tools/lto/LTOModule.h

   1 //===-LTOModule.h - LLVM Link Time Optimizer ------------------------------===//
   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 declares the LTOModule class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LTO_MODULE_H
  15 #define LTO_MODULE_H
  16
  17 #include "llvm/Module.h"
  18 #include "llvm/ADT/OwningPtr.h"
  19 #include "llvm/Target/TargetMachine.h"
  20 #include "llvm/ADT/StringMap.h"
  21
  22 #include "llvm-c/lto.h"
  23
  24 #include <vector>
  25 #include <string>
  26
  27
  28 // forward references to llvm classes
  29 namespace llvm {
  30     class Mangler;
  31     class MemoryBuffer;
  32     class GlobalValue;
  33     class Value;
  34     class Function;
  35 }
  36
  37
  38 //
  39 // C++ class which implements the opaque lto_module_t
  40 //
  41 class LTOModule {
  42 public:
  43
  44     static bool              isBitcodeFile(const void* mem, size_t length);
  45     static bool              isBitcodeFile(const char* path);
  46
  47     static bool              isBitcodeFileForTarget(const void* mem,
  48                                     size_t length, const char* triplePrefix);
  49
  50     static bool              isBitcodeFileForTarget(const char* path,
  51                                                     const char* triplePrefix);
  52
  53     static LTOModule*        makeLTOModule(const char* path,
  54                                           std::string& errMsg);
  55     static LTOModule*        makeLTOModule(const void* mem, size_t length,
  56                                            std::string& errMsg);
  57
  58     const char*              getTargetTriple();
  59     uint32_t                 getSymbolCount();
  60     lto_symbol_attributes    getSymbolAttributes(uint32_t index);
  61     const char*              getSymbolName(uint32_t index);
  62
  63     llvm::Module *           getLLVVMModule() { return _module.get(); }
  64
  65 private:
  66                             LTOModule(llvm::Module* m, llvm::TargetMachine* t);
  67
  68     void                    lazyParseSymbols();
  69     void                    addDefinedSymbol(llvm::GlobalValue* def,
  70                                                     llvm::Mangler& mangler,
  71                                                     bool isFunction);
  72     void                    addPotentialUndefinedSymbol(llvm::GlobalValue* decl,
  73                                                         llvm::Mangler &mangler);
  74     void                    findExternalRefs(llvm::Value* value,
  75                                                 llvm::Mangler& mangler);
  76     void                    addDefinedFunctionSymbol(llvm::Function* f,
  77                                                         llvm::Mangler &mangler);
  78     void                    addDefinedDataSymbol(llvm::GlobalValue* v,
  79                                                         llvm::Mangler &mangler);
  80     void                    addAsmGlobalSymbol(const char *);
  81     void                    addObjCClass(llvm::GlobalVariable* clgv);
  82     void                    addObjCCategory(llvm::GlobalVariable* clgv);
  83     void                    addObjCClassRef(llvm::GlobalVariable* clgv);
  84     bool                    objcClassNameFromExpression(llvm::Constant* c,
  85                                                     std::string& name);
  86
  87     static bool             isTargetMatch(llvm::MemoryBuffer* memBuffer,
  88                                                     const char* triplePrefix);
  89
  90     static LTOModule*       makeLTOModule(llvm::MemoryBuffer* buffer,
  91                                                         std::string& errMsg);
  92     static llvm::MemoryBuffer* makeBuffer(const void* mem, size_t length);
  93
  94     typedef llvm::StringMap<uint8_t> StringSet;
  95
  96     struct NameAndAttributes {
  97         const char*            name;
  98         lto_symbol_attributes  attributes;
  99     };
 100
 101     llvm::OwningPtr<llvm::Module>           _module;
 102     llvm::OwningPtr<llvm::TargetMachine>    _target;
 103     bool                                    _symbolsParsed;
 104     std::vector<NameAndAttributes>          _symbols;
 105     // _defines and _undefines only needed to disambiguate tentative definitions
 106     StringSet                               _defines;
 107     llvm::StringMap<NameAndAttributes>      _undefines;
 108 };
 109
 110 extern std::string getFeatureString(const char *TargetTriple);
 111
 112 #endif // LTO_MODULE_H
 113