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8e68fab034
This reverts commit 4f059033bb. The change
is actually not NFC since previously, there is a cache in the
CompilerInvocation that prevents the same CAS from the same CASOptions
from being initialized multiple times, which was relied upon when
running inside sub invocation. When switching to a non-caching simple
CASOption types, it causes every single sub instance will create its own
CAS, and it can consume too many file descriptors and causing errors
during dependency scanning.
rdar://164903080
88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
//===--- CASOptions.h - CAS & caching options -------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the CASOptions class, which provides various
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// CAS and caching flags.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_CASOPTIONS_H
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#define SWIFT_BASIC_CASOPTIONS_H
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#include "clang/CAS/CASOptions.h"
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#include "llvm/ADT/Hashing.h"
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namespace swift {
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class CASOptions final {
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public:
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/// Enable compiler caching.
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bool EnableCaching = false;
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/// Enable compiler caching remarks.
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bool EnableCachingRemarks = false;
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/// Skip replaying outputs from cache.
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bool CacheSkipReplay = false;
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/// Import modules from CAS.
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bool ImportModuleFromCAS = false;
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/// CASOptions
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clang::CASOptions CASOpts;
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/// Clang Include Trees.
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std::string ClangIncludeTree;
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/// Clang Include Tree FileList.
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std::string ClangIncludeTreeFileList;
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/// CacheKey for input file.
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std::string InputFileKey;
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/// Cache key for imported bridging header.
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std::string BridgingHeaderPCHCacheKey;
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/// Has immutable file system input.
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bool HasImmutableFileSystem = false;
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/// Get the CAS configuration flags.
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void enumerateCASConfigurationFlags(
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llvm::function_ref<void(llvm::StringRef)> Callback) const;
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/// Check to see if a CASFileSystem is required.
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bool requireCASFS() const {
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return EnableCaching &&
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(!ClangIncludeTree.empty() || !ClangIncludeTreeFileList.empty() ||
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!InputFileKey.empty() || !BridgingHeaderPCHCacheKey.empty());
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}
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/// Return a hash code of any components from these options that should
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/// contribute to a Swift Bridging PCH hash.
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llvm::hash_code getPCHHashComponents() const {
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// The CASIDs are generated from scanner, thus not part of the hash since
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// they will always be empty when requested.
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// TODO: Add frozen clang::CASOptions to the hash.
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return llvm::hash_combine(EnableCaching);
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}
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/// Return a hash code of any components from these options that should
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/// contribute to a Swift Dependency Scanning hash.
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llvm::hash_code getModuleScanningHashComponents() const {
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return getPCHHashComponents();
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}
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};
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} // namespace swift
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#endif // SWIFT_BASIC_CASOPTIONS_H
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