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//===--- CompileJobCacheKey.cpp - compile cache key methods ---------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file contains utility methods for creating compile job cache keys.
//
//===----------------------------------------------------------------------===//
#include "swift/Option/Options.h"
#include <swift/Frontend/CompileJobCacheKey.h>
#include <swift/Basic/Version.h>
#include <llvm/ADT/SmallString.h>
#include "llvm/ADT/STLExtras.h"
#include "llvm/CAS/HierarchicalTreeBuilder.h"
#include "llvm/CAS/ObjectStore.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Option/OptTable.h"
#include "llvm/Support/EndianStream.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace swift;
// TODO: Rewrite this into CASNodeSchema.
llvm::Expected<llvm::cas::ObjectRef> swift::createCompileJobBaseCacheKey(
llvm::cas::ObjectStore &CAS, ArrayRef<const char *> Args) {
// Don't count the `-frontend` in the first location since only frontend
// invocation can have a cache key.
if (Args.size() > 1 && StringRef(Args.front()) == "-frontend")
Args = Args.drop_front();
unsigned MissingIndex;
unsigned MissingCount;
std::unique_ptr<llvm::opt::OptTable> Table = createSwiftOptTable();
llvm::opt::InputArgList ParsedArgs = Table->ParseArgs(
Args, MissingIndex, MissingCount, options::FrontendOption);
SmallString<256> CommandLine;
for (auto *Arg : ParsedArgs) {
const auto &Opt = Arg->getOption();
// Skip the options that doesn't affect caching.
if (Opt.hasFlag(options::CacheInvariant))
continue;
if (Opt.hasFlag(options::ArgumentIsFileList)) {
auto FileList = llvm::MemoryBuffer::getFile(Arg->getValue());
if (!FileList)
return llvm::errorCodeToError(FileList.getError());
CommandLine.append(Opt.getRenderName());
CommandLine.push_back(0);
CommandLine.append((*FileList)->getBuffer());
CommandLine.push_back(0);
continue;
}
CommandLine.append(Arg->getAsString(ParsedArgs));
CommandLine.push_back(0);
}
llvm::cas::HierarchicalTreeBuilder Builder;
auto CMD = CAS.storeFromString(std::nullopt, CommandLine);
if (!CMD)
return CMD.takeError();
Builder.push(*CMD, llvm::cas::TreeEntry::Regular, "command-line");
// FIXME: The version is maybe insufficient...
auto Version =
CAS.storeFromString(std::nullopt, version::getSwiftFullVersion());
if (!Version)
return Version.takeError();
Builder.push(*Version, llvm::cas::TreeEntry::Regular, "version");
if (auto Out = Builder.create(CAS))
return Out->getRef();
else
return Out.takeError();
}
llvm::Expected<llvm::cas::ObjectRef>
swift::createCompileJobCacheKeyForOutput(llvm::cas::ObjectStore &CAS,
llvm::cas::ObjectRef BaseKey,
unsigned InputIndex) {
std::string InputInfo;
llvm::raw_string_ostream OS(InputInfo);
// CacheKey is the index of the producting input + the base key.
// Encode the unsigned value as little endian in the field.
llvm::support::endian::write<uint32_t>(OS, InputIndex, llvm::support::little);
return CAS.storeFromString({BaseKey}, OS.str());
}
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