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149 lines
5.8 KiB
C++
149 lines
5.8 KiB
C++
// Copyright (c) 2013 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_BUILDER_H_
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#define TOOLS_GN_BUILDER_H_
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#include <map>
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#include <memory>
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#include "base/callback.h"
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#include "base/macros.h"
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#include "tools/gn/builder_record.h"
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#include "tools/gn/label.h"
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#include "tools/gn/label_ptr.h"
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#include "tools/gn/unique_vector.h"
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class ActionValues;
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class Err;
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class Loader;
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class ParseNode;
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// The builder assembles the dependency tree. It is not threadsafe and runs on
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// the main thread only. See also BuilderRecord.
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class Builder {
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public:
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typedef base::Callback<void(const BuilderRecord*)> ResolvedGeneratedCallback;
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explicit Builder(Loader* loader);
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~Builder();
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// The resolved callback is called when a target has been both resolved and
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// marked generated. This will be executed only on the main thread.
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void set_resolved_and_generated_callback(
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const ResolvedGeneratedCallback& cb) {
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resolved_and_generated_callback_ = cb;
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}
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Loader* loader() const { return loader_; }
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void ItemDefined(std::unique_ptr<Item> item);
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// Returns NULL if there is not a thing with the corresponding label.
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const Item* GetItem(const Label& label) const;
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const Toolchain* GetToolchain(const Label& label) const;
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std::vector<const BuilderRecord*> GetAllRecords() const;
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// Returns items which should be generated and which are defined.
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std::vector<const Item*> GetAllResolvedItems() const;
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// Returns targets which should be generated and which are defined.
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std::vector<const Target*> GetAllResolvedTargets() const;
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// Returns the record for the given label, or NULL if it doesn't exist.
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// Mostly used for unit tests.
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const BuilderRecord* GetRecord(const Label& label) const;
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BuilderRecord* GetRecord(const Label& label);
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// If there are any undefined references, returns false and sets the error.
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bool CheckForBadItems(Err* err) const;
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private:
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bool TargetDefined(BuilderRecord* record, Err* err);
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bool ConfigDefined(BuilderRecord* record, Err* err);
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bool ToolchainDefined(BuilderRecord* record, Err* err);
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// Returns the record associated with the given label. This function checks
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// that if we already have references for it, the type matches. If no record
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// exists yet, a new one will be created.
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//
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// If any of the conditions fail, the return value will be null and the error
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// will be set. request_from is used as the source of the error.
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BuilderRecord* GetOrCreateRecordOfType(const Label& label,
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const ParseNode* request_from,
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BuilderRecord::ItemType type,
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Err* err);
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// Returns the record associated with the given label. This function checks
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// that it's already been resolved to the correct type.
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//
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// If any of the conditions fail, the return value will be null and the error
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// will be set. request_from is used as the source of the error.
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BuilderRecord* GetResolvedRecordOfType(const Label& label,
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const ParseNode* request_from,
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BuilderRecord::ItemType type,
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Err* err);
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bool AddDeps(BuilderRecord* record,
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const LabelConfigVector& configs,
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Err* err);
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bool AddDeps(BuilderRecord* record,
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const UniqueVector<LabelConfigPair>& configs,
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Err* err);
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bool AddDeps(BuilderRecord* record,
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const LabelTargetVector& targets,
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Err* err);
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bool AddActionValuesDep(BuilderRecord* record,
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const ActionValues& action_values,
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Err* err);
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bool AddToolchainDep(BuilderRecord* record,
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const Target* target,
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Err* err);
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// Given a target, sets the "should generate" bit and pushes it through the
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// dependency tree. Any time the bit it set, we ensure that the given item is
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// scheduled to be loaded.
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//
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// If the force flag is set, we'll ignore the current state of the record's
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// should_generate flag, and set it on the dependents every time. This is
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// used when defining a target: the "should generate" may have been set
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// before the item was defined (if it is required by something that is
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// required). In this case, we need to re-push the "should generate" flag
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// to the item's dependencies.
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void RecursiveSetShouldGenerate(BuilderRecord* record, bool force);
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void ScheduleItemLoadIfNecessary(BuilderRecord* record);
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// This takes a BuilderRecord with resolved depdencies, and fills in the
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// target's Label*Vectors with the resolved pointers.
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bool ResolveItem(BuilderRecord* record, Err* err);
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// Fills in the pointers in the given vector based on the labels. We assume
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// that everything should be resolved by this point, so will return an error
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// if anything isn't found or if the type doesn't match.
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bool ResolveDeps(LabelTargetVector* deps, Err* err);
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bool ResolveConfigs(UniqueVector<LabelConfigPair>* configs, Err* err);
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bool ResolveActionValues(ActionValues* action_values, Err* err);
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bool ResolveToolchain(Target* target, Err* err);
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bool ResolvePools(Toolchain* toolchain, Err* err);
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// Given a list of unresolved records, tries to find any circular
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// dependencies and returns the string describing the problem. If no circular
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// deps were found, returns the empty string.
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std::string CheckForCircularDependencies(
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const std::vector<const BuilderRecord*>& bad_records) const;
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// Non owning pointer.
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Loader* loader_;
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std::map<Label, std::unique_ptr<BuilderRecord>> records_;
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ResolvedGeneratedCallback resolved_and_generated_callback_;
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DISALLOW_COPY_AND_ASSIGN(Builder);
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};
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#endif // TOOLS_GN_BUILDER_H_
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