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// Copyright (C) 2020-2023 Joel Rosdahl and other contributors
//
// See doc/AUTHORS.adoc for a complete list of contributors.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#include "ResultRetriever.hpp"
#include "Context.hpp"
#include "Depfile.hpp"
#include "Logging.hpp"
#include <Context.hpp>
#include <Stat.hpp>
#include <core/MsvcShowIncludesOutput.hpp>
#include <core/exceptions.hpp>
#include <core/wincompat.hpp>
#include <fmtmacros.hpp>
#include <util/expected.hpp>
#include <util/file.hpp>
#include <util/string.hpp>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
namespace core {
using Result::FileType;
ResultRetriever::ResultRetriever(const Context& ctx,
std::optional<Digest> result_key)
: m_ctx(ctx),
m_result_key(result_key)
{
}
void
ResultRetriever::on_embedded_file(uint8_t file_number,
FileType file_type,
nonstd::span<const uint8_t> data)
{
LOG("Reading embedded entry #{} {} ({} bytes)",
file_number,
Result::file_type_to_string(file_type),
data.size());
if (file_type == FileType::stdout_output) {
Util::send_to_fd(
m_ctx,
util::to_string_view(MsvcShowIncludesOutput::strip_includes(m_ctx, data)),
STDOUT_FILENO);
} else if (file_type == FileType::stderr_output) {
Util::send_to_fd(m_ctx, util::to_string_view(data), STDERR_FILENO);
} else {
const auto dest_path = get_dest_path(file_type);
if (dest_path.empty()) {
LOG_RAW("Not writing");
} else if (dest_path == "/dev/null") {
LOG_RAW("Not writing to /dev/null");
} else {
LOG("Writing to {}", dest_path);
if (file_type == FileType::dependency) {
write_dependency_file(dest_path, data);
} else {
util::throw_on_error<WriteError>(
util::write_file(dest_path, data),
FMT("Failed to write to {}: ", dest_path));
}
}
}
}
void
ResultRetriever::on_raw_file(uint8_t file_number,
FileType file_type,
uint64_t file_size)
{
LOG("Reading raw entry #{} {} ({} bytes)",
file_number,
Result::file_type_to_string(file_type),
file_size);
if (!m_result_key) {
throw core::Error("Raw entry for non-local result");
}
const auto raw_file_path =
m_ctx.storage.local.get_raw_file_path(*m_result_key, file_number);
const auto st = Stat::stat(raw_file_path, Stat::OnError::throw_error);
if (st.size() != file_size) {
throw core::Error(
FMT("Bad file size of {} (actual {} bytes, expected {} bytes)",
raw_file_path,
st.size(),
file_size));
}
const auto dest_path = get_dest_path(file_type);
if (!dest_path.empty()) {
try {
Util::clone_hard_link_or_copy_file(
m_ctx.config, raw_file_path, dest_path, false);
} catch (core::Error& e) {
throw WriteError(FMT("Failed to clone/link/copy {} to {}: {}",
raw_file_path,
dest_path,
e.what()));
}
// Update modification timestamp to save the file from LRU cleanup (and, if
// hard-linked, to make the object file newer than the source file).
util::set_timestamps(raw_file_path);
} else {
// Should never happen.
LOG("Did not copy {} since destination path is unknown for type {}",
raw_file_path,
static_cast<Result::UnderlyingFileTypeInt>(file_type));
}
}
std::string
ResultRetriever::get_dest_path(FileType file_type) const
{
switch (file_type) {
case FileType::object:
return m_ctx.args_info.output_obj;
case FileType::dependency:
if (m_ctx.args_info.generating_dependencies) {
return m_ctx.args_info.output_dep;
}
break;
case FileType::stdout_output:
case FileType::stderr_output:
// Should never get here.
break;
case FileType::coverage_unmangled:
if (m_ctx.args_info.generating_coverage) {
return Util::change_extension(m_ctx.args_info.output_obj, ".gcno");
}
break;
case FileType::stackusage:
if (m_ctx.args_info.generating_stackusage) {
return m_ctx.args_info.output_su;
}
break;
case FileType::diagnostic:
if (m_ctx.args_info.generating_diagnostics) {
return m_ctx.args_info.output_dia;
}
break;
case FileType::dwarf_object:
if (m_ctx.args_info.seen_split_dwarf
&& m_ctx.args_info.output_obj != "/dev/null") {
return m_ctx.args_info.output_dwo;
}
break;
case FileType::coverage_mangled:
if (m_ctx.args_info.generating_coverage) {
return Result::gcno_file_in_mangled_form(m_ctx);
}
break;
case FileType::assembler_listing:
return m_ctx.args_info.output_al;
}
return {};
}
void
ResultRetriever::write_dependency_file(const std::string& path,
nonstd::span<const uint8_t> data)
{
ASSERT(m_ctx.args_info.dependency_target);
Fd fd(open(path.c_str(), O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666));
if (!fd) {
throw WriteError(FMT("Failed to open {} for writing", path));
}
auto write_data = [&](auto d, auto s) {
util::throw_on_error<WriteError>(util::write_fd(*fd, d, s),
FMT("Failed to write to {}: ", path));
};
std::string_view str_data = util::to_string_view(data);
size_t start_pos = 0;
const size_t colon_pos = str_data.find(": ");
if (colon_pos != std::string::npos) {
const auto obj_in_dep_file = str_data.substr(0, colon_pos);
const auto& dep_target = *m_ctx.args_info.dependency_target;
if (obj_in_dep_file != dep_target) {
write_data(dep_target.data(), dep_target.length());
start_pos = colon_pos;
}
}
write_data(str_data.data() + start_pos, str_data.length() - start_pos);
}
} // namespace core
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