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// Copyright 2011-2022, Molecular Matters GmbH <[email protected]>
// See LICENSE.txt for licensing details (2-clause BSD License: https://opensource.org/licenses/BSD-2-Clause)
#include "Examples_PCH.h"
#include "ExampleTimedScope.h"
#include "PDB_RawFile.h"
#include "PDB_DBIStream.h"
namespace
{
// we don't have to store std::string in the contributions, since all the data is memory-mapped anyway.
// we do it in this example to ensure that we don't "cheat" when reading the PDB file. memory-mapped data will only
// be faulted into the process once it's touched, so actually copying the string data makes us touch the needed data,
// giving us a real performance measurement.
struct Contribution
{
std::string objectFile;
uint32_t rva;
uint32_t size;
};
}
void ExampleContributions(const PDB::RawFile& rawPdbFile, const PDB::DBIStream& dbiStream);
void ExampleContributions(const PDB::RawFile& rawPdbFile, const PDB::DBIStream& dbiStream)
{
TimedScope total("\nRunning example \"Contributions\"");
// in order to keep the example easy to understand, we load the PDB data serially.
// note that this can be improved a lot by reading streams concurrently.
// prepare the image section stream first. it is needed for converting section + offset into an RVA
TimedScope sectionScope("Reading image section stream");
const PDB::ImageSectionStream imageSectionStream = dbiStream.CreateImageSectionStream(rawPdbFile);
sectionScope.Done();
// prepare the module info stream for matching contributions against files
TimedScope moduleScope("Reading module info stream");
const PDB::ModuleInfoStream moduleInfoStream = dbiStream.CreateModuleInfoStream(rawPdbFile);
moduleScope.Done();
// read contribution stream
TimedScope contributionScope("Reading section contribution stream");
const PDB::SectionContributionStream sectionContributionStream = dbiStream.CreateSectionContributionStream(rawPdbFile);
contributionScope.Done();
std::vector<Contribution> contributions;
{
TimedScope scope("Storing contributions");
const PDB::ArrayView<PDB::DBI::SectionContribution> sectionContributions = sectionContributionStream.GetContributions();
const size_t count = sectionContributions.GetLength();
contributions.reserve(count);
for (const PDB::DBI::SectionContribution& contribution : sectionContributions)
{
const uint32_t rva = imageSectionStream.ConvertSectionOffsetToRVA(contribution.section, contribution.offset);
if (rva == 0u)
{
printf("Contribution has invalid RVA\n");
continue;
}
const PDB::ModuleInfoStream::Module& module = moduleInfoStream.GetModule(contribution.moduleIndex);
contributions.push_back(Contribution { module.GetName().Decay(), rva, contribution.size });
}
scope.Done(count);
}
TimedScope sortScope("std::sort contributions");
std::sort(contributions.begin(), contributions.end(), [](const Contribution& lhs, const Contribution& rhs)
{
return lhs.size > rhs.size;
});
sortScope.Done();
total.Done();
// log the 20 largest contributions
{
printf("20 largest contributions:\n");
const size_t countToShow = std::min<size_t>(20ul, contributions.size());
for (size_t i = 0u; i < countToShow; ++i)
{
const Contribution& contribution = contributions[i];
printf("%zu: %u bytes from %s\n", i + 1u, contribution.size, contribution.objectFile.c_str());
}
}
}
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