Home | History | Annotate | Download | only in gn 
      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef TOOLS_GN_SETTINGS_H_
      6 #define TOOLS_GN_SETTINGS_H_
      7 
      8 #include "base/files/file_path.h"
      9 #include "tools/gn/build_settings.h"
     10 #include "tools/gn/import_manager.h"
     11 #include "tools/gn/output_file.h"
     12 #include "tools/gn/scope.h"
     13 #include "tools/gn/source_dir.h"
     14 #include "tools/gn/toolchain.h"
     15 
     16 // Holds the settings for one toolchain invocation. There will be one
     17 // Settings object for each toolchain type, each referring to the same
     18 // BuildSettings object for shared stuff.
     19 //
     20 // The Settings object is const once it is constructed, which allows us to
     21 // use it from multiple threads during target generation without locking (which
     22 // is important, because it gets used a lot).
     23 //
     24 // The Toolchain object holds the set of stuff that is set by the toolchain
     25 // declaration, which obviously needs to be set later when we actually parse
     26 // the file with the toolchain declaration in it.
     27 class Settings {
     28  public:
     29   enum TargetOS {
     30     UNKNOWN,
     31     LINUX,
     32     MAC,
     33     WIN
     34   };
     35 
     36   // Constructs a toolchain settings. The output_subdir_name is the name we
     37   // should use for the subdirectory in the build output directory for this
     38   // toolchain's outputs. It should have no slashes in it. The default
     39   // toolchain should use an empty string.
     40   Settings(const BuildSettings* build_settings,
     41            const std::string& output_subdir_name);
     42   ~Settings();
     43 
     44   const BuildSettings* build_settings() const { return build_settings_; }
     45 
     46   const Label& toolchain_label() const { return toolchain_label_; }
     47   void set_toolchain_label(const Label& l) { toolchain_label_ = l; }
     48 
     49   const Label& default_toolchain_label() const {
     50     return default_toolchain_label_;
     51   }
     52   void set_default_toolchain_label(const Label& default_label) {
     53     default_toolchain_label_ = default_label;
     54   }
     55 
     56   // Indicates if this corresponds to the default toolchain.
     57   bool is_default() const {
     58     return toolchain_label_ == default_toolchain_label_;
     59   }
     60 
     61   bool IsMac() const { return target_os_ == MAC; }
     62   bool IsLinux() const { return target_os_ == LINUX; }
     63   bool IsWin() const { return target_os_ == WIN; }
     64 
     65   TargetOS target_os() const { return target_os_; }
     66   void set_target_os(TargetOS t) { target_os_ = t; }
     67 
     68   const OutputFile& toolchain_output_subdir() const {
     69     return toolchain_output_subdir_;
     70   }
     71   const SourceDir& toolchain_output_dir() const {
     72     return toolchain_output_dir_;
     73   }
     74 
     75   // Directory for generated files.
     76   const SourceDir& toolchain_gen_dir() const {
     77     return toolchain_gen_dir_;
     78   }
     79 
     80   // The import manager caches the result of executing imported files in the
     81   // context of a given settings object.
     82   //
     83   // See the ItemTree getter in GlobalSettings for why this doesn't return a
     84   // const pointer.
     85   ImportManager& import_manager() const { return import_manager_; }
     86 
     87   const Scope* base_config() const { return &base_config_; }
     88   Scope* base_config() { return &base_config_; }
     89 
     90   // Set to true when every target we encounter should be generated. False
     91   // means that only targets that have a dependency from (directly or
     92   // indirectly) some magic root node are actually generated. See the comments
     93   // on ItemTree for more.
     94   bool greedy_target_generation() const {
     95     return greedy_target_generation_;
     96   }
     97   void set_greedy_target_generation(bool gtg) {
     98     greedy_target_generation_ = gtg;
     99   }
    100 
    101  private:
    102   const BuildSettings* build_settings_;
    103 
    104   Label toolchain_label_;
    105   Label default_toolchain_label_;
    106 
    107   TargetOS target_os_;
    108 
    109   mutable ImportManager import_manager_;
    110 
    111   // The subdirectory inside the build output for this toolchain. For the
    112   // default toolchain, this will be empty (since the deafult toolchain's
    113   // output directory is the same as the build directory). When nonempty, this
    114   // is guaranteed to end in a slash.
    115   OutputFile toolchain_output_subdir_;
    116 
    117   // Full source file path to the toolchain output directory.
    118   SourceDir toolchain_output_dir_;
    119 
    120   SourceDir toolchain_gen_dir_;
    121 
    122   Scope base_config_;
    123 
    124   bool greedy_target_generation_;
    125 
    126   DISALLOW_COPY_AND_ASSIGN(Settings);
    127 };
    128 
    129 #endif  // TOOLS_GN_SETTINGS_H_
    130