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"
19 #include "llvm/Analysis/DebugInfo.h"
21 #include "llvm/ADT/DenseMap.h"
22 #include "llvm/ADT/FoldingSet.h"
23 #include "llvm/ADT/SmallPtrSet.h"
24 #include "llvm/ADT/StringMap.h"
25 #include "llvm/ADT/UniqueVector.h"
26 #include "llvm/Support/Allocator.h"
27 #include "llvm/Support/DebugLoc.h"
32 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;
70 DotDebugLocEntry() : Begin(0), End(0), Merged(false) {}
71 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L)
72 : Begin(B), End(E), Loc(L), Merged(false) {}
73 /// Empty entries are also used as a trigger to emit temp label. Such
74 /// labels are referenced is used to find debug_loc offset for a given DIE.
75 bool isEmpty() { return Begin == 0 && End == 0; }
76 bool isMerged() { return Merged; }
77 void Merge(DotDebugLocEntry *Next) {
78 if (!(Begin && Loc == Next->Loc && End == Next->Begin))
85 //===----------------------------------------------------------------------===//
86 /// DbgVariable - This class is used to track local variable information.
89 DIVariable Var; // Variable Descriptor.
90 DIE *TheDIE; // Variable DIE.
91 unsigned DotDebugLocOffset; // Offset in DotDebugLocEntries.
93 // AbsVar may be NULL.
94 DbgVariable(DIVariable V) : Var(V), TheDIE(0), DotDebugLocOffset(~0U) {}
97 DIVariable getVariable() const { return Var; }
98 void setDIE(DIE *D) { TheDIE = D; }
99 DIE *getDIE() const { return TheDIE; }
100 void setDotDebugLocOffset(unsigned O) { DotDebugLocOffset = O; }
101 unsigned getDotDebugLocOffset() const { return DotDebugLocOffset; }
102 StringRef getName() const { return Var.getName(); }
103 unsigned getTag() const { return Var.getTag(); }
104 bool variableHasComplexAddress() const {
105 assert(Var.Verify() && "Invalid complex DbgVariable!");
106 return Var.hasComplexAddress();
108 bool isBlockByrefVariable() const {
109 assert(Var.Verify() && "Invalid complex DbgVariable!");
110 return Var.isBlockByrefVariable();
112 unsigned getNumAddrElements() const {
113 assert(Var.Verify() && "Invalid complex DbgVariable!");
114 return Var.getNumAddrElements();
116 uint64_t getAddrElement(unsigned i) const {
117 return Var.getAddrElement(i);
119 DIType getType() const;
123 /// Asm - Target of Dwarf emission.
126 /// MMI - Collected machine module information.
127 MachineModuleInfo *MMI;
129 //===--------------------------------------------------------------------===//
130 // Attributes used to construct specific Dwarf sections.
133 CompileUnit *FirstCU;
134 DenseMap <const MDNode *, CompileUnit *> CUMap;
136 /// AbbreviationsSet - Used to uniquely define abbreviations.
138 FoldingSet<DIEAbbrev> AbbreviationsSet;
140 /// Abbreviations - A list of all the unique abbreviations in use.
142 std::vector<DIEAbbrev *> Abbreviations;
144 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
145 /// id mapped to a unique id.
146 StringMap<unsigned> SourceIdMap;
148 /// StringPool - A String->Symbol mapping of strings used by indirect
150 StringMap<std::pair<MCSymbol*, unsigned> > StringPool;
151 unsigned NextStringPoolNumber;
153 MCSymbol *getStringPoolEntry(StringRef Str);
155 /// SectionMap - Provides a unique id per text section.
157 UniqueVector<const MCSection*> SectionMap;
159 /// CurrentFnDbgScope - Top level scope for the current function.
161 DbgScope *CurrentFnDbgScope;
163 /// CurrentFnArguments - List of Arguments (DbgValues) for current function.
164 SmallVector<DbgVariable *, 8> CurrentFnArguments;
166 /// DbgScopeMap - Tracks the scopes in the current function. Owns the
167 /// contained DbgScope*s.
169 DenseMap<const MDNode *, DbgScope *> DbgScopeMap;
171 /// ConcreteScopes - Tracks the concrete scopees in the current function.
172 /// These scopes are also included in DbgScopeMap.
173 DenseMap<const MDNode *, DbgScope *> ConcreteScopes;
175 /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
176 /// not included DbgScopeMap. AbstractScopes owns its DbgScope*s.
177 DenseMap<const MDNode *, DbgScope *> AbstractScopes;
179 /// AbstractSPDies - Collection of abstract subprogram DIEs.
180 DenseMap<const MDNode *, DIE *> AbstractSPDies;
182 /// AbstractScopesList - Tracks abstract scopes constructed while processing
183 /// a function. This list is cleared during endFunction().
184 SmallVector<DbgScope *, 4>AbstractScopesList;
186 /// AbstractVariables - Collection on abstract variables. Owned by the
187 /// DbgScopes in AbstractScopes.
188 DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
190 /// DbgVariableToFrameIndexMap - Tracks frame index used to find
191 /// variable's value.
192 DenseMap<const DbgVariable *, int> DbgVariableToFrameIndexMap;
194 /// DbgVariableToDbgInstMap - Maps DbgVariable to corresponding DBG_VALUE
195 /// machine instruction.
196 DenseMap<const DbgVariable *, const MachineInstr *> DbgVariableToDbgInstMap;
198 /// DotDebugLocEntries - Collection of DotDebugLocEntry.
199 SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries;
201 /// UseDotDebugLocEntry - DW_AT_location attributes for the DIEs in this set
202 /// idetifies corresponding .debug_loc entry offset.
203 SmallPtrSet<const DIE *, 4> UseDotDebugLocEntry;
205 /// VarToAbstractVarMap - Maps DbgVariable with corresponding Abstract
206 /// DbgVariable, if any.
207 DenseMap<const DbgVariable *, const DbgVariable *> VarToAbstractVarMap;
209 /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
210 /// (at the end of the module) as DW_AT_inline.
211 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
213 /// ContainingTypeMap - This map is used to keep track of subprogram DIEs that
214 /// need DW_AT_containing_type attribute. This attribute points to a DIE that
215 /// corresponds to the MDNode mapped with the subprogram DIE.
216 DenseMap<DIE *, const MDNode *> ContainingTypeMap;
218 /// InlineInfo - Keep track of inlined functions and their location. This
219 /// information is used to populate debug_inlined section.
220 typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels;
221 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
222 SmallVector<const MDNode *, 4> InlinedSPNodes;
224 // ProcessedSPNodes - This is a collection of subprogram MDNodes that
225 // are processed to create DIEs.
226 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
228 /// LabelsBeforeInsn - Maps instruction with label emitted before
230 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
232 /// LabelsAfterInsn - Maps instruction with label emitted after
234 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
236 /// UserVariables - Every user variable mentioned by a DBG_VALUE instruction
237 /// in order of appearance.
238 SmallVector<const MDNode*, 8> UserVariables;
240 /// DbgValues - For each user variable, keep a list of DBG_VALUE
241 /// instructions in order. The list can also contain normal instructions that
242 /// clobber the previous DBG_VALUE.
243 typedef DenseMap<const MDNode*, SmallVector<const MachineInstr*, 4> >
245 DbgValueHistoryMap DbgValues;
247 SmallVector<const MCSymbol *, 8> DebugRangeSymbols;
249 /// Previous instruction's location information. This is used to determine
250 /// label location to indicate scope boundries in dwarf debug info.
251 DebugLoc PrevInstLoc;
254 struct FunctionDebugFrameInfo {
256 std::vector<MachineMove> Moves;
258 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
259 : Number(Num), Moves(M) {}
262 std::vector<FunctionDebugFrameInfo> DebugFrames;
264 // DIEValueAllocator - All DIEValues are allocated through this allocator.
265 BumpPtrAllocator DIEValueAllocator;
267 // Section Symbols: these are assembler temporary labels that are emitted at
268 // the beginning of each supported dwarf section. These are used to form
269 // section offsets and are created by EmitSectionLabels.
270 MCSymbol *DwarfFrameSectionSym, *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
271 MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
272 MCSymbol *DwarfDebugLocSectionSym;
273 MCSymbol *FunctionBeginSym, *FunctionEndSym;
277 /// assignAbbrevNumber - Define a unique number for the abbreviation.
279 void assignAbbrevNumber(DIEAbbrev &Abbrev);
281 /// getOrCreateDbgScope - Create DbgScope for the scope.
282 DbgScope *getOrCreateDbgScope(const MDNode *Scope, const MDNode *InlinedAt);
284 DbgScope *getOrCreateAbstractScope(const MDNode *N);
286 /// findAbstractVariable - Find abstract variable associated with Var.
287 DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc Loc);
289 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
290 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
291 /// If there are global variables in this scope then create and insert
292 /// DIEs for these variables.
293 DIE *updateSubprogramScopeDIE(const MDNode *SPNode);
295 /// constructLexicalScope - Construct new DW_TAG_lexical_block
296 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
297 DIE *constructLexicalScopeDIE(DbgScope *Scope);
299 /// constructInlinedScopeDIE - This scope represents inlined body of
300 /// a function. Construct DIE to represent this concrete inlined copy
302 DIE *constructInlinedScopeDIE(DbgScope *Scope);
304 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
305 DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
307 /// constructScopeDIE - Construct a DIE for this scope.
308 DIE *constructScopeDIE(DbgScope *Scope);
310 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
311 /// the start of each one.
312 void EmitSectionLabels();
314 /// emitDIE - Recusively Emits a debug information entry.
316 void emitDIE(DIE *Die);
318 /// computeSizeAndOffset - Compute the size and offset of a DIE.
320 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
322 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
324 void computeSizeAndOffsets();
326 /// EmitDebugInfo - Emit the debug info section.
328 void emitDebugInfo();
330 /// emitAbbreviations - Emit the abbreviation section.
332 void emitAbbreviations() const;
334 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
337 void emitEndOfLineMatrix(unsigned SectionEnd);
339 /// emitCommonDebugFrame - Emit common frame info into a debug frame section.
341 void emitCommonDebugFrame();
343 /// emitFunctionDebugFrame - Emit per function frame info into a debug frame
345 void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
347 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
349 void emitDebugPubNames();
351 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
353 void emitDebugPubTypes();
355 /// emitDebugStr - Emit visible names into a debug str section.
359 /// emitDebugLoc - Emit visible names into a debug loc section.
363 /// EmitDebugARanges - Emit visible names into a debug aranges section.
365 void EmitDebugARanges();
367 /// emitDebugRanges - Emit visible names into a debug ranges section.
369 void emitDebugRanges();
371 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
373 void emitDebugMacInfo();
375 /// emitDebugInlineInfo - Emit inline info using following format.
377 /// 1. length of section
378 /// 2. Dwarf version number
381 /// Entries (one "entry" for each function that was inlined):
383 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
384 /// otherwise offset into __debug_str for regular function name.
385 /// 2. offset into __debug_str section for regular function name.
386 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
387 /// instances for the function.
389 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
390 /// inlined instance; the die_offset points to the inlined_subroutine die in
391 /// the __debug_info section, and the low_pc is the starting address for the
392 /// inlining instance.
393 void emitDebugInlineInfo();
395 /// constructCompileUnit - Create new CompileUnit for the given
396 /// metadata node with tag DW_TAG_compile_unit.
397 void constructCompileUnit(const MDNode *N);
399 /// getCompielUnit - Get CompileUnit DIE.
400 CompileUnit *getCompileUnit(const MDNode *N) const;
402 /// constructGlobalVariableDIE - Construct global variable DIE.
403 void constructGlobalVariableDIE(const MDNode *N);
405 /// construct SubprogramDIE - Construct subprogram DIE.
406 void constructSubprogramDIE(const MDNode *N);
408 /// recordSourceLine - Register a source line with debug info. Returns the
409 /// unique label that was emitted and which provides correspondence to
410 /// the source line list.
411 void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope);
413 /// recordVariableFrameIndex - Record a variable's index.
414 void recordVariableFrameIndex(const DbgVariable *V, int Index);
416 /// findVariableFrameIndex - Return true if frame index for the variable
417 /// is found. Update FI to hold value of the index.
418 bool findVariableFrameIndex(const DbgVariable *V, int *FI);
420 /// findDbgScope - Find DbgScope for the debug loc attached with an
422 DbgScope *findDbgScope(const MachineInstr *MI);
424 /// identifyScopeMarkers() - Indentify instructions that are marking
425 /// beginning of or end of a scope.
426 void identifyScopeMarkers();
428 /// extractScopeInformation - Scan machine instructions in this function
429 /// and collect DbgScopes. Return true, if atleast one scope was found.
430 bool extractScopeInformation();
432 /// addCurrentFnArgument - If Var is an current function argument that add
433 /// it in CurrentFnArguments list.
434 bool addCurrentFnArgument(const MachineFunction *MF,
435 DbgVariable *Var, DbgScope *Scope);
437 /// collectVariableInfo - Populate DbgScope entries with variables' info.
438 void collectVariableInfo(const MachineFunction *,
439 SmallPtrSet<const MDNode *, 16> &ProcessedVars);
441 /// collectVariableInfoFromMMITable - Collect variable information from
442 /// side table maintained by MMI.
443 void collectVariableInfoFromMMITable(const MachineFunction * MF,
444 SmallPtrSet<const MDNode *, 16> &P);
446 /// requestLabelBeforeInsn - Ensure that a label will be emitted before MI.
447 void requestLabelBeforeInsn(const MachineInstr *MI) {
448 LabelsBeforeInsn.insert(std::make_pair(MI, (MCSymbol*)0));
451 /// getLabelBeforeInsn - Return Label preceding the instruction.
452 const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
454 /// requestLabelAfterInsn - Ensure that a label will be emitted after MI.
455 void requestLabelAfterInsn(const MachineInstr *MI) {
456 LabelsAfterInsn.insert(std::make_pair(MI, (MCSymbol*)0));
459 /// getLabelAfterInsn - Return Label immediately following the instruction.
460 const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
463 //===--------------------------------------------------------------------===//
464 // Main entry points.
466 DwarfDebug(AsmPrinter *A, Module *M);
469 /// beginModule - Emit all Dwarf sections that should come prior to the
471 void beginModule(Module *M);
473 /// endModule - Emit all Dwarf sections that should come after the content.
477 /// beginFunction - Gather pre-function debug information. Assumes being
478 /// emitted immediately after the function entry point.
479 void beginFunction(const MachineFunction *MF);
481 /// endFunction - Gather and emit post-function debug information.
483 void endFunction(const MachineFunction *MF);
485 /// beginInstruction - Process beginning of an instruction.
486 void beginInstruction(const MachineInstr *MI);
488 /// endInstruction - Prcess end of an instruction.
489 void endInstruction(const MachineInstr *MI);
491 /// GetOrCreateSourceID - Look up the source id with the given directory and
492 /// source file names. If none currently exists, create a new id and insert it
493 /// in the SourceIds map.
494 unsigned GetOrCreateSourceID(StringRef DirName, StringRef FullName);
496 /// createSubprogramDIE - Create new DIE using SP.
497 DIE *createSubprogramDIE(DISubprogram SP);
499 } // End of namespace llvm