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//===--- Lex.cpp - extract token stream from source code ---------*- C++-*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang-pseudo/Token.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/TokenKinds.h"
#include "clang/Lex/Lexer.h"
#include "clang/Lex/LiteralSupport.h"
namespace clang {
namespace pseudo {
TokenStream lex(const std::string &Code, const clang::LangOptions &LangOpts) {
clang::SourceLocation Start;
// Tokenize using clang's lexer in raw mode.
// std::string guarantees null-termination, which the lexer needs.
clang::Lexer Lexer(Start, LangOpts, Code.data(), Code.data(),
Code.data() + Code.size());
Lexer.SetCommentRetentionState(true);
TokenStream Result;
clang::Token CT;
// Index into the token stream of original source code.
Token::Index TokenIndex = 0;
unsigned LastOffset = 0;
unsigned Line = 0;
unsigned Indent = 0;
for (Lexer.LexFromRawLexer(CT); CT.getKind() != clang::tok::eof;
Lexer.LexFromRawLexer(CT)) {
unsigned Offset =
CT.getLocation().getRawEncoding() - Start.getRawEncoding();
Token Tok;
Tok.Data = &Code[Offset];
Tok.Length = CT.getLength();
Tok.Kind = CT.getKind();
// Update current line number and indentation from raw source code.
unsigned NewLineStart = 0;
for (unsigned I = LastOffset; I < Offset; ++I) {
if (Code[I] == '\n') {
NewLineStart = I + 1;
++Line;
}
}
if (NewLineStart || !LastOffset) {
Indent = 0;
for (char C : StringRef(Code).slice(NewLineStart, Offset)) {
if (C == ' ')
++Indent;
else if (C == '\t')
Indent += 8;
else
break;
}
}
Tok.Indent = Indent;
Tok.Line = Line;
if (CT.isAtStartOfLine())
Tok.setFlag(LexFlags::StartsPPLine);
if (CT.needsCleaning() || CT.hasUCN())
Tok.setFlag(LexFlags::NeedsCleaning);
Tok.OriginalIndex = TokenIndex++;
Result.push(Tok);
LastOffset = Offset;
}
Result.finalize();
return Result;
}
TokenStream cook(const TokenStream &Code, const LangOptions &LangOpts) {
auto CleanedStorage = std::make_shared<llvm::BumpPtrAllocator>();
clang::IdentifierTable Identifiers(LangOpts);
TokenStream Result(CleanedStorage);
Result.addPayload(Code.getPayload());
for (auto Tok : Code.tokens()) {
if (Tok.flag(LexFlags::NeedsCleaning)) {
// Remove escaped newlines and trigraphs.
llvm::SmallString<64> CleanBuffer;
const char *Pos = Tok.text().begin();
while (Pos < Tok.text().end()) {
unsigned CharSize = 0;
CleanBuffer.push_back(
clang::Lexer::getCharAndSizeNoWarn(Pos, CharSize, LangOpts));
assert(CharSize != 0 && "no progress!");
Pos += CharSize;
}
llvm::StringRef Text = CleanBuffer;
llvm::SmallString<64> UCNBuffer;
// A surface reading of the standard suggests UCNs might appear anywhere.
// But we need only decode them in raw_identifiers.
// - they cannot appear in punctuation/keyword tokens, because UCNs
// cannot encode basic characters outside of literals [lex.charset]
// - they can appear in literals, but we need not unescape them now.
// We treat them as escape sequences when evaluating the literal.
// - comments are handled similarly to literals
// This is good fortune, because expandUCNs requires its input to be a
// reasonably valid identifier (e.g. without stray backslashes).
if (Tok.Kind == tok::raw_identifier) {
clang::expandUCNs(UCNBuffer, CleanBuffer);
Text = UCNBuffer;
}
Tok.Data = Text.copy(*CleanedStorage).data();
Tok.Length = Text.size();
Tok.Flags &= ~static_cast<decltype(Tok.Flags)>(LexFlags::NeedsCleaning);
}
if (Tok.Kind == tok::raw_identifier) {
// Cook raw_identifiers into identifier, keyword, etc.
Tok.Kind = Identifiers.get(Tok.text()).getTokenID();
} else if (Tok.Kind == tok::greatergreater) {
// Split the greatergreater token.
// FIXME: split lessless token to support Cuda triple angle brackets <<<.
assert(Tok.text() == ">>");
Tok.Kind = tok::greater;
Tok.Length = 1;
Result.push(Tok);
// Line is wrong if the first greater is followed by an escaped newline!
Tok.Data = Tok.text().data() + 1;
}
Result.push(std::move(Tok));
}
Result.finalize();
return Result;
}
} // namespace pseudo
} // namespace clang
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