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;
69 const MDNode *Variable;
74 : Begin(0), End(0), Variable(0), Merged(false),
75 Constant(false), iConstant(0) {}
76 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, MachineLocation &L,
78 : Begin(B), End(E), Loc(L), Variable(V), Merged(false),
79 Constant(false), iConstant(0) {}
80 DotDebugLocEntry(const MCSymbol *B, const MCSymbol *E, int64_t i)
81 : Begin(B), End(E), Variable(0), Merged(false),
82 Constant(true), iConstant(i) {}
84 /// Empty entries are also used as a trigger to emit temp label. Such
85 /// labels are referenced is used to find debug_loc offset for a given DIE.
86 bool isEmpty() { return Begin == 0 && End == 0; }
87 bool isMerged() { return Merged; }
88 void Merge(DotDebugLocEntry *Next) {
89 if (!(Begin && Loc == Next->Loc && End == Next->Begin))
94 bool isConstant() { return Constant; }
95 int64_t getConstant() { return iConstant; }
98 //===----------------------------------------------------------------------===//
99 /// DbgVariable - This class is used to track local variable information.
102 DIVariable Var; // Variable Descriptor.
103 DIE *TheDIE; // Variable DIE.
104 unsigned DotDebugLocOffset; // Offset in DotDebugLocEntries.
106 // AbsVar may be NULL.
107 DbgVariable(DIVariable V) : Var(V), TheDIE(0), DotDebugLocOffset(~0U) {}
110 DIVariable getVariable() const { return Var; }
111 void setDIE(DIE *D) { TheDIE = D; }
112 DIE *getDIE() const { return TheDIE; }
113 void setDotDebugLocOffset(unsigned O) { DotDebugLocOffset = O; }
114 unsigned getDotDebugLocOffset() const { return DotDebugLocOffset; }
115 StringRef getName() const { return Var.getName(); }
116 unsigned getTag() const { return Var.getTag(); }
117 bool variableHasComplexAddress() const {
118 assert(Var.Verify() && "Invalid complex DbgVariable!");
119 return Var.hasComplexAddress();
121 bool isBlockByrefVariable() const {
122 assert(Var.Verify() && "Invalid complex DbgVariable!");
123 return Var.isBlockByrefVariable();
125 unsigned getNumAddrElements() const {
126 assert(Var.Verify() && "Invalid complex DbgVariable!");
127 return Var.getNumAddrElements();
129 uint64_t getAddrElement(unsigned i) const {
130 return Var.getAddrElement(i);
132 DIType getType() const;
136 /// Asm - Target of Dwarf emission.
139 /// MMI - Collected machine module information.
140 MachineModuleInfo *MMI;
142 //===--------------------------------------------------------------------===//
143 // Attributes used to construct specific Dwarf sections.
146 CompileUnit *FirstCU;
147 DenseMap <const MDNode *, CompileUnit *> CUMap;
149 /// AbbreviationsSet - Used to uniquely define abbreviations.
151 FoldingSet<DIEAbbrev> AbbreviationsSet;
153 /// Abbreviations - A list of all the unique abbreviations in use.
155 std::vector<DIEAbbrev *> Abbreviations;
157 /// SourceIdMap - Source id map, i.e. pair of directory id and source file
158 /// id mapped to a unique id.
159 StringMap<unsigned> SourceIdMap;
161 /// StringPool - A String->Symbol mapping of strings used by indirect
163 StringMap<std::pair<MCSymbol*, unsigned> > StringPool;
164 unsigned NextStringPoolNumber;
166 MCSymbol *getStringPoolEntry(StringRef Str);
168 /// SectionMap - Provides a unique id per text section.
170 UniqueVector<const MCSection*> SectionMap;
172 /// CurrentFnDbgScope - Top level scope for the current function.
174 DbgScope *CurrentFnDbgScope;
176 /// CurrentFnArguments - List of Arguments (DbgValues) for current function.
177 SmallVector<DbgVariable *, 8> CurrentFnArguments;
179 /// DbgScopeMap - Tracks the scopes in the current function. Owns the
180 /// contained DbgScope*s.
182 DenseMap<const MDNode *, DbgScope *> DbgScopeMap;
184 /// ConcreteScopes - Tracks the concrete scopees in the current function.
185 /// These scopes are also included in DbgScopeMap.
186 DenseMap<const MDNode *, DbgScope *> ConcreteScopes;
188 /// AbstractScopes - Tracks the abstract scopes a module. These scopes are
189 /// not included DbgScopeMap. AbstractScopes owns its DbgScope*s.
190 DenseMap<const MDNode *, DbgScope *> AbstractScopes;
192 /// AbstractSPDies - Collection of abstract subprogram DIEs.
193 DenseMap<const MDNode *, DIE *> AbstractSPDies;
195 /// AbstractScopesList - Tracks abstract scopes constructed while processing
196 /// a function. This list is cleared during endFunction().
197 SmallVector<DbgScope *, 4>AbstractScopesList;
199 /// AbstractVariables - Collection on abstract variables. Owned by the
200 /// DbgScopes in AbstractScopes.
201 DenseMap<const MDNode *, DbgVariable *> AbstractVariables;
203 /// DbgVariableToFrameIndexMap - Tracks frame index used to find
204 /// variable's value.
205 DenseMap<const DbgVariable *, int> DbgVariableToFrameIndexMap;
207 /// DbgVariableToDbgInstMap - Maps DbgVariable to corresponding DBG_VALUE
208 /// machine instruction.
209 DenseMap<const DbgVariable *, const MachineInstr *> DbgVariableToDbgInstMap;
211 /// DotDebugLocEntries - Collection of DotDebugLocEntry.
212 SmallVector<DotDebugLocEntry, 4> DotDebugLocEntries;
214 /// UseDotDebugLocEntry - DW_AT_location attributes for the DIEs in this set
215 /// idetifies corresponding .debug_loc entry offset.
216 SmallPtrSet<const DIE *, 4> UseDotDebugLocEntry;
218 /// VarToAbstractVarMap - Maps DbgVariable with corresponding Abstract
219 /// DbgVariable, if any.
220 DenseMap<const DbgVariable *, const DbgVariable *> VarToAbstractVarMap;
222 /// InliendSubprogramDIEs - Collection of subprgram DIEs that are marked
223 /// (at the end of the module) as DW_AT_inline.
224 SmallPtrSet<DIE *, 4> InlinedSubprogramDIEs;
226 /// ContainingTypeMap - This map is used to keep track of subprogram DIEs that
227 /// need DW_AT_containing_type attribute. This attribute points to a DIE that
228 /// corresponds to the MDNode mapped with the subprogram DIE.
229 DenseMap<DIE *, const MDNode *> ContainingTypeMap;
231 /// InlineInfo - Keep track of inlined functions and their location. This
232 /// information is used to populate debug_inlined section.
233 typedef std::pair<const MCSymbol *, DIE *> InlineInfoLabels;
234 DenseMap<const MDNode *, SmallVector<InlineInfoLabels, 4> > InlineInfo;
235 SmallVector<const MDNode *, 4> InlinedSPNodes;
237 // ProcessedSPNodes - This is a collection of subprogram MDNodes that
238 // are processed to create DIEs.
239 SmallPtrSet<const MDNode *, 16> ProcessedSPNodes;
241 /// LabelsBeforeInsn - Maps instruction with label emitted before
243 DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
245 /// LabelsAfterInsn - Maps instruction with label emitted after
247 DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
249 /// UserVariables - Every user variable mentioned by a DBG_VALUE instruction
250 /// in order of appearance.
251 SmallVector<const MDNode*, 8> UserVariables;
253 /// DbgValues - For each user variable, keep a list of DBG_VALUE
254 /// instructions in order. The list can also contain normal instructions that
255 /// clobber the previous DBG_VALUE.
256 typedef DenseMap<const MDNode*, SmallVector<const MachineInstr*, 4> >
258 DbgValueHistoryMap DbgValues;
260 SmallVector<const MCSymbol *, 8> DebugRangeSymbols;
262 /// Previous instruction's location information. This is used to determine
263 /// label location to indicate scope boundries in dwarf debug info.
264 DebugLoc PrevInstLoc;
267 /// PrologEndLoc - This location indicates end of function prologue and
268 /// beginning of function body.
269 DebugLoc PrologEndLoc;
271 struct FunctionDebugFrameInfo {
273 std::vector<MachineMove> Moves;
275 FunctionDebugFrameInfo(unsigned Num, const std::vector<MachineMove> &M)
276 : Number(Num), Moves(M) {}
279 std::vector<FunctionDebugFrameInfo> DebugFrames;
281 // DIEValueAllocator - All DIEValues are allocated through this allocator.
282 BumpPtrAllocator DIEValueAllocator;
284 // Section Symbols: these are assembler temporary labels that are emitted at
285 // the beginning of each supported dwarf section. These are used to form
286 // section offsets and are created by EmitSectionLabels.
287 MCSymbol *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
288 MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
289 MCSymbol *DwarfDebugLocSectionSym;
290 MCSymbol *FunctionBeginSym, *FunctionEndSym;
294 /// assignAbbrevNumber - Define a unique number for the abbreviation.
296 void assignAbbrevNumber(DIEAbbrev &Abbrev);
298 /// getOrCreateDbgScope - Create DbgScope for the scope.
299 DbgScope *getOrCreateDbgScope(const MDNode *Scope, const MDNode *InlinedAt);
301 DbgScope *getOrCreateAbstractScope(const MDNode *N);
303 /// findAbstractVariable - Find abstract variable associated with Var.
304 DbgVariable *findAbstractVariable(DIVariable &Var, DebugLoc Loc);
306 /// updateSubprogramScopeDIE - Find DIE for the given subprogram and
307 /// attach appropriate DW_AT_low_pc and DW_AT_high_pc attributes.
308 /// If there are global variables in this scope then create and insert
309 /// DIEs for these variables.
310 DIE *updateSubprogramScopeDIE(const MDNode *SPNode);
312 /// constructLexicalScope - Construct new DW_TAG_lexical_block
313 /// for this scope and attach DW_AT_low_pc/DW_AT_high_pc labels.
314 DIE *constructLexicalScopeDIE(DbgScope *Scope);
316 /// constructInlinedScopeDIE - This scope represents inlined body of
317 /// a function. Construct DIE to represent this concrete inlined copy
319 DIE *constructInlinedScopeDIE(DbgScope *Scope);
321 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
322 DIE *constructVariableDIE(DbgVariable *DV, DbgScope *S);
324 /// constructScopeDIE - Construct a DIE for this scope.
325 DIE *constructScopeDIE(DbgScope *Scope);
327 /// EmitSectionLabels - Emit initial Dwarf sections with a label at
328 /// the start of each one.
329 void EmitSectionLabels();
331 /// emitDIE - Recusively Emits a debug information entry.
333 void emitDIE(DIE *Die);
335 /// computeSizeAndOffset - Compute the size and offset of a DIE.
337 unsigned computeSizeAndOffset(DIE *Die, unsigned Offset, bool Last);
339 /// computeSizeAndOffsets - Compute the size and offset of all the DIEs.
341 void computeSizeAndOffsets();
343 /// EmitDebugInfo - Emit the debug info section.
345 void emitDebugInfo();
347 /// emitAbbreviations - Emit the abbreviation section.
349 void emitAbbreviations() const;
351 /// emitEndOfLineMatrix - Emit the last address of the section and the end of
354 void emitEndOfLineMatrix(unsigned SectionEnd);
356 /// emitDebugPubNames - Emit visible names into a debug pubnames section.
358 void emitDebugPubNames();
360 /// emitDebugPubTypes - Emit visible types into a debug pubtypes section.
362 void emitDebugPubTypes();
364 /// emitDebugStr - Emit visible names into a debug str section.
368 /// emitDebugLoc - Emit visible names into a debug loc section.
372 /// EmitDebugARanges - Emit visible names into a debug aranges section.
374 void EmitDebugARanges();
376 /// emitDebugRanges - Emit visible names into a debug ranges section.
378 void emitDebugRanges();
380 /// emitDebugMacInfo - Emit visible names into a debug macinfo section.
382 void emitDebugMacInfo();
384 /// emitDebugInlineInfo - Emit inline info using following format.
386 /// 1. length of section
387 /// 2. Dwarf version number
390 /// Entries (one "entry" for each function that was inlined):
392 /// 1. offset into __debug_str section for MIPS linkage name, if exists;
393 /// otherwise offset into __debug_str for regular function name.
394 /// 2. offset into __debug_str section for regular function name.
395 /// 3. an unsigned LEB128 number indicating the number of distinct inlining
396 /// instances for the function.
398 /// The rest of the entry consists of a {die_offset, low_pc} pair for each
399 /// inlined instance; the die_offset points to the inlined_subroutine die in
400 /// the __debug_info section, and the low_pc is the starting address for the
401 /// inlining instance.
402 void emitDebugInlineInfo();
404 /// constructCompileUnit - Create new CompileUnit for the given
405 /// metadata node with tag DW_TAG_compile_unit.
406 void constructCompileUnit(const MDNode *N);
408 /// getCompielUnit - Get CompileUnit DIE.
409 CompileUnit *getCompileUnit(const MDNode *N) const;
411 /// constructGlobalVariableDIE - Construct global variable DIE.
412 void constructGlobalVariableDIE(const MDNode *N);
414 /// construct SubprogramDIE - Construct subprogram DIE.
415 void constructSubprogramDIE(const MDNode *N);
417 /// recordSourceLine - Register a source line with debug info. Returns the
418 /// unique label that was emitted and which provides correspondence to
419 /// the source line list.
420 void recordSourceLine(unsigned Line, unsigned Col, const MDNode *Scope,
423 /// recordVariableFrameIndex - Record a variable's index.
424 void recordVariableFrameIndex(const DbgVariable *V, int Index);
426 /// findVariableFrameIndex - Return true if frame index for the variable
427 /// is found. Update FI to hold value of the index.
428 bool findVariableFrameIndex(const DbgVariable *V, int *FI);
430 /// findDbgScope - Find DbgScope for the debug loc attached with an
432 DbgScope *findDbgScope(const MachineInstr *MI);
434 /// identifyScopeMarkers() - Indentify instructions that are marking
435 /// beginning of or end of a scope.
436 void identifyScopeMarkers();
438 /// extractScopeInformation - Scan machine instructions in this function
439 /// and collect DbgScopes. Return true, if atleast one scope was found.
440 bool extractScopeInformation();
442 /// addCurrentFnArgument - If Var is an current function argument that add
443 /// it in CurrentFnArguments list.
444 bool addCurrentFnArgument(const MachineFunction *MF,
445 DbgVariable *Var, DbgScope *Scope);
447 /// collectVariableInfo - Populate DbgScope entries with variables' info.
448 void collectVariableInfo(const MachineFunction *,
449 SmallPtrSet<const MDNode *, 16> &ProcessedVars);
451 /// collectVariableInfoFromMMITable - Collect variable information from
452 /// side table maintained by MMI.
453 void collectVariableInfoFromMMITable(const MachineFunction * MF,
454 SmallPtrSet<const MDNode *, 16> &P);
456 /// requestLabelBeforeInsn - Ensure that a label will be emitted before MI.
457 void requestLabelBeforeInsn(const MachineInstr *MI) {
458 LabelsBeforeInsn.insert(std::make_pair(MI, (MCSymbol*)0));
461 /// getLabelBeforeInsn - Return Label preceding the instruction.
462 const MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
464 /// requestLabelAfterInsn - Ensure that a label will be emitted after MI.
465 void requestLabelAfterInsn(const MachineInstr *MI) {
466 LabelsAfterInsn.insert(std::make_pair(MI, (MCSymbol*)0));
469 /// getLabelAfterInsn - Return Label immediately following the instruction.
470 const MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
473 //===--------------------------------------------------------------------===//
474 // Main entry points.
476 DwarfDebug(AsmPrinter *A, Module *M);
479 /// beginModule - Emit all Dwarf sections that should come prior to the
481 void beginModule(Module *M);
483 /// endModule - Emit all Dwarf sections that should come after the content.
487 /// beginFunction - Gather pre-function debug information. Assumes being
488 /// emitted immediately after the function entry point.
489 void beginFunction(const MachineFunction *MF);
491 /// endFunction - Gather and emit post-function debug information.
493 void endFunction(const MachineFunction *MF);
495 /// beginInstruction - Process beginning of an instruction.
496 void beginInstruction(const MachineInstr *MI);
498 /// endInstruction - Prcess end of an instruction.
499 void endInstruction(const MachineInstr *MI);
501 /// GetOrCreateSourceID - Look up the source id with the given directory and
502 /// source file names. If none currently exists, create a new id and insert it
503 /// in the SourceIds map.
504 unsigned GetOrCreateSourceID(StringRef DirName, StringRef FullName);
506 /// createSubprogramDIE - Create new DIE using SP.
507 DIE *createSubprogramDIE(DISubprogram SP);
509 } // End of namespace llvm