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;
53 static TimerGroup *DwarfTimerGroup = 0;
54 static TimerGroup *getDwarfTimerGroup() {
55 if (DwarfTimerGroup) return DwarfTimerGroup;
56 return DwarfTimerGroup = new TimerGroup("Dwarf Exception and Debugging");
59 } // end anonymous namespace
63 //===----------------------------------------------------------------------===//
65 /// Configuration values for initial hash set sizes (log2).
67 static const unsigned InitDiesSetSize = 9; // log2(512)
68 static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
69 static const unsigned InitValuesSetSize = 9; // log2(512)
71 //===----------------------------------------------------------------------===//
72 /// Forward declarations.
77 //===----------------------------------------------------------------------===//
80 /// getGlobalVariable - Return either a direct or cast Global value.
82 static GlobalVariable *getGlobalVariable(Value *V) {
83 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
85 } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
86 if (CE->getOpcode() == Instruction::BitCast) {
87 return dyn_cast<GlobalVariable>(CE->getOperand(0));
88 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
89 for (unsigned int i=1; i<CE->getNumOperands(); i++) {
90 if (!CE->getOperand(i)->isNullValue())
93 return dyn_cast<GlobalVariable>(CE->getOperand(0));
99 //===----------------------------------------------------------------------===//
100 /// DWLabel - Labels are used to track locations in the assembler file.
101 /// Labels appear in the form @verbatim <prefix><Tag><Number> @endverbatim,
102 /// where the tag is a category of label (Ex. location) and number is a value
103 /// unique in that category.
106 /// Tag - Label category tag. Should always be a staticly declared C string.
110 /// Number - Value to make label unique.
114 DWLabel(const char *T, unsigned N) : Tag(T), Number(N) {}
116 void Profile(FoldingSetNodeID &ID) const {
118 ID.AddInteger(Number);
122 void print(std::ostream *O) const {
125 void print(std::ostream &O) const {
127 if (Number) O << Number;
132 //===----------------------------------------------------------------------===//
133 /// DIEAbbrevData - Dwarf abbreviation data, describes the one attribute of a
134 /// Dwarf abbreviation.
135 class DIEAbbrevData {
137 /// Attribute - Dwarf attribute code.
141 /// Form - Dwarf form code.
146 DIEAbbrevData(unsigned A, unsigned F)
152 unsigned getAttribute() const { return Attribute; }
153 unsigned getForm() const { return Form; }
155 /// Profile - Used to gather unique data for the abbreviation folding set.
157 void Profile(FoldingSetNodeID &ID)const {
158 ID.AddInteger(Attribute);
163 //===----------------------------------------------------------------------===//
164 /// DIEAbbrev - Dwarf abbreviation, describes the organization of a debug
165 /// information object.
166 class DIEAbbrev : public FoldingSetNode {
168 /// Tag - Dwarf tag code.
172 /// Unique number for node.
176 /// ChildrenFlag - Dwarf children flag.
178 unsigned ChildrenFlag;
180 /// Data - Raw data bytes for abbreviation.
182 SmallVector<DIEAbbrevData, 8> Data;
186 DIEAbbrev(unsigned T, unsigned C)
194 unsigned getTag() const { return Tag; }
195 unsigned getNumber() const { return Number; }
196 unsigned getChildrenFlag() const { return ChildrenFlag; }
197 const SmallVector<DIEAbbrevData, 8> &getData() const { return Data; }
198 void setTag(unsigned T) { Tag = T; }
199 void setChildrenFlag(unsigned CF) { ChildrenFlag = CF; }
200 void setNumber(unsigned N) { Number = N; }
202 /// AddAttribute - Adds another set of attribute information to the
204 void AddAttribute(unsigned Attribute, unsigned Form) {
205 Data.push_back(DIEAbbrevData(Attribute, Form));
208 /// AddFirstAttribute - Adds a set of attribute information to the front
209 /// of the abbreviation.
210 void AddFirstAttribute(unsigned Attribute, unsigned Form) {
211 Data.insert(Data.begin(), DIEAbbrevData(Attribute, Form));
214 /// Profile - Used to gather unique data for the abbreviation folding set.
216 void Profile(FoldingSetNodeID &ID) {
218 ID.AddInteger(ChildrenFlag);
220 // For each attribute description.
221 for (unsigned i = 0, N = Data.size(); i < N; ++i)
225 /// Emit - Print the abbreviation using the specified Dwarf writer.
227 void Emit(const DwarfDebug &DD) const;
230 void print(std::ostream *O) {
233 void print(std::ostream &O);
238 //===----------------------------------------------------------------------===//
239 /// DIE - A structured debug information entry. Has an abbreviation which
240 /// describes it's organization.
241 class DIE : public FoldingSetNode {
243 /// Abbrev - Buffer for constructing abbreviation.
247 /// Offset - Offset in debug info section.
251 /// Size - Size of instance + children.
257 std::vector<DIE *> Children;
259 /// Attributes values.
261 SmallVector<DIEValue*, 32> Values;
264 explicit DIE(unsigned Tag)
265 : Abbrev(Tag, DW_CHILDREN_no)
274 DIEAbbrev &getAbbrev() { return Abbrev; }
275 unsigned getAbbrevNumber() const {
276 return Abbrev.getNumber();
278 unsigned getTag() const { return Abbrev.getTag(); }
279 unsigned getOffset() const { return Offset; }
280 unsigned getSize() const { return Size; }
281 const std::vector<DIE *> &getChildren() const { return Children; }
282 SmallVector<DIEValue*, 32> &getValues() { return Values; }
283 void setTag(unsigned Tag) { Abbrev.setTag(Tag); }
284 void setOffset(unsigned O) { Offset = O; }
285 void setSize(unsigned S) { Size = S; }
287 /// AddValue - Add a value and attributes to a DIE.
289 void AddValue(unsigned Attribute, unsigned Form, DIEValue *Value) {
290 Abbrev.AddAttribute(Attribute, Form);
291 Values.push_back(Value);
294 /// SiblingOffset - Return the offset of the debug information entry's
296 unsigned SiblingOffset() const { return Offset + Size; }
298 /// AddSiblingOffset - Add a sibling offset field to the front of the DIE.
300 void AddSiblingOffset();
302 /// AddChild - Add a child to the DIE.
304 void AddChild(DIE *Child) {
305 Abbrev.setChildrenFlag(DW_CHILDREN_yes);
306 Children.push_back(Child);
309 /// Detach - Detaches objects connected to it after copying.
315 /// Profile - Used to gather unique data for the value folding set.
317 void Profile(FoldingSetNodeID &ID) ;
320 void print(std::ostream *O, unsigned IncIndent = 0) {
321 if (O) print(*O, IncIndent);
323 void print(std::ostream &O, unsigned IncIndent = 0);
328 //===----------------------------------------------------------------------===//
329 /// DIEValue - A debug information entry value.
331 class DIEValue : public FoldingSetNode {
344 /// Type - Type of data stored in the value.
348 explicit DIEValue(unsigned T)
351 virtual ~DIEValue() {}
354 unsigned getType() const { return Type; }
356 // Implement isa/cast/dyncast.
357 static bool classof(const DIEValue *) { return true; }
359 /// EmitValue - Emit value via the Dwarf writer.
361 virtual void EmitValue(DwarfDebug &DD, unsigned Form) = 0;
363 /// SizeOf - Return the size of a value in bytes.
365 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const = 0;
367 /// Profile - Used to gather unique data for the value folding set.
369 virtual void Profile(FoldingSetNodeID &ID) = 0;
372 void print(std::ostream *O) {
375 virtual void print(std::ostream &O) = 0;
380 //===----------------------------------------------------------------------===//
381 /// DWInteger - An integer value DIE.
383 class DIEInteger : public DIEValue {
388 explicit DIEInteger(uint64_t I) : DIEValue(isInteger), Integer(I) {}
390 // Implement isa/cast/dyncast.
391 static bool classof(const DIEInteger *) { return true; }
392 static bool classof(const DIEValue *I) { return I->Type == isInteger; }
394 /// BestForm - Choose the best form for integer.
396 static unsigned BestForm(bool IsSigned, uint64_t Integer) {
398 if ((char)Integer == (signed)Integer) return DW_FORM_data1;
399 if ((short)Integer == (signed)Integer) return DW_FORM_data2;
400 if ((int)Integer == (signed)Integer) return DW_FORM_data4;
402 if ((unsigned char)Integer == Integer) return DW_FORM_data1;
403 if ((unsigned short)Integer == Integer) return DW_FORM_data2;
404 if ((unsigned int)Integer == Integer) return DW_FORM_data4;
406 return DW_FORM_data8;
409 /// EmitValue - Emit integer of appropriate size.
411 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
413 /// SizeOf - Determine size of integer value in bytes.
415 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
417 /// Profile - Used to gather unique data for the value folding set.
419 static void Profile(FoldingSetNodeID &ID, unsigned Integer) {
420 ID.AddInteger(isInteger);
421 ID.AddInteger(Integer);
423 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Integer); }
426 virtual void print(std::ostream &O) {
427 O << "Int: " << (int64_t)Integer
428 << " 0x" << std::hex << Integer << std::dec;
433 //===----------------------------------------------------------------------===//
434 /// DIEString - A string value DIE.
436 class DIEString : public DIEValue {
438 const std::string String;
440 explicit DIEString(const std::string &S) : DIEValue(isString), String(S) {}
442 // Implement isa/cast/dyncast.
443 static bool classof(const DIEString *) { return true; }
444 static bool classof(const DIEValue *S) { return S->Type == isString; }
446 /// EmitValue - Emit string value.
448 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
450 /// SizeOf - Determine size of string value in bytes.
452 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const {
453 return String.size() + sizeof(char); // sizeof('\0');
456 /// Profile - Used to gather unique data for the value folding set.
458 static void Profile(FoldingSetNodeID &ID, const std::string &String) {
459 ID.AddInteger(isString);
460 ID.AddString(String);
462 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, String); }
465 virtual void print(std::ostream &O) {
466 O << "Str: \"" << String << "\"";
471 //===----------------------------------------------------------------------===//
472 /// DIEDwarfLabel - A Dwarf internal label expression DIE.
474 class DIEDwarfLabel : public DIEValue {
479 explicit DIEDwarfLabel(const DWLabel &L) : DIEValue(isLabel), Label(L) {}
481 // Implement isa/cast/dyncast.
482 static bool classof(const DIEDwarfLabel *) { return true; }
483 static bool classof(const DIEValue *L) { return L->Type == isLabel; }
485 /// EmitValue - Emit label value.
487 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
489 /// SizeOf - Determine size of label value in bytes.
491 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
493 /// Profile - Used to gather unique data for the value folding set.
495 static void Profile(FoldingSetNodeID &ID, const DWLabel &Label) {
496 ID.AddInteger(isLabel);
499 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label); }
502 virtual void print(std::ostream &O) {
510 //===----------------------------------------------------------------------===//
511 /// DIEObjectLabel - A label to an object in code or data.
513 class DIEObjectLabel : public DIEValue {
515 const std::string Label;
517 explicit DIEObjectLabel(const std::string &L)
518 : DIEValue(isAsIsLabel), Label(L) {}
520 // Implement isa/cast/dyncast.
521 static bool classof(const DIEObjectLabel *) { return true; }
522 static bool classof(const DIEValue *L) { return L->Type == isAsIsLabel; }
524 /// EmitValue - Emit label value.
526 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
528 /// SizeOf - Determine size of label value in bytes.
530 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
532 /// Profile - Used to gather unique data for the value folding set.
534 static void Profile(FoldingSetNodeID &ID, const std::string &Label) {
535 ID.AddInteger(isAsIsLabel);
538 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label.c_str()); }
541 virtual void print(std::ostream &O) {
542 O << "Obj: " << Label;
547 //===----------------------------------------------------------------------===//
548 /// DIESectionOffset - A section offset DIE.
550 class DIESectionOffset : public DIEValue {
553 const DWLabel Section;
557 DIESectionOffset(const DWLabel &Lab, const DWLabel &Sec,
558 bool isEH = false, bool useSet = true)
559 : DIEValue(isSectionOffset), Label(Lab), Section(Sec),
560 IsEH(isEH), UseSet(useSet) {}
562 // Implement isa/cast/dyncast.
563 static bool classof(const DIESectionOffset *) { return true; }
564 static bool classof(const DIEValue *D) { return D->Type == isSectionOffset; }
566 /// EmitValue - Emit section offset.
568 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
570 /// SizeOf - Determine size of section offset value in bytes.
572 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
574 /// Profile - Used to gather unique data for the value folding set.
576 static void Profile(FoldingSetNodeID &ID, const DWLabel &Label,
577 const DWLabel &Section) {
578 ID.AddInteger(isSectionOffset);
581 // IsEH and UseSet are specific to the Label/Section that we will emit
582 // the offset for; so Label/Section are enough for uniqueness.
584 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, Label, Section); }
587 virtual void print(std::ostream &O) {
592 O << "-" << IsEH << "-" << UseSet;
597 //===----------------------------------------------------------------------===//
598 /// DIEDelta - A simple label difference DIE.
600 class DIEDelta : public DIEValue {
602 const DWLabel LabelHi;
603 const DWLabel LabelLo;
605 DIEDelta(const DWLabel &Hi, const DWLabel &Lo)
606 : DIEValue(isDelta), LabelHi(Hi), LabelLo(Lo) {}
608 // Implement isa/cast/dyncast.
609 static bool classof(const DIEDelta *) { return true; }
610 static bool classof(const DIEValue *D) { return D->Type == isDelta; }
612 /// EmitValue - Emit delta value.
614 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
616 /// SizeOf - Determine size of delta value in bytes.
618 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
620 /// Profile - Used to gather unique data for the value folding set.
622 static void Profile(FoldingSetNodeID &ID, const DWLabel &LabelHi,
623 const DWLabel &LabelLo) {
624 ID.AddInteger(isDelta);
628 virtual void Profile(FoldingSetNodeID &ID) { Profile(ID, LabelHi, LabelLo); }
631 virtual void print(std::ostream &O) {
640 //===----------------------------------------------------------------------===//
641 /// DIEntry - A pointer to another debug information entry. An instance of this
642 /// class can also be used as a proxy for a debug information entry not yet
643 /// defined (ie. types.)
644 class DIEntry : public DIEValue {
648 explicit DIEntry(DIE *E) : DIEValue(isEntry), Entry(E) {}
650 // Implement isa/cast/dyncast.
651 static bool classof(const DIEntry *) { return true; }
652 static bool classof(const DIEValue *E) { return E->Type == isEntry; }
654 /// EmitValue - Emit debug information entry offset.
656 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
658 /// SizeOf - Determine size of debug information entry in bytes.
660 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const {
661 return sizeof(int32_t);
664 /// Profile - Used to gather unique data for the value folding set.
666 static void Profile(FoldingSetNodeID &ID, DIE *Entry) {
667 ID.AddInteger(isEntry);
668 ID.AddPointer(Entry);
670 virtual void Profile(FoldingSetNodeID &ID) {
671 ID.AddInteger(isEntry);
674 ID.AddPointer(Entry);
681 virtual void print(std::ostream &O) {
682 O << "Die: 0x" << std::hex << (intptr_t)Entry << std::dec;
687 //===----------------------------------------------------------------------===//
688 /// DIEBlock - A block of values. Primarily used for location expressions.
690 class DIEBlock : public DIEValue, public DIE {
692 unsigned Size; // Size in bytes excluding size header.
702 // Implement isa/cast/dyncast.
703 static bool classof(const DIEBlock *) { return true; }
704 static bool classof(const DIEValue *E) { return E->Type == isBlock; }
706 /// ComputeSize - calculate the size of the block.
708 unsigned ComputeSize(DwarfDebug &DD);
710 /// BestForm - Choose the best form for data.
712 unsigned BestForm() const {
713 if ((unsigned char)Size == Size) return DW_FORM_block1;
714 if ((unsigned short)Size == Size) return DW_FORM_block2;
715 if ((unsigned int)Size == Size) return DW_FORM_block4;
716 return DW_FORM_block;
719 /// EmitValue - Emit block data.
721 virtual void EmitValue(DwarfDebug &DD, unsigned Form);
723 /// SizeOf - Determine size of block data in bytes.
725 virtual unsigned SizeOf(const DwarfDebug &DD, unsigned Form) const;
728 /// Profile - Used to gather unique data for the value folding set.
730 virtual void Profile(FoldingSetNodeID &ID) {
731 ID.AddInteger(isBlock);
736 virtual void print(std::ostream &O) {
743 //===----------------------------------------------------------------------===//
744 /// CompileUnit - This dwarf writer support class manages information associate
745 /// with a source file.
748 /// ID - File identifier for source.
752 /// Die - Compile unit debug information entry.
756 /// GVToDieMap - Tracks the mapping of unit level debug informaton
757 /// variables to debug information entries.
758 std::map<GlobalVariable *, DIE *> GVToDieMap;
760 /// GVToDIEntryMap - Tracks the mapping of unit level debug informaton
761 /// descriptors to debug information entries using a DIEntry proxy.
762 std::map<GlobalVariable *, DIEntry *> GVToDIEntryMap;
764 /// Globals - A map of globally visible named entities for this unit.
766 std::map<std::string, DIE *> Globals;
768 /// DiesSet - Used to uniquely define dies within the compile unit.
770 FoldingSet<DIE> DiesSet;
773 CompileUnit(unsigned I, DIE *D)
774 : ID(I), Die(D), GVToDieMap(),
775 GVToDIEntryMap(), Globals(), DiesSet(InitDiesSetSize)
783 unsigned getID() const { return ID; }
784 DIE* getDie() const { return Die; }
785 std::map<std::string, DIE *> &getGlobals() { return Globals; }
787 /// hasContent - Return true if this compile unit has something to write out.
789 bool hasContent() const {
790 return !Die->getChildren().empty();
793 /// AddGlobal - Add a new global entity to the compile unit.
795 void AddGlobal(const std::string &Name, DIE *Die) {
799 /// getDieMapSlotFor - Returns the debug information entry map slot for the
800 /// specified debug variable.
801 DIE *&getDieMapSlotFor(GlobalVariable *GV) {
802 return GVToDieMap[GV];
805 /// getDIEntrySlotFor - Returns the debug information entry proxy slot for the
806 /// specified debug variable.
807 DIEntry *&getDIEntrySlotFor(GlobalVariable *GV) {
808 return GVToDIEntryMap[GV];
811 /// AddDie - Adds or interns the DIE to the compile unit.
813 DIE *AddDie(DIE &Buffer) {
817 DIE *Die = DiesSet.FindNodeOrInsertPos(ID, Where);
820 Die = new DIE(Buffer);
821 DiesSet.InsertNode(Die, Where);
822 this->Die->AddChild(Die);
830 //===----------------------------------------------------------------------===//
831 /// Dwarf - Emits general Dwarf directives.
835 //===--------------------------------------------------------------------===//
836 // Core attributes used by the Dwarf writer.
840 /// O - Stream to .s file.
844 /// Asm - Target of Dwarf emission.
848 /// TAI - Target asm information.
849 const TargetAsmInfo *TAI;
851 /// TD - Target data.
852 const TargetData *TD;
854 /// RI - Register Information.
855 const TargetRegisterInfo *RI;
857 /// M - Current module.
861 /// MF - Current machine function.
865 /// MMI - Collected machine module information.
867 MachineModuleInfo *MMI;
869 /// SubprogramCount - The running count of functions being compiled.
871 unsigned SubprogramCount;
873 /// Flavor - A unique string indicating what dwarf producer this is, used to
875 const char * const Flavor;
878 Dwarf(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T,
883 , TD(Asm->TM.getTargetData())
884 , RI(Asm->TM.getRegisterInfo())
895 //===--------------------------------------------------------------------===//
898 AsmPrinter *getAsm() const { return Asm; }
899 MachineModuleInfo *getMMI() const { return MMI; }
900 const TargetAsmInfo *getTargetAsmInfo() const { return TAI; }
901 const TargetData *getTargetData() const { return TD; }
903 void PrintRelDirective(bool Force32Bit = false, bool isInSection = false)
905 if (isInSection && TAI->getDwarfSectionOffsetDirective())
906 O << TAI->getDwarfSectionOffsetDirective();
907 else if (Force32Bit || TD->getPointerSize() == sizeof(int32_t))
908 O << TAI->getData32bitsDirective();
910 O << TAI->getData64bitsDirective();
913 /// PrintLabelName - Print label name in form used by Dwarf writer.
915 void PrintLabelName(DWLabel Label) const {
916 PrintLabelName(Label.Tag, Label.Number);
918 void PrintLabelName(const char *Tag, unsigned Number) const {
919 O << TAI->getPrivateGlobalPrefix() << Tag;
920 if (Number) O << Number;
923 void PrintLabelName(const char *Tag, unsigned Number,
924 const char *Suffix) const {
925 O << TAI->getPrivateGlobalPrefix() << Tag;
926 if (Number) O << Number;
930 /// EmitLabel - Emit location label for internal use by Dwarf.
932 void EmitLabel(DWLabel Label) const {
933 EmitLabel(Label.Tag, Label.Number);
935 void EmitLabel(const char *Tag, unsigned Number) const {
936 PrintLabelName(Tag, Number);
940 /// EmitReference - Emit a reference to a label.
942 void EmitReference(DWLabel Label, bool IsPCRelative = false,
943 bool Force32Bit = false) const {
944 EmitReference(Label.Tag, Label.Number, IsPCRelative, Force32Bit);
946 void EmitReference(const char *Tag, unsigned Number,
947 bool IsPCRelative = false, bool Force32Bit = false) const {
948 PrintRelDirective(Force32Bit);
949 PrintLabelName(Tag, Number);
951 if (IsPCRelative) O << "-" << TAI->getPCSymbol();
953 void EmitReference(const std::string &Name, bool IsPCRelative = false,
954 bool Force32Bit = false) const {
955 PrintRelDirective(Force32Bit);
959 if (IsPCRelative) O << "-" << TAI->getPCSymbol();
962 /// EmitDifference - Emit the difference between two labels. Some
963 /// assemblers do not behave with absolute expressions with data directives,
964 /// so there is an option (needsSet) to use an intermediary set expression.
965 void EmitDifference(DWLabel LabelHi, DWLabel LabelLo,
966 bool IsSmall = false) {
967 EmitDifference(LabelHi.Tag, LabelHi.Number,
968 LabelLo.Tag, LabelLo.Number,
971 void EmitDifference(const char *TagHi, unsigned NumberHi,
972 const char *TagLo, unsigned NumberLo,
973 bool IsSmall = false) {
974 if (TAI->needsSet()) {
976 PrintLabelName("set", SetCounter, Flavor);
978 PrintLabelName(TagHi, NumberHi);
980 PrintLabelName(TagLo, NumberLo);
983 PrintRelDirective(IsSmall);
984 PrintLabelName("set", SetCounter, Flavor);
987 PrintRelDirective(IsSmall);
989 PrintLabelName(TagHi, NumberHi);
991 PrintLabelName(TagLo, NumberLo);
995 void EmitSectionOffset(const char* Label, const char* Section,
996 unsigned LabelNumber, unsigned SectionNumber,
997 bool IsSmall = false, bool isEH = false,
998 bool useSet = true) {
999 bool printAbsolute = false;
1001 printAbsolute = TAI->isAbsoluteEHSectionOffsets();
1003 printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
1005 if (TAI->needsSet() && useSet) {
1007 PrintLabelName("set", SetCounter, Flavor);
1009 PrintLabelName(Label, LabelNumber);
1011 if (!printAbsolute) {
1013 PrintLabelName(Section, SectionNumber);
1017 PrintRelDirective(IsSmall);
1019 PrintLabelName("set", SetCounter, Flavor);
1022 PrintRelDirective(IsSmall, true);
1024 PrintLabelName(Label, LabelNumber);
1026 if (!printAbsolute) {
1028 PrintLabelName(Section, SectionNumber);
1033 /// EmitFrameMoves - Emit frame instructions to describe the layout of the
1035 void EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
1036 const std::vector<MachineMove> &Moves, bool isEH) {
1038 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
1039 TargetFrameInfo::StackGrowsUp ?
1040 TD->getPointerSize() : -TD->getPointerSize();
1041 bool IsLocal = BaseLabel && strcmp(BaseLabel, "label") == 0;
1043 for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
1044 const MachineMove &Move = Moves[i];
1045 unsigned LabelID = Move.getLabelID();
1048 LabelID = MMI->MappedLabel(LabelID);
1050 // Throw out move if the label is invalid.
1051 if (!LabelID) continue;
1054 const MachineLocation &Dst = Move.getDestination();
1055 const MachineLocation &Src = Move.getSource();
1057 // Advance row if new location.
1058 if (BaseLabel && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
1059 Asm->EmitInt8(DW_CFA_advance_loc4);
1060 Asm->EOL("DW_CFA_advance_loc4");
1061 EmitDifference("label", LabelID, BaseLabel, BaseLabelID, true);
1064 BaseLabelID = LabelID;
1065 BaseLabel = "label";
1069 // If advancing cfa.
1070 if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
1072 if (Src.getReg() == MachineLocation::VirtualFP) {
1073 Asm->EmitInt8(DW_CFA_def_cfa_offset);
1074 Asm->EOL("DW_CFA_def_cfa_offset");
1076 Asm->EmitInt8(DW_CFA_def_cfa);
1077 Asm->EOL("DW_CFA_def_cfa");
1078 Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), isEH));
1079 Asm->EOL("Register");
1082 int Offset = -Src.getOffset();
1084 Asm->EmitULEB128Bytes(Offset);
1087 assert(0 && "Machine move no supported yet.");
1089 } else if (Src.isReg() &&
1090 Src.getReg() == MachineLocation::VirtualFP) {
1092 Asm->EmitInt8(DW_CFA_def_cfa_register);
1093 Asm->EOL("DW_CFA_def_cfa_register");
1094 Asm->EmitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), isEH));
1095 Asm->EOL("Register");
1097 assert(0 && "Machine move no supported yet.");
1100 unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH);
1101 int Offset = Dst.getOffset() / stackGrowth;
1104 Asm->EmitInt8(DW_CFA_offset_extended_sf);
1105 Asm->EOL("DW_CFA_offset_extended_sf");
1106 Asm->EmitULEB128Bytes(Reg);
1108 Asm->EmitSLEB128Bytes(Offset);
1110 } else if (Reg < 64) {
1111 Asm->EmitInt8(DW_CFA_offset + Reg);
1113 Asm->EOL("DW_CFA_offset + Reg (" + utostr(Reg) + ")");
1116 Asm->EmitULEB128Bytes(Offset);
1119 Asm->EmitInt8(DW_CFA_offset_extended);
1120 Asm->EOL("DW_CFA_offset_extended");
1121 Asm->EmitULEB128Bytes(Reg);
1123 Asm->EmitULEB128Bytes(Offset);
1132 //===----------------------------------------------------------------------===//
1133 /// SrcLineInfo - This class is used to record source line correspondence.
1136 unsigned Line; // Source line number.
1137 unsigned Column; // Source column.
1138 unsigned SourceID; // Source ID number.
1139 unsigned LabelID; // Label in code ID number.
1141 SrcLineInfo(unsigned L, unsigned C, unsigned S, unsigned I)
1142 : Line(L), Column(C), SourceID(S), LabelID(I) {}
1145 unsigned getLine() const { return Line; }
1146 unsigned getColumn() const { return Column; }
1147 unsigned getSourceID() const { return SourceID; }
1148 unsigned getLabelID() const { return LabelID; }
1151 //===----------------------------------------------------------------------===//
1152 /// DbgVariable - This class is used to track local variable information.
1155 DIVariable Var; // Variable Descriptor.
1156 unsigned FrameIndex; // Variable frame index.
1158 DbgVariable(DIVariable V, unsigned I) : Var(V), FrameIndex(I) {}
1161 DIVariable getVariable() const { return Var; }
1162 unsigned getFrameIndex() const { return FrameIndex; }
1165 //===----------------------------------------------------------------------===//
1166 /// DbgScope - This class is used to track scope information.
1169 DbgScope *Parent; // Parent to this scope.
1170 DIDescriptor Desc; // Debug info descriptor for scope.
1171 // Either subprogram or block.
1172 unsigned StartLabelID; // Label ID of the beginning of scope.
1173 unsigned EndLabelID; // Label ID of the end of scope.
1174 SmallVector<DbgScope *, 4> Scopes; // Scopes defined in scope.
1175 SmallVector<DbgVariable *, 8> Variables;// Variables declared in scope.
1177 DbgScope(DbgScope *P, DIDescriptor D)
1178 : Parent(P), Desc(D), StartLabelID(0), EndLabelID(0), Scopes(), Variables()
1181 for (unsigned i = 0, N = Scopes.size(); i < N; ++i) delete Scopes[i];
1182 for (unsigned j = 0, M = Variables.size(); j < M; ++j) delete Variables[j];
1186 DbgScope *getParent() const { return Parent; }
1187 DIDescriptor getDesc() const { return Desc; }
1188 unsigned getStartLabelID() const { return StartLabelID; }
1189 unsigned getEndLabelID() const { return EndLabelID; }
1190 SmallVector<DbgScope *, 4> &getScopes() { return Scopes; }
1191 SmallVector<DbgVariable *, 8> &getVariables() { return Variables; }
1192 void setStartLabelID(unsigned S) { StartLabelID = S; }
1193 void setEndLabelID(unsigned E) { EndLabelID = E; }
1195 /// AddScope - Add a scope to the scope.
1197 void AddScope(DbgScope *S) { Scopes.push_back(S); }
1199 /// AddVariable - Add a variable to the scope.
1201 void AddVariable(DbgVariable *V) { Variables.push_back(V); }
1204 //===----------------------------------------------------------------------===//
1205 /// DwarfDebug - Emits Dwarf debug directives.
1207 class DwarfDebug : public Dwarf {
1208 //===--------------------------------------------------------------------===//
1209 // Attributes used to construct specific Dwarf sections.
1212 /// CompileUnitMap - A map of global variables representing compile units to
1214 DenseMap<Value *, CompileUnit *> CompileUnitMap;
1216 /// CompileUnits - All the compile units in this module.
1218 SmallVector<CompileUnit *, 8> CompileUnits;
1220 /// MainCU - Some platform prefers one compile unit per .o file. In such
1221 /// cases, all dies are inserted in MainCU.
1222 CompileUnit *MainCU;
1224 /// AbbreviationsSet - Used to uniquely define abbreviations.
1226 FoldingSet<DIEAbbrev> AbbreviationsSet;
1228 /// Abbreviations - A list of all the unique abbreviations in use.
1230 std::vector<DIEAbbrev *> Abbreviations;
1232 /// DirectoryIdMap - Directory name to directory id map.
1234 StringMap<unsigned> DirectoryIdMap;
1236 /// DirectoryNames - A list of directory names.
1237 SmallVector<std::string, 8> DirectoryNames;
1239 /// SourceFileIdMap - Source file name to source file id map.
1241 StringMap<unsigned> SourceFileIdMap;
1243 /// SourceFileNames - A list of source file names.
1244 SmallVector<std::string, 8> SourceFileNames;
1246 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
1247 /// id mapped to a unique id.
1248 DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
1250 /// SourceIds - Reverse map from source id to directory id + file id pair.
1252 SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
1254 /// Lines - List of of source line correspondence.
1255 std::vector<SrcLineInfo> Lines;
1257 /// ValuesSet - Used to uniquely define values.
1259 FoldingSet<DIEValue> ValuesSet;
1261 /// Values - A list of all the unique values in use.
1263 std::vector<DIEValue *> Values;
1265 /// StringPool - A UniqueVector of strings used by indirect references.
1267 UniqueVector<std::string> StringPool;
1269 /// SectionMap - Provides a unique id per text section.
1271 UniqueVector<const Section*> SectionMap;
1273 /// SectionSourceLines - Tracks line numbers per text section.
1275 std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
1277 /// didInitial - Flag to indicate if initial emission has been done.
1281 /// shouldEmit - Flag to indicate if debug information should be emitted.
1285 // RootDbgScope - Top level scope for the current function.
1287 DbgScope *RootDbgScope;
1289 // DbgScopeMap - Tracks the scopes in the current function.
1290 DenseMap<GlobalVariable *, DbgScope *> DbgScopeMap;
1292 struct FunctionDebugFrameInfo {
1294 std::vector<MachineMove> Moves;
1296 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M):
1297 Number(Num), Moves(M) { }
1300 std::vector<FunctionDebugFrameInfo> DebugFrames;
1304 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
1307 bool ShouldEmitDwarfDebug() const { return shouldEmit; }
1309 /// AssignAbbrevNumber - Define a unique number for the abbreviation.
1311 void AssignAbbrevNumber(DIEAbbrev &Abbrev) {
1312 // Profile the node so that we can make it unique.
1313 FoldingSetNodeID ID;
1316 // Check the set for priors.
1317 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
1319 // If it's newly added.
1320 if (InSet == &Abbrev) {
1321 // Add to abbreviation list.
1322 Abbreviations.push_back(&Abbrev);
1323 // Assign the vector position + 1 as its number.
1324 Abbrev.setNumber(Abbreviations.size());
1326 // Assign existing abbreviation number.
1327 Abbrev.setNumber(InSet->getNumber());
1331 /// NewString - Add a string to the constant pool and returns a label.
1333 DWLabel NewString(const std::string &String) {
1334 unsigned StringID = StringPool.insert(String);
1335 return DWLabel("string", StringID);
1338 /// NewDIEntry - Creates a new DIEntry to be a proxy for a debug information
1340 DIEntry *NewDIEntry(DIE *Entry = NULL) {
1344 FoldingSetNodeID ID;
1345 DIEntry::Profile(ID, Entry);
1347 Value = static_cast<DIEntry *>(ValuesSet.FindNodeOrInsertPos(ID, Where));
1349 if (Value) return Value;
1351 Value = new DIEntry(Entry);
1352 ValuesSet.InsertNode(Value, Where);
1354 Value = new DIEntry(Entry);
1357 Values.push_back(Value);
1361 /// SetDIEntry - Set a DIEntry once the debug information entry is defined.
1363 void SetDIEntry(DIEntry *Value, DIE *Entry) {
1364 Value->Entry = Entry;
1365 // Add to values set if not already there. If it is, we merely have a
1366 // duplicate in the values list (no harm.)
1367 ValuesSet.GetOrInsertNode(Value);
1370 /// AddUInt - Add an unsigned integer attribute data and value.
1372 void AddUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer) {
1373 if (!Form) Form = DIEInteger::BestForm(false, Integer);
1375 FoldingSetNodeID ID;
1376 DIEInteger::Profile(ID, Integer);
1378 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1380 Value = new DIEInteger(Integer);
1381 ValuesSet.InsertNode(Value, Where);
1382 Values.push_back(Value);
1385 Die->AddValue(Attribute, Form, Value);
1388 /// AddSInt - Add an signed integer attribute data and value.
1390 void AddSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer) {
1391 if (!Form) Form = DIEInteger::BestForm(true, Integer);
1393 FoldingSetNodeID ID;
1394 DIEInteger::Profile(ID, (uint64_t)Integer);
1396 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1398 Value = new DIEInteger(Integer);
1399 ValuesSet.InsertNode(Value, Where);
1400 Values.push_back(Value);
1403 Die->AddValue(Attribute, Form, Value);
1406 /// AddString - Add a string attribute data and value.
1408 void AddString(DIE *Die, unsigned Attribute, unsigned Form,
1409 const std::string &String) {
1410 FoldingSetNodeID ID;
1411 DIEString::Profile(ID, String);
1413 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1415 Value = new DIEString(String);
1416 ValuesSet.InsertNode(Value, Where);
1417 Values.push_back(Value);
1420 Die->AddValue(Attribute, Form, Value);
1423 /// AddLabel - Add a Dwarf label attribute data and value.
1425 void AddLabel(DIE *Die, unsigned Attribute, unsigned Form,
1426 const DWLabel &Label) {
1427 FoldingSetNodeID ID;
1428 DIEDwarfLabel::Profile(ID, Label);
1430 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1432 Value = new DIEDwarfLabel(Label);
1433 ValuesSet.InsertNode(Value, Where);
1434 Values.push_back(Value);
1437 Die->AddValue(Attribute, Form, Value);
1440 /// AddObjectLabel - Add an non-Dwarf label attribute data and value.
1442 void AddObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
1443 const std::string &Label) {
1444 FoldingSetNodeID ID;
1445 DIEObjectLabel::Profile(ID, Label);
1447 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1449 Value = new DIEObjectLabel(Label);
1450 ValuesSet.InsertNode(Value, Where);
1451 Values.push_back(Value);
1454 Die->AddValue(Attribute, Form, Value);
1457 /// AddSectionOffset - Add a section offset label attribute data and value.
1459 void AddSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
1460 const DWLabel &Label, const DWLabel &Section,
1461 bool isEH = false, bool useSet = true) {
1462 FoldingSetNodeID ID;
1463 DIESectionOffset::Profile(ID, Label, Section);
1465 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1467 Value = new DIESectionOffset(Label, Section, isEH, useSet);
1468 ValuesSet.InsertNode(Value, Where);
1469 Values.push_back(Value);
1472 Die->AddValue(Attribute, Form, Value);
1475 /// AddDelta - Add a label delta attribute data and value.
1477 void AddDelta(DIE *Die, unsigned Attribute, unsigned Form,
1478 const DWLabel &Hi, const DWLabel &Lo) {
1479 FoldingSetNodeID ID;
1480 DIEDelta::Profile(ID, Hi, Lo);
1482 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1484 Value = new DIEDelta(Hi, Lo);
1485 ValuesSet.InsertNode(Value, Where);
1486 Values.push_back(Value);
1489 Die->AddValue(Attribute, Form, Value);
1492 /// AddDIEntry - Add a DIE attribute data and value.
1494 void AddDIEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
1495 Die->AddValue(Attribute, Form, NewDIEntry(Entry));
1498 /// AddBlock - Add block data.
1500 void AddBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block) {
1501 Block->ComputeSize(*this);
1502 FoldingSetNodeID ID;
1505 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
1508 ValuesSet.InsertNode(Value, Where);
1509 Values.push_back(Value);
1511 // Already exists, reuse the previous one.
1513 Block = cast<DIEBlock>(Value);
1516 Die->AddValue(Attribute, Block->BestForm(), Value);
1521 /// AddSourceLine - Add location information to specified debug information
1523 void AddSourceLine(DIE *Die, const DIVariable *V) {
1524 unsigned FileID = 0;
1525 unsigned Line = V->getLineNumber();
1526 CompileUnit *Unit = FindCompileUnit(V->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 /// AddSourceLine - Add location information to specified debug information
1535 void AddSourceLine(DIE *Die, const DIGlobal *G) {
1536 unsigned FileID = 0;
1537 unsigned Line = G->getLineNumber();
1538 CompileUnit *Unit = FindCompileUnit(G->getCompileUnit());
1539 FileID = Unit->getID();
1540 assert (FileID && "Invalid file id");
1541 AddUInt(Die, DW_AT_decl_file, 0, FileID);
1542 AddUInt(Die, DW_AT_decl_line, 0, Line);
1545 void AddSourceLine(DIE *Die, const DIType *Ty) {
1546 unsigned FileID = 0;
1547 unsigned Line = Ty->getLineNumber();
1548 DICompileUnit CU = Ty->getCompileUnit();
1551 CompileUnit *Unit = FindCompileUnit(CU);
1552 FileID = Unit->getID();
1553 assert (FileID && "Invalid file id");
1554 AddUInt(Die, DW_AT_decl_file, 0, FileID);
1555 AddUInt(Die, DW_AT_decl_line, 0, Line);
1558 /// AddAddress - Add an address attribute to a die based on the location
1560 void AddAddress(DIE *Die, unsigned Attribute,
1561 const MachineLocation &Location) {
1562 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
1563 DIEBlock *Block = new DIEBlock();
1565 if (Location.isReg()) {
1567 AddUInt(Block, 0, DW_FORM_data1, DW_OP_reg0 + Reg);
1569 AddUInt(Block, 0, DW_FORM_data1, DW_OP_regx);
1570 AddUInt(Block, 0, DW_FORM_udata, Reg);
1574 AddUInt(Block, 0, DW_FORM_data1, DW_OP_breg0 + Reg);
1576 AddUInt(Block, 0, DW_FORM_data1, DW_OP_bregx);
1577 AddUInt(Block, 0, DW_FORM_udata, Reg);
1579 AddUInt(Block, 0, DW_FORM_sdata, Location.getOffset());
1582 AddBlock(Die, Attribute, 0, Block);
1585 /// AddType - Add a new type attribute to the specified entity.
1586 void AddType(CompileUnit *DW_Unit, DIE *Entity, DIType Ty) {
1590 // Check for pre-existence.
1591 DIEntry *&Slot = DW_Unit->getDIEntrySlotFor(Ty.getGV());
1592 // If it exists then use the existing value.
1594 Entity->AddValue(DW_AT_type, DW_FORM_ref4, Slot);
1599 Slot = NewDIEntry();
1602 DIE Buffer(DW_TAG_base_type);
1603 if (Ty.isBasicType(Ty.getTag()))
1604 ConstructTypeDIE(DW_Unit, Buffer, DIBasicType(Ty.getGV()));
1605 else if (Ty.isDerivedType(Ty.getTag()))
1606 ConstructTypeDIE(DW_Unit, Buffer, DIDerivedType(Ty.getGV()));
1608 assert(Ty.isCompositeType(Ty.getTag()) && "Unknown kind of DIType");
1609 ConstructTypeDIE(DW_Unit, Buffer, DICompositeType(Ty.getGV()));
1612 // Add debug information entry to entity and appropriate context.
1614 DIDescriptor Context = Ty.getContext();
1615 if (!Context.isNull())
1616 Die = DW_Unit->getDieMapSlotFor(Context.getGV());
1619 DIE *Child = new DIE(Buffer);
1620 Die->AddChild(Child);
1622 SetDIEntry(Slot, Child);
1624 Die = DW_Unit->AddDie(Buffer);
1625 SetDIEntry(Slot, Die);
1628 Entity->AddValue(DW_AT_type, DW_FORM_ref4, Slot);
1631 /// ConstructTypeDIE - Construct basic type die from DIBasicType.
1632 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1635 // Get core information.
1638 Buffer.setTag(DW_TAG_base_type);
1639 AddUInt(&Buffer, DW_AT_encoding, DW_FORM_data1, BTy.getEncoding());
1640 // Add name if not anonymous or intermediate type.
1642 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1643 uint64_t Size = BTy.getSizeInBits() >> 3;
1644 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1647 /// ConstructTypeDIE - Construct derived type die from DIDerivedType.
1648 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1649 DIDerivedType DTy) {
1651 // Get core information.
1654 uint64_t Size = DTy.getSizeInBits() >> 3;
1655 unsigned Tag = DTy.getTag();
1657 // FIXME - Workaround for templates.
1658 if (Tag == DW_TAG_inheritance) Tag = DW_TAG_reference_type;
1662 // Map to main type, void will not have a type.
1663 DIType FromTy = DTy.getTypeDerivedFrom();
1664 AddType(DW_Unit, &Buffer, FromTy);
1666 // Add name if not anonymous or intermediate type.
1668 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1670 // Add size if non-zero (derived types might be zero-sized.)
1672 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1674 // Add source line info if available and TyDesc is not a forward
1676 if (!DTy.isForwardDecl())
1677 AddSourceLine(&Buffer, &DTy);
1680 /// ConstructTypeDIE - Construct type DIE from DICompositeType.
1681 void ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1682 DICompositeType CTy) {
1683 // Get core information.
1687 uint64_t Size = CTy.getSizeInBits() >> 3;
1688 unsigned Tag = CTy.getTag();
1692 case DW_TAG_vector_type:
1693 case DW_TAG_array_type:
1694 ConstructArrayTypeDIE(DW_Unit, Buffer, &CTy);
1696 case DW_TAG_enumeration_type:
1698 DIArray Elements = CTy.getTypeArray();
1699 // Add enumerators to enumeration type.
1700 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1701 DIE *ElemDie = NULL;
1702 DIEnumerator Enum(Elements.getElement(i).getGV());
1703 ElemDie = ConstructEnumTypeDIE(DW_Unit, &Enum);
1704 Buffer.AddChild(ElemDie);
1708 case DW_TAG_subroutine_type:
1710 // Add prototype flag.
1711 AddUInt(&Buffer, DW_AT_prototyped, DW_FORM_flag, 1);
1712 DIArray Elements = CTy.getTypeArray();
1714 DIDescriptor RTy = Elements.getElement(0);
1715 AddType(DW_Unit, &Buffer, DIType(RTy.getGV()));
1718 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
1719 DIE *Arg = new DIE(DW_TAG_formal_parameter);
1720 DIDescriptor Ty = Elements.getElement(i);
1721 AddType(DW_Unit, Arg, DIType(Ty.getGV()));
1722 Buffer.AddChild(Arg);
1726 case DW_TAG_structure_type:
1727 case DW_TAG_union_type:
1729 // Add elements to structure type.
1730 DIArray Elements = CTy.getTypeArray();
1732 // A forward struct declared type may not have elements available.
1733 if (Elements.isNull())
1736 // Add elements to structure type.
1737 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1738 DIDescriptor Element = Elements.getElement(i);
1739 DIE *ElemDie = NULL;
1740 if (Element.getTag() == dwarf::DW_TAG_subprogram)
1741 ElemDie = CreateSubprogramDIE(DW_Unit,
1742 DISubprogram(Element.getGV()));
1743 else if (Element.getTag() == dwarf::DW_TAG_variable) // ???
1744 ElemDie = CreateGlobalVariableDIE(DW_Unit,
1745 DIGlobalVariable(Element.getGV()));
1747 ElemDie = CreateMemberDIE(DW_Unit,
1748 DIDerivedType(Element.getGV()));
1749 Buffer.AddChild(ElemDie);
1751 unsigned RLang = CTy.getRunTimeLang();
1753 AddUInt(&Buffer, DW_AT_APPLE_runtime_class, DW_FORM_data1, RLang);
1760 // Add name if not anonymous or intermediate type.
1762 AddString(&Buffer, DW_AT_name, DW_FORM_string, Name);
1764 if (Tag == DW_TAG_enumeration_type || Tag == DW_TAG_structure_type
1765 || Tag == DW_TAG_union_type) {
1766 // Add size if non-zero (derived types might be zero-sized.)
1768 AddUInt(&Buffer, DW_AT_byte_size, 0, Size);
1770 // Add zero size if it is not a forward declaration.
1771 if (CTy.isForwardDecl())
1772 AddUInt(&Buffer, DW_AT_declaration, DW_FORM_flag, 1);
1774 AddUInt(&Buffer, DW_AT_byte_size, 0, 0);
1777 // Add source line info if available.
1778 if (!CTy.isForwardDecl())
1779 AddSourceLine(&Buffer, &CTy);
1783 /// ConstructSubrangeDIE - Construct subrange DIE from DISubrange.
1784 void ConstructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) {
1785 int64_t L = SR.getLo();
1786 int64_t H = SR.getHi();
1787 DIE *DW_Subrange = new DIE(DW_TAG_subrange_type);
1789 AddDIEntry(DW_Subrange, DW_AT_type, DW_FORM_ref4, IndexTy);
1791 AddSInt(DW_Subrange, DW_AT_lower_bound, 0, L);
1792 AddSInt(DW_Subrange, DW_AT_upper_bound, 0, H);
1794 Buffer.AddChild(DW_Subrange);
1797 /// ConstructArrayTypeDIE - Construct array type DIE from DICompositeType.
1798 void ConstructArrayTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1799 DICompositeType *CTy) {
1800 Buffer.setTag(DW_TAG_array_type);
1801 if (CTy->getTag() == DW_TAG_vector_type)
1802 AddUInt(&Buffer, DW_AT_GNU_vector, DW_FORM_flag, 1);
1804 // Emit derived type.
1805 AddType(DW_Unit, &Buffer, CTy->getTypeDerivedFrom());
1806 DIArray Elements = CTy->getTypeArray();
1808 // Construct an anonymous type for index type.
1809 DIE IdxBuffer(DW_TAG_base_type);
1810 AddUInt(&IdxBuffer, DW_AT_byte_size, 0, sizeof(int32_t));
1811 AddUInt(&IdxBuffer, DW_AT_encoding, DW_FORM_data1, DW_ATE_signed);
1812 DIE *IndexTy = DW_Unit->AddDie(IdxBuffer);
1814 // Add subranges to array type.
1815 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1816 DIDescriptor Element = Elements.getElement(i);
1817 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1818 ConstructSubrangeDIE(Buffer, DISubrange(Element.getGV()), IndexTy);
1822 /// ConstructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
1823 DIE *ConstructEnumTypeDIE(CompileUnit *DW_Unit, DIEnumerator *ETy) {
1825 DIE *Enumerator = new DIE(DW_TAG_enumerator);
1828 AddString(Enumerator, DW_AT_name, DW_FORM_string, Name);
1829 int64_t Value = ETy->getEnumValue();
1830 AddSInt(Enumerator, DW_AT_const_value, DW_FORM_sdata, Value);
1834 /// CreateGlobalVariableDIE - Create new DIE using GV.
1835 DIE *CreateGlobalVariableDIE(CompileUnit *DW_Unit, const DIGlobalVariable &GV)
1837 DIE *GVDie = new DIE(DW_TAG_variable);
1839 GV.getDisplayName(Name);
1840 AddString(GVDie, DW_AT_name, DW_FORM_string, Name);
1841 std::string LinkageName;
1842 GV.getLinkageName(LinkageName);
1843 if (!LinkageName.empty())
1844 AddString(GVDie, DW_AT_MIPS_linkage_name, DW_FORM_string, LinkageName);
1845 AddType(DW_Unit, GVDie, GV.getType());
1846 if (!GV.isLocalToUnit())
1847 AddUInt(GVDie, DW_AT_external, DW_FORM_flag, 1);
1848 AddSourceLine(GVDie, &GV);
1852 /// CreateMemberDIE - Create new member DIE.
1853 DIE *CreateMemberDIE(CompileUnit *DW_Unit, const DIDerivedType &DT) {
1854 DIE *MemberDie = new DIE(DT.getTag());
1858 AddString(MemberDie, DW_AT_name, DW_FORM_string, Name);
1860 AddType(DW_Unit, MemberDie, DT.getTypeDerivedFrom());
1862 AddSourceLine(MemberDie, &DT);
1864 uint64_t Size = DT.getSizeInBits();
1865 uint64_t FieldSize = DT.getOriginalTypeSize();
1867 if (Size != FieldSize) {
1869 AddUInt(MemberDie, DW_AT_byte_size, 0, DT.getOriginalTypeSize() >> 3);
1870 AddUInt(MemberDie, DW_AT_bit_size, 0, DT.getSizeInBits());
1872 uint64_t Offset = DT.getOffsetInBits();
1873 uint64_t FieldOffset = Offset;
1874 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1875 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1876 FieldOffset = (HiMark - FieldSize);
1877 Offset -= FieldOffset;
1878 // Maybe we need to work from the other end.
1879 if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size);
1880 AddUInt(MemberDie, DW_AT_bit_offset, 0, Offset);
1882 DIEBlock *Block = new DIEBlock();
1883 AddUInt(Block, 0, DW_FORM_data1, DW_OP_plus_uconst);
1884 AddUInt(Block, 0, DW_FORM_udata, DT.getOffsetInBits() >> 3);
1885 AddBlock(MemberDie, DW_AT_data_member_location, 0, Block);
1887 if (DT.isProtected())
1888 AddUInt(MemberDie, DW_AT_accessibility, 0, DW_ACCESS_protected);
1889 else if (DT.isPrivate())
1890 AddUInt(MemberDie, DW_AT_accessibility, 0, DW_ACCESS_private);
1895 /// CreateSubprogramDIE - Create new DIE using SP.
1896 DIE *CreateSubprogramDIE(CompileUnit *DW_Unit,
1897 const DISubprogram &SP,
1898 bool IsConstructor = false) {
1899 DIE *SPDie = new DIE(DW_TAG_subprogram);
1902 AddString(SPDie, DW_AT_name, DW_FORM_string, Name);
1903 std::string LinkageName;
1904 SP.getLinkageName(LinkageName);
1905 if (!LinkageName.empty())
1906 AddString(SPDie, DW_AT_MIPS_linkage_name, DW_FORM_string,
1908 AddSourceLine(SPDie, &SP);
1910 DICompositeType SPTy = SP.getType();
1911 DIArray Args = SPTy.getTypeArray();
1914 if (!IsConstructor) {
1916 AddType(DW_Unit, SPDie, SPTy);
1918 AddType(DW_Unit, SPDie, DIType(Args.getElement(0).getGV()));
1921 if (!SP.isDefinition()) {
1922 AddUInt(SPDie, DW_AT_declaration, DW_FORM_flag, 1);
1924 // Do not add arguments for subprogram definition. They will be
1925 // handled through RecordVariable.
1927 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1928 DIE *Arg = new DIE(DW_TAG_formal_parameter);
1929 AddType(DW_Unit, Arg, DIType(Args.getElement(i).getGV()));
1930 AddUInt(Arg, DW_AT_artificial, DW_FORM_flag, 1); // ???
1931 SPDie->AddChild(Arg);
1935 unsigned Lang = SP.getCompileUnit().getLanguage();
1936 if (Lang == DW_LANG_C99 || Lang == DW_LANG_C89
1937 || Lang == DW_LANG_ObjC)
1938 AddUInt(SPDie, DW_AT_prototyped, DW_FORM_flag, 1);
1940 if (!SP.isLocalToUnit())
1941 AddUInt(SPDie, DW_AT_external, DW_FORM_flag, 1);
1945 /// FindCompileUnit - Get the compile unit for the given descriptor.
1947 CompileUnit *FindCompileUnit(DICompileUnit Unit) {
1948 CompileUnit *DW_Unit = CompileUnitMap[Unit.getGV()];
1949 assert(DW_Unit && "Missing compile unit.");
1953 /// NewDbgScopeVariable - Create a new scope variable.
1955 DIE *NewDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit) {
1956 // Get the descriptor.
1957 const DIVariable &VD = DV->getVariable();
1959 // Translate tag to proper Dwarf tag. The result variable is dropped for
1962 switch (VD.getTag()) {
1963 case DW_TAG_return_variable: return NULL;
1964 case DW_TAG_arg_variable: Tag = DW_TAG_formal_parameter; break;
1965 case DW_TAG_auto_variable: // fall thru
1966 default: Tag = DW_TAG_variable; break;
1969 // Define variable debug information entry.
1970 DIE *VariableDie = new DIE(Tag);
1973 AddString(VariableDie, DW_AT_name, DW_FORM_string, Name);
1975 // Add source line info if available.
1976 AddSourceLine(VariableDie, &VD);
1978 // Add variable type.
1979 AddType(Unit, VariableDie, VD.getType());
1981 // Add variable address.
1982 MachineLocation Location;
1983 Location.set(RI->getFrameRegister(*MF),
1984 RI->getFrameIndexOffset(*MF, DV->getFrameIndex()));
1985 AddAddress(VariableDie, DW_AT_location, Location);
1990 /// getOrCreateScope - Returns the scope associated with the given descriptor.
1992 DbgScope *getOrCreateScope(GlobalVariable *V) {
1993 DbgScope *&Slot = DbgScopeMap[V];
1994 if (Slot) return Slot;
1996 // FIXME - breaks down when the context is an inlined function.
1997 DIDescriptor ParentDesc;
1998 DIDescriptor Desc(V);
2000 if (Desc.getTag() == dwarf::DW_TAG_lexical_block) {
2002 ParentDesc = Block.getContext();
2005 DbgScope *Parent = ParentDesc.isNull() ?
2006 NULL : getOrCreateScope(ParentDesc.getGV());
2007 Slot = new DbgScope(Parent, Desc);
2010 Parent->AddScope(Slot);
2011 } else if (RootDbgScope) {
2012 // FIXME - Add inlined function scopes to the root so we can delete them
2013 // later. Long term, handle inlined functions properly.
2014 RootDbgScope->AddScope(Slot);
2016 // First function is top level function.
2017 RootDbgScope = Slot;
2023 /// ConstructDbgScope - Construct the components of a scope.
2025 void ConstructDbgScope(DbgScope *ParentScope,
2026 unsigned ParentStartID, unsigned ParentEndID,
2027 DIE *ParentDie, CompileUnit *Unit) {
2028 // Add variables to scope.
2029 SmallVector<DbgVariable *, 8> &Variables = ParentScope->getVariables();
2030 for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
2031 DIE *VariableDie = NewDbgScopeVariable(Variables[i], Unit);
2032 if (VariableDie) ParentDie->AddChild(VariableDie);
2035 // Add nested scopes.
2036 SmallVector<DbgScope *, 4> &Scopes = ParentScope->getScopes();
2037 for (unsigned j = 0, M = Scopes.size(); j < M; ++j) {
2038 // Define the Scope debug information entry.
2039 DbgScope *Scope = Scopes[j];
2040 // FIXME - Ignore inlined functions for the time being.
2041 if (!Scope->getParent()) continue;
2043 unsigned StartID = MMI->MappedLabel(Scope->getStartLabelID());
2044 unsigned EndID = MMI->MappedLabel(Scope->getEndLabelID());
2046 // Ignore empty scopes.
2047 if (StartID == EndID && StartID != 0) continue;
2048 if (Scope->getScopes().empty() && Scope->getVariables().empty()) continue;
2050 if (StartID == ParentStartID && EndID == ParentEndID) {
2051 // Just add stuff to the parent scope.
2052 ConstructDbgScope(Scope, ParentStartID, ParentEndID, ParentDie, Unit);
2054 DIE *ScopeDie = new DIE(DW_TAG_lexical_block);
2056 // Add the scope bounds.
2058 AddLabel(ScopeDie, DW_AT_low_pc, DW_FORM_addr,
2059 DWLabel("label", StartID));
2061 AddLabel(ScopeDie, DW_AT_low_pc, DW_FORM_addr,
2062 DWLabel("func_begin", SubprogramCount));
2065 AddLabel(ScopeDie, DW_AT_high_pc, DW_FORM_addr,
2066 DWLabel("label", EndID));
2068 AddLabel(ScopeDie, DW_AT_high_pc, DW_FORM_addr,
2069 DWLabel("func_end", SubprogramCount));
2072 // Add the scope contents.
2073 ConstructDbgScope(Scope, StartID, EndID, ScopeDie, Unit);
2074 ParentDie->AddChild(ScopeDie);
2079 /// ConstructRootDbgScope - Construct the scope for the subprogram.
2081 void ConstructRootDbgScope(DbgScope *RootScope) {
2082 // Exit if there is no root scope.
2083 if (!RootScope) return;
2084 DIDescriptor Desc = RootScope->getDesc();
2088 // Get the subprogram debug information entry.
2089 DISubprogram SPD(Desc.getGV());
2091 // Get the compile unit context.
2092 CompileUnit *Unit = MainCU;
2094 Unit = FindCompileUnit(SPD.getCompileUnit());
2096 // Get the subprogram die.
2097 DIE *SPDie = Unit->getDieMapSlotFor(SPD.getGV());
2098 assert(SPDie && "Missing subprogram descriptor");
2100 // Add the function bounds.
2101 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2102 DWLabel("func_begin", SubprogramCount));
2103 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2104 DWLabel("func_end", SubprogramCount));
2105 MachineLocation Location(RI->getFrameRegister(*MF));
2106 AddAddress(SPDie, DW_AT_frame_base, Location);
2108 ConstructDbgScope(RootScope, 0, 0, SPDie, Unit);
2111 /// ConstructDefaultDbgScope - Construct a default scope for the subprogram.
2113 void ConstructDefaultDbgScope(MachineFunction *MF) {
2114 const char *FnName = MF->getFunction()->getNameStart();
2116 std::map<std::string, DIE*> &Globals = MainCU->getGlobals();
2117 std::map<std::string, DIE*>::iterator GI = Globals.find(FnName);
2118 if (GI != Globals.end()) {
2119 DIE *SPDie = GI->second;
2121 // Add the function bounds.
2122 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2123 DWLabel("func_begin", SubprogramCount));
2124 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2125 DWLabel("func_end", SubprogramCount));
2127 MachineLocation Location(RI->getFrameRegister(*MF));
2128 AddAddress(SPDie, DW_AT_frame_base, Location);
2132 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i) {
2133 CompileUnit *Unit = CompileUnits[i];
2134 std::map<std::string, DIE*> &Globals = Unit->getGlobals();
2135 std::map<std::string, DIE*>::iterator GI = Globals.find(FnName);
2136 if (GI != Globals.end()) {
2137 DIE *SPDie = GI->second;
2139 // Add the function bounds.
2140 AddLabel(SPDie, DW_AT_low_pc, DW_FORM_addr,
2141 DWLabel("func_begin", SubprogramCount));
2142 AddLabel(SPDie, DW_AT_high_pc, DW_FORM_addr,
2143 DWLabel("func_end", SubprogramCount));
2145 MachineLocation Location(RI->getFrameRegister(*MF));
2146 AddAddress(SPDie, DW_AT_frame_base, Location);
2153 // FIXME: This is causing an abort because C++ mangled names are compared
2154 // with their unmangled counterparts. See PR2885. Don't do this assert.
2155 assert(0 && "Couldn't find DIE for machine function!");
2160 /// EmitInitial - Emit initial Dwarf declarations. This is necessary for cc
2161 /// tools to recognize the object file contains Dwarf information.
2162 void EmitInitial() {
2163 // Check to see if we already emitted intial headers.
2164 if (didInitial) return;
2167 // Dwarf sections base addresses.
2168 if (TAI->doesDwarfRequireFrameSection()) {
2169 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2170 EmitLabel("section_debug_frame", 0);
2172 Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
2173 EmitLabel("section_info", 0);
2174 Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
2175 EmitLabel("section_abbrev", 0);
2176 Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
2177 EmitLabel("section_aranges", 0);
2178 if (TAI->doesSupportMacInfoSection()) {
2179 Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
2180 EmitLabel("section_macinfo", 0);
2182 Asm->SwitchToDataSection(TAI->getDwarfLineSection());
2183 EmitLabel("section_line", 0);
2184 Asm->SwitchToDataSection(TAI->getDwarfLocSection());
2185 EmitLabel("section_loc", 0);
2186 Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
2187 EmitLabel("section_pubnames", 0);
2188 Asm->SwitchToDataSection(TAI->getDwarfStrSection());
2189 EmitLabel("section_str", 0);
2190 Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
2191 EmitLabel("section_ranges", 0);
2193 Asm->SwitchToSection(TAI->getTextSection());
2194 EmitLabel("text_begin", 0);
2195 Asm->SwitchToSection(TAI->getDataSection());
2196 EmitLabel("data_begin", 0);
2199 /// EmitDIE - Recusively Emits a debug information entry.
2201 void EmitDIE(DIE *Die) {
2202 // Get the abbreviation for this DIE.
2203 unsigned AbbrevNumber = Die->getAbbrevNumber();
2204 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2208 // Emit the code (index) for the abbreviation.
2209 Asm->EmitULEB128Bytes(AbbrevNumber);
2212 Asm->EOL(std::string("Abbrev [" +
2213 utostr(AbbrevNumber) +
2214 "] 0x" + utohexstr(Die->getOffset()) +
2215 ":0x" + utohexstr(Die->getSize()) + " " +
2216 TagString(Abbrev->getTag())));
2220 SmallVector<DIEValue*, 32> &Values = Die->getValues();
2221 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2223 // Emit the DIE attribute values.
2224 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2225 unsigned Attr = AbbrevData[i].getAttribute();
2226 unsigned Form = AbbrevData[i].getForm();
2227 assert(Form && "Too many attributes for DIE (check abbreviation)");
2230 case DW_AT_sibling: {
2231 Asm->EmitInt32(Die->SiblingOffset());
2235 // Emit an attribute using the defined form.
2236 Values[i]->EmitValue(*this, Form);
2241 Asm->EOL(AttributeString(Attr));
2244 // Emit the DIE children if any.
2245 if (Abbrev->getChildrenFlag() == DW_CHILDREN_yes) {
2246 const std::vector<DIE *> &Children = Die->getChildren();
2248 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
2249 EmitDIE(Children[j]);
2252 Asm->EmitInt8(0); Asm->EOL("End Of Children Mark");
2256 /// SizeAndOffsetDie - Compute the size and offset of a DIE.
2258 unsigned SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last) {
2259 // Get the children.
2260 const std::vector<DIE *> &Children = Die->getChildren();
2262 // If not last sibling and has children then add sibling offset attribute.
2263 if (!Last && !Children.empty()) Die->AddSiblingOffset();
2265 // Record the abbreviation.
2266 AssignAbbrevNumber(Die->getAbbrev());
2268 // Get the abbreviation for this DIE.
2269 unsigned AbbrevNumber = Die->getAbbrevNumber();
2270 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2273 Die->setOffset(Offset);
2275 // Start the size with the size of abbreviation code.
2276 Offset += TargetAsmInfo::getULEB128Size(AbbrevNumber);
2278 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2279 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2281 // Size the DIE attribute values.
2282 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2283 // Size attribute value.
2284 Offset += Values[i]->SizeOf(*this, AbbrevData[i].getForm());
2287 // Size the DIE children if any.
2288 if (!Children.empty()) {
2289 assert(Abbrev->getChildrenFlag() == DW_CHILDREN_yes &&
2290 "Children flag not set");
2292 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
2293 Offset = SizeAndOffsetDie(Children[j], Offset, (j + 1) == M);
2296 // End of children marker.
2297 Offset += sizeof(int8_t);
2300 Die->setSize(Offset - Die->getOffset());
2304 /// SizeAndOffsets - Compute the size and offset of all the DIEs.
2306 void SizeAndOffsets() {
2307 // Process base compile unit.
2309 // Compute size of compile unit header
2310 unsigned Offset = sizeof(int32_t) + // Length of Compilation Unit Info
2311 sizeof(int16_t) + // DWARF version number
2312 sizeof(int32_t) + // Offset Into Abbrev. Section
2313 sizeof(int8_t); // Pointer Size (in bytes)
2314 SizeAndOffsetDie(MainCU->getDie(), Offset, true);
2317 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i) {
2318 CompileUnit *Unit = CompileUnits[i];
2319 // Compute size of compile unit header
2320 unsigned Offset = sizeof(int32_t) + // Length of Compilation Unit Info
2321 sizeof(int16_t) + // DWARF version number
2322 sizeof(int32_t) + // Offset Into Abbrev. Section
2323 sizeof(int8_t); // Pointer Size (in bytes)
2324 SizeAndOffsetDie(Unit->getDie(), Offset, true);
2328 /// EmitDebugInfo / EmitDebugInfoPerCU - Emit the debug info section.
2330 void EmitDebugInfoPerCU(CompileUnit *Unit) {
2331 DIE *Die = Unit->getDie();
2332 // Emit the compile units header.
2333 EmitLabel("info_begin", Unit->getID());
2334 // Emit size of content not including length itself
2335 unsigned ContentSize = Die->getSize() +
2336 sizeof(int16_t) + // DWARF version number
2337 sizeof(int32_t) + // Offset Into Abbrev. Section
2338 sizeof(int8_t) + // Pointer Size (in bytes)
2339 sizeof(int32_t); // FIXME - extra pad for gdb bug.
2341 Asm->EmitInt32(ContentSize); Asm->EOL("Length of Compilation Unit Info");
2342 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
2343 EmitSectionOffset("abbrev_begin", "section_abbrev", 0, 0, true, false);
2344 Asm->EOL("Offset Into Abbrev. Section");
2345 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
2348 // FIXME - extra padding for gdb bug.
2349 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2350 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2351 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2352 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2353 EmitLabel("info_end", Unit->getID());
2358 void EmitDebugInfo() {
2359 // Start debug info section.
2360 Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
2363 EmitDebugInfoPerCU(MainCU);
2367 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i)
2368 EmitDebugInfoPerCU(CompileUnits[i]);
2371 /// EmitAbbreviations - Emit the abbreviation section.
2373 void EmitAbbreviations() const {
2374 // Check to see if it is worth the effort.
2375 if (!Abbreviations.empty()) {
2376 // Start the debug abbrev section.
2377 Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
2379 EmitLabel("abbrev_begin", 0);
2381 // For each abbrevation.
2382 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2383 // Get abbreviation data
2384 const DIEAbbrev *Abbrev = Abbreviations[i];
2386 // Emit the abbrevations code (base 1 index.)
2387 Asm->EmitULEB128Bytes(Abbrev->getNumber());
2388 Asm->EOL("Abbreviation Code");
2390 // Emit the abbreviations data.
2391 Abbrev->Emit(*this);
2396 // Mark end of abbreviations.
2397 Asm->EmitULEB128Bytes(0); Asm->EOL("EOM(3)");
2399 EmitLabel("abbrev_end", 0);
2405 /// EmitEndOfLineMatrix - Emit the last address of the section and the end of
2406 /// the line matrix.
2408 void EmitEndOfLineMatrix(unsigned SectionEnd) {
2409 // Define last address of section.
2410 Asm->EmitInt8(0); Asm->EOL("Extended Op");
2411 Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
2412 Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
2413 EmitReference("section_end", SectionEnd); Asm->EOL("Section end label");
2415 // Mark end of matrix.
2416 Asm->EmitInt8(0); Asm->EOL("DW_LNE_end_sequence");
2417 Asm->EmitULEB128Bytes(1); Asm->EOL();
2418 Asm->EmitInt8(1); Asm->EOL();
2421 /// EmitDebugLines - Emit source line information.
2423 void EmitDebugLines() {
2424 // If the target is using .loc/.file, the assembler will be emitting the
2425 // .debug_line table automatically.
2426 if (TAI->hasDotLocAndDotFile())
2429 // Minimum line delta, thus ranging from -10..(255-10).
2430 const int MinLineDelta = -(DW_LNS_fixed_advance_pc + 1);
2431 // Maximum line delta, thus ranging from -10..(255-10).
2432 const int MaxLineDelta = 255 + MinLineDelta;
2434 // Start the dwarf line section.
2435 Asm->SwitchToDataSection(TAI->getDwarfLineSection());
2437 // Construct the section header.
2439 EmitDifference("line_end", 0, "line_begin", 0, true);
2440 Asm->EOL("Length of Source Line Info");
2441 EmitLabel("line_begin", 0);
2443 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
2445 EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0, true);
2446 Asm->EOL("Prolog Length");
2447 EmitLabel("line_prolog_begin", 0);
2449 Asm->EmitInt8(1); Asm->EOL("Minimum Instruction Length");
2451 Asm->EmitInt8(1); Asm->EOL("Default is_stmt_start flag");
2453 Asm->EmitInt8(MinLineDelta); Asm->EOL("Line Base Value (Special Opcodes)");
2455 Asm->EmitInt8(MaxLineDelta); Asm->EOL("Line Range Value (Special Opcodes)");
2457 Asm->EmitInt8(-MinLineDelta); Asm->EOL("Special Opcode Base");
2459 // Line number standard opcode encodings argument count
2460 Asm->EmitInt8(0); Asm->EOL("DW_LNS_copy arg count");
2461 Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_pc arg count");
2462 Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_line arg count");
2463 Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_file arg count");
2464 Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_column arg count");
2465 Asm->EmitInt8(0); Asm->EOL("DW_LNS_negate_stmt arg count");
2466 Asm->EmitInt8(0); Asm->EOL("DW_LNS_set_basic_block arg count");
2467 Asm->EmitInt8(0); Asm->EOL("DW_LNS_const_add_pc arg count");
2468 Asm->EmitInt8(1); Asm->EOL("DW_LNS_fixed_advance_pc arg count");
2470 // Emit directories.
2471 for (unsigned DI = 1, DE = getNumSourceDirectories()+1; DI != DE; ++DI) {
2472 Asm->EmitString(getSourceDirectoryName(DI));
2473 Asm->EOL("Directory");
2475 Asm->EmitInt8(0); Asm->EOL("End of directories");
2478 for (unsigned SI = 1, SE = getNumSourceIds()+1; SI != SE; ++SI) {
2479 // Remember source id starts at 1.
2480 std::pair<unsigned, unsigned> Id = getSourceDirsectoryAndFileIds(SI);
2481 Asm->EmitString(getSourceFileName(Id.second));
2483 Asm->EmitULEB128Bytes(Id.first);
2484 Asm->EOL("Directory #");
2485 Asm->EmitULEB128Bytes(0);
2486 Asm->EOL("Mod date");
2487 Asm->EmitULEB128Bytes(0);
2488 Asm->EOL("File size");
2490 Asm->EmitInt8(0); Asm->EOL("End of files");
2492 EmitLabel("line_prolog_end", 0);
2494 // A sequence for each text section.
2495 unsigned SecSrcLinesSize = SectionSourceLines.size();
2497 for (unsigned j = 0; j < SecSrcLinesSize; ++j) {
2498 // Isolate current sections line info.
2499 const std::vector<SrcLineInfo> &LineInfos = SectionSourceLines[j];
2502 const Section* S = SectionMap[j + 1];
2503 O << '\t' << TAI->getCommentString() << " Section"
2504 << S->getName() << '\n';
2508 // Dwarf assumes we start with first line of first source file.
2509 unsigned Source = 1;
2512 // Construct rows of the address, source, line, column matrix.
2513 for (unsigned i = 0, N = LineInfos.size(); i < N; ++i) {
2514 const SrcLineInfo &LineInfo = LineInfos[i];
2515 unsigned LabelID = MMI->MappedLabel(LineInfo.getLabelID());
2516 if (!LabelID) continue;
2521 std::pair<unsigned, unsigned> SourceID =
2522 getSourceDirsectoryAndFileIds(LineInfo.getSourceID());
2523 O << '\t' << TAI->getCommentString() << ' '
2524 << getSourceDirectoryName(SourceID.first) << ' '
2525 << getSourceFileName(SourceID.second)
2526 <<" :" << utostr_32(LineInfo.getLine()) << '\n';
2529 // Define the line address.
2530 Asm->EmitInt8(0); Asm->EOL("Extended Op");
2531 Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
2532 Asm->EmitInt8(DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
2533 EmitReference("label", LabelID); Asm->EOL("Location label");
2535 // If change of source, then switch to the new source.
2536 if (Source != LineInfo.getSourceID()) {
2537 Source = LineInfo.getSourceID();
2538 Asm->EmitInt8(DW_LNS_set_file); Asm->EOL("DW_LNS_set_file");
2539 Asm->EmitULEB128Bytes(Source); Asm->EOL("New Source");
2542 // If change of line.
2543 if (Line != LineInfo.getLine()) {
2544 // Determine offset.
2545 int Offset = LineInfo.getLine() - Line;
2546 int Delta = Offset - MinLineDelta;
2549 Line = LineInfo.getLine();
2551 // If delta is small enough and in range...
2552 if (Delta >= 0 && Delta < (MaxLineDelta - 1)) {
2553 // ... then use fast opcode.
2554 Asm->EmitInt8(Delta - MinLineDelta); Asm->EOL("Line Delta");
2556 // ... otherwise use long hand.
2557 Asm->EmitInt8(DW_LNS_advance_line); Asm->EOL("DW_LNS_advance_line");
2558 Asm->EmitSLEB128Bytes(Offset); Asm->EOL("Line Offset");
2559 Asm->EmitInt8(DW_LNS_copy); Asm->EOL("DW_LNS_copy");
2562 // Copy the previous row (different address or source)
2563 Asm->EmitInt8(DW_LNS_copy); Asm->EOL("DW_LNS_copy");
2567 EmitEndOfLineMatrix(j + 1);
2570 if (SecSrcLinesSize == 0)
2571 // Because we're emitting a debug_line section, we still need a line
2572 // table. The linker and friends expect it to exist. If there's nothing to
2573 // put into it, emit an empty table.
2574 EmitEndOfLineMatrix(1);
2576 EmitLabel("line_end", 0);
2581 /// EmitCommonDebugFrame - Emit common frame info into a debug frame section.
2583 void EmitCommonDebugFrame() {
2584 if (!TAI->doesDwarfRequireFrameSection())
2588 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
2589 TargetFrameInfo::StackGrowsUp ?
2590 TD->getPointerSize() : -TD->getPointerSize();
2592 // Start the dwarf frame section.
2593 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2595 EmitLabel("debug_frame_common", 0);
2596 EmitDifference("debug_frame_common_end", 0,
2597 "debug_frame_common_begin", 0, true);
2598 Asm->EOL("Length of Common Information Entry");
2600 EmitLabel("debug_frame_common_begin", 0);
2601 Asm->EmitInt32((int)DW_CIE_ID);
2602 Asm->EOL("CIE Identifier Tag");
2603 Asm->EmitInt8(DW_CIE_VERSION);
2604 Asm->EOL("CIE Version");
2605 Asm->EmitString("");
2606 Asm->EOL("CIE Augmentation");
2607 Asm->EmitULEB128Bytes(1);
2608 Asm->EOL("CIE Code Alignment Factor");
2609 Asm->EmitSLEB128Bytes(stackGrowth);
2610 Asm->EOL("CIE Data Alignment Factor");
2611 Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), false));
2612 Asm->EOL("CIE RA Column");
2614 std::vector<MachineMove> Moves;
2615 RI->getInitialFrameState(Moves);
2617 EmitFrameMoves(NULL, 0, Moves, false);
2619 Asm->EmitAlignment(2, 0, 0, false);
2620 EmitLabel("debug_frame_common_end", 0);
2625 /// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
2627 void EmitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo) {
2628 if (!TAI->doesDwarfRequireFrameSection())
2631 // Start the dwarf frame section.
2632 Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
2634 EmitDifference("debug_frame_end", DebugFrameInfo.Number,
2635 "debug_frame_begin", DebugFrameInfo.Number, true);
2636 Asm->EOL("Length of Frame Information Entry");
2638 EmitLabel("debug_frame_begin", DebugFrameInfo.Number);
2640 EmitSectionOffset("debug_frame_common", "section_debug_frame",
2642 Asm->EOL("FDE CIE offset");
2644 EmitReference("func_begin", DebugFrameInfo.Number);
2645 Asm->EOL("FDE initial location");
2646 EmitDifference("func_end", DebugFrameInfo.Number,
2647 "func_begin", DebugFrameInfo.Number);
2648 Asm->EOL("FDE address range");
2650 EmitFrameMoves("func_begin", DebugFrameInfo.Number, DebugFrameInfo.Moves,
2653 Asm->EmitAlignment(2, 0, 0, false);
2654 EmitLabel("debug_frame_end", DebugFrameInfo.Number);
2659 void EmitDebugPubNamesPerCU(CompileUnit *Unit) {
2660 EmitDifference("pubnames_end", Unit->getID(),
2661 "pubnames_begin", Unit->getID(), true);
2662 Asm->EOL("Length of Public Names Info");
2664 EmitLabel("pubnames_begin", Unit->getID());
2666 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF Version");
2668 EmitSectionOffset("info_begin", "section_info",
2669 Unit->getID(), 0, true, false);
2670 Asm->EOL("Offset of Compilation Unit Info");
2672 EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID(),
2674 Asm->EOL("Compilation Unit Length");
2676 std::map<std::string, DIE *> &Globals = Unit->getGlobals();
2677 for (std::map<std::string, DIE *>::iterator GI = Globals.begin(),
2678 GE = Globals.end(); GI != GE; ++GI) {
2679 const std::string &Name = GI->first;
2680 DIE * Entity = GI->second;
2682 Asm->EmitInt32(Entity->getOffset()); Asm->EOL("DIE offset");
2683 Asm->EmitString(Name); Asm->EOL("External Name");
2686 Asm->EmitInt32(0); Asm->EOL("End Mark");
2687 EmitLabel("pubnames_end", Unit->getID());
2692 /// EmitDebugPubNames - Emit visible names into a debug pubnames section.
2694 void EmitDebugPubNames() {
2695 // Start the dwarf pubnames section.
2696 Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
2699 EmitDebugPubNamesPerCU(MainCU);
2703 for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i)
2704 EmitDebugPubNamesPerCU(CompileUnits[i]);
2707 /// EmitDebugStr - Emit visible names into a debug str section.
2709 void EmitDebugStr() {
2710 // Check to see if it is worth the effort.
2711 if (!StringPool.empty()) {
2712 // Start the dwarf str section.
2713 Asm->SwitchToDataSection(TAI->getDwarfStrSection());
2715 // For each of strings in the string pool.
2716 for (unsigned StringID = 1, N = StringPool.size();
2717 StringID <= N; ++StringID) {
2718 // Emit a label for reference from debug information entries.
2719 EmitLabel("string", StringID);
2720 // Emit the string itself.
2721 const std::string &String = StringPool[StringID];
2722 Asm->EmitString(String); Asm->EOL();
2729 /// EmitDebugLoc - Emit visible names into a debug loc section.
2731 void EmitDebugLoc() {
2732 // Start the dwarf loc section.
2733 Asm->SwitchToDataSection(TAI->getDwarfLocSection());
2738 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2740 void EmitDebugARanges() {
2741 // Start the dwarf aranges section.
2742 Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
2746 CompileUnit *Unit = GetBaseCompileUnit();
2748 // Don't include size of length
2749 Asm->EmitInt32(0x1c); Asm->EOL("Length of Address Ranges Info");
2751 Asm->EmitInt16(DWARF_VERSION); Asm->EOL("Dwarf Version");
2753 EmitReference("info_begin", Unit->getID());
2754 Asm->EOL("Offset of Compilation Unit Info");
2756 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Size of Address");
2758 Asm->EmitInt8(0); Asm->EOL("Size of Segment Descriptor");
2760 Asm->EmitInt16(0); Asm->EOL("Pad (1)");
2761 Asm->EmitInt16(0); Asm->EOL("Pad (2)");
2764 EmitReference("text_begin", 0); Asm->EOL("Address");
2765 EmitDifference("text_end", 0, "text_begin", 0, true); Asm->EOL("Length");
2767 Asm->EmitInt32(0); Asm->EOL("EOM (1)");
2768 Asm->EmitInt32(0); Asm->EOL("EOM (2)");
2774 /// EmitDebugRanges - Emit visible names into a debug ranges section.
2776 void EmitDebugRanges() {
2777 // Start the dwarf ranges section.
2778 Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
2783 /// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
2785 void EmitDebugMacInfo() {
2786 if (TAI->doesSupportMacInfoSection()) {
2787 // Start the dwarf macinfo section.
2788 Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
2794 void ConstructCompileUnit(GlobalVariable *GV) {
2795 DICompileUnit DIUnit(GV);
2796 std::string Dir, FN, Prod;
2797 unsigned ID = getOrCreateSourceID(DIUnit.getDirectory(Dir),
2798 DIUnit.getFilename(FN));
2800 DIE *Die = new DIE(DW_TAG_compile_unit);
2801 AddSectionOffset(Die, DW_AT_stmt_list, DW_FORM_data4,
2802 DWLabel("section_line", 0), DWLabel("section_line", 0),
2804 AddString(Die, DW_AT_producer, DW_FORM_string, DIUnit.getProducer(Prod));
2805 AddUInt(Die, DW_AT_language, DW_FORM_data1, DIUnit.getLanguage());
2806 AddString(Die, DW_AT_name, DW_FORM_string, FN);
2808 AddString(Die, DW_AT_comp_dir, DW_FORM_string, Dir);
2809 if (DIUnit.isOptimized())
2810 AddUInt(Die, DW_AT_APPLE_optimized, DW_FORM_flag, 1);
2812 DIUnit.getFlags(Flags);
2814 AddString(Die, DW_AT_APPLE_flags, DW_FORM_string, Flags);
2815 unsigned RVer = DIUnit.getRunTimeVersion();
2817 AddUInt(Die, DW_AT_APPLE_major_runtime_vers, DW_FORM_data1, RVer);
2819 CompileUnit *Unit = new CompileUnit(ID, Die);
2820 if (DIUnit.isMain()) {
2821 assert(!MainCU && "Multiple main compile units are found!");
2824 CompileUnitMap[DIUnit.getGV()] = Unit;
2825 CompileUnits.push_back(Unit);
2828 /// ConstructCompileUnits - Create a compile unit DIEs.
2829 void ConstructCompileUnits() {
2830 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.compile_units");
2833 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
2834 "Malformed compile unit descriptor anchor type");
2835 Constant *RootC = cast<Constant>(*Root->use_begin());
2836 assert(RootC->hasNUsesOrMore(1) &&
2837 "Malformed compile unit descriptor anchor type");
2838 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
2840 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
2841 UUI != UUE; ++UUI) {
2842 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
2843 ConstructCompileUnit(GV);
2847 bool ConstructGlobalVariableDIE(GlobalVariable *GV) {
2848 DIGlobalVariable DI_GV(GV);
2849 CompileUnit *DW_Unit = MainCU;
2851 DW_Unit = FindCompileUnit(DI_GV.getCompileUnit());
2853 // Check for pre-existence.
2854 DIE *&Slot = DW_Unit->getDieMapSlotFor(DI_GV.getGV());
2858 DIE *VariableDie = CreateGlobalVariableDIE(DW_Unit, DI_GV);
2861 DIEBlock *Block = new DIEBlock();
2862 AddUInt(Block, 0, DW_FORM_data1, DW_OP_addr);
2863 AddObjectLabel(Block, 0, DW_FORM_udata,
2864 Asm->getGlobalLinkName(DI_GV.getGlobal()));
2865 AddBlock(VariableDie, DW_AT_location, 0, Block);
2869 // Add to context owner.
2870 DW_Unit->getDie()->AddChild(VariableDie);
2871 // Expose as global. FIXME - need to check external flag.
2873 DW_Unit->AddGlobal(DI_GV.getName(Name), VariableDie);
2877 /// ConstructGlobalVariableDIEs - Create DIEs for each of the externally
2878 /// visible global variables. Return true if at least one global DIE is
2880 bool ConstructGlobalVariableDIEs() {
2881 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.global_variables");
2885 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
2886 "Malformed global variable descriptor anchor type");
2887 Constant *RootC = cast<Constant>(*Root->use_begin());
2888 assert(RootC->hasNUsesOrMore(1) &&
2889 "Malformed global variable descriptor anchor type");
2891 bool Result = false;
2892 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
2894 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
2895 UUI != UUE; ++UUI) {
2896 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
2897 Result |= ConstructGlobalVariableDIE(GV);
2902 bool ConstructSubprogram(GlobalVariable *GV) {
2903 DISubprogram SP(GV);
2904 CompileUnit *Unit = MainCU;
2906 Unit = FindCompileUnit(SP.getCompileUnit());
2908 // Check for pre-existence.
2909 DIE *&Slot = Unit->getDieMapSlotFor(GV);
2913 if (!SP.isDefinition())
2914 // This is a method declaration which will be handled while
2915 // constructing class type.
2918 DIE *SubprogramDie = CreateSubprogramDIE(Unit, SP);
2921 Slot = SubprogramDie;
2922 // Add to context owner.
2923 Unit->getDie()->AddChild(SubprogramDie);
2924 // Expose as global.
2926 Unit->AddGlobal(SP.getName(Name), SubprogramDie);
2930 /// ConstructSubprograms - Create DIEs for each of the externally visible
2931 /// subprograms. Return true if at least one subprogram DIE is created.
2932 bool ConstructSubprograms() {
2933 GlobalVariable *Root = M->getGlobalVariable("llvm.dbg.subprograms");
2937 assert(Root->hasLinkOnceLinkage() && Root->hasOneUse() &&
2938 "Malformed subprogram descriptor anchor type");
2939 Constant *RootC = cast<Constant>(*Root->use_begin());
2940 assert(RootC->hasNUsesOrMore(1) &&
2941 "Malformed subprogram descriptor anchor type");
2943 bool Result = false;
2944 for (Value::use_iterator UI = RootC->use_begin(), UE = Root->use_end();
2946 for (Value::use_iterator UUI = UI->use_begin(), UUE = UI->use_end();
2947 UUI != UUE; ++UUI) {
2948 GlobalVariable *GV = cast<GlobalVariable>(*UUI);
2949 Result |= ConstructSubprogram(GV);
2955 //===--------------------------------------------------------------------===//
2956 // Main entry points.
2958 DwarfDebug(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
2959 : Dwarf(OS, A, T, "dbg")
2961 , AbbreviationsSet(InitAbbreviationsSetSize)
2963 , ValuesSet(InitValuesSetSize)
2967 , SectionSourceLines()
2970 , RootDbgScope(NULL)
2973 virtual ~DwarfDebug() {
2974 for (unsigned j = 0, M = Values.size(); j < M; ++j)
2978 /// SetDebugInfo - Create global DIEs and emit initial debug info sections.
2979 /// This is inovked by the target AsmPrinter.
2980 void SetDebugInfo(MachineModuleInfo *mmi) {
2981 // Create all the compile unit DIEs.
2982 ConstructCompileUnits();
2984 if (CompileUnits.empty())
2987 // Create DIEs for each of the externally visible global variables.
2988 bool globalDIEs = ConstructGlobalVariableDIEs();
2990 // Create DIEs for each of the externally visible subprograms.
2991 bool subprogramDIEs = ConstructSubprograms();
2993 // If there is not any debug info available for any global variables
2994 // and any subprograms then there is not any debug info to emit.
2995 if (!globalDIEs && !subprogramDIEs)
3000 MMI->setDebugInfoAvailability(true);
3002 // Prime section data.
3003 SectionMap.insert(TAI->getTextSection());
3005 // Print out .file directives to specify files for .loc directives. These
3006 // are printed out early so that they precede any .loc directives.
3007 if (TAI->hasDotLocAndDotFile()) {
3008 for (unsigned i = 1, e = getNumSourceIds()+1; i != e; ++i) {
3009 // Remember source id starts at 1.
3010 std::pair<unsigned, unsigned> Id = getSourceDirsectoryAndFileIds(i);
3011 sys::Path FullPath(getSourceDirectoryName(Id.first));
3013 FullPath.appendComponent(getSourceFileName(Id.second));
3014 assert(AppendOk && "Could not append filename to directory!");
3016 Asm->EmitFile(i, FullPath.toString());
3021 // Emit initial sections
3025 /// BeginModule - Emit all Dwarf sections that should come prior to the
3027 void BeginModule(Module *M) {
3031 /// EndModule - Emit all Dwarf sections that should come after the content.
3034 if (!ShouldEmitDwarfDebug()) return;
3036 // Standard sections final addresses.
3037 Asm->SwitchToSection(TAI->getTextSection());
3038 EmitLabel("text_end", 0);
3039 Asm->SwitchToSection(TAI->getDataSection());
3040 EmitLabel("data_end", 0);
3042 // End text sections.
3043 for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
3044 Asm->SwitchToSection(SectionMap[i]);
3045 EmitLabel("section_end", i);
3048 // Emit common frame information.
3049 EmitCommonDebugFrame();
3051 // Emit function debug frame information
3052 for (std::vector<FunctionDebugFrameInfo>::iterator I = DebugFrames.begin(),
3053 E = DebugFrames.end(); I != E; ++I)
3054 EmitFunctionDebugFrame(*I);
3056 // Compute DIE offsets and sizes.
3059 // Emit all the DIEs into a debug info section
3062 // Corresponding abbreviations into a abbrev section.
3063 EmitAbbreviations();
3065 // Emit source line correspondence into a debug line section.
3068 // Emit info into a debug pubnames section.
3069 EmitDebugPubNames();
3071 // Emit info into a debug str section.
3074 // Emit info into a debug loc section.
3077 // Emit info into a debug aranges section.
3080 // Emit info into a debug ranges section.
3083 // Emit info into a debug macinfo section.
3087 /// BeginFunction - Gather pre-function debug information. Assumes being
3088 /// emitted immediately after the function entry point.
3089 void BeginFunction(MachineFunction *MF) {
3092 if (!ShouldEmitDwarfDebug()) return;
3094 // Begin accumulating function debug information.
3095 MMI->BeginFunction(MF);
3097 // Assumes in correct section after the entry point.
3098 EmitLabel("func_begin", ++SubprogramCount);
3100 // Emit label for the implicitly defined dbg.stoppoint at the start of
3102 if (!Lines.empty()) {
3103 const SrcLineInfo &LineInfo = Lines[0];
3104 Asm->printLabel(LineInfo.getLabelID());
3108 /// EndFunction - Gather and emit post-function debug information.
3110 void EndFunction(MachineFunction *MF) {
3111 if (!ShouldEmitDwarfDebug()) return;
3113 // Define end label for subprogram.
3114 EmitLabel("func_end", SubprogramCount);
3116 // Get function line info.
3117 if (!Lines.empty()) {
3118 // Get section line info.
3119 unsigned ID = SectionMap.insert(Asm->CurrentSection_);
3120 if (SectionSourceLines.size() < ID) SectionSourceLines.resize(ID);
3121 std::vector<SrcLineInfo> &SectionLineInfos = SectionSourceLines[ID-1];
3122 // Append the function info to section info.
3123 SectionLineInfos.insert(SectionLineInfos.end(),
3124 Lines.begin(), Lines.end());
3127 // Construct scopes for subprogram.
3129 ConstructRootDbgScope(RootDbgScope);
3131 // FIXME: This is wrong. We are essentially getting past a problem with
3132 // debug information not being able to handle unreachable blocks that have
3133 // debug information in them. In particular, those unreachable blocks that
3134 // have "region end" info in them. That situation results in the "root
3135 // scope" not being created. If that's the case, then emit a "default"
3136 // scope, i.e., one that encompasses the whole function. This isn't
3137 // desirable. And a better way of handling this (and all of the debugging
3138 // information) needs to be explored.
3139 ConstructDefaultDbgScope(MF);
3141 DebugFrames.push_back(FunctionDebugFrameInfo(SubprogramCount,
3142 MMI->getFrameMoves()));
3146 delete RootDbgScope;
3147 DbgScopeMap.clear();
3148 RootDbgScope = NULL;
3155 /// ValidDebugInfo - Return true if V represents valid debug info value.
3156 bool ValidDebugInfo(Value *V) {
3163 GlobalVariable *GV = getGlobalVariable(V);
3167 if (!GV->hasInternalLinkage () && !GV->hasLinkOnceLinkage())
3170 DIDescriptor DI(GV);
3171 // Check current version. Allow Version6 for now.
3172 unsigned Version = DI.getVersion();
3173 if (Version != LLVMDebugVersion && Version != LLVMDebugVersion6)
3176 unsigned Tag = DI.getTag();
3178 case DW_TAG_variable:
3179 assert(DIVariable(GV).Verify() && "Invalid DebugInfo value");
3181 case DW_TAG_compile_unit:
3182 assert(DICompileUnit(GV).Verify() && "Invalid DebugInfo value");
3184 case DW_TAG_subprogram:
3185 assert(DISubprogram(GV).Verify() && "Invalid DebugInfo value");
3194 /// RecordSourceLine - Records location information and associates it with a
3195 /// label. Returns a unique label ID used to generate a label and provide
3196 /// correspondence to the source line list.
3197 unsigned RecordSourceLine(Value *V, unsigned Line, unsigned Col) {
3198 CompileUnit *Unit = CompileUnitMap[V];
3199 assert(Unit && "Unable to find CompileUnit");
3200 unsigned ID = MMI->NextLabelID();
3201 Lines.push_back(SrcLineInfo(Line, Col, Unit->getID(), ID));
3205 /// RecordSourceLine - Records location information and associates it with a
3206 /// label. Returns a unique label ID used to generate a label and provide
3207 /// correspondence to the source line list.
3208 unsigned RecordSourceLine(unsigned Line, unsigned Col, unsigned Src) {
3209 unsigned ID = MMI->NextLabelID();
3210 Lines.push_back(SrcLineInfo(Line, Col, Src, ID));
3214 unsigned getRecordSourceLineCount() {
3215 return Lines.size();
3218 /// getNumSourceDirectories - Return the number of source directories in the
3220 unsigned getNumSourceDirectories() const {
3221 return DirectoryNames.size();
3224 /// getSourceDirectoryName - Return the name of the directory corresponding
3226 const std::string &getSourceDirectoryName(unsigned Id) const {
3227 return DirectoryNames[Id - 1];
3230 /// getNumSourceFiles - Return the number of source files in the debug info.
3232 unsigned getNumSourceFiles() const {
3233 return SourceFileNames.size();
3236 /// getSourceFileName - Return the name of the source file corresponding
3238 const std::string &getSourceFileName(unsigned Id) const {
3239 return SourceFileNames[Id - 1];
3242 /// getNumSourceIds - Return the number of unique source ids.
3244 unsigned getNumSourceIds() const {
3245 return SourceIds.size();
3248 /// getSourceDirsectoryAndFileIds - Return the directory and file ids that
3249 /// maps to the source id. Source id starts at 1.
3250 std::pair<unsigned, unsigned>
3251 getSourceDirsectoryAndFileIds(unsigned SId) const {
3252 return SourceIds[SId-1];
3255 /// getOrCreateSourceID - Look up the source id with the given directory and
3256 /// source file names. If none currently exists, create a new id and insert it
3257 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
3259 unsigned getOrCreateSourceID(const std::string &DirName,
3260 const std::string &FileName) {
3262 StringMap<unsigned>::iterator DI = DirectoryIdMap.find(DirName);
3263 if (DI != DirectoryIdMap.end())
3264 DId = DI->getValue();
3266 DId = DirectoryNames.size() + 1;
3267 DirectoryIdMap[DirName] = DId;
3268 DirectoryNames.push_back(DirName);
3272 StringMap<unsigned>::iterator FI = SourceFileIdMap.find(FileName);
3273 if (FI != SourceFileIdMap.end())
3274 FId = FI->getValue();
3276 FId = SourceFileNames.size() + 1;
3277 SourceFileIdMap[FileName] = FId;
3278 SourceFileNames.push_back(FileName);
3281 DenseMap<std::pair<unsigned, unsigned>, unsigned>::iterator SI =
3282 SourceIdMap.find(std::make_pair(DId, FId));
3283 if (SI != SourceIdMap.end())
3285 unsigned SrcId = SourceIds.size() + 1; // DW_AT_decl_file cannot be 0.
3286 SourceIdMap[std::make_pair(DId, FId)] = SrcId;
3287 SourceIds.push_back(std::make_pair(DId, FId));
3291 /// RecordRegionStart - Indicate the start of a region.
3293 unsigned RecordRegionStart(GlobalVariable *V) {
3294 DbgScope *Scope = getOrCreateScope(V);
3295 unsigned ID = MMI->NextLabelID();
3296 if (!Scope->getStartLabelID()) Scope->setStartLabelID(ID);
3300 /// RecordRegionEnd - Indicate the end of a region.
3302 unsigned RecordRegionEnd(GlobalVariable *V) {
3303 DbgScope *Scope = getOrCreateScope(V);
3304 unsigned ID = MMI->NextLabelID();
3305 Scope->setEndLabelID(ID);
3309 /// RecordVariable - Indicate the declaration of a local variable.
3311 void RecordVariable(GlobalVariable *GV, unsigned FrameIndex) {
3312 DIDescriptor Desc(GV);
3313 DbgScope *Scope = NULL;
3314 if (Desc.getTag() == DW_TAG_variable) {
3315 // GV is a global variable.
3316 DIGlobalVariable DG(GV);
3317 Scope = getOrCreateScope(DG.getContext().getGV());
3319 // or GV is a local variable.
3321 Scope = getOrCreateScope(DV.getContext().getGV());
3323 assert(Scope && "Unable to find variable' scope");
3324 DbgVariable *DV = new DbgVariable(DIVariable(GV), FrameIndex);
3325 Scope->AddVariable(DV);
3329 //===----------------------------------------------------------------------===//
3330 /// DwarfException - Emits Dwarf exception handling directives.
3332 class DwarfException : public Dwarf {
3333 struct FunctionEHFrameInfo {
3336 unsigned PersonalityIndex;
3338 bool hasLandingPads;
3339 std::vector<MachineMove> Moves;
3340 const Function * function;
3342 FunctionEHFrameInfo(const std::string &FN, unsigned Num, unsigned P,
3344 const std::vector<MachineMove> &M,
3346 FnName(FN), Number(Num), PersonalityIndex(P),
3347 hasCalls(hC), hasLandingPads(hL), Moves(M), function (f) { }
3350 std::vector<FunctionEHFrameInfo> EHFrames;
3352 /// shouldEmitTable - Per-function flag to indicate if EH tables should
3354 bool shouldEmitTable;
3356 /// shouldEmitMoves - Per-function flag to indicate if frame moves info
3357 /// should be emitted.
3358 bool shouldEmitMoves;
3360 /// shouldEmitTableModule - Per-module flag to indicate if EH tables
3361 /// should be emitted.
3362 bool shouldEmitTableModule;
3364 /// shouldEmitFrameModule - Per-module flag to indicate if frame moves
3365 /// should be emitted.
3366 bool shouldEmitMovesModule;
3368 /// EmitCommonEHFrame - Emit the common eh unwind frame.
3370 void EmitCommonEHFrame(const Function *Personality, unsigned Index) {
3371 // Size and sign of stack growth.
3373 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
3374 TargetFrameInfo::StackGrowsUp ?
3375 TD->getPointerSize() : -TD->getPointerSize();
3377 // Begin eh frame section.
3378 Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
3380 if (!TAI->doesRequireNonLocalEHFrameLabel())
3381 O << TAI->getEHGlobalPrefix();
3382 O << "EH_frame" << Index << ":\n";
3383 EmitLabel("section_eh_frame", Index);
3385 // Define base labels.
3386 EmitLabel("eh_frame_common", Index);
3388 // Define the eh frame length.
3389 EmitDifference("eh_frame_common_end", Index,
3390 "eh_frame_common_begin", Index, true);
3391 Asm->EOL("Length of Common Information Entry");
3394 EmitLabel("eh_frame_common_begin", Index);
3395 Asm->EmitInt32((int)0);
3396 Asm->EOL("CIE Identifier Tag");
3397 Asm->EmitInt8(DW_CIE_VERSION);
3398 Asm->EOL("CIE Version");
3400 // The personality presence indicates that language specific information
3401 // will show up in the eh frame.
3402 Asm->EmitString(Personality ? "zPLR" : "zR");
3403 Asm->EOL("CIE Augmentation");
3405 // Round out reader.
3406 Asm->EmitULEB128Bytes(1);
3407 Asm->EOL("CIE Code Alignment Factor");
3408 Asm->EmitSLEB128Bytes(stackGrowth);
3409 Asm->EOL("CIE Data Alignment Factor");
3410 Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true));
3411 Asm->EOL("CIE Return Address Column");
3413 // If there is a personality, we need to indicate the functions location.
3415 Asm->EmitULEB128Bytes(7);
3416 Asm->EOL("Augmentation Size");
3418 if (TAI->getNeedsIndirectEncoding()) {
3419 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect);
3420 Asm->EOL("Personality (pcrel sdata4 indirect)");
3422 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3423 Asm->EOL("Personality (pcrel sdata4)");
3426 PrintRelDirective(true);
3427 O << TAI->getPersonalityPrefix();
3428 Asm->EmitExternalGlobal((const GlobalVariable *)(Personality));
3429 O << TAI->getPersonalitySuffix();
3430 if (strcmp(TAI->getPersonalitySuffix(), "+4@GOTPCREL"))
3431 O << "-" << TAI->getPCSymbol();
3432 Asm->EOL("Personality");
3434 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3435 Asm->EOL("LSDA Encoding (pcrel sdata4)");
3437 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3438 Asm->EOL("FDE Encoding (pcrel sdata4)");
3440 Asm->EmitULEB128Bytes(1);
3441 Asm->EOL("Augmentation Size");
3443 Asm->EmitInt8(DW_EH_PE_pcrel | DW_EH_PE_sdata4);
3444 Asm->EOL("FDE Encoding (pcrel sdata4)");
3447 // Indicate locations of general callee saved registers in frame.
3448 std::vector<MachineMove> Moves;
3449 RI->getInitialFrameState(Moves);
3450 EmitFrameMoves(NULL, 0, Moves, true);
3452 // On Darwin the linker honors the alignment of eh_frame, which means it
3453 // must be 8-byte on 64-bit targets to match what gcc does. Otherwise
3454 // you get holes which confuse readers of eh_frame.
3455 Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
3457 EmitLabel("eh_frame_common_end", Index);
3462 /// EmitEHFrame - Emit function exception frame information.
3464 void EmitEHFrame(const FunctionEHFrameInfo &EHFrameInfo) {
3465 Function::LinkageTypes linkage = EHFrameInfo.function->getLinkage();
3467 Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
3469 // Externally visible entry into the functions eh frame info.
3470 // If the corresponding function is static, this should not be
3471 // externally visible.
3472 if (linkage != Function::InternalLinkage &&
3473 linkage != Function::PrivateLinkage) {
3474 if (const char *GlobalEHDirective = TAI->getGlobalEHDirective())
3475 O << GlobalEHDirective << EHFrameInfo.FnName << "\n";
3478 // If corresponding function is weak definition, this should be too.
3479 if ((linkage == Function::WeakAnyLinkage ||
3480 linkage == Function::WeakODRLinkage ||
3481 linkage == Function::LinkOnceAnyLinkage ||
3482 linkage == Function::LinkOnceODRLinkage) &&
3483 TAI->getWeakDefDirective())
3484 O << TAI->getWeakDefDirective() << EHFrameInfo.FnName << "\n";
3486 // If there are no calls then you can't unwind. This may mean we can
3487 // omit the EH Frame, but some environments do not handle weak absolute
3489 // If UnwindTablesMandatory is set we cannot do this optimization; the
3490 // unwind info is to be available for non-EH uses.
3491 if (!EHFrameInfo.hasCalls &&
3492 !UnwindTablesMandatory &&
3493 ((linkage != Function::WeakAnyLinkage &&
3494 linkage != Function::WeakODRLinkage &&
3495 linkage != Function::LinkOnceAnyLinkage &&
3496 linkage != Function::LinkOnceODRLinkage) ||
3497 !TAI->getWeakDefDirective() ||
3498 TAI->getSupportsWeakOmittedEHFrame()))
3500 O << EHFrameInfo.FnName << " = 0\n";
3501 // This name has no connection to the function, so it might get
3502 // dead-stripped when the function is not, erroneously. Prohibit
3503 // dead-stripping unconditionally.
3504 if (const char *UsedDirective = TAI->getUsedDirective())
3505 O << UsedDirective << EHFrameInfo.FnName << "\n\n";
3507 O << EHFrameInfo.FnName << ":\n";
3510 EmitDifference("eh_frame_end", EHFrameInfo.Number,
3511 "eh_frame_begin", EHFrameInfo.Number, true);
3512 Asm->EOL("Length of Frame Information Entry");
3514 EmitLabel("eh_frame_begin", EHFrameInfo.Number);
3516 if (TAI->doesRequireNonLocalEHFrameLabel()) {
3517 PrintRelDirective(true, true);
3518 PrintLabelName("eh_frame_begin", EHFrameInfo.Number);
3520 if (!TAI->isAbsoluteEHSectionOffsets())
3521 O << "-EH_frame" << EHFrameInfo.PersonalityIndex;
3523 EmitSectionOffset("eh_frame_begin", "eh_frame_common",
3524 EHFrameInfo.Number, EHFrameInfo.PersonalityIndex,
3528 Asm->EOL("FDE CIE offset");
3530 EmitReference("eh_func_begin", EHFrameInfo.Number, true, true);
3531 Asm->EOL("FDE initial location");
3532 EmitDifference("eh_func_end", EHFrameInfo.Number,
3533 "eh_func_begin", EHFrameInfo.Number, true);
3534 Asm->EOL("FDE address range");
3536 // If there is a personality and landing pads then point to the language
3537 // specific data area in the exception table.
3538 if (EHFrameInfo.PersonalityIndex) {
3539 Asm->EmitULEB128Bytes(4);
3540 Asm->EOL("Augmentation size");
3542 if (EHFrameInfo.hasLandingPads)
3543 EmitReference("exception", EHFrameInfo.Number, true, true);
3545 Asm->EmitInt32((int)0);
3546 Asm->EOL("Language Specific Data Area");
3548 Asm->EmitULEB128Bytes(0);
3549 Asm->EOL("Augmentation size");
3552 // Indicate locations of function specific callee saved registers in
3554 EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves,
3557 // On Darwin the linker honors the alignment of eh_frame, which means it
3558 // must be 8-byte on 64-bit targets to match what gcc does. Otherwise
3559 // you get holes which confuse readers of eh_frame.
3560 Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
3562 EmitLabel("eh_frame_end", EHFrameInfo.Number);
3564 // If the function is marked used, this table should be also. We cannot
3565 // make the mark unconditional in this case, since retaining the table
3566 // also retains the function in this case, and there is code around
3567 // that depends on unused functions (calling undefined externals) being
3568 // dead-stripped to link correctly. Yes, there really is.
3569 if (MMI->getUsedFunctions().count(EHFrameInfo.function))
3570 if (const char *UsedDirective = TAI->getUsedDirective())
3571 O << UsedDirective << EHFrameInfo.FnName << "\n\n";
3575 /// EmitExceptionTable - Emit landing pads and actions.
3577 /// The general organization of the table is complex, but the basic concepts
3578 /// are easy. First there is a header which describes the location and
3579 /// organization of the three components that follow.
3580 /// 1. The landing pad site information describes the range of code covered
3581 /// by the try. In our case it's an accumulation of the ranges covered
3582 /// by the invokes in the try. There is also a reference to the landing
3583 /// pad that handles the exception once processed. Finally an index into
3584 /// the actions table.
3585 /// 2. The action table, in our case, is composed of pairs of type ids
3586 /// and next action offset. Starting with the action index from the
3587 /// landing pad site, each type Id is checked for a match to the current
3588 /// exception. If it matches then the exception and type id are passed
3589 /// on to the landing pad. Otherwise the next action is looked up. This
3590 /// chain is terminated with a next action of zero. If no type id is
3591 /// found the the frame is unwound and handling continues.
3592 /// 3. Type id table contains references to all the C++ typeinfo for all
3593 /// catches in the function. This tables is reversed indexed base 1.
3595 /// SharedTypeIds - How many leading type ids two landing pads have in common.
3596 static unsigned SharedTypeIds(const LandingPadInfo *L,
3597 const LandingPadInfo *R) {
3598 const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
3599 unsigned LSize = LIds.size(), RSize = RIds.size();
3600 unsigned MinSize = LSize < RSize ? LSize : RSize;
3603 for (; Count != MinSize; ++Count)
3604 if (LIds[Count] != RIds[Count])
3610 /// PadLT - Order landing pads lexicographically by type id.
3611 static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R) {
3612 const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
3613 unsigned LSize = LIds.size(), RSize = RIds.size();
3614 unsigned MinSize = LSize < RSize ? LSize : RSize;
3616 for (unsigned i = 0; i != MinSize; ++i)
3617 if (LIds[i] != RIds[i])
3618 return LIds[i] < RIds[i];
3620 return LSize < RSize;
3624 static inline unsigned getEmptyKey() { return -1U; }
3625 static inline unsigned getTombstoneKey() { return -2U; }
3626 static unsigned getHashValue(const unsigned &Key) { return Key; }
3627 static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
3628 static bool isPod() { return true; }
3631 /// ActionEntry - Structure describing an entry in the actions table.
3632 struct ActionEntry {
3633 int ValueForTypeID; // The value to write - may not be equal to the type id.
3635 struct ActionEntry *Previous;
3638 /// PadRange - Structure holding a try-range and the associated landing pad.
3640 // The index of the landing pad.
3642 // The index of the begin and end labels in the landing pad's label lists.
3643 unsigned RangeIndex;
3646 typedef DenseMap<unsigned, PadRange, KeyInfo> RangeMapType;
3648 /// CallSiteEntry - Structure describing an entry in the call-site table.
3649 struct CallSiteEntry {
3650 // The 'try-range' is BeginLabel .. EndLabel.
3651 unsigned BeginLabel; // zero indicates the start of the function.
3652 unsigned EndLabel; // zero indicates the end of the function.
3653 // The landing pad starts at PadLabel.
3654 unsigned PadLabel; // zero indicates that there is no landing pad.
3658 void EmitExceptionTable() {
3659 const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
3660 const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
3661 const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
3662 if (PadInfos.empty()) return;
3664 // Sort the landing pads in order of their type ids. This is used to fold
3665 // duplicate actions.
3666 SmallVector<const LandingPadInfo *, 64> LandingPads;
3667 LandingPads.reserve(PadInfos.size());
3668 for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
3669 LandingPads.push_back(&PadInfos[i]);
3670 std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
3672 // Negative type ids index into FilterIds, positive type ids index into
3673 // TypeInfos. The value written for a positive type id is just the type
3674 // id itself. For a negative type id, however, the value written is the
3675 // (negative) byte offset of the corresponding FilterIds entry. The byte
3676 // offset is usually equal to the type id, because the FilterIds entries
3677 // are written using a variable width encoding which outputs one byte per
3678 // entry as long as the value written is not too large, but can differ.
3679 // This kind of complication does not occur for positive type ids because
3680 // type infos are output using a fixed width encoding.
3681 // FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
3682 SmallVector<int, 16> FilterOffsets;
3683 FilterOffsets.reserve(FilterIds.size());
3685 for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
3686 E = FilterIds.end(); I != E; ++I) {
3687 FilterOffsets.push_back(Offset);
3688 Offset -= TargetAsmInfo::getULEB128Size(*I);
3691 // Compute the actions table and gather the first action index for each
3692 // landing pad site.
3693 SmallVector<ActionEntry, 32> Actions;
3694 SmallVector<unsigned, 64> FirstActions;
3695 FirstActions.reserve(LandingPads.size());
3697 int FirstAction = 0;
3698 unsigned SizeActions = 0;
3699 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
3700 const LandingPadInfo *LP = LandingPads[i];
3701 const std::vector<int> &TypeIds = LP->TypeIds;
3702 const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
3703 unsigned SizeSiteActions = 0;
3705 if (NumShared < TypeIds.size()) {
3706 unsigned SizeAction = 0;
3707 ActionEntry *PrevAction = 0;
3710 const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
3711 assert(Actions.size());
3712 PrevAction = &Actions.back();
3713 SizeAction = TargetAsmInfo::getSLEB128Size(PrevAction->NextAction) +
3714 TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
3715 for (unsigned j = NumShared; j != SizePrevIds; ++j) {
3717 TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
3718 SizeAction += -PrevAction->NextAction;
3719 PrevAction = PrevAction->Previous;
3723 // Compute the actions.
3724 for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
3725 int TypeID = TypeIds[I];
3726 assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
3727 int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
3728 unsigned SizeTypeID = TargetAsmInfo::getSLEB128Size(ValueForTypeID);
3730 int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
3731 SizeAction = SizeTypeID + TargetAsmInfo::getSLEB128Size(NextAction);
3732 SizeSiteActions += SizeAction;
3734 ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
3735 Actions.push_back(Action);
3737 PrevAction = &Actions.back();
3740 // Record the first action of the landing pad site.
3741 FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
3742 } // else identical - re-use previous FirstAction
3744 FirstActions.push_back(FirstAction);
3746 // Compute this sites contribution to size.
3747 SizeActions += SizeSiteActions;
3750 // Compute the call-site table. The entry for an invoke has a try-range
3751 // containing the call, a non-zero landing pad and an appropriate action.
3752 // The entry for an ordinary call has a try-range containing the call and
3753 // zero for the landing pad and the action. Calls marked 'nounwind' have
3754 // no entry and must not be contained in the try-range of any entry - they
3755 // form gaps in the table. Entries must be ordered by try-range address.
3756 SmallVector<CallSiteEntry, 64> CallSites;
3758 RangeMapType PadMap;
3759 // Invokes and nounwind calls have entries in PadMap (due to being bracketed
3760 // by try-range labels when lowered). Ordinary calls do not, so appropriate
3761 // try-ranges for them need be deduced.
3762 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
3763 const LandingPadInfo *LandingPad = LandingPads[i];
3764 for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
3765 unsigned BeginLabel = LandingPad->BeginLabels[j];
3766 assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
3767 PadRange P = { i, j };
3768 PadMap[BeginLabel] = P;
3772 // The end label of the previous invoke or nounwind try-range.
3773 unsigned LastLabel = 0;
3775 // Whether there is a potentially throwing instruction (currently this means
3776 // an ordinary call) between the end of the previous try-range and now.
3777 bool SawPotentiallyThrowing = false;
3779 // Whether the last callsite entry was for an invoke.
3780 bool PreviousIsInvoke = false;
3782 // Visit all instructions in order of address.
3783 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
3785 for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
3787 if (!MI->isLabel()) {
3788 SawPotentiallyThrowing |= MI->getDesc().isCall();
3792 unsigned BeginLabel = MI->getOperand(0).getImm();
3793 assert(BeginLabel && "Invalid label!");
3795 // End of the previous try-range?
3796 if (BeginLabel == LastLabel)
3797 SawPotentiallyThrowing = false;
3799 // Beginning of a new try-range?
3800 RangeMapType::iterator L = PadMap.find(BeginLabel);
3801 if (L == PadMap.end())
3802 // Nope, it was just some random label.
3805 PadRange P = L->second;
3806 const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
3808 assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
3809 "Inconsistent landing pad map!");
3811 // If some instruction between the previous try-range and this one may
3812 // throw, create a call-site entry with no landing pad for the region
3813 // between the try-ranges.
3814 if (SawPotentiallyThrowing) {
3815 CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
3816 CallSites.push_back(Site);
3817 PreviousIsInvoke = false;
3820 LastLabel = LandingPad->EndLabels[P.RangeIndex];
3821 assert(BeginLabel && LastLabel && "Invalid landing pad!");
3823 if (LandingPad->LandingPadLabel) {
3824 // This try-range is for an invoke.
3825 CallSiteEntry Site = {BeginLabel, LastLabel,
3826 LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
3828 // Try to merge with the previous call-site.
3829 if (PreviousIsInvoke) {
3830 CallSiteEntry &Prev = CallSites.back();
3831 if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
3832 // Extend the range of the previous entry.
3833 Prev.EndLabel = Site.EndLabel;
3838 // Otherwise, create a new call-site.
3839 CallSites.push_back(Site);
3840 PreviousIsInvoke = true;
3843 PreviousIsInvoke = false;
3847 // If some instruction between the previous try-range and the end of the
3848 // function may throw, create a call-site entry with no landing pad for the
3849 // region following the try-range.
3850 if (SawPotentiallyThrowing) {
3851 CallSiteEntry Site = {LastLabel, 0, 0, 0};
3852 CallSites.push_back(Site);
3858 const unsigned SiteStartSize = sizeof(int32_t); // DW_EH_PE_udata4
3859 const unsigned SiteLengthSize = sizeof(int32_t); // DW_EH_PE_udata4
3860 const unsigned LandingPadSize = sizeof(int32_t); // DW_EH_PE_udata4
3861 unsigned SizeSites = CallSites.size() * (SiteStartSize +
3864 for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
3865 SizeSites += TargetAsmInfo::getULEB128Size(CallSites[i].Action);
3868 const unsigned TypeInfoSize = TD->getPointerSize(); // DW_EH_PE_absptr
3869 unsigned SizeTypes = TypeInfos.size() * TypeInfoSize;
3871 unsigned TypeOffset = sizeof(int8_t) + // Call site format
3872 TargetAsmInfo::getULEB128Size(SizeSites) + // Call-site table length
3873 SizeSites + SizeActions + SizeTypes;
3875 unsigned TotalSize = sizeof(int8_t) + // LPStart format
3876 sizeof(int8_t) + // TType format
3877 TargetAsmInfo::getULEB128Size(TypeOffset) + // TType base offset
3880 unsigned SizeAlign = (4 - TotalSize) & 3;
3882 // Begin the exception table.
3883 Asm->SwitchToDataSection(TAI->getDwarfExceptionSection());
3884 Asm->EmitAlignment(2, 0, 0, false);
3885 O << "GCC_except_table" << SubprogramCount << ":\n";
3886 for (unsigned i = 0; i != SizeAlign; ++i) {
3888 Asm->EOL("Padding");
3890 EmitLabel("exception", SubprogramCount);
3893 Asm->EmitInt8(DW_EH_PE_omit);
3894 Asm->EOL("LPStart format (DW_EH_PE_omit)");
3895 Asm->EmitInt8(DW_EH_PE_absptr);
3896 Asm->EOL("TType format (DW_EH_PE_absptr)");
3897 Asm->EmitULEB128Bytes(TypeOffset);
3898 Asm->EOL("TType base offset");
3899 Asm->EmitInt8(DW_EH_PE_udata4);
3900 Asm->EOL("Call site format (DW_EH_PE_udata4)");
3901 Asm->EmitULEB128Bytes(SizeSites);
3902 Asm->EOL("Call-site table length");
3904 // Emit the landing pad site information.
3905 for (unsigned i = 0; i < CallSites.size(); ++i) {
3906 CallSiteEntry &S = CallSites[i];
3907 const char *BeginTag;
3908 unsigned BeginNumber;
3910 if (!S.BeginLabel) {
3911 BeginTag = "eh_func_begin";
3912 BeginNumber = SubprogramCount;
3915 BeginNumber = S.BeginLabel;
3918 EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount,
3920 Asm->EOL("Region start");
3923 EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber,
3926 EmitDifference("label", S.EndLabel, BeginTag, BeginNumber, true);
3928 Asm->EOL("Region length");
3933 EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount,
3935 Asm->EOL("Landing pad");
3937 Asm->EmitULEB128Bytes(S.Action);
3941 // Emit the actions.
3942 for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
3943 ActionEntry &Action = Actions[I];
3945 Asm->EmitSLEB128Bytes(Action.ValueForTypeID);
3946 Asm->EOL("TypeInfo index");
3947 Asm->EmitSLEB128Bytes(Action.NextAction);
3948 Asm->EOL("Next action");
3951 // Emit the type ids.
3952 for (unsigned M = TypeInfos.size(); M; --M) {
3953 GlobalVariable *GV = TypeInfos[M - 1];
3955 PrintRelDirective();
3958 O << Asm->getGlobalLinkName(GV);
3962 Asm->EOL("TypeInfo");
3965 // Emit the filter typeids.
3966 for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
3967 unsigned TypeID = FilterIds[j];
3968 Asm->EmitULEB128Bytes(TypeID);
3969 Asm->EOL("Filter TypeInfo index");
3972 Asm->EmitAlignment(2, 0, 0, false);
3976 //===--------------------------------------------------------------------===//
3977 // Main entry points.
3979 DwarfException(raw_ostream &OS, AsmPrinter *A, const TargetAsmInfo *T)
3980 : Dwarf(OS, A, T, "eh")
3981 , shouldEmitTable(false)
3982 , shouldEmitMoves(false)
3983 , shouldEmitTableModule(false)
3984 , shouldEmitMovesModule(false)
3987 virtual ~DwarfException() {}
3989 /// SetModuleInfo - Set machine module information when it's known that pass
3990 /// manager has created it. Set by the target AsmPrinter.
3991 void SetModuleInfo(MachineModuleInfo *mmi) {
3995 /// BeginModule - Emit all exception information that should come prior to the
3997 void BeginModule(Module *M) {
4001 /// EndModule - Emit all exception information that should come after the
4004 if (shouldEmitMovesModule || shouldEmitTableModule) {
4005 const std::vector<Function *> Personalities = MMI->getPersonalities();
4006 for (unsigned i = 0; i < Personalities.size(); ++i)
4007 EmitCommonEHFrame(Personalities[i], i);
4009 for (std::vector<FunctionEHFrameInfo>::iterator I = EHFrames.begin(),
4010 E = EHFrames.end(); I != E; ++I)
4015 /// BeginFunction - Gather pre-function exception information. Assumes being
4016 /// emitted immediately after the function entry point.
4017 void BeginFunction(MachineFunction *MF) {
4019 shouldEmitTable = shouldEmitMoves = false;
4020 if (MMI && TAI->doesSupportExceptionHandling()) {
4022 // Map all labels and get rid of any dead landing pads.
4023 MMI->TidyLandingPads();
4024 // If any landing pads survive, we need an EH table.
4025 if (MMI->getLandingPads().size())
4026 shouldEmitTable = true;
4028 // See if we need frame move info.
4029 if (!MF->getFunction()->doesNotThrow() || UnwindTablesMandatory)
4030 shouldEmitMoves = true;
4032 if (shouldEmitMoves || shouldEmitTable)
4033 // Assumes in correct section after the entry point.
4034 EmitLabel("eh_func_begin", ++SubprogramCount);
4036 shouldEmitTableModule |= shouldEmitTable;
4037 shouldEmitMovesModule |= shouldEmitMoves;
4040 /// EndFunction - Gather and emit post-function exception information.
4042 void EndFunction() {
4043 if (shouldEmitMoves || shouldEmitTable) {
4044 EmitLabel("eh_func_end", SubprogramCount);
4045 EmitExceptionTable();
4047 // Save EH frame information
4049 push_back(FunctionEHFrameInfo(getAsm()->getCurrentFunctionEHName(MF),
4051 MMI->getPersonalityIndex(),
4052 MF->getFrameInfo()->hasCalls(),
4053 !MMI->getLandingPads().empty(),
4054 MMI->getFrameMoves(),
4055 MF->getFunction()));
4060 } // End of namespace llvm
4062 //===----------------------------------------------------------------------===//
4064 /// Emit - Print the abbreviation using the specified Dwarf writer.
4066 void DIEAbbrev::Emit(const DwarfDebug &DD) const {
4067 // Emit its Dwarf tag type.
4068 DD.getAsm()->EmitULEB128Bytes(Tag);
4069 DD.getAsm()->EOL(TagString(Tag));
4071 // Emit whether it has children DIEs.
4072 DD.getAsm()->EmitULEB128Bytes(ChildrenFlag);
4073 DD.getAsm()->EOL(ChildrenString(ChildrenFlag));
4075 // For each attribute description.
4076 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4077 const DIEAbbrevData &AttrData = Data[i];
4079 // Emit attribute type.
4080 DD.getAsm()->EmitULEB128Bytes(AttrData.getAttribute());
4081 DD.getAsm()->EOL(AttributeString(AttrData.getAttribute()));
4084 DD.getAsm()->EmitULEB128Bytes(AttrData.getForm());
4085 DD.getAsm()->EOL(FormEncodingString(AttrData.getForm()));
4088 // Mark end of abbreviation.
4089 DD.getAsm()->EmitULEB128Bytes(0); DD.getAsm()->EOL("EOM(1)");
4090 DD.getAsm()->EmitULEB128Bytes(0); DD.getAsm()->EOL("EOM(2)");
4094 void DIEAbbrev::print(std::ostream &O) {
4095 O << "Abbreviation @"
4096 << std::hex << (intptr_t)this << std::dec
4100 << ChildrenString(ChildrenFlag)
4103 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4105 << AttributeString(Data[i].getAttribute())
4107 << FormEncodingString(Data[i].getForm())
4111 void DIEAbbrev::dump() { print(cerr); }
4114 //===----------------------------------------------------------------------===//
4117 void DIEValue::dump() {
4122 //===----------------------------------------------------------------------===//
4124 /// EmitValue - Emit integer of appropriate size.
4126 void DIEInteger::EmitValue(DwarfDebug &DD, unsigned Form) {
4128 case DW_FORM_flag: // Fall thru
4129 case DW_FORM_ref1: // Fall thru
4130 case DW_FORM_data1: DD.getAsm()->EmitInt8(Integer); break;
4131 case DW_FORM_ref2: // Fall thru
4132 case DW_FORM_data2: DD.getAsm()->EmitInt16(Integer); break;
4133 case DW_FORM_ref4: // Fall thru
4134 case DW_FORM_data4: DD.getAsm()->EmitInt32(Integer); break;
4135 case DW_FORM_ref8: // Fall thru
4136 case DW_FORM_data8: DD.getAsm()->EmitInt64(Integer); break;
4137 case DW_FORM_udata: DD.getAsm()->EmitULEB128Bytes(Integer); break;
4138 case DW_FORM_sdata: DD.getAsm()->EmitSLEB128Bytes(Integer); break;
4139 default: assert(0 && "DIE Value form not supported yet"); break;
4143 /// SizeOf - Determine size of integer value in bytes.
4145 unsigned DIEInteger::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4147 case DW_FORM_flag: // Fall thru
4148 case DW_FORM_ref1: // Fall thru
4149 case DW_FORM_data1: return sizeof(int8_t);
4150 case DW_FORM_ref2: // Fall thru
4151 case DW_FORM_data2: return sizeof(int16_t);
4152 case DW_FORM_ref4: // Fall thru
4153 case DW_FORM_data4: return sizeof(int32_t);
4154 case DW_FORM_ref8: // Fall thru
4155 case DW_FORM_data8: return sizeof(int64_t);
4156 case DW_FORM_udata: return TargetAsmInfo::getULEB128Size(Integer);
4157 case DW_FORM_sdata: return TargetAsmInfo::getSLEB128Size(Integer);
4158 default: assert(0 && "DIE Value form not supported yet"); break;
4163 //===----------------------------------------------------------------------===//
4165 /// EmitValue - Emit string value.
4167 void DIEString::EmitValue(DwarfDebug &DD, unsigned Form) {
4168 DD.getAsm()->EmitString(String);
4171 //===----------------------------------------------------------------------===//
4173 /// EmitValue - Emit label value.
4175 void DIEDwarfLabel::EmitValue(DwarfDebug &DD, unsigned Form) {
4176 bool IsSmall = Form == DW_FORM_data4;
4177 DD.EmitReference(Label, false, IsSmall);
4180 /// SizeOf - Determine size of label value in bytes.
4182 unsigned DIEDwarfLabel::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4183 if (Form == DW_FORM_data4) return 4;
4184 return DD.getTargetData()->getPointerSize();
4187 //===----------------------------------------------------------------------===//
4189 /// EmitValue - Emit label value.
4191 void DIEObjectLabel::EmitValue(DwarfDebug &DD, unsigned Form) {
4192 bool IsSmall = Form == DW_FORM_data4;
4193 DD.EmitReference(Label, false, IsSmall);
4196 /// SizeOf - Determine size of label value in bytes.
4198 unsigned DIEObjectLabel::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4199 if (Form == DW_FORM_data4) return 4;
4200 return DD.getTargetData()->getPointerSize();
4203 //===----------------------------------------------------------------------===//
4205 /// EmitValue - Emit delta value.
4207 void DIESectionOffset::EmitValue(DwarfDebug &DD, unsigned Form) {
4208 bool IsSmall = Form == DW_FORM_data4;
4209 DD.EmitSectionOffset(Label.Tag, Section.Tag,
4210 Label.Number, Section.Number, IsSmall, IsEH, UseSet);
4213 /// SizeOf - Determine size of delta value in bytes.
4215 unsigned DIESectionOffset::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4216 if (Form == DW_FORM_data4) return 4;
4217 return DD.getTargetData()->getPointerSize();
4220 //===----------------------------------------------------------------------===//
4222 /// EmitValue - Emit delta value.
4224 void DIEDelta::EmitValue(DwarfDebug &DD, unsigned Form) {
4225 bool IsSmall = Form == DW_FORM_data4;
4226 DD.EmitDifference(LabelHi, LabelLo, IsSmall);
4229 /// SizeOf - Determine size of delta value in bytes.
4231 unsigned DIEDelta::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4232 if (Form == DW_FORM_data4) return 4;
4233 return DD.getTargetData()->getPointerSize();
4236 //===----------------------------------------------------------------------===//
4238 /// EmitValue - Emit debug information entry offset.
4240 void DIEntry::EmitValue(DwarfDebug &DD, unsigned Form) {
4241 DD.getAsm()->EmitInt32(Entry->getOffset());
4244 //===----------------------------------------------------------------------===//
4246 /// ComputeSize - calculate the size of the block.
4248 unsigned DIEBlock::ComputeSize(DwarfDebug &DD) {
4250 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
4252 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
4253 Size += Values[i]->SizeOf(DD, AbbrevData[i].getForm());
4259 /// EmitValue - Emit block data.
4261 void DIEBlock::EmitValue(DwarfDebug &DD, unsigned Form) {
4263 case DW_FORM_block1: DD.getAsm()->EmitInt8(Size); break;
4264 case DW_FORM_block2: DD.getAsm()->EmitInt16(Size); break;
4265 case DW_FORM_block4: DD.getAsm()->EmitInt32(Size); break;
4266 case DW_FORM_block: DD.getAsm()->EmitULEB128Bytes(Size); break;
4267 default: assert(0 && "Improper form for block"); break;
4270 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData();
4272 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
4274 Values[i]->EmitValue(DD, AbbrevData[i].getForm());
4278 /// SizeOf - Determine size of block data in bytes.
4280 unsigned DIEBlock::SizeOf(const DwarfDebug &DD, unsigned Form) const {
4282 case DW_FORM_block1: return Size + sizeof(int8_t);
4283 case DW_FORM_block2: return Size + sizeof(int16_t);
4284 case DW_FORM_block4: return Size + sizeof(int32_t);
4285 case DW_FORM_block: return Size + TargetAsmInfo::getULEB128Size(Size);
4286 default: assert(0 && "Improper form for block"); break;
4291 //===----------------------------------------------------------------------===//
4292 /// DIE Implementation
4295 for (unsigned i = 0, N = Children.size(); i < N; ++i)
4299 /// AddSiblingOffset - Add a sibling offset field to the front of the DIE.
4301 void DIE::AddSiblingOffset() {
4302 DIEInteger *DI = new DIEInteger(0);
4303 Values.insert(Values.begin(), DI);
4304 Abbrev.AddFirstAttribute(DW_AT_sibling, DW_FORM_ref4);
4307 /// Profile - Used to gather unique data for the value folding set.
4309 void DIE::Profile(FoldingSetNodeID &ID) {
4312 for (unsigned i = 0, N = Children.size(); i < N; ++i)
4313 ID.AddPointer(Children[i]);
4315 for (unsigned j = 0, M = Values.size(); j < M; ++j)
4316 ID.AddPointer(Values[j]);
4320 void DIE::print(std::ostream &O, unsigned IncIndent) {
4321 static unsigned IndentCount = 0;
4322 IndentCount += IncIndent;
4323 const std::string Indent(IndentCount, ' ');
4324 bool isBlock = Abbrev.getTag() == 0;
4329 << "0x" << std::hex << (intptr_t)this << std::dec
4330 << ", Offset: " << Offset
4331 << ", Size: " << Size
4335 << TagString(Abbrev.getTag())
4337 << ChildrenString(Abbrev.getChildrenFlag());
4339 O << "Size: " << Size;
4343 const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData();
4346 for (unsigned i = 0, N = Data.size(); i < N; ++i) {
4350 O << AttributeString(Data[i].getAttribute());
4352 O << "Blk[" << i << "]";
4355 << FormEncodingString(Data[i].getForm())
4357 Values[i]->print(O);
4362 for (unsigned j = 0, M = Children.size(); j < M; ++j) {
4363 Children[j]->print(O, 4);
4366 if (!isBlock) O << "\n";
4367 IndentCount -= IncIndent;
4375 //===----------------------------------------------------------------------===//
4376 /// DwarfWriter Implementation
4379 DwarfWriter::DwarfWriter()
4380 : ImmutablePass(&ID), DD(0), DE(0), DwarfTimer(0) {
4381 if (TimePassesIsEnabled)
4382 DwarfTimer = new Timer("Dwarf Writer", *getDwarfTimerGroup());
4385 DwarfWriter::~DwarfWriter() {
4389 delete DwarfTimerGroup; DwarfTimerGroup = 0;
4392 /// BeginModule - Emit all Dwarf sections that should come prior to the
4394 void DwarfWriter::BeginModule(Module *M,
4395 MachineModuleInfo *MMI,
4396 raw_ostream &OS, AsmPrinter *A,
4397 const TargetAsmInfo *T) {
4398 if (TimePassesIsEnabled)
4399 DwarfTimer->startTimer();
4401 DE = new DwarfException(OS, A, T);
4402 DD = new DwarfDebug(OS, A, T);
4405 DD->SetDebugInfo(MMI);
4406 DE->SetModuleInfo(MMI);
4408 if (TimePassesIsEnabled)
4409 DwarfTimer->stopTimer();
4412 /// EndModule - Emit all Dwarf sections that should come after the content.
4414 void DwarfWriter::EndModule() {
4415 if (TimePassesIsEnabled)
4416 DwarfTimer->startTimer();
4421 if (TimePassesIsEnabled)
4422 DwarfTimer->stopTimer();
4425 /// BeginFunction - Gather pre-function debug information. Assumes being
4426 /// emitted immediately after the function entry point.
4427 void DwarfWriter::BeginFunction(MachineFunction *MF) {
4428 if (TimePassesIsEnabled)
4429 DwarfTimer->startTimer();
4431 DE->BeginFunction(MF);
4432 DD->BeginFunction(MF);
4434 if (TimePassesIsEnabled)
4435 DwarfTimer->stopTimer();
4438 /// EndFunction - Gather and emit post-function debug information.
4440 void DwarfWriter::EndFunction(MachineFunction *MF) {
4441 if (TimePassesIsEnabled)
4442 DwarfTimer->startTimer();
4444 DD->EndFunction(MF);
4447 if (MachineModuleInfo *MMI = DD->getMMI() ? DD->getMMI() : DE->getMMI())
4448 // Clear function debug information.
4451 if (TimePassesIsEnabled)
4452 DwarfTimer->stopTimer();
4455 /// ValidDebugInfo - Return true if V represents valid debug info value.
4456 bool DwarfWriter::ValidDebugInfo(Value *V) {
4457 if (TimePassesIsEnabled)
4458 DwarfTimer->startTimer();
4460 bool Res = DD && DD->ValidDebugInfo(V);
4462 if (TimePassesIsEnabled)
4463 DwarfTimer->stopTimer();
4468 /// RecordSourceLine - Records location information and associates it with a
4469 /// label. Returns a unique label ID used to generate a label and provide
4470 /// correspondence to the source line list.
4471 unsigned DwarfWriter::RecordSourceLine(unsigned Line, unsigned Col,
4473 if (TimePassesIsEnabled)
4474 DwarfTimer->startTimer();
4476 unsigned Res = DD->RecordSourceLine(Line, Col, Src);
4478 if (TimePassesIsEnabled)
4479 DwarfTimer->stopTimer();
4484 /// getOrCreateSourceID - Look up the source id with the given directory and
4485 /// source file names. If none currently exists, create a new id and insert it
4486 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
4488 unsigned DwarfWriter::getOrCreateSourceID(const std::string &DirName,
4489 const std::string &FileName) {
4490 if (TimePassesIsEnabled)
4491 DwarfTimer->startTimer();
4493 unsigned Res = DD->getOrCreateSourceID(DirName, FileName);
4495 if (TimePassesIsEnabled)
4496 DwarfTimer->stopTimer();
4501 /// RecordRegionStart - Indicate the start of a region.
4502 unsigned DwarfWriter::RecordRegionStart(GlobalVariable *V) {
4503 if (TimePassesIsEnabled)
4504 DwarfTimer->startTimer();
4506 unsigned Res = DD->RecordRegionStart(V);
4508 if (TimePassesIsEnabled)
4509 DwarfTimer->stopTimer();
4514 /// RecordRegionEnd - Indicate the end of a region.
4515 unsigned DwarfWriter::RecordRegionEnd(GlobalVariable *V) {
4516 if (TimePassesIsEnabled)
4517 DwarfTimer->startTimer();
4519 unsigned Res = DD->RecordRegionEnd(V);
4521 if (TimePassesIsEnabled)
4522 DwarfTimer->stopTimer();
4527 /// getRecordSourceLineCount - Count source lines.
4528 unsigned DwarfWriter::getRecordSourceLineCount() {
4529 if (TimePassesIsEnabled)
4530 DwarfTimer->startTimer();
4532 unsigned Res = DD->getRecordSourceLineCount();
4534 if (TimePassesIsEnabled)
4535 DwarfTimer->stopTimer();
4540 /// RecordVariable - Indicate the declaration of a local variable.
4542 void DwarfWriter::RecordVariable(GlobalVariable *GV, unsigned FrameIndex) {
4543 if (TimePassesIsEnabled)
4544 DwarfTimer->startTimer();
4546 DD->RecordVariable(GV, FrameIndex);
4548 if (TimePassesIsEnabled)
4549 DwarfTimer->stopTimer();
4552 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
4554 bool DwarfWriter::ShouldEmitDwarfDebug() const {
4555 if (TimePassesIsEnabled)
4556 DwarfTimer->startTimer();
4558 bool Res = DD->ShouldEmitDwarfDebug();
4560 if (TimePassesIsEnabled)
4561 DwarfTimer->stopTimer();