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/ValueMap.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 Dwarf {
61 //===--------------------------------------------------------------------===//
62 // Attributes used to construct specific Dwarf sections.
65 /// CompileUnitMap - A map of global variables representing compile units to
67 DenseMap<Value *, CompileUnit *> CompileUnitMap;
69 /// CompileUnits - All the compile units in this module.
71 SmallVector<CompileUnit *, 8> CompileUnits;
73 /// ModuleCU - All DIEs are inserted in ModuleCU.
74 CompileUnit *ModuleCU;
76 /// AbbreviationsSet - Used to uniquely define abbreviations.
78 FoldingSet<DIEAbbrev> AbbreviationsSet;
80 /// Abbreviations - A list of all the unique abbreviations in use.
82 std::vector<DIEAbbrev *> Abbreviations;
84 /// DirectoryIdMap - Directory name to directory id map.
86 StringMap<unsigned> DirectoryIdMap;
88 /// DirectoryNames - A list of directory names.
89 SmallVector<std::string, 8> DirectoryNames;
91 /// SourceFileIdMap - Source file name to source file id map.
93 StringMap<unsigned> SourceFileIdMap;
95 /// SourceFileNames - A list of source file names.
96 SmallVector<std::string, 8> SourceFileNames;
98 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
99 /// id mapped to a unique id.
100 DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
102 /// SourceIds - Reverse map from source id to directory id + file id pair.
104 SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
106 /// Lines - List of of source line correspondence.
107 std::vector<SrcLineInfo> Lines;
109 /// DIEValues - A list of all the unique values in use.
111 std::vector<DIEValue *> DIEValues;
113 /// StringPool - A UniqueVector of strings used by indirect references.
115 UniqueVector<std::string> StringPool;
117 /// SectionMap - Provides a unique id per text section.
119 UniqueVector<const MCSection*> SectionMap;
121 /// SectionSourceLines - Tracks line numbers per text section.
123 std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
125 /// didInitial - Flag to indicate if initial emission has been done.
129 /// shouldEmit - Flag to indicate if debug information should be emitted.
133 // CurrentFnDbgScope - Top level scope for the current function.
135 DbgScope *CurrentFnDbgScope;
137 /// DbgScopeMap - Tracks the scopes in the current function.
139 ValueMap<MDNode *, DbgScope *> DbgScopeMap;
141 /// ConcreteScopes - Tracks the concrete scopees in the current function.
142 /// These scopes are also included in DbgScopeMap.
143 ValueMap<MDNode *, DbgScope *> ConcreteScopes;
145 /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
146 /// not included DbgScopeMap.
147 ValueMap<MDNode *, DbgScope *> AbstractScopes;
148 SmallVector<DbgScope *, 4>AbstractScopesList;
150 /// AbstractVariables - Collection on abstract variables.
151 ValueMap<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 /// AbstractSubprogramDIEs - Collection of abstruct subprogram DIEs.
158 SmallPtrSet<DIE *, 4> AbstractSubprogramDIEs;
160 /// ScopedGVs - Tracks global variables that are not at file scope.
161 /// For example void f() { static int b = 42; }
162 SmallVector<WeakVH, 4> ScopedGVs;
164 typedef SmallVector<DbgScope *, 2> ScopeVector;
165 typedef DenseMap<const MachineInstr *, ScopeVector>
168 /// DbgScopeBeginMap - Maps instruction with a list of DbgScopes it starts.
169 InsnToDbgScopeMapTy DbgScopeBeginMap;
171 /// DbgScopeEndMap - Maps instruction with a list DbgScopes it ends.
172 InsnToDbgScopeMapTy DbgScopeEndMap;
174 /// InlineInfo - Keep track of inlined functions and their location. This
175 /// information is used to populate debug_inlined section.
176 typedef std::pair<unsigned, DIE *> InlineInfoLabels;
177 ValueMap<MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
178 SmallVector<MDNode *, 4> InlinedSPNodes;
180 /// CompileUnitOffsets - A vector of the offsets of the compile units. This is
181 /// used when calculating the "origin" of a concrete instance of an inlined
183 DenseMap<CompileUnit *, unsigned> CompileUnitOffsets;
185 /// DebugTimer - Timer for the Dwarf debug writer.
188 struct FunctionDebugFrameInfo {
190 std::vector<MachineMove> Moves;
192 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
193 : Number(Num), Moves(M) {}
196 std::vector<FunctionDebugFrameInfo> DebugFrames;
198 /// getSourceDirectoryAndFileIds - Return the directory and file ids that
199 /// maps to the source id. Source id starts at 1.
200 std::pair<unsigned, unsigned>
201 getSourceDirectoryAndFileIds(unsigned SId) const {
202 return SourceIds[SId-1];
205 /// getNumSourceDirectories - Return the number of source directories in the
207 unsigned getNumSourceDirectories() const {
208 return DirectoryNames.size();
211 /// getSourceDirectoryName - Return the name of the directory corresponding
213 const std::string &getSourceDirectoryName(unsigned Id) const {
214 return DirectoryNames[Id - 1];
217 /// getSourceFileName - Return the name of the source file corresponding
219 const std::string &getSourceFileName(unsigned Id) const {
220 return SourceFileNames[Id - 1];
223 /// getNumSourceIds - Return the number of unique source ids.
224 unsigned getNumSourceIds() const {
225 return SourceIds.size();
228 /// assignAbbrevNumber - Define a unique number for the abbreviation.
230 void assignAbbrevNumber(DIEAbbrev &Abbrev);
232 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
233 /// information entry.
234 DIEEntry *createDIEEntry(DIE *Entry = NULL);
236 /// addUInt - Add an unsigned integer attribute data and value.
238 void addUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
240 /// addSInt - Add an signed integer attribute data and value.
242 void addSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);
244 /// addString - Add a string attribute data and value.
246 void addString(DIE *Die, unsigned Attribute, unsigned Form,
247 const StringRef Str);
249 /// addLabel - Add a Dwarf label attribute data and value.
251 void addLabel(DIE *Die, unsigned Attribute, unsigned Form,
252 const DWLabel &Label);
254 /// addObjectLabel - Add an non-Dwarf label attribute data and value.
256 void addObjectLabel(DIE *Die, unsigned Attribute, unsigned Form,
257 const std::string &Label);
259 /// addSectionOffset - Add a section offset label attribute data and value.
261 void addSectionOffset(DIE *Die, unsigned Attribute, unsigned Form,
262 const DWLabel &Label, const DWLabel &Section,
263 bool isEH = false, bool useSet = true);
265 /// addDelta - Add a label delta attribute data and value.
267 void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
268 const DWLabel &Hi, const DWLabel &Lo);
270 /// addDIEEntry - Add a DIE attribute data and value.
272 void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry) {
273 Die->addValue(Attribute, Form, createDIEEntry(Entry));
276 /// addBlock - Add block data.
278 void addBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
280 /// addSourceLine - Add location information to specified debug information
282 void addSourceLine(DIE *Die, const DIVariable *V);
283 void addSourceLine(DIE *Die, const DIGlobal *G);
284 void addSourceLine(DIE *Die, const DISubprogram *SP);
285 void addSourceLine(DIE *Die, const DIType *Ty);
287 /// addAddress - Add an address attribute to a die based on the location
289 void addAddress(DIE *Die, unsigned Attribute,
290 const MachineLocation &Location);
292 /// addComplexAddress - Start with the address based on the location provided,
293 /// and generate the DWARF information necessary to find the actual variable
294 /// (navigating the extra location information encoded in the type) based on
295 /// the starting location. Add the DWARF information to the die.
297 void addComplexAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
298 const MachineLocation &Location);
300 // FIXME: Should be reformulated in terms of addComplexAddress.
301 /// addBlockByrefAddress - Start with the address based on the location
302 /// provided, and generate the DWARF information necessary to find the
303 /// actual Block variable (navigating the Block struct) based on the
304 /// starting location. Add the DWARF information to the die. Obsolete,
305 /// please use addComplexAddress instead.
307 void addBlockByrefAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
308 const MachineLocation &Location);
310 /// addType - Add a new type attribute to the specified entity.
311 void addType(CompileUnit *DW_Unit, DIE *Entity, DIType Ty);
313 void addPubTypes(DISubprogram SP);
315 /// constructTypeDIE - Construct basic type die from DIBasicType.
316 void constructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
319 /// constructTypeDIE - Construct derived type die from DIDerivedType.
320 void constructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
323 /// constructTypeDIE - Construct type DIE from DICompositeType.
324 void constructTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
325 DICompositeType CTy);
327 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
328 void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
330 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
331 void constructArrayTypeDIE(CompileUnit *DW_Unit, DIE &Buffer,
332 DICompositeType *CTy);
334 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
335 DIE *constructEnumTypeDIE(CompileUnit *DW_Unit, DIEnumerator *ETy);
337 /// createGlobalVariableDIE - Create new DIE using GV.
338 DIE *createGlobalVariableDIE(CompileUnit *DW_Unit,
339 const DIGlobalVariable &GV);
341 /// createMemberDIE - Create new member DIE.
342 DIE *createMemberDIE(CompileUnit *DW_Unit, const DIDerivedType &DT);
344 /// createSubprogramDIE - Create new DIE using SP.
345 DIE *createSubprogramDIE(CompileUnit *DW_Unit,
346 const DISubprogram &SP,
347 bool IsConstructor = false,
348 bool IsInlined = false);
350 /// findCompileUnit - Get the compile unit for the given descriptor.
352 CompileUnit &findCompileUnit(DICompileUnit Unit) const;
354 /// createDbgScopeVariable - Create a new scope variable.
356 DIE *createDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit);
358 /// getUpdatedDbgScope - Find or create DbgScope assicated with
359 /// the instruction. Initialize scope and update scope hierarchy.
360 DbgScope *getUpdatedDbgScope(MDNode *N, const MachineInstr *MI, MDNode *InlinedAt);
362 /// createDbgScope - Create DbgScope for the scope.
363 void createDbgScope(MDNode *Scope, MDNode *InlinedAt);
365 DbgScope *getOrCreateAbstractScope(MDNode *N);
367 /// findAbstractVariable - Find abstract variable associated with Var.
368 DbgVariable *findAbstractVariable(DIVariable &Var, unsigned FrameIdx,
371 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
372 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
373 /// If there are global variables in this scope then create and insert
374 /// DIEs for these variables.
375 DIE *updateSubprogramScopeDIE(MDNode *SPNode);
377 /// constructLexicalScope - Construct new DW_TAG_lexical_block
378 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
379 DIE *constructLexicalScopeDIE(DbgScope *Scope);
381 /// constructInlinedScopeDIE - This scope represents inlined body of
382 /// a function. Construct DIE to represent this concrete inlined copy
384 DIE *constructInlinedScopeDIE(DbgScope *Scope);
386 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
387 DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S, CompileUnit *Unit);
389 /// constructScopeDIE - Construct a DIE for this scope.
390 DIE *constructScopeDIE(DbgScope *Scope);
392 /// emitInitial - Emit initial Dwarf declarations. This is necessary for cc
393 /// tools to recognize the object file contains Dwarf information.
396 /// emitDIE - Recusively Emits a debug information entry.
398 void emitDIE(DIE *Die);
400 /// computeSizeAndOffset - Compute the size and offset of a DIE.
402 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
404 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
406 void computeSizeAndOffsets();
408 /// EmitDebugInfo / emitDebugInfoPerCU - Emit the debug info section.
410 void emitDebugInfoPerCU(CompileUnit *Unit);
412 void emitDebugInfo();
414 /// emitAbbreviations - Emit the abbreviation section.
416 void emitAbbreviations() const;
418 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
421 void emitEndOfLineMatrix(unsigned SectionEnd);
423 /// emitDebugLines - Emit source line information.
425 void emitDebugLines();
427 /// emitCommonDebugFrame - Emit common frame info into a debug frame section.
429 void emitCommonDebugFrame();
431 /// emitFunctionDebugFrame - Emit per function frame info into a debug frame
433 void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
435 void emitDebugPubNamesPerCU(CompileUnit *Unit);
437 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
439 void emitDebugPubNames();
441 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
443 void emitDebugPubTypes();
445 /// emitDebugStr - Emit visible names into a debug str section.
449 /// emitDebugLoc - Emit visible names into a debug loc section.
453 /// EmitDebugARanges - Emit visible names into a debug aranges section.
455 void EmitDebugARanges();
457 /// emitDebugRanges - Emit visible names into a debug ranges section.
459 void emitDebugRanges();
461 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
463 void emitDebugMacInfo();
465 /// emitDebugInlineInfo - Emit inline info using following format.
467 /// 1. length of section
468 /// 2. Dwarf version number
471 /// Entries (one "entry" for each function that was inlined):
473 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
474 /// otherwise offset into __debug_str for regular function name.
475 /// 2. offset into __debug_str section for regular function name.
476 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
477 /// instances for the function.
479 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
480 /// inlined instance; the die_offset points to the inlined_subroutine die in
481 /// the __debug_info section, and the low_pc is the starting address for the
482 /// inlining instance.
483 void emitDebugInlineInfo();
485 /// GetOrCreateSourceID - Look up the source id with the given directory and
486 /// source file names. If none currently exists, create a new id and insert it
487 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames maps
489 unsigned GetOrCreateSourceID(const char *DirName,
490 const char *FileName);
492 void constructCompileUnit(MDNode *N);
494 void constructGlobalVariableDIE(MDNode *N);
496 void constructSubprogramDIE(MDNode *N);
498 // FIXME: This should go away in favor of complex addresses.
499 /// Find the type the programmer originally declared the variable to be
500 /// and return that type. Obsolete, use GetComplexAddrType instead.
502 DIType getBlockByrefType(DIType Ty, std::string Name);
505 //===--------------------------------------------------------------------===//
506 // Main entry points.
508 DwarfDebug(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T);
509 virtual ~DwarfDebug();
511 /// ShouldEmitDwarfDebug - Returns true if Dwarf debugging declarations should
513 bool ShouldEmitDwarfDebug() const { return shouldEmit; }
515 /// beginModule - Emit all Dwarf sections that should come prior to the
517 void beginModule(Module *M, MachineModuleInfo *MMI);
519 /// endModule - Emit all Dwarf sections that should come after the content.
523 /// beginFunction - Gather pre-function debug information. Assumes being
524 /// emitted immediately after the function entry point.
525 void beginFunction(MachineFunction *MF);
527 /// endFunction - Gather and emit post-function debug information.
529 void endFunction(MachineFunction *MF);
531 /// recordSourceLine - Records location information and associates it with a
532 /// label. Returns a unique label ID used to generate a label and provide
533 /// correspondence to the source line list.
534 unsigned recordSourceLine(unsigned Line, unsigned Col, MDNode *Scope);
536 /// getSourceLineCount - Return the number of source lines in the debug
538 unsigned getSourceLineCount() const {
542 /// getOrCreateSourceID - Public version of GetOrCreateSourceID. This can be
543 /// timed. Look up the source id with the given directory and source file
544 /// names. If none currently exists, create a new id and insert it in the
545 /// SourceIds map. This can update DirectoryNames and SourceFileNames maps as
547 unsigned getOrCreateSourceID(const std::string &DirName,
548 const std::string &FileName);
550 /// extractScopeInformation - Scan machine instructions in this function
551 /// and collect DbgScopes. Return true, if atleast one scope was found.
552 bool extractScopeInformation(MachineFunction *MF);
554 /// collectVariableInfo - Populate DbgScope entries with variables' info.
555 void collectVariableInfo();
557 /// beginScope - Process beginning of a scope starting at Label.
558 void beginScope(const MachineInstr *MI, unsigned Label);
560 /// endScope - Prcess end of a scope.
561 void endScope(const MachineInstr *MI);
563 } // End of namespace llvm