tools/gn/target.cc

   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 #include "tools/gn/target.h"
   6
   7 #include "base/bind.h"
   8 #include "tools/gn/config_values_extractors.h"
   9 #include "tools/gn/scheduler.h"
  10
  11 namespace {
  12
  13 typedef std::set<const Config*> ConfigSet;
  14
  15 // Merges the dependent configs from the given target to the given config list.
  16 // The unique_configs list is used for de-duping so values already added will
  17 // not be added again.
  18 void MergeDirectDependentConfigsFrom(const Target* from_target,
  19                                      ConfigSet* unique_configs,
  20                                      LabelConfigVector* dest) {
  21   const LabelConfigVector& direct = from_target->direct_dependent_configs();
  22   for (size_t i = 0; i < direct.size(); i++) {
  23     if (unique_configs->find(direct[i].ptr) == unique_configs->end()) {
  24       unique_configs->insert(direct[i].ptr);
  25       dest->push_back(direct[i]);
  26     }
  27   }
  28 }
  29
  30 // Like MergeDirectDependentConfigsFrom above except does the "all dependent"
  31 // ones. This additionally adds all configs to the all_dependent_configs_ of
  32 // the dest target given in *all_dest.
  33 void MergeAllDependentConfigsFrom(const Target* from_target,
  34                                   ConfigSet* unique_configs,
  35                                   LabelConfigVector* dest,
  36                                   LabelConfigVector* all_dest) {
  37   const LabelConfigVector& all = from_target->all_dependent_configs();
  38   for (size_t i = 0; i < all.size(); i++) {
  39     // Always add it to all_dependent_configs_ since it might not be in that
  40     // list even if we've seen it applied to this target before. This may
  41     // introduce some duplicates in all_dependent_configs_, but those will
  42     // we removed when they're actually applied to a target.
  43     all_dest->push_back(all[i]);
  44     if (unique_configs->find(all[i].ptr) == unique_configs->end()) {
  45       // One we haven't seen yet, also apply it to ourselves.
  46       dest->push_back(all[i]);
  47       unique_configs->insert(all[i].ptr);
  48     }
  49   }
  50 }
  51
  52 }  // namespace
  53
  54 Target::Target(const Settings* settings, const Label& label)
  55     : Item(settings, label),
  56       output_type_(UNKNOWN),
  57       all_headers_public_(true),
  58       hard_dep_(false) {
  59 }
  60
  61 Target::~Target() {
  62 }
  63
  64 // static
  65 const char* Target::GetStringForOutputType(OutputType type) {
  66   switch (type) {
  67     case UNKNOWN:
  68       return "Unknown";
  69     case GROUP:
  70       return "Group";
  71     case EXECUTABLE:
  72       return "Executable";
  73     case SHARED_LIBRARY:
  74       return "Shared library";
  75     case STATIC_LIBRARY:
  76       return "Static library";
  77     case COPY_FILES:
  78       return "Copy";
  79     case ACTION:
  80       return "Action";
  81     case ACTION_FOREACH:
  82       return "ActionForEach";
  83     default:
  84       return "";
  85   }
  86 }
  87
  88 Target* Target::AsTarget() {
  89   return this;
  90 }
  91
  92 const Target* Target::AsTarget() const {
  93   return this;
  94 }
  95
  96 void Target::OnResolved() {
  97   DCHECK(output_type_ != UNKNOWN);
  98
  99   // Convert any groups we depend on to just direct dependencies on that
 100   // group's deps. We insert the new deps immediately after the group so that
 101   // the ordering is preserved. We need to keep the original group so that any
 102   // flags, etc. that it specifies itself are applied to us.
 103   size_t original_deps_size = deps_.size();
 104   for (size_t i = 0; i < original_deps_size; i++) {
 105     const Target* dep = deps_[i].ptr;
 106     if (dep->output_type_ == GROUP) {
 107       deps_.insert(deps_.begin() + i + 1, dep->deps_.begin(), dep->deps_.end());
 108       i += dep->deps_.size();
 109     }
 110   }
 111
 112   // Only add each config once. First remember the target's configs.
 113   ConfigSet unique_configs;
 114   for (size_t i = 0; i < configs_.size(); i++)
 115     unique_configs.insert(configs_[i].ptr);
 116
 117   // Copy our own dependent configs to the list of configs applying to us.
 118   for (size_t i = 0; i < all_dependent_configs_.size(); i++) {
 119     if (unique_configs.find(all_dependent_configs_[i].ptr) ==
 120         unique_configs.end()) {
 121       unique_configs.insert(all_dependent_configs_[i].ptr);
 122       configs_.push_back(all_dependent_configs_[i]);
 123     }
 124   }
 125   for (size_t i = 0; i < direct_dependent_configs_.size(); i++) {
 126     if (unique_configs.find(direct_dependent_configs_[i].ptr) ==
 127         unique_configs.end()) {
 128       unique_configs.insert(direct_dependent_configs_[i].ptr);
 129       configs_.push_back(direct_dependent_configs_[i]);
 130     }
 131   }
 132
 133   // Copy our own libs and lib_dirs to the final set. This will be from our
 134   // target and all of our configs. We do this specially since these must be
 135   // inherited through the dependency tree (other flags don't work this way).
 136   for (ConfigValuesIterator iter(this); !iter.done(); iter.Next()) {
 137     const ConfigValues& cur = iter.cur();
 138     all_lib_dirs_.append(cur.lib_dirs().begin(), cur.lib_dirs().end());
 139     all_libs_.append(cur.libs().begin(), cur.libs().end());
 140   }
 141
 142   if (output_type_ != GROUP) {
 143     // Don't pull target info like libraries and configs from dependencies into
 144     // a group target. When A depends on a group G, the G's dependents will
 145     // be treated as direct dependencies of A, so this is unnecessary and will
 146     // actually result in duplicated settings (since settings will also be
 147     // pulled from G to A in case G has configs directly on it).
 148     PullDependentTargetInfo(&unique_configs);
 149   }
 150 }
 151
 152 bool Target::IsLinkable() const {
 153   return output_type_ == STATIC_LIBRARY || output_type_ == SHARED_LIBRARY;
 154 }
 155
 156 void Target::PullDependentTargetInfo(std::set<const Config*>* unique_configs) {
 157   // Gather info from our dependents we need.
 158   for (size_t dep_i = 0; dep_i < deps_.size(); dep_i++) {
 159     const Target* dep = deps_[dep_i].ptr;
 160     MergeAllDependentConfigsFrom(dep, unique_configs, &configs_,
 161                                  &all_dependent_configs_);
 162     MergeDirectDependentConfigsFrom(dep, unique_configs, &configs_);
 163
 164     // Direct dependent libraries.
 165     if (dep->output_type() == STATIC_LIBRARY ||
 166         dep->output_type() == SHARED_LIBRARY ||
 167         dep->output_type() == SOURCE_SET)
 168       inherited_libraries_.insert(dep);
 169
 170     // Inherited libraries and flags are inherited across static library
 171     // boundaries.
 172     if (dep->output_type() != SHARED_LIBRARY &&
 173         dep->output_type() != EXECUTABLE) {
 174       const std::set<const Target*> inherited = dep->inherited_libraries();
 175       for (std::set<const Target*>::const_iterator i = inherited.begin();
 176            i != inherited.end(); ++i)
 177         inherited_libraries_.insert(*i);
 178
 179       // Inherited library settings.
 180       all_lib_dirs_.append(dep->all_lib_dirs());
 181       all_libs_.append(dep->all_libs());
 182     }
 183   }
 184
 185   // Forward direct dependent configs if requested.
 186   for (size_t dep = 0; dep < forward_dependent_configs_.size(); dep++) {
 187     const Target* from_target = forward_dependent_configs_[dep].ptr;
 188
 189     // The forward_dependent_configs_ must be in the deps already, so we
 190     // don't need to bother copying to our configs, only forwarding.
 191     DCHECK(std::find_if(deps_.begin(), deps_.end(),
 192                         LabelPtrPtrEquals<Target>(from_target)) !=
 193            deps_.end());
 194     direct_dependent_configs_.insert(
 195         direct_dependent_configs_.end(),
 196         from_target->direct_dependent_configs().begin(),
 197         from_target->direct_dependent_configs().end());
 198   }
 199 }