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d8b745db77
Rework the lazy function body parsing mechanism to use the request-evaluator, so that asking for the body of a function will initiate parsing. Clean up a number of callers to AbstractFunctionDecl::getBody() that don't actually need the body, so we don't perform unnecessary parsing. This change does not delay parsing of function bodies in the general case; rather, it sets up the infrastructure to always delay parsing of function bodies.
107 lines
3.6 KiB
C++
107 lines
3.6 KiB
C++
//===--- ParseRequests.cpp - Parsing Requests -----------------------------===//
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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 - 2017 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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// Lazy parsing requests
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/ParseRequests.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/DeclContext.h"
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#include "swift/AST/Module.h"
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#include "swift/Parse/Parser.h"
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#include "swift/Subsystems.h"
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using namespace swift;
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namespace swift {
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// Implement the type checker type zone (zone 10).
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#define SWIFT_TYPEID_ZONE Parse
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#define SWIFT_TYPEID_HEADER "swift/AST/ParseTypeIDZone.def"
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#include "swift/Basic/ImplementTypeIDZone.h"
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#undef SWIFT_TYPEID_ZONE
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#undef SWIFT_TYPEID_HEADER
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}
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ArrayRef<Decl *>
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ParseMembersRequest::evaluate(Evaluator &evaluator,
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IterableDeclContext *idc) const {
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SourceFile &sf = *idc->getDecl()->getDeclContext()->getParentSourceFile();
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unsigned bufferID = *sf.getBufferID();
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// Lexer diaganostics have been emitted during skipping, so we disable lexer's
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// diagnostic engine here.
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Parser parser(bufferID, sf, /*No Lexer Diags*/nullptr, nullptr, nullptr);
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// Disable libSyntax creation in the delayed parsing.
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parser.SyntaxContext->setDiscard();
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ASTContext &ctx = idc->getDecl()->getASTContext();
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return ctx.AllocateCopy(
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llvm::makeArrayRef(parser.parseDeclListDelayed(idc)));
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}
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BraceStmt *ParseAbstractFunctionBodyRequest::evaluate(
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Evaluator &evaluator, AbstractFunctionDecl *afd) const {
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using BodyKind = AbstractFunctionDecl::BodyKind;
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switch (afd->getBodyKind()) {
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case BodyKind::Deserialized:
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case BodyKind::MemberwiseInitializer:
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case BodyKind::None:
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case BodyKind::Skipped:
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return nullptr;
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case BodyKind::TypeChecked:
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case BodyKind::Parsed:
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return afd->Body;
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case BodyKind::Synthesize: {
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BraceStmt *body;
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bool isTypeChecked;
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std::tie(body, isTypeChecked) = (afd->Synthesizer.Fn)(
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afd, afd->Synthesizer.Context);
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afd->setBodyKind(isTypeChecked ? BodyKind::TypeChecked : BodyKind::Parsed);
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return body;
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}
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case BodyKind::Unparsed: {
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// FIXME: It should be fine to delay body parsing of local functions, so
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// the DelayBodyParsing should go away entirely
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// FIXME: How do we configure code completion?
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SourceFile &sf = *afd->getDeclContext()->getParentSourceFile();
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SourceManager &sourceMgr = sf.getASTContext().SourceMgr;
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unsigned bufferID = sourceMgr.findBufferContainingLoc(afd->getLoc());
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Parser parser(bufferID, sf, nullptr, nullptr, nullptr,
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/*DelayBodyParsing=*/false);
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parser.SyntaxContext->setDiscard();
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auto body = parser.parseAbstractFunctionBodyDelayed(afd);
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afd->setBodyKind(BodyKind::Parsed);
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return body;
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}
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}
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}
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// Define request evaluation functions for each of the type checker requests.
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static AbstractRequestFunction *parseRequestFunctions[] = {
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#define SWIFT_REQUEST(Zone, Name) \
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reinterpret_cast<AbstractRequestFunction *>(&Name::evaluateRequest),
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#include "swift/AST/ParseTypeIDZone.def"
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#undef SWIFT_REQUEST
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};
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void swift::registerParseRequestFunctions(Evaluator &evaluator) {
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evaluator.registerRequestFunctions(Zone::Parse,
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parseRequestFunctions);
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}
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