1/*=============================================================================
2 Copyright (c) 2001-2014 Joel de Guzman
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6=============================================================================*/
7#if !defined(BOOST_SPIRIT_X3_CALC9_COMPILER_HPP)
8#define BOOST_SPIRIT_X3_CALC9_COMPILER_HPP
9
10#include "ast.hpp"
11#include "error_handler.hpp"
12#include <vector>
13#include <map>
14
15namespace client { namespace code_gen
16{
17 ///////////////////////////////////////////////////////////////////////////
18 // The Program
19 ///////////////////////////////////////////////////////////////////////////
20 struct program
21 {
22 void op(int a);
23 void op(int a, int b);
24 void op(int a, int b, int c);
25
26 int& operator[](std::size_t i) { return code[i]; }
27 int operator[](std::size_t i) const { return code[i]; }
28 void clear() { code.clear(); variables.clear(); }
29 std::size_t size() const { return code.size(); }
30 std::vector<int> const& operator()() const { return code; }
31
32 std::size_t nvars() const { return variables.size(); }
33 int const* find_var(std::string const& name) const;
34 void add_var(std::string const& name);
35
36 void print_variables(std::vector<int> const& stack) const;
37 void print_assembler() const;
38
39 private:
40
41 std::map<std::string, int> variables;
42 std::vector<int> code;
43 };
44
45 ////////////////////////////////////////////////////////////////////////////
46 // The Compiler
47 ////////////////////////////////////////////////////////////////////////////
48 struct compiler
49 {
50 typedef bool result_type;
51 typedef std::function<
52 void(x3::position_tagged, std::string const&)>
53 error_handler_type;
54
55 template <typename ErrorHandler>
56 compiler(
57 client::code_gen::program& program
58 , ErrorHandler const& error_handler)
59 : program(program)
60 , error_handler(
61 [&](x3::position_tagged pos, std::string const& msg)
62 { error_handler(pos, msg); }
63 )
64 {}
65
66 bool operator()(ast::nil) const { BOOST_ASSERT(0); return false; }
67 bool operator()(unsigned int x) const;
68 bool operator()(bool x) const;
69 bool operator()(ast::variable const& x) const;
70 bool operator()(ast::operation const& x) const;
71 bool operator()(ast::unary const& x) const;
72 bool operator()(ast::expression const& x) const;
73 bool operator()(ast::assignment const& x) const;
74 bool operator()(ast::variable_declaration const& x) const;
75 bool operator()(ast::statement_list const& x) const;
76 bool operator()(ast::statement const& x) const;
77 bool operator()(ast::if_statement const& x) const;
78 bool operator()(ast::while_statement const& x) const;
79
80 bool start(ast::statement_list const& x) const;
81
82 client::code_gen::program& program;
83 error_handler_type error_handler;
84 };
85}}
86
87#endif
88

source code of boost/libs/spirit/example/x3/calc/calc9/compiler.hpp