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//===-- DILLexerTests.cpp --------------------------------------------===//
//
// 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 "lldb/ValueObject/DILLexer.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
#include <string>
using llvm::StringRef;
using namespace lldb_private::dil;
llvm::Expected<std::vector<std::pair<Token::Kind, std::string>>>
ExtractTokenData(llvm::StringRef input_expr) {
llvm::Expected<DILLexer> maybe_lexer = DILLexer::Create(input_expr);
if (!maybe_lexer)
return maybe_lexer.takeError();
DILLexer lexer(*maybe_lexer);
std::vector<std::pair<Token::Kind, std::string>> data;
do {
Token tok = lexer.GetCurrentToken();
data.push_back(std::make_pair(tok.GetKind(), tok.GetSpelling()));
lexer.Advance();
} while (data.back().first != Token::eof);
// Don't return the eof token.
data.pop_back();
return data;
}
TEST(DILLexerTests, SimpleTest) {
StringRef input_expr("simple_var");
llvm::Expected<DILLexer> maybe_lexer = DILLexer::Create(input_expr);
ASSERT_THAT_EXPECTED(maybe_lexer, llvm::Succeeded());
DILLexer lexer(*maybe_lexer);
Token token = lexer.GetCurrentToken();
EXPECT_EQ(token.GetKind(), Token::identifier);
EXPECT_EQ(token.GetSpelling(), "simple_var");
lexer.Advance();
token = lexer.GetCurrentToken();
EXPECT_EQ(token.GetKind(), Token::eof);
}
TEST(DILLexerTests, TokenKindTest) {
Token token = Token(Token::identifier, "ident", 0);
EXPECT_TRUE(token.Is(Token::identifier));
EXPECT_FALSE(token.Is(Token::l_paren));
EXPECT_TRUE(token.IsOneOf({Token::eof, Token::identifier}));
EXPECT_FALSE(token.IsOneOf(
{Token::l_paren, Token::r_paren, Token::coloncolon, Token::eof}));
}
TEST(DILLexerTests, LookAheadTest) {
StringRef input_expr("(anonymous namespace)::some_var");
llvm::Expected<DILLexer> maybe_lexer = DILLexer::Create(input_expr);
ASSERT_THAT_EXPECTED(maybe_lexer, llvm::Succeeded());
DILLexer lexer(*maybe_lexer);
Token token = lexer.GetCurrentToken();
// Current token is '('; check the next 4 tokens, to make
// sure they are the identifier 'anonymous', the identifier 'namespace'
// ')' and '::', in that order.
EXPECT_EQ(token.GetKind(), Token::l_paren);
EXPECT_EQ(lexer.LookAhead(1).GetKind(), Token::identifier);
EXPECT_EQ(lexer.LookAhead(1).GetSpelling(), "anonymous");
EXPECT_EQ(lexer.LookAhead(2).GetKind(), Token::identifier);
EXPECT_EQ(lexer.LookAhead(2).GetSpelling(), "namespace");
EXPECT_EQ(lexer.LookAhead(3).GetKind(), Token::r_paren);
EXPECT_EQ(lexer.LookAhead(4).GetKind(), Token::coloncolon);
// Our current index should still be 0, as we only looked ahead; we are still
// officially on the '('.
EXPECT_EQ(lexer.GetCurrentTokenIdx(), 0u);
// Accept the 'lookahead', so our current token is '::', which has the index
// 4 in our vector of tokens (which starts at zero).
lexer.Advance(4);
token = lexer.GetCurrentToken();
EXPECT_EQ(token.GetKind(), Token::coloncolon);
EXPECT_EQ(lexer.GetCurrentTokenIdx(), 4u);
lexer.Advance();
token = lexer.GetCurrentToken();
EXPECT_EQ(token.GetKind(), Token::identifier);
EXPECT_EQ(token.GetSpelling(), "some_var");
EXPECT_EQ(lexer.GetCurrentTokenIdx(), 5u);
EXPECT_EQ(token.GetLocation(), strlen("(anonymous namespace)::"));
lexer.Advance();
token = lexer.GetCurrentToken();
EXPECT_EQ(token.GetKind(), Token::eof);
}
TEST(DILLexerTests, MultiTokenLexTest) {
EXPECT_THAT_EXPECTED(
ExtractTokenData("This string has (several ) ::identifiers"),
llvm::HasValue(testing::ElementsAre(
testing::Pair(Token::identifier, "This"),
testing::Pair(Token::identifier, "string"),
testing::Pair(Token::identifier, "has"),
testing::Pair(Token::l_paren, "("),
testing::Pair(Token::identifier, "several"),
testing::Pair(Token::r_paren, ")"),
testing::Pair(Token::coloncolon, "::"),
testing::Pair(Token::identifier, "identifiers"))));
}
TEST(DILLexerTests, IdentifiersTest) {
// These strings should lex into identifier tokens.
std::vector<std::string> valid_identifiers = {
"$My_name1", "$pc", "abcd", "_", "_a", "_a_", "$",
"a_b", "this", "self", "a", "MyName", "namespace"};
// The lexer can lex these strings, but they should not be identifiers.
std::vector<std::string> invalid_identifiers = {"", "::", "(", ")", "0abc"};
// The lexer is expected to fail attempting to lex these strings (it cannot
// create valid tokens out of them).
std::vector<std::string> invalid_tok_strings = {"#include", "a@a"};
// Verify that all of the valid identifiers come out as identifier tokens.
for (auto &str : valid_identifiers) {
SCOPED_TRACE(str);
EXPECT_THAT_EXPECTED(ExtractTokenData(str),
llvm::HasValue(testing::ElementsAre(
testing::Pair(Token::identifier, str))));
}
// Verify that the lexer fails on invalid token strings.
for (auto &str : invalid_tok_strings) {
SCOPED_TRACE(str);
auto maybe_lexer = DILLexer::Create(str);
EXPECT_THAT_EXPECTED(maybe_lexer, llvm::Failed());
}
// Verify that none of the invalid identifiers come out as identifier tokens.
for (auto &str : invalid_identifiers) {
SCOPED_TRACE(str);
llvm::Expected<DILLexer> maybe_lexer = DILLexer::Create(str);
EXPECT_THAT_EXPECTED(maybe_lexer, llvm::Succeeded());
DILLexer lexer(*maybe_lexer);
Token token = lexer.GetCurrentToken();
EXPECT_TRUE(token.IsNot(Token::identifier));
EXPECT_TRUE(token.IsOneOf({Token::eof, Token::coloncolon, Token::l_paren,
Token::r_paren, Token::numeric_constant}));
}
}
TEST(DILLexerTests, NumbersTest) {
// These strings should lex into number tokens.
std::vector<std::string> valid_numbers = {"123", "0x123", "0123", "0b101"};
// The lexer can lex these strings, but they should not be numbers.
std::vector<std::string> invalid_numbers = {"", "x123", "b123"};
for (auto &str : valid_numbers) {
SCOPED_TRACE(str);
EXPECT_THAT_EXPECTED(ExtractTokenData(str),
llvm::HasValue(testing::ElementsAre(
testing::Pair(Token::numeric_constant, str))));
}
// Verify that none of the invalid numbers come out as numeric tokens.
for (auto &str : invalid_numbers) {
SCOPED_TRACE(str);
llvm::Expected<DILLexer> maybe_lexer = DILLexer::Create(str);
EXPECT_THAT_EXPECTED(maybe_lexer, llvm::Succeeded());
DILLexer lexer(*maybe_lexer);
Token token = lexer.GetCurrentToken();
EXPECT_TRUE(token.IsNot(Token::numeric_constant));
EXPECT_TRUE(token.IsOneOf({Token::eof, Token::identifier}));
}
}
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