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 /// \brief Construct a DIE for the given DbgVariable without initializing the
43 /// DbgVariable's DIE reference.
44 std::unique_ptr<DIE> constructVariableDIEImpl(const DbgVariable &DV,
48 DwarfCompileUnit(unsigned UID, DICompileUnit Node, AsmPrinter *A,
49 DwarfDebug *DW, DwarfFile *DWU);
51 DwarfCompileUnit *getSkeleton() const {
55 void initStmtList(MCSymbol *DwarfLineSectionSym);
57 /// Apply the DW_AT_stmt_list from this compile unit to the specified DIE.
58 void applyStmtList(DIE &D);
60 /// getOrCreateGlobalVariableDIE - get or create global variable DIE.
61 DIE *getOrCreateGlobalVariableDIE(DIGlobalVariable GV);
63 /// addLabelAddress - Add a dwarf label attribute data and value using
64 /// either DW_FORM_addr or DW_FORM_GNU_addr_index.
65 void addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
66 const MCSymbol *Label);
68 /// addLocalLabelAddress - Add a dwarf label attribute data and value using
69 /// DW_FORM_addr only.
70 void addLocalLabelAddress(DIE &Die, dwarf::Attribute Attribute,
71 const MCSymbol *Label);
73 /// addSectionDelta - Add a label delta attribute data and value.
74 void addSectionDelta(DIE &Die, dwarf::Attribute Attribute, const MCSymbol *Hi,
77 DwarfCompileUnit &getCU() override { return *this; }
79 unsigned getOrCreateSourceID(StringRef FileName, StringRef DirName) override;
81 /// addRange - Add an address range to the list of ranges for this unit.
82 void addRange(RangeSpan Range);
84 void attachLowHighPC(DIE &D, const MCSymbol *Begin, const MCSymbol *End);
86 /// addSectionLabel - Add a Dwarf section label attribute data and value.
88 void addSectionLabel(DIE &Die, dwarf::Attribute Attribute,
89 const MCSymbol *Label, const MCSymbol *Sec);
91 /// \brief Find DIE for the given subprogram and attach appropriate
92 /// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global
93 /// variables in this scope then create and insert DIEs for these
95 DIE &updateSubprogramScopeDIE(DISubprogram SP);
97 void constructScopeDIE(LexicalScope *Scope,
98 SmallVectorImpl<std::unique_ptr<DIE>> &FinalChildren);
100 /// \brief A helper function to construct a RangeSpanList for a given
102 void addScopeRangeList(DIE &ScopeDIE,
103 const SmallVectorImpl<InsnRange> &Range);
105 void attachRangesOrLowHighPC(DIE &D,
106 const SmallVectorImpl<InsnRange> &Ranges);
108 /// \brief This scope represents inlined body of a function. Construct
109 /// DIE to represent this concrete inlined copy of the function.
110 std::unique_ptr<DIE> constructInlinedScopeDIE(LexicalScope *Scope);
112 /// \brief Construct new DW_TAG_lexical_block for this scope and
113 /// attach DW_AT_low_pc/DW_AT_high_pc labels.
114 std::unique_ptr<DIE> constructLexicalScopeDIE(LexicalScope *Scope);
116 /// constructVariableDIE - Construct a DIE for the given DbgVariable.
117 std::unique_ptr<DIE> constructVariableDIE(DbgVariable &DV,
118 bool Abstract = false);
120 std::unique_ptr<DIE> constructVariableDIE(DbgVariable &DV,
121 const LexicalScope &Scope,
122 DIE *&ObjectPointer);
124 /// A helper function to create children of a Scope DIE.
125 DIE *createScopeChildrenDIE(LexicalScope *Scope,
126 SmallVectorImpl<std::unique_ptr<DIE>> &Children,
127 unsigned *ChildScopeCount = nullptr);
129 /// \brief Construct a DIE for this subprogram scope.
130 void constructSubprogramScopeDIE(LexicalScope *Scope);
132 DIE *createAndAddScopeChildren(LexicalScope *Scope, DIE &ScopeDIE);
134 void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
136 /// \brief Construct import_module DIE.
138 constructImportedEntityDIE(const DIImportedEntity &Module);
140 void finishSubprogramDefinition(DISubprogram SP);
142 void collectDeadVariables(DISubprogram SP);
144 /// If there's a skeleton then return the begin label for the skeleton unit,
145 /// otherwise return the local label for this unit.
146 MCSymbol *getLocalLabelBegin() const {
148 return Skeleton->getLabelBegin();
149 return getLabelBegin();
152 /// If there's a skeleton then return the section symbol for the skeleton
153 /// unit, otherwise return the section symbol for this unit.
154 MCSymbol *getLocalSectionSym() const {
156 return Skeleton->getSectionSym();
157 return getSectionSym();
160 /// Set the skeleton unit associated with this unit.
161 void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
163 MCSymbol *getSectionSym() const {
168 /// Pass in the SectionSym even though we could recreate it in every compile
169 /// unit (type units will have actually distinct symbols once they're in
170 /// comdat sections).
171 void initSection(const MCSection *Section, MCSymbol *SectionSym) {
172 DwarfUnit::initSection(Section);
173 this->SectionSym = SectionSym;
176 unsigned getLength() {
177 return sizeof(uint32_t) + // Length field
178 getHeaderSize() + UnitDie.getSize();
181 void emitHeader(const MCSymbol *ASectionSym) const override;
184 } // end llvm namespace