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09b8af86fb
Using a virutal output backend to capture all the outputs from swift-frontend invocation. This allows redirecting and/or mirroring compiler outputs to multiple location using different OutputBackend. As an example usage for the virtual outputs, teach swift compiler to check its output determinism by running the compiler invocation twice and compare the hash of all its outputs. Virtual output will be used to enable caching in the future.
125 lines
5.0 KiB
C++
125 lines
5.0 KiB
C++
//===-------- AbstractSourceFileDepGraphFactory.cpp -----------------------===//
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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 - 2018 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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#include "swift/AST/AbstractSourceFileDepGraphFactory.h"
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// may not all be needed
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#include "swift/AST/DiagnosticEngine.h"
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#include "swift/AST/DiagnosticsFrontend.h"
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#include "swift/AST/FileSystem.h"
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#include "swift/AST/FineGrainedDependencies.h"
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#include "swift/Basic/FileSystem.h"
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#include "swift/Basic/LLVM.h"
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#include "swift/Basic/ReferenceDependencyKeys.h"
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#include "llvm/ADT/MapVector.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/VirtualOutputBackend.h"
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#include "llvm/Support/YAMLParser.h"
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using namespace swift;
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using namespace fine_grained_dependencies;
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//==============================================================================
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// MARK: AbstractSourceFileDepGraphFactory - client interface
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//==============================================================================
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AbstractSourceFileDepGraphFactory::AbstractSourceFileDepGraphFactory(
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bool hadCompilationError, StringRef swiftDeps, Fingerprint fileFingerprint,
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bool emitDotFileAfterConstruction, DiagnosticEngine &diags,
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llvm::vfs::OutputBackend &backend)
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: hadCompilationError(hadCompilationError), swiftDeps(swiftDeps.str()),
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fileFingerprint(fileFingerprint),
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emitDotFileAfterConstruction(emitDotFileAfterConstruction), diags(diags),
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backend(backend) {}
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SourceFileDepGraph AbstractSourceFileDepGraphFactory::construct() {
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addSourceFileNodesToGraph();
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if (!hadCompilationError) {
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addAllDefinedDecls();
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addAllUsedDecls();
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}
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assert(g.verify());
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if (emitDotFileAfterConstruction)
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g.emitDotFile(backend, swiftDeps, diags);
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return std::move(g);
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}
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//==============================================================================
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// MARK: AbstractSourceFileDepGraphFactory - adding a defined or used Decl
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//==============================================================================
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void AbstractSourceFileDepGraphFactory::addSourceFileNodesToGraph() {
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g.findExistingNodePairOrCreateAndAddIfNew(
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DependencyKey::createKeyForWholeSourceFile(DeclAspect::interface,
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swiftDeps),
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Fingerprint{fileFingerprint});
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}
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void AbstractSourceFileDepGraphFactory::addADefinedDecl(
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const DependencyKey &interfaceKey, Optional<Fingerprint> fingerprint) {
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auto nodePair =
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g.findExistingNodePairOrCreateAndAddIfNew(interfaceKey, fingerprint);
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// Since the current type fingerprints only include tokens in the body,
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// when the interface hash changes, it is possible that the type in the
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// file has changed.
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g.addArc(g.getSourceFileNodePair().getInterface(), nodePair.getInterface());
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}
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void AbstractSourceFileDepGraphFactory::addAUsedDecl(
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const DependencyKey &defKey, const DependencyKey &useKey) {
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auto *defNode =
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g.findExistingNodeOrCreateIfNew(defKey, None, false /* = !isProvides */);
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// If the depended-upon node is defined in this file, then don't
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// create an arc to the user, when the user is the whole file.
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// Otherwise, if the defNode's type-body fingerprint changes,
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// the whole file will be marked as dirty, losing the benefit of the
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// fingerprint.
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// if (defNode->getIsProvides() &&
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// useKey.getKind() == NodeKind::sourceFileProvide)
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// return;
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// Turns out the above three lines cause miscompiles, so comment them out
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// for now. We might want them back if we can change the inputs to this
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// function to be more precise.
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// Example of a miscompile:
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// In main.swift
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// func foo(_: Any) { print("Hello Any") }
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// foo(123)
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// Then add the following line to another file:
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// func foo(_: Int) { print("Hello Int") }
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// Although main.swift needs to get recompiled, the commented-out code below
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// prevents that.
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auto nullableUse = g.findExistingNode(useKey);
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assert(nullableUse.isNonNull() && "Use must be an already-added provides");
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auto *useNode = nullableUse.get();
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assert(useNode->getIsProvides() && "Use (using node) must be a provides");
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g.addArc(defNode, useNode);
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}
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void AbstractSourceFileDepGraphFactory::addAnExternalDependency(
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const DependencyKey &defKey, const DependencyKey &useKey,
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Optional<Fingerprint> maybeFP) {
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auto *defNode = g.findExistingNodeOrCreateIfNew(defKey, maybeFP,
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false /* = !isProvides */);
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auto nullableUse = g.findExistingNode(useKey);
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assert(nullableUse.isNonNull() && "Use must be an already-added provides");
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auto *useNode = nullableUse.get();
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assert(useNode->getIsProvides() && "Use (using node) must be a provides");
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g.addArc(defNode, useNode);
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}
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