lib/Bitcode/Reader/MetadataLoader.h

   1 //===-- Bitcode/Reader/MetadataLoader.h - Load Metadatas -------*- 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 class handles loading Metadatas.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_BITCODE_READER_METADATALOADER_H
  15 #define LLVM_LIB_BITCODE_READER_METADATALOADER_H
  16
  17 #include "llvm/ADT/SmallVector.h"
  18 #include "llvm/Support/Error.h"
  19
  20 #include <functional>
  21 #include <memory>
  22
  23 namespace llvm {
  24 class BitcodeReaderValueList;
  25 class BitstreamCursor;
  26 class DISubprogram;
  27 class Error;
  28 class Function;
  29 class Instruction;
  30 class Metadata;
  31 class MDNode;
  32 class Module;
  33 class Type;
  34
  35 /// Helper class that handles loading Metadatas and keeping them available.
  36 class MetadataLoader {
  37   class MetadataLoaderImpl;
  38   std::unique_ptr<MetadataLoaderImpl> Pimpl;
  39   Error parseMetadata(bool ModuleLevel);
  40
  41 public:
  42   ~MetadataLoader();
  43   MetadataLoader(BitstreamCursor &Stream, Module &TheModule,
  44                  BitcodeReaderValueList &ValueList, bool IsImporting,
  45                  std::function<Type *(unsigned)> getTypeByID);
  46   MetadataLoader &operator=(MetadataLoader &&);
  47   MetadataLoader(MetadataLoader &&);
  48
  49   // Parse a module metadata block
  50   Error parseModuleMetadata() { return parseMetadata(true); }
  51
  52   // Parse a function metadata block
  53   Error parseFunctionMetadata() { return parseMetadata(false); }
  54
  55   /// Set the mode to strip TBAA metadata on load.
  56   void setStripTBAA(bool StripTBAA = true);
  57
  58   /// Return true if the Loader is stripping TBAA metadata.
  59   bool isStrippingTBAA();
  60
  61   // Return true there are remaining unresolved forward references.
  62   bool hasFwdRefs() const;
  63
  64   /// Return the given metadata, creating a replaceable forward reference if
  65   /// necessary.
  66   Metadata *getMetadataFwdRefOrLoad(unsigned Idx);
  67
  68   MDNode *getMDNodeFwdRefOrNull(unsigned Idx);
  69
  70   /// Return the DISubprogram metadata for a Function if any, null otherwise.
  71   DISubprogram *lookupSubprogramForFunction(Function *F);
  72
  73   /// Parse a `METADATA_ATTACHMENT` block for a function.
  74   Error parseMetadataAttachment(
  75       Function &F, const SmallVectorImpl<Instruction *> &InstructionList);
  76
  77   /// Parse a `METADATA_KIND` block for the current module.
  78   Error parseMetadataKinds();
  79
  80   unsigned size() const;
  81   void shrinkTo(unsigned N);
  82
  83   /// Perform bitcode upgrades on llvm.dbg.* calls.
  84   void upgradeDebugIntrinsics(Function &F);
  85 };
  86 }
  87
  88 #endif // LLVM_LIB_BITCODE_READER_METADATALOADER_H