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/ADT/StringRef.h"
19 #include "llvm/IR/DebugInfo.h"
20 #include "llvm/Support/Dwarf.h"
31 class DwarfCompileUnit : public DwarfUnit {
32 /// The attribute index of DW_AT_stmt_list in the compile unit DIE, avoiding
33 /// the need to search for it in applyStmtList.
34 DIE::value_iterator StmtListValue;
36 /// Skeleton unit associated with this unit.
37 DwarfCompileUnit *Skeleton;
39 /// The start of the unit within its section.
42 /// GlobalNames - A map of globally visible named entities for this unit.
43 StringMap<const DIE *> GlobalNames;
45 /// GlobalTypes - A map of globally visible types for this unit.
46 StringMap<const DIE *> GlobalTypes;
48 // List of range lists for a given compile unit, separate from the ranges for
50 SmallVector<RangeSpanList, 1> CURangeLists;
52 // List of ranges for a given compile unit.
53 SmallVector<RangeSpan, 2> CURanges;
55 // The base address of this unit, if any. Used for relative references in
57 const MCSymbol *BaseAddress;
59 /// \brief Construct a DIE for the given DbgVariable without initializing the
60 /// DbgVariable's DIE reference.
61 DIE *constructVariableDIEImpl(const DbgVariable &DV, bool Abstract);
63 bool isDwoUnit() const override;
65 bool includeMinimalInlineScopes() const;
68 DwarfCompileUnit(unsigned UID, const DICompileUnit *Node, AsmPrinter *A,
69 DwarfDebug *DW, DwarfFile *DWU);
71 DwarfCompileUnit *getSkeleton() const {
77 /// Apply the DW_AT_stmt_list from this compile unit to the specified DIE.
78 void applyStmtList(DIE &D);
80 /// Get or create global variable DIE.
81 /// \param GV Global Variable Node
82 /// \param ContextDIE DIE scope for GV Node, if available.
83 DIE *getOrCreateGlobalVariableDIE(const DIGlobalVariable *GV,
84 DIE *ContextDIE = nullptr);
86 /// addLabelAddress - Add a dwarf label attribute data and value using
87 /// either DW_FORM_addr or DW_FORM_GNU_addr_index.
88 void addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
89 const MCSymbol *Label);
91 /// addLocalLabelAddress - Add a dwarf label attribute data and value using
92 /// DW_FORM_addr only.
93 void addLocalLabelAddress(DIE &Die, dwarf::Attribute Attribute,
94 const MCSymbol *Label);
96 /// addSectionDelta - Add a label delta attribute data and value.
97 DIE::value_iterator addSectionDelta(DIE &Die, dwarf::Attribute Attribute,
98 const MCSymbol *Hi, const MCSymbol *Lo);
100 DwarfCompileUnit &getCU() override { return *this; }
102 unsigned getOrCreateSourceID(StringRef FileName, StringRef DirName) override;
104 /// addRange - Add an address range to the list of ranges for this unit.
105 void addRange(RangeSpan Range);
107 void attachLowHighPC(DIE &D, const MCSymbol *Begin, const MCSymbol *End);
109 /// addSectionLabel - Add a Dwarf section label attribute data and value.
111 DIE::value_iterator addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
112 const MCSymbol *Label,
113 const MCSymbol *Sec);
115 /// \brief Find DIE for the given subprogram and attach appropriate
116 /// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global
117 /// variables in this scope then create and insert DIEs for these
119 DIE &updateSubprogramScopeDIE(const DISubprogram *SP);
121 void constructScopeDIE(LexicalScope *Scope,
122 SmallVectorImpl<DIE *> &FinalChildren);
124 /// \brief A helper function to construct a RangeSpanList for a given
126 void addScopeRangeList(DIE &ScopeDIE, SmallVector<RangeSpan, 2> Range);
128 void attachRangesOrLowHighPC(DIE &D, SmallVector<RangeSpan, 2> Ranges);
130 void attachRangesOrLowHighPC(DIE &D,
131 const SmallVectorImpl<InsnRange> &Ranges);
132 /// \brief This scope represents inlined body of a function. Construct
133 /// DIE to represent this concrete inlined copy of the function.
134 DIE *constructInlinedScopeDIE(LexicalScope *Scope);
136 /// \brief Construct new DW_TAG_lexical_block for this scope and
137 /// attach DW_AT_low_pc/DW_AT_high_pc labels.
138 DIE *constructLexicalScopeDIE(LexicalScope *Scope);
140 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
141 DIE *constructVariableDIE(DbgVariable &DV, bool Abstract = false);
143 DIE *constructVariableDIE(DbgVariable &DV, const LexicalScope &Scope,
144 DIE *&ObjectPointer);
146 /// A helper function to create children of a Scope DIE.
147 DIE *createScopeChildrenDIE(LexicalScope *Scope,
148 SmallVectorImpl<DIE *> &Children,
149 unsigned *ChildScopeCount = nullptr);
151 /// \brief Construct a DIE for this subprogram scope.
152 void constructSubprogramScopeDIE(LexicalScope *Scope);
154 DIE *createAndAddScopeChildren(LexicalScope *Scope, DIE &ScopeDIE);
156 void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
158 /// \brief Construct import_module DIE.
159 DIE *constructImportedEntityDIE(const DIImportedEntity *Module);
161 void finishSubprogramDefinition(const DISubprogram *SP);
163 void collectDeadVariables(const DISubprogram *SP);
165 /// Set the skeleton unit associated with this unit.
166 void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
168 const MCSymbol *getSectionSym() const {
170 return Section->getBeginSymbol();
173 unsigned getLength() {
174 return sizeof(uint32_t) + // Length field
175 getHeaderSize() + UnitDie.getSize();
178 void emitHeader(bool UseOffsets) override;
180 MCSymbol *getLabelBegin() const {
185 /// Add a new global name to the compile unit.
186 void addGlobalName(StringRef Name, DIE &Die, const DIScope *Context) override;
188 /// Add a new global type to the compile unit.
189 void addGlobalType(const DIType *Ty, const DIE &Die,
190 const DIScope *Context) override;
192 const StringMap<const DIE *> &getGlobalNames() const { return GlobalNames; }
193 const StringMap<const DIE *> &getGlobalTypes() const { return GlobalTypes; }
195 /// Add DW_AT_location attribute for a DbgVariable based on provided
197 void addVariableAddress(const DbgVariable &DV, DIE &Die,
198 MachineLocation Location);
199 /// Add an address attribute to a die based on the location provided.
200 void addAddress(DIE &Die, dwarf::Attribute Attribute,
201 const MachineLocation &Location);
203 /// Start with the address based on the location provided, and generate the
204 /// DWARF information necessary to find the actual variable (navigating the
205 /// extra location information encoded in the type) based on the starting
206 /// location. Add the DWARF information to the die.
207 void addComplexAddress(const DbgVariable &DV, DIE &Die,
208 dwarf::Attribute Attribute,
209 const MachineLocation &Location);
211 /// Add a Dwarf loclistptr attribute data and value.
212 void addLocationList(DIE &Die, dwarf::Attribute Attribute, unsigned Index);
213 void applyVariableAttributes(const DbgVariable &Var, DIE &VariableDie);
215 /// Add a Dwarf expression attribute data and value.
216 void addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr);
218 void applySubprogramAttributesToDefinition(const DISubprogram *SP,
221 /// getRangeLists - Get the vector of range lists.
222 const SmallVectorImpl<RangeSpanList> &getRangeLists() const {
223 return (Skeleton ? Skeleton : this)->CURangeLists;
226 /// getRanges - Get the list of ranges for this unit.
227 const SmallVectorImpl<RangeSpan> &getRanges() const { return CURanges; }
228 SmallVector<RangeSpan, 2> takeRanges() { return std::move(CURanges); }
230 void setBaseAddress(const MCSymbol *Base) { BaseAddress = Base; }
231 const MCSymbol *getBaseAddress() const { return BaseAddress; }
234 } // end llvm namespace