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// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef NINJA_STATE_H_
#define NINJA_STATE_H_
#include <map>
#include <set>
#include <string>
#include <vector>
using namespace std;
#include "eval_env.h"
#include "hash_map.h"
struct Edge;
struct Node;
struct Rule;
/// A pool for delayed edges.
/// Pools are scoped to a State. Edges within a State will share Pools. A Pool
/// will keep a count of the total 'weight' of the currently scheduled edges. If
/// a Plan attempts to schedule an Edge which would cause the total weight to
/// exceed the depth of the Pool, the Pool will enque the Edge instead of
/// allowing the Plan to schedule it. The Pool will relinquish queued Edges when
/// the total scheduled weight diminishes enough (i.e. when a scheduled edge
/// completes).
struct Pool {
explicit Pool(const string& name, int depth)
: name_(name), current_use_(0), depth_(depth), delayed_(&WeightedEdgeCmp) { }
// A depth of 0 is infinite
bool is_valid() const { return depth_ >= 0; }
int depth() const { return depth_; }
const string& name() const { return name_; }
/// true if the Pool might delay this edge
bool ShouldDelayEdge() const { return depth_ != 0; }
/// informs this Pool that the given edge is committed to be run.
/// Pool will count this edge as using resources from this pool.
void EdgeScheduled(const Edge& edge);
/// informs this Pool that the given edge is no longer runnable, and should
/// relinquish its resources back to the pool
void EdgeFinished(const Edge& edge);
/// adds the given edge to this Pool to be delayed.
void DelayEdge(Edge* edge);
/// Pool will add zero or more edges to the ready_queue
void RetrieveReadyEdges(set<Edge*>* ready_queue);
/// Dump the Pool and its edges (useful for debugging).
void Dump() const;
private:
string name_;
/// |current_use_| is the total of the weights of the edges which are
/// currently scheduled in the Plan (i.e. the edges in Plan::ready_).
int current_use_;
int depth_;
static bool WeightedEdgeCmp(const Edge* a, const Edge* b);
typedef set<Edge*,bool(*)(const Edge*, const Edge*)> DelayedEdges;
DelayedEdges delayed_;
};
/// Global state (file status, loaded rules) for a single run.
struct State {
static Pool kDefaultPool;
static const Rule kPhonyRule;
State();
void AddRule(const Rule* rule);
const Rule* LookupRule(const string& rule_name);
void AddPool(Pool* pool);
Pool* LookupPool(const string& pool_name);
Edge* AddEdge(const Rule* rule);
Node* GetNode(StringPiece path);
Node* LookupNode(StringPiece path) const;
Node* SpellcheckNode(const string& path);
void AddIn(Edge* edge, StringPiece path);
void AddOut(Edge* edge, StringPiece path);
bool AddDefault(StringPiece path, string* error);
/// Reset state. Keeps all nodes and edges, but restores them to the
/// state where we haven't yet examined the disk for dirty state.
void Reset();
/// Dump the nodes and Pools (useful for debugging).
void Dump();
/// @return the root node(s) of the graph. (Root nodes have no output edges).
/// @param error where to write the error message if somethings went wrong.
vector<Node*> RootNodes(string* error);
vector<Node*> DefaultNodes(string* error);
/// Mapping of path -> Node.
typedef ExternalStringHashMap<Node*>::Type Paths;
Paths paths_;
/// All the rules used in the graph.
map<string, const Rule*> rules_;
/// All the pools used in the graph.
map<string, Pool*> pools_;
/// All the edges of the graph.
vector<Edge*> edges_;
BindingEnv bindings_;
vector<Node*> defaults_;
};
#endif // NINJA_STATE_H_
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