1 //===-- llvm/CodeGen/DwarfCompileUnit.h - Dwarf Compile Unit ---*- 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 compile unit.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFCOMPILEUNIT_H
15 #define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFCOMPILEUNIT_H
17 #include "DwarfUnit.h"
18 #include "llvm/IR/DebugInfo.h"
19 #include "llvm/Support/Dwarf.h"
31 class DwarfCompileUnit final : public DwarfUnit {
32 /// A numeric ID unique among all CUs in the module
35 /// The attribute index of DW_AT_stmt_list in the compile unit DIE, avoiding
36 /// the need to search for it in applyStmtList.
37 DIE::value_iterator StmtListValue;
39 /// Skeleton unit associated with this unit.
40 DwarfCompileUnit *Skeleton;
42 /// The start of the unit within its section.
45 /// The start of the unit macro info within macro section.
46 MCSymbol *MacroLabelBegin;
48 typedef llvm::SmallVector<const MDNode *, 8> ImportedEntityList;
49 typedef llvm::DenseMap<const MDNode *, ImportedEntityList>
52 ImportedEntityMap ImportedEntities;
54 /// GlobalNames - A map of globally visible named entities for this unit.
55 StringMap<const DIE *> GlobalNames;
57 /// GlobalTypes - A map of globally visible types for this unit.
58 StringMap<const DIE *> GlobalTypes;
60 // List of range lists for a given compile unit, separate from the ranges for
62 SmallVector<RangeSpanList, 1> CURangeLists;
64 // List of ranges for a given compile unit.
65 SmallVector<RangeSpan, 2> CURanges;
67 // The base address of this unit, if any. Used for relative references in
69 const MCSymbol *BaseAddress;
71 DenseMap<const MDNode *, DIE *> AbstractSPDies;
72 DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
74 /// \brief Construct a DIE for the given DbgVariable without initializing the
75 /// DbgVariable's DIE reference.
76 DIE *constructVariableDIEImpl(const DbgVariable &DV, bool Abstract);
78 bool isDwoUnit() const override;
80 DenseMap<const MDNode *, DIE *> &getAbstractSPDies() {
81 if (isDwoUnit() && !DD->shareAcrossDWOCUs())
82 return AbstractSPDies;
83 return DU->getAbstractSPDies();
86 DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> &getAbstractVariables() {
87 if (isDwoUnit() && !DD->shareAcrossDWOCUs())
88 return AbstractVariables;
89 return DU->getAbstractVariables();
93 DwarfCompileUnit(unsigned UID, const DICompileUnit *Node, AsmPrinter *A,
94 DwarfDebug *DW, DwarfFile *DWU);
96 unsigned getUniqueID() const { return UniqueID; }
98 DwarfCompileUnit *getSkeleton() const {
102 bool includeMinimalInlineScopes() const;
106 /// Apply the DW_AT_stmt_list from this compile unit to the specified DIE.
107 void applyStmtList(DIE &D);
109 /// A pair of GlobalVariable and DIExpression.
111 const GlobalVariable *Var;
112 const DIExpression *Expr;
115 /// Get or create global variable DIE.
117 getOrCreateGlobalVariableDIE(const DIGlobalVariable *GV,
118 ArrayRef<GlobalExpr> GlobalExprs);
120 /// addLabelAddress - Add a dwarf label attribute data and value using
121 /// either DW_FORM_addr or DW_FORM_GNU_addr_index.
122 void addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
123 const MCSymbol *Label);
125 /// addLocalLabelAddress - Add a dwarf label attribute data and value using
126 /// DW_FORM_addr only.
127 void addLocalLabelAddress(DIE &Die, dwarf::Attribute Attribute,
128 const MCSymbol *Label);
130 /// addSectionDelta - Add a label delta attribute data and value.
131 DIE::value_iterator addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
132 const MCSymbol *Hi, const MCSymbol *Lo);
134 DwarfCompileUnit &getCU() override { return *this; }
136 unsigned getOrCreateSourceID(StringRef FileName, StringRef DirName) override;
138 void addImportedEntity(const DIImportedEntity* IE) {
139 DIScope *Scope = IE->getScope();
140 assert(Scope && "Invalid Scope encoding!");
141 if (!isa<DILocalScope>(Scope))
142 // No need to add imported enities that are not local declaration.
145 auto *LocalScope = cast<DILocalScope>(Scope)->getNonLexicalBlockFileScope();
146 ImportedEntities[LocalScope].push_back(IE);
149 /// addRange - Add an address range to the list of ranges for this unit.
150 void addRange(RangeSpan Range);
152 void attachLowHighPC(DIE &D, const MCSymbol *Begin, const MCSymbol *End);
154 /// addSectionLabel - Add a Dwarf section label attribute data and value.
156 DIE::value_iterator addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
157 const MCSymbol *Label,
158 const MCSymbol *Sec);
160 /// \brief Find DIE for the given subprogram and attach appropriate
161 /// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global
162 /// variables in this scope then create and insert DIEs for these
164 DIE &updateSubprogramScopeDIE(const DISubprogram *SP);
166 void constructScopeDIE(LexicalScope *Scope,
167 SmallVectorImpl<DIE *> &FinalChildren);
169 /// \brief A helper function to construct a RangeSpanList for a given
171 void addScopeRangeList(DIE &ScopeDIE, SmallVector<RangeSpan, 2> Range);
173 void attachRangesOrLowHighPC(DIE &D, SmallVector<RangeSpan, 2> Ranges);
175 void attachRangesOrLowHighPC(DIE &D,
176 const SmallVectorImpl<InsnRange> &Ranges);
177 /// \brief This scope represents inlined body of a function. Construct
178 /// DIE to represent this concrete inlined copy of the function.
179 DIE *constructInlinedScopeDIE(LexicalScope *Scope);
181 /// \brief Construct new DW_TAG_lexical_block for this scope and
182 /// attach DW_AT_low_pc/DW_AT_high_pc labels.
183 DIE *constructLexicalScopeDIE(LexicalScope *Scope);
185 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
186 DIE *constructVariableDIE(DbgVariable &DV, bool Abstract = false);
188 DIE *constructVariableDIE(DbgVariable &DV, const LexicalScope &Scope,
189 DIE *&ObjectPointer);
191 /// A helper function to create children of a Scope DIE.
192 DIE *createScopeChildrenDIE(LexicalScope *Scope,
193 SmallVectorImpl<DIE *> &Children,
194 unsigned *ChildScopeCount = nullptr);
196 /// \brief Construct a DIE for this subprogram scope.
197 void constructSubprogramScopeDIE(const DISubprogram *Sub, LexicalScope *Scope);
199 DIE *createAndAddScopeChildren(LexicalScope *Scope, DIE &ScopeDIE);
201 void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
203 /// \brief Construct import_module DIE.
204 DIE *constructImportedEntityDIE(const DIImportedEntity *Module);
206 void finishSubprogramDefinition(const DISubprogram *SP);
207 void finishVariableDefinition(const DbgVariable &Var);
208 /// Find abstract variable associated with Var.
209 typedef DbgValueHistoryMap::InlinedVariable InlinedVariable;
210 DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
211 const DILocalVariable *&Cleansed);
212 DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
213 void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope);
215 /// Set the skeleton unit associated with this unit.
216 void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
218 unsigned getLength() {
219 return sizeof(uint32_t) + // Length field
220 getHeaderSize() + getUnitDie().getSize();
223 void emitHeader(bool UseOffsets) override;
225 MCSymbol *getLabelBegin() const {
226 assert(getSection());
230 MCSymbol *getMacroLabelBegin() const {
231 return MacroLabelBegin;
234 /// Add a new global name to the compile unit.
235 void addGlobalName(StringRef Name, const DIE &Die,
236 const DIScope *Context) override;
238 /// Add a new global name present in a type unit to this compile unit.
239 void addGlobalNameForTypeUnit(StringRef Name, const DIScope *Context);
241 /// Add a new global type to the compile unit.
242 void addGlobalType(const DIType *Ty, const DIE &Die,
243 const DIScope *Context) override;
245 /// Add a new global type present in a type unit to this compile unit.
246 void addGlobalTypeUnitType(const DIType *Ty, const DIScope *Context);
248 const StringMap<const DIE *> &getGlobalNames() const { return GlobalNames; }
249 const StringMap<const DIE *> &getGlobalTypes() const { return GlobalTypes; }
251 /// Add DW_AT_location attribute for a DbgVariable based on provided
253 void addVariableAddress(const DbgVariable &DV, DIE &Die,
254 MachineLocation Location);
255 /// Add an address attribute to a die based on the location provided.
256 void addAddress(DIE &Die, dwarf::Attribute Attribute,
257 const MachineLocation &Location);
259 /// Start with the address based on the location provided, and generate the
260 /// DWARF information necessary to find the actual variable (navigating the
261 /// extra location information encoded in the type) based on the starting
262 /// location. Add the DWARF information to the die.
263 void addComplexAddress(const DbgVariable &DV, DIE &Die,
264 dwarf::Attribute Attribute,
265 const MachineLocation &Location);
267 /// Add a Dwarf loclistptr attribute data and value.
268 void addLocationList(DIE &Die, dwarf::Attribute Attribute, unsigned Index);
269 void applyVariableAttributes(const DbgVariable &Var, DIE &VariableDie);
271 /// Add a Dwarf expression attribute data and value.
272 void addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr);
274 void applySubprogramAttributesToDefinition(const DISubprogram *SP,
277 /// getRangeLists - Get the vector of range lists.
278 const SmallVectorImpl<RangeSpanList> &getRangeLists() const {
279 return (Skeleton ? Skeleton : this)->CURangeLists;
282 /// getRanges - Get the list of ranges for this unit.
283 const SmallVectorImpl<RangeSpan> &getRanges() const { return CURanges; }
284 SmallVector<RangeSpan, 2> takeRanges() { return std::move(CURanges); }
286 void setBaseAddress(const MCSymbol *Base) { BaseAddress = Base; }
287 const MCSymbol *getBaseAddress() const { return BaseAddress; }
290 } // end llvm namespace