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// Copyright 2020 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// turbo-cov is a minimal re-implementation of LLVM's llvm-cov, that emits just
// the per segment coverage in a binary stream. This avoids the overhead of
// encoding to JSON.
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ProfileData/Coverage/CoverageMapping.h"
#include "llvm/ProfileData/InstrProfReader.h"
#include <cstdio>
using namespace llvm;
using namespace coverage;
namespace {
template<typename T>
void emit(T v)
{
fwrite(&v, sizeof(v), 1, stdout);
}
void emit(const llvm::StringRef &str)
{
uint64_t len = str.size();
emit<uint32_t>(len);
fwrite(str.data(), len, 1, stdout);
}
} // namespace
int main(int argc, const char **argv)
{
if(argc < 3)
{
fprintf(stderr, "turbo-cov <exe> <profdata>\n");
return 1;
}
auto exe = argv[1];
auto profdata = argv[2];
auto res = CoverageMapping::load({ exe }, profdata);
if(Error E = res.takeError())
{
fprintf(stderr, "Failed to load executable '%s': %s\n", exe, toString(std::move(E)).c_str());
return 1;
}
auto coverage = std::move(res.get());
if(!coverage)
{
fprintf(stderr, "Could not load coverage information\n");
return 1;
}
if(auto mismatched = coverage->getMismatchedCount())
{
fprintf(stderr, "%d functions have mismatched data\n", (int)mismatched);
return 1;
}
// uint32 num_files
// file[0]
// uint32 filename.length
// <data> filename.data
// uint32 num_segments
// file[0].segment[0]
// uint32 line
// uint32 col
// uint32 count
// uint8 hasCount
// file[0].segment[1]
// ...
// file[2]
// ...
auto files = coverage->getUniqueSourceFiles();
emit<uint32_t>(files.size());
for(auto &file : files)
{
emit(file);
auto fileCoverage = coverage->getCoverageForFile(file);
emit<uint32_t>(fileCoverage.end() - fileCoverage.begin());
for(auto &segment : fileCoverage)
{
emit<uint32_t>(segment.Line);
emit<uint32_t>(segment.Col);
emit<uint32_t>(segment.Count);
emit<uint8_t>(segment.HasCount ? 1 : 0);
}
}
return 0;
}