isString,
isLabel,
isAsIsLabel,
+ isSectionOffset,
isDelta,
isEntry,
isBlock
#endif
};
+//===----------------------------------------------------------------------===//
+/// DIESectionOffset - A section offset DIE.
+//
+class DIESectionOffset : public DIEValue {
+public:
+ const DWLabel Label;
+ const DWLabel Section;
+ bool IsEH : 1;
+ bool UseSet : 1;
+
+ DIESectionOffset(const DWLabel &Lab, const DWLabel &Sec,
+ bool isEH = false, bool useSet = true)
+ : DIEValue(isSectionOffset), Label(Lab), Section(Sec),
+ IsEH(isEH), UseSet(useSet) {}
+
+ // Implement isa/cast/dyncast.
+ static bool classof(const DIESectionOffset *) { return true; }
+ static bool classof(const DIEValue *D) { return D->Type == isSectionOffset; }
+
+ /// EmitValue - Emit section offset.
+ ///
+ virtual void EmitValue(DwarfDebug &DD, unsigned Form);
+
+ /// SizeOf - Determine size of section offset value in bytes.
+ ///
+ virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
+
+ /// Profile - Used to gather unique data for the value folding set.
+ ///
+ static void Profile(FoldingSetNodeID &ID, const DWLabel &Label,
+ const DWLabel &Section) {
+ ID.AddInteger(isSectionOffset);
+ Label.Profile(ID);
+ Section.Profile(ID);
+ // IsEH and UseSet are specific to the Label/Section that we will emit
+ // the offset for; so Label/Section are enough for uniqueness.
+ }
+ virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label, Section); }
+
+#ifndef NDEBUG
+ virtual void print(std::ostream &O) {
+ O << "Off: ";
+ Label.print(O);
+ O << "-";
+ Section.print(O);
+ O << "-" << IsEH << "-" << UseSet;
+ }
+#endif
+};
+
//===----------------------------------------------------------------------===//
/// DIEDelta - A simple label difference DIE.
///
Die->AddValue(Attribute, Form, Value);
}
+ /// AddSectionOffset - Add a section offset label attribute data and value.
+ ///
+ void AddSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
+ const DWLabel &Label, const DWLabel &Section,
+ bool isEH = false, bool useSet = true) {
+ FoldingSetNodeID ID;
+ DIESectionOffset::Profile(ID, Label, Section);
+ void *Where;
+ DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
+ if (!Value) {
+ Value = new DIESectionOffset(Label, Section, isEH, useSet);
+ ValuesSet.InsertNode(Value, Where);
+ Values.push_back(Value);
+ }
+
+ Die->AddValue(Attribute, Form, Value);
+ }
+
/// AddDelta - Add a label delta attribute data and value.
///
void AddDelta(DIE *Die, unsigned Attribute, unsigned Form,
CompileUnit *NewCompileUnit(CompileUnitDesc *UnitDesc, unsigned ID) {
// Construct debug information entry.
DIE *Die = new DIE(DW_TAG_compile_unit);
- if (TAI->isAbsoluteDebugSectionOffsets())
- AddLabel(Die, DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0));
- else
- AddDelta(Die, DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0),
- DWLabel("section_line", 0));
+ AddSectionOffset(Die, DW_AT_stmt_list, DW_FORM_data4,
+ DWLabel("section_line", 0), DWLabel("section_line", 0), false);
AddString(Die, DW_AT_producer, DW_FORM_string, UnitDesc->getProducer());
AddUInt (Die, DW_AT_language, DW_FORM_data1, UnitDesc->getLanguage());
AddString(Die, DW_AT_name, DW_FORM_string, UnitDesc->getFileName());
// Emit label for the implicitly defined dbg.stoppoint at the start of
// the function.
- const SourceLineInfo &LineInfo = MMI->getSourceLines()[0];
- Asm->printLabel(LineInfo.getLabelID());
+ const std::vector<SourceLineInfo> &LineInfos = MMI->getSourceLines();
+ if (!LineInfos.empty()) {
+ const SourceLineInfo &LineInfo = LineInfos[0];
+ Asm->printLabel(LineInfo.getLabelID());
+ }
}
/// EndFunction - Gather and emit post-function debug information.
};
std::vector<FunctionEHFrameInfo> EHFrames;
-
- /// shouldEmit - Flag to indicate if debug information should be emitted.
- ///
- bool shouldEmit;
-
+
+ /// shouldEmitTable - Per-function flag to indicate if EH tables should
+ /// be emitted.
+ bool shouldEmitTable;
+
+ /// shouldEmitMoves - Per-function flag to indicate if frame moves info
+ /// should be emitted.
+ bool shouldEmitMoves;
+
+ /// shouldEmitTableModule - Per-module flag to indicate if EH tables
+ /// should be emitted.
+ bool shouldEmitTableModule;
+
+ /// shouldEmitFrameModule - Per-module flag to indicate if frame moves
+ /// should be emitted.
+ bool shouldEmitMovesModule;
+
/// EmitCommonEHFrame - Emit the common eh unwind frame.
///
void EmitCommonEHFrame(const Function *Personality, unsigned Index) {
// Define base labels.
EmitLabel("eh_frame_common", Index);
-
+
// Define the eh frame length.
EmitDifference("eh_frame_common_end", Index,
"eh_frame_common_begin", Index, true);
Asm->EOL("CIE Identifier Tag");
Asm->EmitInt8(DW_CIE_VERSION);
Asm->EOL("CIE Version");
-
+
// The personality presence indicates that language specific information
// will show up in the eh frame.
Asm->EmitString(Personality ? "zPLR" : "zR");
Asm->EOL("CIE Augmentation");
-
+
// Round out reader.
Asm->EmitULEB128Bytes(1);
Asm->EOL("CIE Code Alignment Factor");
Asm->EmitSLEB128Bytes(stackGrowth);
- Asm->EOL("CIE Data Alignment Factor");
+ Asm->EOL("CIE Data Alignment Factor");
Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true));
- Asm->EOL("CIE RA Column");
-
+ Asm->EOL("CIE Return Address Column");
+
// If there is a personality, we need to indicate the functions location.
if (Personality) {
Asm->EmitULEB128Bytes(7);
Asm->EOL("Augmentation Size");
- if (TAI->getNeedsIndirectEncoding())
+ if (TAI->getNeedsIndirectEncoding()) {
Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect);
- else
+ Asm->EOL("Personality (pcrel sdata4 indirect)");
+ } else {
Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
+ Asm->EOL("Personality (pcrel sdata4)");
+ }
- Asm->EOL("Personality (pcrel sdata4 indirect)");
-
- PrintRelDirective(TAI->getShortenEHDataOn64Bit());
+ PrintRelDirective(true);
O << TAI->getPersonalityPrefix();
Asm->EmitExternalGlobal((const GlobalVariable *)(Personality));
O << TAI->getPersonalitySuffix();
- if (!TAI->getShortenEHDataOn64Bit()) {
+ if (strcmp(TAI->getPersonalitySuffix(), "+4@GOTPCREL"))
O << "-" << TAI->getPCSymbol();
- }
Asm->EOL("Personality");
- Asm->EmitULEB128Bytes(DW_EH_PE_pcrel);
- Asm->EOL("LSDA Encoding (pcrel)");
- Asm->EmitULEB128Bytes(DW_EH_PE_pcrel);
- Asm->EOL("FDE Encoding (pcrel)");
+ Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
+ Asm->EOL("LSDA Encoding (pcrel sdata4)");
+ Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
+ Asm->EOL("FDE Encoding (pcrel sdata4)");
} else {
Asm->EmitULEB128Bytes(1);
Asm->EOL("Augmentation Size");
- Asm->EmitULEB128Bytes(DW_EH_PE_pcrel);
- Asm->EOL("FDE Encoding (pcrel)");
+ Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
+ Asm->EOL("FDE Encoding (pcrel sdata4)");
}
// Indicate locations of general callee saved registers in frame.
RI->getInitialFrameState(Moves);
EmitFrameMoves(NULL, 0, Moves, true);
- Asm->EmitAlignment(2, 0, 0, false);
+ // 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);
EmitLabel("eh_frame_common_end", Index);
-
+
Asm->EOL();
}
-
+
/// EmitEHFrame - Emit function exception frame information.
///
void EmitEHFrame(const FunctionEHFrameInfo &EHFrameInfo) {
// 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.
+ // 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 &&
((linkage != Function::WeakLinkage &&
linkage != Function::LinkOnceLinkage) ||
!TAI->getWeakDefDirective() ||
true, true, false);
Asm->EOL("FDE CIE offset");
- EmitReference("eh_func_begin", EHFrameInfo.Number, true);
+ EmitReference("eh_func_begin", EHFrameInfo.Number, true, true);
Asm->EOL("FDE initial location");
EmitDifference("eh_func_end", EHFrameInfo.Number,
- "eh_func_begin", EHFrameInfo.Number);
+ "eh_func_begin", EHFrameInfo.Number, true);
Asm->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 (EHFrameInfo.PersonalityIndex) {
- Asm->EmitULEB128Bytes(TAI->getShortenEHDataOn64Bit() ? 8 : 4);
+ Asm->EmitULEB128Bytes(4);
Asm->EOL("Augmentation size");
-
- if (EHFrameInfo.hasLandingPads) {
- EmitReference("exception", EHFrameInfo.Number, true);
- } else if (TD->getPointerSize() == 8) {
- Asm->EmitInt64((int)0);
- } else {
+
+ if (EHFrameInfo.hasLandingPads)
+ EmitReference("exception", EHFrameInfo.Number, true, true);
+ else
Asm->EmitInt32((int)0);
- }
Asm->EOL("Language Specific Data Area");
} else {
Asm->EmitULEB128Bytes(0);
Asm->EOL("Augmentation size");
}
-
+
// Indicate locations of function specific callee saved registers in
// frame.
EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves, true);
- Asm->EmitAlignment(2, 0, 0, false);
+ // 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);
EmitLabel("eh_frame_end", EHFrameInfo.Number);
// If the function is marked used, this table should be also. We cannot
};
void EmitExceptionTable() {
- // Map all labels and get rid of any dead landing pads.
- MMI->TidyLandingPads();
-
const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
}
// Final tallies.
- unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
- sizeof(int32_t) + // Site length.
- sizeof(int32_t)); // Landing pad.
+
+ // Call sites.
+ const unsigned SiteStartSize = sizeof(int32_t); // DW_EH_PE_udata4
+ const unsigned SiteLengthSize = sizeof(int32_t); // DW_EH_PE_udata4
+ const unsigned LandingPadSize = sizeof(int32_t); // DW_EH_PE_udata4
+ unsigned SizeSites = CallSites.size() * (SiteStartSize +
+ SiteLengthSize +
+ LandingPadSize);
for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
SizeSites += Asm->SizeULEB128(CallSites[i].Action);
- unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
+ // Type infos.
+ const unsigned TypeInfoSize = TD->getPointerSize(); // DW_EH_PE_absptr
+ unsigned SizeTypes = TypeInfos.size() * TypeInfoSize;
unsigned TypeOffset = sizeof(int8_t) + // Call site format
Asm->SizeULEB128(SizeSites) + // Call-site table length
}
EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount,
- TAI->getShortenEHDataOn64Bit(), true);
+ true, true);
Asm->EOL("Region start");
if (!S.EndLabel) {
EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber,
- TAI->getShortenEHDataOn64Bit());
+ true);
} else {
- EmitDifference("label", S.EndLabel, BeginTag, BeginNumber,
- TAI->getShortenEHDataOn64Bit());
+ EmitDifference("label", S.EndLabel, BeginTag, BeginNumber, true);
}
Asm->EOL("Region length");
- if (!S.PadLabel) {
- if (TD->getPointerSize() == sizeof(int32_t) || TAI->getShortenEHDataOn64Bit())
- Asm->EmitInt32(0);
- else
- Asm->EmitInt64(0);
- } else {
+ if (!S.PadLabel)
+ Asm->EmitInt32(0);
+ else
EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount,
- TAI->getShortenEHDataOn64Bit(), true);
- }
+ true, true);
Asm->EOL("Landing pad");
Asm->EmitULEB128Bytes(S.Action);
//
DwarfException(std::ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
: Dwarf(OS, A, T, "eh")
- , shouldEmit(false)
+ , shouldEmitTable(false)
+ , shouldEmitMoves(false)
+ , shouldEmitTableModule(false)
+ , shouldEmitMovesModule(false)
{}
virtual ~DwarfException() {}
/// EndModule - Emit all exception information that should come after the
/// content.
void EndModule() {
- if (!shouldEmit) return;
-
- const std::vector<Function *> Personalities = MMI->getPersonalities();
- for (unsigned i =0; i < Personalities.size(); ++i)
- EmitCommonEHFrame(Personalities[i], i);
-
- for (std::vector<FunctionEHFrameInfo>::iterator I = EHFrames.begin(),
- E = EHFrames.end(); I != E; ++I)
- EmitEHFrame(*I);
+ if (shouldEmitMovesModule || shouldEmitTableModule) {
+ const std::vector<Function *> Personalities = MMI->getPersonalities();
+ for (unsigned i =0; i < Personalities.size(); ++i)
+ EmitCommonEHFrame(Personalities[i], i);
+
+ for (std::vector<FunctionEHFrameInfo>::iterator I = EHFrames.begin(),
+ E = EHFrames.end(); I != E; ++I)
+ EmitEHFrame(*I);
+ }
}
/// BeginFunction - Gather pre-function exception information. Assumes being
/// emitted immediately after the function entry point.
void BeginFunction(MachineFunction *MF) {
this->MF = MF;
-
- if (MMI &&
- ExceptionHandling &&
- TAI->doesSupportExceptionHandling()) {
- shouldEmit = true;
- // Assumes in correct section after the entry point.
- EmitLabel("eh_func_begin", ++SubprogramCount);
+ shouldEmitTable = shouldEmitMoves = false;
+ if (MMI && TAI->doesSupportExceptionHandling()) {
+
+ // Map all labels and get rid of any dead landing pads.
+ MMI->TidyLandingPads();
+ // If any landing pads survive, we need an EH table.
+ if (MMI->getLandingPads().size())
+ shouldEmitTable = true;
+
+ // See if we need frame move info.
+ if (MMI->hasDebugInfo() ||
+ !MF->getFunction()->doesNotThrow() ||
+ UnwindTablesMandatory)
+ shouldEmitMoves = true;
+
+ if (shouldEmitMoves || shouldEmitTable)
+ // Assumes in correct section after the entry point.
+ EmitLabel("eh_func_begin", ++SubprogramCount);
}
+ shouldEmitTableModule |= shouldEmitTable;
+ shouldEmitMovesModule |= shouldEmitMoves;
}
/// EndFunction - Gather and emit post-function exception information.
///
void EndFunction() {
- if (!shouldEmit) return;
-
- EmitLabel("eh_func_end", SubprogramCount);
- EmitExceptionTable();
+ if (shouldEmitMoves || shouldEmitTable) {
+ EmitLabel("eh_func_end", SubprogramCount);
+ EmitExceptionTable();
- // Save EH frame information
- EHFrames.
- push_back(FunctionEHFrameInfo(getAsm()->getCurrentFunctionEHName(MF),
+ // Save EH frame information
+ EHFrames.
+ push_back(FunctionEHFrameInfo(getAsm()->getCurrentFunctionEHName(MF),
SubprogramCount,
MMI->getPersonalityIndex(),
MF->getFrameInfo()->hasCalls(),
!MMI->getLandingPads().empty(),
MMI->getFrameMoves(),
MF->getFunction()));
+ }
}
};
//===----------------------------------------------------------------------===//
+/// EmitValue - Emit delta value.
+///
+void DIESectionOffset::EmitValue(DwarfDebug &DD, unsigned Form) {
+ bool IsSmall = Form == DW_FORM_data4;
+ DD.EmitSectionOffset(Label.Tag, Section.Tag,
+ Label.Number, Section.Number, IsSmall, IsEH, UseSet);
+}
+
+/// SizeOf - Determine size of delta value in bytes.
+///
+unsigned DIESectionOffset::SizeOf(const DwarfDebug &DD, unsigned Form) const {
+ if (Form == DW_FORM_data4) return 4;
+ return DD.getTargetData()->getPointerSize();
+}
+
+//===----------------------------------------------------------------------===//
+
/// EmitValue - Emit delta value.
///
void DIEDelta::EmitValue(DwarfDebug &DD, unsigned Form) {
projects / oota-llvm.git / blobdiff