LCOV - code coverage report
Current view: top level - lib/CodeGen/AsmPrinter - CodeViewDebug.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 8 8 100.0 %
Date: 2018-09-23 13:06:45 Functions: 2 2 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h --------------*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file contains support for writing Microsoft CodeView debug info.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
      15             : #define LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
      16             : 
      17             : #include "DbgEntityHistoryCalculator.h"
      18             : #include "DebugHandlerBase.h"
      19             : #include "llvm/ADT/ArrayRef.h"
      20             : #include "llvm/ADT/DenseMap.h"
      21             : #include "llvm/ADT/DenseSet.h"
      22             : #include "llvm/ADT/MapVector.h"
      23             : #include "llvm/ADT/SetVector.h"
      24             : #include "llvm/ADT/SmallVector.h"
      25             : #include "llvm/DebugInfo/CodeView/CodeView.h"
      26             : #include "llvm/DebugInfo/CodeView/GlobalTypeTableBuilder.h"
      27             : #include "llvm/DebugInfo/CodeView/TypeIndex.h"
      28             : #include "llvm/IR/DebugLoc.h"
      29             : #include "llvm/Support/Allocator.h"
      30             : #include "llvm/Support/Compiler.h"
      31             : #include <cstdint>
      32             : #include <map>
      33             : #include <string>
      34             : #include <tuple>
      35             : #include <unordered_map>
      36             : #include <utility>
      37             : #include <vector>
      38             : 
      39             : namespace llvm {
      40             : 
      41             : struct ClassInfo;
      42             : class StringRef;
      43             : class AsmPrinter;
      44             : class Function;
      45             : class GlobalVariable;
      46             : class MCSectionCOFF;
      47             : class MCStreamer;
      48             : class MCSymbol;
      49             : class MachineFunction;
      50             : 
      51             : /// Collects and handles line tables information in a CodeView format.
      52             : class LLVM_LIBRARY_VISIBILITY CodeViewDebug : public DebugHandlerBase {
      53             :   MCStreamer &OS;
      54             :   BumpPtrAllocator Allocator;
      55             :   codeview::GlobalTypeTableBuilder TypeTable;
      56             : 
      57             :   /// Represents the most general definition range.
      58         965 :   struct LocalVarDefRange {
      59             :     /// Indicates that variable data is stored in memory relative to the
      60             :     /// specified register.
      61             :     int InMemory : 1;
      62             : 
      63             :     /// Offset of variable data in memory.
      64             :     int DataOffset : 31;
      65             : 
      66             :     /// Non-zero if this is a piece of an aggregate.
      67             :     uint16_t IsSubfield : 1;
      68             : 
      69             :     /// Offset into aggregate.
      70             :     uint16_t StructOffset : 15;
      71             : 
      72             :     /// Register containing the data or the register base of the memory
      73             :     /// location containing the data.
      74             :     uint16_t CVRegister;
      75             : 
      76             :     /// Compares all location fields. This includes all fields except the label
      77             :     /// ranges.
      78          42 :     bool isDifferentLocation(LocalVarDefRange &O) {
      79          36 :       return InMemory != O.InMemory || DataOffset != O.DataOffset ||
      80          78 :              IsSubfield != O.IsSubfield || StructOffset != O.StructOffset ||
      81          30 :              CVRegister != O.CVRegister;
      82             :     }
      83             : 
      84             :     SmallVector<std::pair<const MCSymbol *, const MCSymbol *>, 1> Ranges;
      85             :   };
      86             : 
      87             :   static LocalVarDefRange createDefRangeMem(uint16_t CVRegister, int Offset);
      88             : 
      89             :   /// Similar to DbgVariable in DwarfDebug, but not dwarf-specific.
      90        2408 :   struct LocalVariable {
      91             :     const DILocalVariable *DIVar = nullptr;
      92             :     SmallVector<LocalVarDefRange, 1> DefRanges;
      93             :     bool UseReferenceType = false;
      94             :   };
      95             : 
      96             :   struct InlineSite {
      97             :     SmallVector<LocalVariable, 1> InlinedLocals;
      98             :     SmallVector<const DILocation *, 1> ChildSites;
      99             :     const DISubprogram *Inlinee = nullptr;
     100             : 
     101             :     /// The ID of the inline site or function used with .cv_loc. Not a type
     102             :     /// index.
     103             :     unsigned SiteFuncId = 0;
     104             :   };
     105             : 
     106             :   // Combines information from DILexicalBlock and LexicalScope.
     107             :   struct LexicalBlock {
     108             :     SmallVector<LocalVariable, 1> Locals;
     109             :     SmallVector<LexicalBlock *, 1> Children;
     110             :     const MCSymbol *Begin;
     111             :     const MCSymbol *End;
     112             :     StringRef Name;
     113             :   };
     114             : 
     115             :   // For each function, store a vector of labels to its instructions, as well as
     116             :   // to the end of the function.
     117             :   struct FunctionInfo {
     118             :     FunctionInfo() = default;
     119             : 
     120             :     // Uncopyable.
     121             :     FunctionInfo(const FunctionInfo &FI) = delete;
     122             : 
     123             :     /// Map from inlined call site to inlined instructions and child inlined
     124             :     /// call sites. Listed in program order.
     125             :     std::unordered_map<const DILocation *, InlineSite> InlineSites;
     126             : 
     127             :     /// Ordered list of top-level inlined call sites.
     128             :     SmallVector<const DILocation *, 1> ChildSites;
     129             : 
     130             :     SmallVector<LocalVariable, 1> Locals;
     131             : 
     132             :     std::unordered_map<const DILexicalBlockBase*, LexicalBlock> LexicalBlocks;
     133             : 
     134             :     // Lexical blocks containing local variables.
     135             :     SmallVector<LexicalBlock *, 1> ChildBlocks;
     136             : 
     137             :     std::vector<std::pair<MCSymbol *, MDNode *>> Annotations;
     138             : 
     139             :     const MCSymbol *Begin = nullptr;
     140             :     const MCSymbol *End = nullptr;
     141             :     unsigned FuncId = 0;
     142             :     unsigned LastFileId = 0;
     143             :     bool HaveLineInfo = false;
     144             :   };
     145             :   FunctionInfo *CurFn = nullptr;
     146             : 
     147             :   // Map used to seperate variables according to the lexical scope they belong
     148             :   // in.  This is populated by recordLocalVariable() before
     149             :   // collectLexicalBlocks() separates the variables between the FunctionInfo
     150             :   // and LexicalBlocks.
     151             :   DenseMap<const LexicalScope *, SmallVector<LocalVariable, 1>> ScopeVariables;
     152             : 
     153             :   /// The set of comdat .debug$S sections that we've seen so far. Each section
     154             :   /// must start with a magic version number that must only be emitted once.
     155             :   /// This set tracks which sections we've already opened.
     156             :   DenseSet<MCSectionCOFF *> ComdatDebugSections;
     157             : 
     158             :   /// Switch to the appropriate .debug$S section for GVSym. If GVSym, the symbol
     159             :   /// of an emitted global value, is in a comdat COFF section, this will switch
     160             :   /// to a new .debug$S section in that comdat. This method ensures that the
     161             :   /// section starts with the magic version number on first use. If GVSym is
     162             :   /// null, uses the main .debug$S section.
     163             :   void switchToDebugSectionForSymbol(const MCSymbol *GVSym);
     164             : 
     165             :   /// The next available function index for use with our .cv_* directives. Not
     166             :   /// to be confused with type indices for LF_FUNC_ID records.
     167             :   unsigned NextFuncId = 0;
     168             : 
     169             :   InlineSite &getInlineSite(const DILocation *InlinedAt,
     170             :                             const DISubprogram *Inlinee);
     171             : 
     172             :   codeview::TypeIndex getFuncIdForSubprogram(const DISubprogram *SP);
     173             : 
     174             :   void calculateRanges(LocalVariable &Var,
     175             :                        const DbgValueHistoryMap::InstrRanges &Ranges);
     176             : 
     177             :   static void collectInlineSiteChildren(SmallVectorImpl<unsigned> &Children,
     178             :                                         const FunctionInfo &FI,
     179             :                                         const InlineSite &Site);
     180             : 
     181             :   /// Remember some debug info about each function. Keep it in a stable order to
     182             :   /// emit at the end of the TU.
     183             :   MapVector<const Function *, std::unique_ptr<FunctionInfo>> FnDebugInfo;
     184             : 
     185             :   /// Map from full file path to .cv_file id. Full paths are built from DIFiles
     186             :   /// and are stored in FileToFilepathMap;
     187             :   DenseMap<StringRef, unsigned> FileIdMap;
     188             : 
     189             :   /// All inlined subprograms in the order they should be emitted.
     190             :   SmallSetVector<const DISubprogram *, 4> InlinedSubprograms;
     191             : 
     192             :   /// Map from a pair of DI metadata nodes and its DI type (or scope) that can
     193             :   /// be nullptr, to CodeView type indices. Primarily indexed by
     194             :   /// {DIType*, DIType*} and {DISubprogram*, DIType*}.
     195             :   ///
     196             :   /// The second entry in the key is needed for methods as DISubroutineType
     197             :   /// representing static method type are shared with non-method function type.
     198             :   DenseMap<std::pair<const DINode *, const DIType *>, codeview::TypeIndex>
     199             :       TypeIndices;
     200             : 
     201             :   /// Map from DICompositeType* to complete type index. Non-record types are
     202             :   /// always looked up in the normal TypeIndices map.
     203             :   DenseMap<const DICompositeType *, codeview::TypeIndex> CompleteTypeIndices;
     204             : 
     205             :   /// Complete record types to emit after all active type lowerings are
     206             :   /// finished.
     207             :   SmallVector<const DICompositeType *, 4> DeferredCompleteTypes;
     208             : 
     209             :   /// Number of type lowering frames active on the stack.
     210             :   unsigned TypeEmissionLevel = 0;
     211             : 
     212             :   codeview::TypeIndex VBPType;
     213             : 
     214             :   const DISubprogram *CurrentSubprogram = nullptr;
     215             : 
     216             :   // The UDTs we have seen while processing types; each entry is a pair of type
     217             :   // index and type name.
     218             :   std::vector<std::pair<std::string, const DIType *>> LocalUDTs;
     219             :   std::vector<std::pair<std::string, const DIType *>> GlobalUDTs;
     220             : 
     221             :   using FileToFilepathMapTy = std::map<const DIFile *, std::string>;
     222             :   FileToFilepathMapTy FileToFilepathMap;
     223             : 
     224             :   StringRef getFullFilepath(const DIFile *File);
     225             : 
     226             :   unsigned maybeRecordFile(const DIFile *F);
     227             : 
     228             :   void maybeRecordLocation(const DebugLoc &DL, const MachineFunction *MF);
     229             : 
     230             :   void clear();
     231             : 
     232             :   void setCurrentSubprogram(const DISubprogram *SP) {
     233         329 :     CurrentSubprogram = SP;
     234             :     LocalUDTs.clear();
     235             :   }
     236             : 
     237             :   /// Emit the magic version number at the start of a CodeView type or symbol
     238             :   /// section. Appears at the front of every .debug$S or .debug$T or .debug$P
     239             :   /// section.
     240             :   void emitCodeViewMagicVersion();
     241             : 
     242             :   void emitTypeInformation();
     243             : 
     244             :   void emitTypeGlobalHashes();
     245             : 
     246             :   void emitCompilerInformation();
     247             : 
     248             :   void emitInlineeLinesSubsection();
     249             : 
     250             :   void emitDebugInfoForThunk(const Function *GV,
     251             :                              FunctionInfo &FI,
     252             :                              const MCSymbol *Fn);
     253             : 
     254             :   void emitDebugInfoForFunction(const Function *GV, FunctionInfo &FI);
     255             : 
     256             :   void emitDebugInfoForGlobals();
     257             : 
     258             :   void emitDebugInfoForRetainedTypes();
     259             : 
     260             :   void
     261             :   emitDebugInfoForUDTs(ArrayRef<std::pair<std::string, const DIType *>> UDTs);
     262             : 
     263             :   void emitDebugInfoForGlobal(const DIGlobalVariable *DIGV,
     264             :                               const GlobalVariable *GV, MCSymbol *GVSym);
     265             : 
     266             :   /// Opens a subsection of the given kind in a .debug$S codeview section.
     267             :   /// Returns an end label for use with endCVSubsection when the subsection is
     268             :   /// finished.
     269             :   MCSymbol *beginCVSubsection(codeview::DebugSubsectionKind Kind);
     270             : 
     271             :   void endCVSubsection(MCSymbol *EndLabel);
     272             : 
     273             :   void emitInlinedCallSite(const FunctionInfo &FI, const DILocation *InlinedAt,
     274             :                            const InlineSite &Site);
     275             : 
     276             :   using InlinedEntity = DbgValueHistoryMap::InlinedEntity;
     277             : 
     278             :   void collectVariableInfo(const DISubprogram *SP);
     279             : 
     280             :   void collectVariableInfoFromMFTable(DenseSet<InlinedEntity> &Processed);
     281             : 
     282             :   // Construct the lexical block tree for a routine, pruning emptpy lexical
     283             :   // scopes, and populate it with local variables.
     284             :   void collectLexicalBlockInfo(SmallVectorImpl<LexicalScope *> &Scopes,
     285             :                                SmallVectorImpl<LexicalBlock *> &Blocks,
     286             :                                SmallVectorImpl<LocalVariable> &Locals);
     287             :   void collectLexicalBlockInfo(LexicalScope &Scope,
     288             :                                SmallVectorImpl<LexicalBlock *> &ParentBlocks,
     289             :                                SmallVectorImpl<LocalVariable> &ParentLocals);
     290             : 
     291             :   /// Records information about a local variable in the appropriate scope. In
     292             :   /// particular, locals from inlined code live inside the inlining site.
     293             :   void recordLocalVariable(LocalVariable &&Var, const LexicalScope *LS);
     294             : 
     295             :   /// Emits local variables in the appropriate order.
     296             :   void emitLocalVariableList(ArrayRef<LocalVariable> Locals);
     297             : 
     298             :   /// Emits an S_LOCAL record and its associated defined ranges.
     299             :   void emitLocalVariable(const LocalVariable &Var);
     300             : 
     301             :   /// Emits a sequence of lexical block scopes and their children.
     302             :   void emitLexicalBlockList(ArrayRef<LexicalBlock *> Blocks,
     303             :                             const FunctionInfo& FI);
     304             : 
     305             :   /// Emit a lexical block scope and its children.
     306             :   void emitLexicalBlock(const LexicalBlock &Block, const FunctionInfo& FI);
     307             : 
     308             :   /// Translates the DIType to codeview if necessary and returns a type index
     309             :   /// for it.
     310             :   codeview::TypeIndex getTypeIndex(DITypeRef TypeRef,
     311             :                                    DITypeRef ClassTyRef = DITypeRef());
     312             : 
     313             :   codeview::TypeIndex getTypeIndexForReferenceTo(DITypeRef TypeRef);
     314             : 
     315             :   codeview::TypeIndex getMemberFunctionType(const DISubprogram *SP,
     316             :                                             const DICompositeType *Class);
     317             : 
     318             :   codeview::TypeIndex getScopeIndex(const DIScope *Scope);
     319             : 
     320             :   codeview::TypeIndex getVBPTypeIndex();
     321             : 
     322             :   void addToUDTs(const DIType *Ty);
     323             : 
     324             :   void addUDTSrcLine(const DIType *Ty, codeview::TypeIndex TI);
     325             : 
     326             :   codeview::TypeIndex lowerType(const DIType *Ty, const DIType *ClassTy);
     327             :   codeview::TypeIndex lowerTypeAlias(const DIDerivedType *Ty);
     328             :   codeview::TypeIndex lowerTypeArray(const DICompositeType *Ty);
     329             :   codeview::TypeIndex lowerTypeBasic(const DIBasicType *Ty);
     330             :   codeview::TypeIndex lowerTypePointer(
     331             :       const DIDerivedType *Ty,
     332             :       codeview::PointerOptions PO = codeview::PointerOptions::None);
     333             :   codeview::TypeIndex lowerTypeMemberPointer(
     334             :       const DIDerivedType *Ty,
     335             :       codeview::PointerOptions PO = codeview::PointerOptions::None);
     336             :   codeview::TypeIndex lowerTypeModifier(const DIDerivedType *Ty);
     337             :   codeview::TypeIndex lowerTypeFunction(const DISubroutineType *Ty);
     338             :   codeview::TypeIndex lowerTypeVFTableShape(const DIDerivedType *Ty);
     339             :   codeview::TypeIndex lowerTypeMemberFunction(const DISubroutineType *Ty,
     340             :                                               const DIType *ClassTy,
     341             :                                               int ThisAdjustment,
     342             :                                               bool IsStaticMethod);
     343             :   codeview::TypeIndex lowerTypeEnum(const DICompositeType *Ty);
     344             :   codeview::TypeIndex lowerTypeClass(const DICompositeType *Ty);
     345             :   codeview::TypeIndex lowerTypeUnion(const DICompositeType *Ty);
     346             : 
     347             :   /// Symbol records should point to complete types, but type records should
     348             :   /// always point to incomplete types to avoid cycles in the type graph. Only
     349             :   /// use this entry point when generating symbol records. The complete and
     350             :   /// incomplete type indices only differ for record types. All other types use
     351             :   /// the same index.
     352             :   codeview::TypeIndex getCompleteTypeIndex(DITypeRef TypeRef);
     353             : 
     354             :   codeview::TypeIndex lowerCompleteTypeClass(const DICompositeType *Ty);
     355             :   codeview::TypeIndex lowerCompleteTypeUnion(const DICompositeType *Ty);
     356             : 
     357             :   struct TypeLoweringScope;
     358             : 
     359             :   void emitDeferredCompleteTypes();
     360             : 
     361             :   void collectMemberInfo(ClassInfo &Info, const DIDerivedType *DDTy);
     362             :   ClassInfo collectClassInfo(const DICompositeType *Ty);
     363             : 
     364             :   /// Common record member lowering functionality for record types, which are
     365             :   /// structs, classes, and unions. Returns the field list index and the member
     366             :   /// count.
     367             :   std::tuple<codeview::TypeIndex, codeview::TypeIndex, unsigned, bool>
     368             :   lowerRecordFieldList(const DICompositeType *Ty);
     369             : 
     370             :   /// Inserts {{Node, ClassTy}, TI} into TypeIndices and checks for duplicates.
     371             :   codeview::TypeIndex recordTypeIndexForDINode(const DINode *Node,
     372             :                                                codeview::TypeIndex TI,
     373             :                                                const DIType *ClassTy = nullptr);
     374             : 
     375             :   unsigned getPointerSizeInBytes();
     376             : 
     377             : protected:
     378             :   /// Gather pre-function debug information.
     379             :   void beginFunctionImpl(const MachineFunction *MF) override;
     380             : 
     381             :   /// Gather post-function debug information.
     382             :   void endFunctionImpl(const MachineFunction *) override;
     383             : 
     384             : public:
     385             :   CodeViewDebug(AsmPrinter *AP);
     386             : 
     387         174 :   void setSymbolSize(const MCSymbol *, uint64_t) override {}
     388             : 
     389             :   /// Emit the COFF section that holds the line table information.
     390             :   void endModule() override;
     391             : 
     392             :   /// Process beginning of an instruction.
     393             :   void beginInstruction(const MachineInstr *MI) override;
     394             : };
     395             : 
     396             : } // end namespace llvm
     397             : 
     398             : #endif // LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H

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