LCOV - code coverage report
Current view: top level - lib/CodeGen/AsmPrinter - CodeViewDebug.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 12 12 100.0 %
Date: 2017-09-14 15:23:50 Functions: 12 13 92.3 %
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 "DbgValueHistoryCalculator.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/TypeIndex.h"
      27             : #include "llvm/DebugInfo/CodeView/TypeTableBuilder.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             : /// \brief Collects and handles line tables information in a CodeView format.
      52        1034 : class LLVM_LIBRARY_VISIBILITY CodeViewDebug : public DebugHandlerBase {
      53             :   MCStreamer &OS;
      54             :   BumpPtrAllocator Allocator;
      55             :   codeview::TypeTableBuilder TypeTable;
      56             : 
      57             :   /// Represents the most general definition range.
      58        2288 :   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          25 :     bool isDifferentLocation(LocalVarDefRange &O) {
      79          71 :       return InMemory != O.InMemory || DataOffset != O.DataOffset ||
      80          92 :              IsSubfield != O.IsSubfield || StructOffset != O.StructOffset ||
      81          46 :              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             :   static LocalVarDefRange createDefRangeGeneral(uint16_t CVRegister,
      89             :                                                 bool InMemory, int Offset,
      90             :                                                 bool IsSubfield,
      91             :                                                 uint16_t StructOffset);
      92             : 
      93             :   /// Similar to DbgVariable in DwarfDebug, but not dwarf-specific.
      94        1580 :   struct LocalVariable {
      95             :     const DILocalVariable *DIVar = nullptr;
      96             :     SmallVector<LocalVarDefRange, 1> DefRanges;
      97             :     bool UseReferenceType = false;
      98             :   };
      99             : 
     100        1440 :   struct InlineSite {
     101             :     SmallVector<LocalVariable, 1> InlinedLocals;
     102             :     SmallVector<const DILocation *, 1> ChildSites;
     103             :     const DISubprogram *Inlinee = nullptr;
     104             : 
     105             :     /// The ID of the inline site or function used with .cv_loc. Not a type
     106             :     /// index.
     107             :     unsigned SiteFuncId = 0;
     108             :   };
     109             : 
     110             :   // For each function, store a vector of labels to its instructions, as well as
     111             :   // to the end of the function.
     112        4527 :   struct FunctionInfo {
     113             :     /// Map from inlined call site to inlined instructions and child inlined
     114             :     /// call sites. Listed in program order.
     115             :     std::unordered_map<const DILocation *, InlineSite> InlineSites;
     116             : 
     117             :     /// Ordered list of top-level inlined call sites.
     118             :     SmallVector<const DILocation *, 1> ChildSites;
     119             : 
     120             :     SmallVector<LocalVariable, 1> Locals;
     121             : 
     122             :     std::vector<std::pair<MCSymbol *, MDNode *>> Annotations;
     123             : 
     124             :     const MCSymbol *Begin = nullptr;
     125             :     const MCSymbol *End = nullptr;
     126             :     unsigned FuncId = 0;
     127             :     unsigned LastFileId = 0;
     128             :     bool HaveLineInfo = false;
     129             :   };
     130             :   FunctionInfo *CurFn = nullptr;
     131             : 
     132             :   /// The set of comdat .debug$S sections that we've seen so far. Each section
     133             :   /// must start with a magic version number that must only be emitted once.
     134             :   /// This set tracks which sections we've already opened.
     135             :   DenseSet<MCSectionCOFF *> ComdatDebugSections;
     136             : 
     137             :   /// Switch to the appropriate .debug$S section for GVSym. If GVSym, the symbol
     138             :   /// of an emitted global value, is in a comdat COFF section, this will switch
     139             :   /// to a new .debug$S section in that comdat. This method ensures that the
     140             :   /// section starts with the magic version number on first use. If GVSym is
     141             :   /// null, uses the main .debug$S section.
     142             :   void switchToDebugSectionForSymbol(const MCSymbol *GVSym);
     143             : 
     144             :   /// The next available function index for use with our .cv_* directives. Not
     145             :   /// to be confused with type indices for LF_FUNC_ID records.
     146             :   unsigned NextFuncId = 0;
     147             : 
     148             :   InlineSite &getInlineSite(const DILocation *InlinedAt,
     149             :                             const DISubprogram *Inlinee);
     150             : 
     151             :   codeview::TypeIndex getFuncIdForSubprogram(const DISubprogram *SP);
     152             : 
     153             :   void calculateRanges(LocalVariable &Var,
     154             :                        const DbgValueHistoryMap::InstrRanges &Ranges);
     155             : 
     156             :   static void collectInlineSiteChildren(SmallVectorImpl<unsigned> &Children,
     157             :                                         const FunctionInfo &FI,
     158             :                                         const InlineSite &Site);
     159             : 
     160             :   /// Remember some debug info about each function. Keep it in a stable order to
     161             :   /// emit at the end of the TU.
     162             :   MapVector<const Function *, FunctionInfo> FnDebugInfo;
     163             : 
     164             :   /// Map from DIFile to .cv_file id.
     165             :   DenseMap<const DIFile *, unsigned> FileIdMap;
     166             : 
     167             :   /// All inlined subprograms in the order they should be emitted.
     168             :   SmallSetVector<const DISubprogram *, 4> InlinedSubprograms;
     169             : 
     170             :   /// Map from a pair of DI metadata nodes and its DI type (or scope) that can
     171             :   /// be nullptr, to CodeView type indices. Primarily indexed by
     172             :   /// {DIType*, DIType*} and {DISubprogram*, DIType*}.
     173             :   ///
     174             :   /// The second entry in the key is needed for methods as DISubroutineType
     175             :   /// representing static method type are shared with non-method function type.
     176             :   DenseMap<std::pair<const DINode *, const DIType *>, codeview::TypeIndex>
     177             :       TypeIndices;
     178             : 
     179             :   /// Map from DICompositeType* to complete type index. Non-record types are
     180             :   /// always looked up in the normal TypeIndices map.
     181             :   DenseMap<const DICompositeType *, codeview::TypeIndex> CompleteTypeIndices;
     182             : 
     183             :   /// Complete record types to emit after all active type lowerings are
     184             :   /// finished.
     185             :   SmallVector<const DICompositeType *, 4> DeferredCompleteTypes;
     186             : 
     187             :   /// Number of type lowering frames active on the stack.
     188             :   unsigned TypeEmissionLevel = 0;
     189             : 
     190             :   codeview::TypeIndex VBPType;
     191             : 
     192             :   const DISubprogram *CurrentSubprogram = nullptr;
     193             : 
     194             :   // The UDTs we have seen while processing types; each entry is a pair of type
     195             :   // index and type name.
     196             :   std::vector<std::pair<std::string, const DIType *>> LocalUDTs;
     197             :   std::vector<std::pair<std::string, const DIType *>> GlobalUDTs;
     198             : 
     199             :   using FileToFilepathMapTy = std::map<const DIFile *, std::string>;
     200             :   FileToFilepathMapTy FileToFilepathMap;
     201             : 
     202             :   StringRef getFullFilepath(const DIFile *S);
     203             : 
     204             :   unsigned maybeRecordFile(const DIFile *F);
     205             : 
     206             :   void maybeRecordLocation(const DebugLoc &DL, const MachineFunction *MF);
     207             : 
     208             :   void clear();
     209             : 
     210             :   void setCurrentSubprogram(const DISubprogram *SP) {
     211         222 :     CurrentSubprogram = SP;
     212         222 :     LocalUDTs.clear();
     213             :   }
     214             : 
     215             :   /// Emit the magic version number at the start of a CodeView type or symbol
     216             :   /// section. Appears at the front of every .debug$S or .debug$T section.
     217             :   void emitCodeViewMagicVersion();
     218             : 
     219             :   void emitTypeInformation();
     220             : 
     221             :   void emitCompilerInformation();
     222             : 
     223             :   void emitInlineeLinesSubsection();
     224             : 
     225             :   void emitDebugInfoForFunction(const Function *GV, FunctionInfo &FI);
     226             : 
     227             :   void emitDebugInfoForGlobals();
     228             : 
     229             :   void emitDebugInfoForRetainedTypes();
     230             : 
     231             :   void
     232             :   emitDebugInfoForUDTs(ArrayRef<std::pair<std::string, const DIType *>> UDTs);
     233             : 
     234             :   void emitDebugInfoForGlobal(const DIGlobalVariable *DIGV,
     235             :                               const GlobalVariable *GV, MCSymbol *GVSym);
     236             : 
     237             :   /// Opens a subsection of the given kind in a .debug$S codeview section.
     238             :   /// Returns an end label for use with endCVSubsection when the subsection is
     239             :   /// finished.
     240             :   MCSymbol *beginCVSubsection(codeview::DebugSubsectionKind Kind);
     241             : 
     242             :   void endCVSubsection(MCSymbol *EndLabel);
     243             : 
     244             :   void emitInlinedCallSite(const FunctionInfo &FI, const DILocation *InlinedAt,
     245             :                            const InlineSite &Site);
     246             : 
     247             :   using InlinedVariable = DbgValueHistoryMap::InlinedVariable;
     248             : 
     249             :   void collectVariableInfo(const DISubprogram *SP);
     250             : 
     251             :   void collectVariableInfoFromMFTable(DenseSet<InlinedVariable> &Processed);
     252             : 
     253             :   /// Records information about a local variable in the appropriate scope. In
     254             :   /// particular, locals from inlined code live inside the inlining site.
     255             :   void recordLocalVariable(LocalVariable &&Var, const DILocation *Loc);
     256             : 
     257             :   /// Emits local variables in the appropriate order.
     258             :   void emitLocalVariableList(ArrayRef<LocalVariable> Locals);
     259             : 
     260             :   /// Emits an S_LOCAL record and its associated defined ranges.
     261             :   void emitLocalVariable(const LocalVariable &Var);
     262             : 
     263             :   /// Translates the DIType to codeview if necessary and returns a type index
     264             :   /// for it.
     265             :   codeview::TypeIndex getTypeIndex(DITypeRef TypeRef,
     266             :                                    DITypeRef ClassTyRef = DITypeRef());
     267             : 
     268             :   codeview::TypeIndex getTypeIndexForReferenceTo(DITypeRef TypeRef);
     269             : 
     270             :   codeview::TypeIndex getMemberFunctionType(const DISubprogram *SP,
     271             :                                             const DICompositeType *Class);
     272             : 
     273             :   codeview::TypeIndex getScopeIndex(const DIScope *Scope);
     274             : 
     275             :   codeview::TypeIndex getVBPTypeIndex();
     276             : 
     277             :   void addToUDTs(const DIType *Ty);
     278             : 
     279             :   codeview::TypeIndex lowerType(const DIType *Ty, const DIType *ClassTy);
     280             :   codeview::TypeIndex lowerTypeAlias(const DIDerivedType *Ty);
     281             :   codeview::TypeIndex lowerTypeArray(const DICompositeType *Ty);
     282             :   codeview::TypeIndex lowerTypeBasic(const DIBasicType *Ty);
     283             :   codeview::TypeIndex lowerTypePointer(const DIDerivedType *Ty);
     284             :   codeview::TypeIndex lowerTypeMemberPointer(const DIDerivedType *Ty);
     285             :   codeview::TypeIndex lowerTypeModifier(const DIDerivedType *Ty);
     286             :   codeview::TypeIndex lowerTypeFunction(const DISubroutineType *Ty);
     287             :   codeview::TypeIndex lowerTypeVFTableShape(const DIDerivedType *Ty);
     288             :   codeview::TypeIndex lowerTypeMemberFunction(const DISubroutineType *Ty,
     289             :                                               const DIType *ClassTy,
     290             :                                               int ThisAdjustment);
     291             :   codeview::TypeIndex lowerTypeEnum(const DICompositeType *Ty);
     292             :   codeview::TypeIndex lowerTypeClass(const DICompositeType *Ty);
     293             :   codeview::TypeIndex lowerTypeUnion(const DICompositeType *Ty);
     294             : 
     295             :   /// Symbol records should point to complete types, but type records should
     296             :   /// always point to incomplete types to avoid cycles in the type graph. Only
     297             :   /// use this entry point when generating symbol records. The complete and
     298             :   /// incomplete type indices only differ for record types. All other types use
     299             :   /// the same index.
     300             :   codeview::TypeIndex getCompleteTypeIndex(DITypeRef TypeRef);
     301             : 
     302             :   codeview::TypeIndex lowerCompleteTypeClass(const DICompositeType *Ty);
     303             :   codeview::TypeIndex lowerCompleteTypeUnion(const DICompositeType *Ty);
     304             : 
     305             :   struct TypeLoweringScope;
     306             : 
     307             :   void emitDeferredCompleteTypes();
     308             : 
     309             :   void collectMemberInfo(ClassInfo &Info, const DIDerivedType *DDTy);
     310             :   ClassInfo collectClassInfo(const DICompositeType *Ty);
     311             : 
     312             :   /// Common record member lowering functionality for record types, which are
     313             :   /// structs, classes, and unions. Returns the field list index and the member
     314             :   /// count.
     315             :   std::tuple<codeview::TypeIndex, codeview::TypeIndex, unsigned, bool>
     316             :   lowerRecordFieldList(const DICompositeType *Ty);
     317             : 
     318             :   /// Inserts {{Node, ClassTy}, TI} into TypeIndices and checks for duplicates.
     319             :   codeview::TypeIndex recordTypeIndexForDINode(const DINode *Node,
     320             :                                                codeview::TypeIndex TI,
     321             :                                                const DIType *ClassTy = nullptr);
     322             : 
     323             :   unsigned getPointerSizeInBytes();
     324             : 
     325             : protected:
     326             :   /// \brief Gather pre-function debug information.
     327             :   void beginFunctionImpl(const MachineFunction *MF) override;
     328             : 
     329             :   /// \brief Gather post-function debug information.
     330             :   void endFunctionImpl(const MachineFunction *) override;
     331             : 
     332             : public:
     333             :   CodeViewDebug(AsmPrinter *Asm);
     334             : 
     335         115 :   void setSymbolSize(const MCSymbol *, uint64_t) override {}
     336             : 
     337             :   /// \brief Emit the COFF section that holds the line table information.
     338             :   void endModule() override;
     339             : 
     340             :   /// \brief Process beginning of an instruction.
     341             :   void beginInstruction(const MachineInstr *MI) override;
     342             : };
     343             : 
     344             : } // end namespace llvm
     345             : 
     346             : #endif // LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H

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