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308 lines
12 KiB
308 lines
12 KiB
//===-- llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h ----*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains support for writing Microsoft CodeView debug info.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
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#define LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
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#include "DebugHandlerBase.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/DebugInfo/CodeView/MemoryTypeTableBuilder.h"
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#include "llvm/DebugInfo/CodeView/TypeIndex.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/DebugLoc.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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namespace llvm {
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class StringRef;
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class LexicalScope;
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struct ClassInfo;
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/// \brief Collects and handles line tables information in a CodeView format.
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class LLVM_LIBRARY_VISIBILITY CodeViewDebug : public DebugHandlerBase {
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MCStreamer &OS;
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codeview::MemoryTypeTableBuilder TypeTable;
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/// Represents the most general definition range.
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struct LocalVarDefRange {
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/// Indicates that variable data is stored in memory relative to the
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/// specified register.
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int InMemory : 1;
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/// Offset of variable data in memory.
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int DataOffset : 31;
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/// Offset of the data into the user level struct. If zero, no splitting
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/// occurred.
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uint16_t StructOffset;
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/// Register containing the data or the register base of the memory
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/// location containing the data.
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uint16_t CVRegister;
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/// Compares all location fields. This includes all fields except the label
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/// ranges.
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bool isDifferentLocation(LocalVarDefRange &O) {
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return InMemory != O.InMemory || DataOffset != O.DataOffset ||
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StructOffset != O.StructOffset || CVRegister != O.CVRegister;
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}
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SmallVector<std::pair<const MCSymbol *, const MCSymbol *>, 1> Ranges;
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};
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static LocalVarDefRange createDefRangeMem(uint16_t CVRegister, int Offset);
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static LocalVarDefRange createDefRangeReg(uint16_t CVRegister);
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/// Similar to DbgVariable in DwarfDebug, but not dwarf-specific.
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struct LocalVariable {
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const DILocalVariable *DIVar = nullptr;
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SmallVector<LocalVarDefRange, 1> DefRanges;
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};
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struct InlineSite {
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SmallVector<LocalVariable, 1> InlinedLocals;
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SmallVector<const DILocation *, 1> ChildSites;
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const DISubprogram *Inlinee = nullptr;
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unsigned SiteFuncId = 0;
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};
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// For each function, store a vector of labels to its instructions, as well as
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// to the end of the function.
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struct FunctionInfo {
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/// Map from inlined call site to inlined instructions and child inlined
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/// call sites. Listed in program order.
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std::unordered_map<const DILocation *, InlineSite> InlineSites;
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/// Ordered list of top-level inlined call sites.
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SmallVector<const DILocation *, 1> ChildSites;
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SmallVector<LocalVariable, 1> Locals;
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DebugLoc LastLoc;
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const MCSymbol *Begin = nullptr;
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const MCSymbol *End = nullptr;
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unsigned FuncId = 0;
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unsigned LastFileId = 0;
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bool HaveLineInfo = false;
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};
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FunctionInfo *CurFn;
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/// The set of comdat .debug$S sections that we've seen so far. Each section
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/// must start with a magic version number that must only be emitted once.
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/// This set tracks which sections we've already opened.
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DenseSet<MCSectionCOFF *> ComdatDebugSections;
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/// Switch to the appropriate .debug$S section for GVSym. If GVSym, the symbol
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/// of an emitted global value, is in a comdat COFF section, this will switch
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/// to a new .debug$S section in that comdat. This method ensures that the
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/// section starts with the magic version number on first use. If GVSym is
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/// null, uses the main .debug$S section.
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void switchToDebugSectionForSymbol(const MCSymbol *GVSym);
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/// The next available function index for use with our .cv_* directives. Not
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/// to be confused with type indices for LF_FUNC_ID records.
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unsigned NextFuncId = 0;
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InlineSite &getInlineSite(const DILocation *InlinedAt,
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const DISubprogram *Inlinee);
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codeview::TypeIndex getFuncIdForSubprogram(const DISubprogram *SP);
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static void collectInlineSiteChildren(SmallVectorImpl<unsigned> &Children,
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const FunctionInfo &FI,
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const InlineSite &Site);
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/// Remember some debug info about each function. Keep it in a stable order to
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/// emit at the end of the TU.
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MapVector<const Function *, FunctionInfo> FnDebugInfo;
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/// Map from DIFile to .cv_file id.
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DenseMap<const DIFile *, unsigned> FileIdMap;
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/// All inlined subprograms in the order they should be emitted.
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SmallSetVector<const DISubprogram *, 4> InlinedSubprograms;
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/// Map from a pair of DI metadata nodes and its DI type (or scope) that can
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/// be nullptr, to CodeView type indices. Primarily indexed by
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/// {DIType*, DIType*} and {DISubprogram*, DIType*}.
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///
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/// The second entry in the key is needed for methods as DISubroutineType
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/// representing static method type are shared with non-method function type.
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DenseMap<std::pair<const DINode *, const DIType *>, codeview::TypeIndex>
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TypeIndices;
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/// Map from DICompositeType* to complete type index. Non-record types are
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/// always looked up in the normal TypeIndices map.
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DenseMap<const DICompositeType *, codeview::TypeIndex> CompleteTypeIndices;
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/// Complete record types to emit after all active type lowerings are
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/// finished.
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SmallVector<const DICompositeType *, 4> DeferredCompleteTypes;
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/// Number of type lowering frames active on the stack.
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unsigned TypeEmissionLevel = 0;
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codeview::TypeIndex VBPType;
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const DISubprogram *CurrentSubprogram = nullptr;
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// The UDTs we have seen while processing types; each entry is a pair of type
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// index and type name.
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std::vector<std::pair<std::string, codeview::TypeIndex>> LocalUDTs,
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GlobalUDTs;
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typedef std::map<const DIFile *, std::string> FileToFilepathMapTy;
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FileToFilepathMapTy FileToFilepathMap;
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StringRef getFullFilepath(const DIFile *S);
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unsigned maybeRecordFile(const DIFile *F);
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void maybeRecordLocation(const DebugLoc &DL, const MachineFunction *MF);
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void clear();
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void setCurrentSubprogram(const DISubprogram *SP) {
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CurrentSubprogram = SP;
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LocalUDTs.clear();
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}
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/// Emit the magic version number at the start of a CodeView type or symbol
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/// section. Appears at the front of every .debug$S or .debug$T section.
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void emitCodeViewMagicVersion();
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void emitTypeInformation();
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void emitInlineeLinesSubsection();
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void emitDebugInfoForFunction(const Function *GV, FunctionInfo &FI);
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void emitDebugInfoForGlobals();
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void emitDebugInfoForRetainedTypes();
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void emitDebugInfoForUDTs(
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ArrayRef<std::pair<std::string, codeview::TypeIndex>> UDTs);
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void emitDebugInfoForGlobal(const DIGlobalVariable *DIGV, MCSymbol *GVSym);
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/// Opens a subsection of the given kind in a .debug$S codeview section.
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/// Returns an end label for use with endCVSubsection when the subsection is
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/// finished.
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MCSymbol *beginCVSubsection(codeview::ModuleSubstreamKind Kind);
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void endCVSubsection(MCSymbol *EndLabel);
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void emitInlinedCallSite(const FunctionInfo &FI, const DILocation *InlinedAt,
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const InlineSite &Site);
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typedef DbgValueHistoryMap::InlinedVariable InlinedVariable;
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void collectVariableInfo(const DISubprogram *SP);
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void collectVariableInfoFromMMITable(DenseSet<InlinedVariable> &Processed);
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/// Records information about a local variable in the appropriate scope. In
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/// particular, locals from inlined code live inside the inlining site.
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void recordLocalVariable(LocalVariable &&Var, const DILocation *Loc);
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/// Emits local variables in the appropriate order.
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void emitLocalVariableList(ArrayRef<LocalVariable> Locals);
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/// Emits an S_LOCAL record and its associated defined ranges.
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void emitLocalVariable(const LocalVariable &Var);
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/// Translates the DIType to codeview if necessary and returns a type index
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/// for it.
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codeview::TypeIndex getTypeIndex(DITypeRef TypeRef,
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DITypeRef ClassTyRef = DITypeRef());
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codeview::TypeIndex getMemberFunctionType(const DISubprogram *SP,
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const DICompositeType *Class);
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codeview::TypeIndex getScopeIndex(const DIScope *Scope);
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codeview::TypeIndex getVBPTypeIndex();
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void addToUDTs(const DIType *Ty, codeview::TypeIndex TI);
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codeview::TypeIndex lowerType(const DIType *Ty, const DIType *ClassTy);
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codeview::TypeIndex lowerTypeAlias(const DIDerivedType *Ty);
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codeview::TypeIndex lowerTypeArray(const DICompositeType *Ty);
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codeview::TypeIndex lowerTypeBasic(const DIBasicType *Ty);
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codeview::TypeIndex lowerTypePointer(const DIDerivedType *Ty);
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codeview::TypeIndex lowerTypeMemberPointer(const DIDerivedType *Ty);
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codeview::TypeIndex lowerTypeModifier(const DIDerivedType *Ty);
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codeview::TypeIndex lowerTypeFunction(const DISubroutineType *Ty);
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codeview::TypeIndex lowerTypeMemberFunction(const DISubroutineType *Ty,
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const DIType *ClassTy,
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int ThisAdjustment);
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codeview::TypeIndex lowerTypeEnum(const DICompositeType *Ty);
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codeview::TypeIndex lowerTypeClass(const DICompositeType *Ty);
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codeview::TypeIndex lowerTypeUnion(const DICompositeType *Ty);
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/// Symbol records should point to complete types, but type records should
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/// always point to incomplete types to avoid cycles in the type graph. Only
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/// use this entry point when generating symbol records. The complete and
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/// incomplete type indices only differ for record types. All other types use
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/// the same index.
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codeview::TypeIndex getCompleteTypeIndex(DITypeRef TypeRef);
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codeview::TypeIndex lowerCompleteTypeClass(const DICompositeType *Ty);
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codeview::TypeIndex lowerCompleteTypeUnion(const DICompositeType *Ty);
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struct TypeLoweringScope;
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void emitDeferredCompleteTypes();
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void collectMemberInfo(ClassInfo &Info, const DIDerivedType *DDTy);
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ClassInfo collectClassInfo(const DICompositeType *Ty);
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/// Common record member lowering functionality for record types, which are
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/// structs, classes, and unions. Returns the field list index and the member
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/// count.
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std::tuple<codeview::TypeIndex, codeview::TypeIndex, unsigned, bool>
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lowerRecordFieldList(const DICompositeType *Ty);
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/// Inserts {{Node, ClassTy}, TI} into TypeIndices and checks for duplicates.
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codeview::TypeIndex recordTypeIndexForDINode(const DINode *Node,
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codeview::TypeIndex TI,
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const DIType *ClassTy = nullptr);
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unsigned getPointerSizeInBytes();
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public:
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CodeViewDebug(AsmPrinter *Asm);
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void setSymbolSize(const llvm::MCSymbol *, uint64_t) override {}
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/// \brief Emit the COFF section that holds the line table information.
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void endModule() override;
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/// \brief Gather pre-function debug information.
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void beginFunction(const MachineFunction *MF) override;
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/// \brief Gather post-function debug information.
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void endFunction(const MachineFunction *) override;
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/// \brief Process beginning of an instruction.
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void beginInstruction(const MachineInstr *MI) override;
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};
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} // End of namespace llvm
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#endif
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