1 //===-- llvm/CodeGen/DwarfDebug.cpp - Dwarf Debug Framework ---------------===//
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 debug info into asm files.
12 //===----------------------------------------------------------------------===//
13 #define DEBUG_TYPE "dwarfdebug"
14 #include "DwarfDebug.h"
15 #include "llvm/Module.h"
16 #include "llvm/CodeGen/MachineFunction.h"
17 #include "llvm/CodeGen/MachineModuleInfo.h"
18 #include "llvm/MC/MCSection.h"
19 #include "llvm/MC/MCStreamer.h"
20 #include "llvm/MC/MCAsmInfo.h"
21 #include "llvm/Target/TargetData.h"
22 #include "llvm/Target/TargetFrameInfo.h"
23 #include "llvm/Target/TargetLoweringObjectFile.h"
24 #include "llvm/Target/TargetRegisterInfo.h"
25 #include "llvm/ADT/StringExtras.h"
26 #include "llvm/Support/Mangler.h"
27 #include "llvm/Support/Timer.h"
28 #include "llvm/Support/Debug.h"
29 #include "llvm/System/Path.h"
32 static TimerGroup &getDwarfTimerGroup() {
33 static TimerGroup DwarfTimerGroup("Dwarf Debugging");
34 return DwarfTimerGroup;
37 //===----------------------------------------------------------------------===//
39 /// Configuration values for initial hash set sizes (log2).
41 static const unsigned InitDiesSetSize = 9; // log2(512)
42 static const unsigned InitAbbreviationsSetSize = 9; // log2(512)
43 static const unsigned InitValuesSetSize = 9; // log2(512)
47 //===----------------------------------------------------------------------===//
48 /// CompileUnit - This dwarf writer support class manages information associate
49 /// with a source file.
50 class VISIBILITY_HIDDEN CompileUnit {
51 /// ID - File identifier for source.
55 /// Die - Compile unit debug information entry.
59 /// GVToDieMap - Tracks the mapping of unit level debug informaton
60 /// variables to debug information entries.
61 /// FIXME : Rename GVToDieMap -> NodeToDieMap
62 std::map<MDNode *, DIE *> GVToDieMap;
64 /// GVToDIEEntryMap - Tracks the mapping of unit level debug informaton
65 /// descriptors to debug information entries using a DIEEntry proxy.
67 std::map<MDNode *, DIEEntry *> GVToDIEEntryMap;
69 /// Globals - A map of globally visible named entities for this unit.
71 StringMap<DIE*> Globals;
73 /// DiesSet - Used to uniquely define dies within the compile unit.
75 FoldingSet<DIE> DiesSet;
77 CompileUnit(unsigned I, DIE *D)
78 : ID(I), Die(D), DiesSet(InitDiesSetSize) {}
79 ~CompileUnit() { delete Die; }
82 unsigned getID() const { return ID; }
83 DIE* getDie() const { return Die; }
84 StringMap<DIE*> &getGlobals() { return Globals; }
86 /// hasContent - Return true if this compile unit has something to write out.
88 bool hasContent() const { return !Die->getChildren().empty(); }
90 /// AddGlobal - Add a new global entity to the compile unit.
92 void AddGlobal(const std::string &Name, DIE *Die) { Globals[Name] = Die; }
94 /// getDieMapSlotFor - Returns the debug information entry map slot for the
95 /// specified debug variable.
96 DIE *&getDieMapSlotFor(MDNode *N) { return GVToDieMap[N]; }
98 /// getDIEEntrySlotFor - Returns the debug information entry proxy slot for
99 /// the specified debug variable.
100 DIEEntry *&getDIEEntrySlotFor(MDNode *N) {
101 return GVToDIEEntryMap[N];
104 /// AddDie - Adds or interns the DIE to the compile unit.
106 DIE *AddDie(DIE &Buffer) {
110 DIE *Die = DiesSet.FindNodeOrInsertPos(ID, Where);
113 Die = new DIE(Buffer);
114 DiesSet.InsertNode(Die, Where);
115 this->Die->AddChild(Die);
123 //===----------------------------------------------------------------------===//
124 /// DbgVariable - This class is used to track local variable information.
126 class VISIBILITY_HIDDEN DbgVariable {
127 DIVariable Var; // Variable Descriptor.
128 unsigned FrameIndex; // Variable frame index.
129 bool InlinedFnVar; // Variable for an inlined function.
131 DbgVariable(DIVariable V, unsigned I, bool IFV)
132 : Var(V), FrameIndex(I), InlinedFnVar(IFV) {}
135 DIVariable getVariable() const { return Var; }
136 unsigned getFrameIndex() const { return FrameIndex; }
137 bool isInlinedFnVar() const { return InlinedFnVar; }
140 //===----------------------------------------------------------------------===//
141 /// DbgScope - This class is used to track scope information.
143 class DbgConcreteScope;
144 class VISIBILITY_HIDDEN DbgScope {
145 DbgScope *Parent; // Parent to this scope.
146 DIDescriptor Desc; // Debug info descriptor for scope.
147 // Either subprogram or block.
148 unsigned StartLabelID; // Label ID of the beginning of scope.
149 unsigned EndLabelID; // Label ID of the end of scope.
150 const MachineInstr *LastInsn; // Last instruction of this scope.
151 const MachineInstr *FirstInsn; // First instruction of this scope.
152 SmallVector<DbgScope *, 4> Scopes; // Scopes defined in scope.
153 SmallVector<DbgVariable *, 8> Variables;// Variables declared in scope.
154 SmallVector<DbgConcreteScope *, 8> ConcreteInsts;// Concrete insts of funcs.
156 // Private state for dump()
157 mutable unsigned IndentLevel;
159 DbgScope(DbgScope *P, DIDescriptor D)
160 : Parent(P), Desc(D), StartLabelID(0), EndLabelID(0), LastInsn(0),
161 FirstInsn(0), IndentLevel(0) {}
165 DbgScope *getParent() const { return Parent; }
166 DIDescriptor getDesc() const { return Desc; }
167 unsigned getStartLabelID() const { return StartLabelID; }
168 unsigned getEndLabelID() const { return EndLabelID; }
169 SmallVector<DbgScope *, 4> &getScopes() { return Scopes; }
170 SmallVector<DbgVariable *, 8> &getVariables() { return Variables; }
171 SmallVector<DbgConcreteScope*,8> &getConcreteInsts() { return ConcreteInsts; }
172 void setStartLabelID(unsigned S) { StartLabelID = S; }
173 void setEndLabelID(unsigned E) { EndLabelID = E; }
174 void setLastInsn(const MachineInstr *MI) { LastInsn = MI; }
175 const MachineInstr *getLastInsn() { return LastInsn; }
176 void setFirstInsn(const MachineInstr *MI) { FirstInsn = MI; }
177 const MachineInstr *getFirstInsn() { return FirstInsn; }
178 /// AddScope - Add a scope to the scope.
180 void AddScope(DbgScope *S) { Scopes.push_back(S); }
182 /// AddVariable - Add a variable to the scope.
184 void AddVariable(DbgVariable *V) { Variables.push_back(V); }
186 /// AddConcreteInst - Add a concrete instance to the scope.
188 void AddConcreteInst(DbgConcreteScope *C) { ConcreteInsts.push_back(C); }
190 void FixInstructionMarkers() {
191 assert (getFirstInsn() && "First instruction is missing!");
195 // If a scope does not have an instruction to mark an end then use
196 // the end of last child scope.
197 SmallVector<DbgScope *, 4> &Scopes = getScopes();
198 assert (!Scopes.empty() && "Inner most scope does not have last insn!");
199 DbgScope *L = Scopes.back();
200 if (!L->getLastInsn())
201 L->FixInstructionMarkers();
202 setLastInsn(L->getLastInsn());
211 void DbgScope::dump() const {
212 raw_ostream &err = errs();
213 err.indent(IndentLevel);
215 err << " [" << StartLabelID << ", " << EndLabelID << "]\n";
219 for (unsigned i = 0, e = Scopes.size(); i != e; ++i)
220 if (Scopes[i] != this)
227 //===----------------------------------------------------------------------===//
228 /// DbgConcreteScope - This class is used to track a scope that holds concrete
229 /// instance information.
231 class VISIBILITY_HIDDEN DbgConcreteScope : public DbgScope {
233 DIE *Die; // Debug info for this concrete scope.
235 DbgConcreteScope(DIDescriptor D) : DbgScope(NULL, D) {}
238 DIE *getDie() const { return Die; }
239 void setDie(DIE *D) { Die = D; }
242 DbgScope::~DbgScope() {
243 for (unsigned i = 0, N = Scopes.size(); i < N; ++i)
245 for (unsigned j = 0, M = Variables.size(); j < M; ++j)
247 for (unsigned k = 0, O = ConcreteInsts.size(); k < O; ++k)
248 delete ConcreteInsts[k];
251 } // end llvm namespace
253 DwarfDebug::DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T)
254 : Dwarf(OS, A, T, "dbg"), ModuleCU(0),
255 AbbreviationsSet(InitAbbreviationsSetSize), Abbreviations(),
256 ValuesSet(InitValuesSetSize), Values(), StringPool(),
257 SectionSourceLines(), didInitial(false), shouldEmit(false),
258 FunctionDbgScope(0), DebugTimer(0) {
259 if (TimePassesIsEnabled)
260 DebugTimer = new Timer("Dwarf Debug Writer",
261 getDwarfTimerGroup());
263 DwarfDebug::~DwarfDebug() {
264 for (unsigned j = 0, M = Values.size(); j < M; ++j)
267 for (DenseMap<const MDNode *, DbgScope *>::iterator
268 I = AbstractInstanceRootMap.begin(),
269 E = AbstractInstanceRootMap.end(); I != E;++I)
275 /// AssignAbbrevNumber - Define a unique number for the abbreviation.
277 void DwarfDebug::AssignAbbrevNumber(DIEAbbrev &Abbrev) {
278 // Profile the node so that we can make it unique.
282 // Check the set for priors.
283 DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
285 // If it's newly added.
286 if (InSet == &Abbrev) {
287 // Add to abbreviation list.
288 Abbreviations.push_back(&Abbrev);
290 // Assign the vector position + 1 as its number.
291 Abbrev.setNumber(Abbreviations.size());
293 // Assign existing abbreviation number.
294 Abbrev.setNumber(InSet->getNumber());
298 /// CreateDIEEntry - Creates a new DIEEntry to be a proxy for a debug
299 /// information entry.
300 DIEEntry *DwarfDebug::CreateDIEEntry(DIE *Entry) {
305 DIEEntry::Profile(ID, Entry);
307 Value = static_cast<DIEEntry *>(ValuesSet.FindNodeOrInsertPos(ID, Where));
309 if (Value) return Value;
311 Value = new DIEEntry(Entry);
312 ValuesSet.InsertNode(Value, Where);
314 Value = new DIEEntry(Entry);
317 Values.push_back(Value);
321 /// SetDIEEntry - Set a DIEEntry once the debug information entry is defined.
323 void DwarfDebug::SetDIEEntry(DIEEntry *Value, DIE *Entry) {
324 Value->setEntry(Entry);
326 // Add to values set if not already there. If it is, we merely have a
327 // duplicate in the values list (no harm.)
328 ValuesSet.GetOrInsertNode(Value);
331 /// AddUInt - Add an unsigned integer attribute data and value.
333 void DwarfDebug::AddUInt(DIE *Die, unsigned Attribute,
334 unsigned Form, uint64_t Integer) {
335 if (!Form) Form = DIEInteger::BestForm(false, Integer);
338 DIEInteger::Profile(ID, Integer);
340 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
343 Value = new DIEInteger(Integer);
344 ValuesSet.InsertNode(Value, Where);
345 Values.push_back(Value);
348 Die->AddValue(Attribute, Form, Value);
351 /// AddSInt - Add an signed integer attribute data and value.
353 void DwarfDebug::AddSInt(DIE *Die, unsigned Attribute,
354 unsigned Form, int64_t Integer) {
355 if (!Form) Form = DIEInteger::BestForm(true, Integer);
358 DIEInteger::Profile(ID, (uint64_t)Integer);
360 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
363 Value = new DIEInteger(Integer);
364 ValuesSet.InsertNode(Value, Where);
365 Values.push_back(Value);
368 Die->AddValue(Attribute, Form, Value);
371 /// AddString - Add a string attribute data and value.
373 void DwarfDebug::AddString(DIE *Die, unsigned Attribute, unsigned Form,
374 const std::string &String) {
376 DIEString::Profile(ID, String);
378 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
381 Value = new DIEString(String);
382 ValuesSet.InsertNode(Value, Where);
383 Values.push_back(Value);
386 Die->AddValue(Attribute, Form, Value);
389 /// AddLabel - Add a Dwarf label attribute data and value.
391 void DwarfDebug::AddLabel(DIE *Die, unsigned Attribute, unsigned Form,
392 const DWLabel &Label) {
394 DIEDwarfLabel::Profile(ID, Label);
396 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
399 Value = new DIEDwarfLabel(Label);
400 ValuesSet.InsertNode(Value, Where);
401 Values.push_back(Value);
404 Die->AddValue(Attribute, Form, Value);
407 /// AddObjectLabel - Add an non-Dwarf label attribute data and value.
409 void DwarfDebug::AddObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
410 const std::string &Label) {
412 DIEObjectLabel::Profile(ID, Label);
414 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
417 Value = new DIEObjectLabel(Label);
418 ValuesSet.InsertNode(Value, Where);
419 Values.push_back(Value);
422 Die->AddValue(Attribute, Form, Value);
425 /// AddSectionOffset - Add a section offset label attribute data and value.
427 void DwarfDebug::AddSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
428 const DWLabel &Label, const DWLabel &Section,
429 bool isEH, bool useSet) {
431 DIESectionOffset::Profile(ID, Label, Section);
433 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
436 Value = new DIESectionOffset(Label, Section, isEH, useSet);
437 ValuesSet.InsertNode(Value, Where);
438 Values.push_back(Value);
441 Die->AddValue(Attribute, Form, Value);
444 /// AddDelta - Add a label delta attribute data and value.
446 void DwarfDebug::AddDelta(DIE *Die, unsigned Attribute, unsigned Form,
447 const DWLabel &Hi, const DWLabel &Lo) {
449 DIEDelta::Profile(ID, Hi, Lo);
451 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
454 Value = new DIEDelta(Hi, Lo);
455 ValuesSet.InsertNode(Value, Where);
456 Values.push_back(Value);
459 Die->AddValue(Attribute, Form, Value);
462 /// AddBlock - Add block data.
464 void DwarfDebug::AddBlock(DIE *Die, unsigned Attribute, unsigned Form,
466 Block->ComputeSize(TD);
470 DIEValue *Value = ValuesSet.FindNodeOrInsertPos(ID, Where);
474 ValuesSet.InsertNode(Value, Where);
475 Values.push_back(Value);
477 // Already exists, reuse the previous one.
479 Block = cast<DIEBlock>(Value);
482 Die->AddValue(Attribute, Block->BestForm(), Value);
485 /// AddSourceLine - Add location information to specified debug information
487 void DwarfDebug::AddSourceLine(DIE *Die, const DIVariable *V) {
488 // If there is no compile unit specified, don't add a line #.
489 if (V->getCompileUnit().isNull())
492 unsigned Line = V->getLineNumber();
493 unsigned FileID = FindCompileUnit(V->getCompileUnit()).getID();
494 assert(FileID && "Invalid file id");
495 AddUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
496 AddUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
499 /// AddSourceLine - Add location information to specified debug information
501 void DwarfDebug::AddSourceLine(DIE *Die, const DIGlobal *G) {
502 // If there is no compile unit specified, don't add a line #.
503 if (G->getCompileUnit().isNull())
506 unsigned Line = G->getLineNumber();
507 unsigned FileID = FindCompileUnit(G->getCompileUnit()).getID();
508 assert(FileID && "Invalid file id");
509 AddUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
510 AddUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
513 /// AddSourceLine - Add location information to specified debug information
515 void DwarfDebug::AddSourceLine(DIE *Die, const DISubprogram *SP) {
516 // If there is no compile unit specified, don't add a line #.
517 if (SP->getCompileUnit().isNull())
519 // If the line number is 0, don't add it.
520 if (SP->getLineNumber() == 0)
524 unsigned Line = SP->getLineNumber();
525 unsigned FileID = FindCompileUnit(SP->getCompileUnit()).getID();
526 assert(FileID && "Invalid file id");
527 AddUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
528 AddUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
531 /// AddSourceLine - Add location information to specified debug information
533 void DwarfDebug::AddSourceLine(DIE *Die, const DIType *Ty) {
534 // If there is no compile unit specified, don't add a line #.
535 DICompileUnit CU = Ty->getCompileUnit();
539 unsigned Line = Ty->getLineNumber();
540 unsigned FileID = FindCompileUnit(CU).getID();
541 assert(FileID && "Invalid file id");
542 AddUInt(Die, dwarf::DW_AT_decl_file, 0, FileID);
543 AddUInt(Die, dwarf::DW_AT_decl_line, 0, Line);
546 /* Byref variables, in Blocks, are declared by the programmer as
547 "SomeType VarName;", but the compiler creates a
548 __Block_byref_x_VarName struct, and gives the variable VarName
549 either the struct, or a pointer to the struct, as its type. This
550 is necessary for various behind-the-scenes things the compiler
551 needs to do with by-reference variables in blocks.
553 However, as far as the original *programmer* is concerned, the
554 variable should still have type 'SomeType', as originally declared.
556 The following function dives into the __Block_byref_x_VarName
557 struct to find the original type of the variable. This will be
558 passed back to the code generating the type for the Debug
559 Information Entry for the variable 'VarName'. 'VarName' will then
560 have the original type 'SomeType' in its debug information.
562 The original type 'SomeType' will be the type of the field named
563 'VarName' inside the __Block_byref_x_VarName struct.
565 NOTE: In order for this to not completely fail on the debugger
566 side, the Debug Information Entry for the variable VarName needs to
567 have a DW_AT_location that tells the debugger how to unwind through
568 the pointers and __Block_byref_x_VarName struct to find the actual
569 value of the variable. The function AddBlockByrefType does this. */
571 /// Find the type the programmer originally declared the variable to be
572 /// and return that type.
574 DIType DwarfDebug::GetBlockByrefType(DIType Ty, std::string Name) {
577 unsigned tag = Ty.getTag();
579 if (tag == dwarf::DW_TAG_pointer_type) {
580 DIDerivedType DTy = DIDerivedType(Ty.getNode());
581 subType = DTy.getTypeDerivedFrom();
584 DICompositeType blockStruct = DICompositeType(subType.getNode());
586 DIArray Elements = blockStruct.getTypeArray();
588 if (Elements.isNull())
591 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
592 DIDescriptor Element = Elements.getElement(i);
593 DIDerivedType DT = DIDerivedType(Element.getNode());
594 if (strcmp(Name.c_str(), DT.getName()) == 0)
595 return (DT.getTypeDerivedFrom());
601 /// AddComplexAddress - Start with the address based on the location provided,
602 /// and generate the DWARF information necessary to find the actual variable
603 /// given the extra address information encoded in the DIVariable, starting from
604 /// the starting location. Add the DWARF information to the die.
606 void DwarfDebug::AddComplexAddress(DbgVariable *&DV, DIE *Die,
608 const MachineLocation &Location) {
609 const DIVariable &VD = DV->getVariable();
610 DIType Ty = VD.getType();
612 // Decode the original location, and use that as the start of the byref
613 // variable's location.
614 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
615 DIEBlock *Block = new DIEBlock();
617 if (Location.isReg()) {
619 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
621 Reg = Reg - dwarf::DW_OP_reg0;
622 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
623 AddUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
627 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
629 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
630 AddUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
633 AddUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
636 for (unsigned i = 0, N = VD.getNumAddrElements(); i < N; ++i) {
637 uint64_t Element = VD.getAddrElement(i);
639 if (Element == DIFactory::OpPlus) {
640 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
641 AddUInt(Block, 0, dwarf::DW_FORM_udata, VD.getAddrElement(++i));
642 } else if (Element == DIFactory::OpDeref) {
643 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
644 } else llvm_unreachable("unknown DIFactory Opcode");
647 // Now attach the location information to the DIE.
648 AddBlock(Die, Attribute, 0, Block);
651 /* Byref variables, in Blocks, are declared by the programmer as "SomeType
652 VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
653 gives the variable VarName either the struct, or a pointer to the struct, as
654 its type. This is necessary for various behind-the-scenes things the
655 compiler needs to do with by-reference variables in Blocks.
657 However, as far as the original *programmer* is concerned, the variable
658 should still have type 'SomeType', as originally declared.
660 The function GetBlockByrefType dives into the __Block_byref_x_VarName
661 struct to find the original type of the variable, which is then assigned to
662 the variable's Debug Information Entry as its real type. So far, so good.
663 However now the debugger will expect the variable VarName to have the type
664 SomeType. So we need the location attribute for the variable to be an
665 expression that explains to the debugger how to navigate through the
666 pointers and struct to find the actual variable of type SomeType.
668 The following function does just that. We start by getting
669 the "normal" location for the variable. This will be the location
670 of either the struct __Block_byref_x_VarName or the pointer to the
671 struct __Block_byref_x_VarName.
673 The struct will look something like:
675 struct __Block_byref_x_VarName {
677 struct __Block_byref_x_VarName *forwarding;
678 ... <various other fields>
680 ... <maybe more fields>
683 If we are given the struct directly (as our starting point) we
684 need to tell the debugger to:
686 1). Add the offset of the forwarding field.
688 2). Follow that pointer to get the the real __Block_byref_x_VarName
689 struct to use (the real one may have been copied onto the heap).
691 3). Add the offset for the field VarName, to find the actual variable.
693 If we started with a pointer to the struct, then we need to
694 dereference that pointer first, before the other steps.
695 Translating this into DWARF ops, we will need to append the following
696 to the current location description for the variable:
698 DW_OP_deref -- optional, if we start with a pointer
699 DW_OP_plus_uconst <forward_fld_offset>
701 DW_OP_plus_uconst <varName_fld_offset>
703 That is what this function does. */
705 /// AddBlockByrefAddress - Start with the address based on the location
706 /// provided, and generate the DWARF information necessary to find the
707 /// actual Block variable (navigating the Block struct) based on the
708 /// starting location. Add the DWARF information to the die. For
709 /// more information, read large comment just above here.
711 void DwarfDebug::AddBlockByrefAddress(DbgVariable *&DV, DIE *Die,
713 const MachineLocation &Location) {
714 const DIVariable &VD = DV->getVariable();
715 DIType Ty = VD.getType();
717 unsigned Tag = Ty.getTag();
718 bool isPointer = false;
720 const char *varName = VD.getName();
722 if (Tag == dwarf::DW_TAG_pointer_type) {
723 DIDerivedType DTy = DIDerivedType(Ty.getNode());
724 TmpTy = DTy.getTypeDerivedFrom();
728 DICompositeType blockStruct = DICompositeType(TmpTy.getNode());
730 // Find the __forwarding field and the variable field in the __Block_byref
732 DIArray Fields = blockStruct.getTypeArray();
733 DIDescriptor varField = DIDescriptor();
734 DIDescriptor forwardingField = DIDescriptor();
737 for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
738 DIDescriptor Element = Fields.getElement(i);
739 DIDerivedType DT = DIDerivedType(Element.getNode());
740 const char *fieldName = DT.getName();
741 if (strcmp(fieldName, "__forwarding") == 0)
742 forwardingField = Element;
743 else if (strcmp(fieldName, varName) == 0)
747 assert(!varField.isNull() && "Can't find byref variable in Block struct");
748 assert(!forwardingField.isNull()
749 && "Can't find forwarding field in Block struct");
751 // Get the offsets for the forwarding field and the variable field.
752 unsigned int forwardingFieldOffset =
753 DIDerivedType(forwardingField.getNode()).getOffsetInBits() >> 3;
754 unsigned int varFieldOffset =
755 DIDerivedType(varField.getNode()).getOffsetInBits() >> 3;
757 // Decode the original location, and use that as the start of the byref
758 // variable's location.
759 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
760 DIEBlock *Block = new DIEBlock();
762 if (Location.isReg()) {
764 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
766 Reg = Reg - dwarf::DW_OP_reg0;
767 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
768 AddUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
772 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
774 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
775 AddUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
778 AddUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
781 // If we started with a pointer to the __Block_byref... struct, then
782 // the first thing we need to do is dereference the pointer (DW_OP_deref).
784 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
786 // Next add the offset for the '__forwarding' field:
787 // DW_OP_plus_uconst ForwardingFieldOffset. Note there's no point in
788 // adding the offset if it's 0.
789 if (forwardingFieldOffset > 0) {
790 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
791 AddUInt(Block, 0, dwarf::DW_FORM_udata, forwardingFieldOffset);
794 // Now dereference the __forwarding field to get to the real __Block_byref
795 // struct: DW_OP_deref.
796 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
798 // Now that we've got the real __Block_byref... struct, add the offset
799 // for the variable's field to get to the location of the actual variable:
800 // DW_OP_plus_uconst varFieldOffset. Again, don't add if it's 0.
801 if (varFieldOffset > 0) {
802 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
803 AddUInt(Block, 0, dwarf::DW_FORM_udata, varFieldOffset);
806 // Now attach the location information to the DIE.
807 AddBlock(Die, Attribute, 0, Block);
810 /// AddAddress - Add an address attribute to a die based on the location
812 void DwarfDebug::AddAddress(DIE *Die, unsigned Attribute,
813 const MachineLocation &Location) {
814 unsigned Reg = RI->getDwarfRegNum(Location.getReg(), false);
815 DIEBlock *Block = new DIEBlock();
817 if (Location.isReg()) {
819 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + Reg);
821 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
822 AddUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
826 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + Reg);
828 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
829 AddUInt(Block, 0, dwarf::DW_FORM_udata, Reg);
832 AddUInt(Block, 0, dwarf::DW_FORM_sdata, Location.getOffset());
835 AddBlock(Die, Attribute, 0, Block);
838 /// AddType - Add a new type attribute to the specified entity.
839 void DwarfDebug::AddType(CompileUnit *DW_Unit, DIE *Entity, DIType Ty) {
843 // Check for pre-existence.
844 DIEEntry *&Slot = DW_Unit->getDIEEntrySlotFor(Ty.getNode());
846 // If it exists then use the existing value.
848 Entity->AddValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Slot);
853 Slot = CreateDIEEntry();
856 DIE Buffer(dwarf::DW_TAG_base_type);
857 if (Ty.isBasicType())
858 ConstructTypeDIE(DW_Unit, Buffer, DIBasicType(Ty.getNode()));
859 else if (Ty.isCompositeType())
860 ConstructTypeDIE(DW_Unit, Buffer, DICompositeType(Ty.getNode()));
862 assert(Ty.isDerivedType() && "Unknown kind of DIType");
863 ConstructTypeDIE(DW_Unit, Buffer, DIDerivedType(Ty.getNode()));
866 // Add debug information entry to entity and appropriate context.
868 DIDescriptor Context = Ty.getContext();
869 if (!Context.isNull())
870 Die = DW_Unit->getDieMapSlotFor(Context.getNode());
873 DIE *Child = new DIE(Buffer);
874 Die->AddChild(Child);
876 SetDIEEntry(Slot, Child);
878 Die = DW_Unit->AddDie(Buffer);
879 SetDIEEntry(Slot, Die);
882 Entity->AddValue(dwarf::DW_AT_type, dwarf::DW_FORM_ref4, Slot);
885 /// ConstructTypeDIE - Construct basic type die from DIBasicType.
886 void DwarfDebug::ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
888 // Get core information.
889 const char *Name = BTy.getName();
890 Buffer.setTag(dwarf::DW_TAG_base_type);
891 AddUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
894 // Add name if not anonymous or intermediate type.
896 AddString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
897 uint64_t Size = BTy.getSizeInBits() >> 3;
898 AddUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
901 /// ConstructTypeDIE - Construct derived type die from DIDerivedType.
902 void DwarfDebug::ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
904 // Get core information.
905 const char *Name = DTy.getName();
906 uint64_t Size = DTy.getSizeInBits() >> 3;
907 unsigned Tag = DTy.getTag();
909 // FIXME - Workaround for templates.
910 if (Tag == dwarf::DW_TAG_inheritance) Tag = dwarf::DW_TAG_reference_type;
914 // Map to main type, void will not have a type.
915 DIType FromTy = DTy.getTypeDerivedFrom();
916 AddType(DW_Unit, &Buffer, FromTy);
918 // Add name if not anonymous or intermediate type.
920 AddString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
922 // Add size if non-zero (derived types might be zero-sized.)
924 AddUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
926 // Add source line info if available and TyDesc is not a forward declaration.
927 if (!DTy.isForwardDecl())
928 AddSourceLine(&Buffer, &DTy);
931 /// ConstructTypeDIE - Construct type DIE from DICompositeType.
932 void DwarfDebug::ConstructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
933 DICompositeType CTy) {
934 // Get core information.
935 const char *Name = CTy.getName();
937 uint64_t Size = CTy.getSizeInBits() >> 3;
938 unsigned Tag = CTy.getTag();
942 case dwarf::DW_TAG_vector_type:
943 case dwarf::DW_TAG_array_type:
944 ConstructArrayTypeDIE(DW_Unit, Buffer, &CTy);
946 case dwarf::DW_TAG_enumeration_type: {
947 DIArray Elements = CTy.getTypeArray();
949 // Add enumerators to enumeration type.
950 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
952 DIEnumerator Enum(Elements.getElement(i).getNode());
953 ElemDie = ConstructEnumTypeDIE(DW_Unit, &Enum);
954 Buffer.AddChild(ElemDie);
958 case dwarf::DW_TAG_subroutine_type: {
960 DIArray Elements = CTy.getTypeArray();
961 DIDescriptor RTy = Elements.getElement(0);
962 AddType(DW_Unit, &Buffer, DIType(RTy.getNode()));
964 // Add prototype flag.
965 AddUInt(&Buffer, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
968 for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
969 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
970 DIDescriptor Ty = Elements.getElement(i);
971 AddType(DW_Unit, Arg, DIType(Ty.getNode()));
972 Buffer.AddChild(Arg);
976 case dwarf::DW_TAG_structure_type:
977 case dwarf::DW_TAG_union_type:
978 case dwarf::DW_TAG_class_type: {
979 // Add elements to structure type.
980 DIArray Elements = CTy.getTypeArray();
982 // A forward struct declared type may not have elements available.
983 if (Elements.isNull())
986 // Add elements to structure type.
987 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
988 DIDescriptor Element = Elements.getElement(i);
989 if (Element.isNull())
992 if (Element.getTag() == dwarf::DW_TAG_subprogram)
993 ElemDie = CreateSubprogramDIE(DW_Unit,
994 DISubprogram(Element.getNode()));
996 ElemDie = CreateMemberDIE(DW_Unit,
997 DIDerivedType(Element.getNode()));
998 Buffer.AddChild(ElemDie);
1001 if (CTy.isAppleBlockExtension())
1002 AddUInt(&Buffer, dwarf::DW_AT_APPLE_block, dwarf::DW_FORM_flag, 1);
1004 unsigned RLang = CTy.getRunTimeLang();
1006 AddUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class,
1007 dwarf::DW_FORM_data1, RLang);
1014 // Add name if not anonymous or intermediate type.
1016 AddString(&Buffer, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
1018 if (Tag == dwarf::DW_TAG_enumeration_type ||
1019 Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type) {
1020 // Add size if non-zero (derived types might be zero-sized.)
1022 AddUInt(&Buffer, dwarf::DW_AT_byte_size, 0, Size);
1024 // Add zero size if it is not a forward declaration.
1025 if (CTy.isForwardDecl())
1026 AddUInt(&Buffer, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
1028 AddUInt(&Buffer, dwarf::DW_AT_byte_size, 0, 0);
1031 // Add source line info if available.
1032 if (!CTy.isForwardDecl())
1033 AddSourceLine(&Buffer, &CTy);
1037 /// ConstructSubrangeDIE - Construct subrange DIE from DISubrange.
1038 void DwarfDebug::ConstructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy){
1039 int64_t L = SR.getLo();
1040 int64_t H = SR.getHi();
1041 DIE *DW_Subrange = new DIE(dwarf::DW_TAG_subrange_type);
1043 AddDIEEntry(DW_Subrange, dwarf::DW_AT_type, dwarf::DW_FORM_ref4, IndexTy);
1045 AddSInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, L);
1047 AddSInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H);
1049 Buffer.AddChild(DW_Subrange);
1052 /// ConstructArrayTypeDIE - Construct array type DIE from DICompositeType.
1053 void DwarfDebug::ConstructArrayTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
1054 DICompositeType *CTy) {
1055 Buffer.setTag(dwarf::DW_TAG_array_type);
1056 if (CTy->getTag() == dwarf::DW_TAG_vector_type)
1057 AddUInt(&Buffer, dwarf::DW_AT_GNU_vector, dwarf::DW_FORM_flag, 1);
1059 // Emit derived type.
1060 AddType(DW_Unit, &Buffer, CTy->getTypeDerivedFrom());
1061 DIArray Elements = CTy->getTypeArray();
1063 // Construct an anonymous type for index type.
1064 DIE IdxBuffer(dwarf::DW_TAG_base_type);
1065 AddUInt(&IdxBuffer, dwarf::DW_AT_byte_size, 0, sizeof(int32_t));
1066 AddUInt(&IdxBuffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
1067 dwarf::DW_ATE_signed);
1068 DIE *IndexTy = DW_Unit->AddDie(IdxBuffer);
1070 // Add subranges to array type.
1071 for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
1072 DIDescriptor Element = Elements.getElement(i);
1073 if (Element.getTag() == dwarf::DW_TAG_subrange_type)
1074 ConstructSubrangeDIE(Buffer, DISubrange(Element.getNode()), IndexTy);
1078 /// ConstructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
1079 DIE *DwarfDebug::ConstructEnumTypeDIE(CompileUnit *DW_Unit, DIEnumerator *ETy) {
1080 DIE *Enumerator = new DIE(dwarf::DW_TAG_enumerator);
1081 const char *Name = ETy->getName();
1082 AddString(Enumerator, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
1083 int64_t Value = ETy->getEnumValue();
1084 AddSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, Value);
1088 /// CreateGlobalVariableDIE - Create new DIE using GV.
1089 DIE *DwarfDebug::CreateGlobalVariableDIE(CompileUnit *DW_Unit,
1090 const DIGlobalVariable &GV) {
1091 DIE *GVDie = new DIE(dwarf::DW_TAG_variable);
1092 AddString(GVDie, dwarf::DW_AT_name, dwarf::DW_FORM_string,
1093 GV.getDisplayName());
1095 const char *LinkageName = GV.getLinkageName();
1097 // Skip special LLVM prefix that is used to inform the asm printer to not
1098 // emit usual symbol prefix before the symbol name. This happens for
1099 // Objective-C symbol names and symbol whose name is replaced using GCC's
1100 // __asm__ attribute.
1101 if (LinkageName[0] == 1)
1102 LinkageName = &LinkageName[1];
1103 AddString(GVDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string,
1106 AddType(DW_Unit, GVDie, GV.getType());
1107 if (!GV.isLocalToUnit())
1108 AddUInt(GVDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
1109 AddSourceLine(GVDie, &GV);
1112 DIEBlock *Block = new DIEBlock();
1113 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
1114 AddObjectLabel(Block, 0, dwarf::DW_FORM_udata,
1115 Asm->Mang->getMangledName(GV.getGlobal()));
1116 AddBlock(GVDie, dwarf::DW_AT_location, 0, Block);
1121 /// CreateMemberDIE - Create new member DIE.
1122 DIE *DwarfDebug::CreateMemberDIE(CompileUnit *DW_Unit, const DIDerivedType &DT){
1123 DIE *MemberDie = new DIE(DT.getTag());
1124 if (const char *Name = DT.getName())
1125 AddString(MemberDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
1127 AddType(DW_Unit, MemberDie, DT.getTypeDerivedFrom());
1129 AddSourceLine(MemberDie, &DT);
1131 uint64_t Size = DT.getSizeInBits();
1132 uint64_t FieldSize = DT.getOriginalTypeSize();
1134 if (Size != FieldSize) {
1136 AddUInt(MemberDie, dwarf::DW_AT_byte_size, 0, DT.getOriginalTypeSize()>>3);
1137 AddUInt(MemberDie, dwarf::DW_AT_bit_size, 0, DT.getSizeInBits());
1139 uint64_t Offset = DT.getOffsetInBits();
1140 uint64_t FieldOffset = Offset;
1141 uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
1142 uint64_t HiMark = (Offset + FieldSize) & AlignMask;
1143 FieldOffset = (HiMark - FieldSize);
1144 Offset -= FieldOffset;
1146 // Maybe we need to work from the other end.
1147 if (TD->isLittleEndian()) Offset = FieldSize - (Offset + Size);
1148 AddUInt(MemberDie, dwarf::DW_AT_bit_offset, 0, Offset);
1151 DIEBlock *Block = new DIEBlock();
1152 AddUInt(Block, 0, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
1153 AddUInt(Block, 0, dwarf::DW_FORM_udata, DT.getOffsetInBits() >> 3);
1154 AddBlock(MemberDie, dwarf::DW_AT_data_member_location, 0, Block);
1156 if (DT.isProtected())
1157 AddUInt(MemberDie, dwarf::DW_AT_accessibility, 0,
1158 dwarf::DW_ACCESS_protected);
1159 else if (DT.isPrivate())
1160 AddUInt(MemberDie, dwarf::DW_AT_accessibility, 0,
1161 dwarf::DW_ACCESS_private);
1166 /// CreateSubprogramDIE - Create new DIE using SP.
1167 DIE *DwarfDebug::CreateSubprogramDIE(CompileUnit *DW_Unit,
1168 const DISubprogram &SP,
1171 DIE *SPDie = new DIE(dwarf::DW_TAG_subprogram);
1173 const char * Name = SP.getName();
1174 AddString(SPDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
1176 const char *LinkageName = SP.getLinkageName();
1178 // Skip special LLVM prefix that is used to inform the asm printer to not emit
1179 // usual symbol prefix before the symbol name. This happens for Objective-C
1180 // symbol names and symbol whose name is replaced using GCC's __asm__ attribute.
1181 if (LinkageName[0] == 1)
1182 LinkageName = &LinkageName[1];
1183 AddString(SPDie, dwarf::DW_AT_MIPS_linkage_name, dwarf::DW_FORM_string,
1186 AddSourceLine(SPDie, &SP);
1188 DICompositeType SPTy = SP.getType();
1189 DIArray Args = SPTy.getTypeArray();
1191 // Add prototyped tag, if C or ObjC.
1192 unsigned Lang = SP.getCompileUnit().getLanguage();
1193 if (Lang == dwarf::DW_LANG_C99 || Lang == dwarf::DW_LANG_C89 ||
1194 Lang == dwarf::DW_LANG_ObjC)
1195 AddUInt(SPDie, dwarf::DW_AT_prototyped, dwarf::DW_FORM_flag, 1);
1198 unsigned SPTag = SPTy.getTag();
1199 if (!IsConstructor) {
1200 if (Args.isNull() || SPTag != dwarf::DW_TAG_subroutine_type)
1201 AddType(DW_Unit, SPDie, SPTy);
1203 AddType(DW_Unit, SPDie, DIType(Args.getElement(0).getNode()));
1206 if (!SP.isDefinition()) {
1207 AddUInt(SPDie, dwarf::DW_AT_declaration, dwarf::DW_FORM_flag, 1);
1209 // Add arguments. Do not add arguments for subprogram definition. They will
1210 // be handled through RecordVariable.
1211 if (SPTag == dwarf::DW_TAG_subroutine_type)
1212 for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
1213 DIE *Arg = new DIE(dwarf::DW_TAG_formal_parameter);
1214 AddType(DW_Unit, Arg, DIType(Args.getElement(i).getNode()));
1215 AddUInt(Arg, dwarf::DW_AT_artificial, dwarf::DW_FORM_flag, 1); // ??
1216 SPDie->AddChild(Arg);
1220 if (!SP.isLocalToUnit() && !IsInlined)
1221 AddUInt(SPDie, dwarf::DW_AT_external, dwarf::DW_FORM_flag, 1);
1223 // DW_TAG_inlined_subroutine may refer to this DIE.
1224 DIE *&Slot = DW_Unit->getDieMapSlotFor(SP.getNode());
1229 /// FindCompileUnit - Get the compile unit for the given descriptor.
1231 CompileUnit &DwarfDebug::FindCompileUnit(DICompileUnit Unit) const {
1232 DenseMap<Value *, CompileUnit *>::const_iterator I =
1233 CompileUnitMap.find(Unit.getNode());
1234 assert(I != CompileUnitMap.end() && "Missing compile unit.");
1238 /// CreateDbgScopeVariable - Create a new scope variable.
1240 DIE *DwarfDebug::CreateDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit) {
1241 // Get the descriptor.
1242 const DIVariable &VD = DV->getVariable();
1244 // Translate tag to proper Dwarf tag. The result variable is dropped for
1247 switch (VD.getTag()) {
1248 case dwarf::DW_TAG_return_variable:
1250 case dwarf::DW_TAG_arg_variable:
1251 Tag = dwarf::DW_TAG_formal_parameter;
1253 case dwarf::DW_TAG_auto_variable: // fall thru
1255 Tag = dwarf::DW_TAG_variable;
1259 // Define variable debug information entry.
1260 DIE *VariableDie = new DIE(Tag);
1261 const char *Name = VD.getName();
1262 AddString(VariableDie, dwarf::DW_AT_name, dwarf::DW_FORM_string, Name);
1264 // Add source line info if available.
1265 AddSourceLine(VariableDie, &VD);
1267 // Add variable type.
1268 // FIXME: isBlockByrefVariable should be reformulated in terms of complex addresses instead.
1269 if (VD.isBlockByrefVariable())
1270 AddType(Unit, VariableDie, GetBlockByrefType(VD.getType(), Name));
1272 AddType(Unit, VariableDie, VD.getType());
1274 // Add variable address.
1275 if (!DV->isInlinedFnVar()) {
1276 // Variables for abstract instances of inlined functions don't get a
1278 MachineLocation Location;
1279 Location.set(RI->getFrameRegister(*MF),
1280 RI->getFrameIndexOffset(*MF, DV->getFrameIndex()));
1283 if (VD.hasComplexAddress())
1284 AddComplexAddress(DV, VariableDie, dwarf::DW_AT_location, Location);
1285 else if (VD.isBlockByrefVariable())
1286 AddBlockByrefAddress(DV, VariableDie, dwarf::DW_AT_location, Location);
1288 AddAddress(VariableDie, dwarf::DW_AT_location, Location);
1294 /// getOrCreateScope - Returns the scope associated with the given descriptor.
1296 DbgScope *DwarfDebug::getDbgScope(MDNode *N, const MachineInstr *MI) {
1297 DbgScope *&Slot = DbgScopeMap[N];
1298 if (Slot) return Slot;
1300 DbgScope *Parent = NULL;
1302 DIDescriptor Scope(N);
1303 if (Scope.isCompileUnit()) {
1305 } else if (Scope.isSubprogram()) {
1307 DIDescriptor ParentDesc = SP.getContext();
1308 if (!ParentDesc.isNull() && !ParentDesc.isCompileUnit())
1309 Parent = getDbgScope(ParentDesc.getNode(), MI);
1310 } else if (Scope.isLexicalBlock()) {
1311 DILexicalBlock DB(N);
1312 DIDescriptor ParentDesc = DB.getContext();
1313 if (!ParentDesc.isNull())
1314 Parent = getDbgScope(ParentDesc.getNode(), MI);
1316 assert (0 && "Unexpected scope info");
1318 Slot = new DbgScope(Parent, DIDescriptor(N));
1319 Slot->setFirstInsn(MI);
1322 Parent->AddScope(Slot);
1324 // First function is top level function.
1325 if (!FunctionDbgScope)
1326 FunctionDbgScope = Slot;
1332 /// getOrCreateScope - Returns the scope associated with the given descriptor.
1333 /// FIXME - Remove this method.
1334 DbgScope *DwarfDebug::getOrCreateScope(MDNode *N) {
1335 DbgScope *&Slot = DbgScopeMap[N];
1336 if (Slot) return Slot;
1338 DbgScope *Parent = NULL;
1339 DILexicalBlock Block(N);
1341 // Don't create a new scope if we already created one for an inlined function.
1342 DenseMap<const MDNode *, DbgScope *>::iterator
1343 II = AbstractInstanceRootMap.find(N);
1344 if (II != AbstractInstanceRootMap.end())
1345 return LexicalScopeStack.back();
1347 if (!Block.isNull()) {
1348 DIDescriptor ParentDesc = Block.getContext();
1350 ParentDesc.isNull() ? NULL : getOrCreateScope(ParentDesc.getNode());
1353 Slot = new DbgScope(Parent, DIDescriptor(N));
1356 Parent->AddScope(Slot);
1358 // First function is top level function.
1359 FunctionDbgScope = Slot;
1364 /// ConstructDbgScope - Construct the components of a scope.
1366 void DwarfDebug::ConstructDbgScope(DbgScope *ParentScope,
1367 unsigned ParentStartID,
1368 unsigned ParentEndID,
1369 DIE *ParentDie, CompileUnit *Unit) {
1370 // Add variables to scope.
1371 SmallVector<DbgVariable *, 8> &Variables = ParentScope->getVariables();
1372 for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
1373 DIE *VariableDie = CreateDbgScopeVariable(Variables[i], Unit);
1374 if (VariableDie) ParentDie->AddChild(VariableDie);
1377 // Add concrete instances to scope.
1378 SmallVector<DbgConcreteScope *, 8> &ConcreteInsts =
1379 ParentScope->getConcreteInsts();
1380 for (unsigned i = 0, N = ConcreteInsts.size(); i < N; ++i) {
1381 DbgConcreteScope *ConcreteInst = ConcreteInsts[i];
1382 DIE *Die = ConcreteInst->getDie();
1384 unsigned StartID = ConcreteInst->getStartLabelID();
1385 unsigned EndID = ConcreteInst->getEndLabelID();
1387 // Add the scope bounds.
1389 AddLabel(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
1390 DWLabel("label", StartID));
1392 AddLabel(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
1393 DWLabel("func_begin", SubprogramCount));
1396 AddLabel(Die, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
1397 DWLabel("label", EndID));
1399 AddLabel(Die, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
1400 DWLabel("func_end", SubprogramCount));
1402 ParentDie->AddChild(Die);
1405 // Add nested scopes.
1406 SmallVector<DbgScope *, 4> &Scopes = ParentScope->getScopes();
1407 for (unsigned j = 0, M = Scopes.size(); j < M; ++j) {
1408 // Define the Scope debug information entry.
1409 DbgScope *Scope = Scopes[j];
1411 unsigned StartID = MMI->MappedLabel(Scope->getStartLabelID());
1412 unsigned EndID = MMI->MappedLabel(Scope->getEndLabelID());
1414 // Ignore empty scopes.
1415 if (StartID == EndID && StartID != 0) continue;
1417 // Do not ignore inlined scopes even if they don't have any variables or
1419 if (Scope->getScopes().empty() && Scope->getVariables().empty() &&
1420 Scope->getConcreteInsts().empty())
1423 if (StartID == ParentStartID && EndID == ParentEndID) {
1424 // Just add stuff to the parent scope.
1425 ConstructDbgScope(Scope, ParentStartID, ParentEndID, ParentDie, Unit);
1427 DIE *ScopeDie = new DIE(dwarf::DW_TAG_lexical_block);
1429 // Add the scope bounds.
1431 AddLabel(ScopeDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
1432 DWLabel("label", StartID));
1434 AddLabel(ScopeDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
1435 DWLabel("func_begin", SubprogramCount));
1438 AddLabel(ScopeDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
1439 DWLabel("label", EndID));
1441 AddLabel(ScopeDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
1442 DWLabel("func_end", SubprogramCount));
1444 // Add the scope's contents.
1445 ConstructDbgScope(Scope, StartID, EndID, ScopeDie, Unit);
1446 ParentDie->AddChild(ScopeDie);
1451 /// ConstructFunctionDbgScope - Construct the scope for the subprogram.
1453 void DwarfDebug::ConstructFunctionDbgScope(DbgScope *RootScope,
1454 bool AbstractScope) {
1455 // Exit if there is no root scope.
1456 if (!RootScope) return;
1457 DIDescriptor Desc = RootScope->getDesc();
1461 // Get the subprogram debug information entry.
1462 DISubprogram SPD(Desc.getNode());
1464 // Get the subprogram die.
1465 DIE *SPDie = ModuleCU->getDieMapSlotFor(SPD.getNode());
1467 ConstructSubprogram(SPD.getNode());
1468 SPDie = ModuleCU->getDieMapSlotFor(SPD.getNode());
1470 assert(SPDie && "Missing subprogram descriptor");
1472 if (!AbstractScope) {
1473 // Add the function bounds.
1474 AddLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
1475 DWLabel("func_begin", SubprogramCount));
1476 AddLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
1477 DWLabel("func_end", SubprogramCount));
1478 MachineLocation Location(RI->getFrameRegister(*MF));
1479 AddAddress(SPDie, dwarf::DW_AT_frame_base, Location);
1482 ConstructDbgScope(RootScope, 0, 0, SPDie, ModuleCU);
1483 // If there are global variables at this scope then add their dies.
1484 for (SmallVector<WeakVH, 4>::iterator SGI = ScopedGVs.begin(),
1485 SGE = ScopedGVs.end(); SGI != SGE; ++SGI) {
1486 MDNode *N = dyn_cast_or_null<MDNode>(*SGI);
1488 DIGlobalVariable GV(N);
1489 if (GV.getContext().getNode() == RootScope->getDesc().getNode()) {
1490 DIE *ScopedGVDie = CreateGlobalVariableDIE(ModuleCU, GV);
1491 SPDie->AddChild(ScopedGVDie);
1496 /// ConstructDefaultDbgScope - Construct a default scope for the subprogram.
1498 void DwarfDebug::ConstructDefaultDbgScope(MachineFunction *MF) {
1499 StringMap<DIE*> &Globals = ModuleCU->getGlobals();
1500 StringMap<DIE*>::iterator GI = Globals.find(MF->getFunction()->getName());
1501 if (GI != Globals.end()) {
1502 DIE *SPDie = GI->second;
1504 // Add the function bounds.
1505 AddLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
1506 DWLabel("func_begin", SubprogramCount));
1507 AddLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
1508 DWLabel("func_end", SubprogramCount));
1510 MachineLocation Location(RI->getFrameRegister(*MF));
1511 AddAddress(SPDie, dwarf::DW_AT_frame_base, Location);
1515 /// GetOrCreateSourceID - Look up the source id with the given directory and
1516 /// source file names. If none currently exists, create a new id and insert it
1517 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames
1519 unsigned DwarfDebug::GetOrCreateSourceID(const char *DirName,
1520 const char *FileName) {
1522 StringMap<unsigned>::iterator DI = DirectoryIdMap.find(DirName);
1523 if (DI != DirectoryIdMap.end()) {
1524 DId = DI->getValue();
1526 DId = DirectoryNames.size() + 1;
1527 DirectoryIdMap[DirName] = DId;
1528 DirectoryNames.push_back(DirName);
1532 StringMap<unsigned>::iterator FI = SourceFileIdMap.find(FileName);
1533 if (FI != SourceFileIdMap.end()) {
1534 FId = FI->getValue();
1536 FId = SourceFileNames.size() + 1;
1537 SourceFileIdMap[FileName] = FId;
1538 SourceFileNames.push_back(FileName);
1541 DenseMap<std::pair<unsigned, unsigned>, unsigned>::iterator SI =
1542 SourceIdMap.find(std::make_pair(DId, FId));
1543 if (SI != SourceIdMap.end())
1546 unsigned SrcId = SourceIds.size() + 1; // DW_AT_decl_file cannot be 0.
1547 SourceIdMap[std::make_pair(DId, FId)] = SrcId;
1548 SourceIds.push_back(std::make_pair(DId, FId));
1553 void DwarfDebug::ConstructCompileUnit(MDNode *N) {
1554 DICompileUnit DIUnit(N);
1555 const char *FN = DIUnit.getFilename();
1556 const char *Dir = DIUnit.getDirectory();
1557 unsigned ID = GetOrCreateSourceID(Dir, FN);
1559 DIE *Die = new DIE(dwarf::DW_TAG_compile_unit);
1560 AddSectionOffset(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4,
1561 DWLabel("section_line", 0), DWLabel("section_line", 0),
1563 AddString(Die, dwarf::DW_AT_producer, dwarf::DW_FORM_string,
1564 DIUnit.getProducer());
1565 AddUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data1,
1566 DIUnit.getLanguage());
1567 AddString(Die, dwarf::DW_AT_name, dwarf::DW_FORM_string, FN);
1570 AddString(Die, dwarf::DW_AT_comp_dir, dwarf::DW_FORM_string, Dir);
1571 if (DIUnit.isOptimized())
1572 AddUInt(Die, dwarf::DW_AT_APPLE_optimized, dwarf::DW_FORM_flag, 1);
1574 if (const char *Flags = DIUnit.getFlags())
1575 AddString(Die, dwarf::DW_AT_APPLE_flags, dwarf::DW_FORM_string, Flags);
1577 unsigned RVer = DIUnit.getRunTimeVersion();
1579 AddUInt(Die, dwarf::DW_AT_APPLE_major_runtime_vers,
1580 dwarf::DW_FORM_data1, RVer);
1582 CompileUnit *Unit = new CompileUnit(ID, Die);
1583 if (!ModuleCU && DIUnit.isMain()) {
1584 // Use first compile unit marked as isMain as the compile unit
1589 CompileUnitMap[DIUnit.getNode()] = Unit;
1590 CompileUnits.push_back(Unit);
1593 void DwarfDebug::ConstructGlobalVariableDIE(MDNode *N) {
1594 DIGlobalVariable DI_GV(N);
1596 // If debug information is malformed then ignore it.
1597 if (DI_GV.Verify() == false)
1600 // Check for pre-existence.
1601 DIE *&Slot = ModuleCU->getDieMapSlotFor(DI_GV.getNode());
1605 DIE *VariableDie = CreateGlobalVariableDIE(ModuleCU, DI_GV);
1610 // Add to context owner.
1611 ModuleCU->getDie()->AddChild(VariableDie);
1613 // Expose as global. FIXME - need to check external flag.
1614 ModuleCU->AddGlobal(DI_GV.getName(), VariableDie);
1618 void DwarfDebug::ConstructSubprogram(MDNode *N) {
1621 // Check for pre-existence.
1622 DIE *&Slot = ModuleCU->getDieMapSlotFor(N);
1626 if (!SP.isDefinition())
1627 // This is a method declaration which will be handled while constructing
1631 DIE *SubprogramDie = CreateSubprogramDIE(ModuleCU, SP);
1634 Slot = SubprogramDie;
1636 // Add to context owner.
1637 ModuleCU->getDie()->AddChild(SubprogramDie);
1639 // Expose as global.
1640 ModuleCU->AddGlobal(SP.getName(), SubprogramDie);
1644 /// BeginModule - Emit all Dwarf sections that should come prior to the
1645 /// content. Create global DIEs and emit initial debug info sections.
1646 /// This is inovked by the target AsmPrinter.
1647 void DwarfDebug::BeginModule(Module *M, MachineModuleInfo *mmi) {
1650 if (TimePassesIsEnabled)
1651 DebugTimer->startTimer();
1653 DebugInfoFinder DbgFinder;
1654 DbgFinder.processModule(*M);
1656 // Create all the compile unit DIEs.
1657 for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
1658 E = DbgFinder.compile_unit_end(); I != E; ++I)
1659 ConstructCompileUnit(*I);
1661 if (CompileUnits.empty()) {
1662 if (TimePassesIsEnabled)
1663 DebugTimer->stopTimer();
1668 // If main compile unit for this module is not seen than randomly
1669 // select first compile unit.
1671 ModuleCU = CompileUnits[0];
1673 // Create DIEs for each of the externally visible global variables.
1674 for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
1675 E = DbgFinder.global_variable_end(); I != E; ++I) {
1676 DIGlobalVariable GV(*I);
1677 if (GV.getContext().getNode() != GV.getCompileUnit().getNode())
1678 ScopedGVs.push_back(*I);
1680 ConstructGlobalVariableDIE(*I);
1683 // Create DIEs for each of the externally visible subprograms.
1684 for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(),
1685 E = DbgFinder.subprogram_end(); I != E; ++I)
1686 ConstructSubprogram(*I);
1690 MMI->setDebugInfoAvailability(true);
1692 // Prime section data.
1693 SectionMap.insert(Asm->getObjFileLowering().getTextSection());
1695 // Print out .file directives to specify files for .loc directives. These are
1696 // printed out early so that they precede any .loc directives.
1697 if (MAI->hasDotLocAndDotFile()) {
1698 for (unsigned i = 1, e = getNumSourceIds()+1; i != e; ++i) {
1699 // Remember source id starts at 1.
1700 std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(i);
1701 sys::Path FullPath(getSourceDirectoryName(Id.first));
1703 FullPath.appendComponent(getSourceFileName(Id.second));
1704 assert(AppendOk && "Could not append filename to directory!");
1706 Asm->EmitFile(i, FullPath.str());
1711 // Emit initial sections
1714 if (TimePassesIsEnabled)
1715 DebugTimer->stopTimer();
1718 /// EndModule - Emit all Dwarf sections that should come after the content.
1720 void DwarfDebug::EndModule() {
1724 if (TimePassesIsEnabled)
1725 DebugTimer->startTimer();
1727 // Standard sections final addresses.
1728 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getTextSection());
1729 EmitLabel("text_end", 0);
1730 Asm->OutStreamer.SwitchSection(Asm->getObjFileLowering().getDataSection());
1731 EmitLabel("data_end", 0);
1733 // End text sections.
1734 for (unsigned i = 1, N = SectionMap.size(); i <= N; ++i) {
1735 Asm->OutStreamer.SwitchSection(SectionMap[i]);
1736 EmitLabel("section_end", i);
1739 // Emit common frame information.
1740 EmitCommonDebugFrame();
1742 // Emit function debug frame information
1743 for (std::vector<FunctionDebugFrameInfo>::iterator I = DebugFrames.begin(),
1744 E = DebugFrames.end(); I != E; ++I)
1745 EmitFunctionDebugFrame(*I);
1747 // Compute DIE offsets and sizes.
1750 // Emit all the DIEs into a debug info section
1753 // Corresponding abbreviations into a abbrev section.
1754 EmitAbbreviations();
1756 // Emit source line correspondence into a debug line section.
1759 // Emit info into a debug pubnames section.
1760 EmitDebugPubNames();
1762 // Emit info into a debug str section.
1765 // Emit info into a debug loc section.
1768 // Emit info into a debug aranges section.
1771 // Emit info into a debug ranges section.
1774 // Emit info into a debug macinfo section.
1777 // Emit inline info.
1778 EmitDebugInlineInfo();
1780 if (TimePassesIsEnabled)
1781 DebugTimer->stopTimer();
1784 /// CollectVariableInfo - Populate DbgScope entries with variables' info.
1785 void DwarfDebug::CollectVariableInfo() {
1787 MachineModuleInfo::VariableDbgInfoMapTy &VMap = MMI->getVariableDbgInfo();
1788 for (MachineModuleInfo::VariableDbgInfoMapTy::iterator VI = VMap.begin(),
1789 VE = VMap.end(); VI != VE; ++VI) {
1790 MDNode *Var = VI->first;
1791 DILocation VLoc(VI->second.first);
1792 unsigned VSlot = VI->second.second;
1793 DbgScope *Scope = getDbgScope(VLoc.getScope().getNode(), NULL);
1794 Scope->AddVariable(new DbgVariable(DIVariable(Var), VSlot, false));
1798 /// SetDbgScopeBeginLabels - Update DbgScope begin labels for the scopes that
1799 /// start with this machine instruction.
1800 void DwarfDebug::SetDbgScopeBeginLabels(const MachineInstr *MI, unsigned Label) {
1801 InsnToDbgScopeMapTy::iterator I = DbgScopeBeginMap.find(MI);
1802 if (I == DbgScopeBeginMap.end())
1804 SmallVector<DbgScope *, 2> &SD = I->second;
1805 for (SmallVector<DbgScope *, 2>::iterator SDI = SD.begin(), SDE = SD.end();
1807 (*SDI)->setStartLabelID(Label);
1810 /// SetDbgScopeEndLabels - Update DbgScope end labels for the scopes that
1811 /// end with this machine instruction.
1812 void DwarfDebug::SetDbgScopeEndLabels(const MachineInstr *MI, unsigned Label) {
1813 InsnToDbgScopeMapTy::iterator I = DbgScopeEndMap.find(MI);
1814 if (I == DbgScopeEndMap.end())
1816 SmallVector<DbgScope *, 2> &SD = I->second;
1817 for (SmallVector<DbgScope *, 2>::iterator SDI = SD.begin(), SDE = SD.end();
1819 (*SDI)->setEndLabelID(Label);
1822 /// ExtractScopeInformation - Scan machine instructions in this function
1823 /// and collect DbgScopes. Return true, if atleast one scope was found.
1824 bool DwarfDebug::ExtractScopeInformation(MachineFunction *MF) {
1825 // If scope information was extracted using .dbg intrinsics then there is not
1826 // any need to extract these information by scanning each instruction.
1827 if (!DbgScopeMap.empty())
1830 // Scan each instruction and create scopes.
1831 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
1833 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
1835 const MachineInstr *MInsn = II;
1836 DebugLoc DL = MInsn->getDebugLoc();
1839 DebugLocTuple DLT = MF->getDebugLocTuple(DL);
1840 if (!DLT.CompileUnit)
1842 // There is no need to create another DIE for compile unit. For all
1843 // other scopes, create one DbgScope now. This will be translated
1844 // into a scope DIE at the end.
1845 DIDescriptor D(DLT.CompileUnit);
1846 if (!D.isCompileUnit()) {
1847 DbgScope *Scope = getDbgScope(DLT.CompileUnit, MInsn);
1848 Scope->setLastInsn(MInsn);
1853 // If a scope's last instruction is not set then use its child scope's
1854 // last instruction as this scope's last instrunction.
1855 for (DenseMap<MDNode *, DbgScope *>::iterator DI = DbgScopeMap.begin(),
1856 DE = DbgScopeMap.end(); DI != DE; ++DI) {
1857 assert (DI->second->getFirstInsn() && "Invalid first instruction!");
1858 DI->second->FixInstructionMarkers();
1859 assert (DI->second->getLastInsn() && "Invalid last instruction!");
1862 // Each scope has first instruction and last instruction to mark beginning
1863 // and end of a scope respectively. Create an inverse map that list scopes
1864 // starts (and ends) with an instruction. One instruction may start (or end)
1866 for (DenseMap<MDNode *, DbgScope *>::iterator DI = DbgScopeMap.begin(),
1867 DE = DbgScopeMap.end(); DI != DE; ++DI) {
1868 DbgScope *S = DI->second;
1869 assert (S && "DbgScope is missing!");
1870 const MachineInstr *MI = S->getFirstInsn();
1871 assert (MI && "DbgScope does not have first instruction!");
1873 InsnToDbgScopeMapTy::iterator IDI = DbgScopeBeginMap.find(MI);
1874 if (IDI != DbgScopeBeginMap.end())
1875 IDI->second.push_back(S);
1877 DbgScopeBeginMap.insert(std::make_pair(MI,
1878 SmallVector<DbgScope *, 2>(2, S)));
1880 MI = S->getLastInsn();
1881 assert (MI && "DbgScope does not have last instruction!");
1882 IDI = DbgScopeEndMap.find(MI);
1883 if (IDI != DbgScopeEndMap.end())
1884 IDI->second.push_back(S);
1886 DbgScopeEndMap.insert(std::make_pair(MI,
1887 SmallVector<DbgScope *, 2>(2, S)));
1890 return !DbgScopeMap.empty();
1893 /// BeginFunction - Gather pre-function debug information. Assumes being
1894 /// emitted immediately after the function entry point.
1895 void DwarfDebug::BeginFunction(MachineFunction *MF) {
1898 if (!ShouldEmitDwarfDebug()) return;
1900 if (TimePassesIsEnabled)
1901 DebugTimer->startTimer();
1903 #ifdef ATTACH_DEBUG_INFO_TO_AN_INSN
1904 if (!ExtractScopeInformation(MF))
1906 CollectVariableInfo();
1909 // Begin accumulating function debug information.
1910 MMI->BeginFunction(MF);
1912 // Assumes in correct section after the entry point.
1913 EmitLabel("func_begin", ++SubprogramCount);
1915 // Emit label for the implicitly defined dbg.stoppoint at the start of the
1917 DebugLoc FDL = MF->getDefaultDebugLoc();
1918 if (!FDL.isUnknown()) {
1919 DebugLocTuple DLT = MF->getDebugLocTuple(FDL);
1920 unsigned LabelID = RecordSourceLine(DLT.Line, DLT.Col, DLT.CompileUnit);
1921 Asm->printLabel(LabelID);
1925 if (TimePassesIsEnabled)
1926 DebugTimer->stopTimer();
1929 /// EndFunction - Gather and emit post-function debug information.
1931 void DwarfDebug::EndFunction(MachineFunction *MF) {
1932 if (!ShouldEmitDwarfDebug()) return;
1934 if (TimePassesIsEnabled)
1935 DebugTimer->startTimer();
1937 // Define end label for subprogram.
1938 EmitLabel("func_end", SubprogramCount);
1940 // Get function line info.
1941 if (!Lines.empty()) {
1942 // Get section line info.
1943 unsigned ID = SectionMap.insert(Asm->getCurrentSection());
1944 if (SectionSourceLines.size() < ID) SectionSourceLines.resize(ID);
1945 std::vector<SrcLineInfo> &SectionLineInfos = SectionSourceLines[ID-1];
1946 // Append the function info to section info.
1947 SectionLineInfos.insert(SectionLineInfos.end(),
1948 Lines.begin(), Lines.end());
1951 // Construct the DbgScope for abstract instances.
1952 for (SmallVector<DbgScope *, 32>::iterator
1953 I = AbstractInstanceRootList.begin(),
1954 E = AbstractInstanceRootList.end(); I != E; ++I)
1955 ConstructFunctionDbgScope(*I);
1957 // Construct scopes for subprogram.
1958 if (FunctionDbgScope)
1959 ConstructFunctionDbgScope(FunctionDbgScope);
1961 // FIXME: This is wrong. We are essentially getting past a problem with
1962 // debug information not being able to handle unreachable blocks that have
1963 // debug information in them. In particular, those unreachable blocks that
1964 // have "region end" info in them. That situation results in the "root
1965 // scope" not being created. If that's the case, then emit a "default"
1966 // scope, i.e., one that encompasses the whole function. This isn't
1967 // desirable. And a better way of handling this (and all of the debugging
1968 // information) needs to be explored.
1969 ConstructDefaultDbgScope(MF);
1971 DebugFrames.push_back(FunctionDebugFrameInfo(SubprogramCount,
1972 MMI->getFrameMoves()));
1975 if (FunctionDbgScope) {
1976 delete FunctionDbgScope;
1977 DbgScopeMap.clear();
1978 DbgScopeBeginMap.clear();
1979 DbgScopeEndMap.clear();
1980 DbgAbstractScopeMap.clear();
1981 DbgConcreteScopeMap.clear();
1982 FunctionDbgScope = NULL;
1983 LexicalScopeStack.clear();
1984 AbstractInstanceRootList.clear();
1985 AbstractInstanceRootMap.clear();
1990 if (TimePassesIsEnabled)
1991 DebugTimer->stopTimer();
1994 /// RecordSourceLine - Records location information and associates it with a
1995 /// label. Returns a unique label ID used to generate a label and provide
1996 /// correspondence to the source line list.
1997 unsigned DwarfDebug::RecordSourceLine(unsigned Line, unsigned Col,
2002 if (TimePassesIsEnabled)
2003 DebugTimer->startTimer();
2005 const char *Dir = NULL;
2006 const char *Fn = NULL;
2008 DIDescriptor Scope(S);
2009 if (Scope.isCompileUnit()) {
2010 DICompileUnit CU(S);
2011 Dir = CU.getDirectory();
2012 Fn = CU.getFilename();
2013 } else if (Scope.isSubprogram()) {
2015 Dir = SP.getDirectory();
2016 Fn = SP.getFilename();
2017 } else if (Scope.isLexicalBlock()) {
2018 DILexicalBlock DB(S);
2019 Dir = DB.getDirectory();
2020 Fn = DB.getFilename();
2022 assert (0 && "Unexpected scope info");
2024 unsigned Src = GetOrCreateSourceID(Dir, Fn);
2025 unsigned ID = MMI->NextLabelID();
2026 Lines.push_back(SrcLineInfo(Line, Col, Src, ID));
2028 if (TimePassesIsEnabled)
2029 DebugTimer->stopTimer();
2034 /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
2035 /// timed. Look up the source id with the given directory and source file
2036 /// names. If none currently exists, create a new id and insert it in the
2037 /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
2039 unsigned DwarfDebug::getOrCreateSourceID(const std::string &DirName,
2040 const std::string &FileName) {
2041 if (TimePassesIsEnabled)
2042 DebugTimer->startTimer();
2044 unsigned SrcId = GetOrCreateSourceID(DirName.c_str(), FileName.c_str());
2046 if (TimePassesIsEnabled)
2047 DebugTimer->stopTimer();
2052 /// RecordRegionStart - Indicate the start of a region.
2053 unsigned DwarfDebug::RecordRegionStart(MDNode *N) {
2054 if (TimePassesIsEnabled)
2055 DebugTimer->startTimer();
2057 DbgScope *Scope = getOrCreateScope(N);
2058 unsigned ID = MMI->NextLabelID();
2059 if (!Scope->getStartLabelID()) Scope->setStartLabelID(ID);
2060 LexicalScopeStack.push_back(Scope);
2062 if (TimePassesIsEnabled)
2063 DebugTimer->stopTimer();
2068 /// RecordRegionEnd - Indicate the end of a region.
2069 unsigned DwarfDebug::RecordRegionEnd(MDNode *N) {
2070 if (TimePassesIsEnabled)
2071 DebugTimer->startTimer();
2073 DbgScope *Scope = getOrCreateScope(N);
2074 unsigned ID = MMI->NextLabelID();
2075 Scope->setEndLabelID(ID);
2076 // FIXME : region.end() may not be in the last basic block.
2077 // For now, do not pop last lexical scope because next basic
2078 // block may start new inlined function's body.
2079 unsigned LSSize = LexicalScopeStack.size();
2080 if (LSSize != 0 && LSSize != 1)
2081 LexicalScopeStack.pop_back();
2083 if (TimePassesIsEnabled)
2084 DebugTimer->stopTimer();
2089 /// RecordVariable - Indicate the declaration of a local variable.
2090 void DwarfDebug::RecordVariable(MDNode *N, unsigned FrameIndex) {
2091 if (TimePassesIsEnabled)
2092 DebugTimer->startTimer();
2094 DIDescriptor Desc(N);
2095 DbgScope *Scope = NULL;
2096 bool InlinedFnVar = false;
2098 if (Desc.getTag() == dwarf::DW_TAG_variable)
2099 Scope = getOrCreateScope(DIGlobalVariable(N).getContext().getNode());
2101 bool InlinedVar = false;
2102 MDNode *Context = DIVariable(N).getContext().getNode();
2103 DISubprogram SP(Context);
2105 // SP is inserted into DbgAbstractScopeMap when inlined function
2106 // start was recorded by RecordInlineFnStart.
2107 DenseMap<MDNode *, DbgScope *>::iterator
2108 I = DbgAbstractScopeMap.find(SP.getNode());
2109 if (I != DbgAbstractScopeMap.end()) {
2115 Scope = getOrCreateScope(Context);
2118 assert(Scope && "Unable to find the variable's scope");
2119 DbgVariable *DV = new DbgVariable(DIVariable(N), FrameIndex, InlinedFnVar);
2120 Scope->AddVariable(DV);
2122 if (TimePassesIsEnabled)
2123 DebugTimer->stopTimer();
2126 //// RecordInlinedFnStart - Indicate the start of inlined subroutine.
2127 unsigned DwarfDebug::RecordInlinedFnStart(DISubprogram &SP, DICompileUnit CU,
2128 unsigned Line, unsigned Col) {
2129 unsigned LabelID = MMI->NextLabelID();
2131 if (!MAI->doesDwarfUsesInlineInfoSection())
2134 if (TimePassesIsEnabled)
2135 DebugTimer->startTimer();
2137 MDNode *Node = SP.getNode();
2138 DenseMap<const MDNode *, DbgScope *>::iterator
2139 II = AbstractInstanceRootMap.find(Node);
2141 if (II == AbstractInstanceRootMap.end()) {
2142 // Create an abstract instance entry for this inlined function if it doesn't
2144 DbgScope *Scope = new DbgScope(NULL, DIDescriptor(Node));
2146 // Get the compile unit context.
2147 DIE *SPDie = ModuleCU->getDieMapSlotFor(Node);
2149 SPDie = CreateSubprogramDIE(ModuleCU, SP, false, true);
2151 // Mark as being inlined. This makes this subprogram entry an abstract
2153 // FIXME: Our debugger doesn't care about the value of DW_AT_inline, only
2154 // that it's defined. That probably won't change in the future. However,
2155 // this could be more elegant.
2156 AddUInt(SPDie, dwarf::DW_AT_inline, 0, dwarf::DW_INL_declared_not_inlined);
2158 // Keep track of the abstract scope for this function.
2159 DbgAbstractScopeMap[Node] = Scope;
2161 AbstractInstanceRootMap[Node] = Scope;
2162 AbstractInstanceRootList.push_back(Scope);
2165 // Create a concrete inlined instance for this inlined function.
2166 DbgConcreteScope *ConcreteScope = new DbgConcreteScope(DIDescriptor(Node));
2167 DIE *ScopeDie = new DIE(dwarf::DW_TAG_inlined_subroutine);
2168 ScopeDie->setAbstractCompileUnit(ModuleCU);
2170 DIE *Origin = ModuleCU->getDieMapSlotFor(Node);
2171 AddDIEEntry(ScopeDie, dwarf::DW_AT_abstract_origin,
2172 dwarf::DW_FORM_ref4, Origin);
2173 AddUInt(ScopeDie, dwarf::DW_AT_call_file, 0, ModuleCU->getID());
2174 AddUInt(ScopeDie, dwarf::DW_AT_call_line, 0, Line);
2175 AddUInt(ScopeDie, dwarf::DW_AT_call_column, 0, Col);
2177 ConcreteScope->setDie(ScopeDie);
2178 ConcreteScope->setStartLabelID(LabelID);
2179 MMI->RecordUsedDbgLabel(LabelID);
2181 LexicalScopeStack.back()->AddConcreteInst(ConcreteScope);
2183 // Keep track of the concrete scope that's inlined into this function.
2184 DenseMap<MDNode *, SmallVector<DbgScope *, 8> >::iterator
2185 SI = DbgConcreteScopeMap.find(Node);
2187 if (SI == DbgConcreteScopeMap.end())
2188 DbgConcreteScopeMap[Node].push_back(ConcreteScope);
2190 SI->second.push_back(ConcreteScope);
2192 // Track the start label for this inlined function.
2193 DenseMap<MDNode *, SmallVector<unsigned, 4> >::iterator
2194 I = InlineInfo.find(Node);
2196 if (I == InlineInfo.end())
2197 InlineInfo[Node].push_back(LabelID);
2199 I->second.push_back(LabelID);
2201 if (TimePassesIsEnabled)
2202 DebugTimer->stopTimer();
2207 /// RecordInlinedFnEnd - Indicate the end of inlined subroutine.
2208 unsigned DwarfDebug::RecordInlinedFnEnd(DISubprogram &SP) {
2209 if (!MAI->doesDwarfUsesInlineInfoSection())
2212 if (TimePassesIsEnabled)
2213 DebugTimer->startTimer();
2215 MDNode *Node = SP.getNode();
2216 DenseMap<MDNode *, SmallVector<DbgScope *, 8> >::iterator
2217 I = DbgConcreteScopeMap.find(Node);
2219 if (I == DbgConcreteScopeMap.end()) {
2220 // FIXME: Can this situation actually happen? And if so, should it?
2221 if (TimePassesIsEnabled)
2222 DebugTimer->stopTimer();
2227 SmallVector<DbgScope *, 8> &Scopes = I->second;
2228 if (Scopes.empty()) {
2229 // Returned ID is 0 if this is unbalanced "end of inlined
2230 // scope". This could happen if optimizer eats dbg intrinsics
2231 // or "beginning of inlined scope" is not recoginized due to
2232 // missing location info. In such cases, ignore this region.end.
2236 DbgScope *Scope = Scopes.back(); Scopes.pop_back();
2237 unsigned ID = MMI->NextLabelID();
2238 MMI->RecordUsedDbgLabel(ID);
2239 Scope->setEndLabelID(ID);
2241 if (TimePassesIsEnabled)
2242 DebugTimer->stopTimer();
2247 //===----------------------------------------------------------------------===//
2249 //===----------------------------------------------------------------------===//
2251 /// SizeAndOffsetDie - Compute the size and offset of a DIE.
2253 unsigned DwarfDebug::SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last) {
2254 // Get the children.
2255 const std::vector<DIE *> &Children = Die->getChildren();
2257 // If not last sibling and has children then add sibling offset attribute.
2258 if (!Last && !Children.empty()) Die->AddSiblingOffset();
2260 // Record the abbreviation.
2261 AssignAbbrevNumber(Die->getAbbrev());
2263 // Get the abbreviation for this DIE.
2264 unsigned AbbrevNumber = Die->getAbbrevNumber();
2265 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2268 Die->setOffset(Offset);
2270 // Start the size with the size of abbreviation code.
2271 Offset += MCAsmInfo::getULEB128Size(AbbrevNumber);
2273 const SmallVector<DIEValue*, 32> &Values = Die->getValues();
2274 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2276 // Size the DIE attribute values.
2277 for (unsigned i = 0, N = Values.size(); i < N; ++i)
2278 // Size attribute value.
2279 Offset += Values[i]->SizeOf(TD, AbbrevData[i].getForm());
2281 // Size the DIE children if any.
2282 if (!Children.empty()) {
2283 assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
2284 "Children flag not set");
2286 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2287 Offset = SizeAndOffsetDie(Children[j], Offset, (j + 1) == M);
2289 // End of children marker.
2290 Offset += sizeof(int8_t);
2293 Die->setSize(Offset - Die->getOffset());
2297 /// SizeAndOffsets - Compute the size and offset of all the DIEs.
2299 void DwarfDebug::SizeAndOffsets() {
2300 // Compute size of compile unit header.
2301 static unsigned Offset =
2302 sizeof(int32_t) + // Length of Compilation Unit Info
2303 sizeof(int16_t) + // DWARF version number
2304 sizeof(int32_t) + // Offset Into Abbrev. Section
2305 sizeof(int8_t); // Pointer Size (in bytes)
2307 SizeAndOffsetDie(ModuleCU->getDie(), Offset, true);
2308 CompileUnitOffsets[ModuleCU] = 0;
2311 /// EmitInitial - Emit initial Dwarf declarations. This is necessary for cc
2312 /// tools to recognize the object file contains Dwarf information.
2313 void DwarfDebug::EmitInitial() {
2314 // Check to see if we already emitted intial headers.
2315 if (didInitial) return;
2318 const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
2320 // Dwarf sections base addresses.
2321 if (MAI->doesDwarfRequireFrameSection()) {
2322 Asm->OutStreamer.SwitchSection(TLOF.getDwarfFrameSection());
2323 EmitLabel("section_debug_frame", 0);
2326 Asm->OutStreamer.SwitchSection(TLOF.getDwarfInfoSection());
2327 EmitLabel("section_info", 0);
2328 Asm->OutStreamer.SwitchSection(TLOF.getDwarfAbbrevSection());
2329 EmitLabel("section_abbrev", 0);
2330 Asm->OutStreamer.SwitchSection(TLOF.getDwarfARangesSection());
2331 EmitLabel("section_aranges", 0);
2333 if (const MCSection *LineInfoDirective = TLOF.getDwarfMacroInfoSection()) {
2334 Asm->OutStreamer.SwitchSection(LineInfoDirective);
2335 EmitLabel("section_macinfo", 0);
2338 Asm->OutStreamer.SwitchSection(TLOF.getDwarfLineSection());
2339 EmitLabel("section_line", 0);
2340 Asm->OutStreamer.SwitchSection(TLOF.getDwarfLocSection());
2341 EmitLabel("section_loc", 0);
2342 Asm->OutStreamer.SwitchSection(TLOF.getDwarfPubNamesSection());
2343 EmitLabel("section_pubnames", 0);
2344 Asm->OutStreamer.SwitchSection(TLOF.getDwarfStrSection());
2345 EmitLabel("section_str", 0);
2346 Asm->OutStreamer.SwitchSection(TLOF.getDwarfRangesSection());
2347 EmitLabel("section_ranges", 0);
2349 Asm->OutStreamer.SwitchSection(TLOF.getTextSection());
2350 EmitLabel("text_begin", 0);
2351 Asm->OutStreamer.SwitchSection(TLOF.getDataSection());
2352 EmitLabel("data_begin", 0);
2355 /// EmitDIE - Recusively Emits a debug information entry.
2357 void DwarfDebug::EmitDIE(DIE *Die) {
2358 // Get the abbreviation for this DIE.
2359 unsigned AbbrevNumber = Die->getAbbrevNumber();
2360 const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
2364 // Emit the code (index) for the abbreviation.
2365 Asm->EmitULEB128Bytes(AbbrevNumber);
2367 if (Asm->isVerbose())
2368 Asm->EOL(std::string("Abbrev [" +
2369 utostr(AbbrevNumber) +
2370 "] 0x" + utohexstr(Die->getOffset()) +
2371 ":0x" + utohexstr(Die->getSize()) + " " +
2372 dwarf::TagString(Abbrev->getTag())));
2376 SmallVector<DIEValue*, 32> &Values = Die->getValues();
2377 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
2379 // Emit the DIE attribute values.
2380 for (unsigned i = 0, N = Values.size(); i < N; ++i) {
2381 unsigned Attr = AbbrevData[i].getAttribute();
2382 unsigned Form = AbbrevData[i].getForm();
2383 assert(Form && "Too many attributes for DIE (check abbreviation)");
2386 case dwarf::DW_AT_sibling:
2387 Asm->EmitInt32(Die->SiblingOffset());
2389 case dwarf::DW_AT_abstract_origin: {
2390 DIEEntry *E = cast<DIEEntry>(Values[i]);
2391 DIE *Origin = E->getEntry();
2393 CompileUnitOffsets[Die->getAbstractCompileUnit()] +
2394 Origin->getOffset();
2396 Asm->EmitInt32(Addr);
2400 // Emit an attribute using the defined form.
2401 Values[i]->EmitValue(this, Form);
2405 Asm->EOL(dwarf::AttributeString(Attr));
2408 // Emit the DIE children if any.
2409 if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
2410 const std::vector<DIE *> &Children = Die->getChildren();
2412 for (unsigned j = 0, M = Children.size(); j < M; ++j)
2413 EmitDIE(Children[j]);
2415 Asm->EmitInt8(0); Asm->EOL("End Of Children Mark");
2419 /// EmitDebugInfo / EmitDebugInfoPerCU - Emit the debug info section.
2421 void DwarfDebug::EmitDebugInfoPerCU(CompileUnit *Unit) {
2422 DIE *Die = Unit->getDie();
2424 // Emit the compile units header.
2425 EmitLabel("info_begin", Unit->getID());
2427 // Emit size of content not including length itself
2428 unsigned ContentSize = Die->getSize() +
2429 sizeof(int16_t) + // DWARF version number
2430 sizeof(int32_t) + // Offset Into Abbrev. Section
2431 sizeof(int8_t) + // Pointer Size (in bytes)
2432 sizeof(int32_t); // FIXME - extra pad for gdb bug.
2434 Asm->EmitInt32(ContentSize); Asm->EOL("Length of Compilation Unit Info");
2435 Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("DWARF version number");
2436 EmitSectionOffset("abbrev_begin", "section_abbrev", 0, 0, true, false);
2437 Asm->EOL("Offset Into Abbrev. Section");
2438 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
2441 // FIXME - extra padding for gdb bug.
2442 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2443 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2444 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2445 Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
2446 EmitLabel("info_end", Unit->getID());
2451 void DwarfDebug::EmitDebugInfo() {
2452 // Start debug info section.
2453 Asm->OutStreamer.SwitchSection(
2454 Asm->getObjFileLowering().getDwarfInfoSection());
2456 EmitDebugInfoPerCU(ModuleCU);
2459 /// EmitAbbreviations - Emit the abbreviation section.
2461 void DwarfDebug::EmitAbbreviations() const {
2462 // Check to see if it is worth the effort.
2463 if (!Abbreviations.empty()) {
2464 // Start the debug abbrev section.
2465 Asm->OutStreamer.SwitchSection(
2466 Asm->getObjFileLowering().getDwarfAbbrevSection());
2468 EmitLabel("abbrev_begin", 0);
2470 // For each abbrevation.
2471 for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
2472 // Get abbreviation data
2473 const DIEAbbrev *Abbrev = Abbreviations[i];
2475 // Emit the abbrevations code (base 1 index.)
2476 Asm->EmitULEB128Bytes(Abbrev->getNumber());
2477 Asm->EOL("Abbreviation Code");
2479 // Emit the abbreviations data.
2485 // Mark end of abbreviations.
2486 Asm->EmitULEB128Bytes(0); Asm->EOL("EOM(3)");
2488 EmitLabel("abbrev_end", 0);
2493 /// EmitEndOfLineMatrix - Emit the last address of the section and the end of
2494 /// the line matrix.
2496 void DwarfDebug::EmitEndOfLineMatrix(unsigned SectionEnd) {
2497 // Define last address of section.
2498 Asm->EmitInt8(0); Asm->EOL("Extended Op");
2499 Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
2500 Asm->EmitInt8(dwarf::DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
2501 EmitReference("section_end", SectionEnd); Asm->EOL("Section end label");
2503 // Mark end of matrix.
2504 Asm->EmitInt8(0); Asm->EOL("DW_LNE_end_sequence");
2505 Asm->EmitULEB128Bytes(1); Asm->EOL();
2506 Asm->EmitInt8(1); Asm->EOL();
2509 /// EmitDebugLines - Emit source line information.
2511 void DwarfDebug::EmitDebugLines() {
2512 // If the target is using .loc/.file, the assembler will be emitting the
2513 // .debug_line table automatically.
2514 if (MAI->hasDotLocAndDotFile())
2517 // Minimum line delta, thus ranging from -10..(255-10).
2518 const int MinLineDelta = -(dwarf::DW_LNS_fixed_advance_pc + 1);
2519 // Maximum line delta, thus ranging from -10..(255-10).
2520 const int MaxLineDelta = 255 + MinLineDelta;
2522 // Start the dwarf line section.
2523 Asm->OutStreamer.SwitchSection(
2524 Asm->getObjFileLowering().getDwarfLineSection());
2526 // Construct the section header.
2527 EmitDifference("line_end", 0, "line_begin", 0, true);
2528 Asm->EOL("Length of Source Line Info");
2529 EmitLabel("line_begin", 0);
2531 Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("DWARF version number");
2533 EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0, true);
2534 Asm->EOL("Prolog Length");
2535 EmitLabel("line_prolog_begin", 0);
2537 Asm->EmitInt8(1); Asm->EOL("Minimum Instruction Length");
2539 Asm->EmitInt8(1); Asm->EOL("Default is_stmt_start flag");
2541 Asm->EmitInt8(MinLineDelta); Asm->EOL("Line Base Value (Special Opcodes)");
2543 Asm->EmitInt8(MaxLineDelta); Asm->EOL("Line Range Value (Special Opcodes)");
2545 Asm->EmitInt8(-MinLineDelta); Asm->EOL("Special Opcode Base");
2547 // Line number standard opcode encodings argument count
2548 Asm->EmitInt8(0); Asm->EOL("DW_LNS_copy arg count");
2549 Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_pc arg count");
2550 Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_line arg count");
2551 Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_file arg count");
2552 Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_column arg count");
2553 Asm->EmitInt8(0); Asm->EOL("DW_LNS_negate_stmt arg count");
2554 Asm->EmitInt8(0); Asm->EOL("DW_LNS_set_basic_block arg count");
2555 Asm->EmitInt8(0); Asm->EOL("DW_LNS_const_add_pc arg count");
2556 Asm->EmitInt8(1); Asm->EOL("DW_LNS_fixed_advance_pc arg count");
2558 // Emit directories.
2559 for (unsigned DI = 1, DE = getNumSourceDirectories()+1; DI != DE; ++DI) {
2560 Asm->EmitString(getSourceDirectoryName(DI));
2561 Asm->EOL("Directory");
2564 Asm->EmitInt8(0); Asm->EOL("End of directories");
2567 for (unsigned SI = 1, SE = getNumSourceIds()+1; SI != SE; ++SI) {
2568 // Remember source id starts at 1.
2569 std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(SI);
2570 Asm->EmitString(getSourceFileName(Id.second));
2572 Asm->EmitULEB128Bytes(Id.first);
2573 Asm->EOL("Directory #");
2574 Asm->EmitULEB128Bytes(0);
2575 Asm->EOL("Mod date");
2576 Asm->EmitULEB128Bytes(0);
2577 Asm->EOL("File size");
2580 Asm->EmitInt8(0); Asm->EOL("End of files");
2582 EmitLabel("line_prolog_end", 0);
2584 // A sequence for each text section.
2585 unsigned SecSrcLinesSize = SectionSourceLines.size();
2587 for (unsigned j = 0; j < SecSrcLinesSize; ++j) {
2588 // Isolate current sections line info.
2589 const std::vector<SrcLineInfo> &LineInfos = SectionSourceLines[j];
2591 /*if (Asm->isVerbose()) {
2592 const MCSection *S = SectionMap[j + 1];
2593 O << '\t' << MAI->getCommentString() << " Section"
2594 << S->getName() << '\n';
2598 // Dwarf assumes we start with first line of first source file.
2599 unsigned Source = 1;
2602 // Construct rows of the address, source, line, column matrix.
2603 for (unsigned i = 0, N = LineInfos.size(); i < N; ++i) {
2604 const SrcLineInfo &LineInfo = LineInfos[i];
2605 unsigned LabelID = MMI->MappedLabel(LineInfo.getLabelID());
2606 if (!LabelID) continue;
2608 if (LineInfo.getLine() == 0) continue;
2610 if (!Asm->isVerbose())
2613 std::pair<unsigned, unsigned> SourceID =
2614 getSourceDirectoryAndFileIds(LineInfo.getSourceID());
2615 O << '\t' << MAI->getCommentString() << ' '
2616 << getSourceDirectoryName(SourceID.first) << ' '
2617 << getSourceFileName(SourceID.second)
2618 <<" :" << utostr_32(LineInfo.getLine()) << '\n';
2621 // Define the line address.
2622 Asm->EmitInt8(0); Asm->EOL("Extended Op");
2623 Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
2624 Asm->EmitInt8(dwarf::DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
2625 EmitReference("label", LabelID); Asm->EOL("Location label");
2627 // If change of source, then switch to the new source.
2628 if (Source != LineInfo.getSourceID()) {
2629 Source = LineInfo.getSourceID();
2630 Asm->EmitInt8(dwarf::DW_LNS_set_file); Asm->EOL("DW_LNS_set_file");
2631 Asm->EmitULEB128Bytes(Source); Asm->EOL("New Source");
2634 // If change of line.
2635 if (Line != LineInfo.getLine()) {
2636 // Determine offset.
2637 int Offset = LineInfo.getLine() - Line;
2638 int Delta = Offset - MinLineDelta;
2641 Line = LineInfo.getLine();
2643 // If delta is small enough and in range...
2644 if (Delta >= 0 && Delta < (MaxLineDelta - 1)) {
2645 // ... then use fast opcode.
2646 Asm->EmitInt8(Delta - MinLineDelta); Asm->EOL("Line Delta");
2648 // ... otherwise use long hand.
2649 Asm->EmitInt8(dwarf::DW_LNS_advance_line);
2650 Asm->EOL("DW_LNS_advance_line");
2651 Asm->EmitSLEB128Bytes(Offset); Asm->EOL("Line Offset");
2652 Asm->EmitInt8(dwarf::DW_LNS_copy); Asm->EOL("DW_LNS_copy");
2655 // Copy the previous row (different address or source)
2656 Asm->EmitInt8(dwarf::DW_LNS_copy); Asm->EOL("DW_LNS_copy");
2660 EmitEndOfLineMatrix(j + 1);
2663 if (SecSrcLinesSize == 0)
2664 // Because we're emitting a debug_line section, we still need a line
2665 // table. The linker and friends expect it to exist. If there's nothing to
2666 // put into it, emit an empty table.
2667 EmitEndOfLineMatrix(1);
2669 EmitLabel("line_end", 0);
2673 /// EmitCommonDebugFrame - Emit common frame info into a debug frame section.
2675 void DwarfDebug::EmitCommonDebugFrame() {
2676 if (!MAI->doesDwarfRequireFrameSection())
2680 Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
2681 TargetFrameInfo::StackGrowsUp ?
2682 TD->getPointerSize() : -TD->getPointerSize();
2684 // Start the dwarf frame section.
2685 Asm->OutStreamer.SwitchSection(
2686 Asm->getObjFileLowering().getDwarfFrameSection());
2688 EmitLabel("debug_frame_common", 0);
2689 EmitDifference("debug_frame_common_end", 0,
2690 "debug_frame_common_begin", 0, true);
2691 Asm->EOL("Length of Common Information Entry");
2693 EmitLabel("debug_frame_common_begin", 0);
2694 Asm->EmitInt32((int)dwarf::DW_CIE_ID);
2695 Asm->EOL("CIE Identifier Tag");
2696 Asm->EmitInt8(dwarf::DW_CIE_VERSION);
2697 Asm->EOL("CIE Version");
2698 Asm->EmitString("");
2699 Asm->EOL("CIE Augmentation");
2700 Asm->EmitULEB128Bytes(1);
2701 Asm->EOL("CIE Code Alignment Factor");
2702 Asm->EmitSLEB128Bytes(stackGrowth);
2703 Asm->EOL("CIE Data Alignment Factor");
2704 Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), false));
2705 Asm->EOL("CIE RA Column");
2707 std::vector<MachineMove> Moves;
2708 RI->getInitialFrameState(Moves);
2710 EmitFrameMoves(NULL, 0, Moves, false);
2712 Asm->EmitAlignment(2, 0, 0, false);
2713 EmitLabel("debug_frame_common_end", 0);
2718 /// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
2721 DwarfDebug::EmitFunctionDebugFrame(const FunctionDebugFrameInfo&DebugFrameInfo){
2722 if (!MAI->doesDwarfRequireFrameSection())
2725 // Start the dwarf frame section.
2726 Asm->OutStreamer.SwitchSection(
2727 Asm->getObjFileLowering().getDwarfFrameSection());
2729 EmitDifference("debug_frame_end", DebugFrameInfo.Number,
2730 "debug_frame_begin", DebugFrameInfo.Number, true);
2731 Asm->EOL("Length of Frame Information Entry");
2733 EmitLabel("debug_frame_begin", DebugFrameInfo.Number);
2735 EmitSectionOffset("debug_frame_common", "section_debug_frame",
2737 Asm->EOL("FDE CIE offset");
2739 EmitReference("func_begin", DebugFrameInfo.Number);
2740 Asm->EOL("FDE initial location");
2741 EmitDifference("func_end", DebugFrameInfo.Number,
2742 "func_begin", DebugFrameInfo.Number);
2743 Asm->EOL("FDE address range");
2745 EmitFrameMoves("func_begin", DebugFrameInfo.Number, DebugFrameInfo.Moves,
2748 Asm->EmitAlignment(2, 0, 0, false);
2749 EmitLabel("debug_frame_end", DebugFrameInfo.Number);
2754 void DwarfDebug::EmitDebugPubNamesPerCU(CompileUnit *Unit) {
2755 EmitDifference("pubnames_end", Unit->getID(),
2756 "pubnames_begin", Unit->getID(), true);
2757 Asm->EOL("Length of Public Names Info");
2759 EmitLabel("pubnames_begin", Unit->getID());
2761 Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("DWARF Version");
2763 EmitSectionOffset("info_begin", "section_info",
2764 Unit->getID(), 0, true, false);
2765 Asm->EOL("Offset of Compilation Unit Info");
2767 EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID(),
2769 Asm->EOL("Compilation Unit Length");
2771 StringMap<DIE*> &Globals = Unit->getGlobals();
2772 for (StringMap<DIE*>::const_iterator
2773 GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
2774 const char *Name = GI->getKeyData();
2775 DIE * Entity = GI->second;
2777 Asm->EmitInt32(Entity->getOffset()); Asm->EOL("DIE offset");
2778 Asm->EmitString(Name, strlen(Name)); Asm->EOL("External Name");
2781 Asm->EmitInt32(0); Asm->EOL("End Mark");
2782 EmitLabel("pubnames_end", Unit->getID());
2787 /// EmitDebugPubNames - Emit visible names into a debug pubnames section.
2789 void DwarfDebug::EmitDebugPubNames() {
2790 // Start the dwarf pubnames section.
2791 Asm->OutStreamer.SwitchSection(
2792 Asm->getObjFileLowering().getDwarfPubNamesSection());
2794 EmitDebugPubNamesPerCU(ModuleCU);
2797 /// EmitDebugStr - Emit visible names into a debug str section.
2799 void DwarfDebug::EmitDebugStr() {
2800 // Check to see if it is worth the effort.
2801 if (!StringPool.empty()) {
2802 // Start the dwarf str section.
2803 Asm->OutStreamer.SwitchSection(
2804 Asm->getObjFileLowering().getDwarfStrSection());
2806 // For each of strings in the string pool.
2807 for (unsigned StringID = 1, N = StringPool.size();
2808 StringID <= N; ++StringID) {
2809 // Emit a label for reference from debug information entries.
2810 EmitLabel("string", StringID);
2812 // Emit the string itself.
2813 const std::string &String = StringPool[StringID];
2814 Asm->EmitString(String); Asm->EOL();
2821 /// EmitDebugLoc - Emit visible names into a debug loc section.
2823 void DwarfDebug::EmitDebugLoc() {
2824 // Start the dwarf loc section.
2825 Asm->OutStreamer.SwitchSection(
2826 Asm->getObjFileLowering().getDwarfLocSection());
2830 /// EmitDebugARanges - Emit visible names into a debug aranges section.
2832 void DwarfDebug::EmitDebugARanges() {
2833 // Start the dwarf aranges section.
2834 Asm->OutStreamer.SwitchSection(
2835 Asm->getObjFileLowering().getDwarfARangesSection());
2839 CompileUnit *Unit = GetBaseCompileUnit();
2841 // Don't include size of length
2842 Asm->EmitInt32(0x1c); Asm->EOL("Length of Address Ranges Info");
2844 Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("Dwarf Version");
2846 EmitReference("info_begin", Unit->getID());
2847 Asm->EOL("Offset of Compilation Unit Info");
2849 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Size of Address");
2851 Asm->EmitInt8(0); Asm->EOL("Size of Segment Descriptor");
2853 Asm->EmitInt16(0); Asm->EOL("Pad (1)");
2854 Asm->EmitInt16(0); Asm->EOL("Pad (2)");
2857 EmitReference("text_begin", 0); Asm->EOL("Address");
2858 EmitDifference("text_end", 0, "text_begin", 0, true); Asm->EOL("Length");
2860 Asm->EmitInt32(0); Asm->EOL("EOM (1)");
2861 Asm->EmitInt32(0); Asm->EOL("EOM (2)");
2867 /// EmitDebugRanges - Emit visible names into a debug ranges section.
2869 void DwarfDebug::EmitDebugRanges() {
2870 // Start the dwarf ranges section.
2871 Asm->OutStreamer.SwitchSection(
2872 Asm->getObjFileLowering().getDwarfRangesSection());
2876 /// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
2878 void DwarfDebug::EmitDebugMacInfo() {
2879 if (const MCSection *LineInfo =
2880 Asm->getObjFileLowering().getDwarfMacroInfoSection()) {
2881 // Start the dwarf macinfo section.
2882 Asm->OutStreamer.SwitchSection(LineInfo);
2887 /// EmitDebugInlineInfo - Emit inline info using following format.
2889 /// 1. length of section
2890 /// 2. Dwarf version number
2891 /// 3. address size.
2893 /// Entries (one "entry" for each function that was inlined):
2895 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
2896 /// otherwise offset into __debug_str for regular function name.
2897 /// 2. offset into __debug_str section for regular function name.
2898 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
2899 /// instances for the function.
2901 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
2902 /// inlined instance; the die_offset points to the inlined_subroutine die in the
2903 /// __debug_info section, and the low_pc is the starting address for the
2904 /// inlining instance.
2905 void DwarfDebug::EmitDebugInlineInfo() {
2906 if (!MAI->doesDwarfUsesInlineInfoSection())
2912 Asm->OutStreamer.SwitchSection(
2913 Asm->getObjFileLowering().getDwarfDebugInlineSection());
2915 EmitDifference("debug_inlined_end", 1,
2916 "debug_inlined_begin", 1, true);
2917 Asm->EOL("Length of Debug Inlined Information Entry");
2919 EmitLabel("debug_inlined_begin", 1);
2921 Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("Dwarf Version");
2922 Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
2924 for (DenseMap<MDNode *, SmallVector<unsigned, 4> >::iterator
2925 I = InlineInfo.begin(), E = InlineInfo.end(); I != E; ++I) {
2926 MDNode *Node = I->first;
2927 SmallVector<unsigned, 4> &Labels = I->second;
2928 DISubprogram SP(Node);
2929 const char *LName = SP.getLinkageName();
2930 const char *Name = SP.getName();
2933 Asm->EmitString(Name);
2935 // Skip special LLVM prefix that is used to inform the asm printer to not
2936 // emit usual symbol prefix before the symbol name. This happens for
2937 // Objective-C symbol names and symbol whose name is replaced using GCC's
2938 // __asm__ attribute.
2941 Asm->EmitString(LName);
2943 Asm->EOL("MIPS linkage name");
2945 Asm->EmitString(Name); Asm->EOL("Function name");
2947 Asm->EmitULEB128Bytes(Labels.size()); Asm->EOL("Inline count");
2949 for (SmallVector<unsigned, 4>::iterator LI = Labels.begin(),
2950 LE = Labels.end(); LI != LE; ++LI) {
2951 DIE *SP = ModuleCU->getDieMapSlotFor(Node);
2952 Asm->EmitInt32(SP->getOffset()); Asm->EOL("DIE offset");
2954 if (TD->getPointerSize() == sizeof(int32_t))
2955 O << MAI->getData32bitsDirective();
2957 O << MAI->getData64bitsDirective();
2959 PrintLabelName("label", *LI); Asm->EOL("low_pc");
2963 EmitLabel("debug_inlined_end", 1);