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      1 //===--- Tool.h - Compilation Tools -----------------------------*- 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 #ifndef LLVM_CLANG_DRIVER_TOOL_H
     11 #define LLVM_CLANG_DRIVER_TOOL_H
     12 
     13 #include "clang/Basic/LLVM.h"
     14 #include "llvm/Support/Program.h"
     15 
     16 namespace llvm {
     17 namespace opt {
     18   class ArgList;
     19 }
     20 }
     21 
     22 namespace clang {
     23 namespace driver {
     24 
     25   class Compilation;
     26   class InputInfo;
     27   class Job;
     28   class JobAction;
     29   class ToolChain;
     30 
     31   typedef SmallVector<InputInfo, 4> InputInfoList;
     32 
     33 /// Tool - Information on a specific compilation tool.
     34 class Tool {
     35 public:
     36   // Documents the level of support for response files in this tool.
     37   // Response files are necessary if the command line gets too large,
     38   // requiring the arguments to be transfered to a file.
     39   enum ResponseFileSupport {
     40     // Provides full support for response files, which means we can transfer
     41     // all tool input arguments to a file. E.g.: clang, gcc, binutils and MSVC
     42     // tools.
     43     RF_Full,
     44     // Input file names can live in a file, but flags can't. E.g.: ld64 (Mac
     45     // OS X linker).
     46     RF_FileList,
     47     // Does not support response files: all arguments must be passed via
     48     // command line.
     49     RF_None
     50   };
     51 
     52 private:
     53   /// The tool name (for debugging).
     54   const char *Name;
     55 
     56   /// The human readable name for the tool, for use in diagnostics.
     57   const char *ShortName;
     58 
     59   /// The tool chain this tool is a part of.
     60   const ToolChain &TheToolChain;
     61 
     62   /// The level of support for response files seen in this tool
     63   const ResponseFileSupport ResponseSupport;
     64 
     65   /// The encoding to use when writing response files for this tool on Windows
     66   const llvm::sys::WindowsEncodingMethod ResponseEncoding;
     67 
     68   /// The flag used to pass a response file via command line to this tool
     69   const char *const ResponseFlag;
     70 
     71 public:
     72   Tool(const char *Name, const char *ShortName, const ToolChain &TC,
     73        ResponseFileSupport ResponseSupport = RF_None,
     74        llvm::sys::WindowsEncodingMethod ResponseEncoding = llvm::sys::WEM_UTF8,
     75        const char *ResponseFlag = "@");
     76 
     77 public:
     78   virtual ~Tool();
     79 
     80   const char *getName() const { return Name; }
     81 
     82   const char *getShortName() const { return ShortName; }
     83 
     84   const ToolChain &getToolChain() const { return TheToolChain; }
     85 
     86   virtual bool hasIntegratedAssembler() const { return false; }
     87   virtual bool canEmitIR() const { return false; }
     88   virtual bool hasIntegratedCPP() const = 0;
     89   virtual bool isLinkJob() const { return false; }
     90   virtual bool isDsymutilJob() const { return false; }
     91   /// \brief Returns the level of support for response files of this tool,
     92   /// whether it accepts arguments to be passed via a file on disk.
     93   ResponseFileSupport getResponseFilesSupport() const {
     94     return ResponseSupport;
     95   }
     96   /// \brief Returns which encoding the response file should use. This is only
     97   /// relevant on Windows platforms where there are different encodings being
     98   /// accepted for different tools. On UNIX, UTF8 is universal.
     99   ///
    100   /// Windows use cases: - GCC and Binutils on mingw only accept ANSI response
    101   /// files encoded with the system current code page.
    102   /// - MSVC's CL.exe and LINK.exe accept UTF16 on Windows.
    103   /// - Clang accepts both UTF8 and UTF16.
    104   ///
    105   /// FIXME: When GNU tools learn how to parse UTF16 on Windows, we should
    106   /// always use UTF16 for Windows, which is the Windows official encoding for
    107   /// international characters.
    108   llvm::sys::WindowsEncodingMethod getResponseFileEncoding() const {
    109     return ResponseEncoding;
    110   }
    111   /// \brief Returns which prefix to use when passing the name of a response
    112   /// file as a parameter to this tool.
    113   const char *getResponseFileFlag() const { return ResponseFlag; }
    114 
    115   /// \brief Does this tool have "good" standardized diagnostics, or should the
    116   /// driver add an additional "command failed" diagnostic on failures.
    117   virtual bool hasGoodDiagnostics() const { return false; }
    118 
    119   /// ConstructJob - Construct jobs to perform the action \p JA,
    120   /// writing to \p Output and with \p Inputs, and add the jobs to
    121   /// \p C.
    122   ///
    123   /// \param TCArgs - The argument list for this toolchain, with any
    124   /// tool chain specific translations applied.
    125   /// \param LinkingOutput - If this output will eventually feed the
    126   /// linker, then this is the final output name of the linked image.
    127   virtual void ConstructJob(Compilation &C, const JobAction &JA,
    128                             const InputInfo &Output,
    129                             const InputInfoList &Inputs,
    130                             const llvm::opt::ArgList &TCArgs,
    131                             const char *LinkingOutput) const = 0;
    132 };
    133 
    134 } // end namespace driver
    135 } // end namespace clang
    136 
    137 #endif
    138