tools/gn/target_generator.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_generator.h"
   6
   7 #include "tools/gn/action_target_generator.h"
   8 #include "tools/gn/binary_target_generator.h"
   9 #include "tools/gn/build_settings.h"
  10 #include "tools/gn/config.h"
  11 #include "tools/gn/copy_target_generator.h"
  12 #include "tools/gn/err.h"
  13 #include "tools/gn/filesystem_utils.h"
  14 #include "tools/gn/functions.h"
  15 #include "tools/gn/group_target_generator.h"
  16 #include "tools/gn/parse_tree.h"
  17 #include "tools/gn/scheduler.h"
  18 #include "tools/gn/scope.h"
  19 #include "tools/gn/token.h"
  20 #include "tools/gn/value.h"
  21 #include "tools/gn/value_extractors.h"
  22 #include "tools/gn/variables.h"
  23
  24 TargetGenerator::TargetGenerator(Target* target,
  25                                  Scope* scope,
  26                                  const FunctionCallNode* function_call,
  27                                  Err* err)
  28     : target_(target),
  29       scope_(scope),
  30       function_call_(function_call),
  31       err_(err) {
  32 }
  33
  34 TargetGenerator::~TargetGenerator() {
  35 }
  36
  37 void TargetGenerator::Run() {
  38   // All target types use these.
  39   if (!FillDependentConfigs())
  40     return;
  41
  42   if (!FillData())
  43     return;
  44
  45   if (!FillDependencies())
  46     return;
  47
  48   if (!FillTestonly())
  49     return;
  50
  51   if (!Visibility::FillItemVisibility(target_, scope_, err_))
  52     return;
  53
  54   // Do type-specific generation.
  55   DoRun();
  56 }
  57
  58 // static
  59 void TargetGenerator::GenerateTarget(Scope* scope,
  60                                      const FunctionCallNode* function_call,
  61                                      const std::vector<Value>& args,
  62                                      const std::string& output_type,
  63                                      Err* err) {
  64   // Name is the argument to the function.
  65   if (args.size() != 1u || args[0].type() != Value::STRING) {
  66     *err = Err(function_call,
  67         "Target generator requires one string argument.",
  68         "Otherwise I'm not sure what to call this target.");
  69     return;
  70   }
  71
  72   // The location of the target is the directory name with no slash at the end.
  73   // FIXME(brettw) validate name.
  74   const Label& toolchain_label = ToolchainLabelForScope(scope);
  75   Label label(scope->GetSourceDir(), args[0].string_value(),
  76               toolchain_label.dir(), toolchain_label.name());
  77
  78   if (g_scheduler->verbose_logging())
  79     g_scheduler->Log("Defining target", label.GetUserVisibleName(true));
  80
  81   scoped_ptr<Target> target(new Target(scope->settings(), label));
  82   target->set_defined_from(function_call);
  83
  84   // Create and call out to the proper generator.
  85   if (output_type == functions::kCopy) {
  86     CopyTargetGenerator generator(target.get(), scope, function_call, err);
  87     generator.Run();
  88   } else if (output_type == functions::kAction) {
  89     ActionTargetGenerator generator(target.get(), scope, function_call,
  90                                     Target::ACTION, err);
  91     generator.Run();
  92   } else if (output_type == functions::kActionForEach) {
  93     ActionTargetGenerator generator(target.get(), scope, function_call,
  94                                     Target::ACTION_FOREACH, err);
  95     generator.Run();
  96   } else if (output_type == functions::kExecutable) {
  97     BinaryTargetGenerator generator(target.get(), scope, function_call,
  98                                     Target::EXECUTABLE, err);
  99     generator.Run();
 100   } else if (output_type == functions::kGroup) {
 101     GroupTargetGenerator generator(target.get(), scope, function_call, err);
 102     generator.Run();
 103   } else if (output_type == functions::kSharedLibrary) {
 104     BinaryTargetGenerator generator(target.get(), scope, function_call,
 105                                     Target::SHARED_LIBRARY, err);
 106     generator.Run();
 107   } else if (output_type == functions::kSourceSet) {
 108     BinaryTargetGenerator generator(target.get(), scope, function_call,
 109                                     Target::SOURCE_SET, err);
 110     generator.Run();
 111   } else if (output_type == functions::kStaticLibrary) {
 112     BinaryTargetGenerator generator(target.get(), scope, function_call,
 113                                     Target::STATIC_LIBRARY, err);
 114     generator.Run();
 115   } else {
 116     *err = Err(function_call, "Not a known output type",
 117                "I am very confused.");
 118   }
 119
 120   if (err->has_error())
 121     return;
 122
 123   // Save this target for the file.
 124   Scope::ItemVector* collector = scope->GetItemCollector();
 125   if (!collector) {
 126     *err = Err(function_call, "Can't define a target in this context.");
 127     return;
 128   }
 129   collector->push_back(new scoped_ptr<Item>(target.PassAs<Item>()));
 130 }
 131
 132 const BuildSettings* TargetGenerator::GetBuildSettings() const {
 133   return scope_->settings()->build_settings();
 134 }
 135
 136 bool TargetGenerator::FillSources() {
 137   const Value* value = scope_->GetValue(variables::kSources, true);
 138   if (!value)
 139     return true;
 140
 141   Target::FileList dest_sources;
 142   if (!ExtractListOfRelativeFiles(scope_->settings()->build_settings(), *value,
 143                                   scope_->GetSourceDir(), &dest_sources, err_))
 144     return false;
 145   target_->sources().swap(dest_sources);
 146   return true;
 147 }
 148
 149 bool TargetGenerator::FillPublic() {
 150   const Value* value = scope_->GetValue(variables::kPublic, true);
 151   if (!value)
 152     return true;
 153
 154   // If the public headers are defined, don't default to public.
 155   target_->set_all_headers_public(false);
 156
 157   Target::FileList dest_public;
 158   if (!ExtractListOfRelativeFiles(scope_->settings()->build_settings(), *value,
 159                                   scope_->GetSourceDir(), &dest_public, err_))
 160     return false;
 161   target_->public_headers().swap(dest_public);
 162   return true;
 163 }
 164
 165 bool TargetGenerator::FillInputs() {
 166   const Value* value = scope_->GetValue(variables::kInputs, true);
 167  if (!value) {
 168     // Older versions used "source_prereqs". Allow use of this variable until
 169     // all callers are updated.
 170     // TODO(brettw) remove this eventually.
 171     value = scope_->GetValue("source_prereqs", true);
 172     if (!value)
 173       return true;
 174   }
 175
 176   Target::FileList dest_inputs;
 177   if (!ExtractListOfRelativeFiles(scope_->settings()->build_settings(), *value,
 178                                   scope_->GetSourceDir(), &dest_inputs, err_))
 179     return false;
 180   target_->inputs().swap(dest_inputs);
 181   return true;
 182 }
 183
 184 bool TargetGenerator::FillConfigs() {
 185   return FillGenericConfigs(variables::kConfigs, &target_->configs());
 186 }
 187
 188 bool TargetGenerator::FillDependentConfigs() {
 189   if (!FillGenericConfigs(variables::kAllDependentConfigs,
 190                           &target_->all_dependent_configs()))
 191     return false;
 192   if (!FillGenericConfigs(variables::kPublicConfigs,
 193                           &target_->public_configs()))
 194     return false;
 195
 196   // "public_configs" was previously named "direct_dependent_configs", fall
 197   // back to that if public_configs was undefined.
 198   if (!scope_->GetValue(variables::kPublicConfigs, false)) {
 199     if (!FillGenericConfigs("direct_dependent_configs",
 200                             &target_->public_configs()))
 201       return false;
 202   }
 203   return true;
 204 }
 205
 206 bool TargetGenerator::FillData() {
 207   const Value* value = scope_->GetValue(variables::kData, true);
 208   if (!value)
 209     return true;
 210
 211   Target::FileList dest_data;
 212   if (!ExtractListOfRelativeFiles(scope_->settings()->build_settings(), *value,
 213                                   scope_->GetSourceDir(), &dest_data, err_))
 214     return false;
 215   target_->data().swap(dest_data);
 216   return true;
 217 }
 218
 219 bool TargetGenerator::FillDependencies() {
 220   if (!FillGenericDeps(variables::kDeps, &target_->private_deps()))
 221     return false;
 222   if (!FillGenericDeps(variables::kPublicDeps, &target_->public_deps()))
 223     return false;
 224   if (!FillGenericDeps(variables::kDataDeps, &target_->data_deps()))
 225     return false;
 226
 227   // "data_deps" was previously named "datadeps". For backwards-compat, read
 228   // the old one if no "data_deps" were specified.
 229   if (!scope_->GetValue(variables::kDataDeps, false)) {
 230     if (!FillGenericDeps("datadeps", &target_->data_deps()))
 231       return false;
 232   }
 233
 234   // This is a list of dependent targets to have their configs fowarded, so
 235   // it goes here rather than in FillConfigs.
 236   if (!FillForwardDependentConfigs())
 237     return false;
 238   return true;
 239 }
 240
 241 bool TargetGenerator::FillTestonly() {
 242   const Value* value = scope_->GetValue(variables::kTestonly, true);
 243   if (value) {
 244     if (!value->VerifyTypeIs(Value::BOOLEAN, err_))
 245       return false;
 246     target_->set_testonly(value->boolean_value());
 247   }
 248   return true;
 249 }
 250
 251 bool TargetGenerator::FillOutputs(bool allow_substitutions) {
 252   const Value* value = scope_->GetValue(variables::kOutputs, true);
 253   if (!value)
 254     return true;
 255
 256   SubstitutionList& outputs = target_->action_values().outputs();
 257   if (!outputs.Parse(*value, err_))
 258     return false;
 259
 260   if (!allow_substitutions) {
 261     // Verify no substitutions were actually used.
 262     if (!outputs.required_types().empty()) {
 263       *err_ = Err(*value, "Source expansions not allowed here.",
 264           "The outputs of this target used source {{expansions}} but this "
 265           "targe type\ndoesn't support them. Just express the outputs "
 266           "literally.");
 267       return false;
 268     }
 269   }
 270
 271   // Check the substitutions used are valid for this purpose.
 272   if (!EnsureValidSourcesSubstitutions(outputs.required_types(),
 273                                        value->origin(), err_))
 274     return false;
 275
 276   // Validate that outputs are in the output dir.
 277   CHECK(outputs.list().size() == value->list_value().size());
 278   for (size_t i = 0; i < outputs.list().size(); i++) {
 279     if (!EnsureSubstitutionIsInOutputDir(outputs.list()[i],
 280                                          value->list_value()[i]))
 281       return false;
 282   }
 283   return true;
 284 }
 285
 286 bool TargetGenerator::EnsureSubstitutionIsInOutputDir(
 287     const SubstitutionPattern& pattern,
 288     const Value& original_value) {
 289   if (pattern.ranges().empty()) {
 290     // Pattern is empty, error out (this prevents weirdness below).
 291     *err_ = Err(original_value, "This has an empty value in it.");
 292     return false;
 293   }
 294
 295   if (pattern.ranges()[0].type == SUBSTITUTION_LITERAL) {
 296     // If the first thing is a literal, it must start with the output dir.
 297     if (!EnsureStringIsInOutputDir(
 298             GetBuildSettings()->build_dir(),
 299             pattern.ranges()[0].literal, original_value.origin(), err_))
 300       return false;
 301   } else {
 302     // Otherwise, the first subrange must be a pattern that expands to
 303     // something in the output directory.
 304     if (!SubstitutionIsInOutputDir(pattern.ranges()[0].type)) {
 305       *err_ = Err(original_value,
 306           "File is not inside output directory.",
 307           "The given file should be in the output directory. Normally you\n"
 308           "would specify\n\"$target_out_dir/foo\" or "
 309           "\"{{source_gen_dir}}/foo\".");
 310       return false;
 311     }
 312   }
 313
 314   return true;
 315 }
 316
 317 bool TargetGenerator::FillGenericConfigs(const char* var_name,
 318                                          UniqueVector<LabelConfigPair>* dest) {
 319   const Value* value = scope_->GetValue(var_name, true);
 320   if (value) {
 321     ExtractListOfUniqueLabels(*value, scope_->GetSourceDir(),
 322                               ToolchainLabelForScope(scope_), dest, err_);
 323   }
 324   return !err_->has_error();
 325 }
 326
 327 bool TargetGenerator::FillGenericDeps(const char* var_name,
 328                                       LabelTargetVector* dest) {
 329   const Value* value = scope_->GetValue(var_name, true);
 330   if (value) {
 331     ExtractListOfLabels(*value, scope_->GetSourceDir(),
 332                         ToolchainLabelForScope(scope_), dest, err_);
 333   }
 334   return !err_->has_error();
 335 }
 336
 337 bool TargetGenerator::FillForwardDependentConfigs() {
 338   const Value* value = scope_->GetValue(
 339       variables::kForwardDependentConfigsFrom, true);
 340   if (value) {
 341     ExtractListOfUniqueLabels(*value, scope_->GetSourceDir(),
 342                               ToolchainLabelForScope(scope_),
 343                               &target_->forward_dependent_configs(), err_);
 344   }
 345   return !err_->has_error();
 346 }