lld/COFF/Driver.h

   1 //===- Driver.h -------------------------------------------------*- C++ -*-===//
   2 //
   3 //                             The LLVM Linker
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef LLD_COFF_DRIVER_H
  11 #define LLD_COFF_DRIVER_H
  12
  13 #include "Config.h"
  14 #include "SymbolTable.h"
  15 #include "lld/Core/LLVM.h"
  16 #include "lld/Core/Reproduce.h"
  17 #include "llvm/ADT/Optional.h"
  18 #include "llvm/ADT/StringRef.h"
  19 #include "llvm/Object/Archive.h"
  20 #include "llvm/Object/COFF.h"
  21 #include "llvm/Option/Arg.h"
  22 #include "llvm/Option/ArgList.h"
  23 #include "llvm/Support/TarWriter.h"
  24 #include <memory>
  25 #include <set>
  26 #include <vector>
  27
  28 namespace lld {
  29 namespace coff {
  30
  31 class LinkerDriver;
  32 extern LinkerDriver *Driver;
  33
  34 using llvm::COFF::MachineTypes;
  35 using llvm::COFF::WindowsSubsystem;
  36 using llvm::Optional;
  37
  38 // Implemented in MarkLive.cpp.
  39 void markLive(const std::vector<Chunk *> &Chunks);
  40
  41 // Implemented in ICF.cpp.
  42 void doICF(const std::vector<Chunk *> &Chunks);
  43
  44 class ArgParser {
  45 public:
  46   // Parses command line options.
  47   llvm::opt::InputArgList parse(llvm::ArrayRef<const char *> Args);
  48
  49   // Concatenate LINK environment varirable and given arguments and parse them.
  50   llvm::opt::InputArgList parseLINK(std::vector<const char *> Args);
  51
  52   // Tokenizes a given string and then parses as command line options.
  53   llvm::opt::InputArgList parse(StringRef S) { return parse(tokenize(S)); }
  54
  55 private:
  56   std::vector<const char *> tokenize(StringRef S);
  57
  58   std::vector<const char *> replaceResponseFiles(std::vector<const char *>);
  59 };
  60
  61 class LinkerDriver {
  62 public:
  63   LinkerDriver() { coff::Symtab = &Symtab; }
  64   void link(llvm::ArrayRef<const char *> Args);
  65
  66   // Used by the resolver to parse .drectve section contents.
  67   void parseDirectives(StringRef S);
  68
  69   // Used by ArchiveFile to enqueue members.
  70   void enqueueArchiveMember(const Archive::Child &C, StringRef SymName,
  71                             StringRef ParentName);
  72
  73 private:
  74   ArgParser Parser;
  75   SymbolTable Symtab;
  76
  77   std::unique_ptr<llvm::TarWriter> Tar; // for /linkrepro
  78
  79   // Opens a file. Path has to be resolved already.
  80   MemoryBufferRef openFile(StringRef Path);
  81
  82   // Searches a file from search paths.
  83   Optional<StringRef> findFile(StringRef Filename);
  84   Optional<StringRef> findLib(StringRef Filename);
  85   StringRef doFindFile(StringRef Filename);
  86   StringRef doFindLib(StringRef Filename);
  87
  88   // Parses LIB environment which contains a list of search paths.
  89   void addLibSearchPaths();
  90
  91   // Library search path. The first element is always "" (current directory).
  92   std::vector<StringRef> SearchPaths;
  93   std::set<std::string> VisitedFiles;
  94   std::set<std::string> VisitedLibs;
  95
  96   SymbolBody *addUndefined(StringRef Sym);
  97   StringRef mangle(StringRef Sym);
  98
  99   // Windows specific -- "main" is not the only main function in Windows.
 100   // You can choose one from these four -- {w,}{WinMain,main}.
 101   // There are four different entry point functions for them,
 102   // {w,}{WinMain,main}CRTStartup, respectively. The linker needs to
 103   // choose the right one depending on which "main" function is defined.
 104   // This function looks up the symbol table and resolve corresponding
 105   // entry point name.
 106   StringRef findDefaultEntry();
 107   WindowsSubsystem inferSubsystem();
 108
 109   void invokeMSVC(llvm::opt::InputArgList &Args);
 110
 111   MemoryBufferRef takeBuffer(std::unique_ptr<MemoryBuffer> MB);
 112   void addBuffer(std::unique_ptr<MemoryBuffer> MB);
 113   void addArchiveBuffer(MemoryBufferRef MBRef, StringRef SymName,
 114                         StringRef ParentName);
 115
 116   void enqueuePath(StringRef Path);
 117
 118   void enqueueTask(std::function<void()> Task);
 119   bool run();
 120
 121   std::list<std::function<void()>> TaskQueue;
 122   std::vector<StringRef> FilePaths;
 123   std::vector<MemoryBufferRef> Resources;
 124 };
 125
 126 // Functions below this line are defined in DriverUtils.cpp.
 127
 128 void printHelp(const char *Argv0);
 129
 130 // For /machine option.
 131 MachineTypes getMachineType(StringRef Arg);
 132 StringRef machineToStr(MachineTypes MT);
 133
 134 // Parses a string in the form of "<integer>[,<integer>]".
 135 void parseNumbers(StringRef Arg, uint64_t *Addr, uint64_t *Size = nullptr);
 136
 137 // Parses a string in the form of "<integer>[.<integer>]".
 138 // Minor's default value is 0.
 139 void parseVersion(StringRef Arg, uint32_t *Major, uint32_t *Minor);
 140
 141 // Parses a string in the form of "<subsystem>[,<integer>[.<integer>]]".
 142 void parseSubsystem(StringRef Arg, WindowsSubsystem *Sys, uint32_t *Major,
 143                     uint32_t *Minor);
 144
 145 void parseAlternateName(StringRef);
 146 void parseMerge(StringRef);
 147 void parseSection(StringRef);
 148
 149 // Parses a string in the form of "EMBED[,=<integer>]|NO".
 150 void parseManifest(StringRef Arg);
 151
 152 // Parses a string in the form of "level=<string>|uiAccess=<string>"
 153 void parseManifestUAC(StringRef Arg);
 154
 155 // Create a resource file containing a manifest XML.
 156 std::unique_ptr<MemoryBuffer> createManifestRes();
 157 void createSideBySideManifest();
 158
 159 // Used for dllexported symbols.
 160 Export parseExport(StringRef Arg);
 161 void fixupExports();
 162 void assignExportOrdinals();
 163
 164 // Parses a string in the form of "key=value" and check
 165 // if value matches previous values for the key.
 166 // This feature used in the directive section to reject
 167 // incompatible objects.
 168 void checkFailIfMismatch(StringRef Arg);
 169
 170 // Convert Windows resource files (.res files) to a .obj file
 171 // using cvtres.exe.
 172 std::unique_ptr<MemoryBuffer>
 173 convertResToCOFF(const std::vector<MemoryBufferRef> &MBs);
 174
 175 void runMSVCLinker(std::string Rsp, ArrayRef<StringRef> Objects);
 176
 177 // Create enum with OPT_xxx values for each option in Options.td
 178 enum {
 179   OPT_INVALID = 0,
 180 #define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11, _12) OPT_##ID,
 181 #include "Options.inc"
 182 #undef OPTION
 183 };
 184
 185 } // namespace coff
 186 } // namespace lld
 187
 188 #endif