LCOV - code coverage report
Current view: top level - bridges/source/cpp_uno/shared - vtablefactory.cxx (source / functions) Hit Total Coverage
Test: commit e02a6cb2c3e2b23b203b422e4e0680877f232636 Lines: 4 140 2.9 %
Date: 2014-04-14 Functions: 1 15 6.7 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : 
      21             : #include "bridges/cpp_uno/shared/vtablefactory.hxx"
      22             : 
      23             : #include "guardedarray.hxx"
      24             : 
      25             : #include "bridges/cpp_uno/shared/vtables.hxx"
      26             : 
      27             : #include "osl/thread.h"
      28             : #include "osl/security.hxx"
      29             : #include "osl/file.hxx"
      30             : #include "osl/diagnose.h"
      31             : #include "osl/mutex.hxx"
      32             : #include "rtl/alloc.h"
      33             : #include "rtl/ustring.hxx"
      34             : #include "sal/log.hxx"
      35             : #include "sal/types.h"
      36             : #include "typelib/typedescription.hxx"
      37             : 
      38             : #include <boost/noncopyable.hpp>
      39             : #include <boost/unordered_map.hpp>
      40             : #include <new>
      41             : #include <vector>
      42             : 
      43             : #if defined SAL_UNX
      44             : #include <unistd.h>
      45             : #include <string.h>
      46             : #include <errno.h>
      47             : #include <sys/mman.h>
      48             : #elif defined SAL_W32
      49             : #define WIN32_LEAN_AND_MEAN
      50             : #ifdef _MSC_VER
      51             : #pragma warning(push,1) // disable warnings within system headers
      52             : #endif
      53             : #include <windows.h>
      54             : #ifdef _MSC_VER
      55             : #pragma warning(pop)
      56             : #endif
      57             : #else
      58             : #error Unsupported platform
      59             : #endif
      60             : 
      61             : #if defined USE_DOUBLE_MMAP
      62             : #include <fcntl.h>
      63             : #include <sys/types.h>
      64             : #include <sys/stat.h>
      65             : #endif
      66             : 
      67             : using bridges::cpp_uno::shared::VtableFactory;
      68             : 
      69             : namespace {
      70             : 
      71           0 : extern "C" void * SAL_CALL allocExec(
      72             :     SAL_UNUSED_PARAMETER rtl_arena_type *, sal_Size * size)
      73             : {
      74             :     sal_Size pagesize;
      75             : #if defined SAL_UNX
      76             : #if defined FREEBSD || defined NETBSD || defined OPENBSD || defined DRAGONFLY
      77             :     pagesize = getpagesize();
      78             : #else
      79           0 :     pagesize = sysconf(_SC_PAGESIZE);
      80             : #endif
      81             : #elif defined SAL_W32
      82             :     SYSTEM_INFO info;
      83             :     GetSystemInfo(&info);
      84             :     pagesize = info.dwPageSize;
      85             : #else
      86             : #error Unsupported platform
      87             : #endif
      88           0 :     sal_Size n = (*size + (pagesize - 1)) & ~(pagesize - 1);
      89             :     void * p;
      90             : #if defined SAL_UNX
      91             :     p = mmap(
      92             :         0, n, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1,
      93           0 :         0);
      94           0 :     if (p == MAP_FAILED) {
      95           0 :         p = 0;
      96             :     }
      97           0 :     else if (mprotect (static_cast<char*>(p), n, PROT_READ | PROT_WRITE | PROT_EXEC) == -1)
      98             :     {
      99           0 :         munmap (static_cast<char*>(p), n);
     100           0 :         p = 0;
     101             :     }
     102             : #elif defined SAL_W32
     103             :     p = VirtualAlloc(0, n, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
     104             : #endif
     105           0 :     if (p != 0) {
     106           0 :         *size = n;
     107             :     }
     108           0 :     return p;
     109             : }
     110             : 
     111           0 : extern "C" void SAL_CALL freeExec(
     112             :     SAL_UNUSED_PARAMETER rtl_arena_type *, void * address, sal_Size size)
     113             : {
     114             : #if defined SAL_UNX
     115           0 :     munmap(static_cast< char * >(address), size);
     116             : #elif defined SAL_W32
     117             :     (void) size; // unused
     118             :     VirtualFree(address, 0, MEM_RELEASE);
     119             : #endif
     120           0 : }
     121             : 
     122             : }
     123             : 
     124             : class VtableFactory::GuardedBlocks:
     125             :     public std::vector<Block>, private boost::noncopyable
     126             : {
     127             : public:
     128           0 :     GuardedBlocks(VtableFactory const & factory):
     129           0 :         m_factory(factory), m_guarded(true) {}
     130             : 
     131             :     ~GuardedBlocks();
     132             : 
     133           0 :     void unguard() { m_guarded = false; }
     134             : 
     135             : private:
     136             :     VtableFactory const & m_factory;
     137             :     bool m_guarded;
     138             : };
     139             : 
     140           0 : VtableFactory::GuardedBlocks::~GuardedBlocks() {
     141           0 :     if (m_guarded) {
     142           0 :         for (iterator i(begin()); i != end(); ++i) {
     143           0 :             m_factory.freeBlock(*i);
     144             :         }
     145             :     }
     146           0 : }
     147             : 
     148           0 : class VtableFactory::BaseOffset {
     149             : public:
     150           0 :     BaseOffset(typelib_InterfaceTypeDescription * type) { calculate(type, 0); }
     151             : 
     152           0 :     sal_Int32 getFunctionOffset(OUString const & name) const
     153           0 :     { return m_map.find(name)->second; }
     154             : 
     155             : private:
     156             :     sal_Int32 calculate(
     157             :         typelib_InterfaceTypeDescription * type, sal_Int32 offset);
     158             : 
     159             :     typedef boost::unordered_map< OUString, sal_Int32, OUStringHash > Map;
     160             : 
     161             :     Map m_map;
     162             : };
     163             : 
     164           0 : sal_Int32 VtableFactory::BaseOffset::calculate(
     165             :     typelib_InterfaceTypeDescription * type, sal_Int32 offset)
     166             : {
     167           0 :     OUString name(type->aBase.pTypeName);
     168           0 :     if (m_map.find(name) == m_map.end()) {
     169           0 :         for (sal_Int32 i = 0; i < type->nBaseTypes; ++i) {
     170           0 :             offset = calculate(type->ppBaseTypes[i], offset);
     171             :         }
     172           0 :         m_map.insert(Map::value_type(name, offset));
     173             :         typelib_typedescription_complete(
     174           0 :             reinterpret_cast< typelib_TypeDescription ** >(&type));
     175           0 :         offset += bridges::cpp_uno::shared::getLocalFunctions(type);
     176             :     }
     177           0 :     return offset;
     178             : }
     179             : 
     180           1 : VtableFactory::VtableFactory(): m_arena(
     181             :     rtl_arena_create(
     182             :         "bridges::cpp_uno::shared::VtableFactory",
     183             :         sizeof (void *), // to satisfy alignment requirements
     184           1 :         0, reinterpret_cast< rtl_arena_type * >(-1), allocExec, freeExec, 0))
     185             : {
     186           1 :     if (m_arena == 0) {
     187           0 :         throw std::bad_alloc();
     188             :     }
     189           1 : }
     190             : 
     191           0 : VtableFactory::~VtableFactory() {
     192             :     {
     193           0 :         osl::MutexGuard guard(m_mutex);
     194           0 :         for (Map::iterator i(m_map.begin()); i != m_map.end(); ++i) {
     195           0 :             for (sal_Int32 j = 0; j < i->second.count; ++j) {
     196           0 :                 freeBlock(i->second.blocks[j]);
     197             :             }
     198           0 :             delete[] i->second.blocks;
     199           0 :         }
     200             :     }
     201           0 :     rtl_arena_destroy(m_arena);
     202           0 : }
     203             : 
     204           0 : VtableFactory::Vtables VtableFactory::getVtables(
     205             :     typelib_InterfaceTypeDescription * type)
     206             : {
     207           0 :     OUString name(type->aBase.pTypeName);
     208           0 :     osl::MutexGuard guard(m_mutex);
     209           0 :     Map::iterator i(m_map.find(name));
     210           0 :     if (i == m_map.end()) {
     211           0 :         GuardedBlocks blocks(*this);
     212           0 :         createVtables(blocks, BaseOffset(type), type, true);
     213             :         Vtables vtables;
     214             :         OSL_ASSERT(blocks.size() <= SAL_MAX_INT32);
     215           0 :         vtables.count = static_cast< sal_Int32 >(blocks.size());
     216             :         bridges::cpp_uno::shared::GuardedArray< Block > guardedBlocks(
     217           0 :             new Block[vtables.count]);
     218           0 :         vtables.blocks = guardedBlocks.get();
     219           0 :         for (sal_Int32 j = 0; j < vtables.count; ++j) {
     220           0 :             vtables.blocks[j] = blocks[j];
     221             :         }
     222           0 :         i = m_map.insert(Map::value_type(name, vtables)).first;
     223           0 :         guardedBlocks.release();
     224           0 :         blocks.unguard();
     225             :     }
     226           0 :     return i->second;
     227             : }
     228             : 
     229             : #ifdef USE_DOUBLE_MMAP
     230           0 : bool VtableFactory::createBlock(Block &block, sal_Int32 slotCount) const
     231             : {
     232           0 :     sal_Size size = getBlockSize(slotCount);
     233           0 :     sal_Size pagesize = sysconf(_SC_PAGESIZE);
     234           0 :     block.size = (size + (pagesize - 1)) & ~(pagesize - 1);
     235           0 :     block.start = block.exec = NULL;
     236           0 :     block.fd = -1;
     237             : 
     238           0 :     osl::Security aSecurity;
     239           0 :     OUString strDirectory;
     240           0 :     OUString strURLDirectory;
     241           0 :     if (aSecurity.getHomeDir(strURLDirectory))
     242           0 :         osl::File::getSystemPathFromFileURL(strURLDirectory, strDirectory);
     243             : 
     244           0 :     mode_t nOrigMode = umask(S_IRWXG | S_IRWXO);
     245           0 :     for (int i = strDirectory.isEmpty() ? 1 : 0; i < 2; ++i)
     246             :     {
     247           0 :         if (strDirectory.isEmpty())
     248           0 :             strDirectory = "/tmp";
     249             : 
     250           0 :         strDirectory += "/.execoooXXXXXX";
     251           0 :         OString aTmpName = OUStringToOString(strDirectory, osl_getThreadTextEncoding());
     252           0 :         char *tmpfname = new char[aTmpName.getLength()+1];
     253           0 :         strncpy(tmpfname, aTmpName.getStr(), aTmpName.getLength()+1);
     254           0 :         if ((block.fd = mkstemp(tmpfname)) == -1)
     255           0 :             fprintf(stderr, "mkstemp(\"%s\") failed: %s\n", tmpfname, strerror(errno));
     256           0 :         if (block.fd == -1)
     257             :         {
     258           0 :             delete[] tmpfname;
     259           0 :             break;
     260             :         }
     261           0 :         unlink(tmpfname);
     262           0 :         delete[] tmpfname;
     263             : #if defined(HAVE_POSIX_FALLOCATE)
     264           0 :         int err = posix_fallocate(block.fd, 0, block.size);
     265             : #else
     266             :         int err = ftruncate(block.fd, block.size);
     267             : #endif
     268           0 :         if (err != 0)
     269             :         {
     270             : #if defined(HAVE_POSIX_FALLOCATE)
     271             :             SAL_WARN("bridges", "posix_fallocate failed with code " << err);
     272             : #else
     273             :             SAL_WARN("bridges", "truncation of executable memory area failed with code " << err);
     274             : #endif
     275           0 :             close(block.fd);
     276           0 :             block.fd = -1;
     277           0 :             break;
     278             :         }
     279           0 :         block.start = mmap(NULL, block.size, PROT_READ | PROT_WRITE, MAP_SHARED, block.fd, 0);
     280           0 :         if (block.start== MAP_FAILED) {
     281           0 :             block.start = 0;
     282             :         }
     283           0 :         block.exec = mmap(NULL, block.size, PROT_READ | PROT_EXEC, MAP_SHARED, block.fd, 0);
     284           0 :         if (block.exec == MAP_FAILED) {
     285           0 :            block.exec = 0;
     286             :         }
     287             : 
     288             :         //All good
     289           0 :         if (block.start && block.exec && block.fd != -1)
     290           0 :             break;
     291             : 
     292           0 :         freeBlock(block);
     293             : 
     294           0 :         strDirectory = OUString();
     295           0 :     }
     296           0 :     umask(nOrigMode);
     297           0 :     if (!block.start || !block.exec || block.fd == -1)
     298             :     {
     299             :        //Fall back to non-doublemmaped allocation
     300           0 :        block.fd = -1;
     301           0 :        block.start = block.exec = rtl_arena_alloc(m_arena, &block.size);
     302             :     }
     303           0 :     return (block.start != 0 && block.exec != 0);
     304             : }
     305             : 
     306           0 : void VtableFactory::freeBlock(Block const & block) const {
     307             :     //if the double-map failed we were allocated on the arena
     308           0 :     if (block.fd == -1 && block.start == block.exec && block.start != NULL)
     309           0 :         rtl_arena_free(m_arena, block.start, block.size);
     310             :     else
     311             :     {
     312           0 :         if (block.start) munmap(block.start, block.size);
     313           0 :         if (block.exec) munmap(block.exec, block.size);
     314           0 :         if (block.fd != -1) close(block.fd);
     315             :     }
     316           0 : }
     317             : #else
     318             : bool VtableFactory::createBlock(Block &block, sal_Int32 slotCount) const
     319             : {
     320             :     block.size = getBlockSize(slotCount);
     321             :     block.start = rtl_arena_alloc(m_arena, &block.size);
     322             :     return block.start != 0;
     323             : }
     324             : 
     325             : void VtableFactory::freeBlock(Block const & block) const {
     326             :     rtl_arena_free(m_arena, block.start, block.size);
     327             : }
     328             : #endif
     329             : 
     330           0 : void VtableFactory::createVtables(
     331             :     GuardedBlocks & blocks, BaseOffset const & baseOffset,
     332             :     typelib_InterfaceTypeDescription * type, bool includePrimary) const
     333             : {
     334           0 :     if (includePrimary) {
     335             :         sal_Int32 slotCount
     336           0 :             = bridges::cpp_uno::shared::getPrimaryFunctions(type);
     337             :         Block block;
     338           0 :         if (!createBlock(block, slotCount)) {
     339           0 :             throw std::bad_alloc();
     340             :         }
     341             :         try {
     342           0 :             Slot * slots = initializeBlock(block.start, slotCount);
     343             :             unsigned char * codeBegin =
     344           0 :                 reinterpret_cast< unsigned char * >(slots);
     345           0 :             unsigned char * code = codeBegin;
     346           0 :             sal_Int32 vtableOffset = blocks.size() * sizeof (Slot *);
     347           0 :             for (typelib_InterfaceTypeDescription const * type2 = type;
     348             :                  type2 != 0; type2 = type2->pBaseTypeDescription)
     349             :             {
     350             :                 code = addLocalFunctions(
     351             :                     &slots, code,
     352             : #ifdef USE_DOUBLE_MMAP
     353             :                     sal_IntPtr(block.exec) - sal_IntPtr(block.start),
     354             : #endif
     355             :                     type2,
     356             :                     baseOffset.getFunctionOffset(type2->aBase.pTypeName),
     357             :                     bridges::cpp_uno::shared::getLocalFunctions(type2),
     358           0 :                     vtableOffset);
     359             :             }
     360           0 :             flushCode(codeBegin, code);
     361             : #ifdef USE_DOUBLE_MMAP
     362             :         //Finished generating block, swap writable pointer with executable
     363             :         //pointer
     364           0 :             ::std::swap(block.start, block.exec);
     365             : #endif
     366           0 :             blocks.push_back(block);
     367           0 :         } catch (...) {
     368           0 :             freeBlock(block);
     369           0 :             throw;
     370             :         }
     371             :     }
     372           0 :     for (sal_Int32 i = 0; i < type->nBaseTypes; ++i) {
     373           0 :         createVtables(blocks, baseOffset, type->ppBaseTypes[i], i != 0);
     374             :     }
     375           0 : }
     376             : 
     377             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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