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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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef EVAL_H_
#define EVAL_H_
#include <memory>
#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 {
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);
// Equivalent to LookupVar, but doesn't mark as used.
Var* PeekVar(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_is_commandline(bool c) { is_commandline_ = c; }
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) {
void clear_delayed_output_commands() { delayed_output_commands_.clear(); }
static const SymbolSet& used_undefined_vars() { return used_undefined_vars_; }
int eval_depth() const { return eval_depth_; }
void IncrementEvalDepth() { eval_depth_++; }
void DecrementEvalDepth() { eval_depth_--; }
string GetShell();
string GetShellFlag();
string GetShellAndFlag();
void CheckStack() {
void* addr = __builtin_frame_address(0);
if (__builtin_expect(addr < lowest_stack_ && addr >= stack_addr_, 0)) {
lowest_stack_ = addr;
lowest_loc_ = loc_;
void DumpStackStats() const;
bool ExportDeprecated() const { return export_message_ && !export_error_; };
bool ExportObsolete() const { return export_error_; };
void SetExportDeprecated(StringPiece msg) {
export_message_.reset(new string(msg.as_string()));
void SetExportObsolete(StringPiece msg) {
export_message_.reset(new string(msg.as_string()));
export_error_ = true;
void ProfileMakefile(StringPiece mk) {
Var* EvalRHS(Symbol lhs,
Value* rhs,
StringPiece orig_rhs,
AssignOp op,
bool is_override,
bool* needs_assign);
void DoInclude(const string& fname);
Var* LookupVarGlobal(Symbol name);
// Equivalent to LookupVarInCurrentScope, but doesn't mark as used.
Var* PeekVarInCurrentScope(Symbol name);
void MarkVarsReadonly(Value* var_list);
void EvalRuleSpecificAssign(const vector<Symbol>& targets,
const RuleStmt* stmt,
const StringPiece& lhs_string,
size_t separator_pos);
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 is_commandline_;
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_;
Symbol posix_sym_;
bool is_posix_;
void* stack_addr_;
size_t stack_size_;
void* lowest_stack_;
Loc lowest_loc_;
unique_ptr<string> export_message_;
bool export_error_;
vector<string> profiled_files_;
static SymbolSet used_undefined_vars_;
#endif // EVAL_H_