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 DWLabel &Label);
248 /// addObjectLabel - Add an non-Dwarf label attribute data and value.
250 void addObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
251 const MCSymbol *Sym);
253 /// addSectionOffset - Add a section offset label attribute data and value.
255 void addSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
256 const DWLabel &Label, const DWLabel &Section,
257 bool isEH = false, bool useSet = true);
259 /// addDelta - Add a label delta attribute data and value.
261 void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
262 const DWLabel &Hi, const DWLabel &Lo);
264 /// addDIEEntry - Add a DIE attribute data and value.
266 void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
267 Die->addValue(Attribute, Form, createDIEEntry(Entry));
270 /// addBlock - Add block data.
272 void addBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
274 /// addSourceLine - Add location information to specified debug information
276 void addSourceLine(DIE *Die, const DIVariable *V);
277 void addSourceLine(DIE *Die, const DIGlobal *G);
278 void addSourceLine(DIE *Die, const DISubprogram *SP);
279 void addSourceLine(DIE *Die, const DIType *Ty);
280 void addSourceLine(DIE *Die, const DINameSpace *NS);
282 /// addAddress - Add an address attribute to a die based on the location
284 void addAddress(DIE *Die, unsigned Attribute,
285 const MachineLocation &Location);
287 /// addComplexAddress - Start with the address based on the location provided,
288 /// and generate the DWARF information necessary to find the actual variable
289 /// (navigating the extra location information encoded in the type) based on
290 /// the starting location. Add the DWARF information to the die.
292 void addComplexAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
293 const MachineLocation &Location);
295 // FIXME: Should be reformulated in terms of addComplexAddress.
296 /// addBlockByrefAddress - Start with the address based on the location
297 /// provided, and generate the DWARF information necessary to find the
298 /// actual Block variable (navigating the Block struct) based on the
299 /// starting location. Add the DWARF information to the die. Obsolete,
300 /// please use addComplexAddress instead.
302 void addBlockByrefAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
303 const MachineLocation &Location);
305 /// addToContextOwner - Add Die into the list of its context owner's children.
306 void addToContextOwner(DIE *Die, DIDescriptor Context);
308 /// addType - Add a new type attribute to the specified entity.
309 void addType(DIE *Entity, DIType Ty);
312 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
313 DIE *getOrCreateNameSpace(DINameSpace NS);
315 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
317 DIE *getOrCreateTypeDIE(DIType Ty);
319 void addPubTypes(DISubprogram SP);
321 /// constructTypeDIE - Construct basic type die from DIBasicType.
322 void constructTypeDIE(DIE &Buffer,
325 /// constructTypeDIE - Construct derived type die from DIDerivedType.
326 void constructTypeDIE(DIE &Buffer,
329 /// constructTypeDIE - Construct type DIE from DICompositeType.
330 void constructTypeDIE(DIE &Buffer,
331 DICompositeType CTy);
333 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
334 void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
336 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
337 void constructArrayTypeDIE(DIE &Buffer,
338 DICompositeType *CTy);
340 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
341 DIE *constructEnumTypeDIE(DIEnumerator ETy);
343 /// createGlobalVariableDIE - Create new DIE using GV.
344 DIE *createGlobalVariableDIE(const DIGlobalVariable &GV);
346 /// createMemberDIE - Create new member DIE.
347 DIE *createMemberDIE(const DIDerivedType &DT);
349 /// createSubprogramDIE - Create new DIE using SP.
350 DIE *createSubprogramDIE(const DISubprogram &SP, bool MakeDecl = false);
352 /// getUpdatedDbgScope - Find or create DbgScope assicated with
353 /// the instruction. Initialize scope and update scope hierarchy.
354 DbgScope *getUpdatedDbgScope(MDNode *N, const MachineInstr *MI, MDNode *InlinedAt);
356 /// createDbgScope - Create DbgScope for the scope.
357 void createDbgScope(MDNode *Scope, MDNode *InlinedAt);
359 DbgScope *getOrCreateAbstractScope(MDNode *N);
361 /// findAbstractVariable - Find abstract variable associated with Var.
362 DbgVariable *findAbstractVariable(DIVariable &Var, unsigned FrameIdx,
365 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
366 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
367 /// If there are global variables in this scope then create and insert
368 /// DIEs for these variables.
369 DIE *updateSubprogramScopeDIE(MDNode *SPNode);
371 /// constructLexicalScope - Construct new DW_TAG_lexical_block
372 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
373 DIE *constructLexicalScopeDIE(DbgScope *Scope);
375 /// constructInlinedScopeDIE - This scope represents inlined body of
376 /// a function. Construct DIE to represent this concrete inlined copy
378 DIE *constructInlinedScopeDIE(DbgScope *Scope);
380 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
381 DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
383 /// constructScopeDIE - Construct a DIE for this scope.
384 DIE *constructScopeDIE(DbgScope *Scope);
386 /// emitInitial - Emit initial Dwarf declarations. This is necessary for cc
387 /// tools to recognize the object file contains Dwarf information.
390 /// emitDIE - Recusively Emits a debug information entry.
392 void emitDIE(DIE *Die);
394 /// computeSizeAndOffset - Compute the size and offset of a DIE.
396 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
398 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
400 void computeSizeAndOffsets();
402 /// EmitDebugInfo - Emit the debug info section.
404 void emitDebugInfo();
406 /// emitAbbreviations - Emit the abbreviation section.
408 void emitAbbreviations() const;
410 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
413 void emitEndOfLineMatrix(unsigned SectionEnd);
415 /// emitDebugLines - Emit source line information.
417 void emitDebugLines();
419 /// emitCommonDebugFrame - Emit common frame info into a debug frame section.
421 void emitCommonDebugFrame();
423 /// emitFunctionDebugFrame - Emit per function frame info into a debug frame
425 void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
427 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
429 void emitDebugPubNames();
431 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
433 void emitDebugPubTypes();
435 /// emitDebugStr - Emit visible names into a debug str section.
439 /// emitDebugLoc - Emit visible names into a debug loc section.
443 /// EmitDebugARanges - Emit visible names into a debug aranges section.
445 void EmitDebugARanges();
447 /// emitDebugRanges - Emit visible names into a debug ranges section.
449 void emitDebugRanges();
451 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
453 void emitDebugMacInfo();
455 /// emitDebugInlineInfo - Emit inline info using following format.
457 /// 1. length of section
458 /// 2. Dwarf version number
461 /// Entries (one "entry" for each function that was inlined):
463 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
464 /// otherwise offset into __debug_str for regular function name.
465 /// 2. offset into __debug_str section for regular function name.
466 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
467 /// instances for the function.
469 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
470 /// inlined instance; the die_offset points to the inlined_subroutine die in
471 /// the __debug_info section, and the low_pc is the starting address for the
472 /// inlining instance.
473 void emitDebugInlineInfo();
475 /// GetOrCreateSourceID - Look up the source id with the given directory and
476 /// source file names. If none currently exists, create a new id and insert it
477 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
479 unsigned GetOrCreateSourceID(StringRef DirName, StringRef FileName);
481 CompileUnit *constructCompileUnit(MDNode *N);
483 void constructGlobalVariableDIE(MDNode *N);
485 void constructSubprogramDIE(MDNode *N);
487 // FIXME: This should go away in favor of complex addresses.
488 /// Find the type the programmer originally declared the variable to be
489 /// and return that type. Obsolete, use GetComplexAddrType instead.
491 DIType getBlockByrefType(DIType Ty, std::string Name);
494 //===--------------------------------------------------------------------===//
495 // Main entry points.
497 DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T);
498 virtual ~DwarfDebug();
500 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
502 bool ShouldEmitDwarfDebug() const { return shouldEmit; }
504 /// beginModule - Emit all Dwarf sections that should come prior to the
506 void beginModule(Module *M, MachineModuleInfo *MMI);
508 /// endModule - Emit all Dwarf sections that should come after the content.
512 /// beginFunction - Gather pre-function debug information. Assumes being
513 /// emitted immediately after the function entry point.
514 void beginFunction(const MachineFunction *MF);
516 /// endFunction - Gather and emit post-function debug information.
518 void endFunction(const MachineFunction *MF);
520 /// recordSourceLine - Records location information and associates it with a
521 /// label. Returns a unique label ID used to generate a label and provide
522 /// correspondence to the source line list.
523 unsigned recordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
525 /// getSourceLineCount - Return the number of source lines in the debug
527 unsigned getSourceLineCount() const {
531 /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
532 /// timed. Look up the source id with the given directory and source file
533 /// names. If none currently exists, create a new id and insert it in the
534 /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
536 unsigned getOrCreateSourceID(const std::string &DirName,
537 const std::string &FileName);
539 /// extractScopeInformation - Scan machine instructions in this function
540 /// and collect DbgScopes. Return true, if atleast one scope was found.
541 bool extractScopeInformation();
543 /// collectVariableInfo - Populate DbgScope entries with variables' info.
544 void collectVariableInfo();
546 /// beginScope - Process beginning of a scope starting at Label.
547 void beginScope(const MachineInstr *MI, unsigned Label);
549 /// endScope - Prcess end of a scope.
550 void endScope(const MachineInstr *MI);
552 } // End of namespace llvm