//===----------------------------------------------------------------------===//
#include "DwarfException.h"
-#include "llvm/Module.h"
-#include "llvm/CodeGen/MachineModuleInfo.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/MachineLocation.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/Target/Mangler.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Target/TargetFrameInfo.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/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Support/Dwarf.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/Timer.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/ADT/Twine.h"
using namespace llvm;
DwarfException::DwarfException(AsmPrinter *A)
- : DwarfPrinter(A), shouldEmitTable(false), shouldEmitMoves(false),
- shouldEmitTableModule(false), shouldEmitMovesModule(false),
- ExceptionTimer(0) {
- if (TimePassesIsEnabled)
- ExceptionTimer = new Timer("DWARF Exception Writer");
-}
-
-DwarfException::~DwarfException() {
- delete ExceptionTimer;
-}
-
-/// EmitCIE - Emit a Common Information Entry (CIE). This holds information that
-/// is shared among many Frame Description Entries. There is at least one CIE
-/// in every non-empty .debug_frame section.
-void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
- // Size and sign of stack growth.
- int stackGrowth =
- Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
- TargetFrameInfo::StackGrowsUp ?
- TD->getPointerSize() : -TD->getPointerSize();
-
- const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
-
- // Begin eh frame section.
- Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
-
- MCSymbol *EHFrameSym;
- if (TLOF.isFunctionEHFrameSymbolPrivate())
- EHFrameSym = Asm->GetTempSymbol("EH_frame", Index);
- else
- EHFrameSym = Asm->OutContext.GetOrCreateSymbol(Twine("EH_frame") +
- Twine(Index));
- Asm->OutStreamer.EmitLabel(EHFrameSym);
-
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_eh_frame", Index));
-
- // Define base labels.
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_frame_common", Index));
-
- // Define the eh frame length.
- Asm->OutStreamer.AddComment("Length of Common Information Entry");
- Asm->EmitLabelDifference(Asm->GetTempSymbol("eh_frame_common_end", Index),
- Asm->GetTempSymbol("eh_frame_common_begin", Index),
- 4);
-
- // EH frame header.
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_frame_common_begin",Index));
- Asm->OutStreamer.AddComment("CIE Identifier Tag");
- Asm->OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
- Asm->OutStreamer.AddComment("DW_CIE_VERSION");
- Asm->OutStreamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1/*size*/, 0/*addr*/);
-
- // The personality presence indicates that language specific information will
- // show up in the eh frame. Find out how we are supposed to lower the
- // personality function reference:
-
- unsigned LSDAEncoding = TLOF.getLSDAEncoding();
- unsigned FDEEncoding = TLOF.getFDEEncoding();
- unsigned PerEncoding = TLOF.getPersonalityEncoding();
-
- char Augmentation[6] = { 0 };
- unsigned AugmentationSize = 0;
- char *APtr = Augmentation + 1;
-
- if (PersonalityFn) {
- // There is a personality function.
- *APtr++ = 'P';
- AugmentationSize += 1 + Asm->GetSizeOfEncodedValue(PerEncoding);
- }
-
- if (UsesLSDA[Index]) {
- // An LSDA pointer is in the FDE augmentation.
- *APtr++ = 'L';
- ++AugmentationSize;
- }
-
- if (FDEEncoding != dwarf::DW_EH_PE_absptr) {
- // A non-default pointer encoding for the FDE.
- *APtr++ = 'R';
- ++AugmentationSize;
- }
-
- if (APtr != Augmentation + 1)
- Augmentation[0] = 'z';
+ : Asm(A), MMI(Asm->MMI) {}
- Asm->OutStreamer.AddComment("CIE Augmentation");
- Asm->OutStreamer.EmitBytes(StringRef(Augmentation, strlen(Augmentation)+1),0);
-
- // Round out reader.
- Asm->EmitULEB128(1, "CIE Code Alignment Factor");
- Asm->EmitSLEB128(stackGrowth, "CIE Data Alignment Factor");
- Asm->OutStreamer.AddComment("CIE Return Address Column");
- Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true));
-
- if (Augmentation[0]) {
- Asm->EmitULEB128(AugmentationSize, "Augmentation Size");
-
- // If there is a personality, we need to indicate the function's location.
- if (PersonalityFn) {
- Asm->EmitEncodingByte(PerEncoding, "Personality");
- Asm->OutStreamer.AddComment("Personality");
- Asm->EmitReference(PersonalityFn, PerEncoding);
- }
- if (UsesLSDA[Index])
- Asm->EmitEncodingByte(LSDAEncoding, "LSDA");
- if (FDEEncoding != dwarf::DW_EH_PE_absptr)
- Asm->EmitEncodingByte(FDEEncoding, "FDE");
- }
-
- // Indicate locations of general callee saved registers in frame.
- std::vector<MachineMove> Moves;
- RI->getInitialFrameState(Moves);
- Asm->EmitFrameMoves(Moves, 0, true);
-
- // On Darwin the linker honors the alignment of eh_frame, which means it must
- // be 8-byte on 64-bit targets to match what gcc does. Otherwise you get
- // holes which confuse readers of eh_frame.
- Asm->EmitAlignment(TD->getPointerSize() == 4 ? 2 : 3, 0, 0, false);
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_frame_common_end", Index));
-}
-
-/// EmitFDE - Emit the Frame Description Entry (FDE) for the function.
-void DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) {
- assert(!EHFrameInfo.function->hasAvailableExternallyLinkage() &&
- "Should not emit 'available externally' functions at all");
-
- const Function *TheFunc = EHFrameInfo.function;
- const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
-
- unsigned LSDAEncoding = TLOF.getLSDAEncoding();
- unsigned FDEEncoding = TLOF.getFDEEncoding();
-
- Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
-
- // Externally visible entry into the functions eh frame info. If the
- // corresponding function is static, this should not be externally visible.
- if (!TheFunc->hasLocalLinkage() && TLOF.isFunctionEHSymbolGlobal())
- Asm->OutStreamer.EmitSymbolAttribute(EHFrameInfo.FunctionEHSym,MCSA_Global);
-
- // If corresponding function is weak definition, this should be too.
- if (TheFunc->isWeakForLinker() && MAI->getWeakDefDirective())
- Asm->OutStreamer.EmitSymbolAttribute(EHFrameInfo.FunctionEHSym,
- MCSA_WeakDefinition);
-
- // If corresponding function is hidden, this should be too.
- if (TheFunc->hasHiddenVisibility())
- if (MCSymbolAttr HiddenAttr = MAI->getHiddenVisibilityAttr())
- Asm->OutStreamer.EmitSymbolAttribute(EHFrameInfo.FunctionEHSym,
- HiddenAttr);
-
- // If there are no calls then you can't unwind. This may mean we can omit the
- // EH Frame, but some environments do not handle weak absolute symbols. If
- // UnwindTablesMandatory is set we cannot do this optimization; the unwind
- // info is to be available for non-EH uses.
- if (!EHFrameInfo.hasCalls && !UnwindTablesMandatory &&
- (!TheFunc->isWeakForLinker() ||
- !MAI->getWeakDefDirective() ||
- TLOF.getSupportsWeakOmittedEHFrame())) {
- Asm->OutStreamer.EmitAssignment(EHFrameInfo.FunctionEHSym,
- MCConstantExpr::Create(0, Asm->OutContext));
- // This name has no connection to the function, so it might get
- // dead-stripped when the function is not, erroneously. Prohibit
- // dead-stripping unconditionally.
- if (MAI->hasNoDeadStrip())
- Asm->OutStreamer.EmitSymbolAttribute(EHFrameInfo.FunctionEHSym,
- MCSA_NoDeadStrip);
- } else {
- Asm->OutStreamer.EmitLabel(EHFrameInfo.FunctionEHSym);
-
- // EH frame header.
- Asm->OutStreamer.AddComment("Length of Frame Information Entry");
- Asm->EmitLabelDifference(
- Asm->GetTempSymbol("eh_frame_end", EHFrameInfo.Number),
- Asm->GetTempSymbol("eh_frame_begin", EHFrameInfo.Number), 4);
-
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_frame_begin",
- EHFrameInfo.Number));
-
- Asm->OutStreamer.AddComment("FDE CIE offset");
- Asm->EmitLabelDifference(
- Asm->GetTempSymbol("eh_frame_begin", EHFrameInfo.Number),
- Asm->GetTempSymbol("eh_frame_common",
- EHFrameInfo.PersonalityIndex), 4);
-
- MCSymbol *EHFuncBeginSym =
- Asm->GetTempSymbol("eh_func_begin", EHFrameInfo.Number);
-
- Asm->OutStreamer.AddComment("FDE initial location");
- Asm->EmitReference(EHFuncBeginSym, FDEEncoding);
-
- Asm->OutStreamer.AddComment("FDE address range");
- Asm->EmitLabelDifference(Asm->GetTempSymbol("eh_func_end",
- EHFrameInfo.Number),
- EHFuncBeginSym,
- Asm->GetSizeOfEncodedValue(FDEEncoding));
-
- // If there is a personality and landing pads then point to the language
- // specific data area in the exception table.
- if (MMI->getPersonalities()[0] != NULL) {
- unsigned Size = Asm->GetSizeOfEncodedValue(LSDAEncoding);
-
- Asm->EmitULEB128(Size, "Augmentation size");
- Asm->OutStreamer.AddComment("Language Specific Data Area");
- if (EHFrameInfo.hasLandingPads)
- Asm->EmitReference(Asm->GetTempSymbol("exception", EHFrameInfo.Number),
- LSDAEncoding);
- else
- Asm->OutStreamer.EmitIntValue(0, Size/*size*/, 0/*addrspace*/);
-
- } else {
- Asm->EmitULEB128(0, "Augmentation size");
- }
-
- // Indicate locations of function specific callee saved registers in frame.
- Asm->EmitFrameMoves(EHFrameInfo.Moves, EHFuncBeginSym, true);
-
- // On Darwin the linker honors the alignment of eh_frame, which means it
- // must be 8-byte on 64-bit targets to match what gcc does. Otherwise you
- // get holes which confuse readers of eh_frame.
- Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
- 0, 0, false);
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_frame_end",
- EHFrameInfo.Number));
-
- // If the function is marked used, this table should be also. We cannot
- // make the mark unconditional in this case, since retaining the table also
- // retains the function in this case, and there is code around that depends
- // on unused functions (calling undefined externals) being dead-stripped to
- // link correctly. Yes, there really is.
- if (MMI->isUsedFunction(EHFrameInfo.function))
- if (MAI->hasNoDeadStrip())
- Asm->OutStreamer.EmitSymbolAttribute(EHFrameInfo.FunctionEHSym,
- MCSA_NoDeadStrip);
- }
- Asm->OutStreamer.AddBlankLine();
-}
+DwarfException::~DwarfException() {}
/// SharedTypeIds - How many leading type ids two landing pads have in common.
unsigned DwarfException::SharedTypeIds(const LandingPadInfo *L,
for (std::vector<unsigned>::const_iterator
I = FilterIds.begin(), E = FilterIds.end(); I != E; ++I) {
FilterOffsets.push_back(Offset);
- Offset -= MCAsmInfo::getULEB128Size(*I);
+ Offset -= getULEB128Size(*I);
}
FirstActions.reserve(LandingPads.size());
unsigned SizePrevIds = PrevLPI->TypeIds.size();
assert(Actions.size());
PrevAction = Actions.size() - 1;
- SizeAction =
- MCAsmInfo::getSLEB128Size(Actions[PrevAction].NextAction) +
- MCAsmInfo::getSLEB128Size(Actions[PrevAction].ValueForTypeID);
+ SizeAction = getSLEB128Size(Actions[PrevAction].NextAction) +
+ getSLEB128Size(Actions[PrevAction].ValueForTypeID);
for (unsigned j = NumShared; j != SizePrevIds; ++j) {
assert(PrevAction != (unsigned)-1 && "PrevAction is invalid!");
- SizeAction -=
- MCAsmInfo::getSLEB128Size(Actions[PrevAction].ValueForTypeID);
+ SizeAction -= getSLEB128Size(Actions[PrevAction].ValueForTypeID);
SizeAction += -Actions[PrevAction].NextAction;
PrevAction = Actions[PrevAction].Previous;
}
int TypeID = TypeIds[J];
assert(-1 - TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
- unsigned SizeTypeID = MCAsmInfo::getSLEB128Size(ValueForTypeID);
+ unsigned SizeTypeID = getSLEB128Size(ValueForTypeID);
int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
- SizeAction = SizeTypeID + MCAsmInfo::getSLEB128Size(NextAction);
+ SizeAction = SizeTypeID + getSLEB128Size(NextAction);
SizeSiteActions += SizeAction;
ActionEntry Action = { ValueForTypeID, NextAction, PrevAction };
/// CallToNoUnwindFunction - Return `true' if this is a call to a function
/// marked `nounwind'. Return `false' otherwise.
bool DwarfException::CallToNoUnwindFunction(const MachineInstr *MI) {
- assert(MI->getDesc().isCall() && "This should be a call instruction!");
+ assert(MI->isCall() && "This should be a call instruction!");
bool MarkedNoUnwind = false;
bool SawFunc = false;
const MachineOperand &MO = MI->getOperand(I);
if (!MO.isGlobal()) continue;
-
- Function *F = dyn_cast<Function>(MO.getGlobal());
+
+ const Function *F = dyn_cast<Function>(MO.getGlobal());
if (F == 0) 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;
bool PreviousIsInvoke = false;
// Visit all instructions in order of address.
- for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
+ for (MachineFunction::const_iterator I = Asm->MF->begin(), E = Asm->MF->end();
I != E; ++I) {
for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
MI != E; ++MI) {
if (!MI->isLabel()) {
- if (MI->getDesc().isCall())
+ if (MI->isCall())
SawPotentiallyThrowing |= !CallToNoUnwindFunction(MI);
continue;
}
// 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 &&
- MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) {
+ if (SawPotentiallyThrowing && Asm->MAI->isExceptionHandlingDwarf()) {
CallSiteEntry Site = { LastLabel, BeginLabel, 0, 0 };
CallSites.push_back(Site);
PreviousIsInvoke = false;
};
// Try to merge with the previous call-site. SJLJ doesn't do this
- if (PreviousIsInvoke &&
- MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) {
+ 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.
}
// Otherwise, create a new call-site.
- if (MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf)
+ if (Asm->MAI->isExceptionHandlingDwarf())
CallSites.push_back(Site);
else {
// SjLj EH must maintain the call sites in the order assigned
// 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 &&
- MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf) {
+ if (SawPotentiallyThrowing && Asm->MAI->isExceptionHandlingDwarf()) {
CallSiteEntry Site = { LastLabel, 0, 0, 0 };
CallSites.push_back(Site);
}
/// 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<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
+ const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
// Final tallies.
// Call sites.
- bool IsSJLJ = MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
+ bool IsSJLJ = Asm->MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
bool HaveTTData = IsSJLJ ? (!TypeInfos.empty() || !FilterIds.empty()) : true;
-
+
unsigned CallSiteTableLength;
if (IsSJLJ)
CallSiteTableLength = 0;
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 =
+ CallSiteTableLength =
CallSites.size() * (SiteStartSize + SiteLengthSize + LandingPadSize);
}
for (unsigned i = 0, e = CallSites.size(); i < e; ++i) {
- CallSiteTableLength += MCAsmInfo::getULEB128Size(CallSites[i].Action);
+ CallSiteTableLength += getULEB128Size(CallSites[i].Action);
if (IsSJLJ)
- CallSiteTableLength += MCAsmInfo::getULEB128Size(i);
+ CallSiteTableLength += getULEB128Size(i);
}
// Type infos.
// 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;
- TypeFormatSize = TD->getPointerSize(); // dwarf::DW_EH_PE_absptr
+ // 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
// 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
}
// Begin the exception table.
- Asm->OutStreamer.SwitchSection(LSDASection);
- Asm->EmitAlignment(2, 0, 0, false);
+ // 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 =
+ MCSymbol *GCCETSym =
Asm->OutContext.GetOrCreateSymbol(Twine("GCC_except_table")+
- Twine(SubprogramCount));
+ Twine(Asm->getFunctionNumber()));
Asm->OutStreamer.EmitLabel(GCCETSym);
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("exception", SubprogramCount));
+ Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("exception",
+ Asm->getFunctionNumber()));
if (IsSJLJ)
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("_LSDA_",
// 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 =
- MCAsmInfo::getULEB128Size(CallSiteTableLength);
+ 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 = MCAsmInfo::getULEB128Size(TTypeBaseOffset);
+ unsigned TTypeBaseOffsetSize = getULEB128Size(TTypeBaseOffset);
unsigned TotalSize =
sizeof(int8_t) + // LPStart format
sizeof(int8_t) + // TType format
SizeAlign = 0;
}
+ bool VerboseAsm = Asm->OutStreamer.isVerboseAsm();
+
// SjLj Exception handling
if (IsSJLJ) {
Asm->EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
// Offset of the landing pad, counted in 16-byte bundles relative to the
// @LPStart address.
- Asm->EmitULEB128(idx, "Landing pad");
+ 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.
- Asm->EmitULEB128(S.Action, "Action");
+ 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(MAI->getExceptionHandlingType() == ExceptionHandling::Dwarf);
+ 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
// 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", SubprogramCount);
-
+ Asm->GetTempSymbol("eh_func_begin", Asm->getFunctionNumber());
+
MCSymbol *BeginLabel = S.BeginLabel;
if (BeginLabel == 0)
BeginLabel = EHFuncBeginSym;
MCSymbol *EndLabel = S.EndLabel;
if (EndLabel == 0)
- EndLabel = Asm->GetTempSymbol("eh_func_end", SubprogramCount);
-
+ 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.
- Asm->OutStreamer.AddComment("Region start");
+ if (VerboseAsm)
+ Asm->OutStreamer.AddComment(">> Call Site " + Twine(++Entry) + " <<");
Asm->EmitLabelDifference(BeginLabel, EHFuncBeginSym, 4);
-
- Asm->OutStreamer.AddComment("Region length");
+ 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.
- Asm->OutStreamer.AddComment("Landing pad");
- if (!S.PadLabel)
- Asm->OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
- else
+ 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.
- Asm->EmitULEB128(S.Action, "Action");
+ 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.
- if (Actions.size() != 0) {
- Asm->OutStreamer.AddComment("-- Action Record Table --");
- Asm->OutStreamer.AddBlankLine();
- }
-
+ int Entry = 0;
for (SmallVectorImpl<ActionEntry>::const_iterator
I = Actions.begin(), E = Actions.end(); I != E; ++I) {
const ActionEntry &Action = *I;
- Asm->OutStreamer.AddComment("Action Record");
- Asm->OutStreamer.AddBlankLine();
+
+ 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.
- Asm->EmitSLEB128(Action.ValueForTypeID, " TypeInfo index");
+ 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.
- Asm->EmitSLEB128(Action.NextAction, " Next action");
+ 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 (!TypeInfos.empty()) {
- Asm->OutStreamer.AddComment("-- Catch TypeInfos --");
+ if (VerboseAsm && !TypeInfos.empty()) {
+ Asm->OutStreamer.AddComment(">> Catch TypeInfos <<");
Asm->OutStreamer.AddBlankLine();
+ Entry = TypeInfos.size();
}
- for (std::vector<GlobalVariable *>::const_reverse_iterator
+
+ for (std::vector<const GlobalVariable *>::const_reverse_iterator
I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
const GlobalVariable *GV = *I;
-
- Asm->OutStreamer.AddComment("TypeInfo");
- if (GV)
- Asm->EmitReference(GV, TTypeEncoding);
- else
- Asm->OutStreamer.EmitIntValue(0,Asm->GetSizeOfEncodedValue(TTypeEncoding),
- 0);
+ if (VerboseAsm)
+ Asm->OutStreamer.AddComment("TypeInfo " + Twine(Entry--));
+ Asm->EmitTTypeReference(GV, TTypeEncoding);
}
// Emit the Exception Specifications.
- if (!FilterIds.empty()) {
- Asm->OutStreamer.AddComment("-- Filter IDs --");
+ 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;
- Asm->EmitULEB128(TypeID, TypeID != 0 ? "Exception specification" : 0);
- }
+ if (VerboseAsm) {
+ --Entry;
+ if (TypeID != 0)
+ Asm->OutStreamer.AddComment("FilterInfo " + Twine(Entry));
+ }
- Asm->EmitAlignment(2, 0, 0, false);
+ Asm->EmitULEB128(TypeID);
+ }
}
-/// EndModule - Emit all exception information that should come after the
+/// endModule - Emit all exception information that should come after the
/// content.
-void DwarfException::EndModule() {
- if (MAI->getExceptionHandlingType() != ExceptionHandling::Dwarf)
- return;
-
- if (!shouldEmitMovesModule && !shouldEmitTableModule)
- return;
-
- TimeRegion Timer(ExceptionTimer);
-
- const std::vector<Function *> Personalities = MMI->getPersonalities();
-
- for (unsigned I = 0, E = Personalities.size(); I < E; ++I)
- EmitCIE(Personalities[I], I);
-
- for (std::vector<FunctionEHFrameInfo>::iterator
- I = EHFrames.begin(), E = EHFrames.end(); I != E; ++I)
- EmitFDE(*I);
+void DwarfException::endModule() {
+ llvm_unreachable("Should be implemented");
}
-/// BeginFunction - Gather pre-function exception information. Assumes it's
+/// beginFunction - Gather pre-function exception information. Assumes it's
/// being emitted immediately after the function entry point.
-void DwarfException::BeginFunction(const MachineFunction *MF) {
- if (!MMI || !MAI->doesSupportExceptionHandling()) return;
-
- TimeRegion Timer(ExceptionTimer);
- this->MF = MF;
- shouldEmitTable = shouldEmitMoves = false;
-
- // If any landing pads survive, we need an EH table.
- shouldEmitTable = !MMI->getLandingPads().empty();
-
- // See if we need frame move info.
- shouldEmitMoves = !MF->getFunction()->doesNotThrow() || UnwindTablesMandatory;
-
- if (shouldEmitMoves || shouldEmitTable)
- // Assumes in correct section after the entry point.
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_begin",
- ++SubprogramCount));
-
- shouldEmitTableModule |= shouldEmitTable;
- shouldEmitMovesModule |= shouldEmitMoves;
+void DwarfException::beginFunction(const MachineFunction *MF) {
+ llvm_unreachable("Should be implemented");
}
-/// EndFunction - Gather and emit post-function exception information.
-///
-void DwarfException::EndFunction() {
- if (!shouldEmitMoves && !shouldEmitTable) return;
-
- TimeRegion Timer(ExceptionTimer);
- Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",SubprogramCount));
-
- // Record if this personality index uses a landing pad.
- bool HasLandingPad = !MMI->getLandingPads().empty();
- UsesLSDA[MMI->getPersonalityIndex()] |= HasLandingPad;
-
- // Map all labels and get rid of any dead landing pads.
- MMI->TidyLandingPads();
-
- if (HasLandingPad)
- EmitExceptionTable();
-
- const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
- MCSymbol *FunctionEHSym =
- Asm->GetSymbolWithGlobalValueBase(MF->getFunction(), ".eh",
- TLOF.isFunctionEHFrameSymbolPrivate());
-
- // Save EH frame information
- EHFrames.push_back(FunctionEHFrameInfo(FunctionEHSym, SubprogramCount,
- MMI->getPersonalityIndex(),
- MF->getFrameInfo()->hasCalls(),
- !MMI->getLandingPads().empty(),
- MMI->getFrameMoves(),
- MF->getFunction()));
+/// endFunction - Gather and emit post-function exception information.
+void DwarfException::endFunction(const MachineFunction *) {
+ llvm_unreachable("Should be implemented");
}
projects / oota-llvm.git / blobdiff