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96 lines
3.5 KiB
C++
96 lines
3.5 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef TOOLS_GN_ANALYZER_H_
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#define TOOLS_GN_ANALYZER_H_
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#include <set>
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#include <string>
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#include <vector>
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#include "tools/gn/builder.h"
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#include "tools/gn/label.h"
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#include "tools/gn/source_file.h"
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#include "tools/gn/target.h"
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// An Analyzer can answer questions about a build graph. It is used
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// to answer queries for the `refs` and `analyze` commands, where we
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// need to look at the graph in ways that can't easily be determined
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// from just a single Target.
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class Analyzer {
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public:
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using LabelSet = std::set<Label>;
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using SourceFileSet = std::set<const SourceFile*>;
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using TargetSet = std::set<const Target*>;
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explicit Analyzer(const Builder& builder);
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~Analyzer();
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// Figures out from a Buider and a JSON-formatted string containing lists
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// of files and targets, which targets would be affected by modifications
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// to the files . See the help text for the analyze command (kAnalyze_Help)
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// for the specification of the input and output string formats and the
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// expected behavior of the method.
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std::string Analyze(const std::string& input, Err* err) const;
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private:
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// Returns the roots of the build graph: the set of targets that
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// no other target depends on.
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TargetSet& roots() { return roots_; };
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// Returns the set of all targets that might be affected, directly or
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// indirectly, by modifications to the given source files.
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TargetSet AllAffectedTargets(const SourceFileSet& source_files) const;
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// Returns the set of labels that do not refer to objects in the graph.
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LabelSet InvalidLabels(const LabelSet& labels) const;
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// Returns the set of all targets that have a label in the given set.
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// Invalid (or missing) labels will be ignored.
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TargetSet TargetsFor(const LabelSet& labels) const;
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// Returns a filtered set of the given targets, meaning that for each of the
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// given targets,
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// - if the target is not a group, add it to the set
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// - if the target is a group, recursively filter each dependency and add
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// its filtered results to the set.
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//
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// For example, if we had:
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//
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// group("foobar") { deps = [ ":foo", ":bar" ] }
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// group("bar") { deps = [ ":baz", ":quux" ] }
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// executable("foo") { ... }
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// executable("baz") { ... }
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// executable("quux") { ... }
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//
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// Then the filtered version of {"foobar"} would be {":foo", ":baz",
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// ":quux"}. This is used by the analyze command in order to only build
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// the affected dependencies of a group (and not also build the unaffected
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// ones).
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//
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// This filtering behavior is also known as "pruning" the list of targets.
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TargetSet Filter(const TargetSet& targets) const;
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// Filter an individual target and adds the results to filtered
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// (see Filter(), above).
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void FilterTarget(const Target*, TargetSet* seen, TargetSet* filtered) const;
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bool TargetRefersToFile(const Target* target, const SourceFile* file) const;
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void AddTargetsDirectlyReferringToFileTo(const SourceFile* file,
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TargetSet* matches) const;
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void AddAllRefsTo(const Target* target, TargetSet* matches) const;
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std::vector<const Target*> all_targets_;
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std::map<const Label, const Target*> labels_to_targets_;
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Label default_toolchain_;
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std::set<const Target*> roots_;
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// Maps targets to the list of targets that depend on them.
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std::multimap<const Target*, const Target*> dep_map_;
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};
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#endif // TOOLS_GN_ANALYZER_H_
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