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 unsigned LabelID; // Label in code ID number.
50 SrcLineInfo(unsigned L, unsigned C, unsigned S, unsigned I)
51 : Line(L), Column(C), SourceID(S), LabelID(I) {}
54 unsigned getLine() const { return Line; }
55 unsigned getColumn() const { return Column; }
56 unsigned getSourceID() const { return SourceID; }
57 unsigned getLabelID() const { return LabelID; }
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 UniqueVector of strings used by indirect references.
107 UniqueVector<std::string> StringPool;
109 /// SectionMap - Provides a unique id per text section.
111 UniqueVector<const MCSection*> SectionMap;
113 /// SectionSourceLines - Tracks line numbers per text section.
115 std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
117 /// didInitial - Flag to indicate if initial emission has been done.
121 /// shouldEmit - Flag to indicate if debug information should be emitted.
125 // CurrentFnDbgScope - Top level scope for the current function.
127 DbgScope *CurrentFnDbgScope;
129 /// DbgScopeMap - Tracks the scopes in the current function.
131 DenseMap<MDNode *, DbgScope *> DbgScopeMap;
133 /// ConcreteScopes - Tracks the concrete scopees in the current function.
134 /// These scopes are also included in DbgScopeMap.
135 DenseMap<MDNode *, DbgScope *> ConcreteScopes;
137 /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
138 /// not included DbgScopeMap.
139 DenseMap<MDNode *, DbgScope *> AbstractScopes;
140 SmallVector<DbgScope *, 4>AbstractScopesList;
142 /// AbstractVariables - Collection on abstract variables.
143 DenseMap<MDNode *, DbgVariable *> AbstractVariables;
145 /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
146 /// (at the end of the module) as DW_AT_inline.
147 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
149 DenseMap<DIE *, MDNode *> ContainingTypeMap;
151 /// AbstractSubprogramDIEs - Collection of abstruct subprogram DIEs.
152 SmallPtrSet<DIE *, 4> AbstractSubprogramDIEs;
154 /// TopLevelDIEs - Collection of top level DIEs.
155 SmallPtrSet<DIE *, 4> TopLevelDIEs;
156 SmallVector<DIE *, 4> TopLevelDIEsVector;
158 typedef SmallVector<DbgScope *, 2> ScopeVector;
159 typedef DenseMap<const MachineInstr *, ScopeVector>
162 /// DbgScopeBeginMap - Maps instruction with a list of DbgScopes it starts.
163 InsnToDbgScopeMapTy DbgScopeBeginMap;
165 /// DbgScopeEndMap - Maps instruction with a list DbgScopes it ends.
166 InsnToDbgScopeMapTy DbgScopeEndMap;
168 /// InlineInfo - Keep track of inlined functions and their location. This
169 /// information is used to populate debug_inlined section.
170 typedef std::pair<unsigned, DIE *> InlineInfoLabels;
171 DenseMap<MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
172 SmallVector<MDNode *, 4> InlinedSPNodes;
174 /// CompileUnitOffsets - A vector of the offsets of the compile units. This is
175 /// used when calculating the "origin" of a concrete instance of an inlined
177 DenseMap<CompileUnit *, unsigned> CompileUnitOffsets;
179 /// DebugTimer - Timer for the Dwarf debug writer.
182 struct FunctionDebugFrameInfo {
184 std::vector<MachineMove> Moves;
186 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
187 : Number(Num), Moves(M) {}
190 std::vector<FunctionDebugFrameInfo> DebugFrames;
192 /// getSourceDirectoryAndFileIds - Return the directory and file ids that
193 /// maps to the source id. Source id starts at 1.
194 std::pair<unsigned, unsigned>
195 getSourceDirectoryAndFileIds(unsigned SId) const {
196 return SourceIds[SId-1];
199 /// getNumSourceDirectories - Return the number of source directories in the
201 unsigned getNumSourceDirectories() const {
202 return DirectoryNames.size();
205 /// getSourceDirectoryName - Return the name of the directory corresponding
207 const std::string &getSourceDirectoryName(unsigned Id) const {
208 return DirectoryNames[Id - 1];
211 /// getSourceFileName - Return the name of the source file corresponding
213 const std::string &getSourceFileName(unsigned Id) const {
214 return SourceFileNames[Id - 1];
217 /// getNumSourceIds - Return the number of unique source ids.
218 unsigned getNumSourceIds() const {
219 return SourceIds.size();
222 /// assignAbbrevNumber - Define a unique number for the abbreviation.
224 void assignAbbrevNumber(DIEAbbrev &Abbrev);
226 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
227 /// information entry.
228 DIEEntry *createDIEEntry(DIE *Entry = NULL);
230 /// addUInt - Add an unsigned integer attribute data and value.
232 void addUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
234 /// addSInt - Add an signed integer attribute data and value.
236 void addSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);
238 /// addString - Add a string attribute data and value.
240 void addString(DIE *Die, unsigned Attribute, unsigned Form,
241 const StringRef Str);
243 /// addLabel - Add a Dwarf label attribute data and value.
245 void addLabel(DIE *Die, unsigned Attribute, unsigned Form,
246 const MCSymbol *Label);
248 /// addSectionOffset - Add a section offset label attribute data and value.
250 void addSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
251 const MCSymbol *Label, const MCSymbol *Section,
254 /// addDelta - Add a label delta attribute data and value.
256 void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
257 const MCSymbol *Hi, const MCSymbol *Lo);
259 /// addDIEEntry - Add a DIE attribute data and value.
261 void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
262 Die->addValue(Attribute, Form, createDIEEntry(Entry));
265 /// addBlock - Add block data.
267 void addBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
269 /// addSourceLine - Add location information to specified debug information
271 void addSourceLine(DIE *Die, const DIVariable *V);
272 void addSourceLine(DIE *Die, const DIGlobal *G);
273 void addSourceLine(DIE *Die, const DISubprogram *SP);
274 void addSourceLine(DIE *Die, const DIType *Ty);
275 void addSourceLine(DIE *Die, const DINameSpace *NS);
277 /// addAddress - Add an address attribute to a die based on the location
279 void addAddress(DIE *Die, unsigned Attribute,
280 const MachineLocation &Location);
282 /// addComplexAddress - Start with the address based on the location provided,
283 /// and generate the DWARF information necessary to find the actual variable
284 /// (navigating the extra location information encoded in the type) based on
285 /// the starting location. Add the DWARF information to the die.
287 void addComplexAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
288 const MachineLocation &Location);
290 // FIXME: Should be reformulated in terms of addComplexAddress.
291 /// addBlockByrefAddress - Start with the address based on the location
292 /// provided, and generate the DWARF information necessary to find the
293 /// actual Block variable (navigating the Block struct) based on the
294 /// starting location. Add the DWARF information to the die. Obsolete,
295 /// please use addComplexAddress instead.
297 void addBlockByrefAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
298 const MachineLocation &Location);
300 /// addToContextOwner - Add Die into the list of its context owner's children.
301 void addToContextOwner(DIE *Die, DIDescriptor Context);
303 /// addType - Add a new type attribute to the specified entity.
304 void addType(DIE *Entity, DIType Ty);
307 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
308 DIE *getOrCreateNameSpace(DINameSpace NS);
310 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
312 DIE *getOrCreateTypeDIE(DIType Ty);
314 void addPubTypes(DISubprogram SP);
316 /// constructTypeDIE - Construct basic type die from DIBasicType.
317 void constructTypeDIE(DIE &Buffer,
320 /// constructTypeDIE - Construct derived type die from DIDerivedType.
321 void constructTypeDIE(DIE &Buffer,
324 /// constructTypeDIE - Construct type DIE from DICompositeType.
325 void constructTypeDIE(DIE &Buffer,
326 DICompositeType CTy);
328 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
329 void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
331 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
332 void constructArrayTypeDIE(DIE &Buffer,
333 DICompositeType *CTy);
335 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
336 DIE *constructEnumTypeDIE(DIEnumerator ETy);
338 /// createGlobalVariableDIE - Create new DIE using GV.
339 DIE *createGlobalVariableDIE(const DIGlobalVariable &GV);
341 /// createMemberDIE - Create new member DIE.
342 DIE *createMemberDIE(const DIDerivedType &DT);
344 /// createSubprogramDIE - Create new DIE using SP.
345 DIE *createSubprogramDIE(const DISubprogram &SP, bool MakeDecl = false);
347 /// getUpdatedDbgScope - Find or create DbgScope assicated with
348 /// the instruction. Initialize scope and update scope hierarchy.
349 DbgScope *getUpdatedDbgScope(MDNode *N, const MachineInstr *MI, MDNode *InlinedAt);
351 /// createDbgScope - Create DbgScope for the scope.
352 void createDbgScope(MDNode *Scope, MDNode *InlinedAt);
354 DbgScope *getOrCreateAbstractScope(MDNode *N);
356 /// findAbstractVariable - Find abstract variable associated with Var.
357 DbgVariable *findAbstractVariable(DIVariable &Var, unsigned FrameIdx,
360 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
361 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
362 /// If there are global variables in this scope then create and insert
363 /// DIEs for these variables.
364 DIE *updateSubprogramScopeDIE(MDNode *SPNode);
366 /// constructLexicalScope - Construct new DW_TAG_lexical_block
367 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
368 DIE *constructLexicalScopeDIE(DbgScope *Scope);
370 /// constructInlinedScopeDIE - This scope represents inlined body of
371 /// a function. Construct DIE to represent this concrete inlined copy
373 DIE *constructInlinedScopeDIE(DbgScope *Scope);
375 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
376 DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
378 /// constructScopeDIE - Construct a DIE for this scope.
379 DIE *constructScopeDIE(DbgScope *Scope);
381 /// emitInitial - Emit initial Dwarf declarations. This is necessary for cc
382 /// tools to recognize the object file contains Dwarf information.
385 /// emitDIE - Recusively Emits a debug information entry.
387 void emitDIE(DIE *Die);
389 /// computeSizeAndOffset - Compute the size and offset of a DIE.
391 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
393 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
395 void computeSizeAndOffsets();
397 /// EmitDebugInfo - Emit the debug info section.
399 void emitDebugInfo();
401 /// emitAbbreviations - Emit the abbreviation section.
403 void emitAbbreviations() const;
405 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
408 void emitEndOfLineMatrix(unsigned SectionEnd);
410 /// emitDebugLines - Emit source line information.
412 void emitDebugLines();
414 /// emitCommonDebugFrame - Emit common frame info into a debug frame section.
416 void emitCommonDebugFrame();
418 /// emitFunctionDebugFrame - Emit per function frame info into a debug frame
420 void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
422 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
424 void emitDebugPubNames();
426 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
428 void emitDebugPubTypes();
430 /// emitDebugStr - Emit visible names into a debug str section.
434 /// emitDebugLoc - Emit visible names into a debug loc section.
438 /// EmitDebugARanges - Emit visible names into a debug aranges section.
440 void EmitDebugARanges();
442 /// emitDebugRanges - Emit visible names into a debug ranges section.
444 void emitDebugRanges();
446 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
448 void emitDebugMacInfo();
450 /// emitDebugInlineInfo - Emit inline info using following format.
452 /// 1. length of section
453 /// 2. Dwarf version number
456 /// Entries (one "entry" for each function that was inlined):
458 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
459 /// otherwise offset into __debug_str for regular function name.
460 /// 2. offset into __debug_str section for regular function name.
461 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
462 /// instances for the function.
464 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
465 /// inlined instance; the die_offset points to the inlined_subroutine die in
466 /// the __debug_info section, and the low_pc is the starting address for the
467 /// inlining instance.
468 void emitDebugInlineInfo();
470 /// GetOrCreateSourceID - Look up the source id with the given directory and
471 /// source file names. If none currently exists, create a new id and insert it
472 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
474 unsigned GetOrCreateSourceID(StringRef DirName, StringRef FileName);
476 CompileUnit *constructCompileUnit(MDNode *N);
478 void constructGlobalVariableDIE(MDNode *N);
480 void constructSubprogramDIE(MDNode *N);
482 // FIXME: This should go away in favor of complex addresses.
483 /// Find the type the programmer originally declared the variable to be
484 /// and return that type. Obsolete, use GetComplexAddrType instead.
486 DIType getBlockByrefType(DIType Ty, std::string Name);
489 //===--------------------------------------------------------------------===//
490 // Main entry points.
492 DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T);
493 virtual ~DwarfDebug();
495 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
497 bool ShouldEmitDwarfDebug() const { return shouldEmit; }
499 /// beginModule - Emit all Dwarf sections that should come prior to the
501 void beginModule(Module *M, MachineModuleInfo *MMI);
503 /// endModule - Emit all Dwarf sections that should come after the content.
507 /// beginFunction - Gather pre-function debug information. Assumes being
508 /// emitted immediately after the function entry point.
509 void beginFunction(const MachineFunction *MF);
511 /// endFunction - Gather and emit post-function debug information.
513 void endFunction(const MachineFunction *MF);
515 /// recordSourceLine - Records location information and associates it with a
516 /// label. Returns a unique label ID used to generate a label and provide
517 /// correspondence to the source line list.
518 unsigned recordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
520 /// getSourceLineCount - Return the number of source lines in the debug
522 unsigned getSourceLineCount() const {
526 /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
527 /// timed. Look up the source id with the given directory and source file
528 /// names. If none currently exists, create a new id and insert it in the
529 /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
531 unsigned getOrCreateSourceID(const std::string &DirName,
532 const std::string &FileName);
534 /// extractScopeInformation - Scan machine instructions in this function
535 /// and collect DbgScopes. Return true, if atleast one scope was found.
536 bool extractScopeInformation();
538 /// collectVariableInfo - Populate DbgScope entries with variables' info.
539 void collectVariableInfo();
541 /// beginScope - Process beginning of a scope starting at Label.
542 void beginScope(const MachineInstr *MI, unsigned Label);
544 /// endScope - Prcess end of a scope.
545 void endScope(const MachineInstr *MI);
547 } // End of namespace llvm