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path: root/lib/CodeGen/AsmPrinter/DwarfException.cpp
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Diffstat (limited to 'lib/CodeGen/AsmPrinter/DwarfException.cpp')
-rw-r--r--lib/CodeGen/AsmPrinter/DwarfException.cpp232
1 files changed, 98 insertions, 134 deletions
diff --git a/lib/CodeGen/AsmPrinter/DwarfException.cpp b/lib/CodeGen/AsmPrinter/DwarfException.cpp
index b6801dc..2b08ba4 100644
--- a/lib/CodeGen/AsmPrinter/DwarfException.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfException.cpp
@@ -50,26 +50,6 @@ DwarfException::~DwarfException() {
delete ExceptionTimer;
}
-/// SizeOfEncodedValue - Return the size of the encoding in bytes.
-unsigned DwarfException::SizeOfEncodedValue(unsigned Encoding) {
- if (Encoding == dwarf::DW_EH_PE_omit)
- return 0;
-
- switch (Encoding & 0x07) {
- case dwarf::DW_EH_PE_absptr:
- return TD->getPointerSize();
- case dwarf::DW_EH_PE_udata2:
- return 2;
- case dwarf::DW_EH_PE_udata4:
- return 4;
- case dwarf::DW_EH_PE_udata8:
- return 8;
- }
-
- assert(0 && "Invalid encoded value.");
- return 0;
-}
-
/// CreateLabelDiff - Emit a label and subtract it from the expression we
/// already have. This is equivalent to emitting "foo - .", but we have to emit
/// the label for "." directly.
@@ -100,7 +80,7 @@ void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
TD->getPointerSize() : -TD->getPointerSize();
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
-
+
// Begin eh frame section.
Asm->OutStreamer.SwitchSection(TLOF.getEHFrameSection());
@@ -128,30 +108,16 @@ void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
// 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:
- const MCExpr *PersonalityRef = 0;
- bool IsPersonalityIndirect = false, IsPersonalityPCRel = false;
- if (PersonalityFn) {
- // FIXME: HANDLE STATIC CODEGEN MODEL HERE.
-
- // In non-static mode, ask the object file how to represent this reference.
- PersonalityRef =
- TLOF.getSymbolForDwarfGlobalReference(PersonalityFn, Asm->Mang,
- Asm->MMI,
- IsPersonalityIndirect,
- IsPersonalityPCRel);
- }
-
- unsigned PerEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
- if (IsPersonalityIndirect)
- PerEncoding |= dwarf::DW_EH_PE_indirect;
- unsigned LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
- unsigned FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
+
+ unsigned LSDAEncoding = TLOF.getLSDAEncoding();
+ unsigned FDEEncoding = TLOF.getFDEEncoding();
+ unsigned PerEncoding = TLOF.getPersonalityEncoding();
char Augmentation[6] = { 0 };
unsigned AugmentationSize = 0;
char *APtr = Augmentation + 1;
- if (PersonalityRef) {
+ if (PersonalityFn) {
// There is a personality function.
*APtr++ = 'P';
AugmentationSize += 1 + SizeOfEncodedValue(PerEncoding);
@@ -181,20 +147,19 @@ void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true));
EOL("CIE Return Address Column");
- EmitULEB128(AugmentationSize, "Augmentation Size");
- EmitEncodingByte(PerEncoding, "Personality");
-
- // If there is a personality, we need to indicate the function's location.
- if (PersonalityRef) {
- if (!IsPersonalityPCRel)
- PersonalityRef = CreateLabelDiff(PersonalityRef, "personalityref_addr",
- Index);
+ if (Augmentation[0]) {
+ EmitULEB128(AugmentationSize, "Augmentation Size");
- O << MAI->getData32bitsDirective() << *PersonalityRef;
- EOL("Personality");
-
- EmitEncodingByte(LSDAEncoding, "LSDA");
- EmitEncodingByte(FDEEncoding, "FDE");
+ // If there is a personality, we need to indicate the function's location.
+ if (PersonalityFn) {
+ EmitEncodingByte(PerEncoding, "Personality");
+ EmitReference(PersonalityFn, PerEncoding);
+ EOL("Personality");
+ }
+ if (UsesLSDA[Index])
+ EmitEncodingByte(LSDAEncoding, "LSDA");
+ if (FDEEncoding != dwarf::DW_EH_PE_absptr)
+ EmitEncodingByte(FDEEncoding, "FDE");
}
// Indicate locations of general callee saved registers in frame.
@@ -216,8 +181,12 @@ void DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) {
"Should not emit 'available externally' functions at all");
const Function *TheFunc = EHFrameInfo.function;
+ const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
- Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getEHFrameSection());
+ 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.
@@ -255,7 +224,8 @@ void DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) {
// EH frame header.
EmitDifference("eh_frame_end", EHFrameInfo.Number,
- "eh_frame_begin", EHFrameInfo.Number, true);
+ "eh_frame_begin", EHFrameInfo.Number,
+ true);
EOL("Length of Frame Information Entry");
EmitLabel("eh_frame_begin", EHFrameInfo.Number);
@@ -266,33 +236,23 @@ void DwarfException::EmitFDE(const FunctionEHFrameInfo &EHFrameInfo) {
EOL("FDE CIE offset");
- EmitReference("eh_func_begin", EHFrameInfo.Number, true, true);
+ EmitReference("eh_func_begin", EHFrameInfo.Number, FDEEncoding);
EOL("FDE initial location");
EmitDifference("eh_func_end", EHFrameInfo.Number,
- "eh_func_begin", EHFrameInfo.Number, true);
+ "eh_func_begin", EHFrameInfo.Number,
+ SizeOfEncodedValue(FDEEncoding) == 4);
EOL("FDE address range");
// 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 = SizeOfEncodedValue(LSDAEncoding);
- if (Asm->TM.getLSDAEncoding() != DwarfLSDAEncoding::EightByte) {
- EmitULEB128(4, "Augmentation size");
-
- if (EHFrameInfo.hasLandingPads)
- EmitReference("exception", EHFrameInfo.Number, true, true);
- else
- Asm->OutStreamer.EmitIntValue(0, 4/*size*/, 0/*addrspace*/);
- } else {
- EmitULEB128(TD->getPointerSize(), "Augmentation size");
-
- if (EHFrameInfo.hasLandingPads) {
- EmitReference("exception", EHFrameInfo.Number, true, false);
- } else {
- Asm->OutStreamer.EmitIntValue(0, TD->getPointerSize(),
- 0/*addrspace*/);
- }
- }
+ EmitULEB128(Size, "Augmentation size");
+ if (EHFrameInfo.hasLandingPads)
+ EmitReference("exception", EHFrameInfo.Number, LSDAEncoding);
+ else
+ Asm->OutStreamer.EmitIntValue(0, Size/*size*/, 0/*addrspace*/);
EOL("Language Specific Data Area");
} else {
@@ -407,20 +367,22 @@ ComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*> &LandingPads,
if (NumShared < TypeIds.size()) {
unsigned SizeAction = 0;
- ActionEntry *PrevAction = 0;
+ unsigned PrevAction = (unsigned)-1;
if (NumShared) {
const unsigned SizePrevIds = PrevLPI->TypeIds.size();
assert(Actions.size());
- PrevAction = &Actions.back();
- SizeAction = MCAsmInfo::getSLEB128Size(PrevAction->NextAction) +
- MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
+ PrevAction = Actions.size() - 1;
+ SizeAction =
+ MCAsmInfo::getSLEB128Size(Actions[PrevAction].NextAction) +
+ MCAsmInfo::getSLEB128Size(Actions[PrevAction].ValueForTypeID);
for (unsigned j = NumShared; j != SizePrevIds; ++j) {
+ assert(PrevAction != (unsigned)-1 && "PrevAction is invalid!");
SizeAction -=
- MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
- SizeAction += -PrevAction->NextAction;
- PrevAction = PrevAction->Previous;
+ MCAsmInfo::getSLEB128Size(Actions[PrevAction].ValueForTypeID);
+ SizeAction += -Actions[PrevAction].NextAction;
+ PrevAction = Actions[PrevAction].Previous;
}
}
@@ -437,7 +399,7 @@ ComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*> &LandingPads,
ActionEntry Action = { ValueForTypeID, NextAction, PrevAction };
Actions.push_back(Action);
- PrevAction = &Actions.back();
+ PrevAction = Actions.size() - 1;
}
// Record the first action of the landing pad site.
@@ -447,7 +409,7 @@ ComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*> &LandingPads,
// 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 in dicating the start of the actions table), and 0
+ // biased by 1 (1 indicating the start of the actions table), and 0
// indicates that there are no actions.
FirstActions.push_back(FirstAction);
@@ -648,8 +610,7 @@ void DwarfException::EmitExceptionTable() {
// landing pad site.
SmallVector<ActionEntry, 32> Actions;
SmallVector<unsigned, 64> FirstActions;
- unsigned SizeActions = ComputeActionsTable(LandingPads, Actions,
- 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
@@ -677,29 +638,29 @@ void DwarfException::EmitExceptionTable() {
const unsigned LandingPadSize = SizeOfEncodedValue(dwarf::DW_EH_PE_udata4);
bool IsSJLJ = MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
bool HaveTTData = IsSJLJ ? (!TypeInfos.empty() || !FilterIds.empty()) : true;
- unsigned SizeSites;
+ unsigned CallSiteTableLength;
if (IsSJLJ)
- SizeSites = 0;
+ CallSiteTableLength = 0;
else
- SizeSites = CallSites.size() *
+ CallSiteTableLength = CallSites.size() *
(SiteStartSize + SiteLengthSize + LandingPadSize);
for (unsigned i = 0, e = CallSites.size(); i < e; ++i) {
- SizeSites += MCAsmInfo::getULEB128Size(CallSites[i].Action);
+ CallSiteTableLength += MCAsmInfo::getULEB128Size(CallSites[i].Action);
if (IsSJLJ)
- SizeSites += MCAsmInfo::getULEB128Size(i);
+ CallSiteTableLength += MCAsmInfo::getULEB128Size(i);
}
// Type infos.
const MCSection *LSDASection = Asm->getObjFileLowering().getLSDASection();
- unsigned TTypeFormat;
+ 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.
- TTypeFormat = dwarf::DW_EH_PE_omit;
+ TTypeEncoding = dwarf::DW_EH_PE_omit;
TypeFormatSize = SizeOfEncodedValue(dwarf::DW_EH_PE_absptr);
} else {
// Okay, we have actual filters or typeinfos to emit. As such, we need to
@@ -729,21 +690,28 @@ void DwarfException::EmitExceptionTable() {
// somewhere. This predicate should be moved to a shared location that is
// in target-independent code.
//
- if (LSDASection->getKind().isWriteable() ||
- Asm->TM.getRelocationModel() == Reloc::Static)
- TTypeFormat = dwarf::DW_EH_PE_absptr;
- else
- TTypeFormat = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
- dwarf::DW_EH_PE_sdata4;
-
- TypeFormatSize = SizeOfEncodedValue(TTypeFormat);
+ TTypeEncoding = Asm->getObjFileLowering().getTTypeEncoding();
+ TypeFormatSize = SizeOfEncodedValue(TTypeEncoding);
}
// Begin the exception table.
Asm->OutStreamer.SwitchSection(LSDASection);
Asm->EmitAlignment(2, 0, 0, false);
+ // Emit the LSDA.
O << "GCC_except_table" << SubprogramCount << ":\n";
+ EmitLabel("exception", SubprogramCount);
+
+ if (IsSJLJ) {
+ SmallString<16> LSDAName;
+ raw_svector_ostream(LSDAName) << MAI->getPrivateGlobalPrefix() <<
+ "_LSDA_" << Asm->getFunctionNumber();
+ O << LSDAName.str() << ":\n";
+ }
+
+ // Emit the LSDA header.
+ EmitEncodingByte(dwarf::DW_EH_PE_omit, "@LPStart");
+ 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
@@ -752,7 +720,7 @@ void DwarfException::EmitExceptionTable() {
// 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
+ // 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
@@ -761,41 +729,35 @@ void DwarfException::EmitExceptionTable() {
// 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 TyOffset = sizeof(int8_t) + // Call site format
- MCAsmInfo::getULEB128Size(SizeSites) + // Call site table length
- SizeSites + SizeActions + SizeTypes;
- unsigned TotalSize = sizeof(int8_t) + // LPStart format
- sizeof(int8_t) + // TType format
- (HaveTTData ?
- MCAsmInfo::getULEB128Size(TyOffset) : 0) + // TType base offset
- TyOffset;
+ unsigned CallSiteTableLengthSize =
+ MCAsmInfo::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 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;
- for (unsigned i = 0; i != SizeAlign; ++i) {
- Asm->EmitInt8(0);
- EOL("Padding");
- }
-
- EmitLabel("exception", SubprogramCount);
-
- if (IsSJLJ) {
- SmallString<16> LSDAName;
- raw_svector_ostream(LSDAName) << MAI->getPrivateGlobalPrefix() <<
- "_LSDA_" << Asm->getFunctionNumber();
- O << LSDAName.str() << ":\n";
+ if (HaveTTData) {
+ // Account for any extra padding that will be added to the call site table
+ // length.
+ EmitULEB128(TTypeBaseOffset, "@TType base offset", SizeAlign);
+ SizeAlign = 0;
}
- // Emit the header.
- EmitEncodingByte(dwarf::DW_EH_PE_omit, "@LPStart");
- EmitEncodingByte(TTypeFormat, "@TType");
-
- if (HaveTTData)
- EmitULEB128(TyOffset, "@TType base offset");
-
// SjLj Exception handling
if (IsSJLJ) {
EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
- EmitULEB128(SizeSites, "Call site table length");
+
+ // Add extra padding if it wasn't added to the TType base offset.
+ EmitULEB128(CallSiteTableLength, "Call site table length", SizeAlign);
// Emit the landing pad site information.
unsigned idx = 0;
@@ -836,7 +798,9 @@ void DwarfException::EmitExceptionTable() {
// Emit the landing pad call site table.
EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
- EmitULEB128(SizeSites, "Call site table length");
+
+ // Add extra padding if it wasn't added to the TType base offset.
+ EmitULEB128(CallSiteTableLength, "Call site table length", SizeAlign);
for (SmallVectorImpl<CallSiteEntry>::const_iterator
I = CallSites.begin(), E = CallSites.end(); I != E; ++I) {
@@ -906,23 +870,23 @@ void DwarfException::EmitExceptionTable() {
}
// Emit the Catch TypeInfos.
- if (TypeInfos.size() != 0) EOL("-- Catch TypeInfos --");
+ if (!TypeInfos.empty()) EOL("-- Catch TypeInfos --");
for (std::vector<GlobalVariable *>::const_reverse_iterator
I = TypeInfos.rbegin(), E = TypeInfos.rend(); I != E; ++I) {
const GlobalVariable *GV = *I;
- PrintRelDirective();
if (GV) {
- O << *Asm->GetGlobalValueSymbol(GV);
+ EmitReference(GV, TTypeEncoding);
EOL("TypeInfo");
} else {
+ PrintRelDirective(TTypeEncoding);
O << "0x0";
EOL("");
}
}
// Emit the Exception Specifications.
- if (FilterIds.size() != 0) EOL("-- Filter IDs --");
+ if (!FilterIds.empty()) EOL("-- Filter IDs --");
for (std::vector<unsigned>::const_iterator
I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
unsigned TypeID = *I;
generated by cgit v1.1 at 2024-06-19 09:47:09 +0000