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.
5 #include "tools/gn/target.h"
8 #include "base/strings/string_util.h"
9 #include "base/strings/stringprintf.h"
10 #include "tools/gn/config_values_extractors.h"
11 #include "tools/gn/deps_iterator.h"
12 #include "tools/gn/filesystem_utils.h"
13 #include "tools/gn/scheduler.h"
14 #include "tools/gn/substitution_writer.h"
18 typedef std::set<const Config*> ConfigSet;
20 // Merges the public configs from the given target to the given config list.
21 void MergePublicConfigsFrom(const Target* from_target,
22 UniqueVector<LabelConfigPair>* dest) {
23 const UniqueVector<LabelConfigPair>& pub = from_target->public_configs();
24 dest->Append(pub.begin(), pub.end());
27 // Like MergePublicConfigsFrom above except does the "all dependent" ones. This
28 // additionally adds all configs to the all_dependent_configs_ of the dest
29 // target given in *all_dest.
30 void MergeAllDependentConfigsFrom(const Target* from_target,
31 UniqueVector<LabelConfigPair>* dest,
32 UniqueVector<LabelConfigPair>* all_dest) {
33 for (const auto& pair : from_target->all_dependent_configs()) {
34 all_dest->push_back(pair);
35 dest->push_back(pair);
39 Err MakeTestOnlyError(const Target* from, const Target* to) {
40 return Err(from->defined_from(), "Test-only dependency not allowed.",
41 from->label().GetUserVisibleName(false) + "\n"
42 "which is NOT marked testonly can't depend on\n" +
43 to->label().GetUserVisibleName(false) + "\n"
44 "which is marked testonly. Only targets with \"testonly = true\"\n"
45 "can depend on other test-only targets.\n"
47 "Either mark it test-only or don't do this dependency.");
50 Err MakeStaticLibDepsError(const Target* from, const Target* to) {
51 return Err(from->defined_from(),
52 "Complete static libraries can't depend on static libraries.",
53 from->label().GetUserVisibleName(false) +
55 "which is a complete static library can't depend on\n" +
56 to->label().GetUserVisibleName(false) +
58 "which is a static library.\n"
60 "Use source sets for intermediate targets instead.");
65 Target::Target(const Settings* settings, const Label& label)
66 : Item(settings, label),
67 output_type_(UNKNOWN),
68 all_headers_public_(true),
69 check_includes_(true),
70 complete_static_lib_(false),
80 const char* Target::GetStringForOutputType(OutputType type) {
89 return "Shared library";
91 return "Static library";
99 return "ActionForEach";
105 Target* Target::AsTarget() {
109 const Target* Target::AsTarget() const {
113 bool Target::OnResolved(Err* err) {
114 DCHECK(output_type_ != UNKNOWN);
115 DCHECK(toolchain_) << "Toolchain should have been set before resolving.";
117 // Copy our own dependent configs to the list of configs applying to us.
118 configs_.Append(all_dependent_configs_.begin(), all_dependent_configs_.end());
119 MergePublicConfigsFrom(this, &configs_);
121 // Copy our own libs and lib_dirs to the final set. This will be from our
122 // target and all of our configs. We do this specially since these must be
123 // inherited through the dependency tree (other flags don't work this way).
124 for (ConfigValuesIterator iter(this); !iter.done(); iter.Next()) {
125 const ConfigValues& cur = iter.cur();
126 all_lib_dirs_.append(cur.lib_dirs().begin(), cur.lib_dirs().end());
127 all_libs_.append(cur.libs().begin(), cur.libs().end());
130 PullDependentTargetInfo();
131 PullForwardedDependentConfigs();
132 PullRecursiveHardDeps();
136 if (!CheckVisibility(err))
138 if (!CheckTestonly(err))
140 if (!CheckNoNestedStaticLibs(err))
146 bool Target::IsLinkable() const {
147 return output_type_ == STATIC_LIBRARY || output_type_ == SHARED_LIBRARY;
150 bool Target::IsFinal() const {
151 return output_type_ == EXECUTABLE || output_type_ == SHARED_LIBRARY ||
152 (output_type_ == STATIC_LIBRARY && complete_static_lib_);
155 DepsIteratorRange Target::GetDeps(DepsIterationType type) const {
156 if (type == DEPS_LINKED) {
157 return DepsIteratorRange(DepsIterator(
158 &public_deps_, &private_deps_, nullptr));
161 return DepsIteratorRange(DepsIterator(
162 &public_deps_, &private_deps_, &data_deps_));
165 std::string Target::GetComputedOutputName(bool include_prefix) const {
167 << "Toolchain must be specified before getting the computed output name.";
169 const std::string& name = output_name_.empty() ? label().name()
173 if (include_prefix) {
174 const Tool* tool = toolchain_->GetToolForTargetFinalOutput(this);
175 const std::string& prefix = tool->output_prefix();
176 // Only add the prefix if the name doesn't already have it.
177 if (!StartsWithASCII(name, prefix, true))
185 bool Target::SetToolchain(const Toolchain* toolchain, Err* err) {
187 DCHECK_NE(UNKNOWN, output_type_);
188 toolchain_ = toolchain;
190 const Tool* tool = toolchain->GetToolForTargetFinalOutput(this);
194 // Tool not specified for this target type.
196 *err = Err(defined_from(), "This target uses an undefined tool.",
200 "uses toolchain %s\n"
201 "which doesn't have the tool \"%s\" defined.\n\n"
202 "Alas, I can not continue.",
203 label().GetUserVisibleName(false).c_str(),
204 GetStringForOutputType(output_type_),
205 label().GetToolchainLabel().GetUserVisibleName(false).c_str(),
206 Toolchain::ToolTypeToName(
207 toolchain->GetToolTypeForTargetFinalOutput(this)).c_str()));
212 void Target::PullDependentTargetInfo() {
213 // Gather info from our dependents we need.
214 for (const auto& pair : GetDeps(DEPS_LINKED)) {
215 const Target* dep = pair.ptr;
216 MergeAllDependentConfigsFrom(dep, &configs_, &all_dependent_configs_);
217 MergePublicConfigsFrom(dep, &configs_);
219 // Direct dependent libraries.
220 if (dep->output_type() == STATIC_LIBRARY ||
221 dep->output_type() == SHARED_LIBRARY ||
222 dep->output_type() == SOURCE_SET)
223 inherited_libraries_.push_back(dep);
225 // Inherited libraries and flags are inherited across static library
227 if (!dep->IsFinal()) {
228 inherited_libraries_.Append(dep->inherited_libraries().begin(),
229 dep->inherited_libraries().end());
231 // Inherited library settings.
232 all_lib_dirs_.append(dep->all_lib_dirs());
233 all_libs_.append(dep->all_libs());
238 void Target::PullForwardedDependentConfigs() {
239 // Pull public configs from each of our dependency's public deps.
240 for (const auto& dep : public_deps_)
241 PullForwardedDependentConfigsFrom(dep.ptr);
243 // Forward public configs if explicitly requested.
244 for (const auto& dep : forward_dependent_configs_) {
245 const Target* from_target = dep.ptr;
247 // The forward_dependent_configs_ must be in the deps (public or private)
248 // already, so we don't need to bother copying to our configs, only
250 DCHECK(std::find_if(private_deps_.begin(), private_deps_.end(),
251 LabelPtrPtrEquals<Target>(from_target)) !=
252 private_deps_.end() ||
253 std::find_if(public_deps_.begin(), public_deps_.end(),
254 LabelPtrPtrEquals<Target>(from_target)) !=
257 PullForwardedDependentConfigsFrom(from_target);
261 void Target::PullForwardedDependentConfigsFrom(const Target* from) {
262 public_configs_.Append(from->public_configs().begin(),
263 from->public_configs().end());
266 void Target::PullRecursiveHardDeps() {
267 for (const auto& pair : GetDeps(DEPS_LINKED)) {
268 if (pair.ptr->hard_dep())
269 recursive_hard_deps_.insert(pair.ptr);
271 // Android STL doesn't like insert(begin, end) so do it manually.
272 // TODO(brettw) this can be changed to
273 // insert(iter.target()->begin(), iter.target()->end())
274 // when Android uses a better STL.
275 for (std::set<const Target*>::const_iterator cur =
276 pair.ptr->recursive_hard_deps().begin();
277 cur != pair.ptr->recursive_hard_deps().end(); ++cur)
278 recursive_hard_deps_.insert(*cur);
282 void Target::FillOutputFiles() {
283 const Tool* tool = toolchain_->GetToolForTargetFinalOutput(this);
284 switch (output_type_) {
289 case ACTION_FOREACH: {
290 // These don't get linked to and use stamps which should be the first
291 // entry in the outputs. These stamps are named
292 // "<target_out_dir>/<targetname>.stamp".
293 dependency_output_file_ = GetTargetOutputDirAsOutputFile(this);
294 dependency_output_file_.value().append(GetComputedOutputName(true));
295 dependency_output_file_.value().append(".stamp");
299 // Executables don't get linked to, but the first output is used for
300 // dependency management.
301 CHECK_GE(tool->outputs().list().size(), 1u);
302 dependency_output_file_ =
303 SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
304 this, tool, tool->outputs().list()[0]);
307 // Static libraries both have dependencies and linking going off of the
309 CHECK(tool->outputs().list().size() >= 1);
310 link_output_file_ = dependency_output_file_ =
311 SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
312 this, tool, tool->outputs().list()[0]);
315 CHECK(tool->outputs().list().size() >= 1);
316 if (tool->link_output().empty() && tool->depend_output().empty()) {
317 // Default behavior, use the first output file for both.
318 link_output_file_ = dependency_output_file_ =
319 SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
320 this, tool, tool->outputs().list()[0]);
322 // Use the tool-specified ones.
323 if (!tool->link_output().empty()) {
325 SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
326 this, tool, tool->link_output());
328 if (!tool->depend_output().empty()) {
329 dependency_output_file_ =
330 SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
331 this, tool, tool->depend_output());
341 bool Target::CheckVisibility(Err* err) const {
342 for (const auto& pair : GetDeps(DEPS_ALL)) {
343 if (!Visibility::CheckItemVisibility(this, pair.ptr, err))
349 bool Target::CheckTestonly(Err* err) const {
350 // If the current target is marked testonly, it can include both testonly
351 // and non-testonly targets, so there's nothing to check.
355 // Verify no deps have "testonly" set.
356 for (const auto& pair : GetDeps(DEPS_ALL)) {
357 if (pair.ptr->testonly()) {
358 *err = MakeTestOnlyError(this, pair.ptr);
366 bool Target::CheckNoNestedStaticLibs(Err* err) const {
367 // If the current target is not a complete static library, it can depend on
368 // static library targets with no problem.
369 if (!(output_type() == Target::STATIC_LIBRARY && complete_static_lib()))
372 // Verify no deps are static libraries.
373 for (const auto& pair : GetDeps(DEPS_ALL)) {
374 if (pair.ptr->output_type() == Target::STATIC_LIBRARY) {
375 *err = MakeStaticLibDepsError(this, pair.ptr);
380 // Verify no inherited libraries are static libraries.
381 for (const auto& lib : inherited_libraries()) {
382 if (lib->output_type() == Target::STATIC_LIBRARY) {
383 *err = MakeStaticLibDepsError(this, lib);