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 std::map<std::string, 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 std::map<std::string, 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 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);
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 /// DebugTimer - Timer for the Dwarf debug writer.
1258 struct FunctionDebugFrameInfo {
1260 std::vector<MachineMove> Moves;
1262 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M):
1263 Number(Num), Moves(M) { }
1266 std::vector<FunctionDebugFrameInfo> DebugFrames;
1269 /// getSourceDirectoryAndFileIds - Return the directory and file ids that
1270 /// maps to the source id. Source id starts at 1.
1271 std::pair<unsigned, unsigned>
1272 getSourceDirectoryAndFileIds(unsigned SId) const {
1273 return SourceIds[SId-1];
1276 /// getNumSourceDirectories - Return the number of source directories in the
1278 unsigned getNumSourceDirectories() const {
1279 return DirectoryNames.size();
1282 /// getSourceDirectoryName - Return the name of the directory corresponding
1284 const std::string &getSourceDirectoryName(unsigned Id) const {
1285 return DirectoryNames[Id - 1];
1288 /// getSourceFileName - Return the name of the source file corresponding
1290 const std::string &getSourceFileName(unsigned Id) const {
1291 return SourceFileNames[Id - 1];
1294 /// getNumSourceIds - Return the number of unique source ids.
1295 unsigned getNumSourceIds() const {
1296 return SourceIds.size();
1299 /// AssignAbbrevNumber - Define a unique number for the abbreviation.
1301 void AssignAbbrevNumber(DIEAbbrev &Abbrev) {
1302 // Profile the node so that we can make it unique.
1303 FoldingSetNodeID ID;
1306 // Check the set for priors.
1307 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
1309 // If it's newly added.
1310 if (InSet == &Abbrev) {
1311 // Add to abbreviation list.
1312 Abbreviations.push_back(&Abbrev);
1313 // Assign the vector position + 1 as its number.
1314 Abbrev.setNumber(Abbreviations.size());
1316 // Assign existing abbreviation number.
1317 Abbrev.setNumber(InSet->getNumber());
1321 /// NewString - Add a string to the constant pool and returns a label.
1323 DWLabel NewString(const std::string &String) {
1324 unsigned StringID = StringPool.insert(String);
1325 return DWLabel("string", StringID);
1328 /// NewDIEntry - Creates a new DIEntry to be a proxy for a debug information
1330 DIEntry *NewDIEntry(DIE *Entry = NULL) {
1334 FoldingSetNodeID ID;
1335 DIEntry::Profile(ID, Entry);
1337 Value = static_cast<DIEntry *>(ValuesSet.FindNodeOrInsertPos(ID, Where));
1339 if (Value) return Value;
1341 Value = new DIEntry(Entry);
1342 ValuesSet.InsertNode(Value, Where);
1344 Value = new DIEntry(Entry);
1347 Values.push_back(Value);
1351 /// SetDIEntry - Set a DIEntry once the debug information entry is defined.
1353 void SetDIEntry(DIEntry *Value, DIE *Entry) {
1354 Value->setEntry(Entry);
1355 // Add to values set if not already there. If it is, we merely have a
1356 // duplicate in the values list (no harm.)
1357 ValuesSet.GetOrInsertNode(Value);
1360 /// AddUInt - Add an unsigned integer attribute data and value.
1362 void AddUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer) {
1363 if (!Form) Form = DIEInteger::BestForm(false, Integer);
1365 FoldingSetNodeID ID;
1366 DIEInteger::Profile(ID, Integer);
1368 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1370 Value = new DIEInteger(Integer);
1371 ValuesSet.InsertNode(Value, Where);
1372 Values.push_back(Value);
1375 Die->AddValue(Attribute, Form, Value);
1378 /// AddSInt - Add an signed integer attribute data and value.
1380 void AddSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer) {
1381 if (!Form) Form = DIEInteger::BestForm(true, Integer);
1383 FoldingSetNodeID ID;
1384 DIEInteger::Profile(ID, (uint64_t)Integer);
1386 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1388 Value = new DIEInteger(Integer);
1389 ValuesSet.InsertNode(Value, Where);
1390 Values.push_back(Value);
1393 Die->AddValue(Attribute, Form, Value);
1396 /// AddString - Add a string attribute data and value.
1398 void AddString(DIE *Die, unsigned Attribute, unsigned Form,
1399 const std::string &String) {
1400 FoldingSetNodeID ID;
1401 DIEString::Profile(ID, String);
1403 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1405 Value = new DIEString(String);
1406 ValuesSet.InsertNode(Value, Where);
1407 Values.push_back(Value);
1410 Die->AddValue(Attribute, Form, Value);
1413 /// AddLabel - Add a Dwarf label attribute data and value.
1415 void AddLabel(DIE *Die, unsigned Attribute, unsigned Form,
1416 const DWLabel &Label) {
1417 FoldingSetNodeID ID;
1418 DIEDwarfLabel::Profile(ID, Label);
1420 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1422 Value = new DIEDwarfLabel(Label);
1423 ValuesSet.InsertNode(Value, Where);
1424 Values.push_back(Value);
1427 Die->AddValue(Attribute, Form, Value);
1430 /// AddObjectLabel - Add an non-Dwarf label attribute data and value.
1432 void AddObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
1433 const std::string &Label) {
1434 FoldingSetNodeID ID;
1435 DIEObjectLabel::Profile(ID, Label);
1437 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1439 Value = new DIEObjectLabel(Label);
1440 ValuesSet.InsertNode(Value, Where);
1441 Values.push_back(Value);
1444 Die->AddValue(Attribute, Form, Value);
1447 /// AddSectionOffset - Add a section offset label attribute data and value.
1449 void AddSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
1450 const DWLabel &Label, const DWLabel &Section,
1451 bool isEH = false, bool useSet = true) {
1452 FoldingSetNodeID ID;
1453 DIESectionOffset::Profile(ID, Label, Section);
1455 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1457 Value = new DIESectionOffset(Label, Section, isEH, useSet);
1458 ValuesSet.InsertNode(Value, Where);
1459 Values.push_back(Value);
1462 Die->AddValue(Attribute, Form, Value);
1465 /// AddDelta - Add a label delta attribute data and value.
1467 void AddDelta(DIE *Die, unsigned Attribute, unsigned Form,
1468 const DWLabel &Hi, const DWLabel &Lo) {
1469 FoldingSetNodeID ID;
1470 DIEDelta::Profile(ID, Hi, Lo);
1472 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1474 Value = new DIEDelta(Hi, Lo);
1475 ValuesSet.InsertNode(Value, Where);
1476 Values.push_back(Value);
1479 Die->AddValue(Attribute, Form, Value);
1482 /// AddDIEntry - Add a DIE attribute data and value.
1484 void AddDIEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
1485 Die->AddValue(Attribute, Form, NewDIEntry(Entry));
1488 /// AddBlock - Add block data.
1490 void AddBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block) {
1491 Block->ComputeSize(*this);
1492 FoldingSetNodeID ID;
1495 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1498 ValuesSet.InsertNode(Value, Where);
1499 Values.push_back(Value);
1501 // Already exists, reuse the previous one.
1503 Block = cast<DIEBlock>(Value);
1506 Die->AddValue(Attribute, Block->BestForm(), Value);
1509 /// AddSourceLine - Add location information to specified debug information
1511 void AddSourceLine(DIE *Die, const DIVariable *V) {
1512 unsigned FileID = 0;
1513 unsigned Line = V->getLineNumber();
1514 CompileUnit *Unit = FindCompileUnit(V->getCompileUnit());
1515 FileID = Unit->getID();
1516 assert (FileID && "Invalid file id");
1517 AddUInt(Die, DW_AT_decl_file, 0, FileID);
1518 AddUInt(Die, DW_AT_decl_line, 0, Line);
1521 /// AddSourceLine - Add location information to specified debug information
1523 void AddSourceLine(DIE *Die, const DIGlobal *G) {
1524 unsigned FileID = 0;
1525 unsigned Line = G->getLineNumber();
1526 CompileUnit *Unit = FindCompileUnit(G->getCompileUnit());
1527 FileID = Unit->getID();
1528 assert (FileID && "Invalid file id");
1529 AddUInt(Die, DW_AT_decl_file, 0, FileID);
1530 AddUInt(Die, DW_AT_decl_line, 0, Line);
1533 void AddSourceLine(DIE *Die, const DIType *Ty) {
1534 unsigned FileID = 0;
1535 unsigned Line = Ty->getLineNumber();
1536 DICompileUnit CU = Ty->getCompileUnit();
1539 CompileUnit *Unit = FindCompileUnit(CU);
1540 FileID = Unit->getID();
1541 assert (FileID && "Invalid file id");
1542 AddUInt(Die, DW_AT_decl_file, 0, FileID);
1543 AddUInt(Die, DW_AT_decl_line, 0, Line);
1546 /// AddAddress - Add an address attribute to a die based on the location
1548 void AddAddress(DIE *Die, unsigned Attribute,
1549 const MachineLocation &Location) {
1550 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
1551 DIEBlock *Block = new DIEBlock();
1553 if (Location.isReg()) {
1555 AddUInt(Block, 0, DW_FORM_data1, DW_OP_reg0 + Reg);
1557 AddUInt(Block, 0, DW_FORM_data1, DW_OP_regx);
1558 AddUInt(Block, 0, DW_FORM_udata, Reg);
1562 AddUInt(Block, 0, DW_FORM_data1, DW_OP_breg0 + Reg);
1564 AddUInt(Block, 0, DW_FORM_data1, DW_OP_bregx);
1565 AddUInt(Block, 0, DW_FORM_udata, Reg);
1567 AddUInt(Block, 0, DW_FORM_sdata, Location.getOffset());
1570 AddBlock(Die, Attribute, 0, Block);
1573 /// AddType - Add a new type attribute to the specified entity.
1574 void AddType(CompileUnit *DW_Unit, DIE *Entity, DIType Ty) {
1578 // Check for pre-existence.
1579 DIEntry *&Slot = DW_Unit->getDIEntrySlotFor(Ty.getGV());
1580 // If it exists then use the existing value.
1582 Entity->AddValue(DW_AT_type, DW_FORM_ref4, Slot);
1587 Slot = NewDIEntry();
1590 DIE Buffer(DW_TAG_base_type);
1591 if (Ty.isBasicType(Ty.getTag()))
1592 ConstructTypeDIE(DW_Unit, Buffer, DIBasicType(Ty.getGV()));
1593 else if (Ty.isDerivedType(Ty.getTag()))
1594 ConstructTypeDIE(DW_Unit, Buffer, DIDerivedType(Ty.getGV()));
1596 assert(Ty.isCompositeType(Ty.getTag()) && "Unknown kind of DIType");
1597 ConstructTypeDIE(DW_Unit, Buffer, DICompositeType(Ty.getGV()));
1600 // Add debug information entry to entity and appropriate context.
1602 DIDescriptor Context = Ty.getContext();
1603 if (!Context.isNull())
1604 Die = DW_Unit->getDieMapSlotFor(Context.getGV());
1607 DIE *Child = new DIE(Buffer);
1608 Die->AddChild(Child);
1610 SetDIEntry(Slot, Child);
1612 Die = DW_Unit->AddDie(Buffer);
1613 SetDIEntry(Slot, Die);
1616 Entity->AddValue(DW_AT_type, DW_FORM_ref4, Slot);
1619 /// ConstructTypeDIE - Construct basic type die from DIBasicType.
1620 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1623 // Get core information.
1626 Buffer.setTag(DW_TAG_base_type);
1627 AddUInt(&Buffer, DW_AT_encoding, DW_FORM_data1, BTy.getEncoding());
1628 // Add name if not anonymous or intermediate type.
1630 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1631 uint64_t Size = BTy.getSizeInBits() >> 3;
1632 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1635 /// ConstructTypeDIE - Construct derived type die from DIDerivedType.
1636 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1637 DIDerivedType DTy) {
1639 // Get core information.
1642 uint64_t Size = DTy.getSizeInBits() >> 3;
1643 unsigned Tag = DTy.getTag();
1645 // FIXME - Workaround for templates.
1646 if (Tag == DW_TAG_inheritance) Tag = DW_TAG_reference_type;
1650 // Map to main type, void will not have a type.
1651 DIType FromTy = DTy.getTypeDerivedFrom();
1652 AddType(DW_Unit, &Buffer, FromTy);
1654 // Add name if not anonymous or intermediate type.
1656 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1658 // Add size if non-zero (derived types might be zero-sized.)
1660 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1662 // Add source line info if available and TyDesc is not a forward
1664 if (!DTy.isForwardDecl())
1665 AddSourceLine(&Buffer, &DTy);
1668 /// ConstructTypeDIE - Construct type DIE from DICompositeType.
1669 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1670 DICompositeType CTy) {
1671 // Get core information.
1675 uint64_t Size = CTy.getSizeInBits() >> 3;
1676 unsigned Tag = CTy.getTag();
1680 case DW_TAG_vector_type:
1681 case DW_TAG_array_type:
1682 ConstructArrayTypeDIE(DW_Unit, Buffer, &CTy);
1684 case DW_TAG_enumeration_type:
1686 DIArray Elements = CTy.getTypeArray();
1687 // Add enumerators to enumeration type.
1688 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1689 DIE *ElemDie = NULL;
1690 DIEnumerator Enum(Elements.getElement(i).getGV());
1691 ElemDie = ConstructEnumTypeDIE(DW_Unit, &Enum);
1692 Buffer.AddChild(ElemDie);
1696 case DW_TAG_subroutine_type:
1698 // Add prototype flag.
1699 AddUInt(&Buffer, DW_AT_prototyped, DW_FORM_flag, 1);
1700 DIArray Elements = CTy.getTypeArray();
1702 DIDescriptor RTy = Elements.getElement(0);
1703 AddType(DW_Unit, &Buffer, DIType(RTy.getGV()));
1706 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1707 DIE *Arg = new DIE(DW_TAG_formal_parameter);
1708 DIDescriptor Ty = Elements.getElement(i);
1709 AddType(DW_Unit, Arg, DIType(Ty.getGV()));
1710 Buffer.AddChild(Arg);
1714 case DW_TAG_structure_type:
1715 case DW_TAG_union_type:
1717 // Add elements to structure type.
1718 DIArray Elements = CTy.getTypeArray();
1720 // A forward struct declared type may not have elements available.
1721 if (Elements.isNull())
1724 // Add elements to structure type.
1725 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1726 DIDescriptor Element = Elements.getElement(i);
1727 DIE *ElemDie = NULL;
1728 if (Element.getTag() == dwarf::DW_TAG_subprogram)
1729 ElemDie = CreateSubprogramDIE(DW_Unit,
1730 DISubprogram(Element.getGV()));
1731 else if (Element.getTag() == dwarf::DW_TAG_variable) // ???
1732 ElemDie = CreateGlobalVariableDIE(DW_Unit,
1733 DIGlobalVariable(Element.getGV()));
1735 ElemDie = CreateMemberDIE(DW_Unit,
1736 DIDerivedType(Element.getGV()));
1737 Buffer.AddChild(ElemDie);
1739 unsigned RLang = CTy.getRunTimeLang();
1741 AddUInt(&Buffer, DW_AT_APPLE_runtime_class, DW_FORM_data1, RLang);
1748 // Add name if not anonymous or intermediate type.
1750 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1752 if (Tag == DW_TAG_enumeration_type || Tag == DW_TAG_structure_type
1753 || Tag == DW_TAG_union_type) {
1754 // Add size if non-zero (derived types might be zero-sized.)
1756 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1758 // Add zero size if it is not a forward declaration.
1759 if (CTy.isForwardDecl())
1760 AddUInt(&Buffer, DW_AT_declaration, DW_FORM_flag, 1);
1762 AddUInt(&Buffer, DW_AT_byte_size, 0, 0);
1765 // Add source line info if available.
1766 if (!CTy.isForwardDecl())
1767 AddSourceLine(&Buffer, &CTy);
1771 /// ConstructSubrangeDIE - Construct subrange DIE from DISubrange.
1772 void ConstructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) {
1773 int64_t L = SR.getLo();
1774 int64_t H = SR.getHi();
1775 DIE *DW_Subrange = new DIE(DW_TAG_subrange_type);
1777 AddDIEntry(DW_Subrange, DW_AT_type, DW_FORM_ref4, IndexTy);
1779 AddSInt(DW_Subrange, DW_AT_lower_bound, 0, L);
1780 AddSInt(DW_Subrange, DW_AT_upper_bound, 0, H);
1782 Buffer.AddChild(DW_Subrange);
1785 /// ConstructArrayTypeDIE - Construct array type DIE from DICompositeType.
1786 void ConstructArrayTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1787 DICompositeType *CTy) {
1788 Buffer.setTag(DW_TAG_array_type);
1789 if (CTy->getTag() == DW_TAG_vector_type)
1790 AddUInt(&Buffer, DW_AT_GNU_vector, DW_FORM_flag, 1);
1792 // Emit derived type.
1793 AddType(DW_Unit, &Buffer, CTy->getTypeDerivedFrom());
1794 DIArray Elements = CTy->getTypeArray();
1796 // Construct an anonymous type for index type.
1797 DIE IdxBuffer(DW_TAG_base_type);
1798 AddUInt(&IdxBuffer, DW_AT_byte_size, 0, sizeof(int32_t));
1799 AddUInt(&IdxBuffer, DW_AT_encoding, DW_FORM_data1, DW_ATE_signed);
1800 DIE *IndexTy = DW_Unit->AddDie(IdxBuffer);
1802 // Add subranges to array type.
1803 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1804 DIDescriptor Element = Elements.getElement(i);
1805 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1806 ConstructSubrangeDIE(Buffer, DISubrange(Element.getGV()), IndexTy);
1810 /// ConstructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
1811 DIE *ConstructEnumTypeDIE(CompileUnit *DW_Unit, DIEnumerator *ETy) {
1813 DIE *Enumerator = new DIE(DW_TAG_enumerator);
1816 AddString(Enumerator, DW_AT_name, DW_FORM_string, Name);
1817 int64_t Value = ETy->getEnumValue();
1818 AddSInt(Enumerator, DW_AT_const_value, DW_FORM_sdata, Value);
1822 /// CreateGlobalVariableDIE - Create new DIE using GV.
1823 DIE *CreateGlobalVariableDIE(CompileUnit *DW_Unit, const DIGlobalVariable &GV)
1825 DIE *GVDie = new DIE(DW_TAG_variable);
1827 GV.getDisplayName(Name);
1828 AddString(GVDie, DW_AT_name, DW_FORM_string, Name);
1829 std::string LinkageName;
1830 GV.getLinkageName(LinkageName);
1831 if (!LinkageName.empty())
1832 AddString(GVDie, DW_AT_MIPS_linkage_name, DW_FORM_string, LinkageName);
1833 AddType(DW_Unit, GVDie, GV.getType());
1834 if (!GV.isLocalToUnit())
1835 AddUInt(GVDie, DW_AT_external, DW_FORM_flag, 1);
1836 AddSourceLine(GVDie, &GV);
1840 /// CreateMemberDIE - Create new member DIE.
1841 DIE *CreateMemberDIE(CompileUnit *DW_Unit, const DIDerivedType &DT) {
1842 DIE *MemberDie = new DIE(DT.getTag());
1846 AddString(MemberDie, DW_AT_name, DW_FORM_string, Name);
1848 AddType(DW_Unit, MemberDie, DT.getTypeDerivedFrom());
1850 AddSourceLine(MemberDie, &DT);
1852 uint64_t Size = DT.getSizeInBits();
1853 uint64_t FieldSize = DT.getOriginalTypeSize();
1855 if (Size != FieldSize) {
1857 AddUInt(MemberDie, DW_AT_byte_size, 0, DT.getOriginalTypeSize() >> 3);
1858 AddUInt(MemberDie, DW_AT_bit_size, 0, DT.getSizeInBits());
1860 uint64_t Offset = DT.getOffsetInBits();
1861 uint64_t FieldOffset = Offset;
1862 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1863 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1864 FieldOffset = (HiMark - FieldSize);
1865 Offset -= FieldOffset;
1866 // Maybe we need to work from the other end.
1867 if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size);
1868 AddUInt(MemberDie, DW_AT_bit_offset, 0, Offset);
1870 DIEBlock *Block = new DIEBlock();
1871 AddUInt(Block, 0, DW_FORM_data1, DW_OP_plus_uconst);
1872 AddUInt(Block, 0, DW_FORM_udata, DT.getOffsetInBits() >> 3);
1873 AddBlock(MemberDie, DW_AT_data_member_location, 0, Block);
1875 if (DT.isProtected())
1876 AddUInt(MemberDie, DW_AT_accessibility, 0, DW_ACCESS_protected);
1877 else if (DT.isPrivate())
1878 AddUInt(MemberDie, DW_AT_accessibility, 0, DW_ACCESS_private);
1883 /// CreateSubprogramDIE - Create new DIE using SP.
1884 DIE *CreateSubprogramDIE(CompileUnit *DW_Unit,
1885 const DISubprogram &SP,
1886 bool IsConstructor = false) {
1887 DIE *SPDie = new DIE(DW_TAG_subprogram);
1890 AddString(SPDie, DW_AT_name, DW_FORM_string, Name);
1891 std::string LinkageName;
1892 SP.getLinkageName(LinkageName);
1893 if (!LinkageName.empty())
1894 AddString(SPDie, DW_AT_MIPS_linkage_name, DW_FORM_string,
1896 AddSourceLine(SPDie, &SP);
1898 DICompositeType SPTy = SP.getType();
1899 DIArray Args = SPTy.getTypeArray();
1902 if (!IsConstructor) {
1904 AddType(DW_Unit, SPDie, SPTy);
1906 AddType(DW_Unit, SPDie, DIType(Args.getElement(0).getGV()));
1909 if (!SP.isDefinition()) {
1910 AddUInt(SPDie, DW_AT_declaration, DW_FORM_flag, 1);
1912 // Do not add arguments for subprogram definition. They will be
1913 // handled through RecordVariable.
1915 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1916 DIE *Arg = new DIE(DW_TAG_formal_parameter);
1917 AddType(DW_Unit, Arg, DIType(Args.getElement(i).getGV()));
1918 AddUInt(Arg, DW_AT_artificial, DW_FORM_flag, 1); // ???
1919 SPDie->AddChild(Arg);
1923 unsigned Lang = SP.getCompileUnit().getLanguage();
1924 if (Lang == DW_LANG_C99 || Lang == DW_LANG_C89
1925 || Lang == DW_LANG_ObjC)
1926 AddUInt(SPDie, DW_AT_prototyped, DW_FORM_flag, 1);
1928 if (!SP.isLocalToUnit())
1929 AddUInt(SPDie, DW_AT_external, DW_FORM_flag, 1);
1933 /// FindCompileUnit - Get the compile unit for the given descriptor.
1935 CompileUnit *FindCompileUnit(DICompileUnit Unit) {
1936 CompileUnit *DW_Unit = CompileUnitMap[Unit.getGV()];
1937 assert(DW_Unit && "Missing compile unit.");
1941 /// NewDbgScopeVariable - Create a new scope variable.
1943 DIE *NewDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit) {
1944 // Get the descriptor.
1945 const DIVariable &VD = DV->getVariable();
1947 // Translate tag to proper Dwarf tag. The result variable is dropped for
1950 switch (VD.getTag()) {
1951 case DW_TAG_return_variable: return NULL;
1952 case DW_TAG_arg_variable: Tag = DW_TAG_formal_parameter; break;
1953 case DW_TAG_auto_variable: // fall thru
1954 default: Tag = DW_TAG_variable; break;
1957 // Define variable debug information entry.
1958 DIE *VariableDie = new DIE(Tag);
1961 AddString(VariableDie, DW_AT_name, DW_FORM_string, Name);
1963 // Add source line info if available.
1964 AddSourceLine(VariableDie, &VD);
1966 // Add variable type.
1967 AddType(Unit, VariableDie, VD.getType());
1969 // Add variable address.
1970 MachineLocation Location;
1971 Location.set(RI->getFrameRegister(*MF),
1972 RI->getFrameIndexOffset(*MF, DV->getFrameIndex()));
1973 AddAddress(VariableDie, DW_AT_location, Location);
1978 /// getOrCreateScope - Returns the scope associated with the given descriptor.
1980 DbgScope *getOrCreateScope(GlobalVariable *V) {
1981 DbgScope *&Slot = DbgScopeMap[V];
1982 if (Slot) return Slot;
1984 // FIXME - breaks down when the context is an inlined function.
1985 DIDescriptor ParentDesc;
1986 DIDescriptor Desc(V);
1988 if (Desc.getTag() == dwarf::DW_TAG_lexical_block) {
1990 ParentDesc = Block.getContext();
1993 DbgScope *Parent = ParentDesc.isNull() ?
1994 NULL : getOrCreateScope(ParentDesc.getGV());
1995 Slot = new DbgScope(Parent, Desc);
1998 Parent->AddScope(Slot);
1999 } else if (RootDbgScope) {
2000 // FIXME - Add inlined function scopes to the root so we can delete them
2001 // later. Long term, handle inlined functions properly.
2002 RootDbgScope->AddScope(Slot);
2004 // First function is top level function.
2005 RootDbgScope = Slot;
2011 /// ConstructDbgScope - Construct the components of a scope.
2013 void ConstructDbgScope(DbgScope *ParentScope,
2014 unsigned ParentStartID, unsigned ParentEndID,
2015 DIE *ParentDie, CompileUnit *Unit) {
2016 // Add variables to scope.
2017 SmallVector<DbgVariable *, 8> &Variables = ParentScope->getVariables();
2018 for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
2019 DIE *VariableDie = NewDbgScopeVariable(Variables[i], Unit);
2020 if (VariableDie) ParentDie->AddChild(VariableDie);
2023 // Add nested scopes.
2024 SmallVector<DbgScope *, 4> &Scopes = ParentScope->getScopes();
2025 for (unsigned j = 0, M = Scopes.size(); j < M; ++j) {
2026 // Define the Scope debug information entry.
2027 DbgScope *Scope = Scopes[j];
2028 // FIXME - Ignore inlined functions for the time being.
2029 if (!Scope->getParent()) continue;
2031 unsigned StartID = MMI->MappedLabel(Scope->getStartLabelID());
2032 unsigned EndID = MMI->MappedLabel(Scope->getEndLabelID());
2034 // Ignore empty scopes.
2035 if (StartID == EndID && StartID != 0) continue;
2036 if (Scope->getScopes().empty() && Scope->getVariables().empty()) continue;
2038 if (StartID == ParentStartID && EndID == ParentEndID) {
2039 // Just add stuff to the parent scope.
2040 ConstructDbgScope(Scope, ParentStartID, ParentEndID, ParentDie, Unit);
2042 DIE *ScopeDie = new DIE(DW_TAG_lexical_block);
2044 // Add the scope bounds.
2046 AddLabel(ScopeDie, DW_AT_low_pc, DW_FORM_addr,
2047 DWLabel("label", StartID));
2049 AddLabel(ScopeDie, DW_AT_low_pc, DW_FORM_addr,
2050 DWLabel("func_begin", SubprogramCount));
2053 AddLabel(ScopeDie, DW_AT_high_pc, DW_FORM_addr,
2054 DWLabel("label", EndID));
2056 AddLabel(ScopeDie, DW_AT_high_pc, DW_FORM_addr,
2057 DWLabel("func_end", SubprogramCount));
2060 // Add the scope contents.
2061 ConstructDbgScope(Scope, StartID, EndID, ScopeDie, Unit);
2062 ParentDie->AddChild(ScopeDie);
2067 /// ConstructRootDbgScope - Construct the scope for the subprogram.
2069 void ConstructRootDbgScope(DbgScope *RootScope) {
2070 // Exit if there is no root scope.
2071 if (!RootScope) return;
2072 DIDescriptor Desc = RootScope->getDesc();
2076 // Get the subprogram debug information entry.
2077 DISubprogram SPD(Desc.getGV());
2079 // Get the compile unit context.
2080 CompileUnit *Unit = MainCU;
2082 Unit = FindCompileUnit(SPD.getCompileUnit());
2084 // Get the subprogram die.
2085 DIE *SPDie = Unit->getDieMapSlotFor(SPD.getGV());
2086 assert(SPDie && "Missing subprogram descriptor");
2088 // Add the function bounds.
2089 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2090 DWLabel("func_begin", SubprogramCount));
2091 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2092 DWLabel("func_end", SubprogramCount));
2093 MachineLocation Location(RI->getFrameRegister(*MF));
2094 AddAddress(SPDie, DW_AT_frame_base, Location);
2096 ConstructDbgScope(RootScope, 0, 0, SPDie, Unit);
2099 /// ConstructDefaultDbgScope - Construct a default scope for the subprogram.
2101 void ConstructDefaultDbgScope(MachineFunction *MF) {
2102 const char *FnName = MF->getFunction()->getNameStart();
2104 std::map<std::string, DIE*> &Globals = MainCU->getGlobals();
2105 std::map<std::string, DIE*>::iterator GI = Globals.find(FnName);
2106 if (GI != Globals.end()) {
2107 DIE *SPDie = GI->second;
2109 // Add the function bounds.
2110 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2111 DWLabel("func_begin", SubprogramCount));
2112 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2113 DWLabel("func_end", SubprogramCount));
2115 MachineLocation Location(RI->getFrameRegister(*MF));
2116 AddAddress(SPDie, DW_AT_frame_base, Location);
2120 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i) {
2121 CompileUnit *Unit = CompileUnits[i];
2122 std::map<std::string, DIE*> &Globals = Unit->getGlobals();
2123 std::map<std::string, DIE*>::iterator GI = Globals.find(FnName);
2124 if (GI != Globals.end()) {
2125 DIE *SPDie = GI->second;
2127 // Add the function bounds.
2128 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2129 DWLabel("func_begin", SubprogramCount));
2130 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2131 DWLabel("func_end", SubprogramCount));
2133 MachineLocation Location(RI->getFrameRegister(*MF));
2134 AddAddress(SPDie, DW_AT_frame_base, Location);
2141 // FIXME: This is causing an abort because C++ mangled names are compared
2142 // with their unmangled counterparts. See PR2885. Don't do this assert.
2143 assert(0 && "Couldn't find DIE for machine function!");
2148 /// EmitInitial - Emit initial Dwarf declarations. This is necessary for cc
2149 /// tools to recognize the object file contains Dwarf information.
2150 void EmitInitial() {
2151 // Check to see if we already emitted intial headers.
2152 if (didInitial) return;
2155 // Dwarf sections base addresses.
2156 if (TAI->doesDwarfRequireFrameSection()) {
2157 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2158 EmitLabel("section_debug_frame", 0);
2160 Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
2161 EmitLabel("section_info", 0);
2162 Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
2163 EmitLabel("section_abbrev", 0);
2164 Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
2165 EmitLabel("section_aranges", 0);
2166 if (TAI->doesSupportMacInfoSection()) {
2167 Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
2168 EmitLabel("section_macinfo", 0);
2170 Asm->SwitchToDataSection(TAI->getDwarfLineSection());
2171 EmitLabel("section_line", 0);
2172 Asm->SwitchToDataSection(TAI->getDwarfLocSection());
2173 EmitLabel("section_loc", 0);
2174 Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
2175 EmitLabel("section_pubnames", 0);
2176 Asm->SwitchToDataSection(TAI->getDwarfStrSection());
2177 EmitLabel("section_str", 0);
2178 Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
2179 EmitLabel("section_ranges", 0);
2181 Asm->SwitchToSection(TAI->getTextSection());
2182 EmitLabel("text_begin", 0);
2183 Asm->SwitchToSection(TAI->getDataSection());
2184 EmitLabel("data_begin", 0);
2187 /// EmitDIE - Recusively Emits a debug information entry.
2189 void EmitDIE(DIE *Die) {
2190 // Get the abbreviation for this DIE.
2191 unsigned AbbrevNumber = Die->getAbbrevNumber();
2192 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2196 // Emit the code (index) for the abbreviation.
2197 Asm->EmitULEB128Bytes(AbbrevNumber);
2200 Asm->EOL(std::string("Abbrev [" +
2201 utostr(AbbrevNumber) +
2202 "] 0x" + utohexstr(Die->getOffset()) +
2203 ":0x" + utohexstr(Die->getSize()) + " " +
2204 TagString(Abbrev->getTag())));
2208 SmallVector<DIEValue*, 32> &Values = Die->getValues();
2209 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2211 // Emit the DIE attribute values.
2212 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2213 unsigned Attr = AbbrevData[i].getAttribute();
2214 unsigned Form = AbbrevData[i].getForm();
2215 assert(Form && "Too many attributes for DIE (check abbreviation)");
2218 case DW_AT_sibling: {
2219 Asm->EmitInt32(Die->SiblingOffset());
2223 // Emit an attribute using the defined form.
2224 Values[i]->EmitValue(*this, Form);
2229 Asm->EOL(AttributeString(Attr));
2232 // Emit the DIE children if any.
2233 if (Abbrev->getChildrenFlag() == DW_CHILDREN_yes) {
2234 const std::vector<DIE *> &Children = Die->getChildren();
2236 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
2237 EmitDIE(Children[j]);
2240 Asm->EmitInt8(0); Asm->EOL("End Of Children Mark");
2244 /// SizeAndOffsetDie - Compute the size and offset of a DIE.
2246 unsigned SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last) {
2247 // Get the children.
2248 const std::vector<DIE *> &Children = Die->getChildren();
2250 // If not last sibling and has children then add sibling offset attribute.
2251 if (!Last && !Children.empty()) Die->AddSiblingOffset();
2253 // Record the abbreviation.
2254 AssignAbbrevNumber(Die->getAbbrev());
2256 // Get the abbreviation for this DIE.
2257 unsigned AbbrevNumber = Die->getAbbrevNumber();
2258 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2261 Die->setOffset(Offset);
2263 // Start the size with the size of abbreviation code.
2264 Offset += TargetAsmInfo::getULEB128Size(AbbrevNumber);
2266 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2267 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2269 // Size the DIE attribute values.
2270 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2271 // Size attribute value.
2272 Offset += Values[i]->SizeOf(*this, AbbrevData[i].getForm());
2275 // Size the DIE children if any.
2276 if (!Children.empty()) {
2277 assert(Abbrev->getChildrenFlag() == DW_CHILDREN_yes &&
2278 "Children flag not set");
2280 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
2281 Offset = SizeAndOffsetDie(Children[j], Offset, (j + 1) == M);
2284 // End of children marker.
2285 Offset += sizeof(int8_t);
2288 Die->setSize(Offset - Die->getOffset());
2292 /// SizeAndOffsets - Compute the size and offset of all the DIEs.
2294 void SizeAndOffsets() {
2295 // Process base compile unit.
2297 // Compute size of compile unit header
2298 unsigned Offset = sizeof(int32_t) + // Length of Compilation Unit Info
2299 sizeof(int16_t) + // DWARF version number
2300 sizeof(int32_t) + // Offset Into Abbrev. Section
2301 sizeof(int8_t); // Pointer Size (in bytes)
2302 SizeAndOffsetDie(MainCU->getDie(), Offset, true);
2305 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i) {
2306 CompileUnit *Unit = CompileUnits[i];
2307 // Compute size of compile unit header
2308 unsigned Offset = sizeof(int32_t) + // Length of Compilation Unit Info
2309 sizeof(int16_t) + // DWARF version number
2310 sizeof(int32_t) + // Offset Into Abbrev. Section
2311 sizeof(int8_t); // Pointer Size (in bytes)
2312 SizeAndOffsetDie(Unit->getDie(), Offset, true);
2316 /// EmitDebugInfo / EmitDebugInfoPerCU - Emit the debug info section.
2318 void EmitDebugInfoPerCU(CompileUnit *Unit) {
2319 DIE *Die = Unit->getDie();
2320 // Emit the compile units header.
2321 EmitLabel("info_begin", Unit->getID());
2322 // Emit size of content not including length itself
2323 unsigned ContentSize = Die->getSize() +
2324 sizeof(int16_t) + // DWARF version number
2325 sizeof(int32_t) + // Offset Into Abbrev. Section
2326 sizeof(int8_t) + // Pointer Size (in bytes)
2327 sizeof(int32_t); // FIXME - extra pad for gdb bug.
2329 Asm->EmitInt32(ContentSize); Asm->EOL("Length of Compilation Unit Info");
2330 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
2331 EmitSectionOffset("abbrev_begin", "section_abbrev", 0, 0, true, false);
2332 Asm->EOL("Offset Into Abbrev. Section");
2333 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
2336 // FIXME - extra padding for gdb bug.
2337 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2338 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2339 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2340 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2341 EmitLabel("info_end", Unit->getID());
2346 void EmitDebugInfo() {
2347 // Start debug info section.
2348 Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
2351 EmitDebugInfoPerCU(MainCU);
2355 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i)
2356 EmitDebugInfoPerCU(CompileUnits[i]);
2359 /// EmitAbbreviations - Emit the abbreviation section.
2361 void EmitAbbreviations() const {
2362 // Check to see if it is worth the effort.
2363 if (!Abbreviations.empty()) {
2364 // Start the debug abbrev section.
2365 Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
2367 EmitLabel("abbrev_begin", 0);
2369 // For each abbrevation.
2370 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2371 // Get abbreviation data
2372 const DIEAbbrev *Abbrev = Abbreviations[i];
2374 // Emit the abbrevations code (base 1 index.)
2375 Asm->EmitULEB128Bytes(Abbrev->getNumber());
2376 Asm->EOL("Abbreviation Code");
2378 // Emit the abbreviations data.
2379 Abbrev->Emit(*this);
2384 // Mark end of abbreviations.
2385 Asm->EmitULEB128Bytes(0); Asm->EOL("EOM(3)");
2387 EmitLabel("abbrev_end", 0);
2393 /// EmitEndOfLineMatrix - Emit the last address of the section and the end of
2394 /// the line matrix.
2396 void EmitEndOfLineMatrix(unsigned SectionEnd) {
2397 // Define last address of section.
2398 Asm->EmitInt8(0); Asm->EOL("Extended Op");
2399 Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
2400 Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
2401 EmitReference("section_end", SectionEnd); Asm->EOL("Section end label");
2403 // Mark end of matrix.
2404 Asm->EmitInt8(0); Asm->EOL("DW_LNE_end_sequence");
2405 Asm->EmitULEB128Bytes(1); Asm->EOL();
2406 Asm->EmitInt8(1); Asm->EOL();
2409 /// EmitDebugLines - Emit source line information.
2411 void EmitDebugLines() {
2412 // If the target is using .loc/.file, the assembler will be emitting the
2413 // .debug_line table automatically.
2414 if (TAI->hasDotLocAndDotFile())
2417 // Minimum line delta, thus ranging from -10..(255-10).
2418 const int MinLineDelta = -(DW_LNS_fixed_advance_pc + 1);
2419 // Maximum line delta, thus ranging from -10..(255-10).
2420 const int MaxLineDelta = 255 + MinLineDelta;
2422 // Start the dwarf line section.
2423 Asm->SwitchToDataSection(TAI->getDwarfLineSection());
2425 // Construct the section header.
2427 EmitDifference("line_end", 0, "line_begin", 0, true);
2428 Asm->EOL("Length of Source Line Info");
2429 EmitLabel("line_begin", 0);
2431 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
2433 EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0, true);
2434 Asm->EOL("Prolog Length");
2435 EmitLabel("line_prolog_begin", 0);
2437 Asm->EmitInt8(1); Asm->EOL("Minimum Instruction Length");
2439 Asm->EmitInt8(1); Asm->EOL("Default is_stmt_start flag");
2441 Asm->EmitInt8(MinLineDelta); Asm->EOL("Line Base Value (Special Opcodes)");
2443 Asm->EmitInt8(MaxLineDelta); Asm->EOL("Line Range Value (Special Opcodes)");
2445 Asm->EmitInt8(-MinLineDelta); Asm->EOL("Special Opcode Base");
2447 // Line number standard opcode encodings argument count
2448 Asm->EmitInt8(0); Asm->EOL("DW_LNS_copy arg count");
2449 Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_pc arg count");
2450 Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_line arg count");
2451 Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_file arg count");
2452 Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_column arg count");
2453 Asm->EmitInt8(0); Asm->EOL("DW_LNS_negate_stmt arg count");
2454 Asm->EmitInt8(0); Asm->EOL("DW_LNS_set_basic_block arg count");
2455 Asm->EmitInt8(0); Asm->EOL("DW_LNS_const_add_pc arg count");
2456 Asm->EmitInt8(1); Asm->EOL("DW_LNS_fixed_advance_pc arg count");
2458 // Emit directories.
2459 for (unsigned DI = 1, DE = getNumSourceDirectories()+1; DI != DE; ++DI) {
2460 Asm->EmitString(getSourceDirectoryName(DI));
2461 Asm->EOL("Directory");
2463 Asm->EmitInt8(0); Asm->EOL("End of directories");
2466 for (unsigned SI = 1, SE = getNumSourceIds()+1; SI != SE; ++SI) {
2467 // Remember source id starts at 1.
2468 std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(SI);
2469 Asm->EmitString(getSourceFileName(Id.second));
2471 Asm->EmitULEB128Bytes(Id.first);
2472 Asm->EOL("Directory #");
2473 Asm->EmitULEB128Bytes(0);
2474 Asm->EOL("Mod date");
2475 Asm->EmitULEB128Bytes(0);
2476 Asm->EOL("File size");
2478 Asm->EmitInt8(0); Asm->EOL("End of files");
2480 EmitLabel("line_prolog_end", 0);
2482 // A sequence for each text section.
2483 unsigned SecSrcLinesSize = SectionSourceLines.size();
2485 for (unsigned j = 0; j < SecSrcLinesSize; ++j) {
2486 // Isolate current sections line info.
2487 const std::vector<SrcLineInfo> &LineInfos = SectionSourceLines[j];
2490 const Section* S = SectionMap[j + 1];
2491 O << '\t' << TAI->getCommentString() << " Section"
2492 << S->getName() << '\n';
2496 // Dwarf assumes we start with first line of first source file.
2497 unsigned Source = 1;
2500 // Construct rows of the address, source, line, column matrix.
2501 for (unsigned i = 0, N = LineInfos.size(); i < N; ++i) {
2502 const SrcLineInfo &LineInfo = LineInfos[i];
2503 unsigned LabelID = MMI->MappedLabel(LineInfo.getLabelID());
2504 if (!LabelID) continue;
2509 std::pair<unsigned, unsigned> SourceID =
2510 getSourceDirectoryAndFileIds(LineInfo.getSourceID());
2511 O << '\t' << TAI->getCommentString() << ' '
2512 << getSourceDirectoryName(SourceID.first) << ' '
2513 << getSourceFileName(SourceID.second)
2514 <<" :" << utostr_32(LineInfo.getLine()) << '\n';
2517 // Define the line address.
2518 Asm->EmitInt8(0); Asm->EOL("Extended Op");
2519 Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
2520 Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
2521 EmitReference("label", LabelID); Asm->EOL("Location label");
2523 // If change of source, then switch to the new source.
2524 if (Source != LineInfo.getSourceID()) {
2525 Source = LineInfo.getSourceID();
2526 Asm->EmitInt8(DW_LNS_set_file); Asm->EOL("DW_LNS_set_file");
2527 Asm->EmitULEB128Bytes(Source); Asm->EOL("New Source");
2530 // If change of line.
2531 if (Line != LineInfo.getLine()) {
2532 // Determine offset.
2533 int Offset = LineInfo.getLine() - Line;
2534 int Delta = Offset - MinLineDelta;
2537 Line = LineInfo.getLine();
2539 // If delta is small enough and in range...
2540 if (Delta >= 0 && Delta < (MaxLineDelta - 1)) {
2541 // ... then use fast opcode.
2542 Asm->EmitInt8(Delta - MinLineDelta); Asm->EOL("Line Delta");
2544 // ... otherwise use long hand.
2545 Asm->EmitInt8(DW_LNS_advance_line); Asm->EOL("DW_LNS_advance_line");
2546 Asm->EmitSLEB128Bytes(Offset); Asm->EOL("Line Offset");
2547 Asm->EmitInt8(DW_LNS_copy); Asm->EOL("DW_LNS_copy");
2550 // Copy the previous row (different address or source)
2551 Asm->EmitInt8(DW_LNS_copy); Asm->EOL("DW_LNS_copy");
2555 EmitEndOfLineMatrix(j + 1);
2558 if (SecSrcLinesSize == 0)
2559 // Because we're emitting a debug_line section, we still need a line
2560 // table. The linker and friends expect it to exist. If there's nothing to
2561 // put into it, emit an empty table.
2562 EmitEndOfLineMatrix(1);
2564 EmitLabel("line_end", 0);
2569 /// EmitCommonDebugFrame - Emit common frame info into a debug frame section.
2571 void EmitCommonDebugFrame() {
2572 if (!TAI->doesDwarfRequireFrameSection())
2576 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
2577 TargetFrameInfo::StackGrowsUp ?
2578 TD->getPointerSize() : -TD->getPointerSize();
2580 // Start the dwarf frame section.
2581 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2583 EmitLabel("debug_frame_common", 0);
2584 EmitDifference("debug_frame_common_end", 0,
2585 "debug_frame_common_begin", 0, true);
2586 Asm->EOL("Length of Common Information Entry");
2588 EmitLabel("debug_frame_common_begin", 0);
2589 Asm->EmitInt32((int)DW_CIE_ID);
2590 Asm->EOL("CIE Identifier Tag");
2591 Asm->EmitInt8(DW_CIE_VERSION);
2592 Asm->EOL("CIE Version");
2593 Asm->EmitString("");
2594 Asm->EOL("CIE Augmentation");
2595 Asm->EmitULEB128Bytes(1);
2596 Asm->EOL("CIE Code Alignment Factor");
2597 Asm->EmitSLEB128Bytes(stackGrowth);
2598 Asm->EOL("CIE Data Alignment Factor");
2599 Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), false));
2600 Asm->EOL("CIE RA Column");
2602 std::vector<MachineMove> Moves;
2603 RI->getInitialFrameState(Moves);
2605 EmitFrameMoves(NULL, 0, Moves, false);
2607 Asm->EmitAlignment(2, 0, 0, false);
2608 EmitLabel("debug_frame_common_end", 0);
2613 /// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
2615 void EmitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo) {
2616 if (!TAI->doesDwarfRequireFrameSection())
2619 // Start the dwarf frame section.
2620 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2622 EmitDifference("debug_frame_end", DebugFrameInfo.Number,
2623 "debug_frame_begin", DebugFrameInfo.Number, true);
2624 Asm->EOL("Length of Frame Information Entry");
2626 EmitLabel("debug_frame_begin", DebugFrameInfo.Number);
2628 EmitSectionOffset("debug_frame_common", "section_debug_frame",
2630 Asm->EOL("FDE CIE offset");
2632 EmitReference("func_begin", DebugFrameInfo.Number);
2633 Asm->EOL("FDE initial location");
2634 EmitDifference("func_end", DebugFrameInfo.Number,
2635 "func_begin", DebugFrameInfo.Number);
2636 Asm->EOL("FDE address range");
2638 EmitFrameMoves("func_begin", DebugFrameInfo.Number, DebugFrameInfo.Moves,
2641 Asm->EmitAlignment(2, 0, 0, false);
2642 EmitLabel("debug_frame_end", DebugFrameInfo.Number);
2647 void EmitDebugPubNamesPerCU(CompileUnit *Unit) {
2648 EmitDifference("pubnames_end", Unit->getID(),
2649 "pubnames_begin", Unit->getID(), true);
2650 Asm->EOL("Length of Public Names Info");
2652 EmitLabel("pubnames_begin", Unit->getID());
2654 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF Version");
2656 EmitSectionOffset("info_begin", "section_info",
2657 Unit->getID(), 0, true, false);
2658 Asm->EOL("Offset of Compilation Unit Info");
2660 EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID(),
2662 Asm->EOL("Compilation Unit Length");
2664 std::map<std::string, DIE *> &Globals = Unit->getGlobals();
2665 for (std::map<std::string, DIE *>::iterator GI = Globals.begin(),
2666 GE = Globals.end(); GI != GE; ++GI) {
2667 const std::string &Name = GI->first;
2668 DIE * Entity = GI->second;
2670 Asm->EmitInt32(Entity->getOffset()); Asm->EOL("DIE offset");
2671 Asm->EmitString(Name); Asm->EOL("External Name");
2674 Asm->EmitInt32(0); Asm->EOL("End Mark");
2675 EmitLabel("pubnames_end", Unit->getID());
2680 /// EmitDebugPubNames - Emit visible names into a debug pubnames section.
2682 void EmitDebugPubNames() {
2683 // Start the dwarf pubnames section.
2684 Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
2687 EmitDebugPubNamesPerCU(MainCU);
2691 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i)
2692 EmitDebugPubNamesPerCU(CompileUnits[i]);
2695 /// EmitDebugStr - Emit visible names into a debug str section.
2697 void EmitDebugStr() {
2698 // Check to see if it is worth the effort.
2699 if (!StringPool.empty()) {
2700 // Start the dwarf str section.
2701 Asm->SwitchToDataSection(TAI->getDwarfStrSection());
2703 // For each of strings in the string pool.
2704 for (unsigned StringID = 1, N = StringPool.size();
2705 StringID <= N; ++StringID) {
2706 // Emit a label for reference from debug information entries.
2707 EmitLabel("string", StringID);
2708 // Emit the string itself.
2709 const std::string &String = StringPool[StringID];
2710 Asm->EmitString(String); Asm->EOL();
2717 /// EmitDebugLoc - Emit visible names into a debug loc section.
2719 void EmitDebugLoc() {
2720 // Start the dwarf loc section.
2721 Asm->SwitchToDataSection(TAI->getDwarfLocSection());
2726 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2728 void EmitDebugARanges() {
2729 // Start the dwarf aranges section.
2730 Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
2734 CompileUnit *Unit = GetBaseCompileUnit();
2736 // Don't include size of length
2737 Asm->EmitInt32(0x1c); Asm->EOL("Length of Address Ranges Info");
2739 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("Dwarf Version");
2741 EmitReference("info_begin", Unit->getID());
2742 Asm->EOL("Offset of Compilation Unit Info");
2744 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Size of Address");
2746 Asm->EmitInt8(0); Asm->EOL("Size of Segment Descriptor");
2748 Asm->EmitInt16(0); Asm->EOL("Pad (1)");
2749 Asm->EmitInt16(0); Asm->EOL("Pad (2)");
2752 EmitReference("text_begin", 0); Asm->EOL("Address");
2753 EmitDifference("text_end", 0, "text_begin", 0, true); Asm->EOL("Length");
2755 Asm->EmitInt32(0); Asm->EOL("EOM (1)");
2756 Asm->EmitInt32(0); Asm->EOL("EOM (2)");
2762 /// EmitDebugRanges - Emit visible names into a debug ranges section.
2764 void EmitDebugRanges() {
2765 // Start the dwarf ranges section.
2766 Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
2771 /// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
2773 void EmitDebugMacInfo() {
2774 if (TAI->doesSupportMacInfoSection()) {
2775 // Start the dwarf macinfo section.
2776 Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
2782 /// GetOrCreateSourceID - Look up the source id with the given directory and
2783 /// source file names. If none currently exists, create a new id and insert it
2784 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
2786 unsigned GetOrCreateSourceID(const std::string &DirName,
2787 const std::string &FileName) {
2789 StringMap<unsigned>::iterator DI = DirectoryIdMap.find(DirName);
2790 if (DI != DirectoryIdMap.end()) {
2791 DId = DI->getValue();
2793 DId = DirectoryNames.size() + 1;
2794 DirectoryIdMap[DirName] = DId;
2795 DirectoryNames.push_back(DirName);
2799 StringMap<unsigned>::iterator FI = SourceFileIdMap.find(FileName);
2800 if (FI != SourceFileIdMap.end()) {
2801 FId = FI->getValue();
2803 FId = SourceFileNames.size() + 1;
2804 SourceFileIdMap[FileName] = FId;
2805 SourceFileNames.push_back(FileName);
2808 DenseMap<std::pair<unsigned, unsigned>, unsigned>::iterator SI =
2809 SourceIdMap.find(std::make_pair(DId, FId));
2810 if (SI != SourceIdMap.end())
2813 unsigned SrcId = SourceIds.size() + 1; // DW_AT_decl_file cannot be 0.
2814 SourceIdMap[std::make_pair(DId, FId)] = SrcId;
2815 SourceIds.push_back(std::make_pair(DId, FId));
2820 void ConstructCompileUnit(GlobalVariable *GV) {
2821 DICompileUnit DIUnit(GV);
2822 std::string Dir, FN, Prod;
2823 unsigned ID = GetOrCreateSourceID(DIUnit.getDirectory(Dir),
2824 DIUnit.getFilename(FN));
2826 DIE *Die = new DIE(DW_TAG_compile_unit);
2827 AddSectionOffset(Die, DW_AT_stmt_list, DW_FORM_data4,
2828 DWLabel("section_line", 0), DWLabel("section_line", 0),
2830 AddString(Die, DW_AT_producer, DW_FORM_string, DIUnit.getProducer(Prod));
2831 AddUInt(Die, DW_AT_language, DW_FORM_data1, DIUnit.getLanguage());
2832 AddString(Die, DW_AT_name, DW_FORM_string, FN);
2834 AddString(Die, DW_AT_comp_dir, DW_FORM_string, Dir);
2835 if (DIUnit.isOptimized())
2836 AddUInt(Die, DW_AT_APPLE_optimized, DW_FORM_flag, 1);
2838 DIUnit.getFlags(Flags);
2840 AddString(Die, DW_AT_APPLE_flags, DW_FORM_string, Flags);
2841 unsigned RVer = DIUnit.getRunTimeVersion();
2843 AddUInt(Die, DW_AT_APPLE_major_runtime_vers, DW_FORM_data1, RVer);
2845 CompileUnit *Unit = new CompileUnit(ID, Die);
2846 if (DIUnit.isMain()) {
2847 assert(!MainCU && "Multiple main compile units are found!");
2850 CompileUnitMap[DIUnit.getGV()] = Unit;
2851 CompileUnits.push_back(Unit);
2854 /// ConstructCompileUnits - Create a compile unit DIEs.
2855 void ConstructCompileUnits() {
2856 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.compile_units");
2859 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
2860 "Malformed compile unit descriptor anchor type");
2861 Constant *RootC = cast<Constant>(*Root->use_begin());
2862 assert(RootC->hasNUsesOrMore(1) &&
2863 "Malformed compile unit descriptor anchor type");
2864 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
2866 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
2867 UUI != UUE; ++UUI) {
2868 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
2869 ConstructCompileUnit(GV);
2873 bool ConstructGlobalVariableDIE(GlobalVariable *GV) {
2874 DIGlobalVariable DI_GV(GV);
2875 CompileUnit *DW_Unit = MainCU;
2877 DW_Unit = FindCompileUnit(DI_GV.getCompileUnit());
2879 // Check for pre-existence.
2880 DIE *&Slot = DW_Unit->getDieMapSlotFor(DI_GV.getGV());
2884 DIE *VariableDie = CreateGlobalVariableDIE(DW_Unit, DI_GV);
2887 DIEBlock *Block = new DIEBlock();
2888 AddUInt(Block, 0, DW_FORM_data1, DW_OP_addr);
2889 AddObjectLabel(Block, 0, DW_FORM_udata,
2890 Asm->getGlobalLinkName(DI_GV.getGlobal()));
2891 AddBlock(VariableDie, DW_AT_location, 0, Block);
2895 // Add to context owner.
2896 DW_Unit->getDie()->AddChild(VariableDie);
2897 // Expose as global. FIXME - need to check external flag.
2899 DW_Unit->AddGlobal(DI_GV.getName(Name), VariableDie);
2903 /// ConstructGlobalVariableDIEs - Create DIEs for each of the externally
2904 /// visible global variables. Return true if at least one global DIE is
2906 bool ConstructGlobalVariableDIEs() {
2907 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.global_variables");
2911 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
2912 "Malformed global variable descriptor anchor type");
2913 Constant *RootC = cast<Constant>(*Root->use_begin());
2914 assert(RootC->hasNUsesOrMore(1) &&
2915 "Malformed global variable descriptor anchor type");
2917 bool Result = false;
2918 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
2920 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
2921 UUI != UUE; ++UUI) {
2922 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
2923 Result |= ConstructGlobalVariableDIE(GV);
2928 bool ConstructSubprogram(GlobalVariable *GV) {
2929 DISubprogram SP(GV);
2930 CompileUnit *Unit = MainCU;
2932 Unit = FindCompileUnit(SP.getCompileUnit());
2934 // Check for pre-existence.
2935 DIE *&Slot = Unit->getDieMapSlotFor(GV);
2939 if (!SP.isDefinition())
2940 // This is a method declaration which will be handled while
2941 // constructing class type.
2944 DIE *SubprogramDie = CreateSubprogramDIE(Unit, SP);
2947 Slot = SubprogramDie;
2948 // Add to context owner.
2949 Unit->getDie()->AddChild(SubprogramDie);
2950 // Expose as global.
2952 Unit->AddGlobal(SP.getName(Name), SubprogramDie);
2956 /// ConstructSubprograms - Create DIEs for each of the externally visible
2957 /// subprograms. Return true if at least one subprogram DIE is created.
2958 bool ConstructSubprograms() {
2959 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.subprograms");
2963 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
2964 "Malformed subprogram descriptor anchor type");
2965 Constant *RootC = cast<Constant>(*Root->use_begin());
2966 assert(RootC->hasNUsesOrMore(1) &&
2967 "Malformed subprogram descriptor anchor type");
2969 bool Result = false;
2970 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
2972 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
2973 UUI != UUE; ++UUI) {
2974 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
2975 Result |= ConstructSubprogram(GV);
2981 //===--------------------------------------------------------------------===//
2982 // Main entry points.
2984 DwarfDebug(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
2985 : Dwarf(OS, A, T, "dbg"), MainCU(0),
2986 AbbreviationsSet(InitAbbreviationsSetSize), Abbreviations(),
2987 ValuesSet(InitValuesSetSize), Values(), StringPool(), SectionMap(),
2988 SectionSourceLines(), didInitial(false), shouldEmit(false),
2989 RootDbgScope(0), DebugTimer(0) {
2990 if (TimePassesIsEnabled)
2991 DebugTimer = new Timer("Dwarf Debug Writer",
2992 getDwarfTimerGroup());
2994 virtual ~DwarfDebug() {
2995 for (unsigned j = 0, M = Values.size(); j < M; ++j)
3001 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
3003 bool ShouldEmitDwarfDebug() const { return shouldEmit; }
3005 /// SetDebugInfo - Create global DIEs and emit initial debug info sections.
3006 /// This is inovked by the target AsmPrinter.
3007 void SetDebugInfo(MachineModuleInfo *mmi) {
3008 if (TimePassesIsEnabled)
3009 DebugTimer->startTimer();
3011 // Create all the compile unit DIEs.
3012 ConstructCompileUnits();
3014 if (CompileUnits.empty()) {
3015 if (TimePassesIsEnabled)
3016 DebugTimer->stopTimer();
3021 // Create DIEs for each of the externally visible global variables.
3022 bool globalDIEs = ConstructGlobalVariableDIEs();
3024 // Create DIEs for each of the externally visible subprograms.
3025 bool subprogramDIEs = ConstructSubprograms();
3027 // If there is not any debug info available for any global variables
3028 // and any subprograms then there is not any debug info to emit.
3029 if (!globalDIEs && !subprogramDIEs) {
3030 if (TimePassesIsEnabled)
3031 DebugTimer->stopTimer();
3038 MMI->setDebugInfoAvailability(true);
3040 // Prime section data.
3041 SectionMap.insert(TAI->getTextSection());
3043 // Print out .file directives to specify files for .loc directives. These
3044 // are printed out early so that they precede any .loc directives.
3045 if (TAI->hasDotLocAndDotFile()) {
3046 for (unsigned i = 1, e = getNumSourceIds()+1; i != e; ++i) {
3047 // Remember source id starts at 1.
3048 std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(i);
3049 sys::Path FullPath(getSourceDirectoryName(Id.first));
3051 FullPath.appendComponent(getSourceFileName(Id.second));
3052 assert(AppendOk && "Could not append filename to directory!");
3054 Asm->EmitFile(i, FullPath.toString());
3059 // Emit initial sections
3062 if (TimePassesIsEnabled)
3063 DebugTimer->stopTimer();
3066 /// BeginModule - Emit all Dwarf sections that should come prior to the
3068 void BeginModule(Module *M) {
3072 /// EndModule - Emit all Dwarf sections that should come after the content.
3075 if (!ShouldEmitDwarfDebug())
3078 if (TimePassesIsEnabled)
3079 DebugTimer->startTimer();
3081 // Standard sections final addresses.
3082 Asm->SwitchToSection(TAI->getTextSection());
3083 EmitLabel("text_end", 0);
3084 Asm->SwitchToSection(TAI->getDataSection());
3085 EmitLabel("data_end", 0);
3087 // End text sections.
3088 for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
3089 Asm->SwitchToSection(SectionMap[i]);
3090 EmitLabel("section_end", i);
3093 // Emit common frame information.
3094 EmitCommonDebugFrame();
3096 // Emit function debug frame information
3097 for (std::vector<FunctionDebugFrameInfo>::iterator I = DebugFrames.begin(),
3098 E = DebugFrames.end(); I != E; ++I)
3099 EmitFunctionDebugFrame(*I);
3101 // Compute DIE offsets and sizes.
3104 // Emit all the DIEs into a debug info section
3107 // Corresponding abbreviations into a abbrev section.
3108 EmitAbbreviations();
3110 // Emit source line correspondence into a debug line section.
3113 // Emit info into a debug pubnames section.
3114 EmitDebugPubNames();
3116 // Emit info into a debug str section.
3119 // Emit info into a debug loc section.
3122 // Emit info into a debug aranges section.
3125 // Emit info into a debug ranges section.
3128 // Emit info into a debug macinfo section.
3131 if (TimePassesIsEnabled)
3132 DebugTimer->stopTimer();
3135 /// BeginFunction - Gather pre-function debug information. Assumes being
3136 /// emitted immediately after the function entry point.
3137 void BeginFunction(MachineFunction *MF) {
3140 if (!ShouldEmitDwarfDebug()) return;
3142 if (TimePassesIsEnabled)
3143 DebugTimer->startTimer();
3145 // Begin accumulating function debug information.
3146 MMI->BeginFunction(MF);
3148 // Assumes in correct section after the entry point.
3149 EmitLabel("func_begin", ++SubprogramCount);
3151 // Emit label for the implicitly defined dbg.stoppoint at the start of
3153 if (!Lines.empty()) {
3154 const SrcLineInfo &LineInfo = Lines[0];
3155 Asm->printLabel(LineInfo.getLabelID());
3158 if (TimePassesIsEnabled)
3159 DebugTimer->stopTimer();
3162 /// EndFunction - Gather and emit post-function debug information.
3164 void EndFunction(MachineFunction *MF) {
3165 if (!ShouldEmitDwarfDebug()) return;
3167 if (TimePassesIsEnabled)
3168 DebugTimer->startTimer();
3170 // Define end label for subprogram.
3171 EmitLabel("func_end", SubprogramCount);
3173 // Get function line info.
3174 if (!Lines.empty()) {
3175 // Get section line info.
3176 unsigned ID = SectionMap.insert(Asm->CurrentSection_);
3177 if (SectionSourceLines.size() < ID) SectionSourceLines.resize(ID);
3178 std::vector<SrcLineInfo> &SectionLineInfos = SectionSourceLines[ID-1];
3179 // Append the function info to section info.
3180 SectionLineInfos.insert(SectionLineInfos.end(),
3181 Lines.begin(), Lines.end());
3184 // Construct scopes for subprogram.
3186 ConstructRootDbgScope(RootDbgScope);
3188 // FIXME: This is wrong. We are essentially getting past a problem with
3189 // debug information not being able to handle unreachable blocks that have
3190 // debug information in them. In particular, those unreachable blocks that
3191 // have "region end" info in them. That situation results in the "root
3192 // scope" not being created. If that's the case, then emit a "default"
3193 // scope, i.e., one that encompasses the whole function. This isn't
3194 // desirable. And a better way of handling this (and all of the debugging
3195 // information) needs to be explored.
3196 ConstructDefaultDbgScope(MF);
3198 DebugFrames.push_back(FunctionDebugFrameInfo(SubprogramCount,
3199 MMI->getFrameMoves()));
3203 delete RootDbgScope;
3204 DbgScopeMap.clear();
3205 RootDbgScope = NULL;
3210 if (TimePassesIsEnabled)
3211 DebugTimer->stopTimer();
3214 /// ValidDebugInfo - Return true if V represents valid debug info value.
3215 bool ValidDebugInfo(Value *V) {
3222 GlobalVariable *GV = getGlobalVariable(V);
3226 if (!GV->hasInternalLinkage () && !GV->hasLinkOnceLinkage())
3229 if (TimePassesIsEnabled)
3230 DebugTimer->startTimer();
3232 DIDescriptor DI(GV);
3234 // Check current version. Allow Version6 for now.
3235 unsigned Version = DI.getVersion();
3236 if (Version != LLVMDebugVersion && Version != LLVMDebugVersion6) {
3237 if (TimePassesIsEnabled)
3238 DebugTimer->stopTimer();
3243 unsigned Tag = DI.getTag();
3245 case DW_TAG_variable:
3246 assert(DIVariable(GV).Verify() && "Invalid DebugInfo value");
3248 case DW_TAG_compile_unit:
3249 assert(DICompileUnit(GV).Verify() && "Invalid DebugInfo value");
3251 case DW_TAG_subprogram:
3252 assert(DISubprogram(GV).Verify() && "Invalid DebugInfo value");
3258 if (TimePassesIsEnabled)
3259 DebugTimer->stopTimer();
3264 /// RecordSourceLine - Records location information and associates it with a
3265 /// label. Returns a unique label ID used to generate a label and provide
3266 /// correspondence to the source line list.
3267 unsigned RecordSourceLine(Value *V, unsigned Line, unsigned Col) {
3268 if (TimePassesIsEnabled)
3269 DebugTimer->startTimer();
3271 CompileUnit *Unit = CompileUnitMap[V];
3272 assert(Unit && "Unable to find CompileUnit");
3273 unsigned ID = MMI->NextLabelID();
3274 Lines.push_back(SrcLineInfo(Line, Col, Unit->getID(), ID));
3276 if (TimePassesIsEnabled)
3277 DebugTimer->stopTimer();
3282 /// RecordSourceLine - Records location information and associates it with a
3283 /// label. Returns a unique label ID used to generate a label and provide
3284 /// correspondence to the source line list.
3285 unsigned RecordSourceLine(unsigned Line, unsigned Col, unsigned Src) {
3286 if (TimePassesIsEnabled)
3287 DebugTimer->startTimer();
3289 unsigned ID = MMI->NextLabelID();
3290 Lines.push_back(SrcLineInfo(Line, Col, Src, ID));
3292 if (TimePassesIsEnabled)
3293 DebugTimer->stopTimer();
3298 /// getRecordSourceLineCount - Return the number of source lines in the debug
3300 unsigned getRecordSourceLineCount() const {
3301 return Lines.size();
3304 /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
3305 /// timed. Look up the source id with the given directory and source file
3306 /// names. If none currently exists, create a new id and insert it in the
3307 /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
3309 unsigned getOrCreateSourceID(const std::string &DirName,
3310 const std::string &FileName) {
3311 if (TimePassesIsEnabled)
3312 DebugTimer->startTimer();
3314 unsigned SrcId = GetOrCreateSourceID(DirName, FileName);
3316 if (TimePassesIsEnabled)
3317 DebugTimer->stopTimer();
3322 /// RecordRegionStart - Indicate the start of a region.
3323 unsigned RecordRegionStart(GlobalVariable *V) {
3324 if (TimePassesIsEnabled)
3325 DebugTimer->startTimer();
3327 DbgScope *Scope = getOrCreateScope(V);
3328 unsigned ID = MMI->NextLabelID();
3329 if (!Scope->getStartLabelID()) Scope->setStartLabelID(ID);
3331 if (TimePassesIsEnabled)
3332 DebugTimer->stopTimer();
3337 /// RecordRegionEnd - Indicate the end of a region.
3338 unsigned RecordRegionEnd(GlobalVariable *V) {
3339 if (TimePassesIsEnabled)
3340 DebugTimer->startTimer();
3342 DbgScope *Scope = getOrCreateScope(V);
3343 unsigned ID = MMI->NextLabelID();
3344 Scope->setEndLabelID(ID);
3346 if (TimePassesIsEnabled)
3347 DebugTimer->stopTimer();
3352 /// RecordVariable - Indicate the declaration of a local variable.
3353 void RecordVariable(GlobalVariable *GV, unsigned FrameIndex) {
3354 if (TimePassesIsEnabled)
3355 DebugTimer->startTimer();
3357 DIDescriptor Desc(GV);
3358 DbgScope *Scope = NULL;
3360 if (Desc.getTag() == DW_TAG_variable) {
3361 // GV is a global variable.
3362 DIGlobalVariable DG(GV);
3363 Scope = getOrCreateScope(DG.getContext().getGV());
3365 // or GV is a local variable.
3367 Scope = getOrCreateScope(DV.getContext().getGV());
3370 assert(Scope && "Unable to find variable' scope");
3371 DbgVariable *DV = new DbgVariable(DIVariable(GV), FrameIndex);
3372 Scope->AddVariable(DV);
3374 if (TimePassesIsEnabled)
3375 DebugTimer->stopTimer();
3379 //===----------------------------------------------------------------------===//
3380 /// DwarfException - Emits Dwarf exception handling directives.
3382 class DwarfException : public Dwarf {
3383 struct FunctionEHFrameInfo {
3386 unsigned PersonalityIndex;
3388 bool hasLandingPads;
3389 std::vector<MachineMove> Moves;
3390 const Function * function;
3392 FunctionEHFrameInfo(const std::string &FN, unsigned Num, unsigned P,
3394 const std::vector<MachineMove> &M,
3396 FnName(FN), Number(Num), PersonalityIndex(P),
3397 hasCalls(hC), hasLandingPads(hL), Moves(M), function (f) { }
3400 std::vector<FunctionEHFrameInfo> EHFrames;
3402 /// shouldEmitTable - Per-function flag to indicate if EH tables should
3404 bool shouldEmitTable;
3406 /// shouldEmitMoves - Per-function flag to indicate if frame moves info
3407 /// should be emitted.
3408 bool shouldEmitMoves;
3410 /// shouldEmitTableModule - Per-module flag to indicate if EH tables
3411 /// should be emitted.
3412 bool shouldEmitTableModule;
3414 /// shouldEmitFrameModule - Per-module flag to indicate if frame moves
3415 /// should be emitted.
3416 bool shouldEmitMovesModule;
3418 /// ExceptionTimer - Timer for the Dwarf exception writer.
3419 Timer *ExceptionTimer;
3421 /// EmitCommonEHFrame - Emit the common eh unwind frame.
3423 void EmitCommonEHFrame(const Function *Personality, unsigned Index) {
3424 // Size and sign of stack growth.
3426 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
3427 TargetFrameInfo::StackGrowsUp ?
3428 TD->getPointerSize() : -TD->getPointerSize();
3430 // Begin eh frame section.
3431 Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
3433 if (!TAI->doesRequireNonLocalEHFrameLabel())
3434 O << TAI->getEHGlobalPrefix();
3435 O << "EH_frame" << Index << ":\n";
3436 EmitLabel("section_eh_frame", Index);
3438 // Define base labels.
3439 EmitLabel("eh_frame_common", Index);
3441 // Define the eh frame length.
3442 EmitDifference("eh_frame_common_end", Index,
3443 "eh_frame_common_begin", Index, true);
3444 Asm->EOL("Length of Common Information Entry");
3447 EmitLabel("eh_frame_common_begin", Index);
3448 Asm->EmitInt32((int)0);
3449 Asm->EOL("CIE Identifier Tag");
3450 Asm->EmitInt8(DW_CIE_VERSION);
3451 Asm->EOL("CIE Version");
3453 // The personality presence indicates that language specific information
3454 // will show up in the eh frame.
3455 Asm->EmitString(Personality ? "zPLR" : "zR");
3456 Asm->EOL("CIE Augmentation");
3458 // Round out reader.
3459 Asm->EmitULEB128Bytes(1);
3460 Asm->EOL("CIE Code Alignment Factor");
3461 Asm->EmitSLEB128Bytes(stackGrowth);
3462 Asm->EOL("CIE Data Alignment Factor");
3463 Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true));
3464 Asm->EOL("CIE Return Address Column");
3466 // If there is a personality, we need to indicate the functions location.
3468 Asm->EmitULEB128Bytes(7);
3469 Asm->EOL("Augmentation Size");
3471 if (TAI->getNeedsIndirectEncoding()) {
3472 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect);
3473 Asm->EOL("Personality (pcrel sdata4 indirect)");
3475 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3476 Asm->EOL("Personality (pcrel sdata4)");
3479 PrintRelDirective(true);
3480 O << TAI->getPersonalityPrefix();
3481 Asm->EmitExternalGlobal((const GlobalVariable *)(Personality));
3482 O << TAI->getPersonalitySuffix();
3483 if (strcmp(TAI->getPersonalitySuffix(), "+4@GOTPCREL"))
3484 O << "-" << TAI->getPCSymbol();
3485 Asm->EOL("Personality");
3487 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3488 Asm->EOL("LSDA Encoding (pcrel sdata4)");
3490 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3491 Asm->EOL("FDE Encoding (pcrel sdata4)");
3493 Asm->EmitULEB128Bytes(1);
3494 Asm->EOL("Augmentation Size");
3496 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3497 Asm->EOL("FDE Encoding (pcrel sdata4)");
3500 // Indicate locations of general callee saved registers in frame.
3501 std::vector<MachineMove> Moves;
3502 RI->getInitialFrameState(Moves);
3503 EmitFrameMoves(NULL, 0, Moves, true);
3505 // On Darwin the linker honors the alignment of eh_frame, which means it
3506 // must be 8-byte on 64-bit targets to match what gcc does. Otherwise
3507 // you get holes which confuse readers of eh_frame.
3508 Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
3510 EmitLabel("eh_frame_common_end", Index);
3515 /// EmitEHFrame - Emit function exception frame information.
3517 void EmitEHFrame(const FunctionEHFrameInfo &EHFrameInfo) {
3518 Function::LinkageTypes linkage = EHFrameInfo.function->getLinkage();
3520 Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
3522 // Externally visible entry into the functions eh frame info.
3523 // If the corresponding function is static, this should not be
3524 // externally visible.
3525 if (linkage != Function::InternalLinkage &&
3526 linkage != Function::PrivateLinkage) {
3527 if (const char *GlobalEHDirective = TAI->getGlobalEHDirective())
3528 O << GlobalEHDirective << EHFrameInfo.FnName << "\n";
3531 // If corresponding function is weak definition, this should be too.
3532 if ((linkage == Function::WeakAnyLinkage ||
3533 linkage == Function::WeakODRLinkage ||
3534 linkage == Function::LinkOnceAnyLinkage ||
3535 linkage == Function::LinkOnceODRLinkage) &&
3536 TAI->getWeakDefDirective())
3537 O << TAI->getWeakDefDirective() << EHFrameInfo.FnName << "\n";
3539 // If there are no calls then you can't unwind. This may mean we can
3540 // omit the EH Frame, but some environments do not handle weak absolute
3542 // If UnwindTablesMandatory is set we cannot do this optimization; the
3543 // unwind info is to be available for non-EH uses.
3544 if (!EHFrameInfo.hasCalls &&
3545 !UnwindTablesMandatory &&
3546 ((linkage != Function::WeakAnyLinkage &&
3547 linkage != Function::WeakODRLinkage &&
3548 linkage != Function::LinkOnceAnyLinkage &&
3549 linkage != Function::LinkOnceODRLinkage) ||
3550 !TAI->getWeakDefDirective() ||
3551 TAI->getSupportsWeakOmittedEHFrame()))
3553 O << EHFrameInfo.FnName << " = 0\n";
3554 // This name has no connection to the function, so it might get
3555 // dead-stripped when the function is not, erroneously. Prohibit
3556 // dead-stripping unconditionally.
3557 if (const char *UsedDirective = TAI->getUsedDirective())
3558 O << UsedDirective << EHFrameInfo.FnName << "\n\n";
3560 O << EHFrameInfo.FnName << ":\n";
3563 EmitDifference("eh_frame_end", EHFrameInfo.Number,
3564 "eh_frame_begin", EHFrameInfo.Number, true);
3565 Asm->EOL("Length of Frame Information Entry");
3567 EmitLabel("eh_frame_begin", EHFrameInfo.Number);
3569 if (TAI->doesRequireNonLocalEHFrameLabel()) {
3570 PrintRelDirective(true, true);
3571 PrintLabelName("eh_frame_begin", EHFrameInfo.Number);
3573 if (!TAI->isAbsoluteEHSectionOffsets())
3574 O << "-EH_frame" << EHFrameInfo.PersonalityIndex;
3576 EmitSectionOffset("eh_frame_begin", "eh_frame_common",
3577 EHFrameInfo.Number, EHFrameInfo.PersonalityIndex,
3581 Asm->EOL("FDE CIE offset");
3583 EmitReference("eh_func_begin", EHFrameInfo.Number, true, true);
3584 Asm->EOL("FDE initial location");
3585 EmitDifference("eh_func_end", EHFrameInfo.Number,
3586 "eh_func_begin", EHFrameInfo.Number, true);
3587 Asm->EOL("FDE address range");
3589 // If there is a personality and landing pads then point to the language
3590 // specific data area in the exception table.
3591 if (EHFrameInfo.PersonalityIndex) {
3592 Asm->EmitULEB128Bytes(4);
3593 Asm->EOL("Augmentation size");
3595 if (EHFrameInfo.hasLandingPads)
3596 EmitReference("exception", EHFrameInfo.Number, true, true);
3598 Asm->EmitInt32((int)0);
3599 Asm->EOL("Language Specific Data Area");
3601 Asm->EmitULEB128Bytes(0);
3602 Asm->EOL("Augmentation size");
3605 // Indicate locations of function specific callee saved registers in
3607 EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves,
3610 // On Darwin the linker honors the alignment of eh_frame, which means it
3611 // must be 8-byte on 64-bit targets to match what gcc does. Otherwise
3612 // you get holes which confuse readers of eh_frame.
3613 Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
3615 EmitLabel("eh_frame_end", EHFrameInfo.Number);
3617 // If the function is marked used, this table should be also. We cannot
3618 // make the mark unconditional in this case, since retaining the table
3619 // also retains the function in this case, and there is code around
3620 // that depends on unused functions (calling undefined externals) being
3621 // dead-stripped to link correctly. Yes, there really is.
3622 if (MMI->getUsedFunctions().count(EHFrameInfo.function))
3623 if (const char *UsedDirective = TAI->getUsedDirective())
3624 O << UsedDirective << EHFrameInfo.FnName << "\n\n";
3628 /// EmitExceptionTable - Emit landing pads and actions.
3630 /// The general organization of the table is complex, but the basic concepts
3631 /// are easy. First there is a header which describes the location and
3632 /// organization of the three components that follow.
3633 /// 1. The landing pad site information describes the range of code covered
3634 /// by the try. In our case it's an accumulation of the ranges covered
3635 /// by the invokes in the try. There is also a reference to the landing
3636 /// pad that handles the exception once processed. Finally an index into
3637 /// the actions table.
3638 /// 2. The action table, in our case, is composed of pairs of type ids
3639 /// and next action offset. Starting with the action index from the
3640 /// landing pad site, each type Id is checked for a match to the current
3641 /// exception. If it matches then the exception and type id are passed
3642 /// on to the landing pad. Otherwise the next action is looked up. This
3643 /// chain is terminated with a next action of zero. If no type id is
3644 /// found the the frame is unwound and handling continues.
3645 /// 3. Type id table contains references to all the C++ typeinfo for all
3646 /// catches in the function. This tables is reversed indexed base 1.
3648 /// SharedTypeIds - How many leading type ids two landing pads have in common.
3649 static unsigned SharedTypeIds(const LandingPadInfo *L,
3650 const LandingPadInfo *R) {
3651 const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
3652 unsigned LSize = LIds.size(), RSize = RIds.size();
3653 unsigned MinSize = LSize < RSize ? LSize : RSize;
3656 for (; Count != MinSize; ++Count)
3657 if (LIds[Count] != RIds[Count])
3663 /// PadLT - Order landing pads lexicographically by type id.
3664 static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R) {
3665 const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
3666 unsigned LSize = LIds.size(), RSize = RIds.size();
3667 unsigned MinSize = LSize < RSize ? LSize : RSize;
3669 for (unsigned i = 0; i != MinSize; ++i)
3670 if (LIds[i] != RIds[i])
3671 return LIds[i] < RIds[i];
3673 return LSize < RSize;
3677 static inline unsigned getEmptyKey() { return -1U; }
3678 static inline unsigned getTombstoneKey() { return -2U; }
3679 static unsigned getHashValue(const unsigned &Key) { return Key; }
3680 static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
3681 static bool isPod() { return true; }
3684 /// ActionEntry - Structure describing an entry in the actions table.
3685 struct ActionEntry {
3686 int ValueForTypeID; // The value to write - may not be equal to the type id.
3688 struct ActionEntry *Previous;
3691 /// PadRange - Structure holding a try-range and the associated landing pad.
3693 // The index of the landing pad.
3695 // The index of the begin and end labels in the landing pad's label lists.
3696 unsigned RangeIndex;
3699 typedef DenseMap<unsigned, PadRange, KeyInfo> RangeMapType;
3701 /// CallSiteEntry - Structure describing an entry in the call-site table.
3702 struct CallSiteEntry {
3703 // The 'try-range' is BeginLabel .. EndLabel.
3704 unsigned BeginLabel; // zero indicates the start of the function.
3705 unsigned EndLabel; // zero indicates the end of the function.
3706 // The landing pad starts at PadLabel.
3707 unsigned PadLabel; // zero indicates that there is no landing pad.
3711 void EmitExceptionTable() {
3712 const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
3713 const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
3714 const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
3715 if (PadInfos.empty()) return;
3717 // Sort the landing pads in order of their type ids. This is used to fold
3718 // duplicate actions.
3719 SmallVector<const LandingPadInfo *, 64> LandingPads;
3720 LandingPads.reserve(PadInfos.size());
3721 for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
3722 LandingPads.push_back(&PadInfos[i]);
3723 std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
3725 // Negative type ids index into FilterIds, positive type ids index into
3726 // TypeInfos. The value written for a positive type id is just the type
3727 // id itself. For a negative type id, however, the value written is the
3728 // (negative) byte offset of the corresponding FilterIds entry. The byte
3729 // offset is usually equal to the type id, because the FilterIds entries
3730 // are written using a variable width encoding which outputs one byte per
3731 // entry as long as the value written is not too large, but can differ.
3732 // This kind of complication does not occur for positive type ids because
3733 // type infos are output using a fixed width encoding.
3734 // FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
3735 SmallVector<int, 16> FilterOffsets;
3736 FilterOffsets.reserve(FilterIds.size());
3738 for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
3739 E = FilterIds.end(); I != E; ++I) {
3740 FilterOffsets.push_back(Offset);
3741 Offset -= TargetAsmInfo::getULEB128Size(*I);
3744 // Compute the actions table and gather the first action index for each
3745 // landing pad site.
3746 SmallVector<ActionEntry, 32> Actions;
3747 SmallVector<unsigned, 64> FirstActions;
3748 FirstActions.reserve(LandingPads.size());
3750 int FirstAction = 0;
3751 unsigned SizeActions = 0;
3752 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
3753 const LandingPadInfo *LP = LandingPads[i];
3754 const std::vector<int> &TypeIds = LP->TypeIds;
3755 const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
3756 unsigned SizeSiteActions = 0;
3758 if (NumShared < TypeIds.size()) {
3759 unsigned SizeAction = 0;
3760 ActionEntry *PrevAction = 0;
3763 const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
3764 assert(Actions.size());
3765 PrevAction = &Actions.back();
3766 SizeAction = TargetAsmInfo::getSLEB128Size(PrevAction->NextAction) +
3767 TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
3768 for (unsigned j = NumShared; j != SizePrevIds; ++j) {
3770 TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
3771 SizeAction += -PrevAction->NextAction;
3772 PrevAction = PrevAction->Previous;
3776 // Compute the actions.
3777 for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
3778 int TypeID = TypeIds[I];
3779 assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
3780 int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
3781 unsigned SizeTypeID = TargetAsmInfo::getSLEB128Size(ValueForTypeID);
3783 int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
3784 SizeAction = SizeTypeID + TargetAsmInfo::getSLEB128Size(NextAction);
3785 SizeSiteActions += SizeAction;
3787 ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
3788 Actions.push_back(Action);
3790 PrevAction = &Actions.back();
3793 // Record the first action of the landing pad site.
3794 FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
3795 } // else identical - re-use previous FirstAction
3797 FirstActions.push_back(FirstAction);
3799 // Compute this sites contribution to size.
3800 SizeActions += SizeSiteActions;
3803 // Compute the call-site table. The entry for an invoke has a try-range
3804 // containing the call, a non-zero landing pad and an appropriate action.
3805 // The entry for an ordinary call has a try-range containing the call and
3806 // zero for the landing pad and the action. Calls marked 'nounwind' have
3807 // no entry and must not be contained in the try-range of any entry - they
3808 // form gaps in the table. Entries must be ordered by try-range address.
3809 SmallVector<CallSiteEntry, 64> CallSites;
3811 RangeMapType PadMap;
3812 // Invokes and nounwind calls have entries in PadMap (due to being bracketed
3813 // by try-range labels when lowered). Ordinary calls do not, so appropriate
3814 // try-ranges for them need be deduced.
3815 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
3816 const LandingPadInfo *LandingPad = LandingPads[i];
3817 for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
3818 unsigned BeginLabel = LandingPad->BeginLabels[j];
3819 assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
3820 PadRange P = { i, j };
3821 PadMap[BeginLabel] = P;
3825 // The end label of the previous invoke or nounwind try-range.
3826 unsigned LastLabel = 0;
3828 // Whether there is a potentially throwing instruction (currently this means
3829 // an ordinary call) between the end of the previous try-range and now.
3830 bool SawPotentiallyThrowing = false;
3832 // Whether the last callsite entry was for an invoke.
3833 bool PreviousIsInvoke = false;
3835 // Visit all instructions in order of address.
3836 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
3838 for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
3840 if (!MI->isLabel()) {
3841 SawPotentiallyThrowing |= MI->getDesc().isCall();
3845 unsigned BeginLabel = MI->getOperand(0).getImm();
3846 assert(BeginLabel && "Invalid label!");
3848 // End of the previous try-range?
3849 if (BeginLabel == LastLabel)
3850 SawPotentiallyThrowing = false;
3852 // Beginning of a new try-range?
3853 RangeMapType::iterator L = PadMap.find(BeginLabel);
3854 if (L == PadMap.end())
3855 // Nope, it was just some random label.
3858 PadRange P = L->second;
3859 const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
3861 assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
3862 "Inconsistent landing pad map!");
3864 // If some instruction between the previous try-range and this one may
3865 // throw, create a call-site entry with no landing pad for the region
3866 // between the try-ranges.
3867 if (SawPotentiallyThrowing) {
3868 CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
3869 CallSites.push_back(Site);
3870 PreviousIsInvoke = false;
3873 LastLabel = LandingPad->EndLabels[P.RangeIndex];
3874 assert(BeginLabel && LastLabel && "Invalid landing pad!");
3876 if (LandingPad->LandingPadLabel) {
3877 // This try-range is for an invoke.
3878 CallSiteEntry Site = {BeginLabel, LastLabel,
3879 LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
3881 // Try to merge with the previous call-site.
3882 if (PreviousIsInvoke) {
3883 CallSiteEntry &Prev = CallSites.back();
3884 if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
3885 // Extend the range of the previous entry.
3886 Prev.EndLabel = Site.EndLabel;
3891 // Otherwise, create a new call-site.
3892 CallSites.push_back(Site);
3893 PreviousIsInvoke = true;
3896 PreviousIsInvoke = false;
3900 // If some instruction between the previous try-range and the end of the
3901 // function may throw, create a call-site entry with no landing pad for the
3902 // region following the try-range.
3903 if (SawPotentiallyThrowing) {
3904 CallSiteEntry Site = {LastLabel, 0, 0, 0};
3905 CallSites.push_back(Site);
3911 const unsigned SiteStartSize = sizeof(int32_t); // DW_EH_PE_udata4
3912 const unsigned SiteLengthSize = sizeof(int32_t); // DW_EH_PE_udata4
3913 const unsigned LandingPadSize = sizeof(int32_t); // DW_EH_PE_udata4
3914 unsigned SizeSites = CallSites.size() * (SiteStartSize +
3917 for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
3918 SizeSites += TargetAsmInfo::getULEB128Size(CallSites[i].Action);
3921 const unsigned TypeInfoSize = TD->getPointerSize(); // DW_EH_PE_absptr
3922 unsigned SizeTypes = TypeInfos.size() * TypeInfoSize;
3924 unsigned TypeOffset = sizeof(int8_t) + // Call site format
3925 TargetAsmInfo::getULEB128Size(SizeSites) + // Call-site table length
3926 SizeSites + SizeActions + SizeTypes;
3928 unsigned TotalSize = sizeof(int8_t) + // LPStart format
3929 sizeof(int8_t) + // TType format
3930 TargetAsmInfo::getULEB128Size(TypeOffset) + // TType base offset
3933 unsigned SizeAlign = (4 - TotalSize) & 3;
3935 // Begin the exception table.
3936 Asm->SwitchToDataSection(TAI->getDwarfExceptionSection());
3937 Asm->EmitAlignment(2, 0, 0, false);
3938 O << "GCC_except_table" << SubprogramCount << ":\n";
3939 for (unsigned i = 0; i != SizeAlign; ++i) {
3941 Asm->EOL("Padding");
3943 EmitLabel("exception", SubprogramCount);
3946 Asm->EmitInt8(DW_EH_PE_omit);
3947 Asm->EOL("LPStart format (DW_EH_PE_omit)");
3948 Asm->EmitInt8(DW_EH_PE_absptr);
3949 Asm->EOL("TType format (DW_EH_PE_absptr)");
3950 Asm->EmitULEB128Bytes(TypeOffset);
3951 Asm->EOL("TType base offset");
3952 Asm->EmitInt8(DW_EH_PE_udata4);
3953 Asm->EOL("Call site format (DW_EH_PE_udata4)");
3954 Asm->EmitULEB128Bytes(SizeSites);
3955 Asm->EOL("Call-site table length");
3957 // Emit the landing pad site information.
3958 for (unsigned i = 0; i < CallSites.size(); ++i) {
3959 CallSiteEntry &S = CallSites[i];
3960 const char *BeginTag;
3961 unsigned BeginNumber;
3963 if (!S.BeginLabel) {
3964 BeginTag = "eh_func_begin";
3965 BeginNumber = SubprogramCount;
3968 BeginNumber = S.BeginLabel;
3971 EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount,
3973 Asm->EOL("Region start");
3976 EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber,
3979 EmitDifference("label", S.EndLabel, BeginTag, BeginNumber, true);
3981 Asm->EOL("Region length");
3986 EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount,
3988 Asm->EOL("Landing pad");
3990 Asm->EmitULEB128Bytes(S.Action);
3994 // Emit the actions.
3995 for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
3996 ActionEntry &Action = Actions[I];
3998 Asm->EmitSLEB128Bytes(Action.ValueForTypeID);
3999 Asm->EOL("TypeInfo index");
4000 Asm->EmitSLEB128Bytes(Action.NextAction);
4001 Asm->EOL("Next action");
4004 // Emit the type ids.
4005 for (unsigned M = TypeInfos.size(); M; --M) {
4006 GlobalVariable *GV = TypeInfos[M - 1];
4008 PrintRelDirective();
4011 O << Asm->getGlobalLinkName(GV);
4015 Asm->EOL("TypeInfo");
4018 // Emit the filter typeids.
4019 for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
4020 unsigned TypeID = FilterIds[j];
4021 Asm->EmitULEB128Bytes(TypeID);
4022 Asm->EOL("Filter TypeInfo index");
4025 Asm->EmitAlignment(2, 0, 0, false);
4029 //===--------------------------------------------------------------------===//
4030 // Main entry points.
4032 DwarfException(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
4033 : Dwarf(OS, A, T, "eh"), shouldEmitTable(false), shouldEmitMoves(false),
4034 shouldEmitTableModule(false), shouldEmitMovesModule(false),
4036 if (TimePassesIsEnabled)
4037 ExceptionTimer = new Timer("Dwarf Exception Writer",
4038 getDwarfTimerGroup());
4041 virtual ~DwarfException() {
4042 delete ExceptionTimer;
4045 /// SetModuleInfo - Set machine module information when it's known that pass
4046 /// manager has created it. Set by the target AsmPrinter.
4047 void SetModuleInfo(MachineModuleInfo *mmi) {
4051 /// BeginModule - Emit all exception information that should come prior to the
4053 void BeginModule(Module *M) {
4057 /// EndModule - Emit all exception information that should come after the
4060 if (TimePassesIsEnabled)
4061 ExceptionTimer->startTimer();
4063 if (shouldEmitMovesModule || shouldEmitTableModule) {
4064 const std::vector<Function *> Personalities = MMI->getPersonalities();
4065 for (unsigned i = 0; i < Personalities.size(); ++i)
4066 EmitCommonEHFrame(Personalities[i], i);
4068 for (std::vector<FunctionEHFrameInfo>::iterator I = EHFrames.begin(),
4069 E = EHFrames.end(); I != E; ++I)
4073 if (TimePassesIsEnabled)
4074 ExceptionTimer->stopTimer();
4077 /// BeginFunction - Gather pre-function exception information. Assumes being
4078 /// emitted immediately after the function entry point.
4079 void BeginFunction(MachineFunction *MF) {
4080 if (TimePassesIsEnabled)
4081 ExceptionTimer->startTimer();
4084 shouldEmitTable = shouldEmitMoves = false;
4086 if (MMI && TAI->doesSupportExceptionHandling()) {
4087 // Map all labels and get rid of any dead landing pads.
4088 MMI->TidyLandingPads();
4090 // If any landing pads survive, we need an EH table.
4091 if (MMI->getLandingPads().size())
4092 shouldEmitTable = true;
4094 // See if we need frame move info.
4095 if (!MF->getFunction()->doesNotThrow() || UnwindTablesMandatory)
4096 shouldEmitMoves = true;
4098 if (shouldEmitMoves || shouldEmitTable)
4099 // Assumes in correct section after the entry point.
4100 EmitLabel("eh_func_begin", ++SubprogramCount);
4103 shouldEmitTableModule |= shouldEmitTable;
4104 shouldEmitMovesModule |= shouldEmitMoves;
4106 if (TimePassesIsEnabled)
4107 ExceptionTimer->stopTimer();
4110 /// EndFunction - Gather and emit post-function exception information.
4112 void EndFunction() {
4113 if (TimePassesIsEnabled)
4114 ExceptionTimer->startTimer();
4116 if (shouldEmitMoves || shouldEmitTable) {
4117 EmitLabel("eh_func_end", SubprogramCount);
4118 EmitExceptionTable();
4120 // Save EH frame information
4122 push_back(FunctionEHFrameInfo(getAsm()->getCurrentFunctionEHName(MF),
4124 MMI->getPersonalityIndex(),
4125 MF->getFrameInfo()->hasCalls(),
4126 !MMI->getLandingPads().empty(),
4127 MMI->getFrameMoves(),
4128 MF->getFunction()));
4131 if (TimePassesIsEnabled)
4132 ExceptionTimer->stopTimer();
4136 } // End of namespace llvm
4138 //===----------------------------------------------------------------------===//
4140 /// Emit - Print the abbreviation using the specified Dwarf writer.
4142 void DIEAbbrev::Emit(const DwarfDebug &DD) const {
4143 // Emit its Dwarf tag type.
4144 DD.getAsm()->EmitULEB128Bytes(Tag);
4145 DD.getAsm()->EOL(TagString(Tag));
4147 // Emit whether it has children DIEs.
4148 DD.getAsm()->EmitULEB128Bytes(ChildrenFlag);
4149 DD.getAsm()->EOL(ChildrenString(ChildrenFlag));
4151 // For each attribute description.
4152 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4153 const DIEAbbrevData &AttrData = Data[i];
4155 // Emit attribute type.
4156 DD.getAsm()->EmitULEB128Bytes(AttrData.getAttribute());
4157 DD.getAsm()->EOL(AttributeString(AttrData.getAttribute()));
4160 DD.getAsm()->EmitULEB128Bytes(AttrData.getForm());
4161 DD.getAsm()->EOL(FormEncodingString(AttrData.getForm()));
4164 // Mark end of abbreviation.
4165 DD.getAsm()->EmitULEB128Bytes(0); DD.getAsm()->EOL("EOM(1)");
4166 DD.getAsm()->EmitULEB128Bytes(0); DD.getAsm()->EOL("EOM(2)");
4170 void DIEAbbrev::print(std::ostream &O) {
4171 O << "Abbreviation @"
4172 << std::hex << (intptr_t)this << std::dec
4176 << ChildrenString(ChildrenFlag)
4179 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4181 << AttributeString(Data[i].getAttribute())
4183 << FormEncodingString(Data[i].getForm())
4187 void DIEAbbrev::dump() { print(cerr); }
4190 //===----------------------------------------------------------------------===//
4193 void DIEValue::dump() {
4198 //===----------------------------------------------------------------------===//
4200 /// EmitValue - Emit integer of appropriate size.
4202 void DIEInteger::EmitValue(DwarfDebug &DD, unsigned Form) {
4204 case DW_FORM_flag: // Fall thru
4205 case DW_FORM_ref1: // Fall thru
4206 case DW_FORM_data1: DD.getAsm()->EmitInt8(Integer); break;
4207 case DW_FORM_ref2: // Fall thru
4208 case DW_FORM_data2: DD.getAsm()->EmitInt16(Integer); break;
4209 case DW_FORM_ref4: // Fall thru
4210 case DW_FORM_data4: DD.getAsm()->EmitInt32(Integer); break;
4211 case DW_FORM_ref8: // Fall thru
4212 case DW_FORM_data8: DD.getAsm()->EmitInt64(Integer); break;
4213 case DW_FORM_udata: DD.getAsm()->EmitULEB128Bytes(Integer); break;
4214 case DW_FORM_sdata: DD.getAsm()->EmitSLEB128Bytes(Integer); break;
4215 default: assert(0 && "DIE Value form not supported yet"); break;
4219 /// SizeOf - Determine size of integer value in bytes.
4221 unsigned DIEInteger::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4223 case DW_FORM_flag: // Fall thru
4224 case DW_FORM_ref1: // Fall thru
4225 case DW_FORM_data1: return sizeof(int8_t);
4226 case DW_FORM_ref2: // Fall thru
4227 case DW_FORM_data2: return sizeof(int16_t);
4228 case DW_FORM_ref4: // Fall thru
4229 case DW_FORM_data4: return sizeof(int32_t);
4230 case DW_FORM_ref8: // Fall thru
4231 case DW_FORM_data8: return sizeof(int64_t);
4232 case DW_FORM_udata: return TargetAsmInfo::getULEB128Size(Integer);
4233 case DW_FORM_sdata: return TargetAsmInfo::getSLEB128Size(Integer);
4234 default: assert(0 && "DIE Value form not supported yet"); break;
4239 //===----------------------------------------------------------------------===//
4241 /// EmitValue - Emit string value.
4243 void DIEString::EmitValue(DwarfDebug &DD, unsigned Form) {
4244 DD.getAsm()->EmitString(Str);
4247 //===----------------------------------------------------------------------===//
4249 /// EmitValue - Emit label value.
4251 void DIEDwarfLabel::EmitValue(DwarfDebug &DD, unsigned Form) {
4252 bool IsSmall = Form == DW_FORM_data4;
4253 DD.EmitReference(Label, false, IsSmall);
4256 /// SizeOf - Determine size of label value in bytes.
4258 unsigned DIEDwarfLabel::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4259 if (Form == DW_FORM_data4) return 4;
4260 return DD.getTargetData()->getPointerSize();
4263 //===----------------------------------------------------------------------===//
4265 /// EmitValue - Emit label value.
4267 void DIEObjectLabel::EmitValue(DwarfDebug &DD, unsigned Form) {
4268 bool IsSmall = Form == DW_FORM_data4;
4269 DD.EmitReference(Label, false, IsSmall);
4272 /// SizeOf - Determine size of label value in bytes.
4274 unsigned DIEObjectLabel::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4275 if (Form == DW_FORM_data4) return 4;
4276 return DD.getTargetData()->getPointerSize();
4279 //===----------------------------------------------------------------------===//
4281 /// EmitValue - Emit delta value.
4283 void DIESectionOffset::EmitValue(DwarfDebug &DD, unsigned Form) {
4284 bool IsSmall = Form == DW_FORM_data4;
4285 DD.EmitSectionOffset(Label.Tag, Section.Tag,
4286 Label.Number, Section.Number, IsSmall, IsEH, UseSet);
4289 /// SizeOf - Determine size of delta value in bytes.
4291 unsigned DIESectionOffset::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4292 if (Form == DW_FORM_data4) return 4;
4293 return DD.getTargetData()->getPointerSize();
4296 //===----------------------------------------------------------------------===//
4298 /// EmitValue - Emit delta value.
4300 void DIEDelta::EmitValue(DwarfDebug &DD, unsigned Form) {
4301 bool IsSmall = Form == DW_FORM_data4;
4302 DD.EmitDifference(LabelHi, LabelLo, IsSmall);
4305 /// SizeOf - Determine size of delta value in bytes.
4307 unsigned DIEDelta::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4308 if (Form == DW_FORM_data4) return 4;
4309 return DD.getTargetData()->getPointerSize();
4312 //===----------------------------------------------------------------------===//
4314 /// EmitValue - Emit debug information entry offset.
4316 void DIEntry::EmitValue(DwarfDebug &DD, unsigned Form) {
4317 DD.getAsm()->EmitInt32(Entry->getOffset());
4320 //===----------------------------------------------------------------------===//
4322 /// ComputeSize - calculate the size of the block.
4324 unsigned DIEBlock::ComputeSize(DwarfDebug &DD) {
4326 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
4328 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
4329 Size += Values[i]->SizeOf(DD, AbbrevData[i].getForm());
4335 /// EmitValue - Emit block data.
4337 void DIEBlock::EmitValue(DwarfDebug &DD, unsigned Form) {
4339 case DW_FORM_block1: DD.getAsm()->EmitInt8(Size); break;
4340 case DW_FORM_block2: DD.getAsm()->EmitInt16(Size); break;
4341 case DW_FORM_block4: DD.getAsm()->EmitInt32(Size); break;
4342 case DW_FORM_block: DD.getAsm()->EmitULEB128Bytes(Size); break;
4343 default: assert(0 && "Improper form for block"); break;
4346 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
4348 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
4350 Values[i]->EmitValue(DD, AbbrevData[i].getForm());
4354 /// SizeOf - Determine size of block data in bytes.
4356 unsigned DIEBlock::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4358 case DW_FORM_block1: return Size + sizeof(int8_t);
4359 case DW_FORM_block2: return Size + sizeof(int16_t);
4360 case DW_FORM_block4: return Size + sizeof(int32_t);
4361 case DW_FORM_block: return Size + TargetAsmInfo::getULEB128Size(Size);
4362 default: assert(0 && "Improper form for block"); break;
4367 //===----------------------------------------------------------------------===//
4368 /// DIE Implementation
4371 for (unsigned i = 0, N = Children.size(); i < N; ++i)
4375 /// AddSiblingOffset - Add a sibling offset field to the front of the DIE.
4377 void DIE::AddSiblingOffset() {
4378 DIEInteger *DI = new DIEInteger(0);
4379 Values.insert(Values.begin(), DI);
4380 Abbrev.AddFirstAttribute(DW_AT_sibling, DW_FORM_ref4);
4383 /// Profile - Used to gather unique data for the value folding set.
4385 void DIE::Profile(FoldingSetNodeID &ID) {
4388 for (unsigned i = 0, N = Children.size(); i < N; ++i)
4389 ID.AddPointer(Children[i]);
4391 for (unsigned j = 0, M = Values.size(); j < M; ++j)
4392 ID.AddPointer(Values[j]);
4396 void DIE::print(std::ostream &O, unsigned IncIndent) {
4397 static unsigned IndentCount = 0;
4398 IndentCount += IncIndent;
4399 const std::string Indent(IndentCount, ' ');
4400 bool isBlock = Abbrev.getTag() == 0;
4405 << "0x" << std::hex << (intptr_t)this << std::dec
4406 << ", Offset: " << Offset
4407 << ", Size: " << Size
4411 << TagString(Abbrev.getTag())
4413 << ChildrenString(Abbrev.getChildrenFlag());
4415 O << "Size: " << Size;
4419 const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData();
4422 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4426 O << AttributeString(Data[i].getAttribute());
4428 O << "Blk[" << i << "]";
4431 << FormEncodingString(Data[i].getForm())
4433 Values[i]->print(O);
4438 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
4439 Children[j]->print(O, 4);
4442 if (!isBlock) O << "\n";
4443 IndentCount -= IncIndent;
4451 //===----------------------------------------------------------------------===//
4452 /// DwarfWriter Implementation
4455 DwarfWriter::DwarfWriter()
4456 : ImmutablePass(&ID), DD(0), DE(0) {}
4458 DwarfWriter::~DwarfWriter() {
4463 /// BeginModule - Emit all Dwarf sections that should come prior to the
4465 void DwarfWriter::BeginModule(Module *M,
4466 MachineModuleInfo *MMI,
4467 raw_ostream &OS, AsmPrinter *A,
4468 const TargetAsmInfo *T) {
4469 DE = new DwarfException(OS, A, T);
4470 DD = new DwarfDebug(OS, A, T);
4473 DD->SetDebugInfo(MMI);
4474 DE->SetModuleInfo(MMI);
4477 /// EndModule - Emit all Dwarf sections that should come after the content.
4479 void DwarfWriter::EndModule() {
4484 /// BeginFunction - Gather pre-function debug information. Assumes being
4485 /// emitted immediately after the function entry point.
4486 void DwarfWriter::BeginFunction(MachineFunction *MF) {
4487 DE->BeginFunction(MF);
4488 DD->BeginFunction(MF);
4491 /// EndFunction - Gather and emit post-function debug information.
4493 void DwarfWriter::EndFunction(MachineFunction *MF) {
4494 DD->EndFunction(MF);
4497 if (MachineModuleInfo *MMI = DD->getMMI() ? DD->getMMI() : DE->getMMI())
4498 // Clear function debug information.
4502 /// ValidDebugInfo - Return true if V represents valid debug info value.
4503 bool DwarfWriter::ValidDebugInfo(Value *V) {
4504 return DD && DD->ValidDebugInfo(V);
4507 /// RecordSourceLine - Records location information and associates it with a
4508 /// label. Returns a unique label ID used to generate a label and provide
4509 /// correspondence to the source line list.
4510 unsigned DwarfWriter::RecordSourceLine(unsigned Line, unsigned Col,
4512 return DD->RecordSourceLine(Line, Col, Src);
4515 /// getOrCreateSourceID - Look up the source id with the given directory and
4516 /// source file names. If none currently exists, create a new id and insert it
4517 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
4519 unsigned DwarfWriter::getOrCreateSourceID(const std::string &DirName,
4520 const std::string &FileName) {
4521 return DD->getOrCreateSourceID(DirName, FileName);
4524 /// RecordRegionStart - Indicate the start of a region.
4525 unsigned DwarfWriter::RecordRegionStart(GlobalVariable *V) {
4526 return DD->RecordRegionStart(V);
4529 /// RecordRegionEnd - Indicate the end of a region.
4530 unsigned DwarfWriter::RecordRegionEnd(GlobalVariable *V) {
4531 return DD->RecordRegionEnd(V);
4534 /// getRecordSourceLineCount - Count source lines.
4535 unsigned DwarfWriter::getRecordSourceLineCount() {
4536 return DD->getRecordSourceLineCount();
4539 /// RecordVariable - Indicate the declaration of a local variable.
4541 void DwarfWriter::RecordVariable(GlobalVariable *GV, unsigned FrameIndex) {
4542 DD->RecordVariable(GV, FrameIndex);
4545 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
4547 bool DwarfWriter::ShouldEmitDwarfDebug() const {
4548 return DD->ShouldEmitDwarfDebug();