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__
17 #include "llvm/CodeGen/AsmPrinter.h"
18 #include "llvm/CodeGen/MachineLocation.h"
20 #include "llvm/ADT/DenseMap.h"
21 #include "llvm/ADT/FoldingSet.h"
22 #include "llvm/ADT/SmallPtrSet.h"
23 #include "llvm/ADT/StringMap.h"
24 #include "llvm/ADT/UniqueVector.h"
25 #include "llvm/Support/Allocator.h"
26 #include "llvm/Support/DebugLoc.h"
31 class DbgConcreteScope;
34 class MachineFrameInfo;
35 class MachineModuleInfo;
47 class DIGlobalVariable;
54 class DICompositeType;
56 //===----------------------------------------------------------------------===//
57 /// SrcLineInfo - This class is used to record source line correspondence.
60 unsigned Line; // Source line number.
61 unsigned Column; // Source column.
62 unsigned SourceID; // Source ID number.
63 MCSymbol *Label; // Label in code ID number.
65 SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label)
66 : Line(L), Column(C), SourceID(S), Label(label) {}
69 unsigned getLine() const { return Line; }
70 unsigned getColumn() const { return Column; }
71 unsigned getSourceID() const { return SourceID; }
72 MCSymbol *getLabel() const { return Label; }
76 /// Asm - Target of Dwarf emission.
79 /// MMI - Collected machine module information.
80 MachineModuleInfo *MMI;
82 //===--------------------------------------------------------------------===//
83 // Attributes used to construct specific Dwarf sections.
87 DenseMap <const MDNode *, CompileUnit *> CUMap;
89 /// AbbreviationsSet - Used to uniquely define abbreviations.
91 FoldingSet<DIEAbbrev> AbbreviationsSet;
93 /// Abbreviations - A list of all the unique abbreviations in use.
95 std::vector<DIEAbbrev *> Abbreviations;
97 /// DirectoryIdMap - Directory name to directory id map.
99 StringMap<unsigned> DirectoryIdMap;
101 /// DirectoryNames - A list of directory names.
102 SmallVector<std::string, 8> DirectoryNames;
104 /// SourceFileIdMap - Source file name to source file id map.
106 StringMap<unsigned> SourceFileIdMap;
108 /// SourceFileNames - A list of source file names.
109 SmallVector<std::string, 8> SourceFileNames;
111 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
112 /// id mapped to a unique id.
113 DenseMap<std::pair<unsigned, unsigned>, unsigned> SourceIdMap;
115 /// SourceIds - Reverse map from source id to directory id + file id pair.
117 SmallVector<std::pair<unsigned, unsigned>, 8> SourceIds;
119 /// Lines - List of source line correspondence.
120 std::vector<SrcLineInfo> Lines;
122 /// DIEBlocks - A list of all the DIEBlocks in use.
123 std::vector<DIEBlock *> DIEBlocks;
125 // DIEValueAllocator - All DIEValues are allocated through this allocator.
126 BumpPtrAllocator DIEValueAllocator;
128 /// StringPool - A String->Symbol mapping of strings used by indirect
130 StringMap<std::pair<MCSymbol*, unsigned> > StringPool;
131 unsigned NextStringPoolNumber;
133 MCSymbol *getStringPoolEntry(StringRef Str);
135 /// SectionMap - Provides a unique id per text section.
137 UniqueVector<const MCSection*> SectionMap;
139 /// SectionSourceLines - Tracks line numbers per text section.
141 std::vector<std::vector<SrcLineInfo> > SectionSourceLines;
143 // CurrentFnDbgScope - Top level scope for the current function.
145 DbgScope *CurrentFnDbgScope;
147 /// DbgScopeMap - Tracks the scopes in the current function. Owns the
148 /// contained DbgScope*s.
150 DenseMap<const MDNode *, DbgScope *> DbgScopeMap;
152 /// ConcreteScopes - Tracks the concrete scopees in the current function.
153 /// These scopes are also included in DbgScopeMap.
154 DenseMap<const MDNode *, DbgScope *> ConcreteScopes;
156 /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
157 /// not included DbgScopeMap. AbstractScopes owns its DbgScope*s.
158 DenseMap<const MDNode *, DbgScope *> AbstractScopes;
160 /// AbstractSPDies - Collection of abstract subprogram DIEs.
161 DenseMap<const MDNode *, DIE *> AbstractSPDies;
163 /// AbstractScopesList - Tracks abstract scopes constructed while processing
164 /// a function. This list is cleared during endFunction().
165 SmallVector<DbgScope *, 4>AbstractScopesList;
167 /// AbstractVariables - Collection on abstract variables. Owned by the
168 /// DbgScopes in AbstractScopes.
169 DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
171 /// DbgVariableToFrameIndexMap - Tracks frame index used to find
172 /// variable's value.
173 DenseMap<const DbgVariable *, int> DbgVariableToFrameIndexMap;
175 /// DbgVariableToDbgInstMap - Maps DbgVariable to corresponding DBG_VALUE
176 /// machine instruction.
177 DenseMap<const DbgVariable *, const MachineInstr *> DbgVariableToDbgInstMap;
179 /// DbgVariableLabelsMap - Maps DbgVariable to corresponding MCSymbol.
180 DenseMap<const DbgVariable *, const MCSymbol *> DbgVariableLabelsMap;
182 /// DotDebugLocEntry - This struct describes location entries emitted in
183 /// .debug_loc section.
184 typedef struct DotDebugLocEntry {
185 const MCSymbol *Begin;
188 DotDebugLocEntry() : Begin(0), End(0) {}
189 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E,
190 MachineLocation &L) : Begin(B), End(E), Loc(L) {}
191 /// Empty entries are also used as a trigger to emit temp label. Such
192 /// labels are referenced is used to find debug_loc offset for a given DIE.
193 bool isEmpty() { return Begin == 0 && End == 0; }
196 /// DotDebugLocEntries - Collection of DotDebugLocEntry.
197 SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries;
199 /// UseDotDebugLocEntry - DW_AT_location attributes for the DIEs in this set
200 /// idetifies corresponding .debug_loc entry offset.
201 SmallPtrSet<const DIE *, 4> UseDotDebugLocEntry;
203 /// VarToAbstractVarMap - Maps DbgVariable with corresponding Abstract
204 /// DbgVariable, if any.
205 DenseMap<const DbgVariable *, const DbgVariable *> VarToAbstractVarMap;
207 /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
208 /// (at the end of the module) as DW_AT_inline.
209 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
211 /// ContainingTypeMap - This map is used to keep track of subprogram DIEs that
212 /// need DW_AT_containing_type attribute. This attribute points to a DIE that
213 /// corresponds to the MDNode mapped with the subprogram DIE.
214 DenseMap<DIE *, const MDNode *> ContainingTypeMap;
216 typedef SmallVector<DbgScope *, 2> ScopeVector;
218 SmallPtrSet<const MachineInstr *, 8> InsnsEndScopeSet;
220 /// InlineInfo - Keep track of inlined functions and their location. This
221 /// information is used to populate debug_inlined section.
222 typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels;
223 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
224 SmallVector<const MDNode *, 4> InlinedSPNodes;
226 // ProcessedSPNodes - This is a collection of subprogram MDNodes that
227 // are processed to create DIEs.
228 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
230 /// LabelsBeforeInsn - Maps instruction with label emitted before
232 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
234 /// LabelsAfterInsn - Maps instruction with label emitted after
236 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
238 /// insnNeedsLabel - Collection of instructions that need a label to mark
239 /// a debuggging information entity.
240 SmallPtrSet<const MachineInstr *, 8> InsnNeedsLabel;
242 SmallVector<const MCSymbol *, 8> DebugRangeSymbols;
244 /// Previous instruction's location information. This is used to determine
245 /// label location to indicate scope boundries in dwarf debug info.
246 DebugLoc PrevInstLoc;
249 struct FunctionDebugFrameInfo {
251 std::vector<MachineMove> Moves;
253 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
254 : Number(Num), Moves(M) {}
257 std::vector<FunctionDebugFrameInfo> DebugFrames;
259 // Section Symbols: these are assembler temporary labels that are emitted at
260 // the beginning of each supported dwarf section. These are used to form
261 // section offsets and are created by EmitSectionLabels.
262 MCSymbol *DwarfFrameSectionSym, *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
263 MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
264 MCSymbol *DwarfDebugLocSectionSym;
265 MCSymbol *FunctionBeginSym, *FunctionEndSym;
267 DIEInteger *DIEIntegerOne;
270 /// getSourceDirectoryAndFileIds - Return the directory and file ids that
271 /// maps to the source id. Source id starts at 1.
272 std::pair<unsigned, unsigned>
273 getSourceDirectoryAndFileIds(unsigned SId) const {
274 return SourceIds[SId-1];
277 /// getNumSourceDirectories - Return the number of source directories in the
279 unsigned getNumSourceDirectories() const {
280 return DirectoryNames.size();
283 /// getSourceDirectoryName - Return the name of the directory corresponding
285 const std::string &getSourceDirectoryName(unsigned Id) const {
286 return DirectoryNames[Id - 1];
289 /// getSourceFileName - Return the name of the source file corresponding
291 const std::string &getSourceFileName(unsigned Id) const {
292 return SourceFileNames[Id - 1];
295 /// getNumSourceIds - Return the number of unique source ids.
296 unsigned getNumSourceIds() const {
297 return SourceIds.size();
300 /// assignAbbrevNumber - Define a unique number for the abbreviation.
302 void assignAbbrevNumber(DIEAbbrev &Abbrev);
304 /// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
305 /// information entry.
306 DIEEntry *createDIEEntry(DIE *Entry);
308 /// addUInt - Add an unsigned integer attribute data and value.
310 void addUInt(DIE *Die, unsigned Attribute, unsigned Form, uint64_t Integer);
312 /// addSInt - Add an signed integer attribute data and value.
314 void addSInt(DIE *Die, unsigned Attribute, unsigned Form, int64_t Integer);
316 /// addString - Add a string attribute data and value.
318 void addString(DIE *Die, unsigned Attribute, unsigned Form,
319 const StringRef Str);
321 /// addLabel - Add a Dwarf label attribute data and value.
323 void addLabel(DIE *Die, unsigned Attribute, unsigned Form,
324 const MCSymbol *Label);
326 /// addDelta - Add a label delta attribute data and value.
328 void addDelta(DIE *Die, unsigned Attribute, unsigned Form,
329 const MCSymbol *Hi, const MCSymbol *Lo);
331 /// addDIEEntry - Add a DIE attribute data and value.
333 void addDIEEntry(DIE *Die, unsigned Attribute, unsigned Form, DIE *Entry);
335 /// addBlock - Add block data.
337 void addBlock(DIE *Die, unsigned Attribute, unsigned Form, DIEBlock *Block);
339 /// addSourceLine - Add location information to specified debug information
341 void addSourceLine(DIE *Die, DIVariable V);
342 void addSourceLine(DIE *Die, DIGlobalVariable G);
343 void addSourceLine(DIE *Die, DISubprogram SP);
344 void addSourceLine(DIE *Die, DIType Ty);
345 void addSourceLine(DIE *Die, DINameSpace NS);
347 /// addAddress - Add an address attribute to a die based on the location
349 void addAddress(DIE *Die, unsigned Attribute,
350 const MachineLocation &Location);
352 /// addRegisterAddress - Add register location entry in variable DIE.
353 bool addRegisterAddress(DIE *Die, const MCSymbol *VS, const MachineOperand &MO);
355 /// addConstantValue - Add constant value entry in variable DIE.
356 bool addConstantValue(DIE *Die, const MCSymbol *VS, const MachineOperand &MO);
358 /// addConstantFPValue - Add constant value entry in variable DIE.
359 bool addConstantFPValue(DIE *Die, const MCSymbol *VS, const MachineOperand &MO);
361 /// addComplexAddress - Start with the address based on the location provided,
362 /// and generate the DWARF information necessary to find the actual variable
363 /// (navigating the extra location information encoded in the type) based on
364 /// the starting location. Add the DWARF information to the die.
366 void addComplexAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
367 const MachineLocation &Location);
369 // FIXME: Should be reformulated in terms of addComplexAddress.
370 /// addBlockByrefAddress - Start with the address based on the location
371 /// provided, and generate the DWARF information necessary to find the
372 /// actual Block variable (navigating the Block struct) based on the
373 /// starting location. Add the DWARF information to the die. Obsolete,
374 /// please use addComplexAddress instead.
376 void addBlockByrefAddress(DbgVariable *&DV, DIE *Die, unsigned Attribute,
377 const MachineLocation &Location);
379 /// addVariableAddress - Add DW_AT_location attribute for a DbgVariable based
380 /// on provided frame index.
381 void addVariableAddress(DbgVariable *&DV, DIE *Die, int64_t FI);
383 /// addToContextOwner - Add Die into the list of its context owner's children.
384 void addToContextOwner(DIE *Die, DIDescriptor Context);
386 /// addType - Add a new type attribute to the specified entity.
387 void addType(DIE *Entity, DIType Ty);
390 /// getOrCreateNameSpace - Create a DIE for DINameSpace.
391 DIE *getOrCreateNameSpace(DINameSpace NS);
393 /// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
395 DIE *getOrCreateTypeDIE(DIType Ty);
397 void addPubTypes(DISubprogram SP);
399 /// constructTypeDIE - Construct basic type die from DIBasicType.
400 void constructTypeDIE(DIE &Buffer,
403 /// constructTypeDIE - Construct derived type die from DIDerivedType.
404 void constructTypeDIE(DIE &Buffer,
407 /// constructTypeDIE - Construct type DIE from DICompositeType.
408 void constructTypeDIE(DIE &Buffer,
409 DICompositeType CTy);
411 /// constructSubrangeDIE - Construct subrange DIE from DISubrange.
412 void constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy);
414 /// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
415 void constructArrayTypeDIE(DIE &Buffer,
416 DICompositeType *CTy);
418 /// constructEnumTypeDIE - Construct enum type DIE from DIEnumerator.
419 DIE *constructEnumTypeDIE(DIEnumerator ETy);
421 /// createMemberDIE - Create new member DIE.
422 DIE *createMemberDIE(DIDerivedType DT);
424 /// createSubprogramDIE - Create new DIE using SP.
425 DIE *createSubprogramDIE(DISubprogram SP);
427 /// getOrCreateDbgScope - Create DbgScope for the scope.
428 DbgScope *getOrCreateDbgScope(const MDNode *Scope, const MDNode *InlinedAt);
430 DbgScope *getOrCreateAbstractScope(const MDNode *N);
432 /// findAbstractVariable - Find abstract variable associated with Var.
433 DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc Loc);
435 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
436 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
437 /// If there are global variables in this scope then create and insert
438 /// DIEs for these variables.
439 DIE *updateSubprogramScopeDIE(const MDNode *SPNode);
441 /// constructLexicalScope - Construct new DW_TAG_lexical_block
442 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
443 DIE *constructLexicalScopeDIE(DbgScope *Scope);
445 /// constructInlinedScopeDIE - This scope represents inlined body of
446 /// a function. Construct DIE to represent this concrete inlined copy
448 DIE *constructInlinedScopeDIE(DbgScope *Scope);
450 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
451 DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
453 /// constructScopeDIE - Construct a DIE for this scope.
454 DIE *constructScopeDIE(DbgScope *Scope);
456 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
457 /// the start of each one.
458 void EmitSectionLabels();
460 /// emitDIE - Recusively Emits a debug information entry.
462 void emitDIE(DIE *Die);
464 /// computeSizeAndOffset - Compute the size and offset of a DIE.
466 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
468 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
470 void computeSizeAndOffsets();
472 /// EmitDebugInfo - Emit the debug info section.
474 void emitDebugInfo();
476 /// emitAbbreviations - Emit the abbreviation section.
478 void emitAbbreviations() const;
480 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
483 void emitEndOfLineMatrix(unsigned SectionEnd);
485 /// emitDebugLines - Emit source line information.
487 void emitDebugLines();
489 /// emitCommonDebugFrame - Emit common frame info into a debug frame section.
491 void emitCommonDebugFrame();
493 /// emitFunctionDebugFrame - Emit per function frame info into a debug frame
495 void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
497 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
499 void emitDebugPubNames();
501 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
503 void emitDebugPubTypes();
505 /// emitDebugStr - Emit visible names into a debug str section.
509 /// emitDebugLoc - Emit visible names into a debug loc section.
513 /// EmitDebugARanges - Emit visible names into a debug aranges section.
515 void EmitDebugARanges();
517 /// emitDebugRanges - Emit visible names into a debug ranges section.
519 void emitDebugRanges();
521 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
523 void emitDebugMacInfo();
525 /// emitDebugInlineInfo - Emit inline info using following format.
527 /// 1. length of section
528 /// 2. Dwarf version number
531 /// Entries (one "entry" for each function that was inlined):
533 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
534 /// otherwise offset into __debug_str for regular function name.
535 /// 2. offset into __debug_str section for regular function name.
536 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
537 /// instances for the function.
539 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
540 /// inlined instance; the die_offset points to the inlined_subroutine die in
541 /// the __debug_info section, and the low_pc is the starting address for the
542 /// inlining instance.
543 void emitDebugInlineInfo();
545 /// GetOrCreateSourceID - Look up the source id with the given directory and
546 /// source file names. If none currently exists, create a new id and insert it
547 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames
549 unsigned GetOrCreateSourceID(StringRef DirName, StringRef FileName);
551 /// constructCompileUnit - Create new CompileUnit for the given
552 /// metadata node with tag DW_TAG_compile_unit.
553 void constructCompileUnit(const MDNode *N);
555 /// getCompielUnit - Get CompileUnit DIE.
556 CompileUnit *getCompileUnit(const MDNode *N) const;
558 /// constructGlobalVariableDIE - Construct global variable DIE.
559 void constructGlobalVariableDIE(const MDNode *N);
561 /// construct SubprogramDIE - Construct subprogram DIE.
562 void constructSubprogramDIE(const MDNode *N);
564 /// recordSourceLine - Register a source line with debug info. Returns the
565 /// unique label that was emitted and which provides correspondence to
566 /// the source line list.
567 MCSymbol *recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope);
569 /// getSourceLineCount - Return the number of source lines in the debug
571 unsigned getSourceLineCount() const {
575 /// recordVariableFrameIndex - Record a variable's index.
576 void recordVariableFrameIndex(const DbgVariable *V, int Index);
578 /// findVariableFrameIndex - Return true if frame index for the variable
579 /// is found. Update FI to hold value of the index.
580 bool findVariableFrameIndex(const DbgVariable *V, int *FI);
582 /// findVariableLabel - Find MCSymbol for the variable.
583 const MCSymbol *findVariableLabel(const DbgVariable *V);
585 /// findDbgScope - Find DbgScope for the debug loc attached with an
587 DbgScope *findDbgScope(const MachineInstr *MI);
589 /// identifyScopeMarkers() - Indentify instructions that are marking
590 /// beginning of or end of a scope.
591 void identifyScopeMarkers();
593 /// extractScopeInformation - Scan machine instructions in this function
594 /// and collect DbgScopes. Return true, if atleast one scope was found.
595 bool extractScopeInformation();
597 /// collectVariableInfo - Populate DbgScope entries with variables' info.
598 void collectVariableInfo(const MachineFunction *,
599 SmallPtrSet<const MDNode *, 16> &ProcessedVars);
601 /// collectVariableInfoFromMMITable - Collect variable information from
602 /// side table maintained by MMI.
603 void collectVariableInfoFromMMITable(const MachineFunction * MF,
604 SmallPtrSet<const MDNode *, 16> &P);
606 //===--------------------------------------------------------------------===//
607 // Main entry points.
609 DwarfDebug(AsmPrinter *A, Module *M);
612 /// beginModule - Emit all Dwarf sections that should come prior to the
614 void beginModule(Module *M);
616 /// endModule - Emit all Dwarf sections that should come after the content.
620 /// beginFunction - Gather pre-function debug information. Assumes being
621 /// emitted immediately after the function entry point.
622 void beginFunction(const MachineFunction *MF);
624 /// endFunction - Gather and emit post-function debug information.
626 void endFunction(const MachineFunction *MF);
628 /// getLabelBeforeInsn - Return Label preceding the instruction.
629 const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
631 /// getLabelAfterInsn - Return Label immediately following the instruction.
632 const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
634 /// beginInstruction - Process beginning of an instruction.
635 void beginInstruction(const MachineInstr *MI);
637 /// endInstruction - Prcess end of an instruction.
638 void endInstruction(const MachineInstr *MI);
640 } // End of namespace llvm