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// Copyright 2015 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 EVAL_H_
#define EVAL_H_
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "loc.h"
#include "stmt.h"
#include "string_piece.h"
#include "symtab.h"
using namespace std;
class Makefile;
class Rule;
class Var;
class Vars;
class Evaluator {
public:
Evaluator();
~Evaluator();
void EvalAssign(const AssignStmt* stmt);
void EvalRule(const RuleStmt* stmt);
void EvalCommand(const CommandStmt* stmt);
void EvalIf(const IfStmt* stmt);
void EvalInclude(const IncludeStmt* stmt);
void EvalExport(const ExportStmt* stmt);
Var* LookupVar(Symbol name);
// For target specific variables.
Var* LookupVarInCurrentScope(Symbol name);
string EvalVar(Symbol name);
const Loc& loc() const { return loc_; }
void set_loc(const Loc& loc) { loc_ = loc; }
const vector<const Rule*>& rules() const { return rules_; }
const unordered_map<Symbol, Vars*>& rule_vars() const {
return rule_vars_;
}
const unordered_map<Symbol, bool>& exports() const { return exports_; }
void Error(const string& msg);
void set_is_bootstrap(bool b) { is_bootstrap_ = b; }
void set_current_scope(Vars* v) { current_scope_ = v; }
bool avoid_io() const { return avoid_io_; }
void set_avoid_io(bool a) { avoid_io_ = a; }
const vector<string>& delayed_output_commands() const {
return delayed_output_commands_;
}
void add_delayed_output_command(const string& c) {
delayed_output_commands_.push_back(c);
}
void clear_delayed_output_commands() {
delayed_output_commands_.clear();
}
static const unordered_set<Symbol>& used_undefined_vars() {
return used_undefined_vars_;
}
int eval_depth() const { return eval_depth_; }
void IncrementEvalDepth() {
eval_depth_++;
}
void DecrementEvalDepth() {
eval_depth_--;
}
private:
Var* EvalRHS(Symbol lhs, Value* rhs, StringPiece orig_rhs, AssignOp op,
bool is_override = false);
void DoInclude(const string& fname);
Var* LookupVarGlobal(Symbol name);
unordered_map<Symbol, Vars*> rule_vars_;
vector<const Rule*> rules_;
unordered_map<Symbol, bool> exports_;
Rule* last_rule_;
Vars* current_scope_;
Loc loc_;
bool is_bootstrap_;
bool avoid_io_;
// This value tracks the nest level of make expressions. For
// example, $(YYY) in $(XXX $(YYY)) is evaluated with depth==2.
// This will be used to disallow $(shell) in other make constructs.
int eval_depth_;
// Commands which should run at ninja-time (i.e., info, warning, and
// error).
vector<string> delayed_output_commands_;
static unordered_set<Symbol> used_undefined_vars_;
};
#endif // EVAL_H_
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