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f3ff561c6f
This is phase-1 of switching from llvm::Optional to std::optional in the
next rebranch. llvm::Optional was removed from upstream LLVM, so we need
to migrate off rather soon. On Darwin, std::optional, and llvm::Optional
have the same layout, so we don't need to be as concerned about ABI
beyond the name mangling. `llvm::Optional` is only returned from one
function in
```
getStandardTypeSubst(StringRef TypeName,
bool allowConcurrencyManglings);
```
It's the return value, so it should not impact the mangling of the
function, and the layout is the same as `std::optional`, so it should be
mostly okay. This function doesn't appear to have users, and the ABI was
already broken 2 years ago for concurrency and no one seemed to notice
so this should be "okay".
I'm doing the migration incrementally so that folks working on main can
cherry-pick back to the release/5.9 branch. Once 5.9 is done and locked
away, then we can go through and finish the replacement. Since `None`
and `Optional` show up in contexts where they are not `llvm::None` and
`llvm::Optional`, I'm preparing the work now by going through and
removing the namespace unwrapping and making the `llvm` namespace
explicit. This should make it fairly mechanical to go through and
replace llvm::Optional with std::optional, and llvm::None with
std::nullopt. It's also a change that can be brought onto the
release/5.9 with minimal impact. This should be an NFC change.
119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
//===--- ASTScriptParser.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 - 2019 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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/// AST script parsing.
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///
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//===----------------------------------------------------------------------===//
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#include "swift/Basic/QuotedString.h"
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#include "swift/Frontend/Frontend.h"
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#include "swift/Parse/Lexer.h"
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#include "swift/Parse/Token.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "ASTScript.h"
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#include "ASTScriptConfiguration.h"
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using namespace swift;
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using namespace scripting;
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namespace {
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class ASTScriptParser {
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ASTScriptConfiguration &Config;
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ASTContext &Context;
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DiagnosticEngine &Diags;
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std::unique_ptr<llvm::MemoryBuffer> Buffer;
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llvm::Optional<Lexer> TheLexer;
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Token Tok;
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public:
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ASTScriptParser(ASTScriptConfiguration &config)
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: Config(config), Context(config.Compiler.getASTContext()),
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Diags(config.Compiler.getDiags()) {
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auto &compiler = config.Compiler;
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// Open the file and give it to the source manager.
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auto bufferOrErr = llvm::MemoryBuffer::getFile(config.ScriptFile);
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if (!bufferOrErr) {
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llvm::errs() << "error opening file " << QuotedString(config.ScriptFile)
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<< ": " << bufferOrErr.getError().message() << "\n";
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return;
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}
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auto &sourceManager = compiler.getSourceMgr();
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auto bufferID = sourceManager.addNewSourceBuffer(std::move(*bufferOrErr));
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// Build and prime the lexer.
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TheLexer.emplace(Context.LangOpts, sourceManager, bufferID,
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&Diags, LexerMode::Swift);
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TheLexer->lex(Tok);
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}
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std::unique_ptr<ASTScript> parseFile() {
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if (!TheLexer) return nullptr;
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return parseTopLevel();
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}
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private:
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/***************************************************************************/
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/*** Parsing primitives ****************************************************/
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/***************************************************************************/
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void consume(tok kind) {
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assert(Tok.is(kind));
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TheLexer->lex(Tok);
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}
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bool consumeIf(tok kind) {
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if (Tok.isNot(kind)) return false;
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consume(kind);
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return true;
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}
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bool consumeIfExactly(StringRef literal) {
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if (Tok.isNot(tok::identifier) || Tok.getText() != literal)
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return false;
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consume(tok::identifier);
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return true;
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}
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bool consumeIfIdentifier(StringRef &ident) {
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if (Tok.isNot(tok::identifier)) return false;
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ident = Tok.getText();
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consume(tok::identifier);
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return true;
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}
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llvm::Optional<StringRef> consumeIfIdentifier() {
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StringRef ident;
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return consumeIfIdentifier(ident) ? llvm::Optional<StringRef>(ident) : llvm::None;
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}
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/***************************************************************************/
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/*** ASTScript parsing *****************************************************/
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/***************************************************************************/
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std::unique_ptr<ASTScript> parseTopLevel();
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};
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} // end anonymous namespace
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/// ast-script ::= ???
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std::unique_ptr<ASTScript> ASTScriptParser::parseTopLevel() {
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return std::unique_ptr<ASTScript>(new ASTScript(Config));
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}
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std::unique_ptr<ASTScript> ASTScript::parse(ASTScriptConfiguration &config) {
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return ASTScriptParser(config).parseFile();
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}
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