74dfdd02de
Recursive functions that may go very deep should invoke the function check_stack. It throws an exception if the amount of stack space is limited.
The function check_system() is syntax sugar for
check_interrupted();
check_stack();
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/*
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Copyright (c) 2013 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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#include "util/lua.h"
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#include <exception>
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#include <string>
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namespace lean {
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class sstream;
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/** \brief Base class for all Lean exceptions */
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class exception : public std::exception {
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protected:
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std::string m_msg;
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exception() {}
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public:
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exception(char const * msg);
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exception(std::string const & msg);
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exception(sstream const & strm);
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virtual ~exception() noexcept;
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virtual char const * what() const noexcept;
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virtual exception * clone() const { return new exception(m_msg); }
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virtual void rethrow() const { throw *this; }
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};
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/** \brief Exception produced by a Lean parser. */
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class parser_exception : public exception {
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protected:
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unsigned m_line;
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unsigned m_pos;
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public:
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parser_exception(char const * msg, unsigned l, unsigned p);
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parser_exception(std::string const & msg, unsigned l, unsigned p);
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parser_exception(sstream const & strm, unsigned l, unsigned p);
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virtual ~parser_exception() noexcept;
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virtual char const * what() const noexcept;
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unsigned get_line() const { return m_line; }
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unsigned get_pos() const { return m_pos; }
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virtual exception * clone() const { return new parser_exception(m_msg, m_line, m_pos); }
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virtual void rethrow() const { throw *this; }
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};
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/** \brief Exception used to sign that a computation was interrupted */
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class interrupted : public exception {
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public:
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interrupted() {}
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virtual ~interrupted() noexcept {}
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virtual char const * what() const noexcept { return "interrupted"; }
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virtual exception * clone() const { return new interrupted(); }
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virtual void rethrow() const { throw *this; }
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};
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class stack_space_exception : public exception {
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public:
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stack_space_exception() {}
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virtual char const * what() const noexcept { return "deep recursion was detected (potential solution: increase stack space in your system)"; }
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virtual exception * clone() const { return new stack_space_exception(); }
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virtual void rethrow() const { throw *this; }
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};
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int push_exception(lua_State * L, exception const & e);
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exception const & to_exception(lua_State * L, int i);
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bool is_exception(lua_State * L, int i);
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void open_exception(lua_State * L);
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}
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