1 //===-- llvm/CodeGen/DwarfWriter.cpp - Dwarf Framework ----------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for writing dwarf info into asm files.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/DwarfWriter.h"
15 #include "llvm/Module.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Constants.h"
18 #include "llvm/CodeGen/AsmPrinter.h"
19 #include "llvm/CodeGen/MachineModuleInfo.h"
20 #include "llvm/CodeGen/MachineFrameInfo.h"
21 #include "llvm/CodeGen/MachineLocation.h"
22 #include "llvm/Analysis/DebugInfo.h"
23 #include "llvm/Support/Debug.h"
24 #include "llvm/Support/Dwarf.h"
25 #include "llvm/Support/CommandLine.h"
26 #include "llvm/Support/DataTypes.h"
27 #include "llvm/Support/Mangler.h"
28 #include "llvm/Support/Timer.h"
29 #include "llvm/Support/raw_ostream.h"
30 #include "llvm/System/Path.h"
31 #include "llvm/Target/TargetAsmInfo.h"
32 #include "llvm/Target/TargetRegisterInfo.h"
33 #include "llvm/Target/TargetData.h"
34 #include "llvm/Target/TargetFrameInfo.h"
35 #include "llvm/Target/TargetInstrInfo.h"
36 #include "llvm/Target/TargetMachine.h"
37 #include "llvm/Target/TargetOptions.h"
38 #include "llvm/ADT/DenseMap.h"
39 #include "llvm/ADT/FoldingSet.h"
40 #include "llvm/ADT/StringExtras.h"
41 #include "llvm/ADT/StringMap.h"
45 using namespace llvm::dwarf;
47 static RegisterPass<DwarfWriter>
48 X("dwarfwriter", "DWARF Information Writer");
49 char DwarfWriter::ID = 0;
51 static TimerGroup &getDwarfTimerGroup() {
52 static TimerGroup DwarfTimerGroup("Dwarf Exception and Debugging");
53 return DwarfTimerGroup;
58 //===----------------------------------------------------------------------===//
60 /// Configuration values for initial hash set sizes (log2).
62 static const unsigned InitDiesSetSize = 9; // log2(512)
63 static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
64 static const unsigned InitValuesSetSize = 9; // log2(512)
66 //===----------------------------------------------------------------------===//
67 /// Forward declarations.
72 //===----------------------------------------------------------------------===//
75 /// getGlobalVariable - Return either a direct or cast Global value.
77 static GlobalVariable *getGlobalVariable(Value *V) {
78 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
80 } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
81 if (CE->getOpcode() == Instruction::BitCast) {
82 return dyn_cast<GlobalVariable>(CE->getOperand(0));
83 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
84 for (unsigned int i=1; i<CE->getNumOperands(); i++) {
85 if (!CE->getOperand(i)->isNullValue())
88 return dyn_cast<GlobalVariable>(CE->getOperand(0));
94 //===----------------------------------------------------------------------===//
95 /// DWLabel - Labels are used to track locations in the assembler file.
96 /// Labels appear in the form @verbatim <prefix><Tag><Number> @endverbatim,
97 /// where the tag is a category of label (Ex. location) and number is a value
98 /// unique in that category.
101 /// Tag - Label category tag. Should always be a staticly declared C string.
105 /// Number - Value to make label unique.
109 DWLabel(const char *T, unsigned N) : Tag(T), Number(N) {}
111 void Profile(FoldingSetNodeID &ID) const {
113 ID.AddInteger(Number);
117 void print(std::ostream *O) const {
120 void print(std::ostream &O) const {
122 if (Number) O << Number;
127 //===----------------------------------------------------------------------===//
128 /// DIEAbbrevData - Dwarf abbreviation data, describes the one attribute of a
129 /// Dwarf abbreviation.
130 class DIEAbbrevData {
131 /// Attribute - Dwarf attribute code.
135 /// Form - Dwarf form code.
139 DIEAbbrevData(unsigned A, unsigned F) : Attribute(A), Form(F) {}
142 unsigned getAttribute() const { return Attribute; }
143 unsigned getForm() const { return Form; }
145 /// Profile - Used to gather unique data for the abbreviation folding set.
147 void Profile(FoldingSetNodeID &ID)const {
148 ID.AddInteger(Attribute);
153 //===----------------------------------------------------------------------===//
154 /// DIEAbbrev - Dwarf abbreviation, describes the organization of a debug
155 /// information object.
156 class DIEAbbrev : public FoldingSetNode {
158 /// Tag - Dwarf tag code.
162 /// Unique number for node.
166 /// ChildrenFlag - Dwarf children flag.
168 unsigned ChildrenFlag;
170 /// Data - Raw data bytes for abbreviation.
172 SmallVector<DIEAbbrevData, 8> Data;
174 DIEAbbrev(unsigned T, unsigned C) : Tag(T), ChildrenFlag(C), Data() {}
175 virtual ~DIEAbbrev() {}
178 unsigned getTag() const { return Tag; }
179 unsigned getNumber() const { return Number; }
180 unsigned getChildrenFlag() const { return ChildrenFlag; }
181 const SmallVector<DIEAbbrevData, 8> &getData() const { return Data; }
182 void setTag(unsigned T) { Tag = T; }
183 void setChildrenFlag(unsigned CF) { ChildrenFlag = CF; }
184 void setNumber(unsigned N) { Number = N; }
186 /// AddAttribute - Adds another set of attribute information to the
188 void AddAttribute(unsigned Attribute, unsigned Form) {
189 Data.push_back(DIEAbbrevData(Attribute, Form));
192 /// AddFirstAttribute - Adds a set of attribute information to the front
193 /// of the abbreviation.
194 void AddFirstAttribute(unsigned Attribute, unsigned Form) {
195 Data.insert(Data.begin(), DIEAbbrevData(Attribute, Form));
198 /// Profile - Used to gather unique data for the abbreviation folding set.
200 void Profile(FoldingSetNodeID &ID) {
202 ID.AddInteger(ChildrenFlag);
204 // For each attribute description.
205 for (unsigned i = 0, N = Data.size(); i < N; ++i)
209 /// Emit - Print the abbreviation using the specified Dwarf writer.
211 void Emit(const DwarfDebug &DD) const;
214 void print(std::ostream *O) {
217 void print(std::ostream &O);
222 //===----------------------------------------------------------------------===//
223 /// DIE - A structured debug information entry. Has an abbreviation which
224 /// describes it's organization.
225 class DIE : public FoldingSetNode {
227 /// Abbrev - Buffer for constructing abbreviation.
231 /// Offset - Offset in debug info section.
235 /// Size - Size of instance + children.
241 std::vector<DIE *> Children;
243 /// Attributes values.
245 SmallVector<DIEValue*, 32> Values;
248 explicit DIE(unsigned Tag)
249 : Abbrev(Tag, DW_CHILDREN_no), Offset(0), Size(0), Children(), Values() {}
253 DIEAbbrev &getAbbrev() { return Abbrev; }
254 unsigned getAbbrevNumber() const {
255 return Abbrev.getNumber();
257 unsigned getTag() const { return Abbrev.getTag(); }
258 unsigned getOffset() const { return Offset; }
259 unsigned getSize() const { return Size; }
260 const std::vector<DIE *> &getChildren() const { return Children; }
261 SmallVector<DIEValue*, 32> &getValues() { return Values; }
262 void setTag(unsigned Tag) { Abbrev.setTag(Tag); }
263 void setOffset(unsigned O) { Offset = O; }
264 void setSize(unsigned S) { Size = S; }
266 /// AddValue - Add a value and attributes to a DIE.
268 void AddValue(unsigned Attribute, unsigned Form, DIEValue *Value) {
269 Abbrev.AddAttribute(Attribute, Form);
270 Values.push_back(Value);
273 /// SiblingOffset - Return the offset of the debug information entry's
275 unsigned SiblingOffset() const { return Offset + Size; }
277 /// AddSiblingOffset - Add a sibling offset field to the front of the DIE.
279 void AddSiblingOffset();
281 /// AddChild - Add a child to the DIE.
283 void AddChild(DIE *Child) {
284 Abbrev.setChildrenFlag(DW_CHILDREN_yes);
285 Children.push_back(Child);
288 /// Detach - Detaches objects connected to it after copying.
294 /// Profile - Used to gather unique data for the value folding set.
296 void Profile(FoldingSetNodeID &ID) ;
299 void print(std::ostream *O, unsigned IncIndent = 0) {
300 if (O) print(*O, IncIndent);
302 void print(std::ostream &O, unsigned IncIndent = 0);
307 //===----------------------------------------------------------------------===//
308 /// DIEValue - A debug information entry value.
310 class DIEValue : public FoldingSetNode {
323 /// Type - Type of data stored in the value.
327 explicit DIEValue(unsigned T) : Type(T) {}
328 virtual ~DIEValue() {}
331 unsigned getType() const { return Type; }
333 // Implement isa/cast/dyncast.
334 static bool classof(const DIEValue *) { return true; }
336 /// EmitValue - Emit value via the Dwarf writer.
338 virtual void EmitValue(DwarfDebug &DD, unsigned Form) = 0;
340 /// SizeOf - Return the size of a value in bytes.
342 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const = 0;
344 /// Profile - Used to gather unique data for the value folding set.
346 virtual void Profile(FoldingSetNodeID &ID) = 0;
349 void print(std::ostream *O) {
352 virtual void print(std::ostream &O) = 0;
357 //===----------------------------------------------------------------------===//
358 /// DWInteger - An integer value DIE.
360 class DIEInteger : public DIEValue {
365 explicit DIEInteger(uint64_t I) : DIEValue(isInteger), Integer(I) {}
367 // Implement isa/cast/dyncast.
368 static bool classof(const DIEInteger *) { return true; }
369 static bool classof(const DIEValue *I) { return I->Type == isInteger; }
371 /// BestForm - Choose the best form for integer.
373 static unsigned BestForm(bool IsSigned, uint64_t Integer) {
375 if ((char)Integer == (signed)Integer) return DW_FORM_data1;
376 if ((short)Integer == (signed)Integer) return DW_FORM_data2;
377 if ((int)Integer == (signed)Integer) return DW_FORM_data4;
379 if ((unsigned char)Integer == Integer) return DW_FORM_data1;
380 if ((unsigned short)Integer == Integer) return DW_FORM_data2;
381 if ((unsigned int)Integer == Integer) return DW_FORM_data4;
383 return DW_FORM_data8;
386 /// EmitValue - Emit integer of appropriate size.
388 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
390 /// SizeOf - Determine size of integer value in bytes.
392 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
394 /// Profile - Used to gather unique data for the value folding set.
396 static void Profile(FoldingSetNodeID &ID, unsigned Integer) {
397 ID.AddInteger(isInteger);
398 ID.AddInteger(Integer);
400 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Integer); }
403 virtual void print(std::ostream &O) {
404 O << "Int: " << (int64_t)Integer
405 << " 0x" << std::hex << Integer << std::dec;
410 //===----------------------------------------------------------------------===//
411 /// DIEString - A string value DIE.
413 class DIEString : public DIEValue {
414 const std::string Str;
416 explicit DIEString(const std::string &S) : DIEValue(isString), Str(S) {}
418 // Implement isa/cast/dyncast.
419 static bool classof(const DIEString *) { return true; }
420 static bool classof(const DIEValue *S) { return S->Type == isString; }
422 /// EmitValue - Emit string value.
424 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
426 /// SizeOf - Determine size of string value in bytes.
428 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const {
429 return Str.size() + sizeof(char); // sizeof('\0');
432 /// Profile - Used to gather unique data for the value folding set.
434 static void Profile(FoldingSetNodeID &ID, const std::string &Str) {
435 ID.AddInteger(isString);
438 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Str); }
441 virtual void print(std::ostream &O) {
442 O << "Str: \"" << Str << "\"";
447 //===----------------------------------------------------------------------===//
448 /// DIEDwarfLabel - A Dwarf internal label expression DIE.
450 class DIEDwarfLabel : public DIEValue {
453 explicit DIEDwarfLabel(const DWLabel &L) : DIEValue(isLabel), Label(L) {}
455 // Implement isa/cast/dyncast.
456 static bool classof(const DIEDwarfLabel *) { return true; }
457 static bool classof(const DIEValue *L) { return L->Type == isLabel; }
459 /// EmitValue - Emit label value.
461 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
463 /// SizeOf - Determine size of label value in bytes.
465 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
467 /// Profile - Used to gather unique data for the value folding set.
469 static void Profile(FoldingSetNodeID &ID, const DWLabel &Label) {
470 ID.AddInteger(isLabel);
473 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label); }
476 virtual void print(std::ostream &O) {
483 //===----------------------------------------------------------------------===//
484 /// DIEObjectLabel - A label to an object in code or data.
486 class DIEObjectLabel : public DIEValue {
487 const std::string Label;
489 explicit DIEObjectLabel(const std::string &L)
490 : DIEValue(isAsIsLabel), Label(L) {}
492 // Implement isa/cast/dyncast.
493 static bool classof(const DIEObjectLabel *) { return true; }
494 static bool classof(const DIEValue *L) { return L->Type == isAsIsLabel; }
496 /// EmitValue - Emit label value.
498 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
500 /// SizeOf - Determine size of label value in bytes.
502 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
504 /// Profile - Used to gather unique data for the value folding set.
506 static void Profile(FoldingSetNodeID &ID, const std::string &Label) {
507 ID.AddInteger(isAsIsLabel);
510 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label.c_str()); }
513 virtual void print(std::ostream &O) {
514 O << "Obj: " << Label;
519 //===----------------------------------------------------------------------===//
520 /// DIESectionOffset - A section offset DIE.
522 class DIESectionOffset : public DIEValue {
524 const DWLabel Section;
528 DIESectionOffset(const DWLabel &Lab, const DWLabel &Sec,
529 bool isEH = false, bool useSet = true)
530 : DIEValue(isSectionOffset), Label(Lab), Section(Sec),
531 IsEH(isEH), UseSet(useSet) {}
533 // Implement isa/cast/dyncast.
534 static bool classof(const DIESectionOffset *) { return true; }
535 static bool classof(const DIEValue *D) { return D->Type == isSectionOffset; }
537 /// EmitValue - Emit section offset.
539 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
541 /// SizeOf - Determine size of section offset value in bytes.
543 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
545 /// Profile - Used to gather unique data for the value folding set.
547 static void Profile(FoldingSetNodeID &ID, const DWLabel &Label,
548 const DWLabel &Section) {
549 ID.AddInteger(isSectionOffset);
552 // IsEH and UseSet are specific to the Label/Section that we will emit
553 // the offset for; so Label/Section are enough for uniqueness.
555 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label, Section); }
558 virtual void print(std::ostream &O) {
563 O << "-" << IsEH << "-" << UseSet;
568 //===----------------------------------------------------------------------===//
569 /// DIEDelta - A simple label difference DIE.
571 class DIEDelta : public DIEValue {
572 const DWLabel LabelHi;
573 const DWLabel LabelLo;
575 DIEDelta(const DWLabel &Hi, const DWLabel &Lo)
576 : DIEValue(isDelta), LabelHi(Hi), LabelLo(Lo) {}
578 // Implement isa/cast/dyncast.
579 static bool classof(const DIEDelta *) { return true; }
580 static bool classof(const DIEValue *D) { return D->Type == isDelta; }
582 /// EmitValue - Emit delta value.
584 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
586 /// SizeOf - Determine size of delta value in bytes.
588 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
590 /// Profile - Used to gather unique data for the value folding set.
592 static void Profile(FoldingSetNodeID &ID, const DWLabel &LabelHi,
593 const DWLabel &LabelLo) {
594 ID.AddInteger(isDelta);
598 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, LabelHi, LabelLo); }
601 virtual void print(std::ostream &O) {
610 //===----------------------------------------------------------------------===//
611 /// DIEntry - A pointer to another debug information entry. An instance of this
612 /// class can also be used as a proxy for a debug information entry not yet
613 /// defined (ie. types.)
614 class DIEntry : public DIEValue {
617 explicit DIEntry(DIE *E) : DIEValue(isEntry), Entry(E) {}
619 void setEntry(DIE *E) { Entry = E; }
621 // Implement isa/cast/dyncast.
622 static bool classof(const DIEntry *) { return true; }
623 static bool classof(const DIEValue *E) { return E->Type == isEntry; }
625 /// EmitValue - Emit debug information entry offset.
627 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
629 /// SizeOf - Determine size of debug information entry in bytes.
631 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const {
632 return sizeof(int32_t);
635 /// Profile - Used to gather unique data for the value folding set.
637 static void Profile(FoldingSetNodeID &ID, DIE *Entry) {
638 ID.AddInteger(isEntry);
639 ID.AddPointer(Entry);
641 virtual void Profile(FoldingSetNodeID &ID) {
642 ID.AddInteger(isEntry);
645 ID.AddPointer(Entry);
652 virtual void print(std::ostream &O) {
653 O << "Die: 0x" << std::hex << (intptr_t)Entry << std::dec;
658 //===----------------------------------------------------------------------===//
659 /// DIEBlock - A block of values. Primarily used for location expressions.
661 class DIEBlock : public DIEValue, public DIE {
662 unsigned Size; // Size in bytes excluding size header.
665 : DIEValue(isBlock), DIE(0), Size(0) {}
666 virtual ~DIEBlock() {}
668 // Implement isa/cast/dyncast.
669 static bool classof(const DIEBlock *) { return true; }
670 static bool classof(const DIEValue *E) { return E->Type == isBlock; }
672 /// ComputeSize - calculate the size of the block.
674 unsigned ComputeSize(DwarfDebug &DD);
676 /// BestForm - Choose the best form for data.
678 unsigned BestForm() const {
679 if ((unsigned char)Size == Size) return DW_FORM_block1;
680 if ((unsigned short)Size == Size) return DW_FORM_block2;
681 if ((unsigned int)Size == Size) return DW_FORM_block4;
682 return DW_FORM_block;
685 /// EmitValue - Emit block data.
687 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
689 /// SizeOf - Determine size of block data in bytes.
691 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
693 /// Profile - Used to gather unique data for the value folding set.
695 virtual void Profile(FoldingSetNodeID &ID) {
696 ID.AddInteger(isBlock);
701 virtual void print(std::ostream &O) {
708 //===----------------------------------------------------------------------===//
709 /// CompileUnit - This dwarf writer support class manages information associate
710 /// with a source file.
712 /// ID - File identifier for source.
716 /// Die - Compile unit debug information entry.
720 /// GVToDieMap - Tracks the mapping of unit level debug informaton
721 /// variables to debug information entries.
722 std::map<GlobalVariable *, DIE *> GVToDieMap;
724 /// GVToDIEntryMap - Tracks the mapping of unit level debug informaton
725 /// descriptors to debug information entries using a DIEntry proxy.
726 std::map<GlobalVariable *, DIEntry *> GVToDIEntryMap;
728 /// Globals - A map of globally visible named entities for this unit.
730 StringMap<DIE*> Globals;
732 /// DiesSet - Used to uniquely define dies within the compile unit.
734 FoldingSet<DIE> DiesSet;
736 CompileUnit(unsigned I, DIE *D)
737 : ID(I), Die(D), GVToDieMap(),
738 GVToDIEntryMap(), Globals(), DiesSet(InitDiesSetSize)
746 unsigned getID() const { return ID; }
747 DIE* getDie() const { return Die; }
748 StringMap<DIE*> &getGlobals() { return Globals; }
750 /// hasContent - Return true if this compile unit has something to write out.
752 bool hasContent() const {
753 return !Die->getChildren().empty();
756 /// AddGlobal - Add a new global entity to the compile unit.
758 void AddGlobal(const std::string &Name, DIE *Die) {
762 /// getDieMapSlotFor - Returns the debug information entry map slot for the
763 /// specified debug variable.
764 DIE *&getDieMapSlotFor(GlobalVariable *GV) {
765 return GVToDieMap[GV];
768 /// getDIEntrySlotFor - Returns the debug information entry proxy slot for the
769 /// specified debug variable.
770 DIEntry *&getDIEntrySlotFor(GlobalVariable *GV) {
771 return GVToDIEntryMap[GV];
774 /// AddDie - Adds or interns the DIE to the compile unit.
776 DIE *AddDie(DIE &Buffer) {
780 DIE *Die = DiesSet.FindNodeOrInsertPos(ID, Where);
783 Die = new DIE(Buffer);
784 DiesSet.InsertNode(Die, Where);
785 this->Die->AddChild(Die);
793 //===----------------------------------------------------------------------===//
794 /// Dwarf - Emits general Dwarf directives.
798 //===--------------------------------------------------------------------===//
799 // Core attributes used by the Dwarf writer.
803 /// O - Stream to .s file.
807 /// Asm - Target of Dwarf emission.
811 /// TAI - Target asm information.
812 const TargetAsmInfo *TAI;
814 /// TD - Target data.
815 const TargetData *TD;
817 /// RI - Register Information.
818 const TargetRegisterInfo *RI;
820 /// M - Current module.
824 /// MF - Current machine function.
828 /// MMI - Collected machine module information.
830 MachineModuleInfo *MMI;
832 /// SubprogramCount - The running count of functions being compiled.
834 unsigned SubprogramCount;
836 /// Flavor - A unique string indicating what dwarf producer this is, used to
838 const char * const Flavor;
841 Dwarf(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T,
846 , TD(Asm->TM.getTargetData())
847 , RI(Asm->TM.getRegisterInfo())
858 //===--------------------------------------------------------------------===//
861 const AsmPrinter *getAsm() const { return Asm; }
862 MachineModuleInfo *getMMI() const { return MMI; }
863 const TargetAsmInfo *getTargetAsmInfo() const { return TAI; }
864 const TargetData *getTargetData() const { return TD; }
866 void PrintRelDirective(bool Force32Bit = false, bool isInSection = false)
868 if (isInSection && TAI->getDwarfSectionOffsetDirective())
869 O << TAI->getDwarfSectionOffsetDirective();
870 else if (Force32Bit || TD->getPointerSize() == sizeof(int32_t))
871 O << TAI->getData32bitsDirective();
873 O << TAI->getData64bitsDirective();
876 /// PrintLabelName - Print label name in form used by Dwarf writer.
878 void PrintLabelName(DWLabel Label) const {
879 PrintLabelName(Label.Tag, Label.Number);
881 void PrintLabelName(const char *Tag, unsigned Number) const {
882 O << TAI->getPrivateGlobalPrefix() << Tag;
883 if (Number) O << Number;
886 void PrintLabelName(const char *Tag, unsigned Number,
887 const char *Suffix) const {
888 O << TAI->getPrivateGlobalPrefix() << Tag;
889 if (Number) O << Number;
893 /// EmitLabel - Emit location label for internal use by Dwarf.
895 void EmitLabel(DWLabel Label) const {
896 EmitLabel(Label.Tag, Label.Number);
898 void EmitLabel(const char *Tag, unsigned Number) const {
899 PrintLabelName(Tag, Number);
903 /// EmitReference - Emit a reference to a label.
905 void EmitReference(DWLabel Label, bool IsPCRelative = false,
906 bool Force32Bit = false) const {
907 EmitReference(Label.Tag, Label.Number, IsPCRelative, Force32Bit);
909 void EmitReference(const char *Tag, unsigned Number,
910 bool IsPCRelative = false, bool Force32Bit = false) const {
911 PrintRelDirective(Force32Bit);
912 PrintLabelName(Tag, Number);
914 if (IsPCRelative) O << "-" << TAI->getPCSymbol();
916 void EmitReference(const std::string &Name, bool IsPCRelative = false,
917 bool Force32Bit = false) const {
918 PrintRelDirective(Force32Bit);
922 if (IsPCRelative) O << "-" << TAI->getPCSymbol();
925 /// EmitDifference - Emit the difference between two labels. Some
926 /// assemblers do not behave with absolute expressions with data directives,
927 /// so there is an option (needsSet) to use an intermediary set expression.
928 void EmitDifference(DWLabel LabelHi, DWLabel LabelLo,
929 bool IsSmall = false) {
930 EmitDifference(LabelHi.Tag, LabelHi.Number,
931 LabelLo.Tag, LabelLo.Number,
934 void EmitDifference(const char *TagHi, unsigned NumberHi,
935 const char *TagLo, unsigned NumberLo,
936 bool IsSmall = false) {
937 if (TAI->needsSet()) {
939 PrintLabelName("set", SetCounter, Flavor);
941 PrintLabelName(TagHi, NumberHi);
943 PrintLabelName(TagLo, NumberLo);
946 PrintRelDirective(IsSmall);
947 PrintLabelName("set", SetCounter, Flavor);
950 PrintRelDirective(IsSmall);
952 PrintLabelName(TagHi, NumberHi);
954 PrintLabelName(TagLo, NumberLo);
958 void EmitSectionOffset(const char* Label, const char* Section,
959 unsigned LabelNumber, unsigned SectionNumber,
960 bool IsSmall = false, bool isEH = false,
961 bool useSet = true) {
962 bool printAbsolute = false;
964 printAbsolute = TAI->isAbsoluteEHSectionOffsets();
966 printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
968 if (TAI->needsSet() && useSet) {
970 PrintLabelName("set", SetCounter, Flavor);
972 PrintLabelName(Label, LabelNumber);
974 if (!printAbsolute) {
976 PrintLabelName(Section, SectionNumber);
980 PrintRelDirective(IsSmall);
982 PrintLabelName("set", SetCounter, Flavor);
985 PrintRelDirective(IsSmall, true);
987 PrintLabelName(Label, LabelNumber);
989 if (!printAbsolute) {
991 PrintLabelName(Section, SectionNumber);
996 /// EmitFrameMoves - Emit frame instructions to describe the layout of the
998 void EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
999 const std::vector<MachineMove> &Moves, bool isEH) {
1001 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
1002 TargetFrameInfo::StackGrowsUp ?
1003 TD->getPointerSize() : -TD->getPointerSize();
1004 bool IsLocal = BaseLabel && strcmp(BaseLabel, "label") == 0;
1006 for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
1007 const MachineMove &Move = Moves[i];
1008 unsigned LabelID = Move.getLabelID();
1011 LabelID = MMI->MappedLabel(LabelID);
1013 // Throw out move if the label is invalid.
1014 if (!LabelID) continue;
1017 const MachineLocation &Dst = Move.getDestination();
1018 const MachineLocation &Src = Move.getSource();
1020 // Advance row if new location.
1021 if (BaseLabel && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
1022 Asm->EmitInt8(DW_CFA_advance_loc4);
1023 Asm->EOL("DW_CFA_advance_loc4");
1024 EmitDifference("label", LabelID, BaseLabel, BaseLabelID, true);
1027 BaseLabelID = LabelID;
1028 BaseLabel = "label";
1032 // If advancing cfa.
1033 if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
1035 if (Src.getReg() == MachineLocation::VirtualFP) {
1036 Asm->EmitInt8(DW_CFA_def_cfa_offset);
1037 Asm->EOL("DW_CFA_def_cfa_offset");
1039 Asm->EmitInt8(DW_CFA_def_cfa);
1040 Asm->EOL("DW_CFA_def_cfa");
1041 Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), isEH));
1042 Asm->EOL("Register");
1045 int Offset = -Src.getOffset();
1047 Asm->EmitULEB128Bytes(Offset);
1050 assert(0 && "Machine move no supported yet.");
1052 } else if (Src.isReg() &&
1053 Src.getReg() == MachineLocation::VirtualFP) {
1055 Asm->EmitInt8(DW_CFA_def_cfa_register);
1056 Asm->EOL("DW_CFA_def_cfa_register");
1057 Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), isEH));
1058 Asm->EOL("Register");
1060 assert(0 && "Machine move no supported yet.");
1063 unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH);
1064 int Offset = Dst.getOffset() / stackGrowth;
1067 Asm->EmitInt8(DW_CFA_offset_extended_sf);
1068 Asm->EOL("DW_CFA_offset_extended_sf");
1069 Asm->EmitULEB128Bytes(Reg);
1071 Asm->EmitSLEB128Bytes(Offset);
1073 } else if (Reg < 64) {
1074 Asm->EmitInt8(DW_CFA_offset + Reg);
1075 if (Asm->isVerbose())
1076 Asm->EOL("DW_CFA_offset + Reg (" + utostr(Reg) + ")");
1079 Asm->EmitULEB128Bytes(Offset);
1082 Asm->EmitInt8(DW_CFA_offset_extended);
1083 Asm->EOL("DW_CFA_offset_extended");
1084 Asm->EmitULEB128Bytes(Reg);
1086 Asm->EmitULEB128Bytes(Offset);
1095 //===----------------------------------------------------------------------===//
1096 /// SrcLineInfo - This class is used to record source line correspondence.
1099 unsigned Line; // Source line number.
1100 unsigned Column; // Source column.
1101 unsigned SourceID; // Source ID number.
1102 unsigned LabelID; // Label in code ID number.
1104 SrcLineInfo(unsigned L, unsigned C, unsigned S, unsigned I)
1105 : Line(L), Column(C), SourceID(S), LabelID(I) {}
1108 unsigned getLine() const { return Line; }
1109 unsigned getColumn() const { return Column; }
1110 unsigned getSourceID() const { return SourceID; }
1111 unsigned getLabelID() const { return LabelID; }
1114 //===----------------------------------------------------------------------===//
1115 /// DbgVariable - This class is used to track local variable information.
1118 DIVariable Var; // Variable Descriptor.
1119 unsigned FrameIndex; // Variable frame index.
1121 DbgVariable(DIVariable V, unsigned I) : Var(V), FrameIndex(I) {}
1124 DIVariable getVariable() const { return Var; }
1125 unsigned getFrameIndex() const { return FrameIndex; }
1128 //===----------------------------------------------------------------------===//
1129 /// DbgScope - This class is used to track scope information.
1132 DbgScope *Parent; // Parent to this scope.
1133 DIDescriptor Desc; // Debug info descriptor for scope.
1134 // Either subprogram or block.
1135 unsigned StartLabelID; // Label ID of the beginning of scope.
1136 unsigned EndLabelID; // Label ID of the end of scope.
1137 SmallVector<DbgScope *, 4> Scopes; // Scopes defined in scope.
1138 SmallVector<DbgVariable *, 8> Variables;// Variables declared in scope.
1140 DbgScope(DbgScope *P, DIDescriptor D)
1141 : Parent(P), Desc(D), StartLabelID(0), EndLabelID(0), Scopes(), Variables()
1144 for (unsigned i = 0, N = Scopes.size(); i < N; ++i) delete Scopes[i];
1145 for (unsigned j = 0, M = Variables.size(); j < M; ++j) delete Variables[j];
1149 DbgScope *getParent() const { return Parent; }
1150 DIDescriptor getDesc() const { return Desc; }
1151 unsigned getStartLabelID() const { return StartLabelID; }
1152 unsigned getEndLabelID() const { return EndLabelID; }
1153 SmallVector<DbgScope *, 4> &getScopes() { return Scopes; }
1154 SmallVector<DbgVariable *, 8> &getVariables() { return Variables; }
1155 void setStartLabelID(unsigned S) { StartLabelID = S; }
1156 void setEndLabelID(unsigned E) { EndLabelID = E; }
1158 /// AddScope - Add a scope to the scope.
1160 void AddScope(DbgScope *S) { Scopes.push_back(S); }
1162 /// AddVariable - Add a variable to the scope.
1164 void AddVariable(DbgVariable *V) { Variables.push_back(V); }
1167 //===----------------------------------------------------------------------===//
1168 /// DwarfDebug - Emits Dwarf debug directives.
1170 class DwarfDebug : public Dwarf {
1171 //===--------------------------------------------------------------------===//
1172 // Attributes used to construct specific Dwarf sections.
1175 /// CompileUnitMap - A map of global variables representing compile units to
1177 DenseMap<Value *, CompileUnit *> CompileUnitMap;
1179 /// CompileUnits - All the compile units in this module.
1181 SmallVector<CompileUnit *, 8> CompileUnits;
1183 /// MainCU - Some platform prefers one compile unit per .o file. In such
1184 /// cases, all dies are inserted in MainCU.
1185 CompileUnit *MainCU;
1187 /// AbbreviationsSet - Used to uniquely define abbreviations.
1189 FoldingSet<DIEAbbrev> AbbreviationsSet;
1191 /// Abbreviations - A list of all the unique abbreviations in use.
1193 std::vector<DIEAbbrev *> Abbreviations;
1195 /// DirectoryIdMap - Directory name to directory id map.
1197 StringMap<unsigned> DirectoryIdMap;
1199 /// DirectoryNames - A list of directory names.
1200 SmallVector<std::string, 8> DirectoryNames;
1202 /// SourceFileIdMap - Source file name to source file id map.
1204 StringMap<unsigned> SourceFileIdMap;
1206 /// SourceFileNames - A list of source file names.
1207 SmallVector<std::string, 8> SourceFileNames;
1209 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
1210 /// id mapped to a unique id.
1211 DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
1213 /// SourceIds - Reverse map from source id to directory id + file id pair.
1215 SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
1217 /// Lines - List of of source line correspondence.
1218 std::vector<SrcLineInfo> Lines;
1220 /// ValuesSet - Used to uniquely define values.
1222 FoldingSet<DIEValue> ValuesSet;
1224 /// Values - A list of all the unique values in use.
1226 std::vector<DIEValue *> Values;
1228 /// StringPool - A UniqueVector of strings used by indirect references.
1230 UniqueVector<std::string> StringPool;
1232 /// SectionMap - Provides a unique id per text section.
1234 UniqueVector<const Section*> SectionMap;
1236 /// SectionSourceLines - Tracks line numbers per text section.
1238 std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
1240 /// didInitial - Flag to indicate if initial emission has been done.
1244 /// shouldEmit - Flag to indicate if debug information should be emitted.
1248 // RootDbgScope - Top level scope for the current function.
1250 DbgScope *RootDbgScope;
1252 /// DbgScopeMap - Tracks the scopes in the current function.
1253 DenseMap<GlobalVariable *, DbgScope *> DbgScopeMap;
1255 /// InlineInfo - Keep track of inlined functions and their location.
1256 /// This information is used to populate debug_inlined section.
1257 DenseMap<GlobalVariable *, SmallVector<unsigned, 4> > InlineInfo;
1259 /// DebugTimer - Timer for the Dwarf debug writer.
1262 struct FunctionDebugFrameInfo {
1264 std::vector<MachineMove> Moves;
1266 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M):
1267 Number(Num), Moves(M) { }
1270 std::vector<FunctionDebugFrameInfo> DebugFrames;
1273 /// getSourceDirectoryAndFileIds - Return the directory and file ids that
1274 /// maps to the source id. Source id starts at 1.
1275 std::pair<unsigned, unsigned>
1276 getSourceDirectoryAndFileIds(unsigned SId) const {
1277 return SourceIds[SId-1];
1280 /// getNumSourceDirectories - Return the number of source directories in the
1282 unsigned getNumSourceDirectories() const {
1283 return DirectoryNames.size();
1286 /// getSourceDirectoryName - Return the name of the directory corresponding
1288 const std::string &getSourceDirectoryName(unsigned Id) const {
1289 return DirectoryNames[Id - 1];
1292 /// getSourceFileName - Return the name of the source file corresponding
1294 const std::string &getSourceFileName(unsigned Id) const {
1295 return SourceFileNames[Id - 1];
1298 /// getNumSourceIds - Return the number of unique source ids.
1299 unsigned getNumSourceIds() const {
1300 return SourceIds.size();
1303 /// AssignAbbrevNumber - Define a unique number for the abbreviation.
1305 void AssignAbbrevNumber(DIEAbbrev &Abbrev) {
1306 // Profile the node so that we can make it unique.
1307 FoldingSetNodeID ID;
1310 // Check the set for priors.
1311 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
1313 // If it's newly added.
1314 if (InSet == &Abbrev) {
1315 // Add to abbreviation list.
1316 Abbreviations.push_back(&Abbrev);
1317 // Assign the vector position + 1 as its number.
1318 Abbrev.setNumber(Abbreviations.size());
1320 // Assign existing abbreviation number.
1321 Abbrev.setNumber(InSet->getNumber());
1325 /// NewString - Add a string to the constant pool and returns a label.
1327 DWLabel NewString(const std::string &String) {
1328 unsigned StringID = StringPool.insert(String);
1329 return DWLabel("string", StringID);
1332 /// NewDIEntry - Creates a new DIEntry to be a proxy for a debug information
1334 DIEntry *NewDIEntry(DIE *Entry = NULL) {
1338 FoldingSetNodeID ID;
1339 DIEntry::Profile(ID, Entry);
1341 Value = static_cast<DIEntry *>(ValuesSet.FindNodeOrInsertPos(ID, Where));
1343 if (Value) return Value;
1345 Value = new DIEntry(Entry);
1346 ValuesSet.InsertNode(Value, Where);
1348 Value = new DIEntry(Entry);
1351 Values.push_back(Value);
1355 /// SetDIEntry - Set a DIEntry once the debug information entry is defined.
1357 void SetDIEntry(DIEntry *Value, DIE *Entry) {
1358 Value->setEntry(Entry);
1359 // Add to values set if not already there. If it is, we merely have a
1360 // duplicate in the values list (no harm.)
1361 ValuesSet.GetOrInsertNode(Value);
1364 /// AddUInt - Add an unsigned integer attribute data and value.
1366 void AddUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer) {
1367 if (!Form) Form = DIEInteger::BestForm(false, Integer);
1369 FoldingSetNodeID ID;
1370 DIEInteger::Profile(ID, Integer);
1372 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1374 Value = new DIEInteger(Integer);
1375 ValuesSet.InsertNode(Value, Where);
1376 Values.push_back(Value);
1379 Die->AddValue(Attribute, Form, Value);
1382 /// AddSInt - Add an signed integer attribute data and value.
1384 void AddSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer) {
1385 if (!Form) Form = DIEInteger::BestForm(true, Integer);
1387 FoldingSetNodeID ID;
1388 DIEInteger::Profile(ID, (uint64_t)Integer);
1390 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1392 Value = new DIEInteger(Integer);
1393 ValuesSet.InsertNode(Value, Where);
1394 Values.push_back(Value);
1397 Die->AddValue(Attribute, Form, Value);
1400 /// AddString - Add a string attribute data and value.
1402 void AddString(DIE *Die, unsigned Attribute, unsigned Form,
1403 const std::string &String) {
1404 FoldingSetNodeID ID;
1405 DIEString::Profile(ID, String);
1407 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1409 Value = new DIEString(String);
1410 ValuesSet.InsertNode(Value, Where);
1411 Values.push_back(Value);
1414 Die->AddValue(Attribute, Form, Value);
1417 /// AddLabel - Add a Dwarf label attribute data and value.
1419 void AddLabel(DIE *Die, unsigned Attribute, unsigned Form,
1420 const DWLabel &Label) {
1421 FoldingSetNodeID ID;
1422 DIEDwarfLabel::Profile(ID, Label);
1424 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1426 Value = new DIEDwarfLabel(Label);
1427 ValuesSet.InsertNode(Value, Where);
1428 Values.push_back(Value);
1431 Die->AddValue(Attribute, Form, Value);
1434 /// AddObjectLabel - Add an non-Dwarf label attribute data and value.
1436 void AddObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
1437 const std::string &Label) {
1438 FoldingSetNodeID ID;
1439 DIEObjectLabel::Profile(ID, Label);
1441 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1443 Value = new DIEObjectLabel(Label);
1444 ValuesSet.InsertNode(Value, Where);
1445 Values.push_back(Value);
1448 Die->AddValue(Attribute, Form, Value);
1451 /// AddSectionOffset - Add a section offset label attribute data and value.
1453 void AddSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
1454 const DWLabel &Label, const DWLabel &Section,
1455 bool isEH = false, bool useSet = true) {
1456 FoldingSetNodeID ID;
1457 DIESectionOffset::Profile(ID, Label, Section);
1459 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1461 Value = new DIESectionOffset(Label, Section, isEH, useSet);
1462 ValuesSet.InsertNode(Value, Where);
1463 Values.push_back(Value);
1466 Die->AddValue(Attribute, Form, Value);
1469 /// AddDelta - Add a label delta attribute data and value.
1471 void AddDelta(DIE *Die, unsigned Attribute, unsigned Form,
1472 const DWLabel &Hi, const DWLabel &Lo) {
1473 FoldingSetNodeID ID;
1474 DIEDelta::Profile(ID, Hi, Lo);
1476 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1478 Value = new DIEDelta(Hi, Lo);
1479 ValuesSet.InsertNode(Value, Where);
1480 Values.push_back(Value);
1483 Die->AddValue(Attribute, Form, Value);
1486 /// AddDIEntry - Add a DIE attribute data and value.
1488 void AddDIEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
1489 Die->AddValue(Attribute, Form, NewDIEntry(Entry));
1492 /// AddBlock - Add block data.
1494 void AddBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block) {
1495 Block->ComputeSize(*this);
1496 FoldingSetNodeID ID;
1499 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1502 ValuesSet.InsertNode(Value, Where);
1503 Values.push_back(Value);
1505 // Already exists, reuse the previous one.
1507 Block = cast<DIEBlock>(Value);
1510 Die->AddValue(Attribute, Block->BestForm(), Value);
1513 /// AddSourceLine - Add location information to specified debug information
1515 void AddSourceLine(DIE *Die, const DIVariable *V) {
1516 unsigned FileID = 0;
1517 unsigned Line = V->getLineNumber();
1518 CompileUnit *Unit = FindCompileUnit(V->getCompileUnit());
1519 FileID = Unit->getID();
1520 assert (FileID && "Invalid file id");
1521 AddUInt(Die, DW_AT_decl_file, 0, FileID);
1522 AddUInt(Die, DW_AT_decl_line, 0, Line);
1525 /// AddSourceLine - Add location information to specified debug information
1527 void AddSourceLine(DIE *Die, const DIGlobal *G) {
1528 unsigned FileID = 0;
1529 unsigned Line = G->getLineNumber();
1530 CompileUnit *Unit = FindCompileUnit(G->getCompileUnit());
1531 FileID = Unit->getID();
1532 assert (FileID && "Invalid file id");
1533 AddUInt(Die, DW_AT_decl_file, 0, FileID);
1534 AddUInt(Die, DW_AT_decl_line, 0, Line);
1537 void AddSourceLine(DIE *Die, const DIType *Ty) {
1538 unsigned FileID = 0;
1539 unsigned Line = Ty->getLineNumber();
1540 DICompileUnit CU = Ty->getCompileUnit();
1543 CompileUnit *Unit = FindCompileUnit(CU);
1544 FileID = Unit->getID();
1545 assert (FileID && "Invalid file id");
1546 AddUInt(Die, DW_AT_decl_file, 0, FileID);
1547 AddUInt(Die, DW_AT_decl_line, 0, Line);
1550 /// AddAddress - Add an address attribute to a die based on the location
1552 void AddAddress(DIE *Die, unsigned Attribute,
1553 const MachineLocation &Location) {
1554 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
1555 DIEBlock *Block = new DIEBlock();
1557 if (Location.isReg()) {
1559 AddUInt(Block, 0, DW_FORM_data1, DW_OP_reg0 + Reg);
1561 AddUInt(Block, 0, DW_FORM_data1, DW_OP_regx);
1562 AddUInt(Block, 0, DW_FORM_udata, Reg);
1566 AddUInt(Block, 0, DW_FORM_data1, DW_OP_breg0 + Reg);
1568 AddUInt(Block, 0, DW_FORM_data1, DW_OP_bregx);
1569 AddUInt(Block, 0, DW_FORM_udata, Reg);
1571 AddUInt(Block, 0, DW_FORM_sdata, Location.getOffset());
1574 AddBlock(Die, Attribute, 0, Block);
1577 /// AddType - Add a new type attribute to the specified entity.
1578 void AddType(CompileUnit *DW_Unit, DIE *Entity, DIType Ty) {
1582 // Check for pre-existence.
1583 DIEntry *&Slot = DW_Unit->getDIEntrySlotFor(Ty.getGV());
1584 // If it exists then use the existing value.
1586 Entity->AddValue(DW_AT_type, DW_FORM_ref4, Slot);
1591 Slot = NewDIEntry();
1594 DIE Buffer(DW_TAG_base_type);
1595 if (Ty.isBasicType(Ty.getTag()))
1596 ConstructTypeDIE(DW_Unit, Buffer, DIBasicType(Ty.getGV()));
1597 else if (Ty.isDerivedType(Ty.getTag()))
1598 ConstructTypeDIE(DW_Unit, Buffer, DIDerivedType(Ty.getGV()));
1600 assert(Ty.isCompositeType(Ty.getTag()) && "Unknown kind of DIType");
1601 ConstructTypeDIE(DW_Unit, Buffer, DICompositeType(Ty.getGV()));
1604 // Add debug information entry to entity and appropriate context.
1606 DIDescriptor Context = Ty.getContext();
1607 if (!Context.isNull())
1608 Die = DW_Unit->getDieMapSlotFor(Context.getGV());
1611 DIE *Child = new DIE(Buffer);
1612 Die->AddChild(Child);
1614 SetDIEntry(Slot, Child);
1616 Die = DW_Unit->AddDie(Buffer);
1617 SetDIEntry(Slot, Die);
1620 Entity->AddValue(DW_AT_type, DW_FORM_ref4, Slot);
1623 /// ConstructTypeDIE - Construct basic type die from DIBasicType.
1624 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1627 // Get core information.
1630 Buffer.setTag(DW_TAG_base_type);
1631 AddUInt(&Buffer, DW_AT_encoding, DW_FORM_data1, BTy.getEncoding());
1632 // Add name if not anonymous or intermediate type.
1634 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1635 uint64_t Size = BTy.getSizeInBits() >> 3;
1636 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1639 /// ConstructTypeDIE - Construct derived type die from DIDerivedType.
1640 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1641 DIDerivedType DTy) {
1643 // Get core information.
1646 uint64_t Size = DTy.getSizeInBits() >> 3;
1647 unsigned Tag = DTy.getTag();
1649 // FIXME - Workaround for templates.
1650 if (Tag == DW_TAG_inheritance) Tag = DW_TAG_reference_type;
1654 // Map to main type, void will not have a type.
1655 DIType FromTy = DTy.getTypeDerivedFrom();
1656 AddType(DW_Unit, &Buffer, FromTy);
1658 // Add name if not anonymous or intermediate type.
1660 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1662 // Add size if non-zero (derived types might be zero-sized.)
1664 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1666 // Add source line info if available and TyDesc is not a forward
1668 if (!DTy.isForwardDecl())
1669 AddSourceLine(&Buffer, &DTy);
1672 /// ConstructTypeDIE - Construct type DIE from DICompositeType.
1673 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1674 DICompositeType CTy) {
1675 // Get core information.
1679 uint64_t Size = CTy.getSizeInBits() >> 3;
1680 unsigned Tag = CTy.getTag();
1684 case DW_TAG_vector_type:
1685 case DW_TAG_array_type:
1686 ConstructArrayTypeDIE(DW_Unit, Buffer, &CTy);
1688 case DW_TAG_enumeration_type:
1690 DIArray Elements = CTy.getTypeArray();
1691 // Add enumerators to enumeration type.
1692 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1693 DIE *ElemDie = NULL;
1694 DIEnumerator Enum(Elements.getElement(i).getGV());
1695 ElemDie = ConstructEnumTypeDIE(DW_Unit, &Enum);
1696 Buffer.AddChild(ElemDie);
1700 case DW_TAG_subroutine_type:
1702 // Add prototype flag.
1703 AddUInt(&Buffer, DW_AT_prototyped, DW_FORM_flag, 1);
1704 DIArray Elements = CTy.getTypeArray();
1706 DIDescriptor RTy = Elements.getElement(0);
1707 AddType(DW_Unit, &Buffer, DIType(RTy.getGV()));
1710 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1711 DIE *Arg = new DIE(DW_TAG_formal_parameter);
1712 DIDescriptor Ty = Elements.getElement(i);
1713 AddType(DW_Unit, Arg, DIType(Ty.getGV()));
1714 Buffer.AddChild(Arg);
1718 case DW_TAG_structure_type:
1719 case DW_TAG_union_type:
1720 case DW_TAG_class_type:
1722 // Add elements to structure type.
1723 DIArray Elements = CTy.getTypeArray();
1725 // A forward struct declared type may not have elements available.
1726 if (Elements.isNull())
1729 // Add elements to structure type.
1730 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1731 DIDescriptor Element = Elements.getElement(i);
1732 DIE *ElemDie = NULL;
1733 if (Element.getTag() == dwarf::DW_TAG_subprogram)
1734 ElemDie = CreateSubprogramDIE(DW_Unit,
1735 DISubprogram(Element.getGV()));
1736 else if (Element.getTag() == dwarf::DW_TAG_variable) // ???
1737 ElemDie = CreateGlobalVariableDIE(DW_Unit,
1738 DIGlobalVariable(Element.getGV()));
1740 ElemDie = CreateMemberDIE(DW_Unit,
1741 DIDerivedType(Element.getGV()));
1742 Buffer.AddChild(ElemDie);
1744 unsigned RLang = CTy.getRunTimeLang();
1746 AddUInt(&Buffer, DW_AT_APPLE_runtime_class, DW_FORM_data1, RLang);
1753 // Add name if not anonymous or intermediate type.
1755 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1757 if (Tag == DW_TAG_enumeration_type || Tag == DW_TAG_structure_type
1758 || Tag == DW_TAG_union_type) {
1759 // Add size if non-zero (derived types might be zero-sized.)
1761 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1763 // Add zero size if it is not a forward declaration.
1764 if (CTy.isForwardDecl())
1765 AddUInt(&Buffer, DW_AT_declaration, DW_FORM_flag, 1);
1767 AddUInt(&Buffer, DW_AT_byte_size, 0, 0);
1770 // Add source line info if available.
1771 if (!CTy.isForwardDecl())
1772 AddSourceLine(&Buffer, &CTy);
1776 /// ConstructSubrangeDIE - Construct subrange DIE from DISubrange.
1777 void ConstructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) {
1778 int64_t L = SR.getLo();
1779 int64_t H = SR.getHi();
1780 DIE *DW_Subrange = new DIE(DW_TAG_subrange_type);
1782 AddDIEntry(DW_Subrange, DW_AT_type, DW_FORM_ref4, IndexTy);
1784 AddSInt(DW_Subrange, DW_AT_lower_bound, 0, L);
1785 AddSInt(DW_Subrange, DW_AT_upper_bound, 0, H);
1787 Buffer.AddChild(DW_Subrange);
1790 /// ConstructArrayTypeDIE - Construct array type DIE from DICompositeType.
1791 void ConstructArrayTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1792 DICompositeType *CTy) {
1793 Buffer.setTag(DW_TAG_array_type);
1794 if (CTy->getTag() == DW_TAG_vector_type)
1795 AddUInt(&Buffer, DW_AT_GNU_vector, DW_FORM_flag, 1);
1797 // Emit derived type.
1798 AddType(DW_Unit, &Buffer, CTy->getTypeDerivedFrom());
1799 DIArray Elements = CTy->getTypeArray();
1801 // Construct an anonymous type for index type.
1802 DIE IdxBuffer(DW_TAG_base_type);
1803 AddUInt(&IdxBuffer, DW_AT_byte_size, 0, sizeof(int32_t));
1804 AddUInt(&IdxBuffer, DW_AT_encoding, DW_FORM_data1, DW_ATE_signed);
1805 DIE *IndexTy = DW_Unit->AddDie(IdxBuffer);
1807 // Add subranges to array type.
1808 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1809 DIDescriptor Element = Elements.getElement(i);
1810 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1811 ConstructSubrangeDIE(Buffer, DISubrange(Element.getGV()), IndexTy);
1815 /// ConstructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
1816 DIE *ConstructEnumTypeDIE(CompileUnit *DW_Unit, DIEnumerator *ETy) {
1818 DIE *Enumerator = new DIE(DW_TAG_enumerator);
1821 AddString(Enumerator, DW_AT_name, DW_FORM_string, Name);
1822 int64_t Value = ETy->getEnumValue();
1823 AddSInt(Enumerator, DW_AT_const_value, DW_FORM_sdata, Value);
1827 /// CreateGlobalVariableDIE - Create new DIE using GV.
1828 DIE *CreateGlobalVariableDIE(CompileUnit *DW_Unit, const DIGlobalVariable &GV)
1830 DIE *GVDie = new DIE(DW_TAG_variable);
1832 GV.getDisplayName(Name);
1833 AddString(GVDie, DW_AT_name, DW_FORM_string, Name);
1834 std::string LinkageName;
1835 GV.getLinkageName(LinkageName);
1836 if (!LinkageName.empty())
1837 AddString(GVDie, DW_AT_MIPS_linkage_name, DW_FORM_string, LinkageName);
1838 AddType(DW_Unit, GVDie, GV.getType());
1839 if (!GV.isLocalToUnit())
1840 AddUInt(GVDie, DW_AT_external, DW_FORM_flag, 1);
1841 AddSourceLine(GVDie, &GV);
1845 /// CreateMemberDIE - Create new member DIE.
1846 DIE *CreateMemberDIE(CompileUnit *DW_Unit, const DIDerivedType &DT) {
1847 DIE *MemberDie = new DIE(DT.getTag());
1851 AddString(MemberDie, DW_AT_name, DW_FORM_string, Name);
1853 AddType(DW_Unit, MemberDie, DT.getTypeDerivedFrom());
1855 AddSourceLine(MemberDie, &DT);
1857 uint64_t Size = DT.getSizeInBits();
1858 uint64_t FieldSize = DT.getOriginalTypeSize();
1860 if (Size != FieldSize) {
1862 AddUInt(MemberDie, DW_AT_byte_size, 0, DT.getOriginalTypeSize() >> 3);
1863 AddUInt(MemberDie, DW_AT_bit_size, 0, DT.getSizeInBits());
1865 uint64_t Offset = DT.getOffsetInBits();
1866 uint64_t FieldOffset = Offset;
1867 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1868 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1869 FieldOffset = (HiMark - FieldSize);
1870 Offset -= FieldOffset;
1871 // Maybe we need to work from the other end.
1872 if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size);
1873 AddUInt(MemberDie, DW_AT_bit_offset, 0, Offset);
1875 DIEBlock *Block = new DIEBlock();
1876 AddUInt(Block, 0, DW_FORM_data1, DW_OP_plus_uconst);
1877 AddUInt(Block, 0, DW_FORM_udata, DT.getOffsetInBits() >> 3);
1878 AddBlock(MemberDie, DW_AT_data_member_location, 0, Block);
1880 if (DT.isProtected())
1881 AddUInt(MemberDie, DW_AT_accessibility, 0, DW_ACCESS_protected);
1882 else if (DT.isPrivate())
1883 AddUInt(MemberDie, DW_AT_accessibility, 0, DW_ACCESS_private);
1888 /// CreateSubprogramDIE - Create new DIE using SP.
1889 DIE *CreateSubprogramDIE(CompileUnit *DW_Unit,
1890 const DISubprogram &SP,
1891 bool IsConstructor = false) {
1892 DIE *SPDie = new DIE(DW_TAG_subprogram);
1895 AddString(SPDie, DW_AT_name, DW_FORM_string, Name);
1896 std::string LinkageName;
1897 SP.getLinkageName(LinkageName);
1898 if (!LinkageName.empty())
1899 AddString(SPDie, DW_AT_MIPS_linkage_name, DW_FORM_string,
1901 AddSourceLine(SPDie, &SP);
1903 DICompositeType SPTy = SP.getType();
1904 DIArray Args = SPTy.getTypeArray();
1907 unsigned SPTag = SPTy.getTag();
1908 if (!IsConstructor) {
1909 if (Args.isNull() || SPTag != DW_TAG_subroutine_type)
1910 AddType(DW_Unit, SPDie, SPTy);
1912 AddType(DW_Unit, SPDie, DIType(Args.getElement(0).getGV()));
1915 if (!SP.isDefinition()) {
1916 AddUInt(SPDie, DW_AT_declaration, DW_FORM_flag, 1);
1918 // Do not add arguments for subprogram definition. They will be
1919 // handled through RecordVariable.
1920 if (SPTag == DW_TAG_subroutine_type)
1921 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1922 DIE *Arg = new DIE(DW_TAG_formal_parameter);
1923 AddType(DW_Unit, Arg, DIType(Args.getElement(i).getGV()));
1924 AddUInt(Arg, DW_AT_artificial, DW_FORM_flag, 1); // ???
1925 SPDie->AddChild(Arg);
1929 unsigned Lang = SP.getCompileUnit().getLanguage();
1930 if (Lang == DW_LANG_C99 || Lang == DW_LANG_C89
1931 || Lang == DW_LANG_ObjC)
1932 AddUInt(SPDie, DW_AT_prototyped, DW_FORM_flag, 1);
1934 if (!SP.isLocalToUnit())
1935 AddUInt(SPDie, DW_AT_external, DW_FORM_flag, 1);
1939 /// FindCompileUnit - Get the compile unit for the given descriptor.
1941 CompileUnit *FindCompileUnit(DICompileUnit Unit) {
1942 CompileUnit *DW_Unit = CompileUnitMap[Unit.getGV()];
1943 assert(DW_Unit && "Missing compile unit.");
1947 /// NewDbgScopeVariable - Create a new scope variable.
1949 DIE *NewDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit) {
1950 // Get the descriptor.
1951 const DIVariable &VD = DV->getVariable();
1953 // Translate tag to proper Dwarf tag. The result variable is dropped for
1956 switch (VD.getTag()) {
1957 case DW_TAG_return_variable: return NULL;
1958 case DW_TAG_arg_variable: Tag = DW_TAG_formal_parameter; break;
1959 case DW_TAG_auto_variable: // fall thru
1960 default: Tag = DW_TAG_variable; break;
1963 // Define variable debug information entry.
1964 DIE *VariableDie = new DIE(Tag);
1967 AddString(VariableDie, DW_AT_name, DW_FORM_string, Name);
1969 // Add source line info if available.
1970 AddSourceLine(VariableDie, &VD);
1972 // Add variable type.
1973 AddType(Unit, VariableDie, VD.getType());
1975 // Add variable address.
1976 MachineLocation Location;
1977 Location.set(RI->getFrameRegister(*MF),
1978 RI->getFrameIndexOffset(*MF, DV->getFrameIndex()));
1979 AddAddress(VariableDie, DW_AT_location, Location);
1984 /// getOrCreateScope - Returns the scope associated with the given descriptor.
1986 DbgScope *getOrCreateScope(GlobalVariable *V) {
1987 DbgScope *&Slot = DbgScopeMap[V];
1988 if (Slot) return Slot;
1990 // FIXME - breaks down when the context is an inlined function.
1991 DIDescriptor ParentDesc;
1992 DIDescriptor Desc(V);
1994 if (Desc.getTag() == dwarf::DW_TAG_lexical_block) {
1996 ParentDesc = Block.getContext();
1999 DbgScope *Parent = ParentDesc.isNull() ?
2000 NULL : getOrCreateScope(ParentDesc.getGV());
2001 Slot = new DbgScope(Parent, Desc);
2004 Parent->AddScope(Slot);
2005 } else if (RootDbgScope) {
2006 // FIXME - Add inlined function scopes to the root so we can delete them
2007 // later. Long term, handle inlined functions properly.
2008 RootDbgScope->AddScope(Slot);
2010 // First function is top level function.
2011 RootDbgScope = Slot;
2017 /// ConstructDbgScope - Construct the components of a scope.
2019 void ConstructDbgScope(DbgScope *ParentScope,
2020 unsigned ParentStartID, unsigned ParentEndID,
2021 DIE *ParentDie, CompileUnit *Unit) {
2022 // Add variables to scope.
2023 SmallVector<DbgVariable *, 8> &Variables = ParentScope->getVariables();
2024 for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
2025 DIE *VariableDie = NewDbgScopeVariable(Variables[i], Unit);
2026 if (VariableDie) ParentDie->AddChild(VariableDie);
2029 // Add nested scopes.
2030 SmallVector<DbgScope *, 4> &Scopes = ParentScope->getScopes();
2031 for (unsigned j = 0, M = Scopes.size(); j < M; ++j) {
2032 // Define the Scope debug information entry.
2033 DbgScope *Scope = Scopes[j];
2035 unsigned StartID = MMI->MappedLabel(Scope->getStartLabelID());
2036 unsigned EndID = MMI->MappedLabel(Scope->getEndLabelID());
2038 // Ignore empty scopes.
2039 if (StartID == EndID && StartID != 0) continue;
2041 // Do not ignore inlined scope even if it is empty. Inlined scope
2042 // does not have any parent.
2043 if (Scope->getParent()
2044 && Scope->getScopes().empty() && Scope->getVariables().empty())
2047 if (StartID == ParentStartID && EndID == ParentEndID) {
2048 // Just add stuff to the parent scope.
2049 ConstructDbgScope(Scope, ParentStartID, ParentEndID, ParentDie, Unit);
2051 DIE *ScopeDie = new DIE(DW_TAG_lexical_block);
2053 // Add the scope bounds.
2055 AddLabel(ScopeDie, DW_AT_low_pc, DW_FORM_addr,
2056 DWLabel("label", StartID));
2058 AddLabel(ScopeDie, DW_AT_low_pc, DW_FORM_addr,
2059 DWLabel("func_begin", SubprogramCount));
2062 AddLabel(ScopeDie, DW_AT_high_pc, DW_FORM_addr,
2063 DWLabel("label", EndID));
2065 AddLabel(ScopeDie, DW_AT_high_pc, DW_FORM_addr,
2066 DWLabel("func_end", SubprogramCount));
2069 // Add the scope contents.
2070 ConstructDbgScope(Scope, StartID, EndID, ScopeDie, Unit);
2071 ParentDie->AddChild(ScopeDie);
2076 /// ConstructRootDbgScope - Construct the scope for the subprogram.
2078 void ConstructRootDbgScope(DbgScope *RootScope) {
2079 // Exit if there is no root scope.
2080 if (!RootScope) return;
2081 DIDescriptor Desc = RootScope->getDesc();
2085 // Get the subprogram debug information entry.
2086 DISubprogram SPD(Desc.getGV());
2088 // Get the compile unit context.
2089 CompileUnit *Unit = MainCU;
2091 Unit = FindCompileUnit(SPD.getCompileUnit());
2093 // Get the subprogram die.
2094 DIE *SPDie = Unit->getDieMapSlotFor(SPD.getGV());
2095 assert(SPDie && "Missing subprogram descriptor");
2097 // Add the function bounds.
2098 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2099 DWLabel("func_begin", SubprogramCount));
2100 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2101 DWLabel("func_end", SubprogramCount));
2102 MachineLocation Location(RI->getFrameRegister(*MF));
2103 AddAddress(SPDie, DW_AT_frame_base, Location);
2105 ConstructDbgScope(RootScope, 0, 0, SPDie, Unit);
2108 /// ConstructDefaultDbgScope - Construct a default scope for the subprogram.
2110 void ConstructDefaultDbgScope(MachineFunction *MF) {
2111 const char *FnName = MF->getFunction()->getNameStart();
2113 StringMap<DIE*> &Globals = MainCU->getGlobals();
2114 StringMap<DIE*>::iterator GI = Globals.find(FnName);
2115 if (GI != Globals.end()) {
2116 DIE *SPDie = GI->second;
2118 // Add the function bounds.
2119 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2120 DWLabel("func_begin", SubprogramCount));
2121 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2122 DWLabel("func_end", SubprogramCount));
2124 MachineLocation Location(RI->getFrameRegister(*MF));
2125 AddAddress(SPDie, DW_AT_frame_base, Location);
2129 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i) {
2130 CompileUnit *Unit = CompileUnits[i];
2131 StringMap<DIE*> &Globals = Unit->getGlobals();
2132 StringMap<DIE*>::iterator GI = Globals.find(FnName);
2133 if (GI != Globals.end()) {
2134 DIE *SPDie = GI->second;
2136 // Add the function bounds.
2137 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2138 DWLabel("func_begin", SubprogramCount));
2139 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2140 DWLabel("func_end", SubprogramCount));
2142 MachineLocation Location(RI->getFrameRegister(*MF));
2143 AddAddress(SPDie, DW_AT_frame_base, Location);
2150 // FIXME: This is causing an abort because C++ mangled names are compared
2151 // with their unmangled counterparts. See PR2885. Don't do this assert.
2152 assert(0 && "Couldn't find DIE for machine function!");
2157 /// EmitInitial - Emit initial Dwarf declarations. This is necessary for cc
2158 /// tools to recognize the object file contains Dwarf information.
2159 void EmitInitial() {
2160 // Check to see if we already emitted intial headers.
2161 if (didInitial) return;
2164 // Dwarf sections base addresses.
2165 if (TAI->doesDwarfRequireFrameSection()) {
2166 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2167 EmitLabel("section_debug_frame", 0);
2169 Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
2170 EmitLabel("section_info", 0);
2171 Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
2172 EmitLabel("section_abbrev", 0);
2173 Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
2174 EmitLabel("section_aranges", 0);
2175 if (TAI->doesSupportMacInfoSection()) {
2176 Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
2177 EmitLabel("section_macinfo", 0);
2179 Asm->SwitchToDataSection(TAI->getDwarfLineSection());
2180 EmitLabel("section_line", 0);
2181 Asm->SwitchToDataSection(TAI->getDwarfLocSection());
2182 EmitLabel("section_loc", 0);
2183 Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
2184 EmitLabel("section_pubnames", 0);
2185 Asm->SwitchToDataSection(TAI->getDwarfStrSection());
2186 EmitLabel("section_str", 0);
2187 Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
2188 EmitLabel("section_ranges", 0);
2190 Asm->SwitchToSection(TAI->getTextSection());
2191 EmitLabel("text_begin", 0);
2192 Asm->SwitchToSection(TAI->getDataSection());
2193 EmitLabel("data_begin", 0);
2196 /// EmitDIE - Recusively Emits a debug information entry.
2198 void EmitDIE(DIE *Die) {
2199 // Get the abbreviation for this DIE.
2200 unsigned AbbrevNumber = Die->getAbbrevNumber();
2201 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2205 // Emit the code (index) for the abbreviation.
2206 Asm->EmitULEB128Bytes(AbbrevNumber);
2208 if (Asm->isVerbose())
2209 Asm->EOL(std::string("Abbrev [" +
2210 utostr(AbbrevNumber) +
2211 "] 0x" + utohexstr(Die->getOffset()) +
2212 ":0x" + utohexstr(Die->getSize()) + " " +
2213 TagString(Abbrev->getTag())));
2217 SmallVector<DIEValue*, 32> &Values = Die->getValues();
2218 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2220 // Emit the DIE attribute values.
2221 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2222 unsigned Attr = AbbrevData[i].getAttribute();
2223 unsigned Form = AbbrevData[i].getForm();
2224 assert(Form && "Too many attributes for DIE (check abbreviation)");
2227 case DW_AT_sibling: {
2228 Asm->EmitInt32(Die->SiblingOffset());
2232 // Emit an attribute using the defined form.
2233 Values[i]->EmitValue(*this, Form);
2238 Asm->EOL(AttributeString(Attr));
2241 // Emit the DIE children if any.
2242 if (Abbrev->getChildrenFlag() == DW_CHILDREN_yes) {
2243 const std::vector<DIE *> &Children = Die->getChildren();
2245 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
2246 EmitDIE(Children[j]);
2249 Asm->EmitInt8(0); Asm->EOL("End Of Children Mark");
2253 /// SizeAndOffsetDie - Compute the size and offset of a DIE.
2255 unsigned SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last) {
2256 // Get the children.
2257 const std::vector<DIE *> &Children = Die->getChildren();
2259 // If not last sibling and has children then add sibling offset attribute.
2260 if (!Last && !Children.empty()) Die->AddSiblingOffset();
2262 // Record the abbreviation.
2263 AssignAbbrevNumber(Die->getAbbrev());
2265 // Get the abbreviation for this DIE.
2266 unsigned AbbrevNumber = Die->getAbbrevNumber();
2267 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2270 Die->setOffset(Offset);
2272 // Start the size with the size of abbreviation code.
2273 Offset += TargetAsmInfo::getULEB128Size(AbbrevNumber);
2275 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2276 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2278 // Size the DIE attribute values.
2279 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2280 // Size attribute value.
2281 Offset += Values[i]->SizeOf(*this, AbbrevData[i].getForm());
2284 // Size the DIE children if any.
2285 if (!Children.empty()) {
2286 assert(Abbrev->getChildrenFlag() == DW_CHILDREN_yes &&
2287 "Children flag not set");
2289 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
2290 Offset = SizeAndOffsetDie(Children[j], Offset, (j + 1) == M);
2293 // End of children marker.
2294 Offset += sizeof(int8_t);
2297 Die->setSize(Offset - Die->getOffset());
2301 /// SizeAndOffsets - Compute the size and offset of all the DIEs.
2303 void SizeAndOffsets() {
2304 // Process base compile unit.
2306 // Compute size of compile unit header
2307 unsigned Offset = sizeof(int32_t) + // Length of Compilation Unit Info
2308 sizeof(int16_t) + // DWARF version number
2309 sizeof(int32_t) + // Offset Into Abbrev. Section
2310 sizeof(int8_t); // Pointer Size (in bytes)
2311 SizeAndOffsetDie(MainCU->getDie(), Offset, true);
2314 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i) {
2315 CompileUnit *Unit = CompileUnits[i];
2316 // Compute size of compile unit header
2317 unsigned Offset = sizeof(int32_t) + // Length of Compilation Unit Info
2318 sizeof(int16_t) + // DWARF version number
2319 sizeof(int32_t) + // Offset Into Abbrev. Section
2320 sizeof(int8_t); // Pointer Size (in bytes)
2321 SizeAndOffsetDie(Unit->getDie(), Offset, true);
2325 /// EmitDebugInfo / EmitDebugInfoPerCU - Emit the debug info section.
2327 void EmitDebugInfoPerCU(CompileUnit *Unit) {
2328 DIE *Die = Unit->getDie();
2329 // Emit the compile units header.
2330 EmitLabel("info_begin", Unit->getID());
2331 // Emit size of content not including length itself
2332 unsigned ContentSize = Die->getSize() +
2333 sizeof(int16_t) + // DWARF version number
2334 sizeof(int32_t) + // Offset Into Abbrev. Section
2335 sizeof(int8_t) + // Pointer Size (in bytes)
2336 sizeof(int32_t); // FIXME - extra pad for gdb bug.
2338 Asm->EmitInt32(ContentSize); Asm->EOL("Length of Compilation Unit Info");
2339 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
2340 EmitSectionOffset("abbrev_begin", "section_abbrev", 0, 0, true, false);
2341 Asm->EOL("Offset Into Abbrev. Section");
2342 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
2345 // FIXME - extra padding for gdb bug.
2346 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2347 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2348 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2349 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2350 EmitLabel("info_end", Unit->getID());
2355 void EmitDebugInfo() {
2356 // Start debug info section.
2357 Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
2360 EmitDebugInfoPerCU(MainCU);
2364 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i)
2365 EmitDebugInfoPerCU(CompileUnits[i]);
2368 /// EmitAbbreviations - Emit the abbreviation section.
2370 void EmitAbbreviations() const {
2371 // Check to see if it is worth the effort.
2372 if (!Abbreviations.empty()) {
2373 // Start the debug abbrev section.
2374 Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
2376 EmitLabel("abbrev_begin", 0);
2378 // For each abbrevation.
2379 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2380 // Get abbreviation data
2381 const DIEAbbrev *Abbrev = Abbreviations[i];
2383 // Emit the abbrevations code (base 1 index.)
2384 Asm->EmitULEB128Bytes(Abbrev->getNumber());
2385 Asm->EOL("Abbreviation Code");
2387 // Emit the abbreviations data.
2388 Abbrev->Emit(*this);
2393 // Mark end of abbreviations.
2394 Asm->EmitULEB128Bytes(0); Asm->EOL("EOM(3)");
2396 EmitLabel("abbrev_end", 0);
2402 /// EmitEndOfLineMatrix - Emit the last address of the section and the end of
2403 /// the line matrix.
2405 void EmitEndOfLineMatrix(unsigned SectionEnd) {
2406 // Define last address of section.
2407 Asm->EmitInt8(0); Asm->EOL("Extended Op");
2408 Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
2409 Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
2410 EmitReference("section_end", SectionEnd); Asm->EOL("Section end label");
2412 // Mark end of matrix.
2413 Asm->EmitInt8(0); Asm->EOL("DW_LNE_end_sequence");
2414 Asm->EmitULEB128Bytes(1); Asm->EOL();
2415 Asm->EmitInt8(1); Asm->EOL();
2418 /// EmitDebugLines - Emit source line information.
2420 void EmitDebugLines() {
2421 // If the target is using .loc/.file, the assembler will be emitting the
2422 // .debug_line table automatically.
2423 if (TAI->hasDotLocAndDotFile())
2426 // Minimum line delta, thus ranging from -10..(255-10).
2427 const int MinLineDelta = -(DW_LNS_fixed_advance_pc + 1);
2428 // Maximum line delta, thus ranging from -10..(255-10).
2429 const int MaxLineDelta = 255 + MinLineDelta;
2431 // Start the dwarf line section.
2432 Asm->SwitchToDataSection(TAI->getDwarfLineSection());
2434 // Construct the section header.
2436 EmitDifference("line_end", 0, "line_begin", 0, true);
2437 Asm->EOL("Length of Source Line Info");
2438 EmitLabel("line_begin", 0);
2440 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
2442 EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0, true);
2443 Asm->EOL("Prolog Length");
2444 EmitLabel("line_prolog_begin", 0);
2446 Asm->EmitInt8(1); Asm->EOL("Minimum Instruction Length");
2448 Asm->EmitInt8(1); Asm->EOL("Default is_stmt_start flag");
2450 Asm->EmitInt8(MinLineDelta); Asm->EOL("Line Base Value (Special Opcodes)");
2452 Asm->EmitInt8(MaxLineDelta); Asm->EOL("Line Range Value (Special Opcodes)");
2454 Asm->EmitInt8(-MinLineDelta); Asm->EOL("Special Opcode Base");
2456 // Line number standard opcode encodings argument count
2457 Asm->EmitInt8(0); Asm->EOL("DW_LNS_copy arg count");
2458 Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_pc arg count");
2459 Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_line arg count");
2460 Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_file arg count");
2461 Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_column arg count");
2462 Asm->EmitInt8(0); Asm->EOL("DW_LNS_negate_stmt arg count");
2463 Asm->EmitInt8(0); Asm->EOL("DW_LNS_set_basic_block arg count");
2464 Asm->EmitInt8(0); Asm->EOL("DW_LNS_const_add_pc arg count");
2465 Asm->EmitInt8(1); Asm->EOL("DW_LNS_fixed_advance_pc arg count");
2467 // Emit directories.
2468 for (unsigned DI = 1, DE = getNumSourceDirectories()+1; DI != DE; ++DI) {
2469 Asm->EmitString(getSourceDirectoryName(DI));
2470 Asm->EOL("Directory");
2472 Asm->EmitInt8(0); Asm->EOL("End of directories");
2475 for (unsigned SI = 1, SE = getNumSourceIds()+1; SI != SE; ++SI) {
2476 // Remember source id starts at 1.
2477 std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(SI);
2478 Asm->EmitString(getSourceFileName(Id.second));
2480 Asm->EmitULEB128Bytes(Id.first);
2481 Asm->EOL("Directory #");
2482 Asm->EmitULEB128Bytes(0);
2483 Asm->EOL("Mod date");
2484 Asm->EmitULEB128Bytes(0);
2485 Asm->EOL("File size");
2487 Asm->EmitInt8(0); Asm->EOL("End of files");
2489 EmitLabel("line_prolog_end", 0);
2491 // A sequence for each text section.
2492 unsigned SecSrcLinesSize = SectionSourceLines.size();
2494 for (unsigned j = 0; j < SecSrcLinesSize; ++j) {
2495 // Isolate current sections line info.
2496 const std::vector<SrcLineInfo> &LineInfos = SectionSourceLines[j];
2498 if (Asm->isVerbose()) {
2499 const Section* S = SectionMap[j + 1];
2500 O << '\t' << TAI->getCommentString() << " Section"
2501 << S->getName() << '\n';
2505 // Dwarf assumes we start with first line of first source file.
2506 unsigned Source = 1;
2509 // Construct rows of the address, source, line, column matrix.
2510 for (unsigned i = 0, N = LineInfos.size(); i < N; ++i) {
2511 const SrcLineInfo &LineInfo = LineInfos[i];
2512 unsigned LabelID = MMI->MappedLabel(LineInfo.getLabelID());
2513 if (!LabelID) continue;
2515 if (!Asm->isVerbose())
2518 std::pair<unsigned, unsigned> SourceID =
2519 getSourceDirectoryAndFileIds(LineInfo.getSourceID());
2520 O << '\t' << TAI->getCommentString() << ' '
2521 << getSourceDirectoryName(SourceID.first) << ' '
2522 << getSourceFileName(SourceID.second)
2523 <<" :" << utostr_32(LineInfo.getLine()) << '\n';
2526 // Define the line address.
2527 Asm->EmitInt8(0); Asm->EOL("Extended Op");
2528 Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
2529 Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
2530 EmitReference("label", LabelID); Asm->EOL("Location label");
2532 // If change of source, then switch to the new source.
2533 if (Source != LineInfo.getSourceID()) {
2534 Source = LineInfo.getSourceID();
2535 Asm->EmitInt8(DW_LNS_set_file); Asm->EOL("DW_LNS_set_file");
2536 Asm->EmitULEB128Bytes(Source); Asm->EOL("New Source");
2539 // If change of line.
2540 if (Line != LineInfo.getLine()) {
2541 // Determine offset.
2542 int Offset = LineInfo.getLine() - Line;
2543 int Delta = Offset - MinLineDelta;
2546 Line = LineInfo.getLine();
2548 // If delta is small enough and in range...
2549 if (Delta >= 0 && Delta < (MaxLineDelta - 1)) {
2550 // ... then use fast opcode.
2551 Asm->EmitInt8(Delta - MinLineDelta); Asm->EOL("Line Delta");
2553 // ... otherwise use long hand.
2554 Asm->EmitInt8(DW_LNS_advance_line); Asm->EOL("DW_LNS_advance_line");
2555 Asm->EmitSLEB128Bytes(Offset); Asm->EOL("Line Offset");
2556 Asm->EmitInt8(DW_LNS_copy); Asm->EOL("DW_LNS_copy");
2559 // Copy the previous row (different address or source)
2560 Asm->EmitInt8(DW_LNS_copy); Asm->EOL("DW_LNS_copy");
2564 EmitEndOfLineMatrix(j + 1);
2567 if (SecSrcLinesSize == 0)
2568 // Because we're emitting a debug_line section, we still need a line
2569 // table. The linker and friends expect it to exist. If there's nothing to
2570 // put into it, emit an empty table.
2571 EmitEndOfLineMatrix(1);
2573 EmitLabel("line_end", 0);
2578 /// EmitCommonDebugFrame - Emit common frame info into a debug frame section.
2580 void EmitCommonDebugFrame() {
2581 if (!TAI->doesDwarfRequireFrameSection())
2585 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
2586 TargetFrameInfo::StackGrowsUp ?
2587 TD->getPointerSize() : -TD->getPointerSize();
2589 // Start the dwarf frame section.
2590 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2592 EmitLabel("debug_frame_common", 0);
2593 EmitDifference("debug_frame_common_end", 0,
2594 "debug_frame_common_begin", 0, true);
2595 Asm->EOL("Length of Common Information Entry");
2597 EmitLabel("debug_frame_common_begin", 0);
2598 Asm->EmitInt32((int)DW_CIE_ID);
2599 Asm->EOL("CIE Identifier Tag");
2600 Asm->EmitInt8(DW_CIE_VERSION);
2601 Asm->EOL("CIE Version");
2602 Asm->EmitString("");
2603 Asm->EOL("CIE Augmentation");
2604 Asm->EmitULEB128Bytes(1);
2605 Asm->EOL("CIE Code Alignment Factor");
2606 Asm->EmitSLEB128Bytes(stackGrowth);
2607 Asm->EOL("CIE Data Alignment Factor");
2608 Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), false));
2609 Asm->EOL("CIE RA Column");
2611 std::vector<MachineMove> Moves;
2612 RI->getInitialFrameState(Moves);
2614 EmitFrameMoves(NULL, 0, Moves, false);
2616 Asm->EmitAlignment(2, 0, 0, false);
2617 EmitLabel("debug_frame_common_end", 0);
2622 /// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
2624 void EmitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo) {
2625 if (!TAI->doesDwarfRequireFrameSection())
2628 // Start the dwarf frame section.
2629 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2631 EmitDifference("debug_frame_end", DebugFrameInfo.Number,
2632 "debug_frame_begin", DebugFrameInfo.Number, true);
2633 Asm->EOL("Length of Frame Information Entry");
2635 EmitLabel("debug_frame_begin", DebugFrameInfo.Number);
2637 EmitSectionOffset("debug_frame_common", "section_debug_frame",
2639 Asm->EOL("FDE CIE offset");
2641 EmitReference("func_begin", DebugFrameInfo.Number);
2642 Asm->EOL("FDE initial location");
2643 EmitDifference("func_end", DebugFrameInfo.Number,
2644 "func_begin", DebugFrameInfo.Number);
2645 Asm->EOL("FDE address range");
2647 EmitFrameMoves("func_begin", DebugFrameInfo.Number, DebugFrameInfo.Moves,
2650 Asm->EmitAlignment(2, 0, 0, false);
2651 EmitLabel("debug_frame_end", DebugFrameInfo.Number);
2656 void EmitDebugPubNamesPerCU(CompileUnit *Unit) {
2657 EmitDifference("pubnames_end", Unit->getID(),
2658 "pubnames_begin", Unit->getID(), true);
2659 Asm->EOL("Length of Public Names Info");
2661 EmitLabel("pubnames_begin", Unit->getID());
2663 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF Version");
2665 EmitSectionOffset("info_begin", "section_info",
2666 Unit->getID(), 0, true, false);
2667 Asm->EOL("Offset of Compilation Unit Info");
2669 EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID(),
2671 Asm->EOL("Compilation Unit Length");
2673 StringMap<DIE*> &Globals = Unit->getGlobals();
2674 for (StringMap<DIE*>::const_iterator
2675 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2676 const char *Name = GI->getKeyData();
2677 DIE * Entity = GI->second;
2679 Asm->EmitInt32(Entity->getOffset()); Asm->EOL("DIE offset");
2680 Asm->EmitString(Name, strlen(Name)); Asm->EOL("External Name");
2683 Asm->EmitInt32(0); Asm->EOL("End Mark");
2684 EmitLabel("pubnames_end", Unit->getID());
2689 /// EmitDebugPubNames - Emit visible names into a debug pubnames section.
2691 void EmitDebugPubNames() {
2692 // Start the dwarf pubnames section.
2693 Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
2696 EmitDebugPubNamesPerCU(MainCU);
2700 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i)
2701 EmitDebugPubNamesPerCU(CompileUnits[i]);
2704 /// EmitDebugStr - Emit visible names into a debug str section.
2706 void EmitDebugStr() {
2707 // Check to see if it is worth the effort.
2708 if (!StringPool.empty()) {
2709 // Start the dwarf str section.
2710 Asm->SwitchToDataSection(TAI->getDwarfStrSection());
2712 // For each of strings in the string pool.
2713 for (unsigned StringID = 1, N = StringPool.size();
2714 StringID <= N; ++StringID) {
2715 // Emit a label for reference from debug information entries.
2716 EmitLabel("string", StringID);
2717 // Emit the string itself.
2718 const std::string &String = StringPool[StringID];
2719 Asm->EmitString(String); Asm->EOL();
2726 /// EmitDebugLoc - Emit visible names into a debug loc section.
2728 void EmitDebugLoc() {
2729 // Start the dwarf loc section.
2730 Asm->SwitchToDataSection(TAI->getDwarfLocSection());
2735 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2737 void EmitDebugARanges() {
2738 // Start the dwarf aranges section.
2739 Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
2743 CompileUnit *Unit = GetBaseCompileUnit();
2745 // Don't include size of length
2746 Asm->EmitInt32(0x1c); Asm->EOL("Length of Address Ranges Info");
2748 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("Dwarf Version");
2750 EmitReference("info_begin", Unit->getID());
2751 Asm->EOL("Offset of Compilation Unit Info");
2753 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Size of Address");
2755 Asm->EmitInt8(0); Asm->EOL("Size of Segment Descriptor");
2757 Asm->EmitInt16(0); Asm->EOL("Pad (1)");
2758 Asm->EmitInt16(0); Asm->EOL("Pad (2)");
2761 EmitReference("text_begin", 0); Asm->EOL("Address");
2762 EmitDifference("text_end", 0, "text_begin", 0, true); Asm->EOL("Length");
2764 Asm->EmitInt32(0); Asm->EOL("EOM (1)");
2765 Asm->EmitInt32(0); Asm->EOL("EOM (2)");
2771 /// EmitDebugRanges - Emit visible names into a debug ranges section.
2773 void EmitDebugRanges() {
2774 // Start the dwarf ranges section.
2775 Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
2780 /// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
2782 void EmitDebugMacInfo() {
2783 if (TAI->doesSupportMacInfoSection()) {
2784 // Start the dwarf macinfo section.
2785 Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
2791 /// EmitDebugInlineInfo - Emit inline info using following format.
2793 /// 1. length of section
2794 /// 2. Dwarf version number
2795 /// 3. address size.
2797 /// Entries (one "entry" for each function that was inlined):
2799 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
2800 /// otherwise offset into __debug_str for regular function name.
2801 /// 2. offset into __debug_str section for regular function name.
2802 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
2803 /// instances for the function.
2805 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
2806 /// inlined instance; the die_offset points to the inlined_subroutine die in
2807 /// the __debug_info section, and the low_pc is the starting address for the
2808 /// inlining instance.
2809 void EmitDebugInlineInfo() {
2810 if (!TAI->doesDwarfUsesInlineInfoSection())
2816 Asm->SwitchToDataSection(TAI->getDwarfDebugInlineSection());
2818 EmitDifference("debug_inlined_end", 1,
2819 "debug_inlined_begin", 1, true);
2820 Asm->EOL("Length of Debug Inlined Information Entry");
2822 EmitLabel("debug_inlined_begin", 1);
2824 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("Dwarf Version");
2825 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
2827 for (DenseMap<GlobalVariable *, SmallVector<unsigned, 4> >::iterator
2828 I = InlineInfo.begin(), E = InlineInfo.end(); I != E; ++I) {
2829 GlobalVariable *GV = I->first;
2830 SmallVector<unsigned, 4> &Labels = I->second;
2831 DISubprogram SP(GV);
2835 SP.getLinkageName(LName);
2838 Asm->EmitString(LName.empty() ? Name : LName);
2839 Asm->EOL("MIPS linkage name");
2841 Asm->EmitString(Name); Asm->EOL("Function name");
2843 Asm->EmitULEB128Bytes(Labels.size()); Asm->EOL("Inline count");
2845 for (SmallVector<unsigned, 4>::iterator LI = Labels.begin(),
2846 LE = Labels.end(); LI != LE; ++LI) {
2847 DIE *SP = MainCU->getDieMapSlotFor(GV);
2848 Asm->EmitInt32(SP->getOffset()); Asm->EOL("DIE offset");
2850 if (TD->getPointerSize() == sizeof(int32_t))
2851 O << TAI->getData32bitsDirective();
2853 O << TAI->getData64bitsDirective();
2854 PrintLabelName("label", *LI); Asm->EOL("low_pc");
2858 EmitLabel("debug_inlined_end", 1);
2862 /// GetOrCreateSourceID - Look up the source id with the given directory and
2863 /// source file names. If none currently exists, create a new id and insert it
2864 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
2866 unsigned GetOrCreateSourceID(const std::string &DirName,
2867 const std::string &FileName) {
2869 StringMap<unsigned>::iterator DI = DirectoryIdMap.find(DirName);
2870 if (DI != DirectoryIdMap.end()) {
2871 DId = DI->getValue();
2873 DId = DirectoryNames.size() + 1;
2874 DirectoryIdMap[DirName] = DId;
2875 DirectoryNames.push_back(DirName);
2879 StringMap<unsigned>::iterator FI = SourceFileIdMap.find(FileName);
2880 if (FI != SourceFileIdMap.end()) {
2881 FId = FI->getValue();
2883 FId = SourceFileNames.size() + 1;
2884 SourceFileIdMap[FileName] = FId;
2885 SourceFileNames.push_back(FileName);
2888 DenseMap<std::pair<unsigned, unsigned>, unsigned>::iterator SI =
2889 SourceIdMap.find(std::make_pair(DId, FId));
2890 if (SI != SourceIdMap.end())
2893 unsigned SrcId = SourceIds.size() + 1; // DW_AT_decl_file cannot be 0.
2894 SourceIdMap[std::make_pair(DId, FId)] = SrcId;
2895 SourceIds.push_back(std::make_pair(DId, FId));
2900 void ConstructCompileUnit(GlobalVariable *GV) {
2901 DICompileUnit DIUnit(GV);
2902 std::string Dir, FN, Prod;
2903 unsigned ID = GetOrCreateSourceID(DIUnit.getDirectory(Dir),
2904 DIUnit.getFilename(FN));
2906 DIE *Die = new DIE(DW_TAG_compile_unit);
2907 AddSectionOffset(Die, DW_AT_stmt_list, DW_FORM_data4,
2908 DWLabel("section_line", 0), DWLabel("section_line", 0),
2910 AddString(Die, DW_AT_producer, DW_FORM_string, DIUnit.getProducer(Prod));
2911 AddUInt(Die, DW_AT_language, DW_FORM_data1, DIUnit.getLanguage());
2912 AddString(Die, DW_AT_name, DW_FORM_string, FN);
2914 AddString(Die, DW_AT_comp_dir, DW_FORM_string, Dir);
2915 if (DIUnit.isOptimized())
2916 AddUInt(Die, DW_AT_APPLE_optimized, DW_FORM_flag, 1);
2918 DIUnit.getFlags(Flags);
2920 AddString(Die, DW_AT_APPLE_flags, DW_FORM_string, Flags);
2921 unsigned RVer = DIUnit.getRunTimeVersion();
2923 AddUInt(Die, DW_AT_APPLE_major_runtime_vers, DW_FORM_data1, RVer);
2925 CompileUnit *Unit = new CompileUnit(ID, Die);
2926 if (DIUnit.isMain()) {
2927 assert(!MainCU && "Multiple main compile units are found!");
2930 CompileUnitMap[DIUnit.getGV()] = Unit;
2931 CompileUnits.push_back(Unit);
2934 /// ConstructCompileUnits - Create a compile unit DIEs.
2935 void ConstructCompileUnits() {
2936 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.compile_units");
2939 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
2940 "Malformed compile unit descriptor anchor type");
2941 Constant *RootC = cast<Constant>(*Root->use_begin());
2942 assert(RootC->hasNUsesOrMore(1) &&
2943 "Malformed compile unit descriptor anchor type");
2944 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
2946 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
2947 UUI != UUE; ++UUI) {
2948 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
2949 ConstructCompileUnit(GV);
2953 bool ConstructGlobalVariableDIE(GlobalVariable *GV) {
2954 DIGlobalVariable DI_GV(GV);
2955 CompileUnit *DW_Unit = MainCU;
2957 DW_Unit = FindCompileUnit(DI_GV.getCompileUnit());
2959 // Check for pre-existence.
2960 DIE *&Slot = DW_Unit->getDieMapSlotFor(DI_GV.getGV());
2964 DIE *VariableDie = CreateGlobalVariableDIE(DW_Unit, DI_GV);
2967 DIEBlock *Block = new DIEBlock();
2968 AddUInt(Block, 0, DW_FORM_data1, DW_OP_addr);
2970 AddObjectLabel(Block, 0, DW_FORM_udata,
2971 Asm->getGlobalLinkName(DI_GV.getGlobal(), GLN));
2972 AddBlock(VariableDie, DW_AT_location, 0, Block);
2976 // Add to context owner.
2977 DW_Unit->getDie()->AddChild(VariableDie);
2978 // Expose as global. FIXME - need to check external flag.
2980 DW_Unit->AddGlobal(DI_GV.getName(Name), VariableDie);
2984 /// ConstructGlobalVariableDIEs - Create DIEs for each of the externally
2985 /// visible global variables. Return true if at least one global DIE is
2987 bool ConstructGlobalVariableDIEs() {
2988 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.global_variables");
2992 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
2993 "Malformed global variable descriptor anchor type");
2994 Constant *RootC = cast<Constant>(*Root->use_begin());
2995 assert(RootC->hasNUsesOrMore(1) &&
2996 "Malformed global variable descriptor anchor type");
2998 bool Result = false;
2999 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
3001 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
3002 UUI != UUE; ++UUI) {
3003 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
3004 Result |= ConstructGlobalVariableDIE(GV);
3009 bool ConstructSubprogram(GlobalVariable *GV) {
3010 DISubprogram SP(GV);
3011 CompileUnit *Unit = MainCU;
3013 Unit = FindCompileUnit(SP.getCompileUnit());
3015 // Check for pre-existence.
3016 DIE *&Slot = Unit->getDieMapSlotFor(GV);
3020 if (!SP.isDefinition())
3021 // This is a method declaration which will be handled while
3022 // constructing class type.
3025 DIE *SubprogramDie = CreateSubprogramDIE(Unit, SP);
3028 Slot = SubprogramDie;
3029 // Add to context owner.
3030 Unit->getDie()->AddChild(SubprogramDie);
3031 // Expose as global.
3033 Unit->AddGlobal(SP.getName(Name), SubprogramDie);
3037 /// ConstructSubprograms - Create DIEs for each of the externally visible
3038 /// subprograms. Return true if at least one subprogram DIE is created.
3039 bool ConstructSubprograms() {
3040 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.subprograms");
3044 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
3045 "Malformed subprogram descriptor anchor type");
3046 Constant *RootC = cast<Constant>(*Root->use_begin());
3047 assert(RootC->hasNUsesOrMore(1) &&
3048 "Malformed subprogram descriptor anchor type");
3050 bool Result = false;
3051 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
3053 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
3054 UUI != UUE; ++UUI) {
3055 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
3056 Result |= ConstructSubprogram(GV);
3062 //===--------------------------------------------------------------------===//
3063 // Main entry points.
3065 DwarfDebug(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
3066 : Dwarf(OS, A, T, "dbg"), MainCU(0),
3067 AbbreviationsSet(InitAbbreviationsSetSize), Abbreviations(),
3068 ValuesSet(InitValuesSetSize), Values(), StringPool(), SectionMap(),
3069 SectionSourceLines(), didInitial(false), shouldEmit(false),
3070 RootDbgScope(0), DebugTimer(0) {
3071 if (TimePassesIsEnabled)
3072 DebugTimer = new Timer("Dwarf Debug Writer",
3073 getDwarfTimerGroup());
3075 virtual ~DwarfDebug() {
3076 for (unsigned j = 0, M = Values.size(); j < M; ++j)
3082 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
3084 bool ShouldEmitDwarfDebug() const { return shouldEmit; }
3086 /// SetDebugInfo - Create global DIEs and emit initial debug info sections.
3087 /// This is inovked by the target AsmPrinter.
3088 void SetDebugInfo(MachineModuleInfo *mmi) {
3089 if (TimePassesIsEnabled)
3090 DebugTimer->startTimer();
3092 // Create all the compile unit DIEs.
3093 ConstructCompileUnits();
3095 if (CompileUnits.empty()) {
3096 if (TimePassesIsEnabled)
3097 DebugTimer->stopTimer();
3102 // Create DIEs for each of the externally visible global variables.
3103 bool globalDIEs = ConstructGlobalVariableDIEs();
3105 // Create DIEs for each of the externally visible subprograms.
3106 bool subprogramDIEs = ConstructSubprograms();
3108 // If there is not any debug info available for any global variables
3109 // and any subprograms then there is not any debug info to emit.
3110 if (!globalDIEs && !subprogramDIEs) {
3111 if (TimePassesIsEnabled)
3112 DebugTimer->stopTimer();
3119 MMI->setDebugInfoAvailability(true);
3121 // Prime section data.
3122 SectionMap.insert(TAI->getTextSection());
3124 // Print out .file directives to specify files for .loc directives. These
3125 // are printed out early so that they precede any .loc directives.
3126 if (TAI->hasDotLocAndDotFile()) {
3127 for (unsigned i = 1, e = getNumSourceIds()+1; i != e; ++i) {
3128 // Remember source id starts at 1.
3129 std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(i);
3130 sys::Path FullPath(getSourceDirectoryName(Id.first));
3132 FullPath.appendComponent(getSourceFileName(Id.second));
3133 assert(AppendOk && "Could not append filename to directory!");
3135 Asm->EmitFile(i, FullPath.toString());
3140 // Emit initial sections
3143 if (TimePassesIsEnabled)
3144 DebugTimer->stopTimer();
3147 /// BeginModule - Emit all Dwarf sections that should come prior to the
3149 void BeginModule(Module *M) {
3153 /// EndModule - Emit all Dwarf sections that should come after the content.
3156 if (!ShouldEmitDwarfDebug())
3159 if (TimePassesIsEnabled)
3160 DebugTimer->startTimer();
3162 // Standard sections final addresses.
3163 Asm->SwitchToSection(TAI->getTextSection());
3164 EmitLabel("text_end", 0);
3165 Asm->SwitchToSection(TAI->getDataSection());
3166 EmitLabel("data_end", 0);
3168 // End text sections.
3169 for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
3170 Asm->SwitchToSection(SectionMap[i]);
3171 EmitLabel("section_end", i);
3174 // Emit common frame information.
3175 EmitCommonDebugFrame();
3177 // Emit function debug frame information
3178 for (std::vector<FunctionDebugFrameInfo>::iterator I = DebugFrames.begin(),
3179 E = DebugFrames.end(); I != E; ++I)
3180 EmitFunctionDebugFrame(*I);
3182 // Compute DIE offsets and sizes.
3185 // Emit all the DIEs into a debug info section
3188 // Corresponding abbreviations into a abbrev section.
3189 EmitAbbreviations();
3191 // Emit source line correspondence into a debug line section.
3194 // Emit info into a debug pubnames section.
3195 EmitDebugPubNames();
3197 // Emit info into a debug str section.
3200 // Emit info into a debug loc section.
3203 // Emit info into a debug aranges section.
3206 // Emit info into a debug ranges section.
3209 // Emit info into a debug macinfo section.
3212 // Emit inline info.
3213 EmitDebugInlineInfo();
3215 if (TimePassesIsEnabled)
3216 DebugTimer->stopTimer();
3219 /// BeginFunction - Gather pre-function debug information. Assumes being
3220 /// emitted immediately after the function entry point.
3221 void BeginFunction(MachineFunction *MF) {
3224 if (!ShouldEmitDwarfDebug()) return;
3226 if (TimePassesIsEnabled)
3227 DebugTimer->startTimer();
3229 // Begin accumulating function debug information.
3230 MMI->BeginFunction(MF);
3232 // Assumes in correct section after the entry point.
3233 EmitLabel("func_begin", ++SubprogramCount);
3235 // Emit label for the implicitly defined dbg.stoppoint at the start of
3237 if (!Lines.empty()) {
3238 const SrcLineInfo &LineInfo = Lines[0];
3239 Asm->printLabel(LineInfo.getLabelID());
3242 if (TimePassesIsEnabled)
3243 DebugTimer->stopTimer();
3246 /// EndFunction - Gather and emit post-function debug information.
3248 void EndFunction(MachineFunction *MF) {
3249 if (!ShouldEmitDwarfDebug()) return;
3251 if (TimePassesIsEnabled)
3252 DebugTimer->startTimer();
3254 // Define end label for subprogram.
3255 EmitLabel("func_end", SubprogramCount);
3257 // Get function line info.
3258 if (!Lines.empty()) {
3259 // Get section line info.
3260 unsigned ID = SectionMap.insert(Asm->CurrentSection_);
3261 if (SectionSourceLines.size() < ID) SectionSourceLines.resize(ID);
3262 std::vector<SrcLineInfo> &SectionLineInfos = SectionSourceLines[ID-1];
3263 // Append the function info to section info.
3264 SectionLineInfos.insert(SectionLineInfos.end(),
3265 Lines.begin(), Lines.end());
3268 // Construct scopes for subprogram.
3270 ConstructRootDbgScope(RootDbgScope);
3272 // FIXME: This is wrong. We are essentially getting past a problem with
3273 // debug information not being able to handle unreachable blocks that have
3274 // debug information in them. In particular, those unreachable blocks that
3275 // have "region end" info in them. That situation results in the "root
3276 // scope" not being created. If that's the case, then emit a "default"
3277 // scope, i.e., one that encompasses the whole function. This isn't
3278 // desirable. And a better way of handling this (and all of the debugging
3279 // information) needs to be explored.
3280 ConstructDefaultDbgScope(MF);
3282 DebugFrames.push_back(FunctionDebugFrameInfo(SubprogramCount,
3283 MMI->getFrameMoves()));
3287 delete RootDbgScope;
3288 DbgScopeMap.clear();
3289 RootDbgScope = NULL;
3294 if (TimePassesIsEnabled)
3295 DebugTimer->stopTimer();
3298 /// ValidDebugInfo - Return true if V represents valid debug info value.
3299 bool ValidDebugInfo(Value *V, bool FastISel) {
3306 GlobalVariable *GV = getGlobalVariable(V);
3310 if (!GV->hasInternalLinkage () && !GV->hasLinkOnceLinkage())
3313 if (TimePassesIsEnabled)
3314 DebugTimer->startTimer();
3316 DIDescriptor DI(GV);
3318 // Check current version. Allow Version6 for now.
3319 unsigned Version = DI.getVersion();
3320 if (Version != LLVMDebugVersion && Version != LLVMDebugVersion6) {
3321 if (TimePassesIsEnabled)
3322 DebugTimer->stopTimer();
3327 unsigned Tag = DI.getTag();
3329 case DW_TAG_variable:
3330 assert(DIVariable(GV).Verify() && "Invalid DebugInfo value");
3332 case DW_TAG_compile_unit:
3333 assert(DICompileUnit(GV).Verify() && "Invalid DebugInfo value");
3335 case DW_TAG_subprogram:
3336 assert(DISubprogram(GV).Verify() && "Invalid DebugInfo value");
3338 case DW_TAG_lexical_block:
3339 /// FIXME. This interfers with the qualitfy of generated code when
3340 /// during optimization.
3341 if (FastISel == false)
3347 if (TimePassesIsEnabled)
3348 DebugTimer->stopTimer();
3353 /// RecordSourceLine - Records location information and associates it with a
3354 /// label. Returns a unique label ID used to generate a label and provide
3355 /// correspondence to the source line list.
3356 unsigned RecordSourceLine(Value *V, unsigned Line, unsigned Col) {
3357 if (TimePassesIsEnabled)
3358 DebugTimer->startTimer();
3360 CompileUnit *Unit = CompileUnitMap[V];
3361 assert(Unit && "Unable to find CompileUnit");
3362 unsigned ID = MMI->NextLabelID();
3363 Lines.push_back(SrcLineInfo(Line, Col, Unit->getID(), ID));
3365 if (TimePassesIsEnabled)
3366 DebugTimer->stopTimer();
3371 /// RecordSourceLine - Records location information and associates it with a
3372 /// label. Returns a unique label ID used to generate a label and provide
3373 /// correspondence to the source line list.
3374 unsigned RecordSourceLine(unsigned Line, unsigned Col, unsigned Src) {
3375 if (TimePassesIsEnabled)
3376 DebugTimer->startTimer();
3378 unsigned ID = MMI->NextLabelID();
3379 Lines.push_back(SrcLineInfo(Line, Col, Src, ID));
3381 if (TimePassesIsEnabled)
3382 DebugTimer->stopTimer();
3387 /// getRecordSourceLineCount - Return the number of source lines in the debug
3389 unsigned getRecordSourceLineCount() const {
3390 return Lines.size();
3393 /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
3394 /// timed. Look up the source id with the given directory and source file
3395 /// names. If none currently exists, create a new id and insert it in the
3396 /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
3398 unsigned getOrCreateSourceID(const std::string &DirName,
3399 const std::string &FileName) {
3400 if (TimePassesIsEnabled)
3401 DebugTimer->startTimer();
3403 unsigned SrcId = GetOrCreateSourceID(DirName, FileName);
3405 if (TimePassesIsEnabled)
3406 DebugTimer->stopTimer();
3411 /// RecordRegionStart - Indicate the start of a region.
3412 unsigned RecordRegionStart(GlobalVariable *V) {
3413 if (TimePassesIsEnabled)
3414 DebugTimer->startTimer();
3416 DbgScope *Scope = getOrCreateScope(V);
3417 unsigned ID = MMI->NextLabelID();
3418 if (!Scope->getStartLabelID()) Scope->setStartLabelID(ID);
3420 if (TimePassesIsEnabled)
3421 DebugTimer->stopTimer();
3426 /// RecordRegionStart - Indicate the start of a region.
3427 unsigned RecordRegionStart(GlobalVariable *V, unsigned ID) {
3428 if (TimePassesIsEnabled)
3429 DebugTimer->startTimer();
3431 DbgScope *Scope = getOrCreateScope(V);
3432 if (!Scope->getStartLabelID()) Scope->setStartLabelID(ID);
3434 if (TimePassesIsEnabled)
3435 DebugTimer->stopTimer();
3440 /// RecordRegionEnd - Indicate the end of a region.
3441 unsigned RecordRegionEnd(GlobalVariable *V) {
3442 if (TimePassesIsEnabled)
3443 DebugTimer->startTimer();
3445 DbgScope *Scope = getOrCreateScope(V);
3446 unsigned ID = MMI->NextLabelID();
3447 Scope->setEndLabelID(ID);
3449 if (TimePassesIsEnabled)
3450 DebugTimer->stopTimer();
3455 /// RecordVariable - Indicate the declaration of a local variable.
3456 void RecordVariable(GlobalVariable *GV, unsigned FrameIndex) {
3457 if (TimePassesIsEnabled)
3458 DebugTimer->startTimer();
3460 DIDescriptor Desc(GV);
3461 DbgScope *Scope = NULL;
3463 if (Desc.getTag() == DW_TAG_variable) {
3464 // GV is a global variable.
3465 DIGlobalVariable DG(GV);
3466 Scope = getOrCreateScope(DG.getContext().getGV());
3468 // or GV is a local variable.
3470 Scope = getOrCreateScope(DV.getContext().getGV());
3473 assert(Scope && "Unable to find variable' scope");
3474 DbgVariable *DV = new DbgVariable(DIVariable(GV), FrameIndex);
3475 Scope->AddVariable(DV);
3477 if (TimePassesIsEnabled)
3478 DebugTimer->stopTimer();
3481 //// RecordInlineInfo - Global variable GV is inlined at the location marked
3482 //// by LabelID label.
3483 void RecordInlineInfo(GlobalVariable *GV, unsigned LabelID) {
3484 MMI->RecordUsedDbgLabel(LabelID);
3485 DenseMap<GlobalVariable *, SmallVector<unsigned, 4> >::iterator
3486 I = InlineInfo.find(GV);
3487 if (I == InlineInfo.end()) {
3488 SmallVector<unsigned, 4> Labels;
3489 Labels.push_back(LabelID);
3490 InlineInfo[GV] = Labels;
3494 SmallVector<unsigned, 4> &Labels = I->second;
3495 Labels.push_back(LabelID);
3499 //===----------------------------------------------------------------------===//
3500 /// DwarfException - Emits Dwarf exception handling directives.
3502 class DwarfException : public Dwarf {
3503 struct FunctionEHFrameInfo {
3506 unsigned PersonalityIndex;
3508 bool hasLandingPads;
3509 std::vector<MachineMove> Moves;
3510 const Function * function;
3512 FunctionEHFrameInfo(const std::string &FN, unsigned Num, unsigned P,
3514 const std::vector<MachineMove> &M,
3516 FnName(FN), Number(Num), PersonalityIndex(P),
3517 hasCalls(hC), hasLandingPads(hL), Moves(M), function (f) { }
3520 std::vector<FunctionEHFrameInfo> EHFrames;
3522 /// shouldEmitTable - Per-function flag to indicate if EH tables should
3524 bool shouldEmitTable;
3526 /// shouldEmitMoves - Per-function flag to indicate if frame moves info
3527 /// should be emitted.
3528 bool shouldEmitMoves;
3530 /// shouldEmitTableModule - Per-module flag to indicate if EH tables
3531 /// should be emitted.
3532 bool shouldEmitTableModule;
3534 /// shouldEmitFrameModule - Per-module flag to indicate if frame moves
3535 /// should be emitted.
3536 bool shouldEmitMovesModule;
3538 /// ExceptionTimer - Timer for the Dwarf exception writer.
3539 Timer *ExceptionTimer;
3541 /// EmitCommonEHFrame - Emit the common eh unwind frame.
3543 void EmitCommonEHFrame(const Function *Personality, unsigned Index) {
3544 // Size and sign of stack growth.
3546 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
3547 TargetFrameInfo::StackGrowsUp ?
3548 TD->getPointerSize() : -TD->getPointerSize();
3550 // Begin eh frame section.
3551 Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
3553 if (!TAI->doesRequireNonLocalEHFrameLabel())
3554 O << TAI->getEHGlobalPrefix();
3555 O << "EH_frame" << Index << ":\n";
3556 EmitLabel("section_eh_frame", Index);
3558 // Define base labels.
3559 EmitLabel("eh_frame_common", Index);
3561 // Define the eh frame length.
3562 EmitDifference("eh_frame_common_end", Index,
3563 "eh_frame_common_begin", Index, true);
3564 Asm->EOL("Length of Common Information Entry");
3567 EmitLabel("eh_frame_common_begin", Index);
3568 Asm->EmitInt32((int)0);
3569 Asm->EOL("CIE Identifier Tag");
3570 Asm->EmitInt8(DW_CIE_VERSION);
3571 Asm->EOL("CIE Version");
3573 // The personality presence indicates that language specific information
3574 // will show up in the eh frame.
3575 Asm->EmitString(Personality ? "zPLR" : "zR");
3576 Asm->EOL("CIE Augmentation");
3578 // Round out reader.
3579 Asm->EmitULEB128Bytes(1);
3580 Asm->EOL("CIE Code Alignment Factor");
3581 Asm->EmitSLEB128Bytes(stackGrowth);
3582 Asm->EOL("CIE Data Alignment Factor");
3583 Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true));
3584 Asm->EOL("CIE Return Address Column");
3586 // If there is a personality, we need to indicate the functions location.
3588 Asm->EmitULEB128Bytes(7);
3589 Asm->EOL("Augmentation Size");
3591 if (TAI->getNeedsIndirectEncoding()) {
3592 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect);
3593 Asm->EOL("Personality (pcrel sdata4 indirect)");
3595 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3596 Asm->EOL("Personality (pcrel sdata4)");
3599 PrintRelDirective(true);
3600 O << TAI->getPersonalityPrefix();
3601 Asm->EmitExternalGlobal((const GlobalVariable *)(Personality));
3602 O << TAI->getPersonalitySuffix();
3603 if (strcmp(TAI->getPersonalitySuffix(), "+4@GOTPCREL"))
3604 O << "-" << TAI->getPCSymbol();
3605 Asm->EOL("Personality");
3607 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3608 Asm->EOL("LSDA Encoding (pcrel sdata4)");
3610 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3611 Asm->EOL("FDE Encoding (pcrel sdata4)");
3613 Asm->EmitULEB128Bytes(1);
3614 Asm->EOL("Augmentation Size");
3616 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3617 Asm->EOL("FDE Encoding (pcrel sdata4)");
3620 // Indicate locations of general callee saved registers in frame.
3621 std::vector<MachineMove> Moves;
3622 RI->getInitialFrameState(Moves);
3623 EmitFrameMoves(NULL, 0, Moves, true);
3625 // On Darwin the linker honors the alignment of eh_frame, which means it
3626 // must be 8-byte on 64-bit targets to match what gcc does. Otherwise
3627 // you get holes which confuse readers of eh_frame.
3628 Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
3630 EmitLabel("eh_frame_common_end", Index);
3635 /// EmitEHFrame - Emit function exception frame information.
3637 void EmitEHFrame(const FunctionEHFrameInfo &EHFrameInfo) {
3638 Function::LinkageTypes linkage = EHFrameInfo.function->getLinkage();
3640 assert(!EHFrameInfo.function->hasAvailableExternallyLinkage() &&
3641 "Should not emit 'available externally' functions at all");
3643 Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
3645 // Externally visible entry into the functions eh frame info.
3646 // If the corresponding function is static, this should not be
3647 // externally visible.
3648 if (linkage != Function::InternalLinkage &&
3649 linkage != Function::PrivateLinkage) {
3650 if (const char *GlobalEHDirective = TAI->getGlobalEHDirective())
3651 O << GlobalEHDirective << EHFrameInfo.FnName << "\n";
3654 // If corresponding function is weak definition, this should be too.
3655 if ((linkage == Function::WeakAnyLinkage ||
3656 linkage == Function::WeakODRLinkage ||
3657 linkage == Function::LinkOnceAnyLinkage ||
3658 linkage == Function::LinkOnceODRLinkage) &&
3659 TAI->getWeakDefDirective())
3660 O << TAI->getWeakDefDirective() << EHFrameInfo.FnName << "\n";
3662 // If there are no calls then you can't unwind. This may mean we can
3663 // omit the EH Frame, but some environments do not handle weak absolute
3665 // If UnwindTablesMandatory is set we cannot do this optimization; the
3666 // unwind info is to be available for non-EH uses.
3667 if (!EHFrameInfo.hasCalls &&
3668 !UnwindTablesMandatory &&
3669 ((linkage != Function::WeakAnyLinkage &&
3670 linkage != Function::WeakODRLinkage &&
3671 linkage != Function::LinkOnceAnyLinkage &&
3672 linkage != Function::LinkOnceODRLinkage) ||
3673 !TAI->getWeakDefDirective() ||
3674 TAI->getSupportsWeakOmittedEHFrame()))
3676 O << EHFrameInfo.FnName << " = 0\n";
3677 // This name has no connection to the function, so it might get
3678 // dead-stripped when the function is not, erroneously. Prohibit
3679 // dead-stripping unconditionally.
3680 if (const char *UsedDirective = TAI->getUsedDirective())
3681 O << UsedDirective << EHFrameInfo.FnName << "\n\n";
3683 O << EHFrameInfo.FnName << ":\n";
3686 EmitDifference("eh_frame_end", EHFrameInfo.Number,
3687 "eh_frame_begin", EHFrameInfo.Number, true);
3688 Asm->EOL("Length of Frame Information Entry");
3690 EmitLabel("eh_frame_begin", EHFrameInfo.Number);
3692 if (TAI->doesRequireNonLocalEHFrameLabel()) {
3693 PrintRelDirective(true, true);
3694 PrintLabelName("eh_frame_begin", EHFrameInfo.Number);
3696 if (!TAI->isAbsoluteEHSectionOffsets())
3697 O << "-EH_frame" << EHFrameInfo.PersonalityIndex;
3699 EmitSectionOffset("eh_frame_begin", "eh_frame_common",
3700 EHFrameInfo.Number, EHFrameInfo.PersonalityIndex,
3704 Asm->EOL("FDE CIE offset");
3706 EmitReference("eh_func_begin", EHFrameInfo.Number, true, true);
3707 Asm->EOL("FDE initial location");
3708 EmitDifference("eh_func_end", EHFrameInfo.Number,
3709 "eh_func_begin", EHFrameInfo.Number, true);
3710 Asm->EOL("FDE address range");
3712 // If there is a personality and landing pads then point to the language
3713 // specific data area in the exception table.
3714 if (EHFrameInfo.PersonalityIndex) {
3715 Asm->EmitULEB128Bytes(4);
3716 Asm->EOL("Augmentation size");
3718 if (EHFrameInfo.hasLandingPads)
3719 EmitReference("exception", EHFrameInfo.Number, true, true);
3721 Asm->EmitInt32((int)0);
3722 Asm->EOL("Language Specific Data Area");
3724 Asm->EmitULEB128Bytes(0);
3725 Asm->EOL("Augmentation size");
3728 // Indicate locations of function specific callee saved registers in
3730 EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves,
3733 // On Darwin the linker honors the alignment of eh_frame, which means it
3734 // must be 8-byte on 64-bit targets to match what gcc does. Otherwise
3735 // you get holes which confuse readers of eh_frame.
3736 Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
3738 EmitLabel("eh_frame_end", EHFrameInfo.Number);
3740 // If the function is marked used, this table should be also. We cannot
3741 // make the mark unconditional in this case, since retaining the table
3742 // also retains the function in this case, and there is code around
3743 // that depends on unused functions (calling undefined externals) being
3744 // dead-stripped to link correctly. Yes, there really is.
3745 if (MMI->getUsedFunctions().count(EHFrameInfo.function))
3746 if (const char *UsedDirective = TAI->getUsedDirective())
3747 O << UsedDirective << EHFrameInfo.FnName << "\n\n";
3751 /// EmitExceptionTable - Emit landing pads and actions.
3753 /// The general organization of the table is complex, but the basic concepts
3754 /// are easy. First there is a header which describes the location and
3755 /// organization of the three components that follow.
3756 /// 1. The landing pad site information describes the range of code covered
3757 /// by the try. In our case it's an accumulation of the ranges covered
3758 /// by the invokes in the try. There is also a reference to the landing
3759 /// pad that handles the exception once processed. Finally an index into
3760 /// the actions table.
3761 /// 2. The action table, in our case, is composed of pairs of type ids
3762 /// and next action offset. Starting with the action index from the
3763 /// landing pad site, each type Id is checked for a match to the current
3764 /// exception. If it matches then the exception and type id are passed
3765 /// on to the landing pad. Otherwise the next action is looked up. This
3766 /// chain is terminated with a next action of zero. If no type id is
3767 /// found the the frame is unwound and handling continues.
3768 /// 3. Type id table contains references to all the C++ typeinfo for all
3769 /// catches in the function. This tables is reversed indexed base 1.
3771 /// SharedTypeIds - How many leading type ids two landing pads have in common.
3772 static unsigned SharedTypeIds(const LandingPadInfo *L,
3773 const LandingPadInfo *R) {
3774 const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
3775 unsigned LSize = LIds.size(), RSize = RIds.size();
3776 unsigned MinSize = LSize < RSize ? LSize : RSize;
3779 for (; Count != MinSize; ++Count)
3780 if (LIds[Count] != RIds[Count])
3786 /// PadLT - Order landing pads lexicographically by type id.
3787 static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R) {
3788 const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
3789 unsigned LSize = LIds.size(), RSize = RIds.size();
3790 unsigned MinSize = LSize < RSize ? LSize : RSize;
3792 for (unsigned i = 0; i != MinSize; ++i)
3793 if (LIds[i] != RIds[i])
3794 return LIds[i] < RIds[i];
3796 return LSize < RSize;
3800 static inline unsigned getEmptyKey() { return -1U; }
3801 static inline unsigned getTombstoneKey() { return -2U; }
3802 static unsigned getHashValue(const unsigned &Key) { return Key; }
3803 static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
3804 static bool isPod() { return true; }
3807 /// ActionEntry - Structure describing an entry in the actions table.
3808 struct ActionEntry {
3809 int ValueForTypeID; // The value to write - may not be equal to the type id.
3811 struct ActionEntry *Previous;
3814 /// PadRange - Structure holding a try-range and the associated landing pad.
3816 // The index of the landing pad.
3818 // The index of the begin and end labels in the landing pad's label lists.
3819 unsigned RangeIndex;
3822 typedef DenseMap<unsigned, PadRange, KeyInfo> RangeMapType;
3824 /// CallSiteEntry - Structure describing an entry in the call-site table.
3825 struct CallSiteEntry {
3826 // The 'try-range' is BeginLabel .. EndLabel.
3827 unsigned BeginLabel; // zero indicates the start of the function.
3828 unsigned EndLabel; // zero indicates the end of the function.
3829 // The landing pad starts at PadLabel.
3830 unsigned PadLabel; // zero indicates that there is no landing pad.
3834 void EmitExceptionTable() {
3835 const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
3836 const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
3837 const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
3838 if (PadInfos.empty()) return;
3840 // Sort the landing pads in order of their type ids. This is used to fold
3841 // duplicate actions.
3842 SmallVector<const LandingPadInfo *, 64> LandingPads;
3843 LandingPads.reserve(PadInfos.size());
3844 for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
3845 LandingPads.push_back(&PadInfos[i]);
3846 std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
3848 // Negative type ids index into FilterIds, positive type ids index into
3849 // TypeInfos. The value written for a positive type id is just the type
3850 // id itself. For a negative type id, however, the value written is the
3851 // (negative) byte offset of the corresponding FilterIds entry. The byte
3852 // offset is usually equal to the type id, because the FilterIds entries
3853 // are written using a variable width encoding which outputs one byte per
3854 // entry as long as the value written is not too large, but can differ.
3855 // This kind of complication does not occur for positive type ids because
3856 // type infos are output using a fixed width encoding.
3857 // FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
3858 SmallVector<int, 16> FilterOffsets;
3859 FilterOffsets.reserve(FilterIds.size());
3861 for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
3862 E = FilterIds.end(); I != E; ++I) {
3863 FilterOffsets.push_back(Offset);
3864 Offset -= TargetAsmInfo::getULEB128Size(*I);
3867 // Compute the actions table and gather the first action index for each
3868 // landing pad site.
3869 SmallVector<ActionEntry, 32> Actions;
3870 SmallVector<unsigned, 64> FirstActions;
3871 FirstActions.reserve(LandingPads.size());
3873 int FirstAction = 0;
3874 unsigned SizeActions = 0;
3875 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
3876 const LandingPadInfo *LP = LandingPads[i];
3877 const std::vector<int> &TypeIds = LP->TypeIds;
3878 const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
3879 unsigned SizeSiteActions = 0;
3881 if (NumShared < TypeIds.size()) {
3882 unsigned SizeAction = 0;
3883 ActionEntry *PrevAction = 0;
3886 const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
3887 assert(Actions.size());
3888 PrevAction = &Actions.back();
3889 SizeAction = TargetAsmInfo::getSLEB128Size(PrevAction->NextAction) +
3890 TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
3891 for (unsigned j = NumShared; j != SizePrevIds; ++j) {
3893 TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
3894 SizeAction += -PrevAction->NextAction;
3895 PrevAction = PrevAction->Previous;
3899 // Compute the actions.
3900 for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
3901 int TypeID = TypeIds[I];
3902 assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
3903 int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
3904 unsigned SizeTypeID = TargetAsmInfo::getSLEB128Size(ValueForTypeID);
3906 int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
3907 SizeAction = SizeTypeID + TargetAsmInfo::getSLEB128Size(NextAction);
3908 SizeSiteActions += SizeAction;
3910 ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
3911 Actions.push_back(Action);
3913 PrevAction = &Actions.back();
3916 // Record the first action of the landing pad site.
3917 FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
3918 } // else identical - re-use previous FirstAction
3920 FirstActions.push_back(FirstAction);
3922 // Compute this sites contribution to size.
3923 SizeActions += SizeSiteActions;
3926 // Compute the call-site table. The entry for an invoke has a try-range
3927 // containing the call, a non-zero landing pad and an appropriate action.
3928 // The entry for an ordinary call has a try-range containing the call and
3929 // zero for the landing pad and the action. Calls marked 'nounwind' have
3930 // no entry and must not be contained in the try-range of any entry - they
3931 // form gaps in the table. Entries must be ordered by try-range address.
3932 SmallVector<CallSiteEntry, 64> CallSites;
3934 RangeMapType PadMap;
3935 // Invokes and nounwind calls have entries in PadMap (due to being bracketed
3936 // by try-range labels when lowered). Ordinary calls do not, so appropriate
3937 // try-ranges for them need be deduced.
3938 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
3939 const LandingPadInfo *LandingPad = LandingPads[i];
3940 for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
3941 unsigned BeginLabel = LandingPad->BeginLabels[j];
3942 assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
3943 PadRange P = { i, j };
3944 PadMap[BeginLabel] = P;
3948 // The end label of the previous invoke or nounwind try-range.
3949 unsigned LastLabel = 0;
3951 // Whether there is a potentially throwing instruction (currently this means
3952 // an ordinary call) between the end of the previous try-range and now.
3953 bool SawPotentiallyThrowing = false;
3955 // Whether the last callsite entry was for an invoke.
3956 bool PreviousIsInvoke = false;
3958 // Visit all instructions in order of address.
3959 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
3961 for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
3963 if (!MI->isLabel()) {
3964 SawPotentiallyThrowing |= MI->getDesc().isCall();
3968 unsigned BeginLabel = MI->getOperand(0).getImm();
3969 assert(BeginLabel && "Invalid label!");
3971 // End of the previous try-range?
3972 if (BeginLabel == LastLabel)
3973 SawPotentiallyThrowing = false;
3975 // Beginning of a new try-range?
3976 RangeMapType::iterator L = PadMap.find(BeginLabel);
3977 if (L == PadMap.end())
3978 // Nope, it was just some random label.
3981 PadRange P = L->second;
3982 const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
3984 assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
3985 "Inconsistent landing pad map!");
3987 // If some instruction between the previous try-range and this one may
3988 // throw, create a call-site entry with no landing pad for the region
3989 // between the try-ranges.
3990 if (SawPotentiallyThrowing) {
3991 CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
3992 CallSites.push_back(Site);
3993 PreviousIsInvoke = false;
3996 LastLabel = LandingPad->EndLabels[P.RangeIndex];
3997 assert(BeginLabel && LastLabel && "Invalid landing pad!");
3999 if (LandingPad->LandingPadLabel) {
4000 // This try-range is for an invoke.
4001 CallSiteEntry Site = {BeginLabel, LastLabel,
4002 LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
4004 // Try to merge with the previous call-site.
4005 if (PreviousIsInvoke) {
4006 CallSiteEntry &Prev = CallSites.back();
4007 if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
4008 // Extend the range of the previous entry.
4009 Prev.EndLabel = Site.EndLabel;
4014 // Otherwise, create a new call-site.
4015 CallSites.push_back(Site);
4016 PreviousIsInvoke = true;
4019 PreviousIsInvoke = false;
4023 // If some instruction between the previous try-range and the end of the
4024 // function may throw, create a call-site entry with no landing pad for the
4025 // region following the try-range.
4026 if (SawPotentiallyThrowing) {
4027 CallSiteEntry Site = {LastLabel, 0, 0, 0};
4028 CallSites.push_back(Site);
4034 const unsigned SiteStartSize = sizeof(int32_t); // DW_EH_PE_udata4
4035 const unsigned SiteLengthSize = sizeof(int32_t); // DW_EH_PE_udata4
4036 const unsigned LandingPadSize = sizeof(int32_t); // DW_EH_PE_udata4
4037 unsigned SizeSites = CallSites.size() * (SiteStartSize +
4040 for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
4041 SizeSites += TargetAsmInfo::getULEB128Size(CallSites[i].Action);
4044 const unsigned TypeInfoSize = TD->getPointerSize(); // DW_EH_PE_absptr
4045 unsigned SizeTypes = TypeInfos.size() * TypeInfoSize;
4047 unsigned TypeOffset = sizeof(int8_t) + // Call site format
4048 TargetAsmInfo::getULEB128Size(SizeSites) + // Call-site table length
4049 SizeSites + SizeActions + SizeTypes;
4051 unsigned TotalSize = sizeof(int8_t) + // LPStart format
4052 sizeof(int8_t) + // TType format
4053 TargetAsmInfo::getULEB128Size(TypeOffset) + // TType base offset
4056 unsigned SizeAlign = (4 - TotalSize) & 3;
4058 // Begin the exception table.
4059 Asm->SwitchToDataSection(TAI->getDwarfExceptionSection());
4060 Asm->EmitAlignment(2, 0, 0, false);
4061 O << "GCC_except_table" << SubprogramCount << ":\n";
4062 for (unsigned i = 0; i != SizeAlign; ++i) {
4064 Asm->EOL("Padding");
4066 EmitLabel("exception", SubprogramCount);
4069 Asm->EmitInt8(DW_EH_PE_omit);
4070 Asm->EOL("LPStart format (DW_EH_PE_omit)");
4071 Asm->EmitInt8(DW_EH_PE_absptr);
4072 Asm->EOL("TType format (DW_EH_PE_absptr)");
4073 Asm->EmitULEB128Bytes(TypeOffset);
4074 Asm->EOL("TType base offset");
4075 Asm->EmitInt8(DW_EH_PE_udata4);
4076 Asm->EOL("Call site format (DW_EH_PE_udata4)");
4077 Asm->EmitULEB128Bytes(SizeSites);
4078 Asm->EOL("Call-site table length");
4080 // Emit the landing pad site information.
4081 for (unsigned i = 0; i < CallSites.size(); ++i) {
4082 CallSiteEntry &S = CallSites[i];
4083 const char *BeginTag;
4084 unsigned BeginNumber;
4086 if (!S.BeginLabel) {
4087 BeginTag = "eh_func_begin";
4088 BeginNumber = SubprogramCount;
4091 BeginNumber = S.BeginLabel;
4094 EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount,
4096 Asm->EOL("Region start");
4099 EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber,
4102 EmitDifference("label", S.EndLabel, BeginTag, BeginNumber, true);
4104 Asm->EOL("Region length");
4109 EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount,
4111 Asm->EOL("Landing pad");
4113 Asm->EmitULEB128Bytes(S.Action);
4117 // Emit the actions.
4118 for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
4119 ActionEntry &Action = Actions[I];
4121 Asm->EmitSLEB128Bytes(Action.ValueForTypeID);
4122 Asm->EOL("TypeInfo index");
4123 Asm->EmitSLEB128Bytes(Action.NextAction);
4124 Asm->EOL("Next action");
4127 // Emit the type ids.
4128 for (unsigned M = TypeInfos.size(); M; --M) {
4129 GlobalVariable *GV = TypeInfos[M - 1];
4131 PrintRelDirective();
4135 O << Asm->getGlobalLinkName(GV, GLN);
4140 Asm->EOL("TypeInfo");
4143 // Emit the filter typeids.
4144 for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
4145 unsigned TypeID = FilterIds[j];
4146 Asm->EmitULEB128Bytes(TypeID);
4147 Asm->EOL("Filter TypeInfo index");
4150 Asm->EmitAlignment(2, 0, 0, false);
4154 //===--------------------------------------------------------------------===//
4155 // Main entry points.
4157 DwarfException(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
4158 : Dwarf(OS, A, T, "eh"), shouldEmitTable(false), shouldEmitMoves(false),
4159 shouldEmitTableModule(false), shouldEmitMovesModule(false),
4161 if (TimePassesIsEnabled)
4162 ExceptionTimer = new Timer("Dwarf Exception Writer",
4163 getDwarfTimerGroup());
4166 virtual ~DwarfException() {
4167 delete ExceptionTimer;
4170 /// SetModuleInfo - Set machine module information when it's known that pass
4171 /// manager has created it. Set by the target AsmPrinter.
4172 void SetModuleInfo(MachineModuleInfo *mmi) {
4176 /// BeginModule - Emit all exception information that should come prior to the
4178 void BeginModule(Module *M) {
4182 /// EndModule - Emit all exception information that should come after the
4185 if (TimePassesIsEnabled)
4186 ExceptionTimer->startTimer();
4188 if (shouldEmitMovesModule || shouldEmitTableModule) {
4189 const std::vector<Function *> Personalities = MMI->getPersonalities();
4190 for (unsigned i = 0; i < Personalities.size(); ++i)
4191 EmitCommonEHFrame(Personalities[i], i);
4193 for (std::vector<FunctionEHFrameInfo>::iterator I = EHFrames.begin(),
4194 E = EHFrames.end(); I != E; ++I)
4198 if (TimePassesIsEnabled)
4199 ExceptionTimer->stopTimer();
4202 /// BeginFunction - Gather pre-function exception information. Assumes being
4203 /// emitted immediately after the function entry point.
4204 void BeginFunction(MachineFunction *MF) {
4205 if (TimePassesIsEnabled)
4206 ExceptionTimer->startTimer();
4209 shouldEmitTable = shouldEmitMoves = false;
4211 if (MMI && TAI->doesSupportExceptionHandling()) {
4212 // Map all labels and get rid of any dead landing pads.
4213 MMI->TidyLandingPads();
4215 // If any landing pads survive, we need an EH table.
4216 if (MMI->getLandingPads().size())
4217 shouldEmitTable = true;
4219 // See if we need frame move info.
4220 if (!MF->getFunction()->doesNotThrow() || UnwindTablesMandatory)
4221 shouldEmitMoves = true;
4223 if (shouldEmitMoves || shouldEmitTable)
4224 // Assumes in correct section after the entry point.
4225 EmitLabel("eh_func_begin", ++SubprogramCount);
4228 shouldEmitTableModule |= shouldEmitTable;
4229 shouldEmitMovesModule |= shouldEmitMoves;
4231 if (TimePassesIsEnabled)
4232 ExceptionTimer->stopTimer();
4235 /// EndFunction - Gather and emit post-function exception information.
4237 void EndFunction() {
4238 if (TimePassesIsEnabled)
4239 ExceptionTimer->startTimer();
4241 if (shouldEmitMoves || shouldEmitTable) {
4242 EmitLabel("eh_func_end", SubprogramCount);
4243 EmitExceptionTable();
4245 // Save EH frame information
4248 FunctionEHFrameInfo(getAsm()->getCurrentFunctionEHName(MF, Name),
4250 MMI->getPersonalityIndex(),
4251 MF->getFrameInfo()->hasCalls(),
4252 !MMI->getLandingPads().empty(),
4253 MMI->getFrameMoves(),
4254 MF->getFunction()));
4257 if (TimePassesIsEnabled)
4258 ExceptionTimer->stopTimer();
4262 } // End of namespace llvm
4264 //===----------------------------------------------------------------------===//
4266 /// Emit - Print the abbreviation using the specified Dwarf writer.
4268 void DIEAbbrev::Emit(const DwarfDebug &DD) const {
4269 // Emit its Dwarf tag type.
4270 DD.getAsm()->EmitULEB128Bytes(Tag);
4271 DD.getAsm()->EOL(TagString(Tag));
4273 // Emit whether it has children DIEs.
4274 DD.getAsm()->EmitULEB128Bytes(ChildrenFlag);
4275 DD.getAsm()->EOL(ChildrenString(ChildrenFlag));
4277 // For each attribute description.
4278 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4279 const DIEAbbrevData &AttrData = Data[i];
4281 // Emit attribute type.
4282 DD.getAsm()->EmitULEB128Bytes(AttrData.getAttribute());
4283 DD.getAsm()->EOL(AttributeString(AttrData.getAttribute()));
4286 DD.getAsm()->EmitULEB128Bytes(AttrData.getForm());
4287 DD.getAsm()->EOL(FormEncodingString(AttrData.getForm()));
4290 // Mark end of abbreviation.
4291 DD.getAsm()->EmitULEB128Bytes(0); DD.getAsm()->EOL("EOM(1)");
4292 DD.getAsm()->EmitULEB128Bytes(0); DD.getAsm()->EOL("EOM(2)");
4296 void DIEAbbrev::print(std::ostream &O) {
4297 O << "Abbreviation @"
4298 << std::hex << (intptr_t)this << std::dec
4302 << ChildrenString(ChildrenFlag)
4305 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4307 << AttributeString(Data[i].getAttribute())
4309 << FormEncodingString(Data[i].getForm())
4313 void DIEAbbrev::dump() { print(cerr); }
4316 //===----------------------------------------------------------------------===//
4319 void DIEValue::dump() {
4324 //===----------------------------------------------------------------------===//
4326 /// EmitValue - Emit integer of appropriate size.
4328 void DIEInteger::EmitValue(DwarfDebug &DD, unsigned Form) {
4330 case DW_FORM_flag: // Fall thru
4331 case DW_FORM_ref1: // Fall thru
4332 case DW_FORM_data1: DD.getAsm()->EmitInt8(Integer); break;
4333 case DW_FORM_ref2: // Fall thru
4334 case DW_FORM_data2: DD.getAsm()->EmitInt16(Integer); break;
4335 case DW_FORM_ref4: // Fall thru
4336 case DW_FORM_data4: DD.getAsm()->EmitInt32(Integer); break;
4337 case DW_FORM_ref8: // Fall thru
4338 case DW_FORM_data8: DD.getAsm()->EmitInt64(Integer); break;
4339 case DW_FORM_udata: DD.getAsm()->EmitULEB128Bytes(Integer); break;
4340 case DW_FORM_sdata: DD.getAsm()->EmitSLEB128Bytes(Integer); break;
4341 default: assert(0 && "DIE Value form not supported yet"); break;
4345 /// SizeOf - Determine size of integer value in bytes.
4347 unsigned DIEInteger::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4349 case DW_FORM_flag: // Fall thru
4350 case DW_FORM_ref1: // Fall thru
4351 case DW_FORM_data1: return sizeof(int8_t);
4352 case DW_FORM_ref2: // Fall thru
4353 case DW_FORM_data2: return sizeof(int16_t);
4354 case DW_FORM_ref4: // Fall thru
4355 case DW_FORM_data4: return sizeof(int32_t);
4356 case DW_FORM_ref8: // Fall thru
4357 case DW_FORM_data8: return sizeof(int64_t);
4358 case DW_FORM_udata: return TargetAsmInfo::getULEB128Size(Integer);
4359 case DW_FORM_sdata: return TargetAsmInfo::getSLEB128Size(Integer);
4360 default: assert(0 && "DIE Value form not supported yet"); break;
4365 //===----------------------------------------------------------------------===//
4367 /// EmitValue - Emit string value.
4369 void DIEString::EmitValue(DwarfDebug &DD, unsigned Form) {
4370 DD.getAsm()->EmitString(Str);
4373 //===----------------------------------------------------------------------===//
4375 /// EmitValue - Emit label value.
4377 void DIEDwarfLabel::EmitValue(DwarfDebug &DD, unsigned Form) {
4378 bool IsSmall = Form == DW_FORM_data4;
4379 DD.EmitReference(Label, false, IsSmall);
4382 /// SizeOf - Determine size of label value in bytes.
4384 unsigned DIEDwarfLabel::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4385 if (Form == DW_FORM_data4) return 4;
4386 return DD.getTargetData()->getPointerSize();
4389 //===----------------------------------------------------------------------===//
4391 /// EmitValue - Emit label value.
4393 void DIEObjectLabel::EmitValue(DwarfDebug &DD, unsigned Form) {
4394 bool IsSmall = Form == DW_FORM_data4;
4395 DD.EmitReference(Label, false, IsSmall);
4398 /// SizeOf - Determine size of label value in bytes.
4400 unsigned DIEObjectLabel::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4401 if (Form == DW_FORM_data4) return 4;
4402 return DD.getTargetData()->getPointerSize();
4405 //===----------------------------------------------------------------------===//
4407 /// EmitValue - Emit delta value.
4409 void DIESectionOffset::EmitValue(DwarfDebug &DD, unsigned Form) {
4410 bool IsSmall = Form == DW_FORM_data4;
4411 DD.EmitSectionOffset(Label.Tag, Section.Tag,
4412 Label.Number, Section.Number, IsSmall, IsEH, UseSet);
4415 /// SizeOf - Determine size of delta value in bytes.
4417 unsigned DIESectionOffset::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4418 if (Form == DW_FORM_data4) return 4;
4419 return DD.getTargetData()->getPointerSize();
4422 //===----------------------------------------------------------------------===//
4424 /// EmitValue - Emit delta value.
4426 void DIEDelta::EmitValue(DwarfDebug &DD, unsigned Form) {
4427 bool IsSmall = Form == DW_FORM_data4;
4428 DD.EmitDifference(LabelHi, LabelLo, IsSmall);
4431 /// SizeOf - Determine size of delta value in bytes.
4433 unsigned DIEDelta::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4434 if (Form == DW_FORM_data4) return 4;
4435 return DD.getTargetData()->getPointerSize();
4438 //===----------------------------------------------------------------------===//
4440 /// EmitValue - Emit debug information entry offset.
4442 void DIEntry::EmitValue(DwarfDebug &DD, unsigned Form) {
4443 DD.getAsm()->EmitInt32(Entry->getOffset());
4446 //===----------------------------------------------------------------------===//
4448 /// ComputeSize - calculate the size of the block.
4450 unsigned DIEBlock::ComputeSize(DwarfDebug &DD) {
4452 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
4454 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
4455 Size += Values[i]->SizeOf(DD, AbbrevData[i].getForm());
4461 /// EmitValue - Emit block data.
4463 void DIEBlock::EmitValue(DwarfDebug &DD, unsigned Form) {
4465 case DW_FORM_block1: DD.getAsm()->EmitInt8(Size); break;
4466 case DW_FORM_block2: DD.getAsm()->EmitInt16(Size); break;
4467 case DW_FORM_block4: DD.getAsm()->EmitInt32(Size); break;
4468 case DW_FORM_block: DD.getAsm()->EmitULEB128Bytes(Size); break;
4469 default: assert(0 && "Improper form for block"); break;
4472 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
4474 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
4476 Values[i]->EmitValue(DD, AbbrevData[i].getForm());
4480 /// SizeOf - Determine size of block data in bytes.
4482 unsigned DIEBlock::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4484 case DW_FORM_block1: return Size + sizeof(int8_t);
4485 case DW_FORM_block2: return Size + sizeof(int16_t);
4486 case DW_FORM_block4: return Size + sizeof(int32_t);
4487 case DW_FORM_block: return Size + TargetAsmInfo::getULEB128Size(Size);
4488 default: assert(0 && "Improper form for block"); break;
4493 //===----------------------------------------------------------------------===//
4494 /// DIE Implementation
4497 for (unsigned i = 0, N = Children.size(); i < N; ++i)
4501 /// AddSiblingOffset - Add a sibling offset field to the front of the DIE.
4503 void DIE::AddSiblingOffset() {
4504 DIEInteger *DI = new DIEInteger(0);
4505 Values.insert(Values.begin(), DI);
4506 Abbrev.AddFirstAttribute(DW_AT_sibling, DW_FORM_ref4);
4509 /// Profile - Used to gather unique data for the value folding set.
4511 void DIE::Profile(FoldingSetNodeID &ID) {
4514 for (unsigned i = 0, N = Children.size(); i < N; ++i)
4515 ID.AddPointer(Children[i]);
4517 for (unsigned j = 0, M = Values.size(); j < M; ++j)
4518 ID.AddPointer(Values[j]);
4522 void DIE::print(std::ostream &O, unsigned IncIndent) {
4523 static unsigned IndentCount = 0;
4524 IndentCount += IncIndent;
4525 const std::string Indent(IndentCount, ' ');
4526 bool isBlock = Abbrev.getTag() == 0;
4531 << "0x" << std::hex << (intptr_t)this << std::dec
4532 << ", Offset: " << Offset
4533 << ", Size: " << Size
4537 << TagString(Abbrev.getTag())
4539 << ChildrenString(Abbrev.getChildrenFlag());
4541 O << "Size: " << Size;
4545 const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData();
4548 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4552 O << AttributeString(Data[i].getAttribute());
4554 O << "Blk[" << i << "]";
4557 << FormEncodingString(Data[i].getForm())
4559 Values[i]->print(O);
4564 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
4565 Children[j]->print(O, 4);
4568 if (!isBlock) O << "\n";
4569 IndentCount -= IncIndent;
4577 //===----------------------------------------------------------------------===//
4578 /// DwarfWriter Implementation
4581 DwarfWriter::DwarfWriter()
4582 : ImmutablePass(&ID), DD(0), DE(0) {}
4584 DwarfWriter::~DwarfWriter() {
4589 /// BeginModule - Emit all Dwarf sections that should come prior to the
4591 void DwarfWriter::BeginModule(Module *M,
4592 MachineModuleInfo *MMI,
4593 raw_ostream &OS, AsmPrinter *A,
4594 const TargetAsmInfo *T) {
4595 DE = new DwarfException(OS, A, T);
4596 DD = new DwarfDebug(OS, A, T);
4599 DD->SetDebugInfo(MMI);
4600 DE->SetModuleInfo(MMI);
4603 /// EndModule - Emit all Dwarf sections that should come after the content.
4605 void DwarfWriter::EndModule() {
4610 /// BeginFunction - Gather pre-function debug information. Assumes being
4611 /// emitted immediately after the function entry point.
4612 void DwarfWriter::BeginFunction(MachineFunction *MF) {
4613 DE->BeginFunction(MF);
4614 DD->BeginFunction(MF);
4617 /// EndFunction - Gather and emit post-function debug information.
4619 void DwarfWriter::EndFunction(MachineFunction *MF) {
4620 DD->EndFunction(MF);
4623 if (MachineModuleInfo *MMI = DD->getMMI() ? DD->getMMI() : DE->getMMI())
4624 // Clear function debug information.
4628 /// ValidDebugInfo - Return true if V represents valid debug info value.
4629 bool DwarfWriter::ValidDebugInfo(Value *V, bool FastISel) {
4630 return DD && DD->ValidDebugInfo(V, FastISel);
4633 /// RecordSourceLine - Records location information and associates it with a
4634 /// label. Returns a unique label ID used to generate a label and provide
4635 /// correspondence to the source line list.
4636 unsigned DwarfWriter::RecordSourceLine(unsigned Line, unsigned Col,
4638 return DD->RecordSourceLine(Line, Col, Src);
4641 /// getOrCreateSourceID - Look up the source id with the given directory and
4642 /// source file names. If none currently exists, create a new id and insert it
4643 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
4645 unsigned DwarfWriter::getOrCreateSourceID(const std::string &DirName,
4646 const std::string &FileName) {
4647 return DD->getOrCreateSourceID(DirName, FileName);
4650 /// RecordRegionStart - Indicate the start of a region.
4651 unsigned DwarfWriter::RecordRegionStart(GlobalVariable *V) {
4652 return DD->RecordRegionStart(V);
4655 /// RecordRegionStart - Indicate the start of a region.
4656 unsigned DwarfWriter::RecordRegionStart(GlobalVariable *V, unsigned ID) {
4657 return DD->RecordRegionStart(V, ID);
4660 /// RecordRegionEnd - Indicate the end of a region.
4661 unsigned DwarfWriter::RecordRegionEnd(GlobalVariable *V) {
4662 return DD->RecordRegionEnd(V);
4665 /// getRecordSourceLineCount - Count source lines.
4666 unsigned DwarfWriter::getRecordSourceLineCount() {
4667 return DD->getRecordSourceLineCount();
4670 /// RecordVariable - Indicate the declaration of a local variable.
4672 void DwarfWriter::RecordVariable(GlobalVariable *GV, unsigned FrameIndex) {
4673 DD->RecordVariable(GV, FrameIndex);
4676 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
4678 bool DwarfWriter::ShouldEmitDwarfDebug() const {
4679 return DD->ShouldEmitDwarfDebug();
4682 //// RecordInlineInfo - Global variable GV is inlined at the location marked
4683 //// by LabelID label.
4684 void DwarfWriter::RecordInlineInfo(GlobalVariable *GV, unsigned LabelID) {
4685 DD->RecordInlineInfo(GV, LabelID);