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/* |
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cpjit.C -- c portable jit in time compiler |
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Copyright (C) 2005 Marc Lehmann <cpjit@schmorp.de> |
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|
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This file is part of libcpjit. |
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|
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libcpjit is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with gvpe; if not, write to the Free Software |
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Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include "config.h" |
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|
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#include "cpjit.h" |
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|
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#include <cassert> |
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#include <cstdlib> |
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#include <cstdarg> |
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#include <cstdio> |
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#include <cstring> |
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#include <cerrno> |
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|
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#include <iostream> |
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#include <sstream> |
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#include <fstream> |
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#include <stdexcept> |
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#include <iomanip> |
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|
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#include <unistd.h> |
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#include <fcntl.h> // for locking |
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|
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#include <sys/stat.h> |
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#include <sys/types.h> |
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#include <dirent.h> |
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#include <utime.h> |
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|
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#include "md5.h" |
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|
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#include <dlfcn.h> |
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|
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#define STR_(str) #str |
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#define STR(str) STR_(str) |
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|
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#define IDX_VERSION 1 |
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|
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namespace cpjit |
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{ |
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|
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using namespace std; |
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|
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const char typestr<U8 >::str[] = "unsigned " STR(TYPE_INT8); |
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const char typestr<U16 >::str[] = "unsigned " STR(TYPE_INT16); |
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const char typestr<U32 >::str[] = "unsigned " STR(TYPE_INT32); |
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const char typestr<U64 >::str[] = "unsigned " STR(TYPE_INT64); |
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const char typestr<I8 >::str[] = "signed " STR(TYPE_INT8); |
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const char typestr<I16 >::str[] = STR(TYPE_INT16); |
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const char typestr<I32 >::str[] = STR(TYPE_INT32); |
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const char typestr<I64 >::str[] = STR(TYPE_INT64); |
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const char typestr<FLT >::str[] = "float"; |
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const char typestr<DBL >::str[] = "double"; |
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|
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const char typestr<PTR >::str[] = "void" " *"; |
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|
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const char typestr<U8 *>::str[] = "unsigned " STR(TYPE_INT8) " *"; |
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const char typestr<U16 *>::str[] = "unsigned " STR(TYPE_INT16) " *"; |
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const char typestr<U32 *>::str[] = "unsigned " STR(TYPE_INT32) " *"; |
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const char typestr<U64 *>::str[] = "unsigned " STR(TYPE_INT64) " *"; |
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const char typestr<I8 *>::str[] = "signed " STR(TYPE_INT8) " *"; |
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const char typestr<I16 *>::str[] = STR(TYPE_INT16) " *"; |
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const char typestr<I32 *>::str[] = STR(TYPE_INT32) " *"; |
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const char typestr<I64 *>::str[] = STR(TYPE_INT64) " *"; |
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const char typestr<FLT *>::str[] = "float" " *"; |
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const char typestr<DBL *>::str[] = "double" " *"; |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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struct digest : md5_ctx |
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{ |
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digest () |
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{ |
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md5_init_ctx (this); |
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} |
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|
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digest &operator <<(const string &data) |
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{ |
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md5_process_bytes (data.c_str (), data.size (), this); |
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return *this; |
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} |
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|
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operator string(); |
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}; |
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|
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digest::operator string () |
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{ |
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unsigned char data[16]; |
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std::ostringstream s; |
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|
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md5_finish_ctx (this, data); |
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|
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for (int i = 0; i < 16; i++) |
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s << std::setfill ('0') << std::hex << std::setw (2) << (int)data [i]; |
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|
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return s.str (); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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static inline bool |
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is_null (const string &s) |
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{ |
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return s.empty (); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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// error exception builder |
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struct error : std::ostringstream |
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{ |
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~error () |
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{ |
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throw std::runtime_error (str ()); |
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} |
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}; |
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|
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#define FATAL(msg) do { error o; o << msg << std::endl; } while (0) |
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#define ERRNO " (" << strerror (errno) << ")" |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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static long get_stamp (int fd) |
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{ |
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struct stat st; |
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|
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if (fstat (fd, &st)) |
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FATAL ("could not get file stamp"); |
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|
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return (long)st.st_mtime; |
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} |
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|
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static void set_stamp (const string &path, long stamp) |
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{ |
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struct utimbuf ut; |
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|
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ut.actime = stamp; |
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ut.modtime = stamp; |
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|
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if (utime (path.c_str (), &ut)) |
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FATAL ("could not set file stamp"); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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funsrc::funsrc () |
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{ |
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} |
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|
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void funsrc::update_id (const char *pfx) |
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{ |
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digest dgst; |
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|
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for (set<string>::const_iterator i = hdrlist.begin (); |
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i != hdrlist.end (); |
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++i) |
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dgst << *i; |
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|
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dgst << retlist << arglist << body; |
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|
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id = pfx + (string) dgst; |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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funbuild::funbuild (env &e, const char *rettype, ...) |
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: e(e) |
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{ |
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retlist = rettype; |
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|
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std::ostringstream argl; |
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|
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va_list ap; |
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va_start (ap, rettype); |
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|
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int args = 0; |
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while ((rettype = va_arg (ap, const char *))) |
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{ |
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if (args++) |
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argl << ", "; |
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|
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argl << rettype << " a" << args; |
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} |
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|
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va_end (ap); |
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|
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arglist = argl.str (); |
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} |
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|
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void funbuild::header (const std::string &hdr) |
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{ |
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hdrlist.insert (hdr); |
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} |
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|
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funbuild &funbuild::operator <<(const char *src) |
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{ |
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bodystream << src; |
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} |
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|
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funbuild &funbuild::operator <<(const string &src) |
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{ |
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bodystream << src; |
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} |
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|
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fun *funbuild::get () |
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{ |
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body = bodystream.str (); |
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update_id ("f_"); |
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e.register_fragment (*this); |
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|
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return new fun (e, id); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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fun::fun (env &e, const funid &id) |
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: e(e), id(id), funptr(0) |
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{ |
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} |
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|
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void *fun::ptr () |
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{ |
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if (!funptr) |
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funptr = e.sym (id, id.c_str ()); |
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|
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return funptr; |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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env::env (const string &path, bool temporary) |
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: path(path), temporary(temporary) |
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{ |
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bool create; |
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mode_t oflags = O_RDWR | O_EXCL; |
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|
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if (is_null (path)) |
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{ |
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temporary = true; |
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this->path = tmpnam (0); |
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} |
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|
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create = mkdir (this->path.c_str (), 0777) == 0; |
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|
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if (!create && temporary) |
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FATAL ("error while creating libcpjit temporary directory" << ERRNO); |
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|
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idxpath = this->path + "/libcpjit.idx"; |
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idxfd = open (idxpath.c_str (), O_RDWR | (create ? O_CREAT | O_EXCL : 0), 0666); |
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if (idxfd < 0) |
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FATAL (path << ": unable to open index file " << idxpath); |
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|
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lock (); |
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|
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if (create) |
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{ |
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idxstamp = get_stamp (idxfd) - 1; |
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nextid = 0; |
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save_index (); |
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} |
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|
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load_index (); |
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unlock (); |
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compact (); |
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} |
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|
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env::~env () |
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{ |
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if (temporary) |
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clear (); |
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} |
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|
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void env::clear () |
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{ |
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DIR *dir = opendir (path.c_str ()); |
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|
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if (dir) |
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{ |
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struct dirent *de; |
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while ((de = readdir (dir))) |
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{ |
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if (de->d_name [0] == '.') |
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continue; |
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|
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string f = path + "/" + de->d_name; |
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unlink (f.c_str ()); |
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} |
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|
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closedir (dir); |
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} |
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|
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if (rmdir (path.c_str ())) |
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FATAL (path << ": unable to remove libcpjit directory" << ERRNO); |
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} |
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|
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void env::dolock (bool lock) |
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{ |
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struct flock fl; |
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|
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fl.l_type = lock ? F_WRLCK : F_UNLCK; |
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fl.l_whence = SEEK_SET; |
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fl.l_start = 0; |
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fl.l_len = 0; |
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|
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while (fcntl (idxfd, F_SETLKW, &fl) < 0) |
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if (errno != EINTR) |
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FATAL (path << ": unable to lock index file" << ERRNO); |
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} |
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|
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void env::lock () |
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{ |
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dolock (true); |
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} |
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|
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void env::unlock () |
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{ |
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dolock (false); |
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} |
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|
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bool |
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env::load_index () |
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{ |
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// caller must lock() |
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|
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long stamp = get_stamp (idxfd); |
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|
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if (stamp == idxstamp) |
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return false; |
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|
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idxstamp = stamp; |
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|
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fstream f (idxpath.c_str (), ios::in); |
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|
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if (!f) |
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FATAL (idxpath << ": unable to read index" << ERRNO); |
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|
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f >> nextid; |
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|
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if (nextid != IDX_VERSION) |
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FATAL (idxpath << ": index file corrupted"); |
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|
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f >> nextid; |
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|
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id2file.clear (); |
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|
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while (f) |
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{ |
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string id; f >> id; |
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|
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if (id == "-") |
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break; |
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|
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string fileid; f >> fileid; |
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|
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id2file [id] = fileid; |
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|
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} |
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|
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string end; f >> end; |
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|
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if (end != "__end__" || !f) |
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FATAL (idxpath << ": index file corrupted"); |
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|
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f.close (); |
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|
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return true; |
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} |
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|
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void |
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env::save_index () |
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{ |
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// caller must lock()+load_index() |
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|
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std::fstream f (idxpath.c_str ()); |
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|
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if (!f) |
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FATAL (idxpath << ": unable to write index" << ERRNO); |
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|
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f << IDX_VERSION << "\n" |
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<< nextid << "\n"; |
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|
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for (map<string, string>::const_iterator i = id2file.begin (); |
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i != id2file.end (); |
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++i) |
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f << (*i).first << " " << (*i).second << "\n"; |
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|
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f << "-\n"; |
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f << "__end__\n"; |
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|
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f.close (); |
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|
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set_stamp (idxpath, ++idxstamp); |
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} |
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|
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void |
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env::compact () |
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{ |
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lock (); |
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save_index (); |
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unlock (); |
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} |
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|
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void env::register_fragment (const funsrc &fragment) |
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{ |
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fragments.push_back (fragment); |
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} |
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|
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void *env::dlsym (const string &id, const char *symbol) |
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{ |
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assert (id2file.find (id) != id2file.end ()); |
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|
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const string &fileid = id2file [id]; |
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|
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void *so; |
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|
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// load so |
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if (file2so.find (fileid) == file2so.end ()) |
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{ |
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string sopath = path + "/" + fileid + ".so"; |
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|
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so = dlopen (sopath.c_str (), RTLD_LAZY | RTLD_GLOBAL); |
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if (!so) |
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FATAL (sopath << ": so file should be there but isn't" << ERRNO); |
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} |
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else |
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so = file2so [fileid]; |
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|
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return ::dlsym (so, symbol); |
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} |
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|
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void *env::sym (const string &id, const char *symbol) |
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{ |
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// not yet compiled? |
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if (id2file.find (id) == id2file.end ()) |
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{ |
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lock (); |
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|
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// nobody else compiled it? |
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if (!load_index () || id2file.find (id) == id2file.end ()) |
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{ |
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ostringstream sfile; |
| 459 |
sfile << nextid++; |
| 460 |
string fileid = sfile.str (); |
| 461 |
string base = path + "/" + fileid; |
| 462 |
|
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string fc = base + ".c"; |
| 464 |
string fo = base + ".o"; |
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string fso = base + ".so"; |
| 466 |
|
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std::ofstream f (fc.c_str ()); |
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set<string> hdrs; |
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|
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for (vector<funsrc>::const_iterator i = fragments.begin (); |
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i != fragments.end (); |
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++i) |
| 473 |
if (id2file.find (i->id) == id2file.end ()) |
| 474 |
{ |
| 475 |
f << "#line 1 \"" << i->id << "-hdrlist\"\n"; |
| 476 |
|
| 477 |
for (set<string>::const_iterator j = i->hdrlist.begin (); |
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j != i->hdrlist.end (); |
| 479 |
++j) |
| 480 |
f << *j << "\n"; |
| 481 |
|
| 482 |
f << "#line 1 \"" << i->id << "-body\"\n" |
| 483 |
<< i->retlist << " " << i->id << " (" << i->arglist << ")\n" |
| 484 |
<< "{\n" |
| 485 |
<< i->body |
| 486 |
<< "\n}\n"; |
| 487 |
|
| 488 |
id2file [i->id] = fileid; |
| 489 |
} |
| 490 |
|
| 491 |
f.close (); |
| 492 |
fragments.clear (); |
| 493 |
|
| 494 |
system ((CC " " CFLAGS " -o " + fo + " " + fc).c_str ()); |
| 495 |
unlink (fc.c_str ()); |
| 496 |
system ((LD " " LFLAGS " -o " + fso + " " + fo).c_str ()); |
| 497 |
|
| 498 |
save_index (); |
| 499 |
} |
| 500 |
|
| 501 |
unlock (); |
| 502 |
} |
| 503 |
|
| 504 |
void *p = dlsym (id, symbol); |
| 505 |
|
| 506 |
if (!p) |
| 507 |
{ |
| 508 |
lock (); |
| 509 |
load_index (); |
| 510 |
unlock (); |
| 511 |
p = dlsym (id, symbol); |
| 512 |
} |
| 513 |
|
| 514 |
if (!p) |
| 515 |
FATAL ("symbol " << id << ":" << symbol << " not where it should be"); |
| 516 |
|
| 517 |
return p; |
| 518 |
} |
| 519 |
|
| 520 |
} |
