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 // Copyright (c) 2010, Google Inc.

 // All rights reserved.

 //

 // Redistribution and use in source and binary forms, with or without

 // modification, are permitted provided that the following conditions are

 // met:

 //

 //     * Redistributions of source code must retain the above copyright

 // notice, this list of conditions and the following disclaimer.

 //     * Redistributions in binary form must reproduce the above

 // copyright notice, this list of conditions and the following disclaimer

 // in the documentation and/or other materials provided with the

 // distribution.

 //     * Neither the name of Google Inc. nor the names of its

 // contributors may be used to endorse or promote products derived from

 // this software without specific prior written permission.

 //

 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 //

 // module_serializer.cc: ModuleSerializer implementation.

 //

 // See module_serializer.h for documentation.

 //

 // Author: Siyang Xie (lambxsy@google.com)

 #include "processor/module_serializer.h"

 #include <map>

 #include <string>

 #include "processor/basic_code_module.h"

 #include "processor/logging.h"

 namespace google_breakpad {

 // Definition of static member variable in SimplerSerializer<Funcion>, which

 // is declared in file "simple_serializer-inl.h"

 RangeMapSerializer< MemAddr, linked_ptr<BasicSourceLineResolver::Line> >

 SimpleSerializer<BasicSourceLineResolver::Function>::range_map_serializer_;

 size_t ModuleSerializer::SizeOf(const BasicSourceLineResolver::Module &module) {

   size_t total_size_alloc_ = 0;

   // Compute memory size for each map component in Module class.

   int map_index = 0;

   map_sizes_[map_index++] = files_serializer_.SizeOf(module.files_);

   map_sizes_[map_index++] = functions_serializer_.SizeOf(module.functions_);

   map_sizes_[map_index++] = pubsym_serializer_.SizeOf(module.public_symbols_);

   for (int i = 0; i < WindowsFrameInfo::STACK_INFO_LAST; ++i)

    map_sizes_[map_index++] =

        wfi_serializer_.SizeOf(&(module.windows_frame_info_[i]));

   map_sizes_[map_index++] = cfi_init_rules_serializer_.SizeOf(

      module.cfi_initial_rules_);

   map_sizes_[map_index++] = cfi_delta_rules_serializer_.SizeOf(

      module.cfi_delta_rules_);

   // Header size.

   total_size_alloc_ = kNumberMaps_ * sizeof(uint32_t);

   for (int i = 0; i < kNumberMaps_; ++i)

    total_size_alloc_ += map_sizes_[i];

   // Extra one byte for null terminator for C-string copy safety.

   ++total_size_alloc_;

   return total_size_alloc_;

 }

 char *ModuleSerializer::Write(const BasicSourceLineResolver::Module &module,

                               char *dest) {

   // Write header.

   memcpy(dest, map_sizes_, kNumberMaps_ * sizeof(uint32_t));

   dest += kNumberMaps_ * sizeof(uint32_t);

   // Write each map.

   dest = files_serializer_.Write(module.files_, dest);

   dest = functions_serializer_.Write(module.functions_, dest);

   dest = pubsym_serializer_.Write(module.public_symbols_, dest);

   for (int i = 0; i < WindowsFrameInfo::STACK_INFO_LAST; ++i)

     dest = wfi_serializer_.Write(&(module.windows_frame_info_[i]), dest);

   dest = cfi_init_rules_serializer_.Write(module.cfi_initial_rules_, dest);

   dest = cfi_delta_rules_serializer_.Write(module.cfi_delta_rules_, dest);

   // Write a null terminator.

   dest = SimpleSerializer<char>::Write(0, dest);

   return dest;

 }

 char* ModuleSerializer::Serialize(

     const BasicSourceLineResolver::Module &module, unsigned int *size) {

   // Compute size of memory to allocate.

   unsigned int size_to_alloc = SizeOf(module);

   // Allocate memory for serialized data.

   char *serialized_data = new char[size_to_alloc];

   if (!serialized_data) {

     BPLOG(ERROR) << "ModuleSerializer: memory allocation failed, "

                  << "size to alloc: " << size_to_alloc;

     if (size) *size = 0;

     return NULL;

   }

   // Write serialized data to allocated memory chunk.

   char *end_address = Write(module, serialized_data);

   // Verify the allocated memory size is equal to the size of data been written.

   unsigned int size_written =

       static_cast<unsigned int>(end_address - serialized_data);

   if (size_to_alloc != size_written) {

     BPLOG(ERROR) << "size_to_alloc differs from size_written: "

                    << size_to_alloc << " vs " << size_written;

   }

   // Set size and return the start address of memory chunk.

   if (size)

     *size = size_to_alloc;

   return serialized_data;

 }

 bool ModuleSerializer::SerializeModuleAndLoadIntoFastResolver(

     const BasicSourceLineResolver::ModuleMap::const_iterator &iter,

     FastSourceLineResolver *fast_resolver) {

   BPLOG(INFO) << "Converting symbol " << iter->first.c_str();

   // Cast SourceLineResolverBase::Module* to BasicSourceLineResolver::Module*.

   BasicSourceLineResolver::Module* basic_module =

       dynamic_cast<BasicSourceLineResolver::Module*>(iter->second);

   unsigned int size = 0;

   scoped_array<char> symbol_data(Serialize(*basic_module, &size));

   if (!symbol_data.get()) {

     BPLOG(ERROR) << "Serialization failed for module: " << basic_module->name_;

     return false;

   }

   BPLOG(INFO) << "Serialized Symbol Size " << size;

   // Copy the data into string.

   // Must pass string to LoadModuleUsingMapBuffer(), instead of passing char* to

   // LoadModuleUsingMemoryBuffer(), becaused of data ownership/lifetime issue.

   string symbol_data_string(symbol_data.get(), size);

   symbol_data.reset();

   scoped_ptr<CodeModule> code_module(

       new BasicCodeModule(0, 0, iter->first, "", "", "", ""));

   return fast_resolver->LoadModuleUsingMapBuffer(code_module.get(),

                                                  symbol_data_string);

 }

 void ModuleSerializer::ConvertAllModules(

     const BasicSourceLineResolver *basic_resolver,

     FastSourceLineResolver *fast_resolver) {

   // Check for NULL pointer.

   if (!basic_resolver || !fast_resolver)

     return;

   // Traverse module list in basic resolver.

   BasicSourceLineResolver::ModuleMap::const_iterator iter;

   iter = basic_resolver->modules_->begin();

   for (; iter != basic_resolver->modules_->end(); ++iter)

     SerializeModuleAndLoadIntoFastResolver(iter, fast_resolver);

 }

 bool ModuleSerializer::ConvertOneModule(

     const string &moduleid,

     const BasicSourceLineResolver *basic_resolver,

     FastSourceLineResolver *fast_resolver) {

   // Check for NULL pointer.

   if (!basic_resolver || !fast_resolver)

     return false;

   BasicSourceLineResolver::ModuleMap::const_iterator iter;

   iter = basic_resolver->modules_->find(moduleid);

   if (iter == basic_resolver->modules_->end())

     return false;

   return SerializeModuleAndLoadIntoFastResolver(iter, fast_resolver);

 }

 char* ModuleSerializer::SerializeSymbolFileData(

     const string &symbol_data, unsigned int *size) {

   scoped_ptr<BasicSourceLineResolver::Module> module(

       new BasicSourceLineResolver::Module("no name"));

   scoped_array<char> buffer(new char[symbol_data.size() + 1]);

   strcpy(buffer.get(), symbol_data.c_str());

   if (!module->LoadMapFromMemory(buffer.get())) {

     return NULL;

   }

   buffer.reset(NULL);

   return Serialize(*(module.get()), size);

 }

 }  // namespace google_breakpad