() {
+ llvm_unreachable("Should be implemented");
+}
+
+/// Gather pre-function exception information. Assumes it's being emitted
+/// immediately after the function entry point.
+void EHStreamer::beginFunction(const MachineFunction *MF) {
+ llvm_unreachable("Should be implemented");
+}
+
+/// Gather and emit post-function exception information.
+void EHStreamer::endFunction(const MachineFunction *) {
+ llvm_unreachable("Should be implemented");
+}
--- /dev/null
+//===-- EHStreamer.h - Exception Handling Directive Streamer ---*- C++ -*--===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing exception info into assembly files.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_ASMPRINTER_EHSTREAMER_H
+#define LLVM_CODEGEN_ASMPRINTER_EHSTREAMER_H
+
+#include "AsmPrinterHandler.h"
+#include "llvm/ADT/DenseMap.h"
+
+namespace llvm {
+struct LandingPadInfo;
+class MachineModuleInfo;
+class MachineInstr;
+class MachineFunction;
+class AsmPrinter;
+
+template <typename T>
+class SmallVectorImpl;
+
+/// Emits exception handling directives.
+class EHStreamer : public AsmPrinterHandler {
+protected:
+ /// Target of directive emission.
+ AsmPrinter *Asm;
+
+ /// Collected machine module information.
+ MachineModuleInfo *MMI;
+
+ /// How many leading type ids two landing pads have in common.
+ static unsigned sharedTypeIDs(const LandingPadInfo *L,
+ const LandingPadInfo *R);
+
+ /// Structure holding a try-range and the associated landing pad.
+ struct PadRange {
+ // The index of the landing pad.
+ unsigned PadIndex;
+ // The index of the begin and end labels in the landing pad's label lists.
+ unsigned RangeIndex;
+ };
+
+ typedef DenseMap<MCSymbol *, PadRange> RangeMapType;
+
+ /// Structure describing an entry in the actions table.
+ struct ActionEntry {
+ int ValueForTypeID; // The value to write - may not be equal to the type id.
+ int NextAction;
+ unsigned Previous;
+ };
+
+ /// Structure describing an entry in the call-site table.
+ struct CallSiteEntry {
+ // The 'try-range' is BeginLabel .. EndLabel.
+ MCSymbol *BeginLabel; // zero indicates the start of the function.
+ MCSymbol *EndLabel; // zero indicates the end of the function.
+
+ // The landing pad starts at PadLabel.
+ MCSymbol *PadLabel; // zero indicates that there is no landing pad.
+ unsigned Action;
+ };
+
+ /// Compute the actions table and gather the first action index for each
+ /// landing pad site.
+ unsigned computeActionsTable(const SmallVectorImpl<const LandingPadInfo*>&LPs,
+ SmallVectorImpl<ActionEntry> &Actions,
+ SmallVectorImpl<unsigned> &FirstActions);
+
+ /// Return `true' if this is a call to a function marked `nounwind'. Return
+ /// `false' otherwise.
+ bool callToNoUnwindFunction(const MachineInstr *MI);
+
+ /// Compute the call-site table. The entry for an invoke has a try-range
+ /// containing the call, a non-zero landing pad and an appropriate action.
+ /// The entry for an ordinary call has a try-range containing the call and
+ /// zero for the landing pad and the action. Calls marked 'nounwind' have
+ /// no entry and must not be contained in the try-range of any entry - they
+ /// form gaps in the table. Entries must be ordered by try-range address.
+
+ void computeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
+ const RangeMapType &PadMap,
+ const SmallVectorImpl<const LandingPadInfo *> &LPs,
+ const SmallVectorImpl<unsigned> &FirstActions);
+
+ /// Emit landing pads and actions.
+ ///
+ /// The general organization of the table is complex, but the basic concepts
+ /// are easy. First there is a header which describes the location and
+ /// organization of the three components that follow.
+ /// 1. The landing pad site information describes the range of code covered
+ /// by the try. In our case it's an accumulation of the ranges covered
+ /// by the invokes in the try. There is also a reference to the landing
+ /// pad that handles the exception once processed. Finally an index into
+ /// the actions table.
+ /// 2. The action table, in our case, is composed of pairs of type ids
+ /// and next action offset. Starting with the action index from the
+ /// landing pad site, each type Id is checked for a match to the current
+ /// exception. If it matches then the exception and type id are passed
+ /// on to the landing pad. Otherwise the next action is looked up. This
+ /// chain is terminated with a next action of zero. If no type id is
+ /// found the frame is unwound and handling continues.
+ /// 3. Type id table contains references to all the C++ typeinfo for all
+ /// catches in the function. This tables is reversed indexed base 1.
+ void emitExceptionTable();
+
+ virtual void emitTypeInfos(unsigned TTypeEncoding);
+
+public:
+ EHStreamer(AsmPrinter *A);
+ virtual ~EHStreamer();
+
+ /// Emit all exception information that should come after the content.
+ void endModule() override;
+
+ /// Gather pre-function exception information. Assumes being emitted
+ /// immediately after the function entry point.
+ void beginFunction(const MachineFunction *MF) override;
+
+ /// Gather and emit post-function exception information.
+ void endFunction(const MachineFunction *) override;
+
+ // Unused.
+ void setSymbolSize(const MCSymbol *Sym, uint64_t Size) override {}
+ void beginInstruction(const MachineInstr *MI) override {}
+ void endInstruction() override {}
+};
+}
+
+#endif
+
using namespace llvm;
Win64Exception::Win64Exception(AsmPrinter *A)
- : DwarfException(A),
- shouldEmitPersonality(false), shouldEmitLSDA(false), shouldEmitMoves(false)
- {}
+ : EHStreamer(A), shouldEmitPersonality(false), shouldEmitLSDA(false),
+ shouldEmitMoves(false) {}
Win64Exception::~Win64Exception() {}
Asm->OutStreamer.EmitWin64EHHandlerData();
Asm->OutStreamer.EmitValue(MCSymbolRefExpr::Create(Sym, Asm->OutContext),
4);
- EmitExceptionTable();
+ emitExceptionTable();
Asm->OutStreamer.PopSection();
}
Asm->OutStreamer.EmitWin64EHEndProc();
projects / oota-llvm.git / commitdiff