| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <stddef.h> |
| |
| #include <map> |
| #include <set> |
| |
| #include "base/command_line.h" |
| #include "base/files/file_util.h" |
| #include "base/strings/string_split.h" |
| #include "base/strings/string_util.h" |
| #include "gn/commands.h" |
| #include "gn/config_values_extractors.h" |
| #include "gn/deps_iterator.h" |
| #include "gn/filesystem_utils.h" |
| #include "gn/input_file.h" |
| #include "gn/item.h" |
| #include "gn/setup.h" |
| #include "gn/standard_out.h" |
| #include "gn/switches.h" |
| #include "gn/target.h" |
| |
| namespace commands { |
| |
| namespace { |
| |
| using TargetSet = std::set<const Target*>; |
| using TargetVector = std::vector<const Target*>; |
| |
| // Maps targets to the list of targets that depend on them. |
| using DepMap = std::multimap<const Target*, const Target*>; |
| |
| // Populates the reverse dependency map for the targets in the Setup. |
| void FillDepMap(Setup* setup, DepMap* dep_map) { |
| for (auto* target : setup->builder().GetAllResolvedTargets()) { |
| for (const auto& dep_pair : target->GetDeps(Target::DEPS_ALL)) |
| dep_map->insert(std::make_pair(dep_pair.ptr, target)); |
| } |
| } |
| |
| // Forward declaration for function below. |
| size_t RecursivePrintTargetDeps(const DepMap& dep_map, |
| const Target* target, |
| TargetSet* seen_targets, |
| int indent_level); |
| |
| // Prints the target and its dependencies in tree form. If the set is non-null, |
| // new targets encountered will be added to the set, and if a ref is in the set |
| // already, it will not be recused into. When the set is null, all refs will be |
| // printed. |
| // |
| // Returns the number of items printed. |
| size_t RecursivePrintTarget(const DepMap& dep_map, |
| const Target* target, |
| TargetSet* seen_targets, |
| int indent_level) { |
| std::string indent(indent_level * 2, ' '); |
| size_t count = 1; |
| |
| // Only print the toolchain for non-default-toolchain targets. |
| OutputString(indent + target->label().GetUserVisibleName( |
| !target->settings()->is_default())); |
| |
| bool print_children = true; |
| if (seen_targets) { |
| if (seen_targets->find(target) == seen_targets->end()) { |
| // New target, mark it visited. |
| seen_targets->insert(target); |
| } else { |
| // Already seen. |
| print_children = false; |
| // Only print "..." if something is actually elided, which means that |
| // the current target has children. |
| if (dep_map.lower_bound(target) != dep_map.upper_bound(target)) |
| OutputString("..."); |
| } |
| } |
| |
| OutputString("\n"); |
| if (print_children) { |
| count += RecursivePrintTargetDeps(dep_map, target, seen_targets, |
| indent_level + 1); |
| } |
| return count; |
| } |
| |
| // Prints refs of the given target (not the target itself). See |
| // RecursivePrintTarget. |
| size_t RecursivePrintTargetDeps(const DepMap& dep_map, |
| const Target* target, |
| TargetSet* seen_targets, |
| int indent_level) { |
| DepMap::const_iterator dep_begin = dep_map.lower_bound(target); |
| DepMap::const_iterator dep_end = dep_map.upper_bound(target); |
| size_t count = 0; |
| for (DepMap::const_iterator cur_dep = dep_begin; cur_dep != dep_end; |
| cur_dep++) { |
| count += RecursivePrintTarget(dep_map, cur_dep->second, seen_targets, |
| indent_level); |
| } |
| return count; |
| } |
| |
| void RecursiveCollectChildRefs(const DepMap& dep_map, |
| const Target* target, |
| TargetSet* results); |
| |
| // Recursively finds all targets that reference the given one, and additionally |
| // adds the current one to the list. |
| void RecursiveCollectRefs(const DepMap& dep_map, |
| const Target* target, |
| TargetSet* results) { |
| if (results->find(target) != results->end()) |
| return; // Already found this target. |
| results->insert(target); |
| RecursiveCollectChildRefs(dep_map, target, results); |
| } |
| |
| // Recursively finds all targets that reference the given one. |
| void RecursiveCollectChildRefs(const DepMap& dep_map, |
| const Target* target, |
| TargetSet* results) { |
| DepMap::const_iterator dep_begin = dep_map.lower_bound(target); |
| DepMap::const_iterator dep_end = dep_map.upper_bound(target); |
| for (DepMap::const_iterator cur_dep = dep_begin; cur_dep != dep_end; |
| cur_dep++) |
| RecursiveCollectRefs(dep_map, cur_dep->second, results); |
| } |
| |
| bool TargetReferencesConfig(const Target* target, const Config* config) { |
| for (const LabelConfigPair& cur : target->configs()) { |
| if (cur.ptr == config) |
| return true; |
| } |
| for (const LabelConfigPair& cur : target->public_configs()) { |
| if (cur.ptr == config) |
| return true; |
| } |
| return false; |
| } |
| |
| void GetTargetsReferencingConfig(Setup* setup, |
| const std::vector<const Target*>& all_targets, |
| const Config* config, |
| bool default_toolchain_only, |
| UniqueVector<const Target*>* matches) { |
| Label default_toolchain = setup->loader()->default_toolchain_label(); |
| for (auto* target : all_targets) { |
| if (default_toolchain_only) { |
| // Only check targets in the default toolchain. |
| if (target->label().GetToolchainLabel() != default_toolchain) |
| continue; |
| } |
| if (TargetReferencesConfig(target, config)) |
| matches->push_back(target); |
| } |
| } |
| |
| // Returns the number of matches printed. |
| size_t DoTreeOutput(const DepMap& dep_map, |
| const UniqueVector<const Target*>& implicit_target_matches, |
| const UniqueVector<const Target*>& explicit_target_matches, |
| bool all) { |
| TargetSet seen_targets; |
| size_t count = 0; |
| |
| // Implicit targets don't get printed themselves. |
| for (const Target* target : implicit_target_matches) { |
| if (all) |
| count += RecursivePrintTargetDeps(dep_map, target, nullptr, 0); |
| else |
| count += RecursivePrintTargetDeps(dep_map, target, &seen_targets, 0); |
| } |
| |
| // Explicit targets appear in the output. |
| for (const Target* target : implicit_target_matches) { |
| if (all) |
| count += RecursivePrintTarget(dep_map, target, nullptr, 0); |
| else |
| count += RecursivePrintTarget(dep_map, target, &seen_targets, 0); |
| } |
| |
| return count; |
| } |
| |
| // Returns the number of matches printed. |
| size_t DoAllListOutput( |
| const DepMap& dep_map, |
| const UniqueVector<const Target*>& implicit_target_matches, |
| const UniqueVector<const Target*>& explicit_target_matches) { |
| // Output recursive dependencies, uniquified and flattened. |
| TargetSet results; |
| |
| for (const Target* target : implicit_target_matches) |
| RecursiveCollectChildRefs(dep_map, target, &results); |
| for (const Target* target : explicit_target_matches) { |
| // Explicit targets also get added to the output themselves. |
| results.insert(target); |
| RecursiveCollectChildRefs(dep_map, target, &results); |
| } |
| |
| FilterAndPrintTargetSet(false, results); |
| return results.size(); |
| } |
| |
| // Returns the number of matches printed. |
| size_t DoDirectListOutput( |
| const DepMap& dep_map, |
| const UniqueVector<const Target*>& implicit_target_matches, |
| const UniqueVector<const Target*>& explicit_target_matches) { |
| TargetSet results; |
| |
| // Output everything that refers to the implicit ones. |
| for (const Target* target : implicit_target_matches) { |
| DepMap::const_iterator dep_begin = dep_map.lower_bound(target); |
| DepMap::const_iterator dep_end = dep_map.upper_bound(target); |
| for (DepMap::const_iterator cur_dep = dep_begin; cur_dep != dep_end; |
| cur_dep++) |
| results.insert(cur_dep->second); |
| } |
| |
| // And just output the explicit ones directly (these are the target matches |
| // when referring to what references a file or config). |
| for (const Target* target : explicit_target_matches) |
| results.insert(target); |
| |
| FilterAndPrintTargetSet(false, results); |
| return results.size(); |
| } |
| |
| } // namespace |
| |
| const char kRefs[] = "refs"; |
| const char kRefs_HelpShort[] = "refs: Find stuff referencing a target or file."; |
| const char kRefs_Help[] = |
| R"(gn refs |
| |
| gn refs <out_dir> (<label_pattern>|<label>|<file>|@<response_file>)* |
| [--all] [--default-toolchain] [--as=...] [--testonly=...] [--type=...] |
| |
| Finds reverse dependencies (which targets reference something). The input is |
| a list containing: |
| |
| - Target label: The result will be which targets depend on it. |
| |
| - Config label: The result will be which targets list the given config in |
| its "configs" or "public_configs" list. |
| |
| - Label pattern: The result will be which targets depend on any target |
| matching the given pattern. Patterns will not match configs. These are not |
| general regular expressions, see "gn help label_pattern" for details. |
| |
| - File name: The result will be which targets list the given file in its |
| "inputs", "sources", "public", "data", or "outputs". Any input that does |
| not contain wildcards and does not match a target or a config will be |
| treated as a file. |
| |
| - Response file: If the input starts with an "@", it will be interpreted as |
| a path to a file containing a list of labels or file names, one per line. |
| This allows us to handle long lists of inputs without worrying about |
| command line limits. |
| |
| Options |
| |
| --all |
| When used without --tree, will recurse and display all unique |
| dependencies of the given targets. For example, if the input is a target, |
| this will output all targets that depend directly or indirectly on the |
| input. If the input is a file, this will output all targets that depend |
| directly or indirectly on that file. |
| |
| When used with --tree, turns off eliding to show a complete tree. |
| |
| )" |
| |
| TARGET_PRINTING_MODE_COMMAND_LINE_HELP "\n" DEFAULT_TOOLCHAIN_SWITCH_HELP |
| |
| R"( |
| -q |
| Quiet. If nothing matches, don't print any output. Without this option, if |
| there are no matches there will be an informational message printed which |
| might interfere with scripts processing the output. |
| |
| )" |
| |
| TARGET_TESTONLY_FILTER_COMMAND_LINE_HELP |
| |
| R"( |
| --tree |
| Outputs a reverse dependency tree from the given target. Duplicates will |
| be elided. Combine with --all to see a full dependency tree. |
| |
| Tree output can not be used with the filtering or output flags: --as, |
| --type, --testonly. |
| |
| )" |
| |
| TARGET_TYPE_FILTER_COMMAND_LINE_HELP |
| |
| R"( |
| |
| Examples (target input) |
| |
| gn refs out/Debug //gn:gn |
| Find all targets depending on the given exact target name. |
| |
| gn refs out/Debug //base:i18n --as=buildfiles | xargs gvim |
| Edit all .gn files containing references to //base:i18n |
| |
| gn refs out/Debug //base --all |
| List all targets depending directly or indirectly on //base:base. |
| |
| gn refs out/Debug "//base/*" |
| List all targets depending directly on any target in //base or |
| its subdirectories. |
| |
| gn refs out/Debug "//base:*" |
| List all targets depending directly on any target in |
| //base/BUILD.gn. |
| |
| gn refs out/Debug //base --tree |
| Print a reverse dependency tree of //base:base |
| |
| Examples (file input) |
| |
| gn refs out/Debug //base/macros.h |
| Print target(s) listing //base/macros.h as a source. |
| |
| gn refs out/Debug //base/macros.h --tree |
| Display a reverse dependency tree to get to the given file. This |
| will show how dependencies will reference that file. |
| |
| gn refs out/Debug //base/macros.h //base/at_exit.h --all |
| Display all unique targets with some dependency path to a target |
| containing either of the given files as a source. |
| |
| gn refs out/Debug //base/macros.h --testonly=true --type=executable |
| --all --as=output |
| Display the executable file names of all test executables |
| potentially affected by a change to the given file. |
| )"; |
| |
| int RunRefs(const std::vector<std::string>& args) { |
| if (args.size() <= 1) { |
| Err(Location(), "You're holding it wrong.", |
| "Usage: \"gn refs <out_dir> (<label_pattern>|<file>)*\"") |
| .PrintToStdout(); |
| return 1; |
| } |
| |
| const base::CommandLine* cmdline = base::CommandLine::ForCurrentProcess(); |
| bool tree = cmdline->HasSwitch("tree"); |
| bool all = cmdline->HasSwitch("all"); |
| bool default_toolchain_only = cmdline->HasSwitch(switches::kDefaultToolchain); |
| |
| // Deliberately leaked to avoid expensive process teardown. |
| Setup* setup = new Setup; |
| if (!setup->DoSetup(args[0], false) || !setup->Run()) |
| return 1; |
| |
| // The inputs are everything but the first arg (which is the build dir). |
| std::vector<std::string> inputs; |
| for (size_t i = 1; i < args.size(); i++) { |
| if (args[i][0] == '@') { |
| // The argument is as a path to a response file. |
| std::string contents; |
| bool ret = |
| base::ReadFileToString(UTF8ToFilePath(args[i].substr(1)), &contents); |
| if (!ret) { |
| Err(Location(), "Response file " + args[i].substr(1) + " not found.") |
| .PrintToStdout(); |
| return 1; |
| } |
| for (const std::string& line : base::SplitString( |
| contents, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) { |
| if (!line.empty()) |
| inputs.push_back(line); |
| } |
| } else { |
| // The argument is a label or a path. |
| inputs.push_back(args[i]); |
| } |
| } |
| |
| // Get the matches for the command-line input. |
| UniqueVector<const Target*> target_matches; |
| UniqueVector<const Config*> config_matches; |
| UniqueVector<const Toolchain*> toolchain_matches; |
| UniqueVector<SourceFile> file_matches; |
| if (!ResolveFromCommandLineInput(setup, inputs, default_toolchain_only, |
| &target_matches, &config_matches, |
| &toolchain_matches, &file_matches)) |
| return 1; |
| |
| // When you give a file or config as an input, you want the targets that are |
| // associated with it. We don't want to just append this to the |
| // target_matches, however, since these targets should actually be listed in |
| // the output, while for normal targets you don't want to see the inputs, |
| // only what refers to them. |
| std::vector<const Target*> all_targets = |
| setup->builder().GetAllResolvedTargets(); |
| UniqueVector<const Target*> explicit_target_matches; |
| for (const auto& file : file_matches) { |
| std::vector<TargetContainingFile> target_containing; |
| GetTargetsContainingFile(setup, all_targets, file, default_toolchain_only, |
| &target_containing); |
| |
| // Extract just the Target*. |
| for (const TargetContainingFile& pair : target_containing) |
| explicit_target_matches.push_back(pair.first); |
| } |
| for (auto* config : config_matches) { |
| GetTargetsReferencingConfig(setup, all_targets, config, |
| default_toolchain_only, |
| &explicit_target_matches); |
| } |
| |
| // Tell the user if their input matches no files or labels. We need to check |
| // both that it matched no targets and no configs. File input will already |
| // have been converted to targets at this point. Configs will have been |
| // converted to targets also, but there could be no targets referencing the |
| // config, which is different than no config with that name. |
| bool quiet = cmdline->HasSwitch("q"); |
| if (!quiet && config_matches.empty() && explicit_target_matches.empty() && |
| target_matches.empty()) { |
| OutputString("The input matches no targets, configs, or files.\n", |
| DECORATION_YELLOW); |
| return 1; |
| } |
| |
| // Construct the reverse dependency tree. |
| DepMap dep_map; |
| FillDepMap(setup, &dep_map); |
| |
| size_t cnt = 0; |
| if (tree) |
| cnt = DoTreeOutput(dep_map, target_matches, explicit_target_matches, all); |
| else if (all) |
| cnt = DoAllListOutput(dep_map, target_matches, explicit_target_matches); |
| else |
| cnt = DoDirectListOutput(dep_map, target_matches, explicit_target_matches); |
| |
| // If you ask for the references of a valid target, but that target has |
| // nothing referencing it, we'll get here without having printed anything. |
| if (!quiet && cnt == 0) |
| OutputString("Nothing references this.\n", DECORATION_YELLOW); |
| |
| return 0; |
| } |
| |
| } // namespace commands |
