1 //===-- llvm/CodeGen/DwarfDebug.h - Dwarf Debug Framework ------*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains support for writing dwarf debug info into asm files.
12 //===----------------------------------------------------------------------===//
14 #ifndef CODEGEN_ASMPRINTER_DWARFDEBUG_H__
15 #define CODEGEN_ASMPRINTER_DWARFDEBUG_H__
18 #include "DwarfPrinter.h"
19 #include "llvm/CodeGen/AsmPrinter.h"
20 #include "llvm/CodeGen/MachineLocation.h"
21 #include "llvm/Analysis/DebugInfo.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include "llvm/ADT/DenseMap.h"
24 #include "llvm/ADT/FoldingSet.h"
25 #include "llvm/ADT/SmallSet.h"
26 #include "llvm/ADT/StringMap.h"
27 #include "llvm/ADT/UniqueVector.h"
33 class DbgConcreteScope;
36 class MachineFrameInfo;
37 class MachineModuleInfo;
41 //===----------------------------------------------------------------------===//
42 /// SrcLineInfo - This class is used to record source line correspondence.
45 unsigned Line; // Source line number.
46 unsigned Column; // Source column.
47 unsigned SourceID; // Source ID number.
48 MCSymbol *Label; // Label in code ID number.
50 SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label)
51 : Line(L), Column(C), SourceID(S), Label(label) {}
54 unsigned getLine() const { return Line; }
55 unsigned getColumn() const { return Column; }
56 unsigned getSourceID() const { return SourceID; }
57 MCSymbol *getLabel() const { return Label; }
60 class DwarfDebug : public DwarfPrinter {
61 //===--------------------------------------------------------------------===//
62 // Attributes used to construct specific Dwarf sections.
65 /// ModuleCU - All DIEs are inserted in ModuleCU.
66 CompileUnit *ModuleCU;
68 /// AbbreviationsSet - Used to uniquely define abbreviations.
70 FoldingSet<DIEAbbrev> AbbreviationsSet;
72 /// Abbreviations - A list of all the unique abbreviations in use.
74 std::vector<DIEAbbrev *> Abbreviations;
76 /// DirectoryIdMap - Directory name to directory id map.
78 StringMap<unsigned> DirectoryIdMap;
80 /// DirectoryNames - A list of directory names.
81 SmallVector<std::string, 8> DirectoryNames;
83 /// SourceFileIdMap - Source file name to source file id map.
85 StringMap<unsigned> SourceFileIdMap;
87 /// SourceFileNames - A list of source file names.
88 SmallVector<std::string, 8> SourceFileNames;
90 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
91 /// id mapped to a unique id.
92 DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
94 /// SourceIds - Reverse map from source id to directory id + file id pair.
96 SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
98 /// Lines - List of source line correspondence.
99 std::vector<SrcLineInfo> Lines;
101 /// DIEValues - A list of all the unique values in use.
103 std::vector<DIEValue *> DIEValues;
105 /// StringPool - A String->Symbol mapping of strings used by indirect
107 StringMap<std::pair<MCSymbol*, unsigned> > StringPool;
108 unsigned NextStringPoolNumber;
110 MCSymbol *getStringPoolEntry(StringRef Str);
112 /// SectionMap - Provides a unique id per text section.
114 UniqueVector<const MCSection*> SectionMap;
116 /// SectionSourceLines - Tracks line numbers per text section.
118 std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
120 /// didInitial - Flag to indicate if initial emission has been done.
124 /// shouldEmit - Flag to indicate if debug information should be emitted.
128 // CurrentFnDbgScope - Top level scope for the current function.
130 DbgScope *CurrentFnDbgScope;
132 /// DbgScopeMap - Tracks the scopes in the current function. Owns the
133 /// contained DbgScope*s.
135 DenseMap<MDNode *, DbgScope *> DbgScopeMap;
137 /// ConcreteScopes - Tracks the concrete scopees in the current function.
138 /// These scopes are also included in DbgScopeMap.
139 DenseMap<MDNode *, DbgScope *> ConcreteScopes;
141 /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
142 /// not included DbgScopeMap. AbstractScopes owns its DbgScope*s.
143 DenseMap<MDNode *, DbgScope *> AbstractScopes;
145 /// AbstractScopesList - Tracks abstract scopes constructed while processing
146 /// a function. This list is cleared during endFunction().
147 SmallVector<DbgScope *, 4>AbstractScopesList;
149 /// AbstractVariables - Collection on abstract variables. Owned by the
150 /// DbgScopes in AbstractScopes.
151 DenseMap<MDNode *, DbgVariable *> AbstractVariables;
153 /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
154 /// (at the end of the module) as DW_AT_inline.
155 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
157 DenseMap<DIE *, MDNode *> ContainingTypeMap;
159 /// AbstractSubprogramDIEs - Collection of abstruct subprogram DIEs.
160 SmallPtrSet<DIE *, 4> AbstractSubprogramDIEs;
162 /// TopLevelDIEs - Collection of top level DIEs.
163 SmallPtrSet<DIE *, 4> TopLevelDIEs;
164 SmallVector<DIE *, 4> TopLevelDIEsVector;
166 typedef SmallVector<DbgScope *, 2> ScopeVector;
167 typedef DenseMap<const MachineInstr *, ScopeVector>
170 /// DbgScopeBeginMap - Maps instruction with a list of DbgScopes it starts.
171 InsnToDbgScopeMapTy DbgScopeBeginMap;
173 /// DbgScopeEndMap - Maps instruction with a list DbgScopes it ends.
174 InsnToDbgScopeMapTy DbgScopeEndMap;
176 /// InlineInfo - Keep track of inlined functions and their location. This
177 /// information is used to populate debug_inlined section.
178 typedef std::pair<MCSymbol*, DIE *> InlineInfoLabels;
179 DenseMap<MDNode*, SmallVector<InlineInfoLabels, 4> > InlineInfo;
180 SmallVector<MDNode *, 4> InlinedSPNodes;
182 /// CompileUnitOffsets - A vector of the offsets of the compile units. This is
183 /// used when calculating the "origin" of a concrete instance of an inlined
185 DenseMap<CompileUnit *, unsigned> CompileUnitOffsets;
187 /// DebugTimer - Timer for the Dwarf debug writer.
190 struct FunctionDebugFrameInfo {
192 std::vector<MachineMove> Moves;
194 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
195 : Number(Num), Moves(M) {}
198 std::vector<FunctionDebugFrameInfo> DebugFrames;
200 /// getSourceDirectoryAndFileIds - Return the directory and file ids that
201 /// maps to the source id. Source id starts at 1.
202 std::pair<unsigned, unsigned>
203 getSourceDirectoryAndFileIds(unsigned SId) const {
204 return SourceIds[SId-1];
207 /// getNumSourceDirectories - Return the number of source directories in the
209 unsigned getNumSourceDirectories() const {
210 return DirectoryNames.size();
213 /// getSourceDirectoryName - Return the name of the directory corresponding
215 const std::string &getSourceDirectoryName(unsigned Id) const {
216 return DirectoryNames[Id - 1];
219 /// getSourceFileName - Return the name of the source file corresponding
221 const std::string &getSourceFileName(unsigned Id) const {
222 return SourceFileNames[Id - 1];
225 /// getNumSourceIds - Return the number of unique source ids.
226 unsigned getNumSourceIds() const {
227 return SourceIds.size();
230 /// assignAbbrevNumber - Define a unique number for the abbreviation.
232 void assignAbbrevNumber(DIEAbbrev &Abbrev);
234 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
235 /// information entry.
236 DIEEntry *createDIEEntry(DIE *Entry);
238 /// addUInt - Add an unsigned integer attribute data and value.
240 void addUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
242 /// addSInt - Add an signed integer attribute data and value.
244 void addSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);
246 /// addString - Add a string attribute data and value.
248 void addString(DIE *Die, unsigned Attribute, unsigned Form,
249 const StringRef Str);
251 /// addLabel - Add a Dwarf label attribute data and value.
253 void addLabel(DIE *Die, unsigned Attribute, unsigned Form,
254 const MCSymbol *Label);
256 /// addDelta - Add a label delta attribute data and value.
258 void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
259 const MCSymbol *Hi, const MCSymbol *Lo);
261 /// addDIEEntry - Add a DIE attribute data and value.
263 void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
264 Die->addValue(Attribute, Form, createDIEEntry(Entry));
267 /// addBlock - Add block data.
269 void addBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
271 /// addSourceLine - Add location information to specified debug information
273 void addSourceLine(DIE *Die, const DIVariable *V);
274 void addSourceLine(DIE *Die, const DIGlobal *G);
275 void addSourceLine(DIE *Die, const DISubprogram *SP);
276 void addSourceLine(DIE *Die, const DIType *Ty);
277 void addSourceLine(DIE *Die, const DINameSpace *NS);
279 /// addAddress - Add an address attribute to a die based on the location
281 void addAddress(DIE *Die, unsigned Attribute,
282 const MachineLocation &Location);
284 /// addComplexAddress - Start with the address based on the location provided,
285 /// and generate the DWARF information necessary to find the actual variable
286 /// (navigating the extra location information encoded in the type) based on
287 /// the starting location. Add the DWARF information to the die.
289 void addComplexAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
290 const MachineLocation &Location);
292 // FIXME: Should be reformulated in terms of addComplexAddress.
293 /// addBlockByrefAddress - Start with the address based on the location
294 /// provided, and generate the DWARF information necessary to find the
295 /// actual Block variable (navigating the Block struct) based on the
296 /// starting location. Add the DWARF information to the die. Obsolete,
297 /// please use addComplexAddress instead.
299 void addBlockByrefAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
300 const MachineLocation &Location);
302 /// addToContextOwner - Add Die into the list of its context owner's children.
303 void addToContextOwner(DIE *Die, DIDescriptor Context);
305 /// addType - Add a new type attribute to the specified entity.
306 void addType(DIE *Entity, DIType Ty);
309 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
310 DIE *getOrCreateNameSpace(DINameSpace NS);
312 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
314 DIE *getOrCreateTypeDIE(DIType Ty);
316 void addPubTypes(DISubprogram SP);
318 /// constructTypeDIE - Construct basic type die from DIBasicType.
319 void constructTypeDIE(DIE &Buffer,
322 /// constructTypeDIE - Construct derived type die from DIDerivedType.
323 void constructTypeDIE(DIE &Buffer,
326 /// constructTypeDIE - Construct type DIE from DICompositeType.
327 void constructTypeDIE(DIE &Buffer,
328 DICompositeType CTy);
330 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
331 void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
333 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
334 void constructArrayTypeDIE(DIE &Buffer,
335 DICompositeType *CTy);
337 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
338 DIE *constructEnumTypeDIE(DIEnumerator ETy);
340 /// createGlobalVariableDIE - Create new DIE using GV.
341 DIE *createGlobalVariableDIE(const DIGlobalVariable &GV);
343 /// createMemberDIE - Create new member DIE.
344 DIE *createMemberDIE(const DIDerivedType &DT);
346 /// createSubprogramDIE - Create new DIE using SP.
347 DIE *createSubprogramDIE(const DISubprogram &SP, bool MakeDecl = false);
349 /// getUpdatedDbgScope - Find or create DbgScope assicated with
350 /// the instruction. Initialize scope and update scope hierarchy.
351 DbgScope *getUpdatedDbgScope(MDNode *N, const MachineInstr *MI, MDNode *InlinedAt);
353 /// createDbgScope - Create DbgScope for the scope.
354 void createDbgScope(MDNode *Scope, MDNode *InlinedAt);
356 DbgScope *getOrCreateAbstractScope(MDNode *N);
358 /// findAbstractVariable - Find abstract variable associated with Var.
359 DbgVariable *findAbstractVariable(DIVariable &Var, unsigned FrameIdx,
361 DbgVariable *findAbstractVariable(DIVariable &Var, const MachineInstr *MI,
364 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
365 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
366 /// If there are global variables in this scope then create and insert
367 /// DIEs for these variables.
368 DIE *updateSubprogramScopeDIE(MDNode *SPNode);
370 /// constructLexicalScope - Construct new DW_TAG_lexical_block
371 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
372 DIE *constructLexicalScopeDIE(DbgScope *Scope);
374 /// constructInlinedScopeDIE - This scope represents inlined body of
375 /// a function. Construct DIE to represent this concrete inlined copy
377 DIE *constructInlinedScopeDIE(DbgScope *Scope);
379 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
380 DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
382 /// constructScopeDIE - Construct a DIE for this scope.
383 DIE *constructScopeDIE(DbgScope *Scope);
385 /// emitInitial - Emit initial Dwarf declarations. This is necessary for cc
386 /// tools to recognize the object file contains Dwarf information.
389 /// emitDIE - Recusively Emits a debug information entry.
391 void emitDIE(DIE *Die);
393 /// computeSizeAndOffset - Compute the size and offset of a DIE.
395 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
397 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
399 void computeSizeAndOffsets();
401 /// EmitDebugInfo - Emit the debug info section.
403 void emitDebugInfo();
405 /// emitAbbreviations - Emit the abbreviation section.
407 void emitAbbreviations() const;
409 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
412 void emitEndOfLineMatrix(unsigned SectionEnd);
414 /// emitDebugLines - Emit source line information.
416 void emitDebugLines();
418 /// emitCommonDebugFrame - Emit common frame info into a debug frame section.
420 void emitCommonDebugFrame();
422 /// emitFunctionDebugFrame - Emit per function frame info into a debug frame
424 void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
426 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
428 void emitDebugPubNames();
430 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
432 void emitDebugPubTypes();
434 /// emitDebugStr - Emit visible names into a debug str section.
438 /// emitDebugLoc - Emit visible names into a debug loc section.
442 /// EmitDebugARanges - Emit visible names into a debug aranges section.
444 void EmitDebugARanges();
446 /// emitDebugRanges - Emit visible names into a debug ranges section.
448 void emitDebugRanges();
450 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
452 void emitDebugMacInfo();
454 /// emitDebugInlineInfo - Emit inline info using following format.
456 /// 1. length of section
457 /// 2. Dwarf version number
460 /// Entries (one "entry" for each function that was inlined):
462 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
463 /// otherwise offset into __debug_str for regular function name.
464 /// 2. offset into __debug_str section for regular function name.
465 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
466 /// instances for the function.
468 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
469 /// inlined instance; the die_offset points to the inlined_subroutine die in
470 /// the __debug_info section, and the low_pc is the starting address for the
471 /// inlining instance.
472 void emitDebugInlineInfo();
474 /// GetOrCreateSourceID - Look up the source id with the given directory and
475 /// source file names. If none currently exists, create a new id and insert it
476 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
478 unsigned GetOrCreateSourceID(StringRef DirName, StringRef FileName);
480 void constructCompileUnit(MDNode *N);
482 void constructGlobalVariableDIE(MDNode *N);
484 void constructSubprogramDIE(MDNode *N);
486 // FIXME: This should go away in favor of complex addresses.
487 /// Find the type the programmer originally declared the variable to be
488 /// and return that type. Obsolete, use GetComplexAddrType instead.
490 DIType getBlockByrefType(DIType Ty, std::string Name);
493 //===--------------------------------------------------------------------===//
494 // Main entry points.
496 DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T);
497 virtual ~DwarfDebug();
499 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
501 bool ShouldEmitDwarfDebug() const { return shouldEmit; }
503 /// beginModule - Emit all Dwarf sections that should come prior to the
505 void beginModule(Module *M, MachineModuleInfo *MMI);
507 /// endModule - Emit all Dwarf sections that should come after the content.
511 /// beginFunction - Gather pre-function debug information. Assumes being
512 /// emitted immediately after the function entry point.
513 void beginFunction(const MachineFunction *MF);
515 /// endFunction - Gather and emit post-function debug information.
517 void endFunction(const MachineFunction *MF);
519 /// recordSourceLine - Register a source line with debug info. Returns the
520 /// unique label that was emitted and which provides correspondence to
521 /// the source line list.
522 MCSymbol *recordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
524 /// getSourceLineCount - Return the number of source lines in the debug
526 unsigned getSourceLineCount() const {
530 /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
531 /// timed. Look up the source id with the given directory and source file
532 /// names. If none currently exists, create a new id and insert it in the
533 /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
535 unsigned getOrCreateSourceID(const std::string &DirName,
536 const std::string &FileName);
538 /// extractScopeInformation - Scan machine instructions in this function
539 /// and collect DbgScopes. Return true, if atleast one scope was found.
540 bool extractScopeInformation();
542 /// collectVariableInfo - Populate DbgScope entries with variables' info.
543 void collectVariableInfo();
545 /// beginScope - Process beginning of a scope starting at Label.
546 void beginScope(const MachineInstr *MI, MCSymbol *Label);
548 /// endScope - Prcess end of a scope.
549 void endScope(const MachineInstr *MI);
551 } // End of namespace llvm