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/Support/Dwarf.h"
19 #include "llvm/ADT/StringRef.h"
20 #include "llvm/IR/DebugInfo.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 unsigned stmtListIndex;
36 /// Skeleton unit associated with this unit.
37 DwarfCompileUnit *Skeleton;
39 /// A label at the start of the non-dwo section related to this unit.
42 /// The start of the unit within its section.
45 /// GlobalNames - A map of globally visible named entities for this unit.
46 StringMap<const DIE *> GlobalNames;
48 /// GlobalTypes - A map of globally visible types for this unit.
49 StringMap<const DIE *> GlobalTypes;
51 // List of range lists for a given compile unit, separate from the ranges for
53 SmallVector<RangeSpanList, 1> CURangeLists;
55 /// \brief Construct a DIE for the given DbgVariable without initializing the
56 /// DbgVariable's DIE reference.
57 std::unique_ptr<DIE> constructVariableDIEImpl(const DbgVariable &DV,
60 bool isDwoUnit() const override;
63 DwarfCompileUnit(unsigned UID, DICompileUnit Node, AsmPrinter *A,
64 DwarfDebug *DW, DwarfFile *DWU);
66 DwarfCompileUnit *getSkeleton() const {
70 void initStmtList(MCSymbol *DwarfLineSectionSym);
72 /// Apply the DW_AT_stmt_list from this compile unit to the specified DIE.
73 void applyStmtList(DIE &D);
75 /// getOrCreateGlobalVariableDIE - get or create global variable DIE.
76 DIE *getOrCreateGlobalVariableDIE(DIGlobalVariable GV);
78 /// addLabelAddress - Add a dwarf label attribute data and value using
79 /// either DW_FORM_addr or DW_FORM_GNU_addr_index.
80 void addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
81 const MCSymbol *Label);
83 /// addLocalLabelAddress - Add a dwarf label attribute data and value using
84 /// DW_FORM_addr only.
85 void addLocalLabelAddress(DIE &Die, dwarf::Attribute Attribute,
86 const MCSymbol *Label);
88 /// addSectionDelta - Add a label delta attribute data and value.
89 void addSectionDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi,
92 DwarfCompileUnit &getCU() override { return *this; }
94 unsigned getOrCreateSourceID(StringRef FileName, StringRef DirName) override;
96 /// addRange - Add an address range to the list of ranges for this unit.
97 void addRange(RangeSpan Range);
99 void attachLowHighPC(DIE &D, const MCSymbol *Begin, const MCSymbol *End);
101 /// addSectionLabel - Add a Dwarf section label attribute data and value.
103 void addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
104 const MCSymbol *Label, const MCSymbol *Sec);
106 /// \brief Find DIE for the given subprogram and attach appropriate
107 /// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global
108 /// variables in this scope then create and insert DIEs for these
110 DIE &updateSubprogramScopeDIE(DISubprogram SP);
112 void constructScopeDIE(LexicalScope *Scope,
113 SmallVectorImpl<std::unique_ptr<DIE>> &FinalChildren);
115 /// \brief A helper function to construct a RangeSpanList for a given
117 void addScopeRangeList(DIE &ScopeDIE,
118 const SmallVectorImpl<InsnRange> &Range);
120 void attachRangesOrLowHighPC(DIE &D,
121 const SmallVectorImpl<InsnRange> &Ranges);
123 /// \brief This scope represents inlined body of a function. Construct
124 /// DIE to represent this concrete inlined copy of the function.
125 std::unique_ptr<DIE> constructInlinedScopeDIE(LexicalScope *Scope);
127 /// \brief Construct new DW_TAG_lexical_block for this scope and
128 /// attach DW_AT_low_pc/DW_AT_high_pc labels.
129 std::unique_ptr<DIE> constructLexicalScopeDIE(LexicalScope *Scope);
131 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
132 std::unique_ptr<DIE> constructVariableDIE(DbgVariable &DV,
133 bool Abstract = false);
135 std::unique_ptr<DIE> constructVariableDIE(DbgVariable &DV,
136 const LexicalScope &Scope,
137 DIE *&ObjectPointer);
139 /// A helper function to create children of a Scope DIE.
140 DIE *createScopeChildrenDIE(LexicalScope *Scope,
141 SmallVectorImpl<std::unique_ptr<DIE>> &Children,
142 unsigned *ChildScopeCount = nullptr);
144 /// \brief Construct a DIE for this subprogram scope.
145 void constructSubprogramScopeDIE(LexicalScope *Scope);
147 DIE *createAndAddScopeChildren(LexicalScope *Scope, DIE &ScopeDIE);
149 void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
151 /// \brief Construct import_module DIE.
153 constructImportedEntityDIE(const DIImportedEntity &Module);
155 void finishSubprogramDefinition(DISubprogram SP);
157 void collectDeadVariables(DISubprogram SP);
159 /// Set the skeleton unit associated with this unit.
160 void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
162 MCSymbol *getSectionSym() const {
167 /// Pass in the SectionSym even though we could recreate it in every compile
168 /// unit (type units will have actually distinct symbols once they're in
169 /// comdat sections).
170 void initSection(const MCSection *Section, MCSymbol *SectionSym) {
171 DwarfUnit::initSection(Section);
172 this->SectionSym = SectionSym;
174 // Don't bother labeling the .dwo unit, as its offset isn't used.
177 Asm->GetTempSymbol(Section->getLabelBeginName(), getUniqueID());
180 unsigned getLength() {
181 return sizeof(uint32_t) + // Length field
182 getHeaderSize() + UnitDie.getSize();
185 void emitHeader(const MCSymbol *ASectionSym) const override;
187 MCSymbol *getLabelBegin() const {
192 /// Add a new global name to the compile unit.
193 void addGlobalName(StringRef Name, DIE &Die, DIScope Context) override;
195 /// Add a new global type to the compile unit.
196 void addGlobalType(DIType Ty, const DIE &Die, DIScope Context) override;
198 const StringMap<const DIE *> &getGlobalNames() const { return GlobalNames; }
199 const StringMap<const DIE *> &getGlobalTypes() const { return GlobalTypes; }
201 /// Add DW_AT_location attribute for a DbgVariable based on provided
203 void addVariableAddress(const DbgVariable &DV, DIE &Die,
204 MachineLocation Location);
205 /// Add an address attribute to a die based on the location provided.
206 void addAddress(DIE &Die, dwarf::Attribute Attribute,
207 const MachineLocation &Location, bool Indirect = false);
209 /// Start with the address based on the location provided, and generate the
210 /// DWARF information necessary to find the actual variable (navigating the
211 /// extra location information encoded in the type) based on the starting
212 /// location. Add the DWARF information to the die.
213 void addComplexAddress(const DbgVariable &DV, DIE &Die,
214 dwarf::Attribute Attribute,
215 const MachineLocation &Location);
217 /// Add a Dwarf loclistptr attribute data and value.
218 void addLocationList(DIE &Die, dwarf::Attribute Attribute, unsigned Index);
219 void applyVariableAttributes(const DbgVariable &Var, DIE &VariableDie);
221 /// Add a Dwarf expression attribute data and value.
222 void addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr);
224 void applySubprogramAttributesToDefinition(DISubprogram SP, DIE &SPDie);
226 /// addRangeList - Add an address range list to the list of range lists.
227 void addRangeList(RangeSpanList Ranges) {
228 CURangeLists.push_back(std::move(Ranges));
231 /// getRangeLists - Get the vector of range lists.
232 const SmallVectorImpl<RangeSpanList> &getRangeLists() const {
235 SmallVectorImpl<RangeSpanList> &getRangeLists() { return CURangeLists; }
238 } // end llvm namespace