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/LexicalScopes.h"
19 #include "llvm/MC/MachineLocation.h"
20 #include "llvm/Analysis/DebugInfo.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/ADT/FoldingSet.h"
24 #include "llvm/ADT/SmallPtrSet.h"
25 #include "llvm/ADT/StringMap.h"
26 #include "llvm/ADT/UniqueVector.h"
27 #include "llvm/Support/Allocator.h"
28 #include "llvm/Support/DebugLoc.h"
33 class DbgConcreteScope;
35 class MachineFrameInfo;
36 class MachineModuleInfo;
44 //===----------------------------------------------------------------------===//
45 /// SrcLineInfo - This class is used to record source line correspondence.
48 unsigned Line; // Source line number.
49 unsigned Column; // Source column.
50 unsigned SourceID; // Source ID number.
51 MCSymbol *Label; // Label in code ID number.
53 SrcLineInfo(unsigned L, unsigned C, unsigned S, MCSymbol *label)
54 : Line(L), Column(C), SourceID(S), Label(label) {}
57 unsigned getLine() const { return Line; }
58 unsigned getColumn() const { return Column; }
59 unsigned getSourceID() const { return SourceID; }
60 MCSymbol *getLabel() const { return Label; }
63 /// DotDebugLocEntry - This struct describes location entries emitted in
64 /// .debug_loc section.
65 typedef struct DotDebugLocEntry {
66 const MCSymbol *Begin;
69 const MDNode *Variable;
78 enum EntryType EntryKind;
82 const ConstantFP *CFP;
83 const ConstantInt *CIP;
86 : Begin(0), End(0), Variable(0), Merged(false),
87 Constant(false) { Constants.Int = 0;}
88 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L,
90 : Begin(B), End(E), Loc(L), Variable(V), Merged(false),
91 Constant(false) { Constants.Int = 0; EntryKind = E_Location; }
92 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i)
93 : Begin(B), End(E), Variable(0), Merged(false),
94 Constant(true) { Constants.Int = i; EntryKind = E_Integer; }
95 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantFP *FPtr)
96 : Begin(B), End(E), Variable(0), Merged(false),
97 Constant(true) { Constants.CFP = FPtr; EntryKind = E_ConstantFP; }
98 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, const ConstantInt *IPtr)
99 : Begin(B), End(E), Variable(0), Merged(false),
100 Constant(true) { Constants.CIP = IPtr; EntryKind = E_ConstantInt; }
102 /// Empty entries are also used as a trigger to emit temp label. Such
103 /// labels are referenced is used to find debug_loc offset for a given DIE.
104 bool isEmpty() { return Begin == 0 && End == 0; }
105 bool isMerged() { return Merged; }
106 void Merge(DotDebugLocEntry *Next) {
107 if (!(Begin && Loc == Next->Loc && End == Next->Begin))
112 bool isLocation() const { return EntryKind == E_Location; }
113 bool isInt() const { return EntryKind == E_Integer; }
114 bool isConstantFP() const { return EntryKind == E_ConstantFP; }
115 bool isConstantInt() const { return EntryKind == E_ConstantInt; }
116 int64_t getInt() { return Constants.Int; }
117 const ConstantFP *getConstantFP() { return Constants.CFP; }
118 const ConstantInt *getConstantInt() { return Constants.CIP; }
121 //===----------------------------------------------------------------------===//
122 /// DbgVariable - This class is used to track local variable information.
125 DIVariable Var; // Variable Descriptor.
126 DIE *TheDIE; // Variable DIE.
127 unsigned DotDebugLocOffset; // Offset in DotDebugLocEntries.
129 // AbsVar may be NULL.
130 DbgVariable(DIVariable V) : Var(V), TheDIE(0), DotDebugLocOffset(~0U) {}
133 DIVariable getVariable() const { return Var; }
134 void setDIE(DIE *D) { TheDIE = D; }
135 DIE *getDIE() const { return TheDIE; }
136 void setDotDebugLocOffset(unsigned O) { DotDebugLocOffset = O; }
137 unsigned getDotDebugLocOffset() const { return DotDebugLocOffset; }
138 StringRef getName() const { return Var.getName(); }
139 // Translate tag to proper Dwarf tag.
140 unsigned getTag() const {
141 if (Var.getTag() == dwarf::DW_TAG_arg_variable)
142 return dwarf::DW_TAG_formal_parameter;
144 return dwarf::DW_TAG_variable;
146 bool variableHasComplexAddress() const {
147 assert(Var.Verify() && "Invalid complex DbgVariable!");
148 return Var.hasComplexAddress();
150 bool isBlockByrefVariable() const {
151 assert(Var.Verify() && "Invalid complex DbgVariable!");
152 return Var.isBlockByrefVariable();
154 unsigned getNumAddrElements() const {
155 assert(Var.Verify() && "Invalid complex DbgVariable!");
156 return Var.getNumAddrElements();
158 uint64_t getAddrElement(unsigned i) const {
159 return Var.getAddrElement(i);
161 DIType getType() const;
165 /// Asm - Target of Dwarf emission.
168 /// MMI - Collected machine module information.
169 MachineModuleInfo *MMI;
171 //===--------------------------------------------------------------------===//
172 // Attributes used to construct specific Dwarf sections.
175 CompileUnit *FirstCU;
176 DenseMap <const MDNode *, CompileUnit *> CUMap;
178 /// AbbreviationsSet - Used to uniquely define abbreviations.
180 FoldingSet<DIEAbbrev> AbbreviationsSet;
182 /// Abbreviations - A list of all the unique abbreviations in use.
184 std::vector<DIEAbbrev *> Abbreviations;
186 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
187 /// id mapped to a unique id.
188 StringMap<unsigned> SourceIdMap;
190 /// StringPool - A String->Symbol mapping of strings used by indirect
192 StringMap<std::pair<MCSymbol*, unsigned> > StringPool;
193 unsigned NextStringPoolNumber;
195 MCSymbol *getStringPoolEntry(StringRef Str);
197 /// SectionMap - Provides a unique id per text section.
199 UniqueVector<const MCSection*> SectionMap;
201 /// CurrentFnArguments - List of Arguments (DbgValues) for current function.
202 SmallVector<DbgVariable *, 8> CurrentFnArguments;
204 LexicalScopes LScopes;
206 /// AbstractSPDies - Collection of abstract subprogram DIEs.
207 DenseMap<const MDNode *, DIE *> AbstractSPDies;
209 /// ScopeVariables - Collection of dbg variables of a scope.
210 DenseMap<LexicalScope *, SmallVector<DbgVariable *, 8> > ScopeVariables;
212 /// AbstractVariables - Collection on abstract variables.
213 DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
215 /// DbgVariableToFrameIndexMap - Tracks frame index used to find
216 /// variable's value.
217 DenseMap<const DbgVariable *, int> DbgVariableToFrameIndexMap;
219 /// DbgVariableToDbgInstMap - Maps DbgVariable to corresponding DBG_VALUE
220 /// machine instruction.
221 DenseMap<const DbgVariable *, const MachineInstr *> DbgVariableToDbgInstMap;
223 /// DotDebugLocEntries - Collection of DotDebugLocEntry.
224 SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries;
226 /// UseDotDebugLocEntry - DW_AT_location attributes for the DIEs in this set
227 /// idetifies corresponding .debug_loc entry offset.
228 SmallPtrSet<const DIE *, 4> UseDotDebugLocEntry;
230 /// VarToAbstractVarMap - Maps DbgVariable with corresponding Abstract
231 /// DbgVariable, if any.
232 DenseMap<const DbgVariable *, const DbgVariable *> VarToAbstractVarMap;
234 /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
235 /// (at the end of the module) as DW_AT_inline.
236 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
238 /// InlineInfo - Keep track of inlined functions and their location. This
239 /// information is used to populate debug_inlined section.
240 typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels;
241 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
242 SmallVector<const MDNode *, 4> InlinedSPNodes;
244 // ProcessedSPNodes - This is a collection of subprogram MDNodes that
245 // are processed to create DIEs.
246 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
248 /// LabelsBeforeInsn - Maps instruction with label emitted before
250 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
252 /// LabelsAfterInsn - Maps instruction with label emitted after
254 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
256 /// UserVariables - Every user variable mentioned by a DBG_VALUE instruction
257 /// in order of appearance.
258 SmallVector<const MDNode*, 8> UserVariables;
260 /// DbgValues - For each user variable, keep a list of DBG_VALUE
261 /// instructions in order. The list can also contain normal instructions that
262 /// clobber the previous DBG_VALUE.
263 typedef DenseMap<const MDNode*, SmallVector<const MachineInstr*, 4> >
265 DbgValueHistoryMap DbgValues;
267 SmallVector<const MCSymbol *, 8> DebugRangeSymbols;
269 /// Previous instruction's location information. This is used to determine
270 /// label location to indicate scope boundries in dwarf debug info.
271 DebugLoc PrevInstLoc;
274 /// PrologEndLoc - This location indicates end of function prologue and
275 /// beginning of function body.
276 DebugLoc PrologEndLoc;
278 struct FunctionDebugFrameInfo {
280 std::vector<MachineMove> Moves;
282 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
283 : Number(Num), Moves(M) {}
286 std::vector<FunctionDebugFrameInfo> DebugFrames;
288 // DIEValueAllocator - All DIEValues are allocated through this allocator.
289 BumpPtrAllocator DIEValueAllocator;
291 // Section Symbols: these are assembler temporary labels that are emitted at
292 // the beginning of each supported dwarf section. These are used to form
293 // section offsets and are created by EmitSectionLabels.
294 MCSymbol *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
295 MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
296 MCSymbol *DwarfDebugLocSectionSym;
297 MCSymbol *FunctionBeginSym, *FunctionEndSym;
301 /// assignAbbrevNumber - Define a unique number for the abbreviation.
303 void assignAbbrevNumber(DIEAbbrev &Abbrev);
305 void addScopeVariable(LexicalScope *LS, DbgVariable *Var);
307 /// findAbstractVariable - Find abstract variable associated with Var.
308 DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc Loc);
310 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
311 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
312 /// If there are global variables in this scope then create and insert
313 /// DIEs for these variables.
314 DIE *updateSubprogramScopeDIE(const MDNode *SPNode);
316 /// constructLexicalScope - Construct new DW_TAG_lexical_block
317 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
318 DIE *constructLexicalScopeDIE(LexicalScope *Scope);
320 /// constructInlinedScopeDIE - This scope represents inlined body of
321 /// a function. Construct DIE to represent this concrete inlined copy
323 DIE *constructInlinedScopeDIE(LexicalScope *Scope);
325 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
326 DIE *constructVariableDIE(DbgVariable *DV, LexicalScope *S);
328 /// constructScopeDIE - Construct a DIE for this scope.
329 DIE *constructScopeDIE(LexicalScope *Scope);
331 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
332 /// the start of each one.
333 void EmitSectionLabels();
335 /// emitDIE - Recusively Emits a debug information entry.
337 void emitDIE(DIE *Die);
339 /// computeSizeAndOffset - Compute the size and offset of a DIE.
341 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
343 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
345 void computeSizeAndOffsets();
347 /// EmitDebugInfo - Emit the debug info section.
349 void emitDebugInfo();
351 /// emitAbbreviations - Emit the abbreviation section.
353 void emitAbbreviations() const;
355 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
358 void emitEndOfLineMatrix(unsigned SectionEnd);
360 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
362 void emitDebugPubNames();
364 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
366 void emitDebugPubTypes();
368 /// emitDebugStr - Emit visible names into a debug str section.
372 /// emitDebugLoc - Emit visible names into a debug loc section.
376 /// EmitDebugARanges - Emit visible names into a debug aranges section.
378 void EmitDebugARanges();
380 /// emitDebugRanges - Emit visible names into a debug ranges section.
382 void emitDebugRanges();
384 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
386 void emitDebugMacInfo();
388 /// emitDebugInlineInfo - Emit inline info using following format.
390 /// 1. length of section
391 /// 2. Dwarf version number
394 /// Entries (one "entry" for each function that was inlined):
396 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
397 /// otherwise offset into __debug_str for regular function name.
398 /// 2. offset into __debug_str section for regular function name.
399 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
400 /// instances for the function.
402 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
403 /// inlined instance; the die_offset points to the inlined_subroutine die in
404 /// the __debug_info section, and the low_pc is the starting address for the
405 /// inlining instance.
406 void emitDebugInlineInfo();
408 /// constructCompileUnit - Create new CompileUnit for the given
409 /// metadata node with tag DW_TAG_compile_unit.
410 void constructCompileUnit(const MDNode *N);
412 /// getCompielUnit - Get CompileUnit DIE.
413 CompileUnit *getCompileUnit(const MDNode *N) const;
415 /// constructGlobalVariableDIE - Construct global variable DIE.
416 void constructGlobalVariableDIE(const MDNode *N);
418 /// construct SubprogramDIE - Construct subprogram DIE.
419 void constructSubprogramDIE(const MDNode *N);
421 /// recordSourceLine - Register a source line with debug info. Returns the
422 /// unique label that was emitted and which provides correspondence to
423 /// the source line list.
424 void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
427 /// recordVariableFrameIndex - Record a variable's index.
428 void recordVariableFrameIndex(const DbgVariable *V, int Index);
430 /// findVariableFrameIndex - Return true if frame index for the variable
431 /// is found. Update FI to hold value of the index.
432 bool findVariableFrameIndex(const DbgVariable *V, int *FI);
434 /// identifyScopeMarkers() - Indentify instructions that are marking
435 /// beginning of or end of a scope.
436 void identifyScopeMarkers();
438 /// addCurrentFnArgument - If Var is an current function argument that add
439 /// it in CurrentFnArguments list.
440 bool addCurrentFnArgument(const MachineFunction *MF,
441 DbgVariable *Var, LexicalScope *Scope);
443 /// collectVariableInfo - Populate LexicalScope entries with variables' info.
444 void collectVariableInfo(const MachineFunction *,
445 SmallPtrSet<const MDNode *, 16> &ProcessedVars);
447 /// collectVariableInfoFromMMITable - Collect variable information from
448 /// side table maintained by MMI.
449 void collectVariableInfoFromMMITable(const MachineFunction * MF,
450 SmallPtrSet<const MDNode *, 16> &P);
452 /// requestLabelBeforeInsn - Ensure that a label will be emitted before MI.
453 void requestLabelBeforeInsn(const MachineInstr *MI) {
454 LabelsBeforeInsn.insert(std::make_pair(MI, (MCSymbol*)0));
457 /// getLabelBeforeInsn - Return Label preceding the instruction.
458 const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
460 /// requestLabelAfterInsn - Ensure that a label will be emitted after MI.
461 void requestLabelAfterInsn(const MachineInstr *MI) {
462 LabelsAfterInsn.insert(std::make_pair(MI, (MCSymbol*)0));
465 /// getLabelAfterInsn - Return Label immediately following the instruction.
466 const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
469 //===--------------------------------------------------------------------===//
470 // Main entry points.
472 DwarfDebug(AsmPrinter *A, Module *M);
475 /// beginModule - Emit all Dwarf sections that should come prior to the
477 void beginModule(Module *M);
479 /// endModule - Emit all Dwarf sections that should come after the content.
483 /// beginFunction - Gather pre-function debug information. Assumes being
484 /// emitted immediately after the function entry point.
485 void beginFunction(const MachineFunction *MF);
487 /// endFunction - Gather and emit post-function debug information.
489 void endFunction(const MachineFunction *MF);
491 /// beginInstruction - Process beginning of an instruction.
492 void beginInstruction(const MachineInstr *MI);
494 /// endInstruction - Prcess end of an instruction.
495 void endInstruction(const MachineInstr *MI);
497 /// GetOrCreateSourceID - Look up the source id with the given directory and
498 /// source file names. If none currently exists, create a new id and insert it
499 /// in the SourceIds map.
500 unsigned GetOrCreateSourceID(StringRef DirName, StringRef FullName);
502 /// createSubprogramDIE - Create new DIE using SP.
503 DIE *createSubprogramDIE(DISubprogram SP);
505 } // End of namespace llvm