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// -*- C++ -*-
// Copyright (C) 2005 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
#ifndef PARSE_H
#define PARSE_H
#include <string>
#include <fstream>
#include <iostream>
#include <vector>
#include <stdexcept>
struct source_loc
{
std::string file;
unsigned line;
unsigned column;
};
enum token_type
{
tok_junk, tok_identifier, tok_operator, tok_string, tok_number,
tok_embedded
// XXX: add tok_keyword throughout
};
struct token
{
source_loc location;
token_type type;
std::string content;
};
std::ostream& operator << (std::ostream& o, const token& t);
struct parse_error: public std::runtime_error
{
const token* tok;
parse_error (const std::string& msg): runtime_error (msg), tok (0) {}
parse_error (const std::string& msg, const token* t): runtime_error (msg),
tok (t) {}
};
class lexer
{
public:
token* scan ();
lexer (std::istream&, const std::string&);
private:
int input_get ();
int input_peek (unsigned n=0);
std::istream& input;
std::string input_name;
std::vector<int> lookahead;
unsigned cursor_line;
unsigned cursor_column;
};
class parser
{
public:
parser (systemtap_session& s, std::istream& i, bool p);
parser (systemtap_session& s, const std::string& n, bool p);
~parser ();
stapfile* parse ();
static stapfile* parse (systemtap_session& s, std::istream& i, bool privileged);
static stapfile* parse (systemtap_session& s, const std::string& n, bool privileged);
private:
systemtap_session& session;
std::string input_name;
std::istream* free_input;
lexer input;
bool privileged;
// preprocessing subordinate
std::vector<const token*> enqueued_pp;
const token* scan_pp ();
// scanning state
const token* last ();
const token* next ();
const token* peek ();
const token* last_t; // the last value returned by peek() or next()
const token* next_t; // lookahead token
// expectations
const token* expect_known (token_type tt, std::string const & expected);
const token* expect_unknown (token_type tt, std::string & target);
// convenience forms
const token* expect_op (std::string const & expected);
const token* expect_kw (std::string const & expected);
const token* expect_number (int64_t & expected);
const token* expect_ident (std::string & target);
bool peek_op (std::string const & op);
bool peek_kw (std::string const & kw);
void print_error (const parse_error& pe);
unsigned num_errors;
private: // nonterminals
void parse_probe (std::vector<probe*>&, std::vector<probe_alias*>&);
void parse_global (std::vector<vardecl*>&,
std::map<std::string, statistic_decl> &stat_decls);
void parse_functiondecl (std::vector<functiondecl*>&);
embeddedcode* parse_embeddedcode ();
probe_point* parse_probe_point ();
literal* parse_literal ();
block* parse_stmt_block ();
statement* parse_statement ();
if_statement* parse_if_statement ();
for_loop* parse_for_loop ();
for_loop* parse_while_loop ();
foreach_loop* parse_foreach_loop ();
expr_statement* parse_expr_statement ();
return_statement* parse_return_statement ();
delete_statement* parse_delete_statement ();
next_statement* parse_next_statement ();
break_statement* parse_break_statement ();
continue_statement* parse_continue_statement ();
indexable* parse_indexable ();
const token *parse_hist_op_or_bare_name (hist_op *&hop, std::string &name);
expression* parse_expression ();
expression* parse_assignment ();
expression* parse_ternary ();
expression* parse_logical_or ();
expression* parse_logical_and ();
expression* parse_boolean_or ();
expression* parse_boolean_xor ();
expression* parse_boolean_and ();
expression* parse_array_in ();
expression* parse_comparison ();
expression* parse_shift ();
expression* parse_concatenation ();
expression* parse_additive ();
expression* parse_multiplicative ();
expression* parse_unary ();
expression* parse_crement ();
expression* parse_value ();
expression* parse_symbol ();
};
#endif // PARSE_H
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